Circulation type double-layer self-wiping blackboard

Abstract

The invention discloses a circulation type double-layer self-wiping blackboard. The circulation type double-layer self-wiping blackboard is characterized by comprising a frame consisting of two side frames which are in mirror symmetry with each other; the frame comprises upper and lower chain wheel chain transmission mechanisms, annular groove sliding blocks, I-shaped pins, top wheels, circulating motion mechanisms, a brush, and a self-wiping device; the chain wheel chain transmission mechanisms are arranged on inner and outer sides of the side frames in a staggered way and can do synchronized motion; pins at two ends of each I-shaped pin are positioned in annular sliding grooves of the two sliding blocks respectively; the top wheels are distributed on the upper and lower sides of each I-shaped pin; each circulating motion mechanism consists of clamp wheels which can rotate with chain wheels synchronously; the brush is arranged on the median line of the frame; the self-wiping device consists of a brush keel of which two ends are provided with handles; and two blackboards are fixed on the annular groove sliding blocks through pins. The motion of the two blackboards is stably restrained by chains, the I-shaped wheels and the clamp wheels, so the functions of stable action of position change and automatic writing wiping are realized. The circulation type double-layer self-wiping blackboard comprises the circulating motion mechanisms, so the circulation type double-layer self-wiping blackboard can be applied to the working condition that two surfaces are needed to move in the vertical direction and the surfaces are needed to be changed, and a rotation drive device can be arranged to adapt to the actual requirement of engineering when necessary.

Description

technical field [0001] The invention relates to the field of teaching tools, in particular to a circulating double-layer self-erasing blackboard. Background technique [0002] Some circular double-layer blackboard designs that have appeared at present generally have a complex structure, and a special electric mechanism is needed to stably realize the surface-changing action of the two blackboards. Some also have the defect of insufficient motion constraints, and there will be shaking instability when the blackboard moves to certain positions. The circulating double-layer self-erasing blackboard can realize the exchange of the front and rear board surfaces, which can realize fast erasing of the blackboard and prevent dust from flying, and at the same time overcome some defects of ordinary non-circulating blackboards in use. For example, when the user uses the lower part of the rear panel, the position is too low, and it is inconvenient to bend or squat down. In order to mak...

AI Technical Summary

Problems solved by technology

For example, when the user uses the lower part of the rear panel, the position is too low, and it is inconvenient to bend or squat down

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