JPWO2014065040A1 - Multistage telescopic arm device and deep digging machine equipped with multistage telescopic arm device - Google Patents

Abstract

A telescopic arm (12) comprising an outer cylinder (13) and a plurality of stages of inner cylinders (21, 23) is provided on the tip side of the boom (4). In the outer cylinder (13), an expansion / contraction cylinder (25) is disposed and an expansion / contraction fixed sheave (31, 31 ') is fixed. The telescopic cylinder (25) is attached to the outer cylinder (13) with the rod (25B) facing upward, and moves along the outer cylinder (13) with the tube (25A) serving as a free end. The tube (25A) of the telescopic cylinder (25) is provided with a sheave attachment (30), and the sheave attachment (30) is provided with a movable sheave (33, 33 ') for expansion and contraction. The telescopic rope (34, 34 ') is wound around the telescopic fixed sheave (31, 31') and the telescopic movable sheave (33, 33 ').

Description

  The present invention relates to a multistage telescopic arm device suitably used for excavating the ground deeply, for example, in civil engineering work, and a deep excavator provided with the multistage telescopic arm device.

  Generally, when excavating a vertical shaft deep in the ground in civil engineering work, a deep excavator is preferably used. This deep digging machine includes a self-propelled vehicle body, a boom provided on the vehicle body so as to be able to move up and down, and a multistage telescopic arm device provided on the tip side of the boom. The multi-stage telescopic arm device includes a telescopic arm having an outer cylinder extending in the upward and downward directions and a multi-stage inner cylinder, a telescopic fixed sheave fixed to the outer cylinder, and a length direction of the outer cylinder. A telescopic cylinder arranged, a sheave mounting that is attached to the telescopic cylinder and moves in the longitudinal direction of the outer cylinder, a movable sheave for expansion and contraction provided on the sheave mounting, and one end side of which is locked to the outer cylinder At the same time, the other end is locked to the inner cylinder, and an intermediate portion is provided with a telescopic rope wound around the telescopic fixed sheave and the telescopic movable sheave. Furthermore, a clamshell bucket for earth and sand excavation is attached to the tip of the inner cylinder.

  This deep digging machine according to this prior art reduces the telescopic cylinder in a state where the telescopic arm provided on the tip side of the boom is held perpendicular to the ground, thereby lowering the inner cylinder of the telescopic arm downward from the outer cylinder. Elongate. Therefore, the excavator can excavate the earth and sand using the clamshell bucket attached to the tip (lower end) of the inner cylinder.

  After gripping the earth and sand excavated by the clamshell bucket, the inner cylinder is pulled up into the outer cylinder together with the clamshell bucket by the telescopic rope by extending the telescopic cylinder. In this state, the excavated earth and sand can be discharged by turning the upper swing body of the excavator toward a predetermined soil discharge position and opening the clamshell bucket (see Patent Document 1).

JP-A-62-82131

  By the way, the deep excavation machine by the prior art mentioned above attaches the tube of an expansion-contraction cylinder to the outer cylinder of an expansion-contraction arm, and the rod of an expansion-contraction cylinder protrudes downward from this tube. Therefore, the sheave attachment (hanger) that supports the movable movable sheave for expansion and contraction is attached to the lower end of the rod.

  For this reason, the deep excavator according to the prior art extends the rod of the telescopic cylinder downward and moves the sheave fitting downward when pulling up the clamshell bucket. Thus, the telescopic rope is wound between the telescopic movable sheave supported by the sheave fitting and the telescopic fixed sheave fixed to the outer cylinder, and the inner cylinder can be pulled up into the outer cylinder. .

  However, in the deep excavator according to the prior art, the tube of the expansion / contraction cylinder is attached to the outer cylinder. For this reason, the sheave fitting is moved downward by extending the rod downward from the tube of the expansion / contraction cylinder, winding the expansion / contraction rope between the expansion / contraction movable sheave and the expansion / contraction fixed sheave, and pulling the clamshell bucket. It is configured to raise. Therefore, in the prior art, when the clamshell bucket is pulled up, the weight of the sheave fixture acts on the telescopic rope, but the weight of the tube of the telescopic cylinder does not act. Thus, the deep excavator according to the prior art can use the weight of the tube of the telescopic cylinder as the lifting force when pulling the inner cylinder into the outer cylinder together with the earth and sand excavated by the clamshell bucket. Therefore, there is a problem that the inner cylinder cannot be efficiently lifted by the telescopic cylinder.

  The present invention has been made in view of the above-described problems of the prior art, and increases the pulling force of the inner cylinder by utilizing the weight of the tube of the expansion cylinder when the expansion cylinder is extended to pull up the inner cylinder. It is an object of the present invention to provide a multi-stage telescopic arm device and a deep excavator provided with the multi-stage telescopic arm device.

  (1). The present invention relates to a boom to be mounted, and an inner cylinder that is provided so as to extend upward and downward on the distal end side of the boom and that is accommodated inside the outer cylinder so as to be extendable in the length direction. A telescopic arm having a tube, a telescopic cylinder disposed along a length direction of the outer tube constituting the telescopic arm, a telescopic fixed sheave fixed to the outer tube, and the telescopic cylinder A sheave fixture that moves in the length direction of the outer cylinder so as to approach or move away from the fixed sheave for expansion and contraction, a movable sheave for expansion and contraction provided in the sheave fixture, and one end side of the sheave on the outer cylinder The telescopic rope includes a telescopic rope wound around the stationary sheave for expansion and contraction and the movable sheave for expansion and contraction. It is applied to the multistage telescopic arm device.

  A feature of the configuration adopted by the present invention is that the telescopic cylinder is constituted by a hydraulic cylinder having a tube and a rod having one side fixed to the piston in the tube and the other side projecting outward from the tube. With the rod in the upward state, the tip of the rod is attached to the outer cylinder of the telescopic arm and the tube of the telescopic cylinder is used as a free end, and the sheave fitting is attached to the tube of the telescopic cylinder.

  According to this structure, when pulling down the inner cylinder to which the excavator is attached, the rod is pulled into the tube of the telescopic cylinder to reduce the telescopic cylinder. In this state, the telescopic movable sheave supported by the sheave fixture moves upward and approaches the telescopic fixed sheave fixed to the outer cylinder. For this reason, the telescopic rope wound around the telescopic fixed sheave and the telescopic movable sheave is fed out, and the inner cylinder in which the other end of the telescopic rope is locked can be extended to the outside of the outer cylinder. it can. On the other hand, when pulling up the inner cylinder to which the excavator is attached, the rod is projected from the tube to extend the telescopic cylinder. In this state, the telescopic movable sheave supported by the sheave fixture moves downward and is separated from the telescopic fixed sheave fixed to the outer cylinder. For this reason, the telescopic rope is wound between the telescopic fixed sheave and the telescopic movable sheave, and the inner cylinder with the other end of the telescopic rope locked is pulled into the outer cylinder, so that the telescopic arm is Can be reduced.

  In this case, the rod of the telescopic cylinder faces upward, and the tip of the rod is attached to the outer cylinder. For this reason, when the telescopic cylinder is extended, the heavy tube and the sheave fitting are moved downward together via the telescopic rope wound around the telescopic movable sheave and the telescopic stationary sheave. The inner cylinder is pulled up into the outer cylinder. In this case, a downward load due to the weight of the tube and the sheave fitting acts on the tube moving downward. Therefore, the pulling force of the inner cylinder can be increased by utilizing the weight of the tube and the sheave fitting, and the pulling operation of the inner cylinder by the expansion / contraction cylinder can be performed efficiently.

  (2). According to the present invention, the tip of the rod of the telescopic cylinder is configured to be attached to the upper side of the outer cylinder.

  Thereby, the tube of the expansion / contraction cylinder to which the sheave fitting is attached can be moved upward and downward in the range of substantially the upper half of the outer cylinder extending upward and downward. For this reason, for example, even when the lower half of the outer cylinder goes underground when excavating a vertical shaft, the operator on the vehicle body side provided with the boom can visually confirm the expansion and contraction operation of the expansion cylinder, etc. The workability and safety of excavation work can be improved.

  (3). According to the present invention, on the outer side of the outer cylinder, there is provided a sheave attachment guide rail that extends in the length direction in parallel with the outer cylinder and is attached to the outer cylinder. The present invention is configured to move along the sheave fixture guide rail according to expansion and contraction.

  According to this configuration, when the sheave fixture is moved by the telescopic cylinder, the sheave fixture can always move on a fixed track by being guided by the sheave fixture guide rail. As a result, the telescopic rope wound around the telescopic fixed sheave and the telescopic movable sheave can smoothly follow the movement of the telescopic movable sheave supported by the sheave fitting, and the inner cylinder relative to the outer cylinder The stability of the expansion / contraction operation can be improved. Moreover, since the strength of the outer cylinder can be increased by the sheave fixture guide rail provided on the outer cylinder, the reliability of the entire telescopic arm can be increased.

  On the other hand, the tube to which the sheave fixture is attached can also move on a fixed track along the sheave fixture guide rail. As a result, the strength of the telescopic cylinder against buckling and lateral load can be increased, and the reliability of the telescopic cylinder can be increased.

  (4). According to the present invention, the pair of boom brackets that are attached to the outer side of the outer cylinder and below the sheave mounting tool so as to face each other in the left and right directions with a space therebetween and to be swingable on the front end side of the boom. And the tube of the telescopic cylinder is arranged in a gap formed between the pair of boom brackets.

  According to this configuration, since the telescopic cylinder is disposed in a gap formed between a pair of boom brackets provided on the outside of the outer cylinder, the telescopic cylinder, the sheave mounting unit mounted on the tube of the telescopic cylinder, and the sheave mounting The telescopic movable sheave supported by the tool, the telescopic rope wound around the telescopic fixed sheave and the telescopic movable sheave can be viewed from the vehicle body side where the boom is provided. Thus, the operator on the vehicle body side can accurately perform an operation of extending and retracting the inner cylinder with respect to the outer cylinder while directly viewing the expansion cylinder and the like.

  On the other hand, the outer cylinder has a telescopic cylinder, a telescopic fixed sheave, a sheave fixture, a telescopic movable sheave on the side opposite to the surface on which the boom bracket is provided, that is, the side opposite to the vehicle body. Etc. need not be provided. For this reason, when extending | stretching a vertical shaft etc., these expansion cylinders etc. do not contact and damage an obstruction, and can improve workability | operativity of excavation work.

