JP2575299Y2 - Insulating cylinder expansion jig - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for expanding an insulating cylinder used in forming a prefabricated connection portion of a plastic power cable.

[0002]

FIG. 8 shows a problem to be solved by the prior art and the invention.
FIG. 1 is a longitudinal sectional view of an example of a prefabricated connection portion of a plastic power cable such as a crosslinked polyethylene insulated power cable. In the drawings, 10 is a plastic power cable, 11 is a cable conductor, 12 is a cable insulator such as cross-linked polyethylene, 13 is an outer semiconductive layer of the cable, and 14 is a plastic sheath such as vinyl chloride. Reference numeral 15 denotes a connection sleeve made of copper, aluminum, or the like for compressing or crimping the cable conductor 11. Reference numeral 16 denotes an insulating cylinder including a conductor connecting portion formed by the connection sleeve 15 and provided over the cable insulator 12.

The insulating tube 16 has an inner semiconductive layer 16a inside.
It is formed of insulating rubber having an outer semiconductive layer 16b on the outside that is electrically connected to the outer semiconductive layer 13 of the cable. The inner diameter of the insulating tube 16 is formed smaller than the outer diameter of the cable insulator 12, and is expanded in the radial direction using a jig or the like and inserted into the cable 10 in advance. After connecting the cable conductor 11 using the above, the previously inserted insulating tube 16 is moved together with the jig to the center of the connection portion, and then the jig is removed and the insulating tube is removed.
The rubber elastic force of 16 closely attaches to the cable insulator 12. 17 is the cable sheath on both sides outside the insulating tube 16
14, an external protective layer such as a heat-shrinkable tube applied over
Reference numerals 18 and 19 denote an insulating tape winding layer and a waterproof tape winding layer provided between the outer protective layer 17 and the cable sheath 14.

As described above, to form the prefabricated connection portion, an insulating cylinder having an inner diameter smaller than the outer diameter of the cable insulator is used, and the insulating cylinder is enlarged using a jig or the like and inserted into the cable insulator. However, due to its elastic force, a method of closely attaching it to the cable insulator has been adopted, but a suitable tool for expanding the insulating cylinder has not been developed yet, and development of an easy-to-handle tool has been developed. Was requested.

[0005]

SUMMARY OF THE INVENTION The present invention provides an insulation tube enlarging jig which solves the above-mentioned problems.
2 having an opening on one side on both sides of a plurality of connecting shafts
The connecting plates are opposed to each other, and are slidably mounted on the connecting shaft by the operation of the cylinder, and the connecting plates are each provided with an expanding metal fitting that is inserted into an insulating cylinder and expanded. The enlarged metal fitting has a sheath tube having an outer diameter larger than the inner diameter of the insulating cylinder and having a tapered diameter reduced toward the tip, and a warhead located at the tip of the sheath tube. This warhead passes through the inside of the sheath tube from the opening
That it can be pulled out .

[0006]

FIG. 1 is a structural view of a concrete example of an insulation tube enlarging jig according to the present invention, and is a front view showing a partial cross section of a state where an enlarged metal fitting is inserted into an insulation tube. FIG. 2 (a) shows X ₁ − in FIG.
X ₁ arrow view, FIG. 2 (b) is X ₂ -X ₂ cross-sectional view taken along FIG. FIG. 3 is a front view showing the upper half longitudinal section of the enlarged metal fitting in the present invention.

[0007] In the drawings, reference numeral 1 denotes an insulating cylinder made of insulating rubber, the inner diameter of which is smaller than the outer diameter of the cable insulator. Numeral 2 denotes an enlarged metal fitting, as shown in FIG. 3, which comprises a cylindrical sheath tube 21 and a warhead 22 located at the tip thereof. The sheath tube 21 forms a taper whose diameter is reduced toward the tip, and its base 25
Has a bolt hole 27 for fixing to the engaging portion 26 of the center core 23 and the connecting plate 5. The warhead 22 is formed integrally with a core 23 passing through the center of the sheath tube 21, and a base 28 of the core 23 is engaged with an engagement portion 26 of the sheath tube base 25 by an engagement projection 29. By disengaging the two, the warhead 22 and the core 23 can be pulled out of the sheath tube 21 to separate them. Reference numeral 24 denotes a handle integrally formed on the base 28 of the core 23 for pulling out the core 23.

[0008] A pair of the above-mentioned expanding fittings 2 is a sheath tube 21.
The two connecting plates 5 are opposed to each other by bolts inserted into the bolt holes 27 of the connecting plates 5.
Is slidably mounted on the connecting shaft 6 by a double-acting cylinder 4 on a plurality of connecting shafts 6. Therefore, the expansion bracket 2 can be moved forward and backward by the operation of the cylinder 4. In the figure, 4A is a cylinder for the enlarged bracket on the left side of the figure, and 4B is a cylinder for the enlarged bracket on the right side of the figure. Reference numeral 3 denotes a set fitting of the insulating cylinder 1 which is attached to the shaft 7 by a flange portion 31 thereof.

