JPH0777146B2 - Molding method of branch cable and molding structure of branch cable - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a method of molding a connection portion of a cable with a branch and a structure thereof, and in particular, even if the size and the number of branch wires are different, the finished outer diameter of the entire cable can be reduced in a short working time to mold the main body. The present invention relates to a method for molding a branched cable capable of performing the above, and a molded structure for a branched cable capable of preventing the finished outer diameter of the entire cable from increasing.

[Prior art]

Power lines and communication lines are used for each office building and home that use power and communication from the main line that is laid between utility poles and the main line that is buried in the ground. It is taken in and distributed to each room in this room. For connecting and terminating cables in the indoor wiring of such office buildings and home constructions, an electrician cuts each of the required number of cables to be connected to each other at a site such as in an electric pipe shaft. The coating material is peeled off, each terminal is connected using a crimping connector or the like, and then insulation processing is performed. However, the site space, such as in the electric pipe shaft,
It is narrow, and it takes more time than necessary to connect cables and perform wiring such as terminal treatment in such a narrow place.
It was a cause of lack of stable quality such as complete connection of cables and insulation of terminals. Also, in order to carry out the mounting work of the cable connection part on-site by carrying the vulcanizing mold etc., it is necessary to mold the cable connection part to process the end, so this work requires a long time and is practically used. There was a problem of lack of sex. Therefore, in recent years, in order to improve workability, a cable with a branch line has been used in which the connection of the cable, the terminal treatment, and the like are preassembled. An injection molding machine is generally used to manufacture such a preassembled cable with a branch line.
In this injection molding machine, a cable connecting portion is inserted into a mold, and resin is injected into the mold to perform resin molding. The mold used in such an injection molding machine can be opened and closed vertically (or left and right) to take out a molded product. Therefore, in order for the injection molding machine to operate well, the structure of the product that does not interfere with the opening and closing of the mold,
That is, it is necessary to set the arrangement structure of the cables. In order to open and close the mold, in the case of a cable with a branch,
The branch part is mainly one branch and two branches. In this case, 1
As shown in FIGS. 10 (A) and 10 (B), this branch has a trunk line 100.
The branch line 110 is attached to the main line 100 and the branch line 110 on the dividing line of the mold 130. Also, 2
As shown in FIGS. 11 (A) and 11 (B), this branch is a trunk line 100.
By arranging two branch lines 110 and 120 on both sides of the main line 100, the main line 100 and the branch lines 110 and 120 are arranged on the dividing line of the mold 130. Or 2
As shown in FIGS. 12 (A) and 12 (B), this branch is a main line 100.
The two branch lines 110 and 120 are collected on one side, the main line 100 and the branch lines 110 and 120 are arranged in a line, and the main line 100 and the branch lines 110 and 120 are provided side by side on the dividing line of the mold 130.

[Problems to be Solved by the Invention]

Thus, as shown in FIGS. 10 (A) and 10 (B), the trunk line 100
A branch line 110 is connected to the branch line 110, and the branch line 110 is attached to the main line 100 so as to be arranged in a dividing line of the mold 130.
In the case of the main branch, the molded part 200 in which the connection part between the trunk line 100 and the branch line 110 is resin-molded does not become so large and does not pose a problem. However, the eleventh (A), (B), or
As shown in FIGS. 12 (A) and 12 (B), when two or more branch lines 110, 120 are attached to the trunk line 100 at positions on both sides or one side, respectively, the branch lines 110, 120 are connected to the trunk line 100, Since the trunk line 100 and the branch lines 110 and 120 are lined up in a horizontal line on the plane and resin-molded, the trunk line 100 and the branch line 1
There is a problem that the mold parts 210 and 220 at the connection parts with the 10 and 120 become large. Further, the branch lines 110 and 120 are not always the same in diameter, but may be branch lines having different diameters. Branch line 11
If 0 and 120 do not have the same diameter, each time the size of the branch line connected to the main line 100 changes, the mold must be replaced with a mold that matches the size of the branch line, which complicates the work and There is a problem that it takes a lot of time to work the resin molding of the branch connection portion of the attached cable. An object of the first invention of the present application is to provide a method for molding a cable with a branch, which enables the main body to be molded with a reduced outer diameter of the entire cable in a short working time even if the size and the number of branch wires are different. To do. It is an object of a second invention of the present application to provide a molded structure of a branched cable capable of preventing the finished outer diameter of the entire cable from increasing when the branch connection portion is resin-molded.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, in the method for molding a cable with a branch according to the first aspect of the present invention, a trunk connector for connecting one or more branch conductors to the trunk conductor and branching is fixed by a compression connector. Then, one or more branch lines connected to the trunk line are bundled together and pre-molded with a resin into a predetermined shape to fix the branch line. Thereafter, the pre-molded portion is formed at the end of the branch line side holding groove. In a molding die provided with a fitting hole formed in the same shape as the above, the pre-molded part and the branch connection part of the main line are housed, and the pre-molded part and the branch connection part of the main line are put together by resin. The main body is molded. Further, in order to achieve the above object, in the molded structure of the cable with branch according to the second invention of the present application, two or more branch conductors are connected to the conductor of the trunk line, and the conductor of the trunk line and the conductor of the trunk line are connected to each other.
A pre-mold having a branch connecting part for fixedly connecting the conductors of two or more branch lines by a compression connector, and arranging two or more branch lines connected to the trunk line in a flat shape and resin-molding them in a predetermined shape in advance. And a branch connecting portion of the main line in a molding die having a fitting hole formed at the end of the holding groove on the branch line side in the same shape as the preliminary molding part. It is housed so as to fit along the main line, and a main body mold portion for resin-molding the branch connection main body is formed.

