CN118515216B - Auxiliary lifting device for tunnel cable maintenance - Google Patents
Auxiliary lifting device for tunnel cable maintenance Download PDFInfo
- Publication number
- CN118515216B CN118515216B CN202410985116.9A CN202410985116A CN118515216B CN 118515216 B CN118515216 B CN 118515216B CN 202410985116 A CN202410985116 A CN 202410985116A CN 118515216 B CN118515216 B CN 118515216B
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- Prior art keywords
- cable
- lifting
- bracket
- bevel gear
- arc
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/28—Constructional details, e.g. end stops, pivoting supporting members, sliding runners adjustable to load dimensions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/02—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars
- B66F7/025—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars screw operated
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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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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Carriers, Traveling Bodies, And Overhead Traveling Cranes (AREA)
Abstract
The invention belongs to the technical field of tunnel cable overhaul, in particular to an auxiliary lifting device for tunnel cable overhaul, which aims at solving the problem that cables are not effectively wrapped when an existing supporting plate is lifted in an auxiliary mode. According to the invention, the mounting plate is moved to the outer side of the circumference of the cable through the lifting assembly, the hydraulic column is extended to enable the bracket to rotate until the bracket is perpendicular to the mounting plate, in the rotating process of the bracket, the electric push rod is extended to enable the fixed table to move and be attached to the outer side of the circumference of the cable, the driving motor work conveying assembly and the transmission mechanism are started, and then the movable table is enabled to move at a constant speed in the arc-shaped groove and the arc-shaped opening of the fixed table until the other side of the circumference of the cable is wrapped, and when the bracket is rotated to be perpendicular to the mounting plate, the purpose of lifting the cable is achieved.
Description
Technical Field
The invention relates to the technical field of tunnel cable overhaul, in particular to an auxiliary lifting device for tunnel cable overhaul.
Background
After the tunnel cable is put into operation for a long time, accidents such as damage of an outer insulating layer of the cable, breakdown of the outer insulating layer, falling of the cable, and the like are frequently found in overhaul, and only unplanned power failure overhaul can be performed, so that the power supply reliability is greatly reduced, the power supply service quality is reduced, and the economic benefits of enterprises are influenced. The cable is lifted from the bridge to be convenient to examine and repair, and especially the lifting maintenance of the cable and the upper cable in the bridge is extremely difficult in cable maintenance, and the lifting appliance cannot be placed because the lifting supporting point is not arranged at the lower part of the cable, so that the auxiliary lifting device is provided to help the maintenance of the tunnel cable.
Through retrieving, patent publication number CN106744567B discloses the title be a lifting device of maintenance tunnel cable, the technical problem that its needs to solve is that the cable lifting need set up the jack-up tripod, use hoist lifting cable, the maintainer squats and lies in cable downside work, the malignant injury accident that the field was striden in the slope of tripod fulcrum probably takes place, simultaneously also bring a great deal of difficulty for the cable later maintenance, through setting up the channel-section steel support subaerial with the cable, install the fridge with channel-section steel support swing joint below the cable, fixed horizontal jack in the fridge, the change of position of hanging axle through the transposition hole makes the angle of fridge and channel-section steel frame plate change, remove the roll adjustment board and can carry out the angle fine setting, make horizontal jack can lift the cable above from different angles. The channel steel supports are in up-down butt joint, so that the horizontal jack can lift cables with different layers. The invention has simple structure, rapid assembly and convenient maintenance of the cable by moving in the tunnel, can reduce the labor intensity, ensure the construction safety and improve the labor efficiency.
There are still the following drawbacks to be solved: the cable is not effectively wrapped when the supporting plate is lifted in an auxiliary mode, and the cable is easy to shake, unstable and abrade.
Disclosure of Invention
Based on the technical problem that the cable is not effectively wrapped when the existing supporting plate is lifted in an auxiliary mode, the invention provides an auxiliary lifting device for overhauling a tunnel cable.
The invention provides an auxiliary lifting device for overhauling a tunnel cable, which comprises a movable chassis, wherein a supporting column is fixedly arranged at the top end of the movable chassis, a lifting assembly is fixedly arranged at the top end of the supporting column, a lifting plate is arranged in the lifting assembly, a mounting plate is fixedly arranged on one side of the lifting plate, a bracket is rotatably arranged at the upper end of one side of the mounting plate, a hydraulic column is rotatably arranged between the bottom end of the mounting plate and one side of the bottom end of the bracket, an electric push rod is fixedly arranged in the middle of the other side of the bracket, limiting sliding grooves are formed in the two ends of the top end of the bracket, a fixed table is slidably arranged at the top end of the two limiting sliding grooves, an arc-shaped opening is formed in the top end of the fixed table, a movable table is slidably arranged between the arc-shaped opening and the arc-shaped opening, a plurality of equidistant tooth grooves are formed in the middle of the outer wall of the other side of the movable table, a driving motor is fixedly arranged at one end of the fixed table, a conveying assembly is arranged in the storage groove, a transmission mechanism is arranged between the output end of the driving motor and the conveying assembly, reversing guide rails are rotatably arranged at the two sides of the tail end of the movable table, and a reversing guide rail is slidably arranged between the two reversing guide rails.
