JPH0130442B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for raising and lowering a machine body using float sensing, and particularly to a device for adjusting the sensitivity for raising and lowering a rice transplanter during rotation.

As a well-known walk-behind rice transplanter, the rice transplanter has a planting section at the rear and a pair of running wheels on both left and right sides of the middle section.A float is installed on the underside of the main body of the rice transplanter, and a float is installed on the steering handle provided at the rear of the main body. Some plants are equipped with a clutch lever for intermittent operation of power to the planting section.
During planting work, on headlands, etc., the power to the planting section is cut off using the clutch lever to stop the drive, and the running wheels are lowered using hydraulic cylinders, etc. to separate the rice transplanter body and float from the rice field. For example, if the width of the body (float) is narrow, such as two planting rows, all you have to do is stop the operation of the planting part, leaving the float in contact with the rice field. A circular work method is used. In this case, the operator lifts the steering handle upward to rotate the float with a small radius of rotation, which causes the disadvantage that the front part of the float comes into strong contact with the field surface and roughens the surface.

Therefore, in the present invention, the float is attached to the rice transplanter main body so that the rear part can be rotated back and forth and the front part can be moved up and down, and the telescopic operation of the hydraulic cylinder that moves the traveling wheels up and down is switched to this front position. A switching mechanism is provided, and the switching mechanism and the clutch lever are connected to each other,
By interlocking and connecting the switching mechanism so that it is sensitive when the clutch lever is on the cutting side, it is possible to stop the drive of the planting part at headlands etc. and rotate the float while it is in contact with the rice field. When the tip of the float comes into contact with the rice field, the wheels immediately descend and the float rises above the rice field, reducing mud pushing and moving around the headland without disturbing the field, making planting work more efficient. The present invention provides an elevation sensitivity device for a rice transplanter that eliminates the above-mentioned disadvantages.

Embodiments of the present invention will be specifically described below with reference to the drawings. In the figure, reference numeral 1 denotes the main body of a walking rice transplanter, and this main body 1 is equipped with an engine 2 at the front, a planting section 3 at the rear, and running wheels 4, 4 on both left and right sides of the middle section. is mounted so as to be vertically movable via chain cases 5, 5. The planting section 3 includes a seedling tank 6 in which pine-shaped seedlings are placed and moves back and forth a predetermined distance from side to side, and a planting section in which seedlings are taken out one by one from the lower end of the slope of the seedling tank 6 and planted on the rice field. The seedling tank 6 is vertically partitioned into two parts, and correspondingly two planting bodies 7 are provided for two rows of planting. In addition, on the lower side of the main body 1,
A front float 8 and a rear float 9 are provided.

The front float 8 has its rear portion pivoted to the main body 1 via a bracket 10 so as to be rotatable back and forth, and its front portion mounted on the main body 1 via a link body 10a so as to be movable up and down. The rear float 9 also has its rear portion pivoted to the main body 1 via a bracket 11 so as to be rotatable back and forth, and its front portion mounted on the main body 1 via a link body 12 so as to be movable up and down.

A hydraulic valve 13 is attached to the tip of the front float 8 to switch the oil path by expanding and contracting in the vertical direction. This hydraulic valve 13 is connected to a hydraulic cylinder 14 attached to the main body 1 via a conduit 15, expands and contracts a piston 14a of the hydraulic cylinder 14, and connects this piston rod 14a and the chain case 5 via a rod 5a. The running wheels 4 are moved up and down. Further, the hydraulic valve 13 has its lower end pivoted to the tip of the front float 8 , and its upper end pivoted to the lower end of the bell crank 16 which is pivoted to the main body 1 by a pivot pin 17 . The upper end is connected to the main body 1 via a spring 18. By changing the mounting position of the upper end of the bell crank 16 back and forth, the spring 18 can change the spring pressure and adjust the switching sensitivity of the hydraulic valve 13.

On the other hand, the steering handle 2 attached to the rear of the main body 1
0 is provided with a clutch lever 19 for intermittent operation of power from the engine 2 to the planting section 3,
The clutch lever 19 is connected to the clutch via an operating wire 19a, and another operating wire 19b is connected at the upper end of the bell crank 16 in the opposite direction to the mounting position of the spring 18. When the clutch lever 19 is set to the cutting side and the operation of the planting section 3 is stopped, the operation wire 19b is loosened so that the switching sensitivity of the hydraulic valve 13 becomes sensitive.

