CN112490769A

CN112490769A - Multi-strand core wire three-section type electric connector and connection method thereof

Info

Publication number: CN112490769A
Application number: CN202011346918.3A
Authority: CN
Inventors: 李俊; 张雪琴; 葛臻楠
Original assignee: Jiangnan Shipyard Group Co Ltd
Current assignee: Jiangnan Shipyard Group Co Ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-03-12
Anticipated expiration: 2040-11-26
Also published as: CN112490769B

Abstract

The invention provides a multi-strand core wire three-section type electric connector which comprises a plug section, a connecting section and a tail clamping section, wherein the plug section, the connecting section and the tail clamping section are axially and sequentially arranged; the plug section comprises a plug section body and a plug locking ring, the plug locking ring is sleeved on the peripheral surface of the plug section body, and one end of the plug section body, which is close to the connecting section, is provided with a plurality of welding needles; one end of the tail clamping section, which is far away from the connecting section, is provided with a clamping part; one end of the tail clamping section, which is close to the connecting section, is provided with a pressing ring, the pressing ring comprises an elastic ring, and at least one part of the elastic ring is inwards convex in the radial direction to form an annular extrusion part; the multi-strand core wire three-section type electric connector has the advantages of simple structure, simple and convenient manufacturing method, high production efficiency, lower cost, basically no pollution, firmness and reliability, and can be suitable for connecting the three-section type electric connector of the shipboard electronic cabinet.

Description

Multi-strand core wire three-section type electric connector and connection method thereof

Technical Field

The invention relates to the field of electric connectors, in particular to a multi-strand core wire three-section type electric connector and a connecting method thereof.

Background

Patent 200810070414.6 entitled "winding and embedding type assembled cable joint and manufacturing method thereof" mainly describes the manufacturing method of the joint of single-core cables. The cable connection of the electronic cabinet on the ship relates to the requirements of electromagnetic compatibility and electrical performance such as grounding, shielding, filtering and the like, and a multi-strand core cable is often adopted, so that the electric connector and the connection method are not suitable for manufacturing the multi-strand core cable electric connector of the electronic cabinet on the ship.

The multi-strand core wire electric connector and the connecting method in the existing market cannot play a role in protecting the mechanical vibration of the cable, and the connecting cable is easy to break and the like; and, the cable has poor water tightness after being connected with the electric connector.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention provides a three-stage electrical connector with multiple core wires, which is simple in structure, strong and reliable.

The invention provides a multi-strand core wire three-section type electric connector which comprises a plug section, a connecting section and a tail clamping section, wherein the plug section, the connecting section and the tail clamping section are axially and sequentially arranged; the plug section comprises a plug section body and a plug locking ring, the plug locking ring is sleeved on the peripheral surface of the plug section body, and one end of the plug section body, which is close to the connecting section, is provided with a plurality of welding pins; one end of the tail clamping section, which is far away from the connecting section, is provided with a clamping part, the clamping part comprises a clamping screw and at least two arc-shaped clamping pieces, and the at least two clamping pieces are connected end to end through the clamping screw; the one end that the tail presss from both sides the section and is close to the linkage segment is provided with the clamping ring, the clamping ring includes the elastic ring, and at least some radial inside of this elastic ring is protruding, forms annular extrusion portion.

Further, the clamping ring further comprises a metal ring.

Further, the tail clamp section comprises a tail clamp body, an annular groove is formed in the inner surface of the tail clamp body, and the pressing ring is located in the annular groove.

Furthermore, a butt joint component is arranged in the connecting section and comprises a first annular abutting portion and a second annular abutting portion, a first abutting surface is arranged on the first annular abutting portion, and a second abutting surface which is in abutting fit with the first abutting surface is arranged on the second annular abutting portion.

Further, the tight clamping ring is located between the second annular abutting portion and the tail clamping section body, and the two end faces of the tight clamping ring abut against the second annular abutting portion and the tail clamping section body respectively.

Further, a bushing is connected in the connecting section, and the bushing extends from one end of the connecting section close to the plug section to one end of the tail clamp section.

Further, the first annular abutting portion is connected to one end, far away from the plug section, of the bushing.

