Large diameter welding pipe longitudinal welding autotracking machine

A large-diameter welding tube longitudinal seam welding automatic track device comprises a vision sensor integrally connected with a welding gun at the front of the welding gun, an interface circuit, a microcomputer controller, and a welding seam track executer. The vision sensor via the interface circuit is connected with the microcomputer controller, the microcomputer controller via the interface circuit is connected with the welding seam track executer, the welding gun and the vision sensor are mounted on a cart along the longitudinal seam of welding tube, the welding tube is arranged on a plurality of rolling wheel couples on a rolling wheel support, the welding seam track executer is composed of a rolling wheel transmitter arranged on the rolling wheel support and composed of a servo motor and a speed reducer connected with the microcomputer controller, and a rolling wheel support lifter arranged at the bottom of the rolling wheel support and composed of a frequency-variable speed-adjusting motor and a worm wheel lead screw lifter connected with the microcomputer. The utility model has compact structure, reliable operation, and application for the automatic track on large-diameter welding tube longitudinal seam track.