Non-adhesive flexible pipeline composite loading test device, system and test method

Abstract

The invention relates to a combined loading test device, system and method for a non-adhesive flexible pipeline, and the device comprises a stretching mechanism which comprises a matrix frame, a first driving source disposed at one side of the matrix frame, a moving module disposed in the matrix frame and slidably connected with the matrix frame, and a fixed module fixedly disposed in the matrix frame; the acting end of the first driving source is in transmission connection with the moving module to apply a load in a first direction; the bending mechanism comprises a second driving source and at least one bending action module connected with the action end of the second driving source; the second driving source applies a load in a second direction, and the second direction is perpendicular to the first direction; the test sample tube is axially arranged in the base body frame, the two ends of the test sample tube are hinged to the movable module and the fixed module respectively, and the test sample tube is clamped by the bending action module. The integrated experiment test system can simulate the complex combined load working condition and is closer to the actual working condition.

Description

Technical Field

[0001] The present invention relates to the technical field of testing devices, and in particular to a testing device, system and method for testing the bending stiffness and axial stiffness of a non-bonded flexible hose under high temperature, high pressure and high tension. Background Art

[0002] Non-adhesive flexible pipes are laid in the ocean to transport a high-temperature, high-pressure mixture of oil, gas, and water. Under the combined effects of ocean currents, sea breezes, and waves, the pipes will locally bend. Simultaneously, due to their own weight and the water depth, the hoses and connector terminals are subjected to axial tension. The hose's ability to resist deformation is determined by its stiffness. Axial stiffness and bending stiffness are crucial parameters for calculating the hose's fatigue life.

[0003] Most of the test systems in the existing technology directly measure and calculate the bending stiffness and axial stiffness, which cannot add multiple working conditions of the product under actual marine production work, and the calculated stiffness has poor accuracy. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention discloses a composite loading test device, system and test method for non-bonded flexible pipes.

[0005] The technical solutions adopted in the present invention are as follows: In a first aspect, a non-bonded flexible pipe composite loading test device is provided, comprising: The stretching mechanism includes a base frame, a first driving source provided on one side of the base frame, a movable module provided in the base frame and slidably connected to the base frame, and a fixed module fixed in the base frame; an active end of the first driving source is transmission-connected to the movable module to apply a load in a first direction; The bending mechanism includes a second driving source and at least one bending action module connected to an action end of the second driving source; the second driving source applies a load in a second direction, the second direction being perpendicular to the first direction; The test sample tube is horizontally axially arranged in the base frame, two ends of the test sample tube are hinged to the moving module and the fixed module respectively, and the test sample tube is clamped by the bending module.

[0006] In one embodiment of the present invention, it further includes a displacement measuring module for measuring the displacement change of the test sample tube in the first direction; the displacement measuring module includes at least one pull-wire sensor; the fixed end of the pull-wire sensor is installed at one end of the test sample tube and is parallel to the axial direction of the test sample tube, and the other end of the pull-wire sensor is fixed to the other end of the test sample tube, and the pull wire of the pull-wire sensor is in the same straight line as the axis of the test sample tube.

[0007] In one embodiment of the present invention, a bending radius measurement module for measuring the bending radius is further included; the bending radius measurement module includes two displacement sensors respectively installed on both sides of the test sample tube; the two displacement sensors simultaneously measure the displacement change of the test sample tube in the second direction.

[0008] In one embodiment of the present invention, the mobile module includes a mobile body, at least one set of first rolling elements provided on the mobile body and rollingly engaged with the base frame, and a first hinge seat detachably connected to the mobile body.

[0009] In one embodiment of the present invention, the fixing module includes a fixing body and a second hinged seat detachably connected to the fixing body.

[0010] In a second aspect, a non-bonded flexible pipe composite loading test system is provided, comprising: The non-bonded flexible pipe composite loading test device according to any one of claims 1 to 5; A temperature control module is connected to the non-bonded flexible pipe composite loading test device and injects a heat-conducting medium into the test sample pipe; The pressure control module is connected to the non-bonded flexible pipe composite loading test device to increase the pressure of the heat-conducting medium in the test sample pipe.

