JPS5816845B2 - Lifting device for walking rice transplanter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a float is attached to the underside of the machine so that it can move up and down, and a running wheel is attached to the body via a swing arm so that it can move up and down, and the float is operated in a planted state. This invention relates to a device for lifting and lowering the body of a walk-behind rice transplanter, which controls the body of the rice transplanter to be lowered and raised to a substantially constant level relative to the rice field by moving the running wheels up and down using a hydraulic system in response to ground pressure fluctuations.

In such an aircraft elevating device, an elevating detecting means whose lower end is connected to a float is connected to a switching valve provided between a hydraulic pump of the hydraulic device and a hydraulic cylinder mechanism that operates a swing arm. By linking the operating device and switching the switching valve by hand operation of the operating device, the aircraft can be forcibly raised, or the switching valve can be placed in a neutral state to fix the aircraft in the ascending state.

However, in the conventional model, the operation path of the hand-operated device was such that the switching valve was brought from the automatic position in the planted state, through the neutral position (fixed position), and then to the raised position where the aircraft was forcibly raised. When turning the wheels on a headland, when temporarily switching the vertical movement of the wheels to a fixed state, the operating device must be placed in the up position of the switching valve, and after the aircraft has surfaced, it must be returned to the neutral position and the turning can be started. is extremely complicated,
In addition, since the operation goes through the steps of automatic position → neutral → rise → neutral, turning operations take time and work efficiency is poor, and if the operations are simplified and the aircraft turns without levitating, the ground pressure of the float will be high. Therefore, there was a problem in that mud was pushed more often by the float.

The present invention has been made to solve such problems, and in the above-mentioned body lifting device of a walking rice transplanter, the operation path of the hand control device is changed from the automatic position where the switching valve is in the planting state. By configuring the rice transplanter to go through a raised position where the machine is forcibly raised, and then reach the neutral position, when the rice transplanter turns the headland and operates the hand control device, it will pass through the raised position.
While passing through this raised position, the aircraft is raised slightly, allowing the aircraft to rise slightly. This reduces mud pushing by the floats and makes turning operations easier without stopping the aircraft. This is done in an efficient manner.

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

In FIG. 1, reference numeral 1 is the body of a walking rice transplanter, a float 2 is installed below the body 1, and the float 2 is
The rear part is rotatably pivoted to the body 1 side, and the front part is connected to the body 1 via a link 3 so as to be movable up and down.

The fuselage 1 has a pair of left and right running wheels 5 approximately at the center in the longitudinal direction.
The wheel 5 is pivotally supported by the free end of a swing arm 4 whose base is pivotally supported on the body 1, and is movable up and down. It is designed to be driven together with the planting body 6 by an engine 7 mounted on the front part of the aircraft body 1.

The aircraft body 1 is provided with a hydraulic system 8, which, as shown in FIGS. It is equipped with a type switching valve 11 and a tank (not shown).

The switching valve 11 has an arm 1 provided on the valve body 13.
The upper end of a lift detecting means 12 whose lower end is connected to the front part of the float 2 is connected to 3a.

Further, at the rear of the machine body 1, a handle 15 is provided behind the seedling tank 14 and extends diagonally rearward and upward.
A mounting plate 16 is fixed to the mounting plate 16, and a hand control lever 17 is pivotally mounted to the mounting plate 16.

The operating lever 17 is connected to another arm 20 provided on the valve body 13 of the switching valve 11 via a guide means 18 and an operating cable 19, which will be described later.

The guide means 18 includes a cam plate 21 fixed to the operating lever 17 and a cam lever 22 pressed against the cam plate 21.
and a spring 23 that presses the cam lever 22 against the cam plate 21.
The operating cable 19 is connected to the cam lever 22.

The cam surface of the cam plate 21 has three cam surfaces A, B, and C that operate to switch the switching valve 11, and one of the cam surfaces has a rising portion B in the middle where the operating state for forcibly lifting the fuselage 1 is in the middle. An automatic position A where the switching valve 11 is in a planted state on one side and a neutral position C1 where the switching valve 11 is in a neutral state on the other side are arranged and formed in a continuous manner.

In the switching valve 11, a valve body 13 having a through hole 24 is rotatably fitted into a valve housing 25, and the valve housing 25 has a pump side port a, a tank side port B, and a piston advancing side, that is, a body rising side. A port c and a port d on the piston retraction side, that is, on the body lowering side, are provided at an angle of 90 degrees.

In FIG. 1, reference numeral 26 is a piston, and 27 is a connecting means.

The body elevating device configured as described above is in a planted state when the cam lever 22 is in pressure contact with the automatic position A of the cam plate 21 of the hand control lever 17.

In this state, since the operating cable 19 is loosened, the switching of the valve body 13 of the switching valve 11 is controlled by the detection means 12 connected to the float 2 according to the ground pressure of the float 2 sliding on the rice field. Ru.

Then, pressure oil from the hydraulic pump 9 is supplied to one end side or the other end side of the cylinder of the hydraulic cylinder mechanism 10 to advance and retract the piston 26 of the hydraulic cylinder mechanism 10, and the piston 26 is connected to the piston 26 via the connecting means 27. The connected swing arm 4 is vertically swung.

