Umbilical cable bending stiffness testing device and method

Abstract

The present invention relates to an umbilical cable bending stiffness testing device and method. The device comprises a workbench; a measuring groove is formed in the top of the workbench; a fixing assembly is arranged in the measuring groove, and the fixing assembly is used for fixing two ends of an umbilical cable; a mounting plate is fixedly connected to the bottom of the workbench; a mounting frame is fixedly connected to the upper surface of the mounting plate; a threaded rod is rotatably connected between the lower surface of the mounting frame and the upper surface of the mounting plate; obtained data is transmitted to a dynamic data acquisition system by means of a displacement monitor body; the dynamic data acquisition system calculates obtained parameters to obtain bending stiffness curves of the umbilical cable under different curvatures. Moreover, because the device is in rigid connection with the umbilical cable by means of two sets of hoops, the problem of stress concentration caused by flexible connection of a steel strand rope is avoided, and the rigid connection ensures that tensile loads can be applied to two points of the umbilical cable in a balanced manner during an experiment, thereby improving the accuracy of bending stiffness testing results.

Description

Umbilical cable bending stiffness testing device and testing method Technical Field

[0001] The present invention relates to the technical field of umbilical cable testing, and in particular to an umbilical cable bending stiffness testing device and a testing method. Background Art

[0002] At present, my country's offshore oil and gas development is gradually moving towards deep water. The role of umbilical cables in underwater production systems is particularly critical. The research on their full-scale testing technology is relatively difficult. Among them, bending stiffness is a key parameter to measure the bending performance of umbilical cables, and it has important reference value for the installation, laying and operation of umbilical cables.

[0003] The current umbilical cable bending stiffness test method is based on the test scheme of flexible pipes, usually three-point bending and four-point bending test methods. Generally, the umbilical cable is flexibly connected to the steel strands, and then the steel strands are pulled to bend the umbilical cable. Then the bending performance of the umbilical cable can be calculated.

[0004] In the prior art, steel strands are usually used to flexibly connect umbilical cables. In this case, stress may be concentrated at the connection location, which has a significant impact on the bending moment calculation results, resulting in large errors in the umbilical cable bending stiffness test results.

[0005] Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that stress concentration generated during bending stiffness testing causes excessive influence on the bending moment calculation results.

[0007] In order to solve the above technical problems, the present invention provides an umbilical cable bending stiffness testing device and testing method, comprising a workbench, a measuring slot is provided on the top of the workbench, a fixing assembly is provided in the measuring slot, and the fixing assembly is used to fix the two ends of the umbilical cable, a mounting plate is fixedly connected to the bottom of the workbench, a mounting bracket is fixedly connected to the upper surface of the mounting plate, a threaded rod is rotatably connected between the lower surface of the mounting bracket and the upper surface of the mounting plate, and a connecting block is threadedly connected to the outer wall of the threaded rod. The top of the mounting frame is fixedly connected to a mounting block, and the outer walls of the mounting block close to both ends of the measuring slot are hinged with a second connecting rod, and the outer walls of the connecting block close to both ends of the measuring slot are fixedly connected to a first connecting rod, and the end of the first connecting rod away from the connecting block is hingedly connected to the end of the second connecting rod away from the mounting block, and the tops of the two groups of second connecting rods are hinged with mounting seats, and the top of each of the mounting seats is fixedly connected to a tension rod, and the top of each of the tension rods is clamped with a clamp, and a test assembly is provided on the top of the workbench, and the test assembly is used to monitor the moving distance of the umbilical cable, and the bottom of the mounting plate is fixedly connected to a first drive motor, and the output shaft of the first drive motor is fixedly connected to the end of the threaded rod.

[0008] In one embodiment of the present invention, the hoop is composed of two groups of hoop plates, both ends of the two groups of hoop plates are fixedly connected with wing plates, the outer wall of each wing plate is provided with a thread groove, and the first bolts are threadedly connected in the two adjacent groups of thread grooves, and the two groups of hoop plates are connected by two groups of first bolts.

[0009] In one embodiment of the present invention, two groups of limit rods are fixedly connected between the mounting frame and the mounting plate, and the two groups of limit rods are respectively located on both sides of the connecting block. Two groups of through holes adapted to the limit rods are opened on the top of the connecting block, and the two groups of limit rods are respectively arranged in the two groups of through holes.

