CN117096794A - Power cable repair operation method - Google Patents

Abstract

The invention relates to the technical field of power system maintenance, in particular to a power cable repair operation method, wherein a bracket moves to be above a damaged cable under the drive of a submersible, and then the submersible drives the bracket to descend so that the bracket covers the cable; the driving device drives the two rotating shells to rotate and close, and the sealing shell is attached to the rotating shells through the suction force of the first magnet and synchronously rotates along with the rotating shells; after the two sealing shells are closed, starting a melting device, wherein the melting device melts and connects the joint between the two sealing shells, then starting a gas supply device, pumping gas into the sealing shells by the gas supply device, and discharging seawater in the sealing shells through a liquid discharge valve; and then stopping the gas supply device, starting the liquid supply device, pumping the repairing liquid into the rotating shells by the liquid supply device, and driving the two rotating shells to be separated by the driving device after the repairing liquid is solidified. The invention avoids the step of cutting and salvaging the cable to the water surface when repairing the submarine cable, and reduces the repairing cost.

Description

Power cable repair operation method

Technical Field

The invention relates to the technical field of power system maintenance, in particular to a power cable repair operation method.

Background

In the prior art, most of cable repairing devices used in cable repairing are complicated, sealing equipment of bellows and other equipment is required to be sleeved at the tail end of a power cable and fastened by means of a hose clamp and the like, so that the applicability is poor. Meanwhile, due to the fact that the second sections of the connecting terminals at the tail ends of some cables are irregular in shape and size, repair cannot be carried out in a sleeved bellows mode in some cases.

Chinese patent CN113629600B discloses a cable repair adapter, which comprises a first sleeve, a first sleeve and a second sleeve, wherein the first sleeve is used for coating the outer side of a cable to be repaired, and comprises at least two seal shells distributed along the circumferential direction of the first sleeve, and any adjacent seal shells are in sealing connection, each seal shell is used for being pressed on the cable to be repaired, and at least one seal shell is provided with an injection hole; the first sleeve can form an injection cavity with the cable to be repaired, and the injection hole is communicated with the injection cavity so as to inject repair liquid into the injection cavity.

In the deep sea, when the cable is broken, the cable is usually required to be salvaged to the sea surface for repair after the cable is cut, and if the cable is broken only on the outer surface, the repair is carried out by the method, so that the repair cost is huge, and the existing remote repair method is usually robot repair, but the repair liquid can be poured into the cable only by discharging seawater before the operation in the deep sea.

Disclosure of Invention

In order to solve the above problems, the power cable repairing operation method is provided, the support is driven by the submersible to move above a cable with damage, then the submersible drives the support to descend so that the support covers the cable, the driving device drives the two rotating shells to rotate and close, the sealing shells are attached to the rotating shells through the suction force of the first magnet and synchronously rotate along with the rotating shells, after the two sealing shells are closed, the melting device is started, the melting device melts and connects the joint between the two sealing shells, then the air supply device is started, the air supply device pumps air into the sealing shells, seawater in the sealing shells is discharged through the liquid discharge valve, then the air supply device is stopped, the liquid supply device is started, the repairing liquid is pumped into the rotating shells by the liquid supply device, the driving device drives the two rotating shells to be separated after the repairing liquid is solidified, the step of cutting and salvaging the cable to the water surface when the submarine cable is repaired is avoided, and the repairing cost is reduced.

