CN114527051A - Waterproof performance detection method and application of optical cable - Google Patents
Waterproof performance detection method and application of optical cable Download PDFInfo
- Publication number
- CN114527051A CN114527051A CN202210137745.7A CN202210137745A CN114527051A CN 114527051 A CN114527051 A CN 114527051A CN 202210137745 A CN202210137745 A CN 202210137745A CN 114527051 A CN114527051 A CN 114527051A
- Authority
- CN
- China
- Prior art keywords
- cable
- shrinkable tube
- heat
- test
- heat shrinkable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 39
- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 238000012360 testing method Methods 0.000 claims abstract description 140
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 43
- 239000007788 liquid Substances 0.000 claims description 22
- 238000011056 performance test Methods 0.000 claims description 18
- 239000004831 Hot glue Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 8
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 4
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 4
- 229920000098 polyolefin Polymers 0.000 claims description 4
- 238000000576 coating method Methods 0.000 abstract description 15
- 239000011248 coating agent Substances 0.000 abstract description 14
- 239000010410 layer Substances 0.000 description 13
- 230000006872 improvement Effects 0.000 description 12
- 230000003014 reinforcing effect Effects 0.000 description 5
- 230000036964 tight binding Effects 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
Abstract
The invention discloses a waterproof performance detection method of an optical cable and application thereof, belonging to the technical field of cable detection and comprising the following steps: cutting a section of test cable from the semi-finished cable production line before the optical cable is sleeved with the outer sheath; sleeving a heat shrink tube outside the test cable, and heating the heat shrink tube to enable the heat shrink tube to be tightly sleeved on the periphery of the test cable; testing the waterproof performance of the test cable wrapped with the heat shrinkable tube, and if the waterproof performance is qualified, testing the waterproof performance of the cable to be tested to be qualified; and if the waterproof performance is unqualified, the waterproof performance of the cable to be detected is unqualified. According to the method for detecting the waterproof performance of the optical cable, the outer sheath is replaced by the heat shrinkable tube for waterproof testing, on the premise that the accuracy of waterproof performance testing is ensured, the coating time of the outer sheath on the testing cable is greatly reduced, the waterproof performance result of the cable can be quickly detected, the overall detection method is simple, the operation is convenient, and the waterproof performance detection efficiency of the cable can be greatly improved.
Description
Technical Field
The invention belongs to the technical field of cable detection, and particularly relates to a method for detecting the waterproof performance of an optical cable and application thereof.
Background
The signal transmission main body in the cable is a cable core, the oxidation of the cable core can be accelerated after water enters the cable, the service life of the cable is shortened, the insulating property of the cable can be influenced after the water enters the cable, and the problem of signal transmission interruption is easily caused. Therefore, most communication optical fibers need to arrange water-blocking yarns between the cable core and the outer sheath structure or add water-blocking fiber paste and the like.
The water seepage detection test of the cable is an important process of the factory detection of the cable, the water seepage performance of the cable is an important control index for evaluating the quality of the cable, and the quality of the water seepage performance directly influences the service life of the cable and the line safety of the cable.
When the water seepage performance of the existing cable is detected, the existing cable is often required to be produced into a finished product, namely the water seepage performance is detected after the outer sheath is sleeved on the inner cable, but the increase of the outer sheath on the inner cable is usually required to be more than 3 hours, if the water seepage performance of the cable is tested to be unqualified, the water seepage performance of the whole cable is unqualified, the extrusion molding time of the outer sheath per se is wasted, and a large amount of outer sheath materials are wasted.
Disclosure of Invention
In view of one or more of the above defects or needs for improvement in the prior art, the present invention provides a method for detecting a waterproof property of an optical cable, so as to solve the problem that a large amount of sheath material and sheath extrusion time are wasted due to a failed water seepage test of an existing cable.
In order to achieve the above object, the present invention provides a method for detecting waterproof performance of an optical cable, which comprises the following steps:
cutting a section of test cable from the semi-finished cable production line before the finished cable is sheathed with the outer sheath;
sleeving a heat shrink tube outside the test cable, and heating the heat shrink tube to enable the heat shrink tube to be tightly sleeved on the periphery of the test cable;
testing the waterproof performance of the test cable wrapped with the heat shrinkable tube, and if the waterproof performance is qualified, testing the waterproof performance of the cable to be tested to be qualified; and if the waterproof performance is unqualified, the waterproof performance of the cable to be detected is unqualified.
