JPH07111804A - Plowing depth control device of power tiller - Google Patents

Abstract

PURPOSE:To provide an automatic plowing depth control of a power tiller linked to a tractor by taking advantage of a link type draft control mechanism. CONSTITUTION:A plowing depth controlling device characterized by connecting a power tiller 4 as capable of freely elevating and lowering through a hydraulic device having a link mechanism 2 for elevating and lowering and a link type draft control mechanism 25 to a tractor 1, by setting a sensor part 6 detecting the up and down movements of a rear cover 5 on the power tiller 4, and having equipped with a wire link means 8 to operate a control valve 14 of the hydraulic device to upward direction on detecting the upward motion of the rear cover 5 by the sensor part 6. The wire link means 8 consists of an inner wire 9 and an outer wire 10 surrounding the inner wire, where the inner wire 9 is connected as interlocked to a working arm 7 of a draft cam shaft 24 in the link type draft control mechanism 25 and to the sensor part 6, and each one of the ends of the outer wire 10 is connected to the side of the tractor 1 and to the side of the power tiller 4.

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 A tractor is equipped with a hydraulic control device such as a position control and a draft control. The draft control is provided with a load spring on a top link mount, and the draft cam shaft is actuated by the detection result of the load spring. Arm is responding (Japanese Patent Publication No. 5-4424)
No. 2).

[0003]

In the prior art described in the above publication, the load can be detected by the load spring when the plow is mounted on the tractor, but the load can be detected when the cultivator is mounted on the tractor. Since a spring or the like is not required, the actuating arm of the draft cam shaft is a substantially useless long object.

Therefore, an object of the present invention is to make it possible to automatically adjust the working depth of the cultivator by using the operating arm of the draft cam shaft when the cultivator is mounted on the tractor.

[0005]

According to the present invention, a cultivator 4 is mounted on a tractor 1 via a hydraulic device 3 having a lifting link mechanism 2 and a link type draft control mechanism 25 so that the cultivator 4 can be lifted and lowered. A cultivator having a sensor body 6 for detecting the vertical movement of the rear cover 5 and a wire linking means 8 for operating the control valve 14 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 tilling depth adjusting device of the machine, the following technical measures are taken to achieve the above-mentioned object.

That is, according to the present invention, the wire linking means 8 includes the inner wire 9 and the outer wire 1 surrounding the inner wire 9.
0, and the inner wire 9 corresponds to the draft cam shaft 2 in the link type draft control mechanism 25.
4 is connected to the operation arm 7 of 4 and the sensor body 6,
Both ends of the outer wire 10 are connected to the tractor 1 side and the cultivator 4 side, respectively.

[0007]

When the cultivator 4 is lowered due to hardness and softness in the field to increase the cultivating depth at the set cultivating depth, the rear cover 5 rises, and the sensor body 6 detects this and causes the inner wire 9 to intervene. When the actuating arm 7 of the draft cam shaft 24 is swung, the control valve 14 is switched to the upward direction via the link type draft control mechanism 25, and the cultivator 4 is raised by the hydraulic device 3 and the elevating link mechanism 2 for setting. Control so that the working depth is reached.

[0008]

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 is a lifting link mechanism exemplified by a three-point link mechanism, and includes a top link 20 and a pair of left and right lower links 21.
And a cultivator 4 are mounted on the tractor 1 so as to be able to move up and down, and a pair of left and right lower links 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 includes a lift arm 22.
Has a hydraulic cylinder for rotating, a control valve 14 for operating the hydraulic cylinder, a link type position and draft control mechanism 25 for operating the spool 14A of the control valve, and a position feedback means. Actuating arm 7 provided on the draft cam shaft 24
Is connected to the top link bracket 17 via a rod for feedback.

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 gate 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 with a pin 35 that abuts the upper surface of the interlocking body 33 at one end, and the wire linking means 8 at the other end.
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, a Bowden wire or a 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 for 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 one end connected to the operating rod 45. 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. 50 is a position control lever, 5
Reference numeral 1 denotes a draft operation lever, which can be operated back and forth with a support shaft 52 of the operation arm 48 as a common shaft, and both levers 50 and 51 have a double shaft structure position operation shaft 54 and a draft operation via an interlocking link 53. It is interlocked to rotate the shaft 55 around its axis.

As shown in FIG. 2, the link type control mechanism 25 includes a vertically movable swingable spool retainer 56 engaged with the spool 14A and a position balancer 58 pivotally supported by a cross shaft 57. A connector 59, a position connector 60 pivotally supported by the position operation shaft 54 and engaged between the balancer 58 and the connector 59 in a retractable manner, and a first part connecting the draft operation shaft 55 and the lower portion of the connector 59. The two draft links 61 and 62, the draft cam 63 that is in contact with the second draft link 62 from the rear surface, the position cam 65 that is engaged with the position balancer 58 and is provided on the arm shaft 64, and the spool retainer. It is composed of a push metal fitting 66 connecting the 56 and the connector 59.

Next, the plowing adjustment operation in the present invention will be described. The minimum depth of the cultivator 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 tilling depth, and the detecting means 30 is provided.
Is adjusted to operate normally. When the working depth is relatively deep, the operation arm 48 is rotated rearward to move the support 11 to the front side (a position away from the tiller 4), and when the working depth is relatively shallow, the operation arm 48 is moved. It rotates to the front side and supports 1
1 is moved to the rear side (position approaching the cultivator 4) and held by the holding means 13 at each position.

When the field softens and the cultivator 4 lowers during the tillage, the rear cover 5 rises, and the rear cover 5 and the pin 3 are connected to the rear cover 5.
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 switch the control valve 14 to the upward direction, and the hydraulic device 3 is operated to the upward side of the cultivator 4 so that the cultivator 4 is controlled to a set plowing depth.

On the contrary, when the field hardens and the cultivator 4 is raised during the tillage, the rear cover 5 is lowered, 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 the both ends of 0 is deformed so that the pole ratio becomes small, and the inner wire 9 is pulled, and the play between the inner wire 9 and the sensor body 6, the relay oscillating 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 tiller 4 is quickly adjusted.

[0020]

According to the present invention described in detail above, the automatic drafting depth control of the tiller mounted on the tractor can be performed by utilizing the link type draft control mechanism.

[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 lifting link mechanism 3 hydraulic device 4 cultivator 5 rear cover 6 sensor body 7 operating arm 8 wire linking means 9 inner wire 10 outer wire 14 control valve 24 draft cam shaft 25 draft control mechanism

Claims (1)

[Claims] 1. A lifting link mechanism (2) for a tractor (1).
And a sensor for mounting the tiller (4) so as to be able to move up and down through a hydraulic device (3) having a link type draft control mechanism (25), and detecting up and down movement of the rear cover (5) on the tiller (4). A body (6) is provided, and a wire linking means (8) is provided for operating the control valve (14) 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, the wire linking means (8) includes an inner wire (9) and an outer wire (10) surrounding the inner wire (9), and the inner wire (9) includes the link type draft control mechanism ( 25) is linked to the working arm (7) of the draft cam shaft (24) and the sensor body (6),
Both ends of the outer wire (10) are connected to the tractor (1) side and the cultivator (4) side, respectively.