Metal detection device

Abstract

This application discloses a metal detection device, which includes a housing, a first detection component, and a second detection component. The housing includes a first accommodating space formed by multiple side walls, and a second accommodating space is disposed within the first accommodating space. An installation space is formed between the first and second accommodating spaces. The installation space includes at least a first installation space and a second installation space located at two opposite ends of the housing. By setting the first detection component and the second detection component in the first and second installation spaces respectively, and using the first and second detection components to perform metal detection on the object placed in the second accommodating space, it is possible to quickly determine whether the object contains metal objects. This achieves rapid screening of the object, effectively reducing the number of manual bag opening checks, simplifying inspection steps, reducing time consumption, and thus improving inspection efficiency and personnel passage efficiency.

Description

Technical Field

[0001] This application relates to the field of metal detection equipment technology, and more particularly to a metal detection device. Background Technology

[0002] In the field of public safety, security checks are a crucial link in ensuring the safety of various locations. Currently, the mainstream security check process generally adopts a "person-bag separation" detection model. Specifically, this detection model requires that the person being checked be separated from their personal bags, luggage, and other items, and that both the person and the items be checked separately. Security gates can be used to scan people to detect whether they are carrying prohibited metal items. For example, in scenarios such as subway stations, airports, and train stations, firearms and knives need to be detected; in scenarios such as examination rooms and specific office spaces, additional detection of wireless communication devices is required. As for items, manual bag opening and inspection are usually required for confirmation. However, manual bag opening and inspection is cumbersome and time-consuming, resulting in low efficiency and affecting the passage of people. Utility Model Content

[0003] This application discloses a metal detection device to solve the problem of low inspection efficiency in the manual package opening inspection method in related technologies.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows: This application discloses a metal detection device, which includes a housing and a metal detection component. The housing includes multiple side walls that enclose a first accommodating space. A second accommodating space is provided within the first accommodating space, and an installation space is formed between the first accommodating space and the second accommodating space. The metal detection component includes at least a first detection component and a second detection component. The installation space includes at least a first installation space and a second installation space located at two opposite ends of the housing. The first detection component is located in the first installation space, and the second detection component is located in the second installation space. The first detection component and the second detection component are used to perform metal detection on the detection object placed in the second housing space.

[0005] The technical solution adopted in this application can achieve the following technical effects: The metal detection device disclosed in this application improves upon related technologies. The disclosed metal detection device includes a housing and metal detection components. The housing includes multiple side walls that enclose a first accommodating space. A second accommodating space is provided within the first accommodating space, and an installation space is formed between the first and second accommodating spaces. The metal detection components include at least a first detection component and a second detection component. The installation space includes at least a first installation space and a second installation space located at two opposite ends of the housing. By respectively setting the first and second detection components in the first and second installation spaces, and using the first and second detection components to detect metal objects placed in the second accommodating space, it is possible to quickly determine whether the detected object contains metal objects. This achieves rapid screening of the detected object, effectively reducing the number of manual bag opening checks, simplifying inspection steps, reducing time consumption, and thus improving inspection efficiency and personnel passage efficiency. Attached Figure Description

[0006] Figure 1 This is one of the structural schematic diagrams of the metal detection device disclosed in the embodiments of this application; Figure 2 This is an exploded view of the metal detection device disclosed in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of the first detection component disclosed in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the second detection component disclosed in an embodiment of this application; Figure 5 This is a second schematic diagram of the structure of the metal detection device disclosed in the embodiments of this application; Figure 6 This is an exploded view of the third detection component disclosed in the embodiments of this application.

[0007] Explanation of reference numerals in the attached figures: 110-Box body, 111-Side wall, 112-First accommodating space, 113-Second accommodating space, 114-First mounting space, 115-Second mounting space, 116-Opening, 117-Base plate, 120-First detection component, 121-Mounting plate, 122-Electromagnetic coil, 1221-Transmitting coil, 1222-Receiving coil, 1222a-Sub-coil, 123-Acquisition circuit board, 124-Support component, 130-Second detection component, 140-Third detection component, 150-Fourth detection component, 160-Infrared detection module, 161-Transmitter, 162-Receiver, 170-Main control circuit board, 180-Power module, 190-Decorative panel, 200-Indicator light, 210-Switch module. Detailed Implementation

[0008] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0009] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more.

