Atmosphere protection device for high-temperature test

Abstract

The utility model belongs to the technical field of material high-temperature mechanical property testing equipment, and particularly relates to an atmosphere protection device for high-temperature testing, which is detachably connected with a universal testing machine and comprises a quartz tube and an end sealing structure in sealing fit with the end part of the quartz tube, and the end sealing structure is in sliding sealing fit with a pull rod of the universal testing machine; the end sealing structure comprises a first sealing structure and a second sealing structure, the outer side wall of the end part of the quartz tube is hermetically sealed by utilizing the first sealing structure, the pull rod of the universal testing machine is in sliding sealing fit by utilizing the second sealing structure, and a corresponding testing atmosphere is provided for the quartz tube through a gas inlet / outlet pipeline connected to the end sealing structure; the high-temperature test requirements of the to-be-tested sample in different atmospheres are met. The atmosphere protection device is simple in structure, easy to disassemble, assemble and use and suitable for performing high-temperature tests on the to-be-tested sample in different atmospheres at low cost in a laboratory.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-temperature mechanical property testing equipment for materials, and specifically relates to an atmosphere protection device for high-temperature testing. Background Technique

[0002] With the rapid development of new materials, new materials such as composite materials, fiber-reinforced materials, ceramic composite materials, and metal composite materials are widely used in important fields such as transportation, new energy, electric power, and aerospace. The application environment of new materials is more complex, and the requirements for the mechanical properties of new materials are higher. Therefore, it is urgent to improve and perfect the material mechanical property testing system to simulate the mechanical properties of new materials under different atmospheres and temperatures, which is of great significance for comprehensively understanding the properties of new materials and the development and application of new materials.

[0003] A universal testing machine is a testing device widely used in the fields of material mechanics, mechanical manufacturing, quality control, etc., and is used to perform various forms of mechanical property tests on materials such as tensile, compression, bending, shear, and tear to evaluate the mechanical properties and durability of materials; by matching different furnace bodies, the performance of materials can be tested in the temperature range from -100°C to 2800°C. Among them, when the test temperature is below 1600°C, the mechanical property tests can be carried out in air atmosphere, vacuum and inert atmosphere, and when the test temperature is higher than 1600°C, the mechanical property tests can be carried out in vacuum or inert atmosphere. By matching different protective atmospheres, the performance tests of materials under high temperature / complex loads can be simulated.

[0004] At present, for high-temperature vacuum or inert atmosphere testing environments, a universal testing machine usually needs to be equipped with a vacuum furnace. Since the supporting high-temperature vacuum furnace device is expensive, the testing cost is high and the testing time is long, it is costly for most scientific research tests in the research stage. Therefore, it is necessary to develop a detachable and easy-to-assemble atmosphere protection device with low cost and adaptable to existing universal testing machines, which is of great significance for reducing the cost of high-temperature material testing. Content of the Utility Model

[0005] In view of the problem that the vacuum furnace device required for existing universal testing machines during high-temperature vacuum or inert atmosphere testing is expensive, resulting in high testing costs, the purpose of this application is to provide a high-temperature testing atmosphere protection device adapted to existing universal testing machines. By designing a quartz tube and a sealing end structure that is hermetically sealed with both ends of the quartz tube and slidably sealed with the pull rod of the universal testing machine, the quartz tube provides the required sealed atmosphere environment for the sample to be tested. Combining with the heating furnace of the universal testing machine to provide a high-temperature environment for the sample to be tested, thus realizing the mechanical property testing of materials under a high-temperature inert atmosphere. The atmosphere protection device of this application can not only be adapted to existing universal testing machines, but also has a simple structure, low cost, is detachable, easy to assemble and use, and can meet the testing requirements of materials under different atmospheres by connecting to different atmospheres.

[0006] Based on the above purpose, the technical solution adopted by the present utility model is as follows:

[0007] An atmosphere protection device for high-temperature testing, which is detachably connected to a universal testing machine, includes a quartz tube and a sealing end structure hermetically sealed with the end of the quartz tube. The sealing end structure is slidably sealed with the pull rod of the universal testing machine; the sealing end structure includes a first flange sleeved on the quartz tube, a second flange tightly fixed to the first flange, and a flange cover tightly fixed to the second flange;

[0008] A first sealing member is provided between the first flange and the quartz tube. The first flange, the first sealing member and the second flange form a first sealing structure, and the first sealing structure seals the end of the quartz tube;

[0009] A second sealing member is provided between the second flange and the pull rod. The second flange, the second sealing member and the flange cover form a second sealing structure, and the second sealing structure is slidably sealed with the pull rod of the universal testing machine;

[0010] A gas inlet and outlet pipeline is connected to the second flange, and the gas inlet and outlet pipeline is communicated with the quartz tube.

