JP2848769B2 - Tillage depth adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for adjusting the depth of a cultivator, which is capable of automatically controlling the depth of a cultivator mounted on a tractor.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No.
There is one disclosed in Japanese Patent Application Laid-Open No. -109103. In this technology, a cultivator is mounted on 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 a rear cover is provided on the cultivator. In order to operate the operating arm of the hydraulic device in the ascending direction, the inner wire of the wire linking means is operatively connected to the sensor body and the relay rocker, and the rocking of the relay rocker is transmitted between the relay rocker and the operating arm. A swing transmission means that transmits a swing amount changeable is interlocked and connected, and both ends of an outer wire surrounding the inner wire are connected to a tractor side and a cultivator side.

In this prior art, when the sensor body is rotated by the vertical movement of the rear cover, the amount of movement of the inner wire increases as the angle between the inner wire and the operating arm or the sensor body approaches from a right angle to a right angle. Therefore, when the cultivation depth becomes shallower, the amount of movement of the inner wire increases, and in order to correct it, a swing transmission means is provided so that the amount of movement of the operation arm can be adjusted with respect to the amount of movement of the inner wire, and the cultivation depth is reduced. When it is shallow, the swing amount of the operating arm can be controlled to be small.

[0004]

However, in the tillage depth adjustment, the adjustable range differs between when the set tillage depth is shallow and when the set tillage depth is deep, and when the set tillage depth is shallow, the adjustable range is narrow because the distance to the ground surface is short. When it is deep, the adjustable range is wide because the distance to the ground surface is long. In addition, there is play in the connection between the inner wire and the sensor body, the operating arm, etc. When the inner wire is pulled through the sensor body, the operating arm is swung after absorbing the play, and the responsiveness is increased by the play. Is high and low.

[0005] In the above-mentioned prior art, it is effective to always maintain the set cultivation depth accurately even when the set cultivation depth is shallow or deep. Since the working arm cannot be swung until the tillage machine moves up and down (allowable range of the set tillage depth), it is difficult to adjust the tillage depth with high accuracy. The depth adjustment becomes difficult, and the adjustable tillage range is narrowed.

According to the present invention, a tractor-side end of an outer wire is movably supported to a cultivator side via a support, and this can be held at a moving position. By changing the amount of swing transmitted to the working arm from the, the amount of play can be changed according to the cultivation depth, and highly accurate adjustment can be performed even at shallow cultivation depth,
Further, it is an object of the present invention to provide a tilling depth adjustment device for a cultivator capable of widening a cultivating range and, at the same time, reducing an amount of elevation of the cultivator at a shallow cultivating depth.

[0007]

A specific 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. Sensor body 6 for detecting vertical movement of rear cover 5
In order to operate 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 the wire linking means 8 is connected to the sensor body 6 and the relay rocker 41 in an interlocking manner.
1 and the operating arm 7 are interlockingly connected by a rocking transmission means 14 for transmitting the rocking of the relay rocking body 41 so that the rocking amount can be changed.
In the cultivator tillage depth adjusting device in which both ends of the outer wire 10 surrounding the inner wire 9 are connected to the tractor 1 side and the cultivator 4 side, one end of the outer wire 10 is movably supported on the tractor 1 side toward the cultivator side. And a holding means 13 for holding the support 11 at a moving position, and the support 11 is moved between the support 11 and the swing transmission means 14 by the movement of the support 11 toward the tiller. An adjustment means 25 for reducing the amount of swing transmitted by the motion transmission means 14 is provided.

[0008]

When the cultivator 4 during tilling is lowered due to the softness or the like of the field, the rear cover 5 is raised, and the sensor body 6 detects this and swings the operating arm 7 via the inner wire 9 and the relay rocker 41. Then, the hydraulic device 3 is operated to the upside of the cultivator 4, and the cultivator 4 is controlled so as to reach the set tillage depth.

When the tilling operation is performed at a shallow tillage depth, the support 11 is moved and operated through the operating means 12 and the holding means 13 is operated.
When the end position 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, the curvature of the curve therebetween is reduced, and the inner wire 9 is pulled. The play between the inner wire 9 and the sensor body 6 and the operating arm 7 is absorbed, and the vertical movement of the rear cover 5 is immediately
And a highly responsive plowing depth adjustment is performed.

When the support 11 is moved toward the cultivator, the rocking transmission means 14 is operated via the adjusting means 25, and the amount of rocking transmitted from the relay rocking body 41 to the operating arm 7 is reduced. The lifting amount of the tiller 4 corresponding to the unit lifting amount of the rear cover 5 is reduced, and the tilling operation at a shallow tilling depth can be normally performed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In the embodiment shown in FIGS. 1 to 4, reference numeral 1 denotes a tractor showing only a rear portion, in which a hydraulic device 3 for lifting and lowering a work implement is mounted on a rear upper portion of a transmission case 15, and a PTO transmission case 16, and a top link bracket 17 is mounted on the back of the hydraulic device 3. Reference numeral 18 denotes a rear wheel, and 19 denotes a floor seat.

