CN108981556A - A kind of pantograph pan wear detector and its detection method - Google Patents
A kind of pantograph pan wear detector and its detection method Download PDFInfo
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- CN108981556A CN108981556A CN201810756111.3A CN201810756111A CN108981556A CN 108981556 A CN108981556 A CN 108981556A CN 201810756111 A CN201810756111 A CN 201810756111A CN 108981556 A CN108981556 A CN 108981556A
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- pantograph pan
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
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- Current-Collector Devices For Electrically Propelled Vehicles (AREA)
Abstract
The invention discloses a kind of pantograph pan wear detectors, including pantograph pan, pantograph pan front and rear sides face upper end is slidably fitted with the conductivity detection item that upper surface is flushed with the upper surface of the pantograph pan, and the conductivity detection outer surface is coated with coatings；Pantograph pan front and rear sides face lower end is fixedly installed with the push-rod electric machine that push rod cup is fixedly connected with the conductivity detection item vertically.Beneficial effect is: a kind of pantograph pan wear detector of the present invention and its detection method can replace manually carrying out abrasion detection to pantograph pan, and detection speed is fast, high-efficient, detection effect is good, and it is not easy missing inspection occur, human cost is effectively reduced, practicability is good.
Description
Technical field
The present invention relates to pantograph pan fields, and in particular to a kind of pantograph pan wear detector and its detection side
Method.
Background technique
Pantograph pan is the component of pantograph Yu power grid contact electricity getting, currently, common slide plate is usually by stone in the market
It is black to be made with other metal alloys, since pantograph pan screen is very fast (general up to 350km/h), graphite abrasion
Compare it is severe, therefore installed on locomotive pantograph pan needs periodically overhauled；
Currently, being typically all that artificial eye is relied on to detect for the abrasion detection of pantograph pan, due to being installed on locomotive
Pantograph pan quantity it is more, and number of locomotives is also very much, therefore it is very huge to detect workload, therefore detects work and spent
The human cost taken is higher, while artificial detection speed is also unhappy, and is easy to appear missing inspection problem.
Summary of the invention
The object of the invention is that provide to solve the above-mentioned problems a kind of pantograph pan wear detector and
Its detection method, to solve, traditional abrasion condition by artificial detection pantograph pan is relatively time-consuming in the prior art takes
Power, detection speed is slow, low efficiency, and is easy to appear missing inspection, detects the problems such as spent human cost is also relatively high.This hair
Preferred technical solution can be realized instead of manually carrying out abrasion detection to pantograph pan in many technical solutions of bright offer,
It detects that speed is fast, and high-efficient, detection effect is good, and is not easy missing inspection occur, is effectively reduced human cost, the skills such as practicability is good
Art effect, elaboration as detailed below.
To achieve the above object, the present invention provides following technical schemes:
A kind of pantograph pan wear detector provided by the invention, including pantograph pan, the pantograph pan front and back
Two sides upper end is slidably fitted with the conductivity detection item that upper surface is flushed with the upper surface of the pantograph pan, the conductive inspection
It surveys an outer surface and is coated with coatings；Pantograph pan front and rear sides face lower end is fixedly installed with push rod cup and institute vertically
State the push-rod electric machine that conductivity detection item is fixedly connected；
The conductivity detection both ends are electrically connected by detection conducting wire, are in series with ammeter, battery and inspection on the detection conducting wire
Survey switch；
The pantograph pan lower surface is provided with slideway, and the slideway includes being fixedly connected with the pantograph pan lower surface
Slide and disassembly be mounted on the slip lid of the slide lower end, the side of the slip lid and the slide forms sliding slot, the cunning
Sliding block is slidably fitted in slot；Rack gear is fixedly installed in the slide inside bottom surface, engagement connection rack gear on the rack gear,
The gear ring is sleeved in hub motor, and the hub motor is mounted in the slideway by wheel shaft rolling, the wheel shaft one
End is detachably fixed with the sliding block to be connect；
Described sliding block one end stretches out the sliding slot and is fixedly installed with rotating electric machine, fixed peace on the output shaft of the rotating electric machine
Equipped with cleaning bar, the cleaning bar upper end is fixedly installed with the U-shaped cleaning brush being slidably located on the conductivity detection item.
