JPH0728574B2 - Rotary depth control device for rotary tiller - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tillage depth control device for a rotary tiller which is connected to a power farming machine such as a tractor to cultivate soil.

[0002]

2. Description of the Related Art Conventionally, a tilling depth control device for a rotary tiller is constructed so that a lower edge of a rear cover covering the rear of the tiller is slid on the ground to detect a change in the unevenness of the ground. If the rear cover rotates in the direction that the plowing depth becomes shallow, the hydraulic lifting mechanism is operated downward to lower the entire rotary tiller, and conversely, the rear cover rotates in the direction where the plowing depth becomes deep. Then, the hydraulic lifting mechanism is actuated to the ascending side to raise the entire rotary tiller.

[0003]

[Problems to be Solved by the Invention]

By the way, in such a conventional device, since the fulcrum position of the rear cover is constant without moving in the front-rear direction, the length of the rear cover becomes insufficient when the shallow cover is raised, and the cultivated soil is It tends to scatter backwards, and on the contrary, when deeply raised, the rear cover becomes longer than necessary,
For example, when the ridger is mounted, there is a problem that the ridger and the rear cover interfere with each other.

In addition, in the case of the conventional device, since the surface of the tilled soil is pressed by the lower edge of the rear cover to level it, the tiller section is used when the plowing depth is shallow and when the plowing depth is deep. There is a problem in that the leveling performance is changed due to a large change in the distance from the rear cover to the lower edge. For this reason, among the conventional devices, there has appeared a device for rotating the tiller cover itself around the axis of the tiller shaft in an attempt to always keep the inclination of the rear cover constant regardless of the size of the tilling depth. As for the rotation adjustment of the tilling cover, there is a drawback that the operation is troublesome and the accuracy is insufficient because the method of rotating the manual operation lever to adjust the rotation is generally used.

[0005]

[Means for Solving the Problems]

The present invention has been proposed in view of the above problems, and has taken the following technical means. That is, the rotary cover 17 that rotates in the front-rear direction while covering the cultivating part 16 and the actuator 20 that rotates the rotary cover 17.
And a tiller depth setting device I for setting the position of the rotary cover 17 and a sensor S2 for detecting the front-back rotation position of the rotary cover 17, and the tiller depth setting device I is used for When it is operated to the "" side, the rotary cover 17 is rotated to a predetermined rear position, and when it is operated to the "deep" side of the plowing depth, the rotary cover is rotated.
A tilling depth control device for a rotary tiller is characterized in that a control portion 13 is provided for moving 17 to a predetermined position in front.

[0006]

Embodiments of the present invention will be described below based on the embodiments shown in the drawings. As shown in side view in FIG.
The rotary cultivator 2 is connected to the tractor 1 by the working machine connection link mechanism 5 including the lower links 3 and 3 at the lower left and right and the top link 4 at the upper center, and the lift cylinder 7 of the hydraulic lifting mechanism 6 is lifted. The left and right lift arms 9 and 9 that rotate up and down as the piston 8 moves in and out are connected to the lower links 3 and 3 via the left and right lift rods 10 and 10.
In order to automatically control the plowing depth, the plowing depth setting value set by the operator using the plowing depth setting device I made of a volume or the like is set to the rotary plowing device 2 of the rotary plowing device 2. Until the plowing depths match, the on / off operation commands of the ascending solenoid valve 11 or the descending solenoid valve 12 are sent from the control unit 13 such as a microcomputer to the ascending drive unit 14 or the descending drive unit 15. It is provided so as to be amplified and output via.

