JP2525191B2 - Horizontal attitude control device for paddy field vehicle - Google Patents

Description

TECHNICAL FIELD The present invention relates to a horizontal posture control device for a paddy field vehicle such as a rice transplanter, a fertilizer applicator, and a seeder.

[Problems to be Solved by the Related Art and Invention] Conventionally, as a horizontal control device provided in this type of paddy field vehicle, an intermediate portion swings toward the machine body as shown in, for example, JP-A-62-118814. Both sides of the swing arm freely supported are connected to the left and right sensing floats via the sensing rod, respectively, while the spool of the aircraft horizontal control valve is connected to the swing arm, which is contrary to the sensing float. There is a structure in which the spool is pushed and pulled by swinging a swinging arm that is linked to vertical swinging to switch valves, thereby performing horizontal and horizontal posture control of the machine body.

However, in the neutral position, the pivot support shaft is arranged above the swing arm, and the connecting portion with the spool is arranged below the swing arm. When the swinging arm swings around the shaft, the lower connecting part will inevitably push and pull the spool with a large lateral displacement, resulting in a large lateral force. This may cause a problem that the smooth push-pull operation of the spool may be hindered and the horizontal control of the machine may not be performed accurately.

[Means for Solving Problems] The present invention was conceived with the object of providing a horizontal attitude control device for a paddy field work vehicle capable of eliminating these problems in view of the above-mentioned circumstances. hand,
A swing arm pivotally supported on the body side is connected to a sensing member for horizontally sensing the fuselage and a spool of a fuselage horizontal control valve, so that the swing arm swings when sensing the sensing member. When the valve is switched by pushing and pulling the spool to control the horizontal attitude of the machine, the pivot shaft of the swing arm and the spool connecting portion of the swing arm are spooled in a neutral state. It is arranged on the swing arm so as to be positioned on a straight line orthogonal to the push-pull operation direction.

Further, according to the present invention, a large lateral force is prevented from being applied when the spool is pushed and pulled by swinging by the swinging arm.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings.
In the drawings, reference numeral 1 denotes a traveling machine body of a walk-behind rice transplanter, which is an example of a paddy field vehicle, and a machine body frame 2 of the traveling machine body 1.
The engine 3 is installed in the front part of the
The provision of members such as the planting claw 5 and the driving handle 6 is the same as conventional ones. Further, 7 is a traveling wheel, 8 is a chain case, and 9 is a bonnet, which is the same as before.

A center float (main float) 10 is mounted below the machine body frame 2, and sensing floats (corresponding to the sensing members of the present invention) 11 are arranged on both front left and right sides of the center float 10. ing. The shape of this sensing float 11 is such that the inner edge has a center float 10
The shape is substantially the same as the shape of the outer part that bulges in the left-right direction, and the bottom surface has a constricted shape so that the muddy water flows into the gap between the sensing float 11 and the center float 10. A bracket on the front of this sensing float 11.
12 is attached integrally, but the bracket 12 is
Engine base integrally fixed to the body frame 2 side
The front end of a support frame 13 extending from the 3a side is pivotally supported by a support shaft 12a so as to be swingable in the vertical direction, whereby the sensing float 11 has a rear portion which is in a low position and follows the unevenness of the tiller. It swings up and down. The support frame
A support shaft 14 is further rotatably supported around the shaft center via a bracket 13a in the middle portion of 13, and the outer end of the support shaft 14 is extended to the upper surface portion of the sensing float 11. And
The upward movement of the sensing float 11 is restricted within a range until the sensing float 11 contacts the support shaft 14. Further, the lower end of the guide plate 15 is pivotally supported by a pin 15a on a rib 11a formed on the upper surface of the rear part of the sensing float 11 (rearward from the support shaft 14 portion). Hole 15
The support shaft 14 is slidably fitted to b, and is configured to serve as a guide when the sensing float 11 swings up and down.

Also, a link is attached to the front bracket 12 of the sensing float 11.
The upper end of 16 is integrally fixed, while a link 17 is further pivotally supported on the support shaft 14 so as to be vertically swingable. A connecting link 18 is interposed between one arm 17a of the link 17 and the lower end of the link 16. Further, the lower end of the sensing rod 19 is swingably connected to the other arm 17b of the link 17. When the sensing float 11 swings up and down around the axis of the support shaft 12a following the unevenness of the cultivator, the sensing rod 19 is linked by the link 16, link 18 and link 17 linked to this swing. It is designed to detect up and down. Incidentally, 20 is a bumper integrally provided on the engine base 2a.

On the other hand, reference numeral 21 is a lift control cylinder whose cylinder cylinder 21a side is integrally attached to the body frame 2 side through an appropriate fixing member such as a bracket 2c. The lift control cylinder 21 has a cylinder rod 21b rearward. It is designed to expand and contract toward the center of the balance arm 22 at its tip.
It is mounted so that it can swing horizontally via 22a. Both ends of the balance arm 22 are connected to the side of the chain case 8 via a connecting rod 23. The balance arm 22 operates when the lifting control cylinder 21 expands and contracts.
While being guided by the guide rod 24 integrally assembled to the side, the vertical movement of the traveling wheels 7 is performed at the same time by performing the forward and backward movement, thereby performing the vertical movement control of the machine body.

