CN107230946B - A kind of route foreign body eliminating apparatus based on unmanned plane - Google Patents
A kind of route foreign body eliminating apparatus based on unmanned plane Download PDFInfo
- Publication number
- CN107230946B CN107230946B CN201710642780.3A CN201710642780A CN107230946B CN 107230946 B CN107230946 B CN 107230946B CN 201710642780 A CN201710642780 A CN 201710642780A CN 107230946 B CN107230946 B CN 107230946B
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- Prior art keywords
- unmanned plane
- foreign matter
- clip
- saw
- foreign body
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- 230000007246 mechanism Effects 0.000 claims abstract description 25
- 238000004140 cleaning Methods 0.000 claims abstract description 22
- 230000005540 biological transmission Effects 0.000 abstract description 21
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000000873 masking effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 208000032365 Electromagnetic interference Diseases 0.000 description 1
- 244000273618 Sphenoclea zeylanica Species 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003447 ipsilateral effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- 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
-
- B08B1/10—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/04—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member
- B26D1/06—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/04—Helicopters
- B64C27/08—Helicopters with two or more rotors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D47/00—Equipment not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
- B64U10/00—Type of UAV
- B64U10/10—Rotorcrafts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
- B64U2101/00—UAVs specially adapted for particular uses or applications
Abstract
The invention discloses a kind of route foreign body eliminating apparatus based on unmanned plane, including unmanned plane deliver mechanism and foreign matter cleaning machine；It includes unmanned plane and the clip being arranged on the unmanned plane and the control unit for controlling the clip opening and closing that the unmanned plane, which delivers mechanism,；The both ends of the foreign matter cleaning machine are connected separately with insulating cord.Operation of the present invention is simple, safe and reliable, high-efficient and at low cost, and the foreign matter on power transmission line can be effectively removed in electrification, space is had a vast market, suitable for wideling popularize application.
Description
Technical field
The present invention relates to transmission line of electricity maintenance and operation equipment, relate in particular to a kind of route foreign matter removing dress based on unmanned plane
It sets.
Background technique
It is larger by external environment influence since overhead transmission line is run in the natural environment for a long time.And in numerous prestige
In the factor for coercing line security operation, foreign matter failure is to cause the one of the major reasons of power line short-circuit tripping, is removed in time
Foreign matter can effectively prevent power grid accident.
To guarantee that transmission line safety stable operation, power supply are reliable and reduce the unplanned frequency of power cut of equipment, remove different
Object is generally operated in the energized state, i.e. band electrical clean-up foreign matter.
Previous processing is led, ground wire is all manually to enter line conductor highfield to carry out on-line treatment, and operating personnel is not only
Labor intensity is high, time-consuming and live-working safety risk is big.And currently directly to carry Work tool clear for the unmanned plane that largely uses
Reason is led, ground wire foreign matter takes a long time, unmanned machine battery, operation difficulty are needed to change during operation big, low efficiency and misoperation are easy
Cause line discharge, conduction.It is therefore desirable to develop it is a kind of flexibly, quickly, reliable, labour-saving removes indirectly with conductance, ground wire
Foreign matter apparatus for work.
Summary of the invention
It, can be in electrification feelings technical problem to be solved by the invention is to provide a kind of easy to operate, safe and reliable, high-efficient
The route foreign body eliminating apparatus based on unmanned plane of the foreign matter on power transmission line is effectively removed under condition.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme: a kind of route foreign matter based on unmanned plane
Remove device, including unmanned plane deliver mechanism and foreign matter cleaning machine；
It includes unmanned plane and the clip being arranged on the unmanned plane and for controlling that the unmanned plane, which delivers mechanism,
State the control unit of clip opening and closing；
The both ends of the foreign matter cleaning machine are connected separately with insulating cord.
Further, the foreign matter cleaning machine is band saw, and the band saw is successively hinged and connected by multiple saw plates and is constituted, institute
The length direction both ends along the band saw for stating saw plate are respectively equipped with sawtooth.
Further, the cutting edge of the sawtooth is parallel to the thickness direction of the saw plate.
