JPH10192756A - Chemical spraying device and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect that a chemical spraying dolly has traveled by a prescribed pitch to automatically spray a chemical from a nozzle. SOLUTION: This device has a traveling dolly 1 on which a chemical spraying system is mounted for transferring a chemical to a chemical spraying nozzle 8 from a chemical tank 2 through a pump 3 and a solenoid valve 4 controlled by a controller 5. In this case, furthermore, the dolly 1 has a rotary body 9 and a sensor 11. The rotary body 9 has a part to be detected 9a and is rotated engaged with the output shaft of a traveling driving engine of the dolly. The sensor 11 detects rotational movement of the part to be detected 9a of the rotary body, thereby detecting the revolution or rotational angle of the rotary body while the dolly moves by a fixed distance, for example, corresponding to a distance A between crop roots, and outputs the detection signal to the controller 5. By a signal from the controller, the solenoid valve 4 is opened, to enable chemical spraying to crops from the nozzle 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medicine spraying vehicle which is driven at a constant pitch corresponding to the distance between crop strains (for example, tobacco strains), and automatically sprays a drug from a nozzle to the top of a crop each time. The present invention relates to a medicine spraying apparatus and method which can be easily performed.

[0002]

2. Description of the Related Art Conventionally, in the cultivation of tobacco, for example, after the flowering period, a so-called centering operation for cutting the upper part of a trunk is performed so that sufficient nutrients are supplied to tobacco leaves. The number of leaves to be harvested is determined by this arresting operation to improve the yield and quality of tobacco leaves.

By the way, if the upper trunk is arrested, "side shoots" are generated from the base of the tobacco leaves and nutrients are consumed there, so that sufficient nutrients cannot be supplied to the tobacco leaves. Therefore, after the cardiac arrest period, the generation of the side bud is suppressed by spraying the side bud inhibitor. Heretofore, a permeation-transfer type sprouts inhibitor sprayed on the leaves of tobacco has been widely used, but in recent years, a contact-type sprouts inhibitor has become mainstream.

[0004] Since the above-mentioned contact-type side bud suppressant does not have the effect of suppressing the side buds unless it adheres to the base of the leaves from which the side buds emerge, it is necessary to spray the agent on the top of the stem and let it flow down along the trunk. is there.

[0005] In the spraying operation of the contact-type side bud suppressant, the worker pulls the lever of the spraying device for each plant in a posture looking up at the stem top from below while walking on the furrow with the spraying device on her back. Spray time of the medicine to perform (spray amount)
Differs for each stock. Furthermore, since the tobacco is sprayed to many tobacco stems in a short period of time, there is a problem that the burden on the operator's hand due to pulling the lever is large.

Therefore, Japanese Patent Publication No. 5-45302 has been proposed as an apparatus for automatically spraying a contact-type side bud inhibitor. According to this, a spraying device (having one chemical spraying port 39 and a pair of series of protective leaflets 40) is provided from the horizontally extending arm 28 of the mobile agricultural machine 1 through a pair of links 32 and 33 downward. A pair of guides 37), and the mobile agricultural machine 1 is run in a state in which tobacco is sandwiched between a pair of leaf protection tubes 40, so that the drug is discharged from the spray port 39 to the lower tobacco trunk. Spray on top of When the tobacco stem is tilted, the pair of links 32 and 33 rotate, and the spraying device, that is, each leaf protection tube 40 follows the tilted tobacco stem. The medicine is displaced in the lateral direction perpendicular to the direction so that the medicine from the spray port 39 is properly sprayed on the top of the tobacco stem.

[0007]

However, since the spraying device must be sequentially moved in the lateral direction in accordance with the inclination of the tobacco stem during the work, it has not been possible to cope with an increase in the speed of the work.

In addition, the tobacco stem followed by the protective tube 40 is not pinched and positioned by any device when the medicine is sprayed. However, there is a problem that it is difficult to cope with the positioning and the spraying accuracy is insufficient.

