CN113998528A - Pay-off device for power transmission line - Google Patents
Pay-off device for power transmission line Download PDFInfo
- Publication number
- CN113998528A CN113998528A CN202111437797.8A CN202111437797A CN113998528A CN 113998528 A CN113998528 A CN 113998528A CN 202111437797 A CN202111437797 A CN 202111437797A CN 113998528 A CN113998528 A CN 113998528A
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- Prior art keywords
- paying
- pay
- wheel
- transmission line
- power transmission
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H49/00—Unwinding or paying-out filamentary material; Supporting, storing or transporting packages from which filamentary material is to be withdrawn or paid-out
- B65H49/18—Methods or apparatus in which packages rotate
- B65H49/20—Package-supporting devices
- B65H49/32—Stands or frameworks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H61/00—Applications of devices for metering predetermined lengths of running material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/30—Handled filamentary material
- B65H2701/34—Handled filamentary material electric cords or electric power cables
Abstract
The invention provides a pay-off device for a power transmission line, which belongs to the technical field of power cables and comprises a movable base, a pay-off mechanism, a transmission mechanism and a control mechanism for controlling the pay-off mechanism and the transmission mechanism; the paying-off mechanism comprises a paying-off rack arranged on the movable base, a paying-off wheel wound with a cable and a first motor driving the paying-off wheel to rotate; the transmission mechanism comprises a support frame arranged on the movable base and a hanging ring arranged on the support frame; the control mechanism comprises a first rotating speed sensor and a first electronic counter which are arranged on the paying-off wheel, and a controller for controlling the first rotating speed sensor and the first electronic counter; the paying-off wheel is arranged on the paying-off rack through a rotating shaft. The pay-off device is convenient to use and mount, the position of the support column can be adjusted according to the size of the pay-off wheel, the operation is simple, the motor drives the pay-off wheel to pay off, manual rotation is not needed, meanwhile, the speed and the length of pay-off can be detected, the operation time is shortened, the labor intensity is reduced, the cost is saved, and time and labor are saved.
Description
Technical Field
The invention relates to the technical field of power cables, in particular to a pay-off device for a power transmission line.
Background
The power transmission line is realized by boosting the electric energy generated by the generator by using a transformer and then connecting the electric energy to the power transmission line through control equipment such as a circuit breaker, and the like. At present, when a cable is erected or laid, the cable is generally paid off in a coiling direction along the cable. The traditional power transmission line construction pay-off device is simple in structure and single in function, manual pay-off is carried out by workers, at least one person holds the cable head, and at least one person rotates a cable drum, so that only simple pay-off work can be carried out, the length of a paid-out electric wire cannot be measured, the cable with the actually paid-out length is not known, and the extra cable is required to be wound after the pay-off is finished; and the speed of the stayguy and the speed of the payoff are not easy to keep consistent, thus wasting time and labor.
Patent document No. CN112623858A discloses a pay-off device for a power transmission line, which includes a base, a moving wheel, a pay-off reel, two fixed lifting assemblies, two insertion rods, an adjusting assembly and a rotating assembly. Four corners of the bottom of the base are provided with movable wheels; the pay-off reel is placed at the top of the base, and a plurality of clamping blocks are distributed at two ends of the inner side of the central hole of the pay-off reel along the circumferential direction of the pay-off reel; two fixed lifting units are symmetrically and slidably connected to the top of the base and the two sides of the pay-off reel, and the distance between the two fixed lifting units is adjustable. This pay-off adjusts the interval between two fixed lifting unit through adjusting part for the inserted bar inserts the hollow inside in center of drawing drum, thereby makes fixture block and draw-in groove cooperation fix the drawing drum, then rises the drawing drum through fixed lifting unit and carries out the unwrapping wire operation, but this pay-off can not monitor out the length and the speed of unwrapping wire.
