JP2008196245A - Arm device and working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an arm device and a working machine preventing a risk of damaging a hose due to interference with an obstacle caused by slackness of the hose for supplying an operating fluid to a working attachment provided at the tip of an extensible sliding arm. <P>SOLUTION: The working machine 11 is provided with a lower running body 12, an upper turning body 13 turnably provided on the running body 12, and a working device 14 mounted on the upper turning body 13. The working device 14 is provided with a boom 15 mounted in a vertically turnable manner to the upper turning body 13, and an arm device 16 turnably mounted on the tip of the boom 15. The arm device 16 is provided with the attachment hose 27 for supplying the operating fluid to the working attachment 24 disposed along the outer side faces of the sliding arms 25, 26, and a tension mechanism 28 for constantly applying tension to the hose 27. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an arm device having a slide arm that can expand and contract and a work machine.

  In a work machine in which a hydraulically operated attachment angle cylinder is provided on an extendable slide arm, and a bucket connected to the tip of the slide arm is rotated by the attachment angle cylinder, hydraulic oil is applied to the attachment angle cylinder. The hydraulic hose to be supplied is accommodated in the slide arm (see, for example, cited document 1).

On the other hand, as shown in FIG. 5, the working machine in which the hydraulically operated work attachment 2 is attached to the tip of the extendable slide arm 1 is shown in FIGS. 5 (a) to 5 (b). Thus, when the slide arm 1 is contracted, the hydraulic hose 3 for supplying the working oil to the work attachment 2 is loosened.
JP 11-43965 A (page 2-3, FIG. 3-4)

  For this reason, there is a problem that the slackened hydraulic hose 3 is damaged by being caught on an obstacle such as a tree.

  The present invention has been made in view of the above points, and there is a risk of damage due to interference with an obstacle of the hose caused by loosening of the hose for supplying the working fluid to the working attachment at the distal end of the extendable slide arm. It is an object of the present invention to provide an arm device and a work machine that can prevent the above.

  According to the first aspect of the present invention, a telescopic slide arm having a fluid pressure actuated working attachment at the tip, and a working fluid is provided along the outer surface of the slide arm to supply the working fluid. The arm device includes a hose and a tension mechanism that constantly applies tension to the hose.

  According to a second aspect of the present invention, the hose in the arm device according to the first aspect is arranged in a folded shape, and the tension mechanism includes a moving pulley engaged with the hose turning portion, and the moving pulley in the hose tensioning direction. And urging means for urging the power.

  According to a third aspect of the present invention, in the arm device according to the second aspect, a guide rail for guiding the movement of the movable pulley is provided.

  The invention described in claim 4 uses a spring as the biasing means in the arm device according to claim 2 or 3.

  The invention described in claim 5 includes a lower traveling body, an upper revolving body that is turnably provided on the lower traveling body, and a work device mounted on the upper revolving body. A work machine comprising: a boom attached to a swinging body so as to be rotatable in the vertical direction; and an arm device according to any one of claims 1 to 4 attached to the tip of the boom so as to be rotatable.

  According to the first aspect of the present invention, the hose for supplying the working fluid to the working attachment at the distal end of the extendable / contractible slide arm is damaged by the interference with the obstacle of the hose caused by loosening the slide arm when the slide arm is contracted. Thus, it is possible to provide an arm device that can prevent such a fear by constantly applying tension to the hose disposed along the outer surface of the slide arm by a tension mechanism.

  According to the second aspect of the present invention, the tension mechanism urges the movable pulley engaged with the hose folding portion in the hose tension direction by the urging means, so that the tension mechanism is disposed along the extendable slide arm. The tension mechanism thus made can be configured compactly.

  According to the third aspect of the present invention, since the movement of the movable pulley engaged with the hose turning portion is guided by the guide rail, the movement stability of the movable pulley can be ensured, and the operational stability of the tension mechanism can be achieved. .

