High-wear-resistance deep-sea mining non-adhesive flexible pipe joint and manufacturing method thereof

Abstract

The invention relates to a high-wear-resistance deep-sea mining non-adhesive flexible pipe joint and a manufacturing method thereof.The joint comprises a joint body of a hollow cylindrical structure, the joint body is arranged on an outer covering layer of a non-adhesive flexible pipe in a sleeving mode, and a body cavity of the joint body is connected with the non-adhesive flexible pipe through a cementing agent; the flange, the joint inner sleeve and the inner sealing ring are sequentially arranged on the non-adhesive flexible pipe in a sleeving mode and located in the main body cavity, the flange is located at the first end of the main body cavity and connected with the joint main body in a fastened mode, the joint inner sleeve is connected with the flange and the inner sealing ring in a fastened mode, and the joint inner sleeve is connected with the non-adhesive flexible pipe through a cementing agent; the second end part of the main body cavity is connected with the non-adhesive flexible pipe through the locking assembly and the cementing agent; the inner lining layer of the non-adhesive flexible pipe is provided with the outwards-turned parts extending in the radial direction and the circumferential direction of the first ends of the flanges, and after the two connectors are connected in a fastened mode through the two flanges, the two outwards-turned parts are connected in a sealed mode, so that the sealing capacity and the abrasion resistance of the connectors are improved.

Description

Technical Field

[0001] The present 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] At present, the external dependence of some strategic mineral resources in China has reached as high as 96%. There are huge amounts of resources such as polymetallic sulfides, polymetallic nodules, and cobalt-rich crusts at a depth of 2000m - 6000m in the international seabed, but the mining difficulty is extremely high, and the key equipment and technical problems have not been completely solved. The hydraulic lifting system is one of the most promising mining modes for commercial deep-sea mining. Due to the lightweight, fatigue resistance, wear resistance and other properties of the flexible mixed transportation pipe, it is more suitable for the exploitation of deep-sea mining systems. However, due to the limitations of the flexible pipe reel diameter, transportation and other aspects, the flexible riser cannot be infinitely long, and the connection joint is very important in the deep-sea mining flexible pipe system. Its main function is to achieve reliable connections between the flexible pipe and the upper hull structure and between flexible pipes, thereby ensuring the overall stability and operation efficiency of the system. The non-metallic flexible pipe for 6000m deep-sea mining has extremely high top tensile force, high sealing performance and high wear resistance, which requires the joint to have excellent tensile consistency, sealing performance and wear resistance in combination with the non-metallic non-bonded flexible pipe. Currently, metal joints are generally used for joints. Then, how to maintain the consistency of the sealing, wear resistance and tensile properties between the non-metallic flexible pipe and the metal joint to meet the production requirements of the deep-sea mining hydraulic lifting system is the core challenge and difficulty in the design and optimization of the non-metallic flexible pipe joint for deep-sea mining. Summary of the Invention

[0003] Aiming at the problems of weak tensile capacity and insufficient sealing capacity of the joint in the prior art, the present invention provides a highly wear-resistant non-bonded flexible pipe joint for deep-sea mining and a manufacturing method thereof. This joint can withstand a large axial tensile force 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: A highly wear-resistant non-bonded flexible pipe joint for deep-sea mining, including the following components with a split design: A joint body, which is a hollow cylindrical structure. The joint body is sleeved on the non-bonded flexible pipe, and the main cavity of the joint body is connected to the non-bonded flexible pipe through 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 fixedly connected to the joint body. The joint inner sleeve is fixedly connected to the flange and the inner sealing ring respectively. The flange, the joint inner sleeve, and the inner sealing ring are all connected to the non-bonded flexible pipe through an adhesive. A locking assembly, the second end of the main body cavity is connected to the non-bonded flexible pipe through the locking assembly and an adhesive. The lining layer of the non-bonded flexible pipe is provided with an everted 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 tightly connected through the two flanges, the two everted portions are hermetically connected to improve the sealing ability and wear resistance of the high-wear-resistant deep-sea mining non-bonded flexible pipe joint.

