JP2001169604A - Lifting mechanism for working unit in agricultural machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lifting mechanism for farm work machine that can do the motion of lifting the farm work machines in parallel and of lifting and descending the machine, as it is rotated. SOLUTION: The top link is constituted of the root edge side link constitution perpendicular-rotatably connected to the main machine and with the top edge side link constitution that is perpendicular-rotatably connected to the top edge of the root edge side link constitution. Simultaneously, this lifting mechanism is equipped with the root edge side link rotation inhibitor for inhibiting the root edge side link constitution from vertical rotation by fixing the root edge side link constitution to the main machine body and with the top edge side link rotation inhibitor for inhibiting the top edge side link constitution from vertical rotation by fixing the top edge side link constitution to the main machine body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine lifting mechanism for an agricultural working machine.

[0002]

2. Description of the Related Art Conventionally, a working machine lifting mechanism of a farm working machine has a base end of a top link and a base end of a lower link which constitute a parallel link in a self-propelled machine, which are vertically rotatable. A hitch for mounting a working machine is provided between the tip of the top link and the tip of the lower link, and a hydraulic cylinder for lifting is interposed between the machine and the hitch.

[0003] By extending the lifting hydraulic cylinder, the working machine mounted on the hitch is raised in parallel, while the lifting hydraulic cylinder is shortened.
The work equipment mounted on the hitch was lowered in parallel.

[0004]

However, since the above-described conventional working machine lifting / lowering mechanism of the agricultural working machine is constituted by parallel links, the working machine is moved up and down in parallel only by moving the working machine around one point. It was not possible to perform an operation of rotating the device up and down.

[0005] Therefore, when a work machine such as a ridge coater or a cultivator is mounted on the rear portion of the machine via a work machine elevating mechanism, the work machine cannot be jumped high from a field scene.
During traveling in the field, the work machine may collide with obstacles, ridges and the like on the field scene, and the work machine may be damaged.

[0006]

Therefore, according to the present invention, a base end of a top link and a base end of a lower link are arranged on a self-propelled machine so as to be vertically rotatable, respectively. In a working machine lifting mechanism of an agricultural working machine having a hitch for mounting a working machine between a leading end portion and a leading end portion of a lower link, a top link is a base machine which is connected to the machine in a vertically rotatable manner. An end-side link structure and a distal-side link structure connected to the distal end of the base-side link structure so as to be vertically rotatable, and the base-side link structure is fixed to the machine. Proximal link rotation preventing means for preventing vertical rotation of the proximal link structure; and vertical rotation of the distal link structure by fixing the distal link structure to the proximal link structure. And a tip side link rotation preventing means for preventing the

[0007] At least one of the proximal link structure and the distal link structure is formed to be extendable and contractible.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A working machine elevating mechanism for an agricultural work machine according to the present invention has a base end of a top link and a base end of a lower link arranged on a self-propelled machine so as to be vertically rotatable. And
Between the tip of the top link and the tip of the lower link,
A hitch for mounting the work machine is provided.

In addition, a base-side link structure in which the top link is connected to the main body so as to be vertically rotatable, and a distal-side link in which the top link is vertically connected to the distal end of the base-side link structure. And a base link rotation preventing means for fixing the base link structure to the main unit and preventing the base link structure from turning up and down on the top link. A distal link rotation preventing means for fixing the distal link structure to the proximal link structure and preventing the vertical link structure from rotating up and down is provided.

Therefore, when the vertical link rotation preventing means prevents the vertical rotation of the distal link structure, the proximal link structure and the distal link structure integrally rotate vertically. Thus, the working machine can be moved up and down while maintaining the parallel state.

On the other hand, in the case where the vertical rotation of the proximal link structure is prevented by the proximal link rotation preventing means, only the distal link structure at the distal end of the proximal link structure is vertically rotated. To move the work implement up and down by pivoting the work implement in a vertical direction about one point, so that the lower end of the work implement can be flipped high from the field scene, thereby making it possible to work while traveling in the field. The lower end of the machine can be prevented from colliding with obstacles, ridges and the like on the field scene, and damage to the working machine can be prevented.

As described above, the operation of raising and lowering the work machine in parallel and the operation of raising and lowering the work machine while rotating the work machine can be performed by one work machine raising / lowering mechanism. It can be easily realized only by switching the blocking means, and the working efficiency can be improved.

The length of the proximal-side link structure or the distal-side link structure can be adjusted by forming at least one of the proximal-side link structure and the distal-side link structure to be extendable. This makes it possible to absorb manufacturing errors and assembly errors of parts.

