JPH0795886B2 - Vertical motion control device for paddy farming machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vertical movement control device for a paddy field agricultural work machine such as a rice transplanter.

[Prior Art] As a vertical movement control device for agricultural work machines for paddy fields, a pair of left and right hydraulic drive devices that operate in conjunction with vertical movement of a grounding body that contacts the surface soil surface of the paddy field are provided, and the grounding body is operated by the driving device. When there is an upward movement, the wheel on that side moves downward, and when the ground contact body moves downward, the wheel on that side moves upward. In this type of vertical movement control device, conventionally, the base of a hydraulic drive device is fixed to the machine body, and the vertical movement of the wheels is controlled only by the expansion and contraction operation of the drive device.

[Problems to be Solved by the Invention] However, the hydraulic drive system described above has a slow response because it does not operate unless a force greater than the force required to switch the hydraulic valve of the hydraulic system is applied to the grounding body. Also,
When the pressure exceeds a predetermined pressure, the vertical movement is rapidly performed, so smooth vertical movement control cannot be obtained, and there is a problem that the airframe rattles.

[Means for Solving Problems] In order to solve the above problems, the present invention has the following configuration. That is, the vertical movement control device for a paddy field agricultural work machine according to the present invention includes a pair of left and right wheels and a hydraulic drive device that raises and lowers the wheels. When the machine body tilts, the hydraulic drive device raises and lowers the wheels. In the vertical movement control device of the agricultural work machine for paddy fields configured to keep the machine body horizontal, the wheel is supported by a rocking member that rocks up and down, and a balance rod rotatable about an intermediate portion is used as a fulcrum. The balance rod is connected to the swing member so that the balance rod rotates when the installation load of the left and right wheels is changed by tilting the machine body in the left-right direction. It is characterized in that the switching valve and the balance rod are connected so that the switching valve of the hydraulic drive device is switched in a direction in which the wheel on the side on which the lateral inclination is low descends due to the movement.

[Operation] When the cultivator tilts in the horizontal direction, the load on the left and right paddy wheels changes, so the balance rod rotates, but this rotation of the balance rod lowers the wheel on the side with a lower left-right inclination. The switching valve of the hydraulic drive device is switched in the direction to move the left and right wheels up and down so that the machine body becomes horizontal.

[Examples] Examples will be described below with reference to the drawings. This paddy farming machine 1 is a rice transplanter, which has a pair of left and right sensor floats 3 and 3'at the lower front part of the body 2, and paddy wheel 5 and 5'is provided at the sides of the float. ing. A prime mover 7 is provided at a front portion of the machine body 2, and a transmission case 8 of a planting portion and a handle 9 having a base portion fixed to the transmission case are provided at a rear end portion thereof. The rear floats 10 (A) and 10 (B) are provided below the planting part. The rear float 10 (A) is a side float and is provided on each of the left and right sides of the planting portion, and only one rear float 10 (B) is provided in the center. The rear part float 10 has an intermediate part pivotally attached to the seedling planting part of the machine body 2 by a shaft 10a so as to be rotatable, and a front end part thereof hung on the machine body 2 by an expansion / contraction link 10b so as to be vertically movable within a predetermined range. There is. A transmission case 11 for the traveling portion is provided in the middle portion of the machine body 2, and the transmission case 11 is provided with a drive shaft 13 that projects left and right. Rotational power from the prime mover 7 is transmitted to the drive shaft 13 via a transmission mechanism in the transmission case 11. Sprocket wheels 17, 17 housed in a pair of left and right chain cases 15, 15 are attached to both ends of the drive shaft 13. The chain case 15 is a rocking member that rocks up and down by vertically rocking, and is attached to an end of a rotatable cylindrical housing 14 that houses a drive shaft 13 and the other end of the chain case 15. The axles 19 of the paddy wheel 5 are supported in the portion, and the sprocket wheels 20 attached to these axles 19 are connected to the sprocket wheel 17 and the chain.
The wheels 5 are connected by 21 and transmit the rotational power from the drive shaft 13
Is designed to rotate.

