CN113188729A - Air tightness test fixture - Google Patents
Air tightness test fixture Download PDFInfo
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- CN113188729A CN113188729A CN202110454017.4A CN202110454017A CN113188729A CN 113188729 A CN113188729 A CN 113188729A CN 202110454017 A CN202110454017 A CN 202110454017A CN 113188729 A CN113188729 A CN 113188729A
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- pressure
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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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- Examining Or Testing Airtightness (AREA)
Abstract
The invention is suitable for the technical field of testing, and provides an air tightness testing jig, which comprises: the pressure maintaining device comprises a platform, a lower die arranged on the platform, an upper die arranged corresponding to the lower die and a pressure maintaining mechanism; the lower die is provided with a high-pressure cavity, a bearing structure for bearing and positioning a product to be tested is arranged in the high-pressure cavity, the high-pressure cavity is provided with an inflation channel, the inflation channel is connected with an inflation device and provided with a first valve and a pressure regulating assembly, and a first air pressure sensor is arranged in the high-pressure cavity; the inner side of the upper die, corresponding to the product to be tested, is provided with a sealing pressure head, the sealing pressure head is used for sealing the inner side of the product to be tested and forming a low-pressure cavity body on the inner side of the product to be tested, a second air pressure sensor is arranged in the low-pressure cavity body, the upper die is further provided with an air leakage channel communicated with the low-pressure cavity body, and the air leakage channel is provided with a second valve.
Description
Technical Field
The invention belongs to the technical field of product testing, and particularly relates to an air tightness testing jig.
Background
In some functional products (such as bracelet) manufacturing and assembling test procedures, the air tightness test is carried out on the assembled components, and defective products are screened out, so that the screening and repairing work of the defective products is completed before finished products.
At present, a common factory can use relatively expensive and high-precision equipment in the market to carry out airtight testing, and the equipment is customized equipment, so that the cost is high, the use and maintenance are complex, and the operation and the use are inconvenient. In addition, in the prior art, a plurality of internal inflation modes are adopted, and the product performance is influenced by too large air pressure, so that irreversible influence is caused on the product.
Therefore, there is a need to solve the above problems.
Disclosure of Invention
The embodiment of the invention provides an air tightness test fixture, aiming at solving the technical problem.
The embodiment of the invention is realized in such a way that the airtight testing jig comprises: the pressure maintaining device comprises a platform, a lower die arranged on the platform, an upper die arranged corresponding to the lower die and a pressure maintaining mechanism, wherein the upper die is connected with the pressure maintaining mechanism;
the lower die is provided with a high-pressure cavity, a bearing structure for bearing and positioning a product to be tested is arranged in the high-pressure cavity, the high-pressure cavity is provided with an inflation channel, the inflation channel is connected with an inflation device and used for inflating the high-pressure cavity to a preset air pressure, the inflation channel is provided with a first valve and a pressure regulating assembly, and a first air pressure sensor is arranged in the high-pressure cavity;
the inner side of the upper die, which corresponds to the product to be tested, is provided with a sealing pressure head, the sealing pressure head is used for sealing the inner side of the product to be tested and forming a low-pressure cavity body on the inner side of the product to be tested, a second air pressure sensor is arranged in the low-pressure cavity body, the upper die is also provided with an air leakage channel communicated with the low-pressure cavity body, and the air leakage channel is provided with a second valve;
and a sealing ring is arranged on the joint surface of the upper die and the lower die to seal the high-pressure cavity, and the first valve and the second valve are closed during pressure maintaining test.
Further, the inflation channel is provided in the upper mold.
Furthermore, the lower die is arranged on the platform through a linear guide rail mechanism, and the linear guide rail mechanism can drive the lower die to move to a test station from a feeding and discharging station of the platform.
Furthermore, a grating detection module is arranged between the feeding and discharging station and the testing station.
Furthermore, the upper die is connected with the pressure maintaining mechanism through a connecting plate, a buffer is arranged at the peripheral edge of the connecting plate, and the buffer is in limit connection with a limit column arranged on the platform.
Furthermore, a stepped pressure head setting groove is formed in the center of the upper die, the sealing pressure head is also of a stepped structure and is arranged in the pressure head setting groove, and the sealing pressure head is tightly pressed in the upper die through a pressing plate.
Further, a section of the blow-by gas passage is located in the platen.
Furthermore, the periphery of the connecting plate is also provided with a plurality of guide posts.
Furthermore, the bearing structure is a carrier which is detachably arranged in the high-pressure cavity.
Still further, the pressure regulating assembly includes a plurality of regulating valves and at least one precision pressure regulating valve.
