CN112712946A - Preparation method of composite core for optical fiber insulator - Google Patents
Preparation method of composite core for optical fiber insulator Download PDFInfo
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- CN112712946A CN112712946A CN202011582596.2A CN202011582596A CN112712946A CN 112712946 A CN112712946 A CN 112712946A CN 202011582596 A CN202011582596 A CN 202011582596A CN 112712946 A CN112712946 A CN 112712946A
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- optical fiber
- core body
- pultrusion
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- protection tool
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
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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
Abstract
The invention discloses a preparation method of a composite core body for an optical fiber insulator, which comprises the following steps: firstly, fixing an optical fiber isolation protection tool in a pultrusion core body die; secondly, enabling the optical fiber to penetrate through an optical fiber isolation protection tool and a pultrusion core body die, and winding an optical fiber protection layer on the optical fiber; and thirdly, wrapping the optical fiber coated with the optical fiber protective layer in the center of the glass fiber, and then leading out from the pultrusion core body die to obtain the composite core body. According to the invention, the optical fiber isolation protection tool is fixed in the pultrusion core body die, the optical fiber protection layer is wound on the optical fiber, then the glass fiber impregnated with the epoxy resin glue solution passes through, the optical fiber coated with the optical fiber protection layer is clamped and fixed in the center of the glass fiber, the optical fiber is synchronously and directly implanted in the pultrusion process of the glass fiber, the phenomena of optical fiber fracture, optical fiber coating layer damage or insulation sealing failure are avoided, the optical fiber is protected, the energy of the optical wave is ensured not to be lost, and the practicability of the composite core body is improved.
Description
Technical Field
The invention belongs to the technical field of optical fiber insulators, and particularly relates to a preparation method of a composite core for an optical fiber insulator.
Background
With the development of the power industry, particularly the development of extra-high voltage power transmission and transformation, higher requirements are put forward on test equipment in a power system. The traditional electromagnetic transformer has the defects of large loss, poor response characteristic of high-frequency signals and the like, and is difficult to meet the requirements of an ultra/extra-high voltage power system. The optical current sensor has the advantages of strong anti-electromagnetic interference capability, high safety performance and the like, and can meet the requirements of high-voltage, high-current and real-time live measurement. The all-fiber current sensor uses the optical fiber as an information transmission channel, so that in order to avoid interference of external signals on signals transmitted by the optical fiber, the optical fiber needs an optical fiber composite insulator to provide external insulation in the process of transmitting current.
The preparation method of the existing optical fiber composite insulator mainly comprises the following two steps: the first method is that an epoxy glass fiber composite insulating tube is used as a carrier to fix optical fibers and improve mechanical strength, the optical fibers are implanted into the center of the insulating tube in the manufacturing process, a silicon rubber umbrella skirt is pressed on the outer wall of the composite insulating tube, and the optical fiber composite insulating tube is manufactured in a mode of flange connection at the end part; the second method is to use an epoxy glass fiber composite insulating bar as a carrier to fix optical fibers and improve mechanical strength, wherein in the manufacturing process, a groove is formed in the surface of the bar, the optical fibers are embedded in the groove, then a silicon rubber umbrella skirt is pressed on the surface of a core rod, and the end part of the core rod is connected through a flange. The optical fiber composite insulator manufactured by the two methods has the following common defects: insulation sealing exists between the cavity inside the insulating tube or the slotting part of the insulating rod and the surface of the optical fiber, and no matter encapsulation or filling is adopted, the insulation sealing fails due to the difference of thermal expansion coefficients among the carrier material insulating tube or the insulating core rod, the encapsulation or filling material and the optical fiber material; stress is formed in the insulator body, so that the loss of the optical fiber is increased; in the process of embedding and encapsulating the optical fiber, the coating layer of the optical fiber is easy to peel off, and the optical fiber is brittle. The qualification rate of manufacturing the optical fiber insulator is reduced under the conditions.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method for preparing a composite core for an optical fiber insulator, aiming at the defects of the prior art. According to the method, an optical fiber isolation protection tool is fixed in a pultrusion core body die, an optical fiber protection layer is wound on an optical fiber, then a glass fiber bundle impregnated with epoxy resin glue solution penetrates through the optical fiber isolation protection tool, the optical fiber coated with the optical fiber protection layer is wrapped and fixed in the center of the glass fiber bundle, the optical fiber is synchronously and directly implanted in the pultrusion process of the glass fiber, and the phenomena of optical fiber breakage, optical fiber coating layer damage or insulation sealing failure are avoided.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a preparation method of a composite core body for an optical fiber insulator is characterized by comprising the following steps:
