Work machine equipped with a pipe protection unit

Abstract

To provide a pipe protection unit which can protect a low pressure pipe in a work machine.SOLUTION: A pipe protection unit includes: at least one inside low pressure pipe 30 which is a hydraulic pipe arranged along an attachment side face that is one of a left side face 221 and a right side face 222 of a work attachment 20; at least one outside high pressure pipe 40 which is arranged along the attachment side face outside at least the one inside low pressure pipe 30, and has an outer diameter larger than that of at least the one inside low pressure pipe 30; and a cover plate 50 which is arranged along the attachment side face so as to be interposed between at least the one inside low pressure pipe 30 and at least the one outside high pressure pipe 40, is supported on the work attachment 20, and covers at least a part of at least the one inside low pressure pipe 30.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present disclosure relates to a piping protection unit in a working machine.

Background Art

[0002] A working machine generally includes a base machine that can travel on the ground and a working attachment attached to the base machine. The working attachment includes a boom that is attached to the base machine so as to be able to rise and fall, an arm that is rotatably attached to the tip of the boom, a tip working device attached to the tip of the arm, and a plurality of cylinders for operating the boom, the arm, and the tip working device.

[0003] For example, Patent Documents 1 to 3 disclose a working machine for performing work at a high place away from the ground, such as a building demolition work. In these working machines, a plurality of piping circuits are arranged along the working attachment, and hydraulic oil is supplied to the plurality of cylinders through the plurality of piping circuits. The plurality of piping circuits for supplying hydraulic oil to the plurality of cylinders are high-pressure piping circuits having a strength capable of withstanding a large pressure of hydraulic oil corresponding to a large load during work by the working attachment.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] Incidentally, not only the high-pressure piping circuit as described above is arranged along the work attachment, but also a low-pressure piping circuit may be arranged along the work attachment. Examples of the low-pressure piping circuit include a low-pressure piping circuit for supplying hydraulic oil to a quick hitch, which is a device for replacing some of the plurality of components constituting the work attachment, and a low-pressure piping circuit for supplying hydraulic oil to a device for inserting and removing a pin for connecting two adjacent components among the plurality of components constituting the work attachment. Since the low-pressure piping circuit does not require the pressure resistance like the high-pressure piping circuit, its outer diameter is smaller and its strength is lower than that of the high-pressure piping circuit. Therefore, it is desirable to take measures to protect the low-pressure piping circuit from the impact that may be applied to the low-pressure piping circuit during operations such as disassembling work by the work machine.

[0006] Further, when the work attachment is relatively large, the work attachment is configured to be divisible into a plurality of attachment parts so as not to exceed the dimensional limits during transportation. In this case, each of the high-pressure piping circuit and the low-pressure piping circuit arranged along the work attachment is configured to be divisible into a plurality of pipes. Therefore, in order to facilitate the disassembly work and assembly work of the work attachment, it is desirable that the high-pressure piping circuit and the low-pressure piping circuit be arranged on one or both of the right side surface and the left side surface of the work attachment, rather than on the upper surface of the work attachment.

[0007] Patent Document 2 discloses a front attachment of a work machine having a configuration in which a plurality of hydraulic pipes arranged on the upper surface of a boom are covered by a handrail having steps and a cover and a fixed fence. The technology of this Patent Document 2 is premised on arranging a plurality of hydraulic pipes along the upper surface of the work attachment. Therefore, when the high-pressure piping circuit and the low-pressure piping circuit are arranged on the right side surface or the left side surface of the work attachment, it is difficult to apply the technology of Patent Document 2.

[0008] Patent Document 3 discloses a working machine in which piping is arranged along the longitudinal direction of a working attachment on the side of the working attachment, and the piping is arranged above a grease supply distribution valve so as to prevent the impact of falling objects from above on the grease supply distribution valve. In the working machine of this Patent Document 3, there is always a gap between two adjacent pipes arranged above the grease supply distribution valve. Therefore, there is room for improvement in the technology of Patent Document 3.

[0009] The present disclosure has been made in view of the above problems, and an object thereof is to provide a pipe protection unit that can protect a low-pressure pipe in a working machine.

Means for Solving the Problems

[0010] Provided is a pipe protection unit in a working machine including a base machine and a working attachment supported by the base machine, including at least one inner low-pressure pipe that is a hydraulic pipe arranged along an attachment side surface that is one of a left side surface and a right side surface of the working attachment, and a hydraulic pipe arranged along the attachment side surface outside the at least one inner low-pressure pipe, the at least one outer high-pressure pipe having an outer diameter larger than that of the at least one inner low-pressure pipe, and a plate arranged along the attachment side surface so as to be interposed between the at least one inner low-pressure pipe and the at least one outer high-pressure pipe and supported by the working attachment, the cover plate covering at least a part of the at least one inner low-pressure pipe.

[0011] In this pipe protection unit, the inner low-pressure pipe is protected by a high-strength outer high-pressure pipe arranged outside the inner low-pressure pipe and a cover plate interposed between the inner low-pressure pipe and the outer high-pressure pipe and covering at least a part of the inner low-pressure pipe.

[0012] The pipe protection unit is a pressure release connector for discharging the pressure inside the at least one outer high-pressure pipe and discharging the pressure inside the at least one inner low-pressure pipe, and preferably further includes a pressure release connector supported at a portion of the cover plate or the attachment side surface facing the cover plate. In this configuration, the parts for discharging the pressure inside each of the outer high-pressure pipe and the inner low-pressure pipe can be aggregated into the pressure release connector in the pipe protection unit. That is, the operator can perform the pressure release operations for the outer high-pressure pipe and the inner low-pressure pipe at one location. Thereby, in the disassembly operation of the work attachment that the operator performs using, for example, an aerial work platform, the workability of the pressure release operations for the outer high-pressure pipe and the inner low-pressure pipe is improved.

[0013] The pressure release connector has a high-pressure pipe pressure release port for discharging the pressure inside the at least one outer high-pressure pipe and a low-pressure pipe pressure release port for discharging the pressure inside the at least one inner low-pressure pipe, and the pressure release connector is preferably disposed at a position corresponding to the lower part of the cover plate in a state where the work attachment is disposed in a lying-down posture in which the work attachment extends along the ground. In this configuration, since the pressure release connector is disposed at a position corresponding to the lower part of the cover plate in a state where the work attachment is disposed in the lying-down posture, the operator can more easily perform the pressure release operation of discharging the pressure inside the outer high-pressure pipe and the inner low-pressure pipe from the high-pressure pipe pressure release port and the low-pressure pipe pressure release port in the vicinity of the left side surface or the right side surface of the work attachment disposed in the lying-down posture.

[0014] The at least one outer high-pressure pipe includes a plurality of outer high-pressure pipes, and it is more preferable that the high-pressure pipe pressure release port and the low-pressure pipe pressure release port are arranged below the lowermost outer high-pressure pipe among the plurality of outer high-pressure pipes in a state where the work attachment is arranged in the lying posture. In this configuration, when an operator accesses the high-pressure pipe pressure release port and the low-pressure pipe pressure release port near the left or right side surface of the work attachment arranged in the lying posture, the plurality of outer high-pressure pipes do not get in the way, so the workability of the pressure release work is further improved.

[0015] The cover plate has an outer surface of the plate on the side opposite to the attachment side surface where the pressure release connector is fixed. The pressure release connector preferably has an inner surface facing the attachment side surface and an inner connection port formed on the inner surface to which an inner end portion, which is one end portion of the at least one inner low-pressure pipe, is connected. In this configuration, the inner low-pressure pipe is arranged in the inner space, which is the space between the cover plate and the attachment side surface. The inner end portion of the inner low-pressure pipe can be connected to the inner connection port formed on the inner surface (the inner surface facing the attachment side surface) of the pressure release connector. And since the pressure release connector is fixed to the outer surface of the plate of the cover plate, it is not necessary to secure a space for arranging the pressure release connector in the inner space. Thereby, an increase in the inner space can be suppressed. Also, since the pressure release connector is fixed to the outer surface of the plate of the cover plate, the work of attaching the pressure release connector to the cover plate becomes easy.

[0016] The cover plate preferably has a through hole formed in a region corresponding to the inner connection port. In this configuration, while arranging the pressure release connector within the range of the cover plate in a side view, the inner end portion of the inner low-pressure pipe can be connected to the inner connection port of the pressure release connector through the through hole.

[0017] The pipe protection unit is a hydraulic pipe connected to the at least one inner low-pressure pipe via the pressure-release connector, and further includes at least one outer low-pressure pipe having an outer end portion disposed outside the cover plate. The pressure-release connector preferably further has an outer connection port which is a connection port disposed outside the cover plate and to which the outer end portion is connected. In this configuration, the pressure-release connector can not only function to release the pressure inside the inner low-pressure pipe, but also connect the inner low-pressure pipe to the outer low-pressure pipe. The inner low-pressure pipe and the outer low-pressure pipe form a part of the low-pressure pipe circuit, and the pressure-release connector can lead out a part of the low-pressure pipe circuit from the inside to the outside of the cover plate.

