CN113611035A - Reflection-type magnetic detection device, inductive sensor, sorting system and control method - Google Patents

Abstract

The invention discloses a reflection-type magnetic detection device, an inductive sensor, a coin counterfeit distinguishing and sorting system and a control method. It is a plurality of detection coil, a plurality of excitation coil and a plurality of compensating coil carve in on the multilayer circuit board, and fixed mounting has avoided the position change between each coil in the spacing wall of casing, make inductive sensor can incline the installation, makes the coin utilize self weight to roll over the sensor, has removed the coin conveyer belt from. The reflection-type magnetic detection device adopts a plurality of coil groups, so that the reduction of the identification sensitivity is avoided, and the accuracy of coin identification is improved.

Description

Reflection-type magnetic detection device, inductive sensor, sorting system and control method

Technical Field

The invention relates to the technical field of coin identification, in particular to a reflection-type magnetic detection device, an inductive sensor, a coin counterfeit identification and sorting system and a control method.

Background

In a coin handling apparatus for performing a counterfeit discrimination and a sorting of coins, an inductive sensor for discriminating and sorting coins is used to measure magnetic characteristics of coins. The magnetic properties of the coin are measured, for example, to determine the total thickness, coating thickness, diameter and material of the coin, thereby performing coin denomination and authenticity identification.

Patent literature discloses a magnetic sensor for coin recognition, which is disclosed in patent literature with publication (publication) No. 103258365a, and which measures changes in magnetic field of both a transmission type and a reflection type using four coils. In this sensor, a reflection-type exciting coil (primary coil) and a detection coil (secondary coil), and two transmission-type exciting coils (primary coils) are arranged below a transport path, and two transmission-type detection coils (secondary coils) are arranged above a coin transported on the transport path at positions corresponding to the transmission-type exciting coils. Then, in addition to the detection of the change in the transmitted magnetic field, the change in the magnetic flux caused by the eddy current generated in the coin excited by the reflection-type exciting coil is detected by the reflection-type detecting coil.

However, in the above patent documents, there are problems that variability occurs in sensor characteristics due to manufacturing errors of respective parts constituting the coin discrimination clear-divide inductive sensor and assembly errors when the magnetic sensor is assembled by using a plurality of non-self-adhesive coils, and that processing cost is high when permalloy is used as a core plate, and the magnetic field distribution surface is small due to an opening, so that the discrimination sensitivity is lowered, and the mounting is limited, and the mounting is not easy and the cost of the conveyor belt is increased because the permalloy can be mounted only on a plane and a conveyor belt.

Disclosure of Invention

In view of the above, it is desirable to provide a reflective magnetic detection device, an inductive sensor, a coin discrimination and sorting system, and a control method that can suppress a decrease in sensor performance due to a variation in positional relationship between coils.

The utility model provides a reflection-type magnetism detection device for coin kind is clear to be divided and true and false discernment, includes the multilayer circuit board and locates in proper order a plurality of detection coils, a plurality of excitation coil and a plurality of compensating coil on the multilayer circuit board are a plurality of detection coil, a plurality of excitation coil and a plurality of compensating coil overlap from last to carving on every layer of circuit board down in proper order.

Further, the plurality of detection coils include a first detection coil and a second detection coil, the first detection coil adopts a circular coil, and the second detection coil adopts an elliptical coil.

Furthermore, the plurality of excitation coils comprise a first excitation coil and a second excitation coil, the first excitation coil is a circular coil, and the second excitation coil is an elliptical coil.

Further, the plurality of compensation coils comprise a first compensation coil and a second compensation coil, the first compensation coil is a circular coil, and the second compensation coil is an elliptical coil.

Further, the multilayer circuit board adopts a 6-layer circuit board, and the first detection coil, the second detection coil, the first excitation coil, the second excitation coil, the first compensation coil and the second compensation coil are sequentially engraved on the 1 st-6 th-layer circuit board from top to bottom; the first coil module is formed by the first exciting coil and the first compensating coil, the second coil module is formed by the second exciting coil and the second compensating coil, and the first coil module and the second coil module respectively form a PCB coil group with exciting, detecting and temperature drift compensating functions.

