CN207557429U - The test device of Morse Shi Mite relays - Google Patents
The test device of Morse Shi Mite relays Download PDFInfo
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- CN207557429U CN207557429U CN201721164899.6U CN201721164899U CN207557429U CN 207557429 U CN207557429 U CN 207557429U CN 201721164899 U CN201721164899 U CN 201721164899U CN 207557429 U CN207557429 U CN 207557429U
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Abstract
The utility model discloses a kind of test device of Morse Shi Mite relays, it includes：Current supply circuit, input terminal are connect with power supply by air switch, for the coil power supply of the Morse Shi Mite relays；DJ switch modules include DJ buttons, DJ coils, DJ relay normally closed contacts and DJ relay normally open contacts；Contact resistance and coil resistance detection major loop, it is connect with current supply circuit, it includes an ohmmeter, the power end of the ohmmeter is connect by DJ relay normally open contacts with current supply circuit, and the test lead of the ohmmeter is connect with the coil of the Morse Shi Mite relays；Contact work consistency detection circuit, the contact detection circuit comprising a plurality of parallel connection；Parallel connection a plurality of contact detection circuit after DJ buttons, DJ coils and the series connection of DJ relay normally closed contacts, the test lead of the ohmmeter connects the contact detection circuit of a plurality of parallel connection, the series circuit connection that DJ buttons, DJ coils the are formed current supply circuit.
Description
Technical field
The utility model is related to a kind of test devices of Morse Shi Mite relays.
Background technology
Dutch 400 115 EGZ Morse Shi Mite relays of BWG（Safety type relay）It is subway cab signal relay
One kind of device, have the characteristics that be widely used, failure rate it is higher, based on Shanghai Underground development trend ultra-large from now on,
It has gradually brought into schedule for the application of the on-line monitoring technique of classical signal relay.
But due to lacking suitable test device, circuit operator on duty lacks the safety type relay reliable survey at present
Trial work section, failure cause is unknown, and scrappage is high, for such case, is badly in need of making corresponding relay test-device, to pass through
Maintenance extends its service life.
Utility model content
The purpose of this utility model is to provide the test devices of a Morse Shi Mite relay, realize to Morse
The reliable detection of Shi Mite relays provides the means of testing for finding out failure cause for circuit operator on duty, and to the type relay
The maintenance of device provides may.
In order to achieve the above object, the utility model is achieved through the following technical solutions：
A kind of test device of Morse Shi Mite relays, it is characterized in that, comprising：
Power supply；
Current supply circuit, input terminal are connect with power supply by air switch, for the Morse Shi Mite
The coil power supply of relay；
DJ switch modules include DJ buttons, DJ coils, DJ relay normally closed contacts and DJ relay normally open contacts；
Contact resistance and coil resistance detection major loop, connect with current supply circuit, it includes an ohmmeter, the ohmmeter
Power end is connect by DJ relay normally open contacts with current supply circuit, the test lead of the ohmmeter and the Morse Shi Mite
The coil connection of relay；
Contact work consistency detection circuit, includes two groups of light emitting diodes；First group of light emitting diode with described mole
One group of normally-closed contact in Si Shimite relays is correspondingly connected with, second group of light emitting diode and the Morse Shi Mite relays
One group of normally opened contact in device is correspondingly connected with, to form the contact of a plurality of parallel connection detection circuit；The DJ buttons, DJ coils with
And in parallel a plurality of contact detection circuit after the series connection of DJ relay normally closed contacts, it is a plurality of that the test lead of the ohmmeter connects this
Contact detection circuit in parallel, and the series circuit that the DJ buttons, DJ coils are formed connects the current supply circuit.
The test device of above-mentioned Morse Shi Mite relays, wherein, also include：
Contact resistance and coil resistance detection subsidiary loop, include multiple contact resistance testing buttons, multiple contact resistances
Test coil, multiple contact resistances test normally opened contact, a coil resistance testing button, coil resistance test coil,
And a coil resistance test normally opened contact and a coil resistance test normally-closed contact；
Wherein, each contact resistance testing button respectively with each contact resistance test coil connect after with it is described
Current supply circuit connection；
Wherein, the test lead of the ohmmeter tests normally opened contact connection by multiple contact resistances respectively and rubs
Multiple normally opened contacts and normally-closed contact in Er Sishimite relays；
Wherein, the test lead of the ohmmeter tests normally opened contact connection mole by the coil resistance
The both ends of the coil of Si Shimite relays, the test lead of the ohmmeter are also tested often by multiple contact resistances
Open the contact detection circuit in the contact work consistency detection circuit described in contact portion；
Wherein, the coil of the Morse Shi Mite relays is tested by coil resistance described in normally-closed contact connection
Current supply circuit.
