JPH0767226A - Protector and protective method for cable insulator - Google Patents

Abstract

PURPOSE:To protect the peripheral surface of a cable insulator positively against damage or adhesion of foreign matter during connection work of cable conductor. CONSTITUTION:The protector for cable insulator is employed in a cable connecting apparatus equipped with a jig 14 which moves a premold insulator 12 for relaxing concentration of field on the peripheral surface of a cable insulator 10b applied to the cable conductor 10a of a cable 10 and fitting the premold insulator 12 at a predetermined position. The protector is provided with a protective pipe 16 covering the part B on the peripheral surface of the cable insulator 10b where the premold insulator 12 passed and the protective pipe 16 is movable by means of the mounting jig 14.

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 insulating body protecting device and a cable insulating body protecting method for protecting a peripheral surface of a cable insulating body when connecting a cable conductor.

[0002]

2. Description of the Related Art Generally, when a line for transmitting or distributing electric power is long, the cable constituting the line is limited in length due to manufacturing, transportation, and installation reasons. It is not possible to use a (continuous one), and it is necessary to provide a connecting portion (also called a connection box) using a plurality of cables. As one of the connecting portions, a premolded insulator of a cable connecting part for relaxing electric field concentration and an epoxy unit for accommodating the premolded insulator are preformed and provided, and these cover the conductor connecting end portion. There is a prefabricated type that is arranged like this. Conventionally, a cable connecting device used for assembling this prefabricated type connecting portion and a cable connecting method by the device are as shown in FIGS. 4 (a), 4 (b) and 4 (c). In addition, FIG.
The cables a shown in (b) and (c) are formed by coating the cable insulator a2 covered by the cable conductor a1 with a semiconductive layer or a shielding layer indicated by reference numeral a3. Further, prior to the connection of the cable a, the semiconductive layer, the shielding layer and the like indicated by the reference numeral a3 at the end of the cable a are peeled off.

First, as shown in FIG. 4 (a), a premold insulator b is attached to the cable insulator a2 at the end of the cable a. After that, the premolded insulator b is moved by an appropriate distance (distance A) from the end portion of the cable insulator a2 to the central portion using the mounting jig c, and then the mounting jig c is mounted. Remove tool c.

Next, as shown in FIG. 4 (b), a protective tape d is wound around the exposed portion (the portion corresponding to the distance A) of the peripheral surface of the cable insulator a2 to insulate the cable during connection work. The body a2 is protected from external damage and foreign matter. Then, the end of the cable a and the premolded insulator b
Are housed in the hollow holes of the epoxy unit e. That is, the epoxy unit e has a substantially cylindrical shape, has a through hole e1 along the central axis thereof, and communicates with the through hole e1 at both ends thereof and accommodates the pre-molded insulator b. , Space portions e2, e2 having a shape corresponding to the outer shape of the insulator b. In addition, when accommodating in the epoxy unit e, the cable insulator a2 is inserted into the through hole e1 of the epoxy unit e, and the premolded insulator b is fitted in the accommodating portion e2 of the epoxy unit e.

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 1 and 1 by so-called compression connection, the epoxy unit e and the premolded insulator b were returned in the direction of the sleeve g.

[0006]

However, the conventional cable connecting device and method for assembling the prefabricated type connecting portion have the following problems. That is, in order to move the premolded insulator b from the end of the cable insulator a2 by the distance A, remove the mounting jig c, and wind the protective tape d around the exposed portion of the peripheral surface of the cable insulator a2. , Premolded insulator b
The exposed portion remains exposed until after the protective tape d has been wound after the moving and passing over the cable insulator a2.

Therefore, during the work, there is a possibility that external damage may occur or foreign matter may adhere to the exposed portion of the cable insulator a2, which is a particularly important portion for electrical performance. It is also possible to shorten the time during which the exposed portion of the cable insulator a2 is exposed by improving the work setup and the like, but the exposure time cannot be eliminated at all. Further, the work of winding the protective tape d on the exposed portion and the work of peeling off the tape d after it is no longer required are troublesome.

