JP2637637B2 - Walking paddy working machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a walking type paddy working machine such as a walking type rice transplanter and a walking type direct sowing machine. Related to the support structure.

[0002]

2. Description of the Related Art Some walk-behind rice transplanters, which are examples of walk-behind paddy field working machines, include a center float support structure as disclosed in Japanese Utility Model Laid-Open Publication No. 60-125,813. In this structure, a center float (6 in FIG. 1 of the above-mentioned publication) is vertically swingably connected around a rear fulcrum (29 in FIG. 1 of the above-mentioned publication), and a front portion of the center float is in front of the center float by a guide member. The part is connected to the fuselage so that it does not swing left and right or roll left and right. In other words, the center float has a support structure that can swing up and down around its rear fulcrum, but cannot roll left and right.

[0003] With this structure, even if the left and right wheels are actually grounded and the cultivator that travels is uneven, and the aircraft leans left and right, the center float does not swing left and right with respect to the aircraft, so the center with respect to the rice field surface Due to the buoyancy of the float, the aircraft is maintained parallel to the rice field.

[0004]

As described above, the inclination of the body to the left and right with respect to the rice field is corrected by the stepping of the center float because the normal planting process in which the body and the center float are substantially parallel in the longitudinal direction of the body. It is time (corresponding to the first state), and a state in which substantially the entire lower surface of the center float is in contact with the rice field.

[0005] On the other hand, when the planting process is completed and the aircraft reaches the ridge, the worker located on the rear side of the aircraft lifts the rear of the aircraft by holding the steering handle at the rear of the aircraft and lifts the ridge. Turn the aircraft with. The reason for raising the rear part of the fuselage is to prevent the planting arm or the like at the rear part of the fuselage from scratching the rice field when turning. When the rear part of the body is lifted in this way, the rear part of the center float rises and only the front part of the center float comes into contact with the rice field. As described above, when the ground contact area of the center float becomes extremely small, the buoyancy also becomes small, so that the center float is not stepped on, and the machine body is tilted left and right due to the unevenness of the plow. Since the cultivator at the ridge is generally rougher than the cultivator at the center of the paddy field in many cases, the airframe is more likely to tilt left and right when turning at the ridge.

[0006] In the conventional structure, the center float does not roll with respect to the body, and in such a case, the center float is inclined to the left and right integrally with the body. Therefore, when turning around the ridge, the aircraft and the center float repeatedly move while tilting to the left and right, and especially the right or left part in front of the center float alternately on the rice field regardless of the unevenness of the rice field. It is in a state where it proceeds while going deeply. As a result, the right or left portion of the front part of the center float is strongly pushed by the mud, and the rice field at the ridge becomes rough, so that it is difficult to perform the planting work at the ridge which is performed thereafter. SUMMARY OF THE INVENTION It is an object of the present invention to provide a walking type paddy working machine in which a rear surface of a body is lifted and a turning operation is performed so that a rice field surface is prevented from being roughened at a front portion of a center float.

[0007]

The feature of the present invention resides in the following configuration of the walking paddy working machine as described above. In other words, [1] a vertically long center float is connected to the lower left and right center of the lower part of the fuselage so as to freely swing up and down around the rear fulcrum and to be able to roll left and right, and the center float and the fuselage are substantially parallel in the longitudinal direction of the fuselage. In the first parallel state, the left and right rolling of the center float is restricted, and the front of the center float and the front of the aircraft are close to each other.
A regulating mechanism is provided to allow left and right rolling of the center float in the state.

[2] A vertically long center float is connected to the left and right center of the lower part of the fuselage so as to be able to swing up and down around the rear fulcrum and to be freely rollable to the left and right, so that the left and right traveling wheels are opposite to each other. An actuator that drives up and down,
Rolling control means for operating an actuator so that the aircraft becomes parallel to the rice field on the left and right sides based on the horizontal inclination of the aircraft with respect to the center float that follows the ground on the rice field, and the center float and the aircraft in the longitudinal direction of the aircraft Regulates the left and right rolling of the center float in a first state substantially parallel to each other, and allows the left and right rolling of the center float in a second state in which the front part of the center float and the front part of the body approach each other. It is provided.

