CN102237655A - Method and tool for lifting overhead ground wire - Google Patents
Method and tool for lifting overhead ground wire Download PDFInfo
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- CN102237655A CN102237655A CN2011101865185A CN201110186518A CN102237655A CN 102237655 A CN102237655 A CN 102237655A CN 2011101865185 A CN2011101865185 A CN 2011101865185A CN 201110186518 A CN201110186518 A CN 201110186518A CN 102237655 A CN102237655 A CN 102237655A
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Abstract
The invention relates to the technical field of lifting operation of power transmission lines and discloses a method and a tool for lifting an overhead ground wire. The method comprises the following steps of: lifting the overhead ground wire by using the tool for lifting the overhead ground wire; and clamping a clamp 1 having a convex cavity structure on convex angular steel which is arranged symmetrically on an iron tower. The tool for lifting the overhead ground wire comprises the clamp 1, a lifting frame and a lifter, wherein the clamp 1 has the convex cavity structure which is clamped on a tower rod having a convex section; connecting holes are formed in two end edges of the convex cavity structure of the clamp 1 and connected with the lifter by fixing screws 14; and the lifter is a symmetric two-point lifting device which consists of lifting devices at two ends of a symmetric lifting frame. By the invention, high-altitude operation can be performed by a single person, a waist injury in the process of construction is avoided, and damage to a cross arm is avoided. The tool has the characteristics of simplicity, reasonability, wide installation application, convenience for installation, firmness, stability, safety, reliability, short distance between a lifting point and a lifting object, high working efficiency and the like.
Description
Technical field
The present invention relates to the technical field of power transmission sequence hoisting operation, relate in particular to carrying line method and carrying the Line tool of a kind of overhead ground wire of power transmission sequence.
Background technology
At present, the overhead ground wire hanging point place of power line tower adopts double-angle iron and plane downward mostly, also there is minority overhead ground wire hanging point to adopt double-angle iron and plane upwards, installation for the power line tower overhead ground wire, the workmen is in order to remove overhead ground wire from pulley block, after being installed, the ground wire suspension clamp utilize the connection gold utensil that ground wire is fixed on ground wire hanging point place, the method that adopts is that installation personnel carries out method pickaback, and this method pickaback exists following problem in real work:
(1) because workmen standing place on tower is not the optimum position that is fit to pickaback, strength can not be given full play in process pickaback, has certain difficulty with the correct position that makes ground wire can reach installation pickaback.
(2) pickaback during overhead ground wire because overhead ground wire weight is big, many work high above the ground personnel cause the lumbar strain phenomenon in operation process.
(3) pickaback overhead ground wire because the height shouldered of effect of ground line tension is high more, tension force is big more, needed strength is also just big more, a lot of big ground wire operations of span, and the operating personnel does not shoulder the position and from takeing on to come off the situation on ground, ground wire whereabouts takes place owing to ground wire takes place strength inadequately.
(4) this operational method needs two people's coordinating operations on the tower, because standing place and height is different, inharmonious, the inefficiency of cooperatively interacting, labour intensity is big, potential safety hazard is many.
Summary of the invention
For solving overhead ground wire the practical problem that exists is installed, the invention provides a kind of overhead ground wire carries line method and carries the Line tool, this proposes its simple and reasonable, esy to use, safe and reliable, suitable single operation on tower of the Line tool, can select to use according to the overhead ground wire stress and the individual operating habit of the pattern of different overhead ground wire hanging points, different spans.Have that labour intensity is low, the overhead ground wire line lifter of high efficiency.
For realizing aforesaid goal of the invention, the present invention adopts following technical scheme:
A kind of overhead ground wire is carried line method, is to adopt the Line tool of carrying of overhead ground wire to carry line, at first will be stuck in the jig of convex cavity configuration on the iron tower symmetry convex angle steel arranged side by side;
When adopting lifter is 2 lifting devices of symmetrical expression, the lifter suspension hook at the two ends of jig convex structure is hung on the two ends position ground wire in addition that suspension clamp is installed, with hand-operated tools two spanners are rotated simultaneously, and drive the coiling steel pipe and rotate and tighten up steel wire rope overhead ground wire is promoted, pause in the coiling steel pipe rotation process, the ratchet by the band spring ratchet that is automatically locked;
When adopting lifter is the single-point lifting device, the lifter suspension hook that jig convex structure connects hangs on the end position ground wire in addition that suspension clamp is installed, with hand-operated tools spanner is rotated, and drive the coiling steel pipe and rotate and tighten up steel wire rope overhead ground wire is promoted, pause in the coiling steel pipe rotation process, the ratchet by the band spring ratchet that is automatically locked.
