CN110649430A

CN110649430A - Grounding processing method for cable shield with shielding net and YMD electric connector

Info

Publication number: CN110649430A
Application number: CN201910839479.0A
Authority: CN
Inventors: 李江立
Original assignee: Beijing Institute of Electronic System Engineering
Current assignee: Beijing Institute of Electronic System Engineering
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2020-01-03
Anticipated expiration: 2039-09-06
Also published as: CN110649430B

Abstract

The invention discloses a method for grounding a cable shield with a shielding net and a YMD electric connector, which is used for solving the grounding problem of the cable shield with the shielding net. The invention firstly draws 5 to 8 shielding wires out of the shielding layer to be welded to the grounding wire, and the circular wiring terminal is welded and fixed to the tail clamp after the grounding wire is led out. And then after 5 to 8 shielding wires are drawn out of the shielding layer, the rest cable shielding layer is directly pressed between the shielding ring and the bushing for shielding treatment. The welding method solves the problem that the resistance value of the grounding resistance measured by the shielding layer of the cable with the shielding net is not more than 10 milliohms, can completely ensure that the resistance value of the grounding resistance measured is not more than 10 milliohms, and solves the grounding problem of the cable with the shielding net and the YMD electric connector.

Description

Grounding processing method for cable shield with shielding net and YMD electric connector

Technical Field

The invention relates to the technical field of cable shielding, in particular to a method for grounding a cable shield with a shielding net and a YMD electric connector.

Background

The cable shielding layer is formed by overlapping and wrapping tinned soft copper wires, and the surface of the cable shielding layer is tightened by reversely wrapped copper wires. The cable shielding layer is mainly used for preventing electromagnetic interference between each wire core in the cable or between the cable and leading current into the grounding pile through grounding connection according to the conductivity of copper wires.

The full name of YMD electric connector: YMD-YMD series marine corrosion-resistant waterproof high-current electric connector. Overview of YMD electrical connectors: 1) the YMD electric connector is provided with three-head thread anti-loose quick connection; 2) the cable is suitable for electrical connection between equipment and cables and between cables in severe environments such as moist environment, water immersion environment and the like; 3) can resist the water depth of 50 meters for sealing; 4) the device is suitable for large-current transmission; 5) the termination modes of the plug and the socket of the YMD electric connector are welding; 6) the five-key positioning has the functions of blind insertion and error insertion prevention; 7) the high-reliability crown hole enables the connector to be inserted and pulled flexibly and has small release resistance; 8) the plug and the socket can be provided with the pin and the hole.

The YMD electric connector comprises an electric connector, a transfer sleeve, a lining, a middle nut, a sleeve, a shielding ring, a gasket, a rubber ring, a gasket, a pressing ring and a pressing nut. The shielding layer is connected into the YMD electric connector to form signal connection of the shielding layer to the cable and grounding connection of the cable.

According to GJB 6850.20-2009, surface vessel mooring voyage test protocol part 20: naval missile weapon system experiments, section 6.2.4: the grounding condition of each device and cable in the system is checked, good contact is ensured, anti-loosening and anti-corrosion measures are taken, and the grounding resistance is checked and is not more than 10 milliohms.

The method for grounding the shielding layer of the cable with the shielding net and the YMD electric connector, which is commonly used at present, is that the shielding net of the cable is directly pressed between the shielding ring and the bushing, and when a cable assembly assembled by the method is used for grounding resistance test, the result can not be completely guaranteed to be not more than 10 milliohms. And according to the GJB 6850.20-2009 section 20 of the surface vessel mooring voyage test protocol: ship-air missile weapon system experiments, the resistance value of the grounding resistance of a system cable is not more than 10 milliohms.

Disclosure of Invention

In order to solve the problem that the resistance value of the grounding resistor of the shielding layer of the cable with the shielding net and the YMD electric connector is not more than 10 milliohms, a process method is improved, and the resistance value of the grounding resistor is not more than 10 milliohms. The invention aims to provide a method for processing the grounding of a shielding and YMD electric connector with a shielding net cable, which ensures that the measured grounding resistance value of the shielding net is not more than 10 milliohms.

