JP2001299010A - Controller for tillage depth of tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately measure the tillage depth of a rotary tiller. SOLUTION: This controller for the tillage depth of the rotary tiller is obtained by installing a pressure detecting sensor 20 for detecting the internal pressure of a hydraulic cylinder 13 and a lifting arm angular sensor 18 for detecting the rotation angle at the base of a left and a right lifting arms 9 and 9 and measuring the tillage depth of the rotary tiller 8 from values detected with the pressure detecting sensor 20 and the lifting arm angular sensor 18 in a tractor for lifting and lowering the rotary tiller 8 with the left and right lifting arms 9 and 9 vertically rotating with the hydraulic cylinder 13 at the rear of a car body. A position where the rotary tiller 8 is lowered by lowering rotation of the left and right lifting arms 9 and 9 to contact the ground and the internal pressure of 0 of the hydraulic cylinder 13 is detected with the pressure detecting sensor 20 is taken as the tillage depth of 0 cm. The subsequent lowering movement of the rotary tiller 8 is detected with the lifting arm angular sensor 18 and the tillage depth is calculated from a prescribed calculating formula on the basis of the detected lowering angle. Thereby, the tillage depth control for maintaining the tillage depth at the prescribed value is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a tractor tillage depth control device.

[0002]

2. Description of the Related Art A rotary tilling device is connected to a rear portion of a tractor body so as to be able to move up and down, and a vertical swing angle of a rear cover and the like of the rotary tilling device is detected by a detector such as a potentiometer. It is known that the hydraulic lifting device is operated so that the tillage depth set by the depth setting dial and the tillage depth detected by the detector coincide with each other to control the tillage of the rotary tillage device.

[0003]

When the tilling operation is performed while setting the tilling depth of the rotary tilling device with the tilling depth setting dial using the conventional device, the tractor wheel is buried in the soil due to the hardness of the soil. The ground clearance of the tractor and the rotary tilling device also changes due to the difference, the degree of wear of the wheel lugs, the difference in the tire pressure, and the like.

[0004] Therefore, since the ground height of the rotary tilling device varies depending on the tractor, there is a problem that even if the predetermined tilling depth is set with the cultivation depth setting dial, the tilling operation cannot be performed at the correct tilling depth. Therefore, the present invention is to solve such a problem.

[0005]

The present invention takes the following technical measures in order to solve such problems. That is, the present invention provides a rotary tillage device 8 provided with left and right lift arms 9, 9 which are vertically rotated by a hydraulic cylinder 13 at a rear portion of a vehicle body, and which are vertically moved by the vertically rotated lift arms 9, 9. In the tractor configured to control the tillage depth by raising and lowering the tractor, a pressure detection sensor 20 for detecting the internal pressure of the hydraulic cylinder 13 is provided, and a lift for detecting a rotation angle is provided at the base of the left and right lift arms 9, 9. An arm angle sensor 18 is provided, and the tilling depth of the rotary tilling device 8 is measured from the detection values of the pressure detection sensor 20 and the lift arm angle sensor 18 to control the tilling depth.

[0006]

When the rotary tilling device 8 is operated in the lowered state to allow the oil in the hydraulic cylinder 13 to return to the tank, the left and right lift arms 9, 9 are rotated downward by the own weight of the rotary tilling device 8. The rotary tilling device 8 moves down. When the rotary tilling device 8 comes into contact with the ground and the pressure detection sensor 20 detects zero pressure in the hydraulic cylinder 13, the position is set to a tilling depth of 0 cm, and the subsequent downward movement of the rotary tilling device 8 is set to the lift arm angle. The tillage is detected by the sensor 18, the tillage depth is calculated by a predetermined formula based on the detected descent angle, and the tillage depth control is performed to lower the tillage to the tillage depth set by the tillage depth setting dial 16.

As described above, the tilling depth, which is the reference depth of the rotary tilling device 8, is determined by detecting the internal pressure in the hydraulic cylinder 13, and the tilling depth is determined based on the detection value of the lift arm angle sensor 18 based on this. Since the measurement and the tillage depth control are performed, the tillage depth can be accurately measured even when the ground height of the tractor and the rotary tillage device 8 changes,
The tilling operation can be performed at the exact tilling depth intended by the operator.

