2. A pile of genuine and fake coins can be distinguished by the machine invented by Zhou Yongqian, the inventor of Xuzhou. The machine consists of three parts: shell, voice prompt monitoring and memory probe, of which memory probe is its core. According to reports, the memory in the probe can instantly identify weight, volume, metal composition and so on. Coins in contact. Because there is a gap between real money and counterfeit money in these aspects, the result will naturally be different when facing the machine. ?
3. The metal raw materials of 1 yuan, 5-angle and 1 angle coins issued in China are special alloys specially used for coinage, so when it enters the magnetic field generated by a specific high-frequency oscillation circuit composed of inductors and capacitors through the coin entrance, the differences in metal materials and volumes have slightly different effects on the inductors, and the changes in the inductors cause the changes in the oscillation frequency; Then, by detecting the change of frequency and comparing it with the set value, the type of coin is determined, and the frequency signal is changed into a voltage signal through a narrow-band frequency selection circuit to complete the identification of metal coins.
There are many kinds of metal coin recognizers, but there are basically two kinds of coin saving and coin returning: one is flat coin saving and electromagnetic valve coin returning; The other is cylindrical coin storage, and the stepping motor sends back coins. When coins are put in, the counterfeit money and foreign matter are discharged after recognizing the electric signal, and the real coins are distributed to different coin storage cavities by several groups of electromagnetic valves distributed according to the face value for standby. After receiving the electric signal of coin return and change, the lower coin in the coin storage cavity is pushed out through the pull rod of the electromagnetic valve or the coin return motor according to the electric signal program, thus completing the coin return and change functions of the vending machine.
4. 1. Identification principle?
Main identification indicators: diameter, material and thickness. ?
Use air-core coil or magnetic core coil to measure materials by electromagnetic method. There is only one coil group, and there are six common coil groups. In the working state, the coil and its peripheral circuits will oscillate at a specific frequency (if there are multiple coils, the frequency will be different). When the coin passes through the coil plane vertically or parallel (different products have different ways), the oscillation frequency will change. The amplitude and direction of frequency change (increase or decrease) caused by different materials are also different. After recording the changing characteristics of a coin, it will become the basis for identifying the coin in use. ?
There is nothing special to measure the thickness. In fact, this indicator is measured together with the material. Because even coins of the same material have different thicknesses and different frequency changes. ?
Diameter-Old-fashioned identification devices used photoelectric cell arrays to identify the diameter. If the arrangement and combination are proper, the recognition accuracy is not low (0.5mm can be answered). The new ones are all measured by eccentric or irregular coils, and the coins with small diameters overlap the coils less, which also brings different frequency changes.