Track turnout snow melting system and method based on PLC control

Abstract

The invention discloses a track turnout snow melting system and method based on PLC control. The track turnout snow melting system comprises a control device and a control assembly installed in the control device. The control device comprises a control cabinet body, the control assembly is installed in the control cabinet body, the control assembly comprises a central processing unit module, and the central processing unit module is connected with a digital quantity input module, a digital quantity output module and a PID control module through signals. The PID control module is used for generating control parameter signals and transmitting the control parameter signals to the central processing unit, and the central processing unit module obtains input signals through the digital quantity input module and outputs control instructions through the digital quantity output module. The heating power and time can be flexibly adjusted according to actual conditions, accurate snow melting is achieved, energy waste is avoided, the system has perfect fault detection and alarm functions, abnormal conditions can be found and handled in time, and the reliability and safety of the turnout snow melting system are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of railway equipment, and in particular to a PLC control-based track turnout snow melting system and method. BACKGROUND

[0002] In a railway transportation system, track turnouts are key equipment for guiding train turning. In winter, due to snowfall and low temperature, snow and ice are likely to accumulate in the track turnout area, causing the track turnout to act and block, and thus affecting the normal operation of the train. If not handled or handled improperly, it may even cause safety accidents. The traditional track turnout snow melting method mainly relies on manual cleaning. However, the large number of track turnouts makes manual cleaning not only labor-intensive, but also has certain safety hazards, and it is difficult to effectively remove snow and ice in bad weather conditions.

[0003] With the continuous development of automation technology, an automatic snow melting system has gradually emerged. However, in the long-term use of the existing automatic snow melting system, it is found that the existing automatic snow melting system has problems of inaccurate control, low intelligentization, poor reliability, etc. The existing automatic snow melting system is difficult to flexibly and efficiently melt snow according to the actual weather and track turnout conditions. SUMMARY

[0004] The present application provides a PLC control-based track turnout snow melting system and method, which can make up for the shortcomings of the prior art and solve at least one technical problem proposed in the background art.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: In a first aspect, the present application provides a PLC control-based track turnout snow melting system, which is connected with a plurality of heating devices, comprising: a control device and a control component installed in the control device; the control device comprises a control cabinet body, the control component is installed in the inside of the control cabinet body, the control component comprises a central processor module, the central processor module is connected with a digital quantity input module, a digital quantity output module and a PID control module through a signal; The PID control module is used to generate a control parameter signal and transmit it to the central processor, the central processor module acquires an input signal through the digital quantity input module, and outputs a control instruction through the digital quantity output module.

[0006] As a further technical solution, the control assembly further comprises a power supply module, a communication module, a temperature control module and a man-machine interaction module; the central processor module is connected with the power supply module through a cable, and the power supply module is used for power supply for the central processor module; the central processor module is connected with the communication module through a signal, and an upper computer is connected with the communication module through the communication module, and is used for monitoring the running state of the central processor module; the central processor module is connected with the temperature control module through a signal, and the temperature control module is used for controlling the heating amount of the heating device.

[0007] As a further technical solution, the side frame of the control cabinet body is rotatably connected with a cabinet door; a plurality of ventilation openings are formed in the side walls of the control cabinet body, and a mounting groove is formed in the bottom of the control cabinet body.

[0008] As a further technical solution, the bottom of the control cabinet body is further connected with a support, a servo motor is fixedly installed on the support, an output end of the servo motor is fixedly connected with a rotating shaft, the rotating shaft penetrates through the mounting groove, and a blade is fixedly connected with the rotating shaft.

[0009] As a further technical solution, a plurality of protective fences are fixedly installed on the inner wall of the mounting groove, and a rain shield is fixedly installed at the top end of the control cabinet body, and the rain shield is inclinedly arranged.

[0010] As a further technical solution, a placing groove is further arranged on the side wall of the control cabinet body, a positioning groove is arranged on the inner wall of the placing groove, and a first magnetic strip is fixedly installed on the inner wall of the positioning groove.

[0011] As a further technical solution, a filter plate is further arranged on the side wall of the control cabinet body, a second magnetic strip is fixedly installed on the filter plate, and the positions of the first magnetic strip and the second magnetic strip correspond to each other; a handle is further fixedly connected with the filter plate.

