Flexible electric heating turnout automatic snow melting system
By adopting a combination of flexible electric heating elements and intelligent sensors in the switch automatic snow melting system, combined with the automatic control of remote intelligent control terminals and electrical control cabinets, the problems of poor plasticity of heating elements, poor sensor information interaction and unreasonable circuit topology in traditional systems are solved, and a more efficient, safe and economical snow melting effect is achieved.
Patent Information
- Application Number
- CN202420901120.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-28
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-04-28
AI Technical Summary
The traditional automatic snow melting system of electric heating switches has problems such as poor plasticity of heating elements, poor sensor information interaction, unreasonable circuit topology and inability to detect the tight patch of pointed rails, resulting in low equipment efficiency, high cost and great safety hazards.
The combination of flexible electric heating elements, rain and snow sensors and rail temperature sensors is adopted to achieve automated control through remote intelligent control terminals and electrical control cabinets to ensure good fit between the heating elements and the rails, and to achieve accurate snow melting and safety inspection through improved circuit design and sensor monitoring.
It improves the fit between the heating elements and the rails, reduces the equipment opening time, optimizes the circuit structure, reduces energy consumption and maintenance costs, and ensures the tight fit between the movable parts of the pointed rail and the basic rails, improving railway transportation safety.
Smart Images
Figure CN222700890U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a flexible electric heating turnout automatic snow melting system. Background Art
[0002] The railway industry in the high-altitude and cold regions has been affected by natural environmental factors for many years, especially the accumulation of snow in winter, which has long troubled the development of railways. The switching of turnouts is often affected by ice and snow. Snow accumulated on the movable parts of the turnouts or on the roadbed freezes, causing the point rails to not fit tightly and the turnouts to fail to switch normally, leading to liability accidents such as train delays and midway stops. In severe cases, there will be casualties and train derailment.
[0003] In order to ensure the normal operation of the turnout switching equipment in winter, a lot of resources are usually consumed to clear the snow from the turnout. This method has been a long-term problem for the development of railways due to its huge workload and high cost, so the demand for automatic snow removal systems for turnouts is increasing day by day. As a result, the industry of making turnout snow melting devices has risen rapidly in recent years, and the barriers to the international market for turnout snow removal systems have gradually been broken. Electric heating snow removal devices are the best among them, not only with mature technology, but also with a vast market behind them. However, after years of field application, the disadvantages of traditional electric heating turnout automatic snow melting systems have gradually been exposed.
[0004] Through in-depth research on the traditional electric heating turnout automatic snow removal system (mainly for the RD-1 electric heating turnout snow melting system), it is found that it has the following technical bottlenecks:
[0005] (1) The heating element has poor plasticity and is difficult to fit with the rail at the turnout
[0006] The heating elements used in traditional snow removal systems are all rigid heating strips and heating rods. However, these heating elements have poor plasticity and can only fit the rails 60%-70% and cannot fit completely tightly.
[0007] (2) Information exchange between sensors is poor, and the equipment is disconnected for a long time
[0008] Traditional snow removal systems use temperature sensors and railway weather stations to control the operation and stop of the system. Although this detection method can meet the needs of automatic operation, it will cause the equipment to be left open.
[0009] (3) The circuit topology is unreasonable, the wires are complicated, and the resistivity is high
[0010] Traditional snow removal systems have complex circuit structures due to their large number of components, which leads to problems such as difficulty in wiring, waste of electricity, and difficulty in maintenance.
[0011] (4) It is impossible to check the tightness of the movable part of the point rail and the base rail
[0012] In cold and high-altitude areas, the switching of switches is often affected by ice and snow. Snow accumulated on the movable parts of the switch or on the roadbed freezes, causing the point rail to not fit tightly and the switch to fail to switch normally. However, this cannot be detected automatically, often leading to train delays, midway stops and other accidents. In severe cases, serious accidents such as casualties and train derailment may occur. Utility Model Content
[0013] In view of the problems existing in the prior art, the purpose of the utility model is to provide an improved flexible electric heating turnout automatic snow melting system.
