Device for measuring effective protection area of eye protector based on head model

Abstract

The utility model relates to a device for measuring an effective protection area of an eye protector, and the device comprises a head model which is used for the wearing of the eye protector and the evaluation of the effective protection area, and comprises a protection area mark; the spraying device comprises a nozzle, a pressure adjusting device and a solution containing cavity, the nozzle is used for spraying a solution, and the diameter of the nozzle is adjustable so that the distribution state of the solution on the eye protector can be changed; the pressure adjusting device is used for adjusting the injection pressure of the solution; and the solution accommodating cavity is used for accommodating a solution. By arranging the head mold and the eye protector marked with different protection areas, the effective protection area of the eye protector can be measured. By arranging the nozzle with the adjustable diameter, the distribution state of the solution on the eye protector or the head mold is changed, so that the measuring device can simulate various biological hazard scenes. The pressure adjusting device is combined with the nozzle for use, the actual spraying scene can be better fitted, and the effective protection area of the eye protector is further accurately measured.

Description

Technical Field

[0001] This application relates to the field of testing technology for personal protective equipment products, and specifically to a measuring device for the effective protective area of ​​eye protection. Background Technology

[0002] Eye protection refers to protective equipment (sometimes also called "goggles") that protects the eyes and face from injury, including safety glasses, goggles, and face shields. Eye protection is required in almost all hazardous workplaces. Protection against biological hazards is no exception, especially against pathogens carried by blood or bodily fluids; high-quality eye protection is therefore crucial in these situations. Currently, the measurement and evaluation of effective eye protection still suffers from several problems: it does not accurately reflect actual blood / body fluid spraying scenarios, and therefore cannot accurately test the effectiveness of eye protection. These problems include: 1. The spray solution is sprayed in a single horizontal direction without specifying the spray pressure or speed, which does not match the average human blood pressure and cannot simulate scenarios of small blood vessel rupture; it also fails to simulate biological hazard scenarios such as sneezing, coughing, punctures, saliva, or low-speed objects splashing from containers; 2. The sample is fixed on the device rather than worn on the head mold, which does not match the actual application scenario and cannot assess the fit between the eye protection and the head mold; 3. The wetting and penetrating properties of the spray solution do not match those of actual blood / body fluids, and it cannot simulate the characteristic parameters of blood. Utility Model Content

[0003] To address the aforementioned technical issues, this application provides a measuring device for the effective protection area of ​​eye protection, capable of simulating blood spray scenarios and scenarios of eye protection fitting snugly against the face, thereby accurately testing whether the eye protection can provide effective protection.

[0004] The technical solution adopted in this application to solve the above-mentioned technical problems is a measuring device for the effective protection area of ​​an eye protection device, comprising: a head mold for wearing the eye protection device and evaluating the effective protection area, the head mold including protection area markings; and a spraying device including a nozzle, a pressure regulating device, and a solution containing cavity, wherein the nozzle is used to spray a solution, the diameter of the nozzle is adjustable to change the distribution of the solution on the eye protection device; the pressure regulating device is used to adjust the spraying pressure of the solution; and the solution containing cavity is used to contain the solution.

[0005] In one embodiment of this application, the protective area markings are located on the face of the head model, and the multiple protective area markings correspond to multiple eye protection devices with different levels of protection.

[0006] In one embodiment of this application, the spraying device further includes a stroke adjustment knob, which is configured to precisely control the spray volume of the solution by changing the volume of the solution in the solution receiving cavity. In one embodiment of this application, the pressure regulating device includes a spray valve, which is a pneumatic valve. The pneumatic valve includes a first air inlet and a second air inlet. The first air inlet is used to open or close the pneumatic valve, and the second air inlet is used to spray the solution at a preset pressure and a preset speed.

[0007] In one embodiment of this application, the pressure regulating device further includes a gas source, a first gas delivery pipeline, and a second gas delivery pipeline. The gas source is connected to the first air inlet through the first gas delivery pipeline and to the second air inlet through the second gas delivery pipeline.

[0008] In one embodiment of this application, the spraying device further includes a stroke adjustment knob, which is configured to precisely control the spray volume of the solution by changing the volume of the solution in the solution containing cavity.

[0009] In one embodiment of this application, the pressure regulating device further includes a controller for controlling the opening or closing of the injection valve, adjusting the injection speed of the solution, and adjusting the injection volume of the solution.

