CN114019638A - Air-blowing micro cable, preparation method thereof and air-blowing construction method - Google Patents
Air-blowing micro cable, preparation method thereof and air-blowing construction method Download PDFInfo
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- CN114019638A CN114019638A CN202210007575.0A CN202210007575A CN114019638A CN 114019638 A CN114019638 A CN 114019638A CN 202210007575 A CN202210007575 A CN 202210007575A CN 114019638 A CN114019638 A CN 114019638A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
- G02B6/4432—Protective covering with fibre reinforcements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4486—Protective covering
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Abstract
The invention discloses an air-blowing micro cable which comprises a central reinforcing core, wherein the central reinforcing core is of a hollow structure, and an inner cavity of the central reinforcing core is used as an air-blowing channel for air blowing. The air-blowing micro cable has the following advantages: 1) the air-blown micro-cable has lighter weight under the condition of the same structural size of the air-blown micro-cable. 2) The hollow structure of the central reinforcing core is adopted, air pressure is added into the central reinforcing core of the air-blowing micro cable, and the air-blowing micro cable is subjected to the traction force of air flow in the central reinforcing core during air blowing, so that the air-blowing efficiency is high, and the construction efficiency is high. 3) The air blowing micro cable can be blown by applying air pressure to the inside and the outside of the air blowing micro cable at the same time, and the air blowing distance is longer.
Description
Technical Field
The invention belongs to the field of optical cables, and particularly relates to an air-blowing micro cable, a preparation method thereof and an air-blowing construction method.
Background
Currently, with the development of the communication industry in China and the construction requirement of mobile 5G, the requirement of network capacity is continuously improved. Meanwhile, urban land resources are increasingly deficient, and urban pipeline resources are increasingly tense, so that the optical fiber packaging density of the optical cable is urgently needed to be increased while the number of optical fiber cores in a limited pipeline is increased, and the air-blown optical cable technology becomes one of important ways for solving the problem.
The air-blowing micro cable is an optical cable which can be laid by using an air-blowing mode, has the advantages of high optical fiber density, small diameter, light weight and high air-blowing laying efficiency, is widely applied to backbone networks, local area networks, access networks and the like, effectively saves pipeline resources and meets the requirements of network expansion construction. Along with the popularization of the internet and the internet access requirement of mobile phones, the data transmission quantity is larger and larger, the original small-core air-blown micro cable cannot meet the current requirement, the demand quantity of the large-core air-blown micro cable is increased continuously, but the large-core air-blown micro cable has the characteristics of heavy optical cable, short air-blown distance, low air-blown efficiency and the like.
The outer diameter of a common GCYFY-144B1.3 optical cable is about 7.9mm, the weight per kilometer is about 60KG/km, under the general construction condition, the optical cable is blown into an air blowing pipeline with 12/10mm, the air blowing distance is about 1000 meters generally (the air blowing distance is related to the friction coefficient of the surface of the optical cable, the friction coefficient of the pipeline and the like), and the optical fiber splicing needs more cost due to the larger number of optical cable cores.