Preferably, the through hole is arranged at the upper end of the circumference of the support column, a threaded cylinder is fixedly arranged in the through hole, an adjusting rod is rotatably arranged in the threaded cylinder, and a handle is fixedly connected to the outer side of the adjusting rod.
Preferably, the lifting assembly comprises a bottom support and a top support, a lifting motor is fixedly arranged in the middle of the top end of the top support, a threaded rod is fixedly arranged at the output end of the lifting motor, the middle of the lifting plate is rotatably sleeved with the threaded rod, guide rods are fixedly arranged at four corners of the opposite ends of the bottom support and the top support, and the four guide rods are slidably sleeved with the lifting plate.
Preferably, the upper end and the lower end of the outer wall of the other side of the mounting plate and the top end and the bottom end of the lifting plate are fixedly provided with triangular reinforcing blocks, the outer wall of the other side of the bracket is fixedly provided with a switching block, and two sides of the switching block are rotationally connected with two ends of the upper end of the mounting plate.
Preferably, the movable tail end of the electric push rod is fixedly connected with the outer wall of the fixed table, and sliding blocks are fixedly arranged at two ends of the bottom end of the fixed table.
Preferably, the conveying assembly comprises a plurality of rotating shafts with equal angles, the outer sides of the rotating shafts are fixedly sleeved with driving rollers, one ends of the rotating shafts penetrate through the storage grooves and extend to the outer sides of the fixed tables, one ends of the rotating shafts are fixedly sleeved with driving gears, and a plurality of the driving gears are sleeved with conveying belts.
Preferably, the transmission mechanism comprises a driving bevel gear and a driven bevel gear, the driving bevel gear is fixedly arranged at the output end of the driving motor, the driven bevel gear is fixedly arranged at the tail end of one of the rotating shafts, the driven bevel gear is positioned at the outer side of the transmission gear, and the driven bevel gear is meshed with the driving bevel gear.
Preferably, the driving roller is meshed with a plurality of tooth grooves.
Preferably, the wall-attaching assembly comprises a sliding frame, one side of the sliding frame is rotatably sleeved with a guide roller, the other side of the sliding frame is fixedly provided with a plurality of equidistant elastic rods, and the tail ends of the elastic rods are fixedly provided with air bag strips.
Preferably, the other side outer walls of the fixed platform and the movable platform are provided with slip-aid coatings.
The beneficial effects of the invention are as follows:
1. The auxiliary lifting device for tunnel cable maintenance provided by the invention is characterized in that a worker moves the auxiliary lifting device to the inside of a tunnel and approaches the cable, a lifting assembly moves a mounting plate to the outer side of the circumference of the cable, a hydraulic column stretches to enable a bracket to rotate until the bracket is vertical to the mounting plate, in the rotating process of the bracket, an electric push rod stretches to enable a fixed table to move and be attached to the outer side of the circumference of the cable, a driving motor works and a transmission assembly and a transmission mechanism are started, a movable table is enabled to move at a constant speed in an arc-shaped groove and an arc-shaped opening of the fixed table until the other side of the circumference of the cable is wrapped, when the bracket rotates to the mounting plate to be vertical, the purpose of lifting the cable is achieved, and the hydraulic column is enabled to stretch continuously or the lifting assembly is enabled to work continuously according to the requirement of a maintenance site to enable the mounting plate to be lifted, and then better maintenance work of carrying out tunnel cable reaches the effect to the stable lifting of cable, and paste the wall subassembly and include the balladeur train, the deflector roll, a plurality of equidistant elastic rod and balloon strip, when the mobile station removes at the arc wall and the arc opening of fixed station, the deflector roll is hugged closely tunnel wall under the effect of balloon strip and a plurality of elastic rod, the balladeur train and along with the promotion of mobile station slide inside the switching-over guide rail, even make the switching-over guide rail take to paste the wall subassembly to rotate the back again laminating tunnel wall, make the stable lifting cable of mobile station, and the opposite side outer wall of fixed station and mobile station all is provided with the helping smooth coating, help the fixed station to the location of cable and mobile station along cable circumference removal and not wearing and tearing.
