CN218732369U

CN218732369U - Braiding device

Info

Publication number: CN218732369U
Application number: CN202221966786.9U
Authority: CN
Inventors: 森义和; 大仓雅志; 高桥良辅
Original assignee: Sumitomo Electric Industries Ltd
Current assignee: Sumitomo Electric Industries Ltd
Priority date: 2021-10-28
Filing date: 2022-07-28
Publication date: 2023-03-24
Anticipated expiration: 2032-07-28
Also published as: JP2023065810A

Abstract

The braiding apparatus automatically and stably forms at least 1 layer of the cable connection part by the ribbon. The braiding device comprises: a pair of cable clamps which respectively hold the pair of power cables; a tape holder that holds a tape roll having a tape on an outer side in a radial direction of the power cable; a tape conveying mechanism that conveys the tape from the tape roll toward an outer periphery of the power cable; a rotating mechanism that rotates the tape holder and the tape feeding mechanism in the circumferential direction of the power cable and winds the tape around the outer periphery of the power cable; and a moving mechanism which moves the tape holder, the tape feeding mechanism, and the rotating mechanism in the axial direction of the power cable between the pair of cable holders.

Description

Braiding device

Technical Field

The utility model relates to a braid device.

Background

In the case of manufacturing a power cable laid over a long distance, a plurality of power cables are connected in a factory to manufacture a connected power cable having a desired distance. The cable connection portion in this case is called a "Factory Joint" (e.g., patent document 1).

Patent document 1: japanese patent laid-open publication No. 9-56039

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an automatic and form 1 at least layer of cable junction portion steadily through the area.

According to an aspect of the present invention, there is provided a braid device, comprising:

a pair of cable clamps which respectively hold the pair of power cables;

a tape holder that holds a tape roll having a tape on an outer side in a radial direction of the power cable;

a tape conveying mechanism that conveys the tape from the tape roll toward an outer periphery of the power cable;

a rotating mechanism that rotates the tape holder and the tape feeding mechanism in a circumferential direction of the power cable and winds the tape around an outer periphery of the power cable; and

and a moving mechanism that moves the tape holder, the tape feeding mechanism, and the rotating mechanism in an axial direction of the power cable between the pair of cable clamps.

Effect of the utility model

According to the utility model discloses, can form cable junction's at least 1 layer automatically and stably through the area.

Drawings

Fig. 1 is a schematic cross-sectional view showing a cable connection portion according to an embodiment of the present invention.

Fig. 2 is a schematic enlarged view of a front end portion of the power cable of fig. 1.

Fig. 3 is a schematic enlarged view of a welded portion of the metal pipe of fig. 1.

Fig. 4 is a schematic view showing a braiding apparatus according to an embodiment of the present invention.

Fig. 5 is an enlarged view of a part of fig. 4 as viewed in the axial direction of the power cable.

Fig. 6 is a flowchart showing a method for manufacturing a connected power cable according to an embodiment of the present invention.

Fig. 7 is a flowchart showing an insulating layer forming step.

Fig. 8 is a schematic view showing a conductor connecting step.

FIG. 9 is a schematic view showing a crosslinking step.

Detailed Description

[ description of embodiments of the present invention ]

< findings obtained by the inventors et al >

First, the findings obtained by the inventors and the like will be described.

(i) Insights relating to cable connections

As described above, the power cable laid over a long distance includes, for example, a submarine cable (submarine cable). The power cables constituting the submarine cable can be manufactured only in a limited length based on the manufacturing capability of the factory. Therefore, a plurality of power cables are connected in a factory as described above, and a connection power cable having a desired length is manufactured as a submarine cable. Then, the connection power cable is loaded on the laying vessel.

The connecting power cable described above is subjected to bending stress when wound around a turntable, transported, paid out, laid, and the like. Therefore, the connection power cable is required to have flexibility, for example. Therefore, the outermost diameter of the cable connection portion is desirably substantially the same as the outermost diameter of the power cable.

The connection power cable receives a tensile force during paying-off and laying or during a power flow after laying. Therefore, for example, tensile strength is required for connecting the power cables. Therefore, it is desirable that the connection strength between the power cables of the cable connection portion is high.

When the connection power cable is laid on the seabed, for example, the cable connection portion may be immersed in water to corrode a conductor or the like. Therefore, the connection power cable is required to have, for example, water resistance (water resistance). Therefore, the cable connection portion is desired to have high sealing performance.

(ii) Insights about layers constituting a cable connection

In the cable connection portion, the conductors are connected to each other in a state where the pair of power cables are peeled off in a stepwise manner. Therefore, it is required to form each layer constituting the cable connection portion in conformity with the complicated outer shape of the inner layer.

Therefore, the present inventors have studied, for example, an insulating layer forming a cable connection portion by a tape. This makes it possible to stably form the insulating layer in accordance with the complicated outer shape of the layer on the inner side of the insulating layer.

However, in order to form an insulating layer of the cable connection portion, the tape must be wound around the outer periphery of the power cable a plurality of times. Therefore, in the method in which the operator winds the tape with his or her hand, the working time becomes long, or the burden on the operator increases. Further, the winding state of the belt may fluctuate depending on the operator. Therefore, a braiding apparatus capable of automatically and stably forming at least 1 layer of the cable connection portion by a braid is desired.

Further, the present inventors have studied a structure in which a tape is wound in a circumferential direction of a power cable as the braiding apparatus based on the necessity of the automatic braiding apparatus.

However, in the configuration in which the tape is wound around the power cable in the circumferential direction, the whole braiding apparatus including the rotating mechanism may become too large. Therefore, there is a possibility that the apparatus cost increases, or the apparatus space expands.

The present invention has been made based on the findings (i) and (ii) found by the present inventors.

< implementation of the present invention >

Next, embodiments of the present invention will be described.

[1] The utility model discloses a braid device that one mode relates to has:

a pair of cable clamps which respectively hold the pair of power cables;

According to this structure, at least 1 layer of the cable connection portion can be automatically and stably formed by the tape.

[2] The braiding apparatus according to the above [1],

the tape holder holds the tape holder so that the axis of the tape reel faces a direction intersecting the axis of the power cable.

With this configuration, the braiding apparatus can be prevented from becoming excessively large.

[3] The braiding apparatus according to the above [1] or [2],

the belt holding rack is provided in a plurality of numbers,

the belt conveying mechanism is provided in plurality in the same number as the belt holders,

the rotating mechanism is configured to rotate the plurality of tape holders and the plurality of tape feeding mechanisms in a circumferential direction of the power cable, and wind a plurality of tapes around an outer periphery of the power cable.

According to this structure, a layer that requires the tape to be wound a plurality of times can be formed quickly.

[4] The braiding apparatus according to any one of items [1] to [3],

the tape holder is configured to apply a frictional force to the tape roll, the frictional force being capable of suppressing rotation of the tape roll.

With this configuration, the tension of the belt can be easily adjusted.

[5] In a method for manufacturing a connected power cable according to another aspect of the present disclosure,

comprises the following steps:

preparing a plurality of power cables; and

forming at least 1 cable connection part connecting a pair of power cables among the plurality of power cables,

the step of forming the cable connection portion includes a step of forming an insulating layer by winding tapes around the outer peripheries of the pair of power cables using a taping device,

in the step of forming the insulating layer, the insulating layer is formed,

as the braiding apparatus, the following apparatus is used, which includes:

a pair of cable clamps that grip the pair of power cables, respectively;

a tape holder that holds a tape roll having the tape on an outer side in a radial direction of the power cable;

[ details of the embodiment of the present invention ]

Next, an embodiment of the present invention will be described below with reference to the drawings. The present invention is not limited to these examples, but is defined by the claims, and includes all modifications equivalent to the claims and within the scope thereof.

