Train axle temperature wireless detection system

Abstract

The application belongs to the technical field of sensor detection, and provides a train axle temperature wireless detection system, which comprises: a temperature sensor arranged in a pre-drilled hole on the top of an axle box of a train; a signal switching device installed at the bottom of the train and electrically connected with a plurality of temperature sensors; the signal switching device is configured to communicate with a running part axle temperature monitoring system through a wireless sensing gateway; when the signal switching device is activated, it diagnoses the state of the temperature sensor while transmitting the axle temperature signal to the wireless sensing gateway. The application has the advantages that based on the characteristics of sensor fault diagnosis, the signal switching device meets the axle temperature signal transmission, has multiple diagnosis modes such as sensor working state self-diagnosis and trigger diagnosis, can facilitate the timely discovery of sensor fault information and rapid repair, and improves the repair efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sensor detection, in particular to a train axle temperature wireless detection system. BACKGROUND

[0002] The axle temperature sensors used by the railway department in China mostly adopt temperature sensors based on platinum resistance temperature measurement principle. The probe end of the sensor is inserted into the inside of the temperature measurement point, and the rear end is connected to the upper system by a connector for power supply and communication. The sensor probe is installed in the pre-drilled hole of the axle box and fixed by screws. The sensor has the characteristics of simple principle, high measurement accuracy, good vibration resistance, etc. However, the following shortcomings are exposed in the long-term use process:

[0003] 1) The sensor networking scheme requires a large amount of cable layout, and the cable cost and labor cost are often higher than the sensor itself;

[0004] 2) There are many sensors installed on the train, and the sensor network is complex, making it difficult to maintain the cable in the later period;

[0005] 3) It does not have a fault diagnosis function, and the maintenance cost is high.

[0006] Many current wireless axle temperature sensing schemes can be divided into two categories. One category uses an energy collector for power supply, which has a high cost and is difficult to be compatible with the current train sensor network. The other category uses a battery for power supply, and the sensor is installed at the axle end of the train. This type of sensor has a complex structure, high power consumption, low battery endurance, and is not compatible with the current train sensor network. SUMMARY

[0007] The purpose of the present application is to provide a train axle temperature wireless detection system to solve the above problems.

[0008] In order to achieve the above purpose, the technical scheme adopted by the present application is:

[0009] A train axle temperature wireless detection system, comprising:

[0010] a temperature sensor arranged in a pre-drilled hole on the top of the axle box of the train;

[0011] a signal switching device installed at the bottom of the train and electrically connected to a plurality of temperature sensors;

[0012] The signal switching device is configured to communicate with the running gear axle temperature monitoring system through a wireless sensor gateway. When the signal switching device is activated, it diagnoses the state of the temperature sensor while transmitting the axle temperature signal to the wireless sensor gateway.

[0013] Further, the signal switching device is configured to determine the working state of the temperature sensor according to the resistance value of the temperature sensor and output a corresponding fault code.

[0014] Further, the signal switching device is configured to determine the working state of the temperature sensor by comparing the temperature value output by the signal switching device with the temperature value obtained by the ring temperature chip.

[0015] Further, the signal switching device is configured to determine the working state of the temperature sensor by comparing the temperature value output by the signal switching device with the temperature value obtained by the ring temperature chip.

[0016] Further, the signal switching device is configured to receive a detection instruction from a wireless sensor gateway to detect the working state of the temperature sensor and / or the temperature sensor is configured to upload temperature data at a certain time so that the signal switching device can detect the working state of the temperature sensor.

[0017] Further, the signal switching device comprises:

[0018] The shell is in sealing connection with the upper cover.

[0019] The shell is provided with a first accommodating cavity, and the upper cover is provided with a second accommodating cavity corresponding to the first accommodating cavity.

[0020] Further, the circuit assembly comprises a signal board and a power supply board.

[0021] The signal board is arranged on the upper layer of the power supply board, and the upper surface thereof is flush with the top end of the shell.

[0022] Further, the shell is provided with a third accommodating cavity, and a battery assembly is arranged in the third accommodating cavity.