2. According to the auxiliary lifting device for tunnel cable maintenance, the driving bevel gear drives the driven bevel gear to rotate through the driving motor, so that the rotating shaft where the driven bevel gear is located is driven to rotate, the transmission belt is sleeved with the transmission gears, the transmission rollers are meshed with the tooth grooves, so that the rotation of the rotating shafts is driven, and the effect that the transmission rollers rotate to convey the moving platform to move is achieved.
Drawings
Fig. 1 is a schematic structural diagram of an auxiliary lifting device for overhauling a tunnel cable;
fig. 2 is a schematic right-side view structure of an auxiliary lifting device for overhauling a tunnel cable;
Fig. 3 is a schematic structural view of an auxiliary lifting device bracket for tunnel cable maintenance, which is provided by the invention;
fig. 4 is a schematic left-view structural diagram of an auxiliary lifting device fixing table for tunnel cable maintenance, which is provided by the invention;
fig. 5 is a schematic diagram of a right-side view structure of a fixing table of an auxiliary lifting device for overhauling a tunnel cable;
Fig. 6 is a schematic bottom view of a driving roller of an auxiliary lifting device for tunnel cable maintenance according to the present invention;
fig. 7 is a schematic diagram of a right-side view structure of a mobile station of an auxiliary lifting device for overhauling a tunnel cable.
In the figure: 1a mobile chassis, 2a support column, 3a thread cylinder, 4 an adjusting rod, 5 a handle, 6a bottom support, 7a top support, 8 a guide rod, 9 a lifting motor, 10a threaded rod, 11 a lifting plate, 12 a mounting plate, 13 a bracket, 14 a hydraulic column, 15 a fixed table, 16 a mobile table, 17 a sliding block, 18 a limit chute, 19 a triangular reinforcing block, 20 a switching block, 21 an electric push rod, 22a driving motor, 23 a driving bevel gear, 24 a driven bevel gear, 25 a transmission gear, 26 a conveyor belt, 27 a storage groove, 28 a curved groove, 29 a curved opening, 30 a transmission roller, 31 a reversing guide rail, 32 a sliding frame, 33 a guide roller, 34 an elastic rod, 35 an air bag strip, 36 a tooth groove and 37 a rotating shaft.
Detailed Description
Referring to fig. 1-7, a tunnel cable overhauls with supplementary lifting device, including removing chassis 1, remove chassis 1 top fixed mounting and have support column 2, and support column 2 top fixed be provided with lifting unit, lifting unit inside is provided with lifter plate 11, and lifter plate 11 one side fixed mounting has mounting panel 12, mounting panel 12 one side upper end rotates and installs bracket 13, and rotate between mounting panel 12 bottom and bracket 13 bottom one side and install hydraulic ram 14, fixed mounting has electric putter 21 in the middle of the bracket 13 opposite side, spacing spout 18 has been seted up at bracket 13 top both ends, and two spacing spout 18 top slidable mounting have fixed station 15, fixed station 15 one side outer wall is the arc, the inside storage tank 27 that has been seted up of fixed station 15, and storage tank 27 top has been seted up arc groove 28, arc opening 29 has been seted up at arc groove 28 top, slidable mounting has movable station 16 between arc groove 28 and the arc opening 29, and set up a plurality of equidistant 36 in the middle of the outer wall of movable station 16 opposite side, fixed station 15 one end fixed mounting has driving motor 22, storage tank 27 inside is provided with the conveying assembly, and be provided with drive motor 22 output and conveying mechanism between the conveying assembly, change-over guide rail 31 is installed to two sides between the rotary guide rail assembly, change-over guide rail 31 is set up.
