JPH0687690B2 - Walk-type paddy work machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention attaches a pair of left and right propulsion wheels to a traveling machine body to which a working device is attached so as to be able to move up and down, and at the center front portion of the traveling machine body from the propulsion wheels. The center float is arranged in the front, and the left and right side floats are arranged behind the propulsion wheels, and the relative heights of the left and right propulsion wheels are changed based on the rolling operation due to the ground pressure fluctuations of the center float and the left and right side floats. In addition to providing rolling control means for maintaining a constant ground rolling posture of the vehicle, the left and right propulsion wheels are simultaneously moved up and down in the same direction based on the vertical movement of the center float and the side float due to the ground contact pressure fluctuations to raise the ground height of the traveling body. The present invention relates to a walk-behind paddy work machine provided with a lifting control means for maintaining a constant level.

[Conventional technology]

In this type of walk-behind paddy work machine, conventionally, one of the floats is used as a rolling sensor, and the other float is used as a lift sensor, so that the rolling operation and the lift operation are independently performed. (For example, the actual development 61
-5709).

[Problems to be solved by the invention]

However, since the center float is located in front of the propulsion wheels at the front left and right center of the vehicle, the side floats are located laterally and laterally behind the propulsion wheels. On the other hand, since it is only locally grounded, it may cause unnecessary rolling operation and lifting operation due to local unevenness, and on the contrary, the seedling planting posture may be disturbed.

The present invention is to provide a float group in which the conventional drawbacks can be solved by simply modifying the float group.

[Means for solving problems]

The characteristic configuration according to the present invention mechanically integrates the center float arranged in front of the propulsion wheels at the front left and right center of the traveling machine body and the left and right side floats arranged behind the propulsion wheels,
The center control and the side float are configured to perform the rolling control and the elevation control based on the integrated rolling operation and the elevation operation, and the operation and effect thereof are as follows.

[Action]

In other words, by arranging the side floats on both sides of the center float in the left-right direction of the traveling machine body, the ground contact state is secured over the entire area in the left-right direction, and the center float and the rear part are provided in front of the propulsion wheels. By arranging the side floats in the front and rear direction of the traveling machine body, the grounding state can be secured, and by integrating the float groups arranged over a wide area of the planting surface as described above, the local area of the cultivator Even if the propulsion wheels move up and down due to the unevenness, the ground contact force is exerted on the entire float group to suppress the posture change of the traveling machine body, and due to the local unevenness of the planting surface, either the center float or the side float Even if one tries to roll or move up and down, the other exerts a tread force to suppress the operation of the entire float.

When the cultivator has an inclination or unevenness over a certain range (corresponding to the entire area with planting), the rolling operation and the lifting operation are performed as a unit of the float group, so accurate rolling control and lifting is performed for the traveling machine body. Control can be performed. In addition, the side floats arranged at regular intervals in the left-right direction, compared to the case where only the center float is arranged, can have a configuration in which the rolling sensing power is enhanced.

〔The invention's effect〕

Therefore, the float can be operated reliably only when the depth of the cultivator changes drastically, and resistance to disturbance caused by local unevenness is increased to ensure stable rolling.
It came to be able to perform lifting control. Moreover, the modification required for that purpose may be only to integrate the center float and the side float, which are originally arranged at the above-mentioned positions.

〔Example〕

A walk-behind rice transplanter as an example of a paddy working machine will be described. In the walk-behind rice transplanter, the engine (1) and the mission case (2) are arranged in the front part of the fuselage, and the transmission case (3) which also serves as the fuselage frame is extended from the rear end of the mission case (2). A seedling planting device (7) as a working device equipped with a planting case (4), a seedling planting mechanism (5), and a seedling stand (6) is attached to the outgoing end, and both sides of the mission case (2). A wheel case (9) pivotally supporting a propelling wheel (8) on its surface is pivotally supported so as to be vertically swingable, and a center float (10) is provided at the center of the lower part of the machine body and side floats (11) are provided on both sides behind the center float (10). ), (11) are arranged. In addition, a fertilizer application (32) equipped with a storage hopper (28), a feeding mechanism (29), a downflow pipe (30), and a grooving device (31) is installed side by side in the center of the machine, and planting work and fertilization work are performed. A paddy working machine that can simultaneously perform is constructed.