As a further improvement of the invention, the waterproof performance test comprises a water seepage performance test, and the steps are as follows:
and arranging an indicating liquid column with a preset height at one end of the test cable, connecting one end of the test cable coated with the heat shrinkable tube with the bottom of the indicating liquid column, and observing whether the indicating liquid seeps out from the other end of the test cable in a preset time.
As a further development of the invention, the end of the test cable is subjected to a pressure of 9.8 x 103Pa。
As a further improvement of the invention, after the heat shrinkable tube heating jacket is arranged on the test cable, the pulling-out force between 100mm of the heat shrinkable tube and 100mm of the test cable is not less than 50N.
As a further improvement of the invention, the waterproof performance test comprises a coating performance test, and the steps are as follows:
reserving a heat shrinkable tube for clamping at one end of the test cable, clamping the heat shrinkable tube at one end, clamping the cable at the other end, separating the test cable from the heat shrinkable tube along the extension direction of the test cable, and measuring the pull-out force F of the test cable and the heat shrinkable tube1；
If the pull-out force F between the cable and the heat shrinkable tube is tested1If the temperature is more than or equal to 50N, the problem of water seepage between the test cable and the heat shrinkable tube does not exist, and the test cable coated with the heat shrinkable tube is subjected to a water seepage performance test;
if the pull-out force F between the cable and the heat shrinkable tube is tested1If the number of the test cables is less than 50N, a gap exists between the test cables and the heat shrink tube, the heat shrink tube is separated from the test cables, and the test cables are subjected to water seepage performance test after being coated with the heat shrink tube for the second time.
As a further improvement of the invention, the step of arranging the heat shrink tube on the test cable jacket comprises the following steps:
and selecting a heat-shrinkable tube, sleeving the heat-shrinkable tube on the periphery of the test cable, and heating the outer surface of the heat-shrinkable tube by using a hot air gun so that the heat-shrinkable tube is tightly sleeved on the periphery of the test cable.
As a further improvement of the present invention, the heat shrinkage tube is heated by the heat gun in a manner that: placing the test cable sleeved with the heat shrinkable tube on a plane, enabling a gun head of the hot air gun to face the surface of the heat shrinkable tube, starting the hot air gun, and moving the hot air gun along the extension direction of the test cable so that the hot air gun heats one side facing the heat shrinkable tube;
the test cable with the heat shrinkable tube is turned over on the plane by 180 degrees, the gun head of the heat gun faces the surface of the heat shrinkable tube, and the heat gun moves along the extending direction of the cable, so that the heat gun heats the other side of the heat shrinkable tube.
As a further improvement of the invention, the distance between the gun head of the hot air gun and the outer surface of the heat shrinkable tube is 10-30 mm;
the moving speed of the hot air gun along the extension direction of the test cable is 30-50 mm/s;
the heating temperature of the hot air gun to the surface of the heat shrinkable tube is 70-125 ℃.
As a further improvement, the inner diameter of the heat shrinkable tube is adaptive to the outer diameter of the cable to be detected, and the inner diameter of the heat shrinkable tube is 4-5 mm larger than the outer diameter of the cable to be detected.
As a further improvement of the present invention, the relationship between the inner diameter a of the heat shrinkable tube, the diameter B of the test cable, the diameter C of the test cable sheathed with the heat shrinkable tube, and the wall thickness D of the heat shrinkable tube wall is as follows:
B+5mm≤A≤2B；
C-B≤2D。
as a further improvement of the invention, the heat shrinkable tube is a polyolefin heat shrinkable sleeve which is of a double-layer structure, wherein the outer layer is made of a crosslinked polyethylene material, and the inner layer is made of a hot melt adhesive. .
As a further improvement of the invention, the waterproof performance detection method of the optical cable is applied to waterproof detection of the ribbon cable.
The above-described improved technical features may be combined with each other as long as they do not conflict with each other.
Generally, compared with the prior art, the technical scheme conceived by the invention has the following beneficial effects:
(1) according to the method for detecting the waterproof performance of the optical cable, the outer sheath is replaced by the heat-shrinkable tube, the semi-finished cable is quickly coated by the heat-shrinkable tube and subjected to a waterproof test, the quick waterproof test of the semi-finished cable is realized, and the cable is coated by the outer sheath after the waterproof test of the semi-finished cable is qualified, so that the problems that the waterproof performance of the cable is unqualified after the outer sheath is coated, a large amount of outer sheath coating time is wasted, the material loss of the outer sheath is caused and the like are solved.
