JP3020391B2 - Cable insulator protection device and cable insulator protection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable connecting device and a cable connecting method, and more particularly, to a cable insulator protecting device and a cable insulating protecting method for protecting a peripheral surface of a cable insulator when connecting a cable conductor.

[0002]

2. Description of the Related Art Generally, when a long line for transmitting or distributing electric power is long, the length of a cable constituting the line is limited due to manufacturing, transportation, and installation reasons. A (continuous one) cable cannot be used, and it is necessary to provide a connection portion (also called a connection box) using a plurality of cables. As one of the connecting portions, a pre-molded insulator of a cable connecting component for reducing electric field concentration and an epoxy unit for accommodating the pre-molded insulator are formed in advance, and they cover the conductor connection end. There are prefabricated types that are arranged as follows. Conventionally, a cable connecting device used for assembling this prefabricated type connecting portion and a cable connecting method using the device are as shown in FIGS. 4 (a), 4 (b) and 4 (c). In addition, FIG.
Cables a shown in FIGS. 1B and 1C are obtained by covering a cable insulator a2 covered by a cable conductor a1 with a semiconductive layer or a shielding layer indicated by reference numeral a3. Prior to the connection of the cable a, the semiconductive layer and the shielding layer indicated by the symbol a3 at the end of the cable a are peeled off.

First, as shown in FIG. 4A, a pre-mold insulator b is attached to a cable insulator a2 at an end of a cable a. Thereafter, the pre-molded insulator b is moved from the end of the cable insulator a2 toward the center by an appropriate distance (the distance indicated by the symbol A) using the mounting jig c, and then the mounting jig c is moved. Remove the tool c.

Next, as shown in FIG. 4 (b), a protective tape d is wrapped around an exposed portion (a portion corresponding to the distance A) of the peripheral surface of the cable insulator a2, and the cable is insulated during the connection operation. Protects the body a2 from being injured or adhering to foreign matter. Then, the end of the cable a and the pre-molded insulator b
Is accommodated in the hollow hole of the epoxy unit e. That is, the epoxy unit e has a substantially cylindrical shape, has a through-hole e1 along its central axis, and communicates with the through-hole e1 at both ends thereof and accommodates the pre-mold insulator b. And space portions e2 and e2 having a shape corresponding to the outer shape of the insulator b. To accommodate the epoxy unit e, the cable insulator a2 is inserted into the through hole e1 of the epoxy unit e, and the pre-mold insulator b is fitted to the accommodation portion e2 of the epoxy unit e.

[0005] Then, another cable f shown in FIG.
Cable conductor f1 and the cable conductor a of the cable a
As shown in FIG. 4 (c), after connecting the epoxy unit e and the pre-molded insulator b in the direction of the sleeve g, after connecting the epoxy unit e and the pre-molded insulator b with each other, as shown in FIG.

[0006]

However, the cable connecting device and the cable connecting method in assembling the conventional prefabricated connecting portion have the following problems. That is, in order to move the pre-mold insulator b from the end of the cable insulator a2 by the distance A, remove the mounting jig c, and wrap the protective tape d around the exposed portion of the peripheral surface of the cable insulator a2. , Pre-mold insulator b
The exposed portion remains exposed from the time when the wire passes over the cable insulator a2 until the winding of the protective tape d is completed.

[0007] Therefore, during the operation, there is a risk that, during the operation, external damage may occur or foreign matter may adhere to the exposed portion of the cable insulator a2, which is particularly important in terms of electrical performance. Further, it is conceivable to reduce the time during which the exposed portion of the cable insulator a2 is exposed by improving the work setup and the like, but it is not possible to eliminate the exposure time at all. In addition, the work of winding the protective tape d around the exposed portion and the work of peeling off the tape d after it becomes unnecessary become troublesome.

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems, and it is an object of the present invention to provide a method for connecting a cable conductor to a peripheral surface of a cable insulator, which may cause damage or foreign matter during operation. It is an object of the present invention to provide a cable insulator protection device and a cable insulator protection method for surely protecting the device from being attached.