According to the invention, the upper end of the circumference of the support column 2 is provided with a through hole, the inside of the through hole is fixedly provided with a threaded cylinder 3, the inside of the threaded cylinder 3 is rotatably provided with an adjusting rod 4, the outer side of the adjusting rod 4 is fixedly connected with a handle 5, the adjusting rod 4 is rotated in the threaded cylinder 3 by rotating the handle 5, so that the distance between the handle 5 and the support column 2 is adjusted, and a worker can conveniently move the auxiliary lifting device;
The lifting assembly comprises a bottom support 6 and a top support 7, a lifting motor 9 is fixedly arranged in the middle of the top end of the top support 7, a threaded rod 10 is fixedly arranged at the output end of the lifting motor 9, the middle of the lifting plate 11 is rotatably sleeved with the threaded rod 10, guide rods 8 are fixedly arranged at four corners of opposite ends of the bottom support 6 and the top support 7, the four guide rods 8 are slidably sleeved with the lifting plate 11, the threaded rod 10 is rotated through the working of the lifting motor 9, the lifting plate 11 can be further moved upwards or downwards, the four guide rods 8 are slidably sleeved with the lifting plate 11, the stability of the lifting plate 11 in the upward or downwards movement is greatly improved, and further, the stability of the mounting plate 11, the bracket 13 and the fixing table 15 is ensured;
Triangular reinforcing blocks 19 are fixedly arranged at the upper end and the lower end of the outer wall of the other side of the mounting plate 12 and at the top end and the bottom end of the lifting plate 11, a switching block 20 is fixedly arranged at the outer wall of the other side of the bracket 13, and two sides of the switching block 20 are rotatably connected with two ends of the upper end of the mounting plate 12;
The movable tail end of the electric push rod 21 is fixedly connected with the outer wall of the fixed table 15, and sliding blocks 17 are fixedly arranged at the two ends of the bottom end of the fixed table 15, so that the fixed table 15 can stably slide in the two limiting sliding grooves 18 of the bracket 13 when the electric push rod 21 stretches or shortens;
The conveying assembly comprises a plurality of rotating shafts 37 with equal angles, the outer sides of the rotating shafts 37 are fixedly sleeved with driving rollers 30, one ends of the rotating shafts 37 penetrate through the containing grooves 27 and extend to the outer sides of the fixed tables 15, one ends of the rotating shafts 37 are fixedly sleeved with driving gears 25, and the outer sides of the plurality of driving gears 25 are sleeved with conveying belts 26;
The driving bevel gear 23 and the driven bevel gear 24 are arranged fixedly at the output end of the driving bevel gear 23 and the driving motor 22, the driven bevel gear 24 is fixedly arranged at the tail end of one rotating shaft 37, the driven bevel gear 24 is positioned at the outer side of the driving gear 25, the driven bevel gear 24 is meshed with the driving bevel gear 23, the driving bevel gear 23 drives the driven bevel gear 24 to rotate through the driving motor 22, the rotating shaft 37 where the driven bevel gear 24 is positioned is driven to rotate, the driving roller 30 is sleeved with the plurality of driving gears 25 through the conveying belt 26, the plurality of tooth grooves 36 are meshed with each other, and the plurality of rotating shafts 37 are driven to rotate, so that the effect that the plurality of driving rollers 30 rotate to convey the movement of the mobile station 16 is achieved;
The driving roller 30 is meshed with a plurality of tooth grooves 36;
The wall attaching assembly comprises a sliding frame 32, a guide roller 33 is rotatably sleeved on one side of the sliding frame 32, a plurality of equidistant elastic rods 34 are fixedly arranged on the other side of the sliding frame 32, an air bag strip 35 is fixedly arranged at the tail ends of the elastic rods 34, when the movable table 16 moves in the arc-shaped groove 28 and the arc-shaped opening 29 of the fixed table 15, the guide roller 33 is tightly attached to a tunnel wall under the action of the air bag strip 35 and the elastic rods 34, the sliding frame 32 slides in the reversing guide rail 31 along with the pushing of the movable table 16, and even the reversing guide rail 31 is attached to the tunnel wall after being rotated and reversed along with the wall attaching assembly, so that the movable table 16 stably lifts a cable;
The other side outer walls of the stationary 15 and mobile 16 stations are each provided with a slip-promoting coating to facilitate the positioning of the cable by the stationary 15 station and the movement of the mobile 16 station along the circumference of the cable without wear.
