A test method and test device for rotational fatigue and impact deformation of slip rings in a single-pillar mooring system

Abstract

The present invention relates to the technical field of marine oil and gas development equipment, and in particular to a test method and test device for the rotational fatigue and impact deformation of a slip ring in a single-pillar mooring system. The test method comprises the following steps: fixedly connecting the turret to the test device, fixedly connecting the inner ring of the slip ring to the turret, fixing the outer ring clamp to the outer side wall of the outer ring, connecting the fixture of the test device to the outer ring clamp, and adjusting the excitation assembly to correspond to the turret via the lifting assembly; the driving assembly of the test device drives the outer ring to rotate around the inner ring, while controlling the excitation assembly and / or the clamp to apply a load to the turret and the slip ring to simulate actual working conditions, thereby obtaining the torque value output by the torque sensor of the clamp to analyze the performance of the slip ring. The present invention solves the technical problem of the difficulty in testing slip rings and turrets and improves the efficiency of detecting slip ring performance.

Description

Technical Field

[0001] The present invention relates to the technical field of marine oil and gas development equipment, and in particular to a test method and a test device for rotation fatigue and impact deformation of a slip ring of a single-column mooring system. Background Art

[0002] Offshore buoys often use a single-column mooring system during mooring operations. This mooring method has a "weather vane effect," meaning that under the influence of wind, wave and current loads, the buoy can rotate around the turret to the position with the least load. The slip ring is the core component of the single-point mooring system that achieves this "weather vane effect." The slip ring mainly consists of an inner ring, an outer ring, a rotating bearing, and a locking gland. The inner ring is fixed to the turret, and the outer ring is connected to the buoy. Under the influence of environmental loads, the buoy rotates around the inner ring via the outer ring. The inner side of the slip ring's outer ring, that is, the surface in contact with the inner ring and the locking gland, is arranged with multiple grooves to accommodate the rotating bearings. The inner and outer rings rotate through multiple rotating bearings to ensure the rotation performance of the slip ring.

[0003] Slip rings are expensive to manufacture and require complex design and manufacturing techniques. Furthermore, a slip ring failure can not only paralyze the monocoque mooring system, causing significant economic losses, but also pose a significant threat to the safety of the moored buoy, with disastrous consequences.

[0004] Of course, in addition to the important role played by the slip ring, the turret is also crucial for achieving the "weather vane effect" of the single-pillar mooring system. Only when the turret and slip ring complement each other can the single-pillar mooring system achieve this "weather vane effect." Under the influence of wind, waves and currents, the mooring float not only rotates around the turret, but also generates axial tension, pressure and overturning torque on the slip ring. Furthermore, under extreme operating conditions such as wave impact, ship berthing collisions, sea ice compression, and earthquake shocks, the turret is inevitably subjected to impact, causing dents, deformation, and even fracture failure. Loading and damage to the slip ring and turret will affect the rotational performance of the slip ring, thus seriously affecting the safety performance of the single-pillar mooring system.

[0005] When studying the slip ring structure performance test device, the existing patent CN116659831A realizes the rotation of the slip ring by rotating the rotating platform to drive the liquid slip ring to rotate. However, in actual working conditions, the outer ring of the slip ring rotates around the inner ring driven by the connecting float to reflect the "weather vane effect".

[0006] Existing patent CN113904195A proposes a maintenance device for a slip ring in a single-pillar mooring production system, which can stably and quickly separate the inner and outer rings in the slip ring, but does not consider testing the rotation performance of the slip ring.

[0007] Existing technologies often only consider the impact of reciprocating rotation on the rotation performance of the slip ring. However, on the one hand, it can only achieve small-angle reciprocating rotation of the slip ring to test the rotation performance and service life of the slip ring structure, which is different from the actual working condition where the slip ring can rotate 360°. In addition, the impact of the turret being subjected to impact on the rotation performance of the slip ring is not considered. Summary of the Invention

[0008] The present invention aims to address at least one of the technical problems existing in the related art. To this end, it provides a test method and apparatus for the rotational fatigue and impact deformation of slip rings in a single-pillar mooring system. This method addresses the technical difficulties associated with slip ring and turret testing and improves the efficiency of slip ring performance testing.

