JP4213576B2 - Construction equipment working equipment - Google Patents

Description

  The present invention relates to a working device for a construction machine that is provided in a construction machine such as a hydraulic excavator or a hydraulic crane and performs civil engineering work.

  2. Description of the Related Art Generally, a hydraulic excavator as a construction machine used for earth and sand excavation work or the like is roughly configured by a self-propelled vehicle body and a work device provided on the vehicle body. The working device of the hydraulic excavator is usually attached to the vehicle body so as to be able to move up and down, an arm attached to the tip side of the boom so as to be able to move up and down, and rotatably attached to the tip side of the arm. And a working tool provided.

  Here, working tools attached to the arm tip side of the working device include buckets, grapple devices, breakers, etc., and exchanging work, cargo handling by exchanging these different types of working tools and attaching them to the arm tip side. Work such as work and crushing work can be performed.

  On the other hand, in order to easily exchange these various working tools, there is known a working device in which a hydraulic attachment for attaching / detaching the working tool is attached to the distal end side of the arm. The hydraulic attachment includes two claw members that are moved toward and away from each other by an attachment cylinder. By engaging and disengaging these claw members with respect to two shafts fixed to the work tool side, A different type of work tool is quickly and easily attached to and detached from the tip side of the arm, and this hydraulic attachment constitutes a part of the work tool (see, for example, Patent Document 1).

JP-A-11-107307

  By the way, the above-described hydraulic attachment according to the prior art is rotatably attached to the distal end side of the arm, and a link mechanism is connected to the hydraulic attachment and the arm. Then, by extending and contracting a working tool cylinder provided between the arm and the link mechanism, the hydraulic attachment is configured to rotate on the distal end side of the arm together with the working tool via the link mechanism.

  Here, a hydraulic hose for supplying and discharging pressure oil from a hydraulic power source disposed in a vehicle body (upper swing body) of a hydraulic excavator is connected to an attachment cylinder provided in the hydraulic attachment. Usually extends to the hydraulic attachment along the upper surface or side surface of the arm, and the tip side is accommodated in the narrow hydraulic attachment.

  For this reason, when the hydraulic attachment rotates on the tip end side of the arm, the hydraulic hose accommodated in the hydraulic attachment is bent greatly between the arm and the hydraulic attachment and rubs against the hydraulic attachment etc. There is a problem of being damaged. Further, there is a problem that the hydraulic hose cannot follow the rotation angle of the hydraulic attachment, and the hydraulic hose is broken or bent.

  For example, when a bucket is attached to a hydraulic attachment and excavation work is performed using this bucket, the hydraulic attachment and arm are also immersed in the ground together with the bucket, and the hydraulic attachment is rotated. , The bucket will be excavated in the ground. At this time, the hydraulic hose connected to the attachment cylinder may loosen in response to the rotation of the hydraulic attachment, and may protrude greatly from the upper surface of the arm. In this case, the hydraulic hose protruded from the arm. There is a problem that the hydraulic hose is damaged by interference with obstacles around the arm.

  The present invention has been made in view of the above-described problems of the prior art, and prevents the hydraulic hose connected to the attachment cylinder of the hydraulic attachment from being damaged and can protect the hydraulic hose. An object of the present invention is to provide a working apparatus.

  In order to solve the above-described problems, the present invention provides a boom that is attached to a vehicle body of a construction machine so as to be able to move up and down, an arm that is attached to the tip side of the boom so as to be able to move up and down, and the arm as a work tool or a part thereof. A hydraulic attachment that is pivotally attached to the distal end of the actuator and is operated by an attachment cylinder, a link mechanism connected to the hydraulic attachment and the arm, and the hydraulic attachment via the link mechanism on the distal end side of the arm. The link mechanism includes a first link whose base end side is pin-coupled to the arm using a first connecting pin, and a base end side that is connected to the distal end side of the first link. A second link which is pin-coupled to the tool cylinder using a second coupling pin and whose tip side is pin-coupled to a hydraulic attachment using a third coupling pin. It is applied to the working device configured comprising construction machines.

  A feature of the configuration adopted by the invention of claim 1 is that a hydraulic line extending along the longitudinal direction of the arm and having a tip side connected to the attachment cylinder, and a hydraulic line provided rotatably on the third connecting pin And a hydraulic pipe fixing member for fixing the intermediate part of the.

  According to a second aspect of the present invention, the second link has a boss portion through which both end sides of the third connecting pin in the axial direction are inserted, and the hydraulic line fixing member is connected to the boss portion using the third connecting pin. Is configured to be separately mounted so as to be relatively rotatable.

  According to a third aspect of the present invention, the hydraulic line fixing member includes a sleeve rotatably inserted into the third connecting pin, a screw seat provided in the sleeve, and a clamp attached to the screw seat to clamp the hydraulic line. And the clamp member to be configured.

  According to a fourth aspect of the present invention, the attachment cylinder is provided with a swivel joint that rotatably connects the tip portion of the hydraulic pipe.