Working principle: the staff moves the auxiliary lifting device to the inside of the tunnel and approaches the cable, the mounting plate 12 is moved to the outer side of the circumference of the cable through the lifting component, the hydraulic column 14 stretches to enable the bracket 13 to rotate until the bracket is perpendicular to the mounting plate 12, in the rotating process of the bracket 13, the electric push rod 21 stretches to enable the fixed table 15 to move and attach to the outer side of the circumference of the cable, the driving motor 22 works and starts the conveying component and the transmission mechanism, the movable table 16 further moves at a uniform speed in the arc-shaped groove 28 and the arc-shaped opening 29 of the fixed table 15 until the other side of the circumference of the cable is wrapped, when the bracket 13 rotates to the vertical side of the mounting plate 12, the purpose of lifting the cable is achieved, the hydraulic column 14 continues to stretch or the lifting component continues to work according to the requirement of an overhaul site to enable the mounting plate 12 to be lifted, the maintenance work of the tunnel cable is better carried out, the effect of stably lifting the cable is achieved, the wall attaching assembly comprises a sliding frame 32, a guide roller 33, a plurality of equidistant elastic rods 34 and an air bag strip 35, when the movable table 16 moves in the arc-shaped groove 28 and the arc-shaped opening 29 of the fixed table 15, the guide roller 33 is tightly attached to the tunnel wall under the action of the air bag strip 35 and the elastic rods 34, the sliding frame 32 slides in the reversing guide rail 31 along with the pushing of the movable table 16, even the reversing guide rail 31 is enabled to be attached to the tunnel wall after being rotated and changed along with the wall attaching assembly, the movable table 16 stably lifts the cable, and the sliding-assisting coatings are arranged on the outer walls of the other sides of the fixed table 15 and the movable table 16, so that the fixed table 15 is beneficial to the positioning of the cable and the movable table 16 moves along the circumference of the cable without abrasion;
The driving bevel gear 23 drives the driven bevel gear 24 to rotate through the operation of the driving motor 22, so as to drive the rotation shaft 37 where the driven bevel gear 24 is positioned to rotate, the transmission belt 26 is sleeved with the plurality of transmission gears 25, the transmission roller 30 is meshed with the plurality of tooth grooves 36, so that the plurality of rotation shafts 37 are driven to rotate, and the effect that the plurality of transmission rollers 30 rotate to transmit the movement of the mobile station 16 is achieved.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410985116.9A CN118515216B (en) | 2024-07-23 | 2024-07-23 | Auxiliary lifting device for tunnel cable maintenance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410985116.9A CN118515216B (en) | 2024-07-23 | 2024-07-23 | Auxiliary lifting device for tunnel cable maintenance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN118515216A CN118515216A (en) | 2024-08-20 |
| CN118515216B true CN118515216B (en) | 2024-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410985116.9A Active CN118515216B (en) | 2024-07-23 | 2024-07-23 | Auxiliary lifting device for tunnel cable maintenance |
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| Country | Link |
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| CN (1) | CN118515216B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119774493B (en) * | 2024-11-06 | 2025-11-25 | 国网河南淅川县供电公司 | An auxiliary lifting device for tunnel cable maintenance |
Citations (2)
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|---|---|---|---|---|
| CN106744567A (en) * | 2016-11-30 | 2017-05-31 | 国家电网公司 | A kind of lifting apparatus for overhauling tunnel cable |
| CN109980572A (en) * | 2019-03-19 | 2019-07-05 | 江苏利宏原电力科技有限公司 | A kind of power grid fall to power protective device and installation and application |
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| KR100191639B1 (en) * | 1995-08-26 | 1999-06-15 | 이계철 | Bolted cable lifter |
| JP4337982B2 (en) * | 2004-12-06 | 2009-09-30 | 中国電力株式会社 | Cable support and adapter for cable support |
| US10167179B2 (en) * | 2015-10-23 | 2019-01-01 | Kurtjan Jacks (Pty) Ltd. | Jack system |
| CN109573893B (en) * | 2018-12-12 | 2024-06-04 | 贵州电网有限责任公司 | Cable trench cover prying and transporting integrated device |
| DE202020105104U1 (en) * | 2020-09-04 | 2020-10-08 | China Railway Liuyuan Group Co., Ltd. | Protective bracket with a mesh profile structure for underground tunnel construction |
| CN112448307B (en) * | 2020-11-17 | 2022-04-08 | 国网山东省电力公司济南市历城区供电公司 | Cable trench cover board sled fortune device |
| CN113309459A (en) * | 2021-06-21 | 2021-08-27 | 国网湖北省电力有限公司鄂州供电公司 | Ladder is hung in maintenance of electric power construction usefulness |
| CN114256800A (en) * | 2021-12-24 | 2022-03-29 | 武汉誉城千里建工有限公司 | Cable supporting device suitable for trenchless power tunnel and construction method |
| CN115513835A (en) * | 2022-11-02 | 2022-12-23 | 国家电网有限公司 | Electric power overhauls and lifts device with cable |
| CN116621075A (en) * | 2023-05-11 | 2023-08-22 | 冯艳丽 | Electric power overhaul equipment convenient to install and use method thereof |
| CN220520032U (en) * | 2023-05-12 | 2024-02-23 | 四川电力医院 | Auxiliary device for high-altitude power operation |
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2024
- 2024-07-23 CN CN202410985116.9A patent/CN118515216B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106744567A (en) * | 2016-11-30 | 2017-05-31 | 国家电网公司 | A kind of lifting apparatus for overhauling tunnel cable |
| CN109980572A (en) * | 2019-03-19 | 2019-07-05 | 江苏利宏原电力科技有限公司 | A kind of power grid fall to power protective device and installation and application |
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| CN118515216A (en) | 2024-08-20 |
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