JP2014029099A - Loader work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the oscillation of hydraulic hoses along with the vertical movement of booms.SOLUTION: A loader work machine comprises: a pair of right and left side frames 2; booms B pivotally supported at their base parts on the upper parts of the pair of right and left side frames 2 via a horizontal shaft 30 and provided via boom cylinders 3 in a vertically movable manner; work tools 5 provided at the front ends of the right and left booms B via work tool cylinders 4 in a vertically turnable manner; and hose connectors 9 connected to control valves 6 which supplies pressure oil to the right and left boom cylinders 3 and the work tool cylinders 4, respectively. In one of the right and left booms B, pipes 7 are provided which are connected to the boom cylinder 3 and the work tool cylinder 4. The pipes 7 are connected to the hose connector 9 via a hydraulic hose 8. Near the horizontal shaft 30, a hose guide G is provided which has a main guide part G1 for route-guiding the middle of the hydraulic hose 8 and a retracting guide part G3 for placing and holding the hydraulic hose 8 at its connection side isolated from the hose connector 9.

Description

  The present invention relates to a loader working machine such as a front loader, a tractor / loader / backhoe (TLB), or a wheel loader.

  As disclosed in Patent Document 1, a loader working machine such as a front loader includes a pair of left and right side frames, a boom provided to the left and right side frames via a boom cylinder, and a tip of the left and right booms. And a control valve for supplying pressure oil to the left and right boom cylinders and the work tool cylinder, and a hose connector connected to the control valve. The piping and the hose connector are connected by a hydraulic hose.

  The hose connector is arranged on the left and right inner surfaces of the side frame that supports one boom, the piping is fixed to the left and right inner surfaces of the boom, and the hydraulic hose is bent downwardly from the control valve and connected to the piping. ing.

JP 2001-140276 A

Since the hydraulic hose is slacked downward from the hose connector to the pipe, the hydraulic hose does not hinder the front view, but it can swing greatly up and down or left and right as the boom moves up and down. is there. Further, when the hydraulic hose is detached from the hose connector, the base end side of the hydraulic hose may sag and oil dripping may occur.
It is an object of the present invention to provide a loader working machine that can solve such problems of the prior art.

  It is an object of the present invention to provide a loader working machine that guides the route of the middle part of a hydraulic hose and that can keep the base end side of the hydraulic hose placed and held when the hydraulic hose is detached from the hose connector. To do.

Specific means for solving the problems in the present invention are as follows.
First, a pair of left and right side frames 2, a boom B in which a base is pivotally supported on the upper part of each of the left and right side frames 2 via a horizontal shaft 30 and can be raised and lowered via a boom cylinder 3, and left and right booms A work tool 5 provided at the tip of B via a work tool cylinder 4 so as to be rotatable up and down, and a hose connector 9 connected to the left and right boom cylinders 3 and a control valve 6 for supplying pressure oil to the work tool cylinder 4. A loader working machine in which a pipe 7 connected to the boom cylinder 3 and the work tool cylinder 4 is provided on the left and right boom B, and the pipe 7 and the hose connector 9 are connected by a hydraulic hose 8,
A hose having a main guide part G1 for guiding the route of the middle part of the hydraulic hose 8 and a retracting guide part G3 for placing and holding the connection side of the hydraulic hose 8 separated from the hose connector 9 in the vicinity of the horizontal shaft 30. A guide G is provided.

Secondly, the hose guide G is characterized in that a main guide part G1 and a retraction guide part G3 are integrally formed.
Thirdly, the hose guide G has a retraction guide part G3 above the main guide part G1, and a sub-guide part G2 that provides route guidance on the connection side of the hydraulic hose 8 with the pipe 7 on the front side of the main guide part G1. It is characterized by having.

Fourth, the hydraulic hose 8 is inserted into the main guide portion G1 from the upper side to the lower side after forming an upward slack T from the connection end with the hose connector 9, and the curved portion W is below the main guide portion G1. After being formed, the auxiliary guide part G2 is inserted from the lower side to the upper side to reach the pipe 7.
Fifth, the hose connector 9 is arranged on the side surface of the side frame 2 that supports one boom B, and the hose guide G is fixed to the side surface of the one boom B, and the mounting material. 11 and a bar 12 projecting from the side of the boom B to the front of the hose connector 9.

