A nano-graphene medical mask charge quantity and static electricity distribution detection device

Abstract

The application discloses a kind of nanometer graphene medical mask charge quantity and electrostatic distribution detection device, it is related to medical instrument detection technical field, including rack, faraday cylinder component, sample fixing mechanism, drive mechanism, overall charge quantity test unit and electrostatic distribution test unit;Faraday cylinder component is located at the top of rack, and shielding test cavity is formed inside;Sample fixing mechanism is located inside shielding test cavity, for the accurate positioning and compatible fixation of mask sample;Drive mechanism is located on the upside of sample fixing mechanism, for driving test unit to complete multidimensional displacement adjustment;Overall charge quantity test unit and electrostatic distribution test unit are integrated on drive mechanism, can respectively complete the quantitative detection of mask overall charge quantity and the grid point-by-point detection of in-plane electrostatic distribution.The application can complete two core detections simultaneously in the same shielding environment, avoid electrostatic interference and detection error caused by sample transfer, with high detection precision and strong compatibility.

Description

Technical Field

[0001] This invention relates to the field of medical device testing technology, and more specifically, to a device for detecting the charge and electrostatic distribution of a nano-graphene medical mask. Background Technology

[0002] Medical masks are core consumables for pathogen control in medical settings, mainly including three categories: disposable medical masks, surgical masks, and protective masks. The core filter layer of medical masks mostly uses electret polypropylene material. This material can significantly improve the air filtration efficiency for aerosols, droplets, and pathogens through electrostatic adsorption. Its electrostatic storage performance directly determines the protective effect and service life of the mask.

[0003] Nanoscale graphene materials possess a unique nanoscale two-dimensional sheet structure. On one hand, they can physically inactivate microorganisms through the "nanoknife" effect; on the other hand, their ultrathin sheet structure has a strong adsorption capacity for ultrafine particles. Theoretically, they can synergize with electret polypropylene materials to significantly improve the filtration efficiency and protective performance of medical masks. Currently, research on nanoscale graphene medical masks is mostly qualitative, with the core bottleneck being the lack of dedicated quantitative detection devices. Existing detection equipment can only achieve macroscopic detection of the overall charge of the mask, but cannot accurately detect the charge in the micro-regions within the mask surface. This makes it difficult to establish a quantitative correlation between the content and in-plane distribution of nanoscale graphene and the mask's filtration efficiency, severely restricting the performance optimization and mechanism research of nanoscale graphene medical masks.

[0004] Therefore, developing a dedicated device that can simultaneously perform quantitative detection of the overall charge of a nano-graphene medical mask and precise detection of the gridded in-plane electrostatic distribution has become a pressing technical problem to be solved in this field. Summary of the Invention

[0005] To address the aforementioned deficiencies in existing technologies, the present invention aims to provide a device for detecting the charge and electrostatic distribution of nano-graphene medical masks. This device can simultaneously perform rapid detection of the overall charge of the mask and point-by-point scanning detection of the electrostatic distribution in the micro-area within the mask. It provides reliable quantitative data support for the study of the mechanism for improving the filtration efficiency of nano-graphene medical masks and fills the gap in the existing technology for detecting the micro-area charge of nano-graphene medical masks.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A device for detecting the charge and electrostatic distribution of a nano-graphene medical mask includes a frame, a Faraday cylinder assembly, a sample fixing mechanism, a driving mechanism, an overall charge testing unit, and an electrostatic distribution testing unit.

[0007] The frame serves as the support base for the device, with four sets of insulating rubber feet at the bottom to isolate the interference of ground static electricity on the testing environment and to provide shock absorption and anti-slip function. A Faraday cylinder assembly is located on the top left side of the frame, and a shielded test chamber is formed inside the Faraday cylinder assembly to provide a closed environment free from external static electricity interference for the testing process. A control unit is located on the top right side of the frame to realize the fully automated control of the device and the processing of test data.

[0008] The sample fixing mechanism is located on the top of the frame and inside the shielded test chamber of the Faraday cylinder assembly. It includes an insulating support platform, a scale assembly, and two sets of adjustable clamping and fixing assemblies. The insulating support platform is made of insulating acrylic sheet and is fixed to the frame to prevent interference from the platform's own electrical charge on the test results. The scale assembly is provided on the insulating support platform. Of the two sets of adjustable clamping and fixing assemblies, one set is fixed to the left side of the insulating support platform as the fixed end, and the other set is slidably located on the right side of the insulating support platform as the moving end. The spacing can be adjusted according to the size of the mask sample to achieve compatible fixing of masks of different specifications.

[0009] The driving mechanism is located on the upper side of the sample fixing mechanism and inside the shielded test chamber of the Faraday cylinder assembly. It includes a fixed bracket, a longitudinal electric linear slide, and a transverse electric linear slide. The bottom of the fixed bracket is fixed to the frame to provide stable support for the driving mechanism. The top front side of the fixed bracket is equipped with a longitudinal electric linear slide driven by a servo motor, which can drive the test unit to move along the length of the mask sample. A support plate is fixedly connected to the slide of the longitudinal electric linear slide. Two sets of electric push rods A are symmetrically arranged on the support plate. The lower end of the electric push rod A is fixedly connected to the fixed plate, which can drive the fixed plate and the test unit at the bottom to perform vertical lifting and lowering adjustment to adapt to mask samples of different thicknesses, while controlling the test distance between the test unit and the sample surface. A transverse electric linear slide is fixedly installed at the bottom of the fixed plate, which can drive the test unit to move along the width of the mask sample.

