JP2005061061A - Construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a hose from projecting a great deal from a front by providing the front with a hose guide. <P>SOLUTION: The tip side of the front 8 is provided with a grapple 11 driven by an attachment driving cylinder 15. Each hose 27 for the cylinder 15 is arranged flexurally deformed to straddle piping 20 for cylinders 13, 14 and connected to piping 21, 25 by a rotary joint 22 and a bent joint 26. An upper face part 9A of a boom 9 is provided with the hose guide 28, and the hose 27 is guided by a guide roller 32 so as to be pressed to the boom 9 side. Consequently, when the front 8 moves downward, the hose 27 can be held in a lower position than a cab 5, and conveying work or the like of a vehicle can be smoothly performed. When the front 8 moves upward, hose 27 can be prevented from interfering with an on-vehicle structure or the like on the rear side of the front 8. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a construction machine that is suitably used as, for example, a hydraulic excavator or the like and includes a work tool such as a bucket, a grapple, or a lifting magnet.

  There is a hydraulic excavator as a typical construction machine. This hydraulic excavator includes a front made up of a bucket for excavation, an arm for moving the bucket to a desired position, and a boom. The front is further provided with hydraulic cylinders for operating the bucket, the arm, and the boom, respectively. The pressure oil supply / discharge piping from the hydraulic source to these hydraulic cylinders has a width on the upper surface side of the boom, for example. They are juxtaposed in the direction (see, for example, Patent Document 1).

JP-A-10-88616

  In the hydraulic excavator described above, depending on the situation at the work site, the excavation bucket may be removed from the front end, and for example, a grapple may be attached to the front end.

  In such a case, a supply / exhaust pipe for operating the grapple will be attached. However, this supply / exhaust pipe is added to the existing supply / exhaust pipe, making it difficult to lay out the hydraulic system. The shape of the piping is likely to be complicated.

  Therefore, in the prior art, the newly added supply / exhaust pipes are arranged in a state of being bent and deformed in a convex curve so as to straddle the existing supply / exhaust pipes. It is necessary to have a configuration that avoids interference with the exhaust pipe.

  However, hydraulic excavators are sometimes transported by a trailer, etc., with the working device swung down as much as possible, and depending on the type of hydraulic excavator, new supply / discharge piping may be used. There is a case where it is held at a position higher than the upper surface side.

  For this reason, in the prior art, when a hydraulic excavator is transported, the height of the entire vehicle including the new supply / exhaust piping may exceed the height limit defined by traffic regulations, etc. There is a problem that the work cannot be performed smoothly.

  Further, for example, when the working device is greatly lifted, a new supply / discharge pipe protrudes rearward from the upper surface of the boom that has risen to a position close to vertical. For this reason, for example, when there is another on-vehicle structure on the rear side of the work apparatus, there is also a problem that this structure and the new supply / exhaust pipe easily interfere with each other.

  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 prevent the supply / exhaust pipe from being bent and deformed into a convex curve and protruding greatly outward from the upper surface of the front. It is an object of the present invention to provide a construction machine that can guide the supply / discharge piping well along the front, and can smoothly carry and layout the vehicle.

  In order to solve the above-mentioned problems, the present invention includes a revolving body on which a hydraulic power source is mounted, and a front which is provided on the revolving body so as to be able to move up and down and is operated by an actuator. It is applied to a construction machine that can be equipped with a work tool.

  The features of the configuration adopted by the invention of claim 1 are: piping arranged on the revolving body side and connected to a hydraulic source; piping arranged on the upper surface side of the front and connected to the actuator for the work tool; A configuration comprising: a flexible hose connected between the pipes; and a hose guide provided on the upper surface of the front so as to regulate an amount of bending deformation outward from the upper surface of the front of the hose. It is to have done.

  According to the invention of claim 2, the hose guide is configured to hold the height position of the hose at a position lower than the upper surface side of the cab provided in the revolving body when the front is swung.

  Moreover, according to invention of Claim 3, it is set as the structure which provides the rotary joint which connects these rotatably to piping and hose by the side of a turning body.

  According to a fourth aspect of the present invention, the hose guide is supported by the support portion protruding upward from the front and rotatably supported at a position away from the front by the support portion, and the hose can be moved in the length direction. The hose is configured to be inserted between the front and the guide roller.