[0010] The technical solutions disclosed in the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0011] Please refer to Figures 1 to 6 This application discloses a metal detection device that can be used to quickly screen whether a target contains metal objects. For packages containing metal objects detected, security personnel can further confirm whether they are prohibited metal items, thus effectively reducing the workload of security personnel. In this embodiment, the metal detection device can also directly detect whether a target contains prohibited metal items. For example, in scenarios such as subway stations, airports, and train stations, prohibited metal items can include metal objects such as firearms and knives. In scenarios such as office buildings, factories, and examination rooms, prohibited metal items can further include wireless communication devices such as mobile phones and walkie-talkies. It is understood that the metal detection device of this application, whether used to detect whether a target contains metal objects or to detect whether a target contains prohibited metal items, can effectively reduce the workload of security personnel and improve security efficiency.

[0012] It should be noted that in usage scenarios such as subway stations, airports, and train stations, metal detectors can distinguish between everyday metal items like mobile phones, keychains, and belt buckles, and prohibited metal items like firearms and knives. They will only issue alarms for prohibited metal items, while not issuing alarms for everyday metal items, thus avoiding frequent false alarms. In usage scenarios where wireless communication devices are prohibited, the metal detector can further filter out wireless communication devices and issue alarms, while not issuing alarms for everyday metal items like keychains and belt buckles. Different types of metal objects produce different signal characteristic values ​​that are fed back to the metal detector. Therefore, the specific type of metal object can be identified based on the correspondence between different types of metal objects and their signal characteristic values, allowing for targeted alarms for specific types of metal objects in different usage scenarios. The aforementioned signal characteristic values ​​may include parameters such as phase and amplitude. The correspondence between signal characteristic values ​​and metal object types can be obtained through experimentation or by training a big data model, which will not be elaborated upon in this embodiment.

[0013] The aforementioned metal detection device may include a housing 110 and a metal detection assembly. The housing 110 serves as the structural foundation of the metal detection device and may include multiple side walls 111 connected sequentially to enclose a first accommodating space 112. A second accommodating space 113 is provided within the first accommodating space 112, and an installation space is formed between the first accommodating space 112 and the second accommodating space 113. It should be noted that multiple partitions may be provided inside the housing 110 to separate the second accommodating space 113 within the first accommodating space 112, and an installation space may be formed between the partitions and the side walls 111 of the housing 110. Alternatively, the housing 110 may also employ a combination design of an inner shell and an outer shell, with the outer shell forming the first accommodating space 112 and the inner shell disposed within the outer shell, forming the second accommodating space 113 within the first accommodating space 112. The area between the inner shell and the outer shell constitutes the installation space. The object to be tested (such as a handbag, backpack, etc.) can be placed into the second accommodating space 113 through the side of the box 110 or through the top of the box 110. For example, a detachable door panel design can be provided on the side or top of the box 110 to allow the object to be tested to enter and exit the second accommodating space 113.

[0014] The aforementioned metal detection assembly includes at least a first detection assembly 120 and a second detection assembly 130. The installation space includes at least a first installation space 114 and a second installation space 115 located at two opposite ends of the housing 110. The first detection assembly 120 may be located in the first installation space 114, and the second detection assembly 130 may be located in the second installation space 115. The first detection assembly 120 and the second detection assembly 130 are used to detect metal objects placed in the second receiving space 113 and identify whether the metal objects are prohibited metal objects.