[0014] To achieve the above-mentioned purpose, the utility model provides a flexible electric heating turnout automatic snow melting system, comprising a remote intelligent control terminal, an electrical control cabinet, a first relay, a second relay, a rain and snow sensor, a rail temperature sensor, and a flexible electric heating element;
[0015] The rain and snow sensor, the rail temperature sensor, the flexible electric heating element, the first relay, and the second relay are connected by electric wires to form a heating unit;
[0016] The first relay is connected to the electrical control cabinet, the rain and snow sensor, and the rail temperature sensor respectively, and plays the role of connecting the power supply; the second relay is placed between the electrical control cabinet and the flexible electric heating element, and is responsible for connecting and disconnecting the power supply of the heating element;
[0017] The remote intelligent control terminal is connected to the rain and snow sensor and the electrical control cabinet respectively. When the rain and snow sensor detects the presence of rain and snow on the railway line, it will immediately transmit the detected information to the remote intelligent control terminal through the railway signal cable. After receiving the instruction from the remote intelligent control terminal, the electrical control cabinet will be interlocked with the second relay, and the heating unit installed at each switch will be connected in parallel with the second relay through the power cable, so that the power supply is connected to the flexible electric heating element and the rail temperature sensor, and then the snow melting work is carried out.
[0018] Furthermore, according to the number of turnouts on the railway line, it is divided into multiple local areas, and each area is provided with a heating unit, each of which is connected in parallel and can be independently controlled.
[0019] Furthermore, it also includes a station local control console, which is connected to the remote intelligent control terminal to form a data communication and control line.
[0020] Furthermore, the electrical control cabinet is arranged in the turnout throat area on the railway line, and the electrical control cabinet is provided with a flexible electric heating element power interface, a rain and snow sensor power interface, a rail temperature sensor power interface, a rain and snow sensor signal interface and a rail temperature sensor display screen, so as to realize the functions of power supply and signal transmission processing for the flexible electric heating element, rain and snow sensor, rail temperature sensor and rain and snow sensor.
[0021] Furthermore, the flexible electric heating element is designed as an electric heating film in the form of a sandwich structure, which mainly consists of three parts: a nickel-chromium alloy heating wire, a distributed capacitor current absorption film and a silicone rubber high-temperature insulating cloth. The upper and lower layers of the structure adopt a thin sheet composited with a new organic polytetrafluoroethylene waterproof insulation material and glass fiber cloth, and the "sandwich" layer adopts a heating body composed of a nickel-chromium alloy heating wire and a distributed capacitor current absorption film.
[0022] Furthermore, the flexible electric heating element is arranged at the rail waist between the turnout point rail and the movable heart rail, and is fixed by a U-shaped buckle made of metal material.
[0023] Furthermore, two insulating layers are arranged on the outer surface of the flexible electric heating element.
[0024] Furthermore, the electric power source is introduced into the electrical control cabinet through a power through-line or from the railway line contact network. After passing through the manual switch or automatic switch of the electrical control cabinet, the power source is input into the isolation transformer through the wire. The isolation transformer steps down the voltage, converts the current or changes the phase of the power source and then transmits it to the first relay, so that the rain and snow sensor connected to the first relay starts working.
[0025] Furthermore, when the rain and snow sensor detects that there is snowfall in the surrounding environment, the rain and snow sensor triggers the first relay to turn on the power supply, and the rail temperature sensor detects whether the rail temperature meets the system operation requirements, determines whether the rail needs to be heated, and then outputs a signal to the second relay, which starts the flexible electric heating element to start heating and snow removal.
[0026] Furthermore, when there is no rain or snow on the railway line, the rain or snow sensor will send information that no rain or snow is detected to the electrical control cabinet, and the electrical control cabinet will then lose the interlocking relationship between the second relay and the heating unit through the communication cable, cut off the power supply of the heating unit, and stop the snow melting work.
