Air tightness testing device

Abstract

The present invention relates to the technical field of seal detection, and proposes an airtightness detection device, including a detection frame, a pressure shell arranged on the detection frame, the pressure shell having a pressure chamber and a first mounting portion, the first mounting portion being located at one end of the pressure chamber, a marking part rotating and sliding relative to the detection frame, and a moving track around the circumference of the pressure chamber, a first marking head sliding radially along the rotating shaft of the marking part, and used to abut or cancel abutment with the surface of a workpiece after sliding. The above technical scheme solves the problem that the results of the pressure detection of pipe fittings and the marking after the detection need to be done manually in the prior art, resulting in low work efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing component detection, and in particular to an airtightness detection device. Background Art

[0002] In the precision field of modern industrial manufacturing, the air tightness test of pipe fittings is undoubtedly a crucial quality control link, which is directly related to the performance stability and service life of the product. The production technology usually adopts the immersion method or the stable air pressure method. The stable air pressure method injects air into one end of the pipe fitting, and the other end is connected to a pressure detection component. After stopping the air injection, the internal pressure change within a fixed time period is detected, and the qualified air tightness is marked. In this process of the existing technology, the pressure test results and the marking after the test need to be done manually, which has low work efficiency. Summary of the invention

[0003] The present invention provides an air tightness detection device, which solves the problem in the related art that both the result of the pipe pressure detection and the marking after the detection need to be done manually, resulting in low work efficiency.

[0004] The technical solution of the present invention is as follows:

[0005] Air tightness detection device, used to detect the air tightness of the workpiece and mark it, including:

[0006] Detection rack,

[0007] A pressure shell, the pressure shell is arranged on the detection frame, the pressure shell has a pressure chamber and a first mounting portion, the first mounting portion is located at one end of the pressure chamber,

[0008] The marking piece is rotatably and slidably arranged relative to the detection frame, and the moving track is around the circumference of the pressure shell,

[0009] The first marking head is radially slidably arranged along the rotating shaft of the marking member, and is used to abut against or cancel the abutment with the surface of the workpiece after sliding.

[0010] As a further technical solution, it also includes:

[0011] The flexible part is arranged on the pressure shell, and after the pressure in the pressure chamber changes, the flexible part is deformed, so as to detect the air tightness of the pressure chamber.

[0012] As a further technical solution, the detection frame has an annular slide groove, the flexible portion is annular, and further comprises:

[0013] A slide seat, wherein the slide seat is slidably arranged in the annular slide groove,

[0014] A shaft portion, the shaft portion is rotatably arranged on the slide seat, and the marking member is arranged on the shaft portion,

[0015] The pushing platform is slidably arranged on the shaft portion and rotates with the shaft portion. After the flexible portion is expanded, it abuts against the outer surface of the pushing platform to drive the pushing platform to rotate.

[0016] As a further technical solution, the marking piece is a hollow column, the pushing platform is set to be a frustum, and has a first frustum surface, and the flexible part abuts against the first frustum surface to drive the pushing platform to slide, and further includes:

[0017] A driving block, wherein the driving block is slidably arranged on the shaft portion, and after the pushing platform slides, the driving block is driven to slide, the driving block has a second frustum surface, and the first marking head has a sliding portion, and the sliding portion of the first marking head is slidably arranged on the second frustum surface. After the driving block slides, the first marking head is driven to slide in a direction away from the axis of the shaft portion.

[0018] As a further technical solution, it also includes:

[0019] The second marking head has the same structure as the first marking head, is radially slidably arranged along the rotating shaft of the marking component, and is axially spaced from the first marking head along the shaft portion, and is used to abut or cancel abutment with the surface of the workpiece after sliding, wherein the driving block has a third frustum surface, the second frustum surface and the third frustum surface are symmetrically arranged, and the driving block is located between the first marking head and the second marking head, and after the driving block slides, it drives the first marking head or the second marking head to slide in a direction away from the axis of the shaft portion.

