Fatigue experiment device and method for sling connecting pin shaft of suspension bridge

Abstract

The invention relates to the technical field of material performance testing devices, and discloses a fatigue experiment device and method for a sling connecting pin shaft of a suspension bridge. The device comprises a fatigue test device body, an experiment cavity is formed in the fatigue test device body, and a first mounting plate and a second mounting plate are oppositely arranged in the experiment cavity and used for fixing the two ends of a connecting pin body; the first fixing plate and the second fixing plate are oppositely arranged in the experiment cavity, and the first fixing plate is fixedly connected with the second mounting plate; the two ends of the elastic piece elastically abut against the first fixing plate and the second fixing plate respectively; the vibration motor is connected with the second fixing plate through a connecting rod, and the vibration motor is used for providing vibration and transmitting the vibration to the connecting pin body sequentially through the connecting rod, the second fixing plate, the elastic piece, the first fixing plate and the second mounting plate. The working efficiency is improved, meanwhile, the cost is low, and the practicability is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of material performance testing devices, and in particular relates to a fatigue testing device and method for a suspension bridge sling connecting pin. Background Art

[0002] The main components of the span system of a suspension bridge include the bridge, box girder, main cable and suspenders. The suspenders are connected to the main cable and box girder through pins and are the key load-bearing components in the span system of a suspension bridge. Each suspender has only one pin at the connection with the main cable / box girder through the pin. As one of the key force-transmitting components in the span system of a suspension bridge, whether the pin is in normal working condition is an important condition for the safe and reliable operation of the entire suspension bridge, and a device is needed to detect it.

[0003] The connecting pin fatigue test device is used to simulate the stress changes of the connecting pin under actual working conditions. By applying periodic loading, the fatigue life, fatigue limit and stability in a vibration environment are evaluated to ensure the safety and reliability of the connecting pin in long-term use. The device can conduct comprehensive testing and analysis on the fatigue performance, material properties and structural deformation of the connecting pin, providing an important basis for product design and improvement.

[0004] However, the current test equipment has large test scale, high cost, long test cycle, and cannot measure the results in time, which reduces work efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a suspension bridge sling connection pin fatigue test device and method in order to solve the above-mentioned problems that the current test device has a large test scale, high cost, long cycle, cannot measure the results in time, and reduces work efficiency.

[0006] The technical solution adopted by the present invention is as follows: A suspension bridge sling connecting pin fatigue test device, comprising a fatigue test device body, wherein a test cavity is provided inside the fatigue test device body, and further comprising: The first mounting plate and the second mounting plate are arranged opposite to each other in the experimental cavity and are used to fix the two ends of the connecting pin body; A fixing plate 1 and a fixing plate 2 are arranged opposite to each other in the experimental chamber, and the fixing plate 1 is fixedly connected to the mounting plate 2; An elastic member, two ends of which elastically abut against the first fixing plate and the second fixing plate respectively; The vibration motor is connected to the second fixing plate through a connecting rod. The vibration motor is used to provide vibration and transmit it to the connecting pin body through the connecting rod, the second fixing plate, the elastic member, the first fixing plate and the second mounting plate in sequence.

[0007] Furthermore, the suspension bridge sling connection pin fatigue test device also includes: Three clamping blocks, used for clamping the connecting pin body, each clamping block comprises an outer arc surface, the outer arc surface is provided with an external thread, and each clamping block is also provided with a clamping plate, the clamping plate is used for inserting the first mounting plate or the second mounting plate; The fixing nut is provided with an internal thread corresponding to the external thread and is used for fixing the three clamping blocks.

[0008] Furthermore, the first mounting plate and the second mounting plate are respectively provided with mounting rings, the interior of the mounting rings is provided with a plug-in cavity corresponding to the clamping plate, and the interior of the plug-in cavity is provided with a fixing column corresponding to the clamping plate.

[0009] Furthermore, the clamping block is provided with a limiting slider, the outer surface of the mounting ring is provided with a sliding groove corresponding to the limiting slider, the limiting slider is slidably connected to the inside of the sliding groove, a reset member is installed inside the sliding groove, and both ends of the reset member elastically resist the limiting slider and the inner wall of the sliding groove respectively.

[0010] Furthermore, anti-slip pads are pasted on the inner walls of the clamping block and the clamping plate.

[0011] Furthermore, the surface of mounting plate one is threadedly connected with a plurality of fixing bolts, the other ends of which are fixed inside the fatigue testing device body, and the surface of mounting plate two is threadedly connected with a plurality of fixing bolts, the other ends of which are fixed inside fixing plate one.

[0012] Furthermore, a plurality of support legs are installed on the lower surface of the fatigue test device body to support the fatigue test device body. Furthermore, an observation port connected to the experimental cavity is provided on one side surface of the fatigue test device body, and a transparent observation window is installed inside the observation port.

