Reasonable selection of AC arc welder power switch
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 dangers. The most common dangers 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 hazards of copper and aluminum wire equipment that have not been selected and selected on the knife switch are well known, and it is very dangerous for 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, the formation of the knife switch without cover is extremely widespread, which has a greater 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 screw is simply damaged, resulting in poor wiring or equipment, the operator takes a line to hook the fuse to create a serious safety hazard. The operator who communicates the welding machine has more time to touch the electricity, and the operation site is disorderly. Therefore, the power switch should be powered by some non-exposed switchgear. If there is overload maintenance and short-circuit maintenance, the switchgear should be convenient for workers to operate. Its small size and easy equipment, moderate quotation and reliable quality. At present, there are many types of switches produced in China, each with its own characteristics. Due to its large size, the iron-shell switch (load switch) is inconvenient to operate, and it is usually less used. DZ5, DZ10 and other series of automatic switches are expensive due to wiring, high price, and some are 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 to implement instantaneous short circuit maintenance, there is a split operation handle, and the manufacturer supplies plastic or iron shell electric box casing. 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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