CN110230287A - A kind of tunnel automatic deicer according to driving big data control - Google Patents
A kind of tunnel automatic deicer according to driving big data control Download PDFInfo
- Publication number
- CN110230287A CN110230287A CN201910464933.9A CN201910464933A CN110230287A CN 110230287 A CN110230287 A CN 110230287A CN 201910464933 A CN201910464933 A CN 201910464933A CN 110230287 A CN110230287 A CN 110230287A
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- China
- Prior art keywords
- ice
- fixed
- deicer
- deicing
- big data
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
- E01H5/00—Removing snow or ice from roads or like surfaces; Grading or roughening snow or ice
- E01H5/12—Apparatus or implements specially adapted for breaking, disintegrating, or loosening layers of ice or hard snow with or without clearing or removing ; Roughening ice or hard snow by means of tools
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Signs Or Road Markings (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
A kind of tunnel automatic deicer according to driving big data control, the deicer includes running gear, lifting part and deicing mechanism, the lifting part is fixed on the platform of running gear, and in the fixed upper frame in the top of lifting part, deicing mechanism is connected above upper frame；The deicing mechanism is equipped with driving motor, the output shaft connecting bushing of the driving motor；Deicing mechanism is fixed in the outer rim of axle sleeve, first is fixed respectively and hits ice hockey, second hits ice hockey and ice remover, and described first, which hits ice hockey and second, hits ice hockey and be fixed on axle sleeve by elastic rod, and driving motor is fixed in motor fixing seat.The present invention can arrange deicing operation according to scheduled time big data, prevent ice cube from arbitrarily falling to ground, accidentally injure train and personnel, highly-safe.In addition to this, the present invention also effectively mitigates the labor intensity in operator's ice detachment, substantially increases deicing efficiency.
Description
Technical field
The present invention relates to a kind of cleaning device, especially a kind of deicer that can be operated in tunnel.
Background technique
With the increase year by year of railway traffic net, tunnel total length also increases severely year by year, the infiltration when weather cold, in tunnel
Water is readily generated icicle, and icicle suspension forms security risk in the sky.Since tunnel height is higher, train speed quickly, when
Also it will form very big impact force when icicle is fallen and cause significant damage, tunnel de-icing work is had in road network maintenance work
The vital task considered.
Existing deicing mainly manually deicing, maintenance workers hold a kind of tunnel deicing bar, set at the top of this deicing bar
T-type stamp and bracing wire are set, pulls bracing wire control T-type stamp to carry out deicing operation using manpower, long working personnel hold
Fatiguability, and stay length is unadjustable, using and it is inconvenient to carry.
For the labor intensity for mitigating artificial deicing, someone has invented a kind of deicing device of railway tunnel, in a telescopic rod
Top be arranged ice-melt mechanism, using hot water by ice-out, since the specific heat capacity of water is larger, numerical value is about 4.2 × 103J/
Ice-out is needed to consume a large amount of heat at ice water by (kg DEG C), this heat can only be mentioned by the battery of a large capacity
For, this be at the construction field (site) it is difficult to ensure that.
In addition, the deicing in the tunnel runed, also needs the train for considering constantly to speed past, if the ice cube pendant smashed
It falls ON TRAINS, it will form enormous impact, jeopardize train safety, therefore, this deicing operation must avoid vehicular traffic.Cause
This, studies a kind of automatic deicer it has been mentioned that in agenda.
Summary of the invention
The present invention is used to overcome the drawback of the prior art, provides a kind of tunnel automatic de-icing according to driving big data control
Device, it realizes deicing operation by power, reduces labor intensity, can also be using railways train operation big data as control deicing
The foundation of operation avoids still carrying out deicing when train arrives, prevents security risk.
