WO2020252788A1 - Dispositif, système et procédé de détection d'étanchéité à l'air - Google Patents

Dispositif, système et procédé de détection d'étanchéité à l'air Download PDF

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Publication number
WO2020252788A1
WO2020252788A1 PCT/CN2019/092404 CN2019092404W WO2020252788A1 WO 2020252788 A1 WO2020252788 A1 WO 2020252788A1 CN 2019092404 W CN2019092404 W CN 2019092404W WO 2020252788 A1 WO2020252788 A1 WO 2020252788A1
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WO
WIPO (PCT)
Prior art keywords
air
detection
cavity
tightness
box
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Application number
PCT/CN2019/092404
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English (en)
Chinese (zh)
Inventor
张顺
钟志勇
Original Assignee
深圳市大疆创新科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 深圳市大疆创新科技有限公司 filed Critical 深圳市大疆创新科技有限公司
Priority to CN201980012100.7A priority Critical patent/CN111699372B/zh
Priority to PCT/CN2019/092404 priority patent/WO2020252788A1/fr
Publication of WO2020252788A1 publication Critical patent/WO2020252788A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/12—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water

Definitions

  • the embodiment of the present invention belongs to the field of testing technology, and in particular relates to an air tightness detection device, a detection system and an air tightness detection method.
  • the airtightness test of existing electronic products generally adopts the method of soaking in water. This method of testing requires a large volume of the test equipment and relatively high equipment cost. This test method has low test efficiency and is in the process of soaking. It is easy to cause damage to electronic products, and cannot meet the needs of mass product testing, and cannot be compatible with the testing of products of different specifications.
  • the embodiment of the present invention provides an air tightness testing device to solve the problem that the testing method used in the prior art has a large volume, low testing efficiency, and easily damages the product under test, which cannot satisfy The testing requirements of batch products and the problems of incompatibility with the testing of products of different specifications; in addition, the embodiment of the present invention also provides an air tightness detection system and an air tightness detection method.
  • An air tightness testing equipment including:
  • the detection box can form a closed cavity under the action of the drive assembly, the cavity is used to contain at least one product to be tested, and the control box is provided with an inlet and outlet communicating with the cavity.
  • the image acquisition device is used to collect images in the cavity in real time and perform image analysis when performing air tightness testing, so as to output image analysis results to determine the air tightness of the tested product.
  • An air-tightness detection system includes a film-coating device and the above-mentioned air-tightness detection equipment.
  • the film-coating device is used to form a detection film on the surface of the tested product before the detection. When qualified, the detection film will be deformed during the detection process.
  • An air tightness detection method applied to the above air tightness detection system, the method comprising:
  • the cavity is pressure-maintained according to the preset pressure-holding time, and images of the tested product are collected in real time;
  • the air-tightness detection equipment, detection system, and air-tightness detection method provided by the embodiments of the present application collect images of the tested product in an air-tightness test in a closed environment, and analyze the images to determine whether the tested product meets the requirements Air-tightness requirements, this kind of test equipment is small in size, test efficiency is improved, and will not cause damage to the tested product, can meet the needs of batch product testing, and can be compatible with the testing of products of different specifications.
  • FIG. 1 is a schematic diagram of the overall structure of an air tightness detection device provided by an embodiment of the present invention
  • Figure 2 is an exploded view of the air tightness detection equipment provided by an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of the connection between the driving assembly and the detection box provided by the embodiment of the present invention.
  • Figure 4 is a schematic diagram of a control box provided by an embodiment of the present invention.
  • FIG. 5 is a flowchart of a method for detecting air tightness according to an embodiment of the present invention.
  • control box 10 roof 101 Bottom plate 102 Side panel 103a, 103b, 103c, 103d Inlet and outlet components 11
  • Control panel 12 start up button 121a, 121b reset button 122 emergency button 123 Display device 13
  • Display screen 131 Screen cover 132
  • Loudspeaker 14 Lock fastener 15a, 15b Lifting pieces 16a, 16b Detection box 20
  • Seat body twenty one Cover twenty two Seals twenty three Drive components 30
  • a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes unlisted steps or units, or optionally also includes Other steps or units inherent to these processes, methods, products or equipment.
  • the embodiment of the present invention provides an air tightness detection device, including:
  • the detection box can form a closed cavity under the action of the drive assembly, the cavity is used to accommodate at least one product to be tested, and the control box is provided with an inlet and outlet communicating with the cavity.
  • the image acquisition device is used to collect images in the cavity in real time and perform image analysis when performing air tightness testing, so as to output image analysis results to determine the air tightness of the tested product.
  • an embodiment of the present invention also provides an air-tightness detection system, which includes a film coating device and the air-tightness detection equipment, and the film coating device is used for testing the surface of the product to be tested before testing. A detection film is formed. When the air tightness of the tested product is unqualified, the detection film will be deformed during the detection process.
  • an embodiment of the present invention also provides an air tightness detection method, the method includes:
  • the cavity is pressure-maintained according to the preset pressure-holding time, and images of the tested product are collected in real time;
  • the air-tightness detection equipment, detection system, and air-tightness detection method provided by the embodiments of the present application collect images of the tested product in an air-tightness test in a closed environment, and analyze the images to determine whether the tested product meets the requirements Airtightness requirements, this kind of test equipment is small in size, test efficiency is improved, and will not cause damage to the tested product, can meet the needs of batch product testing, and can be compatible with the testing of products of different specifications.
  • the embodiment of the present invention provides an airtightness detection device, which can be used for airtightness detection of electronic products with airtightness or waterproofness detection requirements, especially for airtightness detection of small-volume electronic products.
  • the air-tightness detection equipment provided in the embodiments of the present invention can also be used for detection.
  • the electronic product to be detected may be a single electronic functional module, such as a camera module, or an assembled electronic product, such as photographing equipment, mobile terminals, tablet computers, smart wearable devices, and so on.
  • the air-tightness detection equipment provided by the embodiment of the present invention includes a control box 10, a detection box 20 and a drive assembly 30 arranged on the control box 10, which are arranged in cooperation with the detection box 20
  • the image acquisition device 40 wherein the detection box 20 can form a closed cavity under the action of the drive assembly 30, the cavity is used to contain at least one product under test, the control box 10 is provided There is an air inlet and outlet assembly 11 connected to the cavity; the image acquisition device 40 can collect images in the cavity in real time and perform image analysis during air tightness testing, so as to output image analysis results to determine the product under test Air tightness.
  • the detection box 20 and the outer side of the drive assembly 30 may also be provided with a protective cover assembly 50, and the cover assembly 50 may be fixed on the
  • the control box 10 can also be connected to the drive assembly 30.
  • the auxiliary detection objects may be detection films coated on the surface of the tested product, and the detection film may be fluidity.
  • Foam film or soft plastic film when the cavity is inflated or pumped through the air inlet and outlet assembly 11, the air pressure inside and outside the tested product can form a pressure difference, and the air on the side with higher pressure has a pressure The tendency of flow on the small side. If the tested product leaks, the detection film at the leak position will be deformed or significantly deformed due to the flow of air. At this time, the image collected by the image acquisition device 40 can be analyzed.
  • the location of the deformation of the detection film can not only determine whether the tested product is leaking, but also determine the location of the tested product when the tested product is leaking; of course, if the tested product does not leak or the degree of leakage If the preset range is satisfied, the detection film in the image collected by the image collection device 40 will not be deformed or the deformation will not be obvious.
  • the number of tested products put into the cavity of the detection box 20 may be two or more, which facilitates batch detection and improves detection efficiency.
  • the image acquisition device 40 may be disposed in the cavity, specifically it means that the image acquisition device 40 is entirely located in the cavity and fixed on the cavity wall of the cavity.
  • the camera of the image acquisition device 40 faces the detection position in the cavity, and the image acquisition device 40 communicates with external components in a wireless connection mode; or the image acquisition device 40 and the external components Wired connection, which penetrates the wall of the detection box 20 and enters the cavity.
  • the camera of the image acquisition device 40 faces the detection position in the cavity. At this time, the camera can be directly embedded On the box wall of the detection box 20, the connecting wire connecting the camera may pass through the box wall, so that the camera at the end of the connecting wire is suspended in the cavity.
  • the camera 41 is inlaid on the wall of the box; or the image acquisition device 40 is arranged outside the detection box 20, at this time the detection box 20 is made of transparent material, and the image acquisition device 40 is located at the One side of the detection box 20, and the camera of the image acquisition device 40 passes through the box body of the detection box 20 toward the detection position in the cavity.
  • the number of cameras included in the image acquisition device 40 may be 1 to 4. It should be noted that whether the image acquisition device 40 is located in the cavity or in the detection box 20 In addition, the number of the cameras is specifically based on the cameras being able to cover the detected parts on the tested product. In some embodiments, the number of cameras may also be higher than 4, which is not limited here.
  • the detection box 20 includes a base 21 and a cover 22, and the base 21 is fixed on the control box 10.
  • the base body 21 is fixedly connected to the upper box plate of the control box 10;
  • the cover body 22 is fixedly connected to the drive assembly 30, and the drive assembly 30 can drive the cover body 22 to move, so that the cover body 22 is resisted or separated from the seat body 21, wherein when resisting, it is used to form a closed cavity, and when separated, it is used to take and place the tested product;
  • the air inlet and outlet assembly 11 communicates with the inner cavity of the seat body 21 , Wherein the entire image acquisition device 40 or the camera of the image acquisition device 40 can be fixed to the inner wall of the base 21 or the cover 22.
  • a sealing member 23 may be arranged between the cover body 22 and the seat body 21 to increase the airtightness of the cavity.
  • the sealing member 23 may be a rubber ring.
  • the cover body 22 and/or the seat body 21 may also be provided with a receiving groove for the sealing member 23. In FIG. 2, the seat body 21 is provided with a receiving groove, and the sealing member 23 is located in the In the accommodating groove of the seat body 21.
  • the drive assembly 30 includes a support 31 and a drive 32 fixed on the support 31, and the drive 32 is fixedly connected to the cover 22
  • the driving member 32 can drive the cover body 22 to move, so that the cover body 22 and the seat body 21 can resist or separate.
  • the driving member 32 may be a driving cylinder or a driving motor
  • the supporting member 31 may be a supporting plate or a supporting frame.
  • the driving rod 321 of the driving member 32 may be directly connected to the cover body 22, or may be connected to the cover body 22 through an adapter plate. As shown in FIG. 3, it is connected through an adapter plate 301.
  • At least one guide rail 302 can be further provided on the support 31, and the cover 22 or the adapter plate is slidably connected to the guide rail 302 through at least one slider 303, and the guide rail 302 The movement of the cover 22 can be guided to limit the movement track of the cover 22.
  • the supporting member 31 is further provided with at least one buffer member 33, and the buffer member 33 protects the cover when the driving member 32 drives the cover body 22 to separate from the seat body 21.
  • the movement of the body 22 is buffered, and at the same time the movement range of the cover body 22 is restricted.
  • the control box 10 is also provided with a protective member 60 for feeding protection.
  • the protective member 60 can be directly installed on the upper box plate of the control box 10, or can be installed through a mounting plate.
  • the protective member 60 can be a safety grating.
  • the safety grating includes a transmitting end and a receiving end, which are respectively arranged at opposite ends of the control box 10 .
  • the driver 32 is used to compress the seat body 21 and the cover body 22 to create a closed environment, and at the same time, the seat body 21 and the cover body 22 can be conveniently separated, facilitating the taking and placing of the tested product.
  • the air tightness detection device may further include an air pressure detection device (not shown in the figure), and the air pressure detection device can collect the air tightness detection in real time.
  • the air pressure in the cavity is used to output the air pressure detection result and cooperate with the image analysis result to determine the air tightness of the tested product.
  • the air pressure detection device is an air-tightness instrument independent of the detection box 20, and the air-tightness instrument inflates or evacuates the cavity through the air inlet and outlet assembly 11, and inflates Or detect the pressure change in the cavity in real time after pumping; the sensitivity of the air-tight instrument is higher than that of the barometer, which can monitor the air pressure in real time.
  • the air-tight instrument can control and monitor the air pressure in the cavity to achieve the Detection of small air leaks.
  • the inside of the detection box 20 is continuously pressurized or decompressed by the air-tight instrument.
  • the process of pressurization or decompression is generally controlled within a specific time period, such as 1 to 5.
  • the preset time for the pressure hold is related to the type of product being tested and the pressurization or reduction
  • the rated value of the pressure is related, and can be set according to the actual situation in the actual plan, so as to meet the test requirements and not cause damage to the tested product; when the pressure is maintained, there will be a pressure difference between the inside and the outside of the tested product, and the pressure is high There is a tendency for the air on the side to penetrate to the side with a lower pressure. If the pressure is maintained for a period of time, if the air pressure detection device detects that the air pressure inside the detection box 20 does not change, it means that the product under test is airtight If the air pressure detection device detects a change in the air pressure inside the detection box 20, it indicates that the product under test is leaking.
  • the airtight instrument initially pressurizes the detection box 20, the detection box 20 The internal air pressure will decrease. If the air-tight instrument initially pressurizes the detection box 20, the air pressure inside the detection box 20 will increase; in this way, with the image acquisition device 40, the defective products can be quickly screened out and the air leakage of the defective products can be determined
  • the location facilitates the identification of the airtightness of the tested product, does not damage the tested product, and improves the product line yield and production efficiency. In actual situations, different tested products have different degrees of air leakage.
