Crimping device

Abstract

To provide a crimping device that prevents interference with adjacent underground cables when crimping sleeves onto the ends of underground cables constituting a three-phase cable, thereby enabling improved work efficiency.SOLUTION: A crimping device 200 for crimping a sleeve 120 onto the end of a three-phase cable 100 cut within a manhole 30 includes a fixed die 210, a movable die 220, and a drive source 230 for moving the movable die 220 toward and away from the fixed die 210. The fixed die 210 is characterized by having two or more escape holes 216a to 216d formed, into which the remaining two cables are inserted when one of the three cables constituting the three-phase cable 100 is positioned on the crimping surface (fixed-side crimping surface 214) of the fixed die 210.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a crimping device for crimping a sleeve onto the end of a three-phase cable cut in a manhole. [Background technology]

[0002] In recent years, underground cabling has become increasingly common in cities due to considerations of aesthetics and safety. In underground cabling, troughs and conduits are buried underground, and power cables, communication cables, etc. (hereinafter referred to as underground cables) are laid inside them. Underground cables are removed when they deteriorate over time or are no longer needed.

[0003] As a method for removing an underground cable, for example, Patent Document 1 discloses a "method for removing an underground ultra-high voltage power transmission cable that has been laid for a long time in an underground conduit connecting two manholes." The underground ultra-high voltage power transmission cable removal method in Patent Document 1 includes "a step of providing a temporary hook in the earthen floor of a manhole that has the terminal end of one of the two ends of the power transmission cable that needs to be removed, both ends of which have been cut in advance, a step of connecting a hydraulic jack to the temporary hook, a step of connecting the terminal end of the power transmission cable to the hydraulic jack, and a step of driving the hydraulic jack and using its pulling force to pull the power transmission cable from the conduit into the manhole against lateral pressure and its own weight pressure." [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7177537 Summary of the Invention [Problem to be solved by the invention]

[0005] When removing an underground cable from a manhole, the joints connecting the cables are first disassembled and removed inside the manhole. In Patent Document 1, a pulling eye is attached to the end of the three-phase cable that has been cut off from the joints, and the pulling eye is then pulled by a pulling machine such as a hydraulic jack to pull the underground cable out of the conduit.

[0006] When there is only one underground cable, it is easy to attach a pulling eye to its end, specifically, to crimp the pulling eye (hereinafter referred to as a sleeve) onto the end of the underground cable. However, when the power transmission system is a three-phase, three-wire system, three (three-phase) underground cables are buried underground as one circuit. Therefore, when crimping a sleeve onto one (first-phase) underground cable, the other two (second-phase) cables interfere with the crimping device, making the work time-consuming and reducing work efficiency.

[0007] In particular, POF cables (Pipe-type Oil-Filled cables) do not require offsetting during installation, so their splice size is larger relative to the manhole size than other cables. Therefore, after the splice is cut off, the excess cable length (work allowance) at the end of the three-phase cable inside the manhole is shorter. For this reason, with three-phase cables, the other two cables are more likely to interfere with the work of crimping a sleeve onto one underground cable than with other cables, which has been a problem, significantly reducing work efficiency.

[0008] In view of these problems, the present invention aims to provide a crimping device that can prevent interference with other adjacent underground cables when crimping a sleeve onto the end of an underground cable that constitutes a three-phase cable, thereby improving work efficiency. [Means for solving the problem]

[0009] In order to solve the above problems, a typical configuration of a crimping device according to the present invention is a crimping device that crimps a sleeve onto the end of a three-phase cable cut inside a manhole, and is characterized in that it comprises a fixed die, a movable die, and a drive source that moves the movable die toward and away from the fixed die, and the fixed die has two or more escape holes formed therein into which the remaining two cables that make up the three-phase cable can be inserted when one cable is placed on the crimping surface of the fixed die.