[0005] For the high-wear-resistant deep-sea mining non-bonded flexible pipe joint, preferably, the locking assembly includes an inner locking block, an outer locking block and an outer sheath fastening plate. A cavity for accommodating the inner locking block is provided between the outer covering layer and the tensile layer of the non-bonded flexible pipe. The outer locking block is sleeved on the outer covering layer, the second end of the main body cavity is sleeved on the outer locking block, and the outer sheath fastening plate is tightly connected to the second end of the main body cavity.

[0006] For the high-wear-resistant deep-sea mining non-bonded flexible pipe joint, preferably, a joint inner sleeve injection hole is provided on the joint inner sleeve, and a joint main body injection hole and an exhaust hole are provided on the joint main body.

[0007] For the high-wear-resistant deep-sea mining non-bonded flexible pipe joint, preferably, the adhesive is injected into the main body cavity through the joint main body injection hole to connect the joint main body with the tensile layer and the skeleton layer of the non-bonded flexible pipe.

[0008] For the high-wear-resistant deep-sea mining non-bonded flexible pipe joint, preferably, after the adhesive is injected into the main body cavity through the joint main body injection hole, it enters the cavity between the joint inner sleeve and the flange through the joint inner sleeve injection hole, and connects the joint inner sleeve, the inner sealing ring with the skeleton layer, the compensation reinforcement layer and the internal pressure reinforcement layer of the non-bonded flexible pipe.

[0009] For the high-wear-resistant deep-sea mining non-bonded flexible pipe joint, preferably, after the adhesive enters the cavity between the joint inner sleeve and the flange through the joint inner sleeve injection hole, it enters between the flange and the lining layer through the injection hole of the flange to connect the two.

[0010] For the high-wear-resistant deep-sea mining non-bonded flexible pipe joint, preferably, the lower end of the joint inner sleeve is provided with a taper angle, and the lower end of the inner sealing ring is provided with a conical surface adapted to the taper angle.

[0011] For the high-wear-resistant deep-sea mining non-bonded flexible pipe joint, preferably, the adhesive includes any one of epoxy resin adhesives, polyurethane adhesives, phenolic resin adhesives or urea-formaldehyde resin adhesives.

[0012] For the described highly wear-resistant non-bonded flexible pipe joint for deep-sea mining, preferably, the inner sleeve of the joint, the inner sealing ring, and the turned-out part jointly form an inner sealing structure.

[0013] The second aspect of the present invention provides a manufacturing method for a highly wear-resistant non-bonded flexible pipe joint for deep-sea mining, including the following steps: Trim each layer of the non-bonded flexible pipe to expose each layer, and the layers are distributed in a stepped shape; Slip the outer sheath fastening disc, the outer locking block, and the joint body onto the outer covering layer of the non-bonded flexible pipe; Insert the inner locking block into the cavity between the outer covering layer and the tensile layer, and then use the third bolt to tightly connect the outer sheath fastening disc, the outer locking block, and the joint body; Successively slip on the inner sealing ring, the inner sleeve of the joint, and the flange, and push them to the designated positions. Use the first bolt to tightly connect the inner sleeve of the joint and the flange, use the fourth bolt to tightly connect the flange and the joint body, and use the second bolt to tightly connect the inner sealing ring and the inner sleeve of the joint; After heating and melting the inner lining layer at the end of the flange, insert it into a shaping mold. The flange is subjected to an inward extrusion force, and the heated and softened inner lining layer material is extruded and deformed, and cooled and solidified to form a turned-out part extending radially and circumferentially along the flange; After evacuating the glue injection holes of the joint body, the glue injection holes of the inner sleeve of the joint, and the glue injection holes of the flange, inject a cementing agent, and make it cure under certain temperature conditions to form a bonding structure, and finally obtain a highly wear-resistant non-bonded flexible pipe joint for deep-sea mining.

[0014] Due to the above technical solutions adopted by the present invention, it has the following advantages: 1. In the present invention, the fiber rope or composite material strip is connected inside the joint by injecting glue to ensure the tensile strength of the flexible riser connection system. By turning out the inner lining pipe, the necks of the two joints are completely wrapped inside the ultra-high molecular weight polyethylene inner lining pipe to ensure the wear resistance and sealing performance of the joint. On this basis, a manufacturing process for the non-bonded flexible pipe joint for deep-sea mining is proposed.

[0015] 2. The joint of the present invention is applicable to non-metallic non-bonded flexible pipes for deep sea, 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.

