JP2520184B2 - Walk-type paddy work machine - Google Patents

Description

The present invention relates to a walking type paddy working machine such as a walking type rice transplanter or a walking type direct seeder.

[Conventional technology]

In a walk-behind rice transplanter, which is one of walk-behind paddy work machines, for example, as disclosed in JP-A-60-176511, traveling wheels are driven up and down to set the machine body above a set surface. Some are configured to keep.

In the above structure, the traveling wheels are configured to be vertically driven by the hydraulic cylinder, and a rotary type control valve is provided for operating the hydraulic cylinder. Then, as shown in FIG. 2 of the publication, a swing arm ((1 of the publication) is attached to an operation shaft ((11a) of the publication) of a spool of a control valve.
2)) is attached so that it can freely swing, and a linking rod ((15) in the above publication) is laid across the center float ((6) in the above publication) and the swing arm. Then, a pin ((13a) in the above publication) is provided on an operation portion ((13) in the above publication) fixed to the operation shaft of the control valve, and one end of the swing arm is abutted against this pin from above.

As a result, when the aircraft moves up and down with respect to the center float that follows the ground contact with the paddy field, the operating rod of the control valve is pivotally operated by the linkage rod and the swing arm to maintain the aircraft at the set height from the paddy field. The wheels are driven vertically.

[Problems to be Solved by the Invention]

In a walk-behind rice transplanter, the reaction force from the wheels tends to cause a backward descending posture when planting in a paddy field, so the center of gravity of the aircraft is set in front of the wheels to prevent this. Therefore, when the main clutch is disengaged and stopped while traveling on the road, the aircraft falls forward, the front part of the center float hits the ground, and the linkage rod (15) of the above publication is pushed up from below to operate the control valve. Then, the wheels move up and down.

In the above disclosed structure as means for preventing such a state, when the main clutch is disengaged (the wire (27) is pulled upward in FIG. 2 of the publication, and the clutch lever (28) is operated), Swing arm ((1
It is configured such that one end of 2)) is stopped at the neutral stop position by a stopper ((29) in the above publication).

Therefore, at the time of stopping as described above, in FIG. 2 of the publication, the left end of the swing arm on the paper surface is pushed upward by the linking rod while the right end of the rock arm on the paper surface is stopped by the stopper. As a result, when the swing arm is attached to the operation shaft of the control valve as in the above disclosed structure, the swing shaft causes the operation shaft of the control valve to bend.

Therefore, the spool of the control valve is distorted, which causes oil leakage in the control valve and deterioration of durability.

It is an object of the present invention to eliminate the above-mentioned problem that occurs when the vehicle body leans forward when the main clutch is disengaged.

[Means for solving the problem]

The feature of the present invention resides in that the above walking type paddy working machine is configured as follows. That is, a center float extending to the front of the machine body is attached to the lower part of the machine body so as to be vertically movable, and a linking rod is provided between one end of a swing arm that is swingable around a horizontal axis above the center float and the center float. And the rotary control valve for raising and lowering the traveling wheels is arranged with its operation axis parallel to the horizontal axis and at a position different from the horizontal axis. Then, the control valve is operated based on the vertical movement of the airframe with respect to the center float that follows the ground contact with the rice field, by linking the operation portion of the operation shaft and the other end of the swing arm.
The wheels are configured to be driven up and down so that the aircraft is maintained at the set height from the field, and the swing arm is operated at a position corresponding to the neutral stop position of the control valve in conjunction with the disengagement operation of the main clutch. A check member that is operated to switch between a state of receiving and preventing displacement in the wheel lowering direction and a state of interlocking with the operation of engaging the main clutch to allow the swing arm to swing over the operating range of the control valve. It is provided, and its action and effect are as follows.

[Work]

With the configuration described above, for example, when the aircraft moves up and down with respect to the center float (9) as shown in FIG. 1,
The swing rod (28) swings the swing arm (27) around the horizontal axis (P ₆ ), and the operating shaft (14a) of the control valve (14) swings via the operating portion (26). To be done.

Then, when the main clutch is disengaged, the check member (34)
Stops the swing arm (27) at the position corresponding to the neutral stop position (the state shown in FIG. 2). In this case, even if the machine body falls forward and the link rod (28) is pushed up above the plane of the paper, the force of this pushing up is the supporting point of the swing arm (27) (corresponding to the horizontal axis (P ₆ )) and the restraint. It will be hooked on the member (34) and will not be hooked on the operation shaft (14a) of the control valve (14).

