JPH0474966B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a tillage depth control device for a tiller in which the tiller is attached to the rear of a tractor so that the tiller can be raised and lowered.

(b) Prior art Conventionally, a tilling device is attached to the rear of a towing vehicle, a cover angle detector is attached to the rear cover of the tilling device, and the detected value of the cover angle detector is used as the tilling depth setting value of the tilling depth control circuit. There are already many known systems that automatically control plowing depth.

(c) Problems to be Solved by the Invention The tilling depth control device of conventional tilling equipment only compares the change in the angle of the rear cover with the set tilling depth. Therefore, when the tillage conditions differ, the running devices such as tires may become weak. In farm fields, the amount of subsidence is large, and in hard fields, the amount of subsidence is small.

Further, even in the same field, the amount of sinking of the traveling device differs greatly depending on the purpose of the work, for example, plowing work and plowing work.

In other words, the tilling depth a during general tilling work (see Figure 4) is determined by comparing the cover angle of the rear cover with the set tilling depth and controlling the tilling depth accordingly. When working in a plowing field with the depth a set, the tires will sink significantly in the plowing field and the tilling device will rise relatively as shown by the chain line, and in this state the cover angle β will be the same as above. The plowing depth is adjusted until it becomes equal to α, resulting in an extremely large plowing depth b.

Therefore, the operator has to manually adjust the plowing depth by manually adjusting the plowing depth adjustment lever or dial, which is extremely troublesome and has drawbacks such as inaccurate plowing depth.

(d) Means for solving the problem The present invention provides a method for setting an appropriate plowing depth even when the field conditions are different, such as a flat field, a field where tires run between furrows, a hard field, a soft field, or a plowing field. The purpose is to provide a tillage depth control device for a tillage device that can always automatically perform tillage to a predetermined depth.A cover angle detector is attached to the rear cover that covers the rotary, and the tiller is controlled by the detection signal from the cover angle detector. In a tillage device adapted to perform depth adjustment, an attitude detector is attached to the tillage device, the attitude detector and the cover angle detector are connected to a correction circuit of a tillage depth control circuit, and the cover angle detector detects the tillage depth. The present invention is characterized in that the plowing depth is adjusted by correcting the value using the detected value of the attitude detector and comparing this corrected value with the set value of the plowing depth setting device.

(e) Effect In fields where the tilling depth is set using the setting device of the automatic tilling depth control device and the amount of tire settling is small, the angle of the tilling device does not change, so the tilling depth is set based on the detected value of the cover angle detector on the rear cover. The depth is automatically adjusted, and in fields where the amount of tire settlement is large, the detected value of the cover angle detector is corrected by the detected value of the posture detector, making it possible to automatically maintain an appropriate plowing depth.

(F) Embodiment 1 is a rear wheel of a tractor, and a tilling device 4 is attached to the rear of the rear wheel so that it can be raised and lowered by lower links 2, 2 and an upper link 3, and the lower links 2, 2 are connected to a lift. Lift rod 5a, 5 to arm 5
They are connected via a.

In addition, the tilling device 4 has a large number of tilling claws 4a attached to the tilling shaft, similar to the conventional one, and is operated by a tractor.
The tilling shaft is driven by a transmission case 6 interlocked with the PTO shaft, a rear cover 8 is tiltably connected to the rear of the rotary cover 7, and an arm 9 protruding from the rear cover 8 is provided on the rotary cover 7. It is operatively connected to the detection arm 11 of the cover angle detector 10 via a rod 12.

A posture detector 13 is mounted on the rotary cover 7 to detect the angle with respect to the horizontal.
The attitude detector 13 and the cover angle detector 10 are connected to a correction circuit 14 of the automatic tillage depth control circuit as shown in FIG. The set value of the plowing depth setter 15 is compared by a comparator 16, and the solenoid valve drive circuit 17 of the hydraulic cylinder that operates the lift arm 5 based on the output operates the solenoid valve 18 to raise and lower the tilling device 4. , the detection value detected by the cover angle detector 10,
The cover angle during normal tilling work when the tilling depth is set to a in Fig. 1 is corrected based on the detected value detected by the posture detector 13 based on the angle change caused by the raising and lowering of the tilling device 4. α and the cover angle β after adjusting the plowing depth are α≠β, but the plowing depth b is b=a.

(G) Effects of the Invention As described above, the present invention provides a tilling device 4 in which a cover angle detector 10 is attached to the rear cover 8 that covers the rotary, and the plowing depth is adjusted based on a detection signal from the cover angle detector 10. An attitude detector 13 is attached, and the attitude detector 13 and the cover angle detector 10 are connected to a correction circuit 14 of the plowing depth control circuit,
The detection value of the cover angle detector 10 is transmitted to the attitude detector 13.
This correction value and the plowing depth setting device 15 are corrected using the detected value.
Since the structure is configured to adjust the plowing depth by comparing the plowing depth with the set value of The posture detector 13 detects a change in the posture of the device 4, and the detected value of the cover angle detector 10 is corrected based on this detected value, so that the tilling depth is always automatically set to the predetermined tilling depth set by the tilling depth setting device 15. The plowing depth can be adjusted to a predetermined plowing depth with high efficiency and extremely easily, without having to manually adjust the plowing depth, which is troublesome and uncertain as in the conventional method.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention,
FIG. 1 is a side view of a tilling device attached to the rear of a tractor, FIG. 2 is a control circuit diagram, FIG. 3 is a diagram for adjusting the plowing depth, and FIG. 4 is a side view of a target example. 1... Rear wheel of tractor, 4... Tilling device, 5...
...Lift arm, 7...Rotary cover, 8...
Rear cover, 10...Cover angle detector, 13...
...Position detector, 14...Correction circuit, 15...Plowing depth setting device, 16...Comparator.

Claims (1)

[Claims] 1 In a tilling device 4 in which a cover angle detector 10 is attached to a rear cover 8 that covers the rotary and the plowing depth is adjusted based on a detection signal from the cover angle detector 10, an attitude detector 13 is attached to the tiller device 4, and the attitude detector 13 and the cover angle detector 10 are connected to the correction circuit 14 of the plowing depth control circuit, and the cover angle detector 1
Correct the detected value of 0 with the detected value of the attitude detector 13,
A plowing depth control device for a tillage device, characterized in that the plowing depth is adjusted by comparing this correction value with a set value of a plowing depth setting device 15.