[0011] During the high-temperature testing process, the testing temperature inside the quartz tube can reach up to 1200 °C. Therefore, conventional airtight components for directly sealing the ends of quartz tubes are difficult to achieve airtight sealing at high temperatures. The atmosphere protection device of this application, through the design of the sealing end structure, uses the first sealing structure and the second sealing structure to respectively achieve airtight sealing of the outer side wall of the end of the quartz tube and sliding sealing of the pull rod. While the sealing end structure seals the end of the quartz tube airtightly, it also realizes sliding sealing cooperation with the pull rod of the universal testing machine. By connecting the gas inlet and outlet pipeline, the corresponding testing atmosphere is provided inside the quartz tube to meet the high-temperature testing requirements of the sample to be tested under different atmospheres. The atmosphere protection device of this application has a simple structure, is easy to disassemble and assemble, and is suitable for low-cost high-temperature testing of samples to be tested under different atmospheres in the laboratory.

[0012] Furthermore, an annular baffle is provided on the inner wall of the bottom of the first flange, and the annular baffle and the first flange are of an integrated structure;

[0013] The second flange includes an integrally connected lower ring plate, a support ring plate, and an upper ring plate; the lower ring plate, the support ring plate, and the upper ring plate are coaxially arranged;

[0014] The support ring plate is detachably connected to the first flange; the upper ring plate is in threaded fit with the flange cover.

[0015] An annular baffle is provided at the bottom of the first flange for supporting the first seal, so that through the extrusion of the bottom of the lower ring plate of the second flange against the top of the first seal, combined with the inner wall of the first flange, the side wall of the end of the quartz tube can be pressed and sealed.

[0016] The first flange, the second flange, and the flange cover are all detachably connected, which is convenient for assembly, use, and disassembly at the end of the quartz tube, improving the convenience of use of the atmosphere protection device of the present application.

[0017] Furthermore, the lower ring plate is in clearance fit with the quartz tube, and the upper ring plate is in clearance fit with the pull rod; the radial dimension of the lower ring plate is larger than that of the upper ring plate; vent holes are provided on the support ring plate, and the vent holes are communicated with the lower ring plate; the vent holes are communicated with the gas inlet and outlet pipelines.

[0018] During assembly and use, the lower ring plate of the second flange is sleeved outside the quartz tube and is used to seal the side surface of the end of the quartz tube in cooperation with the first flange; the pull rod passes through the upper ring plate, and the pull rod is slidably sealed through the cooperation of the upper ring plate and the flange cover.

[0019] Vent holes communicating with the gas inlet and outlet pipelines are provided on the support ring plate for providing a corresponding test gas atmosphere into the sealed quartz tube.

[0020] Furthermore, an annular groove matching with the quartz tube is also provided at the bottom of the support ring plate.

[0021] An annular groove is provided at the bottom of the support ring plate for limiting the end of the quartz tube, improving the stability of the quartz tube during assembly and use.

[0022] Furthermore, the first seal is sleeved on the outer wall of the quartz tube. When the first flange and the second flange are tightly fixed, the bottom end and the top end of the first seal are respectively in close contact with the annular baffle of the first flange and the bottom of the lower ring plate of the second flange; the inner and outer side walls of the first seal are in contact and sealed cooperation with the inner wall of the first flange and the outer wall of the quartz tube.

[0023] The annular baffle of the first flange and the lower ring plate of the second flange squeeze and fix the upper and lower end faces of the first seal. At the same time, the inner wall of the first flange squeezes the outer side wall of the first seal, and the first seal sleeved on the outer wall of the quartz tube achieves the purpose of gas sealing the outer side wall of the quartz tube.

[0024] This application adopts a structural design method for gas sealing the side wall of the quartz tube, effectively avoiding the problems of high heat resistance requirements for the sealing material when directly sealing the end of the quartz tube and the difficulty of achieving gas sealing due to different deformations of the sealing material at different test temperatures.

