Alumina fiber composite material flexibility testing device and method

Abstract

The application relates to the technical field of material testing, and discloses an alumina fiber composite material flexibility testing device and method, which comprises a detection frame body, an external roller shaft support is arranged on one side of the detection frame body, and a pay-off roller and a winding roller are rotationally arranged on the external roller shaft support. The cooperation of the elliptical rotating roller arranged in the detection frame body and the double-roller assembly can not only extrude the material to be detected into a limit bending state in the shape of Chinese character 'z', but also continuously rotate the elliptical rotating roller through an external driving mechanism. During the rotation, the material is subjected to periodic upward lifting and downward releasing beating actions. The design simulates the repeated friction, rubbing and vibration load of the material in actual use, overcomes the defect that the traditional technology can only be used for one-time static bending, and makes the test data more reflect the real flexibility life of the material under long-term dynamic working conditions.

Description

Technical Field

[0001] This invention relates to the field of materials testing technology, and in particular to a device and method for testing the flexibility properties of alumina fiber composite materials. Background Technology

[0002] Currently, the main testing methods for the flexibility properties of fiber composites include the three-point bending method, the cantilever beam method, and the manual folding and observation method. These methods typically involve pressing the sample down with two parallel indenters. However, existing technologies have the following technical shortcomings when testing alumina fiber composites, especially continuous long fiber materials with multi-layered stacked structures: Most existing testing devices are designed for static bending of single-layer or short strip samples. However, in actual use of rolled materials, the materials are often in a multi-layer stacked or wound state. The existing static single-point bending cannot simulate the performance degradation of materials under the coexistence of "stacked compression" and "dynamic friction". Existing flexibility tests mostly involve observing whether the material breaks after a single bend, which cannot simulate the repeated rubbing, patting, and vibration alternating stresses that materials experience in actual use. This results in a poor correlation between test results and the actual service life of the material.

[0003] To this end, we designed a device and method for testing the flexibility of alumina fiber composite materials. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that existing flexibility tests mostly observe whether the material breaks after a single bend, which cannot simulate the repeated rubbing, patting and vibration alternating stresses that the material is subjected to in actual use, resulting in a poor correlation between the test results and the actual service life of the material. Therefore, this invention proposes a device and method for testing the flexibility of alumina fiber composite materials.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A device for testing the flexibility of alumina fiber composite materials includes a testing frame body. An external roller support is provided on one side of the testing frame body, and an unwinding roller and a winding roller are rotatably mounted on the external roller support. The same alumina fiber composite material to be tested is wound on the unwinding roller and the winding roller. Multiple insertion holes are provided on both sides of the testing frame body, and the alumina fiber composite material to be tested is stacked in a bent manner in the testing frame body through the insertion holes. Multiple rotating rollers for reversing the conveying of the alumina fiber composite material to be tested are provided on the outer wall of the testing frame body. A detection mechanism for detecting the displacement of the rotating rollers is provided in the testing frame body. The detection frame body is equipped with a double roller assembly and an elliptical rotating roller that move relative to each other in the vertical direction. The double roller assembly consists of two pressing rollers that are close to each other. The elliptical rotating roller pushes the alumina fiber composite material to be tested over the two pressing rollers and drives the elliptical rotating roller to rotate.

[0006] Preferably, the rotating roller slides on both sides of the detection frame body via a telescopic roller frame, and the alumina fiber composite material to be tested is wound on the rotating roller. The detection mechanism includes: a side detection box body, the telescopic roller frame extending and retracting on the side detection box body via a second reset spring, and the rotating roller rotating on the telescopic roller frame.

[0007] Preferably, an electromagnetic generator is also fixed inside the side detection box, and a magnet is provided on the side of the telescopic roller frame facing the electromagnetic generator. A detection sensor connected to the telescopic roller frame is provided on the inner wall of the side detection box.

