CN217931791U - Motor train unit train line testing device - Google Patents
Motor train unit train line testing device Download PDFInfo
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- CN217931791U CN217931791U CN202221927336.9U CN202221927336U CN217931791U CN 217931791 U CN217931791 U CN 217931791U CN 202221927336 U CN202221927336 U CN 202221927336U CN 217931791 U CN217931791 U CN 217931791U
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Abstract
The utility model provides a EMUs train line testing arrangement, include: the integrated cable, the shell and the mode switching module are positioned in the shell; the shell is provided with a test panel and an integrated interface; one end of the integrated cable is used for connecting a train line interface, the other end of the integrated cable is connected with the integrated interface, the integrated interface is connected to the mode switching module, and the mode switching module is connected to the test panel; the test panel is provided with a plurality of test terminals, and each test terminal is connected to a corresponding train line sequentially through the mode switching module, the integrated interface and the integrated cable; the test terminal is used for testing each train line, and the mode switching module is used for changing the combination relation among the train lines so as to switch the test mode of the test device for the train lines of the motor train unit, wherein the test mode comprises a voltage test mode, a resistance conduction test mode and an insulation and voltage resistance test mode. The utility model discloses can be more convenient, safer, test the train line of EMUs train more high-efficiently.
Description
Technical Field
The utility model belongs to the technical field of rail train, more specifically say, relate to a EMUs train line testing arrangement.
Background
The train of the motor train unit transmits signals for controlling traction, braking, safety loops and the like of the train to the connected train through a hard line of the train line, and the train line usually penetrates through the whole train through the hard line. When the electric debugging, the circuit conduction and the voltage insulation and withstand test of the bicycle are carried out, the train line of the bicycle needs to be tested, and the voltage measurement and the resistance measurement of the train line by using the universal meter and the voltage insulation and withstand test of a high-voltage withstand voltage machine are carried out.
However, the train line runs through whole vehicle, distributes in the connector at vehicle both ends, because the connector adds and is equipped with the elasticity protection apron, need alone to open the elasticity protection apron when measuring voltage to support the elasticity apron hard for a long time, another operator just can utilize the universal meter to accomplish voltage and resistance measurement, has increased the cost of labor, still takes place the extrusion danger easily. When voltage measurement is carried out on connector plug pins in corresponding train lines through a multimeter, contact pins of the pins to be measured are dense, the number defined by the pins is small and cannot be distinguished easily, voltage and resistance measurement is very difficult, and measurement time is long. If two meter pens are too close, short-circuit faults are easily caused, and personal and equipment safety is seriously influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a EMUs train line testing arrangement aims at more conveniently, safer, test the train line of EMUs train more high-efficiently.
In order to achieve the purpose, the utility model adopts the technical proposal that: the utility model provides a EMUs train line testing arrangement, includes:
the integrated cable, the shell and the mode switching module are positioned in the shell;
the shell is provided with a test panel and an integrated interface;
one end of the integrated cable is used for connecting a train line interface, the other end of the integrated cable is connected with the integrated interface, the integrated interface is connected to the mode switching module, and the mode switching module is connected to the test panel; the test panel is provided with a plurality of test terminals, and each test terminal is connected to a corresponding train line sequentially through the mode switching module, the integrated interface and the integrated cable;
the test terminal is used for testing each train line, and the mode switching module is used for changing the combination relation among the train lines so as to switch the test modes of the test device for the train lines of the motor train unit, wherein the test modes comprise a voltage test mode, a resistance conduction test mode and an insulation and voltage resistance test mode.
Optionally, the number of the integrated interfaces is two, and train lines connected with the two integrated interfaces are not completely the same; one end of the integrated cable is used for connecting a train line interface, and the other end of the integrated cable is connected with any integrated interface.
Optionally, each integrated interface has 20 connecting pins, and the test panel is provided with 30 test terminals.
Optionally, the test panel is further provided with a plurality of indicator lights corresponding to the positions of the test terminals one to one; the indicator light is connected with the corresponding test terminal for indicating the communication state of the test terminal and the corresponding train line.
Optionally, the testing device for the train line of the motor train unit further comprises:
the light testing module is positioned in the shell;
the light test module is connected with each indicator light and used for detecting whether each indicator light is normal or not.