Compared with the prior art, the jig has the advantages of simple structure and low cost, can realize desktop test, can select defective products in the product assembling process, reduces the number of defective products and reduces the heavy construction time. Screening failures can also reduce heavy work burden and detection pressure for subsequent stations. The precision of tool is improved to the mode that adopts the collection gas pressure, can reach better detection effect, can reach 5 atmospheric pressures at most, that is to say the measurement of 50 meters depth of water (500kpa), reaches application scope and the precision standard that inflatable gas survey tool can't reach. In addition, due to the fact that the high-pressure cavity and the low-pressure cavity are distinguished, external stamping of a product can be achieved, air pressure on the outer side of the product is larger than that on the inner side of the product, the mode is consistent with the actual underwater stress direction, underwater environment can be better simulated, the situation that electronic elements on the inner side of the product are damaged due to overlarge internal air pressure is avoided, and the production yield is improved.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an airtight testing fixture according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram (without a housing) of the hermetic testing fixture according to the embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of the upper and lower molds after closing in accordance with the embodiment of the present invention;
fig. 4 is a schematic view illustrating an operation principle of the air-tightness testing fixture according to the embodiment of the invention.
The reference numbers illustrate:
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1-2, the present invention provides an air-tightness testing fixture, comprising: the pressure maintaining device comprises a platform 100, a lower die 110 arranged on the platform 100, an upper die 120 arranged corresponding to the lower die 110, and a pressure maintaining mechanism 130, wherein the upper die 120 is connected with the pressure maintaining mechanism 130, and the pressure maintaining mechanism 130 is used for driving the upper die and the lower die 110 to be pressed and maintain pressure.
As shown in fig. 3 and 4, in this embodiment, the lower mold 110 is provided with a high-pressure cavity 111, a bearing structure 112 for bearing and positioning a product to be tested is provided in the high-pressure cavity, the high-pressure cavity 111 is provided with an inflation channel 113, the inflation channel 113 is connected with an inflation device through a first air pipe joint 119 and used for inflating the high-pressure cavity 111 to a preset air pressure, the inflation channel 113 is provided with a first valve 114 and a pressure regulating assembly 170, a first air pressure sensor 115 is provided in the high-pressure cavity 111, and the first valve 114 can be arranged on an air pipe connected with the first air pipe joint 119.
In this embodiment, a sealing pressure head 121 is disposed on the inner side of the upper mold 120 corresponding to the product 200 to be tested, the sealing pressure head 121 is configured to seal the inner side of the product 200 to be tested and form a low-pressure cavity 122 on the inner side of the product to be tested, a second air pressure sensor 126 is disposed in the low-pressure cavity 122, the upper mold 120 is further provided with an air leakage channel 123 communicated with the low-pressure cavity 122 and connected to the outside through a second air pipe joint 129, the air leakage channel 123 is provided with a second valve 127, the second valve 127 may be disposed on an air pipe connected to the second air pipe joint 129, and when the second valve 127 is opened, the air leakage channel 123 is communicated to the atmosphere.
In this embodiment, a sealing ring 130 is disposed on a joint surface of the upper mold 120 and the lower mold 110 to seal the high pressure chamber 111, and the first valve and the second valve are closed during pressure maintaining.
In this embodiment, the holding pressure mechanism 130 includes a holding pressure cylinder 131 and a connecting member 132, and the connecting member 132 is used to connect a cylinder rod of the holding pressure cylinder 131 to the upper die 120. The sealing pressure head 121 can be made of a silica gel material, can be in contact with the surface of a product under the action of pressure, and has good sealing performance. The first valve and the second valve can be solenoid valves in this embodiment, and are electrically controlled.
The jig of this embodiment simple structure, with low costs can realize the desktop test to can select the defective products at the equipment product in-process, reduce finished product defective products quantity, reduce heavy industry man-hour. Screening failures can also reduce heavy work burden and detection pressure for subsequent stations. The precision of tool is improved to the mode that adopts the collection gas pressure, can reach better detection effect, can reach 5 atmospheric pressures at most, that is to say the measurement of 50 meters depth of water (500kpa), reaches application scope and the precision standard that inflatable gas survey tool can't reach. In addition, due to the fact that the high-pressure cavity and the low-pressure cavity are distinguished, external stamping of a product can be achieved, air pressure on the outer side of the product is larger than that on the inner side of the product, the mode is consistent with the actual underwater stress direction, underwater environment can be better simulated, the situation that electronic elements on the inner side of the product are damaged due to overlarge internal air pressure is avoided, and the production yield is improved.