[0027] The utility model solves the drawbacks of traditional turnout snow melting devices, and the automatic turnout snow melting system has technical support such as flexible electric heating elements 1, sensor matching methods and improved wiring methods, which can better solve the problem of snow accumulation on turnouts and ensure railway transportation safety. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1It is a schematic diagram of the structure of the utility model;
[0029] Figure 2 This is a schematic diagram of the circuit connection structure of the electrical control cabinet;
[0030] Figure 3 is a schematic diagram of the heating element structure;
[0031] Figure 4 It is a schematic diagram of the heating element installation structure;
[0032] Figure 5 This is a schematic diagram of the structure of the rain and snow sensor;
[0033] Figure 6 This is a schematic diagram of the connection structure of the rain and snow sensor circuit;
[0034] Figure 7 It is a schematic diagram of the rail temperature sensor structure;
[0035] Figure 8 This is a schematic diagram of the rail temperature sensor installation.
[0036] Fig. 9 This is a schematic diagram of the structure of the turnout close contact checker. DETAILED DESCRIPTION
[0037] The following will be combined with the accompanying drawings to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0040] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.
[0041] like Figures 1 to 9 As shown, the utility model is a flexible electric heating turnout automatic snow melting system, including an electric power supply 21, a remote intelligent control terminal 22, a station local control console 23, an isolation transformer 24, an electrical control cabinet 25, a connector, wires 7, a relay, a rain and snow sensor 6, a rail temperature sensor 5, a railway turnout conversion safety inspection device and a flexible electric heating element 1.
[0042] Among them, the rain and snow sensor 6, the rail temperature sensor 5, the flexible electric heating element 1, the relay and the connector are connected with wires to form a heating unit. In actual use, it can be divided into multiple local ranges according to the number of turnouts on the railway line, and each range is provided with a heating unit. That is, in order to meet the snow melting requirements of long-distance railway lines, multiple heating units are provided on the railway line, and each heating unit can be independently controlled, so as to realize precise snow melting construction, achieve the effect of precise control and energy saving.
[0043] The remote intelligent control terminal 22, composed of a server, network equipment, power supply equipment, electromagnetic interference protection equipment and a workstation, is a remote control and tracking terminal device embedded in the combined computer system of the railway dispatching system CTC, which can realize automatic input of information and automatic export of data. It communicates with the local control terminal of each station through the railway dedicated communication line, and is the primary operating brain of the entire electric heating turnout snow melting system, mainly responsible for the system's data processing, information exchange, centralized monitoring and command issuance.
[0044] The station local control console 23 is placed in the dispatching room of each major station. It is the secondary operating brain of the entire electric heating turnout snow melting system. It is mainly responsible for receiving data feedback from the heating unit, processing it through the computer, and summarizing it in the remote intelligent control terminal 22, and establishing an information channel with it.
[0045] The electrical control cabinet 25 includes a power supply 38, a voltmeter 39, a temperature controller 40, a voltmeter 41, a terminal 42, an air switch circuit breaker 43, an AC contactor 44, a relay 45, and an LRS switch power supply 46. The electrical control cabinet 25 is provided with a flexible electric heating element power supply interface, a rain and snow sensor power supply interface, a rail temperature sensor power supply interface, a rain and snow sensor signal interface, and a rail temperature sensor display screen. It can realize the functions of power supply and signal transmission processing for the flexible electric heating element 1, the rain and snow sensor 6, and the rail temperature sensor 5, and is used to realize equipment automation and process automation. Automatic control and manual control are provided in the control loop of the equipment, and it also has overcurrent, overvoltage, undervoltage, phase loss protection and accident reporting functions. The electrical control cabinet 25 is generally placed in the turnout throat area on the railway line. It is installed in a volume of only 19 inches, which greatly reduces the possibility of intrusion into the railway line limit. It is mainly responsible for the connection and disconnection of the circuits of the subordinate sub-components and controls the start and stop of the snow melting device.
[0046] The rain and snow sensor 6 includes a grid electrode 10, an induction disk 8, an IP86 electrical equipment protective shell 9, an automatic heating device, an intelligent microprocessor, and a detection module. The instrument that uses the conductive properties of rainwater to start the detection circuit and then detects whether there is rain and snow in the surrounding environment is one of the decisive conditions for whether the system starts heating. The rain and snow sensor 6 is generally placed 60cm-80cm from the rear end of the movable part of the turnout point rail, which is the line spacing between two adjacent sleepers on a standard railway line. It is mainly responsible for monitoring whether there is rain and snow or rain and snow conditions in the surrounding environment, and transmitting the collected data to the station local control console 23. In actual applications, the rain and snow sensor 6 can also use products in the existing technology.
