A demagnetization module, a bank card demagnetization device and a demagnetization method

Abstract

The application provides a degaussing module, a bank card degaussing device and a degaussing method, the degaussing module comprises: an insulating substrate; a wire layer, on which a plurality of coils are laid in a spiral shape and arranged in sequence along the length direction of a magnetic stripe of a bank card, adjacent coils overlap by a preset length, and the overlapping area adopts a gradually changing line width or cross winding, each coil is connected with an independent H-bridge circuit and supports time-sharing or synchronous control; a magnetic conducting function layer, which is arranged on one side of the wire layer and covers the projection thereof, enhances the magnetic field strength and the uniformity of distribution; a heat dissipation layer, which is connected with the magnetic conducting function layer through a heat conducting medium; a plurality of magnetic sensors, which are arranged at intervals in the non-conductive area of the wire layer and electrically connected with a controller, detect the magnetic field of the degaussing area in real time and feedback to dynamically adjust the degaussing parameters of the coil; the application improves the degaussing uniformity, heat dissipation efficiency and degaussing reliability, and is suitable for safe and efficient destruction of the data of the magnetic stripe of the bank card.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bank card demagnetization, in particular to a demagnetization module, a bank card demagnetization device and a demagnetization method. BACKGROUND

[0002] The magnetic stripe in the bank card stores sensitive data such as user account information and transaction records. In the process of bank card scrapping, replacement or recycling, if the magnetic stripe data is not completely eliminated, there will be a risk of information leakage and illegal reuse. Therefore, efficient and reliable demagnetization of the bank card is an important link to protect financial information security.

[0003] At present, the existing technology mainly adopts electromagnetic demagnetization to clear the data of the bank card magnetic stripe. The core principle is to make the magnetic domains on the magnetic stripe directional disturbance through an alternating magnetic field, so as to achieve the elimination of data that cannot be recovered. However, the existing bank card demagnetization technology still has the following outstanding problems in the implementation process:

[0004] 1. Uneven magnetic field coverage: The traditional single coil demagnetization scheme is prone to form blind areas on the magnetic stripe due to discontinuous magnetic field distribution, resulting in data residue risk. The residual rate of magnetic stripe data is greater than or equal to 5% (actual measurement data). Although some existing patents mention multi-coil demagnetization, they do not disclose the optimization design of magnetic field coupling in the overlapping area and the closed-loop feedback mechanism, which makes it impossible to realize dynamic parameter adjustment.

[0005] 2. Heat management defects: When high-power demagnetization is used, the coil temperature rises too quickly, and traditional heat dissipation designs (such as single aluminum plate heat dissipation) are prone to cause the magnetic permeability of the ferrite core to decrease, affecting the stability of the magnetic field strength.

[0006] 3. Lack of detection mechanism, low demagnetization reliability: Most existing demagnetization equipment is open-loop control, that is, after setting fixed parameters, the demagnetization operation is performed, and the actual demagnetization effect is not detected and fed back in real time. More importantly, the existing scheme lacks the ability to judge the local demagnetization effect, and cannot identify the specific location of data residue, so it cannot trigger targeted secondary local demagnetization, further affecting the reliability and safety of demagnetization.

[0007] Therefore, there is an urgent need for a demagnetization module, a bank card demagnetization device and a demagnetization method that can improve the uniformity of demagnetization, heat dissipation efficiency and demagnetization reliability. SUMMARY

[0008] The purpose of the present application is to provide a demagnetization module, a bank card demagnetization device and a demagnetization method, which aims to solve the obvious deficiencies of traditional demagnetization equipment in uniformity, heat management and effect detection of bank card demagnetization, and to meet the high standard requirements of the financial industry for data security destruction.

[0009] To achieve the above object, in a first aspect, the application provides a degaussing module, comprising:

[0010] an insulating substrate;

[0011] a wire layer, comprising a plurality of coil segments, the wire of each coil segment being laid on the insulating substrate in a spiral form; the coil segments are arranged along the length direction of a bank card magnetic stripe in sequence, and the adjacent coil segments overlap each other by a preset length, and the overlapping area adopts a gradually changing wire width or cross winding; each coil segment is connected to an independent H-bridge circuit to support time-sharing or synchronous control;

[0012] a magnetic conducting functional layer, arranged on the side of the wire layer away from the insulating substrate and covering the projection area of the wire layer, for enhancing the magnetic field strength generated by the wire layer and optimizing the distribution uniformity thereof;

[0013] a heat dissipation layer, connected to the magnetic conducting functional layer through a heat conducting medium;

[0014] a plurality of magnetic sensors, arranged at intervals in the non-conductive area of the wire layer and electrically connected to the controller, for detecting the magnetic field signal of the degaussing area in real time and feeding back to the controller to dynamically adjust the degaussing parameters of each coil segment.

[0015] As a further improvement of the above scheme, a plurality of heat conducting grooves are formed on the non-working plane of the magnetic conducting functional layer, and the heat conducting grooves are filled with a heat conducting metal grid, preferably, the heat conducting metal grid is a copper mesh.

[0016] As a further improvement of the above scheme, the heat dissipation layer is attached to the non-working plane of the magnetic conducting functional layer through a phase change heat conducting pad;

[0017] and the heat dissipation layer is provided with a metal heat dissipation plate and a plurality of heat dissipation fins arranged on the side of the metal heat dissipation plate away from the phase change heat conducting pad.

[0018] As a further improvement of the above scheme, an alumina insulating layer is arranged between the heat conducting metal grid and the magnetic conducting functional layer, and the surface of the heat conducting metal grid is flush with the non-working plane of the magnetic conducting functional layer; the thickness of the phase change heat conducting pad after compression is hmm (preferably h is 0.15 mm), which can fully cover the projection area of the heat conducting metal grid.

[0019] As a further improvement of the above scheme, the wire layer and the magnetic conducting functional layer are bonded through a heat conducting adhesive, and the heat conducting adhesive layer is provided with a glue reduction groove in the non-overlapping area;

[0020] and when the overlapping area adopts a gradually changing wire width, the wire width gradually changes from a mm (preferably a is 0.3 mm) to b mm (preferably b is 0.5 mm), and a is smaller than b, so as to enhance the magnetic field coupling between the adjacent coil segments.

[0021] As a further improvement of the above-mentioned solution, several of the magnetic sensors are arranged, at least one of which is arranged at the end of the first coil (with reference to the card insertion direction of the bank card), one of which is arranged at the middle of the middle coil, and one of which is arranged at the beginning of the end coil.

[0022] Each of the magnetic sensors is greater than c from the edge of the nearest coil, preferably c = 2mm; and a back of each of the magnetic sensors is attached with a permalloy shielding sheet; preferably, the magnetic sensor is a Hall sensor.

[0023] As a further improvement of the above-mentioned solution, the magnetic conducting function layer is a ferrite core, and the ferrite core is a plate-shaped body.

[0024] In a second aspect, the present application also provides a bank card demagnetization device, comprising:

[0025] A rack;

[0026] A card conveying channel arranged in the rack for the bank card to be demagnetized to pass through;

[0027] An upper card conveying assembly arranged above the card conveying channel for driving the bank card to move along the card conveying channel;

[0028] A lower card conveying assembly arranged below the card conveying channel, comprising a lower support frame and a demagnetization module arranged on one side of the lower support frame; the demagnetization module is the demagnetization module provided in the first aspect;

[0029] A controller arranged outside the rack for controlling the demagnetization module to work and receiving feedback signals.

