Cable splicing device

Abstract

This invention relates to a cable splicing device, belonging to the field of cable connection. It includes a first splicing shell, a second splicing shell, and a first insert and a second insert connected inside the first and second splicing shells. The first insert connects to the second insert, and the first insert is fixed via a mounting flange and a first adjusting flange. The second insert is fixed via a second adjusting flange and a mounting base. The tails of the first and second inserts are connected to pigtails. The first insert, the connector connected to the first insert, the second insert, and the connector connected to the second insert are all housed within the cavity connecting the first and second splicing shells. The tails of the first and second splicing shells are connected to a locking mechanism. This invention solves the problem of difficult underwater cable connections and offers the following advantages: it meets the requirements of complex aquatic environments; the internal structure of the cable splicing device is novel, enabling multiple watertight protections; redundant safety design improves construction reliability; and the locking mechanism ensures the sealing performance in the underwater environment.

Description

Technical Field

[0001] The invention belongs to the field of underwater cable connection, and in particular relates to a cable splicing device. Background Art

[0002] The present invention relates to the field of marine construction and shallow sea and deep sea submarine tunnel construction projects.

[0003] Underwater cables are one of the important components of the immersed tube method for building submarine tunnels. They are the channels for controlling the ballast pumps, drive motors, cameras, lighting, and measurement and control equipment inside the immersed tubes. They provide power and communication functions for various equipment and instruments inside the immersed tubes. When the cables are cut at the construction site, it is necessary to splice the cut cables. Safety and reliability after splicing are also one of the key technologies in the immersed tube installation process.

[0004] An existing cable splicing technology generally adopts connector technology, and reliability is guaranteed by underwater connectors. The specific implementation is to connect the cable and the tail of the connector together, and complete the line splicing through the docking and matching of the connector; the disadvantages of this existing technology: 1. The underwater connector of this technology is expensive, and the long-term construction reliability is affected by complex water quality, and the maintenance cost is high; 2. If the cable has high voltage or current load requirements, the cost of the connector in terms of appearance size and safety performance will be greatly increased, and even similar products cannot be found; 3. If large-diameter size and composite cables (photoelectric liquid and gas cables) are used on the construction site, the cost of the connector will increase significantly; 4. The load-bearing capacity of the tail of the connector is limited by the product selection of its manufacturer; Another existing technology is direct cable splicing vulcanization treatment, and the disadvantages of this existing technology: 1. There is a great risk in the safety of direct cable splicing offshore construction; 2. The load-bearing capacity of the direct cable splicing is weakened. Summary of the invention

[0005] In view of the above-mentioned technical problems that the use of underwater connectors for connection is expensive, the long-term construction reliability is greatly affected by complex water quality, and the maintenance cost is high, the present invention provides a cable splicing device that can meet the application in complex water environments, has a novel internal structure design, can achieve multiple watertight protections, and has a redundant safety design, thereby improving construction reliability.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A cable splicing device comprises a first splicing shell, a second splicing shell, and a first plug-in and a second plug-in connected inside the first splicing shell and the second splicing shell, wherein the first plug-in is connected to the second plug-in, the first plug-in is connected and fixed by a mounting flange and a first adjustment flange, the second plug-in is connected and fixed by a second adjustment flange and a mounting base, the tails of the first plug-in and the second plug-in are connected to pigtails, the first plug-in, the mounting flange, the adjustment flange, the pigtail connected to the first plug-in, the second plug-in, the second adjustment flange, the mounting base and the pigtail connected to the second plug-in are all arranged in a cavity connected to the first splicing shell and the second splicing shell, and the tails of the first splicing shell and the second splicing shell are connected to a locking mechanism.

[0008] Preferably, the locking mechanism includes a locking nut connected to the tail of the first lap shell and the second lap shell, a pressure rod is provided on the outer wall of the locking nut, and the tail of the first lap shell and the second lap shell are provided with a stop block for preventing the cable from radially rotating in the first lap shell and the second lap shell, and a nut for limiting axial movement is provided on the outside of the stop block, and the locking nut, pressure rod and stop block are all fastened by the nut, the first lap shell, the second lap shell, the locking nut and the pressure rod work together to form an internal load-bearing layer, and the first lap shell, the second lap shell, the stop block and the nut together constitute an external load-bearing layer.

