JPH09262011A - Planting part elevation control device for riding type rice transplanter - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To raise / lower control of a riding type rice transplanter when automatically controlling the raising / lowering of the rice transplanter by a change in elevation angle of the float or a change in ground contact pressure of the float. The purpose is to prevent deep planting of the planting depth during control. SOLUTION: A rice planting device 19 equipped with a landing planting float having a rearing fulcrum and a front part capable of moving up and down in a front part can be moved up and down by a hydraulic device to a towing vehicle 1. The automatic planting depth adjusting device which is mounted via the flexible link mechanism 15 and is capable of automatically adjusting the planting depth by vertically adjusting the rear fulcrum of the grounding float 25, and at the same time, the hydraulic device. 17 is operated by the fluctuation of the ground contact pressure or the fluctuation of the elevation angle of the front part of the float to automatically control the rice transplanter 19 so that the variable condition of the float is kept within an appropriate predetermined standard. A planting part lifting control device for a riding type rice transplanter, wherein the automatic planting depth adjusting device is temporarily controlled to a shallow planting state when the rice planting device is controlled to be raised and lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planting section elevation control device for a riding type rice transplanter.

[0002]

2. Description of the Related Art In a conventional riding type rice transplanter, a rice transplanter is controlled to move up and down with respect to a towing vehicle by changing the angle of elevation (elevation angle) of the float and the ground contact pressure. Also, the depth of seedling planting of the rice transplanter was adjusted manually by vertically adjusting the rear pivot point of the float itself.

[0003]

In the prior art, the rice planting device is controlled to be moved up and down by the hydraulic device by the fluctuation of the elevation angle on the front side of the float and the fluctuation of the ground pressure of the float itself. There is a drawback that the operation of the hydraulic switching valve due to the command to raise the rice transplanting device is delayed and the rice transplanting device rises slowly, resulting in a deep planting state. That is, the seedlings were sometimes buried in the topsoil of the paddy field before the rice transplanter was raised.

[0004]

The present invention takes the following technical means in order to solve the above-mentioned problems. That is, a rice planting device 19 equipped with a grounding float 25 having a rear part as a fulcrum and a front part vertically movable
Is attached to the towing vehicle 1 via a link mechanism 15 which can be moved up and down by a hydraulic device, and the rear rotation fulcrum of the soil leveling float 25 is vertically adjusted to automatically adjust the planting depth. In addition to configuring an automatic adjusting device, the hydraulic device 17 is operated by fluctuation of the ground contact pressure or fluctuation of the elevation angle of the front part of the float so that the variable condition of the float is kept within an appropriate predetermined standard. The device 19 is automatically controlled to move up and down, and when the rice planting device is controlled to move up and down, the automatic planting depth adjusting device is temporarily controlled to be in a shallow planting state. The control device.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the present invention will be described in detail with reference to the drawings. Reference numeral 1 is a passenger-type tow vehicle. This towing vehicle 1 has a front mission case 3 on the front side of a vehicle body 2 and a rear transmission on the rear side.
The mission cases 4 are separately arranged on the left and right sides, and the front mission case 3 is provided with a front axle case projecting to the left and right, and a pair of left and right steering drive front wheels 5 are attached to the front axle case. Drive rear wheels 6 are attached to the outside of each of the transmission cases 4. Reference numeral 7 denotes an engine, which is mounted on the front-rear intermediate portion of the vehicle body 2. 8 is the boarding floor
Thus, it is stretched on the upper surface of the vehicle body 2 and has a shape that also serves as the engine cover 9 and the fan 10 of the rear wheel 6. 1
Reference numeral 1 denotes a control frame, which is located in the front left-right intermediate portion of the vehicle body 2 and projects upward from the upper surface of the floor 8, and a control handle 12 and instruments are provided on the upper side thereof.

Reference numeral 13 is a control seat, which is the engine cover 9
It is arranged above. Reference numeral 14 is a column that is erected on the rear right and left intermediate portions of the vehicle body 2. 15 is a lifting link mechanism,
The base side of the upper link 15a and the lower link 15b is the pillar 1
4, a rear end portion of which is connected by a connecting link 15c to form a parallel link mechanism, and a lever 16 integral with the upper link 15a is connected to the vehicle body at one end thereof.
The link mechanism 15 is connected to the mechanism 17 so that the link mechanism 15 is actuated by moving the piston rod 17b of the hydraulic cylinder-mechanism 17 in and out. Reference numeral 17a indicates a hydraulic cylinder.