[0008] Preferably, the detection frame body is provided with two driving components on both the upper and lower sides, and the two driving components are respectively provided with a first lifting plate and a second lifting plate. The double roller assembly and the elliptical rotating roller are respectively set on the first lifting plate and the second lifting plate. The driving component includes an external bracket, and an electric lifting rod is provided on the external bracket. The first lifting plate and the second lifting plate slide relative to each other through the electric lifting rod.

[0009] Preferably, an electric drive bracket is fixed on the second lifting plate, and the elliptical rotating roller rotates on the electric drive bracket, with the major axis distance of the elliptical rotating roller being less than the distance between the two pressing rollers.

[0010] Preferably, the first lifting plate has symmetrical swing grooves on the side facing the alumina fiber composite material to be tested, and fixed shafts are symmetrically arranged in the swing grooves. Swing brackets swing symmetrically on the two fixed shafts, and pressing rollers are arranged at the other end of the swing brackets.

[0011] Preferably, one end of the swing bracket is fixed with a meshing half gear coaxially arranged with the fixed shaft. The meshing half gear is located in the swing groove and protrudes from the first lifting plate. The top of the first lifting plate is provided with a top sliding groove, and a push rack that meshes with the meshing half gear slides symmetrically in the top sliding groove. A first return spring is provided between the two push racks arranged opposite each other, and the first return spring is in a stretched state.

[0012] Preferably, two electric push rods are symmetrically arranged on the top of the first lifting plate, and the output end of the electric push rod is fixed with a triangular push block that slides on the top of the first lifting plate. The triangular push block is an isosceles triangular block, and the triangular push block abuts against the push racks on both sides.

[0013] Preferably, the bottom of the first lifting plate is provided with a rotating groove, the elliptical rotating roller is located below the rotating groove, and the center of the elliptical rotating roller and the center of the rotating groove are located on the same vertical plane.

[0014] A method for testing the flexibility properties of alumina fiber composite materials, the specific method is as follows: S1: First, the alumina fiber composite material to be tested is pulled out from the unwinding roller and then passed through the insertion hole of the detection frame body. The alumina fiber composite material to be tested is in a bent and stacked state. Then, the electromagnetic generator is turned on, and the alumina fiber composite material to be tested is straightened in the detection frame body by rotating the roller. At this time, the position of the telescopic roller frame in the side detection box body is marked as L1 by the detection sensor. S2: Then turn off the electromagnetic generator and turn on the electric lifting rod to slide on the external bracket. When the two pressing rollers and the elliptical rotating roller approach each other, the elliptical rotating roller can push the alumina fiber composite material to be tested to move towards the gap between the two pressing rollers. At this time, the initial bending of the alumina fiber composite material to be tested is achieved. S3: Then the two pressing rollers and the elliptical rotating roller continue to approach each other until the elliptical rotating roller passes the two pressing rollers and stops approaching. This can deepen the bending degree of the alumina fiber composite material to be tested. S4: Then turn on the electric push rod to push the push racks on both sides to slide symmetrically in the top groove. Then turn on the external drive mechanism to drive the elliptical rotating roller to rotate, thereby enabling the operation of the flexibility of the alumina fiber composite material to be tested. S5: Finally, turn on the electric actuator to retract the triangular push block and turn on the electromagnetic generator. The position of the telescopic roller frame inside the side detection box is marked as L2 by the detection sensor. Based on the difference between the two data L1 and L2, the flexibility properties of the alumina fiber composite material to be tested can be obtained.

[0015] The beneficial effects of this invention are as follows: 1. This invention, by setting an elliptical rotating roller and a double roller assembly within the detection frame, can not only compress the material to be tested into a Z-shaped extreme bending state, but also drive the elliptical rotating roller to rotate continuously through an external drive mechanism. During the rotation, the material will be subjected to periodic upward lifting and downward releasing slapping actions. This design simulates the repeated friction, kneading and vibration loads that the material is subjected to in actual use, overcoming the defect of traditional technology that can only perform one-time static bending, so that the test data can better reflect the true flexibility life of the material under long-term dynamic working conditions.