[0013] Furthermore, an operation port is provided on one side surface of the fatigue testing device body, and a sealing door is installed outside the operation port.

[0014] The present invention also provides a method for using a suspension bridge sling connection pin fatigue test device, comprising the steps of: Step 1: Insert the connecting pin body into the inside of the clamping block at one end, and then insert the connecting pin body into the inside of the clamping block at the other end, adjust the insertion distance of the connecting pin body, press the clamping block so that the fixing nut is sleeved on the outer surface of the clamping block, and screw the clamping blocks at both ends by rotating the fixing nut; Step 2: Start the vibration motor to drive the connecting rod to vibrate the elastic member, and then transmit the vibration force to the connecting pin body for fatigue testing, and wait for the connecting pin body to break to stop the vibration of the vibration motor; Step 3: Rotate the fastening nut to separate it from the clamping block, remove the connecting pin body from the clamping block, and remove the broken connecting pin body for observation; Step 3: Draw test conclusions by recording and analyzing the test data and observing the broken connecting pin body.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The fatigue test of the connecting pin body is carried out through the vibration of the vibration motor. The vibration frequency can simulate the working environment, and then the test results can be obtained quickly, which improves the work efficiency, reduces the cost and improves the practicality. 2. The sealing setting of the fatigue test device body can protect the operator during the test to prevent the operator from being injured by the broken parts flying out during the test, thus improving safety. 3. The connecting pin body is clamped by a clamping device, which improves the stability of the fixing of the connecting pin body, ensures the accuracy of the test results, and improves practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the fatigue testing device in the present invention; Figure 2 It is a schematic diagram of the internal structure of the fatigue testing device in the present invention; Figure 3 It is a side structural schematic diagram of the fatigue testing device in the present invention; Figure 4 It is a schematic diagram of the overall structure of the mounting plate device in the present invention; Figure 5 It is a schematic diagram of the overall structure of the clamping device in the present invention; Figure 6 It is a schematic diagram of the planar structure of the fatigue testing device in the present invention; Figure 7 For the present invention Figure 6 A is an enlarged view of the middle image.

[0017] Markings in the figure: 1. Fatigue test device body; 2. Support legs; 3. Transparent observation window; 4. Experimental cavity; 5. Central control panel; 6. Mounting plate 1; 7. Fastening nut 1; 8. Connecting pin body; 9. Fastening nut 2; 10. Mounting plate 2; 11. Fixing plate 1; 12. Spring; 13. Vibration motor; 14. Connecting rod; 15. Fixing plate 2; 16. Fixing bolt; 17. Mounting ring; 18. Slide groove; 19. Plug-in cavity; 20. Fixing column; 21. External thread; 22. Clamping block; 23. Clamping plate; 24. Limiting slider; 25. Internal thread; 26. Reset spring. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Reference Figure 1-7 A fatigue test device for a suspension bridge sling connecting pin shaft comprises a fatigue test device body 1, a central control panel 5 is installed on one side surface of the fatigue test device body 1, a test cavity 4 is opened inside the fatigue test device body 1, a mounting plate 6 is welded on one end of the test cavity 4, a mounting ring 17 is welded on one side surface of the mounting plate 6, a clamping block 22 is arranged inside the mounting ring 17, a connecting pin body 8 is plugged into the clamping block 22, another clamping block 22 is arranged on the outer surface of the other end of the connecting pin body 8, and the outer surface of the other end of the clamping block 22 is Another mounting ring 17 is arranged on the surface, a mounting plate 10 is welded to the other end of the mounting ring 17, a fixing plate 11 is threadedly connected to the surface of one side of the mounting plate 10, a spring 12 is arranged on one side of the fixing plate 11, a fixing plate 15 is arranged on the other end of the spring 12, a vibration motor 13 is arranged on one side of the upper end of the fixing plate 15, a connecting rod 14 corresponding to the vibration motor 13 is arranged on one side of the fixing plate 15, through the above design, the test results can be obtained quickly, the work efficiency is improved, and the cost is low, which improves the practicality.

[0020] Reference Figure 1-6 The outer surface of the connecting pin body 8 is provided with three clamping blocks 22, and one side surface of the clamping block 22 is provided with an external thread 21, the outer surface of the external thread 21 is threadedly connected with a fixing nut 7, and the outer surface of the external thread 21 on the other side is threadedly connected with a fixing nut 29, and the interior of the fixing nut 7 and the fixing nut 29 is provided with an internal thread 25 corresponding to the external thread 21. By threading the fixing nut 7 to the surface of the external thread 21, the clamping force of the clamping block 22 on the connecting pin body 8 can be improved, thereby improving the stability of the fixation, so that the connecting pin body 8 can be firmly fixed in the test device, thereby ensuring the normal operation of the test.

