Device and process for detecting air tightness of air reservoir

Abstract

The invention relates to the technical field of air tightness detection, and particularly discloses air reservoir air tightness detection equipment and a detection process. The first sealing chamber and the second sealing chamber can be formed among the air tightness detection pipe, the sealing sleeve and the connector, the first sealing chamber and the second sealing chamber are pressurized, the pressure intensity in the two chambers is detected, and therefore the positions where air pressure leakage possibly occurs at all the connecting positions are detected, and the detection accuracy is improved. Pre-detection before air tightness detection is achieved, air tightness of the joint connecting position is detected in advance, and misjudgment of the air tightness detection result caused by leakage of the joint connecting position is avoided.

Description

Technical Field

[0001] This application relates to the field of airtightness testing technology, and in particular to an airtightness testing device and testing process for an air storage cylinder. Background Technology

[0002] The air reservoir is a core energy storage component of a vehicle's braking and air suspension systems. The high-pressure air stored inside drives the brake calipers and adjusts the suspension height. The reliability of its sealing directly affects the vehicle's driving safety and operational stability. If the air reservoir leaks, it can lead to insufficient system pressure, decreased performance, and frequent compressor starts, increasing energy consumption. In severe cases, insufficient pressure during emergency braking can cause brake failure, resulting in serious traffic accidents. Therefore, rigorous airtightness testing of the air reservoir before it leaves the factory is an indispensable and crucial process for ensuring product quality and driving safety.

[0003] Currently, automated testing equipment is typically used to test the air tightness of automotive air tanks. This equipment mainly consists of a telescopic drive element, an air tightness testing connector, a pressure sensor, an air circuit control system, and an industrial computer. The specific testing process is as follows: First, the airtightness testing connector is moved forward by the telescopic drive element, mechanically docking with the interface of the air storage cylinder, and an initial seal is formed by the sealing ring at the end of the connector. Then, the testing equipment fills the air storage cylinder with compressed air or nitrogen at a predetermined pressure through the channel inside the connector. After filling is completed, the pressure holding stage begins, and a high-precision pressure sensor monitors the pressure changes in the closed cavity in real time. Finally, the system determines whether the air storage cylinder is airtight based on whether the pressure drop exceeds the allowable threshold within a set time.

[0004] However, the aforementioned testing system actually comprises two parts: the testing equipment itself and the tested gas cylinder. The pressure sensor monitors the overall sealing performance of this series system. When the test result is unsatisfactory, the system cannot distinguish whether the leak originates from the gas cylinder itself or from the connection interface between the testing connector and the gas cylinder connector. In actual production, leaks at the connection points often occur due to factors such as worn connector seals, foreign objects at the interface, misalignment, or the check valve not opening properly. This can cause qualified gas cylinders to be mistakenly judged as unqualified, resulting in unnecessary product scrapping or rework, increasing production costs. More seriously, it requires frequent interruptions to the automated production line for troubleshooting, significantly impacting production efficiency and equipment utilization.

[0005] Therefore, there is an urgent need for a detection technology and process that can effectively identify and avoid interference from leakage at the connection point. Summary of the Invention

[0006] In order to accurately distinguish and resolve the problem of misjudgment caused by leakage at the connection between the test connector and the gas storage cylinder connector, this application provides a gas storage cylinder airtightness testing device and testing process.

[0007] This application provides a gas storage cylinder airtightness testing device, which adopts the following technical solution: An airtightness testing device for a gas storage cylinder includes a conveyor belt on which multiple mounting plates are conveyed at intervals. Each mounting plate is equipped with a gas storage cylinder body and a fixing mechanism for fixing the gas storage cylinder body. On both sides of the conveyor belt, corresponding to two joints of the gas storage cylinder body, an airtightness testing mechanism, a docking mechanism for connecting the airtightness testing mechanism to the corresponding joint, and a stabilization mechanism for ensuring a stable connection between the docking mechanism and the joint are provided.