[0047] Relay: Transistor voltage relay consists of voltage forming circuit, rectification and filtering circuit, comparison circuit, execution circuit and output circuit. It plays the role of automatic adjustment, safety protection and conversion circuit in the system circuit. The utility model is provided with a first relay 4 and a second relay 20. Relay is an "automatic switch" that uses a small current to control the operation of a large current. Two relays must be configured in a heating unit. The first relay 4 is connected to each monitor and mainly plays the role of connecting the power supply; the second relay 20 is placed between the electrical control cabinet 25 and the flexible electric heating element 1, and is responsible for connecting and blocking the power supply of the heating element to achieve the purpose of automatic heating and snow removal.
[0048] Rail temperature sensor 5: It adopts lead temperature sensor (PT100 and other platinum resistance, thermocouple), waterproof fastening ring, 304 stainless steel probe, temperature-resistant flame-retardant layer, PTFE silver-plated shielded wire, pin-shaped standard terminal, IP68 protection level. It is used to monitor the temperature of the rail after being heated by the flexible electric heating element 1, so as to achieve the purpose of keeping the rail temperature at about 40°C. The rail temperature sensor 5 is generally placed at the lower end of the movable part of the turnout point rail, and is mainly responsible for monitoring the initial rail temperature and the rail temperature after heating, and transmitting the collected data to the electrical control cabinet 25 to prevent the flexible electric heating element 1 from overworking.
[0049] The rail temperature sensor 5 includes a sensor unit 12, a temperature display 17, a fixing nut 18, a temperature measuring rod 19, and a protective shell 14. The temperature measuring rod 19 is fixedly connected to the sensor unit 12 and the temperature display 17 through the fixing nut 18, and the rail temperature sensor 5 is connected to the outside through the signal interface 16. The rail temperature sensor 5 is fixed to the bottom of the railway turnout rail through a metal fixture 11. The metal fixture 11 is an elastic U-shaped structure, and a spring 13 and a pad 15 are arranged on the bottom from bottom to top. The pad 15 is provided with a protective shell 14 of the rail temperature sensor 5, that is, the rail temperature sensor 5 is placed on the pad 15 as a whole. The opening of the metal fixture 11 is provided with a buckle, which is mounted on the base of the railway turnout rail, and the rail temperature sensor 5 and the base of the railway turnout rail are pressed and fitted together by the preset pressing force of the spring 13. The rail temperature sensor 5 can adopt a conventional product in the prior art.
[0050] The flexible electric heating element 1 includes a flexible silicone heating film, which is mainly composed of a nickel-chromium alloy heating wire 47, a distributed capacitance current absorption film 2 and an insulating layer. The heating element is made of a nickel alloy foil, and the insulating layer is a silicone rubber high-temperature insulating cloth 3, which is a thin sheet composited with silicone rubber and glass fiber cloth. The flexible electric heating element 1 is placed at the waist of the rail between the turnout point rail and the movable heart rail, and is fixed by a U-shaped buckle made of metal. After the power is turned on, the flexible electric heating element 1 starts to automatically melt snow. In this embodiment, two layers of insulating layers 3 are arranged on the external surface of the flexible electric heating element 1.
