CN101359815B - Scooter for tension stringing - Google Patents
Scooter for tension stringing Download PDFInfo
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- CN101359815B CN101359815B CN2008101671493A CN200810167149A CN101359815B CN 101359815 B CN101359815 B CN 101359815B CN 2008101671493 A CN2008101671493 A CN 2008101671493A CN 200810167149 A CN200810167149 A CN 200810167149A CN 101359815 B CN101359815 B CN 101359815B
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Abstract
The invention discloses a tension wire-laying tackle including a plurality of coaxial main sliding wheels, with flexible lining rings arranged on the surface of the guide channels to accommodate the protective requirement of leads; and one or two groups of auxiliary sliding wheels which are in parallel with the installation axes of the main sliding wheels, each auxiliary sliding wheel is on the same installation facade with each main sliding wheel, the surface of the guide channels of the auxiliary sliding wheels adopt hard materials applied to traction ropes; the auxiliary sliding wheels are arranged on a lifting supporting mechanism, and are controlled to rise and drop in relation to main sliding wheels through the lifting supporting mechanism, when the auxiliary sliding wheels are in the highest working position reached by the lifting supporting mechanism, the upper vertex at the bottom of the guide channel of the auxiliary sliding wheels is higher than that of the main sliding wheels, when the auxiliary sliding wheels are at the lowest working position reached by the lifting supporting mechanism, the upper vertex at the bottom of the guide channel of the auxiliary sliding wheels is lower than that of the main sliding wheels by a certain distance, a trigger mechanism that controls the lifting supporting mechanism to transit from rising state to dropping state is also included. The tension wire-laying tackle can apply to <Eight haul 8> tension wire-laying of ultra-voltage electric wires.
Description
Technical field
The present invention relates to the coaster that a kind of tension stringing is used, be suitable for " eight lead 8 " tension stringing of ultra high voltage electric wire.
Background technology
The sixties in 20th century, the U.S. and Russia, day, add, state such as meaning begins one's study 1000kV ultra-high voltage AC transmission technology, mouthfuls these 1988 begin to build the 1000kV circuit, total length reaches 430km.
What at present, 1000kV ultra high voltage engineering tension stringing construction method was commonly used is " one leads 8 (or 4+4) ", 2 * modes such as " one lead 4 ".
" one leads 8 (or 4+4) ": promptly tension field is provided with two covers, 4 stretching machines, and traction utilizes 1 hauling machine, whenever on the tower hangs one group of nine wheel line tackle mutually, and by a pull rope and eight line limps, eight root leads are put in exhibition simultaneously.
2 * " one leads 4 ": promptly utilize two cover " one leads 4 " stretching equipment, whenever on the tower hang two group of five wheel line tackle mutually, eight root leads are put in exhibition.
Yet, above-mentioned " one leads 8 (or 4+4) " technology is put eight leads with a hauling machine exhibition, particularly for the thicker ultra high voltage engineering of lead, need to adopt the large-tonnage pulling equipment, for a lot of units in charge of construction, need purchase new equipment and Work tool again, and large-tonnage rotary connector running difficulty, pull rope stressed excessive, security risk height.
And 2 * " one leads 4 " schemes can not effectively solve 8 bundle conductors and discharge, just extend construction technique difficult problems such as Synchronization Control synchronously.
" eight lead 8 " technology, then have the little characteristics of pulling equipment tonnage, the problems referred to above that need the large-tonnage pulling equipment to bring that " one leads 8 " exists have been overcome, but adopt present releasing pulley, " one leads 8 " and " one leads 4 " adopts nine to take turns or five wheel line tackles, employing be that pull rope is walked different special-purpose pulleys respectively with lead.And adopt " eight lead 8 " unwrapping wire mode, and lead of a pull rope traction, when pulley adopted the nylon wheel lining, the nylon lining had damage to the conductive line surfaces quality.And adopt to reduce the rubber-like compliant wheel lining of hardness, though effective guardwire surface quality, the pull rope that at first passes through can cause wearing and tearing to pulley sheave again, the lead that weares and teares of the pulley justice meeting after the wearing and tearing.