[0020] As a further technical solution, the first marking head and the second marking head are both in a plurality and are arranged circumferentially on the marking part, and further include:

[0021] A first elastic member, one end of which acts on the first marking head or the second marking head, and the other end of which acts on the inner wall of the marking object, providing a force in the axial direction of the first marking head or the second marking head to move closer to or away from the marking object.

[0022] As a further technical solution, it also includes:

[0023] A second elastic member, wherein one end of the second elastic member acts on one end of the marking member, and the other end of the second elastic member acts on one end of the pushing platform to provide a force to push the pushing platform away from the marking member.

[0024] As a further technical solution, it also includes:

[0025] A first gear, which is rotatably disposed on the detection frame and is coaxially disposed with the pressure shell,

[0026] The second gear is disposed on the shaft portion, and the first gear is meshed with the second gear.

[0027] As a further technical solution, it also includes:

[0028] The injection molding part is arranged on one side of the detection frame, and the injection molding part has a second mounting portion,

[0029] The clamping parts are arranged in pairs and are lifted and slidably arranged on the detection frame. The first mounting part and the second mounting part are both provided with clamping parts. After the two clamping parts located at the first mounting part slide, they move closer to or farther away from each other, forming a first clamping space between the first mounting part, and the two clamping parts located at the second mounting part move closer to or farther away from each other, forming a second clamping space between the second mounting part.

[0030] As a further technical solution, the annular slide groove has a radial guide groove therein, and further comprises:

[0031] A card block is slidably arranged in the guide groove.

[0032] A third elastic member, one end of which acts on the bottom of the guide groove, and the other end of which acts on the clamping block to provide a force to move the clamping block away from the bottom of the guide groove.

[0033] The working principle and beneficial effects of the present invention are:

[0034] In the present invention, a pressure shell is provided on the detection part, and one end of the workpiece is used to be provided on the first mounting part of the pressure shell. Air is injected into the pressure chamber from the other end of the workpiece, and the pressure change in the pressure chamber is observed to determine whether the workpiece has leakage. In this scheme, a marking part that can simultaneously realize self-rotation and revolution around the pressure shell is provided, and a first marking head that is radially slidable along the rotating shaft is provided on the marking part. The outer side of the first marking part has a portion that can be painted. On the one hand, the movement of the first marking head can be manipulated by the control system to realize the convenient marking of the surface of the workpiece that has passed the inspection. On the other hand, the workpiece at different positions can be flexibly marked in a dotted, linear or ring shape by controlling the extension or retraction of the first marking head as needed, and different marking methods can be performed on the workpiece with different detection results. Through the above design, the airtightness detection device of this embodiment realizes the automation of airtightness detection and marking of workpieces, greatly improves production efficiency and detection accuracy, and provides strong technical support for modern industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0036] Figure 1 It is a schematic diagram of the structure of the present invention;

[0037] Figure 2 It is a schematic diagram of the structure of the detection frame of the present invention from one viewing angle;

[0038] Figure 3 This is another structural schematic diagram of the detection frame of the present invention from another viewing angle;

[0039] Figure 4 It is a structural schematic diagram of the central axis of the present invention;

[0040] Figure 5 It is a schematic diagram of the internal structure of the pressure shell in the present invention;

[0041] Figure 6 for Figure 5 A is a schematic diagram of the partially enlarged structure.

