JP2023138884A - Construction machine - Google Patents

Abstract

To provide a construction machine which suppresses wear of a hydraulic hose connected to an attachment due to contact with a first link and a hose clamp.SOLUTION: A work device 8 comprises: a boom 9; an arm 11; a crusher 14 having a hydraulic cylinder 14C; a first link 16 pin-connected to the arm 11 through a link connection pin 20; a second link 17 having one end 17A pin-connected to the crusher 14 and the other end 17C pin-connected to the first link 16; and an attachment cylinder 18 having one end 18C attached on the arm 11 and the other end 18D attached on the first link 16. On an end surface 20A of the link connection pin 20, a bolt hole 21 for a clamp and a clamp attachment bolt 23 screwed in the bolt hole 21 for the clamp are provided, and on the clamp attachment bolt 23, a hose clamp 24 supporting a hydraulic hose 19C connected to the hydraulic cylinder 14C is rotatably attached.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a construction machine such as a hydraulic excavator that includes an attachment driven by a hydraulic actuator.

A hydraulic excavator, which is a typical construction machine, is composed of a self-propelled vehicle body and a working device provided on the vehicle body. The working device of a hydraulic excavator consists of a boom attached to the vehicle body, an arm attached to the tip of the boom, and an attachment attached to the tip of the arm. be exchanged. For example, when demolishing a building, an attachment such as a concrete crusher, a reinforcing bar cutter, a grapple, etc. equipped with a hydraulic actuator such as a hydraulic cylinder is attached to the tip of the arm.

The attachment is rotatably pin-coupled to the tip of the arm, and is connected to an attachment cylinder attached to the arm via a first link and a second link, and is connected to the arm according to the expansion and contraction movement of the attachment cylinder. Rotate. That is, one longitudinal end of the first link is rotatably coupled with a pin to the distal end side of the arm to which the attachment is rotatably coupled with a pin, and one longitudinal end of the second link is coupled with the attachment. are rotatably connected with a pin. The other end in the length direction of the first link and the other end in the length direction of the second link are rotatably connected with a pin, and the pin connection portion between the other end of the first link and the other end of the second link An attachment cylinder whose one end in the length direction is attached to an arm is attached to the other end of the attachment cylinder (Patent Documents 1 and 2).

The hydraulic actuator mounted on the attachment is connected to a control valve mounted on the vehicle body via a hydraulic line, and pressure oil discharged from the hydraulic pump is supplied from the control valve to the hydraulic actuator through the hydraulic line. As a result, the attachment is driven by a hydraulic actuator and performs building demolition work.

Here, the attachment performs the demolition work of the building while being rotated relative to the arm by expansion and contraction of the attachment cylinder. For this reason, the part of the hydraulic pipe connecting the control valve and the hydraulic actuator that is connected to the hydraulic actuator is constructed of a flexible hydraulic hose so that it can follow the rotational movement of the attachment. There is. In this case, a block-shaped hose joint is fixed to the tip side of the arm, located closer to the vehicle body than the pin joint of the first link, one end of the hydraulic hose is connected to the hose joint, and the other end of the hydraulic hose is connected to the hose joint. Connected to a hydraulic actuator. Therefore, it is necessary to prevent the intermediate portion of the hydraulic hose from being damaged by rubbing against the first link when the attachment is rotated, or from being damaged by contact with the building to be demolished.

On the other hand, Patent Document 1 proposes a working device in which a hose guide is rotatably attached to the outer surface of the first link and the intermediate portion of the hydraulic hose is held by the hose guide. On the other hand, in Patent Document 2, a frame-shaped hose guide (guide part) is provided on a support part attached to the outer surface of the first link, and a working device that inserts and holds an intermediate part of a hydraulic hose into this hose guide is provided. Proposed. According to these working devices, the hydraulic hose can be protected from contact with the first link or the building.

