Plasma cutting height adjuster and working method thereof

Abstract

The invention discloses a plasma cutting height adjuster and a working method thereof. The plasma cutting height adjuster comprises an electric arc voltage collecting module, a cutting gun height adjusting device and a computing module. The signal input end of the computing module is connected with the signal output end of the electric arc voltage collecting module. The signal output end of the computing module is connected with the cutting gun height adjusting device. A set electric arc voltage value corresponding to workpieces of different cutting thicknesses is arranged in the computing module. The computing module is used for driving the cutting gun height adjusting device to act according to the real-time electric arc voltage value collected by the electric arc voltage collecting module, and therefore the height distance between a plasma cutting gun and the workpieces is adjusted, and the real-time electric arc voltage value produced when the plasma cutting gun cuts the workpieces tends to the set electric arc voltage value. The self-adaption adjustment can be conducted on electric arc voltage of the plasma cutting gun by adjusting the height of the plasma cutting gun in the cutting process, and therefore cutting quality and accuracy are improved.

Description

technical field [0001] The invention relates to a plasma cutting height controller and a working method thereof. Background technique [0002] At present, plasma cutting has applied the cutting method of high-energy melting cutting with plasma arc as the heat source, which has the advantages of fast cutting speed, narrow heat-affected zone of the incision, small deformation of the workpiece, and good cutting precision, and is widely used in automatic cutting of metal sheets . However, in today's increasingly demanding metal sheet cutting quality, plasma cutting only relies on semi-automatic cutting with manual adjustment of arc length or automatic cutting with analog adjustment of arc length controlled by DC motor, which is difficult to meet the requirements of cutting quality and cutting efficiency. [0003] During the cutting process, it is very important to control the height distance between the plasma cutting gun and the workpiece. When the cutting speed and the nozzle...

AI Technical Summary

Problems solved by technology

[0004] At present, domestic CNC plasma cutting height tracking control is generally realized by PWM pulse analog control DC motor driving rack and pinion. Although the circuit is simple and low cost, it also has low control accuracy, large fluctuations in the control height range, and often requires manual control. Disadvantages such as regulation

In addition, the plasma needs to move the cutting torch to a certain height from the plate before starting the arc, and the distance is generally small. Using a DC motor to control the cutting torch for initial height positioning and starting the arc, not only the required height is difficult Accurate control, also has the disadvantage of large heat-affected zone at the cutting point of arc initiation

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