Air tightness testing apparatus and method of testing

Abstract

This invention provides an airtightness testing device and method, belonging to the technical field of sealing test. It includes a testing unit and a transport unit. The testing unit comprises a testing frame, a docking structure within the testing frame, and an inflation structure. The docking structure includes two docking discs arranged opposite each other along a first direction, a first telescopic member fixed between the docking discs and the testing frame, and multiple air guiding components disposed on the docking discs. Each docking disc has an air guiding cavity. The inflation structure injects gas into the air guiding cavity. The docking disc also has multiple grooves corresponding to the air guiding components. Each air guiding component includes an air guiding column sliding in the groove and a first elastic member fixed between the air guiding column and the docking disc. The air guiding column has an air guiding groove communicating with the air guiding cavity. The first elastic member has a pre-tightening force that causes the air guiding column to move outward from the docking disc. The transport unit is used to transport the test piece between the two docking discs. This invention reduces testing costs.

Description

Technical Field

[0001] This invention belongs to the technical field of airtightness testing, specifically relating to an airtightness testing device and its testing method. Background Technology

[0002] Air tightness testing is a crucial step in industrial production, especially in fields such as automotive parts, medical devices, electronic components, and packaging products, where its sealing performance directly affects the safety, reliability, and service life of the products.

[0003] Currently, when using the differential pressure method for air tightness testing, it is usually necessary to connect and seal the inflation port of the testing equipment with the inflation port of the part under test, and then pressurize, hold pressure and measure. Existing devices mostly use fixed-size connectors, with sealing rings or clamps to achieve a sealed connection.

[0004] However, due to the diverse specifications of the test pieces, their inflation port diameters are often inconsistent. Traditional connectors have a simple structure and poor adaptability, making it difficult to match test pieces of different diameters during the inflation docking stage. Test pieces of different diameters require the preparation of different sealing fixtures, which increases the testing cost. Summary of the Invention

[0005] This invention provides an airtightness testing device and method, aiming to solve the technical problem that different sealing fixtures need to be prepared for test parts of different diameters, which increases the testing cost.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: to provide an airtightness testing device and a testing method thereof, comprising:

[0007] In a first aspect, embodiments of the present invention provide an airtightness testing device, comprising:

[0008] The detection unit includes a detection frame, a docking structure disposed within the detection frame, and an inflation structure. The docking structure includes two docking discs arranged opposite each other along a first direction, a first telescopic member fixed between the docking discs and the detection frame, and multiple air guiding components disposed on the docking discs. Each docking disc has an air guiding cavity, and the inflation structure injects gas into the air guiding cavity. Each docking disc also has multiple sliding grooves corresponding to the air guiding components. The first telescopic member extends and retracts along the first direction. Each air guiding component includes an air guiding column sliding in the sliding groove and a first elastic member fixed between the air guiding column and the docking disc. The air guiding column moves along the first direction and has an air guiding groove communicating with the air guiding cavity. The first elastic member has a pre-tightening force that causes the air guiding column to move outward from the docking disc.

[0009] A transport unit, connected to the testing frame, is used to transport the test piece between the two docking trays.

[0010] In conjunction with the first aspect, in one possible implementation, the air guide column has multiple air expansion grooves on the periphery of the air guide groove, the air expansion grooves are connected to the air guide groove, the air expansion grooves are provided with air plugs, and the inner wall of the air expansion grooves is provided with a storage groove for receiving the air plugs.

[0011] The air guide column has an annular displacement cavity, which is connected to multiple receiving slots, and a displacement unit is provided in the displacement cavity;

[0012] The shifting unit includes:

[0013] A displacement component is fixedly connected to the inner wall of the displacement cavity, and the displacement component has a displacement seat that corresponds one-to-one with the air plug;

[0014] Multiple displacement blocks are connected one-to-one with the displacement seat, and the air-blocking plug has a pressure-receiving surface for the displacement blocks to press against; and

[0015] Multiple second elastic members are provided, each corresponding to one of the air-blocking plugs. The second elastic members are fixed between the air-blocking plugs and the air guide column. The second elastic members have a pre-tightening force that causes the air-blocking plugs to move into the air expansion groove.

[0016] In conjunction with the first aspect, in one possible implementation, the shifting unit further includes an adjustment structure corresponding one-to-one with the shifting seat;

[0017] The adjustment structure includes:

[0018] A base is fixedly connected to the displacement seat, and the base has an adjustment groove for the displacement block to slide.

[0019] The third elastic element is fixed between the base and the displacement block, and the third elastic element has a preload force that causes the displacement block to move toward the inside of the adjustment groove.

[0020] An adjustable airbag is disposed within the adjustable groove; and

[0021] A first pneumatic component is connected to the regulating airbag, and the first pneumatic component is used to inflate the regulating airbag or deflat the regulating airbag.