[0015] It should be noted that during the actual detection process, the first detection component 120 and the second detection component 130 can determine whether the detected object contains metal objects. If no metal objects are detected, the metal detection device can continue to perform the next detection task. If metal objects are detected, whether the detected metal objects are prohibited metal items such as firearms, knives, or wireless communication devices can be determined by the metal detection device through signal characteristic values, or can be further confirmed by security personnel, thereby effectively reducing workload and improving inspection efficiency.

[0016] The first detection component 120 and the second detection component 130 can be very low frequency (VLF) detectors. VLF detectors include a transmitting coil 1221 and a receiving coil 1222. The transmitting coil 1221 is supplied with a low-frequency alternating current (typically 3kHz to 30kHz) to generate a continuously changing magnetic field (primary magnetic field). When this primary magnetic field encounters a metal object, it induces eddy currents within the metal object according to the principle of electromagnetic induction. These eddy currents then generate a new magnetic field (secondary magnetic field) opposite in direction to the primary magnetic field. The receiving coil 1222 can capture this secondary magnetic field. Alternatively, the first detection component 120 and the second detection component 130 can also be pulse detectors. Pulse detectors use a single coil or a group of coils to intermittently send pulsed magnetic fields to the metal object. After the pulsed magnetic field transmission ends, the magnetic field disappears, and the coil switches to receiving mode. If the aforementioned pulsed magnetic field has excited the metal object, the eddy current magnetic field generated by the metal object will slowly decay, and the decaying signal can be captured by the coil.

[0017] To facilitate the installation of the aforementioned detection components, the housing 110 may also include a base plate 117, and the connection between the base plate 117 and the multiple side walls 111 may be by bolt connection, riveting, etc.

[0018] As described above, the metal detection device disclosed in this application improves upon related technologies. When metal detection is required on an object, the object is placed in the second accommodating space 113, and the first detection component 120 and the second detection component 130 are used to detect the metal in the object. This allows for a quick determination of whether the object contains metal objects, enabling rapid screening of the object. This effectively reduces the number of manual bag checks, simplifies inspection steps, reduces time consumption, and improves inspection efficiency and personnel passage efficiency.

[0019] In one optional embodiment of this application, such as Figure 5 As shown, the aforementioned installation space may also include a third installation space located at one of the other two opposing ends of the housing 110. Correspondingly, the metal detection assembly may also include a third detection assembly 140 located in the third installation space. Similarly, the third detection assembly 140 may be a very low frequency detector or a pulse detector. The third detection assembly 140 can also be used to detect metal objects placed in the second receiving space 113. The arrangement of the first detection assembly 120, the second detection assembly 130, and the third detection assembly 140 as described above enables sufficient detection of the object, thereby improving detection accuracy.

[0020] In one optional embodiment of this application, such as Figure 5 As shown, the housing 110 may further include a third mounting space and a fourth mounting space located at two other opposing ends of the housing 110. Correspondingly, the metal detection assembly also includes a third detection component 140 and a fourth detection component 150. Similarly, the third detection component 140 and the fourth detection component 150 can be very low frequency detectors or pulse detectors. The third detection component 140 is located in the third mounting space, and the fourth detection component 150 is located in the fourth mounting space. The third detection component 140 and the fourth detection component 150 can also be used to perform metal detection on the object placed in the second receiving space 113. The first detection component 120, the second detection component 130, the third detection component 140, and the fourth detection component 150, arranged in the above manner, can fully detect the object in a surrounding manner, effectively reducing the false negative rate and improving the detection accuracy.

[0021] Regarding the specific deployment of the electromagnetic coils in each of the above-mentioned detection components, a reasonable selection can be made according to the detection requirements, and this application embodiment does not impose specific limitations on this. For example, in any two detection components located at two opposite ends of the housing 110: one may include a transmitting coil 1221 and the other may include a receiving coil 1222, or each detection component may include both a transmitting coil 1221 and a receiving coil 1222; furthermore, taking the first detection component 120 and the second detection component 130 as two detection components located at opposite ends of the housing 110 as an example, the third detection component 140 or the fourth detection component 150 may share the transmitting coil 1221 with at least one of the first detection component 120 and the second detection component 130, that is, the third detection component 140 or the fourth detection component 150 may only be provided with the receiving coil 1222.

