Chalk writing teaching dust-free system

Abstract

The invention discloses a dust-free teaching system for chalk writing. The dust-free teaching system for chalk writing comprises a chalk sleeve, an internal thread, thread-shaped silica gel, a screw rod and a dust collection device, wherein the chalk sleeve comprises a shell, the shell is of a strip-shaped hollow structure, and a first shell part and a second shell part which are mutually connected end to end are comprised in the length direction of the shell; the internal thread is arranged on the inner sidewall of the shell; the thread-shaped silica gel is inlaid and distributed on the inner sidewall of the shell with the internal thread; the screw rod is in threaded connection with the shell; and the dust collection device is a strip-shaped groove body with an open upper end, the dust collection device is horizontally arranged on a writing surface of a backboard, the two ends of the dust collection device are in slide connection with the two side edges of the backboard, and the surface of the dust collection device has the same colour as the backboard. The dust-free teaching system for chalk writing, which is disclosed by the invention, is capable of providing the chalk sleeve for sleeving and fixing a chalk for writing for a user, and protecting the hands of the user from being polluted; and moreover, the dust collection device is also capable of synchronously collecting scattering chalk dust during writing, without pollution to an indoor environment.

Description

technical field [0001] The invention relates to the technical field of teaching aids, in particular to a dust-free teaching system for chalk writing. Background technique [0002] Chalk is a tool widely used in daily teaching. It is generally used to write on blackboards. The composition of chalk is a white precipitate of calcium sulfate, which is not easy to be decomposed, and the particles are larger than dust. Now, the chalk used in China mainly contains two kinds of common chalk and dust-free chalk (water-based chalk). Dust-free chalk is made of special polymer materials and pigments. It can be written on a dry blackboard or a wet blackboard. However, in order to prevent dust when writing, its adhesion and The firmness on the blackboard, therefore, dry erase is not easy to fall off, and its cost is higher than ordinary chalk, and universal applicability is lower. [0003] In addition, the common way to use ordinary chalk is to directly hold the chalk for writing. On th...

AI Technical Summary

Problems solved by technology

Dust-free chalk is made of special polymer materials and pigments. It can be written on a dry blackboard or a wet blackboard. However, in order to prevent dust when writing, its adhesion and The firmness on the blackboard, therefore, dry erase is not easy to fall off, and its cost is higher than ordinary chalk, and its universal applicability is low

[0003] In addition, the common way to use ordinary chalk is to directly hold the chalk for writing. On the one hand, when the chalk is relatively long, it is easy to break; Replacement, the discarded chalk heads are really a waste of resources

And because the chalk contains high alkalinity, it has also caused certain pollution to the user's skin after being handled for a long time, and the silt on its surface is also easy to stick to the surface of the clothes, which is not easy to carry

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