CN108331426A - A kind of cross-arm wire fixture and cross-arm - Google Patents
A kind of cross-arm wire fixture and cross-arm Download PDFInfo
- Publication number
- CN108331426A CN108331426A CN201810201520.7A CN201810201520A CN108331426A CN 108331426 A CN108331426 A CN 108331426A CN 201810201520 A CN201810201520 A CN 201810201520A CN 108331426 A CN108331426 A CN 108331426A
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- Prior art keywords
- cross
- arm
- fixed seat
- connector
- insulator
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/24—Cross arms
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/02—Structures made of specified materials
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Insulators (AREA)
Abstract
The present invention discloses a kind of cross-arm wire fixture, it is fixed on cross-arm, the cross-arm wire fixture includes insulator, fixed seat, connector and fastener, insulator and fixed seat are integrally formed, fixed seat and connector cooperatively form vessel, for housing cross-arm, fastener is used to fixed seat and connector being fastened on cross-arm.The invention also discloses a kind of cross-arms, including the cross-arm wire fixture, cross-arm are made of composite material.For the cross-arm wire fixture of the present invention by integrated compression molding, manufacturing process is simple and fast, and avoids and punched on cross-arm, ensures the mechanical property of cross-arm.
Description
Technical field
The present invention relates to distribution transmission line of electricity fields, especially distribution cross-arm lead fixed network.
Background technology
Cross-arm is led for installing insulator and gold utensil for supporting as the important component in electric power line pole tower
Line simultaneously makes to keep certain safe distance between conducting wire.When branch occur in transmission line of electricity and drawing lower beam, there are multilayer cross on bar
Load, lead, which draws lower needs erection wire jumper on cross-arm, fixes branch's lead influences transmission line of electricity to avoid conductor spacing excessively close
Operation, lead, which is fixed on, can also reduce the influence that windage yaw carrys out conductor strip on cross-arm.
Currently, fixed form of the lead on cross-arm is typically to be punched on cross-arm, and the steel feet of pin insulator is inserted into
It is fixed in the hole of cross-arm, other end connecting lead wire, to which lead to be fixed on cross-arm.But punching can influence cross on cross-arm
The mechanical property of load, especially compound cross-arm is gradually widely used in distribution line now, and punching is to cross-arm on cross-arm
Effect on Mechanical Properties is more obvious.Moreover, the manufacture craft of pin insulator also uses the combination of porcelain piece ontology and steel feet substantially
Structure, technique are cumbersome.
Invention content
In view of the deficiencies of the prior art, an object of the present invention is to provide a kind of cross-arm wire fixture, avoids
It punches to ensure higher ability to bear and preferable mechanical property of the cross-arm to load on cross-arm, and the cross-arm lead is solid
It is simple to determine apparatus structure, convenient formation is quick.
For achieving the above object, the technology used in the present invention means are as follows：A kind of cross-arm wire fixture, Gu
It is scheduled on cross-arm, above-mentioned cross-arm wire fixture includes insulator, fixed seat, fastener and connector, insulator and fixation
Seat is integrally formed, and fixed seat and connector complement each other to form the vessel for housing cross-arm, fastener be used for fixed seat and
Connector is fixed on cross-arm.
Above-mentioned cross-arm wire fixture is fixed on by the cooperation of fixed seat, fastener and connector on cross-arm, is avoided
It is punched on cross-arm, ensures that the mechanical property of cross-arm, fixed seat and insulator use integrally formed technique, molding simple in structure
It is convenient.
In one of which embodiment, insulator is vertically arranged with cross-arm in the horizontal plane.This set can increase
Between lead and the distance between lead and conducting wire, it is possible to reduce wind puts the short-circuit risks brought.
In one of which embodiment, fixed seat is arranged at the middle part or end of insulator.
When fixed seat is arranged in the middle part of insulator, cross-arm wire fixture is installed and can be used to fix two and is drawn
Line simplifies structure, facilitates installation；Fixed seat is arranged at the end of insulator, and the other end of insulator is used for anchor leg.
