Underwater Electronic Equipment Offshore Construction Device and Operation Method

Abstract

The present invention provides an offshore construction device and operation method for underwater electronic equipment in the field of ocean engineering, including an underwater extension module, a mounting and fixing component, a cable connector component, and a performance detection module. The underwater extension module is connected to the mounting and fixing component, and the underwater extension module is connected to the cable connector component. The performance detection module is connected to the top of the underwater extension module through an air pipe, and the performance detection module respectively performs airtightness detection and optoelectronic performance detection on the underwater extension module. Each extension of the present invention can be disassembled, assembled and maintained independently without interfering with each other; the modular replacement workload is less, avoiding the use of too much manpower and construction machinery; the cable connector adopts a two-time guiding and positioning structure to achieve rapid plugging and unplugging of the cable and reduce the risk of damage to the connector contacts; the airtightness inspection and the equipment performance inspection can be carried out in parallel to improve the operation efficiency; reduce the offshore maintenance operation time, reduce the economic cost, and at the same time reduce the risk to the equipment safety brought by the weather and sea conditions.

Description

Technical Field

[0001] The present invention relates to the field of ocean engineering, and specifically, to an underwater electronic equipment offshore construction device and an operation method thereof. Background Art

[0002] When constructing underwater electronic equipment, it often faces interference from harsh sea conditions. During deployment and maintenance, the underwater equipment is usually lifted or lowered by a conventional barge hoisting method. However, generally, a suitable operation window period needs to be selected, where the sea surface wind force and sea conditions are not sufficient to affect the stability of the mother ship and the crane hoisting. Such window periods are relatively few, resulting in low construction efficiency. At the same time, the marine weather is complex and changeable, and the time span of the window period cannot be accurately estimated. In case of sudden weather changes, the barge is prone to sway in the sea, which not only easily causes safety accidents, but also the construction quality cannot be guaranteed. It is very likely that the equipment maintenance task cannot be completed, and it is necessary to wait for the next window period, greatly increasing the maintenance cost. Therefore, it is necessary to shorten the maintenance operation time on the mother ship as much as possible, while ensuring the maintenance quality, reducing the risk of weather and sea conditions affecting the operation, ensuring the safety of personnel and equipment, and reducing the economic cost.

[0003] In addition, through querying existing patents and literature by keyword search, no patent literature materials with a high degree of relevance to the background and technical field of the present invention were found, and there is currently no content for further comparative analysis. Summary of the Invention

[0004] Aiming at the defects in the prior art, the purpose of the present invention is to provide an underwater electronic equipment offshore construction device and an operation method thereof.

[0005] According to an underwater electronic equipment offshore construction device provided by the present invention, it includes an underwater extension module, a mounting and fixing component, a cable connector component, and a performance detection module. The underwater extension module is connected to the mounting and fixing component, and the underwater extension module is connected to the cable connector component. The performance detection module is connected to the top of the underwater extension module through an air pipe, and the performance detection module respectively performs airtightness detection and optoelectronic performance detection on the underwater extension module.

[0006] In some embodiments, the underwater extension module includes a first underwater extension module, a second underwater extension module, and a third underwater extension module. The first underwater extension module, the second underwater extension module, and the third underwater extension module are respectively connected to the mounting and fixing component. The third underwater extension module is respectively connected to the first underwater extension module and the second underwater extension module. The first underwater extension module and the second underwater extension module are respectively connected to other transmission cables;

[0007] The first underwater extension module includes a first underwater extension, a top housing, a first transmission cable, a connector, and a hanging and fixing member. Hanging and fixing members are respectively connected to both sides of the first underwater extension. The hanging and fixing members are connected to the installation and fixing assembly. The top housing is connected to the top of the first underwater extension. The first transmission cable passes through the top housing, and the connector at the end of the first transmission cable is connected to the first underwater extension.

[0008] In some embodiments, the installation and fixing assembly includes an installation bracket and a guiding member. The guiding member is located on the installation bracket. The hanging and fixing member is connected to the guiding member. The first underwater extension is connected to the installation bracket through the cooperation of the hanging and fixing member and the guiding member.

