Flexible pipe bending fatigue testing device, system and method

Abstract

The invention discloses a flexible pipe bending fatigue test device, system and method. The flexible pipe bending fatigue test device comprises a support frame; the translation assembly is arranged on the supporting frame; the hose saddle is arranged on the translation assembly, the height of the hose saddle is adjustable, and the hose saddle is used for installing and protecting a test hose; the connecting plate is arranged on the translation assembly, the connecting plate and the hose saddle are arranged at an interval, and the connecting plate is connected with the hose saddle through a connecting rod; and the driving mechanism is connected with the hose saddle and / or the connecting plate, and the driving mechanism is used for driving the hose saddle and the connecting plate to reciprocate in the length direction of the translation assembly. The device can highly restore the actual fatigue working condition of the hose, can be flexibly adjusted, and is suitable for test hoses with different calibers.

Description

Technical Field

[0001] The present invention relates to the technical field of hose performance testing, and further to a hose bending fatigue testing device, system and method. Background Art

[0002] Ship-to-ship transfer hoses are dynamic connecting pipes used for ship-to-ship bunkering. They can be used for ship-to-ship and ship-to-shore transfer of LNG, as well as for transferring related media from FSRUs to terminals. Ship-to-ship transfer hoses are key components of ship-to-ship bunkering systems, and their performance determines the system's transmission reliability. In practice, the positional uncertainty between the two vessels caused by wind and waves can lead to bending fatigue. According to relevant regulations, ship-to-ship transfer hoses must undergo pressurized bending fatigue testing in a state of maximum fit.

[0003] Existing pipeline fatigue testing equipment mostly uses mechanical axial linear reciprocating stretching or radial cross-section reciprocating pressing actions on the pipeline, which cannot simulate the stress state of the ship-to-ship delivery hose during actual operation. As a result, the bending test of the ship-to-ship delivery hose cannot reproduce the actual bending fatigue state, affecting the accuracy of the test results.

[0004] Therefore, it is necessary to design a hose bending fatigue testing device, system and method to solve the above problems. Summary of the Invention

[0005] In response to the above technical problems, the purpose of the present invention is to provide a hose bending fatigue testing device, system and method that can highly restore the actual fatigue working conditions of the hose, can be flexibly adjusted, and is suitable for testing hoses of different calibers.

[0006] In order to achieve the above object, the present invention provides a hose bending fatigue testing device, comprising:

[0007] Support frame;

[0008] A translation assembly is provided on the support frame;

[0009] a hose saddle, disposed on the translation assembly and having an adjustable height, the hose saddle being used to mount and protect the test hose;

[0010] a connecting plate, provided on the translation assembly and spaced apart from the hose saddle, the connecting plate and the hose saddle being connected via a connecting rod;

[0011] A driving mechanism is connected to the hose saddle and / or the connecting plate, and is used to drive the hose saddle and the connecting plate to move back and forth in the length direction of the translation assembly.

[0012] In some embodiments, the translation assembly includes a guide rail and a first slider and a second slider adapted to be arranged on the guide rail, the guide rail is fixed on the support frame, the hose saddle is arranged on the first slider, and the connecting plate is arranged on the second slider, so that the hose saddle and the connecting plate can move in the length direction of the guide rail.

[0013] In some embodiments, the hose saddle includes a saddle body and a saddle bracket;

[0014] The saddle bracket includes a fixed bracket, a support plate and a coat bracket. The saddle body is connected to the fixed bracket. The fixed bracket is arranged on the coat bracket and can move up and down along the coat bracket. The coat bracket is fixedly or detachably connected to the support plate. The support plate is fixedly or detachably connected to the first slider.

[0015] In some embodiments, the saddle body includes a curved bottom plate and two side plates, the two side plates are fixed parallel to both sides of the curved bottom plate, and the fixing bracket is fixedly connected to the curved bottom plate;

[0016] The saddle bracket also includes a first adjustment mechanism, which includes a first handwheel, a first screw and a first nut. The first handwheel is fixed to the end of the first screw, and the first screw is adaptively connected to the first nut. The end of the first screw away from the first handwheel is connected to the saddle body or the fixed bracket, and the first nut is connected to the coat bracket or the support plate. Rotating the first handwheel can drive the fixed bracket to move up and down along the coat bracket.