[0022] In conjunction with the first aspect, in one possible implementation, the inner wall of the chute is provided with an annular displacement cavity, the air guiding assembly further includes a displacement disk disposed in the displacement cavity, the air guiding column is slidably connected to the displacement disk, and the displacement cavity is also provided with a displacement unit;

[0023] The displacement unit includes:

[0024] A displacement member, fixedly connected to the inner wall of the displacement cavity, the displacement member having at least two displacement seats; and

[0025] At least two second telescopic members are provided one-to-one with the displacement seat. The second telescopic members extend and retract radially along the displacement plate. The telescopic members of the second telescopic members are connected to the displacement plate.

[0026] In conjunction with the first aspect, in one possible implementation, a sealing cavity is formed in the inner wall of the slide groove, a sealing ring is fixedly connected to the displacement plate, the sealing ring extends into the sealing cavity, a sealing airbag is provided on the side of the sealing ring away from the displacement plate, and a second pneumatic component communicating with the sealing airbag is provided in the sealing ring, the second pneumatic component being used to inflate the sealing airbag or evacuate the sealing airbag.

[0027] In conjunction with the first aspect, in one possible implementation, the sealing airbag includes two semi-circular airbags, which are staggered and a pulley is provided between them, the pulley being connected to the sealing ring.

[0028] In conjunction with the first aspect, in one possible implementation, the sealing ring is rotatably connected to a turntable corresponding to each pulley. The rotation axis of the turntable is perpendicular to the surface of the displacement disk. A wheel seat for mounting the pulley is slidably mounted on the turntable. The wheel seat moves along the axial direction of the displacement disk. A fourth elastic member is fixedly connected between the wheel seat and the turntable. The fourth elastic member has a pre-tightening force that causes the pulley to abut against the inner wall of the sealing cavity. The outer wall of the pulley has multiple suction ports. A third pneumatic member is provided inside the pulley and communicates with the suction ports. The third pneumatic member is used to evacuate air from the suction ports.

[0029] In conjunction with the first aspect, in one possible implementation, the transport unit includes:

[0030] A transport aircraft, arranged along a second direction, having multiple transport seats, each transport seat having a transport state connected to the transport aircraft and a detection state separated from the transport aircraft;

[0031] A reversing seat is disposed inside the detection frame, and the reversing seat rotates about the vertical direction as its axis of rotation;

[0032] A reversing structure, drively connected to the reversing seat, and used to drive the reversing structure to rotate; and

[0033] A lifting structure is provided on the reversing seat. The lifting structure includes a lifting seat and a lifting member fixed between the lifting seat and the reversing seat. The lifting member extends and retracts in the vertical direction. The lifting seat is adsorbed and connected to the transport seat.

[0034] In conjunction with the first aspect, in one possible implementation, the transport unit further includes a plurality of positioning structures that are one-to-one corresponding to the transport seat;

[0035] The positioning structure includes:

[0036] The positioning seat is fixedly connected to the transport seat;

[0037] Two clamping assemblies are disposed opposite to each other on both sides of the transport seat along the first direction. Each clamping assembly includes two positioning plates disposed opposite to each other on both sides of the positioning seat along the second direction, and a plurality of clamping wheels disposed on the positioning plates. The positioning plates are rotatably connected to the positioning seat and rotate about the first direction as a rotation axis.

[0038] Multiple limiting pieces are provided, each corresponding to a positioning piece. One end of each limiting piece is fixedly connected to the positioning piece, and the other end of each limiting piece is fixedly connected to the positioning seat.

[0039] The airtightness testing equipment provided by this invention, compared with existing technologies, utilizes the cooperation of multiple independently sliding air guide columns and a first elastic element to achieve automatic adaptation to the size of the air inlet. Each air guide column can abut against the end face of the air inlet of the test piece under the action of elasticity, establishing a uniform and reliable preliminary pressure interface for subsequent sealing testing. This not only significantly improves the versatility and testing efficiency of the equipment, but also greatly reduces tooling costs and downtime caused by product changeovers.

[0040] Secondly, embodiments of the present invention also provide an airtightness detection method, the steps of which are as follows:

[0041] S10. Set the corresponding test program on the airtightness testing equipment according to the standard test parameters, and set parameters such as inflation time, pressure holding time, test time, exhaust time, purging time, pressure threshold, and position of the tested part.

[0042] S20. After the item to be inspected is placed in the transport unit, a barcode scanning operation is performed. After the software system receives the information of the item to be inspected, the inspection unit starts and enters the inspection program.

[0043] S30, The detection unit performs the detection procedure, which includes one vacuuming, vacuum pressure holding, air filling, air tightness test, exhaust, secondary vacuuming, air filling, and purging.

[0044] S40. When the airtightness of the inspected part is determined to be unqualified, the system will issue an alarm and transmit the information to the next process.

