JPH0771413B2 - Inclination control device for riding rice transplanter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a riding-type rice transplanter provided with a rolling correction mechanism for automatically controlling the lateral tilting posture of a seedling planting device mounted on the rear portion of a traveling vehicle body.

[0002]

2. Description of the Related Art A conventional technique of this kind is disclosed in Japanese Patent Laid-Open No. Sho 5 (1993) -54, for maintaining a constant depth of seedlings transplanted on the mud surface of a paddy field.
As disclosed in Japanese Unexamined Patent Publication No. 0-11813 and Japanese Utility Model Laid-Open No. 52-25917, there is proposed a device for correcting and controlling the lateral inclination posture of the seedling planting device with the mud surface of the paddy field as a reference.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
If the leveling work on the paddy field is insufficient and there is a partial mud slope in the left-right direction, the bottom surface of the leveling float adapts to that slope,
Although the surface of the mud is smooth, the seedlings are planted along the horizontal slope. Then, if the soil at a high place was washed away at a low place at a later date, the planting depth of seedlings might be different.

Further, since the hydraulic device corrects the left and right tilted posture by the drive unit such as the electric motor, the drive unit is stopped after the posture of the seedling planting device is corrected within a certain range by the control. There is a time lag before it is done. Due to this delay, the correction swing of the seedling planting device becomes excessive, and for example, the ground level float on the descending side is forced to sink into the mud, and the seedling planting depth is not appropriate. Sometimes things happened. In order to eliminate the above situation, if the drive of the drive device is suddenly stopped, if the weight of the seedling planting device is large, the impact at the time of stopping will be large. It may cause damage.

Further, when the side portion of the seedling planting device is put on a hard ground or the like during work on the edge of the ridge, a very large swinging force acts on the seedling planting device, so that the large lateral swinging force is exerted. There is also a problem that the drive unit is damaged by being reversely transmitted to the drive unit such as a hydraulic device or an electric motor.

[0006]

In order to solve the above problems, the present invention provides a lift mechanism 2 at the rear part of a traveling vehicle body 1 that travels on a cultivator in a paddy field with front wheels 5 and rear wheels 6. Seedling planting device 3 provided with a ground leveling body 20 sliding on the mud surface of a paddy field and a planting tool 24 for transplanting seedlings on the mud surface on which the ground leveling body 20 is leveled
Is rotatably mounted on the rear end side of the lift mechanism 2 around a rolling shaft 25 in the front-rear direction, and the seedling planting device 3 is driven and swung around the rolling shaft 25 with respect to the horizontal plane of the seedling planting device 3. In a riding-type rice transplanter equipped with a rolling correction mechanism A for correcting a left-right tilted posture, a drive section for driving and swinging the seedling planting device 3 of the rolling correction mechanism A around the rolling shaft 25 has a seedling plant for the lift mechanism 2. The tilt control device for a riding type rice transplanter is characterized in that a flexible mechanism B that allows free swing of the device 3 by elastic deformation is provided.

[0007]

According to the present invention, the seedling planting device 3 comprises:
Since the rolling correction mechanism A corrects the left-right inclination posture with respect to the horizontal plane, even if the leveling work of the paddy field is insufficient and the mud surface is partially inclined in the left-right direction, the ground leveling body 20 follows the inclination. Since the mud surface is leveled horizontally by pushing down the soil in the high part, and after that, the seedlings are planted by the planting tool 24, the planting depth of the seedling becomes constant, and the conventional problems Will be resolved.

Also, the seedling planting device 3 of the rolling correction mechanism A
The drive part that drives and swings the
Since the interchange mechanism B which allows the free swinging of the seedling planting device 3 with respect to the lift mechanism 2 by elastic deformation is provided, unnecessary driving and reaction force due to the delay of the rolling correction mechanism A or the sudden stop is applied to the seedling planting device. It is absorbed by the interchange mechanism B which allows the free swing of 3 by elastic deformation, and proper work can be performed, and the conventional problems can be solved.

Further, even when a very large swinging external force acts on the seedling planting device at the time of work on the edge, due to the elastic deformation of the accommodation mechanism B, the large lateral swinging external force is reversed to the rolling correction mechanism A. It is possible to prevent the rolling correction mechanism A from being broken and broken due to the transmission, and to perform proper tilt control for many years.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the riding type rice transplanter has a traveling vehicle body 1 and a seedling planting device 3 connected to the vehicle body 1 through a lift mechanism 2. The traveling vehicle body 1 has front wheels 5 and rear wheels 6 in front of and behind the mission case 4 that also serves as a frame. Further, an engine base 7 extends in front of the mission case 4, and an engine 8 is mounted therein. A driver's seat 9 is provided behind it, and a steering wheel 10 is provided in front of the driver's seat. The power from the engine is transmitted to the rear wheels via the transmission case 4 and the transmission shaft 11 and to the seedling planting device 3.

