JP2002135961A - Pressing device for premolded insulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a structure which allowed easy assembly of a pressing device 17a to a cable connection part. SOLUTION: A plurality of locking protrusions 47 are provided on the outer peripheral the end surface at the tip of a connecting cylinder 44 constituting the pressing device 17a. At a part of an end plate 9a fixed to the end of a joint cylinder 3, recessed grooves for locking 50, 50 which lock freely with the locking protrusions 47 are provided. By locking each of the protrusions 47 with each of the grooves 50, 50, the pressing device 17a is coupled with the end plates 9a. After these are coupled, by relaxing the tightening of the nuts 46, 46 thread to the tips of the guide rods 42, 42, a pressing sleeve 19 is advanced and the premolded insulator 18 is pressed by the pressing sleeve 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A pre-molded insulator pressing apparatus according to the present invention includes a prefabricated type connecting part for connecting the ends of a power cable such as a CV cable used as an underground power transmission line. The present invention relates to an improvement in a device for pressing a mold insulator. Further, the present invention can be used for pressing a pre-molded insulator to be incorporated into a terminal connection portion of a cable.

[0002]

2. Description of the Related Art Conventionally, an end of a transmission cable such as a CV cable constituting an underground transmission line is connected to each other, or an end of the transmission cable is connected to a power device such as a transformer or a switchgear. Therefore, a cable connection portion as shown in FIGS. 8 to 12 is used. The end of the cable conductor 2 that forms the cable 1 is electrically connected to the end of the cable conductor that forms another cable or the end of the internal wiring that forms the power device via the connection tube 3. . In the case of the illustrated example, the connection tube 3 is formed by covering the periphery of the embedding fitting 5 with an insulating tube 4 made of an insulating material such as an epoxy resin.

The embedded metal fitting 5 is made of a metal having good conductivity such as copper, and has one end (the right end in FIGS. 8 to 11) formed in a bottomed cylindrical shape. A cylindrical projection 6 is formed on the inner surface of the bottomed cylindrical portion. The base end (the left end in FIGS. 8 to 11) of the cylindrical connector 7 is externally fitted and fixed to the projection 6. The connector 7 has a plurality of conductive elements arranged in a cylindrical shape and both ends thereof are bound by a spring.
The inner diameter of the distal end portion (right end side in FIGS. 8 to 11) is smaller than the outer diameter of the distal end portion of the connection terminal 14, which will be described later, in a free state. It is elastically expandable.

An insertion hole 8 is formed at one end (right end in FIGS. 8 to 11) of the insulating cylinder 2 at a position aligned with one end opening of the embedding metal fitting 5 at one end surface of the insulating cylinder 2. It is provided in an open state. The inner peripheral surface of the inner half of the insertion hole 8 (the left half of FIGS. 8 to 11) has a first inner diameter side which is inclined in such a direction that the inner diameter increases toward the opening side (the right side of FIGS. 8 to 11). The tapered surface 32 is used. Further, an end plate 9 is provided on one end surface of the insulating cylinder 2 around the insertion hole 8 and a plurality of screws 10.
It is supported and fixed by. Further, between one end face of the insulating cylinder 2 and the inner end face of the end plate 9 (the left end face in FIGS. 8 to 11),
O locked in a locking groove 11 formed in the inner end face of the end plate 9
Sealed by a ring 12. In a case where a case for housing the insulating tube 2 is provided around the insulating tube 2, the end plate 9 may be supported and fixed to an end of the case.

When the end of the cable 1 is connected to the connecting tube 3 having the above-described structure, first, as shown in FIG. 8, the end of the cable conductor 2 forming the cable 1 is insulated. A connection terminal 14 is connected and fixed to a portion exposed from the layer 13. That is, with the end of the cable conductor 2 inserted into the coupling hole 15 opened in the base end surface of the connection terminal 14, the base end of the connection terminal 14 is crushed inward in the diameter direction, and the connection hole 15 is crushed. And the outer peripheral surface of the end portion of the cable conductor 2 are brought into close contact with each other. At the same time, the cable 1
Around the back of the cable 1 (right side in FIGS. 8 to 11)
The protective cover 16, the pressing device 17, and the pre-mold insulator 18 are arranged in this order.

Next, as shown in FIG. 9, the end of the cable 1 is inserted into an insertion hole 8 provided at one end of the insulating tube 2. Then, the distal end of the connection terminal 14 connected to the end of the cable conductor 2 is inserted inside the distal end portion of the connector 7, and the outer peripheral surface of the distal end of the connection terminal 14 and the inside of the connector 7 are inserted. Make close contact with the peripheral surface. In this state, the cable conductor 2 and the embedded metal fitting 5 are connected to the connection terminal 14.
And through the connector 7. The end of a cable conductor constituting another cable or an end of an internal wiring constituting a power device is electrically connected to the embedded metal member 5 via another conductor or the like. As a result, the cable conductor 2 is electrically connected to the cable conductor constituting the other cable or the internal wiring. Further, the pre-molded insulator 18 is pushed into a cylindrical space between the inner peripheral surface of the insertion hole 8 and the outer peripheral surface of the end of the insulating layer 13 constituting the cable 1, and this cylindrical space is Close up.