  Sixth, the hose guide G connects both ends of a loop-shaped bar 12 to a mounting member 11 fixed to one boom B, and the bar 12 protrudes from the mounting member 11 to the side and retracts. A guide part G3 is formed, a main guide part G1 protruding downward from the end of the retraction guide part G3 and bulging in a direction away from the boom B at the lower part is formed, and forward from the front part of the main guide part G1 It protrudes to form a sub-guide part G2, extends upward from the sub-guide part G2, and bends toward the boom B to reach the attachment material 11.

Seventh, the retraction guide part G3 of the hose guide G is located above the hose connector 9 and in front of and below the main guide part G1.
Eighth, the hose guide G is formed by a single bar 12, and the rear end of the bar 12 is fixed to the upper side of one side frame 2, forward from the rear end and from the side frame 2. A main guide portion G1 bulging in a direction away from the main guide portion G1 is formed, and a retracting guide portion G3 having a substantially L shape in front view projects downward from the front portion of the main guide portion G1.

According to the present invention, it is possible to route the middle part of the hydraulic hose and to place and hold the proximal end side of the hydraulic hose when the hydraulic hose is detached from the hose connector.
That is, in the invention according to claim 1, in the vicinity of the horizontal shaft 30, the main guide portion G1 for route guiding the middle portion of the hydraulic hose 8 and the connection side of the hydraulic hose 8 separated from the hose connector 9 are placed and held. Since the hose guide G formed with the retraction guide part G3 to be provided is provided, the middle part of the hydraulic hose 8 can be curved to guide the route, and the swinging of the hydraulic hose 8 accompanying the raising and lowering of the boom B is reduced. When the hydraulic hose 8 is detached from the hose connector 9, the proximal end side of the hydraulic hose 8 can be retracted and stored in the retraction guide part G3, and the hydraulic hose can be prevented from drooping and dripping. it can.

In the invention according to claim 2, since the hose guide G integrally forms the main guide portion G1 and the retraction guide portion G3, it can be manufactured at low cost.
In the invention according to claim 3, the hose guide G has a retraction guide part G3 above the main guide part G1, and a sub-guide for route guidance of the connection side with the pipe 7 of the hydraulic hose 8 on the front side of the main guide part G1. Since the guide part G2 is provided, not only the route of the middle part of the hydraulic hose 8 can be routed, but also the pipe connection side of the hydraulic hose 8 can be routed and the hydraulic hose 8 can be moved up and down as the boom B moves up and down. It can be followed appropriately and easily.

In the invention according to claim 4, the hydraulic hose 8 is inserted into the main guide portion G1 from the upper side to the lower side after forming an upward slack T from the connection end with the hose connector 9, and below the main guide portion G1. After forming the curved portion W, the hydraulic hose 8 can be guided at an optimal position in front of the hose connector 9 because the sub guide portion G2 is inserted from the lower side to the upper side to reach the pipe 7.
The invention which concerns on Claim 5 arrange | positions the hose connector 9 in the side surface of the side frame 2 which supports one boom B, The attachment material 11 fixed to the side surface of one boom B, and the hose guide G, Since it is formed with the bar 12 connected to the mounting member 11 and projecting from the side surface of the boom B to the front of the hose connector 9, it can be easily mounted and manufactured at low cost.

  In the invention according to claim 6, the hose guide G has both ends of the loop-shaped bar 12 connected to the mounting material 11 fixed to one boom B, and the bar 12 is laterally moved from the mounting material 11. A retraction guide part G3 is projected to form a main guide part G1 projecting downward from the end of the retraction guide part G3 and bulging in a direction away from the boom B at the lower part, and the front part of the main guide part G1 Projecting forward to form a sub-guide portion G2, extending upward from the sub-guide portion G2 and bent toward the boom B to reach the mounting material 11, so that it can be manufactured at low cost and the hydraulic hose 8 can be And route guidance in the front-rear direction.

