Ocean engineering submarine pipeline groove grinding device

Abstract

The invention relates to the technical field of ocean engineering equipment, in particular to an ocean engineering submarine pipeline groove polishing device which comprises a circular-ring-shaped polishing ring seat, and a circular-ring-shaped annular sliding rail is arranged on one side of the polishing ring seat; two sets of sliding seats are symmetrically installed on the annular sliding rail, and steering sliding blocks matched with the annular sliding rail in section size and in sliding fit with the annular sliding rail are installed at the bottoms of the sliding seats. According to the grinding device, circumferential rotation of the grinding component can be achieved through the arranged annular grinding ring base, the annular sliding rail arranged on one side of the grinding ring base, the sliding base installed on the annular sliding rail and the steering sliding block at the bottom in a matched mode; adjusting sliding grooves in the stand columns are matched with guide blocks at the two ends of the transverse rod, and the position of the transverse rod can be adjusted by adjusting connection of a hydraulic cylinder and a piston rod with the guide blocks. And through the combination of the guide slide way, the servo motor, the lead screw and the linear sliding block on the cross rod, the limiting mounting seat and the polishing rod can linearly move along the cross rod, and the groove of the submarine pipeline can be flexibly and accurately polished.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore engineering equipment, and particularly to an offshore engineering submarine pipeline bevel grinding device. Background Art

[0002] The offshore oil and gas industry, as an important part of the global energy supply system, is constantly expanding into deep - sea areas. Submarine pipelines, as the "energy arteries" connecting offshore oil and gas fields with onshore terminals, their construction quality is directly related to the stability and safety of energy transportation. In the entire submarine pipeline construction process, the grinding link of the pipeline bevel is crucial, laying the foundation for subsequent welding processes and playing a decisive role in the weld quality. In the current context of rapid technological development, exploring advanced submarine pipeline bevel grinding technology has become the key driving force for promoting the efficient and sustainable development of the offshore oil and gas development industry.

[0003] Traditional submarine pipeline bevel grinding mainly relies on manual operation, which exposes many insurmountable defects in the context of large - scale construction of modern offshore engineering. First of all, the efficiency of manual grinding is extremely low. The scale of submarine pipeline construction projects is huge, and the number of pipelines that need to be processed with bevels is numerous. The slow speed of manual grinding seriously delays the overall project progress, increasing the project cost significantly due to the extended construction period. According to relevant data statistics, in a medium - scale submarine pipeline laying project, if manual bevel grinding is used, the grinding link alone may take several months, far exceeding the expected construction period.

[0004] Secondly, it is difficult to ensure the consistency of the quality of manual grinding. There are differences in the technical levels, physical strength, and working states of different operators, resulting in uneven bevel quality. Unstable bevel quality will directly affect the welding effect, increasing the probability of defects such as pores and cracks in the weld. Once the weld quality has problems, in the harsh environments such as high pressure and strong corrosion at the seabed, the pipeline is extremely prone to leakage, not only causing energy waste, but also possibly triggering serious environmental pollution and safety accidents.

[0005] Moreover, the underwater operation environment poses a huge challenge to manual grinding. The high pressure, low temperature, and complex water flow environment at the seabed make it difficult for operators to maintain a good working state for a long time and there are great safety risks. The limited time for each manual diving operation further reduces the grinding work efficiency. At the same time, to ensure the safety of operators, a large number of professional diving equipment and safety guarantee personnel need to be equipped, which undoubtedly increases the operation cost of the project.

[0006] In addition, existing automated grinding equipment has poor adaptability in the seabed environment. The diameters and materials of subsea pipelines are diverse, and the operating space is limited. Conventional automated equipment is difficult to meet the grinding requirements under different working conditions. The lack of an efficient grinding device that can flexibly adapt to various subsea pipeline conditions has become a bottleneck restricting the improvement of the development efficiency of marine oil and gas resources. Therefore, it is urgent to develop a new type of bevel grinding device that can overcome the above defects and is suitable for the complex seabed environment, which is of great significance for promoting the progress of ocean engineering technology and ensuring energy security. Summary of the Invention

[0007] The purpose of the present invention is to provide a bevel grinding device for subsea pipelines in ocean engineering to solve the problems raised in the above background technology.

[0008] To achieve the above purpose, the present invention provides the following technical solutions:

[0009] A bevel grinding device for subsea pipelines in ocean engineering includes a circular grinding ring seat, and a circular ring-shaped sliding rail is provided on one side of the grinding ring seat.