< one embodiment of the present invention >

(1) Connecting power cable and cable connecting part

A connection power cable 10 and a cable connection portion (cable connection structure) 20 according to an embodiment of the present invention will be described with reference to fig. 1 to 3. Fig. 1 is a schematic cross-sectional view showing a cable connection portion according to the present embodiment. Fig. 2 is a schematic enlarged view of a front end portion of the power cable of fig. 1. Fig. 3 is a schematic enlarged view of a welded portion of the metal pipe of fig. 1.

Further, in fig. 1, the power cable 100 shows a side surface after delamination. Fig. 1 to 3 are schematic views, and therefore the thickness, interval, shape, and the like of each portion shown in each drawing may differ from the actual shape. The lower side of each of fig. 1 to 3 is omitted.

As shown in fig. 1, the connection power cable 10 of the present embodiment is configured as a submarine cable laid on the ground (seabed), and includes a plurality of power cables 100 and at least 1 cable connection unit 20.

In the following, the "axial direction" of power cable 100 or the like means a direction along the central axis of power cable 100 or the like, and can be in other words, a longitudinal direction of power cable 100 or the like. The "radial direction" of power cable 100 or the like means a direction perpendicular to the axial direction of power cable 100 or the like, and may be in other words, a width direction of power cable 100 or the like in some cases. The "circumferential direction" of power cable 100 and the like means a direction along the outer periphery of power cable 100 and the like.

[ Power Cable ]

Power cable 100 is a solid insulated cable (also referred to as a CE cable) which is a high-voltage power transmission cable (e.g., a cross-linked Polyethylene (PE) insulated XLPE cable).

The power cable 100 includes, for example, a conductor 110, a cable inner semiconductive layer 120, a cable insulating layer 130, a cable outer semiconductive layer 140, a water absorbing layer (not shown), a cable metal tube 150, and a cable jacket 160 from a center axis side toward an outer circumferential side. In addition, a portion of the power cable 100 from the conductor 110 to the cable outer semiconductive layer 140 may be referred to as a "cable core".

The conductor 110 is omitted in fig. 1 and 2, for example, but includes a plurality of conductor wire layers 114 obtained by twisting a plurality of conductor wires 112 into a spiral shape. The conductor wire 112 is made of, for example, copper, a copper alloy, aluminum, or an aluminum alloy.

Power cable 100 is peeled stepwise from the tip of conductor 110 toward the opposite side (so-called "delamination"). That is, the conductor 110, the cable inner semiconductive layer 120, the cable insulation layer 130, the cable outer semiconductive layer 140, the cable metal pipe 150, and the cable jacket 160 are exposed in this order from the tip side of the conductor 110 toward the opposite side. Hereinafter, each portion after the delamination is sometimes referred to as an "exposed portion". With the above-described configuration, power cables 100 can be connected to each other in order from the central axis side toward the outer peripheral side.

The conductor 110, the cable inner semiconductive layer 120, the cable insulation layer 130, the cable outer semiconductive layer 140, and the cable metal pipe 150 are obliquely cut with respect to the axis of the conductor 110. In other words, power cable 100 is formed into a pencil shape, for example, and has a conical peeling surface (reference numeral not shown) whose diameter is increased from the tip of conductor 110 toward the opposite side.

Here, as shown in fig. 2, the cable insulating layer 130 has a peeling surface inclined at a predetermined taper angle θ with respect to the axis of the conductor 110, for example. The taper angle θ of the peeling surface of the cable insulation layer 130 is, for example, 5.2 ° to 8.6 ° with respect to the axis of the conductor 110. By setting the taper angle θ to 5.2 ° or more, the length of the cable connection portion 20 in the axial direction of the conductor 110 can be suppressed from becoming excessively long. On the other hand, by setting the taper angle θ to 8.6 ° or less, the electric field around the exposed cable insulation layer 130 can be relaxed, and workability can be ensured.

As shown in fig. 1, the power cable 100 is provided in plurality. A pair of power cables 100 among the plurality of power cables 100 have their conductors 110 axis-aligned and butted against each other. In the following description, 1 power cable 100 out of the pair of power cables 100 may be referred to as "1 st power cable 100a", and the other 1 power cable 100 may be referred to as "2 nd power cable 100b".

[ Cable connection part ]

As shown in fig. 1, the cable connection portion 20 includes, for example, a conductor connection portion 210, an inner semiconductive layer 220, an insulating layer 230, an outer semiconductive layer 240, a water absorbing tape layer 242, a metal pipe (protective pipe) 250, and an anti-corrosion layer (connection portion sheath) 260.

(conductor connecting part)

Conductors 110 of each of the pair of power cables 100 are connected to conductor connection portion 210. The point at which the pair of conductors 110 is connected is also referred to as a "connection point". The conductor connecting portion 210 includes, for example, an exposed portion (not shown) of the pair of conductors 110 and a welding portion 212.

Although the details of the conductor connection step will be described later, in the welding portion 212 of the conductor connection portion 210 according to the present embodiment, the conductors 110 are directly welded to each other in a state where, for example, no metal cylinder (so-called conductor sleeve) is provided on the outer periphery of the conductor 110. As described later, the plurality of conductor wires 112 are welded to each of the plurality of conductor wire layers 114 of the conductor 110 in the welded portion 212. The conductor connecting portion 210 is compressed in the radial direction of the conductor 110, for example. With the structure described above, the outer diameter of the conductor connecting portion 210 is substantially equal to the outer diameter of the conductor 110 of the power cable 100.

(inner semi-conducting layer)

As shown in fig. 1 and 2, the inner semiconductive layer 220 covers the outer periphery of the conductor connection portion 210. The inner semiconductive layer 220 has semiconductivity. This can alleviate electric field concentration near the surface of the conductor connecting portion 210.

In the present embodiment, the inner semiconductive layer 220 is formed of, for example, a semiconductive tape wound around the outer periphery of the conductor connecting portion 210. The semiconductive tape is a tape made of, for example, nylon coated with a semiconductive rubber, teflon (registered trademark), or the like, or a tape made of the same semiconductive resin material as the cable inner semiconductive layer 120 of the power cable 100 and having a crosslinking agent, and is crosslinked through a crosslinking step described later. By forming the inner semiconductive layer 220 from the semiconductive tape as described above, the inner semiconductive layer 220 can be formed to match the shape and length of the conductor connecting portion 210.

(insulating layer)

As shown in fig. 1, the insulating layer 230 is provided to cover the outer periphery of the inner semiconductive layer 220. The insulating layer 230 has insulating properties. This ensures insulation outside the conductor connecting portion 210.

In the present embodiment, the insulating layer 230 covers, for example, exposed portions of the inner semiconductive layer 220 and the cable insulating layer 130. The insulating layer 230 has, for example, a conical surface whose diameter increases from an end of the insulating layer 230 in the axial direction of the conductor 110 toward the center.

In the present embodiment, the insulating layer 230 is formed of, for example, an insulating tape wound around the outer periphery of the exposed portions of the inner semiconductive layer 220 and the cable insulating layer 130. The insulating tape is, for example, a tape made of the same insulating resin material as the cable insulating layer 130 of the power cable 100 and having a crosslinking agent, and is crosslinked through a crosslinking step described later. By forming the insulating layer 230 with the insulating tape as described above, the insulating layer 230 can be formed to match the complex outer shape of the exposed portions of the inner semiconductive layer 220 and the cable insulating layer 130.

The insulating layer 230 is formed of an insulating tape 232 using a below-described braiding device 40. This content will be described in detail later.

(outer semi-conducting layer)

As shown in fig. 1, the outer semiconductive layer 240 is provided to cover the outer periphery of the insulating layer 230. The outer semiconductive layer 240 has semiconductivity. This can alleviate the electric field concentration in the vicinity of the outer side of the insulating layer 230.

In the present embodiment, the outer semiconductive layer 240 is formed of, for example, a semiconductive pipe that covers the outer periphery of the cable insulating layer 130. Examples of the material of the semiconductive pipe include a resin material containing carbon black or the like. In addition, the semiconductive tube has heat shrinkability. In addition, the semiconductive pipe is crosslinked by a method such as electron beam irradiation in the production of the semiconductive pipe, but is welded to an insulating layer and integrated by a crosslinking step described later. By forming the outer semiconductive layer 240 with the semiconductive pipe as described above, the surface of the outer semiconductive layer 240 can be smoothed even if the layer on the inner side of the outer semiconductive layer 240 is formed of a tape.

