JPH0819314A - Height control device for paddy work machine - Google Patents

Abstract

(57) [Abstract] [Purpose] The thickness of the mud B and the depth of the water C stretched on it are detected, and the work device 2 is moved up and down by a signal from both to raise the height of the mud B from the surface. The depth is kept within a certain range, and the detection accuracy of a deep water sensor that detects the depth of water is improved. [Structure] Vehicles 4 and 5 rolling on a cultivator A, a working device 2 for sowing and transplanting seedlings on a mud surface, and a sensor float 9a for sliding on the mud surface are provided. Is a paddy working machine that keeps the working device 2 at a constant height from the mud surface by a drive device moving the wheels 4, 5 or the working device 2 up and down in response to a signal from A water depth sensor 23 that detects the depth of C and corrects the height of the working device 2 by the depth is provided, and this water depth sensor 23 is provided in front of the sensor float 9a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a paddy working machine for sowing or transplanting seedlings in a paddy field.

[0002]

2. Description of the Related Art In paddy fields, soft mud is placed on a hard cultivator and water is spread on it. Then, the paddy work machine rotates the wheels on the cultivator to move forward, and the work device performs sowing and transplanting of seedlings on the surface layer of the mud. If there is a shallow depth in the cultivator with respect to the mud surface, the vertical movement of the wheels with respect to the mud surface causes the working device to move up and down, and the depth of seeding and transplantation will change. In order to prevent this, a sensor float that slides on the mud surface is used, and this sensor float is configured to be pushed up or down at the depth of the cultivator.
The drive device is operated to move the wheels (walking type) and the working device (riding type) up and down, so that the working device is kept at a constant height above the mud surface.

On the mud surface, water has a certain depth (2
~ 3 cm). The sensor float is relatively wide and slides on the mud surface, but it is affected by deep water and is kept at a high position with respect to the mud surface. To slightly higher (right of Fig. 4), there is a tendency for shallow planting. The opposite is true when the water is shallow (left in FIG. 4).

In order to compensate for this, a device using a water depth sensor has been proposed, and it has been attempted to control in the central state of FIG. 4 regardless of the depth of water (Japanese Patent Laid-Open No. 54-66216).
JP-A-59-179909, JP-A-5-3081
No. 8), the water depth sensor is arranged on the side of the sensor float.

[0005]

Here, in order to improve work efficiency, the speed of paddy work machines has been increased. Then, the conventional water depth sensor receives the swell of water that is generated by the forward movement of the sensor float and flows beside it, and an error occurs due to the difference in the forward movement speed of the paddy working machine, which makes it impossible to obtain a satisfactory detection result. There is a risk.

[0006]

In order to solve the above-mentioned problems, the present invention relates to wheels 4, 5 rolling on a cultivator A and a working device 2 for sowing and transplanting seedlings on a mud surface. It has a sensor float 9a that slides on a mud surface, and the drive device drives the wheels 4, 5 or the working device 2 by a signal from this sensor float 9a.
Is a paddy working machine that raises and lowers the working device 2 to keep the working device 2 at a constant height above the mud surface. 2 is provided with a water depth sensor 23 that corrects the height, and the water depth sensor 23 is provided in front of the sensor float 9a.

[0007]

When the paddy working machine constructed as described above is operated in the paddy field, the machine body is advanced by the wheels 4 and 5 rolling on the cultivator A, and the working unit 2 sows seedlings and seedlings on the top soil of the mud B. Transplant. At this time, the sensor float 9a slides on the surface (mud surface) of the mud. When the cultivator A is deeper than the mud surface (the mud B is thick), the wheels 4 and 5 sink and the lower surface of the sensor float 9a is pushed up. Incidentally, since the sensor float 9a normally swings around the horizontal axis 10 at the rear end, the front end thereof is pushed up. Then, a drive device such as a hydraulic device or a transmission motor is activated by the signal, and the wheels are pushed down (the work device 2 is pulled up in the riding type), and the height of the work device 2 is within a certain reference range with respect to the mud surface. Keep on.
The reverse is true when the cultivator A is shallow (when the mud B is thin). When this is illustrated, as shown in the center of FIG. 4, when the sensor float 9 is within the height range of the neutral zone N, the drive device does not operate, but when it moves up and down beyond this, the drive device is driven. The device operates to adjust the position of the work device 2.

