JPH07111802A - Tillage depth adjusting device for cultivator - Google Patents

Abstract

(57) [Summary] [Structure] A cultivator 4 is mounted on a tractor 1 via a link mechanism 2 and a hydraulic device 3 so as to be vertically movable, and a sensor body 6 for detecting vertical movement of a rear cover 5 is provided on the cultivator 4. , The inner wire 9 of the wire linking means 8 is interlockingly connected to the sensor body 6 and the operating arm 7 so as to operate the operating arm 7 of the hydraulic device 3 in the upward direction by detecting the upward movement of the rear cover 5 by the sensor body 6, and the outer wire 10 Both ends of the tractor 1 side and the tiller 4
Connect to the side. A support body 11 that movably supports one end of the outer wire 10 toward the cultivator side and a holding means 13 that holds the support body 11 at the moving position are provided on the tractor 1 side. [Effect] It is possible to move one end of the outer wire 10 to the cultivator side and reduce the distance between both ends to absorb the play between the inner wire 9 and the sensor body 6 and the operating arm 7 and the like to which the inner wire 9 is connected. When the working depth is shallow, the play can be reduced and the working depth can be adjusted with high accuracy, and the tilling range can be widened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilling depth adjusting device for a tiller which can automatically control the tilling depth of a tiller mounted on a tractor.

[0002]

2. Description of the Related Art As a conventional technique of this type, Japanese Patent Laid-Open No. 59-59
There is one disclosed in Japanese Patent Laid-Open No. 109103. In this technology, a cultivator is attached to a tractor via a link mechanism and a hydraulic device so as to be able to move up and down, and a sensor body for detecting the vertical movement of the rear cover is provided on this cultivator. In order to operate the operating arm of the hydraulic system in the ascending direction, the inner wire of the wire linking means is interlockingly connected to the sensor body and the operating arm, and both ends of the outer wire surrounding the inner wire are connected to the tractor side and the tiller side. Has been done.

In this prior art, when the sensor body is rotated by raising and lowering the rear cover, the inner wire moves more as the angle between the inner wire and the working arm or the sensor body approaches from a right angle to a right angle. When the working depth is shallow, the moving amount of the inner wire increases, and in order to correct it, the swing amount of the working arm can be adjusted with respect to the inner wire unit moving amount, and when the working depth is shallow, the working arm swings. The amount of movement is controlled to be small.

[0004]

By the way, in the adjustment of the working depth, the adjustable range differs depending on whether the set working depth is shallow or deep, and when it is shallow, the adjustable range becomes narrow because the distance to the ground surface is short. When the depth is deep, the adjustable range is wide because the distance to the ground surface is long. Also, there is play in the connection between the inner wire and the sensor body, operating arm, etc.When the inner wire is pulled through the sensor body, the play arm absorbs the play and then the operating arm swings. There are highs and lows.

The above-mentioned prior art is effective for always maintaining the set plowing depth accurately when the set plowing depth is shallow or deep, but it absorbs the play even when the set plowing depth is shallow as when it is deep. Since the working arm cannot be swung without doing so, the range in which the tiller can move up and down (allowable range of set plowing depth) is wide, and it is difficult to perform precise plowing depth adjustment. It is difficult to adjust the depth, and the adjustable tillage range is narrow.

According to the present invention, the tractor side end portion of the outer wire is movably supported on the cultivator side and can be held at the moving position, so that the play is changed depending on the working depth. An object of the present invention is to provide a tilling depth adjusting device for a tiller, which enables highly accurate adjustment even at a shallow tilling depth and can widen a tilling range.

[0007]

A concrete means for solving the problem in the present invention is to mount a cultivator 4 on a tractor 1 via a link mechanism 2 and a hydraulic device 3 so as to be able to move up and down, and to this cultivator 4. Sensor body 6 for detecting the vertical movement of the rear cover 5
The inner wire 9 of the wire linking means 8 is interlocked with the sensor body 6 and the operating arm 7 in order to operate the operating arm 7 of the hydraulic device 3 in the upward direction by detecting the upward movement of the rear cover 5 by the sensor body 6. In the tiller depth adjusting device for a cultivator, both ends of an outer wire 10 surrounding the inner wire 9 are connected to the tractor 1 side and the cultivator 4 side.
On the side, a support body 11 that movably supports one end of the outer wire 10 toward the cultivator side and a holding means 13 that holds the support body 11 at the moving position are provided.

[0008]

The rear cover 5 rises when the cultivator 4 during tillage goes down due to the softness or the like in the field, and the sensor body 6 detects this and swings the operating arm 7 through the inner wire 9 to move the hydraulic device 3 Is operated to the rising side of the cultivator 4, and the cultivator 4 is controlled so as to have a set plowing depth.

