JPH0622608A - Lift-controlling apparatus of tractor - Google Patents

Abstract

PURPOSE:To maintain the original preset value even after the interruption of tilling work by setting the height, tilling depth, etc., of a rotary tiller with an operation tool, storing the value preset by the operation tool in a memory storage means and controlling the tiller with a controller. CONSTITUTION:A rotary tiller is provided with a pair of right and left lift arms 3, 3, which are turned with a lift cylinder 8 and controlled to be a height or a tilling depth preset by an operation lever 10. The value preset by the operation lever is maintained in a memory storage circuit 25 even after stopping an engine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting control device for a ground working machine such as a rotary cultivator connected to a tractor, which has many functions such as height control and tillage depth control. In such a tractor, the ground work machine can be easily and accurately moved up and down to a target position by an operation tool such as an operation lever without any error.

[0002]

2. Description of the Related Art In order to control a ground work machine to a predetermined height or to a predetermined working depth, by operating a height setting tool and a working depth setting tool, which are provided exclusively for each of them. The height setting value and the plowing depth setting value are instructed, and the ground work machine is vertically moved so as to match the height detection value and the plowing depth detection value detected by the height detector and the plowing depth detector.

[0003]

[Problems to be Solved by the Invention] For example, in the vicinity of headland,
The ground work implement is once lifted, the turning operation is performed, and the descending operation is performed again to the original working depth, and the setting operation by the setting lever must be performed again each time the elevating operation is performed. If the setting lever is moved carelessly when the engine is stopped and the work is interrupted, the setting operation must be performed again after the work is started.

[0004]

SUMMARY OF THE INVENTION The present invention is proposed in view of the above problems, and in the case where work is interrupted, the original set value is not changed even if the setting tool is erroneously operated. It is intended to improve operability. Therefore, the following technical measures were taken. That is, the ground work machine connected to the tractor by the work machine connection link mechanism is provided to be movable up and down by the hydraulic lifting mechanism, and the ground work machine is controlled to the height set by the operation tool or the working depth. A lifting control device for a tractor, characterized in that a lifting and holding control device having a configured control unit is provided with a memory holding circuit for holding and holding the set value by the operating tool even after the engine is stopped.

[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.

An operation lever 10 as an operation tool which is rotatably operable is connected to a slider of a setting device I ₁ which is formed by something like a volume, and the operation lever 10 of the operation lever 10 is connected. The voltage set by the operation is input through the A / D converter 11 to the control unit 12 which is configured by a micro computer or the like, and the potentiometer is used to detect the height of the ground work machine 2. menu - was formed by other such things Rifutoa the detection axis of the height sensor S ₁ - attached to arm 3, potentiometer for detecting the Kofuka - plowing formed by data depth sensor S
The detection shaft _{2 is connected to} a detection arm 14 that transmits the movement of the rear cover 13 slidingly contacting the ground surface by a rotational movement, and both the height sensor S ₁ and the working depth sensor S ₂ are connected to the control unit 12.
By setting the work mode selector switch 15 at either the height control position 16 or the working depth control position 17, the set value by the setting device I ₁ is switched to either the height setting value or the working depth setting value. At the same time, the detection value of either the height sensor S ₁ or the working depth sensor S ₂ is actually input to the control unit 12, and the command of the control unit 12 is provided. Alternatively, the ascending solenoid valve 21 is amplified by the descending drive unit 19 to be turned on or off, whereby the pressure oil of the pump 22 is supplied to the lift cylinder 8 to raise the lift arm 3 or the lift cylinder 3 is lifted. The pressure oil 8 is discharged and the lift arm 3 descends.

[0007] The operation mode changeover switch 15 is used to switch between the above-described height control and plowing depth control.
That is, the operation mode switching operation is made effective only when the ground work implement 2 is in a predetermined hoisting state.
Make up 2. Further, as shown in FIG. 3, the operating range of the operating lever 10 is crossed over the neutral position N and the neutral position to the left and right, and the rising position U, the descending position D, and the continuous rising position U are shown.
It is divided into L and the continuous descending position DL. Then, for example, the setting of the working mode is switched to the working depth control side, the ground work implement 2 is lowered to the set value, and then the operation lever is set.
When 10 is moved to the ascending position U and then to the neutral position N, the ascending amount according to the deviation amount from the neutral position N to the ascending position U is added to the currently stored plow depth setting value. It will be stored in the control unit 12 as a new set value,
When the operation lever 10 is moved to the neutral position N next in the lowered position D, the amount of lowering according to the deviation amount from the neutral position N to the lowered position D is added to the set value, and the new amount is reduced by the lowering amount. It is configured to be stored in the control unit 12 as a set value.

