Taping device and method for manufacturing a connecting power cable

Abstract

To form at least one layer of a cable connection portion automatically and stably by means of a tape.SOLUTION: A taping device includes a pair of cable clamps each of which grips a pair of power cables, a tape holder that holds a tape roll having a tape on the outside in the radial direction of the power cable, a tape conveyance mechanism for conveying the tape from the tape roll toward the outer circumference of the power cable, a rotary mechanism for rotating the tape holder and the tape conveyance mechanism in the circumference direction of the power cable and winding the tape around the outer circumference of the power cable, and a movement mechanism that moves the tape holder, the tape conveyance mechanism, and the rotary mechanism in the axial direction of the power cable between the pair of cable clamps.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a taping device and a method for manufacturing a connected power cable.

Background Art

[0002] When manufacturing a power cable laid over a long distance, a connected power cable having a desired length may be manufactured by connecting a plurality of power cables in a factory. In this case, the cable connection part is called a "factory joint (FJ)". (For example, see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present disclosure is to automatically and stably form at least one layer of a cable connection part with a tape.

Means for Solving the Problems

[0005] According to one aspect of the present disclosure, a pair of cable clamps that respectively grip a pair of power cables, a tape holder that holds a tape roll having a tape on the outer side in the radial direction of the power cable, a tape transport mechanism that transports the tape from the tape roll toward the outer circumference of the power cable, a rotation mechanism that rotates the tape holder and the tape transport mechanism in the circumferential direction of the power cable to wind the tape around the outer circumference of the power cable, A moving mechanism that moves the tape holder, the tape conveyance mechanism, and the rotation mechanism in the axial direction of the power cable between the pair of cable clamps; comprising a taping device is provided.

[0006] According to another aspect of the present disclosure, a step of preparing a plurality of power cables; a step of forming at least one cable connection portion in which a pair of power cables among the plurality of power cables are connected; comprising The step of forming the cable connection portion includes a step of forming an insulating layer by winding a tape around the outer circumferences of the pair of power cables using a taping device. In the step of forming the insulating layer, as the taping device, a pair of cable clamps that respectively grip the pair of power cables; a tape holder that holds a tape roll having the tape on the outer side in the radial direction of the power cable; a tape conveyance mechanism that conveys the tape from the tape roll toward the outer circumference of the power cable; a rotation mechanism that rotates the tape holder and the tape conveyance mechanism in the circumferential direction of the power cable to wind the tape around the outer circumference of the power cable; a moving mechanism that moves the tape holder, the tape conveyance mechanism, and the rotation mechanism in the axial direction of the power cable between the pair of cable clamps; using a device comprising a method for manufacturing a connected power cable is provided.

Advantages of the Invention

[0007] According to the present disclosure, at least one layer of the cable connection portion can be automatically and stably formed by a tape.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

MODE FOR CARRYING OUT THE INVENTION

[0009] [Description of Embodiments of the Present Disclosure] <Findings Obtained by the Inventors> First, the findings obtained by the inventors will be described.

[0010] (i) Findings Regarding Cable Connection Parts As described above, examples of power cables laid over a long distance include submarine cables (subaqueous cables). The power cables constituting the submarine cable can be manufactured only in a finite length based on the manufacturing capacity of the factory. Therefore, as described above, by connecting a plurality of power cables in the factory, a connected power cable having a required length is manufactured as a submarine cable. Then, the connected power cable is loaded onto a laying ship.

[0011] Such a connected power cable is subject to bending stress during operations such as winding around a turntable, transportation, extension, and installation. Therefore, for example, flexibility is required for the connected power cable. Accordingly, it is desirable that the outermost diameter at the cable connection part is substantially equal to the outermost diameter of the power cable.

[0012] In addition, the connected power cable is subject to tensile stress during operations such as extension and installation, or when there is a current flow after installation. Therefore, for example, tensile strength is required for the connected power cable. Accordingly, it is desirable that the connection strength between the power cables at the cable connection part is high.

[0013] Furthermore, when the connected power cable is installed on the seabed, for example, there is a risk that the cable connection part is flooded and conductors and the like are corroded. Therefore, for example, water immersion resistance (waterproofness) is required for the connected power cable. Accordingly, it is desirable that the sealing property at the cable connection part is high.

[0014] (ii) Findings regarding each layer constituting the cable connection part In the above-described cable connection part, the conductors are connected in a state where a pair of power cables are gradually peeled off. Therefore, it is required to form each layer constituting the cable connection part in accordance with the complex outer shape of the inner layer.

[0015] Therefore, the present inventors considered, for example, forming the insulating layer of the cable connection part with a tape. As a result, it was found that the insulating layer can be stably formed in accordance with the complex outer shape of the layer inside the insulating layer.

[0016] However, in order to form the insulating layer of the cable connection part, it was necessary to wind the tape around the outer periphery of the power cable many times. For this reason, in the method of winding the tape by the operator himself, the working time became long and the burden on the operator increased. In addition, the winding state of the tape might vary depending on the operator. Therefore, a taping device capable of automatically and stably forming at least one layer of the cable connection part with a tape has been desired.

[0017] Furthermore, based on the necessity of the above-described automatic taping device, the present inventors considered a configuration in which a tape roll is rotated in the circumferential direction of the power cable as the taping device.

[0018] However, in the configuration in which the tape roll is rotated in the circumferential direction of the power cable, the entire taping device including the rotation mechanism may become too large. For this reason, there is a possibility that the device cost increases or the device space expands.

[0019] This disclosure is based on the above findings (i) and (ii) found by the present inventors.

[0020] <Embodiments of the Present Disclosure> Next, embodiments of the present disclosure will be listed and described.

[0021] [1] The taping device according to one aspect of the present disclosure includes a pair of cable clamps that respectively grip a pair of power cables, a tape holder that holds a tape roll having a tape on the outer side in the radial direction of the power cable, a tape conveyance mechanism that conveys the tape from the tape roll toward the outer periphery of the power cable, a rotation mechanism that rotates the tape holder and the tape conveyance mechanism in the circumferential direction of the power cable and winds the tape around the outer periphery of the power cable, Between the pair of cable clamps, a moving mechanism for moving the tape holder, the tape conveyance mechanism, and the rotation mechanism in the axial direction of the power cable; is provided. According to this configuration, it is possible to automatically and stably form at least one layer of the cable connection portion with a tape.

[0022] [2] In the taping device according to [1] above, The tape holder holds the tape holder so that the axis of the tape roll faces in a direction intersecting the axis of the power cable. According to this configuration, it is possible to suppress the taping device from becoming too large.

[0023] [3] In the taping device according to [1] or [2] above, A plurality of the tape holders are provided, A plurality of the tape conveyance mechanisms are provided in the same number as the tape holders, The rotation mechanism is configured to rotate the plurality of tape holders and the plurality of tape conveyance mechanisms in the circumferential direction of the power cable to wind a plurality of tapes around the outer periphery of the power cable. According to this configuration, it is possible to quickly form a layer that requires winding of the tape a large number of times.

[0024] [4] In the taping device according to any one of [1] to [3] above, The tape holder is configured to be able to apply a frictional force that suppresses the rotation of the tape roll to the tape roll. According to this configuration, it is possible to easily adjust the tension of the tape.

[0025] [5] A method for manufacturing a connected power cable according to still another aspect of the present disclosure includes: a step of preparing a plurality of power cables; a step of forming at least one cable connection portion by connecting a pair of power cables among the plurality of power cables; is provided, The step of forming the cable connection part includes a step of forming an insulating layer by winding a tape around the outer circumferences of the pair of power cables using a taping device. In the step of forming the insulating layer, As the taping device, a pair of cable clamps that respectively grip the pair of power cables, a tape holder that holds a tape roll having the tape on the outer side in the radial direction of the power cable, a tape conveyance mechanism that conveys the tape from the tape roll toward the outer circumference of the power cable, a rotation mechanism that rotates the tape holder and the tape conveyance mechanism in the circumferential direction of the power cable to wind the tape around the outer circumference of the power cable, a movement mechanism that moves the tape holder, the tape conveyance mechanism, and the rotation mechanism in the axial direction of the power cable between the pair of cable clamps, is used. According to this configuration, at least one layer of the cable connection part can be automatically and stably formed by the tape.