Summary of the invention
Purpose of the present invention just is to provide a kind of scooter for tension stringing, this coaster pull rope and the different requirements of lead at the time with lead of pull rope traction to pulley, adopt different pulleys respectively, solved the wear problem that tension force when wiring " eight lead 8 " payingoff construction mode that existing coaster is used for the ultra high voltage electric wire exists preferably lead.
The present invention adopts following technical scheme: a kind of scooter for tension stringing, comprise coaxial a plurality of head pulleys, and the installation shaft two ends of head pulley are fixed on two frames of hanger, and there is the compliant wheel lining on head pulley guide groove surface to adapt to the protection requirement of lead; It is characterized in that: also comprise one group or two groups of auxiliary pulleys, its installation shaft is parallel with the installation shaft of described head pulley, the pulley quantity of every group of auxiliary pulley equates or is less than head pulley with the quantity of head pulley, and each auxiliary pulley all is positioned on the same mounting vertical plane with a head pulley, and auxiliary pulley guide groove surface is for being suitable for the hard material of pull rope; Described auxiliary pulley is installed on the lifting supporting mechanism, rise and descend with respect to head pulley by lifting supporting mechanism control auxiliary pulley, it takes turns that the summit is higher than summit on the head pulley wheel bottom land on the bottom land when the high workload position that auxiliary pulley is in that the lifting supporting mechanism reaches, it is taken turns on the bottom land summit and is lower than summit certain distance on the head pulley wheel bottom land when auxiliary pulley is in the minimum service position of lifting supporting mechanism, also comprise a trigger mechanism control described lifting supporting mechanism from propradation to the decline state exchange.
Described lifting supporting mechanism can adopt prior aries such as cylinder or hydraulic cylinder, utilize the extension and contraction control auxiliary pulley of piston rod to rise grand, perhaps utilize motor by pulley and lift rope or adopt rack-and-pinion, worm and gear etc. to constitute the lifting supporting mechanisms, but for surging or pneumatic mode needs the work pumping plant power source is provided, and electronic mode also needs electricity consumption, and these modes all have baroque deficiency.As a further improvement on the present invention, adopt following technical scheme: described lifting supporting mechanism, the support that comprises the installation shaft two ends of the auxiliary pulley that is contained on the same group, the support other end is hinged on the frame of described hanger, also be hinged with a pull bar on the described support, the pull bar other end is hinged on the frame that is slidingly mounted on hanger, and slide block is installed in the position of the pin joint top that is positioned at support and hanger, and double link one end is hinged on that the other end is hinged on the frame of hanger on the slide block; In double link to a side away from the auxiliary pulley of correspondence, be provided with locating part and block double link to make double link can not serve as that axle is bent to that the summit is lower than summit on the head pulley wheel bottom land on the auxiliary pulley wheel bottom land with middle pin joint to this side, be higher than summit on the head pulley wheel bottom land on summit on the auxiliary pulley wheel bottom land under this stable state; Described trigger mechanism is can be with described double link to the moving mechanism of auxiliary pulley one thruster of correspondence.
Described trigger mechanism can adopt by transducers such as photoelectric sensor or travel switches and by the actuator of its control and constitute, the present invention can adopt following pure mechanical mechanism: on the frame of hanger cam is installed, cam is positioned at auxiliary pulley one side of double link away from correspondence, by axle an eccentric driving lever parallel with the head pulley installation shaft is installed corresponding to double link being positioned at the head pulley top position, push rod one end is hinged on the outside, eccentric axle center, the push rod other end is hinged with respect to the installation shaft off-centre of driving lever, when driving lever by when a side is rotated, the top rod driving cam rotation makes the described position of cam outer dead centre for double link is moving to corresponding auxiliary pulley one thruster, to middle pin joint to auxiliary pulley one side oscillation and surpass the link position of lower link point on the double link fall to it and take turns that the summit is lower than summit certain altitude on the head pulley wheel bottom land on the bottom land so that double link and pull bar and support are folded to auxiliary pulley.
This scooter for tension stringing of the present invention; constitute by head pulley and auxiliary pulley; head pulley adopts the compliant wheel lining not to be damaged on the guardwire surface; and the auxiliary pulley surface is for being suitable for the hard material of pull rope; pull rope is walked auxiliary pulley and head pulley is worn and torn avoiding when payingoff construction; the protection head pulley; thereby utilize trigger mechanism control lifting supporting mechanism that auxiliary pulley is descended to make lead to fall on the head pulley at lead through out-of-date, reach the effect of guardwire via the head pulley unwrapping wire.