[0009] In some embodiments, the second underwater extension module includes a second underwater extension, a bracket base, a fixing cover plate, a pressing member, a cap nut, and a second transmission cable. The fixing cover plate is connected to the top of the second underwater extension. The second transmission cable passes through the fixing cover plate and is connected to the second underwater extension. The fixing cover plate is connected to the installation bracket. The pressing member is connected to the bottom of the second underwater extension. The pressing member is connected to the bracket base through the cap nut.

[0010] In some embodiments, the third underwater extension module includes a shaft seat and a third underwater extension. Shaft seats are respectively provided at both ends of the top of the third underwater extension. The shaft seats are respectively connected to the installation bracket through positioning pins and locking screws. The feet at the bottom of the third underwater extension are connected to the support feet of the installation bracket through locking pins.

[0011] In some embodiments, the cable connector assembly includes a compression sleeve, a rubber protective cover, and an optoelectronic socket. The first underwater extension and the second underwater extension are inserted and combined with the optoelectronic socket through the connector, and the connector is locked through the compression sleeve. The rubber protective cover covers the compression sleeve.

[0012] In some embodiments, silica gel is filled in the gap between the compression sleeve and the rubber protective cover.

[0013] In some embodiments, the cable connector assembly further includes a primary guiding member. The connector forms a primary rough positioning on the outer wall of the primary guiding member and the inner wall of the first underwater extension or the second underwater extension or the third underwater extension, so that the coaxiality of the insertion of the connector plug and the optoelectronic socket is realized through the circumferential positioning of the self-positioning key groove of the connector, and a secondary precise insertion is achieved.

[0014] In some embodiments, the performance detection module includes a pressure gauge and an air pump. The airtight plug at the top shell of the first underwater extension or the second underwater extension is disassembled, and the pressure gauge is sequentially connected through an air pipe. The pressure machine is connected to the air pump through an air pipe, and a one-way valve is provided on the air pipe;

[0015] Turn on the air pump and the one-way valve to pressurize the housing of the first underwater unit or the second underwater unit. After the pressure in the housing reaches the predetermined value, close the one-way valve to maintain the air pressure in the housing; during the pressure maintenance process, perform airtight detection and optoelectronic performance detection on the housing.

[0016] The present invention also provides an operation method for an underwater electronic equipment marine construction device, including the following steps:

[0017] S1. Disassembly and assembly of the first underwater unit: Remove the first underwater unit and the top housing, lift the top housing with a crane, then disconnect the connector at the end of the first transmission cable from the first underwater unit, and use the crane to hoist and place it on one side for fixation;

[0018] S2. Remove the lifting and fixing member and the guiding member on the mounting bracket, then place the guiding rod of the auxiliary tooling into the card slot of the lifting and fixing member and the guiding member. After connecting the lifting and fixing member and the auxiliary tooling, slowly lift the first underwater unit out of the mounting bracket with a crane and place it on one side, and then remove the auxiliary tooling. The installation process is the opposite;

[0019] S3. Disassembly and assembly of the second underwater unit: Disconnect the second transmission cable from the second underwater unit, remove the fixed cover plate and the mounting bracket, use the crane to hoist and place the mounting bracket on one side, remove the cap nut on the bracket base, and take out the pressing member. The installation process is the opposite;

[0020] S4. Disassembly and assembly of the third underwater unit: With the assistance of a hydraulic forklift, transfer the third underwater unit to the corresponding installation position on the mounting bracket. The axle seat is connected to the mounting bracket through a positioning pin and locked with a locking screw. The bottom support feet of the third underwater unit are connected to the component support feet through locking pins. The installation process is the opposite;

[0021] S5. Installation of the cable connector: The end connector of the second transmission cable forms a primary rough positioning between the outer wall of the primary guiding member and the inner wall of the second underwater unit. Blindly insert the cable connector plug for precise positioning to achieve secondary precise insertion. Lock the connector with a compression sleeve. Finally, cover the compression sleeve with a rubber protection cover and fill the gap with silicone;

[0022] S6. Performance test: Install the pressure gauges on the top of the first underwater unit or / and the second underwater unit through air pipes respectively. Turn on the air pump to inflate the inner housing of the first underwater unit or / and the second underwater unit. When the pressure gauge reaches a certain value, disconnect the air path and close the valve to keep the air pressure in the housing for a period of time. Perform airtight detection on the housing in sequence. Finally, during the pressure maintenance time, test the optoelectronic performance before the equipment is laid underwater to ensure the normal state of the equipment before it is put into the water.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) In the present invention, each extension unit can be disassembled, assembled and maintained independently without interfering with each other; and the modular replacement method is adopted, with less engineering work, avoiding the use of excessive manpower and construction tools.

