Center point positioner for coal injection duct

Abstract

The utility model discloses a coal injection duct center point positioner, which is characterized in that a casing is arranged inside a shell, the casing and the shell are coaxially arranged, a fixed ring is fixed between the outer wall of the casing and the inner wall of the shell, a threaded pipe is fixed at the bottom end of the casing and provided with external threads, and a movable ring is screwed on the outer wall of the threaded pipe; the outer wall of the movable ring is slidably connected with the inner wall of the shell through a sliding piece, a limiting ring is fixed to the bottom end of the shell, and the top end face of the limiting ring movably abuts against the bottom end face of the movable ring. At least three sets of expansion supporting pieces are connected between the movable ring and the fixed ring, and positioning grooves matched with the expansion supporting pieces are formed in the outer wall of the shell. A transmission assembly is arranged between the top end of the sleeve and the inner wall of the shell; an objective table is fixed to the top end of the shell, a laser is fixed to the end face of the top end of the objective table, the axis of the laser is parallel to the axis direction of the shell, and the transmitting end of the laser faces the sleeve.

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