  According to the invention of claim 5, the front has a boom whose base end is connected to the revolving body and is lifted by a boom cylinder, an arm connected to the tip of the boom and lifted by an arm cylinder, The hose guide is located on the upper surface side of the boom and is connected to the other actuator. The hose is guided.

  According to the first aspect of the present invention, the front is provided with the hose guide that restricts the hose from being bent and deformed outward from the upper surface of the front. The hose guide can guide the hose so that it is pressed from the upper side toward the front when the hose is bent up and down following the raising and lowering operation of the front, and can regulate the amount of deformation of the hose outward. At the same time, the hose can be prevented from protruding greatly from the front.

  Therefore, the hose guide reliably prevents the hose from projecting to a higher position than the revolving body even when the front is swinging, or from greatly projecting from the front to the rear when the front is lifted. be able to. As a result, for example, the hose can be prevented from coming into contact with an obstacle or the like above, or the hose can be in conflict with the vehicle height restriction due to traffic regulations, etc. during transportation of the vehicle, and the transportation operation of the vehicle can be performed smoothly. be able to. In addition, various on-vehicle structures can be arranged compactly on the rear side of the front without interfering with the hose, and vehicle layout design and the like can be easily performed.

  For example, when the hose guide is provided on the revolving unit side, when the front is suddenly lifted or swinged, the hose displaced together with the hose guide may collide with the hose guide on the revolving unit side. . However, by providing the hose guide at the front, they can be moved up and down together, and the hose displaced together with the front can be stably brought into contact with the hose guide. Thereby, a collision with a hose and a hose guide can be prevented, and durability can be improved.

  Further, according to the invention of claim 2, since the hose guide is configured to hold the height position of the hose at a position lower than the upper surface side of the cab provided in the revolving body when the front is swung. For example, when carrying out construction work or the like of a construction machine, the hose can be held at a position lower than the upper surface side of the cab. Thereby, it is possible to surely prevent the hose from conflicting with the vehicle height restriction due to traffic laws and the like, and to carry out the transportation work and the like smoothly.

  Further, according to the invention of claim 3, since the rotary joint is provided between the pipe on the revolving structure side and the hose, the rotary joint follows the front elevation operation, and the posture of the hose (deflection shape). Can be rotated together with the end side of the hose, and the change in the hose posture can be absorbed. Thereby, it is possible to prevent an excessive bending force or the like from being applied to the hose and to protect the hose.

  According to the invention of claim 4, since the hose guide is constituted by the support portion protruding upward from the front and the guide roller rotatably supported by the support portion, the hose guide moves up and down. Even when the hose moves in the length direction, the guide roller can be moved in the length direction while guiding it by rotating without rubbing against the hose. For this reason, it can prevent that a hose slides and wears with a guide roller.

  According to a fifth aspect of the present invention, the front is provided with a work tool that performs a work operation using another actuator different from the boom cylinder, the arm cylinder, and the work tool cylinder, and the hose guide is connected to the other actuator. Since the hose is guided, a plurality of pipes, hoses and the like for supplying and discharging pressure oil to, for example, a boom cylinder, an arm cylinder, and a work tool cylinder can be arranged on the front.

  In addition, when mounting a work implement equipped with another actuator different from these cylinders on the front, the hose for the actuator is placed so as to straddle the piping of each cylinder in a state of being bent upward and deformed, for example. can do. Even in the state where the hose for the actuator is arranged in this way, it can be guided by the hose guide so that the hose does not bend excessively upward, and the bending shape of the hose can be adjusted appropriately.

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

  First, FIG. 1 to FIG. 7 show a first embodiment. In this embodiment, a case where a grapple is attached to a hydraulic excavator will be described as an example.

  Reference numeral 1 denotes a hydraulic excavator, and the hydraulic excavator 1 includes a lower traveling body 2, an upper revolving body 3 that is turnably mounted on the lower traveling body 2, and a front 8 that will be described later. The revolving frame 4 of the upper revolving structure 3 is provided with a cab 5 in which a driver's seat is arranged, a building cover 6 in which a hydraulic pump 17 and a control valve 18 described later are accommodated, and a counterweight 7. Yes.

  Here, as shown in FIGS. 2 to 4, the revolving frame 4 is composed of a plurality of steel plates and the like, and is provided with a bottom plate 4A extending in the horizontal direction and standing on the bottom plate 4A and extending in the front and rear directions of the vehicle body. It includes a pair of vertical plates 4B, 4B arranged at intervals in the left and right directions (the width direction of the vehicle body), and a front horizontal plate 4C that is positioned between the vertical plates 4B and closes the front side position. It is configured.