The pre-molded insulator 18 is formed by combining an insulating part made of EP rubber and a semiconductive part made of EP rubber to which carbon is added, and has a shape like an abacus ball elongated in the axial direction. . The first inner diameter side tapered surface 3 provided in the inner half of the insertion hole 8 is provided on one half of the outer peripheral surface (the left half of FIGS.
A first outer diameter side tapered surface 33 which can freely contact with the second outer diameter 2 is formed. Then, by pushing the pre-mold insulator 18 into the cylindrical space as described above, the first outer diameter side tapered surface 33 and the first inner diameter side tapered surface 32 are brought into contact with each other, and The inner peripheral surface of the pre-molded insulator 18 and the outer peripheral surface of the end portion of the insulating layer 13 are in contact with each other. On the other half of the outer peripheral surface of the pre-mold insulator 18 (the right half of FIGS. 8 to 11), a second outer diameter side tapered surface inclined in a direction in which the outer diameter decreases toward the other end. 34 are formed.

After the pre-mold insulator 18 has been pushed into the cylindrical space as described above, the pressing device 17 is connected to the end plate 9 as shown in FIG. For this purpose, the tip portions (left end portions in FIGS. 8 to 11) of the plurality of studs 36 constituting the pressing device 17 are screw holes 37 formed at a plurality of circumferential positions of the end plate 9 respectively.
And tighten it further. These multiple studs 3
6 and 36 (the right ends in FIGS. 8 to 11) are provided with through holes 39 formed in a portion near the outer periphery of the annular support plate 38, respectively.
39. Then, each of the studs 36, 3
The nut 40 screwed into the base end of the support plate 3
8 (right side in FIGS. 8 to 11).

The pre-molded insulator 18 is provided at a portion surrounded by the plurality of studs 36.
The pressing sleeve 19 for pressing is disposed. The inner peripheral surface of the pressing sleeve 19 is a second inner diameter side tapered surface 35 which can be in close contact with the second outer diameter side tapered surface 34 provided on the other half of the outer peripheral surface of the pre-mold insulator 18. . Also, the base end of such a pressing sleeve 19 (see FIGS.
The right ends of the guide rods 42 are connected to the base ends (left ends in FIGS. 8 to 11) of the guide rods 42 at a plurality of positions in the circumferential direction. 11 are inserted through guide holes 43 formed in a portion near the inner diameter of the support plate 38, respectively. The compression coil springs 20 are provided around the guide rods 42 so as to be sandwiched between the support plate 38 and the pressing sleeve 19.

After the pressing device 17 is connected to the end plate 9 as described above, the plurality of studs 36, 3
By increasing the amount of screwing of each of the nuts 40 into the base end portion 6, the pressing sleeve 19 is moved via the support plate 38 and the compression coil springs 20, 20 to the pre-mold insulator 18 side. In the axial direction.
Then, the second inner diameter side tapered surface 35 provided on the inner peripheral surface of the pressing sleeve 19 is brought into close contact with the second outer diameter side tapered surface 34 provided on the other half of the outer peripheral surface of the pre-mold insulator 18. Further, in this state, the distance between the pressing sleeve 19 and the support plate 38 (the length of each of the compression coil springs 20, 20) is reduced by increasing the screw-in amount of each of the nuts 40, 40. An elastic force is applied to each of the compression coil springs 20, 20. Thereby, the pre-mold insulator 1
8 is pressed in the axial direction based on the elasticity of each of the compression coil springs 20, 20, and is bitten into a deep portion in the cylindrical space. As a result, the inner and outer peripheral surfaces of the pre-mold insulator 18 and the outer peripheral surface of the end portion of the insulating layer 13 and the inner peripheral surface of the end portion of the insulating cylinder 4 are closely contacted without any gap. As a result, the insulation between the insulating layer 13 and the insulating cylinder 4 becomes
It will not be damaged based on the existence of the gap. In addition, the magnitude of the elasticity of each of the compression coil springs 20, 20 pressing the pre-mold insulator 18 depends on each of the nuts 40,
Adjust by changing the tightening force of 40. The lock nuts 41, 41 are used to prevent the nuts 40, 40 from rotating.

After the pressing device 17 has been assembled as described above, then, as shown in FIG.
6 is arranged around the pressing device 17. With this,
Both ends in the axial direction of the protective cover 16 are respectively connected and fixed to the end plate 9 and the protective layer 21 which is the outermost layer of the cable 1. The protective cover 16 is made of a conductive metal such as steel, a copper alloy, or an aluminum alloy, and has a cylindrical shape as a whole. The diameter of such a protective cover 16 depends on the proximal side (FIGS. 8 to 8) disposed around the pressing device 17.
11 is larger on the left end side (the left end side of FIG. 11) and smaller on the tip side (the right end side in FIGS. More specifically, the inner diameter of the protective cover 16 is slightly larger than the outer diameter of the pressing device 17 on the proximal end side, and the outer diameter of the protective layer 21 which is the outermost layer of the cable 1 on the distal end side. It is slightly larger than the size.

