JPS6317404B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an upper link that extends so as to be able to rotate integrally with a swinging support shaft that is rotatably supported by the machine, and a swinging support shaft that swings around the axis of the swinging support shaft. The planting device is connected to the machine so as to be movable up and down via a four-parallel link mechanism consisting of a lower link pivotally connected to the lower end of the vertical link that can be freely moved. A cylinder for driving the parallel quadruple link mechanism is interposed between the free end of the outer link arm and the machine-side fixed part, and a pivot connecting part between the vertical link and the lower link and the Between the link arm or the upper link, the parallel oscillating movement of the parallel quadruple link mechanism is allowed in the lower range of the entire lifting range of the planting device, and the parallel swing movement is allowed in the upper range. This invention relates to a lifting mechanism for a rice transplanter's planting device, which is equipped with a mechanism capable of converting a four-link mechanism into rotational movement around the pivot axis, the purpose of which is to have a simple structure. automatic lifting and lowering control of the planting device for adjusting the planting depth in the lower range, and so-called position control that raises and lowers the planting device and holds it at a height corresponding to the operating position of the manual operation lever in the upper range. The point is to make it possible to do it properly and easily.

First, an embodiment of the present invention will be described based on the drawings.The riding machine 1 has a rear part equipped with a seedling stand 2 in a forward-leaning position, three groups of planting claws, and four groups of soil leveling floats.
In a riding rice transplanter in which a row-type planting device 5 is connected so as to be movable up and down, a mechanism 6 for driving the planting device 5 up and down with respect to the main machine 1 is connected to a planting depth that changes as the depth of the tiller changes. A mechanism is provided for linking the detection device 7 with a manual operation lever 9 provided near the driver's seat 8.

The drive elevating mechanism 6 extends rearward from a swing shaft 10 rotatably supported by the machine 1 while rotating integrally therewith, and has an upper portion pivotally connected to the planting device 5 at its rear end. Link 11 and
A vertical link 1 that is parallel to this and is swingable at its front end with respect to the swing support shaft 10.
2, and a lower link 13 which is pivotally connected to the planting device 5 at its rear end. The pivot connecting portion 16 is provided in a state where it is held at a specific position around the swinging shaft 10 by the abutting action of the portion 16 against the fixed portion on the main body 1 side and the biasing action by the weight of the planting device 5. , a hydraulic cylinder 15 for driving the link mechanism A is interposed between the free end of the link arm 14 fixedly extending from the swing support shaft 10 and a fixed part on the machine 1 side, and the link mechanism A is driven. The planting device 5 is configured to be raised and lowered by a parallel rocking motion. Furthermore, this drive elevating mechanism 6 is provided between the pivot connecting portion 16 and the link arm 14 in the lower planting depth adjustment range of the entire elevating range of the planting device 5. In a range above which parallel swing motion is allowed, the link arm 14 is brought into contact with a member 18 attached to the tip of the tension rod 17 extending from the pivot joint 16, and the pivot is supported. By swinging the connecting portion 16, that is, the vertical link 12, around the swing support shaft 10, the parallel swing motion of the link mechanism A is converted into a motion in which the entire link mechanism A rotates around the swing support shaft 10. A converting mechanism 19 is provided, so that in the lower range, the posture of the planting device 5 relative to the plant is maintained constant by the parallel swing movement of the link mechanism A, and in the upper range, the entire link mechanism A The planting device 5 is configured to be driven up and down with respect to the machine 1 so that the angle of inclination of the seedling stand 2 of the planting device 5 to the ground becomes gradually smaller as it moves upward. The movement converting mechanism 19 has a nut that screws the abutting member 18 onto the tension rod 17, and by changing the position of the abutting member 18 in the longitudinal direction of the rod, the link arm 14 comes into contact with the abutting member 18. By changing the height position of the link mechanism A at the time of contact, the movement conversion position can be changed.

The planting depth detection device 7 is provided with the float 4 swingable up and down using a fulcrum near the rear end thereof, and urges the float 4 to swing in the ground contact direction (downward) with a set pressure. This float 4
A setting spring 20 that oscillates to follow changes in ground pressure caused by changes in plowing depth (changes in planting depth).
, and use the float 4 as a sensor.
It is configured to detect the planting depth by vertically swinging the sensor float 4.

