JP3752753B2 - Liquid spreader - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cleaning device for a liquid spreader, and is for cleaning each part in a hydraulic circuit after spraying liquid, such as a fertilizer application device and a chemical solution spraying device, with cleaning water.
[0002]
[Problems to be solved by the invention]
Since the liquid spreader sprays chemicals, liquid fertilizer, etc., it is highly acidic, and after spraying work, wash the sprayer with washing water to prevent corrosion during storage of the spreader. Yes. However, since the chemical solution and the like in the hydraulic circuit of the spreader are completely cleaned, it is unclear to what extent cleaning can be continued, and it is difficult to perform efficient cleaning.
[0003]
[Means for Solving the Problems]
This invention has a hydraulic circuit (2) for spraying and spraying the liquid discharged by driving the pump (P) from the nozzle (1) at the tip, and washing water is supplied to the hydraulic circuit (2) after the spraying is finished. A cleaning mode switch (SW1) for discharging and cleaning is provided, and a plurality of solenoid valves (V1) provided to be opened and closed for each nozzle block of the hydraulic circuit (2) in accordance with the operation of the cleaning mode switch ( SW1 ). ˜V4) in a liquid spreader provided with a cleaning control device (CPU) that controls to repeat a suitable number of times (N) while opening and closing each time constant (t) sequentially , the pump (P) and the hydraulic circuit (2) It is set as the structure of the liquid spreader made into the structure which stops the washing | cleaning of a hydraulic circuit (2), when the residual medicine sensor (3) which detects the residual medicine in the inside stops detecting a chemical | medical solution .
[0004]
【The invention's effect】
By driving the pump P, the chemical solution is sprayed by the liquid spreader. The liquid discharged from the pump P is sprayed from the nozzle 1 at the tip through the hydraulic circuit 2. When this chemical solution spraying operation is finished, the number of times of cleaning N and the opening times t of the electromagnetic valves V1 to V4 are set by SW5, the cleaning mode switch SW1 is turned ON, and the cleaning water is sucked in by the pump P and the hydraulic pressure is increased. By spraying from the nozzle 1 while discharging into the circuit 2, the inside of the hydraulic circuit 2 is cleaned.
[0005]
Each electromagnetic valve V1 is opened for a certain time t, and is washed through the hydraulic circuit 2 and ejected from the nozzle block of the electromagnetic valve V1. After the certain time t has elapsed, the electromagnetic valve V1 is closed and The electromagnetic valve V2 in the stroke is opened and ejected from the nozzle block for a predetermined time t. Such an operation is sequentially repeated with the electromagnetic valves V3 and V4, and when the first cleaning is completed, the second cleaning operation is subsequently performed over a set number of times N.
[0006]
For this reason, the cleaning effect can be enhanced by intermittently cleaning the solenoid valves V1 to V4 and the nozzle 1 as well as the inside of the hydraulic circuit 2. Moreover, since the cleaning control can be performed by setting operations such as the cleaning time and the number of intermittent cleanings and the operation of the cleaning mode switch SW1, the operation can be easily facilitated.
Further, when the remaining medicine sensor 3 does not detect the remaining medicine in the pump P or the hydraulic circuit 2, the solenoid valves V1 to V4 are closed and the cleaning action can be stopped.
[0007]
【Example】
A mode in which a chemical solution spreader is attached to the tractor vehicle body 4 and the chemical solution is sprayed on the soil surface or crops will be described. The vehicle body 4 has front wheels 6 and rear wheels 7 that can be steered by the steering handle 5, and can travel by being driven by transmission to an engine mounted under the front bonnet 8. Reference numeral 9 denotes a cockpit, which is provided between the left and right fenders 10, and a safety frame 12 having a roof 11 is provided above this.
[0008]
The liquid spreader is attached to the rear portion of the vehicle body 4 and is supported by a three-point link mechanism 13 such as a lower link or a top link that is moved up and down by a lift arm. A work frame 14 mounted on the three-point link mechanism 13 is provided with a tank 15 for storing liquid, a pump P for sucking liquid from the tank 15 and discharging it to the hydraulic circuit 2, and further, On the side, an up-and-down pivotable arm 17 is provided, a nozzle pipe 18 in the horizontal direction is attached to the tip, and the spray nozzles 1 are arranged along the nozzle pipe 18. Also, such nozzle pipes 18 are divided into a plurality of parts in the lateral direction. A nozzle cover 19 is provided above each nozzle pipe 18.
[0009]
By driving the pump P by the PTO shaft 16 of the vehicle body 4, the chemical liquid in the tank 15 is discharged through the filter 20 to the pressure regulating valve 21 side of the hydraulic pressure circuit 2, and the pressure regulating tank 21 delivers the pressure regulating tank. It sends out to 22 side, distributes to each nozzle pipe 18, and sprays it toward the downward direction from the nozzle 1. FIG. The excess liquid set by the pressure regulating valve 21 is returned into the tank 15 through the return pipe 23.
[0010]
