A high-strength mooring chain installation ring and its manufacturing method

Abstract

The present invention discloses a high-strength mooring chain installation ring and its manufacturing method, which relates to the technical field of temporary connecting parts for mooring chain installation in offshore oil platforms and wind power platforms. It includes a ring body, a lock, and a cover plate. An opening section is provided in the middle of the straight arm part of the ring body, and snap bosses are symmetrically arranged at both ends of the ring body. Corresponding slots to the snap bosses are symmetrically arranged at both ends of the lock. A convex block is provided in the middle of the inner side of the lock, and a groove corresponding to the convex block is provided in the middle of the inner side of the cover plate. A fastening bolt passes through the lock and is connected to the cover plate. The structure of the present invention is reasonably designed, with high connection strength. The installation ring is subjected to an inverted T-shaped force through the cooperation of the snap boss and the slot, and the breaking load can reach 40-60% of that of a common chain link of the same specification, which can ensure stable connection of mooring chain links, and is convenient for disassembly and assembly and can be reused.

Description

Technical Field

[0001] The present invention relates to the technical field of temporary connecting members for the installation of mooring chains on offshore oil platforms and wind power platforms, and particularly relates to a high-strength mooring chain installation ring and a manufacturing method thereof. Background Art

[0002] According to different installation methods, the installation of offshore oil platforms and wind power platforms sometimes requires the use of a temporary connecting accessory to connect the lead chain and the mooring chain. Its external dimensions are the same as those of the chain, and it can pass through the windlass, chain stopper, and fairlead. The installation ring after heat treatment has the technical characteristics of high strength and high toughness, and its external shape and internal quality should meet the relevant requirements of the classification society. To meet the above requirements, the external shape of the installation ring should be similar to that of an ordinary link, the link length and link width should be equal to those of a studless link, and it should also have a detachable function. Although it mainly serves as a traction function, the breaking load of the installation ring should reach at least 40% of the breaking load of an ordinary link.

[0003] The patent with publication number CN212443944U discloses a production positioning ring for anchor chains and mooring chains, including a C-shaped body, an upper cover plate, and a lower cover plate; cylindrical bosses symmetrically extend from the middle of both ends of the C-shaped body, and semi-circular grooves are respectively provided at both ends of the upper cover plate and both ends of the lower cover plate. The upper cover plate and the lower cover plate are respectively covered on the upper side and the lower side of the cylindrical boss, and the two are fixedly connected by several fasteners. This application is a positioning tooling for marking the welding joint direction of the positioning chain ring to prevent hinge during production. The ring body is stressed by fasteners, with low strength and small breaking load, and it cannot be used for the connection of mooring chains.

[0004] The manufacturing method of traditional connecting members uses forging. The blank of the product is obtained by combining open die forging and die forging, and then machining is performed to reach the final dimensions. However, for the installation ring product, the forging process has poor dimensional accuracy, low surface quality, and low production efficiency, which is not conducive to mass production and quality control. Summary of the Invention

[0005] The purpose of the present invention is to solve the above technical problems, and provide a high-strength mooring chain installation ring and a manufacturing method thereof, which can meet the installation and use performance of mooring chains and can be mass-produced.

[0006] In order to achieve the above technical objectives and meet the above technical requirements, the technical solution adopted by the present invention is as follows: A high-strength mooring chain installation ring, characterized in that: it includes a ring body, a lock, and a cover plate. An opening section is provided in the middle of the straight arm part of the ring body. Snap bosses are symmetrically arranged at both ends of the ring body. Corresponding slots are symmetrically arranged at both ends of the lock and are corresponding to the snap bosses. A convex block is arranged in the middle of the inner side of the lock, and a groove corresponding to the convex block is arranged in the middle of the inner side of the cover plate. A fastening bolt passes through the lock and is connected to the cover plate. Through the cooperation of the snap boss and the slot, the breaking load of the installation ring reaches 40-60% of that of a common chain link of the same specification.

[0007] Preferably: The snap boss includes a U-shaped flange and a U-shaped groove located on one side of the U-shaped flange. The installation ring is subjected to an inverted T-shaped force through the U-shaped flange and the U-shaped groove.