[0023] Further, the upper cover is provided with a first recess corresponding to the third accommodating cavity, and a protective pad is arranged in the first recess.

[0024] Further, an electrical connector connected to the circuit assembly through a cable is arranged, and the electrical connector extends to the outside of the shell through a circular hole arranged on the side surface of the shell.

[0025] Compared with the prior art, the present application has at least the following beneficial effects:

[0026] (1) The signal switching device is based on the characteristics of sensor fault diagnosis, and has sensor working state self-diagnosis, trigger diagnosis and other diagnostic methods while meeting the transmission of axle temperature signal, so as to facilitate timely discovery of sensor fault information and rapid repair, and improve the repair efficiency.

[0027] (2) The signal switching device adopts two different detection methods for the running and static states of the train, so that the running part axle temperature monitoring system can monitor the working state of each temperature sensor in real time.

[0028] (3) The signal switching device adopts a wireless communication networking mode, which can not penetrate the car and at the same time ensures good communication quality without increasing signal strength, further reducing the power consumption of the device.

[0029] (4) One signal switching device can be connected with four temperature sensors, so only one signal switching device needs to be installed on one bogie to realize wireless communication, which can greatly reduce the material and labor costs of wiring and improve reliability.

[0030] (5) The signal switching device is internally configured with a large-capacity rechargeable battery, and the temperature sensor does not need to be powered when connected with the signal switching device, so the signal switching device can power it, thus all cable arrangements can be completed on the bogie, with the advantages of short wiring length, large wiring operation space, short installation period, etc. BRIEF DESCRIPTION OF DRAWINGS

[0031] Fig. 1 is a schematic diagram of the installation position of the temperature sensor in the embodiment of the present application;

[0032] Fig. 2 is a schematic diagram of the installation position of the signal switching device in the embodiment of the present application;

[0033] Fig. 3 is a schematic diagram of the structure of the signal switching device in the embodiment of the present application;

[0034] Fig. 4 is a schematic diagram of the cross-section of the signal switching device in the embodiment of the present application;

[0035] Fig. 5 is a schematic diagram of the architecture of the circuit component in the embodiment of the present application. DETAILED DESCRIPTION

[0036] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0037] In addition, the descriptions such as "first", "second", "one", etc. in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0038] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixing", etc. should be understood broadly, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through intermediate medium, can be internal communication of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In addition, the technical solutions of various embodiments of the present application can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0040] The following are specific embodiments of the present application, and the technical solutions of the present application are further described in conjunction with the drawings, but the present application is not limited to these embodiments.

[0041] As shown in Figs. 1-2 The present application provides a train axle temperature wireless detection system, which comprises: a temperature sensor arranged in a pre-drilled hole on the top of the train axle box, and a signal switching device installed at the bottom of the train and electrically connected with a plurality of temperature sensors respectively.

[0042] The signal switching device communicates with the running part axle temperature monitoring system through a wireless sensing gateway. When the signal switching device is activated, it can diagnose the state of the temperature sensor while transmitting the axle temperature signal to the wireless sensing gateway.

[0043] Firstly, when the signal switching device is in the active state, the resistance value of the platinum resistance in the temperature sensor and the ring temperature chip data are collected to obtain the resistance value R1 and the ring temperature data T. Then the size of the resistance value R1 is determined. When the resistance value R1 is in the predetermined range, the temperature value T1 is matched and outputted. When the resistance value is not in the predetermined range, the signal switching device determines that the platinum resistance in the temperature sensor is short-circuited or open-circuited, and outputs the corresponding fault code. In addition, when the resistance value data of the platinum resistance fluctuates back and forth and fluctuates greatly, it is determined that the platinum resistance is in poor contact, and the corresponding fault code is outputted. The operation or maintenance personnel can quickly obtain the sensor working state data by querying the fault code, so as to quickly judge the working state of the sensor.

[0044] Secondly, after the signal switching device outputs the temperature value T1, it is compared with the ring temperature data T. When the absolute values of the two do not exceed a certain threshold value, it can be determined that the sensor is working normally and the temperature data is reliable.