[0042] In the figure: detection frame -1, annular slide groove -101, guide groove -102, pressure shell -2, pressure chamber -201, first mounting part -202, marking part -3, first marking head -4, sliding part -401, flexible part -5, slide seat -6, shaft part -7, pushing platform -8, first conical surface -801, driving block -9, second conical surface -901, third conical surface -902, second marking head -10, first elastic part -11, second elastic part -12, first gear -13, second gear -14, injection molding part -15, second mounting part -1501, clamping part -16, first clamping space -1601, second clamping space -1602, clamping block -17, third elastic part -18. DETAILED DESCRIPTION

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0044] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0045] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0047] Reference Figure 1 to Figure 6 An embodiment of the present invention proposes an airtightness detection device for detecting the airtightness of a workpiece and marking it, including a detection frame 1, a pressure shell 2 is arranged on the detection frame 1, the pressure shell 2 has a pressure chamber 201 and a first mounting portion 202, the first mounting portion 202 is located at one end of the pressure chamber 201, a marking member 3 is rotatable and slidably arranged relative to the detection frame 1, and the moving trajectory is around the circumference of the pressure shell 2, the first marking head 4 is radially slidably arranged along the rotating axis of the marking member 3, and is used to abut or cancel the abutment with the surface of the workpiece after sliding.

[0048] In this embodiment, taking into account the low efficiency of detecting and marking workpieces in the prior art, a pressure shell 2 is provided on the detection piece in this scheme, and one end of the workpiece is used to be set on the first mounting portion 202 of the pressure shell 2, and air is injected into the pressure chamber 201 from the other end of the workpiece. By observing the pressure changes in the pressure chamber 201, it is determined whether there is any leakage in the workpiece. In the present scheme, a marking component 3 is provided which can realize both self-rotation and revolution around the pressure shell 2. A first marking head 4 is provided on the marking component 3 which is radially slidable along the rotating shaft. The outer side of the first marking component 3 has a portion which can be painted. On the one hand, the movement of the first marking head 4 can be controlled by the control system to realize the convenient marking of the surface of the workpiece that has passed the inspection. On the other hand, the workpiece at different positions can be flexibly marked in a dotted, linear or ring shape by controlling the extension or retraction of the first marking head 4 as needed, and different marking methods can be performed on the workpieces with different inspection results. Through the above design, the airtightness detection device of the present embodiment realizes the automation of airtightness detection and marking of workpieces, greatly improves the production efficiency and detection accuracy, and provides strong technical support for modern industrial production.

[0049] Furthermore, the flexible portion 5 is provided on the pressure-bearing shell 2 . When the pressure in the pressure-bearing chamber 201 changes, the flexible portion 5 is deformed to detect the air tightness of the pressure-bearing chamber 201 .

[0050] In this embodiment, a flexible portion 5 is provided on the pressure shell 2. When pressure is injected into the pressure chamber 201, the flexible portion 5 expands. The flexible portion 5 is made of a highly elastic, pressure-resistant material, such as a specially made rubber or polymer diaphragm. Its shape and size are customized according to the internal structure of the pressure shell 2 and the detection requirements to ensure that it can fit tightly to a specific area of ​​the pressure shell 2, and together with the pressure shell 2, form a cavity with one end open and the rest of the parts well sealed. The design of the flexible portion 5 enables it to produce obvious deformation when the pressure in the pressure chamber 201 changes, and whether there is leakage can be determined by manually observing the change in size or detecting with sensors. Real-time monitoring of the airtightness in the pressure chamber 201 is achieved, unqualified workpieces are discovered and marked in a timely manner, and production efficiency is improved. The sensitivity and reliability of detection are significantly improved,

[0051] Furthermore, the detection frame 1 has an annular slide groove 101, the flexible part 5 is annular, and also includes a slide seat 6 slidably set in the annular slide groove 101, the shaft part 7 is rotatably set on the slide seat 6, the marking part 3 is set on the shaft part 7, and the pushing platform 8 is slidably set on the shaft part 7, and rotates with the shaft part 7. After the flexible part 5 expands, it abuts against the outer surface of the pushing platform 8, driving the pushing platform 8 to rotate.