In the invention according to claim 7, since the retraction guide part G3 of the hose guide G is located above the hose connector 9 and in front of and below the main guide part G1, the optimum position above the hose connector 9 The route of the hydraulic hose 8 can be routed.
In the invention according to claim 8, the hose guide G is formed by one bar 12, the rear end of the bar 12 is fixed to the upper part of the side surface of one side frame 2, the front end from the rear end and the side The main guide part G1 bulging in a direction away from the frame 2 is formed, and the retracting guide part G3 having a substantially L-shape in front view projects downward from the front part of the main guide part G1, so that it can be manufactured at low cost, and It is possible to route the hydraulic hose 8 through the outside of the horizontal shaft 30.

It is a perspective view of the principal part of the use condition which shows 1st Embodiment of this invention. It is the side view which retracted and stored the hydraulic hose. It is the perspective view which retracted and stored the hydraulic hose. It is the top view which retracted and stored the hydraulic hose. It is a perspective view of the principal part which retracted and stored the hydraulic hose. It is the perspective view which looked at the hose guide from the front upper direction. It is the perspective view which looked at the hose guide from the back side. It is a front view of a hose guide. It is a top view of a hose guide. It is a whole side view of a loader work machine. It is a perspective view of the principal part of the loader work machine which shows 2nd Embodiment of this invention. It is a whole side view of the loader work machine. It is a perspective view of the hose guide. It is a rear view which shows a working tool mounting apparatus. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 10, the loader working machine 1 </ b> A is illustrated as a front loader attached to the traveling vehicle body 20. A tractor as a traveling vehicle body 20 has a transmission case 22 connected to the rear portion of the engine 21, a front frame 23 protrudes forward from the engine 21, a front wheel 24 is suspended on the front frame 23, and a bonnet 25 covering the engine 21 is mounted. A mounting frame 27 for mounting a front loader is attached to the left and right sides of the engine 21 and the transmission case 22.

The mounting frame 27 has a cylindrical mounting cylinder 27B fixed to the left and right outwards from a mounting plate 27A bolted to the left and right side surfaces of the traveling vehicle body 20, and a support plate 27C is erected from the outer end of the mounting cylinder 27B. The receiving plate 27C is provided with a receiving recess 28a and a mounting pin hole 28b.
The front loader 1 is pivotally supported by a left and right side frame 2, a boom B whose base is pivotally supported on the left and right side frames 2 via a horizontal shaft 30, and a pivot 31 on a distal end of the left and right boom B. The working tool mounting body 40, the working tool (bucket) 5 mounted on the working tool mounting body 40, and the boom cylinder 3 connected between the front and rear halfway parts of the left and right booms B and the lower part of the side frame 2. And a work tool cylinder (bucket cylinder) 4 for rotating the work tool up and down provided between the front and rear halfway parts of the left and right booms B and the work tool mounting body 40.

Each of the left and right side frames 2 has a pin-like engaging portion 32 provided at the lower end engaged with a receiving recess 28a provided in the upper and lower middle portion of the receiving plate 27C, and a receiving pin hole and a receiving pin hole provided in the upper and lower middle portion. By inserting the mounting pin 33 into the mounting pin hole 28b provided in the upper part of the plate 27C, the mounting frame 27 is detachably mounted.
In the loader working machine 1A according to the first embodiment shown in FIGS. 1 to 10, the boom B is shaped like a side view, and a pair of left and right is connected by an intermediate connecting member 35. The lower part of the work tool mounting body 40 is pivotally supported via the, and the middle part of the work tool mounting body 40 is connected to the tip of the cylinder rod of the work tool cylinder 4 via the support shaft 34.

The work tool 5 is detachably mounted on the work tool mounting body 40, and the work tool mounting apparatus S is configured by these.
Each of the left and right work tool cylinders 4 is disposed opposite to the front upper side of each of the left and right booms B, and the work tool mounting body 40 can be rotated around the pivot 31 by the expansion and contraction operation to rotate the work tool 5 up and down. The work tool 5 can be scooped by contracting, and the work tool 5 can be dumped by stretching.

