JP6316769B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as a hydraulic excavator, and more particularly to a construction machine in which a cab that defines a cab is moved up and down.

  In general, a hydraulic excavator, which is a typical example of a construction machine, includes a lower traveling body that can be self-propelled, an upper revolving body that is turnably mounted on the lower traveling body, and a working device that is provided on the upper revolving body so as to be able to move up and down And. The upper revolving structure has a revolving frame (body frame) that forms a support structure, and a cab that defines a cab is mounted on the left side of the front portion of the revolving frame.

  Here, the hydraulic excavator is also suitably used for scrap work for loading and unloading construction waste materials, iron scraps and the like (scrap) on a loading platform of a transport vehicle such as a truck. When performing such scrap work, for example, if the cab of the excavator is at a lower position than the loading platform of the transport vehicle, the scrap accumulated on the loading platform of the transport vehicle from the operator operating the excavator in the cab. There is a problem that it becomes difficult to see.

  On the other hand, a hydraulic excavator has been proposed in which an elevating cylinder is provided between a bracket fixed on the rear end side of the cab and a revolving frame, and the cab is moved up and down in accordance with the expansion and contraction of the elevating cylinder. . According to the hydraulic excavator equipped with the liftable cab, the operator in the cab can easily visually check the scrap stacked on the loading platform of the transport vehicle by extending the lift cylinder and moving the cab to the raised position. Can improve the workability of scrap work.

  Here, the hydraulic excavator provided with the liftable cab is provided with two pillars positioned on the rear side of the cab and extending upward and downward on the revolving frame. Each bracket is fixed to the cab. A plurality of guide rollers are provided to sandwich the roller from the front and rear directions. Therefore, when the cab moves up and down due to expansion and contraction of the elevating cylinder, the guide roller rolls along the support column, so that the cab is guided upward and downward along the support column (Patent Document). 1).

JP-A-3-72122

  By the way, when a hydraulic excavator equipped with an elevating cab is loaded onto a transport vehicle such as a trailer and transported to a work site, a maximum height from the road surface of the loaded hydraulic excavator is determined. In order to keep it inside, it is necessary to reduce the lifting cylinder to lower the cab to the lowered position.

  However, even if the cab is lowered to the lowered position, if the upper end of the support column installed on the swivel frame exceeds the height limit during transportation, the support column must be disassembled during transportation and reassembled again at the work site. There is a problem that a lot of work is required. On the other hand, when the upper end of the support column installed on the revolving frame is kept within the height limit during transportation, the upward and downward movement (stroke) of the cab that moves up and down along the support column is small. There is a problem of becoming.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a construction machine capable of suppressing the height of a support column and ensuring a large amount of cab lift.

The present invention for solving the above problems, and the body frame forming the support structure, the left on the body frame, right and front, top is erected at intervals in the rear direction, a plurality of downwardly extending A column, a guide member that engages with the column and moves up and down along the column, a lifting support base that is mounted on the guide member, and the lifting and lowering that is provided between the vehicle body frame and the guide member A lifting cylinder that lifts and lowers the support base, a cab that is supported by the lift support base and defines a driver's cab, one end attached to the guide member and the other end attached to the vehicle body frame side, A cable / hose guide member that is deformed in accordance with the up-and-down movement, the guide member surrounding the support column from the outside, and a guide tube provided on the guide tube and the surface of the support column Slidably applied to a construction machine comprising configured to include a slide member for guiding the guide cylinder while in contact with the.

  A feature of the present invention is that the upper end of the support column is disposed at a position lower than the height limit during transportation, and the sliding member of the guide member is provided at two positions, an upper position and a lower position of the guide cylinder. The cable / hose guide member is arranged such that one end of the cable / hose guide member is attached to the guide tube below the attachment position of the upper sliding member disposed at the upper position of the guide tube.

  According to the present invention, since the upper end of the support column is disposed at a position lower than the height limit during transportation, it is not necessary to disassemble the support column when the construction machine is loaded on the transport vehicle and transported. The workability during transportation can be improved. In addition, by attaching one end of the cable / hose guide member to the guide cylinder at a lower position than the mounting position of the upper sliding member arranged at the upper position of the guide cylinder, the sliding member is placed near the upper end of the guide cylinder. Can be arranged. As a result, the guide cylinder provided with the sliding member can be stably moved to the upper end of the support column, so that the length of the support column can be used without waste, and the cab lift (upward and downward) Large stroke) can be secured.