fixing an optical fiber isolation protection tool in a pultrusion core body die to obtain a processing device;
step two, enabling the optical fiber to pass through the optical fiber isolation protection tool and the pultrusion core body die in the processing device obtained in the step one, guiding the optical fiber protection layer into the optical fiber isolation protection tool and winding the optical fiber protection layer on the optical fiber to obtain a forming device;
thirdly, enabling the glass fiber to pass through the fiber isolation protection tool and the pultrusion core mold in the forming device obtained in the second step, clamping and fixing the optical fiber coated with the fiber protection layer in the center of the glass fiber, then leading out the glass fiber from the pultrusion core mold, positioning the glass fiber at the traction outer end of a tractor, and then drawing out the pultrusion core mold through the tractor to obtain a composite core; the glass fiber is a glass fiber bundle impregnated with epoxy resin glue solution; the composite core body sequentially comprises an optical fiber, an optical fiber protective layer and a glass fiber from inside to outside.
The invention fixes the optical fiber isolation protection tool in the core pulling and extruding mould, then the optical fiber passes through the optical fiber isolation protection tool and the core pulling and extruding mould, winding the optical fiber protective layer on the optical fiber, then passing the glass fiber bundle impregnated with the epoxy resin glue solution between the optical fiber isolation protection tool and the pultrusion core body mold, clamping and fixing the optical fiber coated with the optical fiber protective layer at the center of the glass fiber bundle, and then the fiber, the fiber protection layer and the glass fiber are integrally compounded and manufactured by performing cross-linking curing temperature aging through a core pulling and extruding die, so that the glass fiber impregnated with epoxy resin glue solution wraps and fixes the fiber wrapping the fiber protection layer in a central structure area of the composite core, extrusion curing molding of the composite core is realized along with pulling and extruding of the tractor, and continuous pulling and extruding production of the composite core for the fiber insulator is completed.
The preparation method of the composite core body for the optical fiber insulator is characterized in that in the first step, the optical fiber isolation protection tool comprises a shell, a guide hole is formed in the head of the shell, a ball shaft sleeve is installed at the tail of the shell, a hollow rotating shaft is installed in the ball shaft sleeve, an optical fiber guide hole is reserved in the center of the hollow rotating shaft, a conical hollow guide roller is fixedly installed on the ball shaft sleeve, an installation frame is arranged on the shell, a micro motor is arranged on the installation frame, an output shaft of the micro motor is connected with a driving wheel shaft which is externally tangent to the ball shaft sleeve, and an optical fiber protection layer guide hole is formed in the tail of the shell; the length of the optical fiber isolation protection tool is 2/3-3/4 of the length of the pultrusion core body die. According to the invention, the optical fiber guide hole is reserved on the hollow rotating shaft on the optical fiber isolation protection tool, so that the optical fiber passes through the hollow guide roller, the optical fiber protection layer is guided in through the optical fiber protection layer guide hole and is wound on the outer surface of the hollow guide roller, the hollow guide roller is driven by the micro motor to rotate, the optical fiber protection layer is uniformly wound on the surface of the optical fiber in a traction manner to form a whole and is guided out from the guide outlet, the optical fiber protection layer is wound on the optical fiber, the protection layer is arranged between the optical fiber and the glass fiber to protect the optical fiber, and the energy of the; according to the invention, the optical fiber protective layer is led in through the optical fiber protective layer leading-in port, the optical fiber isolation protection tool is installed through the installation frame, and the micro motor is fixed at the same time; the invention meets the position requirement of the distance between the leading-out hole of the optical fiber isolation protection tool and the outlet of the pultrusion core body die by controlling the length of the optical fiber isolation protection tool, can not influence the leading-in of the core body glass fiber due to the installation of the optical fiber isolation protection tool in the installation process, and can facilitate the leading-in of the optical fiber.