To this end, the invention provides a cable shield with shielding net and YMD electric connector grounding processing method, which is characterized by comprising the following steps: the first step is as follows: after the welding of the cable core wire and the electric connector is finished, performing thermal shrinkage protection on the processed welding spot by using a thermal shrinkage sleeve; the second step is that: the bushing is pushed forward and abuts against the end teeth of the upper coupling sleeve. Processing the surface oxide film of the shielding net, extracting a plurality of shielding wires from the shielding net and welding the shielding wires to the grounding wire; covering the rest shielding net on the outer ring groove of the bushing, tightly binding the shielding net in the ring groove of the bushing by using cotton threads, dispensing the binding positions of the cotton threads, and cutting off the overlong shielding net; the third step: after the shielding wire leads out the grounding wire, an arc with a specified arc length is left to expose the tail clamp, redundant leading-out wires are cut off, a black heat-shrinkable sleeve is pre-sleeved, a circular wiring terminal is welded, and an insulated welding end of the heat-shrinkable sleeve is sleeved and installed on a locking screw of the tail clamp of the electric connector; the fourth step: pushing the middle nut and the sleeve forwards, installing the bushing into the sleeve, aligning a riveting key of the bushing with a groove of the sleeve, screwing the middle nut on the adapter sleeve, and screwing a set screw; the fifth step: the shielding ring, the gasket, the rubber ring, the gasket and the pressing ring are sequentially pushed into the sleeve, and the adhesive tape is wound at the locking position of the corresponding rubber ring and the pressing ring to adjust the diameter of the cable, so that the locking is firm after assembly is ensured; and a sixth step: installing a compression nut; the seventh step: and a pressing plate, a screw and a screw spring washer are arranged on the compression nut, and the screw is screwed to clamp the cable.

Wherein 5 to 8 shield wires drawn out from the shield mesh are soldered to the ground wire.

In the first step, the glue is Q98-1 glue.

And in the third step, an arc with the arc length of 25mm and exposing the tail clamp is reserved.

Advantageous effects

According to the invention, 5-8 shielding wires are extracted from a shielding layer and welded to a grounding wire, and a circular wiring terminal is welded and fixed to a tail clamp after the grounding wire is extracted; after the shielding layer is drawn out of 5 to 8 shielding wires, the rest cable shielding layer is directly pressed between the shielding ring and the bushing. The welding method solves the problem that the resistance value of the grounding resistance measured by the shielding layer of the cable with the shielding net is not more than 10 milliohms, can completely ensure that the resistance value of the grounding resistance measured is not more than 10 milliohms, and solves the grounding problem of the cable with the shielding net and the YMD electric connector.

Drawings

Fig. 1 is a view of a YMD electrical connector shield mesh mounting solder structure.

Fig. 2 is an appearance effect diagram of the YMD electrical connector.

1 adapter sleeve 2 first set screw 13 middle nut 4 second set screw 2

5 bushing 6 shield ring 7 sleeve 8 washer

9 rubber ring, 10 washer, 11 pressing ring and 12 pressing nut

13 fastening screw 14 round terminal 15 cable shielding layer 16 grounding wire

21 cable 22 ground wire 23 round terminal 24 tail clamp 25 clamp plate 26 screw spring washer

Detailed description of the preferred embodiment

The following detailed description of embodiments of the invention refers to the accompanying drawings.

The invention discloses a method for grounding a cable shield with a shielding net and a YMD electric connector, which is used for solving the grounding problem of the cable shield with the shielding net.

The invention firstly draws 5 to 8 shielding wires out of the shielding layer to be welded to the grounding wire, and the circular wiring terminal is welded and fixed to the tail clamp after the grounding wire is led out. And then after 5 to 8 shielding wires are drawn out of the shielding layer, the rest cable shielding layer is directly pressed between the shielding ring and the bushing for shielding treatment.

Specifically, the grounding processing method of the cable shield with the shielding net and the YMD electric connector provided by the invention comprises the following specific steps:

the first step is as follows: and after the welding of the cable core wire and the electric connector is finished, performing thermal shrinkage protection on the welding spot between the processed cable core wire and the electric connector by using a thermal shrinkage sleeve.

The second step is that: the bushing 5 is pushed forward against the upper coupling sleeve end tooth. And (3) processing the surface oxide film of the cable shielding net, and extracting 5 to 8 shielding wires from the cable shielding net to be welded on the grounding wire. Covering the rest shielding net on the outer ring groove of the bushing, tightly binding the shielding net in the ring groove of the bushing by using cotton threads, gluing a binding point Q98-1 of the cotton threads, and cutting off the overlong shielding net, wherein the figure is shown in figure 1.