  In addition, when the outer cylinder is placed on the ground in order to place the multistage telescopic arm device in the transport posture, the surface opposite to the surface attached to the boom can be placed on the ground. This prevents the weight of the telescopic arm from acting on the telescopic cylinder, sheave fitting, telescopic stationary sheave, telescopic movable sheave, etc., without using a special table or the like when placing the outer cylinder on the ground. It can be held in an upward posture.

  Therefore, when the multistage telescopic arm device is in the transport posture, maintenance work for the telescopic cylinder, the telescopic fixed sheave, the sheave mounting tool, the telescopic movable sheave attached to the outer cylinder can be performed at a position close to the ground. Therefore, the workability of this maintenance work can be improved.

  (5). According to the present invention, the outer cylinder is provided with a tube guide that movably accommodates the tube of the telescopic cylinder and guides the tube in the length direction of the outer cylinder.

  According to this structure, the tube to which the sheave mounting tool is attached can be smoothly moved by guiding the free end side of the tube of the telescopic cylinder in the length direction of the outer cylinder by the tube guide. For this reason, the tube of the expansion / contraction cylinder can move on a fixed track along the tube guide, and the strength of the expansion / contraction cylinder against buckling or lateral load can be increased. Furthermore, by housing the tube in the tube guide, the tube can be protected from falling rocks or the like during excavation.

  (6). According to the present invention, the outer cylinder includes at least a rear surface attached to the front end side of the boom, a front surface facing the rear surface in the front and rear directions, and a left side facing in the left and right directions across the rear surface and the front surface. And a right inclined surface disposed obliquely between the rear surface and the right side surface, and a right inclined surface disposed obliquely between the rear surface and the right side surface. The movable movable sheave for expansion and contraction is configured to be arranged on the outer side in the left and right directions from the left and right side surfaces constituting the outer cylinder.

  According to this configuration, the outer cylinder is formed in a cylindrical shape having a polygonal cross-sectional shape, and the left and right inclined surfaces are provided between the rear surface attached to the front end side of the boom and the left and right side surfaces. The buckling strength can be increased against the load acting on the outer cylinder. Thereby, the lifetime of an outer cylinder can be extended and the reliability of an expansion-contraction arm can be improved.

  In addition, the movable sheave for expansion and contraction supported by the sheave mounting tool is arranged on the outer side of the left and right sides of the outer cylinder so that the movable sheave for expansion and contraction is located on the rear side of the outer cylinder. It is possible to suppress a large protrusion. As a result, even when a telescopic movable sheave having a large diameter sheave can be used, the periphery of the telescopic movable sheave can be reduced in size, so that the telescopic movable sheave having a large diameter sheave can be expanded and contracted. The life of the rope can be extended.

  Thus, since it is a structure which can extend the lifetime of an expansion-contraction rope, the load which acts on an expansion-contraction rope can be set large. As a result, the capacity of the clamshell bucket attached to the inner cylinder to which the telescopic rope is connected can be increased, and a large amount of earth and sand can be excavated.

  (7). According to the present invention, the outer cylinder includes a rear surface attached to the front end side of the boom, a front surface facing the rear surface in the front and rear directions, and a left side surface facing in the left and right directions across the rear surface and the front surface. And a right side surface, a left inclined surface disposed obliquely between the rear surface and the left side surface, and a right inclined surface disposed obliquely between the rear surface and the right side surface. It is in the shape of a rectangular tube having a cross-sectional shape. Thereby, buckling strength can be raised with respect to the load which acts on an outer cylinder, and the lifetime of an outer cylinder can be extended.

  (8). According to the present invention, between the outer cylinder and the first-stage inner cylinder located on the outermost side among the plurality of inner cylinders, the first-stage inner cylinder is separated from the outer cylinder by the telescopic cylinder. A pushing mechanism that pushes the first-stage inner cylinder in the extending direction when extended; and the pushing mechanism is located on the lower side of the outer cylinder and a fixed sheave for pushing provided on the outer cylinder. The movable sheave for pushing provided on the sheave fixture at a position lower than the movable sheave for expansion and contraction, the one end side being locked to the outer cylinder and the other end side passing through the inner side of the outer cylinder. A fixed sheave for pushing is formed on the lower side of the outer cylinder, and is formed by a pushing rope wound around the pushing sheave and the pushing movable sheave. A sheave mounting opening is provided at the position where the Part of the fixed sheave is that where the structure placed inside of the outer cylinder through the sieve mounting opening.

  With this configuration, even when the diameter of the pushing fixed sheave is set large, the pushing fixing sheave can be compactly attached to the outer cylinder. As a result, it is possible to use a pushing sheave having a large diameter and to extend the life of the pushing rope.

  In addition, as compared with the configuration in which the pressing sheave for pushing is arranged at the lower end portion of the outer cylinder as in the prior art, when the first-stage inner cylinder is accommodated in the outer cylinder, it protrudes from the lower end portion of the outer cylinder. The protruding amount of the lower end portion of the first stage inner cylinder can be reduced. As a result, the total length when the telescopic arm is reduced to the minimum can be shortened. For example, when transporting a deep excavator, a compact transport posture can be achieved.

  (9). The present invention comprises a self-propelled vehicle body, a boom provided to the vehicle body so as to be able to move up and down, and a multistage telescopic arm device provided on the tip side of the boom, the multistage telescopic arm device comprising: A telescopic arm having an outer cylinder extending in the downward direction and a plurality of inner cylinders accommodated inside the outer cylinder so as to be stretchable in the length direction, and along the length direction of the outer cylinder constituting the telescopic arm A telescopic cylinder arranged; a telescopic stationary sheave fixed to the outer cylinder; and a lengthwise direction of the outer cylinder so as to approach or move away from the telescopic stationary sheave attached to the telescopic cylinder. A moving sheave fixture, a movable sheave for expansion and contraction provided on the sheave fixture, one end side locked to the outer cylinder, and the other end side locked to the innermost inner cylinder among the inner cylinders. The middle part is stretched with the expansion / contraction fixed sheave. Applied to use the movable sheave and wound on the elastic rope and depth digging excavator becomes comprise.

  The telescopic cylinder is constituted by a hydraulic cylinder having a tube and a rod having one side fixed to the piston in the tube and the other side protruding outward from the tube, and the rod of the telescopic cylinder is in an upward state. The rod tip is attached to the outer cylinder of the telescopic arm, the tube of the telescopic cylinder is a free end, and the sheave attachment is attached to the tube of the telescopic cylinder.

  According to this structure, the rod which comprises an expansion-contraction cylinder becomes upward, and the front-end | tip part of this rod is attached to the outer cylinder. For this reason, when the telescopic cylinder is extended, the heavy tube and the sheave fitting are moved downward together via the telescopic rope wound around the telescopic movable sheave and the telescopic stationary sheave. The inner cylinder is pulled up into the outer cylinder. In this case, a downward load due to the weight of the tube and the sheave fitting acts on the tube moving downward. Therefore, the pulling force of the inner cylinder can be increased by utilizing the weight of the tube and the sheave fitting, and the pulling operation of the inner cylinder by the expansion / contraction cylinder can be performed efficiently.

It is a side view which shows the deep excavation machine by embodiment of this invention in the state which the expansion-contraction arm reduced most. It is a side view which shows a deep excavation machine in the state which the expansion-contraction arm extended most. It is a side view which shows the multistage expansion-contraction arm apparatus in FIG. It is the front view which looked at the multistage expansion-contraction arm apparatus from the arrow IV-IV direction in FIG. It is a perspective view which shows a multistage telescopic arm apparatus alone. FIG. 6 is an enlarged perspective view of main parts showing the outer cylinder, the telescopic cylinder, the telescopic fixed sheave, the sheave mounting tool, the telescopic movable sheave, the sheave mounting guide rail, and the like in FIG. 5. It is a perspective view of the principal part expansion which shows a sheave attaching tool, a movable sheave for expansion and contraction, a movable sheave for pushing, a sheave attaching tool guide rail, and the like. It is a front view of the principal part expansion which expands and shows the fixed sheave for expansion-contraction in FIG. It is a schematic diagram which shows the expansion-contraction mechanism of an expansion-contraction arm in the state which the expansion-contraction arm contracted. It is a schematic diagram which shows the expansion-contraction mechanism of an expansion-contraction arm in the state which the expansion-contraction arm extended. It is sectional drawing which looked at the expansion-contraction arm, the boom bracket, etc. from the arrow XI-XI direction in FIG. FIG. 4 is a cross-sectional view of the telescopic arm, the telescopic cylinder, the sheave mounting tool, the telescopic movable sheave, etc., as viewed from the direction of arrows XII-XII in FIG. FIG. 4 is a cross-sectional view of the telescopic arm, the telescopic cylinder, the sheave mounting tool, the pushable movable sheave, and the like when viewed from the direction of arrows XIII-XIII in FIG. 3. It is sectional drawing which looked at the expansion-contraction arm, sheave attachment opening, the fixed sheave for pushing, etc. from the arrow XIV-XIV direction in FIG. It is a side view which shows the state which put the expansion-contraction arm on the ground with the deep excavator as a transport posture. It is a front view which shows the modification which has arrange | positioned the expansion-contraction cylinder, the expansion and contraction fixed sheave, the sheave attachment, the expansion and contraction movable sheave, the sheave attachment guide rail and the like on the front side of the outer cylinder.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a deep excavator according to the present invention will be described in detail with reference to the accompanying drawings.

  In FIG. 1, reference numeral 1 denotes a deep excavator according to the present embodiment. The deep excavator 1 is mounted on a crawler type lower traveling body 2 capable of self-propelling and capable of turning on the lower traveling body 2. And a vehicle body made up of the upper revolving body 3. This vehicle body is an attachment target of the multistage telescopic arm device 11 described later.

  The upper swing body 3 includes a swing frame 3A as a base, a cab 3B disposed on the front left side of the swing frame 3A, a counterweight 3C provided on the rear end side of the swing frame 3A, and an engine inside. , And a building cover 3D that accommodates equipment (not shown) such as a hydraulic pump.