[0016] 2. This invention utilizes unwinding and rewinding rollers in conjunction with multiple interlocking holes to pre-store long strips of alumina fiber composite material to be tested in a bent and stacked form within a frame. This method not only saves the sample cutting time for a single test, allowing the same continuous material to be tested multiple times at multiple points, but also eliminates the interference of the material's own curling stress on the initial state of the test through the straightening action of the telescopic roller frame. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a device for testing the flexibility of alumina fiber composite materials proposed in this invention; Figure 2 This is a side view of a device for testing the flexibility of alumina fiber composite materials proposed in this invention. Figure 3 This is a schematic diagram of the structure of the first lifting plate in the alumina fiber composite material flexibility performance testing device proposed in this invention; Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 This is a front view of the first lifting plate in the alumina fiber composite material flexibility performance testing device proposed in this invention; Figure 6 This is a top view of the first lifting plate in the alumina fiber composite material flexibility performance testing device proposed in this invention. Figure 7 This is a schematic diagram of the side detection box body in the alumina fiber composite material flexibility performance testing device proposed in this invention.

[0018] In the diagram: 1. Detection frame body; 2. External roller support; 3. Unwinding roller; 4. Rewinding roller; 5. Alumina fiber composite material to be tested; 6. Rotating roller; 7. Telescopic roller frame; 8. Side detection box body; 9. First lifting plate; 10. External support; 11. Electric lifting rod; 12. Second lifting plate; 13. Electric drive support; 14. Elliptical rotating roller; 15. Swing support; 16. Pressing roller; 17. Electric push rod; 18. Triangular push block; 19. Push rack; 20. First return spring; 21. Top slide groove; 22. Swing groove; 23. Rotating groove; 24. Fixed shaft; 25. Meshing half gear; 26. Electromagnetic generator; 27. Second return spring; 28. Detection sensor. Detailed Implementation

[0019] Reference Figures 1-7A device for testing the flexibility of alumina fiber composite materials includes a test frame body 1. An external roller support 2 is provided on one side of the test frame body 1, and an unwinding roller 3 and a winding roller 4 are rotatably mounted on the external roller support 2. The same alumina fiber composite material 5 to be tested is wound on the unwinding roller 3 and the winding roller 4. Multiple insertion holes are provided on both sides of the test frame body 1, and the alumina fiber composite material 5 to be tested is bent and stacked in the test frame body 1 through the insertion holes. That is, the alumina fiber composite material 5 to be tested is first pulled out from the unwinding roller 3, then passed through the insertion holes of the test frame body 1, then bypassed the rotating roller 6 on the telescopic roller frame 7 to change direction and re-enter the test frame body 1. After changing direction through multiple rotating rollers 6, the alumina fiber composite material 5 to be tested is in a bent and stacked state.

[0020] Reference Figure 1 and Figure 2 As shown, the alumina fiber composite material 5 to be tested passes through the left insertion hole, the internal space, and the right insertion hole in an “S” shaped path, thus being stored in the detection frame body 1 in a multi-layered bent and stacked state. Multiple rotating rollers 6 are installed on the outer wall of the detection frame body 1. These rotating rollers 6 are used to reverse the conveying of the alumina fiber composite material 5 to be tested, ensuring that the material remains smooth when entering the next layer of insertion holes.

[0021] When it is necessary to test the alumina fiber composite material 5 located inside the test frame body 1, it is only necessary to use the external locking mechanism to lock the unwinding roller 3 and the winding roller 4, so that the unwinding roller 3 and the winding roller 4 are in a stationary state on the external roller shaft support 2.

[0022] The outer wall of the detection frame body 1 is provided with multiple rotating rollers 6 for reversing the conveying of the alumina fiber composite material 5 to be tested. The rotating rollers 6 slide on both sides of the detection frame body 1 through the telescopic roller frame 7. The rotating rollers 6 are not directly fixed to the frame, but are installed in the guide holes on both sides of the detection frame body 1 through the telescopic roller frame 7 to achieve telescopic sliding.