The pump P is a plunger type pump, and the plunger 25 is reciprocated in the cylinder 26 by the rotation of the crankshaft 24, and the liquid sucked from the suction port 27 is discharged to the discharge chamber 28, and the hydraulic circuit 2. Pump to the side. Check valves 29 and 30 are provided on the suction port 27 side and the discharge chamber 28 side of the cylinder 26. The remaining medicine sensor 3 is provided in the discharge chamber 28.
[0011]
The remaining medicine sensor 3 detects the nature of the chemical solution in the wash water sucked into the pump P. For example, the residual drug solution in the wash water is detected by detecting the pH (hydrogen ion concentration) of the wash water. It is configured as possible. This remaining medicine sensor 3 may be provided in the middle of the hydraulic circuit 2 other than the pump P, or may be provided in an unend portion of the nozzle pipe 18 or the like.
[0012]
The sprayer cleaning control device CPU has a microcomputer. On the input side, a cleaning mode switch SW1 for performing automatic cleaning control, a number of times switch SW3 for setting the number N of opening of each solenoid valve V1 to V4, There are provided a time setting switch SW5 for setting the opening time t for each time of the solenoid valves V1 to V4, a water amount switch SW4 for setting the spray amount of the solenoid valves V1 to V4, or the amount of cleaning water. In addition to this, a remaining medicine sensor 3 is provided, and an operation switch SW2 and the like that can detect remaining medicine in the pump P and the hydraulic circuit 2 and perform washing by manual operation are provided.
[0013]
When cleaning is performed by the cleaning controller CPU, the chemical solution in the tank 15 is discharged and cleaning water is supplied, or the pump P is driven by inserting the water inlet of the pump P into another cleaning tank or the like. At the same time, the cleaning mode switch SW1 is turned on. Wash water sucked by the pump P is ejected from the nozzle 1 of each nozzle pipe 18 through the hydraulic circuit 2. At this time, the solenoid valves V1 to V4 of the nozzle pipes 18 are not opened at the same time as shown in the flowchart in the figure, but for each single solenoid valve in order of V1 → V2 → V3 → V4 every unit time (t = 10 seconds). The nozzle is sprayed from the nozzle 1 of each nozzle pipe 18 to wash out and discharge the remaining chemical solution in the hydraulic circuit 2. Such sequential opening and closing of the solenoid valves V1 to V4 is repeated over the set number N. As a result, the automatic cleaning control is stopped.
[0014]
In this way, when the remaining medicine sensor 3 does not detect the chemical (the PH sensor detects neutrality), the solenoid valves V1 to V4 may be closed to stop the cleaning action. 4 and 5, the difference from the above example is that a flow meter 32 for detecting the amount of residual water is provided in the return pipe 23 connected to the tank 15 from the pressure regulating valve 21. The actual spray amount from the nozzle 1 is calculated, the actual spray amount is compared with the set spray amount set by the water amount switch SW4, and the calculation result exceeds a specified range (± 10%). In this case, feedback control is performed so as to correct the spraying amount by increasing or decreasing the open time t of the electromagnetic valves V1 to V4. 31 is a vehicle speed sensor, and 33 is a driver for adjusting the open time length of the predetermined time t.
[0015]
In FIG. 6, the difference from the above example is that the nozzle hole 34 of the liquid master nozzle 1 for soil disinfection is formed in a spiral shape, and the diameter gradually decreases from the base A end surface to the tip B surface. By forming in this way, the spray area D is made deeper in the soil surface G so as not to scatter the jet flow C of liquid ejected from the nozzle hole 34.
[Brief description of the drawings]
FIG. 1 is a piping diagram of a liquid spreader.
FIG. 2 is a block diagram of a cleaning control device and a control flowchart thereof.
FIG. 3 is a side view of a tractor spreader.
FIG. 4 is a piping diagram of a liquid master showing another embodiment.
FIG. 5 is a block diagram showing a partially different embodiment and a control flowchart thereof.
FIG. 6 is a cross-sectional view and an action diagram of a nozzle for a liquid master that injects liquid manure into the dredged soil surface.
FIG. 7 is a side view of a hydraulic pump unit.
[Explanation of symbols]
1 Nozzle 2 Hydraulic circuit
3 Residual drug sensor
P Pump SW1 Cleaning mode switch V1 to V4 Solenoid valve t Fixed time N Number of times

Claims (1)

It has a hydraulic circuit (2) for spraying and spraying the liquid discharged by driving the pump (P) from the nozzle (1) at the tip, and washing is performed by discharging cleaning water to the hydraulic circuit (2) after the spraying is completed. A cleaning mode switch (SW1) is provided, and a plurality of solenoid valves (V1 to V4) provided to be opened and closed for each nozzle block of the hydraulic circuit (2) in accordance with the operation of the cleaning mode switch ( SW1 ). In a liquid spreader provided with a cleaning control device (CPU) for controlling to repeat an appropriate number of times (N) while opening and closing sequentially every certain time (t ), the remaining medicine in the pump (P) and the hydraulic circuit (2) A liquid sprayer configured to stop the cleaning of the hydraulic circuit (2) when the remaining medicine sensor (3) for detecting the liquid stops detecting the chemical liquid .

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