Pushing mechanism and detection system

A pushing mechanism comprising:

• a position-changing device comprising a main plate and a pushing element movably disposed on a side of the main plate;
• a driving device connected to the main plate and configured to drive the position-changing device to move;
• a guide device, wherein after the guide device is in contact with the pushing element, the pushing element is allowed to switch between a first state and a second state;
• wherein a highest point of the pushing element in the first state is higher than a highest point of the pushing element in the second state,
• wherein the pushing element is rotatably connected to the main plate through a shaft, the pushing element comprises a first edge and a first corner adjacent to the first edge, and a distance between the first corner and the shaft is greater than a vertical distance between the first edge and the shaft,
• wherein a counterweight block is provided on the pushing element, and the counterweight block and the first corner are located on two sides of an axis of the shaft in a horizontal direction respectively, so that the pushing element has a trend of maintaining in the first state,
• wherein the guide device comprises a guide groove, a surface of the guide groove is a curved surface, wherein the curved surface comprises a lower section, a middle section and an upper section which are sequentially connected, a slope of the middle section is greater than a slope of the lower section, an angle between the upper section and the middle section is less than or equal to 90 degrees, and the slope of the lower section gradually increases from bottom to top of the lower section.