In this embodiment, the outer semiconductive layer 240 covers the outer periphery of the insulating layer 230 and contacts the exposed end of the cable outer semiconductive layer 140. Thereby, the outer semiconductive layer 240 becomes electrically equal in potential to the cable outer semiconductive layer 140.

(Water-absorbent tape layer)

As shown in fig. 1, the water-absorbing belt layer 242 is preferably provided so as to cover the outer periphery of the outer semiconductive layer 240, that is, between the outer semiconductive layer 240 and a metal pipe 250 described later. The water-absorbent tape layer 242 is configured similarly to the water-absorbent layer of the power cable 100, and is, for example, a tape obtained by coating a polyester base fabric with a semiconductive rubber and adhering a water-absorbent polymer. By providing the water absorbent tape layer 242 as described above, even if water intrudes into the metal pipe 250, water conduction (i.e., water running) can be suppressed.

(Metal tube)

As shown in fig. 1, the metal pipe 250 is provided to cover the outer circumference of the outer semiconductive layer 240 (water-absorbing belt layer 242). The metal pipe 250 is made of a metal having rigidity. Examples of the metal constituting the metal tube 250 include lead and aluminum. By providing the metal pipe 250 as described above, the impact resistance of the cable connection portion 20 can be improved.

In the present embodiment, the metal tube 250 is constricted so as to be in contact with the outer peripheral surface of the layer located inside the metal tube 250 (i.e., the water-absorbing tape layer 242). Therefore, the metal pipe 250 has a trace of diameter reduction, for example. With the above configuration, the outermost diameter of the cable connection portion 20 can be reduced.

As shown in fig. 3, an axial end of the metal tube 250 and an axial end of the cable metal tube 150 are welded by a weld 252. This can suppress the water immersion between the metal pipe 250 and the cable metal pipe 150, and can make them electrically equipotential.

In the present embodiment, a heat insulating portion 244 having heat insulation is preferably provided between the welding portion 252 and the cable outer semiconductive layer 140. This can suppress thermal degradation of the cable core when the welding portion 252 is welded.

In the present embodiment, the reinforcing portion 254 is provided so as to cover the outer periphery of the welded portion 252. Specifically, the reinforcing portion 254 includes, for example, epoxy resin, a glass tape impregnated with epoxy resin, and an adhesive PET (Polyethylene Terephthalate) tape covering them. This can suppress the occurrence of cracks at the end of welded portion 252.

(anti-corrosion layer)

As shown in fig. 1, the corrosion prevention layer 260 is provided to cover the outer periphery of the metal tube 250 and the exposed portion of the cable metal tube 150. The corrosion prevention layer 260 is made of a resin having corrosion resistance. Examples of the resin having corrosion resistance include a polyethylene mixture. This can suppress corrosion of the cable core.

In the present embodiment, the corrosion prevention layer 260 is formed of, for example, a tube that covers the outer periphery of the metal tube 250, the exposed portion of the cable metal tube 150, and a part of the outer periphery of the cable sheath 160. The outer circumference of the metal pipe 250 can be easily covered by the pipe of the corrosion prevention layer 260. Further, the outer peripheral surface of the corrosion prevention layer 260 can be smoothed.

The corrosion prevention layer 260 covers a part of the outer circumference of the cable sheath 160, and therefore has a bulge portion 260a on the outer circumference of the cable sheath 160. The swelling portion 260a can stably suppress the water immersion into the cable core.

In the present embodiment, the corrosion prevention layer 260 is provided with a plurality of layers in the radial direction of the conductor 110, for example. This can improve the corrosion resistance and reliability of the corrosion prevention layer 260.

Specifically, the 1 st anticorrosion layer 262 covers the outer periphery of the metal pipe 250, the exposed portion of the cable metal pipe 150, and a part of the outer periphery of the cable sheath 160. The 1 st anticorrosive portion 263 is provided to cover a step between the axial end portion of the 1 st anticorrosive layer 262 and the cable sheath 160. The 1 st anticorrosive part 263 is made of, for example, a Polyethylene (PE) tape that is melted by heating.

The 2 nd corrosion prevention layer 264 is provided to cover the outer periphery of the 1 st corrosion prevention layer 262, the 1 st corrosion prevention part 263, and a part of the outer periphery of the cable sheath 160. The 2 nd corrosion prevention part 265 is provided so as to cover a step between the axial end of the 2 nd corrosion prevention layer 264 and the cable sheath 160. The 2 nd corrosion prevention part 265 is, for example, a PE tape which is melted by heating.

With the above-described structure, the corrosion resistance and reliability of the corrosion prevention layer 260 can be improved.

As shown in fig. 1, in the present embodiment, it is preferable that a filling portion 256 is provided to fill a step between the exposed portion of the cable metal tube 150 and the cable sheath 160. The filling part 256 is made of, for example, an adhesive PE tape or an adhesive PET tape. Thereby, the corrosion prevention layer 260 can be smoothly coated between the exposed portion of the cable metal tube 150 and the cable sheath 160.

(cover part)

In the present embodiment, the cover portion 270 is preferably provided so as to cover an axial end portion (the 2 nd corrosion prevention portion 265) of the corrosion prevention layer 260. Cover 270 is made of, for example, an adhesive PE tape or an adhesive PET tape. This can smooth the irregularities near the end of the corrosion prevention layer 260 in the axial direction.

(others)

In the present embodiment, the connection power cable 10 preferably has a mark indicating the position of the cable connection unit 20. The mark is formed of, for example, a colored tape attached to the outer peripheral surface of the power cable 100 or the cable connection portion 20. The mark may be a pattern printed or applied on the outer circumferential surface of the power cable 100. The position of the mark may be both ends or the center of the cable connection unit 20. This allows the position of the cable connection portion 20 to be easily visually recognized.

(specific dimensions, etc.)

The outermost diameter of cable connection unit 20 in the present embodiment is substantially the same as the outermost diameter of power cable 100, for example. Specifically, the outermost diameter of the corrosion prevention layer 260 including the conductor connection portion 210 in a cross section perpendicular to the axis of the power cable 100 is, for example, +5mm or more and +15mm or less with respect to the outermost diameter of the power cable 100.

In the present embodiment, even at the position where the raised portion 260a of the corrosion prevention layer 260 is formed, the outermost diameter of the cable connection portion 20 is suppressed. Specifically, the outermost diameter of a cross section perpendicular to the axis of power cable 100 including bulge 260a is, for example, +5mm or more and +20mm or less with respect to the outermost diameter of power cable 100.

(2) Braiding device

Next, the braiding device 40 according to the present embodiment will be described with reference to fig. 4 and 5. Fig. 4 is a schematic view showing the braiding apparatus according to the present embodiment. Fig. 5 is an enlarged view of a part of fig. 4 as viewed in the axial direction of the power cable.

In the taping device 40, "the axial direction of the power cable 100" can be, in other words, "the extending direction of the power cable 100 gripped by the cable gripper 410" or "the insertion and insertion direction of the power cable 100 by the cable gripper 410".

The braiding device 40 according to the present embodiment is configured to form at least 1 layer constituting the cable connection portion 20 by winding a predetermined tape 232 around the outer periphery of the power cable 100, for example. Specifically, the braiding apparatus 40 is configured to form at least the insulating layer 230, for example, as described above.

As shown in fig. 4 and 5, the braiding device 40 of the present embodiment includes, for example, a cable holder 410, a tape holder 420, a tape conveying mechanism 430, a rotating mechanism 440, a moving mechanism 450, a support base 462, an elevating mechanism 464, a carriage 466, and a controller 490.