An outer flange 22 is provided at the base end of the protective cover 16. The flange 22 is fixed to the end plate 9 by a plurality of bolts 23. That is, the bolts 23 are inserted into through holes 24 formed at a plurality of positions in the circumferential direction of the flange portion 22.
With the bolts 23 inserted, these bolts 23 are screwed into screw holes 25 formed in the end plate 9 and tightened. Also, between the outer surface (the right side surface in FIGS. 8 to 11) of the end plate 9 and the end surface of the flange 22,
Are sealed by an O-ring 27 which is a sealing member, which is locked in a locking groove 26 formed in the end face of the seal. The distal end of the protective cover 16 is formed between the outer peripheral surface of the distal end and the protective layer 2.
The insulating tape 28 is wound and wound on the protective layer 21 so as to be wound between the protective layer 21 and the outer peripheral surface of the protective layer 21.
In this state, the space between the tip of the protective cover 16 and the protective layer 21 is sealed by the insulating tape 28 functioning as a sealing member. A grounding bracket 29 for connecting a ground wire is fixed to the outer peripheral surface of the protective cover 16 near the base end.

[0013]

In the case of the conventional structure as described above, the operation of connecting the pressing device 17 to the end plate 9 is troublesome. That is, in the case of the above-described conventional structure, when the pressing device 17 is coupled to the end plate 9, the tip portions of the plurality of studs 36, 36 are screw holes 37, 37 formed in the end plate 9, respectively. Need to be screwed and tightened.
For this reason, the work of connecting the pressing device 17 to the end plate 9 is troublesome because the screwing and tightening work needs to be performed a lot.

In the case of the above-described conventional structure, the elasticity of each of the compression coil springs 20 is equal to that of each of the studs 36,
The nuts are provided by tightening the nuts 40, 40, which are screwed to the base end of the nut 36 and hold down the support plate 38. However, the elasticity of each of the compression coil springs 20 required for pressing the pre-mold insulator 18 is extremely large. For this reason, a very large force is required to tighten the nuts 40, 40, and the efficiency of connection work performed in a narrow site such as a manhole is deteriorated.

In the case of the conventional structure as described above, the operation of connecting the base end of the protective cover 16 to the mating member (end plate 9) is troublesome. That is, in the case of the above-described conventional structure, when the base end of the protective cover 16 is coupled to the counterpart member (end plate 9), the flange 22 provided on the outer peripheral surface of the base end of the protective cover 16 is used. It is necessary to couple to the counterpart member (end plate 9) by a plurality of bolts 23,23. For this reason, since it is necessary to perform a lot of screwing and tightening work of these bolts 23, the work of connecting the base end of the protective cover 16 to the counterpart member (end plate 9) is troublesome.

In particular, as shown in FIG. 12, the cables 1, 1 to be installed in underground manholes, caves, etc., are placed in a state where these cables (one set of three phases) are adjacent to each other. It is often arranged near a wall 30, a floor 31, or the like. Therefore, the screwing and tightening work of the plurality of studs 36, 36 and the plurality of bolts 23, 23 as described above is performed by the pressing device 17 or the portion between the protective cover 16 and the wall 30 or the floor 31, And pressing devices 17, 17 adjacent to each other
It has to be performed in a narrow space existing between the protection covers 16 or between the protection covers 16, and is troublesome. The pre-mold insulator pressing device of the present invention has been made in view of the above-mentioned circumstances.

[0017]

According to the present invention, there is provided a pre-molded insulator pressing device, which is similar to the above-described conventional pre-molded insulator pressing device, in that the outer peripheral surface of an end portion of an insulating layer covering the periphery of a cable conductor is insulated. In order to close the cylindrical space between the inner peripheral surface of the cylinder and the inner peripheral surface, the inner peripheral surface is a cylindrical surface that can be in close contact with the outer peripheral surface of the insulating layer, and the outer peripheral surface can be in close contact with the inner peripheral surface of the end of the insulating cylinder. The pre-molded insulator having a conical convex surface is pressed toward the inner part of the cylindrical space by a plurality of compression springs via a pressing sleeve. In particular, in the pre-molded insulator pressing device of the present invention, an end plate supported and fixed to the opening end of the insulating cylinder or the case accommodating the insulating cylinder, and a cover provided on a part of the end plate. A coupling having an engaging portion and an engaging portion engaged with the engaged portion at one end thereof, coupled to the end plate based on the engagement between the engaged portion and the engaging portion; A cylinder and a support plate provided at the other end of the coupling cylinder are provided, and the plurality of compression springs are provided between the support plate and the pressing sleeve.

