A device for crack propagation of material fatigue
Patent Information
- Application Number
- CN202521851876.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-29
- Publication Date
- 2026-09-11
- Estimated Expiration
- 2035-08-29
AI Technical Summary
[0004]为了解决现有技术中存在的缺少对横梁按压导致在疲劳检测中，需借助其他工具，存在操作繁琐，工作效率低下等缺点的问题，本实用新型提供了一种用于材料疲劳的裂纹扩展装置，采用了如下技术方案：疲劳裂纹拓展单元、第一导向转盘、缠绕盘、伺服电机、牵引绳、L形板和金属板，其中L形板中支撑板部的下部固定有伺服电机，伺服电机的动力输出与缠绕盘固定，缠绕盘与牵引绳的中央固定，牵引绳的中部缠绕在缠绕盘上；牵引绳的两端分别与疲劳裂纹拓展单元的一个从齿轮的外端固定，疲劳裂纹拓展单元对称安装在L形板的支撑板部；第一导向转盘设置在牵引绳两端与从齿轮固定的部分到与缠绕盘连接的部分之间；
[0013] 1. In this utility model, the servo motor pulls two sets of clamping plates through the traction rope, gear, T-block and bidirectional threaded rod to cause fatigue cracks in the metal plate to simulate the failure of tensile fatigue fracture.
Smart Images
Figure CN224744694U_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of metal fatigue detection technology, specifically a crack propagation device for material fatigue. Background Technology
[0002] Currently, prefabricated steel structure building systems are being used more and more widely in construction. In order to ensure the safety of steel structure beams, testing devices are needed to test their resistance to metal fatigue during the production process of steel structure beams.
[0003] When using existing testing equipment to test the metal fatigue resistance of steel structure beams, the process involves placing the beam on the device, pressing it down with other tools, then repeatedly bending the beam with a bending machine while the operator records the number of bends. After the beam breaks, the bending machine is turned off and the tools and beam are removed. This method has drawbacks: the testing device itself is difficult to press down on the beam, requiring the use of other tools, which is cumbersome and leads to low work efficiency. Therefore, it is necessary to propose a crack propagation mechanism for material fatigue. Utility Model Content
[0004] To address the shortcomings of existing technologies, such as the lack of crossbeam pressing, which necessitates the use of additional tools during fatigue testing, resulting in cumbersome operation and low efficiency, this invention provides a crack propagation device for material fatigue. The device comprises a fatigue crack propagation unit, a first guide turntable, a winding disc, a servo motor, a traction rope, an L-shaped plate, and a metal plate. The servo motor is fixed to the lower part of the support plate of the L-shaped plate, and its power output is fixed to the winding disc. The winding disc is fixed to the center of the traction rope, and the middle part of the traction rope is wound around the winding disc. Both ends of the traction rope are fixed to the outer end of a follower gear of the fatigue crack propagation unit. The fatigue crack propagation unit is symmetrically installed on the support plate of the L-shaped plate. The first guide turntable is positioned between the portions of the traction rope fixed to the follower gears and the portions connected to the winding disc.
[0005] The fatigue crack propagation unit includes: a dual-axis motor, a rotating shaft, a sliding rod, a T-block, a driven gear, a clamping plate assembly, a fixed plate, and a bidirectional threaded rod. Two fixed plates are respectively fixedly connected to the two sides of the upper part of the support plate in the L-shaped plate. The sliding rod passes through the opening in the center of the fixed plate and is fitted with a clearance fit. The inner side of the sliding rod is fixed to the fixed plate part of the T-block, and the opening part of the T-block is fixed to the inner side of the fixed plate part. The smooth rod in the center of the bidirectional threaded rod passes through the opening part of the T-block, allowing the bidirectional threaded rod to rotate freely within the opening part. The threaded parts at both ends of the bidirectional threaded rod are respectively threadedly connected to one of the clamping plates in the two clamping plate assemblies. The locking strip in the center of the clamping plate assembly engages with the locking grooves at the upper and lower ends of the metal plate. When the reverse-direction threaded parts at both ends of the bidirectional threaded rod rotate, they drive the two clamping plate assemblies to clamp the metal plate.
[0006] Each sliding rod has a driven gear coaxially fixed on its outer end face. The driven gear meshes with the main gear. The two main gears are connected to one of the power output shafts of the dual-axis motor through rotating shafts. The two power output shafts of the dual-axis motor rotate in opposite directions.
