Method for digital closed-loop control capacitance raising system

Abstract

The invention relates to the technical field of numerical control, in particular to a method for a digital closed-loop control capacitance raising system. In a capacitance acquisition amplifier, the output end of an inductance-capacitance (LC) resonance circuit is connected with the input end of a signal amplifying circuit; in a raiser main control board, the output end of a signal receiving circuit is sequentially connected with the signal input end of a field programmable gate array (FPGA) chip, one input end of a main control board core processor and the other signal end of a servo motor interface circuit; the other two signal ends of the main control board core processor are respectively connected with one end of a human-machine interface and one end of an Ethernet interface in a bidirectional mode; the output end of the signal amplifying circuit is connected with the input end of the signal receiving circuit; and the output end of a magneto-electric conversion circuit of the signal receiving circuit is connected with the signal input end of the FPGA chip. Compared with the prior art, the method has the advantages that: after board capacitance is converted into digital frequency signals, the digital frequency signals are transmitted and measured, so that the method is strong in anti-jamming capability, is not limited by the transmission distance and is high in measurement precision.

Description

[Technical field] [0001] The invention relates to the technical field of numerical control, in particular to a method for a digital closed-loop control capacitance height adjustment system used in laser cutting processing equipment. [Background technique] [0002] In the laser cutting process, in order to obtain the maximum power density at the incision and ensure high-quality incision, the laser focus should generally be located at about 1 / 3 of the thickness of the workpiece below the surface of the workpiece. The height of the laser cutting nozzle 1 must be consistent. This height is also called the cutting height, which is generally between 0.5 and 1.5 mm, and 1 mm is the most commonly used. In the process of laser cutting and processing metal plates or wood plates, it is often encountered that the surface of the plate has radian lines, the surface of the material is not flat, the plate vibrates or the plate is deformed due to local high temperature. If the cutting heigh...

AI Technical Summary

Problems solved by technology

The biggest disadvantage of this method is: 1) The transmission process of the analog voltage signal is susceptible to interference, which reduces the measurement accuracy and cannot achieve accurate measurement of tiny capacitance, which reduces the tracking accuracy and speed of the system; 2) The impedance of the transmission signal cable itself, The size of the stray capacitance will directly affect the circuit where the measured capacitance is converted into a voltage signal, resulting in a decrease in measurement accuracy, high requirements on the length and quality of the transmission signal cable, and complex on-site debugging; 3) It is difficult to convert the capacitance signal into an analog voltage signal distance transmission

At the same time, due to the low measurement accuracy, the height following algorithm generally adopts the traditional PID control algorithm. Although it can ensure the stability of the system, the following speed and accuracy are not satisfactory.

[0006] In addition, the existing height adjustment system does not have a friendly human-computer interaction interface, no communication interface for data interaction, and only provides an IO-based handshake control interface

Therefore, its scalability and versatility are limited, and it cannot exchange data with laser cutting equipment in real time, which reduces processing efficiency and limits the development of cutting technology

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