(2) According to the method for detecting the waterproof performance of the optical cable, the heating mode and the heating condition of the heat shrinkage pipe by the hot air gun are strictly limited, so that the heat shrinkage pipe and the cable are perfectly coated, the coating tight binding degree of the heat shrinkage pipe to the cable is ensured, the outer sheath loss caused by overhigh heating temperature of the hot air gun is avoided, the waterproof performance of the cable can be accurately obtained in a water seepage test, and the problem of unqualified water seepage caused by a gap between the heat shrinkage pipe and the cable is avoided.
(3) According to the method for detecting the waterproof performance of the optical cable, disclosed by the invention, the coating force between the heat shrinkable tube and the test cable is tested and compared with the coating force between the outer sheath and the cable, and on the premise that the coating force between the outer sheath and the cable is greater than the coating force between the heat shrinkable tube and the test cable, if the water seepage performance test between the heat shrinkable tube and the test cable is qualified, the water seepage performance test between the outer sheath and the cable is deduced to be qualified, and the waterproof performance between the outer sheath and the cable is deduced according to the ratio, so that the waterproof performance test speed of the cable is greatly accelerated, and meanwhile, the use of outer sheath materials is greatly reduced.
(4) According to the method for detecting the waterproof performance of the optical cable, the existing water seepage problem of the cable is mainly concentrated on water seepage inside the cable according to the water seepage test condition of the cable, the outer sheath is replaced by the heat shrinkable tube, the waterproof performance of the semi-finished cable is qualified under the condition that the waterproof test of the semi-finished cable is qualified after the heat shrinkable tube is coated, and then the semi-finished cable is coated by the outer sheath, so that the problem that the water seepage performance is unqualified after the outer sheath is coated is avoided, and the waterproof performance detection efficiency is greatly improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used merely for convenience in describing the invention and to simplify the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered as limiting.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The embodiment is as follows:
the semi-finished cable in the present invention refers to a cable portion of the optical cable excluding the outer jacket, and when the cable is a multi-layer jacket structure, the semi-finished cable refers to a cable portion not including the innermost jacket. Meanwhile, the test cable in the present invention also refers to a cable portion that does not include the outer jacket structure.
The method for detecting the waterproof performance of the optical cable in the preferred embodiment of the invention comprises the following steps: cutting a section of test cable from a semi-finished cable production line before the optical cable is sleeved with the outer sheath; sleeving a heat shrink tube outside the test cable, and heating the heat shrink tube to enable the heat shrink tube to be tightly sleeved on the periphery of the test cable; testing the waterproof performance of the test cable wrapped with the heat shrinkable tube, and if the waterproof performance is qualified, testing the waterproof performance of the cable to be tested to be qualified; and if the waterproof performance is unqualified, the waterproof performance of the cable to be detected is unqualified.
In the conventional optical cable waterproof performance test, the optical cable with the outer sheath is intercepted to carry out the waterproof test, and whether the waterproof performance of the optical cable is qualified or not is determined in a sampling inspection mode. Under the normal condition, the waterproof performance of the optical cable tested by spot check is qualified, and the waterproof performance of the optical cable in the whole batch reaches the standard; and if the waterproof performance of the optical cable tested by the spot check is unqualified, the waterproof performance of the optical cable of the whole batch is unqualified. This can result in the total waste of the entire internal semi-finished cable and the coated outer sheath in the event of a faulty spot check, and the outer sheath usually needs to be set over 3h outside the semi-finished cable, which can cause a great waste of cable waterproof test time.
In the long-term waterproof test process of the optical cable, the fact that the water seepage condition of the optical cable is mostly generated among the reinforcing core, the sleeve and the filling rope, the reinforcing core, the sleeve and the filling rope belong to semi-finished cable parts, the main reason is that gaps among the reinforcing core, the sleeve and the filling rope are large, the outer sheath is in close contact with the outer surface of the sleeve in the manufacturing process of the outer sheath, and the water seepage condition cannot occur between the outer sheath and the cable basically, so the waterproof test of the cable mainly solves the waterproof test among the reinforcing core, the sleeve and the filling rope in the semi-finished cable under the condition of certain fastening force.
