JPS6143004B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention maintains the attitude of the planting device relative to the plant constant or almost constant in a planting depth adjustment region between the present machine and the planting device, and further provides In the upper region, the rice transplanter is provided with a mechanism for driving the planting device up and down with respect to the machine so that the angle of inclination of the seedling stand on the planting device side to the ground gradually becomes smaller as it goes upward.

In this type of rice transplanter, the attitude of the planting device relative to the machine remains constant or almost constant during planting work, 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 perform good planting at a constant or almost constant planting depth and planting posture by keeping the cutting action and the plunge angle of the planting nails into the mud constant or almost constant, and yet,
In the upper region, the seedling stand is placed in a nearly horizontal position, and the seedlings can be conveniently replenished and placed on the seedling stand without any unexpected movement of the seedlings.

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. It is an object of the present invention to provide a rice transplanter that can be operated easily and quickly, and can also control the planting depth well.

Next, an embodiment of the present invention will be described based on the drawings. A planting device 5 equipped with an inclined seedling stand 2, a planting claw 3, and a soil leveling float 4 at the rear of the riding machine 1.
between these two 1 and 5, the attitude of the planting device 5 relative to the machine is maintained constant in the planting depth adjustment region, and the planting device 5 is connected to the plant in a region above the region. 5 seedling stand 2
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. Board depth detection device 7
A mechanism is provided for linking the driver's seat and 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 end of the link arm 14 fixedly extending from the swing support shaft 10 and the 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 driving elevating mechanism 6 is provided between the pivot connecting portion 16 and the link arm 14 in the lower planting depth adjustment area of the entire elevating area of the planting device 5. In a region that allows parallel rocking motion and is above it, 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 region, the posture of the planting device 5 relative to the plant is maintained constant by the parallel swing motion of the link mechanism A, and in the upper region, the entire link mechanism A is 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 goes 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 tiller depth detection device 7 is configured to
The float 4 is provided so as to be able to swing up and down using a fulcrum near its rear end, and the float 4 is biased to swing in the direction of ground contact (downward) with a set pressure, so that the float 4 can be used to control changes in the depth of the tillage (planting depth). A setting spring 20 is provided that swings to follow ground pressure fluctuations caused by ground pressure fluctuations, and the float 4 is used as a sensor to detect the plowing depth by vertical swinging of the sensor float 4. There is.

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 a set depth based on the detection result of the sensor float 4 in the lower region. Valve 2 to be maintained
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 move relative to the sensor float 4, and the lever 9 is
is at a position other than the one end position P, the movement of the valve 21 relative to the sensor float 4 is cut off in the upper region, and at the same time, the plant is planted at a height corresponding to the amount of operation of the lever 9 from the one end position P. The device 5 is linked to automatically raise and lower the device 5 and to stop and hold the device 5 at that position. Specifically, the device 5 is configured as follows.

That is, the first linking rod R ₁ linking the valve 21 and the sensor float 4 as described above;
A linkage mechanism 26 consisting of a first swinging arm 24 and a relay wire 25 is provided, and a feedback arm is provided that can see-saw swing around the connection part a between the first linkage rod _R1 and the spool 21a of the valve 21 as a fulcrum. the swinging member 22 and the lever 9 as
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. A linkage mechanism 29 consisting of a second linkage rod R ₂ , a second swing arm 27, and a rod 28 that can be moved to switch the valve 21 to the raised state, and a vertical link in the linkage mechanism A based on the operation of the lever 9. The setting spring 20 moves the other end of the seesaw swinging member 22 as it swings upward around the swinging support shaft 10 of 12, and a pressing force of one end of the seesaw swinging member 22 is applied to the connection point a by the lever 9. In a state where the pressing force is greater than the pressing force, the seesaw swinging member 22 is rocked around the connection point a while the valve 21 is held in the raised state, and the pressing force at one end is caused by the swinging of the seesaw. When the pressure becomes smaller than the point pressing force, the seesaw swinging member 22 is swung around one end, and the valve 21 is switched to the neutral state (lifting stopped) and operated, thereby changing the operating position of the lever 9 and the planting device 5. A linkage mechanism 32 is provided which includes a feedback rod R ₃ , a third swinging arm 30, and a rod 31, which correspond to the lifting and lowering stop position.
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 that applies a valve actuation force commensurate with the amount and reduces the applied valve actuation force as the planting device 5 actually moves up and down.