Further, a holder 25 slidably attached to the guide rod 24 is provided with a backward-acting horizontal control cylinder 26 in which both ends of a cylinder rod 26a are fixed. The tip of the arm 25a protruding from the holder 25 is oscillated at the base end of the arm 22b integrated with the balance arm 22 side through a pin 22c at a position substantially concentric with the support shaft 22a of the balance arm 22. While being rotatably supported, a pin 26c projecting from a cylinder tube 26b of a horizontal control cylinder 26 is engaged with a long hole 22d formed at the tip of an arm 22b. And as will be described later, the horizontal control valve 28
The horizontal control cylinder 26 performs a displacement operation in the left-right direction of the cylinder tube 26b by switching the
The reference numeral 22 horizontally swings about a support shaft 22a as a fulcrum, whereby the left and right traveling wheels 7 move upside down in a contradictory manner to horizontally control the machine body. 25b is a guide hole for the pin 26c formed in the holder 25.

Reference numeral 27 denotes a lift control valve integrally attached to the front part of the lift control cylinder 21, and the valve 27 is connected to the vertical movement detection following the change of the center surface of the center float 10 to switch the valve. It is configured to expand and contract the lifting control cylinder 21, and the horizontal control valve 28 is connected to the side of the lifting control valve 27 (left side in the embodiment) with the connecting plate 29 and the bolt. It is integrally assembled through an appropriate connecting member such as 29a. Further, a bracket 30 is integrally fixed to a bolt 30a on the upper surface of the lift control valve 27, and a support shaft 31 integrally fixed to the bracket 30 is provided with a support shaft 32.

On the other hand, 33 is a plate-like swing arm having a substantially U-shape in a plan view, and a central portion of the swing arm 33 is integrally provided with a substantially inverted L-shaped auxiliary plate 33a toward the rear. ing. In the swing arm 33, the support shaft 32 swings the tip of the auxiliary plate 33a and the swing arm 33 in a state where the bent tip end of the auxiliary plate 33a is slidably applied to the support plate 31. It is supported so as to be swingable up and down around the support shaft 32 by penetrating therethrough. Both ends of this swing arm 33
An actuating shaft 34 is pierced by 33b so as to be rotatable around the axial center while the movement in the axial direction is restricted by the E pin 34a. Further, the bracket 30 has a mounting piece 30b bent rearwardly.
A mounting hole 30c for assembling the fuel tank 35 is formed in 0b.

One end portion of the swing arm 33 extends long toward the horizontal control valve 28 side assembled to the side of the lifting control valve 27 as described above, and the extension pin 33c is connected to the connecting pin 33d. The spool 28a of the horizontal control valve 28 is fixed via the. Then, as will be described later, the swing arm 33 swings up and down with the support shaft 32 as a fulcrum to push and pull the spool 28a, thereby switching the horizontal control valve 28. . And, this is a neutral state, that is, when the sensing float 11 is in the same height posture on both the left and right, the swing arm 33 that is oriented in the horizontal direction in the front view,
The support shaft 32 and the connecting pin 33d of the spool 28a are the third
The arrangement is such that the spool 28a is positioned on a straight line L orthogonal to the pushing / pulling operation direction indicated by the arrow A, and has substantially the same height position, whereby the pivot shaft 32 and the spool connecting pin 33d are It is disposed on the swing arm 33 so as to be positioned on a straight line orthogonal to the pushing and pulling operation direction of the spool 28a in the neutral state.

Further, the swinging of the swinging arm 33 is performed by the following structure. That is, the base ends of the link plates 34a are integrally fixed to the left and right ends of the actuating shaft 34 described above, and one end of the link plate 34a is provided with a pin of a substantially L-shaped adjuster plate 36. It is pivotally connected via 36a. Further, the other end of the adjuster plate 36 is provided with an upper end portion in which the screw groove 19a of the sensing rod 19 is engraved so as to be loosely fitted through the nut 19b so that the rod length can be adjusted. When the left and right sensing floats 11 oscillate oscillatingly due to changes in the unevenness of the cultivator, the oscillating arms are moved by the reverse movement of the sensing rods 19 interlocked with the oscillating arms.
33 swings up and down with the support shaft 32 as a fulcrum, whereby the push-pull operation of the spool 28a is performed, the horizontal control valve 28 is switched and controlled, and the traveling wheel 7 on the sensing float 11 side that has moved upward. The horizontal control cylinder 26 operates so as to swing the balance arm 22 on the side of the downward movement. By the way, when the sensing float 11 swings up and down at the same time, the actuating shaft 34 is absorbed by being rotated about the axis of the swing arm 33.

The pipe 37 from the horizontal control valve 28 to the horizontal control cylinder 26 extends from the outer surface of the horizontal control valve 28, traverses the lifting control cylinder 21, and crosses the cylinder tube 26 from the opposite side.
The return pipe 39 from the horizontal control valve 28 to the transmission case 38 side is arranged in a substantially S-shape reaching b, and the return pipe 39 is located on the engine air cleaner 40 side arranged in front of the lift control valve 27. Pipes are provided along the outside of the frame so as to bypass the frame, and thereby the return oil is cooled.

