JPS6056446B2 - Rice transplanter's planting device lifting mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an upper link that is pivotally connected to the machine so that it can only rotate freely, a vertical link that is pivotally connected to the front end of the upper link so that it can only swing freely, and a lower link that is pivotally connected to the lower end of the link and extends in the same direction as the upper link in a parallel or substantially parallel attitude; and a rear end of the upper link and a rear end of the lower link. The planting device is connected to the machine so as to be able to rise and fall freely via a parallel four-speed link mechanism consisting of a rear vertical link that is pivotally connected, and the above-mentioned upper link or its interlocking member is connected to a fixed part on the machine side. A cylinder for driving the parallel four-speed link mechanism is interposed between the two links or their interlocking members among the upper link, lower link, vertical link, and rear vertical link. , among the entire vertical range of the planting device, in the lower range, the parallel oscillating movement of the parallel quadruple link mechanism is allowed, and in the upper range, any two of the links or their interlocking members are connected to each other. A rice transplanter's planting device lifting mechanism is provided with a member that locks and prevents the parallel swinging movement of the parallel quadruple link mechanism. Automatic lifting and lowering control of the planting device for adjusting the planting depth, and so-called position control that raises and lowers the planting device to a height position corresponding to the operating position of the manual operation lever in the upper range and holds it there can be performed appropriately and easily. The point is to try to make it so.

First, an embodiment of the present invention will be described based on the drawings. At the rear of the riding machine 1, there are a seedling stand 2 in a forward-leaning position and a planting claw 3.
In this riding rice transplanter, a five-row planting device 5 equipped with four groups of soil leveling floats is connected so as to be movable up and down. A mechanism is provided for linking a device 7 for detecting the planting depth, which changes as the planting depth changes, and a manual operation lever 9 provided near the driver's seat 8.

The drive elevating mechanism 6 includes an upper link 11 that extends rearward from a swing shaft 10 that is rotatably supported by the machine 1 and rotates integrally with the swing shaft 10, and The vertical link 12 is swingable, and its front end is pivoted to the lower end of the vertical link 12. a lower link 13 which is supportingly connected and substantially parallel to the upper link 11; and the upper link 1.
1 and a rear vertical link 24 that pivotally connects the rear end of the lower link 13.
between the vertical link 12 and the lower link 13. Due to the abutting action of the pivot connecting part 16 to the fixing part on the machine 1 side and the biasing action due to the weight of the planting device 5 pivotally connected to this link mechanism A, the pivot connecting part 16 becomes a swing support. The free end of the link arm 14, which is provided to be held at a specific position around the shaft 10, fixedly extends from the swing support shaft 10, and is interlocked and connected to the upper link 11, is attached to the main body 1 side fixed part. a hydraulic cylinder 15 that drives the link mechanism A between
The planting device 5 is moved up and down in parallel by the drive parallel swing movement of the link mechanism A.

Furthermore, this driving elevating mechanism 6 is provided between the lower link 13 and the link arm 14 in a lower planting depth adjustment range of the entire elevating range of the planting device 5, in which the link mechanism A is parallel to the lower link 13 and the link arm 14. The link arm 14 is allowed to swing and is locked in contact with a member 18 attached to the tip of the tension rod 17 swingably extending from the lower link 13 in an upper range. The link mechanism A
The entire linkage mechanism A and the planting device 5 are rotated up and down around the swinging support shaft 10 while preventing the parallel swinging motion of the linkage mechanism A. Due to the movement, the planting device 5 moves up and down while maintaining a constant attitude relative to the machine, and in the upper range, the rotation of the entire link mechanism A causes the inclination angle of the seedling stand 2 of the planting device 5 relative to the ground to rise upward. A mechanism 19 is configured to drive the planting device 5 up and down with respect to the machine 1 so that the size gradually becomes smaller as the size increases. By changing the position of this abutment locking member 18 in the longitudinal direction of the rod, the relative position of the link mechanism A when the link arm 14 is abutted and locked to the abutment locking member 18 is changed. It is configured such that its motion conversion position can be changed by changing the deformation state.The planting depth detection device 7 is provided with the float 4 swingable up and down using the vicinity of the rear end as a fulcrum. At the same time, this float 4 is oscillated in the ground contact direction (downward) at a set pressure, and this float 4 is oscillated to follow the ground pressure fluctuations caused by changes in plowing depth (variations in planting depth). A setting spring 20 is provided, and the float 4 is used as a sensor 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. The valve 21 is interlocked with the lever 9 and the vertical link 12 of the link mechanism A so that the lever 9 is maintained at one end position P of its operating path.
, the valve 21 is allowed to operate in conjunction with the sensor float 4, and when the lever 9 is in a position other than the one end position P, the valve 21 is prohibited from interlocking with the sensor float 4 in the upper range. At the same time, the planting device 5 is automatically raised and lowered to a height position commensurate with the amount of operation from the one end position P of the lever 9, and is linked in such a manner that it is stopped and held at that position. is structured as follows.