The invention also provides a connecting method of the multi-strand core wire three-section type electric connector, which sequentially comprises the following steps:

s1, cutting the cable insulation sheath of the cable by 2cm to 3cm, straightening the core wire of the cable, and stripping the insulation layer on the core wire by 3-4 mm; sealing the end part of the residual cable insulating sheath on the cable by using an electrical adhesive tape to form a protective adhesive tape layer;

s2, pre-sheathing an insulating sleeve on the core wire and a protective insulating heat-shrinkable sleeve on the cable before welding the core wire and the welding needle; welding the core wire with a welding needle; after the core wire is welded with the welding needle, the exposed core wire and the welding needle are wrapped by the insulating sleeve;

s3, leading out a grounding wire on a shielding layer of the cable;

and S4, connecting the protective insulating heat-shrinkable sleeve into the connecting pipe after heat shrinkage, fixing the protective insulating heat-shrinkable sleeve by using the clamping part, exposing the tail clamping section of the protective insulating heat-shrinkable sleeve part, and grounding the grounding wire.

Further, in the step S1, a cold peeling process is used to perform core wire insulation removal; and stranding the stranded core wires after the insulation removal according to the original stranding direction, and carrying out tin coating treatment on the stranded core wires.

As described above, the multi-strand core wire three-section type electrical connector and the connection method thereof according to the present invention have the following advantages:

the multi-strand core wire three-section type electric connector is simple in structure, simple and convenient in manufacturing method, high in production efficiency, low in cost, basically free of pollution, firm and reliable, and suitable for connection of a ship electronic cabinet three-section type electric connector. According to the connecting method of the multi-strand core wire three-section type electric connector, the clamping part locks the part, which is not split, of the cable, so that the anti-seismic function of the cable connection of the three-section type electric connector is enhanced, and therefore the core wires of the cable are protected from being broken easily under the condition that a traveling ship vibrates continuously, and the mechanical protection effect is achieved; and the clamping part of the cable electric connector is reliably fastened with the protective insulating heat-shrinkable sleeve of the cable, and the insulating heat-shrinkable sleeve used in the region with the protection requirement is tightly heat-shrunk, so that the water tightness of the cable connection is improved.

Drawings

FIG. 1 is a schematic diagram of a multi-strand three-section electrical connector according to a first embodiment;

FIG. 2 is a schematic half-sectional view of a first embodiment of a multi-strand core three-section electrical connector;

FIG. 3 is a rear view of a first embodiment of a multi-strand three-piece electrical connector;

FIG. 4 is a schematic diagram of a cable stripped in connection with an embodiment of a multi-strand, three-section electrical connector;

FIG. 5 is a cross-sectional view of an embodiment of a multi-strand three-piece electrical connector after connection to a cable;

FIG. 6 is a schematic diagram of an embodiment of a multi-strand three-section electrical connector after connection to a cable;

FIG. 7 is a schematic diagram of a second embodiment of a multi-strand three-section electrical connector;

FIG. 8 is a half sectional view of a second embodiment of a multi-strand core three-piece electrical connector;

FIG. 9 is a schematic diagram of a cable stripped away when connected to a second embodiment of a multi-strand, three-section electrical connector;

FIG. 10 is a cross-sectional view of a second embodiment of a multi-strand, three-piece electrical connector shown connected to a cable;

FIG. 11 is a schematic diagram of a multi-strand three-segment electrical connector after connection with a cable according to a second embodiment.

Reference numerals:

100. a plug section; 200. a connecting section; 300. a tail clamp section; 110. a plug section body; 120. a plug locking ring; 130. welding pins; 311. clamping a screw; 312. a clamping piece; 320. tightly pressing the ring; 321. an elastic ring; 322. an annular extrusion portion; 323. a metal ring; 324. a metal gasket; 330. a tail clip section body; 331. an annular groove; 400. an abutment assembly; 410. a first annular abutting portion; 411. a first abutting surface; 420. a second annular abutting part; 421. a second abutting surface; 430. a bushing; 500. a connecting spiro ring; 600. a cable; 610. a core wire; 620. a cable insulation sheath; 630. an insulating sleeve; 640. a protective insulating heat-shrinkable sleeve; 650. a protective tape layer; 660. a ground line; 661. cold pressing the joint; 670. an adhesive tape layer for adjusting the diameter of the cable.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship may be made without substantial technical changes.