[0007] The base of the L-shaped board is placed on the table.
[0008] The power output shaft of the dual-axis motor is connected to the corresponding rotating shaft via a connecting pipe.
[0009] The thickness of the primary gear is different from that of the driven gear.
[0010] A second guide turntable is also provided between the first guide turntable and the winding turntable for the traction rope.
[0011] The outer peripheries of both the first and second guide turntables are in contact with the traction rope.
[0012] The beneficial effects of this utility model are as follows:
[0013] 1. In this utility model, the servo motor pulls two sets of clamping plates through the traction rope, gear, T-block and bidirectional threaded rod to cause fatigue cracks in the metal plate to simulate the failure of tensile fatigue fracture.
[0014] The dual-axis motor drives two sets of clamping plates to rotate through the shaft, main gear, driven gear, T-block and bidirectional threaded rod, causing the metal plate to twist and produce fatigue cracks to simulate the failure of bending fatigue fracture.
[0015] Since tensile fatigue is applied through the traction rope and bending fatigue is applied through the main gear, rotation does not interfere with the tension of the traction rope, so the two failure modes do not interfere with each other.
[0016] 2. In this utility model, the design of the main gear driving two slave gears to flip in opposite directions causes the sliding rod to drive the clamping plate assembly to produce a specific movement. This movement mode can more sensitively produce the subtle deformation of the metal plate caused by the expansion of bending fatigue cracks; making the force conditions for the initiation and expansion of cracks in such materials more precise.
[0017] 3. In this utility model, the metal plate can be stably clamped by the cooperation of the fixed plate, sliding rod, T-block and clamping plate assembly, ensuring that the device is in close contact with the metal plate during the monitoring process and reducing the monitoring error caused by relative displacement; at the same time, it is simple to operate, has high work efficiency and strong practicality. Attached Figure Description
[0018] Figure 1 This is an overall structural schematic diagram of an embodiment of a crack propagation device for material fatigue according to the present invention.
[0019] Figure 2 This is a schematic diagram of the overall side view structure of this utility model;
[0020] Figure 3 for Figure 1 Enlarged schematic diagram of the structure at point A in the middle;
[0021] Figure 4 for Figure 2 Enlarged schematic diagram of the structure at point B.
[0022] In the diagram: 1. L-shaped plate; 2. Fixed plate; 3. Sliding rod; 4. T-shaped block; 5. Bidirectional threaded rod; 6. Clamping plate assembly; 7. Metal plate; 8. Driven gear; 9. Traction rope; 10. Winding disc; 11. Servo motor; 12. First guide turntable; 13. Second guide turntable; 14. Connecting pipe; 15. Dual-axis motor; 16. Rotating shaft; 17. Main gear. Detailed Implementation
[0023] The present invention will be further described in detail below with reference to the accompanying drawings.
[0024] like Figure 1 and Figure 2 The embodiment of this utility model shown includes: a fatigue crack propagation unit, a first guide turntable 12, a winding disc 10, a servo motor 11, a traction rope 9, an L-shaped plate 1, and a metal plate 7 for simulating a crossbeam. The servo motor 11 is fixed to the lower part of the support plate portion of the L-shaped plate 1. The power output of the servo motor 11 is fixed to the winding disc 10. The winding disc 10 is fixed to the center of the traction rope 9, and the middle part of the traction rope 9 is wound around the winding disc 10. Both ends of the traction rope 9 are respectively fixed to the outer end of one of the follower gears 8 of the fatigue crack propagation unit. The fatigue crack propagation unit is symmetrically installed in the upper middle part of the support plate portion of the L-shaped plate 1, with the symmetrical plane being the vertical plane through which the power output of the servo motor passes. The metal plate 7 is clamped between two sets of clamping plate groups 6 of the fatigue crack propagation unit. The bottom plate portion of the L-shaped plate 1 is placed on a tabletop, and the bottom plate portion and the support plate portion are fixedly connected at a 90° angle to form the L-shaped plate 1.