The inductive sensor is arranged on the coin sorting machine and comprises a fixed plate and a shell limiting wall penetrating through the fixed plate, and a reflection-type magnetic detection device is fixedly arranged in the shell limiting wall.

Furthermore, one side of the fixing plate is provided with a connecting port, and the joints of the coils of the reflection-type magnetic detection device are electrically connected to the connecting port.

And, a false clear system of dividing of coin discernment, including drive arrangement, inductance type sensor, detection authentication device, coin discernment processing module and the temperature detection sensor of electric connection in proper order:

the driving device comprises an oscillation module, a frequency selection module, a frequency mixing module and an amplification driving module which are sequentially arranged, and is used for generating a composite excitation signal for driving the inductive sensor;

the inductive sensor adopts a reflection-type magnetic detection device and is used for identifying the authenticity of the coin;

the detection and identification device comprises a filter, an amplifier, an A/D converter and a storage which are sequentially arranged, and is used for filtering and amplifying the waveform signal and the phase signal output by the inductive sensor and extracting the characteristic parameter values of the variation of the waveform signal and the phase signal;

the coin identification processing module is used for comparing the characteristic parameter value of the coin to be identified with the characteristic parameter value of the standard coin, judging the authenticity and face value of the coin to be identified and sending the authenticity and face value to different processing paths;

the temperature detection sensor is used for detecting an external temperature value and feeding back the temperature value to the coin identification processing module, so that the coin identification processing module extracts the waveform signal and the phase signal of the inductive sensor according to the temperature value for temperature compensation.

Further, the storage stores the characteristic parameter value of the standard coin as the standard value of the characteristic parameter value of the coin to be identified.

And a control method of the coin discrimination and sorting system, which comprises the following steps:

pre-storing characteristic parameter values of standard coins with various face values;

inputting the composite excitation signal into an excitation coil group of the reflection-type magnetic detection device;

passing coins to be identified over a reflective magnetic detection device;

collecting output waveform information and phase information of a reflection-type magnetic sensor;

extracting characteristic parameter values of the coins to be identified;

and comparing the characteristic parameter value of the coin to be identified with the characteristic parameter value of the pre-stored standard coin, and judging the authenticity of the coin to be identified.

In the reflection-type magnetic detection device, the inductive sensor, the coin discrimination sorting system and the control method, the plurality of detection coils, the plurality of excitation coils and the plurality of compensation coils are engraved on the multilayer circuit board and are fixedly arranged in the limiting wall of the shell, so that the position change among the coils is avoided, the inductive sensor can be obliquely arranged, the coins roll through the sensor by utilizing the self weight, and a coin conveying belt is omitted. The reflection-type magnetic detection device adopts a plurality of coil groups, so that the reduction of the identification sensitivity is avoided, and the accuracy of coin identification is improved. The invention has simple structure, easy realization, low cost and convenient popularization.

Drawings

FIG. 1 is a schematic structural diagram of a reflective magnetic sensor according to an embodiment of the present invention.

Fig. 2 is an exploded view of the structure of a reflection type magnetic detection device according to an embodiment of the present invention.

FIG. 3 is a schematic structural diagram of an inductive sensor for coin discrimination according to an embodiment of the present invention.

FIG. 4 is a schematic structural diagram of a coin discriminating and sorting system according to an embodiment of the present invention.

FIG. 5 is a flow chart of a control method of the coin authentication and sorting system according to an embodiment of the present invention.

Detailed Description

The present embodiment is an example of a reflection type magnetic detection device, and the present invention will be described in detail below with reference to specific embodiments and the accompanying drawings.

Referring to fig. 1 and 2, a reflective magnetic detection apparatus 100 for coin type sorting and authenticity identification according to an embodiment of the present invention is shown, and includes a multilayer circuit board 70, and a plurality of detection coils, a plurality of excitation coils, and a plurality of compensation coils sequentially disposed on the multilayer circuit board 70, wherein the plurality of detection coils, the plurality of excitation coils, and the plurality of compensation coils are sequentially overlapped and engraved on each layer of circuit board from top to bottom.

