CN110829339B - Ground cable conveying protection device and cable construction conveying structure - Google Patents
Ground cable conveying protection device and cable construction conveying structure Download PDFInfo
- Publication number
- CN110829339B CN110829339B CN201911228312.7A CN201911228312A CN110829339B CN 110829339 B CN110829339 B CN 110829339B CN 201911228312 A CN201911228312 A CN 201911228312A CN 110829339 B CN110829339 B CN 110829339B
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- 238000010276 construction Methods 0.000 title claims abstract description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 27
- 238000009434 installation Methods 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000008439 repair process Effects 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 2
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000004804 winding Methods 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
- H02G9/00—Installations of electric cables or lines in or on the ground or water
- H02G9/04—Installations of electric cables or lines in or on the ground or water in surface ducts; Ducts or covers therefor
Landscapes
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The invention relates to a ground cable conveying protection device and a cable construction conveying structure, which comprise a protection main board, wherein the two sides of the protection main board are a left bottom section and a right bottom section, the inner sides of the left bottom section and the right bottom section are respectively connected with a left slope section and a right slope section, a cable groove protection section is arranged between the left slope section and the right slope section, and a cable placing groove is arranged below the cable groove protection section. Compared with the traditional cable protection device, the invention can be suitable for laying the cable pavement with the highest voltage level of 220 kilovolts; through the two slope sections, the traffic of pedestrians and vehicles on the road surface can be satisfied; the cable placing groove adopts an insulating rubber pad, so that reliable compression-resistant protection is provided for the cable in the groove, a closed magnetic circuit is not formed, and the single-core cable can be directly placed in the groove; the cable placing groove is designed with an upward opening, so that the protection device is fixed on the road surface, and then the cable is directly placed in the groove.
Description
Technical Field
The invention belongs to the technical field of electric power rush-repair equipment, and relates to a ground cable conveying protection device.
Background
In the power cable repair process, the situation that the cable cannot be repaired and laid in time due to the loss of a channel may exist. The rapid repair technology of the power cable effectively solves the problem, adopts a ground laying mode to temporarily isolate a fault section and recover power supply, and provides time for repairing a channel. When the cable is laid on the ground, passers-by and vehicle passing safety can be influenced. The ground cable conveying protection device can be used for fixing and protecting the ground cable and a road surface passing slope channel. The conventional protection device can only be applied to a non-motor vehicle road surface, and cannot provide effective and reliable protection for a power cable.
Disclosure of Invention
The invention aims to provide a ground cable conveying protection device which can effectively fix and protect ground laid power cables and solve the problem that the ground cables influence road traffic.
According to the technical scheme provided by the invention: the utility model provides a protection device is carried to ground cable, includes the protection mainboard, the protection mainboard both sides are left end section and right end section, left end section with left slope section and right slope section are connected respectively to the inboard of right end section, left side slope section with be the cable duct protection section between the right slope section, cable duct protection section below sets up the cable standing groove, the inboard insulating rubber of cable standing groove, left end section with right end section both sides all set up ground connecting plate, it has the connecting hole to open on the ground connecting plate.
As a further improvement of the invention, a left support plate and a right support plate are arranged below the left slope section and the right slope section.
As a further improvement of the invention, the lower end of the cable trough protection section is attached to the reinforcing transverse plate.
As a further improvement of the invention, the protective main board is a checkered board.
The cable construction conveying structure comprises any ground cable conveying protection device, wherein one side of the ground cable conveying protection device is provided with a quick rush repair cable device; the quick rush-repair cable device comprises a motor side support and a support, wherein any cable drum is arranged between the upper portion of the motor side support and the upper portion of the support in a rotating mode, a speed reducer is installed on the motor side support, the input end of the speed reducer is connected with a motor, the output end of the speed reducer is connected with a driving sprocket, one end of the cable drum is provided with a driven sprocket, and the driving sprocket is connected with the driven sprocket through a transmission chain.
