Flame tube flanging simulation piece test fixture

Abstract

The invention discloses a flame tube flanging simulation piece test fixture, which comprises an upper pressure head assembly, a lower support platform and two groups of support positioning seats detachably positioned and mounted on the lower support platform. The upper pressure head assembly is used for being connected with an upper chuck of test equipment, and the lower supporting platform is used for being connected with a lower chuck of the test equipment. The two groups of supporting and positioning seats are oppositely arranged at intervals and are used for cooperating to stably support and position a to-be-tested flame tube flanging simulation piece, and the upper pressure head assembly is used for stably, eccentrically and downwards pressing the simulation piece supported on the two groups of supporting and positioning seats so as to carry out an eccentric three-point bending test and a downwards pressing fatigue test on the simulation piece. One set of clamp can meet the requirements of eccentric three-point bending and pressing fatigue tests of a flame tube flanging simulation piece at the same time, meanwhile, universal tests of the test pieces can be achieved by replacing different supporting and positioning bases, it is guaranteed that composite acting force except bending cannot be generated when the simulation piece is loaded, and the flame tube flanging simulation piece is suitable for being applied to actual production engineering.

Description

Technical Field

[0001] This invention relates to the field of aero-engine flame tube technology, and in particular, to a test fixture for a flame tube flange simulation component. Background Technology

[0002] After modeling and simulating the flame tube component, it was found that there would be obvious stress concentration on the inner side of the flange under real service environment. Furthermore, mechanical analysis of the entire flame tube component revealed that the inner side of the flange is the location of the maximum stress in the component. Therefore, when evaluating the flame tube structure as a whole, it is most important to pay attention to whether the maximum stress at this location meets the design allowable value. Thus, this part was designed as a test element to conduct bending and fatigue tests. In this test, it is often required to provide support constraints on both sides of the bottom of the simulated part, and to accurately apply loads to the stress concentration area above the simulated part to meet the evaluation requirements.

[0003] The existing three-point bending fatigue test fixture includes a support chuck, an upper pressure chuck, a support roller assembly, and a calibrator. The support chuck has a rectangular repeating slot, with two parallel support chuck limiting slots on either side of the slot. A calibrator mounting slot is also located within the rectangular repeating slot. The upper pressure chuck has an upper pressure chuck limiting slot on its opposite side. During testing, the support roller assembly engages with the two support chuck limiting slots and the upper pressure chuck limiting slot, respectively. The calibrator ensures the simulated part is perfectly horizontal and perpendicular to the support rollers, unaffected by eccentric forces, and can be removed after calibration.

[0004] Existing three-point bending test fixtures are mostly standard three-point bending test fixtures. This type of fixture cannot be used to test simulated parts with geometric features, such as simulated parts with curvature. If this type of fixture is used forcibly, it will cause combined forces other than bending of the simulated part, which does not meet the test design and assessment requirements. Therefore, it is not suitable for actual production engineering applications.

[0005] Meanwhile, when conducting high-temperature three-point bending tests, the support points of existing fixtures often fail under high-temperature conditions and stick to the specimen. In severe cases, this can lead to off-axis loading of the testing machine, causing irreversible damage to the testing equipment, seriously affecting the progress of the test and equipment maintenance, and resulting in significant economic losses.

[0006] Furthermore, the existing fixtures are all one-piece structures, making it impossible to disassemble and replace any key components. If any component is damaged, the entire fixture body needs to be replaced and reprocessed, which delays the progress of the test and increases the test cost, which is not in line with actual production engineering applications. Summary of the Invention

[0007] This invention provides a test fixture for a flame tube flanged simulation component, which solves the problems of existing test fixtures that cause combined forces other than bending of the simulation component, fail to meet the test design and assessment requirements, usually fail in high-temperature environments, stick to the sample, and in severe cases cause off-axis loading of the testing machine, causing irreversible damage to the testing machine equipment, seriously affecting the test progress and equipment maintenance, resulting in significant economic losses. The fixture body is all one-piece structure, making it impossible to disassemble and replace a key component.

