Composite flexible hose for deep-sea mining

Abstract

The invention relates to the technical field of deep sea conveying pipes, in particular to a composite flexible hose for deep sea mining, which comprises a hose inner layer, a compression-resistant layer, a tensile layer and a protective outer layer, the compression-resistant layer comprises a first compression-resistant layer and a second compression-resistant layer, the first compression-resistant layer is formed by spirally winding a first locking belt, the second compression-resistant layer is formed by spirally winding a second locking belt, and two adjacent winding rings formed by winding the first locking belt are connected through the second locking belt; the tensile layer comprises a first tensile layer formed by spirally winding a plurality of first steel belts along the axis direction of the hose inner layer. The defects that in the prior art, a corrugated hose is prone to being crushed in deep sea, and a hard steel pipe is prone to cracking under the condition that the hard steel pipe bears dynamic loads are overcome, high tensile strength and compressive strength are achieved, the corrugated hose is not prone to being crushed in the deep sea environment, and the hose body can bend and fluctuate under the dynamic loads, and fatigue fracture is not prone to being generated.

Description

Technical Field

[0001] The present invention relates to the technical field of deep-sea transport pipelines, and more specifically, to a composite flexible hose for deep-sea mining. Background Art

[0002] At present, the pipeline used in deep-sea mineral mining systems is composed of hard steel pipes and corrugated steel wire hoses, and is vertically extended into the deep sea to transport the slurry. However, the working environment of offshore oil and gas mining is quite harsh. When mining in the deep sea below 1500m, the pipeline must first contact with seawater, crude oil and natural gas, and must also withstand corrosion from high-temperature chlorides, sulfides, ammonia and other media, with the highest corrosion temperature reaching 300℃. Secondly, the inside of the pipeline must withstand the impact and friction of the seabed mineral particle slurry, and the outside must withstand the ultra-high pressure of seawater. The corrugated steel wire hose is easily crushed in the deep sea. Thirdly, the pipeline is hundreds of meters long and has a large deadweight. In addition, the simultaneous movement of the hull on the water surface and the seabed mining vehicle and the marine environment make the hard steel pipe bear dynamic loads for a long time. The hard steel pipe is easily fatigued and cracked when it is locally subjected to large tension and pressure and dynamic impact. Summary of the invention

[0003] In view of the problems in the above-mentioned prior art that corrugated hoses are easily crushed in the deep sea and hard steel pipes are prone to cracks when subjected to dynamic loads, the present invention provides a composite flexible hose for deep-sea mining, which has high tensile strength and compressive strength, is not easily crushed in a deep-sea environment, and the pipe body can bend and fluctuate under dynamic loads, and is not prone to fatigue fracture.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0005] A composite flexible hose for deep-sea mining comprises a hose inner layer, a pressure-resistant layer, a tensile layer and a protective outer layer arranged in sequence from the inside to the outside; the pressure-resistant layer comprises a first pressure-resistant layer and a second pressure-resistant layer, the first pressure-resistant layer is formed by spirally winding a first locking belt forming an angle of 50° to 89° with the axis of the hose inner layer along the axis direction of the hose inner layer, the second pressure-resistant layer is formed by spirally winding a second locking belt forming an angle of 50° to 89° with the axis of the hose inner layer along the axis direction of the hose inner layer, and two adjacent winding circles formed by the first locking belt are connected by the second locking belt; the tensile layer comprises a first tensile layer, the first tensile layer is formed by spirally winding a first steel belt arranged in parallel on the same horizontal plane at an angle of 15° to 45° with the axis of the hose inner layer and along the axis direction of the hose inner layer.

[0006] In the above technical solution, the first and second compression-resistant layers formed by the spiral winding of the first locking band and the second locking band can improve the radial compression resistance of the pipe, thereby reducing the risk of the pipe being compressed to the point of being blocked or crushed; and the first tensile layer formed by the spiral winding of multiple first steel bands along the axial direction of the inner layer of the hose can improve the axial tensile resistance of the pipe, so that the pipe is not easily broken under the deep sea pressure and its own gravity. Since the first locking band, the second locking band and the first steel band all form a certain angle with the axis of the inner layer of the hose, the pipe can have a certain flexibility. When the pipe is impacted by water flow or other large dynamic loads, it can use its own flexibility to bend to a certain extent, thereby dispersing the load and avoiding the load from being concentrated in a local position of the pipe, thereby improving the fatigue resistance of the pipe and preventing fatigue. The combination of the compression-resistant layer and the tensile-resistant layer can improve the reliability of the pipe in deep sea environments.

