CN107887087A - A kind of composite insulator umbrella skirt preparation method Nian Jie with sheath - Google Patents
A kind of composite insulator umbrella skirt preparation method Nian Jie with sheath Download PDFInfo
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- CN107887087A CN107887087A CN201710967576.9A CN201710967576A CN107887087A CN 107887087 A CN107887087 A CN 107887087A CN 201710967576 A CN201710967576 A CN 201710967576A CN 107887087 A CN107887087 A CN 107887087A
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- Prior art keywords
- sheath
- full skirt
- skirt
- composite insulator
- bonding interface
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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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- 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
- H01B17/38—Fittings, e.g. caps; Fastenings therefor
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Abstract
The invention discloses a kind of composite insulator umbrella skirt preparation method Nian Jie with sheath, the physical dimension and adhesive of full skirt and sheath bonding interface matching part are determined first, the adhesion technique of full skirt and sheath bonding interface is determined again, pass through the technological equipment of autocracy, the full skirt bonding plane full of adhesive will be handled well, firmly set is bonded on sheath, sulfidization molding part, then determines the switching performance and its stability of composite insulator umbrella skirt and sheath bonding interface；Its full skirt height Nian Jie with sheath is higher by 100% than external insulating strength by interior insulation intensity and chosen, and full skirt chooses Interference size tolerance fit with sheath bonding interface；Its process for integrally manufacturing is simple, and the composite insulator umbrella skirt prepared through experiment measure this method is Nian Jie with sheath firm, stably, the adhesive strength and stability of prior art full skirt and sheath is greatly improved, suitable for large batch of production.
Description
Technical field
The present invention relates to line insulator technical field, the preparation Nian Jie with sheath of specially a kind of composite insulator umbrella skirt
Method.
Background technology
Composite insulator is the line insulator of new organic insulation construction, its insulator one with other material-structures
Sample, good insulation system performance is all should ensure that under any circumstance.At present, composite insulator research department and production unit
Most attention, material-structure is completely different, and the plug that performance differs larger is coupled interface with sheath, all takes corresponding technology to arrange
Apply, the insulation system performance for being allowed to interface is ensured.But for the bonding interface between composite insulator sheath and multiple full skirts
Insulation system performance, people always consider on sheath that some, there is Nian Jie bad phenomenon, simply slightly subtracts with full skirt bonding interface
The creep age distance of few product, too big influence is not formed on the lending analysis of product.But it is absolute to be strict with product quality
Do not allow.
First should be according to composite insulator sheath and full skirt bonding interface design feature, with reference to sheath and the material of full skirt for this
Matter structural behaviour, find out the full skirt best fit size Nian Jie with composite insulator sheath and rational sheath and the viscous work of full skirt set
Skill.Then, by analysis and actual verification, the stability of full skirt and sheath bonding interface performance is determined.
The content of the invention
It is an object of the invention to provide a kind of composite insulator umbrella skirt preparation method Nian Jie with sheath, and it makes letter
Single, science is reliable, stable performance, suitable for the production in enormous quantities of composite insulator in the market, to solve above-mentioned background
The problem of being proposed in technology.
To achieve the above object, the present invention provides following technical scheme：A kind of composite insulator umbrella skirt is Nian Jie with sheath
Preparation method, comprise the following steps：
S1：Determine the physical dimension of full skirt and sheath bonding interface matching part；
S2：Determine the adhesive of full skirt and sheath bonding interface matching part；
S3：The adhesion technique of full skirt and sheath bonding interface is determined based on step S1, S2；
S4：Using the technological equipment of autocracy, the full skirt bonding plane full of adhesive will be handled well, firmly set is bonded on sheath, sulphur
Change profiled part；
S5：The switching performance and its stability of measuring composite insulator umbrella skirt and sheath bonding interface.