[0010] In one embodiment of this application, the spraying device further includes a storage tank and a solution delivery pipeline. The storage tank is used to store the solution and the solution is delivered to the solution receiving cavity through the solution delivery pipeline.

[0011] In one embodiment of this application, the pressure regulating device includes an injection valve, which is a solenoid valve.

[0012] In one embodiment of this application, the measuring device further includes an adjustable platform and a rotating base. The adjustable platform is located below the head mold and is used to mount the head mold and adjust the pitch angle of the head mold. The rotating base is located below the adjustable platform and is used to mount the adjustable platform and adjust the horizontal rotation angle of the head mold.

[0013] In one embodiment of this application, the measuring device further includes a displacement stage located below the rotating base for mounting the base and for adjusting the position of the head mold.

[0014] This application utilizes a headmold, including protective area markings, for wearing eye protection, enabling accurate measurement of the effective protective area of ​​the eye protection. This headmold-based testing method is more scientific, reasonable, and effective, not only accurately measuring the effective protective area of ​​the eye protection but also evaluating the fit between the eye protection and the headmold. By using an adjustable-diameter nozzle to change the distribution of the solution on the eye protection, the measuring device of this application can simulate various biohazard scenarios. The pressure regulating device allows the measuring device to spray at a specific pressure or speed. The pressure regulating device, combined with the nozzle, more closely mimics actual spraying scenarios, further enhancing the accuracy of measuring the effective protective area of ​​the eye protection. Attached Figure Description

[0015] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings, wherein:

[0016] Figure 1 This is a block diagram of a measuring device according to an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of a Level I protection area marking according to an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of a Class II protection area marking according to an embodiment of this application;

[0019] Figure 4 This is a front view of a schematic diagram of a Level III protection area marking according to an embodiment of this application;

[0020] Figure 5 This is a side view of a schematic diagram of a Level III protection area marking according to an embodiment of this application;

[0021] Figure 6 This is a schematic diagram of a spraying device according to an embodiment of this application;

[0022] Figure 7 This is a schematic diagram of a spraying device according to another embodiment of this application;

[0023] Figure 8 This is a flowchart of a solution preparation method according to an embodiment of this application;

[0024] Figure 9 This is a flowchart illustrating the method of using a measuring device according to an embodiment of this application. Detailed Implementation

[0025] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein, and therefore this application is not limited to the specific embodiments disclosed below.

[0027] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not specifically singular and may include plural forms. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0028] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0029] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In addition, although the terminology used in this application is selected from commonly known and used terms, some terms mentioned in this application's specification may have been chosen by the applicant according to his or her judgment, and their detailed meanings are explained in the relevant sections of this description. Moreover, this application should be understood not only through the actual terms used, but also through the meaning implied by each term.

[0030] Hereinafter, embodiments of this application will be described based on the accompanying drawings. However, the embodiments shown below are examples of a measuring device for the effective protection area of ​​an eye protector used to embody the technical concept of this application, and the measuring device for the effective protection area of ​​the eye protector in this application is not specifically defined as follows. Furthermore, in order to facilitate understanding of the scope of the claims, the components shown in the "Claims" and "Utility Model Content" columns are assigned numbers corresponding to the components shown in the embodiments. However, the components shown in the claims are not intended to be specific to the components of the embodiments. In particular, the dimensions, materials, shapes, and relative arrangements of the constituent components described in the embodiments are not intended to limit the scope of this application unless specifically stated otherwise, but are merely illustrative examples.

[0031] However, the dimensions or positional relationships of the components shown in the accompanying drawings are sometimes exaggerated for clarity. Therefore, in the following description, detailed descriptions of the same names and symbols representing the same or homogeneous components are appropriately omitted. Furthermore, the elements constituting this application may be multiple elements composed of the same components, thus allowing one component to function as multiple elements; conversely, multiple components may share the function of one component. Additionally, the content described in some embodiments and implementations can be applied to other embodiments and implementations. Furthermore, in this specification, "upper" is not limited to the case of being formed in contact with an upper surface, but also includes the case of being formed separately on top, and also includes the meaning of an intermediate layer between layers.

[0032] The national standard for eye protection is GB 14866—2023, "General Technical Specification for Eye and Face Protective Equipment." This standard covers protection against common occupational hazards, such as physical and mechanical hazards and light radiation hazards like high-speed particle impact, ultraviolet radiation, corrosion, scratches, and high temperatures; however, it does not cover protection against biological hazards, such as protection against pathogens carried by blood or body fluids. It is well known that healthcare workers treating and caring for the injured or sick are highly susceptible to contact with biological fluids that can transmit diseases. If a patient's blood vessels are punctured, high-speed blood can spray onto the eyes and face of medical personnel, seriously threatening their lives and health. Therefore, eye protection is essential protective equipment not only for industrial workers but also for doctors, nurses, dental professionals, and other healthcare workers.

