CN114608752A

CN114608752A - Air tightness detection device and detection method

Info

Publication number: CN114608752A
Application number: CN202210233040.5A
Authority: CN
Inventors: 周陵零; 熊道江; 杨光辉
Original assignee: SHENZHEN TIANWEIDA ELECTRONICS CO Ltd
Current assignee: SHENZHEN TIANWEIDA ELECTRONICS CO Ltd
Priority date: 2022-03-09
Filing date: 2022-03-09
Publication date: 2022-06-10

Abstract

The application discloses an air tightness detection device and a detection method, which relate to the technical field of detection equipment and comprise a machine table, wherein the machine table comprises a workbench, an air cylinder and a pressing block are arranged on the machine table, an operation block is detachably connected on the workbench, an installation cylinder is arranged on the surface of the operation block, the installation cylinder comprises an accommodating cavity, a detection block is vertically and slidably connected in the accommodating cavity, the operation block is provided with an air inlet end detection block connected with an air pump, the middle part of the surface of the detection block is provided with an air outlet hole communicated with an air inlet section and used for air outlet, a product covers the air outlet hole, the detection block is provided with a first sealing ring and a second sealing ring which are elastic, the first sealing ring and the second sealing ring are coaxially arranged, and the bottom of the product is inserted between the first sealing ring and the second sealing ring, a first pressing piece is movably arranged in the mounting cylinder, a second pressing piece is movably arranged in the mounting cylinder, and the pressing piece is pressed downwards to drive the first pressing piece and the second pressing piece to move. This application has the effect that the gas tightness to the product detected more accurately.

Description

Air tightness detection device and detection method

Technical Field

The application relates to the technical field of detection equipment, in particular to an air tightness detection device and an air tightness detection method.

Background

When some parts are produced, sampling is usually required to detect the air tightness of the parts or a sample of the parts is required to detect the air tightness, and air tightness detection equipment is usually used.

Referring to fig. 6, the present air tightness detecting apparatus is used for detecting a product 6 with a cylindrical lower part and a plastic jacket at the top, and includes a machine table 1, a pressing block 13 is arranged on the machine table 1 through a cylinder 12 in a lifting manner, the machine table 1 includes a workbench 11, an air outlet 361 connected with an air pump is arranged on the workbench 11, the air outlet 361 is covered by the product 6, the pressing block 13 is pressed against the top of the product 6, the product 6 is ventilated through the air pump and the air inlet, the air pressure inside the product 6 is displayed through an air pressure gauge on the machine table 1, and thus, whether the product 6 leaks air and the corresponding air leakage degree are determined.

In the process of implementing the application, the inventor finds that at least the following problems exist in the technology: seal through the mode of 6 bottoms of product and 11 butts of workstation, appear sealed not firm problem easily, when appearing product 6 bottoms slight unevenness or workstation 11 wearing and tearing appear especially, influence the precision that detects.

Disclosure of Invention

In order to detect the air tightness of a product more accurately, the application provides an air tightness detection device and a detection method.

In a first aspect, the present application provides an air-tightness detecting device, which adopts the following technical scheme:

the utility model provides an airtight detection device, includes the board, the board includes the workstation, is provided with the briquetting that cylinder and cylinder piston rod tip link to each other on the board, can dismantle on the workstation and be connected with the operation piece, the operation piece is kept away from the workstation and is provided with an installation section of thick bamboo on the surface, the installation section of thick bamboo includes that the middle part is used for supplying the chamber that holds that the product bottom is pegged graft, it has detection piece to hold the vertical sliding connection in intracavity, the operation piece is provided with the inlet end that links to each other with the air pump detect the piece surface middle part set up with the venthole that the section of thick bamboo intercommunication just is used for giving vent to anger that admits air, the product covers the venthole, it has elastic first sealing washer and second sealing washer to detect to be provided with on the piece, first sealing washer and the coaxial setting of second sealing washer, and product bottom pegging graft to between first sealing washer and the second sealing washer, installation section of thick bamboo internalization is provided with and is used for pressing first sealing washer and makes first sealing washer deformation support tightly at the first piece of product outer wall The installation cylinder is movably provided with a second pressing piece used for pressing the second sealing ring to enable the second sealing ring to deform and tightly press the inner wall of the product, and the pressing piece is pressed downwards to drive the first pressing piece and the second pressing piece to move.