[0011] In one embodiment of the present invention, the temperature control module includes a circulating oil pump, a first high-temperature oil tank and a sample tube oil pump; the circulating oil pump and the first high-temperature oil tank, the first high-temperature oil tank and the sample tube oil pump are all connected by pipelines; the sample tube oil pump is connected to the medium inlet of the test sample tube through a pipeline; the medium outlet of the test sample tube is connected to the first high-temperature oil tank through a pipeline.

[0012] In one embodiment of the present invention, the pressure control module includes a boost pump and a second high-temperature oil tank; the boost pump and the second high-temperature oil tank are connected by a pipeline; the boost pump and the pressure inlet of the test sample tube are connected by a pipeline.

[0013] In one embodiment of the present invention, a temperature sensor and a pressure sensor are provided on the test sample tube.

[0014] In a third aspect, a method for composite loading testing of non-bonded flexible pipes is provided, which utilizes the aforementioned composite loading testing system for non-bonded flexible pipes and includes the following steps: The temperature control module injects heat-conducting medium into the test sample tube, and after it is filled, it performs a temperature-raising cycle to raise the temperature to the test temperature. After the temperature stabilizes, the pressure control module increases the pressure of the medium in the test sample tube. The stretching mechanism applies a load in a first direction to the test sample tube until a test load value is reached, and the displacement measurement module obtains displacement change data of the test sample tube in the first direction, and calculates the axial stiffness of the test sample tube based on the displacement change data of the test sample tube in the first direction; The bending mechanism applies a load in a second direction to the test sample tube until the test load value is reached. The bending radius measurement module obtains displacement change data of the test sample tube in the second direction and calculates the bending stiffness of the test sample tube based on the displacement change data of the test sample tube in the second direction.

[0015] The above technical solution of the present invention has the following advantages over the prior art: The non-bonded flexible pipeline composite loading test system described in this invention reduces the cost of individual test equipment. This system integrates a tensile mechanism, a bending mechanism, a temperature control module, and a pressure control module. Its high level of integration allows it to integrate multiple sets of individual test equipment, reducing infrastructure and lowering the cost of testing offshore oil and gas pipelines.

[0016] The composite loading test for unbonded flexible pipes described in this invention simulates the mechanical response of pipes under more realistic combined operating conditions. Data monitoring of the mechanical response of pipes under complex combined operating conditions is a domestically-developed field, enabling integrated testing of pipes under diverse combined loading conditions.

[0017] The non-bonded flexible pipe composite loading test system of the present invention provides more comprehensive monitoring data and more accurate monitoring results. Based on the experimental data collected and processed by the equipment, more comprehensive feedback can be provided to the design, improving and optimizing design capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0019] Figure 1 It is a structural schematic diagram of the non-bonded flexible pipe composite loading test device in the present invention.

[0020] Figure 2 It is a structural schematic diagram of the stretching mechanism in the present invention.

[0021] Figure 3 yes Figure 2 Enlarged schematic diagram of point A in the middle.

[0022] Figure 4 yes Figure 2 Enlarged schematic diagram of point B in the middle.

[0023] Figure 5 It is a structural schematic diagram of the bending mechanism and the test sample tube in the present invention.

[0024] Figure 6 It is a structural schematic diagram of the bending mechanism in the present invention.

[0025] Figure 7 Schematic diagram of the non-bonded flexible pipe composite loading test system of the present invention.

[0026] Figure 8 Schematic diagram of the test sample pipe before and after the second direction load is applied in the present invention.