Preferably, the push-rod electric machine quantity has multiple, and it is evenly distributed on pantograph pan front and rear sides face
On.
Preferably, the conductivity detection lower surface is fixedly installed with insulation jacking block；
Wherein, the push rod cup of the push-rod electric machine upper end is fixedly connected with the insulation jacking block.
Preferably, the ammeter, the battery and the detection switch are arranged in locomotive driving room.
Preferably, the conductivity detection item is made of materials A；
Wherein, the pantograph pan is made of material B；
Wherein, the wear-resisting property of the materials A is less than or equal to the wear-resisting property of the material B.
A kind of pantograph pan wear detecting method is ground using pantograph pan described in claim 1-5 any one
It damages detection device and executes following steps:
Step 1: push-rod electric machine is installed on the pantograph pan of locomotive roof, is then installed to conductivity detection item described
On push-rod electric machine and flush the conductivity detection upper surface with the upper surface of the pantograph pan；
Step 2: the conductivity detection both ends and ammeter, battery and the detection in locomotive driving room are opened with detection conducting wire
Series connection is closed, the detection switch is then closed, observes and records the current value A on the ammeter；
Step 3: locomotive driving for a period of time after, when needing to detect the electric current for flowing through the ammeter again, can first control
Cleaning bar is driven to rotate upwards for rotating electric machine rotation until U-shaped cleaning brush is fastened on the conductivity detection item, and then starting is taken turns
The rotation of hub motor drives ring gear against rotation, and since the gear ring is engaged with rack, the hub motor rotation can drive sliding block
It is slided in sliding slot, and then the rotating electric machine is driven to slide along the sliding slot, make the U-shaped cleaning brush in the conductive inspection
It surveys on item and moves, scrub the conductivity detection item；
Step 4: scrubbing clean to the conductivity detection item, when the foreign of surface, first controls the rotating electric machine rotation and drives institute
It states U-shaped cleaning brush and leaves the conductivity detection item, be then closed the detection switch, observe and record the electricity on the ammeter
Flow valuve B；
Step 5: since the supply voltage of the battery is certain, the current value detected by the ammeter can be counted
The resistance of the conductivity detection item is calculated, and then the conductivity detection item can be calculated according to the material of the conductivity detection item
Cross section, it is clear that the cross section of the conductivity detection item current value A intact when corresponding, and the current value B is corresponding
Be the cross section of the conductivity detection item after abrasion, and then the conductive inspection can be judged according to the size of two cross sections
Survey the abrasion condition and the degree of wear of item.
Preferably, the cross section of conductivity detection item described in step 5 can be calculated according to resistance formula R=ρ L/S；
Wherein, R is the resistance of the conductivity detection item, and ρ is the resistivity of the conductivity detection item, and L is the conductivity detection item
Length, S is the cross-sectional area of the conductivity detection item.
Preferably, if the power grid of locomotive upper end has electricity at this time, being needed before operating procedure two, step 3 and arrangement four
It first to control the push-rod electric machine and drive the conductivity detection item decline, the conductivity detection upper surface is made not connect with power grid
Touching, then just can be carried out step operation.
Preferably, U-shaped cleaning brush described in step 3 needs periodic cleaning to safeguard.
Beneficial effect is: a kind of pantograph pan wear detector of the present invention and its detection method being capable of generations
For manually abrasion detection is carried out to pantograph pan, detection speed is fast, and high-efficient, detection effect is good, and is not easy to leak
Inspection, is effectively reduced human cost, practicability is good.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is main view of the invention；
Fig. 2 is the partial enlarged view of Fig. 1 of the invention；
Fig. 3 is the cross-section diagram of pantograph pan and slideway in Fig. 1 of the invention；
Fig. 4 is the partial enlarged view of Fig. 3 of the invention；
Fig. 5 is the connection structure diagram of rotating electric machine and slideway of the invention.
