JP2001259493A - Liquid chemical spray device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to automatically control flow rate corresponding to the change of car speed and line stopping or nozzle exchange by improving the control accuracy to uniformalize liquid chemical spraying in a boom sprayer. SOLUTION: In a spray device, in which plural booms 21 each provided with plural nozzle are arranged in the right and left direction of a travelling machine body to form a spray part and the spray work is performed in every booms, a flow rate adjusting means is provided respectively in a spraying passage and a tank return passage, which are formed by branching a discharge port of a pump 25, and is opened and closed by the operation of an actuator and the actuator, a spray width detecting means and a travelling rate sensor are connected to a control means to operate the flow rate adjusting means provided respectively in the spray passage and the tank returning passage only with one actuator 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for appropriately spraying a chemical solution according to a vehicle speed and a spray width of a traveling spraying machine such as a boom sprayer.

[0002]

2. Description of the Related Art Conventionally, a control vehicle equipped with a traveling work vehicle equipped with a chemical solution tank, a power spraying unit, a boom having a nozzle for spraying the chemical solution, and the like are known. When the spraying operation of the chemical liquid is performed by the control vehicle, it is important that the chemical liquid is uniformly sprayed per unit area. However, when working in the same field, when the spray width is changed, the nozzle is changed, or the work speed is changed at the field edge, the spray amount changes, and the same spray amount as before the change is maintained. It was difficult. Then, for example, Japanese Patent Laid-Open No. 6-2248
As described in the issue, the vehicle speed is detected by the speed sensor,
A technique has been disclosed in which a spray amount of a chemical solution is controlled by a pressure sensor and a pressure adjusting valve, and the spray amount is changed in accordance with a traveling speed.

[0003]

However, in general, a pressure regulating valve is operated by an actuator to open and close a valve attached to a spring, but this operation takes time. In other words, “lag in control” occurs, and the spray amount per unit area of the sprayed chemical solution cannot be kept constant.

[0004] When the type of chemical solution is changed or the crop is changed, the nozzle at the end of the boom is changed. This change changes the characteristics of the pressure in the piping path. At this time, since the pressure sensor detects the pressure in the pipe, it is necessary to change the setting of the controller, and the setting change is difficult and time-consuming.

[0005]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, in the spraying device according to the first aspect, a plurality of booms provided with a plurality of nozzles are arranged in the left-right direction of the traveling body to form a spraying unit, and a spraying operation can be performed for each boom. From the spraying path and the tank return path, and flow control means are provided in each of the branched paths.

Further, the flow rate adjusting means is opened and closed by the operation of an actuator, and the actuator and the traveling speed sensor are connected to the control means.

According to a third aspect of the present invention, the flow rate adjusting means provided on each of the spraying path and the tank return path includes one
Activated by one actuator.

[0008]

Next, an embodiment of the present invention will be described. 1 is a side view of a riding traveling work vehicle equipped with a boom player of the present invention, FIG. 2 is a plan view of a riding traveling work vehicle equipped with a boom player, FIG. 3 is a diagram showing a chemical liquid switching valve, and FIG. Is a diagram showing a flow control valve, FIG. 5 is a diagram showing a flow control valve of another embodiment, FIG. 6 is a piping diagram of an embodiment of the present invention, and FIG. 7 is a piping diagram of another embodiment. is there.

In FIG. 1 and FIG. 2, a boom player 1 includes a riding type traveling work vehicle 22, sprayers 35, 35... Disposed in front of the traveling work vehicle 22, It consists of a sprinkling drive section 36 disposed at the rear, and front and rear wheels 7 and rear wheels 8 are provided below and under the chassis frame 6, and on the front of the chassis frame 6, an engine 9 is mounted and a hood 10 is mounted. Cover with the bonnet 10
An operation panel 11 is provided on a rear operation column, and an operation handle 12 is provided on the operation panel 11. A driver's seat 14 is provided behind the operation panel 11, and a lower portion in front of the driver's seat 14 is defined as a step 13. In addition, a hand spraying / car wash switching valve 31 to be described later and a hand spraying / car wash switching button 33 are provided on the step 13 in front of the right side of the driver's seat 14 on the step 13. Further, a controller 2 serving as a control means is built in the operation panel 11, and detection values from a vehicle speed sensor 3, a flow rate sensor 4, and a stop sensor 5 to be described later are input and calculated to be a flow rate adjusting means. It controls the flow control valve 27 and the like. The spray drive unit 36 accommodates a flow rate control valve 27, an actuator 30 described later, a pump 25, and the like in a pump box 26. The output from the engine 9 drives the front wheels 7 and the rear wheels 8, transmits power to a PTO shaft 17 provided at the rear of the fuselage, and drives the spray driving unit 36 from the PTO shaft 17. I have.

