JPH07102019B2 - Chain case structure of walking type paddy working machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a chain case structure of a walk-type paddy working machine such as a rice transplanter, a seeder, and a fertilizer applicator.

[Problems to be Solved by Prior Art and Invention] Generally, in this type of walk-type paddy working machine, the machine body is moved up and down with respect to a field scene by vertically moving the traveling wheels traveling on the tiller relative to the machine body. Maintain a substantially constant work posture,
The work depth is made uniform. And in this thing, the chain case structure on which the traveling wheels are mounted is a first chain case whose base end portion is pivotally supported on the body side,
For example, Japanese Patent Publication No. 52-23928 discloses a bending type structure constituted by a second chain case in which a base end portion is pivotally supported at a tip end portion of the first chain case.

However, in this case, the actuating arm that performs the displacement operation of the bending type chien case has a bending arm system in which the actuation center is located above the base end of the first chien case and bends in the middle part. The structure of is not allowed to be complicated, and the total length of the operating arm becomes long, which is a problem because it is against the reduction of the body weight.

[Means for Solving the Problem] The present invention was conceived with the object of providing a chain case structure for a walk-behind paddy working machine capable of eliminating these drawbacks in view of the above-mentioned circumstances. In a walkable paddy work machine in which the aircraft body is maintained in a substantially constant working posture with respect to the paddy field by vertical displacement of the traveling wheels, the chain case structure of the traveling wheels has a base end portion on the aircraft body side. And a second chain case in which a base end portion is pivotally supported on the tip side of the first chain case and traveling wheels are pivotally attached to the tip side of the first chain case. The second chain case is attached to one end of an operating arm that swings around a shaft provided on the machine body side so as to be located between the pivot shaft of the first chain case and the axle of the traveling wheel. Interlockingly connected, with an operating rod at the other end of the operating arm. It is characterized in that it is configured to perform a non-arcuate vertical movement displacement of the traveling wheel by the co-oscillating operation of the first and second chain cases associated with the operation of the balance arm which is interlocked and coupled. It is a thing.

Further, according to the present invention, with this configuration, the operating arm has a simple structure and can be made short and light.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, 1 is a walk-behind rice transplanter, and the rice transplanter 1
Is equipped with an engine 2 in the front, and a front low rear height seedling placing table 3 is provided in the rear of the seedling placing table 3 by a planting operation of a planting claw 4 which is timed to run the aircraft. It is the same as in the past that the seedlings with unit planting are scraped and planted on the rice field.

Reference numeral 5 denotes a traveling wheel, and the traveling wheel 5 has an axle 5a at a rear end portion of a second chain case 6 which constitutes a bending type chain case.
The front end of the second chain case 6 is pivotally supported by the tip of the first chain case 7 so as to be swingable (flexible). The first chain case 7 has a support shaft 7a on the upper portion of the transmission case 8.
It is pivotally supported about the fulcrum. The traveling wheel 5 is adapted to be rotated by the driving force from the engine being transmitted through the transmission case 8, the first chain case 7 and the second chain case 6 as power.

Reference numeral 9 denotes a machine body frame (transmission case) in which a front end portion is integrally attached to a rear end portion of the transmission case 8, and the machine body frame 9 includes a chain case 10 from the transmission case 8 to the rear of the machine body. A power transmission chain 11 for power transmission is installed on the side, and a support shaft 12 penetrating in the left and right lateral directions so as to pass between the upper and lower chains of the body frame 9 is rotatably supported. The support shaft 12 is arranged such that its position is located between the axle 5a and the support shaft 7a of the first chain case 7, but the one end (the left end in the embodiment) is actuated. The intermediate boss portion 13a of the arm 13 is swingably supported around the axis, and the base end portion of the lock plate 14 is integrally fixed. On the other hand, at the other end of the support shaft 12 (right end in the embodiment), the intermediate boss 15 of the operating arm 15 is provided.
a is spline-fitted to be integrally attached.

Further, the lock plate 14 is elastically mounted so that the lock pin 14a always protrudes by the ammunition machine 14b and fits into the locking hole 13d formed on the operating arm 13 side.
Is integrated with the lock plate 14. That is, the operating arm 13 is supported by the lock pin 14 to support the spindle 12, and further the operating arm 15 on the other side.
With this structure, the left and right actuating arms 13 and 15 are configured to simultaneously swing about the support shaft 12 when the lock is actuated. Further, the lock pin 14a is retracted against the ammunition 14b by an operation linked to, for example, the operation of entering the planting clutch lever, and is pulled out from the locking hole 13d, whereby the operating arm 13 becomes free from the lock plate 14, and Thus, the left and right actuating arms 13 and 15 are configured to be independently swingable around the support shaft 12. Moreover, the front end portions of the operating arms 13 and 15 are pivotally attached to the intermediate portion of the second chain case 6 so as to be swingable.
Has been done.

On the other hand, 16 is a hydraulic cylinder for controlling the lifting and lowering of the machine body, which is obliquely installed above the machine body frame 9 in a front-rear and rear-lower shape. A valve case 17 that houses a switching valve is integrally provided at the base end of the hydraulic cylinder 16, and the valve case 17 is further attached to a bracket 18 integrally fixed to the machine body frame 9 with a tightening bolt 18a. It is fixed integrally by. Further, the front end portion of the hydraulic cylinder 16 is integrally fixed to a mounting seat 8a integrally projecting from the transmission case 8 by a tightening bolt 8b, which allows the transmission case 8 and the machine body to be fixed. The frame 9 and the hydraulic cylinder 16 form a triangular reinforcing frame structure. Further, in the embodiment, the mounting bracket 19a of the fuel tank 19 is integrally mounted with the front end of the hydraulic cylinder 16, but the cylinder rod 16a is provided in the space between the fuel tank 19 and the transmission case 8. Expands and contracts, and thus secures a large space behind the engine 2 and in front of the transmission case 8 without being hindered by the hydraulic cylinder 16, for example, for inspection and maintenance of the air cleaner 2a. In addition to improving maintainability, it is possible to secure a wide space behind the hydraulic cylinder 16 and also to secure a space for installing other members, for example, a member such as a fertilizer drive unit when mounting after fertilizer application. In, it has become possible to contribute to shortening the body length.

At the tip of the cylinder rod 16a, the center of a balance arm 21 is pivotally supported by a pin 21a so that a bullet 20 is interposed. The front end of the operating rod 22 is connected to both left and right ends of the balance arm 21, and the rear end of the operating rod 22 is pinned to the rear ends of the operating arms 13 and 15 described above.
It is pivotably supported by 13c and 15c. An upper end of a sensing rod 24 having a lower end connected to the float 23 is connected to a switching plate 17b integrally attached to a valve shaft 17a protruding from the valve case 17. Then, the cultivator changes in depth with the traveling of the aircraft, and the switching plate 17b oscillates in association with the vertical swing of the float 23 caused by the vertical swing of the float 23 caused by the change in the ground contact pressure from the paddy field. As a result, the valve is switched and the hydraulic cylinder 16 is expanded and contracted. The expansion and contraction control of the hydraulic cylinder 16 acts in the direction in which the tiller becomes deeper and the machine body sinks, and when the ground contact pressure of the float 23 increases, the hydraulic cylinder 16 expands, whereby the left and right operating rods 22 are moved. Are simultaneously pushed forward, the operating arm 1
3 and 15 swing around the support shaft 12 as a fulcrum so that the pivotally connected portions 13b and 15b with the second chain case 6 are displaced downward, and accordingly, the first chain case 7 and the second chain case. Due to the bending displacement operation in cooperation with the case 6, the traveling wheels 5 are moved downward in a substantially vertical state, and the traveling wheels 5 are moved downward by the depth of the tiller. The traveling control of the traveling wheels 5 is performed.
Then, the planting work is performed within the range of vertical movement of the traveling wheels 5, but in the case of traveling of the body, the traveling wheels 5 are further lowered and the body 1 is lifted. However, in this case, the traveling wheels 5 are displaced rearward to bring the vehicle body into the front balance state.

In the embodiment, the vertical displacement position of the traveling wheel 5 is adjusted by adjusting holes 13e and 15e provided in the working arms 13 and 15 to correspond to Fukada and Asada. ,
In this case, since the adjustment holes 13e and 15e are arranged not on the operation rod 22 side but on the operation arms 13 and 15 side and in an arc shape with respect to the axis of the operation arm, the displacement locus of the traveling wheel is not formed. It is designed so that it can always be operated in a fixed locus range without changing easily.

In the embodiment of the present invention configured as described above, the planting seedlings placed on the seedling placing table 3 are scraped off and planted on the rice field by the planting operation of the planting claws 4 accompanying the traveling of the aircraft. However, in this case, the valve switches in accordance with the swinging operation due to the ground contact pressure change of the float 23 accompanying the depth change of the tiller,
This causes the hydraulic cylinder 16 to expand and contract. The swing movements of the operating arms 13 and 15 linked to the expansion and contraction of the hydraulic cylinder 16 cause bending swing displacement in which both chain cases 6 and 7 move together, and the traveling wheels 5 move linearly in the planting work range. It is possible to maintain the working posture of the machine body with respect to the paddy field substantially constant with respect to the depth change of the cultivator by performing the vertical movement.

On the other hand, when the aircraft is traveling, the traveling wheels 5 are moved downward beyond the planting work range to lift the aircraft from the paddy field. In this case, however, the traveling wheels 5 also move backward, Is in the front balance state, and the traveling property of the airframe can be improved. In such an embodiment, the chain case in which the traveling wheels 5 are mounted is the first and second chain cases 6 that cooperate with each other. Although it has a bent chain case structure constituted by 7, the support shafts 12 of the operating arms 13 and 15 for moving the traveling wheels 5 up and down are the axles 5a of the traveling wheels.
And the support shaft 7a of the first chain case 7 are arranged. Therefore, the actuating arms 13 and 15 do not have to have a complicated structure that is long in the front-back direction and bent in the middle unlike the conventional ones, and the length is short and the structure can be configured compactly. Although it is a bending type chain case structure, the structure can be simplified and the weight can be reduced.

Moreover, in this case, in this embodiment, the vertical movement displacement locus of the axle 5a is larger than the movement of the operation arms 13 and 15 as a result of the connecting portion between the operation arms 13 and 15 and the operation rod 22 being on the front side of the axle 5a. Therefore, a large displacement of the traveling wheel 5 can be achieved by a small change of the operating arms 13 and 15, and the structure can be further simplified.

Moreover, the one in the present embodiment has a locking pin during the planting work.
Since 14 is immersed, the left and right actuating arms 13 and 15 have a structure in which they can independently swing around the support shaft 12 as a fulcrum. Even if the depths of the cultivator are different from each other, the posture of the machine can be maintained substantially constant with respect to the rice field, and high working accuracy can be secured.

When the aircraft is traveling, the left and right actuating arms 13 and 15 are integrated by making the lock pin 14 project, but this rocking mechanism operates the actuating arm 13 that displaces the second chain case 6. Even if the provisional second chain case 6 is configured to be swingable with respect to the first chain case 7 because it is locked directly, it can be locked without any problem. Therefore, the bending chain case structure can be moved left and right. Even if the rolling mechanism for swinging the wheels 5 in the up and down directions is provided, the operation can be performed without any trouble. Moreover, in the embodiment, if the second chain case 6 is locked, the first chain case 7 is also automatically locked.
It is not necessary to separately consider the locking mechanism of the first chain case 7.

Further, the operation of the bending type chain case structure for vertically moving the traveling wheels 5 does not directly operate the first chain case 7, but only the left and right second chain cases 6 have one operating arm 13, 15 respectively. Since it is constructed by being actuated by means of the actuating mechanism, the actuating arms 13 and 15 need only be provided on the left and right sides, respectively, even though the actuating arms are of the bending type chain case structure, and the structure can be simplified.

[Effects] In summary, since the present invention is configured as described above, the bending type chain case structure including the first and second chain cases is used, and the vertical movement locus of the traveling wheel is set to
Due to the co-oscillating operation of the second chain case, it is possible to select a desired locus that does not depend on a simple circular arc like the one chain case rocking, but the displacement operation of this bending type chain case is possible. The operating arm to be controlled swings around a support shaft arranged between the support shaft of the first chain case and the axles of the traveling wheels, and accordingly, it is long and bent in the front-rear direction as in the conventional case. There is no need, and the structure can be made simple and short and light, which contributes to not only the simplification of the structure of the airframe but also the weight reduction of the airframe.

[Brief description of drawings]

The drawings show an embodiment of a chain case structure for a walk-behind paddy work machine according to the present invention, wherein FIG. 1 is an overall side view of a walk-behind rice transplanter, and FIG. FIG. 3 is a plan view of the same as above, FIG. 4 is an enlarged side view of an essential part, FIG. 5 is a plan view of the same as above, FIG. 6 is a longitudinal sectional view of a machine frame, and FIG. In the figure, 1 is a traveling body, 5 is a traveling wheel, 5a is an axle, 6 is a second chain case, 7 is a first chain case, 7a is a support shaft, 12
Is a spindle, and 13 and 15 are working arms.

Claims (1)

[Claims] 1. A walk-type paddy working machine in which the machine body is maintained in a substantially constant work posture with respect to a rice field by vertical displacement of the machine wheels, and a chain case structure of the machine wheels is provided on the machine body side. A first chain case in which the base end is pivotally supported,
The first chain has a base end portion pivotally supported on the front end side and a second chain case on which the traveling wheels are pivotally mounted on the front end side, and the second chain case is a first chain. It is linked to one end of an operating arm that swings around a support shaft provided on the machine body so as to be located between the pivot shaft of the case and the axle of the traveling wheel, and operates at the other end of the operating arm. It is characterized in that it is configured to perform non-arcuate vertical movement displacement of the traveling wheel by the co-oscillating operation of the first and second chain cases associated with the operation of the balance arm interlockingly connected via the rod. It is a chain case structure of walking type paddy work machine.