[Action]

A trunk connector for branching by connecting one or more branch conductors branched and connected to the trunk conductor is fixed by a compression connector, and one or more branch wires connected to the trunk are grouped together. Preliminarily mold the resin into a predetermined shape by fixing the branch line, and then, in the molding die provided with a fitting hole to be formed in the same shape as the premolded portion at the branch line side holding groove end, Since the main body is molded with resin by accommodating the pre-molded portion and the branch connection portion of the main line, and the pre-molded portion and the branch connection portion of the main line are combined to mold the main body, the size and number of the branch lines are different. However, it is possible to mold the main body while reducing the finished outer diameter of the entire cable in a short working time. Also, connect two or more branch conductors to the main conductor.
It has a branch connection part for fixedly connecting the conductor of the main line and the conductor of the two or more branch lines by a compression connector, and the two or more branch lines connected to the main line are arranged in a flat shape to be resin-molded in advance into a certain shape. Equipped with a pre-molded part
In the molding die having a fitting hole formed at the branch line side holding groove end with the same shape as the preliminary mold part, the branch connection part of the preliminary mold part and the trunk line is attached to the trunk line in the longitudinal direction of the longitudinal section. Since the main body mold part is formed so that the branch connection body is resin-molded, it is possible to prevent the finished outer diameter of the entire cable from increasing when the branch connection part is resin-molded. .

