Multi-boundary-condition full-size steel pipe three-point and four-point bending static force and fatigue experiment device

Abstract

The invention provides a multi-boundary-condition full-size steel pipe three-point and four-point bending static force and fatigue experiment device. The device comprises an operation table, two telescopic plates, two placement devices, two mounting assemblies, two fixing devices, two connecting assemblies, two rotating devices, a detection device and a display. The two telescopic plates are arranged at the two ends of the operation table correspondingly. The two placing devices are arranged on the surfaces of the two telescopic plates correspondingly. According to the multi-boundary-condition full-size steel pipe three-point and four-point bending static force and fatigue experiment device provided by the invention, the first lifting rod, the placement seat, the base, the second lifting rod and the fixed seat are arranged on the telescopic plates on the two sides of the operation table, so that a pipeline can be placed, and free-end and full-constraint experiment operation can be carried out; the mounting assembly and the fixing device are arranged on the surface of the fixing seat and are matched with the connecting assembly and the rotating device for use, so that multi-angle experimental operation on the pipeline is facilitated.

Description

Technical Field

[0001] This invention relates to the field of oil pipe testing, and more particularly to a device for static and fatigue testing of full-size steel pipes under multiple boundary conditions at three and four points of bending. Background Technology

[0002] As oil and gas resource exploration and development continue to advance into deeper strata and complex geological areas, the number of oil and gas wells with special working conditions, such as deep wells, ultra-deep wells, high-pressure gas wells, high-temperature and high-pressure wells, and horizontal wells, is increasing. Under these harsh mining environments, oil pipes face more severe challenges, placing extremely high demands on their performance and quality. To meet the needs of complex working conditions, developing new types of pipes has become the key to the industry's development, and a thorough understanding of the performance of pipes under various stress conditions is an important foundation for the research and development of new pipes.

[0003] Among the many properties of oil pipes, bending resistance is particularly critical. When operating underground, pipes are subjected to various complex external forces, causing them to bend and deform. If the bending resistance of the pipe is insufficient, structural damage and sealing failure may occur, leading to serious accidents such as oil and gas leaks. This can not only cause huge economic losses but also threaten the environment and personnel safety. Therefore, it is essential to accurately test and evaluate the structural integrity and sealing integrity of oil pipes under bending stress, which requires the use of advanced bending mechanics testing machines.

[0004] Existing equipment has shortcomings in simulating actual working conditions. In actual downhole operations, the boundary conditions of oil pipes are complex and diverse. The constraint states at both ends are not fixed and may be free ends, fully constrained ends, or only changing angles. However, existing testing equipment often cannot flexibly adjust the constraint conditions at both ends and cannot fully simulate these complex working conditions, resulting in deviations between test results and actual application scenarios. In addition, existing equipment cannot adequately meet the requirements in terms of fatigue testing. During long-term use, oil pipes will be repeatedly subjected to bending stress, and existing equipment cannot effectively simulate this fatigue loading process, making it difficult to accurately assess the fatigue life and reliability of the pipes.

[0005] Therefore, it is necessary to provide a multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing device to solve the above-mentioned technical problems. Summary of the Invention

[0006] This invention provides a multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing device, which solves the problem that existing testing equipment often has difficulty in flexibly adjusting the constraint conditions at both ends, and cannot fully simulate these complex working conditions, resulting in deviations between the test results and actual application scenarios. In addition, existing devices cannot well meet the requirements in terms of fatigue testing.

[0007] To solve the above-mentioned technical problems, the present invention provides a multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing apparatus, comprising:

[0008] The system includes an operating table, two telescopic plates, two placement devices, two mounting components, two fixing devices, two connecting components, two rotating devices, a detection device, and a display.

[0009] The two telescopic plates are respectively disposed at both ends of the operating table;

[0010] The two placement devices are respectively disposed on the surfaces of the two telescopic plates. Each placement device includes a first lifting rod, a placement seat, a base, a second lifting rod, and a fixed seat. The first lifting rod is connected to the surface of the telescopic plate, the placement seat is connected to the top of the first lifting rod, the base is connected to the side of the placement seat, the second lifting rod is installed on the surface of the base, and the fixed seat is connected to the top of the second lifting rod through a connecting block.

