JPH0341122B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a ground sensor that moves up and down as the planting device moves up and down, and a ground sensor that moves up and down as the planting device moves up and down. The present invention relates to a rice transplanter that is equipped with a mechanism that moves the rice transplanter up and down so that the rice transplanter is maintained within a set range.

In such a rice transplanter, when turning the machine at the edge of a field, it is necessary to raise the planting device in order to reduce the disturbance of the mud surface and the turning resistance caused by the sliding contact of the planting device's ground float. When lifting the planting device manually as in the past, the planting device often ends up being raised to an unreasonable height.
As a result, it takes time to lower the planting device after turning the aircraft and to be able to start the intended planting work, resulting in a significant drop in work efficiency.

Therefore, conventionally, as disclosed in Japanese Patent Application Laid-Open No. 56-106511 and Japanese Patent Publication No. 56-109510, an operating mechanism has been provided to reduce the sensing load of the ground sensor to zero or a value close to it. , when the aircraft was turning, a method was adopted to lower the sensor-sensed load and raise the planting device to the minimum level necessary for the ground contact part to float above the ground via the drive lifting mechanism. Although it is possible to prevent the planting device from rising more than necessary, if the ground sensor moves downward due to a depression in the mud surface or due to clumsy operation of the machine, the lowering movement of this sensor will be linked. This has the drawback that the planting device is lowered, and the intended effect of raising the planting device above the ground is uncertain.

SUMMARY OF THE INVENTION In view of the drawbacks detailed above, an object of the present invention is to ensure that the planting device can be raised to the minimum necessary extent during a turn of the aircraft.

The rice transplanter according to the present invention is characterized in that it is provided with an operating mechanism that reduces the sensed load of the sensor, and a mechanism that can switch the drive lifting mechanism between a state in which the lowering of the planting device is restrained and a state in which the restraint is released. shall be.

In other words, by providing an operating mechanism to reduce the sensing load of the sensor, the amount of rise of the planting device when the aircraft turns is to be minimized.
The biggest feature is that by providing the above-mentioned check mechanism, when the aircraft turns, the planting device is allowed to rise in conjunction with the rising movement of the sensor, and the mud surface is prevented from being disturbed by the ground contact part of the planting device. The present invention is designed to prevent the planting device from descending in conjunction with the descending movement of the sensor, while also preventing an increase in turning resistance.
According to the present invention, the planting device can be reliably raised to the minimum necessary extent when the aircraft turns, and the aircraft can be turned smoothly, favorably, and reliably.

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

A prime mover 3 is connected to the front part of a fuselage frame 2 equipped with running wheels 1 that can freely swing up and down, and a planting device 4 with a ground leveling float 4A is connected to the rear part of the body frame 2. As the planting device 4 moves up and down due to the vertical displacement of the wheels 1, the front fulcrum R
A float-like ground sensor 5 that swings up and down around the ground sensor 5 is provided, and in conjunction with the detection swing of this sensor 5, the wheels 1 are controlled so that the height of the planting device 4 relative to the mud is maintained within a set range. A walking rice transplanter is constructed by providing a mechanism 6 for driving up and down and a steering handle 7. The ground sensor 5 also serves as a ground leveling float.

The driving elevating mechanism 6 uses a hydraulic cylinder 6A as a wheel elevating actuator, and by swinging, a switching valve 6B for the hydraulic cylinder 6A is activated.
A link 6C for switching operation, a rod 6D for linking this link 6C with the sensor 5, and a sensing load setting spring 6E for swinging and biasing the link 6C in the wheel upward direction.

To explain the operation of this drive elevating mechanism 6, when the plowing depth becomes deeper (shallower), the sensor 5 swings up (down) with respect to the machine frame 2, and switches via the rod 6D and link 6C. The valve 6B is switched to the wheel lowering position (wheel raising position), the wheel 1 is lowered (raised), the body frame 2, that is, the planting device 4 is raised (lowered), and the planting device 4 is raised ( (descending), the sensor 5 detects the fuselage frame 2.
The sensor 5 swings downward (upward) against the aircraft frame, and due to this downward (upward) swinging of the sensor 5, the swinging attitude of the sensor 5 with respect to the aircraft frame returns to the set attitude, thereby causing the switching valve 6B to Switching to the lifting stop position (neutral position), the lowering (raising) of the wheels 1 is stopped, and the height of the planting device 4 relative to the mud, that is, the planting depth becomes the set value.

Reference numeral 8 designates a main clutch operating lever that engages and closes the main clutch by moving along a linear groove 10 formed in an operating box 9 attached to the steering handle 7; This is an operating lever that is movable along two linear grooves 12, 12' formed so as to be connected at one end 1 of one groove 12.
2a, the planting clutch is disengaged and actuated, and by being located at the other end 12b of one groove 12, the planting clutch is engaged and actuated, and the planting clutch is placed at one end 12a' of the other groove 12'. By doing so, at the same time as the planting clutch is cut and operated, the switching valve 6B in the drive lifting mechanism 6 is switched to the wheel lowering position (planting device raising position) with priority over the sensor 5, and the other groove By being located at the other end 12b' of the groove 12', the planting clutch is engaged and actuated, and at the same time, the operation on the switching valve 6B is released, and the intermediate part 12 of the other groove 12' is
c', the planting clutch is disengaged and actuated, and at the same time, the switching valve 6B is switched to the neutral position in a state that allows switching to the wheel lowering position in conjunction with the sensor 5. It is linked to the clutch and the switching valve 6B. Reference numeral 13 denotes a member that can freely contact and release the movement of the operating lever 11 between the grooves 12 and 12'.

The linkage mechanism between the operating lever 11 and the switching valve 6B is such that the operating lever 11 is linked to the operating lever 11 via a wire 14, and the operating lever 11 is connected to the groove 12' at one end 12.
a', the link 6C is prevented from swinging from the wheel up position to the neutral position and the wheel down position, and the operating lever 11 is moved to the groove 12' intermediate part 12.
c', the link 6C is allowed to swing from the neutral position to the wheel up position, but is prevented from swinging from the neutral position to the wheel down position, and the operating lever 11 is in contact with the groove 12'. A connecting link 15 is provided at the end to release the contact with the link 6C when positioned at 12b'.

Thus, an operating mechanism 16 is provided to reduce the load sensed by the sensor 5, that is, the downward biasing force by the spring 6E, and a state in which the lowering movement of the planting device of the drive elevating mechanism 6 is restrained and a state in which the restraint is released are provided. A check mechanism 17 that can be switched freely is provided.

The operating mechanism 16 is linked to the operating lever 11 via a wire 18, and the operating mechanism 16 is connected to the operating lever 11 via a wire 18.
1, the end of the spring 6E that acts on the link 6C is reversibly separated from the link 6C against the elastic force of the spring 6E.
A swinging member 16A is provided to cut off the action of E on the sensor 5.

The check mechanism 17 has the operation box 9
An engaging portion 17a that engages and holds the operating lever 11 in the neutral position is provided, and by engaging the operating lever 11 with the engaging portion 17a, the planting device 4 is connected via the link 15. It is configured to restrain the lowering, that is, the upward movement of the wheel 1, and to release the restraint by disengaging the operating lever 11 from the engagement portion 17a and operating it to the wheel raising position. In other words, the configuration utilizes the configuration for linking the operating lever 11 with the switching valve 6B as described above.

According to the above embodiment configuration, by engaging the operating lever 11 with the engaging portion 17a prior to turning the aircraft, the load sensed by the sensor 5 is reduced, the planting device 4 is restrained from descending, and the planting device 4 is activated. A stop occurs. And, due to the decreased sensing load,
When the front part of the aircraft is lowered by lifting the control handle 7, or even if it is not lowered, the sensor 5 swings upward due to the ground reaction force, the switching valve 6B is switched to the wheel lowering position, and the wheel 1 is lowered. When the planting device 4 is lowered and the planting device 4 is raised, and the sensor 5 is swung to the aircraft frame attitude or the set attitude due to the lowering of the wheels 1, the switching valve 6B is switched to the neutral position and the wheels 1
The lowering of the planting device 4 is stopped, and the raising of the planting device 4 is stopped, so that the planting device 4 does not disturb the mud surface or increase the turning resistance as it turns. It will be located at the lowest vertical position. In addition, in such a raised state of the planting device, if the sensor 5 swings downward due to the sensor 5 falling into the concave part of the mud surface or the wheel 1 running onto the convex part of the tiller, etc. When the device 4 does not descend, but the sensor 5 swings upward due to the sensor 5 riding on a convex part of the mud surface or the wheel 1 falling into a concave part of the tiller, the frame attitude of the sensor 5 relative to the aircraft is set. The wheel 1 is lowered until it assumes the posture, and the planting device 4 is raised.

As shown in FIG. 4, the operating mechanism 16 may be one that uses a swinging member 16A' to change the position of the end of the spring 6E that acts on the fixed portion, thereby reducing the sensed load.

In the above embodiment, the planting clutch operation, the raising and lowering operation of the planting device, the sensing load reduction operation, and the restraining operation are configured to be performed using one operating lever 11, and the operability is improved. The present invention may be implemented by performing each of the above operations separately.

In addition to the walking-type rice transplanter shown in the embodiment, examples of the rice transplanter to which the present invention is applied include a riding rice transplanter.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment, Figure 1 is a side view, Figure 2 is an enlarged side view of the main part, Figure 3 is an enlarged rear view of the main part, and Figure 4 is another embodiment. FIG. 4... Planting device, 5... Sensor, 6... Driving elevating mechanism, 16... Operating mechanism, 17... Checking mechanism.

[Claims]

1. In one in which a sensing valve senses the levitation force applied to a float to control the elevation of a planting work machine, and the operating sensitivity of the sensing valve is adjusted by a sensitivity adjustment means, the sensing valve is controlled by the sensitivity adjustment means. The sensing valve is characterized by comprising locking means operated by the sensitivity adjusting means to lock the operation of the sensing valve before the sensing valve is switched to the pressurized position when the sensitivity of the sensing valve is attenuated to the maximum. Operation control method for rice transplanter.