A kind of overhead ground wire carry the Line tool, comprise: jig, crane boom, lifter, described jig is provided with the convex cavity configuration that is stuck on the tower bar that the cross section is a convex, and the limit, two ends of described jig convex structure is provided with connecting hole, connects and composes by fixed screw and lifter; Described lifter is that 2 lifting devices of symmetrical expression are made of the lifting device that symmetrical expression crane boom two ends are provided with; Described lifting device is made of hoisting frame, coiling steel pipe, steel wire rope, suspension hook, hoisting frame is a trench structure, the hoisting frame bottom land links to each other with jig by connecting screw, the hoisting frame trough rim is provided with coiling steel pipe and fixing screw mandrel, described coiling steel pipe is provided with the coiling hanging hole of steel wire rope, and steel wire rope is linked to each other with fixing screw mandrel by suspension hook by the coiling steel pipe; Described coiling steel pipe one end is provided with ratchet, the ratchet engagement that is provided with on ratchet and the hoisting frame; The described coiling steel pipe other end is provided with the spanner that cooperates with ratchet spanner.
A kind of overhead ground wire carry the Line tool, described jig constitutes the convex cavity configuration by convex clamp and connecting screw, protruding section of described convex cavity configuration is provided with jackscrew.
A kind of overhead ground wire carry the Line tool, the jig connecting hole that lifting device connecting hole that described symmetrical expression crane boom is provided with by channel-section steel and two ends and channel-section steel middle part are provided with constitutes.
A kind of overhead ground wire carry the Line tool, described coiling steel pipe one end is provided with ratchet, the ratchet engagement on ratchet and the hoisting frame; The described coiling steel pipe other end is provided with shaking the head of cooperating with rocking bar.
A kind of overhead ground wire carry the Line tool, described lifter is the single-point lifting device, the single-point lifting device is made of hoisting frame, coiling steel pipe, steel wire rope, suspension hook, and described hoisting frame is made of two parallel machine frame plates and coiling steel pipe, and hoisting frame links to each other with jig by connecting screw.
A kind of overhead ground wire carry the Line tool, described coiling steel pipe one end setting and the supporting large size spanner of ratchet spanner, the small size spanner that other end setting and rocking bar are supporting.
Because adopt aforesaid technical scheme, the present invention has following superiority:
A kind of overhead ground wire is carried line method and is carried the Line tool, in the time of can making the workmen carry out work high above the ground, do not need to use pickaback, single independence just can be finished, avoided the waist injury in the work progress, the standing part of this instrument and cross-arm, make full use of the original structure of double hanging point angle steel, when stressed, avoid damage to cross-arm, easy for installation, firm stable, also because of having shortened suspension centre to the distance of lifting by crane thing, can easily ground wire be risen to suitable installation site, the jig that this two point lifter adopts can according to the in-plane of lead cross-arm hanging point angle bar install adapt to wide, this lifter adopts two ends to be fixed with two lifting devices, make things convenient for the lifting and the fixed installation of ground wire, the lifting partial design of this lifter adopts ratchet to be automatically locked, and that suspension clamp is connected gold utensil is convenient and swift when hanging point is installed removing the ground wire coaster.This instrument has characteristics such as advantages of simple, safe and reliable, operating efficiency height, and can select to use according to the overhead ground wire stress and the individual operating habit of the pattern of different overhead ground wire hanging points, different spans.
Description of drawings
Fig. 1 is 2 lifting instruments of ratchet-type symmetry structural representation that makes progress on cross-arm angle bar plane;
Fig. 2 is that 2 lifting instruments of ratchet-type symmetry are at the downward structural representation in cross-arm angle bar plane; Fig. 3 is the structural representation that overhead ground wire ratchet-type single-point promotes instrument;
Fig. 4 is the structural representation that rocker-type symmetry two point promotes instrument for overhead ground wire;
Fig. 5 is the structural representation that overhead ground wire rocker-type single-point promotes instrument;
Among the figure: jig 1, jackscrew 2, connecting screw 3, hoisting frame 4, coiling steel pipe 5, coiling hanging hole 6, ratchet 7, ratchet 8, spanner 9, fixedly screw mandrel 10, steel wire rope 11, suspension hook 12, ratchet spanner 13, fixed screw 14, channel-section steel 15, ratchet rocking bar 16, shake the head 17.
