Gas permeability detection tool and permeability detection device

Abstract

The utility model provides a gas permeability detection tool and a permeability detection device. The gas permeability detection tool comprises a base, a lower supporting table, an upper supporting table and a driving part, wherein the lower supporting table, the upper supporting table and the driving part are arranged on the base; the lower supporting table is provided with a bearing part and a lower ventilation channel, the upper supporting table is provided with a cutter and an upper ventilation channel, one of the upper ventilation channel and the lower ventilation channel is used for being connected with an external air supply device, and the other one of the upper ventilation channel and the lower ventilation channel is used for being connected with a gas detection device. The driving part is connected with the lower supporting table or the upper supporting table, the cutter can be matched with the bearing part to form a closed cavity, a to-be-detected part located in the closed cavity is cut on the to-be-detected piece, and the closed cavity is communicated with an external air supply device and an air detection device. According to the gas permeability detection tool provided by the utility model, the cutter is arranged on the upper supporting table, so that the specifications of the to-be-detected parts of the to-be-detected pieces are the same, the consistency of the to-be-detected pieces in detection is ensured, and the detection precision and the detection efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, and in particular to a gas permeability testing fixture; at the same time, this utility model also relates to a permeability testing device equipped with the gas permeability testing fixture. Background Technology

[0002] Gas permeability testing fixtures are mainly used to test the gas permeability of test components. Their main working principle involves placing the component under test in a sealed space, allowing gas to flow in a single direction through the component. By measuring the inlet and outlet gas parameters, the gas permeability of the test component can be evaluated. Taking the plastic liner of a gas cylinder as an example, the hydrogen permeability performance of the liner material needs to be verified using a gas permeability testing fixture. Furthermore, quantitative analysis is required between liners made of different materials to facilitate material comparison.

[0003] Existing gas permeability testing fixtures require manual cutting of the test piece before use, followed by testing of the cut portion using the fixture. However, the cut dimensions of the test piece are not standardized, resulting in inconsistent dimensions and compromising test piece uniformity. Furthermore, the separate cutting of the test piece before testing lengthens the overall testing cycle, hindering efficiency. Utility Model Content

[0004] In view of this, the present invention aims to provide a gas permeability testing fixture to improve testing efficiency and accuracy.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A gas permeability testing fixture includes a base, a lower support platform, an upper support platform, and a driving unit disposed on the base;

[0007] The lower support platform is provided with a support portion for supporting the test piece, and a lower air passage extending to the support portion. The upper support platform has a cutter corresponding to the support portion, and an upper air passage extending to the cutter. One of the upper air passage and the lower air passage is used to connect to an external gas supply device, and the other is used to connect to a gas detection device.

[0008] The driving unit is connected to the lower support platform or the upper support platform. Under the drive of the driving unit, the cutter can cooperate with the supporting part to form a sealed cavity and cut out the test part located in the sealed cavity on the test piece. The sealed cavity is connected to one of the external air supply device and the gas detection device through the upper air passage and to the other of the external air supply device and the gas detection device through the lower air passage.

[0009] Furthermore, the top of the supporting portion has a recessed groove, and the bottom wall of the recessed groove is provided with a lower vent hole communicating with the lower vent.

[0010] Furthermore, the lower groove is provided with a breathable sheet with vent holes, which can support the part to be tested.

[0011] Furthermore, the bottom wall of the lower groove is provided with a plurality of first ventilation grooves spaced apart circumferentially along the lower ventilation hole, and each first ventilation groove extends radially along the lower ventilation hole.

[0012] Furthermore, the supporting portion protrudes from the lower support platform, and the bottom wall of the lower groove is provided with a plurality of second ventilation grooves arranged radially at intervals along the lower ventilation hole;

[0013] Multiple first ventilation slots are connected through second ventilation slots.

[0014] Furthermore, the bottom end of the cutter has a slot conforming to the support portion, and an upwardly recessed upper groove is provided on the bottom wall of the slot, and an upper vent hole communicating with the upper vent passage is provided on the bottom wall of the upper groove.