  1 to 5 and 10, a pipe 7 formed of four metal pipes is arranged inside one of the left and right booms B (right boom B in the embodiment). The pipes 7 are two for the left and right boom cylinders 3 and two for the left and right work tool cylinders 4, and the pipes 7 branched from the right boom B are arranged along the intermediate connecting member 35. The tip of each pipe 7 is connected to each cylinder via a hydraulic hose.

The base end side of the four metal pipes 7 protrudes from the lower surface of the base portion of the right boom B, and the four end portions are arranged back and forth along the boom B. The left and right boom cylinders 3 and the work implement cylinder A hydraulic control hose 8 is connected to a control valve 6 that supplies pressure oil to 4 and a hose connector 9 that is connected to the control valve 6.
The hose connector 9 is integrally attached to the control valve 6, and the control valve 6 and the hose connector 9 are attached to a stay 36 protruding upward from the back surface of the support plate 27 </ b> C and approaching the traveling vehicle body 20. The connecting portion with the hydraulic hose 8 is located on the inner side surface of the right side frame 2 (the left side surface facing the traveling vehicle body 20) and overlaps with the right side frame 2 in the front-rear direction. The lever 6A protrudes upward behind the right side frame 2 and can be operated from the traveling vehicle body 20.

When the front loader 1 is detached from the mounting frame 27, the control valve 6 and the hose connector 9 remain on the mounting frame 27 side, and the hydraulic hose 8 is left on the front loader 1 side.
1 to 9, a hose guide G for route guiding the hydraulic hose 8 is provided in the vicinity of the horizontal shaft 30 on the inner side surface of the base portion of the boom B on the one side (right side).
The hose guide G is formed by an attachment material 11 made of a strip and a rod 12 having both ends connected to both longitudinal ends of the back surface of the attachment material 11, and the attachment material 11 is formed on the inner surface of the boom B. It is fixed via a fixture such as a bolt.

The bar 12 has a loop shape by fixing both ends of one bar to the mounting member 11 and projects from the inner surface of the boom B to the front of the hose connector 9.
This bar 12 is bent left and right, up and down, and back and forth, and the main guide portion G1 that guides the route of the connection side of the hydraulic hose 8 to the hose connector 9 and the route side of the connection side of the piping 7 of the hydraulic hose 8 are route-guided. And a retraction guide portion G3 for placing and holding the proximal end side of the hydraulic hose 8 separated from the hose connector 9 above the main guide portion G1.

  That is, as shown in FIGS. 6 to 9, the bar 12 extends horizontally from the rear end fixed to the mounting member 11 to become a horizontal portion 12a, and extends upward from the end of the horizontal portion 12a to become a rising portion 12b. The horizontal portion 12a and the rising portion 12b form a retraction guide portion G3, and the base end side of the detached hydraulic hose 8 is placed on the horizontal portion 12a and sandwiched between the rising portion 12b and the boom B. It is held so as not to be displaced from the horizontal portion 12a.

  After tilting downward from the upper end of the rising portion 12b to the lower inner side, the lower inner side is inclined to form a front mountain-shaped front partitioning portion 12c, extending from the lower end of the front partitioning portion 12c to the outer side and bent downward. It becomes a partition portion 12d, and bulges outward and laterally from the lower end of the rear partition portion 12d to form a substantially C-shaped arc portion 12e in plan view. The front partition portion 12c, the rear partition portion 12d, and the arc portion 12e The front guide part 12c and the rear partition part 12d restrict the movement of the connection side of the hydraulic hose 8 to the hose connector 9 forward and backward when the boom B is raised and lowered. The movement away from the direction is restricted by the arc portion 12e, and the route guide is performed by restricting the connection side of the hydraulic hose 8 to the hose connector 9 from moving back and forth and to the left.

