Sliding block structure of stacker

The utility model relates to a sliding block structure of a stacker. The sliding block structure comprises a sliding block bracket and a pulley structure on the sliding block bracket, wherein the sliding block bracket comprises a supporting plate of an L-shaped structure; two sides of the supporting plate are fixedly connected with side plates; a mounting plate is fixedly connected between the two side plates; the middle of the mounting plate is provided with a mounting hole and U-shaped troughs positioned on two sides of the mounting hole; a bottom plate of the supporting plate is provided with a mounting shaft used for fixing a chain. The pulley structure comprises a middle pulley rotatably installed in the mounting hole, and two side pulleys rotatably arranged in the U-shaped troughs, wherein a first axle of the middle pulley is parallel to the surface of the mounting plate and is horizontally arranged; a second axle of each side pulley is vertical relative to the surface of the mounting plate; a rolling clamping space is formed between the surface of each side pulley and the surface of the middle pulley. The sliding block structure slides on an upright tube by the side pulleys and the middle pulley, and has the advantages of simple structure, convenience in replacing of each pulley, low cost, high installation efficiency and low installation cost, and the upright tube can be directly installed without processing a chute.