Automatic sample injector for immobilizing bacteria and algae

The utility model relates to an automatic sample injector for immobilizing bacteria and algae. The device comprises a micro-speed motor, a screw rod, a fixing sleeve and two injectors, the fixing sleeve is of a cylinder structure. A micro-speed motor is fixedly arranged at the top end of the fixed sleeve; an output shaft of the micro-speed motor is connected with the top end of the screw through acoupling; the screw rod penetrates into the fixing sleeve; the bottom end of the screw rod penetrates out of the fixing sleeve; a long-strip-shaped notch is formed in the side wall of the fixing sleeve. A nut is meshed with the screw rod; two push plates are symmetrically welded to the two sides of the nut and move with the long-strip-shaped notch as a track, two fixing rings are welded to the lower portion of the fixing sleeve in a mirror symmetry mode, the two fixing rings correspond to the two push plates in a one-to-one mode, the upper edge of a sleeve of the injector is clamped to the two fixing rings, and the h