A method for detecting air tightness of thermos cups

Abstract

The present invention relates to the technical field of air tightness detection, and discloses an air tightness detection method for thermos cup production, which mainly includes three steps: water immersion air tightness judgment, qualified rate judgment, and repair difficulty judgment. After the thermos cup is immersed in water to observe whether bubbles are generated to judge the air tightness, the present invention marks the thermos cups with or without air tightness problems respectively, thereby obtaining the number of unqualified thermos cups with air tightness problems, and taking the ratio of the number of unqualified products to the total number of orders as the unqualified rate in this order, and comparing this unqualified rate with the unqualified rate threshold. When the unqualified rate is less than the unqualified rate threshold, it means that the number of unqualified products is relatively small. For the sake of production efficiency, priority is given to whether these unqualified products can be repaired, because if the production line is reopened to produce the missing number corresponding to the unqualified products, more production costs will be increased.

Description

Technical Field

[0001] The invention relates to the technical field of air tightness detection, in particular to an air tightness detection method for producing thermos cups. Background Art

[0002] The main materials of thermos cups include stainless steel, plastic and silicone. Stainless steel is usually used for the cup body and liner. Plastic and silicone are used for the cup lid and seal. The cup body and liner need to be assembled by welding or other connection methods. Vacuum insulation is usually achieved by extracting the air between the liner and the outer shell to form a vacuum layer. After assembly, each thermos cup needs to undergo strict quality inspection. This includes sealing tests, thermal insulation performance tests, and appearance inspections to ensure that the product meets design standards and quality requirements.

[0003] Among them, when conducting a sealing test, the commonly used method in the prior art is to tighten the thermos cup and then immerse it in water to observe whether there are bubbles to determine whether there is a leak. Although this detection method can determine the airtightness of the thermos cup, it does not provide good feedback to manufacturers. How to deal with leaking thermos cups is a problem. Because for manufacturers, on the basis of ensuring quality, avoiding additional cost consumption as much as possible is positive feedback. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide an airtightness detection method for the production of thermos cups, so as to determine how to compensate for the leakage of the thermos cup at the lowest cost after it is found that the thermos cup is leaking.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: A method for detecting air tightness of thermos cups for production, comprising the following steps: Step 1, obtaining the total number of thermos cups produced in a single order, tightening all the thermos cups, clamping them with a clamp, immersing them in water in a vertical downward direction, setting a specified immersion time, observing whether bubbles are generated in the water area within a preset range of the thermos cup within the specified immersion time, and marking the thermos cup differently according to whether bubbles are generated. If bubbles are generated, it is marked as a defective product, and if no bubbles are generated, it is marked as a qualified product; Step 2, obtaining the total number of defective products, and taking the ratio of the defective product to the total number of thermos cups as the defective rate, setting a defective rate threshold, comparing the defective rate with the defective rate threshold, making a selection according to the comparison result, if the defective rate does not exceed the defective rate threshold, executing step 3, and if the defective rate exceeds the defective rate threshold, not executing step 3; Step 3, when the defective rate does not exceed the defective rate threshold, grading the difficulty of repairing all defective products, and judging whether to repair the defective products according to the number of defective products at each level.

[0006] In some embodiments, the difficulty of repairing all defective products is graded according to the bubbling frequency, wherein the bubbling frequency is the frequency of bubbles generated in a water area within a preset range when the defective product is immersed in water for a specified immersion time.

[0007] In some embodiments, after obtaining the bubbling frequency of defective products, two frequency thresholds are set according to actual conditions, namely a first frequency threshold and a second frequency threshold, wherein the second frequency threshold is greater than the first frequency threshold, and the difficulty level of repairing the defective products is determined based on the relationship between the bubbling frequency of the defective products and the first frequency threshold and the second frequency threshold.

[0008] In some embodiments, defective products whose bubbling frequency does not exceed the first frequency threshold are classified as first-level defective products, defective products whose bubbling frequency falls between the first frequency threshold and the second frequency threshold are classified as second-level defective products, and defective products whose bubbling frequency exceeds the second frequency threshold are classified as third-level defective products. Whether to repair the defective products is determined based on the number of defective products at each level.

[0009] In some embodiments, if the total number of first-level defective products and second-level defective products is greater than the number of third-level defective products, all defective products are repaired; if the total number of first-level defective products and second-level defective products is less than or equal to the number of third-level defective products, the third-level defective products are re-judged.

[0010] In some embodiments, the method for re-judging the third-level defective products is: divide the connection between the lid and the cup body of the thermos cup into several areas, set a leakage area number threshold, obtain the leakage area number of each third-level defective product, compare the leakage area number of each third-level defective product with the leakage area number threshold separately, obtain the number TL1 of defective products whose leakage area number is less than the leakage area number threshold among all third-level defective products, and the number TL2 of defective products whose leakage area number is greater than or equal to the leakage area number threshold among all third-level defective products, and then judge whether to repair the defective products according to the number of defective products at each level.

[0011] In some embodiments, if the total number of first-level defective products plus second-level defective products plus TL1 is greater than the number of TL2, all defective products are repaired; if the total number of first-level defective products plus second-level defective products plus TL1 is less than or equal to the number of TL2, no defective products are repaired.

[0012] In some embodiments, when the total number of first-level defective products and second-level defective products is less than or equal to the number of third-level defective products, when the third-level defective products are re-judged, the threshold value of the number of leakage areas should be less than the number of areas into which the connection between the cup body and the cup lid is evenly divided.

[0013] In some embodiments, when a clamp is used to clamp a thermos cup and immerse it in water, a certain distance should be provided between the thermos cups on the clamp to prevent bubbles from stacking up when bubbles are generated in water areas within a preset range of adjacent thermos cups.

[0014] The present invention also provides the following technical solutions:

[0015] The present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement the above-mentioned airtightness detection method for thermos cup production.

[0016] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0017] Firstly, after immersing the thermos cup in water to observe whether bubbles are generated and judge the air tightness, the present invention marks the thermos cups with and without air tightness problems, thereby obtaining the number of defective thermos cups with air tightness problems, and taking the ratio of the number of defective products to the total number of orders as the unqualified rate in this order, and comparing this unqualified rate with the unqualified rate threshold. When the unqualified rate is less than the unqualified rate threshold, it means that the number of unqualified products is relatively small. For the sake of production efficiency, priority is given to whether these unqualified products can be repaired, because if the production line is reopened to produce the missing number corresponding to the defective products, more production costs will be increased.

[0018] Secondly, in the present invention, when it is found that the number of defective products is relatively small, the bubbling frequency of the defective products is obtained, and the defective products are divided into multiple levels according to the frequency threshold range within which the bubbling frequency of the defective products falls. The defective products with higher bubbling frequency also represent a greater degree of leakage, and the greater the degree of leakage also represents a greater difficulty in repair. Therefore, the higher the level, the higher the difficulty in repair. In this way, based on the comparison between the number of defective products with relatively easy repair difficulty and the number of defective products with high repair difficulty, it can be concluded whether the number of defective products with relatively easy repair difficulty is large or the number of defective products with high repair difficulty is large. When it is found that the number of defective products with relatively easy repair difficulty is large, the defective products can be repaired.

