JPH05137428A - Walking type working device in paddy field - Google Patents

Abstract

PURPOSE:To reduce pushing of mud during rotation near a levee by making width of a center float at the front edge narrow and enlarging the width of the rear part. CONSTITUTION:A front half part 9a of a center float 9 has narrower width than an interval between wheels 3a and 3b and a rear half part 9b is protruded in the lateral direction of the wheels. When a machine body is inclined left or right against the center float, the left and the right wheels are controlled to rise and fall in the opposite directions mutually by a rolling regulating means. When the machine body is vertically moved against the center float, the left and right wheels are raised or dropped in the same direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a center float in a walking type paddy working machine such as a walking type rice transplanter or a direct seeding machine.

[0002]

2. Description of the Related Art In a walk-behind rice transplanter, which is an example of a walk-behind paddy working machine, left and right wheels for traveling (see FIG. 1 of the above publication, as disclosed in Japanese Patent Laid-Open No. 64-10909). 2), a center float (7 in FIG. 1 of the above publication) is arranged, and this center float is connected to the rear part of the machine body so as to be vertically swingable and rollable. Then, based on the vertical swing of the center float, the lifting and lowering control means for lifting and lowering the left and right wheels in the same direction so that the aircraft is maintained at the set height from the rice field, and the aircraft is tilted based on the lateral inclination of the aircraft with respect to the center float. Rolling control means for vertically moving the left and right wheels in opposite directions so as to be parallel to the rice field is provided.

When performing the rolling control as described above, the lateral inclination of the aircraft with respect to the center float is detected as the lateral inclination of the aircraft with respect to the rice field. Therefore, in order to perform the rolling control accurately, the center float is applied to the rice field. On the other hand, it must be always grounded in parallel to the left and right.
Therefore, in the above-described conventional structure, auxiliary floats (19 in FIG. 1 of the above publication) are provided on the left and right of the front part of the center float to widen the ground contact width of the center float so that the center float is always parallel to the rice field in the left-right direction. It is grounded.

[0004]

In a walk-behind rice transplanter, when one planting process is completed, it turns 180 degrees at the ridge and starts the next planting process. In this case, the rear part of the fuselage (planting device side) is lifted by the steering handle, and the front part of the center float is pressed against the rice field to make a turn at the ridge. Therefore, if the auxiliary floats are provided on the left and right of the front end of the center float as described above, the lateral width of the front end of the center float is wide, so that the front surface of the center float when turning on the ridge It pushes the mud of the land and damages the rice field near the ridge. As a result, when planting seedlings on the edge of the ridge at the end, the rice paddy on the edge of the ridge must be thoroughly leveled, which is troublesome. It is an object of the present invention to reduce a situation in which a rice paddy working machine does not deteriorate the function of rolling control and to roughen a rice field at the time of turning at a ridge.

[0005]

A feature of the present invention is that the above walking type paddy working machine is configured as follows. In other words, it has a width that is narrower than the distance between the pair of left and right wheels for traveling, and is located between the left and right wheels, and the front end extends to near the front end of the aircraft, and the rear end of this front half. The center float is integrally formed with the rear half of the wheel that extends laterally outward to the rear side of the wheel, and the rear part of the machine body is swingable and can be rolled freely. Based on the swing, the aircraft is maintained at the set height from the rice field,
Elevation control means for raising and lowering the left and right wheels in the same direction, and rolling control means for raising and lowering the left and right wheels in mutually opposite directions so that the aircraft is parallel to the rice field based on the lateral inclination of the aircraft with respect to the center float. I have it.

[0006]

When configured as described above, the front half portion 9a of the center float 9 has the left and right wheels 3 as shown in FIG.
Since the width of the front half 9a is narrower than the distance between a and 3b, the front of the front half 9a is narrower than the front of the conventional center float. As a result, even if the front part of the center float 9 is pressed against the rice field and turns at the ridge, it is less likely that the front part of the center float 9 pushes mud on the rice field.

