CN110970834A - Transmission line tension machine for evaluating bearing capacity of construction enterprise - Google Patents
Transmission line tension machine for evaluating bearing capacity of construction enterprise Download PDFInfo
- Publication number
- CN110970834A CN110970834A CN201911008301.8A CN201911008301A CN110970834A CN 110970834 A CN110970834 A CN 110970834A CN 201911008301 A CN201911008301 A CN 201911008301A CN 110970834 A CN110970834 A CN 110970834A
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- Prior art keywords
- transmission line
- stretching machine
- power transmission
- hydraulic
- module
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Classifications
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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
- H02G1/04—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables for mounting or stretching
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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
- B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
- B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
- B65H75/34—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables
- B65H75/38—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables involving the use of a core or former internal to, and supporting, a stored package of material
- B65H75/44—Constructional details
Abstract
The invention relates to a power transmission line tension machine for evaluating the bearing capacity of a construction enterprise, which comprises an underframe, a bracket arranged on the underframe and a winding drum arranged on the bracket, and is characterized in that: the stretching machine further comprises a state monitoring device, wherein the state monitoring device comprises an MCU and a GPS module, a vibration monitoring module, a charging module and a WIFI module which are connected with the MCU. By adopting the tension machine, the data of vibration, rotating speed, temperature and the like of the tension machine can be monitored in real time, an alarm can be given or a command can be given in time when a problem occurs, the problem and the damage of a wire or the tension machine can be effectively avoided, the stable work of the tension machine is ensured, and the accuracy of the bearing capacity evaluation of a construction enterprise is improved.
Description
Technical Field
The invention relates to the field of power systems, in particular to a power transmission line construction device, and particularly relates to a power transmission line tension machine for evaluating the bearing capacity of construction enterprises.
Background
With the rapid development of economy, the construction of domestic power grids is increasingly vigorous, and accordingly, a large number of construction enterprises are developed and grown. Meanwhile, the construction capacity of construction enterprises is high due to the fact that the construction work amount of the power grid is large and the time requirement is strict. Furthermore, accurate assessment of the bearing capacity of an enterprise becomes a basis for predicting the amount and progress of the construction project.
The current construction enterprise bearing capacity evaluation mainly considers the data of power transformation and line engineering under construction or planning, the specification and the number of the tension equipment, maintenance records and the like, wherein the working stability of the tension equipment becomes an important factor influencing the accuracy of the bearing capacity evaluation. The practical working condition of the tension machine is complex, the weight of the lead is heavy, various problems can occur in the matching between the winding drum and the lead, for example, the winding drum generates inertia when rotating, so that the phenomena that the rotating speed of the winding drum is too high, the wire conveying speed is too high, the cable wire falls in a mess, and the measurement of the paying-off size is inaccurate due to the fact that the winding drum speed is inconsistent with the lead speed when the winding drum is too fast; in addition, the tension generator of the tension machine can generate more heat, so that the tension generator is easy to overheat, and the equipment is damaged. And after the problems occur, the data can not be fed back to an operator or a control system in time, so that the system further has problems. Also, the angle of the drum cannot be adjusted as needed after the device is installed, and so on.
Therefore, it is an urgent need in the art to find a stretching machine which can solve various working condition problems in time and improve the service life and stability.
Disclosure of Invention
The invention aims to provide a power transmission line tension machine for evaluating the bearing capacity of a construction enterprise, which solves at least one problem, and comprises an underframe, a bracket arranged on the underframe and a winding drum arranged on the bracket, and is characterized in that: the stretching machine further comprises a state monitoring device, wherein the state monitoring device comprises an MCU and a GPS module, a vibration monitoring module, a charging module and a WIFI module which are connected with the MCU.
Further, it is characterized in that: the device also comprises a rotation monitoring module which is used for monitoring the rotating speed of the roller and recording the paying-off length of the tension equipment according to the rotating speed.
Further, it is characterized in that: the device also comprises a temperature detection module for detecting the temperature of the part of the stretching machine.
