Fuente: WIPO "hemp" An industrial hemp stem test sample hemp combing device selecting and positioning device comprises a control shaft, limiting sleeves, a positioning plate, a reset spring, a frame body and a hemp combing device, the limiting sleeves are installed at the two ends of the hemp combing device respectively, anti-rotation limiting grooves are formed in the inner ring faces of the limiting sleeves, and the positioning plate is provided with a through shaft hole and connected to the frame body. A positioning groove is formed in the edge of the outer circumference, an anti-rotation limiting pin and a positioning pin are arranged on the control shaft and sequentially arranged in through shaft holes of the limiting sleeve and the positioning plate in a matched mode, the anti-rotation limiting pin and the anti-rotation limiting groove are in embedded fit, and the positioning pin and the positioning groove mutually form structural correspondence and can be selectively embedded in the positioning groove. The reset spring is arranged between the control shaft and the frame body. The device is applied to the hemp combing device in a matched mode, the selecting and positioning means of the hemp combing nail plate can be improved, multi-stage hemp combing treatment on the same platform face is achieved, the convenience, high efficiency, reliability and stability of control over the hemp combing device are enhanced, and the control use efficiency and the scrap removing and hemp combing work efficiency are improved.