Optionally, the housing is further provided with a display module, and the display module is connected with the mode switching module;
the display module is used for displaying a test mode of the motor train unit train line test device.
Optionally, the testing device for the train line of the motor train unit further comprises:
the power supply module is positioned in the shell;
the test panel is also provided with a plurality of test switches which are in one-to-one correspondence with the positions of the test terminals; the power module is connected to each test terminal through each test switch, and the power module is used for supplying power for the train line that corresponds through the test terminal when test switch opens.
Optionally, the power module is further connected with the display module;
the power module is also connected with each indicator light through the light testing module.
Optionally, the testing device for the train line of the motor train unit further comprises:
a circuit protection module;
the circuit protection module is positioned in the shell and connected to the output end of the power supply module.
Optionally, a dust cover plate is arranged at the integrated interface, and an anti-slip patch is further arranged on the shell.
Compared with the prior art, the utility model the beneficial effect who exists is:
the utility model connects the integrated cable with the train line interface, thus avoiding the need of manually opening the elastic protective cover plate for a long time; the train line is led to the test panel for testing, so that the problems that contact pins of the measuring pins are dense, the number of the pin definition is small and difficult to distinguish, and voltage and resistance measurement is very difficult are solved; and the mode switching module can also change the test mode, thereby further improving the test accuracy. The utility model discloses can be more convenient, safer, test the train line of EMUs train more high-efficiently.
Drawings
Fig. 1 is a schematic diagram of a conventional voltage testing scheme provided by an embodiment of the present invention;
fig. 2 is a schematic diagram of a conventional resistance on-state testing scheme provided by an embodiment of the present invention;
fig. 3 is a schematic diagram of a conventional dielectric withstand voltage testing scheme provided by an embodiment of the present invention;
fig. 4 is a schematic front view of the testing device for the train line of the motor train unit provided by the embodiment of the invention;
fig. 5 is a schematic side view of a train line testing device of a motor train unit provided by an embodiment of the present invention;
fig. 6 is a schematic back view of a train line testing device of a motor train unit provided by an embodiment of the present invention;
fig. 7 is a schematic view of an integrated cable according to an embodiment of the present invention.
Detailed Description
In order to make the technical problem, technical solution and beneficial effects to be solved by the present invention more clearly understood, the following description is made in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The conventional voltage, resistance on, and dielectric breakdown test will be described in detail below.
Referring to fig. 1, during voltage testing, a voltage tester 2 opens a train line interface cover plate, and needs to open the cover plate for a long time in a voltage testing stage to prevent the cover plate from resetting. The person 1 utilizes a red meter pen and a black meter pen of the multimeter to carry out voltage test on pins corresponding to the connectors of the cover plate opened by the person 2.
Referring to fig. 2, during the resistance conduction test, a tester 2 opens the train end interface cover plate, and needs to open the cover plate for a long time in the resistance conduction test stage to prevent the cover plate from resetting. Personnel 1 utilizes the red pen-shape metre one end of universal meter to connect personnel 2 and opens on the stitch that the connector of apron corresponds, and the automobile body is connected to one end and the on-resistance test is carried out. The other end of the connector also needs a person 3 to open the train end train line interface cover plate, and the cover plate needs to be opened for a long time in the resistance conduction testing stage, so that the cover plate is prevented from being reset. The person 4 is connected with the person 3 by one end of the wire and opens the stitch corresponding to the connector of the cover plate, and one end of the wire is connected with the vehicle body.
Referring to fig. 3, during a pressure test, one end of each train line needs to be suspended, the other end of each train line needs to be connected with a pressure-resistant machine, a line at one end of the pressure-resistant machine is connected with a train line interface, an elastic protective cover plate needs to be opened, because high-voltage needs to be applied to the train lines, the elastic protective cover plate cannot be opened manually at this time, a pressure-resistant tester 1 needs to open the train line interface cover plate at the train end first, and then the cover plate is trapped by a rolling belt to prevent the cover plate from resetting. The personnel 1 utilize the wire to be connected the withstand voltage machine output voltage with the stitch that the train line interface of opening the apron corresponds, and after connecting, personnel 1 operates the withstand voltage machine and carries out the withstand voltage test.
The prior art solution has the following drawbacks:
(1) According to the technical scheme, voltage measurement and resistance conduction measurement of pins in the train line connector of the vehicle can be completed only by two persons in cooperation, and the manual production cost is increased.