[0017] In some embodiments, the driving mechanism includes a motor, a reduction gearbox, a rotating shaft, a rotating arm, a transmission pin, and a transmission connecting rod. The motor is mounted on the support frame, the driving shaft of the motor is connected to the rotating shaft through the reduction gearbox, the rotating shaft is connected to the rotating arm, the rotating arm is connected to the transmission connecting rod through the transmission pin, and the end of the transmission connecting rod away from the transmission pin is connected to the connecting plate, so that the motor can drive the connecting plate to reciprocate through the transmission connecting rod.

[0018] Wherein, the length of the transmission connecting rod is adjustable, and the length of the connecting rod is adjustable.

[0019] In some embodiments, the support frame includes a main frame, a foundation frame, a plurality of wheels, and a plurality of second adjustment mechanisms, wherein the foundation frame is fixed to the ground, and the wheels are mounted on the bottom of the main frame through the second adjustment mechanism;

[0020] The second adjustment mechanism includes a second hand wheel, a second screw and a second nut. The second hand wheel is fixed to the end of the second screw. The second screw is adaptively connected to the second nut. The end of the second screw away from the second hand wheel is connected to the wheel. The second nut is fixed to the main frame. Rotating the second hand wheel can drive the main frame to move up and down.

[0021] When the main body support is moved to a preset position, the main body support can be fixedly connected to the foundation support through a fixing piece.

[0022] In some embodiments, further comprising:

[0023] A test hose, wherein the test hose is adapted to be arranged on the hose saddle, and an end of the test hose is sealedly connected to the hose connector on the connecting plate;

[0024] The test hose is provided with a filling port, a pressure sensor, a temperature sensor and a drain valve. The filling port is used to add medium to the test hose, the pressure sensor is used to monitor the pressure in the test hose, the temperature sensor is used to monitor the temperature in the test hose, and the drain valve is used to discharge overpressure from the test hose.

[0025] According to another aspect of the present invention, the present invention further provides a hose bending fatigue testing system, comprising:

[0026] Two sets of hose bending fatigue testing devices as described in any one of the above items are arranged opposite to each other, and the ends of the two support frames close to each other are each provided with a fixing plate, and the two fixing plates are connected together by the connecting block;

[0027] One end of the test hose is sealed and connected to a connection plate of the hose bending fatigue testing device, and the other end is sealed and connected to a connection plate of another hose bending fatigue testing device.

[0028] According to another aspect of the present invention, the present invention further provides a hose bending fatigue testing method, wherein the hose is tested using the hose bending fatigue testing system as described above, comprising the steps of:

[0029] Step 1: Seal and connect the two ends of the test hose to the corresponding connecting plates respectively;

[0030] Step 2: Adjust the horizontal position and height of the hose saddle to the preset position to keep the test hose level between the connecting plate and the hose saddle;

[0031] Step 3: Adjust the position of the support frame according to the length of the test hose to ensure that the curvature of the midpoint of the hanging part of the test hose meets the test requirements;

[0032] Step 4: Fill the test hose with liquid nitrogen to the test pressure;

[0033] Step 5: Start the driving mechanism to drive the hose saddle and the connecting plate to move back and forth in the length direction of the translation assembly;

[0034] Step six: After bending a preset number of times, record the test data, wherein the test data includes at least one of the tube body pressure, the tube body temperature at different positions, the temperature of the driving mechanism, and the ambient temperature.

[0035] In some embodiments, the steps are further included:

[0036] Adjust the test pressure in step 4 and adjust the support frame position in step 3 to meet the new bending curvature requirements, and repeat the above test.

[0037] Compared with the prior art, the hose bending fatigue testing device, system, and method provided by the present invention have at least one of the following beneficial effects:

[0038] In the present invention, in actual ship-to-ship working conditions, the hose is connected between the two ships and is freely suspended in the middle of the rear part of the hose saddle. Due to the dynamic uncertainty of the movement between the two ships, the suspended hose is subjected to pressure bending fatigue load. The device can be used to perform a high degree of restoration test; the hose saddle can be adjusted in height and horizontal position to accommodate test samples of different calibers and lengths. The main frame is provided with wheels and can be adjusted in position to accommodate test samples of different lengths. The device adopts mechanical connection, and the relevant equipment can be disassembled and replaced. The assembly operation is simple, which greatly saves operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The following will explain optional implementation methods in a clear and easy-to-understand manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0040] Figure 1 2 is a schematic structural diagram of a hose bending fatigue testing device according to an optional embodiment of the present invention;

[0041] Figure 2 is a schematic structural diagram of a hose saddle according to an optional embodiment of the present invention;

[0042] Figure 3 2 is a schematic structural diagram of a hose bending fatigue testing system according to an optional embodiment of the present invention;

[0043] Figure 4 It is a front view of a hose bending fatigue testing system according to an optional embodiment of the present invention.

