A flexible sensor fixture and sample loading tool for high-temperature testing

Abstract

This invention discloses a flexible sensor fixture and sample loading tool for high-temperature testing, comprising a fixed-end fixture and a movable-end fixture axially joined together. The fixed-end fixture comprises a cylindrical fixed body, with an extension body axially joined at one end, and a fixed sensor clamp at the end of the extension body. The movable-end fixture comprises a cylindrical movable body, with a movable sensor clamp at one end. The outer diameter of the movable body is smaller than that of the fixed body, and a sample loading auxiliary ring ensures that the movable body and the fixed body are coaxial. This invention enables static / dynamic bending and tensile stress-strain testing of flexible mechanical sensors at 1200℃, meeting the high-temperature performance testing requirements of high-temperature flexible sensors below 1200℃, and contributing to the research and application of high-temperature flexible sensors.

Description

Technical Field

[0001] This invention relates to the field of flexible sensor testing technology, specifically to a flexible sensor fixture and sample loading tool for high-temperature testing. Background Technology

[0002] High-temperature strain sensing has important applications in aerospace, energy, and metallurgy. Researchers have proposed various testing methods for high-temperature flexible strain sensing, such as those based on fiber optic sensors and resistive sensors, to address strain measurement needs under different high-temperature environments. However, high-temperature strain sensing testing technology still faces some challenges, including a lack of accurate and reliable testing devices to measure the tensile and bending strain performance of strain sensors under high-temperature conditions. Currently, only testing devices based on fixed strain molds can measure the changes in sensors under different strain conditions; an effective device for dynamically testing tensile and bending strain performance at high temperatures has been lacking.

[0003] Patent document CN115290127A discloses a testing device for the performance of flexible sensors, but this device can only be used to test flexible sensors at room temperature and cannot test the mechanical properties of sensors under high temperature conditions. Patent document CN111735714A discloses a high-temperature strain sensor testing device based on optical fiber, which is only suitable for static stress and strain testing of sensors at high temperatures and cannot realize dynamic stress and strain testing of sensors at high temperatures.

[0004] Therefore, in order to address the above shortcomings, there is an urgent need for a dynamic response testing device that can truly realize the flexible stress-strain sensor at high temperatures. Summary of the Invention

[0005] The purpose of this invention is to provide a flexible sensor fixture and sample loading tool for high-temperature testing, which can test the response of flexible mechanical sensors to bending strain and tensile strain mechanical signals at a high temperature of 1200℃. This addresses the problem that existing sensor performance testing devices can only be used for testing flexible sensors at room temperature and cannot test the mechanical properties of sensors under high-temperature conditions. Furthermore, traditional high-temperature sensor fixtures are only suitable for static stress-strain testing of sensors at high temperatures and cannot achieve dynamic stress-strain testing of sensors at high temperatures.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A flexible sensor fixture for high-temperature testing comprises a fixed end fixture and a movable end fixture arranged axially. The fixed end fixture has a cylindrical fixed body, one end of which is axially connected to an extension body, and a fixed sensor clamp is provided at the end of the extension body. The movable end fixture has a cylindrical movable body, one end of which is provided with a movable sensor clamp. The outer diameter of the movable body is smaller than that of the fixed body, and the movable body and the solid body are made coaxial by moving a sample loading auxiliary ring.

[0008] Optionally, a fixed sample loading auxiliary ring is coaxially arranged on the extension body, including a first sample loading auxiliary ring and a second sample loading auxiliary ring arranged at intervals; the outer diameter of the first sample loading auxiliary ring is larger than the outer diameter of the second sample loading auxiliary ring, and the first sample loading auxiliary ring and the second sample loading auxiliary ring are coaxial.

[0009] Optionally, the fixed sensor clamp is provided with a first clamp body, the first clamp body has a first slot provided with an end opening, and a first fixing hole is drilled on the side of the first slot.