[0015] Furthermore, the cutter is provided with an upper sealing ring surrounding the upper groove; and / or,

[0016] The supporting portion is provided with a lower sealing ring surrounding the lower groove.

[0017] Furthermore, the base is provided with an upwardly extending mounting column, and the upper support platform is fixed on the mounting column;

[0018] The drive unit is connected to the lower support platform, and the mounting column passes through the lower support platform to guide the lower support platform to slide up and down.

[0019] Compared with the prior art, this utility model has the following advantages:

[0020] The gas permeability testing fixture of this utility model forms a sealed cavity through the cooperation of a cutter and a support. The cutter places the test part, after cutting the workpiece, within the sealed cavity, allowing the gas from the external gas supply device to flow unidirectionally through the workpiece and into the gas detection device. This facilitates gas permeability testing of the workpiece. Furthermore, placing the cutter on the upper support platform ensures that the test parts of each workpiece are of the same size, thereby ensuring consistency in the testing process and improving testing accuracy. Moreover, the cutter design also solves the problem of long processing time associated with cutting the workpiece individually in existing technologies, thus improving testing efficiency.

[0021] Secondly, the upper and lower grooves and lower vent holes in the supporting part help to increase the ventilation area of ​​the part to be tested, thereby improving the detection accuracy. By setting the vent, not only is the support effect of the part to be tested improved, but the detection area of ​​the part to be tested is not affected. At the same time, the lower groove can also position the vent, thereby ensuring the stability of the vent during use.

[0022] Furthermore, by providing multiple first venting grooves spaced circumferentially on the bottom wall of the lower groove, gas can diffuse from multiple directions around the lower vent, facilitating uniform gas distribution around the bottom wall of the lower groove. Each first venting groove extends radially along the lower vent, increasing the gas coverage area on the bottom wall region and allowing for more thorough contact between the gas and the bottom of the part to be tested, thereby improving detection accuracy. The multiple second venting grooves spaced radially provide more flow paths for the gas along the radial direction of the lower vent in the bottom wall region, and the interconnection of the multiple first venting grooves through the second venting grooves further enhances the uniformity of gas flow to the part to be tested.

[0023] Furthermore, the cylindrical support not only provides excellent support but also boasts a simple structure and ease of implementation. The slot on the cutter mates with the outer periphery of the support, ensuring cutting accuracy and resulting in neater edges on the tested portion. It also enhances the sealing of the enclosed cavity. The upper groove allows gas flowing from the upper vent to pass through to the tested portion, maximizing the ventilation area and improving the accuracy of the penetrability test. The upper sealing ring improves the seal between the cutter and the tested portion, while the lower sealing ring improves the seal between the tested portion and the support, preventing low accuracy due to poor airtightness. The mounting column provides a foundation for the upper support platform and ensures the stability of the lower support platform during sliding. Its simple structure also facilitates easy implementation.

[0024] In addition, another objective of this utility model is to provide a gas permeability detection device, including the gas permeability detection fixture as described above, a gas detection device connected to one of the upper air passage and the lower air passage, and an air inlet pipe connected to the other of the two, the air inlet pipe being used to connect to the external gas supply device.

[0025] Furthermore, it includes a housing, and a display screen and / or console disposed on the housing;

[0026] The housing has a receiving cavity and an operating port communicating with the receiving cavity. The gas permeability detection fixture and the gas detection device are disposed in the receiving cavity. The upper support platform and the lower support platform are disposed corresponding to the operating port.

[0027] Compared with the prior art, this utility model has the following advantages:

[0028] The gas permeability testing device of this invention, by setting the gas permeability testing fixture as described above, helps to improve the efficiency and accuracy of gas permeability testing of the test piece.