The problems encountered in the actual development process of the existing air-blowing micro cable are as follows: 1) the diameter of the central tube type air-blowing micro-cable structure is relatively large, the duty ratio (the area of the outer edge of the cross section of the micro-cable/the area of the inner edge of the cross section of the micro-tube) is higher in a micro-tube with the specification of 5/3.5mm, and the air-blowing effect is influenced; 2) the outer sheaths of the central tube type air-blowing micro-cables are all high-density polyethylene (HDPE), the friction coefficients of the HDPE are different from 0.12 to 0.35, the HDPE is mainly related to the grade and the processing technology of sheath materials selected by various manufacturers, and under the condition of high duty ratio, the good air-blowing effect is difficult to achieve by using the friction coefficients, so that the central tube type air-blowing micro-cables with some structures are difficult to overcome the defect of the friction coefficients, some air flow channels are arranged on the surfaces of the sheaths, the friction coefficients of products can be objectively reduced, but in the actual air-blowing application, the air-blowing effect is not greatly improved due to the abrasion of the surface materials of the sheaths and the adhesion of high-temperature and high-pressure materials, great breakthrough is difficult to achieve in the air-blowing distance, the requirements of long-distance air-blowing and high-efficiency construction of customers are difficult to meet, and the engineering progress can be influenced under the conditions of complicated construction routes and poor pipeline quality; 3) when HDPE (high-density polyethylene) is used as a sheath material and the HDPE material is used as the same material of an air blowing pipeline to rub, the fluctuation range of the friction coefficient is very large, which reflects that the air blowing effect is that the air blowing speed is unstable, and the air blowing construction safety is influenced.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides the air-blowing micro cable, the preparation method thereof and the air-blowing construction method, wherein the air-blowing can be carried out simultaneously from inside to outside, the air-blowing distance is lengthened, the continuous workload is reduced, the construction cost is reduced, the efficiency is improved, and the air-blowing distance of the air-blowing micro cable is effectively improved under the condition of not changing the outer diameter of the air-blowing micro cable.
To achieve the above object, according to one aspect of the present invention, there is provided an air-blown micro-cable comprising a central reinforcing core, wherein the central reinforcing core has a hollow structure, and an inner cavity of the central reinforcing core serves as an air-blowing passage for air-blowing.
Preferably, the roughness of the inner wall of the central reinforcing core is greater than that of the outer wall of the outer sheath of the air-blowing micro cable, so as to improve the air-blowing traction force.
Preferably, the internal space ratio of the central reinforcing core is 23% -30%.
Preferably, the air-blowing micro cable further comprises a sealing bearing sleeved at one end of the outer sheath of the air-blowing micro cable and used for being installed on the air-blowing machine, and the inner cavity of the sealing bearing is communicated with the inner cavity of the central reinforcing core, so that the air-blowing machine blows air towards the inner cavity of the central reinforcing core.
Preferably, the central reinforced core comprises a hollow core tube and a reinforcing piece arranged on the wall of the core tube, the axial direction of the reinforcing piece is consistent with the axial direction of the core tube, and the reinforcing piece protrudes out of the inner wall of the core tube and does not exceed the outer wall of the core tube;
the outer edge of the cross section of the core tube and the cross section of the reinforcing piece are both circular, and the connecting line of the circle centers of the cross sections of the two reinforcing pieces is marked asl，lPassing through the center of the outer edge of the cross section of the core tube.
According to another aspect of the present invention, there is provided a method for preparing the air-blown micro cable, comprising the steps of:
1) production of the central reinforcing core: respectively enabling the reinforcing parts to penetrate through openings in a mold core of a machine head of the extruding machine, blowing air into the mold core to form an inner cavity of a core pipe, enabling the high polymer material to flow outside the mold core and be attached to the reinforcing parts to form the core pipe, and enabling the core pipe and the reinforcing parts to form a hollow central reinforcing core together;
2) vacuum sizing: the central reinforcing core passes through a vacuum sizing sleeve of a vacuum sizing device, the outer diameter and the ovality of the central reinforcing core are guaranteed to meet set requirements through the vacuum sizing sleeve, and then the central reinforcing core is stored on a first wire spool;
3) and (3) optical cable subunit production: the optical fiber bundle is discharged from the second wire spool, enters the extruding machine after being coated with the fiber paste, is molded by the extruding machine to form a sleeve pipe which is sleeved on the optical fiber bundle, the sleeve pipe, the fiber paste and the optical fiber bundle jointly form an optical cable subunit, and then the optical cable subunit is coiled on the third wire spool;
4) cable core production: the central reinforced core is released from the first wire spool and the optical cable subunits are released from the third wire spool, water-blocking yarns are released on the central reinforced core, the optical cable subunits are wrapped around the central reinforced core in a twisting mode according to a set twisting pitch, aramid yarns are wrapped on the optical cable subunits, a cable core is formed in this mode, and the cable core is stored on the fourth wire spool;
5) production of the outer sheath: and the tested qualified cable core is discharged from the fourth wire spool, the water-blocking yarn is placed on the cable core, then an outer sheath coated around the cable core is formed by a plastic extruding machine, and the outer sheath and the cable core jointly form the air-blowing micro cable.
