JPS63203A - Plowing depth control system 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] Industrial applications The present invention relates to a tillage depth control method for a tractor.

Conventional technology While raising and lowering the tilling device attached to the tractor.

When tilling, this tilling device is lowered to the working position.

During non-tillage work, the switch is performed by raising the soil above the soil surface, but when descending from this non-tillage work to the working position,
By slowing down the descending speed before the tilling device touches the soil surface, the tilling device is controlled so as not to be subjected to sudden loads.

Problems to be Solved by the Invention In this lowering control mode in which the tilling device is lowered and the descending speed is controlled to decelerate just before it starts tilling work, the tilling device lowers the soil surface to be tilled. It takes too much time even if the descending control continues even when the descending control ends, or conversely, when the tilling device reaches the soil and tilling is performed.

Means for Solving the Problems This invention uses a depth sensor (2) that detects the tilling depth by vertical movement of the tilling device (1) in contact with the tilled soil surface by the tilling bag [(1). In plowing depth control that maintains a constant plowing depth by raising and lowering the tiller (1) relative to the tractor body (3), when the tiller (1) is lowered from a non-working height to a working position, the soil surface When descending control is started to reduce the descending speed from a position approaching , after a certain period of time has elapsed.

The tilling depth control system for a tractor is characterized in that the depth sensor (2) detects the set position to stop the descending control and perform the tilling depth control.

Effect of invention.

When changing the tilling device fil from the non-tillage working position raised relative to the vehicle body (3) to this tilling working position, lower the tilling device (1) to the working position reaching into the soil by operating the lift lever etc. . While the tilling device (1) is lowered to the fixed position, it is lowered at a relatively high speed, but when it reaches a certain position on the soil surface, it is decelerated, and from this point on, it is lowered for a certain period of time under lowering control. Reach tilling position. When this certain period of time has elapsed, the descending control is stopped, and the depth sensor (2) is activated to control the plowing depth by the tilling device (1) to be maintained at a constant depth below the soil surface.

Effects of the Invention As described above, when the tilling device (1) reaches a certain position with respect to the tractor body (3), the descending speed is reduced, and after descending control, it is lowered for a certain period of time to take the soil tilling position. After this fixed period of time has elapsed, plowing depth control is performed by the depth sensor (2) and the reduction control is stopped. Therefore, the process of reduction control is not uniform over a certain period of time. This can cause problems such as irregularities in the soil surface, vertical swings of tillage equipment, etc.
Automatic switching from descending reduction control to plowing depth control is quickly performed regardless of the ground detection state of the sensor, etc., and each control can be stabilized.

Embodiment When rotating, the tractor body (3) is equipped with an engine (4) at the front, a front axle (6) that is steered by a steering handle (5), and a front axle (6) at the rear.

A rear wheel (7) and a power take-off shaft (8) are provided, through which power is transmitted from the engine (4) via a transmission device in the vehicle body (3), and a driver's seat (9) is provided in the upper part. (
9) A lift arm (1) that is moved up and down by a hydraulic system is provided on the rear side.A lift lever (1) is provided on the side of the cockpit (9) to move the lift. arm(
The structure is such that it can be operated to move up and down the l[1, and
The tilling depth setting dial (circle) is provided so that the reference depth for automatic control of the tilling depth of the tilling device (1) using the depth sensor (2) can be set.

The hydraulic circuit of the lift arm (1ω) is provided with a closed solenoid valve +13 (14), and a negative solenoid valve (
13) sends hydraulic pressure to the hydraulic cylinder and lifts the lift arm (
The other electromagnetic valve (141 is for discharging the hydraulic pressure of the hydraulic cylinder and rotating the lift arm (101) downward.

At the rear of the tractor body (3), the lift arm (10
A tilling device (1) is connected to a link machine WflSl that is raised and lowered by a power extraction shaft (8). The tilling device fil is configured to transmit and rotate a horizontal tilling shaft (1) 19.