[0010] The overall charge quantity testing unit is horizontally positioned at the bottom of the fixed plate, parallel to the horizontal electric linear slide, and is used to quantitatively detect the overall charge quantity of the mask sample. The electrostatic distribution testing unit is positioned on the slide of the horizontal electric linear slide and can move with the horizontal electric linear slide. In conjunction with the vertical electric linear slide, it can complete the electrostatic detection at any point within the surface of the mask sample, realizing a gridded scan of the electrostatic distribution within the surface.

[0011] Furthermore, the scale assembly includes a length scale and a width scale mounted on an insulating support platform for measuring the length and width of the mask. The length scale and the width scale are set perpendicularly. A test positioning mark is provided at the upper left corner of the insulating support platform. The starting ends of the length scale and the width scale are aligned with the test positioning mark. By cooperating with the scale assembly, the mask sample can be accurately positioned, ensuring the consistency of the test points in multiple tests of the same sample and improving the repeatability and reliability of the test data.

[0012] Furthermore, the adjustable clamping and fixing assembly includes a beam frame, insulating pressure plates, an adjusting slider, an adjusting groove, and two sets of vertically adjustable insulating clamping screws. The beam frame has two sets of insulating clamping screws, each with an insulating pressure plate fixed to its bottom for clamping and fixing the mask sample along its width, preventing displacement of the sample during testing. Simultaneously, the insulating material prevents interference from the clamping components' charge on the sample. One set of insulating clamping screws is screwed to the beam frame, serving as the fixed clamping end, while the other set is screwed to the adjusting slider, serving as the sliding clamping end. An adjusting groove is provided inside the beam frame, and the adjusting slider is slidably positioned within the groove. The spacing between the two sets of insulating clamping screws can be adjusted according to the width of the mask sample, adapting to mask samples of different widths.

[0013] Furthermore, the insulating support platform has guide grooves on both the front and rear sides of the right end, and the two ends of the beam frame on the adjustable clamping and fixing assembly on the right side are slidably locked in the guide grooves; the length adjustment range of the beam frame on the right side is 13.5-17.5cm, which fully covers the conventional size specifications of disposable medical masks, medical surgical masks and medical protective masks in the existing national standards, and realizes the compatibility and fixing of all types of medical masks.

[0014] Furthermore, the rear bottom of the Faraday cylinder assembly is hinged to the frame via two sets of damping hinges, and the front side of the Faraday cylinder assembly is provided with a handle. The Faraday cylinder assembly can be opened by flipping the handle upwards to complete the clamping and placement of samples, making operation convenient. The frame has a positioning slot inside that matches the bottom of the Faraday cylinder assembly. The bottom of the Faraday cylinder assembly is inserted into the positioning slot to ensure the sealing and positioning accuracy of the Faraday cylinder assembly after it is closed, and to prevent external static electricity leakage from entering the shielded test chamber.

[0015] Furthermore, the Faraday cylinder assembly includes an inner cylinder and an outer cylinder composed of a double-layered square metal cover. The inner and outer cylinders are insulated from each other, and the outer cylinder is grounded. When the inner and outer cylinders are fastened together, they form a closed shielded test chamber, which can effectively shield the interference of external electric fields and static electricity on the test environment. The bottoms of the inner and outer cylinders are insulatedly connected by an insulating base pad to prevent charge conduction between the inner and outer cylinders. The Faraday cylinder assembly is also equipped with an electrostatic elimination module, which is used to eliminate residual static electricity in the shielded test chamber before testing, as well as additional static electricity generated during the clamping of mask samples, greatly reducing the impact of background noise on micro-area charge detection and improving detection accuracy.

[0016] Furthermore, the overall charge quantity testing unit includes a C-shaped slot frame, test rods A, a translation adjustment component, and a translation slide. The C-shaped slot frame is fixed to the bottom of the fixed plate. The translation adjustment component is located at the right end of the C-shaped slot frame, and a translation slide is opened at the bottom of the C-shaped slot frame corresponding to the translation adjustment component. Two sets of test rods A are located at the bottom of the C-shaped slot frame. One set of test rods A is fixed to the left end of the bottom of the C-shaped slot frame, and the upper end of the other set of test rods A is fixedly connected to the translation adjustment component. It can be translated and adjusted with the translation adjustment component to adapt to mask samples of different lengths and realize synchronous contact detection of both ends of the mask sample. The diameter of the test rod A matches the diameter of the multimeter probe, and its length is 17.5cm. It can be directly adapted to the detection interfaces of mainstream high-precision electrometers and digital multimeters on the market without additional modification, and has strong versatility.

