Nickel alloy pipe vibration fatigue life test device

Abstract

The utility model discloses a nickel alloy pipe vibration fatigue life test device, which comprises a mounting frame, a movable frame and a movable seat, the movable frame and the movable seat are both slidably connected with the mounting frame, the movable frame and the movable seat are vertically distributed, an electromagnetic vibration exciter is arranged on the movable frame, a fixed frame is rotatably mounted on the movable seat, and the fixed frame is provided with a plurality of electromagnetic vibration exciters. Two groups of symmetrically distributed adjusting seats are slidably mounted in the fixing frame, a bidirectional screw rod is rotatably mounted in the fixing frame, positioning seats are rotatably mounted on the two groups of adjusting seats, turntables are rotatably mounted in the positioning seats, toothed rings sleeve the turntables, and second racks are slidably mounted in the positioning seats; three sets of annularly-distributed adjusting blocks are arranged on the positioning base, annular teeth are fixedly installed on the rotating disc, nickel alloy pipes with different pipe diameters can be rapidly fixed, installed and disassembled through the three sets of clamping rods capable of synchronously moving inwards or outwards on the positioning base, and the application range of the experiment device is effectively expanded.

Description

A vibration fatigue life testing device for nickel alloy tubes Technical Field

[0001] This utility model relates to the field of nickel alloy tube technology, specifically to a device for testing the vibration fatigue life of nickel alloy tubes. Background Technology

[0002] Nickel alloy tubes are high-performance solid solution strengthened nickel-based wrought high-temperature alloy tubes, mainly composed of elements such as nickel, chromium, molybdenum, and niobium, and containing certain amounts of elements such as iron, aluminum, and titanium. Due to their excellent corrosion resistance, oxidation resistance, and high strength, nickel alloy tubes are widely used in aerospace, chemical, and oil extraction fields. These components often endure complex alternating loads (such as high-frequency vibration and thermal stress coupling) during service, and their fatigue life directly affects equipment reliability. Vibration fatigue life testing is the core method for evaluating the performance of nickel alloy tubes.

[0003] Existing testing equipment is mostly designed for pipes of specific sizes. As mentioned in the literature, traditional pipe vibration fatigue test benches can only be used for pipes with a single outer diameter. Moreover, the actual operating conditions of nickel alloy pipes in engines often involve multi-directional vibration. Existing equipment mostly uses fixed clamps, which can improve coaxiality to a certain extent, but cannot adjust the clamping angle, resulting in a large deviation between the stress distribution and the actual operating conditions. Furthermore, existing testing methods require manual marking of test points and stress testing in different areas by changing clamps or adjusting the position of the sample. This results in multiple disassembly and assembly of a single sample, making the experiment time-consuming. Summary of the Invention

[0004] The purpose of this invention is to provide a device for testing the vibration fatigue life of nickel alloy tubes, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a vibration fatigue life testing device for nickel alloy tubes, comprising a mounting frame, a movable frame, and a movable base. Both the movable frame and the movable base are slidably connected to the mounting frame. The movable frame and the movable base are vertically distributed. An electromagnetic vibrator is mounted on the movable frame. A first lead screw and a second lead screw are rotatably mounted inside the mounting frame. A fixed frame is rotatably mounted on the movable base. Two sets of symmetrically distributed adjusting seats are slidably mounted inside the fixed frame. A bidirectional... The screw has a positioning seat rotatably mounted on each of the two sets of adjusting seats. A turntable is rotatably mounted inside the positioning seat, and a toothed ring is sleeved on the turntable. A second rack is slidably mounted inside the positioning seat. The positioning seat has three sets of annularly distributed adjusting blocks, all of which are slidably connected to the positioning seat. Annular teeth are fixedly mounted on the turntable, and the three sets of adjusting blocks are meshed with the turntable through the annular teeth. Clamping rods are fixedly mounted on each of the three sets of adjusting blocks. The fixed frame is rotatably connected to the moving seat, and the positioning seat is rotatably connected to the adjusting seat through a mounting shaft.

