CN115979490A - Coupler longitudinal force monitoring system and method and railway wagon - Google Patents
Coupler longitudinal force monitoring system and method and railway wagon Download PDFInfo
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- CN115979490A CN115979490A CN202310073288.4A CN202310073288A CN115979490A CN 115979490 A CN115979490 A CN 115979490A CN 202310073288 A CN202310073288 A CN 202310073288A CN 115979490 A CN115979490 A CN 115979490A
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Abstract
The invention discloses a coupler longitudinal force monitoring system, a coupler longitudinal force monitoring method and a railway wagon, and relates to the technical field of railway wagons, wherein the monitoring system comprises: the device comprises a longitudinal force detection device, a coupler buffer device and a coupler buffer device, wherein the longitudinal force detection device is used for acquiring longitudinal force data of the coupler; the data processing device is connected with the longitudinal force detection device; the data transmission device is connected with the data processing device, and the data processing device and the data transmission device are connected with the coupler buffer device; and the data processing device receives the longitudinal force data detected by the longitudinal force detection device, transmits the longitudinal force data to the terminal device through the data transmission device for display, and sends an abnormal prompt when the longitudinal force data exceeds a preset threshold value. The method and the device can detect the longitudinal force data of the car coupler in real time, intelligently monitor the running state of the car and improve the running safety of the railway freight car.
Description
Technical Field
The invention relates to the technical field of railway wagons, in particular to a coupler longitudinal force monitoring system and method and a railway wagon.
Background
With the increase of the load of the Chinese railway freight car and the quantity of the marshalling of the trains, the phenomena of large longitudinal impact, difficult operation and the like occur in the running process of the trains. Longitudinal shocks are mainly due to longitudinal forces in the rail car, car traction and braking, which are mainly transmitted and damped by the coupler draft gear. The longitudinal force is transmitted along the connecting direction of the front coupler and the rear coupler of the vehicle: the coupler bears longitudinal force, namely traction force, in a pulling state; the coupler is under the compression state and bears the longitudinal force, namely the compression force.
At present, the railway freight car train longitudinal force detection at home and abroad is mainly realized by attaching a strain sensor on the surface of a hook body, namely, a force measuring coupler is adopted to detect the train longitudinal force, and the train longitudinal force is detected by measuring the strain of the hook body. The force-measuring coupler is arranged on a section with large longitudinal impact in a railway wagon train, so that the longitudinal force monitoring of the coupler of the test train is realized. A protective strain sensor is additionally arranged on the hook body to detect longitudinal force on the domestic motor train unit.
In order to ensure the accuracy and the service life of the strain gauge of the force measuring car coupler, the force measuring car coupler for detecting the longitudinal force of the train needs to select a coupler body with a smooth coupler body and no obvious defects, and simultaneously needs to adopt the strain gauge with long service life and a better packaging process. The sensor is easy to be limited by the structure to affect the safety and the service life of the sensor, and the force measuring car coupler can not be arranged on each car and only is arranged on a part of the section of a special test car group.
Disclosure of Invention
The invention aims to provide a coupler longitudinal force monitoring system and method and a railway wagon, which are used for intelligently monitoring longitudinal force data of the railway wagon and ensuring the safe operation of the railway wagon.
In order to solve the technical problems, the invention adopts the following technical scheme:
a first aspect of an embodiment of the present invention provides a coupler longitudinal force monitoring system, where the monitoring system includes: the device comprises a longitudinal force detection device, a coupler buffer device and a coupler buffer device, wherein the longitudinal force detection device is used for acquiring longitudinal force data of the coupler; the data processing device is connected with the longitudinal force detection device; the data transmission device is connected with the data processing device, and the data processing device and the data transmission device are connected with a coupler buffer device; and the data processing device receives the longitudinal force data detected by the longitudinal force detection device, transmits the longitudinal force data to the terminal device through the data transmission device for display, and sends an abnormal prompt when the longitudinal force data exceeds a preset threshold value.
In some embodiments, the longitudinal force detection device comprises: the traction force sensor is used for acquiring longitudinal force data borne by the vehicle in a traction state; and the compression force sensor is used for acquiring longitudinal force data borne by the vehicle in a compressed state.
In some embodiments, the traction force sensor is connected with a first amplifier, the compression force sensor is connected with a second amplifier, and the first amplifier and the second amplifier respectively amplify and output longitudinal force data collected by the traction force sensor and the compression force sensor.
In some embodiments, the data processing device comprises a data processing module and a power module, an output of the power module supplying power to the longitudinal force detection device, the data transmission device and the data processing module.