[0008] The technical solution adopted in this invention is as follows: A test fixture for a flame tube flange simulation component includes: an upper pressure head assembly and a lower support platform arranged at intervals, and two sets of support positioning seats detachably mounted on the lower support platform; the upper pressure head assembly is used to connect to the upper clamp of the test equipment, and the lower support platform is used to connect to the lower clamp of the test equipment; the two sets of support positioning seats are arranged at intervals to cooperate in stabilizing and positioning the flame tube flange simulation component to be tested, and the upper pressure head assembly is used to stabilize the eccentrically pressed simulation component supported on the two sets of support positioning seats for conducting eccentric three-point bending tests and downward pressure fatigue tests on the simulation component.

[0009] Furthermore, each set of support positioning seats is connected and positioned to the lower support platform through a concave-convex mating structure, and the support positioning seats and the lower support platform are also locked and fixed by multiple sets of first fasteners.

[0010] Furthermore, the lower support platform includes a first adapter for connecting to the lower clamp of the test equipment, and a mounting platform fixed to the top of the first adapter by a second fastener; two sets of support positioning seats are respectively fixed to the mounting platform by the first fastener; the material of the mounting platform may be the same as or different from the material of the support positioning seats and the first fastener, depending on the test temperature.

[0011] Furthermore, the upper surface of the mounting platform is machined with two parallel and recessed limiting grooves, each of which extends laterally to the side of the mounting platform; the bottom of the support positioning seat is provided with a connecting strip that matches the corresponding limiting groove, and the support positioning seat is slidably inserted into the limiting groove from the side of the mounting platform through its connecting strip, and multiple sets of first fasteners are respectively inserted through the mounting platform and the corresponding support positioning seat to detachably fix the two.

[0012] Furthermore, the top edge of each set of support positioning seats that contacts the simulation part is the first contact edge that contacts the lower surface line of the simulation part, and the first contact edge is the first conforming surface that completely matches the profile of the contact position of the lower surface of the simulation part.

[0013] Furthermore, the cross-section of the support positioning seat is inverted "T" shape, including a horizontal part and a vertical part that intersect perpendicularly; the support positioning seat is supported and positioned on the lower support platform by its horizontal part; the top of the vertical part of the support positioning seat is machined to form a first conforming surface.

[0014] Furthermore, the vertical portion of the support positioning seat gradually tilts and approaches each other on opposite sides along its upward extension direction, so that the top of the vertical portion forms a first conforming surface; or, the vertical portion of the support positioning seat gradually tilts and approaches each other on one side along its upward extension direction towards another vertical side, so that the top of the vertical portion forms a first conforming surface.

[0015] Furthermore, the upper pressure head assembly includes a second conversion joint for connecting to the upper clamp of the test equipment, a connecting rod vertically connected to the bottom end of the second conversion joint, and a pressure head connected to the bottom end of the connecting rod; the pressure head is used to stabilize the eccentrically pressed down on the simulation component supported on two sets of support positioning seats.

[0016] Furthermore, the bottom surface of the pressure head that contacts the simulated part is a second contact edge that contacts the upper surface of the simulated part, and the second contact edge is a second conforming surface that matches the profile of the contact position on the upper surface of the simulated part.

[0017] Furthermore, the connecting rod is a bolted connecting rod with external threads at both ends, and the two ends of the bolted connecting rod are threadedly connected to the second conversion joint and the pressure head, respectively.

[0018] The present invention has the following beneficial effects: This invention fills the gap in current testing fixtures for high-temperature eccentric three-point bending and compression fatigue tests on flame tube flanged simulation parts that combine adaptability to actual component dimensions and realism of test conditions. It provides a testing fixture for flame tube flanged simulation parts, which adopts the following technical solution: 1. The present invention includes two sets of support positioning seats, which support both sides of the bottom surface of the flame tube flanged simulation part. The two sets of support positioning seats and the lower support platform form a working platform, which is directly connected to the lower clamp of the test equipment to provide support force to the working platform. This provides a stable horizontal placement platform for the flame tube flanged simulation part, and allows for the sequential conduction of two different tests, namely, eccentric three-point bending test and compressive fatigue test, without changing the clamping fixture. One set of clamping fixtures can simultaneously meet the needs of eccentric three-point bending and compressive fatigue tests of the flame tube flanged simulation part, which has significant economic advantages. 2. In this invention, the two sets of support positioning seats are detachably connected to the lower support platform. Therefore, during high-temperature testing, the failure of alloy materials under high-temperature environments can be addressed by replacing the two sets of support positioning seats, avoiding irreversible damage to the testing equipment, affecting test progress and equipment maintenance, and preventing significant economic losses. Furthermore, for flame tube flange simulation parts with different flange angles, different support positioning seats can be used to achieve universal testing for this type of specimen. Compared to existing integrated fixtures, this invention greatly improves economy and applicability. 3. In the present invention, the upper pressure head assembly can stably and eccentrically press down on the simulation part, thereby ensuring that no combined force other than bending is generated when loading the simulation part, which meets the test design and assessment requirements and is suitable for application in actual production engineering.