The patent with publication number CN207090649U discloses a power transmission line construction pay-off device, which belongs to the technical field of power transmission line construction and comprises a supporting mechanism provided with a base and a supporting frame, a pay-off mechanism arranged on the supporting frame, a detection mechanism used for detecting the rotating speed and the number of turns and a driving mechanism arranged on the base; the pay-off mechanism comprises a pay-off wheel arranged on the support frame through a wheel shaft, two ends of the support frame are provided with pay-off racks, a wire placing pipe is arranged on each pay-off rack, and a pulley is fixedly arranged at the wire inlet end of each wire placing pipe through a pulley frame; the detection mechanism comprises a digital counter and a first rotating speed sensor which are arranged on a wheel shaft, a second rotating speed sensor is arranged on the pulley, the first rotating speed sensor and the second rotating speed sensor are both connected with a controller in series, and the controller is connected with an alarm. The pay-off device can measure the length of a lead which is paid off, controls the speed of pay-off, and enables the speed of pay-off and stay wires to be consistent, but the pay-off mechanism is inconvenient to install when placed on a pay-off rack.
Disclosure of Invention
In view of the above, the present invention provides a pay-off device for a power transmission line.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a pay-off device for a power transmission line comprises a movable base, a pay-off mechanism and a transmission mechanism which are arranged on the movable base, and a control mechanism for controlling the pay-off mechanism and the transmission mechanism;
the paying-off mechanism comprises a paying-off rack arranged on the movable base, a paying-off wheel wound with a cable and a first motor driving the paying-off wheel to rotate;
the transmission mechanism comprises a support frame arranged on the movable base and a hanging ring arranged on the support frame;
the control mechanism comprises a first rotating speed sensor and a first electronic counter which are arranged on the paying-off wheel, and a controller which controls the first rotating speed sensor and the first electronic counter.
Furthermore, the paying-off wheel is arranged on the paying-off rack through a rotating shaft.
Furthermore, the movable base comprises a bottom plate and a travelling wheel arranged on the lower portion of the bottom plate, and a pull rod is arranged at one end of the bottom plate in an upward mode.
Furthermore, the pay-off rack comprises a sliding groove formed in the bottom plate, a supporting column arranged in the sliding groove and a baffle arranged on the supporting column, and the rotating shaft is connected with the baffle through a bearing.
Furthermore, the lower extreme of support column is equipped with first through-hole, the both sides of spout are equipped with a plurality of second through-holes.
Further, the width of the sliding groove is larger than that of the supporting column, the first through hole and the second through hole are fixed through bolts, and the supporting column is fixed in the sliding groove.
Furthermore, the support column sets up two, supports respectively the both ends of actinobacillus wheel, every all fixed setting on the support column the baffle, the pivot passes the baffle.
Furthermore, the support frame is located one side of pay off rack, the support frame is including setting up bracing piece on the bottom plate, the link sets up the tip of bracing piece, the cable passes through after paying out machine emits the link.
Furthermore, the output shaft of the first motor is connected with one end of the rotating shaft through a key, and the other end of the rotating shaft is provided with a crank.
Further, the first motor is supported by a support platform arranged on the bottom plate.
