A monitoring circuit of supersonic flame spraying control system

Abstract

The invention relates to a monitoring circuit of a supersonic flame spraying control system, including a programmable logic controller, a digital input and output module, a main line circuit, a weak current terminal group, a strong current terminal group, an alarm module, a motor execution module and a switch group . The present invention adopts a parallel valve group to divide the gas flow and control it separately, which avoids the situation that the gas flow has a large fluctuation due to the adjustment of the flow of each gas by the needle valve commonly used in the prior art; The stop switch is convenient for users to observe clearly, and it is easy to avoid misoperation. When the emergency stop switch operates, the equipment will be powered off and stop running, but the main line circuit still supplies power to the programmable logic controller, ensuring that the system can be restarted at any time, and the design is humanized; The alarm module is equipped with sound and light dual alarms. When a fault occurs, the user can find it in time; when the equipment stops suddenly, the igniter cannot be ignited directly, and the igniter can only be used after the equipment is restarted to prevent misuse.

Description

technical field [0001] The invention relates to the technical field of thermal spraying, in particular to a monitoring circuit of a supersonic flame spraying control system. Background technique [0002] Thermal spraying technology has a wide range of applications. Compared with other technologies, it has many advantages. The supersonic flame spraying that appeared in the 1980s promoted the development of thermal spraying technology. [0003] Supersonic flame spraying is also called high-speed oxy-fuel spraying. The content of supersonic flame spraying is: spray oxygen and fuel into the combustion chamber at high speed and high pressure, and after combustion, a high temperature of 2727 ° C and a high-speed expanding airflow above 7 times the speed of sound are generated. The combustion pressure can reach 820 kPa, and the spray powder is sent into this airflow, and the powder particles are heated and accelerated to spray onto the substrate to obtain a high-quality coating. D...

AI Technical Summary

Problems solved by technology

Although the control system is relatively complete, there is no specific line connection instructions combined with the controller. The settings of the flow regulating valve and oxygen solenoid valve are relatively simple. When in use, the supply of oxygen, propane and compressed air is very large, and the solenoid valve is too small. It is not conducive to the supply of gas raw materials, and the solenoid valve is too large, which makes it difficult to ensure flexible control of gas

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