  According to the invention described in claim 4, since the spring is used as the urging means, a predetermined tension can be reliably applied to the hose disposed along the extendable slide arm.

  According to the invention described in claim 5, the hose for supplying the working fluid to the working attachment at the distal end of the extendable slide arm is loosened during the contraction operation of the slide arm, and the upper swing body is swung with respect to the lower traveling body. It is possible to provide a work machine that can prevent the possibility of being damaged by being caught by an obstacle at times.

  Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS.

  As shown in FIG. 1, the work machine 11 includes a lower traveling body 12, an upper revolving body 13 that is turnably provided on the lower traveling body 12, and a work device 14 that is mounted on the upper revolving body 13. It is equipped with.

  The working device 14 includes a boom 15 attached to the upper swing body 13 so as to be rotatable in the vertical direction, and an arm device 16 attached to the tip of the boom 15 so as to be rotatable. The arm device 16 includes an arm mounting bracket 17 and the tip of the boom 15 is connected to the arm mounting bracket 17 by a shaft 18.

  The boom 15 is rotated in the vertical direction by a boom cylinder 21 provided between the upper swing body 13 and the arm device 16 is rotated by an arm cylinder 22 provided between the rear surface of the boom 15. . The rod tip of the arm cylinder 22 is connected to the arm mounting bracket 17 by a shaft 23.

  The arm device 16 includes a telescopic outer slide arm 25 and an inner slide arm 26 each having a hydraulically actuated or hydraulically actuated work attachment 24 at the tip thereof, and outer surfaces of the slide arms 25 and 26. An attachment hose 27 is disposed along the working attachment 24 and supplies working oil as working fluid to the working attachment 24, and a tension mechanism 28 that constantly applies tension to the hose 27.

  The outer and inner slide arms 25, 26 are box-shaped rectangular tube-shaped members. The base end of the slide cylinder 29 installed inside these is the outer slide arm 25, and the rod tip of the slide cylinder 29 is The inner slide arm 26 is axially coupled to each other.

  Then, the inner slide arm 26 is pushed out from the outer slide arm 25 by the extension operation of the slide cylinder 29, and the inner slide arm 26 is retracted into the outer slide arm 25 by the contraction operation of the slide cylinder 29.

  The attachment hose 27 is disposed in a folded shape, and the tension mechanism 28 includes a movable pulley 31 engaged with the hose folded portion, a guide rail 32 for guiding the movement of the movable pulley 31, and the guide rail 32. And a spring 33 as an urging means for urging the movable pulley 31 in the hose tensioning direction.

  The work attachment 24 has a mounting bracket 34, and this mounting bracket 34 is connected to the tip of the inner slide arm 26 by a shaft 35 instead of a bucket.

  A cylinder mounting bracket 36 protruding through a groove provided in the upper surface plate portion of the outer slide arm 25 is welded to the upper surface of the inner slide arm 26, and the base of the attachment angle cylinder 37 is attached to the cylinder mounting bracket 36. One end of the first and second linkages 38 and 39 is axially connected to the rod end of the attachment angle cylinder 37, and the other end of the first linkage 38 is connected to the work attachment. The other mounting bracket 34 is rotatably connected to the mounting bracket 34 by a shaft 41, and the other end of the second linkage 39 is rotatably connected to the inner slide arm 26 by a shaft 42.

  On the side surface of the boom 15, there are a plurality of pipes 43 and hoses 44, 45 for supplying and discharging hydraulic oil as a working fluid to an attachment built-in cylinder (not shown), a slide cylinder 29, and an attachment angle cylinder 37, respectively. 46 is provided.

  As shown in FIG. 2, an attachment hose 44 for supplying and discharging hydraulic oil to and from a cylinder with a built-in attachment (not shown) is connected to one end of a pipe 51 arranged along the lower portion of the outer slide arm 25. The other end of the pipe 51 is connected to one end of an attachment hose 27. The hose 27 is wound around a movable pulley 31, and the other end of the hose 27 is an upper surface on the front end side of the inner slide arm 26. The attachment side hose 53 is connected to the attachment hose 53 attached to the attachment bar 52, and the attachment side hose 53 is connected to the cylinder with a built-in attachment.

