A mask ventilation resistance and pressure difference tester with a sealed structure

Abstract

The present invention discloses a mask ventilation resistance and pressure difference tester with a closed structure, which relates to the technical field of mask production. It includes a processing table, on one side of the top of the processing table is provided a tester, inside the tester is installed a controller, and on the top of the tester is provided a display screen electrically connected to the controller. On the processing table are successively provided a pressing block and a base, and the pressing block and the base are used in cooperation. A processing table surface is provided on the front of the tester, the base is arranged on the processing table surface, a leveling structure is installed on the processing table surface, and a moving structure is installed on the front of the tester, and a flipping structure is arranged on the moving structure. The present invention can automatically test masks, has a high degree of automation, reduces the labor burden of operators, and can adapt to large-scale detection operations in factories. The provided leveling structure can simultaneously level and convey masks, preventing the masks from wrinkling, thereby improving the test effect and eliminating the need for manual leveling.

Description

Technical Field

[0001] The present invention relates to the technical field of mask production, and particularly to a tester for the ventilation resistance and pressure difference of a mask with a sealing structure. Background Technique

[0002] A mask is a sanitary product, generally referring to a product worn over the mouth and nose to filter the air entering the mouth and nose, so as to block harmful gases, odors, droplets, viruses and other substances, and is made of gauze, paper, etc. The mask has a certain filtering effect on the air entering the lungs. When respiratory infectious diseases are prevalent or when working in a polluted environment such as dust, wearing a mask has a very good protective effect. During the mask production process, in order to ensure the protection of the mask, it is necessary to test the ventilation resistance and pressure difference of the mask.

[0003] At present, the traditional tester for the ventilation resistance and pressure difference of masks has the following two problems when in use. First, it requires operators to detect one by one. When the number of masks to be detected is large, the labor burden of the operators is too heavy and the degree of automation is low, making it difficult to adapt to the large-scale detection operations in factories. Second, it is necessary to manually smooth the masks, but the smoothing effect is poor, and it is difficult to simply and effectively level them, which will affect the detection effect of the masks. Therefore, the present invention proposes a new solution. Summary of the Invention

[0004] The purpose of the present invention is to provide a tester for the ventilation resistance and pressure difference of a mask with a sealing structure to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A tester for the ventilation resistance and pressure difference of a mask with a sealing structure, including a processing table. On one side of the top of the processing table, there is a tester. A controller is installed inside the tester, and a display screen electrically connected to the controller is provided on the top of the tester. On the processing table, there are a pressing block and a base in sequence. The pressing block and the base are used in cooperation. A processing table surface is provided on the front of the tester, and the base is arranged on the processing table surface. A leveling structure is installed on the processing table surface. A moving structure is installed on the front of the tester. A flipping structure is arranged on the moving structure. The flipping structure is used to adjust the mask in the vertical state to the horizontal state. On one side of the processing table, vertical rods are symmetrically welded. A conveying structure is installed between the vertical rods. One end of the conveying structure is provided with a turning structure for switching the mask to the vertical state. The turning structure is located above the flipping structure. The moving structure, the flipping structure, the leveling structure, the conveying structure and the turning structure are all electrically connected to the controller.

[0006] As a preferred technical solution in the present application, the conveying structure includes a conveyor disposed between the vertical rods. Limit strips are symmetrically arranged on the top of the conveyor. The limit strips do not contact the top of the conveyor, and the distance between the limit strips is greater than the length of the mask. The limit strips and the vertical rods are fixedly connected by a plurality of fixing rods. The steering structure is fixed at the discharge end of the conveyor.

[0007] As a preferred technical solution in the present application, the steering structure includes a mounting plate fixed on the vertical rod. An electromagnetic clamp is rotatably connected to the mounting plate. The electromagnetic clamp includes an electromagnetic clamping plate and a cut-off valve. A T-shaped groove is formed on the front surface of the electromagnetic clamp. A sliding block is slidably connected in the T-shaped groove. An iron plate is fixedly connected to the sliding block. A steering motor is provided on the back surface of the mounting plate. The output end of the steering motor is fixedly connected to the electromagnetic clamp.