[0010] In one embodiment of the present invention, the fixing assembly includes a movable groove opened in the workbench and located in the measuring groove, a bidirectional screw rod is rotatably connected in the movable groove, and both ends of the bidirectional screw rod are threadedly connected to a movable block, each of the movable blocks is fixedly connected to a connecting column on the outer wall of the side close to the measuring groove, and each of the connecting columns is fixedly connected to a first fixing ring on one end away from the connecting block, and each of the first fixing rings is fixedly connected to a first spring on the outer wall of the side away from the connecting column, and the first spring is fixedly connected to a second fixing ring on one end away from the first fixing ring, and threaded holes are opened at both ends of the first fixing ring and the second fixing ring, and second bolts are threadedly connected in two adjacent groups of threaded holes, and the first fixing ring and the second fixing ring are fixedly connected via two groups of second bolts, and the outer wall of the workbench is fixedly connected to a second drive motor, and the output group of the second drive motor is fixedly connected to the end of the bidirectional screw rod.

[0011] In one embodiment of the present invention, two groups of first limit grooves are provided in the workbench and in the movable groove. The two groups of first limit grooves are symmetrically arranged relative to the movable block. Each outer wall of the movable block is fixedly connected to a first limit block. The first limit block and the first limit groove are symmetrically arranged. The first limit block is slidably installed in the first limit groove.

[0012] In one embodiment of the present invention, the test assembly includes an L-shaped bracket fixedly connected to the top of the workbench and located on one side of the measuring slot, the L-shaped bracket consists of a horizontal plate and a vertical plate, a slide groove is provided on the top of the horizontal plate of the L-shaped bracket, four groups of sliders are slidably installed in the slide groove, each of the sliders is fixedly connected to a cylinder at the bottom, each of the telescopic rods of the cylinder is fixedly connected to a displacement monitor body at the bottom, each output rod end of the displacement monitor body is fixedly connected to a measuring block, the bottom of the measuring block is arc-shaped, and the displacement monitor body is electrically connected to the dynamic data acquisition system.

[0013] In one embodiment of the present invention, two groups of second limiting grooves are provided in the L-shaped bracket and in the slide groove, and the outer walls on both sides of each slider close to the second limiting groove are fixedly connected with second limiting blocks, and the second limiting blocks are slidably installed in the second limiting groove.

[0014] In one embodiment of the present invention, a circular groove is provided on the top of each slider, an electric telescopic rod is fixedly connected to the bottom of each circular groove, a connecting plate is fixedly connected to the top of each electric telescopic rod, and a pressure block is fixedly connected to the bottom of each connecting plate away from the electric telescopic rod.

[0015] A method for testing the bending stiffness of an umbilical cable, comprising the following steps:

[0016] S1: First, take out the umbilical cable, fix the two ends of the umbilical cable by using two sets of first fixing rings and second fixing rings, and rigidly connect the middle part of the umbilical cable by using two sets of clamps;

[0017] S2: Slide the displacement monitor body to both sides of the two sets of clamps, then drive the measuring block to contact the upper surface of the umbilical cable through the cylinder, and then reset the displacement monitor body;

[0018] S3: Control the second connecting rod of the first driving motor to move downward, and perform a bending operation test on the umbilical cable.

[0019] In one embodiment of the present invention, in S2, after the displacement monitor body slides to both sides of the two sets of clamps, the electric telescopic rod is controlled to retract, driving the connecting plate and the pressure plate to move downward.

[0020] The above technical solution of the present invention has the following advantages over the prior art:

[0021] The umbilical cable bending stiffness testing device and method described in the present invention transmit the obtained data to a dynamic data acquisition system through a displacement monitor body. The dynamic data acquisition system calculates the obtained parameters to obtain the bending stiffness curves of the umbilical cable under different curvatures. In addition, because the device rigidly connects the umbilical cable through two sets of clamps, the stress concentration problem caused by the flexible connection of the steel strands is avoided. The rigid connection ensures that a tensile load can be applied to the umbilical cable at two points in a balanced manner during the experiment, thereby improving the accuracy of the bending stiffness test results.