[0009]

SUMMARY OF THE INVENTION The first aspect of the present invention solves the above-mentioned problems, and the structure of the present invention is as follows. In a medicine dispersing apparatus having a traveling carrier (1) mounted with a medicine dispersing system for transferring a medicine to a medicine dispersing nozzle (8) via a valve (4), the carrier (1) further includes: A rotating body (9, 34) having a detected part (9a, 34a) and rotated in conjunction with an output shaft of a traveling drive engine of a transport vehicle; and a detected part (9a, 34a) of the rotating body. ) To detect the number of rotations or the rotation angle of the rotating body while the carrier moves by a certain distance, and output a detection signal to the controller (5). 36), and a signal from the controller. More by opening the solenoid valve (4), a chemical spraying apparatus for performing chemical spraying from the nozzle (8).

That is, since the rotating body (9, 34) for rotating the detected parts (9a, 34a) is rotated in conjunction with the output shaft of the engine for driving the carrier of the carrier, the carrier is so-called self-propelled. Although it is of a formula, it may be one that travels by a caterpillar or the like without using wheels. The solenoid valve (4) is automatically opened for a certain time every time a certain distance is traveled, and a fixed amount of medicine is sprayed from a nozzle.

According to a second aspect of the present invention, a medicine tank (2)
A traveling carrier (4) mounted with a drug spraying system for transferring a drug to a drug spraying nozzle (8) via a pump (3) and an electromagnetic valve (4) controlled by a controller (5).
In the medicine spraying device having 1), the carrier (41)
A rotating body (44) having a traveling wheel (42) and a detected part (44a) and rotated in conjunction with the rotation of the wheel (42); and a detected part (44a) of the rotating body. ), The rotation number or rotation angle of the rotator during the movement of the carrier by a certain distance, and a sensor (4) for outputting a detection signal to the controller (5).
5), wherein the electromagnetic valve (4) is opened in response to a signal from the controller, and the medicine is sprayed from the nozzle (8).

That is, since the rotating body (44) for rotating the detected part (44a) is rotated in conjunction with the rotation of the wheels (42) of the transport vehicle, when the wheels directly contact the ground and travel. The travel distance can be detected with higher accuracy, and the solenoid valve (4) is automatically opened for a fixed time every time the vehicle travels for a certain distance to spray a fixed amount of medicine from the nozzle.

According to a third aspect of the present invention, there is provided a medicine tank (2) comprising:
A traveling carrier (4) mounted with a drug spraying system for transferring a drug to a drug spraying nozzle (8) via a pump (3) and an electromagnetic valve (4) controlled by a controller (5).
In the medicine spraying device having the above (1), the transport vehicle (1) runs at a constant speed at a constant speed, and the controller (5) outputs a signal every time the transport vehicle travels a predetermined distance. The medicine spraying apparatus is characterized in that the medicine is sprayed from the nozzle (8) by opening the solenoid valve (4).

According to a fourth aspect of the present invention, a medicine tank (2) comprises:
A traveling carrier (4) mounted with a drug spraying system for transferring a drug to a drug spraying nozzle (8) via a pump (3) and an electromagnetic valve (4) controlled by a controller (5).
A medicine spraying method for spraying medicine from the nozzle (8) using 1), the method comprising: (a) setting a pulse number corresponding to a fixed distance to a predetermined set value (2).
2), (b) a step (23) of initializing an added count value of the current number of pulses, and (c) a pulse outputted in accordance with the traveling distance by sequentially detecting the traveling distance of the carrier. (25) sequentially adding signals; and (d) outputting a valve opening signal of the solenoid valve (4) for a predetermined time when the number of added pulses is equal to the number of pulses of the set value. (26, 27), wherein the steps (b) to (d) are repeated at regular intervals.

[0015]

According to the first aspect of the present invention, it is possible to automatically detect that the carrier has traveled for a certain distance and to spray the medicine from the medicine spray nozzle automatically for a certain time. Therefore, the operator only has to guide and position the nozzle near the top of the crop to be sprayed, and the spraying operation of the medicine becomes easy. At this time, since the worker guides the nozzle manually, spraying can be performed reliably.

According to the first aspect of the present invention, the transport vehicle is not limited to running on wheels, but may be any traveling means such as a caterpillar.

In this case, an optical sensor or the like is used as the sensor (11, 36) as the detecting means, and a plurality of uneven portions or through holes or at least one dog is used as the detected portion (9a, 34a) of the rotating body. (34a).

According to the second aspect of the present invention, since the transport vehicle travels on wheels and the traveling distance is directly detected from the wheels, the positioning accuracy of the transport vehicle is high. In this case, the transport vehicle may be a self-propelled type or a hand-held type.