[0019] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the spatial structure of the test fixture for the flame tube flange simulation component according to a preferred embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the left-side structure of the test fixture for the flame tube flange simulation component.

[0021] Legend: 1. Second adapter joint; 2. Bolted connecting rod; 3. Press head; 301. Second conforming surface; 4. Simulation parts; 5. Support positioning seat; 501. First conforming surface; 51. Horizontal part; 52. Vertical part; 7. Mounting platform; 8. First fastener; 9. First adapter; 10. Second fastener. Detailed Implementation

[0022] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] Those skilled in the art will understand that, unless specifically stated otherwise, the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, components, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, components, and / or combinations thereof. It should be understood that when we say a component is "connected" to another component, it can be directly connected to the other component or connected via an intermediate component. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items. The terms "first" and "second," etc., in this specification and claims are used to distinguish different objects, not to describe a particular order.

[0024] Reference Figure 1 A preferred embodiment of the present invention provides a test fixture for a flame tube flange simulation component, comprising: an upper pressure head assembly and a lower support platform arranged at intervals, and two sets of support positioning seats 5 detachably mounted on the lower support platform. The upper pressure head assembly is used to connect to the upper clamp of the test equipment, and the lower support platform is used to connect to the lower clamp of the test equipment. The two sets of support positioning seats 5 are arranged at intervals to cooperate in stabilizing and supporting the simulated flame tube flange to be tested, and the upper pressure head assembly is used to stabilize the simulated component 4 eccentrically pressed down on the two sets of support positioning seats 5 for conducting eccentric three-point bending tests and downward fatigue tests on the simulated component.

[0025] This invention fills the gap in current testing fixtures for high-temperature eccentric three-point bending and compression fatigue tests on flame tube flanged simulation parts that combine adaptability to actual component dimensions and realism of test conditions. It provides a testing fixture for flame tube flanged simulation parts, which adopts the following technical solution: 1. The present invention includes two sets of support positioning seats 5, which support both sides of the bottom surface of the simulated flame tube flange 4. The two sets of support positioning seats 5 and the lower support platform form a working platform, which is directly connected to the lower clamp of the test equipment to provide support force to the working platform. This provides a stable horizontal placement platform for the simulated flame tube flange 4, allowing for sequential eccentric three-point bending tests (the simulated flame tube flange 4 is curved, the two sets of support positioning seats 5 and the upper pressure head assembly form a three-point bending, and the upper pressure head assembly eccentrically presses down on the simulated flame tube flange 4) without changing the clamping fixture. Figure 2 As shown in the figure, a single clamping fixture can simultaneously meet the needs of both eccentric three-point bending and compression fatigue testing of the flame tube flange simulation part, demonstrating significant economic advantages. 2. In this invention, the two sets of support positioning seats 5 are detachably connected to the lower support platform. Therefore, during high-temperature testing, the failure of alloy materials under high-temperature conditions can be addressed by replacing the two sets of support positioning seats 5, avoiding irreversible damage to the testing equipment, affecting test progress and equipment maintenance, and preventing significant economic losses. Furthermore, for flame tube flange simulation parts with different flange angles, different support positioning seats 5 can be used to achieve universal testing for this type of specimen. Compared to existing integrated fixtures, this invention greatly improves economy and applicability. 3. In the present invention, the upper pressure head assembly can stably and eccentrically press down on the simulation part 4, thereby ensuring that no combined force other than bending will be generated when loading the simulation part 4, which meets the test design and assessment requirements and is suitable for application in actual production engineering.

[0026] Optionally, such as Figure 1 As shown, each set of support positioning seats 5 is connected and positioned to the lower support platform through a concave-convex fitting structure, and the support positioning seats 5 and the lower support platform are also locked and fixed by multiple sets of first fasteners 8; the concave-convex fitting connection structure not only facilitates the quick installation of the support positioning seats 5, but also guides and limits the installation of the support positioning seats 5.

