CN104167687A - Tool for live-line replacement of suspension insulator and using working method thereof - Google Patents
Tool for live-line replacement of suspension insulator and using working method thereof Download PDFInfo
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- CN104167687A CN104167687A CN201410343363.5A CN201410343363A CN104167687A CN 104167687 A CN104167687 A CN 104167687A CN 201410343363 A CN201410343363 A CN 201410343363A CN 104167687 A CN104167687 A CN 104167687A
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- insulator
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- instrument
- suspension insulator
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Abstract
The invention discloses a tool for live-line replacement of a suspension insulator and a using working method thereof. The tool comprises a frame type bracket and a telescopic suspension mechanism arranged at the top of the frame type bracket. The telescopic suspension mechanism includes an adjusting lead screw and a self-locking hook arranged at the top of the adjusting lead screw. The frame type bracket includes a supporting plate at the bottom and a cross-brace unit at the top; the middle portion of the cross-brace unit is connected with the bottom of the adjusting lead screw; and the supporting plate and the cross-brace unit are connected by two insulating connecting elements with adjustable lengths. According to the invention, the frame type bracket with the telescopic suspension mechanism at the top is used for ground potential live-line suspension insulator replacement of the power transmission line; and the transmission line or weight is supported by the supporting plate, so that the tensile forces of the transmission line and the weight are transferred to the tool from the suspension insulator. Therefore, the cross arm worker can complete the replacement process of the suspension insulator by himself, thereby bringing the great convenience for suspension insulator replacement. Moreover, the tool has advantages of simple structure, high security, stability, and reliability, and high efficiency.
Description
Technical field
The present invention relates to electric transmission line isolator and change technical field, particularly a kind of instrument of charged for replacement suspension insulator and use operational method thereof.
Background technology
During current power transmission circuit earth potential live replacing suspension insulator, traditional work method is that on cross-arm, first operating personnel is fixedly installed assembly pulley on cross-arm, hook hook are set in the abseiling of assembly pulley to be placed on power transmission line, by ground staff, coordinate stay cord, power transmission line and suspension insulator are promoted, make insulator not be subject to the pulling force effect of power transmission line, then by operating personnel on shaft tower with insulating bar pull pin, insulator displacement, latch, thereby realize the replacing of suspension insulator.In this operation process, require ground staff to carry out accurately stay cord and coordinate, whole operation process is loaded down with trivial details, repeatedly, and on bar, operating personnel and Ground Operation personnel will constantly propaganda directed to communicate, adjust insulator position, and the operating time is long, efficiency is low, difficulty is large; And because hook acts on power transmission line, application point is single, in changing the process of insulator,, there is potential safety hazard in the situation that as easy as rolling off a log appearance hook slides on power transmission line.
Summary of the invention
The object of the invention is the deficiency and the defect that for current power transmission track replacement suspension insulator operation process, exist, a kind of instrument of charged for replacement suspension insulator is provided, pulling pin, in displacement and latch process, do not need Ground Operation personnel bracing wire to coordinate, shaft tower personnel can complete alone the pulling pin of suspension insulator, displacement and latch operation, easy and simple to handle, reliable and stable, efficiency is high.
Another object of the present invention is to provide a kind of method of utilizing above-mentioned instrument to carry out the operation of charged for replacement suspension insulator.
To achieve these goals, the technical solution used in the present invention is: a kind of instrument of charged for replacement suspension insulator, comprise frame bracket and the telescopic hitch that described frame bracket top is set, described telescopic hitch comprises adjusting screw and is arranged on the Self-locking hanging hook on described adjusting screw top; Described frame bracket comprises the supporting plate of bottom and the stull at top, and described stull middle part is connected with described adjusting screw bottom, and described supporting plate is connected by two secondary length-adjustable insulated connecting piece with described stull.
Described two secondary length-adjustable insulated connecting piece, wherein the two ends up and down of a secondary insulated connecting piece are fixedly connected with described supporting plate with described stull respectively, and another secondary insulated connecting piece upper end is fixedly connected with described stull, and lower end is flexibly connected with described supporting plate.
Described adjusting screw comprises the threaded portion on top and the unthreaded portion of bottom, described top threaded portion is provided with the collar being threaded, and described adjusting screw is provided with ratchet spanner through the top of the described collar, the described collar is connected with described Self-locking hanging hook, described bottom unthreaded portion is connected by bearing with described stull, and described adjusting screw is provided with locating part through the bottom of described bearing.
Described adjusting screw comprises two sections of upper leading screws that are connected with described Self-locking hanging hook, described stull respectively and lower leading screw, described upper and lower leading screw is positive and negative silk structure, the sleeve that described leading screw has positive and negative silk screw thread by inwall connects, and is provided with adjusting spanner on described sleeve.
The flight pitch of described adjusting screw is 3-5mm, and screw thread oblique angle is 2-5 degree.
Described supporting plate comprises that circular reinforced steel bar ring and right-angled intersection are placed in the steel plate in described reinforced steel bar ring, and described reinforced steel bar ring outside weld is connected to the edge part perpendicular to described reinforced steel bar ring place face, and described edge part is provided with two corresponding open slots.
On described edge part, be provided with connecting through hole, described insulated connecting piece is flexibly connected by the through hole on described edge part with described supporting plate.
Described insulated connecting piece comprises at least 2 insulation pulling plates, lays some through holes on described insulation pulling plate.
Described stull is the Metallic rod that two ends are provided with connecting bolt.
Described stull is the steel plate that two ends have 90 degree flangings.
Utilize above-mentioned instrument to carry out a method for charged for replacement suspension insulator operation, comprise the steps:
1) prepare: operating personnel installs the set of tools of above-mentioned charged for replacement suspension insulator in place, and a reserved side insulated connecting piece does not fill or half dress: one end of insulated connecting piece and stull or supporting plate are rotationally connected;
2) lifting: pole tower operation personnel climb up shaft tower to the cross-arm place of insulator to be replaced top, and the instrument of charged for replacement suspension insulator is reached to the cross-arm place at insulator to be replaced place with transmitting rope, cross-arm operating personnel is hung on the charged for replacement suspension insulator instrument assembling on the cross-arm of insulator to be replaced top by Self-locking hanging hook, by the insulated connecting piece of the already installed side of hand propelled, supporting plate is pushed into the below of insulator to be replaced; If insulator to be replaced is hanging bottle string, supporting plate is placed in to the heavy punch piece below of hanging bottle string insulator, heavy punch piece is put in supporting plate; If insulator to be replaced is generic linear insulator, transmission pressure is placed in the open slot of brace edge part; And then the insulated connecting piece of a uninstalled side is connected with supporting plate with stull, or the insulated connecting piece other end of half dress is connected with supporting plate or stull;
3) promote: cross-arm operating personnel together promotes the frame bracket of described charged for replacement suspension insulator instrument together with heavy punch piece and/or transmission pressure by operation adjusting screw, the relay removal to insulator to be replaced by heavy punch piece and/or transmission pressure;
4) change: cross-arm operating personnel by pulling pin, displacement and latch can complete the replacing of insulator; In this step, the new insulator of changing still adopts conventional transmission method to carry out the transmission on ground and shaft tower with the old insulator of changing;
5) dismounting: after replacing insulator latch fixation, cross-arm operating personnel regulates spanner by operation, adjusting screw is extended, supporting plate departs from heavy punch piece or transmission pressure, remove or open the insulated connecting piece of frame bracket one side, insulator after can making the instrument of charged for replacement suspension insulator depart from change, opens Self-locking hanging hook and carries out the replacing of next insulator by the transmissions cross-arm place that is passed to ground or is passed to above next insulator to be replaced that restricts.
The frame bracket that the present invention adopts top to have telescopic hitch carries out transmission line earth potential live replacing suspension insulator, by supporting plate, power transmission line or weight are held up, the pulling force of power transmission line and weight is transferred to instrument from suspension insulator, be very easy to the replacing of suspension insulator, simple in structure, safe, stable, reliable, efficiency is high.Telescopic hitch, by adopting top to have the adjusting screw structure of Self-locking hanging hook, hangs conveniently, easy and simple to handle, by operation leading screw, can by supporting plate, power transmission line and weight be promoted to certain altitude easily; Supporting plate adopts two secondary length-adjustable insulated connecting piece to be connected with stull, can effective guarantee hold up, lifting process reliable and stable, avoid power transmission line or weight slippage situation to occur, and, insulated connecting piece length is adjustable, be very easy to according to the length of the length adjustment insulated connecting piece of suspension insulator, convenient to the lifting of suspension insulator with stablize spacingly, improve the fail safe of changing insulator in suspension insulator process.The flight pitch of the adjusting screw in the application is 3-5mm, screw thread oblique angle is 2-5 degree, reach the effective coordination of hoisting velocity and rotation efficiency, both improved hoisting velocity, be unlikely to again to make to regulate the rotary manipulation of spanner too to be required great effort, operate light efficiency high, from face, effectively improve the raising efficiency of power transmission line and weight, can be effectively will promote time shorten to original 1/3rd.Adopt the application's charged for replacement suspension insulator instrument and its use operational method, in the pulling pin of insulator, displacement and latch process, cross-arm operating personnel can complete alone, avoided employing traditional approach, the trouble that ground staff need to constantly be propagandaed directed to communicate, be regulated stay cord dynamics to coordinate back and forth by stay cord coordinating operation, make operation easier, reliable and stable, efficiency is high.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described:
Fig. 1 is the structural representation of the embodiment of the present invention one;
Fig. 2 is the structural representation of telescopic hitch in the embodiment of the present invention one;
Fig. 3 is the main TV structure schematic diagram of the embodiment of the present invention two;
Fig. 4 is the perspective view of the embodiment of the present invention two.
Embodiment
Embodiment mono-
As shown in Figure 1 and Figure 2: a kind of instrument of charged for replacement suspension insulator, comprises frame bracket and the telescopic hitch that described frame bracket top is set; Described frame bracket comprises the supporting plate of bottom and the stull 4 at top, and described supporting plate is connected by two secondary length-adjustable insulated connecting piece 6 with described stull.
Each secondary insulated connecting piece 6 comprises 2 insulation pulling plates 61, described insulation pulling plate 61 is for being laid with the strip insulation board structure of some connecting through holes, 61 of insulation pulling plates are placed through in through hole and are connected with the spacing realization of nut spinning by bolt, and select as required the through hole of diverse location to connect, realize the length adjustment of insulated connecting piece; If length is still inadequate, can also existing 2 insulation pulling plates be connected by increasing insulation pulling plate 61, regulate the length of insulated connecting piece 6;
Stull 4 adopts two ends to be provided with the Metallic rod structure of connecting bolt 5, by the connecting bolt 5 at stull 4 two ends is placed through in the through hole of insulated connecting piece 6 upper ends, and screws with nut; Wherein the lower end of a secondary insulated connecting piece 6 is fixedly connected with described supporting plate, one side of the lower end of another secondary insulated connecting piece 6 and described supporting plate is hinged by hinge or rotating shaft 12, realizing its hypomere insulation pulling plate 61 rotates around a side of supporting plate, after supporting plate support power transmission line or weight, by the upset that makes progress, be connected with the insulation pulling plate 61 on top, thereby realize the both sides of supporting plate are imposed to balanced pulling force, improve stability and the load reliability of supporting plate.
Described telescopic hitch comprises adjusting screw 3 and is arranged on the Self-locking hanging hook 1 on described adjusting screw 3 tops, described adjusting screw 3 comprises the threaded portion on top and the unthreaded portion of bottom, described top threaded portion is provided with the collar 10 being threaded, the collar 10 can adopt nut or the female steel pipe cylinder of tool of coupling, described adjusting screw 3 is provided with locating part 9 and ratchet spanner 2 through the top end of the described collar 10, ratchet spanner market purchasing, on the top of adjusting screw 3, weld positive six prisms, ratchet spanner 2 is placed on six prisms, the described collar 10 is connected with described Self-locking hanging hook 1, described bottom unthreaded portion is connected by bearing 11 with described stull 4, and described adjusting screw 3 is provided with locating part 9 through the place, bottom of described bearing 11, described locating part 9 can adopt spacer pin or place the spacing ring of pin.By the collar 10, adjusting screw 3 is connected with self-marketing hook 1, and back and forth pull back and forth by the ratchet spanner 2 on adjusting screw 3 tops, realize the rotation of adjusting screw 3 in the collar 10, realize the ascending motion of adjusting screw 3, adjusting screw 3 lower ends are connected by bearing 10 with stull 4, when effective guarantee leading screw rotates, stull 4 and whole frame bracket do not rotate, and adjusting screw 3 is when the interior rising of the collar 10, drives stull 4 and whole frame bracket to do lifter motion.Described supporting plate comprises that circular reinforced steel bar ring 8 and right-angled intersection are placed in the steel plate 11 in described reinforced steel bar ring 8, and described reinforced steel bar ring 8 outside welds are connected to the edge part 7 perpendicular to described reinforced steel bar ring 8 place faces, and described edge part 7 is provided with two corresponding open slots 14.By welding edge, along part 7, realization is effectively spacing to suspension insulator lower heavy punch, avoids the unnecessary trouble that weight slippage causes in lifting process, and meanwhile, open slot 14 can be contained in power transmission line wherein effectively, avoids slippage.On described edge part 7, be provided with connecting through hole, realize insulated connecting piece and be connected by the through hole on described edge part with described supporting plate, for convenience detach, connect easy.
Embodiment bis-
As shown in Figure 1 and Figure 2: the difference part of the present embodiment and embodiment mono-is:
Described adjusting screw 3 comprises two sections of upper leading screws 31 that are fixedly connected with described Self-locking hanging hook 1, described stull 4 respectively and lower leading screw 32, described upper leading screw 31 and lower leading screw 32 are positive and negative silk structure, described upper leading screw 31 is connected with the sleeve 33 that described lower leading screw 32 has positive and negative silk screw thread by inwall, on described sleeve 33, be provided with and regulate handle 34, described upper leading screw 31 tops and 1 welding of described Self-locking hanging hook, described lower leading screw 32 lower ends and described stull 4 middle part welding.By regulating and controlling handle 34 turnbarrels 33, realize upper and lower leading screw simultaneously to rotatablely moving in sleeve 33, can effectively improve raising efficiency, simultaneously, the flight pitch of described adjusting screw 3 is 3-5mm, and screw thread oblique angle is 2-5 degree, has greatly improved the raising efficiency in operation process.
Described stull 4 adopts two ends to have the steel plate of 90 degree flangings 41, and offers through hole at flanging 41 places, by place bolt 5 in through hole, realizes being connected of stull 4 and insulation pulling plate 61.Described insulated connecting piece 6 wherein lower end insulation pulling plate 61 lower ends of a side is provided with U-shaped hanging part 13, and a side of described U-shaped hanging part 13 is longer than opposite side and is offered the through hole being connected with insulation pulling plate 61 lower ends.By U-shaped hanging part 13 being set in insulated connecting piece 6 lower ends, facilitate opening fast and being connected closure, features simple structure, convenient operation of insulated connecting piece one side.
Embodiment tri-
Utilize above-mentioned instrument to carry out a method for charged for replacement hanging bottle string suspension insulator operation, comprise the steps:
1) prepare: operating personnel installs the set of tools of above-mentioned charged for replacement suspension insulator in place, and a reserved side insulated connecting piece 6 does not fill;
2) lifting: pole tower operation personnel climb up shaft tower to the cross-arm place of insulator to be replaced top, and the instrument of charged for replacement suspension insulator is reached to the cross-arm place at insulator to be replaced place with transmitting rope, cross-arm operating personnel is hung on the charged for replacement suspension insulator instrument assembling on the cross-arm of insulator to be replaced top by Self-locking hanging hook, insulated connecting piece 6 by the already installed side of hand propelled, supporting plate is placed in the heavy punch piece below of hanging bottle string insulator, heavy punch piece is put in supporting plate, and then the insulated connecting piece of a uninstalled side 6 is connected with supporting plate with stull 4,
3) promote: cross-arm operating personnel together promotes the frame bracket of described charged for replacement suspension insulator instrument together with heavy punch piece and transmission pressure by operation adjusting screw 3, the relay removal to insulator to be replaced by heavy punch piece and transmission pressure;
4) change: cross-arm operating personnel by pulling pin, displacement and latch can complete the replacing of insulator; In this step, the new insulator of changing still adopts conventional transmission method to carry out the transmission on ground and shaft tower with the old insulator of changing;
5) dismounting: after replacing insulator latch fixation, cross-arm operating personnel regulates spanner by operation, adjusting screw is extended, supporting plate departs from heavy punch piece and transmission pressure, remove the insulated connecting piece of frame bracket one side, insulator after can making the instrument of charged for replacement suspension insulator depart from change, opens Self-locking hanging hook 3 and carries out the replacing of next insulator by the transmissions cross-arm place that is passed to ground or is passed to above next insulator to be replaced that restricts.
Embodiment tetra-
Utilize above-mentioned instrument to carry out a method for charged for replacement generic linear suspension insulator operation, comprise the steps:
1) prepare: operating personnel installs the set of tools of above-mentioned charged for replacement suspension insulator in place, and reserved side insulated connecting piece 6 half dresses, one end of insulated connecting piece 6 and stull or supporting plate are hinged, and the other end does not connect;
2) lifting: pole tower operation personnel climb up shaft tower to the cross-arm place of insulator to be replaced top, and the instrument of charged for replacement suspension insulator is reached to the cross-arm place at insulator to be replaced place with transmitting rope, cross-arm operating personnel is hung on the charged for replacement suspension insulator instrument assembling on the cross-arm of insulator to be replaced top by Self-locking hanging hook, by the insulated connecting piece 6 of the already installed side of hand propelled, supporting plate is pushed into the below of insulator to be replaced; The transmission pressure of insulator to be replaced below is placed in the open slot 14 of brace edge part 7, and the other end of the insulated connecting piece 6 of half dress is connected with supporting plate or stull 4;
3) promote: cross-arm operating personnel together promotes the frame bracket of described charged for replacement suspension insulator instrument together with heavy punch piece and transmission pressure by operation adjusting screw 3, the relay removal to insulator to be replaced by heavy punch piece and transmission pressure;
4) change: cross-arm operating personnel by pulling pin, displacement and latch can complete the replacing of insulator; In this step, the new insulator of changing still adopts conventional transmission method to carry out the transmission on ground and shaft tower with the old insulator of changing;
5) dismounting: after replacing insulator latch fixation, cross-arm operating personnel regulates spanner by operation, adjusting screw is extended, supporting plate departs from transmission pressure, open the insulated connecting piece 6 of frame bracket one side, insulator after can making the instrument of charged for replacement suspension insulator depart from change, opens Self-locking hanging hook 3 and carries out the replacing of next insulator by the transmissions cross-arm place that is passed to ground or is passed to above next insulator to be replaced that restricts.
Claims (10)
1. the instrument of a charged for replacement suspension insulator, it is characterized in that: it comprises frame bracket and the telescopic hitch that described frame bracket top is set, described telescopic hitch comprises adjusting screw and is arranged on the Self-locking hanging hook on described adjusting screw top; Described frame bracket comprises the supporting plate of bottom and the stull at top, and described stull middle part is connected with described adjusting screw bottom, and described supporting plate is connected by two secondary length-adjustable insulated connecting piece with described stull.
2. the instrument of charged for replacement suspension insulator as claimed in claim 1, it is characterized in that: described two secondary length-adjustable insulated connecting piece, wherein the two ends up and down of a secondary insulated connecting piece are fixedly connected with described supporting plate with described stull respectively, another secondary insulated connecting piece upper end is fixedly connected with described stull, and lower end is flexibly connected with described supporting plate.
3. the instrument of charged for replacement suspension insulator as claimed in claim 1, it is characterized in that: described adjusting screw comprises the threaded portion on top and the unthreaded portion of bottom, described top threaded portion is provided with the collar being threaded, and described adjusting screw is provided with ratchet spanner through the top of the described collar, the described collar is connected with described Self-locking hanging hook, described bottom unthreaded portion is connected by bearing with described stull, and described adjusting screw is provided with locating part through the bottom of described bearing.
4. the instrument of charged for replacement suspension insulator as claimed in claim 1, it is characterized in that: described adjusting screw comprises two sections of upper leading screws that are connected with described Self-locking hanging hook, described stull respectively and lower leading screw, described upper and lower leading screw is positive and negative silk structure, the sleeve that described leading screw has positive and negative silk screw thread by inwall connects, and is provided with adjusting spanner on described sleeve.
5. the instrument of the charged for replacement suspension insulator as described in claim 3 or 4, is characterized in that: the flight pitch of described adjusting screw is 3-5mm, and screw thread oblique angle is 2-5 degree.
6. the instrument of charged for replacement suspension insulator as claimed in claim 1 or 2 or 3 or 4, it is characterized in that: described supporting plate comprises that circular reinforced steel bar ring and right-angled intersection are placed in the steel plate in described reinforced steel bar ring, described reinforced steel bar ring outside weld is connected to the edge part perpendicular to described reinforced steel bar ring place face, described edge part is provided with two corresponding open slots, on described edge part, be provided with connecting through hole, described insulated connecting piece is flexibly connected by the through hole on described edge part with described supporting plate.
7. the instrument of charged for replacement suspension insulator as claimed in claim 1 or 2 or 3 or 4, is characterized in that: described insulated connecting piece comprises at least 2 insulation pulling plates, lays some through holes on described insulation pulling plate.
8. the instrument of charged for replacement suspension insulator as claimed in claim 1 or 2 or 3 or 4, is characterized in that: described stull is the Metallic rod that two ends are provided with connecting bolt.
9. the instrument of charged for replacement suspension insulator as claimed in claim 1 or 2 or 3 or 4, is characterized in that: described stull is the steel plate that two ends have 90 degree flangings.
10. utilize above-mentioned instrument to carry out a method for charged for replacement suspension insulator operation, comprise the steps:
1) prepare: operating personnel installs the set of tools of above-mentioned charged for replacement suspension insulator in place, and a reserved side insulated connecting piece does not fill or half dress: one end of insulated connecting piece and stull or supporting plate are rotationally connected;
2) lifting: pole tower operation personnel climb up shaft tower to the cross-arm place of insulator to be replaced top, and the instrument of charged for replacement suspension insulator is reached to the cross-arm place at insulator to be replaced place with transmitting rope, cross-arm operating personnel is hung on the charged for replacement suspension insulator instrument assembling on the cross-arm of insulator to be replaced top by Self-locking hanging hook, by the insulated connecting piece of the already installed side of hand propelled, supporting plate is pushed into the below of insulator to be replaced; If insulator to be replaced is hanging bottle string, supporting plate is placed in to the heavy punch piece below of hanging bottle string insulator, heavy punch piece is put in supporting plate; If insulator to be replaced is generic linear insulator, transmission pressure is placed in the open slot of brace edge part; And then the insulated connecting piece of a uninstalled side is connected with supporting plate with stull, or the insulated connecting piece other end of half dress is connected with supporting plate or stull;
3) promote: cross-arm operating personnel together promotes the frame bracket of described charged for replacement suspension insulator instrument together with heavy punch piece and/or transmission pressure by operation adjusting screw, the relay removal to insulator to be replaced by heavy punch piece and/or transmission pressure;
4) change: cross-arm operating personnel by pulling pin, displacement and latch can complete the replacing of insulator; In this step, the new insulator of changing still adopts conventional transmission method to carry out the transmission on ground and shaft tower with the old insulator of changing;
5) dismounting: after replacing insulator latch fixation, cross-arm operating personnel regulates spanner by operation, adjusting screw is extended, supporting plate departs from heavy punch piece or transmission pressure, remove or open the insulated connecting piece of frame bracket one side, insulator after can making the instrument of charged for replacement suspension insulator depart from change, opens Self-locking hanging hook and carries out the replacing of next insulator by the transmissions cross-arm place that is passed to ground or is passed to above next insulator to be replaced that restricts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410343363.5A CN104167687B (en) | 2014-07-18 | 2014-07-18 | Tool for live-line replacement of suspension insulator and using working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410343363.5A CN104167687B (en) | 2014-07-18 | 2014-07-18 | Tool for live-line replacement of suspension insulator and using working method thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN104167687A true CN104167687A (en) | 2014-11-26 |
| CN104167687B CN104167687B (en) | 2017-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410343363.5A Active CN104167687B (en) | 2014-07-18 | 2014-07-18 | Tool for live-line replacement of suspension insulator and using working method thereof |
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| CN107293997A (en) * | 2017-08-04 | 2017-10-24 | 江西电力职业技术学院 | Suspension insulator changes hook and replacing device for insulator |
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