JPH06113629A - Working machine for paddy field - Google Patents

Abstract

PURPOSE:To surely level the surface of paddy field roughed by traveling wheels during rotation and not to reduce maneuverability in a working machine of paddy field equipped with a ground working device liftably and handleably connected to the rear of the body. CONSTITUTION:At a part of a ground working device in the rear of a right and a left traveling wheels 1 and 2, a pair of a right and a left side floats 26 long in the longitudinal direction of the body and an actuator for rising and dropping the right and left side floats 26 to the ground working device are provided. In rotation, when the ground working device is handled to rise up to a given position, the right and left side floats 26 are worked to drop, pressed against the surface of paddy field to make passage track of the traveling wheels 1 and 2 into prepared land by the side floats 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paddy working machine in which a ground working device such as a seedling planting device or a direct seeding device is connected to a rear portion of the machine body so as to be vertically movable.

[0002]

2. Description of the Related Art In a riding type rice transplanter, which is an example of a paddy working machine, a seedling planting device (corresponding to a ground working device) is connected to a rear portion of the machine body so as to be vertically movable. During the planting process in the paddy field, the seedling planting device is lowered to the paddy field to carry out the planting work, and when the planting process ends and the aircraft reaches the edge, the seedling planting device is placed on the paddy field. To a predetermined height, the vehicle makes a turn, and the seedling planting device is lowered to the rice field again to start the next planting process.

Since the turning at the edge as described above is performed with a small turning radius by steering the front wheels to the vicinity of the limit, the front surface and the rear wheels (corresponding to running wheels) often damage the rice field. . Therefore, in the seedling planting device, a rake-shaped grounding member was fixed to the rear part of the front wheel and the rear wheel, and when turning at the edge of the ridge, the seedling planting device was not raised but turned near the paddy field while turning. It has been considered that the roughened rice field where the front wheels and the rear wheels pass through is grounded by a ground leveling member.

[0004]

As described above, when turning while keeping the seedling planting device on the edge of the ridge without lowering the seedling planting device, the plurality of floats equipped on the seedling planting device are all removed. It will turn while it is in contact with the ground. When all the floats are grounded in this way, the sum of resistances applied to the respective floats becomes relatively large, which makes it difficult to smoothly turn on the ridge. Also, because the difference between the front and rear wheels inside and outside when turning makes the traces of the front and rear wheels wide on the left and right (in the turning radius direction), a leveling member is placed behind the front and rear wheels. However, this ground leveling member may not be able to level all the traces of passage of the front and rear wheels. INDUSTRIAL APPLICABILITY The present invention enables front wheels and rear wheels to pass through when turning in a paddy field to sufficiently level a rough paddy field, and to prevent a situation in which smooth turning cannot be performed due to leveling. Is intended.

[0005]

A feature of the present invention is that the paddy working machine as described above is configured as follows. In other words, a ground work device is connected to the rear part of the machine body so that it can be moved up and down, and a pair of left and right side floats that are long in the machine front-rear direction are provided at the part of the ground work device behind the left and right traveling wheels of the machine body. With an actuator that moves up and down with respect to the ground work device,
There is provided control means for operating the actuator so that the side float is lowered and pressed against the paddy field when the ground work device is raised to a predetermined position.

[0006]

With the construction of the present invention, for example, as shown in FIG. 2, when the ground work device 3 is raised to a predetermined position when turning in a paddy field, the left and right side floats 26 are lowered accordingly. It is pressed by the field G. In the above state, for example, as shown in FIG. 3, when the vehicle body is turned around the turning center S, the right traveling wheels 1 and 2 pass the loci AR and BR, and the left traveling wheels 1 and 2 are loci AL and BL. Pass through. Such trajectories AR to BL follow the left and right traveling wheels 1, 2.
After passing, the left and right side floats 26 pass over the field G while being pressed by the field G. In this case, since the left and right side floats 26 are long in the front-rear direction of the aircraft, the right side float 26 has loci CR1 and CR2.
The entire side between the locus CL1 and the locus CL2 is pushed and progresses. As the left and right side floats 26 turn while pressing a relatively wide range, the loci AR, BR of the right traveling wheels 1, 2 are positioned within the loci CR1, CR2 of the right side float 26. ,
The loci AL and BL of the left traveling wheels 1 and 2 are positioned within the loci CL1 and CL2 of the left side float 26, and the left and right traveling wheels 1 and 2 pass by the left and right side floats 26. The ground is leveled.

