A movable hanging blackboard eraser

Abstract

A movable suspension type blackboard eraser comprises a blackboard eraser body and a slideway arranged on the edge or side edge of a blackboard. The blackboard eraser body is provided with a groove, a felt layer is disposed in the groove, connecting pieces are positioned at one end or two ends of the blackboard eraser body, the blackboard eraser body is connected with the slideway through the connecting pieces, a telescopic part is disposed between the blackboard eraser body and the slideway, one end of the telescopic part is connected with the blackboard eraser body, and the other end of the telescopic part is connected with the connecting pieces. Through a dust box and a suction fan, plenty of dust can be adsorbed; through the arrangement of a universal pipe, the position of an air suction port on the universal pipe can be changed randomly, and the position with a best adsorption effect is obtained according to actual conditions; through a dust sensor, when the dust is detected, the suction fan is automatically controlled to be started; through the arrangement of an independent power supply, the shortcoming of limited power supply connection is overcome, and the independent power supply can be directly replaced after being used.

Description

technical field [0001] The invention relates to the field of teaching appliances, in particular to a movable hanging blackboard eraser. Background technique [0002] At present, the manual blackboard erasers of various schools are almost all made of bristles, flannelette, felt and other materials. Since the effective wiping surface area of ​​the blackboard eraser is smaller than that of the blackboard, and the back of the blackboard eraser must be held by hand during use, therefore There is a lot of dust generated during use, and the top and edge of the blackboard are difficult to touch. Although various electric blackboard erasers are labor-saving and fast, they have disadvantages such as high cost, difficult storage, and the need to connect to a wired power supply. [0003] Moreover, the existing blackboard eraser will generate a large amount of spilled dust during use, which will cause very large bodily harm to the user. Contents of the invention [0004] The technical...

AI Technical Summary

Problems solved by technology

[0002] At present, the manual blackboard erasers of various schools are almost all made of bristles, flannelette, felt and other materials. Since the effective wiping surface area of ​​the blackboard eraser is smaller than that of the blackboard, and the back of the blackboard eraser must be held by hand during use, therefore There is a lot of dust generated during use, and the top and edge of the blackboard are difficult to touch. Although various electric blackboard erasers are labor-saving and fast, they have disadvantages such as high cost, difficult storage, and the need to connect to a wired power supply.

[0003] And existing blackboard eraser can produce a large amount of spilled dusts when using, and user is caused very big bodily harm

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