[0010] Two groups of sliding seats are symmetrically installed on the circular ring-shaped sliding rail. Columns are installed on the two groups of sliding seats. Each group of columns is provided with an adjustment chute. A steering slider that is adapted to the cross-sectional size of the circular ring-shaped sliding rail and is in sliding fit is installed at the bottom of the sliding seat.

[0011] A cross bar parallel to the grinding ring seat is installed between the two groups of columns. A guiding chute is provided on the cross bar. Guide blocks that are adapted to the cross-sectional size of the adjustment chute and are in sliding fit are installed at both ends of the cross bar. Two groups of servo motors that work synchronously are symmetrically installed in the middle of the guiding chute. The output shaft of each group of servo motors is coaxially connected with a lead screw. A linear slider that is adapted to the cross-sectional size of the guiding chute and is in sliding fit is threadedly connected to each group of lead screws. A limit mounting seat is installed on each group of linear sliders. A grinding rod for grinding the bevel of the subsea pipeline is installed on the limit mounting seat.

[0012] An adjustment hydraulic cylinder is installed in the middle of the end of the column far from the sliding seat. The piston rod of the adjustment hydraulic cylinder passes through the end of the column and is connected to the guide block. The end of the piston rod is rotatably connected to the guide block through a bearing.

[0013] Preferably, mounting seats are symmetrically arranged at both ends of the side of the grinding ring seat far from the circular ring-shaped sliding rail. A clamping mechanism for fixing the subsea pipeline is installed on the mounting seats.

[0014] Preferably, the clamping mechanism includes two sets of symmetrically arranged fixed clamping rings, positioning blocks, threaded rods arranged on the upper and lower sides of the mounting seat, and several sets of guide rods. At both ends of each set of fixed clamping rings, sliding plates are symmetrically arranged, and the sliding plates are in threaded connection with the threaded rods.

[0015] Preferably, the cross-sections of the annular slide rail, the steering slider, the guide slideway, and the linear slider are all convex-shaped.

[0016] Preferably, four sets of guide rods are installed on each sliding plate. The guide rods are arranged between the positioning block and the mounting seat, and the sliding plates are in sliding fit with the guide rods.

[0017] Preferably, the threaded rod is in threaded connection with the positioning block, and the threaded rod is rotatably connected to the mounting seat through a bearing. And one end of the threaded rod far away from the mounting seat is coaxially installed with an adjusting turntable.

[0018] Preferably, the grinding rod includes an inner core rod and a grinding sleeve sleeved on the surface of the inner core rod.

[0019] Preferably, the grinding sleeve is made of a diamond or cemented carbide grinding sleeve with a thickness of 1-5 mm.

[0020] Preferably, an adjusting hydraulic cylinder is installed in the middle of one end of the column far away from the sliding seat. The piston rod of the adjusting hydraulic cylinder passes through the end of the column and is connected to the guide block.

[0021] Preferably, the end of the piston rod is rotatably connected to the guide block through a bearing.

[0022] Preferably, a connecting column for fixing the grinding rod and having a hollow interior is installed on the limit mounting seat. A connecting column is coaxially installed on the bottom surface of the grinding rod and is in plug-in fit with the connecting column.

[0023] Preferably, the connecting column and the connecting column are connected by a fixing bolt, and screw holes adapted to the size of the fixing bolt and in threaded connection are formed on the outer wall of the connecting column.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. In this underwater pipeline bevel grinding device for ocean engineering, by setting a grinding ring seat in the shape of a circular ring, the circular ring-shaped slide rail opened on one side provides a basic framework for the layout of the entire device. A steering slider that is adapted to the cross-sectional size of the circular slide rail and is in sliding fit is installed at the bottom of the slide seat, which enables the two groups of slide seats to rotate freely and stably on the circular slide rail; the vertical column installed on the slide seat, the adjustment chute opened on it cooperates with the guiding blocks installed at both ends of the cross bar, and the guiding blocks are adapted to the cross-sectional size of the adjustment chute and are in sliding fit. At the same time, the adjustment hydraulic cylinder installed in the middle of the end of the vertical column away from the slide seat, its piston rod passes through the end of the vertical column and is rotatably connected to the guiding block through a rotating shaft. When the adjustment hydraulic cylinder works, the telescopic movement of the piston rod can push the guiding block to move in the adjustment chute, thereby precisely adjusting the distance between the cross bar and the grinding ring seat to meet the needs of grinding the bevels of underwater pipelines with different diameters.