  Reference numeral 4 denotes a boom provided on the front side of the upper swing body 3 so as to be able to move up and down. The base end side of the boom 4 is attached to the front side of the revolving frame 3 </ b> A, and a multistage telescopic arm device 11 described later is attached to the tip end side of the boom 4. A boom cylinder 4A is provided between the boom 4 and the swing frame 3A, and the boom 4 moves up and down with respect to the upper swing body 3 by expanding and contracting the boom cylinder 4A. The bottom side of the excavator swing cylinder 4B is attached to the upper surface side of the boom 4, and the rod side of the excavator swing cylinder 4B is attached to the multistage telescopic arm device 11.

  Next, the multistage telescopic arm device 11 attached to the tip end side of the boom 4 and excavating a vertical shaft deep in the ground will be described.

  Reference numeral 11 denotes a multi-stage telescopic arm device attached to the distal end side of the boom 4, and the multi-stage telescopic arm device 11 includes a telescopic arm 12, a telescopic cylinder 25, a sheave mounting tool 30, and a telescopic fixed sheave 31. The movable sheave 33 for expansion and contraction and the rope 34 for expansion and contraction are provided.

  Reference numeral 12 denotes a telescopic telescopic arm attached to the front end side of the boom 4 so as to extend upward and downward. As shown in FIG. 9 and the like, the telescopic arm 12 includes an outer cylinder 13 positioned on the outermost side and a later-described first stage accommodated in the lengthwise direction on the inner peripheral side of the outer cylinder 13 (movable). An inner cylinder 21 of the eye and a second-stage inner cylinder 23 (described later) housed on the inner peripheral side of the first-stage inner cylinder 21 so as to be extendable in the length direction.

  Here, as shown in FIGS. 11 to 14, the outer cylinder 13 includes a rear surface 13A attached to the front end side of the boom 4, a front surface 13B facing the rear surface 13A with a distance in the front and rear directions, the rear surface 13A and the front surface. A left side 13C and a right side 13D facing in the left and right directions across 13B, a left inclined surface 13E disposed obliquely between the rear surface 13A and the left side 13C, a rear surface 13A and a right side 13D Between the right inclined surface 13F and the right inclined surface 13F. Therefore, the outer cylinder 13 is formed as a square cylinder having a hexagonal cross-sectional shape as a whole.

  Thus, the outer cylinder 13 is provided with the left inclined surface 13E between the rear surface 13A and the left side surface 13C attached to the front end side of the boom 4, and the right inclined surface 13F is provided between the rear surface 13A and the right side surface 13D. It has been. Thereby, the outer cylinder 13 becomes a structure which can raise the buckling strength with respect to the load which acts on the said outer cylinder 13. FIG. On the other hand, the upper end portion 13G and the lower end portion 13H of the outer cylinder 13 are open ends.

  The upper flange plate 14 is located at an intermediate portion in the length direction of the outer cylinder 13 and is integrally provided on the outer peripheral side of the outer cylinder 13. One end 42 </ b> A of a pushing rope 42 described later is locked to the upper flange plate 14. On the other hand, the lower flange plate 15 is integrally provided at the lower end portion of the outer cylinder 13. One end 37 </ b> A of a support rope 37 described later is locked to the lower flange plate 15.

  On the lower side of the outer cylinder 13, left and right sheave mounting openings 16, 16 'are provided. As shown in FIG. 14, the left sheave mounting opening 16 is formed at a portion where the left side surface 13 </ b> C and the left inclined surface 13 </ b> E constituting the outer cylinder 13 intersect, and the right sheave mounting opening 16 ′ is the right side of the outer cylinder 13. It is formed at a portion where the surface 13D and the right inclined surface 13F intersect. The sheave mounting openings 16 and 16 'open inside the outer cylinder 13, and a part of the pressing fixed sheaves 39 and 39' to be described later is inserted into the sheave mounting openings 16 and 16 '.

  17 is a pair of left and right boom brackets provided on the outer side of the outer cylinder 13 and below the sheave fixture 30 described later. The pair of boom brackets 17 are attached to the tip side of the boom 4. It is what Here, as shown in FIGS. 5 and 11, the pair of boom brackets 17 are formed of plates facing each other in the left and right directions, and each bracket 17 has a left and a right side of the cylindrical boom connecting portion 17A. Both sides in the right direction are fixed. The pair of boom brackets 17 are integrally fixed to the rear surface 13A of the outer cylinder 13 by means of welding or the like, and the boom connecting portion 17A of the boom bracket 17 is attached to the boom 4 using a pin 18 (see FIG. 1). Pin connected to the tip side. Further, a gap 17B is formed between the pair of boom brackets 17, and a telescopic cylinder 25 described later is arranged in the gap 17B.

  Reference numeral 19 denotes a pair of left and right cylinder brackets positioned on the upper side of the boom bracket 17 and provided outside the outer cylinder 13. The pair of cylinder brackets 19 are attached to the rod side of the excavator swing cylinder 4B. It is Here, the pair of cylinder brackets 19 are made of plates facing each other in the left and right directions, and include a cylinder connecting portion to which the rod tip of the excavator swing cylinder 4B is connected. The pair of cylinder brackets 19 is integrally fixed to a position near the upper side of the boom bracket 17 on the rear surface 13A of the outer cylinder 13 by means of welding or the like. The rod tip of the excavator swing cylinder 4B is pin-coupled so as to be rotatable using a pin 20 (see FIG. 1).

  Therefore, by extending and retracting the excavator swing cylinder 4B, the outer cylinder 13 of the extendable arm 12 swings forward, backward, upward, and downward about the pin 18 on the tip side of the boom 4. ing. The cylinder bracket 19 may be provided below the boom bracket 17 depending on the mounting position of the excavator swing cylinder 4B.

  Reference numeral 21 denotes a first-stage inner cylinder positioned on the outermost side and movably accommodated inside the outer cylinder 13 with a moderate gap. As shown in FIGS. 11 to 14, the first-stage inner cylinder 21 has a quadrangular cross-sectional shape surrounded by a rear surface 21A, a front surface 21B, a left side surface 21C, and a right side surface 21D. The inner cylinder 21 is formed as a square cylinder as a whole, and both upper and lower ends are open ends. Furthermore, the inner cylinder 21 is accommodated inside the outer cylinder 13 from the lower end portion 13H of the outer cylinder 13, and is movable in the length direction (upward and downward) with respect to the outer cylinder 13.

  Here, a slide plate (not shown) for smoothly sliding the inner cylinder 21 along the outer cylinder 13 between the inner surface of the outer cylinder 13 and the outer surface of the first-stage inner cylinder 21. Is provided. On the other hand, a lower flange plate 22 is provided at the lower end portion of the inner cylinder 21, and a supporting fixed sheave 35 to be described later is attached to the lower flange plate 22.

  Reference numeral 23 denotes the innermost second-stage inner cylinder accommodated inside the first-stage inner cylinder 21 so as to be movable with an appropriate gap. The inner cylinder 23 is surrounded by a rear surface 23A, a front surface 23B, a left side surface 23C, and a right side surface 23D. The second-stage inner cylinder 23 is formed as a rectangular cylinder having a square cross-sectional shape that is slightly smaller than the first-stage inner cylinder 21. The second-stage inner cylinder 23 is housed inside the inner cylinder 21 from the lower end side of the first-stage inner cylinder 21 and is movable in the length direction (upward and downward) with respect to the inner cylinder 21. Yes.

  Here, a slide plate for smoothly sliding the inner cylinder 23 along the inner cylinder 21 between the inner surface of the first-stage inner cylinder 21 and the outer surface of the second-stage inner cylinder 23. (Not shown) is provided. On the other hand, a mounting eye 24 is provided at the lower end portion of the inner cylinder 23, and a clamshell bucket 43 described later is mounted on the mounting eye 24.

  Next, the telescopic cylinder 25 according to the present embodiment, the tube guide 26 attached to the telescopic cylinder 25, the sheave mounting guide rail 28, the sheave mounting 30 and the like will be described.

  Reference numeral 25 denotes a telescopic cylinder disposed along the length direction of the outer cylinder 13 constituting the telescopic arm 12, and the telescopic cylinder 25 is a hydraulic cylinder that expands and contracts by supplying and discharging pressure oil. The telescopic cylinder 25 includes a tube 25A, a piston (not shown) slidably provided in the tube 25A, and a rod having one side fixed to the piston within the tube 25A and the other side protruding outward from the tube 25A. 25B.

  Here, the telescopic cylinder 25 is disposed on the rear surface 13A side of the outer cylinder 13 provided with the boom bracket 17 and at the center position in the left and right directions of the outer cylinder 13 with the rod 25B facing upward. . As shown in FIG. 8, the tip 25C of the rod 25B of the telescopic cylinder 25 is pin-coupled via a pin 25D to a bracket 13J provided in the vicinity of the upper end 13G of the outer cylinder 13.

  On the other hand, the tube 25A of the telescopic cylinder 25 extends downward as a free end and is disposed in a gap 17B formed between the boom brackets 17 paired in the left and right directions. Further, a sheave mounting tool 30 to be described later is mounted on the upper side of the tube 25A. Accordingly, the tube 25A is moved along the outer cylinder 13 together with the sheave fitting 30 by expanding and contracting the telescopic cylinder 25 between the most extended state shown in FIG. 1 and the most contracted state shown in FIG. , It is configured to move downward.

  Here, when the telescopic cylinder 25 is in the most contracted state shown in FIG. 2, the length dimension from the bottom 25A1 of the tube 25A to the tip 25C (position of the pin 25D) of the rod 25B (the telescopic cylinder 25 in the most contracted state). L1), the length from the vicinity 13G1 of the outer cylinder 13 near the upper end (the position of the pin 25D where the rod 25B is connected to the outer cylinder 13) to the lower end 13H (the length of the outer cylinder 13). ) Is L2, the length dimension L1 of the telescopic cylinder 25 in the most contracted state is set to be approximately ½ the length dimension L2 of the outer cylinder 13.

  That is, the length dimension L1 of the telescopic cylinder 25 in the most contracted state and the length dimension L2 of the outer cylinder 13 are set in the following relationship.

  More preferably, the length dimension L1 of the telescopic cylinder 25 in the most contracted state and the length dimension L2 of the outer cylinder 13 are set to have the following relationship.