[0027] Description of the accompanying drawings: 10. Stretching mechanism; 11. Base frame; 12. Connecting seat; 13. Stretching wall column; 14. First driving source; 15. Moving module; 151. Moving body; 152. First rolling element; 153. First connecting rod; 154. First support; 155. Second rolling element; 156. First hinge seat; 16. Fixing module; 161. Fixed body; 162. Second hinge seat; 163. Second connecting rod; 164. Second support; 165. Third rolling element; 166. Fastener; 17. Fixing seat; 20. Bending mechanism; 21. Second driving source; 22. Fixed beam; 23. Base; 24. Guide shaft; 25. Movable beam; 26. Bending action module; 261. Upper shaft; 262. Connecting element; 263. Lower shaft; 27. Bending radius measurement module; 28. Lifting element; 30. Test sample tube; 31. Main body; 32. First joint flange; 33. First hinged flange; 34. Second joint flange; 35. Second hinged flange; 401. Circulating oil pump; 402. First high-temperature oil tank; 403. Sample tube oil pump; 404. First valve; 405. Second valve; 406. Third valve; 407. Fourth valve; 408. Compressed air inlet; 409. Compressed air treatment device; 410. Compressed air solenoid valve; 411. Booster pump; 412. One-way valve; 413. First high-temperature pressure sensor; 414. Fifth valve; 415. Second high-temperature pressure sensor; 416. Pressure output port; 417. Pressure inlet; 418. Second high-temperature oil tank; 419. Sixth valve; 420. Seventh valve; 421. Eighth valve; 422. Ninth valve; 423. Tenth valve; 424. Eleventh valve. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0029] The foregoing and other technical aspects, features, and functions of the present invention will be more clearly understood in the following detailed description of the embodiments with reference to the accompanying drawings. Directional terms such as up, down, left, right, front, and back, used in the following embodiments, are merely references to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes only and are not intended to limit the present invention. Furthermore, throughout the embodiments, the same reference numerals denote the same elements. Example

[0030] Reference Figure 1 As shown, a non-bonded flexible pipe composite loading test device includes a stretching mechanism 10 and a bending mechanism 20.

[0031] Among them, combined Figures 2 to 4 The stretching mechanism 10 includes a base frame 11, a first driving source 14 disposed on one side of the base frame 11, a movable module 15 disposed within the base frame 11 and slidably connected to the base frame 11, and a fixed module 16 fixed within the base frame 11. The active end of the first driving source 14 is in transmission connection with the movable module 15 to apply a load in a first direction.

[0032] Specifically, the active end of the first drive source 14 is connected to the connecting base 12, which is provided with a plurality of tensile wall columns 13. These tensile wall columns 13 are connected to the mobile module 15, thereby achieving a transmission connection between the active end of the first drive source 14 and the mobile module 15, thereby applying a load in the first direction. The first drive source 14 is a commercially available hydraulic cylinder, which can be selected and adjusted by those skilled in the art as needed.

[0033] Furthermore, to ensure that the axial direction of the test sample tube 30 and the axial direction of the first driving source 14 are in the same straight line, a fixing seat 17 can be optionally provided, on which the first driving source 14 and the connecting seat 12 are installed, and the height of the fixing seat 17 is designed as needed.

[0034] The mobile module 15 includes a mobile body 151, at least one set of first rolling elements 152 disposed on the mobile body 151 and in rolling engagement with the base frame 11, and a first hinged seat 156 detachably connected to the mobile body 151. The first rolling elements 152 can be disposed on the side walls of the mobile body 151 and can be rollers. The first rolling elements 152 can serve as guides, ensuring that the mobile body 151 slides smoothly along a predetermined trajectory within the base frame 11. This guidance prevents the mobile body 151 from drifting or getting stuck during sliding.

[0035] Furthermore, to improve the positioning accuracy and motion repeatability of the moving body 151, the moving module 15 further includes a first connecting rod 153, two first supports 154 provided on the base frame 11, and a second rolling element 155. The first connecting rod 153 axially passes through the two first supports 154. The second rolling elements 155 are provided at both ends of the first connecting rod 153, and the second rolling elements 155 can roll along the base frame 11. The second rolling elements 155 can be rollers.

[0036] The fixing module 16 includes a fixing body 161 and a second hinge seat 162 detachably connected to the fixing body 161 .