The linkage mechanism controls the control valve 21 for the hydraulic cylinder 15 using a three-position switching valve and the sensor float 4 so that the planting depth is set to a set depth based on the detection result of the sensor float 4 in the lower range. Valve 2 to be maintained at
1 for automatic control, while the valve 21, the lever 9, and the vertical link 12 of the link mechanism A are connected so that the lever 9 is at one end position P of its operating path.
, the valve 21 is allowed to operate in conjunction with the sensor float 4, and the lever 9 is
is at a position other than the one end position P, the interlocking operation of the valve 21 with respect to the sensor float 4 is cut off in the upper range, and at the same time, the planting device is moved to a height position commensurate with the amount of operation of the lever 9 from the one end position P. 5 is linked in such a way that it automatically raises and lowers it, and also stops and holds it in that position. Specifically, it is constructed as follows.

That is, as described above, the first linking rod R ₁ is provided to link the valve 21 and the sensor float 4, and the first linking rod R ₁ and the valve 21 can swing around the connecting point a as a fulcrum. By pressing one end of the seesaw swinging member 22 based on the operation of the lever 9, the seesaw swinging member 22 is moved against the pressing force of the setting spring 20 acting on the connection point a. The second linking rod R ₂ can switch the valve 21 to the raised state by swinging around the other end, and the vertical link 12 swinging around the swing shaft 10 in the link mechanism A based on the operation of the lever 9. When the other end of the seesaw swinging member 22 is moved along with the upward swing and the pushing force of one end by the lever 9 is greater than the pushing force of the setting spring 20 acting on the connection point a, , when the seesaw swinging member 22 is made to swing around the connection point a while the valve 21 is held in the raised state, and the pushing force at one end becomes smaller than the pushing force at the connection point due to this seesaw swinging. By swinging the seesaw swinging member 22 around one end and switching the valve 21 to a neutral state (stopping the elevation), a lever is created that makes the operating position of the lever 9 correspond to the lifting stop position of the planting device 5. There is an Eid Bucket _R6 . In addition, in the linkage mechanism between the lever 9 and the valve 21, the lever 9 is elastically deformed according to the amount of operation accompanying the operation of the lever 9, thereby allowing the lever 9 to be operated in advance to a predetermined position. Provides a valve operating force commensurate with the amount,
In addition, a spring 23 is interposed to reduce the valve actuation force applied as the planting device 5 actually moves up and down. The pivot connection structure between the first linking rod R ₁ and the seesaw swinging member 22 with respect to the valve 21 is such that the end of the rod R ₁ is bent, and this bent end R ₁ is attached to a common pivot pin. This is a pivot connection.

In summary, the planting device lifting mechanism of the rice transplanter according to the present invention is the mechanism explained at the beginning, and includes a control valve 21 for the drive cylinder 5 and a planting depth control sensor 4 equipped on the planting device 5 side. , so that the planting depth is maintained at the set depth based on the detection result by the sensor 4,
A member 22 that is interlocked and connected to automatically control the valve 21 and is swingable around a connection point a between the valve 21 and the sensor 4;
is provided on one end side of this seesaw swinging member 22,
The manually operated lever 9 is interlocked and connected to the valve 21, and the other end side of the seesaw swinging member 22 is configured to feed back the swinging displacement of the vertical link 12 based on the operation of the lever 9 to the valve 21. The present invention is characterized in that a member _R3 is connected thereto for stopping and holding the planting device 5 at a height position corresponding to the operating position of the lever 9.

