JPH0258889B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides the results of detecting the height of the grounding float relative to the aircraft body, which is attached in a downwardly biased state so that the seedling planting depth is maintained almost constant regardless of the unevenness of the tiller. The present invention relates to a rice transplanter equipped with a control mechanism that automatically controls the detected height to be within a set range based on the above, and more specifically, relates to a rice transplanter equipped with a damper linked to the raising and lowering of the grounding float relative to the body.

This seed rice transplanter is designed so that when the depth of the tiller changes smoothly, the ground float responds smoothly to the change in depth by moving up and down relative to the aircraft, ensuring accurate control. In addition, even if a ground reaction force acts on the ground float due to the impact, as in the case where there is a sudden depression or sudden drop in the plowing platform, the float will not rise too much relative to the aircraft due to inertia. This is prevented by the resistance provided by the damper, and the control is performed in a stable state without hunting. However, in the past, when the aircraft suddenly rose above the ground due to a sudden bulge in the plow or a step that suddenly became shallower, the ground float was unable to descend smoothly against the aircraft due to resistance from the damper. The aircraft was surfacing above the ground without any movement, causing a delay in control.

In view of the above-mentioned circumstances, an object of the present invention is to prevent the grounding float from climbing too high due to inertia, and also to allow the grounding float to descend quickly when the aircraft suddenly ascends.

A characteristic configuration of the present invention is that in the rice transplanter described at the beginning, the resistance of the damper to the rising of the ground float relative to the aircraft body is greater than the resistance of the damper to the lowering of the ground float relative to the aircraft body,
and the connecting point on the fuselage side of the damper moves up and down with respect to the grounding float only by moving up and down integrally with the fuselage side, and the connecting point on the float side of the damper moves up and down with respect to the grounding float only by moving up and down together with the float. The damper can be installed while the damper is being raised or lowered. The functions and effects thereof are as follows.

In other words, in the damper, the difference in resistance applied to the ground float acts to make it difficult for the ground float to rise relative to the aircraft, and to cause the ground float to quickly descend relative to the aircraft. . Furthermore, even when the float is lowering the aircraft,
Due to the above-mentioned connection configuration of the connection points on the fuselage side and the float side of the damper, it always acts to suppress excessive downward movement due to the inertia of the grounding float, regardless of whether the downward stroke of the float is large or small.

Therefore, even if the aircraft suddenly descends and a ground reaction force acts on the ground float, the ground float can be prevented from rising too much due to inertia, and control can be performed in a stable state without hunting. In addition, even if the aircraft suddenly rises, the ground float can quickly descend to the aircraft without lifting up with the aircraft, and the control based on the aircraft's sudden rise is responsive, and hunting is less likely to occur. You can make it happen. As a result, regardless of the degree of change in the depth of the tiller, and regardless of the hardness or softness of the muddy soil, it is possible to plant seedlings with a high degree of precision that prevents changes in planting depth or floating seedlings. Ta.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a pair of left and right wheels 1, 1,
An engine bonnet 2 that can be opened and closed by swinging up and down around an axis on the rear end side, a fertilizer tank 3 that swings integrally with the bonnet 2, a balance spring 4 for reducing the force required to open the engine bonnet 2, and A seedling planting section consisting of a seedling planting arm 6, a seedling stand 7, etc. is attached to the rear of the traveling body having a control handle 5, etc., and one front grounding float 8 is attached to the lower part of the traveling body. , a pair of left and right rear grounding floats 9, 9, and a fertilizer applicator 10 that is installed to create a groove near the seedling planting site and supply fertilizer from the tank 3 to the formed groove, making it possible to perform four-row planting and fertilizing operations. This is a walking-type rice transplanter.