When the water C stretched over the mud B is deep, the sensor float 9a is positioned slightly higher due to the deep water. That is, as shown in the right side of FIG. 4, the neutral zone N moves to the higher side, and the working depth tends to become shallow. At this time, the water depth sensor 23 detects the depth of this water, and the neutral zone N is detected by the signal from FIG.
Is corrected to the center of. Further, when the water C is shallow, the neutral zone N moves to the lower side and the state shown in the left side of FIG. 4 is reached. At this time, too, the signal from the water depth sensor 23 changes this to the central state of FIG. Will be corrected.

The water depth sensor 23 has a sensor flow.
The depth of the water C is detected in front of the door 9a and a signal is emitted.

[0010]

[Effect] As described above, according to the present invention, the paddy working machine has the sensor float 9 that slides on the surface (mud surface) of the mud B.
The thickness of the mud B is detected by a, the working device 2 is moved up and down with respect to the cultivator A, and its height is kept within a certain range with respect to the mud surface. In the above detection of the sensor float 9a, the water on the mud B influences and an error occurs at the depth, but the water depth sensor 23 detects the depth of the water, and the signal corrects the above influence. To be done. And this water depth sensor 23
Since it is provided in front of the sensor float 9a and is not affected by the rise of water on the side of the sensor float 9a that occurs with the forward movement of the aircraft, the depth of the water C is accurately detected, Emits the correct signal. As a result, the working device 2
It is kept at a constant height against the mud surface without being influenced by water or the forward speed of the airframe.

[0011]

Embodiments of the present invention will be described below. FIG.
And as shown in FIG. 2, after the traveling vehicle body 1, the seedling planting device 2 which is one of the working devices is attached by the pair of upper and lower links 3 and 3, and the riding type seedling planting device which is one of the paddy working machines. Has become.

The traveling vehicle body 1 is provided with a pair of front wheels 4 and 4 and rear wheels 5 and 5 which roll on the cultivator A under the power of an engine (not shown). The seedling planting device 2 is
The gear box 6 connected to the links 3 and 3, the seedling mount 7 on which the mat-shaped seedlings are placed obliquely tilted forward, and which is reciprocally driven left and right, is arranged at the rear of the seedling mount 7. A seedling planting rod 8 that swivels up and down along a long oval guide and transplants the seedling placing base on the seedling placing base 7 to the mud B below, and slides on the surface (mud surface) of the mud B to produce the seedling planting 8 Float 9 to level the mud surface for transplanting seedlings
Composed of. Eight seedling rods 8 are arranged horizontally and at substantially equal intervals. The float 9 is composed of a central sensor float 9a and left and right side floats 9b and 9b. And these floats 9a, 9b, 9b
The rear part is attached to the gear box 6 by the horizontal shaft 10, and the front part is configured to swing around it. Further, the tip ends of the side floats 9b, 9b are connected to the gear box 6 by respective hip-folding type links 11.

As shown in FIG. 3, the stay 12 extends forward from the center of the gear box 6. The upper rod 13 and the lower rod 14 are rotatably connected by an intermediate pin 15 to form a <-shaped waist-folding link, and upper and lower ends of the stay 12 are formed by pins 16 and 17.
And is attached to the front end of the sensor float 9a. In the figure, the hydraulic cylinder 18, a rod 18a protruding upward from the hydraulic cylinder 18, a valve 19 and a pump (not shown) constitute a drive unit. A transmission motor type drive device may be used in place of this hydraulic type drive device. As shown in FIG. 2, the arm 20 extends downward from the tip of the upper link 3, and the lower end of the hydraulic cylinder 18 and the upper end of the rod 18a are connected to the traveling vehicle body 1 and the arm 20, respectively. Cylinder 18
When the oil is fed into the inside, the links 3 and 3 rotate counterclockwise to pull up the seedling planting device 2, and when the oil in the hydraulic cylinder 18 is drained, the links 3 and 3 rotate clockwise. It rotates so that the seedling planting device 2 descends.