Description of drawings
Fig. 1 is the structural representation of scooter for tension stringing of the present invention.
Fig. 2 is the right view of Fig. 1.
Fig. 3 is the state diagram of coaster of the present invention by pull rope the time.
Fig. 4 is the state diagram of coaster of the present invention by lead the time.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments, to help understanding content of the present invention.
As depicted in figs. 1 and 2, it is a kind of scooter for tension stringing of the present invention, comprise coaxial mounted a plurality of head pulley 6, the installation shaft two ends of head pulley 6 are fixed on two frames 11 of hanger 1, and there is the compliant wheel lining on head pulley 6 guide groove surfaces to adapt to the protection requirement of lead; Compliant wheel lining can rubber, plastics, SBS, polyurethane etc. lead by the time material of lead easy to wear not.Also comprise two groups of auxiliary pulleys 42, its installation shaft and the parallel installation of the installation shaft of head pulley 6, and two groups of auxiliary pulleys are that symmetry is installed in both sides, head pulley front and back.The pulley quantity of every group of auxiliary pulley equates to be similarly 5 with the quantity of head pulley, and each auxiliary pulley all is positioned on the same mounting vertical plane with a corresponding head pulley, makes the guide groove of the guide groove of head pulley and auxiliary pulley can be just in time relative like this.Auxiliary pulley guide groove surface is for being suitable for the hard material that pull rope passes through, for example nylon or engineering plastics, metal.Every group of auxiliary pulley 42 is installed on the folding connecting rod formula lifting supporting mechanism, rise and descend with respect to head pulley 6 by lifting supporting mechanism control auxiliary pulley 42, it is taken turns on the bottom land summit and is higher than head pulley 6 and takes turns summit on the bottom land when the high workload position that state auxiliary pulley 42 as shown in Figure 3 is in that the lifting supporting mechanism reaches, so that do not pass through head pulley during through auxiliary pulleys at pull rope 100.It is taken turns on the bottom land summit and is lower than head pulley 6 and takes turns summit certain distance on the bottom land when auxiliary pulley 42 is in the minimum service position of lifting supporting mechanism as shown in Figure 4, so that the lead 200 of this moment is through head pulley 6 unwrapping wire and by auxiliary pulley 42.Also comprise a trigger mechanism control described lifting supporting mechanism from propradation to the decline state exchange.As seen from Figure 3, because pull rope has a cornerite during by auxiliary pulley 42, adopt two groups of auxiliary pulley 42 symmetries to be installed in both sides, head pulley 6 front and back and only need make that the summit gets final product a little more than some top on the head pulley on the auxiliary pulley wheel bottom land, relatively low but also the stress equalization in installation site not only, the setting height(from bottom) of auxiliary pulley is higher when adopting one group of auxiliary pulley, and the possibility that exists switching centre of gravity instantly shakiness to rock.
Main beam in the hanger 12 adopts the structure of hollow to help reducing the weight of hanger as shown in Figure 1, and light being easy to of whole coaster constructed.
As shown in Figure 2, the lifting supporting mechanism comprises and is contained in the support 43 at the installation shaft two ends of auxiliary pulley 42 on the same group, support 43 other ends are hinged on hanger 1 and are positioned on the frame 11 of head pulley both sides, also be hinged with a pull bar 44 on the support 43, pull bar 44 other ends are hinged on the slide block 45 on the frame 11 that is slidingly mounted on hanger, and slide block 45 is installed in the position of the pin joint top that is positioned at support and hanger, double link 46 1 ends are hinged on the slide block 45, and the double link other end is hinged on the frame 11 of hanger.Being positioned at double link 46 1 sides away from the auxiliary pulley of correspondence on hanger 11 is provided with the locating part shelves and lives double link, making double link can only omit to this side as shown in Figure 2 serves as the axle bending with middle pin joint, hanger 11 adopts the outside channel-section steel of notch to make among the present invention, double link is the groove that is positioned at channel-section steel, therefore the bottom land inwall has promptly constituted stopping means and makes the double link can not be excessively to the opposite side bending, can only omit bending, bottom land withstands further bending of double link like this, making double link support slide block can not be at deadweight and auxiliary pulley deadweight component, the component effect of the active force of pull rope is to the whereabouts, remain on the extreme higher position operating state, double link 46 will need overcome the effect of above-mentioned power earlier and stretch earlier when auxiliary pulley 42 1 lateral bendings are bent simultaneously, therefore this structure can form a kind of stable and self-locking state, and the summit is higher than the state on the last summit of head pulley race bottom land on the maintenance auxiliary pulley race bottom land.Therefore as can be seen, at state shown in Fig. 2, only need make in the middle of the double link 46 jointed shafts protrude from slightly to the channel-section steel bottom direction that the line of centres of lower link point gets final product on the double link.For this lifting supporting mechanism, as long as trigger mechanism is for can be with double link to the moving mechanism of auxiliary pulley one thruster of correspondence, make its unstability after auxiliary pulley can fall automatically.
