The utility model discloses a dust-absorbing blackboard eraser, which comprises a shell and a wipe cloth. The wipe cloth is provided with a shell. There are also channels, air holes, filter slots, filters, vacuum cleaners, air inlets and air outlets in the shell. The channels are hollow rings at the top of the shell; the air holes are provided with a shell side and connected to the passages from the bottom of the shell. The filter slot is located between the channel and the vacuum cleaner, with 2 5; the filter plate is located in the filter slot, corresponding to 2 5; the vacuum cleaner is located in the middle of the shell, and the inlet and outlet are connected with the vacuum cleaner. The utility model absorbs chalk dust by stages and adopts a wet filter to absorb more effectively, has better dust-proof effect, is also easy to clean, prevents the flying of solid dust, is extremely convenient to use, and is conducive to popularization and application.
【技术实现步骤摘要】
一种吸尘黑板擦
本技术涉及教学用具领域,特别涉及一种吸尘黑板擦。
技术介绍
粉笔是日常生活中广为使用的工具,一般用于书写在黑板上。古代的粉笔通常用天然的白垩制成,但现今多用其他的物质取代。粉笔的成分是硫酸钙的一种白色沉淀物,不容易被分解,颗粒比粉尘大。通过测试,教室粉笔尘浓度为1.82~21.7mg/m3,此浓度高于作业场所10mg/m3的卫生标准,且教师作业点与教室前排浓度明显高于中间与后排。分散度测定结果表明粉笔尘分散度较高,教师作业点处粒径小于5um的微粒占7215%,前排位与中排位处的粉笔尘分散度较讲台处高,小于5um的粒子几乎达到总尘粒的90%。教师常需在黑板上书写、绘图进行讲解。在45~50分钟的一节课里,就要擦写数次,下课时,往往在手上、袖子上,甚至头发、肩膀上都留下一层白色粉笔灰。天天如此,年复一年,工作20~30年后,消磨了数以万计的粉笔。不可避免地从鼻孔吸入一些粉笔灰。相关研究表面,粉笔尘对肺、呼吸道、眼睛、皮肤、耳均有危害。以肺最为常见,在教学过程中,粉笔灰很容易被吸入肺,多数被阻留在肺泡内,经过一系列的刺激,化学和免疫的作用便可造成肺部损失,包括呼吸系统炎症和肺通气功能下降,常见的肺部疾病有:慢性、急性肺炎、肺癌、尘肺病等(即粉笔粉尘中含有二氧化硅,被吸入肺部,在肺部游离的二氧化硅含量在百分之一以上形成肺纤维化的粉尘,从而使肺泡纤维化,导致肺部呼吸功能下降);粉笔粉尘进入肺的途径是通过上呼吸道包括鼻、咽、支气管,在这一过程中,部分粉尘会停留于上呼吸道,对粘膜上皮细胞产生机械刺激和损坏,长期在这种环境下工作,会引起一系列的病变,其中对 ...
【技术保护点】
1.一种吸尘黑板擦,包括壳体和擦布,所述擦布设有壳体内,其特征在于:所述壳体内还设有通道、气孔、过滤插槽、过滤片、吸尘器、进气口和出气口,所述通道为中空环设于壳体顶端;所述气孔设于壳体侧面,从壳体底端连接到通道;所述过滤插槽设于通道和吸尘器之间,设有2‑5个;所述过滤片设于过滤插槽内,对应设有2‑5级;所述吸尘器设于壳体中部,所述进气口和出气口于吸尘器连接。
【技术特征摘要】
1.一种吸尘黑板擦,包括壳体和擦布,所述擦布设有壳体内,其特征在于:所述壳体内还设有通道、气孔、过滤插槽、过滤片、吸尘器、进气口和出气口,所述通道为中空环设于壳体顶端;所述气孔设于壳体侧面,从壳体底端连接到通道;所述过滤插槽设于通道和吸尘器之间,设有2-5个;所述过滤片设于过滤插槽内,对应设有2-5级;所述吸尘器设于...
还没有人留言评论。发表了对其他浏览者有用的留言会获得科技券。