[0025] Further, the second seal is sleeved on the outer wall of the pull rod. When the flange cover is fixedly matched with the upper ring plate of the second flange, the bottom end and the top end of the second seal are respectively in close contact with the inner bottom of the upper ring plate and the bottom of the flange cover; the inner and outer side walls of the second seal are respectively in sealing contact with the upper ring plate and the pull rod.

[0026] This application uses the flange cover and the upper ring plate to squeeze and limit and fix the upper and lower end faces of the second seal placed in the upper ring plate, and then uses the inner wall of the upper ring plate to squeeze the outer side wall of the second seal. The second seal sleeved on the outer wall of the pull rod achieves the purpose of sliding sealing the pull rod.

[0027] Further, both the first seal and the second seal include a rubber sealing washer and a stainless steel sealing washer; the rubber sealing washers and the stainless steel sealing washers are arranged alternately.

[0028] Both the first seal and the second seal are composed of alternately arranged rubber sealing washers and stainless steel sealing washers. On the one hand, because this case adopts a side wall sealing method, the alternating sealing of the two washers can increase the height of the seal and improve the sealing effect; on the other hand, in addition to supporting the rubber sealing washer, the stainless steel sealing washer also has a heat conduction effect, which can cooperate with the cooling structures provided on the first flange and the second flange to cool the rubber density washer, reduce the temperature of the rubber sealing washer during high-temperature testing, avoid premature high-temperature aging failure, and extend its service life and sealing effect.

[0029] Further, the longitudinal section of the stainless steel sealing washer is trapezoidal, and the longitudinal length of the outer wall of the stainless steel sealing washer is greater than the longitudinal length of its inner wall.

[0030] The longitudinal section of the stainless steel sealing washer adopts a structure that gradually narrows from the outside to the inside. While supporting the rubber sealing washer, it exerts an inward extrusion on the rubber sealing washer, enhancing the contact tightness between the rubber sealing washer and the outer side wall of the quartz tube or the pull rod, thereby enhancing the gas sealing effect on the end of the quartz tube or the pull rod.

[0031] Furthermore, a cooling structure is provided on the end sealing structure, and the cooling structure includes a first water inlet pipe and a first water outlet pipe provided on the first flange, and a second water inlet pipe and a second water outlet pipe provided on the second flange; the side walls of the first flange and the second flange are both hollow structures.

[0032] Furthermore, the first water inlet pipe and the second water inlet pipe of the cooling structure are respectively connected to the cooling liquid, and the cooling liquid flows out through the first drainage pipe and the second drainage pipe to circulate and cool the first flange and the second flange.

[0033] Adding a cooling structure to the sealing structure can, on the one hand, cool down the sealing material inside the sealing structure that is not resistant to high temperatures, extend its service life, and maintain a good airtight effect; on the other hand, when the subsequent material is replaced for high-temperature testing after the previous material test is completed, it can avoid high-temperature burns to the experimental operators, facilitate the disassembly and installation of the atmosphere protection device in this case, and shorten the waiting time for the next sample test.

[0034] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0035] The atmosphere protection device of the present application is detachably connected to the existing universal testing machine. Through the design of the end-sealing structure, the first sealing structure is used to realize the air-tight sealing of the outer wall of the end of the quartz tube, and the second sealing structure is used to realize the sliding sealing cooperation of the pull rod of the universal testing machine. Through the gas inlet and outlet pipelines connected to the end-sealing structure, the corresponding test atmosphere is provided in the quartz tube to meet the high-temperature testing requirements of the samples to be tested in different atmospheres. The atmosphere protection device of the present application has a simple structure and is easy to disassemble and use. It is suitable for the laboratory to conduct high-temperature testing of the samples to be tested in different atmospheres at a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the overall structure of the atmosphere protection device of Example 1;

[0037] Figure 2 This is the assembly and use status diagram of the atmosphere protection device on the universal testing machine;

[0038] Figure 3 This is a diagram of the end-capping structure of Example 1;

[0039] Figure 4 The front view and cross-sectional view of the matching state of the end-sealing structure, the pull rod and the quartz tube in Example 1;

[0040] Figure 5 An exploded view of the matching state of the end-sealing structure, the tie rod and the quartz tube in Example 1;

[0041] Figure 6 is a schematic structural diagram of the first flange;

[0042] Figure 7Front view and sectional view of the first flange;

[0043] Figure 8 Schematic structural diagram of the second flange;

[0044] Figure 9 Front view and sectional view of the second flange;

[0045] Figure 10 Three-dimensional structural diagram of the stainless steel sealing gasket;

[0046] Figure 11 Front view and sectional view of the stainless steel sealing gasket;

[0047] Figure 12 Test shape and dimensional requirement diagram of the sample to be tested.