As shown in fig. 1, fig. 2, fig. 3, fig. 5, fig. 7, fig. 8 and fig. 10, the multi-strand core wire three-section electrical connector provided by the present application includes a plug section 100, a connecting section 200 and a tail clamp section 300, which are axially arranged in sequence, wherein the plug section 100 and the connecting section 200, and the connecting section 200 and the tail clamp section 300 are in threaded connection; the plug section 100 comprises a plug section body 110 and a plug locking ring 120, the plug locking ring 120 is sleeved on the outer peripheral surface of the plug section body 110, and one end of the plug section body 110 close to the connecting section 200 is provided with a plurality of welding pins 130; one end of the tail clamping section 300, which is far away from the connecting section 200, is provided with a clamping portion, which includes a clamping screw 311 and at least two arc-shaped clamping pieces 312, and the at least two clamping pieces 312 are connected end to end through the clamping screw 311. One end of the tail clamping section 300 close to the connecting section 200 is provided with a compression ring 320, and the compression ring 320 comprises an elastic ring 321, at least one part of the elastic ring 321 protrudes inwards in the radial direction to form an annular extrusion part 322.

When the multi-strand core wire three-section type electric connector and the cable are used for connection, the plug section 100 and the connecting section 200, the connecting section 200 and the tail clamping section 300 are respectively subjected to thread disassembly, and after the cable insulating sheath 620 of the cable 600 is disassembled, the core wire 610 of the cable 600 is welded on the welding needle 130, so that the cable 600 and the electric connector are preliminarily fixed. Then, the free end of the cable 600 is passed through the connecting section 200 and the tail clamp section 300 in sequence, the connecting section 200 and the plug section 100 are screwed, and then the clamping piece 312 clamps the cable by the clamping screw 311, so as to further strengthen and fix the cable on the multi-strand core wire three-section type electric connector. The annular pressing portion 322 of the pressing ring 320 abuts against the outer peripheral surface of the cable 600, so that the arrangement of the pressing ring 320 can fix the cable 600 on the multi-strand core three-section electrical connector more firmly. In actual operation, an electrical tape may be wound around the outer circumference of the cable 600 at a position corresponding to the position of the compression ring 320 to form a cable diameter adjusting tape layer 670, and the cable diameter adjusting tape layer 670 is locked by the compression ring 320. The multi-strand core wire three-section type electric connector has the advantages of simple structure, simple and convenient manufacturing method, high production efficiency, lower cost, basically no pollution, firmness and reliability, and can be suitable for connection of the three-section type electric connector of the shipboard electronic cabinet

Preferably, the clamping ring 320 further comprises a metal ring 323. The metal ring 323 is provided to ensure the continuity of the cable shield.

The arrangement of the clamping ring 320 on the multi-strand core wire three-section type electrical connector can adopt two preferred modes, and two corresponding embodiments are provided by the invention.

Multi-strand core wire three-section type electrical connector

As shown in fig. 1, 2 and 5, the tail clip section 300 includes a tail clip body 330, an annular groove 331 is formed on an inner surface of the tail clip body 330, and the pressing ring 320 is located in the annular groove 331. The annular groove 331 is provided to facilitate axial fixation of the clamping ring 320 in the multi-strand core wire three-segment electrical connector. In this embodiment, the annular groove 331 extends axially to the connecting section 200, and one end surface of the annular groove 331 is an end surface located at the end of the connecting section 200. The clamping ring 320 in the annular groove 331 is sequentially provided with a first elastic ring, a metal ring 323 and a second elastic ring along the direction of the plug section 100 pointing to the tail clip section 300, the first elastic ring and the second elastic ring jointly form the elastic ring 321 of the clamping ring 320, wherein one side of the second elastic ring close to the metal ring 323 is radially inwards convex to form an annular extrusion part 322.