The present invention has been made to solve the problems of the prior art, and its purpose is to prevent external damage or foreign matter from being generated on the peripheral surface of the cable insulator during the work until the cable conductor is connected. It is an object of the present invention to provide a cable insulator protection device and a cable insulator protection method for surely protecting from being attached.

[0009]

The present invention has the following constitution in order to achieve the above object. That is, according to the invention of claim 1, since the pre-molded insulator for relaxing the electric field concentration is mounted at a predetermined position on the peripheral surface of the cable insulator covered with the conductor of the cable, the pre-molded insulator is used for the cable insulation. In a cable connection device equipped with a pre-molded insulator mounting jig that moves on the peripheral surface of the body,
A device for protecting a cable insulator, comprising a tubular protective member for covering a passage portion on a peripheral surface of the cable insulator through which the premolded insulator has passed, the protective member being the mounting jig. It is a cable insulation protection device characterized by being movable.

The invention of claim 2 further comprises a first step of preparing for mounting a premold insulator for relaxing electric field concentration on the peripheral surface of the cable insulator covered with the conductor of the cable, and the premold. A second step of moving the premolded insulator to a predetermined position on the peripheral surface of the cable insulator using an insulator mounting jig, the method of protecting the cable insulator in a cable connecting method In the first step, a tubular protective member through which the cable can be inserted is installed near the end of the cable insulator so as to be coaxial with the cable, and the mounting jig is also provided. The protective member is engaged with the protective member, and in the second step, the mounting jig is used to move the pre-molded insulator and the protective member is driven along the pre-molded insulator. The passage section of the peripheral surface of the cable insulation the premolded insulator has passed a cable insulation protection method for causing housed in the protective member.

[0011]

According to the invention of claim 1, since the cylindrical protective member is provided to cover the passage portion on the peripheral surface of the cable insulator through which the premolded insulator has passed, the passage portion is exposed. Can be protected without.

Further, according to the second aspect of the present invention, the passage portion on the peripheral surface of the cable insulator through which the premold insulator passes is accommodated in the protective member, so that the premold insulator is the cable insulator. Continue to protect the passage while moving over the circumference.

[0013]

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

FIG. 1 is an exploded perspective view of a cable insulator protecting device and a cable connecting device provided with the same according to an embodiment. 2A is a cross-sectional view showing a state in which the premolded insulator 12 is mounted on the peripheral surface of the cable insulator 10b according to the embodiment, and FIG. 2B is the peripheral surface of the cable insulator 10b according to the embodiment. A cross-sectional view showing a state in which the premold insulator 12 is moved above. FIG. 6C shows a jig (mounting jig) 14 for mounting the premold insulator 12 according to the embodiment from the premold 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 premolded insulator 12 for relaxing electric field concentration on the peripheral surface of the cable insulator 10b covered with the cable conductor 10a in the cable 10. Is a cable insulator protection device in a cable connection device, which is equipped with a mounting jig 14 for moving the premolded insulator 12 on the peripheral surface of the cable insulator 10b in order to mount it on a predetermined position. This cable insulator protection device includes a protective pipe 16 that covers a passage portion B on the peripheral surface of the cable insulator 10b through which the premolded insulator 12 has passed, and the protective pipe 16 is the mounting jig 14. It can be moved.

The cable 10 is formed by coating the cable insulator 10b with a semiconductive layer, a shielding layer, and the like indicated by reference numeral 10c. Further, prior to the connection of the cable 10, the semiconductive layer, the shielding layer and the like indicated by the reference numeral 10c at the end of the cable 10 are peeled off as in the conventional case. Further, the cable connecting device includes a cylindrical jig 18 for removing the mounting jig 14.