[0008] Optionally, the docking mechanism includes a first telescopic member, a connecting plate, an airtightness detection tube, and a sealing sleeve. The first telescopic member is installed on the fixed part of the conveyor belt, and its telescopic end is fixedly connected to the connecting plate. The end of the connecting plate away from the first telescopic member is fixedly connected to the airtightness detection tube, and the sealing sleeve is slidably and sealingly fitted outside the airtightness detection tube. The diameter of the end of the airtightness detection tube away from the connecting plate is smaller than the diameter of the end near the connecting plate. A sealing plug is fixedly provided at the front end of the airtightness detection tube and slides to seal the inner cavity of the sealing sleeve. A flow hole communicating with the inner cavity of the airtightness detection tube is provided on the sealing plug. The airtightness detection mechanism is communicating with the inner cavity of the rear end of the airtightness detection tube. The rear end of the airtightness detection tube slides to seal with the inner wall of the sealing sleeve. A first sealing chamber is formed between the front end of the airtightness detection tube and the sealing sleeve. The front end of the sealing sleeve is provided with an annular groove for engaging with the connector. The annular groove divides the front end of the sealing sleeve into an inner insertion part and an outer engagement part. The insertion part is used to slide and seal into the connector, and the end and side wall form a second sealing chamber with the inner wall of the connector. The engagement part is used to slide and engage with the outer wall of the connector.

[0009] Optionally, the stabilization mechanism includes a locking assembly for driving the locking portion to abut against and fix the outer wall of the connector when the air tightness detection tube is inserted into the connector, and a pressurizing assembly for pressurizing the first sealing chamber and the second sealing chamber and reducing the pressure difference with the inner cavity of the gas storage cylinder body during detection.

[0010] Optionally, the locking assembly includes an abutting lock head, a connecting rod slidably installed inside the sealing sleeve and whose end is fixedly connected to the abutting lock head, a push rod slidably installed inside the sealing sleeve, and a gear rotatably installed inside the sealing sleeve; The connecting rod and the push rod slide in the same direction, and a rack that meshes with the gear is provided on the side that is close to each other. One end of the push rod extends into the first sealing chamber and the end is provided with a wedge-shaped surface. The other end of the push rod is provided with a pressing spring for pushing the end of the push rod into the first sealing chamber. The front end and the rear end of the airtightness detection tube are adapted to the wedge-shaped surface of the end of the push rod.

[0011] Optionally, the pressurization assembly includes a pressurization detection element and a pressurization tube. The pressurization detection element is connected to the pressurization tube, and the pressurization tube is disposed inside the airtightness detection tube and is connected to the first sealing chamber.

[0012] Optionally, the stabilization mechanism further includes a fixed platform fixed to the mounting plate, a second telescopic member disposed on the connecting plate, and a locking post fixed to the telescopic end of the second telescopic member. The fixed platform is provided with a locking hole adapted to the locking post. The locking post is inserted into the locking hole after the airtightness detection tube and the sealing sleeve are stably connected to the connector.

[0013] Optionally, a fixing ring is fitted onto the airtightness testing tube, and multiple insertion grooves are provided at the end of the sealing sleeve corresponding to the fixing ring. Multiple insertion rods are provided on the fixing ring that are adapted to be inserted into each of the insertion grooves. Each insertion rod is fitted with a push spring. One end of the push spring is fixed to the end face of the fixing ring, and the other end is fixedly connected to the end of the sealing sleeve. When the push spring is not subjected to external force, there is a gap between the end of the insertion rod and the bottom wall of the insertion groove.

[0014] Optionally, the airtightness testing mechanism includes an airtightness testing element and an airtightness tube. The airtightness testing element is connected to the airtightness tube, and the airtightness tube is disposed inside the airtightness testing tube and is connected to the flow hole.

[0015] Optionally, the fixing mechanism includes a fixing frame for fixing the peripheral wall of the gas storage cylinder body, a supporting and limiting seat for supporting and limiting the joint of the gas storage cylinder body, and an adjustable positioning clamp for stabilizing the supporting and limiting seat.

