Regulation and control method for precise compensation and efficient production of security door magnetic field

Abstract

The invention discloses a regulation and control method for security check door magnetic field accurate compensation and efficient production, and relates to the technical field of security check device.The regulation and control method comprises the specific steps that S100, magnetic field detection and positioning are conducted, specifically, distribution of a magnetic field around a security check door detection coil is analyzed in detail through electromagnetic field simulation software and a magnetic field measuring instrument, the position and the shape of the compensation coil are planned through comprehensive magnetic field analysis and regulation and control area selection, the compensation magnetic field is generated by using the reversely wound coil, the current induced by the transmitting coil in the detection coil when no metal passes through is effectively counteracted, the false alarm rate is greatly reduced, and meanwhile, the detection accuracy is improved. In addition, by constructing a standardized production system, unified and mechanical production of the security door is achieved, the production efficiency is improved, the production cost is reduced, powerful support is provided for large-scale application of the security door, the problem that the performance of the security door is unstable is solved, and innovation of the security door production technology is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of security inspection equipment, and in particular to a control method for accurate magnetic field compensation and efficient production of a security inspection door. Background Art

[0002] In modern society, with the increasing awareness of security, various places such as airports, stations, museums, and large-scale events have an increasingly urgent need for security inspections. As an important security inspection device, security doors detect metal objects through the principle of magnetic field induction, thereby realizing non-contact inspection of items carried by people. With the rapid development of electromagnetic and electronic technology, the design and production technology of security doors are also constantly improving to adapt to the increasingly complex and diverse security inspection needs, especially in high-tech fields and sensitive areas, which put forward higher requirements on the performance and accuracy of security doors.

[0003] Although traditional security doors have played an important role in ensuring public safety, their technology still has certain shortcomings. First, the magnetic field calibration operation of traditional security doors is completely dependent on manual labor, and the cumbersome production process leads to low production efficiency. Secondly, the system error still cannot be completely eliminated, which seriously affects the detection accuracy. In the production process, the magnetic field calibration operation of each device is completely dependent on manual completion. The operation process is cumbersome and complicated, and it is difficult to establish a unified production standard, which greatly hinders the realization of large-scale, automated production and has extremely low production efficiency. In addition, in the process of manual calibration of the magnetic field, the direction needs to be adjusted multiple times, which not only consumes a lot of time and manpower, but also easily leads to a high error rate, further reducing the reliability and stability of the security door, and it is difficult to meet the modern society's demand for efficient and accurate security equipment.

[0004] Therefore, the development of a control method for accurate magnetic field compensation and efficient production of security doors will greatly promote the development of security door technology and provide safer, more efficient and convenient security solutions for various places. Summary of the invention

[0005] The purpose of the present invention is to make up for the shortcomings of the prior art and to provide a control method for precise magnetic field compensation and efficient production of security doors. The method includes magnetic field detection and positioning, coil planning and preparation, door panel groove design, coil installation and protection, and production system construction steps. The control area is determined by electromagnetic field simulation and measuring instruments, the compensation coil is planned and prepared according to the electromagnetic field principle, the door panel structure is designed and the groove is created, the coil is installed using professional technology and a comprehensive inspection is carried out, and finally a database is constructed to realize the unified production of security doors.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a control method for accurate magnetic field compensation and efficient production of security inspection doors, the specific steps of the control method are:

[0007] S100, magnetic field detection and positioning: The magnetic field distribution around the security door detection coil is analyzed through electromagnetic field simulation software and magnetic field measurement instruments, and the location of the elliptical control area is determined by combining the security door structure, coil layout and space constraints;

[0008] S200, coil planning and preparation: determine the position of the compensation coil in combination with the position of the elliptical control area, determine the number of turns of the compensation coil according to experimental data, wind the compensation coil by combining multi-layer tight winding with segmented winding, and use the winding density function to represent the winding density along the coil contour;

[0009] S300, door panel groove design: The door panel structure is designed according to the principles of mechanical design and material mechanics, and grooves for installing the transmitting coil, detection coil and compensation coil are created according to the coil size at the expected location of the coil;

[0010] S400, coil installation protection: Connect the polyimide insulated sheathed wire to the coil through the crimping process and the connection terminal, fix the coil connected with the sheathed wire in the groove with the fixing clip and the positioning pin, plan the line direction to avoid cross winding, and conduct a comprehensive inspection after the installation is completed;

[0011] S500, production system construction: analyze and optimize the parameters of compensation coils for security doors of different sizes, build a database, generate automated production programs through CAD / CAM, and use mechanized means to uniformly produce security doors.

