JPH0218974Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is such that a rice transplanting machine equipped with an engine, a seedling stand, etc. is supported on paddy wheels so that it can rise and fall, and the machine is lifted up and down against the wheels using hydraulic pressure or the like. The present invention relates to a paddy field traveling device for agricultural machinery such as a rice transplanter or a flooded direct sowing machine, which performs rice planting work while maintaining a constant slip rate.

According to the present invention, a sensor that detects changes in water depth is interlocked with a wheel swing device and the slip rate of the wheel is controlled at a constant level. When the ground resistance of the float increases and the wheel slip rate increases, the aircraft is automatically raised to reduce the ground resistance of the float, and the wheel slip rate increases. By reducing the slip rate and keeping the slip rate constant, the spacing between seedlings can be kept constant even when field conditions change, and the desired number of seedlings to be planted can be accurately planted within a certain field range using a specified amount of seedlings. It is an object of the present invention to provide a running device for agricultural machinery for paddy fields, which can perform various planting and sowing operations such as rice planting and sowing in a highly efficient manner.

An embodiment of the present invention will be described in detail below with reference to the drawings. Figure 1 is a schematic side view of the 4-row rice transplanter, Figure 2
The figure is a plan view of the same. In the figure, 1 is the engine, 2 is the machine base on which the engine 1 is mounted, 3 is the main transmission case fixed to the rear end of the machine base 2, and 4 is the main transmission case 5. a planting transmission case fixed to the transmission case 3; 6 a planting claw driving case supported on both sides of the planting transmission case 4; 7 a steering handle whose base end is connected and supported to the case 4;
Reference numeral 11 indicates a rear-tilt seedling stand with a low front and rear height, which is installed along the upper surface of the handle 7 via a guide rail 9 and a sliding rail 10 and reciprocated from side to side; 12 is a bonnet that covers the upper surface of the engine 1 and each of the cases 3, 4, and 5; 13 is a side cover; 14 is a preliminary seedling support installed on the upper surface of the bonnet 12 via a support 15; 16 is a paddy wheel attached to both sides of the main transmission case 3 via a swing case 17; 18 is the engine 1 and each case 3, 4;
5 a main float supported downward, 19 side floats provided on both sides of the main float 18, 20 a recoil start handle, 21 a traveling gear shift lever, 22 a main clutch lever, 23 a wheel entry/exit lever, and 24 a side clutch lever. be.

As shown in FIGS. 3 and 4, the engine 1
A hydraulic pump 25 is mounted on the top surface of the machine base 2 between the main transmission case 3 and the output pulley 26 of the engine 1.
The drive pulley 28 of the hydraulic pump 25 is connected via a V-belt 27 to the drive pulley 28 of the hydraulic pump 25, and the drive pulley 31 of the main transmission case 3 is interlocked via a V-belt 30 to an intermediate pulley 29 integrally formed with the pulley 28. A main clutch pulley 32 for tensioning the V-belt 30 is supported by a tension arm 33 so as to be movable toward and away from the main clutch pulley 32.

An electromagnetic/manual hydraulic switching valve 34 is installed above one side of the hydraulic pump 25, and a hydraulic cylinder 35, which is a swing device, is fixedly installed on the machine base 2 below the pump 25. The switching valve 34 is hydraulically connected, and high pressure oil from the hydraulic pump 25 is applied to the hydraulic cylinder 35 via the hydraulic switching valve 34. A hydraulic operating shaft 37 interlocked and connected to a spool (not shown) of the hydraulic switching valve 34
A wheel in/out lever 23 is connected to the hydraulic cylinder 3 via a connecting rod 38, and a hydraulic cylinder 3 is connected via the lever 23.
5 to be manually operated.

The middle of an L-shaped lift arm 40 is supported via a fulcrum shaft 39 on both rear sides of the main transmission case 3, and a suspension rod 41 is attached to the swing case 17.
and a swing frame 42 to the other end of the lift arm 40.
At the same time, a swing plate 44, which is a swing member, is connected to the long groove 43 on the side surface of the machine stand 2.
is loosely inserted, and the tip of the piston rod 45 of the hydraulic cylinder 35 is connected to the middle of the plate 44 via a pin 46, and the middle of the round bar spring 47, which is a swing spring bar, is pressed against the pressure receiving curved surface 44a of the swing plate 44. The rice paddy wheels 16, 17 are fixed via a plate 48, and the left and right swing frames 42, 42 are connected and supported by both ends of the round bar spring 47, and the piston rod 45 is advanced and retreated to raise and lower the swing cases 17, 17 as appropriate. The structure is such that 16 can be entered and exited.