According to the third aspect of the present invention, a sensor for detecting the traveling distance of the transport vehicle is not required.

According to the fourth aspect of the present invention, the circuit configuration is extremely simple because the number of pulses proportional to the traveling distance of the carrier is simply added to determine the coincidence with the set value.

[0021]

FIG. 1 is a perspective view of one embodiment of a medicine spraying apparatus according to the present invention. In FIG. 1, reference numeral 1 denotes a portal-type self-propelled transport vehicle. Pump 3,
The solenoid valve 4 and the controller 5 are mounted, and each member 2,
The hoses 3a and 6b are sequentially connected by hoses 6a and 6b, respectively, and the spray nozzle 8 is connected to the tip of the hose 6c from the solenoid valve 4. Although the operation panel 7 is provided on the controller 5, the operation panel 7 may be provided at the base of the spray nozzle 8 connected to the hose 6c.

Reference numeral 9 denotes a gear-shaped disc having a predetermined number (usually 10 to 50) of concave and convex teeth 9a having a constant pitch.
The vehicle 1 is attached to a power transmission shaft 10 connected to an output shaft (not shown) of an engine for driving the vehicle, and stops when the vehicle 1 stops and rotates when the vehicle 1 moves. The rotation angle or the number of rotations is proportional to the traveling distance of the transport vehicle 1. Reference numeral 11 denotes an optical sensor or a magnetic proximity sensor. The optical sensor or the proximity sensor is disposed opposite to the gear-shaped disk 9 and detects the number of concave or convex teeth of the disk 9 traversing the sensor 11 and travels the carrier 1 as described later. Is detected. In the optical sensor 11, for example, light may be emitted to the convex teeth of the gear-shaped disc 9 to detect the reflected light, or the optical sensor 11 itself may be disposed on both sides of the disc 9 on the light emitting side and the light receiving side. It may be arranged separately to detect light transmitted through the concave portion of the disk 9. In the magnetic proximity sensor 11, the detection is performed using a magnetic field. Then, the convex portion is detected. In using the magnetic proximity sensor 11, for example, the material of the disk 9 is iron, and the convex portion of the disk 9 facing the sensor has a circumferential length of 3 mm.
mm to 10 mm (the length in the axial direction is also substantially the same), and the circumferential length of the concave portion in contact with the convex portion is desirably 5 mm or more.

Further, the sensor 11 is not limited to the optical type and the magnetic type, but may be a microswitch or the like which sequentially contacts the gear teeth of the gear type disk 9 and outputs a signal.

Each of the above members 4 and 11 is connected to the controller 5.

The ridges 12a, 1 parallel to each other in the tobacco field
In 2b, tobacco strains 13a, 13b,... Are planted in rows and at an equal distance A, respectively. Then, for example, the disk 9 corresponding to the distance A between the tobacco strains 13a and 13b
Rotation angle, that is, the disk 9 detected by the sensor 11
Are set in advance by a program in the controller 5. The tobacco strains 13a, 13b... Are not limited to this, and may be any other crops.

FIG. 2 shows an electrical connection between the operation panel 7, the controller 5, and the solenoid valve 4. In the figure, the operation panel 7 has a positioning switch 15 for starting the program and initializing the pulse count, a stop switch 16 for terminating the program, and a pulse number corresponding to the distance A between each strain in the cigarette row. A rotary switch 17 for setting a spraying interval is provided, which is connected to the input side of the controller 5, and the sensor 11 is also connected to the input side of the controller 5. The output side of the controller 5 is connected to the solenoid valve 4.

It is desirable that the rotary switch 17 for setting the spraying interval be of a type that allows fine adjustment of the spraying interval when the spraying operation is actually performed.

FIG. 3 is a flowchart showing the operation of the medicine spraying apparatus of the present invention.

Next, the operation of spraying the medicine, that is, the side bud inhibitor, by the medicine spraying apparatus will be described with reference to the flowchart of FIG.

First, a start button (not shown) on the operation panel 7
To start the program as indicated by step 21 in FIG. Next, as shown in step 22, the number of pulses corresponding to the distance A between the tobacco stocks 13a, 13b... Is selectively set by rotating the spraying interval setting rotary switch 17 of the operation panel 7. Next, the worker operates the transport vehicle 1
Is moved to a predetermined position between the adjacent ridges 12a and 12b, and as shown in step 23, the positioning switch 1
After pressing 5 to initialize the count of the controller 5 and set the predetermined position as the initial position, the user holds the medicine spraying nozzle 8 by hand and guides it above the top of the trunk 13a1 of the first tobacco strain 13a in the tobacco row. .