The preparation method of the composite core body for the optical fiber insulator is characterized in that in the first step, the pultrusion core body mold sequentially comprises a preheating region, a molding region and a curing region from left to right, wherein the temperature of the preheating region is 90-105 ℃, the temperature of the molding region is 120-135 ℃, and the temperature of the curing region is 155-165 ℃; the optical fiber isolation protection tool is inserted into the left side of the pultrusion core die, the distance between the derivation hole of the optical fiber isolation protection tool and the right end face of the pultrusion core die is 1/2-2/3 of the length of the pultrusion core die, and the axis of the optical fiber isolation protection tool coincides with the axis of the pultrusion core die. The invention enables the glass fiber bundle impregnated with the epoxy resin glue solution to absorb the heat provided by the pultrusion core mould in the preheating zone, the glass fiber bundle impregnated with the epoxy resin glue solution enters a semi-gel state through the preheating zone of the pultrusion core mould, realizes the seepage and no flowing in a small area, realizes the effective bonding of the epoxy resin glue solution to the optical fiber coating protective layer, avoids the flowing of the epoxy resin glue solution polluting the tool for the optical fiber coating protective layer, clamps and fixes the optical fiber coating optical fiber protective layer and the glass fiber bundle at the central position of the core body at the position of the leading-out hole of the optical fiber isolation protective tool, respectively finishes the gelation and solidification process of the epoxy resin glue solution in the molding zone and the solidification zone, converts the epoxy resin glue solution of composite material macromolecules into a reticular structure through polymerization reaction in the molding zone, enters the gel state to lose the fluidity, and reaches the gel, the epoxy resin glue solution is not fluid but has no strength, the epoxy resin glue solution is crosslinked in a curing area, the fluidity is lost and certain bonding strength is provided, the optical fiber and the glass fiber with the optical fiber protective layer attached to the surface are bonded and converted into a whole by the epoxy resin glue solution along with the change process of the chemical change process and the physical state of the resin glue solution in the process that the epoxy resin glue solution is mixed from a resin curing agent and the like and is completely cured into a crosslinked network structure through a gelling reaction, the epoxy resin glue solution is completely cured to form a network structure, the shaping of a composite core body structure is realized, and the smooth proceeding of the preheating, shaping and curing processes is ensured by controlling the temperature of a preheating area, a shaping area and a curing area; according to the invention, the optical fiber isolation protection tool is inserted from the left side of the pultrusion core body die, so that the optical fiber isolation protection tool is mainly inserted into the preheating zone and the molding zone, and the molding is facilitated; according to the invention, the distance between the outlet hole of the optical fiber isolation protection tool and the outlet of the pultrusion core die is controlled, so that epoxy resin glue liquid impregnated on glass fibers passes through the preheating zone and the front half section of the molding zone, the preheating is completed, the glass fibers enter the semi-gel to lose fluidity, the optical fiber leading-out hole of the optical fiber isolation protection tool is not polluted, and meanwhile, the epoxy resin glue liquid has certain adhesiveness to realize the bonding compounding of the optical fiber core; the invention ensures the coaxiality of the optical fiber and the coating of the protective layer by controlling the coincidence of the axis of the optical fiber isolation protection tool and the axis of the pultrusion core body die, thereby ensuring the performance of the composite core body.
The preparation method of the composite core body for the optical fiber insulator is characterized in that in the step one, the optical fiber is made of glass fiber optical fibers or plastic fiber optical fibers. The invention is suitable for preparing the composite core body by the optical fibers made of various materials, protects the optical fibers made of various materials and prevents the surrounding environment from damaging the optical fibers.