[0048] Drawing reference numerals and identifications: 1. Quartz tube; 2. Pull rod; 3. First flange; 301. Ring baffle; 302. First water inlet pipe; 303. First water outlet pipe; 4. Second flange; 401. Lower ring plate; 402. Support ring plate; 4021. Vent hole; 4022. Annular groove; 403. Upper ring plate; 404. Second water inlet pipe; 405. Second water outlet pipe; 5. Flange cover; 6. First seal; 7. Second seal; 8. Gas inlet and outlet pipeline; 9. Rubber sealing gasket; 10. Stainless steel sealing gasket. Detailed implementation manners

[0049] To better illustrate the purpose, technical solution and advantages of the present application, the present application will be further described below in conjunction with specific embodiments. Those skilled in the art should understand that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. Embodiment 1

[0050] This embodiment provides an atmosphere protection device for high-temperature testing. As shown in Figure 1 , its usage state diagram on a universal testing machine is as shown in Figure 2 . The atmosphere protection device is detachably connected to the universal testing machine and includes a quartz tube 1 and two end-sealing structures that are respectively hermetically fitted with the upper and lower ends of the quartz tube 1. The two ends of the quartz tube 1 are hermetically sealed by the end-sealing structures. The end-sealing structures are slidably and hermetically fitted with the pull rod 2 of the universal testing machine, and a gas inlet and outlet pipeline 8 is connected to the end-sealing structures. The gas inlet and outlet pipeline 8 is communicated with the quartz tube 1.

[0051] During use, one end of the upper and lower pull rods 2 of the universal testing machine is connected to a fixture, and the other end clamps the sample to be tested. The sample clamping end of the pull rod 2 passes through the end-sealing structure and extends into the quartz tube 1, and a test atmosphere environment is provided for the inside of the quartz tube 1 through the gas inlet and outlet pipeline 8 connected to the end-sealing structure, so as to perform high-temperature tests on the clamped sample under different atmospheres.

[0052] Among them, the quartz tube 1 is required to withstand a temperature of at least 1000 °C, with a maximum pressure < 0.1 MPa. Its outer diameter is 85 mm, inner diameter is 75 mm, and length is 70 cm.

[0053] The structures of the two end-sealing structures that are hermetically fitted with the upper and lower ends of the quartz tube 1 are exactly the same, and their structures are as Figures 3 - 5 shown, Figure 3 which is a schematic diagram of the assembled structure of each component in the end-sealing structure, Figure 4 which is a front view and a schematic sectional structure diagram of the mating state of the end-sealing structure with the pull rod and the quartz tube, Figure 5 which is an exploded view of the mating state of the end-sealing structure with the pull rod and the quartz tube. The end-sealing structure includes a first flange 3 sleeved on the quartz tube 1, a second flange 4 tightly fixed to the first flange 3, and a flange cover 5 tightly fixed to the second flange 4; a first seal 6 is provided between the first flange 3 and the quartz tube 1, and the first flange 3, the first seal 6 and the second flange 4 form a first sealing structure, which seals the end of the quartz tube 1; a second seal 7 is provided between the second flange 4 and the pull rod 2, and the second flange 4, the second seal 7 and the flange cover 5 form a second sealing structure, which is slidably and hermetically fitted with the pull rod 2 of the universal testing machine.

[0054] The first sealing structure and the second sealing structure are respectively used to achieve airtight sealing of the outer side wall of the end of the quartz tube 1 and sliding sealing of the pull rod 2, so that the end-sealing structure can achieve airtight sealing of the end of the quartz tube 1 while achieving sliding sealing cooperation with the pull rod 2 of the universal testing machine.

[0055] A gas inlet and outlet pipeline 8 is connected to the second flange 4, and the gas inlet and outlet pipeline 8 is connected to the quartz tube 1. For the convenience of controlling the gas pressure and gas flow rate in the quartz tube 1, a micro-pressure pressure gauge, a gas flow meter and a pressure relief valve can be connected to the gas inlet and outlet pipeline 8, and the micro-pressure pressure gauge can accurately identify pressure changes less than 0.1 MPa. By connecting the gas inlet and outlet pipeline 8, a corresponding test atmosphere is provided for the quartz tube 1 to meet the high-temperature test requirements of the sample to be tested under different atmospheres. In the actual detection process, the gas inlet and outlet pipelines at both ends of the quartz tube are respectively an inlet pipeline or an outlet pipeline, which are used to continuously introduce the detection required atmosphere into the quartz tube to discharge other atmospheres. According to the specific gravity of the actual atmosphere relative to air, the lower end of the quartz tube is selected as the air inlet or the upper end as the air inlet, and the opposite end is used as the exhaust port.