  From the front end of the arc portion 12e, it extends linearly in the forward direction to form a left and right partition portion 12f. The left and right partition portions 12f extend upward from the front end and bend and are fixed to the front portion of the mounting material 11 toward the boom B. Thus, the connecting portion 12g is formed, and the front portion of the arc portion 12e, the left and right partitioning portions 12f, and the connecting portion 12g form a sub-guide portion G2, and the connection side of the hydraulic hose 8 to the pipe 7 is the lifting and lowering of the boom B. Occasionally it moves backward and approaches the connection side of the hydraulic hose 8 to the hose connector 9, and the upward movement is restricted at the front part of the arc part 12 e and moved in the direction approaching the boom B. The route guidance is performed by restricting the left and right partition portions 12f so that the connection side of the hydraulic hose 8 with the pipe 7 does not move rearward and rightward.

  In use, the hydraulic hose 8 extends from the base end connected to the hose connector 9 to the front and upper side as shown by a solid line in FIG. 1 and a two-dot chain line in FIG. A U-shaped upward slack T is formed, and after the slack T is formed, the main guide portion G1 is inserted from the upper side to the lower side, and the U-shaped curved portion W is formed below the main guide portion G1, and then the auxiliary guide is formed. The part G2 passes through from the lower side to the upper side, the movement restriction in the left and right direction is performed by the arc part 12e and the left and right partition part 12f, and the movement restriction in the front and rear direction is performed by the arc part 12e and the rear partition part 12d. When the connecting side of the hydraulic hose 8 to the pipe 7 moves up and down due to the up and down movement, the U-shaped slack T of the base end part expands and contracts to follow the movement of the boom B, and the front partition part 12 c is in front of the slack T. Regulate bulging.

The main guide portion G1 and the sub-guide portion G2 of the hose guide G are positioned in front of the hose connector 9, so that the hydraulic hose 8 can be guided as much as possible in the left-right direction, and the retraction guide portion G3 is provided with the hydraulic hose 8 The base end connector can be held as close to the side surface of the boom B as possible.
In the loader work machine 1A, the control valve 6 and the hose connector 9 are arranged on the outer surface side of the right side frame 2, and the hose guide G is placed on the outer surface of the right boom B or the outer surface of the side frame 2 on the horizontal axis. You may provide in the vicinity of 30.

Further, the hose guide G forms a vertical portion downward from the upper end of the rising portion 12b of the bar 12, and connects the rear end of the left and right partitioning portions 12f to the lower end of the vertical portion by extending backward. Another member having a C shape in a plan view may be fixed to the rearward extension portion of the partition portion 12f, and the main guide portion G1 may be formed by the circled portion.
FIGS. 11-13 has shown 2nd Embodiment of the loader work machine.

In the loader work machine 1B, the control valve 6 and the hose connector 9 are configured separately, and the control valve 6 is provided in the traveling vehicle body 20, and the hose connector 9 is located outside the side surface of the support plate 27C of the mounting frame 27. The control valve 6 and the hose connector 9 are connected to each other by a hose 9A.
A pipe 7 formed of four metal pipes is disposed on the outer side of one of the left and right booms B (the right boom B in the embodiment). The pipes 7 are two for the left and right boom cylinders 3 and two for the left and right work tool cylinders 4, and are used for lock cylinders that hydraulically drive the lock / release of the work tool mounting body 40, or instead of buckets. Piping for a cylinder for driving a thumb mounted on the machine or a service port for driving other working tools may be provided.

The four pipes 7 are branched from the right boom B and disposed along the intermediate connecting member 35, and the ends of the pipes 7 are connected to the cylinders via hydraulic hoses.
The base end side of the metal pipe 7 protrudes outward from the lower surface of the base portion of the right boom B, and four end portions are arranged back and forth along the boom B. The left and right boom cylinders 3 and the work implement cylinder A hydraulic hose 8 is connected to a hose connector 9 connected to a control valve 6 that supplies pressure oil to 4.

The connecting portion between the hose connector 9 and the hydraulic hose 8 is located on the outer side surface of the right side frame 2 (the right side surface opposite to the side facing the traveling vehicle body 20) and overlaps the right side frame 2 in the front-rear direction. ing.
When the front loader 1 is detached from the mounting frame 27, the hose connector 9 remains on the mounting frame 27 side, and the hydraulic hose 8 is left on the front loader 1 side.