Each of the spraying sections 35 comprises a boom 21 and a nozzle for spraying the medicine, and the boom 21 is mounted on the front portion of the chassis frame 6 so as to be able to move up and down in parallel via a lifting link mechanism 37a. The boom 21 includes a front boom 21b disposed in the left and right direction at the front of the fuselage, and side booms 21a and 21c that are foldably extended laterally from both ends of the front boom 21b. , Each boom 2
The chemical liquid switching valves 16a, 16b, 16c for switching the supply of the chemical liquid to the spraying pipes 1a, 21b, 21c are disposed on an operation box 15 provided on the rear side of the operation panel 11.

At both ends of the front boom 21b, the side booms 21a and 21c are rotatably connected. The side booms 21a and 21c can be used for traveling when the medicine spraying operation is not performed. It can be folded and stored along the car 22. In addition, the medicine spraying boom 21 has nozzles 23 for spraying and spraying the medicine.
Is provided.

At the rear of the driver's seat 14, a medicine tank 24 is arranged.
It is installed so as to surround the side and rear of the. further,
A spray drive unit 36 is disposed at the rear of the pump box 2 via a lifting link mechanism 37b.
6. Pump 25, gear case, chamber and safety valve 2
9 and a cock, etc., and a pump 25 via a transmission shaft 18 from a PTO shaft 17 disposed at the rear end of the traveling work vehicle 22.
Is driven. The drug solution suction port of the pump 25 communicates the drug with the drug tank 24 via a pipe 28a. Then, of the chemicals whose pressure has been increased by the pump 25, the chemicals that have passed through the spraying-side flow control valve 27a are sent to the spray cock 19 described later via the pipe 28b and sprayed, while the tank return-side flow control valve 27b is operated. The passed medicine is returned to the chemical tank 24 via the pipe 28e. When the pressure in the pipe between the pump 25 and the flow control valve 27 becomes excessive, a safety valve 29 described later is used.
Accordingly, the excess chemical solution is returned to the chemical solution tank 24 through the pipe 28d, and damage to the adjustment valve and the like due to excessive pressure can be prevented.

Next, the chemical liquid switching valve will be described with reference to FIG. The chemical is supplied from the pump 25 by a pipe 28b.
The water is supplied to the water pipe 20 via the spray cock 19. The diversion pipe 20 has three chemical liquid switching valves 16a, 16b, 16
The discharge ports of the chemical liquid switching valves 16a, 16b, and 16c are connected to the spray pipes provided on the booms 21a, 21b, and 21c, respectively. The chemical liquid switching valve 16a · 1
Lock sensors 5a, 5b, 5c are arranged on 6b, 16c to detect the respective open / closed states, and the lock sensors 5a, 5b, 5c are connected to the controller 2. Further, when the chemical liquid spraying operation is not performed, the supply to the water pipe 20 is stopped by closing the spray cock 19.

Next, the flow rate adjusting mechanism of the present invention will be described with reference to FIGS. FIG. 6 is a diagram illustrating a piping system and a control method of the riding traveling work vehicle equipped with the boom sprayer of the present embodiment. In the present invention, a total of three sensors of the vehicle speed sensor 3, the flow sensor 4, and the stop sensor 5 detect the speed and the spraying state of the traveling work vehicle, and input the values to the controller 2. The controller 2 processes the information and moves the spray-side flow control valve 27a and the return-side flow valve 27b shown in FIG. Set the opening of the valve as follows. Each flow control valve 27 is controlled by the controller 2 by the operation of each actuator 30.
Is executed instantaneously so that control delay does not occur.