1 is a front view showing an elevating cab type hydraulic excavator according to an embodiment of the present invention. It is a perspective view which shows a turning frame, a support | pillar, a guide member, a raising / lowering support stand, a raising / lowering cylinder, a cab, etc. It is a disassembled perspective view which shows the state which removed the cab from the raising / lowering support stand. It is a front view which expands and shows the support | pillar, guide member, raising / lowering support stand, raising / lowering cylinder, cab, cable / hose guide member, etc. in FIG. It is a front view similar to FIG. 4 which shows the state which the raising / lowering support stand moved to the raising position. It is sectional drawing which looked at the support | pillar, the guide member, the raising / lowering support stand, the raising / lowering cylinder, the cab, etc. from the arrow VI-VI direction in FIG. It is a principal part enlarged view which shows the guide member in FIG. 5, a cable / hose guide member, etc. FIG. It is sectional drawing which shows internal structures, such as a support | pillar and a guide member. It is sectional drawing which looked at the support | pillar, the guide member, the cable / hose guide member, etc. from the arrow IX-IX direction in FIG. It is a disassembled perspective view which shows an upper side sliding member, a guide cylinder side bracket, a cable / hose guide member, etc. It is sectional drawing which looked at the sliding member, the greasing hose, the bracket, the notch part, etc. from the arrow XI-XI direction in FIG. It is an external view which shows the state which loaded the hydraulic excavator provided with the raising / lowering type cab on the transport vehicle.

  Hereinafter, an embodiment of a construction machine according to the present invention will be described in detail with reference to the accompanying drawings, taking a hydraulic excavator provided with an elevating cab as an example.

  In the figure, a hydraulic excavator 1 which is a typical example of a construction machine has a vehicle body constituted by a crawler-type lower traveling body 2 capable of self-propelling and an upper revolving body 3 which is rotatably mounted on the lower traveling body 2. ing. Here, an elevating cab 29 described later is provided on the left side of the front part of the upper swing body 3, and this cab 29 is configured to move up and down between a lowered position shown in FIG. 4 and an elevated position shown in FIG. It has become.

  A work device 4 including a boom 4A, an arm 4B, a bucket 4C, and the like is provided on the front side of the upper swing body 3 so as to be able to move up and down. This working device 4 performs, for example, scrap work for loading and unloading scraps such as building waste and iron scraps on a truck bed.

  The upper turning body 3 is provided on the lower traveling body 2 so as to be turnable via a turning device. The upper revolving unit 3 includes a revolving frame 5 as a vehicle body frame forming a support structure, a counterweight 6 provided at the rear end of the revolving frame 5 to balance the weight with the work device 4, and a front side of the counterweight 6. Positioned and mounted equipment (not shown) such as an engine and a heat exchange device mounted on the swivel frame 5, an exterior cover 7 covering the mounted equipment, and left and right rear struts 8 and 9, which will be described later, , Right front struts 10, 11, rear guide member 12, left front guide member 22, right front guide member 25, lift support 27, lift cylinder 28, cab 29, and the like.

  The revolving frame 5 serves as a base of the upper revolving structure 3, and a cab 29 that can be moved up and down via an elevating support base 27 is disposed on the left side of the front part of the revolving frame 5. On the swivel frame 5, a total of four columns, a left rear column 8 and a right rear column 9 positioned on the rear side of the cab 29, and a left front column 10 and a right front column 11 positioned on the front side of the cab 29 are erected. Has been. As shown in FIGS. 4 and 5, the revolving frame 5 includes left and right frame side brackets 5A (left side) that are positioned on the rear side of the left and right rear struts 8 and 9 and extend upward and downward. The cable / hose guide member 30 described later is attached to each frame side bracket 5A.

  The left rear column 8 is located on the left rear side of the cab 29 and is arranged with a space left and right with respect to the right rear column 9. The left rear column 8 is formed of a square cylinder having a square cross-sectional shape having a front surface 8A, a rear surface 8B, a left side surface 8C, and a right side surface 8D, and extends upward and downward with its lower end fixed to the revolving frame 5. ing. A thin plate-like surface plate 8E is fixed to each of the four surfaces of the front surface 8A, the rear surface 8B, the left surface 8C, and the right surface 8D of the left rear column 8.

  In this case, as shown in FIG. 12, when the excavator 1 is loaded on a trailer 100 and transported on a public road, the distance from the road surface to the height restriction position is H0, and from the road surface to the upper end 8F of the left rear column 8 The distance H1 is set smaller than the distance H0 (H1 <H0). Thus, the upper end 8F of the left rear column 8 is arranged at a position lower than the height limit during transportation. Thereby, when the excavator 1 is loaded on the trailer 100 and transported, the complicated work of disassembling the left and right rear supports 8 and 9 can be eliminated. Here, the transport height limit is a height determined by road-related laws and other laws when a transport vehicle is loaded with a load and travels on a public road.

