Sample analysis center positioning device of spark direct-reading spectrometer

The utility model provides a spark direct-reading spectrometer analysis sample center positioning device which comprises a base, a supporting rod is installed at the left end of the upper surface of the base, a fixing transverse rod is fixedly installed on the side wall of the upper middle portion of the supporting rod, a fastening rod is installed at the end, away from the supporting rod, of the fixing transverse rod, and a limiting through groove is formed in the upper side wall of the fastening rod. A moving rod is slidably arranged in the limiting through groove in a limiting manner; a mounting cavity communicated with the limiting through groove is formed in the end, away from the supporting rod, of the fixed transverse rod, a micro motor is fixedly connected into the mounting cavity, the output end of the micro motor is fixedly connected with a movable gear, and clamping teeth meshed with the movable gear are mounted on the outer wall of one side of the movable rod. The moving rod is of a hollow structu