[0011] The two mounting components are respectively disposed on the top of the two fixing bases;

[0012] The two fixing devices are respectively disposed on one side of the two mounting components;

[0013] The two connecting components are respectively disposed on one side of the two placement seats;

[0014] The two rotating devices are respectively disposed on one side of the two connecting components;

[0015] The detection device is located at the center of the operating table surface, and the display is mounted on one side of the operating table surface.

[0016] Preferably, the mounting assembly includes a fixed rod, a movable sleeve, a circular rod, a hydraulic adjusting rod, a fixing bolt, and a stop. The fixed rod is connected to the top of the fixed base, the movable sleeve is fitted onto the surface of the fixed rod, the circular rod is connected to one side of the movable sleeve, the hydraulic adjusting rod is connected to one end of the circular rod, the fixing bolt is disposed between the movable sleeve and the fixed rod, and the stop is connected to the top of the fixed rod.

[0017] Preferably, the fixing device includes an L-shaped fixing rod, a telescopic rod, a fixing ring, a first double-headed hydraulic telescopic rod, two extension rods, and two arc-shaped fixing blocks. The L-shaped fixing rod is connected to one end of the hydraulic adjusting rod, the telescopic rod is connected to the bottom end of the L-shaped fixing rod, the first double-headed hydraulic telescopic rod is connected to the bottom end of the telescopic rod through the fixing ring, the two extension rods are respectively connected to both ends of the first double-headed hydraulic telescopic rod, and the two arc-shaped fixing blocks are respectively connected to one end of the two extension rods.

[0018] Preferably, the connecting assembly includes a threaded rod, an extension frame, a hydraulic connecting frame, and two threaded sleeves. The threaded rod is disposed inside the placement seat, the extension frame is connected to one end of the threaded rod, the hydraulic connecting frame is connected to one end of the extension frame, and both threaded sleeves are fitted onto the surface of the threaded rod.

[0019] Preferably, the rotating device includes a circular block, a connecting ring, a second double-headed hydraulic telescopic rod, two movable frames, two arc-shaped extrusion blocks, a connecting bracket, and a motor. The second double-headed hydraulic telescopic rod is connected to the center of the surface of the circular block through the connecting ring. The two movable frames are respectively connected to the two ends of the second double-headed hydraulic telescopic rod, and the two arc-shaped extrusion blocks are respectively connected to one end of the two movable frames.

[0020] Preferably, the connecting bracket is connected to one side of the circular block, and the motor is connected to one side of the connecting bracket and connected to the hydraulic connecting frame.

[0021] Preferably, the detection device includes a slide rail, two telescopic frames, two detection heads, and two bolts. The slide rail is connected to the center of the operating table surface, the two telescopic frames are respectively disposed on both sides of the slide rail surface, the two detection heads are respectively connected to the top of the two telescopic frames, and the two bolts are respectively disposed between the two telescopic frames and the slide rail.

[0022] Preferably, a moving device is provided between the operating platform and the two telescopic plates. The moving device includes a third double-headed hydraulic telescopic rod, two fixed brackets and a limiting ring. The third double-headed hydraulic telescopic rod is connected to the bottom of the operating platform through the limiting ring, and the two fixed brackets are respectively connected to the two ends of the third double-headed hydraulic telescopic rod.

[0023] Preferably, a pulling assembly is provided between the operating table and the slide rail. The pulling assembly includes a circular fixed rod, a pulling sleeve, a splicing bracket, a limiting bolt, and a circular stop. The circular fixed rod is connected to the surface of the operating table, the pulling sleeve is fitted onto the surface of the circular fixed rod, the splicing bracket is connected between the pulling sleeve and the slide rail, the limiting bolt is disposed between the pulling sleeve and the circular fixed rod, and the circular stop is connected to the top end of the circular fixed rod.

[0024] Preferably, a disassembly assembly is provided between the fixed base and the fixed rod. The disassembly assembly includes an mounting block, a threaded block, and a threaded connecting sleeve. The threaded block is connected to the surface of the fixed base, the mounting block is sleeved on the surface of the threaded block, and the threaded connecting sleeve is threadedly connected to the surface of the threaded block.