[0051] The flexible electric heating element 1 is designed as an electric heating film in the form of a sandwich structure, mainly composed of three parts: a nickel-chromium alloy heating wire 47, a distributed capacitance current absorption film 2 and a silicone rubber high-temperature insulating cloth 3. The upper and lower layers of the structure adopt a thin sheet composited with a new organic polytetrafluoroethylene waterproof insulation material and glass fiber cloth, and the "sandwich" layer adopts a heating element formed by bonding a nickel-chromium alloy heating wire and a distributed capacitance current absorption film. The new organic polytetrafluoroethylene waterproof and thermal insulation material is evenly applied to the nickel-chromium alloy heating wire by high-pressure spraying, which greatly improves its plasticity, ductility and adaptability, and can fit the snow melting area very well. The nickel-chromium alloy heating wire adopts a grid design, with uniform temperature distribution and remarkable heating effect. It can reach a temperature of about 40°C in less than 2 minutes at a voltage of 5V; the resistance is very stable at room temperature (about 20°C) and high temperature (about 170°C), and its resistance and temperature are highly linearly correlated. It has excellent long-term repeated use performance and continuous use performance under high temperature (about 170°C) and high pressure (20V), and can reach the maximum equilibrium temperature of 45°C within 2 minutes at a voltage of 5V. In addition, this type of heating element can be used under harsh conditions such as high temperature, strong acid and alkali, rain and snow erosion, etc., and has the advantages of fast temperature rise, stable heating, low energy consumption, good waterproofness and low price.
[0052] Connector: The whole body adopts metal structure and SMCM material. The fully wrapped structure makes it extremely airtight and waterproof, which can ensure the integrity of the system and its components under harsh conditions. The connector uses copper material terminal connection method, and the protection level is IP66. The connector is generally placed at the connection between the system and each subcomponent, and plays the role of connecting the power supply between the system and each subcomponent.
[0053] like Fig. 9 As shown, it is a schematic diagram of the structure of the turnout close contact checker, the turnout conversion safety checker: consists of a shell 27, a base 34, a contact mechanism 26, 35, a quick-acting mechanism 33, an indicating rod 32, a shift mark 29, a wire introduction pipe 30, an oil filling hole 31, a roller 36, a starting piece 37 and a guide sleeve 28. The shell is installed on the base 34 and forms a space that can accommodate the quick-acting mechanism 33 and the contact mechanism 26, 35, wherein the quick-acting mechanism 33 includes a quick-acting spindle, and the quick-acting mechanism is installed on the base 34 through the quick-acting spindle, and the lower end of the quick-acting spindle passes through the base and is arranged in the indicating rod 32. The turnout conversion safety checker checks the close contact and repulsion state of the flexible electric heating element 1 between the turnout traction points, and improves the reliability of the monitoring of the turnout accident.
[0054] When the surrounding environment has the conditions for the formation of rain and snow, the flexible electric heating turnout automatic snow melting system of the utility model will start to work. The specific startup method of the flexible electric heating turnout automatic snow melting system of the utility model is: the power supply 21 is introduced into the electrical control cabinet 25 through the power through-line or from the railway line contact network, and after passing through the manual switch or the relevant components of the automatic switch of the electrical control cabinet 25, the power is input to the isolation transformer 24 beside the railway line by the wire 7. The isolation transformer 24 reduces the voltage, converts the current or changes the phase of the power supply and then transmits it to the first relay 4, so that the rain and snow sensor 6 connected to the first relay 4 starts to work.
[0055] When the intelligent microprocessor and induction disk 8 of the rain and snow sensor 6 detect the presence of rain and snow on the railway line, the detected information will be immediately transmitted to the remote intelligent control terminal 22 and the station local control console 23 for processing through the railway signal cable. The operating status of the entire station snow melting system can be viewed at the remote intelligent control terminal 22 and the station local control console 23, and the working parameters of the snow melting system can be set.
[0056] The operation status of the snow melting system of the entire railway station line can be viewed on the remote intelligent control terminal 22, and different degrees of snow melting instructions are issued to the electrical control cabinet 25 according to the changes in the rain and snow environment around the railway line and the rated output voltage index of each subcomponent of the system. After receiving the instructions from the remote intelligent control terminal 22, the electrical control cabinet 25 will be interlocked with the second relay 20, and the heating unit installed at each turnout is connected in parallel with the second relay 20 through the power cable, so that the power supply is connected to the flexible electric heating element 1 and the rail temperature sensor 5.