Japanese Patent Application Publication No. 2000-110198 Japanese Patent Application Publication No. 2015-40455

However, when the attachment rotates, the positional relationship between the hose joint fixed to the distal end of the arm and the first link constantly changes. On the other hand, the working devices according to Patent Documents 1 and 2 have a configuration in which the intermediate portion of the hydraulic hose is held by a hose guide attached to the first link. For this reason, when the attachment rotates, the hose guide and the hydraulic hose rub against each other, causing premature wear of the outer skin of the hydraulic hose, and the hose protector that covers the hydraulic hose from the outside gets caught on the hose guide, causing the hose protector or hose guide to become damaged. There is a problem with it being damaged.

An object of the present invention is to provide a construction machine that can prevent a hydraulic hose connected to a hydraulic actuator of an attachment from coming into contact with a first link or a hose clamp and being worn out.

The present invention includes a self-propelled vehicle body and a working device provided on the vehicle body, and the working device includes a boom rotatably attached to the vehicle body, and a boom rotatable with respect to the boom. an attachment rotatably attached to the arm and having a hydraulic actuator for driving; a first rotatably pin-coupled to the arm via a link connecting pin; a second link having one end rotatably pin-coupled to the attachment and the other end rotatably pin-coupled to the first link; one end attached to the arm and the other end rotatably pin-coupled to the first link; an attachment cylinder that is attached to a first link and rotates the attachment with respect to the arm; a bolt hole that is provided in an axial end surface of the link connecting pin and extends in the axial direction; The present invention is characterized by comprising a bolt that is screwed into the hole, and a hose clamp that is attached to the bolt so as to be rotatable about the bolt and that holds an intermediate portion of the hydraulic hose connected to the hydraulic actuator. .

According to the present invention, even if the first link rotates around the link connecting pin when the attachment rotates, the hose clamp attached to the end face of the link connecting pin is displaced following the first link. can be avoided. Thereby, the hydraulic hose can be prevented from being worn out by rubbing against the first link and the hose clamp, and the life of the hydraulic hose can be extended.

FIG. 1 is a left side view showing a hydraulic excavator according to a first embodiment of the present invention. FIG. 2 is an enlarged view of main parts showing an arm, a first link, a second link, an attachment, a hydraulic hose, etc. in FIG. 1. FIG. 3 is a cross-sectional view of the link connecting pin, first link, clamp bolt hole, clamp mounting bolt, hose clamp, hydraulic hose, etc. as viewed from the direction of arrow III-III in FIG. 2. FIG. 3 is an enlarged view of the main parts similar to FIG. 2 showing an arm, a first link, a second link, an attachment, a hydraulic hose, etc. according to a second embodiment; FIG.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a construction machine according to the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case in which it is applied to a hydraulic excavator for demolition work. In the embodiment, the traveling direction of the hydraulic excavator will be referred to as the front-rear direction, and the direction orthogonal to the traveling direction will be referred to as the left-right direction.

1 to 3 show a first embodiment of the invention. In FIG. 1, a hydraulic excavator 1 includes a self-propelled crawler-type lower body 2, an upper rotating body 3 rotatably mounted on the lower body 2, and a rotating upper body 3 provided on the front side of the upper rotating body 3. It is configured to include a working device 8, which will be described later. The lower traveling body 2 and the upper revolving body 3 constitute a vehicle body of the hydraulic excavator 1. The hydraulic excavator 1 is suitably used, for example, in demolition work of dismantling structures such as buildings.

The upper rotating body 3 includes a rotating frame 4 serving as a base, a cab 5 mounted on the left front side of the rotating frame 4, a counterweight 6 provided at the rear end of the rotating frame 4, and a counterweight 6 provided on the front side of the counterweight 6. It is configured to include an exterior cover 7. The cab 5 defines a driver's cabin in which an operator rides, and inside the cab 5 is provided a driver's seat, a travel lever/pedal, and an operating lever (none of which are shown). The counterweight 6 maintains a weight balance with a working device 8 provided on the front side of the swing frame 4. The exterior cover 7 covers mounted equipment (all not shown) mounted on the swing frame 4, such as a prime mover, a hydraulic pump, and a control valve.

