CN2057147U

CN2057147U - Electrostatic dust adsorption blackboard eraser

Info

Publication number: CN2057147U
Application number: CN 89202983
Authority: CN
Inventors: 杨滨
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-03-16
Filing date: 1989-03-16
Publication date: 1990-05-16

Abstract

The utility model relates to an electrostatic dust adsorption blackboard eraser, comprising a cellulosic fluff brush surface, a brush cover, a dust collecting box and an electrostatic high-voltage circuit. The utility model utilizes high-voltage static electricity generated by the electrostatic high-voltage circuit on the brush surface when the electrostatic high-voltage circuit is in use to efficiently and cleanly collect chalk dust which is erased into the dust collecting box automatically. The utility model has the advantages of compact eraser body structure, scientific design, replaceable brush surface and long service life, and is an economic, sanitary, ideal and novel blackboard eraser.

Description

Electrostatic dust adsorption blackboard eraser

The electrostatic precipitation blackboard eraser is a kind of culture and education apparatus of light, health.

Known ordinary blackboard eraser, by fine hair brush finish and brush shell form, easy economy, but in use, dust from flying, very unhygienic.In order to address this problem, normally adopt the blackboard eraser that has electric dust collector, notification number is that the utility application that GG86 2 09589, name are called " electric dust-less blackboard wiping " is exactly an example of this class blackboard eraser, though electric dust absorption blackboard eraser energy dust suction, but when using, the noise that produces can disperse teachers and students' notice, thereby is not suitable for using on the classroom.

Purpose of the present invention is exactly to invent a kind of electrostatic precipitation blackboard eraser that uses light, noiseless, can efficiently adsorb dust.

The task of invention is finished like this.Be covered with in a slice on the metal decking of dust suction hole, enclose the brush finish of dedusting fine hair, and Setup Controller, device electrostatic high-pressure circuit and chalk dust dust-collecting box in the brush shell under the metal decking, when erasing the board, the fine hair of brush finish is wiped writing under external force, meanwhile the controller pressurized under the brush finish starts the electrostatic high-pressure circuit, and on metal decking, produce high-pressure electrostatic, chalk dust dust suction hole by brush finish under the suction-operated of high-pressure electrostatic is inhaled in the dust-collecting box, because during the electrostatic high-pressure circuit working is noiseless, so both overcome the dust pollution when ordinary blackboard eraser uses, avoided the deficiency of electric dust absorption blackboard eraser work noise again, made the electrostatic precipitation blackboard eraser become the desirable culture and education apparatus of a kind of health.

The electrostatic high-pressure circuit is made up of astatic multivibrator, driving amplifier, high-tension transformer and high voltage silicon rectifier stack.The output signal of astatic multivibrator is amplified through driving amplifier, transformer boost and the high voltage silicon rectifier stack rectification after, at the DC voltage that produces on the metal decking kilovolt, thereby reached the purpose of utilizing high-pressure electrostatic absorption chalk dust.

Below we will the present invention is further detailed explanation in conjunction with the accompanying drawings.

Fig. 1 is the circuit theory diagrams of an embodiment of the utility model.

Fig. 2 is the appearance assumption diagram of an embodiment of the utility model.

Fig. 3 is the internal structure schematic diagram of Fig. 2, and wherein 1 is brush finish, the 2nd, and microswitch, the 3rd, metal decking, the 4th, wiring board, the 5th, high-tension transformer, the 6th, dust-collecting box, the 7th, power pack.

With reference to Fig. 1, on printed circuit board (PCB), each electronic component has formed firm electrical connection, forms the electrostatic high-pressure circuit, 555 time-base integrated circuits and resistance R in the circuit ₁, R ₂And capacitor C ₁Form astatic multivibrator and produce the square-wave pulse signal of telecommunication, its frequency of oscillation is by formula f=1.443/ ((R ₁+ 2R ₂) C ₁) decision, capacitor C ₂Be the bypass filter capacitor, the Low ESR of astatic multivibrator output, the signal of telecommunication of big electric current are through current-limiting resistance R ₃, promoting model is the power amplifier tube T of 3DD15, boost through high-tension transformer B, and model is the high voltage silicon rectifier stack commutation diode D of 2GGL again ₂Rectification just can obtain 7000 to 10 kilovolts DC voltage, utilizes diode D ₂Connection just can on metal decking N, form the positive voltage electrode, be used to adsorb chalk dust, model is the diode D of 2CN ₁Be for preventing that because of excessive counter electromotive force punctures that triode T is provided with, microswitch K then be the controller of electrostatic high-pressure circuit.

Whole electrostatic high-pressure circuit is securely fixed in the brush shell of insulation, the brush shell is a convenient cuboid that grips, it simultaneously is fixed with the metal decking N that firmly is connected with the electrostatic high-pressure circuit, between the metal decking N of brush shell outer surface and insulated brush shell, a gap that communicates with dust-collecting box is arranged, the chalk dust of absorption is collected in the dust-collecting box by this gap, metal decking N appearance is the brush finish of interchangeable cellulosic fine hair, brush finish is connected the outer surface that covers metal decking N by velcro, like this when the fine hair brush finish that is covered with the dust suction hole is damaged, the just brush finish that can more renew easily, do not cause breakage to influence erasing handwriting and pick-up performance because of brush finish, thereby prolonged the service life of electrostatic precipitation blackboard eraser, microswitch K is installed in appropriate location under the brush finish, the duty of control electrostatic high-pressure circuit, when brush finish is wiped writing under external force, microswitch K pressurized, make the electrostatic high-pressure circuit working, the chalk dust of in time efficiently brush finish being wiped sucks, be collected in the dust-collecting box, dust-collecting box in the brush shell has a cover to be opened/closed or is drawer type, can open easily at any time or take out, remove the dust in the box, in the brush shell, can install dc source, for the electrostatic high-pressure circuit provides working power.Electrostatic precipitation wiping blackboard structure compactness, design science is used lightly, is a kind of health, desirable novel blackboard eraser.

Claims

1, electrostatic precipitation blackboard eraser, form by brush finish, brush shell, dust-collecting box, it is characterized in that: brush finish is interchangeable cellulosic fine hair sheet, brush finish lower device dust suction circuit controller and the metal decking that has the dust suction hole, device dust suction electrostatic high-pressure circuit and dust-collecting box in the brush shell, dust suction electrostatic high-pressure circuit is made up of astatic multivibrator, driving amplifier, high-tension transformer and high-voltage silicon rectifier stack.

2, according to the electrostatic precipitation blackboard eraser of claim 1, it is characterized in that: 555 time-base integrated circuits are connection and resistance R routinely ₁, R ₂And capacitor C ₁Connect and compose astatic multivibrator, the three-prong of 555 time-base integrated circuits and current-limiting resistance R ₃Connect the base stage of driving amplifier triode T after the series connection, the colelctor electrode of triode T meets elementary end of high-tension transformer B and protection diode D ₁Positive pole, the grounded emitter of triode T, the elementary other end of high-tension transformer B connects positive source behind microswitch K, an end ground connection of B the utmost point of high-tension transformer, the other end and high voltage silicon rectifier stack commutation diode D ₂Negative pole connect high voltage silicon rectifier stack commutation diode D ₂Positive pole be connected with metal decking.