[0010] It is preferable to provide a rotating device that rotates the fixed die and movable die around an axis that is the extension direction of the three-phase cable, a vertical movement device that moves the fixed die and movable die perpendicular to the extension direction of the three-phase cable and in an up and down direction, and a horizontal movement device that moves the fixed die and movable die horizontally. [Effects of the Invention]

[0011] According to the present invention, a crimping device can be provided that can prevent interference with other adjacent underground cables when crimping a sleeve onto the end of an underground cable that constitutes a three-phase cable, thereby improving work efficiency. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram illustrating a work site where a three-phase cable is removed. [Figure 2] FIG. 1 is a diagram illustrating a three-phase cable. [Figure 3] 10A and 10B are diagrams illustrating a sleeve attached to the end of an underground cable. [Figure 4] 1 is a diagram illustrating a crimping device according to an embodiment of the present invention; [Figure 5] 10A to 10C are diagrams illustrating the operation of the crimping device when crimping a sleeve onto an underground cable. [Figure 6] 10A and 10B are diagrams illustrating the work performed after the sleeve is crimped onto the underground cable. DETAILED DESCRIPTION OF THE INVENTION

[0013] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Dimensions, materials, and other specific values ​​shown in the embodiments are merely examples for facilitating understanding of the invention and, unless otherwise specified, do not limit the present invention. In this specification and drawings, elements having substantially the same functions and configurations are designated by the same reference numerals to avoid redundant explanation, and elements not directly related to the present invention are not shown.

[0014] Figure 1 is a diagram illustrating a work site 10 where a three-phase cable 100 is to be removed. As shown in Figure 1, at the work site, conduits 20 are buried under a road surface 12, and manholes 30 for maintenance work are provided at predetermined intervals between the conduits 20.

[0015] 2A and 2B are diagrams illustrating a three-phase cable 100, with Fig. 2A being a cross-sectional view and Fig. 2B being a perspective view of the three-phase cable 100 (three underground cables 102). As shown in Figs. 1 and 2, the three-phase cable 100 (for example, a POF cable) is laid inside a conduit 20. In the case of a POF cable, insulating oil (not shown) is filled inside the conduit 20 and pressurized.

[0016] As shown in Fig. 2(a), a three-phase cable 100 is made up of three underground cables 102a, 102b, and 102c. As shown in Fig. 2(b), the three underground cables 102a, 102b, and 102c have conductors 106 (segmented conductors) covered on their outer peripheries with sheaths 108, and skid wires 104 wound around the outer peripheries of the sheaths 108. In the following description, the three underground cables 102a, 102b, and 102c will be referred to as underground cables 102 unless otherwise distinguished.

[0017] When removing the three-phase cable 100, first, the joints (not shown) connecting the three-phase cables 100 to the multiple conduits 20 connected to the manhole 30 are cut off and disassembled. Then, the end of the three-phase cable 100 cut off from the joints is pulled by a puller 400 (see FIG. 6 ), thereby pulling the three-phase cable 100 from the conduits 20.

[0018] Figure 3 is a diagram illustrating a sleeve 120 attached to the end of the underground cable 102. Figure 3(a) is a cross-sectional view of the sleeve 120. Figures 3(b) and 3(c) are diagrams illustrating the attachment of the sleeve 120 to the end of the underground cable 102.

[0019] As described above, a sleeve 120 as shown in Fig. 3(a) is attached to the end of the three-phase cable 100 whose connection has been cut off inside the manhole 30, i.e., the end of the three underground cables 102. The sleeve 120 has an insertion hole 122 into which the conductors at the end of the underground cables 102 can be inserted, and an I-bolt 124 is connected to the tip.

[0020] When attaching the sleeve 120 to the end of the underground cable 102, first, the coating 108 (resin) is stripped from the end of the underground cable 102 to expose the conductor 106 (metal). Next, as shown in Fig. 3(b), the exposed conductor 106 is inserted into the insertion hole 122 of the sleeve 120. Then, as shown in Fig. 3(c), a plurality of crimped portions 126 (for example, six portions) are formed in the sleeve 120, thereby crimping and attaching the sleeve 120 to the end of the underground cable 102.

