JP2002119899A - Spray device for liquid chemical spraying car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an inexpensive spray device for a liquid chemical spraying car by dispensing with a pressure device or a pressure sensor or the like in a spray line. SOLUTION: In the liquid chemical spraying car having a spray line 4 for sending liquid to a nozzle boom 3, in which a spray nozzle 2 is arranged, by driving a pump 1 and performing spray control corresponding to the speed of the car, a stirring line 6 for stirring the liquid chemical by returning a part of the liquid chemical to a liquid chemical tank 5, a flow control line 8 for discharging the excess liquid by having a flow control valve 7 for controlling the flow rate to the nozzle boom 3 and a spray flow rate sensor 9 for detecting the flow rate to the nozzle boom 3 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spraying device for a chemical spraying vehicle, which automatically adjusts a chemical spraying amount according to a vehicle speed to perform uniform spraying.

[0002]

2. Description of the Related Art In the form of a spraying device for spraying a medicine in accordance with a vehicle speed, a pressure adjusting device for adjusting a spraying pressure in a spraying circuit and a pressure sensor for detecting the pressure are often provided.

[0003]

In such a form in which a pressure device or equipment is provided, the production cost is expensive and the liquid pressure in the spray circuit is kept high, so that it is necessary to increase the pressure resistance. Not economical.

[0004]

According to the first aspect of the present invention, there is provided a spray circuit 4 for feeding a liquid to a nozzle boom 3 provided with a spray nozzle 2 by driving a pump 1 to perform spray control according to a vehicle speed. In the chemical sprayer, the spray circuit 4 includes a stirring circuit 6 for reducing the chemical liquid to a part of the chemical tank 5 and stirring the chemical, and a flow control valve 7 for adjusting the flow rate to the nozzle boom 3 so that the surplus liquid is removed. The configuration of the spray device is provided with a flow rate adjusting circuit 8 for discharging and a spray flow rate sensor 9 for detecting a flow rate to the nozzle boom 3.

The invention according to claim 2 is characterized in that a spray area sensor 10 for detecting a spray area of the nozzle boom 3 is provided. According to a third aspect of the present invention, the reduction flow rate sensor 11 detects the reduction flow rate in the stirring circuit 6.
And calculating the spray flow rate at the nozzle boom 3.

According to a fourth aspect of the present invention, the stirring circuit 6
Is provided with a reduction flow rate sensor 11 and an excess flow rate sensor 12 for detecting the excess flow rate in the flow rate adjustment circuit 8 to calculate the spray flow rate in the nozzle boom 3.

[0007]

When the pump 1 is driven, the chemical in the chemical tank 5 is sent to the spray circuit 4 and sprayed from the nozzles 2 of each nozzle boom 3. At this time, the flow rate of the chemical solution fed to the nozzle boom 3 is detected by the spray flow rate sensor 9. The chemical liquid in the spray circuit 4 is partially reduced to the chemical liquid tank 5 through the stirring circuit 6, and the reduced liquid jet stirs and mixes the chemical liquid in the tank 5 to maintain a uniform concentration.

In the flow control circuit 8, the flow control valve 7 is controlled to open and close so that the spray amount of the chemical from the nozzle 2 is controlled to an outflow amount according to the vehicle speed. That is, when the vehicle speed rises from the reference range, the flow control valve 7 is throttled to increase the flow rate to the nozzle boom 3, and conversely, when the vehicle speed decreases, the flow control valve 7 is opened and the flow rate to the nozzle boom 3 increases. Is controlled so that the chemical spray amount per traveling distance of the chemical sprayer is kept constant.

Such chemical spray control is performed based on program control in a control device. The flow rate to each nozzle boom 3 is detected by the spray flow rate sensor 9 and the flow rate control valve 7 is feedback-controlled.

