Mask filtering efficiency detection equipment

Abstract

The invention relates to the technical field of mask detection, and discloses mask filtering efficiency detection equipment which comprises a detection equipment body used for detecting mask filtering efficiency, an electric push rod is adopted to drive a sliding plate to slide, a first pull rope and a second pull rope are synchronously pulled, and the pull ropes drive a U-shaped plate of a compensation part to slide after being limited by a first fixed pulley and a second fixed pulley. Meanwhile, tension generated by different thicknesses of the masks can enable the bottom ends of the outer sleeve arms to turn outwards, the tension generated when the masks with different thicknesses are unfolded is improved, the tension is buffered, the masks are prevented from being torn and damaged, it is ensured that the masks are smoothly unfolded and stretched, and wrinkles and cloth cover overlapping generated by pressing during detection are avoided; clamping teeth of an upper clamping nozzle and a lower clamping nozzle of the compensation part are arranged in a staggered mode, one corner of the mask can be better gripped, the clamping stability is improved, meanwhile, the structure is matched with a torsional spring, tension can be adjusted according to the thickness of the mask, tension compensation is conducted in real time, and the clamping requirements of masks of different models are met.

Description

Technical Field

[0001] The present invention relates to the technical field of mask detection, and in particular to a mask filtration efficiency detection device. Background Art

[0002] In today's society, masks have become an indispensable protective device in people's daily lives and many workplaces. With the increasing prominence of environmental pollution, harmful substances such as particulate matter, bacteria, and viruses in the air pose a serious threat to human health. To ensure that masks can provide effective protection, their filtration efficiency has become a key indicator of mask quality.

[0003] According to Chinese patent publication number CN213245455U, the patent provides a fixture for testing the filtration efficiency of masks and filter materials, including an upper transition fixture and a lower transition fixture. The upper transition fixture and the lower transition fixture are provided with grooves or through holes that are compatible with the mask to be tested. The edge of the mask to be tested after unfolding is in contact with the pressing surfaces of the upper transition fixture and the lower transition fixture, and the mask to be tested is sunken into the upper transition fixture or the lower transition fixture. Pressing bosses are provided on the upper transition fixture and the lower transition fixture, which not only helps to quickly place the mask to be tested in the specified position, but also enables the pressing force between the upper transition fixture and the lower transition fixture to be concentrated on the edge of the mask to be tested, so that the edge of the mask to be tested is sealed with the pressing bosses on the upper transition fixture and the lower transition fixture.

[0004] Due to the varying thicknesses of masks of different models, insufficient tension during the clamping process can easily lead to wrinkles and overlap during the press-fit test, affecting the filtration results. Therefore, a mask filtration efficiency test device is proposed to address the aforementioned issues. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In response to the shortcomings of the existing technology, the present invention provides a mask filtration efficiency testing device, which solves the problems of wrinkles and fabric overlap during the pressing test of the mask.

[0007] (2) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a mask filtration efficiency detection device, comprising a detection device body for detecting the filtration efficiency of the mask, a mounting portion mounted on a workbench of the detection device body for mounting a mask clamping tool, a blanking portion mounted on the mounting portion for automatically blanking the mask after the filtration detection is completed, a compensation portion mounted on the mounting portion for clamping the mask and performing tension compensation on the clamped mask, and a stretching portion mounted on the front side of the mounting portion for synchronously stretching the four corners of the mask for unfolding

[0009] Preferably, the mounting portion includes a mounting frame, which is mounted on a workbench of the detection equipment body, with sliding frames fixedly connected to the four corners of the outer wall of the mounting frame, a support frame fixedly connected to the front of the outer wall of the mounting frame, a button switch installed on the front of the outer wall of the support frame, a rope hole one is opened on the outer wall of each of the sliding frames, two rope holes two are symmetrically opened on the back of the outer wall of the mounting frame, and two rope holes three and two rope holes four are symmetrically opened on the front of the outer wall of the mounting frame.