[0033] To address the deficiency in national standard GB 14866—2023 regarding biohazard protection, the National Technical Committee for Standardization of Medical Protective Equipment organized the drafting and formulation of industry standard YY / T1904—2023, "Medical Protective Eye (Face) Masks." This standard explicitly specifies technical requirements for biohazard protection against synthetic blood splashes, microbial limits, and ethylene oxide residues. Resistance to synthetic blood splashes simulates the situation in actual use where the mask comes into contact with a high-speed stream of blood ejected from a wound, serving as a crucial indicator for evaluating the synthetic blood penetration resistance of medical face masks. Essentially, it assesses whether eye protection can prevent blood or bodily fluids from splashing onto the face. When eye protection is worn on a headmist, the effective protection area on the headmist must be evaluated; different types of eye protection cover different areas. To ensure the safety of the wearer's eyes and face, eye protection is classified into three protection levels—Level I, Level II, and Level III—based on the type of biohazard it protects against. Level I protects only the eyes, Level II protects the eyes and mouth / nose, and Level III protects the entire face. Healthcare professionals can choose different types and sizes of eye protection based on various application scenarios and the areas and levels of facial protection required. Therefore, during testing and evaluation, the eye protection should be worn on a head model marked with the protected area. This head model-based testing method is more scientific, reasonable, and effective.

[0034] YY / T 1904—2023's test method for resistance to synthetic blood splashing references YY / T0691—2008, "Test Method for Resistance to Synthetic Blood Penetration of Medical Face Masks for Infectious Pathogen Protection (Fixed Volume, Horizontal Spray)". This test method involves horizontally spraying a fixed volume (2 ml) of synthetic blood at high speed (450 cm / s, 550 cm / s, and 635 cm / s) onto the surface of a medical face mask. The evaluation and judgment criterion is whether blood penetration occurs on the inner side of the medical face mask within a short time (0–2.5 s). However, YY / T0691—2008 also clearly states in its scope of application that this test method is only used to evaluate whether the face mask material itself is horizontally penetrated by liquid; it cannot assess the face mask structure or the fit between the face mask and the face. If the face mask structure is incomplete or does not fit the face properly, the high-speed sprayed blood can still enter the eyes, nose, mouth, and other organs of the medical personnel.

[0035] To evaluate the structural integrity and fit of medical goggles or face shields to the face, YY / T1904—2023, referencing the national standard GB / T 32166.2—2015 "Personal Protective Equipment - Eye and Face Protection - Occupational Eye and Face Protective Equipment - Part 2: Measurement Methods," specifies that medical goggles should provide droplet protection, and the inside of the goggles should not show staining. The specific test method is as follows: The sample to be tested is placed on a head mold wrapped in absorbent cotton cloth in its normal use position. Absorbent paper soaked in an indicator is placed between the absorbent cotton cloth and the sample. 5 mL to 10 mL of a 0.1 mol / L sodium carbonate solution is sprayed until the absorbing paper at the edge of the sample turns a uniform deep red. The sprayer is 600 mm away from the head mold, and spraying is performed from all directions. Then, the area within the two circles on the absorbing paper is checked for staining.

[0036] The "Test Method for Resistance to Synthetic Blood Penetration of Medical Face Masks (Fixed Volume, Horizontal Spray)" specified in YY / T 0691—2008 is compared and analyzed with the "Test Method for Anti-Drip Performance" specified in GB / T 32166.2—2015, as shown in Table 1.

[0037] Table 1 Comparison of test methods for resistance to synthetic blood penetration and droplet protection

[0038]

[0039]

[0040] The comparison in Table 1 reveals that both methods have their advantages and disadvantages. The synthetic blood penetration resistance method (YY / T0691—2008) can effectively simulate the speed of blood ejection by controlling pressure, but its disadvantages are also obvious: 1) The ejection is horizontal and unidirectional, which differs significantly from reality; 2) The sample is fixed to the sample fixing device with metal clips or plastic buckles, and is not worn on the head mold, which does not match the actual application scenario; this disadvantage also means that this method cannot be used to evaluate the fit between the mask and the head mold; 3) This method can only be used to evaluate mask products, and cannot evaluate eyeglasses and goggles.