  Thus, by setting the length dimension L1 of the telescopic cylinder 25 in the most contracted state to a length dimension that is substantially ½ of the length dimension L2 of the outer cylinder 13, a large stroke of the telescopic cylinder 25 is ensured. be able to. As a result, the telescopic rope 34 is simply hung four times between the two fixed sheaves 31A and 31B of the telescopic fixed sheave 31 described later and the two movable sheaves 33A and 33B of the telescopic movable sheave 33. The telescopic arm 12 can be expanded and contracted between the most contracted state shown in FIG. 1 and the most expanded state shown in FIG.

  Reference numeral 26 denotes a tube guide provided outside the rear surface 13A of the outer cylinder 13. The tube guide 26 accommodates the tube 25A of the telescopic cylinder 25 in a movable manner. As shown in FIGS. 12 and 13, the tube guide 26 is formed by a rectangular tube having a substantially square cross-sectional shape. The tube guide 26 is disposed in a gap 17B formed between the pair of boom brackets 17, and is fixed to the rear surface 13A of the outer cylinder 13 along the length direction thereof. Accordingly, the tube 25 </ b> A of the telescopic cylinder 25 that has become a free end can move in the length direction of the outer cylinder 13 while being guided by the tube guide 26.

  A slide plate 27 is provided on the outer surface on the bottom side of the tube 25 </ b> A of the telescopic cylinder 25. The tube 25 </ b> A of the telescopic cylinder 25 is fitted on the inner peripheral side of the tube guide 26, and the slide plate 27 moves along the inner side surface of the tube guide 26. Thereby, the tube 25 </ b> A can smoothly move in the length direction of the outer cylinder 13 along the tube guide 26.

  Reference numeral 28 denotes two sheave attachment guide rails provided on the outer side of the outer cylinder 13. Each sheave attachment guide rail 28 guides a sheave attachment 30 described later. These two sheave attachment guide rails 28 are arranged one by one on the left and right with the telescopic cylinder 25 sandwiched between the rear surface 13A of the outer cylinder 13.

  Here, the sheave fixture guide rail 28 is formed of a rectangular tube having a rectangular cross-sectional shape. The upper end portion of the sheave fixture guide rail 28 is fixed in the vicinity of the upper end portion 13G of the outer cylinder 13 via a bracket 28A, and the lower end portion of the sheave fixture guide rail 28 is in the vicinity of the upper flange plate 14 of the outer cylinder 13. It is fixed via a bracket 28B. As a result, the sheave fixture guide rail 28 extends in the length direction in parallel with the rear surface 13A in a state in which a predetermined interval is formed between the sheave fixture guide rail 28 and the rear surface 13A of the outer cylinder 13. In this case, the strength of the outer cylinder 13 can be increased by fixing the two sheave attachment guide rails 28 made of a rectangular cylinder to the outer cylinder 13.

  Reference numeral 29 denotes a sheave mounting board fixedly provided on the upper end portion 13G of the outer cylinder 13, and the sheave mounting board 29 is used to mount telescopic fixing sheaves 31 and 31 'to be described later. Here, the sheave mounting board 29 includes a sheave mounting portion 29A that projects from the rear surface 13A of the outer cylinder 13 to the rear side (the boom 4 side), and a rope locking portion 29B that is positioned on the front side of the sheave mounting portion 29A. Have. Fixed sheaves 31 and 31 'for expansion and contraction are rotatably supported by the sheave mounting portion 29A of the sheave mounting substrate 29, and one ends 34A and 34A' of expansion and contraction ropes 34 and 34 'to be described later are supported by the rope locking portion 29B. Is locked.

  Reference numeral 30 denotes a sheave mounting tool attached to the tube 25A of the telescopic cylinder 25. The sheave mounting tool 30 is provided with telescopic movable sheaves 33 and 33 'and push-in movable sheaves 41 and 41' to be described later. . Here, as shown in FIGS. 7, 12, and 13, the sheave attachment 30 is located on the upper side of the main body 30 </ b> A, the main body 30 </ b> A fixed to the upper side of the tube 25 </ b> A of the telescopic cylinder 25, An upper sheave support portion 30B that rotatably supports the movable sheaves 33 and 33 'for expansion and contraction, and a lower sheave that is positioned on the lower side of the main body portion 30A and that rotatably supports the movable sheaves 41 and 41' for pushing described later. It is comprised by the support part 30C. The main body portion 30 </ b> A of the sheave fixture 30 is bent in a mountain shape so as to avoid the tube guide 26.

  On the other hand, as shown in FIG. 12, the left and right guide insertion portions 30D in the shape of a rectangular tube into which the left and right sheave attachment guide rails 28 are slidably inserted into the main body portion 30A of the sheave attachment 30. The sheave fixture 30 is movable in the length direction (up and down) of the outer cylinder 13 while being guided by the left and right sheave fixture guide rails 28.

  Next, a configuration for connecting the outer cylinder 13 constituting the telescopic arm 12, the first-stage inner cylinder 21 and the second-stage inner cylinder 23 in a telescopic manner, that is, the telescopic fixed sheaves 31, 31 ', the telescopic arm The movable sheaves 33 and 33 ', the telescopic ropes 34 and 34', the supporting fixed sheaves 35 and 35 ', and the supporting ropes 37 and 37' will be described.

  Here, the telescopic fixed sheaves 31, 31 ′, the telescopic movable sheaves 33, 33 ′, the telescopic ropes 34, 34 ′, the supporting stationary sheaves 35, 35 ′, and the supporting ropes 37, 37 ′ are the outer cylinder 13. On the other hand, they are provided so as to be symmetric with respect to the left and right with the telescopic cylinder 25 interposed therebetween, and have the same structure. Therefore, hereinafter, the telescopic fixed sheave 31, the telescopic movable sheave 33, the telescopic rope 34, the supporting fixed sheave 35, and the supporting rope 37 disposed on the left side of the outer cylinder 13 will be described and disposed on the right side. For the components, a dash “′” is added to the reference numerals of corresponding components, and the description thereof is omitted.

  Reference numeral 31 denotes a telescopic fixed sheave fixed to the upper end side of the outer cylinder 13 via a sheave mounting substrate 29. The telescopic fixed sheave 31 is composed of two fixed sheaves 31A and 31B having the same diameter. Yes. As shown in FIG. 8, one fixed sheave 31A is rotatably supported by one bracket 32A among the brackets 32 provided on the sheave mounting portion 29A of the sheave mounting substrate 29, and the other fixed sheave 31B The bracket 32B is rotatably supported. In this case, the support shafts (not shown) of the fixed sheaves 31A and 31B are arranged so as to be non-parallel to the rear surface 13A of the outer cylinder 13, respectively.

  Reference numeral 33 denotes a telescopic movable sheave that is rotatably supported by the sheave fixture 30. The telescopic movable sheave 33 is composed of two movable sheaves 33A and 33B having the same diameter. Here, as shown in FIG. 12, one movable sheave 33A and the other movable sheave 33B are rotatable adjacent to one support shaft 33C attached to the upper sheave support portion 30B of the sheave fixture 30. It is supported by. In this case, the support shafts 33C of the movable sheaves 33A and 33B are arranged in parallel to the rear surface 13A of the outer cylinder 13. The movable sheave 33 for expansion and contraction approaches or separates from the fixed sheave 31 for expansion and contraction when the sheave mounting tool 30 moves upward and downward according to the expansion and contraction of the expansion cylinder 25.

  The telescopic movable sheave 33 supported by the sheave fixture 30 is disposed outside the left side surface 13C of the outer cylinder 13, and faces the left side surface 13C in the left and right directions with a slight gap. Thereby, the telescopic movable sheave 33 can be prevented from projecting greatly toward the rear surface 13A of the outer cylinder 13, and the periphery of the telescopic movable sheave 33 can be reduced in size.

  Reference numeral 34 denotes an expansion / contraction rope that connects the outer cylinder 13 and the innermost second-stage inner cylinder 23, and the expansion / contraction rope 34 is constituted by a wire rope. Here, as shown in FIGS. 9 and 10, one end 34 </ b> A of the telescopic rope 34 is engaged with the rope engaging portion 29 </ b> B of the sheave mounting substrate 29 provided on the upper end portion 13 </ b> G of the outer cylinder 13. The other end 34 </ b> B of the rope 34 is locked to the upper side of the second-stage inner cylinder 23. The middle part of the telescopic rope 34 is 4 between the two fixed sheaves 31A and 31B constituting the telescopic fixed sheave 31 and the two movable sheaves 33A and 33B constituting the telescopic movable sheave 33. It has been spun around.

  That is, one end 34 </ b> A of the telescopic rope 34 is locked to the sheave mounting substrate 29, and an intermediate portion of the telescopic rope 34 is fixed to one movable sheave 33 </ b> A of the telescopic movable sheave 33 and one of the telescopic fixed sheave 31. The sheave 31A, the other movable sheave 33B of the telescopic movable sheave 33, and the other fixed sheave 31B of the telescopic fixed sheave 31 are wound around one by one. Further, the telescopic rope 34 is inserted from the other fixed sheave 31B of the telescopic fixed sheave 31 into the outer cylinder 13 and the first stage inner cylinder 21, and the other end 34B of the telescopic rope 34 has two stages. Locked to the upper side of the inner cylinder 23 of the eye.

  Thus, the expansion / contraction fixed sheave 31 is constituted by the two fixed sheaves 31A and 31B, and the expansion / contraction movable sheave 33 is constituted by the two movable sheaves 33A and 33B. On this, the telescopic rope 34 is wound around the two fixed sheaves 31A and 31B and the two movable sheaves 33A and 33B for a total of four times. As a result, for example, as in the prior art, the rope for expansion and contraction is expanded and contracted compared to the configuration in which the four sheaves of the fixed sheave for expansion and contraction and the four sheaves of the movable sheave for expansion and contraction are totaled eight times. In this configuration, the number of times that the rope 34 contacts the sheave can be halved.

  Reference numeral 35 denotes one supporting fixed sheave provided on the lower flange plate 22 of the first stage inner cylinder 21. The supporting fixed sheave 35 is rotatably supported by a bracket 36 fixed to the lower flange plate 22 of the inner cylinder 21.