[0026] 2. In this underwater pipeline bevel grinding device for ocean engineering, two groups of servo motors that work synchronously are symmetrically installed in the guiding slideway opened on the cross bar. The output shaft of each servo motor is coaxially connected to a lead screw, and a linear slider that is adapted to the cross-sectional size of the guiding slideway and is in sliding fit is threadedly connected to the lead screw. When the servo motor operates, the lead screw drives the linear slider to slide smoothly in the guiding slideway, and the limit mounting seat and the grinding rod installed on the linear slider can achieve precise lateral position adjustment on the cross bar.

[0027] 3. In this underwater pipeline bevel grinding device for ocean engineering, the cross bar rotates, thereby driving the grinding rod installed on it to rotate. With the close cooperation and coordinated operation between various structures, the grinding rod can accurately position to each part of the underwater pipeline bevel, and efficiently and stably carry out the grinding operation on the bevel. It can not only improve the grinding quality, ensure the accuracy and surface finish of the bevel, but also greatly improve the grinding efficiency, meet the professionalism and high requirements for grinding the underwater pipeline bevel in ocean engineering, reduce the difficulty and workload of manual operation, and reduce the construction cost and time cost.

[0028] 4. In this underwater pipeline bevel grinding device for ocean engineering, a connecting column that is used to fix the grinding rod and is hollow inside is installed on the limit mounting seat. A connecting column that is inserted and matched with the connecting column is coaxially installed on the bottom surface of the grinding rod. The connecting column and the connecting column are connected by fixing bolts. Threaded holes that are adapted to the size of the fixing bolts and are in threaded connection are opened on the outer wall of the connecting column. It is simple and reliable. When it is necessary to replace the worn grinding rod, the new grinding rod can be quickly disassembled and installed, which greatly improves the maintenance efficiency of the equipment and reduces the downtime. Description of the Drawings

[0029] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are further explained in detail together with the embodiments of the present invention, but do not constitute a limitation to the present invention.

[0030] Figure 1 is a front structural schematic diagram of the present invention;

[0031] Figure 2 is a back structural schematic diagram of the present invention;

[0032] Figure 3 is a structural schematic diagram of the linear slide rail of the present invention;

[0033] Figure 4 is an exploded structural schematic diagram of the cross bar of the present invention;

[0034] Figure 5 is an exploded structural schematic diagram of the limit mounting seat and the grinding rod of the present invention;

[0035] Figure 6 is a cross-sectional structural schematic diagram of the grinding ring seat of the present invention;

[0036] The meanings of the reference numerals in the figure: 1, mounting seat; 2, guide rod; 3, sliding plate; 4, threaded rod; 5, fixed clamping ring; 6, annular slide rail; 7, sliding seat; 8, steering slider; 9, guide block; 10, cross bar; 11, servo motor; 12, lead screw; 13, linear slider; 14, limit mounting seat; 141, connecting column; 142, fixing bolt; 15, grinding rod; 151, inner core rod; 152, grinding sleeve; 153, connecting column; 154, screw hole; 16, positioning block; 17, adjusting turntable; 18, grinding ring seat; 19, column; 20, adjusting chute; 21, guide chute; 22, adjusting hydraulic cylinder; 23, piston rod. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention and the accompanying drawings of the specification. Obviously, the described embodiments are only a 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 those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "vertical", "horizontal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0039] An underwater pipeline bevel grinding device for ocean engineering, as Figures 1 - 6 shown, includes a circular grinding ring seat 18. An annular slide rail 6 in a circular shape is provided on one side of the grinding ring seat 18; two groups of slide seats 7 are symmetrically installed on the annular slide rail 6. A column 19 is installed on the two groups of slide seats 7. An adjustment chute 20 is provided on each group of columns 19. A steering slider 8 which is adapted to the cross-sectional dimension of the annular slide rail 6 and is in sliding fit therewith is installed at the bottom of the slide seat 7; A cross bar 10 parallel to the grinding ring seat 18 is installed between the two groups of columns 19. A guiding chute 21 is provided on the cross bar 10. Guide blocks 9 which are adapted to the cross-sectional dimension of the adjustment chute 20 and are in sliding fit therewith are installed at both ends of the cross bar 10. Two groups of servo motors 11 working synchronously are symmetrically installed in the middle of the guiding chute 21. The output shaft of each group of servo motors 11 is coaxially connected with a lead screw 12. A linear slider 13 which is adapted to the cross-sectional dimension of the guiding chute 21 and is in sliding fit therewith is threadedly connected to each group of lead screws 12. A limit mounting seat 14 is installed on each group of linear sliders 13. A grinding rod 15 for grinding the underwater pipeline bevel is installed on the limit mounting seat 14; An adjustment hydraulic cylinder 22 is installed in the middle of the end of the column 19 far away from the slide seat 7. The piston rod 23 of the adjustment hydraulic cylinder 22 passes through the end of the column 19 and is connected with the guide block 9. The end of the piston rod 23 is rotatably connected with the guide block 9 through a rotating shaft.