[0025] Compared with related technologies, the multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing device provided by the present invention has the following advantages:

[0026] This invention provides a multi-boundary condition full-size steel pipe three- and four-point bending static and fatigue testing device. The device is equipped with a first lifting rod, a placement seat, a base, a second lifting rod, and a fixed seat on the telescopic plates on both sides of the operating table. This allows for the placement of the pipe and the performance of free-end and fully constrained test operations. The surface of the fixed seat is equipped with mounting components and fixing devices, which, together with the connecting components and rotating devices, facilitate the performance of multi-angle test operations on the pipe. Attached Figure Description

[0027] Figure 1 A schematic diagram of the first embodiment of the multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue test device provided by the present invention;

[0028] Figure 2 for Figure 1 The enlarged schematic diagram of part A shown below;

[0029] Figure 3 for Figure 1 A three-dimensional structural diagram of the fatigue testing apparatus shown from a first-view perspective;

[0030] Figure 4 for Figure 3 The enlarged schematic diagram of section B is shown below;

[0031] Figure 5 for Figure 3 The enlarged schematic diagram of section C is shown below;

[0032] Figure 6 for Figure 3 The enlarged schematic diagram of part D is shown below;

[0033] Figure 7 for Figure 3 The enlarged schematic diagram of part E is shown below;

[0034] Figure 8 for Figure 1 A three-dimensional structural diagram of the fatigue testing device shown from a second perspective;

[0035] Figure 9 for Figure 8 The enlarged schematic diagram of part F shown;

[0036] Figure 10 for Figure 8 The enlarged schematic diagram of part G shown;

[0037] Figure 11 A schematic diagram of the second embodiment of the multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue test device provided by the present invention;

[0038] Figure 12 for Figure 11 The enlarged schematic diagram of section H is shown below;

[0039] Figure 13 This is a structural schematic diagram of the third embodiment of the multi-boundary condition full-size steel pipe three- and four-point bending static and fatigue test device provided by the present invention.

[0040] The diagram labels are: 1. Control panel; 2. Telescopic plate;

[0041] 3. Placement device; 31. First lifting rod; 32. Placement seat; 33. Base; 34. Second lifting rod; 35. Fixing seat;

[0042] 4. Installation components; 41. Fixing rod; 42. Movable sleeve; 43. Round rod; 44. Hydraulic adjusting rod; 45. Fixing bolt; 46. Stop block;

[0043] 5. Fixing device; 51. L-shaped fixing rod; 52. Telescopic rod; 53. Fixing ring; 54. First double-headed hydraulic telescopic rod; 55. Extension rod; 56. Arc-shaped fixing block;

[0044] 6. Connecting assembly; 61. Threaded rod; 62. Extension frame; 63. Hydraulic connecting frame; 64. Threaded sleeve;

[0045] 7. Rotating device; 71. Circular block; 72. Connecting ring; 73. Second double-headed hydraulic telescopic rod; 74. Movable frame; 75. Arc-shaped extrusion block; 76. Connecting bracket; 77. Motor;

[0046] 8. Detection device; 81. Slide rail; 82. Movable telescopic frame; 83. Detection head; 84. Bolts;

[0047] 9. Monitor;

[0048] 10. Moving device; 101. Third double-headed hydraulic telescopic rod; 102. Fixed bracket; 103. Limiting ring;

[0049] 11. Pulling assembly; 111. Circular fixing rod; 112. Pulling sleeve; 113. Splicing bracket; 114. Limit bolt; 115. Circular stop block;

[0050] 12. Disassembly component; 121. Mounting block; 122. Threaded block; 123. Threaded connection sleeve. Detailed Implementation

[0051] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0052] First Embodiment