[0009] Preferably, the inner circumferential walls of the locking nut and the pressure rod are provided with rectangular spiral lines, the rectangular spiral lines are clearance-matched, the spiral grooves at the bottom of the rectangular spiral lines pass through and accommodate the load-bearing structure inside the cable, and there are retaining springs on the outer walls around the locking nut.

[0010] Preferably, the inner wall of the stop block is provided with a plurality of rectangular grooves, and the outer wall of the stop block is provided with a wedge-shaped structure for increasing the friction with the cable, which can prevent the radial rotation of the cable in the first overlapping shell and the second overlapping shell, thereby increasing the contact friction between the stop block and the cable.

[0011] Preferably, the mounting flange is connected to the inside of the first lap shell by pins, the first adjustment flange is connected to the mounting flange, a sealing ring is provided between the mounting flange and the first adjustment flange, and the first adjustment flange is used to adjust the axial height of the first plug-in.

[0012] Preferably, the first plug-in and the second plug-in are provided with positioning holes, the first adjustment flange and the second adjustment flange are provided with positioning pins, the first plug-in is connected to the first adjustment flange through the positioning hole and the positioning pin, and the second adjustment flange and the second plug-in are connected through the positioning hole and the positioning pin.

[0013] Preferably, the first plug-in and the second plug-in are provided with guide mechanisms, wherein the guide mechanism of one plug-in is provided with an inserting groove, and the guide mechanism of the other plug-in is provided with an inserting convex groove.

[0014] Preferably, the connection between the tail of the first overlapping shell and the second overlapping shell and the locking nut is filled with resin for sealing.

[0015] Preferably, the tail extension portions of the first overlapping shell and the second overlapping shell are provided with bending limiting protective sleeves.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are:

[0017] 1. The present invention provides a cable splicing device, wherein a first plug-in, a mounting flange connected to the first plug-in, an adjusting flange, a pigtail, a second plug-in, a second adjusting flange connected to the second plug-in, a mounting base and a pigtail are all arranged in a cavity connected by a first splicing shell and a second splicing shell. The splicing technology device provided by the connection technology meets the requirements of complex water environment applications; the internal structure design of the cable splicing device is novel, and multiple watertight protections can be achieved. The redundant safety design improves the construction reliability, and the locking mechanism ensures the sealing of the underwater environment;

[0018] 2. There are rectangular spiral lines on the inner circumferential walls of the locking nut and the pressure rod. The rectangular spiral lines are clearance-matched. The bottom of the spiral groove of the rectangular spiral line passes through and receives the load-bearing structural parts inside the cable. The cable splicing device can bear a large external load, and the load-bearing performance can reach more than 95% of the cable's own breakage;

[0019] 3. There are multiple rectangular grooves on the inner wall of the stop block, and the outer wall of the stop block is a wedge-shaped structure, which can prevent the radial rotation of the cable in the first overlap shell and the second overlap shell, and increase the contact friction between the stop block and the cable;

[0020] 4. Stop blocks are provided at the tail of the first lap shell and the second lap shell, and nuts for limiting axial movement are provided on the outside of the stop blocks. The locking nut, pressure rod and stop blocks are all fastened by the nuts, and the stop blocks provided inside achieve a limiting effect, can withstand the impact of ocean currents, and have anti-twisting and anti-fatigue properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the internal structure diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0023] In the above figures: 1. first lap shell, 2. mounting flange, 3. first adjustment flange, 4. first plug-in, 5. second plug-in, 6. first lap shell, 7. second adjustment flange, 8. mounting base, 9. pigtail, 12. locking nut, 13. pressure rod, 12. filling resin, 14. stop block, 15. nut, 16. bend limiter, 19. cable. DETAILED DESCRIPTION

[0024] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description.