[0045] The airtightness testing method provided by this invention, compared with existing technologies, effectively eliminates residual air and impurities in the internal cavity and pipelines of the workpiece under test through a vacuum stage, significantly reducing measurement errors caused by impure gases or temperature changes, and improving the fundamental accuracy and repeatability of the test. The purging step after the gas filling test ensures that no test gas remains in the workpiece, meeting the requirements of downstream processes or safety regulations. Simultaneously, the vacuum degree of the workpiece under test can also be detected during the vacuum stage. If the vacuum degree is found to be insufficient during the vacuum stage, the workpiece is directly determined to be unqualified, eliminating the need for gas filling testing, thereby saving gas resources. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the airtightness testing device according to an embodiment of the present invention;

[0047] Figure 2 This is a structural schematic diagram illustrating the installation position of the detection unit in an embodiment of the present invention;

[0048] Figure 3 for Figure 2 A magnified view of part A in the middle;

[0049] Figure 4 This is a partial cross-sectional view illustrating the detection unit and the displacement unit in an embodiment of the present invention;

[0050] Figure 5 This is a cross-sectional view of an embodiment of the present invention, illustrating the displacement cavity, receiving groove, air expansion groove, and air guiding groove;

[0051] Figure 6 for Figure 4 A magnified view of part B in the middle section;

[0052] Figure 7 This is a structural schematic diagram illustrating the movement mode of the air plug in an embodiment of the present invention;

[0053] Figure 8 This is a schematic diagram illustrating the sealing method of the displacement cavity in an embodiment of the present invention;

[0054] Figure 9 This is a cross-sectional view illustrating the pulley, the suction port, and the fourth elastic element in an embodiment of the present invention;

[0055] Figure 10 This is a schematic diagram illustrating the structure of a transport unit according to an embodiment of the present invention.

[0056] Explanation of reference numerals in the attached figures:

[0057] 10. Detection unit; 101. Detection frame; 102. Docking plate; 1021. Air guide chamber; 1022. Slide groove; 1023. Displacement chamber; 1024. Sealing chamber; 103. First telescopic component; 104. Air guide column; 1041. Air guide groove; 1042. Air expansion groove; 1043. Air plug; 1044. Storage groove; 1045. Displacement chamber; 105. First elastic component; 106. Displacement plate; 1061. Sealing ring; 1062. Semi-arc airbag; 1063. Pulley; 10631. Adsorption port; 1064. Turntable; 1065. Wheel seat; 1066. Fourth elastic component;

[0058] 20. Transport unit; 201. Transport aircraft; 2021. Transport seat; 202. Reversing seat; 203. Lifting seat; 204. Positioning seat; 205. Positioning plate; 206. Clamping wheel; 207. Limiting plate;

[0059] 30. Displacement unit; 301. Displacement component; 302. Displacement block; 303. Second elastic component; 304. Base; 305. Third elastic component; 306. Adjustable airbag;

[0060] 40. Displacement unit; 401. Displacement component; 402. Second telescopic component. Detailed Implementation

[0061] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0062] Please refer to the following: Figures 1 to 10The airtightness testing device of the present invention will be described below. An airtightness testing device includes a testing unit 10 and a transport unit 20. The testing unit 10 includes a testing frame 101, a docking structure disposed within the testing frame 101, and an inflation structure. The docking structure includes two docking plates 102 disposed opposite each other along a first direction, a first telescopic member 103 fixed between the docking plates 102 and the testing frame 101, and a plurality of air guiding components disposed on the docking plates 102. An air guiding cavity 1021 is formed within the docking plate 102. The inflation structure is used to inject gas into the air guiding cavity 1021. The docking plate 102 also has a plurality of components corresponding to the air guiding components. The corresponding slide groove 1022, the first telescopic member 103 extends and retracts along the first direction, the air guiding assembly includes an air guiding column 104 slidably disposed in the slide groove 1022 and a first elastic member 105 fixed between the air guiding column 104 and the docking plate 102, the air guiding column 104 moves along the first direction, the air guiding column 104 has an air guiding groove 1041 communicating with the air guiding cavity 1021, the first elastic member 105 has a pre-tightening force that causes the air guiding column 104 to move outward of the docking plate 102; the transport unit 20 is connected to the testing frame 101 and is used to transport the test piece to the two docking plates 102.

[0063] It should be noted that the testing rack 101 has a liftable door panel. The door panel rises to allow the test pieces to enter and exit, and the door panel falls to form a sealed chamber inside the testing rack 101. The airtightness testing equipment also includes an exhaust unit connected to the inside of the testing rack 101. The exhaust unit collects the gas discharged or leaked during testing for centralized treatment. This is prior art and will not be described in detail in this application.