[0012] In a second aspect, the application provides a PLC control-based track turnout snow melting method based on the PLC control-based track turnout snow melting system of any one of the first aspect. The sensor is used for acquiring the environmental data of the track turnout in real time, and the environmental data is transmitted to the central processor module through the digital input module; the central processor module determines whether the snow melting start condition is met according to the environmental data, and when the snow melting start condition is met, the central processor module outputs the control instruction through the digital output module to start the heating device to melt the track turnout; when the snow melting start condition is not met, the central processor module outputs the control instruction through the digital output module to stop the heating device to melt the track turnout.

[0013] As a further technical solution, the sensor comprises a rain and snow sensor, a temperature sensor and a humidity sensor, and the environmental data are snowfall data, temperature data and humidity data obtained by the rain and snow sensor, the temperature sensor and the humidity sensor respectively.

[0014] As a further technical solution, the snow melting start condition is that when the central processor module detects snowfall according to the environmental data, and the temperature of the track turnout is lower than the preset start temperature in the central processor module and the humidity of the track turnout is higher than the preset start humidity in the central processor module, it is determined that the snow melting start condition is met, otherwise it is determined that the snow melting start condition is not met.

[0015] The one or more technical solutions of the present application have the following beneficial effects: 1. The present application discloses a track turnout snow melting system and method based on PLC control, which can realize accurate snow melting, avoid energy waste, and has perfect fault detection and alarm function, can discover and handle abnormal conditions in time, and ensure the reliability and safety of the turnout snow melting system.

[0016] 2. The control device provided in the present application can effectively take away the heat generated by electrical elements, reduce the temperature inside the control cabinet body, and reduce the performance degradation, shortening of service life, and even damage of elements caused by high temperature. In addition, in a humid environment, condensation is likely to occur inside the control cabinet body, and moisture can damage electrical elements. The air flow formed by the fan can accelerate the discharge of moisture, keep the air inside the control cabinet body dry, and reduce the probability of short circuit, leakage and other faults caused by moisture. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of the present application form part of the present application and serve to provide a further understanding of the present application. The exemplary embodiments of the present application and their descriptions serve to explain the present application, and do not constitute an improper limitation on the present application.

[0018] Figure 1 Fig. 1 is a schematic diagram of the track turnout snow melting system based on PLC control of the present application; Figure 2 Fig. 2 is a flowchart of the track turnout snow melting method based on PLC control of the present application; Figure 3 Fig. 3 is a perspective view of the control device in the track turnout snow melting system based on PLC control of the present application; Figure 4Detail view of the filter plate part in the control device of the present application; Figure 5 Detail view of the blade part in the control device of the present application; Figure 6 Automatic control program screenshot (part) of the central processor (PLC) of the present application; Figure 7 Alarm program screenshot (part) of the central processor (PLC) of the present application; Wherein, 1, control cabinet body; 10, cabinet door; 11, air vent; 12, mounting groove; 13, support; 14, servo motor; 15, rotating shaft; 16, blade; 17, guardrail; 18, rain shield; 2, placing groove; 21, positioning groove; 22, first magnetic stripe; 23, filter plate; 24, second magnetic stripe; 25, handle. DETAILED DESCRIPTION

[0019] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0020] Example 1 In this embodiment, a PLC control-based track turnout snow melting system is provided, which is used to control the heating equipment to melt snow on the track turnout, so the snow melting system is connected with a plurality of heating equipment.

[0021] The snow melting system comprises a control device and a control assembly installed inside the control device, wherein the control device comprises a control cabinet body, and the control assembly is installed inside the control cabinet body, as shown in Figure 1 The control assembly comprises a central processor module, a power supply module, a digital quantity input module, a digital quantity output module, a communication module, a temperature control module, a PID control module and a man-machine interaction module, specifically: the central processor module and the power supply module are connected through a cable; the central processor module and the digital quantity input module are connected through a signal; the central processor module and the digital quantity output module are connected through a signal; the central processor module and the communication module are connected through a signal; the central processor module and the temperature control module are connected through a signal; the central processor module and the PID control module are connected through a signal; the central processor module (PLC) and the man-machine interaction module are connected through a signal.