[0026] [Details of Embodiments of the Present Disclosure] Next, an embodiment of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, and is shown by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0027] [An Embodiment of the Present Disclosure] (1) Connected Power Cable and Cable Connection Part The connected power cable 10 and the cable connection part (cable connection structure) 20 according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 3. FIG. 1 is a schematic cross-sectional view showing the cable connection part according to this embodiment. FIG. 2 is a schematic enlarged view of the tip portion of the power cable in FIG. 1. FIG. 3 is a schematic enlarged view of the welded portion of the metal pipe in FIG. 1.

[0028] In addition, in FIG. 1, the power cable 100 shows a side surface that has been step-peeled. Since FIGS. 1 to 3 are merely schematic diagrams, the thickness, spacing, shape, etc. of each part shown in each figure may differ from the actual shape. Also, the lower side of each of FIGS. 1 to 3 is omitted.

[0029] As shown in FIG. 1, the connected power cable 10 of this embodiment is configured as a submarine cable to be laid underwater (under the sea), and has a plurality of power cables 100 and at least one cable connection part 20.

[0030] Hereinafter, the "axial direction" of the power cable 100 etc. refers to the direction along the central axis of the power cable 100 etc., and can be rephrased as the longitudinal direction of the power cable 100 etc. Also, the "radial direction" of the power cable 100 etc. refers to the direction perpendicular to the axial direction of the power cable 100 etc., and in some cases can be rephrased as the short-side direction of the power cable 100 etc. Further, the "circumferential direction" of the power cable 100 etc. refers to the direction along the outer circumference of the power cable 100 etc.

[0031] [Power Cable] The power cable 100 is configured as a solid insulation cable (CE cable: Crosslinked polyethylene (PE) insulated PE sheathed cable, also called XLPE cable) which is a high-voltage power transmission cable.

[0032] The power cable 100 has, for example, a conductor 110, an inner cable semiconductive layer 120, a cable insulation layer 130, an outer cable semiconductive layer 140, a water absorption layer (not shown), a cable metal pipe 150, and a cable sheath 160 from the central axis side toward the outer circumference side. Note that, among the power cable 100, the part from the conductor 110 to the outer cable semiconductive layer 140 may be referred to as the "cable core".

[0033] Although not shown in FIGS. 1 and 2 for example, the conductor 110 has a plurality of conductor strand layers 114 formed by spirally twisting a plurality of conductor strands 112. The conductor strands 112 are made of, for example, copper, copper alloy, aluminum, or aluminum alloy.

[0034] The power cable 100 is stepwise peeled from the tip of the conductor 110 toward the opposite side (so-called "step peeling"). That is, the conductor 110, the inner semi-conductive layer 120 of the cable, the cable insulating layer 130, the outer semi-conductive layer 140 of the cable, the cable metal tube 150, and the cable sheath 160 are exposed in this order from the tip side of the conductor 110 toward the opposite side. Hereinafter, each of the step-peeled portions may be referred to as an "exposed portion". With such a configuration, the power cables 100 can be connected in order from the central axis side toward the outer peripheral side.

[0035] The conductor 110, the inner semi-conductive layer 120 of the cable, the cable insulating layer 130, the outer semi-conductive layer 140 of the cable, and the cable metal tube 150 are cut obliquely with respect to the axis of the conductor 110. In other words, the power cable 100 is processed, for example, in a pencil shape and has a conical peeling surface (not shown in the figure) that expands in diameter from the tip of the conductor 110 toward the opposite side.

[0036] Here, as shown in FIG. 2, the cable insulating layer 130 has a peeling surface that is 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 insulating layer 130 is, for example, 5.2° or more and 8.6° or less with respect to the axis of the conductor 110. By setting the taper angle θ to 5.2° or more, it is possible to suppress the length of the cable connection portion 20 in the axial direction of the conductor 110 from becoming excessively long. On the other hand, by setting the taper angle θ to 8.6° or less, it is possible to ensure workability while relaxing the electric field around the exposed cable insulating layer 130.

[0037] As shown in Fig. 1, a plurality of power cables 100 are provided. Among the plurality of power cables 100, a pair of power cables 100 are butted with the axes of their respective conductors 110 aligned. In the following, one of the pair of power cables 100 may be referred to as the "first power cable 100a", and the other one power cable 100 may be referred to as the "second power cable 100b".

[0038] [Cable connection part] As shown in Fig. 1, the cable connection part 20 has, for example, a conductor connection part 210, an internal semiconductive layer 220, an insulating layer 230, an external semiconductive layer 240, a water absorption tape layer 242, a metal tube (protective tube) 250, and an anticorrosion layer (connection part sheath) 260.

[0039] (Conductor connection part) In the conductor connection part 210, the respective conductors 110 of the pair of power cables 100 are connected. The point where the pair of conductors 110 are connected is also referred to as the "connection point". The conductor connection part 210 has, for example, exposed parts (not shown in the figure) of the pair of conductors 110 and a welded part 212.

[0040] Although the details of the conductor connection process will be described later, in the welded part 212 of the conductor connection part 210 of the present embodiment, for example, the conductors 110 are directly welded to each other without a metal cylinder (so-called conductor sleeve) provided on the outer periphery of the conductor 110. In the welded part 212, as will be described later, a plurality of conductor strands 112 are welded in each of the plurality of conductor strand layers 114 of the conductor 110. Further, the conductor connection part 210 is compressed, for example, in the radial direction of the conductor 110. With such a configuration, the outer diameter of the conductor connection part 210 is substantially equal to the outer diameter of the conductor 110 of the power cable 100.

[0041] (Internal semiconductive layer) As shown in Figs. 1 and 2, the internal semiconductive layer 220 is provided so as to cover the outer periphery of the conductor connection part 210. The internal semiconductive layer 220 has semiconductive properties. Thereby, the electric field concentration near the surface of the conductor connection part 210 can be alleviated.

[0042] In this embodiment, the internal semiconductive layer 220 is formed of, for example, a semiconductive tape wound around the outer periphery of the conductor connection portion 210. The semiconductive tape is, for example, a cloth tape such as nylon or Tetoron (registered trademark) coated with semiconductive rubber, or a tape formed of a semiconductive resin material similar to the cable internal semiconductive layer 120 of the power cable 100 and having a crosslinking agent, and is crosslinked by a crosslinking process described later. By forming the internal semiconductive layer 220 with such a semiconductive tape, the internal semiconductive layer 220 can be formed according to the outer shape and length of the conductor connection portion 210.

[0043] (Insulating layer) As shown in FIG. 1, the insulating layer 230 is provided so as to cover the outer periphery of the internal semiconductive layer 220. The insulating layer 230 has insulation properties. Thereby, the insulation outside the conductor connection portion 210 is ensured.

[0044] In this embodiment, the insulating layer 230 covers, for example, the internal semiconductive layer 220 and the exposed portion of the cable insulating layer 130. The insulating layer 230 has, for example, a conical surface whose diameter expands from the end of the insulating layer 230 in the axial direction of the conductor 110 toward the center.

[0045] In this embodiment, the insulating layer 230 is formed of, for example, an insulating tape wound around the outer periphery of the exposed portions of the internal semiconductive layer 220 and the cable insulating layer 130. The insulating tape is, for example, a tape formed of an insulating resin material similar to the cable insulating layer 130 of the power cable 100 and having a crosslinking agent, and is crosslinked by a crosslinking process described later. By forming the insulating layer 230 with such an insulating tape, the insulating layer 230 can be formed according to the complex outer shape of the exposed portions of the internal semiconductive layer 220 and the cable insulating layer 130.

[0046] The insulating layer 230 is formed of an insulating tape 232 using a taping device 40 described later. Details of this will be described later.

[0047] (Outer semiconductive layer) As shown in FIG. 1, the outer semiconductive layer 240 is provided so as to cover the outer periphery of the insulating layer 230. The outer semiconductive layer 240 has semiconductive properties. Thereby, the electric field concentration near the outside of the insulating layer 230 can be alleviated.

[0048] In the present embodiment, the outer semiconductive layer 240 is constituted by, for example, a semiconductive tube that covers the outer periphery of the cable insulating layer 130. Examples of the material of the semiconductive tube include resin materials containing carbon black and the like. Further, the semiconductive tube has heat shrinkability. Further, the semiconductive tube is crosslinked by a method such as electron beam irradiation during the manufacture of the semiconductive tube, and is welded and integrated with the insulating layer by a crosslinking process described later. By configuring the outer semiconductive layer 240 with such a semiconductive tube, even if the layer inside the outer semiconductive layer 240 is constituted by a tape, the surface of the outer semiconductive layer 240 can be made smooth.