The working device 8 is provided on the front side of the revolving upper structure 3 so as to be movable up and down. The work device 8 includes a crusher 14 suitable for, for example, demolition work of structures such as buildings. The working device 8 includes a boom 9, a boom cylinder 10, an arm 11, an arm cylinder 13, a crusher 14, an attachment cylinder 18, and the like, and the crusher 14 crushes reinforcing bars, concrete, etc. of a building to be demolished.

The boom 9 of the working device 8 has a base end rotatably attached to the front side of the swing frame 4 via a connecting pin (not shown). A boom cylinder 10 is provided between the boom 9 and the revolving frame 4, and the boom 9 rotates vertically (elevating and raising) relative to the revolving frame 4 (upper revolving structure 3) due to the expansion and contraction movement of the boom cylinder 10. )do.

The arm 11 is provided at the tip of the boom 9 and is rotatable with respect to the boom 9. As shown in FIG. 2, the arm 11 includes left and right side plates 11A that face each other at a constant interval in the left-right direction, a top plate 11B that connects the upper ends of the left and right side plates 11A, and a lower end of the left and right side plates 11A. It is formed as a rectangular tube having a rectangular cross-sectional shape and surrounded by an upper surface plate 11B and a lower surface plate 11C facing each other in the vertical direction.

The arm 11 is rotatably attached to the tip of the boom 9 via a connecting pin 12. An arm cylinder 13 is provided between the boom 9 and the arm 11. The arm 11 rotates about the connecting pin 12 with respect to the boom 9 due to the expansion and contraction movement of the arm cylinder 13 . Furthermore, a cylindrical link attachment boss 11E that passes through the left and right side plates 11A in the left-right direction is fixed to the tip 11D of the arm 11 (see FIG. 3). Further, the lower plate 11C of the arm 11 is provided with a cylinder bracket 11F.

The crusher 14 as an attachment is attached to the tip 11D of the arm 11. The crusher 14 includes a mounting base 14A, a pair of cutters 14B provided on the mounting base 14A so as to be openable and closable, and two hydraulic cylinders serving as hydraulic actuators provided between the pair of cutters 14B and the mounting base 14A. 14C. The crusher 14 expands and contracts two hydraulic cylinders 14C to open and close a pair of cutters 14B, thereby crushing reinforcing bars, concrete, etc. of a building to be demolished using the cutters 14B.

The mounting base 14A of the crusher 14 has an arm mounting portion 14D and a link mounting portion 14E. The arm attachment portion 14D of the attachment base 14A is rotatably attached to the tip 11D of the arm 11 via a connecting pin 15. A link attachment portion 14E of the attachment base 14A is rotatably attached to one end 17A of a second link 17, which will be described later, via a connecting pin 17B.

The left and right first links 16 are provided on the tip 11D side of the arm 11 and form a pair with the arm 11 sandwiched in the left and right direction (only the left first link 16 is shown). A longitudinally intermediate portion 16A of the first link 16 is rotatably pin-coupled to a side plate 11A of the arm 11 via a link connecting pin 20, which will be described later. One end 16B and the other end 16C in the length direction of the first link 16 are rotatable around the link connecting pin 20.

The second link 17 is provided between the first link 16 and the crusher 14. One end 17A in the length direction of the second link 17 is rotatably pin-coupled to a link attachment portion 14E of an attachment base 14A constituting the crusher 14 via a connecting pin 17B. The other longitudinal end 17C of the second link 17 is rotatably pin-coupled to one end 16B of the first link 16 via a connecting pin 17D.

The attachment cylinder 18 is provided between the other end 16C of the first link 16 and the arm 11. The attachment cylinder 18 is constituted by a hydraulic cylinder, and includes a tube 18A, a piston (not shown) slidably inserted into the tube 18A, and a base end connected to the piston and a distal end protruding outside from the tube 18A. It has a rod 18B. The bottom side of the tube 18A becomes one end 18C of the attachment cylinder 18, and the tip of the rod 18B becomes the other end 18D of the attachment cylinder 18.

