A dust-free blackboard capable of automatic wiping

Abstract

The invention discloses a dust-free blackboard capable of realizing automatic wiping. The dust-free blackboard comprises a frame in which two scrolls are vertically arranged at intervals, a closed loop white board is wound on the two scrolls, and the scrolls are driven to rotate by a set of drive devices, thereby driving the white board to rotate; two blackboard erasers are arranged on the frame of one side outside the closed loop white board, and a pushing mechanism is arranged in the closed loop of the white board and comprises two support plates by which the white board can be pressed on the two blackboard erasers; chutes are formed in opposite sides of the two support plates, sliding blocks are arranged in the two chutes and articulated with the respective connecting rods, the two connecting rods are fixed on one pushing plate, a groove I is formed in the lower end of the pushing plate, a bearing is arranged in the groove I, and the inner hole of the bearing sleeves the end of one screw. The dust-free blackboard can be written by fountain pens and can prevent dust pollution, the writing area is doubled, and the dust-free blackboard can be used as a projection screen.

Description

technical field [0001] The invention relates to a teaching tool, in particular to a dust-free blackboard capable of automatic wiping. Background technique [0002] The existing automatic wiping structure is an ordinary wiping roller structure. The wiping roller used in it is in line contact with the board surface. Due to the small contact area when the line contacts, it is easy to have uneven force, and some parts of it cannot touch the board surface. Or there is a gap in the middle, which affects the wiping effect to a certain extent. In addition, traditional blackboards often use chalk to write, which brings a lot of dust pollution and damages the health of teachers and students. Therefore, based on the above problems, it is a problem to be solved urgently to develop a kind of teaching blackboard which is better in automatic wiping and does not bring dust pollution. Contents of the invention [0003] The present invention mainly aims to solve the above-mentioned proble...

AI Technical Summary

Problems solved by technology

[0002] The existing automatic wiping structure is an ordinary wiping roller structure. The wiping roller used in it is in line contact with the board surface. Due to the small contact area when the line contacts, it is easy to have uneven force, and some parts of it cannot touch the board surface. Or there is a gap in the middle, these situations affect the wiping effect to a certain extent

In addition, traditional blackboards are often written with chalk, which brings a lot of dust pollution and damages the health of teachers and students.

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