  The right rear support column 9 is located on the right rear side of the cab 29 and is disposed with a space in the left and right directions with respect to the left rear support column 8. The right rear support column 9 is formed of a rectangular cylinder similar to the left rear support column 8 and extends upward and downward with its lower end fixed to the revolving frame 5. A front surface plate 9E is fixed to each of the four surfaces of the front surface 9A, rear surface 9B, left side surface 9C, and right side surface 9D of the right rear column 9. Here, the upper end 9F of the right rear column 9 is disposed at the same height as the upper end 8F of the left rear column 8, that is, a position lower than the height limit during transportation.

  The left front column 10 is located on the left front side of the cab 29 and is disposed with a distance in the front and rear directions with respect to the left rear column 8 and with a distance in the left and right directions with respect to the right front column 11. The left front strut 10 is formed of a rectangular tube whose length in the upper and lower directions is smaller than that of the left and right rear struts 8 and 9, and extends upward and downward with the lower end fixed to the revolving frame 5. . A thin plate-like surface plate 10A is fixed to each of the front, rear, left, and right surfaces of the left front column 10.

  The right front column 11 is located on the right front side of the cab 29 and is disposed with a distance in the front and rear directions with respect to the right rear column 9 and with a distance in the left and right directions with respect to the left front column 10. The right front column 11 is formed of a rectangular tube similar to the left front column 10 and extends upward and downward with its lower end fixed to the revolving frame 5. A front surface plate 11A is fixed to each of the four front, rear, left, and right surfaces of the right front column 11.

  The rear guide member 12 is provided so as to engage with the left rear column 8 and the right rear column 9, and moves up and down along the left and right rear columns 8, 9. Here, the rear guide member 12 includes a rear guide tube 13 described later, and a plurality of upper sliding members 16 and a lower sliding member 20 provided on the rear guide tube 13.

  As shown in FIG. 3, the rear guide cylinder 13 is formed in a rectangular frame shape that extends leftward and rightward on the rear side of the cab 29 as a whole, and is fixed to a rear end of an elevating support base 27 described later. The rear guide cylinder 13 is formed of a rectangular plate extending in the left and right directions. The left end side faces the front surface 8A of the left rear support column 8 and the right end side faces the front plate 13A facing the front surface 9A of the right rear support column 9; It consists of a rectangular plate extending in the right direction, a rear plate 13B whose left end faces the rear surface 8B of the left rear column 8 and whose right end faces the rear surface 9B of the right rear column 9, and a left side 8C of the left rear column 8 The front plate 13 </ b> A and the rear plate 13 </ b> B are connected in a state of facing in the left and right directions, the left outer plate 13 </ b> C disposed on the outer side (left side surface) of the rear guide tube 13, and the right side surface of the right rear column 9. The front plate 13 </ b> A and the rear plate 13 </ b> B are connected in a state of facing 9 </ b> D in the left and right directions, and is surrounded by a right outer plate 13 </ b> D disposed on the outer side (right side surface) of the rear guide cylinder 13.

  Further, in the rear guide cylinder 13, a left inner plate 13E that connects the front plate 13A and the rear plate 13B in a state facing the right side surface 8D of the left rear column 8 in the left and right directions, and a right rear column 9 is provided with a right inner plate 13F that connects the front plate 13A and the rear plate 13B in a state of facing the left side surface 9C of the No. 9 in the left and right directions. As a result, the rear guide cylinder 13 includes a left rear guide cylinder portion 14 having a square cross section surrounding the left rear column 8 by the front plate 13A, the rear plate 13B, the left outer plate 13C, and the left inner plate 13E, the front plate 13A, and the rear plate 13A. The face plate 13B, the right outer plate 13D, and the right inner plate 13F have a right rear guide tube portion 15 having a square cross section surrounding the right rear column 9.

  A rectangular upper portion for attaching an upper sliding member 16 to be described later at the upper position facing the left rear column 8 among the front plate 13A, the rear plate 13B, the left outer plate 13C, and the left inner plate 13E of the rear guide tube 13. One square hole 13G is formed (four in total) (see FIG. 9). On the other hand, a lower sliding member 20 to be described later is attached to a lower position facing the left rear column 8 among the front plate 13A, the rear plate 13B, the left outer plate 13C, and the left inner plate 13E of the rear guide tube 13. One rectangular lower square hole (not shown) is formed.

  Similarly, the upper sliding member 16 is located at the upper and lower positions facing the right rear column 9 among the front plate 13A, the rear plate 13B, the right outer plate 13D, and the right inner plate 13F of the rear guide tube 13. An upper square hole (not shown) for attaching the lower sliding member 20 and a lower square hole (not shown) for attaching the lower sliding member 20 are formed.