[0056] Among them, the structure of the first flange 3 is as Figures 6 - 7 shown, Figure 6 which is a three-dimensional structure diagram of the first flange 3, Figure 7Front view and sectional view of the first flange 3; an annular baffle 301 is provided on the inner wall of the bottom of the first flange 3, and the annular baffle 301 and the first flange 3 are of an integrated structure. An annular baffle 301 is provided at the bottom of the first flange 3 for supporting the first seal 6, so that through the extrusion of the bottom of the lower ring plate 401 of the second flange 4 against the top of the first seal 6, combined with the inner wall of the first flange 3, the side wall of the end of the quartz tube 1 is pressed and sealed.

[0057] The structure of the second flange 4 is as Figures 8 - 9 shown, Figure 8 which is a schematic three-dimensional structure diagram of the second flange 4; Figure 9 Front view and sectional view of the second flange 4; the second flange 4 includes an integrally connected lower ring plate 401, a support ring plate 402 and an upper ring plate 403; the lower ring plate 401, the support ring plate 402 and the upper ring plate 403 are coaxially arranged; the support ring plate 402 is detachably connected to the first flange 3; the upper ring plate 403 is in threaded cooperation with the flange cover 5. The lower ring plate 401 is in clearance fit with the quartz tube 1, and the upper ring plate 403 is in clearance fit with the pull rod 2; the radial dimensions of the lower ring plate 401 and the upper ring plate 403 respectively match the quartz tube 1 and the pull rod 2.

[0058] Vent holes 4021 are provided on the support ring plate 402, and the vent holes 4021 communicate with the lower ring plate 401 and are connected to the gas inlet and outlet pipeline 8 for providing a corresponding test gas atmosphere into the sealed quartz tube 1. An annular groove 4022 matching the quartz tube 1 is also provided at the bottom of the support ring plate 402 for limiting the end of the quartz tube 1 and improving the stability of the quartz tube 1 during assembly and use.

[0059] The first flange 3, the second flange 4 and the flange cover 5 are all detachably connected. Among them, the first flange 3 and the second flange 4 are fixed by bolts and nuts. The inner wall of the upper ring plate 403 of the second flange 4 is provided with internal threads and is in threaded cooperation with the external threads on the flange cover 5 for fixing. The first flange 3, the second flange 4 and the flange cover 5 are detachably connected to facilitate assembly, use and disassembly at the end of the quartz tube 1, improving the convenience of use of the atmosphere protection device of the present application. During assembly and use, the lower ring plate 401 of the second flange 4 is sleeved outside the quartz tube 1 and is used to seal the side of the end of the quartz tube 1 in cooperation with the first flange 3; the pull rod 2 passes through the upper ring plate 403, and the pull rod 2 is slidably sealed through the cooperation of the upper ring plate 403 and the flange cover 5.

[0060] Both the first seal 6 and the second seal 7 are composed of a plurality of alternately arranged rubber sealing washers 9 and stainless steel sealing washers 10, as Figure 5As shown in the figure, the first seal 6 is sleeved on the outer wall of the quartz tube 1. When the first flange 3 is tightly fixed to the second flange 4, the bottom end and the top end of the first seal 6 are respectively in close contact with the circular baffle 301 of the first flange 3 and the bottom of the lower ring plate 401 of the second flange 4. The inner and outer side walls of the first seal 6 are respectively in contact and sealed cooperation with the inner wall of the first flange 3 and the outer wall of the quartz tube 1. The circular baffle 301 of the first flange 3 and the lower ring plate 401 of the second flange 4 squeeze and fix the upper and lower end faces of the first seal 6. At the same time, the inner wall of the first flange 3 squeezes the outer side wall of the first seal 6. By means of the first seal 6 sleeved on the outer wall of the quartz tube 1, the purpose of gas sealing the outer side wall of the quartz tube 1 is achieved. The present application adopts a structural design method for gas sealing the side wall of the quartz tube 1, effectively avoiding the problems of high heat resistance requirements for the sealing material when directly sealing the end of the quartz tube 1 and the difficulty in achieving gas sealing due to different deformations of the sealing material at different test temperatures.

