Medical mask anti-synthetic blood penetration tester and detection method

Abstract

The present invention discloses a medical mask synthetic blood penetration resistance tester and a testing method thereof. The tester comprises a base, a mask fixing device disposed on one side of the base, a spraying device disposed on the other side of the base, and an automatically retractable baffle disposed between the mask fixing device and the spraying device. The automatically retractable baffle controls the time and speed at which synthetic blood ejected from the spraying device reaches the mask fixing device. The present invention has the beneficial effect of: after the automatic baffle is used, when the spraying device valve is initially opened, due to the different frictional resistances of various device components, the new mask synthetic blood penetration resistance tester can block both the fast and slow liquid flow rates in the initial injection period, thereby ensuring that the synthetic blood ejected within the specified time is ejected at a set uniform speed, thereby improving the accuracy of the test results.

Description

Technical Field

[0001] The present invention relates to the technical field of mask detection, and in particular to a medical mask synthetic blood penetration resistance tester and a detection method thereof. Background Art

[0002] Currently, the commonly known synthetic blood penetration detector for face masks is designed according to the technical solution in YY / 0691-2008 / ISO22609:2004. When a certain volume of synthetic blood is horizontally injected onto a mask sample within a controlled time, the flow rate of the synthetic blood at the front end decreases due to friction when the valve is initially opened as it passes through the pipe, valve, and injection head. Therefore, the specified volume of synthetic blood cannot be uniformly ejected within the specified time. Although a positioning target (a flat plate with a 0.5 cm hole) is used to block the high-pressure stream of the injected liquid flow, the device cannot be used to detect the presence of synthetic blood in the face mask. However, during the test, it is very easy for the nozzle to have extremely slight position deviations and external forces, which may cause the 0.5 cm hole plate to block the qualified artificial synthetic blood, and ultimately the volume of artificial synthetic blood sprayed onto the mask is insufficient, resulting in deviations in the test results without the knowledge of the test personnel; and for the detection equipment that has no effect on the slow flow rate of the liquid in the initial injection time and the fast flow rate in the latter part of the injection time when the valve is just opened, the target speed of the liquid sprayed onto the mask is higher than the set value, which causes serious deviations in the test results without the knowledge of the test personnel. Summary of the Invention

[0003] In response to the problems existing in the prior art, the present invention provides a medical mask anti-synthetic blood penetration tester and its detection method, which evaluates the performance of medical masks in preventing synthetic blood penetration in a short period of time by spraying a certain volume of synthetic blood horizontally onto a mask sample at a uniform speed within a controlled time.

[0004] The technical solutions of the present invention are as follows:

[0005] The medical mask synthetic blood penetration tester is characterized in that it includes a base, a mask fixing device is provided on one side of the base, and a spray device is provided on the other side of the base. An automatically retractable baffle is provided between the mask fixing device and the spray device, and the time and speed at which the synthetic blood sprayed by the spray device reaches the mask fixing device are controlled by the automatically retractable baffle.

[0006] The medical mask anti-synthetic blood penetration tester is characterized in that the mask fixing device includes a first fixing plate, a second fixing plate, a mask support block, a first magnetic head, a second magnetic head and a handle, the first fixing plate is movably set on the base, the second fixing plate is fixed on the base, the mask support block is fixed on the inner side of the first fixing plate, the first magnetic head is set on the first fixing plate, the second magnetic head is set on the second fixing plate and corresponds to the position of the first magnetic head, and the handle is fixed on the outer side of the first fixing plate.

[0007] The medical mask anti-synthetic blood penetration tester is characterized in that the injection device includes an injection head and an injection head adjustment mechanism, the injection head adjustment mechanism includes an injection head fixing block, a connecting column, a fixing column and an adjustment block, one end of the connecting column is set on the injection head fixing block, and the other end is passed through the adjustment block, the fixing column is fixedly set on the base, and the adjustment block is passed through the fixing column, the adjustment block is provided with a first adjustment handle at a position corresponding to the fixing column, and the adjustment block is provided with a second adjustment handle at a position corresponding to the connecting column.

[0008] The medical mask synthetic blood penetration tester is characterized in that the automatic telescopic baffle includes a telescopic switch and a baffle fixedly arranged on the telescopic switch, the baffle includes a baffle body and a baffle fixing plate, and a hole is opened on the baffle body.

