A method for preparing a multi-core composite armored cable in a pure water environment

Abstract

The application discloses a kind of for pure water environment under the preparation method of multi-core composite armored cable, its steps include:1) preliminary airtightness detection is carried out to bellows;After detection passes, step 2) is carried out;2) bellows is unfolded and straightened, and bellows is in tight state;3) prepare threading device at the one end of bellows, and threading device is worn into bellows inside until the terminal of threading device exposes from the other end of bellows;4) each cable in the multi-core composite armored cable to be prepared is worn into bellows by a set of cable grooming device in cable grooming device track;5) each cable is inserted into a metal joint before each cable passes through cable grooming device and enters bellows, and the connection of metal joint and each cable is realized;The other end of metal joint is connected with threading device;7) threading device is pulled back, and each cable is pulled into bellows until each cable passes through bellows.The application avoids cable damage caused by cable outlet intersection, and is suitable for mass production preparation.

Description

Technical Field

[0001] This invention belongs to the field of underwater armored cable manufacturing, and relates to a method for preparing a multi-core composite armored cable for use in a pure water environment. Background Technology

[0002] Underwater multi-core composite armored cables are widely used in pure water systems in fields such as pharmaceutical processing, food engineering, cosmetics manufacturing, nuclear industry, and high-energy physics experiments. These cables consist of multiple cables of different types, encased in insulating materials and flexible metal protective layers, enabling independent and parallel transmission of various signals across different cable types. For example, the network cable in the composite cable transmits digital signals, while the coaxial cable transmits analog signals. Compared to conventional multi-core composite armored cables, multi-core armored cables used in pure water environments employ special materials and structural designs. While ensuring better waterproof and pressure-resistant performance underwater, it is also necessary to prevent the underwater multi-core composite armored cable from polluting the aquatic environment.

[0003] Composite armored waterproof cables with a 304 stainless steel corrugated pipe as the waterproof layer are a new type of highly flexible composite armored cable manufactured by embedding multiple cables into a small-diameter (inner diameter: 4mm-32mm) continuously formed corrugated pipe. A key feature of this armored cable is the narrow gap between the built-in multi-core cables and the waterproof layer, allowing for high-precision water tightness testing using airtightness testing methods, thus saving manufacturing and testing costs. However, manufacturing long-distance (up to hundreds of meters) multi-core composite waterproof armored cables is challenging. The corrugated pipe is long and has a small inner diameter; the diameters, surface finishes, and hardness of various transmission cables are often inconsistent. When multiple cables are embedded in the corrugated pipe simultaneously, they are prone to crossing (e.g., ...). Figure 1 This increases friction, causing the cable to get stuck or even be damaged. Summary of the Invention

[0004] This invention relates to a method for manufacturing a multi-core composite armored cable for use in pure water environments, aiming to solve the technical problems existing in the manufacturing of underwater multi-core composite armored cables. The underwater composite armored cable consists of multiple cables of different types (X1, X2, ..., Xn), a corrugated tube structure, and retaining rings. The cables are manufactured by processing the core wires and insulation sheath using any manufacturing process. The corrugated tube structure includes a continuously formed annular corrugated tube made of stainless steel and stainless steel flanges or joints welded at both ends. The retaining rings are made of rubber and are fixed to the cable ends with tape to prevent the cable inside the corrugated tube from being pulled out due to accidental operation during installation.

[0005] The technical solution of this invention is as follows:

[0006] A method for manufacturing a multi-core composite armored cable for use in a pure water environment, comprising the following steps:

[0007] 1) Conduct a preliminary airtightness test on the bellows 8; proceed to step 2) after the test is passed.

[0008] 2) Unfold and straighten the corrugated pipe 8 to bring it into a taut state;

[0009] 3) Prepare a threader 14 at one end of the corrugated pipe 8 and insert the threader 14 into the inside of the corrugated pipe 8 until the terminal of the threader 14 is exposed from the other end of the corrugated pipe 8.