Solving technical solution used by above-mentioned technical problem is:
A kind of tunnel automatic deicer according to driving big data control, the deicer include running gear, rise
Drop part and deicing mechanism, the lifting part are fixed on the platform of running gear, in the fixed upper machine in the top of lifting part
Seat, connects deicing mechanism above upper frame；The deicing mechanism is equipped with driving motor, the output axis connection of the driving motor
Axle sleeve；Deicing mechanism is fixed in the outer rim of axle sleeve, is fixed first respectively and is hit ice hockey, second hits ice hockey and ice remover, described
Blow ice hockey and second hits ice hockey and is fixed on axle sleeve by elastic rod, and driving motor is fixed in motor fixing seat.
The above-mentioned tunnel automatic deicer according to driving big data control, the lifting part are covered by lifting column, lifting
Cylinder and drive cylinder composition, the lifting column are connected with the piston rod of drive cylinder, are being gone up and down by drive cylinder driving lifting column
It is moved in sleeve, completes lifting action.
It is above-mentioned according to driving big data control tunnel automatic deicer, the running gear by base, traveling wheel, on
Sliding rail, glidepath, sliding block and traversing oil cylinder composition, the upper and lower sliding rail are fixed on base, and sliding block is driven by traversing oil cylinder
It is slided between upper and lower sliding rail, jacking sleeve is fixed on sliding block；Be equipped with clump weight in one end of base: traveling wheel is by movable motor
Driving.
The above-mentioned tunnel automatic deicer according to driving big data control, the deicer add control section, institute
Stating control section includes Bus Schedules monitoring center and the single-chip microcontroller being installed on deicer and the satellite being connected with single-chip microcontroller
Locating module, short-range wireless communication module and remote wireless communication module, the single-chip microcontroller pass through satellite positioning module acquisition pair
The location information for answering deicer is communicated by short-range wireless communication module with deicer, Bus Schedules monitoring center
Train time information is sent, and is communicated by internet, remote wireless communication module with single-chip microcontroller；The single-chip microcontroller control
The control circuit of deicer, the Bus Schedules sent according to train time stop making when train number is up to operation tunnel
Base, sliding block 14 are simultaneously retracted into home by industry, close deicer power supply.
The above-mentioned tunnel automatic deicer according to driving big data control, is added in the outer rim of axle sleeve except ice saw, institute
It states to remove and be connected between ice saw and axle sleeve by elastic rod；Except the sawtooth baseline tilt setting on ice saw, inclined angle alpha is 20-35 °.
The above-mentioned tunnel automatic deicer according to driving big data control, the described first weight for hitting ice hockey are greater than second
The weight of ice hockey is hit, the resilient lever length that ice hockey is hit in the connection first is less than the resilient lever length that ice hockey is hit in connection second.
The above-mentioned tunnel automatic deicer according to driving big data control, the ice remover are sheet made of sheet metal
Body, side are equipped with blade, and the ice remover is fixed on axle sleeve by elastic rod.
The above-mentioned tunnel automatic deicer according to driving big data control, is added between upper frame and motor fixing seat
Micro-adjusting mechanism is gone up and down, the lifting micro-adjusting mechanism is by lifting fine steps motor, driving gear, driven gear, Screw Pile and spiral shell
Line set composition, the driving gear and driven gear constitute transmission, and driving gear is fixed on thread bush, by lifting fine tuning step
The deicing height of thread bush rotary fine adjustment deicing mechanism is driven into motor；The corresponding lifting fine tuning of the height of the driven gear is predetermined
The maximum height of adjustment.
The above-mentioned tunnel automatic deicer according to driving big data control, adds ultrasonic sensor for ranging, the survey
It is fixed on the left side of sliding block away from ultrasonic sensor, the output signal control lifting fine steps of ultrasonic sensor for ranging
The deicing height of deicing mechanism is finely tuned in the rotation of motor.