According to another aspect of the present invention, there is provided a method for constructing an air-blown micro cable, comprising the steps of:
1) respectively discharging the inner end and the outer end of an air-blowing micro cable which is stored on a wire spool to set lengths from the wire spool, wherein the outer end of the air-blowing micro cable is used for advancing in an air-blowing pipeline, and the inner end of the air-blowing micro cable is provided with a sealing bearing;
2) the position of the sealing bearing exceeds the end side plate of the I-shaped wire spool, then the sealing bearing is hermetically arranged on the air blowing machine, and the central line of the sealing bearing and the central line of the I-shaped wire spool are coaxially arranged;
3) the I-shaped winding disc rotates to pay off the air-blowing micro cable, and air flow blown out by the air-blowing machine flows into the inner cavity of the central reinforcing core after passing through the inner cavity of the sealing bearing, so that the outer end of the air-blowing micro cable is pushed to move in the air-blowing pipeline.
Preferably, the outer side of the air-blowing micro-cable is also air-blown by another air-blowing machine.
Preferably, a plug is installed at one end of the air-blowing micro cable, which is used for extending into the air-blowing pipeline, so as to plug the end part of the central reinforcing core.
Preferably, the air pressure blown inside the central reinforcing core does not exceed 12 bar.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1) according to the air-blowing micro cable, the central reinforcing core is of a hollow structure, the outer diameter of the air-blowing micro cable is not changed, so that the weight of the air-blowing micro cable is light, the friction force between the air-blowing micro cable and an air-blowing pipeline is reduced, air pressure can be applied to the inner end of the air-blowing micro cable on the wire spool towards the inside of the central reinforcing core during air-blowing construction, the effect of air blowing from the inside can be achieved, and the air-blowing distance of the air-blowing micro cable is improved.
2) According to the air-blowing micro cable, the end cap is arranged at one end of the air-blowing micro cable, and in the air-blowing process of blowing air into the interior of the central reinforcing core, the air-blowing micro cable is subjected to friction and thrust, and the traction force of the end cap is also arranged at one end of the air-blowing micro cable, so that the air-blowing micro cable is easier to bend over particularly in the turning place of a pipeline route in the air-blowing process, the air-blowing distance is longer, and the air-blowing efficiency is higher.
Drawings
FIG. 1 is a schematic structural view of an air-blown micro-cable of the present invention;
FIG. 2 is a schematic view of the air-blown micro-cable of the present invention being stored on a wire reel during air-blowing construction;
FIG. 3 is a schematic view of a mandrel used on an extruder in the process for making an air-blown micro-cable of the present invention;
the same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein: 1-a reinforcement; 2-a central reinforcing core; 3-water blocking yarn; 4-an optical fiber; 5-fiber paste; 6-a sleeve; 7-aramid yarn; 8-an outer sheath; 101-a wire spool; 102-a sealed bearing; 103-air blowing micro cable; 9-a mold core; 91-opening the hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and 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.
Referring to fig. 1 to 3, an air-blowing micro cable 103 includes an outer sheath 8, and a central reinforcing core 2, optical cable subunits, and water blocking yarns 3 disposed in the outer sheath 8, where the optical cable subunits are arranged around the central reinforcing core 2 in a twisted manner, the water blocking yarns 3 are respectively disposed on the central reinforcing core 2 and the optical cable subunits, the central reinforcing core 2 includes a hollow core tube and two reinforcing members 1 disposed on a tube wall of the core tube and parallel to each other, the reinforcing members 1 preferably adopt FRP strips, and an inner cavity of the core tube serves as an air-blowing channel for air blowing. The axial direction of the reinforcing member 1 is consistent with the axial direction of the core tube, and the reinforcing member 1 protrudes out of the inner wall of the core tube and does not exceed the outer wall of the core tube, so that the strength of the central reinforcing core 2 can be improved, and the central reinforcing core 2 can bear larger air pressure. According to the air-blowing micro cable 103 with the structure, the central reinforcing core 2 is of a hollow structure, and the size of the air-blowing micro cable 103 is not changed, so that the weight of the air-blowing micro cable 103 is light, and the friction force between the air-blowing micro cable 103 and an air-blowing pipeline is reduced.