This tilling shaft (161) is equipped with a tilling claw (1 claw), and a tilling cover (18) that covers the upper part of the tilling device (1) is provided with a leveling plate (one that can be moved vertically) on the rear side of the tilling device (1). The structure allows the surface to be leveled with a leveling plate (19).

The depth sensor (2) can detect the plowing depth based on the vertical movement angle of this leveling plate (191), and the plowing depth control device (a) detects the plowing depth when the depth sensor (2) detects the plowing depth. , While comparing the plowing depth setting dial (1) with the standard plowing depth setting, if the detected value by the depth sensor (2) is too deep than the plowing depth setting, turn the lift arm (1ω upwards). On the other hand, if the plowing depth is too shallow, the lift arm (1ω) can be rotated downward to maintain and control the plowing depth at the set depth.

A lift arm (height sensor 121 that detects the vertical movement angle of 101) is provided, for example, by a limit switch, potentiometer, etc., and maintains the non-tilling height position of the tilling device [1] at a preset position. A height control device @(2δ) is provided to control the height.

In the process of lowering the tilling device (1) by operating the lift lever (1)), the height sensor Q1) lowers the vehicle body (
3), it is lowered at high speed until it reaches a certain height, and when it reaches this certain height, the lowering control device operates to reduce the lowering speed of the lift arm (1ω), and the timer R241 causes the lowering speed to decrease for a certain period of time. The descending control is performed for a certain period of time, and the descending control is stopped after a certain period of time has elapsed.
) and tillage depth control device a! This configuration switches to plowing depth control using O. In addition, in the hydraulic circuit of the hydraulic cylinder that lowers the lift arm (Iω), the lowering side electromagnetic valve α4 is provided with an oil drain valve whose opening is smaller than that of the electromagnetic valve [141]. , this oil drain valve is actuated by the detection of height sensor G! It is best to provide it in a relationship that reduces the speed.

When the tilling device (1) is moved up by the lift arm (1 [upward movement) and moves to tilling work, operate the lift lever (1) with the tilling claw ((7) in the rotational transmission state). When the solenoid valve 04) on the descending side is opened, the lift arm (Ill) is moved down and the tilling device (1) is lowered at high speed until it reaches near the soil surface.Height sensor c!1)
When this lift arm (1) detects the downward movement angle and detects a certain position, the lowering control device (1) operates, and at the same time, the timer 241 performs this lowering control for a certain period of time.
The tilling device (1) is lowered at a reduced speed, touches the soil surface, and performs tilling action by rotating the tilling claws (171).

When a certain period of time set by this timer 24 has elapsed.

The lowering control is stopped, and the tilling depth control by the tilling depth control device 120 is started, and the lift arm (1ω is operated up and down by the tilling depth detection by the depth sensor (2),
The plowing depth is maintained at the plowing depth set by the plowing depth setting dial.

When raising the tilling device fil by operating the lift lever (1υ), the solenoid valve (131) on the lifting side is opened, and the lift arm (101) moves upward at high speed by hydraulic pressure, lifting the tilling device (1). to reach the non-till height position.At this time, when operating the height control device QB, the height sensor C21
) to maintain the preset height while detecting the height.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, with FIG. 1 being a side view and FIG. 2 being a block circuit diagram. In the figure, code (1) is the tilling device, (2) is the depth sensor, (
3) is a vehicle body, 12[) is a plowing depth control device, 21) is a height sensor, is a descending control device, and 124) is a timer.

Claims (1)

[Claims] Cultivation by the tillage device (1) The tillage device (1) is in contact with the soil surface.
plowing depth control in which the plowing depth is maintained constant by raising and lowering the tilling device (1) relative to the tractor body (3) using a depth sensor (2) that detects the plowing depth by vertical movement relative to the tractor body (3). When descending from the non-working height of the tilling device (1) to the working position, if the descending speed is reduced from a position close to the soil surface, the descending speed will be reduced. A tillage depth control system for a tractor, characterized in that the plowing depth control is performed by stopping this lowering control and performing plowing depth control by detecting a setting position of a plowing sensor (2).