Contact rail expansion joint on-line monitoring device

Abstract

The utility model discloses an on-line monitoring device for a contact rail expansion joint. The on-line monitoring device comprises a monitoring module, a control module and a central controller, the monitoring module comprises a first temperature sensor, a second temperature sensor, a third temperature sensor and a displacement sensor; the first temperature sensor and the second temperature sensor are respectively arranged at two ends of the electrical splicing part of the contact rail expansion joint, and the third temperature sensor is tightly attached to the contact rail expansion joint; the displacement sensor is mounted at one end of the contact rail expansion joint; the control module is electrically connected with the first temperature sensor, the second temperature sensor and the displacement sensor, and the control module is in communication connection with the central controller. The device can monitor the working state of the contact rail expansion joint in real time, reduces the operation and maintenance workload, enables a traction power supply system to operate safely and reliably, and avoids safety accidents.

Description

Technical Field

[0001] The utility model belongs to the technical field of urban rail transportation, and particularly relates to an online monitoring device for a contact rail expansion joint. Background Art

[0002] The contact rail power supply system is a crucial component of urban rail transit. Year-round, it's subject to the erosion of the elements, including wind, frost, rain, and snow, as well as the impact and vibration of the high-speed collector shoe. Its mechanical and electrical performance is constantly changing. As a key component of the contact rail system, expansion joints, in addition to compensating for the normal thermal expansion and contraction of the contact rail, are also affected by the thermal expansion and contraction of the track, bridges, and other civil infrastructure. Coupled with weather conditions and installation errors, some expansion joints have been found to have compensation gaps approaching their limit on some lines. When expansion joints exceed their compensation limits, damage to contact rail system components can occur, seriously impacting driving safety.

[0003] Currently, the primary method for monitoring contact rail systems, both domestically and internationally, is manual inspection. This method is inefficient, inaccurate, and slow to respond. It not only consumes significant labor costs but is also limited by time and weather conditions, making it impossible to provide all-weather measurements. With the rapid development of sensor and electronic measurement technologies, the use of IoT technology, advanced monitoring methods, and modern monitoring equipment to monitor contact rail systems in real time is becoming an important means of achieving intelligent status monitoring and maintenance for rail transit. Therefore, it is necessary to develop an online monitoring and early warning device to monitor the working status of expansion joints in real time, reduce operational and maintenance workloads, ensure the safe and reliable operation of the traction power supply system, and avoid safety accidents. Summary of the Invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides an online monitoring device for contact rail expansion joints. The technical problems to be solved by the present invention are achieved through the following technical solutions:

[0005] An online monitoring device for a contact rail expansion joint includes: a monitoring module, a control module and a central controller; wherein,

[0006] The monitoring module includes a first temperature sensor, a second temperature sensor, a third temperature sensor and a displacement sensor; the first temperature sensor and the second temperature sensor are respectively arranged at both ends of the electrical connection part of the contact rail expansion joint, and the third temperature sensor is closely attached to the contact rail expansion joint; the displacement sensor is installed at one end of the contact rail expansion joint; the control module is electrically connected to the first temperature sensor, the second temperature sensor and the displacement sensor, respectively, and the control module is communicatively connected to the central controller.

[0007] Furthermore, the first temperature sensor, the second temperature sensor, the third temperature sensor and the displacement sensor are all contact sensors.

[0008] Preferably, the first temperature sensor, the second temperature sensor and the third temperature sensor are all platinum resistance sensors.

[0009] Furthermore, a polytetrafluoroethylene protective cover is provided on the surface of the lead of the platinum resistance sensor.

[0010] Furthermore, the displacement sensor is a wire-type displacement sensor, the body of which is installed in the control module located at one end of the contact rail expansion joint, the wire end extends out of the control module and its end is fixed to the other end of the contact rail expansion joint.

[0011] Furthermore, the control module includes a housing, a main board and a sensor interface; the main board is arranged in the housing, and the first temperature sensor, the second temperature sensor and the third temperature sensor are electrically connected to the main board through the sensor interface respectively; the third temperature sensor is arranged on a side of the housing close to the contact rail expansion joint, so that the third temperature sensor is close to the contact rail expansion joint.

[0012] Furthermore, the wire-type displacement sensor uses a stainless steel wire, and a wire protection tube is provided on the stainless steel wire.