[0009]

[I] With the construction described in [1] above, in a normal work traveling state near the center of a paddy field, for example, as shown in FIG. (The first state), and substantially the entire lower surface of the center float 9 is in contact with the rice field surface G. In this state, the center float 9 cannot be rolled left and right with respect to the airframe due to the action of the regulating mechanism, or even if the center float 9 can be rolled, its range is narrow. That is, the center float 9 rolls left and right substantially integrally with the machine body.
Accordingly, even when the left and right wheels 3a and 3b travel on the tillage having irregularities and the body and the center float 9 are inclined left and right, the center float 9 is stepped on by the buoyancy acting on the center float 9, so that the body also has The left and right sides of the rice field G are maintained in parallel.

[0010] When the aircraft reaches the ridge from the above-mentioned work traveling state, the operator temporarily stops the work and lifts the rear part of the aircraft from the rice field surface G by holding the steering handle 6. When such an operation is performed, the front of the body lowers, so that the front of the body and the front of the center float 9 approach each other (corresponding to the second state). As a result, the operation of the above-described regulating mechanism is eliminated, and the center float 9 can freely roll with respect to the body. Therefore, when turning around on the ridge in this state, the center float 9 freely rolls and tries to follow the ground surface G regardless of the inclination even if the body is tilted left and right. Accordingly, the front part of the center float 9 does not partially enter the rice field G and pushes the mud, and the mud on the rice field G is not
Is easily pulled out from the right or left lower surface of the front part to the opposite side.

[II] If the rolling control means is provided as configured in the preceding paragraph [2], the center float and the aircraft are substantially parallel in the longitudinal direction of the aircraft (corresponding to the first state).
In the work traveling state, the center float cannot be rolled left and right with respect to the machine body due to the action of the regulating mechanism, or even if the center float can be rolled, the range is narrow. That is, the center float rolls left and right substantially integrally with the body. In this way, if the center float can only slightly roll with respect to the aircraft, even if the aircraft tilts left and right with respect to the center float that follows the ground on the rice field, the left and right wheels are slowly moved in the opposite direction by the rolling control means. Is driven only up and down. Therefore, in the work traveling state, the body is maintained in a state parallel to the rice field surface by the vertical driving of the left and right wheels in the opposite direction by the rolling control means and the depression of the center float by the buoyancy acting on the center float.

When the aircraft reaches the ridge from the work traveling state, the operator temporarily stops the work and lifts the rear part of the aircraft from the rice field by holding the steering wheel. When such an operation is performed, the front of the body lowers, so that the front of the body and the front of the center float approach each other (corresponding to the second state). As a result, the operation of the regulating mechanism disappears in the same manner as described above, and the center float can be rolled over a larger range than in the above-described work traveling state. In other words, the rolling control means operates sensitively to quickly drive the left and right wheels up and down in opposite directions. Therefore, when turning around on the ridge in this state, the center float attempts to freely roll and follow the ground on the rice field surface as described above even if the body is tilted left and right. As a result, the front part of the center float does not partially penetrate deep into the rice field and pushes the mud, and the mud on the rice field escapes from the right or left lower surface of the front part of the center float to the opposite side. It becomes easier. Then, when the body is tilted left and right with respect to the center float that follows the ground on the rice field, the left and right wheels are quickly driven up and down in opposite directions by the rolling control means,
The fuselage is kept parallel to the rice field.

