A kind of blackboard eraser and its using method

Abstract

The invention discloses a blackboard eraser and a using method thereof, belonging to the field of teaching tools. The blackboard eraser comprises a powder-collecting outer box, a first wiping roller, a second wiping roller, an outer wall of the first wiping roller, A powder collection cavity is formed between the outer wall of the second wiping roller and the inner wall of the powder collecting outer box, and a concentrated channel for powder rejection is formed between the outer wall of the first wiper roller, the outer wall of the second wiper roller, and the writing surface of the blackboard. It is connected with the powder collecting chamber. When the blackboard eraser moves upward along the height direction of the blackboard to wipe the blackboard, the first wiping roller will drop the chalk ash wiped from the writing surface of the blackboard to the powder throwing channel, and the second wiping roller will Shake off the chalk dust into the powder chamber. The blackboard eraser disclosed by the invention realizes that the chalk dust wiped from the writing surface of the blackboard can be blocked immediately and sent into the powder collection chamber for concentration, thereby preventing the chalk dust from leaking and fluttering to a greater extent, and being more hygienic.

Description

technical field [0001] The invention relates to the field of teaching appliances, in particular to a blackboard eraser and a method for using the same. Background technique [0002] In the process of education and teaching, the flexibility and convenience of writing on the blackboard make many teachers accustomed to using chalk on the blackboard for teaching during the teaching process, and the chalk needs to be wiped and cleaned with a blackboard eraser after writing, but the existing Most common blackboard wipers are time-consuming and labor-intensive in the process of cleaning the blackboard, which is easy to cause dust to fly, which is not only inconvenient to clean, but also poses a great threat to the health of teachers and students. Therefore, a blackboard eraser device and an automatic blackboard eraser have appeared, which can wipe chalk handwriting more conveniently. [0003] However, the existing blackboard eraser devices and automatic blackboard erasers are usua...

AI Technical Summary

Problems solved by technology

[0003] But existing blackboard eraser device and automatic blackboard eraser, its structure is usually made of outer casing and the wiping block or the wiping roller that is arranged in the outer casing, and the wiping block or wiping roller all need stretch out outer casing and contact with the writing surface of blackboard There must be a gap between the wiping block or wiping roller and the writing surface of the blackboard, between the wiping block or wiping roller and the outer casing. Floating in all directions, the chalk dust wiped from the writing surface of the blackboard cannot be sent to the chalk dust accumulation tank in time (even if a blackboard eraser with a fan is installed, it still cannot guarantee that the chalk dust that is wiped off the flying in each gap are all inhaled, and the blackboard eraser equipped with a dust suction mechanism such as a fan has a complex structure and poor stability, especially when working in an environment full of chalk dust, the motor and fan are easily stuck, and the production cost and maintenance cost are high), and the chalk dust remains It will float out from the gap between the wiping block or wiping roller and the writing surface of the blackboard and between the outer casing, and it is still unavoidable that teachers and students who are close to the blackboard eraser device or automatic blackboard eraser will inhale more chalk dust

Images