[0025] (2) In the present invention, the cable connector adopts a two-stage guiding and positioning structure to achieve fast plugging and unplugging of the cable and reduce the risk of damage to the contact parts of the connector.

[0026] (3) In the present invention, the airtightness inspection and the equipment performance inspection can be carried out in parallel to improve the operation efficiency.

[0027] (4) The present invention reduces the time of offshore maintenance operations, reduces the economic cost, and at the same time reduces the risk to the equipment safety brought by weather and sea conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Other features, objects and advantages of the present invention will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0029] Figure 1 is the construction operation flow chart of the present invention;

[0030] Figure 2 is the schematic structural diagram of the first underwater extension unit of the present invention;

[0031] Figure 3 is the schematic diagram of the sling installation of the first underwater extension unit of the present invention;

[0032] Figure 4 is the schematic diagram of the guiding installation of the first underwater extension unit of the present invention;

[0033] Figure 5 is the schematic diagram of the installation and fixation of the second underwater extension unit of the present invention;

[0034] Figure 6 is the schematic diagram of the installation and fixation of the third underwater extension unit of the present invention;

[0035] Figure 7 is the partial schematic diagram of the installation and fixation of the third underwater extension unit of the present invention;

[0036] Figure 8 is the schematic diagram of the disassembly and assembly of the third underwater extension unit of the present invention;

[0037] Figure 9 is the schematic diagram of the plugging and unplugging of the cable connector of the present invention;

[0038] Figure 10 is the schematic diagram of the parallel airtightness detection of the present invention.

[0039] Reference numerals in the drawings:

[0040] 1. First underwater extension unit, 2. Top housing, 3. First transmission cable, 4. Connector, 5. Hoisting and fixing member, 6. Guide rod, 7. Bolt assembly, 8. Auxiliary tooling, 9. Mounting bracket, 10. Guide member, 11. Second underwater extension unit, 12. Base, 13. Cover plate, 14. Fixing screw, 15. Pressing member, 16. Cap nut, 17. Second transmission cable, 18. Shaft seat, 19. Positioning pin, 20. Locking screw, 21. Third underwater extension unit, 22. Support leg, 23. Locking pin, 24. Hydraulic forklift, 25. Pressing sleeve, 26. Protective cover, 27. Optoelectronic socket, 28. Primary guide member, 29. Pressure gauge, 30. Air pump. Detailed implementation manners

[0041] The present invention will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can still be made. These all fall within the protection scope of the present invention.

[0042] Example 1

[0043] According to an offshore construction device for underwater electronic equipment provided by the present invention, as Figures 2 - 10 shown, it includes an underwater extension unit module, a mounting and fixing assembly, a cable connector assembly, and a performance detection module. The underwater extension unit module is connected to the mounting and fixing assembly, and the underwater extension unit module is connected to the cable connector assembly. The performance detection module is connected to the top of the underwater extension unit module through an air pipe, and the performance detection module performs airtightness detection and optoelectronic performance detection on the underwater extension unit module respectively.

[0044] The underwater extension unit module includes a first underwater extension unit module, a second underwater extension unit module, and a third underwater extension unit module. The first underwater extension unit module, the second underwater extension unit module, and the third underwater extension unit module are respectively connected to the mounting and fixing assembly. The mounting and fixing assembly includes a mounting bracket 9 and a guide member 10. The guide member 10 is located on the mounting bracket 9. The hoisting and fixing member 5 is connected to the guide member 10. The first underwater extension unit 1 is connected to the mounting bracket 9 through the cooperation of the hoisting and fixing member 5 and the guide member 10. The third underwater extension unit module is respectively connected to the first underwater extension unit module and the second underwater extension unit module through the cable connector assembly. The first underwater extension unit module and the second underwater extension unit module are respectively connected to other transmission cables through the cable connector assembly.