Preferably, the determination of the step S1 is divided into following process：
S1.1：Full skirt belongs to interior insulation with sheath bonding interface, and its full skirt minimum altitude Nian Jie with sheath is according to interior insulation intensity
Higher than external insulating strength 100% is selected；
S1.2：The full skirt of composite insulator uses identical siloxane polymer to be molded for main material cures with sheath, belongs to
In high resiliency molecular structure part, fit structure size should choose Interference size tolerance fit between its full skirt and sheath.
Preferably, the adhesive in the step S2 should be chosen in certain limit using silicon rubber as base material silicone-containing molecule
The material of amount, and choose treated white carbon reinforcing agent and zinc oxide compounding ingredient and prepared as additive.
Preferably, the adhesion technique in the S3 is divided into following steps：
S3.1：Remove full skirt and coordinate two surface pure siloxane bodily form network structures with sheath, make surface reinforcing agent silica particles
Expose to play strengthening action, the thickness that removes of its full skirt and sheath matching surface is no less than 1.3jxm；
S3.2：According to the physical property of full skirt material, it is distributed with reference to full skirt modular construction features of shape and full skirt on sheath
Actual conditions are assembled, developing a kind of full skirt that bore can be made small by comprehensive analysis is relatively easy to be sleeved on sheath, and can
Meet that the set adhering process equipment of adhesive glue is enriched in the full skirt bore inner chamber of each position on sheath.
Preferably, measuring includes the full skirt bonded with sheath bonding interface tear by force in the step S5
Experiment and full skirt are spent with sheath using steady involved by the compression or tensile elasticity deformation for being interference fitted in corresponding site formation
Qualitative test and full skirt carry out 200h boilings ageing properties according to plug boiling test parameter with sheath bonding interface and tested.
Compared with prior art, the beneficial effects of the invention are as follows：
This composite insulator umbrella skirt preparation method Nian Jie with sheath, full skirt height Nian Jie with sheath are more exhausted than outer by interior insulation intensity
Edge intensity is higher by 100% and chosen, and full skirt chooses Interference size tolerance fit with sheath bonding interface, and full skirt glues with sheath
The adhesive in border face chooses treated white carbon reinforcing agent and zinc oxide with the material of silica gel alkane molecular weight in certain limit
The additives such as compounding ingredient are prepared, and by the technological equipment of autocracy, the full skirt bonding plane full of adhesive is handled well, firmly
Set is bonded on sheath, sulfidization molding part；Its process for integrally manufacturing is simple, the composite insulator prepared through experiment measure this method
Full skirt is Nian Jie with sheath firm, stably, the adhesive strength and stability of prior art full skirt and sheath is greatly improved, suitable for big
The production of batch.
Embodiment
The embodiment of the present invention is will be detailed below, however, the embodiment of the present invention is not limited thereto.Based in the present invention
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made,
Belong to the scope of protection of the invention.
In the embodiment of the present invention：A kind of composite insulator umbrella skirt preparation method Nian Jie with sheath, comprises the following steps：
The first step：Determine the physical dimension of full skirt and sheath bonding interface matching part；Composite insulator umbrella skirt is increase insulation
Surface creepage distance, the insulating element of product surface flashover is prevented, it is by using silicon rubber as base material, filling multiple additives pass through
It is kneaded by mold cure and what is be molded, for the full skirt that the flexible material of this poor rigidity is formed, meets product
The requirement of external insulation surface creepage distance, it can only be distributed in the full skirt of more respective diameters on product sheath to realize, so,
More full skirt and sheath bonding interface are certainly existed along composite insulator length, it is ensured that all viscous on product sheath
The insulating properties in border face.
First, Nian Jie with sheath to full skirt highly should correctly be selected；Full skirt is to belong to interior exhausted with sheath bonding interface
Edge, the selection of full skirt minimum altitude Nian Jie with sheath, external insulation should be compared in accordance with the interior insulation intensity in external insulation matching relationship
Intensity is higher by 50%, then 10% margin of safety requirement progress is reserved by longtime running, but is provided in view of composite insulator standard
The factors such as highest steep wave proof strength are likely to occur, full skirt minimum altitude Nian Jie with sheath should compare external insulation according to interior insulation intensity
Intensity high 100% is selected, and the interior insulation intensity of its full skirt and sheath bonding interface should be with used adhesive glue insulating properties
Checked.
