Security door three-layer board door plate structure and coil stabilizing and fixing method

Abstract

The invention discloses a security check door three-layer plate door plate structure and a coil stabilizing and fixing method, and relates to the technical field of security check equipment.The door plate structure is composed of an outer-layer door plate, an inner-layer door plate and a door plate for fixing a coil, the three-layer door plate is tightly bonded through glue, and the door plate is formed by pressing through a three-layer plate pressing technology; by introducing the three-layer plate technology and the fixed mold technology, the manufacturing precision of the door plate of the security door is improved, meanwhile, the production technological process is greatly simplified, specifically, the outer-layer door plate, the middle-layer door plate for fixing the coil and the inner-layer door plate can be independently manufactured, so that the door plate is more attractive and smooth, and the production cost is reduced. Each layer of door plate can be optimally designed according to specific functions of the door plate, the three layers of door plates are tightly bonded together through special glue, so that the door plates are thicker and more stable and form a whole, in the process, a complex screw fixing procedure is not needed any more, the assembly time and the labor cost are reduced, and subsequent machining steps are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of security inspection equipment, and specifically to a three-layer pressing plate door panel structure of a security door and a method for stably fixing coils. Background Art

[0002] With the development of society and the continuous improvement of safety awareness, security doors are increasingly widely used in various places, such as airports, railway stations, subway stations, schools, factories, and important event venues. As a security inspection device for detecting whether a person is carrying metal items, a security door works based on the principle of electromagnetic induction. When a metal item passes through the security door, the coils inside it will generate an induced current, which will then trigger the alarm system to achieve the detection of metal items. The core part of the security door lies in its door panel structure, and the coil layout and fixing method inside the door panel directly affect the performance and stability of the security door, playing a crucial role in ensuring the safety of the venue.

[0003] However, the traditional security door panel structure usually consists of only a simple outer layer and an inner layer, and its coil fixing method is relatively rough. There are many deficiencies in the three-layer pressing plate door panel structure and coil fixing:

[0004] First of all, in terms of the door panel structure, the door panels of traditional security doors often only focus on the basic support function. The door panels are relatively thin, and their stability is poor under the influence of wind, vibration, etc., which will change the original magnetic field distribution, thereby affecting the alarm accuracy. Moreover, the adaptability to different usage environments is poor. For some harsh environments, such as high temperature, high humidity, strong corrosion, and high dust, ordinary door panels are prone to deformation, corrosion, and damage, thus affecting the service life and reliability of the security door. In addition, the appearance design of the door panel is also relatively single, unable to meet the personalized needs of the security door appearance in some special scenarios, restricting the wide application of the security door in different scenarios;

[0005] Secondly, for the fixation of coils, generally, the screw fixation method is adopted. In the actual use process, due to the long-term high-frequency use of the security door, it will be affected by the frequent collisions of people entering and leaving and environmental vibrations, and the screws are prone to loosen, resulting in the displacement of the coil position. Once the coil position is displaced, the magnetic field distribution of the security door will be disordered, causing a significant decrease in the accuracy of metal detection, and even false alarms or missed alarms may occur, seriously affecting the security inspection effect;

[0006] Finally, in the installation process of the traditional fixation method, workers need to tighten the screws one by one, which is complex in operation and highly dependent on manual labor. This not only leads to low production efficiency, but also due to the operation differences of different workers, it is difficult to ensure that the coil fixation effects of each security door are the same, and quality problems are prone to occur.

[0007] In summary, the door panel structure and coil fixing method of traditional security gates can no longer meet the requirements of modern security gates in terms of production efficiency and diverse application scenarios. The existing problems such as simple door panel structure, poor stability of door panels, unstable coil fixing, low production efficiency, and lack of optimization for the coil working environment have become important factors restricting the further development of security gates, and there is an urgent need for a new technical solution to solve these problems. Summary of the Invention

[0008] The purpose of the present invention is to make up for the deficiencies of the prior art and provide a three-layer pressing plate door panel structure and a coil stable fixing method for security gates. It can pre-dig a groove at a predetermined coil placement position through a fixed mold process and fix the coil in the groove by means of clamping, thus solving the problem of coil loosening. In addition, through the three-layer pressing plate technology, the thickness of the door panel is enhanced, making it more stable under environmental changes such as vibration, ensuring the accuracy of the magnetic field distribution and the alarm system. The stability of the door panel structure not only improves the performance of the security gate but also extends its service life. In terms of production, the fixed mold process simplifies the production process of the door panel and improves production efficiency.

