JPH0636645Y2 - Rotary depth control device for rotary tiller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a tilling depth control device for a rotary tiller connected to a rear portion of a power vehicle such as a tractor.

[Prior art]

Conventionally, as a control device of this type, a rear cover is pivotally supported at a rear end portion of a main cover that covers an upper part of a tillage part, and a detector for detecting a rotation angle of the rear cover with respect to the main cover is provided above the main cover. The rotary tiller was moved up and down at the rear of the tractor so that the contact angle of the rear cover was always the value set by the tiller depth setting device.

In this case, when the angle of the rotary cultivator to the main unit changes, the rotary cultivator tilts forward or, conversely, tilts backward to cause a subtle change in the working depth itself, especially the special 3P type link mechanism. This tendency is remarkable in the case where the rotary cultivator is connected via the main cover.Therefore, in the conventional device, the main cover that covers the upper part of the cultivating part during the work has a substantially constant angle. There was a device that rotates itself around the tilling axis and at the same time controls the rotation angle of the rear cover.

[Problems to be solved by the invention]

By the way, in the above-mentioned conventional device, when the hydraulic lever is operated to raise the rotary cultivator at the edge of the ridge, the lift arm of the tractor is rotated upward, and at this time, the rotation angles of the main cover and the rear cover are controlled. If it is done, the main cover will be rotated to the rear greatly, and when the turning is finished and the rotary is landed again, automatic control will be performed until the main cover is returned to the original position. Therefore, there is a drawback in that unnecessary control is performed until the main cover is returned to the control state before lifting the working machine.

[Means for solving problems]

The present invention is proposed in view of the above-mentioned problems, and therefore, the following technical means have been taken.

That is, the lift arms 5 and 5 are rotatably and pivotally attached to the rear part of the body of the tractor 1, and the rotary bases of the lift arms 5 and 5 are provided with the ground height of the rotary tiller 12 connected thereto. A position detector 28 for detecting is provided, on the other hand, the rotary cultivating device 12 covers the upper part of the cultivating part, and a main cover 15 that rotates around the axis of the cultivating shaft, and an actuator 26 that rotates the main cover 15. A detector 27 that detects the amount of rotation of the main cover 15 and a rotation angle detector 30 that detects the inclination angle of the rear cover 16 pivotally attached to the rear portion of the main cover 15 to the ground are provided, and are set by the working depth setting device 31. The set value and the tilling depth detection value by the rotation angle detector 30 is for vertically controlling the rotary tilling device 12 so that the detection result of the position detector 28 and the rotation amount detector 27. Front and rear to maintain the main cover 15 at the specified angle to the machine. In a rotary tiller that is controlled to rotate in a direction, the rotary tiller is configured to be switchable between a control state in which the main cover 15 is rotated and a state in which the rotation of the main cover 15 is stopped.
The structure of a rotary tiller characterized by being interlocked with twelve artificial lifting operations.

[Example and its action]

An embodiment of the present invention will be described below with reference to the drawings.

First of all, the tractor 1 has front wheels 2, 2 and rear wheels 3, 3 and the lift arms 5, 5 are rotatable on both left and right sides of a hydraulic cylinder case 4 at the rear of the machine body. The lift arms 5 and 5 pivot in the vertical direction by controlling the supply and discharge of hydraulic oil to and from the hydraulic cylinder 6 in the hydraulic cylinder case 4. 9 and 9 are lower links, and 10 is a top link. The lower links 9 and 9 and the top link 10 constitute a three-point link mechanism 11, and a side drive type rotary tiller 12 is movably connected to the rear end of the three-point link mechanism 11. .

The rotary tiller 12 comprises a plurality of tillage claws 14 planted on a tiller shaft 13, a main cover 15 covering an upper part of the tiller,
A rear cover 16 pivotally attached to the rear end of the main cover 5, an input shaft 19 axially mounted on the front of a gear case 18 to receive rotational power from the PTO shaft 17 of the tractor 1, and the input shaft 19 Rotary tiller for transmitting rotation to tiller shaft 13
It has a chain case 20 and the like provided on the side of 12, and the main cover 15 is formed integrally with a side cover 21 that covers the side of the tillage part, and is arranged above the main cover 15 in the front-back direction. The main frames 22, 22 are firmly fixed.

The main cover 15 is supported rotatably back and forth about the axis of the tilling shaft 13. A horizontal frame (not shown) that connects the pair of left and right main frames 22, 22 to each other at their rear ends.
And a return-acting hydraulic cylinder 26 is interposed between the plates 25 and 25 fixed to the upper part of the gear case 18,
When this is expanded and contracted, the main cover 15 rotates around the axis of the tilling shaft 13. A stroke sensor 27 that detects the amount of expansion and contraction of the hydraulic cylinder 26 is arranged in parallel.

Further, a rotation angle detection sensor 28 for detecting the rotation amount of the lift arms 5 and 5 is provided on one side of the rotation base thereof, and during the descending ground contact of the rotary tiller 12 according to a command from a control circuit which will be described later. The main cover 15 is configured so that its ground posture is maintained at a fixed posture. More specifically, when the lift arms 5 and 5 rotate upward during work, the hydraulic cylinder 26 is extended in accordance with the amount of displacement of the rotational angle, so that the main cover 15 maintains a predetermined angle with respect to the main body. On the contrary, when the lift arms 5 and 5 are lowered, the hydraulic cylinder 26 is shortened accordingly and the main cover 15 is rotated counterclockwise to maintain the desired posture. An angle sensor 30 for detecting the rotation angle of the rear cover 16 with respect to the main cover 15 is provided at the upper rear end of the main cover 15, and the set value by the plowing depth setting device 31 provided near the cockpit and this The working depth is controlled so that the detection value of the angle sensor 30 matches.