Based on this, this application replaces the oversheath through adopting the pyrocondensation pipe, establishes the pyrocondensation pipe at cable surface cover and carries out waterproof test, and the oversheath possesses better tight binding power to the cable than the pyrocondensation pipe, and under the normal conditions, when the pull-out power between pyrocondensation pipe and the semi-manufactured goods cable is not less than 50N, and when the inside combination of semi-manufactured goods cable is inseparable, the inside infiltration problem that can not take place basically of semi-manufactured goods cable. Therefore, under the condition that the heat shrinkable tube is sleeved to achieve the standard of a waterproof test, the problem that the cable is not subjected to water seepage under the condition of wrapping the outer sheath can be solved. And the heat-shrinkable tube can be quickly sleeved on the outer surface of the cable only in a heating mode, so that the construction efficiency is high, and the waterproof test of the semi-finished cable can be quickly realized.
Further, as a preferred embodiment of the present invention, the waterproof performance test in the present application includes a water penetration performance test, which includes the following steps: and arranging an indicating liquid column with a preset height at one end of the test cable, connecting one end of the test cable coated with the heat shrinkable tube with the bottom of the indicating liquid column, and observing whether the indicating liquid seeps out from the other end of the test cable in a preset time. When the cable coated with the heat shrinkable tube is subjected to a waterproof test, the height of a liquid column at the end face of the cable is h, which is the height of the liquid columnApplying pressure p to the end face of the cable, wherein p is pressure in Pa; ρ is the liquid density in units of: kg/m 3; g is the acceleration of gravity and is 9.8N/kg; h is the height of the liquid column, the unit is m, when the height of the standard liquid column is 1m and the test is carried out by adopting tap water, the pressure on the end face is 9.8 x 103Pa。
Preferably, the indicator liquid selected in the indicator liquid column is tap water, and in order to facilitate observation of water seepage of the end face during water seepage, test paper can be placed at one end of the cable far away from the indicator liquid column, so that rapid absorption change of the test paper can be realized after liquid seeps out, or color ink or a fluorescent marker and the like are added into the indicator liquid, so that the other end face of the cable can rapidly show after water seepage, and observation of a tester is facilitated.
Preferably, in order to ensure the accuracy of the water seepage test, the selected test cable length and the selected test liquid column are standard test values, according to the YD/T901 standard, in the waterproof test standard of the cable, the test cable length is usually 3m, the height of the indication liquid column is usually 1m, and the test time is usually 24 h. Optionally, in the actual testing process, the customer standard is usually higher than the industry standard, the testing cable length may be other lengths less than 3m, such as 2m, 1m, etc., and the indication liquid column height and the testing time, etc. may be increased and increased according to the customer requirement.
Further, as a preferred embodiment of the present invention, the waterproof performance test in the present application includes a coating performance test, which includes the following steps: reserving a heat shrinkable tube for clamping at one end of the test cable, clamping the heat shrinkable tube at one end, clamping the cable at the other end, separating the test cable from the heat shrinkable tube along the extension direction of the test cable, and measuring the pull-out force F between the test cable and the heat shrinkable tube1(ii) a If F1If the thickness is more than or equal to 50N, the test cable and the heat shrink tube are tightly coated, and the water seepage situation cannot occur; if F1And if the number of the test cables is less than 50N, gaps exist between the test cables and the heat shrinkable tubes, water seepage is easy to occur between the test cables and the heat shrinkable tubes, and the surfaces of the test cables need to be sleeved with the heat shrinkable tubes for the second time. Used in the coating performance test and the water seepage testThe semi-finished cables are produced in the same batch by the same heat shrinkable tube coating process, so as to ensure the correlation of the two tests. Preferably, the sample of the cable core in the coating performance test has a length of 100mm, and the size of the inner semi-finished cable can be equal to or slightly longer than the length of the heat-shrinkable tube for clamping, and the length can be selected from 100mm, 120mm, 140mm, 160mm and the like.
When carrying out semi-manufactured goods cable waterproof performance and examining time measuring, in order to ensure semi-manufactured goods cable waterproof testing's accuracy degree, it still includes the test of the tight degree of binding of pyrocondensation pipe to the test cable cladding, through the pull-out power on inspection test cable and pyrocondensation pipe surface, ensures that the contact surface department between pyrocondensation pipe and the test cable can not take place the infiltration condition. The pull-out force F between the test cable and the heat shrink tube1Usually greater than 50N, and generally between 50N and 100N. And under the condition that the pulling-away force between the test cable and the heat shrinkable tube reaches the standard, if the water seepage test is unqualified, the problem of water seepage inside the semi-finished cable is solved. Under the condition that the pull-out force between the cable and the heat shrinkable tube does not reach the standard, the cable needs to be coated with the heat shrinkable tube for the second time, and then the water seepage test is carried out, so that the accuracy of the water seepage test result is ensured.
