A device for detecting the air tightness of a zip-top can

Abstract

The application discloses a zip-top can airtightness detection device, relates to the zip-top can airtightness detection technical field.A zip-top can airtightness detection device, including device main part, pneumatic cylinder and zip-top can, the top of device main part is fixedly installed pneumatic cylinder, the inside of device main part is placed zip-top can, the inside of device main part is provided with bottom support adjusting assembly, the side of device main part is fixedly installed pneumatic detection assembly, the bottom of pneumatic cylinder is movably connected with top compression assembly;The zip-top can airtightness detection device, by strictly controlling the pressure of the compressed air filled into the non-gas-containing can body zip-top can in the range of zero point one to zero point two megapascal, and by means of the overpressure protection mechanism in the side pressure pipe, when the pressure exceeds zero point two megapascal, the original form of the detection sample zip-top can is ensured.

Description

Technical Field

[0001] This invention relates to the field of aluminum can airtightness testing technology, specifically to an aluminum can airtightness testing device. Background Technology

[0002] The water immersion observation method for spot-checking the airtightness of open-ended semi-molded cans is simple and efficient, and the specific steps are as follows: First, perform a visual inspection on the spot-checked open-ended semi-molded cans, and remove cans with obvious deformation or damage. Use a special tool to fill the can with 0.1-0.2MPa compressed air. Next, prepare a water tank filled with clean water, and you can add a small amount of ink to facilitate observation. The water depth should be enough to completely submerge the open-ended semi-molded can. Then, immerse the open-ended semi-molded can in the water, ensuring that the can body, rolled edge and all joints are completely submerged. Let it stand for 10-30 seconds, and carefully check whether there are continuous bubbles in each part. No bubbles or no more than 2 sporadic bubbles within 3 seconds is acceptable. If a certain part continues to bubble (such as more than 1 bubble per second at the rolled edge), it is determined to be leaking. Finally, take out the acceptable cans and wipe them dry, and mark and isolate the unacceptable cans. This method takes about 1 minute to test a single can and is suitable for random sampling or preliminary screening on the production line.

[0003] When filling non-air-containing tanks with compressed air, the pressure must be strictly controlled within the range of 0.1-0.2 MPa. Overpressure > 0.25 MPa may cause the tank to bulge, crack at the edges, or even burst, resulting in sample failure and safety risks. Furthermore, a deformed tank cannot represent the normal sealing performance of the product. After testing, the tank must be wiped gently with a clean, soft cloth immediately to remove surface moisture and allowed to air dry completely. Excessive wiping force may cause slight deformation of the tank, affecting its appearance. Residual moisture, especially in iron tanks, can easily cause corrosion in weak areas such as the edges, damaging the structural integrity and preventing qualified samples from being properly circulated. Summary of the Invention

[0004] The purpose of this invention is to provide a device for testing the airtightness of aluminum cans. By setting a pressure relief mechanism, the internal structure can be automatically opened when the pressure exceeds 0.2 MPa, allowing the gas to be released and quickly returning to its original state. Furthermore, by setting a separate pipe and a sealed space, the can can be prevented from being submerged in water, thus facilitating testing and solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a device for detecting the airtightness of an aluminum can, comprising a device body, a pressure cylinder, and an aluminum can. The pressure cylinder is fixedly mounted on the top of the device body, and the aluminum can is placed inside the device body. A bottom support adjustment assembly is provided inside the device body, and a pressure detection assembly is fixedly mounted on the side of the device body. A top pressing assembly is movably connected to the bottom of the pressure cylinder. The bottom support adjustment assembly includes a support adjustment groove, a main support block, and an auxiliary support column. Two symmetrical support adjustment grooves are formed inside the device body. The main support block is movably sleeved between the support adjustment grooves, and an auxiliary support column is movably sleeved inside the support adjustment groove; the air pressure detection assembly includes an air pressure detection tube and a transparent cylinder inside, the air pressure detection tube is fixedly installed on the side of the main body of the device, and the transparent cylinder is fixedly installed on the top of the air pressure detection tube; the top pressing assembly includes a top pressing plate and side pressing tubes inside, the bottom of the air pressure cylinder passes through the top of the main body of the device and is movably connected to the top pressing plate, two symmetrical side pressing tubes are fixedly installed on the bottom of the top pressing plate, and the bottom middle section of the top pressing plate is fixedly connected to the top of the main support block.

[0006] Preferably, the bottom of the main support block is movably fitted with an intermediate adjusting block, the bottom of the intermediate adjusting block is movably fitted with a bottom support seat, and both sides of the top of the intermediate adjusting block are fixedly connected with linkage rods. The end of the linkage rod away from the intermediate adjusting block extends into the interior of the support adjusting groove and is fixedly connected to the bottom of the auxiliary support column.

[0007] Preferably, a limiting plate is fixedly installed at the bottom of the main support block, the outer wall of the limiting plate is movably connected to the inside of the intermediate adjusting block, a spring limiting sleeve rod is fixedly installed at the bottom of the inner cavity of the intermediate adjusting block, and a buffer spring is movably connected to the outer wall of the spring limiting sleeve rod. The bottom of the intermediate adjusting block is also fixedly installed with a limiting plate and movably connected to the top of the bottom support seat.

