JPS6269911A - Up-and-down movement controller of agricultural working machine for rice field - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vertical movement control device for a rice field agricultural machine such as a rice transplanter.

[Prior art] As a vertical motion control device for a paddy field agricultural machine, a pair of left and right hydraulic drive devices individually raise and lower the paddy wheels as needed based on changes in the ground pressure of a grounding body sliding on the surface of the topsoil. There are some that are constructed to keep the surface horizontal. In addition, in order to reduce rattling of the aircraft while it is running, there is also one in which the base of the drive device is connected to both ends of a balance rod that is swingably provided with the intermediate part as a fulcrum.

[Problems to be Solved by the Invention] However, in the above-mentioned vertical motion control device, even if the machine body tilts left and right, the hydraulic valve of the drive device will not switch unless the tilt reaches a certain level. There was a problem in that the wheels could not be raised or lowered in response to irregularities and the aircraft could not be maintained in a horizontal state. For example, in the former case where the base of the drive device is fixed to the fuselage, Fig. 5 (a)
), the drive system will not operate unless the aircraft tilts at an angle of θ or more. Here, θ is the inclination angle of the aircraft body required to switch the hydraulic valve of the drive device. In the latter case, where the base of the drive device is connected to both ends of the balance rod, as shown in Figure 5(b), the angle (0+α)
The drive device will not operate unless it is tilted more than this. Here, α is the operating range of the balance rod.

[Means for Solving the Problems] In order to solve the above problems, the present invention has the following configuration. That is, the vertical motion control device for a paddy field agricultural machine according to the present invention includes a pair of left and right paddy wheels, a grounding body provided on the side of the machine body, and a pair of left and right hydraulic type wheels that individually raise and lower the paddy wheels. When the aircraft is tilted, the valve of the hydraulic drive system is switched based on the change in the ground pressure of the grounding body, and the hydraulic drive system is expanded and contracted to raise and lower the paddy wheels and keep the aircraft horizontal. In the paddy field agricultural machine configured as follows, the bases of the pair of left and right hydraulic drive devices are attached to a movable support that is movable to raise and lower the wheels according to the unevenness of the tiller, and the movable support It is characterized by a sensitivity adjustment device that improves the ground pressure detection sensitivity of the lower ground body by moving the ground body.

[Function 1] When the tiller tilts in the direction of lateral force, the movable support for supporting the drive unit moves accordingly, creating a difference in height between the left and right wheels. At this time, the valve switching window orientation of the lower grounding body is improved, and the hydraulic valve of the drive device can be switched even if the aircraft is slightly tilted. Therefore, even if there is a difference in height in the lateral direction at Ut=, the aircraft will immediately return to the horizontal state even if it tilts slightly.

``Embodiment'' The embodiment shown in the drawings will be explained below.In this rice field farming work, 1 is placed in front of rice planting, and a pair of left and right sensors are installed at the lower part of the front of the machine body 2. Equipped with
A paddy wheel 5.5' is mounted on each side of the float.
C is being played. A prime mover 7 is provided at the front of the body 2, and a transmission case 8 for the planting portion and a handle 9 fixed at the base to the transmission case are provided at the rear end. Further, on the lower side of the planting section, a rear float 10 is provided in the center part and sight floats 11.11' are provided in the side parts.

These floats 10.11.11' have a shaft 12 at the rear.
) is rotatably attached to the entity 2, and the front part is suspended by an expansion/contraction link 13 so as to be vertically movable within a predetermined range. A transmission case 15 of the running section is provided in the middle of the body 2, and a driving lN 116 protruding left and right is provided on the transmission case 15. Rotational power from the prime mover 7 is transmitted to the drive lN 116 via a transmission mechanism within the transmission case 15. At both ends of the drive @16 are attached sprocket wheels 17a, 17a housed in 61 left pairs of cheno cases 17.17. The Cheno case 17 is attached to the end of a rotatable cylindrical housing 18 that houses a drive wheel, and the other end of the Cheno case 17 has the paddy wheel 5 (5'
) are supported, and these vehicles lt! 1
1119 (sprocket wheel 17 with 4 digits)
b is connected to the sprocket wheel 17a by a chino 21, transmitting rotational power from the drive shaft 16 to the wheels 5, 5.
′ is designed to avoid rotation.