The test device of above-mentioned Morse Shi Mite relays, wherein：
The voltmeter with the coils from parallel connection of coils of the Morse Shi Mite relays is additionally provided in the current supply circuit.
The test device of above-mentioned Morse Shi Mite relays, wherein：
Be additionally provided in the current supply circuit respectively with the transformer of the coils from parallel connection of coils of the Morse Shi Mite relays,
Bridge rectifier, pressure regulator, diode.
The test device of above-mentioned Morse Shi Mite relays, wherein：
The voltmeter is MTD-4DV-94-TS types.
The test device of above-mentioned Morse Shi Mite relays, wherein：
The ohmmeter is MTD-LR-94-TS types.
The test device of above-mentioned Morse Shi Mite relays, wherein：
One stop button is set on the series circuit formed in the DJ buttons and DJ coils.
The utility model has the following advantages compared with prior art：Realize the reliable inspection to Morse Shi Mite relays
Survey, solve the technological gaps of Morse Shi Mite relay tests, there is stronger practicability and reliability, convenient for failure after
The analysis of electric appliance and data sampling, the maintenance for Morse Shi Mite relays provide possibility.
Description of the drawings
Fig. 1 is the fundamental diagram of the utility model.
Specific embodiment
Below in conjunction with attached drawing, by the way that a preferable specific embodiment is described in detail, the utility model is done and is further explained
It states.
As shown in Figure 1, the utility model discloses a kind of test device of Morse Shi Mite relays, it includes：For
Power supply 1；Current supply circuit 2, input terminal are connect with power supply 1 by air switch A1/N1, for the Morse
The coil Z power supplies of Shi Mite relays；DJ switch modules, comprising DJ buttons, DJ coils, DJ relay normally closed contacts and DJ after
Electric appliance normally opened contact；Contact resistance and coil resistance detection major loop 4, connect, it includes an ohmmeters, should with current supply circuit 2
The power end of ohmmeter is connect by DJ relay normally open contacts with current supply circuit 2, and the test lead of the ohmmeter rubs with described
The coil Z connections of Er Sishimite relays；Contact work consistency detection circuit 5, includes two groups of light emitting diodes；First group
Light emitting diode 1H ~ 4H is correspondingly connected with one group of normally-closed contact in the Morse Shi Mite relays, and second group shines two
Pole pipe 1Q ~ 4Q is correspondingly connected with one group of normally opened contact in the Morse Shi Mite relays, to form connecing for a plurality of parallel connection
Point detection circuit；Parallel connection a plurality of contact detection line after DJ buttons, DJ coils and the DJ relay normally closed contacts is connected
Road, the test lead of the ohmmeter connect the contact detection circuit of a plurality of parallel connection, and the DJ buttons, DJ coils institute structure
Into the series circuit connection current supply circuit 2.
The test device of the Morse Shi Mite relays also includes：Contact resistance and coil resistance detection assist back
Road 3 is surveyed comprising multiple contact resistance testing button 1QA ~ 8QA, multiple contact resistances test coil 1J ~ 8J, multiple contact resistances
Normally opened contact is tried, a coil resistance testing button 9QA, a coil resistance test coil 9J and a coil resistance are surveyed
Try normally opened contact and a coil resistance test normally-closed contact；Wherein, each contact resistance testing button 1QA ~ 8QA points
It is not connect with after the test coil 1J ~ 8J series connection of each contact resistance with the current supply circuit 2；Wherein, the ohmmeter
Test lead is tested multiple normal in normally opened contact connection Morse Shi Mite relays by multiple contact resistances respectively
Open contact and normally-closed contact；Wherein, the test lead of the ohmmeter is tested normally opened contact by the coil resistance and is connected
Connect the both ends of the coil Z of the Morse Shi Mite relays, the test lead of the ohmmeter is also by described multiple
Contact detection circuit in the contact resistance test normally opened contact connection contact work consistency detection circuit 5；Wherein, institute
The coil Z of Morse Shi Mite relays stated tests the normally-closed contact connection current supply circuit 2 by coil resistance.