The beneficial effects of the present invention are:
The present invention removes icicle by the impact force that high-speed rotating ice removal generates, wherein first hits ice hockey and second
It hits ice hockey and removes ice cube by tapping, hit ice hockey and second and hit ice hockey and be equipped with connecting spring due to first, to utilize spring
Elastic force improve tap strength, improve deicing effect.The lifting part can be adjusted according to the height of tunnel top；
Ice removal can be moved to left end by the sliding block of the running gear, remove the accumulated ice in tunnel at the top of railway.The present invention can be with
Deicing operation is arranged according to scheduled time big data, prevents ice cube from arbitrarily falling to ground, accidentally injures train and personnel, safety
It is high.In addition to this, the present invention also effectively mitigates the labor intensity in operator's ice detachment, substantially increases deicing efficiency.
Detailed description of the invention
Invention is described further with reference to the accompanying drawing.
Fig. 1 is overall structure of the present invention；
Fig. 2 is the structural schematic diagram for hitting mechanism of ice；
Fig. 3 is the electric functional block diagram of control section.
Each label respectively indicates in figure are as follows: 1, tunnel；2, deicing mechanism；3, driving motor；4, motor fixing seat；5, screw thread
Stake；6, thread bush；7, driven gear；8, driving gear；9, fine steps motor is gone up and down；10, upper frame；11, lifting column, 12,
Jacking sleeve, 13, drive cylinder；14, sliding block；15, upper sliding rail；16, camera；17, limited block, 18, traversing oil cylinder；19, match
Pouring weight, 20, first hit ice hockey；21, second ice hockey is hit；22, ice saw is removed；23, ice remover；24, axle sleeve；25 bases；26, it glides
Rail；27, tunnel platform.
Specific embodiment
Below with reference to embodiment, the invention will be further described.
Referring to Fig. 1, the deicer includes running gear, lifting part and deicing mechanism, and the lifting part is fixed
On the platform of running gear, in the fixed upper frame in the top of lifting part, deicing mechanism is connected above upper frame；It is described to remove
Mechanism of ice is equipped with driving motor, the output shaft connecting bushing of the driving motor；Deicing mechanism is fixed in the outer rim of axle sleeve, point
It does not fix first hit ice hockey, second hit ice hockey and ice remover, described first, which hits ice hockey and second, hits ice hockey and fix by elastic rod
On axle sleeve, driving motor is fixed in motor fixing seat.
Deicing mechanism of the invention is provided with different cutting tools and cuts off different types of icicle respectively, wherein first
It hits ice hockey and second to hit ice hockey and knock out icicle by gravity, in order to cope with different far and near, varying strength accumulated ice.First hits
The weight of ice hockey 20 is greater than the second weight for hitting ice hockey 21, but connects the resilient lever length that first hits ice hockey 20 and be less than connection second
The resilient lever length for hitting ice hockey 21 is directed to the biggish accumulated ice of intensity；And second hit ice hockey 21 weight is smaller but elastic rod
Length it is larger, it is corresponding farther out, the lesser icicle of intensity.Ice remover 23 and it is not easy the accumulated ice broken into pieces except ice saw 22 is corresponding, passes through
The blade of ice remover cuts off icicle with stronger local pressure；Except ice saw 22 then plays a role to the icicle for being more difficult to remove, with crowd
Obstinate icicle is cut off in the joint efforts of more sawtooth.Especially because except being connected between ice saw and axle sleeve by elastic rod, except on ice saw
Sawtooth baseline tilt setting, inclined angle alpha be 20-35 °, can because of the bending of being obstructed of elastic rod, make remove ice saw saw sword it is lucky
Pullled with level angle, formed to the sawing operation of icicle, form kerf on icicle, reduce the intensity of icicle, therewith by
First rushed to later hits ice hockey or second hits ice and smash, and falls down.According to field test, the joint of above-mentioned deicing operation is grasped
Make, deicing effect is more thorough.
