JPH0240732Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a sensitivity adjustment device for a machine body tilt sensor in a machine body horizontal holding device of a rice transplanter.

(Prior Art) First, a conventional rice transplanter and its machine body horizontal holding device will be explained with reference to FIGS. 1 and 2.

In a conventional rice transplanter, wheels 3, 3, which are pivotally supported at the rear end of the transmission cases 2, 2, are connected to a transmission case 1, which is equipped with an engine at the front, through swing-type transmission cases 2, 2. The aircraft is driven and moves while supporting the aircraft body with floats 4, 5, 5 which are swingably attached to the aircraft body.

The transmission cases 2, 2 are similar to the transmission case 1.
It is designed to be able to swing around a pivot shaft 6 connected to the shaft, and this swing is achieved by the action of a hydraulic cylinder 7. That is, the lever 10 is pivoted to the tip of the piston 8 of the hydraulic cylinder 7 with a pin 9, and has rods 11, 11 at both ends.
It is connected to the transmission cases 2, 2 via L-shaped levers 12, 12 and rods 13, 13, and when the piston 8 of the hydraulic cylinder 7 protrudes, the transmission cases 2, 2 rotate downward, and the wheels 3, 3 descends,
When the piston 8 retracts, the transmission cases 2, 2 rotate upward and the wheels 3, 3 rise.

The hydraulic cylinder 7 has inlet/outlet holes 14, 15 at the front and back, and these inlet/outlet holes 14, 15 are connected to the pistons 17, 18, 19, 2 via the control unit 16.
0 is connected to an oil tank 21, and pressurized oil is sent from this oil tank 21 by a hydraulic pump 22 to the front entrance/exit hole 1.
4, the piston 8 retracts and the back entrance/exit hole 15
The piston 8 that enters the piston 8 protrudes.

The control unit 16 is operated by a sensor 23 shown in phantom in FIG.

That is, the upper part of the sensor 23 is pivotally attached to the fuselage, while the lower end 23a is in contact with the upper surface of the float 4, so that it swings in response to the vertical movement of the float 4. The switching valve of the control section 16 is operated through an appropriate mechanism to open the inlet/outlet hole 14 or 1 of the hydraulic cylinder 7, whichever is appropriate.
Pressure oil is sent to 5.

Therefore, the conventional aircraft horizontal holding device described above uses its sensor 23 to detect the relative positional relationship between the aircraft and the float 4, and uses this to operate the control unit 16 and operate the hydraulic cylinder 7 to move the wheels. 3,
3 to move up and down to keep the aircraft horizontal.

(Problem that the invention aims to solve) However, in the conventional aircraft horizontal holding device, the sensor 23 swings according to the vertical movement of the float 4, so the sensitivity is constant and the aircraft does not move suddenly. If the aircraft rolls too much, it will cause hunting and the aircraft will not be able to maintain a stable horizontal position.

The object of the present invention is to eliminate the above-mentioned drawbacks and to make it possible to always maintain a stable horizontal position of the aircraft without causing hunting even when the aircraft is rapidly rolling.

(Means for solving the problem) In order to achieve the above object, the present invention solves the problem by providing a sensitivity adjustment device to the aircraft tilt sensor that constitutes the aircraft leveling device. It is planned.

That is, in the present invention, a branch hole is provided in the case on both sides of the flow path leading to the hydraulic pump, which branches the flow path leading to one end and the other end of the hydraulic cylinder for adjusting the leveling of the aircraft. A switching body integrated with the pendulum body constituting the sensor is rotatably installed in this branch hole so that its flow path side is on the flow path side, and a switch body is installed on both sides of the pendulum body.
It has a configuration in which a spring is brought into contact with an adjustment screw provided on the case wall.

(Example) The illustrated embodiment will be described below.

Fig. 1 is a front view of a rice transplanter equipped with a machine body horizontal holding device of the present invention, and Fig. 2 is a schematic perspective view of the machine body horizontal holding device. Since they have the same structure, the sensor and control unit of the present invention will be described below with reference to the drawings.

In FIG. 3, 30 is a sensor. 31
is the case of this sensor 30 and corresponds to a conventional control section. That is, a branch hole 32 is provided in the upper part of the case 31, and from this, a flow path 33 leading to the hydraulic pump 22 is provided, and on both sides of the flow path 33, the front and back portions of the hydraulic cylinder 7 in the horizontal maintenance adjustment diagram of the aircraft body are provided. Channels 34 and 35 leading to the sides are branched. A pipe 20 leading to the hydraulic pump 22 is connected to the flow path 33, and a pipe 17 leading to the inlet/outlet hole 14 at the front of the hydraulic cylinder is connected to the flow path 34.
However, pipes 18 communicating with the inlet/outlet holes 15 at the back of the hydraulic cylinder are connected to the flow passages 35, respectively.