[0010] Optionally, a counterweight pull ring is provided at the other end of the fixed body; the overall center of gravity of the counterweight pull ring is lower than the axis of the test cavity.

[0011] Optionally, a moving sample loading auxiliary ring and a first positioning ring are also provided at intervals on the moving main body behind the moving sensor clamp; a positioning installation unit is provided at the other end of the moving main body.

[0012] Optionally, the movable sensor clamp is provided with a second clamp body, the second clamp body having a second slot provided with an end opening, and a second fixing hole being drilled on the side of the second slot.

[0013] Optionally, the movable sample loading auxiliary ring includes a third sample loading auxiliary ring and a fourth sample loading auxiliary ring spaced apart; the outer diameter of the third sample loading auxiliary ring is larger than the outer diameter of the fourth sample loading auxiliary ring, and the third sample loading auxiliary ring and the fourth sample loading auxiliary ring are coaxial.

[0014] Optionally, the positioning and installation unit is provided with a second positioning ring and an installation head in sequence, and a snap-fit ​​groove is cut on the side of the installation head; the first positioning ring, the second positioning ring and the moving sample loading auxiliary ring have the same radius of curvature.

[0015] A sample loading tool for a flexible sensor fixture for high-temperature testing according to the present invention is provided with a fixed end block and a movable end block that are inserted into each other; the lower surfaces of the fixed end block and the movable end block are in contact with the upper surfaces of the fixed end fixture and the movable end fixture, so that the upper surfaces of the fixed end fixture and the movable end fixture are located on the same plane.

[0016] Optionally, the fixed end block is provided with a plug-in body, and a fixed snap-fit ​​block is provided at one end of the plug-in body; the movable end block is provided with a groove body, one end of the groove body is open, and a movable snap-fit ​​block is provided at the other end; the other end of the plug-in body is inserted into the groove body along the open end, and the movable end block is also connected to an extension rod.

[0017] The advantages of this invention are:

[0018] 1. This invention can perform stress-strain tests on flexible mechanical sensors under static / dynamic bending and tension at high temperatures;

[0019] 2. The present invention has a wide applicable temperature range, which is 0 to 1200℃. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of the flexible sensor fixture and sample loading tool for high-temperature testing during the sample loading process.

[0022] Figure 2 This is a schematic diagram of the flexible sensor fixture for high-temperature testing of the present invention during testing;

[0023] Figure 3 This is a schematic diagram and a detailed enlarged view of the structure of the fixed end clamp of the flexible sensor fixture for high-temperature testing according to the present invention;

[0024] Figure 4 This is a schematic diagram and a detailed enlarged view of the structure of the fixed end clamp of the flexible sensor fixture for high-temperature testing according to the present invention;

[0025] Figure 5 This is a schematic diagram of the assembly structure of the sample loading tool of the present invention;

[0026] The labels in the diagram represent:

[0027] 1-Fixed end clamp, 2-Moving end clamp, 3-Adapter rod, 4-Extension rod, 5-Moving end stop, 6-Fixed end stop, 7-Test chamber;

[0028] 11-Fixed main body, 12-Extension body, 121-Fixed sample loading auxiliary ring, 1211-First sample loading auxiliary ring, 1212-Second sample loading auxiliary ring, 122-Fixed sensor clamp, 1221-First clamp main body, 1222-First slot, 1223-First fixing hole, 13-Counterweight pull ring;

[0029] 21-Moving main body, 22-Moving sample loading auxiliary ring, 221-Third sample loading auxiliary ring, 222-Fourth sample loading auxiliary ring, 23-Moving sensor clamp, 231-Second clamp main body, 232-Second slot, 233-Second fixing hole, 24-First positioning ring, 25-Positioning mounting unit, 251-Second positioning ring, 252-Mounting head, 253-Snap-fit ​​groove;

[0030] 51-Groove body, 52-Positioning groove, 53-Moving snap-fit ​​block, 61-Fixed snap-fit ​​block, 62-Plug-in body, 63-Positioning hole. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] Traditional high-temperature mechanical sensors are only suitable for static stress-strain testing at high temperatures, and cannot perform dynamic stress-strain testing at high temperatures. Furthermore, existing flexible mechanical sensor testing devices cannot operate at high temperatures. This invention independently designs a flexible sensor fixture for high-temperature testing. This fixture can perform multiple mechanical property tests on flexible mechanical sensors at 1200℃, filling a gap in the market for flexible sensor fixtures for high-temperature testing.