[0029] In addition, the housing provides installation space for the gas permeability testing fixture and gas detection device, the display screen facilitates the visualization of important information generated during the operation of the testing fixture and device, the control console facilitates the operator to control the testing fixture and device, and the operation port facilitates the placement and removal of the test piece, and makes it convenient for the operator to operate and monitor. Attached Figure Description

[0030] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0031] Figure 1 This is a schematic diagram of the gas permeability testing fixture described in Embodiment 1 of this utility model from one perspective.

[0032] Figure 2 This is a schematic diagram of the gas permeability testing fixture described in Embodiment 1 of this utility model from another perspective;

[0033] Figure 3 for Figure 2 Sectional view along direction AA in the middle;

[0034] Figure 4 This is a schematic diagram of the lower support platform and the breathable sheet described in Embodiment 1 of this utility model;

[0035] Figure 5This is a schematic diagram of the lower support platform described in Embodiment 1 of this utility model from one perspective.

[0036] Figure 6 This is a schematic diagram of the lower support platform described in Embodiment 1 of this utility model from another perspective;

[0037] Figure 7 for Figure 6 BB-direction sectional view;

[0038] Figure 8 This is a schematic diagram of the supporting part according to Embodiment 1 of this utility model;

[0039] Figure 9 This is a schematic diagram of the upper support platform described in Embodiment 1 of this utility model from one perspective.

[0040] Figure 10 This is a schematic diagram of the upper support platform described in Embodiment 1 of this utility model from another perspective;

[0041] Figure 11 for Figure 10 The sectional view along the CC direction in the middle;

[0042] Figure 12 This is a schematic diagram of the penetrability detection device according to Embodiment 2 of this utility model;

[0043] Figure 13 This is a schematic diagram of the internal structure of the penetrability detection device described in Embodiment 2 of this utility model from one perspective;

[0044] Figure 14 This is a schematic diagram of the internal structure of the penetrability detection device described in Embodiment 2 of this utility model from another perspective.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Base; 2. Upper support platform; 3. Lower support platform; 4. Drive unit; 5. Test piece; 6. Housing; 7. Display screen; 8. Control console; 9. Controller; 10. Gas detection device; 11. Inlet pipe;

[0047] 101. Install the column;

[0048] 200. Upper vent; 201. Cutting blade; 2011. Blade; 202. Upper groove; 203. Upper mounting slot; 204. Upper vent; 205. Upper sealing ring; 206. Slot;

[0049] 300. Lower vent; 301. Supporting part; 3011. Lower groove; 3012. First vent groove; 3013. Second vent groove; 302. Ventilation sheet; 303. Lower mounting groove; 304. Lower vent; 305. Lower sealing ring;

[0050] 501. The part to be tested;

[0051] 601. Operation port;

[0052] 801, Button;

[0053] 901. Wire harness;

[0054] 1001. Exhaust pipe. Detailed Implementation

[0055] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0056] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0057] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0058] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0059] Example 1

[0060] This embodiment relates to a gas permeability testing fixture, which improves the accuracy and efficiency of gas permeability testing of the test piece 5 by optimizing its own structure.

[0061] In terms of overall structure, the gas permeability testing fixture includes a base 1, a lower support platform 3, an upper support platform 2, and a drive unit 4 mounted on the base 1. The lower support platform 3 is provided with a support portion 301 for supporting the test piece 5 and a lower air passage 300. The upper support platform 2 has a cutter 201 corresponding to the support portion 301 and an upper air passage 200. One of the upper air passage 200 and the lower air passage 300 is used to connect to an external gas supply device, and the other is used to connect to a gas detection device 10.

[0062] The drive unit 4 is connected to the lower support platform 3 or the upper support platform 2. Under the drive of the drive unit 4, the cutter 201 can cooperate with the support part 301 to form a sealed cavity and cut out the test part 501 located in the sealed cavity on the test piece 5. The sealed cavity is connected to one of the external air supply device and the gas detection device through the upper air passage 200, and is connected to the other of the external air supply device and the gas detection device through the lower air passage 300.