[0009] To solve the above technical problems, the present invention provides the following technical solutions: On the one hand, a three-layer pressing plate door panel structure for a security gate, which is composed of an outer door panel, an inner door panel, and a door panel for fixing the coil. The three door panels are tightly bonded by glue and formed by a three-layer pressing plate process;

[0010] The outer door panel is used to support the security gate and resist external collisions, friction, and chemical corrosion to protect the internal structure. There are screw holes reserved at the top of the outer door panel for connecting the door body structure and wire-passing openings for wiring to the host, and it can be customized into various unique shapes according to the personalized needs of different customers and the diverse requirements of the appearance of security gates in various places;

[0011] The inner door panel is also used to support the security gate, cooperate with the outer door panel, jointly enhance the overall stability of the door panel, ensure the stability of the security gate and the internal coil of the security gate during use, and guarantee the stability of the operation of the internal coil of the security gate;

[0012] The door panel for fixing the coil is used to fix the coil position to ensure the stability of the magnetic field, and there are grooves matching the coil preset on the door panel for fixing the coil. The grooves are used to accommodate and fix the coil and are manufactured by a fixed mold process to make the position, size, and shape of the grooves match the coil.

[0013] Furthermore, the door panel also includes a transmitting coil, a receiving coil, a compensation coil, and a shielding layer for effectively generating and receiving electromagnetic signals to detect metal objects.

[0014] Furthermore, screw holes for connecting the door structure and wire passing openings for routing wires to the host are reserved at the top of the outer door panel, and the rest of the area remains flat;

[0015] The top of the inner door panel is also equipped with screw holes and wire passing openings;

[0016] In the door panel for fixing the coil, grooves matching the coil are preset, and screw holes and wire passing openings are reserved. The grooves are used to place the transmitting coil, detection coil, and compensation coil to ensure the functional integrity of the door panel.

[0017] Furthermore, the door panel for fixing the coil adopts a fixed mold process. Grooves are dug in advance at the predetermined coil placement positions, and the coil is fixed in the grooves through a positioning technology. The positioning technology designs corresponding positioning structures according to the position, shape, and size of the coil. When installing the coil, the coil is aligned with the groove to make the coil closely combined with the positioning. After installation, the fixing condition of the coil is checked to ensure that the coil is firm and reliable, preventing loosening and displacement.

[0018] Furthermore, during the pressing process of the three-layer pressing process, the temperature, pressure, and time are controlled. In the initial stage of pressing, the temperature is increased to make the glue reach the best fluidity, which can fully fill the gaps between the three-layer door panels and ensure the bonding effect. During the pressing process, the temperature is gradually decreased to make the glue solidify and form. The pressure is applied in a uniformly distributed manner.

[0019] On the other hand, a method for stably fixing the coil of the three-layer pressing door panel of the security inspection door. The specific steps of this method are as follows:

[0020] S100, Groove manufacturing: According to the design of the security inspection door and the specifications of the coil, grooves are manufactured on the door panel for fixing the coil through a fixed mold process, and an ultrasonic-assisted processing process is utilized;

[0021] S200, Coil inspection: Before installing the coil into the groove, the coil is positioned. The coil is placed in the sheath to precisely fix the position and shape of the coil;

[0022] S300, Positioning and fixing: The coil is fixed in the groove by using a positioning technology. Wire passing openings are provided at the edges of the groove. At the same time, the precise positioning of the groove and the interlayer adhesion of the glue ensure that the fixing force on the coil is uniformly distributed, ensuring that the coil will not displace in all directions;

[0023] S400, Gap filling and sealing: After the positioning and fixing of the coil are completed, the gaps between the coil and the groove are filled and sealed. Glue is used as the sealing material and is evenly filled into the gaps between the coil and the groove;

[0024] S500, Detection and Adjustment: Conduct a comprehensive inspection and adjustment on the door panel with the coil installed, and detect the magnetic field distribution generated by the coil.