[0037] It should be noted that "detachable connection" refers to a connection method in which the connecting part can be removed from the connected part without destroying the connecting part or the connected part during assembly, for example, the fixed body 161 and the base frame 11 are connected together by threaded fasteners 166 such as bolts, nuts, and screws.

[0038] The inner walls of both sides of the base frame 11 are provided with slideways along the length thereof. The movable body 151 can slide along the slideways, and the fixed body 161 can also slide along the slideways before being fixed. The fixed module 16 further includes a second connecting rod 163, two second supports 164 provided on the base frame 11, and a third rolling element 165. The second connecting rod 163 axially passes through the two second supports 164. The third rolling elements 165 are provided at both ends of the second connecting rod 163. Before the fixed body 161 is fixed, the third rolling elements 165 can roll along the base frame 11. The second rolling elements 155 can be rollers.

[0039] Combine Figure 5 and Figure 6 The bending mechanism 20 includes a second drive source 21 and at least one bending action module 26 connected to the action end of the second drive source 21. The second drive source 21 applies a load in a second direction, which is perpendicular to the first direction. The second drive source 21 is a commercially available hydraulic cylinder, which can be selected and adjusted by a person skilled in the art as needed.

[0040] Specifically, the bending mechanism 20 also includes a fixed beam 22, a base 23, multiple guide shafts 24, and a movable beam 25. The fixed beam 22 and the test tube 30 are arranged perpendicularly, while the movable beam 25 and the test tube 30 are arranged parallel. A second drive source 21 is mounted on the fixed beam 22, the base 23 supports the fixed beam 22, and multiple guide shafts 24 connect the fixed beam 22 and the movable beam 25. A bending module 26 is fixed to the movable beam 25.

[0041] The bending module 26 includes an upper shaft 261, a connecting element 262, and a lower shaft 263. The upper shaft 261 and the lower shaft 263 are arranged in parallel. The connecting element 262 connects the upper shaft 261 and the lower shaft 263. The test tube 30 passes through the gap between the upper shaft 261 and the lower shaft 263. The connecting element 262 can use bolts and nuts to connect the upper shaft 261 and the lower shaft 263.

[0042] Preferably, the diameters of the two ends of the upper shaft 261 and the lower shaft 263 are larger, and the middle diameter is smaller, that is, the end diameters of the upper shaft 261 and the lower shaft 263 are larger than the middle diameter. Then, the parts where the upper shaft 261 and the lower shaft 263 contact the test sample tube 30 are set to be concave to prevent the second driving source 21 from colliding hard with the bending action module 26 when applying the second direction load, thereby damaging the test sample tube 30.

[0043] Furthermore, the bending mechanism 20 further includes a lifting element 28. The lifting element 28 provides a convenient connection point so that the bending mechanism 20 can be transported and installed using a lifting device. The lifting element 28 can be a lifting ring.

[0044] The test sample tube 30 is horizontally axially arranged in the base frame 11 . Both ends of the test sample tube 30 are hinged to the moving module 15 and the fixing module 16 respectively, and the test sample tube 30 is clamped by the bending module 26 .

[0045] It should be noted that, since the test sample tube 30 is tested in this embodiment, the first direction refers to the axial direction of the test sample tube 30 , and the second direction refers to the direction perpendicular to the axial direction of the test sample tube 30 .

[0046] In this embodiment, the non-bonded flexible pipe composite loading test device also includes a displacement measurement module for measuring the displacement change of the test sample tube 30 in the first direction. The displacement measurement module includes at least one pull-wire sensor. The fixed end of the pull-wire sensor is installed at one end of the test sample tube 30 and is parallel to the axial direction of the test sample tube 30. The other end of the pull-wire sensor is fixed to the other end of the test sample tube 30, and the pull wire of the pull-wire sensor is on the same straight line as the axis of the test sample tube 30. When the test sample tube 30 undergoes axial displacement, the pull wire of the pull-wire sensor will be pulled out or retracted as the test sample tube 30 moves. The rotary encoder inside the pull-wire sensor will calculate the extended length of the pull wire based on the rotation angle of the reel, thereby obtaining the axial displacement of the test sample tube 30.