[0025] A first guide disc 12 is provided between the two ends of the traction rope 9 and the part fixed to the gear 8 and the part connected to the winding disc 10. The first guide disc 12 is installed on the upper part of the support plate in the L-shaped plate 1. The traction rope 9 leaving the winding disc 10 passes around the first guide disc 12 and is fixed to the gear 8. The start of the servo motor 11 will drive the winding disc 10 to rotate, which is used to simulate the fatigue cracks generated when the metal plate 7 is subjected to horizontal tension.
[0026] In this embodiment, a second guide turntable 13 is provided between the first guide turntable 12 and the winding turntable 10. The outer periphery of both the first guide turntable 12 and the second guide turntable 13 are in contact with the traction rope 9, thereby mainly guiding the traction rope 9 and keeping the direction of the applied tension parallel to the metal plate 7 as much as possible.
[0027] like Figures 1-4 The fatigue crack propagation unit shown includes: a dual-axis motor 15, a rotating shaft 16, a sliding rod 3, a T-block 4, a driven gear 8, a clamping plate assembly 6, a fixing plate 2, and a bidirectional threaded rod 5, wherein...
[0028] Two fixed plates 2 are respectively fixedly connected to the upper sides of the support plate part of the L-shaped plate 1. The sliding rod 3 passes through the opening in the center of the fixed plate 2 and is fitted with the opening gap (it can slide left and right and rotate). The inner side of the sliding rod 3 is fixed to the fixed plate part of the T-shaped block 4. The opening part of the T-shaped block 4 is fixed to the inner side of the fixed plate part. The smooth rod part in the center of the bidirectional threaded rod 5 passes through the opening part of the T-shaped block 4, so that the bidirectional threaded rod 5 can rotate freely in the opening part. The threaded parts at both ends of the bidirectional threaded rod 5 are respectively connected to one of the clamping plates in the two sets of clamping plate groups 6 by threads. The locking strip in the center of the clamping plate group 6 is fitted with the locking grooves at the upper and lower ends of the metal plate 7. So when the reverse threaded parts at both ends of the bidirectional threaded rod 5 rotate, they will drive the two sets of clamping plate groups 6 to clamp the metal plate 7.
[0029] Each sliding rod 3 has a driven gear 8 coaxially fixed on its outer end face (the side away from the T-block 4). The driven gear 8 meshes with the main gear 17, which is located in the middle of the support plate in the L-shaped plate 1. The two main gears 17 are connected to one power output shaft of the dual-axis motor 15 through the rotating shaft 16. The two power output shafts of the dual-axis motor 15 rotate in opposite directions, thereby driving the two clamping plate groups 6 to rotate in the opposite direction through the main gear 17 and the driven gear 8. The metal plate 7 is twisted due to the opposite rotation of the two sets of driven gears 8, which is used to simulate fatigue cracks.
[0030] In this embodiment, the thickness of the main gear 17 is different from that of the driven gear 8, so that the driven gear 8 can still effectively transmit torque when it is displaced by the stretching of the traction rope 9; specifically, the thickness of the main gear 17 is larger.
[0031] In this embodiment, both power output shafts of the dual-axis motor 15 are connected to the corresponding rotating shafts 16 via connecting pipes 14, with the connecting pipes 14 acting as couplings.
[0032] In this embodiment, the metal plate 7 needs to be placed inside the clamping plate assembly 6 beforehand. Rotating the bidirectional threaded rod 5 causes the two clamping plate assemblies 6 to clamp the metal plate 7. Starting the servo motor 11 causes the winding disc 10 to rotate. Because the winding disc 10 and the traction rope 9 are fixedly connected, the rotation of the winding disc 10 causes the traction rope 9 to wind around the outside of the winding disc 10. When the traction rope 9 winds around the outside of the winding disc 10, it pulls the two clamping plate assemblies 6 together. The gears 8 move simultaneously in opposite directions; the movement of the gears 8 causes the sliding rod 3 to slide on the outside of the fixed plate 2. During the movement of the sliding rod 3, the T-block 4 moves. During the movement of the T-block 4, the bidirectional threaded rod 5 moves. The movement of the bidirectional threaded rod 5 causes the clamping plate group 6 to move. The movement of the clamping plate group 6 pulls the metal plate 7 horizontally. The two clamping plate groups 6 are used to pull the metal plate 7 to induce fatigue cracks to simulate the failure of tensile fatigue fracture.
