Composite bag sealing performance detection device

Abstract

The invention relates to the technical field of composite bag detection, in particular to a composite bag airtightness detection device which comprises an equipment base, a multi-station workbench and an airtightness detection mechanism, and the equipment base is composed of a base, a mounting groove formed in the upper surface of the base and a supporting column fixedly mounted on the inner bottom wall of the mounting groove. The multi-station workbench comprises a supporting ring rotationally mounted on the inner wall of the mounting groove through a bearing, a supporting cylinder fixedly mounted at the upper end of the supporting ring and a top ring fixedly mounted at the upper end of the supporting cylinder, and a driving mechanism capable of driving the multi-station workbench to move is arranged in the mounting groove. According to the compound bag sealing performance detection device, through the meshing transmission design of the driving mechanism and the inner gear ring, precise rotation of the multi-station workbench is achieved, when one station is used for feeding, the other three stations can conduct detection work, the detection efficiency is greatly improved, and the compound bag sealing performance detection device is suitable for rapid quality screening of large-batch compound bags.

Description

Technical Field

[0001] This application relates to the field of composite bag testing technology, and in particular to a composite bag sealing performance testing device. Background Technology

[0002] Composite bags are multi-layered packaging bags made of two or more materials (such as plastic, aluminum foil, and paper) through a composite process. They have properties such as moisture resistance, oxygen barrier, and high temperature resistance, and are widely used in food, pharmaceutical, and chemical industries, such as vacuum packaging and electronic component protection.

[0003] In the production process of composite bags (such as medical urine bags), sealing detection is a critical step. The traditional method is to pressurize the inlet tube of the medical urine bag with air and keep it pressurized for a certain period of time to detect leaks. However, the equipment can only detect a single composite bag and cannot achieve batch testing, which limits production efficiency. In addition, the existing production equipment can only detect whether the composite bag is leaking, but cannot detect the location of the leak at the same time.

[0004] Therefore, this application provides a composite bag sealing performance testing device. Summary of the Invention

[0005] The purpose of this application is to solve at least one technical problem raised in the background art.

[0006] This application provides a composite bag sealing performance testing device, including an equipment base, a multi-station workbench, and an airtightness testing mechanism. The equipment base consists of a base, a mounting groove formed on the upper surface of the base, and a support column fixedly installed on the bottom wall of the mounting groove. The multi-station workbench includes a support ring rotatably mounted on the inner wall of the mounting groove via a bearing, a support cylinder fixedly installed on the upper end of the support ring, and a top ring fixedly installed on the upper end of the support cylinder. A drive mechanism for moving the multi-station workbench is provided inside the mounting groove. The inner wall of the support cylinder is rotatably connected to the surface of the support column via a bearing. The airtightness testing mechanism consists of a leak point detection component and a gas supply component. The gas supply component includes a nozzle and a gas supply pipe fixedly installed on one end of the nozzle. The other end of the gas supply pipe is connected to an external air pump via a slip ring. A pressure-holding valve is provided on the surface of the gas supply pipe.

[0007] By adopting the above technical solution, the support ring is rotatably installed on the inner wall of the mounting groove via bearings, and the support cylinder is vertically fixed to the upper end of the support ring to form a rotating frame. A top ring is installed on the upper end of the support cylinder, forming a ring-shaped multi-station workbench with the support cylinder. The number of air nozzles is set according to the workstation requirements. One end of the air supply pipe is connected to the air nozzle, and the other end is connected to an external air pump through an air slip ring to ensure a continuous gas supply during rotation. A pressure-holding valve is installed on the surface of the air supply pipe to control the gas pressure, and a pressure sensor is integrated into the air supply pipeline to monitor gas leakage in real time. During operation, the air inlet pipe on the composite bag to be tested is first tightly connected to the air nozzle, the external air pump is started, and the gas flows into the air nozzle through the air supply pipe and air slip ring and is injected into the interior of the composite bag. The pressure-holding valve is adjusted to the preset pressure, and then the pressure-holding valve is closed to stop the gas injection. The pressure sensor monitors the pressure change inside the composite bag. If the pressure drops, it indicates that there is a leak, and the system alarms at this time.