The preparation method of the composite core body for the optical fiber insulator is characterized in that in the second step, the optical fiber protective layer is a rubber tape or a plastic film. According to the invention, the material of the optical fiber protective layer is controlled, so that the optical fiber protective layer prevents the optical fiber peripheral material from damaging the optical fiber to influence the light wave conduction, and a toughness barrier layer is manufactured between the optical fiber and the glass fiber, so that the weak energy loss in the light wave conduction process is effectively absorbed, and the insulation damage of the light wave loss energy to the composite core body is avoided.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the optical fiber wrapped with the optical fiber protective layer is synchronously and directly implanted in the pultrusion process of the epoxy glass fiber bundle, so that the optical fiber is sealed and molded at one time, and the phenomena of optical fiber breakage, optical fiber coating layer damage or insulation sealing failure can not occur when the composite core body is prepared into an optical fiber insulator; according to the invention, the optical fiber is used as a light wave conduction carrier of the composite core body, the optical fiber protective layer is wrapped on the outer layer of the optical fiber, the toughness barrier layer is manufactured, the weak energy loss in the light wave conduction process is effectively absorbed, and the epoxy glass fiber is wrapped on the outer side of the optical fiber protective layer, so that the damage of the surrounding environment to the optical fiber is prevented.
2. According to the invention, the optical fiber protective layer is uniformly wound on the surface of the optical fiber in a traction and winding manner through the optical fiber isolation protection tool to form a whole, so that the protective layer is arranged between the optical fiber and the glass fiber to protect the optical fiber, the energy of the optical wave is ensured not to be lost, and the practicability of the composite core body is improved.
3. The glass fiber is used as the framework layer to fix the optical fiber and provide mechanical strength for the composite core, the diameter of the optical fiber is small, even if the outer surface of the optical fiber is wrapped by the optical fiber protective layer to form a whole, the optical fiber has certain tensile strength, the requirements of the optical fiber insulator on comprehensive performance such as stretching, bending and torsion resistance and the like can not be met, the optical fiber is implanted into the center of the glass fiber, and the requirements of the electrical engineering on the mechanical performance of the composite core are met by means of the mechanical strength of the glass fiber framework such as stretching, bending and torsion resistance and the like.
4. The invention effectively utilizes the reaction heat of the epoxy resin glue solution, realizes the thermal fusion of the optical fiber, the optical fiber protective layer and the glass fiber in the pultrusion core body die, effectively overcomes the damage to the optical fiber caused by heating in the manufacturing process of the composite core body, ensures that the temperature of the center of the composite core body and the thermal fusion junction temperature of the optical fiber protective layer are kept consistent or slightly higher than the thermal fusion junction temperature of the optical fiber protective layer in the manufacturing process, and realizes the protection of the optical fiber.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic view of the fiber isolation protection tool and the pultrusion core mold in the present invention.
Fig. 2 is a schematic structural diagram of the optical fiber isolation protection tool of the present invention.
Fig. 3 is a left side view of fig. 2.
FIG. 4 is a schematic structural view of a composite core of the present invention.
Description of reference numerals:
1, an optical fiber isolation protection tool; 1-housing; 1-2-a lead-out hole;
1-3-ball bearing sleeve; 1-4-hollow rotating shaft; 1-5-optical fiber leading-in hole;
1-6-hollow leading-in roller; 1-7-mounting rack; 1-8-micromotor;
1-9-driving wheel axle; 1-10-optical fiber protective layer leading-in port; 2, pultrusion of a core die;
2-1-a preheating zone; 2-a forming zone; 2-3-a curing zone;
3-an optical fiber; 4-optical fiber protective layer; 5-glass fiber.
Detailed Description
As shown in fig. 1, 2 and 3, the optical fiber insulation protection tool of the present invention includes a housing 1-1, the head of the shell 1-1 is provided with a leading-out hole 1-2, the tail of the shell 1-1 is provided with a ball bearing shaft sleeve 1-3, a hollow rotating shaft 1-4 is arranged in the ball bearing shaft sleeve 1-3, an optical fiber lead-in hole 1-5 is reserved in the center of the hollow rotating shaft 1-4, a conical hollow leading-in roller 1-6 is fixedly arranged on the ball bearing shaft sleeve 1-3, the shell 1-1 is provided with a mounting rack 1-7, the mounting rack 1-7 is provided with a micro motor 1-8, the output shaft of the micromotor 1-8 is connected with a driving wheel shaft 1-9 which is circumscribed with the ball bearing shaft sleeve 1-3, an optical fiber protective layer introducing port 1-10 is formed in the tail part of the shell 1-1; the pultrusion core body die 2 is sequentially provided with a preheating area 2-1, a molding area 2-2 and a curing area 2-3 from left to right, the optical fiber isolation protection tool 1 is inserted from the left side of the pultrusion core body die 2, and the axis of the optical fiber isolation protection tool 1 coincides with the axis of the pultrusion core body die 2.