[0025] Furthermore, during the manufacturing process of the S100 groove, ultrasonic assistance is introduced. The ultrasonic vibration is applied to the cutting tool, causing the cutting tool to generate high-frequency vibration during the cutting process, which can effectively break the chips. Parameters such as cutting force, vibration amplitude, and machining temperature are monitored in real time, and the frequency and amplitude of the ultrasonic vibration are adjusted according to the parameters to ensure the stability and machining quality of the machining process.

[0026] Furthermore, during the manufacturing process of the S100 groove, a laser positioning device and a coordinate measuring machine are used to ensure the position accuracy of the groove. When the mold is clamped to the processing equipment, the initial position of the mold is accurately measured using the laser positioning device. During the processing process, the size and position of the groove are measured in real time through the coordinate measuring machine, and the processing parameters are adjusted in a timely manner according to the measurement results. At the same time, closed-loop control is performed on the processing equipment, and the measured deviation is fed back to the control system of the processing equipment to adjust the movement trajectory of the cutting tool.

[0027] Compared with the prior art, the structure of the three-layer laminated board door panel of the security inspection door and the coil stable fixing method have the following beneficial effects:

[0028] First, the three-layer laminated board door panel structure proposed by the present invention combines the fixed mold process and the clamping technology, which can pre-dig a groove at the predetermined position of the coil and firmly embed the coil into the groove through a precisely set sheath, effectively avoiding the problem of coil displacement caused by screw loosening. At the same time, since the position, size, and shape of the groove are customized according to the coil characteristics, the stability and consistency of the coil after installation are ensured. Moreover, this method simplifies the coil installation steps, reduces the errors caused by human factors, improves the degree of automation on the production line, and is conducive to large-scale production and quality control.

[0029] Second, by introducing the three-layer laminated board technology and the fixed mold process, the present invention not only improves the manufacturing accuracy of the security inspection door panel, but also greatly simplifies the production process. Specifically, the outer door panel, the middle door panel for fixing the coil, and the inner door panel can be manufactured independently, making them more beautiful and flat. Each door panel can be optimized according to its specific function, and the three door panels are tightly bonded together using special glue to make the door panel thicker and more stable, forming a whole. During this process, complex screw fixing processes are no longer required, reducing the assembly time and labor costs, avoiding subsequent processing steps, and improving the production efficiency.

[0030] Other advantages, objects, and features of the present invention will be set forth in part in the following description, and in part will be obvious to those skilled in the art based on a study of the following, or may be learned from practice of the invention. Brief Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 Flowchart of the process for manufacturing the door panel with a three-layer pressing plate structure of an X-ray security door in Embodiment 1;

[0033] Figure 2 Design drawing of the outer door panel structure under the application of the three-layer pressing plate technology in Embodiment 1;

[0034] Figure 3 Design drawing of the inner door panel structure under the application of the three-layer pressing plate technology in Embodiment 1;

[0035] Figure 4 Design drawing of the door panel structure for fixing the coil under the application of the three-layer pressing plate technology in Embodiment 1;

[0036] Figure 5 Flowchart of a method for stably fixing the coil of the door panel with a three-layer pressing plate of an X-ray security door in Embodiment 2. Detailed Description of the Embodiments

[0037] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific embodiments, structures, features, and effects of the present invention as follows.

[0038] Embodiment 1

[0039] This embodiment focuses on a door panel structure of an X-ray security door with a three-layer pressing plate, and details its manufacturing process. The door panel structure consists of an outer door panel, an inner door panel, and a door panel for fixing the coil. It is pressed by a three-layer pressing plate process and cooperates with a fixed mold process and a positioning technology to fix the coil. The manufacturing process includes steps such as manufacturing each layer of the door panel, fixing the coil, and pressing the door panel. After completion of the manufacturing, a comprehensive test is carried out on the door panel, enhancing the market adaptability of the X-ray security door.

