JPH08317710A - Plowing depth control unit in farm working machine - Google Patents

Abstract

PURPOSE: To provide a plowing depth control unit in a farm working machine designed to positively drive tail wheels with the interval between them narrowed, thus seldom causing the tail wheels to run on soil blocks, subject to no missensing, and enabling plowing depth to be detected in response to the vertically moving operation of the tail wheels. CONSTITUTION: The interval between tail wheels 21 is narrowed and these wheels 21 are positively driven, and plowing depth is detected in response to the vertically moving operation of the tail wheels 21, thus controlling plowing depth. It is preferable that the tail wheels 21 be suspended from a tail wheel frame 20, supported by suspending rods 27 and driven by an electric or hydraulic motor 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilling depth control device for an agricultural working machine in which a hydraulic lift is provided at a rear portion of a machine body and a tilling working machine is connected to the hydraulic lift so as to be vertically movable.

[0002]

2. Description of the Related Art Conventionally, in a tractor, a hydraulic lift is provided at a rear part of a machine body, and the tilling implement is connected to the hydraulic lift so as to be able to move up and down. Technology to feed back the displacement amount of the grounding body (sensor) that swings up and down by contact with the machine mechanically or electrically through wires etc. and switch the hydraulic switching valve of the hydraulic lift to maintain a constant working depth was there.

[0003]

A tail wheel or a rear cover is used as a grounding body in the above-mentioned tillage depth control, but the tail wheel sensing is different from the rear cover sensing in that the surface of the cultivated soil mass is stroked. However, if the tail wheel rides on a large lump of soil, it will sense it and change the working depth. Therefore, it is an object of the present invention to provide a tilling depth control device for an agricultural work machine that does not erroneously sense even if a tail wheel encounters a lump of soil.

[0004]

In order to achieve the above object, the present invention provides the following tilling depth control device for an agricultural working machine. That is, in the tilling depth control device in the agricultural working machine that detects the tilling depth and controls the tilling depth according to the raising / lowering operation of the tail wheel, the tail wheel width is narrow and the tail wheel is actively driven. It is a tilling depth control device in an agricultural working machine.

[0005]

By using the driven narrow tail wheel, it is possible to prevent the tail wheel from riding on the soil mass, the false sensing is reduced, and the plowing depth control is facilitated.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments shown in the drawings will be described below. First, a tractor as an agricultural working machine will be described. At the rear of the tractor (1) is a rotary tiller (2)
Is equipped. In FIG. 3, (3) is an engine, (4) is a clutch case, (5) is a mission case, (6) is a front wheel, (7) is a rear wheel shaft, (8) is a rear wheel, and (9) is a PT.
O-axis, (10) is a hydraulic lift equipped with a lift arm (11) and a position control lever (12), (3)
0) is a driver's seat, and (31) is a steering wheel. Further, a tilling implement (2) is attached to the rear side of the tractor (1) via the top link (13) and the lower link (14) which is a towing link so as to be vertically movable. The front end of the top link (13) is connected and supported to the rear side of the hydraulic lift (10) via a top link hinge (15). The upper end of the lift rod (16) is connected to the lift arm (11) provided in the hydraulic lift (10). The lower end of the lift rod (16) is connected to the lower link (14). Therefore, by controlling the hydraulic lift (10) via the hydraulic pressure switching valve, the lower link (14) is moved up and down via the lift arm (11) and the lift rod (16), so that the tiller implement (2) is moved. It can be raised and lowered.

Reference numeral (17) is a machine body of the tilling implement (2), which is attached to the top link (13) and the lower link (14) to move up and down. The airframe (17) has a chain case (1
8) is provided to drive the rotary (19). or,
The tail wheel (21) is attached to the body (1
It is attached to 7) so as to be able to move up and down, and (22) is a tail wheel adjusting handle.

As described above, in the tractor, the hydraulic lift (10) is provided at the rear of the machine body, and the hydraulic lift (1
The tilling implement (2) is connected to 0) so that the tilling depth is sensed by the tilling depth sensor (23) shown in FIG. 2 provided in the machine body (17). The arm (24) of the tilling depth sensor (23) is connected to the stay (25) on the upper surface of the tail wheel arm (20) via a wire (26). Therefore, the rocking of the tail wheel frame (20) with respect to the machine body (17) due to the raising and lowering of the tail wheel (21) is detected by the tilling depth sensor (23), and the hydraulic switching valve of the hydraulic lift is switched based on this detection. It is designed to maintain a constant working depth.

In the tilling depth control by tail wheel sensing as described above, the tail wheel sometimes rides on the soil mass, and when it climbs on the soil mass, the tilling depth may be erroneously sensed. Therefore, in the present invention, the width of the tail wheel is narrowed and the tail wheel is positively driven so that the tail wheel does not run on the earth mass. In FIG. 1, reference numerals (21) and (21) denote tail wheels suspended from a tail wheel frame (20), which are supported by suspension rods (27) and (27). Tail wheel (21) (2
1) is narrowly configured and has an electric motor or a hydraulic motor (2
8) Driven by (28). In the figure (2
9) shows a power cord in the case of an electric motor. Further, the tail wheel shown in the figure has a tooth profile.

According to the present invention, even if the tail wheel encounters a large clod due to the narrow tail wheel driven as described above, the clod is less likely to ride on the clod, and thus false sensing is less likely to occur, thereby controlling the working depth. It will be easier. And, unlike the normal tail wheel, the drive tail wheel has a small supporting load only by sensing the position.

[0011]

Since the normal tail wheel is not narrow, the tail wheel may ride on a large lump of soil, thus mis-sensing the working depth and changing the working depth. According to the present invention, the tail wheel is Because it is narrow and actively driven,
The tail wheel rarely rides on the soil mass, and there is no false sensing. Moreover, since a normal tail wheel rotates due to friction with the ground due to traction of a tractor,
Although resistance is added to the tail wheel and the supporting load of the tail wheel is large, since it is driven positively in the present invention, the contact resistance with the ground is small and the supporting load of the tail wheel is small. Since it only needs to detect the position, there are few false sensings.

[Brief description of drawings]

FIG. 1 is a perspective view showing a device of the present invention.

FIG. 2 is an enlarged explanatory diagram of a tail wheel sensing device.

FIG. 3 is a front view showing the tractor.

[Explanation of symbols]

 1 Tractor 2 Tillage implement 10 Hydraulic lift 11 Lift arm 13 Top link 14 Lower link 16 Lift rod 17 Aircraft 20 Tail frame 21 Tail wheel 23 Tillage depth sensor

Claims (1)

[Claims] 1. A tillage depth control device for an agricultural work machine that detects the tilling depth and controls the tilling depth in accordance with the raising / lowering motion of the trailing wheel. A tilling depth control device for an agricultural working machine characterized by being driven.