JPS6134772B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a wheel vertical movement device for a walking rice transplanter.

One type of walk-behind rice transplanter is equipped with a float under the body of the rice transplanter, and the wheels are attached to the body so that they can move up and down via a swing arm that also serves as a transmission case. The rice planting system is constructed so that the machine is supported above the rice field by the buoyancy of the float, only the wheels are always in contact with the tiller to provide propulsion, and the planting depth of the seedlings is always constant. machine is known.

A walk-behind rice transplanter constructed in this way is equipped with a mechanism for moving the wheels up and down using a hydraulic drive source, since the wheels must always be in contact with the tiller and the machine must travel relative to the field surface. , a change in the float pressure from the rice field acting on the float causes a switching valve provided in the hydraulic conduit of the hydraulic drive source to move the wheel upward or downward;
The aircraft is configured so that it always travels based on the field.

However, if the running clutch is cut to stop the rice transplanter while the rice transplanter is running to load seedlings, etc., the center of gravity of the rice transplanter is originally located in front of the wheel grounding point, and the wheels are not driven properly. When the rice transplanter stops running, this resistance due to the driving force disappears and the rice transplanter is configured to maintain an approximately horizontal position due to the resistance to the movement of the rice transplanter. The rice transplanter was forced to tilt forward more and more as the rice transplanter rose and the wheels lowered.
This caused problems in loading pine seedlings, etc.

Therefore, the present invention is characterized in that it is constructed so that the wheels cannot be lowered in conjunction with the "disengaged" operation of the travel clutch.

An embodiment of the present invention will be described below with reference to the accompanying drawings. First, Figure 1 is a side view of a walking rice transplanter.
1 is mounted, a float 2 is attached under the fuselage, the rear end of the float 2 is pivoted to the fuselage 1 by a pivot shaft 21, and the front end is supported by a bending link 22.
It is supported by the fuselage 1 via a vertically movable means.
Further, one end of a swing arm 3 which also serves as a transmission case is pivotally supported on both sides of the body 1, and a wheel 31 supported by an axle is attached to the other end. By rotating this swing arm 3 around a pivot point, the wheels 31 are moved up and down.A hydraulic cylinder unit 4 is used as a driving source for the up and down movement mechanism, and the swing arm 3 is moved by the expansion and contraction of the piston rod 41. The hydraulic cylinder unit 4
An oil pump 42 is connected to via a switching valve 43.

The vertical relative displacement of the float 2 with respect to the fuselage 1 is controlled by the switching valve 43 via the actuating mechanism 50.
The operating mechanism 50 has a sensing rod 51 whose one end is pivotally supported by the float 2, and the upper end of the sensing rod 51 is connected to the
As shown in the enlarged view, it is pivotally connected to a float actuating arm 53 which is pivotally supported by a pivot pin 52 at a side position of the hydraulic cylinder unit 4. It consists of a valve operating arm 54 which is pivotally supported together with the float operating arm 53 by the pivot pin 52 at a side position of the cylinder unit 4, and a stopper 53a formed at the end of the float operating arm 53 is connected to the valve operating arm 54. It is locked on the side and restricts the upward movement of the wheel. Further, the actuation mechanism 50 has a switching rod 55 pivotally connected to the lower end of the valve operating arm 54, and the other end of the switching rod 55 is pivotally connected to the end of the operating lever 43a of the switching valve 43. It's summery. The sensing rod 51 is formed of two members, and a connecting body 51b is fixed to the lower end of the sensing rod main body 51a.The connecting body 51b is penetrated in the vertical direction, and the lower end is pivotally attached to the float 2. The structure is such that ground pressure is applied to the float rod 51c by a compression spring 51d. Further, an arcuate guide groove 53b is formed in the float actuation arm 53, and an arcuate guide groove 54a is formed in the valve actuation arm 54 at the end opposite to the side where the switching rod 55 is provided. cage, each guide groove 53
An end portion of an operating lever of an operating mechanism 60, which will be described later, is connected to b and 54a.

In the operating mechanism 60, an operating lever 61a that operates together with a traveling clutch operating lever 61 is interlocked with each other via a wire 61b, an end of the operating lever 61a engages with a guide groove 53b, and a guide groove 54a has a You can adjust the rice transplanter's planting posture by selecting the position of the wheels, or
Hydraulic operating rod 62 for determining lift state
The operating rod 62 is interlocked with the wire 62b.
The ends of b are engaged. Each operating rod 61a, 6
2a is pushed by push springs 63, 64, and the ends of the push springs 63, 64 are attached to a support frame 65 provided on the rice transplanter main body.
It is accepted by and valve actuation arm 54
The other end 66d of the valve return spring 66, one end of which is attached to the tension adjuster 66a, is selectively locked in one of a plurality of locking holes 66b provided in the tension adjuster 66a for adjusting the tension. The tool 66a is connected to a wire 66c and is configured to be interlocked with a planting clutch operating lever provided at the operator's hand via the wire 66c.