Further, in the case of the pre-molded insulator pressing device according to the fourth aspect, the distance between the support plate portion and the pressing sleeve is narrowed so that the plurality of compression springs in the pressing direction of the pressing sleeve are reduced. Holding means for keeping the distance between the support plate and the pressing sleeve in a state where the length of the pressing sleeve is elastically shorter than the length when the pre-mold insulator is pressed by the pressing sleeve. .

Further, in the case of the pre-molded insulator pressing device according to the fifth aspect, a protective cover is connected to the connecting tube or a part of the support plate, and the protective cover is connected to the protective cover. Of the connecting cylinder or the supporting plate portion based on engaging the second engaging portion provided on a portion of the connecting cylinder or the second engaged portion provided on a portion of the supporting plate portion. Partially bound.

[0020]

In the case of the pre-molded insulator pressing device of the present invention having the above-described structure, the operation of connecting the pressing device to the end plate can be easily performed. That is, in the case of the present invention, the above-described pressing device is formed by engaging an engaging portion provided at one end of the coupling cylinder constituting the pressing device with an engaged portion provided on a part of the end plate. Can be connected to the end plate. Therefore, in the case of the present invention, as in the conventional structure described above, it is said that the tips of the plurality of studs are screwed and tightened into the screw holes formed in the end plate.
There is no need for troublesome work. Therefore, even when a plurality of cables are arranged adjacent to each other, or when these cables are arranged close to a floor or a wall, an operation of connecting the pressing device to the end plate can be easily performed.

Further, in the case of the pre-mold insulator pressing device according to the fourth aspect, the holding means for holding the space between the support plate portion and the pressing sleeve in a state where the space is narrowed is provided. Therefore, the elasticity of the plurality of compression springs provided between the support plate and the pressing sleeve does not hinder the engagement between the engagement portion and the engaged portion. Further, after the engaging portion and the engaged portion have been engaged, if the holding means is removed and the distance between the supporting plate portion and the pressing sleeve is widened, the pre-mold insulator can be pressed by the pressing sleeve.

Further, in the case of the pre-mold insulator pressing device according to the fifth aspect, the work of connecting the protective cover to the pressing device can be easily performed. That is, in the case of the invention described in claim 5, the second engaging portion provided on a part of the protective cover is provided on the connecting cylinder or the supporting plate portion constituting the pressing device. The protective cover can be coupled to the pressing device by engaging with the engaged portion. Therefore, claim 5
In the case of the invention described in the above, like the conventional structure described above,
Part of protective cover (base end) and mating member (end plate 9)
There is no need to perform a troublesome operation, such as connecting a part of the cable with a plurality of bolts. Therefore, as in the case described above, even when a plurality of cables are arranged adjacent to each other, or when each of these cables is arranged close to the floor or a wall, the work of connecting the protective cover to the pressing device serving as the mating member is performed. Can be easily performed.

[0023]

1 to 7 show an embodiment of the present invention. The feature of the present invention is that the pressing device 1
7a, and the structure of a joint between a part of the pressing device 17a and the base end (the left end in FIGS. 1, 4, and 6) of the protective cover 16a. Since the structure and operation of the other parts are the same as those of the above-described conventional structure, the same parts are denoted by the same reference numerals, and overlapping description is omitted or simplified. explain.

In the case of the present embodiment, the pressing device 17a comprises a connecting cylinder 44 and an inward flange-like support plate 45 connected to the base end (the right end in FIGS. 1, 4 and 6) of the connecting cylinder 44. Is provided. Then, the pressing sleeves 19, which constitute the pressing device 17a, and their base ends are connected to the pressing sleeve 1a.
A plurality of guide rods 42, 42 connected to a plurality of locations in the circumferential direction of the base end portion 9 are disposed on the inner diameter side of the connecting cylinder 44, respectively. Then, the tip portions of the plurality of guide rods 42, 42 are respectively attached to the support plate portions 45.
Are inserted through guide holes 43 formed at a plurality of positions in the circumferential direction, and compression coil springs 20 are provided around the guide rods 42 between the support plate portion 45 and the pressing sleeve 19. It is provided in a state of being sandwiched between them. Further, the outer side surface of the support plate portion 45 (FIGS. 1, 4, 6,
7, the respective guide rods 42, 4 projecting from
Nuts 46, 46 are screwed into the tip of the second.

In the case of this example, as shown in FIG. 1, before the pressing device 17a is assembled to the cable connection portion, the interval between the pressing sleeve 19 and the support plate portion 45 is set to the same value after the assembly is completed. It is smaller than the state (the state shown in FIGS. 4 and 6 described later). For this reason, the outer surface of the support plate portion 45 is suppressed by the nuts 46, 46 screwed to the distal end portions of the guide rods 42, 42, and the elastic force of the compression coil springs 20, 20 is used to suppress the outer surface of the support plate portion 45. The gap is prevented from widening. In this state, the magnitude of the elasticity applied to each of the compression coil springs 20 is larger than the state after the completion of the assembly. As described above, the operation of rotating the nuts 46, 46 to narrow the gap can be easily performed by a suitable mechanical device in a wide place such as a factory. In the case of this example, as described later, in the process of assembling the pressing device 17a, the gap is widened by loosening the tightening of the nuts 46, 46, and the pre-mold insulator 18 is pressed by the pressing sleeve 19. Can be pressed freely. Therefore, in the case of this example,
With the nuts 46, 46 loosened as described above, the pre-molded insulator 18
(The elastic force of each of the compression coil springs 20, 20) is regulated to an appropriate value. In the case of this example, the guide rods 42, 42 and the nuts 46, 46 constitute a "holding means".

