JPH0610735Y2 - Automatic plowing control device - 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 controlling a rotary tiller mounted on the rear part of a tractor to a constant tilling depth.

(B) Conventional Technology Conventionally, a technology for converting the vertical rotation of the rear cover into an electric signal by a depth converter for automatic control of the working depth has been known.

For example, Japanese Utility Model Publication No. 61-104015 and Japanese Utility Model Publication No. 6
1-47213, JP-A-60-251803, JP-A-60-192501, and Japanese Utility Model Publication No. Sho-6.
It is the same as the technique described in Japanese Patent Publication No. 0-85107 and Japanese Utility Model Laid-Open No. 52-55817.

(C) Problems to be Solved by the Invention The purpose of the present invention is that, in the conventional configuration, since the depth converter is arranged on the rear cover or the till cover of the rotary tiller, muddy water is constantly converted to the depth. There was a problem that the rotary tiller was a part where vibration was caused by the rotation and biting of the tiller, and the durability of the depth converter deteriorated.

If a depth converter, which is an electrical component, is installed on the side of the rotary cultivator, it is troublesome to remove and attach the harness when removing the rotary cultivator from the tractor. There is also a problem that the sticking prevention process becomes complicated.

In the present invention, the feedback wire, which is easier to handle than the harness, is extended to the tractor side.

In addition, such a depth converter and position converter,
Both of them are fixed to a bracket, and the bracket is fixed to a hydraulic case to centrally arrange electronic components and to protect from vibration and mud.

(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.

The rear cover 1 of the rotary tiller is used as a working depth sensor, and the lift arm 1 is based on the detection value of the working depth sensor.
The rear cover 1 in the tilling depth control device for vertically moving the 2
The vertical rotation of the rear cover 1 is mechanically transmitted to the depth converter 18 on the tractor side through the feedback wire 7. The depth converter 18 converts the rotation angle of the rear cover 1 into an electric signal and lifts the lift. A position converter 17 for converting the rotation angle of the arm 12 into an electric signal is provided, and the lift arm 12 is moved up and down by comparing the electric signal of the depth converter 18 with the electric setting value of the depth setting device, Both the converter 18 and the position converter 17 are supported by a bracket 22 fixed to a hydraulic case 19.

(E) Embodiment The purpose and construction of the present invention are as described above. Next, the construction of the embodiment shown in the accompanying drawings will be described.

FIG. 1 is a side view showing a state in which a rotary tiller is mounted on the rear part of the tractor, FIG. 2 is a side view of the hydraulic case 19, and FIG. 3 is a plan view of the same.

The overall configuration will be described with reference to FIG.

The rotary tiller is supported by a top link, a lower link, or the like protruding from the rear part of the tractor, and is vertically movable by a lift arm 12.

The power for rotating the tiller 3 is transmitted from the tractor side via the universal joint.

In this embodiment, the cultivating cover 2 itself is adjustable forward and backward, and the position of the rear cover 1 pivotally supported by the pivot shaft 4 at the rear part of the cultivating cover 2 is also forward and backward according to the cultivating cover 2. It is possible to adjust.

It is the tilling cover adjusting lever 10 that changes the position of the tilling cover 2 with respect to the tilling claw 3, and the tail wheel adjusting lever 11 that adjusts the tail wheel support rod up and down is also provided as in the prior art.

The front-back adjustment of the tilling cover 2 is performed by allowing the tilling cover 2 to rotate back and forth around the pawl shaft of the tilling claw 3, whereby the rotary tiller is moved up and down. The cultivating cover 2 is adjustable so as to always cover a fixed position above the cultivating claw 3.

The rear cover 1 is pivotally supported at the rear end of the tilling cover 2 by a pivot shaft 4, and the up and down rotation of the rear cover 1 is changed by the arm 5 and the link 6 to the forward and backward movement amount, and the feedback wire 7 is used. The inner wire 7a is pulled to give feedback.

The feedback wire 7 supports the outer wire portion on the outer receiver 8, and the inner wire 7 a protruding from the outer wire is fixed to the tip of the link 6.

The inner wire 7a at the other end of the feedback wire 7 is connected to the arm 9 on the hydraulic case 19 side.

