Sample extraction mechanism

The utility model provides a sample extraction mechanism. The sample extraction mechanism comprises a mounting seat, an injection tube and a separation assembly, and the injection tube is elastically and telescopically mounted on the mounting seat. The separating assembly comprises a separating pipe, a guide rod and a driving piece. The separating pipe comprises a pipe body and a lifting plate. The tube body is arranged on the injection tube in a sleeved mode. A concave-convex limiting structure is arranged between the injection tube and the tube body. And the lifting plate is horizontally arranged at the top of the pipe body and is provided with a vertical guide hole. One end of the guide rod is fixedly mounted in the mounting hole of the mounting seat, and the other end of the guide rod extends downwards and penetrates through the vertical guide hole of the lifting plate. And the driving piece is mounted on the mounting seat and is connected with and drives the separation pipe to reciprocate up and down. Th