Mask fixing device for testing filtering efficiency of mask

Abstract

The utility model discloses a mask fixing device for testing the filtering efficiency of a mask, which comprises a test plate with a central hole, a disc-shaped mask piece chuck is arranged above the test plate, a through hole is formed in the center of the mask piece chuck, and a clamping groove for clamping the mask is formed in the side wall, corresponding to the through hole, of the mask piece chuck; a cylindrical sealing cover is movably clamped on the boss above the test plate, a plurality of vertically-penetrating pressing rods are arranged on the periphery of a central penetrating hole in the top of the sealing cover, and the upper ends of the pressing rods are fixedly connected with a circular-ring-shaped upper pressing disc located above the sealing cover. A mask material is clamped and fixed through the clamping groove of the mask piece clamping disc, the air outlet hopper of the mask filtering efficiency tester moves downwards to push the upper pressing disc, the pressing rod and the lower pressing disc to move downwards during an experiment, and under the action of pressure, the sealing gasket below the upper pressing disc achieves sealing between the upper pressing disc and the sealing cover, so that the sealing effect is good. The lower pressure plate extrudes the mask piece chuck to realize sealing between the mask material and the test plate, and the use is simple and convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to a mask filter test technical field, specifically is a kind of mask fixed device for mask filtration efficiency test. BACKGROUND

[0002] On mask packaging, we can see some letters and numbers, according to the authentication standard of our country, KN represents protection dust and other non-oily particulate matters, KP represents protection oily particulate matters and non-oily particulate matters, and the number represents the protection efficiency of particulate matter, and the larger the number is, the higher the protection efficiency is. Since different masks aim at different protection purposes, in order to intuitively verify the protection efficiency of different models of masks, mask penetration rate tester needs to be determined.

[0003] Mask penetration rate tester needs to be equipped with test plate and sealing cover when using, and in the prior art, mask material is fixed by glass glue, then sealing cover is buckled on the test plate on the instrument test table, the air outlet of the instrument is moved downward and pressed on the sealing cover, so that the airflow with particulate matter can be transported for experiment. After the test airflow with particulate matter passes through pipeline and the air outlet of the instrument, it passes through sealing cover, mask material and test plate downward, and by comparing the particulate matter concentration of downstream and upstream of mask material, filtration efficiency can be calculated.

[0004] Since mask material is fixed by glass glue, it is necessary to glue, wait for glass glue to solidify and clean glass glue on test plate after each experiment, because of long preparation time before experiment and troublesome cleaning after experiment, it brings inconvenience to use, and there are deficiencies. UTILITY MODEL CONTENT

[0005] In view of the deficiencies in the prior art, the utility model provides a mask fixed device for mask filtration efficiency test, to solve the problem that long preparation time before experiment, troublesome cleaning after experiment and inconvenience to use caused by fixing mask material by glass glue in the prior art.

[0006] To solve the above technical problems, the utility model provides the following technical scheme:

[0007] A mask fixed device for mask filtration efficiency test, comprising a centrally perforated test plate, a disc-shaped mask sheet chuck is placed above the test plate, a through hole is arranged in the center of the mask sheet chuck, a clamping groove for clamping a mask is arranged on the side wall of the mask sheet chuck corresponding to the through hole;

[0008] The cylindrical sealing cover is movably clamped on the convex platform above the test plate, a plurality of vertical penetrating pressure rods are arranged around the central perforation of the top of the sealing cover, the upper end of the pressure rod is fixedly connected with a circular annular upper pressing disc above the sealing cover, the lower surface of the upper pressing disc is fixedly connected with a sealing gasket, and the lower end of the pressure rod is fixedly connected with a circular annular lower pressing disc above the mask piece chuck.

[0009] A guide sleeve fixedly connected to the inner wall top of the sealing cover is sleeved on the surface of the pressure rod.

[0010] Preferably, the mask piece chuck and the sealing gasket are both disc-shaped soft silica gel gaskets.

[0011] Preferably, the upper surface and the lower surface of the mask piece chuck and the lower surface of the sealing gasket are all radially equidistantly provided with annular wire drawing grooves.

[0012] Preferably, the distance between the upper pressing disc and the sealing cover is equal to the distance between the lower pressing disc and the mask piece chuck.

[0013] Preferably, the pressure rod is a light rod and has three or four, and the pressure rod is circumferentially equidistantly arranged on the opposite surfaces of the upper pressing disc and the lower pressing disc.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model discloses a mask piece chuck and a sealing gasket are all disc-shaped soft silica gel gaskets. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the whole structure schematic view of the utility model;

[0017] Figure 2 It is the front view of the utility model;

[0018] Figure 3 It is the sealing gasket and pressure rod of the utility model and looks down on the view;

[0019] Figure 4 It is the mask piece chuck of the utility model and looks down on the view.