Next, FIGS. 2 and 3 will be described.

Since the automatic plowing depth control device of the present invention is an electric control that controls based on an electric set value and a feedback value, neither a position lever nor a depth lever is attached, and instead, a position setter and a depth setter are used. A rotary encoder etc. is attached.

Conventionally, mechanically set and mechanically compared, but in the present invention, all are set to electrical values,
We are feeding back and making further comparisons. Similarly,
The hydraulic valve is also a solenoid valve and is electrically operable.

Therefore, in the present invention, it is necessary to convert the vertical rotation of the rear cover 1 into an electric value, and the depth converter 18 performs the conversion.

In addition, the amount of rotation of the lift arm 12 is set to an electrical value,
A position converter 17 for feedback is also provided, and the position converter 17 is also arranged near the depth converter 18 described above.

Both the depth converter 18 and the position converter 17 are fixedly supported by a bracket 22 attached to the hydraulic case 19.

And the arm 9 is arranged inside the lift arm 12,
An inner wire 7a is connected to the arm 9.
Then, the link 1 passing under the lift arm 12
5 is pivotally connected to a pivot arm 20 of the depth converter 18.

The position converter 17 is arranged outside the lift arm 12, and the lift arm 12 is rotated up and down by switching the solenoid valve, and the value for feeding back the rotation amount to the solenoid valve is position converted. The vessel is transmitting.

That is, the fixed arm 13 is attached to the rotation base of the lift arm 12, and the rotation arm 21 is rotated by the link 14 pivotally connected to the fixed arm 13.

The depth converter 18 and the position converter 17 transmit the feedback value converted into an electric signal into the control box for comparison control, and, conversely, the control signal is transmitted to the solenoid valve.

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

First, in the conventional configuration, since the depth converter is arranged on the rear cover or the till cover of the rotary tiller, there is a risk that muddy water will always reach the depth converter and short-circuit the electric circuit. However, as in the present invention, the depth converter 18 can be arranged in the upper part of the tractor at a portion where the muddy water does not reach, to protect it.

Secondly, the rotary tiller is a part where vibration is particularly strong due to the rotation or biting of the tilling claw, and if a depth converter is laid in this part, the durability of the depth conversion deteriorates.

In the case of the present invention, the depth converter 18 is attached to the hydraulic case 19.
This vibration can be minimized by providing it in the part of.

Thirdly, if a depth converter, which is an electrical component, is mounted on the rotary tiller side, the harness desorption process is troublesome when the rotary tiller is detached from the tractor, and the rotary tiller is not suitable. There was also the problem that if the harness was removed, the harness would rust if left unattended. On the other hand, in the present invention, the feedback wire, which is easier to process than the harness,
Since it was extended to the side of the tractor, this problem could be resolved.

Fourth, by fixing both the depth converter and the position converter to the bracket, and fixing the bracket to the hydraulic case, electronic components are centrally arranged, and the bracket 22 is a portion with little vibration. , It was possible to protect electronic components from vibration and mud.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a rotary tiller is mounted on the rear part of the tractor, FIG. 2 is a side view of the hydraulic case 19, and FIG. 3 is a plan view of the same. 1 ... Rear cover 2 ... Tillage cover 7 ... Feedback wire 7a ... Inner wire 9 ... Arm 18 ... Depth converter 19 ... Hydraulic case 22 ... Bracket

Claims (1)

[Scope of utility model registration request] 1. A tillage depth control device in which a rear cover 1 of a rotary tiller is used as a tillage depth sensor, and a lift arm 12 is moved up and down based on a detection value of the tillage depth sensor. Mechanically transmitted to the depth converter 18 on the side of the tractor via the., The rotation angle of the rear cover 1 is converted into an electric signal by the depth converter 18, and the lift arm 12 is also used.
Is provided with a position converter 17 for converting the rotation angle of the above into an electric signal, and the lift arm 12 is moved up and down by comparing the electric signal of the depth converter 18 with an electric set value of the depth setter, and the depth converter An automatic tilling depth control device characterized in that both 18 and the position converter 17 are supported by a bracket 22 fixed to a hydraulic case 19.