As a further improvement of the invention, the motor side bracket comprises a mounting main board and a speed reducer plate, wherein an operation bracket is vertically mounted on the left side of the upper part of the mounting main board, an upper movable ring is hinged in the upper part of the mounting operation bracket, a screw rod is connected with the middle thread of the upper movable ring, and a lower movable ring clamping plate is arranged in the middle of the screw rod; the lower movable ream clamping plate comprises a lower movable ream connecting plate, a lower movable ream is hinged in the lower movable ream connecting plate, a hinged support is vertically arranged on the right side of the upper portion of the installation main board, a right connecting plate is hinged in the hinged support, the left end of the speed reducer plate is fixedly connected with the lower movable ream connecting plate, the right end of the speed reducer plate is fixedly connected with the right connecting plate, and the speed reducer is installed on the speed reducer plate.
As a further improvement of the invention, a cable arranging device is arranged between the lower part of the motor side bracket and the lower part of the bracket; the cable arranging device comprises a cable arranging device sliding rod, two ends of the cable arranging device sliding rod are respectively connected with the lower part of the motor side bracket and the lower part of the bracket, a cable arranging device sliding block is connected in the cable arranging device sliding rod in a sliding manner, and a cable placing structure is arranged on the cable arranging device sliding block; the cable placing structure comprises a cable lower baffle rod, the cable lower baffle rod is rotatably mounted on the cable arranging device sliding block, and a cable left vertical baffle rod and a cable right vertical baffle rod are respectively rotatably arranged on two sides of the cable lower baffle rod.
As a further improvement of the invention, cable drum rotation installation parts are arranged in the motor side bracket and the bracket, the cable drum rotation installation parts comprise a left vertical rod and a right vertical rod, a roller block is arranged between the left vertical rod and the right vertical rod, a semicircular rotation installation roller is arranged in the roller block, and the upper ends of the left vertical rod and the right vertical rod are in threaded connection with a cable drum baffle; the cable drum end is located the gyro wheel upper end.
As a further improvement of the invention, a hand wheel is arranged at the upper end of the screw rod.
The invention can provide the fixation and protection of ground laying power cables and realize road traffic. Compared with the traditional cable protection device, the invention can be suitable for laying the cable pavement with the highest voltage level of 220 kilovolts; through the two slope sections, the traffic of pedestrians and vehicles on the road surface can be satisfied; the cable placing groove adopts an insulating rubber pad, so that reliable compression-resistant protection is provided for the cable in the groove, a closed magnetic circuit is not formed, and the single-core cable can be directly placed in the groove; the cable placing groove is designed with an upward opening, so that the protection device is fixed on the road surface, and then the cable is directly placed in the groove.
Drawings
Fig. 1 is a schematic structural diagram of a quick rush-repair cable device of the present invention.
Fig. 2 is a side view of fig. 1.
Fig. 3 is a schematic structural view of the cable drum of the present invention.
Fig. 4 is a schematic structural view of a motor side bracket according to the present invention.
Fig. 5 is a schematic structural view of the cable arranging device of the present invention.
Fig. 6 is a schematic structural view of a cable drum rotation mounting portion of the present invention.
Fig. 7 is a schematic structural view of the ground cable transportation protection device of the present invention.
Fig. 8 is a top view of fig. 7.
Fig. 9 is a schematic view of the cable placing groove of the present invention.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings.
In the fig. 1-9, the cable drum 1, the cable placing groove 1-1, the spacer ring 1-2, the cable 2, the driven sprocket 3, the motor side bracket 4, the installation main board 4-1, the operation bracket 4-2, the screw rod 4-3, the hand wheel 4-4, the upper movable joint 4-5, the speed reducer plate 4-6, the hinged bracket 4-7, the lower movable joint 4-8, the right joint 4-9, the driving sprocket 5, the speed reducer 6, the frequency converter control box 7, the bracket 8, the transmission chain 9, the quick connector 10, the cable drum 12, the cable drum slide bar 12-1, the cable drum slide block 12-2, the cable lower baffle bar 12-3, the cable left vertical baffle bar 12-4, the cable right vertical baffle bar 12-5, the left vertical bar 13-1, the right vertical bar 13-2, the roller block 13-3, the roller 13-4, the cable drum baffle 13-5, the ground cable conveying protection device 14, the protection main board 14-1, the cable placing groove 14-2, the insulating rubber 14-3, the ground joint 14-4, the right support plate 14-5, the left support plate 14-6, the bottom support plate 14-14, the right support plate 14-14, the right slope section 14-14, the slope section and the like.