The vehicle speed sensor 3 is arranged on a traveling drive system such as an axle of the front wheel 7 or the rear wheel 8 or a drive shaft in a transmission case to detect the number of revolutions. And detects the rotation speed of the shaft of the front wheel 7. The actuator 30 includes a solenoid or the like, and controls opening and closing of the flow control valve 27. For example, when the traveling speed increases, the value of the vehicle speed sensor 3 is input to the controller 2, and the rate of the increase in the speed is calculated and processed. The value of the opening of the valve 27a and the tank return side flow control valve 27b is determined, and the actuator 30a operates in a direction to widen the opening of the spraying side flow control valve 27a, while the actuator 30b operates the opening of the tank return side flow control valve 27b. By acting in a direction to reduce the speed, it automatically responds to the increase in speed and enables even distribution.

Further, in the prior art, since the pressure is distributed and adjusted to the spraying side and the chemical liquid tank returning side via one pressure adjusting valve, the respective flow rates cannot be adjusted independently. For this reason, the amount of the chemical solution returning to the tank affects the amount of the chemical solution on the spraying side, thereby causing a delay in controlling the amount of the chemical solution on the spraying side. However, according to the present invention, since the respective flow rates can be adjusted independently, the control delay as described above does not occur.

When the vehicle body stops, the spray-side flow control valve 27a is completely closed, and the supply of the chemical solution to the boom 21 is cut off. On the other hand, by fully opening the tank return-side flow control valve 27b, the chemical solution is returned to the chemical solution tank 24, so that the pressure in the piping in the piping system does not become high, and the pressure is applied to the pump 25 and the safety valve 29. It does not start. That is, the operation can be performed in a state close to the no-load operation, and the efficiency can be increased.

The flow sensor 4 is installed in the middle of the pipe 28b and detects the amount of the chemical supplied from the pump 25 to the water pipe 20. The controller 2 processes the information detected by the flow sensor 4. By doing so, the controller 2 can recognize the amount of the liquid medicine being sprayed. Further, by processing the information of the flow rate sensor 4 by the controller 2 in accordance with the vehicle speed based on the signal from the vehicle speed sensor 3, compared with the information detection of one system only by the vehicle speed sensor 3, Further, it is possible to control the spraying of the chemical solution with higher accuracy.

Further, by providing the stop sensor 5,
The following problems can be automatically prevented. For example, the supply amount from the pump 25 by using the three boom 21 when I was a chemical liquid sprayed as 0.3 l / m ^2, the chemical liquid amount sprayed from each boom at 0.1 l / m ² is there. When the spray width is reduced near the end of the work in the field,
Chemical switching valve 16a to stop spraying from boom 21a
Switch. At this time, the supply amount from the pump 25 remains at 0.3 l / m ^2, from the boom of the boom 21b · 21c, will be the drug solution sprayed each 0.15 L / m ^2, after Article stop Means that the amount of sprayed chemical per unit area increases. In such a case, the stop sensor 5
The controller 2 adjusts the opening and closing of the flow rate control valve 27 by detecting the number of chemical liquid changeover valves that have been switched. That is, in the above situation, when the switching valve is switched, the opening of the spraying side flow control valve 27a is narrowed so that the supply amount from the pump 25 becomes 0.2 l / m ² , while the tank Return side flow control valve 2
The respective actuators 30 are operated in a direction to widen the opening of 7b.

In the case of spraying on another crop or changing the type of medicine, the nozzle 23 provided on the spraying pipe is used.
If the orifice diameter of the nozzle is changed by replacing 23..., The pressure characteristic in the piping path is changed.
In the case where the pressure sensor and the pressure regulating valve are combined as in the related art, the change in the pressure characteristic causes
23 ... Resetting operation of the controller 2 was necessary at the time of replacement. However, in the control method described in the present invention, since the flow rate in the pipe route is controlled by the flow rate sensor 4, it is only necessary to set the flow rate, and there is no need to detect the pressure in the pipe route. is there.

