JPH0671370B2 - Paddy farm work machine - Google Patents

Description

The present invention relates to a traveling device for a paddy field agricultural working machine such as a single-wheel rice transplanter.

A traveling device for agricultural work machines for paddy fields such as rice transplanters has a float that slides on the surface soil and wheels that roll on the cultivator.To adjust the height of the soil according to the height of the cultivator, the surface soil surface is adjusted. It is generally equipped with a lifting device that detects the vertical movement of the float gliding above and lowers the wheel when the float moves upward with respect to the aircraft, and pulls the wheel up when the float moves downward. Target. However, the one-wheel type rice transplanter has a problem that the floats on the left and right move up and down with respect to the body because the body needs to be largely tilted when turning, and thus the lifting device malfunctions. Was bad.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a paddy field agricultural working machine that is excellent in operability during turning.

That is, the paddy field agricultural working machine according to the present invention is a paddy wheel that is moved up and down by a hydraulic cylinder device that is operated by switching a switching valve of a hydraulic device, and is vertically movably attached to the machine body and floats above the surface soil surface of the paddy field In a paddy farming machine equipped with a pair of left and right sliding gliding floats and a steering handle provided at the rear of the machine body, a movable member is provided that is activated only when both the left and right floats move up or down at the same time. A buffer for absorbing the moving amount of the movable member and the valve switching member connected to the switching valve and provided so as to be movable only within a certain range when the left and right floats are moved upward by a predetermined amount or more. It is characterized by being installed through the construction machine.

Hereinafter, the present invention will be specifically described based on the embodiments shown in the drawings.

FIG. 1 is a side view showing an example of a single-wheel type rice transplanter equipped with a traveling device according to the present invention, FIG. 2 is a plan view thereof, and FIG.
FIG. 4 and FIG. 4 are an enlarged side view and a plan view of the main part. This one-wheel type rice transplanter 1 is configured by connecting a front power unit 2 and a rear planting unit 3 with a frame 4, and a pair of left and right floats 6, 6 has a rear portion of the planting unit 3 in a transmission case described later. It is provided in a state in which it is pivotally attached (P) to the front portion and is movably pinned to the frame 4 by a support member 6a having a long notch.

The power unit 2 is provided with an engine 7, a fuel tank 8, a mission case 9 and a hydraulic pump 10, and a chain case 11 whose base is pivotally attached to a side surface of the mission case 9.
Is extended to the rear. At the back of the chain case 11,
Wheels 14 located in the center of the machine are pivotally supported. The upper portion of the chain case 11 is supported by the lifting device 15, and the lifting device 15 allows the chain case 11 to be rotated vertically with respect to the machine body.

The transmission case 17, which also serves as the machine frame of the planting section 3, has a pair of left and right handles 18, 1 protruding rearward from the lower portion of the transmission case.
8 is provided, and in front of it, a seedling tank 19 that is inclined so that its rear end portion is positioned higher is provided along the handle 18. The seedling tank 19 is movably supported to the left and right, and reciprocates by the power transmitted from the power unit 2 to the transmission device in the transmission case 17 via the transmission shaft in the frame 4. During the planting work, the planting tool 20 swings vertically in an elliptical orbit, and plants the seedlings supplied from the seedling tank 19 one by one in the soil. Further, 21 is a spare seedling placing table, which is a column 21a protruding upward from the frame 4
Supported by.

The lifting device 15 detects the vertical movement of the float 6 and the actuator 23 that lifts and lowers the wheels 14 by the action of the hydraulic cylinder 22,
It is composed of a control device 24 for performing a valve switching operation for the hydraulic cylinder 22. A rear portion of the hydraulic cylinder 22 of the actuating device 23 is pivotally attached to the lower side of the frame 4, and a piston rod 26 projects forward from the hydraulic cylinder 22.
A spring 27 is loosely fitted to the front part of the piston rod 26,
Further, a cylinder 28 is fitted to the tip of the cylinder 28 so as to be slidable back and forth. An upper end portion of an operating arm 30 pivotally attached to a side portion of the cylindrical body 28 is pivotally attached to a machine frame, and a first operating rod 32 is integrally provided rearwardly on the upper end portion. ing. Further, a second operating rod 33 is rotatably connected to the tip end portion of the first operating rod 32. The tip of the second actuating rod 33 is pivotally attached to a protrusion 34 provided on the upper portion of the chain case 11.