[0053] Please refer to the following: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 ,in, Figure 1 A schematic diagram of the first embodiment of the multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue test device provided by the present invention; Figure 2 for Figure 1 The enlarged schematic diagram of part A shown below; Figure 3 for Figure 1 A three-dimensional structural diagram of the fatigue testing apparatus shown from a first-view perspective; Figure 4 for Figure 3 The enlarged schematic diagram of section B is shown below; Figure 5 for Figure 3 The enlarged schematic diagram of section C is shown below; Figure 6 for Figure 3 The enlarged schematic diagram of part D is shown below; Figure 7 for Figure 3 The enlarged schematic diagram of part E is shown below; Figure 8 for Figure 1 A three-dimensional structural diagram of the fatigue testing device shown from a second perspective; Figure 9 for Figure 8 The enlarged schematic diagram of part F shown; Figure 10 for Figure 8 The enlarged schematic diagram of section G is shown. The multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing apparatus includes:

[0054] 1. Operating panel; 2. Two telescopic plates; 3. Two placement devices; 4. Two mounting components; 5. Two fixing devices; 6. Two connecting components; 7. Two rotating devices; 8. Detection device; and 9. Display.

[0055] The two telescopic plates 2 are respectively disposed at both ends of the operating table 1;

[0056] Two placement devices 3 are respectively disposed on the surfaces of the two telescopic plates 2. Each placement device 3 includes a first lifting rod 31, a placement seat 32, a base 33, a second lifting rod 34, and a fixed seat 35. The first lifting rod 31 is connected to the surface of the telescopic plate 2, the placement seat 32 is connected to the top of the first lifting rod 31, the base 33 is connected to the side of the placement seat 32, the second lifting rod 34 is installed on the surface of the base 33, and the fixed seat 35 is connected to the top of the second lifting rod 34 through a connecting block.

[0057] The two mounting components 4 are respectively disposed on the top of the two fixing bases 35;

[0058] The two fixing devices 5 are respectively disposed on one side of the two mounting components 4;

[0059] The two connecting components 6 are respectively disposed on one side of the two placement seats 32;

[0060] The two rotating devices 7 are respectively disposed on one side of the two connecting components 6;

[0061] The detection device 8 is located at the center of the surface of the operating table 1, and the display 9 is mounted on one side of the surface of the operating table 1.

[0062] The mounting assembly 4 includes a fixed rod 41, a movable sleeve 42, a circular rod 43, a hydraulic adjusting rod 44, a fixing bolt 45, and a stop block 46. The fixed rod 41 is connected to the top of the fixed base 35. The movable sleeve 42 is fitted onto the surface of the fixed rod 41. The circular rod 43 is connected to one side of the movable sleeve 42. The hydraulic adjusting rod 44 is connected to one end of the circular rod 43. The fixing bolt 45 is disposed between the movable sleeve 42 and the fixed rod 41. The stop block 46 is connected to the top of the fixed rod 41.

[0063] The use of the fixed rod 41 and the movable sleeve 42 allows for adjustment of the vertical position of the fixing device 5.

[0064] The fixing device 5 includes an L-shaped fixing rod 51, a telescopic rod 52, a fixing ring 53, a first double-headed hydraulic telescopic rod 54, two extension rods 55, and two arc-shaped fixing blocks 56. The L-shaped fixing rod 51 is connected to one end of the hydraulic adjusting rod 44, the telescopic rod 52 is connected to the bottom end of the L-shaped fixing rod 51, the first double-headed hydraulic telescopic rod 54 is connected to the bottom end of the telescopic rod 52 through the fixing ring 53, the two extension rods 55 are respectively connected to the two ends of the first double-headed hydraulic telescopic rod 54, and the two arc-shaped fixing blocks 56 are respectively connected to one end of the two extension rods 55.

[0065] The connecting assembly 6 includes a threaded rod 61, an extension frame 62, a hydraulic connecting frame 63, and two threaded sleeves 64. The threaded rod 61 is disposed inside the placement seat 32. The extension frame 62 is connected to one end of the threaded rod 61. The hydraulic connecting frame 63 is connected to one end of the extension frame 62. Both threaded sleeves 64 are fitted onto the surface of the threaded rod 61.

