CN111403115B

CN111403115B - Production process of amplitude-stabilized and phase-stabilized cable

Info

Publication number: CN111403115B
Application number: CN202010262680.XA
Authority: CN
Inventors: 李同福; 李军民; 方扬刚; 杨贺林; 毛磊
Original assignee: Chuzhou Runhan Microwave Technology Co ltd
Current assignee: Chuzhou Runhan Microwave Technology Co ltd
Priority date: 2020-04-07
Filing date: 2020-04-07
Publication date: 2021-08-10
Anticipated expiration: 2040-04-07
Also published as: CN111403115A

Abstract

The invention discloses a production process of a stable-amplitude and stable-phase cable, which comprises the following steps: a low-density polytetrafluoroethylene taped wrapping process is adopted on the central conductor to serve as an insulating medium layer of the cable; the method is characterized in that a silver tape wrapping process is carried out on a medium layer after high-temperature shaping, an inner layer shield of a cable is formed, a silver-plated copper wire weaving process is carried out on the inner layer shield to serve as a protective layer of an outer shielding layer and the cable, then the protective layer is extruded through high-temperature fluoroplastics to form an environment-resistant protective layer of the cable, the medium layer needs to be subjected to high-low temperature cold and hot treatment, the cable subjected to the high-low temperature cold and hot treatment is subjected to plasma spray treatment in advance during next-process silver-plated copper tape wrapping production, on the basis that the original stable-amplitude and phase cable structure is not changed, the coefficient of expansion and contraction of the cable is close when a sheath is extruded at high temperature through the control of the production process, the gap between a second medium layer and a third inner layer shield is reduced, and therefore the phase stability performance is improved.

Description

Production process of amplitude-stabilized and phase-stabilized cable

Technical Field

The invention relates to the technical field of cable production and manufacturing, in particular to a production process of a stable-amplitude and stable-phase cable.

Background

The current amplitude and phase stabilizing cable has the following structure: the cable comprises a silver-plated copper central conductor, a polytetrafluoroethylene lapping medium layer, a silver-plated copper strip lapping inner layer shield, a silver-plated copper wire weaving outer layer shield layer and a high-temperature extrusion sheath layer.

The central conductor is used as an insulating medium layer of the cable by adopting a low-density polytetrafluoroethylene tape wrapping process, and the medium layer needs to be subjected to high-temperature heat setting to prevent the medium layer from loosening; carrying out a silver tape wrapping process on the high-temperature shaped dielectric layer to form an inner layer shield of the cable, carrying out a silver-plated copper wire weaving process on the inner layer shield to serve as an outer shield layer and a protective layer of the cable, and then extruding the outer shield layer and the protective layer through high-temperature fluoroplastic to form an environment-resistant protective layer of the cable; the process mode is the main amplitude-stabilizing phase-stabilizing cable production process at present.

The amplitude-stabilizing performance of the amplitude-stabilizing phase produced by the process often does not reach the standard, the service life of the cable and the signal transmission quality are often reduced through the amplitude-stabilizing performance of +/-0.2 dB-0.5 dB and the mechanical phase-stabilizing performance of +/-5 degrees- +/-7 degrees, so that the quality problems of signal transmission error codes and the like are caused, and the cable far from meeting the actual use requirements of customers can not meet the requirements of the customers, so that the finished product rate is low, the selling price is high, the delivery delay is delayed and the like.

The main reason for the substandard amplitude stability of the cable is that the expansion coefficient and the contraction coefficient of the polytetrafluoroethylene tape are different from those of the silver-plated copper material used for the cable, the expansion coefficient and the contraction coefficient of the polytetrafluoroethylene are (1.09 x 10 > (4) -2.165 x 10 (4)) m/DEG C, and the expansion coefficient and the contraction coefficient of the copper are 17.7 x 10 (6) m/DEG C, which results in a tiny gap between the second dielectric layer and the third inner shield layer when the sheath is extruded (400 ℃) and after the sheath is extruded (normal temperature), so that the cable has unstable electromagnetic wave type and large insertion loss in the use process of bending, shaking and the like, i.e. the amplitude stability is poor.

Disclosure of Invention

In order to overcome the defects, the invention provides a production process of an amplitude-stabilized phase-stabilized cable, which is characterized in that on the basis of not changing the structure of the original amplitude-stabilized phase-stabilized cable, the expansion coefficient and the contraction coefficient of the cable are close when a sheath is extruded at high temperature through the control of the production process, and the gap between the second medium layer and the third inner layer shield is reduced, so that the phase stabilization performance is improved.

The technical scheme adopted by the invention for solving the technical problem is as follows: a production process of a stable-amplitude and stable-phase cable mainly comprises a silver-plated copper central conductor, a polytetrafluoroethylene wrapped dielectric layer, a silver-plated copper strip wrapped inner layer shield, a silver-plated copper wire braided outer layer shield layer and a high-temperature extrusion sheath layer from inside to outside, and comprises the following steps: a low-density polytetrafluoroethylene taped wrapping process is adopted on the central conductor to serve as an insulating medium layer of the cable; carrying out a silver tape wrapping process on the medium layer shaped at high temperature to form an inner layer shield of the cable, carrying out a silver-plated copper wire weaving process on the inner layer shield to serve as an outer shield layer and a protective layer of the cable, then extruding the protective layer through high-temperature fluoroplastic to form an environment-resistant protective layer of the cable, wherein the medium layer needs to be subjected to high-low temperature cold and hot treatment, the cable subjected to the high-low temperature cold and hot treatment is subjected to plasma spray treatment in advance during the next process of silver-plated copper strip wrapping production, the friction coefficient of the surface of the polytetrafluoroethylene medium layer and the silver-plated copper strip is increased through the plasma spray treatment, and the gap change between the second medium layer and the third shield layer caused by bending jitter of the cable during use is reduced; thereby greatly improving the amplitude stability of the cable. The amplitude stability performance of the cable produced by the process can reach +/-0.03 to +/-0.05 dB through multi-batch tests, so that the service life of the cable is indirectly prolonged, and the later maintenance cost of the cable is reduced.

