JPS646022Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is configured so that the ground float of the planting device, which is connected to the machine so as to be able to move up and down freely, is also used as a ground pressure detection sensor, and the sensor float and the planting device A mechanism is provided for linking the spool of the lift control valve, and a lower operation position that allows switching of the spool based on ground pressure detection of the sensor float and an operation position that maintains the spool in the vertical neutral state; An elevating lever is provided that can be continuously operated from a lifting operation position that switches the spool from an elevating neutral state to an elevated state, and in conjunction with the operation of this elevating lever to a lowering operating position, the transmission system to the planting device is interposed. The present invention relates to a lifting control operating device for a planting device in a rice transplanter, which is configured to automatically and reversibly engage and operate a planting clutch.

With this type of lift control operating device, when the planting device is raised above the ground to replenish seedlings, the seedling platform of the planting device may stop in the middle of the reciprocating movement stroke, and it may be that the seedlings are being replenished as they are. ,
At the beginning of the planting process, even if the seedling tray reaches the stroke end, the seedling tray may not be properly fed vertically due to the leftover seedlings, which may result in missing plants. It is necessary to replenish seedlings while moving them. However, when the lifting lever is operated to the engaged position of the planting clutch, the planting device automatically lowers based on the detection result of the sensor float, so after the seedling stand reaches the stroke end, the planting device is raised again from the ground. There is an inconvenience that has to be done.

Conventionally, as a means of resolving this operational inconvenience when replenishing seedlings, a special lever was provided for a separate system that could turn on and off the planting clutch. In addition to the clutch operation mechanism, it is necessary to include a spring in the linkage mechanism between the lift lever and the planting lever to allow the clutch to be disengaged by the dedicated lever when the lift lever is in the raised or neutral operation position. Not only is it structurally more complex, but
It tends to be expensive, and in addition, it is necessary to insert and operate a dedicated lever against the biasing force of the spring, which has the disadvantage of making the operation difficult.

In view of the above-mentioned circumstances, an object of the present invention is to solve the inconvenience of adjusting the position of the seedling stand when replenishing seedlings without causing the above-mentioned drawbacks.

The device for controlling the elevation and descent of a planting device in a rice transplanter according to the present invention, as described above, is provided with a mechanism for checking the switching operation of the spool to the lowering state based on the ground pressure detection of the sensor float, which can be freely released. Therefore, when it becomes necessary to adjust the position of the seedling stand of the planting device raised above the ground to the stroke end to supply seedlings, after setting the check mechanism to the check mode, By operating the elevating lever to the lower operating position, only the planting clutch can be freely engaged and operated while the planting device is held elevated above the ground.

Therefore, since it is only necessary to check the switching operation of the spool to the lowered state based on the detection result of the sensor float, the inconvenience of adjusting the position of the seedling stand when replenishing seedlings can be avoided, and the drawbacks of the conventional method can be avoided. It has now been possible to resolve the issue without causing any problems.

In the following, a rear-mounted riding rice transplanter to which the present invention is applied will be explained. A planting device B for row planting is connected in a manner that can be raised and lowered, and two ground floats 3, 3 are attached to this planting device B, which can swing up and down using the front and rear center portions as fulcrums.
are arranged side by side in the left and right direction, and the frame 1
A hydraulic cylinder 4 is installed between the hydraulic cylinder 4 and the link mechanism 2, and the planting device B is driven to move up and down by switching an elevation control valve 5 for the hydraulic cylinder 4.

Further, the grounding floats 3, 3 are configured as sensor floats that detect changes in ground pressure from the vertical displacement of their swinging fulcrums, and a mechanism rigidly connects the swinging fulcrums of these sensor floats 3, 3 so as to be integrally variable. 6, the rigid body connection mechanism 6 and the elevation control valve 5 are linked, and based on the integrated vertical displacement of the ground floats 3, 3,
The planting device B is configured to automatically control the drive up and down so that the ground pressure of these ground floats 3, 3 is maintained within a set range.

The rigid connection mechanism 6 includes arms 10 that are pivotally connected to the common connection shaft 8 that is rotatably supported by the planting transmission case 7 of the planting device B, and to the brackets 9, 9 of the ground floats 3, 3, respectively. . It is structured as possible.

Further, a spring 12 is provided which biases the floats 3, 3 in the direction of ground contact via the sensing arm 11, and this spring 12 and an operating lever 13 on the side of the machine A are linked via a release wire 14. By operating this operating lever 13, the set sensing load by the spring 12 can be changed.

The linkage mechanism 15 between the rigid body connection mechanism 6 and the elevation control valve 5 is configured by the elevation control valve 5.
Inner and outer double shafts 16,1 provided in the valve case 5B of
7, an arm 18 that can forcibly switch the spool 5A of the valve 5 into three states, a neutral state, a raised state, and a lowered state, is fixed to one end of the inner shaft 16, and the arm 18 is fixed to the other end of the inner shaft 16. A spring 21 is provided which connects the fixed arm 19 and the sensing arm 11 of the rigid body connection mechanism 6 via a release wire 20 and biases the inner shaft 16 to rotate in the upward operation direction.

Then, when the ground pressure of the sensor floats 3, 3 increases and the rocking fulcrums of both the ground floats 3, 3 are integrally displaced upward by a certain amount or more, the release wire 20 is loosened, and the elevation control valve 5 is The planting device B is switched to the ascending state by the biasing force of the spring 21, and the planting device B is controlled to ascend until the ground pressure of the grounding floats 3, 3 returns to within the set range. Conversely, when the ground pressure of the sensor floats 3, 3 decreases and the rocking fulcrums of both sensor floats 3, 3 are integrally displaced downward by a certain amount or more, the release wire 20 is pulled, The lift control valve 5 has a spring 21
The planting device B is switched to the lowering state against the urging force of , and the lowering control of the planting device B is performed until the ground pressure of the sensor floats 3, 3 returns to within the set range.

Moreover, since the grounding floats 3 and 3 are rigidly connected, the vertical displacement of one of the grounding floats 3 or 3 due to local unevenness fluctuations of the grounding surface in the left-right direction is absorbed by the other grounding float 3 or 3. suppressed by the ground thrusting action and pulling back action,
Elevation control can be performed by capturing the overall unevenness variation of the ground surface over the entire float ground width.

Further, an arm 22 is fixed to one end of the outer shaft 17, and the arm 22 is capable of pressing and switching the spool 5A of the valve 5 only to the raised state side, and the sensor is attached to the middle part of the outer shaft 17 in the axial direction. Spool 5A based on the detection results of floats 3 and 3
Continuous operation is possible over a lower operation position D that allows switching operation, a neutral operation position N that maintains the spool 5A in the vertical neutral state, and an upward operation position U that switches the spool 5A from the vertical neutral state to the raised state. A raising/lowering lever 23 is arranged in series, and in conjunction with the operation of the raising/lowering lever 23 to the lowering operation position D, a planting clutch 24 interposed in the transmission system to the planting device B is automatically and reversibly engaged. A mechanism 25 for actuation is provided.

A mechanism 26 for checking the switching operation of the spool 5A to the lowering state based on the detection results of the sensor floats 3, 3 is provided so as to be able to release the check.

This restraining mechanism 26 includes a rod 26b with an operation grip 26a which is rotatably supported on the valve case 5B side, and is fixed to the tip of the rod 26b, and when the rod 26b rotates,
Arm 1 of the linkage mechanism 15 in the vertical neutral position
It is comprised of a U-shaped restraining member 26c that can be switched to a restraining state in which it is fitted into the arm 19 and a restraining release state in which it is detached from the arm 19.

Further, as shown in FIG. 3, a buffer spring 28 is interposed between the piston rod 4A of the hydraulic cylinder 4 and a U-shaped connecting member 27 attached to the link mechanism 2 side, and One end of a regulating member 31 having a long hole 30 for regulating the amount of elevation of the planting device B, in particular, the maximum lifting position of the planting device B is attached to the side, and the other end of this regulating member 31 is attached to the long hole 30. It is removably fixed to the cylinder case 4B of the hydraulic cylinder 4 via a bolt 29 inserted into the cylinder case 4B.

Then, by releasing the fixation between the hydraulic cylinder 4 and the regulating member 31, the planting device B can be raised to the maximum extension stroke of the hydraulic cylinder 4. In other words, the planting device B is connected to this machine A.
Since a large amount of polymerization can be achieved within the front and rear width of the rice transplanter, transportation of the rice transplanter can be carried out advantageously in terms of space.

As shown in FIG. 4 A and B, the elongated hole 30 of the regulating member 31 is fitted into the pin 32 provided on the cylinder case 4B of the hydraulic cylinder 4, so that the planting device B can not run on the road. Elongated hole portion 3 that allows for lifting and lowering between a suitable ground elevation position and a planting work position
0a, a hole 30b for locking the planting device B in a state raised above the ground up to the maximum extension stroke of the hydraulic cylinder 4, and both of these hole portions 30.
a, 30b, and a narrow hole 30c that communicates with the pins 30a and 30b. The long hole portion 30a or the locking hole portion 3
It may be configured to allow relative movement to 0b.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the lifting control operation device for the planting device in the rice transplanter according to the present invention, and show the first embodiment.
The figure is an overall side view of the riding rice transplanter, Figure 2 is an elevation control system diagram, Figure 3 is an enlarged sectional view showing the mounting structure of the hydraulic cylinder for elevation, and Figure 4 A and B show other cylinder mounting structures. They are an enlarged sectional view of the main part and a plan view of the main part. A...this machine, B...planting device, 3...ground float, 5...lifting control valve, 5A...spool, 23...lifting lever, 24...planting clutch, 26...checking mechanism.

Claims (1)

[Scope of Claim for Utility Model Registration] The grounding float 3 of the planting device B, which is connected to the machine A so that it can be driven up and down, is configured to also serve as a ground pressure detection sensor, and this sensor float 3 and the planting device A mechanism 15 is provided to link the spool 5A of the elevation control valve 5 of B, and a descending operation position D that allows the switching operation of the spool 5A based on ground pressure detection of the sensor float 3 and the spool 5A is placed in an elevation neutral state. The neutral operating position N to maintain the position and
An elevating lever 23 is provided that can be continuously operated from the neutral state to the elevating state of the spool 5A to the elevating operation position U.
Lifting and lowering of the planting device in the rice transplanter configured to automatically and reversibly engage and operate the planting clutch 24 interposed in the transmission system to the planting device B in conjunction with the operation to the lowering operation position D of No. 3. Lifting and lowering control of a planting device in a rice transplanter, characterized in that the control operation device is provided with a mechanism 26 for checking switching operation of the spool 5A to the lowering state based on ground pressure detection of the sensor float 3, which can be released from the check at will. Operating device. The lifting and lowering control operation device for a planting device in a rice transplanter according to claim 1, wherein the check mechanism 26 is provided in the linkage mechanism 15.