A highly wear-resistant non-bonded flexible pipe joint for deep-sea mining and a manufacturing method thereof

Abstract

The present invention relates to a highly wear-resistant non-bonded flexible pipe joint for deep-sea mining and a manufacturing method thereof, the joint comprising: a joint body, which is a hollow cylindrical structure, the joint body is sleeved on the outer covering of the non-bonded flexible pipe, and the main cavity of the joint body and the non-bonded flexible pipe are connected by an adhesive; a flange, a joint inner sleeve and an inner sealing ring are sequentially sleeved on the non-bonded flexible pipe and located in the main cavity, the flange is located at the first end of the main cavity and is tightly connected to the joint body, the joint inner sleeve is tightly connected to the flange and the inner sealing ring respectively, and the joint inner sleeve and the non-bonded flexible pipe are connected by an adhesive; a locking assembly, the second end of the main cavity is connected to the non-bonded flexible pipe through the locking assembly and the adhesive; the inner lining layer of the non-bonded flexible pipe is provided with an outward-turned portion extending radially and circumferentially along the first end of the flange, and after the two joints are tightly connected by two flanges, the two outward-turned portions are sealed to improve the sealing ability and wear resistance of the joint.

Description

Technical Field

[0001] The invention relates to a highly wear-resistant non-bonded flexible pipe joint for deep-sea mining and a manufacturing method thereof, belonging to the technical field of deep-sea mining. Background Art

[0002] Currently, the international seabed resources of polymetallic sulfides, polymetallic nodules, and cobalt-rich crusts are vast, but their extraction is extremely challenging, with key equipment and technical challenges remaining unresolved. Hydraulic lift systems are one of the most promising mining models for commercializing deep-sea mining. Flexible mixed pipes are particularly well-suited for deep-sea mining systems due to their lightweight, fatigue-resistant, and wear-resistant properties. However, due to limitations such as the diameter of the flexible pipe reels and transportation, flexible risers cannot be made infinitely long. Connectors are crucial in deep-sea mining flexible pipe systems, ensuring reliable connections between the flexible pipe and the upper hull structure, as well as between the flexible pipes themselves, thereby ensuring overall system stability and operational efficiency. Non-metallic flexible pipes for 6,000-meter deep-sea mining possess exceptionally high top-tension strength, strong sealing properties, and high wear resistance. Therefore, the connectors must be compatible with non-metallic, non-bonded flexible pipes that exhibit excellent tensile strength consistency, sealing properties, and wear resistance. Currently, metal joints are generally used. Therefore, how to maintain consistency in the sealing, wear resistance, and tensile strength of non-metallic flexible pipes and metal joints to meet the production requirements of deep-sea mining hydraulic lifting systems is the core challenge and difficulty in the design and optimization of non-metallic flexible pipe joints for deep-sea mining. Summary of the Invention

[0003] In response to the problems of weak tensile strength and insufficient sealing ability of joints in the existing technology, the present invention provides a highly wear-resistant non-bonded flexible pipe joint for deep-sea mining and a manufacturing method thereof. The joint can withstand large axial tension and has good wear resistance and sealing performance, meeting the connection requirements of ultra-deep-sea non-metallic non-bonded flexible risers.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A highly wear-resistant non-bonded flexible pipe joint for deep-sea mining, comprising the following components of a split design:

[0006] The joint body is a hollow cylindrical structure, and the joint body is sleeved on the non-bonded flexible pipe. The main cavity of the joint body and the non-bonded flexible pipe are connected together by an adhesive;

[0007] The flange, the joint inner sleeve and the inner sealing ring are sequentially sleeved on the non-bonded flexible pipe and located in the main body cavity. The flange is located at the first end of the main body cavity and is tightly connected to the joint body. The joint inner sleeve is tightly connected to the flange and the inner sealing ring respectively. The flange, the joint inner sleeve, the inner sealing ring and the non-bonded flexible pipe are all connected together by an adhesive.