[0013]

According to the first aspect of the present invention, the center float can be freely rolled and adapted to the rice field when turning on the ridge where the rear part of the fuselage is lifted, thereby suppressing mud pushing by the center float. Was completed. As a result, it is possible to suppress the roughening of the rice field near the ridge and to save the labor for leveling near the ridge, and it is easier to perform the work (planting work, direct sowing work, etc.) on the ridge which is performed later. Also, in the normal work traveling state near the center of the paddy field, since the aircraft is maintained in a state parallel to the rice field surface by stepping on the buoyancy of the center float, the function of the conventional structure is left as it is. .

According to the second aspect of the present invention, the center float can be freely rolled and adapted to the rice field when turning on the ridge when the rear part of the aircraft is lifted, so that mud pushing by the center float can be suppressed. Was. As a result, it is possible to suppress the roughening of the rice field near the ridge and to save the labor for leveling near the ridge, and it is easier to perform the work (planting work, direct sowing work, etc.) on the ridge which is performed later. And
At the time of turning on the ridge, the rolling control means operates and the aircraft is maintained parallel to the rice field surface, so that the turning operation by the steering wheel can be easily performed. Also, in a normal work traveling state near the center of the paddy field, the aircraft is maintained in a state parallel to the rice field surface by stepping up by the buoyancy of the center float and slowly moving up and down the wheels by the rolling control means. Therefore, the function of the conventional structure is substantially left as it is.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 4 and 3, a pair of transmission cases 2 are provided on the left and right sides of a traveling transmission case 1 with a horizontal axis P1.
The transmission case 2 is supported so as to be freely swingable up and down, and wheels 3a and 3b for traveling are provided at an end of the transmission case 2 to support the machine body. At the rear of the fuselage, a seedling planting device composed of a planting arm 4 and a seedling cradle 5 and the like, and a steering handle 6 are provided, and a vertically long center float 9 is provided at the lower left and right center of the fuselage. A two-wheel two-row walking rice transplanter, which is one of the paddy field working machines, is configured.

The walking rice transplanter shown in FIGS. 4 and 3 is equipped with a lifting control means for driving the left and right wheels 3a and 3b up and down in the same direction, and frees the left and right wheels 3a and 3b in opposite directions. It is equipped with a mechanism that can move up and down,
Next, the vertical movement structure of the left and right wheels 3a and 3b will be described. As shown in FIGS. 4 and 3, a rear end of a single-acting type first hydraulic cylinder 18 is connected to a front end in the frame 13 for supporting the engine 12, and the first hydraulic cylinder 18 is directed rearward of the machine body. ing. And the first hydraulic cylinder 1
A bracket 20 is fixed to the end of the piston rod 18a of the No. 8 and a pair of upper and lower balance arms 21 is swingably mounted around a longitudinal axis P4 of the bracket 20.

The balance arm 21 projects outwardly from the left and right long holes 13a of the frame 13, and the balance arm 2
1 and a pair of left and right linking rods 22 extending between the left and right ends of the transmission case 2 and the left and right operation arms 2 a fixed to the base of the transmission case 2.
Are erected and connected. With the above structure, when the first hydraulic cylinder 18 is extended and contracted, the left and right transmission cases 2 and the wheels 3a and 3b are driven to move up and down in the same direction, and the balance arm 21 swings around the longitudinal axis P4 of the bracket 20. By moving, the left and right transmission cases 2 and the wheels 3a, 3
b freely move up and down in opposite directions.

Next, the support structure of the center float 9 will be described. As shown in FIGS. 4 and 3, the center float 9 extends from the rear of the fuselage to the front of the fuselage at the center of the lower right and left sides of the fuselage. The center float 9 has a wide front portion and a narrow rear portion. Is formed. An operation lever 7 is attached to the support frame 14 for the steering handle 6 at the rear of the body so as to be able to swing up and down and fix the position freely. (Corresponding to a rear fulcrum) is swingably connected, and a rear portion of the center float 9 is swingably connected around a horizontal axis P3 of the connecting tool 8 in the longitudinal direction of the machine body.