[0009]

The present invention has the following arrangement to achieve the above object. That is, according to the first aspect of the present invention, a pre-molded insulator for reducing electric field concentration is mounted at a predetermined position on a peripheral surface of a cable insulator covered with a conductor in a cable. In a cable connection device provided with a jig for mounting a pre-molded insulator to be moved on the peripheral surface of the insulator, a device for protecting the cable insulator, wherein the cable insulator passed through the pre-molded insulator A protection member for covering the passage portion on the peripheral surface, wherein the protection member and the mounting jig have an engagement portion that engages with each other to move the protection member together with the mounting jig; The engaging portion engages the protective member with the mounting jig when the pre-mold insulator is moved toward a predetermined position by pressing the pre-mold insulator with the mounting jig. Predetermined After reaching the position, the mounting jig can be removed from the cable while releasing the engagement and leaving the protective member on the peripheral surface of the cable insulator. Device.

According to a second aspect of the present invention, there is provided a first step of preparing for mounting a pre-mold insulator for reducing electric field concentration on a peripheral surface of a cable insulator covered with a conductor in a cable; Moving the pre-molded insulator to a predetermined position on the peripheral surface of the cable insulator using an insulator mounting jig. In the first step, a cylindrical protective member through which the cable can be inserted is installed near an end of the cable insulator so as to be coaxial with the cable, and the mounting jig is Engaging the protection member, in a second step, using the mounting jig, moving the pre-mold insulator, and causing the protection member to follow the pre-mold insulator, The passing portion on the peripheral surface of the cable insulator through which the remold insulator has passed is accommodated in the protection member, and after the premold insulator reaches a predetermined position, the engagement is released to allow the mounting. A method for protecting a cable insulator, wherein the jig is moved in a direction away from the pre-mold insulator, and the mounting jig is removed from the cable while the protection member remains on the peripheral surface of the cable insulator.

[0011]

According to the first aspect of the present invention, since the cylindrical protection member is provided to cover the passage on the peripheral surface of the cable insulator through which the pre-mold insulator has passed, the passage is exposed. Without protection.

According to the second aspect of the present invention, the pass-through portion on the peripheral surface of the cable insulator through which the pre-mold insulator has passed is accommodated in the protective member, so that the pre-mold insulator is formed of the cable insulator. While moving on the peripheral surface, it keeps protecting the passage.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. The following embodiments are preferred embodiments of the present invention, and the technical scope of the present invention is not limited to these embodiments.

FIG. 1 is an exploded perspective view of a cable insulator protection device according to an embodiment and a cable connection device provided with the same. FIG. 2A is a cross-sectional view showing a state where the pre-mold insulator 12 is mounted on the peripheral surface of the cable insulator 10b according to the embodiment, and FIG. 2B is a cross-sectional view of the cable insulator 10b according to the embodiment. FIG. 4C is a cross-sectional view showing a state in which the pre-mold insulator 12 has been moved, and FIG. 4C shows a jig (mounting jig) 14 for mounting the pre-mold insulator 12 according to the embodiment from the pre-mold insulator 12. It is sectional drawing which shows the state which removes. FIG. 3 is an exploded perspective view showing the mounting jig 14 and the protection pipe 16 according to the embodiment.

In this embodiment, as shown in FIGS. 1 and 2 (b), a pre-molded insulator 12 for relaxing electric field concentration is provided on a peripheral surface of a cable insulator 10b of a cable 10 which is covered with a cable conductor 10a. This is a cable insulator protection device in a cable connection device provided with a mounting jig 14 for moving the pre-mold insulator 12 on the peripheral surface of the cable insulator 10b in order to mount the pre-molded insulator at a predetermined position. This cable insulator protection device includes a protection pipe 16 that covers a passage portion B on the peripheral surface of the cable insulator 10b through which the pre-mold insulator 12 has passed, and the protection pipe 16 is attached by the mounting jig 14. It is movable.

The cable 10 is obtained by covering the cable insulator 10b with a semiconductive layer or a shielding layer indicated by reference numeral 10c. Prior to the connection of the cable 10, the semiconductive layer and the shielding layer indicated by the reference numeral 10c at the end of the cable 10 are peeled off as in the prior art. Further, the cable connection device includes a cylindrical jig 18 for detaching the mounting jig 14.

The pre-mold insulator 12 has a through hole 12a through which the cable insulator 10b is inserted. The first conical surface 12 is formed on the outer surface of the pre-mold insulator 12.
b1 and a second conical surface 12b2 are formed, and a cylindrical outer peripheral surface 12b3 is formed between the first conical surface 12b1 and the second conical surface 12b2.

The mounting jig 14 has a substantially cylindrical shape as shown in FIG. The main body 1 is located at one end in the axial direction.
4a1 and a flange 14a2 which is pressed by the cylindrical jig 18 and protrudes in the axial radial direction from one axial end of the main body 14a1 are formed. Is formed on the other end of the pre-molded insulator 12c.
And two fan-shaped engaging portions 14b, 14b which are in contact with one end of the protective pipe 16 and engage with the opening of the protective pipe 16 are formed.

