CN201413541Y

CN201413541Y - Coin truth detecting device

Info

Publication number: CN201413541Y
Application number: CN2009201540355U
Authority: CN
Inventors: 吕冰
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-05-08
Filing date: 2009-05-08
Publication date: 2010-02-24
Anticipated expiration: 2019-05-08

Abstract

A coin truth detecting device includes: a ring-shaped magnetizer arranged in a non-guide magnetic and inverted V-shaped coil channel; and a photoelectric sensor is arranged in the middle of the ring-shaped magnetizer and an electromagnetic valve below, wherein left and right sides of the coil channel below the magnetizer are respectively provided with one electromagnetic valve, the electromagneticcontrol valve is electrically connected with a microprocessor; the ring-shaped magnetizer is wound with a coil; a capacitor is connected in series between the coil and an exciting frequency signal generator to form an LC resonant circuit, the frequency of which is equal to or close to the characteristic frequency of the coin; one side of the ring-shaped magnetizer is provided with an opening theopenness of which is slightly larger than the thickness of the coin; and the opening is connected with the coil channel. The coin truth detecting method is characterized by simple structure and high resolution.

Description

A kind of coin true and false pick-up unit

Technical field

The utility model relates to a kind of pick-up unit of discerning the coin true and false.

Background technology

Coin has that material is hard, the high characteristics of access times in the process of circulation, it is the currency commonly used during people live, but in use often perplexed (mainly being the monobasic counterfeit money) by counterfeit money, occasions such as present bus, automatic vending machine, public telephone have all been set up the coin receiver that the value of money that inserts coin and the true and false are judged, but it is unsatisfactory to detect effect, has therefore brought very big economic loss to country every year.

The Renminbi coin forms by multiple metal alloy compositions is synthetic, is example with the monobasic coin, different metals such as iron content, carbon, aluminium, nickel wherein, and wherein how many ratios of various materials is the secret of country.Because the coin fake producer does not understand the various material ratios and the manufacturing process of genuine note, just on size, weight, pattern, imitate, therefore, it is the true and false effective means of identification that material detects.In the physics field, the electromagnetic property of different metal material is different, coin is placed the magnetic field of certain frequency, can in the induction receiving coil, present different inductance value, invent various test format with this principle design, solved coin inspection pseudo problem, obtained certain effect.

Be used for the pseudo-scheme of coin material inspection at present and conclude two kinds, a kind of is eddy current detection method, this method is the AC signal that adopts the plane eddy current coil and feed certain frequency, when coin produces eddy current when the coil in coin, detect the variable effect of eddy current, thereby realize that the coin inspection is pseudo-the planar coil reactance.This method requires coin must be close to magnetic test coil, and to the status requirement strictness of coin and coil, it is very complicated therefore to make that pick-up unit implements, and manufacturing cost is higher, and is difficult to realize dynamically detecting fast, and is therefore also impracticable.Another kind is to adopt the twin coil detection method, be about to two coil relative fixed and place, one feeds the certain frequency interchange as excitation, and another is used for signal and receives, when coin therefrom through out-of-date, the induced signal voltage magnitude of receiving coil changes, and according to the true and false of this voltage signal size detection coin, this method advantage on detecting is that speed is fast, but it is very low that shortcoming is a discrimination, reason is that induced signal is on the weak side, and some true and false coin signal is difficult to distinguish, and is therefore in use also unsuccessful.In addition, in the bank's Coin sorting packaging facilities that has, accomplished that the use magnetizing coil constitutes magnetic circuit and is used for different value of money coin recognizing method, but still not have to find coin very/false material examine pseudo-aspect the report of success.

Summary of the invention

Order of the present utility model is to provide a kind of coin true and false pick-up unit, and it has the effect that recognition capability is strong, accuracy rate is high, simple, quick, reliable, practical.

For achieving the above object, the coin true and false pick-up unit that the utility model provides comprises:

One annular magnetizer places a non-magnetic conduction and is in the middle of the chevron shaped coin road, and the coin road of its below each side is provided with a solenoid valve, and this solenoid valve is electrically connected with microprocessor;

Annular magnetizer with below solenoid electric valve in the middle of be provided with a photoelectric sensor;

Be wound with coil on this annular magnetizer, and be connected in series an electric capacity between this coil and the excited frequency signal generator and constitute the LC resonant circuit; The frequency of this this resonant circuit equates with the characteristic frequency of coin or is close;

Side at this toroidal magnet is provided with an opening, and the aperture of this opening is slightly larger than the thickness of coin; This opening is connected with the coin road.

In an embodiment of the present utility model, its sectional area of the opening on the toroidal magnet is less than coin diameter.

In an embodiment of the present utility model, the cross section of toroidal magnet is circular.

In an embodiment of the present utility model, the excited frequency signal generator is a microprocessor.

In an embodiment of the present utility model, the coin road is that plastics or pmma material are made.