[0007] The first locking tape and the second locking tape may be connected by abutment, by clamping, or by bonding.

[0008] Preferably, the first locking band and the second locking band are connected by snapping, specifically, the first locking band has a first hook lock portion and a second hook lock portion protruding on the side of the first locking band away from the inner layer of the hose, and the second locking band is provided with a slot, and the adjacent second hook lock portions and first hook lock portions in the winding circle formed by winding the first locking band are both snapped with the slot. The winding circle formed by winding the first locking band can rotate with the second locking band as a fulcrum, and the second locking band can rotate with the first hook lock portion or the second hook lock portion as a fulcrum, and the rotational movement of the first locking band and the second locking band accumulates to form a large degree of bending of the pipe in the axial direction, so as to avoid external loads being concentrated at the same position on the pipe, thereby reducing the risk of fatigue fracture of the pipe.

[0009] Preferably, the width of the slot is greater than the sum of the width of the first hook locking portion and the width of the second hook locking portion, so that the two adjacent winding circles formed by the first locking tape can move relative to each other in the axial direction of the inner layer of the hose, thereby improving the flexibility of the pipe and further dispersing the dynamic load.

[0010] Preferably, the angles between the first locking band and the second locking band and the axis of the inner layer of the hose are both between 87° and 89°. At this angle, the first locking band and the second locking band can be spirally wound along the axis of the inner layer of the hose, and the first and second pressure-resistant layers formed by such winding have stronger radial compressive strength and higher flexibility of the pipe.

[0011] Preferably, the tensile layer further comprises a second tensile layer which is composed of a plurality of second steel strips arranged in parallel on the same horizontal plane, which form an angle of 15° to 45° with the axis of the hose inner layer and are spirally wound along the axis of the hose inner layer outside the first tensile layer, and the spiral direction of the second steel strip is opposite to that of the first steel strip. Adding such a second tensile layer can further improve the tensile resistance of the pipe in the axial direction and further improve the strength of the pipe.

[0012] Among them, the cross-sectional shape of the first steel belt and the second steel belt can be circular or rectangular. Preferably, the cross-sectional shape of the first steel belt and the second steel belt is rectangular. The rectangular first and second steel belts have a greater utilization rate of the layer space than the circular ones, so the strength of the tensile layer formed is also higher.

[0013] Preferably, a first wear-resistant layer is provided between the anti-compression layer and the anti-tensile layer, and a second wear-resistant layer is provided between the anti-tensile layer and the protective outer layer. The pipe will often swing during deep-sea use, resulting in friction between the anti-compression layer and the anti-tensile layer, causing layer wear. Therefore, the first wear-resistant layer is provided to separate the anti-compression layer from the anti-tensile layer, thereby reducing the friction and wear between the anti-compression layer and the anti-tensile layer, so as to extend the service life of the anti-compression layer and the anti-tensile layer; and the second wear-resistant layer can prevent the protective outer layer from directly contacting the anti-tensile layer, thereby reducing the friction and wear caused by the anti-tensile layer on the protective outer layer, reducing the risk of damage or cracking of the protective outer layer, thereby extending the service life of the entire pipe.

[0014] Preferably, the first wear-resistant layer and the second wear-resistant layer are both formed by spirally winding a plurality of layers of a polyester belt or a fiber belt that forms an angle with the axis of the hose inner layer along the axis direction of the hose inner layer. The first wear-resistant layer and the second wear-resistant layer formed by spirally winding a polyester belt or a fiber belt have high strength and good wear resistance and water resistance.

[0015] Preferably, a sealing layer is provided between the inner layer of the hose and the pressure-resistant layer. The sealing layer can separate the inner layer of the hose from the pressure-resistant layer, thereby preventing the pressure-resistant layer from directly contacting the inner layer of the hose and causing wear to the inner layer of the hose, thereby preventing the corrosive medium from leaking through the inner layer of the hose to the pressure-resistant layer and causing corrosion to the pressure-resistant layer, thereby extending the service life of the pipe material and allowing the pipe material to be used for a long time in a deep-sea environment.

[0016] Preferably, the sealing layer is made of high-density polyethylene material. High-density polyethylene has good rigidity and toughness, high corrosion resistance, and low permeability to the medium, and is a preferred material for the sealing layer.