[ Cable clamp ]

As shown in fig. 4, the cable clamp 410 is provided with a pair, for example. The pair of cable clamps 410 (410 a, 410 b) is configured to grip the pair of power cables 100 (100 a, 100 b), respectively, for example.

The pair of power cables 100 held by the pair of cable clamps 410 are connected to each other in the state of being delaminated as described above, and the conductor connection portion 210 is formed. Further, the inner semiconductive layer 220 is provided so as to cover the outer periphery of the conductor connection portion 210.

Specifically, cable clamp 410 has, for example, an insertion hole (not shown) through which power cable 100 is inserted. The upper side and the lower side of the cable holder 410 are separated openably and closably in a cross section of the cable holder 410 including the insertion hole. The upper and lower sides of the cable clamp 410 are configured to be screw-fastened to each other in a state where the power cable 100 is inserted through the insertion hole. According to the structure described above, the power cable 100 can be gripped by the cable clamp 410.

[ with holder ]

As shown in fig. 4 and 5, the tape holder 420 is configured to hold the tape roll 234 having the tape 232 outside the power cable 100, for example.

The "tape 232" herein is, for example, an insulating tape constituting the insulating layer 230. The "tape roll 234" is a roll formed by winding the tape 232 a plurality of times.

Here, it is preferable to form the insulating layer 230 in conformity with a complicated outer shape of a layer on the inner side than the insulating layer 230, and thus the width of the tape 232 for the insulating layer 230 is shortened. Therefore, the number of times the tape 232 is wound with respect to the power cable 100 increases. As a result, the diameter of the tape roll 234 becomes larger, for example, larger than the width of the tape 232.

Therefore, in the present embodiment, the tape holder 420 is configured to hold the tape roll 234 so as to face a direction in which the axis of the tape roll 234 intersects with the axis of the power cable 100, for example. The tape holder 420 preferably holds the tape roll 234 such that the axis of the tape roll 234 is oriented in a direction orthogonal to the axis of the power cable 100, for example. Thus, even if the diameter of the tape roll 234 is large, the braiding device 40 can be suppressed from becoming excessively large.

In the present embodiment, the tape holder 420 is configured to be able to apply a frictional force that suppresses rotation of the tape roll 234 to the tape roll 234, for example. Specifically, the tape holder 420 has, for example, a countersunk head screw that applies a frictional force to the inner circumferential surface of the cylindrical core of the tape roll 234. This makes it possible to easily adjust the tension of the belt 232.

[ Belt conveying mechanism ]

As shown in fig. 4 and 5, the tape feeding mechanism 430 is configured to feed (send) the tape 232 from the tape roll 234 toward the outer periphery of the power cable 100, for example.

Specifically, as shown in fig. 5, the tape conveying mechanism 430 includes, for example, a plurality of conveying rollers for changing the conveying direction of the tape 232 from the tape roll 234. The plurality of transport rollers include, for example, a 1 st transport roller 432 and a 2 nd transport roller 434.

The 1 st conveying roller 432 has, for example, a 1 st rotation shaft 433 along the axis of the tape roll 234 held by the tape holder 420. The 1 st conveying roller 432 is disposed between the tape roll 234 held by the tape holder 420 and the power cable 100, for example. Further, the 1 st rotation shaft 433 of the 1 st transport roller 432 is preferably arranged so as to overlap and be parallel to the axis of the tape roll 234 held by the tape holder 420, for example, when viewed from the axial direction of the power cable 100.

The 2 nd conveying roller 434 has, for example, a 2 nd rotation shaft 435 along the axis of the power cable 100. The 2 nd conveying roller 434 is disposed at a position not interfering with the 1 st conveying roller 432, for example, on the outer side in the radial direction of the power cable 100. Further, the 2 nd rotation shaft 435 of the 2 nd conveying roller 434 is preferably arranged parallel to the axis of the power cable 100, for example.

The tape transport mechanism 430 is configured to twist the tape 232 between, for example, the 1 st transport roller 432 and the 2 nd transport roller 434, and to change the width direction of the tape 232 from the direction along the axis of the tape roll 234 to the direction along the axis of the power cable 100.

Further, the 2 nd conveying roller 434 may be provided in plurality, for example.

[ arrangement of plural ]

In the present embodiment, a plurality of the band holders 420 are provided. In addition, the belt conveying mechanism 430 is provided in plural in the same number as the belt holder 420.

Specifically, the band holder 420 is provided with 2 pieces, for example. The 2 band holders 420 are referred to as "

band holders

420a, 420b". In addition, the belt conveying mechanism 430 is also provided with 2, for example. The 2 belt conveying mechanisms 430 are set as "

belt conveying mechanisms

430a, 430b". The belt conveying mechanism 430a is configured to convey the belt 232 from the belt holder 420a, and the belt conveying mechanism 430b has the same components as the belt conveying mechanism 430a and conveys the belt 232 from the belt holder 420 b.

[ rotating mechanism ]

As shown in fig. 4 and 5, rotation mechanism 440 is configured to rotate tape holder 420 and tape feed mechanism 430 in the circumferential direction of power cable 100 (for example, in the direction of the thick arrow in the drawing) to wind tape 232 around the outer periphery of power cable 100. Further, for example, rotating mechanism 440 rotates belt holder 420 and belt feeding mechanism 430 in the circumferential direction of power cable 100 while maintaining their relative positional relationship.

Specifically, the rotating mechanism 440 includes, for example, a rotary cylinder 442 and a motor 444.

The rotary cylinder 442 has, for example, a hollow portion (not shown) through which the power cable 100 is inserted. Further, for example, rotary cylinder 442 is configured to hold tape holder 420 and tape feed mechanism 430 radially outward of power cable 100 and to be rotatable in the circumferential direction of power cable 100. More specifically, the rotary cylinder 442 holds the band holder 420 on, for example, the outer peripheral side of the rotary cylinder 442, and holds the band holder 420 on the 1 st end side in the axial direction of the rotary cylinder 442. The rotary cylinder 442 includes, for example, a gear 442g provided over the outer periphery of the 2 nd end side in the axial direction of the rotary cylinder 442.

The rotary cylinder 442 is divided into a hollow portion along the axial direction of the rotary cylinder 442 so as to be openable and closable, for example. This allows power cable 100 to be easily inserted into and inserted through the hollow portion of rotary cylinder 442.

The motor 444 is configured to rotate the rotary cylinder 442 by meshing with the gear 442g of the rotary cylinder 442, for example. The motor 444 is connected to a controller 490 described later, for example.

In the present embodiment, for example, the rotating mechanism 440 is configured to rotate the plurality of tape holders 420 and the plurality of tape feeding mechanisms 430 in the circumferential direction of the power cable 100, thereby winding the plurality of tapes 232 around the outer circumference of the power cable 100. Further, for example, rotating mechanism 440 rotates belt holders 420 and belt feeding mechanisms 430 in the circumferential direction of power cable 100 while maintaining their relative positional relationship. With the above-described configuration, the plurality of tapes 232 can be wound simultaneously, or at least a part of the plurality of tapes 232 can be wound so as to overlap each other (so-called lap winding).

[ moving mechanism ]

As shown in fig. 4, moving mechanism 450 is configured to move tape holder 420, tape feeding mechanism 430, and rotating mechanism 440 in the axial direction of power cable 100, for example, between a pair of cable clamps 410.

Specifically, the moving mechanism 450 is configured as a so-called linear guide, and includes, for example, a rail 452, a ball screw (not shown), a ball screw motor (not shown), and a block 454.

The rail 452 and the ball screw are provided, for example, in the axial direction of the power cable 100 gripped by the pair of cable grippers 410. For example, a ball screw is disposed between the pair of rails 452. The ball screw motor is configured to rotate the ball screw in a circumferential direction of the ball screw. The block 454 is configured to be screwed with a ball screw, and linearly moves along the rail 452 by the rotation of the ball screw in the circumferential direction. At least the rotating mechanism 440 described above is fixed to the block 454. According to the above-described configuration, by moving block 454 of moving mechanism 450 along rail 452, belt feeding mechanism 430 and rotating mechanism 440 can be moved in the axial direction of power cable 100.