[0008] a locking assembly, wherein the second end of the main body cavity is connected to the non-bonded flexible tube via the locking assembly and the adhesive;

[0009] The inner lining layer of the non-bonded flexible pipe is provided with an outward-turned portion extending radially and circumferentially along the first end of the flange. After the two high-wear-resistant deep-sea mining non-bonded flexible pipe joints are fastened and connected by the two flanges, the two outward-turned portions are sealed and connected, thereby improving the sealing ability and wear resistance of the high-wear-resistant deep-sea mining non-bonded flexible pipe joints.

[0010] The highly wear-resistant non-bonded flexible pipe joint for deep-sea mining, preferably, the locking assembly includes an inner locking block, an outer locking block and an outer sheath fastening disk, a cavity for accommodating the inner locking block is provided between the outer covering and the tensile layer of the non-bonded flexible pipe, the outer locking block is sleeved on the outer covering, the second end of the main body cavity is sleeved on the outer locking block, and the outer sheath fastening disk is fastened to the second end of the main body cavity.

[0011] The highly wear-resistant non-bonded flexible pipe joint for deep-sea mining is preferably provided with a joint inner sleeve glue injection hole on the joint inner sleeve, and a joint body glue injection hole and an exhaust hole are provided on the joint body.

[0012] The highly wear-resistant non-bonded flexible pipe joint for deep-sea mining is preferably configured such that the adhesive is injected into the cavity of the main body through the glue injection hole of the joint body to connect the joint body with the tensile layer and the skeleton layer of the non-bonded flexible pipe.

[0013] The highly wear-resistant non-bonded flexible pipe joint for deep-sea mining is preferably configured such that the adhesive is injected into the main body cavity through the glue injection hole of the joint body, and then enters the cavity between the joint inner sleeve and the flange through the glue injection hole of the joint inner sleeve, thereby connecting the joint inner sleeve, the inner sealing ring, and the skeleton layer, the compensation reinforcement layer, and the internal pressure reinforcement layer of the non-bonded flexible pipe.

[0014] The highly wear-resistant non-bonded flexible pipe joint for deep-sea mining is preferably configured such that the adhesive enters the cavity between the inner sleeve of the joint and the flange through the glue injection hole of the inner sleeve of the joint, and then enters between the flange and the inner lining through the glue injection hole of the flange to connect the two together.

[0015] The highly wear-resistant non-bonded flexible pipe joint for deep-sea mining is preferably provided with a cone angle at the lower end of the joint inner sleeve, and a cone surface matching the cone angle is provided at the lower end of the inner sealing ring.

[0016] The highly wear-resistant non-bonded flexible pipe joint for deep-sea mining preferably comprises a binder comprising any one of epoxy resin adhesive, polyurethane adhesive, phenolic resin adhesive or urea-formaldehyde resin adhesive.

[0017] In the highly wear-resistant non-bonded flexible pipe joint for deep-sea mining, preferably, the joint inner sleeve, the inner sealing ring and the outward-turned portion together constitute an inner sealing structure.

[0018] A second aspect of the present invention provides a method for manufacturing a highly wear-resistant non-bonded flexible pipe joint for deep-sea mining, comprising the following steps:

[0019] Trim each layer of the non-bonded flexible pipe so that each layer is exposed and each layer is distributed in a stepped manner;

[0020] Slipping the outer jacket fastening disc, outer locking block, and joint body onto the outer covering of the non-bonded flexible pipe;

[0021] Inserting the inner locking block into the cavity between the outer cover and the tensile layer, and then fastening the outer sheath fastening disc, the outer locking block and the joint body together using a third bolt;

[0022] Insert the inner sealing ring, the joint inner sleeve and the flange in sequence and push them to the designated position. Fasten the joint inner sleeve and the flange with the first bolt, fasten the flange and the joint body with the fourth bolt, and fasten the inner sealing ring and the joint inner sleeve with the second bolt.

[0023] After the inner lining layer at the end of the flange is heated and melted, it is inserted into a shaping die. The flange is subjected to an inward extrusion force, which squeezes and deforms the heated and softened inner lining layer material, and cools and solidifies to form an outward-turned portion extending in the radial and circumferential directions of the flange.