【Example】

Examples of the present invention will be described below. 1 to 4 show an embodiment of a method for molding a cable with a branch according to the present invention. In the figure, 1 is a cable with a branch, 2 is a trunk line, 3,
4 is a branch line. The trunk line 2 is, for example, an integrated power cable, and the branch lines 3 and 4 are electric wires for subdivision. The branch lines 3 and 4 are connected to the main line 2, and this connecting portion is connected by a compression connector 5. The two branch lines 3 and 4 are resin-molded in advance by a preliminary mold 6. The branch lines 3 and 4 including the preliminary mold 6 and the trunk line 2 are molded into a main body. Reference numeral 7 denotes a molding die for the cable with branch 1, which is composed of an upper die 8 and a lower die 9 as shown in FIG. The upper mold 8 is composed of a mold (not shown) and a nest 10, and the lower mold 9 is composed of a mold 11 and a nest 12. As shown in FIG. 3, the formwork 11 is formed in a rectangular box shape and has a storage portion 13. Further, rectangular cable escape portions 14 and 15 are formed at both end portions in the longitudinal direction of the formwork 11. After connecting the trunk line 2 and the branch lines 3 and 4 with the compression connector 5, the cable escape portions 14 and 15 connect the trunk line 2 and the branch lines 3 and 4 with the compression connector 5 when resin is molded. This is an escape to properly fix the parts other than the branch part. The nests 10 and 12 are molds for molding resin into the branch portions where the trunk line 2 and the branch lines 3 and 4 are connected by the compression connector 5, respectively. The trunk side line pressers 16 and 17 and the branch side line presser 1
It is composed of 8 and 19 and cores 20 and 21. The trunk side wire retainers 16 and 17 are provided with trunk side wire retainer grooves 22 and 23, and these trunk side wire retainer grooves 22 and 23 are for sealing the vicinity of the branch portion connected by the compression connector 5 of the trunk line 2. It is a thing. That is, in order to prevent the resin from leaking from between the main line 2 and the molding die 7 of the branch cable 1 when the main line 2 and the branch lines 3 and 4 are molded with resin in the portion connected by the compression connector 5. belongs to. In addition, the trunk side line retainer grooves 22 and 23 are also provided in the branch side line retainers 18 and 19. In addition, the branch side wire retainer grooves 24, 25
The branch side wire holding grooves 18 and 19 are provided for sealing the trunk lines 2 and the branch lines 3 and 4 near the branches connected by the compression connector 5 of the trunk lines 2 and 3 and 4, respectively. It is a thing. That is, when the main line 2 and the branch lines 3 and 4 are molded with a resin in the portion where the compression connector 5 is connected, the resin is removed from between the main line 2 and the branch lines 3 and 4 and the molding die 7 of the cable with branch 1. This is to prevent it from leaking out. Also, this branch side line presser 18,
The fitting hole 26A and the fitting hole 26B are provided in the fitting hole 26A and 26B for mounting the preliminary mold 6 which is provided to put the two branch lines 3 and 4 together. Mating hole 26
The fitting hole 26 is for closely mounting the pre-mold 6 and is formed in the same shape as the pre-mold 6. Molded grooves 27 are formed in the cores 20 and 21 at the branch portions where the trunk line 2 and the branch lines 3 and 4 are connected by the compression connector 5 and the main body is molded with resin. Mold 7 for branching cable 1 configured in this way
Is formed by mounting the nests 10 and 12 in the mold 11. As shown in FIG. 4, the nest 12 includes a trunk side line retainer 17 and a core.
21 and the branch side wire retainer 19 are fitted together and mounted in the formwork 11.
In addition, the nest 10 is, like the nest 12, a trunk side line retainer 16 and
The core 20 and the branch side wire retainer 18 are put together and mounted in an upper mold which is not shown. Then, the resin is injected into the mold groove 27 provided in the cores 20 and 21 to mold the main body.
Mold 28. The shape of the preliminary mold 6 is basically an elliptical shape, and the size change and the change in the number of branch lines are collected in the preliminary mold 6. Therefore, even if the branch lines 3 and 4 differ in size and number in the same trunk line, the resin molding work of the main body mold 28 can be continuously performed without replacing the entire mold. Further, even if the size of the main line 2 is different, the size range of the branch lines 3 and 4 is almost limited, so that the same size of resin mold is used to form the preliminary mold 6. It can be used in common with other trunk line sizes. As described above, the present invention focuses on the fact that, in the case of a branch cable, one branch has the simplest structure for resin-molding the branch portion, and the branch cable having two or more branch lines. Also in this case, the branch lines are grouped together in advance by pre-molding, and a cable close to one branch cable is created and molded into the main body. Since it is configured in this way, the main mold 2 and the branch line 3 are provided on the upper mold 8 and the lower mold 9 of the molding die 7 for the cable with branch.
In order to insert the cable with branch 1 constituted by 4 and 4, first, the branch lines 3 and 4 are connected to the trunk line 2, and this connection part is fixed by the compression connector 5. After that, the two branch lines 3 and 4 are resin-molded in advance by the preliminary mold 6. Thereafter, as shown in FIG. 4, the branch cable 1 is inserted into the branch cable molding die 7. And
Resin is injected into the molding die 7 by an injection molding machine (not shown). Therefore, in this embodiment, the branch line 3, which is connected to the trunk line 2,
4 are grouped together and molded with resin (preliminary mold 6). By providing this preliminary mold 6, a pressing groove (fitting hole) of the same size as the preliminary mold 6 is formed in the molding die 7. Even if the diameter of the branch line connected to the main line 2 changes or the number of branch lines changes, it is possible to connect all branch cable with one molding die without changing the molding die 7. Part resin molding can be performed. FIG. 5 to FIG. 9 show an embodiment of the molded structure of the cable with a branch according to the present invention. In FIG. 5, 50 is a branch cable, 51 is a trunk line,
52 and 53 are branch lines. The trunk line 51 is, for example, an integrated power cable, and the branch lines 52 and 53 are subdivision electric wires. The branch lines 52 and 53 are connected to the main line 51, and the connecting portion is connected by a compression connector 54. The two branch lines 52 and 53 are resin-molded in advance by a preliminary mold 55. The preliminary mold 55 is formed by arranging the branch lines 52 and 53, flattening them, and resin-molding the main mold 56. The preliminary mold 55 formed in the flat shape is attached to the trunk line 51 in a vertically long section as shown in FIG.
A main body mold 56 is formed from above with the preliminary mold 55 along the trunk 51 in a longitudinally long section. in this way,
The shape of the preliminary mold 55 is basically formed in an elliptical shape, and the change in size or the number of branch lines 52, 53 is collected in the preliminary mold 55. Therefore, the condition of the preliminary mold 55 differs depending on the size and the number of the branch lines 52 and 53. FIG. 7 shows a preliminary mold in which the number of branch lines is two and the two branch lines have the same size. Further, FIG. 8 shows a preliminary mold in which the number of branch lines is two and the sizes of the two branch lines are different from each other. Further, FIG. 9 shows a pre-mold having the simplest structure among the branched cables with one branch line. When the number of branch lines is three, the three branch lines are arranged in a triangular shape, and when the number of branch lines is four, the four branch lines are combined to form a quadrangle. However, the outer shape and size of the preliminary mold are basically the same regardless of the size and the number of branch lines.

