Air tightness testing device

Abstract

The present disclosure is airtightness detection device, relating to electronic equipment detection technical field. The airtightness detection device comprises a base, a cover and a pressure jaw. The base has a first accommodating groove and a first gas guide pipeline. One end of the first gas guide pipeline is in communication with the first accommodating groove. The cover is detachably connected with the base in a first direction. The cover has a second accommodating groove and a second gas guide pipeline. One end of the second gas guide pipeline is in communication with the second accommodating groove. The pressure jaw is located between the base and the cover. The pressure jaw corresponds to a gap of a measured piece. The pressure jaw can move in a second direction and / or the first direction to fix the measured piece to a target position in the first accommodating groove. The included angle between the second direction and the first direction is not zero. The pressure jaw realizes the fixation of the measured piece in the airtightness detection device by applying pressure to the gap, without applying pressure to the top surface of the measured piece, thereby being suitable for the airtightness test of electronic products with small top surface area.

Description

Technical Field

[0001] This disclosure relates to the field of electronic equipment testing technology, and in particular to an airtightness testing device. Background Technology

[0002] With technological advancements, smartwatches and smart bands are increasingly becoming wearable products in the consumer electronics market. Given the application environment of electronic products, their sealing performance is crucial for their usability. Since the screen and frame of electronic products are typically bonded using adhesive, the adhesive area becomes a weak point in the seal.

[0003] In related technologies, in order to verify the bonding strength between the glued area and the screen and the mid-frame, the testing device usually uses the direct pressure method to conduct airtightness tests on the semi-finished components of the screen and the mid-frame. That is, the lower mold of the testing device supports the semi-finished components, and the upper mold of the testing device presses against the top surface of the mid-frame.

[0004] As the top surface area of ​​electronic products becomes smaller and smaller, the upper mold of the aforementioned testing device cannot effectively press the semi-finished components, resulting in the inability to effectively conduct airtightness tests on electronic products with increasingly smaller top surface areas. Utility Model Content

[0005] This disclosure provides an airtightness testing device that can solve the aforementioned technical problems existing in related technologies. The technical solution is as follows:

[0006] The airtightness testing device includes a base, a cover, and pressure claws;

[0007] The base has a first receiving groove and a first air guide pipe. One end of the first air guide pipe is connected to the first receiving groove, and the other end of the first air guide pipe is used to connect to the air pressure detection element.

[0008] The cover and the base are detachably connected in a first direction. The cover has a second receiving groove and a second air guide pipe. One end of the second air guide pipe is connected to the second receiving groove, and the other end of the second air guide pipe is used for inputting / extracting gas.

[0009] The pressure claw is located between the base and the cover, and the pressure claw corresponds to the notch of the test piece. The pressure claw can move in a second direction and / or the first direction to fix the test piece to the target position in the first receiving groove, wherein the included angle between the second direction and the first direction is not zero.

[0010] In this way, the pressure claws apply pressure to the notch to fix the test piece in the airtightness testing device without applying pressure to the top surface of the test piece, thus making it suitable for airtightness testing of electronic products with small top surface areas.

[0011] In some possible implementations, the airtightness testing device further includes a sealing ring located between the base and the cover, the sealing ring being used to prevent gas from flowing through the contact gap between the base and the cover.

[0012] In this way, the sealing ring can block the gas flow in the gap between the base and the cover, improve the sealing performance of the assembly of the base and the cover, prevent gas from flowing through the gap between the base and the cover, and thus improve the detection accuracy of the airtightness testing device.

[0013] In some possible implementations, the airtightness testing device further includes a drive member that is connected to the pressure claw in a transmission manner, the drive member being used to drive the pressure claw to move in the second direction and / or the first direction.

[0014] In this way, the clamping claw can be pressed or released on the test piece by the driving component, without the need for the operator to manually move the clamping claw, thus improving the automation level of the airtightness testing device.

[0015] In some possible implementations, the airtightness testing device further includes a limiting member located between the pressure claw and the test piece. The limiting member has a first limiting portion and a second limiting portion. The first limiting portion is used to limit the movement of the pressure claw along the first direction, and the second limiting portion is used to limit the movement of the pressure claw along the second direction.