[0052] In this embodiment, an annular groove 101 is opened on the detection frame 1, and a slide seat 6 is slidably arranged in the annular groove 101. The shaft 7 is the rotating shaft 7 of the marking part 3, which is rotatably arranged on the slide seat 6. It can separate the rotation of the marking part 3 and the revolution around the pressure shell 2, so that their respective motion states are more stable. At the same time, in the present scheme, the flexible part 5 is provided with a ring shape, and a pushing platform 8 is provided on the shaft part 7 for axial sliding along the shaft part 7. The pushing part and the shaft part 7 keyway cooperate, and the pushing platform 8 rotates synchronously with the shaft part 7. At the same time, the flexible part 5 is also provided with a ring shape, and there is a certain friction force between the flexible part 5 and the pushing platform 8. Before the workpiece is installed and gas is injected, the shaft part 7 is always in a state of self-rotation, and there is no contact between the flexible part 5 and the pushing platform 8. After the workpiece is injected with gas, the flexible part 5 deforms and expands. During the process of the internal air pressure reaching the standard, the flexible part 5 and the pushing platform 8 come into contact with each other. At this time, the rotating pushing platform 8 begins to rotate around the interface position of the workpiece due to the friction resistance of the annular flexible part 5 coaxially arranged with the annular slide groove 101. Rotation occurs, and with the cooperation of the first marking head 4, the workpiece is marked with a qualified mark. In this design, it is set that when a certain air pressure value can be maintained in the pressure shell 2, the first marking head 4 continuously circles the workpiece for marking. When the internal air pressure value decreases to a certain range, the range is set as an acceptable error, and the outer surface of the pushing platform 8 is no longer in contact with the flexible part. The pushing platform 8 drives the marking part 3 to rotate only, so that the final mark is an incomplete ring. The operator judges the airtightness fault level of the workpiece according to the completeness and length of the marking, and classifies and summarizes it. Compared with the single judgment of the yield of good and bad marking in the prior art, it can more accurately and dynamically measure the quality of the marked workpiece, and can perform more detailed and accurate product quality analysis.

[0053] Furthermore, the marking part 3 is a hollow cylinder, the pushing platform 8 is set to a cone shape and has a first cone surface 801. After the flexible part 5 abuts against the first cone surface 801, it drives the pushing platform 8 to slide. It also includes a driving block 9 that is slidably set on the shaft 7. After the pushing platform 8 slides, it drives the driving block 9 to slide. The driving block 9 has a second cone surface 901. The first marking head 4 has a sliding part 401. The sliding part 401 of the first marking head 4 is slidably set on the second cone surface 901. After the driving block 9 slides, it drives the first marking head 4 to slide in the direction away from the axis of the shaft 7.

[0054] In this embodiment, the marking member 3 is set to be a hollow cylinder, and a driving block 9 is arranged in the cavity of the hollow cylinder. The interior of the first marking head 4 is also located in the cavity of the marking member 3. The pushing platform 8 is set to be a cone-shaped, and the outer surface of the flexible portion 5 is an arc shape. When the flexible portion 5 expands, it abuts against the first cone surface 801 of the pushing platform 8, driving the pushing platform 8 to slide in the direction of the driving block 9. The second cone surface 901 of the driving block 9 then cooperates with the sliding portion 401 on the first marking head 4 to push the first marking head 4 to slide in the direction of the workpiece. The overall movement state is that after gas is injected into the workpiece and the inside of the pressure shell 2, the first marking head 4 extends out and continues to mark the surface of the workpiece until the flexible portion 5 shrinks after leakage and cancels the abutment with the pushing platform 8, and the marking stops. This embodiment can automatically mark the surface of the workpiece according to the detection state, without the need for manual active control of the first marking head 4 for marking according to the internal air pressure change, which greatly improves the detection efficiency, and makes the automation level of the device and the accuracy and timeliness of marking have been greatly improved.

[0055] Furthermore, it also includes a second marking head 10, which has the same structure as the first marking head 4, is radially slidably arranged along the rotating axis of the marking part 3, and is axially spaced from the first marking head 4 along the shaft 7. After sliding, it is used to abut or cancel the abutment with the surface of the workpiece, wherein the driving block 9 has a third conical surface 902, the second conical surface 901 and the third conical surface 902 are symmetrically arranged, and the driving block 9 is located between the first marking head 4 and the second marking head 10. After the driving block 9 slides, it drives the first marking head 4 or the second marking head 10 to slide away from the axial center of the shaft 7.