The distal end of the connecting cylinder 44 (FIGS. 1, 4, 6)
Plate-like engaging projections 47, 47 (engaging portions), each of which is long in the circumferential direction, are protrudingly provided at two positions on the outer peripheral surface of the shifted portion on the opposite side in the diametric direction. .
In addition, cuts 48, 48 are formed at the intermediate portions in the circumferential direction of these two engaging projections 47, 47, respectively. Further, in the case of the present example, the grounding fitting 29 is fixed to the outer peripheral surface of the intermediate portion of the connecting cylinder 44.

The outer end of the end plate 9a fixed to the axial end surface of the insulating tube 4 (the right end of FIGS. 1, 3A, 4, and 6).
The recesses 49, which are respectively long in the circumferential direction, are provided at portions (two positions on the opposite sides in the diametric direction) that can be aligned with the engaging projections 47, 47 in the circumferential direction.
49 (part of the engaged portion). These recesses 49, 49 are provided so as to open to the outer end surface and the inner peripheral surface of the end plate 9a, and the engagement protrusions 47, 47 are provided inside the respective end plates 9a. It can be inserted in the axial direction {right and left directions in FIGS. 1, 3A, 4, 5 and 6 and front and back directions in FIG. 3B}. Therefore, each of the recesses 4
The lengths of the engagement protrusions 47 in the circumferential direction are larger than the lengths of the engagement protrusions 47 in the circumferential direction.

In each of the end plates 9a, each of the recesses 4 is formed.
9 and 49, the axially innermost ends {FIG. 1, FIG. 3 (A), FIG.
The left and right ends ５ of the fifth and sixth portions are circumferentially adjacent to each other, and are each formed with a circumferentially long engaging concave groove 50, 50 (part of the first engaged portion). These engagement grooves 50, 5
Numeral 0 is provided in such a manner as to open on one end face in the circumferential direction of each of the recesses 49, 49 (clockwise front in FIG. 3B) and the inner circumferential face of the end plate 9a. In the case of this example, the width dimension of each of the engagement grooves 50, 50 is slightly larger than the thickness dimension of each of the engagement protrusions 47, 47, and the respective engagement grooves 50, 50 are also formed. Of the engaging projections 47, 47 in the circumferential direction is larger than the length of the engaging projections 47, 47 in the circumferential direction.

The inner peripheral surface of the end plate 9a is provided with the recess 4
Engagement grooves 51 are formed over the entire circumference in the portion in the axial direction deeper than the grooves 9 and 49 and the engagement grooves 50 and 50 (the left side in FIGS. 1, 3A, 4, 5 and 6). At the same time, the O-ring 52 is locked in the locking groove 51. Further, one of the two engagement concave grooves 50, 50 (FIG. 1, FIG. 1) is a part of the end plate 9a.
A screw hole 53 is formed in a portion matching with the intermediate portion of the engagement groove 50 (above 3, 4, and 6), and the inner peripheral surface of the one engagement groove 50 and the outer peripheral surface of the end plate 9a are aligned. It is formed in a diametric direction in a state where it is communicated. As will be described later, in a state where the above-mentioned (either one) engaging projection 47 is inserted all the way to the circumferentially deep portion of the above-mentioned one engaging concave groove 50, the screw hole 53 and the engaging hole 47 are engaged. The position where each part is formed is regulated so that the notch 48 formed in the middle part of the convex part 47 is aligned. In the case of the present example, the screw hole 53, the slit 48, and a screw 54 described later constitute an "engagement release preventing means".

The outer diameter of the proximal end of the connecting cylinder 44 is smaller than that of the other portion of the outer peripheral surface of the connecting cylinder 44, and the direction of the center axis is the pressing direction of the pressing sleeve 19 (FIG.
4, 6, 7).
Is formed. A male screw portion 56 which is a first screw portion is formed in a deep half portion (the left half portion in FIGS. 1, 4, 6, and 7) of the first cylindrical surface 55. On the other hand, this first cylindrical surface 5
A lock groove 57 is formed over the entire circumference near the tip of 5 (the right end of FIGS. 1, 4, 6, and 7), and an O-ring 58 is locked in the lock groove 57.