  8 is a front provided on the front side of the revolving frame 4 so as to be able to move up and down. As shown in FIG. 1, the front 8 includes a boom 9 whose base end is connected to the revolving frame 4 so as to be able to be raised and lowered; An arm 10 connected to the distal end side of the boom 9 so as to be able to move up and down, and a working tool rotatably connected to the distal end side of the arm 10 instead of a bucket (not shown) which is a standard working tool. A grapple 11 (attachment) and cylinders 12, 13, 14, 15 and the like to be described later are configured.

  Here, the boom 9 is formed, for example, as an elongated hollow structure having a rectangular cross section having an upper surface portion 9A, a lower surface portion 9B, and left and right side surface portions 9C, and is moved up and down by the boom cylinder 12. Further, the arm 10 is moved up and down by an arm cylinder 13, and the grapple 11 is rotated by a bucket cylinder 14 as a work tool cylinder. Further, the grapple 11 is provided with an attachment drive cylinder 15 as another actuator different from these cylinders 12, 13, and 14. The attachment drive cylinder 15 opens and closes each fork 11A of the grapple 11 to perform various operations. The work operation is performed.

  Reference numeral 16 denotes an engine disposed in the building cover 6, and 17 denotes a hydraulic pump as a hydraulic source driven by the engine 16. The hydraulic pump 17 includes a vehicle travel motor, a turning motor, and each cylinder 12, 13, 14. , 15 to supply pressure oil to a plurality of actuators.

  A control valve 18 is provided on the revolving frame 4 and is located on the rear side of the front 8. The control valve 18 is connected to the arm cylinder 13 and the bucket cylinder 14 via a hose 19 and a front side pipe 20, which will be described later. It is connected. In the state where the grapple 11 is attached to the excavator 1, the control valve 18 is also connected to the attachment drive cylinder 15 via pipes 21 and 25, a hose 27, and the like which will be described later. And the control valve 18 controls the supply state of the pressure oil with respect to these actuators according to the driving | operation operation of the operator of a vehicle.

  Here, as a hydraulic system for the front 8, a standard hose 19 and a front side pipe 20 used for operation of a bucket and the like will be described first.

  Reference numeral 19 denotes, for example, four hoses connected to the control valve 18 in order to operate the arm cylinder 13 and the bucket cylinder 14, and two of the hoses 19 are as shown in FIGS. Pressure oil is supplied to and discharged from the arm cylinder 13 through the front side pipe 20, and the other two hoses 19 are used to supply and discharge pressure oil to the bucket cylinder 14 through different front side pipes 20. In this case, hoses, pipes (not shown) and the like for the boom cylinder 12 are disposed on the lower surface portion 9B, the side surface portion 9C, and the like of the boom 9, for example.

  Reference numeral 20 denotes, for example, four front-side pipes provided on the upper surface portion 9A of the boom 9. Two of the front-side pipes 20 are connected to the arm cylinder 13, and the other two pipes 20 are It is connected to the bucket cylinder 14. These front-side pipes 20 are fixed to the upper surface portion 9 </ b> A of the boom 9 in a left and right direction using brackets or the like, and extend forward and rearward along the boom 9.

  Next, the pipes 21 and 25 connected to the attachment drive cylinder 15, the hose 27, and the like will be described as a hydraulic system added when a work tool such as the grapple 11 is attached to the front 8.

  Reference numeral 21 denotes, for example, two vehicle body side pipes provided on the turning frame 4. Each of the vehicle body side pipes 21 is made of, for example, a rigid metal pipe or the like as shown in FIGS. The side is located between the vertical plates 4B of the revolving frame 4 and attached to the bottom plate 4A, and this portion is connected to the control valve 18.

  The other side of the vehicle body side pipe 21 is provided with a bent pipe portion 21A bent in the horizontal direction along the front lateral plate 4C while being bent upward so as to rise from the bottom plate 4A. 21A is attached to the front horizontal plate 4C at a position close to the base end side of the boom 9 using a bracket 21B (see FIG. 4) or the like. The other end side of the vehicle body side pipe 21 is rotatably connected to a hose 27 via a rotary joint 22 described later, and is connected to the attachment drive cylinder 15 via a front side pipe 25.