[0033] Combination Figure 1-5 The flexible sensor fixture for high-temperature testing of the present invention comprises a fixed end fixture 1 and a movable end fixture 2 axially connected together. The fixed end fixture 1 comprises a cylindrical fixed body 11, with an extension 12 axially connected to the end of the fixed body 11, and a fixed sensor chuck 122 at the end of the extension 12. The movable end fixture 2 comprises a cylindrical movable body 21, with a movable sensor chuck 23 at the end of the movable body 21. The outer diameter of the movable body 21 is much smaller than that of the fixed body 11 to reduce the overall mass of the movable end fixture 2, facilitate its reciprocating movement in the test cavity during testing, reduce friction, and ensure coaxiality between the movable body and the solid body through a movable sample loading auxiliary ring 22. During use, a special sample loading tool is required to place the sensor fixture inside the high-temperature device. The fixed end fixture 1 and the movable end fixture 2 are cylindrical in shape and have the same radius of curvature as the test cavity 7 of the high-temperature testing device, ensuring coaxiality by being tangent to the inner wall of the test cavity 7. It can be manufactured to withstand temperatures above 1200℃ under an argon atmosphere, with a coefficient of thermal expansion of less than 10×10E. -6Materials with good insulation properties, such as quartz and ceramics, are used. All parts of the device are integrally machined or hot-pressed using CNC machine tools to ensure the reliability and stability of its connections at high temperatures.

[0034] A fixed sensor clamp 122 is provided with a first clamp body 1221. The first clamp body 1221 has a first slot 1222 with an end opening, and a first fixing hole 1223 is drilled on the side of the first slot 1222. A movable sensor clamp 23 is provided with a second clamp body 231. The second clamp body 231 has a second slot 232 with an end opening, and a second fixing hole 233 is drilled on the side of the second slot 232. Specifically, it includes a front end slit and two through holes symmetrically distributed along the axis. The front end slit is used to place the sensor under test. When performing a bending test, a precious metal paste can be used for fixation and a guide wire can be connected. If the sensor under test has already been connected to a wire, the sensor can be directly bent without strong fixation. When performing a tensile test, a through hole needs to be pre-drilled at the corresponding position of the sensor under test. After placing the sensor under test in the front end slit, a quartz plunger is inserted into the sensor clamp of the fixed end clamp to fix the sensor under test. When the inner diameter of the test chamber is 45mm, the applicable sensor width is 0-10mm. When other sizes of test chamber inner diameter are used, the width should generally not exceed 1 / 4 of the inner diameter of the test chamber.

[0035] The fixed-end clamp 1 is also coaxially mounted with a sample loading auxiliary ring 121 on the extension body 12, including a first sample loading auxiliary ring 1211 and a second sample loading auxiliary ring 1212 spaced apart; the outer diameter of the first sample loading auxiliary ring 1211 is larger than the outer diameter of the second sample loading auxiliary ring 1212, and the first sample loading auxiliary ring 1211 and the second sample loading auxiliary ring 1212 are coaxial. A counterweight pull ring 13 is provided at the other end of the fixed body 11; the overall center of gravity of the counterweight pull ring 13 is lower than the axis of the test chamber 7, ensuring that the fixed-end clamp 1 remains basically horizontal in the test chamber 7. The counterweight pull ring 13 can be used to connect high-temperature resistant cables, making it easy to remove the fixed-end clamp 1 directly after the test.