Secondly, by the determination to composite insulator umbrella skirt internal orifice and sheath fit dimension tolerance, the full skirt of composite insulator
All it is to use identical siloxane polymer to be molded for main material cures with sheath, is to belong to high resiliency molecular structure portion
Part；In order to make full use of the physical property of high resiliency part, by increasing interface room machine tessellation, molecule between interface is increased
Absorption property and the mode for promoting interfacial molecular chemical bond generation intermolecular with adhesive glue, to improve cementability between full skirt and sheath
Can, fit structure size should use interference fit tolerance between full skirt and sheath, and this is also external composite insulator research institution
With production producer, carry out analyzing the ripe warp for verifying that the caliber size for determining full skirt should be slightly smaller than sheath diameter
Test；For full skirt and sheath interference fit tolerance concrete numerical value, will be hit by a bullet the reality that has become according to full skirt and sheath bonding process
Border is acted on, it is contemplated that full skirt process implementing is set with sheath, occurs playing varying stress and relaxing at full skirt bore position not influenceing boundary
Chosen on the basis of the performance of face bonding site, external composite insulator umbrella skirt and the specific number of sheath interference fit tolerance
Value, is that positive compression caused by jacket surface is determined with full skirt inside diameter surface, the general all 0.1MPa or so of its value.
Second step：Determine the adhesive of full skirt and sheath bonding interface matching part；Full skirt and sheath are all with silicon rubber
For the part of main material cures shaping, the adhesive prepared using silicon rubber by base material must be used between them；With
During silicone rubber adhesive processed, it is necessary to carry out suitable choosing to the siloxane molecule amount for preparing the silastic material used in adhesive
Select, only siloxane molecule amount control within the specific limits could existing good adhesion, have larger cohesive force again, with protect
Card interface has preferable adhesive strength；The reinforcing agent filled about adhesive, it should use by the white of special process processing
Carbon black, therefore ensure that silica particles more uniform distribution plays the effect of function node in siloxane polymer molecule interchain, promote
Siloxane polymer molecule segment normal erect type spin state is present, and rolled state seldom occurs, is uniformly carried with segment stress deformation
High interface binding intensity；Zinc oxide should be taken as compounding ingredient is added in adhesive, zinc is amphotere, and it is in adhesive
Generated in soluble Zn, can rapidly with white carbon surface react, it delays the polycondensation in its sizing material, adds bonding
Siloxane molecule is reacted with interfacial adhesion in agent, improves interface bonding strength, such as adhesive removing zinc oxide, can make bonding
Agent is reduced equivalent to the binder levels without white carbon reinforcing agent.
3rd step：The adhesion technique of full skirt and sheath bonding interface is determined based on step 1 and step 2；Composite insulator
The full skirt and sheath of full skirt and sheath bonding site, all it is that to use identical silicon rubber be the outside diameter inspection of base material through individual curing
Profiled part, because the reinforcing agent silica particles outer surface hydroxyl in outside diameter inspection and the middle of anti-structural agent act on,
So that parts surface is there is certain thickness siloxane molecule bodily form network structure, if full skirt and the surface mechanical performance of sheath two
Extremely low siloxane molecule bodily form network structure is directly bonded, and will necessarily directly affect full skirt and sheath bonding interface switching performance；
Thus full skirt coordinates two surfaces to remove surface pure siloxane bodily form network structure by processing mode, make surface with sheath
Reinforcing agent silica particles are exposed to play strengthening action, and its full skirt and sheath matching surface remove thickness and should not be less than
1.3jxm。
The set of composite insulator umbrella skirt and sheath glues process, is that easy flowing is coated in surface by handling qualified sheath
It is sleeved on like the adhesive glue of canopy shape, then the full skirt for handling internal orifice well on sheath, this is for the umbrella with sheath using interference fit
Skirt is during set is viscous, if use general set adhering process, except occurring, full skirt bore is too small to be not easy to be sleeved on sheath
Phenomenon outside, and when full skirt sheath be distributed installing it is mobile when be also difficult to enter effect of the interface adhesive property there is adhesive glue
Disadvantage；Thus problem encountered on the viscous sheath of full skirt set, it is necessary to solved using the set adhering process of full skirt and sheath equipment
Certainly；By being according to the physical property of full skirt material, with reference to full skirt modular construction during its set adhering process equipment is developed
Features of shape, it is contemplated that full skirt is distributed assembling actual conditions on sheath, is carried out by comprehensive analysis, makes to develop to cover and glues
The full skirt that technological equipment can make bore small is relatively easy to be sleeved on sheath, and and can meets the full skirt mouth of each position on sheath
Adhesive glue is enriched in footpath inner chamber, ensures the various performances of full skirt and sheath bonding interface.
