Wet-adsorbing dust-free blackboard eraser

Abstract

The invention discloses a wet-adsorbing dust-free blackboard eraser, which comprises a hollow hairbrush, a small direct-current induced draft fan, a wet absorber and a dust-proof belt. The wet-adsorbing dust-free blackboard eraser is characterized in that the lower part of a fairing (1) is provided with wet cotton yarn (2); the direct-current induced draft fan is arranged between the wet cotton yarn (2) and the hairbrush (3); the hairbrush is provided with a hollow strip-shaped venting hole (5); the edge of the blackboard eraser is provided with the flexible dust-proof belt (6); a wooden bottom plate is provided with hairbrush hair units (8) and hollow strip-shaped holes (7); the hairbrush hair units (8) and the hollow strip-shaped holes (7) are evenly distributed; the flexible dust-proof belt (6) is made of belt-shaped flexible material, surrounds the blackboard eraser and is slightly lower than the hairbrush; and the wet cotton yarn (2) is flakey porous cotton fiber. The adsorbing cotton yarn of the wet-adsorbing dust-free blackboard eraser can be reused after being cleaned, and the eraser has the advantages of small volume, light weight, simple structure and low cost and is convenient to operate.

Description

technical field [0001] The invention relates to a blackboard eraser, in particular to a wet-absorption dust-free blackboard eraser. Background technique [0002] Blackboards are used more and more as an indispensable teaching tool, but the problem that has plagued everyone for many years is that chalk dust is flying all over the sky, which not only pollutes the environment but is also harmful to the health of teachers and students. At present, there are not many dust-free blackboard erasers, and most schools use ordinary erasers. There are roughly two types of common erasers. The first type: hairy type, this type of eraser will generate a lot of dust when cleaning the blackboard, the first three rows of desks and the teacher's platform will be covered with dust; the second type: hairless type, this type of eraser will generate more dust when cleaning the blackboard There is little dust, but the surface is easily stained, and the blackboard cannot be wiped clean, and a lar...

AI Technical Summary

Problems solved by technology

The first type: hairy type, this type of eraser will generate a lot of dust when cleaning the blackboard, the first three rows of desks and the teacher's platform will be covered with dust; the second type: hairless type, this type of eraser will generate more dust when cleaning the blackboard There is little dust, but the surface is easily stained, and the blackboard cannot be wiped clean, and a large amount of dust will be generated when cleaning the eraser

Can not meet the use requirements

At present, there are several dust-free blackboard erasers on the market, but the dust recovery method is basically dry absorption, which uses some high-power mechanical structures to work, which is large in size, high in cost, and inconvenient to use.

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