JPS6223286Y2 - - Google Patents

Description

[Detailed description of the invention] The invention supports the left and right paddy wheels through a swing case, for example, so that they can move in and out of the fuselage, and
This invention relates to a body control device for a rice transplanter in which the support heights of the left and right bodies are made different by varying the amount of movement in and out of the left and right sides.

Previously, Utility Model Publication No. 18812 (1977) and Japanese Patent Application Publication No. 1888 (1972)
As shown in the publications of No. 166502, there was a technology that was equipped with a tilt sensor to detect the left and right tilt of the aircraft body, and a technology that operated a rolling control cylinder to relatively vary the amount of entry and exit of the left and right paddy wheels.

However, in the prior art, since the inclination sensor is directly connected to the hydraulic switching spool that controls the operation of the cylinder, the output of the sensor cannot be easily amplified, and the spool switching sensitivity cannot be easily improved. There were some functional issues such as:

However, the present invention provides an apparatus that includes an inclination sensor that detects the left and right inclination of the machine body, and operates a rolling control cylinder based on the output of the sensor to relatively vary the amount of entry and exit of the left and right paddy wheels. A nozzle flapper is provided to adjust the back pressure of a hydraulic switching spool for controlling the operation of the nozzle flapper, the flapper of the nozzle flapper is interlocked with the inclination sensor, and the back pressure of the spool is changed by the flapper interlocked with the sensor to switch the spool. It is characterized by being configured to allow for

Therefore, the output of the inclination sensor can be amplified by the nozzle flapper and transmitted to the spool, improving the spool switching sensitivity and obtaining good responsiveness of the cylinder, as well as adjusting the position of the flapper. Therefore, proper horizontal control can be performed,
The horizontal control function is improved compared to the conventional one, and miniaturization and high precision can be easily achieved.

Embodiments of the present invention will be described in detail below based on the drawings. FIG. 1 is a schematic side view of the whole, in which 1 is an engine, 2 is a transmission case, 3 is a planting transmission case, and 4 is a rice field supported on both sides of the transmission case 2 via swing cases 5. wheels; 6 is a float that supports the aircraft body consisting of the engine 1 and the cases 2 and 3 via a planting depth adjustment link 7 and a buffer member 8; 9 is a steering handle connected to the rear end of the transmission case 3; , 10 is a guide member 11,
12 is a seedling stand installed along the case 3 and the upper part of the handle 9 and reciprocated from side to side with a low front and back height; 13 is a seedling stand 10 that is attached to the transmission case 3 via a crank arm 14; This is a planting claw that takes out one seedling and plants it.

As shown in FIGS. 2 and 3, a hydraulic case 15 is mounted on the upper surface of the transmission case 2, and the drive pulley 16 of the case 15 is always interlocked and connected to the output pulley 17 of the engine 1 via a V-belt 18. At the same time, a hydraulic cylinder 20 for projecting the piston rod 19 to the rear of the aircraft body is assembled into the hydraulic case 15, and the tip of the piston rod 19 supports the middle of a swing plate 22 via a swing fulcrum shaft 21, and a neutral holding spring is attached to the plate 22. 23 is energized. Further, both ends of the swing plate 22 are connected via swing rods 25, 25 to swing arms 24, 24 which are integrally connected to the base ends of the left and right swing cases 5, 5, and the piston rod 19
A rolling control cylinder 26 is a rolling control device that moves the left and right paddy wheels 4, 4 in and out simultaneously by moving them forward and backward, and also regulates the swinging of the swing plate 22 about the swinging fulcrum shaft 21.
The piston rod 19 and swing plate 2
The piston rod 19 and the swing plate 22 are fixed in position via the cylinder 26 when traveling on the road, etc., and the left and right paddy wheels 4, 4 are supported at approximately the same height. The piston rod 27 of the cylinder 26 is expanded and contracted appropriately according to the unevenness of the tiller in the field, so that the support heights of the left and right paddy wheels 4, 4 are varied, so that the machine body is supported substantially horizontally.

Further, a hydraulic switching shaft 28 and a hydraulic switching arm 29 for driving and controlling the hydraulic cylinder 20 are attached to the hydraulic case 15, and an L-shaped automatic lifting link 31 is attached to one side of the cylinder 20 via a support shaft 30. A hydraulic switching arm 29 is connected to one end of the link 31 by a connecting rod 32, and an upper end of an automatic lifting rod 33 is connected to the other end of the link 31. The lower end of the automatic lifting rod 33 is inserted into the bearing sleeve 34, and the rod 33 and the bearing sleeve 34 are connected by a shock absorbing spring 35.
A bracket 36 is fixed to the float 6, and when the float 6 moves up and down due to the expansion and contraction of the buffer member 8, the link 31 and the rod 3
2 and 33, the hydraulic cylinder 20 is driven to move the piston rod 19 forward and backward, and the paddy wheel 4 is adjusted in and out to keep the ground pressure of the float 6 substantially constant.

