CN106448958B - Precast body, core rod of insulator and the preparation method of non-resin winding - Google Patents

Precast body, core rod of insulator and the preparation method of non-resin winding Download PDF

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Publication number
CN106448958B
CN106448958B CN201610941318.9A CN201610941318A CN106448958B CN 106448958 B CN106448958 B CN 106448958B CN 201610941318 A CN201610941318 A CN 201610941318A CN 106448958 B CN106448958 B CN 106448958B
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winding
core rod
precast
insulator
thickness
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CN106448958A (en
Inventor
陈铃飞
赵卫生
胡平
郝春功
李安睿
靳婷婷
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Beibao Power Composite Co., Ltd.
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Beijing FRP Research and Design Institute Composite Co Ltd
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00Insulators or insulating bodies characterised by their form
    • H01B17/38Fittings, e.g. caps; Fastenings therefor
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00Insulators or insulating bodies characterised by their form
    • H01B17/14Supporting insulators
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B19/00Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B19/00Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
    • H01B19/04Treating the surfaces, e.g. applying coatings

Abstract

The invention discloses core rod of insulator precast body, core rod of insulator and the preparation method of a kind of non-resin winding.The core rod of insulator precast body of the present invention includes inner core rod and is wrapped in unique winding layer of the inner core rod outer surface;Described winding layer is formed by non-resin winding;Described winding layer includes the first winding group and the second winding group, and the winding angle of the first winding group is 4 °~8 °, and the winding angle of the second winding group is 82 °~87 °, and the thickness proportion of the first winding group and the second winding group is 3~5:1;The first described winding group and the second described winding group are alternately arranged;The thickness of the winding layer is 90~150mm;Described dry yarn is the glass fibre for being not impregnated with resin, and its fiber number is 500~9600tex.The precast body of the present invention can obtain the of a relatively high core rod of insulator of intensity.The preparation method process of the present invention is reasonable, and production efficiency is high.

Description

Precast body, core rod of insulator and the preparation method of non-resin winding
Technical field
The present invention relates to a kind of precast body of non-resin winding, core rod of insulator and preparation method, more particularly to it is a kind of big straight Precast body, core rod of insulator and the preparation method of the non-resin winding in footpath.
Background technology
The support insulator of existing power transmission and transformation adds silicon rubber umbrella skirt type, the additional silicon rubber of composite inner core including porcelain core Full skirt type etc..It is Nian Jie with ceramic core loosely that porcelain core adds silicon rubber umbrella skirt t shore insulator external shed silastic material to be present, production The phenomenon of anger bubble, influence electric property and the life-span of product.With the raising of power transmission and transformation voltage class, outside composite inner core The dosage accounting of silicon rubber umbrella skirt t shore insulator is added to increase therewith.
The plug of the additional silicon rubber umbrella skirt t shore insulator of composite inner core is made of composite, due to diameter It is larger, for pultrude process it is difficult to a pultrusion.The molding mode that the plug of support insulator uses at present is mostly various The small drawing and extruding bar of specification bundles carry out overall perfusion, but such a technique exists due to more thinner inner core rod structures Adhesive linkage is excessive, occupies larger area ratio in the cross-sectional area of plug, in solidification process it is internal produce it is larger interior Stress, the defects of unbalanced stress causes inside to crack, preferable using effect is extremely difficult in actual use.Pillar The plug of insulator can also be molded in the following way:Inside is pultrusion plug, and outer layer is wound several times.This shaping Although mode can meet actual operation requirements, production efficiency is relatively low, and outer layer, which need to carry out repeatedly winding, need to repeatedly solidify, It is more for the procedure calls in winding process, and it is larger to consume energy, and substantially increases the manufacturing cost of product.In addition, fiber exists There is the mechanical property that certain abrasion can substantially reduce plug in winding process.
CN1731539A discloses a kind of preparation method of glass fiber impregnating resin wound-type composite insulator core: By glass fibre by the resin based sols after fusing, in rotating speed, 150 revs/min stir;Glass fibre and epoxy resin-matrix Continuous winding solidify afterwards are molded solution at high temperature.The above method uses glass fibre as winding material, and needs repeatedly to twine Around low production efficiency, waste of material are big.
