CN210572790U

CN210572790U - Security check equipment

Info

Publication number: CN210572790U
Application number: CN201820229982.5U
Authority: CN
Inventors: 李法利
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-02-09
Filing date: 2018-02-09
Publication date: 2020-05-19
Anticipated expiration: 2028-02-09

Abstract

The utility model provides a security installations, include: the first detector comprises an electromagnetic detection circuit, and the electromagnetic detection circuit collects a first signal generated when the metal conductor passes under the excitation of excitation voltage; the second detector comprises a gas detection circuit, and the gas detection circuit detects gas and/or liquid volatilized particles carried by a user and generates a second signal; the processing unit comprises a main control circuit, the main control circuit is respectively electrically connected with the electromagnetic detection circuit and the gas detection circuit, compares the first signal with a preset first signal threshold value, compares the second signal with a preset second signal threshold value, and generates an alarm signal according to the comparison result; and the alarm circuit is electrically connected with the main control circuit and comprises an alarm module, wherein the alarm module is arranged on the same side of the processing unit or the cross beam, receives an alarm signal of the main control circuit and gives an alarm according to the alarm signal. Thereby, simultaneous detection of metal and gas is achieved.

Description

Security check equipment

Technical Field

The utility model relates to a security installations field especially relates to a security installations.

Background

With the development of society, the safety problem is more and more concerned by people. Whether airports, stations, subways, entry and exit, courtrooms, prisons, drug rehabilitation centers, detention houses, hospitals, schools, large deduction venues, important international conferences, international convention and the like, are essential for security inspection of visitors. The security inspection is to inspect whether a traveler or an audience carries firearms, knives, ammunition, flammable and explosive dangerous goods and the like through some technical means and facilities, so as to intercept possible potential safety hazards and prevent violent crimes or accidents.

The existing security check equipment generally checks visitors one by one through a handheld detector and eliminates dangerous metal products carried by passengers.

In another mode, a gate or a security door is used for detecting and alarming metal objects carried by people. However, the existing gate or security check door cannot detect the liquid carried by the visitor, and needs a security checker to carry out hand check.

Above-mentioned two kinds of modes, can not detect the liquid that carries, can not combine visitor's image moreover, get rid of restricted visitor.

Disclosure of Invention

The utility model aims at providing a security installations to solve and can't carry out the security inspection simultaneously to metal and gas, and can't get rid of the problem of restricted visitor.

In order to solve the technical problem, the utility model provides a security inspection equipment, security inspection equipment includes:

the first detector is arranged on the first vertical plate and/or the second vertical plate and/or the cross beam, and comprises an electromagnetic detection circuit, wherein the electromagnetic detection circuit acquires a first signal generated when the metal conductor passes under the excitation of excitation voltage;

the second detector is arranged on the first vertical plate or the second vertical plate and comprises a gas detection circuit, and the gas detection circuit detects gas and/or liquid volatile particles carried by a user to generate a second signal;

the main control circuit is respectively electrically connected with the electromagnetic detection circuit and the gas detection circuit, compares the first signal with a preset first signal threshold value, compares the second signal with a preset second signal threshold value, and generates an alarm signal according to the comparison result;

and the alarm circuit is electrically connected with the main control circuit and comprises an alarm module which receives an alarm signal of the main control circuit and gives an alarm according to the alarm signal.

Preferably, the security inspection apparatus includes:

the image detection circuit is electrically connected with the main control circuit, acquires an image signal of a user, and sends the image signal to the main control circuit.

Preferably, the electromagnetic detection circuit includes: the device comprises a transmitting circuit, a transmitting coil, a receiving coil and a processing circuit;

the transmitting circuit generates excitation voltage and sends the excitation voltage to the transmitting coil;

the transmitting coil generates a magnetic field signal;

the receiving coil generates a change of the magnetic field signal when the metal conductor passes through, and generates an original first signal according to the change of the magnetic field signal;

the processing circuit is used for filtering, amplifying and carrying out analog-digital (AD) conversion processing on the original first signal to generate a first signal.