[0063] The gas permeability testing fixture described in this embodiment forms a sealed cavity through the cooperation of the cutter 201 and the support portion 301. The cutter 201 places the test portion 501 of the sample 5 after cutting it into the sealed cavity, allowing the gas from the external gas supply device to flow unidirectionally through the sample 5 into the gas detection device 10 within the sealed cavity, which is beneficial for gas permeability testing of the sample 5. By placing the cutter 201 on the upper support platform 2, it is beneficial to cut the test portions 501 of each sample 5 into uniform specifications, thereby ensuring the consistency of the sample 5 during testing and improving testing accuracy. In addition, compared with the prior art scheme of cutting the sample 5 separately before testing, it is also beneficial to shorten the testing cycle, thereby improving testing efficiency.

[0064] Based on the above overview, an exemplary structure of the gas permeability detection fixture described in this embodiment is as follows: Figures 1 to 3 As shown in the diagram, to facilitate the arrangement of the upper support platform 2 and the lower support platform 3, the base 1 is provided with an upwardly extending mounting column 101, and the upper support platform 2 is fixed to the mounting column 101. The drive unit 4 is connected to the lower support platform 3, and the mounting column 101 is installed through the lower support platform 3 to guide the lower support platform 3 to slide up and down. The mounting column 101 here not only provides a foundation for the arrangement of the upper support platform 2, but also helps to ensure the stability of the lower support platform 3 during sliding. Moreover, the structure of the mounting column 101 is simple and easy to arrange and implement.

[0065] Specifically, both the upper support platform 2 and the lower support platform 3 are rectangular, and the mounting columns 101 are four spaced apart corresponding to the four corners of the support platforms. The upper support platform 2 is connected to the tops of the four mounting columns 101, and the lower support platform 3 is slidably mounted on the four mounting columns 101 and located below the upper support platform 2. The drive unit 4 is preferably mounted on the base 1 and located below the lower support platform 3, with its power output end connected to the lower support platform 3. In this embodiment, the drive unit 4 can be a motor or cylinder capable of outputting linear driving force.

[0066] As a structural example, the upper vent 200 is connected to an external gas supply device, and the lower vent 300 is connected to a gas detection device 10. Gas flowing from the external gas supply device passes through the upper vent 200, through the test section 501, and then flows into the gas detection device 10 via the lower vent 300. Taking the test component 5 as the inner liner of a gas cylinder as an example, the external gas supply device can be a hydrogen storage tank to fill the upper vent 200 with hydrogen. The gas detection device 10 can specifically be a hydrogen detector to collect and analyze the hydrogen flowing through the test section 501, thereby evaluating the hydrogen permeability of the test component 5.

[0067] It should be noted that in this embodiment, the drive unit 4 can also be connected to the upper support platform 2, and the lower support platform 3 can be fixedly set relative to the base 1. In this case, the cooperation between the lower support platform 3 and the lower support platform 3 can also achieve a good working effect. In addition, the upper air passage 200 can be connected to the gas detection device 10, and the lower air passage 300 can be connected to the external gas supply device. Furthermore, the number and position of the mounting columns 101, as well as the shape of each support platform, can be adaptively adjusted according to the usage requirements.

[0068] As a preferred implementation method, such as Figures 3 to 7 As shown in the figure, in this embodiment, the top of the supporting portion 301 has a recessed groove 3011, and the bottom wall of the groove 3011 is provided with a lower vent hole 304 communicating with the lower vent 300. The arrangement of the upper and lower grooves 3011 of the supporting portion 301 helps to increase the ventilation area of ​​the portion to be tested 501. After the gas flows from bottom to top through the portion to be tested 501, it flows into the gas detection device 10 through the groove 3011 and the lower vent hole 304.

[0069] Reference Figure 6 and Figure 7 As shown, the lower vent 300 extends along the width of the lower support platform 3, and the lower vent 304 is preferably located at the center of the lower groove 3011 and extends vertically. One end of the lower vent 300 communicates with the lower vent 304, and the other end extends through to the side wall of the lower support platform 3. This arrangement facilitates implementation and provides good ventilation.