[0008] As a preferred technical solution in the present application, the moving structure includes moving rails symmetrically and horizontally welded on the front surface of the tester. A cross frame is slidably connected between the moving rails. A cylinder is installed on the front surface of the tester. One end of the cylinder is fixed on the cross frame.

[0009] As a preferred technical solution in the present application, the flipping structure includes vertical plates symmetrically welded on the cross frame. A rotating shaft is rotatably connected between one sides of the vertical plates. Short shafts are integrally formed at both ends of the rotating shaft. A rotating block is fixedly connected to the rotating shaft. A vertical plate is welded on one side of the rotating block. A storage box for placing the mask is horizontally welded on the vertical plate. Connecting plates are welded on the outer sides of the vertical plates. Fixing blocks are fixedly connected to the outer sides of the connecting plates. The short shafts all penetrate through the fixing blocks and are rotatably connected to the fixing blocks. A rotating rod is rotatably connected to the outer side of one of the fixing blocks. The rotating rod is fixed at one end of the short shaft. A vertically arranged hydraulic cylinder is fixedly connected to the outer side of one of the vertical plates. A sliding plate is slidably connected to the hydraulic cylinder. The top end of the sliding plate is fixed to the top end of the output shaft of the hydraulic cylinder. A limiting plate is fixedly connected to the outer side of the sliding plate. A limiting groove is formed on one side of the bottom of the limiting plate. The rotating rod is located on the back surface of the limiting plate and one end of the rotating rod is rotatably connected to a rolling wheel adapted to the limiting groove. The hydraulic cylinder is electrically connected to the controller.

[0010] As a preferred technical solution in the present application, the leveling structure includes support plates symmetrically fixed on the processing tabletop. Leveling rollers are symmetrically rotatably connected between the support plates. Connecting rods are integrally formed on the leveling rollers. A driving gear is welded to one end of one of the connecting rods. A driven gear meshing with the driving gear is welded to the other connecting rod. A leveling motor is provided on one of the support plates. The output end of the leveling motor is fixedly connected to one of the connecting rods.

[0011] As a preferred technical solution in the present application, a sealing ring is fixedly connected to the bottom of the pressing block. A ventilation hole is formed at the center of the top of the base. An annular groove is formed outside the ventilation hole. A sealing rubber ring adapted to the sealing ring is provided in the annular groove.

[0012] As a preferred technical solution in the present application, a top block is welded to the top of the sliding plate, and the output end of the hydraulic cylinder is fixed to the top block.

[0013] As a preferred technical solution in the present application, sliding grooves are provided on both sides of the hydraulic cylinder, and sliding blocks adapted to the sliding grooves are integrally formed on both sides of the sliding plate.

[0014] As a preferred technical solution in the present application, moving grooves are provided on the top of the moving rails, angle plates are welded to both ends of the cross frame, and a plurality of sliding wheels adapted to the moving grooves are provided at the bottom of the angle plates.

[0015] As a preferred technical solution in the present application, the limiting strip is L-shaped, and the height of the limiting strip is greater than the thickness of the mask.

[0016] As a preferred technical solution in the present application, the axes of the sealing ring, the ventilation hole, the circular ring groove, and the sealing rubber ring are all on the same straight line.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] For the mask ventilation resistance and pressure difference tester with a closed structure, a conveying structure conveys a plurality of horizontal masks, a steering structure clamps the masks and adjusts the horizontally placed masks to the vertical direction, then the steering structure places the masks on the flipping structure. After the moving structure drives the flipping structure close to the detector, the flipping structure adjusts the vertical masks to the horizontal direction, and then a leveling structure levels and conveys the masks and conveys the leveled masks to the base on the detector for testing. This device can automatically test masks, has a high degree of automation, reduces the labor burden of operators, and can adapt to large-scale detection operations in factories.