One end 18C of the attachment cylinder 18 is rotatably pin-coupled to the cylinder bracket 11F of the arm 11 via a connecting pin 18E. The other end 18D of the attachment cylinder 18 is rotatably pin-coupled to the other end 16C of the first link 16 via a connecting pin 18F. Therefore, the expansion and contraction of the attachment cylinder 18 is transmitted to the crusher 14 via the first link 16 and the second link 17, and the crusher 14 rotates with respect to the arm 11 in the vertical or longitudinal direction about the connecting pin 15. move.

Two hydraulic cylinders 14C constituting the crusher 14 are connected to a control valve mounted on the upper revolving body 3 via two hydraulic pipes 19 (only one is shown). Pressure oil discharged from the hydraulic pump is supplied and discharged from a control valve (none of which is shown) to the hydraulic cylinder 14C through the hydraulic conduit 19. In this way, the two hydraulic cylinders 14C extend and contract in synchronization, thereby opening and closing the cutter 14B, and the crusher 14 can crush reinforcing bars, concrete, etc.

Here, the two hydraulic pipes 19 are provided, one each on the left and right side plates 11A of the arm 11, so the hydraulic pipes 19 provided on the left side plate 11A will be described below. As shown in FIG. 2, the hydraulic line 19 is connected between a fixed line 19A and a hose joint 19B provided on the left side plate 11A of the arm 11, and between the hose joint 19B and the crusher 14 (hydraulic cylinder 14C). The hydraulic hose 19C is provided in the hydraulic hose 19C.

The fixed conduit 19A is formed in a straight line using, for example, a metal pipe, and is fixed to the outer surface of the side plate 11A using bolts or the like. The base end of the fixed conduit 19A is connected to a control valve (none of which is shown) via a hydraulic hose or the like, and the distal end of the fixed conduit 19A is connected to a hose joint 19B. The hose joint 19B is made of a block body having a connection port for a fixed pipe line 19A and a hydraulic hose 19C, and is fixed to the side plate 11A of the arm 11 at a position close to the first link 16. The hydraulic hose 19C is formed using a flexible rubber hose, for example, and connects the hose joint 19B and the hydraulic cylinder 14C of the crusher 14. The hydraulic hose 19C supplies and discharges pressure oil to and from the hydraulic cylinder 14C while bending following the rotational movement of the crusher 14 around the connecting pin 15.

The link connecting pin 20 is attached to the link attachment boss 11E of the arm 11 and extends in the left-right direction. An axially intermediate portion of the link connecting pin 20 is inserted into the link attachment boss 11E, and both sides of the link connecting pin 20 in the axial direction protrude outside from the left and right side plates 11A of the arm 11. The longitudinal intermediate portions 16A of the left and right first links 16 are rotatably attached to link connecting pins 20 protruding from the side plate 11A of the arm 11, respectively. A clamp bolt hole 21 and a counterbore hole 22 are formed in the axial end surface 20A (only the left side is shown) of the link connecting pin 20.

The clamp bolt hole 21 is provided at the center of the end surface 20A of the link connecting pin 20 and extends in the axial direction of the link connecting pin 20. The clamp bolt hole 21 is a female threaded hole with a bottom screwed around the axis of the link connecting pin 20, and has a bottom portion 21A. A clamp mounting bolt 23, which will be described later, is screwed into the clamp bolt hole 21.

The counterbore hole 22 and the clamp bolt hole 21 are provided in the end surface 20A of the link connecting pin 20. The counterbore hole 22 is a bottomed hole recessed in the axial direction from the end surface 20A with the clamping bolt hole 21 as the center, and is arranged concentrically with the clamping bolt hole 21. The hole bottom 22A of the counterbore hole 22 constitutes a part of the end surface 20A, and the clamp bolt hole 21 opens into the hole bottom 22A of the counterbore hole 22. As a result, even if the end surface 20A of the link connecting pin 20 is hit with a hammer or the like when inserting (press-fitting) the link connecting pin 20 into the link mounting boss 11E of the arm 11, the opening side of the clamp bolt hole 21 will be It has a structure that prevents it from being damaged.