(2) When the existing voltage is measured, because pins in the train line connector of the vehicle are dense, short-circuit faults are easy to occur during measurement, and secondary electric accidents are caused.
(3) Prior art need support for a long time when the artifical train line connector elastic cover plate of opening of vehicle, if personnel carelessly slightly, cause elastic cover plate to drop, elastic cover plate is resetting, gives the extrusion with tester's hand easily, causes mechanical injury.
(4) When an insulation and voltage withstand test is carried out in the prior art, when the elastic cover plate is pulled open by utilizing a rolling belt for a long time, the elastic cover plate is easy to deform, the tightness between the elastic cover plate and the connector is caused, and the quality hidden trouble of water inflow of the connector is caused in the running process of a vehicle. And because the connector pin in the train line of vehicle exposes, when carrying out the withstand voltage test, easily cause personnel's electric shock accident.
The utility model discloses a technical scheme provide a EMUs train line testing arrangement, please refer to as shown in fig. 4-7 together, the device includes: a device body as shown in fig. 4-6 and an integrated cable as shown in fig. 7. The device body includes a housing and a mode switching module located within the housing.
The housing includes an upper housing 2 and a lower housing 13.
The shell is provided with a test panel and an integrated interface. As a possible implementation, the number of the integrated interfaces is two, i.e. 1 and 6 in the figure, and the train lines connected by the two integrated interfaces are not identical. One end of the integrated cable is used for connecting a train line interface, and the other end of the integrated cable is connected with any integrated interface. Since the train line interface has two forms, this embodiment provides two integrated interfaces for matching.
Referring to fig. 7, the structure of the integrated cable includes a connector 18, a cable 19, a vehicle-end connector 20, and a vehicle-end connector female pin 21. The connector 18 is used for being connected with the integrated interface 1 or the integrated interface 6 of the train line detection device main body, is an external connection channel of the train line detection device main body, and has pins of gold-plated male needles 20. After being connected with the train line detection device connector (integrated interface) 1 or 6, the train line detection device connector is fastened with a buckle, and the connector is connected and fastened to prevent falling off. The cable 19 is a common connection cable and provides a circuit path for the entire train line detection device. Vehicle end connector 20 is connected with the vehicle end, is connected vehicle end connector and the public needle connector of vehicle end when using, and the back is opened to vehicle end connector apron, with vehicle end connector connection back, the apron is fixed with this vehicle end connector and is prevented to drop. The vehicle-side connector female needle communicates the signal of the vehicle train line detection device with a vehicle-side train line to form a circuit path.
The integrated interfaces 1 and 6 are connected to a mode switching module inside the housing, which is connected to the test panel. The test panel is provided with a plurality of test terminals 4, and each test terminal 4 is connected to a corresponding train line sequentially through the mode switching module, the integrated interface and the integrated cable.
In the present embodiment, the number of the test terminals is 30, 20 test terminals are connected to the integration interface 1, 20 test terminals are connected to the integration interface 6, and the test terminals connected to the two integration interfaces are overlapped.
And marks are written at the positions of the test terminals and are used for testing each train line. The mode switching module is used for changing the combination relation among the train lines so as to switch the test modes of the test device for the train lines of the motor train unit, and the test modes comprise a voltage test mode, a resistance conduction test mode and an insulation and voltage resistance test mode. For example, in the case of a resistance conduction test, the mode switching module may internally combine the train lines into one line through the switch. A mode rotation switch may be provided on the test panel to enable selection of different operating modes.
The utility model is connected with the train line interface through the integrated cable, so that the elastic protective cover plate does not need to be manually opened for a long time; the train line is led to the test panel for testing, so that the problems that contact pins of the measuring pins are dense, the number of the pin definition is small and difficult to distinguish, and voltage and resistance measurement is very difficult are solved; and the mode switching module can also change the test mode, thereby further improving the test accuracy. The utility model discloses can more make things convenient for, safer, test the train line of EMUs train more high-efficiently.
As a possible implementation manner, a plurality of indicator lamps 3 corresponding to the positions of the test terminals 4 one by one are further arranged on the test panel. The indicator lamp 3 is connected with the corresponding test terminal 4 and is used for indicating the communication state of the test terminal 4 and the corresponding train line.