[0022] The umbilical cable bending stiffness testing equipment and testing method described in the present invention use a moving block to move the two ends of the umbilical cable away from each other, so that the umbilical cable gradually becomes taut, avoiding the umbilical cable being in a loose state, resulting in the displacement distance of the umbilical cable being too large compared with the actual situation when it is subsequently pulled, resulting in errors in the calculation results, affecting the accuracy of the umbilical cable bending stiffness test. Subsequently, the staff rotates the first bolt. During the rotation process, the first bolt causes the two sets of hoops to approach each other and gradually contact the outer surface of the umbilical cable, thereby achieving a rigid connection of the umbilical cable, avoiding stress concentration during the test process when the umbilical cable is flexibly connected using a steel rope, which affects the bending moment calculation results. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] FIG1 is a perspective view of the present invention;

[0025] FIG2 is a schematic structural diagram of the mounting frame of the present invention;

[0026] Figure 3 is an enlarged view of point A in Figure 2;

[0027] FIG4 is a cross-sectional view of the workbench of the present invention;

[0028] Figure 5 is an enlarged view of point B in Figure 4;

[0029] FIG6 is a schematic structural diagram of the first fixing ring and the second fixing ring in the present invention;

[0030] FIG7 is a cross-sectional view of the workbench of the present invention;

[0031] FIG8 is an enlarged view of point C in FIG7 .

[0032] Description of the accompanying drawings: 1. Workbench; 2. Mounting plate; 21. Measuring slot; 3. Mounting frame; 31. Mounting block; 32. First connecting rod; 33. Threaded rod; 34. Second connecting rod; 35. Connecting block; 36. Limiting rod; 37. First driving motor; 4. Mounting seat; 41. Tension rod; 42. Hoop; 43. First bolt; 5. Moving block; 51. Connecting column; 52. First fixing ring; 53. Second fixing ring; 54 , threaded hole; 55, second bolt; 56, first spring; 57, first limit groove; 58, first limit block; 6, L-shaped bracket; 61, slide groove; 62, second limit groove; 63, second limit block; 64, cylinder; 65, displacement monitor body; 66, measuring block; 7, slider; 71, circular groove; 72, electric telescopic rod; 73, connecting plate; 74, pressure block; 8, movable groove; 81, bidirectional screw rod; 82, second drive motor. DETAILED DESCRIPTION

[0033] 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.

[0034] 1 to 8 , an umbilical cable bending stiffness testing device and testing method of the present invention include a workbench 1, a measuring slot 21 is provided on the top of the workbench 1, a fixing assembly is provided in the measuring slot 21, and the fixing assembly is used to fix the two ends of the umbilical cable, and the bottom of the workbench 1 is fixedly connected to a mounting plate 2, and the upper surface of the mounting plate 2 is fixedly connected to a mounting bracket 3, and a threaded rod 33 is rotatably connected between the lower surface of the mounting bracket 3 and the upper surface of the mounting plate 2, and the outer wall of the threaded rod 33 is threadedly connected to a connecting block 35, and the top of the mounting bracket 3 is fixedly connected to a mounting block 31, and the outer walls of the mounting block 31 near the two ends of the measuring slot 21 are hinged with a second connecting rod 3 4. The outer walls of the connecting block 35 near both ends of the measuring slot 21 are fixedly connected to the first connecting rod 32. The end of the first connecting rod 32 away from the connecting block 35 is hingedly connected to the end of the second connecting rod 34 away from the mounting block 31. The tops of the two groups of second connecting rods 34 are hingedly connected to the mounting seats 4. The top of each mounting seat 4 is fixedly connected to a tension rod 41. The top of each tension rod 41 is clamped with a clamp 42. A test assembly is provided on the top of the workbench 1. The test assembly is used to monitor the moving distance of the umbilical cable. The bottom of the mounting plate 2 is fixedly connected to a first drive motor 37. The output shaft of the first drive motor 37 is fixedly connected to the end of the threaded rod 33.

[0035] In order to avoid stress concentration when testing the umbilical cable through a flexible connection, when performing a bending stiffness test on the umbilical cable, the staff first needs to turn it through the two sets of clamps 42, and then fix the two ends of the umbilical cable through the fixing assembly. When the two ends of the umbilical cable are fixed, the staff fixes the two sets of clamps 42 to the umbilical cable to complete the rigid connection of the umbilical cable. At this time, the umbilical cable is fixedly connected to the two sets of tension rods 41 under the action of the two sets of clamps 42. Then the staff turns on the first drive motor 37. The output shaft of the first drive motor 37 will drive the threaded rod 33 to rotate. The rotating threaded rod 33 will drive the connecting block 35 to move downward through the threaded transmission. Since the connecting block 35 and the first connecting rod 32 are fixedly connected, the connecting block 35 moves downward. During the downward rotation of the second connecting rod 34, the mounting base 4 hinged on the top thereof will be driven to move downward synchronously, thereby driving the tension rod 41 to pull the umbilical cable downward. At this time, the test component will monitor the downward movement distance of the umbilical cable at different positions, and transmit the obtained parameters to the dynamic data acquisition system for calculation, so as to obtain the bending stiffness curve of the umbilical cable under different curvatures. In addition, since the present device rigidly connects the umbilical cable through two sets of clamps 42, the stress concentration problem caused by the flexible connection of the steel rope is avoided. The rigid connection ensures that the tensile load can be applied to the two points of the umbilical cable in a balanced manner during the experiment, thereby improving the accuracy of the bending stiffness test results.