[ Structure under device ]

As shown in fig. 4, the support base 462 is configured to support at least one pair of the cable holder 410 and the moving mechanism 450, for example. The elevating mechanism 464 is configured to, for example, elevate and lower the support base 462 in the vertical direction. By raising braiding apparatus 40 from the vertically lower side of power cable 100, braiding apparatus 40 can easily install power cable 100.

The carriage 466 is configured to be movable in a state where the elevating mechanism 464 is mounted, for example.

This enables the braiding apparatus 40 to be moved to an arbitrary position.

[ control part (control panel) ]

As shown in fig. 4, the controller 490 is connected to and controls at least the rotating mechanism 440 and the moving mechanism 450, for example.

The control unit 490 includes a computer, for example. Specifically, the computer is configured as a PLC (Programmable Logic Controller), for example, and includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a storage device, an I/O port, and an input/output Unit. The RAM, the storage device, and the I/O port are configured to be capable of exchanging data with the CPU. The I/O ports are connected to, for example, a rotation mechanism 440 and a movement mechanism 450, respectively. The input/output unit is configured to allow an operator to input a predetermined instruction, an operation condition, and the like to the computer, or to output (display) a status of the braiding apparatus 40.

The controller 490 is configured to control the rotation mechanism 440 so as to rotate the belt holder 420 and the belt feeding mechanism 430 in the circumferential direction of the power cable 100, for example.

The controller 490 is configured to be able to feedback-control the rotation mechanism 440 based on the rotation speed acquired from the motor 444 of the rotation mechanism 440, for example.

The controller 490 is configured to control the moving mechanism 450 so that the tape holder 420, the tape feeding mechanism 430, and the rotating mechanism 440 are moved in the axial direction of the power cable 100 between the pair of cable clamps 410, for example. The controller 490 is configured to perform feedback control of the moving mechanism 450 based on the number of rotations obtained from the motor of the moving mechanism 450, for example.

When controlling the moving mechanism 450, the controller 490 obtains information from the position sensor to recognize the positions of the tape holder 420, the tape conveying mechanism 430, and the rotating mechanism 440, and can perform the reverse rotation operation or the stop operation at an arbitrary position. The position sensor is, for example, an encoder, a displacement sensor, or the like.

The control unit 490 can overlap the belt 232 at an arbitrary length and wind (perform lap winding) by controlling the rotation mechanism 440 and the movement mechanism 450.

In the present embodiment, the control unit 490 controls the moving mechanism 450 to move the tape holder 420, the tape feeding mechanism 430, and the rotating mechanism 440, for example, while sequentially overlapping a part of the tape 232 wound around the outer periphery of the power cable 100 in the axial direction of the power cable 100. Further, the controller 490 controls the moving mechanism 450 so as to repeatedly move the tape holder 420, the tape feeding mechanism 430, and the rotating mechanism 440 in the axial direction of the power cable 100 between the pair of cable holders 410, for example. Further, for example, controller 490 controls movement mechanism 450 so as to gradually expand the repeated movement range from the connection point of a pair of power cables 100 toward the outside in the axial direction of power cable 100.

In the present embodiment, the control unit 490 is configured to be switchable between an automatic operation mode and a manual operation mode, for example.

In the automatic operation mode, the control unit 490 is configured to automatically control the rotation mechanism 440 and the movement mechanism 450 triggered by a start instruction based on the operation conditions input to the input/output unit by the operator, for example. As the operation conditions, for example, the overlapping length of the tape 232, the tape winding speed, the number of times of inversion, the left-right inversion position, the inversion position correction after inversion, and the like are inputted, so that the tape can be automatically wound in accordance with the shape of the insulating layer 230 of the connecting portion.

On the other hand, in the manual operation mode, the control unit 490 is configured to be manually operated by an operator, for example, and to control the rotation mechanism 440 and the movement mechanism 450 (operation, stop, speed change, left-right reverse rotation) based on an operation instruction input to the input/output unit by the operator.

[ other structures ]

In addition, the braiding apparatus 40 preferably includes at least one of an intrusion sensor (not shown) for detecting an object intruding into the pair of cable clamps 410 and a proximity sensor (not shown) for detecting an object approaching the tape holder 420, the tape conveying mechanism 430, and the rotating mechanism 440. This can avoid contact between the braiding apparatus 40 and the human body.

The braiding apparatus 40 preferably includes a cover (not shown) that covers all of the pair of cable holders 410, the tape holder 420, the tape feed mechanism 430, the rotation mechanism 440, and the movement mechanism 450, for example. This can reliably avoid contact between the braiding apparatus 40 and the human body.

(3) Method for manufacturing connection power cable (cable connection method)

Next, a method for manufacturing the connected power cable according to the present embodiment will be described with reference to fig. 1 to 9. Fig. 6 is a flowchart showing a method for manufacturing the connected power cable according to the present embodiment. Fig. 7 is a flowchart showing an insulating layer forming process. In addition, the step is omitted as "S". Fig. 8 is a schematic view showing a conductor connecting step. FIG. 9 is a schematic view showing a crosslinking step.

As shown in fig. 6, the method for manufacturing the connected power cable 10 according to the present embodiment includes, for example, a preparation step S100 and a cable connection step S200.

[ S100: preparation Process

First, a plurality of power cables 100 are prepared

Specifically, power cable 100 is peeled stepwise from the tip of conductor 110 toward the opposite side. At this time, power cable 100 is processed into a pencil shape, and a conical peeling surface whose diameter is enlarged from the tip of conductor 110 to the opposite side is formed.

As shown in fig. 2, the cable insulating layer 130 is formed with a peeling surface inclined at a predetermined taper angle θ with respect to the axis of the conductor 110, for example. The taper angle θ of the peeling surface of the cable insulation layer 130 is set to, for example, 5.2 ° to 8.6 °.

After the delamination of each of the pair of power cables 100 is completed, for example, the 1 st power cable 100a is inserted and inserted into the semiconductive pipe constituting the outer semiconductive layer 240, the pressing pipe group used in the 2 nd crosslinking step S244, the metal pipe 250, and the pipe constituting the corrosion prevention layer 260.

Next, power cable 100 is shaped into a straight line (so-called "straightening"). Specifically, the heater is wound so as to cover the exposed portions of the conductor 110, the cable inner semiconductive layer 120, the cable insulating layer 130, and the cable outer semiconductive layer 140, and is heated at a predetermined temperature for a predetermined time. After the heating is completed, the heater and the like are removed. Next, the exposed portions of the conductor 110, the cable inner semiconductive layer 120, the cable insulation layer 130, and the cable outer semiconductive layer 140 are fixed along a fixing jig. In this state, exposed portions of the conductor 110, the cable inner semiconductive layer 120, the cable insulation layer 130, and the cable outer semiconductive layer 140 are cooled. Thereby, power cable 100 is shaped linearly.

[ S200: cable connection Process

After the preparation step S100 is completed, the cable connection step S200 is performed. The cable connection step S200 includes, for example, a conductor connection step S210, an inner semiconductive layer formation step S220, a 1 st crosslinking step S224, an insulating layer formation step S230, an outer semiconductive layer formation step S240, a 2 nd crosslinking step S244, an inspection step S250, a metal tube formation step S260, an anti-corrosion layer formation step S270, and a post-treatment step S280.

(S210: conductor connection step)

Conductor connection portion 210 is formed to connect conductors 110 of a pair of power cables 100.

Specifically, as shown in fig. 8, a ring 320 is fitted around the outer periphery of the outermost conductor wire layer 114f constituting the conductor 110. The ring 320 is also used for cooling during welding. After the rings 320 are fitted, the conductor wire 112 constituting the conductor wire layer 114f is bent along the outer shape of the rings 320.

