JPH0440963B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a rotary tilling device that is attached to the rear of an agricultural tractor for cultivating soil. This invention relates to a two-shaft rotary tiller in which two of the following are arranged in parallel at front and rear positions.

This is a device for creating a seed bed in one step, especially when sowing soybeans, wheat, and other horticultural crops in garden greenhouses or after paddy fields.

(b) Prior Art The technology related to a two-shaft rotary tiller has been known for some time. For example, Akira Jitsukai
This is similar to the technique described in Japanese Patent No. 56-117607.

Since the two-shaft type rotary tiller has two tilling claw shafts arranged in parallel in the front and rear, the finish after tilling is worse than that of the single-shaft rotary tiller.

(C) Problems to be Solved by the Invention The present invention is constructed to solve the above-mentioned conventional problems.
A tilt detection device in the front and back direction is installed to ensure that the horizontal positions of the rough tilling claws and the tilling claws for fine soil are always constant, and the biaxial rotary tiller itself is always in contact with the ground at a predetermined angle. The structure is designed to plow and crush the soil.

(d) Means for solving the problems In order to solve the above problems, the present invention is constructed as follows.

In a two-shaft rotary tilling device in which a tilling claw shaft for rough-raising and a tilling claw shaft for fine soil are arranged in parallel in the front and back in a direction perpendicular to the direction of travel, a tilt detection device 18 in the front-rear direction is mounted on the rotary tilling device. is installed, and based on the signal from the inclination detection device 18, the fine soil is moved relative to the rough tilling claw shaft 3 in order to keep the horizontal positional relationship between the rough tilling claws and the fine soil tilling claws always constant. The tilling claw shaft 4 is configured to move up and down.

(E) Embodiments The objects of the present invention are as described above, and the detailed structure of the present invention will be explained based on the structure of the embodiments shown in the attached drawings.

FIG. 1 is a side view of a two-shaft rotary tiller according to the present invention. Figure 2 is also a rear view. Figure 3 is a drawing showing the power transmission system. FIG. 4 is a control block diagram.

Power is transmitted from the rear PTO shaft 35 of the agricultural tractor A to the input shaft 14 of the rotary gearbox 13 via a universal joint.
Main beams 29L and 29R protrude left and right from the rotary gearbox 13, and a power transmission case 5 and an output gearbox 6 are disposed at the end of the left main beam 29L, along with a left side plate 21L. .

A side frame 31 is fixed to the right end of the right main beam 29R together with the right side plate 21R. A tilling claw shaft 3 for rough raising is interposed between the power transmission case 5 and the side frame 31.

A rough tilling claw 1 is planted on the rough tilling claw shaft 3. Further, the fine soil tilling claw shaft 4 in the input bevel gear box 8 is driven by the output gear box 6 via the universal joint shaft 7. Tilling claw shaft 4 for fine soil has side cover 22L/2
It is supported by a bearing between 2R.

A tilling cover 2 is placed on the rotation trajectory of the tilling claw 1 for rough raising.
0 is fixedly installed, and a thin soil tilling cover 25 is pivotally supported at the rear end of the tilling cover 20 by a pivot shaft 23. The side covers 22L and 22R are fixedly installed on the left and right sides of the thin soil tilling cover 25, or are attached to the side plates 21.
It is permanently installed at L/21R.

The side plates 21L and 21R are in close contact with the fine soil cultivation cover 25 to prevent the generation of scattered soil. The rear cover 9 is pivotally supported at the rear end of the thin soil cultivation cover 25 by a pivot shaft 36, and since a spring is installed in the hanger rod 10, the rear cover 9 moves up and down within the range of this spring. . The main part of the present invention resides in the inclination detection device 18 provided on the top surface of the fine soil tilling cover 25.

In this embodiment, the inclination detection device 18 integrally includes a left-right inclination detection device and a front-rear inclination detection device, but it is not limited to this configuration.
It may be a separate body.

Even in that case, the longitudinal inclination detection device must be provided on the upper surface of the thin soil tilling cover 25 that constitutes the rotary tilling device.

A longitudinal tilting actuator 17 is interposed between the depth frame 15 and the thin soil tilling cover 25, and the lift link 27 of the agricultural tractor A
Left and right tilting actuators 28L and 28R are interposed in either or both of L and 27R.