[0016] 3. The non-bonded flexible pipe joint for deep-sea mining of the present invention can meet the connection requirements of the non-metallic riser system for hydraulic lifting in deep-sea mining at a water depth of 6000m. The double-bonding structure provides stronger tensile strength for the non-bonded pipe in deep-sea mining, and the everted structure of the inner lining layer ensures the sealing ability and wear resistance of the joint. It provides a solid foundation for the subsequent commercial development of deep-sea mining. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the overall structure diagram of the non-bonded flexible pipe joint provided by this embodiment of the present invention; Figure 2 It is the schematic diagram of the glue injection hole and exhaust hole in the joint body provided by this embodiment of the present invention; Figure 3 It is the schematic diagram of the bolt connection of the joint flange provided by this embodiment of the present invention; Figure 4 It is the schematic diagram of the trimming of the end of the non-bonded flexible pipe body provided by this embodiment of the present invention; Figure 5 It is the schematic diagram of the heat setting of the inner lining layer provided by this embodiment of the present invention; Figure 6 It is the schematic diagram of the flange provided by this embodiment of the present invention; Figure 7 It is the schematic diagram of the joint inner sleeve provided by this embodiment of the present invention; Figure 8 It is the schematic diagram of the inner sealing ring provided by this embodiment of the present invention; Figure 9 It is the schematic diagram of the inner locking block provided by this embodiment of the present invention; Figure 10 It is the schematic diagram of the outer locking block provided by this embodiment of the present invention; The reference numerals in the drawings are as follows: 1 - Flange; 2 - Inner lining layer; 3 - Inner sleeve colloid; 4 - First bolt; 5 - Joint inner sleeve, 501 - Glue injection hole of joint inner sleeve; 6 - Inner sealing ring; 7 - Second bolt; 8 - Joint colloid; 9 - Joint body, 901 - Glue injection hole of joint body, 902 - Exhaust hole; 10 - Inner locking block; 11 - Third bolt; 12 - Outer locking block; 13 - Outer sheath fastening plate; 14 - Fourth bolt; 15 - Heat setting mold; 16 - Inner pressure enhancement layer; 17 - Compensation enhancement layer; 18 - Skeleton layer; 19 - Tensile layer; 20 - Outer covering layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention pertains. The terms "first", "second", "third", "fourth" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "comprising" or "including" mean that the elements or items appearing before the term cover the elements or items listed after the term and their equivalents, without excluding other elements or items. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0020] For the convenience of description, spatial relative relationship terms may be used in the text to describe the relationship between one element or feature shown in the figure and another element or feature. Such relative relationship terms, such as "inner", "outer", "inner side", "outer side", "below", "above", etc. These spatial relative relationship terms are intended to include different orientations of the device in use or operation other than the orientations depicted in the figure.

[0021] One of the prior arts is that Huang Ming et al. designed a flexible pipe joint with two elastic sealing rings for the non-bonded metal riser of offshore oil and gas. The first elastic sealing ring is arranged between the inclined surface and the guiding surface of the inner sleeve of the joint. The first elastic sealing ring is connected to the inclined surface and has a convex portion facing the guiding 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 difficulty is large. The joint adopts two sealing rings. The first sealing ring is a special-shaped structure, and high precision is required for the preliminary assembly to ensure coaxiality, which is not conducive to production application. Disadvantage 2: The wear resistance of the joint is insufficient. The neck of the metal joint is in direct contact with the internal fluid, and there is a risk of wear and thinning due to grit.

[0022] The second prior art is that Wang Sen et al. designed a flexible pipe joint with one or more annular sealing wedges for bonded flexible pipes used in oil and gas. An annular joint outer sleeve is provided on the outer circumference of the sealing wedge, and the inner wall shape of the joint outer sleeve matches and closely fits with the outer wall shape of the sealing wedge. However, there are the following problems. Disadvantage 1: The tensile capacity of the joint is insufficient. The joint and the flexible pipe are connected into a whole by mechanical tightening force. This structure cannot withstand large axial tensile forces and is not suitable for connecting risers in ultra-deep sea of 6000m. Disadvantage 2: The anti-wear capacity of the neck is insufficient. The inner wall of the neck is in direct contact with the internal fluid, and there is a risk of wear and thinning due to grit. The reserved channel is easily worn through, resulting in joint failure. Disadvantage 3: It is not applicable to different forms of pipe body structures. 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.