The voltmeter in parallel with the coil Z of the Morse Shi Mite relays is additionally provided in the current supply circuit 2.
Transformation in parallel with the coil Z of the Morse Shi Mite relays respectively is additionally provided in the current supply circuit 2
Device, bridge rectifier, pressure regulator T, diode.
One stop button is set on the series circuit formed in the DJ buttons and DJ coils.
Hereinafter, with reference to a more detailed embodiment, to illustrate the operation principle of the utility model：
The current supply circuit 2 include the testing base of relay, power outlet, air switch, indicator light HD, pressure regulator T,
220V/115V transformers, bridge rectifier, voltmeter, diode.Preferably, the voltmeter is MTD-4DV-94-TS,
Accuracy is better than 0.1%.
The contact action consistency measure loop 5 includes a stop button, a DJ button, direct current 12V
DJ relays, eight LED light, that is, 1Q ~ 4Q, 1H ~ 4H.
The contact resistance and coil resistance detection major loop 4 include fuse, 24V Switching Power Supplies, 12V Switching Power Supplies,
Ohmmeter.Preferably, the ohmmeter is MTD-LR-94-TS, and accuracy is better than 0.1%.
The contact resistance and coil resistance detection subsidiary loop 3 include 9 button, that is, 1QA ~ 9QA, 9 direct current 12V after
Electric appliance, that is, 1J ~ 9J.
In current supply circuit 2, the AC220V power supplies 1 of power outlet input, the fuse carried in power outlet is protected
Shield, power supply are controlled by air switch A1/N1, are connected to the input terminal of pressure regulator, are passed through isolating transformer secondary after 0 ~ 220V of pressure regulation
0 ~ 115V of output exchange, 0 ~ 115V of direct current is exported after rectified, ensures the stabilization of each test loop power supply supply.
Power supply indicator, 12V Switching Power Supplies are controlled by air switch A1/N1, A1/N1 that is respective and being connected to power outlet
Both ends.Wherein, power supply indicator, for embodying whether the power supply of the test device connects, switch A1/N1 is lighted when being closed,
Extinguish during disconnection.24V Switching Power Supplies are also by switch A1/N1 controls, A1/N1 both ends that are respective and being connected to power outlet, wherein A1
End is connect with the normally opened contact of DJ relays, and when switch A1/N1 closures, power supply indicator is lighted, and DJ relay normally opens touch at this time
When point is in closed state, 24V Switching Power Supplies will turn on, otherwise DJ relay normally open contacts are in off-state, 24V switches
Power supply is then disconnected.
After relay to be measured is inserted into testing base, the both ends of the coil Z of relay are directly connected to bridge by electric wire
Formula rectifier is powered by air switch A1/N1 controls using the A1/N1 both ends for powering on socket as relay coil Z.
Set DJ buttons and stop button be used for control contact action consistency measure loop 5 working power break-make and
The working power of control contact resistance and coil resistance detection major loop 4 is open close, and when pressing DJ buttons, DJ relay coils obtain
Electricity, two normally-closed contacts of DJ relays disconnect, and a normally opened contact is closed, and has cut off contact action consistency measure loop at this time
5 working power has connected the working power of contact resistance and coil resistance detection major loop 4.When pressing stop button, DJ
Relay coil dead electricity, two normally-closed contacts of DJ relays are closed, and a normally opened contact disconnects, be disconnected at this time contact resistance and
Coil resistance detects the working power of major loop 4, has connected the working power of contact action consistency measure loop 5.DJ relays
Two normally-closed contacts of device are controlled by DJ buttons and stop button, are connect with eight LED light.The output of 12V Switching Power Supplies is made
The working power lighted for supply eight lamps of LED；12V power supplys fan also in parallel, plays the heat sinking function inside test device.