[0009] The present invention provides a test method for rotational fatigue and impact deformation of a slip ring in a single-pillar mooring system. The slip ring includes an inner ring, an outer ring, a rotating bearing, and a locking gland. The inner ring is fixed to a turret, and the outer ring is connected to a buoy. The test method includes the following steps:

[0010] The turret is fixedly connected to the test device, the inner ring of the slip ring is fixedly connected to the turret, the outer ring clamp is fixed to the outer side wall of the outer ring, the height of the fixture and the excitation assembly is adjusted by the lifting assembly of the test device, the fixture is connected to the outer ring clamp, and the excitation assembly is aligned with the turret;

[0011] The driving assembly of the test device drives the outer ring to rotate around the inner ring, and at the same time controls the excitation assembly and / or the tension and compression assembly of the fixture and the rotation assembly of the fixture to apply loads to the turret and the slip ring to simulate actual working conditions, thereby obtaining a torque value output by the torque sensor of the fixture;

[0012] Turn off the driving assembly, the excitation assembly and / or the tension and compression assembly of the fixture and the rotation assembly of the fixture. When the torque value output by the torque sensor remains unchanged, record the final torque value and compare the final torque value with the torque value during the test to analyze the performance of the slip ring.

[0013] A further improvement of the test method for rotational fatigue and impact deformation of the slip ring of the single-pillar mooring system of the present invention is that when the slip ring is subjected to impact force from the environment under actual working conditions, the excitation component is controlled to apply a load to the turret.

[0014] A further improvement of the test method for rotational fatigue and impact deformation of the slip ring of the single-column mooring system of the present invention is that when the slip ring is subjected to axial tension, pressure and overturning moment from the environment under actual working conditions, the tension and compression components and the rotation components of the clamp are controlled to apply load to the outer ring through the outer ring clamp.

[0015] A further improvement of the test method for rotational fatigue and impact deformation of the slip ring of the single-column mooring system of the present invention is that when the slip ring is subjected to impact force, axial tension, pressure and overturning moment from the environment under actual working conditions, the vibration excitation component, the tension and compression component of the clamp and the rotation component are controlled to apply loads to the turret and the slip ring at the same time.

[0016] The further improvement of the test method for rotation fatigue and impact deformation of the slip ring of the single-pillar mooring system of the present invention is that it includes:

[0017] Compare the final torque value with the torque value during the test to determine whether the actual working conditions have a permanent impact on the performance of the slip ring;

[0018] When the judgment result is yes, it is defined that in the actual working condition, the slip ring and the turret need to be repaired and / or replaced; otherwise, the slip ring and the turret remain unchanged.

[0019] A further improvement of the test method for rotational fatigue and impact deformation of the slip ring of the single-pillar mooring system of the present invention is that it also includes:

[0020] When evaluating the service life of the slip ring, the drive assembly is controlled to drive the slip ring to keep rotating, and the torque value output by the torque sensor is used to analyze the structural durability of the slip ring, thereby evaluating the service life of the slip ring.

[0021] The present invention also provides a test device for the rotational fatigue and impact deformation of a slip ring of a single-pillar mooring system. The test device is used to perform the test method described above, including:

[0022] The base has a circular groove on its top surface corresponding to the turret, a first annular support is fixedly provided at the bottom end of the turret, and an annular column is provided on the top surface of the base. The first annular support is provided on the inner side of the annular column and is clamped in the circular groove;

[0023] A lifting assembly, the lifting assembly being arranged on the top surface of the base and located on the inner side of the annular column;

[0024] A driving assembly is provided on the annular column, and the driving assembly includes a driving gear;

[0025] A driven gear, the driven gear being rotatably connected to the top end of the annular column and located at the top of the lifting assembly, the driven gear being engaged with the driving gear;

[0026] A plurality of excitation components are provided, and each of the excitation components is located between the turret and the annular column;

[0027] A clamp, the clamp being mounted on the driven gear, the clamp comprising a jacket, a tension and compression assembly, and a rotation assembly, the jacket being used to connect to an outer ring clamp located on the outer ring;

[0028] The test method is performed by clamping the first annular support in the circular groove, and then fixing the second annular support to the outer wall of the turret, fixing the inner ring of the slip ring to the second annular support and the outer wall of the turret, and fixing the outer ring clamp to the outer wall of the outer ring, and then adjusting the height of the lifting assembly to adjust the vibration assembly to press against the outer wall of the turret, adjusting the height of the lifting assembly so that the jacket corresponds to the outer ring clamp, and fixing the jacket to the outer ring clamp, thereby executing the test method.

[0029] A further improvement of the test device for rotational fatigue and impact deformation of the slip ring of the single-column mooring system of the present invention is that the lifting assembly includes a lifting base plate fixed to the base, a telescopic rod erected on the lifting base plate and telescopically adjustable, and a lifting top plate fixed to the top end of the telescopic rod, and the clamp is connected to the lifting top plate.

