Environment-friendly chalk sleeve

Abstract

The invention discloses an environment-friendly chalk sleeve which comprises a base and a shell, wherein a cavity is formed in the base; a power supply is mounted in the cavity; an annular groove is formed in the end, far away from the power supply, of the base; an annular limiting lug corresponding to the annular groove is formed in the inner wall of one end of the shell; the shell is mounted on the base in a sleeving manner; the limiting lug is positioned in the annular groove; a sliding block and a screw are arranged in an inner cavity of the shell; a screw hole corresponding to the screw is formed in one end of the sliding block; the sliding block is connected with the screw through the screw hole; and the end, far away from the screw hole, of the screw is connected with the base. The environment-friendly chalk sleeve can change the length, out of the shell, of a chalk and changes the using length of the chalk through rotating the base, and generated chalk dust can be collected immediately, so that the chalk dust does not scatter anywhere to realize the effect of protecting a user; and the environment-friendly chalk sleeve is simple, convenient and environment-friendly to use and enables the user to work in a safer and more efficient manner.

Description

technical field [0001] The invention relates to the technical field of teaching supplies, in particular to an environment-friendly chalk cover. Background technique [0002] For a long time, chalk and education have formed an indissoluble bond, but the harm of dust cannot be avoided by anyone. And most of the chalk sets can’t change the use length of the chalk by rotating like the lipstick device. Nowadays, the chalk used by teachers in class is bare. This kind of chalk has been used for decades. As we all know, the main components of chalk are calcium carbonate and sulfuric acid. Calcium, or a small amount of calcium oxide. The biggest disadvantage of this kind of chalk is that it is easy to make limestone or gypsum stick to the finger when it is directly touched by hand. After a long time, the user's finger skin will become rough, cracked, peeled off, and even cause finger skin erosion, which seriously affects the use. The physical and mental health of the patient, plus ...

AI Technical Summary

Problems solved by technology

And most of the chalk sets can’t change the use length of the chalk by rotating like the lipstick device. Nowadays, the chalk used by teachers in class is bare. This kind of chalk has been used for decades. As we all know, the main components of chalk are calcium carbonate and sulfuric acid. Calcium, or a small amount of calcium oxide

The biggest disadvantage of this kind of chalk is that it is easy to make limestone or gypsum stick to the finger when it is directly touched by hand. After a long time, the user's finger skin will become rough, cracked, peeled off, and even cause finger skin erosion, which seriously affects the use. The physical and mental health of the patient, coupled with problems such as chalk dust is unhygienic, fragile and easy to break, most of the modern chalk sets do not have a chalk dust suction device, which often affects the teaching function and normal use of chalk in teaching.

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