Running gear of the invention is by base 25, traveling wheel, upper sliding rail 15, glidepath 26, sliding block 14 and traversing oil cylinder 18
Composition, the upper and lower sliding rail are fixed on 25 surface of base, and sliding block 14 can be slided by the driving of traversing oil cylinder 18 between upper and lower sliding rail
It is dynamic；Clump weight 19 is equipped in one end of base 25.Sliding block 14 can under the driving of traversing oil cylinder along tunnel platform 27 to moving to left
It is dynamic, it drives the deicing mechanism on top servo-actuated, goes to remove larger range of accumulated ice in tunnel.Limited block 17 is gone out for anti-limited slip block
Sliding rail.
Control section of the invention is used to monitor, control walking, displacement, deicing and the liaison of deicer, described
Control section includes Bus Schedules monitoring center and the single-chip microcontroller being installed on deicer and the satellite being connected with single-chip microcontroller
Position module, short-range wireless communication module and remote wireless communication module, the single-chip microcontroller obtain some by satellite positioning module
The location information of corresponding deicer is communicated by short-range wireless communication module with deicer, Bus Schedules monitoring
Center sends train time information, and is communicated by internet, remote wireless communication module with single-chip microcontroller；The single-chip microcontroller
The control circuit for controlling deicer stops making according to the Bus Schedules of train operation when train number is up to operation tunnel
Base, sliding block 14 are simultaneously retracted into home by industry, close deicer power supply.This control both can be distant by monitoring center
Control is completed, and can be completed by the control section being mounted on deicer.
The present invention can arrange deicing operation according to scheduled time big data, prevent ice cube from arbitrarily falling to ground, accidentally injure
Train and personnel, it is highly-safe.In addition to this, the present invention also effectively mitigates the labor intensity in operator's ice detachment, greatly
Deicing efficiency is improved greatly.
The present invention, since the sagging height of accumulated ice is different, needs to adjust the height of lifting part in operation.Of the invention
Lifting part is made of lifting column 11, jacking sleeve 12 and drive cylinder 13, and the lifting column 11 is connected with drive cylinder 13, and
It is driven by the latter and completes lifting action.
It is needing to hitting when mechanism of ice carries out high fine-tuning it is necessary to using height fine-adjustment mechanism.The present invention is in upper frame 10
The added lifting micro-adjusting mechanism between motor fixing seat 4, lifting micro-adjusting mechanism by lifting fine steps motor 9, driving gear 8,
Driven gear 7, Screw Pile 5 and thread bush 6 form, and drive the rotation of thread bush 6, fine tuning ice removing machine by lifting fine steps motor 9
The deicing height of structure 2；The maximum height of the corresponding predetermined adjustment of lifting fine tuning of the height of the driven gear.When being placed in Screw Pile
Thread bush 6 driving motor 9 drive rotate when, the Level Change of thread bush, deicing mechanism 2 deicing height finely tuned.
The height of driven gear of the invention is larger, and the maximum height of the corresponding predetermined adjustment of lifting fine tuning of size makes 8 He of driving gear
Driven gear 7 is in meshing state always during the adjustment, to realize optimal cutting result.
Elastic rod of the invention can use helical spring, rubber rods or rubber and plastic bar, as long as having enough intensity and elasticity
, elasticity can enable elastic rod bending, and in the bent state to make ice saw play sawing function under saw blade almost level angle
Energy.
Ultrasonic sensor for ranging 16 of the invention, can use HC-SR04, operating voltage be 5 volts, be easier with
Various single-chip microcontroller adapteds.It, using time difference and sound propagation velocity, cooperates single-chip microcontroller, meter by sending and receiving ultrasonic wave
Ultrasonic sensor is calculated to the distance of tunnel top accumulated ice, range accuracy can reach 1cm.
Operating process of the invention is: starting the running gear of deicing vehicle, deicing vehicle is made to run to tunnel vault suspension
At icicle, driving motor rotation rotates deicing knife rest, begins to switch off icicle.As icicle removes the continuous expansion of area, when
When deicing vehicle runs to the left end of tunnel platform, start traversing oil cylinder, piston rod pushes sliding block left lateral, continues deicing knife rest
It is moved to the left, to remove the accumulated ice at the top of tunnel platform central.