  Reference numeral 37 denotes a support rope for supporting the inner cylinder 21 between the outer cylinder 13 and the inner cylinder 23, and the support rope 37 is constituted by a wire rope. Here, as shown in FIGS. 9 and 10, one end 37 </ b> A of the support rope 37 is locked to the lower flange plate 15 of the outer cylinder 13, and an intermediate portion of the support rope 37 is attached to the support fixed sheave 35. It is wound. Further, the support rope 37 is inserted into the first stage inner cylinder 21 from the support fixed sheave 35, and the other end 37 </ b> B of the support rope 37 is locked to the upper side of the second stage inner cylinder 23. Has been.

  Next, pushing mechanisms 38 and 38 'that push the first-stage inner cylinder 21 in the extending direction when the inner cylinder 21 is extended from the outer cylinder 13 by the telescopic cylinder 25 will be described.

  That is, left and right pushing mechanisms 38 and 38 ′ are provided between the outer cylinder 13 and the first-stage inner cylinder 21. Each pushing mechanism 38, 38 ′ holds the inner cylinder 21 in the extended state when the inner cylinder 21 is extended from the outer cylinder 13 by the telescopic cylinder 25.

  Here, as shown in FIGS. 13 and 14, the pushing mechanisms 38 and 38 'are composed of pushing fixed sheaves 39 and 39', pushing movable sheaves 41 and 41 ', and pushing ropes 42 and 42'. It is configured. Each push-in mechanism 38, 38 'is provided so as to be left and right symmetrical with respect to the outer cylinder 13 with the telescopic cylinder 25 interposed therebetween, and has the same structure. For this reason, hereinafter, the pushing mechanism 38 disposed on the left side of the outer cylinder 13 will be described, and those disposed on the right side will be given a dash “′” to the reference numerals of the corresponding components, and the description thereof will be omitted. .

  Reference numeral 39 denotes a single pressing fixed sheave provided on the lower side of the outer cylinder 13. As shown in FIG. 14, the pressing fixed sheave 39 is rotatably supported by a bracket 40 fixed to the outer cylinder 13 across the sheave mounting opening 16 formed in the outer cylinder 13 via a support shaft 39A. ing. In this case, the support shaft 39A of the pushing-in fixed sheave 39 is disposed with an inclination angle of an angle θ smaller than 90 degrees with respect to the left side surface 13C of the outer cylinder 13. That is, the support shaft 39A of the pushing fixed sheave 39 is arranged non-parallel to the rear surface 13A of the outer cylinder 13, and a part of the pushing fixed sheave 39 supported by the support shaft 39A is part of the outer cylinder 13. It is housed inside.

  Reference numeral 41 denotes one pushable movable sheave provided on the sheave fixture 30 at a position below the movable movable sheave 33 for expansion and contraction. As shown in FIG. 13, the pushable movable sheave 41 is rotatably supported by the lower sheave support portion 30C of the sheave fixture 30 via a support shaft 41A. In this case, the support shaft 41 </ b> A of the pushing movable sheave 41 is disposed in parallel to the rear surface 13 </ b> A of the outer cylinder 13. The movable sheave 41 for pushing approaches or moves away from the fixed sheave 39 for pushing as the sheave mounting tool 30 moves upward and downward according to the expansion and contraction of the telescopic cylinder 25.

  Reference numeral 42 denotes a pushing rope for connecting the outer cylinder 13 and the first-stage inner cylinder 21. The pushing rope 42 is constituted by a wire rope. Here, as shown in FIGS. 9 and 10, one end 42 </ b> A of the pushing rope 42 is locked to the upper flange plate 14 of the outer cylinder 13, and a midway portion of the pushing rope 42 is connected to the pushing movable sheave 41. It is wound around a pressing fixed sheave 39. Further, the other end 42 </ b> B of the pushing rope 42 is inserted into the outer cylinder 13 from the pushing fixed sheave 39 and is locked to the upper side of the inner cylinder 21 inside the outer cylinder 13.

  Therefore, when the telescopic cylinder 25 is contracted from the most extended state shown in FIGS. 1 and 9 to the state shown in FIG. 10, the tube 25A of the telescopic cylinder 25 moves upward together with the sheave attachment 30, The telescopic movable sheave 33 approaches the telescopic fixed sheave 31. As a result, the telescopic rope 34 wound around the telescopic movable sheave 33 and the telescopic fixed sheave 31 is fed out, and the second-stage inner cylinder 23 extends downward from the outer cylinder 13 by its own weight. At this time, the other end 37B of the support rope 37 locked to the upper side of the inner cylinder 23 moves downward together with the second-stage inner cylinder 23. The cylinder 21 also extends downward from the outer cylinder 13 by its own weight. Thus, as shown in FIGS. 2 and 10, when the tube 25A moves to the upper limit position and the telescopic cylinder 25 reaches the minimum contracted state, the telescopic arm 12 is in the maximum extended state.

  Here, when the sheave fixture 30 approaches the telescopic fixed sheave 31, the pushing rope 42 is wound between the pushing movable sheave 41 and the pushing fixed sheave 39, and the other end 42B of the pushing rope 42 is The first stage inner cylinder 21 moves downward. Thereby, the pushing rope 42 always maintains a constant tension. Further, since the inner cylinder 21 extends while being supported by the support rope 37, the support rope 37 always maintains a constant tension.

  Therefore, when an upward excavation reaction force acts on the inner cylinders 21 and 23 by performing excavation work using the clamshell bucket 43 described later in a state where the inner cylinders 21 and 23 extend from the outer cylinder 13. However, it is possible to prevent the inner cylinders 21 and 23 from moving to the reduction side due to the tension of the pushing rope 42 and the supporting rope 37.

  Next, when the expansion / contraction cylinder 25 is extended from the most contracted state shown in FIGS. 2 and 10, the tube 25 </ b> A of the expansion / contraction cylinder 25 moves downward together with the sheave attachment 30, and the expansion / contraction movable sheave 33. Is spaced from the telescopic fixed sheave 31. As a result, the telescopic rope 34 is wound up between the telescopic movable sheave 33 and the telescopic fixed sheave 31, and the second inner cylinder 23 moves upward and is accommodated in the first inner cylinder 21. It will be done. At this time, since the other end 37B of the support rope 37 locked to the upper side of the inner cylinder 23 moves upward together with the inner cylinder 23, the first-stage inner cylinder 21 supported by the support rope 37 is also upward. To be accommodated in the outer cylinder 13. Thus, as shown in FIGS. 1 and 9, when the tube 25A moves to the lower limit position and the telescopic cylinder 25 reaches the maximum extended state, the telescopic arm 12 is in the minimum contracted state.

  On the other hand, when the telescopic arm 12 expands and contracts between the most contracted state and the most extended state, the telescopic fixed sheave 31 ′, the telescopic movable sheave 33 ′, and the telescopic rope 34 arranged on the right side with the telescopic cylinder 25 interposed therebetween. ', The supporting fixed sheave 35', the supporting rope 37 ', and the pressing fixed sheave 39' constituting the pressing mechanism 38 ', the pressing movable sheave 41', and the pressing rope 42 'operate in the same manner as described above. Is.

  Here, as shown in FIGS. 13 and 14, the outer cylinder 13 has a hexagonal cross-sectional shape surrounded by a rear surface 13A, a front surface 13B, a left side surface 13C, a right side surface 13D, a left inclined surface 13E, and a right inclined surface 13F. The pushing movable sheave 41 is disposed at a position facing the left inclined surface 13E in the left and right directions. For this reason, as shown by the arrow X in FIG. 13, the pushing movable sheave 41 can be disposed close to the left inclined surface 13E. Preferably, the movable movable sheave 41 for pushing is provided at the same position as the left side surface 13C or at a more inner position. In this manner, by moving the pushing movable sheave 41 closer to the left inclined surface 13E of the outer cylinder 13, it is possible to prevent the pushing movable sheave 41 from protruding to the left and right directions with respect to the left side surface 13C of the outer cylinder 13. Further, it is possible to suppress the protrusion in the front and rear directions of the movable sheave 41 for pushing against the rear surface 13A of the outer cylinder 13.

  On the other hand, when the pushing movable sheave 41 is arranged in this way, the support shaft 39A of the pushing fixed sheave 39 around which the pushing rope 42 is wound with the pushing movable sheave 41, and the outer cylinder 13 The angle θ formed by the left side surface 13C can be increased. Thereby, as indicated by an arrow Y in FIG. 14, a part of the pressing fixed sheave 39 accommodated in the outer cylinder 13 can be sufficiently separated from the inner cylinder 21. Further, the protruding amount of the pressing fixed sheave 39 from the left side surface 13C can be reduced. As a result, a sufficient space is secured between the pressing fixed sheave 39 and the first-stage inner cylinder 21 without increasing the size between the left and right side surfaces 13C and 13D of the outer cylinder 13. The entire telescopic arm 12 can be configured compactly. The same applies to the pressing movable sheave 41 ′ and the pressing rope 42 ′ arranged on the right side with the telescopic cylinder 25 interposed therebetween.

  Reference numeral 43 denotes a clamshell bucket that is swingably attached to an attachment eye 24 provided on the front end side (lower end side) of the inner cylinder 23. The clamshell bucket 43 is opened and closed by expanding and contracting the bucket cylinder 44 to excavate earth and sand.

  The deep excavator 1 according to the present embodiment has the above-described configuration. Hereinafter, an operation of excavating the vertical shaft 101 using the deep excavator 1 on the ground 100 to be deep excavated will be described. .

  First, as shown in FIG. 1, the deep excavator 1 extends the telescopic cylinder 25 to the maximum extent so that the telescopic arm 12 is in the minimum contracted state, and the telescopic arm 12 is perpendicular to the ground 100 on which the vertical shaft 101 is to be excavated. Hold in a proper posture.

  Next, as shown in FIG. 2, the telescopic arm 25 is contracted by contracting the telescopic cylinder 25. That is, the tube 25 </ b> A of the expansion / contraction cylinder 25 is moved upward together with the sheave attachment 30, and the expansion / contraction movable sheave 33 is brought close to the expansion / contraction fixed sheave 31. Thus, the telescopic rope 34 wound around the two movable sheaves 33A and 33B of the telescopic movable sheave 33 and the two stationary sheaves 31A and 31B of the telescopic stationary sheave 31 is fed out. As a result, the second-stage inner cylinder 23 extends downward from the outer cylinder 13 by its own weight, and the first-stage inner cylinder 21 supported by the support rope 37 also extends downward from the outer cylinder 13 by its own weight.

