JP6868940B2 - Construction machinery - Google Patents

Description

The present invention relates to a construction machine such as a hydraulic excavator provided with a clamp device capable of densely laying out a plurality of hydraulic pipes in an easy procedure.

Since many construction machines such as hydraulic excavators are equipped with many hydraulic actuators to drive many operating devices including working machines, it is necessary to lay a large number of hydraulic pipes in various parts of the machine. In particular, for models that are transported on a transport vehicle such as a trailer, a huge number of in-vehicle devices including electrical components are laid out precisely in order to keep the aircraft dimensions within the transport limit dimensions, and steel pipes and steel pipes are used in tight piping spaces. Numerous hydraulic pipes, including hoses, must be densely laid.

On the other hand, there is a clamp device that can contribute to a three-dimensional and dense layout of hydraulic pipes by laying hydraulic pipes in two stages on the upper surface of the boom and gripping them (see Patent Document 1 and the like). The clamp device of Patent Document 1 adds an extension plate in addition to the first-stage and second-stage clamps. In this clamp device, a cantilever-shaped extension plate is bolted with a first-stage clamp sandwiched between a screw seat provided on the wall surface of the work machine. The second-stage clamp is separately bolted to the upper part on the tip side of the cantilever-shaped extension plate so as to avoid the bolt and deviate from the first-stage clamp.

JP-A-2002-327453

However, in the clamp device of Patent Document 1, an extension plate is superposed on the upper part of the first-stage clamp, and the bolt must be screwed into the screw seat through the extension plate and the first-stage clamp. The extension plate requires strength to support the second-stage clamp in a cantilever manner, and also serves as a screw seat for a bolt that fixes the second-stage clamp, so that the extension plate requires a thickness. Therefore, the bolt penetrating the extension plate is naturally long. In this way, the first-stage clamp must be fixed with a long bolt, and the force applied to the extension plate via the second-stage clamp acts on this long bolt as a moment load, resulting in violent vibration. There is a lack of structural strength of the clamp in construction machinery. There is a risk that the load on the base material (the outer wall of the work machine, the structure of the construction machine to which the screw seat is welded) due to the moment load acting on the first-stage screw seat will also increase. If the piping layout has three or more stages, it is necessary to further stack an additional plate on the second-stage clamp, and the problem of moment load becomes more remarkable. In addition, the clamping device becomes heavy because a sturdy structure for supporting the above-mentioned moment load is required. Since there are many clamps, the effect of increasing the amount of each clamp on the weight of the work equipment cannot be ignored.

In addition, the first-stage clamp cannot be directly bolted to the screw seat, and must be bolted while being held down by the extension plate. This is a work that requires the skill of supporting the first-stage clamp while holding the hydraulic pipe to be fixed, stacking an extension plate on the clamp, and screwing the bolt further. In the first place, the number of parts that make up the clamp device increases as the additional plate is added, and the man-hours required for disassembling and assembling each clamp device increase. As mentioned above, since the number of clamps used in construction machinery is large, the man-hours required for plumbing work will increase accordingly.

An object of the present invention is to provide a construction machine provided with a clamping device capable of densely laying out a plurality of hydraulic pipes in an easy procedure.

In order to achieve the above object, the present invention presents the machine body, the work machine attached to the machine body, the prime mover provided in the machine body, the hydraulic pump driven by the prime mover, and the pressure oil discharged from the hydraulic pump. In a construction machine provided with a plurality of hydraulic actuators driven by, a plurality of hydraulic pipes connecting the hydraulic pump and the corresponding hydraulic actuators, and a plurality of clamp devices for gripping the hydraulic pipes, at least the plurality of clamp devices. One grips the hydraulic pipe by sandwiching it between two semi-cracked members and a base frame fixed in a posture extending orthogonally to the body wall surface of the machine body or the wall surface of the work machine. comprising a plurality of clamps, and a plurality of fasteners for securing said clamp to said base frame, said base frame, a distance from the machine body wall fitted with this adjacent in the extending direction of the different Do Ri said hydraulic pipe It is formed in a stepped shape including a plurality of seating surfaces parallel to each other, and one clamp is provided corresponding to each of the plurality of seating surfaces of the base frame, and pipes are installed on both sides of the base frame. It is characterized in that it has a grip portion and is configured to be fixed by the fixture to a corresponding seat surface at a connecting portion that connects the pipe grip portions on both sides.

According to the present invention, two hydraulic pipes can be gripped by each clamp with the base frame interposed therebetween, and these two hydraulic pipes can be arranged in two stages. Therefore, a plurality of hydraulic pipes can be laid out densely. In addition, the clamp device has a simple structure having a single base frame and a plurality of clamps as main elements, and is extremely easy to manufacture because the base frame is single. Further, since the base frame is provided with a plurality of different seat surfaces corresponding to each clamp, the clamps gripping the hydraulic pipes can be independently fixed to the seat surface with fixtures. Therefore, the piping work can be performed efficiently and easily. Further, each clamp grips two hydraulic pipes with the base frame in between, and is supported by the base frame at a position between the two hydraulic pipes. With such a configuration, a well-balanced and highly stable support structure can be obtained. Further, since the support structure that supports each clamp is only one base frame, the support strength of the hydraulic pipe is strong, there are few places requiring welding, and cracks are unlikely to occur. In this way, it is excellent as a support structure both structurally and in terms of balance. In addition, unlike the structure in which the number of components of the foundation structure that supports the clamp increases according to the number of seating surfaces, increasing the number of stages of the seating surface of the base frame makes it flexible to increase the number of hydraulic pipes to be gripped. Can correspond to.

Side view of a construction machine according to an embodiment of the present invention Side view of the work machine provided in the construction machine of FIG. 1 in an extended state. The figure which shows the main part of the hydraulic piping which constitutes the attachment drive circuit provided in the construction machine of FIG. Side view of the working machine provided in the construction machine of FIG. 1 in a held state. A perspective view of the clamp device attached to the side surface of the work machine of the construction machine of FIG. 1 as viewed from the rear. Top view of the clamp device of FIG. 5 as viewed from above. A perspective view of the clamp device of FIG. 5 as viewed from the front.

Embodiments of the present invention will be described below with reference to the drawings.

-Construction machinery-
FIG. 1 is a side view of a construction machine according to an embodiment of the present invention. Hereinafter, the front of the operator sitting in the driver's seat (left side in FIG. 1) is referred to as the front of the swivel body 12. In the figure, the working machine is illustrated by seeing through a part of the driver's cab. FIG. 1 illustrates a so-called short reach type hydraulic excavator as a construction machine. The illustrated construction machine includes a machine body 10 and a working machine 20 attached to the machine body 10. The machine body 10 is composed of a traveling body 11 and a turning body 12.