[0024] After the glue injection holes of the joint body, the glue injection holes in the joint sleeve and the glue injection holes of the flange are vacuumed, the adhesive is injected and solidified under certain temperature conditions to form a bonding structure, and finally a highly wear-resistant deep-sea mining non-bonded flexible pipe joint is obtained.

[0025] The present invention has the following advantages due to the adoption of the above technical solution:

[0026] 1. This invention connects fiber ropes or composite material strips within the joints through glue injection, ensuring the tensile strength of the flexible riser connection system. By everting the inner liner, the necks of the two joints are completely encased within the ultra-high molecular weight polyethylene liner, ensuring the joints' wear resistance and sealing properties. Based on this, a manufacturing process for non-bonded flexible pipe joints for deep-sea mining is proposed.

[0027] 2. The joint of the present invention is suitable for deep-sea non-metallic non-bonded flexible pipes, and the connection objects can be fiber ropes (aramid fiber bundles, polyester fiber bundles), fiber-reinforced composite material strips (glass fiber reinforced resin strips, aramid fiber reinforced resin strips and carbon fiber reinforced resin strips) and fiber-reinforced composite material cylinders.

[0028] 3. This non-metallic, non-bonded, flexible pipe joint for deep-sea mining meets the connection requirements of non-metallic riser systems for hydraulic lifts in seabed mining at depths of 6,000 meters. Its double-bonded structure provides enhanced tensile strength for deep-sea mining non-bonded pipes, while the inner liner's outward-facing structure ensures the joint's sealing and wear resistance. This provides a solid foundation for the subsequent commercial development of deep-sea mining. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is an overall structural diagram of the non-bonded flexible pipe joint provided in this embodiment of the present invention;

[0030] Figure 2 A schematic diagram of the glue injection hole and the vent hole in the connector body provided in this embodiment of the present invention;

[0031] Figure 3 A schematic diagram of the bolt connection of the joint flange provided in this embodiment of the present invention;

[0032] Figure 4 A schematic diagram of trimming the end of a non-bonded flexible pipe body provided in this embodiment of the present invention;

[0033] Figure 5 A schematic diagram of heating and shaping the inner lining layer provided in this embodiment of the present invention;

[0034] Figure 6 A schematic diagram of a flange provided in this embodiment of the present invention;

[0035] Figure 7 A schematic diagram of a joint inner sleeve provided in this embodiment of the present invention;

[0036] Figure 8 A schematic diagram of an inner sealing ring provided in this embodiment of the present invention;

[0037] Figure 9 A schematic diagram of the inner locking block provided in this embodiment of the present invention;

[0038] Figure 10 A schematic diagram of the external locking block provided in this embodiment of the present invention;

[0039] The reference numerals in the figures are as follows:

[0040] 1-flange; 2-inner lining; 3-inner sleeve colloid; 4-first bolt; 5-joint inner sleeve, 501-joint inner sleeve glue injection hole; 6-inner sealing ring; 7-second bolt; 8-joint colloid; 9-joint body, 901-joint body glue injection hole, 902-exhaust hole; 10-inner locking block; 11-third bolt; 12-outer locking block; 13-outer sheath fastening plate; 14-fourth bolt; 15-forming mold; 16-internal pressure reinforcement layer; 17-compensation reinforcement layer; 18-skeleton layer; 19-tensile layer; 20-outer covering layer. DETAILED DESCRIPTION

[0041] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention are described clearly and completely below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by ordinary persons in this field based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0042] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second", "third", "fourth" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0043] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inner side," "outer side," "lower," "upper," etc. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0044] One of the existing technologies is that Huang Ming and others designed a flexible pipe joint with two elastic sealing rings for marine oil and gas metal non-bonded risers. The first elastic sealing ring is arranged between the inclined surface and the guide surface of the inner sleeve of the joint. The first elastic sealing ring is connected to the inclined surface. The first elastic sealing ring has a protrusion facing the guide surface; the second elastic sealing ring is connected to the bottom surface. However, there are the following problems. Disadvantage 1: The structure is complex and the assembly is difficult. The joint adopts two sealing rings. The first sealing ring is a special-shaped structure. The early assembly requires high precision to ensure coaxiality, which is not conducive to production application. Disadvantage 2: The joint has insufficient wear resistance. The metal joint neck is in direct contact with the internal fluid, and there is a risk of thinning due to gravel wear.