On the other hand, as shown in FIGS. 1 and 2, at the front of the body, a first pin 10 facing forward and rearward of the body is fixed to the upper part of the front of the transmission case 1 and the body at the lower part of the front of the transmission case 1 is fixed. A second pin 11 that swings up and down around the horizontal axis P5 in the left and right direction and does not swing right and left is provided. A bracket 15 bent in a U-shape in side view is fixed to the upper surface of the front part of the center float 9, and a guide member 16 (corresponding to a regulating mechanism) is connected to the bracket 15. This guide member 16
A narrow first long hole 16a is formed in the upper part, and a wide second long hole 16b is formed in the lower part so as to extend vertically. The bracket 15 is also formed with a vertically long hole 15a. I have.

Then, the second pin 11 is inserted over the second long hole 16b of the guide member 16 and the long hole 15a of the bracket 15, and the first pin 10 is inserted into the first long hole 16a of the guide member 16. I have. In the above structure, the rear part of the center float 9 can swing up and down and left and right by the action of the connecting member 8, but at the front part of the center float 9, the outer diameters of the first and second pins 10, 11 Since the widths of the first and second long holes 16a and 16b and the long hole 15a are set to be substantially equal, the first and second pins 10 and
Due to the function of 11, the front part of the center float 9 is regulated so as not to swing right and left. Therefore, in the state shown in FIG. 4 (the first state in which the center float 9 and the body are substantially parallel in the longitudinal direction of the body), the center float 9
The whole is set so that it cannot roll left and right. However, the first and second slots 16 of the guide member 16
The center float 9 as a whole can be swung up and down around the horizontal axis P2 at the rear of the fuselage shown in FIG. 4 due to the flexibility of the a and 16b and the swinging operation of the second pin 11.

Next, a description will be given of a lift control means for driving the left and right wheels 3a and 3b up and down in the same direction so that the body is maintained at a set height from the rice field G. As shown in FIGS. 1 and 2, a first control valve 28 for the first hydraulic cylinder 18 is disposed above the transmission case 1, and the center of the base of the bracket 15 of the center float 9 and the first control valve 28
Of the linking rod 17 and the swing arm 1
9 are linked.

With the above structure, when the body moves up and down with respect to the center float 9 following the ground surface G, the first control valve 28 is operated via the link rod 17 and the like. As a result, the operating 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 the set height from the rice field G, that is, the planting depth of the seedling is set to the set value. , The left and right wheels 3a, 3b are driven up and down in the same direction.

In the normal planting and running state of this walking rice transplanter, the center float 9 and the machine are substantially parallel to each other in the longitudinal direction of the machine as shown in FIG. 4 (corresponding to the first state). Almost the entire lower surface of the center float 9 is grounded to the rice field surface G. In this state, when the airframe moves up and down with respect to the center float 9 as described above, the left and right wheels 3a and 3b are driven up and down in the same direction, and the airframe is maintained at a set height above the rice field surface G.

In this state, as shown in FIG.
Are located in the first elongated hole 16a of the guide member 16 and the second pin 11 is located in the second elongated hole 16b of the guide member 16, so that the action of the first and second pins 10, 11 as described above. Accordingly, the entire center float 9 cannot be rolled left and right with respect to the body. That is, the center float 9 rolls left and right integrally with the aircraft in a state in which the center float 9 is substantially parallel to the aircraft in the lateral direction of the aircraft (see the posture in FIG. 1).

With this arrangement, even if the left and right wheels 3a and 3b travel on uneven tilling and the body and the center float 9 are inclined left and right, the center float 9 is stepped on by the buoyancy acting on the center float 9. The aircraft is also maintained in a state parallel to the left and right surfaces G. Then, along with this, the balance arm 21 shown in FIG. 3 swings around the vertical axis P4, and the left and right wheels 3a, 3b move up and down in opposite directions to adapt to the unevenness of the plow. is there. in this case,
Instead of setting the center float 9 so that it cannot be rolled at all with respect to the body, the first slot 16a is set in the first slot 16a.
The center float 9 may be set to be slightly wider than the pin 10 so that the center float 9 can slightly roll in the planting traveling state.