[0019] In addition, the provided leveling structure can level and convey the masks at the same time, preventing the masks from wrinkling, thereby improving the test effect without manual leveling. By providing a sealing ring on the pressing block and a sealing rubber ring on the base, good sealing can be ensured when measuring the pressure difference of the masks, allowing the gas to pass through the masks and not leak from the sides, thus making the pressure difference measurement results accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the first three-dimensional structure diagram of the present invention;

[0021] Figure 2 It is the second three-dimensional structure diagram of the present invention;

[0022] Figure 3 It is the first three-dimensional structure diagram of the leveling structure, flipping structure and moving structure of the present invention;

[0023] Figure 4 The second three-dimensional structure diagram of the leveling structure, flipping structure and moving structure of the present invention;

[0024] Figure 5 Of the present invention Figure 3 The enlarged structure diagram of part B in;

[0025] Figure 6 The three-dimensional structure diagram of the conveying structure and steering structure of the present invention;

[0026] Figure 7 The three-dimensional structure diagram of the leveling structure of the present invention after removing the protection box;

[0027] Figure 8 The three-dimensional structure diagram of the steering structure of the present invention;

[0028] Figure 9 Of the present invention Figure 2 The enlarged structure diagram of part A in.

[0029] In the figure: 1, processing table; 101, universal wheel; 102, vertical rod; 2, tester; 201, display screen; 202, pressing block; 203, sealing ring; 204, base; 205, ventilation hole; 206, sealing rubber ring; 3, moving structure; 301, moving rail; 302, cross frame; 303, sliding wheel; 304, cylinder; 4, leveling structure; 401, support plate; 402, leveling roller; 403, connecting rod; 404, driven gear; 405, driving gear; 406, leveling motor; 5, flipping structure; 501, vertical plate; 502, rotating shaft; 503, rotating block; 504, vertical plate; 505, connecting plate; 506, fixed block; 507, rotating rod; 508, rolling wheel; 509, hydraulic cylinder; 510, sliding plate; 511, limiting plate; 512, limiting groove; 513, storage box; 514, top block; 6, steering structure; 601, electromagnetic fixture; 602, electromagnetic clamping plate; 603, sliding block; 604, iron plate; 605, cut-off valve; 606, mounting plate; 607, steering motor; 7, conveying structure; 701, conveyor; 702, limiting strip; 703, fixed rod. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0032] In addition, it should be understood that for the convenience of description, the sizes of the various components shown in the drawings are not drawn according to the actual proportional relationship. For example, the thickness or width of some layers may be exaggerated relative to other layers.

[0033] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined or described in one drawing, it will not be necessary to further specifically discuss and describe it in the description of subsequent drawings.

[0034] As Figures 1-9 shown, the present invention provides a technical solution: a mask ventilation resistance and pressure difference tester with a sealed structure, including a processing table 1. On one side of the top of the processing table 1, there is a tester 2. It should be noted that universal wheels 101 with brakes are provided at the four corners of the bottom of the processing table 1, which is convenient for adjusting the position of the device. A controller is installed in the tester 2, and a display screen 201 electrically connected to the controller is provided on the top of the tester 2. A pressing block 202 and a base 204 are successively arranged on the processing table 1. The pressing block 202 and the base 204 are used in cooperation. A processing table surface is provided on the front of the tester 2, and the base 204 is arranged on the processing table surface. A leveling structure 4 is installed on the processing table surface. A moving structure 3 is installed on the front of the tester 2. A flipping structure 5 is arranged on the moving structure 3. The flipping structure 5 is used to adjust the mask in the vertical state to the horizontal state. Vertical rods 102 are symmetrically welded on one side of the processing table 1. A conveying structure 7 is installed between the vertical rods 102. One end of the conveying structure 7 is provided with a turning structure 6 for switching the mask to the vertical state. The turning structure 6 is located above the flipping structure 5. The moving structure 3, the flipping structure 5, the leveling structure 4, the conveying structure 7, and the turning structure 6 are all electrically connected to the controller.