Further, hinged by two connection straps between the two neighboring saw plate, two connection straps distinguish position
In the width direction two sides of the band saw, and the both ends of the connection strap pass through rivet respectively and are hinged on the two neighboring saw plate
On.
Further, the foreign matter cleaning machine is hook.
Further, the insulating cord is connect by electric wire connecting junction with the foreign matter cleaning machine, and the electric wire connecting junction is by two
The becket bridle being mutually pivotally connected is constituted.
Further, the bottom of the unmanned plane is equipped with anti-electromagnetic interference shielding casing, and described control unit includes power supply
Module, micromotor, drive mechanism, signal receiving module, drum, insulated wire and insulated hollow bar, the insulated hollow bar
Upper end connection on the housing, the clip is connected to the lower end of the insulated hollow bar, and clip is arranged with this
On the unmanned plane, the power module, micromotor, drive mechanism, signal receiving module and drum are arranged at institute
It states in shell, the power module and the signal receiving module are connect with the micromotor, and the micromotor passes through institute
It states drive mechanism to connect with the drum, the insulated wire is wound around on the drum, and the free end of the insulated wire passes through institute
Insulated hollow bar is stated to connect with the clip.
Further, the shell is made of anti-EMI shield, and described control unit further includes that signal connects
Receive module.
Further, the unmanned plane is equipped with high-definition camera.
The beneficial effects of the present invention are embodied in:
Operation of the present invention is simple, safe and reliable, high-efficient and at low cost, can effectively remove on power transmission line in electrification
Foreign matter, space is had a vast market, suitable for wideling popularize application.
The present invention delivers mechanism using unmanned plane and foreign matter cleaning machine is transferred near foreign matter, in operation, only
Staff's operation on the ground is needed, foreign matter position is positioned by unmanned plane, it is long-range to control the opening and closing of minitype motor driving clip, with
It transmits foreign matter cleaning machine and carries out indirect operating, it is safe and efficient.
Unmanned plane of the invention deliver in mechanism anti-electromagnetic interference masking can anti-electromagnetic interference, to prevent stop-band electricity high-voltage electricity
Route guarantees integrally-built stability to the electromagnetic interference of power supply and machine driving module.
The present invention designs two kinds of band electrical clean-up Work tools of band saw and hook, knot for class and winding two class foreign matter of class is put on a suit of armour
Structure is simple, design is reasonable, easy to carry and at low cost, can safe and reliable, laborsaving, quick processing lead, the foreign matter on ground wire.
The present invention have good scalability, unmanned plane deliver mechanism can transmit indirectly other band electrical clean-up lead, ground wire work
Utensil nearby carries out operation to foreign matter, and plasticity is strong, and use scope is wide.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that unmanned plane delivers mechanism in one embodiment of the invention.
Fig. 2 is the structural schematic diagram of band saw in one embodiment of the invention.
Fig. 3 is enlarged drawing at A.
Fig. 4 is enlarged drawing at B.
Fig. 5 is the left view of Fig. 4.
Fig. 6 is the natural bending suspension schematic diagram of band saw in one embodiment of the invention.
Fig. 7 is the structural schematic diagram of hook in one embodiment of the invention.
The label of each component in attached drawing are as follows: 10 unmanned planes deliver mechanism, 101 unmanned planes, 102 clips, 103 anti-electromagnetic interferences
Shielding casing, 104 power modules, 105 micromotors, 106 drive mechanisms, 107 signal receiving modules, 108 insulated wires, 109 are absolutely
Edge hollow stem, 110 high-definition cameras, 201 saw plates, 2011 sawtooth, 202 connection straps, 203 rivets, 204 becket bridles, 205 shaft insulations
Bar, 206 hooks, 207 annulus, 208 hanging rods, 209 bolts, 30 insulating cords.
Specific embodiment
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.It should be noted that in the feelings not conflicted
Under condition, the features in the embodiments and the embodiments of the present application be can be combined with each other.
Referring to 1 and Fig. 6.
The present invention is based on the route foreign body eliminating apparatus of unmanned plane, including unmanned plane to deliver mechanism 10 and foreign matter removing machine
Structure；
The unmanned plane delivers 102 He of clip that mechanism 10 includes unmanned plane 101 and is arranged on the unmanned plane 101
For controlling the control unit of 102 opening and closing of clip；
The both ends of the foreign matter cleaning machine are connected separately with insulating cord 30.