The traveling body 11 forms the base structure of the construction machine, and may be a wheel type traveling body, but in the present embodiment, a crawler type traveling body provided with left and right crawler belts 13 is used. The base structure is not limited to a traveling body, and a hull or a pedestal fixed to the ground may be used. The left and right tracks 13 are driven by the left and right traveling drive devices 14, respectively. The traveling drive device 14 includes a hydraulic motor and a speed reducer. The swivel body 12 is provided on the traveling body 11 via a swivel wheel 15, and by driving the swivel wheel 15 with a swivel motor (not shown), the swivel body 12 is provided with respect to the traveling body 11 about a vertically extending shaft. And turn. The swivel motor is a hydraulic motor, but in addition to the case where an electric motor is used, there are also cases where a hydraulic motor and an electric motor are used in combination.

The swivel body 12 includes a swivel frame 16, a driver's cab 17, a machine room 18, a counterweight 19, and the like. The swivel frame 16 is a base frame of the swivel body 12 and supports each device mounted on the swivel body 12. The driver's cab 17 is located on one side in the left-right direction in the front portion of the swivel frame 16, and is located on the left side in this example, but may be arranged on the right side. In the driver's cab 17, a driver's seat (not shown) on which the operator sits, an operating device operated by the operator, and the like are arranged. The machine room 18 is arranged behind the driver's cab 17 in the swivel frame 16. The machine room 18 houses a prime mover 18a, which is an engine (internal combustion engine), a hydraulic pump 18b driven by the prime mover 18a, a control valve for controlling hydraulic oil for driving each hydraulic actuator mounted on the vehicle, heat exchangers, and the like. Has been done. An electric motor may be used for the prime mover 18a. Further, although not shown, tanks are arranged on the side opposite to the driver's cab 17 with the working machine 20 in the front part of the swivel frame 16 interposed therebetween. The tanks include a fuel tank, a hydraulic oil tank, and the like. The counter weight 19 is a weight that balances the weight with the working machine 20, and is supported by the rear end of the swivel frame 16. The counterweight 19 is located in front of the rear end of the traveling body 11 in a state where the traveling direction of the rotating body 12 and the traveling direction of the traveling body 11 coincide with each other (the state shown in FIG. 1). As a result, the maximum turning radius of the turning body 12 is suppressed to the same extent as, for example, the vehicle width of the traveling body 11 or slightly larger (for example, 20%). Therefore, when the swivel body 12 is swiveled in a narrow environment where the work space is limited, the rear end of the swivel body 12 swivels with a turning radius of about the width of the vehicle and contact with surrounding objects is suppressed, and as a result, the swivel body 12 turns. The operation environment is easy to operate. A hydraulic excavator provided with such a swivel body 12 is called a rear small swivel machine. Since the rear end side of the swivel body 12 is restricted in this way, the equipment layout arranged on the swivel body 12 is dense. For example, the prime mover 18a is arranged so as to partially overlap the swivel wheel 15 when viewed from above. Has been done.

-Working machine-
FIG. 2 is a side view of the working machine. As shown, the working machine 20 is an articulated front working device including a boom 21, an arm 22, an attachment 23, a boom cylinder 24, an arm cylinder 25, and an attachment cylinder 26.

The boom 21 is the basic structure of the working machine 20, and is bent so that the front portion 21c (the portion on the tip end side) tilts forward with respect to the rear portion 21a (the portion on the proximal end side) via the bent portion 21b. It is configured as a boomerang type that is convex upward when viewed from the side. The boom 21 is rotatably connected in the vertical direction to a bracket 16a provided at a position on the side (right side in this example) of the driver's cab 17 in the front portion of the swivel frame 16 via a pin 21p extending to the left and right. ing. In the present embodiment, the boom 21 is arranged on the right side of the driver's cab 17, but the driver's cab 17 may be arranged on the right side in the front part of the swivel body 12, and the boom 21 may be arranged on the left side of the driver's cab 17. .. Unlike the boom 21, the arm 22 has a linear shape as a whole, and is rotatably connected to the tip of the boom 21 via a pin 22p extending to the left and right. The attachment 23 is rotatably connected to the tip of the arm 22 via a pin 23p extending to the left and right. The attachment 23 is an actuated work tool equipped with a hydraulic actuator 27, and FIGS. 1 and 2 illustrate a case where a crusher for crushing an object to be dismantled by sandwiching it like a crab scissors is attached to the arm 22 as the attachment 23. ing. The attachment 23 can be replaced with another actuating attachment having a hydraulic actuator such as a breaker, or a non-actuating attachment not equipped with a hydraulic actuator such as a bucket.

In the following description, of the outer wall surface of the boom 21, the surface facing upward (the surface facing the boom raising direction) in the posture in which the work machine 20 is extended forward is the back side surface of the boom 21, and the surface facing downward (boom). The surface facing the lowering direction) is appropriately described as the ventral side surface of the boom 21. Further, of the outer wall surface of the arm 22, the surface facing upward (the surface facing the arm dump direction) with the work machine 20 extended forward is the back side surface of the arm 22, and the surface facing downward (facing the arm cloud direction). The surface) is appropriately described as the ventral side surface of the arm 22. Headlights 28 (FIG. 2) are provided on the left and right side surfaces of the front portion 21c of the boom 21 so that all of them are located between the back side surface and the ventral side surface of the front portion 21c when viewed from the left and right.

The boom cylinder 24 is a hydraulic cylinder that drives the boom 21 and rotates it up and down, and is provided one on each side of the boom 21. The base end portions (bottom side end portions in this example) of the left and right boom cylinders 24 are rotatably connected to the bracket 16a of the swivel frame 16 via pins 24p extending to the left and right. The tip of the boom cylinder 24 (in this example, the end on the rod side) is rotated to the side surface of the middle portion (base end side of the headlight 28) of the front portion 21c of the boom 21 via a pin 24q extending to the left and right. It is connected freely.

The arm cylinder 25 is a hydraulic cylinder that drives the arm 22 and rotates it back and forth, and is arranged on the ventral side surface side (lower side) of the boom 21 and the arm 22. The arm cylinder 25 is generally configured to perform an arm cloud operation with a large load during an extension operation, which is advantageous in terms of output in comparison with the pressure receiving area of the cylinder, but a configuration in which the arm cloud operation is intentionally performed by a contraction operation. There is. This is to expand the work range in the restricted work space. By arranging the boom 21 and the arm 22 on the ventral side surface side, the boom 21 and the arm 22 protect the arm cylinder 25 from falling objects during work. Further, the arm cylinder 25 does not interfere with an obstacle above the tunnel ceiling or the like, and the arm cylinder 25 does not get in the way when excavating the vicinity of the tunnel ceiling or the like. The base end portion (bottom side end portion in this example) of the arm cylinder 25 is rotatably connected to a bracket 21x provided on the ventral side surface of the rear portion 21a of the boom 21 via a pin 25p extending to the left and right. .. The tip end portion (end portion on the rod side in this example) of the arm cylinder 25 is rotatably connected to a bracket 22x provided on the ventral side surface of the arm 22 via a pin 25q extending to the left and right.