In this embodiment, the indicator light 3 may be a red light emitting diode, has the characteristics of high brightness, low power consumption, high reliability and long service life, and is used for displaying the state of the corresponding channel, and when the channel display is normal, the red light emitting diode is turned on. After the train line, the test terminal 4 and the indicator lamp 3 are communicated, the train line supplies power to the indicator lamp 3, and the indicator lamp 3 is lightened to indicate that the test terminal 4 is communicated with the corresponding train line.
As a possible implementation manner, the testing device for train line of motor train unit further comprises:
the light test module is positioned in the shell.
The light testing module is connected with each indicator light 3 and used for detecting whether each indicator light 3 is normal or not.
In this embodiment, a power switch 7, a power indicator light 8, a test light indicator light 9 and a test light switch 10 are further disposed on the test panel. After power switch 7 is pressed, power indicator 8 lights, and after light test switch 10 is pressed, all LED indicator lights are all lighted, whether there is the pilot lamp to damage through light test module check out test set before the use, get rid of this equipment when using, because the trouble of equipment itself causes input signal to show unusually. The test lamp module is interlocked with the vehicle train line detection circuit relay, so that the condition that all LED indicating lamps are lightened to influence a test result after a test lamp switch is pressed down by manual misoperation in the process of train line detection is prevented.
As a possible implementation mode, the shell is further provided with a display module 12, and the display module 12 is connected with the mode switching module and used for displaying a test mode of the motor train unit train line test device.
In this embodiment, the display module 12 is an LCD display screen for displaying the working mode of the train line detection device, and may also be designed to display test information such as test resistance and voltage value and the device status.
As a possible implementation manner, the testing device for train line of motor train unit further comprises:
and the power module is positioned in the shell.
The test panel is also provided with a plurality of test switches 5 which are in one-to-one correspondence with the positions of the test terminals 4; the power module is connected to each test terminal 4 through each test switch 5, and the power module is used for supplying power for the corresponding train line through test terminal 4 when test switch 5 is opened.
In this embodiment, the train line generally supplies power through the train at the other end, and when necessary, the train line can also supply power through the train line power supply device, so that whether the train functions are normal or not is detected. The test switches 5 are metal button switches, and have two gears, and each channel corresponds to one test switch 5, and the total number is 30.
As a possible implementation, the power supply module is also connected to the display module 12.
As a possible implementation, the power module is further connected to each indicator light 3 through a light test module.
In this embodiment, the power module is further configured to supply power to each indicator light 3 during light test.
As a possible implementation manner, the testing device for train line of motor train unit further comprises:
and a circuit protection module.
The circuit protection module is positioned in the shell and connected to the output end of the power supply module.
In this embodiment, the circuit protection module is a voltage current limiting protection circuit, which prevents overvoltage or overcurrent during the test of the train line detection device and protects the internal detection circuit of the train line detection device.
As a possible implementation, a dust cover 14 and a fastening buckle 16 are provided at the integration interface.
In this embodiment, the dust-proof cover plate 14 is made of metal and is used for fastening and fastening the connector, and when the connector is not electrically connected to the outside, the dust-proof cover of the connector will play a role of dust-proof and water-proof. The fastening buckle 16 is made of metal and used for fixing the connector and the dust-proof cover plate. And 15 is a female pin at the integration interface.
As a possible realization, a non-slip patch 17 is also provided on the housing.
The anti-slip patch 17 can prevent the train line detection device from slipping on the ground, and plays roles of supporting, fixing and anti-slip. The number of the slip prevention patches 17 is 4.
As a possible implementation mode, the material of the test terminal 4 is metal copper, so that the test terminal is corrosion-resistant, high in conductivity, high in current transmission efficiency, detachable, convenient and quick to install, and safe and reliable in electrical connection. The polarity and voltage value of the voltage are measured by the voltage detecting device, and external testing equipment is conveniently connected.
As a possible implementation mode, the shell can be made of ABS plastic, the weight is light, the disassembly and the assembly are convenient, the hole opening is convenient and quick, the waterproof effect is achieved, and an internal circuit is protected from being polluted by water and dust. The interior of the shell is of a cavity structure, and a power supply button of the train line detection device, a light test button in a light test circuit, a test terminal, a display screen, a red LED, a mode selection switch and other devices are arranged on the shell.