[0022] In an optional embodiment, where the metal detection assembly further includes a third detection assembly 140, the first detection assembly 120 and the second detection assembly 130 may each include a transmitting coil 1221 and a receiving coil 1222. In actual operation, an alternating current can be supplied to the transmitting coil 1221, which generates a primary magnetic field. When the target object contains a metal object, the metal object generates a secondary magnetic field. The receiving coil 1222, corresponding to the transmitting coil 1221, can capture this secondary magnetic field. The presence of a metal object can be determined based on the signal of the secondary magnetic field captured by the receiving coil 1222. Then, the signal characteristic value of the secondary magnetic field can be used to further determine whether it is a prohibited metal object. When the target object does not contain a metal object, the receiving coil 1222 fails to detect the presence of the secondary magnetic field, and accordingly, it can be determined that the target object does not contain a metal object.

[0023] The third detection component 140 may include a receiving coil 1222. The receiving coil 1222 in the third detection component 140 can be used to cooperate with the transmitting coil 1221 of at least one of the first detection component 120 and the second detection component 130 to achieve metal detection.

[0024] For example, in an optional embodiment, where the metal detection assembly further includes a third detection assembly 140 and a fourth detection assembly 150, the first detection assembly 120 and the second detection assembly 130 each include a transmitting coil 1221 and a receiving coil 1222, and the third detection assembly 140 and the fourth detection assembly 150 each include a receiving coil 1222. In this case, the receiving coil 1222 in the third detection assembly 140 and the fourth detection assembly 150 can be used to cooperate with the transmitting coil 1221 of at least one of the first detection assembly 120 and the second detection assembly 130 to achieve metal detection.

[0025] Exemplarily, in an optional embodiment, when the metal detection assembly further includes a third detection assembly 140 and a fourth detection assembly 150, the first detection assembly 120 and the second detection assembly 130 each include a transmitting coil 1221 and a receiving coil 1222 operating at a first frequency, and the third detection assembly 140 and the fourth detection assembly 150 each include a transmitting coil 1221 and a receiving coil 1222 operating at a second frequency, wherein the first frequency and the second frequency are different. The first frequency can be 3kHz, 5kHz, etc., and the second frequency can be 8kHz, 10kHz, etc. It is understood that the detection principle of the third detection assembly 140 and the fourth detection assembly 150 is the same as that of the first detection assembly 120 and the second detection assembly 130. By transmitting and receiving based on different frequencies, the effect of frequency division detection can be achieved, further improving the detection accuracy.

[0026] In one optional embodiment of this application, the first detection component 120 and the second detection component 130 may have the same structure, both including a mounting plate 121 and an electromagnetic coil 122. The mounting plate 121 serves as the mounting base for the electromagnetic coil 122, and can be fitted to the side wall 111 of the housing 110. The electromagnetic coil 122 can be disposed on the surface of the mounting plate 121. The mounting plate 121 of the first detection component 120 is located in the first mounting space 114, and the mounting plate 121 of the second detection component 130 is located in the second mounting space 115. Furthermore, to facilitate the arrangement of the electromagnetic coil 122, multiple support members 124 can be provided on the mounting plate 121. The multiple support members 124 are spaced apart to form a mounting frame for the electromagnetic coil 122, and the electromagnetic coil 122 can be wound around the multiple support members 124 for installation. For example, the electromagnetic coil 122 of the first detection component 120 can be a transmitting coil 1221, and the electromagnetic coil 122 of the second detection component 130 can be a receiving coil 1222; or, the electromagnetic coil 122 of the first detection component 120 and the electromagnetic coil 122 of the second detection component 130 each include a transmitting coil 1221 and a receiving coil 1222.