[0010]

According to the first aspect of the present invention, the flow rate control valve 7 is actuated while detecting the flow rate of the nozzle boom 3 to the spray circuit 4 by the spray flow rate sensor 9 to thereby adjust the spray flow rate according to the vehicle speed. Since control is performed, a simple and inexpensive configuration can be achieved without the need for a pressure device or a pressure sensor.

According to the second aspect of the present invention, the opening of the flow control valve 7 is adjusted and controlled while the spray area sensor 10 detects the area of spraying the chemical solution by the nozzle 2 and the nozzle boom 3 for spraying. In addition, it is possible to maintain and control the spray flow rate according to the spray application area.

According to the third aspect of the present invention, the reduction flow rate of the stirring circuit 6 and the nozzle boom 3 are detected by detecting the flow rate of the chemical solution reduced toward the chemical solution tank 5 by the reduction flow rate sensor 11. By previously setting the ratio to the spray flow rate, the spray flow rate at the nozzle boom 3 can be calculated. The flow control valve 7 can be feedback-controlled based on the calculated spray flow rate.

In this embodiment, when the liquid supply to any of the spray nozzles 2 to 3 is stopped to change the spray area, the flow rate ratio between the stirring circuit 6 and the nozzle boom 3 due to this change is changed. By setting the form in advance,
Spray control can be performed while calculating an accurate flow rate.

According to the fourth aspect of the present invention, the reduction flow rate of the stirring circuit 6 is detected by the reduction flow rate sensor 11 and
Detecting the discharge flow rate of the nozzle boom 3 by detecting the discharge flow rate of the flow rate adjusting circuit 8 by the surplus flow rate sensor 12 and subtracting these detected flow rates from the discharge rate of the pump 1 to the spray circuit 4. Can be.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention can be embodied as a spraying device for a chemical sprayer such as a boom sprayer. An outline of the configuration of this chemical sprayer will be described with reference to the drawings. The vehicle body 13 has a pair of left and right front wheels 14 and a rear wheel 15, and is mounted on a hood 16.
7, and can be driven. Steering post 1
By operating the handle 19 on the front and rear wheels 8, 1
5 can be steered. The liquid medicine tank 5 having a concave shape in plan view is mounted so as to surround the periphery of the driver's seat 20 at the rear of the vehicle body 13. A pump 1 is provided below the driver's seat 20 for sucking the chemical in the chemical tank 5 and sending it to a spray circuit 4 having a nozzle boom 3 and the like. A nozzle boom 3 on which the spray nozzle 2 is arranged is mounted on a front end of the vehicle body 13 via a lift hitch 23 having a lift cylinder 22 which is extended and retracted by a geared motor 21 so as to be able to move up and down.

On the side of the driver's seat 20, a spray circuit unit 24 constituting the spray circuit 4 is arranged. The spray circuit 4 includes a spray flow rate sensor 9 for detecting the flow rate of the chemical solution to the air chamber 28 and the nozzle boom 3, and a flow rate as an actuator for discharging the chemical solution to the outside and controlling the flow rate to the nozzle boom 3. It has a control valve 7 and the like. The spray circuit unit 24 is connected to the pump 1 by a discharge pipe 25, is connected to a stirring nozzle 26 in the chemical solution tank 5 by a stirring circuit 6 formed of a pipe, and is configured to discharge excess liquid in the spray circuit 4. A flow rate adjusting circuit 8 composed of a pipe for returning to the chemical liquid tank 5 is connected. Further, the nozzle boom 3 is connected to the nozzle boom 3 by a boom circuit 27 composed of a hose.

Here, based on FIG. 1 to FIG. 5, the invention according to claim 1 is based on the
In a chemical spraying vehicle having a spray circuit 4 for feeding a liquid to the nozzle boom 3 arranged and performing a spray control in accordance with a vehicle speed, a stirring circuit for reducing a part of the spray circuit 4 to a chemical tank 5 and stirring the chemical. 6, a flow rate adjusting circuit 8 having a flow rate adjusting valve 7 for adjusting the flow rate to the nozzle boom 3 to discharge excess liquid, and a spray flow rate sensor 9 for detecting the flow rate to the nozzle boom 3 are provided. This is a configuration of a spray device characterized by the above.

The pump 1 drives the chemical tank 5
Is sent to the spray circuit 4 and sprayed from the nozzles 2 of each nozzle boom 3. At this time, the flow rate of the chemical solution fed to the nozzle boom 3 is detected by the spray flow rate sensor 9. The chemical in the spray circuit 4 is partially reduced to the chemical tank 5 through the stirring circuit 6, and the reduced jet flows into the tank 5
The chemicals in the mixture are stirred and mixed.

In the flow control circuit 8, the flow control valve 7 is controlled to open and close so that the spray amount of the chemical solution from the spray nozzle 2 is controlled to be a spray amount corresponding to the vehicle speed. That is, when the vehicle speed rises from the reference range, the flow control valve 7 is throttled to increase the flow rate to the nozzle boom 3, and conversely, when the vehicle speed decreases, the flow control valve 7 is opened and the flow rate to the nozzle boom 3 increases. Is controlled so that the chemical spray amount per traveling distance of the chemical sprayer is kept constant.

Such chemical spray control is performed based on program control in the control device. The flow rate to each nozzle boom 3 is detected by the spray flow rate sensor 9 and the flow rate control valve 7 is feedback-controlled. For this reason, the flow rate control valve 7 is operated while detecting the flow rate to the spray circuit 4 to the nozzle boom 3 by the spray flow rate sensor 9 to control the spray flow rate according to the vehicle speed. Since a pressure sensor is not required, a simple and inexpensive configuration can be achieved.

Further, the invention according to claim 2 is characterized in that a spray area sensor 10 for detecting a spray area of the nozzle boom 3 is provided. It is possible to maintain and control the spray flow rate according to the spray spray area by adjusting and controlling the opening of the flow rate control valve 7 while detecting the area of spraying the chemical solution by the nozzle boom 3.

A water supply pipe 31 that can supply water from a water tank (not shown) is connected to a supply pipe 30 connected to a liquid supply port 29 of the chemical liquid tank 5, and a pump 1
And a filter 32 for filtering the liquid supplied to the filter. Also, at the connection between the water supply pipe 31 and the supply pipe 3,
A switching cock 33 is provided to supply water from the water supply pipe 31 to the supply pipe 30 or to supply water from the liquid supply port 29 to the supply pipe 3.
0 can be switched to supply the chemical solution.

Further, the stirring circuit 6 can reduce and inject a part of the chemical solution of the spray circuit 4 from the stirring nozzle 26 into the chemical solution tank 5 to agitate the chemical in the chemical solution tank 5. The flow control valve 7 of the flow control circuit 8 is electronically opened and closed by an output from the spray control controller 34. The flow rate sensor 9 detects the spray flow rate of the chemical solution flowing to the nozzle boom 3, and the controller 34
Then, the flow control valve 7 is controlled while comparing with a reference spray flow rate previously set by the spray amount setting device 35.

The nozzle boom 3 is a Centaboom 3C
And left and right side booms 3L and 3R.
The centric boom 3 </ b> C is arranged at the center of the front of the vehicle body width, and is fixed to the lift hitch 23. The left and right side booms 3L and 3R are foldably attached to both ends of the centric boom 3C, and can be switched between a spreading posture expanded in the horizontal horizontal direction and a storage posture folded rearward and upward. . The boom circuit 27 is branched from the spray circuit 4, and each of the centric booms 3C, the side booms 3L, 3
Each R is connected separately.

These booms 3C, 3L, 3R can be set so that the spray flow rates are the same by, for example, setting the number of spray nozzles 2 to be the same and making them approximately the same length. Boom circuits 27C, 2 of each boom 3C, 3L, 3R
The cocks 36C, 36L, 36R are provided in the 7L, 27R, and can be sprayed or stopped for each of the booms 3C, 3L, 3R.
By detecting at 10L and 10R, the width of spraying in the running width of the vehicle body 13 can be detected as the spray area.

