JPH0653009B2 - Walk-type paddy work machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a walk-behind paddy work machine, in which posture control of a vehicle body with respect to a mud surface is performed by vertically moving left and right wheels.

[Conventional technology]

In a walk-behind rice transplanter, which is an example of a walk-behind paddy work machine, a center float is movably supported in the lower center of the left and right sides of the machine, and the left and right wheels are moved up and down simultaneously based on the vertical movement of the center float with respect to the machine. It is operated vertically to control the elevation of the seedling planting depth (height from the mud surface of the aircraft).

In recent years, in addition to this lifting control, it has been proposed to provide a rolling control function for correcting the left and right inclinations of the body to keep the body parallel to the mud surface.

In this case, the center float described above is supported around the longitudinal axis of the machine body so that it can be freely rolled, and based on the rolling operation of the center float with respect to the machine body, the height difference between the left and right wheels relative to the machine body is changed to operate the machine body. It is considered to perform rolling control for keeping the temperature parallel to the mud surface.

[Problems to be solved by the invention]

In a walk-behind rice transplanter, once the planting process along one side of the field is completed and the aircraft reaches the ridge, the aircraft is lifted at this ridge to make a turn, and the next planting process Go in.

In this case, if the center float is rotatably supported by the machine body as described above, the center float may perform a rolling operation due to swaying of the machine body or the like at the time of turning around the ridge while lifting the machine body.

In this way, when the center float rolls when turning at the edge of the ridge, rolling control is activated in conjunction with this and the difference in height between the left and right wheels is changed, making it difficult to perform turning. There is.

It is an object of the present invention to prevent unnecessary rolling control during a turning operation by lifting a machine body.

[Means for solving problems]

A feature of the present invention is a walking type paddy work machine having a function of raising and lowering control based on a vertical movement of a center float and a function of rolling control based on a rolling operation around a front and rear axis of the center float. To do.

In other words, as the center float descends to the specified position in conjunction with the lifting operation of the aircraft from the mud surface, the contact part that prevents the center float from rolling to the right and the rolling of the center float to the left. The contact portions that block the movement are arranged on the right and left sides of the front and rear axis of the center float.

[Action]

According to the configuration of the present invention, if the center float descends to a predetermined position due to its own weight by lifting the aircraft, even if the center float attempts to roll to the right around the longitudinal axis, a part of the center float is The center float is abutted against the contact portion, so that the center float is prevented from rolling to the right.

On the contrary, even if the center float tries to roll leftward around the longitudinal axis at the above-mentioned predetermined position, a part of the center float comes into contact with the other contact portion and the center float rolls leftward. Is blocked.

〔The invention's effect〕

As described above, when lifting the aircraft from the mud surface,
The center float's rolling motion can now be automatically disabled, and unnecessary rolling control of the left and right wheels will not be performed during turning operations with the aircraft lifted, and maneuverability of the aircraft during turning will be eliminated. Was able to improve.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 4, a transmission case (1) having wheels (2) for traveling at the ends is swingably mounted around the horizontal axis (P ₁ ) to support the machine body, It is equipped with an engine (3) in the section, a planting claw (4) and a seedling stand (5) in the rear of the machine, and a steering handle (6). A walk-behind rice transplanter is constructed by providing a center float (7) for detecting inclination.

Next, the vertical movement structure of the wheel (2) will be described. As shown in FIGS. 4 and 3, the balance arm (10) is swingable around the longitudinal axis of the tip of the piston rod (9a) of the double-acting lifting cylinder (9) fixed to the machine body. And the operating arm (1a) erected on both ends of the balance arm (10) and the boss of the transmission case (1) are supported by the rod (11) and the rolling cylinder (1).
It is connected via 2).

As a result, the left and right wheels (2) are simultaneously moved up and down by the expansion and contraction operation of the lifting cylinder (9). The balance arm (10) is oscillated by the tip of the piston rod (9a) by expanding and contracting the rolling cylinder (12), and the difference in height between the left and right wheels (2) with respect to the body is changed. Of.

