Automatic spraying system capable of stabilizing flow

Abstract

The invention discloses an automatic spraying system capable of stabilizing the flow. The automatic spraying system is characterized in that an air compressor is connected with an air inlet of a pneumatic slurry pump through an air inlet pipe and an air inlet valve, the pneumatic slurry pump is arranged on a slurry barrel, a feeding port of the pneumatic slurry pump is provided with a material guide pipe, and the material guide pipe extends into the slurry barrel; a discharging port of the pneumatic slurry pump is connected with a spray gun through a material conveying pipe, and a pressure stabilizing valve and a pressure regulating valve are arranged on the material conveying pipe; the spray gun is clamped at the top end of a mechanical arm, and the position and the spraying angle of thespray gun are adjusted through the mechanical arm; and a controller controls the flow pressure of the pneumatic slurry pump, the pressure stabilizing valve and the pressure regulating valve through aproportional valve, and is connected with the mechanical arm, the spray gun and a rotary heating platform. The automatic spraying system has the characteristics that the structure is simple, the operation is convenient and the control precision is high; and the slurry can be automatically sprayed and the flow of the slurry can be stable, and therefore the polycrystalline capacity is improved, thepolycrystalline cost is reduced, the automation degree is high, and the labor is saved.

Description

technical field [0001] The invention relates to an automatic spraying flow stabilization system, which belongs to the field of crucible preparation equipment. Background technique [0002] Silicon nitride (Si3N4) is an important structural ceramic material. It is a superhard substance, which has lubricity and wear resistance; except for hydrofluoric acid, it does not react with other inorganic acids, has strong corrosion resistance, and is resistant to oxidation at high temperatures; and it can also resist cold shocks, Heating to above 1000°C in the air, rapid cooling and then rapid heating will not break. Crucible spraying is to spray the silicon nitride slurry mixed with pure water and silicon nitride powder on the surface of the crucible, and under the action of heating, the silicon nitride slurry is evenly adsorbed on the surface of the crucible to form a powder coating. The purpose of forming the silicon nitride coating is to protect the quartz crucible from silicon a...

AI Technical Summary

Problems solved by technology

In the existing spraying process, manual spraying needs to manually adjust the flow rate, the spraying flow rate is unstable, the quality varies, and the workload is large and the efficiency is low; the automatic spraying of the machine mainly uses a peristaltic pump to supply the slurry, and the slurry flow rate Uncontrollable with the spraying pressure, affecting the quality of crucible spraying

[0004] After long-term observation, it is found that the instability of slurry supply is one of the main factors affecting the crucible spraying. The flow fluctuation of silicon nitride slurry leads to unstable spraying output, which affects the coating uniformity of the spraying crucible, and the thickness of the side wall and bottom coating. Can not control

At the same time, the slurry flow rate and slurry spraying pressure affect the softness of the quartz sand at the bottom of the high-efficiency crucible, which further affects the guidance of the quartz sand to grow crystals, resulting in fluctuations in the crystal grains and reducing the polycrystalline efficiency.

[0005] Therefore, those skilled in the art are committed to developing an automatic spraying flow stabilization system to achieve automatic spraying and flow stabilization while flexibly controlling the flow rate and pressure of silicon nitride slurry, effectively solving the low pass rate of crystal ingots caused by the original crucible spraying process , high proportion of crystal ingot cracks, unstable crystal grains, etc., so as to increase polycrystalline production capacity and reduce polycrystalline cost

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