[0049] In the present embodiment, the outer semiconductive layer 240 covers the outer periphery of the insulating layer 230 and is in contact with the exposed end portion of the cable outer semiconductive layer 140. Thereby, the outer semiconductive layer 240 is at the same electric potential as the cable outer semiconductive layer 140 electrically.

[0050] (Water-absorbing tape layer) As shown in FIG. 1, the water-absorbing tape layer 242 is provided so as to cover the outer periphery of the outer semiconductive layer 240, that is, preferably provided between the outer semiconductive layer 240 and a metal tube 250 described later. The water-absorbing tape layer 242 is configured in the same manner as the water-absorbing layer of the power cable 100, and is, for example, a tape in which semiconductive rubber is coated on a polyester base fabric and a water-absorbing polymer is attached. By providing such a water-absorbing tape layer 242, even if water intrudes into the metal tube 250, the propagation of water (that is, water running) can be suppressed.

[0051] (Metal tube) As shown in FIG. 1, the metal tube 250 is provided to cover the outer periphery of the external semiconductive layer 240 (water-absorbing tape layer 242). The metal tube 250 is made of a rigid metal. Examples of the metal constituting the metal tube 250 include lead and aluminum. By providing such a metal tube 250, the impact resistance of the cable connection portion 20 can be improved.

[0052] In the present embodiment, the metal tube 250 is reduced in diameter so as to be in contact with the outer peripheral surface of the layer located inside the metal tube 250 (that is, the water-absorbing tape layer 242 here). Therefore, the metal tube 250 has, for example, traces of diameter reduction. With such a configuration, the outermost diameter of the cable connection portion 20 can be reduced.

[0053] As shown in FIG. 3, the axial end of the metal tube 250 and the axial end of the cable metal tube 150 are welded by a welded portion 252. Thereby, water ingress between the metal tube 250 and the cable metal tube 150 can be suppressed, and they can be made electrically equipotential.

[0054] Also, in the present embodiment, it is preferable that a heat insulating portion 244 having heat insulating properties is provided between the welded portion 252 and the cable external semiconductive layer 140. Thereby, thermal degradation of the cable core can be suppressed during welding of the welded portion 252.

[0055] Furthermore, in the present embodiment, a reinforcing portion 254 is provided so as to cover the outer periphery of the welded portion 252. Specifically, the reinforcing portion 254 has, for example, an epoxy resin, a glass tape impregnated with the epoxy resin, and an adhesive PET (Polyethylene Terephthalate) tape covering these. Thereby, the occurrence of cracks at the end of the welded portion 252 can be suppressed.

[0056] (Anticorrosion layer) As shown in FIG. 1, the anticorrosion layer 260 is provided so as to cover the outer periphery of the metal pipe 250 and the exposed portion of the cable metal pipe 150. The anticorrosion layer 260 is made of a resin having anticorrosion properties. Examples of the resin having anticorrosion properties include a polyethylene mixture. Thereby, corrosion of the cable core can be suppressed.

[0057] In the present embodiment, the anticorrosion layer 260 is constituted by, for example, a tube that 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 outer periphery of the metal pipe 250 can be easily covered by the tube of the anticorrosion layer 260. Further, the outer peripheral surface of the anticorrosion layer 260 can be made smooth.

[0058] Since the anticorrosion layer 260 covers up to a part of the outer periphery of the cable sheath 160, it has a swelling portion 260a on the outer periphery of the cable sheath 160. The swelling portion 260a can stably suppress water from entering the cable core.

[0059] Further, in the present embodiment, the anticorrosion layer 260 may be provided in a plurality of layers in the radial direction of the conductor 110, for example. Thereby, the anticorrosion property and reliability of the anticorrosion layer 260 can be improved.

[0060] Specifically, the first anticorrosion layer 262 is provided so as 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. A first anticorrosion portion 263 is provided so as to cover the step between the axial end of the first anticorrosion layer 262 and the cable sheath 160. The first anticorrosion portion 263 is constituted by, for example, a heat-melted polyethylene (PE) tape.

[0061] Furthermore, the second anticorrosion layer 264 is provided to cover the outer periphery of the first anticorrosion layer 262, the first anticorrosion portion 263, and a part of the outer periphery of the cable sheath 160. A second anticorrosion portion 265 is provided to cover the step between the axial end of the second anticorrosion layer 264 and the cable sheath 160. The second anticorrosion portion 265 is composed of, for example, a heat-melted PE tape.

[0062] With such a configuration, it is possible to improve the anticorrosion performance and reliability of the anticorrosion layer 260.

[0063] As shown in FIG. 1, in this embodiment, it is preferable that a filling portion 256 is provided to fill the step between the exposed portion of the cable metal tube 150 and the cable sheath 160. The filling portion 256 is composed of, for example, an adhesive PE tape and an adhesive PET tape. Thereby, the anticorrosion layer 260 can be smoothly coated between the exposed portion of the cable metal tube 150 and the cable sheath 160.

[0064] (Cover portion) In this embodiment, it is preferable that a cover portion 270 is provided to cover the axial end (the second anticorrosion portion 265) of the anticorrosion layer 260. The cover portion 270 is composed of, for example, an adhesive PE tape and an adhesive PET tape. Thereby, the unevenness near the axial end of the anticorrosion layer 260 can be smoothed.

[0065] (Others) In this embodiment, it is preferable that the connecting power cable 10 has a label indicating the position of the cable connection portion 20. The label is composed of, for example, a colored tape attached to the outer peripheral surface of the power cable 100 or the cable connection portion 20. Note that the label may be configured as a pattern printed or applied on the outer peripheral surface of the power cable 100. Examples of the position of the label include both ends or the central portion of the cable connection portion 20. Thereby, the position of the cable connection portion 20 can be easily visually recognized.

[0066] (Specific dimensions, etc.) The outermost diameter of the cable connection part 20 of the present embodiment is approximately the same as the outermost diameter of the power cable 100, for example. Specifically, the outermost diameter of the anticorrosion layer 260 in a cross section perpendicular to the axis of the power cable 100 including the conductor connection part 210 is, for example, +5 mm or more and +15 mm or less with respect to the outermost diameter of the power cable 100.

[0067] In the present embodiment, even at the position where the swelling part 260a of the above-mentioned anticorrosion layer 260 is formed, the outermost diameter of the cable connection part 20 is suppressed. Specifically, the outermost diameter in a cross section perpendicular to the axis of the power cable 100 including the swelling part 260a is, for example, +5 mm or more and +20 mm or less with respect to the outermost diameter of the power cable 100.

[0068] (2) Taping device Next, with reference to FIGS. 4 and 5, the taping device 40 according to the present embodiment will be described. FIG. 4 is a schematic diagram showing the taping device according to the present embodiment. FIG. 5 is an enlarged view of a part of FIG. 4 as viewed from the axial direction of the power cable.

[0069] In the taping device 40, the "axial direction of the power cable 100" can be rephrased as the "extending direction of the power cable 100 gripped by the cable clamp 410" or the "insertion direction of the power cable 100 in the cable clamp 410".

[0070] The taping device 40 according to the present embodiment is configured to form at least one layer constituting the cable connection part 20 by winding a predetermined tape 232 around the outer periphery of the power cable 100, for example. Specifically, the taping device 40 is configured to form at least the insulating layer 230 as described above, for example.

[0071] As shown in FIGS. 4 and 5, the taping device 40 of the present embodiment includes, for example, a cable clamp 410, a tape holder 420, a tape conveyance mechanism 430, a rotation mechanism 440, a movement mechanism 450, a support base 462, a lifting mechanism 464, a carriage 466, and a control unit 490.

[0072] [Cable Clamp] As shown in FIG. 4, for example, a pair of cable clamps 410 are provided. The pair of cable clamps 410 (410a, 410b) are configured to grip a pair of power cables 100 (100a, 100b), respectively.

[0073] In the pair of power cables 100 gripped by the pair of cable clamps 410, the conductors 110 are connected to each other in the above-described step-stripped state, and a conductor connection portion 210 is formed. Further, an internal semiconductive layer 220 is provided so as to cover the outer periphery of the conductor connection portion 210.