The reference numerals are as follows:
1, pantograph pan；2, conductivity detection item；3, push-rod electric machine；4, insulate jacking block；5, coatings；6, conducting wire is detected；7,
Battery；8, ammeter；9, detection switch；10, slideway；11, sliding slot；12, slide；13, slip lid；14, rack gear；15, gear ring；16,
Hub motor；17, wheel shaft；18, sliding block；19, rotating electric machine；20, cleaning bar；21, U-shaped cleaning brush.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical solution of the present invention will be carried out below
Detailed description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained all without making creative work
Other embodiment belongs to the range that the present invention is protected.
Referring to shown in Fig. 1-Fig. 5, a kind of pantograph pan wear detector provided by the invention, including pantograph pan
1,1 front and rear sides face upper end of pantograph pan is slidably fitted with the conductive inspection that upper surface is flushed with the upper surface of pantograph pan 1
Item 2 is surveyed, conductivity detection item 2 is used as detection resistance, ought be by since conductivity detection item 2 is flushed with 1 upper surface of pantograph pan
When 1 upper surface of pantograph slider and power grid contact wear, 2 upper surface of conductivity detection item also contacts with power grid and is worn, and wears journey
Degree is consistent, and its resistance also changes therewith after changing because of the cross section of conductivity detection item 2, therefore can be according to resistance
Change to extrapolate the abrasion condition of the cross section of conductivity detection item 2,2 outer surface of conductivity detection item is coated with coatings 5, absolutely
Edge coating 5 is short-circuit for being electrically connected after preventing conductivity detection item 2 from contacting with pantograph pan 1；1 front and rear sides of pantograph pan
Face lower end is fixedly installed with the push-rod electric machine 3 that push rod cup is fixedly connected with conductivity detection item 2 vertically, and push-rod electric machine 3 is for driving
The decline of conductivity detection item 2 is not contacted with power grid, since the power grid of locomotive upper end has electricity, carries out electric current to conductivity detection item 2
It must assure that conductivity detection item 2 does not contact electrical connection with power grid when detection, in this way, can avoid short circuit occur in detection process；
2 both ends of conductivity detection item are electrically connected by detection conducting wire 6, are in series with ammeter 8, battery 7 and detection on detection conducting wire 6 and are opened
9 are closed, battery 7 is used to power for detection circuit, and ammeter 8 is used for detecting the electric current for flowing through conductivity detection item 2, detection switch 9
6 on-off of conducting wire is detected in control；
1 lower surface of pantograph pan is provided with slideway 10, and slideway 10 is slided for rotating electric machine 19 along pantograph pan 1, sliding
Road 10 includes the slip lid 13 that the slide 12 being fixedly connected with 1 lower surface of pantograph pan and disassembly are mounted on 12 lower end of slide, sliding
The side of lid 13 and slide 12 forms sliding slot 11, sliding block 18 is slidably fitted in sliding slot 11, sliding block 18 is for driving U-shaped cleaning brush
21 slide on conductivity detection item 2, clean the sundries on 2 surface of conductivity detection item, guarantee that detection data is accurate, sundries is avoided to influence
Testing result, to realize the good technical effect of detection effect；Rack gear 14, rack gear 14 are fixedly installed in 12 inside bottom surface of slide
Upper engagement connects rack gear 15, and gear ring 15 is sleeved in hub motor 16, and hub motor 16 is used for band movable slider 18 in sliding slot 11
Interior sliding, hub motor 16 are mounted in slideway 10 by the rolling of wheel shaft 17,17 one end of wheel shaft and 18 company of being detachably fixed of sliding block
It connects；
18 one end of sliding block stretches out sliding slot 11 and is fixedly installed with rotating electric machine 19, is fixedly installed on the output shaft of rotating electric machine 19
Cleaning bar 20, rotating electric machine 19 are cleaned for driving the rotation of cleaning bar 20 that U-shaped cleaning brush 21 is made to snap into conductivity detection item 2
20 upper end of bar is fixedly installed with the U-shaped cleaning brush 21 being slidably located on conductivity detection item 2.