The premolded insulator 12 has a through hole 12a through which the cable insulator 10b is inserted. In addition, the first conical surface 12 is formed on the outer surface of the premolded 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 provided at one end in the axial direction.
4a1 and a flange portion 14a2 that is pressed by the cylindrical jig 18 and projects in the axial radial direction from one axial end of the main body portion 14a1. The main body portion 14a1 is formed at the other end in the axial direction. A conical portion 14c which is connected to the other side and tapers to the other side, and the premolded insulator 12 is formed at the end of the conical portion 14c.
Is formed with two fan-shaped locking portions 14b, 14b that abut one end of the protection pipe 16 and engage the opening of the protection pipe 16.

As shown in FIG. 3, the protective pipe 16 has a cylindrical shape, and the inner peripheral surface 16a thereof has an inner diameter larger than the outer diameter of the cable insulator 10b. Further, the cable insertion side opening of the protective pipe 16 is provided with locking pieces 16b, 16b having a fan shape corresponding to the locking portions 14b, 14b of the mounting jig 14 and engaged therewith. ing. The protective pipe 16 is not limited to this shape, and may be a tubular member having an outer surface angular shape.

The cylindrical jig 18 is a premolded insulator 1.
It has a cylindrical shape with an inner peripheral surface 18a forming a space through which 2 can pass.

In the cable connecting method using the cable connecting device having the above-described structure, as shown in FIGS. 2 (a), 2 (b) and 2 (c), the cable conductor 10a of the cable 10 is covered. On the peripheral surface of the cable insulator 10b,
The first step of preparing to mount the premold insulator 12 for relaxing the electric field concentration, and the premold insulator 12 is predetermined on the peripheral surface of the cable insulator 10b using the premold insulator mounting jig 14. And a second step of moving it to the position. The cable insulation protecting method in this cable connecting method is the same as the cable 10 in the first step.
Is installed in the vicinity of the end 10b1 of the cable insulator 10b so as to be coaxial with the cable 10, and the protection pipe 16 is engaged with the mounting jig 14 to carry out the second step. Then, using the mounting jig 14,
While moving the premold insulator 12, the protection pipe 16 is made to follow the premold insulator 12, and the passage portion B on the peripheral surface of the cable insulator 12 through which the premold insulator 12 has passed is placed inside the protection pipe 16. To house.

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 premolded insulator 12 is attached to the peripheral surface of the end 10b1 of the cable insulator 10b. Next, the cable 10 and the premolded insulator 12 are inserted into the inner peripheral surface 18a of the cylindrical jig 18, and the mounting jig 1
The mounting jig 14 is installed so that the inner surface of the conical portion 14c of No. 4 and the first conical surface 12b1 of the premolded insulator 12 are in contact with each other. The protection pipe 16 is installed coaxially with the cable 10, that is, in series with the cable 10, and the locking piece 16 of the protection pipe 16 is installed.
b and 16b are engaged with the locking portions 14b and 14b of the mounting jig 14.

Next, in the second step, as shown in FIG. 2 (b), the mounting jig 14 is moved in the axial direction of the cable 10 to move the premolded insulator 12 to the peripheral surface of the cable insulator 10b. Move it to the specified position above. At this time, the protection pipe 16 engaged with the mounting jig 14 has the cable insulator 10b through which the premolded insulator 12 has passed.
The passing portion B on the peripheral surface of is accommodated in the inner peripheral surface 16a. Then, when the premolded insulator 12 reaches a predetermined position on the circumferential surface of the cable insulator 10b, as shown in FIG. 2C, the locking pieces 16b, 16b of the protection pipe 16 and the mounting jig are attached. 14 is released from the engagement with the locking portions 14b and 14b, and one end of the cylindrical jig 18 is pressed against the flange portion 14a2 of the mounting jig 14 to protect the mounting jig 14 in the cable axial direction. Move to the pipe 16 side,
Only the mounting jig 14 and the cylindrical jig 18 are removed from the cable 10 while leaving only the cable insulator 10b on the peripheral surface.