The same procedure as that for the conductor wire layer 114f described above is sequentially repeated for the conductor wire layers 114e to 114 c. Then, only the

conductor wire layers

114a and 114b in the center are left in a straight line shape. The tips of the

conductor wire layers

114a and 114b remaining in a straight line shape are cut into a tapered shape (conical shape).

After the bending or the like of the conductor wire layer 114 is completed, the air nozzle 310 is disposed toward the exposed portion of the conductor 110. Conductors 110 of a pair of power cables 100 are butted in a straight line with a predetermined interval therebetween.

Next, the conductor wire layers 114 are individually soldered in the following order. Examples of the welding method of the conductor 110 include gas welding using propane gas, oxygen gas, or the like.

First, in the pair of power cables 100, the linear

conductor wire layers

114a and 114b are soldered. During and after the welding, cooling air is supplied from the air nozzle 310 to the conductor 110 to cool the welded portions of the

conductor wire layers

114a and 114 b. The cooling method may be a method in which a cooling water flow path is formed inside the ring 320 and cooling water is passed through the cooling water flow path. After cooling, the welded portions of the

conductor wire layers

114a and 114b are shaped by a belt sander and sandpaper.

Next, the conductor wires 112 of the bent conductor wire layer 114c are returned to a straight shape, and the ring 320 used when the conductor wire layer 114c is bent is removed. At this time, the conductor wire layer 114c is shaped using a jig or the like. After the shaping, the conductor wires 112 of the conductor wire layers 114c are welded to the pair of power cables 100. After the welding, the welded portion of the conductor wire 112 of the conductor wire layer 114c is cooled. After cooling, when the finished outside diameter does not meet the specifications, the conductor wire layers 114c to 114a are shaped by using a jig as appropriate.

The same procedure as described above for the welding of the conductor wire layer 114c is sequentially repeated for each of the conductor wire layers 114d to 114 f. The conductor connection portion 210 is formed in the above-described manner.

Then, the conductor connecting portion 210 is subjected to compression shaping using a predetermined conductor compression device or a compression tool. The outer diameter of the conductor connecting portion 210 is made substantially equal to the outer diameter of the conductor 110 of the power cable 100 by compression molding, and the bending of the conductor connecting portion 210 is corrected.

As a result, all the conductor wires 112 welded to the conductor connection portion 210 are integrated.

(S220: process for Forming internal semiconductive layer)

After the conductor connecting step S210, the inner semiconductive layer 220 having semiconductivity is formed so as to cover the outer circumference of the conductor connecting portion 210.

Specifically, the pair of power cables 100 are pulled in opposite directions to maintain the straight lines. In this state, the semiconductive tape is wound so as to cover the outer periphery of the conductor connection portion 210. Thereby, the inner semiconductive layer 220 is formed.

(S224: the 1 st crosslinking step)

After the inner semiconductive layer forming step S220, in the present embodiment, the inner semiconductive layer 220 is crosslinked.

Specifically, the pressing tape set is wound so as to cover the exposed portions of the inner semiconductive layer 220, the cable inner semiconductive layer 120, the cable insulation layer 130, and the cable outer semiconductive layer 140. A thermocouple, an aluminum foil, and a heater were attached, and the heating area was heated at a predetermined temperature for a predetermined time. Thereby, the inner semiconductive layer 220 is crosslinked. And after the crosslinking is finished, the heater and the pressing belt set are sequentially detached. After completion of crosslinking, the surfaces of the inner semiconductive layer 220, the cable inner semiconductive layer 120, the cable insulation layer 130, and the cable outer semiconductive layer 140 are cut and finished to a predetermined outer diameter.

(S230: insulating layer Forming Process)

After the 1 st crosslinking step S224, an insulating layer 230 having insulating properties is formed so as to cover the outer periphery of the inner semiconductive layer 220. In the present embodiment, the insulating tape 232 is wound so as to cover the exposed portions of the inner semiconductive layer 220 and the cable insulation layer 130 using the above-described braiding apparatus 40. Thereby, the insulating layer 230 is formed.

In the present embodiment, the insulating layer forming step S230 includes, for example, a braiding device preparing step S231, an automatic braiding step S232, a manual braiding step S233, a manual winding step S234, and a device disassembling step S235.

(S231: preparation of braiding apparatus)

First, sweeping in the cleaning zone is performed. The braiding apparatus 40 described above is disposed in the clean area to be cleaned.

Next, in the taping device 40, the upper sides of the pair of cable clamps 410 are opened, and the upper side of the rotary cylinder 442 of the rotating mechanism 440 is opened. The support base 462 is lowered by the elevating mechanism 464. Braiding apparatus 40 in this state is moved vertically downward in the vicinity of the connection point of the pair of power cables 100. After the braiding apparatus 40 is moved to a predetermined position, the support base 462 is raised by the lifting mechanism 464.

After the support base 462 is raised, the pair of power cables 100 are respectively gripped by the pair of cable grippers 410. In a state where power cable 100 is inserted into the hollow portion of rotary cylinder 442 inserted through rotary mechanism 440, the upper side of rotary cylinder 442 is closed, and the upper side and the lower side of rotary cylinder 442 are coupled.

After the power cable 100 is set in the braiding apparatus 40 as described above, the tape roll 234 is set in the tape holder 420. Next, tape 232 is fed from tape roll 234 through tape feed mechanism 430 to power cable 100, and the starting point of tape 232 is bonded to the outer periphery of the connection point of the pair of power cables 100.

(S232: automatic braiding Process)

After the preparation is completed, the operator switches to the automatic operation mode in the control unit 490, and inputs the operation conditions and the start instruction to the input/output unit. The winding of the belt 232 by the rotating mechanism 440 and the moving mechanism 450 is performed based on predetermined operating conditions, with a start instruction input to the input/output portion by the operator as a trigger.

Specifically, tape holder 420 and tape feeding mechanism 430 are rotated in the circumferential direction of power cable 100, and tape 232 is wound around the outer periphery of power cable 100.

Further, tape holder 420, tape feed mechanism 430, and rotation mechanism 440 are repeatedly moved in the axial direction of power cable 100 between the pair of cable holders 410. At this time, the repetitive movement range gradually expands from the connection point of the pair of power cables 100 toward the outside in the axial direction of the power cables 100.

After the winding of the belt 232 in the automatic operation mode is completed based on the predetermined operation conditions, the moving mechanism 450 is automatically stopped. Alternatively, when the belt winding state is poor due to the automatic operation, the belt is forcibly stopped at an arbitrary timing.

(S233: manual taping Process)

After the automatic braiding process S232 is completed, the operator switches to the manual operation mode in the control unit 490. The winding of the belt 232 by the rotating mechanism 440 and the moving mechanism 450 is performed via the control unit 490 based on an operation instruction input to the input/output unit by the operator.

At this time, the operator instructs, as an operation instruction, for example, a rotation direction and a rotation speed for rotating the tape holder 420 and the tape feed mechanism 430 in the circumferential direction of the power cable 100, a timing for reversing the tape holder 420, the tape feed mechanism 430, and the rotation mechanism 440 between the pair of cable clamps 410 in the axial direction of the power cable 100, and the like.

After the winding of the tape 232 in the manual operation mode is completed, the braiding apparatus 40 is stopped by an operation instruction from an operator. Next, after the tape 232 is cut, the tape holder 420, the tape conveying mechanism 430, and the rotating mechanism 440 are retreated to the end of the braiding apparatus 40, and the next process is performed.

(S234: manual winding Process)

After the manual taping process S233 is completed, the operator winds the tape 232 with his or her hand. Thereby, the outer shape and the like of the insulating layer 230 are adjusted.

(S235: device disassembling Process)

After the manual winding step S234 is completed, the braiding apparatus 40 is disassembled.

Specifically, in the taping device 40, the upper sides of the pair of cable clamps 410 are opened, and the upper side of the rotary cylinder 442 of the rotating mechanism 440 is opened. After opening them, the support 462 is lowered by the elevating mechanism 464. Then, braiding apparatus 40 is detached from power cable 100.