Further, the plurality of detection coils include a first detection coil 10 and a second detection coil 20, the first detection coil 10 is a circular coil, and the second detection coil 20 is an elliptical coil. The plurality of excitation coils include a first excitation coil 30 and a second excitation coil 40, the first excitation coil 30 is a circular coil, and the second excitation coil 40 is an elliptical coil. The plurality of compensation coils include a first compensation coil 50 and a second compensation coil 60, the first compensation coil 50 is a circular coil, and the second compensation coil 60 is an elliptical coil.

Further, the multilayer wiring board 70 is a 6-layer wiring board, and the first detection coil 10, the second detection coil 20, the first excitation coil 30, the second excitation coil 40, the first compensation coil 50 and the second compensation coil 60 are sequentially engraved on the 1 st to 6 th layer wiring boards from top to bottom; the first detection coil 10, the first excitation coil 30 and the first compensation coil 50 form a first coil module 80, the second detection coil 20, the second excitation coil 40 and the second compensation coil 60 form a second coil module 90, and the first coil module 80 and the second coil module 90 respectively form a PCB coil assembly with excitation, detection and temperature drift compensation functions.

Specifically, each coil in the first coil module 80 is a circular coil, each coil in the second coil module 90 is an elliptical coil, and the first coil module 80 and the second coil module 90 are placed in an overlapping manner.

Specifically, the PCB engraving integration technology of the multilayer circuit board 70 integrates the functions of excitation, detection and compensation, solves the problem of magnetic field distribution change caused by displacement between coils, simultaneously ensures uniform distribution of magnetic field, improves the consistency of coils, reduces the influence of temperature drift on coils, and improves the sensitivity and stability of testing.

And the inductive sensor 200 for coin discrimination and sorting is arranged on a coin sorting machine and comprises a fixed plate 210 and a shell limiting wall 220 penetrating the fixed plate 210, wherein the reflection-type magnetic detection device is fixedly arranged in the shell limiting wall 220.

Further, a connection port 211 is formed at one side of the fixing plate 210, and a connector of each coil of the reflective magnetic sensing device is electrically connected to the connection port 211.

Specifically, the inductive sensor 200 further includes a housing (not shown), the housing limiting wall 220 is formed by extending the inner side wall of the housing, and since the reflective magnetic detection device is fixedly installed in the housing limiting wall 220 and the coils are engraved in the multilayer circuit board 70, the relative position of the coils is not changed no matter the inductive sensor is installed horizontally or obliquely, thereby ensuring the stability of the inductive sensor.

And, a false clear system 300 that divides of coin discernment, including drive arrangement, inductive sensor, detection authentication device, coin discernment processing module and the temperature detection sensor of electric connection in proper order:

the driving device comprises an oscillation module, a frequency selection module, a frequency mixing module and an amplification driving module which are sequentially arranged, and is used for generating a composite excitation signal for driving the inductive sensor;

the inductive sensor adopts a reflection-type magnetic detection device and is used for identifying the authenticity of the coin;

the detection and identification device comprises a filter, an amplifier, an A/D converter and a storage which are sequentially arranged, and is used for filtering and amplifying the waveform signal and the phase signal output by the inductive sensor and extracting the characteristic parameter values of the variation of the waveform signal and the phase signal;

the coin identification processing module is used for comparing the characteristic parameter value of the coin to be identified with the characteristic parameter value of the standard coin, judging the authenticity and face value of the coin to be identified and sending the authenticity and face value to different processing paths;

the temperature detection sensor is used for detecting an external temperature value and feeding back the temperature value to the coin identification processing module, so that the coin identification processing module extracts the waveform signal and the phase signal of the inductive sensor according to the temperature value for temperature compensation.