A hose guide G that guides the route of the hydraulic hose 8 is provided in the vicinity of the horizontal shaft 30 on the outer surface of the upper portion of the right side frame 2.
The hose guide G is formed of only one bar 12, the rear end is directly fixed to the upper part of the outer side surface of the side frame 2, and the main guide part G <b> 1 guides the route of the middle part of the hydraulic hose 8. And a retraction guide part G3 for placing and holding the connection side of the hydraulic hose 8 detached from the hose connector 9.

That is, the rear end of the bar 12 is fixed to the upper part of the side surface of one side frame 2, and the main guide portion G1 bulging in a substantially U-shape in plan view in a direction away from the rear frame forward and from the rear end. It is formed, bent downward after passing through a straight line portion from the front portion of the main guide portion G1, and protrudes a retraction guide portion G3 having a substantially L shape in front view.
The retraction guide part G3 is located above the hose connector 9 and in front of and below the main guide part G1, and an upward rising part G3a for preventing the hose from falling off is formed on the tip side.

The hydraulic hose 8 in use, as shown by a solid line in FIG. 11, extends from the base end connected to the hose connector 9 to the front upper side and bends rearward to the main guide part G1 from the lower side to the upper side. A U-shaped rearward upward slack T passing through the outer side of the horizontal shaft 30 is formed, and a mountain-shaped curved portion W is formed in front of the main guide portion G1, and then the upper side of the pipe 7 is formed. Connected from.
When the front loader 1 is detached from the mounting frame 27, as shown in FIG. 12, the base portion side of the hydraulic hose 8 is detached from the hose connector 9, and the base portion is placed on the retraction guide portion G3. The hydraulic hose 8 forms a curved portion W rearward and upward from the pipe 7, the U-shaped midway portion is inserted through the main guide portion G1 from the top to the bottom, and route guidance is performed, and the base portion beyond that is guided to the retraction guide portion G3. Placed. The base side of the hydraulic hose 8 is prevented from falling off the retraction guide part G3 by the upward rising portion G3a at the tip of the retraction guide part G3.

The hydraulic hose 8 at the time of detachment is supported by the rear part of the main guide part G1 in the middle part of the U-shape and the base part on the connection side is supported by the retraction guide part G3, so that the tip of the base part on the connection side is held forward and upward. It is also possible to prevent oil dripping.
In the loader work machine 1B, the control valve 6 and the hose connector 9 are arranged on the inner surface side of the right side frame 2, and the hose guide G is placed on the inner surface of the right boom B or the inner surface of the side frame 2 on the horizontal axis. You may provide in the vicinity of 30.

  FIGS. 14 and 15 show an example of a work tool mounting apparatus S in which the work tool 5 is mounted on the work tool mounting body 40. Note that the top, bottom, front and back are based on the state where the bottom wall 5a of the bucket in FIG. 12 is grounded, and the cylinder rod of the work tool cylinder 4 may be directly connected to the work tool mounting body 40. The push-pull link 4a and the posture control link are connected to the tip of the rod, the push-pull link 4a is connected to the work implement mounting body 40, and the posture control link is connected to the vicinity of the tip of the boom B. ing.

The working tool 5 is exemplified as a bucket, and the bucket has a bottom wall 5a, a back wall 5b, and side walls 5c at both right and left ends thereof, and an upper plate 45 extending over the entire width is provided at the upper portion. A pad 46 and a guide plate 47 are provided on the left and right sides of the back surface of 5b, and a lower plate 48 is provided from the bottom wall 5a to the lower part of the pad 46 on the back wall 5b.
The work tool 5 has an engaged portion 41 on the back surface. The engaged portion 41 is formed by forming an upper engaged portion 41U on the left and right side portions when the upper plate 45 protrudes rearward from the upper portion of the abutting plate 46, and lowering the lower portion of the engaging plate 46 rearwardly. An engaged portion 41D is formed.

The left and right guide plates 47 are disposed on the left and right outer sides of the left and right abutting plates 46, and the rear portion is inclined so as to widen backward, so that the left and right positions of the work implement mounting body 40 approaching the guide plate 47 from behind are guided. .
The work tool mounting body 40 is provided on the back surface of the attachment body 43, the attachment body 43 having an engagement portion 42 that is in contact with the back surface of the work tool 5 and engages the engaged portion 41. A pair of left and right connecting portions 50 that support the pivot 31 and a pair of left and right locking means 51 that are supported by the attachment body 43 and lock and release the engagement between the engaging portion 42 and the engaged portion 41 are provided. doing.