[0066] The rotating device 7 includes a circular block 71, a connecting ring 72, a second double-headed hydraulic telescopic rod 73, two movable frames 74, two arc-shaped extrusion blocks 75, a connecting bracket 76, and a motor 77. The second double-headed hydraulic telescopic rod 73 is connected to the center of the surface of the circular block 71 through the connecting ring 72. The two movable frames 73 are respectively connected to the two ends of the second double-headed hydraulic telescopic rod 73, and the two arc-shaped extrusion blocks 75 are respectively connected to one end of the two movable frames 74.

[0067] The connecting bracket 76 is connected to one side of the circular block 71, and the motor 77 is connected to one side of the connecting bracket 76 and is connected to the hydraulic connecting frame 63.

[0068] The detection device 8 includes a slide rail 81, two movable telescopic frames 82, two detection heads 83, and two bolts 84. The slide rail 81 is connected to the center of the surface of the operating table 1. The two movable telescopic frames 82 are respectively disposed on both sides of the surface of the slide rail 81. The two detection heads 83 are respectively connected to the top of the two movable telescopic frames 82. The two bolts 84 are respectively disposed between the two movable telescopic frames 82 and the slide rail 81.

[0069] A moving device 10 is provided between the operating platform 1 and the two telescopic plates 2. The moving device 10 includes a third double-headed hydraulic telescopic rod 101, two fixed brackets 102 and a limiting ring 103. The third double-headed hydraulic telescopic rod 101 is connected to the bottom of the operating platform 1 through the limiting ring 103, and the two fixed brackets 102 are respectively connected to the two ends of the third double-headed hydraulic telescopic rod 101.

[0070] Telescopic plate 2 and placement device 3: The telescopic plate 2 is located at both ends of the operating table 1 and can be flexibly extended and retracted. It can be adjusted according to the length of the steel pipe to adapt to the testing needs of steel pipes of different sizes. The placement device 3 is installed on the surface of the telescopic plate 2. The first lifting rod 31 can adjust the height of the placement seat 32 to facilitate the precise placement of the steel pipe in the appropriate position. The base 33 provides support for the second lifting rod 34. The second lifting rod 34 can further fine-tune the height of the fixed seat 35 to make the steel pipe more stable when placed, and at the same time provide a basis for subsequent experimental operations under different constraint conditions.

[0071] Mounting component 4 and fixing device 5: Mounting component 4 is installed on top of fixing base 35. Fixing rod 41 provides stable support. Movable sleeve 42 can slide on fixing rod 41 and is fixed in different positions by fixing bolt 45, thereby adjusting the height of circular rod 43 and hydraulic adjusting rod 44 to meet the fixing requirements of steel pipes of different diameters. Fixing device 5 is used in conjunction with mounting component 4. L-shaped fixing rod 51 is connected to hydraulic adjusting rod 44. Telescopic rod 52 can adjust the height of fixing ring 53. First double-headed hydraulic telescopic rod 54 drives extension rod 55 and arc-shaped fixing block 56 to move. When arc-shaped fixing block 56 hugs the steel pipe, it can fix the steel pipe and play a key role in the full constraint experiment.

[0072] Connecting component 6 and rotating device 7: Connecting component 6 is located on one side of the placement seat 32. The threaded rod 61 can rotate within the placement seat 32, driving the extension frame 62 and the hydraulic connecting frame 63 to move. By adjusting the position of the threaded sleeve 64, the overall position of the connecting component 6 can be finely adjusted. The rotating device 7 is connected to the connecting component 6. The second double-headed hydraulic telescopic rod 73 pushes the movable frame 74 and the arc-shaped extrusion block 75 to move, thereby clamping the steel pipe. The motor 77 is connected to the hydraulic connecting frame 63 through the connecting bracket 76. When the motor 77 rotates, it can drive the circular block 71 and the rotating device 7 connected to it to rotate as a whole, thereby changing the angle of the steel pipe to meet the experimental requirement of changing only the angle.

[0073] The detection device 8 and the display 9 are as follows: The detection device 8 is installed at the center of the surface of the operating table 1. The slide rail 81 provides a sliding track for the movable telescopic frame 82. The position of the movable telescopic frame 82 on the slide rail 81 can be fixed by adjusting the bolt 84. The detection head 83 is installed at the top of the movable telescopic frame 82 and is used to detect various data of the steel pipe during the experiment, such as bending deformation and stress distribution. The display 9 is installed on one side of the surface of the operating table 1 and is used to display the data collected by the detection device 8 in real time, so as to facilitate the observation and recording by the experimenters.