  According to a fifth aspect of the present invention, the attachment cylinder is provided with a block for connecting a hydraulic pipe line, and the block is rotatable about an axis parallel to the axial direction of the third connecting pin, and the tip part of the hydraulic pipe line is provided. In other words, the swivel joint to be connected is provided.

  According to the sixth aspect of the present invention, the hydraulic pipe includes a hydraulic hose extending from the middle part of the arm to the tip part along the upper surface of the arm, and the hydraulic hose is bent so as to be deformed according to the rotation of the hydraulic attachment. It is in the structure which provides a part.

  According to a seventh aspect of the present invention, the hydraulic pipe line is provided at the distal end portion of the hydraulic pipe, the hydraulic pipe extending along the arm from the base end side of the arm to the middle portion thereof, and the distal end portion being bent toward the boom. And a hydraulic hose extending along the upper surface of the arm and having a proximal end portion connected to the joint portion and a distal end portion connected to the attachment cylinder. The intermediate portion of the hydraulic hose is connected to the attachment cylinder from the joint portion. In other words, a curved bent portion that is folded back and deforms in accordance with the rotation of the hydraulic attachment is provided.

  According to the first aspect of the present invention, when the work tool cylinder expands and contracts, the expansion and contraction of the work tool cylinder is transmitted to the hydraulic attachment via the link mechanism, and the hydraulic attachment rotates on the distal end side of the arm. At this time, a midway portion of the hydraulic line connected to the attachment cylinder of the hydraulic attachment is rotatably provided on a third connecting pin that connects between the distal end side of the second link and the hydraulic attachment. It is fixed to the hydraulic line fixing member. For this reason, when the hydraulic attachment rotates on the distal end side of the arm, the hydraulic pipeline fixing member rotates with respect to the third connecting pin, so that the hydraulic pipeline fixed to the hydraulic pipeline fixing member The distance between the intermediate part and the tip part of the hydraulic pipe connected to the attachment cylinder can be kept constant. Therefore, it is possible to prevent the hydraulic pipe line from being greatly bent and rubbed against the hydraulic attachment or the like as the hydraulic attachment rotates, and to protect the hydraulic pipe line.

  According to the invention of claim 2, since the hydraulic pipe fixing member is attached to the third connecting pin inserted through the boss portion of the second link so as to be relatively rotatable separately from the boss portion. When the hydraulic attachment rotates on the distal end side of the arm, the hydraulic conduit fixing member rotates with respect to the third connecting pin, so that the hydraulic conduit is largely bent along with the rotational operation of the hydraulic attachment. And the hydraulic line can be protected.

  According to the invention of claim 3, a sleeve is rotatably inserted into the third connecting pin, and a clamp member for clamping the hydraulic pipe line is attached to a screw seat provided on the sleeve, so that an intermediate portion of the hydraulic pipe line is provided. The third connecting pin can be rotatably mounted.

  According to the invention of claim 4, since the swivel joint that rotatably connects the tip portion of the hydraulic pipe line is provided in the attachment cylinder, the swivel joint is hydraulic when the hydraulic attachment rotates on the tip side of the arm. By rotating following the hydraulic attachment, it is possible to prevent the hydraulic pipeline from being bent forcibly with the rotation of the hydraulic attachment, and to improve the durability of the hydraulic pipeline.

  According to the invention of claim 5, the attachment cylinder is provided with a block for connecting a hydraulic pipe line, and the swivel joint that is rotatable about an axis parallel to the axial direction of the third connecting pin is provided in the block. As a result, when the hydraulic attachment rotates on the distal end side of the arm, the swivel joint rotates about the axis parallel to the axial direction of the third connecting pin, so that the hydraulic conduit is bent forcibly. Can be suppressed.

  According to the invention of claim 6, the hydraulic pipe includes a hydraulic hose that extends from the middle part of the arm along the upper surface of the arm along the upper surface of the arm, and the hydraulic hose corresponds to the rotation of the hydraulic attachment. A bent portion that deforms on the upper surface of the arm is provided. As a result, even if the hydraulic hose is slackened due to the rotation of the hydraulic attachment on the distal end side of the arm, the slack of the hydraulic hose can be absorbed by deformation of the bent portion. For this reason, it is possible to prevent the slackened hydraulic hose from greatly protruding to the outside of the arm and interfering with an obstacle or the like existing around the arm, thereby protecting the hydraulic hose.

  According to the invention of claim 7, from the joint portion toward the attachment cylinder, the hydraulic hose connecting the joint portion provided at the tip portion of the hydraulic piping bent toward the boom and the attachment cylinder is connected to the attachment cylinder. A curved bent portion that is folded and deformed according to the rotation of the hydraulic attachment is provided. As a result, even if the hydraulic hose is slackened due to the rotation of the hydraulic attachment on the distal end side of the arm, the slack of the hydraulic hose can be absorbed by the bent portion being curved on the upper surface of the arm. For this reason, it is possible to suppress the slackened hydraulic hose from greatly protruding to the outside of the arm and interfering with an obstacle or the like existing around the arm.

  Hereinafter, an embodiment of a working device for a construction machine according to the present invention will be described with reference to FIGS. 1 to 11 by taking a working device for a hydraulic excavator as an example.