As shown in fig. 7-9, the invention relates to a ground cable conveying protection device 14, which comprises a protection main board 14-1, wherein a left bottom section 14-11 and a right bottom section 14-12 are arranged on two sides of the protection main board 14-1, the inner sides of the left bottom section 14-11 and the right bottom section 14-12 are respectively connected with a left slope section 14-13 and a right slope section 14-14, a cable groove protection section 14-15 is arranged between the left slope section 14-13 and the right slope section 14-14, a cable placing groove 14-2 is arranged below the cable groove protection section 14-15, and 4mm insulating rubber 14-3 is adhered on the inner sides of the cable placing grooves 14-2.
The ground connection plates 14-4 are arranged on both sides of the left bottom section 14-11 and the right bottom section 14-12. The ground connection plate 14-4 is provided with a connection through hole, and the device can be connected with the ground through a connection piece.
The left support plate 14-5 and the right support plate 14-6 are arranged below the left slope section 14-13 and the right slope section 14-14 and are used for supporting and stabilizing the left slope section 14-13 and the right slope section 14-14.
The lower ends of the cable duct protection sections 14-15 are attached to the reinforcing transverse plates 14-16, so that the dent resistance of the cable duct protection sections 14-15 is enhanced.
The left slope section 14-13 and the right slope section 14-14 are inclined, the lower ends of the left slope section 14-13 and the right slope section 14-14 are respectively connected with the left bottom section 14-11 and the right bottom section 14-12, the cable groove protection section 14-15 is arranged between the high ends of the left slope section and the right slope section,
In this embodiment, the protection main board 14-1 is a checkered plate, and has high friction, so that pedestrians or vehicles can pass through the protection main board.
The utility model provides a ground cable carries protection device mounting structure, includes a ground cable and carries protection device 14, and a ground cable carries protection device 14 one side to set up a quick rush repair cable device.
As shown in fig. 1-2, the quick repair cable device comprises a motor side support 4 and a support 8, wherein a cable drum 1 is rotatably arranged between the upper part of the motor side support 4 and the upper part of the support 8, a speed reducer 6 is arranged on the motor side support 4, the input end of the speed reducer 6 is connected with a motor, the output end of the speed reducer 6 is connected with a driving sprocket 5, one end of the cable drum 1 is provided with a driven sprocket 3, and the driving sprocket 5 is connected with the driven sprocket 3 through a transmission chain 9.
As shown in fig. 3, a cable fixing structure is arranged on a cable drum 1, in this embodiment, the cable fixing structure includes a cable placing groove 1-1 and a hoop, the cable placing groove 1-1 is located at the periphery of the cable drum 1, the cable placing groove 1-1 fixes the middle part of a cable on the cable drum 1 through the hoop, in this embodiment, the cable placing groove 1-1 is C-shaped and symmetrically arranged at the periphery of the cable drum 1.
The cable drum 1 is provided with a cable separation structure, which in this embodiment comprises a separation ring 1-2, the separation ring 1-2 being located in the middle of the cable drum 1, perpendicular to the axis of the cable drum 1.
