CN106410669B - A kind of angle continuously adjustabe screw self-locking type ultra-high-tension power transmission line earthing clamp - Google Patents
A kind of angle continuously adjustabe screw self-locking type ultra-high-tension power transmission line earthing clamp Download PDFInfo
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- CN106410669B CN106410669B CN201610928453.XA CN201610928453A CN106410669B CN 106410669 B CN106410669 B CN 106410669B CN 201610928453 A CN201610928453 A CN 201610928453A CN 106410669 B CN106410669 B CN 106410669B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
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Abstract
The invention discloses a kind of angle continuously adjustabe screw self-locking type ultra-high-tension power transmission line earthing clamp, belong to high-voltage power line conductive line earthing tool.The present invention includes frame, drive mechanism and transmission mechanism.Frame includes hue angle frame, hook, vertical center web, angle adjustment arc chute and horizontal connecting plate；Drive mechanism is drive shaft, bevel gear with axes at right angles and bidirectional screw mechanism, and bevel gear with axes at right angles includes drive bevel gear and dynamic bevel gear, and bidirectional screw mechanism includes bidirectional screw leading screw and spigot nut, positioning sliding groove is provided with spigot nut；Transmission mechanism includes directive slide track, wire clamp pressure head and scissors mechanism.Self-locking performance of the present invention is strong, and clamping is stable, good to wire, shaft tower type and operation position adaptability with respect to action bars angle continuously adjustabe, and operating efficiency is high, and maintainer's operation intensity can be greatly reduced.This wire clamp is not only suitable for ultra-high-tension power transmission line tangent tower, is also applied for the operation of anchor support.
Description
Technical field
The present invention relates to high-voltage power line conductive line earthing tool technical field, especially a kind of angle continuously adjustabe spiral
Self-locking type high voltage power transmission line ground wire presss from both sides.
Background technology
With the development of China's high-voltage fence, in transmission line of electricity interruption maintenance, maintenance department's installing ground wire is to ensure circuit
The basic guarantee of interruption maintenance personnel's personal safety.The traditional earthing clamp used in engineering maintenance at present mainly has spring pressure
Compact form, tongue type compression type, clamp compression type, spiral compression formula this four class, but design and many problems, such as self-locking property be present
Difference, operating efficiency is not high, and adaptability is not high.There has been no solve angle between action bars and wire clamp well on domestic online sandwiched meter
The technical problem of continuously adjustabe is spent, it is not firm in the presence of mounting in engineer applied, it is easy to fall off, or to lead location, operation position
And power transmission tower frame bad adaptability, operation labor intensity it is big phenomena such as, earthing clamp, which comes off, causes maintainer to lose safe guarantor
The situation of shield happens occasionally.It is a large amount of to take maintainer for dismounting safety measure when safety measure and power transmission are done before interruption maintenance
Time and efforts so that mounting and dismounting ground wire work as whole interruption maintenance, rush to repair work " bottleneck ".Due to tradition
The action bars of wire clamp can not realize angle continuously adjustabe with wire clamp structure body portion angle so that maintainer often can only be by wire clamp
Be articulated in anchor support wire jumper, or it is artificial climb out of after strain insulator string to strain insulator circuit hanger ground wire, great safety be present
Risk, and have the suspicion for violating safety.Therefore, it is badly in need of that a kind of angle continuously adjustabe, self-locking performance are strong, adaptability is good in engineering construction
Ultra-high-tension power transmission line earthing clamp, to accelerate to hang, the speed of ground wire, mitigate the manipulation strength of maintainer, improve circuit
Overhaul efficiency.
