Steel plate crack simulation test device
By designing a test device for simulating cracks on the surface of steel plates, the problems of long experimental cycles and high cost in the prior art are solved, and fast and accurate crack detection sensor performance verification is achieved, and R&D efficiency is improved.
Patent Information
- Application Number
- CN202420668562.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-02
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-04-02
AI Technical Summary
When verifying the performance of crack detection sensors, the prior art relies on standard fatigue specimens or fatigue components, resulting in long experimental cycles and high costs, which is not conducive to the research and development of crack detection products.
Design a steel plate crack simulation test device, including a concave test bench, fixed block, movable block, fixed plate, movable plate, drive motor, screw, limit slider and laser extensometer, drive the movable block to move through the drive motor and screw , drive the movable plate to move along the slide chute, simulate the formation and expansion process of cracks on the surface of the steel plate, and the laser extensometer determines the moving distance of the movable plate to verify the sensor performance.
This device can quickly simulate the occurrence and expansion of cracks on the surface of steel plates, verify the performance of crack detection sensors, and the test results are accurate and reliable, greatly reduce the experimental cycle, save experimental costs, and improve the research and development efficiency of crack detection products.
Smart Images
Figure CN222529342U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of detection, in particular to a steel plate crack simulation test device. Background Art
[0002] In the field of steel structure engineering, fatigue cracks in crane beams are a common problem because steel is prone to fatigue cracks under long-term use and repeated loads. Fatigue fracture of steel is a brittle fracture with little plastic deformation around the crack.
[0003] Fatigue cracks in steel structures may cause structural damage and danger, so structural health detection, especially crack detection, is particularly important. There are many technical principles that can be applied to fatigue crack detection on the surface of steel structures. In the process of developing crack detection sensors using these principles, it is necessary to test the performance of the sensors through experiments. The traditional experimental method is to use standard fatigue specimens or fatigue components to verify the performance of the sensor, but its experimental cycle is long and the cost is high, which is not conducive to the development of crack detection products. Summary of the invention
[0004] The technical problem to be solved by the utility model is to provide a steel plate crack simulation test device, which can quickly simulate the process of the appearance and expansion of cracks on the steel plate surface, so as to verify the performance of the crack detection sensor, and the test results are accurate and reliable, which greatly reduces the experimental cycle, saves experimental costs, and improves the research and development efficiency of crack detection products.
[0005] In order to solve the above technical problems, the utility model of a steel plate crack simulation test device includes a concave test bench, a fixed block, a movable block, a fixed plate, a movable plate, a driving motor, a screw, a limit slide and a laser extensometer. The bottom surface of the inner cavity of the concave test bench is provided with slide grooves at intervals along the length direction. The screw is located in the slide groove. The fixed block is arranged on one side of the inner cavity of the concave test bench. The driving motor is arranged in the fixed block and the driving shaft is connected to one end of the screw. The other end of the screw is arranged on the other side of the inner cavity of the concave test bench through a bearing. The movable block is located in the inner cavity of the concave test bench. And it moves along the slide groove by being driven by a screw rod, the top surfaces of the fixed block and the movable block are separated by positioning holes, the bottom surfaces of the fixed plate and the movable plate are vertically spaced apart with positioning columns, the bottom ends of the positioning columns on the bottom surface of the fixed plate are inserted into the positioning holes on the top surface of the fixed block, and the bottom ends of the positioning columns on the bottom surface of the movable plate are inserted into the positioning holes on the top surface of the movable block, the top surfaces of the fixed plate and the movable plate are in the same plane, the limiting slide bars are arranged on the sides of the fixed plate and the movable plate to lock the moving distance of the movable plate relative to the fixed plate, and the laser extensometer is arranged on the other side of the inner cavity of the concave test bench to measure the moving distance of the movable plate.
[0006] Furthermore, the limiting slide bar includes a limiting long plate and a limiting sliding block, the limiting long plate is arranged on the side of the fixed plate, the side of the movable plate is provided with a limiting short sliding groove, the limiting sliding block is arranged in the limiting short sliding groove and slides along the limiting short sliding groove, the limiting sliding block is provided with a socket, the limiting long plate extends into the socket of the limiting sliding block and is locked with a fastening bolt.
[0007] Furthermore, the sides of the fixed block and the movable block are respectively provided with fixing screw holes penetrating the positioning hole, and fixing bolts are screwed into the fixing screw holes to lock the positioning column.
