CN111326298B - Inner-filling light extra-high voltage composite insulating cross arm - Google Patents
Inner-filling light extra-high voltage composite insulating cross arm Download PDFInfo
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- CN111326298B CN111326298B CN202010263788.0A CN202010263788A CN111326298B CN 111326298 B CN111326298 B CN 111326298B CN 202010263788 A CN202010263788 A CN 202010263788A CN 111326298 B CN111326298 B CN 111326298B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/56—Insulating bodies
- H01B17/60—Composite insulating bodies
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/40—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes epoxy resins
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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Abstract
The invention discloses an inner-filling light extra-high voltage composite insulating cross arm, which belongs to the technical field of insulating cross arms of electric power facilities and comprises a main cylinder, a left flange, a right flange and an inner filling body; the main cylinder body is an epoxy glass fiber pipe, the left end and the right end of the main cylinder body are respectively connected with the left flange and the right flange, the left flange is connected with the iron tower body, and the right flange is connected with a wire hanging point hardware fitting; the inner filling body is densely filled in a cylindrical space surrounded by the main cylinder body, the left flange and the right flange, and is formed by filling a modified epoxy resin material. The filled light extra-high voltage composite insulating cross arm has light weight and good insulating property, and avoids inflation and saves monitoring work after service.
Description
Technical Field
The invention relates to the technical field of insulating cross arms of electric power facilities, in particular to an inner filling light extra-high voltage composite insulating cross arm.
Background
At present, transmission lines in China are operated in a mode of using traditional iron towers, steel pipe poles and concrete poles to configure steel cross arms and hanging insulator strings, and the problems of heavy weight, difficulty in construction, transportation, operation and maintenance and the like exist. The higher the voltage grade of the power transmission line is, the longer the corresponding insulator string is, so that the height of the iron tower is increased, the steel consumption of the iron tower is increased, and the workload is increased for the daily operation and maintenance work of the power transmission line. At present, the ultra-high voltage transmission line is generally more than 60 meters; the average height of the double-loop 1000 kV line iron tower is about 100 meters. Therefore, the cross arm made of the novel material becomes a new trend in the field of transmission towers. The composite material has the advantages of high strength, light weight, corrosion resistance, easiness in processing, good designability, good insulating property and the like, is more and more favored by the power industry, and is an ideal material for replacing steel materials to manufacture the cross arm. Composite crossarms now in operation mainly include solid and hollow inflatable types. For a single solid insulating cross arm, the manufacturing process difficulty of the insulating cross arm core rod of more than 500kV is large, the manufacturing cost is high, the quality of a finished product is large, and the transportation and the installation are difficult. The inside of the insulating cross arm of the hollow pipe generally adopts filled nitrogen gas as internal insulation, the biggest problem is that the insulating cross arm has the risk of insulation breakdown after air leakage, the safety is not enough, in addition, a barometer must be arranged after the hollow pipe is put into operation, and the monitoring work after the hollow pipe is increased. Therefore, the composite insulating cross arm cannot be popularized on a large scale on a high voltage level.
Therefore, it is necessary to develop a novel inner-filling light-weight extra-high voltage composite insulating cross arm in order to solve the above drawbacks, which is a problem that those skilled in the art need to solve urgently.
Disclosure of Invention
The invention aims to provide an inner-filling light extra-high voltage composite insulating cross arm which is light in weight and good in insulating property, avoids inflation and saves monitoring work after service.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to an inner-filling light extra-high voltage composite insulating cross arm which comprises a main cylinder, a left flange, a right flange and an inner filling body, wherein the left flange is fixedly connected with the left end of the main cylinder; the main cylinder body is an epoxy glass fiber pipe, the left end and the right end of the main cylinder body are respectively connected with the left flange and the right flange, the left flange is connected with the iron tower body, and the right flange is connected with a wire hanging point hardware fitting; the inner filling body is densely filled in a cylindrical space surrounded by the main cylinder body, the left flange and the right flange, and is formed by filling a modified epoxy resin material.