On the other hand, the control device 24 has a sensor rod 36 pivotally attached to the tip of the float 6, whereby the float 6
Is configured to detect the vertical movement of the. Below the fuel tank 8, a rotary shaft 37 is horizontally supported by the machine frame,
A valve drive arm 39 is provided with a pin 40 at the right end of the rotary shaft 37.
Installed by. The rotating shaft 37, the valve drive arm 39, and the like are movable members that operate only when the left and right floats move up and down at the same time. The connecting arm 42, which is rotatably fitted onto the rotating shaft 37 and whose other end is connected to the upper end of the sensor rod 36, has a longitudinal slot 42a in the center thereof. Long holes for left and right connecting arms 42
Both ends of the swing rod 43 are loosely fitted in the a and 42a.
The rocking rod 43 has a cylindrical body 44 fixed to the center thereof, and has a rotating shaft 37.
It is rotatably supported around the projection shaft 45 by a projection shaft 45 which is provided so as to project at the center position of the projection shaft 45 and which is fitted into the cylindrical body 44. The valve drive arm 39 has a circular arc-shaped guide hole 39a at its lower end with respect to the center of rotation of the valve drive arm 39.
A hook-shaped front end portion 47a of the valve connecting rod 47 is loosely fitted in. The front end portion 47a of the valve connecting rod 47 is
The valve drive spring 48 is wound around the shaft portion 39b of the valve drive arm 39 so as to be biased rearward, and is normally locked to the rear end portion of the guide hole 39a. A sliding cylinder 51, which is biased forward by a valve return spring 50, is fitted on the valve connecting rod 47. Sliding cylinder
Valve actuation rod 52 fixedly mounted on the side of 51
Is connected to the tip of a valve switching member (valve arm) 54 that operates the valve of the hydraulic cylinder 22. Furthermore, a rod 55 is connected to the intermediate portion of the valve arm 54,
The rod 55 is connected via a wire 56 to a hydraulic lever 57 attached to the handle grip 18a.

The vertical movement of the float 6 with respect to the machine body caused by the height of the cultivator in the field or the like is transmitted as the rotation of the rotation shaft 37 via the sensor rod 36, the connecting arm 42, and the swing rod 43. For example, if the float 6 moves up against the airframe,
The connecting arm 42 rotates upward, the swing rod 43 is lifted up accordingly, and the rotating shaft 37 rotates counterclockwise. However, if one float moves up and the other floats down, such as when turning, that is, if the height of the body does not change but only tilts, the swing rod 43 is The pivot shaft 37 does not pivot only by pivoting around 45. Therefore, even when turning, the left and right floats 6, 6, which are independently movable up and down, can always slide on the surface soil surface having a constant height. Next, the cultivator is lower than the surroundings and the floats on the left and right
The operation of each part of the lifting device 15 will be described by taking the case where both 6 and 6 move up.

As described above, when the left and right floats 6 move together, the rotation shaft 37 rotates counterclockwise in the figure. At this time, the rotary shaft 37
The valve drive arm 39, which is integrated with the valve drive arm, also rotates counterclockwise, and the valve connecting rod 47 urged by the valve drive spring 48 is pushed backward. When the locking ring 47b of the connecting rod 47 comes into contact with the sliding cylinder 51, the valve operating rod 5
2 is pushed backwards, causing the valve arm 54 to pivot backwards. This switches the switching valve,
Hydraulic pressure is supplied to the hydraulic cylinder 22 and the piston rod 26
Projects forward. This protrusion of the piston rod 26 is transmitted to the cylindrical body 28 via the spring 27 and rotates the operating arm 30 and the first operating rod 32 clockwise, so that the second operating rod 33 moves downward. The chain case 11 is pushed down. In this way, when the wheel 14 descends, the resistance from the surface soil surface to the float 6 decreases, and each part of the control device 24 returns to its original state. Further, the sliding cylinder 51 is returned to its original position by the repulsive force of the valve return spring 50, and the supply of further hydraulic pressure to the hydraulic cylinder 22 is stopped.