(S240: outer semiconductive layer Forming Process)

After the insulating layer forming step S230, an outer semiconductive layer 240 having semiconductivity is formed so as to cover the outer circumference of the insulating layer 230.

Specifically, a semiconductive pipe into which the 1 st power cable 100a is inserted in advance is wrapped around the outer periphery of the cable insulation layer 130. After the semiconductive pipe is coated, the semiconductive pipe is heat-shrunk. Then, the excess length of the semiconductive pipe is cut off. Thereby, the outer semiconductive layer 240 is formed so as to cover the outer periphery of the insulating layer 230 and come into contact with the exposed end portion of the cable outer semiconductive layer 140.

(S244: the 2 nd crosslinking step)

After the outer semiconductive layer forming step S240, the cable core is heated to crosslink the insulating layer 230, and the inner semiconductive layer 220, the insulating layer 230, and the outer semiconductive layer 240 are fused and integrated.

First, the outer circumference of the outer semiconductive layer 240 is covered by a pressing pipe and a pressing pipe group.

Next, as shown in fig. 9, the cable core covered with the pressing tube group is set in the crosslinking device 50.

The crosslinking apparatus 50 has, for example, a heating furnace (molding pot) 510, a heater 520, and a gas supply line 530. The heating furnace 510 is configured as a cylindrical body having a hollow portion into which the cable core is inserted. The heater 520 is provided in the heating furnace 510, and heats the cable core in the hollow portion of the heating furnace 510. The gas supply line 530 has a capacity capable of sealing and pressurizing a gas such as nitrogen gas or air into the hollow portion of the heating furnace 510.

After the cable core is set in the crosslinking device 50, a gas such as nitrogen gas or air is supplied from the gas supply line 530 to the cable core in the hollow portion of the heating furnace 510 and pressurized, and the cable core is heated by the heater 520. The insulating layer 230 is crosslinked by heating the cable core for a predetermined time, at a predetermined temperature, and at a predetermined pressure.

After crosslinking, the cable core is taken out from the crosslinking device 50. Next, the pressing tube group covering the cable core is detached.

(S250: inspection step)

After the 2 nd crosslinking step S244, the presence or absence of foreign matter in the cable connection portion 20, the thickness measurement of the insulating layer 230, and the like are inspected by X-ray.

(S260: metal pipe Forming Process)

After the inspection step S250 confirms that there is no abnormality, as shown in fig. 1, a metal pipe 250 made of metal is formed so as to cover the outer periphery of the outer semiconductive layer 240 as described below.

First, a water-absorbing tape is wound so as to cover the outer circumference of the outer semiconductive layer 240. Thereby, the absorbent tape layer 242 is formed.

Next, as shown in fig. 3, a heat insulating portion 244 having heat insulation properties is formed at a position immediately below the welding portion 252 described later.

After the heat insulating part 244 is formed, the metal pipe 250, into which the 1 st power cable 100a is previously inserted, is moved so that the metal pipe 250 is coated on the outer circumference of the outer semiconductive layer 240.

After the metal pipe 250 is coated, the metal pipe 250 is reduced in diameter so as to be in contact with the outer peripheral surface of the layer of the metal pipe 250 located on the inner side using a swaging apparatus.

Next, as shown in fig. 3, an axial end portion of the metal tube 250 and an axial end portion of the cable metal tube 150 are welded by a welding portion 252. Examples of the welding method of the metal pipe 250 include gas welding using hydrogen gas, oxygen gas, or the like.

After welding, the reinforcing portion 254 is formed so as to cover the outer periphery of the welded portion 252. Specifically, an epoxy resin is applied to the outer periphery of the welded portion 252, and a glass ribbon impregnated with the epoxy resin is wound. Then, the adhesive PET tape was wound so as to cover them. The reinforcing portion 254 is formed in the above manner.

Then, as shown in fig. 1, the adhesive PE tape and the adhesive PET tape are sequentially wound so as to fill the step between the exposed portion of the cable metal pipe 150 and the cable sheath 160. Thereby, the filling portion 256 is formed.

(S270: process for Forming Corrosion-preventive layer)

After the metal pipe forming step S260, as shown in fig. 1, an anti-corrosion layer 260 made of resin is formed so as to cover the outer periphery of the metal pipe 250, as described below.

First, a PE pipe having the 1 st power cable 100a inserted therein in advance is used to cover the outer periphery of the metal pipe 250, the exposed portion of the cable metal pipe 150, and a part of the outer periphery of the cable sheath 160. The PE tube was heat shrunk after being clad. Thereby, the 1 st corrosion prevention layer 262 is formed.

After the 1 st corrosion prevention layer 262 is formed, as shown in fig. 1, the PE tape is wound so as to cover the step between the axial end of the 1 st corrosion prevention layer 262 and the cable sheath 160, and is heated and melted. Thereby, the 1 st corrosion prevention part 263 is formed.

Next, a PE pipe having the 1 st power cable 100a inserted therein in advance is used to coat the outer periphery of the 1 st corrosion prevention layer 262, the 1 st corrosion prevention part 263, and a part of the outer periphery of the cable sheath 160 with the PE pipe. The PE tube was heat shrunk after being clad. Thereby, the 2 nd corrosion prevention layer 264 is formed.

After the 2 nd corrosion prevention layer 264 is formed, as shown in fig. 1, the PE tape is wound so as to cover the step between the axial end of the 2 nd corrosion prevention layer 264 and the cable sheath 160, and is heated and melted. Thereby, the 2 nd corrosion prevention part 265 is formed.

(S280: post-treatment step)

After the corrosion prevention layer formation step S270, the following post-treatment is performed as necessary.

As shown in fig. 1, the adhesive PE tape and the adhesive PET tape are sequentially wound so as to cover the axial end portion (2 nd corrosion prevention portion 265) of the corrosion prevention layer 260. Thereby, the cover portion 270 is formed.

In the above manner, the connected power cable 10 of the present embodiment is manufactured.

(4) Effects according to the present embodiment

According to the present embodiment, 1 or more effects shown below are provided.

(a) In the present embodiment, the rotation mechanism 440 of the braiding apparatus 40 rotates the tape holder 420 and the tape feed mechanism 430 in the circumferential direction of the power cable 100, and winds the tape 232 around the outer circumference of the power cable 100. Further, the belt holder 420, the belt feeding mechanism 430, and the rotating mechanism 440 are moved in the axial direction of the power cable 100 between the pair of cable clamps 410 by the moving mechanism 450.

For example, even when the tape 232 is wound around the outer periphery of the power cable 100a plurality of times in order to form the insulating layer 230 of the cable connection portion 20, the winding of the tape 232 can be performed quickly and easily by the braiding apparatus 40 described above. This can shorten the operation time of the insulating layer forming step S230 and reduce the burden on the operator. In addition, with the braiding apparatus 40 described above, the wound state of the ribbon 232 can be aligned uniformly within the connected power cable 10 regardless of the position of the cable connection portion 20 of the connected power cable 10 or the like.

As described above, by using the braiding apparatus 40, at least 1 layer of the cable connection portion 20 can be automatically and stably formed by the ribbon 232.

(b) In the present embodiment, the tape holder 420 is configured to hold the tape roll 234 such that the axis of the tape roll 234 is oriented in a direction intersecting the axis of the power cable 100.

Here, as described above, in the cable connection portion 20, the insulating layer 230 is formed in conformity with the complicated outer shape of the layer on the inner side of the insulating layer 230, and therefore, it is preferable to shorten the width of the tape 232 for the insulating layer 230. Therefore, the diameter of the tape roll 234 tends to be large.

In the tape holder 420 for holding the tape roll 234 as described above, when the axis of the tape roll 234 is parallel to the axis of the power cable 100, the outermost diameter of rotation when the tape holder 420 is rotated in the circumferential direction of the power cable 100 becomes larger depending on the diameter of the tape roll 234. Therefore, the braiding apparatus 40 may become excessively large.

