Electric magnetic blackboard eraser

Abstract

The invention provides an electric magnetic blackboard eraser; a steel blackboard is provided with a plurality of racks on the top and the bottom; an electric motor is provided to drive a rotating shaft which has a plurality of gears; the gears are meshed with the racks; a gear box is provided outside the upper gear and the lower gear; the gear box is connected with a bracket which is connected with the magnetic blackboard eraser; the magnetic blackboard eraser consists an embedded magnet and an erasing part wrapped around the magnet, characterized in that two ends of the electric motor axle are respectively provided with a variable speed gear which is meshed with a deceleration gear; the deceleration gear is respectively connected with an upper rotating shaft and a lower rotating shaft; the upper gear is arranged at the head of the upper rotating shaft and meshed with the rack on the top; the lower gear is arranged at the head of the lower rotating shaft and meshed with the rack on the bottom. The proposal has the electric motor equipped at the middle part of the rotating shaft, and the upper rotating shaft and the lower rotating shaft provided with gears respectively; when in work, the gears and the racks are meshed with each other, thus pulling the magnetic blackboard eraser to move, and erase chalk works on the blackboard; the two ends of the electric motor have small driving load, and long service life.

Description

technical field [0001] The invention relates to an eraser for wiping blackboards, in particular to an electric magnetic eraser, which is suitable for erasing chalk characters (including water brush characters, etc.) on steel blackboards (including white boards and green boards), and belongs to teaching supplies. Background technique [0002] Blackboard is one of the commonly used tools for teaching. In recent years, green boards and white boards have been developed. The material for making blackboards has evolved from wood to steel plates. In addition to chalk, various pens have also been developed for writing pens. The blackboard is a tool that can be written repeatedly. It is very convenient to use, but wiping the blackboard is a very unhygienic thing. Dust pollutes the air, environment and hands, and wiping the blackboard is tiring. Thus, the inventor once applied for a magnetic blackboard eraser and a driving mechanism, Chinese Patent No. ZL02261127.4, which drives the b...

AI Technical Summary

Problems solved by technology

However, in the ZL02261127.4 patent, there are still the following disadvantages: first, the motor is installed at one end of the main shaft, and one end of the main shaft needs to drive two sets of gears and drag the magnetic eraser. The second is that the contact between the gear and the rack is unreasonable, and the running resistance is large, which increases the load on the motor. wipe effect

Images