[0057] When the rain and snow sensor 6 detects that there is snowfall in the surrounding environment, the rain and snow sensor 6 triggers the first relay 4 to turn on the power supply, and the rail temperature sensor 5 detects whether the rail temperature meets the system operation requirements, determines whether the rail needs to be heated, and then outputs a signal to the second relay 20, which starts the flexible electric heating element 1 and starts heating and snow removal. When the overall temperature of the rail rises to 40°C, the rail temperature sensor 5 will feed back data to the remote intelligent control terminal 22, causing the second relay 20 to automatically close, block the current, and stop the flexible electric heating element 1 from heating, thereby realizing the principle of automatic snow removal.
[0058] The nickel-chromium alloy heating wire of the flexible electric heating element 1 starts to melt snow after being energized, and the lead-type temperature sensor probe of the rail temperature monitor is responsible for real-time monitoring the temperature of the heated rail after being energized. When the rail temperature reaches 40°C, or the maximum and minimum values of 40°C are within the range of no more than 2°C, the station local control console 23 will set the power supply voltage output parameter of the electrical control cabinet 25 to AC220V, under the premise of a maximum of no more than 40A, a sinusoidal AC voltage of 1250v50HZ is applied between the thermal conductive nickel-chromium alloy wires of the outer layer of the flexible silicone heating film for 1min, which can make the insulation resistance between the resistance wire and the outer layer of the electric heating element less than 25MΩ. After observing that there is no breakdown of the silicone rubber high-temperature insulating cloth 2 of the flexible silicone heating film, the rated heating power of the flexible silicone heating film is controlled between 200w / m and 600w / m.
[0059] The electric-thermal conversion efficiency of the heating unit composed of the relay, the connector, the wire 7, the rain and snow sensor 6, the rail temperature sensor 5, and the flexible electric heating element 1 is not less than 96%, which can make the rail temperature fluctuate within a small range of about 40°C.
[0060] When there is no rain or snow on the railway line, the rain or snow sensor 6 will send the information that no rain or snow is detected to the electrical control cabinet 25, and the electrical control cabinet will disconnect the interlocking relationship between the second relay 20 and the heating unit through the communication cable, cut off the power supply of the heating unit, and stop the snow melting work of the system, so as to achieve the energy-saving and efficient snow removal purpose of the utility model.
[0061] The utility model solves the drawbacks of traditional turnout snow melting devices, and the automatic turnout snow melting system has technical support such as flexible electric heating elements 1, sensor matching methods and improved wiring methods, which can better solve the problem of snow accumulation on turnouts and ensure railway transportation safety.
[0062] Technical advantages of this utility model:
[0063] (1) In order to solve the problem that the heating elements of the snow melting equipment in the industry are difficult to fit with the rails, the utility model uses a flexible silicone electric heating film as a flexible electric heating element. The adhesive layer on its surface can fit the snow melting area very well, so that the heating wire can fully heat the rails. In addition, this type of flexible electric heating element is adaptable to various environments and has excellent plasticity, ductility and adaptability. It also has the advantages of fast temperature rise, stable heating, low energy consumption, good waterproofness and low price.
[0064] (2) In order to solve the problem of sensor coordination detection, the utility model simplifies the overall structure of the system by reconstructing the system circuit coordination. The simple installation method not only ensures that there are no errors in the coordination between the sensors of the system itself, but also prevents the problem of affecting the railway electrical system and various tasks due to overly complicated lines, thereby enhancing the stability of the system in actual use and reducing the waste of electric energy.
[0065] (3) In order to solve the problem of unreasonable circuit topology, the utility model optimizes multiple aspects such as reconstruction of sensor monitoring coordination mode, simplification of circuit equipment, and redesign of heating panel, thereby improving thermal efficiency, reducing energy consumption, and ensuring safe and reliable operation of the system.
[0066] (4) In order to solve the problem that the movable part of the switch rail cannot be closely attached after the snow melting operation is completed, the utility model uses the switch conversion safety confirmation checker to check the movable part of the switch rail in real time after the snow melting operation is completed to ensure that it is closely attached to the switch basic rail.