  At this time, the pushing rope 42 is wound between the pushing movable sheave 41 supported by the sheave fitting 30 and the pushing fixed sheave 39, so that the pushing rope 42 always maintains a constant tension. The support rope 37 that supports the first-stage inner cylinder 21 between the outer cylinder 13 and the second-stage inner cylinder 23 always maintains a constant tension.

  As a result, the tension of the pushing rope 42 and the supporting rope 37 can maintain the state in which the inner cylinders 21 and 23 are extended from the outer cylinder 13, and the clamshell bucket 43 is pushed into the bottom surface 102 of the vertical shaft 101. be able to. In this state, by opening and closing the clamshell bucket 43 by the bucket cylinder 44, the shaft 101 can be deeply excavated by using the clamshell bucket 43, and a large amount of earth and sand is scooped up by the clamshell bucket 43. Can do.

  After scooping up the earth and sand with the clamshell bucket 43, the telescopic cylinder 25 is extended to move the tube 25A of the telescopic cylinder 25 downward together with the sheave attachment 30, and the telescopic movable sheave 33 is fixed for expansion and contraction. Separate from the sheave 31.

  As a result, the telescopic rope 34 is wound up between the movable sheaves 33A, 33B of the telescopic movable sheave 33 and the fixed sheaves 31A, 31B of the telescopic fixed sheave 31, and the inner cylinder 23 moves upward. Are accommodated in the inner cylinder 21. At this time, the other end 37B of the support rope 37 connecting the outer cylinder 13 and the inner cylinder 23 moves upward together with the inner cylinder 23, so that the inner cylinder 21 supported by the support rope 37 is also upward. To be accommodated in the outer cylinder 13. As a result, the telescopic arm 12 is again in the most contracted state shown in FIG.

  Next, as shown in FIG. 1, after the telescopic cylinder 25 reaches the maximum extension state and the telescopic arm 12 reaches the minimum contraction state, the tip end side of the boom 4 is lifted and the clamshell bucket 43 is removed from the shaft 101. Pull out. Then, after turning the upper swing body 3 toward a predetermined soil removal position while the lower traveling body 2 is stopped, the earth and sand gripped by the clamshell bucket 43 is discharged to this soil discharge position.

  Here, according to the deep excavator 1 according to the present embodiment, the tip 25C of the rod 25B of the telescopic cylinder 25 is pin-coupled to the bracket 13J provided on the outer cylinder 13 of the telescopic arm 12 using the pin 25D. Has been. On the other hand, the sheave fixture 30 that supports the movable sheave 33 for expansion and contraction and the movable sheave 41 for push-in is attached to the tube 25A of the expansion cylinder 25 that is a free end. Accordingly, when the telescopic cylinder 25 is extended in order to lift the earth and sand excavated by the clamshell bucket 43, the heavy tube 25A moves downward together with the sheave attachment 30.

  Accordingly, the telescopic rope 34 wound around the telescopic movable sheave 33 and the telescopic fixed sheave 31 receives a downward load due to the weight of the tube 25 </ b> A and the sheave attachment 30. As a result, the telescopic arm 12 can increase the pulling force of the inner cylinders 21 and 23 by using the weight of the tube 25A and the sheave fitting 30, and the pulling operation of the inner cylinders 21 and 23 by the telescopic cylinder 25 is efficient. Can be done well.

  According to the deep excavator 1 according to the present embodiment, the telescopic fixed sheave 31 is configured by two fixed sheaves 31A and 31B, and the telescopic movable sheave 33 is configured by two movable sheaves 33A and 33B. Has been. The telescopic rope 34 is hung around the two fixed sheaves 31A and 31B and the two movable sheaves 33A and 33B for a total of four times. As a result, for example, as in the prior art, the rope for expansion and contraction is compared with a configuration in which the four sheaves of the fixed sheave for expansion and contraction and the four sheaves of the movable sheave for expansion and contraction are totaled eight times. Can extend the life of the telescopic rope.

  Moreover, the telescopic rope 34 is hung four times between the two fixed sheaves 31A and 31B constituting the telescopic fixed sheave 31 and the two movable sheaves 33A and 33B constituting the telescopic movable sheave 33. Has been. As a result, the pull-up amount of the inner cylinders 21, 23 using the telescopic rope 34 can be made four times the stroke of the telescopic cylinder 25, and the inner cylinders 21, 23 can be pulled up efficiently.

  According to the present embodiment, the rod 25 </ b> B of the telescopic cylinder 25 is fixed on the upper side of the outer cylinder 13 and below the telescopic fixed sheave 31. As a result, the tube 25A of the telescopic cylinder 25 to which the sheave attachment 30 is attached can move upward and downward within a substantially upper half range of the outer cylinder 13 extending upward and downward. For this reason, for example, as shown in FIG. 1, even when the lower half of the outer cylinder 13 goes underground when excavating the vertical shaft 101, the operator in the cab 3 </ b> B of the upper swing body 3 can extend and retract the extension cylinder 25. Can be confirmed visually. As a result, workability and safety of excavation work using the deep excavation machine 1 can be improved.

  According to the present embodiment, the two sheave attachment guide rails 28 are fixed to the outside of the outer cylinder 13 in a state of extending in the length direction in parallel with the outer cylinder 13. On the other hand, the sheave fixture 30 is configured to move in the length direction of the outer cylinder 13 along the sheave fixture guide rail 28 in accordance with the expansion and contraction of the telescopic cylinder 25.

  Therefore, the sheave fixture 30 can be always moved on a fixed track by being guided by the sheave fixture guide rail 28. As a result, the expansion / contraction rope 34 wound around the expansion / contraction fixed sheave 31 and the expansion / contraction movable sheave 33 can smoothly follow the movement of the expansion / contraction movable sheave 33. , 23 can increase the stability of the expansion and contraction operation. Moreover, since the two sheave attachment guide rails 28 are fixed to the outer cylinder 13, the strength of the outer cylinder 13 can be increased by the sheave attachment guide rail 28, and the reliability of the entire telescopic arm 12 is improved. be able to.

  On the other hand, the tube 25 </ b> A of the telescopic cylinder 25 to which the sheave fixture 30 is attached can move on a fixed track along the sheave fixture guide rail 28. As a result, the strength of the telescopic cylinder 25 against buckling and lateral load can be increased, and the reliability of the telescopic cylinder 25 can be increased.

  According to the present embodiment, the pair of boom brackets 17 are provided on the rear surface 13A of the outer cylinder 13 positioned on the cab 3B side of the upper swing body 3, and the pair of boom brackets 17 are attached to the front end side of the boom 4. It has been. In addition, the telescopic cylinder 25 is disposed between the pair of boom brackets 17.

  As a result, the sheave fitting 30 attached to the tube 25A of the telescopic cylinder 25, the telescopic movable sheave 33 supported by the sheave fitting 30, the telescopic fixed sheave 31 and the telescopic movable sheave 33. The rope 34 and the like can be disposed at a position facing the cab 3B of the upper swing body 3. As a result, the operator in the cab 3B can expand and contract the inner cylinders 21 and 23 with respect to the outer cylinder 13 while observing the expansion cylinder 25 and the like, and can accurately perform this expansion and contraction operation.

  Since the boom bracket 17 is provided on the rear surface 13A of the outer cylinder 13, the telescopic cylinder 25, the telescopic fixed sheave 31, the sheave mounting tool 30, the telescopic movable sheave 33, etc. need not be provided on the front surface 13B of the outer cylinder 13. . For this reason, when the vertical shaft 101 is excavated, the telescopic cylinders 25 and the like do not come into contact with an obstacle and are damaged, and the workability of excavation work can be improved.

  On the other hand, as shown in FIG. 15, since the boom bracket 17 is provided on the rear surface 13A of the outer cylinder 13, the front surface 13B of the outer cylinder 13 is placed on the ground in order to bring the deep excavator 1 into the transport posture. Can do. Thus, the telescopic cylinder 25, the sheave mounting tool 30, the telescopic fixed sheave 31, the telescopic movable sheave 33, etc. are placed in an upward posture in which the weight of the telescopic arm 12 does not act without using a special table or the like. Can be held.

  Therefore, in the state where the deep excavator 1 is in the transport posture, maintenance work for the telescopic cylinder 25, the telescopic fixed sheave 31, the sheave mounting tool 30, the telescopic movable sheave 33, etc. attached to the outer cylinder 13 is performed on the ground. Since it can be performed at a close position, the workability of this maintenance work can be improved.

  According to the present embodiment, the rectangular tube-shaped tube guide 26 is provided on the rear surface 13A of the outer tube 13, and the tube 25A of the telescopic cylinder 25 is accommodated in the tube guide 26 so as to be movable (slidable). Thereby, the tube 25 </ b> A of the telescopic cylinder 25 that has become a free end can be guided in the length direction of the outer cylinder 13 by the tube guide 26. Therefore, even if the sheave attachment 30 is attached to the tube 25A, the tube 25A can be smoothly moved along the tube guide 26.

  In addition, since the tube 25A of the telescopic cylinder 25 can move along a certain track along the tube guide 26, the strength of the telescopic cylinder 25 against buckling and lateral load can be increased. Moreover, by accommodating the tube 25A in the tube guide 26, the tube 25A can be protected from falling rocks or the like due to excavation work of the vertical shaft 101.

  According to the present embodiment, the outer cylinder 13 is formed in a cylindrical shape having a hexagonal cross-sectional shape, and the outer cylinder 13 is provided between the rear surface 13A and the left and right side surfaces 13C and 13D. The inclined surfaces 13E and 13F are provided. Thereby, the buckling strength can be increased with respect to the load acting on the outer cylinder 13 and the life of the outer cylinder 13 can be extended, so that the reliability of the entire telescopic arm 12 can be increased.

  In addition, since the movable sheave 33 for expansion and contraction is disposed outside the left side surface 13C of the outer cylinder 13, the movable sheave 33 for expansion and contraction is left and right with a slight distance from the left side surface 13C of the outer cylinder 13. Face to face. Thereby, it is possible to prevent the movable sheave 33 for expansion and contraction from greatly projecting to the rear surface 13A side of the outer cylinder 13, and even when the movable movable sheave 33 for expansion and contraction having the large movable sheaves 33A and 33B is used. The periphery of the movable movable sheave 33 can be reduced in size. As a result, the life of the telescopic rope 34 can be extended by using the telescopic movable sheave 33 provided with the movable sheaves 33A and 33B having a large diameter. The telescopic movable sheave 33 ′ is arranged outside the right side surface 13 </ b> D of the outer cylinder 13, so that the same effect as described above can be obtained.