[0047] In this embodiment, the non-bonded flexible pipe composite loading test apparatus further includes a bending radius measurement module 27 for measuring the bending radius. This module comprises two displacement sensors mounted on either side of a test pipe sample 30. These two displacement sensors simultaneously measure the displacement change of the test pipe sample 30 in the second direction. When the test pipe sample 30 is subjected to pressure, it displaces vertically, and two laser sensors measure the displacement change of the test pipe sample 30.

[0048] In this embodiment, the test sample tube 30 includes a main body 31, a first joint flange 32, a first hinged flange 33, a second joint flange 34, and a second hinged flange 35. The first joint flange 32 and the second joint flange 34 are respectively provided at opposite ends of the main body 31. The first hinged flange 33 and the first joint flange 32 are flange-connected, while the second joint flange 34 and the second hinged flange 35 are flange-connected. The first hinged flange 33 is hingedly connected to the first hinge seat 156, and the second hinged flange 35 is hingedly connected to the second hinge seat 162, thereby allowing the test sample tube 30 to rotate freely within a certain range.

[0049] The working principle of this embodiment is as follows: The stretching mechanism 10 applies a load in a first direction to the test sample tube 30 , and when the load reaches a test load value, the displacement measurement module obtains displacement change data of the test sample tube 30 in the first direction.

[0050] The bending mechanism 20 applies a load in the second direction to the test sample tube 30 , and when the load reaches the test load value, the bending radius measurement module 27 obtains displacement change data of the test sample tube 30 in the second direction. Example

[0051] Based on Example 1, Figure 7 As shown, a non-bonded flexible pipe composite loading test system includes the non-bonded flexible pipe composite loading test device provided in Example 1, a temperature control module, and a pressure control module.

[0052] The temperature control module is connected to the non-bonded flexible pipe composite loading test device to inject a heat-conducting medium into the test sample pipe 30. Specifically, the temperature control module includes a circulating oil pump 401, a first high-temperature oil tank 402, and a sample pipe oil pump 403. The circulating oil pump 401 and the first high-temperature oil tank 402, as well as the first high-temperature oil tank 402 and the sample pipe oil pump 403, are all connected by pipelines. The sample pipe oil pump 403 is connected to the medium inlet of the test sample pipe 30 via a pipeline. The medium outlet of the test sample pipe 30 is connected to the first high-temperature oil tank 402 via a pipeline.

[0053] The pressure control module is connected to the non-bonded flexible pipe composite loading test apparatus to increase the pressure of the heat transfer medium within the test pipe sample 30. Specifically, the pressure control module includes a booster pump 411 and a second high-temperature oil tank 418. The booster pump 411 and the second high-temperature oil tank 418 are connected by a pipeline. The booster pump 411 is also connected to the pressure inlet 417 of the test pipe sample 30 via a pipeline.

[0054] In this embodiment, each connecting pipe is equipped with one or more valves, allowing operators to open or close the valves according to test needs. Specifically, the pipe between the sample pipe pump 403 and the medium inlet of the test sample pipe 30 is equipped with a first valve 404, the medium inlet of the test sample pipe 30 is equipped with a second valve 405, the medium outlet of the test sample pipe 30 is equipped with a third valve 406, and the medium outlet of the test sample pipe 30 is equipped with a fourth valve 407. The pipe between the booster pump 411 and the pressure inlet 417 of the test sample pipe 30 is equipped with a one-way valve 412 and a fifth valve 414. A pressure output port 416 is provided between the fifth valve 414 and the pressure inlet 417. A first high-temperature pressure sensor 413 is provided between the one-way valve 412 and the fifth valve 414, and a second high-temperature pressure sensor 415 is provided between the fifth valve 414 and the pressure output port 416. The pipe between the booster pump 411 and the second high-temperature oil tank 418 is equipped with a sixth valve 419 and a seventh valve 420. The second high-temperature oil tank 418 is further provided with a recovery pipeline, on which an eighth valve 421 , a ninth valve 422 , a tenth valve 423 and an eleventh valve 424 are provided.