In order to solve the problems in the prior art, the power cable repairing operation method is characterized in that the method is implemented by adopting power cable repairing equipment, wherein the power cable repairing equipment comprises a bracket, a sealing device and a submersible, and the sealing device comprises a rotating shell, a driving device, a sealing shell, a liquid discharge valve, a first magnet, a gas supply device, a liquid supply device and a melting device; the support is of a semi-surrounding structure, the opening of the support is vertically downward, two rotating shells are symmetrically arranged in the support along the length direction of the support, the rotating shells are of a semicircular shell structure, the two rotating shells can synchronously rotate in opposite directions or rotate in opposite directions, and the two rotating shells which rotate in opposite directions are of a circular structure after being closed; the driving device is arranged on one side of the rotating shell and drives the rotating shell to rotate; the sealing shells are arranged in the rotating shells, the sealing shells are of semicircular shell structures, semicircular through holes are formed in the sealing shells along the axes of the sealing shells, when the two rotating shells are closed, the two sealing shells can be driven to be closed, the two closed semicircular through holes form a complete circular through hole, and a power cable passes through the circular through hole; the liquid discharge valve is arranged on the side wall of one of the rotating shells, and a discharge port is arranged on the sealing shell at a position corresponding to the liquid discharge valve; the first magnet is arranged on one side of the sealing shell, which is close to the rotating shell, and is fixedly connected with the sealing shell, and the first magnet is attracted on the rotating shell; the air supply device is arranged on the side wall of one of the rotating shells and can supply air to the inside of the closed rotating shell; the liquid supply device is arranged at one side of the liquid discharge valve, the liquid supply device is communicated with the rotating shell, repair liquid is arranged in the liquid supply device, and the liquid supply device can supply the repair liquid into the rotating shell; the two melting devices are respectively arranged at the upper side and the lower side of the rotating shell in a closed state, the melting devices can melt and connect the connecting parts of the two sealing shells,

the specific operation steps are as follows:

s1, moving a bracket to be above a damaged cable under the drive of a submersible, and then driving the bracket to descend by the submersible so that the bracket covers the cable;

s2, the driving device drives the two rotating shells to rotate and close, and the sealing shell is attached to the rotating shells through the suction force of the first magnet and synchronously rotates along with the rotating shells;

s3, after the two sealing shells are closed, starting a melting device, wherein the melting device melts and connects the joint between the two sealing shells, then starting an air supply device, pumping air into the sealing shells by the air supply device, and discharging seawater in the sealing shells through a liquid discharge valve;

s4, stopping the gas supply device, starting the liquid supply device, pumping the repairing liquid into the rotating shells by the liquid supply device, and driving the two rotating shells to be separated by the driving device after the repairing liquid is solidified.

Preferably, the end seal assembly comprises a heat shrink tube, a fixture, a heater, and a second magnet; the heat shrinkage tube is of a semicircular structure, the heat shrinkage tube is fixedly arranged at two ends of the self-sealing shell, the axis of the heat shrinkage tube is collinear with the axis of the sealing shell, and the diameter of the heat shrinkage tube is larger than that of the cable; the fixing devices are respectively arranged on the heat shrinkage tubes at the same side ends of the two sealing shells, and have a fixing effect on the heat shrinkage tubes; the heater is arranged at one side of the heat-shrinkable tube and can heat the heat-shrinkable tube; the second magnet is fixed to be set up the outside of pyrocondensation pipe one end, and the second magnet adsorbs on rotating the shell.

Preferably, the fixing device comprises a bolt and a jack; the bolt is fixedly arranged on one of the heat shrinkage pipes; the jack is arranged on the other heat shrinkage pipe, and after the two heat shrinkage pipes are closed, the bolt is in plug-in fit with the jack.

Preferably, the melting device comprises a fusion splicer and a gas tank; the welding device is arranged above the joint of the two sealing shells in a closed state and can be used for carrying out fusion connection on the joint; the gas jar sets up in one side of butt fusion ware, and the gas tube communicates with butt fusion ware, and the gas jar provides fuel for butt fusion ware.

Preferably, the sealing device further comprises a connecting device, wherein the connecting device comprises a reversing valve and a switching valve; the switch valve is arranged between the air supply device and the rotating shell; the reversing valve is arranged on the liquid discharge valve and is connected with the liquid supply device.

Preferably, the drain valve is located below the on-off valve.