[0019] Thirdly, in the present invention, when it is found that there are a large number of defective products with high repair difficulty, a second judgment is made on the defective products of the level with high repair difficulty. During the second judgment, the connection between the lid and the body of the thermos cup is divided into several areas, and a threshold value for the number of leakage areas is set. After the number of leakage areas of the defective products is obtained, it is compared with the threshold value for the number of leakage areas, and the defective products of this level with relatively fewer leakage areas are regarded as the defective products of the previous level with relatively simple repair, because the small number of leakage areas reduces the difficulty of repair caused by the large degree of leakage to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the steps of the present invention;

[0021] Figure 2 It is a logical sequence diagram of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0024] The present invention provides a method for detecting air tightness of a thermos cup for production, such as Figure 1 and Figure 2 As shown, the following steps are included:

[0025] The first step is to obtain the total number of thermos cups in a single order after production is completed. After tightening the thermos cups, use a clamp to clamp all the thermos cups in batches and immerse them in the pool vertically downward. The clamped thermos cups should be spaced a certain distance apart to prevent the bubbles generated in the pool from overlapping and affecting the judgment when there is a leak. Set a specified immersion time and observe whether the water area near the thermos cup is bubbling during the specified immersion time. If no bubbles are generated, it means that the thermos cup has no airtightness problem and the product is qualified and marked as a qualified product. If bubbles are generated, it means that the thermos cup has an airtightness problem and the product is unqualified and the thermos cup is marked as an unqualified product.

[0026] In the second step, for unqualified products, manufacturers cannot send them to customers for use, which is equivalent to a certain number of qualified products missing in the order. At this time, in order to complete the order, either restart the production line to make up the missing quantity, or consider whether the unqualified products can be repaired. For cost and production efficiency considerations, priority is given to whether unqualified products can be repaired. Under this premise, we must first determine the proportion of unqualified products in the total order quantity. If the number of unqualified products is too large, the repair consumption is large and the repair takes a lot of time, so there is no need to repair. If the number of unqualified products is relatively small, consider subsequent repairs. Therefore, after the air tightness test of the thermos cup, the number of all unqualified products in the thermos cup is obtained. The ratio of the number of unqualified products to the total number of orders is the unqualified rate. The unqualified rate threshold is set, and the unqualified rate is compared with the unqualified rate threshold, and a choice is made based on the comparison result. If the unqualified rate does not exceed the unqualified rate threshold, the third step is executed. If the unqualified rate exceeds the unqualified rate threshold, the unqualified product is not considered for repair.

[0027] The third step is that when the number of defective products is relatively small relative to the total order quantity, the difficulty of repairing these defective products should also be considered. If the overall repair difficulty of these defective products is relatively large, there is no need to make too much consumption to repair the defective products. If the overall repair difficulty of these defective products is relatively small, these defective products can be repaired. The specific operation is: while the thermos cup is immersed in the pool, the frequency of bubbles generated in the water area within the preset range of the thermos cup is measured in real time by the sensor, that is, the bubbling frequency, and the defective products are divided into different levels according to the bubbling frequency of the defective thermos cup. The two thresholds of the bubbling frequency are set to be the first frequency threshold and the second frequency threshold, respectively. The second frequency threshold is greater than the first frequency threshold. The defective products whose bubbling frequency does not exceed the first frequency threshold are classified as first-level defective products OL, the defective products whose bubbling frequency falls between the first frequency threshold and the second frequency threshold are classified as second-level defective products SL, and the defective products whose bubbling frequency exceeds the second frequency threshold are classified as third-level defective products. Whether to repair the defective products is determined according to the number of defective products at each level. If the total number of level 1 and level 2 defective products is greater than the number of level 3 defective products, all defective products will be repaired. If the total number of level 1 and level 2 defective products is less than or equal to the number of level 3 defective products, a second judgment will be made on the level 3 defective products. Because the bubbling frequency is equivalent to the speed of leakage, and the speed of leakage represents the degree of leakage. The lower the degree of leakage, the easier it is to repair. This corresponds to the level of defective products. The level 1 defective products have a lower difficulty to repair, the level 2 defective products have a medium difficulty to repair, and the level 3 defective products have a higher difficulty to repair. In this case, whether to repair or not depends on the number of defective products. When the total number of level 1 defective products and level 2 defective products is greater than the number of level 3 defective products, it means that there are fewer defective products with a higher difficulty to repair, and more defective products with a lower difficulty to repair. At this time, it is relatively easy to repair all defective products. When the total number of first-level and second-level defective products is less than or equal to the number of third-level defective products, it means that there are more defective products with higher repair difficulty and fewer defective products with lower repair difficulty. At this time, it is relatively troublesome to repair all defective products. However, at this time, it also depends on the leakage area of ​​the third-level defective products. If the leakage area is not large, it is relatively easy to repair. Because if the leakage area of ​​the third-level defective products is small, it is equivalent to reducing the difficulty of repair, which makes up for part of the problem of higher repair difficulty caused by the larger leakage.The specific method of secondary judgment is: divide the connection between the lid and the body of the thermos cup into several areas, set the threshold of the number of leakage areas to m, obtain the number of leakage areas of each level 3 defective product through the sensor, compare the number of leakage areas of each level 3 defective product with m, and then obtain the number of level 3 defective products with less than m leakage areas TL1 and the number of level 3 defective products with greater than or equal to m leakage areas TL2, compare the number of TL1+OL+SL with TL2, and get the final response based on the comparison result. If the number of TL1+OL+SL>TL2, all defective products are repaired. If the number of TL1+OL+SL≤TL2, the defective products are not repaired, and the corresponding missing quantity of all defective products is re-produced. Regarding TL1 and TL2 mentioned above, TL1 represents the number of level 3 defective products whose leakage area is smaller than the threshold value among the level 3 defective products. These level 3 defective products can be regarded as level 2 defective products at this time, while TL2 represents the number of level 3 defective products whose leakage area is greater than or equal to the threshold value among the level 3 defective products. These level 3 defective products are regarded as new level 3 defective products. By comparing the sum of the number of level 1 defective products and all level 2 defective products at this time with the number of new level 3 defective products, it can be determined whether the number of defective products that are easy to repair is in the majority or minority.

[0028] For example, if a total of 100 thermos cups are produced, and the clamp can grab 20 cups at a time, the thermos cups in this order are grabbed in 5 batches and immersed in the pool. The specified immersion time is set to 1 minute. If bubbles appear in the water area near the thermos cup within 1 minute, the thermos cup is marked as a defective product. The thermos cups without bubbles in the water area within the preset range are marked as qualified products. Record the number of all defective products, assuming 10, and set the defect rate threshold to 10%. For 100 thermos cups, the defect rate is 10%, which does not exceed the defect rate threshold. At this time, priority is given to whether these 10 defective thermos cups can be repaired. This selection is made by roughly judging the difficulty of repairing these defective thermos cups. Assuming that the first frequency threshold is 50 / min and the second frequency threshold is 100 / min, the frequency of 10 defective thermos cups measured in real time by the sensor is shown in the following table:

[0029] Defective product serial number 1 2 3 4 5 6 7 8 9 10 Bubble frequency (pieces / min) 52 102 34 111 109 41 107 112 86 124

[0030] From the above table, we can see that among the 10 defective products, there are 2 with a bubbling frequency lower than the first frequency threshold, 2 with a bubbling frequency between the first and second frequency thresholds, and 6 with a bubbling frequency exceeding the second frequency threshold. Therefore, the number of first-level defective products OL is 2, the number of second-level defective products SL is 2, and the number of third-level defective products is 6. The number of first-level defective products plus second-level defective products is less than the number of third-level defective products. At this time, the 6 third-level defective products are judged again. Assuming that the leakage area number threshold m is 3, the number of leakage areas of the 6 third-level defective products is shown in the following table:

[0031] Serial number of third-level defective products 1 2 3 4 5 6 Number of leak areas 3 1 4 3 2 5

[0032] From the table above, we can see that among the 6 third-level defective products, there are 2 with leakage area less than 3, and 4 with leakage area greater than or equal to 3, that is, TL1=2, TL2=4. TL1 is taken as the new second-level defective product, and TL2 is taken as the new third-level defective product, and then the quantity is compared again. Then the number of OLs + the number of SLs + TL1=2+2+2=6>TL2=4. Therefore, according to the final comparison result, all defective products are considered to be repaired.

[0033] In the above process, the third-level defective products are all defective products that exceed the second frequency threshold among the defective products. The degree to which these defective products exceed the second frequency threshold varies. However, no matter how much they exceed the second frequency threshold, they are all regarded as third-level defective products. Then, when the total number of first-level defective products and second-level defective products is less than or equal to the third-level defective products, it is determined whether to treat some of the third-level defective products as second-level defective products based on the number of leakage areas. The third-level defective products that are regarded as second-level defective products are those third-level defective products whose number of leakage areas is less than the threshold. For these third-level defective products, since the leakage area is composed of the lid and the body of the thermos cup, even if the number of leakage areas is small, the overlap of the leakage areas of the body and the lid may cause the number of leakage areas to be large in essence. In order to avoid this problem as much as possible, the threshold of the number of leakage areas should be smaller than the number of areas evenly divided by the connection. For example, assuming that the connection is evenly divided into 10 areas, the threshold should be below 3 as much as possible. The smaller the threshold, when there are repeated leakage areas on the body and the lid, the total number of leakage areas will be relatively small. When the threshold is 3, only the leakage areas with 1 and 2 are regarded as second-level defective products. Even if there are overlapping leakage areas, the total number of leakage areas is 2 and 4. If the threshold is larger, when the overlap problem occurs, the total number of leakage areas will be larger. For example, if the threshold is 7, the leakage area with 6 is also regarded as a second-level defective product. There are 6 leakage areas on the body and 6 leakage areas on the lid overlapping, which is a total of 12 leakage areas.

[0034] In addition, the present invention also provides a computer-readable storage medium, which stores a computer program. The computer program is executed by a processor to implement the above-mentioned airtightness detection method for thermos cup production.

[0035] In general, during the air tightness test of the present invention, the number of defective products with air tightness problems is first determined. When it is determined that the number of defective products is relatively small, the bubbling frequency of the defective products is obtained, and the defective products are divided into multiple levels according to the frequency threshold range within which the bubbling frequency of the defective products falls. The higher the bubbling frequency of the defective products, the greater the degree of leakage, and the greater the degree of leakage, the greater the difficulty of repair. Therefore, the higher the level, the higher the difficulty of repair. In this way, based on the comparison between the number of defective products with relatively easy repair difficulty and the number of defective products with high repair difficulty, it can be determined whether the number of defective products with relatively easy repair difficulty is large, or the number of defective products with high repair difficulty is large. When it is found that the number of defective products with relatively easy repair difficulty is large, the defective products can be repaired. When it is found that there are a large number of defective products that are difficult to repair, a second judgment is made on the defective products of that level that are difficult to repair. During the second judgment, the connection between the lid and the body of the thermos cup is divided into several areas, and a threshold for the number of leakage areas is set. After the number of leakage areas of the defective products is obtained, it is compared with the threshold for the number of leakage areas, and the defective products of this level with relatively fewer leakage areas are regarded as the defective products of the previous level that are relatively simple to repair, because the small number of leakage areas reduces the difficulty of repair caused by the large degree of leakage to a certain extent.

[0036] In the embodiments disclosed in the present invention, the processes described above with reference to the flowchart can be implemented as a computer software program. The embodiments disclosed in the present invention include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part, and / or installed from a removable medium. When the computer program is executed by the central processing unit, the above functions defined in the method of the present application are executed. It should be noted that the computer-readable medium mentioned above in the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media can include, but are not limited to: an electrical connection with one or more wire segments, a portable computer disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical fiber, a portable compact disk read-only memory, an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, apparatus, or device. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in combination with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium may be transmitted using any suitable medium, including but not limited to: wireless segments, wire segments, optical cables, RF, etc., or any suitable combination of the above.

[0037] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the boxes can also occur in a different order than the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0038] Those skilled in the art should understand that the above description is only a specific implementation mode of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A method for detecting air tightness of a vacuum flask for production, characterized in that: The following steps are involved: Step 1: Obtain the total number of thermos cups produced for a single order, tighten all the thermos cups, clamp them with a clamp, immerse them in water in a vertical downward direction, set a specified immersion time, and observe whether bubbles are generated in the water area within a preset range of the thermos cup within the specified immersion time. Mark the thermos cup differently according to whether bubbles are generated. If bubbles are generated, mark it as a defective product, and if no bubbles are generated, mark it as a qualified product. Step 2: Obtain the total number of defective products, and use the ratio of the total number of defective products to the total number of thermos cups as the defective rate, set the defective rate threshold, and compare the defective rate with the defective rate threshold. Make a choice based on the comparison result. If the defective rate does not exceed the defective rate threshold, execute step 3; if the defective rate exceeds the defective rate threshold, do not execute step 3. Step 3: When the failure rate does not exceed the failure rate threshold, all the failure products are graded according to the difficulty of repair, and whether to repair the failure products is determined according to the number of failure products at each level; The difficulty of repairing all defective products is graded according to the bubbling frequency, wherein the bubbling frequency is the frequency of bubbles generated in the water area within a preset range when the defective product is immersed in water within a specified immersion time; After obtaining the bubbling frequency of the defective product, two frequency thresholds are set according to the actual situation, namely the first frequency threshold and the second frequency threshold, wherein the second frequency threshold is greater than the first frequency threshold, and the repair difficulty level of the defective product is determined according to the relationship between the bubbling frequency of the defective product and the first frequency threshold and the second frequency threshold; Defective products whose bubbling frequency does not exceed the first frequency threshold are classified as first-level defective products, defective products whose bubbling frequency falls between the first frequency threshold and the second frequency threshold are classified as second-level defective products, and defective products whose bubbling frequency exceeds the second frequency threshold are classified as third-level defective products. Whether to repair the defective products is determined according to the number of defective products at each level; If the total number of first-level defective products and second-level defective products is greater than the number of third-level defective products, all defective products will be repaired; if the total number of first-level defective products and second-level defective products is less than or equal to the number of third-level defective products, the third-level defective products will be re-judged; The method for re-judging the third-level defective products is: divide the connection between the lid and the cup body of the thermos cup into several areas, set a leakage area number threshold, obtain the leakage area number of each third-level defective product, compare the leakage area number of each third-level defective product with the leakage area number threshold separately, obtain the number TL1 of defective products whose leakage area number is less than the leakage area number threshold among all third-level defective products, and the number TL2 of defective products whose leakage area number is greater than or equal to the leakage area number threshold among all third-level defective products, and then judge whether to repair the defective products according to the number of defective products at each level.

2. The method for detecting air tightness of a vacuum flask according to claim 1, characterized in that: If the total number of first-level defective products plus second-level defective products plus TL1 is greater than the number of TL2, all defective products will be repaired. If the total number of first-level defective products plus second-level defective products plus TL1 is less than or equal to the number of TL2, no defective products will be repaired.

3. The method for detecting air tightness of a vacuum flask according to claim 2, characterized in that: When the total number of first-level defective products and second-level defective products is less than or equal to the number of third-level defective products, when the third-level defective products are re-judged, the threshold value of the number of leakage areas should be less than the number of areas divided by the connection between the cup body and the cup lid.

4. The method for detecting air tightness of a vacuum flask according to claim 1, characterized in that: When using a clamp to hold a thermos cup and immerse it in water, there should be a certain distance between the thermos cups on the clamp to prevent the bubbles from stacking up when bubbles are generated in the water area within the preset range of adjacent thermos cups.

5. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement the airtightness detection method for thermos cup production as described in any one of claims 1 to 4.

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