[0074] Working principle

[0075] Free end test operation: Place the steel pipe on the placement seat 32. Relying only on the support of the placement seat 32 and the first lifting rod 31 and the second lifting rod 34, without using the fixing device 5 to fix the two ends of the steel pipe, the two ends of the steel pipe are in a free state. Three-point bending static and fatigue tests under free end boundary conditions can be carried out. Start the test device, and the detection device 8 monitors the various data of the steel pipe in real time during the stress process and transmits the data to the display 9.

[0076] Fully constrained test operation: According to the diameter of the steel pipe, first adjust the position of the movable sleeve 42 in the installation component 4 on the fixed rod 41, and fix it by the fixing bolt 45. Then, start the first double-headed hydraulic telescopic rod 54 in the fixing device 5, so that it pushes the extension rod 55 and the arc-shaped fixing block 56 to move until the arc-shaped fixing block 56 tightly hugs both ends of the steel pipe to achieve a fully constrained state. When conducting three-point and four-point bending static and fatigue tests, the detection device 8 monitors the data and transmits it to the display 9. The experimenters evaluate the performance of the steel pipe under fully constrained conditions based on the data.

[0077] The experiment involving only changing the angle is as follows: First, place the steel pipe on the placement seat 32 and fix it in place. Start the threaded rod 61 in the connecting assembly 6 to rotate. Adjust the positions of the extension frame 62 and the hydraulic connecting frame 63 so that the position of the rotating device 7 is adapted to the steel pipe. Then, start the second double-headed hydraulic telescopic rod 73 in the rotating device 7 so that the arc-shaped extrusion block 75 clamps the steel pipe. Next, start the motor 77. The motor 77 drives the circular block 71 to rotate, thereby changing the angle of the steel pipe. During the experiment, the detection device 8 monitors the status data of the steel pipe in real time and transmits it to the display 9 to provide a basis for evaluating the performance of the steel pipe under different angle constraints.

[0078] Fatigue test operation: Set the constraint conditions of the steel pipe (free end, fully constrained or only change angle) according to the test requirements. Set the detection frequency and data acquisition time interval of the detection device 8 through the external control system. Start the test device to simulate the process of the steel pipe repeatedly bearing bending stress in actual working conditions. The detection device 8 continuously collects the data of the steel pipe in the fatigue test process and transmits it to the display 9 in real time. The tester can analyze the fatigue life and reliability of the steel pipe based on the data on the display 9.

[0079] Compared with related technologies, the multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing device provided by the present invention has the following advantages:

[0080] This invention provides a multi-boundary condition full-size steel pipe three- and four-point bending static and fatigue test device. The first lifting rod 31, the placement seat 32, the base 33, the second lifting rod 34, and the fixed seat 35 are set on the telescopic plates 2 on both sides of the operating table 1 to place the pipe and perform free end and fully constrained test operations. The surface of the fixed seat 35 is provided with the mounting component 4 and the fixing device 5, which are used in conjunction with the connecting component 6 and the rotating device 7 to facilitate the test operation of changing the pipe at multiple angles.

[0081] Second Embodiment

[0082] Please refer to the following: Figure 11 and Figure 12Based on the multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing apparatus provided in the first embodiment of this application, the second embodiment of this application proposes another multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing apparatus. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0083] Specifically, the difference between the multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing device provided in the second embodiment of this application is that, in the multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing device, a pulling assembly 11 is provided between the operating table 1 and the slide rail 81. The pulling assembly 11 includes a circular fixed rod 111, a pulling sleeve 112, a splicing bracket 113, a limiting bolt 114, and a circular stop 115. The circular fixed rod 111 is connected to the surface of the operating table 1, the pulling sleeve 112 is sleeved on the surface of the circular fixed rod 111, the splicing bracket 113 is connected between the pulling sleeve 112 and the slide rail 81, the limiting bolt 114 is provided between the pulling sleeve 112 and the circular fixed rod 111, and the circular stop 115 is connected to the top end of the circular fixed rod 111.