[0021] Fig. 4 is a diagram illustrating a crimping device 200 according to this embodiment. Fig. 4(a) is a front view of the crimping device 200, and Fig. 4(b) is a side view of the crimping device 200. The crimping device 200 according to this embodiment shown in Figs. 4(a) and 4(b) is a device that crimps a sleeve 120 onto the end of a three-phase cable 100 (underground cable 102) that has been cut inside a manhole 30. In the following description, the extension direction of the three-phase cable 100 is designated as D1, the rotation direction about the extension direction D1 as an axis is designated as D2, the vertical direction perpendicular to the extension direction is designated as D3, and the horizontal direction perpendicular to the extension direction is designated as D4.

[0022] The crimping device 200 of this embodiment includes a fixed die 210, a movable die 220 movably connected to the fixed die 210, and a drive source 230 that drives the movable die 220. The fixed die 210 is held by a rotation device 250 and is a substantially U-shaped member having a slide groove 212 in which the movable die 220 can slide. The fixed die 210 also has a crimping surface (hereinafter referred to as a fixed-side crimping surface 214) at the end of the slide groove 212 on which the underground cable 102 is placed.

[0023] The movable die 220 is a member that can slide within the slide groove 212 of the fixed die 210, and the surface that faces the fixed-side crimping surface 214 of the fixed die 210 is a crimping surface (hereinafter referred to as the movable-side crimping surface 224). The movable die 220 is connected to a driving source 230, and is driven by the driving source 230 to move in a direction toward and away from the fixed die 210.

[0024] A feature of the crimping device 200 of this embodiment is that the fixed die 210 has four escape holes 216a, 216b, 216c, and 216d formed therein into which the remaining two underground cables 102 are inserted when one of the three underground cables 102 that make up the three-phase cable 100 is positioned between the fixed side crimping surface 214 and the movable side crimping surface 224.

[0025] When viewed from the end face direction, the three underground cables 102 are located at the vertices of an equilateral triangle. Therefore, when the crimping position (between the fixed-side crimping surface 214 and the movable-side crimping surface 224) is taken as one vertex of the equilateral triangle, the relief holes 216a, 216b, 216c, and 216d are provided at the positions of the other two vertices. Note that, although this embodiment illustrates a configuration in which four relief holes 216a-216d are formed in the fixed die 210, the minimum number of relief holes can be reduced to two by moving the position and angle of the fixed die 210 more than described below.

[0026] As shown in Figure 4, the crimping device 200 of this embodiment further includes a rotation device 250 (movement in the D2 direction) that rotates or moves the fixed die 210 and the movable die 220, a vertical movement device 260 (movement in the D3 direction), and a horizontal movement device 270 (movement in the D1 and D4 directions).

[0027] The rotation device 250 rotates the fixed die 210 and the movable die 220 in a rotation direction D2 (in a plane perpendicular to the extension direction D1 of the three-phase cable 100) around the axis of the extension direction D1 of the three-phase cable 100. The rotation device 250 of this embodiment is configured to include an outer frame 252, an inner frame 254, and rollers 256.

[0028] The outer frame 252 is a circular member arranged on the front and rear sides of the fixed die 210 and the movable die 220, and is fixed to the frame 240. The inner frame 254 is a circular member arranged inside the outer frame 252, and is fixed to the fixed die 210. The rollers 256 are fixed to the outer frame 252 and support the edges of the inner frame 254 so that they can run.

[0029] According to the above configuration, when the handle 232 of the drive source 230 is rotated in the D2 direction, the fixed die 210, the movable die 220, and the drive source 230 rotate together. This allows the angle of the fixed die 210 relative to the three underground cables 102 (i.e., the positions of the relief holes 216a-d) to be rotated.