[0045] The second prior art is that Wang Sen and others designed a flexible pipe joint with one or more annular sealing wedges for bonded flexible pipes for oil and gas. An annular joint jacket is provided on the outer circumference of the sealing wedge, and the inner wall shape of the joint jacket matches the outer wall shape of the sealing wedge and fits tightly. However, there are the following problems: Disadvantage 1: The joint has insufficient tensile strength. The joint and the flexible pipe are connected as a whole by mechanical tightening force. This structure cannot withstand large axial tension and is not suitable for ultra-deep sea 6000m riser connection. Disadvantage 2: The neck has insufficient wear resistance. The inner wall of the neck is in direct contact with the internal fluid, and there is a risk of thinning due to gravel wear. The reserved channel is easily worn through, causing the joint to fail. Disadvantage 2: It is applicable to different forms of pipe body structure. This joint is only applicable to bonded oil and gas flexible pipes, and is no longer applicable to the structure of non-metallic non-bonded deep-sea mining flexible pipes.

[0046] The third existing technology involves a flexible marine pipe joint designed by Bao Xingxian, consisting of a joint unit, a sealing ring, a wedge block, and a flange extrusion ring block. However, this design suffers from the following drawbacks: The inner wall of the joint is susceptible to wear and thinning. Direct contact with the internal conveying medium can lead to wear-through failure, making it unsuitable for 6,000-meter deep-sea mining operations.

[0047] Based on the above technical problems, the present invention provides a highly wear-resistant non-bonded flexible pipe joint for deep-sea mining and a manufacturing method thereof. The joint can withstand large axial tension and has good wear resistance and sealing performance, meeting the connection requirements of ultra-deep-sea non-metallic non-bonded flexible risers.

[0048] like Figure 1 、 Figure 2 As shown, the highly wear-resistant non-bonded flexible pipe joint for deep-sea mining involved in the present invention includes the following components of a split design:

[0049] The joint body 9 is a hollow cylindrical structure. The joint body 9 is sleeved on the non-bonded flexible pipe. The gap between the main cavity of the joint body 9 and the non-bonded flexible pipe is used to inject adhesive; the flange 1, the joint inner sleeve 5 and the inner sealing ring 6 are sequentially sleeved on the non-bonded flexible pipe and located in the main cavity. The flange 1 is located at the first end of the main cavity and is tightly connected to the joint body 9. The joint inner sleeve 5 is tightly connected to the flange 1 and the inner sealing ring 6 respectively. The gap between the joint inner sleeve 5 and the non-bonded flexible pipe is used to inject adhesive; the locking assembly, the second end of the main cavity is connected to the non-bonded flexible pipe through the locking assembly and the adhesive; the inner lining layer 2 of the non-bonded flexible pipe is provided with an outward-turned portion extending radially and circumferentially along the first end of the flange 1. After the two high-wear-resistant deep-sea mining non-bonded flexible pipe joints are tightly connected by two flanges 1, the two outward-turned portions are sealed to improve the sealing ability and wear resistance of the high-wear-resistant deep-sea mining non-bonded flexible pipe joints.

[0050] Furthermore, if Figure 1 、 9 As shown in Figures 10 and 10, in a specific embodiment of the present invention, the locking assembly includes an inner locking block 10, an outer locking block 12, and an outer sheath fastening plate 13. A cavity for accommodating the inner locking block 10 is provided between the outer covering 20 and the tensile layer 19 of the non-bonded flexible tube. The outer locking block 12 is sleeved onto the outer covering 20 of the non-bonded flexible tube. The second end of the main body cavity is sleeved onto the outer locking block 12, and the outer sheath fastening plate 13 is fastened to the second end of the main body cavity. The inner locking block 10 and the outer locking block 12 push the outer sheath fastening plate 13 to change the relative distance via the third bolt 11, thereby changing the clamping force between the outer locking block 12 and the inner locking block 10, preventing external seawater from entering the non-bonded flexible tube and achieving a reliable external seal.