[0036] In one embodiment of the present invention, the hoop 42 is composed of two groups of hoop plates, both ends of the two groups of hoop plates are fixedly connected with wing plates, the outer wall of each wing plate is provided with a threaded groove, and the first bolts 43 are threadedly connected in the two adjacent groups of threaded grooves. The two groups of hoop plates are connected by the two groups of first bolts 43. When the umbilical cable is installed, the first bolts 43 are first rotated to increase the distance between the two groups of hoop plates, and then the umbilical cable is passed through the two groups of hoop plates, and the two ends of the umbilical cable are fixed by the fixing assembly. When the two ends of the umbilical cable are fixed, the staff rotates the first bolt 43 again. During the rotation process, the first bolt 43 will bring the two groups of hoop plates closer to each other and gradually contact the outer surface of the umbilical cable, thereby realizing a rigid connection of the umbilical cable and avoiding stress concentration during the test when the umbilical cable is flexibly connected using a steel rope, which affects the bending moment calculation results.

[0037] In one embodiment of the present invention, two groups of limit rods 36 are fixedly connected between the mounting frame 3 and the mounting plate 2. The two groups of limit rods 36 are respectively located on both sides of the connecting block 35. Two groups of through holes compatible with the limit rods 36 are opened on the top of the connecting block 35. The two groups of limit rods 36 are respectively arranged in the two groups of through holes. After the staff turns on the first drive motor 37, the output shaft of the first drive motor 37 will drive the threaded rod 33 to rotate. Since the two groups of limit rods 36 are respectively arranged in the two groups of through holes at this time, the limit rods 36 can play a limiting role on the connecting block 35, avoiding the situation where the threaded rod 33 is driven to rotate together due to the large friction between the threaded rod 33 and the connecting block 35 during the rotation process, thereby ensuring that the connecting block 35 can move up and down stably during the rotation of the threaded rod 33, thereby ensuring the normal implementation of the umbilical cable bending test.

[0038] In one embodiment of the present invention, the fixing assembly includes a moving groove 8 opened in the workbench 1 and located in the measuring groove 21, a bidirectional screw rod 81 is rotatably connected in the moving groove 8, and both ends of the bidirectional screw rod 81 are threadedly connected to a moving block 5, and each of the moving blocks 5 is fixedly connected to a connecting column 51 on the outer wall of the side close to the measuring groove 21, and each of the connecting columns 51 is fixedly connected to a first fixing ring 52 on one end away from the connecting block 35, and each of the first fixing ring 52 is fixedly connected to a first spring 56 on the outer wall of the side away from the connecting column 51, and the first spring 56 is fixedly connected to a second fixing ring 53 on one end away from the first fixing ring 52, and threaded holes 54 are opened at both ends of the first fixing ring 52 and the second fixing ring 53, and second bolts 55 are threadedly connected in two adjacent groups of threaded holes 54, and the first fixing ring 52 and the second fixing ring 53 are fixedly connected by two groups of second bolts 55, and a second drive motor 82 is fixedly connected to the outer wall of the workbench 1, and the output group of the second drive motor 82 is fixedly connected to the end of the bidirectional screw rod 81;

[0039] When installing the umbilical cable, first remove the second bolt 55, then stretch the second fixing ring 53 on one side of the measuring slot 21 to the side away from the first fixing ring 52, and stretch the first spring 56, then the staff passes one end of the umbilical cable through the first fixing ring 52 and the second fixing ring 53, and then the staff loosens the second fixing ring 53. At this time, the second fixing ring 53 is reset to the side of the first fixing ring 52 under the action of the elastic restoring force of the first spring 56 itself, and fits with the umbilical cable. With the cooperation of the first fixing ring 52 and the second fixing ring 53, the umbilical cable can be pre-fixed, and then the staff continues to convey the umbilical cord to pass through the two sets of clamps 42. After the end of the umbilical cable passes between the second set of first fixing rings 52 and the second fixing rings 53, the staff removes the second bolt 55 and connects the first fixing ring 52 and the second fixing ring 53 through the multiple sets of threaded holes 54. As the second bolt 55 rotates, it drives the first fixing ring 52 and the second fixing ring 53 closer to each other, thereby achieving fixation of both ends of the umbilical cable;