As a result, the running wheels 5 running on the tiller move up and down due to the unevenness of the tiller, and when the ground pressure acting on the float 2 is large, the running wheels 5 are moved downward, and when the ground pressure is small, the running wheels 5 are moved downward. By moving up and down in the ascending direction, the machine body 1 is raised and lowered relative to the circular surface, so that the machine body 1 slides on the rice field at a constant level, and the planting body 6 plants the seedlings at a predetermined depth. Control.

When turning the rice transplanter on a headland, the operation of the planting body 6 is stopped and the vertical movement of the wheels is temporarily switched to a fixed state using the hand control lever 17.
7, when the cam plate 21 is rotated from the automatic position A to the fixed neutral position C, the cam plate 21 is rotated in this process.
1 is temporarily pressed against the cam lever 22.

As a result, the cam lever 22 rotates and the operation cable 19
is pulled, and the valve body 13 of the switching valve 11 is rotated as shown by the chain line in FIG. 3, and the pump side port a and the body lifting side port c are temporarily communicated through the through hole 24.

Therefore, pressure oil is supplied to the wheel lowering side of the hydraulic cylinder mechanism 10, and the body 1 is forcibly raised a little regardless of the ground pressure of the float 2.

Then, by rotating the operating lever 17, the cam plate 2
1 crosses the rising portion B and reaches the neutral position C, the cam lever 22 rotates slightly in the opposite direction, causing the switching valve 1 to
A neutral state is established in which the first valve body 13 communicates the pump side port a and the tank side port b shown by the solid line in FIG. 3, and communicates the body ascending side port c and the machine descending side port d.

Therefore, the hydraulic cylinder mechanism 10 is in a fixed state,
Since the aircraft 1 is maintained in a slightly elevated state and turns are performed with the ground pressure of the float 2 being reduced, it is possible to turn with less mud pushing on the headland.

After the rotation is completed, the operation lever 17 is rotated in the opposite direction from when the rotation was started to return the cam lever 22 to the automatic position A of the cam plate 21, and the operation cable 19 is loosened as described above. The valve body 13 of the switching valve 11 is in a planted state, which is switched and controlled by the detection means 12 connected to the float 2.

During this return process, the rising portion B of the cam plate 12 is temporarily pressed against the cam lever 22, causing the aircraft to rise slightly, but when it shifts to the automatic position, the aircraft 1 instantly descends due to its own weight. It is possible to immediately return to the normal planting state without any problems.

In the above embodiment, the switching operation of the switching valve 11 is performed by so-called mechanical means such as the operating lever 17 and the guide means 18, but this may be performed by electrical means.

As explained above, according to the body lifting device for a walking rice transplanter according to the present invention, when turning a headland, etc., the operating device is moved from the automatic position to temporarily switch the vertical movement of the wheels to the fixed state using the hand operating device. When moving to the neutral position, the aircraft automatically rises a little as it passes through a rising section during the transition process and becomes stationary, which reduces the ground pressure of the float and prevents the float from muddying up when turning. The pressure can be reduced.

Furthermore, the operation is simple, as the aircraft is raised and fixed at the same time by moving the hand control device linearly in one direction. Compared to the two-step operation of raising and fixing, the operation can be greatly simplified, and in addition, since the aircraft is raised while passing the raising part of the control device, the operation is much easier. By controlling the soft speed of the device, the lifting height of the aircraft can be appropriately selected, and the aircraft does not rise completely to a high position unnecessarily, so the transition to planting work after turning is smooth and work efficiency is improved. Other effects such as being able to measure the direction of the object can also be obtained.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view showing a walking rice transplanter equipped with a body lifting device according to an embodiment of the present invention, Fig. 2 is a side view with a part of the hydraulic system cut away, and Fig. 3 is a diagram of the switching valve section. It is a cross-sectional explanatory view. 1... Aircraft, 2... Float, 3...
...Link, 4...Swing arm, 5.
... Traveling wheels, 6 ... Planting body, 7 ...
...Engine, 8...Hydraulic system, 9...
...Hydraulic pump, 10...Hydraulic cylinder mechanism,
11...Switching valve, 12...Detection means, 1
3... Valve body, 14... Seedling tank, 15
...Bundle, 16...Mounting plate, 17
......Hand control lever, 18...Guide means, 19...Manipulation cable, 20...
・Arm, 21...Cam plate, 22...
Cam lever, 23... Spring, 24...
Through hole, 25...Valve housing, 26...Piston, 27...Connection means, A...Automatic position, B...Rise Part, C: Neutral position, a: Pump side port, b: Tank side port, C: Aircraft ascending side port, d.
...Aircraft lowering side port.

Claims (1)

[Claims] 1. A float supported on the underside of the aircraft so that it can move up and down,
It has a running wheel attached to the aircraft body so as to be movable up and down via a swing arm, a hydraulic cylinder mechanism for moving the running wheel up and down, and a switching valve thereof, and a lower end of the switching valve is connected to the float. In addition to connecting the elevation detection means,
Furthermore, a hand-operated device is connected, and this hand-operated device has a rising part in the middle of the operation path that shifts the switching valve to the aircraft raised position, and an automatic position on both sides of the rising part that shifts the switching valve to the planted state. A body lifting device for a walk-behind rice transplanter, characterized in that it is provided with a neutral position for shifting a switching valve to a neutral state.