[0010] Preferably, one side of the outer wall of each of the two sliding frames is equipped with a fixed pulley 1, and the two fixed pulleys 1 are symmetrically arranged with each other; and one side of the outer wall of each of the other two sliding frames is equipped with a fixed pulley 2, and the two fixed pulleys 2 are symmetrically arranged with each other.

[0011] Preferably, the blanking part includes two connecting pieces, the two connecting pieces are fixedly connected to a corner of the top of the mounting frame, a rotating rod is rotatably connected between the two connecting pieces through a torsion spring, the two ends of the rotating rod respectively moveably pass through the two connecting pieces, and a blanking arm is fixedly sleeved on the two passing ends of the rotating rod, and locking arms are rotatably connected to both sides of the sliding frame through a torsion spring, and a paddle is fixedly connected between the two locking arms.

[0012] Preferably, there are four blanking parts, which are respectively installed at the four corners of the top of the mounting frame. The four blanking parts are also respectively installed on four sliding frames, and each two locking arms are respectively clamped between their corresponding two blanking arms.

[0013] Preferably, the compensation part includes a U-shaped plate, which is slidably connected to the inner wall of the sliding frame, and a spring is elastically connected between the outer wall of the U-shaped plate and the inner wall of the sliding frame, and the outer wall of the U-shaped plate is fixedly connected to a push plate, and the inner wall of the U-shaped plate is rotatably connected to the outer arm through a torsion spring, and the inner wall of the outer arm is slidably connected to the inner sliding arm, and a tension spring is elastically connected between the bottom end of the inner sliding arm and the inner wall of the outer arm, and push arms are fixedly connected to both sides of the top of the inner sliding arm, and the top of the inner sliding arm is fixedly connected to an upper clamping nozzle, and the outer wall of the top of the outer arm is fixedly connected to a lower clamping nozzle, and the clamping teeth of the upper clamping nozzle and the lower clamping nozzle are staggered.

[0014] Preferably, there are four compensation parts, which are respectively mounted on the inner walls of four sliding frames, and each push piece is aligned with its adjacent paddle.

[0015] Preferably, the sliding frames where the two fixed pulleys 1 are located are each provided with a pull rope 1, one end of the two pull ropes 1 are respectively fixedly connected to the outer wall of the U-shaped plate adjacent thereto, and the other ends of the two pull ropes 1 slide through the corresponding rope hole 1, rope hole 2 and rope hole 3 respectively, and the sliding frames where the two fixed pulleys 2 are located are each provided with a pull rope 2, one end of the two pull ropes 2 are respectively fixedly connected to the outer wall of the U-shaped plate adjacent thereto, and the other ends of the two pull ropes 2 slide through the two sides of the mounting frame and the rope hole 4 respectively.

[0016] Preferably, the two pull ropes 1 are respectively wound around the adjacent fixed pulley 1, and the two pull ropes 1 also pass around the outer wall of the detection port on the workbench of the detection equipment body, and the two pull ropes 2 are respectively wound around the adjacent fixed pulley 2.

[0017] Preferably, the stretching part includes an electric push rod, which is installed on the inner wall of the support frame. A slide is slidably connected between the inner walls of the support frame. The slide is fixedly connected to the through ends of two pull ropes one and two pull ropes two, and a grip is fixedly connected to the front of the slide.