Thereafter, in step 24, it is determined whether or not the work is completed. If not, the transport vehicle 1 is started to move along the ridges 12a and 12b. Then, since the disk 9 starts rotating, the sensor 11 detects the number of teeth of the disk 9 crossing the disk 9 and inputs this to the controller 5 as a number of pulse signals.

In the controller 5, step 25
As shown by, the number of pulse signals is sequentially counted. Then, as shown in step 26, until the number of pulses reaches a preset value, steps 24-2 in FIG.
6 is repeated. However, when the number of pulses reaches the set value, the process returns to step 23 in FIG.
As shown by, the solenoid valve 8 is energized for a certain time (t) to be opened.

Therefore, the bud suppressant from the chemical tank 2 passes through the solenoid valve 4 from the pump 3 and passes through the chemical spray nozzle 8
, And is discharged from the nozzle 8 positioned above the top of the trunk 13a1 by the operator's hand, and is sprayed on the trunk 13a1. This side bud inhibitor can flow down the stem 13a1 and adhere to the base of tobacco leaves to suppress the generation of side buds.

Next, when the transport vehicle 1 continues to advance and reaches the position of the stem 13b1 of the next tobacco stock 13b, the number of pulses reset to zero and initialized in step 23 again reaches the set value. As in the case described above, the side bud suppressant is discharged from the nozzle 8. In the same manner, the medicine is sprayed from the top of the trunk to each of the other tobacco strains one by one. When the spraying of the tobacco line is finished, the operator operates the operation panel 7.
When the stop switch 16 is pressed, the end of the operation is determined in step 24 in FIG. 3, and the medicine spraying operation is stopped in step 28. Subsequently, the transport vehicle 1 is moved out of the ridges 12a and 12b to start the next ridge.

In the above operation, after the worker positions the nozzle 8 with respect to the first tobacco stock 13a, the carrier moves by the distance A, and the controller 5 outputs a valve opening signal of the solenoid valve 4. However, the present invention is not limited to this, and when the operator presses the start button after first positioning the nozzle 8 with respect to the first tobacco strain 13a, the solenoid valve 4 opens to perform the first spraying of the medicine. In the following, similar to the above case, the solenoid valve 4 may be opened sequentially as the carrier 1 moves.

According to the above-mentioned operation, since the traveling of the transport vehicle 1 is detected at equal intervals A equal to the interval at which the tobacco plants are planted at equal intervals, the medicine is automatically sprayed from the nozzles. The operator only needs to position the nozzle 8 approximately at the position of each tobacco strain, and does not touch and damage the tobacco leaf due to manual operation. In addition, at this time, even if the tobacco trunk is bent from the middle and the distance between the strains at the top of the stem is not uniform, the worker confirms the top of the stem with eyes and easily adjusts the position of the nozzle 8 each time to accurately adjust the position. Since it can be positioned at the stem top, accurate spraying can be performed.

In the above embodiment, the setting of the spraying interval distance A is described in the case where the number of pulses prepared in advance in the program is selected by the rotary switch 17, but the program signal is sent to the controller 5 by an external setting device such as a digital switch. May be input to set an arbitrary number of pulses.

Further, in the above embodiment, the gear teeth of the disk 9 are used to obtain a pulse. However, a plurality of holes having a constant pitch may be provided in the disk and the holes may be detected by the sensor 11. Good.

In the above embodiment, only one spray nozzle 8 is provided, but two or more hoses and nozzles are connected to the solenoid valve 4 as two or more switching valves, and two spray nozzles are connected. As described above, the spraying operation may be performed simultaneously or sequentially.

FIG. 4 shows another embodiment, in which the same parts as those in FIG. 1 are denoted by the same reference numerals. In the drawing, a transport vehicle 31 has a belt 35 wound around a drive pulley 33 coaxial with a power transmission shaft 32 and a driven pulley 34 having at least one dog 34a. The ratio between the diameter of the driving pulley 33 and the diameter of the driven pulley 34 is adjusted so that the driven pulley 34 makes one or more rotations while the transport vehicle 31 travels the inter-stock distance A of the tobacco train. Decide in advance.