For example, the process of testing by using the train line detection device of the present embodiment is as follows:
voltage testing
(1) And (4) checking that the train line detection device has good appearance and no mark on the corresponding channel is lost, switching on a power supply, starting up the train line detection device, and lighting a corresponding power supply indicator lamp.
(2) After a test lamp button is pressed down, all 30 LED indicating lamps on the train line detection device are turned on, the device is represented to be normal and reliable in function, and voltage detection of a train line can be carried out.
(3) The elastic cover plate of the train line connector socket is manually opened, then the input connector of the train line detection device is connected with the train line connector socket, after the connection is firm and reliable, the input connector of the train line detection device is electrically connected with the train line connector socket, and the train line signal is input into the train line detection device. The elastic cover plate of the train line connector socket is manually loosened, and the elastic cover plate is contacted with the fixing device of the train line detection device under the action of the fixing device, so that the input connector of the train line detection device is prevented from falling off.
(4) After the mode switch is selected in the train line voltage test mode, the train line voltage test mode is entered by the train line detection device for checking vehicles.
(5) And finding the LED indicating lamp on the corresponding train line, and checking whether the corresponding LED indicating lamp is lighted or not, if the LED indicating lamp is not lighted, judging that the train line is not communicated. If the LED indicating lamp is lightened, the normal train line of the train line can be judged.
(6) In order to detect the voltage of the train line, a multimeter needle is inserted into a corresponding voltage test terminal of a train line channel and a black pen is inserted into a negative test terminal of a train line power supply to carry out power supply test, the voltage is within a specified range, and the test of the voltage of the train line is successful.
Resistance conduction test
(1) And (4) checking that the train line detection device has good appearance and no mark on the corresponding channel is lost, switching on a power supply, starting up the train line detection device, and lighting a corresponding power supply indicator lamp.
(2) After a test lamp button is pressed down, all 30 LED indicating lamps on the train line detection device are turned on, the device is represented to be normal and reliable in function, and voltage detection of a train line can be carried out.
(3) The elastic cover plate of the train line connector socket is manually opened, then the input connector of the train line detection device is connected with the train line connector socket, after the connection is firm and reliable, the input connector of the train line detection device is electrically connected with the train line connector socket, and the train line signal is input into the train line detection device. The elastic cover plate of the train line connector socket is manually loosened, and the elastic cover plate is contacted with the fixing device of the train line detection device under the action of the fixing device, so that the input connector of the train line detection device is prevented from falling off.
(4) And after the mode switch is selected in the train line resistance conduction test mode, the train line detection device for the vehicle is checked to enter the train line resistance test mode.
(6) In order to detect the resistance of the train line, a universal meter pin is inserted into a corresponding train line channel test terminal, a black pen is inserted into a terminal of a train line public ground wire to test the resistance, the measured resistance value is within a specified resistance range, and the train line test resistance conduction test is successful.
Dielectric withstand voltage test
(1) And (4) checking that the train line detection device has good appearance and no mark on the corresponding channel is lost, switching on a power supply, starting up the train line detection device, and lighting a corresponding power supply indicator lamp.
(2) After the test lamp button is pressed down, the 30 LED indicating lamps on the train line detection device are all lightened, the device has normal and reliable functions, and voltage detection of the train line can be carried out.
(3) The elastic cover plate of the train line connector socket is manually opened, then the input connector of the train line detection device is connected with the train line connector socket, after the connection is firm and reliable, the input connector of the train line detection device is electrically connected with the train line connector socket, and the train line signal is input into the train line detection device. The elastic cover plate of the train line connector socket is manually loosened, and the elastic cover plate is contacted with the fixing device of the train line detection device under the action of the fixing device, so that the input connector of the train line detection device is prevented from falling off.
(4) After the mode switch is selected in the train line insulation voltage-withstand mode, the train line detection device for the vehicle is checked to enter a train line insulation voltage-withstand test mode.
(5) In order to carry out the train line insulation voltage-withstand test, a test cable output by a voltage-withstand machine is connected to a train line detection terminal corresponding to the train line detection device, an electrical connection path is established between the voltage-withstand machine and a train line of the train, and the train line of the train is subjected to the insulation voltage-withstand test.