[0025] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “inside”, “outside”, “upper”, “lower”, “front” and “back” are based on the positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0026] like Figure 1-2 As shown, it includes a first overlap shell 1, a second overlap shell 6, and a first plug-in 4 and a second plug-in 5 connected inside the first overlap shell 1 and the second overlap shell 6, the first plug-in 4 is connected to the second plug-in 5, the first plug-in 4 is connected and fixed by a mounting flange 2 and a first adjustment flange 3, the second plug-in 5 is connected and fixed by a second adjustment flange 7 and a mounting base 8, the first plug-in 4 and the second plug-in 5 are connected to a pigtail 9 at the tail end, the first plug-in 4, the mounting flange 2, the adjustment flange 3, the pigtail 9, the second plug-in 5, and the second adjustment flange 7, the mounting base 8 and the pigtail 9 connected to the second plug-in 5 are all arranged in a cavity connected by the first overlap shell 1 and the second overlap shell 6, and the tail end of the first overlap shell 1 and the second overlap shell 6 is connected to a locking mechanism.

[0027] Among them, the locking mechanism includes a locking nut 12 connected to the tail of the first lap shell 1 and the second lap shell 6, the outer wall of the locking nut 12 is provided with a pressure rod 13, the tail of the first lap shell 1 and the second lap shell 6 is provided with a stop block 14 for preventing the cable 19 from radially rotating in the first lap shell 1 and the second lap shell 6, the outside of the stop block 14 is provided with a nut 15 for limiting axial movement, the locking nut 12, the pressure rod 13 and the stop block 14 are all fastened by the nut 15, the first lap shell 1, the second lap shell 6, the locking nut 12 and the pressure rod 13 work together to form an internal load-bearing layer, the first lap shell 1, the second lap shell 6, the stop block 14 and the nut 15 together constitute an external load-bearing layer, wherein, there are multiple rectangular grooves on the inner wall of the stop block 14, the outer wall of the stop block 14 is provided with a wedge-shaped structure for increasing the friction with the cable 19, which can prevent the cable 19 from radially rotating in the first lap shell 1 and the second lap shell 6, and increase the contact friction between the stop block and the cable 19.

[0028] Furthermore, there are rectangular spiral lines on the inner circumferential walls of the locking nut 12 and the pressure rod 13, and the rectangular spiral lines are clearance-fitted. The spiral groove at the bottom of the rectangular spiral line passes through and receives the load-bearing structure inside the cable 19. There are retaining springs on the outer wall around the locking nut. The connection between the tail of the first lap shell 1 and the second lap shell 6 and the locking nut 12 is filled with resin for sealing, and the tail protruding parts of the first lap shell 1 and the second lap shell 6 are provided with a bending limiter protective cover 16.

[0029] Furthermore, the mounting flange 2 is connected to the inside of the first lap shell 1 by pins, the first adjustment flange 3 is connected to the mounting flange 2, a sealing ring is provided between the mounting flange 2 and the first adjustment flange 3, and the first adjustment flange 3 is used to adjust the axial height of the first plug-in 4.

[0030] Furthermore, positioning holes are provided on the first plug-in 4 and the second plug-in 5, positioning pins are provided on the first adjustment flange 3 and the second adjustment flange 7, the first plug-in 4 is connected to the first adjustment flange 3 through the positioning holes and the positioning pins, the second adjustment flange 7 and the second plug-in 5 are connected through the positioning holes and the positioning pins, and the first plug-in 4 and the second plug-in 5 are provided with guide mechanisms, wherein the guide mechanism of one plug-in is provided with a plug-in groove, and the guide mechanism of the other plug-in is provided with a plug-in convex groove.

