Realization Of Controllable Function Of Liquid Spraying

0 Introduction
Atmospheric pressure has a close relationship with production and life. It is everywhere and everywhere. If you leave it, you will accomplish nothing and people will not be able to live Omron The real situation, how do we use it for us Production and living services? This is the problem we need to think about Omron [1]
1 Application Status
In the development of a new type of equipment, there is a problem that is to quantify the liquid constant velocity A small nozzle is sprayed out. In a conventional way, the liquid is filled into a closed container, filled with pressurized air, and then a control solenoid valve is installed between the pipes connected to the nozzle. When it is necessary to spray, the electromagnetic control is turned on. The valve can realize liquid spraying. Although this is a method of realization, and it is relatively simple, the problem that comes with it is that when the liquid is used up, when the liquid is refilled, it is necessary to release the high-pressure air in advance, which affects In the continuous operation of the spraying system, after the liquid needs to be installed, the compressed air is turned on again before the liquid can be put into use.
Can there be a way to stop the use of the existing system, and when the amount of liquid is insufficient? Just add liquid directly? The answer is certainly yes, let's take a look at how this method is implemented, how to use the liquid pressure of the atmospheric pressure
2 working principle
Figure 1 liquid control System schematic diagram, the liquid in the figure takes the flux as an example. The height of the container barrel of the flux is similar to that of the temporary storage tube. In the initial situation, each solenoid valve is completely closed. When starting work, first open 1# valve and 2# valve, at this time, under the action of atmospheric pressure, the liquid level in the temporary test tube rises to the same level as the liquid level inside the container barrel, wait for about 1 second, then close the 1# valve. And 2# valve, open the 3# solenoid valve, the front end of the 3# solenoid valve is equipped with CDA (compressed air) and has a pressure regulating valve to control the spray pressure. At this time, because the 1# and 2# valves are closed, After the 3# valve is opened, the pressure of the CDA will come in and be directly applied to the liquid surface of the flux, that is, the surface of the upper surface of the temporary storage tube. If the existing state is maintained, the flux will not be ejected or reduced. Before we can make it work properly, we still want to make the liquid ready To control is immediate and instant spray stop, how to achieve it? Open the 4#, 5#, and 6# solenoid valves while maintaining the pressure inside the temporary test tube. At this time, the flux is circulated by the pressure, passing through the filter, passing through the 4# valve, and then to the nozzle section, due to 5# and 6# Two solenoid valves for recycling are opened at the same time, so the flux does not stay at the nozzle, and directly returns to the inside of the recycling tank through the 5# and 6# valves, forming a small circulation of flux in a limited time. If you need to spray flux, close the 5# valve, the upper nozzle will form a spray, close the 6# valve, the lower nozzle will form a spray, if you want to stop the spray, just open the 5# or 6# electromagnetic The valve can control each spray once, and need to refill once to ensure the pressure and uniformity of the spray, so that the cycle is repeated, forming a cycle, and the small circulation control system for flux spraying is achieved, and the liquid is controlled in a relatively real-time controlled manner. Br /> In actual use, the bucket of the recycling drum and the flux can be shared, so that in addition to the loss of liquid from the nozzle, the remaining liquid can be completely reused, achieving the purpose of reducing the amount of control.
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Figure 1. Schematic diagram of the liquid control system
3 System Features and Program Implementation
The characteristics of this liquid control system are as follows:
1,     Using atmospheric pressure to replenish liquid, only need CDA power when spraying ;
2,     Introducing liquid recovery function, the maximum amount of liquid saving;
3,     recovery valve and control valve as much as possible Shorten the distance to achieve the purpose of real-time controllable liquids;
4,     Each solenoid valve needs to use a high-frequency valve with low power and flexible and quick response to shorten the response time.
Below we use OMRON's CP1H to achieve the above liquid control method, the sequence control program shown in Figure 2, Figure 3, Figure 4, the output signal shown in Figure 5, Figure 6. [2]

Figure 2. Liquid Control System Program Implementation 1

Figure 3. Liquid Control System Program Implementation 2
< Br /> Figure 4. Liquid control system program implementation 3

Figure 5. Liquid Control System Program Output 1

Figure 6. Liquid control system program output 2
4 Application situation
Of course, in actual use, during the debugging phase, some details should be considered, such as pipe diameter. The thickness of the fit, the size of the compressed air pressure, etc., including the setting of some time parameters are realized by the input device of the touch screen. Final commissioning the optimal effect to achieve the purpose for production use.
At present, this system has been widely used in automated spraying equipment and is running well! As shown in Figure 7 and Figure 8.

Figure 7. Part of the sprinkler Figure

Figure 8. Liquid replenishment part Figure