Even when the ground work implement 2 is once lifted to the upper limit set value, when the operation lever 10 is operated to the continuous lowering position DL, the ground work implement 2 is lowered to the stored set value at once. By the way, even if the operation lever 10 is returned to the neutral position N during this time, the ground work machine 2 is set to the set value.
Is controlled, and the operation lever 10 is moved to the neutral position N.
Is operated so that the ground work implement 2 is raised to the set upper limit set value when operated.

Reference numeral 25 is a memory holding circuit 25 as a means for holding and storing the plowing depth set value and the height set value even after the engine is stopped. If the memory holding circuit 25 does not exist, the plowing depth setting value and the height setting value must be set again when the power is turned on, but this is not necessary in this example. The means for surely returning the operation lever 10 to the neutral position N is, for example, an oil damper as a return mechanism 24 provided between the operation lever 10 and the tractor body 23 so that the operation lever 10 can be operated from the operation lever 10. When the hand is released, the return mechanism 24 returns to the neutral position N.

When the operation lever 10 is operated to the ascending position for a certain time or more during the continuous lowering operation, the continuous lowering operation is stopped so that the operation lever 10 is kept for a certain time or more during the continuous ascending operation. When the operation lever 10 is operated to the descending position, the continuous raising operation is stopped, and the operation lever 10 is returned from the continuous lowering position DL or the continuous raising position UL to the neutral position N. It is configured to prevent malfunction due to overshooting.

Therefore, the operation lever is used in the tilling work.
If 10 is operated to the continuous lowering position DL and immediately returned to the neutral position N, the ground work machine 2 is lowered to the tilling depth setting value or the height setting value stored in the control unit 12,
After this lowering operation, if the operation lever 10 is moved to, for example, the lowering position D and then returned to the neutral position N, the neutral position N
The descending amount according to the deviation amount from is added to the original plowing depth setting value or the height setting value and is newly stored as the plowing depth setting value or the height setting value, and the ground work machine 2 also has only the descending amount. Further, the descent is controlled.

If the operation lever 10 is moved to the continuous rising position UL and returned to the neutral position N in order to perform a turning operation near the headland, the ground work machine 2 is lifted to the upper limit set value. When the turning operation is performed and then the operation lever 10 is operated to the continuous lowering position DL to return to the neutral position N, the ground working machine 2 is again set to the plowing depth setting value or the height setting value stored in the previous direction. The descent will be controlled.

Further, by operating the working mode changeover switch 15 to either the height control position 16 or the working depth control position 17, it is possible to switch to the height control or the working depth control. Thus, the desired height or working depth can be controlled only by operating the operation lever 10 which is the operation tool, and the lifting operation and the operation position lowering operation can be performed by simple operations. .

The height sensor S ₁ and the working depth sensor S ₂ are not limited to the above-mentioned illustrated examples, but height sensors adapted to detect the elevation angle of the lower link 5 may be used.

[0015]

As described above, according to the present invention, the ground work machine connected to the tractor by the work machine connection link mechanism is provided so as to be vertically movable by the hydraulic lifting mechanism, and the height set by the operation tool or An elevation control device having a control unit configured to control a ground work machine at a plowing depth or the like is provided with a storage holding unit for storing and storing a set value by the operating tool even after the engine is stopped. Therefore, when the engine is stopped and the work is interrupted, the previous setting value is held by the memory holding means even if the operation tool is accidentally moved, so there is no need for a reset operation after the engine is started, Work can be continued and work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a control circuit diagram.

FIG. 2 is a side view of a tractor.

FIG. 3 is an enlarged 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 S ₁ height sensor S _{2 working} depth sensor

Claims (1)

[Claims] 1. A ground work machine connected to a tractor by a work machine connection link mechanism is movably provided by a hydraulic lifting mechanism, and the ground work machine is set at a height set by an operating tool or a working depth. An elevating control apparatus for a tractor, comprising an elevating control apparatus having a control unit configured to control, wherein a storage holding unit for storing and retaining a set value by the operation tool even after the engine is stopped.