In some embodiments, the monitoring system further includes a self-generating device and a battery, the input end of the power module is respectively connected to the self-generating device and the battery, when the self-generating device is operated, the self-generating device supplies power to the power module and the battery, and when the self-generating device is not operated, the battery supplies power to the power module.
In some embodiments, the data transmission device includes a storage module for storing the longitudinal force data and a wireless module connected to the storage module, and the wireless module transmits the longitudinal force data in the storage module to the terminal device.
In some embodiments, the wireless module interacts with the terminal device via wireless communication, which may include LoRa wireless communication and/or GPRS communication technology and/or satellite system.
In some embodiments, the data processing device and the data transmission device are integrated and packaged as a single unit.
In some embodiments, the monitoring system further comprises an identification module for locating all vehicles and locating each compartment of the vehicle, and when the longitudinal force data is abnormal, the terminal device locates the abnormal vehicle and locates the abnormal compartment of the abnormal vehicle through the identification module.
In some embodiments, the terminal device comprises a vehicle and/or locomotive and/or a ground data platform and/or a handheld mobile device.
A second aspect of the embodiment of the present invention provides a coupler longitudinal force monitoring method, where the monitoring method includes: the longitudinal force detection device collects longitudinal force data of the car coupler and transmits the longitudinal force data to the data processing device; the data processing device processes the longitudinal force data transmitted by the longitudinal force detection device and stores the longitudinal force data to the data transmission device; the data transmission device receives the longitudinal force data stored by the data processing device and sends the longitudinal force data to the terminal device.
In some embodiments, after the data transmission device receives the longitudinal force data stored by the data processing device and transmits the longitudinal force data to the terminal device, the method further comprises: the terminal device acquires longitudinal force data and displays the longitudinal force data; and if the longitudinal force data exceeds a preset threshold value, the terminal device gives an abnormal prompt, displays an abnormal vehicle and displays an abnormal compartment in the abnormal vehicle.
A third aspect of embodiments of the present invention provides a railway wagon comprising a monitoring system as described above.
According to the coupler longitudinal force monitoring system and method and the railway wagon provided by the embodiment of the invention, at least the following beneficial effects are achieved: the method and the device can provide data support for evaluation of the car coupler force and the braking force, can optimize braking control of the train, reduce operation and maintenance cost, bring economic benefits for users, and promote intelligent development of the railway freight car. The traction force sensor and the compression force sensor are used for collecting and detecting longitudinal force data of the car coupler in real time, and storing and sending the data to the terminal device, so that related personnel can know the longitudinal force condition of the car coupler in time conveniently, train braking control is optimized, and safe operation of the railway wagon is guaranteed. The application can realize batch loading application. The longitudinal force data of the car coupler can be detected in real time, the running state of the car can be intelligently monitored, and the running safety of the railway freight car is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic block diagram of a monitoring system according to an embodiment;
fig. 2 is a flow chart of a monitoring method according to an embodiment.
The reference numerals are explained below: 1. a longitudinal force detection device; 2. a data processing device; 3. a data transmission device; 4. a terminal device; 5. a traction force sensor; 6. a compression force sensor; 7. a first amplifier; 8. a second amplifier; 9. a data processing module; 10. a power supply module; 11. a self-generating device; 12. a battery; 13. a storage module; 14. a wireless module; 15. and identifying the module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "communicate," "mount," "connect," and "connect" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.
The following briefly explains the technical scheme of the monitoring system of the present application:
according to some embodiments, as shown in fig. 1, to optimize heavy-duty train braking maneuvers and improve train operational safety, the present application provides a coupler longitudinal force monitoring system, comprising:
the device comprises a longitudinal force detection device 1, a coupler buffer device and a coupler buffer device, wherein the longitudinal force detection device 1 is used for acquiring longitudinal force data of the coupler;
a data processing device 2, wherein the data processing device 2 is connected with the longitudinal force detection device 1;
the data transmission device 3 is connected with the data processing device 2, and the data processing device 2 and the data transmission device 3 are connected with a coupler buffer device;
and the terminal device 4 is connected with the data transmission device 3, the data processing device 2 receives the longitudinal force data detected by the longitudinal force detection device 1, transmits the longitudinal force data to the terminal device 4 through the data transmission device 3 for display, and when the longitudinal force data exceeds a preset threshold value, the terminal device 4 gives an abnormal prompt.
Based on the above embodiment, the longitudinal force detecting device 1 is disposed in the coupler buffer device, and the data processing device 2 and the data transmission device 3 are disposed near the coupler buffer device and connected to the coupler buffer device. The problem of traditional sensor mounting structure is limited is solved. The problem that the monitoring system can not be used in batch and the problem that data can not be monitored in real time are further solved.
