CN201109319Y - 3-roller automatic blackboard eraser - Google Patents

Abstract

The utility model relates to a three-roller automatic blackboard eraser. An erasing part which is contacted with the blackboard surface is three rollers that are extruded together in parallel. The surfaces of the rollers are absorbent materials, such as sponge or woolen fabrics. A motor drives any one of rollers to rotate by a transmission device and the other two rollers do follow rotation under the function of the extrusion friction force. Under the guide of a guide track, the blackboard eraser moves on the blackboard surface following the rolling direction of the rollers at the two sides. Water is sprayed on the three rollers by a nozzle, the middle roller plays a converse erasing role and the rollers at the two sides play wetting and wiping dry roles respectively. The three-roller automatic blackboard eraser realizes that the blackboard surface is dry and clean when wiping, the writing is clear without slip, and dusts can not appear during the writing and the wiping.

Description

Three roller automatic blackboard erasers

Affiliated technical field

The utility model relates to a kind of automatic blackboard eraser.

Background technology

Many technological innovations of wiping writing automatically about chalk writing and teaching plate are arranged for a long time, be difficult to penetration and promotion but all fail to solve because of various technical problems.For the automatic blackboard eraser of reciprocation type wet rubbing, main exist to wipe do not do and technical problem such as the wiping board time is long.

Summary of the invention

In order to solve the problems of the technologies described above, the utility model provides a kind of three roller automatic blackboard erasers.This three rollers automatic blackboard eraser can be realized promptly wiping fast promptly and to do promptly only, wipes the available chalk in back and writes immediately, can guarantee that writing is clear and it is non-slip to write, and does not have dust when wiping, and writes on little wet plate face and also do not produce dust.

The technical scheme that its technical problem that solves the utility model adopts is: three roller automatic blackboard erasers contact with board plate face wipes part, is three rollers that press together side by side.The appearance of roller is the absorbent material of sponge or wool manufacturing category.Motor drives wherein arbitrary roller turn by transmission device, and other two rollers are followed rotation under the effect of extrusion friction power, and the roller on both sides is opposite with middle roller turn direction.Under the guiding of guide rail, blackboard eraser is followed the roller on both sides along guide rail rotating direction moves on the plate face.Middle roller plays reverse scrubbing action, and the roller on both sides is born wetting respectively and dried effect.

The beneficial effects of the utility model are: it is time saving and energy saving to impart knowledge to students, and environmental protection does not have dust from flying.Having solved the quick i.e. wiping of wet rubbing automatic blackboard eraser promptly dried is clean technical problem, and mechanical realization is simple and practical, helps penetration and promotion.

Description of drawings

Below in conjunction with accompanying drawing the utility model embodiment is further specified.

Fig. 1 is three roller automatic blackboard eraser front view schematic diagrames.

Fig. 2 is three roller automatic blackboard eraser vertical view schematic diagrames.

Among the figure 1, go up lower guideway, 2, water spilage tray, 3, seat board up and down, 4, motor, 5, board plate face, 6, the blackboard eraser case, 7, left side roller, 8, left and right sides nozzle, 9, intermediate calender rolls, 10, the right roller.

The specific embodiment

In embodiment illustrated in figures 1 and 2, left side roller (7), intermediate calender rolls (9) and the right roller (10) made by sponge and flannelette parcel press together side by side, and contact with board plate face (5).Motor (4) drives intermediate calender rolls (9) and rotates by the gear drive in the water spilage tray (2).When intermediate calender rolls (9) when clockwise rotating, then left side roller (7) and the right roller (10) are driven to do by intermediate calender rolls (9) and rotate counterclockwise under the effect of extrusion friction power.Because left side roller (7) and the right roller (10) in the force of rolling friction sum on the plate face (5) greater than the force of rolling friction of intermediate calender rolls (9) on plate face (5), so blackboard eraser moves right.Left and right sides nozzle (8) is sprayed at water on three rollers, and the right roller (10) spreads upon water on the plate face (5), and chalk writing is wetting.The reverse chalk writing of wiping on the plate face (5) of intermediate calender rolls (9).Left side roller (7) is dried the water on the plate face (5).The current that have the chalk dust end that three rollers are extruded are discharged through water spilage tray (2).

Claims (2)

1. a roller automatic blackboard eraser is characterized in that its part with board plate face (5) contact is three parallel and press together rollers (7) (9) (10).

2. three roller automatic blackboard erasers according to claim 1 is characterized in that roller is wrapped in axle by absorbent materials such as sponge or wool textiles and goes up and make.

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