The main and side floats 18, 19 are supported at the lower part of the fuselage via a planting depth adjustment link 49 and a buffer member 50, and bolts 52 are attached to the mounting bracket 51 of the side float 19 that connects and supports the buffer member 50. A sensor arm 53, which is a field water depth detection sensor, is fixed so that the distance from the water surface can be adjusted freely, and when the arm 53 is away from the water surface, the solenoid 54 of the hydraulic switching valve 34 is energized to the side of raising the body, The swing case 17
It is configured to descend.

FIG. 5 shows a control circuit diagram thereof, in which a relay 56 and a drive circuit 57 are interposed in the connection circuit between the sensor 53 and the battery 55, and a relay switch 56a of the relay 56 is connected to the switching valve 34. The solenoid 54 is connected to the circuit, and when the tip of the sensor, that is, the sensor arm 53 is away from the water surface and becomes de-energized, the drive circuit 57 is operated to energize the solenoid 54, and the piston rod 4 of the hydraulic cylinder 35 is activated.
By extending 5, the swing case 17
The wheels 16 are configured to protrude downward from the fuselage body.

In this embodiment, the structure is as described above, and the rice planting work is carried out continuously by taking out one seedling with the planting claw 11 from the seedling platform 8 which is moved back and forth from side to side. If the working conditions change to a field where the water depth is shallower than usual and there is almost no water, the tip of the sensor arm 53 will be separated from the water surface of the field and the current from the battery 55 will not be grounded from the sensor arm 53. state, the drive circuit 57 is activated and the relay 56 is activated. As a result, the relay switch 56a is turned on, the solenoid 54 is energized, the piston rod 45 of the hydraulic cylinder 35 is extended, and the swing plate 4
4. The swing case 17 is lowered via the swing frame 42, lift arm 40, and suspension rod 41, causing the wheels 16 to protrude below the fuselage. In other words, the system pulls the aircraft upward together with the floats 18 and 19 to reduce the ground resistance of the floats 18 and 19. By keeping the sensor arm 53 in constant contact with the water surface, the floats 18 and 19 The ground resistance is made substantially constant, and the running resistance is kept substantially constant, so that the slip rate of the wheels 16 is kept constant.

FIG. 6 shows another modified structure, in which a float-shaped float sensor 53a is displaceably attached to the bracket 51 of the float 19 via an arm 58, and the displacement operation of the sensor 53a is also effective. The switching valve 34 is configured to perform a switching operation, and in this configuration, it is also possible to mechanically operate the switching valve 34 by the movement of the sensor 53a itself.

In addition, in the above-mentioned embodiment, a configuration was shown in which the aircraft is raised when the water depth becomes shallower than a certain level, but in combination with the sensor 53, when the water depth becomes deeper than a certain level, the shared load of the floats 18 and 19 is reduced. In order to increase the load shared by the wheels 19, a sensor for the lower limit water depth for moving the body upward may be installed, and the slip rate may be controlled at a constant level even when the water depth becomes deeper.

As is clear from the above embodiments, in the present invention, the sensors 53, 53a for detecting changes in water depth are connected in conjunction with the swing device 35 of the wheel 16 to control the slip rate of the wheel 16 at a constant level. In particular, in a walk-behind rice transplanter, when the water depth on the rice field is almost at a point, the ground resistance of the floats 18 and 19 increases, and the slip rate of the wheels 16 increases. It is possible to raise the ground resistance of the floats 18 and 19 and reduce the slip rate of the wheels 16. As a result, the slip rate can be kept constant at all times, and even if field conditions change, seedlings can be planted. It is possible to accurately obtain the desired number of plants to be planted in a certain field with a specified amount of seedlings or seed rice by keeping the seed spacing or seed rice sowing interval constant, making it possible to perform extremely efficient planting work. It has a great effect.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of a rice transplanter showing an embodiment of the present invention, Fig. 2 is a plan view of the same, Fig. 3 is a side view of the main parts, Fig. 4 is a plan view of the same, and Fig. 5 is an electrical The circuit diagram and FIG. 6 are explanatory diagrams showing another modified structure. 16...Wheel, 35...Swing device, 53,
53a... (water depth) sensor.

Claims (1)

[Scope of utility model registration request] 1. A running device for agricultural machinery for paddy fields, characterized in that a sensor for detecting changes in water depth is interlocked with a wheel swing device to control the slip rate of the wheel at a constant rate.