Novel method for hot cutting

A new type of thermal cutting technology, used in arc welding equipment, manufacturing tools, welding equipment, etc., can solve problems such as insufficient reliability, and achieve the effect of improving driving power, low power consumption, controllable AC output, and low power consumption

Inactive Publication Date: 2009-11-11
SHANGHAI HUGONG ELECTRIC WELDING MACHINE MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are deficiencies in cutting current (the maximum cutting current in China is 160A, and 200A in foreign countries), inverter output waveform control technology and reliability.

Method used

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  • Novel method for hot cutting
  • Novel method for hot cutting
  • Novel method for hot cutting

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with accompanying drawing and embodiment:

[0018] Such as figure 1 Shown, a kind of novel thermal cutting method is characterized in that comprising the following steps:

[0019] The alternating current is sent to the inverter after being rectified, filtered and chopped to generate intermediate frequency alternating current;

[0020] The intermediate frequency alternating current is stepped down by a power transformer, and then rectified and filtered twice to form a stable direct current to supply the cutting arc.

[0021] It also includes sampling the current feedback signal of the direct current and amplifying it after being processed by a filter circuit.

[0022] It also includes sending the amplified current to the PWM controller, driving the circuit and feeding it back to the inverter.

[0023] The rectification and filtering is completed by a single-phase half-wave rectification circuit modul...

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Abstract

The invention provides a novel method for hot cutting. The method is characterized by comprising the following steps that: alternating current is fed into an inverter to generate medium frequency alternating current after being subjected to rectifying, wave-filtering and chopping; and the medium frequency alternating current is subjected to voltage reduction by a power transformer, and secondary rectifying and wave-filtering to form stable direct current to be supplied to cutting arc. The method has the advantages that dropping characteristic is set to generator characteristic, so that the method has high success probability of arc generation and low power consumption; inverter technology is the key point of realizing high power output by an inverse air plasma cutting power supply, IGBT is used as a switch element, and a full-bridge inverse circuit is adopted, so that quick and low power consumption controllable alternating current output can be realized; drive power can be effectively improved, optimal drive voltage is selected, and implementation of overvoltage overcurrent protection is the basic use principle of the IGBT module; and reasonable selection of the medium frequency transformer can improve system reliability.

Description

technical field [0001] The invention relates to a thermal cutting method, in particular to an inverter air plasma cutting method. Background technique [0002] Inverter air plasma cutting is a new type of thermal cutting technology. Compared with traditional cutting machines, it has the advantages of high arc ignition success rate, high arc voltage, energy concentration, strong cutting ability, fast cutting speed, narrow kerf, smooth incision, Small deformation and other advantages. In recent years, with the advancement of inverter technology, the corresponding inverter plasma cutting technology has also developed in the direction of high power, high efficiency, and good stability, and its cutting current has also changed from the original tens of The amperage has risen to more than one hundred amperes, which not only greatly improves the cutting speed, but also improves the cutting quality. [0003] However, there are deficiencies in cutting current (the maximum cutting cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/013B23K9/10
Inventor 刘荣春
Owner SHANGHAI HUGONG ELECTRIC WELDING MACHINE MFG
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