Further, an umbrella skirt sheath is arranged on the outer periphery of the main cylinder, a plurality of umbrella-shaped fins are regularly arranged on the outer side of the umbrella skirt sheath, and two ends of the umbrella skirt sheath extend into the protecting tubes of the left flange and the right flange.
Furthermore, the umbrella skirt sheath is made of vulcanized silicone rubber materials.
Furthermore, a first threaded hole for vacuumizing is formed in the middle of the left flange base plate, and a second threaded hole for filling the modified epoxy resin material is formed in the middle of the right flange base plate.
Furthermore, the first threaded hole and the second threaded hole are both in threaded connection with a plug for sealing.
Further, the inner filling body is prepared by the following method:
a. weighing the following raw materials in parts by weight: 21125-28125 parts of component A; 25000-28000 parts of a component B; 925.5-1100.26 parts of hollow organic microspheres; 461.5-500.5 parts of a silane coupling agent; 231.5-300.5 parts of a defoaming agent; 1265-1525 parts of a dispersing agent; the component A is any one of the following components: triethylene diamine, dimethylamino ethyl ether, stannous octoate and pentamethyl diethylene triamine; the component B is E-51 type epoxy resin; the silane coupling agent is gamma-aminopropyl triethoxysilane; the defoaming agent is any one of the following substances: polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether and polyoxypropylene polyoxyethylene glycerol ether, polydimethylsiloxane; the dispersant is any one of the following: fatty acids, fatty amides or esters;
b. b, preparing modified hollow organic microspheres, mixing the hollow organic microspheres weighed in the step a with a silane coupling agent, and stirring for 5min at the rotating speed of 1000-1500 r/min to obtain the modified hollow organic microspheres;
c. preparing a core filling initial material, uniformly mixing and stirring the component A weighed in the step a and the modified hollow organic microspheres obtained in the step B, then uniformly mixing and stirring the component A and the component B weighed in the step a, then mixing and stirring the mixture with the defoaming agent and the dispersing agent weighed in the step a, and stirring the mixture for 1 to 2 minutes at the rotating speed of 1000 to 1800r/min to obtain the core filling initial material;
d. c, preparing a core filling raw material, standing the core filling initial material obtained in the step c in a vacuum drying oven for 50-80 min, taking out, stirring the core filling initial material at the rotating speed of 1000-1800 r/min for 50-80 s to ensure that the modified hollow organic microspheres are uniformly distributed, and then placing the core filling raw material in the vacuum drying oven for vacuumizing until no bubbles overflow on the surface, so as to obtain the core filling raw material;
e. and (d) preparing a composite insulating cross arm core body, filling the core body filling raw material obtained in the step (d) into a cylindrical space surrounded by the preheated main cylinder body, the left flange and the right flange, curing for more than 12 hours at 65-100 ℃, and curing the core body filling raw material to form an inner filling body.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention relates to an inner filling light extra-high voltage composite insulating cross arm, which is a main cylinder body made of a glass fiber reinforced epoxy resin hollow pipe, has high mechanical strength and can bear larger mechanical load. The inner filler formed by pouring the modified epoxy resin material has small density, high insulating strength, good hydrophobicity and high bonding strength; the core rod material of the solid insulating composite cross arm is avoided, the material utilization rate is improved, the process manufacturing difficulty is reduced, and the cost is effectively reduced; the installation of a barometer of the inflatable insulation composite cross arm is avoided, and the monitoring work after service is saved; meanwhile, the modified epoxy resin material and the glass fiber reinforced epoxy resin hollow tube have good wettability, high bonding strength and few interface defects.
