Communication arc welding machine is the most widely used electrical equipment in welding technology. Now industrial enterprises usually use the HK2 series of knife switch as the power switch of small and medium-sized welding machine. In practice, this series of knife switches will have some unsafe risks, and the common risks are as follows:
(1) The stable fuse is easily melted. The blade switch fuse is usually a lead-tin fuse. Because the device reduces the cross section of the fuse touch, the touch is poor, and the fuse is most easily melted near the touch, which affects the worker's work. Therefore, the operator often replaces the copper and aluminum wire. The safety risks of copper and aluminum wire equipment that have not been selected and selected on the knife switch are well known, and it is very risky for the use of electrical equipment and personal safety.
(2) The protective plastic cover is easily damaged. In practice production, due to frequent use, the operator inadvertently damages, throws away or does not equipment and other factors, resulting in extreme closure of the knife switch, which has a great impact on safe production.
(3) The power supply lead screw is easily damaged. The use of the knife switch for a long time and its own characteristics, the lead wire screw is simply damaged, resulting in the wiring is not strong or the equipment is not up, the operator takes a wire to hook the fuse operation has a serious safety risk. The operator who communicates the welding machine has more time to touch the electricity and the working site is complicated. Therefore, the power switch should be powered by some non-exposed switchgear, and there must be overload maintenance and short-circuit maintenance. The selected switchgear should be convenient for workers to operate and require Its small size and easy equipment, the price is moderate, the quality is reliable. At present, there are many types of switches produced in China, each with its own characteristics. Iron shell switch (load switch) because of its large size, equipment operation is not convenient, usually less choice, DZ5, DZ10 series of automatic switches due to wiring costs, high quotation, and some of the electrification are also exposed and less used, DZ6, DZ12, DZ13 series automatic switch, the trip unit is double tripping, double metal plate is used for overload maintenance, iron core and armature equipment are used for short-circuit short-circuit maintenance, there is a split operation handle, and the manufacturer supplies plastic or iron shell electric box shell. No live parts are exposed, equipment operation is convenient, and the price is moderate. If such an automatic switch is used as the power switch of the welding machine, it can deal with the safety problems caused by the use of the knife switch. According to the current of the welding machine, the rated current of the automatic switch release can be reasonably selected, which can satisfy the requirements of the production and safety of the welding machine.
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