[0012] Furthermore, the specific steps of determining the elliptical control area in the magnetic field detection and positioning in S100 are as follows:

[0013] (1) Preliminarily set the candidate area with the detection coil as the center;

[0014] (2) Analyze the magnetic field and eliminate inappropriate spaces based on the magnetic field propagation characteristics, attenuation laws, and spatial constraints;

[0015] (3) Comprehensively consider the optimization of magnetic field uniformity, stability and spatial matching to establish the optimization function F, the formula is: F = w 1 ·U(B)+w 2 ·S(B)+w 3 C(S), where U(B) represents the uniformity index of the magnetic field strength in the candidate area, S(B) represents the stability index of the magnetic field strength, C(S) represents the degree of compliance of the candidate area with the spatial constraints, and w 1 、w 2 and w 3 is the weight coefficient, which is used to iteratively adjust the candidate region;

[0016] (4) Determine the elliptical region control area based on the iteration results.

[0017] Furthermore, in the S100, the detection coil in the magnetic field detection positioning is a middle rectangle with semicircles connected at the top and bottom, and the size of the middle rectangle of the detection coil is determined, and the width of the rectangle is set to W. rect , the working frequency of the security door is f, and the minimum size of the target detection object is S min , introducing the frequency correction factor γ and the size correction factor δ, the calculation formula is: where f ref is the reference operating frequency; let the length of the rectangle be L rect , the electromagnetic noise interference intensity in the working environment of the security door is E noise , the magnetic field strength of the security door itself is B strength , the interference correction factor is α, the magnetic field strength correction factor is β, and the calculation formula is: Where E ref is the reference electromagnetic noise interference intensity, B std is the standard magnetic field strength, and the distance between the long side of the rectangular part of the detection coil and the center of the detection coil is The distance between the wide side of the rectangular part of the detection coil and the center of the detection coil is The radius of the prototype semicircle at both ends of the detection coil is Assume that the number of detection coils is n, which is determined according to the effective detection area length L of the security door and the expected coverage length l of a single detection coil. The calculation formula is: Where " represents rounding up; let the coordinates of the center position of the detection coil be (x i ,y i ), the center of the bottom of the security door is the coordinate origin (0, 0), the width of the security door is W, and the height is H. For the i-th detection coil (i=1,2,…,n), its center is in the horizontal direction, and the detection coils are evenly distributed in the middle of the width of the security door. The calculation formula is: In the vertical direction, the center distance between adjacent detection coils is d y , then y i =(i-1)d y ,in

[0018] Furthermore, in the S200, the compensation coil in the coil planning preparation is a middle rectangle with semicircles connected at the top and bottom. The compensation coil generates a compensation magnetic field through a reversely wound coil to offset the current induced in the detection coil by the transmitting coil when no metal passes, thereby reducing false alarms.

[0019] Furthermore, in the S200, the positioning of the compensation coil in the coil planning preparation, assuming that the center coordinates of the security door are (0, 0), and the center of the compensation coil is also at (0, 0), the calculation formula is: where x c and c They represent the horizontal and vertical coordinates of the compensation coil center in the security door coordinate system, which are used to determine the position of the compensation coil in the plane of the security door. H represents the height of the security door, W is the width of the security door, r is the radius of the detection coil, and α 0 and β 0 It is a coefficient related to the magnetic field energy distribution. It is obtained through experimental calibration of security door models, materials and environmental factors. It is determined according to the specific models, internal structures, materials used and surrounding environmental factors of different security doors. θ represents the rotation angle of the compensation coil in the magnetic field, and its value range is [0,2π).

[0020] Furthermore, in the S200, the compensation coil size is determined in the coil planning and preparation, and the length of the middle rectangle of the compensation coil is determined. Assuming the length of the middle rectangle of the detection coil is L d , the effective influence range coefficient of the detection coil in the magnetic field is k a , the value range is 0.6-1.0, which is related to the performance of the detection coil itself and the magnetic field environment. The magnetic field non-uniformity adjustment factor of the security door is m 1 According to the actual measured magnetic field inhomogeneity, the length L of the middle rectangle of the compensation coil is calculated as follows: L = k a ×L d ×1+m 1 ); Determination of the width of the middle rectangle of the compensation coil, assuming that the width of the middle rectangle of the detection coil is W d , the average width of the expected detection object in the security gate channel is W obj , the magnetic field strength compensation proportional coefficient is k b , the value range is 0.8-1.2, determined according to the ratio between the required compensation magnetic field strength and the existing magnetic field strength, the width W of the rectangle in the middle of the compensation coil r The calculation formula is: The distance between the long side of the compensation coil rectangle and the center of the compensation coil is The distance between the wide side of the compensation coil rectangle and the center of the compensation coil is The radius of the prototype semicircle at both ends of the compensation coil is

[0021] Furthermore, in the S200, the winding density function ρ(x) is used to represent the winding density along the coil contour in the coil planning preparation, and the formula is: where k dens is the normalization constant, y ′is the derivative of the curve function y with respect to x, ω is the phase parameter, which affects the fluctuation frequency of the winding density with the change of position x, φ is the frequency parameter, which is used to adjust the initial phase of the sin function, and e is a specific length parameter on the coil profile.