[0040] The outer door panel mentioned above shall have good mechanical strength, corrosion resistance and appearance plasticity to resist external collisions, friction and chemical corrosion, meet the appearance design requirements in different scenarios, and maintain a certain toughness to effectively cope with various complex usage environments. In the manufacturing process, a CNC machining center is used to process the outer door panel. According to the design requirements, the shape of the outer door panel is precisely fabricated. Screw holes for connecting the door body structure and wire-passing openings for wiring to the host are reserved at the top of the outer door panel, and the remaining areas are kept flat to ensure a good appearance effect. The positions and sizes of the screw holes and wire-passing openings are precisely calculated to ensure accurate docking with the door body structure and wiring system. During the processing, the processing accuracy is strictly controlled to meet the high-quality requirements of the security inspection door.

[0041] The main function of the inner door panel is to support the security inspection door. The three-layer thickened door panel structure significantly improves the stability of the security inspection door under conditions such as wind and vibration. During the processing of the inner door panel, the shape of the inner door panel is precisely fabricated through a CNC machining center, and corresponding screw holes and wire-passing openings are machined at the top to match the outer door panel. Since the inner door panel has a high requirement for flatness, after the processing is completed, the flatness of the door panel is detected, measured with a flatness measuring instrument, and undergoes fine grinding and polishing treatments to ensure the quality of the inner door panel.

[0042] The door panel for fixing the coil is a key part to ensure the stability of the magnetic field. Its manufacturing precision directly affects the fixing effect of the coil and the performance of the security door. During the manufacturing process, according to the specifications and layout of the coil, a die-casting process is used to manufacture grooves on the door panel that match the coil, ensuring that the position, size, and shape of the grooves precisely match the coil. During the manufacturing of the door panel for fixing the coil, an ultrasonic-assisted machining technology is introduced. Ultrasonic vibration is applied to the tool, causing the tool to generate high-frequency vibration during cutting, which can effectively break chips, reduce cutting force, improve machining precision and surface quality. During the machining process, parameters such as cutting force, vibration amplitude, and machining temperature are monitored in real time. These parameters are transmitted to the control system through sensors. The control system automatically adjusts the frequency and amplitude of the ultrasonic vibration according to the preset parameter range to ensure the stability of the machining process and machining quality. At the same time, a laser positioning device and a coordinate measuring machine are used to ensure the position accuracy of the grooves. When the mold is clamped to the machining equipment, the initial position of the mold is precisely measured using the laser positioning device. During the machining process, the size and position of the grooves are measured in real time by the coordinate measuring machine. According to the measurement results, the machining parameters are adjusted in a timely manner. At the same time, closed-loop control is performed on the machining equipment, and the measured deviation is fed back to the control system of the machining equipment to automatically adjust the movement trajectory of the tool, ensuring that the position, size, and shape of the grooves meet the design requirements. After the grooves are manufactured, screw holes and wire-passing openings are reserved on the door panel for fixing the coil. The positions of the screw holes and wire-passing openings correspond to the outer door panel and the inner door panel to ensure smooth connection and wiring during door panel assembly.

[0043] To ensure the tight adhesion between the three-layer door panels, a special glue is used to fill and seal the gap between the coil and the groove, evenly filling it into the void between the coil and the groove. The manufactured outer door panel, inner door panel, and door panel for fixing the coil are placed in sequence on a special pressing equipment for pressing. Before pressing, the surfaces of the three-layer door panels are cleaned to remove impurities such as dust and oil stains on the surface to ensure the bonding effect of the glue. During the pressing process, the temperature, pressure, and time are precisely controlled. In the initial stage of pressing, the temperature is increased to make the glue reach the best fluidity, enabling it to fully fill the tiny gaps between the three-layer door panels and ensuring the bonding effect. The pressure is applied in a uniformly distributed manner to ensure that the three-layer door panels can fit tightly. As the pressing process progresses, the temperature is gradually decreased to make the glue solidify. During the glue solidification process, a certain pressure is maintained to ensure the firm bonding between the door panels. The solidification time is determined according to the performance of the glue and the thickness of the door panel. After solidification is completed, the pressure is slowly released, and the pressed door panel is taken out.

