The invention discloses an automatic
welding mechanical arm, which comprises a supporting base of the mechanical arm, a
cylinder air belt, a
cylinder air belt piercing groove, a
welding head of the mechanical arm, a buffer mechanism, a lubricating mechanism and a
protection mechanism. The buffer mechanism includes a semicircular arc groove , the semi-circular arc groove is set on the inside of the
cylinder air belt through the groove, the inside of the semi-circular arc groove is provided with a semi-circular arc, and both ends of the inner side of the semi-circular arc are fixedly connected with connecting short shafts. The end of the connecting short shaft is fixedly connected with an arc-shaped
cushioning piece, and a cylindrical spring groove is opened inside the cylinder air belt through the groove; through the design of the arc-shaped
cushioning piece, the clamping and fixing of the cylinder air belt can be realized. At the same time, it can provide
cushioning for the cylinder air belt, reducing the bending range of the cylinder air belt when the arm joint of the
robot arm rotates, so as to reduce the damage of the cylinder air belt. Through the design of the semi-circular arc, it is convenient to realize two arc buffers. The movement of the sheet in the same direction, through the design of the buffer spring, is convenient to provide buffering effect on the semi-circular arc sheet.