[0040] The underwater pipeline bevel grinding device for ocean engineering of the present invention provides a basic framework for the layout of the whole device by setting the circular grinding ring seat 18, and the circular annular slide rail 6 provided on one side thereof. The steering slider 8 which is adapted to the cross-sectional dimension of the annular slide rail 6 and is in sliding fit therewith is installed at the bottom of the slide seat 7, which enables the two groups of slide seats 7 to rotate freely and stably on the annular slide rail 6; The column 19 installed on the slide seat 7, the adjustment chute 20 provided thereon cooperates with the guide blocks 9 installed at both ends of the cross bar 10. The guide blocks 9 are adapted to the cross-sectional dimension of the adjustment chute 20 and are in sliding fit therewith. At the same time, the adjustment hydraulic cylinder 22 installed in the middle of the end of the column 19 far away from the slide seat 7, the piston rod 23 thereof passes through the end of the column 19 and is rotatably connected with the guide block 9 through a rotating shaft. When the adjustment hydraulic cylinder 22 works, the telescopic movement of the piston rod 23 can push the guide block 9 to move in the adjustment chute 20, thereby precisely adjusting the distance between the cross bar 10 and the grinding ring seat 18 to meet the requirements of grinding the underwater pipeline bevel with different pipe diameters.

[0041] Secondly, two sets of servo motors 11 that work synchronously and are symmetrically installed in the guiding slideway 21 opened on the cross bar 10. The output shaft of each servo motor 11 is coaxially connected to a lead screw 12, and a linear slider 13 that is threadedly connected to the lead screw 12 and is adapted to the cross-sectional size of the guiding slideway 21 and is in sliding fit therewith is provided. When the servo motor 11 operates, the lead screw 12 drives the linear slider 13 to slide smoothly in the guiding slideway 21, and the limit mounting seat 14 and the grinding rod 15 installed on the linear slider 13 can achieve precise lateral position adjustment on the cross bar 10.

[0042] During the actual working process, the cross bar 10 rotates, thereby driving the grinding rod 15 installed thereon to rotate. With the close cooperation and coordinated operation among the above various structures, the grinding rod 15 can accurately position to each part of the underwater pipeline groove, and efficiently and stably perform the grinding operation on the groove. It can not only improve the grinding quality, ensure the accuracy and surface finish of the groove, but also greatly improve the grinding efficiency, meet the professionalism and high requirements for the underwater pipeline groove grinding in ocean engineering, reduce the difficulty and workload of manual operation, and reduce the construction cost and time cost.

[0043] Furthermore, both ends of the side of the grinding ring seat 18 away from the annular slide rail 6 are symmetrically provided with mounting seats 1, and a clamping mechanism for fixing the underwater pipeline is installed on the mounting seats 1. The clamping mechanism includes two sets of symmetrically arranged fixed clamping rings 5, positioning blocks 16, threaded rods 4 arranged on the upper and lower sides of the mounting seats 1, and several groups of guide rods 2. Both ends of each set of fixed clamping rings 5 are symmetrically provided with sliding plates 3, and the sliding plates 3 are threadedly connected to the threaded rods 4. By rotating the adjusting turntable 17 at the end of the threaded rod 4, the sliding plates 3 are driven to slide on the guide rods 2 by screw transmission, driving the fixed clamping rings 5 to approach or separate, so as to achieve stable and precise fixation of the underwater pipeline and ensure that the pipeline does not shake during the grinding process.

[0044] It should be noted that the cross-sections of the annular slide rail 6, the steering slider 8, the guiding slideway 21, and the linear slider 13 are all convex-shaped, which can effectively prevent the components from having lateral displacement or getting out of the track during the sliding process, greatly enhancing the stability and guiding property of each component during sliding, and ensuring the accuracy and reliability of the operation of the grinding device.