[0044] Description of Figure Numbers:

[0045] Support frame 1, main frame 11, fixed plate 111, connecting block 112, foundation frame 12, wheel 13, second adjusting mechanism 14, translation assembly 2, guide rail 21, first slider 22, second slider 23, hose saddle 3, saddle body 31, arc-shaped bottom plate 311, side plate 312, saddle frame 32, fixed frame 321, support plate 322, outer sleeve frame 323, first adjusting mechanism 324, connecting plate 4, connecting rod 41, driving mechanism 5, motor 51, reducer 52, rotating shaft 53, rotating arm 54, transmission pin 55, transmission connecting rod 56, test hose 6, filling port 61, pressure sensor 62, temperature sensor 63, drain valve 64. DETAILED DESCRIPTION

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other embodiments can be obtained based on these drawings without inventive work.

[0047] To simplify the drawings, only portions relevant to the invention are schematically depicted in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one component with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."

[0048] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0049] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0050] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0051] In one embodiment, the reference Figures 1 to 4A hose bending fatigue testing device provided by the present invention includes: a support frame 1, a translation assembly 2, a hose saddle 3, a connecting plate 4 and a driving mechanism 5; the translation assembly 2 is arranged on the support frame 1; the hose saddle 3 is arranged on the translation assembly 2 and is height-adjustable, and the hose saddle 3 is used to install and protect the test hose 6; the connecting plate 4 is arranged on the translation assembly 2 and is spaced apart from the hose saddle 3, and the connecting plate 4 is connected to the hose saddle 3 through a connecting rod 41; the driving mechanism 5 is connected to the hose saddle 3 and / or the connecting plate 4, and the driving mechanism 5 is used to drive the hose saddle 3 and the connecting plate 4 to reciprocate in the length direction of the translation assembly 2.

[0052] In this embodiment, in actual ship-to-ship working conditions, the hose is connected between two ships and freely suspended in the middle of the rear portion of the hose saddle. Due to the dynamic uncertainty of the movement between the two ships, the suspended hose is subjected to pressure bending fatigue loads. This device can perform highly reduced testing to simulate the actual fatigue conditions of the hose. It can be flexibly adjusted and is suitable for testing hoses of different calibers.

[0053] In one embodiment, the reference Figure 1 , the support frame 1 serves as the supporting structure of the device and can be welded with steel components. It includes a main frame 11, a foundation frame 12, a plurality of wheels 13 and a plurality of second adjustment mechanisms 14. The foundation frame 12 is fixed to the ground. In some scenarios, the foundation frame 12 may not be provided, and the main frame 11 may be directly fixed to the hard ground. The wheels 13 are installed on the bottom of the main frame 11 through the second adjustment mechanism 14. The overall movement of the device can be achieved through the wheels 13, and the height of the support frame 1 can be adjusted through the second adjustment mechanism 14. When the main frame 11 is moved to the preset position, the main frame 11 can be fixedly connected to the foundation frame 12 through a fixing member, and of course it can also be directly fixed on the hard ground.

[0054] Specifically, the second adjustment mechanism 14 includes a second hand wheel, a second screw and a second nut. The second hand wheel is fixed to the end of the second screw. The second screw is adaptively connected to the second nut. The end of the second screw away from the second hand wheel is connected to the wheel 13. The second nut is fixed on the main bracket 11. Rotating the second hand wheel can drive the main bracket 11 to move up and down.

[0055] It should be pointed out that the specific structure of the second adjustment mechanism 14 is explained in accordance with the specification. In actual use, other structures or devices can be selected according to actual needs, as long as the height adjustment of the main bracket 11 can be achieved. This is only for better explanation of the present invention and should not constitute a limitation to the present invention.

