Self-cleaning eraser

Abstract

The invention relates to the technical field of teaching and in particular discloses a self-cleaning eraser. The self-cleaning eraser comprises a box body, wherein the box body is divided by a layering plate into upper and lower ends, a water tank is arranged in the middle of the upper end of the box body, a water control device is arranged in the water tank, the water control device comprises a horizontal plate and a vertical pipe arranged on the horizontal plate in a penetrating manner, the horizontal plate divides the water tank into upper and lower layers, the bottom of the vertical pipe communicates with the lower layer, the top, penetrating through the top of the water tank, of the vertical pipe is connected to a switch button, a side surface water inlet is formed in a position, located in the upper layer of the water tank, of the vertical pipe, a baffle piece capable of controlling the side surface water inlet to open or close rotatably is arranged in a position, located at theside surface water inlet, of the vertical pipe, the baffle piece is connected to a switch rotary knob, and a plurality of water through holes and one-way water return holes which convey water upward are formed in the bottom of the water tank.

Description

technical field [0001] The invention relates to the field of teaching technology, in particular to a self-cleaning blackboard eraser. Background technique [0002] Blackboard eraser is a common item in the existing teaching field. It is generally used to facilitate teachers to clean the chalk characters on the blackboard. It is easy to use and high in efficiency. However, when the existing blackboard eraser is used, chalk dust will be produced, and part of the chalk dust will be adsorbed on the blackboard. If you wipe it, as time goes by, the chalk dust will accumulate more and more, and the sponge or felt cloth at the bottom of the blackboard eraser can no longer effectively absorb it, which greatly reduces the wiping ability of the blackboard eraser, and will also make the chalk dust fly. The poison spreads to the entire classroom, and enters the body in the breath of teachers and classmates. After long-term accumulation, it seriously affects the health of teachers and cla...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the blackboard eraser in the prior art cannot clean the wool easily and effectively, and propose a simple and effective self-cleaning blackboard eraser

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