The clamp mounting bolt 23 is screwed into the clamp bolt hole 21 and attached to the end surface 20A of the link connecting pin 20. The clamp mounting bolt 23 has a shaft portion 23A formed with a male thread and a head portion 23B. The clamp mounting bolt 23 is inserted in the axial direction of the link connecting pin 20 with the male thread of the shaft portion 23A screwed into the clamp bolt hole 21, and with the tip of the shaft portion 23A in contact with the bottom portion 21A of the clamp bolt hole 21. is fixed. As a result, the clamp mounting bolt 23 is fixed to the link connecting pin 20 with the range from the axially intermediate portion of the shaft portion 23A to the head 23B protruding from the end surface 20A.

The hose clamp 24 is attached to the clamp attachment bolt 23 and holds an intermediate portion of the hydraulic hose 19C. The hose clamp 24 is formed into a P-shape by bending a rectangular metal plate, for example, and includes a hose gripping portion 24A and a mounting plate portion 24B. That is, the hose gripping part 24A is formed by curving the intermediate part in the lengthwise direction of the metal plate into an arc shape, and the mounting plate part 24B is formed by butting both ends of the metal plate in the lengthwise direction. . A fastener 24C consisting of a bolt and a nut is provided between the hose grip part 24A and the mounting plate part 24B, and by tightening the fastener 24C with the hydraulic hose 19C gripped by the hose grip part 24A. , the hydraulic hose 19C can be gripped by the hose clamp 24 with an appropriate force.

The mounting plate portion 24B of the hose clamp 24 is formed with a bolt insertion hole 24D that penetrates in the plate thickness direction. The shaft portion 23A of the clamp mounting bolt 23 is inserted into the bolt insertion hole 24D, and the clamp mounting bolt 23 is screwed into the clamp bolt hole 21 of the link connecting pin 20. Thereby, the hose clamp 24 is attached to the end surface 20A of the link connecting pin 20 so as to be rotatable about the clamp attachment bolt 23, and holds an intermediate portion of the hydraulic hose 19C.

The spacer 25 is provided between the end surface 20A of the link connecting pin 20 and the hose clamp 24. The spacer 25 is made of a cylindrical body into which the shaft portion 23A of the clamp mounting bolt 23 is inserted into the inner circumferential side, and one axial end 25A abuts the hole bottom 22A of the counterbore hole 22, and the other axial end 25B It comes into contact with the mounting plate portion 24B of the hose clamp 24. As a result, an appropriate distance is secured between the hose clamp 24 and the end surface 20A of the link connecting pin 20, and the hydraulic hose 19C held by the hose clamp 24 can be prevented from vibrating (flapping) due to pulsation of pressure oil or the like. Also, it is possible to prevent the hydraulic hose 19C from coming into contact with the first link 16 or the link connecting pin 20. Further, a small gap A is formed between the mounting plate portion 24B of the hose clamp 24 and the head 23B of the clamp mounting bolt 23. Thereby, the hose clamp 24 can smoothly rotate around the clamp mounting bolt 23.

The clamp bolt hole 21, counterbore hole 22, clamp mounting bolt 23, hose clamp 24, and spacer 25 described above are also provided on the right end surface (not shown) of the link connecting pin 20. As a result, the hydraulic hose (none of which is shown) constituting the hydraulic conduit provided on the right side plate 11A of the arm 11 is held by the hose clamp attached to the right end surface of the link connecting pin 20. There is.

The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and the hydraulic excavator 1 approaches a building (not shown) to be demolished by self-propelled by the lower traveling body 2. Then, by expanding and contracting the boom cylinder 10, arm cylinder 13, and attachment cylinder 18 of the working device 8, the crusher 14 is moved closer to the building.