  A total of eight upper sliding members 16 are provided on the upper portion of the rear guide cylinder 13, four in each of the portions facing the left rear column 8 and the right rear column 9. Here, since each upper sliding member 16 has substantially the same configuration, the upper sliding member 16 disposed on the left end side of the front plate 13A will be described with reference to FIG. 9 and FIG.

  The upper sliding member 16 uses a fixture 17 that is detachably fixed to the front plate 13A of the rear guide cylinder 13 using a plurality (for example, six) of bolts 17A, and a plurality (for example, two) of bolts 18A. And a sliding plate 18 attached to the fixture 17.

  Here, the fixing tool 17 is provided with a fitting projection 17B that is positioned by sandwiching the sliding plate 18 from above and below, and that fits into the upper square hole 13G of the rear guide cylinder 13. Six bolt insertion holes 17C through which the bolts 17A are inserted are drilled on both the left and right sides of the fixture 17, and each bolt insertion hole 17C has a counterbore hole that accommodates the head of the bolt 17A. 17C1 is formed. In addition, the fixing tool 17 is formed with an oil passage 17D that penetrates the fixing tool 17 in the upward and downward directions, and has a center portion in the upper and lower directions penetrating in the plate thickness direction. The end face 17F and the front face 17G are provided with hose connection ports 17H for connecting a greasing hose 19 described later. The greasing hose 19 is connected to one of the three hose connection ports 17H, and the other two hose connection ports 17H are sealed with a sealing plug 17J.

  The sliding plate 18 has a sliding surface 18B that slidably contacts (slidably contacts) a surface plate 8E provided on the front surface 8A of the left rear support column 8. The sliding surface 18B is formed with a cross-shaped oil groove 18C composed of a vertical groove extending upward and downward and a horizontal groove extending left and right, and the oil groove 18C has a central portion where the vertical groove and the horizontal groove intersect. Are provided with oil holes 18D penetrating in the thickness direction of the sliding plate 18. The oil hole 18 </ b> D communicates with the oil passage 17 </ b> D of the fixture 17 in a state where the sliding plate 18 is fitted to the fitting protrusion 17 </ b> B of the fixture 17.

  The sliding plate 18 is fixed to the sliding plate 18 using bolts 18 </ b> A in a state where the sliding plate 18 is fitted to the fitting projection 17 </ b> B of the fixing tool 17. In this state, the fitting protrusion 17B of the fixture 17 and the sliding plate 18 are inserted into the upper square hole 13G of the rear guide cylinder 13, and the fixture 17 is attached to the front plate 13A of the rear guide cylinder 13 using bolts 17A. By fixing, the sliding surface 18B of the sliding plate 18 can be slidably brought into contact with the surface plate 8E of the left rear support column 8. In this case, the head of the bolt 17A is housed in a counterbore 17C1 provided in the fixture 17, and does not protrude outward from the front surface 17G of the fixture 17. Therefore, a cable / hose guide member 30 described later is provided. Can be arranged at a position close to the rear guide tube 13.

  One end of a greasing hose 19 is connected to the hose connection port 17H provided on the lower end surface 17E of the fixture 17 constituting the upper sliding member 16. The other end of the greasing hose 19 is fixed to a greasing hose bracket 27E provided on an elevating support base 27 described later. The greasing hose 19 is supplied with lubricating oil from a greasing pump (not shown) connected to the other end, and this lubricating oil is supplied to the oil passage 17D of the fixture 17 and the oil hole of the sliding plate 18. It leads to the oil groove 18C through 18D. As a result, the lubricating oil is supplied to the sliding surface between the sliding plate 18 and the front plate 8E of the left rear support column 8.

  A total of eight lower sliding members 20 are provided in each of the lower portions of the rear guide cylinder 13 at the portions facing the left rear support column 8 and the right rear support column 9. Each of the lower sliding members 20 includes a fixture 17 and a sliding plate 18, similarly to the upper sliding member 16 described above, and one end of a greasing hose 19 is connected to the fixture 17. (See FIG. 7). Each upper sliding member 16 and each lower sliding member 20 constitutes a rear guide member 12 together with the rear guide cylinder 13.

  One end of a cable / hose guide member 30 described later is attached below the attachment position of the upper sliding member 16 (position of the upper square hole 13G) at the upper position of the front plate 13A constituting the rear guide cylinder 13. Left and right guide cylinder side brackets 21 as brackets are provided. Here, since the left and right guide cylinder side brackets 21 have the same configuration, the left guide cylinder side bracket 21 will be described.