In this embodiment, the air inflation channel 113 is disposed in the upper mold 120, so that the air tube is prevented from being pulled when the lower mold 110 moves laterally to load the test product. Of course, the inflation channel 113 may be disposed in the lower mold 110, and it is sufficient that the inflation of the high pressure chamber 111 is realized.
In this embodiment, referring to fig. 1 and 2, the lower mold 110 is disposed on the platform through a linear guide mechanism 140, the linear guide mechanism 140 can drive the lower mold 110 to move from a loading and unloading station of the platform 100 to a testing station, the loading and unloading station is used for loading or unloading a test product, and the testing station is used for testing the test product. Specifically, the linear guide mechanism 140 includes a linear guide 141 disposed on the surface of the platform, a slider 142 disposed on the linear guide 141 and capable of sliding along the linear guide 141, and a first driving cylinder 143 disposed at the lower portion of the platform 100 and connected to the slider 142. The first driving cylinder 143 may be a rodless cylinder, and the lower mold 110 is switched between the loading and unloading station and the testing station by driving the slider 142 to slide on the linear guide rail 141 through the first driving cylinder 143.
As a further improvement of this embodiment, a grating detection module 150 is disposed between the loading and unloading station and the testing station. The raster detection module 150 can prevent an operator from entering a test station area during mold closing, and can perform operations such as braking or retracting when an object is detected to enter.
In this embodiment, the upper mold 120 is connected to the pressure maintaining mechanism 130 through a connecting plate 160, a buffer 161 is disposed at an outer peripheral edge of the connecting plate 160, and the buffer 161 is connected to a limit column 162 disposed on the platform in a limiting manner.
In this embodiment, as shown in fig. 3, a stepped ram setting groove 124 is provided in the center of the upper mold 120, the sealing ram 121 is also of a stepped structure and is disposed in the ram setting groove 124, and the sealing ram 121 is pressed and set in the upper mold 120 by a pressing plate 125. This allows the sealing ram 121 to be inserted from the back side of the upper die 120 opposite the sealing surface, ensuring sealing performance between the sealing ram 121 and the upper die 120. Meanwhile, the sealing pressure head 121 can be disassembled and replaced to adapt to the shapes of different product surfaces.
In this embodiment, a section of the air leakage channel 123 is located in the pressing plate 125, so that the structural space of the pressing plate 125 is fully utilized, the upper die 120 does not need to be too thick, and the desktop of the jig is facilitated.
In this embodiment, the connecting plate 160 is further provided with a plurality of guide posts 163 on the periphery thereof, and the guide posts guide the connecting plate 160, so that the motion balance of the upper die 120 can be ensured, and the pressure uniformity of the sealing ram 121 on the test product can be ensured.
In this embodiment, the carrying structure 112 is a carrier detachably disposed in the high pressure chamber 111. Because the bearing structure 112 is a detachable structure, the fixture in this embodiment can be adapted to different product structures by replacing the bearing structure 112, thereby implementing testing of various products.
In this embodiment, as shown in fig. 1, the pressure regulating assembly 170 includes a plurality of regulating valves 171 and at least one precision pressure regulating valve 172 for precisely regulating the air pressure in the high pressure chamber 111.
In this embodiment, the air tightness testing fixture further includes an alarm device (not shown in the figure), and when the second air pressure sensor 126 reaches a set value during the testing process, the alarm device is triggered to alarm.
Referring to fig. 4, the working principle of the air tightness testing fixture of the present embodiment is as follows:
1. the purpose of the airtight fixture is to construct a high pressure chamber 111 and a low pressure chamber 122, the test product 200 is between the high pressure chamber 111 and the low pressure chamber 122, if the test product 200 leaks, the pressure of the high pressure chamber 111 decreases, and the pressure of the low pressure chamber 122 increases.
2. After the upper mold 120 and the lower mold 110 are moved into position (after mold clamping), both the first valve 114 and the second valve 127 are opened and then inflated. After the inflation is completed, the first valve 114 and the second valve 127 are simultaneously closed. The high pressure chamber 111 is now at a high pressure and the low pressure chamber 122 is at a relatively low pressure. If the test product has an air leakage, the air will flow from the high pressure chamber 111 to the low pressure chamber 122, the air pressure in the high pressure chamber 111 will decrease, the air pressure in the low pressure chamber 122 will increase, and the first air pressure sensor 115 and the second air pressure sensor 126 will detect the air pressures in the two chambers. When the second air pressure sensor reaches a set value, the tool alarm device can be triggered, and the material part is indicated to be bad.
