Smooth automatic device and method for reservoir sediment flushing

A smooth automatic device for reservoir sediment flushing, comprising a sediment flushing funnel set at bottom of a reservoir dam and a sediment flushing pipe, one end of the sediment flushing pipe is smoothly connected to bottom of the sediment flushing funnel through a smooth connecting pipe, and an other end of the sediment flushing pipe is horizontally connected to a downstream river channel after passing through the reservoir dam;

• a trigger-control mechanism is installed inside the sediment flushing funnel, and a sediment flushing ball valve connected with the trigger-control mechanism is installed inside the sediment flushing pipe;
• wherein the trigger-control mechanism comprises:
• a vertical pipe set on an inner wall of the sediment flushing funnel, and an upper piston assembly and a lower piston assembly set inside the vertical pipe, capable of vertically sliding;
• the lower piston assembly is connected to top of a connecting rod, bottom of the connecting rod passes through the vertical pipe and is connected eccentrically with a first transmission gear, the first transmission gear and a second transmission gear are meshed, and the second transmission gear is linked to the sediment flushing ball valve;
• bottom of the vertical pipe is connected with bottom of a clean-water pipe, and top of the clean-water pipe is located in a clean-water area of a reservoir;
• and
• a height of top of the vertical pipe is lower than a height of top of the sediment flushing funnel;
• wherein the upper piston assembly comprises:
• an upper piston body and an upper spring arranged between the upper piston body and the inner wall of the sediment flushing funnel;
• a sealing ring is arranged between the upper piston body and an inner wall of the vertical pipe, and the sealing ring is used to keep sediment above the upper piston body separate from clean water below the upper piston body, so that a pressure difference of the upper piston body is equal to an underwater weight of the sediment;
• the lower piston assembly comprises:
• a lower piston body set below the upper piston body and a lower spring located between the lower piston body and the inner wall of the sediment flushing funnel;
• and
• the upper spring is inserted into the lower spring after passing through a center of the lower piston body.