A rolling hitch body 18 is attached to the connecting link 15c, and a working machine is mounted on the rolling shaft. A rice transplanter 19 is mounted on the hitch body 18 so that the center of the rice transplanter can be rolled. The rice planting device 19 will be described. A seedling placing table 21 is attached to the upper part of the front part of the transmission case 20 which also serves as a frame so as to reciprocate left and right, and is branched left and right at the rear side of the transmission case 20. The seedlings placed on the seedling placing table 21 are separated into the protruding projecting portion transmission case, and the planting mechanism 22 is attached to the lower field scene.

In this planting mechanism 22, the rotation direction and the number of rotations are the same as the number of rotations of the rotation case 23 on the outside of the front and rear ends of the rotation case 23 which is rotated around the center of the front and rear as a supporting shaft. , The rotary shafts of which the angular velocities partially change are projected, and the seedling planting fixtures 24 are attached to the respective rotary shafts.
The planting claw attached to the plant is constructed so as to draw a seedling split transplant locus (a).

Reference numeral 25 is a central portion float, and 26 is a side portion float disposed on both right and left sides of the central portion float.
These floats 25, 26, 26 are the rice transplanter 19
It is mounted on the transmission case 20 side of the planting part so that the front part can move up and down with the rear part as a fulcrum. The mounting structure of the float will be described in detail. The front portion of each of the floats 25, 26, 26 is fixed by a downward arm 28 fixed to a horizontal shaft 27 rotatably mounted on the transmission case 20. A planting depth adjusting lever 29, which is pivotally mounted so as to be swingable up and down and has a base portion fixed to the horizontal shaft 27 and projects upward, is attached, and the adjusting lever 29 is stepped by a servomotor M. It operates by the piston rod of the cylinder-30, and the planting depth can be adjusted by the forward and reverse rotation of the motor M.

The attachment of the central portion float 25 to the frame side on the front side is as follows. That is, the transmission case
A link 3 in which the base side is pivotally attached via pins 31a and 31b to a frame member 20a provided integrally with the frame 20.
The front end sides of the reference numerals 2 and 33 are pivotally connected to each other by a vertical link 34 to form a parallel link 35, and the rear end side of the swing member 36 having the front and rear intermediate portions pivotally attached to the vertical link 34 and the central portion float 25. The front side is connected by a rod 37. Reference numeral 38 denotes an interlocking member, which is an arm 39 integral with the pin 31a pivotally attached to the frame member 20a and fixed to the base side of the link 32, and the planting depth adjusting lever 29. When the respective floats are vertically adjusted so as to adjust the planting depth, the parallel link 35 side is also adjusted and swung in the same vertical direction. The structure in which the interlocking member 38 is connected to the arm 39 is a structure in which the tip end side of the interlocking member 38 is formed as a screw shaft and a nut 40 that is screwed onto the screw shaft is pivotally attached to the arm 39. The position of the front side of the parallel link 35 can be adjusted up and down by adjusting the screwing movement of the alignment nut 40.

Reference numeral 41 denotes a projecting frame in which the base side is fixedly attached to the vertical link 34 so as to project upward, and is a wire connected to a sensitivity adjusting lever 42 provided near the control seat 13 of the towing vehicle 1. The outer 43a of 43 is locked, one end of the spring 44 is attached to the inner 43b, and the other end of the spring 44 is connected to the front side position of the swing member 36. That is, the tension of the spring 44 urges the front portion of the float 25 downwardly to keep the swinging member 36 in the balance state.

Reference numeral 45 is a potentiometer, which is attached to the upper portion of the vertical link 34, and is used to detect the meter 45.
The rod 46 and the swing member 36 are connected to each other, and the upper and lower positions on the front side of the float 25, that is, the central part 25
The angle of elevation can be detected by changing the electric resistance applied to the potentiometer 45 by the rod 37, the swing member 36, the rod 47 and the detection arm 46.

The operation control of the hydraulic cylinder mechanism 17 will be described. From the hydraulic pump 48 to the hydraulic cylinder--
Electromagnetic solenoids SOL1 and SOL in the oil passage into 17
A switching valve 49 that can be switched by 2 is provided, and the lifting link mechanism 15 is operated by this switching valve 49, and the rice transplanter 1
9 is configured to be controlled to move up and down. Reference numeral 50 in the figure denotes a hydraulic tank.

A command signal to the solenoids SOL1 and SOL2 is issued from the controller CPU of the microcomputer, and the command signal is sent by the detected value from the potentiometer 45 to the controller CPU. The signal of this detected value is compared with the standard value stored in the controller to perform an operation such as comparison and issue an appropriate command signal to control the switching time of the switching valve 49 and the opening / closing control of the switching valve to properly adjust the rice transplanting device 19. It is configured to control up and down.

To explain this example concretely, the standard value of the elevation angle of the float is stored beforehand in the controller CPU, and the standard value and the potentiometer 45 are set.
The solenoid SOL1, S
The OL2 is excited and released to control the hydraulic cylinder mechanism 17 to control the rice transplanter 19 up and down. That is, when the float 25 becomes larger than the standard elevation angle, the rice planting device 19 is raised to return to the standard value, and conversely, when the elevation angle becomes less than the standard value, the rice planting device 19 is lowered to set the elevation angle to the standard value. It is configured to return to the inside, and is configured to be propelled while always maintaining an appropriate elevation angle.

Another example of raising / lowering control will be described. As an example of raising / lowering control of the rice planting device 19 by the fluctuation of the ground pressure received by the float from the surface soil surface of the paddy field, the configuration shown in FIG. 4 is generally used. . That is, the piston of the stepping cylinder 30 operated by the servomotor M and the arm 2
8, the ground pressure received by the float is measured by interposing a potentiometer 51, and the measured value is transmitted to the controller CPU to store the standard ground pressure stored in advance. The solenoids SOL1 and SOL2 are excited and released by performing a comparison calculation with. That is, when the ground pressure becomes larger than the reference value, the rice transplanter 19 is raised, and conversely,
It is configured to descend when it becomes smaller.

In addition to the command signal from the control CPU for switching the switching valve 49 of the hydraulic system by the solenoids SOL1 and SOL2, a control signal for planting depth is issued. That is, in any of the above-mentioned embodiments, the signal for raising the rice transplanter 19 side, the flow
When the elevation of the gutter 25 increases and the front part of the float rises
When the ground pressure of the plant becomes large, the switching valve 49 is switched and the command signal for raising the rice planting device 19 by projecting the piston rod 17b is issued. At the same time, the command signal for making the planting depth shallow is provided. -Sent to M.
That is, the motor M is rotated in the direction in which the piston projects from the stepping cylinder-30 as indicated by the arrow (b), and the arm 2
8 rotates in the direction of the arrow (c) and works to press the float 25 against the field scene, and automatically becomes a shallow planting state for a moment.

Explaining the operation of the above example, a mat-like seedling with soil is mounted on the seedling placing table 21 on the rice transplanter 19 side,
In the paddy field, the rice planting device 19 side is lowered by a hydraulic switching lever provided in the vicinity of the control seat 13 so that each of the floats 25, 26, and 26 for arranging the seedling planting part contacts the surface soil surface of the paddy field. To drive the engine 7 to rotate and drive each part.
While traveling, the various parts on the rice planting device 19 side are transmitted to start seedling planting work.

Then, the seedling placing table 21 reciprocates left and right laterally, and the seedling planting tool 24 of the planting mechanism 22 holds the seedlings from the seedling placing table 21 one by one and divides and holds each seedling. Two
Seedlings are planted on the area prepared by 5, 26, 26. When the paddy field becomes deep during such work,
The front wheels of the towing vehicle 1 for traveling and the rear wheels 5 and 6 come into contact with the deep cultivator, so that they sink deeply from the surface of the field, so that the ground contact pressure received by the respective floats 25 and 26 becomes large. Then, as the float deeply sinks from the paddy soil, mud pushing occurs, the front side of the float 25 is also pushed up, and the elevation angle becomes large.

Therefore, since the float 25 moves upward, the rear portion of the swing member 36 is pushed up via the rod 37, and the front portion is rotated upward to detect the detection arm 46 via the rod 47.
Rotates upwards and the potentiometer 45 moves the float 25
Elevation angle is detected and its value is sent to the controller CPU. Then, the reference value of the elevation angle stored in the controller CPU is compared with the previously measured elevation angle value, and the solenoid S for operating the switching valve 49 from the controller CPU is calculated.
A command signal is issued to OL1 and SO12, the switching valve 49 is switched, and the rice transplanting device 19 is vertically controlled by the vertically moving link mechanism 15.

Further, in another embodiment, the ground pressure applied to the rear side of each float is detected by the potentiometer 51 and the detected value is sent to the controller CPU. Then, the reference value previously stored in the controller CPU and the detected value are compared and calculated, and the solenoid SOL is obtained.
1, a command signal is issued to SO12, the switching valve 49 is switched, and the rice transplanting device 19 is vertically controlled by the vertically moving link mechanism 15.

