JP2883138B2 - Hydraulic sensitivity adjustment device in paddy working machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hydraulic sensitivity adjustment device for a paddy working machine such as a rice transplanter, a seeder, and a fertilizer.

[Problems to be Solved by the Prior Art and the Invention] In general, in this kind of paddy working machine, a paddy working section, which is mounted on a traveling body so as to be able to move up and down, has a paddle attitude, and a sensing float provided on the paddy working section. By switching the hydraulic operation mechanism based on the sensing operation, the hydraulic pressure raising / lowering control is performed so as to keep the hydraulic pressure substantially constant.

By the way, in such a thing, if the hydraulic pressure is increased by increasing the engine speed by, for example, adjusting the throttle, etc., the lifting and lowering work of the paddy field working part for the sensing of the surface of the sensing float becomes too fast, and the working accuracy is returned. descend. For this reason, it has been conventionally proposed to automatically adjust the hydraulic sensitivity based on the hydraulic discharge amount adjustment, and there are some attempts.

However, in the prior art, it is a fact that the hydraulic sensitivity adjustment is performed on the paddy working section side and the lifting link mechanism side, and when the former is performed on the paddy working section side, the adjustment to the paddy working section is performed. The distance is too long, so the power loss due to the operating resistance in the middle is large, and a large operating force is required to perform the hydraulic discharge amount adjustment operation, which not only impairs the operability but also makes it impossible to switch the sensitivity with high precision. There's a problem. On the other hand, when performing on the latter lifting link mechanism side,
Although it is somewhat shorter, the power loss is reduced, but in this case, the relative position (height) of the paddy field working unit with respect to the traveling machine body changes based on the depth of the cultivator, and the link angle of the lifting link mechanism changes. There is a disadvantage that the hydraulic sensitivity changes due to the change in the link angle, and the sensitivity adjustment is not stable.

Means for Solving the Problems In view of the above-described circumstances, the present invention has been created with the object of providing a hydraulic sensitivity adjustment device in a paddy working machine that can eliminate these disadvantages, A hydraulic body based on the sensing surface of the sensing float is linked to a connecting body interlockingly linked to a hydraulic switching device for switching the hydraulic operating mechanism and a rocking body swinging in conjunction with the sensing surface of the sensing float. A hydraulic interlocking unit that extends from a hydraulic adjustment mechanism that adjusts the hydraulic discharge rate is used in a moisture work machine that controls the hydraulic pressure of the paddy working unit so that the rice field posture of the paddy working unit is maintained substantially constant by switching the operating mechanism. In a configuration in which the swinging body is interlocked with the swinging body while being supported by the above-described linked body and the hydraulic sensitivity is adjusted in response to the hydraulic discharge amount adjustment operation, a hydraulic pressure is applied between the swinging body and the linked body. Vomit The swing mechanism is tensioned in the direction opposite to the pulling operation direction of the swing body by the output adjustment operation, and a maintenance mechanism for maintaining the swing body at the discharge amount adjustment corresponding position is interposed. An accommodating mechanism for accommodating the movement corresponding to the discharge amount adjustment is provided, and the maintaining position of the oscillator with respect to the connected body is moved to a side where the hydraulic sensitivity is reduced when the hydraulic discharge amount is increased. It is assumed that.

According to the present invention, with this configuration, the hydraulic discharge amount can be easily adjusted and the sensitivity can be stably adjusted.

Example Next, an example of the present invention will be described with reference to the drawings.
In the drawings, 1 is a traveling type of a riding type rice transplanter,
At the rear of the traveling machine body 1, a planting work section 3 is provided via a lifting link mechanism 2. This planting work section 3
It is the same as in the related art that the apparatus is configured using member devices such as the paddy surface sensing float 4, the seedling mounting table 5, the planting claw 6, and the like. Further, the traveling body 1 is conventionally formed using member devices such as a driver's seat 7, a steering wheel 8, traveling wheels 9, and a hood 10 which houses an engine. The front side of the sensing float 4 swings up and down with the support shaft 4a as a fulcrum, and a link connected to the front part is provided.
4b is pivotally connected to the rear end of the float connection rod 11.