In use, first opening clip, foreign matter cleaning machine then is clamped with clip, then starts unmanned plane, by nobody
Machine, which carries, to be wound class or puts on a suit of armour at class foreign matter on foreign matter cleaning machine to power transmission line, clip is opened later, by foreign matter cleaning machine
It hangs on power transmission line to be cleaned, finally alternately pulls the insulating cord at foreign matter cleaning machine both ends, such foreign matter cleaning machine is close to
Power transmission line to be cleaned move repeatedly, the foreign matter on power transmission line can be effectively removed.
In one embodiment, the foreign matter cleaning machine is band saw, and referring to fig. 2 and Fig. 6, the band saw is by multiple saw plates
201 are successively hinged and connected composition, and the length direction both ends along the band saw of the saw plate 201 are respectively equipped with sawtooth 2011.This
The band saw of kind of structure, multiple saw plates are linked to be a lot of, and the angle between two neighboring saw plate can be adjusted arbitrarily, and such band saw has
Flexibility can bend naturally and be suspended on power transmission line, can be tightly wound around on power transmission line to be cleaned when sawing back and forth, and saw sword certainly
It so is fitted in power transmission line surface, can effectively cut off the winding class foreign matter such as kite string, setline, without scratching power transmission line, finally
It falls foreign matter naturally, and band saw is in flat elongate strip, guarantees that band saw will not be turned down when moving back and forth on power transmission line.
In one embodiment, the longitudinal section of the saw plate 201 is in hyperboloid of one sheet shape.It designs in this way, the both side plate of saw plate
Face is the curved surface of indent, when band saw is positive and negative to be suspended on power transmission line, can be fitted closely just in power transmission line, and band saw exists
Smooth, raising cutting effect is slided on power transmission line.
In one embodiment, referring to Fig. 5, the cutting edge of the sawtooth 2011 is parallel to the thickness direction of the saw plate 201.This
Sample design, the cutting edge of sawtooth is good to the direction shape of foreign matter, to be further ensured that cutting effect.
In specific implementation, the saw plate 201 is rectangle, and sawtooth 2011 is triangle and close-packed arrays are in the saw plate
The width direction of 201 two long sides, the saw plate 201 is parallel to the length direction of band saw.
It is in one embodiment, hinged by two connection straps 202 between the two neighboring saw plate 201 referring to 4 and Fig. 5,
Two connection straps 202 are located at the width direction two sides of the band saw, and the both ends of the connection strap 202 pass through respectively
Rivet 203 is hinged in the two neighboring saw plate 201.This connection type will not influence being bonded for saw plate and power transmission line, and
And structure is simple, stablizes, and is easy to implement.
In one embodiment, referring to Fig. 3, the insulating cord 30 is connect by electric wire connecting junction with the foreign matter cleaning machine, institute
Electric wire connecting junction is stated to be made of two becket bridles being mutually pivotally connected 204.Outermost saw plate is hinged with hanging rod 208 by two connection straps,
One of becket bridle is hung on the hanging rod, and insulating cord ties up on another becket bridle, two becket bridle energy 360 degree rotations, therefore is being made
During industry, insulating cord will not knot in the sky.In specific implementation, two becket bridles pass through the bolt 209 of two becket bridles by activity
And pivot joint is realized with the nut of bolt cooperation.
In specific implementation, the insulating cord 30 is made of silk.Requirement of mechanical strength can met using silk
Under the conditions of with live wire insulate.
Referring to Fig. 6, when band saw of the invention is suspended on power transmission line, it can bend and be suspended on power transmission line naturally, both ends
Insulating cord hang naturally, can be held respectively by two people, two people's connecting lines perpendicular to conducting wire and keep it is more remote, to make band
The angle sawed at conducting wire is larger, and such band saw is not easy to influence working efficiency because of overturning when moving back and forth, and pulls one end insulation
Then band saw then pulls other end insulating cord then band saw is moved to the other side rope to ipsilateral movement, and sawing is sawed-off by foreign matter back and forth, can
The foreign matters such as the kite, balloon, colored ribbon, the film that wind in grounded-line are removed on ground with operating personnel in the case of realization electrification, are had
Effect solves the negative effect of the security risk and power failure defect elimination of livewire work.