[0017] Furthermore, the translation adjustment assembly includes a drive motor, a threaded screw, and a nut seat. The threaded screw is mounted on the right end of the C-shaped slot frame via a shaft seat. The right end of the threaded screw is connected to the output end of the drive motor. A nut seat is mounted on the threaded screw. The upper end of the test rod A passes through the translation slide and is fixedly connected to the bottom of the nut seat. The drive motor drives the threaded screw to rotate, thereby causing the nut seat and the movable test rod A to move linearly along the translation slide, realizing the automated and precise adjustment of the distance between the two sets of test rods A, adapting to the testing needs of masks of different specifications.

[0018] Furthermore, the electrostatic distribution testing unit includes an electric push rod B, a push rod fixing frame, a lifting plate, and a test rod B. The electric push rod B is fixedly installed on the slide of the transverse electric linear slide table through the push rod fixing frame. A lifting plate is provided on the lower output end of the electric push rod B, which can drive the lifting plate to perform precise vertical lifting and lowering, controlling the contact pressure and testing distance between the test rod B and the surface of the mask sample. Two sets of test rods B are symmetrically arranged at the bottom of the lifting plate, which can simultaneously complete the detection of adjacent points, improving the detection efficiency. The length of the test rod B is 1cm, the spacing between adjacent test rods B is 1cm, and the diameter of the test rod B matches the diameter of the multimeter probe, which can be adapted to the micro-area charge detection of a high-precision electrostatic meter to achieve fine electrostatic distribution scanning of a 1cm×1cm grid within the mask surface.

[0019] Furthermore, the control unit integrates a touch-screen control panel. The control unit is electrically connected to the longitudinal electric linear slide, the transverse electric linear slide, the overall charge quantity testing unit, the electrostatic distribution testing unit, electric push rod A, electric push rod B, and the electrostatic elimination module within the Faraday cylinder assembly. The control unit has a built-in PLC control module, which can preset test parameters via the control panel, including the grid size of the gridded scan, test points, single-point test time, and test rod lifting height. Simultaneously, it can control the timing of the actions of each test component, automatically completing the entire process of electrostatic elimination, overall charge quantity testing, and gridded electrostatic distribution scanning. It also performs real-time acquisition, storage, display, and visualization output of the test data, generating an electrostatic distribution cloud map and a test report. The operation is simple and the testing efficiency is high.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention is the first to address the testing needs of nano-graphene medical masks, integrating two major functions: overall charge quantity testing and in-plane electrostatic distribution gridding testing. Both tests can be completed within the same shielded testing chamber, avoiding electrostatic interference and testing errors caused by sample transfer. It fills the technical gap in the quantitative detection of micro-area charge in nano-graphene medical masks and provides core testing equipment support for establishing a quantitative correlation between nano-graphene content, distribution, and mask filtration efficiency.

[0021] 2. The sample fixing mechanism of the present invention adopts an adjustable design, with the length adjustment range covering 13.5-17.5cm. The width direction is adapted by a sliding adjustable insulating clamping screw, which can be compatible with medical mask samples of different specifications and models. At the same time, the scale component and positioning mark points achieve precise positioning of the sample, ensuring the repeatability of the points and the reliability of the data in the electrostatic distribution detection.

[0022] 3. The Faraday cylinder assembly in this invention adopts a double-layer grounded Faraday cylinder structure, which can effectively shield the electrostatic interference of the external environment. Combined with the electrostatic elimination process before testing, it greatly reduces the impact of background noise on micro-area charge detection and improves the detection accuracy. At the same time, the standardized test sequence design and the fixed test time for a single point avoid detection deviation caused by human operation, and the repeatability and comparability of the test results are strong.

[0023] 4. This invention achieves full automation of the testing process through a PLC control module. The test data can be displayed in real time, automatically recorded and visualized. It is easy to operate and has high testing efficiency. It is suitable for both laboratory mechanism research and product quality sampling inspection in industrial production.

[0024] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of the present invention from another angle.

[0028] Figure 3 This is a partial disassembly diagram of the present invention.

[0029] Figure 4 This is a cross-sectional view of the Faraday cylinder assembly in this invention.

[0030] Figure 5 This is a partial structural diagram of the present invention.

[0031] Figure 6 This is a schematic diagram of the sample fixing mechanism in this invention.

[0032] Figure 7 This is a schematic diagram of the drive mechanism in this invention.

[0033] Figure 8 This is a schematic diagram of the overall charge quantity testing unit and the electrostatic distribution testing unit in this invention.

[0034] Figure 9 This is a schematic diagram of the overall charge quantity testing unit and the electrostatic distribution testing unit in this invention from another angle.

[0035] Figure 10 This is a schematic diagram of the bottom structure of the overall charge quantity testing unit and the electrostatic distribution testing unit in this invention.

