Automatic safety protection device for metal type counter-pressure casting machine

The utility model discloses an automatic safety protection device for a metal type counter-pressure casting machine. The automatic safety protection device comprises a supporting column, a sleeve, a spring, a rotating air cylinder, a shaft, a support and a gear pair. In the working process, the movable plate is opened relative to the middle plate and ascends to the upper limit position, the rotary air cylinder drives the gear pair to rotate and drives the supporting column to rotate by 90 degrees anticlockwise, and the supporting column is made to swing between the middle plate and the movable plate; when the movable plate falls off due to misoperation or system faults, the movable plate falls off by extremely small displacement and can be supported by the supporting columns with the middle plate as a supporting point, and therefore operators are protected. Before the movable plate normally falls, the rotary air cylinder drives the gear pair to drive the supporting column to clockwise rotate by 90 degrees, an