[0030] As a further improvement of the above-mentioned solution, the upper card conveying assembly comprises:

[0031] Two driven rubber rollers arranged in parallel and spaced apart directly above the card conveying channel for providing power for the bank card to be demagnetized to enter and exit the card;

[0032] A position sensor group comprising at least one position sensor arranged at the first end of one inner side of the rack, at least one position sensor arranged at the middle of the other inner side of the rack, and at least one position sensor arranged at the end of one inner side of the rack for real-time detection of the position of the bank card in the card conveying channel.

[0033] As a further improvement of the above-mentioned solution, the lower card conveying assembly further comprises two driven conveying rollers, and the two driven conveying rollers are arranged in correspondence with the two driven rubber rollers above and below, respectively.

[0034] The driven conveying roller comprises a driven axle, a driven rubber roller rotatably arranged in the middle of the driven axle, and two elastic members respectively abutting against two ends of the driven axle and elastically stretching and contracting the driven axle along a direction perpendicular to an axial direction of the driven axle, so as to ensure that the lower surface of the bank card is in contact with the driven rubber roller. In a third aspect, the application also provides a demagnetization method of the bank card demagnetization device provided in the second aspect, and the steps of the method comprise:

[0035] S1, the bank card enters the card conveying channel and moves in a preset moving direction under the action of the upper card conveying assembly; meanwhile, the first coil, the middle coil, the synchronization of the first coil and the middle coil, and the last coil in the multiple coils in the demagnetization module are activated in sequence according to a preset time sequence, and the activation time of each coil is tms (preferably, t is 5 ms), so that the bank card is demagnetized by differentially generating a demagnetization magnetic field in different regions;

[0036] S2, in the process of moving demagnetization of the bank card, the magnetic field signals of the demagnetization region are collected in real time by a plurality of magnetic sensors arranged in the demagnetization module, and the collected magnetic field signals are fed back to the controller for filtering processing and compared with a preset dynamic threshold value to determine whether the current demagnetization effect meets the standard.

[0037] When the output signals of ≥2 magnetic sensors exceed the dynamic threshold value, it is determined that the demagnetization of the corresponding region is insufficient, and the controller triggers the corresponding coil to perform a secondary demagnetization operation to enhance the magnetic field effect of the region and reduce the risk of magnetic stripe data residue.

[0038] Due to the above technical solutions, the application has the following beneficial effects:

[0039] 1. The application provides a demagnetization device, which significantly improves the uniformity of the demagnetization magnetic field distribution through the layout of multiple coils and the design of overlapping gradual change / cross winding, specifically, the wire layer comprises multiple coils, each coil is laid in a spiral form on an insulating substrate, and is arranged in sequence along the length direction of the magnetic stripe of the bank card and overlaps with the adjacent coil by a preset length, the overlapping area is processed in a gradual change wire width or cross winding manner, so as to ensure that the magnetic field coverage areas of adjacent coils seamlessly connect during the movement of the bank card. Such a setting can effectively eliminate the magnetic field boundary effect and strength mutation problem caused by the traditional single coil or simple splicing of segments, so that the magnetic field transition between adjacent coils is more smooth and continuous, thereby forming a uniformly superimposed demagnetization magnetic field in the entire length direction of the magnetic stripe, greatly improving the spatial uniformity of the demagnetization effect and avoiding the problems of magnetic stripe information residue or incomplete demagnetization caused by insufficient local magnetic field.

[0040] The present application effectively converges and guides the magnetic field generated by the coil by arranging a magnetic conducting function layer above the wire layer and covering the overall projection area of the wire layer, suppresses the magnetic field diffusion and magnetic leakage phenomenon, enhances the magnetic field strength acting on the magnetic stripe area of the bank card, optimizes the spatial distribution form of the magnetic field, makes the magnetic force lines more concentrated and uniformly act on the magnetic stripe of the bank card, reduces the edge effect and invalid magnetic field area, and further improves the consistency of the demagnetization energy utilization efficiency and demagnetization effect, so as to ensure that each bank card can meet the reliable demagnetization standard.

[0041] In addition, each coil in the demagnetization device provided by the present application is connected to an independent H-bridge circuit, so that each coil can not only be driven individually, but also can be activated or excited synchronously according to the control strategy. Such a setting gives the system higher control freedom, and can dynamically adjust the current size, direction and action time of each coil according to the bank card magnetic stripe material, card speed, magnetic field response characteristics and other factors, so as to accurately match the needs of different demagnetization scenes, further improve the controllability and adaptability of the demagnetization process, and ensure that all types of bank card magnetic stripes can be efficiently and stably demagnetized.

[0042] The present application also specially provides a heat dissipation layer connected to the magnetic conducting function layer through a heat conducting medium, which can timely conduct and dissipate the heat generated by the coil and the magnetic conducting material during high-intensity work, avoiding problems such as magnetic performance decay, component aging or control system failure caused by local overheating. Such a heat management design significantly improves the thermal stability and reliability of the demagnetization module under long-time and high-frequency working conditions, prolongs the service life of the equipment, and ensures the consistency and safety of the demagnetization process.

[0043] The present application arranges multiple magnetic sensors in the non-conductive intervals of the wire layer and electrically connects them to the controller, so that the present application can detect the magnetic field strength and distribution state in the demagnetization area in real time, and feed back the collected signals to the control unit for dynamically adjusting the demagnetization parameters (such as current, frequency, action time, etc.) of each coil. This closed-loop control mechanism makes the demagnetization process no longer rely on fixed parameters, but can make real-time adjustments according to the actual magnetic field response, ensuring accurate and effective demagnetization effect under different working conditions, while providing a reliable data basis for monitoring and tracing the demagnetization quality. The organic integration and synergistic effect of multiple technical features such as multiple coils, overlapping gradual / interleaved winding design of multiple coils, independent H-bridge driving, magnetic conducting function layer optimization, heat dissipation structure cooperation and magnetic sensor feedback control, not only breaks through the technical bottlenecks of traditional demagnetization equipment in magnetic field uniformity, heat management capability, effect monitoring and self-adaptive adjustment, but also realizes high precision, high reliability and high safety of the demagnetization process, fully meets the stringent requirements of the financial industry for bank card data security destruction, and has significant technical progress and practical value.

[0044] 2. The application also provides a bank card demagnetization device, which is stable in operation, accurate in control, safe and efficient, and is constructed through integration of a modular high-performance demagnetization module, a card conveying driving structure in cooperation from top to bottom, a compact and reasonable rack channel layout, and centralized management of an external intelligent controller. The high-performance demagnetization module is integrated below the card conveying channel, so that the entire device can apply a uniform, controllable and high-strength demagnetization magnetic field at the optimal action position close to the magnetic stripe while realizing stable transmission of the card, thereby guaranteeing the efficiency and thoroughness of demagnetization processing from the source and effectively preventing the risk of magnetic stripe information residue and data leakage. The bank card demagnetization device is also provided with an upper card conveying assembly and a lower card conveying assembly, which are arranged above and below the card conveying channel respectively and jointly act on the bank card to realize stable, continuous and controllable conveying of the bank card. This double-end driving structure not only improves the stability and anti-deviation ability during card conveying, but also ensures the accurate position and stable posture of the bank card when passing through the demagnetization area, so that the magnetic stripe is always within the optimal action range of the demagnetization module. The application not only effectively overcomes the technical shortcomings of traditional equipment in card conveying, magnetic field action, heat management and effect feedback, but also realizes high automation, uniformity and traceability of the demagnetization process, and significantly improves the security level and processing efficiency of financial data destruction.