In the case of the present invention, only the left and right side floats of the ground work device are in contact with the rice field, and the floats other than the side floats are lifted from the rice field together with the ground work device. As a result, the floats other than the side floats do not become a resistance to the turning, and the turning can be smoothly performed with less resistance than the conventional configuration in which all the floats are grounded to make the turning.

Also, since the left and right side floats are lowered to press against the rice field in a state where the ground work device is lifted,
The left and right side floats further raise the ground work device. As a result, a part of the weight of the ground work device is applied to the left and right side floats, and the side floats are strongly pressed against the rice field surface, and even if there is a large unevenness, the side floats reliably press the surface to level the ground. be able to.

[0009]

As described above, only the side floats long in the front-rear direction of the aircraft are operated to descend and press against the rice field, so that the left and right running wheels can be surely leveled on the rice field when turning. Became. This allows
When performing work (planting of seedlings, direct seeding, etc.) in this portion after turning, it becomes possible to easily perform advance land preparation and improve workability. Since part of the weight of the ground work device can be applied to the side float and the side float can be pressed strongly against the rice field, the leveling property of the side float is also improved. Further, since only the side float is grounded, smooth turning can be performed with less resistance, and the turning performance can be improved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. (1) As shown in FIG. 1, a seedling planting device 3 (ground to ground) is provided at the rear of the body supported by a pair of left and right front wheels 1 (corresponding to traveling wheels) and a pair of left and right rear wheels 2 (corresponding to traveling wheels). (Corresponding to a working device) is connected by a link mechanism 4 and a hydraulic cylinder 5 so as to be able to move up and down, thereby forming a riding type rice transplanter which is an example of a four-wheel drive type paddy working machine. As shown in FIG. 1, the seedling planting device 3 has a single support frame 22 arranged in the lateral direction and three planting mission cases 6 connected to each other.
A planting case 8 equipped with a pair of planting arms 7 is rotatably supported by a rear portion of the planting mission case 6 of the planting plant 3, and the seedling stand 9 is placed on the left and right sides of the planting mission case 6. It is supported so that it can be reciprocally fed laterally, and as the planting case 8 rotates, the pair of planting arms 7 is moved from the seedling stand 9 to the seedling stand 9.
Are taken out alternately and planted on the rice field G.

As shown in FIG. 4, a single support shaft 23 is laid across the three planted mission cases 6.
The support arm 17 is fixed rearward to the support shaft 23 of the centered planted mission case 6, and the center float 1
The rear part of 6 is swingably supported around the horizontal axis P1 of the support arm 17. A potentiometer 19 is provided on the front part of the central planted mission case 6, and a detection arm 19 a of the potentiometer 19 and a front part of the center float 16 are connected by a rod 20.
A spring 21 that urges the center float 16 downward is provided between the centered planting mission case 6 and the center float 16.

As shown in FIG. 2A, a boss portion 24 is rotatably fitted around the support shafts 23 of the left and right planting mission cases 6, and a rearward supporting arm 25 is attached to the boss portion 24. It is fixed, and the rear portion of the side float 26 is swingably supported around the horizontal axis P2 of the support arm 25. A pair of flexible pantograph-type links 27 are connected between the front parts of the left and right planting mission cases 6 and the front parts of the side floats 26. A spring (not shown) that presses the front part of the float 26 against the rice field G has a pair of links 27.
Is provided at the connection part of. In this case, as shown in FIG. 1, the left and right side floats 26, which are long in the longitudinal direction of the fuselage,
It is arranged behind the front wheel 1 and the rear wheel 2.