Meanwhile, the pulling-out force between the outer sheath and the semi-finished cable is usually larger than 100N, so that the tightness between the outer sheath and the semi-finished cable is far higher than the tightness between the heat shrink tube and the semi-finished cable, and the problem of water seepage can not occur when the outer sheath is used for coating the semi-finished cable under the condition that the test cable coated by the heat shrink tube does not have water seepage, so that the waterproof capability of the finished cable is ensured.
Further, as a preferred embodiment of the present invention, the steps of testing the cable jacket with the heat shrinkable tube in the present application are as follows: and selecting a heat-shrinkable tube, sleeving the heat-shrinkable tube on the periphery of the test cable, and heating the outer surface of the heat-shrinkable tube by using a hot air gun so that the heat-shrinkable tube is tightly sleeved on the periphery of the test cable. The sleeving manner of the heat shrink tube is relatively simple, and generally, only a heat gun is needed to heat the surface of the heat shrink tube, and the heat shrink tube can shrink by itself and wrap the periphery of the test cable.
Further preferably, the heat gun heats the heat shrinkable tube in the following manner: placing the test cable sleeved with the heat shrinkable tube on a plane, enabling a gun head of the hot air gun to face the surface of the heat shrinkable tube, starting the hot air gun, and moving the hot air gun along the extension direction of the test cable so that the hot air gun heats one side of the heat shrinkable tube; the test cable with the heat shrinkable tube is turned over on the plane by 180 degrees, the gun head of the heat gun faces the surface of the heat shrinkable tube, and the heat gun moves along the extending direction of the cable, so that the heat gun heats the other side of the heat shrinkable tube. In order to ensure that the heat shrinkable tube covers the test cable uniformly and prevent a gap from being generated between the heat shrinkable tube and the test cable as much as possible, one side of the heat shrinkable tube is heated, and then the heat shrinkable tube is turned over by 180 degrees and then the other side of the heat shrinkable tube is heated. Optionally, when the heat shrinkable tube is heated by the heat gun, the heat shrinkable tube may be heated from one end thereof until the other end; the heat shrinkable tube can also be heated from the middle part to the two ends, and all the heating is mainly performed to avoid air from being reserved between the inside of the heat shrinkable tube and the cable.
Further preferably, the distance between the gun head of the hot air gun and the outer surface of the heat shrinkable tube is 10-30 mm; the moving speed of the heat gun along the extending direction of the test cable is 30-50 mm/S, and the heating temperature of the heat gun on the surface of the heat shrinkable tube is 70-125 ℃. In order to ensure the uniform coating of the heat shrinkable tube on the test cable and ensure the tight binding of the interior of the heat shrinkable tube without air residue and coating, the heating condition of the heat shrinkable tube by the heat gun needs to be strictly limited. Meanwhile, the distance between the hot air gun and the heat shrinkable tube, the heating rate, the heating temperature and the like can ensure the shrinkage rate of the heat shrinkable tube and avoid the heat shrinkable tube from melting and the like. The heat shrinkable tube can melt when the temperature is higher than 125 ℃, so that the cable cannot be coated by the heat shrinkable tube, the distance between the gun head of the heat-control air gun and the outer surface of the heat shrinkable tube needs to be strictly controlled during heating, and the heating temperature of the heat shrinkable tube to the surface of the heat shrinkable tube is not higher than 125 ℃. Preferably, the heating temperature of the surface of the heat shrinkable tube is between 90 and 115 ℃, the radial shrinkage ratio of the heat shrinkable tube is about 2:1, the heat shrinkable tube has good covering force, and the problems of gaps and the like between the heat shrinkable tube and the cable are avoided.