Preferably, the processing circuit comprises: the device comprises a first filter circuit, an amplifying circuit, an AD conversion circuit and a second filter circuit;

the first filter circuit is used for carrying out band-pass filtering on the original first signal to generate a first-stage filter signal;

the amplifying circuit is used for amplifying the primary filtering signal to generate an amplified signal;

an AD conversion circuit for sampling the amplified signal to generate a sampling signal, and performing AD conversion on the sampling signal to generate an AD conversion signal;

the second filter circuit filters the AD conversion signal to generate a first signal.

Preferably, the security inspection apparatus further includes: an airflow generating unit;

the airflow generating unit is used for generating airflow which is used for blowing particles volatilized by gas and/or liquid carried by a user to the second detector.

Through the utility model provides a safety inspection equipment realizes detecting metal and gas simultaneously, has got rid of limited visitor simultaneously.

Drawings

Fig. 1 is a schematic structural diagram of a security inspection apparatus provided in an embodiment of the present invention;

fig. 2 is a circuit structure diagram of a security inspection apparatus provided in an embodiment of the present invention;

fig. 3 is an embodiment of fig. 2 provided in accordance with an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a receiving coil according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of the installation position of the transmitting coil;

fig. 6 is a schematic diagram of the arrangement of the transmitting coils.

Detailed Description

The technical solution of the present invention is further described in detail by the accompanying drawings and examples.

Fig. 1 is the embodiment of the utility model provides a security installations's schematic structure diagram. Fig. 2 is a circuit structure diagram of the security inspection equipment provided by the embodiment of the utility model. With reference to fig. 1 and 2, the security inspection apparatus includes: the device comprises a main body structure 1, a first detector 2, a second detector 3, a processing unit 4 and an alarm module 5. Wherein the first detector 2 comprises an electromagnetic detection circuit 210 and the second detector 3 comprises a gas detection circuit 220. The output end of the first detector is connected to the first input end of the main control circuit, the output end of the second detector is connected to the second input end of the main control circuit, and the output end of the main control circuit is connected to the input end of the alarm circuit.

The main body structure 1 includes a first vertical plate 11, a second vertical plate 12 and a cross beam 13, and tops of the first vertical plate 11 and the second vertical plate 12 are connected through the cross beam 13.

The first detector 2 is disposed on the first vertical plate 11 and/or the second vertical plate 12 and/or the cross beam 13, and the electromagnetic detection circuit 210 collects a first signal generated when the metal conductor passes through under excitation of the excitation voltage.

The second detector 3 is disposed on the first vertical plate 11 or the second vertical plate 12, the second detector 3 includes a gas detection circuit 220, and the gas detection circuit 220 detects particles volatilized from gas and/or liquid carried by a user to generate a second signal.

Wherein, this safety inspection equipment can also include: the airflow generating unit 6, the airflow generating unit 6 and the second detector 3 are disposed on different vertical plates, that is, when the airflow generating unit 6 is disposed on the first vertical plate 11, the second detector 3 is disposed on the second vertical plate 12, and when the airflow generating unit 4 is disposed on the second vertical plate 12, the second detector 3 is disposed on the first vertical plate 11.

The airflow generating unit 6 may be an electric fan or other device capable of generating airflow. The gas particle detection device is arranged in the vertical plate, and is used for detecting the gas particles volatilized by the collected inflammable and explosive volatile liquid, the gas particles carried by a user and the like under the blowing of the air flow, so that the condition of being interfered by false alarm in the external complex environment is avoided, and the components of the inflammable and explosive gas particles can be accurately detected.

And the processing unit 4 is arranged on the same side of the second detector 3 or on the cross beam 13, the processing unit 4 comprises a main control circuit 230, the main control circuit 230 is respectively electrically connected with the electromagnetic detection circuit 210 and the gas detection circuit 220, compares the first signal with a preset first signal threshold value, compares the second signal with a preset second signal threshold value, and generates an alarm signal according to a comparison result.

And the alarm module 5 is arranged on the same side of the processing unit 4 or on the cross beam 13, the alarm module 5 comprises an alarm circuit 240, the alarm circuit 240 is electrically connected with the main control circuit 230, receives an alarm signal of the main control circuit, and gives an alarm according to the alarm signal.

In one example, the alarm module 5 may include a speaker that emits an alarm sound when an alarm signal is received by the speaker.