[0031] Design principle:

[0032] The mounting flange 2 is used to carry the first adjustment flange 3 and divide the internal cavity of the first lap shell 1. Its inner wall has a sealing component in the radial direction. The adjustment flange 3 is used to adjust the height of the first plug-in 4 in the axial direction. The mounting flange 8 and the adjustment flange 7 have similar functions to adjust the height of the second plug-in 5 in the axial direction. There are locating pins on the first adjustment flange 3 and the second adjustment flange 7, and there are locating holes on the first plug-in 4 and the second plug-in 5. Through the first adjustment flange 3 and the second adjustment flange 7, the first plug-in 4 and the second plug-in 5 are accurately docked and misaligned. The first plug-in 4 and the second plug-in 5 each have a guiding mechanism. The pigtail 9 is a key part for wiring and vulcanization lap joints, and the interior is filled with water-blocking glue as a sealing material; the locking nut 12 and the pressure rod 13 are key components for the load-bearing of the cable 19. Both have rectangular spiral lines designed on their inner circumferential walls, and the rectangular spiral lines are clearance-matched. The bottom spiral groove of the rectangular spiral line can pass through and accommodate the load-bearing structure inside the cable 19. There is a retaining spring on the outer circumferential wall of the locking nut 12 to prevent it from rotating in the radial direction and offset the torsional load of the cable 19.

[0033] The tail of the first lap shell 1 and the second lap shell 6 are both designed with a stop block 14, and a plurality of rectangular grooves are arranged on the inner wall of the stop block 14, which increases the contact friction between the stop block 14 and the cable 19. The nut 15 is used to limit the axial movement of the stop block 14. In addition, the wedge-shaped design of the outer wall of the stop block 14 can prevent the cable 19 from radially rotating in the first lap shell 1 and the second lap shell 6, and resist torsional loads; the bend limiter 16 is made of soft plastic material, and its function is to protect the cable 19 from wear and tear and fill the internal sealant, which has a bending and torsion resistance and sealing effect on the cable 19.

[0034] The pigtail 9 and the internal filling materials of the first lap shell 1 and the second lap shell 6 together constitute an internal watertight protective layer, and the bend limiter 16 and the filling sealant together constitute an external watertight protective layer, with two layers of sealing protection; the first lap shell 1, the second lap shell 6, the locking nut 12 and the pressure rod 13 work together to form an internal load-bearing layer, and the first lap shell 1, the second lap shell 6, the stop block 14 and the nut 15 together constitute an external load-bearing layer, two layers of load-bearing protection, and both have radial stopping functions, and can withstand external forces, water flow impacts, etc.; the above-mentioned sealing layers and load-bearing layers are arranged at intervals to assist each other, maximize the functions of their respective areas, and protect the waterproofness of the cable 19.

[0035] The working process of the following cable splicing device:

[0036] First, the fixed ends of the two cables 19 are connected to the first plug-in 4 and the second plug-in 5, and the movable ends of the cables extend outward through the first overlap shell 1 and the second overlap shell 6. The internal mounting flange 2 of the first overlap shell 1 is connected to the first overlap shell 1 by screws, and the first adjustment flange 3 is connected to the mounting flange 2. After the mounting flange 2 is fixed to the first adjustment flange 3, the first plug-in 4 is connected through a pin shaft. At the same time, the internal mounting base 8 of the second overlap shell 6 is connected to the second overlap shell 6 by screws, and the second adjustment flange 7 is connected to the mounting base 8. After the mounting base 8 is fixed to the second adjustment flange 7, the second plug-in 5 is connected through a pin shaft. The first plug-in 4 and the second plug-in The parts 5 are plugged and assembled through their respective guide mechanisms, the first lap joint shell 1 and the second lap joint shell 6 are connected by threads inside and flanges outside, the outsides of the first lap joint shell 1 and the second lap joint shell 6 are respectively connected to the locking nut 12 and the pressure rod 13, the first lap joint shell 1 and the second lap joint shell 6 have radially rotating stop blocks 14, the outside of the stop block 14 is provided with a nut 15 for limiting axial movement, the locking nut 12, the pressure rod 13 and the stop block 14 are all fastened by the nut 15, the tail protruding part of the first lap joint shell 1 and the second lap joint shell 6 is provided with a bending limit protective sleeve 16, and the bending limit protective sleeve 16 is wrapped around the outside of the locking nut 12, the pressure rod 13, the stop block 14 and the nut 15.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A cable splicing device, comprising a first splicing shell (1), a second splicing shell (6), and a first plug-in (4) and a second plug-in (5) connected inside the first splicing shell (1) and the second splicing shell (6), characterized in that: The first plug-in (4) is connected to the second plug-in (5), the first plug-in (4) is connected and fixed by means of a mounting flange (2) and a first adjustment flange (3), the second plug-in (5) is connected and fixed by means of a second adjustment flange (7) and a mounting base (8), the tails of the first plug-in (4) and the second plug-in (5) are connected to a pigtail (9), the first plug-in (4), the mounting flange (2) connected to the first plug-in (4), the adjustment flange (3), the pigtail (9), the second plug-in (5), the second adjustment flange (7) connected to the second plug-in (5), the mounting base (8) and the pigtail (9) are all arranged in a cavity connected to the first lap shell (1) and the second lap shell (6), the tails of the first lap shell (1) and the second lap shell (6) are connected to a locking mechanism; The locking mechanism comprises a locking nut (12) connected to the tail of the first lap joint shell (1) and the second lap joint shell (6), a pressure rod (13) is provided on the outer wall of the locking nut (12), a stop block (14) is provided at the tail of the first lap joint shell (1) and the second lap joint shell (6) to prevent the cable (19) from radially rotating in the first lap joint shell (1) and the second lap joint shell (6), a nut (15) is provided on the outside of the stop block (14) to limit axial movement, the locking nut (12), the pressure rod (13) and the stop block (14) are all fastened by the nut (15), the first lap joint shell (1), the second lap joint shell (6), the locking nut (12) and the pressure rod (13) work together to form an internal load-bearing layer, and the first lap joint shell (1), the second lap joint shell (6), the stop block (14) and the nut (15) together form an external load-bearing layer; The mounting flange (2) is connected to the inside of the first overlap shell (1) via pins, the first adjustment flange (3) is connected to the mounting flange (2), a sealing ring is provided between the mounting flange (2) and the first adjustment flange (3), and the first adjustment flange (3) is used to adjust the axial height of the first plug-in (4).

2. The cable splicing device according to claim 1, characterized in that: The inner circumferential walls of the locking nut (12) and the pressure rod (13) are provided with rectangular spiral lines, the rectangular spiral lines are clearance-matched, the spiral grooves at the bottom of the rectangular spiral lines pass through and receive the load-bearing structure inside the cable (19), and a retaining spring is provided on the outer wall around the locking nut.

3. The cable splicing device according to claim 1, characterized in that: The inner wall of the stop block (14) is provided with a plurality of rectangular grooves, and the outer wall of the stop block (14) is provided with a wedge-shaped structure for increasing the friction force with the cable (19).

4. The cable splicing device according to claim 1, characterized in that: The first plug-in (4) and the second plug-in (5) are provided with positioning holes, the first adjustment flange (3) and the second adjustment flange (7) are provided with positioning pins, the first plug-in (4) and the first adjustment flange (3) are connected via the positioning holes and the positioning pins, and the second adjustment flange (7) and the second plug-in (5) are connected via the positioning holes and the positioning pins.

5. The cable splicing device according to claim 1, characterized in that: The first plug-in unit (4) and the second plug-in unit (5) are provided with guide mechanisms, wherein the guide mechanism of one plug-in unit is provided with a plug-in groove, and the guide mechanism of the other plug-in unit is provided with a plug-in convex groove.

6. The cable splicing device according to claim 1, characterized in that: The connection between the tail of the first overlapping shell (1) and the second overlapping shell (6) and the locking nut (12) is filled with resin for sealing.

7. The cable splicing device according to claim 1, characterized in that: The tail extensions of the first lap shell (1) and the second lap shell (6) are provided with bending limit protection sleeves (16), and the connection between the bending limit protection sleeves (16) and the first lap shell (1) and the second lap shell (6) is filled with sealant.

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