Next, the hydraulic circuit of FIG. 3 will be briefly described. Reference numeral 32 denotes a valve for controlling the hydraulic cylinder 26, which is a main cover.
The hydraulic oil sent from the hydraulic pump 35 flows into the valve 32 via the flow dividing valve 36, and the hydraulic cylinder 26 is operated by switching the valve 32. Enter one of the rooms,
The main cover 15 is raised or lowered. Reference numerals 37 and 38 are a solenoid valve for rising and a solenoid valve for lowering for controlling the supply and discharge of hydraulic oil to and from the hydraulic cylinder 6 which constitutes the hydraulic lifting mechanism. When one of the valves 37 and 38 is selectively switched, hydraulic oil is supplied to and discharged from the hydraulic cylinder 6, and the lift arms 5 and 5 rotate vertically. Reference numeral 39 is a hydraulic tank, which is usually composed of the mission case of the tractor 1.

The hydraulic system described above is controlled by a command from the control device 40 shown in FIG. 4, and is controlled by a controller composed of electronic components such as a microprocessor. In the figure, 41 is a switch for forcibly raising and lowering the working machine connected to the rear part of the tractor 1. By operating this switch 41,
The work implement descends to the set maximum raised position or maximum lowered position. A position setter 42 determines the height above ground of the rotary tiller 12 connected to the rear part of the tractor by a dial type or lever type setting device. Reference numeral 44 is a setting device that sets the angle of the main cover 15 with respect to the main unit, is provided near the cockpit, and is configured so that the main cover 15 is maintained in the setting posture set by the setting device 44. . To describe the attitude control of the main cover 15 in more detail, for example, when the lift arms 5 and 5 rotate upward, the displacement angle thereof is obtained by the rotation angle detection sensor 28, and the main cover 15 of the rotary cultivator 12 is determined. Also, since the main cover 15 is rotated to the front side, the main cover 15 is rotated to the rear by an amount necessary to maintain the posture before the change. In this case, the correction value required for expansion / contraction control is incorporated in the control device 40, and the stroke sensor 27 monitors whether or not the correction amount has been reached. In such a control state, when the rotary cultivator 12 is manually raised at the edge of the ridge, the hydraulic operating lever is tilted to the up side, or the compulsory switch 41 is tilted to the up side to rotate the rotary cultivator 12 Hoist.

Then, the control device 40 issues a stop signal to stop the rotation of the main cover 15, and at the same time, a control signal to stop the vertical movement control of the lift arms 5 and 5 by detecting the change in the working depth of the rear cover 16. Be done. Therefore, the main cover 15 is fixed in that position without rotating in the front-rear direction. And
After turning at the edge of the ridge, the worker again turns the rotary tiller.
When 12 is lowered, the main-coverage angle control of the main cover 15 is started, and the plowing depth control of the rear cover 16 is also performed.

In this way, when the rotary tiller 12 is artificially lifted, the main machine angle control of the main cover 15 with respect to the tractor 1, that is, the rotation control of the main cover 15 is stopped, and the rotary tiller 12 is landed. Since the rotation control of the main cover 15 is performed only when performing the plowing work, the front and rear posture of the rotary tilling device 12 connected to the tractor 1 should always be maintained at the set posture during the plowing work. And at the same time, the rear cover 16 against the main cover 15
Since the plowing depth control that keeps the angle of is constant is also performed, the plowing depth is kept constant during the work, and stable automatic plowing depth control is possible, and this control is automatically performed when the rotary tiller 12 is not in operation. Since it is stopped at this time, the problem that the rotary tiller 12 moves inadvertently before starting the working depth control is eliminated.

[Effect of device]

Since the present invention is configured as described above, the rotation of the main cover 15 of the rotary tiller 12 is performed only when the rotary tiller 12 is in the lowered working state, and the rotary tiller 12 is artificially moved. It is not carried out when the work is suspended.

Therefore, the main cover 15 is fixed at that position when the aircraft is turned at the edge of the ridge, and the main cover 15 is turned at the time of turning.
The rotary tiller does not move unintentionally and turns after turning.
When 12 is lowered, it is possible to quickly return to the original working depth area, and it is possible to obtain stable automatic working depth control without control delay.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is an overall side view, FIG. 2 is a partially cutaway rear view, and FIG. 3 is a hydraulic circuit diagram.
FIG. 4 is a control circuit diagram. Explanation of code 1 …… Tractor 5, 5 …… Lift arm 11 …… Rotary tiller 15 …… Main cover 16 …… Rear cover

Claims (1)

[Scope of utility model registration request] 1. Lifting arms 5, 5 are rotatably pivoted to the rear part of the body of a tractor 1, and the rotary bases of the lifting arms 5, 5 are connected to the ground of a rotary tiller 12 connected thereto. A position detector 28 for detecting the height is provided. On the other hand, the rotary tilling device 12 covers the upper part of the tilling part, and a main cover 15 which rotates about the axis of the tilling shaft, and an actuator which rotates the main cover 15. 26, a detector 27 for detecting the amount of rotation of the main cover 15, and a rotation angle detector 30 for detecting the inclination angle of the rear cover 16 pivotally attached to the rear portion of the main cover 15 to the ground. A rotary tiller 12 is controlled to move up and down so that the set value set at 31 and the tilling depth detection value obtained by the rotation angle detector 30 match. The position detector 28 and the rotation amount detector The main cover 15 should be maintained at the specified angle to the unit based on the detection results of 27. In a rotary tiller that is controlled to rotate in the front-rear direction, it is configured to be switchable between a control state in which the main cover 15 is rotated and a state in which the rotation of the main cover 15 is stopped, and the switching is performed in the rotary tiller. A rotary tiller, characterized in that it is interlocked with an artificial lifting operation of the device 12.