[0016] In this way, by setting the first limiting part and the second limiting part, it is possible to effectively prevent the pressure claw from extending too far into the notch of the workpiece being tested, thereby preventing the workpiece from being deformed, cracked or scratched due to excessive squeezing by the pressure claw.

[0017] In some possible implementations, the number of pressure claws is two, and the two pressure claws are symmetrically distributed on both sides of the first receiving groove.

[0018] In this way, the two symmetrically distributed pressure claws can improve the stability of the target position of the test piece in the first receiving groove, and avoid phenomena such as warping or deflection of the test piece. At the same time, the two symmetrically distributed pressure claws can also make the stress between the test piece and the pressure claws evenly distributed, and avoid stress concentration in the local area of ​​the notch.

[0019] In some possible implementations, the airtightness testing device further includes an elastic element located between the base and the test piece, and opposite to the test piece. When the test piece is located at the target position, the elastic element is in contact with the test piece.

[0020] In this way, when the test piece is subjected to the squeezing force of the pressure claw, the bottom of the test piece gradually approaches and compresses the elastic element, causing the elastic element to deform. This ensures that the elastic element is always in close contact with the test piece, improving the sealing between the test piece and the base. It also prevents the test piece from directly contacting the base, reducing the possibility of damage to the test piece and increasing the service life of the base.

[0021] In some possible implementations, the airtightness testing device further includes a pressure plate member located on the side of the elastic member away from the base, the pressure plate member being connected to the base to restrict the movement of the elastic member.

[0022] In this way, the elastic element and the base are fixed in relative position by pressing the plate, which avoids direct connection between the elastic element and the base, thereby improving the convenience of loading, unloading and replacing the elastic element, and making it easier for maintenance personnel to inspect and maintain the airtightness testing device.

[0023] In some possible implementations, both the first and second air guide lines are cylindrical pipes, and the cross-sectional diameter of the first and second air guide lines ranges from 1 mm to 3 mm.

[0024] In this way, the cylindrical pipe provides less resistance to gas flow, and the appropriate cross-sectional dimensions of the gas guide pipe can balance the duration of the airtightness test and the required power consumption.

[0025] In some possible implementations, the pressure claws are made of polytetrafluoroethylene (PTFE).

[0026] In this way, the pressure claws have a low coefficient of friction, avoiding wear and scratches caused by the pressure claws pressing the workpiece; and polytetrafluoroethylene has good chemical stability and anti-aging properties, increasing the service life of the pressure claws.

[0027] In some possible implementations, the second direction and the first direction are perpendicular to each other.

[0028] In this way, the first and second directions, which are perpendicular to each other, help to decompose the movement of the pressure claw into two independent components, making the driving of the drive unit simpler and faster.

[0029] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of an airtightness testing device provided in an embodiment of this disclosure.

[0032] Figure 2 This is a partial schematic diagram of an airtightness detection device provided in an embodiment of this disclosure.

[0033] Figure label:

[0034] 1. Base; 11. First receiving slot; 12. First air guide pipe;

[0035] 2. Cover; 21. Second receiving slot; 22. Second air guide pipe;

[0036] 3. Pressure claws; 4. Sealing rings; 5. Driving components;

[0037] 6. Limiting component; 61. First limiting part; 62. Second limiting part;

[0038] 7. Elastic components; 8. Compressing components;

[0039] X, first direction; Y, second direction;

[0040] 100. Tested component.

[0041] The accompanying drawings have illustrated specific embodiments of this disclosure, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this disclosure to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0043] With technological advancements, smartwatches and smart bands are increasingly becoming part of the consumer electronics market. Given the application environment of electronic products, their sealing performance is crucial for their usability. Since the screen and frame of electronic products are typically bonded using adhesive, the adhesive-coated area becomes a weak point in the seal.

[0044] In related technologies, in order to verify the bonding strength between the glued area and the screen and the mid-frame, the testing device usually uses the direct pressure method to conduct an airtightness test on the semi-finished components of the screen and mid-frame (after the screen and mid-frame are glued and held under pressure and then remain still, they become a semi-finished component of screen + mid-frame, which is usually called a "three-in-one component" in the industry). That is, the lower mold of the testing device supports the semi-finished component, and the upper mold of the testing device presses the top surface of the mid-frame. The top surface refers to the side of the electronic product that faces outward and away from the skin when it is worn, which is usually the position of the display screen or decorative surface (such as the screen side of a smart bracelet).

[0045] Due to consumers' consideration of the aesthetics of electronic products, the top surface area of ​​electronic products is getting smaller and smaller. This makes it impossible for the upper mold of the above-mentioned testing device to effectively press the semi-finished components, resulting in the inability to effectively conduct airtightness tests on electronic products with increasingly smaller top surface areas.

[0046] This disclosure provides an airtightness testing device, referring to... Figure 1 As shown, the airtightness testing device includes a base 1, a cover 2, and a pressure claw 3.

[0047] The base 1 has a first receiving groove 11 and a first air guide pipe 12. The first receiving groove 11 is used to receive the test piece 100. One end of the first air guide pipe 12 is connected to the first receiving groove 11, and the other end of the first air guide pipe 12 is used to connect to the air pressure detection element.

[0048] The cover 2 and the base 1 are detachably connected in the first direction X. The cover 2 has a second receiving groove 21 and a second air guide pipe 22. One end of the second air guide pipe 22 is connected to the second receiving groove 21, and the other end of the second air guide pipe 22 is used for inputting / extracting gas.

[0049] The pressure claw 3 is located between the base 1 and the cover 2. The pressure claw 3 corresponds to the notch of the test piece 100. The pressure claw 3 can move in the second direction Y and / or the first direction X to fix the test piece 100 to the target position in the first receiving groove 11, wherein the included angle between the second direction Y and the first direction X is not zero.

[0050] The notch of the test component 100 refers to the opening structure that the test component 100 itself has. For example, when the test component 100 is a smartwatch, the notch can be the quick-release watch band installation location; for another example, when the test component 100 is a smartphone, the notch can be the charging port or speaker port of the mid-frame.

[0051] This disclosure does not specifically limit the size, shape, and position of the pressure claw 3, but can be matched and set according to the size, shape, and position of the notch of the workpiece 100 being measured.

[0052] In this way, the pressure claw 3 fixes the test piece 100 in the air tightness testing device by applying pressure to the notch of the test piece 100, without applying pressure to the top surface of the test piece 100, thus making it suitable for air tightness testing of electronic products with small top surface area.

[0053] In some embodiments, the second direction Y and the first direction X are perpendicular to each other. In this way, the perpendicular first direction X and the second direction Y help to decompose the movement of the pressure claw 3 into two independent components, which makes the driving of the drive member 5 simpler and faster.

[0054] Wherein, the first direction X is the connection direction between the base 1 and the cover 2, for example, the thickness direction of the smartwatch, and the second direction Y is the extension direction of the notch of the tested part 100, for example, the length direction of the smartwatch or the extension direction of the strap installation position.

[0055] In some embodiments, the pressure claw 3 is made of polytetrafluoroethylene (PTFE). First, PTFE has an extremely low coefficient of friction (typically 0.04-0.1), and the self-lubricating properties of the pressure claw 3 reduce frictional wear between the pressure claw 3 and the workpiece 100, lowering the risk of scratching the workpiece 100. Second, PTFE has good chemical stability and anti-aging properties, allowing the pressure claw 3 to remain stable in the working environment of the airtightness testing device. Third, PTFE does not release any precipitates or produce particulate contamination, preventing debris from the pressure claw 3 from damaging the workpiece 100.

[0056] In some embodiments, there are two pressure claws 3, which are symmetrically distributed on both sides of the first receiving groove 11.

[0057] The symmetrically distributed clamping claws 3 ensure that the clamping force is applied evenly on both sides of the workpiece 100, counteracting the torque that may be caused by asymmetrical clamping, and ensuring that the workpiece 100 maintains the preset posture during the measurement process, avoiding phenomena such as warping or deflection. At the same time, the symmetrically distributed clamping claws 3 also ensure that the stress between the workpiece 100 and the clamping claws 3 is evenly distributed, avoiding stress concentration in local areas of the notch.

[0058] In some embodiments, the first air guide line 12 and the second air guide line 22 are both cylindrical pipes.

[0059] Using cylindrical pipes has two advantages. First, the cross-sectional area of ​​a cylindrical pipe is constant, resulting in minimal resistance during gas flow and reducing eddy current losses in the gas guide pipe. Second, the geometric symmetry of a cylindrical gas guide pipe ensures uniform circumferential stress distribution under internal pressure or external mechanical force, making it less prone to local deformation or breakage and avoiding stress concentration at the corners of pipes with other structures.

[0060] Meanwhile, the processing technology of cylindrical air guide pipes is relatively mature and the material utilization rate is high, which makes the production cost of air tightness testing devices low.

[0061] The cross-sectional diameter of the first air guide pipe 12 and the second air guide pipe 22 ranges from 1mm to 3mm. If the cross-sectional diameter is too large (e.g., greater than 3mm), it will result in a higher power consumption of the blowing / squeezing element connected to the air tightness testing device. If the cross-sectional diameter is too small (e.g., less than 1mm), it will result in a longer time required for blowing / squeezing, thus leading to lower working efficiency of the air tightness testing device.

[0062] In some embodiments, the airtightness testing device further includes a sealing ring 4, which is located between the base 1 and the cover 2, and is used to block gas from flowing through the contact gap between the base 1 and the cover 2.

[0063] After the base 1 and the cover 2 are connected along the first direction X, there is still a certain gap between the contact surfaces of the base 1 and the cover 2. External gas can enter the first receiving tank 11 and the second receiving tank 21 through the gap, and / or the gas in the first receiving tank 11 and the second receiving tank 21 can be discharged to the external environment of the airtightness detection device through the gap, which leads to poor detection accuracy of the airtightness detection device.

[0064] A sealing ring 4 is provided between the base 1 and the cover 2. The sealing ring 4 is a flexible element. As the base 1 and the cover 2 approach each other in the first direction X, the sealing ring 4 is continuously squeezed by the base 1 and the cover 2 and undergoes elastic deformation. After the base 1 and the cover 2 are connected, the squeezed sealing ring 4 effectively fills the connection gap between the base 1 and the cover 2.

[0065] In this way, the sealing ring 4 can block the gas flow through the connection gap between the base 1 and the cover 2, improve the sealing performance of the assembly formed by the base 1 and the cover 2, prevent gas from flowing through the connection gap between the base 1 and the cover 2, and thus improve the detection accuracy of the airtightness detection device.

[0066] In some embodiments, the airtightness testing device further includes a drive member 5, which is connected to the pressure claw 3 via a transmission connection. The drive member 5 is used to drive the pressure claw 3 to move in the second direction Y and / or the first direction X. In this way, the airtightness testing device can achieve the clamping or loosening of the pressure claw 3 on the test piece 100 through the drive member 5, without the need for manual operation of the pressure claw, thus improving the automation level of the airtightness testing device.

[0067] This disclosure does not limit the specific structure of the drive component 5, and it can be matched and set according to parameters such as the design space, assembly process and manufacturing cost of the drive component 5. For example, the drive component 5 may include power components (e.g., servo motor, stepper motor, coupling, reducer), transmission mechanisms (e.g., ball screw, gear / rack, linkage mechanism) and auxiliary components (e.g., guide components, fasteners, bearings), etc.

[0068] In some embodiments, refer to Figure 2 As shown, the airtightness testing device also includes a limiting member 6, which is located between the pressure claw 3 and the test piece 100. The limiting member 6 has a first limiting part 61 and a second limiting part 62. The first limiting part 61 is used to limit the movement of the pressure claw 3 along the first direction X, and the second limiting part 62 is used to limit the movement of the pressure claw 3 along the second direction Y.

[0069] In this way, by setting the first limiting part 61, the pressure claw 3 is prevented from excessively pressing the test piece 100 in the first direction X, and by setting the second limiting part 62, the pressure claw 3 is prevented from excessively abutting the test piece 100 in the second direction Y. This effectively prevents the pressure claw 3 from excessively extending into the notch of the test piece 100, and avoids the test piece 100 from deforming, cracking or scratching due to excessive pressure from the pressure claw 3.

[0070] This disclosure does not specifically limit the size and shape of the first limiting part 61 and the second limiting part 62, but can be matched and set according to the size and shape of the pressure claw 3.

[0071] In some embodiments, the airtightness testing device further includes an elastic element 7, which is located between the base 1 and the test piece 100 and is opposite to the test piece 100. When the test piece 100 is in the target position, the elastic element is in contact with the test piece 100.

[0072] When the test piece 100 is subjected to the squeezing force of the pressure claw 3, the bottom of the test piece 100 gradually approaches and compresses the elastic element 7, causing the elastic element 7 to deform. This ensures that the elastic element 7 is always in close contact with the test piece 100, improving the sealing between the test piece 100 and the base 1. It also prevents the test piece 100 from directly contacting the base 1, reducing the possibility of damage to the test piece 100 and increasing the service life of the base 1.

[0073] In some embodiments, refer to Figure 1 As shown, the airtightness testing device also includes a pressing element 8, which is located on the side of the elastic element 7 away from the base 1. The pressing element 8 is connected to the base 1 (e.g., screw connection) to restrict the movement of the elastic element 7.

[0074] In this way, the elastic element 7 and the base 1 are fixed in relative position by the pressing element 8, which can avoid the elastic element 7 being directly connected to the base 1, thereby improving the convenience of loading, unloading and replacing the elastic element 7, and facilitating the maintenance personnel to inspect and maintain the airtightness testing device.

[0075] In this disclosure, the working process of the airtightness testing device is as follows:

[0076] The first step is that the pressure claw 3 moves and applies a squeezing force to the notch of the test piece 100 so that the test piece 100 is fixed to the target position in the first receiving groove 11 of the base 1, and the first side of the test piece 100 and the first receiving groove 11 form a closed cavity.

[0077] In the second step, the cover 2 is connected to the base 1, and the second side of the test piece 100 and the second receiving groove 21 form a closed cavity, wherein the first side and the second side are opposite sides of the test piece 100.

[0078] The third step is to connect the first air guide pipe 11 to the air pressure detection element and the second air guide pipe 22 to the air blowing element. The air blowing element fills the second receiving tank 21 with air to the target air pressure value, and the air pressure detection element determines whether there is a gas leakage problem in the tested component 100.

[0079] For example: Inflate the second receiving tank 21 to the target pressure value, and if the pressure value of the second receiving tank 21 is greater than the pressure value of the first receiving tank 11, and the pressure detection element detects a gradual increase in the pressure value of the first receiving tank 11, it indicates a leakage problem in the tested component 100. If the pressure detection element detects that the pressure value of the first receiving tank 11 remains basically unchanged or the degree of change is less than the target range, it indicates that the airtightness of the tested component 100 is good. Conversely, if the second receiving tank 21 cannot be inflated to the target pressure value within the target time period, it indicates a leakage problem in the tested component 100 or a problem with the airtightness detection device. The testing personnel need to check the airtightness detection device and reassemble the tested component 100.

[0080] In some other embodiments, in the third step, the first air guide 11 is connected to the air pressure detection element, and the second air guide 22 is connected to the suction element. The suction element draws air from the second receiving tank 21 to the target air pressure value and determines whether the tested component 100 has a gas leakage problem based on the air pressure detection element.

[0081] For example: If the second receiving tank 21 is evacuated to the target pressure value, and the pressure value of the second receiving tank 21 is less than the pressure value of the first receiving tank 11, and the pressure detection element detects that the pressure value of the first receiving tank 11 is gradually decreasing, it indicates that the tested component 100 has a leakage problem. If the pressure detection element detects that the pressure value of the first receiving tank 11 remains basically unchanged or the degree of change is less than the target range, it indicates that the tested component 100 has good airtightness. Conversely, if the second receiving tank 21 cannot be evacuated to the target pressure value within the target time period, it indicates that the tested component 100 has a leakage problem or that the airtightness detection device is faulty. The testing personnel need to check the airtightness detection device and reassemble the tested component 100.