[0056] In this embodiment, a second marking head 10 is also provided. The first marking head 4 and the second marking head 10 have the same structure and are arranged for circumferential detection along the shaft portion 7, that is, the distance from the workpiece surface is the same. The marking colors of the first marking head 4 and the second marking head 10 are different, and different colors can be used to indicate different workpiece states. The first marking head 4 is used to indicate the qualified state of the workpiece, and the second marking head 10 is used to indicate the unqualified state of the workpiece. The specific action is that when the air pressure inside the workpiece is within the standard value, the first marking head 4 always leaves a mark on the workpiece. The driving block 9 itself is shuttle-shaped. When the air pressure inside the workpiece is reduced, the push table 8 is reset in the reverse direction. The first marking head 4 is retracted into the marking part 3, and the third cone surface 902 on the driving block 9 cooperates with the second marking head 10, and the second marking head 10 is extended to mark the workpiece with another color that is first continuous and then intermittent. Setting two color marking heads can determine the instability of the results caused by the discontinuity of single color marking, and can judge the airtightness state of the device itself according to the color state. The surface of an unqualified workpiece will have the continuous color of the first marking head 4 at one end and the intermittent color state of the second marking head 10 at the end. The airtightness level and air pressure leakage curve of the workpiece can be accurately judged according to the length, position and continuity of the two colors.

[0057] Furthermore, there are multiple first marking heads 4 and second marking heads 10, which are arranged circumferentially on the marking part 3, and also include a first elastic member 11. One end of the first elastic member 11 acts on the first marking head 4 or the second marking head 10, and the other end acts on the inner wall of the marking part 3, providing an axial force for the first marking head 4 or the second marking head 10 to approach or move away from the marking part 3.

[0058] In this embodiment, the first marking heads 4 are arranged in a circle, which can leave marks on the surface of the workpiece more stably, and the marks for qualified workpieces are more accurate and easy to identify, and the marks for unqualified workpieces are also more accurate. The state of internal gas leakage can be more clearly and specifically expressed through the clear two-color marks on the surface of the workpiece, which is convenient for technicians to analyze and summarize and adjust the subsequent production process. The setting of the first elastic member 11 can provide a reset force for the first marking head 4 and the second marking head 10, so that the sliding part 401 of the first marking head 4 and the sliding part 401 of the second marking head 10 are always in close contact with the second cone surface 901 or the second cone surface 901, so that the two are more sensitive and accurate to the changes in the air pressure inside the pressure chamber 201, and can prevent the two from accidentally touching the workpiece during the installation and detection process.

[0059] Furthermore, a second elastic member 12 is included, one end of the second elastic member 12 acts on one end of the marking member 3 , and the other end of the second elastic member 12 acts on one end of the pushing platform 8 to provide a force to push the pushing platform 8 away from the marking member 3 .

[0060] In this embodiment, a second elastic member 12 is provided, and the second elastic member 12 provides a restoring force for the push table 8, which is opposite to the direction of cooperation between the flexible portion 5 and the first conical surface 801, and can make the third conical surface 902 on the driving block 9 actively abut against the sliding portion 401 of the second marking head, so as to more accurately and stably drive the second marking head to mark the workpiece, and can also timely separate the first marking head from the workpiece, so that the final marking result is more accurate and stable.

[0061] Furthermore, it also includes a first gear 13 , which is rotatably disposed on the detection frame 1 and coaxially disposed with the pressure shell 2 , and a second gear 14 is disposed on the shaft 7 , and the first gear 13 is meshed with the second gear 14 .