[0045] Finally, when the train runs for a long time, the working state of the temperature sensor can also be judged by comparing the temperature rising or falling trend of multiple channel temperature data. The working state diagnosis process of the temperature sensor during operation is as follows.

[0046] (1) When the temperature change rate of one or two sensors is small, the temperature change data of the sensor in a unit response time is collected. If it is lower than a certain threshold value, it is determined that the response time of the sensor is long and the working state is slightly poor.

[0047] (2) After the train runs stably, if the temperature data of a certain sensor or two sensors exceeds a certain threshold value from the temperature data of other sensors, it is determined that the sensor is in a fault state. During the maintenance of the vehicle, the sensor channel can be replaced for verification. If the phenomenon still occurs after replacement, the sensor needs to be replaced.

[0048] During the operation of the train, the signal switching device is configured to receive the detection instruction of the wireless sensor gateway to detect the working state of the temperature sensor or the temperature sensor to upload the temperature data to the signal switching device so that the signal switching device detects the working state. If the above two situations occur, the signal switching device will directly output the corresponding fault code, so that the monitoring personnel determines whether the train needs to be repaired.

[0049] Based on the characteristics of sensor fault diagnosis, the signal switching device meets the transmission of axle temperature signal, has sensor working state self-diagnosis, trigger type diagnosis and other diagnosis methods, which is convenient for timely discovery of sensor fault information and rapid repair, and improves the repair efficiency.

[0050] As Figs. 3-5As shown, the signal adapter mainly consists of a metal shell 1, a circuit assembly, an upper cover 2, a battery assembly, a sealing ring, an electrical connector 17, etc. The electrical connector 17 in the signal adapter is compatible with the temperature sensor based on the platinum resistance principle currently used in China, and the temperature sensor can be directly plugged into the electrical connector 17. Multiple temperature sensors can also be connected to the signal adapter through an adapter wire. A single signal adapter can match up to four temperature sensors, and no additional power supply is required for the temperature sensor. The signal adapter can supply power to the temperature sensor, so all cable arrangements can be completed on the bogie, with the advantages of short wiring length, large wiring operation space, short installation period, etc.

[0051] The shell 1 of the signal adapter is made of, but not limited to, aluminum alloy, and is subjected to surface treatment, but not limited to anodic oxidation treatment. The shell 1 has a round hole on the side for installing the electrical connector 17, and adopts a sunken structure to sink the electrical connector 17, so that the installation surface of the electrical connector 17 is flush with the shell 1. The bottom of the electrical connector 17 is equipped with a rubber pad to achieve waterproof and dustproof purposes. In addition, the top of the shell 1 is provided with a groove for installing an O-shaped sealing ring, and the O-shaped sealing ring is compressed by the upper cover 2 to achieve an IP67 waterproof level.

[0052] The inside of the shell 1 adopts a distributed cavity design. Since metal can shield wireless communication, the upper cover 2 is made of a non-metallic material. The material of the upper cover 2 is a composite material such as, but not limited to, PA66+30% GF. Therefore, a first accommodating cavity 11 is arranged in the shell 1, a second accommodating cavity 21 corresponding to the first accommodating cavity 11 is arranged in the upper cover 2, and a circuit assembly is arranged in the cavity formed by the first accommodating cavity 11 and the second accommodating cavity 21. The circuit assembly is installed by a hexagonal stud and fixed by a screw assembly. The PCB board in the circuit assembly adopts an upper-lower stacked structure, the upper layer is a signal board 13, and the lower layer is a power board 12. The two boards communicate and supply power through a board-level connector. To ensure the quality of wireless communication, the upper surface of the signal board 13 is flush with the top of the shell 1.

[0053] A control chip, an ambient temperature chip, and a wireless communication module electrically connected with the controller are arranged on the signal board 13. An external temperature sensor provides a temperature signal for the signal adapter, and communicates with the signal adapter through the electrical connector 17. The device contains a built-in board-level Bluetooth wireless communication module, and can communicate with the bogie temperature monitoring system through a wireless sensing gateway. The signal adapter sends temperature data to the gateway, and the gateway collects data and then forwards the data to the bogie temperature monitoring system. In addition, an ambient temperature chip is welded on the signal board 13 of the device, and the ambient temperature data provided by the ambient temperature chip can be used to compare and diagnose the initial state of the sensor.