〔The invention's effect〕

As described above, even if the airframe is tilted forward and the center float is pushed up, the force can be configured so that it does not act on the operation shaft of the control valve, resulting in oil leakage in the control valve and deterioration of durability. It can be prevented in advance.

〔Example〕

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

As shown in FIG. 5, a pair of transmission cases (2) are supported on the left and right sides of the traveling transmission case ( ₁ ) so as to be vertically swingable around the horizontal axis (P ₁ ). Wheels (3a) and (3b) for traveling are provided at the ends of 2) to support the machine body. At the rear of the fuselage, a seedling planting device including a planting arm (4) and a seedling rest (5), and a steering handle (6) are provided, and a transmission case (1) and a planting arm ( 4), a tank (7) and a feeding device (8) for feeding fertilizer in the tank (7) are provided.

A center float (9) is attached to a lower part of the machine body so as to be vertically swingable around a horizontal axis core (P ₂ ) at a rear part of the machine body and to be freely rolled around a front and rear axis center (P ₃ ). The center float (9) is fixed with a grooving device (10) for making a groove on the rice field, and the fertilizer fed from the feeding device (8) passes through the hose (11) and the grooving device (10). It is sent into the groove made by. As described above, the walking rice transplanter, which is an example of the walking paddy working machine, is configured.

As shown in FIG. 5, a forward descending frame (13) is fixed to the front of the mission case (1), and a gasoline engine (12) is mounted on the frame (13). Is supported in a forward descending posture.

Next, the vertical drive structure of the left and right wheels (3a) and (3b) will be described. As shown in FIGS. 4, 5 and 8, the rear end of the single-acting first hydraulic cylinder (18) is connected to the front end of the frame (13), and the first hydraulic cylinder (18) is located at the rear of the machine body. It is directed. The support arm (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 (around the vertical axis (P ₄ ) of the support arm (20) ( 21) is swingably attached. The balance arm (21) projects outward from the left and right long holes (13a) of the frame (13), and is connected to both ends of the balance arm (21) and the base arm (2a) of the transmission case (2). A pair of left and right rods (22) is erected and connected across. With the above structure, when the first hydraulic cylinder (18) is extended or contracted, the left and right transmission cases (2) and the wheels (3a) and (3b) are vertically rocked in the same direction.

As shown in FIGS. 4 and 8, the double-acting second hydraulic cylinder (24) extends over the support arm (20) and the bracket (23) fixed to the left rod (22). Are erected and connected. With this structure, for example, when the second hydraulic cylinder (24) is expanded and contracted, the left transmission case (2) and the wheel (3b) are driven to swing downward. Then, in conjunction with this operation, the balance arm (21) is oscillated counterclockwise in FIG. 4 via the rod (22),
The right operation case (2) and the wheel (3a) are swingably driven upward. That is, the right and left transmission cases (2) and the wheels (3a) and (3b) are operated by the expansion and contraction operation of the second hydraulic cylinder (24).
Can be driven upside down.

Further, as shown in FIGS. 4 and 8, a lock member (64) which is swingable is attached around the vertical axis (P ₉ ) of the lower balance arm (21). In the state shown in FIG. 8, the left and right wheels (3a), (3
This is a state in which the reciprocal vertical drive of b) can be performed. And
By swinging the lock member (64) with the wire (65),
By engaging the pin (20a) of the support arm (20) with the first recess (64a) of the lock member (64), the left and right wheels (3
It is possible to fix a) and (3b) in a posture parallel to the airframe. Also, the pin (20a) is connected to the second concave portion (6) of the lock member (64).
4b) or by engaging the third concave portion (64c), the left wheel (3b) can be fixed in a lowered state or the right wheel (3a) can be fixed in a lowered state.

In the above structure, as shown in FIGS. 4 and 5, the mission case (1) is located at the front of the machine body, and is displaced to the left of the plane of FIG. 3 from the left-right center (A) of the machine body. Are arranged. The second hydraulic cylinder (24) is arranged in parallel with the mission case (1) so as to be located on the side opposite to the mission case (1) with respect to the left-right center (A) of the airframe.