[0016] This application also provides a process for testing the air tightness of a gas storage cylinder, which involves using one of the aforementioned gas storage cylinder air tightness testing devices and the following steps: S1: Place the gas cylinder body upside down on the mounting plate, so that the joint of the gas cylinder body is engaged in the support limit seat. Fix the periphery of the gas cylinder body to the fixing frame with bolts. Then adjust the position of the adjustable positioning clamp until the support limit seat is clamped and fixed. S2: Place the mounting plate and the air storage cylinder body fixedly mounted on the mounting plate on the conveyor belt. The conveyor belt transports the mounting plate and the air storage cylinder body. When they reach the air tightness test station, the conveyor belt stops transporting. S3: The first telescopic component extends, causing the airtightness detection tube to insert the sealing sleeve into the connector of the gas storage cylinder body, so that the locking part of the sealing sleeve slides and locks against the outer wall of the gas storage cylinder body, keeping the first sealing chamber and the second sealing chamber sealed. Continue to control the extension of the first telescopic component until the end of the insertion rod abuts against the bottom wall of the insertion groove. At this time, the locking head abuts tightly against the outer wall of the connector and forms a sliding seal with the locking part. At this time, the first telescopic component stops extending. S4: Control the extension of the second telescopic component, which drives the locking pin to insert into the locking hole, thereby fixing the airtightness detection tube and the sealing sleeve; S5: Apply air pressure to the pressure testing component. The air pressure inside the pressure testing component is transmitted to the pressure tube, causing the air pressure in the first and second sealing chambers to rise to a predetermined value. Maintain the air pressure for a fixed time and use the barometer built into the pressure testing component to detect the air pressure in the first and second sealing chambers. If the air pressure remains stable after a fixed time, keep the air pressure in the first and second sealing chambers unchanged and continue to the next step. Otherwise, disconnect all previous connections and check whether the airtightness test tube, sealing sleeve and joint are properly sealed. S6: Apply pressure to the airtightness testing component. The air pressure inside the airtightness testing component is transmitted to the airtight tube and then enters the air storage cylinder body, causing the air pressure inside the air storage cylinder body to rise to another predetermined value. Maintain the air pressure for a fixed time and use the air pressure gauge built into the airtightness testing component to detect the airtightness of the air storage cylinder body. If the air pressure remains stable after the fixed time, it proves that the airtightness of the air storage cylinder body is good. If the air pressure changes, it proves that the airtightness of the air storage cylinder body is poor.

[0017] In summary, this application includes at least one of the following beneficial technical effects: 1. This application can generate a first sealing chamber and a second sealing chamber between the airtightness testing tube, the sealing sleeve and the joint. By pressurizing the first sealing chamber and the second sealing chamber, the pressure in the two chambers is detected, thereby detecting places where air pressure leakage may occur at each connection, realizing pre-testing before airtightness testing, realizing pre-testing of the airtightness of the joint connection, and eliminating the possibility of misjudgment of airtightness test results due to leakage at the joint connection; 2. The first and second sealing chambers can not only serve as a basis for determining whether there is a leak at the connection, but also reduce the pressure difference on both sides of the joint by pressurizing the two chambers. In other words, it can minimize the pressure difference between the inside of the gas storage tank and the outside of the connection during the test, ensuring that the connection does not leak while maximizing the connection stability at the joint. 3. During the connection process, the airtightness detection tube can achieve stability of the connection between the sealing sleeve and the joint through the locking component, and achieve more accurate and stable detection and connection effect by combining the reduced pressure difference between the first sealing chamber and the second sealing chamber; 4. The fixing mechanism on the mounting plate and the locking pins and locking holes on the fixing platform can achieve a more constant connection between the airtightness testing tube, the sealing sleeve and the joint, further strengthening the stability of the connection, further reducing the possibility of leakage at the connection, improving the sealing performance of the connection, and providing a good testing environment for airtightness testing. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the gas storage tank airtightness testing equipment when testing the gas storage tank body; Figure 2 yes Figure 1 A schematic diagram of the structure of the gas storage tank body mounted on the mounting plate; Figure 3 yes Figure 2 Schematic diagram of the mounting plate in the middle; Figure 4 yes Figure 2 A schematic diagram of the docking mechanism and the airtightness testing mechanism; Figure 5 yes Figure 4 A schematic diagram of the internal structure of the docking mechanism; Figure 6 yes Figure 5 A schematic diagram of the internal structure of the airtightness testing tube and the sealing sleeve.

[0020] Reference numerals: 1. Conveyor belt; 11. Mounting plate; 111. Fixing platform; 112. Locking hole; 12. Roller; 2. Fixing mechanism; 21. Fixing frame; 22. Supporting and limiting seat; 23. Adjustable positioning clamp; 3. Gas storage cylinder body; 4. Air tightness testing mechanism; 41. Air tightness testing components; 411. Barometer; 412. Inlet pipe; 413. Outlet pipe; 414. Switching valve; 42. Air tightness tube; 5. Docking mechanism; 51. First telescopic component; 52. Connecting plate; 521. Second telescopic component; 522. Locking post; 53. Air tightness test tube; 531. Sealing plug; 532. First sealing chamber; 533. Fixing ring; 534. Insert rod; 535. Push spring; 54. Sealing sleeve; 541. Insertion part; 542. Snap-fit ​​part; 543. Second sealing chamber; 544. Annular sealing ring; 6. Stabilizing mechanism; 61. Abutment lock head; 62. Connecting rod; 63. Push rod; 64. Gear; 65. Rack; 66. Pressing spring; 67. Pressure detection component; 68. Pressure tube. Detailed Implementation

[0021] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail below.