Further preferably, the inner diameter of the heat shrinkable tube in the application is adaptive to the outer diameter of the cable to be detected, and the inner diameter of the heat shrinkable tube is 4-5 mm larger than the outer diameter to be detected. The actual size of the heat shrinkable tube is usually adjusted according to the size of the produced cable, the outer diameter size of the heat shrinkable tube is different from 3.2 mm to 125mm according to the size of the cable, the thickness of the heat shrinkable tube is usually 0.2 mm to 0.5mm, and the larger the cable size is, the larger the outer diameter of the heat shrinkable tube is, the larger the corresponding thickness of the heat shrinkable tube is.
Further, as a preferred embodiment of the present invention, the relationship among the inner diameter a of the heat shrinkable tube, the diameter B of the test cable, the diameter C of the test cable sleeved with the heat shrinkable tube, and the wall thickness D of the heat shrinkable tube wall in the present application is: b +5mm is more than or equal to A and less than or equal to 2B; and C-B is less than or equal to 2D. After the cable is externally wrapped with the heat shrinkable tube, the tight binding degree between the heat shrinkable tube and the test cable is judged except for the drawing force between the heat shrinkable tube and the test cable, and the pressure of the heat shrinkable tube for the test cable can be judged by measuring the size after wrapping so as to ensure that the leakage condition between the heat shrinkable tube and the test cable can not occur.
Further, as a preferred embodiment of the present invention, the heat shrinkable tube in the present application is a heat shrinkable sleeve made of polyolefin material, which has a double-layer structure, wherein the outer layer is made of cross-linked polyethylene material, and the inner layer is made of hot melt adhesive. The heat-shrinkable tube is formed by composite processing of a double-layer structure, and the waterproof heat-shrinkable tube is a heat-shrinkable tube with glue because of a co-extrusion production process of polyethylene and a hot melt adhesive of an adhesive layer. The outer layer is formed by polymerizing high-quality polyolefin, and has the functions of strong wear resistance, insulation, corrosion resistance and the like, the synthesis parameters of the crosslinked polyethylene are not described in detail, after the crosslinking reaction, the working temperature of the heat-shrinkable tube is-55-125 ℃, and the radial shrinkage ratio of the heat-shrinkable tube is about 2:1 under the heating condition; the inner layer is hot melt adhesive, and has low melting point, strong adhesive force, excellent sealing property and mechanical buffering performance. The inner wall of the waterproof layer is coated with a hot melt adhesive sealing layer, so that the waterproof layer has better waterproof capability. The hot melt adhesive is nearly solid, after the hot melt adhesive is attached to the surface of the semi-finished cable, the hot melt adhesive is tightly adhered to the semi-finished cable, the molecular distance between the hot melt adhesive and the semi-finished cable is far smaller than that of water molecules, and the water molecules cannot directly permeate through the hot melt adhesive under normal conditions.
Further, the method for detecting the waterproof performance of the optical cable is suitable for application of the ribbon cable in waterproof detection. The belt cable is of a square structure, so that the diameter of a sleeve is large, gaps among the reinforcing core, the sleeve and the filling rope are large, and a water seepage gap is also largest. Correspondingly, the method for detecting the waterproof performance of the optical cable can be suitable for detecting the waterproof performance of a full-dry or semi-dry cable. And can also be applied to the detection of the waterproof performance of other cable types besides the ribbon cable, such as a layer-twisted loose fiber cable, a central bundle tube type cable and the like.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for detecting the waterproof performance of an optical cable is characterized by comprising the following steps:
cutting a section of test cable from the semi-finished cable production line before the optical cable is sleeved with the outer sheath;
sleeving a heat shrink tube outside the test cable, and heating the heat shrink tube to enable the heat shrink tube to be tightly sleeved on the periphery of the test cable;
and testing the waterproof performance of the test cable wrapped with the heat shrinkable tube.
2. The method for detecting the waterproof performance of the optical cable according to claim 1, wherein the waterproof performance test includes a water seepage performance test, and the steps are as follows:
and arranging an indicating liquid column with a preset height at one end of the test cable, connecting one end of the test cable coated with the heat shrinkable tube with the bottom of the indicating liquid column, and observing whether the indicating liquid seeps out from the other end of the test cable in a preset time.
3. The method for detecting the waterproof property of an optical cable according to claim 1, wherein after the heat shrinkable tube heating jacket is disposed on the test cable, a pulling-out force between 100mm of the heat shrinkable tube and 100mm of the test cable is not less than 50N.
