JPH10156241A - Washing device for liquid spreading apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently wash the inside of a liquid pressure circuit after spreading liquid chemicals in a liquid spreading machine. SOLUTION: In the liquid spreading apparatus having a liquid pressure circuit 2 in which liquid discharged by driving of a pump P is ejected and spread from a nozzle 1 of the tip, the washing device is constituted by providing a washing mode switch SW1 by which after spreading is finished, washing water is discharged to the liquid pressure circuit 2 to perform washing, and providing a plurality of solenoid valves V1-V4 and a washing control device CPU. The solenoid valves V1-V4 are provided so that spout and opening/closing are performed at every nozzle block of the liquid pressure circuit 2. The washing control device CPU controls the respective solenoid valves V1-V4 so that while these valves are successively opened and closed at every constant time (t), this operation is repeated at suitable number N of times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning device for a liquid sprayer, and more particularly to a device for spraying a liquid, such as a fertilizer or a chemical sprayer, in a hydraulic circuit after the liquid has been sprayed.

[0002]

Since the liquid sprayer sprays a chemical solution, liquid fertilizer and the like, the liquid sprayer is strongly acidic.
The spreader is prevented from getting rotten during storage. However, since the chemicals and the like in the hydraulic circuit of the sprayer are completely washed, it is unclear how much cleaning can be continued, and it is difficult to perform efficient washing.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a liquid spraying machine having a hydraulic circuit 2 having a hydraulic circuit 2 for spraying and discharging a liquid discharged by driving a pump P from a nozzle 1 at a front end thereof. A cleaning mode switch SW1 for discharging cleaning water to the cleaning circuit 2; and a plurality of solenoid valves V provided to open and close the nozzles of each of the nozzle blocks of the hydraulic circuit 2.
1 to V4, and a cleaning control unit CPU for controlling the solenoid valves V1 to V4 to be opened and closed sequentially at regular time intervals t and repeated N times an appropriate number of times.

[0004]

The chemical spraying by the liquid sprayer is performed by driving the pump P. The liquid discharged from the pump P is sprayed from the nozzle 1 at the tip through the hydraulic circuit 2. When the chemical spraying operation is completed, the number of washings N, the opening time t of each of the solenoid valves V1 to V4, etc. are set by SW5, the washing mode switch SW1 is turned on, and the washing water is sucked by the pump P and the hydraulic pressure By spraying from the nozzle 1 while discharging into the circuit 2, the inside of the hydraulic circuit 2 is cleaned.

[0005] Each solenoid valve V1 is opened for a certain period of time t, is ejected from the nozzle block of this solenoid valve V1 through the hydraulic circuit 2 to perform water washing, and closes the solenoid valve V1 after the lapse of this certain period of time t. At the same time, the solenoid valve V2 in the next stroke is opened and ejected from this nozzle block for a certain time t. Such an operation is sequentially repeated with the solenoid valves V3 and V4, and when the first cleaning is completed, a second cleaning operation is subsequently performed, and is performed for the set number N of times.

Therefore, the cleaning effect can be enhanced by intermittently cleaning not only the inside of the hydraulic circuit 2 but also the inside of each of the solenoid valves V1 to V4 and the nozzle 1. In addition, setting operations such as the cleaning time and the number of intermittent cleanings and the cleaning mode switch SW1 are performed.
The cleaning control can be performed by the operation of
Operation can be easily simplified.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a chemical sprayer is mounted on a tractor body 4 to spray and spray a chemical on a soil surface, a crop, or the like will be described. The vehicle body 4 has a front wheel 6 and a rear wheel 7 that can be steered by a steering handle 5, and can travel by being transmitted to an engine mounted below a front hood 8. Reference numeral 9 denotes a cockpit, which is provided between the left and right fenders 10, and above which a safety frame 12 having a roof 11 is provided.

[0008] The liquid sprayer is mounted on the rear part of the vehicle body 4,
It is mounted and 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 containing liquid, and a pump P for sucking liquid from the tank 15 and discharging the liquid to the hydraulic circuit 2 is provided. An arm 17 that can be turned up and down is provided on the side, and a left and right lateral nozzle pipe 18 is
And the spray nozzles 1 are arranged along the nozzle pipe 18. Further, such nozzle pipes 18 are arranged in a plurality in the horizontal direction. A nozzle cover 19 is provided above each nozzle pipe 18.

When the pump P is driven by the PTO shaft 16 of the vehicle body 4, the chemical in the tank 15 is discharged to the pressure regulating valve 21 side of the hydraulic circuit 2 while being sucked through the filter 20. It is sent to the pressure regulating tank 22 side, distributed to each nozzle pipe 18, and sprayed downward from the nozzle 1. The excess liquid set by the pressure regulating valve 21 is returned to the tank 15 through the return pipe 23.

