Welding wire feeding device

A welding wire feeding device, comprising:

• a base, the base being formed with an accommodation trough, one end of the base having a first passage and a second passage;
• a fixing post, locked to the base;
• a pressing member, one end of the pressing member being provided with a fixed portion pivotally connected to the base, another end of the pressing member being pivotally connected with a driven wheel, the driven wheel being located in the accommodation trough of the base;
• a tension spring, the tension spring being connected between the fixing post and the pressing member;
• a motor, mounted to the base and formed with a shaft portion;
• a driving wheel, disposed on the base and pivotally connected with the shaft portion of the motor, the driving wheel being located at a position in contact with the driven wheel;
• a conveying mechanism, comprising:
• a tubular member, the tubular member being formed with a hollow tubular body and mounted to the base, one end of the tubular member being provided with a stud, the tubular member having a through hole therein corresponding to the first passage and at least one penetrating air hole in the vicinity of the through hole;
• a connector, the connector having a through hole and being fitted on the stud of the tubular member;
• a collet chuck, the collet chuck being disposed between the connector and the tubular member, the collet chuck having a through hole, a clamping end of the collet chuck being formed with a plurality of notches;
• a metal ring, fitted on the collet chuck and held between the stud and the clamping end;
• a press member, the press member having a through hole and being inserted into the tubular member;
• an elastic member, the elastic member being disposed between the press member and the tubular member;
• a cover head, fitted on the tubular member and having an outlet;
• and
• a conveying tube, inserted through the through hole of the tubular member, the through hole of the connector, and the outlet of the cover head in sequence and clamped by the clamping end of the collet chuck;
• a side cover, locked to the base, and
• a fixing seat, locked to the base and the side cover so that the conveying mechanism is coupled to the base.