Preferably, the sealing device further comprises an air supply device, and the air supply device comprises an air storage tank and a sliding plate; the air storage tank is arranged at one side of the switch valve, the air storage pipe is communicated with the switch valve, a first pump body is arranged at one side of the air storage tank close to the switch valve, and a through hole is formed in the bottom of the air storage tank; the sliding plate is arranged in the gas storage tube in a sliding mode along the axis of the through hole, and the sliding plate, the first pump body and the gas storage tube form a gas storage cavity.

Preferably, the liquid supply means comprises an elastic sleeve; one end of the elastic sleeve is provided with an opening, the elastic sleeve is made of elastic materials, repair liquid is stored in the elastic sleeve, one end of the elastic sleeve, which is provided with the opening, is communicated with the reversing valve, and a second pump body is arranged between the elastic sleeve and the reversing valve.

Preferably, the driving device comprises a rotary driver, a first gear, a second gear and a hoisting frame; the hoisting frame is fixedly arranged in the bracket; the rotary driver is arranged on the hoisting frame along the axis of the rotary shell; the first gear is fixedly arranged at the output end of the rotary driver; the second gears are arranged at the same side end parts of the two rotating shells respectively, the two second gears are meshed with each other, and the first gear is meshed with one of the second gears.

Preferably, the rotating shell is capable of being energized to generate magnetism.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the support is driven by the submersible to move above a cable with damage, then the submersible drives the support to descend so that the support covers the cable, the driving device drives the two rotating shells to rotate and close, the sealing shells are attached to the rotating shells through the suction force of the first magnet and synchronously rotate along with the rotating shells, after the two sealing shells are closed, the melting device is started, the connecting part between the two sealing shells is melted and connected by the melting device, then the air supply device is started, air is pumped into the sealing shells by the air supply device, seawater in the sealing shells is discharged through the liquid discharge valve, then the air supply device is stopped, the liquid supply device is started, the repair liquid is pumped into the rotating shells by the liquid supply device, and after the repair liquid is solidified, the driving device drives the two rotating shells to separate, so that the step of fishing the cable to the water surface when the submarine cable is repaired is avoided, and the repair cost is reduced.

Drawings

Fig. 1 is a schematic perspective view of a power cable repair apparatus.

Fig. 2 is a schematic perspective view of a power cable repair device.

Fig. 3 is a schematic perspective view of a power cable repair device with a bracket removed.

Fig. 4 is an enlarged partial schematic view of the power cable repair device at a in fig. 3.

Fig. 5 is a side view of a power cable repair apparatus with a bracket removed.

Fig. 6 is a schematic cross-sectional view of a power cable repair apparatus at B-B of fig. 5.

Fig. 7 is an enlarged partial schematic view of the power cable repair device at C in fig. 6.

Fig. 8 is a second perspective view of the power cable repair device with the bracket removed.

Fig. 9 is a perspective view of a power cable repair apparatus with the heater and bracket removed.

Fig. 10 is a perspective view of the power cable repair device with the first magnet, the second magnet, the heater and the bracket removed.

Fig. 11 is a partially enlarged schematic illustration of the power cable repair apparatus at D in fig. 10.

The reference numerals in the figures are:

1-a bracket; 2-sealing means; 21-rotating the shell; 22-driving means; 221-a rotary drive; 222-a first gear; 223-a second gear; 224-hoisting frame; 23-sealing the shell; 231-a drain valve; 232-a first magnet; 233-connecting means; 2331-reversing valve; 2332-on-off valve; 24-end seal assembly; 241-heat shrinking pipe; 242-securing means; 2421-a latch; 243-a heater; 244-a second magnet; 25-air supply device; 251-an air storage tank; 252-sliding plate; 26-a liquid supply device; 261-elastic sleeve; 27-a melting device; 271-a welder; 272-gas canister; 3-cable.