[0064] The airtightness testing device provided in this embodiment operates starting with the transport unit 20, which is responsible for transporting the test piece to a predetermined testing position between two docking plates 102. Subsequently, the first telescopic member 103 (e.g., a cylinder or electric push rod) is activated, driving the two docking plates 102 to move synchronously towards each other, bringing the air guide columns 104 mounted on the two plates closer to the test piece. At the moment of contact between the air guide column 104 and the test piece, due to the different actual sizes of the air inlets of the test pieces, the individual air guide columns 104 are not simultaneously obstructed; supported by the preload of the first elastic member 105 (e.g., a spring), each air guide column 104 can independently slide and retract within its corresponding groove 1022, thereby adaptively adjusting its extension length until the end faces of all air guide columns 104 are in contact with the end faces of the air inlets.

[0065] When the mating discs 102 are closed and pressed against the test piece, the inflation structure begins to operate, injecting test gas at a set pressure into the air guide cavity 1021 that runs through the two mating discs 102. After the air guide cavity 1021 is filled, the gas flows into the sealed inner cavity of the test piece through the air guide groove 1041 channel opened inside each air guide column 104 and from the outlet on the end face of each air guide column 104.

[0066] Afterward, the equipment enters the standard differential pressure testing process: the gas source is shut off and pressure is maintained, and the airtightness is monitored and assessed by a sensor (HD-830-2 nitrogen-hydrogen leak detector). After the test is completed, the gas is discharged, the first telescopic component 103 drives the docking plate 102 to reset, and the transport unit 20 moves the tested workpiece out and sends it into the next cycle.

[0067] Compared to existing technologies, this design abandons the traditional approach of requiring customized sealing fixtures for each workpiece size. By utilizing multiple independently sliding air guide columns 104 in conjunction with the first elastic element 105, it achieves automatic adaptation to the size of the air inlet. When the docking plate 102 closes under the drive of the first telescopic element 103, each air guide column 104 can abut against the air inlet end face of the workpiece under the action of elasticity. Even with ports of varying diameters or slight unevenness, it ensures effective contact at each air guide point, establishing a uniform and reliable initial pressure interface for subsequent sealing testing. This significantly improves the versatility and testing efficiency of the equipment, and greatly reduces tooling costs and downtime caused by product changeovers.

[0068] In some embodiments, see Figure 4 and Figure 5 The air guide column 104 has multiple expansion grooves 1042 formed around the air guide groove 1041. The expansion grooves 1042 are connected to the air guide groove 1041. An air plug 1043 is provided in the expansion groove 1042, and a receiving groove 1044 for receiving the air plug 1043 is formed on the inner wall of the expansion groove 1042. An annular displacement cavity 1045 is formed in the air guide column 104, and the displacement cavity 1045 is connected to the multiple receiving grooves 1044. A displacement unit 30 is provided in the displacement cavity 1045. The shifting unit 30 includes a shifting member 301, a plurality of shifting blocks 302, and a plurality of second elastic members 303; the shifting member 301 is fixedly connected to the inner wall of the shifting cavity 1045, and the shifting member 301 has a shifting seat corresponding to the air-blocking plug 1043; the plurality of shifting blocks 302 are connected to the shifting seats in a corresponding manner, and the air-blocking plug 1043 has a pressure-bearing surface for the shifting blocks 302 to squeeze; the plurality of second elastic members 303 correspond to the air-blocking plug 1043 in a corresponding manner, and the second elastic members 303 are fixedly connected between the air-blocking plug 1043 and the air guide column 104, and the second elastic members 303 have a pre-tightening force that causes the air-blocking plug 1043 to move into the air-expanding groove 1042.

[0069] During the inflation and pressure holding stages, each plug 1043 is firmly pressed against the port of the expansion groove 1042 by the pre-tightening force of its corresponding second elastic element 303 (such as a miniature spring), sealing the inner channel of the expansion groove 1042. The test gas can only enter the test piece through the controlled main passage of the guide groove 1041. If it is necessary to speed up the inflation, the shifting element 301 (annular guide rail) is activated to drive the shifting block 302 to move. During the movement, the contact point between the shifting block 302 and the pressure surface is different. At the same time, in conjunction with the second elastic element 303, the plug 1043 extends into the expansion groove 1042 to different depths, thereby controlling different inflation areas. This allows the test gas to be rapidly injected into the test piece simultaneously from the axial outlet of the guide groove 1041 and the sides of multiple circumferentially distributed expansion grooves 1042, thereby improving the intake efficiency.

[0070] In some embodiments, see Figure 4 and Figure 6 The shifting unit 30 also includes an adjustment structure that corresponds one-to-one with the shifting seat.

[0071] The adjustment structure includes a base 304, a third elastic member 305, an adjustment airbag 306, and a first pneumatic member; the base 304 is fixedly connected to the shifting seat, and the base 304 has an adjustment groove for the shifting block 302 to slide; the third elastic member 305 is fixedly connected between the base 304 and the shifting block 302, and the third elastic member 305 has a pre-tightening force that causes the shifting block 302 to move inward toward the adjustment groove; the adjustment airbag 306 is disposed in the adjustment groove; the first pneumatic member is connected to the adjustment airbag 306, and the first pneumatic member is used to inflate the adjustment airbag 306 or to depress the adjustment airbag 306.