As shown in Figure 2, trigger mechanism is included in the cam of installing on the frame 11 of hanger 34, and cam 34 is positioned at auxiliary pulley one side of double link away from correspondence, i.e. two groups of two double link, 46 position intermediate that auxiliary pulley is used in the present embodiment.As depicted in figs. 1 and 2, by axle 31 an eccentric driving lever 32 parallel with the head pulley installation shaft is installed corresponding to double link 46 being positioned at the head pulley top position, push rod 33 1 ends are hinged on the outside, axle center of described cam 34, push rod 33 other ends are eccentric hinged with respect to the installation shaft 31 of driving lever, when driving lever 32 is rotated to the right, push rod 33 rotates to pressing down driving cam 34, two outer dead centre present positions on the cam 34 are to the moving position of corresponding auxiliary pulley 42 1 thrusters with double link 46, utilize cam outwards to push double link 46 also surpasses lower link point on the double link to auxiliary pulley one side oscillation to the middle pin joint of double link axial connecting line position, after losing the support of double link, slide block 45 falls along the side frame 11 of hanger, falls to it and takes turns that the summit is lower than summit certain altitude on the head pulley wheel bottom land on the bottom land so that double link 46 and pull bar 44 and support 43 are folded to auxiliary pulley 42.This trigger mechanism is pure mechanism structure, and is simple and compact for structure, and do not require the expenditure of energy.
For avoiding in the installation process owing to rock or shake lifting supporting mechanism unstability, as shown in Figure 2, also comprise a safety plug 8, all there is a through hole at same position place when connecting rod is in extended position on the frame of hanger and in the connecting rod of double link, safety plug 8 is inserted in the through hole on the frame of double link and hanger, with the frame relative fixed of double link and hanger, double link can not be swung with respect to the frame of hanger.
For reducing impact endurance test shock and the noise of auxiliary pulley when falling, on the frame 11 of hanger, be positioned at slide block 45 lower positions as depicted in figs. 1 and 2 and also be provided with damping, buffering spring 5, preferred air spring, buffering effect is better and can reach noiseless substantially effect.
The operating personnel stands during for ease of work high above the ground, is hinged with horizontal pedal 7 in the frame of the hanger outside 11, can upwards fold in time spent not and pack up.
In the embodiment of the invention, head pulley is 5, and intermediate pulley adopts and is suitable for the hard material that pull rope is used.Head pulley can adopt existing releasing pulley like this, by the releasing pulley that lifting supporting mechanism, auxiliary pulley, trigger mechanism are formed for " eight lead 8 " is installed, also can be when needed uses when common releasing pulley.Because the middle usually pulley of present releasing pulley is used to walk pull rope, if therefore head pulley adopts this pulley arrangements mode, the quantity of auxiliary pulley can be less than the quantity of head pulley, and the same facade position that promptly is exclusively used in away the pulley of pull rope in corresponding head pulley can not be provided with auxiliary pulley.
As shown in Figure 3, adopt " eight lead 8 " unwrapping wire mode pull rope 100 by auxiliary pulley 42 quilts direction of arrow index in the figure of forward position, and by head pulley 6, head pulley therefore can not wear and tear.When the limp 300 that connects pull rope 100 and lead 200 arrives releasing pulleys, its part that raises up can be stirred among Fig. 2 driving lever 32 forward and be swung forward, thereby it is folding to make the trigger mechanism action push away double link by cam, auxiliary pulley 42 falls, as shown in Figure 4 interior the continuation to front haulage of race that this moment, 200 in lead just in time dropped on head pulley 6.And because the cushioning effect of damping, buffering spring does not more steadily have impact when auxiliary pulley 42 is fallen.