[0022] Furthermore, in the S300, in the door panel groove design, a copper foil shielding layer with a thickness of 0.5-1 mm is set on the inner wall of the groove, the shielding layer is fixed to the inner wall of the groove by gluing, and a rubber buffer layer with a thickness of 2-3 mm is set between the shielding layer and the groove wall.

[0023] Furthermore, in the S400, the thickness of the insulation layer of the polyimide insulated sheathed wire in the coil installation protection is 0.3-0.5 mm. When connecting the coil and the sheathed wire, a professional crimping device with model XRJ-01 is used for crimping. The crimping force of the crimping device is 500N-800N, and the connecting part is heated during the crimping process. The heating temperature is 150℃-180℃, and the heating time is 30-60 seconds.

[0024] Compared with the prior art, the control method for accurate magnetic field compensation and efficient production of security doors has the following beneficial effects:

[0025] 1. The present invention plans the position and shape of the compensation coil through comprehensive magnetic field analysis and control area selection, and uses the reversely wound coil to generate a compensation magnetic field, which effectively offsets the current induced in the detection coil by the transmitting coil when no metal passes through, thereby greatly reducing the false alarm rate. At the same time, the present invention also realizes the unified and mechanized production of security doors by constructing a standardized production system, which not only improves production efficiency but also reduces production costs, providing strong support for the large-scale application of security doors, not only solving the problem of unstable performance of security doors, but also promoting the innovation of security door production technology.

[0026] 2. The present invention accurately plans and manufactures compensation coils, uses the electromagnetic field principle and the elliptical control area to position the compensation coil, combines the elliptical parameters and the curve function of the magnetic field gradient to describe the coil shape, and uses the winding density function to represent the winding density along the coil contour, thereby achieving precise manufacturing of the compensation coil, which not only improves the compensation effect, further enhances the accuracy and reliability of security inspection, not only optimizes the design of security inspection doors, but also provides new ideas and methods for the development of security inspection technology.

[0027] Other advantages, objectives and features of the present invention will be set forth in part in the following description and, in part, will be apparent to those skilled in the art based on an examination of the following or may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a flow chart of a control method for accurate magnetic field compensation and efficient production of security doors;

[0030] Figure 2 It is a framework diagram of a control method for accurate magnetic field compensation and efficient production of security doors;

[0031] Figure 3 This is a schematic diagram of the security door coil and door panel structure. DETAILED DESCRIPTION

[0032] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0033] Embodiment 1:

[0034] Large shopping mall security door application

[0035] For the security doors of large shopping malls, such as Figure 3 As shown, the overall structure is a regular rectangular frame. The door panel frame is solid, providing stable support for the internal coil. At a specific position of the door panel, the transmitting coil, compensation coil and detection coil are arranged in an orderly manner.

[0036] Due to the complex environment of the shopping mall, there are many electronic devices and metal structures such as elevators, escalators, and various metal shelves. Although these factors will interfere with the magnetic field of the security door, we first use electromagnetic field simulation software to simulate the magnetic field conditions in different scenarios, and combine high-precision magnetic field measuring instruments to accurately collect magnetic field data of various parts of the security door. A larger initial area is delineated as the candidate area with the detection coil as the center. The rectangular size of the detection coil is determined, and the rectangular width W rect , assuming the working frequency of the security door is f, and the minimum size of the target detection object is S min , introducing the frequency correction factor γ and the size correction factor δ, the calculation formula is: where f ref is the reference operating frequency, the rectangular length L rect , assuming that the electromagnetic noise interference intensity in the working environment of the security door is E noise , the magnetic field strength of the security door itself is B strength, the interference correction factor is α, the magnetic field strength correction factor is β, and the calculation formula is: Where E ref is the reference electromagnetic noise interference intensity, B std is the standard magnetic field strength, and the distance between the long side of the rectangular part of the detection coil and the center of the detection coil is The distance between the wide side of the rectangular part of the detection coil and the center of the detection coil is The radius of the prototype semicircle at both ends of the detection coil is The number of detection coils n is determined based on the effective detection area length L of the security door and the expected coverage length l of a single detection coil. The calculation formula is: Where " represents rounding up, the center position coordinate of the detection coil (x i ,y i ), assuming that the center of the bottom of the security door is the coordinate origin (0, 0), the width of the security door is W, and the height is H. For the i-th detection coil (i = 1, 2, ..., n), its center is in the horizontal direction, and the detection coils are evenly distributed in the middle of the width of the security door. The calculation formula is: In the vertical direction, the center distance between adjacent detection coils is d y , then y i =(i-1)d y ,in r is the radius of the semicircular part of the detection coil. In this process, the spatial layout of the mall is fully considered, including the width of the channel, the height of the ceiling, and whether there are large metal structures around, and areas that may cause magnetic field anomalies are excluded. Then, the optimization function is established by comprehensively considering the optimization of magnetic field uniformity, stability and spatial matching. The formula is: F = w 1 ·U(B)+w 2 ·S(B)+w 3 C(S), after multiple adjustments and optimizations, the elliptical area outside the detection coil was finally determined as the control area.