[0074] Specifically, the cable clamp 410 has, for example, an insertion hole (not shown in the figure) through which the power cable 100 is inserted. Also, the upper side and the lower side of the cable clamp 410 are separably opened and closed in a cross section including the insertion hole of the cable clamp 410. The upper side and the lower side of the cable clamp 410 are configured to be screwed together with the power cable 100 inserted into the insertion hole. With such a configuration, the power cable 100 can be gripped by the cable clamp 410.

[0075] [Tape Holder] As shown in FIGS. 4 and 5, the tape holder 420 is configured to hold a tape roll 234 having a tape 232 outside the power cable 100, for example.

[0076] Here, the "tape 232" is, for example, an insulating tape constituting the insulating layer 230. Also, the "tape roll 234" is a roll obtained by winding the tape 232 a plurality of times.

[0077] Here, in order to form the insulating layer 230 in accordance with the complex outer shape of the layer inside the insulating layer 230, it is preferable to shorten the width of the tape 232 for the insulating layer 230. For this reason, the number of windings of the tape 232 around 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.

[0078] Therefore, in the present embodiment, the tape holder 420 is configured to hold the tape roll 234 such that, for example, the axis of the tape roll 234 faces in a direction intersecting the axis of the power cable 100. Furthermore, it is preferable that the tape holder 420 holds the tape roll 234 such that, for example, the axis of the tape roll 234 faces in a direction orthogonal to the axis of the power cable 100. Thereby, even if the diameter of the tape roll 234 is large, it is possible to suppress the taping device 40 from becoming excessive.

[0079] Also, in the present embodiment, the tape holder 420 is configured to be able to apply a frictional force that suppresses the rotation of the tape roll 234 to the tape roll 234. Specifically, the tape holder 420 has, for example, a socket screw that applies a frictional force to the inner peripheral surface of the cylindrical core of the tape roll 234. Thereby, the tension of the tape 232 can be easily adjusted.

[0080] [Tape conveyance mechanism] As shown in FIGS. 4 and 5, the tape conveyance mechanism 430 is configured to convey (feed out) the tape 232 from the tape roll 234 toward the outer periphery of the power cable 100.

[0081] Specifically, as shown in FIG. 5, the tape conveyance mechanism 430 has, for example, a plurality of conveyance rollers that change the conveyance direction of the tape 232 from the tape roll 234. The plurality of conveyance rollers includes, for example, a first conveyance roller 432 and a second conveyance roller 434.

[0082] The first transport roller 432 has, for example, a first rotation axis 433 along the axis of the tape roll 234 held by the tape holder 420. The first transport roller 432 is disposed, for example, between the tape roll 234 held by the tape holder 420 and the power cable 100. Further, the first rotation axis 433 of the first transport roller 432 is preferably disposed so as to overlap and be parallel to the axis of the tape roll 234 held by the tape holder 420 when viewed from the axial direction of the power cable 100.

[0083] The second transport roller 434 has, for example, a second rotation axis 435 along the axis of the power cable 100. The second transport roller 434 is disposed, for example, outside the power cable 100 in the radial direction and at a position where it does not interfere with the first transport roller 432. Further, the second rotation axis 435 of the second transport roller 434 is preferably disposed parallel to the axis of the power cable 100.

[0084] The tape transport mechanism 430 is configured to twist the tape 232 between the first transport roller 432 and the second transport roller 434 and convert 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.

[0085] Note that a plurality of second transport rollers 434 may be provided, for example.

[0086] [Plural arrangement] In the present embodiment, a plurality of the above-described tape holders 420 are provided. Further, a plurality of tape transport mechanisms 430 are provided in the same number as the tape holders 420.

[0087] Specifically, for example, two tape holders 420 are provided. The two tape holders 420 are referred to as "tape holders 420a and 420b". Also, for example, two tape conveyance mechanisms 430 are provided. The two tape conveyance mechanisms 430 are referred to as "tape conveyance mechanisms 430a and 430b". The tape conveyance mechanism 430a conveys the tape 232 from the tape holder 420a, and the tape conveyance mechanism 430b has the same constituent members as the tape conveyance mechanism 430a and is configured to convey the tape 232 from the tape holder 420b.

[0088] [Rotating mechanism] As shown in FIGS. 4 and 5, for example, the rotating mechanism 440 is configured to rotate the tape holder 420 and the tape conveyance mechanism 430 in the circumferential direction of the power cable 100 (e.g., the direction of the thick arrow in the figure) and wind the tape 232 around the outer circumference of the power cable 100. Note that the rotating mechanism 440 rotates the tape holder 420 and the tape conveyance mechanism 430 in the circumferential direction of the power cable 100 while maintaining their relative positional relationships.

[0089] Specifically, for example, the rotating mechanism 440 includes a rotating cylinder 442 and a motor 444.

[0090] The rotating cylinder 442 has, for example, a hollow portion (not shown by reference numeral) through which the power cable 100 is inserted. Also, the rotating cylinder 442 is configured to be rotatable in the circumferential direction of the power cable 100 while holding the tape holder 420 and the tape conveyance mechanism 430 on the outer side in the radial direction of the power cable 100. More specifically, for example, the rotating cylinder 442 holds the tape holder 420 on the outer peripheral side of the rotating cylinder 442 and holds the tape holder 420 on the first end side in the axial direction of the rotating cylinder 442. Further, the rotating cylinder 442 has, for example, a gear 442g provided over the outer circumference of the second end side in the axial direction of the rotating cylinder 442.

[0091] Note that the rotating cylinder 442 is, for example, divided in an openable and closable manner in a cross-section including a hollow portion along the axial direction of the rotating cylinder 442. Thereby, the power cable 100 can be easily inserted into the hollow portion of the rotating cylinder 442.

[0092] The motor 444 is configured to rotate the rotating cylinder 442, for example, by meshing with the gear 442g of the above-described rotating cylinder 442. The motor 444 is connected to, for example, a control unit 490 described later.

[0093] Also, in the present embodiment, the rotating mechanism 440 is configured to rotate a plurality of tape holders 420 and a plurality of tape conveyance mechanisms 430 in the circumferential direction of the power cable 100 and wind a plurality of tapes 232 around the outer periphery of the power cable 100. Note that the rotating mechanism 440 rotates the plurality of tape holders 420 and the plurality of tape conveyance mechanisms 430 in the circumferential direction of the power cable 100 while maintaining their relative positional relationships. With such a configuration, a plurality of tapes 232 can be wound simultaneously, or at least a part of the plurality of tapes 232 can be wound overlapping each other (so-called lap winding).

[0094] [Moving mechanism] As shown in FIG. 4, the moving mechanism 450 is configured to move the tape holder 420, the tape conveyance mechanism 430, and the rotating mechanism 440 in the axial direction of the power cable 100, for example, between a pair of cable clamps 410.

[0095] Specifically, the moving mechanism 450 is configured as a so-called linear guide and has, for example, a rail 452, a ball screw (not shown), a ball screw motor (not shown), and a block 454.

[0096] The rail 452 and the ball screw are provided, for example, along the axial direction of the power cable 100 gripped by a pair of cable clamps 410. For example, a ball screw is disposed between a pair of rails 452. The ball screw motor is configured to rotate the ball screw in the circumferential direction of the ball screw. The block 454 is screwed onto the ball screw and is configured to linearly move along the rail 452 as the ball screw rotates in the circumferential direction. At least the above-described rotation mechanism 440 is fixed on the block 454. With such a configuration, by moving the block 454 of the moving mechanism 450 along the rail 452, the tape conveyance mechanism 430 and the rotation mechanism 440 can be moved in the axial direction of the power cable 100.

[0097] [Configuration below the device] As shown in FIG. 4, the support base 462 is configured to support, for example, at least a pair of cable clamps 410 and the moving mechanism 450. The lifting mechanism 464 is configured to lift the support base 462 in the vertical direction. Thereby, by lifting the taping device 40 from directly below the power cable 100, the power cable 100 can be easily set in the taping device 40.

[0098] The carriage 466 is configured to be movable, for example, with the lifting mechanism 464 placed thereon. Thereby, the taping device 40 can be moved to an arbitrary position.

[0099] [Control unit (control panel)] As shown in FIG. 4, the control unit 490 is connected to, for example, at least the rotation mechanism 440 and the moving mechanism 450 and is configured to control them.