Through adopting above-mentioned technical scheme, after waiting to detect the product plug-in to holding the intracavity and being located between first sealing washer and the second sealing washer, thereby the briquetting pushes down and makes the activity of first press part compress first sealing washer, support tightly on the product outer wall after the deformation of first sealing washer, and the second press part pushes down through the briquetting and moves about and compress the second sealing washer, support tightly on the product inner wall after the deformation of second sealing washer, make the interior outer sealing that can be better of product have higher gas tightness, through the air pump, section and venthole can make the atmospheric pressure change in the product, and detect the gas tightness of product through the change condition of atmospheric pressure.

Optionally, the detection block is provided with a boss on the surface, a product covers the boss and has a gap with the outer wall of the boss and the outer wall of the accommodating cavity, the second sealing ring sleeve is arranged outside the boss, and the detection block is provided with a positioning groove for the first sealing ring to be inserted and connected on the surface.

Through adopting above-mentioned technical scheme, set up the constant head tank and fix a position first sealing washer, the installation of the first sealing washer of being convenient for comes spacing second sealing washer through setting up the boss, leaves the grafting of the product of being convenient for in the interval before first sealing washer and the second sealing washer.

Optionally, the first sealing ring portion extends out of the positioning groove, the first pressing piece includes a pressing ring which is vertically slidably disposed in the accommodating cavity and used for pressing the first sealing ring, and the pressing ring portion penetrates out of the top of the mounting cylinder and is driven by the pressing block.

Through adopting above-mentioned technical scheme, the clamping ring slides and holding the intracavity and some outstanding installation section of thick bamboo, is convenient for push down through the briquetting and drives the clamping ring and remove, can compress first sealing washer and make first sealing washer deformation when the clamping ring pushes down.

Optionally, the second pressing part includes an annular spring plate sleeved outside the boss, the second sealing ring is fixedly connected to the outer wall of the annular spring plate, and the detection block is provided with a driving element for driving the annular spring plate to expand and deform.

Through adopting above-mentioned technical scheme, driving piece drive annular spring board expands outward for the annular spring board can promote the second sealing washer, makes the second sealing washer take place elastic deformation, and the second sealing washer can support tightly on the product inner wall, plays sealed effect.

Optionally, detect the piece bottom and seted up the operation groove, a plurality of slide openings have been seted up on the operation inslot wall, the driving piece is used for the draw runner with annular spring board inner wall butt including sliding the setting in the slide opening, the one end that annular spring board was kept away from to the draw runner is located the operation inslot, works as be used for driving the draw runner to remove when the briquetting pushes down.

Through adopting above-mentioned technical scheme, can indirectly drive the draw runner and remove along the slide opening when the briquetting pushes down for the draw runner can promote annular spring board deformation.

Optionally, hold chamber diapire middle part and be provided with the round platform section of thick bamboo that is used for sliding in the operation inslot, just the round platform section of thick bamboo upwards becomes the throat form along vertical direction, the one end butt that annular spring board was kept away from to the draw runner is in on the round platform section of thick bamboo outer wall, hold the chamber diapire with be provided with the piece that resets between the detection piece.

Through adopting above-mentioned technical scheme, promote the detection piece when the clamping ring pushes down and remove for the round platform section of thick bamboo slides in the operation groove for detecting the piece, and the round platform section of thick bamboo slides the in-process and promotes the draw runner and remove, leaves the back at the briquetting through the piece that resets, and the position that detects the piece can resume fast, is convenient for take out the product.

Optionally, the reset piece includes a plurality of springs fixed on the bottom wall of the accommodating cavity and located in the circumferential direction of the circular truncated cone, and the top of the spring is abutted to the detection block.

Through adopting above-mentioned technical scheme, when the briquetting pushed down and removed the detection piece, the spring compression, after the briquetting resets, the spring release elasticity makeed the detection piece can reset, and the annular spring board also can reset and promote the draw runner and reset.

Optionally, the outside slip cover of installation section of thick bamboo is equipped with the sleeve, the sleeve bottom be used for with operation piece surface butt, just the sleeve top is provided with and is used for pushing down the butt edge of clamping ring.

Through adopting above-mentioned technical scheme, through sleeve protection clamping ring, the mobile location of the clamping ring of also being convenient for to through the butt along overflowing that can reduce gas, play certain reinforcing sealed effect.