[0036] In the diagram: 1. Frame; 2. Insulating rubber feet; 3. Control unit; 4. Control panel; 5. Faraday cylinder assembly; 51. Damping hinge; 52. Handle; 53. Outer cylinder; 54. Inner cylinder; 55. Insulating base pad; 6. Sample fixing mechanism; 61. Insulating support platform; 62. Test positioning mark; 63. Adjustable clamping fixing assembly; 631. Beam frame; 632. Insulating pressure plate; 633. Adjusting slider; 634. Insulating clamping screw; 635. Adjusting slide; 64. Scale assembly; 65. Guide slide; 7. Drive mechanism; 71. Fixed support. 72. Electric push rod A; 73. Longitudinal electric linear slide; 74. Slide base; 75. Support plate; 76. Fixing plate; 77. Overall charge quantity testing unit; 771. C-shaped slot frame; 772. Test rod A; 773. Translation adjustment assembly; 7731. Drive motor; 7732. Threaded screw; 7733. Nut seat; 774. Translation slide; 78. Lateral electric linear slide; 79. Static electricity distribution testing unit; 791. Electric push rod B; 792. Push rod fixing frame; 793. Lifting plate; 794. Test rod B; 8. Positioning slot. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] It should be noted that in the description of this invention, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] Example 1: This example provides a specific implementation structure for a device for detecting the charge quantity and electrostatic distribution of a nano-graphene medical mask, as follows: Figure 1-10 As shown, it includes a frame 1, a Faraday cylinder assembly 5, a sample fixing mechanism 6, a driving mechanism 7, an overall charge quantity testing unit 77, and an electrostatic distribution testing unit 79.

[0041] The frame 1 is a rectangular metal frame structure with good structural strength. Insulating rubber feet 2 are installed at the four corners of the bottom of the frame 1. These feet are made of anti-static nitrile rubber, which not only isolates the interference of static electricity from the ground on the testing environment but also provides shock absorption and anti-slip properties, ensuring the stability of the device during operation. A Faraday cylinder assembly 5 is installed on the top left side of the frame 1, and a control unit 3 is bolted to the top right side of the frame 1. The control unit 3 is a waterproof and dustproof metal electrical control box structure, suitable for use in various scenarios in laboratories and production workshops.

[0042] The Faraday cylinder assembly 5 is a box-shaped structure that can be flipped open from the front. Its rear bottom is hinged to the frame 1 via two symmetrically arranged damping hinges 51. An insulating handle 52 is fixedly installed in the middle of the front side of the Faraday cylinder assembly 5. Operators can flip the Faraday cylinder assembly 5 upwards using the handle 52 to clamp and remove mask samples. The damping hinges 51 allow the Faraday cylinder assembly 5 to be suspended at any angle after opening, making operation convenient. The top plate of the frame 1 has a positioning groove 8 that matches the bottom contour of the Faraday cylinder assembly 5. After the Faraday cylinder assembly 5 is closed, its bottom edge precisely engages in the positioning groove 8, ensuring both sealing after closure and preventing displacement of the Faraday cylinder assembly 5 during use, thus guaranteeing the stability of the shielding effect.

[0043] Specifically, the Faraday cylinder assembly 5 includes an inner cylinder 54 and an outer cylinder 53, both constructed of double-layered square metal covers. Both cylinders 54 and 53 are made of stainless steel with polished surfaces to reduce charge adsorption. An insulating gap is provided between the inner and outer cylinders 54 and 53, which are isolated by insulating support columns made of polytetrafluoroethylene (PTFE) to achieve insulation. The outer cylinder 53 is reliably grounded via a grounding wire. When the inner and outer cylinders 54 and 53 are fastened together, they form a closed shielded test chamber, effectively shielding the test environment from interference from external electric fields and environmental static electricity, meeting the environmental requirements for detecting weak charges in micro-areas. The bottoms of the inner and outer cylinders 54 and 53 are insulatedly connected by an insulating base pad 55 made of high-insulation PTFE material, preventing charge conduction between the inner and outer cylinders and ensuring the accuracy of the test data. The top of the inner wall of the inner cylinder 54 of the Faraday cylinder assembly 5 is also equipped with an ion wind-type static elimination module, used to eliminate residual static electricity in the shielded test chamber before testing, as well as additional static electricity generated during mask sample clamping, significantly reducing the impact of background noise on the test results.

[0044] The sample fixing mechanism 6 is located on the top plate of the frame 1 and is entirely within the shielded test chamber after the Faraday cylinder assembly 5 is closed. It includes an insulating support platform 61, a scale assembly 64, and two sets of adjustable clamping and fixing assemblies 63. The insulating support platform 61 is made of insulating acrylic sheet and is horizontally fixed to the top plate of the frame 1 by bolts to prevent interference from the charged surface of the support platform itself on the charge of the mask sample. The upper surface of the insulating support platform 61 is provided with a scale assembly 64. A cross-shaped test positioning mark point 62 is provided at the upper left corner of the insulating support platform 61. The scale assembly 64 includes a length scale and a width scale on the insulating support platform 61. The length scale is set along the length direction of the insulating support platform 61, and the width scale is set along the width direction of the insulating support platform 61. The two scales are perpendicular to each other, and the starting ends of the length scale and the width scale are aligned with the test positioning mark point 62. By cooperating with the test positioning mark point 62 and the scale assembly 64, the mask sample can be accurately positioned, ensuring the consistency of the test points for the same sample in multiple tests.