Along with the development of the power industry and the improvement of the load demand of a power grid, the ultrahigh voltage and long-distance power transmission technology are being vigorously developed in China, the traditional power transmission line generally adopts a paying-off wheel to complete paying-off operation, the paying-off wheel is a relatively common hand-operated paying-off device, and generally when paying off, the paying-off wheel needs to be paid off by using a mounting frame to fix the paying-off wheel or a paying-off reel frame, so that the operation is simple and convenient, but the fixation and the installation between the conventional paying-off wheel or the paying-off reel are troublesome, and the operation efficiency is not high. For this reason, those skilled in the electric power field have generally conducted studies in order to improve the pay-off efficiency. For example, patent document No. CN105293162A discloses a power transmission line iron tower pile paying-off device and a construction method thereof, which includes a bottom plate, the bottom plate is provided with a dovetail groove, a support plate is clamped into the dovetail groove through a bottom connecting piece and is installed on the bottom plate, and the power transmission line iron tower pile paying-off device is characterized in that: install the round pin on the backup pad and press from both sides, connecting rod one, connecting rod two and three component tripods of connecting rod are installed above the backup pad, wherein: a shaft bracket is arranged at the joint of the first connecting rod and the second connecting rod, and a pin IV is arranged at the bottom of the second connecting rod and penetrates into the supporting plate; the first connecting rod is connected with the third connecting rod through a second pin, and the third connecting rod is fixed in a pin clamp through a regulating pin; fix the device on the transport vechicle, drive its unwrapping wire that gos forward through the vehicle, the spool dismantles the convenience simultaneously, need not consume too much manpower, and the device is qualified for the next round of competitions fastly, does not twine between the circuit of being qualified for the next round of competitions simultaneously, is fit for using widely. The patent with publication number CN102064493B discloses a method for paying off and erecting a power transmission line by an unmanned helicopter, wherein the unmanned helicopter is used for taking off with an aramid rope and throwing the aramid rope to a designated tower position, then a Dinima rope is pulled by the aramid rope in a manual direct traction or small tractor traction mode, and then the Dinima rope is pulled to guide the rope; when the guide rope is pulled to the small traction station, the two sides are connected, and the large traction rope can be pulled after the guide rope is lifted off, so that the stringing work is completed. Unmanned aerial vehicle easy operation is nimble, and it is high to carry out overhead transmission line wire with it and erects the efficiency of construction, and job stabilization, the security is good, and need not fell construction passageways such as trees, does not disturb the people, does not destroy natural resources such as local geomantic. However, the length and speed of the paying-off are not considered in the actual operation of paying-off, when the length and speed of the paying-off are not matched with the traction speed, many problems such as large traction force or cable winding are generated, the paying-off construction efficiency is affected, and in the prior art, the cable is usually straightened through traction in the paying-off process, so that the traction force is increased.
Compared with the prior art, the invention has the following beneficial effects:
the invention comprises a movable base, a pay-off mechanism, a transmission mechanism and a control mechanism. The movable base comprises a bottom plate and traveling wheels, a pull rod is arranged at one end of the bottom plate upwards to facilitate pushing and pulling, and a cross rod is arranged on the pull rod and can be pulled forward by a machine. The paying-off mechanism comprises a paying-off rack, a paying-off wheel and a first motor, wherein a rotating shaft is arranged in the middle of the paying-off wheel and arranged on the paying-off rack, and the rotating shaft is driven to rotate by the first motor so as to pay off. The transmission mechanism comprises a support frame and a hanging ring, and the cable penetrates through the hanging ring after being released from the pay-off rack, so that the cable is convenient to pull. The control mechanism comprises a first rotating speed sensor, a first electronic counter and a controller, and the length of the paying-off is conveniently calculated by controlling the rotating speed and the number of turns of the paying-off wheel.
The pay-off rack comprises a sliding groove, a supporting column and a baffle, a plurality of second through holes are formed in the two sides of the sliding groove and fixed with the first through holes in the lower portion of the supporting column through bolts, and the supporting plate and the baffle are arranged in two. During the use, pass through the bolt fastening with a support column earlier on the spout, all press bearing and bearing frame with the both ends of pivot, fix the bearing frame of one end on the baffle of a support column, then adjust the position of second support column, fix on the spout through the bolt fastening equally, fix the bearing frame of the pivot other end on the baffle of second support column at last, accomplish the connection of pay off rack and actinobacillus wheel. The structure is convenient to connect, the position of the supporting column can be adjusted according to the size of the paying-off wheel, and the structure is flexible and convenient.
First motor setting is on supporting platform, and the output shaft passes through the key-type connection with the one end of pivot, and the other end of pivot is equipped with the crank, and when the length of needs unwrapping wire is short, rotatable crank, the unwrapping wire can.