[0070] like Figure 4As shown, in some embodiments, a ventilated sheet 302 with vent holes is provided in the lower groove 3011, which can support the part to be tested 501. The ventilated sheet 302 is also circular and adapted to the size of the lower groove 3011. By providing the ventilated sheet 302, not only is the support effect of the part to be tested 501 improved, but the detection area of ​​the part to be tested 501 is not affected. At the same time, the lower groove 3011 can also position the ventilated sheet 302, thereby ensuring the stability of the ventilated sheet 302 during use.

[0071] In practical implementation, the venting sheet 302 can be made of, for example, a sintered plate with a large number of evenly distributed venting holes, allowing gas to diffuse through the venting sheet 302 in a relatively uniform manner. Of course, the venting sheet 302 can also be made of other materials with venting holes, as long as the usage requirements are met.

[0072] To improve the uniformity of gas flow at the bottom of the test section 501, as a preferred embodiment, such as... Figure 8 As shown, the bottom wall of the lower groove 3011 is provided with a plurality of first venting grooves 3012 spaced circumferentially along the lower venting hole 304, and each first venting groove 3012 extends radially along the lower venting hole 304. The plurality of first venting grooves 3012 allows gas to flow in a dispersed manner from multiple directions around the lower venting hole 304, facilitating the uniform distribution of gas around the bottom wall of the lower groove 3011.

[0073] In addition, the first ventilation grooves 3012 extend radially along the lower ventilation holes 304, which helps to increase the coverage of gas in the bottom wall area, thereby allowing the gas to make more thorough and uniform contact with the bottom of the part to be tested 501, and avoiding the situation where gas accumulates in a local area and cannot effectively penetrate in other areas.

[0074] Furthermore, the bottom wall of the lower groove 3011 is provided with a plurality of second venting grooves 3013 arranged radially at intervals along the lower venting hole 304, and the plurality of first venting grooves 3012 are connected through the second venting grooves 3013. Preferably, as follows... Figure 8 As shown, the second venting groove 3013 can be multiple grooves arranged at equal angles along the circumference of the lower venting hole 304. By setting the second venting groove 3013, gas can circulate between different first venting grooves 3012 and second venting grooves 3013, which helps to ensure the continuity and stability of gas diffusion in the bottom wall area, thereby improving the uniformity of gas flow at the bottom of the part to be tested 501, and thus improving the detection accuracy of the penetrability detection fixture.

[0075] like Figures 9 to 11As shown in the diagram, in this embodiment, the supporting portion 301 protrudes upward relative to the lower support platform 3. The bottom end of the cutter 201 has a slot 206 conforming to the shape of the supporting portion 301, and an upwardly recessed upper groove 202 is provided on the bottom wall of the slot 206. The bottom wall of the upper groove 202 is provided with an upper vent hole 204 communicating with the upper vent 200. Specifically, the gas flowing into the upper vent 200 flows to the part to be tested 501 through the upper groove 202, thus making the ventilation area of ​​the part to be tested 5 larger and improving the uniformity of the gas.

[0076] In this embodiment, the supporting portion 301 is an upwardly protruding cylinder. The cylindrical shape has the advantages of simple structure and easy arrangement. The cross-section of the lower groove 3011 is a circle coaxially arranged with the supporting portion 301. Of course, in addition to being cylindrical, the supporting portion 301 can also be prismatic or other shapes, as long as it meets the usage requirements.

[0077] Specifically, the slot 206 conforms to the support portion 301, meaning its cross-section is also circular, and the diameter of the slot 206 is equal to the outer diameter of the support portion 301. The upper groove 202 has a circular cross-section coaxially arranged with the slot 206, and the cutting edge 2011 of the cutter 201 is also annular, arranged circumferentially along the opening of the slot 206. The annular cutting edge 2011 can engage with the upper edge of the support portion 301 during insertion, forming a sealed cavity while cutting the workpiece 5 under test. Specifically, after the cutting edge 2011 contacts the moving workpiece 5 under test, it can cut the workpiece 5 under test as the lower support platform 3 continues to move upward, and the diameter of the workpiece 501 under test is the same as the diameter of the support portion 301. The cut-off waste falls onto the lower support platform 3, facilitating the processing of the cut waste.