The seedling planting section is provided with a seedling tank 23 and a planting rod 25. A claw 25a is provided at the tip of the planting rod 25, and during the rice planting work, the claw 25a moves up and down in an elliptical orbit,
The seedlings are divided and taken out from the seedling mat held in the seedling tank 23 that reciprocates in the lateral direction, and are planted in the field.

Hydraulic cylinders 30, 30 'as a drive for lifting wheels
Are arranged on both sides of the machine body 2, and the respective bases are pivotally attached to both ends of a balance rod 31 provided at the front end of the machine body 2, and the respective piston rods 30a, 30a 'are connected to the drive shaft 13a. It is connected to the tip of an arm 14a protruding above the housing 14 for use with. The balance rod 31 is connected to the front end portion of the engine base 7a on which the prime mover 7 is mounted so as to be rotatable back and forth with the central portion as a fulcrum. These hydraulic cylinders 30 and 30 'are the hydraulic devices 3 installed in the center of the machine.
It is expanded and contracted by the hydraulic pressure from 2, and the paddy wheel 5 is raised and lowered through the rotation of the chain case 15.

The rear part of the sensor float 3 (3 ') as a grounding member on the soil surface of the paddy field is pivotally attached to the body 2 so as to be vertically movable, and the front part is supported by the detection rod 40 in a suspended state. The upper end portion of the detection rod 40 is pivotally attached to the middle portion of a vertically rotatable valve arm 42 whose front end portion is pivotally attached to the machine body 2. The free end of the valve arm 42 is connected via a connecting rod 44 to one end of a generally U-shaped pivot arm 45. The rotating arm 45 has an intermediate portion fixed to the valve shaft 47 (47 ') of the switching valve V (V') of the hydraulic device 32, and the connecting rod 44 of the connecting rod 44 is sandwiched by the valve shaft 47 (47 '). One end of the wire 49 (49 ') is attached to the side opposite to the connecting point. The left and right wires 49, 49 'are guided forward and connected to the projecting members 50, 50 provided on the rear side of the balance rod 31. The projecting member 50 is rotatably attached to both ends of the support bar 51 at its intermediate portion by pins 52, and when the balance rod 31 is in parallel with the support bar 51, its front end is behind the balance rod 31. It is provided so as to be located at a slight interval. The wire 49 (49 ') is connected to the rear end of the protruding member 50. A return spring 56 is loosely fitted around the wire between the support plate 55 that supports the outer wire 54 and the rear end of the protruding member 50.
The rear end portion of the protruding member 50 is biased forward by 56. The rotating arm 45 is pulled rearward by a spring 59 stretched between the rotating arm 45 and a mounting plate 58 provided on the machine body side.

In addition, 61 in the drawing is a side float 10 (A) mounted and 4
A connecting rod for transmitting the vertical movement of the side float to the switching valve V (V ') when rowing or the like, 62 is a hydraulic tank, 63 and 63' are hydraulic pumps, 64 is rotational power to the hydraulic pumps. Is a drive shaft for transmitting the.

The hydraulic device 32 includes a pair of left and right switching valves V and V ', and the hydraulic cylinders 30 and 30 on the sides to which the switching valves V and V'correspond, respectively.
It is connected to 30 '. Therefore, the left and right hydraulic cylinders 30, 30 'are independently expanded and contracted by the switching operation of the switching valves V, V', and the wheels 5, 5'are moved up and down through the rotation of the chain cases 15, 15.

When the rice transplanter 1 is used in a paddy field, the wheels 5 and 5'roll on the cultivator to move the machine body 2 in the traveling direction.
At this time, each float slides along the surface soil surface due to buoyancy. Here, for example, when the cultivator becomes lower, the machine body 2 descends, but since the float is kept at a constant height, the sensor float 3 (3 ') has moved upward with respect to the machine body 2. Then, the detection rod 40 is lifted, and the valve shaft 47 (47 ') is rotated in the arrow X direction via the valve arm 42, the connecting rod 44, and the rotating arm 45. Therefore, the switching valve V (V ') of the hydraulic device 32 is switched to the direction in which the hydraulic cylinder 30 (30') on each side is extended, and the chain case 15 is rotated downward to rotate the wheel 5 (5 '). To lower. On the contrary, when the tiller becomes high, the sensor float 3 (3 ') moves downward, so the valve shaft 47 (47') is rotated in the opposite arrow X direction, and the hydraulic cylinder 30 (30 ') contracts. Then, the wheel 5 (5 ') is raised. When the height of the sensor float 3 (3 ') with respect to the machine body reaches a predetermined height due to the vertical movement of the wheels, that state is maintained.