In another example, the alarm module 5 may also be an indicator light that flashes to alarm when receiving an alarm signal.

In yet another example, the alarm module 5 may also be a display screen, which can display an alarm item, such as a knife, a mobile phone, etc. The Display may be a Liquid Crystal Display (LCD).

In still another example, the alarm module can be any combination of the above three conditions to achieve diversification of alarm modes.

Fig. 3 is an embodiment of fig. 2 according to an embodiment of the present invention. As shown in fig. 3, the security inspection apparatus further includes:

the image detection circuit 250 is electrically connected to the main control circuit 230, and is configured to collect an image signal of a user and send the image signal to the main control circuit 230.

Wherein the electromagnetic detection circuit 210 comprises: a transmit circuit 310, a transmit coil 320, a receive coil 330, and a processing circuit 340.

The transmitting circuit 310 generates an excitation voltage and transmits the excitation voltage to the transmitting coil 320, so that the transmitting coil 320 generates a magnetic field signal. The frequency range of the excitation signal is 1KHZ-10KHZ, the voltage range is 1-5V, and the frequency is 5.3KHZ in the present application.

The transmitting coil 320 is disposed on the first vertical plate 11 and/or the second vertical plate 12, and generates a magnetic field signal. In order to improve the detection accuracy, transmitting coils 320 may be disposed on both first vertical plate 11 and second vertical plate 12.

The receiving coil 330 generates an original first signal according to a change of the magnetic field signal when the metal conductor passes through the receiving coil.

At least two receiving coils 330 are disposed in the transmitting coil 320, and are used for detecting a change of the magnetic field signal under excitation of the excitation voltage to generate an original first signal.

One transmitting coil 320 may include at least one set of receiving coils 330, and one set of two receiving coils 330, and the present application may include five sets of receiving coils, and two receiving coils 330 in one set are connected in series and in reverse, and ideally, since the electromotive forces generated by the two receiving coils 330 are the same in magnitude but opposite in phase, the output voltage may be regarded as approaching 0. When a metal conductor passes through, the magnetic field changes, causing the two receiving coils 330 to be unbalanced and thus a voltage output.

It will be appreciated that there may be multiple sets of receive coils 330. The number of the receiving coils 330 may be set according to detection requirements (i.e., application scenarios of the security check device), for example, when the security check device is applied to a large military conference, a mobile phone needs to be detected, so the positions of the receiving coils 330 may correspond to the commonly used carrying positions of the mobile phone, and at this time, the number of the receiving coils 330 is mainly controlled with the scenarios that need to be detected all over the body, and is relatively small.

When the safety inspection equipment is applied to the scenes such as subways, stations and the like needing to detect the whole body, the receiving coils 330 can be distributed according to the basic structure of the human body, the receiving coils 330 can divide the human body into mutually overlapped mesh detection areas, for example, a plurality of groups of receiving coils 330 can be distributed according to the heights of shoes, trousers pockets and jacket pockets.

Fig. 4 is a schematic structural diagram of a receiving coil according to an embodiment of the present invention, as shown in fig. 4, the receiving coil a and the receiving coil B are a set, and there are five sets, which are respectively used for detecting different positions. The transmitting coil 220 has an inductance of 1.8mH, a length of 180cm, a width of 39cm, and 20 turns, and the receiving coil 230 has an inductance of 30mH, a length of 31cm, a width of 10.5cm, and 250 turns. The structure is beneficial to realizing high-precision detection, and therefore, the safety inspection efficiency is also improved.

In one example, as shown in fig. 5-6, fig. 5 is a schematic view of the mounting location of the transmit coil. Fig. 6 is a schematic diagram of the arrangement of the transmitting coils. With reference to fig. 5-6, the transmitting coil 320 is designed according to the height of a human, in order to detect comprehensively, a certain number of receiving coils 330 are arranged inside the transmitting coil, the transmitting coil 320 is respectively arranged on the first vertical plate 11 and the second vertical plate 2, the distance between the bottom of the transmitting coil 320 and the bottom of the first vertical plate 11 and the distance between the bottom of the second vertical plate 22 are respectively 15mm, and the distance between the left and right sides of the transmitting coil 320 and the left and right sides of the first vertical plate 11 and the distance between the left and right sides of the second vertical plate 12 are both 10 mm.