Next, the first and second control valves (14), (1) for supplying and discharging hydraulic oil to the first and second hydraulic cylinders (18), (24)
The linking structure between 5) and the center float (9) will be described. As shown in FIGS. 1, 3, and 4, the support bracket (16) is fixed to the front upper surface of the center float (9), and the operation arm (17) is fixed to the support bracket (16). The lower part of the front of the mission case (1) has a rod (19) that can only swing vertically around the horizontal axis (P ₅ ).
Is inserted over the long hole (16a) of the support bracket (16) and the first long hole (17a) of the operation arm (17).

Further, a rod (25) fixed to the front surface of the transmission case (1) is inserted into the first long hole (17a) of the operation arm (17). As a result, the center float (9) can be rolled by the amount of the gap between the horizontal width of the first elongated hole (17a) and the rod (25).

On the other hand, in the upper part of the mission case (1), the mission case (1) is on the left side of the paper (see FIG. 3).
The first and second control valves (14), (15) are provided on the side opposite to the side that is biased. First control valve (1
In 4), an operating shaft (14a) of a spool (not shown) projects in the lateral direction of the machine body, and an L-shaped operating portion (26) is fixed to the operating shaft (14a).

The swing arm (2) is swingable around the horizontal axis (P ₆ ) at a position different from the operation axis (14a) of the first control valve (14).
7) is attached and the center float (9)
Left and right center of the support bracket (16) and the swing arm (2
A connecting rod (28) bent in an L shape is erected and connected across one end of 7). In addition, the first control valve (1
The operating portion (26) of 4) is urged counterclockwise in FIG. 1 by the spring (29), and the pin (26a) of the operating portion (26) is attached to one end of the swing arm (27) at the lower side. I am working from

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 paddy field, the operating rod (28) and the swing arm (27) cause the operating portion (26) of the first control valve (14). Is operated, and the left and right wheels (3a) and (3b) are swingably driven up and down by the first hydraulic cylinder (18) so that the airframe maintains the set height above the rice field.

As will be described later, a main clutch (30) (see FIG. 6) is provided inside the mission case (1). The main clutch (30) has a clutch arm (31) for turning on and off, and FIG. Clutch lever (32) of the steering handle (6) shown in
DOO, as shown in FIG. 1 wire (33), the horizontal axis (P ₇₎
A restraining member (34) and a link (35) that can swing freely
Are interlockingly connected via.

When the clutch lever (32) is operated and fixed to the clutch disengaged position, the restraining member (34) is fixed at the position shown in FIG. 2 by the pulling action of the wire (33). When the main clutch (30) is disengaged in this manner, the machine body falls down, and the grounded center float (9) is pushed upward. In this case, the pin (27a) provided on the swing arm (27) is connected to the arm (34) of the restraint member (34).
a), contact the swing arm (27) and the first control valve (1
4) is stopped at the neutral stop position.

Further, the L-shaped operation arm (53) shown in FIG. 1 is linked to the operation lever (not shown) via the wire (66).
That is, by operating the operation lever, the first control valve (1) is operated by the operation arm (53) through the operation section (26).
4) The wheel (3a) and (3b) can be forcibly operated to descend.

As shown in FIGS. 1 and 3, a bell crank (39) is swingably attached around a horizontal axis (P ₈ ) on the front of the transmission case (1), and a pin ( 39a) is engaged with the second elongated hole (17b) of the operation arm (17). Then, the operating portion (15) of the second control valve (15)
a) and the bell crank (39) are interlockingly connected to each other via a linking rod (40).

With the above structure, when the aircraft leans to the left or right with respect to the center float (9) that follows the ground contact with the paddy field, the second control valve (via the operation arm (17), the bell crank (39) and the linking rod (40) ( The left and right wheels (3a), (3b) are oscillatingly driven by the second hydraulic cylinder (24) so that the vehicle body is operated in parallel with the left and right sides of the rice field by operating 15).

Next, the structure inside the mission case (1) will be described. As shown in FIGS. 6 and 7, the power from the gasoline engine (12) is transmitted to the input pulley (36) of the mission case (1) via a transmission belt (not shown), and the input gear ( 37). The input gear (37) is externally fitted to the first transmission shaft (38) so as to be relatively rotatable. A shift gear (41) slidably fitted to the first transmission shaft (38) in a spline structure is provided. Input gear (37)
The main clutch (30) is formed by engaging and disengaging the main clutch. The shift gear (41) is slid by the clutch arm (31) shown in FIGS. 1 and 3.