[0023] The alumina fiber composite material 5 to be tested is wound on the rotating roller 6, and a detection mechanism for detecting the displacement of the rotating roller 6 is provided inside the detection frame body 1.

[0024] Reference Figure 7As shown, the detection mechanism includes a side detection box body 8, a telescopic roller frame 7 that extends and retracts on the side detection box body 8 via a second return spring 27, a rotating roller 6 that rotates on the telescopic roller frame 7, and one end of the telescopic roller frame 7 that extends into the side detection box body 8 and abuts against the inner wall of the box via the second return spring 27. Therefore, when there is no external force, the second return spring 27 pushes the telescopic roller frame 7 into a retracted state. A magnet is embedded in one end of the telescopic roller frame 7 located inside the box, and an electromagnetic generator 26 is fixed on the inner wall of the side detection box body 8 opposite to it. A magnet is provided on the side of the telescopic roller frame 7 facing the electromagnetic generator 26. A detection sensor 28 connected to the telescopic roller frame 7 is provided on the inner wall of the side detection box body 8.

[0025] The probe of the detection sensor 28 is mechanically connected to the tail of the telescopic roller frame 7 and is used to record the linear displacement L of the telescopic roller frame 7 in real time. The detection sensor 28 is a laser displacement sensor.

[0026] When the electromagnetic generator 26 is turned on, the telescopic roller frame 7 with magnetic pieces protrudes from the detection frame body 1. Therefore, the telescopic roller frame 7 protruding on both sides of the detection frame body 1 is stretched by the rotating roller 6 to straighten the alumina fiber composite material 5 to be tested in the detection frame body 1. At this time, the position of the telescopic roller frame 7 in the side detection box body 8 is detected and marked as L1 by the detection sensor 28.

[0027] Reference Figure 1 and Figure 2 As shown, the detection frame body 1 has two driving components on both the upper and lower sides, and the two driving components are respectively equipped with a first lifting plate 9 and a second lifting plate 12. The driving component includes an external bracket 10, and an electric lifting rod 11 is provided on the external bracket 10. The first lifting plate 9 and the second lifting plate 12 slide relative to each other through the electric lifting rod 11. The double roller assembly and the elliptical rotating roller 14 are respectively provided on the first lifting plate 9 and the second lifting plate 12, which can realize that the first lifting plate 9 and the second lifting plate 12 move closer or further away relative to each other in the vertical direction.

[0028] Then, the electromagnetic generator 26 is turned off, and the two electric lifting rods 11 on the upper and lower sides of the detection frame body 1 are turned on to slide on the external bracket 10, thereby bringing the first lifting plate 9 and the second lifting plate 12 closer to each other.

[0029] Reference Figures 3-5 As shown, the detection frame body 1 is equipped with a double roller assembly and an elliptical rotating roller 14 that move relative to each other in the vertical direction. An electric drive bracket 13 is fixed on the second lifting plate 12 by screws. The electric drive bracket 13 integrates a micro servo motor. The axis of the elliptical rotating roller 14 is connected to the output shaft of the micro servo motor through a coupling to achieve controlled rotation.

[0030] The double roller assembly consists of two pressing rollers 16 that are close to each other. The elliptical rotating roller 14 pushes the alumina fiber composite material 5 to be tested over the two pressing rollers 16 and drives the elliptical rotating roller 14 to rotate.

[0031] An electric drive bracket 13 is fixed on the second lifting plate 12, and an elliptical rotating roller 14 rotates on the electric drive bracket 13. The major axis distance of the elliptical rotating roller 14 is less than the distance between the two pressing rollers 16. Since the two pressing rollers 16 are set on the first lifting plate 9 through the swing bracket 15, and the elliptical rotating roller 14 is set on the second lifting plate 12 through the electric drive bracket 13, and the major axis distance of the elliptical rotating roller 14 is less than the distance between the two pressing rollers 16, when the two pressing rollers 16 and the elliptical rotating roller 14 approach each other, the elliptical rotating roller 14 can push the alumina fiber composite material 5 to be tested to move toward the gap between the two pressing rollers 16, thus achieving the initial bending of the alumina fiber composite material 5 to be tested.