[0040] When both ends of the umbilical cable are fixed, the second drive motor 82 is turned on, and the output shaft of the second drive motor 82 drives the bidirectional screw 81 to rotate. The rotating bidirectional screw 81 can drive the two sets of moving blocks 5 to move synchronously through thread transmission, and because the thread directions of the two ends of the bidirectional screw 81 are opposite, the bidirectional screw 81 can drive the two sets of moving blocks 5 to move synchronously toward the two ends of the moving groove 8 when rotating, thereby driving the two ends of the umbilical cable away from each other, so that the umbilical cable gradually becomes taut, avoiding the umbilical cable being in a loose state, resulting in the displacement distance of the umbilical cable being too different from the actual situation when it is pulled later, resulting in errors in the calculation results, affecting the accuracy of the umbilical cable bending stiffness test.

[0041] In one embodiment of the present invention, two groups of first limiting grooves 57 are provided in the workbench 1 and in the moving groove 8. The two groups of first limiting grooves 57 are symmetrically arranged relative to the moving block 5. A first limiting block 58 is fixedly connected to the outer wall of each moving block 5. The first limiting block 58 is symmetrically arranged with the first limiting groove 57 and is slidably installed in the first limiting groove 57.

[0042] During the movement of the moving block 5, it will drive the first limit block 58 to move in the first limit groove 57. The first limit block 58 can limit the moving block 5 to avoid the situation where the two-way screw 81 rotates and drives the moving block 5 to rotate synchronously under the action of the friction between the moving block 5 and the two-way screw 81, resulting in the inability to bring the umbilical cable into a taut state, thereby affecting the accuracy of subsequent test results.

[0043] In one embodiment of the present invention, the test assembly includes an L-shaped bracket 6 fixedly connected to the top of the workbench 1 and fixedly connected to one side of the measuring slot 21. The L-shaped bracket 6 is composed of a horizontal plate and a vertical plate. A slide groove 61 is provided on the top of the horizontal plate of the L-shaped bracket 6. Four groups of sliders 7 are slidably installed in the slide groove 61. The bottom of each slider 7 is fixedly connected to a cylinder 64. The bottom of the telescopic rod of each cylinder 64 is fixedly connected to a displacement monitor body 65. The output rod end of each displacement monitor body 65 is fixedly connected to a measuring block 66. The bottom of the measuring block 66 is arc-shaped. The displacement monitor body 65 is electrically connected to the dynamic data acquisition system.

[0044] After the umbilical cable is fixed, the staff needs to slide the slider 7 to move the displacement monitor body 65, so that the four groups of displacement monitor bodies 65 are moved to the two sides of the two groups of clamps 42 respectively, and then start the cylinder 64 to push the displacement monitor body 65 downward, so that the bottom of the measuring block 66 contacts the outer surface of the umbilical cable, and then continue to push the displacement monitor body 65 downward. Since the measuring block 66 contacts the outer surface of the umbilical cable at this time, the output rod driven by the displacement monitor body 65 enters the displacement detector body during the downward movement, and then the value of the displacement monitor body 65 is cleared. After that, the first drive motor 37 can be turned on to drive the tension rod 41 to pull the umbilical cable downward. At this time, the output rod of the displacement monitor body 65 will move synchronously. When the umbilical cable cannot be pulled and bent, the output rod will no longer move. At this time, the displacement monitor body 65 will transmit the obtained data to the dynamic data acquisition system. The dynamic data acquisition system will calculate the obtained parameters to obtain the bending stiffness curve of the umbilical cable under different curvatures, which is convenient and fast.

[0045] In one embodiment of the present invention, two groups of second limiting grooves 62 are provided in the L-shaped bracket 6 and in the slide groove 61. The outer walls on both sides of each slider 7 close to the second limiting groove 62 are fixedly connected with second limiting blocks 63. The second limiting blocks 63 are slidably installed in the second limiting groove 62. When the slider 7 moves, it will drive the second limiting blocks 63 to move in the second limiting groove 62. At this time, the second limiting blocks 63 can limit the slider 7 to ensure that the slider 7 will not tilt during the movement, thereby ensuring that the measuring block 66 has good contact with the umbilical cable and avoiding drift of the monitoring data.