In addition, through the arrangement of the umbrella skirt sheath made of vulcanized silicone rubber materials, two ends of the skirt sheath are inserted into the protecting pipes of the left flange and the right flange in a pressing manner, so that the waterproof capability of the composite insulating cross arm is enhanced, the insulating property is improved, and the service life of equipment is prolonged. Through the arrangement of the first threaded hole and the second threaded hole, when the modified epoxy resin material is poured into the main cylinder body in a vacuum pouring mode, the vacuum pumping equipment and the modified epoxy resin material supply tank are conveniently connected, and material leakage and incomplete filling cannot occur; the cavity of the inner filling body is sealed through the plug, so that impurities and water are prevented from being mixed, and the reduction of the insulating property of the inner filling body is avoided. The inner filler prepared by the method has the advantages that the epoxy resin is combined with the hollow organic microspheres to reduce the filling density, and in addition, the organic microspheres have the characteristics of high closed porosity, control of hygroscopicity and improvement of strong structure, so that the filler provided by the invention has better electrical characteristics. Compared with the traditional polyurethane foaming, the epoxy resin and hollow organic microsphere material has higher dielectric strength and lower dielectric loss, and in addition, has excellent matrix performance and reliable matrix/filler interface bonding performance. Has the characteristics of low pore merging and through-hole rate, high closed-pore rate and low water absorption rate. Thereby improving the corrosion resistance and the ageing resistance of the insulating material and achieving the purpose of improving the internal insulation performance.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a schematic view of a front cross-sectional structure of an inner-filled light extra-high voltage composite insulating cross arm in the invention;
FIG. 2 is a schematic cross-sectional structural view of the filled lightweight ultra-high voltage composite insulating cross arm of the present invention;
description of reference numerals: 1. a main cylinder; 2. a right flange; 201. a first threaded hole; 3. a left flange; 301. a second threaded hole; 4. a shed sheath; 5. an inner filler; 6. and (5) plugging with a thread.
Detailed Description
The core of the invention is to provide the inner-filling light extra-high voltage composite insulating cross arm which has light weight and good insulating property, and avoids inflation and saves monitoring work after service.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The drawings illustrate that, in the following detailed description, the upper, lower, left and right descriptions are provided for the drawings in the specification, and should not be construed as limiting the invention.
Referring to the attached drawings, fig. 1 is a schematic view of a front cross-sectional structure of an inner filling light extra-high voltage composite insulating cross arm in the invention; FIG. 2 is a schematic cross-sectional structure view of the filled lightweight ultra-high voltage composite insulating cross arm of the invention.
In a specific embodiment, as shown in fig. 1 and fig. 2, an internal filling light extra-high voltage composite insulating cross arm comprises a main cylinder 1, a left flange 2, a right flange 3 and an internal filling body 5; the main cylinder body 1 is an epoxy glass fiber pipe, and a glass fiber reinforced epoxy resin hollow pipe is manufactured by adopting a wet winding forming technology; the left end and the right end of the main cylinder body 1 are respectively connected with a left flange 2 and a right flange 3 in a compression joint mode, the left flange 2 is connected with an iron tower body, and the right flange 3 is connected with a wire hanging point hardware fitting; the inner filling body 5 is densely filled in a cylindrical space surrounded by the main cylinder body 1, the left flange 2 and the right flange 3, and the inner filling body 5 is formed by filling a modified epoxy resin material.
The main cylinder body 1 made of the glass fiber reinforced epoxy resin hollow pipe has high mechanical strength and can bear larger mechanical load. The inner filler 5 formed by filling the modified epoxy resin material has small density, high insulating strength, good hydrophobicity and high bonding strength; the core rod material of the solid insulating composite cross arm is avoided, the material utilization rate is improved, the process manufacturing difficulty is reduced, and the cost is effectively reduced; the installation of a barometer of the inflatable insulation composite cross arm is avoided, and the monitoring work after service is saved; meanwhile, the modified epoxy resin material and the glass fiber reinforced epoxy resin hollow tube have good wettability, high bonding strength and few interface defects.
