When the rotary mechanical grid is running, the drive device installed above the load trolley drives the trolley to move along the track. When it reaches the predetermined grid slag removal position, the gripper (arc slag removal tooth rake) moves down under the traction of the wire rope. Movement, when the slag removing tooth rake reaches the bottom of the grille, the control system closes the arc tooth rake, and at the same time, the slag removing tooth rake is raised to start slag removal. When the tooth rake reaches the predetermined lifting height, the load trolley is instructed to move to the designated point for unloading.

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