The lift mechanism 2 has an upper arm 13 and a lower arm 14 pivotally mounted on a frame 12 which supports the rear wheel 6, and the lower arm 14 has two folding arms 1.
4a, 14b, and both folding arms 14a, 14b are pivotally connected to each other. The end of the lower arm 14 on the seedling planting device side is pivotally attached to the rolling metal 15 with a link 16 interposed, the upper end of the link 16 is pivotally attached to the upper arm 13, and the lower end of the link 16 is fixed to the rolling metal 15. ing.

A lower end of a lift cylinder 17 for raising and lowering the seedling planting device 3 via a lift mechanism 2 is pivotally attached to the frame 12, and an upper end of a piston rod 17a of the lift cylinder 17 is attached to an upper arm 13. A front-back inclination correction cylinder 18 for correcting the inclination of the seedling planting apparatus 3 in the front-rear direction (traveling direction) is provided between the pivot point 14c of the bending arms 14a and 14b and the upper arm 13. .

The seedling planting device 3 has a frame 19,
Below the frame is a leveling float 2 as a leveling body.
0 is attached, and the seedling tank 21 is provided above the frame 19.
Is supported by the support rod 22 and the connecting plate 23 with the upper end side inclined to the vehicle body side, the planting tool 24 is exposed to the lower end of the seedling tank, and the planting tool 24 is vertically reciprocated to move the seedling from the seedling tank 21. It is designed to be cut out one by one and planted in the rice field.

The rolling metal 15 and the frame 19 of the seedling planting device are connected by a rolling shaft 25 as shown in FIG. 2, and a supporting plate 26 extends from the rolling shaft 25 and the tip of the supporting plate 26 is extended. Is connected to a piston rod 28a of a left / right tilt correction cylinder 28 via a spring 27, and the left / right tilt correction cylinder 28 is
The rolling correction mechanism A is configured by being fixed to the ear 15a formed on the rolling metal 15. When the rolling correction mechanism A receives a lateral swinging force of a certain amount or more on the seedling planting device 3, the spring 27 is elastically deformed to swing the laterally of the seedling planting device 3 by the external force of a certain lateral swinging force. A flexible mechanism B that allows the above is provided.

The mission case 4 is located substantially in the center of the lower part of the vehicle body, and a storage case 29 is attached to the lower part of the mission case 4 for detecting the front and rear and left and right inclinations of the vehicle body 1. The pendulum type detector 30 is stored. The tilt correction cylinders 18 and 28 are operated by the signal from the detector 30.

The detector 30 and the left / right tilt correction cylinder 2
An electric control circuit and a hydraulic control circuit as shown in FIG. 3 and FIG. 4 are provided between 8 and the detector 30.
The same electric control circuit and hydraulic control circuit are also provided between the front and rear tilt correction cylinder 18. The detector 3
0 issues a left / right tilt signal and a front / rear tilt signal separately to both control circuits for left / right tilt correction and both control circuits for front / rear tilt correction according to the position of the pendulum, and the operation of each control circuit at that time Is exactly the same in the case of correcting the left-right inclination and in the case of correcting the front-rear inclination, so only the case of correcting the left-right inclination will be described in detail.

As shown in FIG. 3, the detector 30 is provided with an inclination discriminating section 40 for discriminating which of the left and right sides the vehicle body 1 is inclined, and an inclination detecting section S for detecting the amount of inclination.
The inclination determination unit 40 includes a left contact 40a that closes when the vehicle body 1 leans to the left and the seedling planting apparatus 3 leans to the left with it.
It consists of a right contact 40b that closes when it leans to the right, and the left contact 40a is connected to the left solenoid 41a of the 4-port 3-position switching valve 41 (Fig. 4) via a relay R ₁ .
The right contact 40b is connected to the right solenoid 41b of the switching valve 41 via the relay R ₂ .

The relay R ₁ is connected to the left contact 42a provided in parallel with the inclination determining unit 40, and the relay R ₂ is connected to the right contact 42b thereof.
The left and right contacts 42a and 42b are connected to a variable resistor of the inclination amount detecting section S, and the solenoid 43a of the variable relief valve 43 of FIG. 4 is connected to this variable resistor. Now, assuming that the vehicle body 1 leans to the left and the seedling planting device 3 leans to the left with it, the left contact 40a of the tilt determination unit 40 closes and the relay R ₁ operates, and the left contact 42a.
Is closed and the left solenoid 41a of the switching valve 41 is excited to move the switching valve 41 from the neutral position P ₀ shown in FIG. 4 to the left to switch to the oil passage P ₁ . Along with this, the tilt amount detection unit S detects the tilt amount, changes the resistance value of the variable resistor according to the tilt amount, and changes the exciting force of the solenoid 43a of the relief valve 43 to change the relief valve 43. Adjust the relief pressure.