  In the figure, reference numeral 1 denotes a hydraulic excavator as a construction machine. A body of the hydraulic excavator 1 is a self-propelled crawler type lower traveling body 2 and an upper revolving body mounted on the lower traveling body 2 so as to be able to swivel. 3 is roughly constituted. And the earth removal board apparatus 4 is provided in the front part side of the lower traveling body 2. FIG.

  On the other hand, the upper revolving unit 3 includes a revolving frame 5 forming a support structure, a counterweight 6 provided on the rear side of the revolving frame 5 to balance the weight of a work device 11 described later, and a front side of the counterweight 6 A driver's seat 7 provided on the revolving frame 5 and a canopy 8 that covers the driver's seat 7 from above is roughly constituted. A swing post 9 that swings in the left and right directions is provided on the front side of the revolving frame 5, and a working device 11 described later is provided on the swing post 9 so as to be able to be raised and lowered.

  11 is a working device provided on the front side of the revolving frame 5 via a swing post 9 so as to be swingable in the left and right directions. The working device 11 includes a boom 12, an arm 14, and a work tool attaching / detaching device which will be described later. 16, the bucket 31 etc. are used for excavation work such as earth and sand.

  Reference numeral 12 denotes a boom attached to the swing post 9 so as to be able to move up and down. The boom 12 is formed of a rectangular tube whose middle portion in the length direction is bent in a square shape, and its proximal end is pin-coupled to the swing post 9 Has been. The boom 12 moves up and down with respect to the swing post 9 by a boom cylinder 13 provided between the boom 12 and the swing post 9.

  An arm 14 is attached to the distal end side of the boom 12 so as to be able to move up and down. The arm 14 is formed of a rectangular tube extending substantially linearly, and a base end side thereof is pin-coupled to the distal end side of the boom 12. . Here, a cylinder bracket 14A to which a work tool cylinder 30 and the like to be described later are attached is provided on the base end side of the arm 14, and a cylinder to which a work tool attaching / detaching device 16 to be described later is pin-coupled to the distal end side of the arm 14. A boss 14B having a shape and a cylindrical boss 14C to which a first link 25 described later is pin-coupled are provided apart in the longitudinal direction (see FIG. 6). The arm 14 moves up and down with respect to the boom 12 by an arm cylinder 15 provided between the arm 12 and the boom 12.

  Reference numeral 16 denotes a work tool attachment / detachment device as a hydraulic attachment constituting a part of the work tool. The work tool attachment / detachment device 16 is rotatably attached to the distal end side of the arm 14 using a connecting pin 17. Here, the work tool attaching / detaching device 16 constitutes a work tool together with a bucket 31, a grapple, a breaker, and the like (all not shown), which will be described later, and attaches and detaches these buckets 31 and the like to the distal end side of the arm 14 quickly and easily. Is. The work tool attaching / detaching device 16 includes a fixed claw member 18, a movable claw member 19, an attachment cylinder 20, and the like, which will be described later, as shown in FIGS.

  Reference numeral 18 denotes a fixed claw member serving as a base of the work tool attaching / detaching device 16. The fixed claw member 18 is formed by using, for example, a thick steel plate material, and faces the left and right sides with the front end side of the arm 14 sandwiched therebetween. The left and right side plates 18A and 18A and a connecting member (not shown) for integrally connecting the side plates 18A are provided.

  Here, a pin insertion hole 18B through which the connection pin 17 is inserted and a pin insertion hole 18C through which a later-described third connection pin 29 is inserted are provided at the base end side of each side plate 18A constituting the fixed claw member 18. Are drilled at intervals. Further, a halved pipe 18D extending in the left and right directions with a semicircular cross section is fixedly provided on the distal end side of the fixed claw member 18, and the halved pipe 18D is provided between the left and right side plates 18A. Are engaged with and disengaged from one attachment shaft 31B of a bucket 31 described later.

  The connecting pin 17 is inserted into the pin insertion hole 18B of the fixed claw member 18 and the boss portion 14B of the arm 14 with the distal end side of the arm 14 sandwiched between the left and right side plates 18A of the fixed claw member 18. Thus, the fixed claw member 18 of the work tool attaching / detaching device 16 is attached to the distal end side of the arm 14 so as to be rotatable about the connecting pin 17.

  A movable claw member 19 is provided so as to be rotatable with respect to the fixed claw member 18. The movable claw member 19 is formed by using, for example, a thick steel plate material between the side plates 18A of the fixed claw member 18. The left and right side plates 19A and 19A facing each other in the left and right directions in a sandwiched state, and a connecting member (not shown) for integrally connecting the side plates 19A are provided.

  Here, a pin insertion hole 19B is formed in the base end side of each side plate 19A constituting the movable claw member 19, and a third later-described third hole is formed in the pin insertion hole 19B and the pin insertion hole 18C of the fixed claw member 18. By inserting the connecting pin 29, the movable claw member 19 is rotatably attached to the fixed claw member 18 via the third connecting pin 29.