[0009] The medical mask synthetic blood penetration tester is characterized in that a baffle auxiliary device is provided on the base between the injection device and the automatic telescopic baffle and close to the position of the automatic telescopic baffle. The baffle auxiliary device includes a fixing plate and a sleeve. A through hole is provided on the fixing plate, and the sleeve is passed through the through hole. A locking screw is provided on the fixing plate at a position corresponding to the sleeve.

[0010] The medical mask synthetic blood penetration tester is characterized in that a positioning target device is provided on the base between the mask fixing device and the automatic telescopic baffle and close to the position of the mask fixing device. The positioning target device includes a positioning plate and a positioning target arranged on the positioning plate, and a small hole is opened at the center of the positioning target.

[0011] The medical mask synthetic blood penetration tester is characterized in that a shell is provided on the base, and an operation panel, a switch, a pressure gauge and an air supply regulator are provided on the shell; a liquid container, an air supply pipeline, a liquid supply pipeline, a first solenoid valve of the sight liquid tube, a second solenoid valve, a liquid distribution pipe and an air distribution pipe are provided inside the shell; and a liquid filling port is provided on the top of the shell.

[0012] The medical mask synthetic blood penetration resistance tester is characterized in that a guide post is provided below the telescopic switch, and the guide post is fixed on the baffle.

[0013] The medical mask synthetic blood penetration resistance tester is characterized in that a sight glass is provided on the liquid container.

[0014] The detection method of the medical mask synthetic blood penetration resistance tester is characterized by comprising the following steps:

[0015] 1) Fill the pre-prepared standard synthetic blood into the liquid container from the filling port;

[0016] 2) Fix the mask sample on the mask fixing device, 300mm±10mm away from the injection port of the injection device;

[0017] 3) Place the positioning target device 1 cm in front of the mask sample;

[0018] 4) Align the injection head with the center of the small hole of the target device;

[0019] 5) Set the specified test time, the time for the automatic retractable baffle to operate, and the pressure of the liquid container, and collect the mass or volume ejected within the specified test time after positioning the target device;

[0020] 6) Test under the liquid container pressure confirmed above.

[0021] The beneficial effects of the present invention are:

[0022] 1) After using the automatic baffle, when the valve of the injection device begins to open, due to the different friction resistance of various equipment components, this new mask anti-synthetic blood penetration detector can block both the fast liquid flow rate in the initial stage of the injection time and the slow liquid flow rate in the initial stage of the injection time, so that the artificial synthetic blood injected within the specified time is ejected at a set uniform speed level, thereby improving the accuracy of the test results.

[0023] 2) Since there is no need to locate the target to block the high-pressure stream of the sprayed liquid, the target hole is enlarged to 2cm-4cm, which increases the aperture by 4 to 8 times. The liquid flow rate can pass through 100%, and the sprayed liquid volume will not be lost due to extremely slight nozzle position deviation and external force, thereby improving the stability of the test results.

[0024] 3) Compared to the test methods in YY / T 0691-2008 and ISO 22609:2004, this method only requires collecting and measuring the mass of the liquid passing through the target hole directly behind the target. A value within ±2% of the specified injection mass satisfies the target velocity requirement. This eliminates the need for alignment with the 0.5cm aperture and repeated calibration and measurement of the liquid mass before and after the target, increasing inspection speed and reducing complex calibration steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an overall three-dimensional diagram of the present invention;

[0026] Figure 2 It is a schematic diagram of the front structure of the present invention;

[0027] Figure 3 It is a schematic diagram of the back structure of the present invention;

[0028] Figure 4 It is a schematic structural diagram of the injection device of the present invention;

[0029] Figure 5 Schematic diagram of the baffle structure of the present invention;

[0030] Figure 6 It is a structural schematic diagram of the baffle auxiliary device of the present invention;

[0031] Figure 7 It is the liquid and gas circuit connection diagram of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings.

[0033] like Figure 1-7 As shown in the figure, the medical mask synthetic blood penetration tester can block the unqualified liquid flow rate in the initial injection time by the automatic baffle for a certain period of time (0.5-2s), and then the automatic baffle opens. The detection equipment starts timing from the time the automatic baffle opens, ensuring that the liquid flow rate ejected from this time onwards is horizontally uniform.

[0034] The medical mask synthetic blood penetration tester includes a base 1, a mask fixing device 2 is provided on one side of the base 1, and a spray device 5 is provided on the other side of the base 1. An automatic telescopic baffle 10 is provided between the mask fixing device 2 and the spray device 5, and the time and speed at which the synthetic blood sprayed from the spray device 5 reaches the mask fixing device 2 are controlled by the automatic telescopic baffle 10.

