Device for realizing signal processing of laser cutting head servo system

Abstract

The invention relates to a device for realizing the signal processing of a laser cutting head servo system, which comprises a band-pass filter, a blocking unit, a shaping unit and an isolation unit. The band-pass filter removes interference signals in a non-frequency range, filters and shapes the signals into digital square wave frequency signals; the blocking unit samples the square wave signals;the shaping unit carries out self-adaptive processing; and the isolation unit detects the interval between two rising edges of an input signal, shields an interfered capacitance value signal, and carries out the filling through an estimated value. By adopting the device for realizing the signal processing of the laser cutting head servo system provided by the invention, the height information ofa laser cutting head is expressed through the capacitance of a nozzle and a workpiece, the capacitance value signal is converted into a digital frequency signal so as to be processed, and hardware filtering and software self-adaptive anti-interference processing are adopted, so that the anti-interference capability is stronger, the requirement on a transmission line is low, and the field environment adaptability is strong.

Description

technical field [0001] The invention relates to the application field of laser technology, in particular to the field of digital motion control, and specifically refers to a device for realizing signal processing of a servo system of a laser cutting head. Background technique [0002] Laser cutting technology is to focus the laser beam into a small spot, so that the material at the focal point is vaporized instantly, forming a hole to complete the cutting. Compared with the traditional cutting method, it has the advantages of narrow cutting gap, fast cutting speed, good cutting surface quality, no tool loss, can cut almost any material and no running inertia. Therefore, laser cutting technology has been widely used in the processing industry. [0003] In the process of laser cutting, it is necessary to ensure the instant gasification of the incision in order to achieve the best effect. This requires a constant distance between the nozzle of the laser cutting head and the w...

AI Technical Summary

Problems solved by technology

The disadvantages of the first method are: 1) The analog signal is susceptible to interference and its normal operation is affected. The specific performance is that the follow-up function fails during the cutting process, and the abnormal vibration of the laser cutting head leads to processing failure.

2) Analog signals cannot be transmitted over long distances, and the quality requirements for cables are high

In the second method, compared with the first method, the capacitance value signal is converted from analog to digital frequency signal, and the anti-interference performance is greatly improved. However, when the actual application environment is disturbed, the digital frequency signal will be interfered and cause pulse loss. The traditional method The frequency acquisition method can no longer guarantee the follow-up effect of the laser cutting head

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