  Further, a half pipe 19C having a semicircular arc-shaped cross section and extending in the left and right directions is fixedly provided on the distal end side of the movable claw member 19, and the half pipe 19C is provided between the left and right side plates 19A. Are coupled to and disengaged from the other mounting shaft 31C of the bucket 31 described later.

  Reference numeral 20 denotes an attachment cylinder provided between the fixed claw member 18 and the movable claw member 19. The attachment cylinder 20 rotates the movable claw member 19 with respect to the fixed claw member 18. Here, the attachment cylinder 20 includes a tube 20A, a piston (not shown) slidably provided in the tube 20A, and a rod 20B that is fixed to the piston and has a distal end protruding from the tube 20A. ing.

  The bottom side of the tube 20 </ b> A is pivotally connected to each side plate 18 </ b> A of the fixed claw member 18 using a pin 21, and the tip side of the rod 20 </ b> B has a pin 22 on each side plate 19 </ b> A of the movable claw member 19. It is pin-coupled so that it can be rotated. Therefore, by extending and contracting the rod 20 </ b> B of the attachment cylinder 20, the movable claw member 19 rotates around the third connecting pin 29 so as to approach and separate from the fixed claw member 18. .

  Reference numeral 23 denotes a hydraulic line connecting block fixed to the tube 20 </ b> A of the attachment cylinder 20, and a passage for pressure oil supplied to and discharged from the attachment cylinder 20 is formed in the block 23. Here, the block 23 and the bottom side oil chamber of the tube 20A are connected by a hydraulic pipe 23A, and the block 23 and the rod side oil chamber of the tube 20A are connected by a hydraulic pipe 23B. As shown in FIG. 8, the block 23 is provided with two pressure oil supply / discharge ports 23C and 23C for supplying and discharging pressure oil to and from the attachment cylinder 20, and each of the pressure oil supply / discharge ports 23C is provided. Is configured such that the tip portion of the hydraulic hose 35 is connected via a swivel joint 37 described later.

  Reference numeral 24 denotes a link mechanism connected to the distal end side of the arm 14 and the work tool attaching / detaching device 16. Rotate on the side. The link mechanism 24 includes a first link 25 and a second link 27 described later.

  Reference numerals 25 and 25 denote left and right first links provided with the arm 14 sandwiched from the left and right directions, and each first link 25 is formed of a steel plate or the like bent in a heft shape. . And the base end side of the 1st link 25 is pin-coupled to the boss | hub part 14C of the arm 14 using the 1st connection pin 26 so that rotation is possible.

  Reference numeral 27 denotes a second link that constitutes the link mechanism 24 together with the first link 25, and the second link 27 is a cylindrical base end that is spaced apart in the left and right directions as shown in FIG. Between the side boss portions 27A and 27A, the cylindrical distal end side boss portions 27B and 27B, which are also arranged at intervals in the left and right directions, and between the base end side boss portions 27A and the distal end side boss portions 27B. It is comprised by the intermediate connection part 27C to connect.

  As shown in FIGS. 6 and 7, the proximal end boss portion 27 </ b> A of the second link 27 is connected to the distal end side of the first link 25 and the rod of the work tool cylinder 30 using the second connecting pin 28. Pinned to 30B. On the other hand, a third connecting pin 29 is inserted into the distal end boss portion 27 </ b> B of the second link 27, and the third connecting pin 29 is inserted into the fixed claw member 18 constituting the work tool attaching / detaching device 16. The hole 18C and the pin insertion hole 19B of the movable claw member 19 are inserted.

  Therefore, the second connecting pin 28 is pin-coupled so that the distal end side of the first link 25, the proximal end boss portion 27A of the second link 27, and the rod 30B of the work tool cylinder 30 can rotate with respect to each other. is doing. Further, the third connecting pin 29 pin-couples the tip side boss portion 27B of the second link 27 and the fixed claw member 18 and the movable claw member 19 of the work tool attaching / detaching device 16 so as to be rotatable with respect to each other. . A sleeve 39 (described later) is rotatably inserted in the middle portion of the third connecting pin 29 in the axial direction so as to be positioned between the front end side boss portions 27B of the second link 27. .

  A work tool cylinder 30 is provided between the arm 14 and the link mechanism 24. The work tool cylinder 30 includes a tube 30A whose bottom side is pin-coupled to the cylinder bracket 14A of the arm 14, and a slide inside the tube 30A. The piston (not shown) provided so that movement is possible, and the rod 30B which was fixed to this piston and the front end side protruded from the tube 30A are comprised. Here, the distal end side of the rod 30B is pin-coupled to the distal end side of the first link 25 and the proximal end boss portion 27A of the second link 27 via the second connecting pin 28 so as to be rotatable. ing.

  The work tool cylinder 30 rotates the first link 25 around the first connecting pin 26 by expanding and contracting the rod 30 </ b> B, and the second link 27 rotates the first link 25. , The work tool attaching / detaching device 16 coupled to the distal end side of the second link 27 via the third coupling pin 29 is rotated about the coupling pin 17 on the distal end side of the arm 14. is there.