[0022] This application discloses an airtightness testing device for a gas storage cylinder.

[0023] Reference Figure 1 and Figure 2 An airtightness testing device for a gas storage cylinder includes a conveyor belt 1, on which multiple mounting plates 11 are conveyed at intervals. Each mounting plate 11 is equipped with a gas storage cylinder body 3 and a fixing mechanism 2 for fixing the gas storage cylinder body 3. On both sides of the conveyor belt 1, at two joints corresponding to the gas storage cylinder body 3, an airtightness testing mechanism 4, a docking mechanism 5 for connecting the airtightness testing mechanism 4 to the corresponding joint, and a stabilization mechanism 6 for ensuring a stable connection between the docking mechanism 5 and the joint.

[0024] In this embodiment, a position sensor for detecting the position of each mounting plate 11 and a control system for controlling the operation of all electrical components are installed on the conveyor belt 1. The control system is a well-known technology in the art, so it will not be described in detail here.

[0025] Reference Figure 2 and Figure 3 The fixing mechanism 2 includes a fixing frame 21 for fixing the periphery of the gas storage cylinder body 3, a supporting and limiting seat 22 for supporting and limiting the joint of the gas storage cylinder body 3, and an adjustable positioning clamp 23 for stabilizing the supporting and limiting seat 22.

[0026] Place the gas cylinder body 3 upside down on the mounting plate 11, so that the joint of the gas cylinder body 3 is engaged in the support and limiting seat 22. Fix the peripheral wall of the gas cylinder body 3 to the fixing frame 21 with bolts. Then adjust the position of the adjustable positioning clamp 23 until the support and limiting seat 22 is clamped and fixed.

[0027] Reference Figure 2 and Figure 3 The mounting plate 11 is provided with multiple rollers 12 on its side. The mounting plate 11 and the air storage cylinder body 3 fixedly mounted on the mounting plate 11 are placed on the conveyor belt 1. The rollers 12 can roll and connect with the side wall of the conveyor belt 1, so that the mounting plate 11 can be limited. While limiting the position, the transmission can be smooth and easy. When the air tightness test station is reached, the conveyor belt 1 stops conveying. At this time, the air tightness test of the air storage cylinder body 3 is performed.

[0028] Specifically, refer to Figure 4 and Figure 5 The docking mechanism 5 includes a first telescopic member 51, a connecting plate 52, an airtightness detection tube 53, and a sealing sleeve 54. The first telescopic member 51 is installed on the fixed part of the conveyor belt 1, and the telescopic end is fixedly connected to the connecting plate 52. The end of the connecting plate 52 away from the first telescopic member 51 is fixedly connected to the airtightness detection tube 53. The sealing sleeve 54 is slidably and sealingly fitted outside the airtightness detection tube 53.

[0029] The diameter of the end of the airtightness testing tube 53 furthest from the connecting plate 52 is smaller than the diameter of the end closest to the connecting plate 52. A sealing plug 531 is fixedly provided at the front end of the airtightness testing tube 53, which slides and seals with the inner cavity of the sealing sleeve 54. A flow hole communicating with the inner cavity of the airtightness testing tube 53 is provided on the sealing plug 531. The airtightness testing mechanism 4 is connected to the inner cavity of the rear end of the airtightness testing tube 53. The rear end of the airtightness testing tube 53 slides and seals with the inner wall of the sealing sleeve 54. A first sealing chamber 532 is formed between the front end of the airtightness testing tube 53 and the sealing sleeve 54.

[0030] Reference Figure 4 and Figure 5 The front end of the sealing sleeve 54 is provided with an annular groove for engaging with the connector. The annular groove divides the front end of the sealing sleeve 54 into an inner insertion part 541 and an outer engagement part 542. The insertion part 541 is used to slide and seal into the connector, and the end and side wall form a second sealing chamber 543 between the connector and the inner wall of the connector. The front end of the insertion part 541 is provided with an annular sealing ring 544 for sealing. The engagement part 542 is used to slide and engage with the outer wall of the connector.

[0031] Reference Figure 4 and Figure 5A fixing ring 533 is fitted onto the airtightness testing tube 53. The end of the sealing sleeve 54 is provided with multiple insertion grooves corresponding to the fixing ring 533. The fixing ring 533 is provided with multiple insertion rods 534 that are adapted to be inserted into each insertion groove. Each insertion rod 534 is fitted with a push spring 535. One end of the push spring 535 is fixed to the end face of the fixing ring 533, and the other end is fixedly connected to the end of the sealing sleeve 54. When the push spring 535 is not subjected to external force, there is a gap between the end of the insertion rod 534 and the bottom wall of the insertion groove.

[0032] When testing is required, the first telescopic component 51 activates and extends, pushing the connecting plate 52, the airtightness testing tube 53, and the sealing sleeve 54 (covered by the tube) together towards the gas storage cylinder connector. The insertion part 541 at the front end of the sealing sleeve 54 first inserts into the inner hole of the connector, while the snap-fit ​​part 542 fits onto the outer wall of the connector, allowing the sealing sleeve 54 to abut against the connector, completing the initial alignment and coverage.

[0033] Immediately afterwards, the first telescopic component 51 continues to advance. At this time, the airtightness detection tube 53 will move relative to the sealing sleeve. The airtightness detection tube 53 will continue to slide forward inside the sealing sleeve 54, and the stabilizing mechanism 6 will further fix the connection of the sealing sleeve 54.

[0034] Specifically, refer to Figure 5 and Figure 6 The stabilization mechanism 6 includes a locking assembly for driving the snap-fit ​​portion 542 to abut against and fix the connector when the airtightness detection tube 53 is inserted into the connector, and a pressurizing assembly for pressurizing the first sealing chamber 532 and the second sealing chamber 543 and reducing the pressure difference with the inner cavity of the gas storage cylinder body 3 during detection.

[0035] Reference Figure 5 and Figure 6 The locking assembly includes an abutting lock head 61, a connecting rod 62 that is slidably installed in the sealing sleeve 54 and whose end is fixedly connected to the abutting lock head 61, a push rod 63 that is slidably installed in the sealing sleeve 54, and a gear 64 that is rotatably installed in the sealing sleeve 54.

[0036] The connecting rod 62 and the push rod 63 slide in the same direction, and both sides are provided with racks 65 that mesh with gears 64. One end of the push rod 63 extends into the first sealing chamber 532 and the end is provided with a wedge-shaped surface. The other end of the push rod 63 is provided with a pressing spring 66 for pushing the end of the push rod 63 into the first sealing chamber 532. The front and rear ends of the airtightness detection tube 53 are adapted to the wedge-shaped surfaces of the push rod 63 ends.

[0037] When the airtightness testing tube 53 advances to a specific position, its body contacts the wedge-shaped surface at the end of the push rod 63 and begins to compress it. This compressing action forces the push rod 63 to slide backward, compressing the pressing spring 66 behind it. The linear motion of the push rod 63 is transmitted to the gear 64 meshing with it through the rack 65 on its side. The rotation of the gear 64 then drives the rack 65 on the connecting rod 62 on the other side, causing the connecting rod 62 to extend outward. Finally, the abutment locking head 61 fixed to the end of the connecting rod 62 is pressed tightly against the outer wall of the connector covered by the locking part 542, completing the mechanical locking.

[0038] It is worth noting that the locking head 61 is made of a flexible material, such as rubber. In this embodiment, the locking head 61 is made of fluororubber. In other feasible embodiments, silicone rubber, nitrile rubber, ethylene propylene rubber or natural rubber may also be used.

[0039] The flexible locking head 61 can achieve a seal at the connection point after the abutment is completed, so that the first sealing chamber 532 remains sealed. Sealing rubber can also be provided on the outer wall of the corresponding insertion part 541 of the second sealing chamber 543, so that the inner wall of the end of the connector can form a seal with the outer wall of the insertion part 541, thereby keeping the second sealing chamber 543 sealed.

[0040] Continue to control the extension of the first telescopic member 51 until the end of the plug rod 534 abuts against the bottom wall of the plug groove, so that a rigid abutment is formed between the airtightness detection tube 53 and the sealing sleeve 54. During this process, the abutment lock head 61 continues to abut and continues to deform, thereby making the abutment of the joint more stable, so that the abutment lock head 61 achieves a tighter seal on the cavity where the abutment lock head 61 slides, and strictly ensures the airtightness of the first sealing chamber 532.

[0041] Furthermore, refer to Figure 2 and Figure 3 The stabilization mechanism 6 also includes a fixed platform 111 fixed on the mounting plate 11, a second telescopic member 521 set on the connecting plate 52, and a locking post 522 fixed on the telescopic end of the second telescopic member 521. The fixed platform 111 is provided with a locking hole 112 that is compatible with the locking post 522. After the air tightness detection tube 53 and the sealing sleeve 54 are stably connected with the connector, the locking post 522 is inserted into the locking hole 112.

[0042] Once the connection between the airtightness testing tube 53, the sealing sleeve 54, and the connector is stable, the second telescopic member 521 extends, allowing the locking pin 522 to be inserted into the corresponding locking hole 112, thus achieving further locking.

[0043] Reference Figure 5 and Figure 6The pressurization assembly includes a pressurization detection element 67 and a pressurization tube 68. The pressurization detection element 67 is connected to the pressurization tube 68. The pressurization tube 68 is disposed inside the airtightness detection tube 53. The pressurization tube 68 passes through the airtightness detection tube 53 and is connected to the first sealing chamber 532. The insertion part 541 of the sealing sleeve 54 is provided with a connecting hole that connects the first sealing chamber 532 and the second sealing chamber 543.

[0044] Reference Figure 4 and Figure 5 The air tightness testing mechanism 4 includes an air tightness testing element 41 and an air tightness tube 42. The air tightness testing element 41 is connected to the air tightness tube 42. The air tightness tube 42 is located inside the air tightness testing tube 53 and is connected to the flow hole.

[0045] The pressure testing component 67 and the airtightness testing component 41 have similar structures, both including a barometer 411, an inlet pipe 412, an outlet pipe 413, and a switching valve 414. The inlet pipe 412 is connected to the corresponding pressure pipe 68 or airtight pipe 42. The switching valve 414 is installed on the inlet pipe 412, and the outlet pipe 413 is installed on the switching valve 414. The barometer 411 is connected to the inlet pipe 412. When the switching valve 414 is switched, the inlet pipe 412 or the outlet pipe 413 can be connected to the corresponding pressure pipe 68 or airtight pipe 42 respectively, realizing the switching of the channel.

[0046] This application also discloses a process for testing the air tightness of a gas storage cylinder, which uses the aforementioned gas storage cylinder air tightness testing equipment and includes the following steps: S1: Place the gas cylinder body 3 upside down on the mounting plate 11, so that the joint of the gas cylinder body 3 is engaged in the support and limiting seat 22. Fix the peripheral wall of the gas cylinder body 3 to the fixing frame 21 with bolts. Then adjust the position of the adjustable positioning clamp 23 until the support and limiting seat 22 is clamped and fixed. S2: Place the mounting plate 11 and the air storage cylinder body 3 fixedly mounted on the mounting plate 11 on the conveyor belt 1. The conveyor belt 1 transports the mounting plate 11 and the air storage cylinder body 3. When they reach the air tightness test station, the conveyor belt 1 stops transporting. S3: The first telescopic member 51 extends, causing the air tightness detection tube 53 to drive the insertion part 541 of the sealing sleeve 54 into the joint of the gas storage cylinder body 3, so that the locking part 542 of the sealing sleeve 54 slides and locks against the outer wall of the gas storage cylinder body 3, so that the first sealing chamber 532 and the second sealing chamber 543 remain sealed. Continue to control the extension of the first telescopic member 51 until the end of the insertion rod 534 abuts against the bottom wall of the insertion groove. At this time, the locking head 61 abuts tightly against the outer wall of the joint and forms a sliding seal with the locking part 542. At this time, the first telescopic member 51 stops extending. S4: Control the extension of the second telescopic component 521. The second telescopic component 521 drives the locking pin 522 to be inserted into the locking hole 112, thereby fixing the airtightness detection tube 53 and the sealing sleeve 54. S5: Apply air pressure to the pressure testing element 67. The air pressure in the pressure testing element 67 is transmitted to the pressure tube 68, causing the air pressure in the first sealing chamber 532 and the second sealing chamber 543 to rise to a predetermined certain value. Maintain the air pressure for a fixed time and use the barometer 411 built into the pressure testing element 67 to detect the air pressure in the first sealing chamber 532 and the second sealing chamber 543. If the air pressure is stable and does not change after a fixed time, keep the air pressure in the first sealing chamber 532 and the second sealing chamber 543 unchanged and continue to the next step. Otherwise, disconnect all previous connections and check whether the airtightness test tube 53, the sealing sleeve 54 and the connection at the joint are well sealed. S6: Apply pressure to the airtightness testing element 41. The air pressure inside the airtightness testing element 41 is transmitted to the airtight tube 42 and then enters the air storage cylinder body 3, causing the air pressure inside the air storage cylinder body 3 to rise to another predetermined value. Maintain the air pressure for a fixed time and use the barometer 411 built into the airtightness testing element 41 to detect the airtightness of the air storage cylinder body 3. If the air pressure remains stable after a fixed time, it proves that the airtightness of the air storage cylinder body 3 is good. If the air pressure changes, it proves that the airtightness of the air storage cylinder body 3 is poor.

[0047] The above are all optional embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A gas storage cylinder airtightness testing device, used to test the gas storage cylinder body (3), characterized in that: The system includes a conveyor belt (1) on which multiple mounting plates (11) are transported at intervals. Each mounting plate (11) is equipped with a gas storage cylinder body (3) and a fixing mechanism (2) for fixing the gas storage cylinder body (3). On both sides of the conveyor belt (1), corresponding to the two joints of the gas storage cylinder body (3), an air tightness detection mechanism (4), a docking mechanism (5) for connecting the air tightness detection mechanism (4) to the corresponding joint, and a stabilization mechanism (6) for stably connecting the docking mechanism (5) to the joint are provided.

2. The airtightness testing device for a gas storage cylinder according to claim 1, characterized in that: The docking mechanism (5) includes a first telescopic member (51), a connecting plate (52), an airtightness detection tube (53), and a sealing sleeve (54). The first telescopic member (51) is installed on the fixed part of the conveyor belt (1), and the telescopic end is fixedly connected to the connecting plate (52). The end of the connecting plate (52) away from the first telescopic member (51) is fixedly connected to the airtightness detection tube (53). The sealing sleeve (54) is slidably and sealingly fitted outside the airtightness detection tube (53). The diameter of the end of the airtightness detection tube (53) away from the connecting plate (52) is smaller than the diameter of the end near the connecting plate (52). A sealing plug (531) is fixedly provided at the front end of the airtightness detection tube (53) and slides to seal the inner cavity of the sealing sleeve (54). A flow hole communicating with the inner cavity of the airtightness detection tube (53) is provided on the sealing plug (531). The airtightness detection mechanism (4) communicates with the inner cavity of the rear end of the airtightness detection tube (53). The rear end of the airtightness detection tube (53) slides to seal the inner wall of the sealing sleeve (54). A first sealing chamber (532) is formed between the front end of the airtightness detection tube (53) and the sealing sleeve (54). The sealing sleeve (54) has an annular groove at its front end that engages with the connector. The annular groove divides the front end of the sealing sleeve (54) into an inner insertion part (541) and an outer snap-fit ​​part (542). The insertion part (541) is used to slide and seal into the connector, and its end and side wall form a second sealing chamber (543) with the inner wall of the connector. The snap-fit ​​part (542) is used to slide and snap onto the outer wall of the connector.

3. The airtightness testing device for a gas storage cylinder according to claim 2, characterized in that: The stabilization mechanism (6) includes a locking component for driving the snap-fit ​​part (542) to abut against and fix the outer wall of the connector when the air tightness detection tube (53) is inserted into the connector, and a pressurizing component for pressurizing the first sealing chamber (532) and the second sealing chamber (543) and reducing the pressure difference with the inner cavity of the gas storage cylinder body (3) during detection.

4. The airtightness testing device for a gas storage cylinder according to claim 3, characterized in that: The locking assembly includes an abutting lock head (61), a connecting rod (62) slidably installed in the sealing sleeve (54) and whose end is fixedly connected to the abutting lock head (61), a push rod (63) slidably installed in the sealing sleeve (54), and a gear (64) rotatably installed in the sealing sleeve (54). The connecting rod (62) and the push rod (63) slide in the same direction, and a rack (65) that meshes with the gear (64) is provided on the side that is close to each other. One end of the push rod (63) extends into the first sealing chamber (532) and the end is provided with a wedge-shaped surface. The other end of the push rod (63) is provided with a pressing spring (66) for pushing the end of the push rod (63) into the first sealing chamber (532). The front end and the rear end of the airtightness detection tube (53) are adapted to the wedge-shaped surface of the end of the push rod (63).

5. The airtightness testing device for a gas storage cylinder according to claim 3, characterized in that: The pressurization assembly includes a pressurization detection element (67) and a pressurization tube (68). The pressurization detection element (67) is connected to the pressurization tube (68). The pressurization tube (68) is disposed inside the airtightness detection tube (53) and is connected to the first sealing chamber (532).

6. The airtightness testing device for a gas storage cylinder according to claim 2, characterized in that: The stabilization mechanism (6) further includes a fixed platform (111) fixed on the mounting plate (11), a second telescopic member (521) set on the connecting plate (52), and a locking post (522) fixed on the telescopic end of the second telescopic member (521). The fixed platform (111) is provided with a locking hole (112) adapted to the locking post (522). The locking post (522) is inserted into the locking hole (112) after the air tightness detection tube (53) and the sealing sleeve (54) are stably connected to the connector.