Claims
1. A flexible electric heating turnout automatic snow melting system, characterized in that: It includes remote intelligent control terminal, electrical control cabinet, first relay, second relay, rain and snow sensor, rail temperature sensor, and flexible electric heating element; The rain and snow sensor, the rail temperature sensor, the flexible electric heating element, the first relay, and the second relay are connected by electric wires to form a heating unit; The first relay is connected to the electrical control cabinet, the rain and snow sensor, and the rail temperature sensor respectively, and plays the role of connecting the power supply; the second relay is placed between the electrical control cabinet and the flexible electric heating element, and is responsible for connecting and disconnecting the power supply of the heating element; The remote intelligent control terminal is connected to the rain and snow sensor and the electrical control cabinet respectively. When the rain and snow sensor detects the presence of rain and snow on the railway line, it will immediately transmit the detected information to the remote intelligent control terminal through the railway signal cable. After receiving the instruction from the remote intelligent control terminal, the electrical control cabinet will be interlocked with the second relay, and the heating unit installed at each switch will be connected in parallel with the second relay through the power cable, so that the power supply is connected to the flexible electric heating element and the rail temperature sensor, and then the snow melting work is carried out.
2. The flexible electric heating turnout automatic snow melting system according to claim 1 is characterized in that: According to the number of turnouts on the railway line, it is divided into multiple local areas, and each area is provided with a heating unit, each of which is connected in parallel and can be independently controlled.
3. The flexible electric heating turnout automatic snow melting system according to claim 1 is characterized in that: It also includes a station local control console, which is connected to the remote intelligent control terminal to form a data communication and control line.
4. The flexible electric heating turnout automatic snow melting system according to claim 1 is characterized in that: The electrical control cabinet is arranged at the turnout throat area on the railway line. The electrical control cabinet is provided with a flexible electric heating element power interface, a rain and snow sensor power interface, a rail temperature sensor power interface, a rain and snow sensor signal interface and a rail temperature sensor display screen to realize the functions of power supply and signal transmission processing for the flexible electric heating element, rain and snow sensor, rail temperature sensor and rain and snow sensor.
5. The flexible electric heating turnout automatic snow melting system according to claim 1 is characterized in that: The flexible electric heating element is composed of a nickel-chromium alloy heating wire, a distributed capacitance current absorption film and an insulating layer, and the insulating layer is a thin sheet composited with silicone rubber and glass fiber cloth.
6. The flexible electric heating turnout automatic snow melting system according to claim 5 is characterized in that: The flexible electric heating element is arranged at the rail waist between the turnout point rail and the movable heart rail, and is fixed by a U-shaped buckle made of metal material.
7. The flexible electric heating turnout automatic snow melting system according to claim 5 is characterized in that: The flexible electric heating element is an electric heating film design composed of a sandwich structure, mainly composed of three parts: nickel-chromium alloy heating wire, distributed capacitance current absorption film and silicone rubber high-temperature insulating cloth. The upper and lower layers of the structure adopt a thin sheet composited with a new organic polytetrafluoroethylene waterproof insulation material and glass fiber cloth, and the "sandwich" layer adopts a heating element composed of nickel-chromium alloy heating wire and distributed capacitance current absorption film.
8. The flexible electric heating turnout automatic snow melting system according to claim 1 is characterized in that: The electric power source is introduced into the electric control cabinet through the power through-line or from the railway line contact network. After passing through the manual switch or automatic switch of the electric control cabinet, the power source is input into the isolation transformer by the wire. The isolation transformer reduces the voltage, converts the current or changes the phase of the power source and then transmits it to the first relay, so that the rain and snow sensor connected to the first relay starts working.
9. The flexible electric heating turnout automatic snow melting system according to claim 1 is characterized in that: When the rain and snow sensor detects that there is snowfall in the surrounding environment, the rain and snow sensor triggers the first relay to turn on the power supply, and the rail temperature sensor detects whether the rail temperature meets the system operation requirements, determines whether the rail needs to be heated, and then outputs a signal to the second relay, which starts the flexible electric heating element to start heating and snow removal.
10. The flexible electric heating turnout automatic snow melting system according to claim 1, characterized in that: When there is no rain or snow on the railway line, the rain or snow sensor will send information indicating that no rain or snow is detected to the electrical control cabinet, and the electrical control cabinet will then disconnect the interlocking relationship between the second relay and the heating unit through the communication cable, cut off the power supply to the heating unit, and stop the snow melting work.