[0037] The position of the compensation coil is determined in combination with the position of the elliptical control area. The position of the compensation coil is accurately determined. Combined with the specific structure and size of the security door, the size of the compensation coil is reasonably planned. The compensation coil is a middle rectangle connected to a semicircle at the top and bottom. The positioning of the compensation coil is very important. It needs to be placed in a place where it can offset the transmitting coil to the greatest extent without metal. The positioning of the compensation coil, assuming that the center coordinates of the security door are (0, 0), and the center of the compensation coil is also (0, 0), the calculation formula is: The calculation formula is:

[0038] where x c and cThey represent the horizontal and vertical coordinates of the compensation coil center in the security door coordinate system, which are used to determine the position of the compensation coil in the plane of the security door. H represents the height of the security door, W is the width of the security door, r is the radius of the detection coil, and α 0 and β 0 It is a coefficient related to the magnetic field energy distribution, which is determined according to the specific model, internal structure, materials used and surrounding environmental factors of different security doors. θ represents the rotation angle of the compensation coil in the magnetic field, and its value range is [0,2π). The length of the middle rectangle of the compensation coil is determined. Let the length of the middle rectangle of the detection coil be L d , the effective influence range coefficient of the detection coil in the magnetic field is k a , the value range is 0.6-1.0, which is related to the performance of the detection coil itself and the magnetic field environment. The magnetic field non-uniformity adjustment factor of the security door is m 1 According to the actual measured magnetic field inhomogeneity, the length L of the middle rectangle of the compensation coil is calculated as follows: L = k a ×L d ×1+m 1 ); Determination of the width of the middle rectangle of the compensation coil, assuming that the width of the middle rectangle of the detection coil is W d , the average width of the expected detection object in the security gate channel is W obj , the magnetic field strength compensation proportional coefficient is k b , the value range is 0.8-1.2, determined according to the ratio between the required compensation magnetic field strength and the existing magnetic field strength, the width W of the rectangle in the middle of the compensation coil r The calculation formula is: The distance between the long side of the compensation coil rectangle and the center of the compensation coil is The distance between the wide side of the compensation coil rectangle and the center of the compensation coil is The radius of the prototype semicircle at both ends of the compensation coil is The number of turns of the compensation coil is determined according to the experimental data. The winding is carried out by combining multi-layer tight winding with segmented winding, and the winding density function is used to achieve a reasonable distribution of winding density. The formula is: During the winding process, the winding density is appropriately increased in certain key locations, such as in areas close to the detection coil where magnetic field changes are more sensitive. This can enhance the magnetic field compensation capability, allowing the security door to more accurately identify whether metal objects have passed through during the detection process, effectively reducing the false alarm rate, improving the efficiency and reliability of shopping mall security checks, and providing customers with a safe and convenient shopping environment.

[0039] The door panel structure of the security door is designed according to the principles of mechanical design and material mechanics. At the predetermined position for placing the compensation coil, a suitable groove is created according to the size of the coil. A copper foil shielding layer with a thickness of 0.5-1 mm is arranged on the inner wall of the groove. The shielding layer is fixed to the inner wall of the groove by gluing, and a rubber buffer layer with a thickness of 2-3 mm is arranged between the shielding layer and the groove wall to ensure that the coil can be firmly installed therein and will not affect the overall strength and stability of the door panel. At the same time, the appropriate groove size is also conducive to the electromagnetic shielding between the coil and the door panel, reducing the influence of external interference on the coil magnetic field, further improving the performance of the security door, and ensuring the smooth progress of the safety management of the shopping mall.