In an embodiment of the present invention, as shown in fig. 1 and 2, a shed sheath 4 is provided around the outer circumference of the main cylinder 1, a plurality of shed-like fins are regularly arranged on the outer side of the shed sheath 4, and both ends of the shed sheath 4 are inserted into and pressed into the sheaths of the left flange 2 and the right flange 3.
Specifically, the shed sheath 4 is made of vulcanized silicone rubber. The composite insulating cross arm adopts the mode that the high-temperature vulcanized silicone rubber material is integrally injected around the outer periphery of the main cylinder body 1, and the forming process adopts integral vacuum injection forming, so that the formed composite insulating cross arm has few defects.
Through the arrangement of the umbrella skirt sheath 4 made of vulcanized silicone rubber materials, two ends of the skirt sheath 4 are inserted into the protecting pipes of the left flange 2 and the right flange 3 in a pressing manner, so that the waterproof capability of the composite insulating cross arm is enhanced, the insulating property is improved, and the service life of equipment is prolonged.
In an embodiment of the invention, as shown in fig. 1, a first threaded hole 201 for vacuum pumping is provided in the middle of the left flange 2 substrate, and a second threaded hole 202 for injecting a modified epoxy resin material is provided in the middle of the right flange 3 substrate.
Specifically, the plug 6 for sealing is screwed into both the first screw hole 201 and the second screw hole 202, and a raw material tape for sealing is wound around the plug 6.
Through the arrangement of the first threaded hole 201 and the second threaded hole 202, when the modified epoxy resin material is poured into the main cylinder body 1 in a vacuum pouring mode, the vacuum pumping equipment and the modified epoxy resin material supply tank are conveniently connected, and material leakage and incomplete filling are avoided; the cavity of the inner filling body 5 is sealed by the plug 6, so that impurities and water are prevented from being mixed, and the reduction of the insulating property of the inner filling body 5 is avoided.
In one embodiment of the present invention, the inner filler 5 is prepared by the following method:
a. weighing the following raw materials in parts by weight: 21125-28125 parts of component A; 25000-28000 parts of a component B; 925.5-1100.26 parts of hollow organic microspheres; 461.5-500.5 parts of a silane coupling agent; 231.5-300.5 parts of a defoaming agent; 1265-1525 parts of a dispersing agent; the component A is any one of the following components: triethylene diamine, dimethylamino ethyl ether, stannous octoate and pentamethyl diethylene triamine; the component B is E-51 type epoxy resin; the silane coupling agent is gamma-aminopropyl triethoxysilane; the defoaming agent is any one of the following substances: polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether and polyoxypropylene polyoxyethylene glycerol ether, polydimethylsiloxane; the dispersant is any one of the following: fatty acids, fatty amides or esters;
b. b, preparing modified hollow organic microspheres, mixing the hollow organic microspheres weighed in the step a with a silane coupling agent, and stirring for 5min at the rotating speed of 1000-1500 r/min to obtain the modified hollow organic microspheres;
c. preparing a core filling initial material, uniformly mixing and stirring the component A weighed in the step a and the modified hollow organic microspheres obtained in the step B, then uniformly mixing and stirring the component A and the component B weighed in the step a, then mixing and stirring the mixture with the defoaming agent and the dispersing agent weighed in the step a, and stirring the mixture for 1 to 2 minutes at the rotating speed of 1000 to 1800r/min to obtain the core filling initial material;
d. c, preparing a core filling raw material, standing the core filling initial material obtained in the step c in a vacuum drying oven for 50-80 min, taking out, stirring the core filling initial material at the rotating speed of 1000-1800 r/min for 50-80 s to ensure that the modified hollow organic microspheres are uniformly distributed, and then placing the core filling raw material in the vacuum drying oven for vacuumizing until no bubbles overflow on the surface, so as to obtain the core filling raw material;
e. and (d) preparing a composite insulating cross arm core, filling the core filling raw material obtained in the step (d) into a cylindrical space surrounded by the preheated main cylinder body 1, the left flange 2 and the right flange 3, curing for more than 12 hours at 65-100 ℃, and curing the core filling raw material to form an inner filling body 5.