The arm 2 fixed to the support shaft 23
An electric cylinder 28 (corresponding to an actuator) is vertically swingably supported around a horizontal axis P3 of 3a, and a piston of the electric cylinder 28 is connected to an arm 24a fixed to the boss portion 24. As a result, FIG.
As shown in (b), when the electric cylinder 28 is extended, the support arm 25 is swung downward, and the side float 26 can be lowered with respect to the seedling planting device 3.

(2) Next, a state at the time of turning at the ridge will be described. When the planting process is completed and the aircraft reaches the ridge, the lifting switch 29 provided in the control section of the aircraft is installed.
The operator turns on (see FIG. 4). When such an operation is performed, as shown in FIGS. 2A and 2B, the hydraulic cylinder 5 raises the seedling planting device 3 from the rice field G to a predetermined position and holds it at this predetermined position. The electric cylinder 28 is extended and the left and right side floats 26 are lowered to be pressed against the rice field G (corresponding to control means). The center float 16 in the center is lifted together with the seedling planting device 3 and floats above the rice field G.

When the steering wheel 10 (see FIG. 1) is operated in the above state and the front wheels 1 are steered as shown in FIG. 3 to start turning at the ridge, the aircraft turns around the turning center S. The right front wheel 1 is the locus AR, the left front wheel 1 is the locus AL,
The right rear wheel 2 passes on the locus BR and the left rear wheel 2 passes on the locus BL. After the front wheels 1 and the rear wheels 2 on the left and right pass through such trajectories AR to BL, the left and right side floats 26 pass on the field G while being pressed by the field G. The right side float 26 has loci CR1 and CR2.
The entire side between the locus CL1 and the locus CL2 is pushed and progresses. In this case, the loci AR, BR of the right front wheel 1 and the rear wheel 2 are within the loci CR1, CR2 of the right side float 26, and the loci AL, BL of the left front wheel 1 and the rear wheel 2 are the left side float 26. Locus CL1,
Since it is in CL2, the part where the right front wheel 1 and the rear wheel 2 have passed is grounded by the right side float 26, and the part where the left front wheel 1 and rear wheel 2 have passed is the left side float 26. The ground is leveled.

When the turning at the edge of the ridge is completed as described above, the operator pushes the up / down switch 28 again. As a result, the seedling planting device 3 is moved down to the rice field G as shown in FIGS.
The electric cylinder 28 is contracted to raise the left and right side floats 26 to their original positions. In this riding type rice transplanter, the seedling planting device 3 is configured to be automatically lifted when the vehicle is moved backward. During this reverse movement, the left and right electric cylinders 28 are not extended,
The center float 16 and the left and right side floats 26 are lifted from the rice field G together with the seedling planting device 3.

(3) Next, the raising / lowering control of the seedling planting device 3 in the riding type rice transplanter will be described. As shown in FIG. 4, the detection value from the potentiometer 19 of the center float 16 is input to the control device 11, and the sensitivity setting switch 1 capable of artificially changing the control sensitivity of the lifting control.
2 is provided. With the structure described above, it is assumed that the sensitivity setting switch 12 is set to the standard as shown in FIG. In this state, the center float 16 along with the planting run
When the landing surface G follows the paddy field G, based on the detected value from the potentiometer 19 as shown in FIG. 4, the detected value becomes the reference value A1 (the detection arm 19a of the potentiometer 19 has the reference value in FIG. 4). The control valve 13 is operated by the control device 11 to expand and contract the hydraulic cylinder 5 so that the A3 posture is achieved, and the seedling planting device 3 is automatically moved up and down. As a result, the seedling planting device 3 is automatically maintained at the set height from the paddy field G, and the seedling planting depth is maintained at the set value.

In such raising / lowering control of the seedling planting device 3, when there are many irregularities on the rice field G, the sensitivity setting switch 12
To the insensitive side. In this case, as shown in FIG. 4, the initial reference value A1 is changed to the reference value A2 corresponding to the operation position of the sensitivity setting switch 12. In such a state, the detection value from the potentiometer 19 becomes the reference value A2 (the detection arm 19a of the potentiometer 19).
Is in the posture of the reference value A2 in FIG. 4), the seedling planting device 3 is automatically moved up and down. Since the attitude of the center float 16 at the reference value A2 is higher than that shown in FIG. 4, the contact area of the center float 16 with the rice field G is reduced, and the spring 21 is compressed so that the urging force of the spring 21 is increased. Is strengthened. Therefore, in this state, the ground follow-up sensitivity of the center float 16 to the rice field G, that is, the control sensitivity of the elevation control is changed to the insensitive side.