[0017] Preferably, an identification band is provided on one side wall of the protective outer layer away from the inner layer of the hose, wherein the identification band may include a plurality of length markings spaced apart along the length direction of the pipe, and the identification band may also include a color band continuously arranged along the length direction of the pipe. It should be noted that the color band refers to a band structure whose color is obviously different from that of the protective outer layer. If the identification band includes a plurality of length markings, when an abnormality occurs in the pipe, the staff can quickly locate the abnormal position on the pipe according to the length marking, which is conducive to the inspection and maintenance of the pipe; if the identification band includes a color band, the staff can judge the degree of torsion of the pipe from a distance according to the deformation of the color band, thereby judging whether the pipe is scrapped.

[0018] In order to ensure that the compressive strength of the pipe can meet the requirements of long-term use of the pipe in a deep-sea environment, preferably, the radial thickness of the pressure-resistant layer is not less than 3 mm.

[0019] Preferably, the inner diameter of the inner layer of the hose is not less than 100 mm and the radial thickness is not less than 3 mm, so as to ensure the pipe transportation efficiency and also ensure that the inner layer of the hose has sufficient strength to resist the friction of the mineral slurry.

[0020] Preferably, the inner layer of the hose is made of ultra-high molecular weight polyethylene or nylon. Ultra-high molecular weight polyethylene has super wear resistance and self-lubrication, high strength, stable chemical properties, and strong anti-aging performance; while nylon tube has strong mechanical properties and outstanding fatigue resistance, and can maintain a certain mechanical strength after the tube is subjected to multiple dynamic loads. Both are preferred materials for the inner layer of the hose.

[0021] The beneficial effects of the present invention are as follows: the first pressure-resistant layer and the second pressure-resistant layer formed by spirally winding the first locking band and the second locking band respectively can improve the pressure resistance of the pipe in the radial direction, and at the same time make the pipe have a certain flexibility; the first tensile layer and the second tensile layer formed by spirally winding the first steel band and the second steel band can improve the tensile resistance of the pipe in the axial direction; through the combination of the pressure-resistant layer and the tensile layer, the pipe has stronger mechanical properties and flexibility, and reduces the risk of leakage caused by breakage or crushing of the pipe in the deep sea; an identification band is arranged on the outside of the protective outer layer of the pipe, which is convenient for the staff to quickly locate to any position of the pipe, or to detect the torsion of the pipe from a distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic cross-sectional view of a composite flexible hose for deep-sea mining;

[0023] Figure 2 It is a schematic longitudinal section of a composite flexible hose for deep sea mining;

[0024] Figure 3 is a schematic cross-sectional view of a first locking band;

[0025] Figure 4 is a schematic cross-sectional view of the second locking band;

[0026] Figure 5 is a schematic diagram of the structure of the marking tape in Example 3;

[0027] Figure 6 It is a schematic diagram of the structure of the marking belt in Example 4.

[0028] In the attached drawings: 1-inner layer of hose; 2-pressure-resistant layer; 201-first locking tape; 2011-first hook locking part; 2012-second hook locking part; 202-second locking tape; 2021-slot; 3-tensile layer; 301-first steel tape; 302-second steel tape; 4-protective outer layer; 5-sealing layer; 6-first wear-resistant layer; 7-second wear-resistant layer; 8-identification tape. DETAILED DESCRIPTION

[0029] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0030] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, they are 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. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0032] Example 1

[0033] Combination Figures 1 to 4A composite flexible hose for deep-sea mining is shown, which comprises a hose inner layer 1, a pressure-resistant layer 2, a tensile layer 3 and a protective outer layer 4 arranged in sequence from the inside to the outside; the pressure-resistant layer 2 comprises a first pressure-resistant layer and a second pressure-resistant layer, the first pressure-resistant layer is formed by a first locking belt 201 forming an angle of 50° to 89° with the axis of the hose inner layer 1 and spirally wound along the axis of the hose inner layer 1, and the second pressure-resistant layer is formed by a second locking belt 202 forming an angle of 50° to 89° with the axis of the hose inner layer 1 and spirally wound along the axis of the hose inner layer 1, and the second locking belt 202 has the same spiral direction as the first locking belt 201. Each winding of the first locking belt 201 forms a winding circle, and two adjacent winding circles formed by the winding of the first locking belt 201 are connected by the second locking belt 202; the tensile layer 3 comprises a first tensile layer, and the first tensile layer is formed by a plurality of first steel belts 301 arranged in parallel on the same horizontal plane and forming an angle of 15° to 45° with the axis of the hose inner layer 1 and spirally wound along the axis of the hose inner layer 1. It can be understood that being arranged side by side on the same horizontal plane refers to a state in which the layers are in contact with each other on the same horizontal plane and extend along the same straight line direction in an initial state. It should be noted that the pressure-resistant layer 2 can be provided in multiple layers.