[0045] 3、The application also provides a bank card demagnetization method with precise control, adaptive adjustment, safety and reliability, which effectively solves the technical defects of the traditional demagnetization method in the aspects of insufficient uniformity of magnetic field effect, uncontrollable demagnetization process, lack of effect monitoring and compensation mechanism, and significantly improves the completeness, consistency and intelligent level of bank card magnetic stripe information destruction, better meeting the high standard requirements of the financial industry for data security clearance. Specifically, in step S1, the multi-segment coils in the demagnetization module are activated in a specific time sequence: including the first coil, the middle coil, the first and middle coil synchronous activation, and the last coil, and the activation time of each coil is controlled within 5ms. Through the time-sharing or synchronous control of different area coils, the targeted magnetic field effect on different positions of the bank card magnetic stripe is realized. This regional activation strategy can accurately match the magnetic field strength and action time according to the actual position and response characteristics of each part of the magnetic stripe, avoiding the local demagnetization deficiency or overkill caused by single or overall magnetic field effect in the traditional method, thereby forming a uniform, continuous and efficient demagnetization magnetic field distribution in the full length of the magnetic stripe, significantly improving the spatial consistency of demagnetization effect; in step S2, multiple magnetic sensors are arranged in the demagnetization module to collect the magnetic field signals in the demagnetization area in real time and transmit them to the controller for filtering processing and dynamic threshold comparison. With such a setting, online monitoring of the magnetic field strength and distribution state during the demagnetization process is realized, enabling the system to real-time perceive the actual magnetic field response of the demagnetization area, providing objective and quantitative data basis for judging whether the demagnetization effect meets the standard, overcoming the problem of blind operation and inability to confirm the demagnetization quality in the traditional demagnetization method, and significantly improving the controllability and traceability of the demagnetization process. When insufficient demagnetization in a certain area is detected, the controller is further triggered to perform secondary demagnetization operation on the coil corresponding to the area, thereby enhancing the magnetic field effect time or strength of the local area to ensure that the residual information on the magnetic stripe is further completely eliminated. This adaptive feedback and compensation mechanism forms a closed-loop control of the demagnetization process, significantly reducing the risk of magnetic stripe data residue and information leakage caused by incomplete primary demagnetization, and comprehensively improving the final reliability of data security destruction. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor based on the drawings shown.

[0047] Figure 1A perspective view of a bank card demagnetization device according to the present application;

[0048] Figure 2 A top view of a bank card demagnetization device according to the present application;

[0049] Figure 3 A left view of a bank card demagnetization device according to the present application;

[0050] Figure 4 A top view of a lower card feeding assembly according to the present application;

[0051] Figure 5 A cross-sectional view of A-A of Figure 4

[0052] Figure 6 A perspective view of a lower card feeding assembly (with one pressing plate removed) according to the present application;

[0053] Figure 7 A top view of a demagnetization module according to the present application;

[0054] Figure 8 A cross-sectional view of B-B of Figure 7

[0055] Figure 9 A top view of the relative positions of an insulating substrate, a wire layer and magnetic sensors of a demagnetization module according to the present application;

[0056] Figure 10 A cross-sectional view of C-C of Figure 9

[0057] Figure 11 A top view of the relative positions of coils and magnetic sensors of a demagnetization module according to the present application and a bank card;

[0058] Figure 12 A cross-sectional view of D-D of Figure 11

[0059] Figure 13 A time sequence diagram of time division driving of multi-segment coils of a demagnetization module according to the present application, wherein the horizontal axis represents time in ms and the vertical axis represents current in A.

[0060] Reference signs:

[0061] ​​​​0, demagnetization module; 1, insulating substrate; 2, wire layer; 21, first coil; 22, middle coil; 23, last coil; 3, magnetic conductive function layer; 31, heat conduction groove; 32, heat conduction metal grid; 4, heat dissipation layer; 41, metal heat dissipation plate; 42, heat dissipation fin; 5, magnetic sensor; 6, phase change heat conduction pad; 7, heat conduction glue; 01, rack; 02, card conveying channel; 03, upper card conveying assembly; 031, driving rubber roller; 032, position sensor; 04, lower card conveying assembly; 041, lower support frame; 042, driven shaft; 043, driven rubber roller; 044, elastic member; 045, pressing plate; 05, controller; 06, bank card; E, overlapping area.

[0062] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0063] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0064] It should be noted that all directional indications (such as up, down, …) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0065] In addition, the description such as “first”, “second” and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as “first”, “second” can explicitly or implicitly include at least one of the features.

[0066] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of a person of ordinary skill in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope of the present application.

[0067] Example 1

[0068] Reference Figures 7-12The application provides a demagnetization module 0 for bank card demagnetization, through the synergistic effect of key technologies such as multi-section coil structure, independent H-bridge driving, magnetic guide function layer 3 optimization, heat dissipation structure cooperation and magnetic sensing feedback control, uniform, efficient and controllable magnetic field demagnetization effect on the magnetic stripe area of the bank card 06 is realized, the magnetic stripe data is completely and safely destroyed, and the high standard requirement of the financial industry on data security is met.

[0069] The demagnetization module 0 comprises:

[0070] An insulating substrate 1, which is a bearing base of the wire layer 2, mainly plays the roles of electrical insulation and mechanical support; the insulating substrate 1 can adopt a conventional printed circuit board (PCB) substrate, such as FR-4, a ceramic substrate or a high polymer insulating material. The shape and size of the insulating substrate 1 can be adapted according to the actual installation space of the demagnetization module 0, the bank card 06 card path and the magnetic stripe position, and it is usually a rectangular sheet shape, on which the subsequent wire layer 2 structure is laid flat.

[0071] A wire layer 2, which is provided with a plurality of coil sections, and each coil section is arranged and connected in a specific manner; specifically, the wire layer 2 is arranged on the insulating substrate 1 and is a key functional part for generating a demagnetization magnetic field in the demagnetization module 0. The wire layer 2 comprises a plurality of coil sections, and the wires of each coil section are laid flat on the insulating substrate 1 in a spiral form (for example, a circular, elliptical or rectangular spiral), that is, each coil section itself is in a planar spiral shape, for generating a magnetic field around the direction of the magnetic stripe when energized;

[0072] The plurality of coil sections are arranged in sequence along the length direction of the magnetic stripe of the bank card 06, that is, along the insertion direction of the bank card 06, the spatial trend of the magnetic stripe from the beginning to the end, and a plurality of coil sections are arranged in sequence to ensure that each part of the magnetic stripe can be effectively affected by the magnetic field; in this embodiment, referring to Figure 9 Three coil sections are arranged along the length direction of the magnetic stripe of the bank card 06, which are the first coil section 21, the middle coil section 22 and the last coil section 23, and the number of coil sections can be flexibly adjusted according to the length of the bank card 06, and the magnetic stripe of the bank card 06 can be covered as a reference;

[0073] The adjacent coil sections overlap each other by a preset length (for example, 2-8 mm, which is set according to the specific situation, and in this embodiment, the overlapping area E is 5 mm), and the overlapping area E is used to realize the smooth transition of the magnetic field between the coil sections, avoid the sudden change or discontinuity of the magnetic field strength caused by the coil boundary, and thus improve the uniformity of the overall magnetic field distribution.

[0074] Further, in the overlapping area E field, the wire adopts the design of gradually changing line width or cross winding. The gradually changing line width is that the width of the guide wire in the overlapping area E gradually changes (from wide to narrow or from narrow to wide) to adjust the current density and magnetic field strength of the area to achieve a soft transition; the cross winding further disperses the magnetic field boundary effect by changing the wire direction, both of which can effectively optimize the magnetic field coupling between adjacent coils and improve the uniformity and continuity of the demagnetization effect.