As shown in fig. 4, the composite core of the present invention comprises an optical fiber, an optical fiber protective layer and a glass fiber in sequence from inside to outside.
Example 1
The embodiment comprises the following steps:
fixing an optical fiber isolation protection tool 1 in a pultrusion core body die 2 through mounting frames 1-7 to obtain a processing device; the length of the pultrusion core body die 2 is 900mm, and the inner diameter is 50 mm; the length of the optical fiber isolation protection tool 1 is 2/3 of the length of the pultrusion core body die 2, and the diameter of the leading-out hole 1-2 is 3 mm; the temperature of the preheating zone 2-1 is 90-95 ℃, the temperature of the forming zone 2-2 is 120-127 ℃, and the temperature of the curing zone 2-3 is 155-157 ℃; the distance between the leading-out hole 1-2 of the optical fiber isolation protection tool 1 and the right end face of the pultrusion core body die 2 is 1/2 of the length of the pultrusion core body die 2;
step two, the optical fiber 3 penetrates into the processing device obtained in the step one from an optical fiber leading-in hole 1-5 and penetrates out from a leading-out hole 1-2, then the optical fiber passes through a pultrusion core body die 2, then an optical fiber protective layer 4 is led in from an optical fiber protective layer leading-in hole 1-10 and is wound on a hollow leading-in roller 1-6, a micro motor 1-8 is started, a driving wheel shaft 1-9 drives a ball shaft sleeve 1-3 to drive the hollow leading-in roller 1-6 to rotate, and the optical fiber protective layer 4 is wound on the optical fiber 3 to obtain a forming device; the optical fiber 3 is a polycarbonate plastic optical fiber with the diameter of 1000 mu m; the optical fiber protective layer 4 is a tough high-temperature thermal polycondensation ethylene film;
thirdly, enabling the glass fiber 5 to pass through the fiber isolation protection tool 1 and the pultrusion core mold 2 in the forming device obtained in the second step, clamping and fixing the optical fiber 3 coated with the optical fiber protection layer 4 in the center of the glass fiber 5 bundle, then leading out from the pultrusion core mold 2, positioning the optical fiber at the traction outer end of a traction machine, and then drawing out the pultrusion core mold 2 through the traction machine to obtain a composite core; the glass fiber 5 is a glass fiber bundle impregnated with epoxy resin glue solution; the composite core body comprises an optical fiber 3, an optical fiber protective layer 4 and a glass fiber 5 from inside to outside in sequence; the traction speed of the tractor is 8 cm/min.
The composite core prepared in this example was tested to have a diameter of 50mm, a tensile strength of 950MPa, and a flexural strength of 830 MPa.