When the aircraft reaches the ridge from the above-described planting running state, the operator temporarily stops planting and turns the control handle 6.
And lift the rear part of the fuselage from the rice field G. When such an operation is performed, the front of the body lowers, so that the front of the body and the front of the center float 9 approach each other (corresponding to the second state). As a result, the first pin 10 shown in FIG. 1 enters the lower wide second long hole 16b from the upper first long hole 16a, so that the center float is provided to the body in the range of the wide second long hole 16b. 9 is the second pin 11 and FIG.
Is freely rolled around the horizontal axis P3. Then, in the rising state, the vehicle turns around the ridge and enters the next planting traveling state.

[Alternative Embodiment] As described above, the left and right wheels 3
a walking type rice transplanter equipped with only a lifting / lowering control means for vertically driving a and 3b in the same direction; and a rolling control means for vertically driving the left and right wheels 3a and 3b in opposite directions in addition to the lifting / lowering control means. A walk-behind rice transplanter equipped with is described.

As shown in FIG. 6, a bracket 23 is fixed to the left linkage rod 22.
A double-acting second hydraulic cylinder 24 (corresponding to an actuator) is erected and connected between the first hydraulic cylinder 18 and the bracket 20 on the first hydraulic cylinder 18 side. With this structure, for example, when the second hydraulic cylinder 24 is extended, the left transmission case 2 and the wheel 3a are pivoted downward. In conjunction with this operation, the balance arm 21 is pivoted counterclockwise in FIG. 6 via the link rod 22, and the right transmission case 2 and the wheel 3b are pivoted upward. That is,
By the expansion and contraction operation of the second hydraulic cylinder 24, the left and right transmission cases 2 and the wheels 3a, 3b can be vertically driven in opposite directions.

Next, the center float 9 in the walking type rice transplanter equipped with the elevating control means and the rolling control means is described.
Will be described. In this case, the rear part of the center float 9 is connected to the front and rear and left and right by a connecting member 8 in the same manner as in the structure of FIG.
In the front part of the fuselage, as shown in FIG. 5, a guide member 16 having a first pin 10, a second pin 11, and first and second long holes 16a and 16b having the same structure as shown in FIGS. A bracket 15 having a hole 15a is provided. In this case, the first elongated hole 16a of the guide member 16 is set slightly wider than the first pin 10.

As shown in FIG. 5, a second control valve 29 for the second hydraulic cylinder 24 is disposed above the transmission case 1, and an operation portion 29a of the second control valve 29 and a guide on the side of the center float 9 are provided. The member 16 is linked via an oscillating bell crank 25 and a link link 26.
1 and 2, a first control valve 28 for the first hydraulic cylinder is disposed above the transmission case 1, and the center of the base of the bracket 15 of the center float 9 and the first control valve 28 (Not shown) are linked via a link rod 17 and a swing arm 19.

In the normal planting and running state of the walking type rice transplanter, as shown in FIG. 4, the center float 9 and the machine are substantially parallel in the longitudinal direction of the machine (corresponding to the first state). Center float 9
Is grounded to the rice field surface G. In this state, when the airframe moves up and down with respect to the center float 9 as described above, the left and right wheels 3a and 3b are driven up and down in the same direction, and the airframe is maintained at a set height above the rice field surface G.

In this state, as shown in FIG.
Are located in the first elongated hole 16a of the guide member 16, and the second pin 11 is located in the second elongated hole 16b of the guide member 16, so that the second pin 11 is located within the range of the first pin 10 and the first elongated hole 16a. FIG.
The center float 9 as a whole can be slightly rolled left and right with respect to the aircraft from the position shown in FIG.