4th step：Using technological equipment autocratic in step 3, the full skirt bonding plane full of adhesive will be handled well, firmly
Set is bonded on sheath, sulfidization molding part；
5th step：The switching performance and its stability of measuring composite insulator umbrella skirt and sheath bonding interface；Compound inslation
Sub- full skirt is all to be formulated the outside diameter inspection prepared using silica gel as base material as using with sheath, takes same process parameter sulphur
Change what is formed；Full skirt and sheath bonding site surface after PROCESS FOR TREATMENT, although its each superficial layer material-structure with part
Portion's material composition is identical, is all the siloxanes bodily form network molecular structure of the various filling agent particles there is random distribution,
But the siloxane molecule termination that end face will have numerous fracture main chains, these terminations are easy to rise with the siloxane molecule in adhesive
Chemical reaction forms firm chemical bond, and chemical bond is the interatomic gravitation in molecule, and it is than general intermolecular Van der Waals force
The high 1-2 order of magnitude, chemical bond is formed between this interface and is not only provided compared with high-adhesive-strength, and adhesive interface is resisted each
Kind ageing properties are contributive, in the various Tian Chong Ji Teeth grains of the random distribution shown for its end face, diameter phase
It is essentially all what is do not existed in its surface agent processing procedure when the filler Teeth grains of big not salience(-cy), and end face
Remaining is that reinforcing agent hard charcoal Shu Teeth are granular, and the hydroxyl on its exposed position surface is easy to compare model with siloxane molecule in adhesive
Hydrogen bond connection much bigger De Huali, this can also effectively improve the adhesive strength at interface.
The bonding interface of composite insulator umbrella skirt and sheath is in using adhering process equipment progress assembling process is covered, then because of umbrella
Interference fit between skirt and sheath makes to pile with substantial adhesive on interface and will acted on all the time by positive compression, will be obvious
Bonding interface adhesive property is improved, uneven polysiloxane network point is necessarily presented in each surface of treated bonding site
Minor structure state, its each position of polysiloxane network molecular structure will be penetrated into by adhesive on the surface of positive action of compressive stress,
Acceleration is broken the siloxane molecule termination of main chain with it and is connected, and promotes siloxane molecule chemical bond interlinkage on interface fully, to avoid
Interface siloxanes molecular chemistry key interlinkage is incomplete caused by the difference of adhesive flow infiltration, at the same on surface adhesive by
To the effect of positive compression, the segment of siloxane molecule and molecular link and its siloxane network in adhesive can be made intermolecular
Distance Shortened, Van der Waals force between adding molecular improve the adhesive property at interface.
Test and tear strength test is carried out to the full skirt bonded and sheath bonding interface, it tears disconnection position and not gone out
On present bonding interface, but occur in the inside by component interface；In the industry once to silicon rubber umbrella skirt and silicone rubber jacket
Bonding interface carries out the experiment of tensile strength, show that with the mechanically decoupled bonding interface be unlikely, unless exceeding silicon rubber
The conclusion of the fracture strength of glue, this external shed also have good electrical insulation properties with sheath bonding interface；Composite insulator
The bonding interface performance of full skirt and sheath, because with excellent stability can full skirt or sheath component inner materials form and by
Power state difference, is analyzed with respect to its stability influence degree, and relevant material forms the white carbon reinforcement in difference
Agent, what adhesive was selected is granular white carbon, and it is to pass through special work as the aggregation chain common white carbon black used in part
Obtained after skill processing, its reinforcing effect and its stability are necessarily better than the corresponding material-structure performance of components interior, simultaneously
The adhesive of interior insulation effect is played, is free from the quite big Tian Chong Ji Teeth grains of numerous diameters in the presence of part material, this also may be used
To effectively improve the stability of interface bonding strength and insulating properties.