[0008] Preferably: The slot includes a clamping part and a concave part. The clamping part is matched with the U-shaped groove, and the concave part is matched with the U-shaped flange.

[0009] Preferably: The cover plate is provided with a trapezoidal cross-section, and an arc groove matching the inner arc surface of the ring body is arranged in the middle of the cover plate.

[0010] Preferably: The cross-section of the ring body is circular, the diameter of the circular cross-section is d, the ring length of the ring body is 6 times the diameter d, and the ring width is 3.35-3.6 times the diameter d.

[0011] Preferably: The length of the opening section is set to 2-3 times the diameter d of the cross-section of the ring body.

[0012] A manufacturing method of a high-strength mooring chain installation ring, characterized in that: it includes the following operating steps:

[0013] Step 1: The ring body is produced by round steel. First, it is formed by hot coiling, and then the joints are welded together by flash welding. Subsequently, it enters the deburring and shaping process to obtain a complete chain link; magnetic particle flaw detection is carried out on the chain link obtained by coiling.

[0014] Step 2: Cut off a middle section of the straight arm part of the chain link in Step 1, and reserve the length of the snap boss for subsequent processing;

[0015] Step 3: Machine-process the snap boss and the cover plate to obtain the processed ring body and cover plate;

[0016] Step 4: Process the lock by forging, and perform rough machining and magnetic particle flaw detection after forging;

[0017] Step 5: Heat-treat the ring body, cover plate, and lock obtained in Step 3 and Step 4. The heat treatment is carried out using the process of normalizing + quenching + tempering. The normalizing temperature is 860 - 920 °C, and after being taken out of the furnace, it is air-cooled; the quenching temperature is 880 - 930 °C, and water cooling is used for quenching; the tempering temperature is 580 - 630 °C, and water cooling is used after tempering.

[0018] Step 6: After heat treatment, perform finish machining on the ring body, cover plate, and lock, and then assemble them.

[0019] Step 7: Conduct a verification load test on the assembled product. The load magnitude is 65 - 75% of the breaking load of the installation ring.

[0020] Step 8: After the load test, conduct magnetic particle and ultrasonic inspections on the installation ring.

[0021] Preferably: The lock and the cover plate are made of the same material as the ring body.

[0022] Compared with the traditional structure, the beneficial effects of the present invention are as follows:

[0023] 1. The structure of the present invention is reasonably designed and has high connection strength. The mechanical processing buckle boss is connected to the processed cover plate and lock at the same time, and fastening bolts are used for fastening. The installation ring is subjected to an inverted T-shaped force through the cooperation of the buckle boss and the card slot. The breaking load can reach 40 - 60% of that of a common chain link of the same specification, which can ensure a stable connection of the mooring chain link. Moreover, it is convenient to disassemble and assemble, can be reused, can meet the installation and use performance of the mooring chain, and can be mass-produced.

[0024] 2. The ring body adopts a production method of first weaving the chain and then mechanical processing, which can greatly improve the machining accuracy and surface quality of the installation ring. The heat treatment is carried out using the process of normalizing + quenching + tempering. At the same time, a magnetic particle flaw detection process is added before heat treatment to detect surface defects in advance and avoid subsequent rework. This method is suitable for mass production, can significantly reduce material consumption, and improve production efficiency. Brief Description of the Drawings

[0025] Figure 1 It is an exploded view of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the present invention;

[0027] Figure 3 It is a structural schematic diagram of the ring body of the present invention;

[0028] Figure 4 It is a structural schematic diagram of the lock of the present invention;

[0029] Figure 5 It is a structural schematic diagram of the cover plate of the present invention;

[0030] In the figure: 1. Ring body, 11. Buckle boss, 111. U-shaped groove, 112. U-shaped flange, 12. Arc surface, 2. Lock, 21. Card slot, 211. Engaging part, 212. Concave part, 3. Cover plate, 31. Groove, 32. Arc-shaped groove, 4. Fastening bolt, 5. Opening section. Detailed implementation mode

[0031] The present invention will be further described below.