[0032] Reference Figure 5 As shown, the first lifting plate 9 has symmetrical swing grooves 22 on the side facing the alumina fiber composite material 5 to be tested, and fixed shafts 24 are symmetrically arranged in the swing grooves 22. Swing brackets 15 swing symmetrically on the two fixed shafts 24, and pressing rollers 16 are arranged at the other end of the swing brackets 15, so that the swing brackets 15 can swing around the fixed shafts 24 in the horizontal plane. The two pressing rollers 16 are respectively installed at the ends of the corresponding swing brackets 15 through bearings to form a double roller assembly.

[0033] One end of the swing bracket 15 is fixed with a meshing half gear 25 coaxially arranged with the fixed shaft 24. The meshing half gear 25 is located in the swing groove 22 and protrudes from the first lifting plate 9. The teeth of the meshing half gear 25 protrude upward from the upper surface of the first lifting plate 9.

[0034] The top of the first lifting plate 9 is provided with a top slide groove 21, and a push rack 19 that meshes with the meshing half gear 25 slides symmetrically in the top slide groove 21. A first return spring 20 is provided between the two push racks 19 that are arranged opposite to each other, and the first return spring 20 is in a stretched state.

[0035] Under the action of the electric lifting rod 11, the two pressing rollers 16 and the elliptical rotating roller 14 continue to approach each other until the elliptical rotating roller 14 passes the two pressing rollers 16 and stops approaching. At this position, the alumina fiber composite material 5 to be tested is squeezed into a "Z" shape by the two pressing rollers 16 and the elliptical rotating roller 14, which can deepen the bending degree of the alumina fiber composite material 5 to be tested.

[0036] Two electric actuators 17 are symmetrically arranged on the top of the first lifting plate 9, and the output end of the electric actuator 17 is fixed with a triangular push block 18 that slides on the top of the first lifting plate 9. The triangular push block 18 is an isosceles triangular block, and the triangular push block 18 abuts against the push racks 19 on both sides. When the electric actuator 17 is turned on, it pushes the push racks 19 on both sides to slide symmetrically in the top slide groove 21 with the triangular push block 18. Then, the push racks 19 that slide in opposite directions rotate with the meshing half gears 25 that mesh with each other, thereby causing the swing bracket 15 to move closer to each other and swing in the swing groove 22 with the fixed shaft 24.

[0037] The electric lifting rod 11 continues to drive, and the elliptical rotating roller 14 continues to move upward until the top of the elliptical rotating roller 14 completely crosses the line connecting the centers of the two pressing rollers 16. At this time, the alumina fiber composite material 5 to be tested is tightly squeezed between the outer surface of the elliptical rotating roller 14 and the two pressing rollers 16, forming a bending angle with a very small radius of curvature, simulating the extreme bending condition of the material.

[0038] The bottom of the first lifting plate 9 is provided with a rotating groove 23. The elliptical rotating roller 14 is located below the rotating groove 23, and the center of the elliptical rotating roller 14 and the center of the rotating groove 23 are located on the same vertical plane. Then, the external drive mechanism is activated to drive the elliptical rotating roller 14 to rotate. The rotating elliptical rotating roller 14 can continuously strike the alumina fiber composite material 5 to be tested between the two pressing rollers 16. At this time, the alumina fiber composite material 5 to be tested is in a state of friction and compression under the action of the elliptical rotating roller 14, thereby allowing the flexibility of the alumina fiber composite material 5 to be tested to be manipulated.

[0039] Because the major and minor axes of the elliptical rotating roller 14 alternately contact the surface of the alumina fiber composite material 5 to be tested, the material is subjected to periodic "stretch-release" alternating stress. At the same time, the surface of the elliptical rotating roller 14 rubs against the material. This process is used to simulate the working conditions of the material being repeatedly rubbed, squeezed and rubbed in actual use, in order to test its long-term flexibility retention ability.