[0022] The central processor module is the core of the PLC, as shown in Figure 6 and Figure 7As shown, the program to be executed is written in advance in the central processor module, the central processor module is responsible for executing the control program written by the user; and the central processor module obtains the input signal through the digital input module, processes the obtained input signal, and outputs the control instruction through the digital output module according to the written program. The power supply module can supply power to the central processing module, and the central processing module can control the output of the current in the power supply module. The digital input module is used to collect digital signals and analog signals, such as the on-off state of the switch, the temperature signal of the temperature sensor and the like, these signals are input into the central processor, and the central processor module makes logical judgment according to these signals. The digital output module is used to output control instructions to control the on-off of external devices, and the output is a digital signal, which can drive the relay, contactor and other elements to control the start and stop of the heating device.

[0023] In this embodiment, the central processor module is connected with the upper computer through the communication module, and the upper computer can be a remote control center and a station control terminal. The upper computer communicates with the central processor module through Ethernet, and is used to monitor the running state of the central processor module, read system data, and send control instructions to the central processor module.

[0024] In this embodiment, the temperature control module is specially used for accurate measurement and control of temperature, which can automatically adjust the power of the heating device according to the set temperature value, so that the temperature is kept within the set range. In the rail turnout snow melting system, the temperature control module obtains the current environment temperature and rail temperature, combines the set temperature value, accurately controls the heating amount of the heating device, and ensures that the temperature of the turnout area is always kept within the appropriate range. The PID control module can obtain the actual output of the system, compare it with the preset setting, and automatically generate control parameters through the deviation between the actual output and the setting, so that the output of the system quickly and stably approaches the setting.

[0025] As shown in Figure 3 , Figure 4 and Figure 5 , the side frame of the control cabinet body 1 is rotatably connected with a cabinet door 10, a plurality of ventilation openings 11 are formed in the side walls of the control cabinet body 1, and a mounting groove 12 is formed in the bottom of the control cabinet body 1. The bottom of the control cabinet body 1 is also connected with a bracket 13, the servo motor 14 is fixedly installed on the bracket 13, the output end of the servo motor 14 is fixedly connected with a rotating shaft 15, the rotating shaft 15 is fixedly connected with a blade 16, a plurality of protective fences 17 are fixedly installed on the inner wall of the mounting groove 12, and a rain shield 18 is fixedly installed at the top end of the control cabinet body 1, and the rain shield 18 is inclined.

[0026] When working, the control cabinet body 1 can simultaneously coordinate control of multiple heating devices. For example, the control components inside the control cabinet body 1 can control the start, stop and heating power adjustment of multiple heating devices, ensure that each key position of the turnout, such as the point rail and the center rail, can be properly heated, and realize uniform snow melting. At the same time, other related equipment, such as power equipment and alarm devices, can be uniformly managed and controlled. The control components inside the control cabinet body 1 can be protected through the cabinet door 10. When the control components inside the control cabinet body 1 are working, they will generate a certain amount of heat. When the temperature inside the control cabinet body 1 reaches a certain temperature, the support 13 can support the servo motor 14. The servo motor 14 is operated, thereby driving the rotating shaft 15 to rotate. The rotating shaft 15 rotates, thereby driving the blade 16 to rotate in the installation groove 12. When the blade 16 rotates to form wind power, the heat can be discharged from the ventilation openings 11 on both sides of the control cabinet body 1. The protective fence 17 can play a protective role, thereby reducing the impact of foreign matter falling into the installation groove 12 on the blade 16. The rain shield 18 can play a role in blocking rain and snow, thereby reducing the amount of rain and snow falling into the control cabinet body 1. This design can effectively remove the heat generated by the control components, reduce the temperature inside the control cabinet body 1, and reduce the performance degradation, shortened service life or even damage of the control components due to high temperature. In addition, in a humid environment, the control cabinet body 1 is prone to condensation. Moisture can damage the control components. The air flow formed by the fan can accelerate the discharge of moisture, keep the air inside the control cabinet body 1 dry, and reduce the probability of short circuit, electric leakage and other faults caused by moisture.

