Dust-suction-type blackboard eraser

Abstract

The invention provides a dust-suction-type blackboard eraser which is provided with a frame body. A central groove is formed in the frame body, and an erasing piece used for erasing words written withchalks is fixed into the central groove. A rear cover is fixed to the back portion of the frame body, and the position between the outer wall of the central groove and the inner wall of the frame body is filled with a dust-suction piece arranged between the frame body and the rear cover. A controllable-type water storage device communicating with the interior of the frame body is arranged on theframe body, and adjusting of the dust-suction capacity of the dust-suction piece is achieved by adjusting the controllable-type water storage device. According to the dust-suction-type blackboard eraser, by arranging the controllable-type water storage device communicating with the interior of the frame body on the frame body and by adjusting the controllable-type water storage device to achieve adjusting of the dust-suction capacity of the dust-suction piece, dust is adsorbed by the dust-suction piece in the erasing process, the rear cover and the frame body are of a clamped structure, replacing of the dust-suction piece is facilitated, and recycling can be achieved after replacing; and the structure is simple, operation is convenient, the service life is long, and the dust reducing effect is good.

Description

technical field [0001] The invention belongs to the technical field of teaching tools, and in particular relates to a vacuum-type blackboard eraser. Background technique [0002] "One piece of chalk, three feet of podium" is a sincere praise for teachers. However, there are many hidden dangers behind the praise. It takes about 40 years for a classroom to stand on the podium and retire. Most of the time in life must "eat chalk" "Ash", and although chalk is non-toxic, the dust particles have a strong ability to adsorb germs. Harmful germs and alkaline substances have a great impact on the lungs, respiratory system, skin, ears, nose, and throat of teachers and students. In addition, when the metals and heavy metals contained in the dust are inhaled by the human body, they will cause harm to the human liver, kidneys and other organs. At present, although schools promote multimedia primary schools, it is still unavoidable for teachers to use chalk blackboard writing in class. , ...

AI Technical Summary

Problems solved by technology

[0002] "One piece of chalk, three feet of podium" is a sincere praise for teachers. However, there are many hidden dangers behind the praise. It takes about 40 years for a classroom to stand on the podium and retire. Most of the time in life must "eat chalk" "Ash", and although chalk is non-toxic, the dust particles have a strong ability to adsorb germs. Harmful germs and alkaline substances have a great impact on the lungs, respiratory system, skin, ears, nose, and throat of teachers and students. In addition, when the metals and heavy metals contained in the dust are inhaled by the human body, they will cause harm to the human liver, kidneys and other organs. At present, although schools promote multimedia primary schools, it is still unavoidable for teachers to use chalk blackboard writing in class. , it is necessary to improve

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