Detailed Description

The invention will be further described in detail with reference to the drawings and the detailed description below, in order to further understand the features and technical means of the invention and the specific objects and functions achieved.

Referring to fig. 1-3, 5, 9 and 10: the power cable repairing operation method is implemented by adopting power cable repairing equipment, wherein the power cable repairing equipment comprises a bracket 1, a sealing device 2 and a submersible, and the sealing device 2 comprises a rotating shell 21, a driving device 22, a sealing shell 23, a liquid discharge valve 231, a first magnet 232, a gas supply device 25, a liquid supply device 26 and a melting device 27; the bracket 1 is of a semi-surrounding structure, the opening of the bracket 1 is vertically downward, two rotating shells 21 are symmetrically arranged in the bracket 1 along the length direction of the bracket 1, the rotating shells 21 are of a semicircular shell structure, the two rotating shells 21 can synchronously rotate in opposite directions or back to back, and the two rotating shells 21 rotating in opposite directions are of a circular structure after being closed; the driving device 22 is arranged at one side of the rotating shell 21, and the driving device 22 drives the rotating shell 21 to rotate; the sealing shells 23 are arranged in the rotating shells 21, the sealing shells 23 are of semicircular shell structures, semicircular through holes are formed in the sealing shells 23 along the axes of the sealing shells, when the two rotating shells 21 are closed, the two sealing shells 23 can be driven to be closed, the two semicircular through holes after closing form a complete circular through hole, and a power cable passes through the circular through hole; the drain valve 231 is arranged on the side wall of one of the rotating shells 21, and a discharge port is arranged on the sealing shell 23 at a position corresponding to the drain valve 231; the first magnet 232 is arranged on one side of the sealing shell 23, which is close to the rotating shell 21, the first magnet 232 is fixedly connected with the sealing shell 23, and the first magnet 232 is magnetically attracted on the rotating shell 21; the air supply device 25 is arranged on the side wall of one of the rotating shells 21, and the air supply device 25 can supply air to the inside of the closed rotating shell 21; the liquid supply device 26 is arranged at one side of the liquid discharge valve 231, the liquid supply device 26 is communicated with the rotating shell 21, the liquid supply device 26 is internally provided with repairing liquid, and the liquid supply device 26 can supply the repairing liquid into the rotating shell 21; the melting devices 27 are provided in two, the melting devices 27 are respectively provided at the upper side and the lower side of the rotating case 21 in the closed state, the melting devices 27 can melt-connect the junction of the two seal cases 23,

the specific operation steps are as follows:

s1, the bracket 1 moves to the position above a broken cable 3 under the drive of a submersible, and then the submersible drives the bracket 1 to descend so that the bracket 1 covers the cable 3;

s2, the driving device 22 drives the two rotating shells 21 to rotate and close, and the sealing shell 23 is attached to the rotating shells 21 by the suction force of the first magnet 232 and synchronously rotates along with the rotating shells 21;

s3, after the two sealing shells 23 are closed, starting a melting device 27, wherein the melting device 27 melts and connects the joint between the two sealing shells 23, then starting a gas supply device 25, pumping gas into the sealing shells 23 by the gas supply device 25, and discharging seawater in the sealing shells 23 through a liquid discharge valve 231;

s4, then the air supply device 25 is stopped, the liquid supply device 26 is started, the liquid supply device 26 pumps the repairing liquid into the rotating shells 21, and the driving device 22 drives the two rotating shells 21 to be separated after the repairing liquid is solidified.