[0045] Among them, four groups of guide rods 2 are installed on each sliding plate 3, the guide rods 2 are arranged between the positioning blocks 16 and the mounting seats 1, and the sliding plates 3 are in sliding fit with the guide rods 2, so that the sliding plates 3 are restricted and supported in multiple directions during the movement process, further improving the smoothness of the movement of the sliding plates 3 and enabling the fixed clamping rings 5 to clamp the pipeline more stably.

[0046] Specifically, the threaded rod 4 is threadedly connected to the positioning block 16, and the threaded rod 4 is rotatably connected to the mounting base 1 through a bearing. One end of the threaded rod 4 away from the mounting base 1 is coaxially installed with an adjusting turntable 17, which not only ensures the smoothness of the rotation of the threaded rod 4, but also can conveniently control the rotation of the threaded rod 4 through the adjusting turntable 17, so as to easily adjust the position of the fixed clamping ring 5, reduce the working intensity of the operator, and improve the convenience of operation.

[0047] Preferably, the grinding rod 15 includes a core rod 151 and a grinding sleeve 152 sleeved on the surface of the core rod 151. The grinding sleeve 152 is made of diamond or cemented carbide, and the thickness is 1-5 mm. Since diamond and cemented carbide have extremely high hardness and wear resistance, when the grinding rod 15 grinds the bevel of the submarine pipeline, it can efficiently remove materials, and at the same time ensure that it is not easily worn during long-term use, extend the service life of the grinding rod, and ensure the grinding quality.

[0048] In addition, a connecting column 141 for fixing the grinding rod 15 and having a hollow interior is installed on the limit mounting base 14. A connecting column 153 inserted and matched with the connecting column 141 is coaxially installed on the bottom surface of the grinding rod 15. The connecting column 153 and the connecting column 141 are connected by a fixing bolt 142. A screw hole 154 adapted to the size of the fixing bolt 142 and threadedly connected is provided on the outer wall of the connecting column 153. It is simple and reliable. When it is necessary to replace the worn grinding rod 15, a new grinding rod can be quickly disassembled and installed, greatly improving the maintenance efficiency of the equipment and reducing the downtime.

[0049] The working principle of the offshore engineering submarine pipeline bevel grinding device of the present invention:

[0050] (1) Pipeline fixing: Place the submarine pipeline between two groups of fixed clamping rings 5. Rotate the adjusting turntable 17. Since the threaded rod 4 is threadedly connected to the positioning block 16 and the sliding plate 3, and the threaded rod 4 is rotatably connected to the mounting base 1 through a bearing, the sliding plate 3 is driven to slide on the guide rod 2, so that the fixed clamping ring 5 approaches the pipeline and firmly clamps the pipeline.

[0051] (2) Preliminary adjustment of the grinding position: Start the adjusting hydraulic cylinder 22. The piston rod 23 pushes the guide block 9 to slide in the adjusting chute 20, drives the cross bar 10 to move, and makes the grinding rod 15 installed on the cross bar 10 approach the pipeline bevel for preliminary position adjustment.

[0052] (3)Precise adjustment of the grinding position: Start the servo motor 11. The servo motor 11 drives the lead screw 12 to rotate. Since the linear slider 13 is threadedly connected to the lead screw 12 and slidably engaged with the guiding slideway 21, the linear slider 13 moves within the guiding slideway 21, driving the limit mounting seat 14 and the grinding rod 15 to accurately move to the appropriate grinding position. The driving assembly includes the servo motor 11 and the lead screw 12. Two servo motors 11 are symmetrically installed in the middle of the slideway 10, as Figure 4 shown. By the servo motor 11, the lead screw 12 can be driven to rotate, and the grinding rods 15 on both sides can be driven to move closer to each other to the inner or outer side of the radial direction of the subsea pipeline. The grinding rods 15 are in contact with the subsea pipeline for grinding operations. The setting of the grinding rods 15 on both sides can improve the grinding efficiency.

[0053] (4)Grinding operation: The grinding sleeve 152 (made of diamond or cemented carbide) of the grinding rod 15 contacts the pipe groove. Start the external power mechanism (not shown in the figure, a waterproof motor can be used) to drive the cross bar 10 to rotate, and the grinding rod 15 starts to work. At the same time, the sliding seat 7 can rotate on the annular slide rail 6 through the steering slider 8 to achieve circumferential grinding around the pipe groove.

[0054] (5)Maintenance and replacement: If the grinding sleeve 152 is worn, unscrew the fixing bolt 142, pull out the grinding rod 15 from the connecting column 141, replace it with a new grinding rod 15 and reinstall and fix it.