[0061] The second seal 7 is sleeved on the outer wall of the pull rod 2. When the flange cover 5 is fixedly fitted with the upper ring plate 403 of the second flange 4, the bottom end and the top end of the second seal 7 are respectively in close contact with the inner bottom of the upper ring plate 403 and the bottom of the flange cover 5. The inner and outer side walls of the second seal 7 are respectively in contact and sealed cooperation with the upper ring plate 403 and the pull rod 2. The present application uses the flange cover 5 and the upper ring plate 403 to squeeze and limit and fix the upper and lower end faces of the second seal 7 placed inside the upper ring plate 403, and then uses the inner wall of the upper ring plate 403 to squeeze the outer side wall of the second seal 7. By means of the second seal 7 sleeved on the outer wall of the pull rod 2, the purpose of sliding sealing the pull rod 2 is achieved.

[0062] Since the side wall sealing method is adopted in this case and the two washers are alternately sealed, on the one hand, the sealing effect can be improved by adjusting the height of the seal. On the other hand, in addition to supporting the rubber seal washer 9, the stainless steel seal washer 10 also has a heat conduction effect, and can cooperate with the cooling structures provided on the first flange 3 and the second flange 4 to cool the rubber density washer, reduce the temperature of the rubber seal washer 9 during the high-temperature test, avoid premature high-temperature aging failure, and extend its service life and sealing effect.

[0063] The structure of the stainless steel seal washer 10 is as Figures 10 - 11 shown. Its longitudinal section is trapezoidal, and the longitudinal length of the outer wall of the stainless steel seal washer 10 is greater than the longitudinal length of its inner wall. The longitudinal section of the stainless steel seal washer 10 adopts a structure that gradually decreases from the outside to the inside. While supporting the rubber seal washer 9, it generates an inward extrusion on the rubber seal washer 9, enhancing the contact tightness between the rubber seal washer 9 and the outer side wall of the quartz tube 1 or the pull rod 2, thereby enhancing the gas sealing effect on the end of the quartz tube 1 or the pull rod 2.

[0064] In addition, a cooling structure is provided on the end-sealing structure. The cooling structure can adopt a water-cooling device. The cooling structure includes a first water inlet pipe 302 and a first water outlet pipe 303 provided on the first flange 3, a second water inlet pipe 404 and a second water outlet pipe 405 provided on the second flange 4, as well as a cooling water storage tank, a motor, a water pump, etc. connected to each water inlet and outlet pipe. The side walls of the first flange 3 and the second flange 4 are both hollow structures. The first water inlet pipe 302 and the second water inlet pipe 404 of the cooling structure are respectively externally connected to the coolant and flow out through the first drain pipe and the second drain pipe to circulate and cool the first flange 3 and the second flange 4.

[0065] Adding a cooling structure to the end-sealing structure can, on the one hand, cool the heat-intolerant sealing material inside the end-sealing structure, extend its service life, and maintain a good airtight effect; on the other hand, when replacing the subsequent material for high-temperature testing after the previous material test is completed, it can prevent high-temperature burns to the experimental operators, facilitate the disassembly and installation of the atmosphere protection device in this case, and shorten the waiting time for the next sample test.

[0066] The specific usage steps of this device are as follows:

[0067] S1: First, assemble the end-sealing structure. Taking the installation of the end-sealing device at the upper end of the quartz tube 1 as an example for illustration, the installation method of the end-sealing device at the lower end of the quartz tube 1 is the same as that at the upper end and will not be elaborated here. Put the first flange 3 on the quartz tube 1, and then alternately put on the top of the quartz tube 1 in the order of the rubber sealing washer 9 and the stainless steel sealing washer 10. Put the second flange 4 on the quartz tube 1, and then use bolts and nuts to fix the first flange 3 and the second flange 4; subsequently, alternately lay the rubber sealing washer 9 and the stainless steel sealing washer 10 in the upper ring plate 403 of the second flange 4, screw the flange cover 5 onto the upper ring plate 403 of the second flange 4, and then insert the pull rod 2 into the quartz tube 1 through the flange cover 5, the second flange 4, and the first flange 3.