In the embodiment of the present invention configured as described above, as described above, the push-pull operation of the spool 28a in the horizontal control valve 28 causes the left-right sensing float 11 to swing up and down by the unevenness of the tiller. In this case, the swinging arm 33 is vertically swung about the support shaft 32 as a fulcrum in connection with this, and in this case, the swinging arm 33 is
The support shaft 32 and the connecting pin 33d with the spool 28a are
In the neutral posture, they have substantially the same height, which are arranged on a straight line orthogonal to the push-pull operation direction of the spool 28a. As a result, when the left and right sensing float 11 swings backwards, the swinging arm 33 swings around the support shaft 32 and pushes and pulls the spool 28a. It is possible to avoid a large lateral force acting on the push-pull operation of the spool 28a, which is not included, and a smooth and light spool operation is achieved, and the horizontal attitude of the aircraft with high accuracy is high. Stable control is achieved.

Moreover, the swing arm support shaft 32 and the spool connecting pin 33d
However, since it is arranged directly on the swing arm 33 itself rather than on a member such as a bracket protruding from the swing arm 33, the structure can be simplified and the size can be reduced. .

The adjustment of the horizontal attitude control is performed by adjusting the length of the sensing rod 19, which is performed by adjusting the upper end of the sensing rod 19 protruding from the adjuster plate 36 with the nut 19b. Therefore, it is difficult to adjust because it is disturbed by other members of the aircraft like the one that is done by adjusting the turn bag provided in the middle of the conventional rod, and it is easy to get muddy water and rusts or mud clogging the screw groove. It is possible to prevent such troubles and easily and surely perform the adjustment work.

Furthermore, regarding Sensing Float 11, its movement restriction is
Since the link 17 to which the lower end portion of the sensing rod 19 is connected is formed by the pivot 14 that is pivotally supported, the upward movement regulation is reliable, and the upward movement regulation is conventionally provided on a stopper provided separately. As if the link was touched, the link floats beyond the fulcrum when the sensing float 11 moves upwards, and the link may not return. It is possible to avoid such problems. Moreover, since the link can be moved over the fulcrum, the swing amount of the sensing float 11 can be made large, and the rolling performance of the aircraft can be improved.

Moreover, the swing of the sensing float 11 causes the sensing float 11 to move.
Is connected to the swing arm 33 via the sensing rod 19 at the rear position actually contacting the rice field, the swing of the sensing float 11 swings at a right angle as it is, though the parallel link mechanism is interposed. Since it acts on the moving arm 33, as a result, there is no positional deviation as in the case where the front end of the sensing float 11 and the swing arm 33 are connected in an inclined shape, and highly accurate sensing is possible. Is something that can be done.

[Advantages] In summary, since the present invention is configured as described above, the swinging arm swings due to the sensing operation of the sensing member, and the valve switching is performed by the push-pull operation of the spool connected thereto. However, while performing the horizontal attitude control of the machine body, the pivot shaft of the swing arm and the spool connecting portion are located on a straight line orthogonal to the pushing and pulling direction of the spool in the neutral attitude state. As a result, when the spool is pushed and pulled by the swing of the swing arm, a smooth and light push and pull operation is performed without a large lateral force acting as in the conventional case. It is possible to control the horizontal attitude of the aircraft with high stability in a stable manner.

Moreover, the swing arm pivot shaft and the spool connecting portion are
Since it is arranged directly on the swing arm itself, not on a member such as a bracket protruding from the swing arm,
The structure can be simplified and the size can be reduced.

[Brief description of drawings]

The drawings show an embodiment of a horizontal posture control device for a paddy field vehicle according to the present invention, wherein FIG. 1 is a side view of a walk-behind rice transplanter, FIG. 2 is a plan view of the same, and FIG. The front view of the horizontal control mechanism, FIG. 4 is the side view of the sensing float, and FIG.
The figure shows a side view of the frame without the sensing float.
7 is a plan view of the same, FIG. 7 is a perspective view of a valve for horizontal control, FIG. 8 is a plan view of a control cylinder, FIG. 9 is a side view of the same, and FIG. 10 is a front view of the same. In the figure, 1 is a traveling body, 11 is a sensing float, 19 is a sensing rod, 28 is a horizontal control valve, 28a is a spool, 32 is a spindle, 33 is a swing arm, and 33d is a connecting pin.

Claims (1)

(57) [Claims] Claim: What is claimed is: 1. A swing arm pivotally supported on the body side,
The body is connected to a sensing member for horizontally sensing the body and a spool of the body horizontal control valve, and the swing arm swings in response to the sensing of the sensing member to perform push / pull operation of the spool for valve switching. In the horizontal posture control, the pivotal shaft of the swinging arm and the spool connecting portion of the swinging arm are positioned in a neutral state on a straight line orthogonal to the pushing and pulling operation direction of the spool. A horizontal posture control device for a paddy field vehicle, which is arranged on a swing arm.