Movable beam structure

The utility model discloses a movable beam structure which comprises a sliding seat, an extrusion rod, a limiting block and a servo motor, the extrusion rod is fixedly arranged on the sliding seat and used for carrying out extrusion operation, the limiting block and the servo motor can position the position of the sliding seat, the limiting block carries out mechanical positioning on the sliding seat, and the servo motor carries out electric control positioning on the sliding seat. The extrusion rod and the extrusion container to be subjected to extrusion operation have the requirement for coaxiality, and when electric control positioning is started, in the moving process of the sliding base, the limiting block does not make contact with the sliding base and only serves as the measuring basis for positioning of the sliding base; when mechanical positioning is started, after the sliding base makes contact with the limiting block, the servo motor keeps a certain output torque, the position precision of the slid