The actuator may be any type as long as it can be expanded and contracted using a hydraulic, pneumatic, or electric actuator. 16
is the fat handle, 19 is the depth bar, 12 is the depth control wire, 11 is the rear cover 9
This is a sensor rod that senses the rotation angle and transmits it as a sensor signal to the automatic depth control device.

That is, a left-right inclination detection device and a front-rear inclination detection device are provided on the thin soil cultivation cover 25, and the lift arm 3
7L/37R lift link 27L/27R,
Left and right tilting actuators 28L and 28R are interposed, and furthermore, a front and rear tilting actuator 17 is interposed between the thin soil cultivation cover 25 and the depth frame 15.

In FIG. 4, a control block diagram is shown. The tilt detection device is the left and right tilt detection device 18a.
There are two types: and a longitudinal inclination detection device 18b.
Va and Vb are respective hydraulic valve devices.

(f) Function of the invention The structure of the present invention is as described above, and the function will be explained next.
When the left and right tilt detection device on the rotary tiller detects the tilt of the rotary tiller and sends a signal to the controller, the lift links 27L and 27R
The left-right tilt actuator installed in the left-right tilt actuator expands and contracts, and automatic control is performed so that the left-right tilt detection device is always horizontal or at a predetermined angle.

However, with only this automatic control of left and right tilting, the horizontal position of the front and back of the long two-axis rotary tilling device collapses, resulting in rough upheaval and only the tiller claw 1 going deep.
On the contrary, only the tilling claws 2 for fine soil penetrate deeply. Depth control using the lift arm controls the vertical position of the tilling claws for rough raising, but
It is not possible to control the position of the tiller claws for fine soil when the tractor itself tilts back and forth.

The present invention detects this using a longitudinal inclination detection device and expands and contracts the actuator 17 to maintain a constant positional relationship between the rough tilling claw shaft 3 and the fine soil tilling claw shaft 4.

(G) Effects of the Invention Since the present invention is configured as described above, it has the following effects.

First, the rotary tillage device is equipped with a front-back inclination detection device, so that the horizontal position or predetermined angle of the tilling claws for rough tilling and the tilling claws for fine soil are always constant. Because the fine soil tilling claw shaft was moved up and down relative to the claw shaft, the agricultural tractor could run over undulations or irregularities in devices where the front and rear claw shafts are far apart, such as a two-shaft rotary tiller. It is possible to detect changes in the position of the front and rear axes that occur during the process and immediately return the vehicle to its original position. Therefore, the biaxial rotary tiller can always till fine soil in a horizontal state back and forth.

As a result, the finished seed bed is always a horizontal or angled seed bed filled with fine soil.

Second, the rough tilling claw shaft 3, which is supported by the work equipment attachment device on the agricultural tractor A side and moves up and down for automatic tillage depth control, is difficult to move up and down for horizontal adjustment. The invention has a structure in which the tilling claw shaft 4 for fine soil is moved up and down instead of raising and lowering the tilling claw shaft 3 for horizontal adjustment, so it has a simple structure.
This makes it possible to horizontally adjust the front and back of the two-shaft rotary tiller.

[Brief explanation of drawings]

FIG. 1 is a side view of a two-shaft rotary tiller according to the present invention. Figure 2 is also a rear view. Figure 3 is a drawing showing the power transmission system. FIG. 4 is a control block diagram. A... Agricultural tractor, 1... Tilling claw for rough raising, 2
... Tilling claw for fine soil, 3... Tilling claw shaft for roughing, 4... Tilling claw shaft for fine soil, 17... Actuator for longitudinal inclination, 18... Left/right/front/back inclination detection device, 28L・2
8R…Left and right tilt actuator.

Claims (1)

[Claims] 1 In a two-shaft rotary tilling device in which a tilling claw shaft for rough-raising and a tilling claw shaft for fine soil are arranged in parallel in the front and back in a direction perpendicular to the direction of travel, a tilt detection device in the front-rear direction is installed on the rotary tilling device. 18,
Based on the signal from the inclination detection device 18, in order to keep the horizontal positional relationship between the rough tilling claws and the fine soil tilling claws constant, the fine soil tilling claw shaft is adjusted relative to the rough tilling claw shaft 3. 4. A two-axis rotary tiller, characterized in that it is configured to move up and down.