The valve box 19a is attached to the stay 12 by the pin 16, and the lower end of the valve rod 19b protruding downward is attached to the pin 17. And the valve rod 19b is new.
When it is in the trawl zone N (Fig. 4), the oil discharged by the pump returns to the tank, and when the valve rod 19b is inserted above the zone N, the oil discharged by the pump is transferred to the hydraulic cylinder. The oil in the hydraulic cylinder 18 is returned to the inside of the tank when the valve rod 19b is sent to the inside of the tank 18 and slips out beyond the zone N.

A stay 21 extends forward from the front end of the center float 9a, and a horizontal shaft 22 is rotatably attached to the front end thereof. An arm 23b extends obliquely upward from the spherical float 23a, and its upper end is fixed to the horizontal shaft 22 so that the water depth sensor 2
It is 3. That is, when the water C on the mud B is deep, the float 23a rises and the rotary shaft 22 rotates clockwise, and when the water C is shallow, the float 23a descends and the rotary shaft 2 rotates.
2 rotates counterclockwise. The float 23a is arranged in front of the sensor float 9a.

A lever 24 projects upward from the rotary shaft 22, and a tension spring 25 is provided between the upper end of the lever 24 and the intermediate portion of the upper rod 13.
Both ends of are locked. Therefore, the front wheels 4, 4 and the rear wheels 5, 5 roll on the cultivator A to move the traveling vehicle body 1 forward,
While the float 9 slides on the mud surface, the seedling planting rods 8, 8 ... Transplant the seedlings on the surface of the mud B. When the front wheels 4, 4 and the rear wheels 5, 5 come to a deep place in the cultivator A, the gear box 6 approaches the mud surface.

Then, the horizontal axis 10 is lowered, and the rear end of the sensor float 9a is pushed down to the mud surface, so that the tip end is raised and the valve rod 19b is pushed into the valve box 19a. When the pushing force exceeds a certain range (neutral zone N), the oil discharged from the pump is switched by the valve 19 and flows into the hydraulic cylinder 18 as described above, and the links 3, 3 Rotates counterclockwise and the gear box 6 is pulled up. On the contrary, when the front wheels 4, 4 and the rear wheels 5, 5 come to a shallow place on the cultivator A, the sensor flow is reduced.
The tip of the valve 9a descends, the valve rod 19b is pulled down, and when the pulling down exceeds a certain range (neutral zone N), the oil in the hydraulic cylinder 18 falls out and the gear box 6 goes down.

The water C on the mud B has a standard length of 2 to 3 cm, which sets the position of the neutral zone N. On the contrary, if the water C is shallow, the center float 9
The tip of a is downhill to the mud surface, and conversely, when the water C is deep, it is uphill to the mud surface. Therefore, FIG.
When the water C is shallow, the neutral zone N moves to the left, and the tip of the sensor float 9a comes close to the mud surface, and when the water C is deep, on the contrary, It is a position far away from the mud surface. As a result, if the water C is shallow,
The seedlings tend to be deeply planted, and when the water C is deep, the seedlings tend to be shallowly planted. At this time, if the water C is shallow, the float 23a descends, the lever 24 rotates counterclockwise, and the tension spring 25 moves the upper rod 1.
3 is pulled forward, the tip of the sensor float 9a is strongly pulled up, and the sensor float 9
Make up for the fall of a. On the contrary, when the water C becomes deep, the float 23a rises, the lever 24 rotates clockwise, and the tension of the tension spring 25 becomes weak. As a result, regardless of the depth of the water C, the neutral zone N for switching the valve 19 is:
It is kept in the standard state in the center of FIG.

