A dust-free blackboard and its matching eraser

Abstract

The invention discloses a dust-free blackboard. A blackboard body is made from a non magnetic material, through holes are densely formed in the blackboard body, the diameter of each through hole ranges from 0.3 mm to 0.5 mm, suction cups which are uniformly arranged are arranged on the rear portion of the blackboard body, each suction cup is connected with a branch pipe, the branch pipes are communicated with a main pipe through multiple collecting pipes, the main pipe is connected with an air suction pipe of an outdoor exhaust fan, and an exhaust pipe of the exhaust fan is communicated with the atmosphere; a center hole of each suction cup is a wedge-shaped hole, a guide rod is is inserted into each center hole, an O-shaped seal ring is arranged on each guide rod in a sleeving mode and matched with the corresponding center hole, and an iron suction plate is fixedly arranged on the side, close to the blackboard body, of each guide rod. A blackboard eraser which is matched with the dust-free blackboard is characterized in that multiple powerful magnets are inlaid in the side, close to the blackboard, inside a blackboard eraser body. Compared with the prior art, the dust-free blackboard and the blackboard eraser matched with the blackboard are simple in structure, good in dust removal effect and capable of fully utilizing wind suction.

Description

technical field [0001] The invention relates to the technical field of teaching aids, in particular to a dust-free blackboard and a matching eraser. Background technique [0002] The students sitting in the front row will have this experience. Every time after class, after wiping the blackboard, there will always be a lot of chalk dust in the air. In order to achieve the dust-free effect, people have tried various efforts such as using hard dust-free chalk, using electrostatic adsorption dust-free board erasers, using whiteboards without chalk, etc., but until now most classrooms in China The dust is still flying, and people still can't get rid of the chalk. How to guide the dust generated during the process of wiping the blackboard out of the classroom is the most important thing to solve the problem of division. Contents of the invention [0003] The purpose of the invention is to overcome the deficiencies in the prior art, to provide a dust-free blackboard and a matchi...

AI Technical Summary

Problems solved by technology

[0002] The students sitting in the front row will have this experience. Every time after class, after wiping the blackboard, there will always be a lot of chalk dust in the air. In order to achieve the dust-free effect, people have tried various efforts such as using hard dust-free chalk, using electrostatic adsorption dust-free board erasers, using whiteboards without chalk, etc., but until now most classrooms in China The dust is still flying, and people still can't get rid of the chalk. How to guide the dust generated during the process of wiping the blackboard out of the classroom is the most important thing to solve the problem of division

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