A second cylindrical surface 59 having a diameter larger than that of the other portion of the inner peripheral surface of the base half of the protective cover 16a is formed on the inner peripheral surface of the proximal end portion of the protective cover 16a. Then, the first half of the second cylindrical surface 59 (FIGS. 1, 4, 6, 7)
The left half of the female screw portion is formed with a female screw portion 60 which is a second screw portion which can be screwed with the male screw portion 56.

In the case of the present embodiment configured as described above, when connecting the pressing device 17a to the end plate 9a, first, as shown in FIG. The tip of 44 is opposed to the outer end face of the end plate 9a. Then, from this state, the pressing device 17a is moved in the axial direction (to the left in FIG. 1) toward the end plate 9a.
Each of the engaging projections 4 is connected to the distal end of the coupling cylinder 44.
The part protruding to the distal end side from the end plate 9a
O-ring 52 locked in a locking groove 51 formed in the inner peripheral surface of
Through the inner diameter side. At the same time, each of the engaging projections 4
7 and 47 are formed in the respective recesses 4 formed on the outer end face of the end plate 9a.
The engagement protrusions 47 are inserted into the insides of the recesses 49 and 49 against the inner end surfaces of the recesses 49 and 49 in the axial direction. In this state, the space between the end plate 9a and the protective cover 16a is sealed by the O-ring 52.

After the respective engaging projections 47, 47 are brought into contact with the inner end surfaces of the respective recesses 49, 49 as described above, the connecting cylinder 44 is then moved clockwise in FIGS. 2 and 3B. Turn｝. Thereby, each of the engaging projections 47, 47 is placed inside the engaging concave groove 50, 50 from the opening on one end face side in the circumferential direction of each of the recesses 49, 49 in the circumferential direction. Let me enter. Then, the circumferential edge of each of the engaging projections 47, 47 abuts against the inner circumferential end face of each of the engaging concave grooves 50, 50. As a result, each of the engaging projections 47, 47 and each of the engaging grooves 50, 50 are completely engaged,
The end plate 9a and the pressing device 17a including the connecting cylinder 44 are connected to each other.

As described above, each of the engaging projections 47,
In a state in which the circumferential edge of 47 is in contact with the rear edge of each of the engagement grooves 50, 50, the screw hole 53 formed in the end plate 9a and the engagement of the screw hole 53 on the side where the screw hole 53 is formed are formed. Recessed groove 50
The notch 48 formed at the intermediate portion of one of the engagement protrusions 47 that have entered the inside is aligned. Then, as shown in FIGS. 4 and 5, a screw 54 is screwed into the screw hole 53 from the outer diameter side opening of the screw hole 53. Then, the tip of the screw 54 protruding from the inner diameter side opening of the screw hole 53 is engaged with the slit 48. Thereby, the end plate 9a
And the protective cover 16a are prevented from rotating relative to each other,
Each of the engaging projections 47, 47 is engaged with each of the engaging concave grooves 50, 50.
To prevent accidental escape from

After the connecting cylinder 44 has been connected to the end plate 9a as described above, the tightening of the nuts 46, 46 screwed to the tips of the guide rods 42, 42 is then loosened, and these nuts 46 46 are moved from the position shown by the chain line in FIG. 4 to the position shown by the solid line. As a result, the distance between the pressing sleeve 19 holding the compression coil springs 20 and the support plate portion 45 is widened, and the pre-mold insulator 18 can be pressed by the pressing sleeve 19 freely. Further, as described above, in this state, the elasticity of each of the compression coil springs 20 has an appropriate value.

As described above, since the work of loosening the tightening of the nuts 46, 46 is performed while the compression coil springs 20, 20 are extended, the work can be performed with a light force. Then, as long as the nuts 46 are loosened, the elasticity of the compression coil springs 20 becomes an appropriate value. For this reason, in the case of this example, each of the compression coil springs 20 is different from the conventional structure in which the elasticity of each of the compression coil springs 20 changes according to the amount of tightening of the nuts 40, 40 (FIGS. 9 to 11). The work of setting the elasticity of 20, 20 to an appropriate value can be easily performed. In addition, as the member for preventing the interval between the pressing sleeve 19 and the support plate portion 45 from expanding, in addition to the nuts 46, 46,
Other members, such as a retaining ring and a retaining pin, which can be easily attached and detached (for example, with one touch) to and from the distal end portions of the guide rods 42, 42 can also be adopted. In this case,
At the tip of each of the guide rods 42, 42, a locking groove, a locking hole, and the like, which can lock a retaining ring, a retaining pin, and the like, are provided. In particular, when other members as described above are adopted, when it is difficult to secure a work space for loosening the tightening of the nuts 46, 46 as described above, for example, when the cable connection portion is installed in a narrow space. However, the operation of setting the elasticity of each compression coil spring to an appropriate value can be easily performed.