Optionally, the pressing block bottom is provided with a yielding groove for product insertion, and the surface of the yielding groove far away from the opening is provided with a cushion pad for abutting against the top of the product.

Through adopting above-mentioned technical scheme, set up and give way the groove and be used for holding the product and can reduce the damage that causes the product through the blotter.

On the other hand, the application provides a detection method, which adopts the air tightness detection device, and comprises the following steps:

s1: mounting the operation block on a workbench;

s2: inserting a product to be detected into the accommodating cavity from the middle part of the sleeve;

s3: pressing the pressing block downwards until the pressing block presses the bottom of the sleeve against the surface of the operation block;

s4: and ventilating the accommodating cavity through the air inlet end, and observing and recording the air pressure change condition.

By adopting the technical scheme, when the detection device is used, all parts such as the detection block, the sleeve, the first sealing ring, the second sealing ring and the operation block with the well-installed pressing ring are integrally installed on the workbench, and when products of different types need to be detected, the operation blocks of different types can be replaced; to wait that it pegs graft to holding the intracavity back through the sleeve inner wall to wait to detect the product, push down the briquetting through the cylinder, briquetting drive sleeve and clamping ring downstream, drive detection piece removes and compresses first sealing washer and spring when the clamping ring removes, the round platform section of thick bamboo removes the drive draw runner and makes the annular spring board take place deformation, second sealing washer deformation butt plays better sealed effect on the product outer wall at the product inner wall in addition to first sealing washer deformation butt, at last through air pump and inlet end, the outlet vent is aerifyd or is breathed in to product inside, the gas tightness degree of product is judged to the instruction condition through the barometer.

In summary, the present application includes at least one of the following benefits:

1. when a product to be detected is inserted into the containing cavity and positioned between the first sealing ring and the second sealing ring, the pressing block is pressed downwards to enable the first pressing piece to move so as to compress the first sealing ring, the first sealing ring is pressed against the outer wall of the product after being deformed, the second pressing piece moves through pressing of the pressing block and compresses the second sealing ring, and the second sealing ring is pressed against the inner wall of the product after being deformed so as to enable the inside and the outside of the product to be better sealed and have higher air tightness;

2. the pressing ring is protected by the sleeve, so that the pressing ring can be moved and positioned conveniently, and the abutting edge can reduce the overflow of gas and play a role in enhancing sealing;

3. the arrangement of the avoiding groove is used for accommodating products, and damage to the products can be reduced through the cushion pad.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present embodiment of the present application;

FIG. 2 is an exploded view of the operation block of the present embodiment;

FIG. 3 is a schematic view of a partial cross-sectional structure of the present embodiment of the application;

FIG. 4 is an enlarged schematic view of the structure at A in FIG. 3;

FIG. 5 is a schematic diagram of the overall structure of the detection block of the present embodiment;

fig. 6 is a schematic view of the overall structure of a gas tightness detecting device in the related art.

Description of reference numerals: 1. a machine platform; 11. a work table; 12. a cylinder; 13. briquetting; 131. a yielding groove; 132. a cushion pad; 2. an operation block; 21. mounting the cylinder; 22. an accommodating chamber; 23. an air inlet end; 24. a circular truncated cone; 241. a spring; 3. a detection block; 31. a boss; 311. a slide hole; 312. a slide bar; 32. a first seal ring; 33. a second seal ring; 34. an annular spring plate; 35. positioning a groove; 36. an operation slot; 361. an air outlet; 4. pressing a ring; 5. a sleeve; 51. an abutting edge; 6. and (5) producing the product.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

Referring to fig. 1 and 2, a conventional product 6 includes a metal cylindrical lower portion and a plastic top portion, the two portions are fixed to each other after being sleeved, and a joint of the two portions of the product 6 needs to maintain good air tightness.

The utility model provides an airtight detection device that this application embodiment discloses is used for detecting the gas tightness of foretell product 6, refer to fig. 1 and fig. 3, and this airtight detection device includes board 1, and board 1 includes the cylinder 12 at workstation 11 and top, and the piston rod of cylinder 12 reciprocates and piston rod end connection has briquetting 13, and the last operation piece 2 that is used for installing product 6 that is connected with through the bolt can be dismantled to the workstation 11, can carry out the measuring of gas tightness after product 6 is installed on operation piece 2.