Example 2
The embodiment comprises the following steps:
fixing an optical fiber isolation protection tool 1 in a pultrusion core body die 2 through mounting frames 1-7 to obtain a processing device; the length of the pultrusion core body die 2 is 900mm, and the inner diameter is 35 mm; the length of the optical fiber isolation protection tool 1 is 3/4 of the length of the pultrusion core body die 2, and the diameter of the leading-out hole 1-2 is 5 mm; the pultrusion core body die 2 sequentially comprises a preheating zone 2-1, a forming zone 2-2 and a curing zone 2-3 from left to right, wherein the temperature of the preheating zone 2-1 is 95-103 ℃, the temperature of the forming zone 2-2 is 127-131 ℃, and the temperature of the curing zone 2-3 is 157-159 ℃; the optical fiber isolation protection tool 1 is inserted from the left side of the pultrusion core body die 2, the distance between the leading-out hole 1-2 of the optical fiber isolation protection tool 1 and the right end face of the pultrusion core body die 2 is 7/12 of the length of the pultrusion core body die 2, and the axis of the optical fiber isolation protection tool 1 is overlapped with the axis of the pultrusion core body die 2;
step two, the optical fiber 3 penetrates into the processing device obtained in the step one from an optical fiber leading-in hole 1-5 and penetrates out from a leading-out hole 1-2, then the optical fiber passes through a pultrusion core body die 2, then an optical fiber protective layer 4 is led in from an optical fiber protective layer leading-in hole 1-10 and is wound on a hollow leading-in roller 1-6, a micro motor 1-8 is started, a driving wheel shaft 1-9 drives a ball shaft sleeve 1-3 to drive the hollow leading-in roller 1-6 to rotate, and the optical fiber protective layer 4 is wound on the optical fiber 3 to obtain a forming device; the optical fiber 3 is an 50/125 mu m single-mode fluorine-doped multimode graded-index optical fiber; the optical fiber protective layer 4 is a thermal shrinkage self-adhesive butadiene-acrylonitrile rubber tape;
thirdly, enabling the glass fiber 5 to pass through the fiber isolation protection tool 1 and the pultrusion core mold 2 in the forming device obtained in the second step, clamping and fixing the optical fiber 3 coated with the optical fiber protection layer 4 in the center of the glass fiber 5 bundle, then leading out from the pultrusion core mold 2, positioning the optical fiber at the traction outer end of a traction machine, and then drawing out the pultrusion core mold 2 through the traction machine to obtain a composite core; the glass fiber 5 is a glass fiber bundle impregnated with epoxy resin glue solution; the composite core body comprises an optical fiber 3, an optical fiber protective layer 4 and a glass fiber 5 from inside to outside in sequence; the traction speed of the tractor is 12 cm/min.
The composite core prepared in this example was tested to have a diameter of 35mm, a tensile strength of 1035MPa, and a flexural strength of 930 MPa.
Example 3
The embodiment comprises the following steps:
fixing an optical fiber isolation protection tool 1 in a pultrusion core body die 2 through mounting frames 1-7 to obtain a processing device; the length of the pultrusion core body die 2 is 1200mm, and the inner diameter is 70 mm; the length of the optical fiber isolation protection tool 1 is 17/24 of the length of the pultrusion core body die 2, and the diameter of the leading-out hole 1-2 is 6 mm; the pultrusion core body die 2 sequentially comprises a preheating zone 2-1, a forming zone 2-2 and a curing zone 2-3 from left to right, wherein the temperature of the preheating zone 2-1 is 103-105 ℃, the temperature of the forming zone 2-2 is 131-135 ℃, and the temperature of the curing zone 2-3 is 159-165 ℃; the optical fiber isolation protection tool 1 is inserted from the left side of the pultrusion core body die 2, the distance between the leading-out hole 1-2 of the optical fiber isolation protection tool 1 and the right end face of the pultrusion core body die 2 is 2/3 of the length of the pultrusion core body die 2, and the axis of the optical fiber isolation protection tool 1 is overlapped with the axis of the pultrusion core body die 2;
step two, the optical fiber 3 penetrates into the processing device obtained in the step one from an optical fiber leading-in hole 1-5 and penetrates out from a leading-out hole 1-2, then the optical fiber passes through a pultrusion core body die 2, then an optical fiber protective layer 4 is led in from an optical fiber protective layer leading-in hole 1-10 and is wound on a hollow leading-in roller 1-6, a micro motor 1-8 is started, a driving wheel shaft 1-9 drives a ball shaft sleeve 1-3 to drive the hollow leading-in roller 1-6 to rotate, and the optical fiber protective layer 4 is wound on the optical fiber 3 to obtain a forming device; the optical fiber 3 is an 50/125 mu m single-mode fluorine-doped multimode graded-index optical fiber; the optical fiber protective layer 4 is a tough high-temperature thermal polycondensation vinyl chloride plastic film;
thirdly, enabling the glass fiber 5 to pass through the fiber isolation protection tool 1 and the pultrusion core mold 2 in the forming device obtained in the second step, clamping and fixing the optical fiber 3 coated with the optical fiber protection layer 4 in the center of the glass fiber 5 bundle, then leading out from the pultrusion core mold 2, positioning the optical fiber at the traction outer end of a traction machine, and then drawing out the pultrusion core mold 2 through the traction machine to obtain a composite core; the glass fiber 5 is a glass fiber bundle impregnated with epoxy resin glue solution; the composite core body comprises an optical fiber 3, an optical fiber protective layer 4 and a glass fiber 5 from inside to outside in sequence; the traction speed of the tractor is 5 cm/min.
