CN115793161A - Production system, method, product and optical cable of full-dry type high-water-blocking-performance optical unit - Google Patents
Production system, method, product and optical cable of full-dry type high-water-blocking-performance optical unit Download PDFInfo
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- CN115793161A CN115793161A CN202211511496.XA CN202211511496A CN115793161A CN 115793161 A CN115793161 A CN 115793161A CN 202211511496 A CN202211511496 A CN 202211511496A CN 115793161 A CN115793161 A CN 115793161A
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Abstract
The invention discloses a production system of a full-dry type high-water-blocking-performance optical unit, which comprises an optical fiber torsion piece, a bundling die, a static removing device and an extruder which are sequentially arranged on the advancing path of an optical fiber, wherein the optical fiber torsion piece comprises a torsion die and a central rotating shaft, the torsion die is provided with a plurality of wiring through holes, and a power mechanism is connected with the central rotating shaft to drive the central rotating shaft to rotate forwards and backwards so as to drive the torsion die to rotate forwards and backwards; the inner cavity of the central rotating shaft is a through hole so that the water-blocking yarn can pass through the inner cavity of the central rotating shaft; the bundling die is provided with a bundling hole for gathering the water-blocking yarns passing through the optical fiber twisting piece and all the optical fibers together to form a finished yarn, and then the finished yarn enters the extruder; the static removing device is used for removing static electricity generated by friction of the wire harness; the extruder is used to extrude a loose tube around the outer circumference of the strand. The invention can effectively avoid the adherence and accumulation of the water-blocking yarns and the optical fibers in the loose tube, reduce the size of the loose tube, reduce the transmission loss and reduce the product cost.
Description
Technical Field
The invention belongs to the field of optical unit production equipment, and particularly relates to a production system, a production method, a product and an optical cable of a full-dry type high-water-blocking-performance optical unit.
Background
The optical cable can be divided into a filling type optical cable, a semi-dry type optical cable and a full-dry type optical cable according to different water blocking modes, wherein the filling type optical cable and the semi-dry type optical cable mainly adopt a mode of filling factice in an optical fiber loose sleeve to achieve the water blocking effect, but the factice is difficult to clean in the construction process, and simultaneously, the environmental pollution is caused, and certain inconvenience is brought to the optical cable construction. The full-dry optical cable is free of grease filling in the production process, so that troubles in the construction process are solved, and the concept of environmental protection is met, so that the full-dry optical cable is a great trend of future optical cable development.
The advantage of the factice-free filling in the loose tube of the full-dry optical cable is increasingly widely applied in the production of the optical cable, and water-blocking yarns or water-blocking powder are required to be put into the loose tube to ensure the water-blocking performance of the loose tube. The water-blocking yarn does not have the phenomena of powder falling and powder flying, so the water-blocking yarn has reliable water-blocking performance, simultaneously has simple manufacturing process and low cost, the full-dry optical unit adopting the water-blocking yarn is widely applied, and the general loose tube optical unit with high water-blocking performance adopts the water-blocking yarn as a water-blocking element. However, as technology advances, the size of loose tubes is shrinking in order to increase fiber density. However, tests have shown that, in a loose tube optical unit of a small diameter, a loose tube of the same size, an all-dry optical unit using water-blocking yarn as a water-blocking element has higher transmission loss than an all-dry optical unit using water-blocking powder as a water-blocking element. Therefore, the full-dry type optical unit using the water-blocking yarn is less applied to the small-sized loose tube, and the application is limited.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides a production system and a production method of a full-dry type high-water-resistance optical unit, wherein an optical fiber twisting piece is adopted to twist an optical fiber in the forward direction and the reverse direction before entering a loose tube, a central rotating shaft places water-blocking yarns at the center of the twisted optical fiber, and the adherence and accumulation phenomena of the water-blocking yarns and the optical fiber in the loose tube can be effectively avoided, so that the transmission performance and the water-resistance performance of the optical fiber are ensured on the premise of adopting a small-diameter loose tube without large space in the loose tube.