[0036] The mobile end fixture 2 is further provided with a movable sample loading auxiliary ring 22 and a first positioning ring 24 spaced apart on the movable body 21 behind the movable sensor clamp 23; a positioning mounting unit 25 is provided at the other end of the movable body 21. The movable sample loading auxiliary ring 22 includes a third sample loading auxiliary ring 221 and a fourth sample loading auxiliary ring 222 spaced apart; the outer diameter of the third sample loading auxiliary ring 221 is larger than the outer diameter of the fourth sample loading auxiliary ring 222, and the third sample loading auxiliary ring 221 and the fourth sample loading auxiliary ring 222 are coaxial. This ensures that the fixed end fixture 1 remains basically horizontal in the test chamber 7.

[0037] The positioning and mounting unit 25 is sequentially equipped with a second positioning ring 251 and a mounting head 252. A snap-fit ​​groove 253 is cut into the side of the mounting head 252. The first positioning ring 24, the second positioning ring 251, and the moving sample loading auxiliary ring 22 have the same radius of curvature. The snap-fit ​​groove 253 is a square groove, facilitating connection with the square head of the adapter rod 3. After connection, the adapter rod 3 is also located along the axial direction of the test chamber 7, ensuring that the entire flexible sensor fixture for high-temperature testing can only move along the axial direction of the test chamber 7.

[0038] The first sample loading auxiliary ring 1211 and the second sample loading auxiliary ring 1212 of the fixed end clamp 1 are used to cooperate with the protruding part of the fixed end stop 6 of the sample loading tool, and the third sample loading auxiliary ring 221 and the fourth sample loading auxiliary ring 222 of the moving end clamp 2 are used to cooperate with the protruding part of the moving end stop 5 of the sample loading tool, so that during the sample loading process, the fixed end clamp 1 and the moving end clamp 2 can be directly pushed by the sample loading tool to move along the axial direction in the test cavity 7.

[0039] When performing bending tests, platinum paste, silver-palladium paste, or silver-platinum paste are used for fixation and guide wire connection. The curing temperature range is 850–1050℃, the heating rate is 2–30℃ / min, and the curing time is 5–60min. When the inner diameter of the test chamber 7 is 45mm, the applicable sensor width is 0–10mm.

[0040] The lower surfaces of the fixed end stop and the moving end stop are in contact with the upper surfaces of the fixed end clamp and the moving end clamp of the flexible sensor fixture for high temperature testing, so that the upper surfaces of the fixed end clamp and the moving end clamp of the flexible sensor fixture for high temperature testing are located on the same plane, so as to ensure that the mechanical sensor does not twist.

[0041] The fixed end block 6 is equipped with a connector 62, with a fixed locking block 61 at one end. The movable end block 5 is equipped with a recessed body 51, with one end open and a movable locking block 53 at the other end. The other end of the connector 62 is inserted into the recessed body 51 along the open end. The movable end block 5 is also connected to an extension rod 4. The fixed end block 6 is L-shaped, with a protrusion at the front end for engaging with the corresponding position of the fixed end clamp 1. The movable end block 5 is modified from the L-shape with a C-shaped groove of similar length to the fixed end block 6 for engaging with the fixed end block 5. The fixed end block 5 can slide to different positions within the groove to accommodate sensors of different lengths. The bottom of the C-shaped groove has a straight opening, which is a positioning groove 52. The fixed end clamp 1 has a corresponding screw hole, which is a positioning hole 63. The two can be fastened with screws to ensure that the fixed end block 6 and the movable end block 5 do not shift relative to each other during sample loading. The extension rod 4 can be connected to the moving end block 5 by means of threading, welding, etc., which facilitates the application of force during the process of sending the flexible sensor fixture for high temperature testing into the test chamber 7, as well as the retrieval of the moving end block 5 and the fixed end block 6 after the sample is loaded.

