[申请号]01212099.5 [技术内容]本实用新型是一种粉笔书写后能自动擦字、省时省力无粉尘污染的全自动无尘环黑板。属国内首创,是传统黑板的更新换代产品,它克服了传统黑板用人工擦字,以及粉笔末到处飞扬造成污染引起师生患咽炎、肺 [Application No.] 01212099.5 [Technical contents] The utility model is an automatic dust-free ring blackboard which can automatically wipe words after writing, saves time, effort and dust-free pollution. Is a domestic initiative, is the replacement of the traditional blackboard products, which overcomes the traditional blackboard with manual rubbing, as well as flying chalk everywhere caused pollution caused by teachers and students suffering from pharyngitis, lung