Specifically, the physical parameters of the hollow organic microspheres weighed in the step a are as follows: a density of 0.06 to 0.26g/cm3, an average particle diameter of 1 to 100 μm, and a wall thickness of 0.14 to 1.24 μm.
Specifically, in the step a, the raw materials and the parts by weight thereof are weighed as follows: 24600 parts of component A; 26500 parts of component B; 1012.88 parts of hollow organic microspheres; 481 parts of a silane coupling agent; 266 parts of defoaming agent; 1395 parts of dispersing agent.
Compared with the polyurethane foaming material in the prior art, the polyurethane foaming material has low closed cell rate and high water absorption rate, and has serious interface problem when being used as a cross arm filling material. The inner filler 5 prepared by the method has the advantages that the epoxy resin is combined with the hollow organic microspheres to reduce the filling density, and in addition, the organic microspheres have the characteristics of high closed porosity, control of hygroscopicity and improvement of strong structure, so that the filler provided by the invention has better electrical characteristics. Compared with the traditional polyurethane foaming, the epoxy resin and hollow organic microsphere material has higher dielectric strength and lower dielectric loss, and in addition, has excellent matrix performance and reliable matrix/filler interface bonding performance. Has the characteristics of low pore merging and through-hole rate, high closed-pore rate and low water absorption rate. Thereby improving the corrosion resistance and the ageing resistance of the insulating material and achieving the purpose of improving the internal insulation performance.
The filled light ultra-high voltage composite insulating cross arm has the advantages that the main cylinder body 1 made of the glass fiber reinforced epoxy resin hollow pipe is high in mechanical strength and can bear large mechanical load. The inner filler 5 formed by filling the modified epoxy resin material has small density, high insulating strength, good hydrophobicity and high bonding strength; the core rod material of the solid insulating composite cross arm is avoided, the material utilization rate is improved, the process manufacturing difficulty is reduced, and the cost is effectively reduced; the installation of a barometer of the inflatable insulation composite cross arm is avoided, and the monitoring work after service is saved; meanwhile, the modified epoxy resin material and the glass fiber reinforced epoxy resin hollow tube have good wettability, high bonding strength and few interface defects. In addition, through the arrangement of the umbrella skirt sheath 4 made of vulcanized silicone rubber materials, two ends of the skirt sheath 4 are inserted into the protecting pipes of the left flange 2 and the right flange 3 in a pressing manner, so that the waterproof capability of the composite insulating cross arm is enhanced, the insulating property is improved, and the service life of equipment is prolonged. Through the arrangement of the first threaded hole 201 and the second threaded hole 202, when the modified epoxy resin material is poured into the main cylinder body 1 in a vacuum pouring mode, the vacuum pumping equipment and the modified epoxy resin material supply tank are conveniently connected, and material leakage and incomplete filling are avoided; the cavity of the inner filling body 5 is sealed by the plug 6, so that impurities and water are prevented from being mixed, and the reduction of the insulating property of the inner filling body 5 is avoided. The inner filler 5 prepared by the method has the advantages that the epoxy resin is combined with the hollow organic microspheres to reduce the filling density, and in addition, the organic microspheres have the characteristics of high closed porosity, control of hygroscopicity and improvement of strong structure, so that the filler provided by the invention has better electrical characteristics. Compared with the traditional polyurethane foaming, the epoxy resin and hollow organic microsphere material has higher dielectric strength and lower dielectric loss, and in addition, has excellent matrix performance and reliable matrix/filler interface bonding performance. Has the characteristics of low pore merging and through-hole rate, high closed-pore rate and low water absorption rate. Thereby improving the corrosion resistance and the ageing resistance of the insulating material and achieving the purpose of improving the internal insulation performance.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the scope of the present invention is defined by the claims.
