Dust collecting chalk sleeve

Abstract

The invention discloses a dust-absorbing chalk cover, which comprises a hollow casing and a dust-absorbing tube. The dust-absorbing tube is sleeved on the outside of the hollow casing. There is also a dust suction chamber on the outside of the dust suction pipe, and a piston is arranged on the top of the hollow sleeve. The piston is in sealing and sliding contact with the dust suction chamber. The outer wall of the dust suction pipe is sealed with a sealing rubber ring, and a detachable dust filter chamber is arranged outside the lower part of the dust suction chamber. The dust-absorbing chalk case of the present invention does not need power consumption, is very light and handy, and at the same time, the written characters can be softer.

Description

technical field [0001] The invention relates to the field of teaching appliances, in particular to a dust-absorbing chalk cover. Background technique [0002] When teachers write on the blackboard in class, they mostly hold chalk in their hands, and their hands are in close contact with the chalk. After a long time, due to the material of the chalk and other reasons, it will cause damage to the skin of the fingers; for this, some teachers will use The chalk cover puts the chalk in it, and then writes by holding the chalk cover, so that the chalk can be prevented from causing damage to the hand. In addition, in order to further improve the function of the chalk case, some chalk cases that can absorb chalk dust have appeared in the prior art. This type of chalk case is realized by setting a negative pressure fan in the chalk case; The advantage is that the dust generated during writing can be sucked into the chalk case to prevent the dust from being sucked into the lungs. Ye...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this type of dust-absorbing chalk case is: due to the built-in fan and power sup

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