【The invention's effect】

Since the present invention is configured as described above, it has the effects described below. A trunk connector for branching by connecting one or more branch conductors branched and connected to the trunk conductor is fixed by a compression connector, and one or more branch wires connected to the trunk are grouped together. Preliminarily mold the resin into a predetermined shape by fixing the branch line, and then, in the molding die provided with a fitting hole to be formed in the same shape as the premolded portion at the branch line side holding groove end, Since the main body is molded with resin by accommodating the pre-molded portion and the branch connection portion of the main line, and the pre-molded portion and the branch connection portion of the main line are combined to mold the main body, the size and number of the branch lines are different. However, it is possible to mold the main body while reducing the finished outer diameter of the entire cable in a short working time. Also, connect two or more branch conductors to the main conductor.
It has a branch connection part for fixedly connecting the conductor of the main line and the conductor of the two or more branch lines by a compression connector, and the two or more branch lines connected to the main line are arranged in a flat shape to be resin-molded in advance into a certain shape. Equipped with a pre-molded part
In the molding die having a fitting hole formed at the branch line side holding groove end with the same shape as the preliminary mold part, the branch connection part of the preliminary mold part and the trunk line is attached to the trunk line in the longitudinal direction of the longitudinal section. Since the main body mold part is formed so that the branch connection body is resin-molded, it is possible to prevent the finished outer diameter of the entire cable from increasing when the branch connection part is resin-molded. .

[Brief description of drawings]

1 to 4 show an embodiment of a method for molding a cable with a branch according to the present invention. FIG. 1 is an overall cross-sectional configuration diagram of a cable with a branch body molded in a branch portion, and FIG. 1 is an overall exploded perspective view of a mold insert used in the method of molding a branched cable shown in FIG. 3, and FIG. 3 is an overall perspective view of a mold frame used in the method of molding a branched cable shown in FIG. FIG. 4 is a view for explaining a molding method of a method for molding a cable with a branch, FIGS. 5 to 9 show an embodiment of a mold structure for a cable with a branch according to the present invention, and FIG. 6 is an overall perspective view of the branch cable with the main part molded in the portion, FIG. 6 is a sectional view taken along the line AA of the branch cable shown in FIG. 5, and FIG. 7 shows a pre-mold in the case of two branch lines of the same size. Figures and 8 are different sizes.
FIG. 9 is a diagram showing a preliminary mold in the case of two branch lines, FIG. 9 is a diagram showing the preliminary mold in the case where the number of branch lines is one, and FIG.
Figures (A) and (B) are views showing a conventional molding method when there is one branch line, and Figures 11 (A) (B) and 12 (A)
(B) is a figure which shows the conventional molding method in case the number of branch lines is two. 1,50 …… Cable with branch 2,51 …… Main line 3,4,52,53 …… Branch line 5,54 …… Compression connector 6,55 …… Preliminary mold 7 …… Molding die 28,56 …… Body mold

Claims (2)

[Claims] 1. A main line branching part for connecting and branching one or more branch line conductors to a main line conductor is fixed by a compression connector, and one or more branch lines connected to the main line are grouped together. Then, the branch line is fixed by pre-molding with a resin to a predetermined shape, and then a molding die having a fitting hole for forming the same shape as the pre-molded portion at the branch line side holding groove end, A method for molding a cable with a branch, characterized in that the pre-molded part and the branch connection part of the main line are housed, and the main body is molded with resin by combining the pre-molded part and the branch connection part of the main line. . 2. A branch connecting portion for connecting two or more branch line conductors to a main line conductor and fixedly connecting the main line conductor and two or more branch line conductors by a compression connector, Two or more branch lines connected to the main line are arranged in a flat shape and preliminarily molded by a resin to have a certain shape, and a pre-molded portion is provided. The preliminary mold part and the branch connection part of the main line are housed in a molding die having a fitting hole so as to be along the main line in the longitudinal direction of the longitudinal section, and a main body mold part for resin-molding the branch connection main body is formed. The molded structure of the cable with a branch characterized in that