On the contrary, when the unevenness of the rice field G is small, the sensitivity setting switch 12 is operated to the sensitive side. In this case,
As shown in, the initial reference value A1 is the sensitivity setting switch 1
The reference value A3 corresponding to the operation position 2 is changed. In such a state, the seedling planting device 3 is automatically operated so that the detection value from the potentiometer 19 becomes the reference value A3 (so that the detection arm 19a of the potentiometer 19 becomes the posture of the reference value A3 in FIG. 4). Is vertically operated. Since the attitude of the center float 16 at the reference value A3 is lower than that shown in FIG.
As the contact area of 6 with the rice field G increases, the spring 21 extends and the biasing force of the spring 21 is weakened. Therefore, in this state, the ground follow-up sensitivity of the center float 16 to the rice field G, that is, the control sensitivity of the elevation control is changed to the sensitive side.

As shown in FIGS. 1 and 4, in this riding type rice transplanter, a belt type continuously variable transmission 1 for traveling is used.
4 and a gear transmission (not shown) having two forward gears and one reverse gear. A gearshift lever 15 is provided in the control section of the machine body, the gearshift position of the gearshift lever 15 is input to the control device 11, and the continuously variable transmission 14 is geared to a position corresponding to the gearshift position of the gearshift lever 15 by the electric cylinder 18. Operated. As shown in FIG. 5, when the planting work is running in the paddy field, the speed change lever 15 is set to 69% or less of the maximum speed and 79-.
When operating to the 70% shift position, the control sensitivity set by the sensitivity setting switch 12 is used as it is (setting value). Shift gear 15 to maximum speed of 89-
When operating to the 80% shift position, the control sensitivity (set value) set by the sensitivity setting switch 12 is changed to the insensitive side by the set amount a, and the shift lever 15 is set to the shift position from the maximum speed to 90%. When operated, the control sensitivity (set value) set by the sensitivity setting switch 12 is changed to the insensitive side by the set amount 2a.

[Embodiment] In the embodiment shown in FIGS. 2 (a) and 2 (b), the hydraulic cylinder 5 raises the seedling planting device 3 from the rice field G to a predetermined position, and the electric cylinders 28 move the left and right side floats 26. 2 is operated to lower the left and right side floats 26 by the electric cylinder 28 without operating the hydraulic cylinder 5 in this state, and the left and right side floats 26 are used to move the seedlings as shown in FIG. The planting device 3 may be configured to be lifted from the rice field G.

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 configuration of the accompanying drawings by the entry.

[Brief description of drawings]

[Fig. 1] Overall side view of the riding rice transplanter

FIG. 2 is a side view showing a raising / lowering state of a seedling planting device and a side float.

FIG. 3 is a schematic plan view showing a passing state of left and right front wheels and rear wheels and left and right side floats when turning.

FIG. 4 is a view showing a linked state of a speed change lever, a continuously variable transmission, a lifting switch, and the like.

FIG. 5 is a diagram showing a relationship between a shift position of a shift lever and a control sensitivity of lift control.

[Explanation of symbols]

 1, 2 traveling wheels 3 ground work device 26 side float 28 actuator G Tamochi

Claims (1)

[Claims] 1. A ground work device (3) is connected to a rear portion of the machine body so as to be vertically movable, and traveling wheels (1), (2) on the left and right of the machine body are provided.
A pair of left and right side floats (26) long in the machine front-rear direction are provided in a portion of the ground working device (3) behind the ground working device (3), and the left and right side floats (26) are moved up and down with respect to the ground working device (3). Actuator (2
8), and the side float (26) along with the ascending operation of the ground work device (3) to a predetermined position.
A paddy working machine provided with a control means for operating the actuator (28) so that the actuator is moved down and pressed by the rice field (G).