[0034] Specifically, the cross-sectional shapes of the first locking band 201 and the second locking band 202 are both C-shaped. The first locking band 201 has a first hook lock portion 2011 and a second hook lock portion 2012 protruding on the side away from the hose inner layer 1. The second locking band 202 is provided with a clamping groove 2021. The adjacent second hook lock portions 2012 and the first hook lock portions 2011 in the winding circle formed by the first locking band 201 are clamped with the clamping groove 2021, so that the winding circle formed by the first locking band 201 is sequentially connected in the axial direction of the hose inner layer 1. The winding circle formed by the first locking band 201 can rotate with the second locking band 202 as a fulcrum, and the second locking band 202 can rotate with the first hook lock portion 2011 or the second hook lock portion 2012 as a fulcrum. The rotational motion of the first locking band 201 and the second locking band 202 accumulates to form a large degree of bending of the pipe in the axial direction, thereby avoiding the external load from being concentrated at the same position on the pipe, thereby reducing the risk of pipe fatigue.

[0035] Furthermore, the width of the slot 2021 is greater than the sum of the width of the first hook locking portion 2011 and the width of the second hook locking portion 2012. It can be understood that the two adjacent winding circles formed by the first locking band 201 can move relative to each other in the slot along the axial direction of the winding circle, thereby improving the flexibility of the pipe and further dispersing the dynamic load.

[0036] Specifically, the radial thickness of the pressure-resistant layer 2 is 3 mm to ensure that the compressive strength of the pipe meets the requirements for use in deep-sea environments; the inner diameter of the hose inner layer 1 is 110 mm and its radial thickness is 3 mm, which ensures the pipe transportation efficiency while also ensuring that the hose inner layer 1 has sufficient strength to resist the friction of mineral slurry.

[0037] Specifically, the hose inner layer 1 is made of ultra-high molecular weight polyethylene. Ultra-high molecular weight polyethylene has super wear resistance and self-lubricating properties, high strength, stable chemical properties, and strong anti-aging performance, and is a preferred material for the hose inner layer.

[0038] Specifically, the angles between the first locking band 201 and the second locking band 202 and the axis of the hose inner layer 1 are both 88°. At this angle, the first locking band 201 and the second locking band 202 can be spirally wound along the axis of the hose inner layer 1, and the radial compressive strength of the first and second pressure-resistant layers formed by such winding is relatively strong, and the flexibility of the pipe is also relatively high.

[0039] Furthermore, the tensile layer 3 also includes a second tensile layer, which is formed by a plurality of second steel strips 302 arranged in parallel on the same horizontal plane, forming an angle of 15° to 45° with the axis of the hose inner layer 1 and spirally wound outside the first tensile layer along the axis of the hose inner layer 1. The second steel strip 302 has an opposite spiral direction to the first steel strip 301. It can be understood that the second steel strip 302 and the first steel strip 301 intersect with each other. Adding such a second tensile layer can further improve the tensile resistance of the pipe in the axial direction, and at the same time further improve the strength of the pipe. It should be noted that the tensile layer 3 can also be provided with multiple layers.

[0040] Specifically, the angles between the first steel strip 301 and the second steel strip 302 and the axis of the hose inner layer 1 are both 35°. Within this angle range, the first steel strip 301 and the second steel strip 302 can not only be spirally wound along the axis of the hose inner layer 1, but also enable the pipe to maintain a relatively large axial tensile strength.

[0041] Specifically, the cross-sectional shape of the first steel strip 301 and the second steel strip 302 is a rectangle. The rectangular first steel strip 301 and the second steel strip 302 have a greater utilization rate of the layer space than the circular one, so the strength of the formed tensile layer 3 is also higher.