[0027] As shown in Figure 4 The control cabinet body 1 is provided with a placing groove 2 on the side wall on both sides. The inner wall of the placing groove on both sides is provided with a positioning groove 21. The first magnetic strip 22 is fixedly installed on the inner wall of the positioning groove 21. The control cabinet body 1 is further provided with a filter plate 23 on both sides. The second magnetic strip 24 is fixedly installed on the filter plate 23 on both sides. The positions of the first magnetic strip 22 and the second magnetic strip 24 correspond to each other. The connection mode of the first magnetic strip 22 and the second magnetic strip 24 is magnetic connection. The filter plate 23 is further fixedly connected with a handle 25.

[0028] When the ventilation opening 11 is ventilated, the filter plate 23 can play a filtering role, so that the dust and impurities floating into the control cabinet body 1 can reduce the influence on the internal control components, and the handle 25 facilitates the disassembly of the filter plate 23 by the worker, and when the worker approaches the second magnetic strip 24 to the positioning groove 21, the second magnetic strip 24 can be automatically inserted into the positioning groove 21 and connected with the first magnetic strip 22 through the magnetic attraction principle, so that the filter plate 23 can be inserted into the placement groove 2 for installation, and the filter plate 23 can be disassembled by pulling the handle 25, so that the filter plate 23 can play a filtering role when the ventilation opening 11 is ventilated, so that the dust and impurities floating into the control cabinet body 1 can reduce the influence on the control components in the control cabinet body 1, and the worker can conveniently install and disassemble the filter plate 23, so that the worker can conveniently clean the filter plate 23 later.

[0029] Embodiment two The embodiment provides a PLC control-based track turnout snow melting method, and is based on the PLC control-based track turnout snow melting system provided in embodiment one and specifically comprises the following steps. S1: system initialization: turn on the power supply module, start the central processor module (PLC) and the control device, the PLC performs self-checking on each sensor, checks whether the sensor normally works, and presets snow melting control parameters such as a starting temperature, a starting humidity and a stopping temperature threshold.

[0030] S2: data acquisition: real-time acquisition of track turnout environment data is performed through the sensor, and the acquired environment data is transmitted to the central processor module through a digital quantity input module for analysis and processing.

[0031] S3: snow melting control: the central processor module determines whether the snow melting starting condition is met according to the environment data, when the snow melting starting condition is met, the central processor module outputs a control instruction through a digital quantity output module to start the heating device to melt the track turnout. During the snow melting process, real-time monitoring is performed, a remote monitoring terminal and a human-computer interaction touch screen HMI display the running state, temperature and humidity parameters of the system in real time, and an operator can monitor and intervene the system through the remote monitoring terminal or the human-computer interaction touch screen HMI, and when the system appears an abnormal condition, automatic alarm can be performed in time.

[0032] S4: system stop: the sensor real-time acquires the environment data of the track turnout and transmits the environment data to the central processor module for analysis and processing, when the snow melting starting condition is not met, the central processor module outputs a control instruction through a digital quantity output module to stop the heating device to melt the track turnout. The system enters a standby state, continues to monitor the environment parameters of the turnout area in real time, and waits for the next snow melting starting condition to be met.

[0033] In step S2, the sensor includes a rain and snow sensor, a temperature sensor and a humidity sensor, and the environmental data is snowfall data, temperature data and humidity data acquired by the rain and snow sensor, the temperature sensor and the humidity sensor respectively.

[0034] In step S3, the snow melting start condition is that when the central processor module detects snowfall according to the environmental data, and the temperature of the track turnout is lower than the preset start temperature in the central processor module and the humidity of the track turnout is higher than the preset start humidity in the central processor module, it is determined that the snow melting start condition is met, otherwise it is determined that the snow melting start condition is not met.

[0035] It is pointed out in step S3 that during the process of snow melting, real-time monitoring is carried out, specifically, the temperature data collected by the temperature sensor is continuously acquired, and the heating power is adjusted in real time according to the change of the turnout temperature, for example, when the turnout temperature approaches the stop temperature, the heating power is gradually reduced to avoid energy waste caused by excessive heating. And the alarm in step S3 refers to when the system appears abnormal condition, such as sensor failure, heating equipment damage, power failure, PLC triggers the alarm device, at the same time, the alarm information is sent to the upper computer and the man-machine interaction module, reminding the operator to handle in time.

