Views: 1 Author: Maichuang Laser Publish Time: 2021-04-22 Origin: MC
Plasma is a gas that is heated to a very high temperature and is highly ionized. It transfers the arc power to the workpiece. The high heat melts the workpiece and is blown off, forming the working state of plasma arc cutting.
After the compressed air enters the cutting torch, it is distributed by the gas chamber to form plasma gas and auxiliary gas. The plasma gas arc serves to melt the metal, while the auxiliary gas cools the various parts of the torch and blows off the molten metal.
The cutting power supply includes two parts: the main circuit and the control circuit. The electrical principle: the main circuit includes a contactor, a three-phase power transformer with high leakage reactance, a three-phase bridge rectifier, a high-frequency arc ignition coil, and a protection element. The high leakage reactance leads to a sharp external characteristic of the power supply. The control circuit completes the entire cutting process through the button switch on the cutting torch:
Pre-venting-main circuit power supply-high frequency arc ignition-cutting process-interest arc-stop.
The power supply of the main circuit is controlled by the contactor; the short of the gas is controlled by the solenoid valve; the control circuit controls the high-frequency oscillator to ignite the arc, and stops the high-frequency operation after the arc is established.
In addition, the control circuit also has the following internal locking functions: the thermal switch operates and stops working.