[0075] Each section of the coil is connected to an independent H-bridge circuit. The H-bridge circuit is an electronic driving circuit that can flexibly control the direction and size of the current. By independently controlling the energization direction, current intensity, and action time of each section of the coil, it supports the time-sharing activation or synchronous excitation of the coil, so that the demagnetization parameters of each section of the coil can be accurately adjusted according to the actual working conditions such as the material of the magnetic strip, the card speed, and the magnetic field response, and the fine control and adaptive adjustment of the demagnetization process can be realized.

[0076] The magnetically conductive functional layer 3 is used to enhance and optimize the magnetic field. The magnetically conductive functional layer 3 is arranged on the side of the wire layer 2 away from the insulating substrate 1. The magnetically conductive functional layer 3 is usually made of high-permeability material and is used to concentrate and enhance the magnetic field generated by the coil, thereby increasing the effective magnetic field strength acting on the magnetic strip. It is used to optimize the spatial distribution of the magnetic field, so that the magnetic lines are more concentrated and uniformly distributed in the area where the magnetic strip is located, reducing the magnetic leakage and edge effect. At the same time, the magnetically conductive functional layer 3 also has a certain magnetic field guiding effect, ensuring that most of the magnetic flux acts on the magnetic strip, improving the utilization efficiency of demagnetization energy and the reliability of demagnetization effect. The magnetically conductive functional layer 3 covers the entire projection area of the wire layer 2, i.e. corresponds to all coils in space, to ensure the comprehensiveness and consistency of the magnetic field enhancement.

[0077] The heat dissipation layer 4 is used for module thermal management. Since multiple sections of the coil will generate heat under high-frequency or continuous working conditions, in order to avoid heat accumulation leading to magnetic performance degradation, component aging or control failure, the present application provides a heat dissipation layer 4 which is effectively thermally connected to the magnetically conductive functional layer 3 through a heat-conducting medium (such as heat-conducting silicone, heat-conducting gasket, metal heat-conducting column or heat-conducting paste, etc.). The heat dissipation layer 4 can be a metal heat sink 41, a heat dissipation fin 42 structure or a heat-conducting path connected to the whole machine heat dissipation system. Its function is to quickly conduct and dissipate the heat generated by the magnetically conductive layer and the coil to the environment, maintain the thermal stability and reliability of the module under long-time and high-load working conditions, prolong the service life, and ensure the consistency and safety of the demagnetization process.

[0078] A plurality of magnetic sensors 5 are used to monitor the demagnetization magnetic field in real time and feedback control; in order to realize real-time sensing and dynamic adjustment of the effect of the demagnetization process, a plurality of magnetic sensors 5 (such as Hall sensors, magnetic resistance sensors, etc.) are arranged at intervals in the non-conductive area of the wire layer 2, i.e. the area where no wires are arranged to avoid signal interference, these sensors are electrically connected with the controller 05 (not shown in the figure, usually located in the device main control system).

[0079] The magnetic sensor 5 is used to collect the magnetic field strength signal in the demagnetization area in real time, and transmit the collected original signal to the controller 05. The controller 05 first filters the signal, and then compares it with a preset dynamic threshold value to determine whether the magnetic field strength of the current demagnetization area meets the effective demagnetization standard; if it is detected that the demagnetization is not effective, the controller 05 triggers a secondary demagnetization operation on the corresponding coil to further strengthen the magnetic field effect, thereby reducing the risk of magnetic stripe data residue and ensuring that the demagnetization effect is reliable and up to standard. This feedback control mechanism forms a closed-loop regulation of the demagnetization process, so that the demagnetization operation is no longer dependent on fixed parameters, but can be adaptively optimized according to the actual magnetic field response, significantly improving the intelligent level and safety guarantee capability of demagnetization.

[0080] The organic integration and synergistic effect of multiple technical features such as multi-section coil, overlapping and gradual change / cross winding design of multi-section coil, independent H-bridge driving, optimization of magnetic function layer 3, heat dissipation structure cooperation and magnetic sensing feedback control not only break through the technical bottlenecks of traditional demagnetization equipment in terms of magnetic field uniformity, heat management capability, effect monitoring and adaptive adjustment, but also realize high precision, high reliability and high safety of the demagnetization process, fully meet the stringent requirements of the financial industry for bank card 06 data security destruction, and have significant technical progress and practical popularization value.

[0081] As a preferred embodiment, in order to further improve the heat conduction efficiency and overall heat dissipation performance of the demagnetization module 0 under long-time and high-load working conditions, a plurality of heat conduction grooves 31 are opened on the non-working plane of the magnetic function layer 3, and a heat-conducting metal grid 32 is filled in the heat conduction grooves 31, preferably the heat-conducting metal grid 32 is a copper mesh. In this way, without significantly increasing the overall thickness and complexity of the demagnetization module 0, the heat connection efficiency and heat diffusion capacity between the magnetic function layer 3 and the heat dissipation layer 4 are significantly improved, which plays an important role in ensuring the stable operation of the demagnetization module 0 and prolonging the service life.

[0082] In this embodiment, the non-working plane of the magnetic function layer 3 refers to the side of the function layer that does not directly face the magnetic stripe of the bank card 06 and does not directly participate in the magnetic field action, i.e. the side opposite to the wire layer 2, usually set back to the demagnetization area. This side is mainly used to connect with the heat dissipation structure and is the key interface for heat conduction and heat dissipation.

[0083] The depth, width and number of the heat-conducting grooves 31 can be optimized according to the material thickness, overall size, expected heat generation and heat dissipation design requirements of the magnetic-conducting functional layer 3. In the embodiment, the heat-conducting grooves 31 are preferably cuboid grooves with a certain depth, and the width of the heat-conducting grooves 31 is 0.5 mm and the depth is 2 mm. Generally, the groove spacing is set reasonably according to the overall layout to ensure the overall continuity and uniformity of the heat-conducting network.

[0084] In the heat-conducting grooves 31, a heat-conducting metal grid 32 is filled, which has good heat conductivity, ductility, processability and electrical conductivity. The arrangement of the heat-conducting metal grid 32 further enhances the heat conduction capacity of the heat-conducting groove 31 region. Through the high thermal conductivity of metal (especially the thermal conductivity of copper is as high as about 400 W / (m·K)), the heat accumulated in the magnetic-conducting functional layer 3 is rapidly conducted into the groove, and the heat diffusion area is expanded through the grid structure, thereby improving the contact thermal resistance between the heat-conducting groove 31 and the heat dissipation layer 4 and the heat exchange efficiency. Preferably, the heat-conducting metal grid 32 is a copper mesh, which not only has extremely high heat conductivity, but also has excellent processability, moderate flexibility and cost-effectiveness, and is very suitable for use as a filling material in the heat-conducting grooves 31.

[0085] As a preferred embodiment, in order to further improve the heat dissipation efficiency, heat conduction uniformity and overall thermal stability of the demagnetization module 0 in a long-time and high-load working state, the heat dissipation layer 4 is optimized and designed in the present application. The heat dissipation layer 4 is tightly attached to the non-working plane of the magnetic-conducting functional layer 3 through a phase-change heat-conducting pad 6. In addition, the heat dissipation layer 4 includes a metal heat dissipation plate 41 and a plurality of heat dissipation fins 42 arranged on the side of the metal heat dissipation plate 41 away from the phase-change heat-conducting pad 6. This structure builds an efficient heat conduction and dissipation path from the magnetic-conducting functional layer 3 to the environment space through the multiple designs of high-efficiency heat-conducting interface, high-thermal-capacity heat dissipation substrate and high-efficiency radiation expansion structure, thereby significantly improving the heat dissipation performance and operation reliability of the module.