[0078] In this embodiment, the aforementioned cutter 201's ability to cooperate with the support portion 301 specifically means that the cutting edge 2011 on the cutter 201 can cut the test piece 5 during its descent, and the inner peripheral wall of the slot 206 and the outer peripheral wall of the support portion 301 abut against each other during insertion, thereby facilitating the formation of a sealed cavity. This arrangement, on the one hand, helps ensure the accuracy of the test piece 5 during the cutting process, resulting in a more regular edge of the cut test portion 501; on the other hand, it also helps enhance the sealing performance of the sealed cavity.

[0079] like Figure 11 As shown, the upper vent 200 extends along the width of the upper support platform 2, the upper vent 204 is located at the center of the bottom wall of the upper groove 202 and extends along the vertical direction, one end of the upper vent 200 is connected to the upper vent 204, and the other end is located on the side wall of the upper support platform 2.

[0080] To further improve the detection accuracy of gas permeability testing fixtures, such asFigure 3 As shown, the cutter 201 is provided with an upper sealing ring 205 surrounding the upper groove 202, and the support portion 301 is provided with a lower sealing ring 305 surrounding the lower groove 3011. Specifically, the upper sealing ring 205 is disposed on the bottom wall of the slot 206 and is arranged circumferentially along the upper groove 202 to achieve a seal between the cutter 201 and the portion to be tested 501. To facilitate the arrangement of the upper sealing ring 205, an upper mounting groove 203 is provided on the bottom wall of the slot 206, arranged circumferentially along the upper groove 202. The upper sealing ring 205 is specifically fixed to the upper support platform 2 through the upper mounting groove 203.

[0081] A lower sealing ring 305 is disposed on the support portion 301 and is arranged circumferentially along the lower groove 3011 to achieve a seal between the support portion 301 and the portion to be tested 501. To facilitate the placement of the lower sealing ring 305, a lower mounting groove 303 is provided on the support portion 301, arranged circumferentially along the lower groove 3011. The lower sealing ring 305 is specifically fixed to the support portion 301 through the lower mounting groove 303. The upper sealing ring 205 and the lower sealing ring 305 have the same diameter, and both diameters are smaller than the diameter of the portion to be tested 501, thus defining the detection area of ​​the portion to be tested 501. This facilitates the sealing effect during gas permeation, thereby preventing low detection accuracy due to poor airtightness.

[0082] In this embodiment, as Figure 3 As shown, the gas flowing into the upper vent 200 flows into the upper groove 202 through the upper vent 204, and is blown towards the test part 501 through the upper groove 202. The gas seeping out from the bottom surface of the test part 501 flows through the air permeable sheet 302, and then flows into the lower vent 304 through the first vent groove 3012 and the second vent groove 3013, and finally flows into the gas detection device 10 through the lower vent 300.

[0083] In this embodiment, when using the gas permeability testing fixture, the test piece 5 is first placed on the support part 301, and then the drive unit 4 is activated, causing the lower support platform 3 to move upward. When the blade 2011 of the cutter 201 comes into contact with the test piece 5, as the lower support platform 3 continues to move upward, the blade 2011 can cut the test piece 5 until the lower support platform 3 moves upward into place. At this time, the upper sealing ring 205 and the lower sealing ring 305 are pressed together.