[0030] The vertical movement device 260 moves the fixed die 210 and the movable die 220 in a vertical direction D3 perpendicular to the extension direction D1 of the three-phase cable 100. In this embodiment, the vertical movement device 260 is a jack arranged between the bottom plate 242 of the frame 240 and the base 244. Thus, by extending or contracting the jack, which is the vertical movement device 260, the frame 240 moves up and down relative to the base 244, and the fixed die 210 and the movable die 220 can be moved up and down.

[0031] The horizontal movement device 270 moves the fixed die 210 and the movable die 220 in horizontal directions (the extending direction D1 of the three-phase cable and the perpendicular direction D4). In this embodiment, the horizontal movement device 270 is, for example, a caster attached to the underside of the pedestal 244. This allows the fixed die 210 and the movable die 220 to be moved horizontally together with the frame 240 supported by the pedestal 244.

[0032] 5A and 5B are diagrams illustrating the operation of the crimping device 200 when crimping the sleeve 120 onto the underground cable 102. When crimping the sleeve 120 onto three underground cables 102, first, the fixed die 210 and the movable die 220 of the crimping device 200 are separated from each other as shown in FIG.

[0033] The crimping device 200 is moved in the extending direction D1 of the three-phase cable, and the underground cable 102a, the tip of which is covered with the sleeve 120 (see FIG. 3(b)), is inserted into the crimping position (between the fixed-side crimping surface 214 and the movable-side crimping surface 224). At this time, the remaining two underground cables 102b and 102c are inserted into the relief holes 216b and 216c, respectively, and are then retracted. This allows the underground cable 102a to be crimped to be inserted into the crimping position without the remaining two underground cables 102b and 102c hitting the fixed die 210.

[0034] Then, the drive source 230 moves the movable die 220 close to the fixed die 210, and the sleeve 120 is crimped by the fixed crimping surface 214 and the movable crimping surface 224, thereby crimping the sleeve 120 onto the underground cable 102a (see FIG. 3(c)).

[0035] After the sleeve 120 has been crimped onto the underground cable 102a, the crimping device 200 is moved in the direction D1 and removed from the three underground cables 102. Next, as shown in FIG. 5(b), the fixed die 210 and the movable die 220 are rotated 180 degrees relative to the frame 240 by the rotation device 250 (turned upside down).

[0036] Then, the horizontal movement device 270 moves the fixed die 210 and the movable die 220 horizontally to the right in the figure, and the vertical movement device 260 moves the fixed die 210 and the movable die 220 downward in the figure. This completes the alignment of the underground cable 102c with the fixed-side crimping surface 214 of the fixed die 210.

[0037] After the alignment is complete, the crimping device 200 is moved in the direction D1, and the underground cable 102c is inserted into the crimping position, and the remaining two underground cables 102a and 102b are inserted into the relief holes 216c and 216d, respectively, and then retracted. Then, as described above, the movable die 220 is brought close to the fixed die 210 to crimp the sleeve 120, thereby crimping the sleeve 120 onto the underground cable 102c.

[0038] After the sleeve 120 has been crimped onto the underground cable 102c, the crimping device 200 is removed from the three underground cables 102, and the fixed die 210 and the movable die 220 are moved horizontally to the left in the drawing by the horizontal movement device 270, as shown in Figure 5(c). This completes the alignment of the underground cable 102b with the fixed-side crimping surface 214 of the fixed die 210.

[0039] Once the alignment is complete, the crimping device 200 is moved in the D1 direction, and the underground cable 102b is inserted into the crimping position, and the remaining two underground cables 102a and 102c are inserted into the relief holes 216b and 216a, respectively, and then retracted. Then, as described above, the movable die 220 is brought close to the fixed die 210 to crimp the sleeve 120 and crimp the sleeve 120 onto the underground cable 102b. This results in the sleeve 120 being crimped onto the three underground cables 102.