[0013] Beneficial effects of the utility model:

[0014] 1. The monitoring device realizes online monitoring of the expansion joint compensation amount through the displacement sensor, which improves the safety of the power supply system and reduces the cost of manual inspection;

[0015] 2. The monitoring device can monitor the temperature of the key electrical connection parts of the expansion joint (such as the fixed position of the current connector) through the temperature sensor to prevent electrical ablation;

[0016] 3. The monitoring device can monitor the working status of the contact rail expansion joint in real time, reduce the workload of operation and maintenance, ensure the safe and reliable operation of the traction power supply system, and avoid safety accidents.

[0017] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the utility model;

[0019] Figure 2 for Figure 1 A schematic diagram of the partially enlarged structure of part A;

[0020] Figure 3 for Figure 1 The enlarged structural diagram at the middle right end;

[0021] Figure 4 This is a schematic diagram of signal transmission of the present invention.

[0022] Description of reference numerals:

[0023] 1-Monitoring module; 2-Control module; 3-Central controller; 4-Current connector; 5-Contact rail expansion joint; 6-Clamp; 1-1-First temperature sensor; 1-2-Second temperature sensor; 1-3-Third temperature sensor; 1-4-Displacement sensor; 2-1-Casing; 2-2-Sensor interface. DETAILED DESCRIPTION

[0024] The present invention will be described in further detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0025] Please also see Figures 1 to 4 An embodiment of the utility model provides an online monitoring device for a contact rail expansion joint, which includes a monitoring module 1, a control module 2 and a central controller 3; wherein the monitoring module 1 includes a first temperature sensor 1-1, a second temperature sensor 1-2, a third temperature sensor 1-3 and a displacement sensor 1-4; the first temperature sensor 1-1 and the second temperature sensor 1-2 are respectively installed at the electrical connection part, that is, the two ends of the current connector 4. In this embodiment, the current connector 4 is a copper strip, and the first temperature sensor 1-1 and the second temperature sensor 1-2 are respectively installed at the fixed parts of the copper strip; the third temperature sensor 1-3 is tightly attached to the contact rail expansion joint 5, and the displacement sensor 1-4 is installed at one end of the contact rail expansion joint 5. The control module 2 is electrically connected to the first temperature sensor 1-1, the second temperature sensor 1-2, the third temperature sensor 1-3 and the displacement sensor 1-4, respectively, and the central controller 3 is communicatively connected to the control module 2.

[0026] Furthermore, the first temperature sensor 1 - 1 , the second temperature sensor 1 - 2 , the third temperature sensor 1 - 3 and the displacement sensor 1 - 4 are all contact sensors.

[0027] In the embodiment of the present invention, the first temperature sensor 1-1, the second temperature sensor 1-2, and the third temperature sensor 1-3 are all platinum resistance sensors, each having a polytetrafluoroethylene protective cover on its lead surface. Platinum resistance sensors have high measurement accuracy and a wide applicable temperature range. The first temperature sensor 1-1 and the second temperature sensor 1-2 measure the temperature at each joint of the expansion joint contact rail. When the fixing bolts at the joint are loose, the temperature will rise abnormally. Therefore, the first temperature sensor 1-1 and the second temperature sensor 1-2 can promptly determine whether the connection is secure. The third temperature sensor 1-3 measures the temperature of the expansion joint contact rail body, and the corresponding data is calculated and transmitted to the central controller 3 by the control module 2. The central controller 3 compares the measured value with the theoretical value and issues a warning if the actual temperature exceeds a specified range. This monitors the operating status of the contact rail expansion joint 5 and provides early warning to avoid potential safety hazards to train operation.

[0028] In an embodiment of the present invention, the displacement sensors 1-4 are wire-type displacement sensors, specifically stainless steel wires with external wire protection tubes to prevent contamination of the wires by external factors such as dust, rain, and snow. The main body of the wire-type displacement sensor is installed in the control module 2 located at one end of the contact rail expansion joint 5. The wire end of the sensor extends out of the control module 2 and is fixed to the other end of the contact rail expansion joint 5 via a clamp 6. The compensation gap value of the contact rail expansion joint 5 can be monitored in real time by changing the length of the wire. The corresponding data is calculated by the control module 2 and transmitted to the central controller 3. The central controller 3 compares the deviation between the measured value and the theoretical value. If the compensation gap value exceeds the specified range, it will issue a warning, thereby monitoring the working status of the contact rail expansion joint 5 and providing early warning to avoid safety hazards to train operation.