The side opposite to the side where the mission case (1) is displaced from the center (A) of the airframe (left side in FIG. 6).
, A first transmission shaft (38) and a second transmission shaft (42) protrude, and a first gear (43) and a second gear (43) are protruded from protruding ends of the first and second transmission shafts (38), (42). Gear (44) is attached.
Then, the power of the second transmission shaft (42) is transferred to the shift gear (45),
It is transmitted to the planting arm (4), the seedling rest (5), and the like via the third transmission shaft (46) and the fourth transmission shaft (47).

A shift gear (49) is slidably fitted to the fifth transmission shaft (48) in a spline structure. As a result, the shift gear (49) is engaged with the third gear (50) of the first transmission shaft (38) in the first forward speed state, and the shift gear (49) is engaged with the shift gear (41) to the second forward speed. In this state, power is applied to the side clutch (51), axle (52) and chain in the transmission case (2) (not shown).
And transmitted to the left and right wheels (3a) and (3b). Then, by engaging the shift gear (49) with the fourth gear (54) of the second transmission shaft (42), the power is transmitted to the wheels (3a) and (3b) in a reverse state.

In this case, the cover (56) is opened and the first and second gears (43) and (44) are exchanged.
As shown in the figure, the 1st and 2nd gears (43), (44) and cover (56) are at a high position from the rice field, and the mission case (1) is located from the center (A) of the fuselage to one side. Due to the deviation, the cover (56) and transmission case (2)
The first and second gears (43) and (44) can be easily exchanged because the distance between the first gear and the wheel (3b) is large.

As shown in FIGS. 9 and 10, a reinforcing frame (68) is laid across the transmission case (1) and the transmission case (67) of the planting arm (4), and this frame (68) is provided. A stay (69) for supporting the feeding device (8) is fixed to. On the other hand, the frame (70) is installed so as to extend over both the feeding devices (8), and the frame (70) is mounted on the stepped portion (69a) of the stay (69) while the stay (6
The feeding device (8) is bolted to both ends of 9).

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]

The drawings show an embodiment of the walking paddy working machine according to the present invention,
FIG. 1 is a side view showing the linkage structure of the first and second control valves and the center float, FIG. 2 is a side view of the vicinity of the swing arm when the main clutch is disengaged, and FIG. 3 is First
And a front view showing the connecting structure of the second control valve and the center float, FIG. 4 is a plan view of the mission case, the vicinity of the first and second hydraulic cylinders, and FIG. 5 is an overall side view of the walk-behind rice transplanter. FIG. 6 is a vertical cross-sectional rear view of the mission case, FIG. 7 is a schematic vertical side view of the mission case, FIG. 8 is a plan view of the vicinity of the support arm and the second hydraulic cylinder, and FIG. 9 is a supporting structure of the feeding device and the tank. The side view shown in FIG. 10 is a front view showing the support structure of the feeding device and the tank. (3a), (3b) …… Wheels, (9) …… Center float, (14) …… Control valve, (14a) …… Control valve operating axis,
(26) …… Operation part, (27) …… Swing arm, (28) ……
Linkage rod, (30) ... main clutch, (34) .... restrain member, (P ₆₎ ...... horizontal axis.

Claims (1)

(57) [Claims] 1. A mounting center float (9) over to the airframe front vertically movable in body bottom swingable swinging above the horizontal axis (P ₆₎ about the center float (9) A connecting rod (28) is installed over one end of the arm (27) and the center float (9), and a rotary type control valve (14) for raising and lowering the traveling wheels (3a), (3b). and parallel to the operating shaft (14a) is the horizontal axis (P _6), and, wherein the horizontal axis (P ₆₎ arranged in Sonru state positions different Tsu, the operating shaft (14a ) Operation part (2
6) and the other end of the swing arm (27) are linked to each other, and the control valve (14) is operated based on the vertical movement of the aircraft with respect to the center float (9) that follows the ground contact with the rice field, and the aircraft is moved from the rice field. The wheels (3a) and (3b) are configured to be driven up and down so as to be maintained at the set height, and the main clutch (3
In a state in which the swing arm (27) is received at a position corresponding to the neutral stop position of the control valve (14) in conjunction with the turning operation of (0) to prevent displacement in the wheel lowering direction, and the main clutch (30 ). Walk-type paddy field work provided with a restraining member (34) for switching the swing arm (27) so that the swing arm (27) can swing over the operating range of the control valve (14). Machine.