[0045] The first underwater extension module includes a first underwater extension 1, a top housing 2, a first transmission cable 3, a connector 4, and a hanging and fixing member 5. Hanging and fixing members 5 are respectively connected to both sides of the first underwater extension 1. The hanging and fixing members 5 are connected to the installation and fixing assembly. The top housing 2 is connected to the top of the first underwater extension 1. The first transmission cable 3 passes through the top housing 2, and the connector 4 at the end of the first transmission cable 3 is connected to the first underwater extension 1.

[0046] The second underwater extension module includes a second underwater extension 11, a support base 12, a fixing cover plate 13, a pressing member 15, a cap nut 16, and a second transmission cable 17. The top of the second underwater extension 11 is connected to the fixing cover plate 13. The second transmission cable 17 passes through the fixing cover plate 13 and is connected to the second underwater extension 11. The fixing cover plate 13 is connected to the installation bracket 9. The bottom of the second underwater extension 11 is connected to the pressing member 15. The pressing member 15 is connected to the support base 12 through the cap nut 16.

[0047] The third underwater extension module includes a shaft seat 18 and a third underwater extension 21. Shaft seats 18 are respectively provided at both ends of the top of the third underwater extension 21. The shaft seats 18 are respectively connected to the installation bracket 9 through positioning pins 19 and locking screws 20. The feet at the bottom of the third underwater extension 21 are connected to the support feet 22 of the installation bracket 9 through locking pins 23.

[0048] The cable connector assembly includes a compression sleeve 25, a rubber protective cover 26, an optoelectronic socket 27, and a primary guiding member 28. The first underwater extension 1 and the second underwater extension 11 are inserted and combined with the optoelectronic socket 27 through the connector 4, and the connector 4 is locked by the compression sleeve 25. The rubber protective cover 26 covers the compression sleeve 25, and silica gel is filled in the gap between the compression sleeve 25 and the rubber protective cover 26. The connector 4 forms a primary rough positioning on the outer wall of the primary guiding member 28 and the inner wall of the first underwater extension 1 or the second underwater extension 11 or the third underwater extension 21, so that the coaxiality of the insertion of the connector 4 plug and the optoelectronic socket 27 is realized under the circumferential positioning of the self-positioning key groove of the connector 4 for secondary precise insertion.

[0049] The performance detection module includes a pressure gauge 29 and an air pump 30. The airtight plug of the top housing of the first underwater extension 1 or the second underwater extension 11 is removed, and the pressure gauge 29 is sequentially connected through an air pipe. The pressure gauge 29 is connected to the air pump 30 through an air pipe, and a one-way valve is provided on the air pipe; the air pump 30 and the one-way valve are opened to pressurize the housing of the first underwater extension 1 or the second underwater extension 11. When the pressure in the housing reaches a predetermined value, the one-way valve is closed to keep the air pressure in the housing; during the pressure holding process, the airtightness detection and optoelectronic performance detection of the housing are carried out.

[0050] Example 2

[0051] The present invention also provides an operation method for an underwater electronic device offshore construction device, as Figure 1 shown, which includes the following steps:

[0052] S1. Disassembly and assembly of the first underwater extension 1: Remove the first underwater extension 1 and the top housing 2, lift the top housing 2 with a crane, then disconnect the connector 4 at the end of the first transmission cable 3 from the first underwater extension 1, and lift and place it aside for fixation with a crane;

[0053] S2. Remove the lifting and fixing member 5 and the guiding member 10 on the mounting bracket 9, then place the guiding rod 6 of the auxiliary tooling 8 into the card slots of the lifting and fixing member 5 and the guiding member 10. After connecting the lifting and fixing member 5 and the auxiliary tooling 8, slowly lift the first underwater extension 1 out of the mounting bracket 9 with a crane and place it aside, and then remove the auxiliary tooling 8. The installation process is the reverse;