[0021] Reference Figure 5 A clamping plate 23 is welded on one side surface of the clamping block 22, a plug-in cavity 19 corresponding to the clamping plate 23 is opened inside the mounting ring 17, and a fixing column 20 corresponding to the clamping plate 23 is welded inside the plug-in cavity 19. The two sides of the clamping plate 23 are respectively in contact with the inner wall of the plug-in cavity 19 and the surface of the fixing column 20, thereby improving the stability of the clamping block 22 and ensuring the normal operation of the test.

[0022] Reference Figure 6-7 A limiting slider 24 is welded to one side surface of the clamping block 22, and a slide groove 18 corresponding to the limiting slider 24 is opened on the outer surface of the mounting ring 17. The limiting slider 24 is slidably connected to the inside of the slide groove 18, and a return spring 26 is installed inside the slide groove 18. The other end of the return spring 26 is arranged on the surface of the limiting slider 24. When the fastening nut 7 is removed, under the elastic force of the return spring 26, the limiting slider 24 will slide in the slide groove 18, thereby driving the clamping block 22 to disengage from the connecting pin body 8, which is convenient for the removal of the connecting pin body 8. At the same time, it can also clamp the connecting pin bodies 8 of different sizes, thereby improving practicality.

[0023] Reference Figure 2-4 and Figure 6 The surface of the mounting plate 16 is threadedly connected with a plurality of fixing bolts 16, and the other end of the fixing bolts 16 is fixed inside the fatigue testing device body 1. The surface of the mounting plate 10 is threadedly connected with a plurality of fixing bolts 16, and the other end of the fixing bolts 16 is fixed inside the fixing plate 11, so as to fix the mounting plate 16, facilitate the disassembly and assembly of the mounting ring 17, and improve convenience.

[0024] Reference Figure 1-3 A plurality of supporting legs 2 are installed on the lower surface of the fatigue test device body 1 to support the fatigue test device body 1, increase the height of the fatigue test device body 1 and the ground, increase air circulation, facilitate cleaning of the bottom, and improve cleanliness.

[0025] Reference Figure 1-2 An observation port connected to the experimental cavity 4 is provided on one side surface of the fatigue test device body 1, and a transparent observation window 3 is installed inside the observation port. The test process can be observed through the transparent observation window 3, which is convenient for conducting and recording. At the same time, it also protects the operator and improves safety.

[0026] Reference Figure 1-3 An operation port is provided on one side surface of the fatigue test device body 1, and a sealing door is installed on the outside of the operation port. The sealing door can be set to seal the test device inside the fatigue test device body 1, so as to protect the operator during the test and prevent the operator from being injured by the broken or flying parts during the test, thereby improving safety.

[0027] Reference Figure 5 The inner walls of the clamping block 22 and the clamping plate 23 are pasted with anti-slip pads to increase the friction between them and the surface of the connecting pin body 8, increase the stability of clamping the connecting pin body 8, ensure the normal progress of the test, and reduce the impact on the test results.

[0028] Reference Figure 1-7 , the steps are as follows: Step 1, open the sealing door, first insert the connecting pin body 8 into the inside of the clamping block 22 at one end, further, insert the connecting pin body 8 into the inside of the clamping block 22 at the other end, adjust the distance between them, further, press the clamping block 22 so that the fixing nut 1 7 and the fixing nut 2 9 can be sleeved on the outer surface of the clamping block 22, further, thread the clamping blocks 22 at both ends by rotating the fixing nut 1 7 and the fixing nut 2 9.

[0029] Step 2: Start the vibration motor 13 to drive the connecting rod 14 to vibrate the spring 12, and then transmit the vibration force to the connecting pin body 8 for fatigue testing, wait for the connecting pin body 8 to break and stop the vibration of the vibration motor 13, and remove the broken connecting pin body 8 for observation by reverse operation of the method in step 1.

[0030] Step three, record and analyze the time, force and other data during the test through the central control panel 5, and draw test conclusions based on the observation of the broken connecting pin body 8. Furthermore, take out the connecting pin body 8 again for testing, and draw more accurate conclusions through multiple groups of tests.

