Non-high-frequency arc ignition circuit of computer numerical control (CNC) plasma cutting machine
A plasma cutting machine and arc ignition circuit technology, applied in plasma welding equipment, welding equipment, metal processing equipment and other directions, can solve the problems of complex control circuit design, and achieve the effects of reliable transfer, simple optimization of circuit design, and low input cost
Active Publication Date: 2012-02-22
JIANGSU DADE HEAVY IND
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Problems solved by technology
DSP digital control is often applied, and the design of the control circuit is very complicated, and this technology is only mastered by a few domestic R&D teams and is constantly being developed and improved.
Method used
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Embodiment Construction
[0012] The present invention will be further described below in conjunction with specific drawings and embodiments.
[0013] like figure 1 As shown: the arc ignition circuit includes the main circuit of the plasma cutting machine, the main circuit of the plasma cutting machine is connected to the cutting torch, the cutting torch includes electrodes and nozzles, and the electrodes and nozzles are connected correspondingly. Nozzle equipotential contact connection. The main circuit of the plasma cutting machine is connected with the main control board through the trigger circuit. The input end of the main control board is connected with the gun switch and the current sensor for detecting the working current of the cutting torch. The output end of the main control board is also connected with the solenoid valve and the small The arc control board is connected, and the small arc control board is connected with the nozzle through the thermistor PTC and the high-power resistor R. W...
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The invention relates to a non-high-frequency arc ignition circuit of a computer numerical control (CNC) plasma cutting machine. The non-high-frequency arc ignition circuit comprises a plasma-cutting main circuit, wherein, the plasma-cutting main circuit is connected with a master control board through a trigger circuit; the master control board is connected with a solenoid valve, a current sensor, a spray gun switch and a minor arc control board; and the minor arc control board is connected with a nozzle through a thermistor and a high-power resistor. In the invention, the nozzle is separated from an electrode by adopting the compressed air sprayed by the solenoid valve, and sparks which are generated during the short circuit between the electrode and the nozzle ionize the compressed airso as to form a plasma arc between the electrode and the nozzle; when the compressed air is sprayed out of the nozzle to form a high-temperature flame flow and the nozzle is close to a workpiece, an arc is formed between the electrode and the workpiece under the action of the high-temperature plasma flame flow; and when the current sensor detects that the electrode is matched with a set current value of the workpiece, the arc between the electrode and the nozzle is extinguished. The non-high-frequency arc ignition circuit of the CNC plasma cutting machine has the advantages of simple structure, lowered cost, fewer interferences on the NC equipment, good stability, and safety and reliability.
Description
technical field [0001] The invention relates to an arc starting circuit, in particular to a non-high-frequency arc starting circuit of a numerically controlled plasma cutting machine, which belongs to the technical field of cutting machine arc starting. Background technique [0002] CNC plasma cutting machine is efficient and fast, and has been widely promoted and used in the welding and cutting industry. Although the traditional high-frequency high-voltage arc ignition technology has a high success rate of arc ignition, it cannot avoid serious electromagnetic interference caused by high-frequency high-voltage, and cannot be applied in places with strict requirements for automatic numerical control cutting and electromagnetic interference. In this environment, non-high frequency arc ignition technology appears. [0003] Non-high-frequency arc ignition is also called contact arc ignition. It requires the cutting torch and the nozzle to be in direct contact with the short cir...
Claims
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Inventor 李红星李明杰
Owner JIANGSU DADE HEAVY IND