Welding gun three-dimensional adjusting and positioning device

A three-dimensional adjusting and positioning device for a welding gun comprises three sets of lead screw sliding block assemblies I, II and III which are the same in structure, arranged along the X axis, the Y axis and the Z axis from bottom to top and capable of accurately adjusting three-dimensional coordinates. Each lead screw sliding block assembly comprises a U-shaped guide base, a sliding block installed in the U-shaped guide base and driven by an adjusting lead screw, and a connecting end cover located at the front end of the U-shaped guide base. A welding gun is mounted on a sliding block of the screw rod sliding block assembly III at the top through a rear fixing disc bottom plate, a welding gun rear fixing disc connected with the rear fixing disc bottom plate and a welding gun front fixing disc; the bottom surface of a U-shaped guide seat of the screw rod sliding block assembly I positioned at the bottom is fixedly connected with a dovetail sliding block which is arranged ina dovetail seat and is d