To achieve the above object, according to one aspect of the present invention, there is provided a system for producing a full-dry type high water-blocking performance optical unit, including an optical fiber twist member, a bundling mold, a static electricity removing device, and an extruder, which are arranged in this order along an advancing path of an optical fiber, and:
the optical fiber twisting part comprises a twisting die and a central rotating shaft which are fixedly connected together, the twisting die is provided with a plurality of wiring through holes, the wiring through holes are uniformly distributed in the circumferential direction around the central line of the central rotating shaft, the wiring through holes are used for enabling optical fibers to pass through the twisting die, a power mechanism is connected with the central rotating shaft, the power mechanism is connected with the optical fiber twisting part to drive the optical fiber twisting part to rotate forwards and reversely, and the inner cavity of the central rotating shaft is a through hole so that water-blocking yarns can pass through the inner cavity of the central rotating shaft;
the bundling die is provided with a bundling hole for gathering the water-blocking yarns passing through the optical fiber twisting piece and all the optical fibers together to form a finished yarn, and then the finished yarn enters an extruder;
the static removing device is used for removing static electricity generated by friction of the wire harness;
the extruder is used for extruding the loose tube at the periphery of the wire harness.
Preferably, the initial position of the twisting mold when the twisting mold is not rotated is 0 °, and the twisting mold rotates forwards by 270 ° from the initial position and then rotates backwards by 270 ° to return to the initial position.
Preferably, the loose tube is made of PBT, PP, TPE or TPEE.
Preferably, the outer diameter of the loose tube is 1.2 mm-4.0 mm.
Preferably, the number of the optical fibers is 2 to 24.
Preferably, the number of the routing through holes is 6-24, and the diameter of the routing through holes is 2 mm-10 mm.
According to another aspect of the present invention, there is also provided a method for producing a fully dry type high water-blocking performance optical unit, the optical unit is produced by using the production system of the fully dry type high water-blocking performance optical unit,
preferably, the method for producing the full-dry type high water blocking performance optical unit comprises the following steps:
1) The water blocking yarn and each optical fiber are respectively paid out from a pay-off rack;
2) Each optical fiber respectively passes through one routing through hole on the twisting mold, the water-blocking yarns pass through the central rotating shaft, and then the water-blocking yarns and all the optical fibers are gathered together into a wiring harness through the bundling holes of the bundling mold;
3) The wire harness passes through the static removing device and the extruder and then is connected to the traction device;
4) The traction device pulls the optical fiber to advance, the twisting die rotates forwards and backwards to twist the optical fiber, the extruder extrudes the loose tube to wrap the wire harness, and the optical unit is obtained.
According to another aspect of the present invention, there is also provided an all-dry type optical unit with high water-blocking performance, which is characterized in that the production system for the all-dry type optical unit with high water-blocking performance provided by the present invention produces an optical unit with an outer diameter of 1.2mm to 4.0mm.
According to another aspect of the invention, an optical cable is also provided, which is characterized by comprising the full-dry type high water-blocking performance optical unit provided by the invention;
when the optical cable is a central tube type optical cable, the optical cable is provided with the full-dry type high water-blocking performance optical unit, and an outer sheath is arranged outside the full-dry type high water-blocking performance optical unit;
when the optical cable is a layer stranded optical cable, the optical cable is provided with a plurality of full-dry type high water-blocking performance optical units; the optical unit with the full-dry type high water-blocking performance is stranded with the central reinforcing part to form a cable core, and an outer sheath is arranged on the outer side of the cable core.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
when the water-blocking yarn is adopted in the loose tube of the optical unit to block water, the optical fiber before entering the loose tube is subjected to forward and reverse twisting through the optical fiber twisting piece, the water-blocking yarn and the optical fiber can be separated as far as possible, the water-blocking yarn can be surrounded by the optical fiber after penetrating through the hollow central rotating shaft and is positioned in the surrounded center, so that the phenomenon that the water-blocking yarn and the optical fiber are irregularly twisted together to cause adherence and accumulation in the loose tube can be avoided, the generation of inferior-quality products is effectively avoided, the size of the loose tube is favorably reduced, the transmission loss is reduced, and the product cost is reduced.