[0030] A further improvement of the test device for rotation fatigue and impact deformation of the slip ring of the single-pillar mooring system of the present invention is that there is one tension and compression assembly, which is arranged along the radial direction of the turret, and two rotation assemblies are provided.

[0031] A further improvement of the test device for rotational fatigue and impact deformation of the slip ring of the single-column mooring system of the present invention is that the drive assembly includes a drive base plate fixed to the outer side wall of the annular column and the base, a drive rod erected on the drive base plate and telescopically adjustable, and a drive motor connected to the drive rod, the drive motor has a drive shaft extending in a vertical direction and rotatably adjustable, and the driving gear is connected to the drive shaft.

[0032] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0033] The test apparatus and test method of the present invention achieve 360-degree rotation of the outer ring around the inner ring of the slip ring, effectively reducing the requirements for test space. The present invention controls the drive assembly to drive the outer ring of the slip ring around the inner ring for short or long periods of time, and uses the outer ring's rotational torque output in real time by the torque sensor to reflect the slip ring's rotational performance and evaluate its service life. The present invention controls the excitation assembly and fixture to simulate conditions such as wave impact, collision and extrusion, earthquake impact, and slip ring overturning torque, as well as axial tension and compression. The rotational torque sensor on the fixture outputs the slip ring's rotational torque to reflect the slip ring's performance under different conditions. By compiling test data, a slip ring operating performance database is formed, providing data support and experimental basis for structural strength design and environmental risk assessment in engineering practice.

[0034] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 Schematic diagram of the test device for the rotation fatigue and impact deformation of the slip ring of the single column mooring system provided by the embodiment of the present invention Figure 1 .

[0037] Figure 2 Schematic diagram of the test device for the rotation fatigue and impact deformation of the slip ring of the single column mooring system provided by the embodiment of the present invention Figure 2 .

[0038] Figure 3 Schematic diagram of the test device for the rotation fatigue and impact deformation of the slip ring of the single column mooring system provided by the embodiment of the present invention Figure 3 .

[0039] Figure 4 Schematic diagram of a turret and a slip ring provided in an embodiment of the present invention.

[0040] Figure 5 Schematic diagram of a clamp provided in an embodiment of the present invention.

[0041] Figure 6 Schematic diagram of a slip ring, a turret, and a fixture provided in an embodiment of the present invention.

[0042] Reference numerals:

[0043] 1. Turret; 101. First annular support; 102. Second annular support; 2. Base; 3. Excitation assembly; 4. Lifting assembly; 5. Inner ring; 6. Outer ring; 601. Outer ring clamp; 7. Locking cover; 801. Drive motor; 802. Drive rod; 803. Driving gear; 9. Driven gear; 1001. Slip ring lower end fixing screw; 1002. Slip ring upper end fixing screw; 1101. Roller; 1102. Roller base; 12. Annular column; 1201. Cable hole; 13. Clamp; 1301. Jacket; 1302. Rotating assembly; 1303. Tension and compression assembly; 14. Column support; 15. Clamp fixing screw. DETAILED DESCRIPTION

[0044] To make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0045] The following combination Figure 1 The present invention describes a test method for rotational fatigue and impact deformation of a slip ring in a single-pillar mooring system. The slip ring includes an inner ring 5, an outer ring 6, a rotating bearing, and a locking gland 7. The inner ring 5 is fixed to the turret 1, and the outer ring 6 is connected to the buoy. The test method includes the following steps:

[0046] The turret 1 is fixedly connected to the test device, the inner ring 5 of the slip ring is fixedly connected to the turret 1, the outer ring clamp 601 is fixed to the outer side wall of the outer ring 6, the height of the fixture 13 and the excitation assembly 3 is adjusted by the lifting assembly 4 of the test device, the fixture 13 is connected to the outer ring clamp 601, and the excitation assembly 3 is aligned with the turret 1;

[0047] The driving assembly of the test device drives the outer ring 6 to rotate around the inner ring 5, and at the same time controls the excitation assembly 3 and / or the tension and compression assembly 1303 of the fixture 13 and the rotation assembly 1302 of the fixture 13 to apply loads to the turret 1 and the slip ring to simulate actual working conditions, thereby obtaining the torque value output by the torque sensor of the fixture 13;

[0048] Turn off the driving component, the excitation component 3 and / or the tension and compression component 1303 of the fixture 13 and the rotation component 1302 of the fixture 13. When the torque value output by the torque sensor remains unchanged, record the final torque value and compare the final torque value with the torque value during the test to analyze the performance of the slip ring.

