Side bearing plate welding and positioning clamp for main frame of overhead line system maintenance train

The utility model discloses a side bearing plate welding and positioning clamp for a main frame of a contact network maintenance train, which comprises a bottom plate and a plurality of panels, the panels are arranged at the upper end of the bottom plate, side plates are vertically mounted on two sides of the bottom plate, a plurality of clamping plates are arranged above the panels, and push rods for synchronously pushing the clamping plates are arranged on the inner sides of the side plates. Cylinders for driving the push rods to move are mounted on the outer side surfaces of the side plates, mounting ports are formed in the centers of the panels, electromagnets are mounted in the mounting ports, adjusting blocks are arranged in the mounting grooves, push blocks are mounted at the upper ends of the adjusting blocks, and a driving mechanism for moving the adjusting blocks is mounted on the bottom plate. The side bearing plate clamping device is simple in structure, the side bearing plates between the clampin