On the other hand, a sensitivity adjustment lever 12 is provided on the side of the driver's seat 7, and the boss portion of the sensitivity adjustment lever 12 is swingable in the front-rear direction by a support shaft 13 supported on the body frame 1a. Boss plate 12a, which is pivotally supported by the bracket, a bracket 12b which is integrally fixed to one end (upper end) of the plate 12a, and a base which is pivotally supported on the bracket 12b via a support shaft 12c so as to be swingable in the left-right direction. 12d, and the adjustment lever 12 is formed to protrude upward from the base 12d. The adjustment lever 12 swings in the front-rear direction with the support shaft 13 as a fulcrum, and can perform a sensitivity adjustment operation according to a sensitivity adjustment guide 14 as described later. The sensitivity adjusting guide 14 is configured to be able to engage and disengage with a guide groove 14a provided in the sensitivity adjusting guide 14.

Reference numeral 15 denotes a swinging plate that is swingably supported at the other end (lower end) of the boss plate 12a via a support shaft 15a. The swinging plate (the "swinging body" of the present invention) An operating shaft 15b protrudes from the lower end of the corresponding (corresponding to) 15, and an elongated hole 11a formed in the front plate of the float connecting rod 11 is loosely fitted to the operating shaft 15b. A pin 15c is implanted at the upper end of the swinging plate 15. The pin 15c has a throttle wire (an "hydraulic interlocking body" of the present invention) connected to a throttle lever 16 for adjusting the engine speed. The outer end 17a of the throttle wire 17 is integrally attached to the front end of the operating plate 18. Slots 18a and 18b are formed in both front and rear sides of the operation plate 18, and the pin 15c is fitted in the rear slot 18b so as to be movable in the front-rear direction. And, between the pin 15c and the rear end bent portion 18c of the operation plate 18, a maintenance elastic machine 19 constituting the maintenance mechanism of the present invention is interposed. Further, a connecting rod 20 is provided at the front end of the operating plate 18.
The rear end of the connecting rod 20 is integrally connected, and the front end of the connecting rod 20 is operatively connected to a hydraulic switching arm (hydraulic switching tool) 21. In this embodiment, the connecting rod 20 and the operating plate
18 together constitute the "connected body" of the present invention. The hydraulic switching arm 212 is provided with a return elastic unit 21a having a smaller urging force than the maintenance elastic unit 19.

Reference numeral 22 denotes a planting operation lever. The planting operation lever 22 is connected to the body frame 1a via a connecting rod 23 by a support shaft 24.
A pin 24b projecting from the planting operation plate 24 is loosely fitted into a front long hole 18a of the operation plate 18 by being linked to a planting operation plate 24 pivotally supported via a.

When the planting operation lever 22 is set from the neutral position to the automatic planting position, for example, in a state where the working unit 3 is raised, the pin 24b which moves backward contacts the long hole 18a with the rear end to operate. The plate 18 is pushed backward, whereby the hydraulic switching arm 21 swings to switch the hydraulic switching valve (not shown) to the working unit lowering side, and the working unit 3 is lowered. When the sensing float 4 comes into contact with the rice field surface with the lowering of the working unit 3 and the relative attitude of the sensing float 4 with respect to the working unit 3 moves upward, the float connecting rod 11 moves backward,
The operating shaft 15b comes into contact with the front end of the long hole 11a, and the swing plate 15 is swung so that the upper end moves forward with the support shaft 15a as a fulcrum.