Therefore, there is an urgent need to a kind of precast body, core rod of insulator and preparation method, it can effectively improve production efficiency, And the high composite post insulator of bending property can be produced.
The content of the invention
It is an object of the present invention to provide a kind of core rod of insulator precast body, and it can be used for producing bending property High composite post insulator.
It is another object of the present invention to provide a kind of preparation method of core rod of insulator precast body, its process is reasonable, Production efficiency is high.
It is yet a further object of the present invention to provide a kind of preparation method of core rod of insulator, and it can quickly produce big straight The core rod of insulator in footpath, its process is reasonable, and production cost is relatively low.
Inventors herein have recognized that, it is not necessary to using the glass fibre of impregnating resin, the dry yarn of glass fibre is directly twined It is wound on inner core rod and forms precast body, then can produces the high composite post insulator of bending property, it is achieved thereby that Above-mentioned purpose.
The present invention provides a kind of core rod of insulator precast body, and described precast body includes inner core rod and is wrapped in the inner core rod Unique winding layer of outer surface;Described winding layer is formed by non-resin winding;Described winding layer includes the first winding group and the Two winding groups, the winding angle of the first winding group is 4 °~8 °, and the winding angle of the second winding group is 82 °~87 °, and first twines The thickness proportion of winding and the second winding group is 3~5:1;The first described winding group and the second described winding group are alternately arranged Row;The thickness of the winding layer is 90~150mm;Described dry yarn is the glass fibre for being not impregnated with resin, its fiber number is 500~ 9600tex.The precast body of the present invention includes inner core rod and unique winding layer.The winding layer is wrapped in the inner core rod outer surface, And it is brought into close contact with inner core rod.The winding layer is formed by non-resin winding.According to the present invention precast body, described glass fibre Fiber number can be 500~9600tex;Preferably, the fiber number of described glass fibre is 1000~2000tex;It is highly preferred that institute The fiber number for the glass fibre stated is 1100~1800tex.
According to the precast body of the present invention, the winding angle of the first winding group can be 4 °~8 °, preferably 4 °~6 °, More preferably 4 °~5 °;The winding angle of the second winding group can be 82 °~87 °, preferably 83 °~86 °.Described first The thickness proportion of winding group and the second winding group can be 3~5:1, preferably 3.5~4.5:1.According to of the invention a kind of preferred Embodiment, the thickness proportion of the first winding group and the second winding group is 4:1.The present invention is using dry yarn as winding material Material, and using specific winding Rotating fields, the angle and thickness proportion of particularly specific winding group so that core rod of insulator Bending property does not reduce, and i.e. plastic only by once winding.
According to the precast body of the present invention, it is preferable that the thickness of the first winding group is 5~15mm, second winding The thickness of group is 1~4mm.It is highly preferred that the thickness of the first winding group is 6~12mm, the thickness of the second winding group For 1~3.5mm.More preferably, the thickness of the first winding group is 8~10mm, the thickness of the second winding group for 1.5~ 2mm.Due to the canoe and thickness proportion using the present invention so that the bending strength of core rod of insulator is improved, and It is only i.e. plastic by once winding.
According to the precast body of the present invention, described unique winding layer includes multiple first winding groups and the second winding Group, and the first winding group and the second winding group are alternately arranged, the quantity of winding group determines according to the thickness being actually needed of plug. Preferably, described unique winding layer includes 8~25 the first winding groups and 8~25 the second winding groups, it is highly preferred that this is twined Winding layer includes 15~20 the first winding groups and 15~20 the second winding groups.
According to the precast body of the present invention, the thickness of described winding layer can be 90~150mm, preferably 95~130mm, More preferably 100~120mm.
According to the precast body of the present invention, the diameter of the inner core rod can be 80~150mm.The structure of the present invention is especially suitable The plug of major diameter is closed, therefore, it is highly preferred that the inner core rod(Such as drawing and extruding bar)A diameter of 100~115mm.