  As shown in FIGS. 9 to 11, the guide cylinder side bracket 21 is formed by bending a rectangular steel plate material into a substantially U shape. The guide cylinder side bracket 21 is fixed to the front plate 13A below the upper square hole 13G by means of welding or the like, and a greasing hose 19 is provided between the guide cylinder side bracket 21 and the front plate 13A. A hose accommodating space 21A is formed. Thus, the guide cylinder side bracket 21 is fixed to the front plate 13A of the rear guide cylinder 13 in a state of straddling the greasing hose 19 connected to the fixture 17 of the upper sliding member 16. Here, on the surface of the guide tube side bracket 21 that faces the front plate 13A of the rear guide tube 13, four back nuts 21B are fixedly spaced in the upward, downward, left, and right directions, and the guide tube side One end 30 </ b> B of a cable / hose guide member 30 to be described later is attached to the bracket 21.

  A notch portion 21 </ b> C that is recessed downward in a V shape from the upper end edge of the guide tube side bracket 21 is formed at the left and right center portions of the guide tube side bracket 21. As shown in FIG. 11, the notch 21 </ b> C is disposed at a portion corresponding to the greasing hose 19 connected to the fixture 17 of the upper sliding member 16. Accordingly, when the greasing hose 19 is attached to and removed from the hose connection port 17H of the fixture 17 using a tool such as a spanner (not shown), the tool is guided through the notch portion 21C. The hose housing space 21 </ b> A between the tube side bracket 21 and the rear guide tube 13 can be inserted.

  The left front guide member 22 is provided to be engaged with the left front column 10, and moves up and down along the left front column 10. As shown in FIGS. 2 and 3, the left front guide member 22 includes a left front guide cylinder 23 that surrounds the left front support column 10 from the outside, and a plurality of sliding members 24 provided on the left front guide cylinder 23. Has been. Here, the left front guide cylinder 23 is formed of a rectangular cylinder having a square cross section facing the front surface, the rear surface, and the left and right side surfaces of the left front support column 10, and is formed shorter than the height of the rear guide cylinder 13. . The sliding members 24 provided on the front surface, the rear surface, and the left and right side surfaces of the left front guide cylinder 23 are detachably fixed to the left front guide cylinder 23 in the same manner as the upper sliding member 16 constituting the rear guide member 12. 24A, and a sliding plate (not shown) attached to the fixing tool 24A and slidably in contact with the surface plate 10A of the left front support column 10.

  The right front guide member 25 is provided so as to engage with the right front column 11, and moves up and down along the right front column 11. The right front guide member 25 includes a right front guide cylinder 26 that surrounds the right front support column 11 from the outside, and a plurality of sliding members 24 provided on the right front guide cylinder 26. Here, the right front guide cylinder 26 is formed of a rectangular cylinder having a rectangular cross section facing the front, rear and left and right side surfaces of the right front support column 11, and is formed shorter than the height of the rear guide cylinder 13. . A sliding member 24 similar to the left front guide member 22 is provided on the front surface, the rear surface, and the left and right side surfaces of the right front guide tube 26, respectively.

  The elevating support 27 is attached to the rear guide member 12, the left front guide member 22, and the right front guide member 25, and is disposed on the left side of the front portion of the revolving frame 5 so as to be able to move up and down. The elevating support 27 supports the cab 29, and elevates and lowers the cab 29 upward and downward by expanding and contracting an elevating cylinder 28 described later. Here, the elevating support base 27 is formed in a rectangular box shape extending in the front and rear directions surrounded by the upper surface 27A, the front surface 27B, the left side surface 27C, and the right side surface 27D, for example. The rear guide cylinder 13 of the rear guide member 12 is fixed to the rear end portion of the elevating support base 27, and the left front guide cylinder 23 of the left front guide member 22 and the right front guide member 25 are disposed on the front surface 27 </ b> B of the elevating support base 27. The right front guide tube 26 is fixed.

  Therefore, when the elevating cylinder 28 is expanded and contracted to raise and lower the elevating support base 27, the rear guide member 12 guides the elevating support base 27 along the left and right rear struts 8 and 9, and the left front guide member 22 is front left. The elevating support table 27 is guided along the column 10, and the right front guide member 25 guides the elevating support table 27 along the right front column 11. Further, a greasing hose bracket 27E is provided on the left side surface 27D of the lifting support base 27. The greasing hose bracket 27E has one end on the upper sliding member 16 and the lower sliding member 20 of the rear guide member 12. The other end of each greasing hose 19 to which is connected is connected.