Drawings
FIG. 1 is a schematic diagram of a system for producing a fully dry high water blocking performance optical unit of the present invention;
FIG. 2 is a schematic view of a fiber twist 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-optical fiber, 2-routing through hole, 3-central rotating shaft, 4-water-blocking yarn, 5-bundling die, 6-extruder, 7-loose sleeve, 8-wire harness, 9-optical fiber torsion piece and 10-static removing device.
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 do not 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.
Through repeated practice, the problem that the transmission loss of an optical unit adopting the water blocking yarns is high is explored, the adhesive used by the water blocking yarns is found, the water blocking yarns and the optical fibers are irregularly twisted together, the water blocking yarns are attached to the inner wall of the loose sleeve, the water blocking yarns and the optical fibers are locally accumulated to generate overlarge excess length, the optical fibers are extruded to bear force, and the optical transmission loss is increased in the small-diameter optical unit due to the fact that the water blocking yarns and the optical fibers are both extruded. In the loose tube with larger diameter, the water-blocking yarn and the optical fiber are not obviously accumulated due to enough space in the loose tube, and the transmission loss of the optical fiber is not greatly influenced. Along with the demand that the density of the optical fiber is continuously improved, the problem that the diameter of the loose tube cannot be further reduced due to the accumulation of the water-blocking yarns is more obvious. Meanwhile, the larger diameter of the optical unit, the too large optical fiber and the extra length of the water-blocking yarn will also increase the cost.
Referring to fig. 1 and 2, the system for producing a full-dry type optical unit with high water blocking performance according to the present invention includes an optical fiber twisting member 9, a bundling mold 5, a static removing device 10, and an extruder 6, which are sequentially disposed along an advancing path of an optical fiber 1, and further:
the optical fiber twisting part 9 comprises a twisting mold and a central rotating shaft 3 which are fixedly connected together, the twisting mold is provided with a plurality of routing through holes 2, the routing through holes 2 are uniformly distributed around the central line of the central rotating shaft 3 in the circumferential direction, the routing through holes 2 are used for enabling the optical fiber 1 to pass through the twisting mold, the routing through holes 2 are 6-24, the diameter of the routing through holes 2 is 2-10 mm, the optical fibers 1 are 2-24, the power mechanism is connected with the optical fiber twisting part 9 to drive the optical fiber twisting part 9 to rotate forwards and backwards (firstly rotate forwards in a first direction and then rotate backwards in a second direction opposite to the first direction), so that the twisting mold also rotates forwards and backwards, the power mechanism is preferably connected with the central rotating shaft 3 to drive the twisting mold to rotate forwards and backwards through driving the central rotating shaft 3 to rotate forwards and backwards, the inner cavity of the central rotating shaft 3 is a through hole so that the water blocking yarn 4 can conveniently pass through the inner cavity of the central rotating shaft 3, the water blocking yarn 4 is surrounded by the optical fiber 1 after passing through the central rotating shaft 3 and is positioned at the center of the twisted optical fiber 1, and the water blocking yarn 4 is placed at the twisting center of the optical fiber 1, so that the water blocking yarn 4 is mainly prevented from directly contacting with the inner wall of a loose tube 7 extruded by a subsequent extruder, the inner walls of the water blocking yarn 4 and the loose tube 7 are separated as far as possible, the phenomenon that the water blocking yarn 4 is attached to the loose tube 7 or the optical fiber 1 and irregular twisting can be effectively avoided due to an adhesive on the water blocking yarn 4 under the high-temperature action of materials extruded by the loose tube, the accumulation of local water blocking yarn and optical fiber due to irregular twisting is reduced, and the light loss caused by stress accumulation is reduced.