[0008] Preferably, a sealing detection chamber is fixedly installed inside the support adjustment groove. A chamber side slit is formed between the sealing detection chamber and the support adjustment groove. Ventilation holes are formed through the bottom of both the sealing detection chamber and the support adjustment groove. Movable sealing grooves are formed on both sides of the bottom of the inner cavity of the sealing detection chamber. A connecting push rod is movably sleeved inside the movable sealing groove. A sealing piston is fixedly installed at the bottom of the connecting push rod. A side sealing cylinder is movably sleeved at the bottom of the sealing piston. A sealing adjustment tube is fixedly installed on one side of the bottom of the side sealing cylinder. An adjustment plug is movably sleeved in the inner cavity of the top of the sealing adjustment tube. An extension rod is fixedly connected to the outer wall of the adjustment plug. A protruding adjustment seat side groove is fixedly connected to the top of the sealing adjustment tube. The adjustment seat side groove is located at both ends of the sealing detection chamber. The extension rod extends into the inner cavity of the adjustment seat side groove and is fixedly connected to a linkage clamping block at the end away from the sealing adjustment tube.

[0009] Preferably, the end of the pressure detection tube away from the transparent cylinder passes through the sealed detection chamber and the auxiliary support column, and the end near the sealed detection chamber is fitted with a piston linkage block. A limiting horizontal plate is fixedly installed inside the pressure detection tube. A sensing rod is movably sleeved inside the limiting horizontal plate. One end of the sensing rod is fixedly connected to the piston linkage block. A transmission rod is fixedly connected to the end of the sensing rod away from the piston linkage block. A transmission spring is movably sleeved on the outer wall of the transmission rod. A compression contact is fixedly connected to the end of the transmission rod away from the sensing rod. A contact linkage rod is fixedly connected to the bottom of the piston linkage block. The bottom of the contact linkage rod is fixedly connected to the top of the linkage clamp block. The transparent cylinder is filled with detection liquid. The outlet of the pressure detection tube away from the auxiliary support column is located inside the limiting horizontal plate.

[0010] Preferably, the top pressing assembly further includes a pressing buffer block, an adjusting spring, a side adjusting plate, an adjusting base plate, a drive connecting column, a central guide rod, and a pressure adjusting disc. A pressing buffer block is fixedly installed inside the side pressing tube. An adjusting spring is attached to the bottom of the pressing buffer block. Side adjusting plates are fixedly connected to both ends of the adjusting spring. An adjusting base plate is attached to the end of the side adjusting plate away from the pressing buffer block. A drive connecting column is fixedly connected to the top of the top pressing plate. The top of the drive connecting column is movably sleeved inside the pneumatic cylinder. A central guide rod is fixedly installed inside the adjusting base plate. A pressure adjusting disc is fixedly connected to the end of the central guide rod away from the adjusting base plate. Adjusting disc side holes are opened at both ends of the pressure adjusting disc. The adjusting spring, pressing buffer block, and side adjusting plate are all movably sleeved with the outer wall of the central guide rod.

[0011] Preferably, the interior of the pressing buffer block includes a buffer bottom groove, a bottom top block, a side limiting groove, and a side guide groove. The bottom of the pressing buffer block has a buffer bottom groove, and the bottom top blocks are movably fitted inside both sides of the buffer bottom groove. Symmetrical side limiting grooves and side guide grooves are opened on both sides of the interior of the pressing buffer block.

[0012] Preferably, a top block drive column is fixedly installed on the top of the bottom block, a drive column sleeve is movably sleeved on the outer wall of the top block drive column, the top of the drive column sleeve is fixedly connected to the inside of the pressing buffer block, a return spring rod is fixedly installed on the top of the inner cavity of the drive column sleeve, and a spring rod is movably sleeved on the outer wall of the return spring rod, the bottom of the spring rod and the top of the top block drive column are in contact with each other, and the inside of the top block drive column and the outer wall of the return spring rod are movably sleeved, a side adjustment tube is fixedly installed on one side of the top of the drive column sleeve, an adjustment rod is movably sleeved on the inside of the side adjustment tube, a drive block is fixedly connected to the outer wall of the adjustment rod, a stabilizing slider is fixedly connected to the end of the drive block away from the adjustment rod, a side locking tube is fixedly installed on one side of the bottom of the drive column sleeve, a locking pin is movably sleeved on the inside of the side locking tube, a pin linkage rod is fixedly connected to the outer wall of the locking pin, and a ball bearing is movably connected to the end of the pin linkage rod away from the locking pin.

[0013] Preferably, when the pressure at the bottom of the pressure regulating disc is greater than 0.2 MPa, it will be lifted up; when the pressure at the bottom of the pressure regulating disc is less than 0.2 MPa, it will contract and adhere to the top of the top pressing plate.

[0014] Preferably, the top and bottom of the top block drive column are filled with air, and when the top block drive column moves upward, a suction force is generated at the bottom, and when the top block drive column moves downward, a suction force is generated at the top.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This type of can airtightness testing device strictly controls the pressure of compressed air filling non-gas-containing cans within the range of 0.1 to 0.2 MPa. Utilizing an overpressure protection mechanism inside the side pressure tube, when the pressure exceeds 0.2 MPa, the gas pushes up the pressure regulating plate, driving the central guide rod to adjust the original plate, thus releasing pressure. This effectively prevents can bulging, edge cracking, or bursting. This not only reduces the safety risks caused by can breakage but also prevents damage to parts in direct contact with the can, such as the pressure plate at the top of the side pressure tube, from abnormal compression due to can deformation. Simultaneously, it ensures that the tested cans retain their original shape, avoiding the influence of deformation on the judgment of the sealing performance of normal products, and guaranteeing the accuracy of the test results output from the transparent cylinder of the air pressure testing tube and other testing components.

[0017] 2. This type of can airtightness testing device directly detects airtightness through changes in gas pressure. It eliminates the need to immerse the can in water or perform post-testing wiping. This avoids potential corrosion problems in weak areas like curling edges caused by moisture contact with the can, ensuring the integrity of the can structure and allowing qualified samples to fully represent the sealing performance and flow status of normal products. Furthermore, it reduces the chance of moisture contacting components such as the support adjustment groove, auxiliary support column, and side pressure pipe, lowering the risk of damage due to corrosion and extending the device's lifespan. It also eliminates the need for wiping and drying, simplifying the testing process and improving efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the overall internal structure of the main body of the device of the present invention;

[0020] Figure 3 This is a schematic diagram of the overall cross-sectional structure of the intermediate adjustment block of the present invention;

[0021] Figure 4 In this invention Figure 3 A schematic diagram of the overall enlarged structure at point A;

[0022] Figure 5 This is a schematic diagram of the internal cross-section of the support adjustment groove in this invention;

[0023] Figure 6 This is a cross-sectional view of the air pressure detection tube in this invention;

[0024] Figure 7 This is a schematic diagram of the overall internal structure of the transparent tube in this invention;

[0025] Figure 8 This is a schematic diagram of the overall structure of the top pressing assembly in this invention;

[0026] Figure 9 This is a schematic diagram of the overall structure of the bottom of the compression buffer block in this invention;

[0027] Figure 10 This is a schematic diagram of the overall internal structure of the drive column sleeve in this invention.

[0028] In the diagram: 1. Main body of the device; 2. Pneumatic cylinder; 3. Bottom support adjustment assembly; 31. Support adjustment groove; 32. Main support block; 33. Auxiliary support column; 35. Intermediate adjustment block; 36. Bottom support seat; 37. Linkage rod; 38. Limiting plate; 39. Spring limiting sleeve rod; 310. Buffer spring; 4. Pneumatic pressure detection assembly; 41. Pneumatic pressure detection tube; 42. Transparent cylinder; 43. Limiting horizontal plate; 44. Transmission rod; 45. Transmission spring; 46. Extrusion contact; 47. Sensing rod; 48. Piston linkage block; 49. Contact linkage rod; 410. Detection fluid; 5. Top pressing assembly; 51. Top pressing plate; 52. Side pressing tube; 53. Pressing buffer block; 54. Adjusting spring; 55. Side adjusting plate; 56. Adjusting plate; 57. Drive connecting column; 58. 59. Center guide rod; 510. Pressure regulating disc; 52. Adjusting disc side hole; 6. Aluminum can; 7. Buffer bottom groove; 71. Bottom top block; 72. Side limiting groove; 73. Side guide groove; 74. Drive column sleeve; 75. Top block drive column; 76. Reset spring rod; 77. Spring rod; 78. Side adjusting tube; 79. Adjusting rod; 710. Drive block; 711. Stabilizing slider; 712. Side locking tube; 714. Locking pin; 715. Pin linkage rod; 713. Ball bearing; 8. Sealing detection chamber; 81. Chamber side seam; 82. Vent hole; 83. Movable sealing groove; 84. Connecting push rod; 85. Sealing piston; 86. Side sealing cylinder; 87. Sealing adjusting tube; 88. Adjusting plug; 89. Extension rod; 810. Adjusting seat side groove; 811. Linkage clamp block. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1-10 The present invention provides a technical solution for a can airtightness testing device: a can airtightness testing device includes a device body 1, a pressure cylinder 2 and a can 6. The pressure cylinder 2 is fixedly installed on the top of the device body 1. The can 6 is placed inside the device body 1. A bottom support adjustment component 3 is provided inside the device body 1. A pressure testing component 4 is fixedly installed on the side of the device body 1. A top pressing component 5 is movably connected to the bottom of the pressure cylinder 2.

[0031] The bottom support adjustment assembly 3 includes a support adjustment groove 31, a main support block 32 and an auxiliary support column 33. The main body 1 of the device has two symmetrical support adjustment grooves 31. The main support block 32 is movably connected between the two symmetrical support adjustment grooves 31. The auxiliary support column 33 is movably connected inside the support adjustment groove 31.

[0032] The air pressure detection assembly 4 includes an air pressure detection tube 41 and a transparent cylinder 42 inside. The air pressure detection tube 41 is fixedly installed on the side of the main body 1 of the device, and the transparent cylinder 42 is fixedly installed on the top of the air pressure detection tube 41.

[0033] The top pressing assembly 5 includes a top pressing plate 51 and side pressing pipes 52. The bottom of the pneumatic cylinder 2 passes through the top of the main body 1 and is movably connected to the top pressing plate 51. Two symmetrical side pressing pipes 52 are fixedly installed at the bottom of the top pressing plate 51. The bottom middle section of the top pressing plate 51 is fixedly connected to the top of the main support block 32.

[0034] During operation, the aluminum can 6 can be placed on top of the auxiliary support column 33, which is movably connected inside the support adjustment groove 31. At this time, the pneumatic cylinder 2 is activated, pushing the top pressing plate 51 downwards. During this movement, the top pressing plate 51 causes the main support block 32 to retract into the main body 1. As the main support block 32 retracts into the main body 1, the auxiliary support column 33, movably connected inside the support adjustment groove 31, is driven downwards by the main support block 32. Since both the aluminum can 6 and the support adjustment groove 31 are open, when the top pressing plate 51 and the support adjustment groove 31 are in contact, the opening of the support adjustment groove 31 is sealed by the top pressing plate 51, storing air inside. The aluminum can 6, although open, is now retracted into the support adjustment groove 31, forming a space within it. In the enclosed space, air is also present inside the can 6. This allows the can 6 to retract into the support adjustment groove 31. Simultaneously, the top pressing plate 51 covers the top of the support adjustment groove 31, forming a seal. The side pressing tube 52, fixedly installed at the bottom, extends into the can 6 placed inside the support adjustment groove 31, compressing the gas stored inside the can 6 and increasing its pressure. When there is a gap inside the can 6, the gas will escape through the gap. At this time, the gas density stored inside the support adjustment groove 31 will increase and be transported into the transparent cylinder 42 through the gas pressure detection tube 41 for detection. It should be noted that when there is no gap inside the can 6, if the gas pressure exceeds 0.2 MPa during the compression process, it can be discharged through the side pressing tube 52 to avoid excessive gas pressure inside the can 6 causing deformation.

[0035] Please see Figure 2-4The bottom of the main support block 32 is movably sleeved with an intermediate adjustment block 35, the bottom of the intermediate adjustment block 35 is movably sleeved with a bottom support seat 36, and the top two sides of the intermediate adjustment block 35 are fixedly connected with linkage rods 37. The end of the linkage rod 37 away from the intermediate adjustment block 35 extends into the interior of the support adjustment groove 31 and is fixedly connected to the bottom of the auxiliary support column 33.

[0036] A limiting plate 38 is fixedly installed at the bottom of the main support block 32. The outer wall of the limiting plate 38 is movably sleeved with the inside of the intermediate adjusting block 35. A spring limiting sleeve rod 39 is fixedly installed at the bottom of the inner cavity of the intermediate adjusting block 35. A buffer spring 310 is movably sleeved on the outer wall of the spring limiting sleeve rod 39. The bottom of the intermediate adjusting block 35 is also fixedly installed with a limiting plate 38 and is movably sleeved with the top of the bottom support base 36.

[0037] When the top pressing plate 51 moves downward, the main support block 32 fixedly connected to the bottom will push the middle adjusting block 35 to retract into the bottom support seat 36. During the retraction process, the linkage rods 37 fixedly connected to both sides of the middle adjusting block 35 will also move downward. This allows the auxiliary support column 33 fixedly connected to the top of the linkage rod 37 to move downward along the inside of the support adjustment groove 31. As the auxiliary support column 33 moves downward, the aluminum can 6 placed on top can move downward with the auxiliary support column 33, thus retracting and being placed inside the support adjustment groove 31. When the bottom of the inner cavity of the middle adjusting block 35 and the bottom support seat 36 come into contact with each other, the linkage rod 37 will no longer pull the auxiliary support column 33 downward. It should be noted that a spring limiting sleeve 39 is fixedly installed inside the middle adjusting block 35, and a buffer spring 3 is movably sleeved on the outer wall of the spring limiting sleeve 39. 10. During the downward movement of the main support block 32, the limiting plate 38 and the buffer spring 310 will be in contact with each other. The buffer spring 310 forms a support, which can push the intermediate adjusting block 35 to retract into the bottom support seat 36. When the intermediate adjusting block 35 retracts into the bottom support seat 36, the thrust of the main support block 32 will continue. This causes the main support block 32 to retract into the intermediate adjusting block 35. The thrust generated during the retraction will be greater than the supporting force of the buffer spring 310 that is movably sleeved on the outer wall of the spring limiting sleeve 39. This causes the buffer spring 310 to deform and retract. The main support block 32 can continue to retract into the intermediate adjusting block 35. This allows the side pressure tube 52, which is fixedly connected to the bottom of the top pressing plate 51, to extend into the interior of the support adjusting groove 31 and the interior of the can 6 to form a piston engagement, thereby squeezing the internal gas for testing.

[0038] Please see Figure 5-6Based on the above embodiments, there is no clamping mechanism during the process of the can 6 retracting into the support adjustment groove 31. This makes the can 6 prone to slight shaking, causing positional displacement. When the side pressure tube 52 extends into the support adjustment groove 31, it cannot be aligned with the top of the can 6, which can easily cause compression and deformation of the outer wall of the can 6. Therefore, to solve the above problems,

[0039] A sealing detection chamber 8 is fixedly installed inside the support adjustment groove 31. A chamber side slit 81 is opened between the sealing detection chamber 8 and the support adjustment groove 31. A vent hole 82 is opened through the bottom of both the sealing detection chamber 8 and the support adjustment groove 31. Movable sealing grooves 83 are opened on both sides of the bottom of the inner cavity of the sealing detection chamber 8. A connecting push rod 84 is movably sleeved inside the movable sealing groove 83. A sealing piston 85 is fixedly installed at the bottom of the connecting push rod 84. A side sealing cylinder 86 is movably sleeved at the bottom of the sealing piston 85. A sealing adjustment tube 87 is fixedly installed on one side of the bottom of the side sealing cylinder 86. An adjustment plug 88 is movably sleeved in the inner cavity of the top of the sealing adjustment tube 87. An extension rod 89 is fixedly connected to the outer wall of the adjustment plug 88. A protruding adjustment seat side groove 810 is fixedly connected to the top of the sealing adjustment tube 87. The adjustment seat side groove 810 is located at both ends of the sealing detection chamber 8. The extension rod 89 extends into the inner cavity of the adjustment seat side groove 810 and is fixedly connected to a linkage clamp 811 at the end away from the sealing adjustment tube 87.

[0040] When the linkage rod 37 drives the auxiliary support column 33 to the bottom of the sealing detection chamber 8, the bottom of the auxiliary support column 33 will come into contact with the top of the connecting push rod 84. During the contact with the connecting push rod 84, the connecting push rod 84 will be subjected to a downward thrust, causing the sealing piston 85, which is fixedly connected to the bottom of the connecting push rod 84, to move downward along the top of the side sealing cylinder 86. During the downward movement, the air stored inside the side sealing cylinder 86 will be squeezed. At this time, the gas stored in the side sealing cylinder 86 will be transported to the inside of the sealing regulating tube 87. When the gas enters the inside of the sealing regulating tube 87, it can push the regulating plug 88 to move forward. At this time, the extension rod 89, which is fixedly connected to the outer wall of the regulating plug 88, can extend the linkage clamp 811, which is movably sleeved inside the regulating seat side groove 810, out. During the extension of the linkage clamp 811, it will come into contact with the offset can 6 and push it to move to the middle section. When the linkage clamps 811 at both ends come into contact with the can, they can both clamp and calibrate, making it convenient to squeeze the gas stored inside the can 6.

[0041] Please see Figure 6-7The end of the air pressure detection tube 41 away from the transparent cylinder 42 passes through the sealed detection chamber 8 and the auxiliary support column 33, and the end closer to the sealed detection chamber 8 is fitted with a piston linkage block 48. A limiting horizontal plate 43 is fixedly installed inside the air pressure detection tube 41. A sensing rod 47 is movably sleeved inside the limiting horizontal plate 43. One end of the sensing rod 47 is fixedly connected to the piston linkage block 48, and the end of the sensing rod 47 away from the piston linkage block 48 is fixedly connected to a transmission rod 44. A transmission spring 45 is movably sleeved on the outer wall of the transmission rod 44. A compression contact 46 is fixedly connected to the end of the transmission rod 44 away from the sensing rod 47. A contact linkage rod 49 is fixedly connected to the bottom of the piston linkage block 48. The bottom of the contact linkage rod 49 is fixedly connected to the top of the linkage clamp block 811. The transparent cylinder 42 is filled with detection liquid 410. The outlet of the end of the air pressure detection tube 41 away from the auxiliary support column 33 is located inside the limiting horizontal plate 43.

[0042] When the aforementioned linkage clamp 811 extends out from the inside of the adjusting seat side groove 810, the contact linkage rod 49 fixedly connected at the top will drive the piston linkage block 48 to move forward. During the forward movement of the piston linkage block 48, the sensing rod 47 fixedly connected to its outer wall will drive the transmission rod 44 to extend out from the inside of the air pressure detection tube 41. During the extension process, the extrusion contact 46 fixedly connected to the outer wall of the transmission rod 44 will extrude the transmission spring 45 movably sleeved on the outer wall of the transmission rod 44, so that the transmission spring 45 can initially store force. At the same time, the inside of the air pressure detection tube 41 is also opened. When the gas density in the internal space increases during the test, the gas will directly enter the inside of the air pressure detection tube 41, and then be transported through the air pressure detection tube 41 to the detection liquid 410 stored inside the transparent cylinder 42, so that bubbles are generated inside the detection liquid 410, thereby facilitating the detection. When the test is completed, the pneumatic cylinder 2 can be activated to move the top pressing plate 51 upward. At this time, the main support block 32, the intermediate adjusting block 35 and the bottom support seat 36 fixedly connected to the bottom of the top pressing plate 51 will be restored in sequence. Similarly, the auxiliary support column 33 fixedly connected to the top of the linkage rod 37 will be pushed upward, thereby eliminating the compression on the connecting push rod 84. Therefore, the transmission spring 45 movably sleeved on the outer wall of the aforementioned transmission rod 44 will be reset. During the reset process of the transmission spring 45, the transmission rod 44, the sensing rod 47 and the piston linkage block 48 will be pulled back to their original positions. The contact linkage rod 49 fixedly connected to the bottom of the piston linkage block 48 will also move accordingly, causing the linkage clamp 811 fixedly connected to the bottom to be pushed back to its original position, thereby canceling the limit. This makes it easy for the can 6 to detach from the inside of the support adjusting groove 31 and to be taken out for the next sampling test.

[0043] Please see Figure 8-10The top pressing assembly 5 also includes a pressing buffer block 53, an adjusting spring 54, a side adjusting plate 55, an adjusting base plate 56, a drive connecting column 57, a central guide rod 58, and a pressure adjusting disc 59. The pressing buffer block 53 is fixedly installed inside the side pressing tube 52. The adjusting spring 54 is attached to the bottom of the pressing buffer block 53. The side adjusting plates 55 are fixedly connected to both ends of the adjusting spring 54. The adjusting base plate 56 is attached to the end of the side adjusting plate 55 away from the pressing buffer block 53. The top of the top pressing plate 51 is fixedly connected to the drive connecting column 57. The top of the drive connecting column 57 is movably connected to the inside of the pneumatic cylinder 2. The inside of the adjusting plate 56 is fixedly installed with a central guide rod 58. The end of the central guide rod 58 away from the adjusting plate 56 is fixedly connected to a pressure adjusting plate 59. Both ends of the pressure adjusting plate 59 are provided with adjusting plate side holes 510. The adjusting spring 54, the pressing buffer block 53 and the side adjusting plate 55 are all movably connected to the outer wall of the central guide rod 58.

[0044] The interior of the pressing buffer block 53 includes a buffer bottom groove 7, a bottom top block 71, a side limiting groove 72 and a side guide groove 73. The bottom of the pressing buffer block 53 is provided with a buffer bottom groove 7, and the bottom top block 71 is movably sleeved on both sides of the buffer bottom groove 7. The interior of the pressing buffer block 53 is provided with symmetrical side limiting grooves 72 and side guide grooves 73 on both sides.

[0045] A top block drive post 75 is fixedly installed on the top of the bottom block 71. A drive post sleeve 74 is movably sleeved on the outer wall of the top block drive post 75. The top of the drive post sleeve 74 is fixedly connected to the inside of the pressing buffer block 53. A return spring rod 76 is fixedly installed on the top of the inner cavity of the drive post sleeve 74, and a spring rod 77 is movably sleeved on the outer wall of the return spring rod 76. The bottom of the spring rod 77 and the top of the top block drive post 75 are in contact with each other, and the inside of the top block drive post 75 is movably sleeved on the outer wall of the return spring rod 76. A side... The side adjusting tube 78 has an adjusting rod 79 movably sleeved inside it. A driving block 710 is fixedly connected to the outer wall of the adjusting rod 79. A stabilizing slider 711 is fixedly connected to the end of the driving block 710 away from the adjusting rod 79. A side locking tube 712 is fixedly installed on one side of the bottom of the driving column sleeve 74. A locking pin 714 is movably sleeved inside the side locking tube 712. A pin linkage rod 715 is fixedly connected to the outer wall of the locking pin 714. A ball bearing 713 is movably connected to the end of the pin linkage rod 715 away from the locking pin 714.

[0046] A squeeze plug is detachably installed at the bottom of the side pressure tube 52, and a round hole is opened in the middle of the squeeze plug. The round hole is connected to the inside of the side pressure tube 52. When the pneumatic cylinder 2 works, it will drive the drive connecting column 57 to extend downward. During this process, the top pressing plate 51 fixedly connected to the bottom of the drive connecting column 57 will drive the side pressure tube 52 and the squeeze plug to extend into the inside of the can 6. At this time, the gas stored inside the can 6 will be compressed, and its internal pressure will increase accordingly. The increased gas pressure will be transported to the inside of the side pressure tube 52 through the round hole. Then the gas passes through the pressing buffer block 53 and contacts the bottom of the pressure regulating plate 59. When the gas pressure exceeds 0.25 MPa, it will lift the pressure regulating plate 59 to achieve timely pressure relief and prevent the can 6 from deforming due to excessive pressure during operation.

[0047] During the process of the pressure regulating plate 59 being lifted, the central guide rod 58 fixedly connected to its bottom extends out from the inside of the side pressure tube 52, causing the regulating plate 56 fixedly connected to the bottom of the central guide rod 58 to move upward inside the side pressure tube 52. When moving upward, the regulating plate 56 will fit against the side regulating plate 55 and squeeze the regulating spring 54 movably sleeved on the outer wall of the central guide rod 58, causing the regulating spring 54 to undergo initial deformation. When the internal gas pressure is less than 0.25 MPa, the regulating spring 54 will reset and push the regulating plate 56 back to its original position, thereby pulling the central guide rod 58 and the pressure regulating plate 59 fixedly connected to the regulating plate 56 back to their original positions. The pressure regulating plate 59 can then fit against the top of the top pressing plate 51 to form a seal and prevent continuous gas leakage.

[0048] When the aforementioned adjusting spring 54 is compressed, the side adjusting plate 55 near the end of the compression buffer block 53 extends into the buffer bottom groove 7 and compresses the bottom top block 71 that is movably sleeved inside the buffer bottom groove 7. After the bottom top block 71 is compressed, the top block drive column 75 fixedly connected to its top will move upward along the outer wall of the return spring rod 76, and at the same time compress the spring rod 77 that is movably sleeved on the outer wall of the return spring rod 76. It should be noted that the top and bottom of the top block drive column 75 are filled with air, and the bottom top block 71 and the drive column can be connected. A sealing mechanism is added to the connection of sleeve 74. The sealing mechanism can be made of rubber. During the upward movement of the top block drive column 75, the air filled at its top will be squeezed and transported to the side adjustment tube 78 and continuously stored. As the gas density increases, it will push the adjustment rod 79 to extend out from the side adjustment tube 78. When the adjustment rod 79 extends, the drive block 710 and the stabilizing slider 711 fixedly connected to its outer wall will extend out from the side limiting groove 72, and the outer wall of the stabilizing slider 711 can be engaged in the side hole 510 of the adjustment plate.

[0049] Simultaneously, when the top block drive column 75 moves upward, a suction force is generated at its bottom, drawing the gas stored inside the side locking tube 712 into the drive column sleeve 74. The resulting negative pressure causes the locking pin 714 to move towards one end of the drive column sleeve 74, causing the pin linkage rod 715, which is fixedly connected to the outer wall of the locking pin 714, to retract into the side locking tube 712. This, in turn, causes the ball bearing 713, which is movably sleeved on the outer wall of the pin linkage rod 715, to retract into the side limiting groove 72, no longer contacting the central guide rod 58. In addition, after the adjustment plate side hole 510 and the stabilizing slider 711 form a locking connection, they can provide a stable force during the upward extension of the central guide rod 58, preventing the central guide rod 58 from shaking when it moves upward, and preventing the adjustment plate 56 from unevenly squeezing the adjustment spring 54, thus shortening the service life of the adjustment spring 54.

[0050] When the adjusting spring 54 resets, its pressure on the bottom top block 71 decreases. The spring rod 77, which is movably sleeved on the outer wall of the reset spring rod 76, will also reset, driving the top block drive column 75 to move downward. When the top block drive column 75 moves downward, it will squeeze the gas filled at its bottom, which will be transported to the inside of the side locking tube 712 and continuously stored. This will cause the locking pin 714 to extend outward from the inside of the side locking tube 712. At the same time, the ball bearing 713, which is movably installed inside the pin linkage rod 715 fixedly connected to the locking pin 714, will extend out from the inside of the side guide groove 73 and rub against the outer wall of the center guide rod 58, thereby reducing the friction force. This allows the pressure regulating plate 59 and other components to quickly reset and fit against the top of the top pressing plate 51, forming a seal and preventing continuous gas leakage.

[0051] Working principle: When using,

[0052] Step 1: Closing the device and sealing the gas

[0053] The aluminum can 6 is placed on top of the auxiliary support column 33, which is movably connected inside the support adjustment groove 31. After the pneumatic cylinder 2 is activated, the pneumatic cylinder 2 pushes the top pressing plate 51 downward, causing the main support block 32 to retract into the main body 1 of the device. This, in turn, drives the auxiliary support column 33 in the support adjustment groove 31 to move downward, so that the aluminum can 6 retracts into the support adjustment groove 31 along with the auxiliary support column 33. At this time, the top pressing plate 51 covers the top of the support adjustment groove 31 to form a seal, and the side pressing tube 52 at the bottom of the top pressing plate 51 extends into the aluminum can 6. Air is stored inside both the support adjustment groove 31 and the aluminum can 6, providing a closed environment for subsequent testing.

[0054] Step 2: Air tightness test and abnormal exhaust

[0055] The side pressure tube 52 compresses the gas inside the can 6, increasing the pressure. If there is a gap in the can 6, the gas will escape through the gap, causing the gas density in the support adjustment groove 31 to increase. The gas is then transported to the transparent cylinder 42 via the air pressure detection tube 41. The air tightness is detected by the bubbles generated by the detection liquid 410 in the transparent cylinder 42. At the same time, the sealing detection chamber 8 in the auxiliary support column 33 is triggered by the linkage rod 37 to activate the clamping mechanism. The linkage clamping block 811 clamps and calibrates the can 6 to prevent the side pressure tube 52 from shifting and compressing the outer wall of the can 6. During the test, the relevant components of the air pressure detection component 4 are linked to ensure that the gas is smoothly transported to the transparent cylinder 42. After the test is completed, all components are reset, making it easy to remove the can 6.

[0056] Step 3: Overpressure protection and component reset

[0057] When the internal gas pressure of the can 6 exceeds 0.2 MPa, the gas enters the side pressure tube 52 through the round hole of the bottom squeeze plug, lifting the pressure regulating plate 59 to release pressure and prevent deformation of the can 6. When the pressure regulating plate 59 is lifted, it drives the central guide rod 58 to move the adjusting plate 56, compressing the adjusting spring 54 to deform. When the pressure is below 0.2 MPa, the adjusting spring 54 returns to its original position, driving the adjusting plate 56, the central guide rod 58, and the pressure regulating plate 59 back to their original position. The pressure regulating plate 59 adheres to the top of the top pressing plate 51 to form a seal. During this process, the adjusting spring 54 compresses the bottom top block 71, triggering a series of linkages within the buffer bottom groove 7. The stabilizing slider 711 engages with the adjusting plate side hole 510 to stabilize the central guide rod 58, preventing the adjusting spring 54 from having its lifespan shortened due to uneven compression. After pressure release, the components inside the buffer bottom groove 7 return to their original positions, and the ball bearing 713 rubs against the central guide rod 58 to reduce resistance, ensuring rapid sealing of the pressure regulating plate 59 and preventing continuous gas leakage.

[0058] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0059] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A device for testing the air tightness of an aluminum can, comprising a device body (1), a pressure cylinder (2), and an aluminum can (6), wherein the pressure cylinder (2) is fixedly installed on the top of the device body (1), and the aluminum can (6) is placed inside the device body (1), characterized in that: The device body (1) is provided with a bottom support adjustment component (3) inside, and a pneumatic pressure detection component (4) is fixedly installed on the side of the device body (1). The bottom of the pneumatic cylinder (2) is movably connected to a top pressing component (5). The bottom support adjustment assembly (3) includes a support adjustment groove (31), a main support block (32) and an auxiliary support column (33). The main body (1) of the device has two symmetrical support adjustment grooves (31). The main support block (32) is movably connected between the two symmetrical support adjustment grooves (31). The auxiliary support column (33) is movably connected inside the support adjustment groove (31). The air pressure detection assembly (4) includes an air pressure detection tube (41) and a transparent tube (42) inside. The air pressure detection tube (41) is fixedly installed on the side of the main body (1) of the device, and the transparent tube (42) is fixedly installed on the top of the air pressure detection tube (41). The top pressing assembly (5) includes a top pressing plate (51) and side pressing pipes (52). The bottom of the pneumatic cylinder (2) passes through the top of the main body (1) and is movably connected to the top pressing plate (51). Two symmetrical side pressing pipes (52) are fixedly installed at the bottom of the top pressing plate (51). The bottom middle section of the top pressing plate (51) is fixedly connected to the top of the main support block (32). The top pressing assembly (5) also includes a pressing buffer block (53), an adjusting spring (54), a side adjusting plate (55), an adjusting plate (56), a drive connecting column (57), a central guide rod (58), and a pressure adjusting plate (59). The pressing buffer block (53) is fixedly installed inside the side pressing tube (52). The adjusting spring (54) is attached to the bottom of the pressing buffer block (53). The side adjusting plate (55) is fixedly connected to both ends of the adjusting spring (54). The adjusting plate (56) is attached to the end of the side adjusting plate (55) away from the pressing buffer block (53). The top of the top pressing plate (51) is fixedly connected to a drive connecting column (57). The top of the drive connecting column (57) is movably connected to the inside of the pneumatic cylinder (2). The inside of the adjusting plate (56) is fixedly installed with a central guide rod (58). The end of the central guide rod (58) away from the adjusting plate (56) is fixedly connected to a pressure adjusting plate (59). Both ends of the pressure adjusting plate (59) are provided with adjusting plate side holes (510). The adjusting spring (54), the pressing buffer block (53) and the side adjusting plate (55) are all movably connected to the outer wall of the central guide rod (58).

2. The device for detecting the airtightness of an aluminum can according to claim 1, characterized in that: The bottom of the main support block (32) is movably fitted with an intermediate adjustment block (35), the bottom of the intermediate adjustment block (35) is movably fitted with a bottom support seat (36), and the top two sides of the intermediate adjustment block (35) are fixedly connected with linkage rods (37). The end of the linkage rod (37) away from the intermediate adjustment block (35) extends into the interior of the support adjustment groove (31) and is fixedly connected to the bottom of the auxiliary support column (33).