A seedling tank 23 and a planting rod 25 are provided in the seedling planting section. A claw 25a hX is provided at the tip of the planting rod 25, and during rice planting, the claw 25a moves up and down in an elliptical orbit, and the seedling mat held in the germ tank 23 reciprocates laterally. The structure is such that the seedlings are separated and removed from the plant and then planted in the field.

Hydraulic cylinder 30°30 as a drive device for lifting and lowering wheels
' are arranged on both sides of the fuselage 20, and their bases are located at both ends of the fuselage 2 (separated at both ends of the butt balance tT31), and the respective piston rods 30a
, 30a' are connected to the tip of an arm 18a protruding from the top of the housing 18 for the drive@t+16. The balance rod 31 is a movable support for supporting the driving device, and is mounted on the front six portions of the engine stand 7a on which the prime mover 7 is placed so that it can freely rotate back and forth about the center of the rod. connected. These hydraulic cylinders 30, 30' are
The paddy wheels 5, 5' are expanded and contracted by the hydraulic pressure from the hydraulic pressure rod 1δ32 installed in the center of the machine body, and the paddy wheels 5, 5' are raised and lowered through the rotation of the Cheno case 17, 17.

The sensor float 3 (3') is for detecting unevenness of the tiller C.
The rear part is attached to the body 2 so as to be able to move up and down, and the front part is suspended and supported by the detection rod 40. The upper end of the detection rod 40 is pivotally connected to the middle part of a valve arm 42 whose front end is pivotally connected to the body 2 and is vertically rotatable. The free end of the valve arm 42 is connected via a connecting rod 44 to one end of a generally letter-shaped pivot arm 45 . The other end of the rotating arm 45 is
It is fixed to the valve shaft 47 (47M) of the switching valve V (V') of the hydraulic system 32.The rotation arm 45 is rotated by a spring 59 stretched between it and a mounting plate 58 provided on the body side.
being pulled backwards.

Further, the night float 11.11' serving as a grounding body is equipped with a switching device 61.6 for switching the valves v and v'.
1' and a sensitivity adjustment device 60 are provided. This switching device 61 (61') consists of a horizontal par 62 installed horizontally in the middle of the fuselage, arm members 63 and 64 fixed to the horizontal par 62, and a tip of the arm member 63 and a side float 11. A ground pressure detection section 66 is configured by a connecting rod 65 connecting the front end of the arm section + A64, and a switching wire of the sensitivity adjustment device 60 is attached to the tip of the arm section +A64.
One end of 67 (67') is connected. These switching wires 67, 67' are guided forward, pass through the rotating member 45 on each side, and cross each other in front of the switching wires 67, 67' to be connected to the left and right intermediate portions of the balance rod. A rotatable pin 68 is provided at the middle portion of the rotating arm 45, and a support bar 69 is provided at the rear portion of the balance rod 31. 70 (70') is provided in a relaxed state.

In the figure, 12 is a hydraulic tank, 73, 73' is a hydraulic pump, and 74 is a drive shaft for transmitting rotational power to the hydraulic pump.

The hydraulic system 32 is equipped with a pair of left and right switching valves v, v', and these switching valves PjjtV, ■' correspond to each other, respectively. It is connected to the hydraulic cylinder 30, 30' on the left side. Therefore, the left and right hydraulic cylinders 30, 30' are expanded and contracted independently of each other by switching the switching valves v, v', and the wheels 5, 5 are expanded and contracted independently through the rotation of the chain case 17, 17.
’ move up and down.

When this rice transplanter 1 is used in a paddy field, the wheels 5.degree. and 5' move on the tiller, thereby moving the machine body 2 in the advancing direction. At this point, each float slides along the topsoil surface due to its buoyancy. Here, for example, when the plowing platform becomes lower, the machine body 2 descends, but the float remains at a constant height, so the sensor float 3 (3M) has moved upward relative to the machine body 2. Then, The detection rod 40 is lifted, and the valve arm 42, the connecting rod 44, and the rotating arm 4
5, turn the valve shaft 47 (47') in the direction of arrow X.