[0072] The first pneumatic component (air pump) is activated to inflate the corresponding regulating airbag 306. As the gas is injected, the regulating airbag 306 gradually expands, pushing the shift block 302 to slide outward along the regulating groove until the shift block 302 comes into contact with the pressure surface. At this time, the position of the corresponding air plug 1043 can be adjusted through the shift unit 30. After the first pneumatic component is activated to extract the gas from the corresponding regulating airbag 306, the regulating airbag 306 gradually contracts. Under the pre-tightening force of the third elastic component 305, the shift block 302 is retracted into the regulating groove, thereby disengaging the shift block 302 from the pressure surface. At this time, the position of the corresponding air plug 1043 cannot be adjusted through the shift unit 30.

[0073] By inflating and deflating the regulating airbag 306, the position of the corresponding air plug 1043 can be adjusted through the shifting unit 30, thereby achieving unified or independent control of the air plug 1043.

[0074] In some embodiments, see Figure 4The inner wall of the slide groove 1022 is provided with an annular displacement cavity 1023. The air guiding assembly also includes a displacement disk 106 disposed in the displacement cavity 1023. The air guiding column 104 is slidably connected to the displacement disk 106. The displacement cavity 1023 is also provided with a displacement unit 40.

[0075] The displacement unit 40 includes a displacement member 401 and at least two second telescopic members 402. The displacement member 401 is fixed to the inner wall of the displacement cavity 1023 and has at least two displacement seats. The second telescopic members 402 are correspondingly disposed on the displacement seats. The second telescopic members 402 extend and retract radially along the displacement disk 106 and the telescopic members of the second telescopic members 402 are connected to the displacement disk 106.

[0076] Each air guide column 104 is not directly and rigidly fixed to the docking plate 102, but passes through a movable displacement plate 106, and relative movement is allowed between the displacement plate 106 and the docking plate 102.

[0077] The positioning disk 106 is nested in the positioning cavity 1023. When it is determined that the position of a certain air guide column 104 needs to be adjusted (after the disk 102 and the test piece are in contact, if the test piece can only cover part of the air guide groove 1041, the position of the air guide column 104 needs to be adjusted to avoid gas leakage), the corresponding positioning unit 40 is activated. The core of the positioning unit 40 is at least two independently controlled second telescopic components 402 (such as micro servo cylinders, piezoelectric ceramic actuators, or shape memory alloy drivers). These second telescopic components 402 use the positioning seat on the positioning component 401 as the fixed base 304, and their output ends are directly connected to the corresponding positions of the positioning disk 106.

[0078] By controlling the different extension or retraction amounts of these second telescopic members 402, a pushing or pulling force can be applied to the displacement plate 106. At the same time, the position of the second telescopic member 402 can be changed in conjunction with the displacement member 401 (ring guide rail), thereby realizing the change of the position of the displacement plate.

[0079] In some embodiments, see Figure 4 and Figure 8 A sealing cavity 1024 is provided on the inner wall of the slide groove 1022. A sealing ring 1061 is fixedly connected to the displacement plate 106. The sealing ring 1061 extends into the sealing cavity 1024. A sealing airbag is provided on the side of the sealing ring 1061 away from the displacement plate 106. A second pneumatic component is provided in the sealing ring 1061 and connected to the sealing airbag. The second pneumatic component is used to inflate the sealing airbag or evacuate the sealing airbag.

[0080] In the initial state or during non-detection periods, the sealing airbag is in a contracted state to reduce friction, allowing the positioner plate 106 to adjust the position of the guide column 104. Once the guide column 104 is adjusted, a second pneumatic component (such as an air pump controlled by a solenoid valve) is activated, and the second pneumatic component fills the sealing airbag. As gas is filled, the sealing airbag begins to expand, thereby blocking any possible leakage paths between the sealing ring 1061 and the sealing cavity 1024.

[0081] In some embodiments, see Figure 8 The sealing airbag includes two semi-circular airbags 1062, which are staggered. A pulley 1063 is provided between the two semi-circular airbags 1062, and the pulley 1063 is connected to the sealing ring 1061.

[0082] When a seal is required, the second pneumatic component simultaneously inflates the two staggered semi-circular airbags 1062. After the semi-circular airbags 1062 expand, they directly and rigidly contact the inner wall of the sealing cavity 1024, thereby blocking any possible leakage paths.

[0083] When the air guide column 104 needs to be adjusted, the semi-arc airbag 1062 is in a contracted state, leaving only the pulley 1063 in contact with the inner wall of the sealing cavity 1024. At this time, the displacement plate 106 minimizes friction with the inner wall of the sealing cavity 1024 when it moves.