[0082] On the one hand, the pressure claw 3 fixes the test piece 100 in the air tightness testing device by applying pressure to the notch of the test piece 100 without applying pressure to the top surface of the test piece 100, thus making it suitable for air tightness testing of electronic products with a small top surface area.

[0083] On the other hand, the stress location of the test piece 100 is not on the surface, thereby avoiding damage to the surface of the test piece 100 during the airtightness test and thus reducing the appearance defect rate of the test piece 100.

[0084] Meanwhile, the air tightness test using the negative pressure of the suction element has a higher detection rate of minor leaks in the glue circuit than the air tightness test using the positive pressure of the blowing element.

[0085] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0086] It is understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0087] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0088] It is further understood that the terms “center,” “longitudinal,” “lateral,” “front,” “rear,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0089] It is further understood that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the two components; they can refer to a direct connection between two components without the presence of other components, or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0090] It is further understood that although operations are described in a specific order in the accompanying drawings in the embodiments of this disclosure, this should not be construed as requiring these operations to be performed in the specific order or serial order shown, or requiring all of the shown operations to be performed to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous.

[0091] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the solutions disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the scope of the claims.

[0092] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. An airtightness testing device, characterized in that, The airtightness testing device includes a base (1), a cover (2), and pressure claws (3); The base (1) has a first receiving groove (11) and a first air guide pipe (12). One end of the first air guide pipe (12) is connected to the first receiving groove (11), and the other end of the first air guide pipe (12) is used to connect to the air pressure detection element. The cover (2) is detachably connected to the base (1) in the first direction (X). The cover (2) has a second receiving groove (21) and a second air guide pipe (22). One end of the second air guide pipe (22) is connected to the second receiving groove (21), and the other end of the second air guide pipe (22) is used for inputting / extracting gas. The pressure claw (3) is located between the base (1) and the cover (2). The pressure claw (3) corresponds to the notch of the test piece (100). The pressure claw (3) can move in the second direction (Y) and / or the first direction (X) to fix the test piece (100) to the target position in the first receiving groove (11). The angle between the second direction (Y) and the first direction (X) is not zero.

2. The airtightness testing device according to claim 1, characterized in that, The airtightness testing device also includes a sealing ring (4), which is located between the base (1) and the cover (2). The sealing ring (4) is used to block gas from flowing through the contact gap between the base (1) and the cover (2).

3. The airtightness testing device according to claim 1, characterized in that, The airtightness testing device further includes a drive component (5), which is connected to the pressure claw (3) in a transmission manner. The drive component (5) is used to drive the pressure claw (3) to move in the second direction (Y) and / or the first direction (X).

4. The airtightness testing device according to claim 1, characterized in that, The airtightness testing device further includes a limiting member (6), which is located between the pressure claw (3) and the test piece (100). The limiting member (6) has a first limiting part (61) and a second limiting part (62). The first limiting part (61) is used to limit the movement of the pressure claw (3) along the first direction (X), and the second limiting part (62) is used to limit the movement of the pressure claw (3) along the second direction (Y).

5. The airtightness testing device according to claim 1, characterized in that, The number of the pressure claws (3) is two, and the two pressure claws (3) are symmetrically distributed on both sides of the first receiving groove (11).

6. The airtightness testing device according to claim 1, characterized in that, The airtightness testing device also includes an elastic element (7), which is located between the base (1) and the test piece (100) and is opposite to the test piece (100). When the test piece (100) is located at the target position, the elastic element (7) is in contact with the test piece (100).

7. The airtightness testing device according to claim 6, characterized in that, The airtightness testing device also includes a pressing element (8), which is located on the side of the elastic element (7) away from the base (1). The pressing element (8) is connected to the base (1) to restrict the movement of the elastic element (7).

8. The airtightness testing device according to claim 1, characterized in that, Both the first air guide pipe (12) and the second air guide pipe (22) are cylindrical pipes, and the cross-sectional diameter of the first air guide pipe (12) and the second air guide pipe (22) ranges from 1mm to 3mm.

9. The airtightness testing device according to claim 1, characterized in that, The pressure claw (3) is made of polytetrafluoroethylene.

10. The airtightness testing device according to claim 1, characterized in that, The second direction (Y) and the first direction (X) are perpendicular to each other.

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