The elevating device is provided with a buffer mechanism for absorbing a sudden vertical movement of the float 6. That is, when the amount of rise of the float 6 exceeds a predetermined value, the valve connecting rod 47
The front end 47a of the slot 39a against the valve drive spring 48.
Of the valve drive spring 48
It is structured to be absorbed by. Further, a play t is provided between the sliding cylinder 51 and the locking ring 47b so that a slight vertical movement of the flow is not applied to the valve arm 54. Further, the spring 27 of the piston rod 26 also serves to absorb the shock, whereby the wheel 14 is smoothly lowered.

The movable range of the valve arm 54 is restricted to a small range by the stoppers 54a and 54a 'in order to quickly switch the valves. However, since the buffer mechanism as described above is provided, a large movement of the float 6 is prevented. It can be absorbed well.

When the left and right floats 6, 6 move downward, the respective parts of the lifting device 15 perform the reverse operation to the above, and the wheels are pulled up.

At the end of work, operate the hydraulic lever 57 at hand to
You can lower 14 and raise float 6 higher from the ground. The hydraulic lever 57 is provided in the vicinity of the handle grip 18a, and the hydraulic operation can be performed while holding both handles 18, 18, which is convenient and safe for driving. In addition, a lock device that can hold the valve arm 54 in the neutral position (N) is provided with a hydraulic lever.
If it is provided in 54, the wheels 14 are kept at a constant height even if the hydraulic lever 57 is released during traveling, which is convenient for driving.

As is clear from the above description, the paddy field agricultural working machine according to the present invention is configured to raise and lower the wheels only when the left and right floats move up and down at the same time. In addition, it is possible to make a smooth turn by inclining the body without unnecessarily raising and lowering the wheels when turning. Further, by keeping the movement amount of the valve arm, which is the valve switching member, within a small range, it becomes possible to absorb a large vertical movement of the float by the cushioning mechanism while maintaining the quickness of response.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a single-wheel type rice transplanter equipped with a traveling device according to the present invention, FIG. 2 is a plan view thereof, and FIG.
(A), (b) and FIG. 4 are an enlarged side view and a plan view of a main part thereof. 1 …… One-wheel type rice transplanter, 4 …… Frame, 6 …… Float, 11 …… Chain case, 14 …… Wheel, 15 …… Lifting device, 22 …… Hydraulic cylinder, 23 …… Actuating device, 24 …… Control device, 36 ... Sensor rod, 37 ... Rotating shaft, 39 ... Valve drive arm, 39a ... Oval hole, 42 ... Coupling arm, 43 ...
… Rotating rod, 47 …… Valve connecting rod, 48 …… Valve drive spring, 50 …… Valve return spring, 52
...... Valve actuating rod, 54 ...... Valve arm, 57 ...... Hydraulic lever.

Claims (1)

[Claims] 1. A paddy wheel that is lifted and lowered by a hydraulic cylinder device that is operated by switching a switching valve of a hydraulic device, and a pair of left and right floats that are vertically movably mounted on a machine body and float up and slide on the surface soil surface of the paddy field. In a paddy field farming machine equipped with a steering handle provided at the rear of the machine body,
A valve switching member provided with a movable member that operates only when both the left and right floats move up or down at the same time, and the movable member is connected to the switching valve and is movable only within a certain range. And the left and right floats are connected via a buffering mechanism that absorbs the amount of movement when both floats have moved upward by more than a predetermined amount.