Wherein, four groups of normally-closed contacts of four LED light 1H ~ 4H and Morse Smith's relay are correspondingly connected with；Other four
Four groups of normally opened contacts of a LED light 1Q ~ 4Q and Morse Smith's relay are correspondingly connected with, and can make this four LED light 1Q ~ 4Q
It is distinguished with the color difference of first four LED light 1H ~ 4H with showing.When carrying out the test of contact action consistency, in Morse Smith
Relay energized and release during, four red lights of LED 1Q ~ 4Q on panel are instantaneously lighted with extinguish it is whether consistent, with
And four green lights of LED 1H ~ 4H instantaneously light with extinguish it is whether consistent, observed.
12V Switching Power Supplies connect respectively with 1QA ~ 9QA buttons and its corresponding 1J ~ 9J coils, when pressing DJ buttons, DJ
Relay coil obtains electric, and two normally-closed contacts of DJ relays disconnect, and a normally opened contact is closed, and have cut off contact action one at this time
The working power of cause property measure loop 5 has connected the working power of contact resistance and coil resistance detection major loop 4.At this time again
One or coil resistance testing button among eight contacts that need to carry out contact resistance test are pressed, 1J ~ 9J coils are pressed
That group of coil obtains electric, and corresponding four groups of normally opened contacts are closed, and circuit is connected to the above-mentioned four groups of normally-closed contacts of relay and four groups
The position that normally opened contact and respective LED light are correspondingly connected with, shown on ohmmeter at this time be contact resistance size.9QA buttons
Button is measured for coil, when 9QA buttons are closed, 9J coils obtain electric, corresponding 4 groups of normally opened contacts closure, 2 groups of normally-closed contacts
Disconnect, coil Z and ohmmeter are connected at this time, at this time ohmmeter show be coil resistance size（That is the resistance value of ohmmeter）,
It is accurate to 0.1 Ω.
Test device described in the utility model determines that switch A1/N1 is closed, is powered, electricity when carrying out contact resistance measurement
Source indicator light is lighted, and measuring resistance start button DJ is pressed, and DJ relay coils obtain electric, and two normally-closed contacts of DJ relays break
It opens, a normally opened contact is closed, and has cut off the working power of contact action consistency measure loop 5 at this time, has connected contact electricity
Resistance and the working power of coil resistance detection major loop 4.It is closed through 1QA ~ 8QA buttons, 1J ~ 8J coils obtain electric, and tetra- groups of 1J ~ 8J is normal
Contact closure is opened, any one contact resistance that connecting need to currently test is sampled, and sampled result is sent to the defeated of ohmmeter
Enter end, the resistance value size of the contact resistance can be directly read by ohmmeter.Similarly, other contact resistances are tested.
Wherein, 5QA ~ 8QA buttons are pressed, correspond to contact A1 ~ A4 respectively, record the contact resistance resistance value of four groups of contacts；It is slow
Pressure regulator knob is slowly adjusted clockwise（Knob is adjusted clockwise increases pressure regulator output voltage, and adjust makes voltage counterclockwise
Reduce）, after relay picks up completely, then 1QA ~ 4QA buttons are pressed, correspond to contact C1 ~ C4 respectively, four groups of contacts of record connect
Point resistance.
Test device described in the utility model determines pressure regulator in zero-bit when carrying out the test of contact action consistency
In the case of make switch A1/N1 closure be powered, power supply output 220V send to voltmeter.Button DJ be off-state, measuring resistance
When stop button is closed state, DJ relay coils must not be electric, therefore two normally-closed contacts of DJ relays are closed, and one normally opened tactile
Point disconnects.Button 9QA is off-state, and 9J relay coils must not be electric, therefore the 4 normally opened disconnections in contact of 9J relays, and 2 normally closed
Contact closure adjusts pressure regulator knob（Increase clockwise reduces counterclockwise）Voltage should change between 0~115V of DC, explanation
Instrument can normally work.
When pressure regulator T knobs are slowly adjusted clockwise, digital voltmeter numerical value is made slowly to increase therewith.Work as digital voltmeter
When being about shown in 47.6V, measured relay coil Z obtain it is electric pick up contact closure, four groups of corresponding C1 C2 C3 C4 contacts
Normally opened contact is connected, and lights corresponding four Light-emitting diode LED 1Q ~ LED4Q, it is instantaneous to observe these diodes at this time
Whether sequence when lighting is consistent（It is if consistent to meet the requirements）.
