CN217506915U - Prefabricated branch cable - Google Patents
Prefabricated branch cable Download PDFInfo
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- CN217506915U CN217506915U CN202221287703.3U CN202221287703U CN217506915U CN 217506915 U CN217506915 U CN 217506915U CN 202221287703 U CN202221287703 U CN 202221287703U CN 217506915 U CN217506915 U CN 217506915U
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- branch
- cable
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Abstract
The utility model discloses a prefabricated branch cable, including main cable, branch cable and prefabricated branch cable connector, prefabricated branch cable connector adopts the connector to wrap up main cable conductor and branch cable conductor completely to inseparable crimping is on main cable conductor and branch cable conductor, the connector is ring shape, has radial strengthening rib. Compared with the prior art, the utility model has the positive effects that: the utility model discloses an accurate design to the selection material and the size of connector panel, utilize the modified branch compression to connect simultaneously and sticis the mould, prepare out the connector of specific structure through punching press and confined pressure technology, guarantee that the coefficient of sticising of prefabricated branch cable conductor when second compression deformation satisfies the demands to make the conductor resistance of compression connection back branch cable branch connector, thermal cycle temperature rise value and tensile strength degree all obtain excellent performance index, and have very big rich redundancy.
Description
Technical Field
The utility model relates to a prefabricated branch cable.
Background
The conductor of the prefabricated branch cable is easy to oxidize and creep, so that the contact (surface) resistance is increased, and the technical difficulty of the cable branch compression connection process is also caused. In the production process of the prefabricated branch cable, the cable conductor needs to be subjected to compression deformation twice, the first compression deformation is the conductor compression molding in the cable production process, and the second compression deformation is the compression connection of the cable branches, if the compression coefficient (the ratio of the actual sectional area of the compressed conductor to the sectional area of the outline of the compressed conductor) of the conductor is too large after the two compression deformations, the conductor is deformed greatly and becomes hard, so that the resistance and the heat cycle temperature rise value of the conductor at the connection part are increased; conversely, if the conductor compression coefficient is too low, the compression between the connector and the conductor and between the main conductor and the branch conductor may be too loose, which may increase the contact resistance of the branch connector and may also increase the thermal cycling temperature rise. Therefore, the selection of the compaction coefficient when the conductor is compacted and formed in the cable production process and the selection of the compaction coefficient when the prefabricated branch cable is in compression connection are key technologies of the branch compression connection process of the prefabricated branch cable. Meanwhile, the prefabricated branch cable connector is one of the key components of the prefabricated branch cable, and the selection of the material and the manufacturing method determine the service life of the prefabricated branch cable and the safety of an electric system.
SUMMERY OF THE UTILITY MODEL
In order to overcome the shortcoming of the prior art, the utility model provides a prefabricated branch cable.
The utility model adopts the technical proposal that: the utility model provides a prefabricated branch cable, includes trunk cable, branch cable and prefabricated branch cable connector, prefabricated branch cable connector adopts the connector to live trunk cable conductor and branch cable conductor parcel completely to closely the crimping is on trunk cable conductor and branch cable conductor, the connector is the ring shape, has radial strengthening rib.
Compared with the prior art, the utility model has the positive effects that:
the utility model discloses a to the selection material of connector panel and the accurate design of size, utilize the modified branch compression to connect simultaneously and sticis the mould, prepare out the connector of specific structure through punching press and confined pressure technology, guarantee that the coefficient of sticising of prefabricated branch cable conductor when second compression deformation (prefabricated branch cable branch compression is connected) satisfies the requirement, thereby make the conductor resistance of compression connection back branch cable branch connector, thermal cycle temperature rise value and tensile strength all obtain excellent performance index, and have (compare with the standard) very big richness. The utility model discloses fully guarantee the produced grip strength elasticity of connector after the crimping moderate degree when confining pressure, ensure that the union is stable at operation in-process electrical performance.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural view of a prefabricated drop cable;
FIG. 2 is a schematic structural view of a connector panel;
FIG. 3 is a schematic structural view of a U-shaped metal ring;
FIG. 4 is a schematic structural view of an upper die of a symmetrical confining pressure die;
FIG. 5 is a schematic structural view of a lower die of a symmetrical confining pressure die;
FIG. 6 is a schematic view showing a state of confining pressure to the U-shaped metal ring;
FIG. 7 is a schematic view of a pre-formed branched compression connector;
FIG. 8 is a schematic view showing a state in which a branched compression connector is formed by confining pressure;
FIG. 9 is a schematic view of the connector;
the reference numbers in the figures include: trunk cable restrictive coating 1, trunk cable conductor insulating layer 2, trunk cable conductor 3, connector 4, branch cable restrictive coating 5, branch cable conductor insulating layer 6, branch cable conductor 7, upper die base 8, first holding screw 9, go up mould 10, lower mould 11, second holding screw 12, die holder 13, radial strengthening rib 14, axial strengthening rib 15, U-shaped becket 16.