[0054] The built-in board-level Bluetooth wireless communication module is reinforced by glue, which can reduce the shielding effect of the metal shell 1 on the wireless signal, reduce the influence on the signal quality, and improve the product reliability.

[0055] A third accommodating cavity 14 is arranged in the shell 1, and a battery assembly 15 is arranged in the third accommodating cavity 14 and electrically connected with the power board 12.

[0056] The battery assembly 15 is connected with the PCB board by a cable, the device is powered by a large-capacity battery, and high-quality power is provided for the control chip and the Bluetooth wireless communication module after being processed by a power module.

[0057] The signal switching device in the application adopts but is not limited to a Bluetooth wireless communication networking mode, and can communicate with the running part shaft temperature monitoring system through a wireless sensing gateway.

[0058] Through the above-mentioned networking mode, wireless communication can not need to penetrate the car compartment, and good communication quality is ensured, signal strength is not needed to be increased, and device power consumption is further reduced.

[0059] The specific embodiments described in the present application are only examples of the spirit of the application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the application or exceed the scope defined by the appended claims.

Claims

1. A train axle temperature wireless detection system, characterized in that, The application relates to a temperature sensor, a signal switching device and a signal switching device. The temperature sensor is arranged in a pre-drilled hole on the top of an axle box of a train. The signal switching device is arranged on the bottom of the train and is electrically connected with the temperature sensor. The signal switching device is configured to communicate with a running gear axle temperature monitoring system through a wireless sensing gateway. When the signal switching device is activated, it diagnoses the state of the temperature sensor while transmitting the axle temperature signal to the wireless sensing gateway. When the signal switching device is in the activated state, it is configured to judge the working state of the temperature sensor according to the resistance value of the temperature sensor and output the corresponding fault code. The signal switching device judges the working state of the temperature sensor by comparing the temperature value with the temperature value obtained by the ring temperature chip. When the train runs for a long time, the working state of the temperature sensor is judged by comparing the temperature change trend of the temperature data of multiple channels. When the temperature change rate of one or two sensors is small, the temperature change data of the sensor in the unit response time is collected. If the difference between the temperature data of the sensor and the temperature data of other sensors exceeds a certain threshold value, the sensor is determined to be in a fault state. The signal switching device comprises a shell and an upper cover sealedly connected with the shell. A first accommodating cavity is arranged in the shell, and a second accommodating cavity corresponding to the first accommodating cavity is arranged in the upper cover.

2. The train axle temperature wireless detection system of claim 1, wherein, An electric circuit assembly is arranged in the cavity formed by the first accommodating cavity and the second accommodating cavity.

3. The train axle temperature wireless detection system of claim 1, wherein, The electric circuit assembly comprises a signal board and a power supply board.

4. The train axle temperature wireless detection system of claim 3, wherein, The signal board is arranged on the upper layer of the power supply board, and the upper surface of the signal board is flush with the top end of the shell.

5. The train axle temperature wireless detection system of claim 1, wherein, A control chip and a wireless communication module electrically connected with the control chip are arranged on the signal board. The power supply board is electrically connected with the signal board through a board-level connector. The signal switching device is configured to receive a detection instruction of the wireless sensing gateway to detect the working state of the temperature sensor and / or the temperature sensor to upload the temperature data so that the signal switching device detects the working state. A third accommodating cavity is arranged in the shell, and a battery assembly is arranged in the third accommodating cavity. The battery assembly is electrically connected with the power supply board. A first recess corresponding to the third accommodating cavity is arranged in the upper cover, and a protective pad is arranged in the first recess. An electric connector connected with the electric circuit assembly through a cable is arranged in the shell. The electric connector extends to the outside of the shell through a round hole arranged on the side surface of the shell.

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