  Reference numeral 22 denotes a rotary joint provided between each vehicle body side pipe 21 and the hose 27. Each rotary joint 22 is connected to a bent pipe portion 21A of the vehicle body side pipe 21 as shown in FIG. A substantially cylindrical pipe-side joint 23 attached to the front horizontal plate 4C of the swivel frame 4 together with the portion 21A, and a pipe that is rotatably inserted into the outer peripheral side of the pipe-side joint 23 and connected to the hose 27. It is comprised by the cylindrical hose side coupling 24. FIG.

  Here, the pipe-side joint 23 is provided with an oil passage 23 </ b> A located on the inner peripheral side thereof and a radial communication hole 23 </ b> B that allows the oil passage 23 </ b> A to communicate with the outer peripheral side of the joint 23. Further, the hose side joint 24 has an annular concave groove 24A that is located on the inner peripheral side and surrounds the communication hole 23B of the pipe side joint 23 from the radially outer side, and extends radially outward from the concave groove 24A. An oil passage 24B is provided.

  In this case, the rotary joint 22 rotatably connects the vehicle body side pipe 21 and the hose 27 when pressure oil flows between the passages 23A and 24B, and the rotation axis of the rotary joint 22 is the center when the boom 9 moves up and down. It is arranged parallel to the axis. Then, when the posture (deflection shape) of the hose 27 changes following the lifting operation of the boom 9, the rotary joint 22 rotates together with the end side of the hose 27 when the hose side joint 24 rotates. It is configured to prevent an excessive bending force or the like from being applied to the end portion side of 27 and to extend it in a natural direction.

  Reference numeral 25 denotes other two front side pipes provided on the upper surface portion 9 </ b> A of the boom 9 together with the front side pipes 20, and each front side pipe 25 is connected to the attachment drive cylinder 15.

  Reference numeral 26 denotes a bent joint provided between each front side pipe 25 and the hose 27. Each bent joint 26 is made of, for example, a metal tube bent in a substantially L shape, and its base end side is the front side. It is connected to the pipe 25 and is attached to the upper surface portion 9 </ b> A of the boom 9 through the pipe 25. The bent joint 26 rises substantially vertically from the upper surface portion 9A of the boom 9 and bends in an L shape toward the rear side of the vehicle body. A hose 27 is connected to the distal end side of the bent joint 26. Thereby, the bending joint 26 holds the hose 27 at a position away from the upper surface portion 9 </ b> A of the boom 9.

  Reference numeral 27 denotes, for example, two hoses provided between the vehicle body side pipes 21 and the front side pipes 25. The respective hoses 27 are formed with flexibility, and pressure oil from the hydraulic pump 17 is attached to the attachment drive cylinder 15. It is something to supply and discharge. The hose 27 is composed of, for example, a hydraulic hose that can be bent and deformed while maintaining a certain degree of rigidity, and one end side thereof is connected to the bent pipe portion 21A of the vehicle body side pipe 21 via the rotary joint 22, and the like. The end side is connected to the front side pipe 25 via the bending joint 26.

  Here, the length of the hose 27 is formed to be long with respect to the shortest distance when the hose is routed between the rotary joint 22 and the bending joint 26, for example, and interferes with the boom 9 and the like when the front 8 is raised and lowered. It has a predetermined deflection allowance. Further, the other end side of the hose 27 is held at a position away from the upper surface portion 9 </ b> A of the boom 9 by the bending joint 26. With these configurations, the hose 27 is held in a state of being bent and deformed in a convex shape upward, and is used for the cylinders 13 and 14 from the front horizontal plate 4C side of the swivel frame 4 to the upper surface portion 9A side of the boom 9. While extending so as to go around each front side pipe 20, the front side plate 4 </ b> C, the boom 9, and each pipe 20 are held at positions away from each other.

  28 is a hose guide located on the base end side of the boom 9 and provided on the upper surface portion 9A. The hose guide 28 includes a post 29, a bearing 31, a guide roller 32, etc., which will be described later, as shown in FIGS. It is comprised by. The hose guide 28 regulates the amount of deformation within a certain range when the hose 27 is bent and deformed in a convex curve shape outward (upward or rearward) from the upper surface portion 9A of the boom 9. is there.