[0040] As described above, according to the crimping device 200 of this embodiment, when the sleeve 120 is being crimped onto one of the three underground cables 102 that make up the three-phase cable 100, the other cables can be retracted into the relief holes 216a-d of the fixed die 210. This makes it possible to suitably prevent interference with the other cables when crimping one underground cable, thereby improving work efficiency.

[0041] 6 is a diagram illustrating the work performed after the sleeves 120 have been crimped onto the underground cables 102. After the sleeves 120 have been crimped onto the three underground cables 102 using the crimping device 200 of this embodiment as described above, the three underground cables 102 are pulled out together by the pulling machine 400 and paid out from the ground into the guide pipe 50 inserted into the manhole 30. The pulling machine 400 is then moved back and forth to repeat the pulling and paying out process, so that the three underground cables 102 are pushed out of the guide pipe 50, out of the manhole 30, and sent out onto the ground.

[0042] A transport vehicle 40 is placed on the ground, and a cable cutting device 500 is loaded on the bed of the transport vehicle 40. The underground cable 102 sent out onto the ground is guided to the cable cutting device 500 by the end of a guide pipe 50, and is cut by the cable cutting device 500 to a length that can be loaded on the bed of the transport vehicle 40. By cutting the underground cable 102 on the bed of the transport vehicle 40 in this way, the cut three-phase cable 102 can be transported directly by the transport vehicle 40. This makes it possible to improve the efficiency of the transport work and simplify the equipment.

[0043] Although the above description has been given using an example in which the three-phase cable 100 is a POF cable, the crimping device 200 of this embodiment can be applied to other cables besides POF cables, such as OF cables (Oil Filled cables) and CV (Cross-linked polyethylene insulated vinyl sheath) cables. That is, not only for POF cables but also for other cables, when crimping a sleeve onto the end of an underground cable that constitutes a three-phase cable, interference with other adjacent underground cables can be prevented, and work efficiency can be improved.

[0044] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to these examples. It is clear that those skilled in the art can conceive of various modifications and alterations within the scope of the claims, and it is understood that these modifications and alterations also fall within the technical scope of the present invention. [Industrial Applicability]

[0045] The present invention can be used in a crimping device that crimps a sleeve onto the end of a three-phase cable that has been cut inside a manhole. [Explanation of symbols]

[0046] D1...extension direction, 10...work site, 12...road surface, 20...pipe, 30...manhole, 40...transport vehicle, 50...guide pipe, 100...three-phase cable, 102...underground cable, 102a...underground cable, 102b...underground cable, 102c...underground cable, 104...skid wire, 106...conductor, 108...coating, 120...sleeve, 122...insertion hole, 124...I-bolt, 200...crimping device, 210...fixing die, 212 ...slide groove, 214...fixed side crimping surface, 216a...relief hole, 216b...relief hole, 216c...relief hole, 216d...relief hole, 220...movable die, 224...movable side crimping surface, 230...driving source, 232...handle, 240...frame, 242...bottom plate, 244...base, 250...rotating device, 252...outer frame, 254...inner frame, 256...roller, 260...vertical movement device, 270...horizontal movement device, 400...pulling machine, 500...cable cutting device

Claims

1. A crimping device for crimping a sleeve onto the end of a three-phase cable cut in a manhole, Fixed dice and A movable die; a drive source that moves the movable die toward and away from the fixed die; Equipped with The crimping device is characterized in that the fixed die has two or more escape holes formed therein into which the remaining two cables that make up the three-phase cable are inserted when one of the cables is placed on the crimping surface of the fixed die.

2. a rotating device that rotates the fixed die and the movable die around an axis that is the extension direction of the three-phase cable; a vertical movement device that moves the fixed die and the movable die in a vertical direction perpendicular to the extending direction of the three-phase cable; a horizontal movement device that moves the fixed die and the movable die in a horizontal direction; The crimping device according to claim 1, further comprising:

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