[0008]

Embodiments of the present invention shown in the drawings will be described below. As shown in FIGS. 1 and 2, a tractor body 1 has left and right front wheels 2 and 2 and left and right rear wheels 3 and 3 driven by the rotational power of an engine.
A driver's seat 4 is disposed in the middle of the tractor body 1 in the front-rear direction, and a control handle 5 is provided in front of the driver's seat 4.

A rotary tilling device 8 is connected to the rear end of the tractor body 1 via a lifting link mechanism such as a top link 6, a lower link 7, and the like so as to be able to move up and down. And the lower links 7, 7 are connected via rods 10, 10, and transmitted from a power take-out shaft 11 provided at a lower rear portion of the tractor body 1 to a rotary tillage device 8 via a transmission shaft 12.

A control valve 14 for operating a hydraulic cylinder 13 for raising and lowering the rotary tilling device 8 is disposed on the lateral side of the cockpit 4, and the control valve 14 is operated by a lift lever 15 so that the hydraulic cylinder 13 is operated. Pressure oil is supplied and discharged, and the lift arm 9 is configured to rotate up and down.
An operation panel arranged on the lateral side of the cockpit 4 includes a potentiometer, a cultivation depth setting dial 16 for setting a target cultivation depth, and a lift arm 9 with a lift lever 15.
And an up / down switch 17 for raising and lowering to a position set by a tillage setting dial 16 or the like.

A lift arm angle sensor 18 for detecting the elevation angle of the lift arm 9 is provided at the rotation base of the lift arm 9.
A draft sensor 19 that detects the pressure acting on the top link 6 to perform draft control is provided at a connecting portion that connects the top link 6, and a pressure detection sensor 20 that detects an internal pressure is provided at the hydraulic cylinder 13. I have.

A microcomputer (CP) for controlling tillage depth
U) 21 includes a working depth setting dial 16, a lift arm angle sensor 18, a draft sensor 19, and a pressure detection sensor 20.
Through the input interface, and the CPU
21 is connected to a lifting / lowering drive means of the control valve 14 via an output interface.

When cultivating with a tractor while setting the tilling depth of the rotary tilling device 8 with the cultivating depth setting dial 16, the difference in the depth at which the wheels of the tractor are buried in the soil due to the hardness of the soil, and the The ground clearance of the tractor and the rotary tilling device 8 changes depending on the degree of wear of the lugs, the difference in tire air pressure, and the like.

Therefore, since the ground height of the rotary tilling device 8 varies depending on the tractor, there is a problem that even if the tilling depth setting dial 16 is used to set a predetermined tilling depth, the tilling operation cannot be performed with the correct tilling depth. Was. Therefore, in this embodiment, an attempt is made to solve such a problem.

The details of plowing depth control of this embodiment will be described below. When the control valve 14 is operated in the lowered state and the pressure oil in the hydraulic cylinder 13 is returned to the tank,
The lift arm 9 is rotated downward by the own weight of the rotary tilling device 8, and the rotary tilling device 8 is lowered. Then, when the rotary tillage device 8 is in contact with the ground and the pressure detection sensor 20 detects zero internal pressure of the hydraulic cylinder 13, the position is set to a tillage depth of 0 cm. The subsequent lowering state of the rotary tillage device 8 is detected by the lift arm angle sensor 18,
The tillage depth is calculated by a predetermined calculation formula based on the detected descent angle, or the tillage depth is selected and determined from a predetermined table, and the tillage depth control is performed to lower the tillage depth to the tillage depth set by the tillage depth setting dial 16. I do.

As described above, since the cultivation depth is measured and the cultivation depth is controlled, the cultivation depth can be accurately measured even if the ground height between the tractor and the rotary cultivation device 8 changes, and the operator can accurately measure the cultivation depth. It is possible to work at a great tillage depth. In determining the tillage depth is zero, the zero tillage depth point may be corrected based on the hardness of the soil. That is, when the soil is hard, the detection point at which the internal pressure is zero is set to the cultivation depth of zero, and when the soil is soft, the tilling depth is corrected to a point at a predetermined distance above the zero internal pressure detection point.

Next, the following control may be performed using the detection information of the pressure detection sensor 20. A pressure detection sensor 20 for detecting an internal pressure is provided in a hydraulic cylinder 13 that moves up and down the rotary tilling device 8 of the tractor, and when pressure oil is supplied to the hydraulic cylinder 13 and the lift arm 9 is raised, the pressure detection sensor 20 The detected pressure value is compared with the reference pressure value, and when a pressure rise equal to or more than a predetermined value is detected, it is determined that soil or grass has adhered to the rotary tillage device 8 and has become heavier than a predetermined weight. A warning is issued to the effect that soil has adhered to the rotary tillage device 8.