Referring to fig. 2 and 4, an installation cylinder 21 with a vertical axis is integrally arranged in the middle of the surface of the operation block 2, the installation cylinder 21 comprises a cylindrical accommodation cavity 22 in the middle, and the metal cylindrical bottom of the product 6 is used for being inserted into the installation cylinder 21 and partially extends out of the installation cylinder 21. Hold the inside vertical sliding connection in chamber 22 and have cylindric detection piece 3, and be located and detect 3 tops of piece and be used for the drive to detect the first press part that piece 3 removed, first press part specifically is sliding the clamping ring 4 in holding chamber 22, clamping ring 4 part stretches out from holding chamber 22 opening, the cover is equipped with sleeve 5 on the installation section of thick bamboo 21 outer wall, sleeve 5 is including being used for with 4 butts of clamping ring and restricting the butt edge 51 that clamping ring 4 removed, drive sleeve 5 downstream when briquetting 13 pushes down, sleeve 5 drives clamping ring 4 and removes, 3 removals are detected in the drive of clamping ring 4. The accommodating cavity 22 is internally provided with a resetting piece which is used for resetting the detection block 3, the pressing ring 4 and the sleeve 5 after the pressing block 13 ascends.

Referring to fig. 2 and 4, the restoring member is specifically a plurality of springs 241 arranged on the bottom wall of the accommodating chamber 22, the springs 241 are arranged at equal intervals around the axial direction of the accommodating chamber 22, one end of each spring 241 is fixed on the bottom wall of the accommodating chamber 22 in a bonding or inserting and clamping manner, the other end of each spring 241 abuts against the bottom of the detection block 3, and the process of releasing the elastic force through the springs 241 plays a role in restoring.

Referring to fig. 4 and 5, a coaxial boss 31 is integrally arranged at the middle part of the surface of the detection block 3, the product 6 is inserted into the containing cavity 22 and is abutted against the detection block 3, the outer wall of the product 6 is close to or attached to the press ring 4, the product 6 is sleeved outside the boss 31 and has a gap with the outer wall of the boss 31 and the inner wall of the containing cavity 22, a positioning groove 35 is arranged at the edge of the surface of the detection block 3, the positioning groove 35 is a stepped groove, a first seal ring 32 is arranged in the positioning groove 35, a small part of the first seal ring 32 is positioned in the positioning groove 35, and a large part of the first seal ring extends out of the positioning groove 35 and is abutted against the bottom wall of the press ring 4, when the press ring 4 moves downwards, the first seal ring 32 can be pressed downwards and driven to deform to be close to the outer wall of the product 6 and the inner wall of the accommodating cavity 22, so that a better sealing effect is achieved, when the product 6 is not pressed down, the first sealing ring 32 is close to the product 6 or abuts against the product 6, so that the installation of the product 6 is not easily influenced.

Referring to fig. 4 and 5, a second sealing ring 33 is sleeved on the outer wall of the boss 31, the detection block 3 is provided with a second pressing member for pushing the second sealing ring 33, so that the second sealing ring 33 abuts against the inner wall of the product 6, the second pressing member is specifically an annular spring plate 34 sleeved outside the boss 31, the annular spring plate 34 is formed by pressing a strip steel, the two ends of the annular spring plate are partially overlapped, the annular spring plate 34 has better elasticity, the detection block 3 is provided with a driving member for driving the annular spring plate 34 to expand outward and deform, in the process that the pressing block 13 presses down to slide the detection block 3, the driving member can drive the annular spring plate 34 to expand outward and deform, so that the second sealing ring 33 is pushed and extruded more uniformly, and the second sealing ring 33 can abut against the inner wall of the product 6 better and has better sealing performance. When the annular spring plate 34 is not deformed, the installation of the product 6 is not easily affected.

Referring to fig. 4 and 5, hold chamber 22 bottom fixedly connected with round platform section of thick bamboo 24, round platform section of thick bamboo 24 is the cavity form and follows the vertical direction throat that makes progress, detects 3 bottoms of piece and offers the operation groove 36 that supplies round platform section of thick bamboo 24 to remove, has offered two at least spout holes 311 on the operation groove 36 inner wall, and this application uses four that evenly lay around operation groove 36 axis circumference as an example, and the one end that operation groove 36 was kept away from to spout holes 311 runs through boss 31 outer wall. The driving member is specifically a sliding bar 312 slidably connected in the sliding hole 311, one end of the sliding bar 312 is located in the operation slot 36 and abuts against the outer wall of the circular truncated cone 24, and the other end is located in the accommodating cavity 22 and abuts against the annular spring plate 34. During the process that the detection block 3 is pressed down to the lowest position by the press ring 4, the circular table cylinder 24 slides relatively in the operation groove 36 to push the slide bar 312, so that the annular spring plate 34 is deformed.