[0027] Optionally, such as Figure 1 As shown, the lower support platform includes a first adapter 9 for connecting to the lower clamp of the testing equipment, and a mounting platform 7 fixed to the top of the first adapter 9 by a second fastener 10. Two sets of support positioning seats 5 are respectively fixed to the mounting platform 7 by first fasteners 8. In this optional solution, as... Figure 1 As shown, the present application uses two support positioning seats 5 to support both sides of the bottom surface of the flame tube flange simulation part. At the same time, the bottom surface of the two support positioning seats 5 forms a platform, which is directly connected to the lower clamp of the testing machine through the first conversion joint 9 to provide support force to the platform, thereby providing a stable horizontal placement platform for the flame tube flange simulation part. Thus, the eccentric three-point bending test and the compressive fatigue test can be carried out without changing the clamping fixture. Therefore, one set of fixtures in this application can simultaneously solve the two test requirements of the eccentric three-point bending test and the compressive fatigue test of the flame tube flange simulation part, which has significant economic benefits.

[0028] Preferably, the material of the mounting platform 7 can be the same as or different from that of the support positioning seat 5 and the first fastener 8, depending on the test temperature. In environments where high-temperature alloys experience overheating failure, the fixture of this invention can utilize two different materials on the same fixture to cope with complex test environments: for example, at test temperatures of 1200℃ and above, the mounting platform 7, due to its lower stress and adjustable thickness and dimensions, can continue to use a single-crystal alloy material with an effective operating temperature of 1000℃ for effective overheating; while the support positioning seat 5, due to its contact with the simulation component 4 and higher stress, can be made of a ceramic material with an effective operating temperature of 1400℃. Similarly, at 1000℃, the mounting platform 7 can be made of a powder alloy with lower cost and shorter production cycle, while the support positioning seat 5 can be made of a single-crystal alloy with better temperature resistance but a slightly higher cost and longer production cycle. This avoids the disadvantages of high cost and long production cycle of using only ceramic materials or single crystal alloy materials, and enables the effective use of materials at high temperatures, thus improving the applicability and economy of the fixture of this invention under different test temperatures.

[0029] Specifically, different materials are selected for the mounting platform 7 and the support positioning seat 5 according to different test temperatures. For test temperatures between 600℃ and 1000℃, a powder alloy mounting platform 7 and a single crystal alloy support positioning seat 5 can be used; for test temperatures between 1000℃ and 1300℃, a single crystal alloy mounting platform 7 and a ceramic support positioning seat 5 can be used. This measure greatly improves the applicability of the fixture of the present invention to different test temperatures, while also reducing the economics of fixture processing and improving processing efficiency.

[0030] Optionally, such as Figure 1As shown, the upper surface of the mounting platform 7 is machined with two parallel, spaced-apart, and recessed limiting grooves, each extending laterally to the side of the mounting platform 7. The bottom of the support positioning seat 5 is provided with a connecting strip that matches the corresponding limiting groove. The support positioning seat 5 is slidably inserted into the limiting groove from the side of the mounting platform 7 via its connecting strip, and multiple sets of first fasteners 8 are respectively inserted through the mounting platform 7 and the corresponding support positioning seat 5 to detachably fix the two. In this optional solution, the two sets of support positioning seats 5 are fixed to the mounting platform 7 by multiple sets of first fasteners 8, thereby constraining the vertical position of the support positioning seats 5. The support positioning seats 5 slide into the limiting groove on the mounting platform 7, thereby constraining both sides of the support positioning seats 5. The above connection method can realize timely replacement when the support positioning seats 5 and the first fasteners 8 are damaged in high temperature environments, saving alloy materials used to manufacture the main platform of the fixture, and significantly improving test efficiency and economy. On the other hand, when conducting high temperature tests, the failure of alloy materials in high temperature environments can be addressed by replacing the support positioning seats 5 and the first fasteners 8. At the same time, for flame tube flange simulation parts with different flange angles, the universal test of such specimens can be achieved by replacing different support positioning seats 5 and the first fasteners 8. Compared with an integrated fixture, it can greatly improve economy and applicability.