In other words, as described above, the valve 21 and the sensor float 4
A first linking rod R1 is provided to link the first linking rod R1 to the valve 21, and a connecting point a between the first linking rod R1 and the valve 21 is provided.
A member 22 that can swing with a seesaw using the lever as a fulcrum, and a lever 9
By pressing one end of the seesaw swinging member 22 based on the operation, the seesaw swinging member 22 swings around the other end against the pressing force of the setting spring 20 acting on the connection point a. the second linking rod R2 that can be moved to switch the valve 21 to the raised state; and the seesaw as the vertical link 12 in the link mechanism A swings upward around the swinging support shaft 10 based on the operation of the lever 9. When the other end of the swinging member 22 is moved 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, the valve 21 is held in the raised state. In this state, connect the seesaw swinging member 22 to the connection point a.
When the seesaw swinging force around the one end becomes smaller than the pressure force at the connection point due to the seesaw swinging, the seesaw swinging member 22 is rocked around the one end, and the valve 21 is placed in the neutral position. A feedback rod R3 is provided which causes the operating position of the lever 9 to correspond to the lifting/lowering stop position of the planting device 5 by switching to the (lifting/lowering stopped) state. 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. A spring 23 is interposed to apply a valve actuation force of a size commensurate with the amount, and to reduce the applied valve actuation force as the planting device 5 actually moves up and down. 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. , the valve 21 is configured so that the planting depth is maintained at the set depth based on the detection result by the sensor 4.
The valve 2 is interlocked and connected for automatic control.
1 and the sensor 4 is provided, and the seesaw swinging member 22 is provided.
A manual operation lever 9 for the valve 21 is provided on one end side.
The other end of the seesaw swinging member 22 is connected to the vertical link 1 based on the operation of the lever 9.
2 is fed back to the valve 21,
It is characterized in that a member R3 for stopping and holding the planting device 5 at a height position corresponding to the operating position of the lever 9 is connected.

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. Since the interlocking connection of the seesaw swinging member 22 to the valve 21 for stopping and holding the valve 21 in the vertical position is performed at one point, the interlocking structure of the interlocking connection of both 4 and 22 to the valve 21 can be made such that the connecting pin can be shared. It's easy. Moreover, in the upper range, the lever moves the planting device 5 up and down in parallel in the lower range, and in the upper range, the planting device 5 is rotated.
Regardless of whether the planting device 5 is raised or lowered, the swinging shaft 1 remains in a constant position, and only when the planting device 5 is raised or lowered in the upper range.
As the vertical link 12 swings around 0, the height position of the planting device 5 is fed back to the valve 21, and the planting device 5 is automatically stopped at the height position corresponding to the operation position of the lever 9. Planting device 5 in the entire lifting range
The upper link 11 of the link mechanism A is displaced as the
Compared to systems that perform the above-mentioned feedback using the displacement of the lower link 13 or the planting device 5 itself, there is no need for a special flexibility mechanism to cut off the feedback when the planting device 5 moves up and down in the lower range. The feedback system can be configured with a simple structure.Therefore, with a simple structure as a whole, it can be used to automatically raise and lower the planting device for adjusting the planting depth in the lower range, and to control the lever operation position in the upper range. It has become possible to perform position control for raising and lowering the planting device 5 to a height position and holding it at a stopped position.Moreover,
In position control, the planting device position may be fed back even though the planting device 5 is located in the lower range, or conversely, the planting device 5 may already be located in the upper range but not fed back. There are no malfunctions due to errors in the flexibility mechanism, etc., and the height can be fed back only when the planting device 5 is located in the upper range, so there is an advantage that the desired position can be controlled with high precision. be.

[Brief explanation of the drawing]

The drawings show 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, and FIG. A perspective view of the section mechanism,
FIG. 4 to FIG. 7 are explanatory diagrams of the operation of raising and lowering the planting device. 1... Machine, 10... Swinging shaft, 11
...Top link, 12...Vertical link,
13... Lower link, A... Parallel four-link mechanism, 5... Planting device, 14... Link arm, 15... Cylinder, 16...・・・・・・
Pivot connection part, 4...Sensor, 21...Valve, 22...Seesaw swinging member, R3...
・Part 9...Manual operation lever.

Claims (1)

[Claims] 1. An upper link 11 that is pivotally connected to the machine 1 so that it can only rotate, a vertical link 12 that is pivotally connected to the front end of the upper link 11 so that it can only swing, and a lower end of the vertical link 12. A lower link 13 that is pivotally connected and extends in the same direction as the upper link 11 in a parallel or substantially parallel attitude, and a rear end of the upper link 11 and a rear end of the lower link 13 are pivotally connected. The planting device 5 is connected to the main machine 1 so as to be able to rise and fall freely via a parallel four-link mechanism A consisting of a rear vertical link 24 that supports and connects, and the above-mentioned upper link 11 or its interlocking member 14 and the main machine A cylinder 15 for driving the parallel quadruple link mechanism A is interposed between the first side fixed part and any one of the upper link 11, the lower link 13, the vertical link 12, and the rear vertical link 24. or two links 11, 13 or their interlocking member 14
Of the entire vertical range of the planting device 5, the parallel quadruple link mechanism A is allowed to swing in parallel in the lower range, and any two links 11 are allowed in the upper range. 13 or their interlocking members 14 abutting and locking each other to prevent the parallel swinging movement of the parallel four-link mechanism A, the rice transplanter's planting device lifting mechanism is provided with and a planting depth control sensor 4 provided on the side of the planting device 5, so that the planting depth is maintained at the set depth based on the detection result by the sensor 4. A member 22 is provided which is interlocked and connected for automatic control and is swingable around the connection point a between the valve 21 and the sensor 4, and is provided at one end of the seesaw swinging member 22. The operation lever 9 is interlocked and connected, and the other end side of the seesaw swinging member 22 feeds back the swinging displacement of the vertical link 12 based on the operation of the lever 9 to the valve 21 to control the planting device 5. A planting device lifting mechanism for a rice transplanter, characterized in that a member R_3 for stopping and holding the lever 9 at a height corresponding to the operating position thereof is connected thereto.