[0086] In the embodiment, the heat dissipation layer 4 is not directly mechanically compressed or simply attached to the magnetic-conducting functional layer 3, but is tightly attached to the non-working plane of the magnetic-conducting functional layer 3 through a phase-change heat-conducting pad 6.

[0087] The phase-change heat-conducting pad 6 is a high-performance heat-conducting interface material that undergoes a phase change (such as from solid to soft viscoelastic state) within a certain temperature range, has high thermal conductivity and excellent compression resilience, can maintain good contact under the attachment pressure during module assembly, and will not exert excessive stress on the magnetic-conducting functional layer 3 or other functional components.

[0088] On the side of the phase-change heat-conducting pad 6 away from the magnetically conductive functional layer 3, the application further provides a metal heat-dissipating plate 41 as the core heat-diffusing and bearing component in the heat-dissipating layer 4. The metal heat-dissipating plate 41 preferably adopts a metal material with high heat-conducting coefficient, such as aluminum alloy or copper; on the side of the metal heat-dissipating plate 41 away from the phase-change heat-conducting pad 6, i.e. the side away from the magnetically conductive functional layer 3, the application further provides a plurality of heat-dissipating fins 42; these heat-dissipating fins 42 are usually integrally formed of the same metal material as the metal heat-dissipating plate 41, and can have the form of parallel straight fins, corrugated fins, staggered arrangement or a structure optimized according to the airflow direction, with the purpose of increasing the heat-dissipating surface area and improving the heat exchange efficiency with the surrounding environment.

[0089] As a preferred embodiment, to improve the heat-dissipating efficiency while ensuring electrical insulation safety, optimizing the heat-conducting interface, improving the structural integration and the reliability of the assembly, and preventing the risk of electrical short circuit between the heat-conducting metal mesh 32 and the magnetically conductive functional layer 3, especially in the scenario where the magnetically conductive functional layer 3 has a certain electrical conductivity or there is induced electric charge, the application further provides an aluminum oxide insulating layer between the heat-conducting metal mesh 32 and the magnetically conductive functional layer 3. After filling the heat-conducting metal mesh 32 in the heat-conducting groove 31, the application further controls the filling height of the heat-conducting metal mesh 32, performs surface leveling treatment or selects a mesh material with an appropriate thickness, so that the surface of the heat-conducting metal mesh 32 is flush with the non-working plane of the magnetically conductive functional layer 3.

[0090] The heat-dissipating layer 4 is assembled with the non-working plane of the magnetically conductive functional layer 3 through a layer of phase-change heat-conducting pad 6. The phase-change heat-conducting pad 6 not only bears the function of heat-conducting interface, but also plays a certain role in stress buffering, interface filling and structural protection. Preferably, the application precisely controls the thickness of the phase-change heat-conducting pad 6 after compression, which is preferably about h=0.15mm; the precise control of the thickness not only ensures sufficient compressibility, so that the phase-change heat-conducting pad 6 can fully fill the micro gaps between the heat-conducting metal mesh 32 and the heat-dissipating layer 4 during assembly and compression, eliminate air resistance and form a continuous heat-conducting path with low thermal resistance; but also does not excessively thicken, avoiding the increase of thermal resistance, the increase of overall thickness of the structure or the interference with the surrounding components. The application requires that the phase-change heat-conducting pad 6 should fully cover the projection area of the heat-conducting metal mesh 32 after compression, i.e. the coverage of the heat-conducting pad should at least include all the heat-conducting grooves 31 and the orthographic projection range of the metal mesh on the non-working plane.

[0091] As a preferred embodiment, in order to improve the adhesion reliability of the internal structure of the module, the heat conduction efficiency and the magnetic field coupling performance between adjacent coils, in the present application, the wire layer 2 and the upper magnetic conducting functional layer 3 are not in direct physical contact or mechanically pressed together, but are bonded and fixed through a layer of heat conducting glue 7 to realize the functions of bonding and heat conduction. The layer of heat conducting glue 7 not only plays the role of firmly bonding the wire layer 2 and the magnetic conducting functional layer 3, but also has excellent heat conduction performance, which can conduct part of the heat generated during the operation of the coil from the wire layer 2 to the magnetic conducting functional layer 3, and then dissipate it outward through the subsequent heat dissipation structure, thereby assisting the overall thermal management.

[0092] In order to further improve the adhesion reliability, material utilization rate and heat conduction uniformity of the layer of heat conducting glue 7, the present application provides a glue reduction groove in the layer of heat conducting glue 7, corresponding to the non-overlapping area E domain between adjacent coils on the wire layer 2, to control the coating amount and distribution area of the heat conducting glue 7, avoid excessive glue overflow in the non-overlapping area E, and thereby reduce the problem of uneven glue layer thickness, material waste or possible local thermal resistance increase.

[0093] In the demagnetization module 0 of the present application, the multi-section coils are arranged along the length direction of the bank card 06 magnetic stripe, in order to ensure that each area of the magnetic stripe can be subjected to uniform and continuous demagnetization magnetic field, a preset length of overlapping area E domain is provided between adjacent coils to avoid the magnetic field strength mutation or discontinuity caused by the boundary effect between traditional segmented coils.

[0094] On this basis, the present application further optimizes the design of the wire structure in the overlapping area E domain: when the overlapping area E domain adopts a gradually changing wire width, the wire width gradually changes from a mm (preferably 0.3 mm) to b mm (preferably 0.5 mm), and satisfies a < b, i.e. the wire width gradually changes from narrow to wide. The wire width gradually changing structure helps to expand the overlapping range of the magnetic field action, improve the overall strength and uniformity of the magnetic field at the corresponding position of the magnetic stripe, thereby enhancing the magnetic field coupling performance between adjacent coils, ensuring that the magnetic stripe is subjected to more balanced and effective magnetic field when passing through the demagnetization area, and improving the spatial consistency and reliability of the demagnetization effect.

[0095] As a preferred embodiment, in order to real-time perceive the magnetic field strength and distribution state in the demagnetization area, and dynamically feedback and adjust the demagnetization process accordingly, a plurality of magnetic sensors 5 are arranged at intervals on the non-conductive area of the wire layer 2, which are electrically connected with the controller 05, used for collecting the magnetic field signal of the demagnetization area and feeding back to the control unit, to realize the dynamic adjustment and precise control of the demagnetization parameters of each section coil.

[0096] In order to comprehensively monitor the magnetic field state of different coil action areas in the demagnetization process, the present application arranges a plurality of magnetic sensors 5 at key positions of the multi-section coils, specifically including:

[0097] At least one magnetic sensor 5 is arranged at the end of the first-stage coil 21 (with reference to the card insertion direction of the bank card 06): this position corresponds to the area where the magnetic stripe just enters the demagnetization area and the first-stage coil 21 starts to work, and is used to detect the initial magnetic field strength in real time to provide a reference signal for subsequent control;

[0098] At least one magnetic sensor 5 is arranged at the middle of the middle-stage coil 22: this position is in the middle stage of the demagnetization process and corresponds to the area where the magnetic stripe is subjected to the main magnetic field, and can effectively reflect the core action strength and uniformity of the demagnetization magnetic field, and is one of the core monitoring points for judging whether the overall demagnetization effect meets the standard.