Further, it is characterized in that: the rotation detection module adopts a Hall sensor, a permanent magnet is arranged on the winding drum, and a magnetic Hall sensor is arranged at the corresponding position of the bracket.
Further, it is characterized in that: and an overspeed preventing device is arranged on the stretching machine.
Further, it is characterized in that: the overspeed device is arranged on the bracket and is movably connected with the winding drum.
Further, it is characterized in that: the tension applying mechanism of the tension machine comprises a hydraulic motor, a pump and a speed increaser.
Further, it is characterized in that: the hydraulic speed increaser is arranged between the hydraulic motor and the roller and is used for adjusting the rotating speed. A hydraulic pipeline is connected between the hydraulic oil outlet and the hydraulic oil inlet of the hydraulic motor, and a pump is arranged on the pipeline to drive the flow of the hydraulic oil.
Further, it is characterized in that: part of the hydraulic pipeline is arranged underground.
Further, it is characterized in that: the depth of the underground hydraulic pipeline is between 0.5 and 1 meter
The invention has the following effects:
by adopting the stretching machine, the data of vibration, rotating speed, temperature and the like of the stretching machine can be monitored in real time, and the alarm or the command can be sent out in time when a problem occurs, so that the problem and the damage of a lead or the stretching machine can be effectively avoided. Furthermore, the stretching machine can actively avoid the over-speed and the over-high temperature. Therefore, the stable work of the tension machine is ensured, and the accuracy of the bearing capacity evaluation of construction enterprises is improved.
Drawings
Fig. 1 is a front view of a main body structure of a tension body.
Fig. 2 is a top view of the structure of the tension and traction machine part.
Fig. 3 is a diagram of a monitoring system.
FIG. 4 is a plan view of the main body of the tension applying mechanism according to example 2.
FIG. 5 is a side view of the main body mechanism of the tension applying apparatus according to example 2.
Fig. 6 is a structural view of the overspeed device.
Fig. 7 is a structural view of another overspeed prevention device.
Fig. 8 is a schematic view of a heat dissipation system of the stretcher according to embodiment 3.
FIG. 9 is another schematic view of the heat dissipation system of the stretcher according to embodiment 3.
FIG. 10 is a front view of the main body mechanism of the tension applying mechanism according to embodiment 4.
Fig. 11 is a structural view of the height adjusting and anti-settling device.
Detailed Description
In order that those skilled in the art will better understand the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings and its implementation method.
Example 1:
referring to fig. 1 to 3, an intention of a power transmission line tensioning machine for evaluating the bearing capacity of a construction enterprise is shown in embodiment 1 of the present invention, which includes a base frame 1, a bracket 2 arranged on the base frame, and a winding drum 3 mounted on the bracket 2. The drum 3 is driven by a motor 4 and preferably a speed reducer 5 is provided between the motor 4 and the drum 3. In the case of the tension applying device, the driving motor 4 and the decelerator 5 may be omitted.
The stretching machine further comprises a state monitoring device, wherein the state monitoring device comprises an MCU (microprogrammed control unit) and a GPS (global positioning system) module, a vibration monitoring module, a rotation monitoring module, a temperature monitoring module, a charging module and a WIFI (wireless fidelity) module which are connected with the MCU. The GPS module is used for monitoring the working position and the altitude of the machine; the vibration monitoring module monitors and records the vibration condition of the tension machine during working through vibration and is used for evaluating the working state of the tension machine according to historical vibration data. The rotation monitoring module is used for monitoring the rotating speed of the roller and recording the paying-off length of the tension equipment, wherein preferably, the rotation detection module adopts a Hall sensor, a permanent magnet is arranged on the winding drum 3, and a magnetic Hall sensor is arranged at a certain position of the support 2. The length of unwrapping wire is calculated through the number of turns of reel motion, and the rotational speed is recorded simultaneously for assess the efficiency of construction, and judge whether the reel is overspeed. The temperature detection module is used for detecting the temperature of the position of the stretching machine part and comprises one or more temperature sensors; the charging module is used for charging the device by using a power supply of the stretching equipment when the stretching equipment works. The WIFI module is used for connecting a network, communicating with a remote server, for example, uploading data collected by the monitoring device to the server, or receiving a command sent by the server.