[0062] In this embodiment, a first gear 13 and a second gear 14 are provided. Before the first conical surface 801 and the surface of the flexible portion 5 abut against each other, the first gear 13 only drives the second gear 14 to rotate. The rotation speed and transmission ratio of the first gear 13 and the second gear 14 are set so that after the first conical surface 801 and the flexible portion 5 abut against each other, the time for the shaft portion 7 to revolve once is 8 to 12 seconds as specified by the air tightness test, and the time for one rotation can be adjusted by adjusting the rotation speed according to specific needs, so that the marking head records the trajectory after rotating one full circle on the workpiece, which can prevent the result reading confusion caused by the marking head superimposing marks on the workpiece.

[0063] Furthermore, it also includes an injection molding part 15, which is arranged on one side of the detection frame 1, and the injection molding part 15 has a second mounting portion 1501. The clamping parts 16 are arranged in pairs and are lifted and slidably arranged on the detection frame 1. The first mounting portion 202 and the second mounting portion 1501 are both provided with clamping parts 16. After sliding, the two clamping parts 16 located at the first mounting portion 202 move closer to or farther away from each other, and a first clamping space 1601 is formed between the first mounting portion 202. The two clamping parts 16 located at the second mounting portion 1501 move closer to or farther away from each other, and a second clamping space 1602 is formed between the second mounting portion 1501.

[0064] In this embodiment, an injection molding part 15 is provided for injecting pressure into the workpiece for detection. A clamping part 16 is provided on the injection molding part 15 and the detection frame 1. The two ends of the workpiece are respectively mounted on the first mounting part 202 and the second mounting part 1501. After the upper and lower clamping parts 16 are brought close to each other, the two ends of the workpiece are respectively locked and fixed in the first clamping space and the second clamping space 1602, thereby avoiding leakage of the workpiece from both ends. The device can thereby more accurately detect the airtightness status of the workpiece itself and reduce the occurrence of inaccurate measurement and identification results caused by device failure or errors.

[0065] Furthermore, the annular slide groove 101 has a radial guide groove 102 and also includes a block 17, which is slidably arranged in the guide groove 102. One end of the third elastic member 18 acts on the bottom of the guide groove 102, and the other end acts on the block 17 to provide a force to keep the block 17 away from the bottom of the guide groove 102.

[0066] In this embodiment, a block 17 is provided for radial sliding along the guide groove 102 in the annular slide groove 101, and under the action of the third elastic member 18, it has a certain obstructive effect on the shaft portion 7, so that after the shaft portion 7 revolves around one circle, if it is no longer driven by the flexible member and the push platform 8, it cannot continue to revolve around one circle, that is, it can accurately ensure stable operation for one circle, and prevent the occurrence of inaccurate measurement results caused by confusion in the markings.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An airtightness detection device, characterized in that: Used to detect the air tightness of workpieces and mark them, including: Detection rack (1), A pressure-bearing shell (2), the pressure-bearing shell (2) being arranged on the detection frame (1), the pressure-bearing shell (2) comprising a pressure-bearing chamber (201) and a first mounting portion (202), the first mounting portion (202) being located at one end of the pressure-bearing chamber (201), a marking piece (3), wherein the marking piece (3) is rotatably and slidably arranged relative to the detection frame (1), and a moving track surrounds the circumference of the pressure shell (2), a first marking head (4), the first marking head (4) being arranged to slide radially along the rotating shaft of the marking member (3), and being used to abut against or cancel abutment with the surface of the workpiece after sliding; A flexible portion (5), the flexible portion (5) being arranged on the pressure-bearing shell (2), wherein the flexible portion (5) is deformed when the pressure in the pressure-bearing chamber (201) changes, and is used to detect the air tightness of the pressure-bearing chamber (201), the detection frame (1) having an annular sliding groove (101), and the flexible portion (5) is annular. a slide seat (6), the slide seat (6) being slidably disposed in the annular slide groove (101), A shaft portion (7), the shaft portion (7) being rotatably disposed on the slide seat (6), the marking member (3) being disposed on the shaft portion (7), A pushing platform (8), wherein the pushing platform (8) is slidably disposed on the shaft portion (7) and rotates with the shaft portion (7); the flexible portion (5) expands and abuts against an outer surface of the pushing platform (8), thereby driving the pushing platform (8) to rotate. The marking member (3) is in the shape of a hollow column, the pushing platform (8) is configured as a frustum and has a first frustum surface (801), and the flexible portion (5) drives the pushing platform (8) to slide after contacting the first frustum surface (801). A driving block (9), wherein the driving block (9) is slidably arranged on the shaft portion (7), and after the pushing platform (8) slides, the driving block (9) is driven to slide, the driving block (9) has a second frustum surface (901), and the first marking head (4) has a sliding portion (401), and the sliding portion (401) of the first marking head (4) is slidably arranged on the second frustum surface (901), and after the driving block (9) slides, the driving block (4) drives the first marking head (4) to slide in a direction away from the axis of the shaft portion (7), A second marking head (10), the second marking head (10) has the same structure as the first marking head (4), is radially slidably arranged along the rotating shaft of the marking component (3), and is axially spaced from the first marking head (4) along the shaft portion (7), and is used to abut or cancel abutment with the surface of the workpiece after sliding, wherein the driving block (9) has a third frustum surface (902), the second frustum surface (901) and the third frustum surface (902) are symmetrically arranged, and the driving block (9) is located between the first marking head (4) and the second marking head (10), and after the driving block (9) slides, it drives the first marking head (4) or the second marking head (10) to slide in a direction away from the axis of the shaft portion (7).

