Plasma cutter

Abstract

The invention provides a plasma cutter. The cutter comprises a cutting gun, a CPU (central processing unit) control unit, a power source and a gas pump, wherein the power source and the gas pump are connected between the cutting gun and the CPU control unit; and a protection circuit unit is connected between the cutting gun and the CPU control unit and can be used for comparing the acquired voltage between two electrodes of a cutting gun nozzle with a set voltage threshold and outputting the logic level obtained through comparison to the CPU control unit in an isolated manner. The plasma cutter has the following beneficial effects: the protection circuit unit is connected between the cutting gun and the CPU control unit and can quickly identify whether the two electrodes of the cutting gun nozzle have short circuits, thus effectively avoiding damages of the electrodes and other components caused by electrode short circuits, not only being beneficial to prolonging the service lives of the electrodes and other components of the plasma cutter but also being beneficial to improving the safety performance of the whole plasma cutter and the cutting quality.

Description

technical field [0001] The invention relates to the technical field of plasma cutting machines, in particular to a plasma cutting machine with long service life. Background technique [0002] The current plasma cutting machine (including high-frequency plasma cutting machine and low-frequency plasma cutting machine) the working environment of the nozzle of the cutting gun and the electrode on the nozzle is high temperature, high pressure, and high current, which is very easy to damage, so it is usually used. Expensive metal materials and advanced manufacturing techniques are used to make these parts. However, due to the design structure, the distance between the two electrodes on the cutting torch nozzle of the high-frequency plasma cutting machine is designed to be very small; the two electrodes on the cutting torch nozzle of the low-frequency plasma cutting machine are in contact before starting the machine. This brings about a series of problems in use. After the nozzle ...

AI Technical Summary

Problems solved by technology

This brings about a series of problems in use. After the nozzle has been cut many times, due to metal slag splashing and carbon deposition during the cutting process, the two electrodes on the nozzle are easy to short circuit, or the metal slag will stick to the two electrodes after cooling. , it will affect the cutting quality, shorten the service life of electrodes and nozzles, and damage the electrodes and nozzles, or even burn the power supply, and the two electrodes will stick. burden and generate heat, thereby shortening the service life of the entire plasma cutting machine

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