For example, when spraying is to be performed by the centaboom 3C and the right side boom 3R, the left cock 36L is closed. During spraying, the left spray area sensor 10L does not detect the flow rate.
Is input to

The vehicle speed of the vehicle body 13 is detected by a vehicle speed sensor and input to the controller 34. The flow control valve 7 is opened and closed according to the vehicle speed. The control program such as the control flow curve and the flowchart is set by the controller 34. In this manner, the spray amount is set by the setting device 35 and the spray area is determined by the cock 36, so that the spray control is automatically performed by the spray circuit 4.

Next, referring mainly to FIG.
The invention described in (1) is characterized in that a reduction flow rate sensor 11 for detecting a reduction flow rate is provided in the stirring circuit 6 to calculate a spray flow rate in the nozzle boom 3. By detecting the flow rate of the chemical solution reduced toward the target by the reduction flow rate sensor 11, the ratio between the reduction flow rate of the stirring circuit 6 and the spray flow rate of the nozzle boom 3 is set in advance, so that the nozzle boom 3 The spray flow rate can be calculated. The flow rate control valve 7 can be feedback-controlled based on the calculated spray flow rate and the reference spray flow rate already set by the ejection amount setting device 35.

In this embodiment, when the liquid supply to any of the spray nozzles 2 to 3 is stopped to change the spray area, the flow rate ratio between the stirring circuit 6 and the nozzle boom 3 due to this change is changed. By setting the form in advance,
Spray control can be performed while calculating an accurate flow rate.

Here, the agitating circuit 6 of the spraying circuit 4 is provided to be branched into two paths 6A and 6B on the way. The reduction flow sensor 11 is provided on one of the paths 6B. This passage 6B can be configured to have the same flow rate as the nozzle booms 3C, 3L, 3R. In this case, the spray flow rate at the nozzle boom 3 is
Can be calculated as an integral multiple of the detection amount of

Further, based mainly on FIGS. 7 and 8, the invention according to claim 4 is characterized in that the agitating circuit 6 is provided with a reducing flow rate sensor 11 and the flow rate adjusting circuit 8 is configured to detect an excess flow rate. The flow rate sensor 12 is provided to calculate the spray flow rate in the nozzle boom 3. The reduction flow rate sensor 11 detects the reduction flow rate Qa of the stirring circuit 6, and the excess flow rate sensor 12 controls the flow rate adjustment circuit 8. By detecting the discharge flow rate Qb of these pumps, these detected flow rates Qa and Qb are determined in advance by the pump 1 having a predetermined drive speed.
By subtracting from the discharge amount Qc discharged to the spray circuit 4 by the above, the spray flow rate Q to the nozzle boom 3 is
It can be calculated as an equation (Q = Qc-Qa-Qb).

Referring mainly to FIG. 9, an electronic display 39 is arranged on a meter panel 38 provided above the steering post 18, and a spray amount setting device around which a spray amount of the chemical in the spray circuit 4 is set. 35, a discharge amount setting device 41 for setting a discharge amount of the chemical solution by the pump 1, and a changeover switch 4 for switching between a case where the chemical solution is sprayed automatically as described above and a case where the chemical solution is sprayed manually.
0, increase / decrease switches 42 and 43 for increasing / decreasing the set amount by the spray amount setting device 35, a reset switch 44, a changeover switch 45 for switching the display data on the display 39, a correction switch 46, and the like. The situation and the like can be accurately recognized or confirmed.

Referring mainly to FIG. 10, points different from the above example will be described. Instead of detecting the vehicle speed by the vehicle speed sensor 37, the vehicle speed is calculated based on the rotation speed of the engine 17 and the shift position in the transmission. For this purpose, an engine tachometer 47 for detecting the rotation of the engine 17 and shift position sensors 50 and 51 comprising potentiometers for detecting the shift positions of the sub shift lever 48 and the main shift lever 49 are provided, and the reduction ratio of each shift position is previously determined. Are registered in the controller 34, and these engine rotation, reduction ratio, wheel tire diameter, slip ratio, etc.
Formula (vehicle speed) = (engine speed) × (reduction ratio) × (tire diameter) × (π) × (slip ratio) The vehicle speed can be calculated.