Test for full skirt and sheath using involved by the compression or tensile elasticity deformation for being interference fitted in corresponding site formation
And the stability test arrived, due to gluing the full skirt assembled and the corresponding site of sheath interference fit according to process stipulation set, all
It is made up of the netted siloxane molecule of the bodily form, the bond angle of siloxane molecule is big, bond length length, there is effective screen of methyl on side chain again
Cover so that form the bodily form it is netted in molecular state all spirally exist, when this molecular state bodily form network structure by
When pressure or tension, molecule Lei rotation shape deformations can only be caused, after its deflection is extremely divided equally because of molecule, be for each molecule more
It is atomic small, also relate only to bond angle change and the only a few of molecular link, so its corresponding site is pressurized or tension
Elastic deformation deformation is extremely slow, as the situation of the stress relaxation of structure caused by corresponding site elastic deformation, then because
Helical molecular little change can only cause the faint change of internal stress and structure provides the interior energy of considerable bullet change to put down
Weighing apparatus so that corresponding site is pressurized or the bullet varying stress relaxation of tension can be ignored.
Experiment carries out 200h boilings ageing properties according to plug boiling test parameter to full skirt and sheath bonding interface and tested,
The tearing strength at interface is also higher than the tearing strength of part after it is tried, and leakage current changes with leakage current before examination without obvious,
It is external that also once the bonding interface of the furrow rubber and silicon rubber of the silicon rubber to non-binding interface and 0.1MPa compression carried out voltage
Insulation breakdown comparative trial of life-span, the voltage insulation breakdown life characteristic change curve between its long-time is without obvious poor
Not.
In summary：This composite insulator umbrella skirt preparation method Nian Jie with sheath, full skirt height Nian Jie with sheath is by interior
Dielectric strength is higher by 100% than external insulating strength and chosen, and full skirt is chosen Interference size tolerance with sheath bonding interface and matched somebody with somebody
Close, the adhesive of full skirt and sheath bonding interface treats white carbon with the material of silica gel alkane molecular weight in certain limit, selection
The additive such as reinforcing agent and zinc oxide compounding ingredient is prepared, and by the technological equipment of autocracy, handling well full of adhesive
Full skirt bonding plane, firmly set be bonded on sheath, sulfidization molding part；Its process for integrally manufacturing is simple, and the party is determined through experiment
Composite insulator umbrella skirt prepared by method is Nian Jie with sheath firm, stably, and it is bonding with sheath strong to greatly improve prior art full skirt
Degree and stability, suitable for large batch of production.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of changes, modification can be carried out to these embodiments, replace without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (5)
1. a kind of composite insulator umbrella skirt preparation method Nian Jie with sheath, it is characterised in that comprise the following steps：
S1：Determine the physical dimension of full skirt and sheath bonding interface matching part；
S2：Determine the adhesive of full skirt and sheath bonding interface matching part；
S3：The adhesion technique of full skirt and sheath bonding interface is determined based on step S1, S2；
S4：Using the technological equipment of autocracy, the full skirt bonding plane full of adhesive will be handled well, firmly set is bonded on sheath, sulphur
Change profiled part；
S5：The switching performance and its stability of measuring composite insulator umbrella skirt and sheath bonding interface.
