Enclosed type blackboard eraser

The utility model belongs to the technical field of the teaching equipment and specifically relates to an enclosed type blackboard eraser. This blackboard eraser is including wiping the board, the arc cover body, the closed -loop, thread tube and export, adhesive connection has thread tube in the middle of the inner wall of the arc cover body, thread tube's upper shed end is linked together with the upper shed end of the arc cover body, thread tube's lower extreme is equipped with the export, the aperture of export is less than thread tube's diameter, wipe the board arrange in and fixed connection in thread tube, closed -loop fixed connection is in the under shed border department of the arc cover body, the arc cover body is transparent material, the utility model discloses a can utilize current ordinary blackboard eraser to press down dirt handles, and do not need additionally to reform transform blackboard eraser body, old blackboard eraser before avoiding is idle, labour saving and time saving, the cost ha