JPH0741288Y2 - Tillage depth control device for tractor work machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an automatic tilling depth control device for a rotary tiller mounted on a tractor.

(B) Conventional Technology Conventionally, the technology for controlling the working depth by the position of the tail wheel attached to the depth frame has been known. For example, it is like the technique described in Japanese Utility Model Laid-Open No. 59-136909, Japanese Utility Model Laid-Open No. 56-136508, and Japanese Patent Laid-Open No. 58-31903.

Further, conventionally, as shown in FIG. 5, the depth frame 2 and the top link mast 12 are connected by a depth adjusting screw 25, and both are in a fixed state unless the depth adjusting handle 24 is rotated. The depth frame 2 cannot move up and down with respect to the rotary tiller during the tilling work. Therefore, the rotary tiller and the ridge forming device
The working equipment such as the ridger is integrally configured, and when the rotary tiller moves up and down by the automatic tilling depth control, the rear-mounted working equipment also moves up and down accordingly, resulting in a step or A wavy phenomenon occurs.

(C) Problems to be solved by the invention The purpose of the present invention is to prevent the rear-mounted working machine, which was conventionally supported to move up and down integrally with the rotary tiller, from bending midway during automatic tilling depth control. In this state, it can be rotated. As a result, even if the rotary tiller moves up and down for the automatic control of the working depth, the rear-mounted working machine does not follow this and keeps a constant position. As a result, the rear mounting work machine functions to hold a certain position in the field like a conventional rear cover, so that the rear mounting work machine such as the ridge former and the ridge riser can serve as a sensor. It is a thing.

(D) Means for Solving the Problems The object of the present invention is as described above, and the configuration for achieving the object will be described below.

In the structure in which the depth frame 2 or the depth beam 3 of the rotary tiller is attached to the field scene forming device of the ridge former / ridger, the front end of the depth frame 2 is pivotally supported on the pivot shaft 7 of the rotary tiller. And top link mast
An urging spring 1 is interposed between the depth frame 2 and the depth frame 2 so that the depth frame 2 can freely rotate up and down during work, and the ridge molding device and the ridge forming device are used as a working depth sensor.・ The rotation position of the ridger is detected as a feedback signal of the rotation angle between the depth frame 2 and the rotary tiller, and the lift arm is controlled by controlling the hydraulic control valve of the tractor.
The 17 can be turned up and down to adjust the working depth.

(E) Configuration of Embodiment The object and configuration of the present invention are as described above. Next, the operation of the invention will be described together with the configuration of the embodiment shown in the accompanying drawings.

FIG. 1 is a side view of the whole working depth control device of the present invention, FIG. 2 is a side view of a rotary tilling device which is vertically moved for automatic working depth control, and FIG. FIG. 4 is a side view of a moving state, FIG. 4 is a perspective view of a depth frame and a biasing spring portion of the present invention, and FIG. 5 is a drawing showing a conventional structure.

First, the overall configuration will be described. A hydraulic case 16 is arranged on the upper surface of the tractor mission case 20. A hydraulic control valve is arranged in the hydraulic case 16, and an arm 19 for operating a spool of the hydraulic control valve is arranged on a side surface of the hydraulic case 16.

One end of the control wire 9 is connected to the arm 19. The lift arm 17 is projected from the hydraulic case 16, and the hydraulic control valve is operated based on the feedback signal from the control wire 9 to move the lift arm 17 up and down.

A lift link 18 is pivotally connected to the tip of the lift arm 17, and a lower end of the lift link 18 is pivotally connected to the lower link 10. The lower link 10 has its front end pivotally supported by the tractor mission case 20 and the like, and its rear end pivotally supported by a part of the rotary tiller.

Further, a top link hinge 13 is projected from the rear surface of the hydraulic case 16, the top link 11 is pivotally connected to the top link hinge 13, and the rear end of the top link 11 is a top link mast.
It is linked to twelve.

Power is transmitted to the bevel gear box 23 of the rotary tiller from the PTO shaft of the tractor through the universal joint shaft 14. A cultivating case 22 is projected downward from the bevel gear box 23, and a spiral pawl 6 is fixedly provided at the lower end of the cultivating case 22 to guide the cultivated soil to the left and right. The ridger 5 is arranged behind the spiral claw 6.

The depth frame 2 is supported at the rear end position of the bevel gear box 23 via a pivot shaft 7. A spring receiver 8 is provided in the middle of the depth frame 2, and the lower end of the depth adjusting screw 25 is inserted into the spring receiver 8. The depth adjusting screw 25
The spring receiver 28 provided on the outer periphery of the upper part and the depth frame 2
The biasing spring 1 is interposed between the spring receiver 8 on the side.

The depth adjusting screw 25 can be adjusted up and down by rotating the depth adjusting handle 24.

The depth frames 2 are arranged on the left and right sides, and the depth beams 3, 3 are inserted into the depth frames 2, 2 from the rear side and fixed by pins. The ridger support rod 4 is attached to the end of the depth beam 3, and the ridger 5 is attached to the lower end of the ridger support rod 4.