As shown in FIG. 4, the hydraulic cylinder 20 is connected to a hydraulic pump 38 via a four-way valve 37, and the discharge side of the pump 38 and the hydraulic oil tank 39 are connected to each other via a four-way valve 37.
A relief valve 40 is provided between them. Further, a nozzle flap two-stage valve 43 composed of a nozzle flapper 41 and a guide valve 42, which is an output amplification mechanism, is connected to the discharge side of the hydraulic pump 38.
The discharge side of the cylinder is connected to the rolling control cylinder 26.

The flapper 44 of the nozzle flapper 41 is attached to a fulcrum shaft 45 that is fixedly supported on the aircraft body, and the flapper 44 is fixed to a weight body 46 that is a tilt sensor that is swingably supported on the shaft 45. When the gap between the nozzle 47 and the flapper 44 changes due to the left and right tilt of the aircraft, and the back pressure on the narrow side is large and the back pressure on the wide side is small, Even with differential pressure, the guide valve 4
The spool 48 in the paddy field wheel 2 is moved from the neutral position, and pressure oil is supplied to the hydraulic cylinder 26 until the hydraulic pressures of both are balanced, thereby adjusting the amount of movement in and out of the left and right paddy wheels 4, 4. It is. In addition, numeral 49 in FIG. 1 is a sensor box in which the weight body 46 is housed.

On the other hand, the center marker 50 to be equipped on the aircraft,
Fluorescent paint A is applied to each tip mark portion 50a, 51a, 52a of the side marker 51 and line marker 52, so that the mark portions 50a, 51a, 52a can be easily confirmed from the working position at dusk or on cloudy days. It is configured so that it can be done.

The present invention is constructed as described above, and in the state shown in FIG.
The rice planting work is carried out continuously by driving the planting claws 13 and turning them back, and when the machine body is tilted due to unevenness in the current field, the two-stage valve 43 also tilts accordingly. Due to the action of the weight body 46, the gap between the flapper 44, which is always maintained in a vertical state, and the nozzles 47, 47 arranged on both sides thereof changes, and a hydraulic pressure difference proportional to the inclination of the flapper 44 changes, and the spool 4
This occurs in the back pressure chamber of 8. As a result, the spool 4
8 slides to the right or left, the pressure oil sent from the pump 38 is supplied to the rolling control cylinder 26, and the piston rod 27 of the cylinder 26 is extended or retracted to move the left and right paddy wheels 4, 4 relative to each other. It is designed to hold the aircraft approximately horizontally by adjusting the angle of entry and exit.

When the machine body is approximately horizontal, the gap between the flapper 44 and the nozzles 47, 47 becomes equal, and the back pressures on the left and right sides are also balanced, and the spool 48 is stationary at the center position. cylinder 2
Cut off the pressure oil supply to 6.

Further, by applying fluorescent paint to the mark portions 50a, 51a, 52a of the markers 50, 51, 52 during work, the markers 50, 51, 52 are easy to see during work, and it is possible to easily and reliably move straight ahead. In addition, since it only requires applying paint, it is easy to manufacture, economical, and does not break down.

As is clear from the above embodiments, the present invention is equipped with an inclination sensor 46 that detects the left and right inclination of the machine body, and operates the rolling control cylinder 26 based on the output of the sensor 46 to control the amount of movement of the left and right paddy wheels 4, 4. In a relatively variable device, a nozzle flapper 4 adjusts the back pressure of a hydraulic pressure switching spool 48 that controls the operation of the rolling control cylinder 26.
1 is provided, and the flapper 4 of the nozzle flapper 41 is provided.
4 is interlocked and connected to the inclination sensor 46, and the back pressure of the spool 48 is changed by the flapper 44 interlocking with the sensor 46 to switch the spool 48.The output of the inclination sensor 46 is connected to the nozzle flapper 41 can be amplified and transmitted to the spool 48, improving the switching sensitivity of the spool 48 and obtaining good responsiveness of the cylinder 26. It is possible to perform horizontal control, and has practical effects such as improved horizontal control function compared to the past, and easy to achieve miniaturization and high precision.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is a side view of the whole, Fig. 2 is a side view of the main parts, Fig. 3 is a plan view of the same, and Fig. 4 is a system explanation of the main parts. It is a diagram. 4...Paddy wheel, 26...Rolling control device (cylinder), 41...Output amplification mechanism, 46...Inclination sensor.

Claims (1)

[Scope of utility model registration request] It is equipped with an inclination sensor 46 that detects the left and right inclination of the aircraft body, and operates the rolling control cylinder 26 based on the output of the sensor 46, and controls the left and right paddy wheels 4, 4.
In this device, a nozzle flapper 41 is provided to adjust the back pressure of a hydraulic switching spool 48 that controls the operation of the rolling control cylinder 26, and a flapper 44 of the nozzle flapper 41 is interlocked and connected to the tilt sensor 46. let me,
A body control device for a rice transplanter, characterized in that the device is configured to switch the spool 48 by changing the back pressure of the spool 48 by means of a flapper 44 interlocking with the sensor 46.