  A hose 46 for supplying and discharging hydraulic oil to and from the attachment angle cylinder 37 is connected to a hose 54 disposed in the outer and inner slide arms 25 and 26, and this hose 54 is attached to the cylinder mounting bracket 36. It is connected to an attachment angle cylinder 37 via a pipe joint 55.

  The tension mechanism 28 has one spring engaging portion 56 fixed to the side surface of the outer slide arm 25, is slidably fitted to the guide rail 32, and is attached to a slider 57 that rotatably supports the movable pulley 31. The other spring engaging portion 58 is attached, and one end and the other end of the spring 33 are engaged between the spring engaging portions 56 and 58, and the spring 33 causes the movable pulley 31 to be attached in the hose tension direction, that is, rearward. It is energized.

  As shown in FIG. 3, an attachment angle cylinder 37 welded to the upper surface of the inner slide arm 26 is provided on the upper surface plate portion 61 of the outer slide arm 25 from the opening edge of the front end to the rear. A fitting groove 62 into which the cylinder mounting bracket 36 (not shown in this figure) is fitted is formed by cutting.

  Since one hydraulic cylinder requires two hydraulic pipes, the attachment hose 27 and the tension mechanism 28 are provided symmetrically on the left and right side surfaces of the slide arm 25.

  Further, the work attachment 24 includes an electric motor (not shown) and a turning drive unit 63 incorporating a speed reduction mechanism, an opening / closing drive unit 64 that is driven to turn by the electric motor in the turning drive unit 63, and this opening / closing drive. And a pair of grapple claws 65 that are pivotally supported with respect to the portion 64 and are driven to open and close by an attachment built-in cylinder (not shown) provided in the opening / closing drive portion 64.

  The workpiece gripped by opening / closing the pair of grapple claws 65 by the opening / closing drive unit 64 can be turned to an arbitrary angle by the turning drive unit 63.

  As shown in FIG. 4, in the tension mechanism 28, one spring engaging portion 56 is fixed to a side surface of the outer slide arm 25 by a mounting plate 71, and a guide rail 32 provided integrally with the mounting plate 71. A concave slider 57 is slidably fitted to the shaft 57, and a boss 73 of the movable pulley 31 is rotatably fitted by a shaft portion 72 fixed to the slider 57. The other spring engaging portion 58 is attached, and one end and the other end of the coiled spring 33 are engaged between the spring engaging portions 56 and 58.

  The movable pulley 31 is also provided with an electric wiring pulley 75. The electric wiring pulley 75 is also provided to the electric wiring 76 that supplies electric power to the electric motor built in the turning drive unit 63 of the work attachment 24. It is used to provide a tension for preventing looseness similar to the hose 27 for attachment.

  Next, the function and effect of the above embodiment will be described.

  The boom cylinder 21 rotates the boom 15 up and down, the arm cylinder 22 rotates the arm device 16 up and down, and the slide cylinder 29 extends and retracts the inner slide arm 26 with respect to the outer slide arm 25. The attachment angle cylinder 37 variably controls the angle of the work attachment 24, the pair of grapple claws 65 are driven to open and close by the built-in attachment cylinder, and the work is rotated by the electric motor in the turning drive unit 63. To do.

  When the inner slide arm 26 is expanded and contracted with respect to the outer slide arm 25 by the slide cylinder 29, the slackness of the hose 27 for attachment changes as shown in FIG. Accordingly, the moving pulley 31 moves while the slider 57 slides along the guide rail 32, and the tension force of the spring 33 is always applied to the attachment hose 27 wound around the moving pulley 31. Thus, the hose 27 is always kept folded along the side surfaces of the slide arms 25 and 26 to prevent the hose 27 from sagging so as to hang down from the slide arms 25 and 26. This prevents the hose hanging part from being caught on a standing tree or the like.