Detailed Description
A prefabricated drop cable, the structure of which is shown in fig. 1, comprising: trunk cable restrictive coating 1, trunk cable conductor insulating layer 2, trunk cable conductor 3, connector 4, branch cable restrictive coating 5, branch cable conductor insulating layer 6 and branch cable conductor 7 etc. wherein:
the connector 4 is annular and is provided with a radial reinforcing rib 14 and an axial reinforcing rib 15, and the diameter of the radial reinforcing rib 14 is 90-99% of the outer diameter d of the connector.
The material of the connector 4 is the same as or similar to that of the cable conductor, so that electrochemical corrosion is avoided. The connector for the aluminum alloy branch cable is made of an aluminum alloy material with the mark of LHP8000, and the connector for the copper core branch cable is made of a copper material with the mark of T2.
The connector 4 is made of a rectangular plate material having a structure as shown in fig. 2, wherein: l is the length of the connector plate; b is the width of the connector plate, and is selected according to specifications of the trunk cable and the branch cable, and the value is 20-40 mm; delta is the thickness of the connector plate, and the value is 3-6 mm.
The length L of the connector plate is calculated according to the following formula:
in the formula, D Master and slave The diameter of a main cable conductor (the diameter of a special-shaped conductor is an equivalent circle), mm;
D branch stand Is the diameter of the branch cable conductor, mm;
k is an adjusting coefficient and takes the value of 0.95-1.0;
δ is the connector thickness, mm.
The connector 4 completely wraps the main cable conductor 3 and the branch cable conductor 7, and is tightly pressed on the main cable conductor 3 and the branch cable conductor 7 to form a prefabricated branch cable connector.
The manufacturing process of the prefabricated branch cable connector comprises the following steps:
step one, stamping the connector plate into a U-shaped metal ring
The structure of the U-shaped metal ring is shown in FIG. 3, wherein: c is the groove width of the U-shaped metal ring; b is the width of the connector plate, namely the length of the U-shaped metal ring; h is the height of the U-shaped metal ring.
The symmetry of the U-shaped metal ring needs to be kept during stamping, and the groove width C of the U-shaped metal ring needs to be slightly larger than the maximum overall dimension of the main cable conductor.
Step two, confining pressure U-shaped metal ring
The U-shaped metal ring is confined by adopting a symmetrical confining pressure die with the structure shown in figures 4 and 5, the applied pressure and the pressure maintaining time depend on the thickness of the connector, and the applied pressure is 2-8 MPa and the pressure maintaining time is 3-7 seconds in general.
The symmetrical confining pressure die comprises an upper die and a lower die, wherein the upper die structure of the stamping die is shown in figure 4, and the lower die structure of the stamping die is shown in figure 5. Wherein, the upper die and the lower die are both designed with reinforcing ribs. The number of the reinforcing ribs can be 1 or more.
During confining pressure, the proper tightness of the gripping force generated by the connector after compression joint is fully ensured, and the stable electrical performance of the connector in the operation process is ensured.
The method comprises the following specific steps:
(1) installation and debugging of symmetrical confining pressure mould
When the symmetrical confining pressure die is installed, an upper die 10 and a lower die 11 are respectively and fixedly installed on an upper die base 8 and a lower die base 13 through a first set screw 9 and a second set screw 12; then, the upper die base and the lower die base are adjusted to ensure that the semicircular grooves of the upper die and the lower die are positioned on the same vertical line, and the gaps 'e' between the two sides of the semicircular groove of the upper die and the two sides of the lower die are equal, as shown in fig. 6.