The pay-off device is convenient to use and mount, the position of the support column can be adjusted according to the size of the pay-off wheel, the operation is simple, the motor drives the pay-off wheel to pay off, manual rotation is not needed, meanwhile, the speed and the length of pay-off can be detected, the operation time is shortened, the labor intensity is reduced, the cost is saved, and time and labor are saved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic structural view of a pay-off device according to embodiment 1 of the present invention.
Fig. 2 is a schematic structural view of a transmission mechanism according to embodiment 1 of the present invention.
Fig. 3 is a schematic structural view of a transmission mechanism according to embodiment 3 of the present invention.
Fig. 4 is a schematic structural diagram of a second transmission module according to embodiment 3 of the present invention.
Fig. 5 is a schematic structural view of a first transmission module of the present invention.
Fig. 6 is a schematic structural view of a first driven wheel in embodiment 3 of the invention.
Fig. 7 is a schematic structural diagram of a lifting platform according to embodiment 3 of the present invention.
The meaning of the respective reference numerals is as follows:
1: traveling wheel and 2: bottom plate, 3: chute, 4: second through hole, 5: support column, 6: a crank, 7: baffle, 8: a rotating shaft and 9: paying-off wheel, 10: cable, 11: first electronic counter, 12: first rotational speed sensor, 13: first motor, 14: supporting platform, 15: controller, 16: pull rod, 17: hanging ring, 18: supporting rod, 19: first drive wheel, 20: first belt, 21: first driven pulley, 22: second drive wheel, 23: second belt, 24: second driven wheel, 25: second housing, 26: third motor, 27: table, 28: hydraulic cylinder, 29: scissor arm support, 30: a base.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 7 of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
Example 1
As shown in fig. 1-2, the present embodiment provides a pay-off device for a power transmission line, including a moving base, a pay-off mechanism and a transmission mechanism that are disposed on the moving base, and a control mechanism that controls the pay-off mechanism and the transmission mechanism; the paying-off mechanism comprises a paying-off rack arranged on the movable base, a paying-off wheel 9 wound with a cable 10 and a first motor 13 driving the paying-off wheel 9 to rotate; the transmission mechanism comprises a support frame arranged on the movable base and a hanging ring 17 arranged on the support frame; the control mechanism comprises a first rotating speed sensor 12 and a first electronic counter 11 which are arranged on the paying-off wheel 9, and a controller 15 which controls the first rotating speed sensor 12 and the first electronic counter 11, the control mechanism adopts wireless connection, and the paying-off length is conveniently calculated by controlling the rotating speed and the number of turns of the paying-off wheel; the paying-off wheel 9 is arranged on the paying-off rack through a rotating shaft 8.
The movable base comprises a bottom plate 2 and a traveling wheel 1 arranged on the lower portion of the bottom plate 2.
Pay off rack is in including setting up spout 3, setting on the bottom plate 2 are in support column 5, the setting in the spout 3 are in baffle 7 on the support column 5, be connected through the bearing between pivot 8 and the baffle 7, support column 5 sets up two, supports the both ends of actinobacillus wheel 9 respectively.
The lower extreme of support column 5 is equipped with first through-hole, the both sides of spout 3 are equipped with a plurality of second through-holes 4, the width of spout 3 is greater than the width of support column 5, pass through the bolt fastening between first through-hole and the second through-hole 4, will support column 5 is fixed in the spout 3.
The support frame is located one side of pay off rack, the support frame is including setting up bracing piece 18 on the bottom plate 2, link 17 sets up the tip of bracing piece 18, cable 10 passes through pay off mechanism emits the back and passes link 17, cable 10 emits the back from the pay off rack, passes link 17, conveniently pulls.
During the use, pass through the bolt fastening with a support column earlier on the spout, all press bearing and bearing frame with the both ends of pivot, fix the bearing frame of one end on the baffle of a support column, then adjust the position of second support column, fix on the spout through the bolt fastening equally, fix the bearing frame of the pivot other end on the baffle of second support column at last, accomplish the connection of pay off rack and actinobacillus wheel. The structure is convenient to connect, the position of the supporting column can be adjusted according to the size of the paying-off wheel, and the structure is flexible and convenient.