On the other hand, the oscillating plate 15 and the operating plate 18 are provided with a strong retaining force (corresponding to the “maintenance mechanism”) 19 of the present invention.
Is inserted between them, and the slot wire 17 supports the pin 15c of the operation plate 15 in a tensioned state, so that the pin 15c is set at an appropriate halfway position of the long hole 18b without being moved. That is, as described above, when the swing plate 15 swings, the operating plate 18
As a result, the hydraulic switching arm 21 is switched, whereby the lowering of the working unit 3 is stopped, and the working position is set to the working posture. In this state, the planting work is performed. When the traveling body 1 moves up and down with respect to the rice field due to unevenness of the cultivator, the sensing float 4 swings up and down relative to the working unit 3. Accordingly, the float connecting rod 11 is linked to the forward and backward movement, the swinging plate 15 and the operating plate 18 move forward and backward as described above, and the hydraulic switching arm 21 automatically switches and swings. Thus, the posture of the working unit is controlled so that the posture of the working unit 3 with respect to the rice field surface is substantially constant.

In addition, when the throttle lever 16 is operated during such a work traveling, if this is an operation for increasing the engine speed, the throttle wire 17 is pulled, thereby causing the swing plate 15 is pin 15
c moves forward from an immobile position with respect to the set slot 18b, and is maintained at this position, thereby shortening the distance between the hydraulic switching arm 21 and the pin 15c. Then, the switching sensitivity of the hydraulic pressure switching arm 21 accompanying the vertical movement of the sensing float 4 is adjusted to the insensitive side.

In the embodiment of the present invention configured as described above, the hydraulic switching arm 21 is automatically switched based on the relative vertical movement of the sensing float 4 with respect to the working unit 3 to move the working unit 3 up and down as described above. Control is performed and the work unit 3
Is automatically controlled to maintain a substantially constant work posture with respect to the rice field, but the sensitivity of this posture control is
Automatically adjusted based on throttle adjustment.

That is, the swinging plate 15 linked to the sensing float 4 side and the operating plate 18 linked to the hydraulic pressure switching arm 21 side are connected by the pin 15c of the swinging plate 15 side to the long hole 18b of the working plate 18 side. Although it is loosely fitted so as to be freely movable, it is set in an immovable state at an appropriate position in the middle of the elongated hole 18b by the tension balance between the slot wire 17 and the retaining elastic machine 19, and the plates 15 and 18 are integrated with each other. Hydraulic switching arm based on sensing the surface of float 4
The automatic switching operation of 21 will be performed, but when the throttle lever 16 is operated to adjust the engine speed,
The slot wire 17 is pushed and pulled against the maintenance bullet 19 to move the fixed position with respect to the long hole 18b of the pin 15c, and the set is maintained at a new fixed position corresponding to the throttle adjustment position. , Whereby a substantial rod length (pin) for switching the hydraulic switching arm 21 is operated.
The distance from 15c to the connection of the connecting rod 20 to the switching arm 21) is switched in a long and short manner in conjunction with the throttle adjustment, so that an automatic sensitivity adjustment is performed.

As described above, in the embodiment in which the present invention is implemented, the automatic sensitivity adjustment is performed based on the throttle adjustment. The sensitivity adjustment is performed by a substantial rod for switching the hydraulic switching arm 21. Since the length is directly changed in length and maintained in the changed state, the distance is too long as in the case where the sensitivity is adjusted on the working unit 3 side as in the conventional art, and the distance is too long due to the operating resistance. Not to mention that there is no large force loss, and there is no problem that the hydraulic sensitivity changes due to the change of the link angle as in the case of adjusting the sensitivity with the lifting link mechanism, and it is linked to the throttle adjustment. The adjusted sensitivity can be made simple and highly accurate.

In the above-described embodiment, the hydraulic discharge amount adjustment is performed by changing the engine speed based on the throttle adjustment. However, the present invention is not limited to this. The sensitivity adjustment in cooperation with the hydraulic discharge amount adjustment can be performed by using an appropriate means, and the hydraulic discharge amount is changed from a low discharge amount to a high discharge amount, that is, in the case of the above-described embodiment, The engine speed need not be adjusted in the entire throttle adjustment range from low speed to high speed, but can be adjusted in the selected adjustment range from medium speed to high speed, for example. In the case of low to medium speed, pin 15
In this case, the pin c may be brought into contact with the rear end of the long hole 18b, and the pin 15c may be set between the rear end and the front end of the long hole 18b in a range from middle speed to high speed.