  31 is a bucket for excavation work attached to the work tool attaching / detaching device 16, and the bucket 31 constitutes a work tool together with the work tool attaching / detaching device 16 attached to the distal end side of the arm 14. Further, left and right brackets 31 </ b> A that face in the left and right directions protrude from the base end side of the bucket 31, and two attachments extending in the left and right directions are provided between the left and right brackets 31 </ b> A. The shafts 31B and 31C are fixed apart from each other.

  Then, the half pipe 18D provided on the fixed claw member 18 of the work tool attaching / detaching device 16 is engaged with one attachment shaft 31B, and the half pipe 19C provided on the movable claw member 19 is engaged with the other attachment shaft 31C. By doing so, the bucket 31 can be detachably attached to the distal end side of the arm 14 via the work tool attaching / detaching device 16.

  Reference numeral 32 denotes a hydraulic line extending along the longitudinal direction of the arm 14, and the hydraulic line 32 is connected to a hydraulic source (not shown) such as a hydraulic pump mounted on the upper swing body 3 on the base end side. The side is connected to the attachment cylinder 20 of the work tool attaching / detaching device 16, and pressure oil from a hydraulic pressure source is supplied to and discharged from the attachment cylinder 20. The hydraulic pipe line 32 is configured by hydraulic pipes 33 described later, joint parts 34, and hydraulic hoses 35.

  Reference numerals 33 and 33 denote two hydraulic pipes fixedly provided on the upper surface side of the arm 14, and each of the hydraulic pipes 33 is formed by a hollow metal pipe or the like. As shown in FIGS. It extends to the middle part along the longitudinal direction. Here, the base end side of each hydraulic pipe 33 is connected to a hydraulic source mounted on the upper swing body 3 via a hydraulic hose or the like (both not shown). On the other hand, the distal end portion 33 </ b> A of each hydraulic pipe 33 is bent in the opposite direction from the work tool attaching / detaching device 16 toward the boom 12 from the intermediate portion of the arm 14.

  Reference numerals 34 and 34 denote joint portions provided at the distal end portion 33A of each hydraulic pipe 33, and each joint portion 34 connects between the hydraulic pipe 33 and a hydraulic hose 35 to be described later. Then, as shown in FIG. 3, each joint portion 34 is directed toward the boom 12 while being inclined with respect to the longitudinal direction of the arm 14 in order to form an annular bent portion 35 </ b> A (described later) in the middle portion of the hydraulic hose 35. Extending diagonally backward.

  Reference numerals 35 and 35 denote two hydraulic hoses which constitute a portion of the hydraulic pipe line 32 from the middle portion in the longitudinal direction of the arm 14 to the distal end portion. These hydraulic hoses 35 are each constituted by a flexible rubber hose or the like. The arm 14 extends in the longitudinal direction along the upper surface 14D of the arm 14. The proximal end portion of the hydraulic hose 35 is connected to a joint portion 34 provided at the distal end portion 33A of each hydraulic pipe 33, and the distal end portion of the hydraulic hose 35 is attached / detached with a work tool via a swivel joint 37 described later. It is connected to a block 23 provided in the attachment cylinder 20 of the device 16.

  Further, a midway portion of the hydraulic hose 35 is held by two hose holding members 36 and 36 provided on the upper surface 14D of the arm 14 so as to be separated in the longitudinal direction. Here, as shown in FIG. 9, the hose holding member 36 is formed as a U-shaped frame that spans the two hydraulic hoses 35 with a gap therebetween, and is fixed to the upper surface 14D of the arm 14 by means such as welding. Has been. The hose holding member 36 allows the two hydraulic hoses 35 to move in the longitudinal direction of the arm 14 and restricts the movement of the arm 14 in the width direction.

  Reference numerals 35A and 35A denote bent portions provided in the middle of each hydraulic hose 35. The bent portion 35A is a tip of a hydraulic pipe 33 bent toward the boom 12, as shown in FIGS. By being folded back toward the work tool attaching / detaching device 16 from the joint portion 34 attached to the portion 33A, the joint portion 34 and the hose holding member 36 are formed to be curved in a substantially annular shape. As shown in FIGS. 2 and 4, the bending portion 35 </ b> A of each hydraulic hose 35 is formed when the work tool attaching / detaching device 16 rotates on the distal end side of the arm 14 due to the expansion / contraction of the work tool cylinder 30. According to the slack of each hydraulic hose 35 that accompanies the rotation of the detachable device 16, it is deformed so as to expand and contract as shown in FIGS.

  That is, for example, as shown in FIG. 2, when the work tool cylinder 30 extends and the work tool attaching / detaching device 16 rotates together with the bucket 31 in the direction approaching the boom 12 (cloud direction), the slack of each hydraulic hose 35 is small. Therefore, the bent portion 35A is deformed to reduce the diameter as shown in FIG. On the other hand, for example, as shown in FIG. 4, when the work tool cylinder 30 is contracted and the work tool attaching / detaching device 16 rotates together with the bucket 31 in the direction away from the boom 12 (dump direction), the slack of each hydraulic hose 35 is large. Therefore, the bent portion 35A is deformed so as to expand in diameter as shown in FIG. When a guide plate or the like (not shown) that sandwiches the hydraulic hose 35 is provided on the left and right side surfaces of the arm 14, the bent portion 35A of the hydraulic hose 35 hits the guide plate when the diameter is increased. Thus, it is possible to suppress the bent portion 35A from protruding from the side surface of the arm 14.