Multi-strand core wire three-section type electrical connector

As shown in fig. 7, 8 and 10, an abutting assembly 400 is disposed in the connecting section 200, the abutting assembly 400 includes a first annular abutting portion 410 and a second annular abutting portion 420, a first abutting surface 411 is disposed on the first annular abutting portion 410, and a second abutting surface 421 which is in abutting fit with the first abutting surface 411 is disposed on the second annular abutting portion 420. Before this embodiment is connected to the cable 600, as shown in fig. 9, the cable insulating sheath 620 may be cut open, and the portion may be treated with an electrical tape to form a protective tape layer 650. The protective adhesive tape layer 650 is substantially a truncated cone-shaped cavity, the first abutting surface 411 and the second abutting surface 421 are respectively conical surfaces, and when the cable 600 is connected with the multi-strand core wire three-section type electrical connector, the first annular abutting portion 410 extends into the cavity of the cable protective layer to abut against and match with the second annular abutting portion 420. Further ensuring that the relative position of the cable 600 remains unchanged after connection with the electrical connector.

Meanwhile, as shown in fig. 8, the pressing ring 320 is located between the second annular abutting portion 420 and the tail clip portion body 330, and two end surfaces of the pressing ring 320 abut against the second annular abutting portion 420 and the tail clip portion body 330, respectively. The abutting engagement of the clamping ring 320 and the second annular abutting portion 420 facilitates the installation process of the cable 600 and the electrical connector. In this embodiment, the inner circumference of the elastic ring 321 of the pressing ring 320 is entirely protruded radially inward to form an annular pressing portion 322. Meanwhile, the pressing ring 320 further includes metal pads 324 disposed at two end sides of the elastic ring 321, wherein one metal pad 324 is located between the elastic ring 321 and the second annular pressing portion 420, and the other metal pad 324 is located between the elastic ring 321 and the bottom surface of the annular groove 331 in the tail clip segment 300.

As shown in fig. 8 and 10, a bushing 430 is connected to the connecting section 200, and the bushing 430 extends from an end of the connecting section 200 close to the plug section 100 toward an end of the tail clamp section 300. The cable bushing 430 may further ensure the reliability of the shielding of the cable. Meanwhile, the first annular abutting portion 410 is connected to one end of the bushing 430 far away from the plug section 100, so that the connecting section 200 is simple in structure and convenient to manufacture.

As shown in fig. 2, fig. 4, fig. 5, fig. 8, fig. 9 and fig. 10, the present invention further provides a connection method of the multi-strand three-section electrical connector, which sequentially includes the following steps:

1) cutting off 2cm to 3cm of a cable insulation sheath 620 of the cable 600, straightening a core wire 610 of the cable, and stripping off an insulation layer on the core wire 610 by 3-4 mm; sealing the end of the cable insulation sheath 620 left on the cable 600 with an electrical tape to form a protective tape layer 650; 2) pre-sheathing an insulating sleeve 630 over the core wire 610 and a protective insulating heat shrink 640 over the cable 600 before the core wire 610 is welded to the welding pin 130; welding the core wire 610 with the welding pin 130; after the core wire 610 is welded with the welding needle 130, the exposed core wire 610 and the welding needle 130 are wrapped by the insulating sleeve 630; 3) a grounding wire 660 is led out of the shielding layer of the cable 600; 4) the protective insulating heat-shrinkable sleeve 640 is connected into the connecting pipe after being heat-shrunk, the protective insulating heat-shrinkable sleeve 640 is fixed by the clamping part, the tail clamping section 300 is partially exposed out of the protective insulating heat-shrinkable sleeve 640, and the grounding wire 660 is grounded.

As shown in fig. 5 and 10, in step 1), the cut-off size of the cable insulating sheath 620 is only 2cm to 3cm, and the clamping portion of the three-segment electrical connector is locked at the non-cut-off portion of the cable 600, so that the anti-seismic function of the electrical connector when being connected with the cable 600 is improved, and the core wire 610 of the cable 600 is protected from being easily broken under the condition that the traveling vessel is vibrating continuously, thereby achieving the mechanical protection effect. If the number of the core wires 610 of the cable 600 is larger than that of the core wires 610 to be welded, the welding construction can not be performed according to the requirements, the cable insulating sheath 620 can be cut off according to the method, then the cable insulating sheath 620 is longitudinally cut open to a certain size, and after the core wires 610 are welded, the cut-open part is wound and restored by using the electric adhesive tape.