When the rotating speed is detected to exceed a preset value, the winding drum is considered to be overspeed, and at the moment, the MCU sends an instruction to a control device of the stretching machine to perform braking, stopping or other safety actions.
When the monitored vibration condition is obviously higher than a constant value, the stretching machine is considered to be in an unstable horizontal state and the like, and at the moment, the MCU sends an instruction to a control device of the stretching machine to perform braking, shutdown or other safe actions.
When the monitored temperature of the partial position exceeds a certain value, an instruction can be sent to the control device of the stretching machine through the MCU, and the heat dissipation device is started to work or is stopped.
By adopting the monitoring device, the working state of the traction and tensioning machine can be monitored in real time, once the foundation of the traction and tensioning machine is unstable, the temperature is overhigh or the winding drum is overspeed, an alarm can be sent out immediately or an instruction can be sent out directly to control the machine to act, and the problems of machine damage, incorrect traction and tensioning of a lead and the like are avoided.
Example 2:
fig. 4 to 7 show a structure diagram of the tensioner of embodiment 2, in which an overspeed preventing device is added as compared with embodiment 1, and specifically, it comprises a case 8, a large gear 31 provided inside the case 8 on the rotation shaft of the spool, a small gear 91 engaged therewith, and a speed reducing device 9 provided coaxially with the small gear 91.
The speed reducer 9 includes a rotating base 92, an outer peripheral member 93 fixedly connected to the outer side of the rotating base 92 and having a through hole formed at a partial position, and an elastic member 94 disposed in the through hole, wherein one end of the elastic member 94 is fixedly connected to the rotating base 92, and the other end thereof is connected to a friction block 95. A friction shoe 96 is provided in the housing 8 at a position opposite the friction block 95. The friction block 95 and the friction shoe 96 have a certain gap therebetween. The resilient member 94 may be a spring or a composite resilient structure.
When reel 3 rotates, drives pinion 91 through gear wheel 31 and rotates at a high speed, and then makes clutch blocks 95 overcome the elastic force of elastic component 94 under the centrifugal force effect and move to the direction of keeping away from the axis of rotation, and when speed reached the setting value, clutch blocks 95's displacement exceeded the clearance, and then contacted with friction tile 96 and took place the friction, and then realized the speed reduction to rotating base body 92, pinion 91, and then slowed down reel 3, had avoided the emergence of overspeed phenomenon automatically.
Although only one friction block 95 is shown in the figure, it should be understood that a plurality of friction blocks 95 may be provided, and when a plurality of friction blocks 95 are provided, the distance between the upper friction block 95 and the outer peripheral component 93 is smaller than the distance between the side friction block 95 and the outer peripheral component 93 to ensure that the distance between the friction block 95 and the friction shoe 96 is the same, considering that the weight of the friction block 95 causes a certain compression to the elastic component 94.
Wherein, preferably, an adjusting device, such as a screw structure, is connected to the friction shoe 96, and the gap between the friction shoe 96 and the friction block 95 can be adjusted externally, so as to adjust the over-speed threshold.
Wherein, the friction block 95 and the friction shoe 96 are made of materials with high friction coefficient.
Fig. 7 shows a structure of another overspeed preventing device, in which a cam 97 is provided at the end of a rotating base 92 (not shown), a plurality of through holes (3 shown) are formed in an outer peripheral member 93, an elastic member 94 is provided in the through holes, one end of the elastic member is connected to a friction block 95, and the lower end thereof is connected to a fixed block 98, and the fixed block 98 includes a contact 981 and an extension member 982 provided on the contact, wherein the extension member 982 is sized to fit the through holes and is movable along the through holes. The contact head 981 has a radial dimension greater than the outer diameter of the extension member 982. A spring (not shown) is provided outside the extension member 982, and one end of the spring abuts against the contact head 981 and the other end abuts against the inside of the outer shaft member 93 to apply a force pressing the fixed block 98 against the cam 97.