[0006] As a further preferred embodiment of this technical solution, the second lead screw is perpendicular to the first lead screw, the first lead screw passes through the movable frame and is threadedly connected to the movable frame, and the second lead screw passes through the movable seat and is threadedly connected to the movable seat.

[0007] As a further preferred embodiment of this technical solution, the two ends of the bidirectional lead screw pass through two sets of adjusting seats and are threadedly connected to the two sets of adjusting seats respectively. A second cylinder is fixedly installed inside the positioning seat. The second rack is meshed with the gear ring. The second rack is fixedly connected to the output end of the piston rod of the second cylinder. Two sets of symmetrically distributed vacuum suction cups are fixedly embedded on the clamping rod. Pressure sensors are fixedly installed on all three sets of clamping rods.

[0008] As a further preferred embodiment of this technical solution, a first gear is sleeved on the fixed frame, a first rack is slidably installed in the movable seat, the first rack is meshed with the first gear, a first cylinder is fixedly installed in the movable seat, and the first rack is fixedly connected to the output end of the piston rod of the first cylinder.

[0009] As a further preferred embodiment of this technical solution, two sets of symmetrically distributed ratchet wheels are sleeved on the mounting shaft, and two sets of pawls that mesh with the ratchet wheels are provided in the adjusting seat. Both sets of pawls are rotatably connected to the adjusting seat through rotating rods. A first torsion spring is sleeved on the rotating rod, and the two ends of the first torsion spring are fixedly connected to the pawls and the adjusting seat, respectively. A second gear is sleeved on both sets of rotating rods, and two sets of third racks that are connected to the second gears are provided in the adjusting seat.

[0010] As a further preferred embodiment of this technical solution, a connecting frame is slidably installed inside the adjusting seat. The connecting frame is fixedly connected to two sets of third racks respectively. A locking block is fixedly installed on the connecting frame. A locking rod corresponding to the locking block is fixedly installed inside the adjusting seat. Two sets of symmetrically distributed locking brackets are sleeved on the locking rods. The two sets of locking brackets are movably locked with the locking block.

[0011] As a further preferred embodiment of this technical solution, two sets of symmetrically distributed second torsion springs are sleeved on the clamp rod, and the two ends of the second torsion springs are respectively fixedly connected to the corresponding clamp frame and clamp rod.

[0012] This invention provides a device for testing the vibration fatigue life of nickel alloy tubes, which has the following advantages:

[0013] (1) This utility model achieves rapid installation and disassembly of nickel alloy tubes of different diameters by using three sets of clamping rods on the positioning seat that can move synchronously inward or outward, effectively expanding the applicable range of the experimental device. In the process of the second cylinder in the positioning seat driving the second rack to slide, the gear ring drives the turntable and the ring teeth on the turntable to rotate. Under the limiting action of the positioning seat, the three sets of adjusting blocks connected to the turntable by the ring teeth drive the three sets of clamping rods to move synchronously inward or outward until the clamping rods are in contact with the inner wall of the nickel alloy tube waiting to be tested. The vacuum suction cup is connected to the vacuum generating device through the pipe, and a certain negative pressure suction force is applied to the inner wall of the nickel alloy tube on the basis of the clamping force of the clamping rods, which strengthens the clamping strength of the nickel alloy tube. The pressure sensor monitors the squeezing force on the nickel alloy tube in real time to avoid deformation of the nickel alloy tube.