Accordingly, when the carrier 31 travels, the driven pulley 34 and its dog 34a rotate via the drive pulley 33 and the belt 35, and the optical sensor 36 attached to the carrier 31 detects the rotating dog 34a. Detect sequentially.
Thus, the controller 5 can detect the travel of the carrier A at the distance A to obtain the timing of spraying the medicine, and each time opens the solenoid valve 4 for a predetermined time.

FIG. 5 shows still another embodiment, in which the same parts as those in FIG. 1 are denoted by the same reference numerals. In each of the above embodiments, the drive shaft (power transmission shaft) interlocked with the output shaft of the engine is used for detecting the traveling distance of the carrier, but in the present embodiment, the wheels that rotate as the carrier 41 moves. 42
Is detected and the medicine is sprayed for each inter-strain distance A of the tobacco line. Further, a disk 44 having gear teeth 44a is coaxially fixed to an axle 43 on which wheels 42 of the transport vehicle 41 are mounted.
Rotate with.

A sensor 45 for detecting the gear teeth 44a is installed near the disk 44. The pulse signal generated by the sensor 45 is counted by the controller 5, and the solenoid valve 4 is turned on for a fixed time for each distance A between the tobacco stocks. Only the valve is opened, and a fixed amount of the medicine is sprayed from the nozzle 8.

In each of the embodiments shown in FIGS. 1, 4 and 5, the travel distance A of the carrier is detected by using the output shaft and wheels of the engine to obtain the timing of spraying the medicine. However, the present invention is not limited to this, and as described below, the solenoid valve may be opened at regular time intervals, and the worker with the nozzle may spray the medicine each time.

That is, if the degree of depression of the accelerator of the engine of the truck during operation is always set to be constant, the traveling speed becomes constant, so that the time required for traveling the inter-strain distance A of the tobacco train naturally becomes constant. Therefore, the setting of the timer is adjusted in accordance with the traveling speed, and the electromagnetic valve is opened for a certain time at each timing when the carrier travels the inter-stock distance A to spray the medicine from the medicine spray nozzle.

[0046]

As described above, the present invention has the following advantages.

Focusing on the fact that a plurality of crops (for example, tobacco) in a row are cultivated at a constant pitch, a signal is output by automatically detecting the traveling distance of the carrier, that is, traveling only by the distance A between crop strains. Therefore, by automatically spraying the medicine from the medicine spray nozzle, the worker only needs to guide and position the nozzle in the vicinity of the top of the crop each time. There is no need for positioning and pulling the nozzle lever for each crop position.
The work is very easy and can speed up the work.

Since the worker manually guides the nozzle to the top of the crop, the medicine can be sprayed reliably and efficiently.

Since the rotating body having the detected portion is only rotated in conjunction with the output shaft of the traveling drive engine of the transport vehicle, the transport vehicle is not limited to running on wheels, and may be driven by any traveling means such as a caterpillar. Good.

In this case, as a detecting means, a sensor (11, 36) such as an optical sensor is used, and at least one concave portion or convex portion (9a) or a through hole or at least one dog is used as a detected portion of the rotating body. (34a).

When the transport vehicle is traveling on wheels, if the traveling distance is directly detected from the wheels, the positioning accuracy of the transport vehicle increases and the work accuracy improves accordingly.
Further, in this case, the transport vehicle may be a self-propelled type or a hand-operated type, and the range of application is wide.

If the traveling time of the distance A between the plant strains is made constant by running the carrier at a constant speed, a sensor for detecting the traveling distance becomes unnecessary, and it is possible to simply obtain the timing of spraying the medicine from the nozzle by a timer or the like. The circuit configuration can be simplified.

As a method of detecting the traveling of the carrier over a certain distance, the number of pulses proportional to the traveling distance is added to determine the coincidence with the set value, and the electromagnetic valve of the medicine is opened for a certain time. Therefore, the circuit configuration is extremely simple.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a medicine spraying apparatus and method according to the present invention.

FIG. 2 is a block diagram showing input and output to and from a controller of the apparatus shown in FIG. 1;

FIG. 3 is a flowchart of a circuit for controlling the apparatus of FIG. 1;

FIG. 4 is a partial perspective view of another embodiment of the device of the present invention.

FIG. 5 is a side view of still another embodiment of the device of the present invention.