A pin 15 is inserted in the middle of the depth frame 2 to fix the inner rear end of the control wire 9. The outer rear end of the control wire 9 is received by an outer receiver 21 protruding from the bevel gear box 23.

(F) Operation of Embodiment The configuration of this embodiment is as described above, and the operation will be described below.

The soil is cultivated by the spiral claw 6 of the rotary cultivator, and the soil is cultivated, and the soil is cultivated and guided to the ridger 5 by moving it to the left and right.

The ridger 5 forms a ridge by raising a groove. In this structure, the ridger 5 does not bite into the soil, so the reference position of the soil is determined. On the other hand, the rotary tiller attached to the tractor moves up and down due to changes in the posture of the tractor, and if the position of the lift arm is constant, the working depth always changes.

In the present invention, the ridger 5 for determining the reference position is attached to the pivot shaft 7.
The ridger 5 is freely supported by, and the ridger 5 can be freely rotated as in the rotation position shown in FIG.

FIG. 3 shows the state of rotation of the ridger 5 when the rotary tiller is set at a constant height.
As shown in the figure, the ridger 5 maintains a fixed position and the rotary tiller moves up and down.

Since the ridger 5 is pivotally supported by the pivot shaft 7, the inclination changes to some extent, but the reference position is secured.

In this way, for the ridger 5 that maintains the reference position,
Since the rotary tiller moves up and down according to the change of the posture of the tractor, the inner wire of the control wire 9 is pulled and the hydraulic control valve is switched by the arm 19. By this operation, the lift arm 17
Is moved up and down, and the rotary tiller is returned to a predetermined working depth.

(G) Effect of the Invention Since the present invention is configured as described above, it has the following effects.

First, the field scene forming devices such as the ridge forming device and the ridge forming device 5 are freely rotatable with respect to the rotary tiller.

That is, the depth frame 2 to which the field scene forming device is fixed
The front end of is rotatably supported by the pivot shaft 7 of the rotary cultivator, and the urging spring 1 is interposed between the top link mast 12 and the depth frame 2 to enable free rotation. Of.

In such a configuration, when the posture of the tractor body is changed according to the unevenness of the field scene, the rotary tiller integrated with the tractor main unit also moves up and down accordingly.

On the other hand, since the farm scene forming device is configured as described above, the reference position is secured by the urging force of the urging spring 1 without performing the same movement as the main unit of the tractor and the rotary tilling device. Of. Therefore, the finished surface is not stepped or wavy.

In addition, since the field scene forming device also detects the vertical movement of the rotary tiller and also functions as a feedback sensor, it is not necessary to provide a separate sensor, which has many advantages such as simplification of the structure and reduction of the number of parts. Is generated.

Secondly, since the conventional rear-mounted working machine is substantially integrated with the rotary tiller, when the rotary tiller is moved up and down by the automatic tillage depth control, the ridge forming device, the ridger, etc. are moved up and down. Although it moved, there was stepping and waviness on the finished surface based on automatic control.However, as the present invention supported the rotary tiller and the rear mounting work machine so that they could freely rotate, Was able to be eliminated.

Thirdly, when a rear mounting work machine such as a ridge former or a ridger is conventionally installed, in order to make the working depth constant with a tail wheel,
The automatic plowing control was not possible.

By providing the ridge forming device and the ridge standing device 5 as in the present invention, it was possible for the first time to perform automatic plowing control even when the rear mounting work machine was mounted.

[Brief description of drawings]

FIG. 1 is a side view of the whole working depth control device of the present invention, FIG. 2 is a side view of a rotary tilling device which is vertically moved for automatic working depth control, and FIG. FIG. 4 is a side view of a moving state, FIG. 4 is a perspective view of a depth frame and a biasing spring portion of the present invention, and FIG. 5 is a drawing showing a conventional structure. 1 ... Biasing spring 2 ... Depth frame 3 ... Depth beam 4 ... Ridge support rod 5 ... Ridge device 6 ... Spiral claw 7 ... Pivot shaft 12 ... Top link mast 17 ... Lift arm

Claims (1)

[Scope of utility model registration request] 1. A structure in which a depth frame 2 or depth beam 3 of a rotary tiller is attached to a field forming device of a ridge forming device / ridge forming device, and a front end of the depth frame 2 is a pivotal support of the rotary cultivating device. It is pivotally supported on the shaft 7, and the biasing spring 1 is provided between the top link mast 12 and the depth frame 2.
The depth frame 2 can be freely rotated up and down during work, and the ridge forming device and the ridger are used as a plowing depth sensor, and the rotating position of the ridge forming device and the ridger is determined by the depth frame 2 The rotation angle between the rotary tiller and the rotary cultivator is detected as a feedback signal, and by the control of the hydraulic control valve of the tractor,
A tilling depth control device for a tractor working machine, characterized in that a lift arm 17 can be rotated up and down to adjust the tilling depth.