[0018] (3) Beneficial effects

[0019] Compared with the prior art, the present invention provides a mask filtration efficiency detection device with the following features:

[0020] Beneficial effects:

[0021] 1. The mask filtration efficiency testing equipment uses an electric push rod to drive the slide to slide, synchronously pulling the pull rope 1 and the pull rope 2. After being limited by the fixed pulley 1 and the fixed pulley 2, the pull rope drives the U-shaped plate of the compensation part to slide, so that the distance between the four U-shaped plates becomes larger to unfold the mask. At the same time, the tension generated by the different mask thicknesses will cause the bottom end of the outer arm to flip outward, increase the tension when unfolding masks of different thicknesses and buffer the tension to avoid tearing and damage of the mask, ensure the smooth unfolding and stretching of the mask, avoid wrinkles and overlap of the cloth surface during pressing during testing, improve the filtration quality and detection accuracy, the upper clamping mouth and the lower clamping mouth of the compensation part are staggered, which can better bite a corner of the mask and improve the clamping stability. At the same time, its structure cooperates with the torsion spring to adjust the tension according to the thickness of the mask and perform tension compensation in real time, adapting to the clamping requirements of different types of masks.

[0022] 2. The mask filtration efficiency testing equipment uses a pneumatic clamp to lower and press the mask. The U-shaped plate continues to slide to make the push piece and the paddle contact and squeeze. The paddle drives the locking arm to flip, and the unloading arm loses the clamping and flips upward to reset. It presses against the push arm to release the upper and lower clamps, automatically releasing the clamping of the four corners of the mask to achieve automatic unloading.

[0023] 3. The mask filtration efficiency testing equipment is installed on the workbench of the testing equipment body using the installation frame of the installation part. The sliding frame, support frame, button switch and other structures on the outer wall facilitate the installation of the mask clamping tool. The rope hole on each sliding frame and the rope hole two, rope hole three and rope hole four on the installation frame provide convenience for the setting of the pull rope, and the hole mouth adopts a smooth surface transition to reduce the wear of the pull rope and increase the service life of the pull rope. The stretching part has both an electric push rod to automatically pull the pull rope and a grip rod to manually pull the pull rope, which further improves the adjustment flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an overall axial view of a mask filtration efficiency testing device proposed by the present invention;

[0025] Figure 2 This is a connection diagram of the installation part, the blanking part and the compensation part of the mask filtration efficiency detection equipment proposed by the present invention;

[0026] Figure 3 This is a structural schematic diagram of the installation part of a mask filtration efficiency detection device proposed by the present invention;

[0027] Figure 4 This is a structural schematic diagram of the blanking part of a mask filtration efficiency testing device proposed by the present invention;

[0028] Figure 5 This is an axial view of the compensation part of a mask filtration efficiency testing device proposed by the present invention;

[0029] Figure 6 This is another side axial view of the compensation part of the mask filtration efficiency testing device proposed by the present invention;

[0030] Figure 7 This is a connection diagram of the compensation part, fixed pulley 1, and pull rope 1 of a mask filtration efficiency detection device proposed by the present invention;

[0031] Figure 8 This is a connection diagram of the compensation part, fixed pulley 2, and pull rope 2 of a mask filtration efficiency detection device proposed by the present invention;

[0032] Figure 9 This is a connection diagram of the stretching part and drawstrings 1 and 2 of a mask filtration efficiency testing device proposed by the present invention.

[0033] In the figure: 1. Detection equipment body; 2. Mounting part; 21. Mounting frame; 22. Sliding frame; 23. Support frame; 24. Push button switch; 25. Rope hole one; 26. Rope hole two; 27. Rope hole three; 28. Rope hole four; 3. Fixed pulley one; 4. Fixed pulley two; 5. Unloading part; 51. Connecting piece; 52. Rotating rod; 53. Unloading arm; 54. Locking arm; 55. Pick; 6. Compensating part; 61. U-shaped plate; 62. Spring; 63. Push piece; 64. Outer arm; 65. Inner sliding arm; 66. Push arm; 67. Upper clamping mouth; 68. Lower clamping mouth; 7. Pull rope one; 8. Pull rope two; 9. Stretching part; 91. Electric push rod; 92. Slide plate; 93. Grip. DETAILED DESCRIPTION