[0036] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A PLC-controlled snow melting system for track switches, wherein the snow melting system is connected to a plurality of heating devices, characterized in that: include: A control device and a control component installed inside the control device; the control device includes a control cabinet body, the control component is installed inside the control cabinet body, the control component includes a central processing unit module, and the central processing unit module is connected to a digital input module, a digital output module and a PID control module via signals; The PID control module is used to generate a control parameter signal and transmit it to the central processing unit. The central processing unit module obtains input signals through the digital input module and outputs control instructions through the digital output module.

2. A PLC-controlled track turnout snow melting system according to claim 1, characterized in that: The control component also includes a power supply module, a communication module, a temperature control module and a human-computer interaction module; the central processing unit module and the power supply module are connected by a cable, and the power supply module is used to power the central processing unit module; the central processing unit module and the communication module are connected by signals, and are connected to a host computer through the communication module for monitoring the operating status of the central processing unit module; the central processing unit module and the temperature control module are connected by signals, and the temperature control module is used to control the heating amount of the heating equipment.

3. The PLC-controlled track turnout snow melting system according to claim 1, characterized in that: A cabinet door is rotatably connected to one side frame of the control cabinet body; multiple groups of ventilation holes are provided on the side walls on both sides of the control cabinet body, and a mounting groove is provided at the bottom of the control cabinet body.

4. A PLC-controlled track turnout snow melting system as claimed in claim 3, characterized in that: The bottom of the control cabinet body is also connected to a bracket, a servo motor is fixedly mounted on the bracket, an output end of the servo motor is fixedly connected to a rotating shaft, the rotating shaft passes through the mounting slot, and a blade is fixedly connected to the rotating shaft.

5. The PLC-controlled track switch snow melting system according to claim 3, characterized in that: A plurality of guardrails are fixedly mounted on the inner wall of the mounting groove, and a rain shield is fixedly mounted on the top of the control cabinet body, and the rain shield is arranged at an angle.

6. The PLC-controlled track switch snow melting system according to claim 3, characterized in that: The side walls on both sides of the control cabinet body are further provided with placement grooves, the inner walls of the placement grooves on both sides are provided with positioning grooves, and the inner walls of the positioning grooves are fixedly installed with first magnetic strips.

7. The PLC-controlled track switch snow melting system according to claim 3, characterized in that: Filter plates are also provided on both sides of the control cabinet body. Second magnetic strips are fixedly installed on the filter plates on both sides, and the positions of the first magnetic strips and the second magnetic strips correspond to each other; a handle is also fixedly connected to the filter plates.

8. A method for using a PLC-controlled rail turnout snow melting system, based on the PLC-controlled rail turnout snow melting system according to any one of claims 1 to 6, characterized in that: include: Acquire the environmental data of the track switch in real time through the sensor, and transmit the environmental data to the central processing module through the digital input module; The central processing unit module determines whether the snow melting start conditions are met based on the environmental data. When the snow melting start conditions are met, the central processing unit module outputs a control instruction through the digital output module to start the heating equipment to melt snow on the track switch; when the snow melting start conditions are not met, the central processing unit module outputs a control instruction through the digital output module to stop the heating equipment from melting snow on the track switch.

9. A PLC-controlled track turnout snow melting system as claimed in claim 8, characterized in that: The sensors include a rain and snow sensor, a temperature sensor, and a humidity sensor, and the environmental data are snowfall data, temperature data, and humidity data respectively acquired by the rain and snow sensor, the temperature sensor, and the humidity sensor.

10. The PLC-controlled track turnout snow melting system according to claim 8, characterized in that: The snow melting start condition is: when the central processing unit module detects snowfall based on environmental data, and the track switch temperature is lower than the start temperature preset in the central processing unit module and the track switch humidity is higher than the start humidity preset in the central processing unit module, it is determined that the snow melting start condition is met; otherwise, it is determined that the snow melting start condition is not met.

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