[0032] Refer to the attached Figures 1-5 , A high-strength mooring chain installation ring, characterized in that: it includes a ring body 1, a lock 2, and a cover plate 3. An opening section 5 is arranged in the middle of the straight arm part of the ring body 2. Buckle bosses 11 are symmetrically arranged at both ends of the ring body 1. Card slots 21 corresponding to the buckle bosses 11 are symmetrically arranged at both ends of the lock 2. A convex block 22 is arranged in the middle of the inner side of the lock 2. A groove 31 corresponding to the convex block 22 is arranged in the middle of the inner side of the cover plate 3. The fastening bolt 4 passes through the lock 2 and is connected to the cover plate 3. Through the cooperation of the buckle boss 11 and the card slot 21, the breaking load of the installation ring reaches 40-60% of that of an ordinary chain link of the same specification.

[0033] In this preferred embodiment, the buckle boss 11 includes a U-shaped flange 112 and a U-shaped groove 111 located on one side of the U-shaped flange 112. The installation ring is stressed in an inverted T shape formed by the U-shaped flange 112 and the U-shaped groove 111.

[0034] In this preferred embodiment, the card slot 21 includes an engaging part 211 and a concave part 212. The engaging part 211 cooperates with the U-shaped groove 111, and the concave part 212 cooperates with the U-shaped flange 112.

[0035] In this preferred embodiment, the cover plate 3 is provided with a trapezoidal cross-section, and an arc-shaped groove 32 matching the inner arc surface 12 of the ring body 1 is arranged in the middle of the cover plate 3.

[0036] In this preferred embodiment, the cross-section of the ring body 1 is circular, the diameter of the circular cross-section is d, the ring length of the ring body 1 is 6 times the diameter d, and the ring width is 3.35-3.6 times the diameter d.

[0037] In this preferred embodiment, the length of the opening section 5 is set to be 2-3 times the diameter d of the cross-section of the ring body 1.

[0038] A manufacturing method of a high-strength mooring chain installation ring, characterized in that: it includes the following operation steps:

[0039] Step 1: The ring body is produced by round steel. First, it is formed by hot coiling the ring, and then the joints are welded together by flash welding. Subsequently, it enters the deburring and shaping process to obtain a complete chain link; magnetic particle flaw detection is carried out on the chain link obtained by coiling the ring.

[0040] Step 2: Cut off a middle section of the straight arm part of the link in Step 1, and reserve the length of the buckle boss for subsequent processing;

[0041] Step 3: Machine the buckle boss and the cover plate to obtain the machined ring body and the cover plate;

[0042] Step 4: Machine the lock by forging, and perform rough machining and magnetic particle flaw detection after forging;

[0043] Step 5: Perform heat treatment on the ring body, cover plate, and lock obtained in Step 3 and Step 4. The heat treatment is carried out by the process of normalizing + quenching + tempering. The normalizing temperature is 860 - 920 °C, and it is air-cooled after being taken out of the furnace; the quenching temperature is 880 - 930 °C, and water cooling is used for quenching; the tempering temperature is 580 - 630 °C, and water cooling is used after tempering;

[0044] Step 6: After heat treatment, perform finish machining on the ring body, cover plate, and lock, and then assemble them;

[0045] Step 7: Perform a verification load test on the assembled product, and the load size is 65 - 75% of the breaking load of the installation ring;

[0046] Step 8: After the load test, perform magnetic particle and ultrasonic inspections on the installation ring.

[0047] In this preferred embodiment, the lock and the cover plate are made of the same material as the ring body.

[0048] Specifically in implementation, the installation ring is composed of a ring body 1, a lock 2, a cover plate 3, and fastening bolts 4. The overall shape of the installation ring is similar to a link. A section in the middle of the straight arm part is removed, and the end is machined with a buckle boss 11 through mechanical processing. The ring body 1 is connected with the lock 2 through the cooperation of the buckle boss 11 and the slot 21 on the lock 2. Then, the cover plate 3 is buckled on the lock 2. Threaded holes are provided on the cover plate 3, and the cover plate 3 and the lock 2 are fixed together by two fastening bolts 4 to prevent the components from falling off. The installation ring is stressed through the inverted T-shaped fit at the end, and the breaking load of the installation ring can reach 40 - 60% of that of a common link of the same specification. By the method of first making the chain and then processing, the machining accuracy and surface quality of the installation ring can be greatly improved. At the same time, by adding a magnetic particle flaw detection process before heat treatment, surface defects can be detected in advance to avoid subsequent rework. This method is suitable for mass production and can significantly reduce material consumption and improve efficiency.