On the other hand, the rear half 9b of the center float 9 extends laterally outward from the rear end of the front half 9a to the rear side of the wheels 3a, 3b. As a result, the left and right width of the rear part of the center float 9 is increased,
Due to the action of the wide rear part, the center float 9 always comes in contact with the paddy field in parallel with the left and right sides. Therefore, when the airframe leans to the left or right with respect to the center float 9, the rolling control means operates accurately to return the airframe to a state parallel to the rice field. And this center float 9
On the other hand, when the machine body moves up and down, the lifting control means operates in the conventional manner and the machine body is maintained at the set height from the rice field.

Further, since the rear half 9b of the center float 9 extends to the rear side of the wheels 3a and 3b, the wheel 3
It can be expected that the passing traces of a and 3b are leveled by the left and right rear half portions 9b. Further, since the center float 9 is integrally formed from the first half 9a to the second half 9b, there is not much inflow of mud on the rice field to the rear side of the range extending to the left and right halfs 9b of the center float 9. Therefore, if the planting position of seedlings and the direct seeding position of seeds are set on the rear side of the above-mentioned range, the seedlings will not be tilted or seeds will be washed away by the inflow of mud.

[0009]

As described above, by narrowing the width of the front end of the center float and widening the width of the rear part of the center float, it is possible to reduce mud pushing at the time of turning at the ridge. As a result, it is possible to save the labor for leveling when planting the seedlings on the edge of the ridge, which makes the work easier. In this case, since the lateral width is secured at the rear part of the center float, the rolling control function does not deteriorate. Further, since the function of preventing the inflow of mud by the center float can be enhanced, the work precision of planting seedlings and direct seeding is improved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 7 and 1, a pair of transmission cases 2 are provided on the left and right sides of the traveling mission case 1 and the horizontal axis P1.
The transmission case 2 is supported so as to be swingable up and down, and traveling wheels 3a and 3b are provided at the ends of the transmission case 2 to support the machine body. The rear part of the machine is equipped with a seedling planting device composed of a planting arm 4 and a seedling stand 5, etc., and a steering handle 6, and a center float 9 is provided in the left and right center of the lower part of the machine to provide walk type paddy field work. One of the machines is a two-wheeled two-row type walk-type rice transplanter.

Next, an elevating structure for the left and right wheels 3a and 3b will be described. As shown in FIGS. 1 and 7, the rear end of the single-acting first hydraulic cylinder 18 is connected to the front end of the frame 13 for supporting the engine 12, and the first hydraulic cylinder 18 is directed rearward of the machine body. There is. A bracket 20 is fixed to the tip of the piston rod 18a of the first hydraulic cylinder 18, and a pair of upper and lower balance arms 21 is swingably attached around the vertical axis P4 of the bracket 20.

The balance arm 21 projects outward from the left and right long holes 13a of the frame 13, and extends between the left and right ends of the balance arm 21 and the left and right operation arms 2a fixed to the base of the transmission case 2. , A pair of left and right linkage rods 2
2 are erected and connected. With the above structure, when the first hydraulic cylinder 18 is expanded / contracted, the left and right transmission cases 2 and the wheels 3a, 3b are moved up and down in the same direction.

As shown in FIG. 1, a bracket 23 is fixed to the left connecting rod 22.
A double-acting second hydraulic cylinder 24 is erected and connected between the second hydraulic cylinder 24 and the bracket 20 on the side of the first hydraulic cylinder 18. With this structure, for example, when the second hydraulic cylinder 24 is extended, the left transmission case 2 and the wheel 3a are rocked downward. Then, in conjunction with this operation, the linkage rod 2
The balance arm 21 is oscillated counterclockwise in FIG. 1 via 2, and the right transmission case 2 and the wheel 3b are oscillated upward. That is, when the second hydraulic cylinder 24 is expanded / contracted, the left and right transmission cases 2 and the wheels 3a, 3b.
Are moved up and down in opposite directions.