[0068] Or adopt the following installation method: Put the first flange 3 on the quartz tube 1, alternately put on the top of the quartz tube 1 in the order of the rubber sealing washer 9 and the stainless steel sealing washer 10. Subsequently, alternately lay the rubber sealing washer 9 and the stainless steel sealing washer 10 in the upper ring plate 403 of the second flange 4, screw the flange cover 5 onto the upper ring plate 403 of the second flange 4, and then pass the pull rod 2 through the flange cover 5 and the second flange 4. After clamping the end of the pull rod 2 passing through the second flange 4 with a sample, put the second flange 4 on the quartz tube 1, and then use bolts and nuts to fix the first flange 3 and the second flange 4 to complete the sealing and fixing of the end-sealing structure at the upper end of the quartz tube 1.

[0069] S2: Install another set of end-sealing structure at the lower end of the quartz tube 1 according to the method in step S1, which will not be elaborated here.

[0070] S3: Hang the assembled upper and lower pull rods 2 on the universal testing machine.

[0071] S4: Assemble the gas inlet and outlet pipelines 8, micro-pressure gauges, gas flow meters and pressure relief valves, and connect the inlet and outlet water pipes, cooling water storage tanks, motors, water pumps, etc. After the gas circuit and cooling water circuit are both connected, turn on the cooling circulation device and check the sealing performance.

[0072] S5: After the above steps are completed, close the high-temperature furnace and seal the opening position with asbestos; run with an empty sample, heat up to 200 °C, adjust the gas flow rate while heating up, and ensure that the temperature difference between the upper, middle and lower parts in the quartz tube 1 ≤ 20 °C. At this time, a gas flow rate data is obtained.

[0073] S6: According to the gas flow rate data obtained in S5, heat up to 500 °C and 800 °C respectively for verification. After passing the verification, conduct sample tests. Example 2

[0074] This example provides a method for sample testing using the atmosphere protection device of Example 1. The specific steps are as follows:

[0075] Prepare 5 samples of each of 2 metal materials (430F stainless steel, 7075 aluminum alloy) plates according to the GB / T-228.2 metal high-temperature test standard. The size diagrams of the samples are as Figure 12 shown, and conduct high-temperature atmosphere protection tests. The main characterization data are the tensile fracture strength and the elongation after fracture, and compare with the sample test results of the supporting vacuum furnace to analyze the difference rate.

[0076] According to the shape of the sample, install the tensile fixture and the sample; after combining the tensile fixture and the sample, insert the end part along one end into the quartz tube 1, and then install the sealing structures at the upper and lower ends of the quartz tube 1 respectively with reference to the usage method of Example 1. After the above steps are completed, hang the overall component composed of the tensile fixture, the sealing structure and the quartz tube 1 on the universal testing machine; close the high-temperature furnace door and tightly plug the opening position with heat-insulating cotton; set the temperature and test program, turn on the argon gas circuit and adjust the gas flow rate, turn on the circulating cooling device, and start heating up; after reaching the temperature to be measured, keep it warm for 10 min, and then click start to conduct the test.

[0077] Repeat the above procedure for the remaining sample tests. The data recording form is as follows;

[0078] Compare the data of 7075 aluminum alloy and 430F stainless steel with the product theoretical values and the data under the test of the vacuum furnace equipment. As shown in Table 1, observe the data deviation. It can be seen from the results of Table 1 that the difference rate between the test data of the sample by the atmosphere protection device of this application and the test data of the supporting vacuum furnace equipment is < 3.5%, meeting the requirements of scientific research tests.

[0079] Table 1

[0080]

[0081] In summary, this atmosphere protection device changes the traditional combination method, and alternately arranges rubber sealing gaskets and stainless steel sealing gaskets, so that the contact surfaces of both with the quartz tube or the pull rod are in a gradually changing mixed tooth shape, and the clamping and sealing effect is better; in addition, the original stainless steel sealing gasket is changed to an inverted trapezoidal structure, which improves the connection tightness with the rubber sealing gasket and increases the device sealing performance.

[0082] In addition, the cooling structure added to this device can reduce the test cooling time. After the high-temperature test is completed, the atmosphere can also be passed to cool down, effectively reducing the cooling time by 50%; compared with the test results of the "vacuum furnace" of the same batch of samples at the same temperature, the error of this device is ≤5%, meeting the comparison requirements of scientific research tests.