[0049] In a preferred embodiment of the test method for rotational fatigue and impact deformation of the slip ring of the single-pillar mooring system of the present invention, when the slip ring is subjected to impact force from the environment under actual working conditions, the excitation component 3 is controlled to apply a load to the turret 1.

[0050] Specifically, when the sliding ring is subjected to axial tension, pressure and overturning moment from the environment under actual working conditions, the tension and compression component 1303 and the rotation component 1302 of the clamp 13 are controlled to apply load to the outer ring 6 through the outer ring clamp 601.

[0051] Specifically, when the slip ring is subjected to impact force, axial tension, pressure and overturning moment from the environment under actual working conditions, the excitation component 3, the tension and compression component 1303 of the fixture 13 and the rotation component 1302 are controlled to apply loads to the turret 1 and the slip ring at the same time.

[0052] Specifically, based on comparing the final torque value with the torque value during the test, it is determined whether the actual working condition has a permanent impact on the performance of the slip ring; when the judgment result is yes, it is defined that under the actual working condition, the slip ring and the turret 1 need to be repaired and / or replaced; otherwise, the slip ring and the turret 1 remain unchanged.

[0053] When studying the influence of working conditions such as wave impact, extrusion collision, and earthquake impact on the rotation performance of the slip ring, the excitation component 3 is controlled to apply load to the turret 1 when the slip ring is driven to rotate, so as to simulate the turret 1 being subjected to wave impact, extrusion collision, and earthquake impact. Then, the torque sensor on the fixture 13 synchronously outputs the driving torque size and change to analyze the influence of different working conditions on the rotation performance of the slip ring.

[0054] When studying the influence of axial tension, compression and overturning moment on the rotation performance of the slip ring, the clamp 13 is controlled to apply load to the outer ring 6 of the slip ring when the slip ring is driven to rotate, so as to simulate the axial tension, compression and overturning moment generated by the connecting float on the slip ring under the action of wind, wave and current loads, and then the torque sensor on the clamp 13 synchronously outputs the driving torque size and change to analyze the influence of different working conditions on the rotation performance of the slip ring.

[0055] like Figure 5 and Figure 6 As shown in FIG, the application of the overturning moment is achieved by controlling the rotating components in the symmetrically arranged fixture to rotate in opposite directions. The overturning moment is calculated as follows:

[0056]

[0057] in, is the overturning moment, 、 To control the driving torque applied by the fixtures on both sides, is the rotation radius of the rotating component in the fixture, It is the axial distance from the center of gravity of the contact surface between the outer ring clamp and the jacket to the rotating component, is the outer diameter of the outer ring, It is the axial distance from the center of gravity of the contact surface between the outer ring clamp and the jacket to the outside of the outer ring.

[0058] Specifically, if Figure 5As shown, the force provided by the clamp can be divided into situation A, situation B, and situation C. When the tension and compression components and the rotation component are not working, it is situation A; when the tension and compression components of the clamp are working, it is situation B; when the rotation component of the clamp is working, it is situation C.

[0059] When studying the influence of extreme working conditions on the rotation performance of the slip ring, the excitation component 3 and the fixture 13 can be controlled simultaneously to apply loads to the turret 1 and the slip ring, and then the torque sensor on the fixture 13 can synchronously output the driving torque size and changes to analyze the influence of extreme working conditions on the rotation performance of the slip ring.

[0060] Specifically, it also includes: when evaluating the service life of the slip ring, driving the slip ring to keep rotating by controlling the driving assembly, analyzing the torque value output by the torque sensor to analyze the structural durability of the slip ring, thereby evaluating the service life of the slip ring.

[0061] The present invention also provides a single column mooring system slip ring rotation fatigue and impact deformation test device, such as Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, using the test device to perform the test method as described above includes:

[0062] The base 2 has a circular groove on its top surface corresponding to the turret 1. A first annular support 101 is fixedly provided at the bottom end of the turret 1. An annular column 12 is provided on the top surface of the base 2. The first annular support 101 is provided on the inner side of the annular column 12 and is clamped in the circular groove.