[0051] Furthermore, if Figure 2 As shown, the joint body 9 is provided with a joint body glue injection hole 901 and a vent hole 902. The adhesive enters the joint body cavity through the joint body glue injection hole 901, bonding the joint body 9 to the tensile layer 19 and the skeleton layer 18 of the non-bonded flexible tube. The axial tension caused by the weight of the non-bonded flexible tube and the effects of wind, waves and currents is transmitted to the joint body 9 through the tensile layer 19. The joint body 9 and the fourth bolt 14 bear the axial tension. The maximum tensile force that the joint body 9 can withstand can be changed by changing the specifications of the fourth bolt 14 and the type of adhesive. The adhesive is injected into the main cavity through the joint body glue injection hole 901, and the adhesive is bonded to the outer spiral strip of the non-bonded flexible tube skeleton layer 18. External pressure is applied to discharge the internal gas through the vent hole 902.

[0052] Furthermore, if Figure 1 、 2As shown in Figures 7 and 8, a joint inner sleeve glue injection hole 501 is provided in the joint inner sleeve 5. After the adhesive is injected into the main body cavity through the joint body glue injection hole 901, the adhesive enters the cavity between the joint inner sleeve 5 and the flange 1 through the joint inner sleeve glue injection hole 501, connecting the joint inner sleeve 5, the inner sealing ring 6 and the skeleton layer 18, the compensation reinforcement layer 17 and the internal pressure reinforcement layer 16 of the non-bonded flexible pipe, providing the connection system with additional resistance to internal and external pressure and axial tension.

[0053] Furthermore, if Figure 1 、 3 As shown in Figure 6, the flange 1 is mounted on the inner lining 2 of the non-bonded flexible pipe with no gap between them. The inner lining 2 is made of high molecular weight polyethylene. Figure 3 As shown, the present invention connects two highly wear-resistant, non-bonded flexible pipe joints for deep-sea mining by bolting and flange connection. The bolts apply a preload, tightening the everted sections of the ultra-high molecular weight polyethylene liner together, achieving a reliable seal between the highly wear-resistant, non-bonded flexible pipe joints for deep-sea mining.

[0054] Furthermore, if Figure 1 、 8 As shown, the lower end of the joint inner sleeve 5 is provided with a cone angle, and the lower end of the inner sealing ring 6 is provided with a cone surface adapted to the cone angle. By changing the pre-tightening force of the second bolt 7, the squeezing force of the inner sealing ring 6 on the non-bonded flexible pipe skeleton layer is changed.

[0055] Furthermore, the adhesive includes any one of epoxy resin adhesive, polyurethane adhesive, phenolic resin adhesive or urea-formaldehyde resin adhesive.

[0056] Furthermore, if Figure 1 As shown, the joint inner sleeve 5, the inner sealing ring 6 and the outward turning portion together constitute an inner sealing structure.

[0057] A second aspect of the present invention provides a method for manufacturing a highly wear-resistant non-bonded flexible pipe joint for deep-sea mining, comprising the following steps:

[0058] Trim each layer of the non-bonded flexible pipe so that each layer is exposed and each layer is distributed in a stepped manner, such as Figure 4 As shown;

[0059] The outer sheath fastening disc 13, the outer locking block 12 and the joint body 9 are put onto the outer covering 20 of the non-bonded flexible pipe, as shown in FIG. Figure 1 As shown;

[0060] Insert the inner locking block 10 into the cavity between the outer cover 20 and the tensile layer 19, and then use the third bolt 11 to fasten the outer sheath fastening plate 13, the outer locking block 12 and the joint body 9;

[0061] Insert the inner sealing ring 6, the joint inner sleeve 5 and the flange 1 in sequence and push them to the designated position. Use the first bolt 4 to fasten the joint inner sleeve 5 and the flange 1, use the fourth bolt 14 to fasten the flange 1 and the joint body 9, and use the second bolt 7 to fasten the inner sealing ring 6 and the joint inner sleeve 5.