[0041] The disadvantages of the anti-drip performance method (GB / T 32166.2—2015) are: 1) Although the sample is worn on the head mold and the liquid is sprayed in all directions, the method does not specify the spray pressure or speed, which is inconsistent with the average blood pressure of the human body (10.6~16.0kPa), resulting in the inability to simulate the scenario of rupture of small blood vessel openings; 2) The spray solution is a sodium carbonate solution, whose surface tension, viscosity and liquid polarity are inconsistent with the wetting and penetrating properties of blood, and cannot simulate the wetting and other characteristic parameters of blood; 3) This method can only be used to evaluate goggle products, and cannot evaluate eyeglasses and face mask products.

[0042] Furthermore, neither of the two methods listed in Table 1 simulates scenarios involving hazards such as sneezing, coughing, punctures, saliva, or low-speed objects splashing from containers.

[0043] To address the aforementioned issues, this application proposes a device for measuring the effective protective area of ​​eye protection. This device combines the advantages of the two methods described in Table 1, integrating them into one. Furthermore, it can replicate and simulate more biohazard scenarios, better matching the velocity, volume, and shape of sprayed liquids in different biohazard exposures. It can also assess the effective protective area of ​​various types of products, such as eyeglasses, goggles, and face shields, facilitating selection by healthcare professionals based on their needs.

[0044] Figure 1 A block diagram of a measuring device according to an embodiment of this application is shown. Figure 1 As shown, the measuring device 100 of this application includes: a head mold 110 for wearing eye protection and evaluating the effective protection area, the head mold 110 including protection area markings; and a spraying device 120 including a nozzle 121, a pressure regulating device 122 and a solution containing cavity 123, wherein the nozzle 121 is used to spray solution, the diameter of the nozzle 121 is adjustable to change the distribution of the solution on the eye protection; the pressure regulating device 122 is used to regulate the spraying pressure of the solution; and the solution containing cavity 123 is used to contain the solution.

[0045] By using a headmold designed for wearing eye protection, including markings for the protected area, the effective protected area of ​​the eye protection can be accurately measured. This headmold-based testing method is more scientific, reasonable, and effective, not only accurately measuring the effective protected area of ​​the eye protection but also evaluating the fit between the eye protection and the headmold. By using an adjustable-diameter nozzle to change the distribution of the solution on the eye protection, the measuring device of this application can simulate various biohazard scenarios. By incorporating a pressure regulating device, the measuring device of this application can spray at a specific pressure or speed. The pressure regulating device, combined with the use of the nozzle, further replicates actual spraying scenarios, leading to more accurate measurement of the effective protected area of ​​the eye protection.

[0046] In some embodiments, protective area markers are located on the face of the head model, and multiple protective area markers correspond to multiple eye protection devices with different levels of protection.

[0047] By marking multiple protective zones on the face of a head model, the effective protective area of ​​eye protection devices of different protection levels can be tested.

[0048] Figures 2-4 A schematic diagram of the protection zone markings for three protection levels is shown.

[0049] Figure 2 This is a schematic diagram of a Level I protection area marking according to an embodiment of this application. Figure 2 As shown, head model 210 includes markings 211a, 211b, 212a, 212b, an elliptical shaded area 213a, and an elliptical shaded area 213b. Markings 211a and 211b are in a star-shaped pattern. Marking 211a is located at the pupil position of the left eye of head model 210, and marking 211b is located at the pupil position of the right eye of head model 210. The distance 'a' between the centers of markings 211a and 211b represents the interpupillary distance. Marking 212a is the edge of elliptical shaded area 213a, and marking 212b is the edge of elliptical shaded area 213b. Elliptical shaded area 213a is the soft tissue area within the orbit of the left eye of head model 210, and elliptical shaded area 213b is the soft tissue area within the orbit of the right eye of head model 210. Elliptical shaded areas 213a and elliptical shaded areas 213b represent the minimum protection range that a Class I eye protection device should provide. In both elliptical shaded regions 213a and 213b, the major axis length is b, and the minor axis length is c. Figure 2 In the illustrated embodiment, a is 64mm, b is 35mm, and c is 22mm.

