Fixing device for positioning and welding PCB (Printed Circuit Board)

The utility model belongs to the technical field of PCB (printed circuit board) welding, and discloses a fixing device for PCB positioning and welding, which comprises a rack, an upper loading table and a middle loading table are sequentially fixed on one side of the rack from top to bottom, and the top of the middle loading table is connected with an operating table; a mounting inner groove is formed in the bottom of the upper loading table, and a gear ring is rotationally mounted in the mounting groove; a driving motor is fixedly mounted at the top of the upper loading table, the output end of the driving motor is connected with a driving gear, and the driving gear is meshed with the gear ring; a lead screw motor and a fixing block are symmetrically and fixedly installed at the bottom of the gear ring, a rotatable lead screw and a fixed second guide rod are connected between the lead screw motor and the fixing block, the lead screw is spirally sleeved with a negative suction head, and the second guide rod c