7. The airtightness testing device for a gas storage cylinder according to claim 2, characterized in that: A fixing ring (533) is fitted and fixed on the airtightness testing tube (53). The end of the sealing sleeve (54) is provided with multiple insertion grooves corresponding to the fixing ring (533). The fixing ring (533) is provided with multiple insertion rods (534) that are adapted to be inserted into each insertion groove. Each insertion rod (534) is fitted with a push spring (535). One end of the push spring (535) is fixed to the end face of the fixing ring (533), and the other end is fixedly connected to the end of the sealing sleeve (54). When the push spring (535) is not subjected to external force, there is a gap between the end of the insertion rod (534) and the bottom wall of the insertion groove.

8. The airtightness testing device for a gas storage cylinder according to claim 2, characterized in that: The airtightness testing mechanism (4) includes an airtightness testing component (41) and an airtightness tube (42). The airtightness testing component (41) is connected to the airtightness tube (42). The airtightness tube (42) is disposed inside the airtightness testing tube (53) and is connected to the flow hole.

9. The airtightness testing device for a gas storage cylinder according to claim 1, characterized in that: The fixing mechanism (2) includes a fixing frame (21) for fixing the periphery of the gas cylinder body (3), a supporting and limiting seat (22) for supporting and limiting the joint of the gas cylinder body (3), and an adjustable positioning clamp (23) for stabilizing the supporting and limiting seat (22).

10. A process for testing the air tightness of a gas storage cylinder, comprising testing with the air tightness testing equipment for a gas storage cylinder as described in any one of claims 1-9, characterized in that: The following steps are adopted: S1: Place the gas cylinder body (3) upside down on the mounting plate (11) so that the joint of the gas cylinder body (3) is snapped into the support limit seat (22). Fix the periphery of the gas cylinder body (3) to the fixing frame (21) with bolts. Then adjust the position of the adjustable positioning clamp (23) until the support limit seat (22) is clamped and fixed. S2: Place the mounting plate (11) and the air storage cylinder body (3) fixedly mounted on the mounting plate (11) on the conveyor belt (1). The conveyor belt (1) transports the mounting plate (11) and the air storage cylinder body (3). When it reaches the air tightness test station, the conveyor belt (1) stops transporting. S3: The first telescopic component (51) extends, causing the airtightness detection tube (53) to drive the insertion part (541) of the sealing sleeve (54) to be inserted into the joint of the gas storage cylinder body (3), so that the snap-fit ​​part (542) of the sealing sleeve (54) slides and snaps against the outer wall of the gas storage cylinder body (3), so that the first sealing chamber (532) and the second sealing chamber (543) remain sealed. Continue to control the extension of the first telescopic component (51) until the end of the insertion rod (534) abuts against the bottom wall of the insertion groove. At this time, the abutment lock head (61) abuts tightly against the outer wall of the joint and forms a sliding seal with the snap-fit ​​part (542). At this time, the first telescopic component (51) stops extending. S4: Control the extension of the second telescopic component (521), and the second telescopic component (521) drives the locking pin (522) to be inserted into the locking hole (112) to fix the airtightness detection tube (53) and the sealing sleeve (54); S5: Apply air pressure to the pressure testing component (67). The air pressure in the pressure testing component (67) is transmitted to the pressure tube (68), causing the air pressure in the first sealed chamber (532) and the second sealed chamber (543) to rise to a predetermined certain value. Maintain the air pressure for a fixed time and use the barometer (411) built into the pressure testing component (67) to detect the air pressure in the first sealed chamber (532) and the second sealed chamber (543). If the air pressure is stable and does not change after a fixed time, keep the air pressure in the first sealed chamber (532) and the second sealed chamber (543) unchanged and continue to the next step. Otherwise, disconnect all the previous connections and check whether the airtightness test tube (53), the sealing sleeve (54) and the connection at the joint are well sealed. S6: Apply pressure to the airtightness testing component (41), and the air pressure in the airtightness testing component (41) is transmitted to the airtight tube (42) and then enters the air storage cylinder body (3), so that the air pressure in the air storage cylinder body (3) is raised to another predetermined value. The air pressure is maintained for a fixed time and the airtightness of the air storage cylinder body (3) is tested using the air pressure gauge (411) on the airtightness testing component (41). If the air pressure is stable and does not change after a fixed time, it proves that the airtightness of the air storage cylinder body (3) is good. If the air pressure changes, it proves that the airtightness of the air storage cylinder body (3) is poor.

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