Reference numeral 2 denotes a link mechanism exemplified by a three-point link mechanism. The link mechanism has a top link 20 and a pair of left and right lower links 21. The cultivator 4 is mounted on the tractor 1 so as to be movable up and down. The link 21 is connected to a lift arm 22 of the hydraulic device 3 via a lift rod 23 so as to be able to move up and down. The hydraulic device 3 is conventionally known, and includes a hydraulic cylinder for rotating the lift arm 22, a control valve for operating the hydraulic cylinder, a position for operating a spool of the control valve, and a draft control link mechanism. Feedback means,
In the draft control, feedback is provided 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 covering the cultivator 26 is fixed to a gate-type machine frame 28 in front view, and a rear cover 5 covering the rear of the cultivator 26 is an upper cover. The rear cover 5 is pivotally supported by the rear end of the cover 27 so as to be vertically movable. A part of the rear cover 5 is formed by a rubber cover body 29. Detecting means 30 is arranged between the rear upper part of the upper cover 27 and the rear cover 5. This detection means 3
Numeral 0 pivotally supports the sensor body 6 and the interlocking body 33 via a pivot shaft 32 to a bracket 31 provided at the rear upper portion of the upper cover 27, and connects the interlocking body 33 and the rear cover 5 with a rod 34. I have.

The sensor body 6 is provided at one end with a pin 35 which is in contact with the upper surface of the interlocking body 33 and at the other end with a 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 via the pin 35 to move the rear cover 5 up and down. Then, the inner wire 9 is pushed and pulled. The sensor body 6 is formed with a plurality of pin holes 36 for mounting pins 35 so that the distance from the pivot 32 can be changed. By inserting the pin 35 into the pin hole 36 at a distance far from the pivot shaft 32, the rear cover 5 assumes a posture at a shallow plowing depth, and inserting the pin 35 into the pin hole 36 at a short distance takes a posture at a deep plowing depth. The sensor body 6 is connected to the pin 35 by the interlocking body 33.
It is urged to oppose.

As the wire linking means 8, Bowden wire or push-pull wire is used.
The rear end of the outer wire 10 surrounding the upper cover 2
7 is fixed. A first attachment body 38 is fixed to a rear upper portion of the tractor 1, and a second attachment body 38 is attached to the first attachment body 38.
The mounting body 39 is fixed or integrally formed, and the support 11 is supported by the second mounting body 39 via a horizontal shaft 40 so as to be able to swing back and forth, and the front end of the outer wire 10 is disengaged by the support 11. They are freely connected.

A holding means 13 is provided between the horizontal shaft 40 and the support 11 to apply frictional resistance such as a disc spring or a friction plate to hold the support 11 at the swinging position. The end on the one side can be held at the moved position. A relay rocker 41 is supported by a mounting portion provided upright on the first mounting body 38 via a pivot 42, and one end of the relay rocker 41 is connected to a front end of the inner wire 9. The other end of 41 is connected to the operating arm 7 via a connecting rod 43. The relay rocker 41 is urged by a coil spring 44 in the pulling direction of the inner wire 9.

The pin 51 at the rear end of the connecting rod 43 is inserted into the long hole 52 of the relay rocker 41. When the position of the pin 51 in the long hole 52 changes and the distance from the pivot 42 changes, The amount of movement of the connecting rod 43 corresponding to the unit swing angle of the relay rocker 41 changes, and the relay rocker 41 and the operating arm 7 are interlocked and linked to each other, whereby the rocking of the relay rocker 41 is performed. A swing transmission means 14 that transmits the transmission swing amount so as to be changeable is configured.

A bell-crank adjusting lever 53 is pivotally supported on the mounting portion of the first mounting body 38. One end of the adjusting lever 53 is connected to the support 11 via a rod 54, and the other end is a pin. 55 is provided, and this pin 55 is an elongated hole 56 formed at the rear of the connecting rod 43.
, And these constitute an adjusting means 25.

When the support 11 swings toward the cultivator 4, the adjusting lever 53 swings counterclockwise in FIG. 2 through the rod 54, and the connecting rod 25 swings through the pin 55. 43 is moved upward, so that the pin 51
Is brought closer to the pivot 42 to change the direction in which the amount of transmission swing of the swing transmission means 14 is reduced. Reference numeral 12 denotes operating means, which includes an operating rod 45 connected to the support 11, a rotating body 47 pivotally supported by a bracket 46 fixed to the hydraulic device 3 and having one end connected to the operating rod 45, An operation arm 48 pivotally supported by the control arm 48 and a connecting rod 49 connecting the operation arm 48 and the other end of the rotating body 47. That is, the outer wire 10 can be moved in a direction of moving the front end of the outer wire 10 toward and away from the rear end.