[0063] A lifting assembly 4, which is disposed on the top surface of the base 2 and located inside the annular column 12;

[0064] A driving assembly is provided on the annular column 12 and includes a driving gear 803;

[0065] A driven gear 9 is rotatably connected to the top of the annular column 12 and is located at the top of the lifting assembly 4. The driven gear 9 is engaged with the driving gear 803. A roller base 1102 is provided at the top of the annular column 12. A roller 1101 is provided in the roller base 1102. The driven gear 9 is connected to the roller.

[0066] Excitation components 3, wherein a plurality of the excitation components 3 are provided and the excitation components 3 are located between the turret and the annular column;

[0067] A clamp 13 is mounted on the driven gear 9 and includes a jacket 1301 , a tension and compression assembly 1303 , and a rotation assembly 1302 . The jacket 1301 is used to connect to the outer ring clamp 601 located on the outer ring 6 .

[0068] By clamping the first annular support 101 in the circular groove, and then fixing the second annular support 102 to the outer wall of the turret 1, the inner ring 5 of the slip ring is fixedly connected to the second annular support 102 and the outer wall of the turret 1, and the outer ring clamping plate 601 is fixed to the outer wall of the outer ring 6 of the slip ring, and then adjusting the height of the lifting assembly 4 to adjust the vibration assembly 3 to press against the outer wall of the turret 1, adjusting the height of the lifting assembly 4 so that the jacket 1301 corresponds to the outer ring clamping plate 601, and fixing the jacket 1301 to the outer ring clamping plate 601, thereby executing the test method.

[0069] A first annular support 101 supports the turret 1. Screw holes are bored into the first annular support 101, and the size, number, and distribution of these holes match those in the circular groove of the base 2. A second annular support 102 is welded to the outside of the turret 1 to support the slip ring. Screw holes of the same size are bored into the second annular support 102 at equal intervals around the turret 1. These screw holes are used to secure the inner ring 5 of the slip ring. The welding height of the second annular support 102 can be adjusted flexibly based on testing requirements.

[0070] Among them, such as Figure 3 As shown, the slip ring comprises an inner ring 5, an outer ring 6, a rotating bearing, and a locking gland 7. The inner ring 5 has screw holes at its bottom, and the size, number, and distribution of these screw holes match those on the second annular support 102 welded to the outside of the turret 1. The inner ring 5 also has screw holes of the same size and spacing at its top. The outer ring 6 has bearing slots at its top and bottom for axial rotating bearings, and a bearing slot inside for radial rotating bearings. Four outer ring clamps with screw holes are welded to the outer side of the outer ring 6 at equal spacing and height. The number, size, and distribution of the screw holes on these outer ring clamps match those on the fixture 13 placed on the driven gear 9. During testing, the outer ring clamp 601 is secured to the fixture 13 using screws of appropriate size, thereby connecting the outer ring 6 to the driven gear 9. The weld height of the second annular support 102 is adjusted to achieve the desired height between the outer ring clamp and the fixture 13 for docking. The rotating bearings include the aforementioned axial and radial bearings. The inner and outer rings 5 ​​and 6 of the slip ring rotate relative to each other via the rotating bearings. The locking gland 7 has screw holes whose size, number, and distribution are consistent with those on the top of the inner ring 5.

[0071] Preferably, if Figure 3As shown, cable holes 1201 are spaced apart on the annular column 12 , and a plurality of column supports 14 are provided between the outer side of the annular column 12 and the base 2 . The column supports 14 and the cable holes 1201 are staggered.

[0072] Further, such as Figure 1 and Figure 2 As shown, the lifting assembly 4 includes a lifting bottom plate fixed to the base 2, a telescopic rod erected on the lifting bottom plate and telescopically adjustable, and a lifting top plate fixed to the top of the telescopic rod, and the clamp 13 is connected to the lifting top plate.

[0073] Furthermore, there is one tension-compression assembly 1303 , which is arranged along the radial direction of the turret 1 , and two rotation assemblies 1302 are provided.

[0074] The jacket 1301 is provided with an opening, which corresponds to the through hole of the outer ring clamping plate 601 and is fixed by bolt connection.

[0075] like Figure 4 As shown, the tension and compression assembly 1303 includes a tension and compression motor and a rotating sleeve. The tension and compression motor has a tension and compression shaft with adjustable length. The rotating sleeve is connected to the tension and compression shaft. A rotating shaft is provided in the tension and compression shaft. The rotating assembly 1302 includes a rotating motor. The rotating motor is driven and connected to the rotating shaft. One end of the sleeve 1301 is connected to the rotating shaft. Multiple torque sensors are installed in the rotating shaft and the sleeve 1301. The tension and compression motor works to apply tension or pressure to the sleeve 1301, and the rotating motor works to apply an overturning moment to the sleeve 1301.