[0014] (2) This utility model achieves adjustment of the experimental position of the fixed nickel alloy tube by rotating the fixed frame on the moving seat in conjunction with rotating the positioning seat on the adjusting seat. This eliminates the need for frequent disassembly and reassembly of the nickel alloy tube under different experimental requirements, thus avoiding slow experimental progress and complex experimental steps. It also avoids deviations in the experimental position. The first cylinder in the moving seat is activated, causing the first rack to slide, which, in conjunction with the first gear, causes the fixed frame to rotate the fixed nickel alloy tube. Simultaneously, the connecting frame drives two sets of third racks to slide, which, in conjunction with two sets of second gears, causes two sets of rotating rods to deflect two sets of pawls, releasing the tube. In addition to engaging the ratchet, the mounting shaft also clamps the block with two sets of clips to fix the position of the connecting frame. At this time, the mounting shaft can drive the positioning seat to rotate freely on the adjusting seat. According to the actual experimental requirements, the mounting shaft rotates the positioning seat and the nickel alloy tube fixed on the positioning seat to adjust the experimental position of the nickel alloy tube under the fixed condition. After the adjustment is completed, the two sets of clips are released from fixing the block. Under the action of the first torsion spring, the two sets of pawls return to the original meshing connection with the ratchet. Under the position limitation of the two sets of ratchets and pawls, the mounting shaft cannot rotate, that is, the positioning seat and the nickel alloy tube fixed above are stable during the experiment. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 is a schematic diagram showing the structural separation of the mounting frame and the movable frame of this utility model;

[0017] Figure 3 is a schematic diagram showing the separation of the movable base and the fixed frame of this utility model;

[0018] Figure 4 is a schematic diagram showing the structural separation of the adjustment seat and the positioning seat of this utility model;

[0019] Figure 5 is an enlarged view of the structure at point A in Figure 4 of this utility model;

[0020] Figure 6 is a schematic diagram showing the separation of the positioning seat and clamping rod of this utility model;

[0021] In the diagram: 1. Mounting bracket; 2. Moving bracket; 3. First lead screw; 4. Electromagnetic vibrator; 5. Moving seat; 6. Second lead screw; 7. Fixed bracket; 8. Adjusting seat; 9. Bidirectional lead screw; 10. First gear; 11. First rack; 12. First cylinder; 13. Positioning seat; 14. Mounting shaft; 15. Ratchet; 16. Pawl; 17. Rotating rod; 18. First torsion spring; 19. Second gear; 20. Third rack; 21. Connecting bracket; 22. Locking block; 23. Locking rod; 24. Locking frame; 25. Second torsion spring; 26. Turntable; 27. Gear ring; 28. Second rack; 29. ​​Second cylinder; 30. Ring gear; 31. Adjusting block; 32. Clamping rod; 33. Vacuum suction cup; 34. Pressure sensor. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0023] This utility model provides a technical solution: As shown in Figures 1-6, in this embodiment, a nickel alloy tube vibration fatigue life testing device includes a mounting frame 1, a movable frame 2, and a movable seat 5. The movable frame 2 and the movable seat 5 are slidably connected to the mounting frame 1. The movable frame 2 and the movable seat 5 are vertically distributed. An electromagnetic vibrator 4 is provided on the movable frame 2. A first lead screw 3 and a second lead screw 6 are rotatably installed inside the mounting frame 1. A fixed frame 7 is rotatably installed on the movable seat 5. Two sets of symmetrically distributed adjusting seats 8 are slidably installed inside the fixed frame 7. A bidirectional lead screw 9 is rotatably installed inside the fixed frame 7. A positioning seat 13 is rotatably installed on each of the two sets of adjusting seats 8. A turntable 26 is rotatably mounted inside the positioning seat 13. A toothed ring 27 is sleeved on the turntable 26. A second rack 28 is slidably mounted inside the positioning seat 13. The positioning seat 13 is provided with three sets of annularly distributed adjusting blocks 31, all three sets of adjusting blocks 31 being slidably connected to the positioning seat 13. Annular teeth 30 are fixedly mounted on the turntable 26, and the three sets of adjusting blocks 31 are all meshed with the turntable 26 through the annular teeth 30. Clamping rods 32 are fixedly mounted on each of the three sets of adjusting blocks 31. The fixed frame 7 is rotatably connected to the movable seat 5. The positioning seat 13 is rotatably connected to the adjusting seat 8 through the mounting shaft 14. The second lead screw 6 is perpendicular to the first lead screw 3. The first lead screw 3 passes through the movable frame 2 and is connected to the movable seat 8. The moving frame 2 is threadedly connected, and the second lead screw 6 passes through the moving seat 5 and is threadedly connected to the moving seat 5. The two ends of the bidirectional lead screw 9 pass through two sets of adjusting seats 8 respectively and are threadedly connected to the two sets of adjusting seats 8 respectively. The second cylinder 29 is fixedly installed inside the positioning seat 13. The second rack 28 is meshed with the gear ring 27. The second rack 28 is fixedly connected to the output end of the piston rod of the second cylinder 29. Two sets of symmetrically distributed vacuum suction cups 33 are fixedly embedded on the clamping rod 32. Pressure sensors 34 are fixedly installed on all three sets of clamping rods 32. The three sets of clamping rods 32 on the positioning seat 13, which can move synchronously inward or outward, realize the rapid fixing, installation and disassembly of nickel alloy tubes of different diameters, effectively expanding the scope of the experiment. The device is applicable in the following situations: the second cylinder 29 in the positioning seat 13 drives the second rack 28 to slide, and the gear ring 27 drives the turntable 26 and the ring teeth 30 on the turntable 26 to rotate. Under the limiting action of the positioning seat 13, the three sets of adjusting blocks 31 connected to the turntable 26 by the ring teeth 30 drive the three sets of clamping rods 32 to move inward or outward synchronously until the clamping rods 32 are in contact with the inner wall of the nickel alloy tube waiting to be tested. The vacuum suction cup 33 is connected to the vacuum generating device through the pipe. On the basis of the clamping force of the clamping rods 32, a certain negative pressure suction force is applied to the inner wall of the nickel alloy tube to strengthen the clamping strength of the nickel alloy tube. The pressure sensor 34 monitors the extrusion pressure on the nickel alloy tube in real time to avoid deformation of the nickel alloy tube.

