Electric shock prevention device of electric welding machine

Abstract

The invention relates to an electric shock prevention device of an electric welding machine. A signal input end of the electric shock prevention device is connected with an electric shock prevention circuit, a ring wire detection circuit and a transmission switching signal circuit which are connected with a ring wire; the outputs of the electric shock prevention circuit, the ring wire detection circuit and the transmission switching signal circuit are respectively connected with a switching circuit of a contactor; the output of the transmission switching signal circuit is also connected with the electric shock prevention circuit, and the output of the switching circuit of the contactor is also connected with the ring wire detection circuit. The ring wire is formed by sequentially wrapping a core wire, an insulating layer, a shielding layer and an outer insulating layer from inside to outside. The electric shock prevention device is quick and reliable in tripping and good in electric shock preventing effect. With the adoption of the ring wire (the ring wire is sleeved on a finger or held in the palm; or the ring wire is connected with an electric conducting object, and the electric conducting object is contacted with hands or wrists, ankles and the like), a weak electric induction signal generated when any part of the body of an electric welder gets an electric shock can be extracted synchronously and accurately, so as to quickly drive high-power relays or contactors to be in in outage.

Description

technical field [0001] The invention relates to an electric shock prevention device. In particular, it relates to an anti-shock device for electric welding machines that can synchronously and accurately extract the weak electric induction signals when any part of the welder's body gets an electric shock through a ring signal line, and quickly drive a high-power relay or contactor to cut off the power. . Background technique [0002] The shipbuilding industry has a large amount of welding work and a complex working environment. However, due to the lack of effective anti-shock technology to protect welders, there have been many incidents of welding machine deaths over the years, which have not been effectively resolved. [0003] At present, the welding machine energy saver used in various industries also has an auxiliary anti-shock function at no-load, which is realized by switching between low and high voltages during no-load and welding. When the voltage is low at no-load (...

AI Technical Summary

Problems solved by technology

However, in dangerous occasions such as ballast tank welding operations, the no-load voltage above 6V may still cause death by electric shock

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