  The elevating cylinder 28 is provided between the revolving frame 5 and the rear guide member 12, and elevates the elevating support base 27 upward and downward with respect to the revolving frame 5. The elevating cylinder 28 is constituted by a hydraulic cylinder, a tube 28A, a piston (not shown) inserted into the tube 28A, and a rod having one end fixed to the piston and the other end protruding outside the tube 28A. 28B. The elevating cylinder 28 is disposed between the left rear column 8 and the right rear column 9 in the rear guide cylinder 13 with the tube 28A on the upper side, for example. The tube 28 </ b> A of the elevating cylinder 28 is fixed to the rear guide cylinder 13 via a bracket or the like (not shown), and the tip (lower end) of the rod 28 </ b> B of the elevating cylinder 28 is attached to the revolving frame 5. Accordingly, the rear guide member 12, the left and right front guide members 22 and 25, and the lift support base 27 can be lifted and lowered integrally with the revolving frame 5 by extending and retracting the lift cylinder 28.

  The cab 29 is supported on the upper surface 27 </ b> A of the elevating support base 27 via an anti-vibration mount (not shown). The cab 29 is formed as a box surrounded by an upper surface 29A, a front surface 29B, a rear surface 29C, a left side surface 29D, and a right side surface 29E, and defines a driver's cab in which an operator is boarded. In the cab 29, there are arranged a driver's seat where an operator is seated, a hydraulic pilot type operating device (none of which is shown) for operating the work device 4 and the like. The cab 29 moves up and down between the lowered position shown in FIG. 4 and the raised position shown in FIG.

  A guard member 29G for protecting the skylight 29F from falling objects is provided on the upper surface 29A of the cab 29. The upper end 29H of the guard member 29G is the upper end of the cab 29. Here, as shown in FIG. 12, when the excavator 1 is loaded on the trailer 100 and travels on a public road, the distance from the road surface to the height restriction position is H0, and the distance from the road surface to the upper end 29H of the cab 29 Is H2, the distance H2 is set smaller than the distance H0 (H2 <H0). That is, the upper end 29H of the cab 29 is arranged at a position lower than the height limit during transportation. Since the outer dimension of the cab 29 changes according to the specifications, the distance H2 from the road surface to the upper end 29H of the cab 29 also changes according to the specifications. However, the cab 29 is transported at the upper end 29H regardless of the specifications. It is formed to fit in a position lower than the height limit of time.

  Between the frame side bracket 5A provided on the revolving frame 5 and the cab 29, left and right cable / hose guide members 30 are provided so as to straddle the left and right rear columns 8 and 9 from above. Yes. The cable / hose guide member 30 is a hydraulic hose 31 (see FIG. 4) for supplying pilot pressure to a control valve (not shown) mounted on the revolving frame 5 from a hydraulic pilot type operating device arranged in the cab 29. A cable or the like (not shown) for connecting between the electric device arranged in the cab 29 and the electric device mounted on the turning frame 5 is accommodated. Here, since the left and right cable / hose guide members 30 have the same configuration, the left cable / hose guide member 30 will be described.

  As shown in FIGS. 8 to 10, the cable / hose guide member 30 is formed into a square tube shape having flexibility as a whole by pin-joining a large number of frame bodies 30 </ b> A having a quadrangular cross section. Is formed. When the cab 29 moves up and down between the lowered position shown in FIG. 4 and the raised position shown in FIG. 5, the cable / hose guide member 30 follows the raising / lowering operation of the cab 29 and deforms as shown in the figure. It supports (guides) the hydraulic hose 31, the cable, and the like housed therein so that they can be bent flexibly on a fixed track.

  Here, at one end 30B of the cable / hose guide member 30, four bolt insertion holes 30C corresponding to the respective back nuts 21B of the guide cylinder side bracket 21 are formed, and the bolts inserted into the respective bolt insertion holes 30C. One end 30 </ b> B of the cable / hose guide member 30 is attached to the guide cylinder side bracket 21 by screwing 30 </ b> D to each back nut 21 </ b> B of the guide cylinder side bracket 21. On the other hand, the middle portion in the length direction of the cable / hose guide member 30 is disposed above the left rear column 8, and the other end 30 </ b> E of the cable / hose guide member 30 is disposed on the rear frame of the left rear column 8. It is attached to the frame side bracket 5A erected on the top using bolts or the like.