[0024] As shown in Figures 2-5, a first gear 10 is sleeved on the fixed frame 7, a first rack 11 is slidably installed in the movable seat 5, and the first rack 11 is meshed with the first gear 10. A first cylinder 12 is fixedly installed in the movable seat 5, and the first rack 11 is fixedly connected to the output end of the piston rod of the first cylinder 12. Two sets of symmetrically distributed ratchet wheels 15 are sleeved on the mounting shaft 14. Two sets of pawls 16 that mesh with the ratchet wheels 15 are provided in the adjusting seat 8. Both sets of pawls 16 are rotatably connected to the adjusting seat 8 through a rotating rod 17. A first torsion spring 18 is sleeved on the rotating rod 17, and the two ends of the first torsion spring 18 are fixedly connected to the pawls 16 and the adjusting seat 8, respectively. Each rotating rod 17 is fitted with a second gear 19. The adjusting seat 8 contains two sets of third racks 20 connected to the second gears 19. A connecting frame 21 is slidably installed inside the adjusting seat 8, and the connecting frame 21 is fixedly connected to each of the two sets of third racks 20. A locking block 22 is fixedly installed on the connecting frame 21. A locking rod 23 corresponding to the locking block 22 is fixedly installed inside the adjusting seat 8. Two sets of symmetrically distributed locking brackets 24 are fitted onto the locking rod 23, and the two sets of locking brackets 24 are movably engaged with the locking block 22. Two sets of symmetrically distributed second torsion springs 25 are fitted onto the locking rod 23, and the two ends of the second torsion springs 25 are fixedly connected to the corresponding locking brackets 24 and locking rods 23, respectively. The rotation of the frame 7 on the movable seat 5, in conjunction with the rotation of the positioning seat 13 on the adjusting seat 8, allows for the adjustment of the experimental position of the fixed nickel alloy tube. This eliminates the need for frequent disassembly and reassembly of the nickel alloy tube under different experimental requirements, thus avoiding slow experimental progress and complex experimental procedures. It also prevents deviations in the experimental position. The first cylinder 12 in the movable seat 5 is activated, causing the first rack 11 to slide. This, in conjunction with the first gear 10, causes the fixed frame 7 to rotate the fixed nickel alloy tube. Simultaneously, the connecting frame 21 drives the two sets of third racks 20 to slide, which, in conjunction with the two sets of second gears 19, causes the two sets of rotating rods 17 to deflect the two sets of pawls 16, releasing the ratchet 15 and allowing... The two sets of clamping brackets 24 clamp the clamping block 22 to fix the position of the connecting frame 21. At this time, the mounting shaft 14 can drive the positioning seat 13 to rotate freely on the adjusting seat 8. According to the actual experimental requirements, the positioning seat 13 and the nickel alloy tube fixed on the positioning seat 13 are rotated by the mounting shaft 14 to adjust the experimental position of the nickel alloy tube under the fixed condition. After the adjustment is completed, the two sets of clamping brackets 24 are released from fixing the clamping block 22. Under the action of the first torsion spring 18, the two sets of pawls 16 return to the original meshing connection state with the ratchet 15. Under the position limitation of the two sets of ratchet 15 and pawls 16, the mounting shaft 14 cannot rotate, that is, the positioning seat 13 and the nickel alloy tube fixed above it are stable during the experiment.