  As described above, even if each hydraulic hose 35 is loosened with the rotation of the work tool attaching / detaching device 16, the slack of the hydraulic hose 35 is deformed and absorbed so that the bending portion 35A has an enlarged or reduced diameter. Thus, the hydraulic hose 35 can be prevented from protruding greatly to the side of the arm 14 and interfering with obstacles or the like existing around the arm 14.

  37 and 37 are swivel joints attached to the respective pressure oil supply / discharge ports 23C of the block 23 provided in the attachment cylinder 20, and the swivel joint 37 is connected to the tip portion of the hydraulic hose 35 with the respective pressure oil supply / discharge of the block 23. The port 23C is rotatably connected.

  Here, as shown in FIG. 8, when the axial center line of the third connecting pin 29 that connects the second link 27 and the work tool attaching / detaching device 16 is AA, each swivel joint 37 is The third connecting pin 29 is configured to rotate with respect to the block 23 about an axis BB parallel to the axis center line AA of the third connecting pin 29. Accordingly, as shown in FIGS. 6 and 7, when the work tool attaching / detaching device 16 rotates on the distal end side of the arm 14, the swivel joint 37 follows the turning operation of the work tool attaching / detaching device 16 and blocks 23. The pressure oil supply / discharge port 23 </ b> C of the block 23 and each hydraulic hose 35 are connected to each other while rotating relative to the hydraulic hose 35. Thereby, each hydraulic hose 35 is configured to be able to suppress the bending of the hydraulic hose 35 with the rotation of the work tool attaching / detaching device 16 and to increase the durability of the hydraulic hose 35.

  Reference numeral 38 denotes a hydraulic line fixing member rotatably provided on a third connecting pin 29 that connects the second link 27 constituting the link mechanism 24 and the work tool attaching / detaching device 16. The member 38 fixes an intermediate portion of each hydraulic hose 35 extending from the distal end side of the arm 14 to the attachment cylinder 20 of the work tool attaching / detaching device 16. Here, the hydraulic line fixing member 38 rotates relative to the distal end side boss portion 27B of the second link 27 separately using the third connecting pin 29, and will be described later as shown in FIG. The sleeve 39, the screw seat 40, and each hose clamp 41 are configured.

  Reference numeral 39 denotes a sleeve serving as a base of the hydraulic line fixing member 38, and the sleeve 39 is formed as a cylindrical body made of a member different from the front end side boss portions 27 </ b> B constituting the second link 27. The sleeve 39 is disposed between the front end side boss portions 27 </ b> B of the second link 27, and is rotatably inserted in an intermediate portion of the third connecting pin 29 in the axial direction. Further, on the outer peripheral surface of the sleeve 39, a screw seat 40 for screwing each hose clamp 41 to be described later is integrally provided by means of welding or the like.

  Reference numerals 41 and 41 denote hose clamps as clamp members for attaching intermediate portions of the respective hydraulic hoses 35 to the screw seats 40. The hose clamps 41 are formed by bending, for example, a rectangular thin plate material into a P-shape. . The hose clamp 41 is fastened to the screw seat 40 using the bolt 42 in a state where the midway portion of the hydraulic hose 35 is clamped.

  As described above, the intermediate portion of each hydraulic hose 35 extending from the distal end side of the arm 14 to the attachment cylinder 20 of the work tool attaching / detaching device 16 is clamped by the hose clamp 41 and is connected to the third connecting pin 29. It is fixed to the screw seat 40 of the sleeve 39 which can be rotated. Accordingly, as shown in FIGS. 6 and 7, the sleeve 39 of the hydraulic line fixing member 38 rotates with respect to the third connecting pin 29 when the work tool attaching / detaching device 16 rotates on the distal end side of the arm 14. By doing so, the distance between the middle part of each hydraulic hose 35 fixed to the hydraulic line fixing member 38 and the tip part of each hydraulic hose 35 connected to the block 23 of the attachment cylinder 20 is always kept constant. be able to. As a result, it is possible to prevent the intermediate portion of each hydraulic hose 35 from being bent greatly and rubbing against the work tool attaching / detaching device 16 or the like as the work tool attaching / detaching device 16 rotates, thereby protecting the hydraulic hose 35. It has a configuration that can.

  The working device 11 according to the present embodiment has the above-described configuration, and the operation thereof will be described below.

  First, the attachment cylinder 20 of the work tool attaching / detaching device 16 is expanded and contracted, whereby the half pipe 18D of the fixed claw member 18 is engaged with one mounting shaft 31B of the bucket 31 and the half pipe 19C of the movable claw member 19 is engaged. Is engaged with the other attachment shaft 31 </ b> C of the bucket 31. Thereby, the bucket 31 can be quickly and easily attached to the distal end side of the arm 14 via the work tool attaching / detaching device 16.