In addition, it is possible to appropriately adjust the turning radius of the working machine by the working machine lifting mechanism.

[0015]

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

FIG. 1 is a view showing a working machine elevating mechanism 1 according to the present invention. The working machine elevating mechanism 1 is interposed between a rear part of a tractor 2 serving as an agricultural working machine and a working machine 3. ing.

The work implement elevating mechanism 1 includes a top link 5 having a base end pivotally connected to a top link bracket 4 formed at an upper rear end of the tractor 2 so as to be vertically rotatable, and a base end at a lower rear end of the tractor 2. A pair of left and right lower links 6, 6 pivotally connected to each other in a vertically rotatable manner, and a substantially inverted U-shaped hitch 7 interposed between the distal end of the top link 5 and the distal end of the lower links 6, 6. It is composed of In the figure, reference numeral 30 denotes an airframe, and 31 denotes a PTO shaft.

The work implement elevating mechanism 1 constitutes a parallel link by arranging the top link 5 and the lower links 6, 6 to be equal in length and arranged in parallel.

As shown in FIGS. 1 and 2, the top link 5 includes a base-side link structure 8 connected to the rear end of the tractor 2 so as to be vertically rotatable, and a base-side link structure 8. And a distal end side link structure 9 which is connected to the distal end portion so as to be vertically rotatable.

The proximal link structure 8 has a pair of left and right link plates 10, 11 each having a substantially triangular shape in a side view and pivotably attached to the upper portion of the top link bracket 4 so as to be vertically rotatable. A connecting plate 12 is erected between the upper portions of the 10,10. In the figure, 13
Is a proximal rotation shaft.

Further, the base-side link structure 8 is fixed to the tractor 2 to prevent the base-side link structure 8 from turning up and down. The movement prevention means 14 is provided.

The proximal link rotation preventing means 14 has a fixed pin insertion hole 15 formed in the lower part of the top link bracket 4 and a fixed pin insertion hole 16 formed in the lower part of the base of the link plates 10 and 11. Then, the fixing pins 17 are inserted through the fixing pin insertion holes 15 and 16.

The proximal link rotation preventing means 14 is
By inserting the fixing pins 17 into the fixing pin insertion holes 15 and 16, the proximal link structure 8 is fixed to the top link bracket 4, and the proximal link structure 8 is rotated by the proximal rotation shaft 13.
, And by pulling out the fixing pin 17 from both the fixing pin insertion holes 15 and 16, the proximal link structure 8 is moved around the proximal rotation shaft 13. To rotate vertically.

The distal link member 9 has a proximal end of a proximal rod 18 pivotally mounted between the distal ends of both link plates 10 and 11 of the proximal link member 8 so as to be vertically rotatable. A tip rod 19 is connected to the tip of the end rod 18 via a turnbuckle 20. In the figure, reference numeral 21 denotes a tip-side rotation shaft, and reference numerals 22 and 23 denote bosses.

As described above, the distal link structure 9 is configured to be extendable and retractable by the turnbuckle 20. still,
In the present embodiment, the distal link structure 9 is configured to be extendable and contractible, but the proximal link structure 8 may be configured to be expandable and contractible.

The distal end link structure 9 is fixed to the distal end of the proximal end link structure 8 so that the distal end link structure 9 can be rotated up and down. A tip side link rotation preventing means 24 for preventing the rotation is provided.

The distal link rotation preventing means 24 is provided with a fixed pin insertion hole 25 in the middle of both link plates 10 and 11 of the proximal link structure 8, while the base link structure 9 has A fixed plate 26 extending forward is connected to the base end of the end rod 18, and a fixed pin insertion hole 27 is formed at the front end of the fixed plate 26, and fixed to both fixed pin insertion holes 25, 27. Pin 28 is inserted.

The leading end link rotation preventing means 24 is
By inserting the fixing pins 28 into both the fixing pin insertion holes 25 and 27, the proximal link members 8 and the distal link members 9 are inserted.
Is fixed so that the distal link member 9 does not rotate around the distal rotation shaft 21, while the fixing pin 28 is pulled out from both the fixing pin insertion holes 25 and 27, whereby The side link structure 9 is configured to rotate in the vertical direction about the tip-side rotation shaft 21.

The hitch 7 has hooks 29 formed at the lower left and right ends and the upper end thereof, and the work implement 3 is locked by the hooks 29.