[0099] At least one magnetic sensor 5 is arranged at the start of the last-stage coil 23: this position corresponds to the area where the magnetic stripe is about to leave the main demagnetization area and the last-stage coil 23 starts or synchronously works, and is used to monitor the magnetic field state at the end of the demagnetization process to ensure that the tail area of the magnetic stripe is also fully demagnetized.

[0100] This differential arrangement in different areas enables the present application to perform multi-point, real-time and accurate monitoring on the magnetic stripe of the bank card 06 in the full-path and multi-stage magnetic field response through the demagnetization channel, and provides comprehensive and reliable signal basis for subsequent dynamic feedback control and secondary demagnetization decision.

[0101] In order to avoid the magnetic sensor 5 from being affected by electromagnetic interference, magnetic saturation or direct coupling due to being too close to the coil wire, resulting in distortion or increased error of the detection signal, the present application further limits that a certain safety distance is maintained between each magnetic sensor 5 and the nearest coil edge, and the distance is not less than c, and the preferred value is c=2mm. By setting the distance between the sensor and the coil edge to be ≥2mm (preferred value), the present application realizes the organic unification of the accuracy of magnetic field detection, the reliability of signal output and the rationality of structural arrangement.

[0102] In order to further enhance the anti-electromagnetic interference capability, signal stability and measurement accuracy of the magnetic sensor 5 in the actual working environment, a permalloy shielding sheet is attached to the back of each magnetic sensor 5. Permalloy is a soft magnetic material with high magnetic permeability, low coercivity and excellent magnetic shielding performance, which can effectively guide and absorb external stray magnetic fields and prevent them from entering the sensor sensitive area.

[0103] In the present application, the magnetic sensor 5 preferably adopts a Hall sensor, which is a magnetic sensitive element based on the Hall effect and has the advantages of small size, fast response, high sensitivity, easy integration, wide working temperature range and good linearity, and is very suitable for occasions such as the demagnetization module 0 which have high requirements on magnetic field detection accuracy, real-time performance and compact structure.

[0104] As a preferred embodiment, the magnetic conducting function layer 3 plays a core role in enhancing and optimizing the magnetic field generated by the wire layer 2, and its performance directly affects the strength, uniformity of the demagnetizing magnetic field and the demagnetizing effect on the magnetic stripe of the bank card 06.

[0105] In the preferred embodiment of the present application, the magnetic conducting function layer 3 adopts a ferrite core, and the ferrite core is in a plate-like body structure. The ferrite core is a high-permeability, low-conductivity magnetic material made of ferrite as the main component, which is widely used in magnetic field guiding, noise suppression and magnetic circuit optimization in electronic devices. The ferrite core is designed as a plate-like body structure, i.e. its shape is flat and sheet-like or plate-like, with a relatively small thickness, and the length and width are matched with the projection area of the wire layer 2, the size of the magnetic stripe of the bank card 06 and the card path.

[0106] Embodiment 2

[0107] Referring to Figures 1-6 , the present application also provides a bank card 06 demagnetizing device as described in Embodiment 1, aiming to solve the deficiencies of traditional demagnetizing equipment in terms of bank card 06 conveying stability, demagnetizing process control precision, demagnetizing effect reliability and the like, through reasonable mechanical structure design, precise conveying control and efficient demagnetizing module 0 integration, realizing safe, complete and controllable destruction of the magnetic stripe data of the bank card 06, and meeting the high standard requirements of the financial industry for data security.

[0108] The bank card 06 demagnetizing device comprises:

[0109] The rack 01 is the mechanical support base of the entire device, used for installing and fixing other functional components, ensuring the stability of the overall structure and the rationality of the layout, and providing necessary protection and installation space for the internal components;

[0110] The card conveying channel 02 is arranged inside the rack 01, and is a limited passage for the bank card 06 to pass through, with a layout and size designed according to the standard size of the bank card 06 and the arrangement position of the demagnetizing module 0, to ensure that the bank card 06 can smoothly pass along the predetermined path before, during and after entering the demagnetizing area;

[0111] The upper card conveying assembly 03 is arranged above the card conveying channel 02, and is used to drive the bank card 06 to move forward from above, being one of the main power sources in the conveying process of the bank card 06;

[0112] The lower card conveying assembly 04 is arranged below the card conveying channel 02 and comprises a lower support frame 041 and a demagnetization module 0 arranged on one side of the lower support frame 041, that is, the demagnetization module 0 provided in the embodiment 1 of the application, the demagnetization module 0 provides a precise and efficient demagnetization magnetic field for the magnetic stripe of the bank card 06 and is a core functional component for realizing data security destruction.

[0113] The controller 05 is arranged outside the rack 01, is electrically connected with the demagnetization module 0, is used for controlling the working state of the demagnetization module 0, such as time sequence control of each coil and current regulation, and receives feedback signals from the inside of the demagnetization module 0 or associated sensors to realize dynamic monitoring and parameter adjustment of the demagnetization process and ensure that the demagnetization effect is reliable and up to standard.

[0114] The application integrates the modular high-performance demagnetization module 0, the upper and lower coordinated card conveying driving structure, the compact and reasonable rack 01 channel layout and the centralized management of the external intelligent controller 05, and constructs a bank card 06 demagnetization device which is stable in operation, accurate in control and safe and efficient. The high-performance demagnetization module 0 is integrated below the card conveying channel 02, so that the whole device can apply a uniform, controllable and high-strength demagnetization magnetic field at the best action position close to the magnetic stripe while realizing stable transmission of the card, from the source, guaranteeing the efficiency and thoroughness of the demagnetization process, effectively preventing the risk of magnetic stripe information residual and data leakage. The bank card 06 demagnetization device further comprises an upper card conveying assembly 03 and a lower card conveying assembly 04 arranged above and below the card conveying channel 02 respectively and acting on the bank card 06 to realize stable, continuous and controllable conveying of the bank card 06. The double-end driving structure not only improves the stability and anti-deviation ability during card conveying, but also ensures that the bank card 06 is accurately positioned and stably posed when passing through the demagnetization area, so that the magnetic stripe is always within the best action range of the demagnetization module 0. The application not only effectively overcomes the technical shortcomings of traditional equipment in card conveying, magnetic field action, heat management and effect feedback, but also realizes high automation, uniformity and traceability of the demagnetization process, significantly improves the security level and processing efficiency of financial data destruction.

[0115] As a preferred embodiment, the upper card conveying assembly 03 comprises two driven rubber rollers 031 and a position sensor 032 group for realizing stable driving and accurate position detection of the bank card 06.

[0116] Two active rubber rollers 031 are arranged in parallel and above the card conveying channel 02, and the axis direction is perpendicular to the card feeding direction of the bank card 06; the two active rubber rollers 031 are the main power output components of the upper card conveying assembly 03, and are driven to rotate by a motor or other driving mechanism during device operation, and drive the bank card 06 above to move forward by contacting and applying frictional driving force to the upper surface of the bank card 06, so as to provide power for the bank card 06 to be demagnetized to feed and discharge the card, and ensure that the bank card 06 can move stably, continuously and controllably along the card conveying channel 02 and accurately reach the action area of the demagnetization module 0.

[0117] The sensor group is used for real-time detection of the current position of the bank card 06 in the card conveying channel 02, so as to ensure that the bank card 06 can accurately enter the demagnetization area, and provide key position reference information for time sequence control, magnetic field action time and the like of the demagnetization module 0.