[0018] The pipe protection unit preferably further includes a fixing portion for fixing the at least one outer high-pressure pipe to the cover plate, the fixing portion being attached to the cover plate. In this configuration, since the outer high-pressure pipe is fixed to the cover plate, the handling of the pipe protection unit is facilitated in the operation of attaching the pipe protection unit to the attachment side surface and the operation of removing the pipe protection unit from the attachment side surface.

[0019] The pipe protection unit preferably further includes at least one flexible high-pressure pipe connected to the at least one outer high-pressure pipe and having flexibility. In this configuration, one end portion of the flexible high-pressure pipe is stably supported by the cover plate via the outer high-pressure pipe fixed to the cover plate, and the flexible high-pressure pipe itself has flexibility. Therefore, the operation of connecting the flexible high-pressure pipe to another high-pressure pipe and the operation of removing the flexible high-pressure pipe from the another high-pressure pipe are facilitated.

Effects of the Invention

[0020] According to the present disclosure, there is provided a pipe protection unit capable of protecting a low-pressure pipe in a work machine.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Embodiments for Carrying Out the Invention

[0022] Embodiments of the present disclosure will be described with reference to the drawings.

[0023] The working machine 100 shown in FIG. 1 is a disassembling machine for performing disassembling work. The working machine 100 includes a base machine 10 and a working attachment 20.

[0024] The base machine 10 includes a lower traveling body 11 and an upper revolving body 12. The lower traveling body 11 includes a lower frame (not shown) and a pair of crawler traveling devices 13 arranged on the left and right thereof, and can travel on the ground G by the operation of the crawler traveling devices 13. The upper revolving body 12 includes a revolving frame 14 and a plurality of revolving elements mounted thereon. The revolving frame 14 is mounted on the lower frame of the lower traveling body 11 so as to be rotatable about a vertical axis. The plurality of revolving elements include a cab 12A, a counterweight 12B, a machine room 12C, etc. Inside the cab 12A, a driver's seat on which an operator sits, a pair of left and right operation levers for the operator to give operations, etc. are arranged. In the machine room 12C, a prime mover 12D such as an engine, at least one hydraulic pump 12E driven by the prime mover 12D, a control valve unit 12F for controlling the flow of hydraulic oil from the hydraulic pump 12E to each of a plurality of hydraulic cylinders C1 to C4 described later, a tank 12G to which the hydraulic oil from the plurality of hydraulic cylinders C1 to C4 returns, etc. are arranged.

[0025] The directions of "up", "down", "front", "rear", "left", and "right" shown in the drawings are based on the direction of the upper revolving body 12 of the working machine 100. Specifically, the front-rear direction is a horizontal direction based on the direction of the driver's seat arranged in the cab 12A of the upper revolving body 12, and the left-right direction is a horizontal direction orthogonal to the front-rear direction.

[0026] The working attachment 20 includes a boom 20A that is attached to the upper revolving body 12 so as to be able to rise and fall, a connecting member 25 (inter-boom) that is rotatably attached to the boom 20A, an arm 20B that is rotatably attached to the connecting member 25, and a tip working device 28. The boom 20A includes at least one boom component. The arm 20B includes at least one arm component.

[0027] The working attachment 20 is long in the erected state in order to enable working at high places by the tip working device 28. The working attachment 20 is configured to be divisible into a plurality of parts so as not to exceed the dimensional limits during transportation.

[0028] In the present embodiment, the at least one boom component includes a first boom component 21, a second boom component 22, a third boom component 23, and a fourth boom component 24, and the at least one arm component includes a first arm component 26 and a second arm component 27. The plurality of boom components 21 to 24 are arranged in series in this order and are connected to each other to form the boom 20A. The plurality of arm components 26, 27 are arranged in series in this order and are connected to each other to form the arm 20B. The boom 20A, the connecting member 25, the arm 20B, and the tip working device 28 are arranged in series in this order and are connected to each other to form the working attachment 20. The plurality of boom components 21 to 24 are detachable from each other, and the plurality of arm components 26, 27 are detachable from each other.

[0029] The boom 20A has a base end portion and a tip portion on the opposite side thereof, and has a shape extending from the base end portion toward the tip portion. In the present embodiment, the base end portion of the boom 20A is the base end portion 21E of the first boom component 21, and the tip portion of the boom 20A is the tip portion of the fourth boom component 24. The base end portion of the boom 20A is connected to the base machine 10 via a pin so as to be rotatable around the boom rotation axis extending in the left - right direction. Thereby, the boom 20A can rotate in the undulating direction, that is, the up - and - down direction, with respect to the base machine 10. The base end portion of the boom 20A is detachable from the base machine 10.

[0030] The connecting member 25 has a base end portion and a tip portion on the opposite side thereof. The base end portion of the connecting member 25 is connected to the tip portion of the boom 20A via a pin so as to be rotatable around the connecting member rotation axis extending in the left - right direction. Thereby, the connecting member 25 can rotate with respect to the boom 20A. The base end portion of the connecting member 25 is detachable from the tip portion of the boom 20A.

[0031] The arm 20B has a base end portion and a tip portion on the opposite side thereof, and has a shape extending from the base end portion toward the tip portion. In the present embodiment, the base end portion of the arm 20B is the base end portion of the first arm component 26, and the tip portion of the arm 20B is the tip portion of the second arm component 27. The base end portion of the arm 20B is connected to the tip portion of the connecting member 25 via a pin so as to be rotatable around the arm rotation axis extending in the left - right direction. Thereby, the arm 20B can rotate with respect to the connecting member 25. The base end portion of the arm 20B is detachable from the tip portion of the connecting member.

[0032] The tip working device 28 is rotatably connected to the tip of the arm 20B with respect to the arm. The tip working device 28 according to the present embodiment is a so-called crusher, and includes a crusher main body 28A, a pair of crushing blades 28B, 28B, a pair of crushing cylinders 28C, 28C, and a link mechanism 28D. The link mechanism 28D connects the crusher main body 28A and the tip of the arm 20B so that the crusher main body 28A can rotate around the working device rotation axis extending in the left-right direction with respect to the tip of the arm 20B. The base end portion of the tip working device 28, specifically, the base end portion of the link mechanism 28D is detachable from the tip of the arm 20B. The crusher main body 28A supports the pair of crushing blades 28B, 28B so as to be openable and closable, that is, rotatable around an axis parallel to each other. The pair of crushing cylinders 28C, 28C are respectively interposed between the pair of crushing blades 28B, 28B and the crusher main body 28A, and expand and contract so as to rotate the pair of crushing blades 28B, 28B in the opening and closing directions. A rotation mechanism including a rotation hydraulic motor (not shown in the figure) is disposed at the tip side portion of the link mechanism 28D. This rotation mechanism can rotate the crusher main body 28A with respect to the link mechanism 28D. Along with the rotation of the crusher main body 28A, the pair of crushing blades 28B, 28B supported by the crusher main body 28A rotate, so that the pair of crushing blades 28B, 28B can shear an object at a free angle.

[0033] As shown in FIG. 1, the first boom component 21 has a tip portion on the side opposite to the base end portion 21E. The second boom component 22 has a base end portion connected to the tip portion of the first boom component 21 and a tip portion on the side opposite to the base end portion. The third boom component 23 has a base end portion connected to the tip portion of the second boom component 22 and a tip portion on the side opposite to the base end portion. The fourth boom component 24 has a base end portion connected to the tip portion of the third boom component 23. The first arm component 26 has the base end portion and a tip portion on the side opposite to the base end portion, and the second arm component 27 has a base end portion connected to the tip portion of the first arm component and a tip portion on the side opposite to the base end portion.

[0034] FIG. 2 is a perspective view showing the second boom component 22 and various components supported thereby, FIG. 3 is a left side view thereof, FIG. 10 is a right side view showing the second boom component 22 and various components supported thereby, and FIG. 12 is a left side view showing the third boom component 23 and various components supported thereby.

[0035] As shown in FIGS. 2, 3 and 10, the second boom component 22 has a left side plate 22L including the left side surface 221 of the second boom component 22, a right side plate 22R including the right side surface 222 of the second boom component 22, and an intermediate portion 22M interposed between the left side plate 22L and the right side plate 22R. The left side plate 22L is fixed to the left side portion of the intermediate portion 22M and is a plate-like member extending from the base end portion to the tip end portion of the second boom component 22. The right side plate 22R is fixed to the right side portion of the intermediate portion 22M and is a plate-like member extending from the base end portion to the tip end portion of the second boom component 22.

[0036] As shown in FIG. 12, the third boom component 23 is different from the second boom component 22 in terms of the specific shape, but is the same as the second boom component 22 in terms of the basic structure. That is, the third boom component 23 has a left side plate 23L including the left side surface 231 of the third boom component 23, a right side plate including a schematic right side surface of the third boom component 23, and a schematic intermediate portion interposed between the left side plate 23L and the right side plate. The left side plate 23L is fixed to the left side portion of the intermediate portion and is a plate-like member extending from the base end portion to the tip end portion of the third boom component 23. The right side plate of the third boom component 23 is fixed to the right side portion of the intermediate portion and is a plate-like member extending from the base end portion to the tip end portion of the third boom component 23.