[0035] The mask fixing device 2 includes a first fixing plate 201, a second fixing plate 203, a mask support block 202, a first magnetic head 205, a second magnetic head 204 and a handle 206. The first fixing plate 201 is arranged on the base 1 through a hinge, the second fixing plate 203 is fixed on the base 1, the mask support block 202 is fixedly arranged on the inner side of the first fixing plate 201, the first magnetic head 205 is arranged on the first fixing plate 201, the second magnetic head 204 is arranged on the second fixing plate 203 and corresponds to the position of the first magnetic head 205, the first magnetic head 205 and the second magnetic head 204 have opposite magnetic poles, and the handle 206 is fixedly arranged on the outer side of the first fixing plate 201. By opening the first fixing plate 201, putting the mask on the mask support block 202, and then closing the first fixing plate 201, the mask can be fixed at a position between the first fixing plate 201 and the second fixing plate 203.

[0036] The injection device 5 includes a spray head 501 and a spray head adjustment mechanism, which includes a spray head fixing block 502, a connecting column 507, a fixing column 505 and an adjustment block 503. One end of the connecting column 507 is set on the spray head fixing block 501, and the other end is passed through the adjustment block 503. The fixing column 505 is fixedly set on the base 1, and the adjustment block 503 is passed through the fixing column 505. A first adjustment handle 504 is provided on the adjustment block 503 at a position corresponding to the fixing column 505, and a second adjustment handle 506 is provided on the adjustment block 503 at a position corresponding to the connecting column 507. The vertical position and horizontal position of the spray head 501 can be adjusted by the first adjustment handle 504 and the second adjustment handle 506, so that the water sprayed from the spray head 501 can enter the positioning target device 3.

[0037] The automatically retractable baffle 10 is mounted on the housing 14 and includes a retractable switch 1005 and a baffle 1004 fixed to the retractable switch 1005. In this embodiment, the retractable switch 1005 uses a pneumatic cylinder, but an electromagnetic switch can also be used. The baffle 1004 includes a baffle body 1003 and a baffle fixing plate 1001. The baffle body 1003 is provided with a hole 1002. Below the retractable switch 1005, a guide post 22 is fixed to the baffle 1004. The guide post ensures the stability of the baffle 1004 during retraction and extension. The retractable switch 1005 moves horizontally, thereby driving the baffle 1004 to move horizontally.

[0038] A baffle auxiliary device 4 is provided on the base 1 between the injection device 5 and the automatic telescopic baffle 10 and close to the position of the automatic telescopic baffle 10. The baffle auxiliary device 4 includes a fixing plate 401 and a sleeve 402. The fixing plate 401 is provided with a through hole, and the sleeve 402 is provided on the through hole. A locking screw 403 is provided on the fixing plate 401 at a position corresponding to the sleeve 402. The water from the injection head 501 passes through the sleeve 402 to reach the baffle 1004. The baffle auxiliary device 4 can prevent water from splashing out and polluting the equipment; when the baffle 1004 is pushed out, the hole 1002 on it corresponds to the position of the sleeve 402, so that the liquid injected from the injection device 5 passes through the baffle auxiliary device 4 and the automatic telescopic baffle 10 to reach the mask fixing device 2.

[0039] A positioning target device 3 is provided on the base 1 between the mask fixing device 2 and the automatic telescopic baffle 10 and close to the position of the mask fixing device 2. The positioning target device 3 includes a positioning plate 301 and a positioning target 302 arranged on the positioning plate 301. A small hole is provided at the center of the positioning target 302. A 0.5 cm small hole is provided at the center of the positioning target 302 of the positioning target device 3, which is used to position and adjust the injection head 501 and block part of the liquid so that the liquid reaching the mask can reach the specified target liquid (generally about 2 ml). During the experiment of the present invention, since the liquid moves at a uniform speed, there is no need to set the positioning target 302 or the small hole in the positioning target 302 does not need to be set to 0.5 cm. It can be set to 2 cm-4 cm (i.e., the positioning target 302 is removed for experiment), which increases the aperture by 4 to 8 times, so that the liquid flow rate can pass through 100%.