[0025] This utility model provides a vibration fatigue life testing device for nickel alloy tubes. The specific working principle is as follows: Three sets of clamping rods 32 on the positioning seat 13, which can move synchronously inwards or outwards, enable rapid fixing, installation, and disassembly of nickel alloy tubes of different diameters, effectively expanding the applicability of the testing device. During the sliding process of the second cylinder 29 driving the second rack 28 within the positioning seat 13, the gear ring 27 drives the turntable 26 and the annular teeth 30 on the turntable 26 to rotate. Under the limiting action of the positioning seat 13, the three sets of adjusting blocks 31, connected to the turntable 26 via the annular teeth 30, drive the three sets of clamping rods 32. The clamping rod 32 moves synchronously inward or outward until it adheres to the inner wall of the nickel alloy tube awaiting the experiment. The vacuum suction cup 33, connected to the vacuum generator via a pipe, applies a certain negative pressure suction to the inner wall of the nickel alloy tube based on the clamping force of the clamping rod 32, strengthening the clamping strength. The pressure sensor 34 monitors the compressive force on the nickel alloy tube in real time to prevent deformation. The rotation of the fixing frame 7 on the moving seat 5, combined with the rotation of the positioning seat 13 on the adjusting seat 8, allows for adjustment of the experimental position of the fixed nickel alloy tube, eliminating the need for frequent adjustments by operators under different experimental requirements. The disassembly and assembly of the nickel alloy tube resulted in slow experimental progress and complex experimental steps. To avoid deviations in experimental positions, the first cylinder 12 in the moving seat 5 is activated, causing the first rack 11 to slide. This, in conjunction with the first gear 10, causes the fixing frame 7 to rotate the fixed nickel alloy tube. Simultaneously, the connecting frame 21 drives the two sets of third racks 20 to slide, which, in conjunction with the two sets of second gears 19, causes the two sets of rotating rods 17 to deflect the two sets of pawls 16, releasing the ratchet 15. The two sets of clamping brackets 24 then hold the clamping block 22, fixing the position of the connecting frame 21. At this point, the installation... Shaft 14 can drive positioning seat 13 to rotate freely on adjusting seat 8. According to the actual experimental requirements, by rotating positioning seat 13 and nickel alloy tube fixed on positioning seat 13 through mounting shaft 14, the experimental position of nickel alloy tube under fixed condition can be adjusted. After the adjustment is completed, the two sets of clamps 24 are released from fixing of clamp block 22. Under the action of first torsion spring 18, the two sets of pawls 16 return to the original meshing connection state with ratchet 15. Under the position limitation of the two sets of ratchet 15 and pawl 16, mounting shaft 14 cannot rotate, that is, positioning seat 13 and nickel alloy tube fixed above are stable during the experiment.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vibration fatigue life testing device for nickel alloy tubes, comprising a mounting frame (1), a movable frame (2), and a movable base (5), characterized in that: The movable frame (2) and the movable seat (5) are slidably connected to the mounting frame (1). The movable frame (2) and the movable seat (5) are vertically distributed. An electromagnetic vibrator (4) is provided on the movable frame (2). A first lead screw (3) is rotatably installed in the mounting frame (1). A second lead screw (6) is rotatably installed in the mounting frame (1). A fixed frame (7) is rotatably installed on the movable seat (5). Two sets of symmetrically distributed adjusting seats (8) are slidably installed in the fixed frame (7). A bidirectional lead screw (9) is rotatably installed in the fixed frame (7). A positioning seat (13) is rotatably installed on each of the two sets of adjusting seats (8). A turntable (2) is rotatably installed in the positioning seat (13). 6) A toothed ring (27) is sleeved on the turntable (26), a second rack (28) is slidably installed in the positioning seat (13), and three sets of annularly distributed adjusting blocks (31) are provided on the positioning seat (13). All three sets of adjusting blocks (31) are slidably connected to the positioning seat (13). Annular teeth (30) are fixedly installed on the turntable (26), and all three sets of adjusting blocks (31) are meshed with the turntable (26) through the annular teeth (30). Clamping rods (32) are fixedly installed on all three sets of adjusting blocks (31). The fixed frame (7) is rotatably connected to the moving seat (5), and the positioning seat (13) is rotatably connected to the adjusting seat (8) through the mounting shaft (14).