Therefore, the switching valve V (V') of the hydraulic device 32 is switched in the direction of extending the hydraulic cylinders 30 (30') on each side, rotating the chain case 17 downward and moving the wheel 5 (5'). lower. On the other hand, when the tiller becomes high, the sensor float 3 (3') moves downward,
The valve IpH147 (47') is turned in the opposite direction of the arrow EIIX, the hydraulic cylinder 30 (30') contracts, and the wheel 5 (
5') on your back. When the height of the Senna float 3 (3') relative to the aircraft body reaches a predetermined height due to the vertical movement of the wheels, that state is maintained.

Next, when the tiller is tilted in the left-right direction, for example, when it is tilted downward to the left in the direction of travel, the left wheel 5 drops, and the lever 31, which is a movable support, rotates counterclockwise in plan view (arrow Y direction), and the switching wire 67 connected to the right side of the balance rod 31 is pulled forward. The tension of this wire pushes the night float 11 downward via the detection section 66. As a result, the ground pressure of the side float 11 increases, resulting in a tense state in which the side float 11 responds sensitively to changes in the ground pressure that are greater than that. Here (1)
When the ground pressure of the side float 11 increases due to the inclination of the board, a huge force is generated that tries to pull the switching wire A267 backward. However, since the tip of the wire 67 is fixed to the balance rod 31, it cannot be moved by the wire alone, and as a result, the outer 70 is stretched. Therefore, the rotating arm 45 is rotated in the direction of arrow X, the hydraulic cylinder 30 is extended, and the left wheel 5 is lowered. Conversely, when the tiller is tilted downward to the right, the ground pressure detection sensitivity of the right grounding body is improved, and the right wheel 5' can be quickly raised and lowered. That is, when the tiller tilts laterally, the ground pressure detection sensitivity of the switching device on the lower side improves and the rotary valve 45 on that side is quickly switched, so the machine body 2 immediately returns to the horizontal state. That's what I do.

FIG. 4 shows a different embodiment, in which this vertical movement control device has an elastic plate spring rod 80 instead of the balance rod as a movable support, and this plate spring rod 80 is attached to the central part of the lever. The base of the hydraulic drive device is connected to both ends of the hydraulic drive unit.

Switching wires 76 and 76' of the sensitivity adjustment device 60 are connected to the left and right portions of the leaf spring rod 80. Therefore, when the body is tilted, the leaf spring rod 80 deforms and the wire 7
6.76', the sensitivity of the lower valve switching device is improved as in the previous embodiment.

[Effect] As is clear from the above explanation, the vertical movement control device for paddy field layer work according to the present invention, when the plate body is laterally tilted due to the height difference of the tiller, the lower side Improves the ground pressure detection sensitivity for switching the hydraulic valve of the ground body. Therefore, the ring body is quickly returned to the horizontal position.

[Brief explanation of drawings]

FIG. 1 is a side view of an example of a rice field agricultural machine equipped with a vertical movement control device according to the present invention, FIG. 2 is a plan view thereof, and FIG.
4 is a plan view of a different embodiment, and FIGS. 5(a) and 5(b) are explanatory diagrams showing the operating range of a conventional vertical motion control device.

Claims (1)

[Claims] (1) Equipped with a pair of left and right paddy wheels, a grounding body provided on the side of the aircraft, and a pair of left and right hydraulic drive devices that individually raise and lower the rice paddy wheels, and when the aircraft is tilted,
In a paddy field agricultural machine configured to switch a valve of a hydraulic drive device based on a change in the ground pressure of a grounding body, and expand and contract the hydraulic drive device to raise and lower paddy wheels and keep the machine horizontal, the left and right The base of a pair of hydraulic drive devices,
A sensitivity adjustment device is provided, which is attached to a movable support that is movable to raise and lower the wheels according to the unevenness of the tiller, and which improves the ground pressure detection sensitivity of the lower ground contact body by moving the movable support. A vertical motion control device for agricultural machinery for paddy fields.