[0084] Next, the external air supply device supplies air into the upper air passage 200. The gas permeates downward through the upper air passage 200, the upper air hole 204 and the upper groove 202 to the part to be tested 501, ensuring that the gas can flow through the part to be tested 501 according to the expected path. The gas that seeps out from the bottom surface of the part to be tested 501 then flows into the lower air hole 304 through the air permeable sheet 302, the first air groove 3012 and the second air groove 3013, and flows into the gas detection device 10 through the lower air passage 300. The gas detection device 10 detects the gas permeability characteristics of the part to be tested 501.

[0085] Furthermore, in this embodiment, the cutter 201 is mounted on the upper support platform 2, which not only facilitates the formation of a sealed cavity but also integrates the function of cutting the test piece 5 into the testing fixture. Compared to the traditional approach that requires separate cutting of the test piece 5, any test piece 5 can be cut to the same specification, improving the consistency of the test piece 5's specifications during testing and reducing the labor intensity of operators, thereby increasing work efficiency. In addition, the drive unit 4 enables automated operation of the fixture, reducing manual intervention and improving the efficiency and accuracy of the testing fixture.

[0086] Example 2

[0087] This embodiment relates to a gas permeability detection device, including the gas permeability detection fixture described in Embodiment 1, a gas detection device 10 connected to one of the upper air passage 200 and the lower air passage 300, and an air inlet pipe 11 connected to the other of the two, the air inlet pipe 11 being used to connect to an external gas supply device.

[0088] In terms of specific structure, an exemplary structure of the gas permeability detection device in this embodiment is as follows: Figures 12 to 14 As shown in the figure. The gas permeability detection device includes a housing 6, a display screen 7 and a control console 8 disposed on the housing 6. The housing 6 has a receiving cavity and an operation port 601 communicating with the receiving cavity. The gas permeability detection fixture and the gas detection device 10 are disposed in the receiving cavity, and the upper support platform 2 and the lower support platform 3 are disposed corresponding to the operation port 601.

[0089] In detail, the opening of the operating port 601 is positioned facing one side of the housing 6, the upper support platform 2 is located at the top of the receiving cavity, and the lower support platform 3 is initially located at the bottom of the receiving cavity. The operating port 601 facilitates the placement and removal of the test piece 5 and also facilitates the observation of the test status of the test piece 5.

[0090] In this embodiment, the display screen 7 is preferably located on one side of the operation port 601. The gas detection device 10 detects the gas flowing through the test section 501 and converts it into data, which is displayed on the display screen 7. The control console 8 is located below the display screen 7 and the operation port 601.

[0091] As a feasible implementation, the control console 8 is provided with a plurality of operation buttons 801. For example, the operation buttons 801 include an up button for controlling the lower support platform 3 to rise, a down button for controlling the lower support platform 3 to fall, an air supply button for controlling the external air supply device to supply air to the upper air passage 200, an air shut-off button for stopping the external air supply device to supply air to the upper air passage 200, an automatic operation button for automatic operation, a manual operation button for manual operation, and an emergency stop button for controlling the emergency stop of the entire device, etc.

[0092] In practical implementation, a controller 9 is also provided inside the housing 6. Each button 801, the drive unit 4, and the external air supply device and gas detection device 10 are all electrically connected to the controller 9 to improve the usability of the control panel 8. For example, the controller 9 is connected to each button 801 via... Figure 13 The multiple wiring harnesses 901 shown are electrically connected respectively. Of course, the function, location, and number of buttons 801 can be determined according to usage requirements. In addition, the gas detection device 10 is preferably mounted on the base 1 and is connected to the outlet of the lower air passage 300 through the gas outlet pipe 1001. Considering the usage requirements of lifting the lower support platform 3, the gas outlet pipe 1001 has multiple spiral sections.

[0093] In this embodiment, the housing 6 provides installation space for the gas permeability testing fixture and the gas detection device 10, the display screen 7 facilitates the visualization of important information generated during the operation of the testing fixture and the detection device, the control console 8 facilitates the operator to control the testing fixture and the detection device, and the operation port 601 facilitates the picking and placing of the test piece 5, thus making it convenient for the operator to operate and monitor.