Further, the data processing device 2 detects longitudinal force data through the longitudinal force detection device 1, and transmits the longitudinal force data to the terminal device 4 through the data transmission device 3, the terminal device 4 displays the longitudinal force data, and when the longitudinal force data exceeds a preset threshold value, the terminal device 4 sends an abnormal prompt to prompt a worker that the longitudinal force is abnormal, so that the worker can check and maintain the train in time. When the longitudinal force data do not exceed the preset threshold value, the longitudinal force detection device 1, the data processing device 2, the data transmission device 3 and the terminal device 4 work normally, wherein the longitudinal force detection device 1 is used for collecting the longitudinal force data of the car coupler, the data processing device 2 is used for processing the longitudinal force data collected by the longitudinal force detection device 1 and then transmitting the longitudinal force data to the terminal device 4 through the data transmission device 3, the data transmission device 3 is used for interacting information with the terminal device 4, and the terminal device 4 is used for displaying the longitudinal force data and giving an alarm.
In some embodiments, the above-mentioned vehicles may be trains, automobiles, locomotives, and the like.
The monitoring system of the present application is further described in detail below with reference to fig. 1 of the present specification.
According to some embodiments, as shown in fig. 1, the longitudinal force detection device 1 comprises:
the traction force sensor 5 is used for acquiring longitudinal force data borne by the vehicle in a traction state;
and the compression force sensor 6 is used for acquiring longitudinal force data borne by the vehicle in a compressed state.
Based on the above-described embodiment, the traction force sensor 5 collects the longitudinal force data to which the longitudinal force detection device 1 is subjected in a pulled state of the vehicle.
The compression force sensor 6 collects longitudinal force data borne by the longitudinal force detection device 1 of the vehicle in a compressed state.
The longitudinal force data of the longitudinal force detection device 1 is consistent with that of the coupler, and the detected longitudinal force data of the longitudinal force detection device 1 is equal to that of the coupler.
The longitudinal force data is collected by the traction force sensor 5 when the vehicle is in a pulled state. Longitudinal force data is collected by the compression force sensor 6 while the vehicle is in compression.
According to some embodiments, as shown in fig. 1, the traction sensor 5 is connected to a first amplifier 7, the compression force sensor 6 is connected to a second amplifier 8, and the first amplifier 7 and the second amplifier 8 amplify and output longitudinal force data collected by the traction sensor 5 and the compression force sensor, respectively.
Based on the above embodiment, the signals collected by the traction force sensor 5 and the compression force sensor 6 are weak, the signals collected by the traction force sensor 5 are amplified by the first amplifier 7, and the signals collected by the compression force sensor 6 are amplified by the second amplifier 8.
According to some embodiments, as shown in fig. 1, the data processing device 2 comprises a data processing module 9 and a power module 10, an output of the power module 10 supplying power to the longitudinal force detection device 1, the data transmission device 3 and the data processing module 9.
The data processing module 9 is configured to receive longitudinal force data acquired by the traction force sensor 5 and the compression force sensor 6, and the data processing module 9 receives the longitudinal force data and transmits the longitudinal force data to the terminal device 4 through the data transmission device 3.
According to some embodiments, as shown in fig. 1, the monitoring system further includes a self-power generation device 11 and a battery 12, wherein the input end of the power module 10 is connected to the self-power generation device 11 and the battery 12, respectively, when the self-power generation device 11 is operated, the self-power generation device 11 supplies power to the power module 10 and the battery 12, and when the self-power generation device 11 is not operated, the battery 12 supplies power to the power module 10.
Based on the above embodiment, the self-generating device 11 is disposed on the vehicle, and is used for supplying power to the longitudinal force detection device 1, the data processing module 9 and the data transmission device 3 through the power supply module 10 when the vehicle is running. The power module 10 is used for rectification, filtering and voltage stabilization, so that the back-end circuit can operate stably. When the self-generating device 11 does not work or is damaged, the battery 12 is used for supplying power to the power module 10, and the power module 10 supplies power to the longitudinal force detection device 1, the data processing module 9 and the data transmission device 3. After the self-generating device 11 is recovered to normal, the self-generating device 11 supplies power to the longitudinal force detection device 1, the data processing module 9 and the data transmission device 3 through the power module 10. While charging the battery 12.