Embodiment
Shown in Fig. 1,2,3,4,5,6, a kind of overhead ground wire carry line method, be to adopt the Line tool of carrying of overhead ground wire to carry line, at first will be stuck on the iron tower convex angle steel symmetrical arranged side by side with the jig 1 of convex cavity configuration;
When adopting lifter is 2 lifting devices of symmetrical expression, the lifter suspension hook at the two ends of jig 1 convex structure is hung on the two ends position ground wire in addition that suspension clamp is installed, with hand-operated tools two spanners 9 are rotated simultaneously, and drive coiling steel pipe 5 and rotate and tighten up steel wire rope overhead ground wire is promoted, pause in coiling steel pipe 5 rotation processes, the ratchet by the band spring ratchet that is automatically locked;
When adopting lifter is the single-point lifting device, the lifter suspension hook that jig 1 convex structure connects hangs on the end position ground wire in addition that suspension clamp is installed, with hand-operated tools spanner 9 is rotated, and drive coiling steel pipe 5 and rotate and tighten up steel wire rope overhead ground wire is promoted, pause in coiling steel pipe 5 rotation processes, the ratchet by the band spring ratchet that is automatically locked.
A kind of overhead ground wire carry the Line tool, comprise: jig 1, crane boom, lifter, described jig 1 is provided with the convex cavity configuration that is stuck on the iron tower that the cross section is a convex, and the limit, two ends of described jig 1 convex structure is provided with connecting hole, connects and composes by fixed screw 14 and lifter; Described lifter is that 2 lifting devices of symmetrical expression are made of the lifting device that symmetrical expression crane boom two ends are provided with; Described lifting device is made of hoisting frame 4, coiling steel pipe 5, steel wire rope 11, suspension hook 12, hoisting frame 4 is a trench structure, hoisting frame 4 bottom lands link to each other with jig 1 by connecting screw 3, hoisting frame 4 trough rims are provided with coiling steel pipe 5 and fixing screw mandrel 10, described coiling steel pipe 5 is provided with the coiling hanging hole 6 of steel wire rope 11, and steel wire rope 11 is linked to each other with fixing screw mandrel 10 by suspension hook 12 by coiling steel pipe 5; Described coiling steel pipe 5 one ends are provided with ratchet 7, ratchet 8 engagements that are provided with on ratchet 7 and the hoisting frame 4; Described coiling steel pipe 5 other ends are provided with the spanner 9 that cooperates with ratchet spanner 13.
Described jig 1 constitutes the convex cavity configuration by convex clamp and connecting screw 3, and protruding section of described convex cavity configuration is provided with jackscrew 2.
Described coiling steel pipe 5 one ends are provided with ratchet 7, ratchet 8 engagements on ratchet 7 and the housing 4; Described coiling steel pipe 5 other ends be provided with cooperate with ratchet rocking bar 16 shake the head 17.
Described lifter is the single-point lifting device, and the single-point lifting device is made of hoisting frame 4, coiling steel pipe 5, steel wire rope 11, suspension hook 12, and described hoisting frame 4 is made of two parallel machine frame plates and coiling steel pipe 5, and hoisting frame 4 links to each other with jig 1 by connecting screw 3.
