JPS6056445B2 - rice transplanter - 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, and any two of the upper link, the lower link, the vertical link, and the rear vertical link or their interlocking members, Of the entire vertical range of the planting device, parallel swinging motion of the parallel four-speed link mechanism is allowed in the lower range, and any two links or their interlocking members are brought into contact with each other in the upper range. The present invention relates to a rice transplanter that is provided with a member that locks and prevents the parallel oscillating movement of the parallel four-link mechanism.

With this type of rice transplanter, during planting work, the attitude of the planting device relative to the machine remains constant or almost constant regardless of whether the planting device is raised or lowered to adjust the planting depth, so the seedlings can be sent out on the seedling stand. It is possible to maintain good planting at a constant or almost constant planting depth and posture by keeping the planting action and the plunge angle of the planting nails into the mud constant or almost constant, and yet, in the upper area, the seedlings It has the advantage that the seedling table can be placed in a nearly horizontal position and the seedlings can be conveniently replenished and placed on the seedling table without moving the seedlings on the other side.

The present invention is a rice transplanter having such advantages, which allows for accurate and easy adjustment of planting depth, and also allows for the minimum elevation of the planting device required when turning the machine at the edge of the field. For easy and quick operation,
It is an object of the present invention to have a simple structure and to be able to perform so-called position control in which the planting device is stopped and held at a height position corresponding to the operating position of the manual operation lever in the above-mentioned upper range.

Next, an embodiment of the present invention will be described based on the drawings. A planting device 5 equipped with an inclined seedling platform 2, a planting claw 3, and a soil leveling float 4 is connected to the rear of the riding machine 1 so as to be movable up and down.
Between these two 1 and 5, in the planting depth adjustment area, the attitude of the planting device 5 relative to the machine is kept constant, and in the area above the area, the bacteria mounting table 2 of the planting device 5 is kept constant. A riding rice transplanter is provided with a mechanism 6 for driving the planting device 5 up and down with respect to the main machine 1 so that the angle of inclination to the ground gradually becomes smaller as it goes upward. The drive elevating mechanism 6 is linked to a plowing depth detecting device 7 and a manually operated lever 9 provided near the driver's seat 8.

The drive elevating mechanism 6 is connected to an upper link 11 extending rearward from a swing shaft 10 rotatably supported by the machine 1 and rotating integrally with the swing shaft 10. A pair of vertical links 12 that can swing freely, and this vertical link 12
The front end of the upper link 1 is pivotally connected to the lower end of the upper link 1.
1, and a rear vertical link 24 that pivotally connects the rear end of the upper link 11 and the rear end of the lower link 13. Due to the abutting action of the pivot connecting portion 16 of the vertical link 12 and the lower link 13 to the fixing portion on the main body 1 side, and the biasing action due to the weight of the planting device 5 pivotally connected to this link mechanism A, the above-mentioned A free end of the link arm 14 is provided with a pivot connecting portion 16 held at a specific position around the swing support shaft 10, and is fixedly extended from the swing support shaft 101 and operatively connected to the upper link 11. A hydraulic cylinder 15 for driving the link mechanism A is interposed between the part and the fixing part on the side of the machine 1, and the planting device 5 is configured to be raised and lowered in parallel by the drive parallel swing movement of the link mechanism A. be.

Furthermore, this driving elevating mechanism 6 is arranged between the lower link 13 and the link arm 14 in the lower planting depth adjustment area of the entire elevating area of the planting device 5, in parallel with the link mechanism A. In an area above which the swinging movement is allowed, the link arm 14 is brought into contact with and locked to a member 18 attached to the tip of the tension rod 17 that swings freely from the lower link 13. Let me,
By blocking the parallel swinging motion and swinging the vertical link 12 around the swinging support shaft 10, the entire link mechanism A and the planting device 5 can be connected while blocking the parallel swinging motion of the link mechanism A. Rotate up and down around the swing support shaft 10,
Therefore, in the lower region, the parallel swing movement of the link mechanism A allows the planting device 5 to move up and down while maintaining a constant posture relative to the planter, and in the upper region, the rotation of the entire link mechanism A raises and lowers the planting device 5. A mechanism 19 is configured to drive the planting device 5 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 gradually becomes smaller as it goes upward. The mechanism 19 abuts and locks the member 1
8 is a nut that is screwed onto the tension rod 17, and by changing the position of this abutment locking member 18 in the longitudinal direction of the rod, when the link arm 14 is abutted and locked to the abutment locking member 18, It is configured such that the relative deformation state of the link mechanism A can be changed to change its motion conversion position.
The detection device 7 is provided with the float 4 so as to be movable up and down, and biases the float 4 to move in the direction of contact with the ground to detect ground pressure fluctuations (i.e., A setting spring 20 is provided to follow changes in the planting depth (variations in planting depth), and the depth of the tiller is detected by the vertical movement of the float 4. The drive elevating mechanism 6 and the detection device 7 reversibly link the upward movement of the float 4 with respect to the set height range and the switching of the three-position control valve 21 for the hydraulic cylinder 15 to the raised position. A first rod R1 that is pivotally connected to the first rod R1 at an intermediate portion in the longitudinal direction, and is pivotably connected to the first rod R1 by swinging around one end and swinging around the other end. An arm 22 is provided which can switch the valve 21 by moving the pivot connection point a in the longitudinal direction of the first rod R1, and the arm 22 is swung around the other end in the lower area for adjusting the planting depth. By switching and operating the valve 21 based on the vertical movement of the float 4 while the plant is in motion, the planting depth is automatically maintained within a set range.