When the plowing work is performed at a shallow plowing depth, the support 11 is moved through the operating means 12 and the holding means 13 is operated.
When the end of the outer wire 10 on the tractor 1 side is moved to the cultivator side, the distance between both ends of the outer wire 10 is shortened and the curvature of curvature between them is deformed to a small extent, and the inner wire 9 is pulled. Therefore, the play between the inner wire 9 and the sensor body 6, the actuating arm 7 and the like is absorbed, and the elevation of the rear cover 5 is immediately transmitted to the hydraulic device 3, and highly responsive tilling depth adjustment is performed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4, reference numeral 1 denotes a tractor showing only a rear part thereof, in which a hydraulic device 3 for raising and lowering a working machine is mounted on a rear upper portion of a mission case 15, and a PTO gear shifting case 16 is mounted on a rear surface of the mission case 15. A top link bracket 17 is attached to the back surface of the hydraulic device 3. Reference numeral 18 is a rear wheel, and 19 is a floor sheet.

Reference numeral 2 denotes a link mechanism exemplified by a three-point link mechanism, which has a top link 20 and a pair of left and right lower links 21, and the cultivator 4 is mounted on the tractor 1 so as to be vertically movable. The link 21 is connected to a lift arm 22 of the hydraulic device 3 via a lift rod 23 so as to be vertically movable. The hydraulic device 3 is conventionally known, and includes a hydraulic cylinder that rotates the lift arm 22, a control valve that operates the hydraulic cylinder, a position that operates a spool of the control valve, and a draft control link mechanism. With feedback means,
The draft control is fed back by connecting the operating arm 7 provided on the draft cam shaft 24 to the top link bracket 17 via a rod.

The cultivator 4 is exemplified by a rotary cultivator. An upper cover 27 for covering the cultivating part 26 is fixed to a machine frame 28 of a front view portal type, and a rear cover 5 for covering the rear of the cultivating part 26 is an upper cover. A rear cover 27 is rotatably supported by a rear end of the rear cover 27, and a part of the rear cover 5 is formed by a rubber cover body 29. A detection means 30 is arranged between the upper rear part of the upper cover 27 and the rear cover 5. This detection means 3
Reference numeral 0 indicates that the sensor body 6 and the interlocking body 33 are pivotally supported by the bracket 31 provided on the upper rear portion of the upper cover 27 via the pivot shaft 32, and the interlocking body 33 and the rear cover 5 are connected by the rod 34. There is.

The sensor body 6 is provided at one end with a pin 35 that abuts the upper surface of the interlocking body 33, and at the other end, the wire linking means 8
When the interlocking body 33 swings due to the vertical movement of the rear cover 5, the sensor body 6 swings around the pivot shaft 32 through the pin 35 to move the vertical movement of the rear cover 5. It is detected and the inner wire 9 is pushed and pulled. The sensor body 6 is formed with a plurality of pin holes 36 for mounting the pins 35, and the distance from the pivot shaft 32 can be changed. By inserting the pin 35 into the pin hole 36 far from the pivot 32, the rear cover 5 takes a posture at a shallow plowing depth, and when inserting it into the pin hole 36 at a close distance, it becomes a deep plowing posture. The sensor body 6 has the pin 35 connected to the interlocking body 33.
It is urged to repress.

As the wire linking means 8, Bowden wire or push-pull wire is used, and the inner wire 9
The rear end of the outer wire 10 that surrounds the
It is fixed at 7. A first mounting body 38 is fixed to the upper rear portion of the tractor 1, and a second mounting body 38 is fixed to the first mounting body 38.
The mounting body 39 is fixed or integrally molded, and the support body 11 is supported by the second mounting body 39 via a horizontal shaft 40 so as to be capable of swinging back and forth. The front end portion of the outer wire 10 is disengaged from the support body 11. It is freely connected.

Between the horizontal shaft 40 and the support body 11, there is provided a holding means 13 for holding the support body 11 in a swinging position by giving a frictional resistance such as a disc spring and a friction plate, and the tractor of the outer wire 10. The end on the first side can be held in the moved position. A relay oscillating body 41 is supported by a mounting portion erected on the first mounting body 38 via a pivot 42, and one end of the relay oscillating body 41 is connected to a front end of the inner wire 9 to form a relay oscillating body. The other end of 41 is connected to the operating arm 7 via a connecting rod 43. The relay oscillating body 41 is urged by the coil spring 44 in the pulling direction of the inner wire 9.

Reference numeral 12 denotes an operating means, which is an operating rod 45 connected to the support body 11, and a rotating body 47 pivotally supported by a bracket 46 fixed to the hydraulic device 3 and having the operating rod 45 connected to one end thereof. The operation arm 48 pivotally supported on the floor sheet and the connecting rod 49 connecting the operation arm 48 and the other end of the rotating body 47 are provided. It is movable in the front-rear direction, that is, in the direction in which the front end portion of the outer wire 10 is moved far and far with respect to the rear end portion.