The attachment cylinder 26 is a hydraulic cylinder that drives and rotates the attachment 23, and is arranged on the back side surface side of the arm 22 in this embodiment. The base end portion (bottom side end portion in this example) of the attachment cylinder 26 is rotatably connected to the back side surface of the base portion side of the arm 22 via a pin 26p extending to the left and right. The pin 26p that supports the base end side of the attachment cylinder 26 is located closer to the base end side of the arm 22 than the pin 22p that connects the arm 22 and the boom 21. The tip of the attachment cylinder 26 (the end on the rod side in this example) is connected to the tip of the arm 22 and the attachment 23 via a link 29. The tip of the attachment cylinder 26 and the link 29 are connected by a pin 26q extending to the left and right. Although not shown, a cover may be provided on the back side surface side of the arm 22 to cover and protect the left and right sides and the upper side (opposite side of the arm 22) of the attachment cylinder 26.

In the work machine 20 having the above configuration, the boom 21 and the arm 22 are particularly shorter than the work machine of a general hydraulic excavator of the same vehicle class, and the reach is shortened. For example, the total length of the boom 21 (distance between the pins 21p and 22p) is shorter than the total length of the machine body 10 (the front-rear length of the traveling body 11). Similarly, the total length of the arm 22 (distance between the pins 22p and 23p) is shorter than the total length of the machine body 10. Further, the operating range of the boom 21 may be limited so that the rear portion 21a of the boom 21 does not tilt backward beyond the vertical even in the fully extended state of the boom cylinder 24. In this case, when the boom cylinder 24 is extended and leveled, the boom 21 and the driver's cab 17 on the swivel body 12 are arranged so that the back side surface of the front portion 21c of the boom 21 is at the same height as the upper surface of the driver's cab 17. The positional relationship of is set. This is a consideration for avoiding interference with obstacles above the boom 21 and the arm 22.

-Piping layout-
Along the outer wall surface of the work machine 20, the arm cylinder drive circuit, the attachment cylinder drive circuit, and the hydraulic pipes 31 to 33 of the attachment drive circuit are laid. The arm cylinder drive circuit is an arm cylinder 25, the attachment cylinder drive circuit is an attachment cylinder 26, and the attachment drive circuit is a hydraulic circuit that drives a hydraulic actuator 27 mounted on the attachment 23. The hydraulic pipes 31 to 33 are configured by adding a fixed pipe (for example, a steel pipe) and a hydraulic hose. The hydraulic hose does not require any other flexibility in the parts of the paths of the hydraulic pipes 31 to 33 that require flexibility, such as the parts that straddle the joints of the work machine 20 and the parts that connect to the hydraulic actuators. Fixed piping is used for the part. Each of the fixed pipes constituting the hydraulic pipes 31 to 33 is fixed to the outer wall surface of the work machine 20 by a clamp device 40 at an appropriate position.

The hydraulic pipes 31 to 33 of the hydraulic circuit connect the corresponding hydraulic actuators and the hydraulic pumps 18b via the control valves mentioned above. The path from the control valve to the corresponding hydraulic actuator will be described for the hydraulic pipes 31 to 33. The hydraulic pipes 31 to 33 are first routed from the control valve along the back side surface of the rear portion 21a of the boom 21. Like the arm cylinder 25, the hydraulic pipes 31 to 33 are laid so as to avoid the back side surface of the front portion 21c of the boom 21 as described later, and the hydraulic pipes do not exist on the back side surface of the front portion 21c.

Of the hydraulic pipes 31 to 33 laid on the back side of the rear portion 21a of the boom 21, the two hydraulic pipes 31 of the arm cylinder drive circuit are visible from the driver's cab 17 without exceeding the bent portion 21b (the left side of the boom 21 ( It is arranged on the side surface (the side closer to the driver's cab 17). The hydraulic pipe 31 passes through a region on the back side surface side of the pin 24q (tip of the boom cylinder 24) on the left side surface of the front portion 21c of the boom 21, passes the headlight 28, and is a predetermined distance to the boom tip (pin 22p) side. Only extends linearly along the dorsal surface of the boom 21. After that, the hydraulic pipe 31 is turned to the ventral side surface side, and one is connected to the bottom side and one rod side of the tube of the arm cylinder 25. The portion of the hydraulic pipe 31 that straddles the joint between the swivel body 12 and the boom 21 and the portion extending from the boom 21 to the arm cylinder 25 are composed of a hydraulic hose, and the other portion is composed of a fixed pipe.

The two hydraulic pipes 32 of the attachment cylinder drive circuit are routed from the rear portion 21a of the boom 21 to the side surface on the right side (the side far from the driver's cab 17) of the boom 21 without exceeding the bent portion 21b. The hydraulic pipe 32 extends along the right side surface of the rear portion 21a of the boom 21, is routed to the ventral side surface at the bent portion 21b, and extends toward the tip of the boom along the ventral side surface of the front portion 21c of the boom 21. After that, the hydraulic pipe 32 is routed to the side surface on the left side (the side closer to the driver's cab 17) of the boom 21 that can be seen from the driver's cab 17, straddling the joint portion between the boom 21 and the arm 22, and the bottom side of the tube of the attachment cylinder 26. And one is connected to the rod side. The portion of the hydraulic pipe 32 that straddles the joint between the swing body 12 and the boom 21 and the portion that extends from the boom 21 to the attachment cylinder 26 are composed of a hydraulic hose, and the other portion is composed of a fixed pipe.

The hydraulic pipe 33 of the attachment drive circuit is routed to the side surface on the left side (closer to the driver's cab 17) of the boom 21 which can be seen from the driver's cab 17 together with the hydraulic pipe 31 without exceeding the bent portion 21b from the rear portion 21a of the boom 21. Will be done. The hydraulic pipe 33 passes through the area on the left side surface of the front portion 21c of the boom 21 on the back side surface side of the pin 24q, and along with the hydraulic pipe 31 along the back side surface of the boom 21 to the vicinity (proximity range) of the headlight 28. It is laid linearly (main part 35a described later). In this linearly extending portion, the hydraulic pipe 33 is laid out with the hydraulic pipe 31 sandwiched between the left side surface of the boom 21 and is arranged so as to overlap the hydraulic pipe 31 when viewed from the left side as shown in FIG. ing. By arranging them on the left and right instead of arranging them vertically in this way, the hydraulic pipes 31 and 33 are routed on the left side surface of the boom 21 that can be seen from the driver's cab 17, and the side surface of the boom is narrower than the tip of the boom cylinder. It is passed through the area. After that, the hydraulic pipe 33 straddles the joint portion between the boom 21 and the arm 22, and is routed from the left side surface of the arm 22 to the back side surface of the arm 22. The hydraulic pipe 33 is routed separately from the back side surface of the arm 22 to the left and right side surfaces, and is linearly connected to the stop valves 33v fixed to the left and right side surfaces of the arm 22 by the shortest path. Although not shown, the hydraulic pipe 33 extends further toward the tip of the arm from the stop valve 33v, straddles the joint portion between the arm 22 and the attachment 23, and connects to the hydraulic actuator 27. The part of the hydraulic pipe 33 that straddles the joint between the swivel body 12 and the boom 21, the part that straddles the joint between the boom 21 and the arm 22, the part that extends from the arm 22 to the hydraulic actuator 27 is a hydraulic hose, and the other parts are fixed pipes. It is configured (described later). Next, the hydraulic piping 33 of the attachment drive circuit will be supplementarily described.