After the assembling operation of the pressing device 17a is completed as described above, the base end of the protective cover 16a is then connected to the connecting cylinder 44 of the pressing device 17a as shown in FIGS. At the base end, the tip is also cable 1
Respectively, to the outer peripheral surface of the protective layer 21 which is the outermost layer. In particular, in the case of this example, when connecting the base end of the protective cover 16a to the base end of the connecting tube 44, the female screw portion 60 formed on the inner peripheral surface of the base end of the protective cover 16a is used.
Is screwed into a male screw portion 56 formed on the outer peripheral surface of the base end portion of the connecting cylinder 44. In this state, the protective cover 16
The space between the inner peripheral surface of the proximal end portion a and the outer peripheral surface of the proximal end portion of the connecting cylinder 44 is sealed by an O-ring 58 locked in a locking groove 57 formed in the first cylindrical surface 55. In the case of this example, the protective cover 16a is provided with a gap between the outer peripheral surface of the intermediate portion of the insulating layer 13 constituting the cable 1 and the inner peripheral edge of the support plate portion 45, and the support plate portion 45. The inner peripheral edges of the formed guide holes 43, 43 and the respective guide rods 4
Foreign matter such as dust and muddy water is prevented from entering the cable connection portion from the gap between the outer peripheral surface of the front end portion of the cable and the muddy water.

In the case of the pre-molded insulator pressing device of the present embodiment configured as described above, the operation of connecting the pressing device 17a to the end plate 9a can be easily performed. That is, in the case of the present example, each of the engaging projections 47, 47 formed at the distal end of the coupling cylinder 44 constituting the pressing device 17a is replaced with each of the engaging concave grooves 50 formed at a part of the end plate 9a. , 50, the pressing device 17a can be connected to the end plate 9a.
That is, in the case of this example, it is necessary to perform a troublesome operation such as screwing / tightening the tip portions of the plurality of studs into the screw holes formed in the end plate 9a as in the above-described conventional structure. Absent. For this reason, even when a plurality of cable connecting portions are arranged adjacent to each other or each of these cable connecting portions is arranged close to a floor or a wall, an operation of connecting the pressing device 17a to the end plate 9a can be easily performed. I can do it. In the case of this example, each of the engaging projections 47, 47 and each of the engaging concave grooves 50,
In order to prevent inadvertent disengagement from the end plate 9a, a screw 54 is screwed into a screw hole 53 formed in a part of the end plate 9a. It can be provided in a state facing the large space side which is separated from the floor or the floor or between the cable connecting portions adjacent to each other. For this reason, the operation of screwing the screw 54 into the screw hole 53 can be easily performed using a large space.

In the case of this embodiment, the work of connecting the base end of the protective cover 16a to the pressing device 17a can be easily performed. That is, in the case of this example, the protective cover 16a
By engaging the female screw portion 60 formed on the inner peripheral surface of the base end portion with the male screw portion 56 formed on the outer peripheral surface of the base end portion of the coupling cylinder 44 constituting the pressing device 17a, the protective cover 16a is pressed. It can be coupled to the device 17a. That is, in the case of this example, it is necessary to perform a troublesome operation such as connecting the base end of the protective cover 16a and a part of the mating member with a plurality of bolts as in the above-described conventional structure. Absent. For this reason, similarly to the case described above, even when a plurality of cable connecting portions are arranged adjacent to each other, or when each of these cable connecting portions is arranged close to a floor or a wall, the protective cover 16a is connected to the pressing device 17a. It is easy to perform the work of combining with.

In the above-described example, the engaging projections 47,
In order to prevent the inadvertent disengagement of the engagement groove 47 from the engagement concave grooves 50, 50, the structure provided with the engagement release prevention means including the screw 54 and the like has been described. However, in the case of the present invention, for example, the engaging convex portions 47, 47 and the engaging concave grooves 50, 50 are frictionally engaged with each other, and these engaging convex portions 47, 47 and the engaging concave groove 50, If it is possible to prevent inadvertent disengagement with the 50, the above-described disengagement prevention means can be omitted.

[0041]

The pre-molded insulator pressing device of the present invention is constructed and operated as described above. Therefore, the work of assembling the pre-molded insulator pressing device and connecting the protective cover to the pre-molded insulator. And can easily be performed. For this reason, the cost required for installing the cable connection portion can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an embodiment of the present invention in a state before a pressing device is assembled.

FIG. 2 is an end view of a connecting cylinder and a support plate constituting the pressing device, as viewed from the right side of FIG. 1;

3A and 3B show an end plate, wherein FIG. 3A is a cross-sectional view, and FIG. 3B is a view as seen from the right side of FIG.

FIG. 4 is a sectional view showing a state after assembly of the pressing device is completed.

FIG. 5 is an enlarged view of a portion A in FIG. 4;

FIG. 6 is a sectional view showing a state after the protection cover is completely assembled.

FIG. 7 is an enlarged view of a portion B in FIG. 6;

FIG. 8 is a cross-sectional view showing a cable connecting portion including a conventional pre-molded insulator pressing device in a first stage of an assembling operation.

FIG. 9 is a sectional view shown in the second stage.

FIG. 10 is a sectional view shown in the third stage.