The size of the first-zone receiving coil, the second-zone receiving coil and the third-zone receiving coil is the same, the number of turns is 300 turns, the left-right length is 132mm, the upper-lower length is 180mm, the size of the fourth-zone receiving coil and the size of the fifth-zone receiving coil are the same, the number of turns is 250 turns, the left-right length is 110mm, and the upper-lower length is 310 mm.

The first area receiving coil detects the positions of feet and shanks, the second area receiving coil detects the positions of knees and thighs, the third area receiving coil detects the position of waist, the fourth area receiving coil detects the position of chest, and the fifth area receiving coil detects the position of head. Thereby, a full body detection of the visitor is achieved.

The processing circuit 340 filters, amplifies, and performs analog-to-digital AD conversion on the original first signal to generate a first signal.

Wherein the processing circuit 340 comprises: the device comprises a first filter circuit, an amplifying circuit, an AD conversion circuit and a second filter circuit.

Since the electromagnetic detection circuit 210 detects the electromagnetic field by using the operation of the electromagnetic field, the interference term of the electromagnetic field is very complicated and comes from the environment or the electromagnetic field itself, and therefore, the filtering is necessary. And the first filtering circuit is used for carrying out band-pass filtering on the original first signal to generate a first-stage filtering signal. Since the carrier frequency of the original first signal is fixed, band-pass filtering is required, and the first filtering circuit may be a butterworth filter to suppress noise.

And the amplifying circuit is used for amplifying the primary filtering signal to generate an amplified signal. The amplifying circuit may be a multi-stage differential amplifying circuit, which may reduce noise while amplifying.

And an AD conversion circuit for sampling the amplified signal to generate a sampling signal and performing AD conversion on the sampling signal to generate an AD conversion signal. The conversion accuracy and conversion speed of the AD converter circuit determine the accuracy and speed that can be achieved by the electromagnetic detection circuit 110, and MAX197 may be selected as the AD converter circuit. The MAX chip has short conversion time (6us), 8-path input channels, a standard parallel interface and an 8-bit three-state data I/O port, can be directly interfaced with most single-chip microcomputers, and is convenient to use. Thereby, the original first signal is converted into an AD converted signal, and conversion from an analog signal to a digital signal is realized.

And a second filter circuit for filtering the AD conversion signal to generate a first signal. At this time, a Finite Impulse Response (FIR) filter may be sampled, and then, a plurality of times of sampling may be performed to perform arithmetic mean filtering, and according to the positive sine wave processing, an amplitude value and a phase angle may be extracted to generate the first signal.

The main control circuit 230 may perform a comprehensive judgment on the first signal, the second signal and the image information, and when at least one of the first signal, the second signal and the image information is not matched, an alarm signal may be generated, where the alarm signal is used to instruct the alarm circuit 240 to alarm. Therefore, the detection of the metal conductor, the gas and the image can be realized.

Further, the security inspection device may have a communication module thereon, and the communication module may be connected to the main control circuit and configured to send the alarm information to a terminal, where the terminal includes, but is not limited to, a mobile phone, a cloud server, and the like. Therefore, the service condition of the security check equipment can be checked in real time, and the security check equipment is convenient to manage.

The above embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A security inspection apparatus, characterized in that the security inspection apparatus comprises: the device comprises a first detector, a second detector, a main control circuit and an alarm circuit;

the output end of the first detector is connected to the first input end of the main control circuit, the output end of the second detector is connected to the second input end of the main control circuit, and the output end of the main control circuit is connected to the input end of the alarm circuit;

2. The security apparatus of claim 1, wherein the security apparatus comprises:

3. The security device of claim 1, wherein the electromagnetic detection circuit comprises: the device comprises a transmitting circuit, a transmitting coil, a receiving coil and a processing circuit;

the transmitting coil generates a magnetic field signal;

4. The security device of claim 3, wherein the processing circuit comprises: the device comprises a first filter circuit, an amplifying circuit, an AD conversion circuit and a second filter circuit;

5. The security apparatus of claim 1, further comprising: an airflow generating unit;