Make timing under voltage when pressure regulator knob is adjusted counterclockwise, digital voltmeter is about in 28.9V, relay coil
Z discharges, and four groups of contacts of corresponding C1 C2 C3 C4 contacts disconnect, and observes corresponding four LED1Q ~ LED4Q sequences when extinguishing
It is whether consistent（It is if consistent to meet the requirements）.Meanwhile four groups of normally-closed contacts of 1 A2 A3 A4 contacts of corresponding A are resetted and are connected, and are seen
Whether consistent examine instantaneous sequences of the corresponding LED1H ~ LED4H when lighting or extinguishing（It is if consistent to meet the requirements）.
Test device described in the utility model is mainly completed when carrying out voltage measurement using pressure regulator, and switch A1/N1 is closed
After conjunction, pressure regulator knob is adjusted clockwise and is magnetized up to voltage reaches maximum, corresponds to C1 C2 C3 C4 contacts at this time
Four LED1Q ~ LED4Q red lights are lighted；Pressure regulator knob is slowly adjusted counterclockwise, treats that four red lights go out entirely, 1 A2 A3 of corresponding A
After four LED1H ~ LED4H green lights of A4 contacts are lighted, the voltmeter numerical value observed is relay release voltage（Maximum is released
Electric discharge pressure）.After pressure regulator zero, pressure regulator knob is slowly adjusted clockwise to increase voltage, treats that LED1H ~ LED4H this four is green
Lamp goes out entirely, after this four red lights of LED1Q ~ LED4Q are lighted, the work picked up of voltmeter numerical value, as relay observed
Voltage（Minimum picks up voltage）.
Although the content of the utility model is discussed in detail by above preferred embodiment, but it should be appreciated that on
The description stated is not considered as the limitation to the utility model.After those skilled in the art have read the above, for
A variety of modifications and substitutions of the utility model all will be apparent.Therefore, the scope of protection of the utility model should be by appended
Claim limit.
Claims (7)
1. a kind of test device of Morse Shi Mite relays, which is characterized in that include：
Power supply（1）；
Current supply circuit（2）, input terminal and power supply（1）Pass through air switch（A1/N1）Connection, for mole
The coil of Si Shimite relays（Z）Power supply；
DJ switch modules include DJ buttons, DJ coils, DJ relay normally closed contacts and DJ relay normally open contacts；
Contact resistance and coil resistance detection major loop（4）, with current supply circuit（2）Connection, it includes an ohmmeter, the ohmmeters
Power end pass through DJ relay normally open contacts and current supply circuit（2）Connection, the test lead of the ohmmeter and the Morse
The coil of Shi Mite relays（Z）Connection；
Contact work consistency detection circuit（5）, include two groups of light emitting diodes；First group of light emitting diode（1H~4H）With institute
The one group of normally-closed contact stated in Morse Shi Mite relays is correspondingly connected with, second group of light emitting diode（1Q~4Q）It rubs with described
One group of normally opened contact in Er Sishimite relays is correspondingly connected with, to form the contact of a plurality of parallel connection detection circuit；Described
Parallel connection a plurality of contact detection circuit after DJ buttons, DJ coils and the series connection of DJ relay normally closed contacts, the ohmmeter
Test lead connects the contact detection circuit of a plurality of parallel connection, and the series circuit connection that the DJ buttons, DJ coils are formed
The current supply circuit（2）.
2. the test device of Morse Shi Mite relays as described in claim 1, which is characterized in that also include：
Contact resistance and coil resistance detection subsidiary loop（3）, include multiple contact resistance testing buttons（1QA~8QA）, it is multiple
Contact resistance tests coil（1J~8J）, multiple contact resistances test normally opened contact, a coil resistance testing button（9QA）, one
A coil resistance tests coil（9J）And a coil resistance test normally opened contact and a coil resistance test normally closed touch
Point；
Wherein, each contact resistance testing button（1QA~8QA）Respectively coil is tested with each contact resistance（1J~8J）
After series connection with the current supply circuit（2）Connection；
Wherein, the test lead of the ohmmeter tests normally opened contact by multiple contact resistances respectively and connects Morse
Multiple normally opened contacts and normally-closed contact in Shi Mite relays；
Wherein, the test lead of the ohmmeter tests the normally opened contact connection Morse history by the coil resistance
The coil of close spy's relay（Z）Both ends, the test lead of the ohmmeter is also tested normal by multiple contact resistances
Open the contact work consistency detection circuit described in contact portion（5）In contact detection circuit；
Wherein, the coil of the Morse Shi Mite relays（Z）It is tested described in normally-closed contact connection by coil resistance
Current supply circuit（2）.