[0023] The third prior art is that Bao Xingxian designed a marine flexible pipe joint structure, including a joint monomer, a sealing ring, a wedge block and a flange extrusion ring block. However, there are the following problems. Disadvantage 1: There is a risk of wear and thinning on the inner wall of the joint. The inner wall of the joint is in direct contact with the internal conveying medium and is prone to wear-through failure, and it cannot be applied to the development of 6000m deep-sea mining.

[0024] Based on the above technical problems, the present invention provides a highly wear-resistant non-bonded flexible pipe joint for deep-sea mining and its manufacturing method. This joint can withstand large axial tensile forces and has good wear resistance and sealing performance, meeting the connection requirements of ultra-deep sea non-metallic non-bonded flexible risers.

[0025] As Figure 1 、 Figure 2 shown, the highly wear-resistant non-bonded flexible pipe joint involved in the present invention includes the following components with a split design: A joint body 9, which is a hollow cylindrical structure. The joint body 9 is sleeved on the non-bonded flexible pipe, and the gap between the main cavity of the joint body 9 and the non-bonded flexible pipe is used for injecting cementing agent; a flange 1, a joint inner sleeve 5 and an 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 fixedly connected to the joint body 9. The joint inner sleeve 5 is fixedly 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 for injecting cementing agent; a locking assembly. The second end of the main cavity is connected to the non-bonded flexible pipe together through the locking assembly and the cementing agent; the inner lining layer 2 of the non-bonded flexible pipe is provided with an everted portion extending radially and circumferentially along the first end of the flange 1. After two highly wear-resistant non-bonded flexible pipe joints are fixedly connected through two flanges 1, the two everted portions are hermetically connected to improve the sealing ability and wear resistance of the highly wear-resistant non-bonded flexible pipe joint.

[0026] Further, as Figure 1 、 9, as shown in FIGS. 10, in a specific example 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 layer 20 and the tensile layer 19 of the non-bonded flexible pipe. The outer locking block 12 is sleeved on the outer covering layer 20 of the non-bonded flexible pipe. The second end of the main cavity is sleeved on the outer locking block 12, and the outer sheath fastening plate 13 is fixedly connected to the second end of the main cavity. The inner locking block 10 and the outer locking block 12 push the outer sheath fastening plate 13 through the third bolt 11 to change the relative distance, thereby changing the squeezing force between the outer locking block 12 and the inner locking block 10, preventing external seawater from entering the non-bonded flexible pipe, and achieving reliable external sealing.

[0027] Further, as Figure 2 shown, a joint body injection hole 901 and an exhaust hole 902 are provided on the joint body 9. The cementing agent enters the main cavity through the joint body injection hole 901, cementing the joint body 9 to the tensile layer 19 and the skeleton layer 18 of the non-bonded flexible pipe. The axial tension caused by the self-weight of the non-bonded flexible pipe and the action 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. By changing the specifications of the fourth bolt 14 and the type of cementing agent, the maximum tension that the joint body 9 can withstand can be changed. The cementing agent is injected into the main cavity through the joint body injection hole 901, and the cementing agent is cemented and fixed to the outer spiral strip of the skeleton layer 18 of the non-bonded flexible pipe, and an external pressure is applied to discharge the internal gas from the exhaust hole 902.

[0028] Further, as Figure 1 , 2 shown in FIGS. 7, a joint inner sleeve injection hole 501 is provided in the joint inner sleeve 5. After the cementing agent is injected into the main cavity through the joint body injection hole 901, the cementing agent enters the cavity between the joint inner sleeve 5 and the flange 1 through the joint inner sleeve injection hole 501, connecting the joint inner sleeve 5, the inner sealing ring 6 to the skeleton layer 18, the compensation reinforcement layer 17, and the internal pressure reinforcement layer 16 of the non-bonded flexible pipe, providing additional resistance to internal and external pressure and axial tension for the connection system.