[0044] Before installing the coil into the groove of the door panel that fixes the coil, check the coil and place it in a specially designed cover. The cover is customized according to the shape and size of the coil, and can accurately fix the position and shape of the coil to ensure that the coil will not be displaced or deformed during the pre-positioning process. The coil is fixed in the groove using the clamping technology. During the fixing process, align the coil with the groove to ensure that the coil fits tightly with the groove to prevent loosening and displacement. Special glue is injected between different door panel layers to achieve all-round and stable locking of the coil to ensure that the coil will not be displaced in any direction.

[0045] After the coil is fixed in place, use a standard metal test block to conduct a metal detection accuracy test in the detection area of ​​the security door. Pass metal test blocks of different sizes, shapes and materials through the security door at different speeds and angles, and record the alarm status of the security door.

[0046] In summary, if Figure 1 As shown, in the actual production process, the three-layer laminated door panel structure of the security door provided in the first embodiment includes the following three steps in its manufacturing process: firstly, three-layer door panels and special glue are manufactured separately, then the coils are wound and placed in the grooves, and finally the door panels are bonded with special glue, wherein:

[0047] The production of the three-layer door panel includes the production of an outer door panel, an inner door panel and a fixed coil door panel. The production of the outer and inner door panels is intended to meet the customer's needs for aesthetics and scene adaptability, while ensuring the flatness of the door panels to meet the quality standards of the overall security door. The production of the fixed coil door panel focuses on meeting the needs of high-performance magnetic fields. Each set of security doors with height, width and depth dimensions has its corresponding coil groove design parameters.

[0048] The special glue presses and combines three layers of door panels with different functions;

[0049] In the production of the door panel for fixing the coil, this embodiment adopts a fixed mold process and a groove clamping technology. The fixed mold process digs a groove at a predetermined position of the door panel, and then the coil is fixed in the groove by the clamping technology;

[0050] Further, regarding the mold design of the door panel, such as Figures 2 to 4 As shown, this embodiment describes a security door panel structure design scheme manufactured using three-layer laminate technology;

[0051] like Figure 2 The figure shows the structural design of the outer door panel under the three-layer laminate technology. Preferably, the top of the outer door panel is reserved with screw holes for connecting the door structure and openings for wiring to the host, and the rest of the area needs to be kept flat to meet the high quality standards of the security door and cater to the customer's personalized needs for aesthetics and scene adaptability.

[0052] As Figure 3 shown, the structural design of the inner door panel under the three-layer laminate technology is presented. Preferably, the inner door panel is also equipped with screw holes and wire-passing openings at the top, and the other parts need to ensure flatness to meet the quality specifications of the security door;

[0053] As Figure 4 shown, the structural design of the door panel with a fixed coil under the three-layer laminate technology is presented. Preferably, in the structure of the door panel with a fixed coil, in addition to the reserved screw holes and wire-passing openings, its core feature lies in the preset grooves, which are designed specifically for placing the transmitting coil, detection coil, and compensation coil. This design not only ensures the functional integrity of the door panel but also meets the requirements of the security door for accuracy and performance.

[0054] Finally, in this embodiment, through the careful design and manufacture of the three-layer laminate door panel structure of the security door, strict control is exercised over every link, from the production of each layer of the door panel, the installation and fixation of the coils, to the pressing of the door panel, ensuring the quality and performance of the door panel structure, and fully verifying the advantages of the door panel structure of the present invention in terms of stability, anti-interference, and metal detection accuracy.

[0055] Embodiment 2

[0056] As Figure 5 shown, this embodiment presents the specific steps of a method for stably fixing the coils of the three-layer laminate door of a security door. This method realizes the stable fixation of the coils through groove manufacturing, coil inspection, clamping fixation, gap filling and sealing, and detection and adjustment, effectively improving the stability of coil fixation, enhancing the performance of the security door, completely eliminating the uncertainty of previous manual operations, and making the door panel production process highly standardized. It not only simplifies the cumbersome production steps but also provides strong support for the efficient production and reliable operation of the security door, ensuring that each security door can meet unified and strict standards.