The sensor 30 is composed of a fan-shaped switching body 36 rotatably inscribed in a branch hole 32 of a case 31 and a pendulum body 37 suspended from the switching body 36. Roads 34 and 3
It looks like it's on the 5th side.

Numerals 38 and 38 are adjustment screws screwed into the side wall of the case 31, and springs 39 and 39 are stretched between the tips of the adjustment screws 38 and the pendulum body 37 of the sensor 30, respectively. Adjusting screws 38, 38 and springs 39, 39 are sensitivity adjusting devices for sensor 30.

The case 31 as described above is placed at a suitable location on the fuselage, and may be placed at the bottom of the fuselage, for example, as shown in FIG. In addition, in FIG. 1, a cover is attached to this case.

Next, the effect will be explained.

First, when the aircraft tilts forward, the pendulum body 37 of the sensor 30 swings clockwise relative to the case 31, and the pressure oil from the flow path 33 is diverted by the clockwise rotation of the switching body 36. It flows into the inlet/outlet hole 14 at the front of the hydraulic cylinder 7 through the flow path 34 and the pipe 17, the piston 8 retracts, and the wheels 3, 3 rise.

Conversely, when the aircraft tilts backward, the pendulum body 36 of the sensor 30 rotates counterclockwise relative to the case 31 and flows into the inlet/outlet hole 15 at the back of the hydraulic cylinder 7 through the passage 35 and the pipe 18. Then, the piston 8 protrudes and the wheels 3, 3 descend.

The degree of rocking of the pendulum body 36 of the sensor 30 is adjusted by the elasticity of the springs 39, 39 depending on the screwing degree of the adjustment screws 8, 8, so that even if the aircraft suddenly rolls, the pendulum body 36 of the sensor 30 The swinging motion of 37 is relaxed by the action of springs 39, 39, and hunting does not occur. Also,
Variations in sensitivity due to manufacturing errors can be adjusted using the adjustment screw 38,
38, and the sensitivity can also be further adjusted according to the degree of unevenness of the field.

In addition, in this embodiment, the pipes 17, 1
There is a check valve (not shown) at 8, and the oil returning from the cylinder 7 is passed through a bypass flow path (not shown) to a pipe 19.
The oil is returned to the oil tank 21 through the .

In the above embodiments, horizontal maintenance in the longitudinal direction of the aircraft was explained, but another sensor was arranged in the horizontal direction, and was placed at a position offset from the center of the lever 10, as shown by the imaginary line in FIG. If another hydraulic cylinder 7' is provided and operated in the same way as the hydraulic cylinder 7, the wheels 3, 3 can be moved up and down in opposite directions, so that the aircraft can be held horizontally in the horizontal direction. It can be carried out.

(Effect of the invention) The sensitivity adjustment device of the machine body tilt sensor in the body horizontal holding device of the rice transplanter of the present invention has a pendulum body and a switching body, since the sensor installed in the case is composed of a pendulum body and a switching body. The oil flow rate can be adjusted according to the amount of oscillation of the oscillator, which results in accurate control.

Further, since the pendulum body and the switching body are integrally configured, there is no time delay between the swinging of the pendulum body and the rotation of the switching body, so that control with good responsiveness can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a front view of a rice transplanter equipped with the horizontal holding device of the present invention, FIG. 2 is a schematic perspective view of the horizontal holding device, and FIG. 3 is a sectional view showing the sensor and sensitivity adjustment device. 30...Sensor, 31...Case, 32...
Branch hole, 33, 34, 35... Channel, 36... Switching body, 37... Pendulum body, 38... Adjustment screw, 39
……spring.

Claims (1)

[Scope of utility model registration request] Centering on the flow path leading to the hydraulic pump, a branch hole is provided in the case on both sides to branch the flow path leading to one end and the other end of the hydraulic cylinder for adjusting the leveling of the aircraft. , a switching body integrated with the pendulum body constituting the sensor is rotatably installed so that the flow path side is on the flow path side, and adjustment screws are provided on the case wall on both sides of the pendulum body. Sensitivity adjustment device for the machine body tilt sensor in the machine body horizontal holding device of a rice transplanter that is in contact with a spring.