Claims (5)
1. The utility model provides an interior compound insulating cross arm of filling light extra-high voltage which characterized in that: comprises a main cylinder body (1), a left flange (2), a right flange (3) and an inner filling body (5); the main cylinder body (1) is an epoxy glass fiber pipe, the left end and the right end of the main cylinder body are respectively connected with the left flange (2) and the right flange (3), the left flange (2) is connected with an iron tower frame body, and the right flange (3) is connected with a wire hanging point fitting; the inner filling body (5) is densely filled in a cylindrical space enclosed by the main cylinder body (1), the left flange (2) and the right flange (3), and the inner filling body (5) is formed by filling a modified epoxy resin material;
the inner filler (5) is prepared by the following method:
a. weighing the following raw materials in parts by weight: 21125-28125 parts of component A; 25000-28000 parts of a component B; 925.5-1100.26 parts of hollow organic microspheres; 461.5-500.5 parts of a silane coupling agent; 231.5-300.5 parts of a defoaming agent; 1265-1525 parts of a dispersing agent; the component A is any one of the following components: triethylene diamine, dimethylamino ethyl ether, stannous octoate and pentamethyl diethylene triamine; the component B is E-51 type epoxy resin; the silane coupling agent is gamma-aminopropyl triethoxysilane; the defoaming agent is any one of the following substances: polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether and polyoxypropylene polyoxyethylene glycerol ether, polydimethylsiloxane; the dispersant is any one of the following: fatty acids, fatty amides or esters;
b. b, preparing modified hollow organic microspheres, mixing the hollow organic microspheres weighed in the step a with a silane coupling agent, and stirring for 5min at the rotating speed of 1000-1500 r/min to obtain the modified hollow organic microspheres;
c. preparing a core filling initial material, uniformly mixing and stirring the component A weighed in the step a and the modified hollow organic microspheres obtained in the step B, then uniformly mixing and stirring the component A and the component B weighed in the step a, then mixing and stirring the mixture with the defoaming agent and the dispersing agent weighed in the step a, and stirring the mixture for 1 to 2 minutes at the rotating speed of 1000 to 1800r/min to obtain the core filling initial material;
d. c, preparing a core filling raw material, standing the core filling initial material obtained in the step c in a vacuum drying oven for 50-80 min, taking out, stirring the core filling initial material at the rotating speed of 1000-1800 r/min for 50-80 s to ensure that the modified hollow organic microspheres are uniformly distributed, and then placing the core filling raw material in the vacuum drying oven for vacuumizing until no bubbles overflow on the surface, so as to obtain the core filling raw material;
e. and (d) preparing a composite insulating cross arm core, filling the core filling raw material obtained in the step (d) into a cylindrical space surrounded by the preheated main cylinder body (1), the left flange (2) and the right flange (3), curing for more than 12 hours at 65-100 ℃, and curing the core filling raw material to form an inner filling body (5).
2. The inner-filled light extra-high voltage composite insulating cross arm of claim 1, which is characterized in that: the umbrella skirt protective sleeve is characterized in that an umbrella skirt protective sleeve (4) is arranged on the outer periphery of the main cylinder body (1), a plurality of umbrella-shaped fins are regularly arranged on the outer side of the umbrella skirt protective sleeve (4), and two ends of the umbrella skirt protective sleeve (4) extend into protective pipes of the left flange (2) and the right flange (3).
3. The inner-filled light extra-high voltage composite insulating cross arm of claim 2, wherein: the umbrella skirt sheath (4) is made of vulcanized silicone rubber materials.
4. The inner-filled light extra-high voltage composite insulating cross arm of claim 1, which is characterized in that: the middle of the base plate of the left flange (2) is provided with a first threaded hole (201) for vacuumizing, and the middle of the base plate of the right flange (3) is provided with a second threaded hole (202) for pouring the modified epoxy resin material.
5. The inner-filled light extra-high voltage composite insulating cross arm of claim 4, wherein: the first threaded hole (201) and the second threaded hole (202) are both in threaded connection with a plug (6) for sealing.
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