[0009]

FIGS. 4 to 7 are explanatory views of the procedure for mounting the insulating cylinder on the cable. FIG. 4A is a diagram showing a state before the enlarged metal fitting 2 is inserted into the insulating cylinder 1, and FIG. 4B is a diagram showing a state where the enlarged metal fitting 2 is inserted into the insulating cylinder 1 and the insulating cylinder 1 is enlarged. The enlarging metal fitting 2 is advanced by operating the cylinder 4, and the left and right enlarging metal fittings 2 are inserted into the insulating cylinder 1. At this time, the expansion bracket 2
Has a warhead 22 at its distal end, and has a tapered portion with a diameter reduced toward the distal end of the sheath tube 21, so that it can be easily inserted.

Next, the base 25 of the sheath tube 21 of the above-mentioned metal fitting 2 is enlarged.
Then, the engagement of the base 28 of the core 23 is released, the handle 24 is pulled, and the warhead 22 is pulled out together with the core 23 as shown in FIG.
Then, as shown in FIG. 5B, the mounting bolt of the base portion 25 of the sheath tube 21 is removed, removed from the connecting plate 5, and separated.

Next, as shown in FIG. 6A, the cable 10 is inserted into the inside of the sheath tube 21 which has been pulled out of the warhead 22 and the core 23 and becomes hollow, and the positioning is performed.
As shown in (b), it is mounted on the connecting plate 5 again. After a while
Operate the cylinder 4 in the opposite direction to the previous direction, and
As described above, the sheath tube 21 is retracted in the direction of the arrow, and the sheath tube 21 is pulled out. At this time, since the sheath tube 21 has a split structure, it can be easily removed from the cable. As a result, the insulating cylinder 1 can be closely attached to a predetermined position of the cable 10 as shown in FIG.

[0012]

As described above, according to the insulation tube enlarging jig of the present invention, the two expansion brackets are opposed to each other, and the insertion is enlarged from the left and right sides of the insulation tube. It is lightweight, compact and easy to handle.
In addition, since the sheath tube of the expansion fitting has a tapered shape whose diameter is reduced toward the tip, and the tip portion has a warhead, it is easy to insert and expand into the insulating cylinder, and by the taper of the sheath tube, It has an advantage that the sheath tube can be easily pulled out by the rubber elastic pressure of the insulating tube even when the sheath tube is pulled out.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a specific example of an insulation tube enlarging jig of the present invention;
It is the front view showing the partial cross section in the state where the expansion metal fitting was inserted in the insulating cylinder.

Figure 2 (b) is X ₁ -X ₁ arrow view of FIG. 1, FIG. 2 (b)
Is X ₂ -X ₂ cross-sectional view taken along FIG.

FIG. 3 is a front view showing an upper half section of the enlarged metal fitting in the present invention.

4A and 4B are explanatory diagrams of a procedure for mounting an insulating cylinder on a cable. FIG. 4A is a diagram showing a state before an enlarged metal fitting is inserted into the insulating cylinder, and FIG. It is the state figure which expanded the insulating cylinder.

FIG. 5 is an explanatory view of a procedure for mounting an insulating tube on a cable. FIG. 5 (a) is a diagram showing a state in which a warhead of an enlarged metal fitting is removed together with a core, and FIG. 5 (b) is a connection of a sheath tube. It is the state figure detached from the board and separated.

6 (a) and 6 (b) are explanatory views of the procedure for mounting the insulating cylinder on the cable, wherein FIG. 6 (a) is a diagram showing a state in which the cable is inserted into the sheath tube of the enlarged fitting, and FIG. Do,
FIG. 9 is a diagram illustrating a state in which the camera is mounted on the connection plate again.

7A and 7B are explanatory diagrams of a procedure for mounting an insulating tube on a cable. FIG. 7A is a diagram showing a state of extracting a sheath tube of an enlarged fitting, and FIG. FIG. 4 is a diagram illustrating a state in which an insulating tube is mounted on a cable.

FIG. 8 is a longitudinal sectional view of an example of a prefabricated connection portion of a plastic power cable.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation cylinder 2 Expansion bracket 21 Sheath tube 22 Warhead 23 Core 24 Handle 3 Set bracket 4 Double-acting cylinder 5 Connecting plate 6 Connecting shaft

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-193518 (JP, A) JP-A-2-197208 (JP, A) JP-A-62-28374 (JP, A) 4716 (JP, U) US Patent 4,126,927 (US, A) British Patent 1,1280,74 (GB, A) European Patent Application Publication 149032 (EP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02G 1 / 14 H02G 15/00-15/196

Claims (1)

(57) [Scope of request for utility model registration] 1. On both sides of a plurality of connecting shafts, two connecting plates having openings on one side are opposed to each other and slidably mounted on the connecting shaft by operation of a cylinder. Each of the connecting plates is provided with an enlarged metal fitting which is inserted into the insulating cylinder and expands it, and the enlarged metal fitting has an outer diameter larger than the inner diameter of the insulating cylinder and is reduced in diameter toward the tip. It has a tapered sheath tube and a warhead located at the tip of the sheath tube, and the warhead passes through the inside of the sheath tube.
A jig for expanding an insulating cylinder, wherein the jig can be removed from the opening .