According to the precast body of the present invention, it is preferable that the outer surface of described inner core rod has screw thread, the depth of the screw thread For 0.3mm~0.6mm, the pitch of the screw thread is 1.5mm~5.5mm.It is highly preferred that the depth of the screw thread be 0.35mm~ 0.6mm, the pitch of the screw thread is 3mm~5mm.
According to the precast body of the present invention, a diameter of 280~350mm of the precast body;Preferably 290~300mm.
According to the present invention precast body, it is preferable that on the basis of the weight of the precast body, the dry yarn account for 65wt%~ 80wt%, more preferably 70wt%~75wt%.
According to the precast body of the present invention, it is preferable that be not provided with tack coat between the inner core rod and the winding layer.
The present invention also provides a kind of preparation method of core rod of insulator precast body, comprises the following steps:
1)Surface treatment step:The outer surface of inner core rod is subjected to blasting treatment, then using volatile organic solvent It is surface-treated, so as to form the inner core rod after surface treatment;The pressure of compressed air is used by the blasting treatment 0.5~1.0MPa, the time of the blasting treatment is 30~60min;
2)Winding step:Dry yarn is directly wound on the inner core rod after surface treatment and forms winding layer, it is pre- so as to obtain Body processed;Wherein, described dry yarn is the glass fibre for being not impregnated with resin;
Wherein, described winding layer includes the first winding group and the second winding group, and the winding angle of the first winding group is 4 ° ~8 °, the winding angle of the second winding group is 82 °~87 °, and the thickness proportion of the first winding group and the second winding group is 3~5: 1;The first described winding group and the second described winding group are alternately arranged;The thickness of the winding layer is 90~150mm.
According to the preparation method of the precast body of the present invention, it is preferable that the volatile organic solvent is selected from acetone, wine Essence, methanol, ether, the one or more of chloroform;Used by the blasting treatment pressure of compressed air be 0.6~ 0.8MPa, the time of the blasting treatment is 25~35min.
The present invention also provides a kind of preparation method of core rod of insulator, comprises the following steps:
1)Surface treatment step:The outer surface of inner core rod is subjected to blasting treatment, then using volatile organic solvent It is surface-treated, so as to form the inner core rod after surface treatment;The pressure of compressed air is used by the blasting treatment 0.5~1.0MPa, the time of the blasting treatment is 30~60min;
2)Winding step:Dry yarn is directly wound on the inner core rod after surface treatment and forms winding layer, it is pre- so as to obtain Body processed;Wherein, described dry yarn is the glass fibre for being not impregnated with resin;Described winding layer twines including the first winding group and second Winding, the winding angle of the first winding group is 4 °~8 °, and the winding angle of the second winding group is 82 °~87 °, and the first winding group Thickness proportion with the second winding group is 3~5:1;The first described winding group and the second described winding group are alternately arranged;Institute The thickness for stating winding layer is 90~150mm;
3)Vacuum injection molding step:The precast body is placed in mould, will using vacuum injection molding technique Gradually to impregnate the plug precast body in the described mould of epoxy resin injection, so as to obtain impregnating;The shaping The relative degree of vacuum of mould is maintained at -0.08~-0.1MPa, and the injection rate of epoxy resin is 250~650g/min, asphalt mixtures modified by epoxy resin The injection of fat and return time are 2~6h;
4)Curing schedule:Mould containing the impregnating is closed, solidification equipment is placed in and carries out solidification process, institute The solidification process stated can be divided into three phases, and the first stage is to solidify 4~5h at 57~60 DEG C, second stage be 67~ Solidify 5~6h at 70 DEG C, the phase III is to solidify 5~6h at 77~80 DEG C.
Whole description will be carried out to the preparation method of the preparation method of precast body and core rod of insulator below.