[0027] The following is an exemplary description of the cooperative working principle of the first detection component 120 and the second detection component 130, but it should not be construed as a specific limitation on the embodiments of this application. Example 1: When the electromagnetic coil 122 of the first detection component 120 is a transmitting coil 1221 and the electromagnetic coil 122 of the second detection component 130 is a receiving coil 1222, the receiving coil 1222 in the second detection component 130 cooperates with the transmitting coil 1221 in the first detection component 120 to achieve metal detection. In actual operation, an alternating current can be supplied to the transmitting coil 1221 in the first detection component 120. The transmitting coil 1221 can generate a primary magnetic field. When the object being detected contains a metal object, the metal object will generate a secondary magnetic field. The receiving coil 1222 in the second detection component 130 can capture this secondary magnetic field. The presence of a metal object can be determined based on the signal of the secondary magnetic field captured by the receiving coil 1222. Then, based on the signal characteristic value of the secondary magnetic field, it can be further determined whether it is a prohibited metal object. When the object being detected does not contain a metal object, the receiving coil 1222 fails to detect the presence of the secondary magnetic field. Accordingly, it can be determined that the object being detected does not contain a metal object.

[0028] In a second example, when the electromagnetic coil 122 of the first detection component 120 and the electromagnetic coil 122 of the second detection component 130 each include a transmitting coil 1221 and a receiving coil 1222, the transmitting coil 1221 and the receiving coil 1222 in the first detection component 120 cooperate to achieve metal detection, and the transmitting coil 1221 and the receiving coil 1222 in the second detection component 130 cooperate to achieve metal detection. That is, the first detection component 120 and the second detection component 130 can independently detect the target object.

[0029] like Figures 2 to 4 As shown, the first detection component 120 and the second detection component 130 may also each include a data acquisition circuit board 123. The data acquisition circuit board 123 is electrically connected to the electromagnetic coil 122 and is used to control the current in the electromagnetic coil 122. It can also be used for data acquisition and signal conversion. The data acquisition circuit board 123 and the electromagnetic coil 122 are respectively arranged at different positions in the same installation space, such as... Figures 2 to 4 As shown, the acquisition circuit board 123 can be set on the side of the mounting plate 121. When the acquisition circuit board 123 is faulty, the acquisition circuit board 123 can be easily maintained by removing the outer side plate on the side wall.

[0030] It should be added that the structures of the third detection component 140 and the fourth detection component 150 can be the same as those of the first detection component 120 and the second detection component 130.

[0031] like Figures 2 to 4As shown, to further improve the detection accuracy of the secondary magnetic field by the receiving coil 1222, the receiving coil 1222 may include at least two sub-coils 1222a. The sub-coils 1222a can be electrically connected to the acquisition circuit board 123, and the at least two sub-coils 1222a can be arranged alternately on the surface of the mounting plate 121, thereby fully covering the second accommodating space 113 in the longitudinal direction of the housing 110. The specific number of sub-coils 1222a can be two, three, or more. For example, in this embodiment, considering the limited installation space of the housing 110, the number of sub-coils 1222a is two, and the two sub-coils 1222a are arranged alternately on the surface of the mounting plate 121.

[0032] In actual detection, whether the object to be detected is placed in the second accommodating space 113 can be used as the activation condition for the first detection component 120 and the second detection component 130 (in some embodiments, it can also be used as the activation condition for the third detection component 140 and / or the fourth detection component 150). Specifically, the metal detection device may further include an infrared detection module 160, which can be used to detect whether the object to be detected is placed in the second accommodating space 113. The infrared detection module 160 may specifically include a transmitter 161 and a receiver 162, the transmitter 161 may be located in the first mounting space 114, and the receiver 162 may be located in the second mounting space 115.