[0040] Finally, the electric push rod 17 is activated to retract the triangular push block 18, and the two push racks 19 are reset under the action of the first reset spring 20. Then, the meshing push racks 19 and meshing half gears 25 drive the swing bracket 15 to reset and swing, providing a channel for the elliptical rotating roller 14 to disengage. Under the action of the electric lifting rod 11, the two pressing rollers 16 and the elliptical rotating roller 14 are driven to disengage from the alumina fiber composite material 5 to be tested. Then, the electromagnetic generator 26 is activated, and the telescopic roller frame 7 protruding on both sides is stretched by the rotating roller 6 to straighten the alumina fiber composite material 5 to be tested in the detection frame body 1. At this time, the position of the telescopic roller frame 7 in the side detection box body 8 is detected and marked as L2 by the detection sensor 28.

[0041] Based on the comparison of the differences between the two data points L2 and L1, the flexibility properties of the alumina fiber composite material 5 to be tested are obtained. The displacement difference ΔL = |L2 - L1| is calculated. If ΔL is smaller, it indicates that the material has good resilience after undergoing extreme bending and has not undergone plastic deformation, indicating excellent flexibility. If ΔL is larger, it indicates that the material has undergone irreversible elongation or structural damage, indicating poor flexibility. Through the above steps, this invention completes the automated and quantitative testing of the flexibility properties of alumina fiber composite materials.

[0042] The specific working principle of this invention is as follows: S1: First, the alumina fiber composite material 5 to be tested, which is wound on the unwinding roller 3, is pulled out, then passes through the insertion hole of the detection frame body 1, then goes around the rotating roller 6 on the telescopic roller frame 7 to change direction and re-enters the detection frame body 1. After changing direction through multiple rotating rollers 6, the alumina fiber composite material 5 to be tested is in a bent and stacked state. When it is necessary to test the alumina fiber composite material 5 to be tested located in the detection frame body 1, it is only necessary to use the external snap-fit ​​mechanism to snap the unwinding roller 3 and the take-up roller 4, so that the unwinding roller 3 and the take-up roller 4 are in a stationary state on the external roller shaft support 2. Then, the electromagnetic generator 26 is turned on, and the telescopic roller frame 7 with magnetic pieces protrudes out of the detection frame body 1. Therefore, the telescopic roller frame 7 protruding on both sides of the detection frame body 1 is straightened by the rotating roller 6 and the alumina fiber composite material 5 to be tested located in the detection frame body 1. At this time, the position of the telescopic roller frame 7 in the side detection box body 8 is detected by the detection sensor 28 and marked as L1. S2: Then turn off the electromagnetic generator 26 and turn on the two electric lifting rods 11 on the upper and lower sides of the detection frame body 1 to slide on the external bracket 10, thereby bringing the first lifting plate 9 and the second lifting plate 12 closer to each other. Since the two pressing rollers 16 are set on the first lifting plate 9 through the swing bracket 15 and the elliptical rotating roller 14 is set on the second lifting plate 12 through the electric drive bracket 13, and the major axis distance of the elliptical rotating roller 14 is smaller than the distance between the two pressing rollers 16, when the two pressing rollers 16 and the elliptical rotating roller 14 approach each other, the elliptical rotating roller 14 can push the alumina fiber composite material 5 to be tested to move toward the gap between the two pressing rollers 16, thus achieving the initial bending of the alumina fiber composite material 5 to be tested. S3: Then, under the action of the electric lifting rod 11, the two pressing rollers 16 and the elliptical rotating roller 14 continue to approach each other until the elliptical rotating roller 14 passes the two pressing rollers 16 and stops approaching. At this position, the alumina fiber composite material 5 to be tested is squeezed into a "Z" shape by the two pressing rollers 16 and the elliptical rotating roller 14, which can deepen the bending degree of the alumina fiber composite material 5 to be tested. S4: Then, the electric push rod 17 is turned on, and the triangular push block 18 pushes the push racks 19 on both sides to slide symmetrically in the top slide groove 21. Then, the push racks 19 sliding in opposite directions rotate with the meshing half gears 25, which can make the swing bracket 15 move closer to each other in the swing groove 22. Then, the external drive mechanism is turned on to drive the elliptical rotating roller 14 to rotate. The rotating elliptical rotating roller 14 can continuously hit the alumina fiber composite material 5 to be tested between the two pressing rollers 16. At this time, the alumina fiber composite material 5 to be tested is in a state of friction and compression under the action of the elliptical rotating roller 14, which can manipulate the flexibility of the alumina fiber composite material 5 to be tested. S5: Finally, the electric push rod 17 is activated to retract the triangular push block 18, and the two push racks 19 are reset under the action of the first reset spring 20. Then, the meshing push racks 19 and meshing half gears 25 drive the swing bracket 15 to reset and swing, providing a channel for the elliptical rotating roller 14 to disengage. Under the action of the electric lifting rod 11, the two pressing rollers 16 and the elliptical rotating roller 14 are driven to disengage from the alumina fiber composite material 5 to be tested. Then, the electromagnetic generator 26 is activated, and the telescopic roller frame 7 protruding on both sides is stretched by the rotating roller 6 to straighten the alumina fiber composite material 5 to be tested in the detection frame body 1. At this time, the position of the telescopic roller frame 7 in the side detection box body 8 is detected by the detection sensor 28 and marked as L2. Based on the difference between the two data L2 and L1, the flexibility performance of the alumina fiber composite material 5 to be tested is obtained.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for testing the flexibility of alumina fiber composite materials, comprising a detection frame body (1), an external roller support (2) provided on one side of the detection frame body (1), and an unwinding roller (3) and a winding roller (4) rotatably mounted on the external roller support (2), characterized in that, The same alumina fiber composite material (5) to be tested is wound on the unwinding roller (3) and the winding roller (4). Multiple through holes are provided on both sides of the detection frame body (1), and the alumina fiber composite material (5) to be tested is stacked in a bent manner through the through holes in the detection frame body (1). Multiple rotating rollers (6) for reversing the conveying of the alumina fiber composite material (5) to be tested are provided on the outer wall of the detection frame body (1). A detection mechanism for detecting the displacement of the rotating rollers (6) is provided inside the detection frame body (1). The detection frame body (1) is provided with a double roller assembly and an elliptical rotating roller (14) that move relative to each other in the vertical direction. The double roller assembly consists of two pressing rollers (16) that are close to each other. The elliptical rotating roller (14) pushes the alumina fiber composite material (5) to be tested over the two pressing rollers (16) and drives the elliptical rotating roller (14) to rotate.