[0037] As shown in FIG. 2, the base end portion of the second boom component 22 has base end side connection portions 22A and 22B, and the tip end portion of the second boom component 22 has tip end side connection portions 22C and 22D. As shown in FIG. 12, the base end portion of the third boom component 23 has base end side connection portions 23A and 23B, and the tip end portion of the third boom component 23 has tip end side connection portions 23C and 23D. The tip end side connection portions 22C and 22D of the second boom component 22 and the base end side connection portions 23A and 23B of the third boom component 23 have a structure that can be detachably connected to each other.

[0038] As shown in FIGS. 2, 3, and 10, the proximal end side connection portion 22A of the second boom component 22 includes a pair of left and right protruding portions that respectively protrude outward from the left side plate 22L and the right side plate 22R, and the proximal end side connection portion 22B of the second boom component 22 includes a pair of left and right through holes formed in the left side plate 22L and the right side plate 22R, respectively. The pair of through holes penetrate the left side plate 22L and the right side plate 22R in the thickness direction, respectively. The proximal end side connection portion 22A and the proximal end side connection portion 22B are arranged at intervals in the vertical direction. The distal end side connection portion 22C of the second boom component 22 includes a pair of left and right concave portions, and the distal end side connection portion 22D of the second boom component 22 includes a pair of left and right through holes formed in the left side plate 22L and the right side plate 22R, respectively, and connection pins extending in the left-right direction inserted into these through holes. The pair of through holes penetrate the left side plate 22L and the right side plate 22R in the thickness direction, respectively. The distal end side connection portion 22C and the distal end side connection portion 22D are arranged at intervals in the vertical direction. In a state where the second boom component 22 is arranged such that the longitudinal direction of the second boom component 22 is horizontal as shown in FIG. 3, each of the pair of concave portions has an opening at the upper part or the upper oblique part of the distal end side connection portion 22C.

[0039] The proximal end side connection parts 23A and 23B and the distal end side connection parts 23C and 23D of the third boom part 23 have the same structure as the proximal end side connection parts 22A and 22B and the distal end side connection parts 22C and 22D of the second boom part 22. Specifically, as shown in FIG. 12, the proximal end side connection part 23A of the third boom part 23 includes a pair of left and right protruding parts that respectively protrude outward from the left side plate 23L and the right side plate of the third boom part 23. The proximal end side connection part 23B of the third boom part 23 includes a pair of left and right through holes formed in the left side plate 23L and the right side plate of the third boom part 23 respectively. The pair of through holes penetrate the left side plate 23L and the right side plate of the third boom part 23 in the thickness direction respectively. The proximal end side connection part 23A and the proximal end side connection part 23B are arranged at intervals vertically with respect to each other. The distal end side connection part 23C of the third boom part 23 includes a pair of left and right concave parts. The distal end side connection part 23D of the third boom part 23 includes a pair of left and right through holes formed in the left side plate 23L and the right side plate of the third boom part 23 respectively, and connection pins extending in the left and right directions inserted into these through holes. The distal end side connection part 23C and the distal end side connection part 23D are arranged at intervals vertically with respect to each other. In a state where the third boom part 23 is arranged such that the longitudinal direction of the third boom part 23 is horizontal as shown in FIG. 12, each of the pair of concave parts has an opening at the upper part or the upper oblique part of the distal end side connection part 23C.

[0040] The distal end side connection parts 22C and 22D of the second boom part 22 and the proximal end side connection parts 23A and 23B of the third boom part 23 are connected as follows. First, the pair of left and right protruding parts of the proximal end side connection part 23A of the third boom part 23 are fitted into the pair of left and right concave parts of the distal end side connection part 22C of the second boom part 22. Next, the third boom part 23 is rotated with respect to the second boom part 2 around the central axis of these protruding parts, and the pair of left and right through holes of the proximal end side connection part 23B of the third boom part 23 are arranged at positions corresponding to the pair of left and right through holes of the distal end side connection part 22D of the second boom part 22. Next, the connection pins of the distal end side connection part 22D are inserted into the pair of through holes of the distal end side connection part 22D and the pair of through holes of the proximal end side connection part 23B. Thereby, the distal end side connection parts 22C and 22D of the second boom part 22 and the proximal end side connection parts 23A and 23B of the third boom part 23 are detachably connected to each other.

[0041] The tip of the first boom component 21 has a tip-side connection part (not shown in the figure), and the tip-side connection part of the first boom component 21 and the base-side connection parts 22A and 22B of the second boom component 22 have a structure that can be detachably connected to each other. The base end of the fourth boom component 24 has a base-end side connection part (not shown in the figure), and the tip-side connection parts 23C and 23D of the third boom component and the base-end side connection part of the fourth boom component 24 have a structure that can be detachably connected to each other. The tip-side connection part at the tip of the first boom component 21 has the same structure as the tip-side connection parts 22C and 22D of the second boom component 2, and the base-end side connection part of the fourth boom component 24 has the same structure as the base-end side connection parts 22A and 22B of the second boom component 22.

[0042] Further, the tip of the first arm component 26 has a tip-side connection part (not shown in the figure), and the base end of the second arm component 27 has a base-end side connection part (not shown in the figure). The tip-side connection part of the first arm component 26 and the base-end side connection part of the second arm component 27 have a structure that can be detachably connected to each other. The tip-side connection part of the first arm component 26 has the same structure as the tip-side connection parts 22C and 22D of the second boom component 2, and the base-end side connection part of the second arm component 27 has the same structure as the base-end side connection parts 22A and 22B of the second boom component 22.

[0043] The work attachment 20 further includes a plurality of hydraulic cylinders for changing the posture of the work attachment 20. The plurality of hydraulic cylinders receive the supply of hydraulic oil from the base machine 10 and expand and contract to change the angle formed by the components of the work attachment 20, thereby changing the posture of the entire work attachment 20.

[0044] Specifically, the plurality of hydraulic cylinders include a boom cylinder C1, a connecting member cylinder C2, an arm cylinder C3, and a working device cylinder C4. These cylinders C1, C2, C3, and C4 are schematically shown by a dashed line in FIG. 1.

[0045] The boom cylinder C1 is interposed between the base machine 10 and the boom 20A so as to raise and lower the boom 20A with respect to the base machine 10 by its expansion and contraction. Specifically, the boom cylinder C1 has a cylinder base end portion and a cylinder tip portion on the opposite side thereof. The cylinder base end portion is connected to the base machine 10 via a cylinder pin so as to be rotatable about an axis parallel to the boom rotation axis, and the cylinder tip portion is connected to the boom 20A (the first boom component 21 in this embodiment) via a cylinder pin so as to be rotatable about an axis parallel to the boom rotation axis. The boom cylinder C1 has a head side chamber and a rod side chamber.

[0046] The connecting member cylinder C2 is interposed between the boom 20A and the connecting member 25 so as to rotate the connecting member 25 with respect to the boom 20A by its expansion and contraction. Specifically, the connecting member cylinder C2 has a cylinder base end portion and a cylinder tip portion on the opposite side thereof. The cylinder base end portion is connected to the boom 20A (the fourth boom component 24 in this embodiment) via a cylinder pin so as to be rotatable about an axis parallel to the connecting member rotation axis, and the cylinder tip portion is connected to the connecting member 25 via a cylinder pin so as to be rotatable about an axis parallel to the connecting member rotation axis. The connecting member cylinder C2 has a head side chamber and a rod side chamber.

[0047] The arm cylinder C3 is interposed between the connecting member 25 and the arm 20B so as to rotate the arm 20B with respect to the connecting member 25 by its expansion and contraction. Specifically, the arm cylinder C3 has a cylinder base end portion and a cylinder tip portion on the opposite side thereof. The cylinder base end portion is connected to the connecting member 25 via a cylinder pin so as to be rotatable about an axis parallel to the arm rotation axis, and the cylinder tip portion is connected to the arm 20B (the first arm component 26 in this embodiment) via a cylinder pin so as to be rotatable about an axis parallel to the arm rotation axis. The arm cylinder C3 has a head side chamber and a rod side chamber.

[0048] The working device cylinder C4 is interposed between the arm 20B and the tip working device 28 so as to rotate the tip working device 28 with respect to the arm 20B by its expansion and contraction. Specifically, the working device cylinder C4 has a cylinder base end portion and a cylinder tip end portion on the opposite side thereof. The cylinder base end portion is connected to the arm 20B (the second arm component 27 in this embodiment) via a cylinder pin so as to be rotatable about an axis parallel to the working device rotation axis, and the cylinder tip end portion is connected to the tip working device 28 (the link mechanism 28D in this embodiment) via a cylinder pin so as to be rotatable about an axis parallel to the working device rotation axis. The working device cylinder C4 has a head side chamber and a rod side chamber.

[0049] The working machine 100 further includes a plurality of high-pressure piping circuits and a plurality of low-pressure piping circuits.

[0050] The plurality of high-pressure piping circuits include four high-pressure piping circuits PC1 to PC4 for supplying the hydraulic oil discharged from the hydraulic pump 12E disposed in the machine room 12C of the upper swing body 12 to the boom cylinder C1, the connecting member cylinder C2, the arm cylinder C3, and the working device cylinder C4, respectively. Each of the four high-pressure piping circuits PC1 to PC4 is schematically shown by a two-dot chain line in FIG. 1. The four high-pressure piping circuits PC1 to PC4 are a first high-pressure piping circuit PC1 (boom cylinder high-pressure piping circuit), a second high-pressure piping circuit PC2 (connecting member cylinder high-pressure piping circuit), a third high-pressure piping circuit PC3 (arm cylinder high-pressure piping circuit), and a fourth high-pressure piping circuit PC4 (working device cylinder high-pressure piping circuit). Each of the second high-pressure piping circuit PC2, the third high-pressure piping circuit PC3, and the fourth high-pressure piping circuit PC4 is arranged to extend along the left side surface or the right side surface of the working attachment 20.