[0100] The control unit 490 has, for example, a computer. Specifically, the computer is configured as, for example, a PLC (Programmable Logic Controller) and has a CPU (Central Processing Unit), a RAM (Random Access Memory), a storage device, I / O ports, and an input / output unit. The RAM, the storage device, and the I / O ports are configured to be able to exchange data with the CPU. The I / O ports are connected to, for example, the rotation mechanism 440 and the movement mechanism 450 respectively. The input / output unit is configured such that an operator can input predetermined instructions, operating conditions, etc. to the computer, or output (display) the status of the taping device 40.

[0101] The control unit 490 is configured to be able to control the rotation mechanism 440 so as to rotate the tape holder 420 and the tape conveyance mechanism 430 in the circumferential direction of the power cable 100, for example. Further, the control unit 490 is configured to be able to perform feedback control of the rotation mechanism 440 based on, for example, the rotation speed obtained from the motor 444 of the rotation mechanism 440.

[0102] The control unit 490 is configured to be able to control the movement mechanism 450 so as to move the tape holder 420, the tape conveyance mechanism 430, and the rotation mechanism 440 in the axial direction of the power cable 100 between the pair of cable clamps 410, for example. Further, the control unit 490 is configured to be able to perform feedback control of the movement mechanism 450 based on, for example, the rotation speed obtained from the motor of the movement mechanism 450.

[0103] When controlling the movement mechanism 450, the control unit 490 obtains information from the position sensor to grasp the positions of the tape holder 420, the tape conveyance mechanism 430, and the rotation mechanism 440, and can perform a reverse operation or a stop operation at an arbitrary position. The position sensor is, for example, an encoder, a displacement sensor, or the like.

[0104] The control unit 490 can wind the tape 232 by overlapping it to an arbitrary length (wrap winding) by controlling the rotation mechanism 440 and the movement mechanism 450.

[0105] In the present embodiment, the control unit 490 controls the movement mechanism 450 so as to move the tape holder 420, the tape conveyance mechanism 430, and the rotation mechanism 440 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 control unit 490 controls the movement mechanism 450 so as to repeatedly move the tape holder 420, the tape conveyance mechanism 430, and the rotation mechanism 440 in the axial direction of the power cable 100 between the pair of cable clamps 410, for example. Further, the control unit 490 controls the movement mechanism 450 so as to gradually expand the repeated movement range outward in the axial direction of the power cable 100 from the connection point of the pair of power cables 100, for example.

[0106] Furthermore, in the present embodiment, the control unit 490 is configured to be switchable between, for example, an automatic operation mode and a manual operation mode.

[0107] In the automatic operation mode, the control unit 490 is configured to automatically control the rotation mechanism 440 and the movement mechanism 450, for example, with a start instruction as a trigger based on the operation conditions input by the operator to the input / output unit. As the operation conditions, for example, by inputting the overlapping length of the tape 232, the tape winding speed, the number of reversals, the left / right reversal position, the reversal position correction after reversal, etc., automatic winding can be performed according to the shape of the insulating layer 230 of the connection portion.

[0108] On the other hand, in the manual operation mode, the control unit 490 is configured to be manually operable by the operator, that is, to control (operate, stop, change speed, reverse left / right) the rotation mechanism 440 and the movement mechanism 450 based on the operation instruction input by the operator to the input / output unit.

[0109] [Other configurations] In addition, the taping device 40 preferably has, for example, an intrusion sensor (not shown) that detects an object entering into a pair of cable clamps 410, and at least one of proximity sensors (not shown) that detect an object approaching the tape holder 420, the tape conveyance mechanism 430, and the rotation mechanism 440. Thereby, contact between the taping device 40 and a human body can be avoided.

[0110] Furthermore, the taping device 40 preferably has a cover (not shown) that covers all of, for example, a pair of cable clamps 410, the tape holder 420, the tape conveyance mechanism 430, the rotation mechanism 440, and the movement mechanism 450. Thereby, contact between the taping device 40 and a human body can be surely avoided.

[0111] (3) Method for manufacturing a connected power cable (cable connection method) Next, with reference to FIGS. 1 to 9, a method for manufacturing a connected power cable according to the present embodiment will be described. FIG. 6 is a flowchart showing the method for manufacturing a connected power cable according to the present embodiment. FIG. 7 is a flowchart showing an insulating layer forming step. Note that the steps are abbreviated as "S". FIG. 8 is a schematic diagram showing a conductor connection step. FIG. 9 is a schematic diagram showing a crosslinking step.

[0112] As shown in FIG. 6, the method for manufacturing the connected power cable 10 of the present embodiment has, for example, a preparation step S100 and a cable connection step S200.

[0113] [S100: Preparation step] First, a plurality of power cables 100 are prepared.

[0114] Specifically, the power cable 100 is gradually peeled from the tip of the conductor 110 toward the opposite side. At this time, the power cable 100 is processed into a pencil shape to form a conical peeling surface whose diameter expands from the tip of the conductor 110 toward the opposite side.

[0115] Also, as shown in FIG. 2, in the cable insulation layer 130, for example, a peeling surface inclined at a predetermined taper angle θ with respect to the axis of the conductor 110 is formed. The taper angle θ of the peeling surface of the cable insulation layer 130 is, for example, 5.2° or more and 8.6° or less.

[0116] After the step-by-step peeling of each of the pair of power cables 100 is completed, for example, the first power cable 100a is inserted into the inside of the semiconductive tube constituting the external semiconductive layer 240, the presser tube group used in the second crosslinking step S244, the metal tube 250, and the tube constituting the anticorrosion layer 260.

[0117] Next, the power cable 100 is shaped into a straight line (so-called "straightening" is performed). Specifically, a heater is wound around the exposed portions of the conductor 110, the internal semiconductive layer 120 of the cable, the cable insulation layer 130, and the external semiconductive layer 140 of the cable, and heated to a predetermined temperature for a predetermined time. After the heating is completed, the heater and the like are removed. Next, along the fixing jig, the exposed portions of the conductor 110, the internal semiconductive layer 120 of the cable, the cable insulation layer 130, and the external semiconductive layer 140 of the cable are fixed. In that state, the exposed portions of the conductor 110, the internal semiconductive layer 120 of the cable, the cable insulation layer 130, and the external semiconductive layer 140 of the cable are cooled. Thereby, the power cable 100 is shaped into a straight line.

[0118] [S200: Cable connection step] When 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 internal semiconductive layer formation step S220, a first crosslinking step S224, an insulation layer formation step S230, an external semiconductive layer formation step S240, a second crosslinking step S244, an inspection step S250, a metal tube formation step S260, an anticorrosion layer formation step S270, and a post-treatment step S280.

[0119] (S210: Conductor connection step) A conductor connection portion 210 is formed by connecting the conductors 110 of each of the pair of power cables 100.

[0120] Specifically, as shown in FIG. 8, a ring 320 is fitted around the outer periphery of the outermost conductor strand layer 114f that constitutes the conductor 110. The ring 320 is also used for cooling during welding. After fitting the ring 320, the conductor strands 112 that constitute the conductor strand layer 114f are bent along the outer shape of the ring 320.

[0121] The same procedure as that for the conductor strand layer 114f described above is sequentially repeated for each of the conductor strand layers 114e to 114c. After that, only the central conductor strand layers 114a and 114b are left straight. The tips of the straight conductor strand layers 114a and 114b are cut into a conical (tapered) shape.

[0122] After the bending of the conductor strand layer 114 is completed, the air nozzle 310 is arranged facing the exposed portion of the conductor 110. The conductors 110 of each of the pair of power cables 100 are butted against each other in a straight line with a predetermined interval therebetween.

[0123] Next, each of the conductor strand layers 114 is welded by the following procedure. Examples of the welding method for the conductor 110 include gas welding using propane gas and oxygen gas.

[0124] First, in the pair of power cables 100, the straight conductor strand layers 114a and 114b are welded. During and after welding, cooling air is supplied from the air nozzle 310 to the conductor 110 to cool the welded portions of the conductor strand layers 114a and 114b. The cooling method may be a method of forming a flow path for cooling water inside the ring 320 and passing the cooling water through it. After cooling, the welded portions of the conductor strand layers 114a and 114b are shaped using a belt sander and sandpaper.