-Attachment drive circuit hydraulic piping (main part)-
FIG. 3 is a diagram showing a main part of a hydraulic pipe constituting an attachment drive circuit provided in the construction machine of FIG. As can be seen with reference to FIGS. 2 and 3, the hydraulic pipe 33 of the attachment drive circuit is configured to have a thicker diameter (inner diameter and outer diameter) than the hydraulic pipe 31 in order to ensure pressure resistance. The hydraulic pipe 33 includes a boom fixing pipe 35, an arm fixing pipe 36 (FIG. 2), and a hydraulic hose 37. The portion of the hydraulic pipe 33 that straddles the joint between the boom 21 and the arm 22 is the hydraulic hose 37, and the path leading to the hydraulic hose 37 along the outer wall surface of the boom 21 is on the arm side of the boom fixing pipe 35 and the hydraulic hose 37. The path is the arm fixing pipe 36.

The boom fixing pipe 35 is a rigid pipe (for example, a steel pipe) having poor flexibility and fixed along the outer wall surface of the boom 21, and is fixed only to the outer wall surface of the boom 21 by the clamp device 40. The boom fixing pipe 35 does not straddle the joint of the work machine 20 or is directly connected to the hydraulic actuator, and the end portion on the swivel body 12 side straddles the joint portion of the boom 21 and the swivel body 12 (not shown). ), And the boom tip side end 35b is connected to the hydraulic hose 37. In the specification of the present application, a portion (the portion shown in FIG. 3) extending linearly along the back side surface of the boom 21 on the left side surface (the side closer to the driver's cab 17) of the boom 21 in the path of the boom fixing pipe 35 is provided. For convenience, it is called the main part 35a. Although manufacturing errors and the like are allowed, in this example, the main portion 35a is piped to the left side surface of the boom 21 in parallel with the back side surface of the boom 21. The boom tip side end portion 35b connected to the hydraulic hose 37 in the boom fixing pipe 35 is located only on the left side surface close to the driver's cab 17 in the left-right direction of the work machine 20, and is boom with respect to the main portion 35a (back side surface). It is bent toward the tip of 21 toward the ventral side surface of the boom 21 at an angle θ. The angle θ is the angle formed by the main portion 35a (center line L1 is shown by a dotted line in FIG. 3) and the boom tip side end portion 35b (center line L2 is shown by a dotted line in FIG. 3) when viewed from the left, that is, a sandwiched angle ( It is less than 180 °), and is set larger than 135 ° in this embodiment. In the present embodiment, the center line L2 is a tangent line of the orbital circle R drawn by the arm base end side end portion of the arm fixing tube 36 or a line extending along the center line L2 as the arm 22 rotates.

The arm fixing pipe 36 is a rigid pipe (for example, a steel pipe) having poor flexibility and fixed along the outer wall surface of the arm 22, and is fixed only to the outer wall surface of the arm 22 by a clamp. The arm fixing pipe 36 also does not straddle the joint of the work machine 20 or is directly connected to the hydraulic actuator, and its base end side end (not shown) is connected to the hydraulic hose 37, and the arm tip on the attachment side is connected. The side end is connected to the stop valve 33v. The end of the arm base end side connected to the hydraulic hose 37 of the arm fixing pipe 36 (center line L3 is shown by a dotted line in FIG. 2) is located only on the left side surface of the work equipment 20 in the left-right direction near the driver's cab 17. The arm 22 is fixed in a posture in which the opening is directed to the ventral side surface side. The center line L3 is a tangent line of the orbital circle R drawn by the arm base end side end portion of the arm fixing tube 36 or a line extending along the center line L3 as the arm 22 rotates.

The hydraulic hose 37 is a flexible hydraulic pipe laid across the connecting portion of the boom 21 and the arm 22. All of the hydraulic hoses 37 are arranged only on the side closer to the cab 17 (the left side in this example) with respect to the work machine 20, and the boom tip side end portion 35b of the boom fixing pipe 35 and the arm of the arm fixing pipe 36 are arranged. The base end side end is connected. Both ends of the hydraulic hose 37 are supported by the boom fixing pipe 35 and the arm fixing pipe 36 via a pipe joint 37a, and the connection portions between the boom fixing pipe 35 and the arm fixing pipe 36 are configured such as a boom 21 and an arm 22. It is in a free state without being fixed to the member. As described above, the part of the hydraulic pipe 32 of the arm cylinder drive circuit that straddles the joint between the boom 21 and the arm 22 is composed of a hydraulic hose, but the hydraulic hose 37 has a larger inner and outer diameters and is thicker and allows for allowable bending. The radius is also large. This is because the structure is such that a large flow rate for operating the hydraulic actuator 27 that drives the large attachment 23 can be passed.

Explaining the piping mode of the hydraulic hose 37 in detail, first, the tip of the hydraulic hose 37 (the end of the connection with the arm fixing pipe 36) is connected to the arm fixing pipe 36 in a posture in which the opening is directed toward the back side surface of the arm 22. Has been done. At the connection with the arm fixing pipe 36, the pipe center line of the hydraulic hose 37 coincides with the center line L3 of the arm fixing pipe 36. The distance between the tip of the hydraulic hose 37 and the rotation fulcrum (pin 26p) of the arm 22, that is, the radius of the orbital circle R is set as small as possible within a range in which the allowable bending radius of the hydraulic hose 37 can be secured. This is to secure the distance between the attachment 23 and the hydraulic hose 37 as long as possible and reduce the possibility that crushed objects, obstacles, etc. interfere with the hydraulic hose 37.

On the other hand, at the connection portion (base end portion) of the hydraulic hose 37 with the boom fixing pipe 35, the pipe center line of the hydraulic hose 37 coincides with the center line L2 of the boom fixing pipe 35. That is, the base end portion of the hydraulic hose 37 is in a posture in which the opening is directed toward the back side surface side of the boom 21 along the tangent line of the above-mentioned orbital circle R and toward the bent portion 21b of the boom 21. It is connected to the. The distance between the base end of the hydraulic hose 37 and the rotation fulcrum (pin 26p) of the arm 22 is longer than the radius of the orbital circle R, and the base end of the hydraulic hose 37 is the tip of the boom cylinder 24 rather than the orbital circle R. It is located near the pin 24q) and the headlight 28. In particular, in the present embodiment, the extension direction (center line L2) of the base end portion of the hydraulic hose 37 extends from the front portion 21c rather than the direction orthogonal to the back side surface of the front portion 21c of the boom 21 when viewed from the left and right. It is arranged at an angle so that it approaches the direction. Specifically, the pipe center line (= center line L2) at the base end of the hydraulic hose 37 and the main portion 35a (= center line L1) of the boom fixing pipe 35 face the tip (pin 24q) of the boom cylinder 24. The angle (= θ) formed by this is larger than 135 °. However, since the boom tip side end portion 35b of the boom fixing tube 35 bends to the ventral side surface side of the boom 21 with respect to the main portion 35a, θ <180 ° (135 ° <θ <180 °).