[0051] Each of the four high-pressure piping circuits PC1 to PC4 has an upstream circuit and a downstream circuit. Specifically, the upstream circuit of the first high-pressure piping circuit PC1 connects the hydraulic pump 12E to one of the head side chamber and the rod side chamber of the boom cylinder C1, and the downstream circuit of the first high-pressure piping circuit PC1 connects the other of the head side chamber and the rod side chamber of the boom cylinder C1 and the tank 12G. The upstream circuit of the second high-pressure piping circuit PC2 connects the hydraulic pump 12E to one of the head side chamber and the rod side chamber of the connecting member cylinder C2, and the downstream circuit of the second high-pressure piping circuit PC2 connects the other of the head side chamber and the rod side chamber of the connecting member cylinder C2 and the tank 12G. The upstream circuit of the third high-pressure piping circuit connects the hydraulic pump 12E to one of the head side chamber and the rod side chamber of the arm cylinder C3, and the downstream circuit of the third high-pressure piping circuit connects the other of the head side chamber and the rod side chamber of the arm cylinder C3 and the tank 12G. The upstream circuit of the fourth high-pressure piping circuit connects the hydraulic pump 12E to one of the head side chamber and the rod side chamber of the working device cylinder C4, and the downstream circuit of the fourth high-pressure piping circuit connects the other of the head side chamber and the rod side chamber of the working device cylinder C4 and the tank 12G.

[0052] When no operation is applied to either of the pair of operation levers, the control valve unit 12F prevents the hydraulic oil discharged from the hydraulic pump 12E from being supplied to the cylinders C1 to C4. When an operation is applied to at least one of the pair of operation levers, the control valve unit 12F allows the hydraulic oil discharged from the hydraulic pump 12E to be supplied to either one of the head side chamber and the rod side chamber of the hydraulic cylinder corresponding to the operation among the cylinders C1 to C4, and operates to allow the hydraulic oil discharged from the other of the head side chamber and the rod side chamber to return to the tank 12G.

[0053] The boom cylinder C1 has its cylinder base end connected to the base machine 10 and is arranged at a position relatively close to the hydraulic pump 12E. Therefore, the first high-pressure piping circuit PC1 connected to the boom cylinder C1 is arranged near the upper swing body 12. On the other hand, the connecting member cylinder C2, the arm cylinder C3, and the working device cylinder C4 are arranged at positions far from the upper swing body 12 as shown in FIG. 1. Therefore, the second high-pressure piping circuit PC2 connected to the connecting member cylinder C2, the third high-pressure piping circuit PC3 connected to the arm cylinder C3, and the fourth high-pressure piping circuit PC4 connected to the working device cylinder C4 are respectively arranged to extend along the working attachment 20 as shown in FIG. 1.

[0054] Specifically, the upstream circuit of the second high-pressure piping circuit PC2 extends from the hydraulic pump 12E to the base end of the boom 20A and then extends from the base end along either the left or right side surface of the boom 20A to the connecting member cylinder C2. The downstream circuit of the second high-pressure piping circuit PC2 extends from the connecting member cylinder C2 along either the left or right side surface of the boom 20A to the base end of the boom 20A and then extends from the base end to the tank 12G.

[0055] The upstream circuit of the third high-pressure piping circuit PC3 extends from the hydraulic pump 12E to the base end of the boom 20A, then extends from the base end along either the left or right side surface of the boom 20A to the tip of the boom 20A, and then extends from the tip along either the left or right side surface of the connecting member 25 to the arm cylinder C3. The downstream circuit of the third high-pressure piping circuit PC3 extends from the arm cylinder C3 along either the left or right side surface of the connecting member 25 to the tip of the boom 20A, then extends from the tip along either the left or right side surface of the boom 20A to the base end of the boom 20A, and then extends from the base end to the tank 12G.

[0056] The upstream circuit of the fourth high-pressure piping circuit PC4 extends from the hydraulic pump 12E to the base end of the boom 20A, extends from the base end to the tip of the boom 20A along either the left or right side surface of the boom 20A, extends from the tip to the tip of the connecting member 25 along either the left or right side surface of the connecting member 25, and extends from the tip to the working device cylinder C4 along either the left or right side surface of the arm 20B. The downstream circuit of the fourth high-pressure piping circuit PC4 extends from the working device cylinder C4 to the tip of the connecting member 25 along either the left or right side surface of the arm 20B, extends from the tip to the tip of the boom 20A along either the left or right side surface of the connecting member 25, extends from the tip to the base end of the boom 20A along either the left or right side surface of the boom 20A, and extends from the base end to the tank 12G.

[0057] The plurality of low-pressure piping circuits include a low-pressure piping circuit for supplying hydraulic oil to the quick hitch, a low-pressure piping circuit for supplying hydraulic oil to the pin removal and insertion device, a low-pressure piping circuit for supplying hydraulic oil to the pair of crushing cylinders 28C, 28C, a low-pressure piping circuit for supplying hydraulic oil to the rotary hydraulic motor for rotating the crusher body 28A with respect to the link mechanism 28D, and the like. The quick hitch is, for example, a mechanical component attached to the tip of the arm 20B, and is a device for automatically connecting the tip working device 28 such as a crusher, a bucket, a lifting magnet, a breaker, etc. and the tip of the arm 20B. The pin removal and insertion device is a device for inserting and removing the connecting pin for connecting two adjacent components among the plurality of components constituting the working attachment 20. Among the plurality of low-pressure piping circuits, those that need to send hydraulic oil to a part relatively far from the upper swing body 12 in the working attachment 20 are arranged to extend along the working attachment 20. Although the illustration of the plurality of low-pressure piping circuits is omitted in FIG. 1, the plurality of low-pressure piping circuits are arranged to extend along the left or right side surface of the working attachment 20 like the high-pressure piping circuits PC2 to PC4 in FIG. 1.

[0058] The work machine 100 according to this embodiment is a disassembling machine as shown in FIG. 1. Since the working attachment 20 has a large dimension in the longitudinal direction, the working attachment 20 is transported in a state of being divided into a plurality of parts. Therefore, each of the second high-pressure piping circuit PC2, the third high-pressure piping circuit PC3, and the fourth high-pressure piping circuit PC4 is formed by connecting a plurality of high-pressure pipes in series via a plurality of connectors so as to be detachable from each other. Similarly, each of the low-pressure piping circuits arranged to extend along the working attachment 20 among the plurality of low-pressure piping circuits is formed by connecting a plurality of low-pressure pipes in series via a plurality of connectors so as to be detachable from each other.

[0059] Since the pressure (maximum pressure) of the hydraulic oil in each of the plurality of low-pressure pipes is lower than that in the high-pressure pipes, the outer diameter of the low-pressure pipes is smaller and the strength is lower than that of the high-pressure pipes. Therefore, the work machine 100 according to this embodiment includes a plurality of pipe protection units having a pipe protection structure for protecting at least a part of the plurality of low-pressure pipes. Hereinafter, the pipe protection unit according to this embodiment will be specifically described.

[0060] The plurality of pipe protection units include a pipe protection unit UN1 arranged on the left side surface 221 of the second boom part 22 as shown in FIGS. 2 and 3, a pipe protection unit UN2 arranged on the right side surface 222 of the second boom part 22 as shown in FIG. 10, and a pipe protection unit UN3 arranged on the left side surface 231 of the third boom part 23 as shown in FIG. 12. Each of the left side surface 221, the right side surface 222, and the left side surface 231 is an example of an attachment side surface.

[0061] Although illustration is omitted, the plurality of pipe protection units may include at least one of a pipe protection unit arranged on the left side surface of the first boom component 21, a pipe protection unit arranged on the right side surface of the first boom component 21, a pipe protection unit arranged on the right side surface of the third boom component 23, a pipe protection unit arranged on the left side surface of the fourth boom component 24, and a pipe protection unit arranged on the right side surface of the fourth boom component 24. Further, the plurality of pipe protection units may include at least one of a pipe protection unit arranged on the left side surface of the first arm component 26, a pipe protection unit arranged on the right side surface of the first arm component 26, a pipe protection unit arranged on the left side surface of the second arm component 27, and a pipe protection unit arranged on the right side surface of the second arm component 27.