[0125] Next, straighten the conductor strands 112 of the bent conductor strand layer 114c, and remove the ring 320 used for bending the conductor strand layer 114c. At this time, use a jig or the like to shape the conductor strand layer 114c. After shaping, in the pair of power cables 100, weld the respective conductor strands 112 of the conductor strand layer 114c. After welding, cool the welded portion of the conductor strands 112 of the conductor strand layer 114c. After cooling, if the finished outer diameter does not meet the specifications, appropriately use a jig to shape the conductor strand layers 114c to 114a.

[0126] Repeat the same procedure as the above-described procedure for welding the conductor strand layer 114c in sequence for each of the conductor strand layers 114d to 114f. In this way, the conductor connection portion 210 is formed.

[0127] Thereafter, use a predetermined conductor compression device or compression tool to compress and shape the conductor connection portion 210. By compression molding, make the outer diameter of the conductor connection portion 210 substantially equal to the outer diameter of the conductor 110 of the power cable 100, and correct the bend of the conductor connection portion 210.

[0128] As a result, all the conductor strands 112 welded at the conductor connection portion 210 are integrated.

[0129] (S220: Inner Semiconductor Layer Formation Step) After the conductor connection step S210, form an inner semiconductor layer 220 having semiconductivity so as to cover the outer periphery of the conductor connection portion 210.

[0130] Specifically, pull the pair of power cables 100 in opposite directions and maintain them in a straight line. In this state, wind a semiconductive tape so as to cover the outer periphery of the conductor connection portion 210. Thereby, the inner semiconductor layer 220 is formed.

[0131] (S224: First Crosslinking Step) After the inner semiconductor layer formation step S220, in this embodiment, the inner semiconductor layer 220 is crosslinked.

[0132] Specifically, a pressing tape group is wound so as to cover the exposed portions of the internal semiconductor layer 220, the cable internal semiconductor layer 120, the cable insulating layer 130, and the cable external semiconductor layer 140. Further, a thermocouple, an aluminum foil, and a heater are attached, and the heating region is heated to a predetermined temperature for a predetermined time. Thereby, the internal semiconductor layer 220 is crosslinked. After the crosslinking is completed, the heater and the pressing tape group are sequentially removed. After the crosslinking is completed, the surfaces of the internal semiconductor layer 220, the cable internal semiconductor layer 120, the cable insulating layer 130, and the cable external semiconductor layer 140 are shaved to finish to a specified outer diameter dimension.

[0133] (S230: Insulating layer forming step) After the first crosslinking step S224, an insulating layer 230 having insulation is formed so as to cover the outer periphery of the internal semiconductor layer 220. In the present embodiment, using the above-described taping device 40, an insulating tape 232 is wound so as to cover the exposed portions of the internal semiconductor layer 220 and the cable insulating layer 130. Thereby, the insulating layer 230 is formed.

[0134] In the present embodiment, the insulating layer forming step S230 includes, for example, a taping device preparation step S231, an automatic taping step S232, a manual taping step S233, a hand winding step S234, and a device disassembly step S235.

[0135] (S231: Taping device preparation step) First, the inside of the clean booth is cleaned. The above-described taping device 40 is disposed in the cleaned clean booth.

[0136] Next, in the taping device 40, the upper sides of the pair of cable clamps 410 are opened, and the upper side of the rotating cylinder 442 of the rotation mechanism 440 is opened. Further, the support base 462 is lowered by the elevating mechanism 464. The taping device 40 in this state is moved to the vertically lower side near the connection point of the pair of power cables 100. After the taping device 40 is moved to a predetermined position, the support base 462 is raised by the elevating mechanism 464.

[0137] When the support table 462 is raised, a pair of cable clamps 410 grip a pair of power cables 100 respectively. Also, with the power cable 100 inserted into the hollow portion of the rotating cylinder 442 of the rotation mechanism 440, the upper side of the rotating cylinder 442 is closed, and the upper and lower sides of the rotating cylinder 442 are connected.

[0138] After setting the power cable 100 in the taping device 40 as described above, a tape roll 234 is set on the tape holder 420. Next, the tape 232 is sent out from the tape roll 234 through the tape conveyance mechanism 430 to the power cable 100, and the starting point of the tape 232 is adhered to the outer periphery of the connection point of the pair of power cables 100.

[0139] (S232: Automatic Taping Process) After the above preparations are completed, the operator switches to the automatic operation mode in the control unit 490 and inputs the operation conditions and start instruction to the input / output unit. Using the start instruction input by the operator to the input / output unit as a trigger, based on the predetermined operation conditions, the tape 232 is wound by the rotation mechanism 440 and the movement mechanism 450.

[0140] Specifically, the tape holder 420 and the tape conveyance mechanism 430 are rotated in the circumferential direction of the power cable 100, and the tape 232 is wound around the outer periphery of the power cable 100.

[0141] Also, between the pair of cable clamps 410, the tape holder 420, the tape conveyance mechanism 430, and the rotation mechanism 440 are repeatedly moved in the axial direction of the power cable 100. At this time, the repeated movement range is gradually widened from the connection point of the pair of power cables 100 toward the outer side in the axial direction of the power cable 100.

[0142] Based on the predetermined operation conditions, when the winding of the tape 232 in the automatic operation mode is completed, the movement mechanism 450 is automatically stopped. Alternatively, when the tape winding state by automatic operation is poor, it is forcibly stopped at an arbitrary timing.

[0143] (S233: Manual Taping Process) When the automatic taping process S232 is completed, the operator switches to the manual operation mode in the control unit 490. Based on the operation instructions input by the operator to the input / output unit, the tape 232 is wound by the rotation mechanism 440 and the moving mechanism 450 via the control unit 490.

[0144] At this time, as operation instructions, the operator instructs, for example, the rotation direction and rotation speed for rotating the tape holder 420 and the tape conveyance mechanism 430 in the circumferential direction of the power cable 100, and the timing for reversing the tape holder 420, the tape conveyance mechanism 430, and the rotation mechanism 440 in the axial direction of the power cable 100 between the pair of cable clamps 410.

[0145] When the winding of the tape 232 in the manual operation mode is completed, the taping device 40 is stopped according to the operation instructions by the operator. Next, after cutting the tape 232, the tape holder 420, the tape conveyance mechanism 430, and the rotation mechanism 440 are retracted to the end of the taping device 40, and the next process is advanced.

[0146] (S234: Manual winding process) When the manual taping process S233 is completed, the operator winds the tape 232 by hand. Thereby, the outer shape of the insulating layer 230 is adjusted.

[0147] (S235: Device disassembly process) When the manual winding process S234 is completed, the taping device 40 is disassembled.

[0148] Specifically, in the taping device 40, the upper sides of each of the pair of cable clamps 410 are opened, and the upper side of the rotating cylinder 442 of the rotation mechanism 440 is opened. After opening these, the support base 462 is lowered by the lifting mechanism 464. Thereafter, the taping device 40 is removed from the power cable 100.

[0149] (S240: External semiconductive layer forming process) After the insulating layer forming step S230, an external semiconductive layer 240 having semiconductive properties is formed so as to cover the outer periphery of the insulating layer 230.

[0150] Specifically, a semiconductive tube that has been passed through the first power cable 100a in advance is put over the outer periphery of the cable insulating layer 130. After covering with the semiconductive tube, the semiconductive tube is heat-shrunk. Then, the excess length of the semiconductive tube is cut. Thereby, while covering the outer periphery of the insulating layer 230, the external semiconductive layer 240 is formed so as to contact the exposed end portion of the cable external semiconductive layer 140.

[0151] (S244: Second crosslinking step) After the external semiconductive layer forming step S240, the cable core is heated to crosslink the insulating layer 230 and to fuse and integrate the internal semiconductive layer 220, the insulating layer 230, and the external semiconductive layer 240.

[0152] First, the outer periphery of the external semiconductive layer 240 is covered with a presser tube and a group of presser tubes.

[0153] Next, as shown in FIG. 9, the cable core covered with the group of presser tubes is set inside a crosslinking device 50.

[0154] The crosslinking device 50 has, for example, a heating furnace (mold kettle) 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 is configured to heat the cable core inside the hollow portion of the heating furnace 510. The gas supply line 530 has the ability to enclose and pressurize a gas such as nitrogen gas or air inside the hollow portion of the heating furnace 510.