The bundling die 5 is provided with a bundling hole for gathering the water-blocking yarn 4 passing through the optical fiber twisting piece 9 and all the optical fibers 1 together to form a bundle 8, and then feeding the bundle into an extruder 6;
the static electricity removing device 10 is used for removing static electricity generated by friction of the wiring harness 8; the static removing device is very important for reducing the local accumulation of the water blocking yarn and the optical fiber. Because the optical fiber needs to be in a free state as much as possible in the loose tube, the paying-off tension cannot be too large, and under the action of smaller paying-off tension, the electrostatic adsorption force has no negligible influence on the relative positions and the twisting forms between the optical fiber and between the optical fiber and the water-blocking yarn. Especially, when it is desired to adjust the position between the water-blocking yarn and the optical fiber by twisting the optical fiber to prevent the water-blocking yarn from adhering to the loose tube, if the electrostatic attraction is large and the paying-off tension is small, the water-blocking yarn may not be adjusted to the inside of the plurality of optical fibers in a desired form but still adhere to the loose tube, greatly impairing the effect of the optical fiber twisting member on the adjustment of the position of the optical fiber and the water-blocking yarn. Therefore, the effect of the torsion piece on adjusting the positions of the optical fiber and the water blocking yarn can be improved by matching with the static removing device, the probability of adherence of the water blocking yarn is further reduced, the transmission loss is reduced when the small-diameter optical unit adopting the water blocking yarn is produced, and the optical unit with high water blocking performance is obtained.
The extruder 6 is used to extrude a loose tube 7 around the periphery of a strand 8. Since the loose tube 7 is used, there is a gap between the loose tube 7 and the wire harness 8, and therefore, when the loose tube 7 is extruded, the twisting of the wire harness 8 does not adversely affect the extrusion of the loose tube 7.
The loose tube 7 is made of PBT, PP, TPE or TPEE, and the outer diameter of the loose tube 7 is 1.2-4.0 mm.
Further, the initial position of the twisting mold when the twisting mold is not rotated is 0 degree, and the twisting mold rotates forwards for 270 degrees from the initial position and then rotates reversely for 270 degrees to return to the initial position, so that the optical fibers 1 and the water blocking yarns 4 are fully dispersed.
According to another aspect of the present invention, there is provided a method for producing a full-dry type optical unit with high water-blocking performance, the method comprising the steps of:
1) The water blocking yarn 4 and each optical fiber 1 are respectively paid out from a pay-off rack;
2) Each optical fiber 1 respectively penetrates through a wiring through hole 2 on the twisting mold, the water blocking yarn 4 penetrates through the central rotating shaft 3, and then the water blocking yarn 4 and all the optical fibers 1 are collected together into a wiring harness 8 through a bundling hole of the bundling mold 5;
3) The wiring harness 8 passes through the static eliminating device 10 and the extruder 6 and then is connected to a traction device;
4) The traction device pulls the optical fiber 1 to advance, the twisting die rotates forwards and backwards to twist the optical fiber 1, the extruder 6 extrudes the loose tube 7 to wrap the wire harness 8, and the optical unit is obtained.
Referring to fig. 1,6 optical fibers 1 pass through routing through holes 2 uniformly distributed along the circumference, a twisting die is connected with a central rotating shaft 3 into a whole, the optical fibers 1 are driven to twist forward and backward at a proper speed and pitch, a loose tube 7 is discharged through an inner cavity of a central shaft by water-blocking yarns 4, is positioned at the center of an optical fiber 1 bundle formed by twisting the optical fibers 1, enters a bundling die 5 together to be collected into a bundle 8, and then directly enters an extruder 6 to finish the production of an optical unit.
It will be understood by those skilled in the art that the foregoing is only an exemplary embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, since various modifications, substitutions and improvements within the spirit and scope of the invention are possible and within the scope of the appended claims.