[0046] In one embodiment of the present invention, a circular groove 71 is provided on the top of each slider 7, and an electric telescopic rod 72 is fixedly connected to the bottom of each circular groove 71. A connecting plate 73 is fixedly connected to the top of each electric telescopic rod 72, and a pressure block 74 is fixedly connected to the bottom of each connecting plate 73 at one end away from the electric telescopic rod 72. When the displacement monitor body 65 moves to a suitable position, the electric telescopic rod 72 is controlled to be retracted. At this time, the connecting plate 73 on the top of the electric telescopic rod 72 will move downward, thereby driving the pressure block 74 to contact the horizontal plate of the L-shaped bracket 6, thereby fixing the slider 7, avoiding the movement of the slider 7 due to external shaking when the umbilical cable is monitored for displacement, resulting in errors in the data obtained by the displacement monitor body 65, thereby improving the accuracy of the umbilical cable bending stiffness test results.

[0047] A method for testing the bending stiffness of an umbilical cable, comprising the following steps:

[0048] S1: First, the umbilical cable is taken out, and the two ends of the umbilical cable are fixed by the cooperation of the two sets of first fixing rings 52 and the second fixing rings 53, and the middle part of the umbilical cable is rigidly connected by two sets of clamps 42;

[0049] S2: Slide the displacement monitor body 65 to both sides of the two sets of clamps 42, then drive the measuring block 66 to contact the upper surface of the umbilical cable through the cylinder 64, and then reset the displacement monitor body 65;

[0050] S3: Control the first drive motor 37 to move the second connecting rod 34 downward, and perform a bending operation test on the umbilical cable.

[0051] In one embodiment of the present invention, in S2, after the displacement monitor body 65 slides to both sides of the two sets of clamps 42, the electric telescopic rod 72 is controlled to retract, driving the connecting plate 73 and the pressure plate to move downward.

[0052] Working principle: When installing the umbilical cable, first remove the second bolt 55 and rotate the first bolt 43 to increase the distance between the two sets of hoop plates. Then stretch the second fixing ring 53 on one side of the measuring slot 21 to the side away from the first fixing ring 52 and stretch the first spring 56. Then the staff will pass one end of the umbilical cable through the first fixing ring 52 and the second fixing ring 53. Then the staff will loosen the second fixing ring 53. At this time, the second fixing ring 53 will be reset to the side of the first fixing ring 52 under the action of the elastic restoring force of the first spring 56 itself and will be connected to the umbilical cable. The cable is fitted. With the cooperation of the first fixing ring 52 and the second fixing ring 53, the umbilical cable can be pre-fixed. Then the staff continues to convey the umbilical cord and pass it through the two sets of clamps 42. When the end of the umbilical cord passes between the second set of first fixing rings 52 and the second fixing ring 53, the staff removes the second bolt 55 and connects the first fixing ring 52 and the second fixing ring 53 through the multiple sets of threaded holes 54. As the second bolt 55 rotates, it will drive the first fixing ring 52 and the second fixing ring 53 closer to each other, thereby achieving the fixation of the two ends of the umbilical cord.

[0053] When both ends of the umbilical cable are fixed, the second drive motor 82 is turned on, and the output shaft of the second drive motor 82 drives the bidirectional screw rod 81 to rotate. The rotating bidirectional screw rod 81 can drive the two sets of moving blocks 5 to move synchronously through thread transmission, and because the thread directions of the two ends of the bidirectional screw rod 81 are opposite, the bidirectional screw rod 81 can drive the two sets of moving blocks 5 to move synchronously toward the two ends of the moving groove 8 when rotating, thereby driving the two ends of the umbilical cable away from each other, so that the umbilical cable gradually becomes taut, and avoids the umbilical cable being in a loose state, resulting in a large difference between the displacement distance and the actual situation when it is subsequently pulled, resulting in errors in the calculation results, affecting the accuracy of the umbilical cable bending stiffness test, and then the staff rotates the first bolt 43 again. During the rotation process, the first bolt 43 will make the two sets of hoops approach each other and gradually contact with the outer surface of the umbilical cable, thereby achieving a rigid connection of the umbilical cable, and avoiding stress concentration during the test when the umbilical cable is flexibly connected using a steel rope, which affects the bending moment calculation results;