In one of which embodiment, connector and metal material may be used for fixed seat or composite material is made.
Connector and fixed seat using glass fibre as reinforcing material, using epoxy resin as matrix by compression molding,
Glass fibre and epoxy resin itself have electrical insulation properties, and certain mechanical performance can be provided after molding.Insulator is adopted
It is integrally formed with composite material identical with connector, fixed seat, and with fixed seat, convenient formation.Certain fixed seat and connection
Part may be metal material, including stainless steel, aluminium alloy etc., and fixed seat is integrally formed as metal insert and insulator, is led to
The mechanical performance of its own can be enhanced using metal material by crossing, to ensure that cross-arm wire fixture is connect more with cross-arm
It is firm.
In one of which embodiment, fixed seat and insulator are made of mould pressing process or pouring technology.
One molding or integrated pouring forming technology are simple and convenient, it is only necessary to provide and fixed seat and insulator structure shape
Adaptable mold, the manufacture craft of opposite porcelain and glass insulator, production process is simple, can improve production efficiency,
Reduce human cost and time cost.
In one of which embodiment, the vessel that connector and fixed seat cooperatively form, the inner surface and cross-arm of vessel
Outer surface match.
The vessel that connector and fixed seat cooperatively form avoids cross-arm structural stress from concentrating, is avoiding for housing cross-arm
Cross-arm wire fixture is fixedly secured on cross-arm while being punched on cross-arm.Generally, the cross section of cross-arm is circle
Shape is rectangular, and vessel can also be respectively set to round or rectangular to house cross-arm.
In one of which embodiment, at least one in connector and fixed seat is hooping structure, and anchor ear includes hoop
Body is used to house cross-arm with the hoop ear on hoop body both sides, hoop body is arranged.
At least one in connector and fixed seat is hooping structure, and hooping structure can house cross-arm, is not had in cross-arm
Upper punching can insulator be fixed on cross-arm, easy for installation, the hoop body part of anchor ear is for housing cross-arm, connector and solid
Together, installation process is simple and convenient for reservation obvolvent.
There is currently three kinds of situations：First, fixed seat and connector are all hooping structures, and a pair of of anchor ear relative engagement is common
Vessel is formed, cross-arm is housed；Second, fixed seat is hooping structure, and connector is connecting plate, is arranged on anchor ear and connecting plate mutual
The through-hole of cooperation, anchor ear and connecting plate complement each other to form vessel and cross-arm wire fixture are fixed on cross-arm；Third, Gu
Reservation is connecting plate, and connector is hooping structure, and fit system is consistent with the second situation.Fixed seat and connector it is this
Connection type is avoided punches on cross-arm, ensure that the mechanical property of cross-arm.
Mutually matched through-hole, fastener packet are provided in one of which embodiment, between fixed seat and connector
The nut for including bolt and coordinating with bolt.
It is bolted fixed seat and connector, is fastened by nut, to easily fix cross-arm wire fixture
On cross-arm.Fastener can also directly wale the both sides of fixed seat and connector by the way of metal Fang Huan, thus will
Insulator is fixed on cross-arm.
In one of which embodiment, insulator includes core and the full skirt that is arranged outside core, core and fixation
Seat is integrally formed, and can be increased creepage distance in core peripheral surface injection full skirt, be ensured the electrical of the cross-arm wire fixture
Insulation performance.
In addition, the second object of the present invention is to provide a kind of cross-arm, which includes above-mentioned cross-arm wire fixture, one
Aspect achievees the purpose that exempt from punching, is on the other hand molded efficient and convenient, and cross-arm is made of composite material, composite material cross arm
Exempt to punch fixed form with apparent advantage, advantageously ensures that the mechanical property of composite material cross arm.