[0042] The working principle or workflow of this embodiment: the first pressure-resistant layer and the second pressure-resistant layer formed by the first locking band 201 and the second locking band 202 respectively winding can improve the radial pressure resistance of the pipe, thereby reducing the risk of the pipe being compressed to blockage or crushed; and the first tensile layer formed by the multiple first steel bands 301 spirally winding along the axial direction of the hose inner layer 1 can improve the axial tensile resistance of the pipe, so that the pipe is not easily broken under the deep sea pressure and its own gravity. Since the first locking band 201, the second locking band 202, the first steel band 301 and the second steel band 302 all form a certain angle with the axis of the hose inner layer 1, the pipe has a certain flexibility. When the pipe is subjected to the impact of water flow or other large dynamic loads, it can use its own flexibility to bend to a certain extent, thereby dispersing the load and avoiding the load concentration in the local position of the pipe, thereby improving the fatigue resistance of the pipe and not easily causing fatigue. The combination of the pressure-resistant layer 2 and the tensile layer 3 can improve the reliability of the pipe in deep sea environment.

[0043] The beneficial effects of this embodiment are as follows: the first pressure-resistant layer and the second pressure-resistant layer formed by spirally winding the first locking band and the second locking band respectively can improve the pressure resistance of the pipe in the radial direction, and at the same time make the pipe have a certain flexibility; the first tensile layer and the second tensile layer formed by spirally winding the first steel band and the second steel band can improve the tensile resistance of the pipe in the axial direction; through the combination of the pressure-resistant layer and the tensile layer, the pipe has stronger mechanical properties and flexibility, reducing the risk of leakage caused by breakage or crushing of the pipe in the deep sea.

[0044] Example 2

[0045] This embodiment is based on the embodiment 1. Figure 1 and Figure 2 As shown, a first wear-resistant layer 6 is provided between the anti-compression layer 2 and the anti-tensile layer 3, and a second wear-resistant layer 7 is provided between the anti-tensile layer 3 and the protective outer layer 4. The pipe will often swing during deep-sea use, resulting in friction between the anti-compression layer 2 and the anti-tensile layer 3 and layer wear. Therefore, the first wear-resistant layer 6 is provided to separate the anti-compression layer 2 from the anti-tensile layer 3, thereby reducing the friction and wear between the anti-compression layer 2 and the anti-tensile layer 3, so as to extend the service life of the anti-compression layer 2 and the anti-tensile layer 3; and the second wear-resistant layer 7 can prevent the protective outer layer 4 from directly contacting the anti-tensile layer 3, thereby reducing the friction and wear caused by the anti-tensile layer 3 to the protective outer layer 4, reducing the risk of damage or cracking of the protective outer layer 4, and thus extending the service life of the entire pipe.

[0046] Specifically, the first wear-resistant layer 6 and the second wear-resistant layer 7 are both formed by spirally winding four layers of a polyester tape that forms an angle with the axial direction of the hose inner layer 1 along the axial direction of the hose inner layer 1. The first wear-resistant layer 6 and the second wear-resistant layer 7 formed by spirally winding the polyester tape have high strength and good wear resistance and water resistance. The first wear-resistant layer 6 and the second wear-resistant layer 7 can also be formed by winding a fiber tape.

[0047] Furthermore, a sealing layer 5 is provided between the hose inner layer 1 and the pressure-resistant layer 2. The sealing layer 5 can separate the hose inner layer 1 from the pressure-resistant layer 2, thereby preventing the pressure-resistant layer 2 from directly contacting the hose inner layer 1 and causing wear to the hose inner layer 1, thereby preventing the corrosive medium from leaking through the hose inner layer 1 to the pressure-resistant layer 2 and causing corrosion to the pressure-resistant layer 2, thereby extending the service life of the pipe material, so that the pipe material can be used for a long time in a deep sea environment.

[0048] Specifically, the sealing layer 5 is made of high-density polyethylene material. High-density polyethylene has good rigidity and toughness, high corrosion resistance, and low permeability to the medium, and is a preferred material for the sealing layer 5.

[0049] The other features, working principles and beneficial effects of this embodiment are consistent with those of Embodiment 1.

[0050] Example 3

[0051] This embodiment is based on the embodiment 2, combined with Figure 1 and Figure 5 As shown, two marking strips 8 are provided on the side wall of the protective outer layer 4 away from the hose inner layer 1. Specifically, the marking strips 8 include a plurality of length markings spaced apart along the length direction of the pipe. When an abnormality occurs in the pipe, the staff can quickly locate the abnormal position on the pipe according to the length markings, which is beneficial to the inspection and maintenance of the pipe.