Execution mode one
As shown in Figure 1, 2, the Line tool of carrying of a kind of overhead ground wire is 2 lifting instruments of ratchet-type symmetry, comprise: jig 1, crane boom, lifter, the convex cavity configuration of described jig 1 is stuck on the double angle hanging point that the cross section is a convex, the limit, two ends of described jig 1 convex structure is provided with connecting hole, connects and composes by fixed screw 14 and 2 lifting devices of symmetrical expression; Its symmetrical expression crane boom is made of channel-section steel 15 and the lifting device connecting hole of two ends setting and jig 1 connecting hole of channel-section steel 15 middle parts setting.Described jig 1 is installed on the iron tower hanging point angle steel, fixing with jackscrew 2, for the ease of dismounting, the hoisting frame 4 of described lifting device links to each other with the lifting device connecting hole that channel-section steel 15 two ends are provided with respectively by connecting screw 3, hoisting frame 4 is provided with coiling steel pipe 5, coiling steel pipe one end is provided with ratchet 7, ratchet top hoisting frame 4 is provided with ratchet 8 and cooperates realization automatic blocking with ratchet 7, prevent that tubulose bobbin winoler 5 from reversing, tubulose bobbin winoler 5 is provided with hanging wire hole 6 and links to each other with steel wire rope 11, the spanner 9 that 5 other end settings of tubulose bobbin winoler and ratchet spanner 13 are supporting, coiling steel pipe 5 links to each other with suspension hook 12 by steel wire rope 11 with set bolt 10.
During use, jig 1 is fixed on the cross-arm, fixing with jackscrew 2; Put down the suspension hook 12 at two ends, suspension hook 12 is colluded respectively on the overhead ground wire at two ends, then ratchet spanner 13 is installed in respectively on the spanner 9, clockwise rotate two ends spanner 9 with ratchet spanner 13 simultaneously, coiling steel pipe 5 is rotated tighten up steel wire rope 11 lifting overhead ground wires, make overhead ground wire break away from the pulley block position; Stop to promote when ground wire rises to the correct position that can install, the ratchet 7 that will be automatically locked of the ratchet 8 on the hoisting frame 4 prevents its reverse, and at this moment the operating personnel just can remove pulley block and carry out the installation of ground wire suspension clamp.
It should be noted that in operating process, all can cause the variation of stress and lifting strength because of the variation of the size of span and hoisting depth, ratchet spanner 13 is designed to extension type,, improves hoisting velocity and increase lifting strength so that the base area uniaxial stress is adjusted the length of ratchet spanner 13 handles.Use ratchet spanner promptly can adopt 360 ° of rotations, also can determine rotation amplitude as required and needn't remove sleeve and be inserted in again, shake pause in the process ratchet 7 that can be automatically locked by the ratchet 8 of band spring.
As shown in Figure 4: 2 lifting instruments of ratchet-type symmetry also can be made into 2 lifting instruments of rocker-type symmetry, spanner 9 changed into shake the head 17, use rocking bar 16 to insert two ends and shake the head 17, rotating shaking the head of two ends simultaneously 17 carries out ground wire and promotes, in rotation process, can according to circumstances select 360 ° of rotations, also can select the rotation of required angle, the ratchet 7 on the coiling steel pipe 5 that to be automatically locked by the ratchet 8 of band spring of the pause in the process of shaking.
Execution mode two
As shown in Figure 3, the Line tool of carrying of a kind of overhead ground wire is that overhead ground wire ratchet-type single-point promotes instrument, comprise top jig 1, bottom lifting part two parts constitute, top jig 1 is installed on the hanging point angle steel 14, fixing with jackscrew 2, for the ease of dismounting, this hoisting frame 4 links to each other with jig 1 by connecting screw 3, hoisting frame 4 is provided with coiling steel pipe 5, coiling steel pipe one end is provided with ratchet 7, ratchet top hoisting frame 4 is provided with ratchet 8 and ratchet 7 cooperates realization automatic blocking, prevents that tubulose bobbin winoler 5 from reversing; Tubulose bobbin winoler 5 is provided with hanging wire hole 6 and links to each other with steel wire rope 11, coiling steel pipe 5 one ends are provided with the large size spanner 9 supporting with ratchet spanner 13, the other end be provided with the supporting small size spanner 9 of ratchet spanner 13, coiling steel pipe 5 links to each other with suspension hook 12 by steel wire rope 11 with fixing screw mandrel 10.
During use, jig 1 is fixed on the cross-arm 14, fixing with jackscrew 2, hoisting frame 4 usefulness connecting screws are linked to each other with jig 1, put down suspension hook 12, suspension hook 12 is colluded on the overhead ground wire, then ratchet spanner 13 is set on the spanner 9, clockwise rotate spanner 9 with ratchet spanner 13, coiling steel pipe 5 is rotated tighten up steel wire rope 11 lifting overhead ground wires, make overhead ground wire break away from the pulley block position, when ground wire rises to the correct position that can install, stop to promote, ratchet 8 on the crane boom ratchet 7 that will be automatically locked prevents its reverse, and at this moment the operating personnel just can remove pulley block and carries out the ground wire suspension clamp and install.
