Chain wheel type automatic hydraulic control flap gate

The invention discloses a chain wheel type automatic hydraulic control flap gate. Long strip-shaped fixed bases which are mutually symmetrical are longitudinally disposed on the two sides of the lower portion in a lock chamber respectively; one end of a longitudinal chain is fixedly connected to one side of the upstream end of each fixed base; a chain wheel is mounted on the chain in a matched mode; the other end of the chain is fixedly connected to the chain wheel; one side, which is not wrapped and matched with the chain, of the chain wheel is fixedly connected with supporting arms; the other ends of the supporting arms are fixedly connected with a gate plate; when the gate plate is located in the water stop position, the bottom edge of the gate plate is matched with a bottom plate of the lock chamber; the two side edges of the gate plate are matched with the two side walls of the lock chamber respectively; sealing strips are disposed at the two side edges and the bottom edge of the gate plate respectively; the included angle between the gate plate and the plumb line is 10-15 degrees. The chain wheel type automatic hydraulic control flap gate is novel in structure; opening and closing are flexible; a valve can be automatically controlled to open and close by means of the upstream water level; other power and devices are not needed; the automatic control over the water level is accurate; operation is stable and flexible; the production cost is low; the weight is small; management is convenient and safe; manpower and material resources are saved; maintaining is convenient; the application range is wide.