As optional embodiment, 3 quantity of push-rod electric machine has multiple, and is evenly distributed on the front and back of pantograph pan 1 two
On side, multiple push-rod electric machines 3 guarantee that conductivity detection item 2 can against pantograph pan 1 and steadily move up and down.
2 lower surface of conductivity detection item is fixedly installed with insulation jacking block 4, and insulation jacking block 4 is for preventing conductivity detection item 2 and pushing away
Bar motor 3 is electrically connected；
Wherein, the push rod cup of 3 upper end of push-rod electric machine is fixedly connected with insulation jacking block 4.
Ammeter 8, battery 7 and detection switch 9 are arranged in locomotive driving room, are designed in this way, and when detection, worker is without climbing
Climb to locomotive roof, abrasion detection operation can be carried out by being sitting in driver's cabin, therefore detect speed than it is traditional by naked eyes into
The speed of row detection is fast, high-efficient, and is not easy missing inspection occur, human cost is effectively reduced, practicability is good.
Conductivity detection item 2 is made of materials A；
Wherein, pantograph pan 1 is made of material B；
Wherein, the wear-resisting property of materials A is less than or equal to the wear-resisting property of material B, designs in this way, prevents power grid abrasion aggravation,
Due to increasing conductivity detection item 2, power grid will receive the friction of conductivity detection item 2 and pantograph pan 1 to it, if conductive
Detector bar 2 is more wear-resisting, then is easy to make power grid abrasion aggravation, and can make power grid and 1 poor contact of pantograph pan.
A kind of pantograph pan wear detecting method wears inspection using the pantograph pan of claim 1-5 any one
It surveys device and executes following steps:
Step 1: push-rod electric machine 3 is installed on the pantograph pan 1 of locomotive roof, is then installed to conductivity detection item 2 and is pushed away
On bar motor 3 and flush 2 upper surface of conductivity detection item with the upper surface of pantograph pan 1, only upper surface, which flushes, to protect
Demonstrate,prove the accurate of testing result；
Step 2: 2 both ends of conductivity detection item and ammeter 8, battery 7 and the detection in locomotive driving room are opened with detection conducting wire 6
9 series connection are closed, then occlusion detection switch 9, observes and records the current value A on ammeter 8；
Step 3: locomotive driving for a period of time after, when needing to detect the electric current for flowing through ammeter 8 again, can first control rotation
Rotation is until U-shaped cleaning brush 21 is fastened on conductivity detection item 2 the rotation drive of rotating motor 19 cleaning bar 20 upwards, and then starting is taken turns
The rotation of hub motor 16 drives gear ring 15 to rotate, and since gear ring 15 is engaged with rack gear 14, the rotation of hub motor 16 can drive cunning
Block 18 slides in sliding slot 11, and then rotating electric machine 19 is driven to slide along sliding slot 11, makes U-shaped cleaning brush 21 in conductivity detection item
It is moved on 2, scrubs conductivity detection item 2, prevent the sundries fallen on conductivity detection item 2 from influencing detection data；
Step 4: scrubbing clean to conductivity detection item 2, when the foreign of surface, first controls the rotation of rotating electric machine 19 and drives U-shaped cleaning
Brush 21 leaves conductivity detection item 2, and then occlusion detection switch 9, observes and records the current value B on ammeter 8；
Step 5: since the supply voltage of battery 7 is certain, it can be calculated and be led by the current value that ammeter 8 detects
The resistance of electro-detection item 2, and then the cross section of conductivity detection item 2 can be calculated according to the material of conductivity detection item 2, it is clear that electric current
The cross section of conductivity detection item 2 value A intact when corresponding, and current value B it is corresponding be abrasion after conductivity detection item 2 cross
Section, and then the abrasion condition and the degree of wear of conductivity detection item 2 can be judged according to the size of two cross sections.
As optional embodiment, in step 5 the cross section of conductivity detection item 2 can according to resistance formula R=ρ L/S into
Row calculates；
Wherein, R is the resistance of conductivity detection item 2, and ρ is the resistivity of conductivity detection item 2, and L is the length of conductivity detection item 2, and S is
For the cross-sectional area of conductivity detection item 2.