In order to adapt to the ground wire lifting of various span stress, spanner 9 is designed to two kinds of models, be separately positioned on the two ends of tubulose bobbin winoler 5, solution all can cause the variation issue of stress and lifting strength because of the variation of the size of span and hoisting depth, and is little for stress, and lightweight ground wire is with the spanner 9 of ting model, can improve hoisting velocity, the ground wire that counter stress is big uses big model spanner 9 to increase and promotes strength
Ratchet spanner 13 is designed to extension type,, improves hoisting velocity and increase lifting strength so that the base area uniaxial stress is adjusted the length of ratchet spanner 13; Use ratchet spanner both can adopt 360 ° of rotations, also can determine rotation amplitude as required and needn't remove sleeve and be inserted in again, shake pause in the process ratchet 7 that can be automatically locked by the ratchet 8 of band spring.
As shown in Figure 5, overhead ground wire ratchet-type single-point promotes instrument and also can be made into rocker-type single-point lifting instrument, spanner 9 changed into shake the head 17, use two rocking bars 16 to insert two ends and shake the head 17, rotating shaking the head of two ends simultaneously 17 carries out ground wire and promotes, in rotation process, can according to circumstances select 360 ° of rotations, also can select the rotation of required angle, the ratchet 7 on the coiling steel pipe 5 that to be automatically locked by the ratchet 8 of band spring of the pause in the process of shaking.
Claims (7)
- An overhead ground wire carry line method, it is characterized in that: be to adopt the Line tool of carrying of overhead ground wire to carry line, the jig (1) of band convex cavity configuration is stuck on the iron tower symmetry convex angle steel arranged side by side;When adopting lifter is 2 lifting devices of symmetrical expression, the lifter suspension hook at the two ends of jig (1) convex structure is hung on the two ends position ground wire in addition that suspension clamp is installed, with hand-operated tools two spanners (9) are rotated simultaneously, and drive coiling steel pipe (5) and rotate and tighten up steel wire rope overhead ground wire is promoted, pause in coiling steel pipe (5) rotation process, the ratchet by the band spring ratchet that is automatically locked;When adopting lifter is the single-point lifting device, the lifter suspension hook that jig (1) convex structure connects hangs on the end position ground wire in addition that suspension clamp is installed, with hand-operated tools spanner (9) is rotated, and drive coiling steel pipe (5) and rotate and tighten up steel wire rope overhead ground wire is promoted, pause in coiling steel pipe (5) rotation process, the ratchet by the band spring ratchet that is automatically locked.
- According to claim 1 a kind of overhead ground wire of method carry the Line tool, it is characterized in that: comprising: jig (1), crane boom, lifter, described jig (1) is provided with the convex cavity configuration that is stuck on the tower bar that the cross section is a convex, the limit, two ends of described jig (1) convex structure is provided with connecting hole, connects and composes by fixed screw (14) and lifter; Described lifter is that 2 lifting devices of symmetrical expression are made of the lifting device that symmetrical expression crane boom two ends are provided with; Described lifting device is made of hoisting frame (4), coiling steel pipe (5), steel wire rope (11), suspension hook (12), hoisting frame (4) is a trench structure, hoisting frame (4) bottom land links to each other with jig (1) by connecting screw (3), hoisting frame (4) trough rim is provided with coiling steel pipe (5) and fixing screw mandrel (10), described coiling steel pipe (5) is provided with the coiling hanging hole (6) of steel wire rope (11), and steel wire rope (11) is linked to each other with fixing screw mandrel (10) by suspension hook (12) by coiling steel pipe (5); Described coiling steel pipe (5) one ends are provided with ratchet (7), and ratchet (7) is gone up ratchet (8) engagement that is provided with hoisting frame (4); Described coiling steel pipe (5) other end is provided with the spanner (9) that cooperates with ratchet spanner (13).
- A kind of overhead ground wire as claimed in claim 2 carry the Line tool, it is characterized in that: described jig (1) constitutes the convex cavity configuration by convex clamp and connecting screw (3), and protruding section of described convex cavity configuration is provided with jackscrew (2).