The attachment body 43 is formed by a pair of left and right attachment plates 43A formed in a lateral width facing the left and right contact plates 46, and a pipe connection member 43B that connects the left and right attachment plates 43A.
The attachment plate 43A has an upper engagement portion 42U that is bent into a dogleg shape at the upper part and enters the lower surface side of the upper engaged portion 41U, and a lower portion that is bent into a dogleg shape. A lower engaging portion 42D is formed on the upper surface side of the lower engaged portion 41D to be engaged therewith, and the lower engaged portion 41D and the lower engaged portion 42D are aligned with each other in a superposed state. Holes 49a and 49b are formed.

  Each of the pair of left and right attachment plates 43A is provided with brackets 44A on both the left and right sides to form a connecting portion 44. Boss portions that support both ends of the pivot 31 are formed in the lower portion of the left and right brackets 44A, the tip of the boom B is disposed between the left and right boss portions, and both ends of the support shaft 34 are supported in the middle in the vertical direction. A boss portion is formed, and a push-pull link 4a of the work tool cylinder 4 is disposed between the left and right boss portions.

  Each of the left and right lock means 51 is located between the left and right brackets 44A, and a lock pin 52 is supported by a cylindrical guide 49 fixed to the back surface of the attachment plate 43A so as to be movable up and down. The lower part of the link 53 is connected to the upper part of the link 53, the sliding member 56 and the spring 55 are provided on the upper part of the link 53, and the lock lever 54 is connected to the pin part of the sliding member 56.

The lock lever 54 can be manually operated, and is pivotally supported by a support pin 43C fixed to the attachment plate 43A. The left and right lock levers 54 can be swung simultaneously by one operator with both left and right hands. Is arranged.
A hydraulic cylinder 58 is provided between the lower end portions of the left and right lock levers 54, and the lock lever 54 is rocked and unlocked by expansion and contraction of the hydraulic cylinder 58.

The hydraulic cylinder 58 can be operated by a hose connector 9 via a pipe and a hose similarly to the work tool cylinder 4 and the like, and the pipe is disposed in the right boom B, and the hydraulic hose 60 is provided from the tip thereof. Pressure oil is supplied through
Two hydraulic hoses 60, which are connected to the bottom side and the rod side of the hydraulic cylinder 58, are bundled together, and are latched between the hydraulic cylinder 58 and the pipe by a latching member 62 provided on the connecting member 43B. It is guided by the elastic guide body 61.

The elastic guide body 61 is formed of a tension spring, forms a slack in the left-right direction in the hydraulic hose 60, and the hydraulic hose 60 follows the movement of the hydraulic cylinder 58 accompanying the scooping / dumping operation of the work implement mounting body 40. It is like that.
The slack of the hydraulic hose 60 is pulled in the left-right direction by the elastic guide body 61, so that the slack in the vertical direction is reduced, and the hydraulic hose 60 is prevented from contacting the ground even when the working tool 5 is in a scooping position. it can.

  By extending the hydraulic cylinder 58 or manually operating the lock lever 54 from the unlocked state to the locked state shown in FIG. 11, one end of the lock lever 54 compresses the spring 55 via the sliding member 56. While pushing the link 53, the lock pin 52 is lowered, the tip of the lock pin 52 projects from the lock pin hole 39a of the cylinder guide 49 and the lower engagement portion 42D, and the lock pin hole 39b of the lower engagement portion 41D. To prevent the lower engagement portion 41D from being detached from the lower engagement portion 42D and lock the mounting of the work tool 5.

In the present invention, the shape of each member and the positional relationship between the front, rear, left, and right in the embodiment are best configured as shown in FIGS. However, it is not limited to the said embodiment, A member, a structure can be variously deformed, and a combination can also be changed.
For example, the stay may be taken out from the traveling vehicle body 20, and the hose connector 9 may be attached, or the hose connector 9, the pipe 7, the hydraulic hose 8, the hose guide G, and the like may be disposed on the left boom B side.

