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Shotcrete machine has manual and automatic two different types of instruments. Spraying machine can be sprayed under the external aqueous slurry of lime and large white powder, while spraying machine can also be sprayed pesticides and water quality wine liquid, so, for Spraying machine, it’s different principles demonstrated by the different effects, the also want to be sure to be on the operational requirements taken. (1) manual Spraying machine structure and working principle: Manual Spraying machine is small, you can move the location of a person, the use of a person repeatedly pressing the joystick, one armed with lance to spraying, because without the power plant, with greater flexibility, it works: When Push rocker when push rod frame so that the left and right two plungers alternately in their respective cylinder reciprocating pump, continuous slurry will barrel inhalation successive left and right pump cylinder and successive stable tank pressure on people, so the surge tank the slurry was 8-12 atm ((1 MPa approximately) pressure, the slurry under pressure through the output port from the pulp slurry was spray head tube and bulk discharge. (2) automatic Spraying machine structure and working principle: Automatic Spraying machine shown in Figure 5-8, the same principles and manual spraying, the difference is that the plunger reciprocates by an electric motor through worm gear and crank linkage (or eccentric linkage) to drive. Therefore, the use of shotcrete to be in different environments, they make works, are not the same, only the same place, and that is constructed structure, which is to be on the safe operation of the different areas when Spraying machine , it is worth guaranteed.