[0040] Polyimide insulated sheathed wire is selected. The thickness of the insulation layer of the polyimide insulated sheathed wire is 0.4 mm. It is tightly connected to the compensation coil through professional crimping process and connection terminals. The professional crimping equipment model XRJ-01 is used for crimping. The crimping force of the crimping equipment is 600N, and the connection part is heated during the crimping process. The heating temperature is 160℃ and the heating time is 30-60 seconds. The polyimide insulated sheathed wire has good insulation performance and high temperature resistance, which can ensure the stable connection between the coil and the line during the long-term operation of the security door. Ensure that the security door is stable and reliable, and avoid the normal operation of the security door due to leakage or short circuit. Use fixing clips and positioning pins to accurately fix the coil connected with the sheathed wire in the groove of the door panel. At the same time, carefully plan the direction of the line to avoid cross-entanglement and prevent line failure. After the installation is completed, conduct a comprehensive and detailed inspection to ensure that the coil is firmly installed and the line connection is normal. Such installation protection measures can effectively improve the stability and reliability of the security door, reduce the probability of equipment failure, reduce maintenance costs, and ensure the continuous and efficient development of shopping mall security work.

[0041] The actual data of security doors in daily use in large shopping malls are collected, such as the flow of people in different time periods, the types of items carried, and the false alarms of security doors. During peak hours, the flow of people is large and the items carried by customers are diverse. The workload of security doors is large and false alarms are prone to occur. During non-peak hours, the situation is relatively different. These data are deeply analyzed, the compensation coil parameters of security doors of different sizes are optimized, and a corresponding database is established. Based on the database, accurate security door models are drawn using CAD software, and then the equipment control program is generated through CAM, thereby building an automated production process and using mechanized means to achieve efficient and unified production of security doors. In this way, security doors of different specifications are customized according to the actual needs of the shopping mall, and each security door is guaranteed to have high performance and stability, effectively reducing the false alarm rate of security doors in use in shopping malls, improving security inspection efficiency, and providing strong technical support for the safe operation of shopping malls.

[0042] To sum up, in the implementation process of security doors in large shopping malls, magnetic field detection and positioning are used to fully consider the complex environmental factors of the shopping mall, accurately determine the control area, and lay a solid foundation for subsequent work. In the coil planning and preparation stage, the compensation coil is rationally arranged according to scientific principles to effectively improve the magnetic field compensation effect. The door panel groove design follows the mechanical and mechanical principles to ensure that the coil is firmly installed and the door panel performance is maintained. The coil installation protective measures are effective to ensure that the line connection is reliable and there are no hidden dangers of failure. The production system is constructed with the help of big data and advanced technology to realize the customization and efficient production of security doors. By integrating various links, the false alarm rate is effectively reduced, creating a safe and orderly shopping environment for the shopping mall, strongly supporting the daily security management of the shopping mall, and protecting the safety interests of customers and merchants.

[0043] Embodiment 2:

[0044] As a place with densely populated and highly mobile population, security doors are crucial to ensuring safety. Their outlines are adapted to the space requirements of the station. In the internal structure, the positions of the transmitting coil, compensation coil and detection coil in the door panel are clearly identifiable and tightly integrated. Figure 3 As shown, there are a large number of metal facilities (such as metal railings, seats) and complex electronic equipment environments around the station, which will affect the magnetic field of the security gate.

[0045] For the station security gate, we first measured the size and position of the detection coil and the overall structure of the security gate in detail, set a larger candidate range with the detection coil as the target, and then screened the candidate area according to the propagation characteristics and attenuation law of the magnetic field in the station environment and the surrounding space constraints. We used professional magnetic field analysis tools to comprehensively evaluate the uniformity and stability indicators of the magnetic field and establish an optimization function. The formula is: F = w 1 ·U(B)+w 2 ·S(B)+w 3 C(S), through continuous iterative optimization, the elliptical area outside the detection coil is determined as the key control area.

[0046] The rectangular size of the detection coil is determined, and the width of the rectangle is W rect , assuming the working frequency of the security door is f, and the minimum size of the target detection object is S min , introducing the frequency correction factor γ and the size correction factor δ, the calculation formula is: Assume that the electromagnetic noise interference intensity in the working environment of the security door is E noise , the magnetic field strength of the security door itself is B strength , the interference correction factor is α, the magnetic field strength correction factor is β, and the calculation formula is: The distance between the long side of the rectangular part of the detection coil and the center of the detection coil is The distance between the wide side of the rectangular part of the detection coil and the center of the detection coil is The radius of the prototype semicircle at both ends of the detection coil is The number of detection coils n is determined based on the effective detection area length L of the security door and the expected coverage length l of a single detection coil. The calculation formula is: Assume that the center of the bottom of the security door is the coordinate origin (0, 0), the width of the security door is W, and the height is H. For the i-th detection coil (i=1, 2, ..., n), its center is in the horizontal direction, and the detection coils are evenly distributed in the middle of the width of the security door. The calculation formula is: In the vertical direction, the center distance between adjacent detection coils is d y , then y i =(i-1)d y ,in r is the radius of the semicircular part of the detection coil.