Next, another embodiment of the present invention will be described with reference to FIG. That is, the spools 27c and 27d for adjusting the opening and closing of the spray-side flow control valve 27a and the tank return-side flow control valve 27b are connected by the connecting body 40, and
0 is connected to the output rod 30d of the actuator 30c. In such a configuration, by moving the actuator 30c up and down in FIG. 5, one valve is operated to open and the other valve is operated to close. This allows one actuator 30c to adjust the flow rate, which simplifies the system as shown in FIG. Also, by the arrangement of the flow control valve,
It can be stored compactly in the pump box 26.

Next, an embodiment in performing hand spraying, car washing, and the like will be described with reference to FIGS. First, the vehicle body is stopped, the engine 9 is raised to the operation speed, and the spray cock 19 shown in FIG. 6 is closed to prevent the chemical solution from flowing to the boom. Next, the hand spraying / car wash switching valve 31 is switched to the hand spraying / car washing side, and a hose 32 for hand spraying or car washing is connected. Next, pressing the manual spraying / car wash switching button 33 shown in FIG. 2 to operate the actuator 30a to open the spraying side flow control valve 27a, while operating the actuator 30b to close the tank return side flow control valve 27b. so,
A chemical solution or water can be spouted from the hose, and hand spraying or car washing can be performed.

[0023]

As described above, according to the present invention, a plurality of booms provided with a plurality of nozzles are arranged in the left-right direction of the traveling body to form a spraying section. In the spraying device that enables the work, the discharge part of the pump branches into a spraying path and a tank return path, and flow control means are provided in each of the branched paths. The amount sprayed on the surface becomes constant, thereby preventing diseases caused by a shortage of chemicals, damage caused by insect pests, and the like.

Also, the flow rate adjusting means is opened and closed by the operation of an actuator, and the actuator and the traveling speed sensor are connected to the control means.
The flow rate can be automatically adjusted, and the amount of the applied chemical solution can be adjusted with high accuracy.

According to a third aspect of the present invention, the flow rate adjusting means provided in each of the spraying path and the tank return path includes one
By operating with two actuators, the system for controlling the flow rate of the chemical solution can be simplified, the configuration can be simplified, the device can be compactly arranged, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view of a riding work vehicle equipped with a boom player according to the present invention.

FIG. 2 is a plan view of a riding traveling work vehicle equipped with the boom player of the present invention.

FIG. 3 is a diagram showing a chemical liquid switching valve.

FIG. 4 is a diagram showing a flow control valve.

FIG. 5 is a view showing a flow control valve of another embodiment.

FIG. 6 is a piping diagram of an embodiment of the present invention.

FIG. 7 is a piping system diagram of another embodiment.

[Explanation of symbols]

 2 Controller 3 Vehicle speed sensor 4 Flow rate sensor 5 Stop sensor 11 Operation panel 16 Chemical solution switching valve 21 Boom 23 Switch nozzle 27a Spray side flow rate adjustment valve 27b Tank return side flow rate adjustment valve 28 Pipe 29 Safety valve 30 Actuator 33 Hand spraying / car wash switching button

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2B121 CB03 CB24 CB33 CB42 CB47 CB51 CB53 CB61 EA24 EA25 FA04 FA11 4D074 AA05 BB06 CC04 CC39 CC54 CC60

Claims (3)

[Claims] 1. A spraying device that arranges a plurality of booms provided with a plurality of nozzles in the left-right direction of a traveling body to form a spraying section and enables spraying work for each boom. A chemical liquid spraying device characterized by branching into return paths and providing flow rate adjusting means in each of the branched paths. 2. The chemical spray device according to claim 1, wherein the flow rate adjusting means is opened and closed by the operation of an actuator, and the actuator and the traveling speed sensor are connected to a control means. 3. The chemical spray device according to claim 1, wherein the flow rate adjusting means provided in each of the spraying path and the tank return path is operated by one actuator.