[0062] In the present embodiment, the plurality of pipe protection units have similar basic structures to each other. That is, each of the plurality of pipe protection units includes a plurality of low-pressure pipes, a plurality of high-pressure pipes, and a cover plate 50 (pipe fixing plate). The plurality of low-pressure pipes include a plurality of inner low-pressure pipes 30 as shown in FIG. 5, for example, and the plurality of high-pressure pipes include a plurality of outer high-pressure pipes 40 as shown in FIG. 2, for example. The plurality of inner low-pressure pipes 30 are hydraulic pipes arranged along the attachment side surface. The plurality of outer high-pressure pipes 40 are hydraulic pipes arranged along the attachment side surface outside the plurality of inner low-pressure pipes 30. The plurality of outer high-pressure pipes 40 have an outer diameter larger than that of the plurality of inner low-pressure pipes 30. The cover plate 50 is a plate arranged along the attachment side surface so as to be interposed between the plurality of inner low-pressure pipes 30 and the plurality of outer high-pressure pipes 40 and supported by the work attachment 20. The cover plate 50 covers at least a part of each of the plurality of inner low-pressure pipes 30. Since the plurality of pipe protection units each have the basic structure as described above, hereinafter, the pipe protection unit UN1 arranged on the left side surface 221 of the second boom component 22 will be mainly described in detail.

[0063] Figures 2 to 9 are diagrams related to the pipe protection unit UN1 arranged on the left side surface 221 of the second boom part 22. As shown in Figures 2 to 5, the pipe protection unit UN1 includes a plurality of inner low-pressure pipes 30, a plurality of outer low-pressure pipes 30A, a plurality of outer low-pressure pipes 30B, a plurality of outer high-pressure pipes 40, a plurality of flexible high-pressure pipes 40F, and a plurality of connectors. The plurality of connectors include a plurality of high-pressure pipe connectors 40CN, 41CN, 42CN, a pressure release connector 60, and a plurality of low-pressure pipe connectors 70 to 73.

[0064] A brief description of Figures 2 to 9 is as follows. In the perspective view of Figure 2 and the left side view of Figure 3, the second boom part 22, a plurality of high-pressure pipes 40, 40F, a plurality of low-pressure pipes 30, 30A, 30B, a cover plate 50, and the plurality of connectors are respectively depicted. On the other hand, Figure 4 is a perspective view omitting the illustration of the plurality of high-pressure pipes 40, 40F in Figure 2, and Figure 5 is a left side view omitting the illustration of the plurality of high-pressure pipes 40, 40F in Figure 3. Figure 6 is an enlarged view of a part of Figure 5. Figure 7 is a view when the left side plate 22L of the second boom part 22, a plurality of inner low-pressure pipes 30, a cover plate 50, a plurality of outer high-pressure pipes 40, and the pressure release connector 60 are viewed in the direction of arrow VII in Figure 2. Figures 8 and 9 are perspective views showing the pressure release connector 60 and its periphery.

[0065] As shown in Figures 4 to 7, in the pipe protection unit UN1, the cover plate 50 is a plate-like member arranged at a distance in the left-right direction with respect to the left side surface 221 of the second boom part 22. The cover plate 50 has an inner surface of the plate 502 which is the inner surface facing the left side surface 221 of the second boom part 22, and an outer surface of the plate 501 which is the opposite side of the inner surface of the plate 502. In the present embodiment, the cover plate 50 has a flat plate shape substantially parallel to the left side surface 221 of the second boom part 22. However, the shape of the cover plate 50 is not limited to a flat plate, and the cover plate 50 does not necessarily have to be arranged parallel to the left side surface 221 of the second boom part 22.

[0066] As shown in FIG. 7, the pipe protection unit UN1 further includes a plurality of support members 51 that support the cover plate 50. The plurality of support members 51 are arranged at positions that are somewhat dispersed over the entire area of the cover plate 50 as shown in FIG. 6, for example. Each of the plurality of support members 51 has a support member base end portion that is a base end portion fixed to the left side surface 221 of the second boom component 22, and a support member tip end portion that is a tip end portion fixed to the cover plate 50. In the present embodiment, each support member 51 has a column shape extending from the support member base end portion to the support member tip end portion, but the shape of each support member 51 is not limited to the column shape. Each of the plurality of support members 51 has a length that enables a plurality of inner low-pressure pipes 30 to be arranged in an inner space, which is a space between the left side surface 221 of the second boom component 22 and the inner surface 502 of the plate of the cover plate 50.

[0067] Each of the plurality of outer high-pressure pipes 40 has a pipe base end portion and a pipe tip end portion, and each of the plurality of flexible high-pressure pipes 40F has a pipe base end portion and a pipe tip end portion. A plurality of high-pressure pipe connectors 40CN are respectively attached to the pipe base end portions of the plurality of outer high-pressure pipes 40. A plurality of high-pressure pipe connectors 42CN are respectively attached to the pipe tip end portions of the plurality of flexible high-pressure pipes 40F. The pipe tip end portions of the plurality of outer high-pressure pipes 40 are respectively connected to the pipe base end portions of the plurality of flexible high-pressure pipes 40F via a plurality of high-pressure pipe connectors 41CN.

[0068] The plurality of high-pressure pipe connectors 40CN in the pipe protection unit UN1 are detachably connected to a plurality of high-pressure pipe connectors attached to a plurality of high-pressure pipes (not shown) arranged along the left side surface of the first boom component 21. The plurality of high-pressure pipe connectors 42CN in the pipe protection unit UN1 are detachably connected to the plurality of high-pressure pipe connectors 40CN in the pipe protection unit UN3 arranged on the left side surface 231 of the third boom component 23 shown in FIG. 12.

[0069] In the specific example shown in FIG. 3, the pipe protection unit UN1 has six high-pressure pipe sets, and each high-pressure pipe set includes one outer high-pressure pipe 40 and one flexible high-pressure pipe 40F. Each high-pressure pipe set is included in either the upstream circuit or the downstream circuit of any of the plurality of high-pressure pipe circuits.

[0070] Each of the plurality of outer high-pressure pipes 40 is made of a pipe such as a steel pipe, and has pressure resistance that can withstand the high pressure caused by the hydraulic oil inside. The rigidity of each of the plurality of outer high-pressure pipes 40 is higher than the rigidity of the flexible high-pressure pipe 40F. Each of the plurality of outer high-pressure pipes 40 is fixed to the cover plate 50. The plurality of outer high-pressure pipes 40 are arranged side by side along the cover plate 50.

[0071] The pipe protection unit UN1 further includes a fixing portion for fixing the plurality of outer high-pressure pipes 40 to the cover plate 50. The fixing portion is attached to the cover plate 50. As shown in FIGS. 7 to 9, the fixing portion restrains the vicinity of both ends of each outer high-pressure pipe 40 respectively.

[0072] Specifically, the fixing portion includes a plurality of struts 42 extending to the outside (left side) opposite to the left side surface 221 of the second boom component 22 from the cover plate 50, and at least one fixing member 41 supported by each strut 42. In this embodiment, two fixing members 41 are supported by one strut 42. The plurality of struts 42 include a plurality of base-end side struts 42 arranged near the pipe base end portion of the outer high-pressure pipe 40, and a plurality of tip-side struts 42 arranged near the pipe tip portion of the outer high-pressure pipe 40. Each of the plurality of outer high-pressure pipes 40 is fixed to the cover plate 50 by the corresponding base-end side strut 42 and the fixing member 41 supported thereby, and the corresponding tip-side strut 42 and the fixing member 41 supported thereby. Each fixing member 41 has a structure that can be divided into two parts by removing a fastening member such as a bolt. The two parts are fixed to each other by bolts in a state of being arranged to surround the corresponding outer high-pressure pipe 40. Thereby, the outer high-pressure pipe 40 is fixed to the cover plate 50.

[0073] Each of the plurality of flexible high-pressure pipes 40F is composed of a flexible pipe and has pressure resistance capable of withstanding the high pressure caused by the hydraulic oil inside. Since the pipe base ends of the plurality of flexible high-pressure pipes 40F are respectively attached to the plurality of high-pressure pipe connectors 41CN as described above, their positions are fixed. On the other hand, the portions of each of the plurality of flexible high-pressure pipes 40F excluding the pipe base ends can be positioned freely to some extent. Thereby, in the assembly and disassembly operations of the second boom component 22 and the third boom component 23, the attachment and detachment operations between the plurality of high-pressure pipe connectors 42CN in the pipe protection unit UN1 and the plurality of high-pressure pipe connectors 40CN in the pipe protection unit UN3 are facilitated.

[0074] As shown in FIG. 6, the plurality of inner low-pressure pipes 30 are arranged side by side in the inner space, which is the space between the cover plate 50 and the left side surface 221 of the second boom component 22. Each of the plurality of inner low-pressure pipes 30 is composed of a flexible pipe. Thereby, it becomes easy to arrange the plurality of inner low-pressure pipes 30 in the inner space. Each of the plurality of inner low-pressure pipes 30 has a pipe base end and a pipe tip end. Each of the plurality of outer low-pressure pipes 30A has a pipe base end and a pipe tip end. Each of the plurality of outer low-pressure pipes 30B has a pipe base end and a pipe tip end. The pipe base ends of the plurality of outer low-pressure pipes 30A are connected to the low-pressure pipe connector 70. The low-pressure pipe connector 70 is detachably connected to a schematic low-pressure pipe connector to which the pipe tip ends of a plurality of schematic low-pressure pipes arranged along the left side surface of the first boom component 21 are connected. The pipe tip ends of the plurality of outer low-pressure pipes 30B are connected to the low-pressure pipe connector 73. The low-pressure pipe connector 73 is detachably connected to the low-pressure pipe connector 70 in the pipe protection unit UN3 arranged on the left side surface 231 of the third boom component 23. The low-pressure pipe connector 73 is fixed to the left side surface 221 of the second boom component 22 at a position deviated from the cover plate 50.