The cross section of the central reinforcing core 2 is of a centrosymmetric structure, the outer edge of the cross section of the core tube is a circle, the inner edge of the cross section of the core tube is provided with two sections of arc lines, and the end part of each section of arc line is respectively connected with the cross section of one reinforcing member 1.
The cross section of the reinforcing part 1 is circular, and the connecting line of the circle centers of the cross sections of the two reinforcing parts 1 is recorded asl，lPassing through the center of the outer edge of the cross section of the core tube.
The roughness of the inner wall of the central reinforcing core 2 is greater than that of the outer wall of the outer sheath 8, so that the air blowing traction force is improved.
The internal air ratio of the central reinforcing core 2 (which can be considered as the area of the inner edge of the cross section of the central reinforcing core 2/the area of the outer edge of the cross section of the central reinforcing core 2) is 23% -30%, so that enough high air pressure is formed in the inner cavity of the central reinforcing core 2, and the maximum air pressure blown from the inside of the central reinforcing core 2 can be 12 bar.
Usually, the friction coefficient of the air-blown micro cable 103 with respect to the silicon core pipe at the inlet is 0.05 to 0.07, and in order to increase the air-blown traction force in the pipe of the central reinforcing core 2, the material characteristics are changed when the central reinforcing core 2 is produced, so that the friction coefficient of the inner wall of the central reinforcing core 2 is relatively large. The friction coefficient is a relative value, the friction coefficient of the surface of the air-blown micro cable 103 is a relative value with the silicon core tube, the friction coefficient of the inner central reinforcement core 2 is a little larger than that of the surface of the air-blown micro cable 103, namely, the inner wall of the central reinforcement core 2 is rougher than the outer surface of the outer sheath 8, and the roughness is larger.
Aiming at the condition that the air-blowing micro cable 103 is coiled on the wire spool for paying off and air-blowing, a sealing bearing used for being installed on an air-blowing machine is further sleeved at one end 8 of the outer sheath of the air-blowing micro cable 103, and the inner cavity of the sealing bearing is communicated with the inner cavity of the central reinforcing core 2, so that the air-blowing machine blows air towards the inner cavity of the central reinforcing core 2. The air blower can blow air towards the inner cavity of the sealed bearing, and then the air flow can also enter the inner cavity of the central reinforcing core 2, so that the air-blowing micro cable can be pushed to run in the air-blowing pipeline.
According to another aspect of the present invention, there is also provided a method for preparing the air-blown micro cable 103, comprising the steps of:
1) production of the central reinforcing core 2: each reinforcing member 1 respectively penetrates through an opening 91 on a mold core 9 of a machine head of an extruding machine, two FRP strips are symmetrically arranged at 180 degrees, air is blown into the mold core 9 to form an inner cavity of a core pipe, a high polymer material flows outside the mold core 9 and is attached to the two reinforcing members 1 to form the core pipe, the core pipe and the two reinforcing members 1 form the hollow central reinforcing core 2 together, and the high polymer material is preferably PE material.
2) Vacuum sizing: the central reinforced core 2 passes through a vacuum sizing sleeve of a vacuum sizing device, the outer diameter and the ovality of the central reinforced core 2 are ensured to meet the set requirements through the vacuum sizing sleeve, the outer diameter of the central reinforced core 2 is 4.1mm, the ovality is generally less than 5%, and the wall thickness of the central reinforced core 2 produced by the process is approximately 0.5 mm-0.6 mm. The central reinforcing core 2 is then wound up on the first wire spool.