[0035] As a specific embodiment, the conveying structure 7 includes a conveyor 701 disposed between the vertical rods 102. Symmetrically arranged limit bars 702 are provided at the top of the conveyor 701. The limit bars 702 do not contact the top of the conveyor 701, and the distance between the limit bars 702 is greater than the length of the mask. The limit bars 702 and the vertical rods 102 are fixedly connected by a plurality of fixing rods 703. The steering structure 6 is fixed at the discharge end of the conveyor 701. It should be noted that the limit bars 702 are L-shaped, and the height of the limit bars 702 is greater than the thickness of the mask. When the mask is being conveyed, the limit bars 702 can play a good limiting role. Since the mask is light, the limit bars 702 can prevent the mask from being blown away, play a role in assisting the conveyance, and are also beneficial for the steering structure 6 to clamp the mask. It should be noted that the conveyor 701 is controlled by a controller, and the on and off of the conveyor 701 are preset to ensure that the conveyor 701 pauses every time the steering structure 6 clamps the mask.

[0036] As a specific embodiment, the steering structure 6 includes a mounting plate 606 fixed on the vertical rod 102. An electromagnetic clamp 601 is rotatably connected to the mounting plate 606. The electromagnetic clamp 601 includes an electromagnetic clamping plate 602 and a cut-off valve 605. A T-shaped groove is formed on the front surface of the electromagnetic clamp 601. A sliding block 603 is slidably connected in the T-shaped groove. An iron plate 604 is fixedly connected to the sliding block 603. A steering motor 607 is provided on the back surface of the mounting plate 606. The output end of the steering motor 607 is fixedly connected to the electromagnetic clamp 601. It should be noted that the electromagnetic clamp 601 is a prior art. The specific electromagnetic clamping plate 602 and cut-off valve 605 are both prior arts. Specifically, the cut-off valve 605 can control whether the electromagnetic clamping plate 602 is magnetic. When the mask on the conveyor 701 is conveyed to the steering structure 6, at this time the mask is placed between the electromagnetic clamping plate 602 and the iron plate 604. Then the controller controls the cut-off valve 605 to open, and the electromagnetic clamping plate 602 becomes magnetic. Since the sliding block 603 is slidably connected to the electromagnetic clamp 601, it can attract the iron plate 604 to move upward, thereby clamping the mask. Then the controller controls the steering motor 607 to start, and the steering motor 607 drives the electromagnetic clamp 601 to rotate 90 degrees, so that the horizontal mask is adjusted to be vertical. At this time, the storage box 513 is in a vertical state and is located directly below the electromagnetic clamp 601. Then the controller closes the cut-off valve 605, and the electromagnetic clamping plate 602 loses magnetism, so that the mask smoothly drops from the electromagnetic clamp 601 and falls into the storage box 513. It should be noted that the width of the storage box 413 is smaller than the width of the mask, so that the mask will not all be stored in the storage box 413, and the left side of the mask will exceed the storage box 413, so that the mask can enter the leveling structure 4.

[0037] As a specific embodiment, the moving structure 3 includes moving rails 301 symmetrically and horizontally welded to the front of the tester 2. A cross frame 302 is slidably connected between the moving rails 301. A cylinder 304 is installed on the front of the tester 2, and one end of the cylinder 304 is fixed to the cross frame 302.