[0031] Preferably, such as Figure 1 and Figure 2 As shown, the top edge of each support positioning seat 5 that contacts the simulation part 4 is the first contact edge that makes line contact with the lower surface of the simulation part 4, and the first contact edge is the first conforming surface 501 that completely matches the profile of the contact position with the lower surface of the simulation part 4. In this preferred embodiment, the supporting force transmitted from the lower clamp of the testing machine through the first conversion joint 9 and the mounting table 7 can be effectively transmitted to the simulation part 4 through line contact. While providing stable and uniform support for the simulation part 4, it also reduces the planar contact area between the support positioning seat 5 and the simulation part 4, reducing the risk of failure and adhesion between the simulation part 4 and the support positioning seat 5 under high temperature conditions.

[0032] In this optional solution, such as Figure 1 As shown, the cross-section of the support positioning seat 5 is inverted "T" shaped, including a horizontal portion 51 and a vertical portion 52 that intersect perpendicularly. The support positioning seat 5 is supported and positioned on the lower support platform by its horizontal portion 51. The top of the vertical portion 52 of the support positioning seat 5 is machined to form a first conforming surface 501. In this optional solution, this structural design of the support positioning seat 5 can effectively increase the contact area with the lower support platform, thereby achieving a stable connection and support. On the other hand, it also reduces the amount of machining required to form the first conforming surface 501, thereby improving machining efficiency and machining accuracy.

[0033] Optionally, such as Figure 1 and Figure 2As shown, the vertical portion 52 of the support positioning base 5 gradually tilts and converges towards each other on opposite sides along its upward extension direction, so that the top of the vertical portion 52 forms a first conforming surface 501. Alternatively, the vertical portion 52 of the support positioning base 5 gradually tilts and converges towards each other on one side along its upward extension direction, so that the top of the vertical portion 52 forms a first conforming surface 501. In this optional solution, regardless of the processing method used, the first conforming surface 501 can stably support the simulation part 4, while reducing processing difficulty and ensuring processing accuracy.

[0034] Optionally, such as Figure 1 As shown, the upper pressure head assembly includes a second adapter 1 for connecting to the upper clamp of the testing equipment, a connecting rod vertically connected to the bottom end of the second adapter 1, and a pressure head 3 connected to the bottom end of the connecting rod. The pressure head 3 is used to stabilize and press down the simulated component 4, which is eccentrically supported on two sets of support positioning seats 5. In this optional scheme, the upper pressure head assembly has a simple structure and low manufacturing cost.

[0035] In this optional solution, such as Figure 1 and Figure 2 As shown, the bottom surface of the pressure head 3 that contacts the simulation part 4 is the second contact edge that is in line contact with the upper surface of the simulation part 4, and the second contact edge is the second conforming surface 301 that matches the profile of the contact position of the upper surface of the simulation part 4. In this optional scheme, the first contact edge of the support positioning seat 5 is a first conforming surface 501 that completely matches the profile of the contact position of the lower surface of the simulation part 4, thereby effectively transmitting the support force from the lower clamp of the testing machine through the first conversion joint 9 and the mounting table 7 to the simulation part 4 through line contact; at the same time, the second contact edge at the bottom of the pressure head 3 is a second conforming surface 301 that matches the profile of the contact position of the upper surface of the simulation part 4. This design can effectively transmit the pressure from the upper clamp of the testing machine through the second conversion joint 1 and the connecting rod to the simulation part 4 through line contact, thereby realizing the effective loading method of the test; on the other hand, in this invention, the pressure head 3, made of high-temperature alloy material, loads the flame tube flange simulation part. Due to the design of the second conforming surface 301 at the bottom of the pressure head 3, it can be ensured that no stress concentration phenomenon occurs during the loading of the simulation part 4, thereby realizing the true reproduction of the experimental environment, and at the same time, there is no eccentric loading, thereby improving the loading accuracy and meeting the design assessment requirements.