The advantages of this principle are: compared with direct inflation measurement, the inflation error can be reduced. The gas quantity is mainly collected in the collection process, so that the inflation error can be basically eliminated, and the measurement accuracy is improved. In addition, the simulation of external high pressure and internal low pressure is better and safer than the internal stamping mode, and the electronic elements measured in the product are not needed to be damaged under the high-pressure environment.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. An airtight testing jig, comprising: the pressure maintaining device comprises a platform, a lower die arranged on the platform, an upper die arranged corresponding to the lower die and a pressure maintaining mechanism, wherein the upper die is connected with the pressure maintaining mechanism;
the lower die is provided with a high-pressure cavity, a bearing structure for bearing and positioning a product to be tested is arranged in the high-pressure cavity, the high-pressure cavity is provided with an inflation channel, the inflation channel is connected with an inflation device and used for inflating the high-pressure cavity to a preset air pressure, the inflation channel is provided with a first valve and a pressure regulating assembly, and a first air pressure sensor is arranged in the high-pressure cavity;
the inner side of the upper die, which corresponds to the product to be tested, is provided with a sealing pressure head, the sealing pressure head is used for sealing the inner side of the product to be tested and forming a low-pressure cavity body on the inner side of the product to be tested, a second air pressure sensor is arranged in the low-pressure cavity body, the upper die is also provided with an air leakage channel communicated with the low-pressure cavity body, and the air leakage channel is provided with a second valve;
and a sealing ring is arranged on the joint surface of the upper die and the lower die to seal the high-pressure cavity, and the first valve and the second valve are closed during pressure maintaining test.
2. The hermetic test fixture according to claim 1, wherein the air-filling channel is disposed in the upper mold.
3. The hermetic test fixture according to claim 2, wherein the lower mold is disposed on the platform by a linear guide mechanism, and the linear guide mechanism drives the lower mold to move from a loading/unloading station to a testing station of the platform.
4. The automatic cleaning device for the TP front shell assembly of claim 3, wherein a grating detection module is arranged between the loading and unloading station and the testing station.
5. The hermetic test fixture according to claim 1, wherein the upper mold is connected to the pressure maintaining mechanism through a connecting plate, a buffer is disposed at a peripheral edge of the connecting plate, and the buffer is connected to a position limiting pillar disposed on the platform.
6. The airtightness test fixture according to claim 1, wherein a stepped indenter installation groove is provided in a center of the upper mold, the sealing indenter is also of a stepped structure and is installed in the indenter installation groove, and the sealing indenter is pressed and installed in the upper mold by a pressing plate.
7. The hermetic test fixture according to claim 6, wherein a section of the air leakage channel is located in the press plate.
8. The air tightness testing jig according to claim 6, wherein a plurality of guide posts are further provided on the outer periphery of the connection plate.
9. The hermetic test fixture according to claim 1, wherein the supporting structure is a detachable carrier disposed in the high pressure chamber.
10. The hermetic test fixture according to claim 1, wherein the pressure regulating assembly comprises a plurality of regulating valves and at least one precision pressure regulating valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110454017.4A CN113188729A (en) | 2021-04-26 | 2021-04-26 | Air tightness test fixture |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110454017.4A CN113188729A (en) | 2021-04-26 | 2021-04-26 | Air tightness test fixture |
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| CN113188729A true CN113188729A (en) | 2021-07-30 |
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| CN202110454017.4A Pending CN113188729A (en) | 2021-04-26 | 2021-04-26 | Air tightness test fixture |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114323464A (en) * | 2022-03-08 | 2022-04-12 | 浙江工业大学 | BOSS structure sealing experimental device, system and testing method for IV-type hydrogen storage cylinder |
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2021
- 2021-04-26 CN CN202110454017.4A patent/CN113188729A/en active Pending
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| CN107796562A (en) * | 2016-08-31 | 2018-03-13 | 北京环鼎科技有限责任公司 | One kind is used for plug overpressure resistance detecting device |
| CN110220652A (en) * | 2019-06-24 | 2019-09-10 | 吴忠仪表有限责任公司 | Deep-sea gate valve seat sealing reliability dynamic simulant test device |
| CN210513559U (en) * | 2019-11-11 | 2020-05-12 | 昆山泽旭自动化科技有限公司 | Air tightness test equipment |
| CN111090288A (en) * | 2020-01-20 | 2020-05-01 | 中国工程物理研究院总体工程研究所 | Deepwater compression molding simulation test device and test method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114323464A (en) * | 2022-03-08 | 2022-04-12 | 浙江工业大学 | BOSS structure sealing experimental device, system and testing method for IV-type hydrogen storage cylinder |
| CN114323464B (en) * | 2022-03-08 | 2022-05-27 | 浙江工业大学 | BOSS structure sealing experimental device, system and testing method for IV-type hydrogen storage cylinder |
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Application publication date: 20210730 |