[0038] As a specific embodiment, the flipping structure 5 includes vertical plates 501 symmetrically welded to the cross frame 302. A rotating shaft 502 is rotatably connected between one sides of the vertical plates 501. Short shafts are integrally formed at both ends of the rotating shaft 502. A rotating block 503 is fixedly connected to the rotating shaft 502. A vertical plate 504 is welded to one side of the rotating block 503. A storage box 513 for placing masks is horizontally welded to the vertical plate 504. Connecting plates 505 are welded to the outer sides of the vertical plates 501. Fixed blocks 506 are fixedly connected to the outer sides of the connecting plates 505. The short shafts all pass through the fixed blocks 506 and are rotatably connected to the fixed blocks 506. A rotating rod 507 is rotatably connected to the outer side of one of the fixed blocks 506. The rotating rod 507 is fixed to one end of the short shaft. A vertically arranged hydraulic cylinder 509 is fixedly connected to the outer side of one of the vertical plates 504. A sliding plate 510 is slidably connected to the hydraulic cylinder 509. The top end of the sliding plate 510 is fixed to the top end of the output shaft of the hydraulic cylinder 509. A limiting plate 511 is fixedly connected to the outer side of the sliding plate 510. A limiting groove 512 is formed in one side of the bottom of the limiting plate 511. The rotating rod 507 is located on the back of the limiting plate 511, and one end of the rotating rod 507 is rotatably connected to a rolling wheel 508 adapted to the limiting groove 512. The hydraulic cylinder 509 is electrically connected to the controller. It should be noted that a top block 514 is welded to the top of the sliding plate 510, the output end of the hydraulic cylinder 509 is fixed to the top block 514, and sliding grooves are formed on both sides of the hydraulic cylinder 509. Sliding blocks adapted to the sliding grooves are integrally formed on both sides of the sliding plate 510. It should be noted that the sliding blocks are T-shaped plates, so that the sliding plate 510 can be limited to the outer shell of the hydraulic cylinder 509 and can also slide on the hydraulic cylinder 509, and will not fall off while sliding.

[0039] It should be noted that after the steering structure 6 places the vertical mask on the storage box 513 of the flipping structure 5, at this time, the mask needs to be adjusted to a horizontal state. At this time, the controller is used to turn on the hydraulic cylinder 509 to shorten, thereby driving the sliding plate 510 to move downward, and then driving the limiting plate 511 fixed to the sliding plate 510 to move downward. Since the rolling wheel 508 is limited in the limiting groove 512 of the limiting plate 511, it can drive the rotating rod 507 to rotate counterclockwise by 90 degrees, and then drive the rotating shaft 502 fixed to the rotating rod 507 to rotate counterclockwise and drive the rotating block 503 fixed to the rotating shaft 502 to rotate counterclockwise by 90 degrees, and finally drive the mask in the storage box 513 to rotate counterclockwise, so as to change the vertical mask into a horizontal state.

[0040] As a specific embodiment, the leveling structure 4 includes support plates 401 symmetrically fixed on the processing tabletop. Between the support plates 401, leveling rollers 402 are symmetrically and rotatably connected. Connecting rods 403 are integrally formed on the leveling rollers 402. At one end of one connecting rod 403, a driving gear 405 is welded. On the other connecting rod 403, a driven gear 404 meshing with the driving gear 405 is welded. A leveling motor 406 is provided on one support plate 401, and the output end of the leveling motor 406 is fixedly connected to one connecting rod 403.

[0041] It should be noted that when the moving structure 3 moves the mask in the flipping structure 5 into the leveling structure 4, at this time, the controller turns on the leveling motor 406. The leveling motor 406 drives the top leveling roller 402 and the driving gear 405 to rotate. Since the driving gear 405 and the driven gear 404 are meshed, it can drive the driving gear 405 and the driven gear 404 to rotate. Due to gear transmission, the rotation directions of the driving gear 405 and the driven gear 404 are opposite, and the thickness of the mask is slightly greater than the distance between the driving gear 405 and the driven gear 404. In this way, the mask can be leveled and at the same time the mask can be conveyed onto the base 204.

[0042] As a specific embodiment, a sealing ring 203 is fixedly connected to the bottom of the pressing block 202. An air vent 205 is opened at the center of the top of the base 204. An annular groove is opened outside the air vent 205. A sealing rubber ring 206 adapted to the sealing ring 203 is provided in the annular groove. Air holes are opened in the pressing block 202. It should be noted that the axes of the sealing ring 203, the air vent 205, the annular groove and the sealing rubber ring 206 are all on the same straight line. It should be noted that the sealing ring 203 is made of hard plastic, while the sealing rubber ring 206 is made of rubber. In this way, during detection, the sealing ring 203 is inserted into the sealing rubber ring 206, so that the air passage is sealed, ensuring good sealing between the pressing block 202 and the base 204, ensuring the accuracy of the measurement result, and effectively preventing gas leakage.