[0008] Preferably, the leak detection component consists of a cover plate and four water storage cylinders fixedly installed in a circumferential array on the upper surface of the support ring. There are four cover plates and four air nozzles. The four air nozzles are fixedly installed at the center of the four cover plates. The air nozzles are adapted to the air inlet pipe on the outer composite bag, and a retainer is provided at the lower end of the cover plate.

[0009] By adopting the above technical solution, the cover plate is circular with a diameter larger than that of the composite bag. Each cover plate has a vertically fixed air nozzle at its center. The inner diameter of the air nozzle is adapted to the outer diameter of the air inlet pipe of the composite bag. It is connected by threads or snaps to achieve quick assembly and disassembly. Four cylindrical water storage cylinders are fixedly installed on the upper surface of the support ring in a circumferential array. The material is transparent glass or pressure-resistant plastic, which makes it easy to observe the changes in the internal water level. After the composite bag is injected with gas, it is then immersed in the water in the storage cylinder. If there is a leak in the composite bag, the gas escaping from the leak will form bubbles in the water. The position of the bubbles can be observed visually.

[0010] Preferably, the drive mechanism includes an internal gear ring fixedly installed at the lower end of the support ring, a first motor fixedly installed on the bottom wall of the mounting groove, and a spur gear fixedly installed at the output end of the first motor, wherein the spur gear meshes with the internal gear ring for transmission.

[0011] By adopting the above technical solution, the internal gear ring is fixedly installed at the lower end of the support ring with bolts. Its axis is concentric with the support ring. When the first motor is powered on, the output shaft drives the spur gear to rotate. The spur gear meshes with the internal gear ring, converting the rotational motion into the circumferential motion of the support ring. The support ring drives the support cylinder and the top ring to rotate, so that its four stations are aligned with the feeding area in sequence.

[0012] Preferably, the retainer includes multiple sets of threaded holes arranged in a circumferential array on the lower surface of the cover plate, and six retaining rods threaded to the inner wall of the threaded holes.

[0013] By adopting the above technical solution, six retaining rods are installed in the threaded holes according to the size of the composite bag. At this time, the composite bag is located within the six retaining rods. When the composite bag is immersed in water, the retaining rods can restrict the position of the composite bag and prevent the composite bag from tilting.

[0014] Preferably, the leakage point monitoring component further includes a limiting assembly disposed on the upper surface of the support column. The limiting assembly includes a support plate fixedly installed on the upper end of the support column, four sets of guide holes arranged in a circumferential array on the upper surface of the top ring, four sets of guide rods slidably fitted on the inner walls of the four sets of guide holes, a roller seat fixedly installed on the upper end of the guide rod, a guide wheel disposed on the inner wall of the roller seat, and a pushing assembly disposed on the upper surface of the support plate for pushing the guide rods down.

[0015] Preferably, the upper ends of the four cover plates are fixedly connected to the lower ends of the four sets of guide rods, and a return spring is sleeved on the surface of the guide rod, with the two ends of the return spring abutting against the opposite surfaces of the top ring and the roller seat, respectively.

[0016] By adopting the above technical solution, the guide rod can be driven to descend under the action of the pushing component. At this time, the reset spring contracts. When the pushing component resets, the reset spring can drive the guide rod and the cover plate to reset.

[0017] Preferably, the pushing component includes a mounting cylinder fixedly mounted on the upper surface of the support plate, a guide groove formed in the inner wall of the mounting cylinder, a slider slidably fitted in the inner wall of the guide groove, a lead screw rotatably connected to the inner wall of the mounting cylinder, and a second motor fixedly mounted in the inner wall of the mounting cylinder for driving the lead screw to rotate, and the surface of the slider is provided with an internal thread that drives the lead screw helically.

[0018] By adopting the above technical solution, the second motor can drive the lead screw to rotate. When the lead screw rotates, the internal thread on the lead screw and the slider can be used for helical transmission, thereby driving the slider to slide up and down along the inner wall of the guide groove.

[0019] Preferably, the pushing component further includes a vertical rod fixedly installed at the lower end of the slider, a push plate fixedly installed at the lower end of the vertical rod, and an avoidance groove adapted to the push plate is provided on the upper surface of the support plate.

[0020] By adopting the above technical solution, when the slider descends, it will drive the push plate to contact the guide wheel. After the push plate continues to descend, it will enter the clearance groove. At this time, the highest point of the guide wheel will be on the same plane as the lower end of the support plate. At the same time, the cover plate descends, which will drive the inflated composite bag to be immersed in water. Then, the drive mechanism will work to drive the multi-station worktable to rotate. At this time, the guide wheel on the push plate will rotate 90 degrees to the lower end of the support plate. At this time, the guide wheel on the other station will rotate 90 degrees to the lower part of the push plate. When the pushing component drives the push plate to rise, the return spring drives the roller seat to reset and drive the cover plate to rise, thereby driving the composite bag in the water storage tank to rise. Then, the tested composite bag is taken out and replaced with a new composite bag.

[0021] Preferably, the mounting end of the air slip ring is fixedly mounted on the upper end of the mounting cylinder, and the upper surface of the top ring is provided with a guide component for guiding the air supply pipe.

[0022] Preferably, the guiding component includes guide arms fixedly mounted in a circumferential array on the upper end of the top ring, and a guide ring fixedly mounted on the surface of the guide arms, with the gas delivery pipe slidably fitted on the inner wall of the guide ring.

[0023] By adopting the above technical solution, the gas pipeline can be guided by the cooperation of the guide ring and the guide arm, thereby maintaining the stable posture of the gas pipeline.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. The composite bag sealing performance testing device described in this application achieves precise rotation of the multi-station workbench through the meshing transmission design of the drive mechanism and the internal gear ring, so that when one station is feeding, the other three stations can perform testing, which greatly improves the testing efficiency and is suitable for rapid quality screening of large batches of composite bags.

[0026] 2. The composite bag sealing performance testing device described in this application drives the cover plate to automatically rise and fall through the screw drive of the screw and slider, realizing the automatic rise of the cover plate after the test is completed, which facilitates the loading of materials by the operator.

[0027] 3. The composite bag sealing detection device described in this application integrates a pressure sensor into the gas supply pipeline and combines it with the closed-loop control of the pressure holding valve to monitor the pressure fluctuation inside the composite bag in real time. At the same time, in conjunction with the water immersion method for bubble observation, the location of air leakage in the composite bag can be directly observed. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0029] Figure 2 This is a side sectional view of an embodiment of this application;

[0030] Figure 3 This is a three-dimensional structural diagram of the multi-station workbench according to an embodiment of this application;

[0031] Figure 4 This is a three-dimensional structural diagram of the limiting component according to an embodiment of this application;

[0032] Figure 5 This is a schematic diagram of the cage three-dimensional structure according to an embodiment of this application;

[0033] Figure 6 This is a schematic diagram of the push plate three-dimensional structure according to an embodiment of this application;

[0034] Figure 7 yes Figure 1 Enlarged structural diagram at point A in the middle;

[0035] Figure 8 yes Figure 2 Enlarged structural diagram at point B.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100. Equipment base; 101. Base; 102. Support column;

[0038] 200. Multi-station worktable; 201. Support ring; 202. Support cylinder; 203. Top ring;

[0039] 300. Drive mechanism; 301. Internal gear ring; 302. First motor; 303. Spur gear;

[0040] 400. Air tightness testing mechanism; 401. Air nozzle; 402. Air supply pipe; 403. Air slip ring; 404. Cover plate; 405. Water storage tank; 406. Threaded hole; 407. Holding rod;

[0041] 500. Limiting component; 501. Support plate; 502. Guide rod; 503. Roller seat; 504. Return spring; 505. Mounting cylinder; 506. Lead screw; 507. Second motor; 508. Vertical rod; 509. Push plate; 510. Guide arm; 511. Guide ring; 512. Guide wheel; 513. Clearance groove; 514. Slider. Detailed Implementation

[0042] The following combination Figures 1 to 8 This application will be described in further detail below.

[0043] Example 1

[0044] Please refer to the following carefully. Figure 1 , Figure 2 and Figure 5A composite bag sealing performance testing device includes an equipment base 100, a multi-station workbench 200, and an airtightness testing mechanism 400. The equipment base 100 consists of a base 101, a mounting groove formed on the upper surface of the base 101, and a support column 102 fixedly installed on the bottom wall of the mounting groove. The multi-station workbench 200 includes a support ring 201 rotatably mounted on the inner wall of the mounting groove via bearings, a support cylinder 202 fixedly installed on the upper end of the support ring 201, and a top plate fixedly installed on the upper end of the support cylinder 202. The ring 203 and the mounting groove are equipped with a drive mechanism 300 that can drive the multi-station workbench 200 to move. The inner wall of the support cylinder 202 is rotatably connected to the surface of the support column 102 through a bearing. The air tightness detection mechanism 400 consists of a leak point detection component and an air supply component. The air supply component includes an air nozzle 401 and an air supply pipe 402 fixedly installed at one end of the air nozzle 401. The other end of the air supply pipe 402 is connected to an external air pump through an air slip ring 403. A pressure holding valve is provided on the surface of the air supply pipe 402.

[0045] Specifically, the support ring 201 is rotatably mounted on the inner wall of the mounting groove via bearings. The support cylinder 202 is vertically fixed to the upper end of the support ring 201, forming a rotating frame. A top ring 203 is installed on the upper end of the support cylinder 202, thus forming a ring-shaped multi-station workbench 200. The number of air nozzles 401 is set according to the workstation requirements. One end of the air supply pipe 402 is connected to the air nozzle 401, and the other end is connected to an external air pump through an air slip ring 403 to ensure a continuous gas supply during rotation. A pressure-holding valve is installed on the surface of the air supply pipe 402 for... The system controls gas pressure and uses a pressure sensor integrated into the gas pipeline to monitor gas leaks in real time. During operation, the air inlet pipe on the composite bag to be tested is first tightly connected to the air nozzle 401. The external air pump is then started, and gas flows through the gas pipeline 402 and the air slip ring 403 into the air nozzle 401 and is injected into the composite bag. The pressure holding valve is adjusted to the preset pressure, and then the pressure holding valve is closed to stop the gas injection. The pressure sensor monitors the pressure change inside the composite bag. If the pressure drops, it indicates that there is a leak, and the system will alarm.

[0046] Please refer to Figure 1 as well as Figure 4 and Figure 5 The leak detection component consists of a cover plate 404 and four water storage cylinders 405 fixedly installed in a circumferential array on the upper surface of the support ring 201. There are four cover plates 404 and four air nozzles 401. The four air nozzles 401 are fixedly installed at the center of the four cover plates 404 respectively. The air nozzles 401 are adapted to the air inlet pipe on the outer composite bag. The lower end of the cover plate 404 is provided with a retainer. The retainer includes multiple sets of threaded holes 406 opened in a circumferential array on the lower surface of the cover plate 404, and six retaining rods 407 threaded to the inner wall of the threaded holes 406.

[0047] Specifically, the cover plate 404 is circular with a diameter larger than that of the composite bag. Each cover plate 404 has a vertically fixed air nozzle 401 at its center. The inner diameter of the air nozzle 401 is adapted to the outer diameter of the air inlet pipe of the composite bag. It is connected by threads or snaps to achieve quick assembly and disassembly. Four cylindrical water storage cylinders 405 are fixedly installed on the upper surface of the support ring 201 in a circumferential array. The material is transparent glass or pressure-resistant plastic, which makes it easy to observe the changes in the internal water level. After the composite bag is injected with gas, it is then immersed in the water in the water storage cylinder 405. If there is a leak in the composite bag, the gas escaping from the leak will form bubbles in the water. The position of the bubbles can be observed visually. According to the size of the composite bag, six retaining rods 407 are installed in the threaded holes 406. At this time, the composite bag is located within the six retaining rods 407. When the composite bag is immersed in water, the retaining rods 407 can restrict the position of the composite bag and prevent the composite bag from tilting.

[0048] Please refer to Figure 2 and Figure 7 The drive mechanism 300 includes an internal gear ring 301 fixedly installed at the lower end of the support ring 201, a first motor 302 fixedly installed on the bottom wall of the mounting groove, and a spur gear 303 fixedly installed at the output end of the first motor 302, wherein the spur gear 303 meshes with the internal gear ring 301 for transmission.

[0049] Specifically, the internal gear ring 301 is fixedly installed at the lower end of the support ring 201 by bolts, with its axis concentric with the support ring 201. When the first motor 302 is powered on, the output shaft drives the spur gear 303 to rotate. The spur gear 303 meshes with the internal gear ring 301, converting the rotational motion into the circumferential motion of the support ring 201. The support ring 201 drives the support cylinder 202 and the top ring 203 to rotate, so that its four stations can be aligned with the feeding area in sequence.

[0050] The working principle of this embodiment is as follows: The composite bag to be tested is tightly connected to the air nozzle 401 through its own air inlet pipe. Then, the external air pump is started, and the gas enters the composite bag through the air supply pipe 402, the air slip ring 403, and the air nozzle 401. The pressure holding valve is adjusted to the preset pressure. When the preset pressure is reached, the gas injection is stopped. Then, the composite bag is immersed in the water in the water storage tank 405. The retaining rod 407 restricts the position of the composite bag to prevent tilting. Then, the first motor 302 is started to drive the multi-station workbench 200 to rotate, so that the four stations are aligned with the feeding area in sequence. The composite bag after air injection is rotated to other stations. At this time, the pressure sensor monitors the pressure change inside the composite bag. If the pressure drops, the system alarms, indicating that there is a leak. When the leaking composite bag is rotated back to the feeding station, the operator can observe the position of the air bubbles and locate the leak point visually. By using the pressure sensor integrated into the air supply pipeline and the air pressure closed-loop control of the pressure holding valve, the pressure fluctuation inside the composite bag can be monitored in real time. At the same time, with the water immersion method for air bubble observation, the location of the air leak in the composite bag can be directly observed.

[0051] Example 2

[0052] Compared with Embodiment 1, another implementation of this application is as follows:

[0053] Please refer to Figure 2 , Figure 3 , Figure 4 and Figure 6 The leak detection component also includes a limiting assembly 500 disposed on the upper surface of the support column 102. The limiting assembly 500 includes a support plate 501 fixedly installed on the upper end of the support column 102, four sets of guide holes arranged in a circumferential array on the upper surface of the top ring 203, four sets of guide rods 502 slidably fitted on the inner walls of the four sets of guide holes, roller seats 503 fixedly installed on the upper ends of the guide rods 502, guide wheels 512 disposed on the inner wall of the roller seats 503, and a pushing assembly disposed on the upper surface of the support plate 501 for pushing the guide rods 502 down. The pushing assembly includes components fixedly installed on the upper surface of the support plate 501. The mounting cylinder 505 has a guide groove on its inner wall, a slider 514 that slides on the inner wall of the guide groove, a lead screw 506 that is rotatably connected to the inner wall of the mounting cylinder 505, and a second motor 507 that is fixedly installed on the inner wall of the mounting cylinder 505 to drive the lead screw 506 to rotate. The surface of the slider 514 is provided with an internal thread that is helically driven by the lead screw 506. The pushing component also includes a vertical rod 508 that is fixedly installed at the lower end of the slider 514, a push plate 509 that is fixedly installed at the lower end of the vertical rod 508, and an avoidance groove 513 that is adapted to the push plate 509 on the upper surface of the support plate 501.

[0054] Specifically, the second motor 507 can drive the lead screw 506 to rotate. When the lead screw 506 rotates, it uses the internal thread of the lead screw 506 and the slider 514 for helical transmission, thereby driving the slider 514 to slide up and down along the inner wall of the guide groove.

[0055] Please refer to Figure 2 and Figure 4 The upper ends of the four cover plates 404 are fixedly connected to the lower ends of the four sets of guide rods 502 respectively, and the surface of the guide rods 502 is fitted with a return spring 504, and the two ends of the return spring 504 abut against the opposite surfaces of the top ring 203 and the roller seat 503 respectively.

