JPH067003A - Hydraulic pressure change control unit in tractor - Google Patents

Abstract

PURPOSE:To provide the subject control unit designed to simplify plowing depth setting operation at levee border by actuating a lift cylinder through giving priority to the higher set value among the value set by a height setting device and that by a plowing depth setting device. CONSTITUTION:In a working situation where a rotary tilling device has descended, a lift cylinder 8 is actuated through giving priority to the higher set value among the value set by a height setting device I1 and that by a plowing depth setting device I2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic lifting device for lifting and lowering a ground work machine such as a rotary cultivator connected to a tractor, which makes it easy to adjust the working height during cultivating work. The purpose is to provide a device that can work efficiently.

[0002]

2. Description of the Related Art Conventionally, position control means for controlling elevation of a ground work implement to a height set by a height setting device and tillage control for controlling this ground work implement at a working depth set by a tillage depth setting device. A tractor provided with a deep control means is known, and when performing a plowing work using this type of tractor, an operator,
First, lower the ground work implement from the lifting position before work to the height set by the height setting device, then switch the mode switching mechanism to the working depth control side, and set the dial rotation type working depth setting device. It operated appropriately and set the desired plowing depth set value.

[0003]

As described above, in order to lower the ground working machine from the lifting position, the height setting operation by the height setting device must be followed by the working depth setting operation. However, when the hoisting state is once suspended during the working depth control work, there is a troublesome drawback that the working depth setting operation must be performed again. Moreover, in such a conventional device, the working machine cannot be lifted by the position control during the automatic working depth control, and in order to lift the working machine under the automatic working depth control, the control mode is switched to the position control. It had to be troublesome to operate.

[0004]

SUMMARY OF THE INVENTION The present invention is proposed in view of the above problems, and it is an object of the present invention to perform a mixed control of a plowing depth control and a position control so as to simplify a plowing depth setting operation at a ridge. To do. Therefore, the following technical measures were taken. That is, position control means for controlling the hydraulic lifting mechanism so that the height detection value detected by the height sensor S ₁ matches the height setting value set by the height setting device I ₁ , A tractor having a tilling depth control means for controlling the hydraulic lifting mechanism so that the tilling depth set value set by the tiller depth setting device I ₂ matches the tilling depth detection value detected by the tilling depth sensor S ₂ . When the hydraulic lifting mechanism 9 is operated to the down side and the ground work implement 2 is placed in the working state, the set value set by the height setter I ₁ and the working depth setter I ₂ are set. The hydraulic elevating mechanism 9 giving priority to the higher set value
A hydraulic lifting / lowering control device for a tractor, which is provided with a control unit 12 for activating.

[0005]

Embodiments of the present invention will be described below based on the embodiments shown in the drawings. As shown in FIG. 2, the tractor 1
A rotary tiller, which is an example of a ground work machine 2 at the rear part of the work machine 2, is moved to a pair of left and right lift arms 3 and 3, and left and right lower links 5, which swing up and down via left and right lift rods 4, 4.
5 and the work machine connecting link mechanism 7 composed of the top link 6 at the upper center part. The work machine connecting link mechanism 7 lifts and lowers the lift arms 3, 3 by a lift cylinder 8 using hydraulic pressure. The lifting / lowering operation is performed by the hydraulic lifting mechanism 9.

In position control, the hydraulic lifting mechanism 9
The height setting device I ₁ for controlling the elevation of the
The height detected by the height sensor S ₁ which is composed of a volume 11 which is operated by the turning operation of the lift arm 3 and which is composed of a potentiometer connecting the detection shaft to the lift shaft of the lift arm 3. Until the detected value matches the height set value set by the height setter I ₁ by the turning operation of the hydraulic operation lever 10, the control unit 12 constituted by something like a microcomputer. Is for controlling the hydraulic lifting mechanism 9, and a position control means is configured here to turn on or off the ascending solenoid valve 13 or the descending solenoid valve 14 to raise or lower the drive unit 15 or the descending drive unit. 16 is configured to carry out based on the output command of the control unit 12.