As shown in FIG. 3, the fitting jig 14 and the protective pipe 16 are engaged with each other by engaging the engaging portion 1 of the fitting jig 14 with each other.
The locking pieces 16b, 1 of the protective pipe 16 are provided on the 4b, 14b.
6b is fastened by using a screw member or the like.
In this fastening, the screw member is attached to the locking portions 14b, 14b,
And through holes 14b1, 14b1, 14b1, 14b1 and 16 provided in the locking pieces 16b, 16b, respectively.
It is performed by inserting it into b1, 16b1, 16b1, 16b1. When releasing the engagement between the mounting jig 14 and the protective pipe 16, the screw member is engaged with the engaging portions 14b, 1b.
4b and the locking pieces 16b, 16b, the protective pipe 16 is rotated 90 degrees about the cylindrical axis as shown by the chain double-dashed 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 premolded insulator 12 moves on the peripheral surface of the cable insulator 10b, the passage portion on the peripheral surface of the cable insulator 10b through which the premolded insulator 12 passes. Continue to protect B.

Therefore, before the connection of the cable conductor 10a, the vicinity of the end 10b1 which is a particularly important portion in the electric performance of the cable insulator 10b is not damaged or soiled during the work.

The present invention is suitable for use in a prefabricated junction box such as an intermediate connecting portion of a cable as in the above-described embodiment, and also, regardless of whether the premold insulator is returned or not, premold insulation is performed. It can also be applied to connection boxes and termination boxes where it is desired to protect the surface of the cable insulator at the same time as mounting on the body. Further, in order to engage or disengage the mounting jig 14 and the protective pipe 16, the locking portions 14b, 14b are made into a chuck type or the like, and the protective pipe 1 is secured by the claws of the chuck.
The locking pieces 16b, 16b of 6 may be grasped or released.

[0028]

According to the present invention, it is possible to surely prevent external damage or foreign matter from being attached to the peripheral surface of the cable insulator during the work until the cable conductor is connected.
Further, it is not necessary to wrap a protective tape or the like to protect the cable insulator, and the cable can be efficiently connected.

[Brief description of 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 in which a premolded insulator is attached to the peripheral surface of the cable insulator according to the present embodiment. (B) is a sectional view showing a state in which the premolded insulator is moved on the peripheral surface of the cable insulator according to the present embodiment. FIG. 7C is a sectional view showing a state in which the mounting jig according to the present embodiment is removed from the premolded insulator.

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

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

[Explanation of symbols]

 10 Cable 10a Cable Conductor 10b Cable Insulator 12 Premold Insulator 14 Premold Insulator Mounting Jig 16 Protective Pipe B Passage

Claims (2)

[Claims] 1. A premolded insulator for relaxing electric field concentration is attached at a predetermined position on a peripheral surface of the cable insulator covered with a conductor of a cable, so that the premolded insulator is surrounded by the circumference of the cable insulator. A device for protecting a cable insulator in a cable connecting device provided with a jig for mounting a premolded insulator that moves on a surface, the device being provided on a peripheral surface of the cable insulator that the premolded insulator has passed through. A cable insulator protection device comprising a tubular protection member that covers the passage portion, the protection member being movable by the mounting jig. 2. A first step of preparing for mounting a premold insulator for relaxing electric field concentration on a peripheral surface of a cable insulator covered with a conductor of a cable, and a premold insulator mounting jig. A second step of moving the premolded insulator to a predetermined position on the peripheral surface of the cable insulator by using the premolded insulator.
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. At the same time, the protection member is engaged with the mounting jig, and in the second step, the premold insulator is moved using the mounting jig, and the protection member is attached to the premold insulation. A method for protecting a cable insulator, characterized in that the body is made to follow and a passage portion on the peripheral surface of the cable insulator, through which the premolded insulator has passed, is accommodated in the protective member.