[0047] Combined with the position of the elliptical control area, the position of the compensation coil is determined, and the position of the compensation coil is accurately located. Assuming the center coordinates of the security door are (0, 0), the center of the compensation coil is also at (0, 0), and the calculation formula is: The calculation formula is: Combined with the size characteristics of the station security door, the compensation coil size is determined, and the length of the middle rectangle of the compensation coil is determined. Let the length of the middle rectangle of the detection coil be L d , the effective influence range coefficient of the detection coil in the magnetic field is k a , the value range is 0.6-1.0, which is related to the performance of the detection coil itself and the magnetic field environment. The magnetic field non-uniformity adjustment factor of the security door is m 1 According to the actual measured magnetic field inhomogeneity, the length L of the middle rectangle of the compensation coil is calculated as follows: L = k a ×L d ×(1+m 1 ); Determination of the width of the middle rectangle of the compensation coil, assuming that the width of the middle rectangle of the detection coil is W d , the average width of the expected detection object in the security gate channel is W obj , the magnetic field strength compensation proportional coefficient is k b , the value range is 0.8-1.2, determined according to the ratio between the required compensation magnetic field strength and the existing magnetic field strength, the width W of the rectangle in the middle of the compensation coil r The calculation formula is: The distance between the long side of the compensation coil rectangle and the center of the compensation coil is The distance between the wide side of the compensation coil rectangle and the center of the compensation coil is The radius of the prototype semicircle at both ends of the compensation coil is The number of turns of the compensation coil is determined based on experimental data, and the winding is carried out by combining multi-layer tight winding with segmented winding. According to the magnetic field requirements at different positions, the winding density function ρ(x) is used to represent the winding density along the coil contour. The formula is: For example, in areas where the magnetic field changes greatly near the detection coil, the winding density is increased to better achieve magnetic field compensation. The station security gates need to cope with the situation where a large number of passengers pass through quickly. Accurate magnetic field compensation can reduce false alarms, avoid passenger congestion and unnecessary inspections caused by false alarms, improve security inspection efficiency, and ensure smooth passage of passengers without reducing the quality of security inspections, providing strong guarantees for the safe operation of the station.

[0048] The door panel structure of the station security door is designed based on the knowledge of mechanical design and material mechanics. Where the compensation coil needs to be installed, a suitable groove is created according to the specific size of the coil. A copper foil shielding layer with a thickness of 0.5-1 mm is set on the inner wall of the groove. The shielding layer is fixed to the inner wall of the groove by gluing, and a rubber buffer layer with a thickness of 2 mm is set between the shielding layer and the groove wall. The size design of the groove fully considers the installation convenience and stability of the coil, as well as the impact on the overall performance of the door panel. In high-traffic places such as stations, the security doors are used very frequently. Reasonable groove design can ensure that the coil remains stable during long-term and frequent opening and closing vibrations, and prevent the magnetic field compensation effect from being affected by loose coils, thereby maintaining the stable performance of the security door and ensuring the continuous and effective security work of the station.

[0049] High-quality polyimide insulated sheathed wire is connected to the compensation coil, and the crimping process and connecting terminals are used to ensure the reliability of the connection. The thickness of the insulation layer of the polyimide insulated sheathed wire is 0.3 mm. The coil is fixed in the groove of the door panel with a fixing clamp and a positioning pin. The crimping is performed using a professional crimping device with model XRJ-01. The crimping force of the crimping device is 500N, and the connecting part is heated during the crimping process at 150°C for 30 seconds. The line direction is strictly planned to avoid cross-entanglement and prevent short-circuit safety hazards. The station environment is complex and the security door needs to run uninterruptedly for a long time. Good installation protection measures can effectively avoid equipment failures caused by line problems, improve the reliability and stability of the security door, reduce equipment maintenance time, ensure the efficient operation of the station security work, and provide passengers with a safe and fast travel environment.