As shown in FIG. 4, the motor side bracket 4 comprises a mounting main board 4-1 and a speed reducer plate 4-6, wherein an operating bracket 4-2 is vertically mounted on the left side of the upper part of the mounting main board 4-1, an upper movable joint 4-5 is hinged in the upper part of the operating bracket 4-2, a screw rod 4-3 is connected in the upper movable joint 4-5 in a threaded manner, and a lower movable joint plate is arranged in the middle of the screw rod 4-3. The lower movable joint plate comprises a lower movable joint plate 4-8, the lower movable joint plate 4-8 is hinged with the lower movable joint plate, a hinged support 4-7 is vertically arranged on the right side of the upper part of the installation main plate 4-1, a right joint plate 4-9 is hinged in the hinged support 4-7, the left end of the speed reducer plate 4-6 is fixedly connected with the lower movable joint plate 4-8, and the right end of the speed reducer plate is fixedly connected with the right joint plate 4-9. The decelerator 6 is mounted on the decelerator mounting plate 4-6.
And a hand wheel 4-4 is arranged at the upper end of the screw rod 4-3, so that the operation is convenient.
As shown in fig. 5, a cable guide 12 is provided between the lower portion of the motor-side bracket 4 and the lower portion of the bracket 8. The cable arranging device 12 comprises a cable arranging device sliding rod 12-1, two ends of the cable arranging device sliding rod 12-1 are respectively connected with the lower part of the motor side bracket 4 and the lower part of the bracket 8, a cable arranging device sliding block 12-2 is connected in the cable arranging device sliding rod 12-1 in a sliding mode, a cable placing structure is arranged on the cable arranging device sliding block 12-2 and comprises a cable lower baffle rod 12-3, the cable lower baffle rod 12-3 is rotatably arranged on the cable arranging device sliding block 12-2, and a cable left vertical baffle rod 12-4 and a cable right vertical baffle rod 12-5 are rotatably arranged on two sides of the cable lower baffle rod 12-3 respectively.
As shown in FIG. 6, cable drum rotation installation parts are respectively arranged in the motor side bracket 4 and the bracket 8, each cable drum rotation installation part comprises a left vertical rod 13-1 and a right vertical rod 13-2, a roller block 13-3 is arranged between the left vertical rod 13-1 and the right vertical rod 13-2, a semicircular rotation installation roller 13-4 is arranged in the roller block 13-3, and the upper ends of the left vertical rod 13-1 and the right vertical rod 13-2 are in threaded connection with a cable drum baffle 13-5. The end of the cable drum 1 is positioned at the upper end of the roller 13-4, and the cable drum baffle 13-5 prevents the radial runout of the end of the cable drum 1. This construction facilitates quick replacement of the cable drum 1.
The working process of the invention is as follows:
the motor starts, drives the driving sprocket 5 to rotate through the speed reducer 6, and the driving sprocket 5 drives the driven sprocket 3 to rotate through the transmission chain 9, so that the cable 2 in the cable drum 1 is wound and unwound, and the discharged cable passes through the cable placing groove 14-2 when passing through the road surface, so that the cable is prevented from being trampled and damaged by vehicles or pedestrians.
The middle section of the cable 2 is arranged in the cable placing groove 1-1 through the anchor ear, two ends of the cable 2 are respectively positioned at two sides of the separating ring 1-2, and when the cable drum 1 rotates, two sides of the cable 2 can be simultaneously retracted and released. The spacer ring 1-2 prevents the cables on both sides from intertwining.
When the tension of the transmission chain 9 needs to be increased, the screw rod 4-3 is driven to rotate by rotating the hand wheel 4-4, so that the downward movement of the lower movable ring is realized, the downward movement of the lower movable ring drives the left end of the speed reducer plate 4-6 to move downwards, the distance between the driven chain wheel 3 and the driving chain wheel 5 is increased, the screw rod 4-3 surrounds the upper movable ring 4-5 to deflect clockwise, and the tension of the transmission chain 9 is increased.
When the cable drum 1 needs to be disassembled, the screw rod 4-3 is driven to rotate by rotating the hand wheel 4-4, so that the upward movement of the upper movable ring is realized, the upward movement of the upper movable ring drives the left end of the speed reducer plate 4-6 to move upwards, the distance between the driven chain wheel 3 and the driving chain wheel 5 is reduced, the screw rod 4-3 surrounds the upper movable ring 4-5 to deflect anticlockwise, the transmission chain 9 is loosened, and the cable drum 1 can be disassembled.