Claims (9)
1. a kind of tunnel automatic deicer according to driving big data control, it is characterized in that: the deicer includes walking
Partially, lifting part and deicing mechanism 2, the lifting part are fixed on the platform of running gear, on the top of lifting part
Fixed upper frame 10, connects deicing mechanism 2 above upper frame；The deicing mechanism is equipped with driving motor 3, the driving motor
3 output shaft connecting bushing 24；Deicing mechanism is fixed in the outer rim of axle sleeve 24, is fixed first respectively and is hit ice hockey 20, second hits
Ice hockey 21 and ice remover 23, described first, which hits ice hockey and second, hits ice hockey and is fixed on axle sleeve 24 by elastic rod, driving motor 3
It is fixed in motor fixing seat 4.
2. the tunnel automatic deicer according to claim 1 according to driving big data control, it is characterized in that: the liter
Drop part is made of lifting column 11, jacking sleeve 12 and drive cylinder 13, the piston rod of the lifting column 11 and drive cylinder 13
It is connected, drives lifting column 11 to move in jacking sleeve 12 by drive cylinder 13, complete lifting action.
3. the tunnel automatic deicer according to claim 1 according to driving big data control, it is characterized in that: the row
It walks part to be made of base 25, traveling wheel, upper sliding rail 15, glidepath 26, sliding block 14 and traversing oil cylinder 18, the upper and lower sliding rail
It is fixed on base 25, sliding block 14 is driven by traversing oil cylinder 18 and slided between upper and lower sliding rail, fixes jacking sleeve on sliding block 14
12；Be equipped with clump weight 19 in one end of base 25: traveling wheel is driven by movable motor.
4. the tunnel automatic deicer according to claim 1 according to driving big data control, it is characterized in that: described remove
Ice production apparatus adds control section, and the control section includes Bus Schedules monitoring center and the single-chip microcontroller that is installed on deicer
And satellite positioning module, short-range wireless communication module and the remote wireless communication module being connected with single-chip microcontroller, the single-chip microcontroller are logical
The location information that satellite positioning module obtains corresponding deicer is crossed, is led to by short-range wireless communication module with deicer
Letter, Bus Schedules monitoring center sends train time information, and is carried out by internet, remote wireless communication module and single-chip microcontroller
Communication；The control circuit of the single-chip microcontroller control deicer, will reach according to the Bus Schedules that train time is sent in train number
When to operation tunnel, stops operation and base 25, sliding block 14 are retracted into home, close deicer power supply.
5. the tunnel automatic deicer according to claim 1 according to driving big data control, it is characterized in that: in axle sleeve
It is added in 24 outer rim except ice saw 22, described remove passes through elastic rod connection between ice saw and axle sleeve；Except the sawtooth baseline on ice saw
It is obliquely installed, inclined angle alpha is 20-35 °.
6. the tunnel automatic deicer according to claim 1 according to driving big data control, it is characterized in that: described the
The weight of blow ice hockey 20 is greater than the second weight for hitting ice hockey 21, and the resilient lever length that ice hockey 20 is hit in the connection first, which is less than, to be connected
Connect the second resilient lever length for hitting ice hockey 21.
7. the tunnel automatic deicer according to claim 1 according to driving big data control, it is characterized in that: described remove
Skates 23 are plates made of sheet metal, and side is equipped with blade, and the ice remover is fixed on axle sleeve 24 by elastic rod.
8. the tunnel automatic deicer according to claim 1 according to driving big data control, it is characterized in that: in upper machine
Added lifting micro-adjusting mechanism between seat 10 and motor fixing seat 4, the lifting micro-adjusting mechanism is by lifting fine steps motor 9, master
Moving gear 8, driven gear 7, Screw Pile 5 and thread bush 6 form, and the driving gear 8 and driven gear 7 constitute transmission, main
Moving gear 8 is fixed on thread bush 6, and the deicing of 6 rotary fine adjustment deicing mechanism 2 of thread bush is driven by lifting fine steps motor 9
Highly；The maximum height of the corresponding predetermined adjustment of lifting fine tuning of the height of the driven gear.
9. the tunnel automatic deicer according to claim 1 according to driving big data control, it is characterized in that: adding survey
Away from ultrasonic sensor 16, the ultrasonic sensor for ranging is fixed on the left side of sliding block 14, ultrasonic sensor for ranging
Output signal control lifting fine steps motor 9 rotation, finely tune deicing mechanism 2 deicing height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910464933.9A CN110230287B (en) | 2019-05-30 | 2019-05-30 | Automatic tunnel deicing device controlled according to driving big data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910464933.9A CN110230287B (en) | 2019-05-30 | 2019-05-30 | Automatic tunnel deicing device controlled according to driving big data |
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| CN110230287A true CN110230287A (en) | 2019-09-13 |
| CN110230287B CN110230287B (en) | 2021-06-04 |
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| CN201910464933.9A Active CN110230287B (en) | 2019-05-30 | 2019-05-30 | Automatic tunnel deicing device controlled according to driving big data |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111146733A (en) * | 2020-02-10 | 2020-05-12 | 湖南省西城建设有限公司 | Height-adjustable cable pay-off rack and use method thereof |
| CN112186691A (en) * | 2020-09-28 | 2021-01-05 | 来一萍 | High-altitude cable deicing device with high safety performance for power construction |
| CN112681210A (en) * | 2021-01-15 | 2021-04-20 | 中车青岛四方机车车辆股份有限公司 | Third rail deicing device and method and train |
| CN113175164A (en) * | 2021-05-11 | 2021-07-27 | 蔡玉成 | Automatic deicing equipment in high altitude |
| CN115041433A (en) * | 2022-06-06 | 2022-09-13 | 华能大庆热电有限公司 | Automatic deicing device for solar-driven trolley of cooling water tower |
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| JP2000104233A (en) * | 1998-09-28 | 2000-04-11 | Matsushita Seiko Co Ltd | Heat pump snow melting device |
| CN203978492U (en) * | 2014-07-25 | 2014-12-03 | 中国路桥工程有限责任公司 | Extremely frigid zones railway tunnel automatic deicing apparatus |
| CN204000737U (en) * | 2014-08-18 | 2014-12-10 | 姜秀君 | Ice-snow on pavement breaker |
| CN206956652U (en) * | 2017-07-11 | 2018-02-02 | 山东东泰工程咨询有限公司 | A kind of tunnel vault deicer |
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| JP2000104233A (en) * | 1998-09-28 | 2000-04-11 | Matsushita Seiko Co Ltd | Heat pump snow melting device |
| CN203978492U (en) * | 2014-07-25 | 2014-12-03 | 中国路桥工程有限责任公司 | Extremely frigid zones railway tunnel automatic deicing apparatus |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111146733A (en) * | 2020-02-10 | 2020-05-12 | 湖南省西城建设有限公司 | Height-adjustable cable pay-off rack and use method thereof |
| CN112186691A (en) * | 2020-09-28 | 2021-01-05 | 来一萍 | High-altitude cable deicing device with high safety performance for power construction |
| CN112186691B (en) * | 2020-09-28 | 2021-12-21 | 国网天津市电力公司培训中心 | High-altitude cable deicing device with high safety performance for power construction |
| CN112681210A (en) * | 2021-01-15 | 2021-04-20 | 中车青岛四方机车车辆股份有限公司 | Third rail deicing device and method and train |
| CN113175164A (en) * | 2021-05-11 | 2021-07-27 | 蔡玉成 | Automatic deicing equipment in high altitude |
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| CN115041433A (en) * | 2022-06-06 | 2022-09-13 | 华能大庆热电有限公司 | Automatic deicing device for solar-driven trolley of cooling water tower |
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| CN110230287B (en) | 2021-06-04 |
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