2. The alumina fiber composite material flexibility test device according to claim 1, characterized in that, The rotating roller (6) slides on both sides of the detection frame body (1) via the telescopic roller frame (7), and the alumina fiber composite material (5) to be tested is wrapped around the rotating roller (6). The detection mechanism includes: a side detection box body (8), the telescopic roller frame (7) extends and retracts on the side detection box body (8) via the second reset spring (27), and the rotating roller (6) rotates on the telescopic roller frame (7).

3. The alumina fiber composite material flexibility testing device according to claim 2, characterized in that, An electromagnetic generator (26) is fixed inside the side detection box body (8), and a magnet is provided on the side of the telescopic roller frame (7) facing the electromagnetic generator (26). A detection sensor (28) connected to the telescopic roller frame (7) is provided on the inner wall of the side detection box body (8).

4. The alumina fiber composite material flexibility testing device according to claim 3, characterized in that, The detection frame body (1) is provided with two driving components on both the upper and lower sides, and the two driving components are respectively provided with a first lifting plate (9) and a second lifting plate (12). The double roller assembly and the elliptical rotating roller (14) are respectively set on the first lifting plate (9) and the second lifting plate (12). The driving component includes an external bracket (10), and an electric lifting rod (11) is provided on the external bracket (10). The first lifting plate (9) and the second lifting plate (12) slide relative to each other through the electric lifting rod (11).