The connecting rod 43, the operating rod 45, the connecting rod 49, the rod 54 and the like are adjustable in length, and the first mounting body 38, the bracket 46 and the like may be mounted on the transmission case 15. Next, the plowing depth adjustment operation in the present invention will be described. The minimum depth of the tiller 4 at the time of plowing 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 tillage depth so that the detecting means 30 operates normally. It is adjusted to.

When the cultivation depth is relatively deep, as shown by a two-dot chain line in FIG.
2 is moved to the front side (at a position away from the tiller 4), and when the cultivation depth is relatively shallow, the operation arm 48 is rotated to the front side as shown by the solid line in FIG. (The position approaching the cultivator 4), and is held at each position by the holding means 13.

When the field is softened during tilling and the cultivator 4 is lowered, the rear cover 5 is raised, and the rear cover 5 is
5 and the like, the sensor body 6 detects, the inner wire 9 is pulled by the swing of the sensor body 6, the operating arm 7 is swung by the swing of the relay swing body 41, and the draft cam shaft 24
Is turned to operate the hydraulic device 3 on the ascending side of the cultivator 4 to control the cultivator 4 to reach the set tilling depth.

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

When the support 11 is moved backward,
The adjusting means 25 is also operated at the same time, the adjusting lever 52 is rocked to operate the rocking transmission means 14, and even if the relay rocking body 41 rocks at a certain angle, the rocking amount of the operating arm 7 is reduced, and the tiller 4 The amount of elevating and lowering the elevating speed is reduced, and stable work is performed at shallow plowing depth. FIG. 5 shows a modification of the adjusting means 25, in which a bell-crank-shaped adjusting lever 53 is pivotally supported by a pivot 42, and one end of the adjusting lever 53 is formed with a long hole 57, and is provided in the middle of the operating rod 45. The other end is provided with a pin 55 at the other end as in the above embodiment, and the support 11 is swung by the movement of the operation rod 45 swinging toward the tiller 4 side. It operates in a direction to reduce the transmission swing amount of the dynamic transmission means 14.

The present invention is not limited to the above embodiment, but can be variously modified. For example, the operating means 12 may be omitted, and the support 11 may be directly operated manually and the support 11 may be bolted to the pivot position.

[0026]

According to the present invention described in detail above, the outer wire 10 of the wire linking means 8 for linking the sensor body 6 for detecting the vertical movement of the rear cover 5 and the operating arm 7 of the hydraulic device 3 to each other. One end is movably supported by the support 11 on the tractor 1 side toward the cultivator, the support 11 is held at the moving position by the holding means 13, and the support 11 is moved through the adjustment means 25 by the movement of the support 11. Since the amount of swing of the operating arm 7 is reduced by operating the motion transmitting means 14, the outer wire 1
Move one end of 0 to the tiller side to reduce the distance between both ends,
The play between the inner wire 9 and the sensor body 6 and the operating arm 7 to which the inner wire 9 is connected can be absorbed, and when the cultivation depth is shallow, the play can be reduced and the cultivation depth can be adjusted with high accuracy. This makes it possible to increase the cultivation range, and at the same time, it is possible to reduce the amount of elevation of the cultivator when the cultivation depth is shallow.

[Brief description of the 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 plan view of the same.

FIG. 5 is a side view showing a modification of the adjusting means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tractor 2 Link mechanism 3 Hydraulic device 4 Tiller 5 Rear cover 6 Sensor body 7 Working arm 8 Wire linking means 9 Inner wire 10 Outer wire 11 Supporting body 12 Operating means 13 Holding means 14 Swing transmission means 25 Adjusting means 41 Relay rocking body

Claims (1)

(57) [Claims] A cultivator (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 freely. A sensor body (6) for detecting movement is provided, and a wire link is provided to operate 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 the means (8) is operatively connected to the sensor body (6) and the relay rocker (41), and the relay rocker (41) and the operating arm (7) are connected to the relay rocker (41). Transmission means (1) for transmitting the oscillation of the transmission so as to change the transmission oscillation amount.
In the cultivating depth adjusting device of the cultivator, the both ends of the outer wire (10) surrounding the inner wire (9) are connected to the tractor (1) side and the cultivator (4) side. On the 1) side, there is provided a support (11) for movably supporting one end of the outer wire (10) to the cultivator, and holding means (13) for holding the support (11) at a moving position. Adjusting means (2) between the body (11) and the rocking transmission means (14) for reducing the amount of rocking transmitted by the rocking transmission means (14) by moving the support (11) toward the tiller.
5) A tillage depth adjusting device for a tiller, which is provided with: