CN113532763A - Air tightness detection device and detection method thereof - Google Patents
Air tightness detection device and detection method thereof Download PDFInfo
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- CN113532763A CN113532763A CN202111091326.6A CN202111091326A CN113532763A CN 113532763 A CN113532763 A CN 113532763A CN 202111091326 A CN202111091326 A CN 202111091326A CN 113532763 A CN113532763 A CN 113532763A
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- 238000001514 detection method Methods 0.000 title claims abstract description 89
- 238000012360 testing method Methods 0.000 claims abstract description 79
- 238000003825 pressing Methods 0.000 claims abstract description 71
- 239000000463 material Substances 0.000 claims abstract description 56
- 239000000969 carrier Substances 0.000 claims abstract description 21
- 239000002184 metal Substances 0.000 claims abstract description 19
- 239000011521 glass Substances 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 66
- 238000004364 calculation method Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 description 10
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- 238000010586 diagram Methods 0.000 description 5
- 230000033001 locomotion Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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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
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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Abstract
The invention discloses air tightness detection equipment and a detection method thereof, which are used for detecting the air tightness between glass and metal parts in a lens and comprise a case, a product feeding device, a material moving device and a detection device, wherein the detection device comprises a plurality of second product carriers, a plurality of pressing devices and a plurality of leakage testers, and the pressing devices are arranged above the second product carriers and correspond to the second product carriers one by one; the invention forms the test cavity by adopting the matching between the second product carrier and the pressing device, inputs air into the lens through the air input device, detects the air quantity flowing from the lens to the test cavity through the leakage tester, calculates the leakage rate of the lens through the leakage rate formula, and calibrates the leakage tester through the standard test block before the leakage tester tests, thereby avoiding the detection error caused by the problems of the leakage tester, having smaller detection error and higher precision.
Description
Technical Field
The invention relates to the technical field of nonstandard automation equipment, in particular to air tightness detection equipment and a detection method thereof.
Background
At present, a metal sheet and a glass lens are arranged on the periphery of a mobile phone camera, and after the metal lens and the glass lens are assembled, firmness and air tightness of the assembled product need to be detected. The traditional detection mode is that the detection is performed one by manually holding a detection instrument, so that the detection efficiency is low; and the volume of product is less, and hand-held type detecting instrument direct detection whether leaks gas can't discern the less condition of gas leakage to there is the great, the relatively poor condition of precision of detection error, consequently, hand-held type detecting instrument is not applicable to the camera lens that needs high accuracy to detect. In addition, when the product is more, staff intensity of labour is big, and is higher to personnel's requirement, and the manual detection has great error, and enterprise's manufacturing cost is higher.
In the existing product air tightness detection operation, for example, chinese patent CN206772503U discloses an air tightness detection device, which includes a frame, a press driving device, a lower die, an upper die, a vacuum generator and a detection device, wherein the press driving device is disposed in the frame, the press mold is disposed in the press driving device, the press mold is disposed on one side of the frame, the press mold includes an upper die and a lower die, the lower die is disposed below the upper die, the lower die corresponds to the upper die, the vacuum generator is disposed in the press driving device, the vacuum generator is connected to the lower die through an air pipe, the detection device is disposed in the press driving device, and the detection device corresponds to the lower die. Compared with a handheld detection instrument, the air tightness detection equipment has the advantages that the detection efficiency is obviously improved, and the production cost of an enterprise is obviously reduced. However, the detection sensor is used for detecting the air tightness, and the existing sensor has the problems of low precision and large error when used for detecting the air tightness, so that the application cannot be met. Meanwhile, in the detection process of the device, the switching period between the execution units is long, the moving precision of the lower die cannot be regulated and controlled, and the product is easy to damage.
Therefore, the device for detecting the air tightness between the glass and the metal piece in the lens is developed, the problems of low detection precision and low efficiency of the existing air tightness detection device can be solved, the detection efficiency is further improved, and the practical significance is obviously achieved.
Disclosure of Invention
The invention aims to provide a device for detecting the air tightness between glass and metal parts in a lens.
In order to achieve the purpose, the invention adopts the technical scheme that: an air tightness detection device is used for detecting air tightness between glass and metal parts in a lens and comprises a case, a product feeding device, a material moving device and a detection device, wherein the product feeding device, the material moving device and the detection device are all arranged above the case;
the detection device comprises a plurality of second product carriers, a plurality of pressing devices and a plurality of leakage testers, the number of the pressing devices is the same as that of the second product carriers, and the pressing devices are arranged above the second product carriers and correspond to the second product carriers one by one;
each second product carrier comprises a positioning device and a plurality of product positioning devices arranged on the positioning device, each product positioning device is of a hollow structure, a product contour hole for embedding a part of lens and a sealing ring placing hole arranged on the periphery of the product contour hole are formed in each product positioning device, the sealing ring placing hole is used for placing a sealing ring, and a plurality of first air ducts communicated with the hollow structure of the product positioning device are arranged on each positioning device;
each pressing device comprises a lifting device, a plurality of pressing blocks arranged on the output end of the lifting device and a second air duct arranged on the pressing blocks, an air flow duct is arranged inside each pressing block and communicated with the second air duct, and the leakage tester is connected with the pressing blocks through a third air duct;
a test cavity is formed among the pressing block, the sealing ring and the lens;
the product feeding device is used for moving the lens from the outside of the air tightness detection equipment to the inside of the air tightness detection equipment;
the material moving device comprises a loading module and an unloading module, the loading module is used for moving the lens from the product loading device to the product contour hole of the second product carrier, and the unloading module is used for moving the lens from the product contour hole to the outside of the air tightness detection device.
Preferably, the number of the pressing blocks is the same as that of the product positioning devices, and the number of the leak testers is the same as that of the pressing blocks.
Preferably, the metal piece in the lens comprises an upper end part and a lower end part, the upper end part and the lower end part are both hollow columnar structures, the cross-sectional area of the upper end part is larger than that of the lower end part, the glass in the lens is adhered to the end face, far away from the lower end part, of the upper end part of the metal piece, the shape of the product contour hole is the same as that and size of the lower end part of the metal piece, the lower end part of the metal piece is embedded into the product contour hole, the shape of the sealing ring is the same as that of the cross section of the upper end part of the lens, the sealing ring is placed on the periphery of the upper end part of the metal piece, the size of the inner ring of the sealing ring is the same as that of the outer ring of the upper end part or slightly larger than that of the outer ring of the upper end part, and the shape of the inner ring of the sealing ring is the same as that of the outer ring of the upper end part, the shape and the size of the outer ring of the sealing ring are the same as those of the outer ring of the sealing ring placing hole.
Preferably, the pressing block and the outer ring of the sealing ring placing hole are the same in shape and size, and when the lifting device drives the pressing block to move downwards to the position above the product positioning device, if the size of the inner ring of the sealing ring is the same as the size of the outer ring of the upper end part, the lifting device drives the pressing block to move downwards to be in contact with the sealing ring, and then the pressing block stops moving downwards continuously; if the size of the inner ring of the sealing ring is slightly larger than the size of the outer ring of the upper end part, namely a certain distance exists between the sealing ring and the upper end part, the lifting device drives the pressing block to move downwards to be in contact with the sealing ring, and then the pressing block continues to move downwards until the deformed sealing ring is in contact with the upper end part, and then the downward movement can be stopped; in the above, the distance between the sealing ring and the upper end portion needs to be controlled within the deformable range of the sealing ring, that is, the deformed sealing ring can contact with the upper end portion.
Preferably, the upper end portion and the lower end portion are both hollow cylindrical structures, the diameter of the upper end portion is larger than that of the lower end portion, the sealing ring is a circular sealing ring, and the diameter of an inner ring of the sealing ring is the same as or slightly larger than that of an outer ring of the upper end portion.
Preferably, the first air duct is further communicated with an air input device, and the air input device is used for conveying air from the first air duct to the product positioning device.
Preferably, the leakage tester also comprises a plurality of pressure regulating devices, wherein each pressure regulating device is connected with a fourth air duct, and the fourth air duct communicates the pressure regulating device with the leakage tester.
Preferably, a cavity is arranged inside the pressing block.
Preferably, the third vent pipe is provided with a three-way leak hole, the third vent pipe connected to the leak tester is divided into two branches after passing through the three-way leak hole, one branch is communicated with the second vent pipe on the pressure block, and the other branch is communicated with the cavity in the pressure block.
Preferably, product loading attachment includes material loading manipulator and rotatory material platform, be connected with a plurality of material loading suction head on the material loading manipulator, rotatory material platform includes that rotary cylinder and the product of connection on the rotary cylinder output end place the platform, the product is placed and is provided with two at least first product carriers on the platform, every be provided with the station is placed to the first product of a plurality of in the first product carrier.
Preferably, the loading module and the unloading module have the same structure, the loading module and the unloading module are arranged on the chassis in mirror symmetry relative to the second product carrier, the loading module and the unloading module both comprise a first movable module and a carrying device arranged on the first movable module, the carrying device comprises a second movable module and a rotating device connected to the second movable module, a third movable module is connected to an output end of the rotating device, and a plurality of carrying suction heads are connected to the third movable module in a sliding manner.
Preferably, the first moving module is a Y-axis moving module, the second moving module is an X-axis moving module, and the third moving module is a Z-axis moving module.
Preferably, the number of said handling tips is the same as the number of said first product placement stations.
Preferably, product loading attachment, move material device and detection device all are provided with the product sensor that targets in place, product loading attachment and move material device all are provided with positioning sensor, the product sensor that targets in place is used for detecting whether the camera lens targets in place, positioning sensor is used for detecting the motion position of camera lens.
Preferably, the airtightness detection device is further provided with a control system, the control system is located inside the case, the control system comprises a driving unit, a data processing unit and a main control system, the data processing unit is used for acquiring a threshold value and receiving and processing data tested in the leakage tester, the main control system is used for receiving product in-place data acquired by the product in-place sensor and product positioning data acquired by the positioning sensor and converting the product positioning data and the product in-place data into control signals to be transmitted to the driving unit, and the driving unit is used for driving the operation of the product feeding device, the material moving device and the detection device in the device.
The application also claims an air tightness detection method, which adopts the air tightness detection equipment, and comprises the following specific steps:
s1, selecting a standard test block with the same material and the same shape as the lens, placing the standard test block in a product limiting hole in the product positioning device, and placing a sealing ring in the sealing ring placing hole;
s2, the lifting device drives the pressing block to move downwards to the position above the product positioning device and continues to move downwards until the pressing block tightly presses the sealing ring; selecting the type and the test pressure of the leakage tester, and reading a test value;
s3, repeating the steps S1-S2 for at least 10 times, reading the test values one by one, calculating the average value of pressure drop among all the obtained test values to be used as the standard pressure drop value P1 of the leakage hole, inputting the obtained standard pressure drop value P1 of the leakage hole into the leakage tester, calculating the average value of air leakage among all the obtained test values to be used as the standard air leakage value F1, and inputting the obtained standard air leakage value F1 into the leakage tester;
s4, taking out the standard test block in the product limiting hole, and completing the calibration of the leakage tester;
s5, moving the lens from the outside of the air tightness detection equipment to the air tightness detection equipment through the product feeding device;
s6, moving the lens from the product loading device to a product contour hole of the second product carrier through the loading module;
s7, the lifting device drives the pressing block to move downwards to the position above the product positioning device and continues to move downwards until the pressing block tightly presses the sealing ring; keeping the type and the test pressure of the leakage tester unchanged, and reading a test value;
s8, calculating according to the test values obtained in the S7 to obtain a leakage rate;
s9, comparing the leakage rate calculated in the S8 with a threshold value, and judging that the lens is an NG material or an OK material;
s10, moving the lens from the product contour hole of the second product carrier to the outside of the air tightness detection device through the unloading module;
and S11, repeating the steps S5-S10 until all the lenses needing to be detected are detected.
Preferably, the steps S1-S4 are performed under the condition that the air tightness detection device runs for at least 3 minutes without a lens, the calibration cycle time of the steps S1-S4 is at least twice in the service life of the device, and the standard leakage hole pressure drop value P1 and the standard leakage hole value F1 are internal parameters of the instrument to be calibrated before the leakage tester is tested.
Preferably, in step S2, the size of the inner ring of the sealing ring is slightly larger than the size of the outer ring of the upper end portion, that is, a certain distance exists between the sealing ring and the upper end portion, the lifting device drives the pressing block to move downward until the deformed sealing ring contacts with the upper end portion, and then the pressing block stops moving downward, the deformed sealing ring has an inner ring in close contact with the upper end portion, and an outer ring of the sealing ring has an outer ring in close contact with the sealing ring placing hole.
Preferably, the test values read in step S7 include a volume V, a pressure difference change Δ p, and a test time Δ t, the volume V includes the volume of the leak tester, the first vent pipe, the second vent pipe, the third vent pipe, and the airflow pipe, and the volume V is calculated by directly measuring the diameter and height of the leak tester, the first vent pipe, the second vent pipe, the third vent pipe, and the airflow pipe; the pressure difference change delta P is a pressure change value of the lens before and after the lens is tested in the step S7, and a value of the pressure difference change delta P is influenced because a certain error exists in a pressure value of the lens before the lens is tested in the step S7 by direct measurement, the specific value of the pressure difference change delta P is obtained by an indirect calculation method, and the specific value of the pressure difference change delta P is obtained by subtracting a standard air leakage hole pressure drop value P1 from a pressure value of the lens after the lens is tested in the step S7; and a pressure sensor is arranged in the leakage tester, and the pressure value of the lens after the test in the step S7 is obtained by the pressure sensor arranged in the leakage tester.
Preferably, the specific steps of step S5 are: the material loading manipulator comprises a material loading manipulator, wherein a material loading suction head in the material loading manipulator sucks a lens from the outside of air tightness detection equipment to a first product carrier of a rotary material platform, a product in-place sensor detects product in-place data, a rotary cylinder in the rotary material platform drives the product placing platform and the first product carrier on the product placing platform to rotate, the first product carrier on which the lens is placed after rotation is close to a loading module, the first product carrier close to the loading module waits for the loading manipulator to load when the loading module waits for the lens to be removed, and the first product carrier far away from the loading module waits for the material loading, so that the material loading period is shortened.
Preferably, the specific steps of step S6 are: when the positioning sensor detects product positioning data, the first moving module drives the carrying device to move to one side close to the product feeding device, when the carrying device moves to one side of the product feeding device, the second moving module, the rotating device and the third moving module on the carrying device drive and adjust the position of the carrying suction head together to suck the lens on the first product carrier through the carrying suction head, after the product in-place sensor detects product in-place data, the second moving module, the rotating device and the third moving module on the carrying device drive and achieve returning of the carrying suction head together, and after returning is completed, the first moving module drives the carrying device to move to one side close to the second product carrier, and the lens is placed in the second product carrier.
Preferably, the test value read in step S2 and the test value read in step S7 are both transmitted to a data processing unit in the control system for processing.
Preferably, the threshold in step S8 is a value set manually, and/or a resulting tolerance calculated from the leak rate obtained in step S8 for several shots; the number of shots may be all shots or randomly selected portions of shots.
Preferably, the calculation formula of the leakage rate in step S8 is: f (sccm) = (60/101300) × V × Δ P/Δt; 60/101300 is the deformation of the standard atmospheric pressure and time calculation formula, V is the volume V, Δ P is the pressure difference change Δ P, and Δ t is the test time Δ t.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1. compared with the Chinese patent CN206772503U, the invention forms a test cavity by adopting the matching of the second product carrier and the pressing device, inputs air into the lens through the air input device, detects the air quantity flowing into the test cavity from the lens through the leakage tester, calculates the leakage rate of the lens through the calculation formula of the leakage rate, and calibrates the leakage tester through the standard test block before the leakage tester tests, thereby avoiding the detection error caused by the problems of the leakage tester, having smaller detection error and higher precision;
2. according to the invention, by arranging the plurality of second product carriers, the plurality of pressing devices and the plurality of leakage testers, a plurality of lenses can be measured simultaneously, and the measurement efficiency is higher;
3. according to the invention, the plurality of first product carriers are arranged in the product feeding device, and the first product carriers are driven to rotate according to the rotating cylinder in the rotating material table, so that synchronous feeding and discharging can be realized, and the feeding period is shortened; the product in-place sensor and the positioning sensor are used for detecting the position of a product in real time, so that the product can be placed in place, the product feeding device, the material moving device and the detection device can be driven in a matched mode, and the transmission efficiency is high;
4. the invention does not need manual operation, and has high automation degree and high working efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that some of the drawings in the following description are embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic overall structure diagram according to a first embodiment of the present invention;
fig. 2 is a schematic structural view illustrating a pressing device pressing above a second product carrier according to a first embodiment of the present invention;
FIG. 3 is a cross-sectional view of portion A of FIG. 2 according to a first embodiment of the present invention;
FIG. 4 is a schematic air flow diagram of FIG. 3 according to a first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a product loading device in the first embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a loading module according to a first embodiment of the present invention;
fig. 7 is a schematic structural diagram of a second product carrier according to a first embodiment of the invention.
Wherein, 1, a case; 2. a product feeding device; 3. a material moving device; 4. a detection device; 5. a second product carrier; 6. a pressing device; 7. a leak tester; 9. a loading module; 10. unloading the module; 11. a lens; 12. an upper end portion; 13. a lower end portion; 14. a pressure regulating device;
21. a feeding manipulator; 22. a feeding suction head; 23. a product placement table; 24. a first product carrier; 25. a first product placement station; 26. a rotating cylinder;
51. a positioning device; 52. a product positioning device; 53. product profiling holes; 54. a seal ring placing hole; 55. a seal ring; 56. a first vent conduit;
61. a lifting device; 62. briquetting; 63. a second vent conduit; 64. an air flow conduit; 65. a test chamber;
91. a first moving module; 92. a carrying device; 93. a second moving module; 94. a rotating device; 95. a third moving module; 96. and (5) carrying the sucker.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 1 to 7, an air tightness detection apparatus for detecting air tightness between glass and metal parts in a lens 11 includes a case 1, a product feeding device 2, a material moving device 3, and a detection device 4, wherein the product feeding device 2, the material moving device 3, and the detection device 4 are all disposed above the case 1;
the detection device comprises a plurality of second product carriers 5, a plurality of pressing devices 6 and a plurality of leakage testers 7, the number of the pressing devices is the same as that of the second product carriers, and the pressing devices are arranged above the second product carriers and correspond to the second product carriers one by one;
each second product carrier 5 comprises a positioning device 51 and a plurality of product positioning devices 52 arranged on the positioning device 51, each product positioning device is of a hollow structure, a product profiling hole 53 for embedding a part of lens and a sealing ring placing hole 54 arranged on the periphery of the product profiling hole are arranged in each product positioning device, the sealing ring placing hole is used for placing a sealing ring 55, and a plurality of first air ducts 56 communicated with the hollow structure of the product positioning device are arranged on each positioning device;
each pressing device 6 comprises a lifting device 61, a plurality of pressing blocks 62 arranged on the output end of the lifting device and a second vent pipeline 63 arranged on the pressing blocks, an airflow pipeline 64 is arranged inside each pressing block and communicated with the second vent pipeline, and the leakage tester is connected with the pressing blocks through a third vent pipeline;
a test cavity 65 is formed among the pressing block, the sealing ring and the lens;
the product feeding device is used for moving the lens from the outside of the air tightness detection equipment to the inside of the air tightness detection equipment;
the material moving device comprises a loading module 9 and an unloading module 10, the loading module is used for moving the lens from the product loading device to the product contour hole of the second product carrier, and the unloading module is used for moving the lens from the product contour hole to the outside of the air tightness detection device.
Furthermore, the number of the pressing blocks is the same as that of the product positioning devices, and the number of the leakage testers is the same as that of the pressing blocks.
Further, the metal piece in the lens 11 includes an upper end portion 12 and a lower end portion 13, the upper end portion and the lower end portion are both hollow cylindrical structures, the cross sectional area of the upper end portion is larger than that of the lower end portion, that is, the diameter of the upper end portion is larger than that of the lower end portion, the glass in the lens is bonded to the end face, far away from the lower end portion, of the upper end portion of the metal piece, the shape and size of the product imitation hole are the same as those of the lower end portion of the metal piece, the lower end portion of the metal piece is embedded into the product imitation hole, further, the sealing ring is a circular sealing ring, the sealing ring is placed on the periphery of the upper end portion of the metal piece, the diameter of an inner ring of the sealing ring is the same as that of an outer ring of the upper end portion or is slightly larger than that of the outer ring of the upper end portion, the shape and the size of the outer ring of the sealing ring are the same as those of the outer ring of the sealing ring placing hole.
Further, the pressing block and the outer ring of the sealing ring placing hole are the same in shape and size, when the lifting device drives the pressing block to move downwards to the position above the product positioning device, if the size of the inner ring of the sealing ring is the same as that of the outer ring of the upper end part, the lifting device drives the pressing block to move downwards to be in contact with the sealing ring, and then the pressing block stops moving downwards continuously; if the size of the inner ring of the sealing ring is slightly larger than that of the outer ring of the upper end part, namely a certain distance exists between the sealing ring and the upper end part, the lifting device drives the pressing block to move downwards to be in contact with the sealing ring and then continuously move downwards until the deformed sealing ring is in contact with the upper end part, and then the downward movement can be stopped; in the above, the distance between the sealing ring and the upper end portion needs to be controlled within the deformable range of the sealing ring, that is, the deformed sealing ring can contact with the upper end portion.
Further, the first air duct is also communicated with an air input device, and the air input device is used for conveying air from the first air duct to the product positioning device.
Further, the leakage tester also comprises a plurality of pressure regulating devices 14, wherein each pressure regulating device is connected with a fourth air duct, and the fourth air duct communicates the pressure regulating device with the leakage tester.
Further, product loading attachment includes material loading manipulator 21 and rotatory material platform, be connected with a plurality of material loading suction head 22 on the material loading manipulator, rotatory material platform includes revolving cylinder 26 and connects the product on the revolving cylinder output and places platform 23, the product is placed the bench and is provided with two first product carriers 24, every be provided with the station 25 is placed to the first product of a plurality of in the first product carrier.
Further, the loading module and the unloading module have the same structure, the loading module and the unloading module are placed on the chassis in mirror symmetry relative to the second product carrier, the loading module and the unloading module both include a first moving module 91 and a carrying device 92 arranged on the first moving module, the carrying device includes a second moving module 93 and a rotating device 94 connected to the second moving module, a third moving module 95 is connected to an output end of the rotating device, and a plurality of carrying suction heads 96 are slidably connected to the third moving module.
Furthermore, the first moving module is a Y-axis moving module, the second moving module is an X-axis moving module, and the third moving module is a Z-axis moving module.
Further, the number of handling tips is the same as the number of first product placement stations.
Furthermore, product loading attachment, move and all be provided with the product sensor that targets in place among material device and the detection device, all be provided with positioning sensor among product loading attachment and the material device that moves, the product sensor that targets in place is used for detecting whether the camera lens targets in place, positioning sensor is used for detecting the motion position of camera lens.
Furthermore, the gas tightness check out test set still is provided with control system, control system is located quick-witted incasement portion, control system includes drive unit, data processing unit and major control system, data processing unit is arranged in obtaining the threshold value and receiving and handling the data that test arrived in the leak tester, major control system is arranged in receiving the product that the product target in place sensor acquireed target in place data and the product location data that the position sensor acquireed and converting product location data and product target in place data into control signal transmission to drive unit, drive unit is arranged in product loading attachment, the material device that moves and the detection device operation in the drive device.
The embodiment also relates to an air tightness detection method, which adopts the air tightness detection device, and comprises the following specific steps:
s1, selecting a standard test block with the same material and the same shape as the lens, placing the standard test block in a product limiting hole in the product positioning device, and placing a sealing ring in the sealing ring placing hole;
s2, the lifting device drives the pressing block to move downwards to the position above the product positioning device and continues to move downwards until the pressing block tightly presses the sealing ring; selecting the type and the test pressure of the leakage tester, and reading a test value;
s3, repeating the steps S1-S2 for 20 times, reading the test values one by one, obtaining the average value of pressure drop of all the obtained test values as the standard leakage hole pressure drop value P1, inputting the obtained standard leakage hole pressure drop value P1 into the leakage tester, obtaining the average value of the leakage amount of all the obtained test values as the standard leakage value F1, and inputting the obtained standard leakage value F1 into the leakage tester;
s4, taking out the standard test block in the product limiting hole, and completing the calibration of the leakage tester;
s5, moving the lens from the outside of the air tightness detection equipment to the air tightness detection equipment through the product feeding device;
s6, moving the lens from the product loading device to a product contour hole of the second product carrier through the loading module;
s7, the lifting device drives the pressing block to move downwards to the position above the product positioning device and continues to move downwards until the pressing block tightly presses the sealing ring; keeping the type and the test pressure of the leakage tester unchanged, and reading a test value;
s8, calculating according to the test values obtained in the S7 to obtain a leakage rate;
s9, comparing the leakage rate calculated in the S8 with a threshold value, and judging that the lens is an NG material or an OK material;
s10, moving the lens from the product contour hole of the second product carrier to the outside of the air tightness detection device through the unloading module;
and S11, repeating the steps S5-S10 until all the lenses needing to be detected are detected.
Further, the steps S1-S4 are performed under the condition that the air tightness detection device runs for 5 minutes without a lens, the calibration cycle time of the steps S1-S4 is at least twice in the service life of the device, and the standard leakage hole pressure drop value P1 and the standard leakage hole value F1 are internal parameters of the leakage tester needing to be calibrated before the test.
Further, the standard leak value F1=0 obtained in step S3.
Further, in step S2, the size of the inner ring of the seal ring is slightly larger than the size of the outer ring of the upper end portion, that is, a certain distance exists between the seal ring and the upper end portion, the lifting device drives the press block to move downward until the deformed seal ring contacts with the upper end portion, and then the press block stops moving downward, the deformed seal ring has the inner ring in close contact with the upper end portion, and the outer ring of the seal ring has the outer ring in close contact with the seal ring placing hole.
Further, the test values read in step S7 include a volume V, a pressure difference change Δ p, and a test time Δ t, where the volume V includes the volumes of the leak tester, the first vent pipe, the second vent pipe, the third vent pipe, and the airflow pipe, and the volume V is calculated by directly measuring the diameters and heights of the leak tester, the first vent pipe, the second vent pipe, the third vent pipe, and the airflow pipe; the pressure difference change Δ P is a pressure change value of the lens before and after the test in the step S7, and a value of the pressure difference change Δ P is affected by a certain error in a pressure value of the lens before the test in the step S7, which is directly measured, in this embodiment, a specific value of the pressure difference change Δ P is obtained by an indirect calculation method, and the specific value of the pressure difference change Δ P is obtained by subtracting a pressure value of the lens after the test from a pressure drop value P1 of the standard air leakage hole and the pressure value of the lens after the test in the step S7; and a pressure sensor is arranged in the leakage tester, and the pressure value of the lens after the test in the step S7 is obtained by the pressure sensor arranged in the leakage tester.
Further, the specific step of step S5 is: the material loading manipulator comprises a material loading manipulator, wherein a material loading suction head in the material loading manipulator sucks a lens from the outside of air tightness detection equipment to a first product carrier of a rotary material platform, a product in-place sensor detects product in-place data, a rotary cylinder in the rotary material platform drives the product placing platform and the first product carrier on the product placing platform to rotate, the first product carrier on which the lens is placed after rotation is close to a loading module, the first product carrier close to the loading module waits for the loading manipulator to load when the loading module waits for the lens to be removed, and the first product carrier far away from the loading module waits for the material loading, so that the material loading period is shortened.
Further, the specific step of step S6 is: when the positioning sensor detects product positioning data, the first moving module drives the carrying device to move to one side close to the product feeding device, when the carrying device moves to one side of the product feeding device, the second moving module, the rotating device and the third moving module on the carrying device drive and adjust the position of the carrying suction head together to suck the lens on the first product carrier through the carrying suction head, after the product in-place sensor detects product in-place data, the second moving module, the rotating device and the third moving module on the carrying device drive and achieve returning of the carrying suction head together, and after returning is completed, the first moving module drives the carrying device to move to one side close to the second product carrier, and the lens is placed in the second product carrier.
Further, the test value read in step S2 and the test value read in step S7 are both transmitted to the data processing unit in the control system for processing.
Further, the specific step of step S7 is: the lifting device drives the pressing block to move downwards to the position above the product positioning device and continues to move downwards until the pressing block is tightly pressed on the sealing ring; the air input device continuously inputs air into the first ventilation pipeline, the air flows into the hollow part in the lens, passes through the joint of the glass and the metal piece and flows into the test cavity, the air flows through the airflow pipeline and the second ventilation pipeline from the test cavity in sequence and flows to the leakage tester, the leakage tester keeps the type and the test pressure of the leakage tester unchanged after receiving the air for testing, and the control system reads the test value tested by the leakage tester and transmits the test value to the data processing unit.
Further, the threshold in step S8 is a value set manually, and/or a resulting tolerance calculated according to the leakage rate obtained in step S8 for a plurality of lenses; the number of shots may be all shots or randomly selected portions of shots.
Further, the calculation formula of the leakage rate in step S8 is: f (sccm) = (60/101300) × V × Δ P/Δt; 60/101300 is the deformation of the standard atmospheric pressure and time calculation formula, V is the volume V, Δ P is the pressure difference change Δ P, and Δ t is the test time Δ t.
Example two
The present embodiment is performed on the basis of the first embodiment, and the same parts as the first embodiment are not described in detail.
In this embodiment, the pressing block is internally provided with a cavity.
Furthermore, a third vent pipe is provided with a three-way leak hole, the third vent pipe connected to the leak tester is divided into two branches after passing through the three-way leak hole, one branch is communicated with the second vent pipe on the pressing block, and the other branch is communicated with the cavity in the pressing block. Before testing, a branch in the three-way leakage hole, which is communicated with the cavity in the pressing block, needs to be closed, and then testing is carried out; when the test data of camera lens exist unusually, open in the tee bend small opening with cavity in the briquetting carries out the branch road that communicates, close with second vent pipe on the briquetting carries out the branch road that communicates, leak the volume of losing air of the inside cavity of leak tester test briquetting detects second vent pipe and air flow pipeline's kneck, air flow pipeline, second vent pipe and whether there is the gas leakage phenomenon to judge whether to be the data anomaly that second vent pipe and air flow pipeline's kneck, air flow pipeline, second vent pipe gas leakage lead to.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The air tightness detection equipment is characterized by being used for detecting the air tightness between glass and a metal piece in a lens and comprising a case, a product feeding device, a material moving device and a detection device, wherein the product feeding device, the material moving device and the detection device are all arranged above the case;
the detection device comprises a plurality of second product carriers, a plurality of pressing devices and a plurality of leakage testers, the number of the pressing devices is the same as that of the second product carriers, and the pressing devices are arranged above the second product carriers and correspond to the second product carriers one by one;
each second product carrier comprises a positioning device and a plurality of product positioning devices arranged on the positioning device, each product positioning device is of a hollow structure, a product contour hole for embedding a part of lens and a sealing ring placing hole arranged on the periphery of the product contour hole are formed in each product positioning device, the sealing ring placing hole is used for placing a sealing ring, and a plurality of first air ducts communicated with the hollow structure of the product positioning device are arranged on each positioning device;
each pressing device comprises a lifting device, a plurality of pressing blocks arranged on the output end of the lifting device and a second air duct arranged on the pressing blocks, an air flow duct is arranged inside each pressing block and communicated with the second air duct, and the leakage tester is connected with the pressing blocks through a third air duct;
a test cavity is formed among the pressing block, the sealing ring and the lens;
the product feeding device is used for moving the lens from the outside of the air tightness detection equipment to the inside of the air tightness detection equipment;
the material moving device comprises a loading module and an unloading module, the loading module is used for moving the lens from the product loading device to the product contour hole of the second product carrier, and the unloading module is used for moving the lens from the product contour hole to the outside of the air tightness detection device.
2. The air-tightness testing device of claim 1, wherein the first air duct is further connected to an air input device for delivering air from the first air duct to the product positioning device.
3. The airtightness detection apparatus according to claim 1, further comprising a plurality of pressure adjustment devices, wherein each of the pressure adjustment devices is connected with a fourth vent pipe, and the fourth vent pipe communicates the pressure adjustment device with the leakage tester.
4. The airtightness detection apparatus according to claim 1, wherein a cavity is provided inside the pressure block.
5. The airtightness detection apparatus according to claim 4, wherein a three-way leak hole is provided in the third vent pipe, the third vent pipe connected to the leakage tester is divided into two branches after passing through the three-way leak hole, one branch is communicated with the second vent pipe on the pressure block, and the other branch is communicated with the cavity inside the pressure block.
6. The airtightness detection apparatus according to claim 1, wherein the product loading device includes a loading manipulator and a rotary material table, the loading manipulator is connected with a plurality of loading suction heads, the rotary material table includes a rotary cylinder and a product placement table connected to an output end of the rotary cylinder, the product placement table is provided with at least two first product carriers, and each first product carrier is provided with a plurality of first product placement stations therein.
7. The airtightness detection apparatus according to claim 1, wherein the loading module and the unloading module have the same structure, the loading module and the unloading module are placed on the chassis in mirror symmetry with respect to the second product carrier, each of the loading module and the unloading module includes a first moving module and a handling device disposed on the first moving module, the handling device includes a second moving module and a rotating device connected to the second moving module, a third moving module is connected to an output end of the rotating device, and a plurality of handling suction heads are slidably connected to the third moving module.
8. The air tightness detection method is characterized by adopting the air tightness detection device as claimed in claim 1, and comprises the following specific steps:
s1, selecting a standard test block with the same material and the same shape as the lens, placing the standard test block in a product limiting hole in the product positioning device, and placing a sealing ring in the sealing ring placing hole;
s2, the lifting device drives the pressing block to move downwards to the position above the product positioning device and continues to move downwards until the pressing block tightly presses the sealing ring; selecting the type and the test pressure of the leakage tester, and reading a test value;
s3, repeating the steps S1-S2 for at least 10 times, reading the test values one by one, calculating the average value of pressure drop among all the obtained test values to be used as the standard pressure drop value P1 of the leakage hole, inputting the obtained standard pressure drop value P1 of the leakage hole into the leakage tester, calculating the average value of air leakage among all the obtained test values to be used as the standard air leakage value F1, and inputting the obtained standard air leakage value F1 into the leakage tester;
s4, taking out the standard test block in the product limiting hole, and completing the calibration of the leakage tester;
s5, moving the lens from the outside of the air tightness detection equipment to the air tightness detection equipment through the product feeding device;
s6, moving the lens from the product loading device to a product contour hole of the second product carrier through the loading module;
s7, the lifting device drives the pressing block to move downwards to the position above the product positioning device and continues to move downwards until the pressing block tightly presses the sealing ring; keeping the type and the test pressure of the leakage tester unchanged, and reading a test value;
s8, calculating according to the test values obtained in the S7 to obtain a leakage rate;
s9, comparing the leakage rate calculated in the S8 with a threshold value, and judging that the lens is an NG material or an OK material;
s10, moving the lens from the product contour hole of the second product carrier to the outside of the air tightness detection device through the unloading module;
and S11, repeating the steps S5-S10 until all the lenses needing to be detected are detected.
9. The airtightness detection method according to claim 8, wherein the steps S1-S4 are performed under the condition that the airtightness detection apparatus is operated without a lens for at least 3 minutes, and the calibration cycle time of the steps S1-S4 is at least twice during the lifetime of the apparatus.
10. The airtightness detection method according to claim 8, wherein the test values read in step S7 include a volume V, a pressure difference change Δ P, and a test time Δ t, the volume V includes volumes of the leak tester, the first vent pipe, the second vent pipe, the third vent pipe, and the airflow pipe, the pressure difference change Δ P is a pressure change value to which the lens is subjected before and after the test in step S7, a specific value of the pressure difference change Δ P is obtained by subtracting a pressure value after the test of the lens in step S7 from a standard leak hole pressure drop value P1, and a calculation formula of the leak rate in step S8 is: f (sccm) = (60/101300) × V × Δ P/Δt.
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