In one embodiment, referring to Fig. 7, the foreign matter cleaning machine is hook.Hook, which can be used to remove, puts on a suit of armour class foreign matter.
The hook of diagram is made of the hook 206 perpendicular to each other being connected on shaft 205 of insulation shaft 205 and four.Shaft insulation
Respectively there is an annulus 207 at the both ends of bar 205, and the insulating cord ties up on corresponding annulus.Hook is pulled up and down by insulating cord, benefit
Plastic foil, felt etc. are caught on hook and puts on a suit of armour class foreign matter, so that realization is led, the accurate of ground wire foreign matter quickly cleans.
In one embodiment, referring to Fig. 1, the bottom of the unmanned plane 101 is equipped with anti-electromagnetic interference shielding casing 103, institute
Stating control unit includes that power module 104, micromotor 105, drive mechanism 106, signal receiving module 107, drum (do not show
Out), insulated wire 108 and insulated hollow bar 109, the upper end of the insulated hollow bar 109 are connected on the shell 103, institute
The lower end that clip 102 is connected to the insulated hollow bar 109 is stated, clip 102 is arranged in the unmanned plane 101 with this
On, the power module 104, micromotor 105, drive mechanism 106, signal receiving module 107 and drum are arranged at institute
It states in shell 103, the power module 104 and signal receiving module 107 are connect with the micromotor 105, the micro electric
Machine 105 is connect by the drive mechanism 106 with the drum, and the insulated wire 108 is wound around on the drum, the insulation
The free end of line 108 passes through the insulated hollow bar 109 and connect with the clip 102.
In use, signal receiving module receives positive (reversed) rotation of control micromotor after control signal, then pass through
Drive mechanism drives positive (reversed) rotation of drum, to make insulated wire (downward) movement upwards, realizes that control clip opening (is closed
Close) function, and anti-electromagnetic interference masking then can avoid signal interference, drive mechanism can be intermeshing driving gear and
Driven gear, driving gear and driven gear are connect with micromotor and drum respectively.The clip can be selected existing common
By drawstring control folding clip.
In one embodiment, the unmanned plane 101 is equipped with high-definition camera 110.It can clearly observe defeated
Environment around electric wire quickly positions foreign matter position, realizes accurately remotely controlled operation.Unmanned plane can be selected quadrotor nobody
Machine.
It should be understood that example as described herein and embodiment are not intended to restrict the invention, this field only for explanation
Technical staff can make various modifications or variation according to it, all within the spirits and principles of the present invention, made any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of route foreign body eliminating apparatus based on unmanned plane, it is characterised in that: including unmanned plane deliver mechanism (10) and
Foreign matter cleaning machine；
The unmanned plane delivers the clip that mechanism (10) include unmanned plane (101) and are arranged on the unmanned plane (101)
(102) and the control unit for controlling the clip (102) opening and closing；
The foreign matter cleaning machine is band saw, and the band saw is successively hinged and connected by multiple saw plates (201) and is constituted, the saw plate
(201) the length direction both ends along the band saw are respectively equipped with sawtooth (2011), the both ends difference of the foreign matter cleaning machine
It is connected with insulating cord (30).
2. the route foreign body eliminating apparatus based on unmanned plane as described in claim 1, it is characterised in that: the sawtooth (2011)
Cutting edge be parallel to the thickness directions of the saw plate (201).
3. the route foreign body eliminating apparatus based on unmanned plane as claimed in claim 1 or 2, it is characterised in that: two neighboring institute
It states and passes through two connection straps (202) hingedly between saw plate (201), two connection straps (202) are located at the band saw
Width direction two sides, and the both ends of the connection strap (202) pass through rivet (203) respectively and are hinged on the two neighboring saw plate
(201) on.