[Explanation of symbols]

1, 31, 41 Transport vehicle 2 Drug tank 3 Drug pump 4 Solenoid valve 5 Controller 8 Drug spray nozzle 9, 44 Disk 9a, 44
a Gear teeth (detected parts) 11, 36, 45 Sensors 12a, 1
2b ridge 13a, 13b tobacco strain 13a1,
13b1 Tobacco trunk 15 Positioning switch 16 Stop switch 17 Spray interval setting rotary switch 33, 34
Pulley 34a Dog (detected part) 35 Belt 42 Wheel

Claims (7)

[Claims] 1. A medicine spraying system for transferring a medicine from a medicine tank (2) to a medicine spray nozzle (8) via a pump (3) and an electromagnetic valve (4) controlled by a controller (5). In the medicine dispersing apparatus having the mounted traveling carrier (1), the carrier (1) further has a detected part (9a, 34a) and is connected to an output shaft of a traveling driving engine of the carrier. By detecting the rotation of the rotating body (9, 34) rotated in conjunction with the detected part (9a, 34a) of the rotating body,
A sensor (11, 36) for detecting the number of rotations or the rotation angle of the rotating body while the carrier vehicle moves by a fixed distance, and outputting a detection signal to the controller (5); The medicine spraying device is characterized in that the electromagnetic valve (4) is opened by the signal of (1), and the medicine is sprayed from the nozzle (8). 2. The apparatus according to claim 1, wherein the detected portion (9a) of the rotating body (9) is provided with at least one concave portion or a concave portion provided at a constant pitch in a circumferential direction of the rotating body. A convex portion (9a) or a through hole;
Is an optical sensor for detecting the uneven portion or the through hole. 3. The apparatus according to claim 1, wherein the detected part (9a) of the rotating body (9) is at least one magnetic element provided at a constant pitch in a circumferential direction of the rotating body. The device according to claim 1, wherein the sensor (11) is a proximity sensor that magnetically detects the magnetic concave or convex portion. 4. The apparatus according to claim 1, wherein the detected part (34a) of the rotating body (34) is provided with at least one dog (3) provided at a predetermined angular position of the rotating body.
4a) or a recess or through-hole, wherein said sensor (36) is an optical sensor for detecting said dog or recess or through-hole. 5. A medicine spraying system for transferring a medicine from a medicine tank (2) to a medicine spray nozzle (8) via a pump (3) and an electromagnetic valve (4) controlled by a controller (5). In a medicine spraying device having a traveling transport vehicle (41) mounted thereon, the transport vehicle (41) has a traveling wheel (42), a detected part (44a), and rotates the wheel (42). The rotating body (44) rotated in conjunction with the rotating body, and the detected part (4
A sensor (45) for detecting the number of rotations or the angle of rotation of the rotating body during the movement of the carrier by a fixed distance by detecting the rotational movement of 4a) and outputting a detection signal to the controller (5). ), Wherein the electromagnetic valve (4) is opened according to a signal from the controller, and the medicine is sprayed from the nozzle (8). 6. A medicine spraying system for transferring a medicine from a medicine tank (2) to a medicine spray nozzle (8) via a pump (3) and an electromagnetic valve (4) controlled by a controller (5). In the medicine spraying apparatus having the traveling transport vehicle (41) mounted thereon, the transport vehicle (1) travels at a constant speed at a constant speed, and the controller (5) requires the transport vehicle to travel a constant distance. The solenoid valve (4) outputs a signal at each time.
A drug spraying device which sprays a drug from the nozzle (8) by opening a valve. 7. A medicine spraying system for transferring medicine from a medicine tank (2) to a medicine spray nozzle (8) via a pump (3) and an electromagnetic valve (4) controlled by a controller (5). A medicine spraying method for spraying a medicine from the nozzle (8) using a mounted traveling carrier (41), the method comprising: (a) setting a pulse number corresponding to a predetermined distance to a predetermined set value; (B) a step (23) of initializing an added count value of the current number of pulses; and (c) sequentially detecting the traveling distance of the carrier and corresponding to the traveling distance. (25) successively adding the pulse signals output by the step (d), and (d) opening the solenoid valve (4) for a certain period of time when the number of added pulses is equal to the number of pulses of the set value. Outputting a signal (26) The method 27); and a step of said (b) ~ (d) is characterized in that it is repeated every predetermined distance.