JPH078164B2 - Paddy work machine traveling speed change structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a traveling speed change structure in a paddy field working machine such as a riding type rice transplanter or a direct rice seeder.

[Conventional technology]

In a riding-type rice transplanter, which is one of the paddy work machines, the operation position of a speed change lever (corresponding to an artificial operation tool) for speed change operation is detected by a potentiometer or the like, and a speed change state corresponding to the operation position of the speed change lever is detected. In addition, it has been proposed to provide an actuator that shifts a transmission for traveling.

[Problems to be Solved by the Invention]

With the above-mentioned configuration, the gear shift lever can be operated lightly and quick gear shift operation is possible.However, especially when the mud of the paddy field is hard, the gear shift lever is operated rapidly to the high speed side to accelerate or accelerate suddenly. In such a situation, the following phenomenon may occur.

In other words, if the mud is hard, the reaction force that the wheels receive from the mud will also be large when the wheels for traveling are rotated, so that if the wheels are driven suddenly, the reaction force from the mud will lift the entire body. This brings about various phenomena, and causes problems in terms of safety and riding comfort. In addition, during work, the working section at the rear of the machine lowers rapidly as the machine rapidly rises, and the planting depth and seeding depth temporarily become excessively deep.

An object of the present invention is to suppress the phenomenon that the front part of the machine body is lifted as described above.

[Means for Solving the Problems]

The feature of the present invention resides in that the traveling speed change structure of the paddy field work machine as described above is configured as follows. That is, an actuator that shifts the transmission for traveling to a shift state corresponding to the operation position of the manual operation tool, a lifting control unit that lifts and lowers the ground work device so as to maintain the ground work device at a set height, and the lifting and lowering device. The control sensitivity changing means for changing the control sensitivity of the control means is provided, and in conjunction with the change operation to the control sensitivity insensitive side by the control sensitivity changing means, the follow-up operation speed of the actuator to the speed increasing operation side is set. It is provided with an automatic changing means for changing to a low speed side, and its operation and effect are as follows.

[Work]

Generally, paddy work machines are provided with an elevating control means for elevating and lowering the ground work device to maintain a set height from the rice field, and a control sensitivity changing means for changing the control sensitivity of the elevating control means. If the mud in the paddy field is hard, switch the control sensitivity to the insensitive side. This is because if the mud in the paddy field is hard, many mud lumps are scattered on the surface of the paddy field and the unevenness of the paddy field is severe. This is because a hunting phenomenon occurs in which the ground work device vibrates up and down when the lifting operation is performed.

Therefore, when the control sensitivity is switched to the insensitive side, the operation speed of the actuator following the speed-up operation side is automatically operated to the low speed side. After that, the speed-up operation is relatively slowly performed to the shift state corresponding to the operation position of the manual operation tool. As described above, when the mud is hard, the phenomenon that the front part of the machine body is lifted can be suppressed by slowly increasing the speed of the transmission.

〔The invention's effect〕

As described above, even if the manipulator is accidentally operated suddenly to the high speed side when the mud in the paddy field is hard, the phenomenon in which the front part of the machine is lifted is reduced and the safety of the paddy work machine is improved. In addition to being able to achieve this, it has become possible to perform work with a uniform working depth by suppressing an excessive increase in working depth associated with the sudden lifting of the front part of the machine body.

Further, since the control sensitivity change in the raising / lowering operation of the ground work device is one of the operations naturally performed automatically or manually, the follow-up operation speed of the actuator accompanying this control sensitivity change is automatically changed. Therefore, when the mud of the paddy field is hard, there is no need to forget to change the operation speed of the actuator, which is useful in terms of handling.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings using a riding type rice transplanter which is one of the paddy field working machines.

As shown in FIG. 2, an engine (3) and a gear-shifting type transmission (4) are provided at the front of the airframe supported by front wheels (1) and rear wheels (2), and a control section (5) is provided at the center of the airframe. A riding type rice transplanter is provided with a seedling planting device as a ground working device (6) at the rear part of the machine body. This seedling planting device (6) comprises a seedling stand (7), a planting arm (8), etc.
The hydraulic cylinder (10) is connected to a four-link mechanism (9) extending from the machine body and is configured to be lifted and lowered.