[0118] Specifically, the position sensor 032 group includes:

[0119] At least one position sensor 032 is arranged at the first end of one inner side of the rack 01, and is used for detecting the entering state of the bank card 06, and serving as a reference signal for starting or time sequence triggering of the demagnetization process;

[0120] At least one position sensor 032 is arranged at the middle part of the other inner side of the rack 01, and is used for monitoring the intermediate position of the bank card 06 in the card conveying channel 02, so as to ensure that the bank card 06 has accurately reached the action area of the demagnetization module 0, or provide a position basis for parameter adjustment in the demagnetization process;

[0121] At least one position sensor 032 is arranged at the end of one inner side of the rack 01, and is used for detecting the leaving state of the bank card 06, and serving as a trigger signal for completion of demagnetization or subsequent process.

[0122] The arrangement of the sensor group arranged in multiple positions and in different regions enables the application to realize real-time sensing and feedback of the full-path position state of the bank card 06 in the card conveying channel 02, and provides accurate time sequence control basis and process monitoring capability for the entire demagnetization process, and improves the reliability and intelligent level of the demagnetization operation.

[0123] As a preferred embodiment, the lower card conveying assembly 04 further includes two driven conveying rollers, and the two driven conveying rollers are arranged in a one-to-one correspondence with the two active rubber rollers 031 in an upper and lower arrangement, so as to form a clamping type conveying structure in cooperation with the upper card conveying assembly 03, and jointly act on the bank card 06 to realize more stable and reliable conveying effect.

[0124] Specifically, the driven conveying roller includes:

[0125] The driven roller shaft 042 provides installation and rotation support for the driven roller 043, and is usually fixed or adjustably mounted on the lower support frame 041;

[0126] The driven roller 043 is rotatably arranged at the middle part of the driven roller shaft 042, and the outer surface thereof is usually made of elastic or soft material, such as rubber, and is in contact with the lower surface of the bank card 06 to form a clamping force together with the upper active roller 031, so as to ensure that the bank card 06 does not deviate or slip during the conveying process.

[0127] The two elastic members 044 are respectively abutted against the two ends of the driven roller shaft 042, so that the driven roller shaft 042 can elastically stretch and contract in the direction perpendicular to the axial direction (i.e., the up-down direction) of the lower support frame 041; preferably, in the embodiment, the elastic member 044 is a compression spring.

[0128] Through the elastic abutment action of the two elastic members 044, the driven roller shaft 042 can float up and down within a certain range, so as to ensure that the driven roller 043 is always in good contact with the lower surface of the bank card 06, and even if there is a slight difference in the thickness of the bank card 06 or a slight fluctuation occurs during the conveying process, the elastic member 044 can still adaptively adjust to maintain stable clamping force and conveying effect. Specifically, refer to Figure 5 and Figure 6 The lower support frame 041 is provided with mounting columns for mounting the two compression springs, and the two compression springs are respectively sealed in the corresponding mounting columns by the pressing plate 045.

[0129] Embodiment 3

[0130] The application also provides a demagnetization method of the bank card demagnetization device as described in Embodiment 2, and the steps thereof include:

[0131] S1, activate the multi-section coil in a region-by-region and time-sequential manner to achieve precise demagnetization:

[0132] In step S1, when the bank card 06 enters the card conveying channel 02, it is driven by the upper card conveying assembly 03 to move forward stably, continuously and controllably in a preset moving direction, so as to ensure that the magnetic stripe of the bank card 06 can pass through the action area of the demagnetization module 0 in sequence.

[0133] Synchronously with the movement of the bank card 06, the multi-section coil in the demagnetization module 0 is activated in the following regions in a preset time-sequential logic: the first section coil 21→the middle section coil 22→the first section coil 21 and the middle section coil 22 are synchronously activated→the last section coil 23. The specific control time-sequential logic is shown in Figure 13 , and Figure 13In the middle, between t0-t1, only the first section coil 21 works (demagnetize the front section of the magnetic stripe); between t1-t2, the first section coil 21 is closed, and the middle section coil 22 works (demagnetize the middle section of the magnetic stripe); between t2-t3, the first section coil 21 and the middle section coil 22 work at the same time (cover the front-middle section overlapping area E of the magnetic stripe); between t3-t4, the middle section coil 22 is closed, and the last section coil 23 works (demagnetize the rear section of the magnetic stripe);

[0134] This timing design is based on the relative position relationship between the different areas of the bank card 06 magnetic stripe and each section coil during movement, as well as the optimal coverage and superposition effect of the magnetic field action, and its purpose is to:

[0135] Demagnetizing magnetic field is generated in different areas, and each section coil is responsible for applying a magnetic field to a specific area on the magnetic stripe, ensuring that each part of the magnetic stripe within the full length range can be affected by the targeted magnetic field;

[0136] Differential control of magnetic field action time and strength, by activating different coils at different times or simultaneously, can flexibly adjust the magnetic field generation strategy of each area according to the actual working conditions such as magnetic stripe material, card speed, magnetic field response characteristics, etc., to achieve precise and efficient magnetic field energy application;

[0137] The activation time of each section coil is controlled to t milliseconds (preferably t=5ms), which is an optimized selection that can ensure the generation of an effective magnetic field with sufficient strength and duration for each section coil, while avoiding energy waste, local overheating or magnetic performance degradation due to excessive action time, achieving a good balance between time efficiency and demagnetization effect in the demagnetization process.

[0138] This regional, time-sequential, and differential coil activation strategy allows the demagnetizing magnetic field to form a uniform, continuous, and high-strength effect at different positions on the magnetic stripe, effectively avoiding the problems of uneven demagnetization, obvious boundary effects, or local residues caused by single magnetic fields or simple splicing in traditional methods, significantly improving the spatial uniformity and overall reliability of the demagnetization effect.

[0139] S2, real-time magnetic field detection, dynamic feedback and secondary demagnetization, to ensure that the demagnetization effect meets the standards:

[0140] While the bank card 06 moves along the card conveying channel 02 and receives demagnetization processing by multiple section coils, the application further collects and dynamically monitors the magnetic field signals in the demagnetization area in real time through several magnetic sensors 5 arranged in the demagnetization module 0, which serves as the core basis for judging whether the demagnetization effect meets the standards, including the following steps:

[0141] S21, real-time collection and signal feedback of the magnetic sensor 5:

[0142] The magnetic sensor 5 (for example, preferably using a Hall sensor) is fixedly installed in the degaussing module 0, the non-conductive area of the wire layer 2, and is electrically connected with the controller 05; during the movement of the bank card 06, the sensors sense the magnetic field strength in the degaussing area in real time, and transmit the collected original magnetic field signal to the controller 05.

[0143] S22, the controller 05 performs signal filtering and threshold comparison:

[0144] After the controller 05 receives the original signal of the magnetic sensor 5, it is first filtered (such as removing high-frequency noise, environmental interference or circuit coupling noise, etc.) to improve the signal-to-noise ratio and accuracy of the signal; then, the filtered signal is compared with a preset dynamic threshold, which can be adaptively set or adjusted in real time according to different degaussing stages, coil configurations, card moving speeds, etc., for determining whether the magnetic field strength of the current degaussing area reaches the standard of effective degaussing.

[0145] S23, determining the degaussing effect and triggering secondary degaussing:

[0146] When the output signals of ≥2 magnetic sensors 5 exceed the dynamic threshold, it indicates that the magnetic field strength in the current degaussing area does not reach the expected effect, that is, the degaussing is insufficient, and there is a risk of residual magnetic stripe data. At this time, the controller 05 will automatically trigger the secondary degaussing operation of the corresponding coil (i.e. one or more coils acting on the area), by enhancing the current intensity of the coil in the area, prolonging the action time or adjusting the excitation timing, to apply a stronger magnetic field again to ensure that the residual information on the magnetic stripe in the area is further eliminated.

