a blackboard

Abstract

The invention discloses a blackboard. The blackboard comprises a blackboard body, a sliding frame, an eraser base, an eraser body, a collection groove, a water storage cavity, an ejector rod, a first drive mechanism, a second drive mechanism and a control device; the positions, located on the left side, the right side and the upper side of the eraser body, of the eraser base are each provided with a first rubber piece body, the collection groove is connected to the lower side of the eraser base, the water storage cavity is formed in the eraser base, a water permeating hole is formed in the lower side of the eraser base, a diaphragm component is arranged on the water permeating hole, and is composed of a pair of second rubber piece bodies, the middle portions of the second rubber piece bodies are overlapped, and the ejector rod is arranged in the collection groove; when the front side wall makes tight contact with the blackboard body, the blackboard body abuts against one end of the ejector rod in an ejecting manner, the other end of the ejector rod exerts pressure to the diaphragm component, and the middles of the second rubber piece bodies are separated; the control device controls the first drive mechanism and the second drive mechanism to alternatively work. Automatic wiping of chalk writing marks on the blackboard body can be achieved.

Description

technical field [0001] The invention relates to a blackboard. Background technique [0002] Although electronic whiteboards are increasingly used in the field of classroom teaching, it is a time-consuming and laborious task to completely replace the equipment, and blackboards are still the most commonly used teaching aids. Especially for some teachers with many years of teaching experience, chalk writing on the blackboard has almost become an important part of their teaching. But the inconvenience of the traditional blackboard is that at the end of each class, or before writing on the blackboard needs to be rewritten, the chalk writing on the blackboard needs to be manually erased. On the one hand, it is a waste of time, and on the other hand, chalk dust is also likely to have adverse effects on human health. Contents of the invention [0003] The present invention designs and develops a kind of blackboard. [0004] The technical scheme provided by the invention is: ...

AI Technical Summary

Problems solved by technology

But the inconvenience of the traditional blackboard is that at the end of each class, or before writing on the blackboard needs to be rewritten, the chalk writing on the blackboard needs to be manually erased

On the one hand, it is a waste of time, and on the other hand, chalk dust is also likely to have adverse effects on human health.

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