Automatic cover plate and toilet

An Automatic cover plate, comprising:

• a base provided with a compressed air device and a pneumatic limiting device, wherein a first flow passage is connected between the compressed air device and the pneumatic limiting device, a check valve is arranged between the compressed air device and the pneumatic limiting device, the check valve is configured for limiting air to flow from the pneumatic limiting device to the compressed air device, the compressed air device is configured with an air return structure, and the pneumatic limiting device is configured with a slow-leakage valve;
• a seat rotatably installed on the base;
• and
• a lid rotatably installed on the base, wherein the lid is operable between an open position and a closed position, the lid is in transmission fit with the compressed air device, and a first reset structure cooperated with the pneumatic limiting device is arranged between the lid and the base;
• wherein, when the lid is located in the closed position, the lid covers the seat;
• when the lid rotates from the closed position to the open position, the lid drives the compressed air device to discharge air in the compressed air device to the pneumatic limiting device through the first flow passage, so as to drive the pneumatic limiting device to limit working of the first reset structure;
• when the lid is located in the open position, when the seat is seated, the seat is capable of closing the slow-leakage valve, and when the seat is not seated, the pneumatic limiting device is capable of discharging air through the slow-leakage valve, so that the pneumatic limiting device unlocks the first reset structure, wherein the slow-leakage valve is capable of controlling an air leakage speed of the pneumatic limiting device;
• and after the pneumatic limiting device unlocks the first reset structure, the first reset structure is capable of driving the lid to rotate from the open position to the closed position, and the compressed air device realizes air return through the air return structure.