The linkage mechanism between the drive elevating mechanism 6 and the manually operated lever 9 is interlocked with the lever 9, and as the lever 9 is displaced from the reference position P at one end of the displacement path toward the other end, the arm 2
By pressing one end of 2, the arm 22 is swung around the other end against the biasing force of the setting spring 20 acting through the first rod R1. With the valve 21 disconnected from the detection mechanism 7, the valve 21 is switched to the raised position, and the lever 9 is at one end at the reference position P.
, the second rod R2 is pressed and released so that one end of the arm 22 can be freely changed in position to link the drive elevating mechanism 6 and the detection device 7, and the lever 9 is contracted and deformed according to the displacement operation amount of the lever 9. A spring 23 is provided to absorb the difference between the amount of movement of the second rod R2 due to the displacement operation of the lever 9 and the amount of swinging movement of one end of the arm 22 regulated by the valve 21. By displacing the lever 9 to the other end side, the planting device 5 is forcibly raised regardless of the detection device 7, and by positioning the lever 9 at one end reference position P, the drive lifting mechanism 6 and the detection device 7 are The planting device 5 is configured to be lowered in conjunction with each other.

and is operatively connected to the vertical link 12 of the link mechanism A, and engages and moves the other end of the arm 22 as the vertical link 12 swings upward around the swing support 10 in the upper region. By doing so, the arm 22 is swung in a direction to reduce the pressing force of the spring 23 around the pivot joint 9 that has moved as the valve 21 is switched to the raised position, and the spring 23 is Pressure force and the setting spring 2
When the biasing force due to
A rod R3 is provided with a lever 9 in the upper region.
The planting device 5 is raised and lowered to a height position commensurate with the amount of displacement operation, and is configured to be held at that position.
In summary, the rice transplanter according to the present invention has a control valve 2 for the drive cylinder 15 in the rice transplanter described above.
An arm member 22 is pivotally connected to the swing arm member 2 in such a manner that both ends thereof can swing in opposite directions.
A manual operation lever 9 for the valve 21 is provided at one end of the valve 21.
The other end side of the swing arm member 22 is connected to the vertical link 12 based on the operation of the lever 9.
A member R3 is connected thereto for feeding back the swinging displacement to the valve 21 to stop and hold the planting device 5 at a height position corresponding to the operating position of the lever 9.

That is, in the lower range, the link mechanism A is configured to move the planting device 5 up and down in parallel in the lower range and to rotate the planting device 5 up and down in the upper range. First, by vertical movement of the vertical link 12 which is in a constant posture and rotates to a vertical position corresponding to the height position of the planting device 5 only with respect to the vertical movement of the planting device 5 in the upper range. Since the height position of the planting device 5 is fed back to the valve 21 and the planting device 5 is automatically stopped and held at the height position corresponding to the lever operation position, for example, the planting device 5 can be moved in the entire vertical range of the planting device 5. In the lower range, compared to the case where the height position of the planting device 5 is fed back by the upper link 11 and the lower link 13 of the link mechanism A that are displaced as the planting device 5 moves up and down, or the displacement of the planting device 5 itself. ``There is no need for a special flexibility mechanism to cut off feedback when the planting device 5 is raised and lowered, and the feedback system for position control can be configured with a simple structure.

Moreover, even though the planting device 5 is located in the lower range, the height position of the planting device 5 is fed back, or conversely, even though the planting device 5 is located in the upper range, the height position of the planting device 5 is fed back. There is no malfunction due to errors in the flexibility mechanism, such as when the position is not fed back, and the height of the planting device 5 can be reliably and accurately fed back only when the planting device 5 is in the upper range.
It has now become possible to reliably and accurately raise and lower the planting device 5 to a desired height position and hold it there.

[Brief explanation of the drawing]

The drawings show an embodiment of the rice transplanter according to the present invention, and FIG. 1 is an overall side view, FIG. 2 is an enlarged side view with a partial cutout of the main part, and FIG.
The figure is an enlarged perspective view of the main parts, and FIGS. 4 to 7 are illustrations of the raising and lowering operation of the planting device. 1... This machine, 5... Planting device, 2.
... Seedling stand, 6 ... Drive lifting mechanism, 7
...Detection device, 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 four-link mechanism A is interposed between the first side fixed part and one of the upper link 11, the lower link 13, the vertical link 12, and the rear vertical link 24. Any two links 11, 13 or their interlocking member 1
4, within the entire lifting range of the planting device 5,
In the lower range, the parallel oscillating movement of the parallel quadruple link mechanism A is allowed, and in the upper range, any two of the links 11, 13 or their interlocking members 14 are brought into contact and locked with each other, In a rice transplanter provided with a member 18 for blocking parallel swing motion of the parallel quadruple link mechanism A, a control valve 21 for the drive cylinder 15 is provided.
An arm member 22 is pivotally connected so that both ends thereof can swing in opposite directions, and a manual operation lever 9 for the valve 21 is interlockingly connected to one end of the swing arm member 22. On the other end side of the swinging arm member 22, the swinging displacement of the vertical link 12 based on the operation of the leger 9 is fed back to the valve 21, and the planting device 5 is moved to a height corresponding to the operating position of the lever 9. A rice transplanter characterized in that a member R_3 is connected to the rice transplanter for stopping and holding the rice transplanter in the horizontal position.