Before operating procedure two, step 3 and arrangement four, if the power grid of locomotive upper end has electricity at this time, needs first to control and push away
Bar motor 3 drives conductivity detection item 2 to decline, and so that 2 upper surface of conductivity detection item is not in contact with power grid, then just can be carried out step
Operation can avoid conductivity detection item 2 with power grid generation short circuit in this way and burn conductivity detection item 2.
U-shaped cleaning brush 21 needs periodic cleaning to safeguard in step 3, designs in this way, and it is preferable to guarantee that U-shaped cleaning brush 21 has
Cleaning effect.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (9)
1. a kind of pantograph pan wear detector, including pantograph pan (1), it is characterised in that: the pantograph pan
(1) front and rear sides face upper end is slidably fitted with the conductivity detection item that upper surface is flushed with the upper surface of the pantograph pan (1)
(2), conductivity detection item (2) outer surface is coated with coatings (5)；Pantograph pan (1) the front and rear sides face lower end
It is fixedly installed with the push-rod electric machine (3) that push rod cup is fixedly connected with the conductivity detection item (2) vertically；
Conductivity detection item (2) both ends are electrically connected by detection conducting wire (6), are in series with ammeter on the detection conducting wire (6)
(8), battery (7) and detection switch (9)；
Pantograph pan (1) lower surface is provided with slideway (10), and the slideway (10) includes and the pantograph pan (1)
Slide (12) and disassembly that lower surface is fixedly connected are mounted on the slip lid (13) of the slide (12) lower end, the slip lid (13) and
The side of the slide (12) forms sliding slot (11), is slidably fitted with sliding block (18) in the sliding slot (11)；The slide (12)
It is fixedly installed in inside bottom surface rack gear (14), engagement connection rack gear (15) on the rack gear (14), gear ring (15) set
On hub motor (16), the hub motor (16) is rolled by wheel shaft (17) and is mounted in the slideway (10), described
Wheel shaft (17) one end is detachably fixed with the sliding block (18) and connect；
Described sliding block (18) one end is stretched out the sliding slot (11) and is fixedly installed with rotating electric machine (19), the rotating electric machine (19)
Output shaft on be fixedly installed with cleaning bar (20), cleaning bar (20) upper end is fixedly installed with the conduction that is slidably located in
U-shaped cleaning brush (21) on detector bar (2).
2. a kind of pantograph pan wear detector according to claim 1, it is characterised in that: the push-rod electric machine
(3) quantity has multiple, and is evenly distributed on the pantograph pan (1) front and rear sides face.
3. a kind of pantograph pan wear detector according to claim 1, it is characterised in that: the conductivity detection item
(2) lower surface is fixedly installed with insulation jacking block (4)；
Wherein, the push rod cup of push-rod electric machine (3) upper end is fixedly connected with the insulation jacking block (4).
4. a kind of pantograph pan wear detector according to claim 1, it is characterised in that: the ammeter (8),
The battery (7) and the detection switch (9) are arranged in locomotive driving room.
5. a kind of pantograph pan wear detector according to claim 1, it is characterised in that: the conductivity detection item
(2) it is made of materials A；
Wherein, the pantograph pan (1) is made of material B；
Wherein, the wear-resisting property of the materials A is less than or equal to the wear-resisting property of the material B.
