CN201998636U - Dustproof chalk cover - Google Patents

Abstract

A dustproof chalk cover belongs to a teaching tool and mainly resolves the problem of influences to human bodies and environment caused by chalk holding and flying of chalk dusts when users write on blackboards. The dustproof chalk cover structurally comprises a chalk cover body formed by a sleeve, a hose and an air-suction air bag. The sleeve is a two-layer cavity, one end of the sleeve is opened, and the other end of the sleeve is closed. A circular negative pressure cavity is arranged between the cavity wall of the sleeve and the outer wall of the sleeve, a plurality of dust absorption holes are arranged at the edge of one end of the negative pressure cavity, and the other end of the negative pressure cavity is connected with the air-suction air bag through the hose. The dust absorption holes are communicated with the hose and the air-suction air bag. The dustproof chalk cover can avoid direct contact of hands and chalks and can absorb dusts while being used for writing.

Description

A kind of dustproof chalk sleeve

Technical field

The utility model relates to a kind of teaching aid, specifically is a kind of dustproof chalk sleeve.

Background technology

Class hour on to the student, the chalk teaching aid is the indispensable instrument of imparting knowledge to students at present, teacher can often take chalk to write on blackboard, because chalk dust has stronger adsorption capacity, hand directly contacts again for a long time with chalk, and hand skin can be badly damaged, the dust that flies upward descend slowly and lightly on the person and the classroom in, very unfavorable to health, bring out breathing problem especially easily, also very serious to the environmental pollution in the classroom; Frangibility when in addition, long chalk uses; Short and small chalk is not easy again to hold, and causes very big waste.

The utility model content

The purpose of this utility model is to provide a kind of dustproof chalk sleeve, and this chalk sleeve can be avoided hand directly to contact with chalk and can suck characteristics of dust while writing.

The technical scheme in the invention for solving the technical problem is: a kind of dustproof chalk sleeve, its structure comprises the chalk sleeve body that is made of sleeve, flexible pipe and air-breathing air bag, described sleeve is a double-layer cavity, the inner chamber one end opening other end sealing of sleeve, it between the internal chamber wall of sleeve and the sleeve outer wall ring-type negative pressure cavity, described negative pressure cavity one end end edge is provided with several air suction openings, the other end connects an air-breathing air bag by flexible pipe, and described air suction opening communicates with flexible pipe and air-breathing air bag.

The beneficial effects of the utility model are: during use; chalk is packed in the inner chamber of sleeve; holding sleeve outer surface writes; avoided hand skin directly to contact with chalk; owing between internal chamber wall and sleeve outer wall, be provided with a negative pressure cavity and air suction opening; suck dust while writing by pushing air-breathing air bag; reduced dust to user's health harm and to the influence of environment; because the protective effect of sleeve; can prevent that long chalk from fractureing and short and small chalk be difficult for to grip and abandoning and wasting phenomenon of causing is safe and convenient to use.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is an internal structure schematic diagram of the present utility model.

Among the figure: 1 sleeve, 2 air suction openings, 3 flexible pipes, 4 air-breathing air bags, 5 chalks, 6 inner chambers, 7 negative pressure cavities.

The specific embodiment

As shown in Figure 1 and Figure 2.A kind of dustproof chalk sleeve, its structure comprises the chalk sleeve body that is made of sleeve 1, flexible pipe 3 and air-breathing air bag 4, described sleeve 1 is a double-layer cavity, the inner chamber one end opening other end sealing of sleeve 1, be a ring-type negative pressure cavity 7 between inner chamber 6 walls of sleeve 1 and sleeve 1 outer wall, described negative pressure cavity 7 one end end edge are provided with several air suction openings 2, the other end connects an air-breathing air bag 4 by flexible pipe 3, described air suction opening 2 communicates with flexible pipe 3 and air-breathing air bag 4, air-breathing air bag 4 is provided with two mouths, makes air suction opening 2 suck dust and dust can not dispelled.

During use; chalk 5 is packed in the inner chamber 6 of sleeve 1; holding sleeve 1 outer surface writes; avoided hand skin directly to contact with chalk 5; owing between inner chamber 6 walls and sleeve 1 outer wall, be provided with a negative pressure cavity 7 and air suction opening 2; can suck dust while writing by pushing air-breathing air bag 4; reduced dust to user's health harm and to the influence of environment; because the protective effect of sleeve 1; can prevent that long chalk from fractureing and short and small chalk be difficult for to grip and abandoning and wasting phenomenon of causing is safe and convenient to use.

Claims (1)

1. dustproof chalk sleeve, it is characterized in that, comprise the chalk sleeve body that constitutes by sleeve, flexible pipe and air-breathing air bag, described sleeve is a double-layer cavity, the inner chamber one end opening other end sealing of sleeve is a ring-type negative pressure cavity between the internal chamber wall of sleeve and the sleeve outer wall, and described negative pressure cavity one end end edge is provided with several air suction openings, the other end connects an air-breathing air bag by flexible pipe, and described air suction opening communicates with flexible pipe and air-breathing air bag.

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