Further, as shown in fig. 1, the data transmission device 3 includes a storage module 13 and a wireless module 14, the storage module 13 is used for storing the longitudinal force data, the storage module 13 is connected to the wireless module 14, and the wireless module 14 transmits the longitudinal force data in the storage module 13 to the terminal device 4.
The storage module 13 is configured to cache the longitudinal force data sent by the data processing module 9, so as to improve stability of the data transmission device 3.
In some embodiments, the data transmission device 3 may transmit all the longitudinal force data in real time according to actual requirements, or may transmit abnormal longitudinal force data only when a potential safety hazard exists in the operation of the railway wagon.
In some embodiments, a data interface is reserved in the data transmission device 3 for copying and reading the longitudinal force data by a worker.
Further, the wireless module 14 interacts with the terminal device 4 through wireless communication, which includes LoRa wireless communication and/or GPRS communication technology and/or satellite system.
Further, as shown in fig. 1, the data processing device 2 and the data transmission device 3 are integrated and packaged into a single body.
According to some embodiments, the monitoring system further comprises an identification module 15, the identification module 15 is used for locating all vehicles and locating each compartment of the vehicle, when the longitudinal force data is abnormal, the terminal device 4 locates the abnormal vehicle and locates the abnormal compartment of the abnormal vehicle through the identification module 15.
Based on the above embodiment, the identification module 15 may be used to locate all cars of one train, and may also be used to locate a set number of trains, and a set number of cars of a train. When the longitudinal force data is abnormal, the data processing device 2 locates the abnormal vehicle and locates the abnormal compartment in the abnormal vehicle through the identification module 15, and sends the specific positions of the abnormal vehicle and the abnormal compartment to the terminal device 4 through the data transmission device 3, and then the terminal device 4 sends out an abnormal prompt, so that a worker can find the abnormal vehicle and find the abnormal compartment of the abnormal vehicle through the abnormal vehicle and the abnormal compartment displayed by the terminal device 4.
Further, as shown in fig. 1, the terminal device 4 comprises a vehicle and/or a locomotive and/or a ground data platform and/or a handheld mobile device.
The monitoring method of the present application is further described in detail below with reference to fig. 2 of the present specification.
According to some embodiments, as shown in fig. 2, the present application provides a coupler longitudinal force monitoring method, which is applied to the monitoring system as described above, and the monitoring method includes:
102, processing the longitudinal force data transmitted by the longitudinal force detection device 1 by the data processing device 2, and storing the longitudinal force data to the data transmission device 3;
Further, in step 103, after the data transmission device 3 receives the longitudinal force data stored by the data processing device 2 and transmits the longitudinal force data to the terminal device 4, the method further includes:
step 1031, the terminal device 4 acquires longitudinal force data and displays the longitudinal force data;
step 1032, if the longitudinal force data exceeds the preset threshold, the terminal device 4 issues an abnormal prompt, displays an abnormal vehicle, and displays an abnormal compartment in the abnormal vehicle.
Step 1032 further includes that, if the longitudinal force data does not exceed the preset threshold, the terminal device 4 does not send an abnormal prompt. Step 101, step 102, step 103 and step 1031 continue to be repeatedly executed.
Specifically, in step 101, the longitudinal force detection device 1 acquires longitudinal force data of the coupler, and transmits the longitudinal force data, a vehicle number corresponding to the longitudinal force data, a car number in the vehicle number, and a number of the longitudinal force detection device 1 to the data processing device 2;
in step 102, the data processing device 2 obtains the longitudinal force data, the vehicle number corresponding to the longitudinal force data, the car number in the vehicle number, and the number of the longitudinal force detection device 1 itself, and then compares the longitudinal force data with a preset threshold. If the longitudinal force data do not exceed the preset threshold value, the longitudinal force data are normal; and if the longitudinal force data exceeds a preset threshold value, indicating that the longitudinal force data is abnormal. The data processing device 2 combines the longitudinal force data, the vehicle number corresponding to the longitudinal force data, the carriage number in the vehicle number and the number of the longitudinal force detection device 1 into a group of data, and the data are packaged and stored in the data transmission device 3.
In step 103, the data transmission device 3 transmits the packaged longitudinal force data to the terminal device 4.
In step 1032, the terminal device 4 analyzes the packed longitudinal force data, and does not issue an abnormal indication when the longitudinal force data is normal data, and issues an abnormal indication when the longitudinal force data is abnormal data. And displays the vehicle number corresponding to the longitudinal force data, the car number in the vehicle number, and the number of the longitudinal force detection device 1 itself, based on the vehicle number corresponding to the longitudinal force data obtained by the analysis, the car number in the vehicle number, and the number of the longitudinal force detection device 1 itself. The staff can quickly know the specific position of the abnormity.