[0045] Two sets of adjustable clamping and fixing components 63 are symmetrically arranged on the left and right sides along the length of the insulating support platform 61. The set of adjustable clamping and fixing components 63 on the left side is fixed to the left side of the insulating support platform 61 by bolts, serving as a fixed clamping end; the set of adjustable clamping and fixing components 63 on the right side is slidably arranged on the right side of the insulating support platform 61, serving as a sliding clamping end. Specifically, the adjustable clamping and fixing assembly 63 includes a U-shaped beam frame 631, a circular insulating pressure plate 632, an adjusting slider 633, an adjusting groove 635, and two sets of vertically adjustable insulating clamping screws 634. The beam frame 631 is made of insulating acrylic material, and its crossbeam has two threaded holes. The two sets of insulating clamping screws 634 are respectively assembled into the two threaded holes, and the bottom of each insulating clamping screw 634 is fixed with a circular insulating pressure plate 632 by adhesive bonding. The insulating pressure plate 632 is made of silicone material, which can increase the friction with the mask sample and press and fix the left and right ends of the mask sample along the width direction to prevent the sample from shifting during the test. At the same time, the fully insulating material design eliminates the adsorption and interference of the clamping parts on the sample surface charge.

[0046] The front set of insulating clamping screws 634 is directly screwed into the threaded hole of the beam frame 631, serving as a fixed clamping point; the rear set of insulating clamping screws 634 is screwed into the threaded hole of the adjusting slider 633, serving as a sliding clamping point; the beam frame 631 has an adjusting groove 635 extending along the width direction inside the crossbeam, and the adjusting slider 633 is slidably embedded in the adjusting groove 635, which can drive the rear insulating clamping screws 634 to slide along the adjusting groove 635, thereby adjusting the distance between the two sets of insulating clamping screws 634, adapting to mask samples of different widths, with a width adaptation range of 8cm-12cm, completely covering the conventional width specifications of existing medical masks.

[0047] The insulating support platform 61 has guide grooves 65 extending along its length on both the front and rear sides of its right end. The columns at both ends of the beam frame 631 of the right adjustable clamping and fixing assembly 63 are slidably locked in the guide grooves 65 and can slide left and right along the guide grooves 65 to adjust the distance between the two sets of adjustable clamping and fixing assemblies 63. The length adjustment range of the right beam frame 631 is 13.5-17.5cm, which fully covers the conventional length specifications of disposable medical masks, medical surgical masks and medical protective masks in the existing national standards, and realizes the compatibility and fixing of all types of medical masks.

[0048] The drive mechanism 7 is located above the sample fixing mechanism 6, and is also entirely inside the shielded test chamber of the Faraday cylinder assembly 5. It includes a fixed bracket 71, a longitudinal electric linear slide 73, and a transverse electric linear slide 78. The fixed bracket 71 is a metal bracket, and its bottom is fixed to the top plate of the frame 1 by bolts. It is located behind the insulating support platform 61 and provides stable support for the drive mechanism 7. The longitudinal electric linear slide 73, driven by a servo motor, is horizontally mounted on the top of the front side of the fixed bracket 71. The longitudinal electric linear slide 73 is set along the length direction of the insulating support platform 61 and can drive the test unit to make precise displacement along the length direction of the mask sample. A horizontally positioned support plate 75 is bolted to the slide base 74 of the longitudinal electric linear slide 73. Two sets of electric push rods A72 are symmetrically arranged at both ends of the support plate 75. The push rods of the electric push rods A72 are vertically downwards, and their lower ends are fixedly connected to a horizontal fixed plate 76. This allows for vertical adjustment of the fixed plate 76 and the test unit at its bottom, accommodating mask samples of different thicknesses and precisely controlling the test distance between the test unit and the sample surface. A transverse electric linear slide 78 is bolted to the bottom of the fixed plate 76. The transverse electric linear slide 78 is positioned along the width of the insulating support platform 61, allowing for precise displacement of the test unit along the width of the mask sample.

[0049] The overall charge quantity testing unit 77 is horizontally positioned at the left end of the bottom of the fixed plate 76, parallel to the horizontal electric linear slide 78, and is used to quantitatively detect the overall charge quantity of the mask sample. Specifically, the overall charge quantity testing unit 77 includes a C-shaped slot frame 771, a test rod A 772, a translation adjustment component 773, and a translation slide 774; the C-shaped slot frame 771 is horizontally fixed to the bottom of the fixed plate 76 by bolts, with its opening facing to the right. The right end of the C-shaped slot frame 771 is provided with the translation adjustment component 773, and the bottom plate of the C-shaped slot frame 771 corresponding to the translation adjustment component 773 has a translation slide 774 extending along the length direction. Two sets of cylindrical test rods A772 are located below the base plate of the C-shaped slot frame 771. The test rods A772 are made of gold-plated brass, offering excellent conductivity and resistance to oxidation. The left set of test rods A772 is fixed to the bottom left end of the base plate of the C-shaped slot frame 771, while the upper end of the right set of test rods A772 passes through a translation slide 774 and is fixedly connected to a translation adjustment component 773. This allows for translation adjustment along the translation slide 774 with the translation adjustment component 773, accommodating mask samples of different lengths and enabling simultaneous contact testing of both ends of the mask sample. The diameter of the test rod A772 is the same as that of a standard multimeter probe, and its length is 17.5cm. Its top connects to an external high-precision electrometer via a shielded cable, directly adapting to the testing interfaces of mainstream high-precision electrometers and digital multimeters on the market without additional modification, demonstrating strong versatility.