A cover 17 for covering the rear of the tilling part 16 of the rotary tiller 2 is provided with a drive case 18 for the rotary tiller 2.
Also, the fulcrum pins 19, 19 are pivotally supported on the left and right side stays so that the cover 17 can be rotated up and down by the movement of the piston 21 of the hydraulic actuator 20. When a plurality of tilling depth sensors S1 are laterally arranged at the trailing edge of -17 and the trailing edge of the cover 17 is in a grounded state, the working depth 22 of the tilling depth sensor S1 is grounded. For example, the normally open contact is provided so as to be turned on, and for example, the fixed cover-2 of the rotary cultivator 2 is provided.
The vertical rotation position of the cover 17 with respect to 3 is detected by a stroke sensor S2 constituted by using, for example, a linear sliding type potentiometer, and the operator sets the working depth setting device I. If the tilling depth setting value is specified by operating, the cover-1 will be applied when the tilling section 16 is located at this tilling depth setting value.
The rotation position at which 7 should be maintained is calculated by the control unit 13, and a command from the control unit 13 is sent via the ascending drive unit 24 or the descending drive unit 25 so that the cover 17 is located at this rotational position. Then, the ascending solenoid valve 26 or the descending solenoid valve 27 is turned on and off, whereby the piston 21 of the hydraulic actuator 20 is configured to move in and out, and subsequently, the working depth sensor S1 of the working depth sensor S1. The control unit 13 is configured so that an operation command is output from the control unit 13 to the hydraulic lifting mechanism 6 so that the rotary tiller 2 is raised or lowered to a position at which the majority of the rotary type tillers are turned on. Therefore, if the working depth setting device I is operated to reduce the working depth,
When hydraulic oil is sent into the hydraulic actuator 20, the cover 17 moves downward, and conversely, when the working depth is deepened, the cover-1
7 moves up. The moving amount of the cover 17 is determined corresponding to the set value by the tilling depth setting device I on both the ascending side and the descending side, and the moving amount is monitored by the stroke sensor S2.

In the above example, at the start of the plowing work, the operator turns the plowing depth setting device I to set the plowing depth, and advances the tractor-1 while lowering the rotary plowing device 2. Then, the cover 17 is rotated to a predetermined position according to the set value by the plowing depth setting device I, and at the same time, some of the actuators 22 of the plowing depth sensor S1 are in contact with the ground, and the plowing work is continued in that state. To be done.

During the tilling work, when the tiller 16 is about to move in a direction in which some of the actuators 22 of the tillage depth sensor S1 move away from the ground due to the unevenness of the ground and the tiller depth becomes shallow, the hydraulic lifting mechanism 6 operates. Lower the whole rotary tiller 2, and in the opposite case raise the entire rotary tiller 2 to raise the tiller 1
6 is controlled to keep it in place. For this reason, the plowing depth is always maintained at the preset plowing depth, and the surface of the cultivated soil pressed by the cover 17 is leveled without being wavy.

[0010]

As described above, according to the present invention, the rotary cover 17 which rotates in the front-rear direction while covering the cultivating part 16 and the actuator 20 which rotates the rotary cover 17 are provided.
And a tiller depth setting device I for setting the position of the rotary cover 17 and a sensor S2 for detecting the front-back rotation position of the rotary cover 17, and the tiller depth setting device I is used for When it is operated to the "" side, the rotary cover 17 is rotated to a predetermined rear position, and when it is operated to the "deep" side of the plowing depth, the rotary cover is rotated.
Since 17 is provided with the control unit 13 to move to a predetermined position in front, the operator operates the plowing depth setting device I so that the rotary cover 17 can quickly and accurately move to a predetermined position. As a result, the operability is remarkably improved as compared with the conventional device.

[Brief description of drawings]

FIG. 1 is a side view of a rotary cultivator and a tractor.

FIG. 2 is a control circuit diagram.

FIG. 3 is a perspective view showing a relationship between a cover and an actuator.

[Explanation of Codes] 1 tractor 2 rotary tiller 5 working machine connecting link mechanism 6 hydraulic lifting mechanism 7 lift cylinder 8 lift piston 9 lift arm 10 lift rod 13 control circuit (control section) 16 tilling section 17 ro- Tally cover 20 Actuator (hydraulic actuator) S1 Cultivation depth sensor S2 Stroke sensor I Cultivation depth setting device

Claims (1)

[Claims] 1. A rotary cover 17 which rotates in the front-back direction while covering the cultivating part 16, an actuator 20 which rotates the rotary cover 17, and a rotary cover 17.
A sensor S2 for detecting the back-and-forth rotation position and a rotary cover
It consists of a tilling depth setting device I for setting a position of 17, the plowing
When the depth setting device I is operated to the "shallow" side, the rotary cover
-17 is rotated to a predetermined position at the rear, and operated to the "deep" side of the working depth.
When you make it, the rotary cover 17 will move to a predetermined position in front.
A tilling depth control device for a rotary tiller, which is provided with a control unit 13 for moving .