The protection pipe 16 has a cylindrical shape as shown in FIG. 3, and the inner diameter of the inner peripheral surface 16a is larger than the outer diameter of the cable insulator 10b. Further, at the cable insertion side opening of the protection pipe 16, a fan-shaped shape corresponding to the locking portions 14b, 14b of the mounting jig 14 and locking pieces 16b, 16b to be engaged therewith are formed. ing. Note that the protection pipe 16 is not limited to this shape, and may be a tubular member having a square outer surface.

The cylindrical jig 18 is made of the pre-molded insulator 1
It has a cylindrical shape with an inner peripheral surface 18a that forms a space through which it can pass.

In the cable connection method using the cable connection device having the above-described configuration, as shown in FIGS. 2A, 2B and 2C, the cable conductor 10a of the cable 10 is covered. On the peripheral surface of the cable insulator 10b,
A first step of preparing to mount the pre-mold insulator 12 for reducing electric field concentration, and using the jig 14 for mounting the pre-mold insulator 12 to place the pre-mold insulator 12 on the peripheral surface of the cable insulator 10b. And a second step of moving to a position. The method for protecting a cable insulator in this cable connection method is as follows.
Is installed near the end 10b1 of the cable insulator 10b so as to be coaxial with the cable 10, and the protective pipe 16 is engaged with the mounting jig 14 to perform the second step. Then, using the mounting jig 14,
The pre-mold insulator 12 is moved, and the protection pipe 16 is made to follow the pre-mold insulator 12, and the passing portion B on the peripheral surface of the cable insulator 12 through which the pre-mold insulator 12 has passed passes through the protection pipe 16. To be accommodated.

The first step and the second step will be further described. In the first step, as shown in FIG. 2A, the through-hole 12a of the pre-mold insulator 12 is mounted on the peripheral surface of the end 10b1 of the cable insulator 10b. Next, the cable 10 and the pre-molded insulator 12 are inserted through the inner peripheral surface 18a of the cylindrical jig 18 so that the mounting jig 1
The mounting jig 14 is set so that the inner surface of the conical portion 14c of the fourth and the first conical surface 12b1 of the pre-mold insulator 12 are in contact with each other. Then, the protection pipe 16 is installed so as to be coaxial with the cable 10, that is, so as to be in series with the cable 10.
b, 16b are engaged with the locking portions 14b, 14b of the mounting jig 14.

Next, in the second step, as shown in FIG. 2B, the mounting jig 14 is moved in the axial direction of the cable 10 so that the pre-mold insulator 12 is moved to the peripheral surface of the cable insulator 10b. Is moved to a predetermined position. At this time, the protection pipe 16 engaged with the mounting jig 14 is connected to the cable insulator 10b through which the pre-mold insulator 12 has passed.
Is accommodated in the inner peripheral surface 16a. Then, when the pre-mold insulator 12 reaches a predetermined position on the peripheral surface of the cable insulator 10b, as shown in FIG. 2 (c), the locking pieces 16b, 16b of the protection pipe 16 and the mounting jig 14 is released from engagement with the locking portions 14b, 14b, and one end of the cylindrical jig 18 is pressed against the flange 14a2 of the mounting jig 14, thereby protecting the mounting jig 14 in the cable axial direction. Move to the pipe 16 side, and
The mounting jig 14 and the cylindrical jig 18 are removed from the cable 10 while leaving only the peripheral surface of the cable insulator 10b.

As shown in FIG. 3, the engagement between the mounting jig 14 and the protective pipe 16 is performed by the locking portion 1 of the mounting jig 14.
4b, 14b, the locking pieces 16b, 1 of the protection pipe 16 are attached.
6b is fastened using a screw member or the like.
In this fastening, the screw member is connected to the locking portions 14b, 14b,
And the through holes 14b1, 14b1, 14b1, 14b1, and 16 provided in the locking pieces 16b, 16b, respectively.
b1, 16b1, 16b1, and 16b1. In order to release the engagement between the mounting jig 14 and the protective pipe 16, the screw member is engaged with the engaging portions 14b, 1b.
After the protective pipe 16 is disengaged from the locking pieces 4b and the locking pieces 16b, 16b, the protection pipe 16 is rotated by 90 degrees about the cylindrical axis as shown by the two-dot chain line in FIG. Thereby, the locking portion 14
The b and 14b and the locking pieces 16b and 16b do not interfere with each other when moving in the axial direction. In this case, instead of rotating the protection pipe 16, the mounting jig 14 may be rotated 90 degrees about the cylindrical axis.