[0049] The above embodiments of the present invention are merely examples clearly illustrating what the present invention has done, but are not used to limit the protection scope of the present invention. All equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention should be defined by each claim.

Claims

1. A method for manufacturing a high-strength mooring chain mounting ring, the high-strength mooring chain mounting ring comprising a ring body (1), a lock buckle (2), and a cover plate (3), wherein the middle of the straight arm portion of the ring body (1) is provided with an opening section (5), both ends of the ring body (1) are symmetrically provided with buckle bosses (11), and both ends of the lock buckle (2) are symmetrically provided with buckle grooves (21) corresponding to the buckle bosses (11), characterized in that: The lock buckle (2) is provided with a protrusion (22) at the middle of the inner side, and the cover plate (3) is provided with a groove (31) corresponding to the protrusion (22) at the middle of the inner side. The fastening bolt (4) passes through the lock buckle (2) and is connected to the cover plate (3). Through the cooperation between the buckle boss (11) and the groove (21), and the protrusion (22) and the groove (31), the breaking load of the mounting ring reaches 40% to 60% of that of an ordinary chain ring of the same specification. The cover plate (3) is arranged to have a trapezoidal cross section, and the middle of the cover plate (3) is provided with an arc groove (32) matching the inner arc surface (12) of the ring body (1). The manufacturing method of the high-strength mooring chain mounting ring comprises the following steps: Step 1: The ring body (1) is produced from round steel, first formed by hot braiding, then the joints are welded together by flash welding, and then a burr removal and shaping process is performed to obtain a complete chain link; the chain link obtained by braiding is subjected to magnetic particle inspection; Step 2: Cut off the middle section of the straight arm of the chain link in step 1, leaving a length of the buckle boss (11) for subsequent processing; Step 3: machining the buckle boss (11) and the cover plate (3) to obtain a machined ring body (1) and a cover plate (3); Step 4: Processing the lock buckle (2) by forging, and performing rough processing and magnetic particle inspection after forging; the lock buckle (2) and the cover plate (3) are made of the same material as the ring body (1); Step 5: heat treating the ring body (1), cover plate (3), and lock buckle (2) obtained in step 3 and step 4, using a normalizing + quenching + tempering process, wherein the normalizing temperature is 860-920°C, and air cooling is performed after the furnace is taken out; the quenching temperature is 880-930°C, and water cooling is performed during quenching; the tempering temperature is 580-630°C, and water cooling is performed after tempering; Step 6: After heat treatment, the ring body (1), the cover plate (3) and the lock buckle (2) are finely processed and assembled; Step 7: Perform a verification load test on the assembled product, with the load size being 65-75% of the breaking load of the mounting ring; Step 8: After the load test, perform magnetic particle and ultrasonic inspection on the mounting ring.

2. The method for manufacturing a high-strength mooring chain mounting ring according to claim 1, characterized in that: The buckle boss (11) comprises a U-shaped flange (112) and a U-shaped groove (111) located on one side of the U-shaped flange (112); the mounting ring is subjected to force in an inverted T-shape formed by the U-shaped flange (112) and the U-shaped groove (111); the clamping groove (21) comprises a clamping portion (211) and an inner recess (212); the clamping portion (211) corresponds to the U-shaped groove (111), and the inner recess (212) corresponds to the U-shaped flange (112).

3. The method for manufacturing a high-strength mooring chain mounting ring according to claim 1, characterized in that: The cross section of the ring body (1) is arranged to be circular, the diameter of the circular cross section is d, the length of the ring body (1) is 6 times the diameter d, and the width of the ring body (1) is 3.35 to 3.6 times the diameter d.

4. The method for manufacturing a high-strength mooring chain mounting ring according to claim 1, characterized in that: The length of the opening section (5) is set to be 2 to 3 times the cross-sectional diameter d of the ring body (1).

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