In the surface treatment step 1 of the present invention)In, the outer surface of inner core rod is subjected to blasting treatment.At so-called sandblasting Reason is exactly that sand is sprayed on to the outer surface of inner core rod using compressed air, can be roughened the outer surface, and can be removed outer The resin-rich layer on surface.Then, it is surface-treated using volatile organic solvent, the impurity of outer surface can be removed.Root According to the specific embodiment of the present invention, the outer surface of inner core rod is subjected to blasting treatment, removes the resin-rich layer on surface simultaneously The outer surface of inner core rod is roughened, then the outer surface of inner core rod is scrubbed and dried with alcohol.In being so advantageous to Plug is Nian Jie with the material that the later stage is molded firmly.In the present invention, the volatile organic solvent can be selected from acetone, wine Essence, methanol, ether, the one or more of chloroform;The pressure of compressed air is 0.5~1MPa used by the blasting treatment, Preferably 0.6~0.8MPa, the time of the blasting treatment is 30~60min, preferably 30~50min.According to the present invention's One preferred embodiment, in surface treatment step 1)In, a diameter of 100~105mm of the inner core rod;It is described volatile Organic solvent is selected from acetone or alcohol;The pressure of compressed air is 0.6~0.8MPa used by the blasting treatment, the spray The time of sand processing is 30~35min.
In the winding step 2 of the present invention)In, dry yarn is directly wound on the inner core rod after surface treatment, obtained prefabricated Body.The parameters such as non-resin winding mode, dry yarn fiber number, winding angle, thickness as it was previously stated, repeat no more here.
In the vacuum injection molding step 3 of the present invention)In, the precast body is placed in mould, then will shaping Mould matched moulds.Epoxy resin is injected in described mould followed by vacuum injection molding technique.Epoxy resin from into The glue-feeder injection of pattern tool, gradually impregnates the plug precast body, so as to obtain impregnating;Unnecessary epoxy resin then from into The gum outlet outflow of pattern tool.According to the specific embodiment of the present invention, the relative degree of vacuum of the mould is kept In -0.08~-0.1MPa, the injection rate of epoxy resin is 250~650g/min, and injection and the return time of epoxy resin are 2~6h;Preferably, the relative degree of vacuum of the mould is maintained at -0.085~-0.095MPa, the injection of epoxy resin Speed is 350~450g/min, and injection and the return time of epoxy resin are 2~6h.In the present invention, described epoxy resin One or more in following resin:Bisphenol A type epoxy resin, bisphenol f type epoxy resin, more phenolic glycidol ether rings Oxygen tree fat, aliphatic glycidyl ether epoxy resin.The epoxy resin of the present invention is preferably bisphenol A type epoxy resin, such as CYD-128 epoxy resin(Hunan Province Yueyang Ba Ling petrochemical industry chemical company).According to a preferred embodiment of the invention, it is described Epoxy resin including 100 parts by weight Hunan Province Yueyang Ba Ling petrochemical industry chemical company produce CYD-128 epoxy resin, 70~ The methyl tetrahydro phthalic anhydride curing agent of 80 parts by weight, Jiaxing Lian Xing new chemical materialses Co., Ltd of 0.8~1.0 parts by weight produce DMP-30 accelerator, the BYK-A530 defoamers of 0.2~0.3 parts by weight(German Bi Ke chemical companies production).
In the curing schedule 4 of the present invention)In, described solidification process can be divided into three phases, and the first stage is 57 Solidify 4~5h at~60 DEG C, second stage is to solidify 5~6h at 67~70 DEG C, and the phase III is to solidify 5 at 77~80 DEG C ~6h.According to the specific embodiment of the present invention, the first stage is to solidify 4~4.5h at 60 DEG C, second stage be Solidify 5~5.5h at 70 DEG C, the phase III is to solidify 5~5.5h at 80 DEG C.
After above-mentioned curing schedule, the inner core rod after solidification can be stripped, the post processing such as Surface Machining, from And form composite post insulator product.
The dry yarn of glass fibre is directly wound on inner core rod by the present invention forms precast body, and then can produces bending The high composite post insulator of performance.Present invention omits the step of glass fiber impregnated resin, thus technique is more reasonable, carries High production efficiency, and production cost is lower.The present invention is by using specific winding angle and twines winding construction, simultaneously The stability of dry yarn and the intensity of core rod of insulator are taken into account.During using structure of the invention so that dry yarn is in elastic stretching Stable state, winding is stable, is not susceptible to slide yarn, and the precast body of gained can obtain the of a relatively high insulator core of intensity Rod.