[0055] The valve can be selected from one of the high-temperature pneumatic ball valve, high-temperature manual ball valve and high-temperature manual valve.

[0056] In this embodiment, the booster pump 411 is a high-temperature gas-driven booster pump, and the pressure control module also includes a compressed air processing device 409 and a compressed air solenoid valve 410. The compressed air enters the compressed air processing device 409 through the compressed air inlet 408. The compressed air processing device 409 and the booster pump 411 are connected by a pipeline, and a compressed air solenoid valve 410 is provided on the pipeline.

[0057] In this embodiment, a temperature sensor and a pressure sensor are provided on the test sample tube 30. The temperature sensor and the pressure sensor can monitor the changing data of the test sample tube 30.

[0058] The working principle of this embodiment is as follows: The temperature control module injects heat transfer medium into the test sample tube 30 , and after it is filled, performs a temperature increase cycle to raise the temperature to the test temperature. After the temperature stabilizes, the pressure control module increases the pressure of the medium in the test sample tube 30 .

[0059] The stretching mechanism 10 applies a load in a first direction to the test sample tube 30 until the test load value is reached. The displacement measurement module obtains displacement change data of the test sample tube 30 in the first direction and calculates the axial stiffness of the test sample tube 30 based on the displacement change data of the test sample tube 30 in the first direction.

[0060] The non-bonded flexible pipe composite loading test system provided in this embodiment can more realistically simulate actual operating conditions, including high temperature, high pressure, and high tension conditions. It can predict the axial stiffness and bending stiffness under different temperatures and pressures, and reveal the influence of temperature and pressure on stiffness.

[0061] Specifically, the axial stiffness can be solved by the following formula:

[0062] Where: EA is the axial tensile stiffness of the test sample tube 30, F is the first direction force applied by the first driving source 14, i.e., the axial tension, l is the length of the test sample tube 30, is the elongation of the test sample tube 30.

[0063] The bending mechanism 20 applies a load in the second direction to the test sample tube 30 until the test load value is reached. The bending radius measurement module 27 obtains displacement change data of the test sample tube 30 in the second direction and calculates the bending stiffness of the test sample tube 30 based on the displacement change data of the test sample tube 30 in the second direction.

[0064] Specifically, if Figure 8 As shown, the bending stiffness can be solved by the following formula: because

[0065] but

[0066] Right now

[0067] Can get because

[0068] but

[0069] Where: EI is the bending stiffness of the test tube 30, F is the second direction force applied by the second driving source 21, i.e., the vertical force, and L1 is Figure 5 The length of the test sample tube 30 between the first joint flange 32 and the second driving source 21 is L2. Figure 6 The horizontal length of the test sample tube 30 between the upper shaft 261 and the lower shaft 263, R is Figure 5The curvature radius of the pipe test sample 30 between the first joint flange 32 and the second joint flange 34 after bending loading, h is Figure 5 The second driving source 21 is relative to the vertical displacement of the test sample pipe 30 in the initial horizontal state.

[0070] It should be noted that F and h can be monitored in real time by force sensors and displacement sensors, L1 and L2 can be measured, and EI and R can be calculated and obtained according to the above formulas.

[0071] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0072] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A non-bonded flexible pipe composite loading test device, characterized in that: include: A stretching mechanism (10) comprises a base frame (11), a first driving source (14) provided on one side of the base frame (11), a moving module (15) provided in the base frame (11) and slidably connected to the base frame (11), and a fixed module (16) fixed in the base frame (11); an active end of the first driving source (14) is in transmission connection with the moving module (15) to apply a load in a first direction; The bending mechanism (20) comprises a second driving source (21) and at least one bending action module (26) connected to an action end of the second driving source (21); the second driving source (21) applies a load in a second direction, the second direction being perpendicular to the first direction; The test sample tube (30) is horizontally axially arranged in the base frame (11), and the two ends of the test sample tube (30) are respectively hinged to the moving module (15) and the fixed module (16), and the test sample tube (30) is clamped by the bending action module (26).