3. The device for detecting the airtightness of an aluminum can according to claim 2, characterized in that: A limiting plate (38) is fixedly installed at the bottom of the main support block (32). The outer wall of the limiting plate (38) is movably connected to the inside of the intermediate adjustment block (35). A spring limiting sleeve rod (39) is fixedly installed at the bottom of the inner cavity of the intermediate adjustment block (35). A buffer spring (310) is movably connected to the outer wall of the spring limiting sleeve rod (39). The bottom of the intermediate adjustment block (35) is also fixedly installed with a limiting plate (38) and movably connected to the top of the bottom support seat (36).

4. The device for detecting the airtightness of an aluminum can according to claim 1, characterized in that: A sealing detection chamber (8) is fixedly installed inside the support adjustment groove (31). A chamber side slit (81) is opened between the sealing detection chamber (8) and the support adjustment groove (31). A vent hole (82) is opened through the bottom of both the sealing detection chamber (8) and the support adjustment groove (31). Movable sealing grooves (83) are opened on both sides of the bottom of the inner cavity of the sealing detection chamber (8). A connecting push rod (84) is movably sleeved inside the movable sealing groove (83). A sealing piston (85) is fixedly installed at the bottom of the connecting push rod (84). A side slit is movably sleeved at the bottom of the sealing piston (85). A sealing cylinder (86) is provided with a sealing adjustment tube (87) fixedly installed on one side of its bottom. An adjustment plug (88) is movably sleeved in the top inner cavity of the sealing adjustment tube (87). An extension rod (89) is fixedly connected to the outer wall of the adjustment plug (88). A protruding adjustment seat side groove (810) is fixedly connected to the top of the sealing adjustment tube (87). The adjustment seat side groove (810) is located at both ends of the sealing detection cavity (8). The extension rod (89) extends into the interior of the adjustment seat side groove (810) and is fixedly connected to a linkage clamping block (811) at one end away from the sealing adjustment tube (87).

5. The device for detecting the airtightness of an aluminum can according to claim 4, characterized in that: The end of the air pressure detection tube (41) away from the transparent cylinder (42) passes through the sealed detection cavity (8) and the auxiliary support column (33), and the end closer to the sealed detection cavity (8) is fitted with a piston linkage block (48). A limit plate (43) is fixedly installed inside the air pressure detection tube (41). A sensing rod (47) is movably sleeved inside the limit plate (43). One end of the sensing rod (47) is fixedly connected to the piston linkage block (48), and the end of the sensing rod (47) away from the piston linkage block (48) is fixedly connected to a transmission rod (44). The transmission rod (44) is movably sleeved with a transmission spring (45). The end of the transmission rod (44) away from the sensing rod (47) is fixedly connected to a pressing contact (46). The bottom of the piston linkage block (48) is fixedly connected to a contact linkage rod (49). The bottom of the contact linkage rod (49) and the top of the linkage clamp block (811) are fixedly connected. The inside of the transparent cylinder (42) is filled with detection liquid (410). The outlet of the air pressure detection tube (41) away from the auxiliary support column (33) is located inside the limiting horizontal plate (43).

6. The device for detecting the airtightness of an aluminum can according to claim 1, characterized in that: The interior of the compression buffer block (53) includes a buffer bottom groove (7), a bottom top block (71), a side limiting groove (72), and a side guide groove (73). The bottom of the compression buffer block (53) is provided with a buffer bottom groove (7). The bottom top block (71) is movably sleeved on both sides of the buffer bottom groove (7). The interior of the compression buffer block (53) is provided with symmetrical side limiting grooves (72) and side guide grooves (73) on both sides.

7. The device for detecting the airtightness of an aluminum can according to claim 6, characterized in that: A top block drive column (75) is fixedly installed on the top of the bottom block (71). A drive column sleeve (74) is movably sleeved on the outer wall of the top block drive column (75). The top of the drive column sleeve (74) is fixedly connected to the inside of the pressing buffer block (53). A reset spring rod (76) is fixedly installed on the top of the inner cavity of the drive column sleeve (74). A spring rod (77) is movably sleeved on the outer wall of the reset spring rod (76). The bottom of the spring rod (77) and the top of the top block drive column (75) fit together. The inside of the top block drive column (75) and the outer wall of the reset spring rod (76) are movably sleeved. A side adjustment is fixedly installed on one side of the top of the drive column sleeve (74). The side adjustment tube (78) is fitted with an adjustment rod (79) inside. The outer wall of the adjustment rod (79) is fixedly connected to a drive block (710). The end of the drive block (710) away from the adjustment rod (79) is fixedly connected to a stabilizing slider (711). The bottom side of the drive column sleeve (74) is fixedly installed with a side locking tube (712). The side locking tube (712) is fitted with a locking pin (714) inside. The outer wall of the locking pin (714) is fixedly connected to a pin linkage rod (715). The end of the pin linkage rod (715) away from the locking pin (714) is movably connected to a ball bearing (713).

8. The device for detecting the airtightness of an aluminum can according to claim 1, characterized in that: When the pressure at the bottom of the pressure regulating plate (59) is greater than 0.2 MPa, it will be lifted up; when the pressure at the bottom of the pressure regulating plate (59) is less than 0.2 MPa, it will shrink and adhere to the top of the top pressing plate (51).

9. The device for detecting the airtightness of an aluminum can according to claim 7, characterized in that: The top and bottom of the top block drive column (75) are filled with air, and when the top block drive column (75) moves upward, a suction force is generated at the bottom, and when the top block drive column (75) moves downward, a suction force is generated at the top.

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