Referring to fig. 2, 3, 9 and 10: the end seal assembly 24 includes a heat shrink tube 241, a fixture 242, a heater 243, and a second magnet 244; the heat shrinkage tube 241 is of a semicircular structure, the heat shrinkage tube 241 is fixedly arranged at two ends of the self-sealing shell 23, the axis of the heat shrinkage tube 241 is collinear with the axis of the sealing shell 23, and the diameter of the heat shrinkage tube 241 is larger than that of the cable 3; the fixing devices 242 are respectively arranged on the heat shrinkage tubes 241 at the same side end parts of the two sealing shells 23, and the fixing devices 242 have a fixing effect on the heat shrinkage tubes 241; the heater 243 is arranged at one side of the heat shrinkage tube 241, and the heater 243 can heat the heat shrinkage tube 241; the second magnet 244 is fixedly disposed outside one end of the heat shrinkage tube 241, and the second magnet 244 is attached to the rotation housing 21.

After the support 1 is stabilized, the driving device 22 drives the rotating shell 21 to be closed, the sealing shell 23 fixed on the rotating shell 21 through the first magnet 232 synchronously rotates along with the rotating shell 21, the sealing shell 23 synchronously rotates along with the heat shrinkage tube 241 fixedly arranged on one side of the sealing shell 23, so that the two semicircular heat shrinkage tubes 241 are synchronously closed, the two heat shrinkage tubes 241 are fixed through the fixing device 242 after being closed, after the heater 243 is heated, the heat shrinkage tube 241 cannot wrap the cable 3 due to self shrinkage, the diameter of the heat shrinkage tube 241 is larger than that of the cable 3, the heat shrinkage tube 241 is attached to the cable 3 after being heated and shrunk, and the tightness in the sealing shell 23 is ensured.

Referring to fig. 10 and 11: the fixing device 242 includes a latch 2421 and a jack; the bolt 2421 is fixedly arranged on one of the heat shrinkage pipes 241; the jack is arranged on the other heat shrinkage tube 241, and after the two heat shrinkage tubes 241 are closed, the plug pin 2421 is in plug-in fit with the jack.

When the heat shrinkage tube 241 is driven to rotate and close by the rotating shell 21, the plug 2421 on one heat shrinkage tube 241 is inserted into the insertion hole on the other heat shrinkage tube 241, so that the fixing of the heat shrinkage tube 241 can be realized, and the heat shrinkage tube 241 can be wrapped around the cable 3 after being shrunk.

Referring to fig. 3, 8 and 9: the melting device 27 includes a welder 271 and a gas tank 272; the welder 271 is disposed above a junction of the two sealed cases 23 in a closed state, the welder 271 being capable of fusion-connecting the junction; the gas tank 272 is provided at one side of the welder 271, the gas storage pipe communicates with the welder 271, and the gas tank 272 supplies fuel to the welder 271.

Since the two melting devices 27 are provided, when the rotating housing 21 is closed, the melting device 27 is started, the welding device 271 is ignited, the gas storage tube supplies fuel to the welding device 271, and it is noted that the fuel in the gas tank 272 needs to be fuel which can burn in water, otherwise, the situation that the joint of the sealing housing 23 cannot be melted occurs.

Referring to fig. 3 and 5: the sealing device 2 further comprises a connecting device 233, the connecting device 233 comprising a reversing valve 2331 and a switching valve 2332; the switch valve 2332 is provided between the air supply device 25 and the rotary case 21; the drain valve 231 is provided with a reversing valve 2331, and the reversing valve 2331 is connected to the liquid supply device 26.

When the rotating shell 21 is closed, the sealing shell 23 is also closed, the two closed sealing shells 23 form a sealed cavity, seawater is still stored in the cavity, if the repairing liquid is pumped into the cavity directly through the liquid supply device 26, the repairing liquid and the seawater are mixed, and then the repairing function of the repairing liquid is reduced, so that the seawater is required to be discharged firstly, the liquid supply device 25 is required to be started before the liquid supply device 26, the switch valve 2332 is in an open state, the liquid supply device 25 is started, the gas is pumped into the cavity by the gas supply device 25, the seawater in the cavity is discharged through the liquid discharge valve 231, the reversing valve 2331 is arranged on the liquid discharge valve 231, the liquid discharge valve 231 is communicated with the external seawater, the seawater in the cavity can be smoothly discharged, then the reversing valve 2331 is switched to the liquid supply device 26, the liquid supply device 26 stops running, the repairing liquid is pumped into the cavity through the reversing valve 2331, and the air in the cavity can be reentered into the liquid supply device 25 through the switch valve 2332, and the repairing effect of the repairing liquid supplied by the liquid supply device 26 is ensured.