In this state, pressure oil discharged from the hydraulic pump is supplied and discharged from the control valve to the hydraulic cylinder 14C of the crusher 14 through the hydraulic conduit 19. As a result, the cutter 14B of the crusher 14 opens and closes, and the building can be demolished by crushing the reinforcing bars, concrete, etc. of the building.

During dismantling work, the crusher 14 attached to the tip 11D of the arm 11 via the connecting pin 15 is moved by the connecting pin as the expansion and contraction movement of the attachment cylinder 18 is transmitted through the first link 16 and the second link 17. A rotation operation is performed around 15. At this time, the hydraulic hose 19C of the hydraulic pipe line 19 connected to the crusher 14 (hydraulic cylinder 14C) deforms following the rotational movement of the crusher 14, and supplies pressure oil to the hydraulic cylinder 14C. exclude

In the hydraulic excavator 1 according to the present embodiment, a hose clamp 24 is rotatably attached to the end surface 20A of the link connecting pin 20 around the clamp mounting bolt 23, and the intermediate portion of the hydraulic hose 19C is held by the hose clamp 24. There is. Thereby, even if the crusher 14 rotates around the connecting pin 15 during dismantling work, the hose clamp 24 will not be displaced following the rotational movement of the first link 16. As a result, the hydraulic hose 19C held by the hose clamp 24 can be prevented from coming into contact with the first link 16 and being worn out, and the life of the hydraulic hose 19C can be extended.

Further, the hose clamp 24 is attached to the end surface 20A of the link connecting pin 20 so as to be rotatable about the clamp attachment bolt 23. Therefore, even if the first link 16 rotates about the link connecting pin 20, the hose clamp 24 will not be displaced following the rotation of the first link 16. As a result, friction between the hose clamp 24 and the hydraulic hose 19C can be suppressed, and the life of the hydraulic hose 19C can be extended.

Furthermore, a spacer 25 is provided between the end surface 20A of the link connecting pin 20 and the hose clamp 24. Thereby, an appropriate distance can be secured between the hose clamp 24 and the end surface 20A of the link connecting pin 20. As a result, even if the hydraulic hose 19C held by the hose clamp 24 vibrates (flapping) due to pulsation of pressure oil, etc., the hydraulic hose 19C is ensured to contact the first link 16 and the link connecting pin 20. The life of the hydraulic hose 19C can be further extended.

Thus, the hydraulic excavator 1 according to the present embodiment includes a self-propelled vehicle body and a working device 8 provided on the vehicle body, and the working device 8 is rotatably attached to the upper revolving structure 3. A boom 9, an arm 11 rotatably attached to the boom 9, a crusher 14 having a driving hydraulic cylinder 14C and rotatably attached to the arm 11, and a link connecting pin 20. A first link 16 is rotatably pin-coupled to the arm 11 via a pin, and a first link 16 is rotatably pin-coupled to the crusher 14 at one end 17A and pin-coupled to the first link 16 at the other end 17C. 2 links 17 and an attachment cylinder 18 whose one end 18C is attached to the arm 11 and the other end 18D is attached to the first link 16 to rotate the crusher 14 with respect to the arm 11. A clamp bolt hole 21 provided in the axial end surface 20A and extending in the axial direction, a clamp mounting bolt 23 screwed into the clamp bolt hole 21, and a clamp mounting bolt 23 that is rotatable about the clamp mounting bolt 23. The hose clamp 24 is attached to the hydraulic hose 19C and holds a midway portion of the hydraulic hose 19C connected to the hydraulic cylinder 14C.

According to this configuration, even if the expansion and contraction movement of the attachment cylinder 18 is transmitted to the crusher 14 via the first link 16 and the second link 17, and the crusher 14 rotates relative to the arm 11 around the connecting pin 15, , the hose clamp 24 will not be displaced following the rotational movement of the first link 16. Thereby, the hydraulic hose 19C held by the hose clamp 24 can be prevented from contacting the first link 16 and being worn out. Further, even if the first link 16 rotates about the link connecting pin 20, the hose clamp 24 will not follow the rotation of the first link 16 and be displaced. Thereby, friction between the hose clamp 24 and the hydraulic hose 19C can be suppressed. As a result, the hydraulic hose 19C can be prevented from being worn out due to contact with the first link 16 and the hose clamp 24, and the life of the hydraulic hose 19C can be extended.