Since the vehicle speed can be detected based on the engine speed and the shift position, the hydraulic pressure can be applied to the spray circuit 4 even when the vehicle is stopped with the clutch disengaged, and the chemical spray can be performed when the vehicle is stopped. In addition, it can be started and sprayed as it is. That is, in general, in the method of calculating the vehicle speed from the value detected by the vehicle speed sensor, if the output value of the vehicle speed sensor is 0 while the vehicle is stopped, spraying of the chemical cannot be performed. By calculating from the rotation speed and the reduction ratio of the engine, the chemical spray can be performed even when the vehicle body is stopped as long as the engine is rotating.

Referring mainly to FIG. 11, points different from the above example will be described. Switches 52, which are turned on and off, have shift position sensors 50, 51 for detecting shift positions by the shift levers 48, 49, which include an actuator made of a leaf spring material that is operated by the contact of the levers 50, 51. 53 are provided.

The calculation of the vehicle speed is almost the same as in the above example, but since the slip ratio and the tire diameter are different between the paddy field and the field, it is necessary to set an arithmetic expression for each change of these conditions. Can be.

[Brief description of the drawings]

FIG. 1 is a diagram of a chemical spray circuit.

FIG. 2 is a side view of the chemical sprayer.

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

FIG. 4 is a plan view of the chemical sprayer.

FIG. 5 is a block diagram of the spray control device.

FIG. 6 is a chemical spray circuit diagram showing another embodiment of the present invention.

FIG. 7 is a chemical spray circuit diagram showing another embodiment of the present invention.

FIG. 8 is a chemical spray circuit diagram showing another embodiment of the present invention.

FIG. 9 is a plan view of a meter panel unit.

FIG. 10 is a block diagram of a vehicle speed detection unit showing a partially different embodiment.

FIG. 11 is a plan view of a speed change lever portion showing a partially different embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump 2 Spray nozzle 3 Nozzle boom 4 Spray circuit 5 Chemical tank 6 Stirring circuit 7 Flow control valve 8 Flow control circuit 9 Spray flow sensor 10 Spray area sensor 11 Reduction flow sensor 12 Excess flow sensor

Continued on the front page F term (reference) 2B121 CB03 CB24 CB33 CB62 FA04 FA11 FA14 4D074 AA05 BB06 CC04 CC22 CC37 CC39 CC45 CC56 CC57 FF11 FF12

Claims (4)

[Claims] 1. A chemical spraying vehicle having a spray circuit 4 for feeding a liquid to a nozzle boom 3 provided with a spray nozzle 2 by driving a pump 1 and performing spray control according to a vehicle speed.
A stirring circuit 6 for partially reducing the chemical solution to the chemical solution tank 5 and agitating the chemical solution; a flow rate adjusting circuit 8 having a flow rate adjusting valve 7 for adjusting the flow rate to the nozzle boom 3 to discharge the excess liquid; Spray flow rate sensor 9 for detecting the flow rate to nozzle boom 3
And a spraying device. 2. The spraying device for a chemical sprayer according to claim 1, further comprising a spray area sensor for detecting a spray area of the nozzle boom. 3. The medicine spraying vehicle according to claim 1, wherein a reduction flow rate sensor for detecting a reduction flow rate is provided in the stirring circuit, and a spray flow rate in the nozzle boom is calculated. Spraying equipment. 4. The reduction flow sensor 11 is provided in the stirring circuit 6.
And a flow rate adjusting circuit 8 is provided with an excess flow rate sensor 12 for detecting an excess flow rate, and calculates a spray flow rate in the nozzle boom 3.
Or the spraying apparatus of the chemical spraying vehicle of Claim 3.