Referring to fig. 2 and 4, an air inlet end 23 connected with an air pump through an air pipe is arranged on the side wall of the operation block 2, an outlet of the air inlet end 23 penetrates through the bottom wall of the accommodating cavity 22 and is located inside the circular truncated cone 24, and an air outlet 361 is formed in the top of the operation groove 36. When the clamping ring 4 pushes down to the lowest position, the first sealing ring 32 is compressed and deformed to tightly abut against the outer wall of the product 6 and the inner wall of the accommodating cavity 22, and the second sealing ring 33 is compressed to tightly abut against the inner wall of the product 6, so that gas can enter the inner cavity of the product 6 and is not easy to run out from the abutting position of the product 6 and the detection block 3 or the gap between the detection block 3 and the accommodating cavity 22, and a better sealing effect is achieved. The air pump is used for inflating or inhaling to change the internal air pressure of the product 6, and the air pressure gauge arranged on the machine table 1 is used for displaying the change of the internal air pressure of the product 6, so that the sealing performance of the product 6 can be observed.

Referring to fig. 1 and 4, briquetting 13 bottom butt is at sleeve 5 top, and briquetting 13 bottom has been seted up and has been stepped down groove 131 and be used for supplying 6 tops butts of product, and fixedly connected with blotter 132 on the open-ended inner wall is kept away from to stepped down groove 131, can suitably deform the compression through blotter 132 and play the effect of protection product 6, when the product 6 of the type that link up about needs detect, also can play sealed effect through compression blotter 132.

The implementation principle of the air tightness detection device in the embodiment of the application is as follows: when in use, the operation block 2 with the mounted components such as the detection block 3, the sleeve 5, the first sealing ring 32, the second sealing ring 33, the pressing ring 4 and the spring 241 is integrally mounted on the workbench 11, and when different types of products 6 need to be detected, different types of operation blocks 2 can be replaced; after a product 6 to be detected is inserted into the containing cavity 22 through the inner wall of the sleeve 5, the pressing block 13 is pressed down through the air cylinder 12, the pressing block 13 drives the sleeve 5 and the pressing ring 4 to move downwards, the pressing ring 4 drives the detection block 3 to move and compresses the first sealing ring 32 and the spring 241 when moving, the circular table barrel 24 drives the sliding strip 312 to move and enables the annular spring plate 34 to deform relatively, the second sealing ring 33 deforms and abuts against the inner wall of the product 6 and the outer wall of the product 6 and the inner wall of the containing cavity 22 to achieve a good sealing effect, finally, the product 6 is inflated or sucked through the air pump and the air inlet end 23 and the air outlet hole 361, and the air tightness degree of the product 6 is judged according to the indication condition of the barometer.

The detection method disclosed by the embodiment of the application is based on the air tightness detection device and comprises the following steps of:

s1: mounting the operation block 2 on the table 11;

s2: inserting the product 6 to be detected into the containing cavity 22 from the middle part of the sleeve 5;

s3: the pressing block 13 is pressed downwards until the pressing block 13 presses the bottom of the sleeve 5 against the surface of the operation block 2;