  Then, when the work tool cylinder 30 is expanded and contracted, the first link 25 of the link mechanism 24 rotates about the first connecting pin 26, and the rotation of the first link 25 causes the second link 27 to rotate. Via the work tool attaching / detaching device 16. As a result, as shown in FIGS. 2 and 4, the work tool attaching / detaching device 16 rotates around the connecting pin 17 on the distal end side of the arm 14, and the bucket 31 attached to the work tool attaching / detaching device 16 is By rotating between a cloud posture approaching 12 (the posture shown in FIG. 2) and a dump posture (the posture shown in FIG. 4) away from the boom 12, excavation work such as earth and sand can be performed by the bucket 31. .

  Here, each hydraulic hose 35 connected between the joint portion 34 of each hydraulic pipe 33 fixedly provided on the arm 14 and the block 23 of the attachment cylinder 20 provided on the work tool attaching / detaching device 16 As the tool attaching / detaching device 16 rotates on the distal end side of the arm 14, slack is generated.

  On the other hand, in the present embodiment, the third connection pin 29 that connects the distal end side of the second link 27 and the work tool attaching / detaching device 16 is rotatably inserted into the third connection pin 29. And a hydraulic line fixing member 38 comprising a hose clamp 41 attached to the screw seat 40 of the sleeve 39 in a state where the intermediate part of each hydraulic hose 35 is clamped. The middle part of each hydraulic hose 35 is fixed.

  For this reason, as shown in FIGS. 6 and 7, when the work tool attaching / detaching device 16 rotates on the distal end side of the arm 14, the sleeve 39 of the hydraulic line fixing member 38 is moved with respect to the third connecting pin 29. By rotating, the distance between the intermediate portion of each hydraulic hose 35 fixed to the hydraulic pipe line fixing member 38 and the tip portion of each hydraulic hose 35 connected to the block 23 of the attachment cylinder 20 is always substantially constant. Can be kept in. As a result, it is possible to prevent the intermediate portion of each hydraulic hose 35 from being bent greatly and rubbing against the work tool attaching / detaching device 16 or the like as the work tool attaching / detaching device 16 rotates, thereby protecting the hydraulic hose 35. be able to.

  Further, in the middle of each hydraulic hose 35 extending along the upper surface 14D of the arm 14, is located between the joint portion 34 of the hydraulic pipe 33 and the hose holding member 36 provided on the upper surface 14D of the arm 14, A bent portion 35A that is bent substantially in an annular shape is provided.

  Therefore, for example, as shown in FIG. 2, when the slack of each hydraulic hose 35 is reduced by rotating the work tool attaching / detaching device 16 together with the bucket 31 in the direction approaching the boom 12 (cloud direction), The bent portion 35A of the hydraulic hose 35 can be reduced in diameter as shown in FIG. On the other hand, for example, as shown in FIG. 4, when the slack of each hydraulic hose 35 becomes large due to the work tool attaching / detaching device 16 rotating together with the bucket 31 in the direction away from the boom 12 (dump direction), The bent portion 35A of the hose 35 can be expanded in diameter as shown in FIG.

  As described above, even if each hydraulic hose 35 is loosened due to the rotation of the work tool attaching / detaching device 16, the slack of each hydraulic hose 35 can be absorbed by the bending portion 35A having an enlarged or reduced diameter. it can. Therefore, it is possible to suppress the slackening hydraulic hoses 35 from protruding greatly to the side of the arm 14 and interfering with obstacles around the arm 14. Can be protected.

  Further, a swivel joint 37 is attached to the block 23 provided in the attachment cylinder 20 of the work tool attaching / detaching device 16, and the tip portion of each hydraulic hose 35 is rotatably connected to the block 23 via the swivel joint 37.

  Thereby, the swivel joint 37 is connected to the hydraulic oil supply / discharge port 23C of the block 23 and each hydraulic hose 35 while rotating with respect to the block 23 following the rotation operation of the work tool attaching / detaching device 16. Therefore, it can suppress that the front end side of each hydraulic hose 35 bends forcibly with the rotation operation | movement of the working tool attachment / detachment apparatus 16, and durability of this hydraulic hose 35 can be improved.

  In the above-described embodiment, the working tool attaching / detaching device 16 including the attachment cylinder 20 is described as an example of the hydraulic attachment attached to the distal end side of the arm 14. However, the present invention is not limited to this, and a grapple device 53 in which a pair of claw members 52, 52 are opened and closed by an attachment cylinder 51 as a hydraulic attachment, for example, as in a modification shown in FIG. A midway portion of the hydraulic hose 35 connected to the attachment cylinder 51 may be fixed by a hydraulic line fixing member 38 that is rotatably attached to the third connecting pin 29.

  Moreover, in embodiment mentioned above, the block 23 for piping connection is attached to the attachment cylinder 20 of the working tool attachment / detachment apparatus 16, and the case where the swivel joint 37 is attached to the pressure oil supply / discharge port 23C provided in this block 23 is illustrated. is doing. However, the present invention is not limited to this. For example, without using the block 23, the pressure oil supply / discharge port that opens to the bottom side oil chamber of the attachment cylinder 20 and the pressure oil supply / discharge port that opens to the rod side oil chamber respectively. It is good also as a structure which attaches the swivel joint 37 and connects the front-end | tip part of the hydraulic hose 35 to this swivel joint 37. FIG.