Next, the center float (7) will be described. As shown in Fig.1 and Fig.4, the rear part of the center float (7) can swing up and down around the horizontal axis (P ₂ ) in the left and right direction of the machine and around the front and rear axis (P ₃ ) of the machine. Freely rolling motion
It is attached to the aircraft. The front and rear axis (P ₃ ) of the guide member (8) that slides vertically on the guide member (13) fixed to the machine body
The front part of the center float (7) is mounted around it so that it can be rolled freely, and the guide member (8) and the operating part (14a) of the lift control valve (14) are interlockingly connected via a link rod (15). Has been done.

The lift control valve (14) is used to supply and discharge hydraulic oil to the lift cylinder (9) .When the aircraft sinks into the mud surface and the center float (7) rises due to buoyancy, lift control is performed. The valve (14) is operated to the supply side, and the left and right wheels (2) are operated to be lowered to correct the sinking of the airframe. On the other hand, the center float (7) where the aircraft floats above the mud surface
Is lowered, the lift control valve (14) is operated to the oil drain side, and the left and right wheels (2) are operated to be raised.

As shown in FIG. 1, a mounting bracket for mounting the guide member (8) on the center float (7) is extended upward to form an operation arm (16), and a bell crank (17) is formed through a slit. ) And the operating arm (16) are linked, and the end of the bell crank (17) is linked to the operating part (19a) of the rolling control valve (19) for the rolling cylinder (12) via the linking rod (18). Has been done.

As a result, when the airframe leans to the right with respect to the mud surface, the rolling control valve (19) is operated to the descending side of the right wheel (2) and the ascending side of the left wheel (2) due to the above linkage. Yes,
The opposite operation is performed when the aircraft leans to the left.

As shown in FIG. 1, rods (20) are connected to the left and right ends of the center float (7), and a pair of rods (20) are provided on the guide member (13) on the right and left sides of the front-rear axis (P ₃ ). Install the bracket (21) (corresponding to the contact part) and
The upper part of the rod (20) is slidably inserted into the opening (1).

In the normal operating position of the center float (7), as shown in Fig. 1, there is a sufficient distance between the bracket (21) and the end of the rod (20), which does not hinder the operation of the center float (7). Absent. Then, when the left and right wheels (2) are forcibly lowered to lift the aircraft from the mud surface, as shown in FIG. 2, the center float (7) is lowered and the upper end of the rod (20) is attached to the bracket ( 21), the center float (7) is suspended by the left and right rods (20), and the front and rear axis (P ₃ )
The rolling action of the surrounding center float (7) is prevented.

Further, the connecting portion of the rod (20) to the center float (7) is configured so that the position can be changed by two sets of lock nuts (22), and as described above, the body is lifted and the center float (7) is lifted. Fine adjustment of the posture can be performed when () is suspended.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

Drawing shows an embodiment of a walk-behind paddy work machine according to the present invention,
FIG. 1 is a front view showing the linkage between the center float and the lifting and rolling control valves, FIG. 2 is a front view showing a state in which the machine body is lifted from the mud surface, and FIG. 3 is a plan view showing the lifting structure of the left and right wheels. Drawing and Drawing 4 are the whole side views of a walk-behind rice transplanter. (2) …… Wheels, (7) …… Center float, (21) …… Contact part, (P ₃ ) …… Front and rear axis core.

Claims (1)

[Claims] 1. A vertically movable and forward / backward axis core (P ₃ ) of the machine body.
A center float (7) that can be freely rolled around is provided in the lower center of the left and right sides of the airframe, and the left and right wheels (2) are simultaneously moved up and down based on the vertical movement of the center float (7) to move the mud surface of the airframe. The height difference between the left and right wheels (2) with respect to the aircraft is changed based on the lifting control means that keeps the height from the vehicle to a constant height and the rolling operation of the center float (7). A walking paddy work machine equipped with rolling control means for keeping the center parallel (7) in parallel with the lowering of the center float (7) interlocked with the lifting operation of the aircraft from the mud surface to a predetermined position. ), The contact portion (21) that blocks the rolling motion to the right, and the contact portion (21) that blocks the rolling motion to the left of the center float (7), the center float (21). the longitudinal axis 7) (right P ₃₎ The walk-paddy working machine is arranged to fine left.