Advantage of the present utility model is:

1) simple in structure: as long as coin is placed the detection electromagnetic circuit, because it is not the magnetic conductor cross section is significantly less than coin diameter, therefore, strict to the relative position requirement in coin and magnetic conductor cross section, damaged coin, dirt coin are not all influenced testing result, improved the coin recognizing method ability simultaneously.

2) antijamming capability is strong: the frequency of excitation AC signal has very big influence to coin inspection puppet, owing to adopt microprocessor to produce pumping signal, has exempted oscillator parameter that general electron device constitutes and has been subjected to environmental factor such as temperature to change the influence that frequency is produced.

3) recognition capability is strong: because testing circuit is operated in resonant condition, the detectable voltage signals amplitude can reach hectovolt, and true and false coin signal difference obviously is convenient to circuit and microprocessor processes.

Description of drawings

Fig. 1 is the structural representation of coin true and false pick-up unit of the present utility model;

Fig. 2 is the structural representation of Sensor section among Fig. 1;

Fig. 3 is the work synoptic diagram of coin true and false pick-up unit of the present utility model;

Fig. 4 is the electric former line of reasoning synoptic diagram of coin true and false pick-up unit of the present utility model;

Fig. 5 is other peripheral electric principle schematic of coin true and false pick-up unit of the present utility model;

Fig. 6 is the microprocessor program schematic flow sheet of coin true and false pick-up unit of the present utility model.

Embodiment

Coin true and false pick-up unit of the present utility model mainly is that the vertical drop passage after placing the coin input has been installed a sensor, designed in vertical channel and met coin mechanism, the effect that meets coin mechanism is the position of control coin and sensor and the whereabouts of control coin.Meet coin mechanism and mainly constitute, be provided with photoelectric sensor in the detection position simultaneously, be used for having judged whether coin by two controllable solenoid valves.After testing circuit was judged the coin true and false, a corresponding solenoid valve shrank, and abdicates its whereabouts passage, and genuine note and counterfeit money fall into coin-accepting box separately respectively.

Simultaneously as complete pick-up unit, designed is the embedded intelligence testing circuit of core with the microprocessor, and design write corresponding software, and the function of this part comprises the insert coins detection comparison process etc. of control, coin counting demonstration, counterfeit money audio alert and coin resonant circuit of collection and processing, the coin of storing memory, the simulating signal of generation, the genuine note characteristic parameter of excited frequency signal.

The utility model adopts the high permeability material object to constitute closed magnetic circuit, in closed magnetic circuit, have the opening that coin passes through, telefault in the magnetic circuit and electric capacity constitute resonant circuit, resonance frequency is the characteristic frequency relevant with genuine note, when genuine note and counterfeit money are placed magnetic circuit respectively, the voltage magnitude that exchanges resonance signal is obviously different, and then judges the coin true and false of input; Of the present utility model it is characterized in that:

1, ferrite high permeability material looping loop, loop have one can be by the opening of coin, and the loop constitutes closed magnetic circuit by magnetic conductor, coin and very little air air gap.Because annular solid has adopted high permeability material, and the air air gap is very little, therefore make that the magnetic induction density of toroid is very strong, make therefore also when coin material changes, (to refer to true and false coin) that the variation of magnetic circuit magnetic flux is fairly obvious.

2, be wound with a coil on the magnetic conductor that permeability magnetic material constitutes, this coil and electric capacity constitute series resonant circuit in circuit.Because circuit working in resonant condition, makes the coil two ends present very high voltage, the amplitude of actual working state voltage can reach hectovolt, therefore makes the resolution that detects coin greatly improve.

3, excitation AC signal size and frequency are produced by microprocessor, and the signal of exporting by Microprocessor Interface is connected with series resonant circuit through driving circuit, and the accumulation signal frequency that this method produces has high stability.The present pumping signal of using that pick-up unit adopted all comes from the oscillatory circuit of electron device composition and realizes that its electron device is vulnerable to the influence of factors vary such as temperature, makes pick-up unit be difficult to operate as normal.

4, in the detecting sensor of being invented, the diameter of coin is obviously greater than close coin magnetic conductor cross-sectional area.Its objective is that in testing process tested coin is easy to cover and detects the magnet cross section, has therefore reduced coin and the status requirement that detects the magnet plane.

5, be circular near coin place magnetic conductor section configuration.

6, coin falls into the detection position by gravity.

Below in conjunction with accompanying drawing the utility model is done further to describe.

Fig. 1 is the structural representation of pick-up unit of the present utility model, and it has illustrated the process that coin detects simultaneously.When coin 3 enters near vertical coin road from coin slot 8 by gravity after, will be blocked by solenoid valve telescopic section 5, coin meeting this moment shading light electric transducer 6, photoelectric sensor is given microprocessor with signal, judge through program to have had coin and entered testing process, when program judge very/promptly send steering order behind the smash, if after judging is genuine note, then the genuine note passage is opened in solenoid valve action in left side, and genuine note is fallen to the left; Otherwise counterfeit money will fall to the right.