[0020] Fig. 1, test plate; 2, mask piece chuck; 21, through hole; 22, clamping groove; 3, sealing cover; 4, pressing rod; 5, upper pressing disc; 6, sealing washer; 7, lower pressing disc; 8, guide sleeve; 9, reset tension spring; 10, annular wire drawing groove. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0022] As Figures 1-4 shown, the utility model provides a kind of technical scheme: a kind of mask fixing device for mask filtration efficiency test, including the test plate 1 of central perforation, the disc-shaped mask piece chuck 2 of being placed in the upper of test plate 1, the central portion of mask piece chuck 2 is provided with through hole 21, the side wall of mask piece chuck 2 is provided with the clamping groove 22 for clamping mask corresponding through hole 21;

[0023] cylindrical sealing cover 3 is movably connected on the boss of test plate 1 upper, the top central perforation of sealing cover 3 is provided with multiple vertical penetration pressing rods 4, the upper end of pressing rod 4 is fixedly connected with the annular upper pressing disc 5 located in the upper of sealing cover 3, the lower surface of upper pressing disc 5 is fixedly connected with sealing washer 6, mask piece chuck 2 and sealing washer 6 are disc-shaped soft silica gel washer, the upper and lower surfaces of mask piece chuck 2 and the lower surface of sealing washer 6 are all provided with annular wire drawing groove 10 along radial equidistance;

[0024] the lower end of pressing rod 4 is fixedly connected with the annular lower pressing disc 7 located in the upper of mask piece chuck 2, the distance between upper pressing disc 5 and sealing cover 3 is equal to the distance between lower pressing disc 7 and mask piece chuck 2, pressing rod 4 is light pole and has three or four, pressing rod 4 is provided on the opposite surface of upper pressing disc 5 and lower pressing disc 7 along circumferential equidistance, the surface of pressing rod 4 is slidably connected with guide sleeve 8 fixedly connected in the top inner wall of sealing cover 3, reset tension spring 9 is installed between guide sleeve 8 and lower pressing rod 4.

[0025] Working principle:

[0026] During the experiment preparation, the mask material is clamped into the clamping groove 22 of the mask piece clamping disc 2, completely covering the central through hole 21, and the sealing cover 3 is buckled, the test plate 1 and the sealing cover 3 are placed on the experimental table of the mask filtration efficiency tester, and the upper pressing disc 5 is located directly below the air outlet, the air outlet of the mask filtration efficiency tester moves downward to extrude the upper pressing disc 5, and the pressing rod 4 and the lower pressing disc 7 are pushed to move downward, the sealing gasket 6 and the mask piece clamping disc 2 are flexible materials, the sealing gasket 6 is clamped and sealed by the upper pressing disc 5 and the sealing cover 3, the lower pressing disc 7 extrudes the mask piece clamping disc 2 to realize the sealing between the mask material and the test plate 1, and the air flow with particles can be conveyed for test experiment, the mask material does not need to be fixed and sealed by glass glue, and is convenient to disassemble and assemble, thereby bringing convenience to use.

[0027] It should be noted that in this document, such as the term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or equipment.

[0028] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A mask fixing device for testing the filtration efficiency of a mask, comprising a test plate (1) with a central perforation, characterized in that: A disc-shaped mask clip (2) is placed above the test plate (1). A through hole (21) is provided in the center of the mask clip (2). A clamping groove (22) for clamping the mask is provided on the side wall of the mask clip (2) corresponding to the through hole (21). A cylindrical sealing cover (3) is movably attached to the protrusion above the test plate (1). Multiple vertically penetrating pressure rods (4) are arranged around the central perforation at the top of the sealing cover (3). An annular upper pressure plate (5) located above the sealing cover (3) is fixedly connected to the upper end of the pressure rod (4). A sealing gasket (6) is fixedly connected to the lower surface of the upper pressure plate (5). An annular lower pressure plate (7) located above the mask clip plate (2) is fixedly connected to the lower end of the pressure rod (4). The surface of the pressure rod (4) is slidably sleeved with a guide sleeve (8) fixedly connected to the top of the inner wall of the sealing cover (3), and a reset spring (9) is installed between the guide sleeve (8) and the lower pressure rod (4).

2. The mask fixing device for testing mask filtration efficiency according to claim 1, characterized in that: The mask clip (2) and the sealing gasket (6) are both disc-shaped soft silicone gaskets.

3. The mask fixing device for testing mask filtration efficiency according to claim 1, characterized in that: The upper and lower surfaces of the mask clip (2) and the lower surface of the sealing gasket (6) are all provided with annular wire drawing grooves (10) at equal intervals along the radial direction.

4. The mask fixing device for testing mask filtration efficiency according to claim 1, characterized in that: The distance between the upper pressure plate (5) and the sealing cover (3) is equal to the distance between the lower pressure plate (7) and the mask clip plate (2).

5. The mask fixing device for testing mask filtration efficiency according to claim 1, characterized in that: The pressure rod (4) is a smooth rod and there are three or four rods. The pressure rod (4) is equidistantly arranged along the circumference on the opposite surfaces of the upper pressure plate (5) and the lower pressure plate (7).

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