3) And (3) optical cable subunit production: the optical fiber bundle 4 is discharged from the second wire spool, the optical fiber bundle 4 enters the extruding machine after being coated with the optical fiber paste 5, the sleeve 6 formed by the extruding machine is sleeved on the optical fiber bundle 4, the sleeve 6, the optical fiber paste 5 and the optical fiber bundle 4 jointly form an optical cable subunit, and then the optical cable subunit is coiled on the third wire spool; the sleeve 6 of the optical cable subunit is made of PBT material or TPEE material, and thixotropic fiber paste 5 is filled in the sleeve 6, so that the optical fiber is protected, and the water seepage prevention performance of the sleeve 6 is also ensured. The outer diameter of the sleeve 6 is controlled to be 1.42 mm-1.5 mm, the excess length of the optical fiber is controlled to be +/-0.02 percent through a stranding process, the wall thickness of the sleeve 6 is controlled to be 0.1 mm-0.15 mm, and the cable core can be produced after the sleeve 6 is tested to be qualified.
4) Cable core production: the central reinforced core 2 is paid out from a first wire spool and a plurality of optical cable subunits are paid out from a third wire spool, the tension of the central reinforced core 2 is controlled to be 25N-35N, the optical cable subunits are paid out with the tension of 1N, the water-blocking yarn 3 is placed on the central reinforced core 2, 1 ZS-10.0 water-blocking yarn 3 is preferably placed on the central reinforced core 2 in a winding and straight mode, the optical cable subunits are wrapped around the central reinforced core 2 according to a set stranding pitch in a twisting mode, the optical cable subunits are wrapped with aramid yarns 7, the optical cable subunits are preferably fixed through 2 aramid yarns 7 with the specification of 1500D (1670Dtex), the tension of the aramid yarns 7 is as small as possible, the sleeve 6 is prevented from being punctured, a cable core is formed in such a mode, and the optical cable core is stored on a fourth wire spool; and the yarn winding adopts a shuttle flying to pay off, so that the water seepage prevention performance of the optical cable subunit and the central reinforcing core 2 is ensured.
5) Production of the outer sheath 8: the qualified cable core is discharged from the fourth wire spool, the water-blocking yarn 3 is placed on the cable core, the water-blocking yarn 3 is preferably placed and wound outside the cable core to ensure the water-blocking performance, then an outer sheath 8 which is wrapped around the cable core is formed through an extruding machine, and the outer sheath 8 and the cable core jointly form the air-blowing micro cable 103; the outer sheath 8 is made of northern Europe chemical HDPE6069 with a small friction coefficient.
The production of the air-blowing micro cable 103 is completed through the steps, the air-blowing micro cable 103 produced by the process is light in weight, long in air-blowing distance and high in air-blowing efficiency, through a comparison test of the produced air-blowing micro cable 103, the air-blowing distance of the air-blowing micro cable 103 with the structure is 50% longer than that of the traditional optical cable, the air-blowing speed is higher under the same air-blowing condition, the time is saved by 30% when the air-blowing micro cable with the same length is blown, convenience is brought to construction, and the air-blowing construction efficiency is improved.
According to another aspect of the present invention, there is provided a method for constructing the air-blown micro cable 103, comprising the steps of:
1) the inner end and the outer end (two ends of the air-blowing micro cable 103 are divided into the inner end and the outer end, the outer end can be freely paid off, and the inner end cannot be freely paid off) of the air-blowing micro cable 103 stored on the wire spool are respectively released from the wire spool to set lengths, the outer end of the air-blowing micro cable 103 is used for advancing in an air-blowing pipeline, and the inner end of the air-blowing micro cable 103 is provided with a sealing bearing 102. The air blown micro cable 103 has a length of about 2 meters paid out at its inner end.
2) The hermetic bearing 102 is positioned beyond the end side plates of the i-shaped spool 101 (the i-shaped spool 101 has a middle cylinder for winding and unwinding the wire and end side plates provided at both ends of the middle cylinder), and then the hermetic bearing 102 is hermetically mounted on the air blower such that the center line of the hermetic bearing 102 is arranged coaxially with the center line of the i-shaped spool 101. The section of the air-blowing micro cable 103 provided with the sealing bearing 102 can be fixed on the side plate at the end part of the I-shaped wire spool 101 through the pipe clamp, so that the section is prevented from swinging when the I-shaped wire spool 101 rotates; this section is ultimately removed and unusable because it is subject to torsional forces which have an effect on the fiber.