4. the route foreign body eliminating apparatus based on unmanned plane as claimed in claim 1 or 2, it is characterised in that: the insulating cord
(30) it is connect by electric wire connecting junction with the foreign matter cleaning machine, the electric wire connecting junction is made of two becket bridles being mutually pivotally connected (204).
5. the route foreign body eliminating apparatus based on unmanned plane as described in claim 1, it is characterised in that: the unmanned plane
(101) bottom is equipped with anti-electromagnetic interference shielding casing (103), and described control unit includes power module (104), micromotor
(105), drive mechanism (106), signal receiving module (107), drum, insulated wire (108) and insulated hollow bar (109), institute
The upper end for stating insulated hollow bar (109) is connected on the shell (103), and the clip (102) is connected to the insulated hollow
Clip (102) are arranged on the unmanned plane (101) with this for the lower end of bar (109), the power module (104), micro-
Type motor (105), drive mechanism (106), signal receiving module (107) and drum are arranged in the shell (103), institute
It states power module (104) and the signal receiving module (107) is connect with the micromotor (105), the micromotor
(105) it is connect by the drive mechanism (106) with the drum, the insulated wire (108) is wound around on the drum, described
The free end of insulated wire (108) passes through the insulated hollow bar (109) and connect with the clip (102).
6. the route foreign body eliminating apparatus as claimed in claim 1 or 5 based on unmanned plane, it is characterised in that: the unmanned plane
(101) high-definition camera (110) are equipped with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710642780.3A CN107230946B (en) | 2017-07-31 | 2017-07-31 | A kind of route foreign body eliminating apparatus based on unmanned plane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710642780.3A CN107230946B (en) | 2017-07-31 | 2017-07-31 | A kind of route foreign body eliminating apparatus based on unmanned plane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107230946A CN107230946A (en) | 2017-10-03 |
| CN107230946B true CN107230946B (en) | 2019-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710642780.3A Active CN107230946B (en) | 2017-07-31 | 2017-07-31 | A kind of route foreign body eliminating apparatus based on unmanned plane |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108390315A (en) * | 2018-04-28 | 2018-08-10 | 广东电网有限责任公司 | A kind of overhead transmission line, which floats, hangs object cleaning plant |
| CN109038368A (en) * | 2018-08-24 | 2018-12-18 | 国网河北省电力有限公司沧州供电分公司 | Eminence charges unmanned plane of getting rid of the danger |
| CN109987225A (en) * | 2019-04-03 | 2019-07-09 | 阙文新 | A kind of air rescue device and rescue mode |
| CN110884661A (en) * | 2019-12-06 | 2020-03-17 | 湖南浩天翼航空技术有限公司 | Transportation unmanned aerial vehicle convenient to press from both sides express delivery and get |
| CN113875423B (en) * | 2021-10-27 | 2022-08-09 | 国网山东省电力公司武城县供电公司 | Cutting device and method for cutting plants invading into crossed power transmission lines |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19950405C2 (en) * | 1999-10-20 | 2001-11-22 | Ecms Aviat Systems Gmbh | Device for attaching a load to a helicopter |
| CN202749749U (en) * | 2012-08-21 | 2013-02-20 | 谢诤让 | Foreign-matter cleaning belt for power transmission line |
| CN205304089U (en) * | 2015-12-10 | 2016-06-08 | 国家电网公司 | Barrier device is removed to unmanned aerial vehicle swa blade cutting formula |
| CN205377181U (en) * | 2016-02-25 | 2016-07-06 | 温州博远工业设计有限公司 | Operating rod |
| CN205921294U (en) * | 2016-06-02 | 2017-02-01 | 国网山东省电力公司胶州市供电公司 | A aircraft device for clearance of power transmission line foreign matter |
| CN206117002U (en) * | 2016-09-12 | 2017-04-19 | 国网浙江苍南县供电有限责任公司 | Power line foreign matter duster |
| CN206349689U (en) * | 2016-12-08 | 2017-07-21 | 北京国网富达科技发展有限责任公司 | Line of fall apparatus for work for double-end pulley |
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2017
- 2017-07-31 CN CN201710642780.3A patent/CN107230946B/en active Active
Also Published As
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| CN107230946A (en) | 2017-10-03 |
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