[0147] To further illustrate the degaussing effect triggering mechanism of the present application, the following will take the Hall sensor as the magnetic sensor 5 as an example to illustrate the residual magnetic field detection, specifically, the Hall sensor uses AH49E model, 3 Hall sensors are arranged along the magnetic stripe path of the bank card 06, and a voting residual judgment detection logic is used; in the degaussing stage, the coil passes through an alternating current, and the bank card 06 magnetic field gradually decays; in the detection stage, the Hall sensor outputs a Hall voltage V H in real time, which is sent to the controller 05 after filtering, if the output Hall voltage V H of ≥2 Hall sensors >1.3mV, an alarm is triggered and secondary degaussing is started, and the specific determination principle is shown in the following table, in which H1 represents the first Hall sensor, H2 represents the second Hall sensor, and H3 represents the third Hall sensor.

[0148]

[0149] The feedback control mechanism forms a closed loop control process of "detection-judgment-regulation", so that the degaussing process no longer depends on fixed parameters, but can be dynamically optimized and locally compensated according to the actual magnetic field response, significantly improves the intelligent level, control accuracy and safety and reliability of degaussing, effectively reduces the risk of magnetic stripe data residual, and ensures that each bank card 06 can reach the financial level data destruction standard. Through the synergistic effect of the core steps of the present application, such as the activation of the multi-section coil in the time sequence of the region, real-time magnetic field signal detection, dynamic threshold comparison and condition-triggered secondary degaussing, uniform, efficient and controllable degaussing processing of the bank card 06 magnetic stripe is realized, and the spatial consistency of the degaussing effect, the magnetic field strength and the data destruction reliability are significantly improved.

[0150] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation, direct / indirect application in other related technical fields under the inventive concept of the present application and the content of the specification and drawings are included in the patent protection scope of the present application.

Claims

1. A demagnetizing module, characterized in that, include: Insulating substrate; The conductor layer includes multiple coil segments, each of which has its conductors laid out in a spiral pattern on the insulating substrate. The multiple coil segments are arranged sequentially along the length of the bank card's magnetic stripe, with adjacent coils overlapping each other by a preset length. The overlapping area uses tapered wires or cross-wound wires. Each coil segment is connected to an independent H-bridge circuit to support time-sharing or synchronous control. A magnetic conductive layer is disposed on the side of the conductor layer opposite to the insulating substrate and covers the projected area of ​​the conductor layer, which is used to enhance the magnetic field strength generated by the conductor layer and optimize its distribution uniformity. The heat dissipation layer is connected to the magnetically conductive functional layer via a thermally conductive medium; Several magnetic sensors are arranged at intervals in the non-conductive area of ​​the conductor layer and electrically connected to the controller. They are used to detect the magnetic field signal of the demagnetization area in real time and feed it back to the controller so as to dynamically adjust the demagnetization parameters of each section of the coil.

2. The demagnetizing module according to claim 1, characterized in that, The non-working plane of the magnetic conductive functional layer has several heat-conducting grooves, and the heat-conducting grooves are filled with heat-conducting metal mesh.

3. A demagnetizing module according to claim 2, characterized in that, The heat dissipation layer is bonded to the non-working plane of the magnetically conductive functional layer via a phase change thermal pad. The heat dissipation layer includes a metal heat sink and a plurality of heat dissipation fins disposed on the side of the metal heat sink away from the phase change thermal pad.

4. A demagnetizing module according to claim 3, characterized in that, An aluminum oxide insulating layer is provided between the thermally conductive metal mesh and the magnetically conductive functional layer, and the surface of the thermally conductive metal mesh is flush with the non-working surface of the magnetically conductive functional layer. The phase change thermal pad has a thickness of 0.15 mm after pressing and can fully cover the projected area of ​​the thermally conductive metal mesh.

5. A demagnetizing module according to any one of claims 1-4, characterized in that, The conductive layer and the magnetically conductive functional layer are bonded together with thermally conductive adhesive, and the thermally conductive adhesive layer has adhesive reduction grooves in the non-overlapping area. Furthermore, when the overlapping area uses a tapered wire, the wire width gradually changes from 0.3 mm to 0.5 mm to enhance the magnetic field coupling between adjacent coils.

6. A demagnetizing module according to any one of claims 1-4, characterized in that, Among the plurality of magnetic sensors, at least one is provided at the end of the first section of the coil, one is provided at the middle of the middle section of the coil, and one is provided at the beginning of the last section of the coil. Each of the magnetic sensors is at least 2 mm away from the edge of the nearest coil; and each of the magnetic sensors is fitted with a permalloy shielding sheet on its back.

7. A bank card demagnetizing device, characterized in that, include: frame; The card input channel, located within the rack, is used for bank cards to be demagnetized to pass through; The card input component is located above the card input channel and is used to drive the bank card to move along the card input channel; A lower card feeding assembly is disposed below the card feeding channel, including a lower support frame and a demagnetizing module disposed on one side of the lower support frame; the demagnetizing module is the demagnetizing module as described in any one of claims 1-6; The controller, located outside the frame, is used to control the operation of the demagnetization module and receive feedback signals.

8. A bank card demagnetizing device according to claim 7, characterized in that, The card input component includes: Two active rubber rollers are spaced apart and parallel to each other and positioned directly above the card feeding channel to provide power for the bank card to be demagnetized to enter and exit the card. The position sensor group includes at least one position sensor located at the first end of one inner side of the rack, at least one position sensor located in the middle of the other inner side of the rack, and at least one position sensor located at the end of one inner side of the rack, for real-time detection of the position of the bank card in the card input channel.

9. A bank card demagnetizing device according to claim 8, characterized in that, The card feeding assembly further includes two driven conveying rollers, which are respectively arranged vertically and vertically corresponding to the two active rubber rollers; the driven conveying rollers include: The driven wheel axle is mounted on the lower support frame; The driven rubber roller is rotatably disposed in the middle of the driven wheel shaft; Two elastic elements abut against the two ends of the driven wheel shaft, respectively, to allow the driven wheel shaft to elastically extend and retract within the lower support frame in a direction perpendicular to its axial direction, so as to ensure that the lower surface of the bank card remains in contact with the driven rubber roller.

10. A demagnetizing method for a bank card demagnetizing device as described in any one of claims 7-9, characterized in that, The steps include: S1. The bank card enters the card input channel and moves in a preset direction under the action of the upper card input component; at the same time, the first segment coil, the middle segment coil, the first segment coil and the middle segment coil synchronously, and the last segment coil in the multi-segment coil of the demagnetization module are activated in a preset sequence according to the preset timing. The activation time of each segment coil is 5ms, so as to generate a demagnetizing magnetic field in a regional and differentiated manner to demagnetize the bank card. S2. Simultaneously, during the mobile demagnetization process of the bank card, several magnetic sensors arranged in the demagnetization module collect the magnetic field signal of the demagnetization area in real time, and feed the collected magnetic field signal back to the controller for filtering processing and comparison with the preset dynamic threshold to determine whether the current demagnetization effect meets the standard. When the output signals of ≥2 magnetic sensors exceed the dynamic threshold, it is determined that the corresponding area is not sufficiently demagnetized, and the controller is triggered to perform a secondary demagnetization operation on the corresponding coil.

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