[0056] Specifically, the push component causes the slider 514 and guide rod 502 to descend, at which point the return spring 504 contracts. When the push component resets, the return spring 504 causes the guide rod 502 and cover plate 404 to reset. After the slider 514 descends, it drives the push plate 509 to contact the guide wheel 512. After the push plate 509 continues to descend, it enters the clearance groove 513. At this time, the highest point of the guide wheel 512 will be on the same plane as the lower end of the support plate 501. At the same time, the descent of the cover plate 404 will drive the air-injected composite bag to be immersed. Once submerged in water, the drive mechanism 300 rotates the multi-station worktable 200. At this time, the guide wheel 512 on the push plate 509 rotates 90 degrees to the lower end of the support plate 501. Meanwhile, the guide wheel 512 on another station rotates 90 degrees to the lower part of the push plate 509. When the pushing component drives the push plate 509 to rise, the reset spring 504 drives the roller seat 503 to reset and drive the cover plate 404 to rise, thereby driving the composite bag in the water storage tank 405 to rise. Then, the tested composite bag is removed and replaced with a new one.

[0057] Please refer to Figure 1 , Figure 3 and Figure 8 The mounting end of the air slip ring 403 is fixedly mounted on the upper end of the mounting cylinder 505, and the upper surface of the top ring 203 is provided with a guide component for guiding the air supply pipe 402. The guide component includes a guide arm 510 fixedly mounted in a circumferential array on the upper end of the top ring 203, and a guide ring 511 fixedly mounted on the surface of the guide arm 510, and the air supply pipe 402 is slidably fitted on the inner wall of the guide ring 511.

[0058] Specifically, the guide ring 511 and the guide arm 510 are used to guide the gas pipe 402, thereby maintaining the stable posture of the gas pipe 402.

[0059] The working principle of this embodiment is as follows: In the initial state, the push plate 509 is in the clearance groove 513, and the four guide wheels 512 roll on the lower surface of the support plate 501. When the drive mechanism 300 rotates the composite bag to be inspected to the loading station, the guide wheels 512 at this station will rotate to below the push plate 509, and then drive the second motor 507 to rotate, which can drive the slider 514 to rise and synchronously drive the push plate 509 to rise. At this time, the reset spring 504 can drive the guide rod 502 and the cover plate 404 to rise to the reset position. When the cover plate After 404 is reset, the composite bag inside the water storage tank 405 can be moved out of the water storage tank 405, allowing the operator to replace the composite bag and inject air. After the replacement is completed, the drive component can drive the slider 514 and guide rod 502 to descend. At this time, the reset spring 504 contracts. When the slider 514 descends, it will drive the push plate 509 to contact the guide wheel 512. After the push plate 509 continues to descend, it will enter the clearance groove 513. At this time, the highest point of the guide wheel 512 will be on the same plane as the lower end of the support plate 501, and the cover plate 404 will descend. The process drives the inflated composite bag to immerse in water. Then, the drive mechanism 300 rotates the multi-station worktable 200. At this time, the guide wheel 512 on the push plate 509 rotates 90 degrees to the lower end of the support plate 501. Simultaneously, the guide wheel 512 on another worktable rotates 90 degrees to below the push plate 509. The driving component then continues to push the push plate 509 upwards. The return spring 504 then resets the roller seat 503, causing the cover plate 404 to rise, thereby driving the composite bag inside the water storage tank 405 to rise. This allows for further... After the composite bag is inspected, it is removed and replaced with a new composite bag. The device achieves precise rotation of the multi-station workbench 200 through the meshing transmission design of the drive mechanism 300 and the internal gear ring 301. This allows the other three stations to perform inspection work while one station is loading materials, greatly improving inspection efficiency. It is suitable for rapid quality screening of large batches of composite bags. At the same time, the drive component can drive the cover plate 404 to automatically rise and fall through the screw drive of the lead screw 506 and the slider 514. After the inspection is completed, the cover plate 404 will automatically rise, which facilitates the loading of materials by the operator.

Claims

1. A composite bag sealing performance testing device, characterized in that: include: The equipment base (100) is composed of a base (101), a mounting groove formed on the upper surface of the base (101), and a support column (102) fixedly installed in the bottom wall of the mounting groove. A multi-station worktable (200) includes a support ring (201) rotatably mounted on the inner wall of a mounting groove via bearings, a support cylinder (202) fixedly mounted on the upper end of the support ring (201), and a top ring (203) fixedly mounted on the upper end of the support cylinder (202). The mounting groove is provided with a drive mechanism (300) that can drive the multi-station worktable (200) to move. The inner wall of the support cylinder (202) is rotatably connected to the surface of the support column (102) via bearings. An airtightness testing mechanism (400) is composed of a leak detection component and an air supply component. The air supply component includes an air nozzle (401) and an air supply pipe (402) fixedly installed at one end of the air nozzle (401). The other end of the air supply pipe (402) is connected to an external air pump through an air slip ring (403). A pressure-holding valve is provided on the surface of the air supply pipe (402).

2. The composite bag sealing performance testing device according to claim 1, characterized in that, The leak detection component consists of a cover plate (404) and four water tanks (405) fixedly installed in a circumferential array on the upper surface of the support ring (201). There are four cover plates (404) and four air nozzles (401). The four air nozzles (401) are fixedly installed at the center of the four cover plates (404). The air nozzles (401) are adapted to the air inlet pipe on the outer composite bag, and a retainer is provided at the lower end of the cover plate (404).

3. The composite bag sealing performance testing device according to claim 1, characterized in that, The drive mechanism (300) includes an internal gear ring (301) fixedly installed at the lower end of the support ring (201), a first motor (302) fixedly installed on the bottom wall of the mounting groove, and a spur gear (303) fixedly installed at the output end of the first motor (302), and the spur gear (303) meshes with the internal gear ring (301) for transmission.

4. The composite bag sealing performance testing device according to claim 2, characterized in that, The retainer includes multiple sets of threaded holes (406) arranged in a circumferential array on the lower surface of the cover plate (404), and six retaining rods (407) threaded to the inner wall of the threaded holes (406).

5. The composite bag sealing performance testing device according to claim 2, characterized in that, The leakage point monitoring component also includes a limiting component (500) disposed on the upper surface of the support column (102). The limiting component (500) includes a support plate (501) fixedly installed on the upper end of the support column (102), four sets of guide holes arranged in a circumferential array on the upper surface of the top ring (203), four sets of guide rods (502) slidably fitted on the inner walls of the four sets of guide holes, a roller seat (503) fixedly installed on the upper end of the guide rod (502), a guide wheel (512) disposed on the inner wall of the roller seat (503), and a pushing component disposed on the upper surface of the support plate (501) for pushing the guide rod (502) down.

6. The composite bag sealing performance testing device according to claim 5, characterized in that, The upper ends of the four cover plates (404) are fixedly connected to the lower ends of the four sets of guide rods (502), and the surface of the guide rods (502) is fitted with a return spring (504), and the two ends of the return spring (504) abut against the opposite surfaces of the top ring (203) and the roller seat (503).

7. The composite bag sealing performance testing device according to claim 6, characterized in that, The pushing component includes a mounting cylinder (505) fixedly mounted on the upper surface of the support plate (501), a guide groove formed on the inner wall of the mounting cylinder (505), a slider (514) slidably fitted on the inner wall of the guide groove, a lead screw (506) rotatably connected to the inner wall of the mounting cylinder (505), and a second motor (507) fixedly mounted on the inner wall of the mounting cylinder (505) for driving the lead screw (506) to rotate. The surface of the slider (514) is provided with an internal thread that is helically driven with the lead screw (506).

8. The composite bag sealing performance testing device according to claim 7, characterized in that, The pushing component also includes a vertical rod (508) fixedly installed at the lower end of the slider (514), a push plate (509) fixedly installed at the lower end of the vertical rod (508), and an avoidance groove (513) adapted to the push plate (509) is provided on the upper surface of the support plate (501).

9. The composite bag sealing performance testing device according to claim 1, characterized in that, The mounting end of the air slip ring (403) is fixedly mounted on the upper end of the mounting cylinder (505), and the upper surface of the top ring (203) is provided with a guide component for guiding the air supply pipe (402).

10. A composite bag sealing performance testing device according to claim 9, characterized in that, The guiding component includes a guide arm (510) fixedly mounted in a circumferential array on the upper end of the top ring (203), and a guide ring (511) fixedly mounted on the surface of the guide arm (510), and the gas pipe (402) is slidably fitted on the inner wall of the guide ring (511).

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