Brief description of the drawings
Fig. 1 is the structural representation of the pultrusion inner core rod of the present invention;
Fig. 2 is the structural representation of the precast body of the present invention.
Description of reference numerals is as follows:
1 is inner core rod, and 2 be winding layer.
Embodiment
With reference to specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to This.
The raw material used in following examples and comparative example is described in detail below:
Embodiment 1
Fig. 1 is the structural representation of the pultrusion inner core rod of the present invention.The outer surface of the inner core rod of the present invention has screw thread, institute The depth for stating screw thread is 0.6mm, pitch 3.5mm.Fig. 2 is the structural representation of the core rod of insulator precast body of the present invention.This The precast body of invention includes inner core rod 1 and unique winding layer 2.Winding layer 2 is wrapped in the outer surface of inner core rod outer 1.Inner core rod 1 A diameter of 105mm, length 2.5m.Winding layer 2 is directly entwined by the dry yarn of glass fibre that fiber number is 1000tex, is not required to To use the glass fibre of impregnating resin.Winding layer 2 includes 10 the first winding groups and 10 the second winding groups being alternately arranged, The winding angle of first winding group is 4 °, thickness 8mm;The winding angle of second winding group is 87 °, thickness 2mm.Winding layer 2 thickness is 100mm.A diameter of 305mm of precast body.On the basis of the weight of precast body, the quality of the dry yarn of glass fibre contains Measure as 70wt%.
The preparation method of core rod of insulator precast body and core rod of insulator is explained in detail below.
1)The outer surface of pultrusion inner core rod is subjected to blasting treatment, removes the resin-rich layer of exterior surface;And cleaned with alcohol Outer surface, remove its surface impurity.
2)By non-resin winding to step 1)Precast body is formed on inner core rod after processing.
3)By step 2)Obtain precast body to be placed in vacuum injection molding mould, carried out after matched moulds using vacuum injection technique Injecting glue is molded, and the relative degree of vacuum of vacuum injection molding mould is maintained at -0.085MPa, and the injection rate of epoxy resin is 400g/min, injection and the return time of epoxy resin are 5h.
4)After injecting glue, the gum outlet of vacuum injection molding mould and glue inlet are closed, is put into curing oven and carries out Solidification;Curing cycle is 60 DEG C of solidification 4h, and 70 DEG C of solidification 5h, then 80 DEG C solidify 5h.
5)After solidification, it is stripped, Surface Machining forms insulator product.
Products obtained therefrom is subjected to performance test, as a result referring to table 1.
Embodiment 2
Using a diameter of 100mm, length is the inner core rod of 2.5m inner core rod alternative embodiment 1;By in embodiment 1 The winding angle of one winding group replaces with 8 °, and the winding angle of the second winding group replaces with 82 °, remaining condition and parameter and implementation Example 1 is identical, obtains the core rod of insulator precast body of embodiment 2.Products obtained therefrom is subjected to performance test, as a result referring to table 1.
Comparative example 1
1)Choose the solid pultrusion insulation mandrel of a diameter of 105mm, long 2.5m;Its outer surface is subjected to blasting treatment, removed The resin-rich layer of outer surface;And outer surface is cleaned with alcohol, remove its surface impurity.
2)Wind for the first time:Before winding, winding epoxy resin is dipped in solid pultrusion insulation mandrel external coating with hair rolling Epoxy resin.Start to wind glass fibre, winding angle is divided into two kinds:5 °, 85 °, the winding thickness accounting of two kinds of angles is 7: 1.It is 220mm to be wound to diameter of mandrel for the first time, stops winding.
3)First time curing process:70 DEG C of solidification 2h, 90 DEG C of solidification 2h, then 120 DEG C solidify 3h.
4)Second of winding:Plug outer surface after first time curing process is subjected to blasting treatment, goes exterior surface Resin-rich layer;And outer surface is cleaned with alcohol, remove its surface impurity.Start second to wind, winding angle is divided into two kinds: 5 °, 85 °, the winding thickness accounting of two kinds of angles is 7:1.It is 305mm to be wound to diameter of mandrel for the second time, stops winding.
5)Second of curing process:70 DEG C of solidification 2h, 90 DEG C of solidification 2h, then 120 DEG C solidify 3h.