Next, the operation of the wheel vertical movement device of the walking rice transplanter according to the present invention will be explained. First, when the rice transplanter is in operation, the traveling clutch operating lever 61 and the hydraulic operating lever 62 are in the "on" and "planting" states, respectively, so the float operating arm 53 and the valve operating arm 54 are in the "on" and "planting" states, respectively. Considering the neutral position in FIG. 2, the ends of the operating rods 61a and 62a that engage with the respective grooves 53b and 54a are as follows.
Both occupy the vicinity of the center of the grooves 53b and 54a, respectively. Therefore, the operating rod 61a,
62a does not impede the rotation of the float operating arm 53 and valve operating arm 54 at all. Therefore, when the rice transplanter is moved to a deep position in the tiller, the float pressure from the rice field that acts on the float 2 increases, and the float 2 pushes up the sensing rod 51 and moves the float operating arm 53 around the axis 52. Rotate the valve operating arm 54 with the stopper 53a.
Lock and turn the switch, move the switching rod 55, set the port of the switching valve 43 to the port for lower wheel movement,
The piston rod 41 of the hydraulic cylinder is extended to lower the wheel 31 and bring it into contact with the tiller (see FIG. 4).

From this state, when the rice transplanter moves to a shallow position in the tiller, the float 2 lowers to form an oil path for moving the wheel 31 upward, and the float operating arm 53 rotates to connect with the valve operating arm 54. The locked state is released, and the valve operating arm 54 rotates until it hits the stopper 53a by the valve return spring 66, and sets the port of the switching valve 43 to the port for wheel movement, and contracts the hydraulic cylinder 41 to move the wheel 3. Move it up and place it on the shallow plowing platform (see Figure 5).

Next, when the traveling clutch operating lever 61 is set to the "off" state, the end of the operating lever 31a that engages with the groove 53b will occupy the position shown in FIG. Even if the pressure changes and a force is exerted to push up the sensing rod 51, rotation of the float operating arm 53 is prevented by the operating rod 61a. Therefore, valve actuation arm 5
4 is hooked on the stopper 53a as described above and rotates clockwise in FIG. 2, and as a result, the switching valve 43 is switched and the wheels do not move downward.

As described above, in the wheel vertical movement device according to the present invention, if the traveling clutch operating rod 61 is set to the "off" state, even if the float actuating arm 53 is pushed up by the float 2, rotation is prevented by the operating rod 61a. Even if the rice transplanter is stopped by disengaging the travel clutch and tilts forward due to its own weight, in this case the upward movement of the float 2 and the sensing rod 51 is prevented, so the above-mentioned As with the conventional structure, the wheel vertical movement device works to automatically lower the wheels.
Furthermore, the forward-leaning posture is strengthened, and as a result, there is no inconvenience that would hinder the loading of seedlings and the like.

Then, in order to put the rice transplanter into the engaged state, by turning on the travel clutch operating lever 61 and the hydraulic operating lever 62, no other operations are required, and the float pressure acting on the float 2 is immediately adjusted. The vertical movement of the wheels is automatically adjusted in accordance with the changes in the wheel.

[Brief explanation of the drawing]

The attached drawings show an embodiment of the wheel vertical movement device of a walk-behind rice transplanter according to the present invention, and FIG. 1 is a side view of the walk-behind rice transplanter, FIG. A plan view, FIG. 4 is a side view of the vertical movement device in a wheel-down state, and FIG. 5 is a side view of the vertical movement device in a wheel-up state. 1... Airframe, 11... Engine, 2... Float, 3... Swing arm, 31... Wheel, 4...
... Hydraulic cylinder unit, 50 ... Operating mechanism, 5
1... Sensing rod, 52... Pivot pin, 53... Float operating arm, 53a... Stopper, 53b...
...Guide groove, 54...Valve operating arm, 54a...Guide groove, 55...Switching rod.

Claims (1)

[Claims] 1. A walking rice transplanter comprising a rice transplanter main body having a float, a swing arm pivotally supported on the rice transplanter main body and swingable up and down, and wheels pivotally supported on the swinging end of the swing arm. The machine is equipped with an operating mechanism that detects the vertical movement of the float and operates a switching valve of the vertical movement mechanism so that the vertical movement of the swing arm is caused to move up and down in the opposite direction to the vertical movement of the float, This actuation mechanism has a valve actuation arm connected to the switching valve side and a float actuation arm connected to the float side, and both actuation arms are configured to rotate in conjunction with each other, and the float actuation arm is A wheel vertical movement device for a walk-behind rice transplanter, characterized in that it is configured so that only the rotational movement pushed up by the float in conjunction with the transmission power cutoff operation by the travel clutch is blocked.