[0034] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] See also Figure 1-9 The present invention provides a technical solution: a mask filtration efficiency testing device, including a testing device body 1 for testing the mask filtration efficiency. The testing device body 1 adopts a mask efficiency tester model KZ-8130Pro, which fully meets the requirements of the national standard "GB19083-2010 Technical Requirements for Medical Protective Masks" and can accurately measure the particle filtration efficiency of masks, meltblown cloths and other filter materials. The mounting part 2 of this case is installed on the workbench of the testing device body 1 and is used for installing the mask clamping tool. The blanking part 5 of this case is installed on the mounting part 2 and is used for automatic blanking after the mask filtration test is completed. The compensation part 6 of this case is installed on the mounting part 2 and is used to clamp the mask and perform tension compensation on the clamped mask. The stretching part 9 of this case is installed on the front side of the mounting part 2 and is used to synchronously stretch the four corners of the mask for unfolding.

[0036] The front of the outer wall of the support frame 23 is fixedly connected to the sliding frame 22, and the front of the outer wall of the support frame 23 is fixedly connected to the sliding frame 22. The button switch 24 is installed on the front of the outer wall of the support frame 23. Each sliding frame 22 has a rope hole 25 on its outer wall. Two rope holes 26 are symmetrically provided on the back of the outer wall of the mounting frame 21, and two rope holes 3 27 and two rope holes 4 28 are symmetrically provided on the front of the outer wall of the mounting frame 21. Each hole adopts a smooth surface transition to reduce the wear of the pull rope and increase the service life of the pull rope. One side of the outer wall of the two sliding frames 22 is installed with a fixed pulley 3, and the two fixed pulleys 3 are symmetrically arranged with each other. The other side of the outer wall of the two sliding frames 22 is installed with a fixed pulley 24, and the two fixed pulleys 24 are symmetrically arranged with each other. The fixed pulley 1 3 and the fixed pulley 2 4 are used to guide and limit the sliding of the pull rope to prevent the pull rope from being misplaced and stuck.

[0037] In order to automatically remove the mask from the fixture after the mask filtration test is completed, the blanking part 5 of this case includes two connecting pieces 51, the two connecting pieces 51 are fixedly connected to the top corner of the mounting frame 21, and a rotating rod 52 is connected between the two connecting pieces 51 through a torsion spring. The torsion spring always provides a force for the rotating rod 52 to flip upward. The two ends of the rotating rod 52 are respectively movable through the two connecting pieces 51, and the two through ends of the rotating rod 52 are fixedly sleeved with a blanking arm 53. Both sides of the sliding frame 22 are rotatably connected to a locking arm through a torsion spring. 54, the torsion spring always provides the force for the locking arm 54 to flip downward, and a paddle 55 is fixedly connected between the two locking arms 54. In this case, there are four blanking parts 5, and the four blanking parts 5 are respectively installed at the four corners of the top of the mounting frame 21. The four blanking parts 5 are also respectively installed on the four sliding frames 22. Every two locking arms 54 are respectively clamped between their corresponding two blanking arms 53, and the upward and downward flipping force is generated by the torsion spring, thereby maintaining the balance after the blanking arm 53 and the locking arm 54 are clamped, and the problem of springing off is not caused.