[0056] In one embodiment, the reference Figure 1The translation assembly 2 includes a guide rail 21 and a first slider 22 and a second slider 23 adapted to be arranged on the guide rail 21. The guide rail 21 is fixed to the top of the support frame 1, and a plurality of guide rails 21 can be provided. A plurality of first sliders 22 and second sliders 23 can be provided. The hose saddle 3 is arranged on the first slider 22, and the connecting plate 4 is arranged on the second slider 23, so that the hose saddle 3 and the connecting plate 4 can move in the length direction of the guide rail 21. The hose saddle 3 and the connecting plate 4 are connected by a connecting rod 41, and the connecting rod 41 is a retractable structure, so that the distance between the hose saddle 3 and the connecting plate 4 is adjustable. Of course, the translation assembly 2 can also be other structures, such as a crawler structure, a screw nut structure, etc., as long as the structure or device can realize the movement of the hose saddle 3 and the connecting plate 4 along the length direction of the support frame 1.

[0057] Reference Manual Figure 2 The hose saddle 3 includes a saddle body 31 and a saddle bracket 32; the saddle bracket 32 ​​includes a fixed bracket 321, a support plate 322 and a coat bracket 323. The saddle body 31 is connected to the fixed bracket 321. The fixed bracket 321 is arranged on the coat bracket 323 and can move up and down along the coat bracket 323. The coat bracket 323 is fixedly or detachably connected to the support plate 322. The support plate 322 is fixedly or detachably connected to the first slider 22. The saddle body 31 includes an arc-shaped bottom plate 311 and two side plates 312. The two side plates 213 are fixed parallel to both sides of the arc-shaped bottom plate 311. The fixed bracket 321 is fixedly connected to the arc-shaped bottom plate 311. As a protective device for the test hose 6, the saddle body 31 can protect the test hose 6 from maintaining a certain bending curvature during the process from horizontal to drooping to avoid stress concentration.

[0058] Furthermore, the saddle bracket 32 ​​also includes a first adjustment mechanism 324, which includes a first handwheel, a first screw and a first nut. The first handwheel is fixed to the end of the first screw, and the first screw is adaptively connected to the first nut. The end of the first screw away from the first handwheel is connected to the saddle body 31 or the fixed bracket 321, and the first nut is connected to the outer coat bracket 323 or the support plate 322. Rotating the first handwheel can drive the fixed bracket 321 to move up and down along the outer coat bracket 323.

[0059] It should be pointed out that the specific structure of the hose saddle 3 is described in accordance with the specification. In actual use, other structures or devices can be selected according to actual needs as long as the above functions can be achieved. This is only for the purpose of better illustrating the present invention and should not constitute a limitation to the present invention.

[0060] In one embodiment, the reference Figure 1The driving mechanism 5 includes a motor 51, a reduction gear 52, a rotating shaft 53, a rotating arm 54, a transmission pin 55 and a transmission connecting rod 56. The motor 51 is installed on the support frame 1. The driving shaft of the motor 51 is connected to the rotating shaft 53 through the reduction gear 52. The rotating shaft 53 is connected to the rotating arm 54. The rotating arm 54 is connected to the transmission connecting rod 56 through the transmission pin 55. The length of the transmission connecting rod 56 is adjustable. The end of the transmission connecting rod 56 away from the transmission pin 55 is connected to the connecting plate 4, so that the motor 51 can drive the connecting plate 4 to reciprocate through the transmission connecting rod 56.

[0061] It should be pointed out that the specific structure of the driving mechanism 5 is explained in accordance with the specification. In actual use, other structures or devices can be selected according to actual needs, such as electric push rods, cylinder mechanisms, oil cylinder structures, etc., as long as they can drive the connecting plate 4 to move back and forth. This is only for the purpose of better explaining the present invention and should not constitute a limitation to the present invention.

[0062] Further, see the attached manual Figure 4 The hose bending fatigue testing device also includes a test hose 6, which is adapted to be mounted on the hose saddle 3. The end of the test hose 6 is sealed to the hose connector on the connecting plate 4. The test hose 6 is provided with a filling port 61, a pressure sensor 62, a temperature sensor 63, and a drain valve 64. The filling port 61 is used to add a medium to the test hose 6, the pressure sensor 62 is used to monitor the pressure within the test hose 6, the temperature sensor 63 is used to monitor the temperature within the test hose 6, and the drain valve 64 is used to discharge excess pressure from the test hose 6.