[0055] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An underwater pipeline bevel grinding device for ocean engineering, characterized in that: It includes a polishing ring base (18) in the shape of a circular ring. One side of the polishing ring base (18) is provided with an annular slide rail (6) in a circular ring shape; Two groups of slide seats (7) are symmetrically installed on the annular slide rail (6). A column (19) is installed on the two groups of slide seats (7). Each group of columns (19) is provided with an adjustment chute (20). The bottom of the slide seat (7) is installed with a steering slider (8) that is adapted to the cross-sectional dimension of the annular slide rail (6) and is in sliding fit; A cross bar (10) parallel to the polishing ring base (18) is installed between the two groups of columns (19). A guiding slideway (21) is provided on the cross bar (10). The two ends of the cross bar (10) are installed with guiding blocks (9) that are adapted to the cross-sectional dimension of the adjustment chute (20) and are in sliding fit. Two groups of servo motors (11) that work synchronously are symmetrically installed in the middle of the guiding slideway (21). The output shaft of each group of servo motors (11) is coaxially connected with a lead screw (12). Each group of lead screws (12) is threadedly connected with a linear slider (13) that is adapted to the cross-sectional dimension of the guiding slideway (21) and is in sliding fit. A limit mounting seat (14) is installed on each group of linear sliders (13). A polishing rod (15) for polishing the groove of the subsea pipeline is installed on the limit mounting seat (14); The middle of the end of the column (19) away from the slide seat (7) is installed with an adjustment hydraulic cylinder (22). The piston rod (23) of the adjustment hydraulic cylinder (22) passes through the end of the column (19) and is connected with the guiding block (9). The end of the piston rod (23) is rotationally connected with the guiding block (9) through a bearing.

2. The bevel grinding device for a subsea pipeline in ocean engineering according to claim 1, wherein On both ends of the side of the polishing ring base (18) away from the annular slide rail (6), mounting seats (1) are symmetrically arranged. A clamping mechanism for fixing the subsea pipeline is installed on the mounting seats (1).

3. The underwater pipeline bevel grinding device for ocean engineering according to claim 2, characterized in that, The clamping mechanism includes two groups of symmetrically arranged fixed clamping rings (5), positioning blocks (16), threaded rods (4) arranged on the upper and lower sides of the mounting seats (1), and several groups of guiding rods (2). On both ends of each group of fixed clamping rings (5), sliding plates (3) are symmetrically arranged. The sliding plates (3) are in threaded connection with the threaded rods (4).

4. The underwater pipeline bevel grinding device for ocean engineering according to claim 1, characterized in that, The cross-sections of the annular slide rail (6), the steering slider (8), the guiding slideway (21), and the linear slider (13) are all in a convex shape.

5. The underwater pipeline bevel grinding device for ocean engineering according to claim 3, wherein, Four groups of guiding rods (2) are installed on each group of sliding plates (3). The guiding rods (2) are arranged between the positioning blocks (16) and the mounting seats (1). The sliding plates (3) are in sliding fit with the guiding rods (2).

6. The underwater pipeline bevel grinding device for ocean engineering according to claim 3, wherein The threaded rod (4) is in threaded connection with the positioning block (16). The threaded rod (4) is rotationally connected with the mounting seat (1) through a bearing. And the end of the threaded rod (4) away from the mounting seat (1) is coaxially installed with an adjustment turntable (17).

7. An underwater pipeline bevel grinding device for ocean engineering according to claim 1, characterized in that, The polishing rod (15) includes an inner core rod (151) and a polishing sleeve (152) sleeved on the surface of the inner core rod (151).

8. The bevel grinding device for a subsea pipeline in ocean engineering according to claim 7, characterized in that, The polishing sleeve (152) is made of a diamond or cemented carbide polishing sleeve, and the thickness is 1 - 5 mm.

9. The grooving and grinding device for a subsea pipeline in ocean engineering according to claim 1, wherein, A connecting column (141) which is used to fix the grinding rod (15) and is hollow inside is installed on the limiting mounting seat (14). A connecting column (153) which is coaxially installed on the bottom surface of the grinding rod (15) and is inserted and matched with the connecting column (141) is provided.

10. The bevel grinding device for a subsea pipeline in ocean engineering according to claim 9, wherein, The connecting column (153) and the connecting column (141) are connected by a fixing bolt (142). A screw hole (154) which is adapted to the size of the fixing bolt (142) and is in threaded connection is provided on the outer wall of the connecting column (153).

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