The loader work machine 1 may be a tractor / loader / backhoe (TLB), a wheel loader, or the like, and directly connects the tip of the boom B and the work tool cylinder 4 to the work tool 5 without providing the work tool mounting body 40. The work tool 5 may be a fork, a thumb, or the like.
In the hose guide G, the main guide portion G1 and the retraction guide portion G3 may be formed separately, and each may be attached to the boom B or the side frame 2 in the vicinity of the horizontal shaft 30.

1 Loader working machine (front loader)
2 Side frame 3 Boom cylinder 4 Work tool cylinder 5 Work tool 6 Control valve 7 Piping 8 Hydraulic hose 11 Mounting material 12 Bar B Boom G Hose guide G1 Guide part G2 Guide part G3 Retraction guide part

Claims (8)

A pair of left and right side frames (2) and a boom (not shown) whose base is pivotally supported on the top of each of the left and right side frames (2) via a horizontal shaft (30) and which can be raised and lowered via a boom cylinder (3) ( B), a work tool (5) provided at the tip of the left and right booms (B) via a work tool cylinder (4) so as to be rotatable up and down, and the left and right boom cylinders (3) and the work tool cylinder (4). A hose connector (9) connected to a control valve (6) for supplying pressure oil, and piping connected to the boom cylinder (3) and the work tool cylinder (4) to the left and right booms (B) ( 7), a loader working machine in which the pipe (7) and the hose connector (9) are connected by a hydraulic hose (8),
Placed in the vicinity of the horizontal axis (30) is a main guide portion (G1) for route guidance of a midway portion of the hydraulic hose (8) and a connection side of the hydraulic hose (8) separated from the hose connector (9). A loader working machine comprising a hose guide (G) having a retraction guide portion (G3) for holding.   The loader working machine according to claim 1, wherein the hose guide (G) integrally forms a main guide part (G1) and a retraction guide part (G3).   The hose guide (G) has a retraction guide part (G3) above the main guide part (G1), and is connected to the pipe (7) of the hydraulic hose (8) on the front side of the main guide part (G1). The loader working machine according to claim 1 or 2, further comprising a sub-guide unit (G2) for guiding the route.   The hydraulic hose (8) is inserted into the main guide part (G1) from the upper side to the lower side after forming an upward slack (T) from the connection end with the hose connector (9), and the main hose part (G1) 4. The loader working machine according to claim 3, wherein after forming the curved portion (W) on the lower side, the loader working machine is inserted into the auxiliary guide portion (G2) from the lower side to the upper side to reach the pipe (7).   The hose connector (9) is disposed on the side surface of the side frame (2) that supports one boom (B), and the hose guide (G) is fixed to the side surface of the one boom (B). (11) and a bar member (12) connected to the attachment member (11) and projecting forward from the side surface of the boom (B) to the front of the hose connector (9). Item 5. The loader work machine according to any one of Items 1 to 4.   The hose guide (G) has both ends of a loop-shaped bar (12) connected to an attachment (11) fixed to one boom (B), and the bar (12) is attached to the attachment (11). ) Projecting sideways to form a retraction guide part (G3), projecting downward from the end of this retraction guide part (G3), and bulging in a direction away from the boom (B) at the lower part (G1) ), Projecting forward from the front portion of the main guide portion (G1) to form a sub-guide portion (G2), extending upward from the sub-guide portion (G2) and bending toward the boom (B). The loader working machine according to claim 5, wherein the loader working machine reaches the mounting member (11).   The retraction guide portion (G3) of the hose guide (G) is located above the hose connector (9) and in front of and below the main guide portion (G1). The loader working machine described.   The hose guide (G) is formed of a single bar (12), the rear end of the bar (12) is fixed to the upper side of one side frame (2), and from the rear end to the front A main guide portion (G1) that bulges away from the side frame (2) is formed, and a retracting guide portion (G3) having a substantially L-shape in front view projects downward from the front portion of the main guide portion (G1). The loader working machine according to claim 1, 2 or 7, wherein

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