Monitoring circuit of hypersonic flame spraying control system

Abstract

The invention relates to a monitoring circuit of a hypersonic flame spraying control system. The monitoring circuit comprises a programmable logic controller, a digital input and output module, a main circuit, a weak-current terminal group, a heavy-current terminal group, an alarm module, a motor executing module and a switch block. Parallel valve banks are adopted to shunt a gas and independently control, so that the conditions that a common needle valve in the prior art adjusts the flow of each gas and the gas flow greatly floats are avoided. A rotary knob emergency stop switch is arranged, so that a user can observe clearly, and a misoperation is easily avoided; when the emergency stop switch acts, equipment is powered off, and stops running, but the main circuit still supplies power to the programmable logic controller, so as to ensure that the system can be restarted at any time, and ensure the humanized design; an audible and visual double alarm is arranged in the alarm module, so that when a fault appears, a user can timely find out the fault, and when the equipment suddenly stops, an igniter cannot directly ignite, and can be used only when the equipment restarts the igniter, so as to prevent the misoperation.

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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