[0050] The translation adjustment assembly 773 includes a drive motor 7731, a threaded screw 7732, and a nut seat 7733. The threaded screw 7732 is horizontally mounted on the right end of the C-shaped slot frame 771 through bearings at both ends, and is arranged parallel to the translation slide 774. The right end of the threaded screw 7732 is connected to the output end of the drive motor 7731 through a coupling. The drive motor 7731 is a stepper motor, which can precisely control the rotation angle. The threaded screw 7732 is equipped with a matching nut seat 7733. The upper end of the movable test rod A772 passes through the translation slide 774 and is fixedly connected to the bottom of the nut seat 7733. During operation, the drive motor 7731 drives the threaded screw 7732 to rotate, which in turn drives the nut seat 7733 to move linearly along the threaded screw 7732, and finally drives the movable test rod A772 to move linearly along the translation slide 774, realizing the automatic and precise adjustment of the distance between the two sets of test rods A772, adapting to the testing needs of masks of different specifications.

[0051] The electrostatic distribution testing unit 79 is mounted on the slide base 74 of the transverse electric linear slide 78. It can move along the width direction of the mask with the transverse electric linear slide 78, and simultaneously cooperate with the longitudinal displacement of the longitudinal electric linear slide 73 to realize electrostatic detection at any point within the surface of the mask sample, completing the gridded scanning of the electrostatic distribution within the surface. Specifically, the electrostatic distribution testing unit 79 includes an electric push rod B791, a push rod fixing frame 792, a lifting plate 793, and a testing rod B794. The electric push rod B791 is fixedly installed on the slide base 74 of the transverse electric linear slide 78 through the push rod fixing frame 792. The push rod of the electric push rod B791 is set vertically downward, and a horizontal lifting plate 793 is fixedly installed at the bottom of its output end. It can drive the lifting plate 793 to perform precise vertical lifting and lowering, accurately controlling the contact pressure and testing distance between the testing rod B794 and the surface of the mask sample. The bottom of the lifting plate 793 is symmetrically equipped with two sets of cylindrical test rods B794. The test rods B794 are also made of brass plated with gold, which has excellent conductivity. The length of the test rods B794 is 1cm, the spacing between adjacent test rods B794 is 1cm, and the diameter matches the diameter of the multimeter probe. The top of the test rods is connected to an external high-precision electrostatic meter through a shielded cable, which can be adapted to the micro-area charge detection of the high-precision electrostatic meter to realize fine electrostatic distribution scanning of a 1cm×1cm grid inside the mask. The two sets of test rods B794 can simultaneously complete the detection of two adjacent points, improving the detection efficiency.

[0052] The front panel of the control unit 3 integrates a touch-sensitive control panel 4. The control unit 3 internally houses a PLC control module, a data acquisition module, and a data storage module. The control unit 3 is electrically connected to the longitudinal electric linear slide 73, the transverse electric linear slide 78, the drive motor 7731 of the overall charge quantity testing unit 77, the electric push rod B791 of the electrostatic distribution testing unit 79, two sets of electric push rods A72, and the electrostatic elimination module within the Faraday cylinder assembly 5. It is also electrically connected to an external high-precision electrometer via the data acquisition module. Operators can preset test parameters via the control panel 4, including the grid size for the gridded scan, test points, single-point test time, test rod lifting height, and test rod spacing. The PLC control module controls the timing of each test component's actions according to the preset parameters, automatically completing the entire process of electrostatic elimination, overall charge quantity testing, and gridded electrostatic distribution scanning. The data acquisition module collects test data in real time, and the PLC control module stores, displays, and visualizes the data, automatically generating electrostatic distribution cloud maps and standardized test reports. The operation is simple and the testing efficiency is high.

[0053] Example 2: This example, based on the device structure of Example 1, provides the specific workflow of the device for detecting the charge quantity and electrostatic distribution of the nano-graphene medical mask, as follows: Step 1, Pre-test Preparation: Open the Faraday Cylinder Assembly 5 by flipping handle 52 upwards. Lay the nano-graphene medical mask sample to be tested flat on the insulating support stage 61. Using the test positioning mark point 62 as a reference, use the scale assembly 64 to complete the positioning and alignment of the sample. Slide the adjustable clamping and fixing assembly 63 on the right side to adjust it to a position suitable for the length of the mask sample. Tighten the insulating clamping screws 634 on the left and right sets of adjustable clamping and fixing assemblies 63 respectively. Press and fix the left and right ends of the mask sample by the insulating pressure plate 632. At the same time, the slider 633 can be slid and adjusted according to the width of the mask sample to adapt to different widths of masks, ensuring that the sample is laid flat without wrinkles or displacement. After the sample is clamped, flip the Faraday Cylinder Assembly 5 downwards to close it, so that its bottom is inserted into the positioning slot 8 to form a closed shielded test chamber.