The cam comprises a plurality of sections of curved surfaces with gradually changed diameters, each section of curved surface is contacted with one fixed block 98, and the section of each section of curved surface is preferably in an involute shape.
The principle of preventing overspeed during operation is the same as that in fig. 6, when the threshold value of preventing overspeed needs to be adjusted, the friction shoes 96 can be adjusted by the thread device as in fig. 6, but this way needs to adjust a plurality of friction shoes respectively, which is troublesome, especially when the number is large. By adopting the scheme, when the adjustment is needed, the distance between the fixed block 98 and the axis of the cam 97 can be changed by rotating the cam 97 by a certain angle, and then the gap between the friction block 95 and the friction tile 96 is adjusted. Not shown, the cam 97 is provided with locking means (e.g. nut washers, etc.) for locking the position of the cam after rotation, to avoid undesired variations in the clearance due to rotation itself.
Example 3:
fig. 8 to 9 show a structure of a tensioner in embodiment 3 of the present invention, and the embodiment 3 focuses on a heat dissipation structure, and the structure of the other parts may be the same as in embodiments 1 to 2.
The tension applying device in the tensioner of the present embodiment mainly includes a hydraulic motor, a pump, and a speed increaser. The hydraulic speed increaser is arranged between the hydraulic motor and the roller and is used for adjusting the rotating speed. A hydraulic pipeline is connected between the hydraulic oil outlet and the hydraulic oil inlet of the hydraulic motor, and a pump is arranged on the pipeline to drive the flow of the hydraulic oil.
The important point of this embodiment is that a part of the hydraulic pipeline is arranged underground, preferably within 1 meter, more preferably more than 50 cm, and since the temperature under the ground in summer is significantly lower than that on the ground, the hydraulic oil in the pipeline can be effectively cooled. The length of the underground hydraulic line can be adjusted as required.
The during operation, hydraulic motor is in big moment of torsion state always, produces very high heat, the heat passes through hydraulic oil and transmits the underground through the pipeline, carries out the heat transfer cooling with soil in the underground, and hydraulic motor is returned to hydraulic motor after the cooling, carries out the heat transfer with the motor to carry out the heat dissipation circulation next time.
This scheme of adoption, direct as the heat pipe with hydraulic line itself to not set up extra heat abstractor, the thinking is novel, simple structure to the radiating effect is very good.
As shown in fig. 9, a regulating valve, a radiator and an interface component are further disposed on the hydraulic pipeline, wherein the regulating valve can regulate the pressure difference between the hydraulic oil inlet and the hydraulic oil outlet of the hydraulic motor, so as to regulate the torque at the output end of the hydraulic motor. The radiator is used as an additional radiating part and can further radiate the hydraulic oil in the pipeline. The interface member is positioned before the tubing enters the bottom for adjusting whether the tubing is accessed underground. Therefore, when the outdoor temperature is too high, the pipeline is connected to the underground, otherwise, the pipeline is only connected to the ground.
Example 4:
referring to fig. 10-11, there is shown a distractor of embodiment 4 of the invention which enables damping of the distractor, also enables adjustment of the angle of the drum relative to the wire, and actively accommodates local subsidence of the soil. Specifically, the bracket 2 is not directly connected to the base frame 1, but the bracket 2 is disposed on a second base frame 6, and the lower part of the second base frame 6 is connected to the base frame 1 through a height adjusting and anti-settling device 7.
