JPH01196205A - Cultivation-controlling apparatus of tractor - Google Patents

Abstract

PURPOSE:To suppress the formation of local deep holes at the end part of tilled ridge, etc., by setting a cultivation sensor for detecting the soli surface in a state to lift a cultivation machine relative to a vehicle at a high speed when the lift-control zone is detected relative to the cultivation control zone. CONSTITUTION:The control motion of a lift-control valve with a cultivation sensor 3 is set up by a low-flow rate hydraulic circuit when the detection is in a cultivation control zone. The lifting and lowering motion of the lift arm 12 is performed at a relatively low speed in this mode. In the detection in lift control zone, the lift control is performed by a high-flow rate hydraulic circuit. The formation of the local deep holes at the end part of tilled ridge, etc., can be suppressed by this mechanism.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a tillage control device for a tractor.

Prior Art and Problems to be Solved by the Invention Regarding a tillage control device that controls the elevation and descent of a tillage device connected to the rear side of a tractor to maintain a constant tillage depth of the soil (Japanese Unexamined Patent Publication No. 62 -253303 Publication), when the tilling device is raised from the tilling control area and transitioning to the raising control area of the non-tillage position, if the rising speed of the tilling device is constant, just before the tilling device escapes upward from the soil surface. The rotating tilling claws tend to dig up the soil and leave holes.

Means for Solving the Problems This invention provides a means for solving the problem by removing the soil surface (2) of the plowed area by the tilling device (1).
) The tillage sensor (3) detecting the tillage control range of the tillage device (1) relative to the vehicle body (4) is set to control the rising speed at high speed based on the detection of the rise control range. This is the configuration of a tillage control device for a tractor.

Functions and Effects of the Invention When performing tilling work by lowering the tilling device (1) relative to the vehicle body (4), when performing tilling control using the tilling sensor (3), the tilling control range of the tilling sensor (3) is In the detection of
When the tilling device (1) rises and becomes shallow, it is lowered to deepen the tilling depth, and conversely, when it becomes too deep, it rises to make the tilling shallower, and the tilling depth is maintained and controlled at a constant level, but until the end of tilling. When the tilling device (1) is once raised and separated from the soil surface by, for example, the tilling depth becomes shallower as the tilling device (1) is raised in the state of tilling rotation.

When the tilling sensor (3) detects this and detects that the tilling control area has reached the raising control area, the tilling device (1) is raised at a higher speed than the lifting speed in the tilling control area.
Reach the no-till position.

In this way, by detecting the tilled soil surface by the tilling sensor (3), the tilling device (1) is raised and lowered at low speed in the tillage control area during tilling, so that the tilled soil surface can be kept flat and the tilled soil can be locally In the ascending control range where the tilling device (1) is raised to the non-tilling position without causing a change in tillage depth, the ascending speed is set higher than the speed in the tilling control range, and the tilling device (1) is raised to a non-tilling position. The formation of deep holes can be reduced.

Embodiment When rotating, the tractor body (4) is equipped with an engine (5) at the front, is provided with a pair of left and right front wheels (7) that are steered by a steering handle (6), and is mounted at the rear. is equipped with a pair of left and right rear wheels (8) and a power take-off shaft (9) which are powered by the engine (5), and above which are moved up and down by the cockpit (IIIm) and hydraulic control device (1). A lift arm (1δ etc.) is provided.

The tillage device (1) has a lift connected to the rear side of the vehicle body (4) by a pair of left and right lower links (131 and a top link (141), and connects the lift arm Ob and the lower link (IJ). Arm (19)
At the bottom, left and right horizontal tilling shafts + IE9 are mounted, and the power take-off shaft (9) is connected to the transmission shaft (17+), input shaft (1), and transmission case (transmission mechanism in one) for transmission rotation. It is the composition.

2+) is a tilling claw arranged around the tilling shaft (19).

A leveling plate Q3 for slidingly contacting and leveling the tilled soil surface (2) is provided on the rear side of the tilling cover 121) that covers the rotational upper circumference of the tilling claw 12G, and is movable up and down. A tillage sensor (3) is provided to detect the rotation angle.

This tilling sensor (3) detects the tilling depth by the tilling claw f2G by the angle of the leveling plate (23) that slides on the tilled soil surface (2), and by this detection, the above-mentioned hydraulic control device (lυ) lift control valve (?3 is outputted to control the vertical movement of the lift arm (lδ.
When set from b) to the shallowest position (c), the tillage depth is controlled to maintain a constant depth as much as possible by moving up and down this tillage control range (a). When the reference depth (d) of the plowing depth is set using the plowing depth adjustment dial 24, the plowing depth is controlled so as to follow the reference depth of the slope. Leveling plate (
When the tillage sensor 2a approaches a vertically hanging state, the tillage sensor 3 detects the angle at this position as a rise control range (e).

This rise control range (E) may be appropriately selected and adjusted using the setting dial 129.

Control interlocking of the lift control valve (to) by the tillage sensor (3) is performed by using a small flow hydraulic circuit to control the lift when detected in the tillage control range (a), and is relatively slow. The lift arm angle is controlled to move up and down.

Further, in the detection in the rise control region (e), a large flow rate hydraulic circuit is used to perform rise control. Furthermore, the lowering control at this time may be similarly performed under a large flow rate of oil pressure, or conversely may be performed under a small flow rate of oil pressure.

Qe is a lift arm angle sensor, which performs feedback control to the hydraulic control table [+lυ] while detecting the vertical movement angle of the lift arm (1). This is used to raise and lower the lift arm (17J). 4 indicates the A/D converter.

When the tilling device (1) is commanded to rise using the lift switch (2), the tilling device (1) is controlled to rise and fall based on the hydraulic flow rate as shown in FIGS. 3 and 4.

[BRIEF DESCRIPTION OF THE DRAWINGS] The figures show one embodiment of the present invention, in which Fig. 1 is a partially cutaway side view, Fig. 2 is a control block diagram, Fig. 3 is an operational diagram of the tillage sensor, and Fig. Figure 4 shows a hydraulic flow rate graph of the hydraulic control device. In the figure, code (1) is the tilling device, (2) is the soil surface, and (3)
indicates the tillage sensor, and (4) indicates the vehicle body.

Claims (1)

[Claims] A tillage sensor (3) that detects the soil surface (2) left by the tillage by the tillage device (1) detects the rising speed by detecting the rise control region of the tillage control region of the tillage device (1) relative to the vehicle body (4). A tillage control device for a tractor, characterized in that the tillage control device is set to control at high speed.