[0043] As a specific embodiment, moving grooves are opened at the top of the moving rails 301. Angle plates are welded at both ends of the cross frame 302. A plurality of sliding wheels 303 adapted to the moving grooves are provided at the bottom of the angle plates. This can effectively reduce the friction force, improve the moving efficiency of the flipping structure 5, and thus improve the detection efficiency.

[0044] Specifically, when testing masks, first, a plurality of masks are sequentially placed on the conveyor 701, then the conveyor 701 transports the masks to the steering structure 6. Then, the steering structure 6 clamps the horizontal masks and adjusts them to a vertical position. Further, the controller controls the cut-off valve 605 to close, so that the vertical masks fall into the storage box 513. Then, the controller controls the flipping structure 5 to rotate, thereby adjusting the masks in the storage box 513 to a horizontal state. Further, the moving structure 3 pulls the flipping structure 5 to move leftward, so that the horizontal masks are inserted into the leveling structure 4. At the same time, the leveling structure 4 is turned on. While leveling the masks, the leveling structure 4 can also transport the masks to the base 204. Then, the tester 2 tests the masks, and so on for the remaining masks. This device can automatically test masks, with a high degree of automation, a small labor burden on operators, and can adapt to large-scale detection operations in factories.

[0045] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tester for the ventilation resistance and pressure difference of a mask with a closed structure, comprising a processing table (1). On one side of the top of the processing table (1), there is a tester (2). A controller is installed inside the tester (2), and a display screen (201) electrically connected to the controller is provided on the top of the tester (2). A pressing block (202) and a base (204) are successively arranged on the processing table (1). The pressing block (202) and the base (204) are used in cooperation. It is characterized in that: A processing table surface is provided on the front of the tester (2). The base (204) is arranged on the processing table surface. A leveling structure (4) is installed on the processing table surface. A moving structure (3) is installed on the front of the tester (2). A flipping structure (5) is arranged on the moving structure (3). The flipping structure (5) is used to adjust the mask in a vertical state to a horizontal state. On one side of the processing table (1), vertical rods (102) are symmetrically welded. A conveying structure (7) is installed between the vertical rods (102). One end of the conveying structure (7) is provided with a steering structure (6) for switching the mask to a vertical state. The steering structure (6) is located above the flipping structure (5). The moving structure (3), the flipping structure (5), the leveling structure (4), the conveying structure (7) and the steering structure (6) are all electrically connected to the controller; The steering structure (6) includes a mounting plate (606) fixed on the vertical rod (102). An electromagnetic fixture (601) is rotatably connected to the mounting plate (606). The electromagnetic fixture (601) includes an electromagnetic clamping plate (602) and a cut-off valve (605). A T-shaped groove is provided on the front of the electromagnetic fixture (601). A sliding block (603) is slidably connected in the T-shaped groove. An iron plate (604) is fixedly connected to the sliding block (603). A steering motor (607) is provided on the back of the mounting plate (606). The output end of the steering motor (607) is fixedly connected to the electromagnetic fixture (601); The flipping structure (5) includes vertical plates (501) symmetrically welded to the cross frame (302). A rotating shaft (502) is rotatably connected between one sides of the vertical plates (501). Short shafts are integrally formed at both ends of the rotating shaft (502). A rotating block (503) is fixedly connected to the rotating shaft (502). A vertical plate (504) is welded to one side of the rotating block (503). A storage box (513) for placing masks is horizontally welded to the vertical plate (504). Connecting plates (505) are welded to the outer sides of the vertical plates (501). Fixed blocks (506) are fixedly connected to the outer sides of the connecting plates (505). The short shafts penetrate through the fixed blocks (506) and are rotatably connected to the fixed blocks (506). A rotating rod (507) is rotatably connected to the outer side of one of the fixed blocks (506). The rotating rod (507) is fixed to one end of the short shaft. A vertically arranged hydraulic cylinder (509) is fixedly connected to the outer side of one of the vertical plates (504). A sliding plate (510) is slidably connected to the hydraulic cylinder (509). The top end of the sliding plate (510) is fixed to the top end of the output shaft of the hydraulic cylinder (509). A limiting plate (511) is fixedly connected to the outer side of the sliding plate (510). A limiting groove (512) is formed in one side of the bottom of the limiting plate (511). The rotating rod (507) is located on the back of the limiting plate (511), and a rolling wheel (508) adapted to the limiting groove (512) is rotatably connected to one end of the rotating rod (507). The hydraulic cylinder (509) is electrically connected to the controller.