The content of the invention
The purpose of the present invention is to be directed to above-mentioned the shortcomings of the prior art, there is provided a kind of self-locking performance is strong, and clamping is stable, phase
Good to wire, shaft tower type and operation position adaptability to action bars angle continuously adjustabe, operating efficiency is high, can be greatly reduced
The earthing clamp of the ultra-high-tension power transmission line of maintainer's operation intensity.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：
A kind of angle continuously adjustabe screw self-locking type ultra-high-tension power transmission line earthing clamp, including frame, drive mechanism and biography
Motivation structure, it is characterised in that：The frame includes hue angle frame, hook, vertical center web, angle adjustment arc chute and water
Flushconnection plate；The drive mechanism is drive shaft, bevel gear with axes at right angles and bidirectional screw mechanism, and bevel gear with axes at right angles includes active conical tooth
Wheel and dynamic bevel gear, bidirectional screw mechanism include bidirectional screw leading screw and spigot nut, and positioning is provided with spigot nut and is slided
Dynamic groove；The transmission mechanism includes directive slide track, wire clamp pressure head and scissors mechanism；
The drive shaft is fixed by the bearing block support in hue angle frame, and one end of drive shaft is connected with action bars, separately
One end is connected with the drive bevel gear of bevel gear with axes at right angles, the lower end of bidirectional screw leading screw and the dynamic bevel gear phase of bevel gear with axes at right angles
Connect and be assemblied on the bearing block of hue angle frame, the upper end of bidirectional screw leading screw there are two sections of screw threads, and two sections of screw threads are split anti-
To every section of screw thread is equipped with spigot nut and forms screw pair, and bidirectional screw leading screw is by the bearing block support on horizontal connecting plate
It is fixed；One end of horizontal connecting plate is connected with vertical center web, and the other end passes through the angle on locking bolt and hue angle frame
Adjustment arc chute is engaged；
The hook is assemblied on vertical center web, and directive slide track is assemblied on hook, and wire clamp pressure head is assemblied in guiding and slided
Rail forms prismatic pair, and scissors mechanism has two scissor arms, and one end of two scissor arms is respectively by sliding pin and spigot nut
Positioning sliding groove be engaged, action bars drives drive shaft turns when rotating, and drive shaft driving bevel gear with axes at right angles drives two-way spiral shell
Leading screw rotation is revolved, with the rotation of bidirectional screw leading screw, spigot nut or by screw pair while to both ends move inward, and is oriented to
Nut screw pair is to both ends or inwardly while mobile then driving scissors mechanism realizes open and close movement, the other end point of two scissor arms
One end not with two connecting rods is hinged, and the one end of the other ends of two connecting rods respectively with wire clamp pressure head is hinged, and passes through scissors mechanism
Opening and closing realize that wire clamp pressure head loosens, tighten action along directive slide track.
Further, the gearratio of the bevel gear with axes at right angles is 1：1.5, bevel gear with axes at right angles selection designs compared with close steps,
Higher operating efficiency is realized, mitigates the workload of maintainer.
Further, the scissor arms of scissors mechanism are designed using non-straight-arm, and every scissor arms include front cross-arm with after respectively
Yoke, the angle of the front cross-arm of every scissor arms and rear yoke is 1600-1700.Front cross-arm is with rear yoke by increasing journey target design
Into smaller ratio, wire clamp operating efficiency can be improved, mitigates maintainer's operation element amount.
Further, the hook body portion of the hook is designed with 600Sector conductor clamp area, led when wire clamp pressure head clamps
Line, wire are located in sector conductor clamp area, hook the relatively adjacent other parts position concavity for hooking body in body sector clamp area, folder
Hold area both ends and then form boss, when tightening or unclamping wire clamp, wire clamp is often swung, and now clamp area both ends boss moves to wire
Effect of contraction has been moved, then has realized support to wire clamp power, tightening or unclamp beneficial to wire clamp.Meanwhile matrix clamp area have it is adaptive
It should design, improve the grip conditions to wire.
Further, the wide conductive contact areas of 2 ~ 4mm are designed with the middle part of the hook body wire clamp area of hook, are fanned positioned at body is hooked
In shape clamp area, along fan section inner arc intermediate distribution, in banding.When wire clamp pressure head clamps wire, wire can be improved with hooking
The contact condition of body clamp area, in the presence of chucking power, because elastic properties of materials deforms, then wire contact with conductive contact area
State is changed into face contact from a contact, increases contact area, ensures wire clamp good conductive state.Meanwhile hook and wire clamp pressure head
Clamping face carry out adaptive design, edge curved surface is designed using large curved surface, and improvement wire clamp is to the folder of different angle inlet wire wire
Hold state.Hook end is more conducive to wire and slipped into wire clamp hook body wire clamp area using shape design of turning up when mounting wire.
Further, one end that the horizontal connecting plate is engaged with angle adjustment arc chute is provided with positioning spiro pit,
Positioning spiro pit is configured with positioning threads mouth screw pair, and locking bolt passes through the angle adjustment arc chute of hue angle frame with determining
Position screw thread mouth screw pair is connected, and drives horizontal connecting plate to be moved along angle adjustment arc chute, and be tightened in needs
Position, realize wire clamp hook portion with action bars axis -900~+900Between continuous adjustable angle, to improve wire clamp to high pressure
The adaptability of transmission tower, different conductor inlet wire angle and different operating station.
Further, the junction of the drive shaft and control stick is quick switching joint.
Further, the angle adjustment scope of the angle adjustment arc chute is 0 ~ 180 °.
Further, the material of main part of the angle continuously adjustabe screw self-locking type ultra-high-tension power transmission line earthing clamp is
7075 aluminium alloys, the scissor arms material of the scissors mechanism is 304 stainless steels.
Further, the bevel gear with axes at right angles is straight bevel gear, material 45Cr.
Beneficial effect：1. it is constant using bevel gear with axes at right angles axis relative position, when wherein an axis rotates around another axis,
The constant meshing characteristic of its meshing condition, it can conveniently realize action bars axis with wire clamp angle -900~+900Polarizers of big angle scope
Continuously adjustabe, adaptability of the wire clamp to various high-voltage conducting wires positions, different power transmission tower frames and different operating station is significantly improved, expanded
The application that big wire clamp overhauls in various ultra-high-tension power transmission lines.
2. small gearratio bevel gear pair design improves the velocity of rotation of screw, the design of high-lift screw improves
Be driven stroke, small arm before and after than scissors mechanism design play mechanism increase Cheng Xiaoying, by this 3 aspect innovation design, greatly
Width improve wire clamp transmission efficiency, significantly mitigate maintainer's labor intensity, action bars need to only rotate 1 ~ 2 circle can complete clamp and
Release acts.
3. utilizing spiral self-locking principle and condition, the auto-lock function of wire clamp is realized by screw self-locking, improves maintenance
The reliability and security of work.Compared with traditional wire clamp, its remarkable advantage is maintainer's labor intensity is both greatly reduced,
Also the security of operation is taken into account.
4. the wire clamp area of hook and wire clamp pressure head uses the adaptive designs such as edge large curved surface, improve to transmission pressure
Diverse location and the adaptability in direction, reduce when wire clamp clamps and the probability of " void folder " phenomenon occur.
5. the matching design of reverse double-helix leading screw and scissor transmission mechanism, no interference and dead point phenomenon, ensure scissor machine
The folding uniformity of structure two-arm, scissors mechanism uniform force is symmetrical, so as to ensure that movement of the wire clamp pressure head in directive slide track
Smoothness, avoids the occurrence of catching phenomenon, and chucking power is big, it is ensured that the stability and reliability of clamping process.
In summary, earthing clamp self-locking performance of the invention is strong, and clamping is stable, right with respect to action bars angle continuously adjustabe
Wire, shaft tower type and operation position adaptability are good, and operating efficiency is high, and the high pressure that maintainer's operation intensity can be greatly reduced is defeated
The earthing clamp of electric line, solve traditional wire and be clipped in mounting hardly possible on anchor support cross-arm, the not high technical barrier of mounting reliability is full
The operation requirement of the different turriforms of foot and construction station, and can be carried with convenient changing wire clamp and the insulating bar joint of electroscope
High Earthing Reliability and installation efficiency.
Brief description of the drawings
Fig. 1 is the present invention（Wire clamp angle 00）Schematic diagram.
Fig. 2 is the present invention（Wire clamp angle 900）Front view.
Fig. 3 is the present invention（Wire clamp angle 00）Top view.
Fig. 4 is the bevel gear pair with axes at right angles and angle adjustment arc chute assembling schematic diagram of the present invention.
Fig. 5 is the bidirectional screw leading screw stereogram of the present invention.
Fig. 6 is the angle-adjusting machine frame stereogram of the present invention.
Fig. 7 is the scissors mechanism schematic diagram of the present invention.
Fig. 8 is the wire clamp pressure head stereogram of the present invention.
Fig. 9 is the present invention（Wire clamp angle 00）Strabismus stereogram.
Figure 10 is the present invention（Wire clamp angle -900）Axle parallax stereogram.
Figure 11 is the present invention（Wire clamp angle 900）Axle parallax stereogram.
Marked in figure：1- hue angle frames, 2- hooks, 3- vertical center webs, 4- angle adjustment arc chutes, 5-, which is oriented to, to be slided
Rail, 6- wire clamp pressure heads, 7- scissors mechanisms, 8- drive shafts, 9- bevel gear with axes at right angles, 10- bidirectional screw leading screws, 11- spigot nuts,
12- horizontal connecting plates, 13- positioning sliding grooves.
Embodiment
With reference to specific embodiment, the invention will be further described.
As shown in Figure 1 to 11, a kind of angle continuously adjustabe screw self-locking type ultra-high-tension power transmission line of the invention ground wire
Folder, including frame, drive mechanism and transmission mechanism, frame include hue angle frame 1, hook 2, vertical center web 3, angle adjustment
Arc chute 4 and horizontal connecting plate 12；Drive mechanism is drive shaft 8, bevel gear with axes at right angles 9 and bidirectional screw mechanism, orthogonal cone tooth
Wheel 9 is engaged by drive bevel gear with dynamic bevel gear to be formed, and bevel gear pair gearratio is 1：1.5, bidirectional screw mechanism includes double
To screw 10 and spigot nut 11, positioning sliding groove 13 is provided with spigot nut 11；Transmission mechanism includes directive slide track
5th, wire clamp pressure head 6 and scissors mechanism 7.
Wherein, the hook body portion for linking up with 2 is designed with 600Sector conductor clamp area, wire clamp pressure head 6 and hook body wire clamp area
Middle part is designed with 3mm conductive contact area, and 2 ends of hook are shape of turning up.The angle adjustment scope of angle adjustment arc chute 4
For 0 ~ 180 °.The material of main part of the present invention is 7075 aluminium alloys, and the scissor arms material of scissors mechanism 7 therein is 304 stainless steels,
Bevel gear with axes at right angles 9 is straight bevel gear, material 45Cr.
The assembly method and action principle of the present invention is as follows：
2 bearing blocks are assembled in hue angle frame 1, for assembling and supporting drive shaft 8, one end of drive shaft 8 passes through fast
Fast crossover sub is connected with insulating bar, and insulating bar rotary power passes to wire clamp by drive shaft 8, and drive shaft 8 is another
Assemble the drive bevel gear of bevel gear with axes at right angles 9 in one end.Hue angle frame 1 is provided with bearing hole, the lower end of bidirectional screw leading screw 10
Assemble the dynamic bevel gear of bevel gear with axes at right angles 9 and be assemblied in the bearing hole of hue angle frame 1, the upper end of bidirectional screw leading screw 10 has
Two sections of screw threads, two sections of screw threads are reversely equipped with a spigot nut 11 and form screw pair to be split on every section of screw thread, each to be oriented to
Positioning sliding groove 13 is provided with the homonymy of nut 11, because screw thread is reverse each other, when bidirectional screw leading screw 10 rotates, spigot nut
11 are inwardly or outwardly moved simultaneously by screw pair.The upper end of bidirectional screw leading screw 10 is by the bearing block branch on horizontal connecting plate 12
Hold fixation.
Hook 2 is assemblied on vertical center web 3, and directive slide track 5 is assemblied on hook 2, and wire clamp pressure head 6 is assemblied in guiding and slided
Rail 5 forms prismatic pair.Scissors mechanism 7 has two scissor arms, and scissor arms are designed using non-straight-arm, before every scissor arms include respectively
Yoke and rear yoke, by hinge, the angle of front cross-arm and rear yoke is 1650.The front cross-arm of scissors mechanism 7 is designed with
Sliding pin, sliding pin, which is assemblied in the positioning sliding groove 13 of spigot nut 11, forms prismatic pair.When bidirectional screw leading screw 10 rotates, it is oriented to
Nut 11 moves in or out simultaneously when, positioning sliding groove 13 constrains the front cross-arm sliding pin of scissors mechanism 7 along bidirectional screw silk
The motion of the axis direction of thick stick 10, front cross-arm sliding pin can only move along the positioning sliding groove 13 on spigot nut 11, spigot nut
11 movement then drives the folding of scissors mechanism 7.
Yoke tail end and two connecting rod one end pass through hinge, the other end of two connecting rods respectively after two of scissor arms
Then one end with wire clamp pressure head 6 is hinged together.When 7 folding of scissors mechanism, then wire clamp pressure head 6 is driven to be slided along guiding by connecting rod
Rail 5 moves, and realizes release or the pinching action of wire clamp.One end of horizontal connecting plate 12 is connected by screw with vertical center web 3
One is formed, the other end is then designed with screw seat, and locking bolt passes through angle adjustment arc chute from the side of hue angle frame 1
4 form screw thread with the screw seat of horizontal connecting plate 12 coordinates, and locking bolt can drive horizontal connecting plate 12 and attached thereon after unclamping
Bidirectional screw mechanism, scissors mechanism 7, vertical center web 3 and the hook parts such as 2 of band rotate along angle adjustment arc chute 4, real
Angle is showed between wire clamp and action bars axis -900~+900In the range of continuously adjustabe.When being transferred to required work angle, screw
Wire clamp can then be fixed on required angle by locking bolt.
During using a kind of angle continuously adjustabe screw self-locking type ultra-high-tension power transmission line earthing clamp of the present invention, by line
Press from both sides drive shaft 8 to be arranged on insulating bar by quick switching joint, by revolving after unclamping locking bolt adjustment wire clamp angle
Tightly, rotation process bar drives drive shaft 8 and the drive bevel gear of bevel gear with axes at right angles 9 to rotate, and drive bevel gear is then driven by mantle
Gear and the common rotation of bidirectional screw leading screw 10, bidirectional screw leading screw 10 rotate drive 2 spigot nuts 11 simultaneously outwards or to
Interior movement.Spigot nut 11 drives scissors mechanism 7 to open or close by positioning sliding groove 13, and scissors mechanism 7 is then driven by connecting rod
Wire clamp pressure head 6 moves along directive slide track 5.When clockwise shearing action bars, pressure head 6 hooks body side along directive slide track 5 to wire clamp
To movement, wire is pressed in the wire sector clamp area for hooking body, realizes the clamping to transmission pressure.Conversely, when counterclockwise
Action bars is twisted, pressure head 6 moves along directive slide track 5 away from body is hooked, then realizes the release of the clamping to transmission pressure.Due to orthogonal
Speed(-)up effect, the high-lift of the spiral of bidirectional screw leading screw 10 of the close steps of bevel gear 9 act on and the increasing journey of scissors mechanism 7 effect
Fruit, the operating efficiency of wire clamp can be greatly improved, significantly reduce maintainer's labor intensity.
Claims (8)
1. a kind of angle continuously adjustabe screw self-locking type ultra-high-tension power transmission line earthing clamp, including frame, drive mechanism and transmission
Mechanism, it is characterised in that：The frame includes hue angle frame（1）, hook（2）, vertical center web（3）, angle adjustment arc
Chute（4）And horizontal connecting plate（12）；The drive mechanism is drive shaft（8）, bevel gear with axes at right angles（9）With bidirectional screw mechanism,
Bevel gear with axes at right angles（9）Including drive bevel gear and dynamic bevel gear, bidirectional screw mechanism includes bidirectional screw leading screw（10）With lead
To nut（11）, spigot nut（11）On be provided with positioning sliding groove（13）；The transmission mechanism includes directive slide track（5）, line
Clamp head（6）And scissors mechanism（7）；
The drive shaft（8）By hue angle frame（1）On bearing block support fix, drive shaft（8）One end and action bars phase
Even, the other end and bevel gear with axes at right angles（9）Drive bevel gear be connected, bidirectional screw leading screw（10）Lower end and bevel gear with axes at right angles
（9）Dynamic bevel gear be connected and be assemblied in hue angle frame（1）Bearing block on, bidirectional screw leading screw（10）Upper end have two
Section screw thread, for two sections of screw threads to be split reverse, every section of Screw assembly has spigot nut（11）Form screw pair, bidirectional screw leading screw
（10）By horizontal connecting plate（12）On bearing block support fix；Horizontal connecting plate（12）One end and vertical center web（3）Phase
Even, the other end passes through locking bolt and hue angle frame（1）On angle adjustment arc chute（4）It is engaged；