[0010] 4) Each cable in the multi-core composite armored cable to be prepared enters the corrugated pipe 8 through a predetermined insertion trajectory in the cable combing device 16; the cable combing device 16 includes three layers of nylon plates, used to set a corresponding insertion trajectory for each cable, and the insertion trajectories of each cable do not intersect; wherein, the first layer of nylon plate 20 has n small holes evenly distributed on a circumference with a diameter of d1, the second layer of nylon plate 19 has n small holes evenly distributed on a circumference with a diameter of d2, and the third layer of nylon plate 18 has n small holes evenly distributed on a circumference with a diameter of d3; each cable passes through the first layer of nylon plate 20, the second layer of nylon plate 19, the third layer of nylon plate 18, and the fourth layer of nylon plate 19 in sequence. A small hole in the nylon plate 19 and the third nylon plate 18 enters the corrugated pipe 8, where d2 > d1 > d3 > the inner diameter d of the corrugated pipe 8. The function of the small hole on the first nylon plate 20 is to allow each cable to enter the small hole in the second nylon plate 19 at a first set angle. The function of the small hole in the second nylon plate 19 is to ensure that each cable is in a taut state when it passes through the corrugated pipe 8. The function of the small hole in the third nylon plate 18 is to allow each cable to form a second set angle between the second nylon plate 19 and the third nylon plate 18, and to maintain an angle less than the third set angle when the cable passes through the corrugated pipe 8.

[0011] 5) Before passing each cable through the cable combing device 16 and into the corrugated tube 8, insert each cable into a metal connector to connect the metal connector to each cable; the other end of the metal connector is connected to the cable threader 14.

[0012] 7) Pull the cable puller 14 back to pull each cable into the corrugated tube 8 until each cable passes through the corrugated tube 8.

[0013] Furthermore, d1 is 5 to 6 times the inner diameter of the bellows 8; d2 is 6 to 10 times the inner diameter of the bellows 8; and d3 is 1.8 to 3 times the inner diameter of the bellows 8.

[0014] Furthermore, the holes on the first layer of nylon plate 20 have rounded corners to prevent the cable from being scratched when passing through the holes; each hole on the second layer of nylon plate 19 is provided with a spring clamp to provide a certain frictional resistance to the cable when it passes through.

[0015] Furthermore, the spring clamp includes a roller 22, a bracket 23, a spring 24, and a pressure plate 26; wherein, the front end of the bracket 23 is provided with the roller 22, the rear end of the bracket 23 is provided with a connecting rod, the pressure plate is provided with a hole for matching and connecting with the connecting rod, the connecting rod is fitted with the spring 24, and the roller 22 is used to contact the cable passing through the small hole on the second layer of nylon plate 19 to provide a certain frictional resistance for the cable.

[0016] Furthermore, the first set angle is 10-20 degrees; the second set angle is 10-20 degrees; and the third set angle is 5 degrees.

[0017] Furthermore, each cable is inserted into a metal connector, and the metal connector undergoes radial plastic deformation to compress each cable, thereby achieving the connection between the metal connector and each cable.

[0018] Furthermore, the retaining ring 6 is fixed to each cable to prevent the cables from retracting into the corrugated pipe 8.

[0019] Furthermore, the metal connector is provided with a hook 27; the front end of the threader 14 is a bullet-shaped metal structure with a connection hole for matching and connecting with the hook 27, thereby realizing the connection between the metal connector and the threader 14.

[0020] Furthermore, in step 1), the corrugated pipe 8 is first subjected to overall solution treatment, and then the corrugated pipe 8 is subjected to preliminary airtightness testing.

[0021] Furthermore, a flange 7 is first installed at each end of the bellows 8, and then the flange 7 is connected to the airtightness testing equipment to perform a preliminary airtightness test on the bellows 8.

[0022] The armored cable manufacturing method of the present invention includes the following steps:

[0023] (1) After the bellows 8 is manufactured, flanges 7 are welded to both ends of it;

[0024] (2) The corrugated pipe 8 is subjected to overall solution treatment to remove the oxide color from the surface of the corrugated pipe and weld, making the corrugated pipe softer and giving it a bright silver-white appearance. This helps to improve the corrosion resistance of the corrugated pipe and weld in water.

[0025] (3) Connect the flange structure of the bellows to the air tightness testing equipment (such as a helium mass spectrometer), and fix its two ends to the two ends of the platform to achieve preliminary air tightness testing;

[0026] (4) The corrugated pipe 8 is unfolded and straightened on a platform by the straightening machine 11, and its two ends are fixed to the two ends of the platform so that the corrugated pipe is in a taut state.

[0027] (5) Prepare a threader 14 at one end of the corrugated pipe 8 and insert the threader 14 into the inside of the corrugated pipe 8 until the terminal of the threader 14 protrudes from the other end of the corrugated pipe. Preferably, the front end of the threader 14 is a bullet-shaped metal structure with a connection hole. The thread of the threader 14 should have both strength and toughness and avoid scratching the inner wall of the corrugated pipe (e.g., internal steel wire, external rubber coating). The diameter of the metal structure and the thread should be at least 4 mm smaller than the inner diameter of the corrugated pipe 8.