As shown in FIG. 2, a pair of transmission cases 11, 11 each having left and right wheels 1, 1 attached to the free end sides are respectively attached to the traveling body so as to swing up and down around the axis _P1 . , transmission case 11, 11
A member 13 interlocked with each swing operation arm 11a via a rod 12 is attached to the traveling machine body via a hydraulic cylinder 14 so as to be able to move back and forth, and by operating the cylinder 14, the member 13 can be moved from side to side. The wheels 1 can be raised and lowered relative to the machine body, and the seedling planting depth can be adjusted. The rear end side of the front float 8 is pivotally connected to the traveling body via the rod 15, and the rod 1
A pair of left and right dampers 1 are installed on the front end side of the connection part 5.
6, 16 to the traveling machine body so that it can rise and fall freely, and the front float 8 is connected to the traveling machine body with an axis P ₂
It is configured to swing up and down around the body, and is biased downward by its own weight and a spring 17.
Then, the height of the front float 8 relative to the aircraft is detected by the telescopic rod 19 and the swinging member 20, in which the rear end of the front float 8 is interlocked and connected to the control valve 18 of the cylinder 14. Based on the detection results, the left and right wheels 1,
A control mechanism 21 is configured to automatically raise and lower the seedling seedling planting part 1, so that regardless of changes in the depth of the tiller, the height of the soil surface of the seedling planting part is maintained within the set range, and the planting depth can be controlled. It is configured so that work can be done while maintaining it at a nearly constant level.

As shown in FIG. 3, each of the dampers 16 is constructed by attaching a piston rod 23 to a cylinder tube 22 so that it can move forward and backward, and as the piston rod 23 slides, damper oil flows from either the bottom side chamber or the rod side chamber. flowing to the other side 2
The main flow passages 24 and 25 are formed into a telescoping oil damper formed by a piston 26, and a second
As shown in the figure, it is installed across the traveling aircraft body and the front float 8 so as to be shortened as the front float 8 rises relative to the aircraft body. Then, the flow path 2
The on-off valve 27 for one 24 of 4 and 25 is configured to be opened by the oil pressure passing through the flow path 24 when it is extended, and closed by the oil pressure in the bottom side chamber when it is shortened. Damper 1 applied to float 8 before the aircraft ascends
6 is configured so that the resistance of the damper 16 is greater than the resistance of the damper 16 applied to the float 8 before lowering the machine body, the depth change of the tiller is smooth, and the ground elevation speed of the machine body is below the set speed. Sometimes, the front float 8 is raised and lowered relative to the aircraft as the aircraft rises and lowers from the ground, and when the depth of the plow changes rapidly and the aircraft descends from the ground at a higher speed than the set speed. In order to prevent the front float 8 from rising too high due to inertia, a large resistance is provided to prevent the front float 8 from rising too high.Furthermore, the depth of the plowing plate is abruptly changed and the machine body rises above the ground at a higher speed than the set speed. Also, the front float 8 is configured to quickly descend toward the aircraft without receiving much resistance.

The cylinder tube 22 side of the damper 16 is pivotally connected to the traveling body part so that only relative rotation is possible, and the piston rod 23 side of the damper 16 is pivotally attached to the float part so that only relative rotation is possible, thereby connecting the damper 16 to the body side. The end of the cylinder tube as a part is connected to the traveling aircraft side so that it can be raised and lowered with respect to the ground float only by integral lifting and lowering with the traveling aircraft body, and the end of the piston rod as the connection part on the float side of the damper 16 is connected to the ground float. The ground float 8 is connected to the ground float 8 so that it can be raised and lowered relative to the traveling body only by being raised and lowered integrally with the ground float 8. In other words, with this connection configuration, even when descending relative to the ground float 8 or the traveling aircraft body, the damper 16 always acts to provide resistance regardless of the magnitude of the downward stroke.

[Brief explanation of the drawing]

The drawings show an embodiment of the rice transplanter according to the present invention, in which FIG. 1 is a walk-behind rice transplanter, FIG. 2 is a side view of a wheel elevation control mechanism, and FIG. 3 is a sectional view of a damper. 1...Wheel, 8...Grounding float, 16...Damper, 21...Control mechanism.

Claims (1)

[Claims] 1 Ground float 8 installed in downward biased state
A control mechanism 21 is provided which automatically controls the detected height to be within a set range based on the detection result of the height relative to the aircraft, and a damper 16 is provided which is linked to the raising and lowering of the ground float 8 relative to the aircraft. The rice transplanter is a rice transplanter in which the resistance of the damper 16 to the rising of the grounding float 8 relative to the aircraft body is greater than the resistance of the damper 16 to the descending of the grounding float 8 relative to the aircraft body, and A state in which the side connection point moves up and down with respect to the ground float 8 only by moving up and down integrally with the body side, and the float side connection point of the damper 16 moves up and down with respect to the body only by going up and down together with the float side. A rice transplanter in which the damper 16 is installed.