In the embodiment, a spacer 25 is provided between the axial end surface 20A of the link connecting pin 20 and the hose clamp 24 to maintain a distance therebetween. According to this configuration, even if the hydraulic hose 19C held by the hose clamp 24 vibrates (flapping) due to pulsation of pressure oil, the hydraulic hose 19C will not contact the first link 16 or the link connecting pin 20. can be reliably suppressed.

In the embodiment, the axial end surface 20A of the link connecting pin 20 is provided with a bottomed counterbore hole 22 that is recessed in the axial direction with the clamp bolt hole 21 as the center. According to this configuration, the clamp bolt hole 21 opens at the hole bottom 22A of the counterbore hole 22. Therefore, even if the end surface 20A of the link connecting pin 20 is hit with a hammer or the like when inserting the link connecting pin 20 into the link mounting boss 11E of the arm 11, the opening side of the clamp bolt hole 21 will not be damaged. It can be prevented.

In the embodiment, the clamp bolt hole 21 is formed at the axial center of the link connecting pin 20. According to this configuration, the clamp attachment bolt 23 is always attached at a constant position (center) with respect to the end surface 20A of the link connection pin 20, regardless of the attachment position of the link connection pin 20 with respect to the arm 11 (link attachment boss 11E). be able to.

Next, FIG. 4 shows a second embodiment of the present invention, and the feature of this embodiment is that the attachment cylinder is arranged on the upper plate side of the arm. Note that in this embodiment, the same components as those in the first embodiment are given the same reference numerals, and their explanations will be omitted.

Like the arm 11 according to the first embodiment, the arm 31 according to the second embodiment is rotatably attached to the tip of the boom via a connecting pin (none of which is shown). An arm cylinder (not shown) is provided between the boom and the arm 31, and the arm 31 rotates about a connecting pin with respect to the boom by the extension and contraction movement of the arm cylinder. The arm 31 is formed as a rectangular cylinder having a rectangular cross-sectional shape surrounded by left and right side plates 31A (only the left side is shown), a top plate 31B, and a bottom plate 31C.

Furthermore, a cylindrical link attachment boss (not shown) that passes through the left and right side plates 31A in the left-right direction is fixed to the tip 31D side of the arm 31, and the link connection pin 20 is inserted into this link attachment boss. has been done. However, the cylinder bracket 31E of the arm 31 is provided on the upper surface plate 31B of the arm 31, which is different from the arm 11 according to the first embodiment in which the cylinder bracket 11F is provided on the lower surface plate 11C.

One end 18C of the attachment cylinder 18 is rotatably coupled to the cylinder bracket 31E of the arm 31 via a connecting pin 18E. The other end 18D of the attachment cylinder 18 is rotatably pin-coupled to the other end 32B of the first link 32, which will be described later, together with the other end 17C of the second link 17 via a connecting pin 18F.

The left and right first links 32 are provided on the tip 31D side of the arm 31 and form a pair with the arm 31 sandwiched in the left and right direction (only the left first link 32 is shown). One end 32A in the length direction of the first link 32 is rotatably pin-coupled to the side plate 31A of the arm 31 via the link connecting pin 20. The other longitudinal end 32B of the first link 32 is rotatably pin-coupled to the other end 17C of the second link 17 and the other end 18D of the attachment cylinder 18 via a connecting pin 18F. Therefore, the expansion and contraction motion of the attachment cylinder 18 is transmitted to the crusher 14 via the first link 32 and the second link 17, and the crusher 14 rotates with respect to the arm 11 in the vertical or longitudinal direction about the connecting pin 15. move.