[0028] (6) Each cable is passed through the cable combing device 16 along a specific trajectory. The cable combing device 16 mainly consists of three layers of nylon plates. The first layer of nylon plate 20 has n small holes, each of which is evenly distributed on a circumference with a diameter of d1. The diameter of d1 is between 5 and 6 times the inner diameter of the corrugated pipe. The small holes have rounded corners to prevent the cables from being scratched when passing through the small holes. The second layer of nylon plate 19 has n small holes, each of which is evenly distributed on a circumference with a diameter of d2. The diameter of d2 is between 6 and 10 times the inner diameter of the corrugated pipe. Each small hole has a spring clamp to provide a certain frictional resistance for each cable when it passes through. The third layer of nylon plate 18 also has n small holes, each of which is evenly distributed on a circumference with a diameter of d3. The diameter of d3 is between 1.8 and 3 times the inner diameter of the corrugated pipe. The small holes on the first nylon plate 20 allow the cable to enter the small holes on the second nylon plate 19 at an angle of 10-20 degrees. The small holes on the second nylon plate 19 utilize the friction provided by the spring clamps to keep each cable taut as it passes through the corrugated tube. The small holes on the third nylon plate 18 ensure that each cable forms an angle of 10-20 degrees between the second and third nylon plates 19 and 18, and that the cable enters the corrugated tube at an angle of less than 5 degrees, minimizing the risk of cable overlap during insertion and thus reducing pulling resistance.

[0029] (7) After each network cable passes through the cable combing device 16, before entering the corrugated pipe 8, all cables are inserted into a metal connector. The device is used to make the metal connector undergo radial plastic deformation to compress the cable and achieve a tight connection between the metal connector and the cable. Preferably, the front end of the bullet-shaped metal connector is a hook 27.

[0030] (8) Use a steel wire rope to connect the bullet head structure at the end of the threader 14 to the metal connector. When fixing, prevent the steel wire rope from falling off.

[0031] (9) Pull the cable threader 14 back using the traction machine 12 to pull the cable into the corrugated pipe 8 until the cable is completely passed through the corrugated pipe 8. Preferably, the cable tension should be as small as possible, and the cable laying device should have an active laying function. Once the cable is under tension, the laying device actively feeds the cable to achieve a smaller tension.

[0032] (10) Secure the retainer 6 to the cable to prevent the cable from retracting into the corrugated tube during winding or subsequent installation.

[0033] This invention relates to a method for preparing a multi-core composite armored cable for use in a pure water environment. The beneficial effects of this invention are:

[0034] (1) When multiple cables are simultaneously embedded in a small-diameter corrugated pipe of more than 100 meters, the friction caused by the cross of the cables is avoided, which would lead to cable damage. This has enabled the preparation of small-diameter, long-distance composite armored cables of more than 100 meters.

[0035] (2) The preparation method of the underwater composite armored cable is simple and efficient, and is suitable for mass production. Attached Figure Description

[0036] Figure 1 This is a schematic diagram showing how cables cross inside a corrugated pipe.

[0037] Figure 2 This is an embodiment of a multi-core composite armored cable for use in pure water environments.

[0038] Figure 3 This is a cross-sectional diagram of a multi-core composite armored cable used in pure water environments.

[0039] Figure 4 This is a schematic diagram illustrating the manufacturing process of waterproof armored cables.

[0040] Figure 5 It is a cable combing device used in the manufacture of multi-core composite armored cables.

[0041] Figure 6 It is a spring clamp for the second layer of nylon sheet.

[0042] Figure 7 A schematic diagram of a structural embodiment of a metal connector used to manufacture a waterproof armored cable.

[0043] In the diagram: 1-First eight-core digital cable, 2-Second eight-core digital cable, 3-First power line, 4-Second power line, 5-Tape, 6-Snap ring, 7-Flange, 8-Corrugated pipe, 9-Gap, 10-Cable reel, 11-Straightening machine, 12-Traction machine, 13-Platform, 14-Threading device, 15-Traction line, 16-Cable combing device, 17-Cable reel, 18-Third nylon sheet, 19-Second nylon sheet, 20-First nylon sheet, 21-Small hole, 22-Roller, 23-Bracket, 24-Spring, 25-Screw, 26-Pressure plate, 27-Hook. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] by Figure 2 A multi-core composite armored cable is demonstrated, its main structure consisting of four cables, a continuously formed stainless steel corrugated tube, a stainless steel flange, and a retaining ring. The four cables (e.g., Figure 3 The system comprises two types of 8-core digital cables and two types of coaxial cables, with gaps between each cable and the corrugated tube to facilitate gas flow during airtightness testing. Flanges are located at both ends of the corrugated tube and are used to connect the airtightness testing equipment. Rubber retaining rings are fixed to both ends of the cables to prevent accidental retraction of one end of the cable back into the corrugated tube during installation. The following is a specific embodiment of this preparation method:

[0046] (1) After the corrugated pipe 8 is manufactured, stainless steel flanges 7 are welded to both ends of it.