The work machine elevating mechanism 1 is constructed as described above, and as shown in FIG.
In the case where only the vertical rotation of the distal link structure 8 is prevented by the 24, the proximal link structure 8 and the distal link structure 9 rotate integrally in the vertical direction, 3
Is raised and lowered while maintaining the parallel state.

On the other hand, when the vertical rotation of the proximal link structure 8 is prevented by the proximal link rotation preventing means 14, the distal link structure 9 is provided at the distal end of the proximal link structure 8. Only rotates vertically, and the working machine 3 is vertically rotated about the distal-end-side rotation shaft 21 to move up and down.

Therefore, when the vertical rotation of the proximal link structure 8 is prevented by the proximal link rotation preventing means 14, the lower end of the working machine 3 can be flipped up from the field scene. Thus, it is possible to prevent the lower end portion of the working machine 3 from colliding with an obstacle, a ridge or the like on the field scene while traveling on the field, and to prevent the working machine 3 from being damaged.

As described above, with one working machine elevating mechanism 1,
The operation of raising and lowering the work machine 3 in parallel and the operation of raising and lowering the work machine 3 while rotating the work machine 3 can be easily realized simply by switching the base-side rotation prevention means 14 or the distal-side rotation prevention means 24. And work efficiency can be improved.

Further, in this embodiment, since the distal link structure 9 is formed so as to be extendable and contractible, by adjusting the length of the distal link structure 9, it is possible to absorb manufacturing errors and assembly errors of parts. can do.

Further, the turning radius of the work machine 3 by the work machine elevating mechanism 1 can be appropriately adjusted.

[0036]

The present invention is embodied in the form described above and has the following effects.

(1) In the present invention, the top link is connected to the main unit so as to be vertically rotatable, and the top link is connected to the distal end of the base link so as to be vertically rotatable. And a top end link structure for fixing the base end link structure to the top link and preventing the base end link structure from rotating up and down. Movement preventing means, and distal link rotation preventing means for fixing the distal link structure to the proximal link structure to prevent vertical rotation of the distal link structure. When the vertical link rotation inhibiting means prevents the vertical rotation of the distal link structure, the proximal link structure and the distal link structure rotate vertically together to move the working machine in parallel. You can move up and down while maintaining the state,
In the case where the vertical rotation of the proximal link structure is prevented by the proximal link rotation preventing means, only the distal link structure is vertically rotated at the distal end of the proximal link structure, and the work is performed. The machine can be turned up and down by rotating the machine vertically about one point, and the lower end of the work machine can be flipped up from the field scene. It is possible to prevent collision with obstacles, ridges, and the like on the field scene, and prevent damage to the working machine.

As described above, the operation of raising and lowering the work machine in parallel and the operation of raising and lowering the work machine while rotating the work machine can be performed by one work machine lifting / lowering mechanism. It can be easily realized only by switching the blocking means, and the working efficiency can be improved.

(2) In the present invention, at least one of the proximal link structure and the distal link structure is formed to be extendable and contractible. By adjusting the length, manufacturing errors and assembling errors of parts can be absorbed.

Further, the turning radius of the working machine by the working machine elevating mechanism can be appropriately adjusted.

[Brief description of the drawings]

FIG. 1 is a side view showing a working machine elevating mechanism of a farm working machine according to the present invention.

FIG. 2 is a plan view showing a top link.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 work implement lifting mechanism 2 tractor 3 work implement 5 top link 6 lower link 7 hitch 8 base end link structure 9 front end link structure 13 base end rotation shaft 14 base end link rotation prevention means 20 turnbuckle 21 Tip rotation shaft 24 Tip link rotation prevention means

Claims (2)

[Claims] 1. A self-propelled machine is provided with a base end of a top link and a base end of a lower link so as to be vertically rotatable, respectively. In the working machine elevating mechanism of the agricultural working machine, which is provided with a hitch for mounting the working machine, a top link includes a base side link structure that is connected to the machine in a vertically rotatable manner; A front link structure which is vertically connected to the distal end of the side link structure so as to be freely rotatable, and the base link structure is fixed to the machine to rotate the base link structure up and down. And a distal link rotation for fixing the distal link structure to the proximal link structure to prevent vertical rotation of the distal link structure. A work machine lifting / lowering mechanism for an agricultural work machine, comprising a blocking means. 2. The working machine lifting mechanism for an agricultural work machine according to claim 1, wherein at least one of the base end side link structure and the front end side link structure is formed to be extendable.