JPS637Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an attachment device for a feedback wire in an automatic plowing depth adjustment device of a rotary tillage device installed on an agricultural tractor.

As an automatic tillage depth device that maintains the plowing depth of a rotary tiller at a set value, in a device that feeds back the up/down rotation state of the rear cover of the rotary tiller to the position control lever of an agricultural tractor, there is a means for feedbacking the movement of the rear cover. Conventionally, the inner feedback wire was fixed to the rod that rose and fell as the rear cover moved up and down, but since the bracket that supported the rod was fixed to the frame of the tilling equipment, the rear cover did not move up and down when tilling. Each time it rotates, the rod moves up and down and swings back and forth.
For this reason, if the outer wire is simply fixed to the frame, the inner wire will be bent and deformed each time the rod swings, and in extreme cases, the inner wire may be severed. When the rod suddenly moves up and down due to the impact of rough roads, etc., the bending deformation of the inner becomes even more severe, and there is a risk that the inner may be damaged.

The present invention was devised to eliminate the above-mentioned drawbacks, and its purpose is to set the plowing depth by feeding back the movement of the rear cover of the rotary tiller to the position control lever via wires. In a rotary automatic tiller that automatically maintains a value, the vicinity of the upper end of a rod that moves up and down as the rear cover moves up and down is raised and lowered by a bracket supported by a rotation axis parallel to the rotation axis of the rear cover. Insert it freely and fix the outer part of the feedback wire from below toward the pivot axis of the bracket, and slide the inner part, which is tensioned toward the control lever, into the stopper attached to the upper end of the rod. By inserting the rod freely and supporting the inner so that it only follows the stopper when it rises and does not follow it when it falls, the tip of the rod swings back and forth as the rear cover moves up and down during tillage work. The fixing position of the outer part rotates with the rod, and the tip of the wire is always kept parallel to the rod, preventing the inner part from bending.In addition, when driving on the road, the rod will not suddenly bend due to impact from rough roads, etc. Even in the event of a downward movement, only the rod moves downward, reliably preventing excessive force from being applied to the inner, and significantly improving the reliability and durability of the feedback provided by the wire. It is an object of the present invention to provide a wire attachment device for a rotary automatic deep tilling device.

The structure of the present invention will be explained with reference to an embodiment shown in the drawings. 1 is the body of an agricultural tractor, and a rotary tiller 3 is attached to the rear part of the tractor via a three-point link 2 so as to be able to move up and down. There is. Reference numeral 4 denotes a rear cover of the rotary tiller 3, which is mounted so as to be rotatable up and down via a rotation shaft (not shown) extending in the left-right direction. Reference numeral 5 denotes a rod whose lower end is connected to the rear cover 4 so as to be rotatable back and forth, and a bracket 6 is inserted near the upper end of the rod so as to be movable up and down. 7 is a rotating shaft fixed to the bracket 6, 8
Reference numeral denotes an insertion hole for the rod 5, and reference numeral 9 represents an outer attachment hole for the wire. Both the insertion hole 8 and the attachment hole 9 are bored on the axis of the rotating shaft 7. Reference numeral 10 denotes a support fixed to the frame of the tillage device 3, which is inserted into the rotation shaft 7 through a hole 11 drilled in the support 10 and extending in the left-right direction, and is locked with an E-ring 12 to prevent it from coming off. As a result, the bracket 6 is mounted so as to be rotatable back and forth.

13 is a beta pin 14 at the upper end of the rod 5.
A stopper that is inserted and locked by the metal fitting 13.
A shock absorbing coil spring 15 is inserted between the lower end of the bracket 6 and the upper surface of the bracket 6. Reference numeral 16 denotes a feedback wire, the outer 17 of which is fixed from below to a mounting hole 9 provided in the bracket 6 on the rotation axis. Further, a pin 19 is slidably inserted into the protruding end of the inner wire 18 passing through the bracket 6 of the wire 16 to prevent it from coming off. And the pin 19
The inner 18 of the wire 16 and the rod 5 are connected by being supported from below by the recess 20 of the stopper 13 and being engaged and held by the beta pin 21. Note that the outer 17 of the wire 16
The vicinity of the tip of the inner 18 and the rod 5 are held parallel to each other, and the inner 1
By forming a groove 22 through which the rod 8 is slidably inserted, the inner 18 is left behind when the rod 5 is suddenly lowered.

A feedback rod 23 is connected to a position control lever 24 provided on the agricultural tractor, and the tip of the rod 23 is slidably inserted into a cylinder 25. Further, an outer 17 of the wire 16 is attached to the other end of the cylinder 25.
is fixed, and the tip of the inner 18 protruding from the outer 17 is connected to the feedback rod 23 within the cylinder 25, and the feedback rod 23 is biased to protrude toward the position control lever 24. By tensioning the spring 26 inside the cylinder 25, the inner 18 is pulled and biased toward the control lever 24;
The rod 5 is urged to slide downward via the pin 19 and the stopper 13, and the rear cover 4 is accurately rotated up and down in accordance with changes in the unevenness of the ground.

The rod 5 is also urged to slide downward by the spring 15', so that the rear cover 4 is constantly urged to rotate downward. 27 is a lift arm.