1 is a front view showing a hydraulic excavator to which an embodiment of the present invention is applied. It is a front view which shows the arm in FIG. 1, a working tool attachment or detachment apparatus, etc. with the cloud attitude | position of a bucket. FIG. 3 is a left side view of the arm, the work tool attaching / detaching device, and the like when viewed from the direction of arrows III-III in FIG. 2. It is a front view which shows an arm, a working tool attachment or detachment apparatus, etc. with the dumping attitude | position of a bucket. It is the left view which looked at the arm, the working tool attaching / detaching device, etc. from the arrow VV direction in FIG. It is sectional drawing of the principal part expansion which looked at the working tool attachment / detachment apparatus, the hydraulic pipe line fixing member, etc. from the arrow VI-VI direction in FIG. It is sectional drawing of the principal part expansion which looked at the working tool attachment / detachment apparatus, the hydraulic pipe line fixing member, etc. from the arrow VII-VII direction in FIG. FIG. 8 is a cross-sectional view of the work tool attaching / detaching device, the hydraulic pipeline fixing member, and the like when viewed from the direction of arrows VIII-VIII in FIG. 7. It is sectional drawing which looked at the arm, the hydraulic hose, and the hose holding member from the arrow IX-IX direction in FIG. It is a disassembled perspective view which decomposes | disassembles and shows a 2nd link, a hydraulic pipe line fixing member, etc. It is a front view similar to FIG. 4 which shows the state which attached the grapple device to the front end side of the arm as a modification.

Explanation of symbols

11 Working device 12 Boom 14 Arm 16 Work tool attaching / detaching device (hydraulic attachment)
20, 51 Attachment cylinder 23 Block 24 Link mechanism 25 First link 26 First connection pin 27 Second link 27B Tip side boss portion 28 Second connection pin 29 Third connection pin 30 Work tool cylinder 31 Bucket 32 Hydraulic pipe 33 Hydraulic pipe 33A Tip part 34 Joint part 35 Hydraulic hose 35A Bending part 37 Swivel joint 38 Hydraulic pipe fixing member 39 Sleeve 40 Screw seat 41 Hose clamp (clamp member)
53 Grapple device (hydraulic attachment)

Claims (7)

A boom attached to the vehicle body of a construction machine so as to be able to move up and down, an arm attached so as to be able to move up and down on the tip side of the boom, and an attachment attached to the tip side of the arm as a work tool or a part thereof. A hydraulic attachment operated by a cylinder, a link mechanism connected to the hydraulic attachment and the arm, and a work implement cylinder for rotating the hydraulic attachment on the distal end side of the arm via the link mechanism. Prepared,
The link mechanism includes a first link whose base end side is pin-coupled to the arm using a first connecting pin, and a base end side connected to the distal end side of the first link and the work tool cylinder. In the working device of the construction machine constituted by the second link which is pin-coupled using the connecting pin and the tip side is pin-connected to the hydraulic attachment using the third connecting pin,
A hydraulic line extending along the longitudinal direction of the arm and having a distal end connected to the attachment cylinder, and a hydraulic line fixing member that is rotatably provided to the third connecting pin and fixes a midway portion of the hydraulic line A construction machine working device characterized by comprising   The second link has a boss portion through which both end sides in the axial direction of the third connecting pin are inserted, and the hydraulic line fixing member is separated from the boss portion by using the third connecting pin. The construction machine working device according to claim 1, wherein the construction device is configured to be attached to be relatively rotatable.   The hydraulic line fixing member includes a sleeve rotatably inserted into the third connecting pin, a screw seat provided on the sleeve, and a clamp member attached to the screw seat and clamping the hydraulic line. The construction machine working device according to claim 1 or 2, wherein   The work device for a construction machine according to claim 1, 2 or 3, wherein the attachment cylinder is provided with a swivel joint that rotatably connects a tip portion of the hydraulic pipe line.   The attachment cylinder is provided with a block for connecting the hydraulic pipe line, and the block is a swivel that is rotatable about an axis parallel to the axial direction of the third connecting pin and connects the tip part of the hydraulic pipe line. The construction machine working device according to claim 1, 2, or 3, wherein a joint is provided.   The hydraulic pipe is formed by a hydraulic hose extending along the upper surface of the arm from the middle part of the arm to the hydraulic pipe. 6. The construction machine working device according to claim 1, 2, 3, 4 or 5, which is configured. The hydraulic pipeline includes a hydraulic pipe extending along the arm from a base end side to an intermediate part of the arm and a tip part bent toward the boom, and a joint portion provided at a tip part of the hydraulic pipe And a hydraulic hose extending along the upper surface of the arm and having a proximal end portion connected to the joint portion and a distal end portion connected to the attachment cylinder,
5. A structure in which a curved bent portion that is folded back from the joint portion toward the attachment cylinder and deforms in accordance with the rotation of the hydraulic attachment is provided at an intermediate portion of the hydraulic hose. Or the construction machine working apparatus of 5.

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