Next, the elevation control for maintaining the seedling planting device (6) at the set height from the rice field (G) will be described in detail. As shown in FIG. 1, a grounding float (11) is attached to the seedling planting device (6) around a horizontal axis (P ₁ ) so as to be vertically swingable, and hydraulic oil is attached to the hydraulic cylinder (10). Control valve for supplying and discharging (12)
And the front part of the grounding float (11) are interlockingly connected via a rod (26), a bell crank (13) swinging around a horizontal axis (P ₂ ) 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 ground contact with the rice field (G), the operation causes the control valve (12) to be switched and the seedlings to be grown. The hydraulic cylinder (10) so that the planting device (6) maintains the set height with respect to the rice field (G) and the ground float (11).
Is expanded and contracted, and the raising and lowering operation of the seedling planting device (6) is performed.

Next, the change of the control sensitivity in the above-mentioned elevation control will be described in detail. As shown in FIG. 1, a spring (15) for urging the grounding float (11) toward the downward swing side is attached to the bell crank (13) and the control sensitivity lever (16) is attached.
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 wire (17) is pulled to the control sensitivity lever (16) side, the biasing force of the spring (15) is strengthened, and the ground float (11) It becomes difficult to move up and down. This is a state in which the control sensitivity is insensitive. On the contrary, when the control sensitivity lever (16) is operated to the sensitive side, the biasing force of the spring (15) is weakened, and the grounding float (11) easily moves up and down. This is a sensitive state of control sensitivity. Further, the control sensitivity lever (16) is provided with a lever guide (18) capable of holding it at an arbitrary position.

Next, the traveling speed change of this riding type rice transplanter will be described in detail.
As shown in FIG. 1, the power from the engine (3) is transmitted to the mission (4) via a belt type continuously variable transmission (19) using a split pulley, and from this mission (4) to the front wheels (1). The power is transmitted to the rear wheel (2) and the seedling planting device (6). Then, a tension pulley (21) is attached to one end of an arm (20) swingable around the horizontal axis (P ₃ ) and an electric cylinder as an actuator (22) is attached to the other end of the arm (20). .

On the other hand, the control section (5) is provided with a speed change lever as an artificial operation tool (23), and a signal from a potentiometer (24) for detecting the operation position of the speed change lever (23) is supplied with a control device (25). ) Has been entered. As a result, the electric cylinder (22) is expanded and contracted so as to correspond to the operation position of the speed change lever (23), and the tension pulley (21) causes the belt type continuously variable transmission (19) to move to the speed change lever (23). That is, the gear shift operation is performed to the gear shift state corresponding to the operation position of.

The operation position of the control sensitivity lever (16) is detected by the potentiometer (27), and the signal is input to the control device (25). As a result, when the control sensitivity lever (16) is operated to be more sensitive than the neutral position, the electric cylinder (22) is quickly expanded and contracted without delaying the operation of the speed change lever (23). When the control sensitivity lever (16) is operated to the insensitive side of the neutral position, when the speed change lever (23) is operated from one operation position to another operation position on the high speed side, Cylinder (2
In 2), while being delayed, it is relatively slowly expanded and contracted to the position corresponding to the operation position on the high speed side.

[Another embodiment]

In the above-described embodiment, the control sensitivity change of the ascending / descending control is artificially performed by the control sensitivity lever (16), but this may be automatically performed as shown in FIG.

In other words, the sled-like mud hardness sensor (28) is attached so that it can swing up and down around the horizontal axis (P ₄ ) of the ground float (11), and this mud hardness sensor (28) and spring (1)
5) and 5) are connected via a wire (29), the displacement of the wire (29) is detected by a potentiometer (30), and the signal is input to a control device (25). As a result, if the mud on the paddy field (G) is hard, the mud hardness sensor (28) swings upward to pull the wire (29) and strengthen the urging force of the spring (15). This is input to the device (25) and the following operation speed of the electric cylinder (22) is changed.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a traveling speed change structure of a paddy work machine according to the present invention, FIG. 1 is a view showing a linked state of a speed change device for traveling, an elevating control means and a control sensitivity changing means, and FIG. FIG. 3 is an overall side view of a model rice transplanter, and FIG. 3 is a view showing a linked state of a traveling transmission, an elevation control means, and a control sensitivity changing means in another embodiment. (6) …… Ground work device, (19) …… Traveling transmission, (22) …… Actuator, (23) …… Human operated tool.

Claims (1)

[Claims] 1. An actuator (22) for shifting a traveling transmission (19) to a shifting state corresponding to an operation position of an artificial operating tool (23) and a ground work device (6) set height from a field. And a control sensitivity changing means for changing the control sensitivity of the elevating control means, and is linked to the operation of changing the control sensitivity to the insensitive side by the control sensitivity changing means. Then, the traveling speed change structure of the paddy work machine is provided with automatic changing means for changing the follow-up operation speed of the actuator (22) to the speed increasing operation side to the low speed side.