  Reference numeral 29 denotes, for example, two struts as support portions provided upright on the upper surface portion 9A of the boom 9. Each of the struts 29 is made of, for example, an elongated metal material, and the width direction of the vehicle body (left and right in FIG. 4). (Direction). Each strut 29 has a base end side fixed to the upper surface portion 9A substantially perpendicularly to the boom 9 by means of welding or the like, and a distal end side that protrudes above these through the hose 19.

  Further, a bearing mounting plate 30 bent in a substantially L shape is fixed to the front end side of the support column 29 by screwing or the like, and a bearing 31 is mounted on the bearing mounting plate 30.

  Reference numeral 32 is a guide roller provided on the tip side of each column 29, and the guide roller 32 is formed in a long and narrow cylindrical shape with a material such as metal, resin, rubber, etc., and both sides in the axial direction are bearing 31 by each column 29. And is attached to a position away from the upper surface portion 9A of the boom 9. In this case, the rotation shaft of the guide roller 32 extends in a direction (in the width direction of the vehicle body) substantially orthogonal to the length direction of the hose 27.

  Further, as shown in FIG. 2, the height of the guide roller 32 is set to a position lower than the upper surface side of the cab 5 in a state where the front 8 is swung, for example. It is located between the upper surface portion 9 </ b> A of the boom 9 and the guide roller 32. The guide roller 32 is in contact with each hose 27 so as to be able to roll from the upper side, and holds the hose 27 at a position lower than the upper surface side of the cab 5 when the front 8 swings. .

  In this way, the hose guide 28 guides the hose 27 toward the lower side (the boom 9 side) by pressing each hose 27 from the upper side by the guide roller 32. The hose guide 28 protrudes from the boom 9 to the rear side when the hose 27 protrudes to a position higher than the cab 5 even when the front 8 swings. This is to prevent this.

  Further, when the boom 9 moves up and down, the posture of each hose 27 changes following this, and the hose 27 may move forward and backward with respect to the guide roller 32. At this time, the guide roller 32 is rotated through the bearing 31 so as to maintain a contact state without rubbing against the hose 27, and the hose 27 can be moved in the length direction (forward and backward). It is configured to guide.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, when the engine 16 of the excavator 1 is operated, pressure oil is supplied from the hydraulic pump 17 to the control valve 18, and this pressure oil is supplied to and discharged from each hydraulic actuator according to the operation of the operator. As a result, the operator grips various materials, scraps, etc. by rotating the grapple 11 while opening and closing the boom 9 and the arm 10 of the front 8 and opening and closing the fork 11A of the grapple 11. Thus, these transportation operations and the like can be performed.

  Further, when the boom 9 moves up and down, the hoses 19 and 27 are bent and deformed between the turning frame 4 and the boom 9 according to the posture thereof, so that the control valve 18 (vehicle body side piping 21) and the front side piping are provided. 20 and 25 are kept connected.

  In this case, when the front 8 is lifted as shown in FIG. 1, the boom 9 rises upward, so that the hose 27 tends to bend and deform in a convex curve from the upper surface portion 9 </ b> A of the boom 9 to the rear side. To do. However, the hose guide 28 can prevent such bending deformation of the hose 27 toward the rear side.

  Further, when the front 8 is lifted as shown in FIG. 2, when the boom 9 is tilted forward, the hose 27 tends to bend and deform in a convex curved shape upward from the upper surface portion 9 </ b> A of the boom 9. However, the hose guide 28 can hold the hose 27 at a position lower than the cab 5 by restricting the bending deformation of the hose 27 upward. For this reason, for example, the hose 27 is prevented from coming into contact with an upper obstacle or the like during the operation of the hydraulic excavator 1, or the hose 27 violating the vehicle height restriction due to traffic regulations or the like when transporting the vehicle. be able to.

  Thus, according to the present embodiment, since the hose guide 28 is provided on the upper surface portion 9A of the boom 9, the hose 27 for the attachment drive cylinder 15 can be pressed toward the boom 9 from above by the hose guide 28. The hose 27 can be guided well at a position along the length direction of the boom 9.

  Thereby, when the front 8 is swung, the hose 27 can be held at a position lower than the cab 5 by the hose guide 28, and the work using the grapple 11 and the like and the transport work of the hydraulic excavator 1 can be performed smoothly. Therefore, when the vehicle is transported, for example, it is not necessary to force the hose to the vehicle body side and fix it at a low position by using a rope or the like as in the prior art, and the hose 27 is protected from an excessive bending force or the like. Can do.