[0155] After setting the cable core inside the crosslinking device 50, while supplying and pressurizing a gas such as nitrogen gas or air from the gas supply line 530 to the cable core inside the hollow portion of the heating furnace 510, the cable core is heated by the heater 520. By heating the cable core at a predetermined time, a predetermined temperature, and a predetermined pressure, the insulating layer 230 is crosslinked.

[0156] After cross-linking, the cable core is taken out from the cross-linking device 50. Next, the pressing tube group covering the cable core is removed.

[0157] (S250: Inspection process) After the second cross-linking process S244, inspections such as checking for foreign matter inside the cable connection part 20 and measuring the thickness of the insulating layer 230 are performed using X-rays.

[0158] (S260: Metal tube forming process) If it is confirmed that there is no abnormality in the inspection process S250, as shown in FIG. 1, a metal tube 250 made of metal is formed so as to cover the outer periphery of the external semiconductive layer 240 as follows.

[0159] First, a water-absorbing tape is wound so as to cover the outer periphery of the external semiconductive layer 240. Thereby, a water-absorbing tape layer 242 is formed.

[0160] Next, as shown in FIG. 3, a heat insulating part 244 having heat insulating properties is formed at a position directly below a welding part 252 to be described later.

[0161] After forming the heat insulating part 244, the metal tube 250 passed through the first power cable 100a in advance is moved, and the metal tube 250 is put on the outer periphery of the external semiconductive layer 240.

[0162] After covering the metal tube 250, the metal tube 250 is reduced in diameter using a swaging device so as to contact the outer peripheral surface of the layer located inside the metal tube 250.

[0163] Next, as shown in FIG. 3, the axial end of the metal tube 250 and the axial end of the cable metal tube 150 are welded by a welding part 252. Examples of the welding method of the metal tube 250 include gas welding using hydrogen gas and oxygen gas.

[0164] After welding, a 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 tape immersed in the epoxy resin is wound around it. Further, an adhesive PET tape is wound around these so as to cover them. In this way, the reinforcing portion 254 is formed.

[0165] Thereafter, as shown in FIG. 1, an adhesive PE tape and an adhesive PET tape are wound in this order so as to fill the step between the exposed portion of the cable metal tube 150 and the cable sheath 160. Thereby, a filling portion 256 is formed.

[0166] (S270: Anticorrosion layer forming process) After the metal tube forming step S260, as shown in FIG. 1, an anticorrosion layer 260 made of resin is formed so as to cover the outer periphery of the metal tube 250 as follows.

[0167] First, using a PE tube that has been passed through the first power cable 100a in advance, cover 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 with the PE tube. After covering with the PE tube, heat-shrink the PE tube. Thereby, a first anticorrosion layer 262 is formed.

[0168] After forming the first anticorrosion layer 262, as shown in FIGS. 1 and 10, wind and heat-melt a PE tape so as to cover the step between the axial end of the first anticorrosion layer 262 and the cable sheath 160. Thereby, a first anticorrosion portion 263 is formed.

[0169] Next, using a PE tube that has been passed through the first power cable 100a in advance, cover the outer periphery of the first anticorrosion layer 262, the first anticorrosion portion 263, and a part of the outer periphery of the cable sheath 160 with the PE tube. After covering with the PE tube, heat-shrink the PE tube. Thereby, a second anticorrosion layer 264 is formed.

[0170] After forming the second anticorrosion layer 264, as shown in FIG. 1, a PE tape is wound and heated to melt so as to cover the step between the axial end of the second anticorrosion layer 264 and the cable sheath 160. Thereby, the second anticorrosion portion 265 is formed.

[0171] (S280: Post-treatment process) After the anticorrosion layer forming step S270, if necessary, the following post-treatment is performed.

[0172] As shown in FIG. 1, an adhesive PE tape and an adhesive PET tape are wound in this order so as to cover the axial end (the second anticorrosion portion 265) of the anticorrosion layer 260. Thereby, the cover portion 270 is formed.

[0173] Thus, the connected power cable 10 of the present embodiment is manufactured.

[0174] (4) Effects according to this embodiment According to this embodiment, one or more of the following effects are achieved.

[0175] (a) In this embodiment, by the rotation mechanism 440 in the taping device 40 described above, the tape holder 420 and the tape conveying mechanism 430 are rotated in the circumferential direction of the power cable 100, and the tape 232 is wound around the outer periphery of the power cable 100. Further, by the moving mechanism 450, the tape holder 420, the tape conveying mechanism 430, and the rotation mechanism 440 are moved in the axial direction of the power cable 100 between the pair of cable clamps 410.

[0176] For example, even when the tape 232 is wound around the outer periphery of the power cable 100 a large number of times to form the insulating layer 230 of the cable connection portion 20, the above-described taping device 40 can wind the tape 232 quickly and easily. Thereby, the working time of the insulating layer forming step S230 can be shortened, and the burden on the operator can be reduced. Further, by the above-described taping device 40, the winding state of the tape 232 can be made uniform within the connected power cable 10 regardless of the position of the cable connection portion 20 and the like in the connected power cable 10.

[0177] Thus, by using the taping device 40, it is possible to automatically and stably form at least one layer of the cable connection portion 20 with the tape 232.

[0178] (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 faces in a direction intersecting the axis of the power cable 100.

[0179] Here, as described above, in the cable connection portion 20, in order to form the insulating layer 230 in accordance with the complex outer shape of the layer inside the insulating layer 230, it is preferable to shorten the width of the tape 232 for the insulating layer 230. For this reason, the diameter of the tape roll 234 tends to be large.

[0180] In the tape holder 420 that holds such a tape roll 234, when the axis of the tape roll 234 is parallel to the axis of the power cable 100, the outermost diameter of rotation when rotating the tape holder 420 in the circumferential direction of the power cable 100 increases depending on the diameter of the tape roll 234. Therefore, the taping device 40 may become excessively large.

[0181] On the other hand, in the present embodiment, by directing the axis of the tape roll 234 in a direction (preferably perpendicular direction) intersecting the axis of the power cable 100, even if the diameter of the tape roll 234 used becomes large, the above-described outermost diameter of rotation can be made small regardless of the diameter of the tape roll 234. Thereby, it is possible to suppress the taping device 40 from becoming too large. As a result, it is possible to reduce the device cost and reduce the device space.

[0182] (c) In this embodiment, the rotation mechanism 440 is configured to rotate a plurality of tape holders 420 and a plurality of tape conveyance mechanisms 430 in the circumferential direction of the power cable 100, and wind a plurality of tapes 232 around the outer circumference of the power cable 100. With such a configuration, a plurality of tapes 232 can be wound simultaneously, or at least a part of the plurality of tapes 232 can be wound overlapping each other (so-called lap winding). Thereby, the insulating layer 230 that requires winding of the tape 232 many times can be formed quickly. As a result, it is possible to further shorten the working time of the insulating layer forming step S230.

[0183] (d) In this embodiment, the tape holder 420 is configured to be able to apply a frictional force that suppresses the rotation of the tape roll 234 to the tape roll 234. By increasing the frictional force that suppresses the rotation of the tape roll 234, the tension of the tape 232 can be increased. On the other hand, by reducing the frictional force that suppresses the rotation of the tape roll 234, the tension of the tape 232 can be reduced. In this way, the tension of the tape 232 can be adjusted.

[0184] <Other Embodiments of the Present Disclosure> As described above, the embodiments of the present disclosure have been specifically described. However, the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the gist thereof.

[0185] In the above-described embodiment, the case where the taping device 40 is configured to form the insulating layer 230 has been described. However, the present disclosure is not limited to this case. The taping device 40 may be configured to form other layers that constitute the cable connection portion 20. For example, by changing the tape roll 234 set on the tape holder 420 of the taping device 40, other layers such as the internal semiconductive layer 220 may be formed.

[0186] In the above-described embodiment, the case where the connecting power cable 10 is configured as a submarine cable has been described. However, the connecting power cable 10 may be configured to be laid underground or above ground.

[0187] In the above-described embodiment, one cable connection portion 20 of the connecting power cable 10 has been described. However, the connecting power cable 10 may have a plurality of cable connection portions 20.

[0188] In the above-described embodiment, the case where the conductors 110 are directly welded to each other at the conductor connection portion 210 has been described. However, 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 connection portion 210. However, from the viewpoints of reducing the outer diameter of the conductor connection portion 210 and improving the connection strength, it is preferable that the conductors 110 are directly welded to each other.