  Thus, in the present embodiment, the four upper sliding members 16 surrounding the left rear column 8 and the four upper sliding members surrounding the right rear column 9 are located at the upper position of the rear guide cylinder 13. 16 is provided, and a guide cylinder side bracket 21 is provided on the lower side of the front plate 13A of the rear guide cylinder 13 below the mounting position of the upper sliding member 16. Therefore, as shown in FIG. 8 and the like, the one end 30B of the cable / hose guide member 30 can be attached to the guide tube side bracket 21 disposed below the upper sliding member 16. Accordingly, the upper sliding member 16 can be disposed in the vicinity of the upper end of the rear guide cylinder 13, and the distance A between the upper end of the rear guide cylinder 13 and the upper end of the sliding plate 18 is made as small as possible. Can do. As a result, the upper and lower gaps between the upper sliding member 16 and the lower sliding member 20 are secured large, and the rear guide cylinder 13 is moved stably to the upper ends of the left and right rear struts 8 and 9. By doing so, the length of the left and right rear struts 8 and 9 can be used without waste, and a large amount of lifting of the cab 29 can be secured.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. When the hydraulic excavator 1 is loaded on a trailer and transported to a work site, for example, as shown in FIG. The excavator 1 is loaded on the trailer 100 in a state where the working device 4 is detached from the upper swing body 3 and the cab 29 is lowered to the lowered position.

  At this time, the distance H1 from the road surface of the upper ends 8F, 9F of the left and right rear struts 8, 9 provided in the excavator 1 is smaller than the distance H0 from the road surface to the height limit position defined (H1). <H0) The upper ends 8F and 9F of the left and right rear struts 8 and 9 are set within the specified height limit during transportation. Thereby, at the time of transportation of the hydraulic excavator 1 using the trailer 100, the troublesome work of disassembling the left and right rear supports 8 and 9 can be eliminated, and the workability of the transportation work can be improved.

  Next, after the excavator 1 is transported to the work site, the operator M gets on the cab 29 with the work device 4 attached to the upper swing body 3 of the excavator 1. The operator M causes the excavator 1 to self-travel to the work place by a traveling operation device (not shown), and then operates the work device 4 by an operation device (not shown) for the work device 4. Thereby, for example, scrap work such as scrap of construction waste, iron scrap, and the like, which is scooped up by the bucket 4C of the work device 4 can be carried out on the truck bed.

  Here, when the truck bed is at a position higher than the cab 29 in the lowered position, it becomes difficult for the operator M who operates the work device 4 in the cab 29 to see the scrap stacked on the truck bed. In this case, the cab 29 can be displaced from the lowered position to the raised position shown in FIG. 5 by extending the lifting cylinder 28 and lifting the lifting support 27.

  At this time, the upper sliding member 16 and the lower sliding member 20 of the rear guide member 12 attached to the rear side of the lifting support base 27 are lifted along the left rear column 8 and the right rear column 9 to support the lifting. When the sliding member 24 of the left front guide member 22 and the right front guide member 25 attached to the front side of the table 27 rises along the left front column 10 and the right front column 11, the lifting support table 27 is accompanied by the cab 29. It can move stably to the raised position. Thereby, the operator M in the cab 29 can operate the working device 4 while looking down the truck bed from above, and can improve the workability of the scrap work.

  In this case, the excavator 1 according to the present embodiment attaches the upper sliding member 16 to the upper position of the rear guide cylinder 13, and is lower than the mounting position of the upper sliding member 16 in the front plate 13 </ b> A of the rear guide cylinder 13. On the side, a guide cylinder side bracket 21 is provided. As a result, the one end 30 </ b> B of the cable / hose guide member 30 can be attached to the guide tube side bracket 21 disposed below the upper sliding member 16. Accordingly, the upper sliding member 16 can be disposed in the vicinity of the upper end of the rear guide cylinder 13, so that the distance A between the upper end of the sliding plate 18 of the upper sliding member 16 and the upper end of the rear guide cylinder 13 is allowed. It can be made as small as possible (see FIG. 8).

  As a result, the rear guide cylinder 13 provided with the upper sliding member 16 can be stably moved to the vicinity of the upper ends 8F, 9F of the left and right rear columns 8, 9, so that the left, right The lengths of the rear struts 8 and 9 can be used without waste, and a large amount of lift (up and down stroke) of the cab 29 can be ensured. Accordingly, the viewpoint of the operator in the cab 29 can be set to a higher position while the cab 29 is moved to the raised position, and the workability of scrap work can be further enhanced.