Next, the effect will be explained. The rice transplanter introduced into the field during planting work is supported by a front float 8 at the front of the machine and a rear float 9 at the rear of the machine. Plant 2 rows of seedlings. When the planting section 3 is driven, the clutch lever 19 is connected to the power, and the operating wire 19b is tensioned.
The upper end of the bell crank 16 is pulled forward, and the hydraulic valve 13 normally senses the vertical movement of the front float 8, switches the oil path according to the vertical movement of the spool, and connects the piston of the hydraulic cylinder 14 via the conduit 15. 14a is expanded and contracted, and the rod 5a-chain case 5
The running wheels 4 are moved up and down via the
The planting depth of the seedlings planted with the planting body 7 is kept almost constant.

When the rice transplanter comes to the edge of the field and rotates, the power to the planting section 3 is cut off by the clutch lever 19. Then, the operating wire 19b is loosened, the upper end of the bell crank 16 is pulled by the spring 8, the hydraulic valve 13 is pulled slightly upward, the front float 8 starts to move up and down slightly, and the steering handle 20 moves upward and downward when turning. If you lift the front float 8 and turn it with a small turning radius so that the tip of the front float 8 is in contact with the rice field,
The hydraulic valve 13 is sensitively switched, the traveling wheels 4 are lowered, and the machine body is lifted, so that the front float 8 in particular does not get into the rice field, so mud is pushed less and it is possible to turn without disturbing the headland. Of course, when this rice transplanter is running on the road,
An operating mechanism (not shown) lowers the running wheels 4 so that the machine can run with only the running wheels 4 in contact with the ground, but if the width of the machine is small, such as when planting in two rows, the machine will run when turning at the edge of the field. If the wheel 4 were to be switched up and down, the operation would be cumbersome and the work efficiency would be reduced, so the turning operation can be performed efficiently by simply switching the clutch lever 19 as described above.

As is clear from the above explanation, according to the rice transplanter elevation sensitivity adjustment device of the present invention, when the clutch lever 19 of the planting section 3 is switched to the cutting side, the hydraulic valve 13 is switched via the operating wire 19b. The sensitivity is linked to make it sensitive, so when the front part of the float touches the field surface when turning the machine at the edge of the field, the running wheels are immediately lowered to avoid strong contact between the float and the field surface and reduce mud pushing. It is possible to turn without disturbing the headland, which is particularly convenient when turning with a float attached to it, such as a rice transplanter for 2-3 rows. In addition, when raising the float and turning, regardless of whether the float is walking or riding, if the front part of the float comes into contact with the rice field, the sensitivity of raising the float becomes sharp, which is convenient.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of the entire rice transplanter, and FIG. 2 is a plan view thereof. 1... Rice transplanter main body, 3... Planting section, 4... Running wheels, 5... Chain case, 8... Front float,
9... Rear float, 13... Hydraulic valve, 14...
... Hydraulic cylinder, 15 ... Conduit, 16 ... Bell crank, 18 ... Spring, 19 ... Clutch lever, 20 ... Steering handle.

Claims (1)

[Claims] 1. A float is installed on the underside of the main body of the rice transplanter, which has a planting section at the rear and a pair of running wheels on both left and right sides of the middle section, and a running handle provided at the rear of the main body is used to transmit power to the planting section. In a walk-behind rice transplanter equipped with a clutch lever for intermittent operation, the float has a rear part that can be rotated back and forth with respect to the rice transplanter body;
The front part is mounted so as to be movable up and down, and a switching mechanism is provided at this front position to switch the expansion/contraction operation of a hydraulic cylinder that moves the traveling wheels up and down.This switching mechanism and the clutch lever are connected when the clutch lever is on the cutting side. A lifting sensitivity adjustment device for a rice transplanter, characterized in that the switching mechanism is interlocked and connected so that the sensitivity becomes sensitive when the rice transplanter becomes wet.