Cover plate opening and closing mechanism of high-frequency preheater

The cover plate opening and closing mechanism of the high-frequency preheater comprises a box body and a cover plate, two installation seats are fixed to the top of the box body, and the installation seats are close to the back face of the box body; a rotating shaft is rotationally connected between the two mounting seats, and a connecting lug is fixed on the rotating shaft; the connecting lug is connected to the back surface of the cover plate, and a connecting piece is arranged on the cover plate above the connecting lug; a transverse limiting hole is formed in the middle of the connecting piece; a transverse rod is arranged in the limiting hole and connected with a driving rod through a U-shaped connector. Two guide sleeves are fixed to the back face of the box body, vertical guide grooves are formed in the guide sleeves, a driving rod penetrates through the guide grooves, a turbine is arranged on the driving rod in a threaded connection mode, and the turbine is connected with the movable end of a servo mo