In such a state, the hydraulic pressure from the hydraulic pump 44 moves the piston of the left-right inclination correction cylinder 28 to the left in the figure (FIG. 4) (in FIG. 2, the piston rod 28a extends and is supported). Since the tip of the plate 26 is pressed to the right side in the figure, the rolling shaft 25 rotates clockwise around its center axis with respect to the traveling direction.) Therefore, the leftwardly inclined seedling planting device 3 gradually becomes horizontal. Back to
At the horizontal position, the relief valve 43 operates to release the pressure oil, so that the rotation of the seedling planting device 3 is stopped at the horizontal position.

When the vehicle body leans to the right and the seedling planting device 3 leans to the right with it, the right contact 40b is closed and the relay R ₂ is actuated, the switching valve 41 is moved to the right, and the P ₂ After switching to the oil passage, the pressure oil from the hydraulic pump 44 moves the piston of the left-right inclination correction cylinder 28 to the right in the drawing (FIG. 4) and rotates the rolling shaft 25 to horizontally move the seedling planting device 3. To do. When the seedling planting device 3 becomes horizontal, the relief valve 43 operates to stop the rotation of the rolling shaft 25.

When the vehicle body 1 leans forward and leans forward with the seedling planting device 3, the piston rod 18a of the forward / backward tilt correcting cylinder 18 is extended by a circuit similar to the control circuits shown in FIGS. 3 and 4. Then, the bending arms 14a and 14b are bent downward to rotate the link 16 clockwise. Then, the rolling shaft 25 rotates so as to lower the rear part of the seedling planting device 3 along the vertical plane.

On the contrary, the vehicle body 1 is inclined rearward so that the seedling planting device 3
Also tilts rearward, the front-back tilt correction cylinder 18
The piston rod 18a is shortened within a range in which the bending links 14a and 14b are in a straight line from the reference position in the bent state shown by the solid line in FIG. 1, and the rolling shaft 25 is moved along the vertical plane including the same. Rotate the rear part of the seedling planting device so that it rises. Then, when the planting part becomes horizontal in the front-rear direction, its rotation stops.

When the vehicle body leans to the front right, such as when the vehicle leans in the left-right direction and the vehicle leans in the front-rear direction at the same time, the correction cylinders 18 and 28 operate according to the respective leaning amounts. And especially, since the rolling correction mechanism A corrects the left-right inclination posture with respect to the horizontal plane in the seedling planting device 3, even if the leveling work of the paddy field is insufficient and the mud surface is partially inclined in the left-right direction, Since the leveling float 20 does not follow the slope, the mud surface is leveled by pushing down the soil in the high part, and the seedlings are then planted by the planting tool 24. Depth becomes constant.

Further, when a lateral swinging force of a certain amount or more is applied to the seedling planting device 3, the rolling correction mechanism A is caused to swing the seedling planting device 3 laterally by the lateral swinging external force of a certain amount or more so that the spring 27 is elastic. Since the accommodation mechanism B that allows deformation is provided, during normal work, the seedling planting device 3 is automatically maintained in the proper work posture in the left-right tilted posture, and good work can be performed. Even if the movement is excessive and the work cannot be properly performed in the conventional case, the flexible mechanism B absorbs the driving force that tends to cause the seedling planting device 3 to swing excessively. Can be done.

Furthermore, the seedling planting device 3 is used during the work on the edge of the ridge.
Even when a very large swinging external force is applied to the rolling correction mechanism A, the elastic deformation of the accommodation mechanism B prevents the large lateral swinging external force from being reversely transmitted to the rolling correction mechanism A and causing the rolling correction mechanism A to fail or be damaged. Proper tilt control can be done for many years.

[Brief description of drawings]

[Figure 1] Side view of a riding rice transplanter

FIG. 2 is a perspective view of a connecting portion between a vehicle body and a planting portion.

FIG. 3 is an electric control circuit diagram of the inclination correcting mechanism.

[Fig. 4] Hydraulic control circuit

[Explanation of symbols]

1 Traveling vehicle 2 Lift mechanism 3 Seedling planting device 5 Front wheel 6 Rear wheel 20 Leveling float 24 Planting equipment 25 Rolling axis A Rolling correction mechanism B Flexible accommodation mechanism

Claims (1)

[Claims] 1. A ground leveling body 20 that slides on a mud surface of a paddy field and this ground leveling body 20 is leveled by providing a lift mechanism 2 at the rear of a traveling vehicle body 1 that runs on a cultivator in a paddy field with front wheels 5 and rear wheels 6. The seedling planting device 3 provided with a planting tool 24 for transplanting seedlings on the above-mentioned mud surface is mounted rotatably around the rolling shaft 25 in the front-rear direction on the rear end side of the lift mechanism 2 and In a riding-type rice transplanter equipped with a rolling correction mechanism A for driving and swinging the device 3 around a rolling axis 25 to correct the horizontal inclination of the seedling planting device 3 with respect to the horizontal plane, the seedling planting device 3 of the rolling correction mechanism A is A tilting control of a riding type rice transplanter, characterized in that a drive mechanism for driving and swinging around the rolling shaft 25 is provided with a flexible mechanism B which allows the free swing of the seedling planting device 3 with respect to the lift mechanism 2 by elastic deformation. apparatus.