The utility model discloses mainly have following advantage:
(1) The test can be completed by only 1 person, so that the manual production cost is reduced, and the production efficiency is improved.
(2) The special device for detecting the train line of the vehicle is provided for detecting the train line of the vehicle, the processing difficulty of an operator is reduced, the operation of workers is facilitated, the secondary short-circuit fault caused by the fact that no special device is arranged when the voltage of the train line of the vehicle is tested is reduced, and the injury to the operator is reduced.
(3) After the train line detection device is adopted, when the train line connector is subjected to an insulation and voltage resistance test, the quality hidden danger of connector water inflow caused by deformation of the elastic cover plate of the connector and the running process of a vehicle is reduced.
(4) After the train line detection device is adopted, the connector pins in the train line are reduced to be exposed, so that the electric shock accidents of personnel are easily caused when an insulation and voltage resistance test is carried out.
(5) After the train line detection device is adopted, when the train line connector elastic cover plate of the train is manually opened, the elastic cover plate is prevented from resetting, and the safety accident that the hands of testers are extruded is caused.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a EMUs train line testing arrangement which characterized in that includes:
the cable switching device comprises an integrated cable, a shell and a mode switching module positioned in the shell;
the shell is provided with a test panel and an integrated interface;
one end of the integrated cable is used for connecting a train line interface, the other end of the integrated cable is connected with the integrated interface, the integrated interface is connected to the mode switching module, and the mode switching module is connected to the test panel; the test panel is provided with a plurality of test terminals, and each test terminal is connected to a corresponding train line sequentially through the mode switching module, the integrated interface and the integrated cable;
the test terminal is used for testing each train line, the mode switching module is used for changing the combination relation among the train lines so as to switch the test modes of the test device for the train lines of the motor train unit, and the test modes comprise a voltage test mode, a resistance conduction test mode and an insulation and voltage resistance test mode.
2. The test device for the train line of the motor train unit according to claim 1, wherein the number of the integrated interfaces is two, and the train lines connected with the two integrated interfaces are not identical; one end of the integrated cable is used for connecting a train line interface, and the other end of the integrated cable is connected with any integrated interface.
3. The device for testing the trainline of the motor train unit according to claim 2, wherein each integrated interface has 20 connecting pins, and the test panel is provided with 30 test terminals.
4. The test device for the train line of the motor train unit according to claim 1, wherein a plurality of indicator lamps corresponding to the positions of the test terminals one by one are further arranged on the test panel; the indicator light is connected with the corresponding test terminal and used for indicating the communication state of the test terminal and the corresponding train line.
5. The motor train unit train line testing device of claim 4, further comprising:
a light test module located within the housing;
the light test module is connected with each indicator light and used for detecting whether each indicator light is normal or not.
6. The device for testing the train line of the motor train unit according to claim 5, wherein a display module is further arranged on the shell and connected with the mode switching module;
the display module is used for displaying the test mode of the motor train unit train line test device.
7. The motor train unit train line testing device of claim 6, further comprising:
a power module located within the housing;
the test panel is also provided with a plurality of test switches which are in one-to-one correspondence with the positions of the test terminals; the power module is connected to each test terminal through each test switch, the power module is used for supplying power for the corresponding train line through the test terminal when the test switch is opened.
8. The device for testing the trainline of the motor train unit according to claim 7, wherein the power module is further connected with the display module;
the power module is also connected with each indicator light through the light testing module.
9. The multiple unit train line testing device of claim 8, further comprising:
a circuit protection module;
the circuit protection module is located in the shell and connected to the output end of the power supply module.
10. The multiple unit train line testing device according to any one of claims 1-9, wherein a dust cover plate is disposed at the integration interface, and an anti-slip patch is further disposed on the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221927336.9U CN217931791U (en) | 2022-07-25 | 2022-07-25 | Motor train unit train line testing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221927336.9U CN217931791U (en) | 2022-07-25 | 2022-07-25 | Motor train unit train line testing device |
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| Publication Number | Publication Date |
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| CN217931791U true CN217931791U (en) | 2022-11-29 |
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| CN202221927336.9U Active CN217931791U (en) | 2022-07-25 | 2022-07-25 | Motor train unit train line testing device |
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- 2022-07-25 CN CN202221927336.9U patent/CN217931791U/en active Active
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