[0084] In some embodiments, see Figure 8 and Figure 9 A sealing ring 1061 is rotatably connected to a turntable 1064 corresponding to each pulley 1063. The rotation axis of the turntable 1064 is perpendicular to the surface of the displacement disk 106. A wheel seat 1065 for mounting the pulley 1063 is slidably mounted on the turntable 1064. The wheel seat 1065 moves along the axial direction of the displacement disk 106. A fourth elastic member 1066 is fixedly connected between the wheel seat 1065 and the turntable 1064. The fourth elastic member 1066 has a pre-tightening force that causes the pulley 1063 to abut against the inner wall of the sealing cavity 1024. The outer wall of the pulley 1063 is provided with multiple suction ports 10631. A third pneumatic member is provided inside the pulley 1063 and communicates with the suction ports 10631. The third pneumatic member is used to evacuate air from the suction ports 10631.

[0085] Before the semi-circular airbag 1062 is inflated, the turntable 1064 can rotate freely to adapt to the position movement of the displacement plate 106. After the semi-circular airbag 1062 is inflated, the wheel seat 1065 moves outward in a direction perpendicular to the surface of the displacement plate 106 under the continuous thrust of the fourth elastic element 1066 (such as a spring) until the pulley 1063 presses against the inner wall of the sealing cavity 1024. This process ensures that each pulley 1063 can fit tightly and is not affected by the slight unevenness of the cavity wall.

[0086] Next, the crucial locking procedure is initiated: a third pneumatic component integrated inside the pulley 1063 (such as a miniature vacuum generator or a pipeline connected to the vacuum system) begins to operate, drawing air outwards through multiple suction ports 10631 distributed on the outer wall of the pulley 1063. A local vacuum is formed in the contact area between the pulley 1063 and the inner wall of the sealing cavity 1024, generating a suction force. This suction force, combined with the pre-tightening pressure provided by the fourth elastic component 1066, firmly "adheres" or "freezes" the pulley 1063, and consequently the entire sealing ring 1061 and the air guide column 104 assembly, into their current position.

[0087] In this state, even if the detection chamber is filled with high-pressure gas or the equipment experiences slight vibration, the displacement plate 106 and the air guide column 104 remain stable, and the sealing interface remains absolutely stable.

[0088] After the test is completed, the lock is released: the third pneumatic component first closes the vacuum and may introduce positive air pressure to break the vacuum adsorption. Then the semi-circular airbag 1062 exhausts and contracts, and the fourth elastic component 1066 is compressed. At this time, the pulley 1063 still presses against the inner wall of the sealed cavity 1024 to adapt to the position movement of the displacement plate 106.

[0089] In some embodiments, see Figure 2 and Figure 10 The transport unit 20 includes a transport machine 201, a reversing seat 202, a reversing structure, and a lifting structure. The transport machine 201 is arranged along a second direction and has multiple transport seats 2021. Each transport seat 2021 has a transport state connected to the transport machine 201 and a detection state separated from the transport machine 201. The reversing seat 202 is located inside the detection frame 101 and has a vertical rotation axis. The reversing structure is drivenly connected to the reversing seat 202 and is used to drive the reversing structure to rotate. The lifting structure is located on the reversing seat 202 and includes a lifting seat 203 and a lifting member fixed between the lifting seat 203 and the reversing seat 202. The lifting member extends and retracts in the vertical direction, and the lifting seat 203 is adsorbedly connected to the transport seat 2021.

[0090] The transport seat 2021 on the transport machine 201 carries the test piece and moves along the second direction. When the transport seat 2021 reaches the predetermined loading station in the testing frame 101, it stops. At this time, the lifting structure is activated, and the lifting component drives the lifting seat 203 to rise. The lifting seat 203 forms a firm adsorption connection with the bottom of the transport seat 2021 through a vacuum suction cup or electromagnet or other device on it.

[0091] After connection, the lifting seat 203 "picks up" the entire transport seat 2021 from the conveyor chain or guide rail of the transport machine 201, detaching it and putting it into "detection mode". Immediately afterwards, the reversing structure (such as a servo motor-driven rotary mechanism) begins to operate, driving the reversing seat 202, lifting component, lifting seat 203, and transport seat 2021—the entire assembly—to rotate 90 degrees. This rotation changes the orientation of the test piece, aligning its inflation port axis with the motion axis of the detection unit 10's docking plate 102.

[0092] Subsequently, the first telescopic component 103 of the detection unit 10 drives the docking plate 102 to a preset position, whereby it clamps and detects the workpiece. After detection, the docking plate 102 opens, the lifting component descends and places the transport seat 2021 back onto the conveyor track of the transport machine 201, the adsorption is released, the transport machine 201 starts and transports the tested workpiece away, and at the same time, the next workpiece to be tested enters, starting a new cycle.