The main structure of the device comprises a first support member 71, a second support member 72, a damping elastic member 73 and a filler 722; wherein the first support 71 comprises a base and an outer sleeve, the second support 72 comprises a top plate 720, a flexible connecting portion 725 and an inner sleeve 721, the inner sleeve 721 has a cover plate 726 and a lower cylindrical portion, the cylindrical portion can be used for placing fillers, the bottom of the cylindrical portion is provided with a one-way flow structure 723 (such as a one-way valve), and the inner sleeve can move in the outer sleeve. The flexible connection portion 725 may be a mild steel wire, a mild steel strip, a rigid-strength flexible resin material, etc., and in an initial state, the flexible connection portion 725 is in a straight structure under the action of gravity of the convex structure, and is in a bent recovery state when the distance between the inner sleeve and the top plate 720 becomes smaller. The damping elastic member 73 is disposed outside the outer sleeve, and both ends thereof support the top plate 720 and the base, respectively. Preferably, the damping elastic body 73 is a coil spring.
The inner sleeve and the outer sleeve are connected in a sealing manner, for example by sealing rings not shown in the figure. The check valve 723 is in one-way downward flow and is stopped in the opposite direction.
When the vibration of the tractor is transmitted to the second chassis 6, the vibration energy is absorbed by the contraction and return of the vibration-absorbing elastic body 73, fig. 7 shows a state that the vibration-absorbing elastic body 73 is contracted, and at this time, the top plate 720 of the second support member 72 moves downward, the protrusion structure is supported by the first support member 71 without movement, and the flexible connection portion 725 is bent. When the damping elastomer 73 is reset, the top plate 720 is reset and the flexible connection 725 returns to a straightened state. It should be noted that the dimensions are exemplary.
When the first support 71 is lowered downward due to soil subsidence, etc., the second chassis 6 is still supported due to the first support 71 having a portion that is not lowered, and the damping elastic member 73 of the damping device of the lowered portion is instantaneously and elastically deformed, and further the top plate 720 of the second support 72 is continuously supported, so that the top plate 720 is not immediately lowered, and the top plate 720 applies force to the inner sleeve 721 through the flexible connection portion 725, so that the inner sleeve 721 is not lowered. At this time, the first support 71 and the second support 72 are displaced, a space 712 is formed inside the outer sleeve of the first support 71, and hydraulic oil enters the first support 71 through the one-way valve under the action of gravity and atmospheric pressure and fills the space 712 to form a supporting force for the second support (see fig. 8). And the hydraulic oil does not reversely enter the inside of the second supporter 72 due to the check valve 723.
At this point, the flexible connection 725 between the top plate 720 and the inner sleeve 721 remains substantially straightened, without affecting the damping properties of the device.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The utility model provides a construction enterprise bearing capacity aassessment is with transmission line machine of stretching, includes the chassis, sets up the support on the chassis to and install the reel on the support, its characterized in that: the stretching machine further comprises a state monitoring device, wherein the state monitoring device comprises an MCU and a GPS module, a vibration monitoring module, a charging module and a WIFI module which are connected with the MCU.
2. The power transmission line stretching machine according to claim 1, characterized in that: the device also comprises a rotation monitoring module which is used for monitoring the rotating speed of the roller and recording the paying-off length of the tension equipment according to the rotating speed.
3. The power transmission line stretching machine according to claim 1, characterized in that: the device also comprises a temperature detection module for detecting the temperature of the part of the stretching machine.
4. The power transmission line stretching machine according to claim 2, characterized in that: the rotation detection module adopts a Hall sensor, a permanent magnet is arranged on the winding drum, and a magnetic Hall sensor is arranged at the corresponding position of the bracket.
5. The electric transmission line stretching machine according to any one of claims 1-4, characterized in that: and an overspeed preventing device is arranged on the stretching machine.
6. The power transmission line stretching machine according to claim 5, characterized in that: the overspeed device is arranged on the bracket and is movably connected with the winding drum.
7. The power transmission line stretching machine of claim 6, characterized in that: the tension applying mechanism of the tension machine comprises a hydraulic motor, a pump and a speed increaser.