[0054] Step 2, Parameter Presetting and Static Elimination: Preset test parameters through control panel 4, including the test rod spacing for overall charge quantity testing, the grid size for gridded scanning (e.g., 1cm×1cm), single-point test time, and the test distance between the test rod and the sample surface; after the parameters are set, start the device. Control unit 3 first controls the static elimination module to start, and performs residual static elimination inside the shielded test chamber. After elimination is completed, the static elimination module automatically shuts down.

[0055] Step 3, Overall Charge Measurement: After static electricity elimination, the control unit 3 controls the longitudinal electric linear slide 73 to move the overall charge measurement unit 77 to the center line of the mask sample's length direction. Then, according to the preset mask length parameters, the control unit 3 controls the drive motor 7731 to adjust the distance between the two sets of test rods A772 to match the length of the mask sample, aligning them with the left and right edges of the mask sample. Afterward, the control unit controls the electric push rod A72 to move the fixing plate 76 downward, so that the lower ends of the two sets of test rods A772 reliably contact the surface of the mask sample. The overall charge of the mask sample is quantitatively detected by an external high-precision electrostatic meter, and the detection data is transmitted to the control unit 3 in real time. After the overall charge measurement is completed, the electric push rod A72 drives the overall charge measurement unit 77 to reset and rise.

[0056] Step 4: In-plane electrostatic distribution gridding test: After the overall charge quantity test is completed, the control unit 3 controls the longitudinal electric linear slide 73 and the transverse electric linear slide 78 to move the electrostatic distribution test unit 79 above the first test point of the mask sample according to the preset gridding scanning parameters; then, the electric push rod B791 is controlled to move, causing the lifting plate 793 to move downward, so that the lower end of the test rod B794 contacts the surface of the mask sample, completing the electrostatic quantity detection at that point, and the detection data is transmitted to the control unit 3 in real time; after the single-point test is completed, the electric push rod B791 drives the test rod B794 to reset and rise, the longitudinal electric linear slide 73 and the transverse electric linear slide 78 are linked, and the electrostatic distribution test unit 79 moves to the next test point, repeating the above detection process until the electrostatic detection of all grid points in the mask sample is completed, realizing the full-area scanning of the in-plane electrostatic distribution.

[0057] Step 5, Data Output and Sample Retrieval: After the entire testing process is completed, the control unit 3 processes the collected overall charge data and gridded electrostatic distribution data, displays the test results in real time through the control panel 4, automatically generates an in-plane electrostatic distribution cloud map of the mask sample and a standardized test report, and simultaneously completes local storage of the test data; the operator can open the Faraday cylinder assembly 5 through the handle 52, loosen the insulating clamping screw 634, and take out the mask sample that has been tested to prepare for the next sample test.

[0058] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A device for detecting the charge quantity and electrostatic distribution of a nano-graphene medical mask, characterized in that: It includes a frame (1), a Faraday cylinder assembly (5), a sample fixing mechanism (6), a drive mechanism (7), an overall charge quantity testing unit (77), and an electrostatic distribution testing unit (79); The bottom of the frame (1) is provided with insulating rubber feet (2), the top left side of the frame (1) is provided with a Faraday cylinder assembly (5), the Faraday cylinder assembly (5) forms a shielded test cavity inside, and the top right side of the frame (1) is provided with a control unit (3). The sample fixing mechanism (6) is located on the top of the frame (1) and inside the shielded test chamber of the Faraday cylinder assembly (5). It includes an insulating support platform (61), a scale assembly (64), and two sets of adjustable clamping and fixing assemblies (63). The insulating support platform (61) is made of insulating acrylic sheet and is fixed on the frame (1). The scale assembly (64) is provided on the insulating support platform (61). Of the two sets of adjustable clamping and fixing assemblies (63), one set of adjustable clamping and fixing assemblies (63) is fixed on the left side of the insulating support platform (61), and the other set of adjustable clamping and fixing assemblies (63) is slidably located on the right side of the insulating support platform (61). The driving mechanism (7) is located on the upper side of the sample fixing mechanism (6) and inside the shielded test chamber of the Faraday cylinder assembly (5). It includes a fixed bracket (71), a longitudinal electric linear slide (73), and a transverse electric linear slide (78). The bottom of the fixed bracket (71) is fixed on the frame (1). The front top of the fixed bracket (71) is provided with a longitudinal electric linear slide (73) driven by a motor. A support plate (75) is fixedly connected to the slide seat (74) of the longitudinal electric linear slide (73). Two sets of electric push rods A (72) are symmetrically provided on the support plate (75). The lower end of the electric push rods A (72) is fixedly connected to the fixed plate (76). The bottom of the fixed plate (76) is fixedly provided with a transverse electric linear slide (78). The overall charge quantity testing unit (77) is horizontally positioned at the bottom of the fixed plate (76), and its overall horizontal electric linear slide (78) is parallel to it; the electrostatic distribution testing unit (79) is positioned on the slide (74) of the horizontal electric linear slide (78), and can be translated with the horizontal electric linear slide (78).

2. The device for detecting charge quantity and electrostatic distribution of nano-graphene medical masks according to claim 1, characterized in that: The rear bottom of the Faraday cylinder assembly (5) is hinged to the frame (1) by two sets of damping hinges (51), and the front side of the Faraday cylinder assembly (5) is provided with a handle (52); the frame (1) has a positioning slot (8) adapted to the bottom of the Faraday cylinder assembly (5), and the bottom of the Faraday cylinder assembly (5) is inserted into the positioning slot (8).

