A starting control device of an electric heating turnout snow melting system

Abstract

The application discloses a kind of starting control device of electric heating turnout snow melting system, including single-chip microcomputer U1;Single-chip microcomputer U1's PD4, PD5 and PD7 end respectively with the contact 1, 2 and 3 of rotary switch S1 corresponding interface;U1 and watchdog chip IC1 interface;U1 and crystal oscillator Y1 interface;U1's PA0, PA1 and PA2 end, respectively with the one end of resistance R2-R4 corresponding interface;The other end of resistance R2-R4, respectively with optocoupler U4-U6 corresponding interface;Optocoupler U4-U6 respectively with relay J1-J3 corresponding interface;Optocoupler U6 also with relay J5 interface;The output end of relay J2 and J3, for with the coil of multiple loop contactor KM1-KM8 in the multiple electric heating snow melting circuit of electric heating turnout snow melting system original on corresponding interface.The application can safely, reliably ensure real-time starting its electric heating snow melting circuit, guarantee the operation safety of rail transit.

Description

Technical Field

[0001] This invention relates to the field of rail transit technology, and in particular to a start-up control device for an electrically heated turnout snow melting system. Background Technology

[0002] The electric heating turnout snow melting system is an important component of turnout switching equipment. When snowfall or temperature changes occur, the system melts the snow and ice on the turnout switching parts by activating its electric heating snow melting circuit (i.e., heating circuit), thereby ensuring the normal switching of the turnout in winter.

[0003] However, the existing electric heating turnout snow melting system has poor operational reliability and cannot safely and reliably guarantee the real-time activation (e.g., real-time activation via manual or automatic means) of its electric heating snow melting circuit (i.e., heating circuit), thus affecting the operational safety of rail transit.

[0004] Therefore, there is an urgent need to develop a technology that can solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to address the technical deficiencies of existing technologies by providing a start-up control device for an electrically heated turnout snow melting system.

[0006] Therefore, the present invention provides a start-up control device for an electrically heated turnout snow melting system, including a microcontroller U1, a rotary switch S1, a watchdog chip IC1, a crystal oscillator Y1, optocouplers U4~U6, relays J1~J3 and J5, resistors R2~R4, and relays JA1~JA8.

[0007] The three VCC terminals of the microcontroller U1 are connected to the DC power supply VCC1;

[0008] The PD4, PD5, and PD7 terminals of the microcontroller U1 are connected to contacts 1, 2, and 3 of the rotary switch S1, respectively.

[0009] The microcontroller U1 is connected to the watchdog chip IC1;

[0010] The microcontroller U1 is connected to the crystal oscillator Y1;

[0011] The PA0, PA1, and PA2 terminals of the microcontroller U1 are respectively connected to one end of resistors R2 to R4;

[0012] The other ends of resistors R2~R4 are connected to optocouplers U4~U6 respectively;

[0013] Optocouplers U4~U6 are connected to relays J1~J3 respectively;

[0014] Optocoupler U6 is also connected to relay J5;

[0015] The output terminals of relays J2 and J3 are used to connect to the coils of multiple circuit contactors KM1~KM8 in the existing multiple electric heating snow melting circuits of the electric heating turnout snow melting system.

[0016] As can be seen from the technical solution provided by the present invention above, compared with the prior art, the present invention provides a start-up control device for an electric heating turnout snow melting system. Its design is scientific and can safely and reliably ensure the real-time start-up (e.g., real-time start-up through manual or automatic means) of its electric heating snow melting circuit (i.e., heating circuit), thereby ensuring the safe operation of rail transit and having significant practical significance.

[0017] The present invention adopts a modular integration approach, thereby reducing the overall types and number of components of the device that need to be placed in the snow melting control cabinet, reducing wiring, lowering the failure rate, and enabling manual and automatic control of the start-up operation of the electric heating snow melting circuit (i.e., heating circuit), making it safer, more reliable, more efficient, and more suitable for field application and maintenance.

[0018] After testing, the circuit provided by this invention is a highly practical, safe, and stable interface circuit that can be reliably applied to turnout snow melting system equipment in the railway industry. Attached Figure Description

[0019] Figure 1 Electrical schematic diagram of the first part of the start-up control device for an electrically heated turnout snow melting system provided by the present invention;

[0020] Figure 2 Electrical schematic diagram of the second part of the start-up control device for an electrically heated turnout snow melting system provided by the present invention;

[0021] Figure 3 Electrical schematic diagram of the third part of the start-up control device for an electrically heated turnout snow melting system provided by the present invention;

[0022] Figure 4 Electrical schematic diagram of the fourth part of the start-up control device for an electrically heated turnout snow melting system provided by the present invention;

[0023] Figure 5 Electrical schematic diagram of the fifth part of the start-up control device for an electrically heated turnout snow melting system provided by the present invention;

[0024] From the above Figures 1 to 5 The complete electrical schematic diagram of the start-up control device of the electric heating turnout snow melting system provided by the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] See Figures 1 to 5 The present invention provides a start-up control device for an electric heating turnout snow melting system, which is applied to the electric heating turnout snow melting system;

[0029] The start control device includes a microcontroller U1, a rotary switch S1, a watchdog chip (i.e., a microprocessor monitor) IC1, a crystal oscillator Y1, optocouplers U4~U6, relays J1~J3 and J5, resistors R2~R4, and relays JA1~JA8.