8. The power transmission line stretching machine according to claim 7, characterized in that: the hydraulic speed increaser is arranged between the hydraulic motor and the roller and is used for adjusting the rotating speed. A hydraulic pipeline is connected between the hydraulic oil outlet and the hydraulic oil inlet of the hydraulic motor, and a pump is arranged on the pipeline to drive the flow of the hydraulic oil.
9. The power transmission line stretching machine according to claim 8, characterized in that: part of the hydraulic pipeline is arranged underground.
10. The power transmission line stretching machine according to claim 9, characterized in that: the depth of the hydraulic pipeline arranged underground is 0.5-1 meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911008301.8A CN110970834B (en) | 2019-10-22 | 2019-10-22 | Transmission line tension machine for evaluating bearing capacity of construction enterprise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911008301.8A CN110970834B (en) | 2019-10-22 | 2019-10-22 | Transmission line tension machine for evaluating bearing capacity of construction enterprise |
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| Publication Number | Publication Date |
|---|---|
| CN110970834A true CN110970834A (en) | 2020-04-07 |
| CN110970834B CN110970834B (en) | 2021-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911008301.8A Expired - Fee Related CN110970834B (en) | 2019-10-22 | 2019-10-22 | Transmission line tension machine for evaluating bearing capacity of construction enterprise |
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| CN (1) | CN110970834B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202141473U (en) * | 2011-07-19 | 2012-02-08 | 河南送变电建设公司 | Intelligent monitoring device for tension stringing of overhead power transmission line |
| CN103760839A (en) * | 2013-11-26 | 2014-04-30 | 国网上海市电力公司 | 500kV aerial cable intelligent coordination control device of stretching machine |
| CN204205410U (en) * | 2014-10-13 | 2015-03-11 | 国家电网公司 | Large-tonnage stretching all-in-one |
| CN205666544U (en) * | 2016-06-14 | 2016-10-26 | 国网山东省电力公司阳谷县供电公司 | A machine is led in electric wire netting construction |
| CN208010803U (en) * | 2018-01-09 | 2018-10-26 | 牧德科技（北京）有限公司 | Centrifugal braking device and descending lifeline with it |
| CN108963873A (en) * | 2018-06-26 | 2018-12-07 | 国网山东省电力公司滨州市沾化区供电公司 | A kind of power grid construction stretching machine |
| CN109282022A (en) * | 2018-10-19 | 2019-01-29 | 南安知风舟工业设计有限公司 | Power scheduling power grid construction stretching machine |
| CN209177756U (en) * | 2018-12-05 | 2019-07-30 | 河南送变电建设有限公司 | A kind of separated time tensioner hydraulic self-adapting system |
-
2019
- 2019-10-22 CN CN201911008301.8A patent/CN110970834B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202141473U (en) * | 2011-07-19 | 2012-02-08 | 河南送变电建设公司 | Intelligent monitoring device for tension stringing of overhead power transmission line |
| CN103760839A (en) * | 2013-11-26 | 2014-04-30 | 国网上海市电力公司 | 500kV aerial cable intelligent coordination control device of stretching machine |
| CN204205410U (en) * | 2014-10-13 | 2015-03-11 | 国家电网公司 | Large-tonnage stretching all-in-one |
| CN205666544U (en) * | 2016-06-14 | 2016-10-26 | 国网山东省电力公司阳谷县供电公司 | A machine is led in electric wire netting construction |
| CN208010803U (en) * | 2018-01-09 | 2018-10-26 | 牧德科技（北京）有限公司 | Centrifugal braking device and descending lifeline with it |
| CN108963873A (en) * | 2018-06-26 | 2018-12-07 | 国网山东省电力公司滨州市沾化区供电公司 | A kind of power grid construction stretching machine |
| CN109282022A (en) * | 2018-10-19 | 2019-01-29 | 南安知风舟工业设计有限公司 | Power scheduling power grid construction stretching machine |
| CN209177756U (en) * | 2018-12-05 | 2019-07-30 | 河南送变电建设有限公司 | A kind of separated time tensioner hydraulic self-adapting system |
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| CN110970834B (en) | 2021-04-02 |
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