The float 23a is provided with a sensor flow.
It is arranged in front of the sensor 9a, and is not affected by water flowing up and to the left and right when the sensor float 9a moves forward. As shown in FIGS. 5 and 6, the movement of the sensor float 9a and the float 23a is controlled by the potentiometer 2.
6 and 27, and the detection results are combined and the valve 1
9 can be switched by a solenoid valve, and oil can be supplied to and discharged from the hydraulic cylinder 18 by an electromagnetic valve. Also,
The float 23a may be provided separately from the sensor float 9a. That is, the gearbox 6 has a potentiometer.
The rod 26 with the lever 26b projecting forward from its operating shaft 26a and the tip of the sensor float 9a.
Connect with 8. Then, the fluctuation of the depth of the cultivator A causes the operation shaft 2 to move.
6a rotates, and the amount of rotation of the sensor float 9a is determined from the output difference from the potentiometer 26. Also, the gear box 6
(Or the traveling vehicle body), the supporting rods 29, 29 are projected, and a vertically oriented supporting frame 31 is attached by a pair of upper and lower links 30, 30 which are parallel to each other when viewed from the side, and a rake-like sliding for sliding on a mud surface. The body 32 is fixed to the support frame 31, and the support frame 31 is pulled down by the spring 33 so that the sliding body 32 always slides on the surface of the mud B. The potentiometer 27 is fixed to the support frame 31, and the arm 23b extending from the float 23a to the upper front is fixed to the operating shaft 27a thereof. Then, potentiometer 27
Is kept at a fixed position from the surface of the mud B, and the float 23a moves up and down according to the depth of the water on the float 23a to rotate the operating shaft 27a. Therefore, the output from the potentiometer 27 changes depending on the depth of the water C. That is, as shown in the center of FIG. 4, oil is supplied to and discharged from the hydraulic cylinder 18 according to the output of the potentiometer 26, and the output from the potentiometer 27 is combined with the oil. The switching from the neutral zone N is performed at a fixed position regardless of the depth of water.

As shown in FIGS. 6 and 7, the sliding body 32 is
It is possible to use a lake-shaped one composed of a plate or a rod. As shown in FIGS. 1 and 2, the illustrated seedling planting machine is configured with an eight-row planting fertilizer application device. That is, the top and the inside of the pair of rear wheels 5, 5 are covered with the fender 36. 4 fertilizer hoppers 37, 37 ... and feeding devices 38, 3
8 ... are provided side by side, and these are further arranged front and back. When viewed from the side, the feeding devices 38, 38 ... Are arranged so that a part thereof is lower than the upper ends of the fender 36 and the rear wheels 5, 5, and the center of gravity is lowered so that stability is improved. ing. Each feeding device 38, 38
The hose 39, 39, ... extends from the rear end of the mound, and the fertilizer in the hoppers 37, 37 fed from this is spread on the surface of the mud B beside the seedling planting rods 8, 8. It is made like.

[Brief description of drawings]

FIG. 1 is a plan view of a seedling planting machine according to the present invention.

FIG. 2 is an enlarged side view of part 1 thereof.

FIG. 3 is an enlarged side view of part 1 thereof.

FIG. 4 is an explanatory diagram of its operation.

FIG. 5 is a side view of a main part showing another embodiment.

FIG. 6 is a plan view thereof.

FIG. 7 is a plan view showing another embodiment of the planing body.

[Explanation of symbols]

 A Plow B B Mud C Water N Neutral zone 2 Seedling plant (working device) 4 Front wheel (wheel) 5 Rear wheel (wheel) 9 Float 9a Sensor float 23 Water depth sensor (float)

Claims (1)

[Claims] 1. Wheels 4, 5 rolling on a cultivator A, a working device 2 for sowing and transplanting seedlings on a mud surface, and a sensor float 9a for sliding on the mud surface are provided. To 9
A paddy working machine in which a drive device raises and lowers the wheels 4, 5 or the working device 2 by a signal from a to keep the working device 2 at a constant height above the mud surface and is stretched on the mud surface. A water depth sensor 23 that detects the depth of the water C and corrects the height of the working device 2 by the depth is provided, and this water depth sensor 23 is provided in front of the sensor float 9a. Height control device for paddy work machines.