Description of the drawings
Fig. 1 is the structural schematic diagram of the cross-arm wire fixture 10 of the embodiment of the present invention one；
Fig. 2 is that the cross-arm wire fixture 10 of the embodiment of the present invention one is fixed on the structural schematic diagram on cross-arm 18；
Fig. 3 is the 12 integrally formed structural schematic diagram of insulator 11 and fixed seat of the embodiment of the present invention one；
Fig. 4 is the connector of the embodiment of the present invention one and the structural schematic diagram of fixed seat；
Fig. 5 is the structural schematic diagram of the cross-arm wire fixture 20 of the embodiment of the present invention two；
Fig. 6 is the structural schematic diagram of the cross-arm wire fixture 30 of the embodiment of the present invention three；
Fig. 7 is the structural schematic diagram of the cross-arm wire fixture 40 of the embodiment of the present invention four；
Fig. 8 is the structural schematic diagram of the cross-arm wire fixture 50 of the embodiment of the present invention five；
Fig. 9 is the structural schematic diagram of the cross-arm wire fixture 60 of the embodiment of the present invention six.
Specific implementation mode
According to requiring, the specific implementation mode of the present invention will be disclosed here.It is to be understood, however, that described herein
Embodiment be only the present invention exemplary, can be presented as various forms.Therefore, what is disclosed here is specific thin
Section is not to be considered as limiting, and is merely possible to the basis of claim and as instructing those skilled in the art
By in practice it is any it is appropriate in a manner of differently apply the representative basis of the present invention, include using described herein various
Feature simultaneously combines the feature that may do not disclose clearly here.
Embodiment one：
It please refers to Fig.1 to Fig. 4, cross-arm wire fixture 10 is fixed on cross-arm 18, and cross-arm wire fixture 10 wraps
Insulator 11, fixed seat 12, connector 13 and fastener 14 are included, insulator 11 and fixed seat 12 are integrally formed, 12 He of fixed seat
Connector 13 complements each other to form vessel 17, and for housing cross-arm 18, fixed seat 122 and connector 13 are fastened on by fastener 14
On cross-arm 18, it need not be punched on cross-arm 18.
Such as Fig. 2, insulator 11 is fixed on cross-arm 18, vertical with cross-arm 18 in the horizontal plane, increase lead between away from
From reduction wind puts the short-circuit risks brought.On multiphase electric pole, if be directly anchored on lower phase cross-arm under the drawing of lead, draw
Line is too short with the conductor spacing for hanging over lower phase cross-arm, easily leads to short circuit, by fixed insulator vertical with cross-arm, opposite can increase
Add the distance between lead and lower phase conductor；Furthermore it is also possible to by increase insulator length come increase between the two away from
From.
Such as Fig. 3, fixed seat 12 is arranged in the end of insulator 11, and hanging wire end 113 of the insulator 11 far from fixed seat 12 is used
In anchor leg.In the present embodiment, connector 13 and fixed seat 12 use glass fibre and epoxy resin one compression molding, when
Can also so use other fibre reinforced materials of aramid fiber etc. and including polyethylene, polyvinyl chloride, polystyrene, gather
The matrixes synthetic resin such as propylene and ABS resin, on the one hand these materials are on the other hand whole after machine-shaping with insulating properties
The cross-arm wire fixture 10 of body has certain mechanical strength anchor leg.Fixed seat 12 is integrally formed with insulator 11,
Connector 13 can also be made of metal material, and metal material includes stainless steel and other alloy materials, is had centainly
The integrated molding of mechanical strength, certain fixed seat 12 and insulator 11 can also use metal material inserts to coordinate composite material one
The mode of body compression molding is made, and metal material is consistent with above description with composite material, repeats no more.
In the present embodiment, fixed seat 12 and insulator 11 are integrally formed using mould pressing process, it is of course also possible to use cast
Technique is integrally formed, and mould pressing process and pouring technology only need to make corresponding mold before technique, by molding device or
Above-mentioned material is provided in the mold of person's casting device, integrally formed fixed seat 12 and insulator 11 can be produced in batches, to
Production efficiency is improved, labour cost and time cost are reduced.
Connector 13 complements each other to form vessel 17, the inner surface of vessel 17 and the outer surface phase of cross-arm 18 with fixed seat 12
It coincide, to accommodating cross-arm 18, can concentrate, avoid to avoid the fixed seat 12 and 13 stress of connector being in contact with cross-arm 18
Insulator 11 is fastened on cross-arm by cross-arm 18 while punching.Vessel 17 can be rectangular vessel and round vessel, rectangular appearance
Chamber is for housing square cross arm, and round vessel is for accommodating round cross-arm.It is of course also possible to accommodate round cut with rectangular vessel 17
The cross-arm 18 in face or the cross-arm 18 that square-section is accommodated with round vessel 17, as long as ensureing that cross-arm 18 and insulator 11 are relatively solid
Fixed, the outer surface of the inner surface and cross-arm 18 of vessel 17 is misfitted, mainly consideration connector, fixed seat and cross-arm by
Power concentration problem, stress concentration easily cause fatigue of materials, influence the fixed effect of cross-arm wire fixture 10.
In the present embodiment, fixed seat 12 and connector 13 are two hooping structures, and such as Fig. 4, connector 13 includes hoop body
131 are provided with through-hole 133 with hoop ear 132, hoop ear 132, and the planform of fixed seat 12 is identical as connector 13, including hoop body
121 are provided with and 13 mutually matched through-hole 123 of connector with hoop ear 122, fixed seat 12.The hoop body 121 of fixed seat 12 and company
The hoop body 131 of fitting 13 complements each other to form vessel 17 (being not shown in Fig. 3), and fastener 14 passes through fixed seat 12 and connector 13
Through-hole 123,133, the two is fixed on cross-arm 18.
Fastener 14 includes bolt 15 and nut 16, and bolt 15 passes through the through-hole 133 being arranged at hoop ear 132, nut 16
Fixed seat 12 and connector 13 are fastened on cross-arm across through-hole 123,133.Fastener 50 can also be arranged to elastic component, will
The hoop ear 122,132 of fixed seat 12 and connector 13 is fixed on cross-arm, can be removed from this way in fixed seat 12 and connector 13
Upper punching facilitates installation.
Such as Fig. 3, insulator 11 includes core 111 and the full skirt 112 being arranged outside core 111, core 111 and fixed seat 12
Be integrally formed, full skirt 112 can with core 111, the integrated compression molding of fixed seat 12, it is convenient and efficient, naturally it is also possible to first to make core
Body 111 and fixed seat 12 are integrally formed, and then silicon rubber is injected on core 111, form full skirt 112, full skirt 112 is for increasing
Add creepage distance.
A kind of cross-arm is also disclosed in the present embodiment, and cross-arm is using drawing and extruding bar, cross-arm made of glass fibre and epoxy resin
Periphery is cased with silicone rubber jacket or silicon rubber umbrella skirt.Metal cross arm itself has strong mechanical performance, but metal material itself is without cease
Edge, compound cross-arm opposing metallic cross-arm increase insulation distance.After composite material cross arm punching, cross-arm can be seriously affected to load
Ability to bear, compound cross-arm exempt to punch fixed form and can ensure the mechanical property of compound cross-arm.
Embodiment two：
Such as Fig. 5, in the present embodiment, cross-arm wire fixture 20 includes insulator 21, fixed seat 22,23 and of connector
Fastener 24, fixed seat 22 and connector 23 cooperatively form vessel 25, house cross-arm, and fastener 24 is used for fixed seat 22 and connects
Fitting 23 is fastened on cross-arm.
Fixed seat 22 is hooping structure, the appearance of the inner surface and cross-arm (Fig. 5 is not shown) of the vessel 25 in fixed seat 22
Face is consistent, and to accommodating cross-arm, the hooping structure of fixed seat 22 is identical as embodiment one, and details are not described herein.
In the present embodiment, connector 23 is the connecting board structure using composite molding identical with embodiment one, when
Right connector 23 can also use stainless steel material, connector 23 be provided with 22 matched through-hole of fixed seat, pass through fastening
Connector 23 and fixed seat 22 are fastened on cross-arm (Fig. 5 is not shown) by part 24.Cross-arm wire fixture 20 need not be in cross
Punching ensure that the load endurance of cross-arm to which itself and cross-arm be fixed together in load.In addition, connector 23 is using connection
Harden structure eliminates mould pressing process identical with fixed seat and insulator, facilitates acquisition, has stronger mechanical performance.
Fixed seat 12 and the connection type of connector 22 and the structure of insulator 21 are identical as embodiment one, herein no longer
It repeats.
Embodiment three：
Such as Fig. 6, in the present embodiment, cross-arm wire fixture 30 includes insulator 31, fixed seat 32, connector 33 and tight
Firmware 34.Connector 33 is hooping structure, and fixed seat 32 is connecting plate, and connector 33 and fixed seat 32 are provided with mutually matched
Through-hole, fixed seat 32 and the integrated compression molding of insulator 31.
In the present embodiment, the moulding process of insulator 31 and fixed seat 32 is more convenient, need to only be arranged at 32 end of fixed seat
At plane tabular, fixed seat 32 be provided with 33 matched through-hole of connector, being fixed on cross-arm by fastener 34, (Fig. 6 is not
Show) on.
The structure of the insulator 31 and fixed form of cross-arm, anchor ear and 33 structure of connecting plate and function and embodiment two-phase
Together, details are not described herein.
Example IV：
Such as Fig. 7, in the present embodiment, cross-arm wire fixture 40 includes insulator 41, fixed seat 42, connector 43 and tight
Firmware 44, insulator 41 are integrally formed with fixed seat 42.
The structure of insulator 41 and fastener 44 is identical as embodiment one, and details are not described herein.Unlike, fixed seat 42
It is all made of round hooping structure with connector 43, round anchor ear includes hoop body and hoop ear, and hoop body is for accommodating round cross-arm.Certainly
Can be used for accommodating square cross arm, but round anchor ear accommodates square cross arm can lead to square cross arm stress concentration, influence cross-arm,
The mechanical performance of connector and fixed seat.It can certainly so that fixed seat is round hooping structure, connector is that connection is hardened
The round anchor ear part of structure, such fixed seat cooperates with fixed seat for housing cross-arm, connector and is fixed on insulator
On cross-arm；Equally, fixed seating portion can be connecting plate, and connector is round hooping structure.
In the present embodiment, fastener 44 uses metal Fang Huan, the inner surface of metal Fang Huan with by fixed seat 42 and connector
43 are fixed on cross-arm, to avoid being punched at hoop ear.In order to enable fixed seat 42 and 43 fixed effect of connector are more preferable,
It can be bound round at upper and lower two and multiple metal Fang Huan are provided at ear.
Embodiment five：
Such as Fig. 8, in the present embodiment, cross-arm wire fixture 50 includes insulator 51, fixed seat 52, connector 53 and tight
Firmware 54, insulator 51 are integrally formed with fixed seat 52.The setting of fixed seat 52 installs a cross-arm lead at 51 middle part of insulator
Fixing device 50 can be used to fixed both ends lead, simplifies structure, facilitates installation.If being arranged from the middle part of insulator 51 to both ends
Dry plate full skirt increases the creepage distance of insulator 51.
In the present embodiment, fixed seat 52 is located at the lower section of insulator 51, and fixed seat 52 and insulator 51 are integrally formed,
Fixed seat 52 and when complementing each other to form vessel 55 of connector 53, fixed seat 52 are placed on cross-arm, and connector is located at cross-arm
Below (Fig. 8 is not shown), insulator 51 is fixed on cross-arm by fastener 54.
Fixed seat 52 is identical as embodiment one as the connection type of connector 53, and details are not described herein.
Certainly, according to the constructive variation of fixed seat 52 and connector 53, entire cross-arm wire fixture 50 is fixed
Mode on cross-arm is also different, and fixed seat 52 and connector 53 all use the form of anchor ear or use an anchor ear one
The connection type of the form of a connecting plate, fixed seat 52 and connector 53 can be with the structure of reference implementation example one, two, three.
Embodiment six：
Such as Fig. 9, cross-arm wire fixture 60 includes insulator 61, fixed seat 62, connector 63 and fastener 64.It is fixed
Seat 62 is integrally formed with one of insulator 61, and connector 63 is integrally formed with another insulator 61, wherein connector
63 and fixed seat 62 structure it is consistent with previous embodiment.The other end of two insulators 61 is used equally for suspension lead.It is fixed
Seat 62 and connector 63 cooperatively form vessel 65, and mutually matched through-hole is provided between fixed seat 62 and connector 63, is passed through
64 connection fixing base 62 of fastener and connector 63, to which insulator 61 to be fixed on cross-arm.
Insulator 61, fixed seat 62 and cross-arm wire fixture 60 are fixed on fixed form and aforementioned reality on cross-arm
It is consistent to apply example.
The technology contents and technical characterstic of the present invention have revealed that as above, it being understood, however, that in the creative ideas of the present invention
Under, those skilled in the art can make various changes and improve to above structure and material, including individually discloses or want here
Ask the combination of the technical characteristic of protection, it will be apparent that other combinations including these features.These deformations and/or combination each fall within this
In the involved technical field of invention, and fall into the protection domain of the claims in the present invention.
Claims (10)
1. a kind of cross-arm wire fixture, is fixed on cross-arm, which is characterized in that including insulator, fixed seat, fastener and
Connector, the insulator and the fixed seat are integrally formed, and the fixed seat is cooperatively formed with the connector for housing
The vessel of the cross-arm, the fastener are used to the fixed seat and the connector being fastened on the cross-arm.
2. cross-arm wire fixture as described in claim 1, which is characterized in that the insulator in the horizontal plane with it is described
Cross-arm is vertically arranged.
3. cross-arm wire fixture as described in claim 1, which is characterized in that the fixed seat is arranged in the insulator
Middle part or end.
4. cross-arm wire fixture as described in claim 1, which is characterized in that the connector and the fixed seat use
Metal material or composite material are made.
5. cross-arm wire fixture as described in claim 1, which is characterized in that the fixed seat and the insulator use
Mould pressing process or casting process are made.
6. cross-arm wire fixture as described in claim 1, which is characterized in that the inner surface of the vessel and be accommodated in it
The outer surface of the interior cross-arm matches.
7. cross-arm wire fixture as described in claim 1, which is characterized in that in the connector and the fixed seat
At least one is hooping structure, and the anchor ear includes hoop body and hoop ear, and the hoop body is for housing the cross-arm.
8. cross-arm wire fixture as claimed in claim 7, which is characterized in that the fixed seat and connector setting
There is a mutually matched through-hole, the fastener includes bolt and the nut that coordinates with the bolt.
9. cross-arm wire fixture as described in claim 1, which is characterized in that the insulator includes that core and setting exist
Full skirt outside the core, the core are integrally formed with the fixed seat.
10. a kind of cross-arm, which is characterized in that including the cross-arm and cross-arm lead as claimed in any one of claims 1-9 wherein
Fixing device, the cross-arm are made of composite material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810201520.7A CN108331426A (en) | 2018-03-12 | 2018-03-12 | A kind of cross-arm wire fixture and cross-arm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810201520.7A CN108331426A (en) | 2018-03-12 | 2018-03-12 | A kind of cross-arm wire fixture and cross-arm |
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| CN108331426A true CN108331426A (en) | 2018-07-27 |
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| CN108988263A (en) * | 2018-09-04 | 2018-12-11 | 江西电力职业技术学院 | Transmission line of electricity drainage thread wind-proof device |
| CN114628092A (en) * | 2022-01-19 | 2022-06-14 | 衢州光明电力工程有限公司带电作业分公司 | Lightweight composite assembly type cross arm insulator and assembling method thereof |
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