The cable 2 is positioned above the cable downshifting rod 12-3, between the cable left vertical baffle rod 12-4 and the cable right vertical baffle rod 12-5, the cable arranging device sliding block 12-2 slides left and right in the cable arranging device sliding rod 12-1 along with the displacement of the cable 2 in the winding and unwinding process, so that the friction loss of the cable is reduced.
Claims (4)
1. The utility model provides a ground cable carries protection device which characterized in that: the device comprises a protection main board (14-1), wherein a left bottom section (14-11) and a right bottom section (14-12) are arranged on two sides of the protection main board (14-1), the inner sides of the left bottom section (14-11) and the right bottom section (14-12) are respectively connected with a left slope section (14-13) and a right slope section (14-14), a cable groove protection section (14-15) is arranged between the left slope section (14-13) and the right slope section (14-14), a cable placing groove (14-2) is arranged below the cable groove protection section (14-15), insulating rubber (14-3) is arranged on the inner sides of the cable placing groove (14-2), a ground connection plate (14-4) is arranged on two sides of the left bottom section (14-11) and the right bottom section (14-12), and a connection through hole is formed in the ground connection plate (14-4); a left supporting plate (14-5) and a right supporting plate (14-6) are arranged below the left slope section (14-13) and the right slope section (14-14); the lower end of the cable trough protection section (14-15) is connected with a reinforcing transverse plate (14-16) in a bonding way; the protective main board (14-1) is a checkered plate.
2. The utility model provides a cable construction conveying structure which characterized in that: the structure comprises the ground cable conveying protection device according to claim 1, wherein a quick repair cable device is arranged on one side of the ground cable conveying protection device; the rapid rush-repair cable device comprises a motor side support (4) and a support (8), a cable drum (1) is rotatably arranged between the upper part of the motor side support (4) and the upper part of the support (8), a speed reducer (6) is arranged on the motor side support (4), the input end of the speed reducer (6) is connected with a motor, the output end of the speed reducer (6) is connected with a driving sprocket (5), one end of the cable drum (1) is provided with a driven sprocket (3), and the driving sprocket (5) is connected with the driven sprocket (3) through a transmission chain (9); the motor side support (4) comprises a mounting main board (4-1) and a speed reducer plate (4-6), an operation support (4-2) is vertically mounted on the left side of the upper part of the mounting main board (4-1), an upper movable joint (4-5) is hinged in the upper part of the operation support (4-2), a screw rod (4-3) is connected in the upper movable joint (4-5) in a threaded manner, and a lower movable joint clamping plate is arranged in the middle of the screw rod (4-3); the lower movable joint plate comprises a lower movable joint plate (4-8), wherein the lower movable joint plate (4-8) is hinged with a lower movable joint, a hinged support (4-7) is vertically arranged on the right side of the upper part of the installation main plate (4-1), a right joint plate (4-9) is hinged in the hinged support (4-7), the left end of the speed reducer plate (4-6) is fixedly connected with the lower movable joint plate (4-8), the right end of the speed reducer plate is fixedly connected with the right joint plate (4-9), and the speed reducer (6) is arranged on the speed reducer plate (4-6); a cable arranging device (12) is arranged between the lower part of the motor side bracket (4) and the lower part of the bracket (8); the cable arranging device (12) comprises a cable arranging device sliding rod (12-1), two ends of the cable arranging device sliding rod (12-1) are respectively connected with the lower part of the motor side bracket (4) and the lower part of the bracket (8), a cable arranging device sliding block (12-2) is connected in the cable arranging device sliding rod (12-1) in a sliding manner, and a cable placing structure is arranged on the cable arranging device sliding block (12-2); the cable placing structure comprises a cable lower baffle rod (12-3), the cable lower baffle rod (12-3) is rotatably mounted on the cable arranging device sliding block (12-2), and a cable left vertical baffle rod (12-4) and a cable right vertical baffle rod (12-5) are rotatably arranged on two sides of the cable lower baffle rod (12-3) respectively.