Specifically, the composite excitation electric signal generated by the driving device is input to an excitation coil of the reflection type magnetic detection device, the excitation coil generates an alternating magnetic field, and the alternating magnetic field generates a varying current in the detection coil and the compensation coil. When the coin to be identified passes through the upper part of the reflection type magnetic detection device, induction eddy current is generated in the coin to be identified, the change of an induction magnetic field caused by the induction eddy current changes, so that the magnitude and the phase of current in the exciting coil, the detecting coil and the compensating coil change, the detection identification device detects the magnitude and the phase change of the current, and characteristic parameter values of the coin to be identified are extracted.

Specifically, a transmission type inductive sensor can be arranged in the inductive sensor, so that the identification result of the coin is more accurate.

Further, the storage stores the characteristic parameter value of the standard coin as the standard value of the characteristic parameter value of the coin to be identified.

And a control method of the coin discrimination and sorting system, which comprises the following steps:

s10, pre-storing characteristic parameter values of standard coins with various denominations;

s20, inputting the composite excitation signal into the excitation coil group of the reflection type magnetic detection device;

s30, passing the coin to be identified over the reflection-type magnetic detection device;

s40, collecting output waveform information and phase information of the reflection-type magnetic detection device;

s50, extracting the characteristic parameter values of the coins to be identified;

and S60, comparing the characteristic parameter value of the coin to be identified with the characteristic parameter value of the pre-stored standard coin, and judging the authenticity of the coin to be identified.

Specifically, in S40, the method for acquiring output waveform information and phase information of the reflective magnetic detection device includes the following steps:

the detection and discrimination device collects the waveform information and phase information of the output electric signals of the detection coil, the excitation coil and the compensation coil of the reflection-type magnetic detection device in real time, and extracts the characteristic parameter values after filtering, amplification and analog-to-digital conversion.

Specifically, the driving device is configured to generate a composite excitation signal for driving the inductive sensor, the storage is configured to store characteristic parameter values of a standard coin, and the characteristic parameter values of the standard coin include output waveform information and phase information of the first detection coil 10, the second detection coil 20, the first excitation coil 30, the second excitation coil 40, the first compensation coil 50, and the second compensation coil 60 when the standard coin passes through the inductive sensor.

Specifically, when no coin passes through the inductive sensor, since the positions of the respective coils in the reflection-type magnetic detection device are fixed, the output waveform signals of the first detection coil 10, the second detection coil 20, the first compensation coil 50, and the second compensation coil 60 caused by the alternating magnetic field generated by the first excitation coil 30 and the second excitation coil 40 remain unchanged.

When the coin passes through the inductive sensor, the direction of the coin is perpendicular to the direction of the magnetic lines of the alternating magnetic field, the magnetic lines of the alternating magnetic field are cut, and eddy currents are generated in the coin, so that the distribution and the strength of the magnetic field in the inductive sensor are influenced, and output waveform signals of the first detection coil 10, the second detection coil 20, the first excitation coil 30, the second excitation coil 40, the first compensation coil 50 and the second compensation coil 60 are changed.

The detection and discrimination device collects the output waveform information and phase information of the first detection coil 10, the second detection coil 20, the first exciting coil 30, the second exciting coil 40, the first compensating coil 50 and the second compensating coil 60 in real time and compares the output waveform information and the phase information with the characteristic parameter values of the standard coin stored in the storage to judge the authenticity of the coin to be discriminated.

In the reflective magnetic detection device, the inductive sensor, the coin discrimination and sorting system and the control method, the plurality of detection coils, the plurality of excitation coils and the plurality of compensation coils are engraved on the multilayer circuit board 70 and are fixedly arranged in the shell limiting wall 220, so that the position change among the coils is avoided, the inductive sensor can be obliquely arranged, the coin rolls over the sensor by using the weight of the coin, and a coin conveying belt is omitted. The reflection-type magnetic detection device adopts a plurality of coil groups, so that the reduction of the identification sensitivity is avoided, and the accuracy of coin identification is improved. The invention has simple structure, easy realization, low cost and convenient popularization.