[0076] There are four groups of excitation components 3. Circular grooves with equal intervals around the base 2 are set inside the annular column 12. According to test needs, the four groups of excitation components 3 can be disassembled and moved to adapt to turrets 1 of different sizes.

[0077] There are two groups of lifting assemblies 4, which are arranged inside the annular column 12 and symmetrically on both sides of the circular groove of the base 2. According to test needs, both groups of lifting assemblies 4 can be disassembled and moved to adapt to turrets 1 and slip rings of different sizes.

[0078] Furthermore, the driving assembly includes a driving base plate fixed to the outer wall of the annular column 12 and the base 2, a driving rod 802 erected on the driving base plate and telescopically adjustable, and a driving motor 801 connected to the driving rod 802. The driving motor 801 has a driving shaft extending in a vertical direction and rotatably adjustable, and the driving gear 803 is connected to the driving shaft.

[0079] When the rotation performance test of the slip ring is carried out, the driving motor 801 of the driving assembly is controlled to drive the driving gear 803 to rotate, and the driving gear 803 drives the driven gear 9 to rotate, and the driven gear 9 drives the outer ring 6 of the slip ring to rotate through the fixture 13. The torque sensor provided on the fixture 13 synchronously outputs the torque required to drive the slip ring to rotate and its change to reflect the rotation performance of the slip ring.

[0080] In one specific implementation, before starting the test, based on the dimensions of the turret 1 and the slip ring, the positions of the excitation assembly 3 and the lifting assembly 4 are adjusted to ensure that the excitation assembly 3 can contact the outer surface of the turret 1, the lifting top plate of the lifting assembly 4 is aligned with the screw holes on the outer ring clamp 601, and the welding height of the second annular support 102 on the turret 1 is determined to ensure that the height of the outer ring clamp 601 and the fixture 13 are appropriate for docking;

[0081] After adjusting the excitation assembly 3 and the lifting assembly 4 to the appropriate position and welding the second annular support 102 to the appropriate height of the turret 1, the turret 1 is lifted to the top of the circular groove of the base 2 by a sling, and then gradually lowered. With the assistance of the staff, the first annular support 101 of the turret 1 is placed into the circular groove of the base 2, and the angle of the turret 1 is adjusted until the screw holes on the first annular support 101 are concentrically aligned with the screw holes in the circular groove of the base 2. Then, the screws matching the screw holes are screwed into the screw holes to fix the turret 1 on the base 2.

[0082] Lift the inner ring 5 of the slip ring above the turret 1 by using a sling, then control the sling to gradually lower the inner ring 5. With the assistance of the staff, put it on the turret 1, and then continue to lower it until it contacts the second annular support 102 welded on the turret 1. Rotate the inner ring 5 until the screw holes on the bottom of the inner ring 5 are concentrically aligned with the screw holes on the second annular support 102. Then, screw the fixing screws 1001 at the lower end of the slip ring that match the screw holes into the screw holes, thereby fixing the inner ring 5 of the slip ring on the turret 1.

[0083] Control the lifting assembly 4 to raise its lifting top plate to a sufficient height, that is, when the screw holes on the outer ring clamping plate 601 of the slip ring are connected to the lifting top plate, the bottom of the outer ring 6 of the slip ring is higher than the top of the inner ring 5;

[0084] Use the sling to lift the outer ring 6 of the slip ring to the top of the turret 1, then control the sling to gradually lower the outer ring 6. With the assistance of the staff, connect the outer ring clamping plate 601 welded on the outside of the outer ring 6 to the lifting top plate of the lifting assembly 4, and then control the lifting assembly 4 to lower the outer ring 6 until it contacts the bottom of the inner ring 5.

[0085] Control the lifting assembly 4 to lower its lifting top plate to a height that does not affect the rotation of the outer ring 6. Preferably, the lifting assembly 4 is used to control the docking of the outer ring 6 and the inner ring 5 to avoid collision between the inner and outer rings 6 and affect the rotation performance of the slip ring;

[0086] Lift the locking gland 7 of the slip ring to the top of the turret 1 by using a sling, then gradually lower it. With the assistance of the staff, put it on the turret 1, and then lower it to contact the top of the inner ring 5 and the outer ring 6. Rotate the locking gland 7 until the screw holes on the locking gland 7 are concentrically aligned with the screw holes on the top of the inner ring 5. Use the matching fixing screws 1002 on the upper end of the slip ring to screw into the screw holes and fix the locking gland 7. This completes the assembly of the slip ring and limits the vertical movement of the outer ring 6.