With the above configuration, in the posture in which the work machine 20 is extended, only the portion of the hydraulic hose 37 from the vicinity of the rotation fulcrum (pin 22p) of the arm 22 to the arm 22 side is along the trajectory circle R as shown in FIG. It extends in an arc shape, and the portion on the boom 21 side extends linearly. In this form, the hydraulic hose 37 has no inflection point. In this state, the lowest point (the most ventral side surface side portion) of the hydraulic hose 37 is located between the arm cylinder 25 and the back side surface of the boom 21 as shown in FIG.

On the other hand, in the posture of the hydraulic hose 37 holding the work machine 20, the portion of the hydraulic hose 37 on the arm 22 side when viewed from the driver's cab 17 side faces the back side surface of the boom 21 as shown in FIG. It folds so that it becomes convex, and shifts to a form in which the S-shape is inverted left and right. The portion of the hydraulic hose 37 on the boom 21 side is also bent so as to be convex toward the back side surface of the boom 21 to form an S shape. As a result, the entire hydraulic hose 37 shifts to a V-shaped cursive form. In this way, in the state where the working machine 20 is held, the hydraulic hose 37 is bent at two points, the tip end portion and the base end portion. In this state, the hydraulic hose 37 slackens downward, but the arm 22 and the attachment 23 move larger than the hydraulic hose 37 to the ventral side surface of the boom 21.

-Clamping device-
FIG. 5 is a perspective view of the clamp device 40 attached to the left side surface of the boom 21 of the work machine 20 as viewed from the rear, FIG. 6 is a plan view of the clamp device 40 as viewed from above, and FIG. 7 is a perspective view of the clamp device 40 as viewed from the front. .. In FIGS. 5 and 6, in order to clearly show the configuration of the clamp device 40, the pipe gripping portions 42g and 43g (described later) on the back side surface side are not shown. Further, in FIG. 7, the hydraulic pipes 31 and 33 are not shown. The configuration of the clamp device 40 described here is applied to at least one of gripping hydraulic pipes (hydraulic pipes 31 to 33 and other hydraulic pipes) connecting the hydraulic pump 18b and the corresponding hydraulic actuator. .. In particular, on the side surface of the boom 21, the main portion 35a of the hydraulic pipe 33 passing through a narrow area on the back side surface side of the tip portion of the boom cylinder 24 and the hydraulic pipe 31 extending along the main portion 35a are arranged in two stages as described above. The clamp device 40 shown in FIGS. 5 to 7 is suitable for gripping with. Hereinafter, with reference to FIGS. 5 to 7, a clamp device 40 for gripping the main portion 35a of the hydraulic pipe 33 and the hydraulic pipe 31 along the main portion 35a on the side surface of the boom 21 will be described. The clamp device 40 includes a base frame 41, a plurality of (two in this example) clamps 42 and 43, and a plurality of (four in this example) fixtures 44.

The base frame 41 is the base structure of the clamp device 40, and is fixed to the wall surface of the base material to be attached (in this example, the left side surface of the front portion 21c of the boom 21) by welding, for example. The base frame 41 is composed of a plate-shaped member, extends orthogonally to the side wall surface of the boom 21, and is parallel to the hydraulic pipe (main portion of the hydraulic pipe 33 and the hydraulic pipe 31 along the main portion) gripped by the clamp device 40. Consists of a plane. In this example, since the vertical left side surface of the boom 21 is used as the base material wall surface, the base frame 41 projects to the left and extends. However, when the base material is another part of the work machine 20 or the machine body 10, the posture of the base frame 41 changes depending on the direction in which the wall surface of the base material faces and the extending direction of the hydraulic pipe to be gripped. ..

The base frame 41 is formed in a staircase shape including a plurality of (two in this example) seat surfaces 41a and 41b (FIG. 6) composed of end surfaces having different distances from the side wall surface of the boom 21 to which the base frame 41 is attached. There is. The seat surfaces 41a and 41b are mounting surfaces of the clamps 42 and 43, and are flat surfaces parallel to or close to the side wall surface of the boom 21 to which the base frame 41 is mounted. The seat surfaces 41a and 41b are provided with two screw holes (not shown) extending in a direction orthogonal to the side wall surface of the boom 21 at the center of the base frame 41 in the plate thickness direction. These screw holes are arranged side by side in the extending direction of the hydraulic pipes 31 and 33 on the seat surfaces 41a and 41b, respectively. The corner portion 41c rising from the seat surface 41a to the seat surface 41b in the base frame 41 is formed in an R shape in order to avoid stress concentration. Further, the inclined surface 41d rising from the seat surface 41a toward the seat surface 41b is inclined in the direction from the seat surface 41a to the seat surface 41b as the distance from the side wall surface of the boom 21 increases.

In the present embodiment, the seat surface 41a having a short distance from the side wall surface of the boom 21 is referred to as the first seat surface, and the seat surface 41b having the distance from the side wall surface of the boom 21 set to be longer than the seat surface 41a is referred to as the second seat surface. To do. These seat surfaces 41a and 41b are adjacent to (misaligned) in the extending direction of the hydraulic pipes 31 and 33 gripped by the clamp device 40, but both of them are the contact surfaces between the boom 21 and the base frame 41. A base frame 41 is interposed between them. That is, the constituent members of the base frame 41 are interposed between the seat surfaces 41a and 41b and the side wall surfaces of the boom 21. Further, the distance between the seat surface 41a and the wall surface of the base material is longer than the radius of the hydraulic pipe (hydraulic pipe 31 in this example) gripped by the clamp 42, and the screwing length of the bolt which is the fixture 44 of the present embodiment is sufficient. It is set to a length that can be secured. This is to secure a clearance between the hydraulic pipe gripped by the clamp 42 and the wall surface of the base material, and to sufficiently secure the fixing strength of the clamp 42. The distance between the seat surfaces 41a and 41b is set to be longer than the total radius of the hydraulic pipes (in this example, the hydraulic pipes 31 and 33) gripped by the clamps 42 and 43. This is to secure a clearance between the hydraulic pipes gripped by the clamps 42 and 43.