[0050] Figure 3 This is a schematic diagram of a Level II protection zone marking according to an embodiment of this application. Figure 3As shown, head model 310 includes markings 311a, 311b, 312a, 312b, and elliptical shaded areas 313a and 313b. Markings 311a and 311b are in a star-shaped pattern. Marking 311a is located at the pupil position of the left eye of head model 310, and marking 311b is located at the pupil position of the right eye. The distance a' between the centers of markings 311a and 311b represents the interpupillary distance. Marking 312a is the edge of elliptical shaded area 313a, and marking 312b is the edge of elliptical shaded area 313b. Elliptical shaded areas 313a and 313b represent the eye protection range that a Class II eye protector should provide. The major axis length of elliptical shaded areas 313a and 313b is b', and the minor axis length is c'. Figure 3 In the illustrated embodiment, a' is 64 mm, b' is 35 mm, and c' is 30 mm. Figure 3 As shown, the head model 310 also includes marker points G, H, J, K, L, and M, and a shaded area 314 formed by marker points G, H, J, K, L, and M. The shaded area 314 represents the mouth and nose protection area that a Class II eye protector should provide. Where f is the nose width (the length between vertices H and J); g is the distance from the tip of the nose to the pupil of the left eye or the pupil of the left eye; x is the distance between the straight line containing the centers of markers 311a and 311b (the straight line containing the centers of the left and right pupils) and the vertex M (or vertex L) of the mouth and nose protection area; z is the distance between the straight line containing the centers of markers 311a and 311b and the vertex G (or vertex K) of the mouth and nose protection area.

[0051] Figure 4 and Figure 5 This is a schematic diagram of a Level III protection zone marking according to an embodiment of this application. Figure 4 This is a front view of a schematic diagram of a Level III protection zone marking according to an embodiment of this application. Figure 5 This is a side view of a schematic diagram of a Level III protection zone marking according to an embodiment of this application. Figure 4 and Figure 5 As shown, the head model 410 includes markings 411a and 411b. Markings 411a and 411b are in a star-shaped pattern. Marking 411a is located at the pupil position of the left eye of the head model 410, and marking 411b is located at the pupil position of the right eye of the head model 410. The distance 'a' between the centers of markings 411a and 411b represents the interpupillary distance. Furthermore, Figure 4 The center of marker 411a also represents the corneal apex of the left eye of head model 410, and the center of marker 411b also represents the corneal apex of the right eye of head model 410. For example... Figure 4 and Figure 5As shown, the head model 410 also includes marker points A, B, C, D, E, and F, which form a shaded area 413. The shaded area 413 represents the protection range that a Class III eye protection device should provide. Figure 4 and Figure 5 As shown, b” is the distance from the straight line containing the centers of marks 411a and 411b (the straight line containing the centers of the left and right pupils) to the straight lines containing marks A and B; c” is the distance from the straight line containing the centers of marks 411a and 411b to the straight lines containing marks D and E; d is the distance from the straight line containing the centers of marks 411a and 411b to the straight lines containing marks C and F; e is the distance from the corneal apex 411b of the right eye to mark E; and f is the distance from the corneal apex 411b of the right eye to the straight lines containing marks A and F. Figure 4 and Figure 5 In the embodiment shown, a” is 64mm, b” is 43mm, c” is 99mm, d is 14mm, e is 16mm, and f is 26mm.

[0052] In some embodiments, marks 211a, 211b, 311a, 311b, 411a, and 411b may also use shapes other than the star shape as marks. In some embodiments, the marks or marking points described above can be engraved on the head mold to obtain the protective area represented by the shaded area. In some embodiments, the three levels of protective area marks can be set on the same head mold. Preferably, the three levels of protective area marks are set on three separate head molds.

[0053] In some embodiments, the nozzle 121 includes a mechanically adjustable nozzle, thereby making the nozzle diameter adjustable. For example, the nozzle 121 may have a retractable inner core designed inside, and the extension length of the inner core may be changed by rotating or pushing and pulling, thereby changing the actual diameter of the nozzle orifice. Alternatively, the nozzle 121 may be composed of multiple concentric sleeves, and the cross-sectional area of ​​the nozzle orifice may be changed by relatively moving the position of the sleeves.

[0054] By setting an adjustable nozzle 121, different application scenarios such as sneezing and blood vessel penetration can be accurately simulated. By changing the diameter of the nozzle 121, the distribution of the solution on the head mold or eye protection can be controlled to meet the needs of different scenarios, including scenarios with a large spray area, such as a sneezing scenario; or scenarios with a smaller spray range and more concentrated spray solution, such as a blood vessel penetration scenario. The nozzle tip diameter is 0.8±0.2mm.

[0055] Figure 6 A schematic diagram of a spraying device according to an embodiment of this application is shown. Figure 7 A schematic diagram of a spraying device according to another embodiment of this application is shown.