[0084] The circular fixing rod 111 and the pulling sleeve 112 can be used to adjust the up and down position of the detection device 8. Multiple limiting holes adapted to the limiting bolt 114 are provided on the surface of the circular fixing rod 111.

[0085] The working principle of the multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing device provided by this invention is as follows:

[0086] When using the device, to adjust the position of the detection device 8, first remove the limiting bolt 114 between the pulling sleeve 122 and the circular fixed rod 111. After the limiting bolt 114 is removed, the device moves up and down by pulling the slide rail 81 under the action of the splicing bracket 113 and the pulling sleeve 112. When the detection device 8 is adjusted to the appropriate position, the limiting bolt 114 passes through the pulling sleeve 112 and connects with the circular fixed rod 111.

[0087] Compared with related technologies, the multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing device provided by the present invention has the following advantages:

[0088] This invention provides a multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue test device. A circular fixing rod 111, a pulling sleeve 112, a splicing bracket 113, a limit bolt 114, and a circular stop block 115 are set between the operating table 1 and the slide rail 81 to facilitate the adjustment of the vertical position of the entire testing device 8 during use.

[0089] Third Embodiment

[0090] Please refer to the following: Figure 13 Based on the multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing apparatus provided in the first embodiment of this application, the third embodiment of this application proposes another multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing apparatus. The third embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the third embodiment will not affect the separate implementation of the first embodiment.

[0091] Specifically, the difference between the multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing device provided in the third embodiment of this application is that a disassembly assembly 12 is provided between the fixed base 35 and the fixed rod 41 in the multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing device. The disassembly assembly 12 includes an installation block 121, a threaded block 122 and a threaded connecting sleeve 123. The threaded block 122 is connected to the surface of the fixed base 35, the installation block 121 is sleeved on the surface of the threaded block 122, and the threaded connecting sleeve 123 is threadedly connected to the surface of the threaded block 122.

[0092] A mounting through hole adapted to the threaded block 121 is provided on the surface of the mounting block 122. The threaded block 122 and the threaded connecting sleeve 123 can fix the mounting block 122.

[0093] The working principle of the multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing device provided by this invention is as follows:

[0094] When using, when disassembling the fixed base 35 and the fixed rod 41, first remove the threaded connecting sleeve 123 on the surface of the threaded block 122. After the threaded connecting sleeve 123 is removed, pull the fixed rod 41 to separate the mounting block 121 from the threaded block 122.

[0095] Compared with related technologies, the multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing device provided by the present invention has the following advantages:

[0096] This invention provides a multi-boundary condition full-size steel pipe three- and four-point bending static and fatigue test device. An installation block 121, a threaded block 122, and a threaded connecting sleeve 123 are provided between the fixed seat 35 and the fixed rod 41 to facilitate the installation and disassembly of the installation assembly 4 with the fixing device 5 and the fixed seat 35.

[0097] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing apparatus, characterized in that, include: The system includes an operating table, two telescopic plates, two placement devices, two mounting components, two fixing devices, two connecting components, two rotating devices, a detection device, and a display. The two telescopic plates are respectively disposed at both ends of the operating table; The two placement devices are respectively disposed on the surfaces of the two telescopic plates. Each placement device includes a first lifting rod, a placement seat, a base, a second lifting rod, and a fixed seat. The first lifting rod is connected to the surface of the telescopic plate, the placement seat is connected to the top of the first lifting rod, the base is connected to the side of the placement seat, the second lifting rod is installed on the surface of the base, and the fixed seat is connected to the top of the second lifting rod through a connecting block. The two mounting components are respectively disposed on the top of the two fixing bases; The two fixing devices are respectively disposed on one side of the two mounting components; The two connecting components are respectively disposed on one side of the two placement seats; The two rotating devices are respectively disposed on one side of the two connecting components; The detection device is located at the center of the operating table surface, and the display is mounted on one side of the operating table surface.