The pump P is a plunger type pump.
Is reciprocated in the cylinder 26, discharges the liquid sucked from the suction port 27 to the discharge chamber 28, and sends it to the hydraulic circuit 2 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.

The residual drug sensor 3 detects the properties of the chemical in the washing water sucked into the pump P. For example, by detecting the PH (hydrogen ion concentration) of the washing water,
The structure is such that the residual chemical solution in the washing water can be detected. The remaining medicine sensor 3 is a hydraulic circuit 2 other than the pump P.
May be provided at an intermediate position, or may be provided at an end portion of the nozzle pipe 18 or the like.

A cleaning control device CPU of the sprayer has a microcomputer, and a cleaning mode switch SW1 for performing automatic cleaning control, and solenoid valves V1 to V are provided on an input side.
4, a number setting switch SW3 for setting the number N of times of opening, a time setting switch SW5 for setting the opening time t for each of the solenoid valves V1 to V4, and a solenoid valve V
A water amount switch SW4 for setting the spray amount to the washing water amount of 1 to V4 is provided. In addition, a remaining drug sensor 3 is provided to detect a remaining drug in the pump P and the hydraulic circuit 2, and an operation switch SW2 for performing manual cleaning is provided.

When the cleaning is performed by the cleaning control unit CPU, the cleaning solution is supplied by discharging the chemical solution in the tank 15 or by inserting the suction port of the pump P into another cleaning tank or the like. And the cleaning mode switch SW1 is turned on. The cleaning 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 simultaneously opened as shown in the flowchart of FIG.
Each single solenoid valve is opened in the order of V2 → V3 → V4, and is sprayed from the nozzle 1 of each nozzle pipe 18 to wash and discharge the residual chemical in the hydraulic circuit 2. Such sequential opening and closing of the solenoid valves V1 to V4 is repeatedly performed over a set number N of times. Thereby, the automatic cleaning control is stopped.

When the remaining drug sensor 3 no longer detects the chemical solution (the neutrality is detected by the PH sensor), the solenoid valves V1 to V4 are closed to stop the cleaning operation. Is also good. 4 and 5, the difference from the above example is that the pressure regulating valve 21
Flow meter 3 for detecting residual water in return pipe 23 connected to
2, the actual spraying amount from the nozzle 1 is calculated based on the remaining pump amount obtained from the flow meter 30, and the actual spraying amount is compared with the set spraying amount set by the water amount switch SW4, When the calculation result exceeds a certain specified range (± 10%), the solenoid valves V1 to V4
The feedback control is performed so as to correct the spray amount by increasing or decreasing the open time t. Reference numeral 31 denotes a vehicle speed sensor, and reference numeral 33 denotes a driver that adjusts the length of the open time during the predetermined time t.

In FIG. 6, the difference from the above example is that the injection holes 34 of the nozzle 1 for the liquid master for disinfecting soil are formed in a spiral shape, and the injection holes 34 are sequentially arranged from the end surface of the base A to the end B surface. By forming so as to have a small diameter, the jetting force C of the liquid spouted from the spouting hole 34 is not scattered, and the spray area D is configured to be deeper on the soil surface G.

[Brief description of the drawings]

FIG. 1 is a piping diagram of a liquid sprayer.

FIG. 2 is a block diagram of a cleaning control device and a control flowchart thereof.

FIG. 3 is a side view of the tractor spreader.

FIG. 4 is a piping diagram of a liquid master showing a partially different embodiment.

FIG. 5 is a block diagram showing a partially different embodiment and a control flowchart thereof.

FIG. 6 is a sectional view of a nozzle for a liquid master for injecting liquid fertilizer into a ridge soil surface, and an action diagram.

FIG. 7 is a side view of a hydraulic pump unit.

[Explanation of symbols]

 1 Nozzle 2 Hydraulic circuit P Pump SW1 Washing mode switch V1 to V4 Solenoid valve t Fixed time N Number of times

Claims (1)

[Claims] 1. A liquid spraying machine having a hydraulic circuit 2 for spraying and discharging a liquid discharged by driving a pump P from a nozzle 1 at a tip end, by discharging washing water to the hydraulic circuit 2 after spraying is completed. A cleaning mode switch SW1 for cleaning, a plurality of solenoid valves V1 to V4 provided to be opened and closed for each nozzle block of the hydraulic circuit 2, and each of the solenoid valves V1
A cleaning control unit CPU for controlling V4 to V4 to be opened and closed at regular time intervals so as to repeat N times an appropriate number of times.