Dust-free blackboard eraser

Abstract

The invention relates to auxiliary equipment for teaching, in particular to a dust-free blackboard eraser. The dust-free blackboard eraser comprises a blackboard eraser body (1). The blackboard eraser body (1) comprises two or more cotton-wool brush rolls (2). The cotton-wool brush rolls (2) of the blackboard eraser are connected with a dust storage box body (3) through rotating shafts. The distance between every two adjacent cotton-wool brush rolls (2) ranges from 0.8 cm to 1.5 cm. A brush body (4) is arranged at the position, below each cotton-wool brush roll (2), inside the dust storage box body (3). The free end of each brush body (4) is in close contact with the corresponding cotton-wool brush roll (2). A connecting plate (5) for connecting the brush bodies (4) is of a net structure. Dust humidifying devices (6) are arranged at the positions, below the connecting plate (5), inside the dust storage box body (3). A control switch is arranged at the outer side of the dust storage box body (3). The dust-free blackboard eraser has the beneficial effects that the structure is simple; production cost is low; chalk dust cannot fly everywhere in the blackboard erasing process; in addition, the chalk dust cannot fall onto the ground; and the dust prevention effect is good.

Description

technical field [0001] The invention relates to the technical field of teaching auxiliary equipment, in particular to a dust-free blackboard eraser. Background technique [0002] Chalk is an indispensable writing tool in teaching, and it is used in classes from elementary school to university. And the pollution problem of chalk dust has also attracted people's attention all the time, so there are many designs to solve chalk dust. Such as dust-free chalk, dust-proof blackboard eraser, etc., dust-proof blackboard eraser is generally designed with a circle of dust-proof sponge on the outer ring of flannelette of blackboard eraser, so that it can effectively suppress the rise of chalk dust to a certain extent. However, the dustproof effect of this kind of blackboard eraser is not obvious, and it is generally knocked when dealing with chalk dust. At this time, a certain amount of dust pollution will still be caused. For example, during class, teachers often use blackboard erase...

AI Technical Summary

Problems solved by technology

However, the dust-proof effect of this kind of blackboard eraser is not obvious, and it is generally used to knock the chalk dust when dealing with it. At this time, it still needs to cause a certain amount of dust pollution.

For example, during class, teachers often use blackboard erasers to wipe the blackboard, but the blackboard erasers commonly used in schools are only composed of shells and felts, and it is easy to make chalk dust fly when wiping the blackboard, which affects the teachers and students in the front row. Healthy body

At the same time, the chalk dust fell on the ground, which was very inconvenient for the students on duty when cleaning

The application number is 2008102036835, and the invention patent named dust-proof blackboard eraser solves the above problems, but this patented product does not fundamentally solve the secondary pollution of chalk dust. Pour off the chalk dust, which will also cause the chalk dust to rise again during the process of pouring out the chalk dust, causing dust pollution

But it does not solve the problem of chalk dust falling on the ground. The invention patent with the application number of 201210403010.0 solves the above problems, but it still has dust pollution when chalk dust is poured out

[0003] At present, there are also electric blackboard erasers that can absorb dust on the market, but if the electric wire leakage is very harmful to students, otherwise it will not be able to play the role of dust prevention

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