JPH0123087B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a planting depth adjustment device in a rice transplanter, in which a pivot point near the planting portion of a sensing float is linked to the body side and link of a switching valve in an automatic height control device at the front end. This invention relates to a lock release device that releases the lock when the lower rear surface of the float comes into contact with a ridge or the like and the sensing float and planting depth adjustment device become locked, rendering the switching valve inoperable.

[Conventional technology]

The rear part of the sensing float is pivoted so that it can move up and down,
A switching valve of an automatic height control device that controls the ground pressure of the float to always be constant is installed at the front end of the sensing float together with a link, and these pivot points and the body side of the switching valve are connected by a planting depth adjustment device. The applicant has proposed a rice transplanter that is configured to move up and down together in accordance with the planting depth. In such rice transplanters, the planting depth can be adjusted by moving the pivot point near the planting part of the float up and down, but the sensing float is equipped with a switching valve and a link at the front end. Therefore, if the sensing float moves up and down when adjusting the planting depth, the switching valve will be operated. Therefore, in order to eliminate this problem, when the pivot point of the sensing float is moved up and down to adjust the planting depth, the body side and link of the switching valve at the front end of the float are also moved up and down together. A planting depth adjustment device having an interlocking configuration has been proposed.

[Problems to be solved by the invention]

By the way, in the conventional planting depth adjustment device, the switching valve and the link are connected so that they always operate integrally in response to the adjustment operation. In such a case, the front end of the sensing float is strongly pressed against the topsoil side, restraining the spool side of the switching valve, and the planting depth adjustment device is locked, restraining the body side of the switching valve. The switching valve becomes inoperable. Therefore, it is no longer possible to avoid such troubles by manually operating the switching valve using a hydraulic lever, etc. to raise the entire planting area, and it is impossible to avoid such troubles by forcing the plant to move in this state and raise the sensing float. There was no other way but to remove it from the list.

[Means to solve the problem]

The present invention has been made to solve such problems, and includes connecting the body side of the switching valve to the planting depth adjusting device so as to be able to move integrally or separately with a link for switching operation. By providing a lock release mechanism that releases the lock via the link when the lower rear surface of the sensing float contacts a ridge or the like and the sensing float, planting depth adjustment device, and switching valve are locked together with the link. Therefore, in the event of a problem such as the rear lower surface of the sensing float coming into contact with a ridge, etc., it is possible to solve the problem by manually operating the switching valve via the link and raising the entire planting area. The present invention provides a lock release device for a planting depth adjustment device in a rice transplanter.