It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and those skilled in the art can make various modifications and changes. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a reflection-type magnetism detection device for coin kind is clear to be divided and true and false discernment, its characterized in that includes the multilayer circuit board and locates in proper order a plurality of detection coils, a plurality of excitation coil and a plurality of compensating coil on the multilayer circuit board are a plurality of detection coil, a plurality of excitation coil and a plurality of compensating coil overlap from last to carving on every layer of circuit board down in proper order.

2. The reflection type magnetic detecting apparatus according to claim 1, wherein said plurality of detection coils includes a first detection coil and a second detection coil, said first detection coil being a circular coil, said second detection coil being an elliptical coil.

3. The reflection type magnetic detection apparatus according to claim 1, wherein said plurality of excitation coils include a first excitation coil and a second excitation coil, said first excitation coil being a circular coil, said second excitation coil being an elliptical coil.

4. The reflective magnetic sensing device of claim 1, wherein said plurality of compensation coils includes a first compensation coil and a second compensation coil, said first compensation coil being a circular coil, said second compensation coil being an elliptical coil.

5. The reflection type magnetic detection device according to claim 2, 3 or 4, wherein said multilayer wiring board is a 6-layer wiring board, and said first detection coil, said second detection coil, said first excitation coil, said second excitation coil, said first compensation coil and said second compensation coil are engraved in this order from the top on the 1 st to 6 th layer wiring boards; the first coil module is formed by the first exciting coil and the first compensating coil, the second coil module is formed by the second exciting coil and the second compensating coil, and the first coil module and the second coil module respectively form a PCB coil group with exciting, detecting and temperature drift compensating functions.

6. The inductive sensor for the false distinguishing and sorting of the coins is arranged on a coin sorting machine and is characterized by comprising a fixed plate and a shell limiting wall penetrating through the fixed plate, wherein a reflection-type magnetic detection device is fixedly arranged in the shell limiting wall.

7. The inductive sensor according to claim 6, wherein the fixed plate has a connection port at one side thereof, and the terminals of the respective coils of the reflective magnetic sensing device are electrically connected to the connection port.

8. The utility model provides a false clear system of dividing of coin discernment which characterized in that, includes drive arrangement, inductive sensor, detection authentication device, coin discernment processing module and the temperature detection sensor of electric connection in proper order:

the driving device comprises an oscillation module, a frequency selection module, a frequency mixing module and an amplification driving module which are sequentially arranged, and is used for generating a composite excitation signal for driving the inductive sensor;

the inductive sensor adopts a reflection-type magnetic detection device and is used for identifying the authenticity of the coin;

the detection and identification device comprises a filter, an amplifier, an A/D converter and a storage which are sequentially arranged, and is used for filtering and amplifying the waveform signal and the phase signal output by the inductive sensor and extracting the characteristic parameter values of the variation of the waveform signal and the phase signal;

the coin identification processing module is used for comparing the characteristic parameter value of the coin to be identified with the characteristic parameter value of the standard coin, judging the authenticity and face value of the coin to be identified and sending the authenticity and face value to different processing paths;

the temperature detection sensor is used for detecting an external temperature value and feeding back the temperature value to the coin identification processing module, so that the coin identification processing module extracts the waveform signal and the phase signal of the inductive sensor according to the temperature value for temperature compensation.

9. The coin authentication and counting system according to claim 8, wherein the storage stores a value of the characteristic parameter of the standard coin as a standard value of the characteristic parameter of the coin to be authenticated.

10. A control method of a coin counterfeit detection and sorting system is characterized by comprising the following steps:

pre-storing characteristic parameter values of standard coins with various face values;

inputting the composite excitation signal into an excitation coil group of the reflection-type magnetic detection device;

passing coins to be identified over a reflective magnetic detection device;

collecting output waveform information and phase information of a reflection-type magnetic sensor;

extracting characteristic parameter values of the coins to be identified;

and comparing the characteristic parameter value of the coin to be identified with the characteristic parameter value of the pre-stored standard coin, and judging the authenticity of the coin to be identified.

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