[0008] Since the steel plate crack simulation test device of the utility model adopts the above-mentioned technical scheme, that is, the bottom surface of the inner cavity of the concave test bench of the device is provided with slide grooves at intervals along the length direction, the screw is located in the slide groove, the fixed block is arranged on one side of the inner cavity of the concave test bench, the driving motor is arranged in the fixed block and the driving shaft is connected to one end of the screw, the other end of the screw is arranged on the other side of the inner cavity of the concave test bench through a bearing, the movable block is located in the inner cavity of the concave test bench and is driven to move along the slide groove by the screw, the top surfaces of the fixed block and the movable block are separated by positioning holes, the bottom surfaces of the fixed plate and the movable plate are vertically provided with positioning columns, the bottom ends of the positioning columns on the bottom surface of the fixed plate are inserted into the positioning holes on the top surface of the fixed block, the bottom ends of the positioning columns on the bottom surface of the movable plate are inserted into the positioning holes on the top surface of the movable block, the top surfaces of the fixed plate and the movable plate are in the same plane, the limiting slide bars are arranged on the sides of the fixed plate and the movable plate to lock the moving distance of the movable plate relative to the fixed plate, and the laser extensometer is arranged on the other side of the inner cavity of the concave test bench to measure the moving distance of the movable plate. This device can quickly simulate the process of crack appearance and expansion on the steel plate surface, thereby verifying the performance of the crack detection sensor. The test results are accurate and reliable, which greatly reduces the experimental cycle, saves experimental costs, and improves the research and development efficiency of crack detection products. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples:
[0010] Figure 1 This is a structural schematic diagram of the steel plate crack simulation test device of the utility model;
[0011] Figure 2 for Figure 1 Front view of;
[0012] Figure 3 for Figure 1 A top view of
[0013] Figure 4 This is a schematic diagram of the connection between the limit slide bar, the fixed plate and the movable plate in the device;
[0014] Figure 5 This is a schematic diagram of the appearance of the fixed block and the movable block in the device;
[0015] Figure 6 This is a schematic diagram of the connection between the fixed plate, the movable plate and the positioning column in this device. DETAILED DESCRIPTION
[0016] Implementation example Figures 1 to 6 As shown, the utility model steel plate crack simulation test device includes a concave test bench 1, a fixed block 2, a movable block 3, a fixed plate 4, a movable plate 5, a driving motor 6, a screw 7, a limit slide 8 and a laser extensometer 9. The bottom surface of the inner cavity of the concave test bench 1 is provided with slide grooves 11 at intervals along the length direction. The screw 7 is located in the slide groove 11. The fixed block 2 is arranged on one side of the inner cavity of the concave test bench 1. The driving motor 6 is arranged in the fixed block 2 and the driving shaft is connected to one end of the screw 7. The other end of the screw 7 is arranged on the other side of the inner cavity of the concave test bench 1 through a bearing 71. The movable block 3 is located in the inner cavity of the concave test bench 1 and is driven by the screw 7 to move along the inner cavity of the concave test bench 1. The slide groove 11 moves, and the top surfaces of the fixed block 2 and the movable block 3 are spaced apart with positioning holes 21 and 31. The bottom surfaces of the fixed plate 4 and the movable plate 5 are vertically spaced apart with positioning columns 41 and 51. The bottom end of the positioning column 41 on the bottom surface of the fixed plate 4 is inserted into the positioning hole 21 on the top surface of the fixed block 2, and the bottom end of the positioning column 51 on the bottom surface of the movable plate 5 is inserted into the positioning hole 31 on the top surface of the movable block 3. The top surfaces of the fixed plate 4 and the movable plate 5 are in the same plane. The limiting slide bar 8 is provided on the sides of the fixed plate 4 and the movable plate 5 to lock the moving distance of the movable plate 5 relative to the fixed plate 4. The laser extensometer 9 is provided on the other side of the inner cavity of the concave test bench 1 to measure the moving distance of the movable plate 5.
[0017] Preferably, the limiting slide bar 8 includes a limiting long plate 81 and a limiting slider 82, the limiting long plate 81 is arranged on the side of the fixed plate 4, the side of the movable plate 5 is provided with a limiting short slide groove 52, the limiting slider 82 is arranged in the limiting short slide groove 52 and slides along the limiting short slide groove 52, the limiting slider 82 is provided with a socket, the limiting long plate 81 extends into the socket of the limiting slider 82 and is locked with a fastening bolt 83.