4. The method for detecting the waterproof performance of the optical cable according to claim 1, wherein the step of testing the cable jacket with the heat shrinkable tube is as follows:
and selecting a heat-shrinkable tube, sleeving the heat-shrinkable tube on the periphery of the test cable, and heating the outer surface of the heat-shrinkable tube by using a hot air gun so that the heat-shrinkable tube is tightly sleeved on the periphery of the test cable.
5. The method for detecting the waterproof performance of the optical cable according to claim 4, wherein the heat gun heats the heat shrinkable tube in a manner that: placing the test cable sleeved with the heat shrinkable tube on a plane, enabling a gun head of the hot air gun to face the surface of the heat shrinkable tube, starting the hot air gun, and moving the hot air gun along the extension direction of the test cable so that the hot air gun heats one side facing the heat shrinkable tube;
the test cable with the heat shrinkable tube is turned over on the plane by 180 degrees, the gun head of the heat gun faces the surface of the heat shrinkable tube, and the heat gun moves along the extending direction of the cable, so that the heat gun heats the other side of the heat shrinkable tube.
6. The method for detecting the waterproof performance of the optical cable according to claim 5, wherein the distance between the head of the heat gun and the outer surface of the heat shrinkable tube is 10-30 mm;
the moving speed of the hot air gun along the extension direction of the test cable is 30-50 mm/s;
the heating temperature of the hot air gun to the surface of the heat shrinkable tube is 70-125 ℃.
7. The method for detecting the waterproof performance of the optical cable according to claims 1 to 6, wherein the inner diameter of the heat shrinkable tube is adapted to the outer diameter of the cable to be detected, and the inner diameter of the heat shrinkable tube is 4 to 5mm larger than the outer diameter of the cable to be detected.
8. The method for detecting the waterproof property of an optical cable according to claims 1 to 6,
the relation among the inner diameter A of the heat shrinkable tube, the diameter B of the test cable, the diameter C of the test cable sleeved with the heat shrinkable tube and the wall thickness D of the tube wall of the heat shrinkable tube is as follows:
B+5mm≤A≤2B；
C-B≤2D。
9. the method for detecting the waterproof performance of the optical cable according to claims 1 to 6, wherein the heat shrinkable tube is a polyolefin heat shrinkable tube having a double-layer structure, an outer layer is a cross-linked polyethylene material, and an inner layer is a hot melt adhesive.
10. The method for detecting the waterproof performance of the optical cable according to any one of claims 1 to 9, wherein the method for detecting the waterproof performance of the optical cable is applied to waterproof detection of a ribbon cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210137745.7A CN114527051A (en) | 2022-02-15 | 2022-02-15 | Waterproof performance detection method and application of optical cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210137745.7A CN114527051A (en) | 2022-02-15 | 2022-02-15 | Waterproof performance detection method and application of optical cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114527051A true CN114527051A (en) | 2022-05-24 |
Family
ID=81623773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210137745.7A Pending CN114527051A (en) | 2022-02-15 | 2022-02-15 | Waterproof performance detection method and application of optical cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114527051A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5067343A (en) * | 1990-09-04 | 1991-11-26 | Southwire Company | Method for testing water impervious cable |
| CN101526574A (en) * | 2009-04-07 | 2009-09-09 | 张家港特恩驰电缆有限公司 | Wiring method in shielded cable test |
| CN104062221A (en) * | 2014-07-14 | 2014-09-24 | 杭州富通通信技术股份有限公司 | Optical cable water seepage detection device |
| CN206819772U (en) * | 2017-06-01 | 2017-12-29 | 中天科技海缆有限公司 | A kind of built-in full water repellent electric cable of optical cable |
| CN111354505A (en) * | 2020-03-12 | 2020-06-30 | 广州市穗羽电线电缆有限公司 | Mineral insulation fireproof cable and preparation method thereof |
| CN111751262A (en) * | 2020-07-18 | 2020-10-09 | 河南通达电缆股份有限公司 | Rapid test method for verifying longitudinal water resistance of conductor |