The hook（2）It is assemblied in vertical center web（3）On, directive slide track（5）It is assemblied in hook（2）On, wire clamp pressure head（6）Dress
Assigned in directive slide track（5）Form prismatic pair, scissors mechanism（7）There are two scissor arms, one end of two scissor arms passes through cunning respectively
Dynamic pin and spigot nut（11）On positioning sliding groove（13）It is engaged, action bars drives drive shaft when rotating（8）Rotate, driving
Axle（8）Drive bevel gear with axes at right angles（9）Drive bidirectional screw leading screw（10）Rotation, with bidirectional screw leading screw（10）Rotation, lead
To nut（11）Or by screw pair while to both ends move inward, spigot nut（11）Screw pair to both ends or inwardly same time shift
It is dynamic then drive scissors mechanism（7）Realize open and close movement, the one end of the other ends of two scissor arms respectively with two connecting rods is hinged, and two
The other end of root connecting rod respectively with wire clamp pressure head（6）One end be hinged, pass through scissors mechanism（7）Opening and closing realize wire clamp pressure
Head（6）Along directive slide track（5）Loosen, tighten action；
The hook（2）Hook body portion be designed with 600Sector conductor clamp area；The hook（2）Hook body wire clamp area in
Portion is designed with 3mm conductive contact area, hook（2）End is shape of turning up.
2. angle continuously adjustabe screw self-locking type ultra-high-tension power transmission line earthing clamp according to claim 1, its feature exist
In：
The bevel gear with axes at right angles（9）Gearratio be 1：1.5.
3. angle continuously adjustabe screw self-locking type ultra-high-tension power transmission line earthing clamp according to claim 1, its feature exist
In：Scissors mechanism（7）Scissor arms designed using non-straight-arm, every scissor arms include front cross-arm and rear yoke respectively, and every is cut
The angle of the front cross-arm of yoke and rear yoke is 1600~1700。
4. angle continuously adjustabe screw self-locking type ultra-high-tension power transmission line earthing clamp according to claim 1, its feature exist
In：The horizontal connecting plate（12）With angle adjustment arc chute（4）The one end being engaged is provided with positioning spiro pit, positioning threads
Hole is configured with positioning threads mouth screw pair, and locking bolt passes through hue angle frame（1）Angle adjustment arc chute（4）With positioning
Screw thread mouth screw pair is connected, and drives horizontal connecting plate（12）Along angle adjustment arc chute（4）It is mobile, realize wire clamp hook portion
Divide with action bars axis -900~+900Between continuous adjustable angle.
5. angle continuously adjustabe screw self-locking type ultra-high-tension power transmission line earthing clamp according to claim 1, its feature exist
In：The drive shaft（8）Junction with control stick is quick switching joint.
6. angle continuously adjustabe screw self-locking type ultra-high-tension power transmission line earthing clamp according to claim 1, its feature exist
In：The angle adjustment arc chute（4）Angle adjustment scope be 0 ~ 180 °.
7. angle continuously adjustabe screw self-locking type ultra-high-tension power transmission line earthing clamp according to claim 1, its feature exist
In：The material of main part of the angle continuously adjustabe screw self-locking type ultra-high-tension power transmission line earthing clamp is 7075 aluminium alloys, described
Scissors mechanism（7）Scissor arms material be 304 stainless steels.
8. angle continuously adjustabe screw self-locking type ultra-high-tension power transmission line earthing clamp according to claim 1, its feature exist
In：The bevel gear with axes at right angles（9）For straight bevel gear, material 45Cr.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610928453.XA CN106410669B (en) | 2016-10-31 | 2016-10-31 | A kind of angle continuously adjustabe screw self-locking type ultra-high-tension power transmission line earthing clamp |
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|---|---|---|---|
| CN201610928453.XA CN106410669B (en) | 2016-10-31 | 2016-10-31 | A kind of angle continuously adjustabe screw self-locking type ultra-high-tension power transmission line earthing clamp |
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| CN106410669B true CN106410669B (en) | 2018-01-02 |
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| CN106410669A (en) | 2017-02-15 |
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