After the symmetrical confining pressure die is installed, when the pressure application range value of the oil press is adjusted, a wood block with the thickness of about 100mm is placed between the upper die and the lower die, and the phenomenon that the pressure of the oil press exceeds the rated pressure due to misoperation in the pressure adjusting process, so that the working area of the die is damaged is avoided.
(2) Prepressing forming of branched compression connector
Arranging and fixing the U-shaped metal ring 16 with the opening facing downwards on a prepressing tool, clamping the main cable conductor 3 into the U-shaped metal ring, and pressing the groove width C of the U-shaped metal ring by the prepressing tool by 3-5 mm; then the branch cable conductor 7 is placed at the bottom of the U-shaped metal ring groove to ensure that the tail end of the branch cable conductor is flush with the outer end of the U-shaped metal ring and is tightly contacted with the main cable conductor; and finally, prepressing and forming the branch compression connector by adopting a prepressing tool, as shown in figure 7.
(3) Confining pressure forming
The branch compression connecting body formed by prepressing is arranged in a lower die of an oil press, the center of the section of the branch compression connecting body is kept on the vertical center of the lower die, the opening of a U-shaped metal ring 16 faces downwards, the oil press is started, a descending control handle of the oil press is controlled according to the set pressure application range and pressure application time, the branch compression connecting body is enabled to generate uniform compression deformation under the symmetrical stable surrounding pressure of the oil press die, and the tight compression connection forming without any damage trace is realized, as shown in fig. 8.
After confining pressure is finished, the opening of the U-shaped metal ring 16 is folded, the U-shaped metal ring is tightly pressed on the main cable conductor 3 and the branch cable conductor 7 to form a connector 4, the connector 4 is provided with a radial reinforcing rib 14 which is generated after a mold is symmetrically confined and is uniformly compressed and deformed and realizes tight compression connection and forming, and two axial reinforcing ribs 15 which are formed at the folding position of the semicircular grooves of the upper mold and the lower mold and are bilaterally symmetrical (as shown in figure 9), burrs, cracks and any damage trace can not be generated, and the sheath and the insulation of other parts of the cable can not be damaged.
Claims (7)
1. A prefabricated drop cable, comprising: including trunk cable, branch cable and prefabricated branch cable connector, prefabricated branch cable connector adopts the connector to wrap up trunk cable conductor and branch cable conductor completely to closely the crimping is on trunk cable conductor and branch cable conductor, the connector is the ring shape, has radial strengthening rib.
2. A prefabricated drop cable according to claim 1, wherein: the diameter of the radial reinforcing rib is 90% -99% of the outer diameter of the connector.
3. A prefabricated drop cable according to claim 1, wherein: the connector is provided with two axial reinforcing ribs which are symmetrical left and right.
4. A prefabricated drop cable according to claim 1, wherein: the connector is made of an aluminum alloy material with the mark number of LHP 8000.
5. A prefabricated drop cable according to claim 1, wherein: the connector is made of a rectangular plate with the length of L, the width of B and the thickness of delta.
6. A pre-fabricated drop cable according to claim 5, wherein: the value of B is 20-40 mm.
7. A pre-fabricated drop cable according to claim 5, wherein: the delta value is 3-6 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221287703.3U CN217506915U (en) | 2022-05-27 | 2022-05-27 | Prefabricated branch cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221287703.3U CN217506915U (en) | 2022-05-27 | 2022-05-27 | Prefabricated branch cable |
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| Publication Number | Publication Date |
|---|---|
| CN217506915U true CN217506915U (en) | 2022-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221287703.3U Active CN217506915U (en) | 2022-05-27 | 2022-05-27 | Prefabricated branch cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114898914A (en) * | 2022-05-27 | 2022-08-12 | 四川蓝电电缆科技有限公司 | Prefabricated branch cable and manufacturing method thereof |
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2022
- 2022-05-27 CN CN202221287703.3U patent/CN217506915U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114898914A (en) * | 2022-05-27 | 2022-08-12 | 四川蓝电电缆科技有限公司 | Prefabricated branch cable and manufacturing method thereof |
| CN114898914B (en) * | 2022-05-27 | 2023-11-14 | 四川蓝电电缆科技有限公司 | Prefabricated branch cable and manufacturing method thereof |
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