The clamp device 40 is provided with one clamp 42, 43 for each of the plurality of seat surfaces 41a, 41b of the base frame 41. The clamp 42 corresponds to the seat surface 41a closer to the side wall surface of the boom 21, and is composed of two tubular pipe gripping portions 42g located on both sides of the base frame 41 and a connecting portion 42h connecting them. , The hydraulic pipe 31 is formed in an eyeglass shape (figure 8) when viewed from the extending direction. The clamp 42 is composed of two half-split members 42a and 42b bisected in a plane parallel to the seat surface 41a, and is sandwiched between these members 42a and 42b to connect the hydraulic pipe 31 to the pipe grips 42g on both sides. Grasp each one. The members 42a and 42b are configured to have the same shape, but may have different shapes. The connecting portion 42h is provided with two through holes (not shown) corresponding to the two screw holes on the seat surface 41a. The clamp 42 is fixed to the base frame 41 by fixing the connecting portion 42h to the seat surface 41a with a bolt as a fixture 44 in a state where the hydraulic pipe 31 is sandwiched between the pipe holding portions 42g on both sides.

The other clamp 43 corresponds to the seat surface 41b farther from the side wall surface of the boom 21, and like the clamp 42, the two pipe gripping portions 43g and the connecting portion 43h connecting them form a hydraulic pipe 33 (mainly). The portion 35a) is formed in a spectacle shape when viewed from the extending direction. In the present embodiment, since the hydraulic pipe 33 is thicker than the hydraulic pipe 31, the inner diameter of the pipe grip portion 43g of the clamp 43 is larger than that of the pipe grip portion 42g of the clamp 42. Further, like the clamp 42, the clamp 43 is also composed of two semi-cracked members 43a and 43b, sandwiched between these members 43a and 43b, and grips one hydraulic pipe 33 on each of the pipe grip portions 43g on both sides. The members 43a and 43b have the same shape in this example, but may have different shapes. The connecting portion 43h is provided with two through holes (not shown) corresponding to the two screw holes on the seat surface 41b. The clamp 43 is fixed to the base frame 41 by fixing the connecting portion 43h to the seat surface 41b with a bolt as a fixture 44 in a state where the hydraulic pipe 31 is sandwiched between the pipe holding portions 43g on both sides.

In the present embodiment, four bolts of the same standard having the same screwing length and diameter are used for the plurality of fixtures 44. When fixing the clamps 42 and 43 to the base frame 41, a washer 45 is interposed between the head of the fixture 44 and the clamps 42 and 43, but the washer 45 can be omitted. In this example, the clamps 42 and 43 are fixed by the fixture 44 in a state of being in contact with the seat surfaces 41a and 41b of the base frame 41 and the washer 45. With the above configuration, the clamp device 40 is formed in a T shape by the base frame 41 and the clamps 42, 43 when viewed from the extending direction of the hydraulic pipes 31 and 33. If sufficient fixing strength can be secured, not only bolts but also other fixing means such as a lever clamp may be adopted as the fixing tool 44.

With the clamp device 40 described above, the hydraulic pipes 31 and 33 extending along the back side surface of the front portion 21c of the boom 21 in the region on the back side surface side from the tip end portion of the boom cylinder 24 at least on the left side surface of the boom 21 are described above. It is gripped in a two-tiered layout. In summary, the hydraulic pipes 31 gripped by the clamp device 40 are fixed by the clamp 42 in a state where two of them are arranged side by side with the base frame 41 in the direction orthogonal to the back side surface of the front portion 21c of the boom 21. The other hydraulic pipe 33 is fixed by the clamp 43 in a state where two pipes are arranged side by side with the base frame 41 sandwiched in the direction orthogonal to the back side surface of the front portion 21c. As described above, the clamps 42 and 43 have different distances from the left side surface of the boom 21, and two rows of hydraulic pipes 31 and 33 are laid out in two stages (on two parallel planes) on the left and right, for a total of four. The hydraulic pipes 31 and 33 of the above are arranged in a three-dimensional arrangement of 2 rows and 2 columns when viewed from their extending direction.

-Effect-
(1) According to the present embodiment, the base frame 41 is sandwiched between the clamps 42 and 43 to grip the hydraulic pipes 31 and 33, respectively, and the two hydraulic pipes 31 and 33 are stacked and arranged three-dimensionally. be able to. Therefore, a plurality of hydraulic pipes 31 and 33 can be laid out densely. In addition, the clamp device 40 has a simple structure in which the base frame 41 and the clamps 42 and 43 are the main elements, and the base frame 41 is also a single plate, so that it is extremely easy to manufacture. Further, since the base frame 41 is provided with stepped mounting seats (seat surfaces 41a and 41b) corresponding to the clamps 42 and 43, the clamps 42 and 43 gripping the hydraulic pipes 31 and 33 are independently fixed to each other. Can be fixed to the seat surfaces 41a and 41b. Therefore, the piping work can be performed efficiently and easily. Further, since the seat surfaces 41a and 41b to which the clamps 42 and 43 are attached are provided on the same base frame 41, as compared with the case where the base frame is composed of a plurality of members individually provided with the seat surfaces, for example, In this embodiment, the strength of the mounting seats of the clamps 42 and 43 is high. Therefore, it is structurally unsuitable to support the hydraulic pipe 31 on the seat surface 41a which is close to the side surface of the boom 21 and to support the hydraulic pipe 33 having a larger diameter than the hydraulic pipe 31 on the far seat surface 41b. It never becomes stable. Further, the clamp 42 grips the two hydraulic pipes 31 with the base frame 41 sandwiched between them, and is supported by the base frame 41 at a position (connecting portion 42h) between the two hydraulic pipes 31. The same applies to the clamp 43. With such a configuration, a well-balanced and highly stable support structure can be obtained. Since the support structure that supports the clamps 42 and 43 that grip the hydraulic pipes 31 and 33 is only one base frame 41, the support strength of the hydraulic pipes 31 and 33 is strong, and there are few places that require welding and cracks occur. It's hard to do. In this way, it is excellent as a support structure both structurally and in terms of balance, and there is a high degree of freedom in piping layout even when flood control piping of different sizes is targeted. Further, unlike the structure in which the number of constituent members of the foundation structure that supports the clamp increases according to the number of seating surfaces, the shape of the base frame 41 is formed in a stepped shape of three or more steps, so that the hydraulic piping to be gripped is formed. It is possible to flexibly respond to an increase in the number while maintaining the above effects.