  That is, the attachment hose 27 for supplying hydraulic oil to the work attachment 24 at the distal end of the extendable slide arm loosens when the slide arm contracts, and there is a risk of damage due to interference with the obstacle of the hose hanging part. The arm device 16 that can be prevented by constantly applying tension to the hose 27 disposed along the outer surfaces of the slide arms 25 and 26 by the tension mechanism 28 can be provided.

  Since the tension mechanism 28 urges the movable pulley 31 engaged with the hose turning portion in the hose tension direction by the spring 33, the tension mechanism 28 disposed along the extendable slide arms 25 and 26 can be made compact. Can be configured.

  Since the movement of the movable pulley 31 engaged with the hose turning portion is guided by the guide rail 32, the movement stability of the movable pulley 31 can be secured and the operational stability of the tension mechanism 28 can be achieved.

  Since the spring 33 is used as the urging means, a predetermined tension can be reliably applied to the attachment hose 27 disposed along the extendable slide arms 25 and 26.

  The attachment hose 27 for supplying hydraulic oil to the work attachment 24 at the end of the extendable slide arm is loosened when the slide arm is retracted, and obstacles such as trees stand when the upper swing body 13 turns relative to the lower traveling body 12 It is possible to provide the work machine 11 that can prevent the possibility of being damaged by being caught on an object.

  In this way, since the movable movable pulley 31 always pulls the hydraulic piping when the slide arms 25 and 26 are extended and contracted, the hydraulic piping is not loosened, and it is possible to prevent the hydraulic piping from being caught by a tree or the like. It can also be used to prevent loosening of the electrical wiring 76 to the work attachment 24 that requires electric power.

  In the illustrated embodiment, the tension mechanism 28 is a hose folding system, but may be a hose reel system (not shown), that is, a hose winding system. Further, the movement of the movable pulley 31 is not necessarily restricted by the guide rail 32. The biasing means may use gas elasticity. The work attachment 24 includes a bucket.

  The present invention can be used for the arm device 16 and the work machine 11 including the fluid pressure actuated work attachment 24 at the distal ends of the extendable slide arms 25 and 26.

It is a side view which shows one Embodiment of the working machine provided with the arm apparatus which concerns on this invention. It is a side view of an arm apparatus same as the above. It is a top view of an arm apparatus same as the above. It is sectional drawing which shows the tension mechanism of an arm apparatus same as the above. (A) is a side view which shows the expansion | extension state of the conventional arm apparatus, (b) is a side view which shows the contraction state of the arm apparatus.

Explanation of symbols

12 Undercarriage
13 Upper swing body
14 Working equipment
15 boom
16 Arm device
24 Work attachment
25, 26 Slide arm
27 hose
28 Tension mechanism
31 movable pulley
32 Guide rail
33 Spring as a biasing means

Claims (5)

A telescopic slide arm with a fluid pressure actuated work attachment at the tip;
A hose disposed along the outer surface of the slide arm for supplying a working fluid to the working attachment;
An arm device comprising: a tension mechanism that constantly applies tension to the hose. The hose is arranged in a folded shape,
The tension mechanism
A movable pulley engaged with the hose turn-up portion;
The arm device according to claim 1, further comprising: an urging unit that urges the movable pulley in a hose tension direction. The arm device according to claim 2, further comprising a guide rail for guiding the movement of the movable pulley. The arm device according to claim 2 or 3, wherein the biasing means uses a spring. A lower traveling body,
An upper swing body provided on the lower traveling body so as to be swingable; and
A working device mounted on the upper swing body,
Work equipment
A boom attached to the upper swing body so as to be vertically rotatable;
A work machine comprising: an arm device according to any one of claims 1 to 4 rotatably attached to a tip of a boom.

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