A kind of 2. composite insulator umbrella skirt according to claim 1 preparation method Nian Jie with sheath, it is characterised in that institute
The determination for stating step S1 is divided into following process：
S1.1：Full skirt belongs to interior insulation with sheath bonding interface, and its full skirt minimum altitude Nian Jie with sheath is according to interior insulation intensity
Higher than external insulating strength 100% is selected；
S1.2：The full skirt of composite insulator uses identical siloxane polymer to be molded for main material cures with sheath, belongs to
In high resiliency molecular structure part, fit structure size should choose Interference size tolerance fit between its full skirt and sheath.
A kind of 3. composite insulator umbrella skirt according to claim 1 preparation method Nian Jie with sheath, it is characterised in that institute
The interior material using silicon rubber as base material silicone-containing molecular weight of certain limit should be chosen by stating the adhesive in step S2, and at selection
Managed white carbon reinforcing agent and zinc oxide compounding ingredient is prepared as additive.
A kind of 4. composite insulator umbrella skirt according to claim 1 preparation method Nian Jie with sheath, it is characterised in that institute
The adhesion technique stated in S3 is divided into following steps：
S3.1：Remove full skirt and coordinate two surface pure siloxane bodily form network structures with sheath, make surface reinforcing agent silica particles
Expose to play strengthening action, the thickness that removes of its full skirt and sheath matching surface is no less than 1.3jxm；
S3.2：According to the physical property of full skirt material, it is distributed with reference to full skirt modular construction features of shape and full skirt on sheath
Actual conditions are assembled, developing a kind of full skirt that bore can be made small by comprehensive analysis is relatively easy to be sleeved on sheath, and can
Meet that the set adhering process equipment of adhesive glue is enriched in the full skirt bore inner chamber of each position on sheath.
A kind of 5. composite insulator umbrella skirt according to claim 1 preparation method Nian Jie with sheath, it is characterised in that institute
Stating measuring in step S5 includes carrying out tear strength test and full skirt and shield to the full skirt bonded and sheath bonding interface
Set is using the involved stability test of the compression or tensile elasticity deformation that are interference fitted in corresponding site formation and full skirt
200h boilings ageing properties are carried out with sheath bonding interface according to plug boiling test parameter to test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710967576.9A CN107887087A (en) | 2017-10-17 | 2017-10-17 | A kind of composite insulator umbrella skirt preparation method Nian Jie with sheath |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710967576.9A CN107887087A (en) | 2017-10-17 | 2017-10-17 | A kind of composite insulator umbrella skirt preparation method Nian Jie with sheath |
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| Publication Number | Publication Date |
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| CN107887087A true CN107887087A (en) | 2018-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710967576.9A Pending CN107887087A (en) | 2017-10-17 | 2017-10-17 | A kind of composite insulator umbrella skirt preparation method Nian Jie with sheath |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112759936A (en) * | 2021-01-26 | 2021-05-07 | 醴陵市东方电瓷电器有限公司 | Silicone rubber umbrella skirt for extra-high voltage composite insulator and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458575A (en) * | 2014-12-12 | 2015-03-25 | 国家电网公司 | Test method of bonding strength of composite insulator |
| CN204537769U (en) * | 2015-03-20 | 2015-08-05 | 长园高能电气股份有限公司 | There is between a kind of umbrella sheath and plug the composite insulator of strong bonding force |
-
2017
- 2017-10-17 CN CN201710967576.9A patent/CN107887087A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458575A (en) * | 2014-12-12 | 2015-03-25 | 国家电网公司 | Test method of bonding strength of composite insulator |
| CN204537769U (en) * | 2015-03-20 | 2015-08-05 | 长园高能电气股份有限公司 | There is between a kind of umbrella sheath and plug the composite insulator of strong bonding force |
Non-Patent Citations (1)
| Title |
|---|
| 张福林 等: "复合绝缘子伞裙与护套粘接界面的结构工艺特点及性能稳定性", 《电工陶瓷专业委员会2003年学术交流会论文集》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112759936A (en) * | 2021-01-26 | 2021-05-07 | 醴陵市东方电瓷电器有限公司 | Silicone rubber umbrella skirt for extra-high voltage composite insulator and preparation method thereof |
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Application publication date: 20180406 |