In particular, in the case of a short reach type hydraulic excavator (hereinafter, short reach) as in the present embodiment, it is significant to apply the clamp device 40. Short reach type hydraulic excavators are used for work in space where height is restricted, such as in the underground space of a building or in a tunnel. Short reach is hard by suppressing the length of the boom 21 and arm 22 and shortening the work equipment while avoiding interference with various surrounding obstacles such as tunnel walls, exposed beams and reinforcing bars of columns. It is possible to excavate the ground powerfully and dismantle buildings. Further, since the work is often performed in a narrow space where the height is restricted, the arm cylinder 25 is arranged below the work machine 20 in order to avoid interference with falling objects. In addition, although the short reach is a small model, it is often used for heavy-duty work such as rock excavation, crushing and demolition of structures, as mentioned earlier. Due to the desire to efficiently carry out high-load work, the attachment 23 may be larger than the one corresponding to the vehicle class. In order to install a large attachment 23, the hydraulic drive system (actuator, direction switching valve for operation, piping, oil filter, oil cooler, etc.) is fully functional by installing an attachment larger than the size suitable for the vehicle class. Measures are taken so that it can be demonstrated. Since some attachments 23 mounted on the short reach have a maximum drive pressure of 25 MPa or more, the hydraulic piping 33 of the attachment drive circuit has a larger diameter and a thicker wall than that of a normal small model that excavates the ground surface on the ground. The pressure resistance is high.

If the hydraulic pipes 31 and 33 of the arm cylinder drive circuit and the attachment drive circuit are passed through the region on the ventral side surface of the tip (pin 24q) of the boom cylinder 24, the hydraulic pipes 31 and 33 intersect with the boom cylinder 24. In this case, the hydraulic pipes 31 and 33 may interfere with the rod of the boom cylinder 24 due to shaking or vibration during work, and the rod of the boom cylinder 24 may be damaged. In particular, the hydraulic pipe 33 having a large diameter tends to interfere with the rod of the boom cylinder 24 for the reason described above. Therefore, when laying on the side surface of the front portion 21c of the boom 21, it is preferable to pass the hydraulic pipes 31 and 33 through the region on the back side surface side of the tip (pin 24q) of the boom cylinder 24. It is narrow to lay the hydraulic pipes 31 and 33 of the book side by side. Therefore, by using the clamp device 40 to stack the hydraulic pipes 31 and 33 in two stages in the left-right direction orthogonal to the side surface of the boom 21, avoiding interference with the boom cylinder 24, the side surface of the front portion 21c of the boom 21 is avoided. The hydraulic pipes 31 and 33 can be laid linearly and efficiently in the narrow area of the above. This is because the row width can be halved as compared with the case where a total of four hydraulic pipes 31 and 33 are arranged in one row by adopting the two-stage piping layout.

The clamp device 40 of the present embodiment, which can make the piping space compact and easy to fix, is particularly effective when a plurality of pipes are passed through such a narrow space.

(2) Since the corner portion 41c of the base frame 41 rising from the seat surface 41a toward the seat surface 41b has an R shape, for example, stress acting on the work machine 20 during work should be avoided from being concentrated on the corner portion 41c. Can be done. Further, since the corner portion 41c has an R shape and the end surface from the seat surface 41a to the seat surface 41b is formed by the inclined surface 41d, the seat surfaces 41a and 41b are formed by the radius of the R portion and the inclination of the rising portion. There is also an advantage that the interval can be secured and the fixture 44 can be easily operated. However, as long as the above-mentioned essential effect (1) is obtained, the R shape of the corner portion 41c of the base frame 41, the presence / absence of the inclined surface 41d, and the inclined direction are not always necessary and can be changed as appropriate.

(3) Assuming that the clamp 42 or the clamp 43 is fixed by interposing a member separately from the base frame 41, it is necessary to use a bolt as long as the member separately interposed between the clamp 42 or the clamp 43 as the fixture 44. .. On the other hand, in the present embodiment, since the base frame 41 has a single plate structure, both the clamps 42 and 43 can be directly fixed to the base frame 41 which is the base structure. Therefore, even if the thicknesses of the connecting portions 42h and 43h of the clamps 42 and 43 and the washer 45 are taken into consideration, the bolt as the fixture 44 does not need to be longer than necessary, and the fixture 44 for fixing the clamps 42 and 43. All bolts of the same shape can be used. As a result, the load on the fixture 44 can be reduced, and the disassembly and assembly work can be further facilitated by standardizing the parts. However, as long as the above effect (1) is obtained, it is not always necessary for all the fixtures 44 to have the same shape, and the fixtures 44 can be appropriately changed according to the required fastening strength.

(4) Assuming that the base end portion of the hydraulic hose 37 is arranged on the track circle R so as to face the back side surface of the boom 21, the work machine 20 is extended and follows the track circle R. The length of the hydraulic hose 37 can be shortened by setting the path (that is, making it a semicircular path). However, the orbital circle R is set as small as possible from the viewpoint of securing the distance from the attachment 23 as described above. Therefore, if the path of the hydraulic hose 37 is made semicircular along the track circle R, when the work machine 20 shifts to the holding posture as shown in FIG. 4, the tip portion of the hydraulic hose 37 is secured while ensuring the allowable bending radius. It is difficult to allow bending at two points, the base end and the base end. From the viewpoint of ensuring the allowable bending radius when the working machine 20 shifts to the holding posture, the hydraulic hose 37 must be longer than the arc along the track circle R with a margin. Under these circumstances, when the base end portion of the hydraulic hose 37 is arranged on the track circle R, the hydraulic hose 37 passes through the ventral side surface side of the boom 21 in a state where the working machine 20 is extended. Looseness is needed. Therefore, it is difficult to prevent the hydraulic hose 37 from exceeding the arm cylinder 25 in the extended posture of the work machine 20.

On the other hand, in the present embodiment, the base end portion of the hydraulic hose 37 is arranged closer to the tip end portion of the boom cylinder 24 (outside the raceway circle R) than the raceway circle R. In addition, the base end portion of the hydraulic hose 37 is a boom fixing pipe with an opening directed toward the bent portion 21b toward the back side surface of the front portion 21c of the boom 21 along the tangent line of the orbital circle R. It was configured to connect to 35. As a result, when the work machine 20 shifts to the holding posture as shown in FIG. 4 without loosening the hydraulic hose 37 to the ventral side surface side of the track circle R in the state where the work machine 20 is extended as shown in FIG. It is possible to secure the length of the hydraulic hose 37 sufficient to secure the allowable bending radius. Since the hydraulic hose 37 can be arranged so as not to hang down to the ground side beyond the arm cylinder 25 even if the work machine 20 is extended, the hydraulic hose 37 interferes with an obstacle below the work machine 20 in a narrow underground space. It can be difficult.

In the case of such a piping layout, the hydraulic piping 33 is boomed because there is a degree of freedom in the piping layout in the clamp device 40 when the hydraulic piping 31 and 33 are piped in two stages on the side surface of the boom 21 as described above. It is possible to pipe to the side far from the side surface of 21. By arranging the hydraulic pipe 33 of the attachment drive circuit on the side far from the side surface of the boom 21, the hydraulic pipe 31 of the arm cylinder drive circuit is passed through the side closer to the wall surface of the boom 21 and brought closer to the wall surface of the boom 21. Can be handled.