In contrast, in the present embodiment, by orienting the axis of the tape roll 234 in the direction intersecting the axis of the power cable 100 (preferably, in the orthogonal direction), the above-described maximum rotational diameter can be reduced regardless of the diameter of the tape roll 234 even if the diameter of the tape roll 234 used is increased, for example. This can prevent the braiding apparatus 40 from becoming too large. As a result, the apparatus cost can be reduced and the apparatus space can be reduced.

(c) In the present embodiment, rotation mechanism 440 is configured to rotate a plurality of tape holders 420 and a plurality of tape feeding mechanisms 430 in the circumferential direction of power cable 100, and wind a plurality of tapes 232 around the outer circumference of power cable 100. With the above-described configuration, the plurality of tapes 232 can be wound simultaneously, or at least a part of the plurality of tapes 232 can be wound so as to overlap each other (so-called lap winding). This enables the insulating layer 230 requiring winding of the tape 232 a plurality of times to be formed quickly. As a result, the operation time of the insulating layer forming step S230 can be further shortened.

(d) In the present embodiment, the tape holder 420 is configured to apply a frictional force to the tape roll 234 to suppress rotation of the tape roll 234. The frictional force for suppressing the rotation of the tape roll 234 is increased, whereby the tension of the tape 232 can be increased. On the other hand, the frictional force for suppressing the rotation of the tape roll 234 is reduced, whereby the tension of the tape 232 can be reduced. In this manner, the tension of the belt 232 can be adjusted.

< other embodiments of the present invention >

While the embodiments of the present invention have been described above specifically, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention.

In the above-described embodiment, the case where the insulating layer 230 is formed by the braiding apparatus 40 has been described, but the present invention is not limited to this case. The braiding apparatus 40 may be configured to form another layer configuring the cable connection portion 20. For example, another layer such as the inner semiconductive layer 220 may be formed by changing the tape roll 234 provided in the tape holder 420 of the taping device 40.

In the above-described embodiment, the case where the connected power cables 10 form a submarine cable was described, but the connected power cables 10 may be formed to be laid in the ground or on the ground.

In the above-described embodiment, the description has been given of 1 cable connection unit 20 included in the connected power cable 10, but the connected power cable 10 may include a plurality of cable connection units 20.

In the above-described embodiment, the case where the conductors 110 are directly welded to each other at the conductor connecting portion 210 has been described, but the conductors 110 may be connected to each other by compressing a conductor sleeve surrounding the outer periphery of the conductor 110 at the conductor connecting portion 210. However, it is preferable to weld the conductors 110 directly to each other from the viewpoint of reducing the outer diameter of the conductor connecting portion 210 and improving the connection strength.

In the above-described embodiment, the case where the filler 256 is provided between the exposed portion of the cable metal tube 150 and the cable sheath 160 has been described, but the end portion of the cable sheath 160 may be cut into a tapered shape.

In the above-described embodiment, the case where the corrosion prevention layer 260 is provided in a plurality of layers in the radial direction of the conductor 110 has been described, but the corrosion prevention layer 260 may be a single layer as long as corrosion resistance can be ensured.

In the above-described embodiment, the case where the corrosion prevention layer 260 is formed of a tube was described, but the corrosion prevention layer 260 may be formed of a tape. The corrosion prevention layer 260 may be either insulating or semiconductive.

< preferred embodiment of the present invention >

Hereinafter, preferred embodiments of the present invention will be described.

(attached note 1)

A braiding apparatus, comprising:

a pair of cable clamps which respectively hold the pair of power cables;

(attached note 2)

The braiding apparatus according to supplementary note 1, wherein,

(attached note 3)

The braiding apparatus according to supplementary note 1 or supplementary note 2, wherein,

the tape conveying mechanism includes a plurality of conveying rollers for changing a conveying direction of the tape from the tape roll.

(attached note 4)

The braiding apparatus according to supplementary note 3, wherein,

the plurality of transport rollers includes:

a 1 st transport roller having a 1 st rotational axis along the axis of the tape roll; and

a 2 nd conveying roller having a 2 nd rotation axis along an axis of the power cable,

the tape is twisted between the 1 st transport roller and the 2 nd transport roller to change a width direction of the tape from a direction along an axis of the tape reel to a direction along an axis of the power cable.

(attached note 5)

The braiding apparatus according to any 1 of supplementary notes 1 to 4, wherein,

further comprising a control unit for controlling the rotating mechanism and the moving mechanism,

the control unit controls the moving mechanism so as to move the tape holder, the tape transport mechanism, and the rotation mechanism while sequentially overlapping a part of the tape wound around the outer periphery of the power cable in the axial direction of the power cable.

(incidentally 6)

The braiding apparatus according to any 1 of supplementary notes 1 to 5, wherein,

further comprises a control unit for controlling the rotating mechanism and the moving mechanism,

the control unit controls the moving mechanism so that the tape holder, the tape conveying mechanism, and the rotating mechanism are repeatedly moved between the pair of cable clamps.

(attached note 7)

The braiding apparatus according to item 6, wherein,

the control unit controls the moving mechanism so that a repeating moving range is gradually expanded outward from a connection point of the pair of power cables.

(attached note 8)

The braiding device according to any 1 of supplementary notes 1 to 7, wherein,

the belt holding rack is provided in a plurality of numbers,

(incidentally 9)

The braiding device according to any 1 of supplementary notes 1 to 8, wherein,

(attached note 10)

A method for manufacturing a connection power cable, comprising the steps of:

preparing a plurality of power cables; and

in the step of forming the insulating layer, the insulating layer is formed,

as the braiding apparatus, the following apparatus is used, which includes:

a pair of cable clamps that grip the pair of power cables, respectively;

and a moving mechanism which moves the tape holder, the tape feed mechanism, and the rotating mechanism in the axial direction of the power cable between the pair of cable holders.

Description of the reference numerals

10. Connecting power cable

20. Cable connection part

40. Braiding device

50. Cross-linking device

100. Power cable

100a 1 st power cable

100b 2 nd power cable

110. Conductor for electric device

112. Conductor wire

114 (114 a to 114 f) conductor wire layer

120. Inner semi-conducting layer of cable

130. Cable insulation layer

140. Outer semi-conducting layer of cable

150. Cable metal tube

160. Cable sheath

210. Conductor connecting part

212. Weld part

220. Inner semi-conducting layer

230. Insulating layer

232. Belt

234. Coiled strip

240. Outer semi-conducting layer

242. Water-absorbing belt layer

244. Heat insulation part

250. Metal tube

252. Weld part

254. Reinforcing part

256. Filling part

260. Anti-corrosion layer

260a bulge

262. 1 st anticorrosive layer

263. 1 st corrosion prevention part

264. No. 2 Corrosion-preventive layer

265. No. 2 anticorrosive part

270. Cover part

310. Air nozzle

320. Ring (C)

410. Cable clamp

420 (420 a, 420 b) tape holder

430 (430 a, 430 b) Belt conveying mechanism

432. 1 st feed roller

433. 1 st rotation axis

434. No. 2 conveying roller

435. 2 nd rotation axis

440. Rotating mechanism

442. Rotary drum

442g gear

444. Electric motor

450. Moving mechanism

452. Track

454. Block

462. Supporting table

464. Lifting mechanism

466. Trolley

490. Control unit

510. Heating furnace

520. Heating device

530. Gas supply line

Claims

1. A braiding apparatus comprising:

a pair of cable clamps which respectively hold the pair of power cables;

2. The braiding device of claim 1,

3. The braiding device according to claim 1 or 2,

the belt holding rack is provided in a plurality of numbers,

the rotating mechanism is configured to rotate the plurality of tape holders and the plurality of tape feeding mechanisms in the circumferential direction of the power cable, and wind a plurality of tapes around the outer periphery of the power cable.

4. The braiding device according to claim 1 or 2,

the tape holder is configured to apply a frictional force to the tape roll, the frictional force inhibiting rotation of the tape roll.