Referring to fig. 5: the drain valve 231 is located below the switch valve 2332.

The drain valve 231 is disposed below the switch valve 2332, because the air supply device 25 will operate prior to the liquid supply device 26, so that the air supply device 25 supplies air to the cavity formed by the two seal shells 23 through the switch valve 2332, and the air will be located at the upper part of the cavity after entering the cavity, and the drain valve 231 is disposed below the rotating shell 21, so that the seawater in the cavity can be smoothly discharged, and meanwhile, a large amount of air will not overflow, because the pressure is great in the deep sea, the air is inconvenient to carry, and the waste of the air needs to be reduced. After the seawater in the cavity is completely discharged, the liquid supply device 26 is started, the repairing liquid supplied by the liquid supply device 26 enters the cavity through the liquid discharge valve 231, the density of the repairing liquid is higher than that of the air, the repairing liquid also gradually rises from the bottom of the cavity, and the air can flow into the air supply device 25 again through the switch valve 2332.

Referring to fig. 5 and 8: the sealing device 2 further includes an air supply device 25, and the air supply device 25 includes an air tank 251 and a sliding plate 252; the gas storage tank 251 is arranged at one side of the switch valve 2332, the gas storage pipe is communicated with the switch valve 2332, a first pump body is arranged at one side of the gas storage tank 251 close to the switch valve 2332, and a through hole is formed in the bottom of the gas storage tank 251; the sliding plate 252 is slidably disposed in the air storage tube along the axis of the through hole, and the sliding plate 252, the first pump body and the air storage tube 251 form an air storage chamber.

Because the equipment needs to be operated in deep sea, the pressure of the deep sea is huge, if sealed bottled gas is directly adopted to descend the sea, the high requirement on the tightness of the bottle body is needed, the compression resistance of the bottle body is high, otherwise the situation of pressure explosion occurs, through holes are formed in the bottom of the air storage tank 251, a sliding plate 252 capable of sliding is arranged in the air storage tank 251, the tank body of the air storage tank 251 cannot bear the pressure of seawater, after the air storage tank 251 descends along with the equipment, the pressure of the seawater can be continuously increased, at the moment, the continuously enhanced pressure of the seawater can push the sliding plate 252, the sliding plate 252 slides in the air storage tank 251, and because the sliding plate 252, the air storage tank 251 and the first pump body form a gas storage cavity, air can be extruded when the sliding plate 252 slides, the extruded air can generate the same pressure on the inner wall of the air storage tank 251, and the pressure on two sides of the air storage tank 251 is the same, so that the tank body cannot be crushed.

Referring to fig. 3 and 8: the liquid supply device 26 comprises an elastic sleeve 261; one end of the elastic sleeve 261 is provided with an opening, the elastic sleeve 261 is made of elastic materials, repairing liquid is stored in the elastic sleeve 261, one end of the elastic sleeve 261 provided with the opening is communicated with the reversing valve 2331, and a second pump body is arranged between the elastic sleeve 261 and the reversing valve 2331.

Because the liquid supply device 26 supplies the repairing liquid, if the traditional canning is adopted, the sealing requirement of the tank body is higher, and after the repairing liquid is filled into the elastic sleeve 261, the elastic sleeve 261 is arranged between the seawater and the repairing liquid, the elastic sleeve 261 has elasticity, and along with the increase of the submergence depth, the pressure of the seawater on the elastic sleeve 261 is basically the same as the reverse pressure of the repairing liquid on the elastic sleeve 261, so that the situation that the repairing liquid leaks when the liquid supply device 26 submerges is ensured.

Referring to fig. 3 and 4: the driving device 22 includes a rotary driver 221, a first gear 222, a second gear 223, and a hoist frame 224; the hoisting frame 224 is fixedly arranged in the bracket 1; the rotary driver 221 is provided on the hoist frame 224 along the axis of the rotary case 21; the first gear 222 is fixedly disposed on the output end of the rotary driver 221; the second gears 223 are provided in two, the two second gears 223 are fixedly provided at the same side ends of the two rotation cases 21, the two second gears 223 are engaged with each other, and the first gear 222 is engaged with one of the second gears 223.

When the bracket 1 frames the cable 3, the rotary driver 221 is started, the rotary driver 221 drives the first gear 222 arranged on the output end of the rotary driver to rotate, and as the first gear 222 is meshed with one of the second gears 223 and the two second gears 223 are meshed with each other, after the first gear 222 drives one of the second gears 223 to rotate, the two second gears 223 synchronously rotate, so that the two rotating shells 21 are driven by the two second gears 223 to rotate oppositely or reversely, and the two rotating shells 21 are closed and separated.

Referring to fig. 2: the rotary shell 21 can be electrified to generate magnetism.

Because the seal shell 23 is adsorbed on the rotating shell 21 through the first magnet 232, and the attraction force of the first magnet 232 is limited, when the rotating shell 21 is electrified and magnetically generated, the first magnet 232 can be adsorbed on the rotating shell 21 more tightly, and the sealing plate can not fall off in the submergence process of equipment.

The foregoing examples merely illustrate one or more embodiments of the invention, which are described in greater detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (10)

1. The power cable repair operation method is characterized in that the method is implemented by power cable repair equipment, the power cable repair equipment comprises a bracket (1), a sealing device (2) and a submersible, the sealing device (2) comprises a rotating shell (21), a driving device (22), a sealing shell (23), a liquid discharge valve (231), a first magnet (232), a gas supply device (25), a liquid supply device (26) and a melting device (27);

the two rotating shells (21) are symmetrically arranged in the bracket (1) along the length direction of the bracket (1);

the driving device (22) is arranged at one side of the rotating shell (21);

the sealing shell (23) is arranged in the rotating shell (21);

the liquid discharge valve (231) is arranged on the side wall of one of the rotating shells (21);

the first magnet (232) is fixedly arranged on the side wall of the sealing shell (23);

the air supply device (25) is arranged on the side wall of one of the rotating shells (21);

a liquid supply device (26) for supplying the repair liquid is arranged at one side of the liquid discharge valve (231);

since the fusing device (27) fusing the junction of the two seal cases (27) is provided on the rotating case (21),

the specific operation steps are as follows:

s1, the bracket (1) moves to the position above a broken cable (3) under the drive of the submersible, and then the submersible drives the bracket (1) to descend so that the bracket (1) covers the cable (3);

s2, the driving device (22) drives the two rotating shells (21) to rotate and close, and the sealing shell (23) is attached to the rotating shells (21) through the suction force of the first magnet (232) and synchronously rotates along with the rotating shells (21);

s3, after the two sealing shells (23) are closed, starting a melting device (27), wherein the melting device (27) melts and connects the joint between the two sealing shells (23), then starting an air supply device (25), pumping air into the sealing shells (23) by the air supply device (25), and discharging seawater in the sealing shells (23) through a liquid discharge valve (231);

s4, then the air supply device (25) is stopped, the liquid supply device (26) is started, the liquid supply device (26) pumps the repairing liquid into the rotating shells (21), and the driving device (22) drives the two rotating shells (21) to be separated after the repairing liquid is solidified.

2. A power cable repair operation method according to claim 1, characterized in that the end seal assembly (24) comprises a heat shrink tube (241), a fixing device (242), a heater (243) and a second magnet (244);

the heat shrinkage tube (241) is of a semicircular structure, the heat shrinkage tube (241) is fixedly arranged at two ends of the self-sealing shell (23), the axis of the heat shrinkage tube (241) is collinear with the axis of the sealing shell (23), and the diameter of the heat shrinkage tube (241) is larger than that of the cable (3);

the fixing devices (242) are respectively arranged on the heat shrinkage pipes (241) at the same side end parts of the two sealing shells (23), and the fixing devices (242) have a fixing effect on the heat shrinkage pipes (241);

the heater (243) is arranged on one side of the heat shrinkage tube (241), and the heater (243) can heat the heat shrinkage tube (241);

the second magnet (244) is fixedly arranged on the outer side of one end of the heat shrinkage tube (241), and the second magnet (244) is adsorbed on the rotating shell (21).

3. A power cable repair operation method according to claim 2, characterized in that the fixing means (242) comprises a plug (2421) and a socket;

the bolt (2421) is fixedly arranged on one of the heat shrinkage pipes (241);

the jack is arranged on the other heat shrinkage tube (241), and after the two heat shrinkage tubes (241) are closed, the bolt (2421) is in plug-in fit with the jack.

4. A power cable repair operation method according to claim 1, wherein the melting device (27) includes a fusion splicer (271) and a gas tank (272);

the welding device (271) is arranged above the joint of the two sealing shells (23) in a closed state, and the welding device (271) can perform fusion connection on the joint;

a gas tank (272) is provided on one side of the welder (271), a gas storage pipe communicates with the welder (271), and the gas tank (272) supplies fuel to the welder (271).

5. A power cable repair operation method according to claim 1, characterized in that the sealing device (2) further comprises a connecting device (233), the connecting device (233) comprising a reversing valve (2331) and a switching valve (2332);

the switch valve (2332) is arranged between the air supply device (25) and the rotating shell (21);

the reversing valve (2331) is arranged on the liquid discharge valve (231), and the reversing valve (2331) is connected with the liquid supply device (26).

6. The power cable repair operation method according to claim 5, wherein the drain valve (231) is located below the on-off valve (2332).

7. A power cable repair operation method according to claim 1, wherein the sealing device (2) further comprises an air supply device (25), the air supply device (25) comprising an air tank (251) and a sliding plate (252);

the air storage tank (251) is arranged at one side of the switch valve (2332), the air storage pipe is communicated with the switch valve (2332), a first pump body is arranged at one side of the air storage tank (251) close to the switch valve (2332), and a through hole is formed in the bottom of the air storage tank (251);

the sliding plate (252) is arranged in the gas storage tube in a sliding mode along the axis of the through hole, and the sliding plate (252), the first pump body and the gas storage tank (251) form a gas storage cavity.

8. A power cable repair operation method according to claim 1, characterized in that the liquid supply means (26) comprises an elastic sheath (261);

one end of the elastic sleeve (261) is provided with an opening, the elastic sleeve (261) is made of elastic materials, repair liquid is stored in the elastic sleeve (261), one end of the elastic sleeve (261) provided with the opening is communicated with the reversing valve (2331), and a second pump body is arranged between the elastic sleeve (261) and the reversing valve (2331).

9. A power cable repair operation method according to claim 1, characterized in that the driving device (22) comprises a rotary drive (221), a first gear (222), a second gear (223) and a hoisting frame (224);

the hoisting frame (224) is fixedly arranged in the bracket (1);

the rotary driver (221) is arranged on the lifting frame (224) along the axis of the rotary shell (21);

the first gear (222) is fixedly arranged on the output end of the rotary driver (221);

the two second gears (223) are arranged, the two second gears (223) are respectively and fixedly arranged at the same side end parts of the two rotating shells (21), the two second gears (223) are meshed with each other, and the first gear (222) is meshed with one of the second gears (223).

10. A power cable repair operation method according to claim 1, characterized in that the rotating housing (21) is energizable and magnetically active.