Example 2
As shown in fig. 1-2, the present embodiment provides a pay-off device for a power transmission line, which is further optimized based on embodiment 1:
one end of the bottom plate 2 is upwards provided with a pull rod 16, and the pull rod 16 is provided with a cross rod, so that the traction is convenient.
The output shaft of first motor 13 with the key-type connection is passed through to the one end of pivot 8, the other end of pivot 8 is equipped with crank 6, and when the length of needs unwrapping wire is short, rotatable crank, the unwrapping wire can.
The first motor 13 is supported by a support platform 14 provided on the base plate 2.
Example 3
As shown in fig. 1 to 7, the present embodiment provides a pay-off device for a power transmission line, which is further optimized based on embodiment 2:
the transmission mechanism further comprises a first transmission module and a second transmission module which are arranged on one side of the support frame; the first transmission module and the second transmission module are both in belt transmission, the cable is clamped between the two belts, the cable is extruded and straightened, the traction efficiency is improved, and the construction progress is accelerated.
The first transmission module comprises a first driving shaft, a first driven shaft, a first driving wheel 19, a first driven wheel 21, a first belt 20 for connecting the first driving wheel 19 and the first driven wheel 21, and a second motor for driving the first driving shaft to rotate; the first driving wheel 19 is connected with a first driving shaft, and the first driven wheel 21 is connected with a first driven shaft; the first driving shaft and the first driven shaft are both arranged on the first shell through a bearing and a bearing sleeve.
The second transmission module comprises a second driving shaft, a second driven shaft, a second driving wheel 22, a second driven wheel 24, a second belt 23 for connecting the second driving wheel 22 with the second driven wheel 24, and a third motor 26 for driving the second driving shaft to rotate; the second driving wheel 22 is connected with a second driving shaft, and the second driven wheel 24 is connected with a second driven shaft; the second driving shaft and the second driven shaft are both arranged on the second shell 25 through a bearing and a bearing sleeve. The second driving wheel 22 and the second driven wheel 24 are disposed on one side of a second housing 25, and the third motor 26 is disposed on the other side of the second housing 26.
The lower side of the first belt 20 of the first transmission module contacts the cable 10, the upper side of the second belt 23 of the second transmission module contacts the cable 10, certain pressure is applied to the cable 10 in the vertical direction, the cable 10 is straightened, the rotation directions of the cable 10 and the cable are opposite, meanwhile, the cable 10 can be pulled forwards, the external traction force is reduced, and the traction efficiency is improved. The first transmission module and the second transmission module have similar structures, and of course, the first transmission module and the second transmission module may be separately disposed at the left and right sides of the cable 10 to straighten the left and right sides of the cable 10.
The lower parts of the first transmission module and the second transmission module are respectively provided with a lifting platform, the lifting platform comprises a base 30 arranged on the bottom plate 2, a scissor arm support 29 arranged on the base 30, a hydraulic cylinder 28 arranged on the scissor arm support 29 and a workbench 27 arranged on the scissor arm support 29, the first shell and the second motor are arranged on one lifting platform, and the second shell and the third motor are arranged on the other lifting platform and are lifted to adjust the height.
Example 4
As shown in fig. 1 to 7, the present embodiment provides a pay-off device for a power transmission line, which is further optimized based on embodiment 3:
between first belt 20 and first action wheel 22, the first driven wheel 21, all mesh through the meshing tooth between second belt 23 and second action wheel 22, the second driven wheel 24, first action wheel 19, the first driven wheel 21, the second action wheel 22, the second driven wheel 24 border is higher than first belt 20 or second belt 23.
A second rotating speed sensor and a second electronic counter are arranged on the first driving wheel 19; and a third rotating speed sensor and a third electronic counter are arranged on the second driving wheel 22.