The third step: after the grounding wire is led out in a shielding mode, as shown in fig. 2, an arc with the length of the exposed tail clamp being about 25mm is reserved, redundant leading-out wires are cut off, a black heat-shrinkable sleeve is sleeved in advance, a circular wiring terminal is welded, an insulating welding end of the heat-shrinkable sleeve is sleeved, and the tail clamp is installed on a tail clamp locking screw of an electric connector shown in fig. 2.

The fourth step: the middle nut 3 and the sleeve 7 are pushed forwards, the bush 5 is arranged in the sleeve 7, the riveting key of the bush 5 is aligned with the groove of the sleeve 7, the middle nut 3 is screwed on the adapter sleeve 1, and the set screw 2 is screwed.

The fifth step: the shielding ring 6, the gasket 10, the rubber ring 9, the gasket 10 and the pressing ring 11 are sequentially pushed into the sleeve, and the electrician adhesive tape is wound at the locking position corresponding to the rubber ring 9 and the pressing ring 11 so as to adjust the diameter of the cable and ensure firm locking after assembly.

And a sixth step: and a compression nut 12 is arranged at the tail part of the tail cover of the YMD plug.

The seventh step: a pressure plate 25, a screw and a screw spring washer 26 are arranged on the compression nut 12, and the screw is tightened to clamp the cable.

And after the grounding treatment of the shielding layer of the cable with the shielding net and the YMD electric connector is finished, the grounding resistance test is carried out, and the test result shows that the resistance value of the grounding resistance is not more than 10 milliohms.

The welding method solves the problem that the resistance value of the grounding resistance measured by the shielding layer of the cable with the shielding net is not more than 10 milliohms, can completely ensure that the resistance value of the grounding resistance measured is not more than 10 milliohms, and solves the grounding problem of the cable with the shielding net and the YMD electric connector.

Claims

1. A cable shield with a shielding net and YMD electric connector grounding processing method is characterized by comprising the following steps:

the first step is as follows: after the welding of the cable core wire and the electric connector is finished, performing thermal shrinkage protection on a welding spot between the processed cable core wire and the electric connector by using a thermal shrinkage sleeve;

the second step is that: the bushing (5) is pushed forward and abuts against the end teeth of the upper coupling sleeve. Processing the surface oxide film of the cable shielding net, and extracting a plurality of shielding wires from the cable shielding net to be welded on a grounding wire; covering the rest shielding net on the outer ring groove of the bushing, tightly binding the shielding net in the ring groove of the bushing by using cotton threads, dispensing the binding positions of the cotton threads, and cutting off the overlong shielding net;

the third step: after the shielding wire leads out the grounding wire, an arc with a specified arc length is left to expose the tail clamp, redundant leading-out wires are cut off, a black heat-shrinkable sleeve is pre-sleeved, a circular wiring terminal is welded, and an insulated welding end of the heat-shrinkable sleeve is sleeved and installed on a locking screw of the tail clamp of the electric connector;

the fourth step: the middle nut (3) and the sleeve (7) are pushed forwards, the bushing (5) is installed in the sleeve (7), the riveting key of the bushing (5) is aligned with the groove of the sleeve (7), the middle nut (3) is screwed on the adapter sleeve (1), and the set screw (2) is screwed;

the fifth step: the shielding ring (6), the gasket (10), the rubber ring (9), the gasket (10) and the pressing ring (11) are sequentially pushed into the sleeve, and an insulating adhesive tape is wound at the locking position corresponding to the rubber ring (9) and the pressing ring (11) to adjust the diameter of the cable, so that the cable is firmly locked after assembly;

and a sixth step: a compression nut (12) is arranged at the tail part of the tail cover of the YMD plug;

the seventh step: a pressing plate (25), a screw and a screw spring washer (26) are arranged on the compression nut (12), and the screw is tightened to clamp the cable.

2. A method according to claim 1, characterized in that in the first step 5 to 8 shield wires are drawn from the cable screen and soldered to the earth wire.

3. The method of claim 1, wherein in the first step, the dispensing is performed using a Q98-1 glue.

4. The method of claim 1, wherein in the third step, an arc of 25mm length is left exposing the tail clip.