Claims (10)
1. The production system of the full-dry type high water-blocking performance optical unit is characterized by comprising an optical fiber torsion piece, a bundling die, a static electricity removing device and an extruder which are sequentially arranged on an advancing path of an optical fiber, and the production system comprises:
the optical fiber twisting part comprises a twisting die and a central rotating shaft which are fixedly connected together, the twisting die is provided with a plurality of routing through holes which are uniformly distributed in the circumferential direction around the central line of the central rotating shaft, the routing through holes are used for enabling optical fibers to pass through the twisting die, a power mechanism is connected with the optical fiber twisting part to drive the optical fiber twisting part to rotate forwards and reversely, and the inner cavity of the central rotating shaft is a through hole so that water-blocking yarns can pass through the inner cavity of the central rotating shaft;
the bundling die is provided with a bundling hole for gathering the water-blocking yarns passing through the optical fiber twisting piece and all the optical fibers together to form a finished yarn, and then the finished yarn enters an extruder;
the static removing device is used for removing static electricity generated by friction of the wire harness;
the extruder is used for extruding the loose tube at the periphery of the wire harness.
2. The system for producing an all-dry type optical unit with high water blocking performance according to claim 1, wherein the torsional mold rotates forward by 270 ° from the initial position and then rotates backward by 270 ° to return to the initial position with the initial position of the torsional mold when the torsional mold is not rotated being 0 °.
3. The system for producing an all-dry type optical unit with high water blocking performance according to claim 1, wherein the material of the loose tube is PBT, PP, TPE or TPEE.
4. The system for producing an all-dry type high water blocking performance optical unit according to claim 1, wherein the loose tube has an outer diameter of 1.2mm to 4.0mm.
5. The system for producing an all-dry high water-blocking performance optical unit according to claim 1, wherein the number of the optical fibers is 2 to 24.
6. The system for producing an all-dry type optical unit with high water blocking performance according to claim 1, wherein the number of the routing through holes is 6-24, and the diameter of the routing through holes is 2 mm-10 mm.
7. A method for producing an all-dry type optical unit with high water-blocking performance, which comprises using the system for producing an all-dry type optical unit with high water-blocking performance as claimed in any one of claims 1 to 6.
8. A method of manufacturing an all-dry high water-blocking optical unit according to claim 7, comprising the steps of:
1) The water blocking yarn and each optical fiber are respectively paid out from a pay-off rack;
2) Each optical fiber respectively passes through one routing through hole on the twisting mold, the water-blocking yarns pass through the central rotating shaft, and then the water-blocking yarns and all the optical fibers are gathered together into a wiring harness through the bundling holes of the bundling mold;
3) The wire harness passes through the static removing device and the extruder and then is connected to the traction device;
4) The traction device pulls the optical fiber to advance, the twisting die rotates forwards and reversely to twist the optical fiber, the extruder extrudes the loose tube to wrap the wire harness, and the optical unit is obtained.
9. An all-dry high water-blocking optical unit produced in accordance with the production system for an all-dry high water-blocking optical unit as claimed in any one of claims 1 to 6, having an outer diameter of 1.2mm to 4.0mm.
10. An optical cable comprising the all-dry type high water-blocking performance optical unit according to claim 9;
when the optical cable is a central tube type optical cable, the optical cable is provided with the full-dry type high-water-resistance optical unit, and an outer sheath is arranged outside the full-dry type high-water-resistance optical unit;
when the optical cable is a layer stranded optical cable, the optical cable is provided with a plurality of full-dry type high water-blocking performance optical units; the optical fiber cable further comprises a central reinforcing piece, the full-dry type high-water-resistance optical units and the central reinforcing piece are twisted to form a cable core, and an outer sheath is arranged on the outer side of the cable core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211511496.XA CN115793161A (en) | 2022-11-29 | 2022-11-29 | Production system, method, product and optical cable of full-dry type high-water-blocking-performance optical unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211511496.XA CN115793161A (en) | 2022-11-29 | 2022-11-29 | Production system, method, product and optical cable of full-dry type high-water-blocking-performance optical unit |
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| Publication Number | Publication Date |
|---|---|
| CN115793161A true CN115793161A (en) | 2023-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211511496.XA Pending CN115793161A (en) | 2022-11-29 | 2022-11-29 | Production system, method, product and optical cable of full-dry type high-water-blocking-performance optical unit |
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| CN (1) | CN115793161A (en) |
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- 2022-11-29 CN CN202211511496.XA patent/CN115793161A/en active Pending
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