JPH0330607A - Traveling transmission structure of paddy field work equipment - Google Patents

Abstract

PURPOSE:To prevent the lift of the front part of a working machine by providing a means for changing the following work speed of a speed-change actuator toward the low speed side according to the change of a control sensitivity. CONSTITUTION:The operated position of a control sensitivity lever 16 is detected by a potentiometer 27 and the signal is inputted to a controller 25. When the control sensitivity lever 16 is in the low sensitivity side, the following work speed of a motor-operated cylinder 22 is changed to a low speed side even if a speed change lever 23 is operated to the high speed side. Accordingly the motor-operated cylinder 22 is relatively slowly extended or contracted with a time lag.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a traveling speed change structure in a paddy field working machine such as a riding rice transplanter or a paddy field direct sowing machine.

[Conventional technology]

In a riding rice transplanter, which is one type of rice field work equipment, the operating position of a gear shift lever (equivalent to a manual operating tool) is detected using a potentiometer, etc., and the gear shift state corresponds to the operating position of the gear shift lever. It has been proposed to include an actuator that changes the speed of the transmission for driving.

[Problem to be solved by the invention]

With the above-mentioned configuration, the gear shift lever can be operated easily and quick gear changes are possible, but especially when the mud in the rice fields is hard, the gear shift lever can be suddenly operated to the high speed side, causing a sudden start or sudden acceleration. If the situation occurs, the following phenomena may occur.

In other words, if the mud is hard, the reaction force that the wheels receive from the mud when the wheels are rotated will be large, so if the wheels are suddenly driven, the front of the aircraft will be lifted by the reaction force from the mud. This phenomenon causes problems in terms of safety and riding comfort. Also, during work, the working part at the rear of the machine lowers rapidly due to the sudden front roll of the machine, and sometimes the planting depth and sowing depth become excessively deep.

The present invention aims to suppress the phenomenon in which the front part of the aircraft body is lifted as described above.

[Means to solve the problem]

The feature of the present invention is that the traveling speed change structure of the rice paddy working machine as described above is configured as follows.

In other words, an actuator that changes the speed of the traveling transmission to a speed change state corresponding to the operating position of the human operating tool, an elevation control means that raises and lowers the ground work equipment to maintain it at a set height from the field surface, and and control sensitivity changing means for changing the control sensitivity of the control means, and in conjunction with the operation of changing the control sensitivity to the insensitive side by the control sensitivity changing means, the follow-up operation speed of the actuator to the speed increasing operation side is changed. The automatic change means for changing to the lower speed side is provided, and its functions and effects are as follows.

[Function] In general, paddy field work equipment includes a lifting control means for raising and lowering the ground working device to maintain it at a set height from the rice field surface, and a control sensitivity changing means for changing the control sensitivity of this lifting control means. If the mud in the paddy field is hard, the control sensitivity will be switched to the insensitive side. This is because when the mud in a paddy field is hard, many mud clumps are scattered on the field surface, making the field surface extremely uneven. This is because when the ground work device is lifted or lowered, a hunting phenomenon occurs in which the ground work device vibrates up and down.

Therefore, when the control sensitivity is switched to the insensitive side, the follow-up operation speed of the actuator toward the speed increase operation side is automatically operated to the low speed side, so even if the manual operation tool is suddenly operated to the high speed side, the transmission will not change. After a delay, the speed is increased relatively slowly to the speed change state corresponding to the operating position of the human operating tool. In this way, when the mud is hard, the transmission can be operated to increase the speed slowly (thereby, the phenomenon of the front of the aircraft being lifted can be suppressed).

〔Effect of the invention〕

As described above, even if the manual operation tool is accidentally operated suddenly to the high speed side in hard paddy mud conditions, the front part of the machine will not be lifted up, which will improve the safety of rice field work machines. At the same time, it has become possible to suppress an excessive increase in the working depth due to sudden lifting of the front of the machine, and to perform work at a uniform working depth.

Since changing the control sensitivity in raising and lowering the ground work equipment is one of the operations that is naturally performed automatically or manually, the configuration is such that the follow-up operation speed of the actuator is automatically changed in accordance with this change in control sensitivity. Therefore, when the mud in the paddy field is hard, there is no possibility of forgetting to change the follow-up operation speed of the actuator, and this is practically useful in terms of ease of handling.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, an embodiment of the present invention will be explained based on the drawings using a riding type rice transplanter which is one of rice field working machines.

As shown in Figure 2, the engine (3) and gear transmission transmission (4) are located at the front of the aircraft, supported by the front wheels (1) and rear wheels (2), and the control unit (5) is located at the center of the aircraft. A riding type rice transplanter is provided with a seedling planting device as a ground work device (6) at the rear of the machine body. This seedling planting device (6) is composed of a seedling stand (7), a planting arm (8), etc.
It is connected to a four-speed link mechanism (9) extending from the fuselage, and is configured to be able to be raised and lowered by a hydraulic cylinder (10).