[0040] An L-shaped housing 14 is fixedly mounted on the base 1. The housing 14 houses an operating panel 9, a switch 8, a pressure gauge 6, and an air supply regulator 7. Inside the housing 14, there are a liquid container 16, an air supply line 12, a liquid supply line, a sight glass 15, a first electromagnetic valve 20, a second electromagnetic valve 21, a liquid distribution pipe 18, and an air distribution pipe 19. The top of the housing 14 is provided with a liquid filling port 11. An outer cover 13 is also provided on the housing 14 via a hinge. Figure 7 As shown, after the gas comes out of the pressure pump, it is divided into three branches by the gas distribution pipe 19. The first branch is connected to the first solenoid valve 20, the first solenoid valve 20 is connected to the injection head of the injection device 5, the second branch is connected to the second solenoid valve 21, the second solenoid valve 21 is connected to the telescopic switch 1005 (cylinder), and the third branch is connected to the air supply regulator 7, which is connected to the pressure gauge 6; after the liquid comes out of the liquid container 16, it is divided into two branches by the liquid distribution pipe 18, the first branch is connected to the liquid container 16 to form the sight glass 15; the second branch is connected to the injection head of the injection device 5.

[0041] The method for testing the medical mask's resistance to synthetic blood penetration tester comprises the following steps:

[0042] 1) Fill the pre-prepared standard synthetic blood (density of standard synthetic blood is 1.005 g / mL) into the liquid container from the filling port;

[0043] 2) Fix the mask sample on the mask fixing device, 300mm±10mm away from the injection port of the injection device;

[0044] 3) Place the positioning target device 1 cm in front of the mask sample;

[0045] 4) Align the injection head with the center of the small hole of the positioning target device;

[0046] 5) Set the specified test time, and after positioning the target device, collect the mass or volume of the liquid sprayed during the specified test time, and adjust the air supply regulator (liquid container pressure) to match the mass or volume of the target liquid. The target liquid is sufficient if it meets the mass or volume of ±2%;

[0047] 6) Test under the liquid container pressure confirmed above.

[0048] The actual liquid injection speed is related to the volume of the injected liquid, the injection time, and the cross-sectional area of the nozzle. However, since the resistance of the valves, pipes, and injection heads of each device may not be completely consistent, the pressure of the liquid container of different devices will be different at the same speed. Table 1 shows the measured injection volume of synthetic blood of 2mL (2.01g), the test time (0.66s), and the cross-sectional area of the nozzle (0.0055cm 2 ) when recording the liquid container pressures of both the conventional and novel synthetic blood penetration testers. Using this pressure data, the test was performed at 0.5-second intervals. It was found that the conventional synthetic blood penetration tester exhibited a slow acceleration at the beginning, a rapid acceleration at the end, and then reached a stable, uniform speed. This was not the case when the synthetic blood was ejected at a constant speed of 550 cm / s. The present invention solves the problem of uneven ejection speed and maintains a stable velocity within ±2% of the required velocity, as shown in Table 2.

[0049] Table 1

[0050]

[0051] Table 2

[0052]

[0053]

[0054] According to the injection velocity formula in B.5 and the cross-sectional area formula of the circular nozzle in B.6 of YY / T0691-2008 / ISO 22609:2004, they are:

[0055] u=Q / (t×A), A=(π×d 2 ) / 4

[0056] Where:

[0057] u is the liquid velocity;

[0058] Q is the volume;

[0059] t is the injection time;

[0060] A is the nozzle cross-sectional area, = (3.1416 × 0.084 2 ) / 4=0.0055cm 2 ;

[0061] π=3.1416;

[0062] d=0.084cm.

[0063] The density of standard synthetic blood is 1.005g / mL, and the volume of 1.2g of synthetic blood is 1.206mL. Take 1.2mL, and the mass volume accuracy of the spray in the table below is 0.1. According to the above formula, the spray speed of the ordinary mask anti-synthetic blood penetration tester at 0.5s, 1s, 1.5s and 2s is:

[0064] u=1.2 / (0.5×0.0055)=436cm / s

[0065] u=(3.9-1.2) / (0.5×0.0055)=982cm / s

[0066] u=(6.6-3.9) / (0.5×0.0055)=982cm / s

[0067] u=(9.3-6.6) / (0.5×0.0055)=982cm / s

[0068] The speed of the new mask anti-synthetic blood penetration detector at 0.5s, 1s, 1.5s and 2s spray is:

[0069] u=1.52 / (0.5×0.0055)=553cm / s

[0070] u=(3.04-1.52) / (0.5×0.0055)=553cm / s

[0071] u=(4.56-3.04) / (0.5×0.0055)=553cm / s

[0072] u=(6.07-4.56) / (0.5×0.0055)=549cm / s.