[0054] S3. Disassembly and assembly of the second underwater extension 11: Disconnect the second transmission cable 17 from the second underwater extension 11, remove the fixed cover plate 13 and the mounting bracket 9, lift and place the mounting bracket 9 aside with a crane, remove the cap nut 16 on the bracket base 12, and take out the pressing member 15. The installation process is the reverse;

[0055] S4. Disassembly and assembly of the third underwater extension 21: With the assistance of a hydraulic forklift 24, transfer the third underwater extension 21 to the corresponding installation position on the mounting bracket 9. The shaft seat 18 is connected to the mounting bracket 9 through a positioning pin 19 and locked with a locking screw 20. The bottom feet of the third underwater extension 21 are connected to the member support feet 22 through a locking pin 23. The installation process is the reverse;

[0056] S5. Installation of the cable connector: The end connector of the second transmission cable 17 forms a primary rough positioning between the outer wall of the primary guiding member 28 and the inner wall of the second underwater extension 11. Blindly insert the cable connector plug for precise positioning with the optoelectronic socket 27 to achieve secondary precise insertion and combination. Lock the connector through the compression sleeve 25. Finally, cover the compression sleeve 25 with the rubber protection cover 26 and fill the gap with silica gel;

[0057] S6. Performance test: Install the pressure gauge 29 on the top of the first underwater extension 1 or / and the second underwater extension 11 through an air pipe respectively. Open the air pump 30 to inflate the inner housing of the first underwater extension 1 or / and the second underwater extension 11. When the pressure gauge 29 reaches a certain value, disconnect the air path and close the valve to keep the air pressure in the housing for a period of time. Conduct airtight detection on the housing in turn. Finally, during the pressure holding time, test the optoelectronic performance of the equipment before it is lowered into the water to ensure that the equipment is in a normal state before being lowered into the water.

[0058] More specifically, in Figure 1The construction work flow chart shown can be divided into the underwater extension disassembly and assembly stage, the cable connector installation stage, and the performance testing stage.

[0059] exist Figure 2 , Figure 3 , Figure 4 In the structural diagram of the first underwater extension 1, the hoist installation diagram and the guide installation diagram shown, first remove the circumferential screws between the cylinder of the first underwater extension 1 and the top shell 2, and lift the top shell 2 slightly with a crane to make room for operation, then disconnect the end connector 4 of the first transmission cable 3 from the first underwater extension 11 at the lower end, and use the crane to hang it aside for fixing. Again, remove the fixing screws of the hanging and fixing member 5 and the guide member 10 on the mounting bracket 9, and then put the guide rod 6 of the auxiliary tooling 8 into the slots of the hanging and fixing member 5 and the guide member 10, and after fastening the hanging and fixing member 5 and the auxiliary tooling 8 with the bolt assembly 7, use the crane to slowly lift the first underwater extension 1 out of the mounting bracket 9 and put it aside, and remove the auxiliary tooling 8. The installation process of the standby extension is completely opposite to the removal process, and will not be described again.

[0060] exist Figure 5 In the schematic diagram of the installation and fixing of the second underwater extension 11 shown, first disconnect the second transmission cable 17 from the second underwater extension 11, and install the screw cover to protect the cylinder socket, without destroying the sealing of the original cylinder. Next, remove the fixing cover plate 13 and the support plate fixing screws 14 on the mounting bracket 9, and then remove the cap nut 16 on the bracket base 12, and take out the clamping member 15. At this point, the second underwater extension 11 is separated from the mounting bracket 9 and can be hoisted to one side by a crane. The installation process of the spare cylinder is completely opposite to the removal process and will not be described again.

[0061] exist Figures 6 - 8 In the installation and fixing schematic diagram and the disassembly schematic diagram of the third underwater extension 21 shown, shaft seats 19 are hung at both ends of the rotating cross beam 18 at the top of the third underwater extension 21. With the assistance of a hydraulic forklift 24, it is transferred to the corresponding installation position of the mounting bracket 9. The shaft seat 18 is pre-connected with the mounting bracket 9 through the positioning pin 19 and locked with the locking screw 20. During the rotation of the third underwater extension 21, the bottom support foot is aligned with the hole position on the component support foot 22, and the two are fixed with the locking pin 23. At this point, the fixed installation of the third underwater extension 21 is completed. The extension removal process is completely opposite to the installation process and will not be described again. During the disassembly and assembly of the third underwater extension 21, a hydraulic forklift 24 is used for transfer and lifting, which avoids interference with the upper end component when using a crane.

[0062] exist Figure 9In the schematic diagram of plugging and unplugging of the cable connector shown, the connector 4 at the end of the second transmission cable 17 forms a primary rough positioning between the outer wall of the primary guiding member 28 and the inner wall of the second underwater extension 11, which can ensure the coaxiality of the plug of the connector and the optoelectronic socket 27. Under the circumferential positioning of its own positioning keyway, secondary precise plugging is achieved. Therefore, blind plugging can be carried out during the plugging process of the cable connector, thus saving operation time. After the connector is plugged, the connector is locked by using the compression sleeve 25. Finally, the rubber protection cover 26 is covered on the compression sleeve 25, and silica gel is filled in the gap.

[0063] In Figure 10 In the schematic diagram of airtightness parallel detection shown, the air pump 30 can simultaneously inflate the inner shells of multiple first underwater extensions 1. When the pressure gauge 29 reaches the specified value, the air path is disconnected, and the pressure inside the shell is maintained under the action of the one-way valve. While the airtightness detection is in progress, the optoelectronic performance of the entire underwater device can be tested to ensure the normal state of the device before it is put into the water.

[0064] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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, and therefore should not be construed as a limitation to the present application.

[0065] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other.

Claims

1. An offshore construction device for underwater electronic equipment, characterized in that, It includes an underwater extension module, a mounting and fixing component, a cable connector component, and a performance detection module. The underwater extension module is connected to the mounting and fixing component, and the underwater extension module is connected to the cable connector component. The performance detection module is connected to the top of the underwater extension module through an air pipe, and the performance detection module performs airtightness detection and optoelectronic performance detection on the underwater extension module respectively; The underwater extension module includes a first underwater extension module, a second underwater extension module, and a third underwater extension module. The first underwater extension module, the second underwater extension module, and the third underwater extension module are respectively connected to the mounting and fixing component. The third underwater extension module is respectively connected to the first underwater extension module and the second underwater extension module. The first underwater extension module and the second underwater extension module are respectively connected to other transmission cables; The first underwater extension module includes a first underwater extension (1), a top housing (2), a first transmission cable (3), a connector (4), and a hanging and fixing member (5). The hanging and fixing member (5) is respectively connected to both sides of the first underwater extension (1). The hanging and fixing member (5) is connected to the mounting and fixing component. The top housing (2) is connected to the top of the first underwater extension (1). The first transmission cable (3) passes through the top housing (2), and the connector (4) at the end of the first transmission cable (3) is connected to the first underwater extension (1); The mounting and fixing component includes a mounting bracket (9) and a guiding member (10). The guiding member (10) is located on the mounting bracket (9). The hanging and fixing member (5) is connected to the guiding member (10). The first underwater extension (1) is connected to the mounting bracket (9) through the cooperation of the hanging and fixing member (5) and the guiding member (10); The second underwater extension module includes a second underwater extension (11), a bracket base (12), a fixing cover plate (13), a pressing member (15), a cap nut (16), and a second transmission cable (17). The top of the second underwater extension (11) is connected to the fixing cover plate (13). The second transmission cable (17) passes through the fixing cover plate (13) and is connected to the second underwater extension (11). The fixing cover plate (13) is connected to the mounting bracket (9). The bottom of the second underwater extension (11) is connected to the pressing member (15). The pressing member (15) is connected to the bracket base (12) through the cap nut (16); The third underwater extension module includes a shaft seat (18) and a third underwater extension (21). The shaft seats (18) are respectively provided at both ends of the top of the third underwater extension (21). The shaft seats (18) are respectively connected to the mounting bracket (9) through positioning pins (19) and locking screws (20). The feet at the bottom of the third underwater extension (21) are connected to the braces (22) of the mounting bracket (9) through locking pins (23); The cable connector assembly includes a compression sleeve (25), a rubber protective cover (26), and an optoelectronic socket (27). The first underwater extension unit (1) and the second underwater extension unit (11) are inserted into the optoelectronic socket (27) through the connector (4), and the connector (4) is locked by the compression sleeve (25). The rubber protective cover (26) covers the compression sleeve (25). The cable connector assembly further includes a primary guiding member (28). The connector (4) forms a primary rough positioning on the outer wall of the primary guiding member (28) and the inner wall of the first underwater extension unit (1) or the second underwater extension unit (11) or the third underwater extension unit (21), so that the coaxiality of the insertion of the connector (4) plug into the optoelectronic socket (27) is achieved through circumferential positioning of the self-positioning keyway of the connector (4), and secondary precise insertion is realized.

2. The offshore construction device for underwater electronic equipment according to claim 1, characterized in that, Silica gel is filled in the gap between the compression sleeve (25) and the rubber protective cover (26).

3. The underwater electronic device marine construction device according to claim 1, characterized in that, The performance detection module includes a pressure gauge (29) and an air pump (30). The airtight plug of the top shell of the first underwater extension unit (1) or the second underwater extension unit (11) is removed, and the pressure gauge (29) is connected in sequence through an air pipe. The pressure gauge (29) is connected to the air pump (30) through the air pipe, and a one-way valve is provided on the air pipe. Open the air pump (30) and the one-way valve to pressurize the shell of the first underwater extension unit (1) or the second underwater extension unit (11). When the pressure in the shell reaches a predetermined value, close the one-way valve to keep the air pressure in the shell. During the pressure holding process, airtight detection and optoelectronic performance detection of the shell are carried out.

4. An operation method of an underwater electronic device offshore construction device according to any one of claims 1-3, characterized in that, It includes the following steps: S1. Disassembly and assembly of the first underwater extension unit (1): Remove the first underwater extension unit (1) from the top shell (2). The crane lifts the top shell (2), and then disconnects the connector (4) at the end of the first transmission cable (3) from the first underwater extension unit (1), and hoists and places it aside for fixation with the crane. S2. Remove the lifting and fixing member (5) from the guiding member (10) on the mounting bracket (9). Then, place the guiding rod (6) of the auxiliary tooling (8) into the card slot of the lifting and fixing member (5) and the guiding member (10). After connecting the lifting and fixing member (5) with the auxiliary tooling (8), slowly lift the first underwater extension unit (1) out of the mounting bracket (9) with the crane and place it aside. Remove the auxiliary tooling (8). The installation process is the reverse. S3. Disassembly and assembly of the second underwater extension unit (11): Disconnect the second transmission cable (17) from the second underwater extension unit (11). Remove the fixed cover plate (13) from the mounting bracket (9). Lift and place the mounting bracket (9) aside with the crane. Remove the cap nut (16) on the bracket base (12) and take out the compression member (15). The installation process is the reverse. S4. Disassembly and assembly of the third underwater extension unit (21): With the assistance of a hydraulic forklift (24), transfer the third underwater extension unit (21) to the corresponding installation position on the installation bracket (9). The shaft seat (18) is connected to the installation bracket (9) through the positioning pin (19) and locked by the locking screw (20). The bottom feet of the third underwater extension unit (21) are connected to the component support feet (22) through the locking pin (23). The installation process is the reverse; S5. Installation of the cable connector: The end connector of the second transmission cable (17) forms a primary rough positioning between the outer wall of the primary guiding member (28) and the inner wall of the second underwater extension unit (11). Blindly insert the cable connector plug for precise positioning with the optoelectronic socket (27) to achieve secondary precise insertion. Lock the connector through the compression sleeve (25). Finally, cover the compression sleeve (25) with the rubber protective cover (26) and fill the gap with silica gel; S6. Performance test: Install the pressure gauge (29) on the top of the first underwater extension unit (1) and / or the second underwater extension unit (11) through air pipes respectively. Open the air pump (30) to inflate the inner shell of the first underwater extension unit (1) and / or the second underwater extension unit (11). When the pressure gauge (29) reaches a certain value, disconnect the air path and close the valve to keep the air pressure in the shell for a period of time. Conduct airtight detection on the shell in sequence. Finally, during the pressure holding time, test the optoelectronic performance of the equipment before it is deployed underwater to ensure that the equipment is in a normal state before going underwater.

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