That is, in the lower range, the sensor 4 is interlocked with the valve 21 for automatically raising and lowering the planting device 5 based on the detection of the planting depth, and in the upper range, the planting device 5 is moved to a height corresponding to the lever operation position based on the lever operation. A seesaw swinging member 2 for the valve 21 to stop and hold the valve 21 in the vertical position.
Since the two interlocking connections are made at one point, the interlocking structure for connecting the two valves 4 and 22 to the valve 21 is simple, such as the ability to share a connecting pin. In addition, in the upper range, the lever moves the planting device 5 parallelly up and down in the lower range, and in the upper range, the linkage mechanism A moves the planting device 5 in a rotational manner. The height position of the planting device 5 is adjusted to the position of the valve 21 by swinging the vertical link 12 that swings around the swinging shaft 10 only as the planting device 5 moves up and down in the upper range. Since the lever 9 is automatically stopped at the height position corresponding to the operating position of the lever 9, the upper link 11, lower link 13, or , compared to the above-described feedback using the displacement of the planting device 5 itself, there is no need for a special flexibility mechanism to cut off the feedback when the planting device 5 is raised and lowered in the lower range, and the structure of the feedback system is simplified. Can be configured. Therefore, with a simple structure as a whole, the automatic lifting control of the planting device for adjusting the planting depth in the lower range and the lifting and lowering of the planting device 5 to a height position corresponding to the lever operating position in the upper range are possible. It has now become possible to perform position control to stop and hold the machine. Moreover, in the position control, the position of the planting device 5 may be fed back even though it is located in the lower range, or conversely, the position of the planting device 5 may be already located in the upper range but not fed back. There are no malfunctions due to errors in the flexible mechanism, such as when the planting device 5 is not in position, and the height can be fed back only when the planting device 5 is located in the upper range, so the desired position can be controlled with high precision. There are also benefits to be gained.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the raising and lowering mechanism of the planting device of the rice transplanter according to the present invention, FIG. 1 is a side view of the entire rice transplanter, FIG. 2 is an enlarged side view with a partial cutout of the main part,
FIG. 3 is a perspective view of the main mechanism, and FIGS. 4 to 7 are explanatory views of the operation of raising and lowering the planting device. DESCRIPTION OF SYMBOLS 1... This machine, 10... Swing shaft, 11... Upper link, 12... Vertical link, 13... Lower link, A... Parallel four-link mechanism, 5... Planting device, 14... Link arm, 15... cylinder,
16... Pivotal connection part, 19... Movement conversion mechanism, 4
...Sensor, 21...Valve, 22...Seesaw swinging member, _R3 ...Member, 9...Manual operation lever.

Claims (1)

[Claims] 1 An upper link 11 that extends so as to be able to rotate integrally with the swinging support shaft 10 that is rotatably supported by the machine 1, and a vertical link 12 that can only swing freely around the axis of the swinging support shaft 10. The planting device 5 is connected to the main machine 1 so as to be movable up and down via a parallel quadruple link mechanism A consisting of a lower link 13 pivotally connected to the lower end, and is fixedly extended from the pivot shaft 10. A cylinder 15 for driving the parallel quadruple link mechanism A is interposed between the free end of the link arm 4 and the fixed part on the machine 1 side, and the vertical link 12
Between the pivot connection part 16 of the lower link 13 and the link arm 14 or the upper link 11, there is a parallel swing of the parallel quadruple link mechanism A in the lower range of the entire lifting range of the planting device 5. A mechanism 19 that allows a dynamic movement and is capable of converting the parallel quadruple link mechanism A into a rotational movement around the seven rocking support shafts in an upper range.
This is a planting device lifting mechanism of a rice transplanter that is equipped with a control valve 21 for the drive cylinder 15 and a planting depth control sensor 4 equipped on the planting device 5 side. The valve 21 is interlocked and connected for automatic control so that the planting depth is maintained at the set depth based on the set depth, and the valve 21 is swingable around the connecting point a between the valve 21 and the sensor 4. A member 22 is provided, and one end side of the seesaw swinging member 22 is interlocked with the manual operation lever 9 for the valve 21, and the other end side of the seesaw swinging member 22 is connected with the manual operation lever 9 based on the operation of the lever 9. The swinging displacement of the vertical link 12 is controlled by the valve 21.
A rice transplanting device lifting mechanism for a rice transplanter, characterized in that a member _R3 is connected to feed back the planting device 5 to stop and hold the planting device 5 at a height position corresponding to the operating position of the lever 9.