  Further, when the front 8 is lifted, the hose guide 28 can regulate the amount of bending deformation of the hose 27 to the rear side. For this reason, for example, even if various on-vehicle structures are arranged on the rear side of the front 8, it is not necessary to contact them with the hose 27. Therefore, the space on the rear side of the front 8 is used as an arrangement space for other structures. It can be used effectively, and vehicle layout design can be easily performed.

  For example, when the hose guide is provided on the vehicle body side, when the boom 9 is suddenly lifted or swinged, the hose that is displaced together with the boom 9 may collide with the hose guide or the like on the vehicle body side. is there.

  However, in this embodiment, since the hose guide 28 is provided on the upper surface portion 9A of the boom 9, they can be moved up and down together. For this reason, the hose 27 which is displaced together with the boom 9 can always be stably brought into contact with the hose guide 28, and these collisions can be prevented and the durability of the hose 27 can be enhanced.

  Further, since the hose guide 28 includes the rotatable guide roller 32, the guide roller 32 does not rub against the hose 27 even when the hose 27 moves in the length direction according to the raising / lowering operation of the front 8. By rotating, it can be freely moved along the length direction while guiding this. For this reason, it is possible to prevent the hose 27 from sliding and wearing with the guide roller 32.

  In this case, since each support column 29 is erected on both sides of the guide roller 32, the guide roller 32 can be stably supported at two locations on both sides in the axial direction. Further, each hose 27 can be inserted into a space surrounded by these support columns 29, guide rollers 32, and booms 9, and it is possible to restrict the hose 27 from coming off the guide rollers 32 in the left and right directions. it can.

  Further, since the rotary joint 22 is provided between each vehicle body side pipe 21 and the hose 27, when the posture of the hose 27 changes following the elevation operation of the front 8, the hose side joint 24 is connected to the end of the hose 27. It can be rotated to a reasonable angle together with the part side. Thereby, the posture change of the hose 27 can be absorbed by the rotary joint 22, and the bending force applied to the hose 27 can be reduced.

  Further, since the bent joint 26 is provided between the front side pipe 25 and the hose 27, the hose 27 can be held at a position separated from the upper surface portion 9A of the boom 9 by the bent joint 26, and these contacts are prevented. Can do.

  Thus, in the present embodiment, even when the grapple 11 is mounted on the hydraulic excavator 1, each hose 27 for the attachment drive cylinder 15 is straddled across the front side pipe 20 for the arm cylinder 13 and the bucket cylinder 14. Can be arranged. And in this arrangement | positioning state, the bending shape of the hose 27 can be appropriately adjusted with the hose guide 28 so that each hose 27 may not bend too much upwards.

  Next, FIG. 8 and FIG. 9 show a second embodiment according to the present invention, and the feature of this embodiment is that it is applied to a hydraulic excavator equipped with a lifting magnet. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 41 denotes a hydraulic excavator. The hydraulic excavator 41 includes a lower traveling body 2, an upper swing body 3, a front 8, and the like. A lifting magnet 43 (described later) is attached to the front end side of the front 8. . For this reason, the generator 42 is mounted on the upper swing body 3 so as to be located on the rear side of the front 8.

  Reference numeral 43 denotes a lifting magnet rotatably connected to the distal end side of the arm 10, and the lifting magnet 43 is configured using, for example, an electromagnet or the like, and is fed with power from the generator 42 via an electric wire (not shown) or the like. This generates magnetic force, and adsorbs and transports steel materials, iron scraps, and the like.

  Further, as shown in FIG. 9, the upper-part turning body 3 is provided with a vehicle body side pipe 44, a rotary joint 45, a front side pipe 46, a bent joint 47, a hose 48, and the like, as in the first embodiment. The hose 48 is guided by a hose guide 28.

  However, the hose 48 and the like are used in a hydraulic system of an actuator different from that of the first embodiment, and are configured to supply and discharge pressure oil to, for example, either the arm cylinder 13 or the bucket cylinder 14.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in the present embodiment, even in the hydraulic excavator 41 provided with the lifting magnet 43, the hose guide 28 ensures that the hose 48 protrudes rearward from the boom 9 when the front 8 is greatly lifted. Can be prevented.

  Thereby, the generator 42 for the magnet 43 can be compactly arranged on the rear side of the front 8 without interfering with the hose 48, the space of the upper swing body 3 can be effectively used, and the layout design of the vehicle is easy. Can be done.