Next, the structure of the center float 9 will be described. As shown in FIGS. 1 and 7, the center float 9 is integrally formed by a front half portion 9a and a pair of left and right rear half portions 9b connected to the left and right rear ends of the front half portion 9a.
The front half 9a of the center float 9 has left and right wheels 3a, 3
It has a lateral width narrower than the distance between b and the transmission case 2 and is arranged between the left and right transmission cases 2, and the front half portion 9a.
The front end of the is extended to near the front end of the aircraft. Figure 1,
As shown in FIGS. 2 and 3, a vertically long concave portion 9 is formed on the lower surface of the front half portion 9a.
c is provided to improve the straightness of the airframe.

The rear half portion 9b of the center float 9 extends laterally outward from the rear end of the front half portion 9a to the rear side of the wheels 3a, 3b, and the rear end of the front half portion 9a and the left and right rear half portions 9a.
The planting arm 4 is surrounded by b. As shown in FIGS. 1 and 3, on the lower surfaces of the left and right rear half portions 9b, a frontwardly-spreading, vertically elongated concave portion 9d is provided. As a result, the passing traces of the left and right wheels 3a and 3b can be traced to the left and right rear half 9
It is pressed from above with b, and the passage marks of the wheels 3a and 3b are filled with the recess 9d of the rear half 9b. The left and right rear half portions 9b prevent the mud on the rice field G from flowing into the planting position side from the left and right wheels 3a, 3b.

Next, the support structure of the center float 9 will be described. As shown in FIGS. 1 and 7, a support frame 15 is fixedly installed over the left and right rear half portions 9b of the center float 9. On the other hand, the operation lever 7 is attached to the support frame 14 for the steering handle 6 at the rear part of the machine body so as to be vertically swingable and positionally fixable, and the connecting tool 8 is provided around the horizontal axis P2 of the operation lever 7 in the machine body left-right direction. The support frame 1 of the center float 9 is swingably connected, and is swingable around the horizontal axis P3 of the connecting tool 8 in the machine longitudinal direction.
The central parts of 5 are connected.

On the other hand, in the front part of the machine body, as shown in FIG. 2, the first pin 10 in the front-rear direction of the machine body is fixed to the upper part of the front surface of the mission case 1, and the lower part of the front face of the mission case 1 in the left-right direction of the machine body. A second pin 11 that swings up and down around the horizontal axis and does not swing left and right is provided. The operation plate 16 is fixed to the front upper surface of the center float 9, and the first and second pins 10 and 11 are inserted into the elongated holes 16a of the operation plate.

With the above structure, the first pin 10 and the long hole 1
The center float 9 swings up and down around the horizontal axis P2 by the vertical sliding action of 6a and the vertical swinging action of the second pin 11. Then, the center float 9 rolls around the horizontal axis P3 and the second pin 11 within the range of the difference between the left and right widths of the first pin 10 and the long hole 16a.

Next, an elevating control means for elevating the left and right wheels 3a and 3b in the same direction so that the machine body is maintained at a set height from the field G will be described. As shown in FIG.
A first control valve 28 for the first hydraulic cylinder 18 is arranged on the upper part of the transmission case 1, and the center float 9
The center of the front part of the control valve 28 and the operating portion 28a of the first control valve 28 are linked via the linking rod 17 and the swing arm 19.

With the above structure, when the body moves up and down with respect to the center float 9 that follows the ground contact with the rice field G, the first control valve 28 is operated via the linkage rod 17 and the like. As a result, the hydraulic oil from the first control valve 28 is supplied to and discharged from the first hydraulic cylinder 18 so that the machine body is maintained at a set height above the rice field G, that is, the seedling planting depth is set to a set value. The left and right wheels 3a and 3b are moved up and down in the same direction so as to be maintained at. Then, the operating lever 7 is operated to change the position of the connecting tool 8 up and down, and the horizontal axis P2 of the center float 9 is set.
By changing the position of P3 with respect to the aircraft,
Change the above-mentioned set height (planting depth of seedlings).