[0094] The gas permeability testing device described in this embodiment, by setting the gas permeability testing fixture as described above, helps to reduce the workload of the operator when performing gas permeability testing on the test piece 5, and saves the time for the operator to cut the test piece 5, thereby improving the efficiency and accuracy of gas permeability testing on the test piece 5.

[0095] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gas permeability testing fixture, characterized in that: It includes a base (1), a lower support platform (3), an upper support platform (2) and a drive unit (4) disposed on the base (1); The lower support platform (3) is provided with a support portion (301) for supporting the test piece (5) and a lower air passage (300). The upper support platform (2) has a cutter (201) corresponding to the support portion (301) and an upper air passage (200). One of the upper air passage (200) and the lower air passage (300) is used to connect to an external gas supply device, and the other is used to connect to a gas detection device (10). The drive unit (4) is connected to the lower support platform (3) or the upper support platform (2). Under the drive of the drive unit (4), the cutter (201) can cooperate with the support part (301) to form a sealed cavity and cut out the test part (501) located in the sealed cavity on the test piece (5). The sealed cavity is connected to one of the external air supply device and the gas detection device through the upper air passage (200) and to the other of the external air supply device and the gas detection device through the lower air passage (300).

2. The gas permeability testing fixture according to claim 1, characterized in that: The top of the supporting part (301) has a recessed groove (3011), and the bottom wall of the groove (3011) is provided with a lower vent hole (304) that communicates with the lower vent (300).

3. The gas permeability testing fixture according to claim 2, characterized in that: The lower groove (3011) is provided with a breathable sheet (302) with vent holes, and the breathable sheet (302) can support the part to be tested (501).

4. The gas permeability testing fixture according to claim 2, characterized in that: The bottom wall of the lower groove (3011) is provided with a plurality of first ventilation grooves (3012) arranged circumferentially along the lower ventilation hole (304), and each first ventilation groove (3012) extends radially along the lower ventilation hole (304).

5. The gas permeability testing fixture according to claim 4, characterized in that: The bottom wall of the lower groove (3011) is provided with a plurality of second ventilation grooves (3013) arranged radially at intervals along the lower ventilation hole (304); The plurality of first ventilation slots (3012) are connected through the second ventilation slot (3013).

6. The gas permeability testing fixture according to claim 2, characterized in that: The supporting part (301) is convex relative to the lower support platform (3). The bottom end of the cutter (201) has a slot (206) that conforms to the shape of the supporting part (301), and an upper groove (202) that is recessed upward is provided on the bottom wall of the slot (206). The bottom wall of the upper groove (202) is provided with an upper vent hole (204) that communicates with the upper vent (200).

7. The gas permeability testing fixture according to claim 6, characterized in that: The cutter (201) is provided with an upper sealing ring (205) surrounding the upper groove (202); and / or, The supporting portion (301) is provided with a lower sealing ring (305) surrounding the lower groove (3011).

8. The gas permeability testing fixture according to any one of claims 1 to 7, characterized in that: The base (1) is provided with an upwardly extending mounting column (101), and the upper support platform (2) is fixed on the mounting column (101); The drive unit (4) is connected to the lower support platform (3), and the mounting column (101) passes through the lower support platform (3) to guide the lower support platform (3) to slide up and down.

9. A gas permeability detection device, characterized in that: The device includes a gas permeability testing fixture as described in any one of claims 1 to 8, a gas detection device (10) connected to one of the upper air passage (200) and the lower air passage (300), and an air inlet pipe (11) connected to the other of the two, the air inlet pipe (11) being used to connect to the external gas supply device.

10. The gas permeability detection device according to claim 9, characterized in that: Includes a housing (6), and a display screen (7) and / or a console (8) disposed on the housing (6); The housing (6) has a receiving cavity and an operating port (601) communicating with the receiving cavity. The gas permeability detection fixture and the gas detection device (10) are disposed in the receiving cavity. The upper support platform (2) and the lower support platform (3) are disposed corresponding to the operating port (601).

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