In addition, the maintenance mechanism may be implemented by using an appropriate member device such as an electromagnetic valve instead of the maintenance elastic.

[Operation and Effect] In short, since the present invention is configured as described above, the sensitivity is automatically adjusted based on the hydraulic discharge amount adjustment operation. Is adjusted in the direction in which the hydraulic pressure sensitivity increases, the maintaining position of the oscillator with respect to the coupling body is flexibly moved to the side where the hydraulic sensitivity becomes lower.
As a result, the connection length between the hydraulic pressure changeover tool and the oscillating body is maintained at the length corresponding to the hydraulic discharge amount adjustment operation, and based on the sensitivity maintained at the set time, the hydraulic operation is performed by the surface sensing operation of the sensing float. A mechanism switching operation is performed.

Moreover, the automatic adjustment of the hydraulic sensitivity accompanying the adjustment of the hydraulic discharge amount is performed by tensioning the rocking body flexibly moved with respect to the connecting body in the direction opposite to the pulling operation direction of the rocking body. As a result of maintaining the interchange position,
Unlike the conventional one where the sensitivity adjustment is performed on the paddy working part side, the distance is too long and there is no large force loss due to the operating resistance in the middle, but the sensitivity adjustment is performed by the lifting link mechanism part. As described above, there is no problem that the hydraulic sensitivity changes due to the change of the link angle, and the sensitivity adjustment linked to the hydraulic discharge amount adjustment can be simplified and the precision can be increased.

[Brief description of the drawings]

The drawings show an embodiment of a hydraulic sensitivity adjusting device in a paddy working machine according to the present invention. FIG. 1 is an overall side view of a riding type rice transplanter, and FIG. 2 is a side view of a hydraulic sensitivity adjusting mechanism. FIG. 3 is a plan view of the same, and FIG. 4 is a front view of a main part of the same. In the figure, 1 is a traveling body, 3 is a planting work section, 4 is a sensing float, 12 is a sensitivity adjustment lever, 15 is a swinging plate, 17 is a throttle wire, 18 is an operating plate, 20 is a connecting rod, and 21 is a hydraulic switching arm. It is.

Continuation of the front page (72) Inventor Akira Inomata 667-1, Iya-cho, Higashi-Izumo-cho, Yatsuka-gun, Shimane Prefecture Inside Mitsubishi Agricultural Machinery Co., Ltd. (56) References JP-A-62-195208 (JP, A) -13017 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A01C 11/02 A01B 63/10

Claims (1)

(57) [Claims] A coupling body (18, 20) operatively connected to a hydraulic switching device (22) for switching a hydraulic operating mechanism, and an oscillating body (15) which oscillates in conjunction with a rice field sensing operation of a sensing float. In a paddy working machine that controls the hydraulic pressure of the paddy working unit so as to maintain the rice field posture of the paddy working unit substantially constant by switching the hydraulic operating mechanism based on the paddle surface sensing operation of the sensing float, The hydraulic interlocking body (17) extended from the hydraulic adjustment mechanism for adjusting the amount is connected to the above-mentioned connecting bodies (18, 20).
In connection with the swinging body (15) while being supported by the swinging body (15), the swinging body (15) and the connecting body (18, 20) are configured to adjust the hydraulic sensitivity in response to the hydraulic discharge amount adjustment operation. And a maintenance mechanism for maintaining the oscillating body (15) at a position corresponding to the discharge amount adjustment by tensioning the oscillating body (15) in a direction opposite to the pulling operation direction of the oscillating body (15) by the hydraulic discharge amount adjustment operation. On the other hand, the connecting body (18, 20) is provided with a flexible mechanism for accommodating the movement of the rocking body (15) corresponding to the discharge amount adjustment, and the connecting body (18) of the rocking body (15) is provided. A hydraulic sensitivity adjustment device for a paddy working machine, characterized in that the maintenance position for (18, 20) is moved to the side where the hydraulic sensitivity decreases when the hydraulic discharge amount increases.