[0033] The main function of the connecting pipe 14 is to connect the L-shaped plate 1 and the dual-axis motor 15. When the dual-axis motor 15 is started, the two sets of output shafts of the dual-axis motor 15 rotate in opposite directions. The rotation of the two output shafts of the dual-axis motor 15 drives the two rotating shafts 16 to rotate through the connecting pipe 14. During the rotation of the rotating shafts 16, the main gear 17 will rotate. Because the main gear 17 and the driven gear 8 are meshed, the rotation of the main gear 17 will drive the driven gear 8 to rotate. The rotation of the driven gear 8 will drive the sliding rod 3 to rotate on the outside of the fixed plate 2. The rotation of the sliding rod 3 will drive the clamping plate assembly 6 to rotate. The rotation of the clamping plate assembly 6 will cause the metal plate 7 to twist. It is worth noting that at this time, the rotation directions of the two sets of driven gears 8 are opposite, so the metal plate 7 will be twisted, thereby causing fatigue cracks in the metal plate 7 to simulate the failure of bending fatigue fracture. At the same time, since the tensile fatigue fracture is applied through the traction rope 9, the rotation will not interfere with the tension of the traction rope, so the two failure modes will not interfere with each other.
Claims
1. A device for crack propagation of material fatigue, characterized by, include: The fatigue crack propagation unit comprises a first guide turntable (12), a winding disc (10), a servo motor (11), a traction rope (9), an L-shaped plate (1), and a metal plate (7). The servo motor (11) is fixed to the lower part of the support plate of the L-shaped plate (1). The power output of the servo motor (11) is fixed to the winding disc (10). The winding disc (10) is fixed to the center of the traction rope (9). The middle part of the traction rope (9) is wound on the winding disc (10). The two ends of the traction rope (9) are respectively fixed to the outer end of a follower gear (8) of the fatigue crack propagation unit. The fatigue crack propagation unit is symmetrically installed on the support plate of the L-shaped plate (1). The first guide turntable (12) is located between the part where the two ends of the traction rope (9) are fixed to the follower gear (8) and the part connected to the winding disc (10). The fatigue crack propagation unit includes: a dual-axis motor (15), a rotating shaft (16), a sliding rod (3), a T-block (4), a driven gear (8), a clamping plate assembly (6), a fixing plate (2), and a bidirectional threaded rod (5). The two fixing plates (2) are respectively fixedly connected to the two sides of the upper part of the support plate in the L-shaped plate (1). The sliding rod (3) passes through the opening in the center of the fixing plate (2) and is fitted with the opening with a clearance. The inner side of the sliding rod (3) is fixed to the fixing plate part of the T-block (4), and the opening part of the T-block (4) is fixed. On the inner side of the fixed plate, the smooth part in the center of the bidirectional threaded rod (5) passes through the opening of the T-shaped block (4), so that the bidirectional threaded rod (5) can rotate freely in the opening. The threaded parts at both ends of the bidirectional threaded rod (5) are respectively connected to one of the clamping plates in the two sets of clamping plate groups (6) by threads. The locking strip in the center of the clamping plate group (6) cooperates with the locking grooves at the upper and lower ends of the metal plate (7). When the bidirectional threaded rod (5) rotates, the opposite threaded parts at both ends will drive the two sets of clamping plate groups (6) to clamp the metal plate (7). Each sliding rod (3) has a driven gear (8) coaxially fixed on its outer end face. The driven gear (8) meshes with the main gear (17). The two main gears (17) are respectively connected to one power output shaft of the dual-axis motor (15) through the rotating shaft (16). The two power output shafts of the dual-axis motor (15) rotate in opposite directions.
2. The crack propagation device for material fatigue according to claim 1, characterized in that, The bottom part of the L-shaped board (1) is placed on the table.
3. The apparatus for crack propagation of material fatigue according to claim 1, wherein The power output shaft of the dual-axis motor (15) is connected to the corresponding rotating shaft (16) through the connecting pipe (14).
4. A crack propagation device for material fatigue according to claim 1, characterized in that, The thickness of the main gear (17) is different from that of the driven gear (8).
5. A crack propagation device for material fatigue according to claim 1, characterized in that, A second guide turntable (13) is also provided between the first guide turntable (12) and the winding turntable (10) of the traction rope (9).
6. A crack propagation device for material fatigue according to claim 5, characterized in that, The outer periphery of both the first guide turntable (12) and the second guide turntable (13) is in contact with the traction rope (9).