Next, the elevation control for maintaining the seedling planting device (6) at a set height above the rice field (G) will be described in detail. As shown in Fig. 1, a grounding flow (11) is attached to the seedling planting device (6) so as to be able to swing up and down around the horizontal axis (Pl), and the hydraulic cylinder (10) is equipped with hydraulic oil. The control valve (12) for supplying and discharging the water and the front part of the ground float (11) are connected to the rod (
26), a bell crank (
13) and a link mechanism (14).

With the above structure, when the seedling planting device (6) moves up and down with respect to the grounding float (11) that follows the grounding on the circular surface (G), the control valve (12) is switched by the movement, The seedling planting device (6) is connected to the rice field (G) and the ground flow t-(
11), the hydraulic cylinder (10) is expanded and contracted to raise and lower the seedling planting device (6).

Next, changing the control sensitivity in the above-mentioned elevation control will be described in detail. As shown in Figure 1, the ground float (11)
A spring (15) that urges the bell crank (13) to swing downward is attached to the bell crank (13), and the control sensitivity lever (16) and the spring (15) are connected via a wire (17).

With the above structure, when the control sensitivity lever (16) is operated to the insensitive side, the wires (17) are pulled toward the control sensitivity lever (16), the biasing force of the spring (15) is strengthened, and the grounding flow (11) is It becomes difficult to move up and down.

This is a state where control sensitivity is insensitive. Conversely, when the control sensitivity lever (16) is operated to the sensitive side, the spring (15)
The biasing force of is weakened, making it easier for the grounding float (11) to move up and down. This is a sensitive state of control sensitivity. or,
The control sensitivity lever (16) is provided with a lever guide (18) that can hold it at any position.

Next, the traveling speed change of this riding type rice transplanter will be explained in detail.

As shown in Figure 1, power from the engine (3) is transmitted to the transmission (4) via a belt-type continuously variable transmission (19) using a split pulley, and from this transmission (4) to the front wheels (1). , the power is transmitted to the rear wheels (2) and the seedling planting device (6). A tension pulley (21) is attached to one end of the arm (20) that can freely swing around the horizontal axis (P3), and an actuator (21) is attached to the other end of the arm (20).
2) An electric cylinder is installed.

On the other hand, the control section (5) is equipped with a gear shift lever as a human operating tool (23), and this gear shift lever (23)
A signal from a potentiometer (24) that detects the operating position of is input to the control device (25). As a result, the electric cylinder (22) is expanded or contracted to correspond to the operating position of the gear shift lever (23), and the belt type continuously variable transmission (19) is operated by the tension pulley (21).
) is shifted to a gear state corresponding to the operating position of the gear shift lever (23).

The operating position of the control sensitivity lever (16) is detected by a potentiometer (27), and the signal thereof is input to the control device (25). As a result, when the control sensitivity lever (16) is operated to a more sensitive side than the neutral position, the electric cylinder (22) is quickly expanded or retracted without delaying the operation of the speed change lever (23). When the control sensitivity lever (16) is operated to the less sensitive side than the neutral position, when the gear shift lever (23) is operated from one operating position to another operating position on the high speed side, the electric The cylinder (22) is extended and retracted relatively slowly with a delay to the position corresponding to the operating position on the high speed side.

[Another example]

In the above-mentioned embodiment, the control sensitivity of the elevator was changed manually using the control sensitivity lever (16), but this may be configured to be changed automatically as shown in FIG. .

In other words, a sled-shaped mud hardness sensor (28) is attached to the ground float (11) so as to be able to swing up and down around the horizontal axis (P), and this mud hardness sensor (28) and a spring (15) The displacement of the wire (29) is detected by the potentiometer (30), and the signal is sent to the control device (25).
) is entered. As a result, if the mud on the field (G) is hard, the mud hardness sensor (28) swings upward and pulls the wire (29), increasing the biasing force of the spring (15), and its operation is controlled. The signal is input to the device (25) and the follow-up operating speed of the electric cylinder (22) is changed as described above.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of a traveling transmission structure for a paddy field working machine according to the present invention, and FIG. 1 shows a state of cooperation between a traveling transmission, an elevation control means, and a control sensitivity changing means, and FIG. FIG. 3, which is an overall side view of the type rice transplanter, is a diagram showing the state of cooperation between the transmission for traveling, the elevation control means, and the control sensitivity changing means in another embodiment. (6)...Ground work equipment, (19)...
・Transmission device for traveling, (22)... actuator, (23)... human operating tool.

Claims (1)

[Claims] An actuator (22) that changes the speed of the traveling transmission (19) to a speed change state corresponding to the operating position of the human operating tool (23) and a ground work device (6) that maintains it at a set height from the field surface. The actuator (
22) A traveling speed change structure for a paddy field working machine, which is equipped with an automatic change means for changing the follow-up operation speed to the speed increasing operation side to the lower speed side.