JPS63222601A - Automatic plowing depth control apparatus of tractor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention connects a tilling device that is driven up and down by a lift arm to the rear of a tractor, and includes an auxiliary grounding body that can be driven up and down and raised and lowered to the ground. A sensor is provided for detection, and with the lift arm being able to freely move up and down, the auxiliary grounding body is driven up and down via an actuator based on the detection result of the sensor to bring the height of the tillage device above the ground within a set range. The present invention relates to an automatic plowing depth control device for a tractor configured to maintain the plowing depth.

[Prior art]

As an automatic plowing depth control device for tractors, for example,
As disclosed in Japanese Patent No. 8-7506, it is common to control the lift arm to move up and down to maintain the height of the tilling device within a set range.

However, with this type of tiller, when the tilling depth increases and the lift arm is controlled to rise, if the tilling device digs into the soil strongly, the tilling device will not rise above the ground and the tractor will move relatively. The front of the aircraft tends to tip over, making the aircraft unstable.

In particular, in a four-wheel drive type vehicle, the ground pressure of the front wheels may decrease, resulting in a lack of thrust.

Therefore, as a solution to such problems, for example, as shown in Japanese Utility Model Application Publication No. 58-50609,
A method was proposed in which a tail wheel was installed at the rear of the tiller as an auxiliary grounding body, and the tilling depth was stabilized by controlling the raising and lowering of the tail wheel.

[Problem to be Solved by the Invention 3] The above-mentioned plowing depth control device using a tail wheel prevents the tilling device from unreasonably digging into the soil, and thus prevents the front curling phenomenon of the tractor itself as described above. However, because the tail wheel is installed at the rear of the tilling device,
There was a problem where wheels were left behind in the plowing section.

In addition, since the tail wheel is placed at the rear of the tilling device, the overall length of the aircraft becomes larger, increasing the turning space of the aircraft, and at the same time, it is necessary to prevent the tail wheel from getting caught in the ridge when starting tillage from the edge of the ridge. , unless it is from a place far away from the ridge.
There were some problems that made it impossible to cultivate the land.

The present invention has been made focusing on the above-mentioned circumstances, and
The purpose of this invention is to eliminate the above-mentioned problems when performing plowing depth control using an auxiliary grounding body.

Means for Solving Problem c] That is, the characteristic configuration of the automatic plowing depth control device for a tractor according to the present invention is that an auxiliary grounding body is installed between the tractor and the plowing rotary part, and the emphasis on the lift arm is The lift arm operating mechanism and the control means for the actuator for raising and lowering the auxiliary grounding body are linked to each other so that the auxiliary grounding body is automatically raised relative to the tilling device in conjunction with the lifting operation. The action and effect are as follows.

[For production]

Since the auxiliary grounding body is installed between the tractor and the tilling rotary section, even if the auxiliary grounding body leaves a mark on the field, the field can be tilled by the tilling device afterwards.

In addition, when the lift arm is activated to raise the lift arm, the auxiliary grounding body is automatically raised relative to the tilling device in conjunction with this operation, making it possible to turn the aircraft along the edge of a ridge. When the tiller is raised, the auxiliary grounding body is raised at the same time.

〔Effect of the invention〕

The marks formed by the auxiliary grounding body are erased by the tilling device, which does not impede subsequent work, and it is now possible to till the fields from close to the edge of the ridge. Furthermore, even when turning the aircraft near the edge of a ridge, the lower part of the ground body does not come into contact with the ridge, making it possible to turn without having to raise the tillage device too much.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Figure 1 shows the rear of the tractor (1), and the rear of the tractor (1) has a pair of left and right support arms (1
A rotary tiller (3) is connected to the rotary tiller (3) via the rotary tiller (1) so that it can be raised and lowered freely, and the left and right lift arms (2 ) is provided to be able to swing up and down,
This lift arm (2) and the support arm (11)
The rotary tiller (3) is configured to be able to be raised and lowered by being connected to the rotary tiller (3) via a lift arm (15).

Further, between the tractor (1) and the tilling rotary part (7), the support arm (11) has a double-acting hydraulic cylinder (6), which is an example of an actuator, and a roller (4) as an auxiliary grounding body. ) is provided so that it can be raised and lowered freely by the operation of the wheel (
4), it is possible to change the height of the rotary tiller (3) above the ground, which is in a freely descending state.