[0054] When the umbilical cable is completely fixed, the staff moves the four sets of displacement monitor bodies 65 to the two sides of the two sets of clamps 42 respectively, and then controls the electric telescopic rod 72 to retract. At this time, the connecting plate 73 on the top of the electric telescopic rod 72 will move downward, thereby driving the pressure block 74 to contact the horizontal plate of the L-shaped bracket 6, which has the effect of fixing the slider 7. This prevents the slider 7 from moving due to external shaking when the umbilical cable is being monitored for displacement, resulting in errors in the data obtained by the displacement monitor body 65, thereby improving the accuracy of the umbilical cable bending stiffness test results;

[0055] Then, the cylinder 64 is turned on to push the displacement monitor body 65 downward, so that the bottom of the measuring block 66 contacts the outer surface of the umbilical cable, and then the displacement monitor body 65 is pushed downward. Since the measuring block 66 contacts the outer surface of the umbilical cable at this time, the output rod driven by the displacement monitor body 65 enters the displacement detector body during the downward movement. Then, the value of the displacement monitor body 65 is cleared, and then the first drive motor 37 can be turned on. The output shaft of the first drive motor 37 drives the threaded rod 33 to rotate, and the rotating threaded rod 33 drives the connecting block 35 to move downward through the threaded transmission. Since the connecting block 35 and the first connecting rod 32 are fixedly connected, the connecting block 35 will drive the first connecting rod 32 to move downward synchronously during the downward movement. At this time, the first connecting rod 32 The second connecting rod 34 hinged at the end will rotate downward. During the downward rotation, the second connecting rod 34 will drive the mounting base 4 hinged at its top to move downward synchronously, thereby driving the tension rod 41 to pull the umbilical cable downward. At this time, the output rod of the displacement monitor body 65 will move synchronously. When the umbilical cable cannot be pulled to bend, the output rod will no longer move. At this time, the displacement monitor body 65 will transmit the obtained data to the dynamic data acquisition system. The dynamic data acquisition system will calculate the obtained parameters to obtain the bending stiffness curve of the umbilical cable under different curvatures. In addition, since the device rigidly connects the umbilical cable through two sets of clamps 42, the stress concentration problem caused by the flexible connection of the steel rope is avoided. The rigid connection ensures that the tensile load can be applied to the two points of the umbilical cable in a balanced manner during the experiment, thereby improving the accuracy of the bending stiffness test results.

[0056] 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. An umbilical cable bending stiffness testing device, characterized in that: The invention comprises a workbench (1), wherein a measuring groove (21) is provided on the top of the workbench (1), wherein a fixing assembly is arranged in the measuring groove (21), wherein the fixing assembly is used to fix two ends of the umbilical cable, wherein a mounting plate (2) is fixedly connected to the bottom of the workbench (1), wherein a mounting frame (3) is fixedly connected to the upper surface of the mounting plate (2), wherein a threaded rod (33) is rotatably connected between the lower surface of the mounting frame (3) and the upper surface of the mounting plate (2), wherein a connecting block (35) is threadedly connected to the outer wall of the threaded rod (33), wherein a mounting block (31) is fixedly connected to the top of the mounting frame (3), wherein the outer walls of the mounting block (31) close to both ends of the measuring groove (21) are both hingedly connected to second connecting rods (34), wherein the connecting block (35) close to the measuring groove ( The outer walls at both ends of the workbench (1) are fixedly connected with a first connecting rod (32), one end of the first connecting rod (32) away from the connecting block (35) is hingedly connected to one end of the second connecting rod (34) away from the mounting block (31), the tops of the two groups of the second connecting rods (34) are hingedly connected with mounting seats (4), the top of each mounting seat (4) is fixedly connected with a tension rod (41), and the top of each tension rod (41) is clamped with a clamp (42), a test assembly is arranged on the top of the workbench (1), and the test assembly is used to monitor the moving distance of the umbilical cable, the bottom of the mounting plate (2) is fixedly connected with a first drive motor (37), and the output shaft of the first drive motor (37) is fixedly connected to the end of the threaded rod (33).

2. The umbilical cable bending stiffness testing device according to claim 1, characterized in that: The hoop (42) is composed of two groups of hoop plates, both ends of the two groups of hoop plates are fixedly connected with wing plates, the outer wall of each wing plate is provided with a thread groove, the first bolts (43) are threadedly connected in the two adjacent groups of thread grooves, and the two groups of hoop plates are connected by the two groups of first bolts (43).

3. The umbilical cable bending stiffness testing device according to claim 2, characterized in that: Two groups of limit rods (36) are fixedly connected between the mounting frame (3) and the mounting plate (2), and the two groups of limit rods (36) are respectively located on both sides of the connecting block (35). The top of the connecting block (35) is provided with two groups of through holes adapted to the limit rods (36), and the two groups of limit rods (36) are respectively arranged in the two groups of through holes.