[0038] In this embodiment, in order to better clamp different types of masks and increase the tension of the masks during clamping, the compensation part 6 of this case includes a U-shaped plate 61, which is slidably connected to the inner wall of the sliding frame 22, and a spring 62 is elastically connected between the outer wall of the U-shaped plate 61 and the inner wall of the sliding frame 22. The outer wall of the U-shaped plate 61 is fixedly connected to a push piece 63, and the inner wall of the U-shaped plate 61 is rotatably connected to the outer arm 64 through a torsion spring. The inner wall of the outer arm 64 is slidably connected to an inner sliding arm 65, and a tension spring is elastically connected between the bottom end of the inner sliding arm 65 and the inner wall of the outer arm 64. The tension spring always pulls the inner sliding arm 65 downward along the inner wall of the outer arm 64, and the inner sliding arm 65 is fixedly connected to the outer wall of the outer arm 64. The top sides of the arm 65 are fixedly connected with push arms 66, the top of the inner sliding arm 65 is fixedly connected with an upper clamping nozzle 67, and the outer wall of the top of the outer arm 64 is fixedly connected with a lower clamping nozzle 68. The clamping teeth of the upper clamping nozzle 67 and the lower clamping nozzle 68 are staggered. The staggered clamping can better bite a corner of the mask, thereby improving the clamping stability. There are four compensation parts 6 in this case, and the four compensation parts 6 are respectively installed on the inner walls of the four sliding frames 22. Each push piece 63 is aligned with its adjacent paddle 55. When the push piece 63 approaches the paddle 55, it can drive the locking arm 54 to flip through the paddle 55, thereby releasing the locking arm 54 from the discharge arm 53.

[0039] It is worth noting that in order to enable each compensation part 6 to be adjusted synchronously, a pull rope 7 is provided in the sliding frame 22 where the two fixed pulleys 3 are located in this case, one end of the two pull ropes 7 is fixedly connected to the outer wall of the U-shaped plate 61 adjacent to it, and the other ends of the two pull ropes 7 slide through the corresponding rope hole 1 25, rope hole 2 26 and rope hole 3 27 respectively, and a pull rope 2 8 is provided in the sliding frame 22 where the two fixed pulleys 2 4 are located, one end of the two pull ropes 2 8 is fixedly connected to the outer wall of the U-shaped plate 61 adjacent to it, and the other ends of the two pull ropes 2 8 slide through the two sides of the mounting frame 21 and the rope hole 4 28 respectively, and the two pull ropes 7 are respectively wound around the fixed pulley 3 adjacent to it, and the two pull ropes 7 also pass around the outer wall of the detection port on the workbench of the detection equipment body 1. The curved surface of the outer wall of the detection port can increase the tension of the pull rope 7 to prevent the pull rope 7 from shaking, and the two pull ropes 2 8 are respectively wound around the fixed pulley 2 4 adjacent to it.

[0040] It is worth noting that in order to further improve the adjustment flexibility, the stretching part 9 in this case includes an electric push rod 91, which is installed on the inner wall of the support frame 23. The electric push rod 91 is electrically connected to the button switch 24. A slide plate 92 is slidably connected between the inner walls of the support frame 23. The slide plate 92 is fixedly connected to the through ends of the two pull ropes 1 7 and the through ends of the two pull ropes 2 8. The pull ropes 1 7 and 2 8 are automatically pulled by the electric push rod 91. A grip 93 is fixedly connected to the front of the slide plate 92, and the pull ropes 1 7 and 2 8 can be manually pulled by the grip 93.

[0041] Working principle: the four corners of the mask are correspondingly set on the four compensation parts 6, and the inner sliding arm 65 is tightened by the elasticity of the tension spring. At this time, each upper clamping mouth 67 and the corresponding lower clamping mouth 68 bite a corner of the mask, thereby completing the clamping. The electric push rod 91 is started by the button switch 24, prompting the electric push rod 91 to drive the slide plate 92 to slide, thereby synchronously pulling the pull rope 1 7 and the pull rope 2 8. The pull rope 1 7 is limited by the fixed pulley 1 3 and slides through the rope hole 1 25, the rope hole 26, and the rope hole 3 27, while driving the connected U-shaped plate 61 to slide along the slide frame 22. At the same time, the pull rope 28 is limited by the fixed pulley 24 and drives the connected U-shaped plate 61 to slide through the rope hole 4, causing the four U-shaped plates 61 to slide synchronously and squeeze the spring 62 at the same time. At this time, the distance between the four U-shaped plates 61 becomes larger, thereby unfolding the mask. The tension generated by the different mask thicknesses is affected by the torsion spring on the outer arm 64, and then the bottom end of the outer arm 64 is flipped outward toward the U-shaped plate 61 with the torsion spring as the axis. On the one hand, it increases the tension when unfolding masks of different thicknesses, and on the other hand, it can also buffer the tension to prevent the mask from being torn and damaged.