The composite core prepared in this example was tested to have a diameter of 70mm, a tensile strength of 1235MPa, and a flexural strength of 1050 MPa.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (5)
1. A preparation method of a composite core body for an optical fiber insulator is characterized by comprising the following steps:
fixing an optical fiber isolation protection tool (1) in a pultrusion core body die (2) to obtain a processing device;
step two, enabling the optical fiber (3) to pass through the optical fiber isolation protection tool (1) and the pultrusion core body die (2) in the processing device obtained in the step one, and guiding the optical fiber protection layer (4) into the optical fiber isolation protection tool (1) to be wound on the optical fiber (3) to obtain a forming device;
thirdly, enabling the glass fiber (5) to pass through the fiber isolation protection tool (1) and the pultrusion core body die (2) in the forming device obtained in the second step, wrapping and fixing the fiber (3) coated with the fiber protection layer (4) in the center of the glass fiber (5), then leading out from the pultrusion core body die (2), positioning the fiber at the outer traction end of a tractor, and pulling out the pultrusion core body die (2) through the tractor to obtain a composite core body; the glass fiber (5) is a glass fiber (5) bundle impregnated with epoxy resin glue solution; the composite core body sequentially comprises an optical fiber (3), an optical fiber protective layer (4) and a glass fiber (5) from inside to outside.
2. The preparation method of the composite core body for the optical fiber insulator according to claim 1, wherein in the first step, the optical fiber isolation protection tool (1) comprises a shell (1-1), the head of the shell (1-1) is provided with a leading-out hole (1-2), the tail of the shell (1-1) is provided with a ball shaft sleeve (1-3), a hollow rotating shaft (1-4) is installed in the ball shaft sleeve (1-3), the center of the hollow rotating shaft (1-4) is provided with an optical fiber leading-in hole (1-5), the ball shaft sleeve (1-3) is fixedly provided with a conical hollow leading-in roller (1-6), the shell (1-1) is provided with a mounting frame (1-7), and the mounting frame (1-7) is provided with a micro-motor (1-8), an output shaft of the micromotor (1-8) is connected with a driving wheel shaft (1-9) externally tangent to the ball bearing shaft sleeve (1-3), and the tail part of the shell (1-1) is provided with an optical fiber protective layer introducing port (1-10); the length of the optical fiber isolation protection tool (1) is 2/3-3/4 of the length of the pultrusion core body die (2).
3. The method for preparing the composite core for the optical fiber insulator, according to the claim 2, is characterized in that the pultrusion core mold (2) in the first step is sequentially a preheating zone (2-1), a molding zone (2-2) and a curing zone (2-3) from left to right, the temperature of the preheating zone (2-1) is 90 ℃ to 105 ℃, the temperature of the molding zone (2-2) is 120 ℃ to 135 ℃, and the temperature of the curing zone (2-3) is 155 ℃ to 165 ℃; the optical fiber isolation protection tool (1) is inserted into the left side of the pultrusion core body die (2), the distance between an exit hole (1-2) of the optical fiber isolation protection tool and the right end face of the pultrusion core body die (2) is 1/2-2/3 of the length of the pultrusion core body die (2), and the axis of the optical fiber isolation protection tool (1) coincides with the axis of the pultrusion core body die (2).
4. The method for preparing a composite core for an optical fiber insulator according to claim 1, wherein the optical fiber (3) in the first step is made of a glass fiber (3) or a plastic fiber (3).
5. The method for preparing a composite core for an optical fiber insulator according to claim 1, wherein the optical fiber protective layer (4) in the second step is a rubber tape or a plastic film.
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| CN112712946B CN112712946B (en) | 2022-05-17 |
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