[0189] In the above-described embodiment, the case where the filling portion 256 is provided between the exposed portion of the cable metal pipe 150 and the cable sheath 160 has been described. However, the end portion of the cable sheath 160 may be cut in a tapered shape.

[0190] In the above-described embodiment, the case where a plurality of anticorrosion layers 260 are provided in the radial direction of the conductor 110 has been described. However, as long as the anticorrosion property can be ensured, the anticorrosion layer 260 may be a single layer.

[0191] In the above-described embodiment, the case where the anticorrosion layer 260 is constituted by a tube has been described. However, the anticorrosion layer 260 may be constituted by a tape. Further, the anticorrosion layer 260 may be either insulating or semiconductive.

[0192] <Preferred Embodiments of the Present Disclosure> Hereinafter, preferred embodiments of the present disclosure will be appended.

[0193] (Appended Note 1) A pair of cable clamps for gripping a pair of power cables respectively, A tape holder for holding a tape roll having a tape on the outer side in the radial direction of the power cable, A tape transport mechanism for transporting the tape from the tape roll toward the outer periphery of the power cable A rotating mechanism that rotates the tape holder and the tape conveyance mechanism in the circumferential direction of the power cable and winds the tape around the outer circumference of the power cable; A moving mechanism that moves the tape holder, the tape conveyance mechanism, and the rotating mechanism in the axial direction of the power cable between the pair of cable clamps; and a taping device.

[0194] (Appendix 2) The taping device according to Appendix 1, wherein the tape holder holds the tape holder such that the axis of the tape roll faces in a direction intersecting the axis of the power cable. The taping device according to Appendix 1.

[0195] (Appendix 3) The taping device according to Appendix 1 or Appendix 2, wherein the tape conveyance mechanism has a plurality of conveyance rollers that change the conveyance direction of the tape from the tape roll. The taping device according to Appendix 1 or Appendix 2.

[0196] (Appendix 4) The plurality of conveyance rollers include a first conveyance roller having a first rotation axis along the axis of the tape roll, and a second conveyance roller having a second rotation axis along the axis of the power cable, and twist the tape between the first conveyance roller and the second conveyance roller to change the width direction of the tape from a direction along the axis of the tape roll to a direction along the axis of the power cable. The taping device according to Appendix 3.

[0197] (Appendix 5) The taping device further includes a control unit that controls the rotating mechanism and the moving mechanism, and the control unit controls the moving mechanism so as to move the tape holder, the tape conveyance mechanism, and the rotating mechanism while sequentially overlapping a part of the tape wound around the outer circumference of the power cable in the axial direction of the power cable. The taping device according to any one of Appendices 1 to 4.

[0198] (Appendix 6) Further comprising a control unit for controlling the rotation mechanism and the movement mechanism, The control unit controls the movement mechanism so as to repeatedly move the tape holder, the tape conveyance mechanism, and the rotation mechanism between the pair of cable clamps. The taping device according to any one of Appendices 1 to 5.

[0199] (Appendix 7) The control unit controls the movement mechanism so as to gradually expand the repeated movement range outward from the connection points of the pair of power cables. The taping device according to Appendix 6.

[0200] (Appendix 8) A plurality of the tape holders are provided, A plurality of the tape conveyance mechanisms are provided in the same number as the tape holders, The rotation mechanism is configured to rotate the plurality of tape holders and the plurality of tape conveyance mechanisms in the circumferential direction of the power cable to wind a plurality of tapes around the outer circumference of the power cable. The taping device according to any one of Appendices 1 to 7.

[0201] (Appendix 9) The tape holder is configured to be able to apply a frictional force that suppresses the rotation of the tape roll to the tape roll. The taping device according to any one of Claims 1 to 8.

[0202] (Appendix 10) A step of preparing a plurality of power cables, A step of forming at least one cable connection portion by connecting a pair of power cables among the plurality of power cables, Comprising, The step of forming the cable connection part includes a step of forming an insulating layer by winding a tape around the outer circumferences of the pair of power cables using a taping device. In the step of forming the insulating layer, As the taping device, a pair of cable clamps for gripping each of the pair of power cables, a tape holder for holding a tape roll having the tape on the outer side in the radial direction of the power cable, a tape conveying mechanism for conveying the tape from the tape roll toward the outer circumference of the power cable, a rotating mechanism for rotating the tape holder and the tape conveying mechanism in the circumferential direction of the power cable to wind the tape around the outer circumference of the power cable, a moving mechanism for moving the tape holder, the tape conveying mechanism, and the rotating mechanism in the axial direction of the power cable between the pair of cable clamps, using a device including A method for manufacturing a connected power cable.

Explanation of Signs

[0203] 10 Connected power cable 20 Cable connection part 40 Taping device 50 Crosslinking device 100 Power cable 100a First power cable 100b Second power cable 110 Conductor 112 Conductor strand 114(114a~114f) Conductor strand layer 120 Inner semi-conductive layer of cable 130 Cable insulating layer 140 Outer semi-conductive layer of cable 150 Cable metal tube 160 Cable sheath 210 Conductor connection part 212 Welded part 220 Inner semi-conductive layer 230 Insulation layer 232 Tape 234 Tape roll 240 External semiconductive layer 242 Water-absorbing tape layer 244 Heat insulation part 250 Metal pipe 252 Weld part 254 Reinforcement part 256 Filling part 260 Anticorrosion layer 260a Bulging part 262 First anticorrosion layer 263 First anticorrosion part 264 Second anticorrosion layer 265 Second anticorrosion part 270 Cover part 310 Air nozzle 320 Ring 410 Cable clamp 420(420a, 420b) Tape holder 430(430a, 430b) Tape conveying mechanism 432 First conveying roller 433 First rotating shaft 434 Second conveying roller 435 Second rotating shaft 440 Rotating mechanism 442 Rotating cylinder 442g Gear 444 Motor 450 Moving mechanism 452 Rail 454 Block 462 Support stand 464 Lifting mechanism 466 Cart 490 Control unit 510 Heating furnace 520 Heater 530 Gas supply line

Claims

1. A pair of cable clamps for gripping a pair of power cables respectively, a tape holder for holding a tape roll having a tape on the outer side in the radial direction of the power cable, a tape conveyance mechanism for conveying the tape from the tape roll toward the outer periphery of the power cable, a rotation mechanism for rotating the tape holder and the tape conveyance mechanism in the circumferential direction of the power cable to wind the tape around the outer periphery of the power cable, a movement mechanism for moving the tape holder, the tape conveyance mechanism, and the rotation mechanism in the axial direction of the power cable between the pair of cable clamps, comprising: The tape holder holds the tape holder so that the axis of the tape roll faces in a direction intersecting the axis of the power cable. A taping device.

2. A plurality of the tape holders are provided. A plurality of the tape conveyance mechanisms are provided in the same number as the tape holders. The rotation mechanism is configured to rotate the plurality of tape holders and the plurality of tape conveyance mechanisms in the circumferential direction of the power cable to wind a plurality of tapes around the outer periphery of the power cable. The taping device according to claim 1.

3. The tape holder is configured to be able to apply a frictional force that suppresses the rotation of the tape roll to the tape roll. The taping device according to claim 1 or claim 2.

4. A step of preparing a plurality of power cables, a step of forming at least one cable connection portion by connecting a pair of the power cables among the plurality of power cables, comprising: The step of forming the cable connection portion includes a step of forming an insulating layer by winding a tape around the outer peripheries of the pair of power cables using a taping device. In the step of forming the insulating layer, As the taping device, a pair of cable clamps for gripping a pair of power cables respectively, a tape holder for holding a tape roll having the tape on the outer side in the radial direction of the power cable, a tape conveyance mechanism for conveying the tape from the tape roll toward the outer periphery of the power cable, a rotation mechanism for rotating the tape holder and the tape conveyance mechanism in the circumferential direction of the power cable to wind the tape around the outer periphery of the power cable, A moving mechanism for moving the tape holder, the tape conveyance mechanism, and the rotating mechanism in the axial direction of the power cable between the pair of cable clamps; comprising; a device for holding the tape holder such that the axis of the tape roll faces in a direction intersecting the axis of the power cable; A method for manufacturing a connected power cable.

Images