[0050] Collect data on the actual operation of the station security gate, such as passenger flow in different time periods, the luggage carried by passengers, and the frequency of false alarms of the security gate. During peak hours in the morning and evening, the passenger flow is large and the luggage carried by passengers is more complicated, so the working pressure of the security gate is relatively high; while in off-peak hours, it is relatively different. Use data analysis algorithms to analyze and process these data, optimize the parameters of the compensation coil, and establish a database. Use CAD to draw the security gate model based on the database, and then use CAM to generate the equipment control program to build an automated production process. The production efficiency and quality of the station security gate can be improved through mechanized production methods. In this way, better-performing security gates can be produced according to the actual needs of the station, the false alarm rate can be reduced, the smooth progress of the station security inspection work can be ensured, and the travel experience of passengers and the safety management level of the station can be improved.

[0051] To sum up, for station security doors, given the special environment of stations with dense passenger flow and numerous metal and electronic equipment, magnetic field detection and positioning accurately identify key control areas, coil planning and preparation are based on the characteristics of station security doors, scientific positioning of compensation coils and optimized winding, door panel groove design takes into account both installation and door panel stability to meet high-frequency usage needs, and the installation and protection links use high-quality materials and standardized processes to ensure long-term and stable operation of the equipment. The production system is constructed based on actual operating data, and algorithms and automation technologies are used to improve the performance and production efficiency of security doors. The overall implementation effectively reduces false alarms and ensures the rapid and safe passage of passengers, greatly enhancing the station's security prevention capabilities and playing a key role in maintaining the station's public safety order.

[0052] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for accurately compensating the magnetic field of a security door and efficiently producing the same, characterized in that: The specific steps of the control method are: S100, magnetic field detection and positioning: The magnetic field distribution around the security door detection coil is analyzed through electromagnetic field simulation software and magnetic field measurement instruments, and the location of the elliptical control area is determined by combining the security door structure, coil layout and space constraints; S200, coil planning and preparation: determine the position of the compensation coil in combination with the position of the elliptical control area, determine the number of turns of the compensation coil according to experimental data, wind the compensation coil by combining multi-layer tight winding with segmented winding, and use the winding density function to represent the winding density along the coil contour; S300, door panel groove design: The door panel structure is designed according to the principles of mechanical design and material mechanics, and grooves for installing the transmitting coil, detection coil and compensation coil are created according to the coil size at the expected location of the coil; S400, coil installation protection: Connect the polyimide insulated sheathed wire to the coil through the crimping process and the connection terminal, fix the coil connected with the sheathed wire in the groove with the fixing clip and the positioning pin, plan the line direction to avoid cross winding, and conduct a comprehensive inspection after the installation is completed; S500, production system construction: analyze and optimize the parameters of compensation coils for security doors of different sizes, build a database, generate automated production programs through CAD / CAM, and use mechanized means to uniformly produce security doors.

2. The method for controlling the precise compensation and efficient production of the magnetic field of a security door according to claim 1 is characterized in that: The specific steps of determining the elliptical control area in the magnetic field detection and positioning in S100 are as follows: (1) Preliminarily set the candidate area with the detection coil as the center; (2) Analyze the magnetic field and eliminate inappropriate spaces based on the magnetic field propagation characteristics, attenuation laws, and spatial constraints; (3) The optimization function F is established by comprehensively considering the optimization of magnetic field uniformity, stability and spatial matching, and the formula is: F = w1·U(B)+w2·S(B)+w3·C(S), where U(B) represents the uniformity index of the magnetic field intensity in the candidate area, S(B) represents the stability index of the magnetic field intensity, C(S) represents the degree of conformity between the candidate area and the spatial restriction conditions, w1, w2 and w3 are weight coefficients, and the candidate area is iteratively adjusted; (4) Determine the elliptical region control area based on the iteration results.

3. The method for controlling the precise compensation and efficient production of the magnetic field of a security door according to claim 2 is characterized in that: In S100, the detection coil in the magnetic field detection positioning is a middle rectangle with semicircles connected at the top and bottom. The size of the middle rectangle of the detection coil is determined, and the width of the rectangle is set to W. rect , the working frequency of the security door is f, and the minimum size of the target detection object is S min , introducing the frequency correction factor γ and the size correction factor δ, the calculation formula is: where f ref is the reference operating frequency; let the length of the rectangle be L rect , the electromagnetic noise interference intensity in the working environment of the security door is E noise , the magnetic field strength of the security door itself is B strength , the interference correction factor is α, the magnetic field strength correction factor is β, and the calculation formula is: Where E ref is the reference electromagnetic noise interference intensity, B std is the standard magnetic field strength, and the distance between the long side of the rectangular part of the detection coil and the center of the detection coil is The distance between the wide side of the rectangular part of the detection coil and the center of the detection coil is The radius of the prototype semicircle at both ends of the detection coil is Assume that the number of detection coils is n, which is determined according to the effective detection area length L of the security door and the expected coverage length l of a single detection coil. The calculation formula is: Where " represents rounding up; let the coordinates of the center position of the detection coil be (x i ,y i ), the center of the bottom of the security door is the coordinate origin (0, 0), the width of the security door is W, and the height is H. For the i-th detection coil (i=1,2,…,n), its center is in the horizontal direction, and the detection coils are evenly distributed in the middle of the width of the security door. The calculation formula is: In the vertical direction, the center distance between adjacent detection coils is d y , then y i =(i-1)d y ,in 4. The method for controlling the precise compensation and efficient production of the magnetic field of a security door according to claim 1 is characterized in that: In the S200, the compensation coil in the coil planning preparation is a middle rectangle connected to semicircles at the top and bottom. The compensation coil generates a compensation magnetic field through a reversely wound coil to offset the current induced in the detection coil by the transmitting coil when no metal passes through, thereby reducing false alarms.