[0093] In some embodiments, see Figure 10 The transport unit 20 also includes multiple positioning structures that are one-to-one located on the transport seat 2021.

[0094] The positioning structure includes a positioning base 204, two clamping assemblies, and multiple limiting pieces 207. The positioning base 204 is fixedly connected to the transport base 2021. The two clamping assemblies are disposed opposite to each other on both sides of the transport base 2021 along a first direction. Each clamping assembly includes two positioning pieces 205 disposed opposite to each other on both sides of the positioning base 204 along a second direction and multiple clamping wheels 206 disposed on the positioning pieces 205. The positioning pieces 205 are rotatably connected to the positioning base 204 and rotate about the first direction as the rotation axis. The multiple limiting pieces 207 correspond one-to-one with the positioning pieces 205. One end of the limiting piece 207 is fixedly connected to the positioning piece 205, and the other end of the limiting piece 207 is fixedly connected to the positioning base 204.

[0095] When the operator places the workpiece to be tested onto the positioning seat 204 of the transport seat 2021, the two sides of the workpiece will naturally contact the clamping wheels 206 on the clamping components on both sides. At this time, the workpiece is gently "embraced" in the center position. During the subsequent transport, lifting and 90-degree reversal process, the workpiece may have a slight displacement tendency due to inertia, but this tendency will be suppressed by the rolling friction of the clamping wheels 206, so that the workpiece always maintains the established posture and position throughout the entire process until it is smoothly sent into the testing station.

[0096] The opening of the clamping assembly can be adjusted by adjusting the limiting piece 207 and the positioning piece 205, thereby adapting to workpieces of different diameters.

[0097] Based on the same inventive concept, this application also provides an airtightness detection method, the steps of which are as follows:

[0098] S10. Set the corresponding test program on the airtightness testing equipment according to the standard test parameters, and set parameters such as inflation time, pressure holding time, test time, exhaust time, purging time, pressure threshold, and position of the tested part.

[0099] S20. After the item to be inspected is placed in the transport unit 20, a barcode scanning operation is performed. After the software system receives the information of the item to be inspected, the inspection unit 10 starts and enters the inspection program.

[0100] S30 and the detection unit 10 perform the detection procedure, which includes one vacuuming, vacuum pressure holding, air filling, air tightness test, exhaust, secondary vacuuming, air filling and purging.

[0101] S40. When the airtightness of the inspected part is determined to be unqualified, the system will issue an alarm and transmit the information to the next process.

[0102] The airtightness testing method provided in this embodiment, compared with the prior art, effectively eliminates residual air and impurities in the cavity and pipeline of the workpiece under test through the vacuum stage, significantly reducing measurement errors caused by impure gas or temperature changes, and improving the fundamental accuracy and repeatability of the test. The purging step after the gas filling test ensures that there is no residual test gas in the workpiece, meeting the requirements of downstream processes or safety specifications. At the same time, the vacuum degree of the workpiece under test can also be detected in the vacuum stage. If the vacuum degree is found to be insufficient in the vacuum stage, the workpiece under test is directly determined to be unqualified, and there is no need to perform gas filling test, thereby saving gas resources.

[0103] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An air tightness testing apparatus, characterized by, include: The detection unit includes a detection frame, a docking structure disposed within the detection frame, and an inflation structure. The docking structure includes two docking discs arranged opposite each other along a first direction, a first telescopic member fixed between the docking discs and the detection frame, and multiple air guiding components disposed on the docking discs. Each docking disc has an air guiding cavity. The inflation structure is used to inject gas into the air guiding cavity. Each docking disc also has multiple sliding grooves corresponding to the air guiding components. The first telescopic member extends and retracts along the first direction. Each air guiding component includes an air guiding column sliding in the sliding groove and a first elastic member fixed between the air guiding column and the docking disc. The air guiding column moves along the first direction and has an air guiding groove communicating with the air guiding cavity. The first elastic member has a pre-tightening force that causes the air guiding column to move outward from the docking disc. as well as A transport unit, connected to the testing frame, is used to transport the test piece between the two docking trays; The air guide column has multiple air expansion grooves on the periphery of the air guide groove, the air expansion grooves are connected to the air guide groove, the air expansion grooves are provided with air plugs, and the inner wall of the air expansion grooves is provided with a receiving groove for receiving the air plugs; the air guide column has an annular displacement cavity, the displacement cavity is connected to the multiple receiving grooves, and the displacement cavity is provided with a displacement unit. The shifting unit includes: A displacement component is fixedly connected to the inner wall of the displacement cavity, and the displacement component has a displacement seat that corresponds one-to-one with the air plug; Multiple displacement blocks are connected one-to-one with the displacement seat, and the air-blocking plug has a pressure-receiving surface for the displacement blocks to press against; and Multiple second elastic members are provided, each corresponding to one of the air-blocking plugs. The second elastic members are fixed between the air-blocking plugs and the air guide column. The second elastic members have a pre-tightening force that causes the air-blocking plugs to move into the air expansion groove.

