Welding devices and welding, installation and debugging methods thereof

A welding device, comprising:

• a baseboard, on which a left welding nozzle and a right welding nozzle are disposed respectively,
• a power shaft,
• a bidirectional moving wheel, and
• two welding nozzle connecting shafts, wherein the welding nozzle connecting shafts are connected to the left welding nozzle and the right welding nozzle respectively, and the bidirectional moving wheel which is driven by the power shaft drives the two welding nozzle connecting shafts to move towards or away from each other;
• the power shaft is rotatably connected to the baseboard;
• the bidirectional moving wheel is fixed on the power shaft, the bidirectional moving wheel includes two hooking portions, and the two hooking portions are centered on the power shaft in a centrosymmetric structure, the bidirectional moving wheel rotates under an action of the power shaft, the welding nozzle connecting shafts are disposed inside the two hooking portions respectively, and at least one welding nozzle connecting shaft performs a backward separation movement or a mutually approaching movement driven by the hooking portions when the bidirectional moving wheel rotates;
• and
• when the bidirectional moving wheel rotates, each welding nozzle connecting shaft moves along an inner side edge of the corresponding hooking portion and slides to an outer side edge of the corresponding hooking portion, and then enters and moves along an inner side of the other hooking portion, that is, the left welding nozzle and the right welding nozzle perform a linear reciprocating action driven by the hooking portions through the welding nozzle connecting shafts.