Show shelf is used in teaching

The utility model belongs to the appurtenance field is used in the teaching, concretely relates to show shelf is used in teaching, the on -line screen storage device comprises a base, support column and clipboard, wherein, the left and right sides of clipboard upper end all is equipped with a fixation clamp, the upper and lower both ends of the both sides wall of clipboard all are equipped with the spout of double -phase correspondence, all be fixed with the slide rail in each spout, all be fixed with outer pole between two slide rails of each side, the upper end of two outer poles is equippedwith last two fixation clamps corresponding with two last fixation clamps respectively, the equal sliding connection in inside of two outer poles has interior pole, the upper end of outer pole is equipped with the retaining member, be fixed with three -stage expansion link between the tip of two interior poles, three -stage expansion link includes sliding connection's the first body of rod each other, the second body of