Therefore, according to this embodiment, while the pre-mold insulator 12 moves on the peripheral surface of the cable insulator 10b, the passing portion on the peripheral surface of the cable insulator 10b through which the pre-mold insulator 12 has passed. Keep protecting B.

Therefore, during the operation, the vicinity of the end portion 10b1, which is a particularly important point in the electrical performance, of the cable insulator 10b is not damaged or stained until the connection of the cable conductor 10a.

The present invention is suitable for use in a prefabricated connection box such as an intermediate connection portion of a cable as in the above-described embodiment. The present invention can be applied to a connection box and a terminal box in which protection of the surface of the cable insulator is desired at the same time as mounting the body. The engagement or disengagement between the mounting jig 14 and the protection pipe 16 is performed by using the locking portions 14b, 14b of a chuck type or the like, and using the claws of the chuck to hold the protection pipe 1.
The retaining pieces 16b, 16b of FIG. 6 may be gripped or released.

[0028]

According to the present invention, it is possible to reliably prevent external damage or foreign matter from adhering to the peripheral surface of the cable insulator during the operation until the cable conductor is connected.
Also, there is no need to wind a protective tape or the like to protect the cable insulator, so that the cable can be connected efficiently.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a cable insulator protection device according to the present embodiment and a cable connection device provided with the same.

FIG. 2A is a cross-sectional view showing a state where a pre-molded insulator is mounted on a peripheral surface of a cable insulator according to the present embodiment. (B) is a sectional view showing a state in which the pre-molded insulator has been moved on the peripheral surface of the cable insulator according to the present embodiment. (C) is a sectional view showing a state in which the mounting jig according to the present embodiment is removed from the premold insulator.

FIG. 3 is an exploded perspective view of the mounting jig and the protection pipe according to the embodiment.

FIG. 4A is a cross-sectional view illustrating a state in which a pre-mold insulator is moved on a peripheral surface of a cable insulator according to a conventional cable connection device. (B) is a sectional view showing a state in which an epoxy unit is mounted on a cable according to a conventional cable connection device. (C) is sectional drawing which shows the state which connected the cable conductor which concerns on the conventional cable connection apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cable 10a Cable conductor 10b Cable insulator 12 Pre-mold insulator 14 Pre-mold insulator mounting jig 16 Protective pipe B Passing part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02G 1/14 H01R 43/00 H02G 15/08

Claims (2)

(57) [Claims] 1. A pre-molded insulator for reducing electric field concentration is mounted at a predetermined position on a peripheral surface of a cable insulator covered with a conductor in a cable. An apparatus for protecting a cable insulator in a cable connection device provided with a pre-mold insulator mounting jig to be moved on a surface, wherein the pre-mold insulator passes over a peripheral surface of the cable insulator. A protection member for covering the passage portion, wherein the protection member and the mounting jig are engaged with each other to protect the protection member ;
An engagement portion for allowing the member to move together with the mounting jig;
Then, this engaging part presses the pre-mold insulator with the mounting jig.
When moving to a predetermined position
Engage the mounting jig mounting and the pre-molded insulator
After reaching the predetermined position, the engagement is released and the protection member is removed.
Hold the mounting jig while leaving it on the circumference of the cable insulator.
Cable insulation protection device according to claim der Rukoto which can be removed from Buru. 2. A first step of preparing for mounting a pre-mold insulator for reducing electric field concentration on a peripheral surface of a cable insulator covered with a conductor in a cable, and a pre-mold insulator mounting jig. Moving the pre-molded insulator to a predetermined position on the peripheral surface of the cable insulator using a second step,
A method of protecting a cable insulator, wherein in the first step, a tubular protection member through which the cable can be inserted is installed near an end of the cable insulator so as to be coaxial with the cable. And engaging the protection member with the mounting jig. In a second step, using the mounting jig, moving the pre-mold insulator, and attaching the protection member to the pre-mold insulator. is additionally row, the pre-molded insulator to the passage portion of the peripheral surface of the cable insulation which has passed, is housed in the protective member, the engagement is after premolded insulator reaches a predetermined position
And release the mounting jig from the pre-molded insulator.
Is moved in a direction, the protective member cable insulation body circumference away
A method for protecting a cable insulator, comprising removing a mounting jig from a cable while leaving it on a surface .