  Moreover, the upper sliding member 16 is detachably fixed to the rear guide tube 13 and is attached to the fixing member 17 and is slid on the surface plates 8E and 9E of the left and right rear struts 8 and 9. The sliding plate 18 is movably abutted, and the lower end of the fixture 17 is provided with lubricating oil on the sliding surface between the sliding plate 18 and the surface plates 8E and 9E of the left and right rear struts 8 and 9. Is connected to the greasing hose 19 for supplying the oil. On this, since the guide cylinder side bracket 21 straddling the greasing hose 19 connected to the fixture 17 is provided at the upper position of the rear guide cylinder 13 and below the attachment position of the upper sliding member 16, this guide cylinder side bracket 21 is provided. By attaching one end 30 </ b> B of the cable / hose guide member 30 to the guide tube side bracket 21, the one end 30 </ b> B of the cable / hose guide member 30 can be disposed below the attachment position of the upper sliding member 16.

  Further, the guide cylinder side bracket 21 provided in the rear guide cylinder 13 has a notch 21C that is recessed in a V shape in a portion corresponding to the greasing hose 19 connected to the fixture 17 of the upper sliding member 16. Is formed. Thus, when the greasing hose 19 is attached to and removed from the hose connection port 17H provided on the lower end surface 17E of the fixture 17 using a tool (not shown) such as a spanner, the tool is cut off. It can be inserted into the hose accommodating space 21A formed between the guide cylinder side bracket 21 and the rear guide cylinder 13 through the notch portion 21C. As a result, the greasing hose 19 can be quickly and easily attached to and detached from the hose connection port 17H of the fixture 17.

  In the embodiment, the upper ends 8F and 9F of the left and right rear struts 8 and 9 are illustrated at positions lower than the upper end 29H of the cab 29. However, the present invention is not limited to this. If the upper ends 8F and 9F of the left and right rear struts 8 and 9 are arranged at positions lower than the height limit during transportation, The upper ends 8F and 9F of the columns 8 and 9 may be arranged at a position higher than the upper end 29H of the cab 29.

  Further, in the embodiment, two rear struts including the left rear strut 8 and the right rear strut 9 are provided on the rear side of the cab 29 with left and right intervals, and the left front strut 10 is disposed on the front side of the cab 29. In addition, a case where two front columns including the right front column 11 are erected is illustrated. However, the present invention is not limited to this. For example, three or more rear struts and front struts may be provided.

  Furthermore, in the embodiment, the hydraulic excavator 1 having the crawler type lower traveling body 2 is exemplified, but the present invention is not limited to this, and can be widely applied to other construction machines such as a wheel type hydraulic excavator. Can do.

5 Turning frame (body frame)
8 Left rear support (support)
8F, 9F Upper end 9 Right rear support (support)
10 Left front support (support)
11 Right front strut
12 Rear guide member (guide member)
13 Rear guide tube (guide tube)
16 Upper sliding member (sliding member)
17, 24A Fixing tool 18 Sliding plate 19 Grease hose 21 Guide cylinder side bracket 21C Notch 22 Front left guide member (guide member)
23 Front left guide tube (guide tube)
24 Sliding member 25 Right front guide member (guide member)
27 Lifting support base 28 Lifting cylinder 29 Cab 29H Upper end 30 Cable / hose guide member 30B One end

Claims (3)

A body frame forming a support structure;
Left to the body frame, right and front, top is erected at intervals in the rear direction, and a plurality of struts extending downwardly,
A guide member that engages with and is raised and lowered along the column;
An elevating support base attached to the guide member;
An elevating cylinder provided between the vehicle body frame and the guide member and elevating the elevating support base;
A cab that is supported by the elevating support and defines a cab;
One end is attached to the guide member and the other end is attached to the vehicle body frame side, and includes a cable / hose guide member that is deformed according to the raising / lowering operation of the elevation support base,
The guide member includes a guide cylinder that is provided so as to surround the support column from the outside, and a sliding member that is provided on the guide tube and that slidably contacts the surface of the support column and guides the guide tube. In a construction machine composed of
The upper end of the column is arranged at a position lower than the height limit during transportation,
The sliding member of the guide member is disposed at two locations, an upper position and a lower position of the guide cylinder,
A construction machine characterized in that one end of the cable / hose guide member is attached to the guide cylinder at a position lower than an attachment position of an upper sliding member arranged at an upper position of the guide cylinder. The sliding member includes a fixture that is detachably fixed to the guide tube, and a sliding plate that is provided on the fixture and that slidably contacts the surface of the support column.
The lower end of the fixture is configured to connect a greasing hose for supplying lubricating oil to the sliding surfaces of the sliding plate and the support column,
A bracket is provided at the upper position of the guide tube and below the mounting position of the upper sliding member so as to straddle the greasing hose connected to the fixture and to which one end of the cable / hose guide member is mounted. The construction machine according to claim 1, which is configured.   The construction machine according to claim 2, wherein the bracket is provided with a notch for inserting a tool for attaching and removing the greasing hose to the fixture of the sliding member.

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