[0083] In addition, this device only needs to be assembled once. When changing the sample, only the end-sealing structure needs to be removed as a whole, and the fixture or sample can be replaced. The operation of replacing the sample is simple and convenient; the cost of the device of the present invention is low, and the overall cost does not exceed 2000 yuan. Under the condition of meeting the high-temperature test of samples in different atmospheres, the test cost is greatly reduced.

Claims

1. An atmosphere protection device for high-temperature testing, characterized in that, The atmosphere protection device for high-temperature testing is adapted to a universal testing machine, including a quartz tube and a sealing structure that is hermetically fitted to the end of the quartz tube. The sealing structure is slidably and hermetically fitted to the pull rod of the universal testing machine; the sealing structure includes a first flange sleeved on the quartz tube, a second flange tightly fixed to the first flange, and a flange cover tightly fixed to the second flange; A first sealing member is provided between the first flange and the quartz tube. The first flange, the first sealing member, and the second flange form a first sealing structure, and the first sealing structure seals the end of the quartz tube; A second sealing member is provided between the second flange and the pull rod. The second flange, the second sealing member, and the flange cover form a second sealing structure, and the second sealing structure is slidably and hermetically fitted to the pull rod of the universal testing machine; A gas inlet and outlet pipeline is connected to the second flange, and the gas inlet and outlet pipeline is communicated with the quartz tube.

2. The atmosphere protection device for high-temperature testing according to claim 1, wherein An annular baffle is provided on the inner wall of the bottom of the first flange, and the annular baffle is an integral structure with the first flange; The second flange includes an integrally connected lower ring plate, a support ring plate, and an upper ring plate; the lower ring plate, the support ring plate, and the upper ring plate are coaxially arranged; The support ring plate is detachably connected to the first flange; the upper ring plate is in threaded cooperation with the flange cover.

3. The atmosphere protection device for high-temperature testing according to claim 2, wherein The lower ring plate is in clearance fit with the quartz tube, and the upper ring plate is in clearance fit with the pull rod; the radial dimension of the lower ring plate is larger than the radial dimension of the upper ring plate; ventilation holes are provided on the support ring plate, and the ventilation holes are communicated with the lower ring plate; the ventilation holes are communicated with the gas inlet and outlet pipeline.

4. The atmosphere protection device for high-temperature testing according to claim 2, characterized in that, An annular groove matching with the quartz tube is further provided at the bottom of the support ring plate.

5. The atmosphere protection device for high-temperature testing according to claim 2, characterized in that, The first sealing member is sleeved on the outer wall of the quartz tube. When the first flange and the second flange are tightly fixed, the bottom end and the top end of the first sealing member are respectively in close contact with the annular baffle of the first flange and the bottom of the lower ring plate of the second flange; the inner and outer side walls of the first sealing member are respectively in contact and sealing cooperation with the inner wall of the first flange and the outer wall of the quartz tube.

6. The atmosphere protection device for high-temperature testing according to claim 2, characterized in that, The second sealing member is sleeved on the outer wall of the pull rod. When the flange cover is fixedly fitted with the upper ring plate of the second flange, the bottom end and the top end of the second sealing member are respectively in close contact with the inner bottom of the upper ring plate and the bottom of the flange cover; the inner and outer side walls of the second sealing member are respectively in contact and sealing cooperation with the upper ring plate and the pull rod.

7. The atmosphere protection device for high-temperature testing according to claim 1, wherein Both the first sealing member and the second sealing member include a rubber sealing washer and a stainless steel sealing washer; the rubber sealing washers and the stainless steel sealing washers are arranged alternately.

8. The atmosphere protection device for high-temperature testing according to claim 7, characterized in that, The longitudinal section of the stainless steel sealing washer is trapezoidal, and the longitudinal length of the outer wall of the stainless steel sealing washer is greater than the longitudinal length of its inner wall.

9. The atmosphere protection device for high-temperature testing according to claim 1, characterized in that, A cooling structure is further provided on the sealing structure. The cooling structure includes a first water inlet pipe and a first water outlet pipe provided on the first flange, and a second water inlet pipe and a second water outlet pipe provided on the second flange; the side walls of the first flange and the second flange are both hollow structures.

10. The atmosphere protection device for high-temperature testing according to claim 9, characterized in that, The first water inlet pipe and the second water inlet pipe of the cooling structure are respectively externally connected to a coolant and flow out through the first drain pipe and the second drain pipe to perform circulating cooling on the first flange and the second flange.

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