As shown in fig. 5 and 10, in the step 3), the grounding line 660 is led out from the shielding layer of the cable 600, so that the electromagnetic compatibility is enhanced and the GJB grounding requirement is met. The grounding wire 660 has two leading-out modes, the first mode is that a conducting wire is welded on a shielding layer to form the grounding wire 660 led out of the shielding layer; the second type is that 3 ~ 8 strands of shielding layer braided wire are picked out in the shielding layer, and the insulating pyrocondensation sleeve pipe wraps up behind the shielding layer braided wire pyrocondensation insulation, forms the earth connection 660 of drawing forth from the shielding layer. Wherein, the diameter of the grounding wire 660 is 3-4 mm. The length and form of the shield lead (i.e., ground line 660) is determined by the field conditions, for example, as shown in FIG. 5: the lead-out length may be about 8cm, and the ground wire 660 is an arc having a radius of about 25mm, and one end of the ground wire 660 is crimped to the cold crimping connector 171, and a heat-shrinkable sleeve is fitted over the insulation crimping end, uniformly grounded nearby, and fixed to the clamp screw 311. The grounding wire 660 is as short as possible, and the plugging operation of the electric connector can be ensured, so that the uniformity and the attractiveness of the electric connector on the cabinet can be ensured,

preferably, in step 1), the core wire 610 is subjected to insulation removal using a cold stripping process. And stranding the stranded core wires 610 with the removed insulation according to the original stranding direction, and carrying out tin coating treatment on the stranded core wires 610. In particular, use ofAnd stripping wires 610 by using a wire stripper and a wire stripping tool. Of course, a thermal control wire stripper can be used, the core wire 610 of the cable 600 is stripped by adopting a thermal stripping method, the thermal control wire stripper is matched with the core wire 610 in specification, the insulation skin is not burnt, and the color change length of the insulation skin is not more than 2 mm. The stranded core wires 610 are stranded in the original stranding direction, the stranding is uniform and straight, tin coating treatment is needed after the stranding, and tin coating treatment is needed for welding spots before the electric connector is welded. A constant-temperature electric iron is used for welding the electric connector of the cable 600, the corresponding temperature is selected according to the thickness of a core wire 610, the thin wire is set to be 300 +/-10 ℃, and the thick wire is set to be 350 +/-10 ℃. Wherein the inner diameter of the thin wire is less than 2.5mm²The inner diameter of the thick line is larger than 2.5mm². The protective insulating heat-shrinkable sleeve 640 is exposed out of the tail clamp by about 20mm, the clamping part of the cable 600 electric connector is reliably fastened with the outer sheath of the cable 600, and the heat-shrinkable sleeve used in an area with a protection requirement needs to be tightly heat-shrunk, so that the water tightness of the connection of the cable 600 is improved.

It should be noted that, when the multi-strand three-section electrical connector is connected to the cable 600, the relevant work may be performed in advance. For example, after the equipment cabinet is installed in the cabin or the equipment installation template is pre-installed, the cable 600 can be cut and wired. The cable 600 at the cabinet entrance should be left with the proper amount of telescoping and movement. In order to ensure the unity of the attractiveness of the cabin, wires, bridging grounding wires, IV lapping strips and the like used on an equipment cabinet and a chassis are gray; 1.5mm for use in an electrical connector²And 2.5mm²The two kinds of specification wires of (1); the bridging grounding wire and the lapping strip are black; the insulating rubberized fabric and the heat-shrinkable sleeve are black. The used heat-shrinkable sleeve is made of fireproof flame-retardant material and does not contain glue. The heat-shrinkable sleeve for wiring is of a non-adhesive type, and the heat-shrinkable sleeve for protection is of an adhesive type. The core wire insulating sleeve is a white flame-retardant plastic sleeve or a transparent heat-shrinkable sleeve.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A three-section electric connector with multiple core wires is characterized in that: the plug comprises a plug section (100), a connecting section (200) and a tail clamp section (300) which are sequentially arranged along the axial direction, wherein the plug section (100) is in threaded connection with the connecting section (200), and the connecting section (200) is in threaded connection with the tail clamp section (300); the plug section (100) comprises a plug section body (110) and a plug locking ring (120), the plug locking ring (120) is sleeved on the outer peripheral surface of the plug section body (110), and one end, close to the connecting section (200), of the plug section body (110) is provided with a plurality of welding pins (130); one end, far away from the connecting section (200), of the tail clamping section (300) is provided with a clamping portion, the clamping portion comprises a clamping screw (311) and at least two arc-shaped clamping pieces (312), and the at least two clamping pieces (312) are connected end to end through the clamping screw (311); the one end that tail clamp section (300) are close to linkage segment (200) is provided with clamping ring (320), clamping ring (320) include elastic ring (321), and at least some radial inside of this elastic ring (321) is protruding, forms annular extrusion portion (322).