[0075] As shown in FIGS. 3 and 5, the cover plate 50 has a plate base end region R1, a plate intermediate region R2, and a plate tip region R3. The plate base end region R1 is a region including a portion corresponding to the pipe base end portions of the plurality of outer high-pressure pipes 40. The plate tip region R3 is a region including a portion corresponding to the pipe tip portions of the plurality of outer high-pressure pipes 40. The plate intermediate region R2 is a region located between the plate base end region R1 and the plate tip region R3 and connecting them. As shown in FIGS. 3 and 5, in a state where the second boom component 22 is arranged in a posture (lying-down posture) such that the longitudinal direction of the second boom component 22 is substantially horizontal, in other words, for example, in a state where the work attachment 20 is arranged in a posture (lying-down posture) lying down substantially horizontally, the plate tip region R3 is closer to the tip portion (the left end portion in FIGS. 3 and 5) of the second boom component 22 than the plate base end region R1. In the present embodiment, in a state where the work attachment 20 is arranged in the lying-down posture, the cover plate 50 has a shape extending obliquely upward (upward and forward) from the plate base end region R1 toward the plate tip region R3. However, the shape of the cover plate 50 is not limited to the shape shown in FIG. 3.

[0076] The pressure release connector 60 is a connector capable of releasing the pressure inside the pipe connected to the pressure release connector 60. The pressure release connector 60 is supported by the cover plate 50. Further, the pressure release connector 60 is a connector capable of connecting a part of the plurality of inner low-pressure pipes 30 and a part of the plurality of outer low-pressure pipes 30A.

[0077] As shown in FIGS. 6 and 7, the punching connector 60 has a first side surface 601 which is the inner surface (the right side surface in this embodiment) facing the outer surface 501 of the cover plate 50 of the cover plate 50, a second side surface 602 which is the outer surface on the opposite side of the first side surface 601 (the left side surface in this embodiment), a third side surface 603 connecting the first side surface 601 and the second side surface 602, and a fourth side surface 604 connecting the first side surface 601 and the second side surface 602 on the side opposite to the third side surface 603. In this embodiment, as shown in FIGS. 3 and 6, in the state where the second boom component 22 is arranged in the lying posture, the third side surface 603 becomes the upper surface of the punching connector 60, and the fourth side surface 604 becomes the lower surface of the punching connector 60.

[0078] The punching connector 60 is fixed to the cover plate 50 in a state where the first side surface 601 is in contact with the outer surface 501 of the plate. Therefore, the punching connector 60 is arranged outside (on the left side) of the cover plate 50. In other words, the punching connector 60 is arranged on the side opposite to the plurality of inner low-pressure pipes 30 with respect to the cover plate 50.

[0079] The punching connector 60 has a plurality of first connection ports 61, a plurality of second connection ports 62, a plurality of third connection ports 66, and a plurality of punching connection ports 63, 64. Each of the plurality of punching connection ports 63 is an example of a low-pressure pipe punching port, and each of the plurality of punching connection ports 64 is an example of a high-pressure pipe punching port. Each of the plurality of first connection ports 61 is an example of an inner connection port.

[0080] The plurality of first connection ports 61 are formed on the first side surface 601 (inner surface) of the press-fit connector 60. The pipe base ends (an example of inner ends) of some of the plurality of inner low-pressure pipes 30 among the plurality of inner low-pressure pipes 30 are respectively connected to the plurality of first connection ports 61. As shown in FIGS. 6 and 7, through holes 503 are formed in the cover plate 50 at positions corresponding to the plurality of first connection ports 61. Thereby, the plurality of first connection ports 61 are exposed to the space between the cover plate 50 and the left side surface 221 of the second boom component 22 through the through holes 503. This enables the pipe base ends of the plurality of inner low-pressure pipes 30 arranged inside the cover plate 50, that is, in the space between the cover plate 50 and the left side surface 221 of the second boom component 22, to be respectively connected to the plurality of first connection ports 61.

[0081] The plurality of second connection ports 62 are formed on the second side surface 602 (outer surface) of the press-fit connector 60. The ends of the plurality of branch pipes 65 branched from the plurality of outer high-pressure pipes 40 are respectively connected to the plurality of second connection ports 62.

[0082] The plurality of third connection ports 66 are formed on the third side surface 603 of the press-fit connector 60. The pipe tip ends 302 (an example of outer ends) of some of the plurality of outer low-pressure pipes 30A among the plurality of outer low-pressure pipes 30A are respectively connected to the plurality of third connection ports 66. Thereby, the outer low-pressure pipes 30A are respectively connected to the inner low-pressure pipes 30 via the press-fit connector 60.

[0083] The plurality of pressure relief connectors 63, 64 are formed on the fourth side surface 604 of the pressure relief connector 60. The plurality of pressure relief connectors 63 are for discharging the pressure inside the inner low-pressure pipe 30 and the outer low-pressure pipe 30A, and the plurality of pressure relief connectors 64 are for discharging the pressure inside the plurality of outer high-pressure pipes 40. Each of the plurality of pressure relief connectors 63, 64 has a shape to which the end of a hose (not shown) can be connected. When the hose is connected to any of the plurality of pressure relief connectors 63, 64, at least a part of the hydraulic oil inside the corresponding pipe is discharged to the outside through the hose. Thereby, the pressure inside the pipe decreases.

[0084] As shown in FIGS. 3, 5, and 6, the pressure relief connector 60 is located at the lower end of the cover plate 50 in a state where the second boom part 2 is arranged in the lying posture. Specifically, as shown in FIGS. 3 and 8, each of the plurality of pressure relief connectors 63, 64 is arranged below the plurality of outer high-pressure pipes 40 in a state where the second boom part 2 is arranged in the lying posture. Thereby, the operator can easily perform the pressure relief operation using the hose as described above.

[0085] The low-pressure pipe connector 71 is a connector capable of connecting a part of the plurality of inner low-pressure pipes 30 and a part of the plurality of outer low-pressure pipes 30A. Connected to this low-pressure pipe connector 71 are the inner low-pressure pipes 30 and the outer low-pressure pipes 30A other than those connected to the pressure relief connector 60.

[0086] As shown in FIGS. 6 and 7, the low-pressure pipe connector 71 has an inner surface 701 (the right side surface in this embodiment) facing the outer surface 501 of the cover plate 50, an outer surface 702 (the left side surface in this embodiment) on the opposite side of the inner surface 701, and a side surface 703 connecting the inner surface 701 and the outer surface 702. In this embodiment, this side surface 703 is a surface facing the first boom part 21.

[0087] The low-pressure pipe connector 71 is supported by the cover plate 50. Specifically, the low-pressure pipe connector 71 is disposed at a position closer to the plate base end region R1 than the plate tip end region R3. The low-pressure pipe connector 71 is disposed at a position adjacent to the pressure-release connector 60. The low-pressure pipe connector 71 is fixed to the cover plate 50 with its inner surface 701 in contact with the outer surface 501 of the plate. Therefore, the low-pressure pipe connector 71 is disposed outside (to the left) of the cover plate 50. In other words, the low-pressure pipe connector 71 is disposed on the side opposite to the plurality of inner low-pressure pipes 30 with respect to the cover plate 50.

[0088] The low-pressure pipe connector 71 has a plurality of inner connection ports 74 and a plurality of outer connection ports 75.

[0089] The plurality of inner connection ports 74 are formed on the inner surface 701 of the low-pressure pipe connector 71. The pipe base end portions of some of the plurality of inner low-pressure pipes 30 among the plurality of inner low-pressure pipes 30 are connected to the plurality of inner connection ports 74. As shown in FIGS. 6 and 7, through holes 504 are formed in the cover plate 50 at positions corresponding to the plurality of inner connection ports 74. Thereby, the plurality of inner connection ports 74 are exposed to the space between the cover plate 50 and the left side surface 221 of the second boom component 22 through the through holes 504. This enables the pipe base end portions of the plurality of inner low-pressure pipes 30 disposed inside the cover plate 50, that is, in the space between the cover plate 50 and the left side surface 221 of the second boom component 22, to be respectively connected to the plurality of inner connection ports 74.

[0090] The plurality of outer connection ports 75 are formed on the side surface 703 of the low-pressure pipe connector 71. The pipe tip end portions of some of the plurality of outer low-pressure pipes 30A among the plurality of outer low-pressure pipes 30A are connected to the plurality of outer connection ports 75. Thereby, the outer low-pressure pipes 30A are respectively connected to the inner low-pressure pipes 30 via the low-pressure pipe connector 71.

[0091] The low-pressure pipe connector 72 is a connector capable of connecting a plurality of inner low-pressure pipes 30 and a plurality of outer low-pressure pipes 30B. As shown in FIGS. 5 and 6, the low-pressure pipe connector 72 is supported by a cover plate 50. Specifically, the low-pressure pipe connector 72 is disposed at a position closer to the plate tip region R3 than the plate base end region R1. More specifically, the low-pressure pipe connector 72 is disposed at the most distal end side (left side in FIG. 5) of the cover plate 50.

