Blackboard

Blackboard, including the blackboard face, the blackboard face sets up border and lower border, its characterized in that goes up the border side and sets up the intake pipe, the lower outside of surface who goes up the border sets up the slide rail, the inboard sets up jet -propelled pipe, jet -propelled pipe is linked together with the intake pipe that last border side set up, the external air -blower of intake pipe, the air -blower wind gap sets up the heater strip, the upper surface inboard at border sets up the guiding gutter down, the guiding gutter is linked together with the drain pipe that sets up to the side of border down, the last outside of surface at border sets up down the slide rail down, the utility model discloses a sponge after absorbing water is cleaned, whole no dust, and the evaporation of water with higher speed of jet -propelled pipe spun air current does not influence and normally gives lessons, jet -propelled pipe divides into a plurality of separate units, can select to dry to monoblock blackboard face, also can select to dry to some blackboard faces, has also solved the problem that the smaller classmate of height can not wipe the blackboard top simultaneously.