2. The multi-strand, core-wire three-piece electrical connector of claim 1, wherein: the clamping ring (320) further comprises a metal ring (323).

3. The multi-strand, core-wire three-piece electrical connector of claim 1, wherein: the tail clamping section (300) comprises a tail clamping part body (330), an annular groove (331) is formed in the inner surface of the tail clamping part body (330), and the clamping ring (320) is located in the annular groove (331).

4. The multi-strand, three-piece electrical connector as claimed in claim 1 or 2, wherein: an abutting assembly (400) is arranged in the connecting section (200), the abutting assembly (400) comprises a first annular abutting portion (410) and a second annular abutting portion (420), a first abutting surface (411) is arranged on the first annular abutting portion (410), and a second abutting surface (421) in abutting fit with the first abutting surface (411) is arranged on the second annular abutting portion (420).

5. The multi-strand, core-wire three-piece electrical connector of claim 4, wherein: the clamping ring (320) is located between the second annular abutting portion (420) and the tail clamping section body (330), and two end faces of the clamping ring (320) are abutted to the second annular abutting portion (420) and the tail clamping section body (330) respectively.

6. The multi-strand, core-wire three-piece electrical connector of claim 5, wherein: a bushing (430) is connected in the connecting section (200), and the bushing (430) extends from one end of the connecting section (200) close to the plug section (100) to one end of the tail clamp section (300).

7. The multi-strand, core-wire three-piece electrical connector of claim 6, wherein: the first annular abutting portion (410) is connected to one end, away from the plug section (100), of the bushing (430).

8. A method of connecting a multi-strand three-segment electrical connector as claimed in claim 1, wherein: the method sequentially comprises the following steps:

s1, cutting off the cable insulation sheath (620) of the cable (600) by 2cm to 3cm, straightening the core wire (610) of the cable (600), and stripping off the insulation layer on the core wire (610) by 3-4 mm; sealing the end part of the residual cable insulating sheath (620) on the cable (600) by using an electric adhesive tape to form a protective adhesive tape layer (660);

s2, pre-sheathing an insulating sleeve (630) on the core wire (610) and pre-sheathing a protective insulating heat-shrinkable sleeve (640) on the cable (600) before the core wire (610) is welded with the welding needle (130); welding the core wire (610) with the welding needle (130); after the core wire (610) is welded with the welding needle (130), the exposed core wire (610) and the welding needle (130) are wrapped by the insulating sleeve (630);

s3, leading out a grounding wire (670) on the shielding layer of the cable (600);

s4, connecting the protective insulating heat-shrinkable sleeve (640) into the connecting section (200) after heat shrinkage, fixing the protective insulating heat-shrinkable sleeve (640) by using the clamping part (310), partially exposing the protective insulating heat-shrinkable sleeve (640) out of the tail clamping section (300), and grounding the grounding wire (670).

9. The method of claim 8, wherein the method comprises the steps of: in the step S1, a cold stripping process is adopted to perform insulation removal on the core wire (110); and stranding a plurality of strands of the core wires (110) subjected to insulation removal according to the original stranding direction, and carrying out tin coating treatment on the stranded core wires (110).