2. The airtightness detection device according to claim 1, characterized in that: The first marking heads (4) and the second marking heads (10) are both multiple and are arranged circumferentially on the marking part (3), and further include: A first elastic member (11), one end of the first elastic member (11) acts on the first marking head (4) or the second marking head (10), and the other end of the first elastic member (11) acts on the inner wall of the marking member (3), providing a force in the axial direction of the first marking head (4) or the second marking head (10) to move closer to or away from the marking member (3).

3. The airtightness detection device according to claim 1, characterized in that: Also includes: A second elastic member (12), one end of the second elastic member (12) acts on one end of the marking member (3), and the other end of the second elastic member (12) acts on one end of the pushing platform (8), providing a force to move the pushing platform (8) away from the marking member (3).

4. The airtightness detection device according to claim 1, characterized in that: Also includes: a first gear (13), the first gear (13) being rotatably disposed on the detection frame (1) and being coaxially disposed with the pressure shell (2), A second gear (14), wherein the second gear (14) is arranged on the shaft portion (7), and the first gear (13) is meshed with the second gear (14).

5. The airtightness detection device according to claim 1, characterized in that: Also includes: An injection molded part (15), the injection molded part (15) being arranged on one side of the detection frame (1), the injection molded part (15) having a second mounting portion (1501), A clamping piece (16), the clamping piece (16) is arranged in pairs and is arranged on the detection frame (1) in a lifting and sliding manner. The first mounting portion (202) and the second mounting portion (1501) are both provided with a clamping piece (16). After sliding, the two clamping pieces (16) located on the first mounting portion (202) move closer to or farther from each other, and form a first clamping space (1601) between the first mounting portion (202). The two clamping pieces (16) located on the second mounting portion (1501) move closer to or farther from each other, and form a second clamping space (1602) between the second mounting portion (1501).

6. The airtightness detection device according to claim 1, characterized in that: The annular sliding groove (101) has a radial guide groove (102) therein, and further comprises: a clamping block (17), the clamping block (17) being slidably disposed in the guide groove (102), A third elastic member (18), one end of the third elastic member (18) acts on the bottom of the guide groove (102), and the other end of the third elastic member (18) acts on the clamping block (17), providing a force to move the clamping block (17) away from the bottom of the guide groove (102).

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