Next, the operation of the present invention constructed as described above will be explained. Now, when the position control lever 24 is moved to a predetermined position, the lift arm 27 is rotated, the three-point link 2 is raised and lowered, and the rotary tiller 3 is moved to a predetermined position. Further, since the rear cover 4 changes to follow the tilled soil surface, it is held at the predetermined position a in FIG. 1.

On the other hand, when the plowing depth becomes deeper than a predetermined value due to unevenness of the field, etc., the rear cover 4 relatively rotates upward and moves to position b. Then, the rod 5 rises while rotating the bracket b, and the inner 18 is pulled up via the stopper 13 and pin 19. Therefore, the spring 26 in the cylinder 25 is compressed and the feedback rod 2
3 is pulled rearward, the position control lever 24 is pulled rearward (in the upward direction). Therefore, the lift arm 27 is rotated upward, and the rotary tiller 3 is lifted up via the three-point link 2, so that the plowing depth is returned to the predetermined value. As a result, the rear cover 4 is returned to position a, so that the plowing depth is maintained constant.

On the other hand, when the plowing depth becomes shallower than the predetermined value and the rear cover 4 moves to position c, the rod 5 is lowered and the tension of the spring 26 in the cylinder 25 causes the wire 1
As the inner 18 of No. 6 is returned, the feedback rod 23 is pushed forward, and the position control lever 24 is pushed in the downward direction. Then, the lift arm 27 descends, and the rotary tilling device 3 descends. In this way, when the plowing depth gradually increases and the rear cover 4 is returned to position a, the inner 18 is pulled back to its original position, so the position control lever 24 is also returned and the lowering of the rotary tillage device 3 is stopped. The plowing depth is maintained at a predetermined value.

By the way, when the rear cover 4 is rotated up and down, the rod 5 swings back and forth about the rotation axis 7 while going up and down, and the stopper 13 is attached to the rod 5.
The tip of the wire 16 connected via the rod 5 is also swung through the bracket 6, and the mounting position of the outer 17 is rotated on the rotation axis of the bracket 6, so that the inner 18 is not separated from the outer. There is no risk that the protruding portion will be bent or deformed. Also, the tip of the wire 16 is connected to the rod 5.
Since it is held parallel to the inner rod 23, even if the rod 5 swings back and forth, the inner 18 can be prevented from bending, and the movement of the rod 5 can be controlled by the feedback rod 23.
can be faithfully communicated.

And only when rod 5 rises, inner 1
8 is restrained, and when the rod 5 rapidly descends, the inner 18 slides in the groove 22 carved in the recess 20,
Since only the rod 5 descends separately to release the inner 18, even if the rod 5 suddenly descends due to the impact of rough roads when driving on the road, it is ensured that the inner 18 will not be bent due to excessive force. can be prevented.

In short, the present invention is a rotary automatic tiller in which the movement of the rear cover of the rotary tiller is fed back to the position control lever via wires to automatically maintain the plowing depth at a set value. The upper end of the rod, which moves up and down as the rod moves up and down, is inserted into a bracket supported by a rotation axis parallel to the rotation axis of the rear cover so as to be able to move up and down, and the outer part of the feedback wire is inserted toward the rotation axis of the bracket. is fixed from below, and an inner member tensioned toward the control lever is slidably inserted into a stopper attached to the upper end of the rod, and the inner follows the stopper only when it rises, and when it descends. During tilling work, the rear cover, which is biased downward by the tensile force of the inner, moves up and down accurately as the unevenness of the ground changes, and the rear cover moves up and down. Even if the rod swings back and forth, the tip of the wire is always held parallel to the rod, and the inner protruding from the outer fixed to the pivot axis of the bracket will not bend or deform. This is not only possible to reliably prevent the inner from breaking, but when driving on the road, even if the rod suddenly descends due to impact from rough roads, the inner will follow the stopper. By lowering only the rod and preventing the inner from bending, the rod will not descend suddenly. Therefore, the smooth and accurate movement of the inner will be maintained and the reliability of the feedback by the wire will be improved. This has an extremely useful practical effect of significantly improving durability.

[Brief explanation of the drawing]

The drawings show an embodiment of the wire attachment device for a rotary automatic tilling depth device according to the present invention, in which FIG. 1 is an overall side view, FIG. 2 is a side view of the main parts showing the operating state, and FIG. The figure is an exploded perspective view of the main parts, and FIG. 4 is a cross-sectional view showing how the other end of the wire is attached. In the figure, 1... Agricultural tractor body, 3... Rotary tilling device, 4... Rear cover, 5... Rod, 6... Bracket, 7... Rotating shaft, 13...
Stopper, 16...Wire, 17...Outer,
18...Inner, 23...Feedback rod, 24...Position control lever, 2
6... It is a spring.

Claims (1)

[Scope of utility model registration request] In a rotary automatic tillage device in which the movement of the rear cover of the rotary tillage device is fed back to a position control lever via a wire to automatically maintain the plowing depth at a set value, the rear cover moves up and down as the rear cover rotates up and down. Insert the vicinity of the upper end of the rod into a bracket supported by a rotation axis parallel to the rotation axis of the rear bar so as to be able to move up and down,
Fixing the outer part of the feedback wire from below toward the pivot axis of the bracket, and slidably inserting the inner part tensioned toward the control lever into a stopper attached to the upper end of the rod. A wire attachment device for a rotary automatic tiller, characterized in that the inner is supported so that it follows the stopper only when it goes up, and does not follow it when it goes down.