Second revolution speed sensor and second electronic counter, third revolution speed sensor and third electronic counter all controlled by controller 15, adopt wireless connection, and controller 15 connects the alarm, through the control to first transmission module and second transmission module, monitors the speed of unwrapping wire and the speed of first transmission module, second transmission module, calculates unwrapping wire length and driven length, and when mismatching, the alarm reports to the police.
In the description of the present invention, it is to be understood that relational terms such as "a," "an," "two," and the like may be used solely to separate one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A pay-off device for transmission line is characterized in that: the pay-off mechanism and the transmission mechanism are arranged on the movable base, and the control mechanism is used for controlling the pay-off mechanism and the transmission mechanism;
the paying-off mechanism comprises a paying-off rack arranged on the movable base, a paying-off wheel wound with a cable and a first motor driving the paying-off wheel to rotate;
the transmission mechanism comprises a support frame arranged on the movable base and a hanging ring arranged on the support frame;
the control mechanism comprises a first rotating speed sensor and a first electronic counter which are arranged on the paying-off wheel, and a controller which controls the first rotating speed sensor and the first electronic counter.
2. The paying-off device for the power transmission line according to claim 1, characterized in that: the paying-off wheel is arranged on the paying-off rack through a rotating shaft.
3. The paying-off device for the power transmission line according to claim 2, characterized in that: the movable base comprises a bottom plate and a travelling wheel arranged on the lower portion of the bottom plate, and a pull rod is arranged at one end of the bottom plate in an upward mode.
4. The paying-off device for the power transmission line according to claim 3, characterized in that: the pay-off rack comprises a sliding groove arranged on the bottom plate, a supporting column arranged in the sliding groove and a baffle arranged on the supporting column, and the rotating shaft is connected with the baffle through a bearing.
5. The paying-off device for the power transmission line according to claim 4, wherein: the lower extreme of support column is equipped with first through-hole, the both sides of spout are equipped with a plurality of second through-holes.
6. The paying-off device for the power transmission line according to claim 5, wherein: the width of the sliding groove is larger than that of the supporting column, the first through hole and the second through hole are fixed through bolts, and the supporting column is fixed in the sliding groove.
7. The paying-off device for the power transmission line according to claim 6, wherein: the support column sets up two, supports respectively the both ends of actinobacillus wheel, every all fixed setting on the support column the baffle, the pivot passes the baffle.
8. The paying-off device for the power transmission line according to claim 7, wherein: the support frame is located one side of pay off rack, the support frame is including setting up bracing piece on the bottom plate, the link sets up the tip of bracing piece, the cable passes through after paying out machine emits the link.
9. The paying-off device for the power transmission line according to claim 8, wherein: the output shaft of the first motor is connected with one end of the rotating shaft through a key, and the other end of the rotating shaft is provided with a crank.
10. The paying-off device for the power transmission line according to claim 9, wherein: the first motor is supported by a supporting platform arranged on the bottom plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111437797.8A CN113998528B (en) | 2021-11-30 | 2021-11-30 | Paying-off device for power transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111437797.8A CN113998528B (en) | 2021-11-30 | 2021-11-30 | Paying-off device for power transmission line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113998528A true CN113998528A (en) | 2022-02-01 |
| CN113998528B CN113998528B (en) | 2023-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111437797.8A Active CN113998528B (en) | 2021-11-30 | 2021-11-30 | Paying-off device for power transmission line |
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| CN (1) | CN113998528B (en) |
Cited By (1)
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| CN114537253A (en) * | 2022-03-04 | 2022-05-27 | 国家电网有限公司 | Paying-off service vehicle and paying-off monitoring system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114537253A (en) * | 2022-03-04 | 2022-05-27 | 国家电网有限公司 | Paying-off service vehicle and paying-off monitoring system |
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| Publication number | Publication date |
|---|---|
| CN113998528B (en) | 2023-05-30 |
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