[0063] In this embodiment, the test hose 6 can be subjected to a height reduction test, the hose saddle 3 can be adjusted in height and horizontal position to accommodate test samples of different calibers and lengths, and the main frame 11 is provided with wheels 13, which can be adjusted in position to accommodate test samples of different lengths; this device adopts mechanical connection, and related equipment can be disassembled and replaced, and the assembly operation is simple, which greatly saves operation time.

[0064] According to another aspect of the present invention, Figure 3 、 Figure 4 The present invention further provides a hose bending fatigue testing system, comprising: two sets of hose bending fatigue testing devices as described in any one of the above items, arranged opposite to each other, each end of the two support frames 1 close to each other is provided with a fixing plate 111, and the two fixing plates 111 are connected together by a connecting block 112; one end of the test hose 6 is sealed connected to the connecting plate 4 of one hose bending fatigue testing device, and the other end is sealed connected to the connecting plate 4 of the other hose bending fatigue testing device.

[0065] According to another aspect of the present invention, Figures 1 to 4The present invention further provides a hose bending fatigue testing method, which uses the hose bending fatigue testing system as described above to test the hose, including the following steps:

[0066] Step 1: Seal and connect the two ends of the test hose 6 to the corresponding hose interfaces on the connecting plate 4;

[0067] Step 2: Adjust the horizontal distance of the hose saddle 3 to a suitable position through the connecting rod 41, and adjust the height position of the hose saddle 3 through the first adjusting mechanism 324 to keep the test hose 6 level between the connecting plate 4 and the hose saddle 3;

[0068] Step 3: Adjust the position of the main support 11 by the second adjustment mechanism 14 according to the length of the test hose, keep the curvature of the midpoint of the hanging portion of the test hose to meet the test requirements, and then fix the main support 11 to the foundation support 12;

[0069] Step 4: Fill the test hose 6 with liquid nitrogen through the filling port 61 to the test pressure, monitor the temperature and pressure of the medium in the test hose 6 through the pressure sensor 62 and the temperature sensor 63, and discharge the excess pressure through the drain valve 64;

[0070] Step 5: Start the motor 51 and the reduction gear box 52, transmit power and change the direction of power through the rotating shaft 53, the rotating arm 54, the transmission pin 55, and the transmission connecting rod 56, and then drive the hose saddle 3 and the connecting plate 4 to reciprocate along the length direction of the guide rail 21;

[0071] Step 6: During the test, when the bending reaches a certain number of times, the corresponding test data is recorded. The test data includes at least one of the tube body pressure, the tube body temperature at different positions (such as the head, middle and tail positions of the tube body), the temperature of the drive mechanism, and the ambient temperature.

[0072] Furthermore, according to the test arrangement, in step four, the pressure of liquid nitrogen is adjusted in the test hose 6. At the same time, in step three, the position of the main support 11 is adjusted accordingly through the second adjustment mechanism 14 to meet the new bending curvature requirement, and the above test is repeated.

[0073] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0074] It should be noted that the above embodiments can be freely combined as needed. The above are only optional implementations of the present invention. It should be pointed out that those skilled in the art can make several improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A hose bending fatigue testing device, characterized in that: include: Support frame; A translation assembly is provided on the support frame; a hose saddle, disposed on the translation assembly and having an adjustable height, the hose saddle being used to mount and protect the test hose; a connecting plate, provided on the translation assembly and spaced apart from the hose saddle, the connecting plate and the hose saddle being connected via a connecting rod; A driving mechanism is connected to the hose saddle and / or the connecting plate, and is used to drive the hose saddle and the connecting plate to move back and forth in the length direction of the translation assembly.

2. The hose bending fatigue testing device according to claim 1, characterized in that: The translation assembly includes a guide rail and a first slider and a second slider adapted to be arranged on the guide rail. The guide rail is fixed on the support frame, the hose saddle is arranged on the first slider, and the connecting plate is arranged on the second slider, so that the hose saddle and the connecting plate can move in the length direction of the guide rail.

3. The hose bending fatigue testing device according to claim 2, characterized in that: The hose saddle includes a saddle body and a saddle bracket; The saddle bracket includes a fixed bracket, a support plate and a coat bracket. The saddle body is connected to the fixed bracket. The fixed bracket is arranged on the coat bracket and can move up and down along the coat bracket. The coat bracket is fixedly or detachably connected to the support plate. The support plate is fixedly or detachably connected to the first slider.