In summary, in the rice transplanter according to the present invention, the control valve 21 of the driving lifting mechanism 6 is used to maintain the planting depth at a constant or almost constant level in the planting depth adjustment region of the planting device 5.
and the float 4 of the planting device 5, and in the above-mentioned upper region, the planting device 5 is raised and lowered to a height position commensurate with the amount of displacement operation of the manual operation lever 9, and is held at that position. The manual operation lever 9 is linked to the control valve 21 of the drive lifting mechanism 6 in order to A linkage mechanism 29 is connected to the arm 22 near the connection point a between the valve sprue 21a and the feedback arm 22, and also links the manual operation lever 9 and the control valve 21, as well as the drive lifting mechanism 6 and control. A linking mechanism 32 linking the valve 21 is characterized in that it is connected to one end and the other end of the feedback arm 22, respectively.

That is, during planting work, the automatic operation of the drive lifting mechanism 6 based on the detection result of the vertical movement of the float 4 makes it possible to reliably and accurately maintain the planting depth within the set range without requiring any special manual operation. can. Moreover, in the upper region, simply by operating the manually operated lever 9 to an arbitrary position, the planting device 5 is raised and lowered to a height position corresponding to the amount of displacement operation,
In addition, since it is possible to reliably stop and hold the planting device 5 at the desired height position, for example, while switching the drive lifting mechanism 6 between the lifting operation state and the operation stop state via the manual operation lever, the planting device 5 can be moved to the desired height position. Compared to the case where the planting device 5 is raised and lowered to a desired height, the operation of raising and lowering the planting device 5 to a desired height position and stopping and holding the planting device 5 can be made very simple. Therefore, as the machine rotates at the edge of the field, it is very easy and quick to raise and lower the planting device 5 to the minimum necessary height position depending on conditions such as ridge height. As a result, the planting device 5 can be raised and lowered efficiently when turning the machine, and the time required for turning the machine can be shortened.

Further, a linking mechanism 26 that links the float 4 and the control valve 21 is configured to provide a feedback arm 22 of the control valve 21 to a spool 2 of the valve.
1a and the feedback arm 22 near the connection point a, and a linkage mechanism 29 that links the manually operated lever 9 and the control valve 21, and a linkage that links the drive lifting mechanism 6 and the control valve 21. Since the mechanism 32 is connected to the feedback arm 22 at one end and the other end, for example, the linking mechanism 29 of the manual operation lever 9 can be connected to the valve of the The spool 21a and the feedback arm 22 are connected near the connection point a, and the linkage mechanism 26 of the float 4 and the linkage mechanism 3 of the drive elevating mechanism 6
2 is connected to one end side and the other end side of the feedback arm 22, respectively, manual operation allows fine adjustment by a large movement of the lever 9. Automatic control using vertical movement has the advantage that small movements of the float can be sensitively sensed, allowing good manual lifting and lowering operations and automatic lifting control using the float.

Therefore, the present invention has the following advantages as a whole, by combining the ability to plant well without mistakes and the ability to turn the aircraft at the edge of the field in the shortest possible time.
We have now been able to provide a rice transplanter that can perform planting operations efficiently.

[Brief explanation of the drawing]

The drawings show an embodiment of the rice transplanter according to the present invention, in which Fig. 1 is an overall side view, Fig. 2 is an enlarged side view with a partial cutout of the main part, Fig. 3 is an enlarged perspective view of the main part, and Fig. 3 is an enlarged side view of the main part. 4 to 7 are explanatory diagrams of the raising and lowering operation of the planting device. DESCRIPTION OF SYMBOLS 1... This machine, 4... Float, 5... Planting device, 6... Drive lifting mechanism, 9... Human operation lever, 21... Control valve, 21a... Spool, 22... Feedback arm ,26,2
9, 32...Linkage mechanism, a...Connection point.

Claims (1)

[Claims] 1 Between the planter 1 and the planting device 5, the attitude of the planting device 5 relative to the planter is maintained constant or almost constant in the planting depth adjustment region, and the planting device 5 is A 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 of the seedling stand 2 on the device 5 side relative to the ground gradually decreases as it goes upwards.
When the planting device 5 is in the above-mentioned planting depth adjustment region, the control valve 21 of the drive lifting mechanism 6 and the float 4 of the planting device 5 are linked to automatically maintain the planting depth at a constant or almost constant level. At the same time, in the above-mentioned upper region, the manual operation lever 9 is moved up and down by the drive lifting mechanism in order to raise and lower the planting device 5 to a height position commensurate with the amount of displacement operation of the manual operation lever 9, and to hold it at that position. 6, and further includes:
A linking mechanism 26 that links the float 4 and the control valve 21 is connected to the feedback arm 22 of the control valve 21 by connecting the spool 2 of the valve to the feedback arm 22 of the control valve 21.
1a and the feedback arm 22 near the connection point a, and a linkage mechanism 29 that links the manual operation lever 9 and the control valve 21, and a linkage that links the drive lifting mechanism 6 and the control valve 21. The mechanism 32 includes the feedback arm 22.
A rice transplanter characterized in that the rice transplanter is connected to one end and the other end of the rice transplanter.