In this way, the rice transplanting device 19 is automatically controlled up and down by the elevation angle variation of the float or the ground contact pressure variation of the float. Then, during this control, when the front part of the float 25 goes up and the elevation angle becomes too large, or when the ground contact pressure of the float becomes too large, the rice transplanting device 19 is raised, but at this time, The rear part of the float is temporarily lowered to control shallow planting. That is, the hydraulic cylinder-mechanism 1 is provided on the side of raising the rice transplanter 19.
When the switching valve 49 of No. 7 is switched, the stepping servomotor M rotates to operate the cylinder 30 so as to press the rear side of the float against the field scene.

Therefore, when the rice transplanting device 19 is controlled to be raised, the ground contact pressure is not reduced and the leveling performance is not temporarily deteriorated. Since seedlings do not occur during planting, reliable planting is possible. Further, the rising control of the rice transplanting device 19 is swift due to the float lowering, and since the rising delay does not occur, it is possible to eliminate the deep planting state and the buried planting immediately before the rising control.

Although a check valve is frequently used in a hydraulic circuit, it is required in the market to quickly depressurize the check valve with a light force. Conventionally, the ball in the check valve was pushed against the spring against the inside of the high pressure chamber with the operating pin to depressurize, but the fitting hole of the chuck ball is generally small in diameter and the hydraulic oil is drained from there. It was taking time. Also, the ball had to be kept open against the spring for a long time.

Therefore, this is improved as shown in FIG. A valve chamber 56 is formed between a port P for feeding hydraulic oil from the pump side to the main body 55 of the check valve and a port S for appropriately feeding it into the cylinder, and the check chamber is provided in the chamber 56. A poppet 59 that forms a check chamber 58 into which the ball 57 is fitted is provided, and the poppet 59 is pressed against the inner surface of the valve chamber 56 by the first spring 60, and the inner ball 57 is formed in the poppet 59. The second spring 61 presses the throttle hole portion to prevent hydraulic oil from passing from the chamber (d) side of the valve chamber 56 to the chamber (e) side. A push pin 62 is provided inside the chamber (e) so that it can be pushed and pulled, and a ball pushing portion a and a poppet pushing portion b are continuously formed on the tip end side.

With this structure, the ball 57 is first pushed open by the tip side portion a of the push pin 62, and the oil in the chamber (d) flows into the chamber (e), so that the pressure in the chamber (d) is increased. When it goes down, the pivot 59 is now pushed by the push pin 62 to widen the flow passage. Therefore, the oil in the chamber (d) flows to the tank side and the check valve can be opened only by pushing the push pin 62 with an extremely small force. In the figure, 63 is an o-ring and 64 is a closing bolt.

[0027]

According to the present invention, when the rice transplanter is controlled to rise, the ground contact pressure is not reduced and the leveling performance is not temporarily deteriorated. As the ground is secured, the seedlings will not fall during planting and reliable planting will be possible. Further, the rising control of the rice transplanting device is speeded up by the float lowering, and since the rising delay does not occur, it is possible to eliminate the deep planting state and the buried planting immediately before the rising control.

[Brief description of drawings]

FIG. 1 is a side view

FIG. 2 is a side view including a control circuit of a main part.

FIG. 3 is a side view of a main part.

FIG. 4 is a control circuit diagram of another example.

FIG. 5 is a sectional side view of a hydraulic valve of another example.

[Explanation of symbols]

 1 Towing vehicle 15 Lifting link mechanism 17 Hydraulic system (hydraulic cylinder-mechanism) 19 Rice transplanter 25 Leveling float

Claims (1)

[Claims] 1. A rice planting device 19 equipped with a landing planting float having a rearing fulcrum and a front part capable of vertically moving up and down is installed on a towing vehicle 1 by a hydraulic system. It is mounted via a link mechanism 15 that can be installed, and a rear planting fulcrum of the leveling float 25 is vertically adjusted to constitute an automatic planting depth adjusting device capable of automatically adjusting the planting depth. The device 17 is operated by the fluctuation of the ground contact pressure or the fluctuation of the elevation angle of the front part of the float to automatically control the rice transplanting device 19 so that the variable condition of the float is kept within an appropriate predetermined standard. A raising / lowering control device for a planting part in a riding-type rice transplanter in which the automatic planting depth adjusting device is temporarily controlled to a shallow planting state during the raising control of the raising and lowering rice planting device.