Claims (10)
1. a scooter for tension stringing comprises coaxial a plurality of head pulleys, and the installation shaft two ends of head pulley are fixed on two frames of hanger, and there is the compliant wheel lining on head pulley guide groove surface to adapt to the protection requirement of lead; It is characterized in that: also comprise one group or two groups of auxiliary pulleys, its installation shaft is parallel with the installation shaft of described head pulley, the pulley quantity of every group of auxiliary pulley equates or is less than head pulley with the quantity of head pulley, and each auxiliary pulley all is positioned on the same mounting vertical plane with a head pulley, and auxiliary pulley guide groove surface is for being suitable for the hard material of pull rope; Described auxiliary pulley is installed on the lifting supporting mechanism, rise and descend with respect to head pulley by lifting supporting mechanism control auxiliary pulley, when the high workload position that auxiliary pulley is in that the lifting supporting mechanism reaches, the summit is higher than summit on the head pulley wheel bottom land on the wheel bottom land of auxiliary pulley; When auxiliary pulley was in the minimum service position of lifting supporting mechanism, the summit was lower than summit certain distance on the head pulley wheel bottom land on the wheel bottom land of auxiliary pulley; Also comprise a trigger mechanism control described lifting supporting mechanism from propradation to the decline state exchange.
2. scooter for tension stringing as claimed in claim 1 is characterized in that: described auxiliary pulley is two groups, and symmetry is installed in both sides, described head pulley front and back.
3. scooter for tension stringing as claimed in claim 1 or 2, it is characterized in that: described lifting supporting mechanism, comprise and be contained in the support at the installation shaft two ends of auxiliary pulley on the same group, the support other end is hinged on the frame of described hanger, also be hinged with a pull bar on the described support, the pull bar other end is hinged on the slide block on the frame that is slidingly mounted on hanger, and slide block is installed in the position of the pin joint top of the frame that is positioned at support and hanger, double link one end is hinged on the slide block, and the double link other end is hinged on the frame of hanger; On hanger, be positioned at double link one side away from the auxiliary pulley of correspondence, be provided with locating part and block double link, making double link can not serve as that axle is bent to that the summit is lower than summit on the head pulley wheel bottom land on the auxiliary pulley wheel bottom land with middle pin joint to this side, is higher than summit on the head pulley wheel bottom land on summit on the auxiliary pulley wheel bottom land under this stable state; Described trigger mechanism is can be with described double link to the moving mechanism of auxiliary pulley one thruster of correspondence.
4. scooter for tension stringing as claimed in claim 3, it is characterized in that: described trigger mechanism, be included in the cam of installing on the frame of hanger, cam is positioned at auxiliary pulley one side of double link away from correspondence, by axle an eccentric driving lever parallel with the head pulley installation shaft is installed corresponding to double link being positioned at the head pulley top position, push rod one end is hinged on the outside, axle center of described cam, the push rod other end is hinged with respect to the installation shaft off-centre of driving lever, when driving lever by when a side is rotated, the top rod driving cam rotation makes cam outer dead centre present position for double link is moving to corresponding auxiliary pulley one thruster, pin joint is to auxiliary pulley one side oscillation and surpass the axial connecting line position of lower link point on the double link to the double link, falls to it and takes turns that the summit is lower than summit certain altitude on the head pulley wheel bottom land on the bottom land so that double link and pull bar and support are folded to auxiliary pulley.
5. scooter for tension stringing as claimed in claim 4 is characterized in that: the middle pin joint of described cam installation site and described double link is in same horizontal level.
6. scooter for tension stringing as claimed in claim 3, it is characterized in that: also comprise a safety plug, all there is a through hole at same position place when connecting rod is in extended position on the frame of described hanger and in the connecting rod of described double link, described safety plug is inserted in the through hole on the frame of double link and hanger, makes the double link can not be with respect to the frame swing of hanger.