2. The multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing apparatus according to claim 1, characterized in that, The mounting assembly includes a fixed rod, a movable sleeve, a circular rod, a hydraulic adjusting rod, a fixing bolt, and a stop. The fixed rod is connected to the top of the fixed base, the movable sleeve is fitted onto the surface of the fixed rod, the circular rod is connected to one side of the movable sleeve, the hydraulic adjusting rod is connected to one end of the circular rod, the fixing bolt is disposed between the movable sleeve and the fixed rod, and the stop is connected to the top of the fixed rod.

3. The multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing apparatus according to claim 1, characterized in that, The fixing device includes an L-shaped fixing rod, a telescopic rod, a fixing ring, a first double-headed hydraulic telescopic rod, two extension rods, and two arc-shaped fixing blocks. The L-shaped fixing rod is connected to one end of the hydraulic adjusting rod, the telescopic rod is connected to the bottom end of the L-shaped fixing rod, the first double-headed hydraulic telescopic rod is connected to the bottom end of the telescopic rod through the fixing ring, the two extension rods are respectively connected to both ends of the first double-headed hydraulic telescopic rod, and the two arc-shaped fixing blocks are respectively connected to one end of the two extension rods.

4. The multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing apparatus according to claim 1, characterized in that, The connecting assembly includes a threaded rod, an extension frame, a hydraulic connection frame, and two threaded sleeves. The threaded rod is disposed inside the placement seat, the extension frame is connected to one end of the threaded rod, the hydraulic connection frame is connected to one end of the extension frame, and both threaded sleeves are fitted onto the surface of the threaded rod.

5. The multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing apparatus according to claim 4, characterized in that, The rotating device includes a circular block, a connecting ring, a second double-headed hydraulic telescopic rod, two movable frames, two arc-shaped extrusion blocks, a connecting bracket, and a motor. The second double-headed hydraulic telescopic rod is connected to the center of the surface of the circular block through the connecting ring. The two movable frames are respectively connected to the two ends of the second double-headed hydraulic telescopic rod, and the two arc-shaped extrusion blocks are respectively connected to one end of the two movable frames.

6. The multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing apparatus according to claim 5, characterized in that, The connecting bracket is connected to one side of the circular block, and the motor is connected to one side of the connecting bracket and to the hydraulic connecting frame.

7. The multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing apparatus according to claim 1, characterized in that, The detection device includes a slide rail, two telescopic frames, two detection heads, and two bolts. The slide rail is connected to the center of the operating table surface. The two telescopic frames are respectively disposed on both sides of the slide rail surface. The two detection heads are respectively connected to the top of the two telescopic frames. The two bolts are respectively disposed between the two telescopic frames and the slide rail.

8. The multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing apparatus according to claim 1, characterized in that, A moving device is provided between the operating platform and the two telescopic plates. The moving device includes a third double-headed hydraulic telescopic rod, two fixed brackets and a limiting ring. The third double-headed hydraulic telescopic rod is connected to the bottom of the operating platform through the limiting ring, and the two fixed brackets are respectively connected to the two ends of the third double-headed hydraulic telescopic rod.

9. The multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing apparatus according to claim 7, characterized in that, A pulling assembly is provided between the operating table and the slide rail. The pulling assembly includes a circular fixed rod, a pulling sleeve, a splicing bracket, a limiting bolt, and a circular stop. The circular fixed rod is connected to the surface of the operating table, the pulling sleeve is fitted onto the surface of the circular fixed rod, the splicing bracket is connected between the pulling sleeve and the slide rail, the limiting bolt is located between the pulling sleeve and the circular fixed rod, and the circular stop is connected to the top of the circular fixed rod.

10. The multi-boundary-condition full-size steel pipe three- and four-point bending static and fatigue testing apparatus according to claim 2, characterized in that, A disassembly assembly is provided between the fixed base and the fixed rod. The disassembly assembly includes an mounting block, a threaded block, and a threaded connecting sleeve. The threaded block is connected to the surface of the fixed base, the mounting block is sleeved on the surface of the threaded block, and the threaded connecting sleeve is threadedly connected to the surface of the threaded block.

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