| CN112034276A (en) * | 2020-07-08 | 2020-12-04 | 通鼎互联信息股份有限公司 | Testing method for polyolefin insulation horizontal twisted pair cable for insulation digital communication |
| JP6832406B1 (en) * | 2019-09-25 | 2021-02-24 | 東日本電信電話株式会社 | Inspection equipment and inspection system |
| CN112414914A (en) * | 2020-10-29 | 2021-02-26 | 何远炳 | Optical fiber cable infiltration detection device |
| CN114034435A (en) * | 2021-11-08 | 2022-02-11 | 西安西古光通信有限公司 | Communication cable water seepage detection device and detection method thereof |
-
2022
- 2022-02-15 CN CN202210137745.7A patent/CN114527051A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5067343A (en) * | 1990-09-04 | 1991-11-26 | Southwire Company | Method for testing water impervious cable |
| CN101526574A (en) * | 2009-04-07 | 2009-09-09 | 张家港特恩驰电缆有限公司 | Wiring method in shielded cable test |
| CN104062221A (en) * | 2014-07-14 | 2014-09-24 | 杭州富通通信技术股份有限公司 | Optical cable water seepage detection device |
| CN206819772U (en) * | 2017-06-01 | 2017-12-29 | 中天科技海缆有限公司 | A kind of built-in full water repellent electric cable of optical cable |
| JP6832406B1 (en) * | 2019-09-25 | 2021-02-24 | 東日本電信電話株式会社 | Inspection equipment and inspection system |
| CN111354505A (en) * | 2020-03-12 | 2020-06-30 | 广州市穗羽电线电缆有限公司 | Mineral insulation fireproof cable and preparation method thereof |
| CN112034276A (en) * | 2020-07-08 | 2020-12-04 | 通鼎互联信息股份有限公司 | Testing method for polyolefin insulation horizontal twisted pair cable for insulation digital communication |
| CN111751262A (en) * | 2020-07-18 | 2020-10-09 | 河南通达电缆股份有限公司 | Rapid test method for verifying longitudinal water resistance of conductor |
| CN112414914A (en) * | 2020-10-29 | 2021-02-26 | 何远炳 | Optical fiber cable infiltration detection device |
| CN114034435A (en) * | 2021-11-08 | 2022-02-11 | 西安西古光通信有限公司 | Communication cable water seepage detection device and detection method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 徐玉杰主编: "《土石坝施工质量控制技术》", 黄河水利出版社, pages: 224 - 225 * |
| 李士稳: "\"光缆护套工序常见质量问题浅析\"", 《光纤与电缆及其应用技术》, no. 04, pages 29 - 32 * |
| 李强 等: "DMAIC在光缆渗水试验合格率改进中的应用", 《光纤与电缆及其应用技术》, no. 02, pages 23 - 27 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1167674A (en) | Optical fiber cable and process for production thereof | |
| US11911975B2 (en) | Carbon fiber reinforced plastic electrofusion fitting and a self-monitoring method of strain | |
| CA2819183C (en) | Liner for gas storage tank | |
| US8470213B2 (en) | Method for extrusion-molding loose tube and apparatus therefor, and loose tube | |
| US6931184B2 (en) | Dry tube fiber optic assemblies, cables, and manufacturing methods therefor | |
| NO334988B1 (en) | Polymer multilayer tubes, apparatus for preparing the multilayer tubing and process for the same | |
| US4832443A (en) | Fibre optic cable having a layer of a polyethylene composition and process of making same | |
| US7706640B2 (en) | Telecommunication optical cable for gas pipeline applications having built-in leakage detecting device | |
| CN100392464C (en) | Non-universal optical unit of submarine photoelectric composite cable and making method thereof | |
| JP2003526804A (en) | Fiber optic cable | |
| RU120183U1 (en) | MULTILAYER PIPE | |
| CN101673599A (en) | Composite section material with grating fibers for cable and preparation method thereof | |
| JP5155599B2 (en) | Method for producing hollow fiber membrane module for deaeration | |
| CN105974544A (en) | Sensing-communication composite optical cable | |
| CN103744151A (en) | Optical unit and optical cable using the same | |
| CN114527051A (en) | Waterproof performance detection method and application of optical cable | |
| CN110289134A (en) | Strong optical fiber composite intelligent cable used for intelligent electric network | |
| CN112558250A (en) | Preparation process of full-dry optical cable | |
| CN111443444A (en) | Sensing communication composite optical cable and manufacturing method thereof | |
| CN104575831A (en) | Intelligent and environment-friendly type power cable with aluminum alloy cores | |
| GB2143051A (en) | Submarine optical fibre cable | |
| CN105679466A (en) | Production process for armored steel wire outer protection layer of submarine cable | |
| DK2805823T3 (en) | Plastic pipe having at least two layers | |
| CN116009170B (en) | ADSS optical cable ice melting system | |
| CN112327436B (en) | High-strength retractable detection optical cable and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |