CN104228610A - Bearing rope clamp, dropper and contact suspension - Google Patents
Bearing rope clamp, dropper and contact suspension Download PDFInfo
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- CN104228610A CN104228610A CN201410502124.XA CN201410502124A CN104228610A CN 104228610 A CN104228610 A CN 104228610A CN 201410502124 A CN201410502124 A CN 201410502124A CN 104228610 A CN104228610 A CN 104228610A
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- wire clamp
- bolt
- dropper
- wire
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Abstract
The invention provides a bearing rope clamp, a dropper and a contact suspension. The bearing rope clamp comprises a first clip, a second clip, a first bolt, a first nut and an electric contact member, wherein both the first clip and the second clip are provided with two extension parts which extend oppositely; the extension parts of the first clip face the extension parts of the second clip; the end parts of the two extension parts of the first clip are oppositely provided with first through holes respectively; the end parts of the two extension parts of the second clip are oppositely provided with second through holes respectively; the electric contact member is arranged between the head of the first bolt and the first nut; the first bolt penetrates the first through holes and the second through holes; the tail part of the first bolt is in screw joint with the first nut; the first nut clamps the first clip, the second clip and the electric contact member between the bolt head of the first bolt and the first nut. The bearing rope clamp, the dropper and the contact suspension provided by the invention can improve the safety of the contact suspension.
Description
Technical field
The present invention relates to mechanical technique, particularly relate to Horizontal messenger wire clamp, dropper and contact suspension.
Background technology
Railway traffic engineering contact net system, comprising the parts such as contact system, rail loop, flow wire and return wire, is to the direct link that electric EMU is powered in the urban transportation.Contact system is the power transmission network that a kind of track laying and railway tread keep certain distance.By the pantograph (or pantagraph current collector) of electric EMU and the moving contact of contact system, traction electric energy just enters electric EMU by contact system, drives traction motor to make train operation.Conventional contact system is made up of a few parts such as contact suspension, pillar and bases.
At present, the devices such as contact suspension is many by catenary, contact wire, dropper are formed, and its effect is to the power equipment supply of electric EMU by conduct electrical energy.Wherein, catenary hangs on the supportive device of pillar, contact wire is suspended on catenary by multiple dropper, contact wire, catenary and dropper become a through one, regulate the length of each dropper can make in whole span, contact wire to rail level keeps equal height, makes the elasticity of contact suspension relatively even in whole span, to the requirement of getting stream when meeting electric EMU high-speed cruising.
Be between dropper top and catenary and between dropper bottom and contact wire and be fixedly connected with, when the disturbance being subject to external environment condition, when especially having the adverse weather conditions such as typhoon, contact suspension produces larger fluctuation, contact system can be caused to fracture or produce larger electric arc incised wound.
Summary of the invention
The invention provides a kind of Horizontal messenger wire clamp, dropper and contact suspension, in order to solve contact suspension in prior art produce larger fluctuation when being subject to external environment condition disturbance thus cause contact system to fracture or produce larger electric arc incised wound problem.
One aspect of the present invention is to provide a kind of Horizontal messenger wire clamp, comprising: the first wire clamp, the second wire clamp, the first bolt and the first nut, electric contacting piece;
Described first wire clamp and described second wire clamp all have two relative extensions stretched out, and the extension of described first wire clamp is towards the extension of the second wire clamp;
The end of two extensions of described first wire clamp offers the first through hole respectively relatively;
The end of two extensions of described second wire clamp offers the second through hole respectively relatively;
Between the head that described electric contacting piece is arranged on described first bolt and the first nut;
Described first bolt is through described first through hole and the second through hole, described first bolt tail is bolted with described first nut, and described first wire clamp, described second wire clamp and described electric contacting piece are clamped between the bolt cap of described first bolt and described first nut by described first nut.
Horizontal messenger wire clamp as above, wherein,
Described electric contacting piece comprises the becket and the suspension ring that conduct electricity that are set on described first bolt;
Described becket is folded between described second wire clamp and the first nut, or described becket is folded between described first wire clamp and the head of the first bolt.
Horizontal messenger wire clamp as above, wherein,
Also comprise the spring washer be folded between described first bolt head and the first wire clamp end.
Another aspect of the present invention is to provide a kind of dropper, comprises dropper line, contact wire wire clamp and the Horizontal messenger wire clamp described in above-mentioned any one;
Described Horizontal messenger wire clamp bottom is connected with described dropper line top;
Described contact wire wire clamp top is connected with described dropper line bottom.
Dropper as above, wherein, the tip flexion of described dropper line becomes closed loop, and the first wire clamp of described Horizontal messenger wire clamp is through described closed loop.
Dropper as above, wherein, described contact wire wire clamp comprises: U-shaped folder, clamping plate, the second bolt and the second nut;
Described U-shaped fixture has two extensions relatively stretched out, and described clamping plate are folded between two extensions of described U-shaped folder;
Two extensions of described U-shaped folder offer third through-hole respectively relatively;
Described clamping plate offer the fourth hole matched with described second Bolt sizes, and the bottom of described clamping plate is formed for fixing the age of a draught animal of installing contact wire;
Described second bolt, through after described third through-hole and fourth hole, is fixed on described U-shaped folder bottom by described second nut.
Dropper as above, wherein, the bottom of described dropper line bends to closed loop, and the U-shaped of described contact wire wire clamp presss from both sides the closed loop through described dropper line bottom.
Another aspect of the present invention is to provide a kind of contact suspension, comprises catenary, contact wire and at least one dropper described in above-mentioned any one;
Described catenary passes from the second wire clamp of described Horizontal messenger wire clamp;
Described contact wire was fastened in the age of a draught animal of described contact wire wire clamp.
Contact suspension as above, wherein, forms gap between described second wire clamp and described catenary, forms gap between described U-shaped folder and described dropper line.
Horizontal messenger wire clamp provided by the invention, in dropper and contact suspension, Horizontal messenger wire clamp adopts the first wire clamp and the second wire clamp as main body, and be bolted on the extension of the first wire clamp and the second wire clamp by the first nut by first, the first wire clamp and the second wire clamp is made to surround certain space with the first bolt respectively, behind the space that dropper line surrounds through the first wire clamp and the first bolt can with Horizontal messenger wire clamp relative motion, behind the space that catenary surrounds through the second wire clamp and the first bolt also can with Horizontal messenger wire clamp relative motion, can ensure that contact suspension is when being subject to external environment condition disturbance and producing larger fluctuation, stable as early as possible and staticly to get off, improve the safety of contact suspension.
Accompanying drawing explanation
The structural representation of the Horizontal messenger wire clamp that Fig. 1 provides for the embodiment of the present invention one;
The structural representation of the dropper that Fig. 2 provides for the embodiment of the present invention two;
The structural representation of the contact wire wire clamp of the dropper that Fig. 3 provides for the embodiment of the present invention two;
The structural representation of the contact suspension that Fig. 4 provides for the embodiment of the present invention three.
Nomenclature:
1-first wire clamp 2-second wire clamp 3-first bolt
4-first nut 5-becket 6-conducts electricity suspension ring
7-spring washer 8-dropper line 9-U clevis
10-clamping plate 11-second bolt 12-second nut
13-age of a draught animal 14-catenary 15-contact wire
Detailed description of the invention
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
The structural representation of the Horizontal messenger wire clamp that Fig. 1 provides for the embodiment of the present invention one.The Horizontal messenger wire clamp that the present embodiment provides specifically may be used in the contact suspension of overhead type contact system.The effect of contact suspension is by conduct electrical energy to the power equipment supply of electric EMU, and by catenary, contact wire, the elements such as dropper, steady arm, compensating device, suspension hardware and mid point anchor are formed, and mainly comprise tramway type suspension equip ment and overhead contact line with catenary two kinds of modes.The suspension that contact wire is hanging to by dropper on catenary is called overhead contact line with catenary, in chain type hanging, catenary hangs on the supportive device of pillar, contact wire is suspended on catenary by dropper, contact wire is made not increase in pillar situation, increase hitch point, regulate dropper can make in whole span, contact wire to rail level keeps equal height, and be suspended on catenary due to contact wire, so essentially eliminate the hard spot of hanging position, make the elasticity of contact suspension relatively even in whole span, to the requirement of getting stream when being conducive to electric EMU high-speed cruising.
As shown in Figure 1, the Horizontal messenger wire clamp that the present embodiment provides, comprising: the first wire clamp 1, second wire clamp 2, first bolt 3 and the first nut 4 and electric contacting piece;
First wire clamp 1 and the second wire clamp 2 all have two relative extensions stretched out, and the extension of the first wire clamp 1 is towards the extension of the second wire clamp 2;
The end of two extensions of the first wire clamp 1 offers the first through hole respectively relatively;
The end of two extensions of the second wire clamp 2 offers the second through hole respectively relatively;
Electric contacting piece is arranged between the head of the first bolt 3 and the first nut 4;
First bolt 3 is through described first through hole and the second through hole, and the first bolt 3 afterbody is bolted with the first nut 4, and the first wire clamp 1, second wire clamp 2 and electric contacting piece are clamped between the bolt cap of the first bolt 3 and the first nut 4 by the first nut 4.
Particularly, the first wire clamp 1 and the second wire clamp 2 can be respectively used to be connected with dropper line and catenary.First wire clamp 1 all can be made up of two relative extensions stretched out with the open end of the second wire clamp 2, the extension of the first wire clamp 1 is towards the extension of the second wire clamp 2, namely the opening direction of the first wire clamp 1 and the second wire clamp 2 is oppositely arranged, as shown in Figure 1, first wire clamp 1 opening up, the second wire clamp 2 opening down.First wire clamp 1 and the second wire clamp 2 can bend to heart ring-type, are conveniently connected with catenary or dropper line.The end of two extensions of the first wire clamp 1 offers the first through hole respectively relatively, the end of two extensions of the second wire clamp 2 offers the second through hole respectively relatively, in the present embodiment, first bolt 3 is through after each first through hole and the second through hole, be bolted with the first nut 4, the first wire clamp 1 and the second wire clamp 2 are clamped.
In addition, also electric contacting piece is provided with in Horizontal messenger wire clamp, for realizing the electric current conduction between catenary and contact wire, electric contacting piece can be arranged between the head of the first bolt 3 and the first nut 4, and the first wire clamp 1, second wire clamp 2 is fixed together with electric contacting piece by the first bolt 3 and the first nut 4.
In actual applications, dropper entirety can comprise dropper line and Horizontal messenger wire clamp, and dropper line is as dropper body, and for connecting catenary and contact wire, Horizontal messenger wire clamp is used for the top of dropper line and catenary to link together.In Horizontal messenger wire clamp, first bolt 3 is through after the first through hole and the second through hole, first wire clamp 1, second wire clamp 2 and electric contacting piece are fixed together, wherein electric contacting piece can realize catenary and conducts to the electric current of contact wire, first wire clamp 1 can be connected with dropper line, and the second wire clamp 2 can be connected with catenary.To encircle a city between first bolt 3 and the first wire clamp 1 space can passed for dropper line, the bottom of dropper line can looped-shaped bending, through the first wire clamp 1, the cross-sectional plane in the space surrounded due to the first wire clamp 1 and the first bolt 3 is greater than the cross-sectional plane of dropper line, therefore, Horizontal messenger wire clamp and dropper line are no longer completely fixed, but to a certain extent can relative motion; In like manner, the space can passed for catenary is defined between first bolt 3 and the second wire clamp 2, the cross-sectional plane in the space surrounded due to the first wire clamp 1 and the first bolt 3 is greater than the cross-sectional plane of catenary, therefore, Horizontal messenger wire clamp and catenary are no longer completely fixed, but to a certain extent can relative motion.
The Horizontal messenger wire clamp that the present embodiment provides adopts the first wire clamp 1 and the second wire clamp 2 as main body, and by the first nut 4, first bolt 3 is fixed on the extension of the first wire clamp 1 and the second wire clamp 2, the first wire clamp 1 and the second wire clamp 2 is made to surround certain space with the first bolt 3 respectively, behind the space that dropper line surrounds through the first wire clamp 1 and the first bolt 3 can with Horizontal messenger wire clamp relative motion, behind the space that catenary surrounds through the second wire clamp 2 and the first bolt 3 also can with Horizontal messenger wire clamp relative motion, can ensure that contact suspension is when being subject to external environment condition disturbance and producing larger fluctuation, stable as early as possible and staticly to get off, improve the safety of contact suspension.
On the basis of the technical scheme provided at above-described embodiment, preferably, electric contacting piece comprises becket 5 and conduction suspension ring 6, becket 5 is set on the first bolt 3, one end of conduction suspension ring 6 is connected with becket 5, and the other end is connected with dropper line, to realize conducting function.
Wherein, becket 5 can be folded between the first wire clamp 1 and the head of the first bolt 3, or becket 5 can be folded between the second wire clamp 2 and the first nut 4, and shown in Fig. 1 is that becket 5 is folded between the second wire clamp 2 and the first nut 4.
On the basis of the technical scheme provided at above-described embodiment, preferably, Horizontal messenger wire clamp also comprises the spring washer 7 be folded between the first bolt 3 head and the first wire clamp 1 end, to prevent the first bolt 3 loose or dislocation.
Embodiment two
The structural representation of the dropper that Fig. 2 provides for the embodiment of the present invention two.As shown in Figure 2, the dropper that the present embodiment provides, comprises dropper line 8, contact wire wire clamp and the Horizontal messenger wire clamp described in above-mentioned any embodiment.Wherein, Horizontal messenger wire clamp bottom is connected with dropper line 8 top, and contact wire wire clamp top is connected with dropper line 8 bottom.Particularly, the top of dropper line 8 can bend to closed loop, and the first wire clamp 1 of Horizontal messenger wire clamp can pass this closed loop.
As can be seen from Figure 2, first wire clamp 1 and the first bolt 3 surround the space can passed for dropper line 8, and the top of dropper line 8 is through this space, and the cross-sectional plane due to this space is greater than the cross-sectional plane of dropper line 8 itself, therefore, dropper line 8 can with the first wire clamp 1 relative motion.
In addition, electrical connection can also be realized by conduction suspension ring 6 between Horizontal messenger wire clamp and dropper line 8, one end of conduction suspension ring 6 is connected with becket 5, becket 5 is set on the first bolt 3 of Horizontal messenger wire clamp, the other end of conduction suspension ring 6 is connected with dropper line 8, conduction suspension ring 6 are mainly used in conduction current, and the first wire clamp 1 of Horizontal messenger wire clamp is mainly used in the gravity bearing contact wire.
In the dropper that the present embodiment provides, the top that dropper line 8 presss from both sides is connected with the first wire clamp 1 of Horizontal messenger wire clamp, gap is formed between first wire clamp 1 and the first bolt 3, make dropper line 8 can with Horizontal messenger wire clamp relative motion, can ensure that contact suspension is when being subject to external environment condition disturbance and producing larger fluctuation, stable as early as possible and staticly to get off, improve the safety of contact suspension.
The structural representation of the contact wire wire clamp of the dropper that Fig. 3 provides for the embodiment of the present invention two.As shown in Figure 3, in the dropper that the present embodiment provides, contact wire wire clamp comprises: U-shaped folder 9, clamping plate 10, second bolt 11 and the second nut 12;
U-shaped folder 9 has two extensions relatively stretched out, and clamping plate 10 are folded between two extensions of U-shaped folder 9;
Two extensions of U-shaped folder 9 offer third through-hole respectively relatively;
Clamping plate 10 offer the fourth hole matched with the second bolt 11 size, and the bottom of clamping plate 10 is formed for fixing the age of a draught animal 13 of installing contact wire;
Second bolt 11, through after third through-hole and fourth hole, is fixed on bottom U-shaped folder 9 by the second nut 12.
From Fig. 3 to find out, in the contact wire wire clamp that the present embodiment provides, U-shaped folder 9 is from the side in falling " U " font, the top of U-shaped folder 9 is arc-shaped structure, the bottom of dropper line 8 can bend to closed loop, and U-shaped folder 9 through the closed loop of dropper line 8 bottom, can realize the connection with dropper line 8.U-shaped presss from both sides 9 bottoms and open end is made up of the extension that two are stretched out relatively, is fixed on the bottom of U-shaped folder 9 after the second bolt 11 presss from both sides two extensions of 9 through clamping plate 10 and U-shaped by the second nut 12.Clamping plate 10 bottom is inwardly recessed, and forms two corresponding ends, and two ends curved inwards form the ages of a draught animal 13, and contact wire can be folded in the age of a draught animal 13.
In the present embodiment, contact wire wire clamp adopts U-shaped folder 9 as main body, and by the second nut 12, second bolt 11 is fixed on the extension of U-shaped folder 9, U-shaped folder 9 and the second bolt 11 is made to surround certain space, dropper line 8 bottom looped-shaped bending is through this space, gap is formed between U-shaped folder 9 and dropper line 8, make dropper line 8 can with contact wire wire clamp relative motion, can ensure that contact suspension is when being subject to external environment condition disturbance and producing larger fluctuation, stable as early as possible and staticly to get off, improve the safety of contact suspension further.
On the basis of the technical scheme provided at above-described embodiment, preferably, two extensions of U-shaped folder 9 are parallel, and the width of clamping plate 10 is equal with the distance between two extensions, can two extensions be avoided when the second nut 12 is tightened to curve inwardly like this, effectively prevent U-shaped from pressing from both sides 9 distortion.
On the basis of the technical scheme provided at above-described embodiment, preferably, contact wire wire clamp also comprises the spring washer be folded between U-shaped folder 9 and the second bolt 11 head, to prevent the second bolt 11 loose or dislocation.
Embodiment three
The structural representation of the contact suspension that Fig. 4 provides for the embodiment of the present invention three.As shown in Figure 4, the contact suspension that the present embodiment provides, comprises catenary 14, contact wire 15 and at least one dropper described in above-mentioned any embodiment;
Wherein, catenary 14 passes from the second wire clamp 2 of Horizontal messenger wire clamp, in the age of a draught animal 13 that contact wire 15 is fastened on contact wire wire clamp.Form gap between second wire clamp 2 and catenary 14, between U-shaped folder 9 and dropper line 8, form gap.
Because catenary 14 needs the gravity bearing contact wire 15, so the material of catenary 14 wants soft, can bear comparatively hightension, during temperature traverse, sag change is little, and has certain conductive capability.The structure of catenary 14 is generally the strand wire of single core type.Contact wire 15 is generally made up of hard draw electrolytic copper, and hard draw electrolytic copper has the advantages such as good conductivity, intensity and hardness are high, withstanding corrosion, and applying more in the rail of city is Kufil contact wire.
In the contact suspension that the present embodiment provides, behind the space that catenary 14 surrounds through the second wire clamp 2 and first bolt 3 of Horizontal messenger wire clamp, can with Horizontal messenger wire clamp relative motion, the top of dropper line 8 and bottom to be each passed through after the U-shaped folder 9 of the first wire clamp 1 of Horizontal messenger wire clamp and contact wire wire clamp can with Horizontal messenger wire clamp and contact wire wire clamp relative motion, can ensure that contact suspension is when being subject to external environment condition disturbance and producing larger fluctuation, stable as early as possible and staticly to get off, improve the safety of contact suspension.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (9)
1. a Horizontal messenger wire clamp, is characterized in that, comprising: the first wire clamp, the second wire clamp, the first bolt and the first nut, electric contacting piece;
Described first wire clamp and described second wire clamp all have two relative extensions stretched out, and the extension of described first wire clamp is towards the extension of the second wire clamp;
The end of two extensions of described first wire clamp offers the first through hole respectively relatively;
The end of two extensions of described second wire clamp offers the second through hole respectively relatively;
Between the head that described electric contacting piece is arranged on described first bolt and the first nut;
Described first bolt is through described first through hole and the second through hole, described first bolt tail is bolted with described first nut, and described first wire clamp, described second wire clamp and described electric contacting piece are clamped between the bolt cap of described first bolt and described first nut by described first nut.
2. Horizontal messenger wire clamp according to claim 1, is characterized in that,
Described electric contacting piece comprises the becket and the suspension ring that conduct electricity that are set on described first bolt;
Described becket is folded between described second wire clamp and the first nut, or described becket is folded between described first wire clamp and the head of the first bolt.
3. Horizontal messenger wire clamp according to claim 1 and 2, is characterized in that, also comprises the spring washer be folded between described first bolt head and the first wire clamp end.
4. a dropper, is characterized in that, comprises dropper line, contact wire wire clamp and the Horizontal messenger wire clamp described in any one of claim 1-3;
Described Horizontal messenger wire clamp bottom is connected with described dropper line top;
Described contact wire wire clamp top is connected with described dropper line bottom.
5. dropper according to claim 4, is characterized in that, the tip flexion of described dropper line becomes closed loop, and the first wire clamp of described Horizontal messenger wire clamp is through described closed loop.
6. the dropper according to claim 4 or 5, is characterized in that, described contact wire wire clamp comprises: U-shaped folder, clamping plate, the second bolt and the second nut;
Described U-shaped fixture has two extensions relatively stretched out, and described clamping plate are folded between two extensions of described U-shaped folder;
Two extensions of described U-shaped folder offer third through-hole respectively relatively;
Described clamping plate offer the fourth hole matched with described second Bolt sizes, and the bottom of described clamping plate is formed for fixing the age of a draught animal of installing contact wire;
Described second bolt, through after described third through-hole and fourth hole, is fixed on described U-shaped folder bottom by described second nut.
7. dropper according to claim 6, is characterized in that,
The bottom of described dropper line bends to closed loop, and the U-shaped of described contact wire wire clamp presss from both sides the closed loop through described dropper line bottom.
8. a contact suspension, is characterized in that, comprises catenary, contact wire and the dropper described at least one claim 6 or 7;
Described catenary passes from the second wire clamp of described Horizontal messenger wire clamp;
Described contact wire was fastened in the age of a draught animal of described contact wire wire clamp.
9. contact suspension according to claim 8, is characterized in that, forms gap between described second wire clamp and described catenary, forms gap between described U-shaped folder and described dropper line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410502124.XA CN104228610A (en) | 2014-09-23 | 2014-09-23 | Bearing rope clamp, dropper and contact suspension |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410502124.XA CN104228610A (en) | 2014-09-23 | 2014-09-23 | Bearing rope clamp, dropper and contact suspension |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104228610A true CN104228610A (en) | 2014-12-24 |
Family
ID=52217829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410502124.XA Pending CN104228610A (en) | 2014-09-23 | 2014-09-23 | Bearing rope clamp, dropper and contact suspension |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104228610A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116512994A (en) * | 2023-07-03 | 2023-08-01 | 中铁建电气化局集团轨道交通器材有限公司 | Hanger device of electrified railway contact net system |
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| RU2416533C1 (en) * | 2010-02-04 | 2011-04-20 | Открытое Акционерное Общество "Российские Железные Дороги" | Device to secure, at least, one contact aerial to load bearing cable |
| CN201914118U (en) * | 2010-12-06 | 2011-08-03 | 宝鸡保德利电气设备有限责任公司 | Force-bearing cable dropper clamp for integral dropper |
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| CN2376462Y (en) * | 1999-05-19 | 2000-05-03 | 铁道部电气化工程局宝鸡器材厂 | Integral hanging implement for crane |
| JP3764981B2 (en) * | 2003-04-21 | 2006-04-12 | 東海旅客鉄道株式会社 | Hunger for curved sections of railway tracks |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116512994A (en) * | 2023-07-03 | 2023-08-01 | 中铁建电气化局集团轨道交通器材有限公司 | Hanger device of electrified railway contact net system |
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