Next, a rolling control means for vertically moving the left and right wheels 3a and 3b so that the machine body is parallel to the rice field G will be described. As shown in FIG. 2, a second hydraulic cylinder 24 is provided on the upper part of the mission case 1.
And a second control valve 29 for
The operation portion 29 a of the center float 9 and the operation plate 16 of the center float 9 are linked via a swingable bell crank 25 and a link link 26.

With the above structure, when the body tilts to the left or right with respect to the center float 9 which follows the ground contact with the rice field G, the second control valve 29 is operated via the bell crank 25 and the like.
As a result, hydraulic oil is supplied to and discharged from the second hydraulic cylinder 24 from the second control valve 29, and the left and right wheels 3a and 3b are operated to move up and down in mutually opposite directions so that the machine body becomes parallel to the field G. To be done.

Next, the vertical feeding structure of the seedlings on the seedling stand 5 will be described. As shown in FIGS. 4 and 6, a pair of upward and downward feed pawls 27a is provided, and a transport chain 27 including a large number of the feed pawls 27a of the pair is provided, and a lower drive gear 30 and an upper driven gear 30 are provided. The transport chain 27 is wound around the gear 31. As shown in FIG. 5, three sets of transport chains 27 are arranged on one seedling placing surface of the seedling placing base 5, and the driven gears 3 are provided from the lower end of the seedling placing base 5.
The length up to 1 is set to the length of one seedling. As a result, the drive gear 30 allows the three sets of transport chains 27 to be conveyed.
Is rotated to send seedlings to the planting arm 4 side.

[Other Embodiment] As shown in FIG. 8, the operation lever 7 for supporting the center float 9 is attached to the center float 9.
The center float 9 may be extended to the rear end (near the position of the planting arm 4) of the front half portion 9a of the above and the center float 9 may be connected to the front end of the operation lever 7 via the connecting tool 8. In addition, as shown in FIG. 9, a transport chain 27 is provided on one seedling placing surface of the seedling placing table 5.
2 sets, and between the two sets of the transport chains 27, a vertically long rib 32 lower than the feed claw 27a of the transport chain 27 is provided.
May be provided.

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 configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a plan view showing a center float, a support structure for the center float, and a lifting structure for left and right wheels.

FIG. 2 is a front view showing the front part of the center float and the front part of the mission case.

FIG. 3 is a vertical cross-sectional rear view of the rear half of the center float.

FIG. 4 is a vertical cross-sectional side view showing the structure near the transport chain of the seedling stand.

FIG. 5 is a cross-sectional plan view showing the structure near the transport chain of the seedling stand.

FIG. 6 is a partial perspective view of a carrier chain of a seedling stand.

[Figure 7] Overall side view of the walk-behind rice transplanter

FIG. 8 is a side view showing another embodiment of the support structure for the center float.

FIG. 9 is a cross-sectional plan view showing another structure near the transport chain of the seedling stand.

[Explanation of symbols]

 3a, 3b Wheels 9 Center float 9a Center float front half 9b Center float latter half G Gata

Claims (1)

[Claims] 1. A pair of left and right traveling wheels (3a), (3)
It has a width narrower than that of b), and the left and right wheels (3
The front half (9a), which is arranged between a) and (3b) and has the front end extended to the vicinity of the front end of the airframe, and the front half (9a).
A center float (9) is integrally formed with a rear half portion (9b) laterally extending outward from the rear end to the rear side of the wheels (3a) and (3b), and is vertically swingable at the rear portion of the machine body. And the center float (9) that can be rolled freely
By connecting the rear parts, the left and right wheels (3a), (3b) are moved in the same direction so that the aircraft is maintained at a set height from the field (G) based on the vertical swing of the center float (9). And the left and right wheels (3a) so that the aircraft becomes parallel to the rice field (G) based on the elevation control means for vertically moving the aircraft to the center float (9).
A walk-type paddy work machine comprising: rolling control means for vertically moving (3b) in opposite directions.