(5) As described above, the clamp device 40 allows the hydraulic pipes 31 and 33 to pass through a narrow area on the back side surface side from the tip end portion of the boom cylinder 24 on the side surface of the boom 21, so that the cab 17 can be passed through the working machine 20. The hydraulic hose 37 can be arranged on the side close to. Since the hydraulic hose 37, which may be caught in surrounding obstacles due to slack, is located on the driver's cab 17, the operator can visually check the hydraulic hose 37 during work. Therefore, it is possible to prevent the hydraulic hose 37 from interfering with surrounding obstacles. Further, since the work machine 20 is arranged side by side with the driver's cab 17 on the left and right sides of the swivel body 12 and offset, the hydraulic hose 37 is located inside the boom 21 and the arm 22 in the vehicle width direction. Therefore, it is structurally relatively difficult to interfere with surrounding obstacles.

(6) The arm cylinder 25 is arranged on the ventral side surface of the boom 21. In addition, the hydraulic pipes 31 to 33 (fixed pipes) are also laid on the rear side 21a of the boom 21 while avoiding the front portion 21c. Since the dorsal side surface of the rear portion 21a of the boom 21 is retracted to the ventral side surface side with the bent portion 21b as a boundary with respect to the dorsal side surface of the front portion 21c, the hydraulic pipes 31 to 33 can be laid through the boom 21. It can be laid out on the ventral side surface rather than the dorsal side surface of the front portion 21c. By using the clamp device 40, the hydraulic pipes 31 and 33 can be passed through the narrow area of the boom 21 described above, and thus the components of the hydraulic drive system are arranged so as to avoid the back side surface of the front portion 21c of the boom 21. can do. Therefore, it is possible to prevent the arm cylinder 25 and the hydraulic pipes 31 to 33 from interfering with obstacles above during the boom raising operation. However, as long as the above effect (1) is obtained, the layout of the hydraulic pipes 31 to 33 is not necessarily limited to such an aspect.

(7) As described above, the two arm fixing pipes 36 constituting the hydraulic pipe 33 of the attachment drive circuit pass through the back side surface of the arm 22 from the connection end with the hydraulic hose 37, and one is the attachment cylinder 26. It is routed to the right side surface of the arm 22 through between the arm 22 and the arm 22. At this time, the pin 26p that supports the base end side of the attachment cylinder 26 is located closer to the base end side of the arm 22 than the pin 22p that connects the boom 21 and the arm 22. As a result, the hydraulic pipe 33 can be laid out so as to straddle the left and right sides of the arm 22 near the rotation fulcrum (pin 22p) of the arm 22, and the connection portion of the arm fixing pipe 36 with the hydraulic hose 37 can be connected to the rotation fulcrum of the arm 22. Can be approached to. Therefore, the distance between the hydraulic hose 37 and the attachment 23 can be secured, and the hydraulic hose 37 can be made less likely to interfere with obstacles. Further, the distance between the connection end (tip) of the hydraulic hose 37 with the arm fixing pipe 36 and the rotation fulcrum of the arm 22 is suppressed, which also contributes to shortening of the hydraulic hose 37, and is the basis of the above-mentioned hydraulic hose 37. It contributes to the above effect (4) in synergy with the angle θ of the end portion.

(8) As described above, a cover for protecting the attachment cylinder 26 may be provided on the upper part of the arm 22, and in this case, the hydraulic pipe 33 (arm fixing pipe 36) of the attachment drive circuit is laid on the cover. Is also possible. However, if the cover interferes with an obstacle, there is a risk that the hydraulic pipe 33 will be deformed together with the cover. If the cover is made thicker and stronger to reduce this risk, the arm 22 will become heavier than necessary and the weight of the aircraft will increase. Affects balance. On the other hand, in the present embodiment, by laying the hydraulic pipe 33 on the back side surface of the arm 22 while avoiding the cover, it is not necessary to make the cover thicker than necessary, the weight of the arm 22 can be suppressed, and the stability of the airframe is deteriorated. Can be avoided. Further, it is conceivable to pass the hydraulic pipe 33 through the internal space of the hollow arm 22, but the pipe layout is difficult and the pipe space is narrow, so that the pipes easily rub against each other due to shaking or vibration during work. In the case of the present embodiment, since the hydraulic pipe 33 is laid on the outer wall surface of the arm 22, it is possible to avoid the difficulty of the pipe layout, the phenomenon that the pipes rub against each other is relatively unlikely to occur, and the hydraulic pipe 33 is easy to access. The maintainability is also good. However, as long as the above effect (1) is obtained, the intermediate path of the arm fixing pipe 36 of the hydraulic pipe 33 is not particularly restricted and can be appropriately changed as needed.

10 ... Main body, 18a ... Motor, 18b ... Hydraulic pump, 20 ... Working machine, 24 ... Boom cylinder (Flood actuator), 25 ... Arm cylinder (Flood actuator), 26 ... Attachment cylinder (Flood actuator), 27 ... Hydraulic actuator , 31-33 ... Hydraulic piping, 40 ... Clamping device, 41 ... Base frame, 41a ... Seat surface (first seat surface), 41b ... Seat surface (second seat surface), 41c ... Corner part (from the first seat surface) (Part that rises toward the second seating surface), 42 ... Clamp, 42a, 42b ... Two semi-cracked members, 42 g ... Pipe gripping part, 42h ... Connecting part, 43 ... Clamp, 43a, 43b ... Half-cracked Two members, 43 g ... Pipe gripping part, 43h ... Connecting part, 44 ... Fixing tool (bolt)

Claims (3)

The main body of the machine, the work machine attached to the main body of the machine, the prime mover provided in the main body of the machine, the hydraulic pump driven by the prime mover, a plurality of hydraulic actuators driven by the pressure oil discharged from the hydraulic pump, and the hydraulic pump. In a construction machine provided with a plurality of hydraulic pipes connecting to a corresponding hydraulic actuator and a plurality of clamp devices for gripping the hydraulic pipes.
At least one of the plurality of clamping devices is sandwiched between a base frame fixed in a posture extending orthogonally to the machine body main body or the machine wall surface which is the wall surface of the working machine, and two semi-cracked members. A plurality of clamps for gripping the hydraulic pipe and a plurality of fixtures for fixing the clamps to the base frame are provided.
It said base frame, said are formed in a stepped shape comprising a plurality of seating surfaces parallel to each other distance is adjacent to the extending direction of the different Do Ri the hydraulic pipes from the fuselage wall fitted with this,
The clamp is provided for each of a plurality of seating surfaces of the base frame, has pipe grips on both sides of the base frame, and is supported by a connecting portion that connects the pipe grips on both sides. A construction machine characterized in that it is configured to be fixed to a seating surface by the fixture. In the construction machine according to claim 1, the base frame has an R-shaped portion that rises from a first seating surface, which is one of the plurality of seating surfaces, toward an adjacent second seating surface. A construction machine characterized by. The construction machine according to claim 1, wherein the plurality of fixtures are a plurality of bolts having the same screwing length.

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