A vacuum blackboard

Abstract

The invention provides a dust absorption blackboard. The dust absorption blackboard comprises a blackboard plane, a frame and a backboard, wherein a sealed space is formed by the blackboard plane and the backboard through the frame; miniature holes are fully and uniformly distributed on the surface of the blackboard plane and are communicated with the sealed space; the sealed space is divided into different cavities through division plates; an air suction pipe is arranged in each cavity; and the air suction pipe is sequentially connected to an air filtration device and a high-speed draught fan. The dust absorption blackboard is characterized in that the miniature holes are fully and uniformly distributed on the surface of the blackboard plane; the diameters of the miniature holes are in the range of 0.1-0.5mm; the area of the miniature holes occupies for 30%-70% of the area of the whole blackboard plane; and the cross sections of the miniature holes enlarge gradually in the direction of the thickness of the blackboard plane and incline downwards in the whole. The dust absorption blackboard is capable of efficiently absorbing dust generated by writing with chalk, effectively suppressing raise dust generated in an erasing link, further purifying air and improving the indoor environments of a classroom.

Description

technical field [0001] The invention relates to a dust-absorbing blackboard, in particular to a blackboard capable of inhaling chalk dust, which can greatly reduce the chalk dust generated when writing on the blackboard and avoid pollution. In addition, the invention helps to purify the environment and protect the health of teachers and students. Background technique [0002] The surface of the traditional blackboard is usually wood, cement or glass, and it is erased with a blackboard eraser after writing with chalk. In the above process, chalk dust will be generated in the writing process, but more dust will be generated in the erasing process. Dust enters the air and is inhaled by the human body, which is not conducive to health. The previous vacuuming blackboard scheme paid attention to the chalk dust generated in the writing process, but did not pay attention to the chalk dust generated in the erasing process. Therefore, it is necessary to propose related improvement t...

AI Technical Summary

Problems solved by technology

Dust enters the air and is inhaled by the human body, which is not conducive to health

The previous vacuuming blackboard scheme paid attention to the chalk dust generated in the writing process, but did not pay attention to the chalk dust generated in the erasing process. Therefore, it is necessary to propose related improvement technologies to improve the effect of dust removal

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