In a small tractor of about 13 to 15 horsepower,
If the tilling work is performed with soil and grass adhered to the rotary tilling device 8, there is a problem that the horsepower is taken by them and the tilling work efficiency is reduced. In this embodiment, when the rotary tilling device 8 is raised at the time of turning during the tilling operation by the tractor, a warning is issued when the rotary tilling device 8 becomes heavier than a predetermined amount, so that it is known that a large amount of soil and grass has adhered. it can.

Next, the arrangement of the tilling claws of the rotary tilling apparatus 8 will be described with reference to FIG. When performing the plane tilling work to make the entire paddy field flat by the rotary tilling device 8, the arrangement of the tilling nails is as shown in FIG. That is, the tilling shaft 2
In the middle part in the left and right direction, the inward tilling claws 23, 23, ...
, And outward tilling claws 24, 24,... Are arranged close to each other while being deviated by 180 degrees in the rotation direction, and the inward tilling nail 23 and the outward tilling nail 24 at the center are the same in the left-right direction. The center tilling claw block 25 is configured so that the positions are tilled. In this embodiment, the tilling shaft 2
In the middle part of 2, five central tillage claw blocks 25, 25,
… Is constituted.

The left and right tilling claw blocks 26 on both left and right sides of the tilling shaft 22 are configured as follows. At the left and right ends of the cultivation shaft 22, residual tillage processing claws 27 that are bent outward are disposed at the outermost positions, and are simultaneously driven inward at predetermined intervals inside the residual tillage processing claws 27. The tilling claws 23, 23 are arranged at a position slightly deviated inward from the arrangement position of the residual cultivation processing claws 27, and 18 in the rotational direction.
The inward tilling claw 23 is arranged at a position deviated by 0 degrees.

Further, when the rotary tilling device 8 tills the whole field in the plane, the tilling work is performed by changing a part of the arrangement of the above-mentioned paddy claw. That is, in the left and right tilling claw blocks 26, the inward tilling claw 23 closest to the center is positioned.
Are changed to the outward tilling claws 24.

With the above-described claw arrangement, it is possible to perform flat tilling with tillable swelling portions 31, 31,... In which cultivated soil is small and swelled in each of the tillage claw blocks in paddy fields and upland fields. it can. In this embodiment, only the mounting holder for the tilling claw, which is changed during paddy field work and field work, is mounted as a well-known one-touch holder 28 with a one-touch bolt 29 with which the cultivating claw can be attached and detached with one touch, and no change is required. The tilling claws are configured such that the tilling claws are attached to ordinary claw holders 30, 30,... With bolts and nuts.

In order to change the arrangement of the tilling nails, the one-touch holder 28 and the one-touch bolt 29
Accordingly, the mounting can be easily changed without using any tools, and a convenient tillage claw mounting device with reduced cost can be provided.

[Brief description of the drawings]

FIG. 1 is a side view of a tractor and a rotary plow.

FIG. 2 is a block diagram.

FIG. 3 is a rear view showing a claw arrangement of the rotary tillage device, and a rear view showing a tillage state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tractor body 2 Front wheel 3 Rear wheel 4 Pilot seat 5 Steering wheel 6 Top link 7 Lower link 8 Rotary tilling device 9 Lift arm 10 Rod 11 Power take-out shaft 12 Transmission shaft 13 Hydraulic cylinder 14 Control valve 15 Lift lever 16 Tillage setting dial 17 Lift switch 18 Lift arm angle sensor 19 Draft sensor 20 Pressure detection sensor 21 Microcomputer

Claims (1)

[Claims] A right and left lift arm, which is vertically rotated by a hydraulic cylinder, is provided at a rear portion of a vehicle body. In a tractor configured to control the tilling depth by raising and lowering, a pressure detection sensor 20 for detecting an internal pressure of the hydraulic cylinder 13 is provided, and a lift for detecting a rotation angle is provided at a base of the left and right lift arms 9, 9. A tractor cultivation depth control device comprising an arm angle sensor, and measuring the cultivation depth of the rotary tilling device 8 from the detection values of the pressure detection sensor 20 and the lift arm angle sensor, and controlling the cultivation depth.