[0018] Preferably, the sides of the fixed block 2 and the movable block 3 are respectively provided with fixing screw holes 22 and 32 penetrating the positioning holes, and fixing bolts 23 and 33 are screwed into the fixing screw holes 22 and 32 to lock the positioning columns 41 and 51, thereby ensuring a firm connection between the positioning columns and the fixed block and the movable block.
[0019] In the steel plate crack simulation test, the movable block is moved to the side of the fixed block and aligned with it by driving the motor and the screw. At the same time, the movable block drives the movable plate to abut against the side of the fixed plate, and the relative position of the movable plate and the fixed plate is locked by the limit slide bar; the steel plate is installed (welded) on the surface of the movable plate and the fixed plate, and the screw is driven by the motor to rotate, so that the movable block moves horizontally along the slide groove on the bottom surface of the concave test bench inner cavity, and the movable block drives the movable plate to move horizontally. The steel plate cracks due to the tension of the movable plate, thereby simulating the formation and expansion process of fatigue cracks on the steel plate surface. The laser extensometer detects the horizontal movement distance of the movable plate, and obtains the displacement data of the movable plate at different time points. The performance of the crack detection sensor can be tested based on the displacement data.
[0020] Among them, the limit slide is used to lock the relative position of the movable plate and the fixed plate to ensure that the fixed plate and the movable plate have no relative displacement at the initial position of the test. At the initial position of the test, the limit slider is located at the front end of the short limit slide groove on the side of the movable plate. As the movable plate moves forward, the limit slider gradually slides to the rear end of the short limit slide groove on the side of the movable plate, forming a moving distance of the movable plate relative to the fixed plate, so that the steel plates installed (welded) on the surface of the movable plate and the fixed plate will produce cracks under the action of the tensile force of the movable plate, thereby achieving the purpose of the test.
[0021] The device has a simple structure and is easy to operate. It overcomes the defect of using standard fatigue specimens or fatigue components to verify sensor performance. It can quickly simulate the process of crack appearance and expansion on the steel plate surface. The horizontal movement distance of the movable plate is detected by a laser extensometer to ensure the accuracy and reliability of the test results, greatly reduce the experimental cycle, save experimental costs, and improve the research and development efficiency of crack detection products.
Claims
1. A steel plate crack simulation test device, characterized in that: The device includes a concave test bench, a fixed block, a movable block, a fixed plate, a movable plate, a driving motor, a screw, a limit slide and a laser extensometer. The bottom surface of the inner cavity of the concave test bench is provided with slide grooves at intervals along the length direction. The screw is located in the slide groove. The fixed block is arranged on one side of the inner cavity of the concave test bench. The driving motor is arranged in the fixed block and the driving shaft is connected to one end of the screw. The other end of the screw is arranged on the other side of the inner cavity of the concave test bench through a bearing. The movable block is located in the inner cavity of the concave test bench and is driven by the screw to move along the slide groove. Movement, the top surfaces of the fixed block and the movable block are separated by positioning holes, the bottom surfaces of the fixed plate and the movable plate are vertically spaced apart with positioning columns, the bottom ends of the positioning columns on the bottom surface of the fixed plate are inserted into the positioning holes on the top surface of the fixed block, and the bottom ends of the positioning columns on the bottom surface of the movable plate are inserted into the positioning holes on the top surface of the movable block, the top surfaces of the fixed plate and the movable plate are in the same plane, the limiting slide bars are arranged on the sides of the fixed plate and the movable plate to lock the moving distance of the movable plate relative to the fixed plate, and the laser extensometer is arranged on the other side of the inner cavity of the concave test bench to measure the moving distance of the movable plate.
2. The steel plate crack simulation test device according to claim 1, characterized in that: The limiting slide bar includes a limiting long plate and a limiting sliding block. The limiting long plate is arranged on the side of the fixed plate, and the side of the movable plate is provided with a limiting short sliding groove. The limiting sliding block is arranged in the limiting short sliding groove and slides along the limiting short sliding groove. The limiting sliding block is provided with a socket, and the limiting long plate extends into the socket of the limiting sliding block and is locked with a fastening bolt.
3. The steel plate crack simulation test device according to claim 1 or 2, characterized in that: The sides of the fixed block and the movable block are respectively provided with fixing screw holes penetrating the positioning hole, and fixing bolts are screwed into the fixing screw holes to lock the positioning column.