JPH0212812Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to an elevating device for elevating and lowering the rice transplanting device portion of a riding rice transplanter.

Prior Art Conventionally, as disclosed in Japanese Patent Application Laid-open No. 53-75015, there is a structure in which the rice transplanting device side is raised and lowered in a two-stage motion, and as seen in Japanese Patent Application Laid-Open No. 53-38513. There was one in which the rice transplanter side was raised and lowered by the expansion and contraction of the upper link.

Problems to be solved by the invention The technology disclosed in Japanese Patent Application Laid-Open No. 53-75015, which is a conventional device, has a structure in which the soil leveling float is brought into contact with the topsoil surface of the paddy field without changing the mounting orientation of the rice transplanting device with respect to the traveling vehicle body. Because the facing angle (elevation angle) does not change, the float moves upward with a constant ground pressure even in deep paddy fields, and the rice transplanter is controlled with a constant control sensitivity regardless of whether the paddy field is shallow or deep.

In addition, the device disclosed in Japanese Patent Application Laid-Open No. 53-38513 is a device that expands and contracts the upper link, and controls the facing angle of the rice transplanter side to be constant. , which was intended to be constant regardless of the shallowness of the field.

However, in such conventional control, the facing angle of the float is not corrected depending on the depth of the field, so in deep fields, the rice transplanter side is tilted forward and the float is lowered by the ground pressure of the float. There is no function that automatically makes the raising control of the rice transplanting device more sensitive when the rice transplanter moves up, and in deep fields, the surface of the paddy field is soft, so mud pushing by the ground float occurs, making reliable raising and lowering operation impossible. Ta.

Means for Solving the Problems In order to solve the above problems, the present invention has the following features:
The base sides of the upper link 5 and lower link 6 are pivotally attached to the traveling vehicle body 1, and the rear sides are connected by a vertical link 7, and the rice transplanting device 10 is attached to the vertical link 7 so as to be movable up and down. A hydraulic device 16 that rotates up and down from the link side is provided, and a switching operation part of a switching valve 18 of this hydraulic device 16 is connected to the float 14a of the rice transplanting device 10 to form a lifting device for a riding rice transplanter.

Effects and Effects of the Invention According to the present invention, the switching valve is switched by fluctuations in the ground pressure of the soil leveling float, and the rice transplanting device is moved up and down by the hydraulic device. At this time, in a deep field, when the rice transplanter moves up, it is in a forward-down position, so the front side of the soil leveling float approaches the topsoil of the paddy field and receives strong ground pressure, making it move up more sensitively. Because of this condition, the rise control of the rice transplanting equipment becomes sensitive.

Therefore, even in deep paddy fields, reliable lifting and lowering control is performed without mud pushing by the float.

Embodiment 1 is a running vehicle body having a pair of left and right wheels 2, 2 and rear wheels 3, 3. This running vehicle body 1 is equipped with an engine 4 at the front, and base sides of an upper link 5 and a lower link 6 at the rear. The rear end sides of both links are connected by a vertical link 7, and a connecting frame 9 extending rearward is rotatably attached to this connecting pin 8. It is installed so that it can be rotated up and down.

The rice transplanting device 10 includes a body 11 that also serves as a planting transmission case, and a seedling platform 12 that reciprocates from side to side, a seedling planting body 13, and a soil leveling float 14. 14a, consisting of side floats 14b, 14b located on the left and right sides of this center float,
Each of these floats is attached to the fuselage 11 so that the front part moves up and down centering on the rear part.

15 is a hydraulic cylinder device, which is interposed between the traveling vehicle body 1 and the upper link 5, and the link side is connected to the vehicle body 1.
It is operated to move up and down. 15a is a cylinder, and 15b is a piston.

Reference numeral 16 denotes a hydraulic device, in which a hydraulic cylinder device 17 and a hydraulic switching valve 18 are integrally constructed, and this hydraulic device 16 is interposed between the rear end side of the upper link 5 and the connecting frame 9. An operating rod 19 for switching the valve 18 projects downward and is configured to be pressed against the center float 14a. When the operating rod 19 is pushed up beyond a certain level by the float 14a, the valve 18 is switched, the piston 17a of the cylinder device 17 is retracted, the entire structure is reduced, the connecting frame 9 is rotated upward, and the rice transplanting device 10 is When the float 14a is lowered, the valve 18 is switched in the opposite direction, the piston 17a protrudes, and the connecting frame 9 is rotated downward, thereby lowering the rice transplanting device 10.
It is configured to unload.

Note that 20 is a hydraulic pipe connected to the pump side (not shown).

In the above example, when the paddy field being worked on becomes deeper, each of the floats 14a, 14 sliding on the topsoil surface
b, 14b are pushed up, and this center float 14a connects the switching valve 1 via the operating rod 19.
8 is switched, the piston 17a of the hydraulic cylinder device 17 is retracted, and the connecting frame 9 is rotated upward. Therefore, the rice transplanting device 10 is lifted while being tilted forward, and the facing angle of the floats changes. On the other hand, when the depth becomes shallower, the piston 17a protrudes and moves downward so that the rice transplanting device 10 falls backward.

In this way, when the paddy field becomes deep, the rice transplanting device 10 automatically changes its posture to move forward and downward so that the float can be pushed up even with weak ground pressure, and conversely, when the paddy field becomes shallow, the rice transplanting device 10 automatically changes its posture. The float will not be able to be pushed up unless it receives strong ground pressure by changing its position backwards.
This eliminates the mud pushing caused by floats in deep fields, and allows accurate lifting and lowering control of the rice transplanter.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, in which FIG. 1 is a side view, FIG. 2 is a plan view of the main part, and FIG. 3 is a partially sectional side view of the main part. Symbols in the diagram: 1 is the elevating vehicle body, 5 is the upper link,
6 is the lower link, 7 is the vertical link, 9 is the connecting frame, 1
0 is a rice transplanting device, 14 is a float, 16 is an oil operated device, and 18 is a valve.

Claims (1)

[Scope of utility model registration request] The base sides of the upper link 5 and lower link 6 are pivotally attached to the traveling vehicle body 1, and the rear sides are connected by a vertical link 7, and the rice transplanting device 10 is attached to the vertical link 7 so as to be movable up and down. This lifting device for a riding rice transplanter is provided with a hydraulic device 16 that rotates up and down from the link side, and a switching operation part of a switching valve 18 of this hydraulic device 16 is linked to a float 14a of the rice transplanting device 10.