[0087] Start the drive motors 801 of the two drive assemblies. The drive motors 801 control the driving gear 803 to rotate, thereby driving the driven gear 9 to rotate until the screw holes on the clamp 13 inside the driven gear 9 are concentrically aligned with the screw holes on the outer ring clamp 601. Then, turn off the drive motors 801 to stop the rotation of the driven gear 9. Then, fix the outer ring 6 of the slip ring and the driven gear 9 together using the clamp fixing screws 15.

[0088] The driving motor 801 of the control driving assembly drives the driving gear 803 to rotate, which in turn drives the driven gear 9 to rotate. The driven gear 9 drives the outer ring 6 of the slip ring to rotate through the clamp 13, thereby achieving the "weather vane effect" of the outer ring 6 rotating around the inner ring 5 when the slip ring is in operation;

[0089] When the excitation component 3 and the tension and compression component 1303 of the fixture 13 are not started, the torque sensor on the fixture 13 synchronously outputs the driving torque magnitude and change to reflect the rotation performance of the slip ring;

[0090] When studying the effects of wave impact, extrusion collision, earthquake impact, and other working conditions on the rotational performance of the slip ring, the excitation assembly 3 is controlled to apply a load to the turret 1 while the outer ring 6 of the drive slip ring is rotating to simulate the turret 1 being subjected to wave impact, extrusion collision, and earthquake impact. The torque sensor on the fixture 13 then synchronously outputs the magnitude and changes of the driving torque to analyze the effects of different working conditions on the rotational performance of the slip ring, and records the driving torque data under the action of the excitation assembly 3. The excitation assembly 3 is turned off, and after the driving torque data output by the torque sensor on the fixture 13 stabilizes, it is compared with the driving torque data before excitation to determine whether the impact on the structural strength and rotational performance of the slip ring caused by the impact on the turret 1 is permanent, thereby determining whether the turret 1 and the slip ring need to be repaired or even replaced.

[0091] When studying the effects of axial tension, compression, and overturning moments on the rotational performance of the slip ring, the clamp 13 is controlled to apply a load to the outer ring 6 of the slip ring through the outer ring clamp 601 while the outer ring 6 of the slip ring is driven to rotate, so as to simulate the axial tension, compression, and overturning moments generated by the connecting float on the slip ring under the action of wind, wave, and current loads. The torque sensor on the clamp 13 then synchronously outputs the magnitude and variation of the driving torque to analyze the effects of different working conditions on the rotational performance of the slip ring, and records the driving torque of the slip ring under the action of the clamp 13. The rotating assembly 1302 in the clamp 13 is closed, and after the slip ring driving torque data output by the torque sensor on the clamp 13 stabilizes, it is compared with the torque data before driving to determine whether the effects on the rotational performance of the slip ring caused by the axial tension, compression, and overturning moment from the connecting float are permanent, thereby determining whether the slip ring needs to be repaired or even replaced.

[0092] When studying the influence of extreme working conditions on the rotation performance of the slip ring, the excitation component 3 and the fixture 13 can be controlled simultaneously to apply loads to the turret 1 and the slip ring outer ring 6, and then the torque sensor on the fixture 13 can synchronously output the driving torque size and changes to analyze the influence of extreme working conditions on the rotation performance of the slip ring.

[0093] When evaluating the service life of the slip ring, the driving assembly is controlled to drive the slip ring to rotate continuously for a long time. In order to evaluate the fatigue durability of the slip ring structure under long-term rotation operation, the torque value change output by the torque sensor on the fixture 13 is used to analyze the durability of the slip ring structure and evaluate the service life of the slip ring.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A test method for rotational fatigue and impact deformation of a slip ring in a single-pillar mooring system, wherein the slip ring comprises an inner ring, an outer ring, a rotating bearing, and a locking gland. The inner ring is fixed to a turret, and the outer ring is connected to a buoy. The test method comprises the following steps: The turret is fixedly connected to the test device, the inner ring of the slip ring is fixedly connected to the turret, the outer ring clamp is fixed to the outer side wall of the outer ring, the height of the fixture and the excitation assembly is adjusted by the lifting assembly of the test device, the fixture is connected to the outer ring clamp, and the excitation assembly is aligned with the turret; The driving assembly of the test device drives the outer ring to rotate around the inner ring, and at the same time controls the excitation assembly and / or the tension and compression assembly of the fixture and the rotation assembly of the fixture to apply loads to the turret and the slip ring to simulate actual working conditions, thereby obtaining a torque value output by the torque sensor of the fixture; Turn off the driving assembly, the excitation assembly and / or the tension and compression assembly of the fixture, and the rotation assembly of the fixture. When the torque value output by the torque sensor remains unchanged, record the final torque value, and compare the final torque value with the torque value during the test to analyze the performance of the slip ring. When the sliding ring is subjected to impact force from the environment under actual working conditions, the excitation component is controlled to apply load to the turret; when the sliding ring is subjected to axial tension, pressure and overturning moment from the environment under actual working conditions, the tension and compression component and the rotation component of the clamp are controlled to apply load to the outer ring through the outer ring clamp.