[0062] After the lining layer at the end of the flange 1 is heated and melted, it is inserted into the shaping mold 15. The flange 1 is subjected to an inward extrusion force, which squeezes and deforms the heated and softened lining layer material, and cools and solidifies to form an outward-turned portion extending in the radial and circumferential directions of the flange 1. Figure 5 As shown;

[0063] After vacuuming the glue injection hole 901 of the joint body, the glue injection hole 501 in the joint sleeve and the glue injection hole of the flange 1, the adhesive is injected and solidified under certain temperature conditions to form a bonding structure, thereby finally obtaining a highly wear-resistant deep-sea mining non-bonded flexible pipe joint.

[0064] The present invention heats, softens and everts the inner lining layer 2 of the non-bonded flexible pipe as an internal sealing structure and wear structure of a high-wear-resistant deep-sea mining non-bonded flexible pipe joint. The neck of the high-wear-resistant deep-sea mining non-bonded flexible pipe joint is completely wrapped by everting the inner lining layer 2, thereby avoiding the wear of the flexible pipe neck by ore particles during transportation, preventing the joint neck from becoming thinner during production, and ensuring the structural strength of the joint neck.

[0065] The present invention designs a wear-resistant and high-strength non-bonded flexible pipe joint for deep-sea mining, targeting the high tensile strength and high wear resistance of non-metallic non-bonded flexible mixed pipe joints for deep-sea mining. The present invention adopts the inner liner heating and eversion technology to completely wrap the metal joint neck in the ultra-high molecular weight polyethylene inner liner, avoiding the wear on the inner wall of the metal joint during the mineral transportation process and the strength attenuation caused by the thinning of the pipe wall. On this basis, a manufacturing method of this joint is proposed. The present invention uses an adhesive to bond the tensile layer of the flexible pipe to the joint body 9, and the compensation reinforcement layer 17 and the skeleton layer 18 to the joint inner sleeve 5 and the flange 1, ensuring that the joint provides a large axial tensile force and achieving tensile consistency between the pipe body and the joint.

[0066] The non-metallic, non-bonded, flexible pipe joint for deep-sea mining, developed by this invention, meets the connection requirements of hydraulic and non-metallic riser systems for seabed mining at depths of 6,000 meters. Its double-bonded structure provides enhanced tensile strength for deep-sea mining non-bonded pipes, while the inner liner's outward-facing structure ensures the joint's sealing and wear resistance. This provides a solid foundation for the subsequent commercial development of deep-sea mining.

[0067] 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 highly wear-resistant non-bonded flexible pipe joint for deep-sea mining, characterized in that: Includes the following components: A joint body (9) having a hollow cylindrical structure, wherein the joint body (9) is sleeved on the non-bonded flexible pipe, and the main body cavity of the joint body (9) and the non-bonded flexible pipe are connected together by an adhesive; The flange (1), the joint inner sleeve (5) and the inner sealing ring (6) are sequentially sleeved on the non-bonded flexible pipe and located in the main body cavity; the flange (1) is located at the first end of the main body cavity and is tightly connected to the joint body (9); the joint inner sleeve (5) is tightly connected to the flange (1) and the inner sealing ring (6) respectively; the flange (1), the joint inner sleeve (5), the inner sealing ring (6) and the non-bonded flexible pipe are all connected together by an adhesive; a locking assembly, wherein the second end of the main body cavity is connected to the non-bonded flexible tube via the locking assembly and the adhesive; The inner lining layer (2) of the non-bonded flexible pipe is provided with an outward-turned portion extending radially and circumferentially along the first end of the flange (1); after the two high-wear-resistant deep-sea mining non-bonded flexible pipe joints are fastened and connected through the two flanges (1), the two outward-turned portions are sealed and connected, thereby improving the sealing ability and wear resistance of the high-wear-resistant deep-sea mining non-bonded flexible pipe joints.

2. The highly wear-resistant non-bonded flexible pipe joint for deep-sea mining according to claim 1, characterized in that: The locking assembly comprises an inner locking block (10), an outer locking block (12) and an outer sheath fastening disc (13); a cavity for accommodating the inner locking block (10) is provided between the outer covering layer (20) and the tensile layer (19) of the non-bonded flexible tube; the outer locking block (12) is sleeved on the outer covering layer (20); the second end of the main body cavity is sleeved on the outer locking block (12); and the outer sheath fastening disc (13) is fastened to the second end of the main body cavity.