[0047] (2) The corrugated pipe 8 is subjected to overall solution treatment to remove the oxide color from the surface of the corrugated pipe and weld, making the corrugated pipe softer and giving it a bright silver-white appearance. This helps to improve the corrosion resistance of the corrugated pipe and weld in water.

[0048] (3) Connect the flange structure of the bellows 8 to the air tightness testing equipment (such as a helium mass spectrometer), and fix its two ends to the two ends of the platform to achieve preliminary air tightness testing;

[0049] (4) The corrugated pipe 8 is unfolded and straightened on a platform using a straightening machine 11, with both ends fixed to the platform by the straightening machine, so that the corrugated pipe 8 is in a taut state (e.g., Figure 4 a);

[0050] (5) Prepare a threader at one end of the corrugated pipe and insert the threader into the corrugated pipe until the terminal of the threader protrudes from the other end of the corrugated pipe. Preferably, the front end of the threader is a bullet-shaped metal structure with a connection hole. The threader's wire should have both strength and toughness, and avoid scratching the inner wall of the corrugated pipe (e.g., internal steel wire, external rubber coating). The diameter of the metal structure and the wire should be at least 4 mm smaller than the inner diameter of the corrugated pipe.

[0051] (6) Pass each cable through the cable combing device 16 (e.g., ...) along a specific trajectory. Figure 5 The device mainly consists of a three-layer nylon plate structure. The first layer, nylon plate 20, has n small holes, each evenly distributed on a circumference with a diameter of d1, where d1 is 5-6 times the inner diameter of the corrugated pipe. These holes have rounded corners to prevent the cable from being scratched when passing through them. The second layer, nylon plate 19, also has n small holes, each evenly distributed on a circumference with a diameter of d2, where d2 is 6-10 times the inner diameter of the corrugated pipe. Each hole has a spring clamp to provide frictional resistance to each cable as it passes through. The spring clamps of the second layer, nylon plate 19, are as follows: Figure 6 As shown, the spring clamp mainly consists of a roller, a bracket, a spring, a pressure plate, and screws. When the cable passes through the small hole on the underside of the roller, under the action of the spring, the cable is subjected to pressure and friction from the combined action of the roller and the small hole. The spring clamp includes a roller 22, a bracket 23, a spring 24, and a pressure plate 26. The front end of the bracket 23 is provided with the roller 22, and the rear end of the bracket 23 is provided with a connecting rod. The pressure plate has a hole for matching and connecting with the connecting rod. The connecting rod is fitted with the spring 24. The roller 22 is used to contact the cable passing through the small hole on the second layer nylon plate 19, providing a certain frictional resistance to the cable. The pressure plate 26 is fixed to the second layer nylon plate 19 by screws 25. The third layer nylon plate 18 has n small holes, which are evenly distributed on a circumference with a diameter of d3, and the diameter of d3 is between 1.8 and 3 times the inner diameter of the corrugated pipe.

[0052] The small holes on the first nylon plate 20 are used to allow the cable to enter the small holes on the second nylon plate 19 at an angle of 10-20 degrees. The small holes on the second nylon plate 19 are used to utilize the friction provided by the spring clamps to keep each cable taut when it enters the corrugated tube. The small holes on the third nylon plate 18 are used to ensure that each cable forms an angle of 10-20 degrees between the second nylon plate 19 and the third nylon plate 18, and to maintain an angle of less than 5 degrees when the cable enters the corrugated tube 8, so as to minimize the overlap of the cable during the embedding process and avoid excessive resistance to pulling the cable.

[0053] (7) After each network cable passes through the cable combing device 16 and before entering the corrugated tube 8, insert all the cables into a metal connector. Use the device to cause the metal connector to undergo radial plastic deformation, thus compressing the cables (e.g., Figure 7 This allows for a tight connection between the metal connector and each cable; preferably, the bullet-shaped metal connector has a hook 27 at its front end.

[0054] (8) Use a steel wire rope to connect the bullet head structure at the end of the threader 14 to the metal connector. When fixing, prevent the steel wire rope from falling off.