The working depth setting device I _{2 for} controlling the lifting and lowering of the hydraulic lifting mechanism 9 in the working depth control is composed of a volume 18 which is operated by rotating the setting dial 17 so that the ground surface can be slidably contacted. The vertical movement of the rear cover 19 pivotally attached to the ground work machine 2 is pivoted to the potentiometer.
Detected by tilling depth sensor S ₂ consisting of data, tilling depth detection value detected by the tilling depth sensor S ₂ is tilling depth setting to be set by tilling depth setting device I ₂ by the rotation operation of the setting dial 17 The control unit 12 controls the on / off operation of the ascending solenoid valve 13 or the descending solenoid valve 14 until the values match. Reference numeral 20 in the drawing is a work mode changeover switch, which is switched to the position side 21 during position control and to the cultivation depth side 22 during tilling depth control. Reference numeral 23 denotes an on / off-type switch which is operated when starting the work, and is pushed once when the ground work implement 2 is lowered to start the work, and the ground work implement 2 is raised again at a ridge or the like to make a non-operation. Press it again when you are in working condition.

During work, the height setting device I ₁ or the working depth setting device I ₂
The position of the ground work machine 2 is designated by, but the control unit 12 is operated so that the higher setting value of the values set by both setting devices always takes precedence. Further, the ground work implement 2 is configured to be raised to the upper limit value set by the turning operation of the upper limit setting device 24 constituted by a volume or the like when the switch 23 is turned off.

Incidentally, the height sensor S ₁ may have a structure for detecting the vertical rotation angle of the lower link 5 or the vertical rotation angle of the top link 6 in addition to the above embodiment, Various ones can be used.

[0010]

As described above, according to the present invention, the hydraulic pressure is adjusted so that the height set value set by the height setter I ₁ matches the height detected value detected by the height sensor S ₁ . A hydraulic control mechanism for controlling the elevation mechanism 9 so that the tilling depth detection value detected by the tilling depth sensor S ₂ matches the tilling depth setting value set by the tilling depth setting device I ₂ . It is a tractor provided with a plowing depth control means for controlling 9, and is set by the height setting device I ₁ when the hydraulic lifting mechanism 9 is operated to the down side and the ground work implement 2 is placed in a working state. And a control unit 12 for operating the hydraulic lifting mechanism 9 by giving priority to the higher one of the set value set by the plowing depth setting device I ₂ and the hydraulic lifting control of the tractor. since a device, for example, cultivating the working plowing the value set by the tilling depth setting device I ₂ as the target value Complete, tilling the extent that ground working machine 2 by the point where rough soil surface near the time ridge setting the value higher than the tilling depth target height setter I ₁ is not overloaded Can be done.

When turning, the hydraulic operation lever
The ground work implement 2 can be lifted upward by operating 10 to the upside and newly setting a set value that exceeds the cultivating depth target value by the cultivating depth setter I ₂ . When after turning lowers the hydraulic operation lever -10 to less than tilling depth setting value by tilling depth setting device I _2, a set value by the height setting device I ₁ high tilling depth setting device I ₂ than the set value by the priority Therefore, the ground work machine 2 does not fall below the plowing depth set value,
The plowing work can be continued again at the original set working depth.

As described above, according to the present invention, it is not necessary to repeat the operation for setting the working depth each time the ground working machine is raised or lowered at the edge of the ridge, so that the operation is simple and the original working depth is accurate and quick. Since it can be returned to, it is possible to perform plowing work efficiently.

[Brief description of drawings]

FIG. 1 is a control circuit diagram.

FIG. 2 is a side view of a tractor.

FIG. 3 is a perspective view of a main part.

[Explanation of symbols]

1 tractor 2 ground work machine 7 work machine connecting link mechanism 9 hydraulic lifting mechanism 12 control unit I ₁ height setting device I _{2 working} depth setting device S ₁ height sensor S _{2 working} depth sensor

Claims (1)

[Claims] 1. A height setting value set by a height setting device,
The position control means for controlling the hydraulic lifting mechanism so that the height detection values detected by the height sensor match, and the working depth set value set by the working depth setting device is detected by the working depth sensor. A tractor equipped with a plowing depth control means for controlling the hydraulic lifting mechanism so that the working depth detection values coincide with each other, and when the hydraulic lifting mechanism is operated to the lower side and the ground work implement is placed in a working state, A tractor provided with a control unit for operating the hydraulic lifting mechanism by giving priority to the higher of the set value set by the height setter and the set value set by the plowing depth setter. Hydraulic lifting control device.