2. The test method for rotation fatigue and impact deformation of the slip ring of the single-pillar mooring system according to claim 1 is characterized in that: When the slip ring is subjected to impact force, axial tension, pressure and overturning moment from the environment under actual working conditions, the excitation assembly, the tension and compression assembly of the fixture and the rotation assembly are controlled to apply loads to the turret and the slip ring at the same time.

3. The test method for rotation fatigue and impact deformation of the slip ring of the single-pillar mooring system according to claim 1 is characterized in that: include: Compare the final torque value with the torque value during the test to determine whether the actual working conditions have a permanent impact on the performance of the slip ring; When the judgment result is yes, it is defined that in the actual working condition, the slip ring and the turret need to be repaired and / or replaced; otherwise, the slip ring and the turret remain unchanged.

4. The test method for rotation fatigue and impact deformation of a slip ring of a single-pillar mooring system according to claim 1 is characterized in that: Also includes: When evaluating the service life of the slip ring, the drive assembly is controlled to drive the slip ring to keep rotating, and the torque value output by the torque sensor is used to analyze the structural durability of the slip ring, thereby evaluating the service life of the slip ring.

5. A test device for the rotation fatigue and impact deformation of the slip ring of a single-pillar mooring system, characterized in that: Used to perform the test method according to any one of claims 1 to 4, comprising: The base has a circular groove on its top surface corresponding to the turret, a first annular support is fixedly provided at the bottom end of the turret, and an annular column is provided on the top surface of the base. The first annular support is provided on the inner side of the annular column and is clamped in the circular groove; A lifting assembly, the lifting assembly being arranged on the top surface of the base and located on the inner side of the annular column; A driving assembly is provided on the annular column, and the driving assembly includes a driving gear; A driven gear, the driven gear being rotatably connected to the top end of the annular column and located at the top of the lifting assembly, the driven gear being engaged with the driving gear; A plurality of excitation components are provided, and each of the excitation components is located between the turret and the annular column; A clamp, the clamp being mounted on the driven gear, the clamp comprising a jacket, a tension and compression assembly, and a rotation assembly, the jacket being used to connect to an outer ring clamp located on the outer ring; The test method is performed by clamping the first annular support in the circular groove, and then fixing the second annular support to the outer wall of the turret, fixing the inner ring of the slip ring to the second annular support and the outer wall of the turret, and fixing the outer ring clamp to the outer wall of the outer ring, and then adjusting the height of the lifting assembly to adjust the vibration assembly to press against the outer wall of the turret, adjusting the height of the lifting assembly so that the jacket corresponds to the outer ring clamp, and fixing the jacket to the outer ring clamp, thereby executing the test method.

6. The test device for the rotation fatigue and impact deformation of the slip ring of the single-pillar mooring system according to claim 5 is characterized in that: The lifting assembly includes a lifting bottom plate fixed to the base, a telescopic rod erected on the lifting bottom plate and telescopically adjustable, and a lifting top plate fixed to the top end of the telescopic rod, and the clamp is connected to the lifting top plate.

7. The test device for the rotation fatigue and impact deformation of the slip ring of the single-pillar mooring system according to claim 6 is characterized in that: There is one tension and compression assembly, which is arranged along the radial direction of the turret, and there are two rotation assemblies.

8. The test device for the rotation fatigue and impact deformation of the slip ring of the single-pillar mooring system according to claim 7 is characterized in that: The driving assembly includes a driving base plate fixed to the outer side wall of the annular column and the base, a driving rod erected on the driving base plate and telescopically adjustable, and a driving motor connected to the driving rod. The driving motor has a driving shaft extending in a vertical direction and rotatably adjustable, and the driving gear is connected to the driving shaft.

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