  • the air pressure change threshold can be set, and only when the air pressure change exceeds the threshold can it be judged that the tested product does not meet the air tightness
  • the air pressure change threshold can be obtained by testing qualified products.
  • the image acquisition device 40 is electrically connected to the control assembly provided in the control box 10.
  • the control assembly includes a control board 12 and a button group connected to the control board 12, and the button group partially penetrates the control box 10, the control board 12 can be connected to the button group, the driving member 32 and the image acquisition device 40 respectively.
  • the air inlet and outlet assembly 11 can also be connected to control the Regarding the opening or closing of the air inlet and outlet assembly 11, in a specific embodiment, as shown in FIG.
  • the button group includes but is not limited to a start button (121a, 121b), a reset button 122, an emergency stop button 123, etc.
  • Two activation buttons are provided to control the activation of different components, such as the activation of the driver 32 and the activation of the image acquisition device 40. Of course, other components can also be activated, which is not limited here.
  • the box body of the control box 10 is also provided with a display device 13 and/or a speaker device 14 connected to the control board 12, wherein the display device 13 can be used for displaying The detection parameters and detection results, etc., as shown in FIG.
  • the display device 13 in this embodiment includes a display screen 131 and a screen cover 132 that protects the display screen 131, and the image acquisition device 40 cooperates
  • the display screen 131 When the display screen 131 is used, the collected images can also be displayed in the display screen 131 in real time, and the structural changes on the surface of the tested product can be directly observed to analyze and determine whether the tested product is leaking and confirm the location of the leak; the speaker device 14 can be used to prompt whether the tested product is leaking or for equipment failure alarms.
  • the box body of the control box 10 includes a top plate 101, a bottom plate 102 and side plates (103a, 103b, 103c, 103d), the button group, the display device 13 and The speaker devices 14 can be located on the same side panel or on different side panels; in some embodiments, the top panel 101 and the side panel are movably connected.
  • the inside of the control box 10 is installed or overhauled. Under normal circumstances, the top plate 101 and the side plate can be locked by locking members (15a, 15b); in other embodiments, the side plate is also Lifting parts (16a, 16b) can be provided to facilitate the transportation of the detection box 20 or the overall transportation of the air tightness detection equipment.
  • the air-tightness testing equipment facilitates the taking and placing of the tested product.
  • the airtightness test is performed by inflating or pumping air in a closed environment, and covering the air-tightness test after inflation or pumping.
  • the image of the tested product of the film is collected, and the image is analyzed to determine whether the tested product meets the air-tightness requirements.
  • This kind of test equipment is small in size, convenient to operate, and the test efficiency is improved, and it will not cause damage to the tested product, and defective products It can be recycled and reworked, can meet the needs of batch product testing, and can be compatible with the testing of products of different specifications.
  • the image acquisition device 40 combined with the air pressure detection device can more quickly determine the air tightness of the tested product and improve the detection efficiency.
  • the embodiment of the present invention also provides an air-tightness detection system, which can be used for the air-tightness detection of products, including a film-coating device and the above-mentioned air-tightness detection equipment.
  • a detection film is formed on the surface of the product. When the air tightness of the tested product is unqualified, the detection film will be deformed during the detection process.
  • the detection film may be a fluid foam film or a flexible plastic film, and accordingly, the film coating device may be a foam film coating device or a plastic film coating device.
  • the air-tightness detection system may further include a loading and unloading device for loading the tested product with the film into the cavity, and loading the tested product into the cavity.
  • the product to be tested is removed from the cavity; in some embodiments, the loading and unloading device may also be used for loading and unloading of film coating operations, which is not limited herein.
  • the air-tightness detection system performs a laminating operation on the tested product to be tested, and inflating or exhausting the airtight environment in which the tested product is covered, and then the tested product Image acquisition is performed to determine whether the product under test meets the air tightness requirements by analyzing the image.
  • This test equipment is small in size, improves test efficiency, and does not cause damage to the product under test. It can meet the needs of batch product testing and is compatible.
  • the test of products of different specifications, in addition, combined with the air pressure detection device can more quickly determine the air tightness of the tested product, and improve the detection efficiency.
  • the embodiment of the present invention also provides an air tightness detection method, which is applied to the above-mentioned air tightness detection system. As shown in FIG. 5, the method includes:
  • the cavity is pressure-maintained according to the preset pressure-holding time, and images of the tested product are collected in real time;
  • the detection film is a fluid foam film or a flexible plastic film.
  • the thickness of the fluid foam film can be configured to be 3 to 7 mm.
  • the detection film at the leaking position will be deformed or significantly deformed due to the flow of air.
  • the image collected by the image acquisition device 40 can be analyzed to determine the location of the detection film deformation, which can not only determine whether the tested product is leaking, but also determine the leak location of the tested product when the tested product leaks to detect the film adoption
  • the foam film In the inflation or pumping stage, the foam film has a certain degree of stability because the inflation or pumping process is smooth, and the model of the foam film will not change due to inflation or pumping. In the pressure phase, if the tested product does not leak, the foam film will maintain the film shape unchanged.
  • the number of tested products put into the cavity of the detection box 20 may be two or more, which facilitates batch detection and improves detection efficiency.
  • the pressurization or decompression process inside the detection box 20 is generally controlled within a specific time period, such as 1 to 5 seconds, and the air pressure inside the detection box 20 is pressurized or Reduce pressure to a rated value.
  • the pressure holding time after pressurization or decompression inside the detection box 20 can also be set for a preset pressure holding time.
  • the pressure holding time of the cavity is 8 to 12 minutes.
  • the preset duration of pressure is related to the type of product under test and the rated value of pressure or pressure. It can be set according to the actual situation in the specific plan to meet the test requirements without causing damage to the product under test; In the process of holding pressure, there will be a pressure difference between the inside and outside of the tested product.
  • the method further includes real-time detection of the air pressure in the cavity; at this time, the air pressure detection result in the cavity and the image analysis result can be comprehensively checked. Determine the air tightness of the product. Specifically, after the product to be tested is put into the detection box 20, and after inflating or evacuating and maintaining pressure for a period of time, if the air pressure inside the detection box 20 does not change, it means that the tested product has good air tightness.
  • the air pressure change can also determine the air tightness of the product; if the air pressure inside the detection box 20 changes, it means that the product under test is leaking. Among them, if the airtight instrument initially pressurizes the detection box 20, the inside of the detection box 20 The air pressure will decrease. If the airtight instrument initially pressurizes the detection box 20, the air pressure inside the detection box 20 will increase, and the defective products will be quickly screened out. At this time, with the image acquisition device 40, the air leakage of the defective products can be quickly determined Location, the process of checking whether the air tightness of the tested product meets the requirements does not damage the tested product, which improves the product line yield and production efficiency.
  • the air pressure change threshold can be set. Only when the air pressure change exceeds the threshold can the tested product not meet the air tightness requirements.
  • the air pressure change threshold can be obtained by testing qualified products.
  • the airtightness detection method provided by the embodiment of the present invention puts the covered product into a closed environment, inflates or evacuates the closed environment, and is in an airtightness test after inflating or evacuating Image acquisition of the tested product, through analyzing the image to determine whether the tested product meets the airtightness requirements, the test efficiency of this test method is improved, and it will not cause damage to the tested product, which can meet the needs of batch product testing. Compatible with the testing of products of different specifications.

Abstract

L'invention concerne un dispositif, un système et un procédé de détection d'étanchéité à l'air. Le dispositif de détection d'étanchéité à l'air comprend un boîtier de commande (10), un boîtier de détection (20) et un ensemble d'entraînement (30), qui sont disposés sur le boîtier de commande (10), et un dispositif de collecte d'images (40) disposé en coordination avec le boîtier de détection (20), le boîtier de détection (20) pouvant former une cavité fermée sous l'action de l'ensemble d'entraînement (30), la cavité étant utilisée pour recevoir au moins un produit à tester, et un ensemble entrée et sortie d'air (11) en communication avec la cavité est disposée dans le boîtier de commande (10) ; et le dispositif de collecte d'images (40) est utilisé pour collecter une image dans la cavité en temps réel et effectuer une analyse d'image pendant la détection d'étanchéité à l'air afin de délivrer en sortie un résultat d'analyse d'image de façon à déterminer l'étanchéité à l'air du produit à tester. Au moyen de la réalisation d'une collecte d'images sur un produit à tester dans un environnement fermé et de l'analyse de l'image, il est possible de déterminer si le produit à tester répond aux exigences d'étanchéité à l'air. L'efficacité de test est améliorée, le produit à tester n'est pas endommagé, les exigences pour tester des produits par lots sont satisfaites, et la présente invention est compatible avec le test de produits de différentes spécifications.
PCT/CN2019/092404 2019-06-21 2019-06-21 Dispositif, système et procédé de détection d'étanchéité à l'air WO2020252788A1 (fr)

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CN201980012100.7A CN111699372B (zh) 2019-06-21 2019-06-21 一种气密性检测设备、检测系统及检测方法
PCT/CN2019/092404 WO2020252788A1 (fr) 2019-06-21 2019-06-21 Dispositif, système et procédé de détection d'étanchéité à l'air

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