[0042] At this time, the pneumatic clamp on the workbench of the detection equipment body 1 is lowered, and the mask is pressed against the detection port from the middle of the mask to perform filtration efficiency testing. While the pneumatic clamp is lowered to apply pressure to the mask, the torsion spring on the outer arm 64 still provides a buffering capacity to prevent the mask from being torn and damaged, further ensuring the tension of the mask while improving safety. Therefore, when facing different types of masks, it can ensure the smooth expansion and stretching of the mask, avoid the problem of wrinkles and overlapping of the cloth caused by pressing during testing, and improve the filtration quality and detection accuracy.

[0043] After the mask is detached, the outer arm 64 loses the tension and will be reset by the torsion spring to flip to the inner wall of the U-shaped plate 61 to restore verticality. When the inspection is completed, the pneumatic clamp is away from the mask, and the mask is in a non-clamped state, achieving the effect of automatic unloading.

[0044] After the electric push rod 91 is reset, the elastic force of the spring 62 will push the U-shaped plate 61 to slide and reset along the inner wall of the sliding frame 22, and prompt the outer arm 64 to rest against the outer wall of the mounting frame 21 to prevent the outer arm 64 from shaking during subsequent loading. At the same time, the U-shaped plate 61 will synchronously pull the connected pull rope 1 7 and pull rope 2 8 to reset, and the slide plate 92 will fit the front of the outer wall of the mounting frame 21 again. At this time, the inspector will remove the mask after inspection and print the inspection data ticket through the inspection equipment body 1, and re-lift the locking arm 54 through the paddle 55, and then press the discharge arm 53, so that the discharge arm 53 returns to the bottom of the locking arm 54, thereby completing the clamping of the locking arm 54 and the discharge arm 53 through the torsion spring reset to facilitate the next operation.

[0045] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

Claims

1. A mask filtration efficiency testing device, characterized in that: include: The detection device body (1) is used to detect the filtration efficiency of the mask; A mounting portion (2) is mounted on a workbench of the detection device body (1) and is used for mounting a mask clamping tool; A blanking portion (5) is mounted on the mounting portion (2) and is used for automatically blanking the mask after the mask filtration test is completed; A compensation portion (6) is mounted on the mounting portion (2) and is used to clamp the mask and perform tension compensation on the mask being clamped; The stretching portion (9) is mounted on the front side of the mounting portion (2) and is used to synchronously stretch the four corners of the mask to unfold it.

2. A mask filtration efficiency testing device according to claim 1, characterized in that: The mounting portion (2) includes a mounting frame (21), the mounting frame (21) is mounted on a workbench of the detection device body (1), the four corners of the outer wall of the mounting frame (21) are fixedly connected to a sliding frame (22), the front of the outer wall of the mounting frame (21) is fixedly connected to a supporting frame (23), the front of the outer wall of the supporting frame (23) is installed with a button switch (24), the outer wall of each of the sliding frames (22) is provided with a first rope hole (25), the back of the outer wall of the mounting frame (21) is symmetrically provided with two second rope holes (26), and the front of the outer wall of the mounting frame (21) is symmetrically provided with two third rope holes (27) and two fourth rope holes (28).

3. A mask filtration efficiency testing device according to claim 2, characterized in that: One side of the outer wall of each of the two sliding frames (22) is provided with a fixed pulley 1 (3), and the two fixed pulleys 1 (3) are symmetrically arranged with each other. Another side of the outer wall of each of the two sliding frames (22) is provided with a fixed pulley 2 (4), and the two fixed pulleys 2 (4) are symmetrically arranged with each other.