3. The highly wear-resistant non-bonded flexible pipe joint for deep-sea mining according to claim 1, characterized in that: The joint inner sleeve (5) is provided with a joint inner sleeve glue injection hole (501), and the joint body (9) is provided with a joint body glue injection hole (901) and an exhaust hole (902).

4. The highly wear-resistant non-bonded flexible pipe joint for deep-sea mining according to claim 3, characterized in that: Adhesive is injected into the main body cavity through the joint body glue injection hole (901) to connect the joint body (9) with the tensile layer (19) and the skeleton layer (18) of the non-bonded flexible pipe.

5. The highly wear-resistant non-bonded flexible pipe joint for deep-sea mining according to claim 4, characterized in that: After the adhesive is injected into the main body cavity through the adhesive injection hole (901) of the joint body, it enters the cavity between the joint inner sleeve (5) and the flange (1) through the adhesive injection hole (501) of the joint inner sleeve, thereby connecting the joint inner sleeve (5), the inner sealing ring (6) and the skeleton layer (18), the compensation reinforcement layer (17), and the internal pressure reinforcement layer (16) of the non-bonded flexible pipe together.

6. The highly wear-resistant non-bonded flexible pipe joint for deep-sea mining according to claim 5, characterized in that: The adhesive enters the cavity between the joint inner sleeve (5) and the flange (1) through the adhesive injection hole (501) of the joint inner sleeve, and then enters between the flange (1) and the inner lining layer (2) through the adhesive injection hole of the flange (1), connecting the two together.

7. The highly wear-resistant non-bonded flexible pipe joint for deep-sea mining according to claim 1, characterized in that: The lower end of the joint inner sleeve (5) is provided with a cone angle, and the lower end of the inner sealing ring (6) is provided with a cone surface adapted to the cone angle.

8. The highly wear-resistant non-bonded flexible pipe joint for deep-sea mining according to claim 1, characterized in that: The adhesive includes any one of epoxy resin adhesive, polyurethane adhesive, phenolic resin adhesive or urea-formaldehyde resin adhesive.

9. The highly wear-resistant non-bonded flexible pipe joint for deep-sea mining according to claim 1, characterized in that: The joint inner sleeve (5), the inner sealing ring (6) and the outward-turned portion together form an inner sealing structure.

10. A method for manufacturing a highly wear-resistant non-bonded flexible pipe joint for deep-sea mining, characterized in that: The steps include: Trim each layer of the non-bonded flexible pipe so that each layer is exposed and the layers are distributed in a stepped manner; Slipping the outer sheath fastening disc (13), the outer locking block (12) and the joint body (9) onto the outer covering (20) of the non-bonded flexible pipe; Inserting the inner locking block (10) into the cavity between the outer covering layer (20) and the tensile layer (19), and then fastening the outer sheath fastening plate (13), the outer locking block (12) and the joint body (9) together using a third bolt (11); Insert the inner sealing ring (6), the joint inner sleeve (5) and the flange (1) in sequence and push them to the designated position, fasten the joint inner sleeve (5) and the flange (1) with the first bolt (4), fasten the flange (1) and the joint body (9) with the fourth bolt (14), and fasten the inner sealing ring (6) and the joint inner sleeve (5) with the second bolt (7); After the inner lining layer (2) at the end of the flange (1) is heated and melted, it is inserted into a shaping mold (15). The flange (1) is subjected to an inward extrusion force, which squeezes and deforms the heated and softened inner lining layer (2), and cools and solidifies to form an outward-turned portion extending radially and circumferentially along the flange (1); After the glue injection hole (901) of the joint body, the glue injection hole (501) in the joint sleeve, and the glue injection hole of the flange (1) are evacuated, a binder is injected and solidified under certain temperature conditions to form a bonding structure, thereby finally obtaining a highly wear-resistant deep-sea mining non-bonded flexible pipe joint.

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