Also in the second embodiment, similarly to the first embodiment, a clamp mounting bolt 23 is attached to the end surface 20A of the link connecting pin 20 that rotatably attaches the first link 32 to the arm 31. A hose clamp 24 is attached. The hose clamp 24 is rotatable via the clamp attachment bolt 23 and grips an intermediate portion of the hydraulic hose 19C.

The hydraulic excavator according to the second embodiment has the above-described arm 31 and first link 32, and in the second embodiment as well, the crusher 14 is connected to the connecting pin during demolition work, as in the first embodiment. 15, the hose clamp 24 will not be displaced following the rotational movement of the first link 32. Further, even if the first link 32 rotates about the link connecting pin 20, the hose clamp 24 will not be displaced following the rotation of the first link 32. As a result, the hydraulic hose 19C held by the hose clamp 24 can be prevented from coming into contact with the first link 32 and the hose clamp 24 and being worn out, and the life of the hydraulic hose 19C can be extended.

In the embodiment, a case is illustrated in which the clamp bolt hole 21 into which the clamp mounting bolt 23 is screwed is provided at the axial center of the link connecting pin 20. However, the present invention is not limited to this, and a clamp bolt hole may be provided at a position offset from the axial center of the link connecting pin 20.

Further, in the embodiment, hose clamps 24 are attached to the left and right end surfaces 20A of the link connecting pin 20 via clamp attachment bolts 23 (only the left side is shown), and these left and right hose clamps 24 are attached to intermediate portions of the hydraulic hose 19C, respectively. This example shows the case where . However, the present invention is not limited to this, and the two hydraulic hoses 19C may be held by one hose clamp 24 attached to one end surface 20A of the link connection pin 20, for example.

Further, in the embodiment, the working device 8 having a single boom 9 and a single arm 11 (31) is illustrated, but for example, a multi-boom or a high-lift specification in which a middle arm is provided between the boom and the arm is illustrated. It can also be widely applied to other working equipment.

Furthermore, in the embodiment, the crusher 14 is illustrated as an attachment attached to the tip 11D (31D) of the arm 11 (31). However, the present invention is not limited to this, and can be widely applied to other construction machines equipped with attachments having hydraulic actuators, such as grapples and clamp arms.

2 Lower running body (vehicle body)
3 Upper rotating body (vehicle body)
8 Working equipment 9 Boom 11, 31 Arm 14 Crushing machine (attachment)
16, 32 1st link 17 2nd link 17A One end 17C Other end 18 Attachment cylinder 18C One end 18D Other end 20 Link connecting pin 20A End surface 21 Clamp bolt hole 22 Counterbore hole 23 Clamp mounting bolt 24 Hose clamp 25 Spacer

Claims (4)

Consisting of a self-propelled vehicle body and a working device installed on the vehicle body,
The working device includes a boom rotatably attached to the vehicle body;
an arm rotatably attached to the boom;
an attachment having a hydraulic actuator for driving and rotatably attached to the arm;
a first link rotatably pin-coupled to the arm via a link connection pin;
a second link having one end rotatably pin-coupled to the attachment and the other end rotatably pin-coupled to the first link;
An attachment cylinder having one end attached to the arm and the other end attached to the first link for rotating the attachment with respect to the arm,
A clamp bolt hole provided in the axial end face of the link connecting pin and extending in the axial direction, a clamp mounting bolt screwed into the clamp bolt hole, and a clamp mounting bolt that rotates around the clamp mounting bolt. 1. A construction machine comprising: a hose clamp that is movably attached and holds a midway portion of a hydraulic hose connected to the hydraulic actuator. 2. The construction machine according to claim 1, wherein a spacer is provided between the axial end surface of the link connecting pin and the hose clamp to maintain a distance therebetween. 2. The construction machine according to claim 1, wherein an axial end face of the link connecting pin is provided with a bottomed counterbore hole that is recessed in the axial direction with the clamp bolt hole as the center. The construction machine according to claim 1, wherein the clamp bolt hole is formed at the axial center of the link connecting pin.

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