[0029] Furthermore, the control module 2 includes a shell 2-1, a main board, a battery compartment and a sensor interface 2-2; the main board and the battery compartment are arranged in the shell 2-1, and the first temperature sensor 1-1, the second temperature sensor 1-2, and the third temperature sensor 1-3 are electrically connected to the main board through the sensor interface 2-2 respectively; the control module 2 is fixed to the waist of the contact rail expansion joint 5 through a clamp 6, and is located on the outside of the third temperature sensor 1-3, that is, the third temperature sensor 1-3 is arranged on the side of the shell 2-1 that is close to the contact rail expansion joint 5, so that the control module 2 makes the third temperature sensor 1-3 close to the contact rail expansion joint 5.

[0030] Specifically, the sensor interface 2-2 is a quick-connect connector, offering convenient and reliable connection and excellent waterproof sealing. The first temperature sensor 1-1 and the second temperature sensor 1-2 are both connected to the mainboard of the control module 2 via their respective sensor interfaces 2-2. The mainboard calculates the received data and sends it to the edge intelligent gateway via LoRa. The edge intelligent gateway then sends it to the central controller 3 via the 4G network for data display, analysis, and storage. After analyzing and processing the data, the central controller 3 pushes the data, including temperature, displacement, over-limit warning, and device power level, to a mobile terminal, platform client, or large screen for display, and issues a warning message when necessary.

[0031] Furthermore, the control module 2 can collect and transmit data by setting scheduled tasks, and it remains dormant when not collecting data. It is powered by a secondary battery, a solar panel, or a combination of the two. The secondary battery is snap-fitted and can be quickly removed, facilitating unscheduled maintenance by maintenance personnel. Furthermore, the control module 2 has a reserved upgrade interface, including both physical plug-in and over-the-air (OTA) methods, to facilitate future system maintenance and upgrades.

[0032] Furthermore, the clamp 6 that secures the wire-type displacement sensor and control module 2 is made of lightweight aluminum alloy with built-in bolt anti-rotation grooves, making installation simple and reliable. The control module 2 is clamped to the waist of the contact rail, eliminating the need for on-site drilling, making installation easy and space-saving.

[0033] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. An online monitoring device for a contact rail expansion joint, characterized in that: include: Monitoring module, control module and central controller; wherein, The monitoring module includes a first temperature sensor, a second temperature sensor, a third temperature sensor and a displacement sensor; the first temperature sensor and the second temperature sensor are respectively arranged at both ends of the electrical connection part of the contact rail expansion joint, and the third temperature sensor is closely attached to the contact rail expansion joint; the displacement sensor is installed at one end of the contact rail expansion joint; the control module is electrically connected to the first temperature sensor, the second temperature sensor and the displacement sensor, respectively, and the control module is communicatively connected to the central controller.

2. The contact rail expansion joint online monitoring device according to claim 1, characterized in that: The first temperature sensor, the second temperature sensor, the third temperature sensor and the displacement sensor are all contact sensors.

3. The contact rail expansion joint online monitoring device according to claim 2, characterized in that: The first temperature sensor, the second temperature sensor and the third temperature sensor are all platinum resistance sensors.

4. The contact rail expansion joint online monitoring device according to claim 3, characterized in that: The surface of the lead of the platinum resistance sensor is provided with a polytetrafluoroethylene protective sleeve.

5. The contact rail expansion joint online monitoring device according to claim 2, characterized in that: The displacement sensor is a wire-type displacement sensor, the body of which is installed in the control module located at one end of the contact rail expansion joint, the wire end extends out of the control module and its end is fixed to the other end of the contact rail expansion joint.

6. The contact rail expansion joint online monitoring device according to claim 1, characterized in that: The control module includes a shell, a main board, a battery compartment and a sensor interface; the main board and the battery compartment are arranged in the shell, and the first temperature sensor, the second temperature sensor and the third temperature sensor are electrically connected to the main board through the sensor interface respectively; the third temperature sensor is arranged on a side of the shell close to the contact rail expansion joint, so that the third temperature sensor is closely attached to the contact rail expansion joint.

7. The contact rail expansion joint online monitoring device according to claim 5, characterized in that: The wire-type displacement sensor adopts a stainless steel wire, and a wire protection tube is provided on the stainless steel wire.

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