Inner mold opening and closing device of box culvert mold

Provided is a box culvert mold inner mold opening and closing device. Relates to a box culvert mold for concrete forming, in particular to an inner mold opening and closing device of the box culvert mold. The opening and closing device for the inner mold of the box culvert mold is compact in structure and convenient to disassemble. Comprising a first telescopic mechanism, a first inner mold frame and a second inner mold frame. The first inner mold frame and the second inner mold frame are matched, adjustable and movably connected. The telescopic mechanism I is arranged in the inner mold frame I; the first inner mold frame is provided with a plurality of first bending notches matched with the first telescopic mechanisms. The distance between the first bending notches is gradually increased from outside to inside in sequence. According to the utility model, the purpose of separating and demoulding between the inner mould frame I and the inner side wall of the box culvert product is realized. 箱涵模具内模开合装置。涉及一种混凝土成