The rotary tiller (3) is equipped with a potentiometer (
9) is provided, as well as a rotary tillage device (
3) The tilling cover (1) is installed at the rear of the tiller cover (1
6) and the operating shaft of the potentiometer (9) are interlocked and connected via a link mechanism (17), and the tilling cover (1
6) Oscillation based on the ground reaction force is controlled by the potentiometer (9).
A ground height detection sensor (5) is configured to detect the height above the ground.

Next, the hydraulic lifting operation system of the rotary tiller (3) will be explained in detail. As shown in FIG. 3, the pressure oil from the hydraulic pump (20) is divided by the flow priority pulp (22). After the control I flow is supplied to the 3-position electromagnetic switching control valve (23), it is combined with the surplus flow from the flow priority valve (22), and this combined oil is operated by the operating lever (19). The lift arm (2) is
It is designed to be supplied to a hydraulic cylinder (13) for use.

The rotary tiller (3) can be raised and lowered by operating the control lever (19) to switch the control valve (27) and actuate the hydraulic cylinder (13).

A control valve (27) is provided at the rotation fulcrum of the operating lever (19).
A sensor (25) is provided to detect the switching position of the
When the control lever (19) is operated so that the control valve (27) is switched to the raised position, a signal from the sensor (25) is input to the control circuit (24) and the control circuit (27) is switched to the raised position.
4) issues an operation signal to the control valve (23) to switch the control valve (23) from the neutral position to the contraction side. As a result, pressure oil from the hydraulic pump (20) is sent to the hydraulic cylinder (6), and the hydraulic cylinder (6) is operated to contract. Further, a signal from a limit sensor (28) that detects the shortened state of the hydraulic cylinder (6) is transmitted to the control circuit (2).
4), and when the hydraulic cylinder (6) reaches its shortening limit, the control valve (23) is switched to the neutral position and operated.

In addition, the operating lever (19) is connected to the rotary tilling device (
If you switch to the lowering side of 3) and hold it, the rotary tiller (3) will be lowered by its own weight, and the control circuit (24) will enter automatic tilling depth control mode by the signal from the operating lever sensor (25). Can be switched. In this automatic plowing depth control mode, the detection signal from the ground height detection sensor (5) and the setting signal from the manually adjusted plowing depth setting device (26) are compared, and the detection signal from the sensor (5) is set. The set plowing depth is maintained by raising and lowering the wheel (4) using a hydraulic cylinder (6) so as to be equal to the signal. In other words, during tillage work, the rolling wheels (
4) supports the rotary tillage device (3) and allows automatic control of tillage depth.

Note that the automatic plowing depth control mode is canceled when the operating lever (19) is in the raised position and the neutral position.

[Bessio side]

In the above embodiment, a roller was provided as the auxiliary grounding body (4), but a gutter-like member may be provided instead.

Further, as an actuator for raising and lowering the auxiliary grounding body (4), an actuator that is screw-fed and expanded/contracted by an electric motor can also be used.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the automatic plowing depth control device for a tractor according to the present invention; FIG. 1 is a side view of the main part of the tilling device in the automatic plowing depth control state, and FIG. 2 is a main part of the tilling device in the raised state. The side view and FIG. 3 are control circuit diagrams. (1)...Tractor, (2)...Lift arm, (3)...Pilling device, (4)...
...Auxiliary grounding body, (5) ...Sensor,
(6)...Actuator, (7)...
・Rotary club.

Claims (1)

[Claims] A tilling device (3) that is driven up and down by a lift arm (2) is connected to the rear of the tractor (1), and the tilling device (3) is connected to the rear of the tractor (1).
3) is equipped with an auxiliary grounding body (4) that can be driven up and down and a sensor (5) for detecting the height above the ground, and the lift arm (2)
is able to move up and down freely, the auxiliary grounding body (4) is driven up and down via the actuator (6) based on the detection result of the sensor (5) to set the height of the tillage device (3) above the ground. This is an automatic tilling depth control device for a tractor configured to maintain the plowing depth within a range, in which the auxiliary grounding body (4) is installed between the tractor (1) and the tilling rotary part (7), and the lift arm ( Control of the lift arm operating mechanism and the auxiliary ground body lifting actuator (6) so as to automatically raise the auxiliary ground body (4) relative to the tilling device (3) in conjunction with the emphasized raising operation of 2). An automatic plowing depth control device for a tractor that is linked with means.