3. the test device of Morse Shi Mite relays as described in claim 1, it is characterised in that：
The current supply circuit（2）In be additionally provided with coil with the Morse Shi Mite relays（Z）Voltmeter in parallel.
4. the test device of the Morse Shi Mite relays as described in claim 1 or 3, it is characterised in that：
The current supply circuit（2）In be additionally provided with the coil with the Morse Shi Mite relays respectively（Z）Transformation in parallel
Device, bridge rectifier, pressure regulator（T）, diode.
5. the test device of Morse Shi Mite relays as claimed in claim 3, it is characterised in that：
The voltmeter is MTD-4DV-94-TS types.
6. the test device of Morse Shi Mite relays as described in claim 1, it is characterised in that：
The ohmmeter is MTD-LR-94-TS types.
7. the test device of Morse Shi Mite relays as described in claim 1, it is characterised in that：
One stop button is set on the series circuit formed in the DJ buttons and DJ coils.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721164899.6U CN207557429U (en) | 2017-09-12 | 2017-09-12 | The test device of Morse Shi Mite relays |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721164899.6U CN207557429U (en) | 2017-09-12 | 2017-09-12 | The test device of Morse Shi Mite relays |
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| Publication Number | Publication Date |
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| CN207557429U true CN207557429U (en) | 2018-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721164899.6U Active CN207557429U (en) | 2017-09-12 | 2017-09-12 | The test device of Morse Shi Mite relays |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108646177A (en) * | 2018-07-12 | 2018-10-12 | 中铁磁浮科技（成都）有限公司 | A kind of magnetic-levitation train electrical cubicle test device |
| CN109696625A (en) * | 2019-02-27 | 2019-04-30 | 上海地铁维护保障有限公司 | Portable relay test-device and test method |
| CN111289893A (en) * | 2020-04-15 | 2020-06-16 | 上海地铁维护保障有限公司通号分公司 | Relay auxiliary test platform and method |
| CN111596186A (en) * | 2020-06-24 | 2020-08-28 | 四川九洲线缆有限责任公司 | Cable detection tool |
| TWI704363B (en) * | 2018-09-04 | 2020-09-11 | 凱文馬克 柯蒂斯 | Self-configuring relay tester |
| CN113049949A (en) * | 2021-02-01 | 2021-06-29 | 上海地铁维护保障有限公司 | Relay overhaul testing device and system |
| CN113671939A (en) * | 2021-08-27 | 2021-11-19 | 上海地铁维护保障有限公司 | Testing device for vehicle-mounted traction brake fault control board |
-
2017
- 2017-09-12 CN CN201721164899.6U patent/CN207557429U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108646177A (en) * | 2018-07-12 | 2018-10-12 | 中铁磁浮科技（成都）有限公司 | A kind of magnetic-levitation train electrical cubicle test device |
| TWI704363B (en) * | 2018-09-04 | 2020-09-11 | 凱文馬克 柯蒂斯 | Self-configuring relay tester |
| CN109696625A (en) * | 2019-02-27 | 2019-04-30 | 上海地铁维护保障有限公司 | Portable relay test-device and test method |
| CN111289893A (en) * | 2020-04-15 | 2020-06-16 | 上海地铁维护保障有限公司通号分公司 | Relay auxiliary test platform and method |
| CN111596186A (en) * | 2020-06-24 | 2020-08-28 | 四川九洲线缆有限责任公司 | Cable detection tool |
| CN113049949A (en) * | 2021-02-01 | 2021-06-29 | 上海地铁维护保障有限公司 | Relay overhaul testing device and system |
| CN113671939A (en) * | 2021-08-27 | 2021-11-19 | 上海地铁维护保障有限公司 | Testing device for vehicle-mounted traction brake fault control board |
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