This device main body support structure part 7 is " people " font, adopt non-magnet materials such as plastics, organic glass to be made, purpose is to be used for fixing sensor and solenoid valve and the coin road of formation from the coin slot to the coin discharge, the width in coin road is greater than coin diameter (for example about 30mm), the centre distance of two electromagnet is less than the diameter (for example about 15mm) of coin, and coin road, the left and right sides and horizontal direction are held certain included angle (for example about 45 °)

Fig. 2 shows the structure of the coin detection sensor part in the pick-up unit of the present utility model, this Sensor section is to constitute sensor main body by annular magnetizer 1 and a coil 2 that high permeability material is made, side at annular magnetizer has an opening 4, (for example 3mm～4mm) is slightly larger than the thickness (for example about 2mm) of coin 3 to the aperture of opening 4, coin enters opening during detection, and the diameter of coin 3 (for example about 25mm) is greater than the long-pending (8mm～12mm) for example of the round section of opening 4.

Do not have at annular magnetizer 1 to be wound with coil on the side of opening, coil feeds the AC signal of assigned frequency, this AC signal produces alternating magnetic field in closed magnetic circuit, coin also is in the magnetic field during detection, when coin material not simultaneously, the magnetic flux in magnetic field will change, the parameter that the variation of this magnetic flux can be reflected at coil inductance changes, the waveform of coil both end voltage signal is also different, and the variation that detects this voltage waveform can distinguish true/counterfeit money.

Fig. 3 has provided pick-up unit when work, coin 3, connects the more specific location information in coin electromagnet 9, photoelectric sensor 6, magnetic loop air gap and coin road 8.Coin is subjected to the restriction of solenoid valve telescopic section 5 after falling from coin road 8, coin is in covers detecting sensor magnet opening section place, and the shading light electric transducer notifies microprocessor to begin to detect simultaneously; After detecting end, solenoid valve gets electric contraction, abdicates the coin road coin is fallen.

Fig. 4 is the circuit for inspecting coins schematic diagram, is used for illustrating the principle of work of microprocessor and coherent detection control circuit.At first export the alternating-current pulse signal of a certain frequency by microprocessor a end, through operational amplifier A 1 is that main driving circuit is added on the series resonant circuit of being made up of inductance L and capacitor C, this inductance L is the coil 2 of Fig. 1, and L, C series circuit and R1, R2 series circuit are formed bridge circuit.After inserting coin, very corresponding/counterfeit money can (or electric capacity two ends) produce different voltage signals at the inductance two ends, after becoming differential signal, bridge circuit sends into the high input impedance differential amplifier circuit of forming by operational amplifier A 2, A3, A4, after the analog voltage signal b that obtains after the amplification changed through A/D, B sent into microprocessor with signal.When testing result was genuine note, through triode T1 and relay J 1 control left side electromagnet 1 action, genuine note fell into left side (as shown in Figure 1) to the output signal of microprocessor by the d end; When testing result was counterfeit money, the microprocessor output signal was moved through triode T2 and the right electromagnet 2 of surveying of relay J 2 controls by the c end, and counterfeit money falls into right side (as shown in Figure 1).

Fig. 5 is that coin detects other peripheral circuit principle schematic of microprocessor.What this pick-up unit was selected for use is the AT89C196 high-performance microprocessor.Except that the peripheral testing circuit that Fig. 4 describes, this figure has provided other expanded function of this microprocessor, comprising: expand two 4 LED display circuits by 7279 chips, be used for showing the quantity and the value of money of coin; By SR9F26 speech chip and LM386 audio amplifier circuit, designed voice warning circuit, be used for pointing out the person of inserting coins to use genuine note; E2PROM is used for storing the characterisitic parameter of genuine note, is used for when detecting and actual signal compares, and determines the true and false of coin.

Fig. 6 is the microprocessor program process flow diagram, and the program process of said process has been described.

The utility model is examined pseudo problem at coin, is its principal character with closed magnetic circuit in conjunction with resonant circuit, and adopting special open annular magnetic conductor is that a kind of brand-new coin that core component is realized is examined pseudo-sensing device.

Claims

1, a kind of coin true and false pick-up unit is characterized in that, comprising:

One annular magnetizer places a non-magnetic conduction and is in the middle of the chevron shaped coin road, and the coin road of its below each side is provided with a solenoid valve, and this solenoid electric valve is electrically connected with microprocessor;

Annular magnetizer with below solenoid valve in the middle of be provided with a photoelectric sensor;

Be wound with coil on this annular magnetizer, and be connected in series an electric capacity between this coil and the excited frequency signal generator and constitute the LC resonant circuit, the frequency of this resonant circuit equates with the characteristic frequency of coin or is close;

2, coin true and false pick-up unit as claimed in claim 1 is characterized in that, its sectional area of the opening on the toroidal magnet is less than coin diameter.

3, coin true and false pick-up unit as claimed in claim 1 or 2 is characterized in that, the cross section of toroidal magnet is circular.

4, coin true and false pick-up unit as claimed in claim 1 is characterized in that, the excited frequency signal generator is a microprocessor.

5, coin true and false pick-up unit as claimed in claim 1 is characterized in that, the coin road is plastics or pmma material.