The incoming form of powder is a material tank truck, the storage container of powder is called powder silo, and the volume of powder silo varies according to the storage days of powder and the location of powder silo. The charging hose on the powder tank car is connected to the punching pipe of the powder bin, the compressed air is started, and the powder powder enters the silo through the bulk punching pipe. It is generally required that the bulk inlet is equipped with a cyclone separator, so that the impurities are separated and collected at the inlet and can be discharged regularly. When conveying materials to the bin, dust is collected and installed on the top of the bin. According to different working conditions, pneumatic pulse timing dust removal positive pressure or negative pressure dust collector can be selected, and the dust collector is opened when the material is injected to ensure that the clean air is discharged from the powder bin. In general, three level gauges are set up in the bin part, which are respectively installed on the top of the bin, the lower part and the inlet of the Feeder to show the high, low and empty level. High material level through the field control cabinet to generate sound and light alarm, stop feeding. The low level meter alarms on the panel to show the low status in the bunker and remind to fill the bunker in time. Because the powder is easy to bridge and form holes in the bunker, the bunker must also be equipped with a hole vibration device. When the empty level of the feeder shows no material, the hole vibration system will automatically start to destroy the material bridge in the bunker. At the same time, in order to accurately understand the situation of the remaining powder materials in the silo, the special design of the silo weighing module is installed on the four legs of the silo, which can display the materials in the silo in real time so as to better know when to fill the silo.

The multi-screw feeder is installed at the outlet of the powder silo and connected to the silo by a crank-operated on-off valve. The feeder is composed of fuselage, feed port, discharge port, screw, observation port and drive system. The spiral comprises several groups of spirals that are placed side by side and have a certain overlap area. These spirals have the same rotational speed, and the adjacent spirals rotate in the opposite direction. A material channel is formed between the spirals, and the material in the bin can be filled with the entire feeder. The feeder can be controlled by frequency conversion, and the feeding capacity under different frequencies can be calculated according to the linear discharge relationship of the feeder. In practical application, by changing the frequency, the amount of powder given per unit time can be changed to realize the synchronous change of feed and water supply. The powder from the multi-screw feeder is fed through the screw conveyor to the powder dissolving tank.

The preparation and storage of powder milk are respectively in different tanks, and the configuration is completed in the mixing tank. The powder and water are fully mixed and dissolved in the mixing tank through the action of the mixer, forming a powder milk solution of l%~5%. The powder mixing tank comprises a slagging valve and a preparation water assembly, wherein the slagging valve comprises manual and automatic valves, and the preparation water assembly comprises a regulating valve, an electric valve, a weighing module, etc. The powder milk concentration is realized according to the powder quantity given by the multi-screw feeder, and the water quantity is controlled by the regulating valve and the Electronic scale. The prepared powder emulsion is overflowed through the overflow pipe to the storage tank for use, and the design volume of the powder milk storage tank cannot be less than 1/4 of the required solution amount per hour.

Due to the characteristics of the powder milk solution, the powder milk conveying and dosing system adopts a corrosion-resistant pump that can be adjusted by frequency conversion, and the flow parts are made of corrosion-resistant and wear-resistant materials. According to the difference of water volume and dosing rate, the weight of the dosing pump is adjusted by the frequency converter to achieve the dosing purpose. At the same time, the start and stop of the powder milk dosing pump is controlled by the liquid level of the powder milk storage tank. In practical applications, due to the distance between dosing point and dosing point, in order to avoid pipeline blockage and failure, regular water flushing should be designed in the inlet and outlet pipelines of dosing pump, and the dosing pipeline is designed to automatically switch the dosing of two pipelines.