3. The cable construction transfer structure of claim 2, wherein: the cable drum rotating installation parts are respectively arranged in the motor side support (4) and the support (8), each cable drum rotating installation part comprises a left vertical rod (13-1) and a right vertical rod (13-2), a roller block (13-3) is arranged between the left vertical rod (13-1) and the right vertical rod (13-2), a semicircular rotating installation roller (13-4) is arranged in the roller block (13-3), and the upper ends of the left vertical rod (13-1) and the right vertical rod (13-2) are in threaded connection with a cable drum baffle (13-5); the end part of the cable drum (1) is positioned at the upper end of the roller (13-4).
4. The cable construction transfer structure of claim 2, wherein: a hand wheel (4-4) is arranged at the upper end of the screw rod (4-3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911228312.7A CN110829339B (en) | 2019-12-04 | 2019-12-04 | Ground cable conveying protection device and cable construction conveying structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911228312.7A CN110829339B (en) | 2019-12-04 | 2019-12-04 | Ground cable conveying protection device and cable construction conveying structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110829339A CN110829339A (en) | 2020-02-21 |
| CN110829339B true CN110829339B (en) | 2024-05-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911228312.7A Active CN110829339B (en) | 2019-12-04 | 2019-12-04 | Ground cable conveying protection device and cable construction conveying structure |
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| Country | Link |
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| CN (1) | CN110829339B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1205417A2 (en) * | 2000-11-09 | 2002-05-15 | Niederholz GmbH | Transport unit for electric cable |
| CN106300209A (en) * | 2015-06-04 | 2017-01-04 | 山东华联矿业股份有限公司 | Pass by one's way cable protecting device |
| CN108599081A (en) * | 2018-06-14 | 2018-09-28 | 祁建超 | A kind of road construction cable protecting device |
| CN110745652A (en) * | 2019-12-04 | 2020-02-04 | 国网江苏省电力有限公司无锡供电分公司 | Cable guiding and fixing device and cable construction conveying and guiding structure |
| CN211089082U (en) * | 2019-12-04 | 2020-07-24 | 国网江苏省电力有限公司无锡供电分公司 | Ground cable conveying protection device and cable construction conveying structure |
| CN211419187U (en) * | 2019-12-04 | 2020-09-04 | 国网江苏省电力有限公司无锡供电分公司 | Cable guiding and fixing device and cable construction conveying and guiding structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9438022B2 (en) * | 2014-01-28 | 2016-09-06 | Tri-Flex of Ohio, Inc. | Modular device for protecting cables and conduits |
-
2019
- 2019-12-04 CN CN201911228312.7A patent/CN110829339B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1205417A2 (en) * | 2000-11-09 | 2002-05-15 | Niederholz GmbH | Transport unit for electric cable |
| CN106300209A (en) * | 2015-06-04 | 2017-01-04 | 山东华联矿业股份有限公司 | Pass by one's way cable protecting device |
| CN108599081A (en) * | 2018-06-14 | 2018-09-28 | 祁建超 | A kind of road construction cable protecting device |
| CN110745652A (en) * | 2019-12-04 | 2020-02-04 | 国网江苏省电力有限公司无锡供电分公司 | Cable guiding and fixing device and cable construction conveying and guiding structure |
| CN211089082U (en) * | 2019-12-04 | 2020-07-24 | 国网江苏省电力有限公司无锡供电分公司 | Ground cable conveying protection device and cable construction conveying structure |
| CN211419187U (en) * | 2019-12-04 | 2020-09-04 | 国网江苏省电力有限公司无锡供电分公司 | Cable guiding and fixing device and cable construction conveying and guiding structure |
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| CN110829339A (en) | 2020-02-21 |
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