[0092] The low-pressure pipe connector 72 has a plurality of connection ports 76 and a plurality of connection ports 77. The pipe tip portions of the plurality of inner low-pressure pipes 30 are connected to the plurality of connection ports 76. The pipe base end portions of the plurality of outer low-pressure pipes 30B are connected to the plurality of connection ports 77. Thereby, the outer low-pressure pipes 30B are respectively connected to the inner low-pressure pipes 30 via the low-pressure pipe connector 72.

[0093] The pipe base end portions of some of the plurality of inner low-pressure pipes 30 are connected to a pressure release connector 60, and the pipe base end portions of the remaining inner low-pressure pipes 30 among the plurality of inner low-pressure pipes 30 are connected to a low-pressure pipe connector 71. The inner low-pressure pipes 30 connected to the pressure release connector 60 are pipes that need to perform pressure release to reduce the pressure inside the inner low-pressure pipes 30 during the assembly or disassembly work of the work attachment 20.

[0094] The pipe tip portions of some of the plurality of outer low-pressure pipes 30A are respectively connected to the pressure release connector 60, and the pipe tip portions of the remaining outer low-pressure pipes 30A among the plurality of outer low-pressure pipes 30A are respectively connected to the low-pressure pipe connector 71. The pipe tip portions of the plurality of inner low-pressure pipes 30 and the pipe base end portions of the plurality of outer low-pressure pipes 30B are respectively connected to the low-pressure pipe connector 72.

[0095] The plurality of outer high-pressure pipes 40 are respectively connected to the pressure-release connectors 60. Specifically, as shown in FIGS. 3 and 7, each of the plurality of outer high-pressure pipes 40 is connected to the pressure-release connector 60 via a branch pipe 65 branched from a high-pressure pipe connector 40CN attached to the pipe base end portion thereof.

[0096] As shown in FIG. 6, the pipe protection unit UN1 further includes an oil engine 80. The oil engine 80 includes a valve for switching between an operating oil supply circuit to the pin removal and insertion device and an operating oil supply circuit to the rotary hydraulic motor. The oil engine 80 is connected to some of the plurality of inner low-pressure pipes 30. The oil engine 80 includes a lever 81. An operator can switch between the above two supply circuits by operating the lever 81. The above two supply circuits may share some pipes. The pin removal and insertion device and the rotary hydraulic motor are operated by an operating device, for example, near the driver's seat in the cab 12A. Although not shown, other oil engines other than the oil engine 80 may be arranged in the inner space between the cover plate 50 and the left side surface 221 of the second boom component 22. In this case, the other oil engine is protected by the cover plate 50.

[0097] A through hole 505 is formed in the cover plate 50 at a portion corresponding to the oil engine 80. The oil engine 80 is fixed to the outer plate surface 501 of the cover plate 50. The oil engine 80 has an inner surface facing the outer plate surface 501 of the cover plate 50 and an outer surface opposite to the inner surface. A plurality of connection ports are formed on the inner surface of the oil engine 80, and a plurality of inner low-pressure pipes 30 are connected to the connection ports through the through hole 505. Since the lever 81 of the oil engine 80 is arranged on the outer side (left side) of the cover plate 50, an operator can easily operate the lever 81.

[0098] The right side view of FIG. 10 depicts the second boom component 22, the plurality of high-pressure pipes, the plurality of low-pressure pipes, and the cover plate 50. FIG. 11 is a right side view of FIG. 10 with the illustration of the plurality of high-pressure pipes omitted.

[0099] The pipe protection unit UN2 shown in FIGS. 10 and 11 has the same basic structure as the above-described pipe protection unit UN1. That is, the pipe protection unit UN2 includes a plurality of low-pressure pipes, a plurality of high-pressure pipes, and a cover plate 50. The plurality of low-pressure pipes include a plurality of inner low-pressure pipes 30 as shown in FIG. 11, for example, and the plurality of high-pressure pipes include a plurality of outer high-pressure pipes 40 as shown in FIG. 10, for example. The plurality of inner low-pressure pipes 30 are hydraulic pipes arranged along the right side surface 222 (an example of an attachment side surface) of the second boom component 22. The plurality of outer high-pressure pipes 40 are hydraulic pipes arranged along the right side surface 222 outside the plurality of inner low-pressure pipes 30. The plurality of outer high-pressure pipes 40 have an outer diameter larger than that of the plurality of inner low-pressure pipes 30. The cover plate 50 is a plate arranged along the right side surface 222 so as to be interposed between the plurality of inner low-pressure pipes 30 and the plurality of outer high-pressure pipes 40 and supported by the work attachment 20. The cover plate 50 covers at least a part of each of the plurality of inner low-pressure pipes 30.

[0100] FIG. 12 depicts a third boom component 23, a plurality of high-pressure pipes, a plurality of low-pressure pipes, and two cover plates 50A, 50B. FIG. 13 is a left side view omitting the illustration of the plurality of high-pressure pipes in FIG. 12.

[0101] Since the pipe protection unit UN3 shown in FIGS. 12 and 13 has the same basic structure as the above-described pipe protection unit UN1, a detailed description thereof is omitted. This pipe protection unit UN3 is different from the pipe protection unit UN1 in that it includes a plurality of cover plates 50A, 50B.

[0102] Each of the cover plates 50A and 50B is a plate that is arranged along the attachment side surface so as to be interposed between the plurality of inner low-pressure pipes 30 and the plurality of outer high-pressure pipes 40, and is supported by the work attachment 20. Each of the cover plates 50A and 50B covers at least a part of each of the plurality of inner low-pressure pipes 30. The cover plate 50A and the cover plate 50B are arranged at intervals from each other. The cover plate 50A covers the pipe base ends of the plurality of inner low-pressure pipes 30 and the vicinity thereof. The cover plate 50B covers the pipe tip ends of the plurality of inner low-pressure pipes 30 and the vicinity thereof.

[0103] The pipe protection unit UN3 further includes a cover 55. This cover 55 covers not only the plurality of inner low-pressure pipes 30 but also a part of the plurality of high-pressure pipes 40. This cover 55 is optional.

[0104] As described above, in each of the pipe protection units UN1, UN2, and UN3 according to the present embodiment, each of the plurality of inner low-pressure pipes 30 is protected by a plurality of outer high-pressure pipes 40 having a higher strength arranged outside the inner low-pressure pipes 30 and a cover plate 50 that is interposed between the plurality of inner low-pressure pipes 30 and the plurality of outer high-pressure pipes 40 and covers at least a part of each of the plurality of inner low-pressure pipes 30.

[0105] Each of the pipe protection units UN1, UN2, and UN3 further includes a pressure relief connector 60 supported by a cover plate 50, so that the parts for relieving the pressure inside each of the outer high-pressure pipe 40 and the inner low-pressure pipe 30 can be aggregated at the pressure relief connector 60 in each of the pipe protection units UN1, UN2, and UN3. That is, the operator can perform the pressure relief operation of the outer high-pressure pipe 40 and the inner low-pressure pipe 30 at one location. Thereby, in the disassembly operation of the work attachment 20 performed by the operator using, for example, an aerial work vehicle, the workability of the pressure relief operation of the outer high-pressure pipe 40 and the inner low-pressure pipe 30 is improved. On the other hand, in the pipe protection unit, when there are a plurality of parts for relieving the pressure inside the outer high-pressure pipe 40 and the inner low-pressure pipe 30, it is necessary to move the aerial work vehicle for each of the plurality of parts, and to deploy and store the platform on which the operator rides on the aerial work vehicle for each of the plurality of parts, which is time-consuming.

[0106] The pressure relief connector 60 is disposed at a position corresponding to the lower part of the cover plate 50 in a state where the work attachment 20 is disposed in a lying posture in which the work attachment 20 extends along the ground G. Therefore, the operator can more easily perform a pressure relief operation for relieving the pressure inside the outer high-pressure pipe 40 and the inner low-pressure pipe 30 from a plurality of pressure relief connection ports 64 (high-pressure pipe pressure relief ports) and a plurality of pressure relief connection ports 63 (low-pressure pipe pressure relief ports) of the pressure relief connector 60 in the vicinity of the left side surface or the right side surface of the work attachment 20 disposed in the lying posture.

[0107] The plurality of pressure relief connection ports 64 and the plurality of pressure relief connection ports 63 are disposed below the lowermost outer high-pressure pipe 40 among the plurality of outer high-pressure pipes 40 in a state where the work attachment 20 is disposed in the lying posture. Therefore, when the operator connects the hose to the pressure relief connection port 64 and the pressure relief connection port 63 in the vicinity of the left side surface or the right side surface of the work attachment 20 disposed in the lying posture, the plurality of outer high-pressure pipes 40 do not get in the way, so that the workability of the pressure relief operation is further improved.

[0108] In this embodiment, a plurality of inner low-pressure pipes 30 are arranged in an inner space which is the space between the cover plate 50 and the attachment side surface, and the inner ends of these inner low-pressure pipes 30 can be connected to inner connection ports formed on the inner surface of the pressure-relief connector 60 (the inner surface facing the attachment side surface). And since the pressure-relief connector 60 is fixed to the plate outer surface 501 of the cover plate 50, it is not necessary to secure a space for arranging the pressure-relief connector 60 in the inner space. Thereby, it is possible to suppress an increase in the inner space. Also, since the pressure-relief connector 60 is fixed to the plate outer surface 501 of the cover plate 50, the work of attaching the pressure-relief connector 60 to the cover plate 50 becomes easy.

