CN2060736U

CN2060736U - Blackboard eraser with means automatically absorbing the chalk dust

Info

Publication number: CN2060736U
Application number: CN 89222025
Authority: CN
Inventors: 薛振兴
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-12-20
Filing date: 1989-12-20
Publication date: 1990-08-22

Abstract

The utility model relates to a blackboard eraser with means automatically absorbing the chalk dust. The utility model has a driving wheel which is perpendicular with a felt surface; when the blackboard eraser is used for smearing blackboards, the driving wheel rotates to forward direction or to reverse direction when the blackboards are smeared; impeller wheels rotate to single direction by two groups of friction intermediate wheels; the low voltage of the need of dust suction ensures 85% powder dust to be inhaled into a casing to improve the working environment of teachers. The utility model has the advantages of no power consumption, simple structure, convenient operation, convenient manufacture and convenient popularization.

Description

Blackboard eraser with means automatically absorbing the chalk dust

A kind of improved automatic dust-absorption eraser belongs to the assistant product technical field of writing or paint.

The use ordinary blackboard eraser is coated with the writing on erasing the board, and can cause dust from flying.For this reason, people have done improvement.A kind of improvement is to be power with the micromachine, drives the small fan rotation and forms low pressure, will store in the dust inspiration blackboard eraser housing.The another kind of improvement is the special housing of design, utilizes the wind-force that causes when embrocating, and dust is sucked in the housing.The former needs with battery be power, though non-consumes energy of the latter, suction is too little, and this suction depends on the movement velocity of blackboard eraser, and when slowly embrocating, Chang Buneng sucks dust in the housing effectively.

The purpose of this utility model is a kind of new automatic dust-absorption eraser of development, and it only needs to utilize when erasing the board without consumed power, and the frictional force of blackboard makes a driving wheel rotation, and drives an impeller rotation, can produce the required low pressure of dust suction.

The purpose of this utility model is to do forward and reverse rotation by allowing the driving wheel following left embrocate, and by two groups of friction intermediary wheels, is translated into the unidirectional rotation of impeller and realizes.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is an appearance assumption diagram of the present utility model.

Fig. 2 is the transmission system principle schematic.

Fig. 3 is this novel structure cutaway view.

Form by the felt face (10) of embrocating the writing effect, housing (1), sieve cap (12), filter cloth (11) and dust collecting system by plaing for the utility model.Dust collecting system is made up of driving wheel (2), intermediary wheel (4), (5), (6), (7), impeller (8) and blade (9) again, and they all are installed on the framework (14), and framework then is fixed in the inner chamber of housing (1).Driving wheel (2) is orthogonal with felt face (10), by the felt face is surrounded and a little higher than felt face.When erasing the board with it, at first contact should be driving wheel (2).The axis hole of driving wheel (2) is a Long Circle, and it is enclosed within on the axle (3), can be free to slide or rotate.When driving wheel slides to the left side to the right because of erasing the board, can contact with intermediary wheel (5), and drive its rotation, intermediary wheel (5) is coaxial fixing with (4), the latter and impeller are used belt transmission between (8), but impeller (8) is rotated thereupon.When driving wheel (2) slides to right side because of erasing the board left, can contact with intermediary wheel (7), and drive its rotation, intermediary wheel (7) is coaxial fixing with (6), the latter and impeller are used belt transmission between (8), but impeller (8) is rotated thereupon, but the connecting mode of belt should guarantee that in both cases impeller (8) can both be to same direction rotation.

Blade (9) is fixed on the axle of impeller (8), when it rotates, air is agitated forward, blow out by the filter cloth (11) in the place ahead and the hole on sieve cap (12), like this, just the inner chamber at housing (11) forms low-pressure area, because have some air suction openings (or dust suction slit) (15) on the felt face on the housing (1), dust just is inhaled into the inner chamber of housing (1) by these holes, and is stained with and drops on the filter cloth (11), when accumulating when a certain amount of, can be removed.

Sieve cap (12) is tightened on the housing (1), has many breeder tubes on its end face, and the air-flow that these holes bloat for blade provides and blown out passage.When the dust in the housing runs up to a certain degree, sieve cap can be screwed off, take out filter cloth, pour out laying dust, cleared up.

Housing (1), sieve cap (12) can adopt the plastics manufacturing, and driving wheel (2) can adopt cypress glue or the manufacturing of elastic-like material with intermediary wheel (5), (7), and other each wheel can adopt manufacturings such as plastics, nylon, bakelite; Felt face (10) also can adopt palm fiber or other similar material manufacturing; Housing (1) also should make its profile be convenient to use holds except that dust collecting system should be able to being held.

Dust suction desorption system of the present utility model is owing to utilize the blade rotation to produce low pressure, so rotating speed is high more, pick-up performance is just good more.The diameter of driving wheel (2) can be selected in 30-50 millimeter scope, and the diameter ratio of it and intermediary wheel (5) or (7) is about 3-6:1; Intermediary wheel (4) or (6) are about with the diameter ratio of impeller (8): 3-7:1, like this, the rotating ratio of whole drive system is about 1:9-42, when erasing the board, if each move distance is about 800 millimeter and embrocates once each second, then the rotating speed of impeller is about per second 60-300 changes, and the dust that the low pressure of its generation is enough to 85% sucks in the blackboard eraser housing, thereby has improved teacher's working environment.

The frictional force of the utility model when erasing the board drives a dust collecting system and produces high velocity air as power, forms the necessary local depression of dust suction, and pick-up performance is good, and don't consumes electric energy, and it is simple in structure, is convenient to make, and is easy to use, is beneficial to popularization.

Claims

1, a kind of improved automatic dust-absorption eraser, it is by the felt face (10) that works the effect of embrocating, housing (1), sieve cap (12), filter cloth compositions such as (11), it is characterized in that in housing, having a dust collecting system, dust collecting system is by driving wheel (2), intermediary wheel (4), (5), (6), (7), impeller (8) and blade (9) are formed, they all are fixed on the framework (14), wherein, driving wheel (2) is orthogonal with felt face (10), and a little higher than felt face (10), its axis hole is a Long Circle, be placed on the axle (3), when driving wheel (2) slides to the left side, can contact with intermediary wheel (5), and drive its rotation, intermediary wheel (5) is coaxial fixing with (4), be belt transmission between the latter and the impeller (8), when driving wheel (2) when sliding to the right side, can contact with intermediary wheel (7), and drive its rotation, intermediary wheel (7) is coaxial fixing with (6), be belt transmission between the latter and the impeller (8), but should make turning to of impeller (8) identical with the direction of intermediary wheel (4) transmission, blade (9) is fixed on the axle of impeller (8), has some air suction openings (15) on felt face (10).

2, automatic dust-absorption eraser according to claim 1, the diameter that it is characterized in that driving wheel (2) is the 30-50 millimeter, the rotating ratio between it and the impeller (8) is about 1:9-42.

3, automatic dust-absorption eraser according to claim 2 is characterized in that driving wheel (2) and intermediary wheel (5), (7) can adopt the manufacturing of rubber elastomeric material.