- A kind of overhead ground wire as claimed in claim 2 carry the Line tool, it is characterized in that: jig (1) connecting hole that lifting device connecting hole that described symmetrical expression crane boom is provided with by channel-section steel (15) and two ends and channel-section steel (15) middle part are provided with constitutes.
- A kind of overhead ground wire as claimed in claim 2 carry the Line tool, it is characterized in that: described coiling steel pipe (5) one ends are provided with ratchet (7), ratchet (8) engagement on ratchet (7) and the hoisting frame (4); Described coiling steel pipe (5) other end is provided with shake the head (17) that cooperate with rocking bar (16).
- 6. a kind of overhead ground wire as claimed in claim 2 carries the Line tool, it is characterized in that: described lifter is the single-point lifting device, the single-point lifting device is made of hoisting frame (4), coiling steel pipe (5), steel wire rope (11), suspension hook (12), described hoisting frame (4) is made of two parallel machine frame plates and coiling steel pipe (5), and hoisting frame (4) links to each other with jig (1) by connecting screw (3).
- A kind of overhead ground wire as claimed in claim 2 carry the Line tool, it is characterized in that: described coiling steel pipe (5) one end settings and the supporting large size spanner (9) of ratchet spanner (13), the small size spanner (9) that other end setting and rocking bar are supporting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101865185A CN102237655A (en) | 2011-07-05 | 2011-07-05 | Method and tool for lifting overhead ground wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101865185A CN102237655A (en) | 2011-07-05 | 2011-07-05 | Method and tool for lifting overhead ground wire |
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| Publication Number | Publication Date |
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| CN102237655A true CN102237655A (en) | 2011-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101865185A Pending CN102237655A (en) | 2011-07-05 | 2011-07-05 | Method and tool for lifting overhead ground wire |
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| CN102611036A (en) * | 2012-03-15 | 2012-07-25 | 福建省电力有限公司三明电业局 | Spacing-adjustable cross arm fixator |
| CN102916372A (en) * | 2012-11-13 | 2013-02-06 | 江苏省电力公司无锡供电公司 | Wire lifting tool for intermediate phase conductor of 10kV same-pole multi-circuit line |
| CN103795003A (en) * | 2014-02-27 | 2014-05-14 | 江苏省电力公司常州供电公司 | Insulating wire lifting device for hot-line work of 35kV power supply line |
| CN104201615A (en) * | 2014-09-24 | 2014-12-10 | 广西电网公司桂林供电局 | High-voltage transmission line linear tower electrified operation overhead ground wire lifting device |
| CN107425475A (en) * | 2017-09-13 | 2017-12-01 | 国网辽宁省电力有限公司鞍山供电公司 | A kind of overhead earth wire lifter and its lifting installation method |
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| CN102611036A (en) * | 2012-03-15 | 2012-07-25 | 福建省电力有限公司三明电业局 | Spacing-adjustable cross arm fixator |
| CN102916372A (en) * | 2012-11-13 | 2013-02-06 | 江苏省电力公司无锡供电公司 | Wire lifting tool for intermediate phase conductor of 10kV same-pole multi-circuit line |
| CN102916372B (en) * | 2012-11-13 | 2016-06-01 | 江苏省电力公司无锡供电公司 | 10kV multi-circuit lines on the same pole mesophase spherule wire lifting instrument |
| CN103795003A (en) * | 2014-02-27 | 2014-05-14 | 江苏省电力公司常州供电公司 | Insulating wire lifting device for hot-line work of 35kV power supply line |
| CN103795003B (en) * | 2014-02-27 | 2016-04-13 | 江苏省电力公司常州供电公司 | Line apparatus is carried in the insulation of 35kV supply line live line working |
| CN105811301A (en) * | 2014-02-27 | 2016-07-27 | 江苏省电力公司常州供电公司 | Low-cost insulating line lifting device for live working of 35kV power supply line |
| CN105811301B (en) * | 2014-02-27 | 2017-10-17 | 国网江苏省电力公司常州供电公司 | The insulation of the 35kV supply lines livewire work of low cost carries line apparatus |
| CN104201615A (en) * | 2014-09-24 | 2014-12-10 | 广西电网公司桂林供电局 | High-voltage transmission line linear tower electrified operation overhead ground wire lifting device |
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Application publication date: 20111109 |