In some embodiments, the data transmission device 3 may transmit all the longitudinal force data in real time according to actual requirements, or may transmit abnormal longitudinal force data only when a potential safety hazard exists in the operation of the rail wagon.
According to some embodiments, the present application provides a railway wagon comprising a monitoring system as described above.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
While the present disclosure has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present disclosure may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (13)
1. A coupler longitudinal force monitoring system, the monitoring system comprising:
the device comprises a longitudinal force detection device, a coupler buffer device and a coupler buffer device, wherein the longitudinal force detection device is used for acquiring longitudinal force data of the coupler;
the data processing device is connected with the longitudinal force detection device;
the data transmission device is connected with the data processing device, and the data processing device and the data transmission device are connected with a coupler buffer device;
and the data processing device receives the longitudinal force data detected by the longitudinal force detection device, transmits the longitudinal force data to the terminal device through the data transmission device for display, and sends an abnormal prompt when the longitudinal force data exceeds a preset threshold value.
2. The monitoring system of claim 1, wherein the longitudinal force detection device comprises:
the traction force sensor is used for acquiring longitudinal force data borne by the vehicle in a traction state;
and the compression force sensor is used for acquiring longitudinal force data borne by the vehicle in a compressed state.
3. The monitoring system of claim 2, wherein a first amplifier is connected to the traction sensor, a second amplifier is connected to the compression force sensor, and the first amplifier and the second amplifier amplify and output longitudinal force data collected by the traction sensor and the compression force sensor respectively.
4. The monitoring system of claim 1, wherein the data processing device comprises a data processing module and a power module, an output of the power module supplying power to the longitudinal force detection device, the data transmission device and the data processing module.
5. The monitoring system according to claim 4, further comprising a self-power-generation device and a battery, wherein the input terminal of the power module is connected to the self-power-generation device and the battery, respectively, when the self-power-generation device is operated, the self-power-generation device supplies power to the power module and the battery, and when the self-power-generation device is not operated, the battery supplies power to the power module.
6. The monitoring system of claim 1, wherein the data transmission device comprises a memory module and a wireless module, the memory module is used for storing the longitudinal force data, the memory module is connected with the wireless module, and the wireless module transmits the longitudinal force data in the memory module to the terminal device.
7. The monitoring system of claim 6, wherein the wireless module interacts with the terminal device via wireless communication, the wireless communication comprising LoRa wireless communication and/or GPRS communication technology and/or satellite system.
8. The monitoring system of claim 1, wherein the data processing device and the data transmission device are integrated and packaged as a single unit.
9. The monitoring system of claim 1, further comprising an identification module for locating all vehicles and locating each car of a vehicle, wherein when the longitudinal force data is abnormal, the terminal device locates an abnormal vehicle and locates an abnormal car of the abnormal vehicle through the identification module.
10. A monitoring system according to claim 1, wherein the terminal device comprises a vehicle and/or a locomotive and/or a ground data platform and/or a handheld mobile device.
11. A coupler longitudinal force monitoring method applied to the monitoring system according to any one of claims 1 to 10, wherein the monitoring method comprises the following steps:
the longitudinal force detection device collects longitudinal force data of the car coupler and transmits the longitudinal force data to the data processing device;
the data processing device processes the longitudinal force data transmitted by the longitudinal force detection device and stores the longitudinal force data to the data transmission device;
the data transmission device receives the longitudinal force data stored by the data processing device and sends the longitudinal force data to the terminal device.
12. The monitoring method according to claim 11, wherein after the data transmission device receives the longitudinal force data stored by the data processing device and transmits the longitudinal force data to the terminal device, the method further comprises:
the terminal device acquires longitudinal force data and displays the longitudinal force data;
and if the longitudinal force data exceeds a preset threshold value, the terminal device gives an abnormal prompt, displays an abnormal vehicle and displays an abnormal compartment in the abnormal vehicle.
13. A railway wagon, wherein the railway wagon comprises a monitoring system as claimed in any one of claims 1 to 10.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310073288.4A CN115979490A (en) | 2023-01-13 | 2023-01-13 | Coupler longitudinal force monitoring system and method and railway wagon |
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| CN202310073288.4A CN115979490A (en) | 2023-01-13 | 2023-01-13 | Coupler longitudinal force monitoring system and method and railway wagon |
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| CN202310073288.4A Pending CN115979490A (en) | 2023-01-13 | 2023-01-13 | Coupler longitudinal force monitoring system and method and railway wagon |
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