Thus, when the body is tilted left and right with respect to the center float 9 following the ground surface G, the second control valve 29 is slightly operated via the bell crank 25 and the like. As a result, the supply and discharge operation to the second hydraulic cylinder 24 is performed in a state where the hydraulic oil is suppressed from the second control valve 29, and the machine body
The left and right wheels 3a and 3b are slowly driven up and down in directions opposite to each other so as to be parallel to the left and right. When the body is largely tilted, the center float 9 is also tilted together with the body. Therefore, in addition to the up and down driving of the left and right wheels 3a and 3b in the opposite directions by the second hydraulic cylinder 24, the buoyancy acting on the center float 9 is increased. Center float 9
The aircraft is maintained in a state where it is parallel to the rice field surface G by the stepping down.

When the aircraft reaches the edge of the ridge from the above-described planting running state, the operator temporarily stops planting and turns the control handle 6.
And lift the rear part of the fuselage from the rice field G. When such an operation is performed, the front of the body lowers, so that the front of the body and the front of the center float 9 approach each other (corresponding to the second state). As a result, the first pin 10 shown in FIG. 5 enters the lower wide second slot 16b from the upper first slot 16a, so that the center float is provided to the body in the range of the wide second slot 16b. 9 rolls over a larger range than the above-described planting and running state.

Therefore, when the vehicle is tilted to the left and right with respect to the center float 9 following the ground surface G when making a turn in the upwardly rising state, the second control valve is provided via the bell crank 25 or the like. 29 is largely operated.
As a result, the hydraulic oil from the second control valve 29 is supplied to and discharged from the second hydraulic cylinder 24 to the second hydraulic cylinder 24 at a larger flow rate than in the above-described planting and running state, so that the left and right sides are parallel to the rice field G. The wheels 3a and 3b are quickly driven up and down in opposite directions.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a front view showing the vicinity of a front portion of a center float in a walking type rice transplanter equipped with only a lifting control means.

FIG. 2 is a side view of the vicinity of a front portion of a center float in a walk-behind rice transplanter equipped with only a lifting control means.

FIG. 3 is a plan view showing a vertical drive structure of left and right wheels in a walking rice transplanter equipped with only the elevation control means.

FIG. 4 is an overall side view of a walk-behind rice transplanter equipped with only lifting control means.

FIG. 5 is a front view of the vicinity of the front part of the center float in the walking rice transplanter equipped with the elevation control means and the rolling control means.

FIG. 6 is a plan view showing a vertical drive structure of left and right wheels in a walking rice transplanter equipped with a lifting control means and a rolling control means.

[Explanation of symbols]

 3a, 3b Wheels for traveling 8 Rear fulcrum of center float 9 Center float 16 Restriction mechanism 24 Actuator G Field surface

Claims (2)

(57) [Claims] 1. A vertically long center float (9) is vertically and freely swingably connected around a rear fulcrum (8) and is freely rotatable left and right at the center of the lower part of the fuselage. The center float (9) in a first state in which the center float (9) and the body are substantially parallel to each other.
And the front part of the center float (9) and the front part of the fuselage approach each other.
A walking paddy working machine provided with a regulating mechanism (16) for allowing left and right rolling of the center float (9) in the state. 2. A left and right running wheel is connected to a left and right center of a lower portion of the fuselage by connecting a vertically long center float (9) vertically swingably around a rear fulcrum (8) and freely rolling left and right. (3) The actuator (24) for vertically driving (3b) in directions opposite to each other, and the aircraft is moved to the rice field (G) based on the inclination of the aircraft left and right with respect to the center float (9) following the ground (G). Rolling control means for operating the actuator (24) so that the center float (9) and the fuselage are substantially parallel to each other in the longitudinal direction of the fuselage. 9) The right and left rolling of the center float (9) is regulated, and the center float (9) is in the second state in which the front part of the center float (9) and the front part of the body approach each other. 9) A walking paddy working machine provided with a regulation mechanism (16) that allows left and right rolling.