  In the embodiment described above, the support 29 of the hose guide 28 is erected on the upper surface portion 9 </ b> A of the boom 9. However, the present invention is not limited to this, and for example, a support portion of the hose guide may be attached to the left and right side surface portions 9C of the boom 9 so that these support portions protrude above the upper surface portion 9A.

  Moreover, in embodiment, the grapple 11 and the lifting magnet 43 were illustrated as a working tool. However, the present invention is not limited to this, and may be applied to a bucket 51 that performs excavation work such as earth and sand as in a modification shown in FIG. The present invention can also be applied to clamshell buckets used for riverbed dredging work, breakers for crushing road surfaces, rocks, etc., tampers for tamping the ground, etc. by vibration.

  Further, in the embodiment, the front 8 including the boom 9, the arm 10, and the like has been described as an example. However, the present invention is not limited to this. For example, a front in which a third boom (or an arm) is connected to the distal end side of the first boom via a second boom, or a plurality of booms extend and contract in the length direction. It can also be applied to telescopic fronts that have become possible.

1 is a front view showing a hydraulic excavator according to a first embodiment of the present invention. FIG. 2 is an enlarged front view of a main part of a hydraulic excavator showing a vehicle body side pipe, a hose, a front side pipe, a hose guide and the like in FIG. FIG. 3 is an enlarged plan view of a main part of the excavator as viewed from above in FIG. 2. It is the principal part expanded sectional view of the hydraulic shovel expanded from the arrow IV-IV direction in FIG. FIG. 5 is an enlarged cross-sectional view of a hose guide and the like as seen from the direction of arrows V-V in FIG. 4. It is an expanded sectional view of the rotary joint seen from the arrow VI-VI direction in FIG. It is a principal part enlarged front view which shows the state of a hose etc. when a front is lifted. It is a front view which shows the hydraulic shovel by the 2nd Embodiment of this invention. It is a principal part enlarged front view which shows the positional relationship of a hose and a generator when a front is lifted. It is a front view which shows the hydraulic shovel by the modification of this invention.

Explanation of symbols

1,41 Hydraulic excavator (Construction machine)
2 Lower traveling body 3 Upper revolving body (revolving body)
5 cab 8 front 9 boom 9A top surface 10 arm 11 grapple (working tool)
12 Boom cylinder 13 Arm cylinder 14 Bucket cylinder (work implement cylinder)
15 Attachment drive cylinder (other actuators)
17 Hydraulic pump (hydraulic power source)
18 Control valve 21, 44 Car body side piping 21A Bending pipe portion 21B Bracket 22, 45 Rotary joint 23 Piping side joint 24 Hose side coupling 25, 46 Front side piping 26, 47 Bending joint 27, 48 Hose 28 Hose guide 29 Support (support) Part)
30 Bearing mounting plate 31 Bearing 32 Guide roller 42 Generator 43 Lifting magnet (working tool)
51 bucket (work implement)

Claims (5)

In a construction machine comprising a swinging body on which a hydraulic power source is mounted, and a front that is provided on the swinging body so as to be movable up and down and that is actuated by an actuator. ,
A pipe disposed on the revolving body side and connected to the hydraulic pressure source, a pipe disposed on the upper surface side of the front and connected to the actuator for the work tool, and a flexible pipe connected between the pipes A construction machine comprising: a hose having a characteristic and a hose guide provided on an upper surface of the front so as to regulate an amount of bending deformation outward from an upper surface of the front of the hose.   The construction machine according to claim 1, wherein the hose guide is configured to hold a height position of the hose at a position lower than an upper surface side of a cab provided in the revolving body when the front is swung.   The construction machine according to claim 1 or 2, wherein a rotary joint is provided between the pipe on the revolving structure side and the hose so as to be rotatably connected thereto.   The hose guide is a support portion that protrudes upward from the front, and a guide roller that is rotatably supported by the support portion at a position away from the front and guides the hose in a state in which the hose can move in the length direction. The construction machine according to claim 1, 2 or 3, wherein the hose is inserted between the front and the guide roller.   The front has a base end connected to the revolving body and is lifted and raised by a boom cylinder, an arm connected to the tip of the boom and lifted and lowered by an arm cylinder, and connected to the tip of the arm. The hose guide is located on the upper surface side of the boom and guides a hose connected to the other actuator. The construction machine according to claim 1, 2, 3, or 4.

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