FIG. 11 is a sectional view showing a state after the completion of the assembly.

FIG. 12 is a view in which a part is omitted and viewed from the right side of FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cable 2 Cable conductor 3 Connection cylinder 4 Insulation cylinder 5 Embedded metal fitting 6 Convex part 7 Connector 8 Insertion hole 9, 9a End plate 10 Screw 11 Locking groove 12 O-ring 13 Insulating layer 14 Connection terminal 15 Coupling hole 16, 16a Protective cover 17, 17a Pressing device 18 Pre-mold insulator 19 Pressing sleeve 20 Compression coil spring 21 Protective layer 22 Flange 23 Bolt 24 Through hole 25 Screw hole 26 Locking groove 27 O-ring 28 Insulating tape 29 Grounding bracket 30 Wall 31 Floor 32 first inner diameter side taper surface 33 first outer diameter side taper surface 34 second outer diameter side taper surface 35 second inner diameter side taper surface 36 stud 37 screw hole 38 support plate 39 through hole 40 nut 41 lock nut 42 Guide rod 43 Guide hole 44 Connecting cylinder 45 Support plate 46 Nut 47 Engagement projection 48 Cut 49 recess Part 50 engaging concave groove 51 locking groove 52 O-ring 53 screw hole 54 screw 55 first cylindrical surface 56 male screw part 57 locking groove 58 O-ring 59 second cylindrical surface 60 female screw part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5G355 AA03 BA02 BA18 5G375 AA02 BA26 BB03 BB19 BB28 CA02 CA18 CB06 CB14 CB27 CB36 CB53 DB32 DB38 EA08

Claims (6)

[Claims] 1. An inner peripheral surface is closely contacted with an outer peripheral surface of the insulating layer so as to close a cylindrical space between an outer peripheral surface of an end portion of the insulating layer covering the periphery of the cable conductor and an inner peripheral surface of an end portion of the insulating tube. A pre-molded insulator having a freely cylindrical surface and an outer peripheral surface having a conical convex surface which can be in close contact with the inner peripheral surface of the end portion of the insulating cylinder is directed toward the inner side of the cylindrical space, and a plurality of compression springs are provided via a pressing sleeve. In the pre-mold insulator pressing device to press by
An end plate supported and fixed to the opening end of the insulating cylinder or the case housing the insulating cylinder; an engaged portion provided on a part of the end plate; and an engagement engaging with the engaged portion. A coupling tube having an end portion at one end thereof and coupled to the end plate based on the engagement between the engaged portion and the engagement portion; and a support plate provided at the other end of the coupling tube. Wherein the plurality of compression springs are provided between the support plate and the pressing sleeve. 2. The engaging portion is a plurality of engaging convex portions provided on an outer peripheral surface of one end of the connecting cylinder at intervals in a circumferential direction, and the engaged portion is one end of the connecting cylinder. A part of the outer surface of the end plate opposed to the end plate is provided in a portion where the phase in the circumferential direction is freely aligned with each of the engagement protrusions, with the end plate being open to the outer surface and the inner peripheral surface, respectively. A plurality of recesses inside each of which the engagement projections can be inserted from the axial direction of the end plate, and an opening in one end surface of each of the recesses in the circumferential direction and an inner peripheral surface of the end plate. And a plurality of engaging concave grooves which are insertable in the circumferential direction from an opening provided in the one end face, respectively, and are provided inside each of the engaging convex parts. 2. The pre-mold insulator pressing device according to 1. 3. In a state where each of the engaging projections and each of the engaging concave grooves are engaged with each other, the engagement between the respective engaging convex portions and the respective engaging concave grooves is prevented in order to prevent the engagement from being released. 3. The cable connection part according to claim 2, further comprising an engagement release prevention means for preventing the cylinder from rotating with respect to the end plate. 4. The length of the plurality of compression springs in the pressing direction of the pressing sleeve is reduced by reducing the distance between the support plate portion and the pressing sleeve, compared with the length when the pre-molded insulator is pressed by the pressing sleeve. The pre-mold insulator pressing device according to any one of claims 1 to 3, further comprising holding means for holding a gap between the support plate portion and the pressing sleeve in a state where the pressing sleeve is elastically shortened. 5. A protective cover is connected to a part of the connecting cylinder or the support plate, and the protective cover is connected to the connecting cylinder or the support plate by a second engaging portion provided on a part of the protective cover. The press according to any one of claims 1 to 4, wherein the press is connected to a part of the connecting tube or the support plate portion based on engaging with a second engaged portion provided on a portion of the portion. Mold insulator pressing device. 6. The second engaged portion is formed on a first cylindrical surface provided on a part of the coupling cylinder or the support plate portion, the direction of the center axis thereof being coincident with the pressing direction of the pressing sleeve. A first threaded portion, wherein the second engaging portion is a second threaded portion formed on a second cylindrical surface provided on a part of the protective cover and screwed with the first threaded portion. A pre-molded insulator pressing device according to claim 5.