  Thus, since the deep excavator 1 according to the present embodiment has a structure that can extend the life of the telescopic rope 34, the load acting on the telescopic rope 34 can be set large. As a result, a large load can be lifted by the second-stage inner cylinder 23 to which the telescopic rope 34 is connected, and the capacity of the clamshell bucket 43 attached to the distal end side of the inner cylinder 23 can be increased. By excavating a large amount of earth and sand, the drilling efficiency can be increased.

  Furthermore, according to the deep excavator 1 according to the present embodiment, the sheave mounting openings 16 and 16 'are provided on the lower side of the outer cylinder 13, and a part of the pressing fixed sheaves 39 and 39' is part of the sheave mounting opening. It is arranged inside the outer cylinder 13 through 16, 16 '. Thereby, even when the diameter of the fixed sheaves 39, 39 ′ for pushing is set to be large, the fixed sheaves 39, 39 ′ for pushing can be attached to the outer cylinder 13 in a compact manner. As a result, the life of the pushing ropes 42 and 42 'can be extended by using the pushing sheaves 39 and 39' having a large diameter.

  Moreover, since the pressing fixed sheaves 39 and 39 'are arranged at the positions of the sheave mounting openings 16 and 16' provided on the lower side of the outer cylinder 13, the pressing fixing sheaves 39 and 39 'are fixed to the lower end of the outer cylinder as in the prior art. There is no need to place sheaves. Thus, even when the first-stage inner cylinder 21 is accommodated in the outer cylinder 13, the lower flange plate 22 provided at the lower end of the inner cylinder 21 may interfere with the pressing fixed sheaves 39 and 39 '. Absent. Accordingly, the lower flange plate 22 of the inner cylinder 21 can be brought close to the lower end portion 13H of the outer cylinder 13, that is, the vicinity of the lower flange plate 15. As a result, the total length when the telescopic arm 12 is reduced to the minimum can be shortened, and for example, when the deep excavator 1 is transported, a compact transport posture can be achieved.

  In the above-described embodiment, the outer cylinder 13 constituting the telescopic arm 12 has the telescopic cylinder 25, the sheave mounting guide rail 28, the sheave mounting 30 and the telescopic mounting on the rear surface 13A side to which the boom bracket 17 is mounted. The structure which arrange | positions the fixed sheave 31, the movable sheave 33 for expansion / contraction etc. is illustrated. However, the present invention is not limited to this, and may be configured as a modification shown in FIG. 16, for example. In other words, the telescopic cylinder 25, the sheave mounting tool guide rail 28, the sheave mounting tool 30, the telescopic fixed sheave 31, the telescopic movable sheave 33, and the like may be arranged on the front surface 13B side of the outer cylinder 13. Thereby, for an operator who is used to the existing telescopic arm, there is no sense of incongruity when operating the deep excavator, and the operability can be improved.

  In the embodiment described above, the telescopic fixed sheaves 31, 31 ', the telescopic movable sheaves 33, 33', the telescopic ropes 34, 34 ', the supporting stationary sheaves 35, 35', the supporting ropes 37, 37 ', The members such as the pressing fixed sheaves 39 and 39 ′, the pressing movable sheaves 41 and 41 ′, and the pressing ropes 42 and 42 ′ are symmetric with respect to the outer cylinder 13 with the telescopic cylinder 25 interposed therebetween. The case where two sets are provided is illustrated. However, the present invention is not limited to this, but the telescopic fixed sheave 31, the telescopic movable sheave 33, the telescopic rope 34, the supporting fixed sheave 35, the supporting rope 37, the pushing fixed sheave 39, the pushing movable sheave 41, A set of each member such as the pushing rope 42 may be provided at the center of the outer cylinder 13 in the left and right directions.

  Furthermore, in the above-described embodiment, the case where the sheave fixture guide rail 28 for guiding the sheave fixture 30 is formed of a rectangular tube having a rectangular cross-sectional shape is illustrated. However, the present invention is not limited to this, and the sheave fixture guide rail may be formed using, for example, a steel material having an L-shaped cross-sectional shape.

2 Lower traveling body (car body)
3 Upper swing body (car body)
4 Boom 12 Telescopic arm 13 Outer cylinder 13A Rear surface 13B Front surface 13C Left side surface 13D Right side surface 13E Left inclined surface 13F Right inclined surface 13G Upper end portion 13H Lower end portion 16 Sheave mounting opening 17 Boom bracket 21 First stage inner cylinder 23 Inside second stage Tube 25 Telescopic cylinder 25A Tube 25B Rod 26 Tube guide 28 Sheave mounting guide rail 30 Sheave mounting 31, 31 'Telescopic fixed sheave 33, 33' Telescopic movable sheave 34, 34 'Telescopic rope 35, 35' Support Fixed sheave 38, 38 'Pushing mechanism 39, 39' Pushing fixed sheave 41, 41 'Pushing movable sheave 42, 42' Pushing rope

The present invention relates to a boom to be mounted, and an inner cylinder that is provided so as to extend upward and downward on the distal end side of the boom and that is accommodated inside the outer cylinder so as to be extendable in the length direction. A telescopic arm having a tube, a telescopic cylinder disposed along a length direction of the outer tube constituting the telescopic arm, a telescopic fixed sheave fixed to the outer tube, and the telescopic cylinder A sheave fixture supported by the outer cylinder so as to be movable in the length direction of the outer cylinder so as to approach or move away from the fixed sheave for expansion and contraction, and a movable sheave for expansion and contraction provided in the sheave attachment And one end side is locked to the outer cylinder and the other end side is locked to the inner cylinder which is the innermost of the inner cylinders, and a midway part is wound around the telescopic fixed sheave and the telescopic movable sheave. Multi-stage telescopic arm comprising a stretchable rope It is applied to the beam apparatus.

A feature of the configuration adopted by the invention of claim 1 is that the telescopic cylinder is constituted by a hydraulic cylinder having a tube and a rod having one side fixed to the piston within the tube and the other side protruding outward from the tube. With the rod of the telescopic cylinder facing upward, the tip of the rod is attached to the outer cylinder of the telescopic arm and the tube of the telescopic cylinder is movable in the length direction of the outer cylinder, It is attached to the tube of the telescopic cylinder.

The invention of claim 2 is that the tip of the rod of the telescopic cylinder is attached to the upper side of the outer cylinder.

The invention according to claim 3, outside of the outer cylinder, the outer cylinder in parallel to the sheave fitting guide rails attached to the outer cylinder extending in the longitudinal direction is provided with the sieve fitting The configuration is such that the sheave attachment guide rail moves along the expansion and contraction of the expansion cylinder.

A fourth aspect of the present invention, the lower portion than an outer said sieve fitting of the outer cylinder is left, facing at an interval in the right direction of the pair mounted swingably on the distal end side of the boom A boom bracket is provided , and the tube of the telescopic cylinder is arranged in a gap formed between the pair of boom brackets.

The invention of claim 5, on the outside of the outer tube is to the tube movably accommodate tubes of the telescopic cylinder has a configuration providing a tube guide for guiding in the longitudinal direction of the outer cylinder.

According to this arrangement, the tube of the telescopic cylinder, by guiding the length of the outer tube by the tube guide, it is possible to smoothly move the tube sieve fitting is mounted. For this reason, the tube of the expansion / contraction cylinder can move on a fixed track along the tube guide, and the strength of the expansion / contraction cylinder against buckling or lateral load can be increased. Furthermore, by housing the tube in the tube guide, the tube can be protected from falling rocks or the like during excavation.

The invention of claim 6, wherein the outer cylinder is left across the rear surface mounted on the distal end side of at least the boom, rear surface and front, a front facing in the rear direction, the rear surface and the front surface, facing in the right direction Left and right side surfaces, a left inclined surface disposed obliquely between the rear surface and the left side surface, and a right inclined surface disposed obliquely between the rear surface and the right side surface. The movable movable sheave for expansion and contraction is configured to be arranged outside the left and right side surfaces constituting the outer cylinder in the left and right directions. .

The invention of claim 7, wherein the outer cylinder includes a rear surface attached to the distal end side of the boom, the rear surface and the front, a front facing in the rear direction, the rear and left sides of the front, facing in the right direction The left side surface and the right side surface, the left inclined surface disposed obliquely between the rear surface and the left side surface, and the right inclined surface disposed obliquely between the rear surface and the right side surface. It is in the shape of a rectangular tube having a square cross-sectional shape. Thereby, buckling strength can be raised with respect to the load which acts on an outer cylinder, and the lifetime of an outer cylinder can be extended.

The invention of claim 8, between the outer cylinder and the first stage of the inner tube to the outermost of the inner cylinder of the plurality of stages, the outer and inner cylinder of the first stage by the telescopic cylinder A pushing mechanism is provided to push the first-stage inner cylinder in the extending direction when the cylinder is extended from the cylinder, and the pushing mechanism is provided on the outer cylinder at a lower side of the outer cylinder. A fixed sheave for pushing, a movable sheave for pushing provided on the sheave fixture at a position lower than the movable sheave for expansion and contraction, one end side being locked to the outer cylinder, and the other end side being an inner side of the outer cylinder And a middle portion is constituted by a pushing rope wound around the pushing fixed sheave and the pushing movable sheave, on the lower side of the outer cylinder. sheave mounting opening provided at a position where the pushing fixed sheave is provided Are part of the push for fixed sheave lies in that a configuration be placed inside of the outer cylinder through the sieve mounting opening.