[0036] In this optional solution, such as Figure 1As shown, the connecting rod is a bolted connecting rod 2 with external threads at both ends. The two ends of the bolted connecting rod 2 are threadedly connected to the second conversion joint 1 and the pressure head 3, respectively. In this optional scheme, the upper end of the upper pressure head assembly is connected to the upper clamp of the testing machine through the second conversion joint 1. The lower end of the second conversion joint 1 has a bolt hole, which is connected to the pressure head 3 through the double-ended bolted connecting rod 2, thereby constraining the position of the upper pressure head assembly. At the same time, the pressure head 3 is connected to the upper clamp of the testing machine through the bolted connecting rod 2, which can ensure the centering of the test and allow for testing of flame tube flanged simulation parts with different flange angles by changing the pressure head 3 of different shapes, thus greatly improving the applicability of this set of fixtures to this type of specimen. In addition, this connection method can enable timely replacement when the pressure head is damaged or fails in a high-temperature environment, saving the time of fixture reprocessing and high-temperature alloy materials, which can significantly improve the test efficiency and improve economy.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A test fixture for a flame tube flange simulation component, characterized in that, include: The upper pressure head assembly and the lower support platform are arranged at relative intervals, and two sets of support positioning seats (5) are detachably positioned and installed on the lower support platform. The upper pressure head assembly is used to connect to the upper clamp of the testing equipment, and the lower support platform is used to connect to the lower clamp of the testing equipment; Two sets of support positioning seats (5) are set at relative intervals to cooperate in stabilizing the support and positioning of the simulated flame tube flange to be tested, and the upper pressure head assembly is used to stabilize the simulated part supported on the two sets of support positioning seats (5) for eccentric three-point bending test and pressure fatigue test of the simulated part. Each set of support positioning seats (5) is connected and positioned to the lower support platform through a concave-convex fit structure, and the support positioning seats (5) and the lower support platform are also locked and fixed by multiple sets of first fasteners (8); The lower support platform includes a first adapter (9) for connecting to the lower clamp of the test equipment, and a mounting platform (7) fixed to the top of the first adapter (9) by a second fastener (10); two sets of support positioning seats (5) are fixed to the mounting platform (7) by the first fastener (8); the material of the mounting platform (7) may be the same as or different from the material of the support positioning seats (5) and the first fastener (8) depending on the test temperature.

2. The test fixture for the flame tube flange simulation component according to claim 1, characterized in that, The upper surface of the mounting platform (7) is machined with two parallel and recessed limiting grooves, each of which extends laterally to the side of the mounting platform (7). The bottom of the support positioning seat (5) is provided with a connecting strip that matches the corresponding limiting groove. The support positioning seat (5) is slidably installed into the limiting groove from the side of the mounting platform (7) through its connecting strip. Multiple sets of first fasteners (8) are respectively installed through the mounting platform (7) and the corresponding support positioning seat (5) to fix the two in a detachable manner.

3. The test fixture for the flame tube flange simulation component according to claim 1, characterized in that, The top edge of each set of support positioning bases (5) that contacts the simulation part (4) is the first contact edge that contacts the lower surface line of the simulation part (4), and the first contact edge is the first conforming surface (501) that completely matches the profile of the contact position of the lower surface of the simulation part (4).

4. The test fixture for the flame tube flange simulation component according to claim 3, characterized in that, The cross section of the support positioning seat (5) is inverted "T" shaped, including a horizontal part (51) and a vertical part (52) that intersect perpendicularly. The support positioning seat (5) is supported and positioned on the lower support platform by its transverse part (51); The top of the vertical part (52) of the support positioning seat (5) is machined to form a first conforming surface (501).

5. The test fixture for the flame tube flange simulation component according to claim 4, characterized in that, The vertical portion (52) of the support positioning seat (5) gradually tilts and converges towards each other on opposite sides along its upward extension direction, so that the top of the vertical portion (52) forms a first conforming surface (501); or The vertical part (52) of the support positioning seat (5) gradually tilts and moves closer to another vertical side along its upward extension direction so that the top of the vertical part (52) forms a first conforming surface (501).

6. The test fixture for the flame tube flange simulation component according to claim 1, characterized in that, The upper pressure head assembly includes a second adapter (1) for connecting to the upper clamp of the test equipment, a connecting rod vertically connected to the bottom end of the second adapter (1), and a pressure head (3) connected to the bottom end of the connecting rod. The pressure head (3) is used to stabilize the eccentrically pressed simulation component (4) supported on two sets of support positioning seats (5).

7. The test fixture for the flame tube flange simulation component according to claim 6, characterized in that, The bottom surface of the pressure head (3) that contacts the simulation part (4) is the second contact edge that is in line contact with the upper surface of the simulation part (4), and the second contact edge is the second conforming surface (301) that matches the profile of the contact position of the upper surface of the simulation part (4).

8. The test fixture for the flame tube flange simulation component according to claim 6, characterized in that, The connecting rod is a bolt connecting rod (2) with external threads at both ends. The two ends of the bolt connecting rod (2) are threadedly connected to the second conversion joint (1) and the pressure head (3) respectively.

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