[0029] Further, as Figure 1 , 3 shown in FIGS. 6, the flange 1 is sleeved on the inner lining layer 2 of the non-bonded flexible pipe, and there is no gap between them. The inner lining layer 2 is made of high molecular weight polyethylene material. As Figure 3 shown, the present invention realizes the connection between two high wear-resistant deep-sea mining non-bonded flexible pipe joints through bolt connection with the flange. By applying a pre-tightening force through the bolts, the turned-out parts of the ultra-high molecular weight polyethylene inner lining pipe are pre-tightened together, achieving reliable sealing between the high wear-resistant deep-sea mining non-bonded flexible pipe joints.

[0030] Further, asFigure 1 , 8 As shown in 8 , a taper angle is provided at the lower end of the inner sleeve 5 of the joint, and a conical surface adapted to the taper angle is provided at the lower end of the inner sealing ring 6. 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.

[0031] Further, the cementing agent includes any one of epoxy resin adhesives, polyurethane adhesives, phenolic resin adhesives, or urea-formaldehyde resin adhesives.

[0032] Further, as Figure 1 shown, the inner sleeve 5 of the joint, the inner sealing ring 6, and the turned-out part together form an inner sealing structure.

[0033] The second aspect of the present invention provides a manufacturing method for a highly wear-resistant deep-sea mining non-bonded flexible pipe joint, including the following steps: Trim each layer of the non-bonded flexible pipe so that each layer is exposed, and the layers are distributed in a stepped shape, as Figure 4 shown; Put the outer sheath fastening disc 13, the outer locking block 12, and the joint body 9 onto the outer covering layer 20 of the non-bonded flexible pipe, as Figure 1 shown; Insert the inner locking block 10 into the cavity between the outer covering layer 20 and the tensile layer 19, and then use the third bolt 11 to tightly connect the outer sheath fastening disc 13, the outer locking block 12, and the joint body 9; Successively put on the inner sealing ring 6, the inner sleeve 5 of the joint, and the flange 1, and push them to the designated positions. Use the first bolt 4 to tightly connect the inner sleeve 5 of the joint and the flange 1, use the fourth bolt 14 to tightly connect the flange 1 and the joint body 9, and use the second bolt 7 to tightly connect the inner sealing ring 6 and the inner sleeve 5 of the joint; After heating and melting the inner lining layer at the end of the flange 1, insert it into the shaping mold 15. The flange 1 is subjected to an inward squeezing force, and the heated and softened inner lining layer material is extruded and deformed, and cooled and solidified to form a turned-out part extending radially and circumferentially along the flange 1, as Figure 5 shown; After evacuating the glue injection holes 901 of the joint body, the glue injection holes 501 of the inner sleeve of the joint, and the glue injection holes of the flange 1, inject the cementing agent, and make it cure under certain temperature conditions to form a bonding structure, and finally obtain a highly wear-resistant deep-sea mining non-bonded flexible pipe joint.

[0034] The present invention turns the inner lining layer 2 of the non-bonded flexible pipe soft and turned out as the inner sealing structure and wear-resistant structure of the highly wear-resistant deep-sea mining non-bonded flexible pipe joint. By turning out the inner lining layer 2, the neck of the highly wear-resistant deep-sea mining non-bonded flexible pipe joint is completely wrapped, avoiding the wear of the ore particles on the neck of the flexible pipe during transportation, eliminating the thinning of the neck of the joint in production, and ensuring the structural strength of the neck of the joint.

[0035] In view of the characteristics of high tensile strength and high wear resistance of the non - bonded flexible mixed - transportation pipe joint for deep - sea mining, the present invention designs a non - bonded flexible pipe joint for deep - sea mining with high wear resistance and high strength. The present invention uses the inner - liner pipe heating and turning - out technology to completely wrap the neck of the metal joint in the ultra - high - molecular - weight polyethylene inner - liner pipe, avoiding the wear of 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 kind of joint is proposed. The present invention uses an adhesive to bond the tensile layer of the flexible pipe to the joint body 9, and compensates to bond the reinforcement layer 17 and the skeleton layer 18 to the inner sleeve 5 and the flange 1 of the joint, ensuring that the joint provides a large axial tensile force and realizing the tensile consistency between the pipe body and the joint.