3. The device for detecting the charge quantity and electrostatic distribution of nano-graphene medical masks according to claim 2, characterized in that: The Faraday cylinder assembly (5) includes an inner cylinder (54) and an outer cylinder (53) formed by a double-layer square metal cover. The inner cylinder (54) and the outer cylinder (53) are insulated from each other. The outer cylinder (53) is grounded. The inner cylinder (54) and the outer cylinder (53) are fastened together to form a closed shielded test chamber. The bottom of the inner cylinder (54) and the outer cylinder (53) are insulatedly connected by an insulating base pad (55). The Faraday cylinder assembly (5) is also equipped with an electrostatic elimination module to eliminate residual static electricity in the shielded test chamber before testing.

4. The device for detecting charge quantity and electrostatic distribution of nano-graphene medical masks according to claim 1, characterized in that: The scale assembly (64) includes a length scale and a width scale set on an insulating support platform (61) for measuring the length and width of the mask. The length scale and the width scale are set vertically. A test positioning mark point (62) is set at the upper left corner of the insulating support platform (61). The starting ends of the length scale and the width scale are aligned with the test positioning mark point (62).

5. The device for detecting charge quantity and electrostatic distribution of nano-graphene medical masks according to claim 1, characterized in that: The adjustable clamping and fixing assembly (63) includes a beam frame (631), an insulating pressure plate (632), an adjusting slider (633), an adjusting groove (635), and two sets of adjustable insulating clamping screws (634). The beam frame (631) is provided with two sets of insulating clamping screws (634), and the bottom of each set of insulating clamping screws (634) is fixed with an insulating pressure plate (632) for pressing and fixing the mask sample along the width direction. One set of insulating clamping screws (634) is screwed to the beam frame (631), and the other set of insulating clamping screws (634) is screwed to the adjusting slider (633). The beam frame (631) is provided with an adjusting groove (635), and the adjusting slider (633) is slidably disposed in the adjusting groove (635).

6. The device for detecting charge quantity and electrostatic distribution of nano-graphene medical masks according to claim 5, characterized in that: The insulating support platform (61) has guide grooves (65) on both the front and rear sides of the right end. The beam frame (631) on the right adjustable clamping and fixing assembly (63) is slidably locked in the guide grooves (65) at both ends. The length adjustment range of the beam frame (631) on the right is 13.5-17.5cm.

7. The device for detecting charge quantity and electrostatic distribution of nano-graphene medical masks according to claim 1, characterized in that: The overall charge testing unit (77) includes a C-shaped slot frame (771), test rods A (772), a translation adjustment component (773), and a translation slide (774). The C-shaped slot frame (771) is fixed to the bottom of the fixed plate (76). The right end of the C-shaped slot is provided with a translation adjustment component (773). The bottom of the C-shaped slot corresponding to the translation adjustment component (773) is provided with a translation slide (774). The bottom of the C-shaped slot frame (771) is provided with two sets of test rods A (772). One set of test rods A (772) is fixed, and the upper end of the other set of test rods A (772) is fixedly connected to the translation adjustment component (773) and can be translated and adjusted with the translation adjustment component (773). The diameter of the test rods A (772) matches the diameter of the multimeter probe and the length is 17.5cm.

8. The device for detecting charge quantity and electrostatic distribution of nano-graphene medical masks according to claim 1, characterized in that: The electrostatic distribution test unit (79) includes an electric push rod B (791), a push rod fixing frame (792), a lifting plate (793), and a test rod B (794). The electric push rod B (791) is fixedly installed on the slide (74) of the transverse electric linear slide table (78) through the push rod fixing frame (792). The lower output end of the electric push rod B (791) is provided with a lifting plate (793). Two sets of test rods B (794) are symmetrically arranged at the bottom of the lifting plate (793). The length of the test rod B (794) is 1cm, the distance between adjacent test rods B (794) is 1cm, and the diameter of the test rod B (794) matches the diameter of the multimeter probe.

9. The device for detecting charge quantity and electrostatic distribution of nano-graphene medical masks according to claim 7, characterized in that: The translation adjustment assembly (773) includes a drive motor (7731), a threaded screw (7732), and a nut seat (7733). The threaded screw (7732) is mounted on the right end of the C-shaped slot frame (771) via a bearing seat. The right end of the threaded screw (7732) is connected to the output end of the drive motor (7731). The nut seat (7733) is mounted on the threaded screw (7732). The upper end of the test rod A (772) passes through the translation slide (774) and is fixedly connected to the bottom of the nut seat (7733).

10. The device for detecting the charge quantity and electrostatic distribution of a nano-graphene medical mask according to claim 1, characterized in that: The control unit (3) integrates a control panel (4). The control unit (3) is electrically connected to the longitudinal electric linear slide (73), the transverse electric linear slide (78), the overall charge quantity test unit (77), and the electrostatic distribution test unit (79), respectively. The control unit (3) has a built-in PLC control module, which can preset test parameters, control the action sequence of the test components, and collect, store, and display test data.

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