5. The alumina fiber composite material flexibility test device according to claim 4, characterized in that, An electric drive bracket (13) is fixed on the second lifting plate (12), and an elliptical rotating roller (14) rotates on the electric drive bracket (13). The major axis distance of the elliptical rotating roller (14) is less than the distance between the two pressing rollers (16).

6. The alumina fiber composite material flexibility test device according to claim 5, characterized in that, The first lifting plate (9) is symmetrically provided with swing grooves (22) facing the alumina fiber composite material (5) to be tested, and fixed shafts (24) are symmetrically provided in the swing grooves (22). Swing brackets (15) are symmetrically swinging on the two fixed shafts (24), and pressing rollers (16) are provided at the other end of the swing brackets (15).

7. The alumina fiber composite material flexibility test device according to claim 6, characterized in that, One end of the swing bracket (15) is fixed with a meshing half gear (25) coaxially arranged with the fixed shaft (24). The meshing half gear (25) is located in the swing groove (22) and protrudes from the first lifting plate (9). The top of the first lifting plate (9) is provided with a top slide groove (21), and a push rack (19) that meshes with the meshing half gear (25) slides symmetrically in the top slide groove (21). A first return spring (20) is provided between the two push racks (19) arranged opposite to each other, and the first return spring (20) is in a stretched state.

8. The alumina fiber composite material flexibility test device according to claim 7, characterized in that, Two electric push rods (17) are symmetrically arranged on the top of the first lifting plate (9), and the output end of the electric push rod (17) is fixed with a triangular push block (18) that slides on the top of the first lifting plate (9). The triangular push block (18) is an isosceles triangular block, and the triangular push block (18) abuts against the push racks (19) on both sides.

9. The alumina fiber composite material flexibility test device according to claim 8, characterized in that, The bottom of the first lifting plate (9) is provided with a rotating groove (23), and the elliptical rotating roller (14) is located below the rotating groove (23), and the center of the elliptical rotating roller (14) and the center of the rotating groove (23) are located on the same vertical plane.

10. A method for testing the flexibility properties of alumina fiber composite materials, applied to the alumina fiber composite material flexibility property testing device of claim 9, characterized in that, The specific method is as follows: S1: First, the alumina fiber composite material (5) to be tested, which is wound on the unwinding roller (3), is pulled out and then passed through the insertion hole of the detection frame body (1). The alumina fiber composite material (5) to be tested is in a bent and stacked state. Then, the electromagnetic generator (26) is turned on, and the alumina fiber composite material (5) to be tested is straightened in the detection frame body (1) by rotating the roller (6). At this time, the position of the telescopic roller frame (7) in the side detection box body (8) is detected by the detection sensor (28) and marked as L1. S2: Then turn off the electromagnetic generator (26) and turn on the electric lifting rod (11) to slide on the external bracket (10). When the two pressing rollers (16) and the elliptical rotating roller (14) approach each other, the elliptical rotating roller (14) can push the alumina fiber composite material (5) to be tested to move towards the gap between the two pressing rollers (16), thus realizing the initial bending of the alumina fiber composite material (5) to be tested. S3: Then the two pressing rollers (16) and the elliptical rotating roller (14) continue to approach each other until the elliptical rotating roller (14) passes the two pressing rollers (16) and stops approaching. This can deepen the bending degree of the alumina fiber composite material (5) to be tested. S4: Then turn on the electric push rod (17) and push the push racks (19) on both sides to slide symmetrically in the top groove (21) with the triangular push block (18). Then turn on the external drive mechanism to drive the elliptical rotating roller (14) to rotate, thereby enabling the operation of the flexibility of the alumina fiber composite material (5) to be tested. S5: Finally, turn on the electric push rod (17) to retract the triangular push block (18) and turn on the electromagnetic generator (26). The position of the telescopic roller frame (7) in the side detection box body (8) is detected by the detection sensor (28) and marked as L (2). Based on the difference between the two data L (2) and L (1), the flexibility of the alumina fiber composite material (5) to be tested is obtained.

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