2. The nickel alloy tube vibration fatigue life testing device according to claim 1, characterized in that: The second lead screw (6) is perpendicular to the first lead screw (3). The first lead screw (3) passes through the movable frame (2) and is threadedly connected to the movable frame (2). The second lead screw (6) passes through the movable seat (5) and is threadedly connected to the movable seat (5).

3. The vibration fatigue life testing device for nickel alloy tubes according to claim 1, characterized in that: The two ends of the bidirectional lead screw (9) pass through two sets of adjusting seats (8) respectively and are threadedly connected to the two sets of adjusting seats (8). The second cylinder (29) is fixedly installed in the positioning seat (13). The second rack (28) is meshed with the toothed ring (27). The second rack (28) is fixedly connected to the output end of the piston rod of the second cylinder (29). Two sets of symmetrically distributed vacuum suction cups (33) are fixedly embedded on the clamping rod (32). Pressure sensors (34) are fixedly installed on all three sets of clamping rods (32).

4. The nickel alloy tube vibration fatigue life testing device according to claim 1, characterized in that: The fixed frame (7) is fitted with a first gear (10), and a first rack (11) is slidably installed in the movable seat (5). The first rack (11) is meshed with the first gear (10). A first cylinder (12) is fixedly installed in the movable seat (5), and the first rack (11) is fixedly connected to the output end of the piston rod of the first cylinder (12).

5. The vibration fatigue life testing device for nickel alloy tubes according to claim 1, characterized in that: Two sets of symmetrically distributed ratchet wheels (15) are sleeved on the mounting shaft (14). The adjusting seat (8) is provided with two sets of pawls (16) that mesh with the ratchet wheels (15). Both sets of pawls (16) are rotatably connected to the adjusting seat (8) through a rotating rod (17). A first torsion spring (18) is sleeved on the rotating rod (17). The two ends of the first torsion spring (18) are fixedly connected to the pawls (16) and the adjusting seat (8) respectively. A second gear (19) is sleeved on both sets of rotating rods (17). The adjusting seat (8) is provided with two sets of third racks (20) that are connected to the second gears (19).

6. The device for testing the vibration fatigue life of a nickel alloy tube according to claim 1, characterized in that: A connecting frame (21) is slidably installed inside the adjusting seat (8). The connecting frame (21) is fixedly connected to two sets of third racks (20). A locking block (22) is fixedly installed on the connecting frame (21). A locking rod (23) corresponding to the locking block (22) is fixedly installed inside the adjusting seat (8). Two sets of symmetrically distributed locking brackets (24) are sleeved on the locking rod (23). The two sets of locking brackets (24) are movably locked with the locking block (22).

7. The nickel alloy tube vibration fatigue life testing device according to claim 6, characterized in that: Two sets of symmetrically distributed second torsion springs (25) are sleeved on the lever (23), and the two ends of the second torsion springs (25) are fixedly connected to the corresponding bracket (24) and lever (23) respectively.

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