The invention of claim 9 comprises a self-propelled vehicle body, a boom provided to the vehicle body so as to be able to move up and down, and a multistage telescopic arm device provided on the tip side of the boom, wherein the multistage telescopic arm device comprises: A telescopic arm having an outer cylinder extending upward and downward, and a plurality of stages of inner cylinders accommodated in the lengthwise direction inside the outer cylinder, and a length direction of the outer cylinder constituting the telescopic arm A telescopic cylinder disposed along the outer cylinder, a telescopic fixed sheave fixed to the outer cylinder, and a length of the outer cylinder so as to approach or move away from the telescopic stationary sheave attached to the telescopic cylinder. A sheave fixture supported by the outer cylinder so as to be movable in the vertical direction, a movable sheave for expansion and contraction provided on the sheave fixture, one end side of which is locked to the outer cylinder and the other end side of the inner cylinder Locked to the innermost inner cylinder, halfway Position is applied to the deep digging excavator comprising a telescopic rope which is wound telescoping movable sheave and wound with the elastic fixing sheave.

The telescopic cylinder is constituted by a hydraulic cylinder having a tube and a rod having one side fixed to the piston in the tube and the other side protruding outward from the tube, and the rod of the telescopic cylinder is in an upward state. The rod tip is attached to the outer cylinder of the telescopic arm, the tube of the telescopic cylinder is movable in the length direction of the outer cylinder, and the sheave fitting is attached to the tube of the telescopic cylinder. It is a feature.

On the other hand, the tube 25A of the telescopic cylinder 25 extends below side, the left, are arranged in a gap within 17B formed between the boom bracket 17 paired in the right direction. Further, a sheave mounting tool 30 to be described later is mounted on the upper side of the tube 25A. Accordingly, the tube 25A is moved along the outer cylinder 13 together with the sheave fitting 30 by expanding and contracting the telescopic cylinder 25 between the most extended state shown in FIG. 1 and the most contracted state shown in FIG. , It is configured to move downward.

Reference numeral 26 denotes a tube guide provided outside the rear surface 13A of the outer cylinder 13. The tube guide 26 accommodates the tube 25A of the telescopic cylinder 25 in a movable manner. As shown in FIGS. 12 and 13, the tube guide 26 is formed by a rectangular tube having a substantially square cross-sectional shape. The tube guide 26 is disposed in a gap 17B formed between the pair of boom brackets 17, and is fixed to the rear surface 13A of the outer cylinder 13 along the length direction thereof. Thus, the tube 25A of Shin contraction cylinder 25 can be moved in the longitudinal direction of the outer cylinder 13 while being guided by the tube guide 26.

Here, according to the deep excavator 1 according to the present embodiment, the tip 25C of the rod 25B of the telescopic cylinder 25 is pin-coupled to the bracket 13J provided on the outer cylinder 13 of the telescopic arm 12 using the pin 25D. Has been. On the other hand, the sheave fixture 30 supporting the telescopic movable sheave 33 and push the movable sheave 41 is attached to the tube 25A of Shin contraction cylinder 25. Accordingly, when the telescopic cylinder 25 is extended in order to lift the earth and sand excavated by the clamshell bucket 43, the heavy tube 25A moves downward together with the sheave attachment 30.

According to the present embodiment, the rectangular tube-shaped tube guide 26 is provided on the rear surface 13A of the outer tube 13, and the tube 25A of the telescopic cylinder 25 is accommodated in the tube guide 26 so as to be movable (slidable). Thus, the tube 25A of Shin contraction cylinder 25, can be guided in the longitudinal direction of the outer cylinder 13 by the tube guide 26. Therefore, even if the sheave attachment 30 is attached to the tube 25A, the tube 25A can be smoothly moved along the tube guide 26.

Claims (9)

A plurality of steps provided on the front end side of the boom (4) of the attachment object so as to extend upward and downward and accommodated in the lengthwise direction inside the outer cylinder (13) and inside the outer cylinder (13). A telescopic arm (12) having an inner cylinder (21, 23), a telescopic cylinder (25) disposed along a length direction of the outer cylinder (13) constituting the telescopic arm (12), and the outer A telescopic fixed sheave (31, 31 ') fixed to the cylinder (13) and a telescopic cylinder (25) attached to the telescopic cylinder (25) so as to approach or separate from the telescopic fixed sheave (31, 31'). A sheave fitting (30) that moves in the longitudinal direction of the outer cylinder (13), a telescopic movable sheave (33, 33 ') provided on the sheave fitting (30), and one end side of which is the outer cylinder (13) and the other end is the inner cylinder (21, 23) An expansion rope (which is locked to the inner cylinder (23) which is the innermost of them, and is wound around the expansion / contraction fixed sheave (31, 31 ') and the expansion / contraction movable sheave (33, 33')). 34, 34 '), and a multi-stage telescopic arm device comprising:
The telescopic cylinder (25) includes a tube (25A) and a hydraulic cylinder having one side fixed to the piston in the tube (25A) and the other side protruding to the outside from the tube (25A). And
With the rod (25B) of the telescopic cylinder (25) facing upward, the tip of the rod (25B) is attached to the outer cylinder (13) of the telescopic arm (12) and the tube of the telescopic cylinder (25) ( 25A) as the free end,
The multistage telescopic arm device, wherein the sheave mounting tool (30) is configured to be mounted on a tube (25A) of the telescopic cylinder (25).   2. The multistage telescopic arm device according to claim 1, wherein the tip of the rod (25 </ b> B) of the telescopic cylinder (25) is attached to the upper side of the outer cylinder (13). Provided on the outside of the outer cylinder (13) is a sheave fixture guide rail (28) that extends in the length direction in parallel with the outer cylinder (13) and is attached to the outer cylinder (13).
The multistage telescopic arm device according to claim 1, wherein the sheave fixture (30) is configured to move along the sheave fixture guide rail (28) in accordance with the expansion and contraction of the telescopic cylinder (25). The outer cylinder (13) and the lower part of the sheave fitting (30) are opposed to each other in the left and right directions with a space therebetween and are swingably attached to the tip of the boom (4). A pair of boom brackets (17) are provided;
The multistage telescopic arm device according to claim 1, wherein the tube (25A) of the telescopic cylinder (25) is arranged in a gap (17B) formed between the pair of boom brackets (17).   On the outside of the outer cylinder (13), a tube guide (25A) of the telescopic cylinder (25) is movably accommodated, and the tube (25A) is guided in the length direction of the outer cylinder (13). 26. The multistage telescopic arm device according to claim 1, wherein the multi-stage telescopic arm device is provided. The outer cylinder (13) includes at least a rear surface (13A) attached to the front end side of the boom (4), a front surface (13B) facing the rear surface (13A) in the front and rear directions, and the rear surface (13A). And the left side surface (13C) and the right side surface (13D) facing left and right with the front surface (13B) in between, and the rear surface (13A) and the left side surface (13C) are inclined obliquely. In a rectangular tube shape having a polygonal cross-sectional shape having a left inclined surface (13E) and a right inclined surface (13F) disposed obliquely between the rear surface (13A) and the right side surface (13D). Configure
The movable movable sheave (33, 33 ') for expansion and contraction is configured to be disposed on the outer side in the left and right directions with respect to the left and right side surfaces (13C, 13D) constituting the outer cylinder (13). The multistage telescopic arm device as described.   The outer cylinder (13) includes a rear surface (13A) attached to the front end side of the boom (4), a front surface (13B) facing the rear surface (13A) in the front and rear directions, the rear surface (13A), and The left side surface (13C) and the right side surface (13D) facing in the left and right directions across the front surface (13B), and the rear surface (13A) and the left side surface (13C) are arranged obliquely. The left inclined surface (13E) and the right inclined surface (13F) disposed obliquely between the rear surface (13A) and the right side surface (13D) are formed into a rectangular tube shape having a hexagonal cross-sectional shape. The multistage telescopic arm device according to claim 1. Between the outer cylinder (13) and the first-stage inner cylinder (21) located on the outermost side among the plurality of stages of inner cylinders (21, 23), the expansion cylinder (25) allows the first stage. A pushing mechanism (38, 38 ') for pushing the first-stage inner cylinder (21) in the extending direction when the inner cylinder (21) of the eye is extended from the outer cylinder (13);
The pushing mechanism (38, 38 ') is located on the lower side of the outer cylinder (13), and a fixed sheave for pushing (39, 39') provided on the outer cylinder (13);
A movable sheave for pushing (41, 41 ') provided on the sheave fixture (30) at a position lower than the movable sheave (33, 33') for expansion and contraction;
One end is locked to the outer cylinder (13) and the other end is locked to the first-stage inner cylinder (21) through the inner side of the outer cylinder (13). A pushing rope (42, 42 ') wound around the sheave (39, 39') and the pushing movable sheave (41, 41 ');
A sheave mounting opening (16, 16 ') is provided at a position where the pushing fixed sheave (39, 39') is provided on the lower side of the outer cylinder (13),
2. The multistage telescopic arm according to claim 1, wherein a part of the pushing fixed sheave (39, 39 ′) is arranged inside the outer cylinder (13) through the sheave mounting opening (16, 16 ′). apparatus. A self-propelled vehicle body (2, 3), a boom (4) provided on the vehicle body (2, 3) so as to move up and down, and a multistage telescopic arm device (provided on the tip side of the boom (4)) 11)
The multistage telescopic arm device (11) includes an outer cylinder (13) extending in the upward and downward directions, and a plurality of inner cylinders (21, 23) accommodated inside the outer cylinder (13) so as to be extendable in the length direction. ), A telescopic cylinder (25) disposed along the length direction of the outer cylinder (13) constituting the telescopic arm (12), and fixed to the outer cylinder (13) The telescopic fixed sheave (31, 31 ') and the outer cylinder (13) attached to the telescopic cylinder (25) so as to approach or separate from the telescopic fixed sheave (31, 31'). ) And a movable sheave for extension / contraction (33, 33 ') provided on the sheave attachment (30), and one end side of the sheave attachment (30) is locked to the outer cylinder (13). And the other end is the innermost of the inner cylinders (21, 23) The telescopic ropes (34, 34 ') which are locked to the inner cylinder (23) and which are wound around the telescopic fixed sheaves (31, 31') and the telescopic movable sheaves (33, 33 '). )
The telescopic cylinder (25) includes a tube (25A) and a hydraulic cylinder having one side fixed to the piston in the tube (25A) and the other side protruding to the outside from the tube (25A). And
With the rod (25B) of the telescopic cylinder (25) facing upward, the tip of the rod (25B) is attached to the outer cylinder (13) of the telescopic arm (12) and the tube of the telescopic cylinder (25) ( 25A) as the free end,
The deep excavation machine characterized in that the sheave attachment (30) is attached to the tube (25A) of the telescopic cylinder (25).

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