2. The non-bonded flexible pipe composite loading test device according to claim 1 is characterized in that: The invention also includes a displacement measuring module for measuring the displacement change of the test sample tube (30) in the first direction; the displacement measuring module includes at least one pull-wire sensor; the fixed end of the pull-wire sensor is installed at one end of the test sample tube (30) and is parallel to the axial direction of the test sample tube (30); the other end of the pull-wire sensor is fixed to the other end of the test sample tube (30), and the pull wire of the pull-wire sensor is on the same straight line as the axis of the test sample tube (30).

3. The non-bonded flexible pipe composite loading test device according to claim 1 is characterized in that: It also includes a bending radius measurement module (27) for measuring the bending radius; the bending radius measurement module (27) includes two displacement sensors respectively installed on both sides of the test sample tube (30); the two displacement sensors simultaneously measure the displacement change of the test sample tube (30) in the second direction.

4. The non-bonded flexible pipe composite loading test device according to claim 1 is characterized in that: The mobile module (15) comprises a mobile body (151), at least one set of first rolling elements (152) provided on the mobile body (151) and rollingly engaged with the base frame (11), and a first hinge seat (156) detachably connected to the mobile body (151).

5. The non-bonded flexible pipe composite loading test device according to claim 1 is characterized in that: The fixing module (16) comprises a fixing body (161) and a second hinge seat (162) detachably connected to the fixing body (161).

6. A non-bonded flexible pipe composite loading test system, characterized in that: include: The non-bonded flexible pipe composite loading test device according to any one of claims 1 to 5; A temperature control module is connected to the non-bonded flexible pipe composite loading test device and injects a heat-conducting medium into the test sample pipe (30); The pressure control module is connected to the non-bonded flexible pipe composite loading test device and increases the pressure of the heat-conducting medium in the test sample pipe (30).

7. The non-bonded flexible pipe composite loading test system according to claim 6, characterized in that: The temperature control module comprises a circulating oil pump (401), a first high-temperature oil tank (402), and a sample tube oil pump (403); the circulating oil pump (401) and the first high-temperature oil tank (402), as well as the first high-temperature oil tank (402) and the sample tube oil pump (403) are all connected via pipelines; the sample tube oil pump (403) is connected to a medium inlet of the test sample tube (30) via a pipeline; and a medium outlet of the test sample tube (30) is connected to the first high-temperature oil tank (402) via a pipeline.

8. The non-bonded flexible pipe composite loading test system according to claim 6, characterized in that: The pressure control module comprises a boost pump (411) and a second high-temperature oil tank (418); the boost pump (411) and the second high-temperature oil tank (418) are connected via a pipeline; the boost pump (411) and the pressure inlet of the test sample tube (30) are connected via a pipeline.

9. The non-bonded flexible pipe composite loading test system according to claim 6, characterized in that: A temperature sensor and a pressure sensor are provided on the test sample tube (30).

10. A composite loading test method for non-bonded flexible pipes, characterized in that: The non-bonded flexible pipe composite loading test system according to any one of claims 6 to 9 comprises the following steps: The temperature control module injects a heat-conducting medium into the test sample tube (30), and after the tube is filled, performs a temperature-raising cycle to raise the temperature to the test temperature; after the temperature stabilizes, the pressure control module increases the pressure of the medium in the test sample tube (30); The stretching mechanism (10) applies a load in a first direction to the test sample tube (30) until a test load value is reached, and the displacement measurement module obtains displacement change data of the test sample tube (30) in the first direction, and calculates the axial stiffness of the test sample tube (30) based on the displacement change data of the test sample tube (30) in the first direction; The bending mechanism (20) applies a load in a second direction to the test sample tube (30) until a test load value is reached, and the bending radius measurement module (27) obtains displacement change data of the test sample tube (30) in the second direction, and calculates the bending stiffness of the test sample tube (30) based on the displacement change data of the test sample tube (30) in the second direction.

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