【Example】

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. An example of a riding type rice transplanter is shown in Fig. 1, where reference numeral 1 is a passenger car body, with front and rear wheels 3 and 4 under the body frame 2, and a driver's seat 5 above them. The vehicle is driven by a worker sitting in the driver's seat 5 and operating the vehicle.
A planting machine 7 is connected to the rear part of the plant via a lift mechanism 6. In the planting work machine 7, a float 9 is pivoted under the body frame 8 so as to be movable up and down on a support plate 10 near the rear planting part, and is extendable and retractable on a dogleg-shaped link 11 in the front. supported,
A seedling tank 12 is installed so as to slide and level the rice field, and a seedling tank 12 on which seedlings are placed on the machine frame 8 is supported and placed so as to move back and forth in the left and right direction. The implants 13 are arranged facing each other, and the vertical movement of the implants 13 moves the seedling tank 1.
Starting from 2, seedlings are cut out one by one and planted in the field. The lift mechanism 6 includes a link support 14 erected at the rear of the passenger vehicle body 1 and a planting work machine 7.
A link mechanism 16 is constructed between the rolling box 15 at the front end of the hydraulic cylinder 18, and a hydraulic cylinder 18 is provided between the link mechanism 16, an integral lift arm 17, and the link support 14. The planting machine 7 moves up and down via the lift arm 17 and the link mechanism 16. In addition, a third switching valve 19 is provided at the front end of the sensing float 9a in the center of the planting machine 7.
As detailed in the figure, the body 19a is attached to the fuselage frame side via a shaft 39 which will be described later, the spool 19b is attached to the sensing float 9a via the bracket 20, and a valve is attached according to the float height position. Equipped to work. and,
As shown in FIG. 2, this switching valve 19 is hydraulically connected to the hydraulic cylinder 18 and a pump 22 that pumps up oil from an oil tank 21 to form an automatic height control device 23. By operating the switching valve 19 as the sensing float 9a moves up and down,
The hydraulic cylinder 18 is expanded and contracted by supplying and discharging oil, and the planting machine 7 is moved to float ground pressure via the lift mechanism 6.
That is, it is designed to automatically move up and down so that the planting depth is always constant. On the other hand, the end of the member 11a from the float side of the link 11 disposed adjacent to the switching valve 19 is connected to the hydraulic lever 26 in the driver's seat 5 of the passenger vehicle body 1 via the spring 25 of the wire 24. In addition, when traveling on the road, turning, etc., the planting machine 7 can be raised or lowered as desired by manually operating the hydraulic lever 26 and operating the switching valve 19 via the link 11. Next, referring to FIGS. 3 and 4, the planting depth adjusting device 27, which is the main focus of the present invention, will be explained. A support plate 10 such as the above-mentioned sensing float 9a is pivotally supported by a pin 10a, and a planting depth adjustment lever 30 is attached. switching valve 1
It will be extended to the 9th side. The rod 32 is connected to a lever 34 of a shaft 33 that is pivotally supported on the fuselage frame 8 side near the switching valve 19, and an arm 35 from the shaft 33 is attached to the side of the switching valve 19 and is substantially perpendicular thereto. When the planting depth adjustment lever 30 is operated up and down to move the rear part of the sensing float 9a etc. up and down, the action of the shaft 28, lever 31, rod 32, lever 34, and shaft 33 The arm 35 can be rotated up and down in the same manner. Therefore, the arm 35 of the planting depth adjusting device 27 is connected to the switching valve 1 via the lock release device 36.
This lock release device 36 has an L-shaped connecting lever 37 whose middle part is pivoted to the arm 35 by a shaft 38, and one end of which is pivoted to the switching valve body 19a by a shaft 39. At the same time, the other end is connected to the side of the arm 35 opposite to the switching valve 19 via a spring 40. The connecting lever 37 also includes an arm 35.
A stopper 41 is formed to protrude and come into contact with the
When the arm 35 rotates up and down, the switching valve 1
The bodies 19a of 9 can be moved up and down integrally, and the bodies 19a can be moved upwards separately with respect to the arm 35. Since the present invention is configured in this manner, normally the body 19a of the switching valve 19 is integrally connected (fixed) to the arm 35 by the stopper 41 via the connecting lever 37, and the body 19a on the fixed side is The spool 19b is attached to the sensing float 9 on the 19a.
A or by operating the hydraulic lever 26, the link 11 moves up and down, and the valve moves in and out, thereby automatically controlling the height or raising and lowering the planting machine 7. Then, when the planting depth adjustment lever 30 is lifted to raise the rear part of the sensing float 9a etc. in order to deepen the planting depth, the arm 35 is rotated upward by the operation of the planting depth adjustment device 27 and connected. Along with the lever 37, the body 19a side of the switching valve 19 also rises a little, and the switching valve spool 19 rises together with the float 9a.
Malfunction of the switching valve 19 due to an increase in b is prevented, and at the same time the sensing conditions are kept the same. By the way, when the planting machine 7 is lowered after turning at the edge of a ridge, if the rear lower surface of the sensing float 9a etc. comes into contact with the ridge as shown in FIG. 3, the front end of the sensing float 9a etc. It is strongly pressed against the topsoil side and locked, and the planting depth adjustment lever 30 is fixed together with the arm 29 by being pushed up by the ridge, and the entire planting depth adjustment device 27 is locked in a rigid state.
However, the body 19a of the switching valve 19 can be moved upward separately by the connecting lever 37, and by manually operating the hydraulic lever 26 to extend the link 11, the stopper 41 can be disengaged against the spring 40. Meanwhile, the connecting lever 37 rotates clockwise around the shaft 38, the pin 39 moves downward, and the body 19a moves downward, which is essentially the same state as when the sensing float 9a moves upward. becomes. Therefore, the switching valve 19 operates to raise the entire planting machine 7, thus solving the problem of the lower surface of the float coming into contact with the ridge, etc.
The lowering setting of the planting machine 7 can be performed again.

【Effect of the invention】

Thus, according to the invention, the sensing float 9a
A planting depth adjustment device 2 in which a switching valve 19 for detecting float height in a rear pivot point and a front automatic height control device 23 are interlocked together with a link 11.
In the rice transplanter having 7, the planting depth adjustment device 2
7 to link the body 19a of the switching valve 19 to the link 11
connected so that they can move together or separately,
When the lower rear surface of the sensing float 9a comes into contact with a ridge or the like and the switching valve 19 is locked together with the sensing float 9a and the planting depth adjustment device 27, a release mechanism 36 is provided which releases the lock via the link 11. The trouble of the sensing float 9a whose lower surface is in contact with a ridge or the like can be easily and easily resolved. Moreover, as a means for releasing this, as shown in the embodiment, the hydraulic lever 26 that raises and lowers the planting work machine 7 can be used, so that the operation can be performed safely without making any mistakes.

[Brief explanation of drawings]

Fig. 1 is a side view showing a riding type rice transplanter as an example to which the present invention is applied, Fig. 2 is a hydraulic circuit diagram of an automatic height control device, and Fig. 3 is a planting machine using an embodiment of the device according to the present invention. Side view with depth adjustment device, No. 4
The figure is a front view of the main parts. DESCRIPTION OF SYMBOLS 1... Passenger vehicle body, 6... Lift mechanism, 7... Planting work machine, 9... Float, 9a... Sensing float, 11... Link, 19... Switching valve, 19
a...Body, 19b...Spool, 23...Automatic height control device, 26...Hydraulic lever, 27...
Planting depth adjustment device, 36... lock release device.

Claims (1)

[Scope of Claims] 1. The rear part of the sensing float is pivoted so that it can move up and down, and a switching valve of an automatic height control device is linked to the front end of the sensing float so that the ground pressure of the float is always constant. and the pivot point and the body side of the switching valve are linked so that they can move up and down together according to the planting depth by means of a planting depth adjustment device, in which the above-mentioned The body side of the switching valve is connected so as to be able to move integrally or separately with the link to perform a switching operation, and when the rear lower surface of the sensing float comes into contact with a ridge or the like, the sensing float
A lock release device for a planting depth adjustment device in a rice transplanter, characterized by being provided with a lock release mechanism for releasing the lock via the link when the switching valve is locked together with the planting depth adjustment device. .