Next, rolling control means (A) and lifting control means (B)
Will be described. As shown in FIG. 1, auxiliary floats (12), (12) are arranged at regular intervals on both sides of the front part of the center float (10), and the auxiliary floats (12), ( 12) are integrally connected to the center float (10) by connecting frames (13) and (13), and both (10) and (1
It is configured so that 2) and (12) are operated together. This center float (10) has a rear end of a first connecting rod (14) extending rearward from the rear end of the center float (10) as a rear bracket (a rear fulcrum attached to a transmission case (3)). The bracket (15) is configured to be vertically swingable around the horizontal axis (Q) of the bracket (15) and to be rollable around the longitudinal axis (P) of the machine body.

On the other hand, with respect to the side floats (11), (11), second connecting rods (26), (26) are erected from their front ends, and their free ends are attached to the first connecting rod (14). The side floats (11), (11) are integrated with the center float (10).

Therefore, the center float (10) and the left and right side floats (11) and (11) are integrally moved up and down around the horizontal axis (Q), and are integrated around the machine longitudinal axis (P). Rolling operation.

On the other hand, as shown in FIGS. 1 and 2, a swing arm (16) is erected at the pivotal base end of the wheel case (9) to the mission case (2) and the wheel lifting cylinder (17) is provided. ) Piston rod (17A) tip to the balance arm (1
8) is pivotally supported, and the swing arm (16) and the balance arm (1
8) is linked with link rods (19A) and (19B), and the left and right wheels (8),
(8) is operated in the same direction by the same lifting amount. Then, an operating rod (2) that contacts the upper surface of the center float (10) and moves up and down according to the vertical swing of the center float (10).
0) is provided, and the upper end of the operating rod (20) is connected to the operation arm of the lifting control valve (21). Move the wheels (8), (8) up and down in the direction
An elevation control means (B) is provided which keeps the height of the work device (7) above ground constant and maintains the planting depth constant.

Swing arm (16) corresponding to the left link rod (19A)
A rolling cylinder (22) that connects the two (19A) and (16) is interposed between the rolling cylinder (2) and the rolling cylinder (2).
The balance arm (18) is horizontally oscillated in the forward and reverse directions by the expansion and contraction operation of (2) so that the left and right wheels (8) and (8) are moved up and down in a contradictory manner. On the other hand, as shown in FIG. 3, the front bracket (23) is pivotally supported at the front end of the center float (10), and the front bracket (23) and the operating arm (25) of the rolling control valve (24) are connected to each other. Are interlockingly connected via a bell crank (33) and a connecting rod (34), so that the valve (24) is switched and controlled by rolling around the fuselage front-rear axis (P), and the left and right wheels (8) , (8) are rocked rearward to maintain a constant rolling posture of the working device (7) to the ground, thereby forming a rolling control means (A) for keeping the left and right planting depths constant.

[Other Embodiments] The above embodiments can be applied to a walk-behind rice transplanter without a fertilizer application device (32), a dedicated fertilizer applicator, or the like.

As a means for changing the relative heights of the left and right traveling wheels (8), (8), the left and right wheels may be independently lifted and lowered.

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,
1 is an overall side view, FIG. 2 is an overall plan view, and FIG. 3 is a front view showing rolling control means. (7) …… Working device, (8) …… Propulsion wheel, (10) ……
Center float, (11) …… Side float, (A)…
… Rolling control means, (B) …… elevation control means.

Claims (1)

[Claims] 1. A pair of left and right propulsion wheels (8), (8) are attached to a traveling machine body to which a work device (7) is attached so as to be able to move up and down, and the propulsion wheels (8) are provided at the front center of the left and right sides of the traveling machine body. The center float (10) is arranged further forward, and the left and right side floats (11), (11) are arranged rearward of the propulsion wheels (8) so that these floats (10), (11), (11) groups are mechanically arranged. The center float (10) and the side floats (11), (11) change their relative heights of the left and right propulsion wheels (8), (8) based on the integrated rolling operation due to the ground pressure fluctuations of the side floats (11), (11) A rolling control means (A) for maintaining a constant rolling posture of the aircraft to the ground is provided, and
The center float (10) and the side float (11),
Elevating control means (B) for simultaneously raising and lowering the left and right propulsion wheels (8) and (8) in the same direction based on the integrated raising and lowering operation due to the ground pressure fluctuation of (11) to keep the ground height of the traveling machine body constant.
Walk-type paddy work machine equipped with.