[0109] Since the cover plate 50 has a through-hole 503 formed in a region corresponding to the inner connection port, while arranging the pressure-relief connector 60 within the range of the cover plate 50 in a side view, the inner end of the inner low-pressure pipe 30 can be connected to the inner connection port of the pressure-relief connector 60 through the through-hole 503.

[0110] The pressure-relief connector 60 further has an outer connection port which is a connection port arranged outside the cover plate 50 and to which the outer end is connected. That is, the pressure-relief connector 60 can not only function to relieve the pressure inside the inner low-pressure pipe 30, but also connect the inner low-pressure pipe 30 to the outer low-pressure pipe 30A. The inner low-pressure pipe 30 and the outer low-pressure pipe 30A constitute a part of the low-pressure pipe circuit, and the pressure-relief connector 60 can lead out a part of the low-pressure pipe circuit from the inside to the outside of the cover plate 50.

[0111] Each of the pipe protection units UN1, UN2, and UN3 further includes a plurality of fixing parts for fixing a plurality of outer high-pressure pipes 40 to the cover plate 50. Since the plurality of outer high-pressure pipes 40 are fixed to the cover plate 50, in the operation of attaching each of the pipe protection units UN1, UN2, and UN3 to the attachment side surface and the operation of removing each of the pipe protection units UN1, UN2, and UN3 from the attachment side surface, the handling of each of the pipe protection units UN1, UN2, and UN3 becomes easy.

[0112] Each of the pipe protection units UN1, UN2, and UN3 is connected to a plurality of outer high-pressure pipes 40 and further includes a plurality of flexible high-pressure pipes 40F having flexibility. One end of the flexible high-pressure pipe 40F is stably supported by the cover plate 50 via the outer high-pressure pipe 40 fixed to the cover plate 50, and the flexible high-pressure pipe 40F itself has flexibility. Therefore, the operation of connecting the flexible high-pressure pipe 40F to another high-pressure pipe and the operation of removing the flexible high-pressure pipe 40F from the another high-pressure pipe become easy.

[0113] In the present embodiment, each of the pipe protection units UN1, UN2, and UN3 can be pre-assembled before being attached to the attachment side surface of the work attachment 20. Thereby, the assemblability of each pipe protection unit is improved.

[0114] In the present embodiment, since the plurality of outer high-pressure pipes 40 are fixed to the cover plate 50 and the plurality of inner low-pressure pipes 30 are supported by the cover plate 50 via the plurality of connectors 71, 72, welding for fixing these pipes does not need to be performed on the attachment side surface. Thereby, the number of welding points on the attachment side surface can be reduced. This enables cost reduction by simplifying the welding operation and reducing the strength risk of the attachment.

[0115] In this embodiment, the inner low-pressure pipe 30 can be led to the outside of the cover plate 50 via the connector 60 and the connector 71. Therefore, it is possible to reduce the inner space, facilitate the routing of the pipes, and facilitate the assembly of the pipe protection unit.

[0116] In this embodiment, since the pressure-release connector 60 is arranged outside the cover plate 50, the pressure-release operation becomes easy.

[0117] [Modification Example] Although the working machine according to the embodiment of the present disclosure has been described above, the present disclosure is not limited to the above embodiment and includes, for example, the following modification examples.

[0118] (A) Regarding the working machine The working machine to which the pipe protection unit according to the present disclosure is applied is not limited to the disassembling machine, and may be other working machines such as a hydraulic excavator.

[0119] (B) Regarding the tip working device The tip working device in the above embodiment is a crushing device, but the tip working device in the present disclosure may be other tip working devices such as a breaker, a lifting magnet, and a bucket.

[0120] (C) Regarding the pipe protection unit The working machine 100 according to the above embodiment includes a plurality of pipe protection units, but the working machine only needs to include at least one pipe protection unit according to the present disclosure.

[0121] (D) Regarding the working attachment The working attachment 20 according to the above embodiment includes a boom 20A, a connecting member 25, an arm 20B, and a tip working device 28, but the connecting member 25 can be omitted. In this case, the arm is rotatably attached to the tip of the boom.

[0122] (E) Regarding the inner low-pressure pipe and the outer high-pressure pipe In the above embodiment, a plurality of inner low-pressure pipes 30 are arranged inside the cover plate 50, and a plurality of outer high-pressure pipes are arranged outside the cover plate 50. However, the present invention is not limited to such a form. At least one inner low-pressure pipe 30 may be arranged inside the cover plate 50, and at least one outer high-pressure pipe 40 may be arranged outside the cover plate 50.

[0123] (F) Regarding the pressure-release connector The pressure-release connector may be supported not on the cover plate 50 but on a portion of the attachment side surface facing the cover plate 50.

Explanation of reference numerals

[0124] 10: Base machine 20: Working attachment 22L, 23L: Left side plates 22R: Right side plate 30: Inner low-pressure pipe 30A: Outer low-pressure pipe 30B: Outer low-pressure pipe 40: Outer high-pressure pipe 40F: Flexible high-pressure pipe 41: Fixing member 42: Support column 50, 50A, 50B: Cover plates 60: Pressure-release connector 100: Working machine 221: Left side surface (an example of the attachment side surface) 222: Right side surface (an example of the attachment side surface) 231: Left side surface (an example of the attachment side surface) 501: Outer plate surface 502: Inner plate surface UN1, UN2, UN3: Pipe protection unit

Claims

1. A working machine comprising a base machine, a working attachment supported by the base machine, and a pipe protection unit, wherein the pipe protection unit at least one inner low-pressure pipe which is a hydraulic pipe arranged along an attachment side surface which is one of the left side surface and the right side surface of the working attachment, at least one outer high-pressure pipe which is a hydraulic pipe arranged along the attachment side surface outside the at least one inner low-pressure pipe and has an outer diameter larger than that of the at least one inner low-pressure pipe, a cover plate which is arranged along the attachment side surface so as to be interposed between the at least one inner low-pressure pipe and the at least one outer high-pressure pipe and is supported by the working attachment and covers at least a part of the at least one inner low-pressure pipe, the attachment side surface, the at least one inner low-pressure pipe, the cover plate, and the at least one outer high-pressure pipe are arranged in this order in the left-right direction, the working machine.

2. A working machine comprising a base machine, a working attachment supported by the base machine, and a pipe protection unit, wherein the pipe protection unit at least one inner low-pressure pipe which is a hydraulic pipe arranged along an attachment side surface which is one of the left side surface and the right side surface of the working attachment, at least one outer high-pressure pipe which is a hydraulic pipe arranged along the attachment side surface outside the at least one inner low-pressure pipe and has an outer diameter larger than that of the at least one inner low-pressure pipe, a cover plate which is arranged along the attachment side surface so as to be interposed between the at least one inner low-pressure pipe and the at least one outer high-pressure pipe and is supported by the working attachment and covers at least a part of the at least one inner low-pressure pipe, a pressure relief connector for relieving the pressure inside the at least one outer high-pressure pipe and relieving the pressure inside the at least one inner low-pressure pipe, and the pressure relief connector is supported by the cover plate or a portion of the attachment side surface facing the cover plate, the working machine.

3. The working machine according to claim 2, wherein The pressure-relief connector has a high-pressure pipe pressure-relief port for relieving the pressure inside the at least one outer high-pressure pipe, and a low-pressure pipe pressure-relief port for relieving the pressure inside the at least one inner low-pressure pipe. The pressure-relief connector is arranged at a position corresponding to the lower part of the cover plate in a state where the work attachment is arranged in a lying posture in which the work attachment extends along the ground.

4. The working machine according to claim 3, The at least one outer high-pressure pipe includes a plurality of outer high-pressure pipes. The high-pressure pipe pressure-relief port and the low-pressure pipe pressure-relief port are arranged below the lowermost outer high-pressure pipe among the plurality of outer high-pressure pipes in a state where the work attachment is arranged in the lying posture.

5. The working machine according to any one of claims 2 to 4, The cover plate has an outer surface on the side opposite to the side surface of the attachment, and a plate outer surface to which the pressure-relief connector is fixed. The pressure-relief connector has an inner surface facing the side surface of the attachment, and an inner connection port formed on the inner surface and connected to an inner end portion which is one end portion of the at least one inner low-pressure pipe.

6. The working machine according to claim 5, The cover plate has a through hole formed in a region corresponding to the inner connection port.

7. The working machine according to any one of claims 2 to 6, The pipe protection unit further includes at least one outer low-pressure pipe which is a hydraulic pipe connected to the at least one inner low-pressure pipe via the pressure-relief connector and has an outer end portion arranged outside the cover plate. The pressure-relief connector further has an outer connection port arranged outside the cover plate and connected to the outer end portion.

8. The working machine according to any one of claims 1 to 7, The pipe protection unit further includes a fixing portion for fixing the at least one outer high-pressure pipe to the cover plate, and the fixing portion is attached to the cover plate.

9. The working machine according to claim 8, The piping protection unit is a working machine that is connected to the at least one outer high-pressure pipe and further includes at least one flexible high-pressure pipe having flexibility.

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