6) plug after second of curing process is machined, is 305mm by diameter of mandrel Vehicle Processing.
Products obtained therefrom is subjected to performance test, as a result referring to table 1.
Table 1
The present invention is not limited to above-mentioned embodiment, in the case of without departing substantially from the substantive content of the present invention, this area skill Any deformation, improvement, the replacement that art personnel are contemplated that each fall within the scope of the present invention.

Claims (6)

1. a kind of preparation method of core rod of insulator, it is characterised in that comprise the following steps:
1) surface treatment step:The outer surface of inner core rod is subjected to blasting treatment, then carried out using volatile organic solvent Surface treatment, so as to form the inner core rod after surface treatment;Used by the blasting treatment pressure of compressed air be 0.5~ 1.0MPa, the time of the blasting treatment is 30~60min;
2) winding step:Dry yarn is directly wound on the inner core rod after surface treatment and forms winding layer, so as to obtain precast body, Described precast body includes inner core rod and is wrapped in unique winding layer of the inner core rod outer surface;Described dry yarn is to be not impregnated with setting The glass fibre of fat, its fiber number are 1000~2000tex;Described winding layer includes the first winding group and the second winding group, the The winding angle of one winding group is 6 °~8 °, and the winding angle of the second winding group is 82 °~83 °, and the first winding group and second The thickness proportion of winding group is 3.5~4.5:1;The thickness of the first winding group is 8~10mm, the thickness of the second winding group Spend for 1.5~2mm;The first described winding group and the second described winding group are alternately arranged;The thickness of the winding layer is 90 ~150mm;Wherein, it is not provided with tack coat between the inner core rod and the winding layer;On the basis of the weight of the precast body, The mass content of the dry yarn is 65wt%~80wt%;
3) vacuum injection molding step:The precast body is placed in mould, using vacuum injection molding technique by epoxy Gradually to impregnate the precast body in the described mould of resin injection, so as to obtain impregnating;The phase of the mould It is maintained at -0.08~-0.1MPa to vacuum, the injection rate of epoxy resin is 250~650g/min, the injection of epoxy resin It is 2~6h with return time;Wherein, described epoxy resin includes Hunan Province Yueyang Ba Ling petrochemical industry chemical industry public affairs of 100 parts by weight Take charge of the CYD-128 epoxy resin, the methyl tetrahydro phthalic anhydride curing agent of 70~80 parts by weight, Jiaxing of 0.8~1.0 parts by weight of production The DMP-30 accelerator of Lian Xing new chemical materialses Co., Ltd production and the German Bi Ke chemical companies life of 0.2~0.3 parts by weight The BYK-A530 defoamers of production;
4) curing schedule:Mould containing the impregnating is closed, solidification equipment is placed in and carries out solidification process, it is described Solidification process is divided into three phases, and the first stage is to solidify 4~5h at 57~60 DEG C, and second stage is solid at 67~70 DEG C Change 5~6h, the phase III is to solidify 5~6h at 77~80 DEG C.
2. preparation method according to claim 1, it is characterised in that the winding layer includes 8~25 the first winding groups With 8~25 the second winding groups.
3. preparation method according to claim 1, it is characterised in that the thickness of described winding layer is 90~130mm, institute A diameter of 80~the 150mm for the inner core rod stated.
4. preparation method according to claim 1, it is characterised in that a diameter of 280~350mm of the precast body.
5. preparation method according to claim 1, it is characterised in that the outer surface of described inner core rod has screw thread, institute The depth for stating screw thread is 0.3mm~0.6mm, and the pitch of the screw thread is 1.5mm~5.5mm.
6. preparation method according to claim 1, it is characterised in that:The volatile organic solvent is selected from acetone, wine Essence, methanol, ether, the one or more of chloroform.
CN201610941318.9A 2016-10-25 2016-10-25 Precast body, core rod of insulator and the preparation method of non-resin winding Active CN106448958B (en)

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CN110060826A (en) * 2019-06-09 2019-07-26 山东厚俞实业有限公司 Core rod of insulator precast body, core rod of insulator and the insulator with this plug
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