JPS6419Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is based on the detection of the ground pressure of the sensor float in order to maintain the ground pressure of the sensor float installed in the seedling planting device within a set range. This invention relates to a riding rice transplanter configured to automatically switch control valves.

In the rice transplanter with the above configuration, the seedling planting device can be raised significantly when changing direction on a headland or when driving on a road, and it must be manually swung to keep it fixed at any raised position. A control lever is provided, and the control valve can be used to switch the control valve between a seedling planting device raised state, a neutral hydraulic lock state, and an automatic state in which the control valve is operated only by a sensor float. There is.
In addition, as mentioned above, when raising the seedling planting device from the planting height or lowering it from the lifted position to the planting height, it is necessary to operate the planting clutch on and off. It would be convenient if the planting clutch could also be turned on and off using the operating lever for raising and lowering the device.

In this case, of course, the planting clutch is disengaged when the control lever is switched to the raised state of the seedling planting device, and the planting clutch is engaged when switched to the automatic state. The timing of clutch engagement and disengagement was a problem.

In other words, since the raising and lowering speed of the seedling planting device cannot be very fast, when lowering it from an aerial position to the field, if the planting clutch engages before the seedling planting device has touched the ground, there is a risk that the seedlings will be taken out in the air and scattered. It was hot. To completely prevent this, a mechanism is required that detects the grounding state of the seedling planting device and engages the planting clutch, and the structure that links the ground sensor and the planting clutch becomes complicated. It was hot.

This invention enables the raising and lowering of seedlings and the opening and closing of the planting clutch at appropriate timings by simply linking the operating lever for raising and lowering the seedling planting device with the planting clutch. With the goal.

Embodiments of the present invention will be described below based on illustrative drawings.

The figure shows a seven-row riding rice transplanter, in which a parallel four-link mechanism 3 is installed at the rear of a four-wheel drive riding vehicle 1 and is vertically swung by a single-acting hydraulic cylinder 2.
A seedling planting device 4 is connected to the seedling planting device 4 so as to be movable up and down.

The hydraulic cylinder 2 is operated automatically or manually, and its configuration is shown in FIGS. 3 and 4.

That is, a three-position switching type control valve 6 that controls the operation of the hydraulic cylinder 2 is provided in the lower part near the cockpit 5 provided in the traveling aircraft 1, and when the spool 7 of this valve 6 is pushed forward, the hydraulic cylinder 2 is extended by pressure oil supply, and the seedling planting device 4 is raised, and at the rear pull-out position of the spool 7, the hydraulic cylinder 2 is shortened by oil draining operation, and the seedling planting device 4 is lowered by its own weight, and the spool 7 is raised. The hydraulic cylinder 2 is fixed at the intermediate push/pull position.

Also, among the soil leveling float group 8 provided at the lower part of the seedling planting device 4, the center float 8' is used as a sensor for automatically operating the control valve 6, and the rear part of this sensor float 8' is pivoted via a fulcrum P to a float support arm 10 attached to a planting transmission case 9, and the front part of the float is movable up and down via a pair of bending links 12a and 12b at the tip of the float support arm 11. Supported.

An inner wire 13a of the release wire 13, which is relaxed and tensioned as the bending links 12a and 12b are bent and stretched, is connected to an operating arm 15 of a spool operating shaft 14 provided in the control valve 6. A fork 17 that engages a pin 16 inserted through the spool 7 from the front and back is fixed to the end of the operating shaft 14, and a spring 18 attached to the operating arm 15 causes the operating shaft 14 to push into the spool. direction, that is, in the upward direction of the seedling planting device.

Further, a spring 19 is tensioned between the bending links 12a and 12b to bias the bending links to extend, thereby biasing the sensor float 8' to swing in the direction of contact with the ground. The spring 18 is wire-linked to a lever 20 provided on the left side of the pilot's seat 5, so that the spring load can be adjusted as desired.

The above is the configuration for automatic lifting control of the seedling planting device. When the seedling planting device 4 is at the set level with respect to the mud surface, the ground pressure of the sensor float 8' and the spring 1
The loads 9 are balanced and the control valve 6 is in a neutral position.
When the traveling machine body 1 begins to fall into a deep part of the tiller in this control neutral state, the ground pressure of the sensor float 8' increases as the seedling planting device 4 sinks, and the bending links 12a and 12b move against the spring 19. The inner wire 13a is loosened by this change, the operating shaft 14 of the control valve 6 is rotated by the spring 18, the spool 7 is pushed in, and the seedling planting device 4 is controlled to rise. . Then, when the ground pressure of the sensor float 8' decreases and returns to the original balanced state, the spool 7 returns to neutral and the upward movement is stopped. Furthermore, when the traveling body 1 climbs onto a shallow part of the plowing platform, the ground pressure of the sensor float 8' decreases, the inner wire 13a is pulled by the float's own weight and the tension of the spring 19, and the operating shaft 14 is pulled by the spring. The spool 7 is pulled out by being rotated against the spool 18,
The seedling planting device 4 is controlled to descend. Then, when the float ground pressure returns to the original level as the float descends, the descending control is stopped.

Next, a structure for manually raising and lowering the seedling planting device 4 will be explained.

An outer cylindrical shaft 21 is fitted onto the operating shaft 14 of the control valve 6, and a manual operating lever 22 is attached to the external protrusion of the valve, and the spool installation pin 16 is attached to the end of the inner shaft of the valve. A contact arm 24, which can be brought into contact only when the rear is known, is fixed to the rear, and as shown in the figure, by operating the lever 22 to the maximum forward position a and retracting the contact arm 24 to the rear. , an automatic control condition is provided in which the spool 7 is actuated only by the sensor float 8'.
By operating this lever 22 to the maximum backward position u and pushing the spool 7 forward with the abutment arm 24, the seedling planting device 4 is forcibly activated regardless of the operation of the sensor float 8'. It is now possible to raise it. The control valve 6 is also provided with an operating arm 24 so as to contact the planting pin 16 from the rear when the spool 7 is in the neutral position.
is equipped with a spring ball type detent mechanism 25 that elastically positions and holds the inner wire 1 by the weight of the sensor float 8' and the spring 19 when the lever 22 is in the neutral position n.
The lever holding force of the detent mechanism 25 is set to be stronger than the tension of the detent mechanism 3a, and the spool 7 is prevented from being pulled out to the lowered position by restricting contact with the operating arm 24. Therefore, when the seedling planting device 4 is raised by operating the lever 22 to the raised position u and then returned to the neutral position n, the seedling planting device 4 remains held at the raised position. A restraining rod 28 is installed between a bracket 26 fixed to the outer cylinder shaft 21 and a rotation pin 27 attached to the lower link 3a of the parallel quadruple link mechanism 3, and a check rod 28 is installed between the bracket 26 fixed to the outer cylinder shaft 21 and the rotation pin 27 attached to the lower link 3a of the parallel quadruple link mechanism 3. Even if you switch to
When the lower link 3a rises to the set height, the rotation pin 27 pushes up the stopper 29 fixed to the rod 28 so that its position can be adjusted, forcibly rotates the outer cylinder shaft 21 forward, and moves the lever 22 to the neutral position. It is designed to automatically return to position n. And the neutral position n
The lever 22 returned to the original position is held by the detent mechanism 25 as described above, but in this case, if the forward swinging inertia of the lever 22 is large, it will cross over the detent mechanism 25 and enter the automatic range A. There is a risk of it entering. Therefore, in order to reduce the mass of this lever 22, it is constructed of hard plastic.

Further, the raising and lowering of the seedling planting device by the manual operation lever 22 and the driving stop of the seedling planting device 4 are linked as follows.

In other words, the traveling mission case 3 of the traveling aircraft 1
At the rear end of 0, there is a PTO shaft 33 for driving a seedling planting device whose power is intermittent via a jump clutch type torque limiter 31 and a meshing type planting clutch 32.
A clutch lever 35 fixed to the shift fork shaft 34 of the planting clutch 32 and the bracket 26 of the outer cylinder shaft 21 are connected via a curved link 36, a rod 37, and a spring 38 for absorbing stroke. When the lever 22 is operated to the automatic control position a, the planting clutch 32 is engaged by its own biasing force, and when the lever 22 is operated to the raised position u, the planting clutch 32 is disengaged. ing.

The lever 22 projects from a lever guide groove 40 formed in a cover 39 disposed at the bottom of the cockpit 5.
As shown in Figure 5, the straight path in the first half is located at the cockpit 5.
It is configured so that the straight path in the second half forms a lever path with a step that moves away from the cockpit 5, and when the operator seated in the cockpit 5 raises the seedling planting device 4, the straight path in the latter half moves away from the driver's seat 5. The lever 22 is moved away laterally so that it can be easily pulled toward the hand.

Furthermore, as shown in FIG. 5, the raising and lowering of the seedling planting device by the lever 22 and the on/off timing of the planting clutch are controlled by an automatic control valve operating system in which the control valve 6 is operated only by the sensor float 8'. Range A,
A neutral operation range N for keeping the control valve 6 in neutral and a forced rise operation range U are arranged in order from the front, and on the other hand, as for the planting clutch operation system, a clutch engagement range ON and a clutch disengagement range OFF are arranged at the boundary. A certain clutch engagement start position c is located in the middle of the automatic range A, and they are arranged in the front and rear. Further, the stepped portion of the lever guide groove 40 is also located within the automatic range A and within the clutch disengagement range OFF.
Further, the lever 22 itself is pivotally supported by the outer cylinder shaft 21 so as to be able to swing laterally, and is biased by a spring 41 to rotate slightly toward the side away from the driver's seat 5. Further, in the stepped portion of the lever guide groove 40, the side edge 40a on the side of the cockpit 5 is configured as a gently sloped step, and the side edge 40b on the opposite side is configured as a steep step with a recessed portion.

Therefore, the lever 22 is switched to the automatic position a to perform automatic control, and one stroke of planting travel is completed, and the lever 22 is moved to the raised position u to turn the machine at the edge of the field.
When the seedling planting device 4 is operated up to this point, the planting clutch 32 is first disengaged within the automatic range A where the seedling planting device 4 is in contact with the ground, and then the seedling planting device 4 is raised. Next, after completing the machine direction change and entering the next planting process, the lever 22 is switched from the neutral position n to the automatic position a, but in this case, the lever 22 operated forward is moved to the side edge 40b of the steep difference. Once it is locked, it is moved laterally to remove it from the side edge 40b and then operated forward, which takes some time to reach the engagement start position c. By this,
By the time the planting clutch 32 is engaged, the seedling planting device 4 is automatically lowered to the ground.

The shift fork shaft 34 of the planting clutch 32 is directly linked to a manual lever 41 separately provided near the bottom of the cockpit 5, and even when the seedling planting device 4 is raised and floated, this lever 41 cannot be operated. The planting clutch 32 can be engaged by pulling it up.

As detailed above in the embodiments, according to the present invention,
When the manual operation lever 22 is moved from the automatic range A to the raising operation range U in order to raise the seedling planting device 4 after one stroke of planting, the engagement start position of the planting clutch 28 is within this automatic range A. By the time the seedling planting device 4 is raised to pass through point c, the planting clutch 32 is reliably disconnected, and the seedlings will not be scattered in the air. Furthermore, when moving the manual operating lever 22 from the neutral operating range N to the automatic range A in order to lower and ground the lifted seedling planting device 4, it is positioned within the automatic range A and within the planting clutch disengagement range OFF. The seedling planting device 4 can be automatically lowered to the ground by the time it reaches the planting clutch engagement start position c due to the lever operation time when passing through the stepped portion of the lever path, and here as well, the seedlings can be scattered in the air. It is possible to prevent this.

In other words, in making it possible to operate the planting clutch 32 with the manual operation lever 22 for raising and lowering the seedling planting device, the present invention is designed to rationalize the operating range of the raising and lowering system of the seedling planting device and the on/off range of the planting clutch. By adjusting the settings and setting the level difference in the lever path, it became possible to properly time the raising and lowering of the seedling planting device and the on/off timing of the planting clutch.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the operating device for a riding rice transplanter according to the present invention, in which FIG. 1 is an overall side view of the rice transplanter, FIG. 2 is an overall plan view, FIG. 3 is a configuration diagram of the control mechanism, and FIG. Figure 4 is a vertical cross-sectional rear view of the control valve operation section, and Figure 5
This figure is a plan view of the manual operation lever guide part, and FIG. 6 is a side view showing the connection between the manual operation lever and the planting clutch. 2... Hydraulic cylinder, 4... Seedling planting device, 6...
...control valve.

Claims (1)

[Claims for Utility Model Registration] In order to maintain the ground pressure of the sensor float 8' provided in the seedling planting device 4 within a set range, the device is used for raising and lowering the seedling planting device based on the detection of the ground pressure of the sensor float 8'. A forced lift operation range U configured to switch the control valve 6 of the hydraulic cylinder 2 and switch the control valve 6 to a raised position of the seedling planting device; a neutral operation range N holding the control valve 6 neutral; An operating lever 22 that can be switched sequentially by a series of back and forth rocking operations is provided in the automatic range A in which the control valve 6 is operated only by the sensor float 8', and this operating lever 22 and the seedling planting device 4 The meshing type planting clutch 28 for intermittent power supply is linked, the engagement start position C of this planting clutch 28 is set in the middle of the automatic range A, and the lever is moved from this position C to the side of the upward operation range U. The swing range is set to OFF the clutch disengaged range, and the lever swing range to the opposite side is set to the clutch engaged range ON.
and a step is formed in a lever path portion corresponding to the middle between the engagement start position C and the neutral operation range N, and the lever paths before and after the step are formed into mutually parallel linear paths. Rice transplanter operating device. The operation according to the utility model registration claim, wherein the stepped operation path of the manual operating lever 22 is set such that a portion in front of the stepped portion is close to the pilot seat 5 and a portion behind the stepped portion is set far from the pilot seat 5. Device.