s4: the air is ventilated into the accommodating cavity 22 through the air inlet end 23, and the air pressure change condition is observed and recorded.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides an airtight detection device, includes board (1), board (1) is provided with cylinder (12) and briquetting (13) that link to each other with cylinder (12) piston rod tip including workstation (11) on board (1), its characterized in that: the operation block (2) is detachably connected to the workbench (11), an installation cylinder (21) is arranged on the surface of the operation block (2) far away from the workbench (11), the installation cylinder (21) comprises an accommodating cavity (22) with the middle part used for inserting the bottom of a product (6), a detection block (3) is vertically connected in the accommodating cavity (22) in a sliding mode, the operation block (2) is provided with an air inlet end (23) connected with an air pump, the middle part of the surface of the detection block (3) is provided with an air outlet hole (361) communicated with the air inlet end (23) and used for giving out air, the product (6) covers the air outlet hole (361), the detection block (3) is provided with a first sealing ring (32) and a second sealing ring (33) which are elastic, the first sealing ring (32) and the second sealing ring (33) are coaxially arranged, and the bottom of the product (6) is inserted between the first sealing ring (32) and the second sealing ring (33), the inner side of the mounting cylinder (21) is movably provided with a first pressing part used for pressing the first sealing ring (32) to enable the first sealing ring (32) to deform and tightly press the outer wall of the product (6), the inner side of the mounting cylinder (21) is movably provided with a second pressing part used for pressing the second sealing ring (33) to enable the second sealing ring (33) to deform and tightly press the inner wall of the product (6), and the pressing part (13) is pressed downwards to drive the first pressing part and the second pressing part to move.

2. The airtightness detection apparatus according to claim 1, wherein: detect piece (3) and be provided with boss (31) on the surface, there is the interval between product (6) cover boss (31) and boss (31) outer wall, holding chamber (22) outer wall, second sealing washer (33) cover is established in boss (31) outside, it offers constant head tank (35) that supply first sealing washer (32) to peg graft to detect piece (3) on the surface.

3. The airtightness detection apparatus according to claim 2, wherein: the first sealing ring (32) partially extends out of the positioning groove (35), the first pressing piece comprises a pressing ring (4) which is vertically arranged in the accommodating cavity (22) in a sliding mode and used for pressing the first sealing ring (32), and the pressing ring (4) partially penetrates out of the top of the mounting cylinder (21) and is driven by the pressing block (13).

4. A gas-tightness detecting device according to claim 3, characterized in that: the second pressing piece comprises an annular spring plate (34) sleeved outside the boss (31), the second sealing ring (33) is fixedly connected to the outer wall of the annular spring plate (34), and a driving piece used for driving the annular spring plate (34) to expand and deform is arranged on the detection block (3).

5. The airtightness detection apparatus according to claim 4, wherein: detect piece (3) bottom and seted up operation groove (36), a plurality of slide openings (311) have been seted up on operation groove (36) inner wall, the driving piece is used for with draw runner (312) of annular spring board (34) inner wall butt including sliding setting in slide opening (311), draw runner (312) are kept away from the one end of annular spring board (34) and are located operation groove (36), work as briquetting (13) are used for driving draw runner (312) and remove when pushing down.

6. The airtightness detection apparatus according to claim 5, wherein: hold chamber (22) diapire middle part and be provided with and be used for sliding round platform section of thick bamboo (24) in operation groove (36), just round platform section of thick bamboo (24) upwards become the throat form along vertical direction, the one end butt that annular spring board (34) were kept away from in draw runner (312) is in on round platform section of thick bamboo (24) outer wall, hold chamber (22) diapire with be provided with the piece that resets between detection piece (3).

7. The airtightness detection apparatus according to claim 6, wherein: the reset piece comprises a plurality of springs (241) which are fixed on the bottom wall of the accommodating cavity (22) and located in the circumferential direction of the circular truncated cone (24), and the tops of the springs (241) are abutted to the detection block (3).

8. A gas-tightness detecting device according to claim 3, characterized in that: the installation section of thick bamboo (21) outside slip cover is equipped with sleeve (5), sleeve (5) bottom be used for with operation piece (2) surface butt, just sleeve (5) top is provided with and is used for pushing down the butt of clamping ring (4) is followed (51).

9. The airtightness detection apparatus according to claim 1, wherein: briquetting (13) bottom is seted up and is supplied yielding groove (131) of product (6) grafting, yielding groove (131) keep away from its open-ended and be provided with blotter (132) that are used for with product (6) top butt on the surface.

10. A method of detecting a gas tightness detecting device according to any one of claims 1 to 9, comprising the steps of:

s1: mounting the operation block (2) on a workbench (11);

s2: inserting a product (6) to be detected into the accommodating cavity (22) from the middle part of the sleeve (5);

s3: pressing the pressing block (13) downwards until the pressing block (13) presses the bottom of the sleeve (5) against the surface of the operation block (2);

s4: the air is ventilated into the accommodating cavity (22) through the air inlet end (23), and the change situation of the air pressure is observed and recorded.