The lengths of the connecting rod 43, the operating rod 45, the connecting rod 49 and the like are adjustable, and the first mounting body 38, the bracket 46 and the like are the mission case 15.
You may attach it to. Next, the plowing depth adjusting operation in the present invention will be described. The minimum depth of the tiller 4 at the time of tilling is set by controlling the position of the hydraulic device 3, and the position of the pin 35 is changed so as to correspond to the set tiller so that the detecting means 30 operates normally. Adjusted to.

When the plowing depth is comparatively deep, the operating arm 48 is rotated rearward as shown by the chain double-dashed line in FIG.
1 is moved to the front side (a position away from the cultivator 4), and when the working depth is relatively shallow, the operation arm 48 is rotated to the front side as shown by a solid line in FIG. It moves to a position (close to the cultivator 4) and is held by the holding means 13 at each position.

When the field is softened and the cultivator 4 is lowered during the tilling, the rear cover 5 is raised, and the rear cover 5 and the pin 3 are connected to each other.
5, the sensor body 6 detects the inner wire 9 by the swing of the sensor body 6, the working arm 7 is swung by the swing of the relay swing body 41, and the draft cam shaft 24
Is rotated to operate the hydraulic device 3 to the ascending side of the cultivator 4, and the cultivator 4 is controlled so as to reach the set plowing depth.

On the contrary, when the field hardens and the cultivator 4 rises during the tillage, the rear cover 5 descends, the inner wire 9 is loosened, and the hydraulic device 3 is operated to the descending side of the cultivator 4. When the support 11 is moved rearward through the operating means 12 when cultivating at a shallow plowing depth, the end of the outer wire 10 on the tractor 1 side moves to the cultivator side, and the outer wire 1
The curvature between both ends of 0 is deformed so that the curvature becomes small, and the inner wire 9 is pulled, and the play between the inner wire 9 and the sensor body 6, the relay rocking body 41, the operating arm 7, etc. is absorbed. The swing of the sensor body 6 due to the vertical movement of the rear cover 5 is immediately transmitted to the draft cam shaft 24 of the hydraulic device 3, and the plowing depth of the cultivator 4 is quickly adjusted.

The present invention is not limited to the above embodiment, but can be variously modified. For example, the operation means 12 may be omitted, and the support 11 may be directly manually operated to fix the support 11 to the rotating position by bolts, or the relay swing body 41 may be omitted to move the operating arm 7 to the draft cam shaft 2.
Alternatively, the inner wire 9 may be directly connected to the actuating arm 7 by projecting upward from No. 4.

[0022]

According to the present invention described in detail above, the outer wire 10 of the wire connecting means 8 which connects the sensor body 6 for detecting the vertical movement of the rear cover 5 and the operating arm 7 of the hydraulic device 3 in an interlocking manner. Since one end is movably supported by the supporter 11 on the tractor 1 side to the cultivator side, and this supporter 11 is held at the moving position by the holding means 13, the outer wire 10
One end of the inner wire 9 to reduce the distance between both ends to absorb the play between the inner wire 9 and the sensor body 6 and the operating arm 7 and the like to which the inner wire 9 is connected. It is possible to reduce the play when the depth is shallow and to adjust the plowing depth with high accuracy, and to widen the tillage range.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a side view showing the main part.

FIG. 3 is a partial cross-sectional rear view of the main part.

FIG. 4 is an explanatory view of the same plane.

[Explanation of symbols]

 1 tractor 2 link mechanism 3 hydraulic device 4 cultivator 5 rear cover 6 sensor body 7 working arm 8 wire linking means 9 inner wire 10 outer wire 11 support 12 operating means 13 holding means

Claims (1)

[Claims] 1. A tractor (4) is mounted on a tractor (1) via a link mechanism (2) and a hydraulic device (3) so as to be able to move up and down, and the cultivator (4) has a rear cover (5) which is vertically movable. A sensor body (6) for detecting the movement is provided, and the wire linking means for operating the operating arm (7) of the hydraulic device (3) in the ascending direction by detecting the upward movement of the rear cover (5) by the sensor body (6). The inner wire (9) of (8) is interlockingly connected to the sensor body (6) and the working arm (7), and both ends of the outer wire (10) surrounding the inner wire (9) are connected to the tractor (1) side and the cultivator (4). In the tiller depth adjusting device for a cultivator connected to the) side, a support body (11) for movably supporting one end of the outer wire (10) on the tractor (1) side and the support body (11). Holding means (13) for holding 11) in the moving position Tilling depth adjusting device tiller, characterized in that.