2. The air permeability resistance and pressure difference tester for masks with a sealing structure according to claim 1, characterized in that: The conveying structure (7) includes a conveyor (701) arranged between the vertical rods (102). Limiting strips (702) are symmetrically arranged on the top of the conveyor (701). The limiting strips (702) do not contact the top of the conveyor (701), and the distance between the limiting strips (702) is greater than the length of the mask. The limiting strips (702) and the vertical rods (102) are fixedly connected by a plurality of fixing rods (703). The steering structure (6) is fixed at the discharge end of the conveyor (701).

3. The air permeability resistance and pressure difference tester for masks with a sealing structure according to claim 1, characterized in that: The moving structure (3) includes moving rails (301) symmetrically and horizontally welded to the front of the tester (2). A cross frame (302) is slidably connected between the moving rails (301). An air cylinder (304) is installed on the front of the tester (2). One end of the air cylinder (304) is fixed to the cross frame (302).

4. The air permeability resistance and pressure difference tester for masks with a sealing structure according to claim 1, characterized in that: The leveling structure (4) includes support plates (401) symmetrically fixed on the processing tabletop. Between the support plates (401), leveling rollers (402) are symmetrically rotatably connected. Connecting rods (403) are integrally formed on the leveling rollers (402). One end of a connecting rod (403) is welded with a driving gear (405), and a driven gear (404) meshing with the driving gear (405) is welded on the other connecting rod (403). A leveling motor (406) is provided on one support plate (401), and the output end of the leveling motor (406) is fixedly connected with a connecting rod (403).

5. The air permeability resistance and pressure difference tester for masks with a closed structure according to claim 1, characterized in that: A sealing ring (203) is fixedly connected to the bottom of the pressing block (202). A ventilation hole (205) is opened at the center of the top of the base (204). An annular groove is opened outside the ventilation hole (205), and a sealing rubber ring (206) adapted to the sealing ring (203) is provided in the annular groove.

6. The air permeability resistance and pressure difference tester for masks with a closed structure according to claim 1, characterized in that: A top block (514) is welded to the top of the sliding plate (510), and the output end of the hydraulic cylinder (509) is fixed on the top block (514).

7. The air permeability resistance and pressure difference tester for masks with a closed structure according to claim 1, characterized in that: Chute grooves are opened on both sides of the hydraulic cylinder (509), and sliding blocks adapted to the chute grooves are integrally formed on both sides of the sliding plate (510).

8. The air permeability resistance and pressure difference tester for masks with a closed structure according to claim 3, characterized in that: Moving grooves are opened on the top of the moving rails (301). Angle plates are welded to both ends of the cross frame (302), and a plurality of sliding wheels (303) adapted to the moving grooves are provided at the bottom of the angle plates.

9. The air permeability resistance and pressure difference tester for masks with a closed structure according to claim 2, characterized in that: The limiting strip (702) is L-shaped, and the height of the limiting strip (702) is greater than the thickness of the mask.

10. The air permeability resistance and pressure difference tester for masks with a closed structure according to claim 5, characterized in that: The axes of the sealing ring (203), the ventilation hole (205), the annular groove and the sealing rubber ring (206) are all on the same straight line.

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