[0042] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0043] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0044] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A flexible sensor clamp for high temperature testing with a loading tool, characterized by, The fixed end block (6) and the moving end block (5) are arranged in plug-in mode; The lower surfaces of the fixed end block (6) and the moving end block (5) are attached to the upper surfaces of the fixed end clamp (1) and the moving end clamp (2), so that the upper surfaces of the fixed end clamp (1) and the moving end clamp (2) are located in the same plane; The flexible sensor clamp for high-temperature test is arranged in axial butt joint mode with the fixed end clamp (1) and the moving end clamp (2); the fixed end clamp (1) is provided with a cylindrical fixed body (11), one end of the fixed body (11) is arranged in axial butt joint mode with an extension body (12), and the end of the extension body (12) is provided with a fixed sensor clamp head (122); the moving end clamp (2) is provided with a cylindrical moving body (21), one end of the moving body (21) is provided with a moving sensor clamp head (23); the outer diameter of the moving body (21) is smaller than the outer diameter of the fixed body (11), and the moving body and the fixed body are coaxial through a moving sample loading auxiliary ring (22).

2. The flexible sensor clamp for high temperature testing loading tool according to claim 1, characterized in that, The fixed end block (6) is provided with a plug-in body (62), and one end of the plug-in body (62) is provided with a fixed clamping block (61); The moving end block (5) is provided with a groove body (51), one end of the groove body (51) is open, and the other end is provided with a moving clamping block (53); The other end of the plug-in body (62) is plugged into the groove body (51) along the open end, and the moving end block (5) is further connected with an extension rod (4).

3. The flexible sensor clamp for high temperature testing loading tool according to claim 1 or 2, characterized in that, A fixed sample loading auxiliary ring (121) is coaxially arranged on the extension body (12), including a first sample loading auxiliary ring (1211) and a second sample loading auxiliary ring (1212) arranged at intervals; The outer diameter of the first sample loading auxiliary ring (1211) is greater than the outer diameter of the second sample loading auxiliary ring (1212), and the first sample loading auxiliary ring (1211) and the second sample loading auxiliary ring (1212) are coaxial.

4. The flexible sensor clamp for high temperature testing of claim 1 or 2, wherein, The fixed sensor clamp head (122) is provided with a first clamp body (1221), the first clamp body (1221) is provided with a first insertion slot (1222) with an open end, and a first fixed hole (1223) is excavated on the side of the first insertion slot (1222).

5. The flexible sensor clamp for high temperature testing of claim 1 or 2, wherein, A counterweight pull ring (13) is arranged at the other end of the fixed body (11); The overall center of gravity of the counterweight pull ring (13) is lower than the axis of the test cavity (7).

6. The flexible sensor clamp for high temperature testing of claim 1 or 2, wherein, A moving sample loading auxiliary ring (22) and a first positioning ring (24) are further arranged at intervals on the moving body (21) behind the moving sensor clamp head (23); A positioning installation unit (25) is arranged at the other end of the moving body (21).

7. The flexible sensor clamp for high temperature testing loading tool according to claim 6, wherein, The moving sensor clamp head (23) is provided with a second clamp body (231), the second clamp body (231) is provided with a second insertion slot (232) with an open end, and a second fixed hole (233) is excavated on the side of the second insertion slot (232).

8. The flexible sensor clamp for high temperature testing loading tool according to claim 6, wherein, The moving sample loading auxiliary ring (22) includes a third sample loading auxiliary ring (221) and a fourth sample loading auxiliary ring (222) arranged at intervals; The outer diameter of the third sample loading auxiliary ring (221) is greater than the outer diameter of the fourth sample loading auxiliary ring (222), and the third sample loading auxiliary ring (221) and the fourth sample loading auxiliary ring (222) are coaxial.

9. The flexible sensor clamp for high temperature testing loading tool according to claim 6, wherein, The positioning and mounting unit (25) is sequentially provided with a second positioning ring (251) and a mounting head (252), and a clamping groove (253) is arranged on the side of the mounting head (252). The first positioning ring (24), the second positioning ring (251) and the moving loading auxiliary ring (22) have the same curvature radius.

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