Mould locking mechanism

The utility model relates to a mold locking mechanism which comprises an air cylinder, a pull rod, a mold locking frame, a connecting rod and a pressing plate, the upper end of the pull rod is connected with a piston rod of the cylinder, and the lower end of the pull rod extends out of the lower surface of the mold locking frame; the upper end of the connecting rod is fixed to the mold locking frame, and the lower end of the connecting rod is located below the mold locking frame. The mold locking device is characterized in that an upper concave part and a lower through hole are formed in the mold locking frame, the upper concave part and the lower through hole are communicated up and down, and the cross section of the upper concave part is larger than that of the lower through hole; the pull rod penetrates through the lower through hole from the upper concave part, a push plate is arranged at the upper end of the pull rod, and the cross section of the push plate is larger than that of the lower through hole;