[0036] The non - bonded flexible pipe joint for deep - sea mining of the present invention can meet the connection requirements of the hydraulic and lifting non - metal riser system for deep - sea mining at a water depth of 6000m. The double - adhesive structure provides a stronger tensile capacity for the non - bonded pipe for deep - sea mining, and the inner - liner turning - out structure ensures the sealing ability and wear - resistant performance of the joint. It provides a solid foundation for the subsequent commercial development of deep - sea mining.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A highly wear-resistant non-bonded flexible pipe joint for deep-sea mining, characterized in that It includes the following components: A joint body (9), which is a hollow cylindrical structure. The joint body (9) is sleeved on a non-bonded flexible pipe, and the main cavity of the joint body (9) is connected to the non-bonded flexible pipe through an adhesive. A flange (1), an inner joint sleeve (5) and an 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 fixedly connected to the joint body (9). The inner joint sleeve (5) is fixedly connected to the flange (1) and the inner sealing ring (6) respectively. The flange (1), the inner joint sleeve (5), and the inner sealing ring (6) are all connected to the non-bonded flexible pipe through 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 an adhesive. The inner liner (2) of the non-bonded flexible pipe is provided with an outwardly turned portion extending radially and circumferentially along the first end of the flange (1). After the two high-abrasion-resistant deep-sea mining non-bonded flexible pipe joints are fixedly connected through the two flanges (1), the two outwardly turned portions are hermetically connected to improve the sealing ability and wear resistance of the high-abrasion-resistant deep-sea mining non-bonded flexible pipe joint.

2. The high wear-resistant deep-sea mining non-bonded flexible pipe joint according to claim 1, characterized in that, 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 layer (20) and the tensile layer (19) of the non-bonded flexible pipe. The outer locking block (12) is sleeved on the outer covering layer (20). The second end of the main cavity is sleeved on the outer locking block (12), and the outer sheath fastening plate (13) is fixedly connected to the second end of the main cavity.

3. The high wear-resistant deep-sea mining non-bonded flexible pipe joint according to claim 1, characterized in that, The inner joint sleeve (5) is provided with an inner joint 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 deep-sea mining non-bonded flexible pipe joint according to claim 3, wherein The adhesive is injected into the main cavity through the joint body glue injection hole (901) to connect the joint body (9) to the tensile layer (19) and the skeleton layer (18) of the non-bonded flexible pipe.

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

6. The highly wear-resistant deep-sea mining non-bonded flexible pipe joint according to claim 5, wherein After the adhesive enters the cavity between the inner joint sleeve (5) and the flange (1) through the inner joint sleeve glue injection hole (501), it then enters between the flange (1) and the inner liner (2) through the glue injection hole of the flange (1) to connect the two.

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

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

9. The high wear-resistant deep-sea mining non-bonded flexible pipe joint according to claim 1, wherein, The inner sleeve (5) of the joint, the inner sealing ring (6) and the turned-out part together form an inner sealing structure.

10. A manufacturing method of a highly wear-resistant non-bonded flexible pipe joint for deep-sea mining, characterized in that, The steps are as follows: Trim each layer of the non-bonded flexible pipe to expose each layer, and the layers are distributed in a stepped shape; Put the outer sheath fastening disc (13), the outer locking block (12) and the joint body (9) onto the outer covering layer (20) of the non-bonded flexible pipe; Insert the inner locking block (10) into the cavity between the outer covering layer (20) and the tensile layer (19), and then use the third bolt (11) to tightly connect the outer sheath fastening disc (13), the outer locking block (12) and the joint body (9); Put on the inner sealing ring (6), the inner sleeve (5) of the joint and the flange (1) in sequence, and push them to the designated positions. Use the first bolt (4) to tightly connect the inner sleeve (5) of the joint and the flange (1), use the fourth bolt (14) to tightly connect the flange (1) and the joint body (9), and use the second bolt (7) to tightly connect the inner sealing ring (6) and the inner sleeve (5) of the joint; After heating and melting the inner lining layer (2) at the end of the flange (1), insert it into the shaping die (15). The flange (1) is subjected to an inward extrusion force, and the heated and softened inner lining layer (2) is extruded and deformed, and cooled and solidified to form a turned-out part extending radially and circumferentially along the flange (1); After evacuating the glue injection holes of the joint body (901), the glue injection holes of the inner sleeve (5) of the joint and the flange (1), inject the binder, and make it solidify under certain temperature conditions to form a bonding structure, and finally obtain a highly wear-resistant deep-sea mining non-bonded flexible pipe joint.

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