5. The method for controlling the precise compensation and efficient production of the magnetic field of a security door according to claim 1 is characterized in that: In the S200, the compensation coil is positioned in the coil planning preparation. Assuming the center coordinate of the security door is (0, 0), the center of the compensation coil is also at (0, 0), and the calculation formula is: where x c and c They represent the horizontal and vertical coordinates of the compensation coil center in the security door coordinate system, which are used to determine the position of the compensation coil in the plane of the security door. H represents the height of the security door, W is the width of the security door, r is the radius of the detection coil, α0 and β0 are coefficients related to the magnetic field energy distribution, which are obtained through experimental calibration of security door models, materials and environmental factors, and are determined according to the specific models, internal structures, materials used and surrounding environmental factors of different security doors. θ represents the rotation angle of the compensation coil in the magnetic field, and its value range is [0,2π).

6. The method for controlling the precise compensation and efficient production of the magnetic field of a security door according to claim 1 is characterized in that: In the S200, the size of the compensation coil is determined in the coil planning and preparation, and the length of the middle rectangle of the compensation coil is determined. Suppose the length of the middle rectangle of the detection coil is L d , the effective influence range coefficient of the detection coil in the magnetic field is k a , the value range is 0.6-1.0, which is related to the performance of the detection coil itself and the magnetic field environment. The magnetic field inhomogeneity adjustment factor of the security door is m1, which is determined according to the actual measured magnetic field inhomogeneity. The calculation formula for the length L of the middle rectangle of the compensation coil is: L = k a ×L d ×1+m1); Determination of the width of the middle rectangle of the compensation coil, assuming that the width of the middle rectangle of the detection coil is W d , the average width of the expected detection object in the security gate channel is W obj , the magnetic field strength compensation proportional coefficient is k b , the value range is 0.8-1.2, determined according to the ratio between the required compensation magnetic field strength and the existing magnetic field strength, the width W of the rectangle in the middle of the compensation coil r The calculation formula is: The distance between the long side of the compensation coil rectangle and the center of the compensation coil is The distance between the wide side of the compensation coil rectangle and the center of the compensation coil is The radius of the prototype semicircle at both ends of the compensation coil is 7. The method for controlling the precise compensation and efficient production of the magnetic field of a security door according to claim 1 is characterized in that: In the S200, in the coil planning preparation, the winding density function ρ(x) is used to represent the winding density along the coil contour, and the formula is: where k dens is the normalization constant, y ′ is the derivative of the curve function y with respect to x, ω is the phase parameter, which affects the fluctuation frequency of the winding density with the change of position x, φ is the frequency parameter, which is used to adjust the initial phase of the sin function, and e is a specific length parameter on the coil profile.

8. The method for controlling the precise compensation and efficient production of the magnetic field of a security door according to claim 1 is characterized in that: In the S300, in the door panel groove design, a copper foil shielding layer with a thickness of 0.5-1 mm is arranged on the inner wall of the groove, the shielding layer is fixed to the inner wall of the groove by gluing, and a rubber buffer layer with a thickness of 2-3 mm is arranged between the shielding layer and the groove wall.

9. The method for controlling the precise compensation and efficient production of the magnetic field of a security door according to claim 1 is characterized in that: For the S400, the thickness of the insulation layer of the polyimide insulated sheathed wire in the coil installation protection is 0.3-0.5 mm. When connecting the coil and the sheathed wire, a professional crimping device with model XRJ-01 is used for crimping. The crimping force of the crimping device is 500N-800N, and the connecting part is heated during the crimping process. The heating temperature is 150℃-180℃ and the heating time is 30-60 seconds.

Images