[0033] Optionally, the transmitting end 161 of the infrared detection module 160 can be disposed on the mounting plate 121 of the first detection component 120, and correspondingly, a light-transmitting hole opposite to the transmitting end 161 can be opened on the housing 110; the receiving end 162 of the infrared detection module 160 can be disposed on the mounting plate 121 of the second detection component 130, and correspondingly, a light-transmitting hole opposite to the receiving end 162 can be opened on the housing 110. When no detection object is placed in the second accommodating space 113, the optical path between the transmitting end 161 and the receiving end 162 is in a conducting state; when a detection object is placed in the second accommodating space 113, the optical path between the transmitting end 161 and the receiving end 162 is in a blocked state. The state change between the transmitting end 161 and the receiving end 162 can be used to determine whether the detection object is placed in the second accommodating space 113, and the activation timing of the first detection component 120 and the second detection component 130 can be controlled according to the state change.

[0034] The number of infrared detection modules 160 can be one, two, or more, depending on the size of the enclosure 110 and the requirements of the security inspection scenario. For example, when the enclosure 110 is large, to avoid missed detections, two or more infrared detection modules 160 can be set up for encrypted detection.

[0035] In this embodiment, to facilitate the entry and exit of the detection object into the second accommodating space 113, an opening 116 communicating with the second accommodating space 113 can be provided on the top of the housing 110, and the detection object can enter and exit the second accommodating space 113 through the opening 116.

[0036] In an optional embodiment of this application, the metal detection device may further include a main control circuit board 170 and a power module 180. The main control circuit board 170 may be electrically connected to the first detection component 120 and the second detection component 130, respectively. If the metal detection device includes a third detection component 140 and / or a fourth detection component 150, the main control circuit board 170 may also be electrically connected to the third detection component 140 and / or the fourth detection component 150. The power module 180 is electrically connected to the main control circuit board 170 to supply power to the main control circuit board 170.

[0037] In an optional embodiment of this application, the metal detection device may further include a decorative panel 190, an indicator light 200, and a switch module 210. The top of the first mounting space 114 and the top of the second mounting space 115 of the housing 110 may be open. To improve aesthetics, a decorative panel 190 may be provided on at least one of the tops of the first mounting space 114 and the second mounting space 115, covering either the first mounting space 114 or the second mounting space 115. The indicator light 200 may be disposed on the decorative panel 190 and may be electrically connected to the main control circuit board 170. The main control circuit board 170 may control the indicator light 200 to illuminate or deactivate based on the detection results. For example, if a prohibited metal object is detected, the main control circuit board 170 may control the indicator light 200 to illuminate; if no prohibited metal object is detected, the main control circuit board 170 may control the indicator light 200 to deactivate. Alternatively, the main control circuit board 170 may also use the color change of the indicator light 200 to indicate whether the detected object contains a prohibited metal object.

[0038] In addition, the switch module 210 can be installed outside the housing 110 for easy user operation. The switch module 210 is electrically connected to the power module 180, and the user can control the power module 180 to turn on or off by pressing the switch module 210, which improves the flexibility of the metal detection device.

[0039] The above embodiments of this application focus on describing the differences between the various embodiments. As long as the different technical features between the various embodiments are not contradictory, they can be combined to form more specific embodiments. For the sake of brevity, they will not be described in detail here.

[0040] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A metal detection device, characterized in that, The device includes a housing (110) and a metal detection assembly. The housing (110) includes multiple side walls (111), which enclose a first accommodating space (112). A second accommodating space (113) is provided within the first accommodating space (112), and an installation space is formed between the first accommodating space (112) and the second accommodating space (113). The metal detection assembly includes at least a first detection assembly (120) and a second detection assembly (130), and the installation space includes at least a first installation space (114) and a second installation space (115) located at two opposite ends of the housing (110), the first detection assembly (120) being located in the first installation space (114) and the second detection assembly (130) being located in the second installation space (115); the first detection assembly (120) and the second detection assembly (130) are used to perform metal detection on the detection object placed in the second receiving space (113).

2. The metal detection apparatus of claim 1, wherein The mounting space also includes a third mounting space located at one of the other two opposing ends of the housing (110), and the metal detection assembly also includes a third detection assembly (140) located in the third mounting space; or The enclosure (110) also includes a third installation space and a fourth installation space located at two other opposite ends of the enclosure (110), and the metal detection assembly also includes a third detection assembly (140) and a fourth detection assembly (150), the third detection assembly (140) being located in the third installation space and the fourth detection assembly (150) being located in the fourth installation space.