[0055] (9) The traction wire of the cable threader 14 is pulled back by the traction machine 12, so that the cable is pulled into the corrugated pipe until the cable is completely passed through the corrugated pipe. Preferably, the cable tension should be as small as possible, and the cable laying device should have an active laying function. Once the cable is under tension, the laying device actively feeds the cable to achieve a smaller tension.

[0056] (10) Secure the retaining ring 6 to the cable to prevent the cable from retracting back into the corrugated tube 8 during winding or subsequent installation.

[0057] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for manufacturing a multi-core composite armored cable for use in a pure water environment, comprising the following steps: 1) Conduct a preliminary airtightness test on the bellows (8); After the test is passed, proceed to step 2). 2) Unfold and straighten the corrugated pipe (8) to make the corrugated pipe (8) taut; 3) Prepare a threader (14) at one end of the corrugated pipe (8) and insert the threader (14) into the corrugated pipe (8) until the terminal of the threader (14) is exposed from the other end of the corrugated pipe (8); 4) Each cable in the multi-core composite armored cable to be prepared is inserted into the corrugated pipe (8) through a set insertion trajectory in the cable combing device (16); the cable combing device (16) includes three layers of nylon plates, which are used to set a corresponding insertion trajectory for each cable, and the insertion trajectories of each cable do not intersect; wherein, the first layer of nylon plate (20) has n small holes evenly distributed on a circumference with a diameter of d1, the second layer of nylon plate (19) has n small holes evenly distributed on a circumference with a diameter of d2, and the third layer of nylon plate (18) has n small holes evenly distributed on a circumference with a diameter of d3; each The cables sequentially pass through a small hole in the first nylon plate (20), the second nylon plate (19), and the third nylon plate (18) into the corrugated pipe (8), where d2 > d1 > d3 > the inner diameter d of the corrugated pipe (8). The function of the small hole in the first nylon plate (20) is to allow each cable to enter the small hole in the second nylon plate (19) at a first set angle. The function of the small hole in the second nylon plate (19) is to ensure that each cable is in a taut state when it passes through the corrugated pipe (8). The function of the small hole in the third nylon plate (18) is to allow each cable to pass through the second nylon plate (19) and the third nylon plate (18) in a taut state. 8) A second set angle is formed between them, and when the cable passes through the corrugated pipe (8), it can maintain an angle less than the third set angle when entering the corrugated pipe (8); wherein, d1 is 5 to 6 times the inner diameter of the corrugated pipe (8); d2 is 6 to 10 times the inner diameter of the corrugated pipe (8); d3 is 1.8 to 3 times the inner diameter of the corrugated pipe (8); the small holes on the first layer of nylon plate (20) have rounded corners to prevent the cable from being scratched when passing through the small holes; each small hole on the second layer of nylon plate (19) is provided with a spring clamp to provide a certain frictional resistance to the cable when it passes through; the spring clamp includes The system includes a roller (22), a bracket (23), a spring (24), and a pressure plate (26); the front end of the bracket (23) is provided with the roller (22), the rear end of the bracket (23) is provided with a connecting rod, the pressure plate (26) is provided with a hole for matching and connecting with the connecting rod, the connecting rod is fitted with the spring (24), and the roller (22) is used to contact the cable passing through the small hole on the second layer of nylon plate (19) to provide a certain frictional resistance for the cable; the first set angle is 10-20 degrees; the second set angle is 10-20 degrees; and the third set angle is 5 degrees. 5) Before passing each cable through the cable combing device (16) and into the corrugated tube (8), insert each cable into a metal connector to connect the metal connector with each cable; the other end of the metal connector is connected to the cable threader (14); 6) Pull the cable puller (14) back to pull each cable into the corrugated tube (8) until each cable passes through the corrugated tube (8).

2. The method of claim 1, wherein, Each cable is inserted into a metal connector, and the metal connector is plastically deformed in the radial direction to compress each cable, thereby connecting the metal connector and each cable.

3. The method of claim 1, wherein, The retaining ring (6) is fixed on each cable to prevent each cable from retracting into the corrugated tube (8).

4. The method of claim 1, wherein, The metal connector is provided with a hook (27); the front end of the threader (14) is a bullet-shaped metal structure with a connection hole for matching and connecting with the hook (27) to realize the connection between the metal connector and the threader (14).

5. The method of claim 1, wherein, In step 1), the corrugated pipe (8) is first subjected to overall solution treatment, and then the corrugated pipe (8) is subjected to preliminary airtightness test.

6. The method of claim 5, wherein, First, a flange (7) is installed at each end of the bellows (8), and then the flange (7) is connected to the air tightness testing equipment to perform a preliminary air tightness test on the bellows (8).

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