[0056] like Figure 6 and Figure 7 As shown, in some embodiments, the pressure regulating device 122 includes a spray valve, which is a pneumatic valve. The pneumatic valve includes a first air inlet 1221 and a second air inlet 1222. The first air inlet 1221 is used to open or close the pneumatic valve, and the second air inlet 1222 is used to spray the spray solution at a preset pressure and a preset speed.

[0057] In some embodiments, the pressure regulating device 122 includes an injection valve, which is a solenoid valve. For example... Figure 7 As shown, in some embodiments, the pressure regulating device 122 further includes a controller 1223 for controlling the opening or closing of the injection valve, regulating the injection speed of the solution, and regulating the injection volume of the solution. In some embodiments, the opening or closing of the injection valve can be controlled by adjusting the pressure of the gas entering the first air inlet 1221 of the pneumatic valve. In some embodiments, the injection speed of the solution can be set to a preset speed by adjusting the pressure of the gas entering the second air inlet 1222 of the pneumatic valve, and the injection volume of the solution can be set to a preset volume by adjusting the transmission time of the gas entering the second air inlet 1222 of the pneumatic valve. Preferably, when simulating a scenario with a large injection area, the injection pressure can be set to 45±5 kPa, the liquid ejection speed is approximately 500 cm / s, the solution injection time is 0.5±0.2 s, and the solution volume is 1 ml; preferably, when simulating a scenario with a relatively small injection range and a relatively concentrated injection solution, the injection pressure can be set to 58±5 kPa, the liquid ejection speed is approximately 635 cm / s, the solution injection time is 0.6±0.2 s, and the solution volume is 2 ml.

[0058] like Figure 7 As shown, in some embodiments, when the injection valve is a pneumatic valve, the pressure regulating device 122 further includes a gas source, a first gas delivery pipe 1224, and a second gas delivery pipe 1225. The gas source is connected to the first air inlet 1221 through the first gas delivery pipe 1224 and to the second air inlet 1222 through the second gas delivery pipe 1225. In some embodiments, the gas source is a high-pressure source. In some embodiments, the pressure regulating device 122 further includes an air compressor, and the pneumatic valve is connected to the air compressor so that the pneumatic valve can obtain pressure to allow the gas source to enter the first air inlet 1221 or the second air inlet 1222.

[0059] like Figure 6As shown, in some embodiments, the spraying device 120 further includes a stroke adjustment knob 124, which is configured to precisely control the spray volume of the solution by changing the volume of the solution in the solution receiving cavity 123. By setting the stroke adjustment knob 124, the volume of the sprayed liquid can be precisely controlled, and the solution in the cavity can be sprayed out in one spray, preventing excess liquid from flowing out at the end of the nozzle 121.

[0060] like Figure 7 As shown, in some embodiments, the spraying device 120 further includes a storage tank 125 and a solution delivery pipe 126. The storage tank 125 is used to store the solution and delivers the solution to the solution receiving cavity 123 through the solution delivery pipe 126. In some embodiments, the storage tank 125 is connected to an air compressor or high-pressure air source to allow the storage tank 125 to obtain pressure, thereby delivering the solution to the solution receiving cavity 123 through the solution delivery pipe 126. This application does not impose specific limitations on the material, volume, pressure, etc. of the storage tank 125. Preferably, the storage tank 125 is a sealed stainless steel storage tank, the volume of the storage tank 125 can be 1-51L, and the maximum pressure of the storage tank 125 does not exceed 1MPa.

[0061] like Figure 7 As shown, in some embodiments, the reservoir 125 is equipped with a pressure gauge 125a for displaying the internal pressure of the reservoir 125. In some embodiments, the measuring device 100 further includes an adjustable platform and a rotating base. The adjustable platform is located below the head mold for mounting the head mold and for adjusting the pitch angle of the head mold; the rotating base is located below the adjustable platform for mounting the adjustable platform and for adjusting the horizontal rotation angle of the head mold. In some embodiments, the adjustable platform can be adjusted 180° vertically in 15° increments. In some embodiments, the adjustable platform includes attached retaining pins that can position the adjustable platform in multiple positions. The adjustable platform includes mounting marks indicating the corresponding adjustment angle position and the pin position associated with each position. In some embodiments, the adjustable platform can also be fixed at any angle by tightening hexagonal locking screws. In some embodiments, the rotating base can rotate 360° about its vertical axis.

[0062] In some embodiments, the measuring device 100 further includes a displacement stage located below the rotating base for mounting the base and for adjusting the position of the head mold. In some embodiments, the displacement stage includes an electrically controlled linear displacement stage and a manually operated displacement stage. In some embodiments, the displacement stage can be continuously adjusted in the x and y directions, wherein the x and y directions are perpendicular to each other.

[0063] The following describes the method for preparing the solution in the measuring device 100 of this application to more accurately measure the effective protection area.

[0064] Figure 8 A flowchart illustrating a solution preparation method according to an embodiment of this application is shown. Figure 8 As shown, the solution is prepared according to the following steps:

[0065] Step S81: Pour approximately 2 / 3 volume of deionized water into a 1L volumetric flask;

[0066] Step S82: Add (9±1) g of NaCl to the volumetric flask and stir until completely dissolved;

[0067] Step S83: Add (0.75±0.01) g of sodium fluorescein to the volumetric flask and stir until completely dissolved;

[0068] Step S84: Add (1.0±0.1) ml of 2,4,7,9-tetramethyl-5-decyn-4,7-diol (chemical formula: C 14 H 26 Add O2 to the volumetric flask and stir until completely dispersed;

[0069] Step S85: Dilute the solution in the volumetric flask to 1.0 L with deionized water;

[0070] Step S86: Place the magnetic stirring rod into the volumetric flask;

[0071] Step S87: Transfer the volumetric flask to the magnetic stirrer, adjust the speed and set a timer of (30±1) min to ensure the solution is mixed evenly.

[0072] The existing solution is a sodium carbonate solution. The surface tension, viscosity, and liquid polarity of this solution do not match the wetting and penetration properties of blood. It cannot simulate the characteristic parameters of blood such as wetting and will flow into the protected area, thus making it impossible to accurately measure the effective protected area.

[0073] The solution prepared through the above steps has physical properties such as surface tension, viscosity, and polarity that are very similar to those of blood. Among them, C... 14 H 26 O2 is used to simulate blood viscosity, and sodium fluorescein has fluorescent properties. The solution prepared through the above steps can be used not only to measure the effective protection range of eye protection devices, but also to evaluate the resistance of medical masks to synthetic blood penetration. It can also be used to evaluate the compatibility between two or more products, such as eye protection devices and masks, for example, whether the two products fit together and whether they fit the face when medical personnel wear goggles and masks at the same time.

[0074] The method of using the measuring device 100 of this application will be described next. Figure 9 A flowchart illustrating a method of using a measuring device according to an embodiment of this application is shown. Figure 9As shown, a method of using the measuring device according to an embodiment of this application includes:

[0075] Step S91: Put the eye protection on the head mold including the protective area markings, adjust the head mold and nozzle to the preset positions, adjust the head mold and nozzle to the preset distance, and prepare the solution to simulate blood or body fluid.

[0076] Step S92: Spray the solution once each at angles of 30° downward, 30° upward, 55° to the left, and 55° to the right of the head mold.

[0077] Step S93: Remove the eye protection from the head model and observe whether the solution appears in the corresponding level of protection area of ​​the head model, thereby determining the effective protection area of ​​the eye protection.

[0078] By using the above-described measuring device, the effective protection area of ​​eye protection can be accurately measured using the measuring device 100.

[0079] In step S91, in some embodiments, the eye protection can be an eye mask or a face shield. In some embodiments, the head mold and nozzle are adjusted to a preset position and a preset distance by adjusting the adjustable platform, rotating base, or displacement stage. The preset position and preset distance can be set according to the actual testing environment and testing requirements. In some embodiments, the solution can be prepared using the above-described solution preparation method, or other conventional preparation methods can be used. The prepared solution can be stored in a sealed stainless steel storage tank.

[0080] In step S92, in some embodiments, the solution is controlled by a controller to be transported from a sealed stainless steel storage tank to a pneumatic valve via a second gas delivery pipeline, and the pressure, volume and distribution of the solution sprayed onto the head mold are controlled by the controller, the stroke adjustment knob and the diameter of the nozzle.

[0081] In step S93, in some embodiments, the solution prepared using the above solution preparation method contains a fluorescent substance, which allows for a clearer assessment of whether the solution appears within the corresponding level of protection area of ​​the head model under night vision conditions.

[0082] In some embodiments, the presence of the solution in the different protection zones of the head mold can be visually inspected, or the presence of the solution in the different protection zones of the head mold can be precisely tested using a device capable of testing fluorescent substances. In some embodiments, an imaging device can be used to acquire images of the head mold, and an analysis device can be used to analyze the images to achieve automated detection and determination of the effectiveness of the protection zones.

[0083] In some embodiments, when determining the effective protection area of ​​an eye protector, it is determined whether the corresponding protection area for that level has been exposed to solution. If the protection area for that level has not been exposed to solution, then the eye protector meets the protection standard for that level. For example, when testing whether an eye protector can meet the Level II protection standard, it is only necessary to determine whether solution is present in the Level II protection area. If droplets are present in the Level II protection area but not in the Level I protection area, then the eye protector does not meet the Level II protection standard and cannot be used as a Level II eye protector, but it can be used as a Level I eye protector.

[0084] By setting up a headmold for wearing eye protection, including markings for the protected area, the fit between the eye protection and the headmold can be evaluated, and the effective protected area of ​​the eye protection can be accurately measured. Through the coordination of the nozzle, pneumatic valve controller, and stroke adjustment knob, precise control of the solution's spray pressure, spray volume, and distribution on the eye protection is achieved. By setting up an adjustable platform, rotating base, and displacement stage, the headmold's pitch angle, horizontal rotation angle, and specific position can be adjusted according to actual testing needs. The solution prepared using the solution preparation method of this application can better simulate parameters of blood, body fluids, etc. Using the measuring device described in this application, the effective protected area of ​​the eye protection can be accurately measured.

[0085] While the foregoing disclosure has discussed various examples of utility model embodiments that are currently considered useful, it should be understood that such details are for illustrative purposes only, and the appended claims are not limited to the disclosed embodiments. Rather, the claims are intended to cover all modifications and equivalent combinations that conform to the spirit and scope of the embodiments of this application. For example, although the system components described above can be implemented by hardware devices, they can also be implemented solely by software solutions, such as installing the described system on existing servers or mobile devices.

[0086] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the utility model, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the present application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0087] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of scope in some embodiments of this application are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

Claims

1. A measuring device for the effective protection area of ​​an eye protector, characterized in that, include: A head model for wearing the eye protection and for assessing the effective protection area, the head model including protection area markings; as well as The spraying device includes a nozzle, a pressure regulating device, and a solution containing cavity, wherein the nozzle is used to spray a solution, and the diameter of the nozzle is adjustable to change the distribution of the solution on the eye protection. The pressure regulating device is used to regulate the injection pressure of the solution; and The solution-containing cavity is used to contain the solution.

2. The measuring device as described in claim 1, characterized in that, The protective area markings are located on the face of the head model, and multiple protective area markings correspond to multiple eye protection devices with different levels of protection.

3. The measuring device as described in claim 1, characterized in that, The spraying device also includes a stroke adjustment knob, which is configured to precisely control the spray volume of the solution by changing the volume of the solution in the solution containing cavity.

4. The measuring device as described in claim 1, characterized in that, The pressure regulating device includes a spray valve, which is a pneumatic valve. The pneumatic valve includes a first air inlet and a second air inlet. The first air inlet is used to open or close the pneumatic valve, and the second air inlet is used to spray the spray solution at a preset pressure and a preset speed.

5. The measuring device as described in claim 4, characterized in that, The pressure regulating device further includes a gas source, a first gas delivery pipeline, and a second gas delivery pipeline. The gas source is connected to the first air inlet through the first gas delivery pipeline and to the second air inlet through the second gas delivery pipeline.

6. The measuring device as described in claim 4, characterized in that, The pressure regulating device also includes a controller for controlling the opening or closing of the injection valve, adjusting the injection speed of the solution, and adjusting the injection volume of the solution.

7. The measuring device as described in claim 1, characterized in that, The spraying device also includes a storage tank and a solution delivery pipeline. The storage tank is used to store the solution, and the solution is delivered to the solution receiving cavity through the solution delivery pipeline.

8. The measuring device as described in claim 1, characterized in that, The pressure regulating device includes an injection valve, which is a solenoid valve.

9. The measuring device as claimed in claim 1, characterized in that, The measuring device further includes an adjustable platform and a rotating base. The adjustable platform is located below the head mold and is used to mount the head mold and adjust the pitch angle of the head mold. The rotating base is located below the adjustable platform and is used to mount the adjustable platform and adjust the horizontal rotation angle of the head mold.

10. The measuring device as described in claim 9, characterized in that, The measuring device also includes a displacement stage located below the rotating base for mounting the base and for adjusting the position of the head mold.

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