4. The hose bending fatigue testing device according to claim 3, characterized in that: The saddle body includes an arc-shaped bottom plate and two side plates, the two side plates are fixed parallel to both sides of the arc-shaped bottom plate, and the fixing bracket is fixedly connected to the arc-shaped bottom plate; The saddle bracket also includes a first adjustment mechanism, which includes a first handwheel, a first screw and a first nut. The first handwheel is fixed to the end of the first screw, and the first screw is adaptively connected to the first nut. The end of the first screw away from the first handwheel is connected to the saddle body or the fixed bracket, and the first nut is connected to the coat bracket or the support plate. Rotating the first handwheel can drive the fixed bracket to move up and down along the coat bracket.

5. The hose bending fatigue testing device according to claim 1, characterized in that: The driving mechanism includes a motor, a reduction gearbox, a rotating shaft, a rotating arm, a transmission pin and a transmission connecting rod. The motor is mounted on the support frame. The driving shaft of the motor is connected to the rotating shaft through the reduction gearbox. The rotating shaft is connected to the rotating arm. The rotating arm is connected to the transmission connecting rod through the transmission pin. The end of the transmission connecting rod away from the transmission pin is connected to the connecting plate, so that the motor can drive the connecting plate to reciprocate through the transmission connecting rod. Wherein, the length of the transmission connecting rod is adjustable, and the length of the connecting rod is adjustable.

6. The hose bending fatigue testing device according to claim 1, characterized in that: The support frame includes a main frame, a foundation frame, a plurality of wheels and a plurality of second adjustment mechanisms, the foundation frame is fixed to the ground, and the wheels are installed on the bottom of the main frame through the second adjustment mechanism; The second adjustment mechanism includes a second hand wheel, a second screw and a second nut. The second hand wheel is fixed to the end of the second screw. The second screw is adaptively connected to the second nut. The end of the second screw away from the second hand wheel is connected to the wheel. The second nut is fixed to the main frame. Rotating the second hand wheel can drive the main frame to move up and down. When the main body support is moved to a preset position, the main body support can be fixedly connected to the foundation support through a fixing piece.

7. The hose bending fatigue testing device according to any one of claims 1 to 6, characterized in that: Also includes: A test hose, wherein the test hose is adapted to be arranged on the hose saddle, and an end of the test hose is sealedly connected to the hose connector on the connecting plate; The test hose is provided with a filling port, a pressure sensor, a temperature sensor and a drain valve. The filling port is used to add medium to the test hose, the pressure sensor is used to monitor the pressure in the test hose, the temperature sensor is used to monitor the temperature in the test hose, and the drain valve is used to discharge overpressure from the test hose.

8. A hose bending fatigue testing system, characterized in that: include: Two sets of hose bending fatigue testing devices according to any one of claims 1 to 7 are arranged opposite to each other, wherein the two support frames are provided with fixing plates at their ends close to each other, and the two fixing plates are connected together by a connecting block; One end of the test hose is sealed and connected to a connection plate of the hose bending fatigue testing device, and the other end is sealed and connected to a connection plate of another hose bending fatigue testing device.

9. A hose bending fatigue testing method, characterized in that: The hose bending fatigue testing system as claimed in claim 8 is used to test the hose, comprising the steps of: Step 1: Seal and connect the two ends of the test hose to the corresponding connecting plates respectively; Step 2: Adjust the horizontal position and height of the hose saddle to the preset position to keep the test hose level between the connecting plate and the hose saddle; Step 3: Adjust the position of the support frame according to the length of the test hose to ensure that the curvature of the midpoint of the hanging part of the test hose meets the test requirements; Step 4: Fill the test hose with liquid nitrogen to the test pressure; Step 5: Start the driving mechanism to drive the hose saddle and the connecting plate to move back and forth in the length direction of the translation assembly; Step six: After bending a preset number of times, record the test data, wherein the test data includes at least one of the tube body pressure, the tube body temperature at different positions, the temperature of the driving mechanism, and the ambient temperature.

10. The hose bending fatigue testing method according to claim 9, characterized in that: Also includes the steps: Adjust the test pressure in step 4 and adjust the support frame position in step 3 to meet the new bending curvature requirements, and repeat the above test.

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