3) The I-shaped wire spool 101 rotates to pay off the air-blowing micro cable 103, and the air-blowing machine blows air to the inner cavity of the central reinforcing core 2 to push the outer end of the air-blowing micro cable 103 to move in the air-blowing pipeline. Meanwhile, optionally, another air blower is also used for blowing air outside the air-blowing micro cable 103, so that the air-blowing micro cable 103 can be blown inside and outside, the air-blowing efficiency is improved, the air pressure inside the central reinforcing core 2 of the air-blowing micro cable 103 is preferably smaller than the air pressure outside the outer sheath 8, and the air-blowing micro cable 103 is effectively prevented from shaking in an air-blowing pipeline. When the inner end of the air-blowing micro cable 103 is blown and paid off, the I-shaped wire spool 101 rotates at the same time, so that the air-blowing micro cable 103 is driven by the I-shaped wire spool 101 to rotate together, the sealing bearing 102 can ensure that the inner end of the air-blowing micro cable 103 is synchronously untwisted to rotate, and the air-blowing machine is not influenced to pressurize the inside of the central reinforcing core 2. In addition, the end cap is installed to the one end that air-blowing micro cable 103 is used for stretching into the air-blowing pipeline to be used for the tip of shutoff center reinforcing core 2, then at the air-blowing in-process, air-blowing micro cable 103 not only receives frictional force and thrust, and the one end of air-blowing micro cable 103 still has the traction force of end cap, and at the air-blowing in-process like this, especially in the place that air-blowing pipeline turned, air-blowing micro cable 103 was more easily bent, and the air-blowing distance is farther like this, and air-blowing efficiency is higher. Of course, from the viewpoint of safety, internal blowing may be achieved without using a plug.
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. An air-blown micro-cable comprising a central reinforcing core (2), characterized in that the central reinforcing core (2) is of a hollow structure and the inner cavity of the central reinforcing core (2) is used as an air-blowing channel for air-blowing.
2. An air-blown micro-cable according to claim 1, wherein the roughness of the inner wall of said central reinforcing core (2) is greater than the roughness of the outer wall of the outer sheath (8) of the air-blown micro-cable to improve the air-blowing traction.
3. An air-blown micro-cable according to claim 1, wherein the hollow proportion of said central reinforcing core (2) is between 23% and 30%.
4. An air-blowing micro-cable according to claim 1, further comprising a sealing bearing sleeved at one end of the outer sheath of the air-blowing micro-cable for mounting to an air-blowing machine, the inner cavity of the sealing bearing being in communication with the inner cavity of the central reinforcing core (2) so that the air-blowing machine blows air towards the inner cavity of the central reinforcing core (2).
5. A gas-blown micro cable according to claim 1, wherein the central reinforcing core (2) comprises a hollow core tube and a reinforcing member (1) provided on a wall of the core tube, an axial direction of the reinforcing member (1) being coincident with an axial direction of the core tube, the reinforcing member (1) protruding from an inner wall of the core tube and not exceeding an outer wall of the core tube;
the outer edge of the cross section of the core tube and the cross section of the reinforcing piece (1) are both circular, and the connecting line of the circle centers of the cross sections of the two reinforcing pieces (1) is marked asl，lPassing through the center of the outer edge of the cross section of the core tube.