Claims

1. Medical mask anti-synthetic blood penetration tester, characterized by: The invention comprises a base (1), a mask fixing device (2) is provided on one side of the base (1), a spraying device (5) is provided on the other side of the base (1), an automatic telescopic baffle (10) is provided between the mask fixing device (2) and the spraying device (5), and the time and speed of the synthetic blood sprayed by the spraying device (5) reaching the mask fixing device (2) are controlled by the automatic telescopic baffle (10), wherein the liquid flow rate is blocked by the automatic telescopic baffle for 0.5-2s; A positioning target device (3) is provided on the base (1) between the mask fixing device (2) and the automatic telescopic baffle (10) and close to the mask fixing device (2). The positioning target device (3) comprises a positioning plate (301) and a positioning target (302) provided on the positioning plate (301). A small hole is provided at the center of the positioning target (302); The aperture of the positioning target (302) is set to 2 cm-4 cm, i.e., the positioning target (302) is removed for experiment, which increases the aperture by 4 to 8 times, so that the liquid flow rate can pass through 100%; The automatic telescopic baffle (10) comprises a telescopic switch (1005) and a baffle (1004) fixedly arranged on the telescopic switch (1005); the baffle (1004) comprises a baffle body (1003) and a baffle fixing plate (1001); a hole (1002) is provided on the baffle body (1003); A baffle auxiliary device (4) is provided on the base (1) between the injection device (5) and the automatic telescopic baffle (10) and close to the automatic telescopic baffle (10). The baffle auxiliary device (4) comprises a fixing plate (401) and a sleeve (402). A through hole is provided on the fixing plate (401). The sleeve (402) is passed through the through hole. A locking screw (403) is provided on the fixing plate (401) at a position corresponding to the sleeve (402).

2. The medical mask synthetic blood penetration tester according to claim 1, characterized in that: The mask fixing device (2) comprises a first fixing plate (201), a second fixing plate (203), a mask support block (202), a first magnetic head (205), a second magnetic head (204) and a handle (206), wherein the first fixing plate (201) is movably arranged on the base (1), the second fixing plate (203) is fixed on the base (1), the mask support block (202) is fixedly arranged on the inner side of the first fixing plate (201), the first magnetic head (205) is arranged on the first fixing plate (201), the second magnetic head (204) is arranged on the second fixing plate (203) and corresponds to the position of the first magnetic head (205), and the handle (206) is fixedly arranged on the outer side of the first fixing plate (201).

3. The medical mask synthetic blood penetration tester according to claim 1, characterized in that: The injection device (5) comprises an injection head (501) and an injection head adjustment mechanism, wherein the injection head adjustment mechanism comprises an injection head fixing block (502), a connecting column (507), a fixing column (505) and an adjustment block (503), wherein one end of the connecting column (507) is arranged on the injection head fixing block (502), and the other end is passed through the adjustment block (503), the fixing column (505) is fixedly arranged on the base (1), and the adjustment block (503) is passed through the fixing column (505), a first adjustment handle (504) is provided on the adjustment block (503) at a position corresponding to the fixing column (505), and a second adjustment handle (506) is provided on the adjustment block (503) at a position corresponding to the connecting column (507).

4. The medical mask synthetic blood penetration tester according to claim 1, characterized in that: The base (1) is provided with a shell (14), an operation panel (9), a switch (8), a pressure gauge (6) and an air supply regulator (7) are provided on the shell (14), and a liquid container (16), an air supply pipeline (12), a liquid supply pipeline, a first solenoid valve (20), a second solenoid valve (21), a liquid distribution pipe (18) and an air distribution pipe (19) are provided inside the shell (14); and a liquid filling port (11) is provided on the top of the shell (14).

5. The medical mask synthetic blood penetration tester according to claim 1, characterized in that: A guide post (22) is provided below the telescopic switch (1005), and the guide post (22) is fixed on the baffle (1004).

6. The medical mask synthetic blood penetration resistance tester according to claim 4, characterized in that: The liquid container (16) is provided with a liquid sight tube (15).

7. The detection method of the medical mask synthetic blood penetration resistance tester according to any one of claims 1 to 6, characterized in that: The steps include: 1) Fill the pre-prepared standard synthetic blood into the liquid container from the filling port; 2) Fix the mask sample on the mask fixing device, 300mm±10mm away from the injection port of the injection device; 3) Place the positioning target device 1 cm in front of the mask sample; 4) Align the injection head with the center of the small hole of the positioning target device; 5) Set the specified test time, the time for the automatic retractable baffle to operate, and the pressure of the liquid container, and collect the mass or volume ejected within the specified test time after positioning the target device; 6) Test under the liquid container pressure confirmed above.

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