[0052] The other features, working principles and beneficial effects of this embodiment are consistent with those of Embodiment 2.

[0053] Example 4

[0054] This embodiment is based on the embodiment 2, combined with Figure 1 and Figure 6 As shown, two identification bands 8 are provided on the side wall of the protective outer layer 4 away from the hose inner layer 1. Specifically, the identification band 8 includes a color band whose color is obviously different from that of the protective outer layer 4, and the color band extends along the axial direction of the sheath layer 4. The staff can judge the degree of torsion of the pipe from a distance according to the deformation of the color band, thereby judging whether the pipe is scrapped.

[0055] The other features, working principles and beneficial effects of this embodiment are consistent with those of Embodiment 2.

[0056] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A composite flexible hose for deep sea mining, characterized in that: The invention comprises a hose inner layer (1), a pressure-resistant layer (2), a tensile layer (3) and a protective outer layer (4) which are arranged in sequence from the inside to the outside; the pressure-resistant layer (2) comprises a first pressure-resistant layer and a second pressure-resistant layer, the first pressure-resistant layer is formed by a first locking belt (201) which forms an angle of 50° to 89° with the axis of the hose inner layer (1) and is spirally wound along the axis of the hose inner layer (1); the second pressure-resistant layer is formed by a second locking belt (202) which forms an angle of 50° to 89° with the axis of the hose inner layer (1) and is spirally wound along the axis of the hose inner layer (1); two adjacent winding circles formed by the first locking belt (201) are connected by the second locking belt (202); the tensile layer (3) comprises a first tensile layer, the first tensile layer is formed by a plurality of first steel belts (301) arranged in parallel on the same horizontal plane, which form an angle of 15° to 45° with the axis of the hose inner layer (1) and are spirally wound along the axis of the hose inner layer (1).

2. A composite flexible hose for deep sea mining according to claim 1, characterized in that: A first hook lock portion (2011) and a second hook lock portion (2012) are protruded on a side of the first locking tape (201) away from the inner layer (1) of the hose, and a clamping groove (2021) is provided on the second locking tape (202), and the adjacent second hook lock portion (2012) and first hook lock portion (2011) in the winding circle formed by winding the first locking tape (201) are both clamped with the clamping groove (2021).

3. A composite flexible hose for deep sea mining according to claim 1, characterized in that: The width of the locking slot (2021) is greater than the sum of the width of the first hook locking portion (2011) and the width of the second hook locking portion (2012).

4. A composite flexible hose for deep sea mining according to claim 1, characterized in that: The anti-tensile layer (3) further comprises a second anti-tensile layer, which is formed by a plurality of second steel strips (302) arranged in parallel on the same horizontal plane, forming an angle of 15° to 45° with the axis of the hose inner layer (1) and spirally wound around the outside of the first anti-tensile layer along the axis of the hose inner layer (1), wherein the spiral direction of the second steel strip (302) is opposite to that of the first steel strip (301).

5. A composite flexible hose for deep sea mining according to claim 4, characterized in that: The cross-sections of the first steel strip (301) and the second steel strip (302) are both rectangular.

6. A composite flexible hose for deep sea mining according to claim 1, characterized in that: A first wear-resistant layer (6) is provided between the compression-resistant layer (2) and the tensile-resistant layer (3); and a second wear-resistant layer (7) is provided between the tensile-resistant layer (3) and the protective outer layer (4).

7. A composite flexible hose for deep sea mining according to claim 6, characterized in that: The first wear-resistant layer (6) and the second wear-resistant layer (7) are both formed by spirally winding a plurality of layers of a polyester belt or a fiber belt that forms an angle with the axis of the hose inner layer (1) along the axis of the hose inner layer (1).

8. The composite flexible hose for deep sea mining according to claim 1, characterized in that: A sealing layer (5) is provided between the hose inner layer (1) and the pressure-resistant layer (2).

9. A composite flexible hose for deep sea mining according to claim 8, characterized in that: The sealing layer (5) is made of high-density polyethylene material.

10. A composite flexible hose for deep sea mining according to any one of claims 1 to 9, characterized in that: A marking band (8) is provided on a side wall of the protective outer layer (4) away from the hose inner layer (1).

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