As a further improvement of the invention, the specific steps of the dielectric layer needing high-low temperature cold and hot treatment are as follows:

1) and (3) insulating the medium wrapped by the polytetrafluoroethylene for 1 hour at a low temperature of-55 ℃.

2) And quickly transferring the cable subjected to low-temperature treatment to a high-temperature box with a high temperature of 165 ℃ for heat preservation for 1 hour.

3) Repeating the steps 1) and 2) for 3 cycles.

The process aims to fully release the processing stress of the cable through high-temperature and low-temperature cold-heat alternation, so that the cable has small deformation during high-temperature extrusion at the later stage. Therefore, the interior of the dielectric layer is compact, the deformation of the dielectric layer is small when the cable is bent and shaken, the mechanical phase stability of the cable processed by the process can reach +/-1 degrees to +/-2 degrees through testing, and the mechanical phase stability of the cable is greatly improved.

The invention has the beneficial effects that: compared with the prior art, the invention has the following advantages:

1. the original cable structure is not changed;

2. the high-low temperature cold and hot treatment releases the stress of the cable in advance, and reduces the later shrinkage degree;

3. the plasma spray process promotes friction between the second and third layers of the cable.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a process flow diagram of the present invention.

FIG. 3 is the amplitude and phase stability test data of the cable produced by the original process;

FIG. 4 shows the test data of the amplitude and phase stability of the cable produced by the process of the present invention

The following are marked in the figure: 1-a silver-plated copper central conductor, 2-a polytetrafluoroethylene lapping medium layer, 3-a silver-plated copper strip lapping inner layer shield and 4-a silver-plated copper wire weaving outer layer shield; 5-high temperature extrusion of the sheath layer.

Detailed Description

For the purpose of enhancing the understanding of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.

Example (b): a production process of a stable-amplitude and stable-phase cable mainly comprises a silver-plated copper central conductor, a polytetrafluoroethylene wrapped dielectric layer, a silver-plated copper strip wrapped inner layer shield, a silver-plated copper wire braided outer layer shield layer and a high-temperature extrusion sheath layer from inside to outside, and comprises the following steps: a low-density polytetrafluoroethylene taped wrapping process is adopted on the central conductor to serve as an insulating medium layer of the cable; carry out silver-colored area on the dielectric layer after the high temperature is stereotyped around package technology, form the inlayer shielding of cable, carry out silver-plated copper wire weaving technology on the inlayer shielding, as the protective layer of outer shielding layer and cable, then extrude through high temperature fluoroplastics, form the resistant environmental protection layer of cable, its characterized in that: the medium layer needs to be subjected to high-low temperature cold-hot treatment, and the cable subjected to the high-low temperature cold-hot treatment is subjected to plasma spray treatment in advance during the winding production of the silver-plated copper strip in the next procedure, so that the friction coefficient between the surface of the polytetrafluoroethylene medium layer and the silver-plated copper strip is increased through the plasma spray treatment, and the gap change between the second medium layer and the third shielding layer caused by bending and shaking of the cable in use is reduced; thereby greatly improving the amplitude stability of the cable. The amplitude stability performance of the cable produced by the process can reach +/-0.03 to +/-0.05 dB through multi-batch tests, so that the service life of the cable is indirectly prolonged, and the later maintenance cost of the cable is reduced.

The specific steps of the dielectric layer needing high-low temperature cold and hot treatment are as follows:

3) Repeating the steps 1) and 2) for 3 cycles.

In the above embodiment, the comparison data of the amplitude and phase stability performance test of the existing cable and the new process are as follows:

1. FIG. 3 shows the amplitude and phase stability test data of the cable produced by the original process;

2. fig. 4 shows the amplitude and phase stability test data of the cable produced by the new process.

Claims

1. The utility model provides a steady looks cable production technology of steady width of cloth, the cable is from interior to exterior silver-plated copper central conductor, polytetrafluoroethylene around package dielectric layer, silver-plated copper strips around package inlayer shielding, silver-plated copper wire weave outer shielding layer and high temperature extrude the restrictive coating and constitute, its characterized in that: the production process comprises the following steps: a low-density polytetrafluoroethylene taped wrapping process is adopted on the central conductor to serve as an insulating medium layer of the cable; sequentially carrying out high-temperature and low-temperature cold and hot treatment on the dielectric layer and using plasma spraying treatment in advance; then carrying out a silver-plated copper strip wrapping process on the dielectric layer to form an inner layer shield of the cable, carrying out a silver-plated copper strip weaving process on the inner layer shield to serve as an outer shield layer and a protective layer of the cable, then extruding the outer shield layer and the protective layer through high-temperature fluoroplastic to form an environment-resistant protective layer of the cable,

1) insulating the medium wrapped by polytetrafluoroethylene for 1 hour at-55 ℃ in a low-temperature box;

2) rapidly transferring the cable subjected to low-temperature treatment to a high-temperature box with a high temperature of 165 ℃ and preserving heat for 1 hour;

3) repeating the steps 1) and 2) for 3 cycles.