2. The air tightness testing apparatus of claim 1, wherein The shifting unit also includes an adjustment structure that corresponds one-to-one with the shifting seat; The adjustment structure includes: A base is fixedly connected to the displacement seat, and the base has an adjustment groove for the displacement block to slide. The third elastic element is fixed between the base and the displacement block, and the third elastic element has a preload force that causes the displacement block to move toward the inside of the adjustment groove. An adjustable airbag is disposed within the adjustable groove; and A first pneumatic component is connected to the regulating airbag, and the first pneumatic component is used to inflate the regulating airbag or deflat the regulating airbag.

3. The air tightness testing apparatus of claim 1, wherein The inner wall of the chute is provided with an annular displacement cavity, and the air guiding assembly also includes a displacement disk disposed in the displacement cavity. The air guiding column is slidably connected to the displacement disk, and a displacement unit is also provided in the displacement cavity. The displacement unit includes: A displacement member, fixedly connected to the inner wall of the displacement cavity, the displacement member having at least two displacement seats; and At least two second telescopic members are provided one-to-one with the displacement seat. The second telescopic members extend and retract radially along the displacement plate. The telescopic members of the second telescopic members are connected to the displacement plate.

4. The air tightness testing apparatus of claim 3, wherein, The inner wall of the slide groove is provided with a sealing cavity, and the displacement plate is fixedly connected with a sealing ring. The sealing ring extends into the sealing cavity. A sealing airbag is provided on the side of the sealing ring away from the displacement plate. A second pneumatic component is provided inside the sealing ring and connected to the sealing airbag. The second pneumatic component is used to inflate the sealing airbag or evacuate the sealing airbag.

5. The air tightness testing apparatus of claim 4, wherein, The sealing airbag includes two semi-circular airbags, which are staggered and a pulley is provided between them, with the pulley connected to the sealing ring.

6. The air tightness testing apparatus of claim 5, wherein, The sealing ring is rotatably connected to a turntable corresponding to each pulley. The rotation axis of the turntable is perpendicular to the surface of the displacement plate. A wheel seat for mounting the pulley is slidably mounted on the turntable. The wheel seat moves along the axial direction of the displacement plate. A fourth elastic member is fixedly connected between the wheel seat and the turntable. The fourth elastic member has a pre-tightening force that causes the pulley to abut against the inner wall of the sealing cavity. The outer wall of the pulley has multiple suction ports. A third pneumatic member is provided inside the pulley and communicates with the suction ports. The third pneumatic member is used to evacuate air from the suction ports.

7. The air tightness testing apparatus of claim 1, wherein, The transport unit includes: A transport aircraft, arranged along a second direction, having multiple transport seats, each transport seat having a transport state connected to the transport aircraft and a detection state separated from the transport aircraft; A reversing seat is disposed inside the detection frame, and the reversing seat rotates about the vertical direction as its axis of rotation; A reversing structure, drively connected to the reversing seat, and used to drive the reversing structure to rotate; and A lifting structure is provided on the reversing seat. The lifting structure includes a lifting seat and a lifting member fixed between the lifting seat and the reversing seat. The lifting member extends and retracts in the vertical direction. The lifting seat is adsorbed and connected to the transport seat.

8. The air tightness testing apparatus of claim 7, wherein, The transport unit also includes multiple positioning structures that are one-to-one with the transport seat; The positioning structure includes: The positioning seat is fixedly connected to the transport seat; Two clamping assemblies are disposed opposite to each other on both sides of the transport seat along the first direction. Each clamping assembly includes two positioning plates disposed opposite to each other on both sides of the positioning seat along the second direction, and a plurality of clamping wheels disposed on the positioning plates. The positioning plates are rotatably connected to the positioning seat and rotate about the first direction as a rotation axis. Multiple limiting pieces are provided, each corresponding to a positioning piece. One end of each limiting piece is fixedly connected to the positioning piece, and the other end of each limiting piece is fixedly connected to the positioning seat.

9. A method for testing air tightness, comprising the air tightness testing equipment as described in any one of claims 1-8, characterized in that, The steps are as follows: S10. Set the corresponding test program on the airtightness testing equipment according to the standard test parameters, and set parameters such as inflation time, pressure holding time, test time, exhaust time, purging time, pressure threshold, and position of the tested part. S20. After the item to be inspected is placed in the transport unit, a barcode scanning operation is performed. After the software system receives the information of the item to be inspected, the inspection unit starts and enters the inspection program. S30, The detection unit performs the detection procedure, which includes one vacuuming, vacuum pressure holding, air filling, air tightness test, exhaust, secondary vacuuming, air filling, and purging. S40. When the airtightness of the inspected part is determined to be unqualified, the system will issue an alarm and transmit the information to the next process.

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