[0057] First, enter the groove manufacturing stage (S100). According to the design parameters of the security door and the coil specifications, use the fixed mold process to manufacture grooves on the door panel with a fixed coil. During processing, introduce ultrasonic-assisted machining technology, apply ultrasonic vibration to the cutting tool, so that the cutting tool vibrates at high frequency during cutting, effectively breaking the chips, reducing the cutting force, and real-time monitoring parameters such as cutting force, vibration amplitude, and machining temperature. Automatically adjust the frequency and amplitude of ultrasonic vibration according to parameter changes. During the processing, the coordinate measuring machine measures the size and position of the grooves in real time, and the measurement data is fed back to the processing equipment control system in real time to adjust the tool movement trajectory to ensure the groove manufacturing accuracy.

[0058] Then, enter the coil inspection stage (S200). Place the coil in a specially customized coil sheath, which is designed according to the shape and size of the coil. Before positioning, conduct a comprehensive inspection of the coil to ensure that the set coil parameters remain unchanged, improving the accuracy and efficiency of pre-positioning.

[0059] Subsequently, enter the clamping and fixing stage (S300). Accurately place the coil into the groove and closely fit it with the corresponding structure of the coil to fix the coil in the groove. To ensure uniform distribution of the fixing force on the coil, use the clamping technology to fix the coil in the groove. During the fixing process, align the coil with the groove to ensure tight fitting between the coil and the groove, preventing loosening and displacement. Inject special glue between different door panel layers to achieve a comprehensive and stable locking of the coil, ensuring that the coil will not displace in any direction.

[0060] Next, enter the gap filling and sealing stage (S400). Select special glue as the sealing material and evenly fill the glue into the gap between the coil and the groove to ensure uniform filling and avoid the occurrence of bubbles or insufficient filling. After filling, cure the glue to form a firm sealing layer to prevent impurities such as dust and moisture from entering, while also playing a role in assisting in fixing the coil and dissipating heat.

[0061] Finally, enter the detection and adjustment stage (S500). Detect the magnetic field distribution of the door panel with the coil installed, measure the magnetic field strength and direction at different positions and directions, and compare the measured data with the preset standards to ensure that the coil can remain stable in various environments.

[0062] In summary, for the method of stably fixing the coil of the three-layer pressed board door panel of the security inspection door in this embodiment, through the precise operations and strict controls in stages such as groove manufacturing, coil inspection, clamping and fixing, gap filling and sealing, and detection and adjustment, the stable fixing of the door panel and the coil is achieved, improving the stability of the coil and the overall performance of the security inspection door. At the same time, the production process is simplified, and the labor cost and error are reduced.

[0063] The above is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to form an equivalent embodiment with equivalent changes, but as long as the technical content of the present invention is not departed from, any brief modifications, equivalent changes, and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A three-layer pressed plate door panel structure for a security inspection door, characterized in that, The door panel structure is composed of an outer door panel, an inner door panel, and a door panel for fixing coils. The three-layer door panels are tightly bonded by glue and are formed by a three-layer pressing process; The outer door panel is used to support the security door and resist external collisions, friction, and chemical corrosion to protect the internal structure. There are screw holes for connecting the door body structure and wire-passing openings for wiring to the host reserved at the top of the outer door panel. It can be customized into various unique shapes according to the personalized needs of different customers and the diverse requirements for the appearance of security doors in various places; The inner door panel is also used to support the security door and cooperate with the outer door panel to jointly enhance the overall stability of the door panel, ensure the stability of the security door and the internal coils of the security door during use, and guarantee the stability of the operation of the internal coils of the security door; The door panel for fixing coils is used to fix the position of the coils to ensure the stability of the magnetic field. There are grooves matching the coils preset on the door panel for fixing coils. The grooves are used to accommodate and fix the coils and are manufactured by a fixed mold process to make the position, size, and shape of the grooves match the coils.