[0031] The implementation principle of the fatigue test device and method of the suspension bridge sling connection pin of the present invention is as follows: When fatigue test is needed, open the sealing door, first insert the connecting pin body 8 into the inside of the clamping block 22 at one end, further, insert the connecting pin body 8 into the inside of the clamping block 22 at the other end, adjust the distance between them, further, press the clamping block 22 so that the fixing nut 1 7 and the fixing nut 2 9 can be sleeved on the outer surface of the clamping block 22, further, thread the clamping blocks 22 at both ends by rotating the fixing nut 1 7 and the fixing nut 2 9, start the vibration motor 13, drive the connecting rod 14 to vibrate the spring 12, and then transmit the vibration force to the connecting pin body 8 for fatigue test, wait for the connecting pin body 8 to break and stop the vibration of the vibration motor 13, remove the broken connecting pin body 8 by reverse operation according to the method of step one for observation, record and analyze the time, force and other data during the test through the central control panel 5, and draw the test conclusion in combination with the observation of the broken connecting pin body 8, further, take out the connecting pin body 8 again for testing, and draw a more accurate conclusion through multiple groups of tests.

[0032] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fatigue test device for a suspension bridge sling connecting pin, comprising a fatigue test device body, wherein a test chamber is provided inside the fatigue test device body, and characterized in that: Also includes: The first mounting plate and the second mounting plate are arranged opposite to each other in the experimental cavity and are used to fix the two ends of the connecting pin body; A fixing plate 1 and a fixing plate 2 are arranged opposite to each other in the experimental chamber, and the fixing plate 1 is fixedly connected to the mounting plate 2; An elastic member, two ends of which elastically abut against the first fixing plate and the second fixing plate respectively; The vibration motor is connected to the second fixing plate through a connecting rod. The vibration motor is used to provide vibration and transmit it to the connecting pin body through the connecting rod, the second fixing plate, the elastic member, the first fixing plate and the second mounting plate in sequence.

2. A suspension bridge sling connection pin fatigue test device according to claim 1, characterized in that: The suspension bridge sling connection pin fatigue test device also includes: Three clamping blocks, used for clamping the connecting pin body, each clamping block comprises an outer arc surface, the outer arc surface is provided with an external thread, and each clamping block is also provided with a clamping plate, the clamping plate is used for inserting the first mounting plate or the second mounting plate; The fixing nut is provided with an internal thread corresponding to the external thread and is used for fixing the three clamping blocks.

3. A suspension bridge sling connection pin fatigue test device according to claim 2, characterized in that: The first mounting plate and the second mounting plate are respectively provided with mounting rings, the interior of the mounting rings is provided with a plug-in cavity corresponding to the clamping plate, and the interior of the plug-in cavity is provided with a fixing column corresponding to the clamping plate.

4. A suspension bridge sling connection pin fatigue test device according to claim 3, characterized in that: The clamping block is provided with a limiting slider, the outer surface of the mounting ring is provided with a sliding groove corresponding to the limiting slider, the limiting slider is slidably connected to the inside of the sliding groove, a reset member is installed inside the sliding groove, and both ends of the reset member elastically abut against the limiting slider and the inner wall of the sliding groove respectively.

5. A suspension bridge sling connection pin fatigue test device according to claim 2, characterized in that: The inner walls of the clamping block and the clamping plate are pasted with anti-slip pads.

6. A suspension bridge sling connection pin fatigue test device according to claim 1, characterized in that: The surface of the mounting plate 1 is threadedly connected with a plurality of fixing bolts, and the other ends of the fixing bolts are fixed inside the fatigue test device body; the surface of the mounting plate 2 is threadedly connected with a plurality of fixing bolts, and the other ends of the fixing bolts are fixed inside the fixing plate 1.

7. The suspension bridge sling connection pin fatigue test device according to claim 1, characterized in that: A plurality of supporting legs are installed on the lower surface of the fatigue test device body to support the fatigue test device body.

8. The suspension bridge sling connection pin fatigue test device according to claim 1, characterized in that: An observation port connected to the experimental cavity is provided on one side surface of the fatigue test device body, and a transparent observation window is installed inside the observation port.

9. The suspension bridge sling connection pin fatigue test device according to claim 1, characterized in that: An operation port is provided on one side surface of the fatigue testing device body, and a sealing door is installed outside the operation port.

10. A method for using the suspension bridge sling connection pin fatigue test device according to claim 1, characterized in that: Includes steps: Step 1: Insert the connecting pin body into the inside of the clamping block at one end, and then insert the connecting pin body into the inside of the clamping block at the other end, adjust the insertion distance of the connecting pin body, press the clamping block so that the fixing nut is sleeved on the outer surface of the clamping block, and screw the clamping blocks at both ends by rotating the fixing nut; Step 2: Start the vibration motor to drive the connecting rod to vibrate the elastic member, and then transmit the vibration force to the connecting pin body for fatigue testing, and wait for the connecting pin body to break to stop the vibration of the vibration motor; Step 3: Rotate the fastening nut to separate it from the clamping block, remove the connecting pin body from the clamping block, and remove the broken connecting pin body for observation; Step 3: Draw test conclusions by recording and analyzing the test data and observing the broken connecting pin body.

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