4. The umbilical cable bending stiffness testing device according to claim 3, characterized in that: The fixing assembly comprises a moving groove (8) which is opened in the workbench (1) and located in the measuring groove (21); a bidirectional screw rod (81) is rotatably connected in the moving groove (8); both ends of the bidirectional screw rod (81) are threadedly connected to moving blocks (5); an outer wall of each moving block (5) on a side close to the measuring groove (21) is fixedly connected to a connecting column (51); an end of each connecting column (51) away from the connecting block (35) is fixedly connected to a first fixing ring (52); and both ends of the outer wall of each first fixing ring (52) on a side away from the connecting column (51) are fixedly connected to a first elastic member. Spring (56), one end of the first spring (56) away from the first fixing ring (52) is fixedly connected to the second fixing ring (53), both ends of the first fixing ring (52) and the second fixing ring (53) are provided with threaded holes (54), the inner threads of two adjacent groups of threaded holes (54) are connected with second bolts (55), the first fixing ring (52) and the second fixing ring (53) are fixedly connected via two groups of second bolts (55), the outer wall of the workbench (1) is fixedly connected to the second drive motor (82), and the output group of the second drive motor (82) is fixedly connected to the end of the bidirectional screw rod (81).

5. The umbilical cable bending stiffness testing device according to claim 4, characterized in that: Two groups of first limiting grooves (57) are provided in the workbench (1) and in the moving groove (8); the two groups of the first limiting grooves (57) are symmetrically arranged relative to the moving block (5); the outer wall of each moving block (5) is fixedly connected with a first limiting block (58); the first limiting block (58) and the first limiting groove (57) are symmetrically arranged; and the first limiting block (58) is slidably installed in the first limiting groove (57).

6. The umbilical cable bending stiffness testing device according to claim 5, characterized in that: The test assembly comprises an L-shaped bracket (6) fixedly connected to the top of the workbench (1) and located on one side of the measuring slot (21), the L-shaped bracket (6) being composed of a horizontal plate and a vertical plate, a slide slot (61) being provided on the top of the horizontal plate of the L-shaped bracket (6), four groups of slide blocks (7) being slidably installed in the slide slot (61), each of the slide blocks (7) being fixedly connected to a cylinder (64) at the bottom, each of the telescopic rods of the cylinder (64) being fixedly connected to a displacement monitor body (65), each of the output rod ends of the displacement monitor body (65) being fixedly connected to a measuring block (66), the bottom of the measuring block (66) being arc-shaped, and the displacement monitor body (65) being electrically connected to a dynamic data acquisition system.

7. The umbilical cable bending stiffness testing device according to claim 6, characterized in that: Two groups of second limiting grooves (62) are provided in the L-shaped bracket (6) and in the slide groove (61); the outer walls on both sides of each sliding block (7) close to the second limiting grooves (62) are fixedly connected with second limiting blocks (63); and the second limiting blocks (63) are slidably installed in the second limiting grooves (62).

8. The umbilical cable bending stiffness testing device according to claim 7, characterized in that: A circular groove (71) is formed on the top of each sliding block (7), an electric telescopic rod (72) is fixedly connected to the bottom of each circular groove (71), a connecting plate (73) is fixedly connected to the top of each electric telescopic rod (72), and a pressing block (74) is fixedly connected to the bottom of one end of each connecting plate (73) away from the electric telescopic rod (72).

9. A method for testing the bending stiffness of an umbilical cable, applicable to the umbilical cable bending stiffness testing device as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S1: First, the umbilical cable is taken out, and the two ends of the umbilical cable are fixed by the cooperation of two sets of first fixing rings (52) and second fixing rings (53), and the middle part of the umbilical cable is rigidly connected by two sets of clamps (42); S2: Slide the displacement monitor body (65) to the two sides of the two sets of clamps (42), then drive the measuring block (66) to contact the upper surface of the umbilical cable through the cylinder (64), and then reset the displacement monitor body (65); S3: Control the first drive motor (37) and the second connecting rod (34) to move downward, and perform a bending operation test on the umbilical cable.

10. The method for testing bending stiffness of an umbilical cable according to claim 9, characterized in that: In S2, after the displacement monitor body (65) slides to the two sides of the two sets of clamps (42), the electric telescopic rod (72) is controlled to retract, driving the connecting plate (73) and the pressure plate to move downward.

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