4. A mask filtration efficiency testing device according to claim 3, characterized in that: The blanking portion (5) includes two connecting pieces (51), the two connecting pieces (51) are fixedly connected to a corner of the top of the installation frame (21), a rotating rod (52) is rotatably connected between the two connecting pieces (51) through a torsion spring, and the two ends of the rotating rod (52) are respectively movable through the two connecting pieces (51), and a blanking arm (53) is fixedly sleeved on the two through ends of the rotating rod (52), and locking arms (54) are rotatably connected to both sides of the sliding frame (22) through a torsion spring, and a paddle (55) is fixedly connected between the two locking arms (54).

5. A mask filtration efficiency testing device according to claim 4, characterized in that: There are four blanking parts (5), which are respectively mounted on the four corners of the top of the mounting frame (21). The four blanking parts (5) are also respectively mounted on four sliding frames (22), and each two locking arms (54) are respectively engaged with their corresponding two blanking arms (53).

6. A mask filtration efficiency testing device according to claim 5, characterized in that: The compensation part (6) includes a U-shaped plate (61), the U-shaped plate (61) is slidably connected to the inner wall of the sliding frame (22), a spring (62) is elastically connected between the outer wall of the U-shaped plate (61) and the inner wall of the sliding frame (22), a push piece (63) is fixedly connected to the outer wall of the U-shaped plate (61), and the inner wall of the U-shaped plate (61) is rotatably connected to the outer sleeve arm (64) through a torsion spring, and the inner wall of the outer sleeve arm (64) is slidably connected to the inner wall of the outer sleeve arm (64). An inner sliding arm (65) is connected, and a tension spring is elastically connected between the bottom end of the inner sliding arm (65) and the inner wall of the outer sleeve arm (64). Push arms (66) are fixedly connected to both sides of the top end of the inner sliding arm (65). The top end of the inner sliding arm (65) is fixedly connected to an upper clamping mouth (67), and the outer wall of the top end of the outer sleeve arm (64) is fixedly connected to a lower clamping mouth (68). The clamping teeth of the upper clamping mouth (67) and the lower clamping mouth (68) are staggered.

7. A mask filtration efficiency testing device according to claim 6, characterized in that: There are four compensation parts (6), and the four compensation parts (6) are respectively installed on the inner walls of four sliding frames (22). Each push piece (63) is respectively aligned with its adjacent paddle (55).

8. A mask filtration efficiency testing device according to claim 7, characterized in that: A pull rope 1 (7) is provided in the sliding frame (22) where the two fixed pulleys 1 (3) are located. One end of the two pull ropes 1 (7) is fixedly connected to the outer wall of the adjacent U-shaped plate (61), and the other end of the two pull ropes 1 (7) slides through the corresponding rope hole 1 (25), rope hole 2 (26) and rope hole 3 (27). A pull rope 2 (8) is provided in the sliding frame (22) where the two fixed pulleys 2 (4) are located. One end of the two pull ropes 2 (8) is fixedly connected to the outer wall of the adjacent U-shaped plate (61), and the other end of the two pull ropes 2 (8) slides through the two sides of the installation frame (21) and rope hole 4 (28).

9. A mask filtration efficiency testing device according to claim 8, characterized in that: The two pull ropes (7) are respectively wound around the fixed pulley (3) adjacent thereto, and the two pull ropes (7) are also wound around the outer wall of the detection port on the workbench of the detection equipment body (1), and the two pull ropes (8) are respectively wound around the fixed pulley (4) adjacent thereto.

10. A mask filtration efficiency testing device according to claim 9, characterized in that: The stretching part (9) includes an electric push rod (91), which is installed on the inner wall of the support frame (23). A slide plate (92) is slidably connected between the inner walls of the support frame (23). The slide plate (92) is fixedly connected to the through ends of two pull ropes (7) and two pull ropes (8). The front side of the slide plate (92) is fixedly connected to a grip rod (93).

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