6. a kind of pantograph pan wear detecting method, which is characterized in that using described in claim 1-5 any one by electricity
Bend slide plate wear detector and execute following steps:
Step 1: push-rod electric machine (3) is installed on the pantograph pan (1) of locomotive roof, then pacifies conductivity detection item (2)
It is attached on the push-rod electric machine (3) and keeps conductivity detection item (2) upper surface and the upper surface of the pantograph pan (1) neat
It is flat；
Step 2: use detection conducting wire (6) by ammeter (8), the battery in conductivity detection item (2) both ends and locomotive driving room
(7) it connects with detection switch (9), is then closed the detection switch (9), observes and records the electric current on the ammeter (8)
Value A；
Step 3: locomotive driving for a period of time after, can be first when needing to detect the electric current for flowing through the ammeter (8) again
Control rotating electric machine (19) rotation drives cleaning bar (20) to be rotated upwards until U-shaped cleaning brush (21) are fastened in the conductivity detection
On item (2), then starts hub motor (16) rotation and drive gear ring (15) rotation, since the gear ring (15) and rack gear (14) are nibbled
It closes, therefore the hub motor (16) rotation can drive sliding block (18) sliding in sliding slot (11), and then drive the electric rotating
Machine (19) is slided along the sliding slot (11), moves the U-shaped cleaning brush (21) on the conductivity detection item (2), is scrubbed
The conductivity detection item (2)；
Step 4: scrubbing clean to the conductivity detection item (2), when the foreign of surface, first controls the rotating electric machine (19) and turns
It is dynamic that the U-shaped cleaning brush (21) is driven to leave the conductivity detection item (2), the detection switch (9) are then closed, observes and remembers
Record the current value B on the ammeter (8)；
Step 5: since the supply voltage of the battery (7) is certain, pass through the current value that the ammeter (8) detect
It can calculate the resistance of the conductivity detection item (2), and then can be calculated according to the material of the conductivity detection item (2) described
The cross section of conductivity detection item (2), it is clear that the cross section of the conductivity detection item (2) the current value A intact when corresponding,
And the current value B it is corresponding be the conductivity detection item (2) after abrasion cross section, and then can be according to two cross sections
Size judges the abrasion condition and the degree of wear of the conductivity detection item (2).
7. a kind of pantograph pan wear detecting method according to claim 6, it is characterised in that: led described in step 5
The cross section of electro-detection item (2) can be calculated according to resistance formula R=ρ L/S；
Wherein, R is the resistance of the conductivity detection item (2), and ρ is the resistivity of the conductivity detection item (2), and L is the conduction
The length of detector bar (2), S are the cross-sectional area of the conductivity detection item (2).
8. a kind of pantograph pan wear detecting method according to claim 6, it is characterised in that: operating procedure two, step
Rapid three and arrangement four before, if the power grid of locomotive upper end has electricity at this time, need first to control the push-rod electric machine (3) drive described in
Conductivity detection item (2) decline, makes conductivity detection item (2) upper surface not be in contact with power grid, then just can be carried out step behaviour
Make.
9. a kind of pantograph pan wear detecting method according to claim 6, it is characterised in that: U described in step 3
Type cleaning brush (21) needs periodic cleaning to safeguard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810756111.3A CN108981556B (en) | 2018-07-11 | 2018-07-11 | Pantograph slide plate abrasion detection device and detection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810756111.3A CN108981556B (en) | 2018-07-11 | 2018-07-11 | Pantograph slide plate abrasion detection device and detection method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN108981556A true CN108981556A (en) | 2018-12-11 |
| CN108981556B CN108981556B (en) | 2020-02-28 |
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ID=64536775
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810756111.3A Active CN108981556B (en) | 2018-07-11 | 2018-07-11 | Pantograph slide plate abrasion detection device and detection method thereof |
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| CN (1) | CN108981556B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109733200A (en) * | 2019-01-25 | 2019-05-10 | 重庆懿虹科技发展有限责任公司 | A kind of pantograph carbon slide installation and replacement method |
| CN114627712A (en) * | 2022-03-26 | 2022-06-14 | 大连大铁通益科技有限公司 | Subway pantograph simulation training device |
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| CN109733200B (en) * | 2019-01-25 | 2021-03-23 | 重庆懿虹科技发展有限责任公司 | Installation and replacement method for pantograph carbon slide plate |
| CN114627712A (en) * | 2022-03-26 | 2022-06-14 | 大连大铁通益科技有限公司 | Subway pantograph simulation training device |
| CN114627712B (en) * | 2022-03-26 | 2024-02-23 | 大连大铁通益科技有限公司 | Subway pantograph simulation training device |
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