3. The metal detection device according to claim 2, characterized in that, When the metal detection assembly further includes the third detection assembly (140), each of the first detection assembly (120) and the second detection assembly (130) includes a transmitting coil (1221) and a receiving coil (1222), and the third detection assembly (140) includes a receiving coil (1222). The receiving coil (1222) in the third detection assembly (140) is used to cooperate with the transmitting coil (1221) of at least one of the first detection assembly (120) and the second detection assembly (130) to achieve metal detection; or When the metal detection assembly further includes the third detection assembly (140) and the fourth detection assembly (150), each of the first detection assembly (120) and the second detection assembly (130) includes a transmitting coil (1221) and a receiving coil (1222), and each of the third detection assembly (140) and the fourth detection assembly (150) includes a receiving coil (1222). The receiving coil (1222) in the third detection assembly (140) and the fourth detection assembly (150) is used to cooperate with the transmitting coil (1221) of at least one of the first detection assembly (120) and the second detection assembly (130) to achieve metal detection; or When the metal detection assembly further includes the third detection assembly (140) and the fourth detection assembly (150), the first detection assembly (120) and the second detection assembly (130) each include a transmitting coil (1221) and a receiving coil (1222) operating at a first frequency, and the third detection assembly (140) and the fourth detection assembly (150) each include a transmitting coil (1221) and a receiving coil (1222) operating at a second frequency, wherein the first frequency and the second frequency are different.

4. The metal detection device according to claim 1, characterized in that, Both the first detection component (120) and the second detection component (130) include a mounting plate (121) and an electromagnetic coil (122). The electromagnetic coil (122) is disposed on the surface of the mounting plate (121). The mounting plate (121) of the first detection component (120) is located in the first installation space (114), and the mounting plate (121) of the second detection component (130) is located in the second installation space (115). Wherein, the electromagnetic coil (122) of the first detection component (120) is a transmitting coil (1221), and the electromagnetic coil (122) of the second detection component (130) is a receiving coil (1222); or, the electromagnetic coil (122) of the first detection component (120) and the electromagnetic coil (122) of the second detection component (130) each include a transmitting coil (1221) and a receiving coil (1222).

5. The metal detection device according to claim 4, characterized in that, The first detection component (120) and the second detection component (130) also include a data acquisition circuit board (123), which is electrically connected to the electromagnetic coil (122).

6. The metal detection device according to claim 4, characterized in that, The receiving coil (1222) includes at least two sub-coils (1222a), which are arranged at intervals on the surface of the mounting plate (121).

7. The metal detection device according to claim 1, characterized in that, The metal detection device further includes an infrared detection module (160), which is used to detect whether the object to be detected is placed in the second accommodating space (113); The infrared detection module (160) includes a transmitter (161) and a receiver (162). The transmitter (161) is located in the first installation space (114), and the receiver (162) is located in the second installation space (115).

8. The metal detection device according to claim 1, characterized in that, The top of the box (110) is provided with an opening (116) communicating with the second accommodating space (113) for allowing the detection object to enter the second accommodating space (113).

9. The metal detection device according to claim 1, characterized in that, The metal detection device further includes a main control circuit board (170) and a power module (180). The main control circuit board (170) is electrically connected to the first detection component (120) and the second detection component (130) respectively, and the power module (180) is electrically connected to the main control circuit board (170).

10. The metal detection device according to claim 9, characterized in that, The metal detection device also includes a decorative panel (190), an indicator light (200), and a switch module (210). The decorative panel (190) is provided on the top of the first mounting space (114) and the top of the second mounting space (115). The indicator light (200) is located on the decorative panel (190) and is electrically connected to the main control circuit board (170). The switch module (210) is located outside the housing (110) and is electrically connected to the power module (180) to control the on / off state of the power module (180).

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