6. A method of making an air-blown micro-cable according to any one of claims 1 to 5, comprising the steps of:
1) production of the central reinforcing core (2): respectively enabling the reinforcing parts (1) to pass through openings (91) on a mold core (9) of a machine head of an extruding machine, blowing air into the mold core (9) to form an inner cavity of a core pipe, enabling the high polymer material to flow outside the mold core (9) and be attached to the reinforcing parts (1) to form the core pipe, and enabling the core pipe and the reinforcing parts (1) to form a hollow central reinforcing core (2);
2) vacuum sizing: the central reinforcing core (2) passes through a vacuum sizing sleeve of a vacuum sizing device, the outer diameter and the ovality of the central reinforcing core (2) are guaranteed to meet set requirements through the vacuum sizing sleeve, and then the central reinforcing core (2) is wound on a first wire winding disc;
3) and (3) optical cable subunit production: the optical fiber bundle (4) is discharged from the second wire spool, the optical fiber bundle enters an extruding machine after being coated with the fiber paste (5), a sleeve (6) formed by the extruding machine is sleeved on the optical fiber bundle (4), the sleeve (6), the fiber paste (5) and the optical fiber bundle (4) jointly form an optical cable subunit, and then the optical cable subunit is coiled on a third wire spool;
4) cable core production: the central reinforced core (2) is paid out from the first wire reel and the optical cable subunits are paid out from the third wire reel, the water-blocking yarn (3) is paid out from the central reinforced core (2), the optical cable subunits are wrapped around the central reinforced core (2) according to the set stranding pitch in a stranding mode, the aramid yarn (7) is wrapped on the optical cable subunits, in this way, a cable core is formed, and the cable core is stored on the fourth wire reel;
5) production of the outer sheath (8): and the cable core qualified in test is discharged from the fourth wire spool, the water-blocking yarn (3) is placed on the cable core, then an outer sheath (8) coated around the cable core is formed by a plastic extruding machine, and the outer sheath (8) and the cable core jointly form the air-blowing micro cable.
7. The air-blowing construction method of the air-blowing micro cable according to any one of claims 1 to 5, comprising the steps of:
1) respectively discharging the inner end and the outer end of an air-blowing micro cable (103) which is stored on a wire spool to set lengths from the wire spool, wherein the outer end of the air-blowing micro cable (103) is used for advancing in an air-blowing pipeline, and the inner end of the air-blowing micro cable (103) is provided with a sealing bearing (102);
2) the position of the sealing bearing (102) exceeds the end side plate of the I-shaped wire spool (101), then the sealing bearing (102) is hermetically installed on the air blowing machine, and the central line of the sealing bearing (102) and the central line of the I-shaped wire spool (101) are coaxially arranged;
3) the I-shaped wire spool (101) rotates to pay off the air-blowing micro cable (103), and air flow blown out by the air-blowing machine flows into the inner cavity of the central reinforcing core (2) after passing through the inner cavity of the sealing bearing (102), so that the outer end of the air-blowing micro cable (103) is pushed to advance in an air-blowing pipeline.
8. The air-blowing construction method of the air-blowing micro-cable according to claim 7, wherein the outside of the air-blowing micro-cable (103) is also air-blown by another air-blowing machine.
9. The air-blowing construction method of the air-blowing micro cable according to claim 7, wherein a plug is installed at one end of the air-blowing micro cable (103) for extending into an air-blowing pipeline, so as to plug the end of the central reinforcing core (2).
10. The air-blowing construction method of an air-blowing micro cable as claimed in claim 7, wherein an air pressure of the air-blowing inside the central reinforcing core (2) is not more than 12 bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210007575.0A CN114019638B (en) | 2022-01-06 | 2022-01-06 | Air-blowing micro cable, preparation method thereof and air-blowing construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210007575.0A CN114019638B (en) | 2022-01-06 | 2022-01-06 | Air-blowing micro cable, preparation method thereof and air-blowing construction method |
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| WO2024125365A1 (en) * | 2022-12-16 | 2024-06-20 | 长飞光纤光缆股份有限公司 | Air blown optical cable suitable for high-temperature installation working environment and construction method therefor |
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| WO2024125365A1 (en) * | 2022-12-16 | 2024-06-20 | 长飞光纤光缆股份有限公司 | Air blown optical cable suitable for high-temperature installation working environment and construction method therefor |
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| Publication number | Publication date |
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| CN114019638B (en) | 2022-04-05 |
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