MULTIPUROSE DUSTLESS BLACKOARD WITH AUTO-CONTROL LIFE FOR TEACHING

The utility model relates to a multipurpose dustless blackboard with auto-control lifting for teaching, composed of a blackboard, guide tracks, a screen reel drum, a card-shelf reel drum, a picture clip, an electric dust cleaning brush, a handle, a force adding arm, a draw rod, positioning pins, positioning tiles, sliding tiles, a weight balancing block, a chain wheel, etc. The screen reel drum and the card-shelf reel drum are fixed above the blackboard, and the picture clip is fixed on the upper frame of the blackboard; the blackboard can be lifted up and down in the guide tracks via the sliding tiles which are installed on both the left and the right sides of the blackboard. The force adding arm is driven via the rotation of the handle, and that the blackboard is lifted up and down in the guide tracks is realized by the motions of an extension rod, the positioning pins and the positioning tiles. The weight balancing block is connected with chains on the chain wheel to make that the blackboard can not slide off from the guide tracks. The utility model which is lifted up and down conveniently has the advantages of more functions, no dust, easy fabrication, etc.