7. scooter for tension stringing as claimed in claim 3 is characterized in that: be positioned at described slide block lower position and also be provided with the damping, buffering spring on the frame of described hanger.
8. scooter for tension stringing as claimed in claim 1 or 2 is characterized in that: be hinged with horizontal pedal in the described hanger frame outside.
9. scooter for tension stringing as claimed in claim 1 or 2 is characterized in that: described head pulley is 5, and intermediate pulley adopts the hard material that is suitable for pull rope.
10. scooter for tension stringing as claimed in claim 1 or 2 is characterized in that: described compliant wheel lining is rubber, and described hard material is a nylon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101671493A CN101359815B (en) | 2008-10-07 | 2008-10-07 | Scooter for tension stringing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101671493A CN101359815B (en) | 2008-10-07 | 2008-10-07 | Scooter for tension stringing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101359815A CN101359815A (en) | 2009-02-04 |
| CN101359815B true CN101359815B (en) | 2011-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101671493A Active CN101359815B (en) | 2008-10-07 | 2008-10-07 | Scooter for tension stringing |
Country Status (1)
| Country | Link |
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| CN (1) | CN101359815B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025119B (en) * | 2009-09-22 | 2012-10-10 | 国家电网公司直流建设分公司 | Paying-off system and method |
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| CN101877460B (en) * | 2009-04-29 | 2013-04-10 | 国网交流工程建设有限公司 | Extreme high voltage combined paying off pulley |
| CN105703260A (en) * | 2014-11-25 | 2016-06-22 | 宜兴市博宇电力机械有限公司 | Novel multi-wheel combination pulley with pulley grooves internally embedded with metal wear-resistant bodies |
| BR112017015830B1 (en) * | 2015-02-09 | 2022-02-22 | Nv Bekaert Sa | Voltage dampening system for multi-wire compensation system |
| CN104934896B (en) * | 2015-06-05 | 2017-07-28 | 天津送变电工程公司 | The anti-wire job-hopping coaster of work transmission line and its construction technology |
| CN105262031B (en) * | 2015-08-27 | 2017-08-18 | 国网浙江省电力公司湖州供电公司 | Overhead transmission line suspension insulator slides hanging groove device |
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| CN110261095A (en) * | 2019-07-23 | 2019-09-20 | 广东电网有限责任公司 | A kind of tension stringing experimental rig |
| CN110504640B (en) * | 2019-09-03 | 2020-11-06 | 浙江鸣春纺织股份有限公司 | Electric power maintenance station type slide chair capable of maintaining balance and preventing unbalance weight by utilizing air pressure |
| CN110474275B (en) * | 2019-09-26 | 2020-06-02 | 国网四川省电力公司绵阳供电公司 | Transmission line cable damper and installation method thereof |
| CN111600238A (en) * | 2020-06-11 | 2020-08-28 | 云南电网有限责任公司昆明供电局 | Full-working-condition wiring robot for 500kV power transmission line |
| CN112672561B (en) * | 2020-12-22 | 2022-04-29 | 滁州安飞信电子科技有限公司 | Wall-mounted structure for communication equipment box |
| CN114123035B (en) * | 2021-11-29 | 2023-12-19 | 国网安徽省电力有限公司滁州市城郊供电公司 | Wire drag-and-drop pulley |
| CN115021146B (en) * | 2022-07-12 | 2024-03-22 | 中国电建集团重庆工程有限公司 | Crossing frame net sealing top rope pulley |
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| CN1262541A (en) * | 1999-02-03 | 2000-08-09 | 北京送变电公司 | 6-line stretching machine for setting up ultra-high-voltage transmission lines |
| CN201323408Y (en) * | 2008-10-07 | 2009-10-07 | 北京送变电公司 | Tackle for pay-off tension |
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2008
- 2008-10-07 CN CN2008101671493A patent/CN101359815B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1262541A (en) * | 1999-02-03 | 2000-08-09 | 北京送变电公司 | 6-line stretching machine for setting up ultra-high-voltage transmission lines |
| CN201323408Y (en) * | 2008-10-07 | 2009-10-07 | 北京送变电公司 | Tackle for pay-off tension |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025119B (en) * | 2009-09-22 | 2012-10-10 | 国家电网公司直流建设分公司 | Paying-off system and method |
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| CN101359815A (en) | 2009-02-04 |
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