Next, when the cultivator is tilted in the left-right direction, for example, when the vehicle descends leftward in the traveling direction, the left sensor float 3 moves upward to extend the left hydraulic cylinder 30. However, since the switching valve V does not switch until the sensor float 3 moves upward by a certain amount or more, the aircraft tilts to the left while the balance rod 31 rotates counterclockwise in plan view (direction of arrow Y). . Then, the left side protruding member 50 is pushed by the rear surface of the balance rod 31 and rotates in the arrow Z direction with the pin 52 as a fulcrum, so that the rear end portion of the protruding member 50 moves forward and the wire 49 is pulled. Then, the rotating arm 45 is rotated in the arrow X direction by the tension of the wire 49, the hydraulic cylinder 30 is extended, and the left wheel 5 is lowered. That is, the force of switching the switching valve V is transmitted to the rotating arm 45 by the functions of the balance rod 31 and the projecting member 50 that immediately rotate when the cultivator tilts in the lateral direction. The left wheel 5 is instantly lowered, and the machine body 2 is returned to the horizontal state. On the contrary, when descending to the right in the traveling direction, the balance rod 31 rotates clockwise (in the opposite arrow Y direction) to extend the right hydraulic cylinder 30 'and lower the right wheel 5'. In this way, by using the rotation of the balance rod 31 to switch the switching valves V, V ′ of the hydraulic device 32, it is possible to sensitively react with the unevenness of the cultivator to control the lifting and lowering of the wheels. This has made it possible to improve the runnability of agricultural work machines and keep the planting depth of seedlings constant at all times.

Instead of installing a pair of sensor floats on the left and right,
As shown in the figure, a large sensor float 70 may be provided in the center, and detection rods may be attached to both sides of the sensor float 70 to detect the inclination of the tiller.

Further, in some cases, the detection rod, the valve arm, the connecting rod, etc. may be omitted, and the vertical movement of the wheel may be controlled only by the rotation of the balance rod.

[Effects] As is clear from the above description, the vertical movement control device for a paddy field agricultural working machine according to the present invention utilizes the operation of a balance rod that oscillates sensitively to the height of a cultivator, and is a hydraulic device. Since the switching valve is configured to be switched, the wheels can be lifted and lowered accurately and smoothly, and the traveling and maneuverability of the agricultural work machine are improved.

[Brief description of drawings]

FIG. 1 is a side view of a paddy field agricultural working machine provided with an example of a vertical movement control device according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is an enlarged view of a main part of a side surface, and FIG. Enlarged view of the main part of the plane,
FIG. 5 is an explanatory view showing the configuration of the vertical movement control device, and FIG. 6 is a plan view of an agricultural working machine showing a different embodiment. 1 ... Agricultural work machine for paddy field, 2 ... Machine body, 3, 3 '... Sensor float (grounding body), 5, 5' ... Wheel, 15 ... Chain case, 30, 3
0 '... cylinder (driving device), 31 ... balance rod, 32 ... hydraulic device, 40 ... detecting rod, 42 ... valve arm, 44 ... connecting rod, 45 ... rotating arm, 49,49' ... wire (coupling means) ,Five
0 ... Projecting member, V, V '... Valve

Claims (1)

[Claims] 1. A pair of left and right wheels and a hydraulic drive device for raising and lowering the wheels are provided, and when the machine body tilts, the hydraulic drive device raises and lowers the wheels to keep the machine body horizontal. In a vertical movement control device for a paddy field farming machine, the wheel is supported by a swinging member that swings up and down, and a balance rod that is rotatable around an intermediate portion is provided. While connecting the balance rod and the swing member so that the balance rod rotates when the ground load of the
The changeover valve and the balance rod are connected so that the changeover valve of the hydraulic drive device is changed over in the direction in which the wheel on the side with a lower rightward and leftward inclination is lowered by the rotation of the balance rod when the machine body is inclined left and right. Vertical movement control device for agricultural work machines for paddy fields.