2. The structure of the three-layer laminate door panel of the security inspection door according to claim 1, wherein, The door panel also includes a transmitting coil, a receiving coil, a compensation coil, and a shielding layer, which are used to effectively generate and receive electromagnetic signals to detect metal objects.

3. The three-layer laminated panel door structure of a security inspection door according to claim 1, characterized in that, There are screw holes for connecting the door body structure and wire-passing openings for wiring to the host reserved at the top of the outer door panel, and the rest of the area remains flat; The top of the inner door panel is also equipped with screw holes and wire-passing openings; There are grooves matching the coils preset in the door panel for fixing coils, and screw holes and wire-passing openings are reserved. The grooves are used to place the transmitting coil, detection coil, and compensation coil to ensure the functional integrity of the door panel.

4. The three-layer laminated board door panel structure of a security inspection door according to claim 1, characterized in that, The door panel for fixing coils is manufactured by a fixed mold process. Grooves are dug in advance at the predetermined coil placement position, and the coils are fixed in the grooves by a positioning technology. The positioning technology designs corresponding positioning structures according to the position, shape, and size of the coils. When installing the coils, the coils are aligned with the grooves to make the coils closely combine with the positioning. After the installation is completed, the fixing condition of the coils is checked to ensure that the coils are firm and reliable and prevent loosening and displacement.

5. The structure of the three-layer laminated door panel of the security inspection door according to claim 1, wherein, During the pressing process of the three-layer pressing process, the temperature, pressure, and time are controlled. In the initial stage of pressing, the temperature is increased to make the glue reach the best fluidity, which can fully fill the gaps between the three-layer door panels to ensure the bonding effect. The temperature is gradually decreased during the pressing process to make the glue solidify and form. The pressure is applied in a uniformly distributed manner.

6. A method for stably fixing the coil of the three-layer laminated panel of the security door, applicable to the structure of the three-layer laminated panel of the security door described in any one of claims 1-5, characterized in that, The specific steps of this method are as follows: S100. Groove manufacturing: According to the design of the security door and the specifications of the coils, grooves are manufactured on the door panel for fixing coils by a fixed mold process, and an ultrasonic-assisted processing process is used; S200. Coil inspection: Before installing the coils into the grooves, positioning treatment is performed on the coils. The coils are placed in a sheath to accurately fix the position and shape of the coils; S300, Clamping and fixing: The coil is fixed in the groove by using clamping technology. There are wire-passing openings at the edge of the groove. At the same time, the precise positioning of the groove and the interlayer adhesion of the glue ensure that the fixing force on the coil is evenly distributed, ensuring that the coil will not be displaced in all directions; S400, Gap filling and sealing: After the coil is clamped and fixed, the gap between the coil and the groove is filled and sealed. Glue is used as the sealing material and is evenly filled into the gap between the coil and the groove; S500, Detection and adjustment: The door panel with the coil installed is comprehensively detected and adjusted, and the magnetic field distribution generated by the coil is detected.

7. A method for stably fixing the coil of the three-layer laminated door panel of the security inspection door according to claim 6, characterized in that, During the manufacturing process of the groove in S100, ultrasonic assistance is introduced. Ultrasonic vibration is applied to the tool, causing the tool to generate high-frequency vibration during cutting, which can effectively break the chips. The parameters of cutting force, vibration amplitude, and machining temperature are monitored in real time, and the frequency and amplitude of the ultrasonic vibration are adjusted according to the parameters to ensure the stability of the machining process and the machining quality.

8. A method for stably fixing the coil of a three-layer laminated door panel of a security inspection door according to claim 6, characterized in that, During the manufacturing process of the groove in S100, a laser positioning device and a coordinate measuring machine are used to ensure the position accuracy of the groove. When the mold is clamped to the processing equipment, the initial position of the mold is accurately measured by the laser positioning device. During the machining process, the size and position of the groove are measured in real time by the coordinate measuring machine, and the machining parameters are adjusted in a timely manner according to the measurement results. At the same time, closed-loop control is performed on the processing equipment, and the measured deviation is fed back to the control system of the processing equipment to adjust the movement trajectory of the tool.

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