[0030] The three VCC terminals of the microcontroller U1 (i.e., pins 5, 17, and 38) are connected to the DC power supply VCC1 (+5V);

[0031] The PD4, PD5, and PD7 pins (i.e., pins 13, 14, and 16) of the microcontroller U1 are connected to contacts 1, 2, and 3 of the rotary switch S1, respectively.

[0032] It should be noted that the PD4, PD5 and PD7 terminals of the microcontroller U1 represent the automatic mode, manual mode and lockout mode of the system, respectively, and correspond to contacts 1, 2 and 3 of the rotary switch S1.

[0033] The microcontroller U1 is connected to the watchdog chip (i.e., the microprocessor monitor) IC1;

[0034] The microcontroller U1 is connected to the crystal oscillator Y1;

[0035] The PA0, PA1, and PA2 terminals of the microcontroller U1 (i.e., pins 37, 36, and 35) are connected to resistors R2 to R4 respectively (see... Figure 2 One end of the two terminals (as shown) should be connected to the other end of the other terminal.

[0036] The other ends of resistors R2~R4 are connected to optocouplers U4~U6 respectively;

[0037] Optocouplers U4~U6 are connected to relays J1~J3 respectively;

[0038] Optocoupler U6 is also connected to relay J5;

[0039] The output terminals of relays J2 and J3 are used to connect to the coils of multiple (specifically, 8) circuit contactors KM1~KM8 in the existing multiple (specifically, 8) electric heating snow melting circuits on the electric heating turnout snow melting system.

[0040] In this invention, specifically, relay J1 is connected to interface JS3;

[0041] Relay J1 is connected to the programmable logic controller (PLC) on the original control cabinet of the external electric heating turnout snow melting system via interface JS3.

[0042] It should be noted that in this invention, relay J1 returns a switching signal to the programmable controller PLC on the original control cabinet of the external electric heating turnout snow melting system through interface JS3.

[0043] In this invention, specifically, the programmable logic controller (PLC) on the original control cabinet of the external electric heating turnout snow melting system is connected to the signal control terminals of relays JA1 to JA8.

[0044] The output terminals of relays JA1 to JA8 are used to connect to the coils of circuit contactors KM1 to KM8 in the original eight heating circuits of the external electric heating turnout snow melting system (i.e., the original eight electric heating snow melting circuits on the electric heating turnout snow melting system).

[0045] It should be noted that each heating circuit has a circuit contactor for controlling whether the power is on or off. The original eight heating circuits of the electric heating turnout snow melting system located outside the circuit each have circuit contactors KM1 to KM8.

[0046] It should also be noted that in this invention, the programmable logic controller (PLC) on the original control cabinet of the external electric heating turnout snow melting system controls the contactors KM1 to KM8 of the eight heating circuits (i.e., the original eight electric heating snow melting circuits on the electric heating turnout snow melting system) through eight relays JA1 to JA8, thereby controlling the enabling (enabling, i.e., input and output, i.e., energizing and conducting) of these eight heating circuits.

[0047] Relay J2 has four outputs, which are respectively connected to the two ends of the coils of four circuit contactors KM1~KM4;

[0048] Relay J3 has four outputs, which are respectively connected to the two ends of the coils of four circuit contactors KM5~KM8;

[0049] It should be noted that when relays J2 and J3 are successively energized, the eight circuit contactors KM1 to KM8 will be successively closed due to the conductivity of their coils, thus effectively enabling the heating.

[0050] In this invention, specifically, the three GND terminals of the microcontroller U1 (i.e., pins 6, 18 and 39) are connected to the power ground terminal GND.

[0051] In this invention, specifically regarding the connection between the microcontroller U1 and the crystal oscillator Y1, the specific circuit structure design is as follows:

[0052] The X1 pin (pin 8) of the microcontroller U1 is connected to one end of the crystal oscillator Y1 and one end of the capacitor C13, respectively.

[0053] The X2 pin (pin 7) of the microcontroller U1 is connected to the other end of the crystal oscillator Y1 and one end of the capacitor C12, respectively.

[0054] The other ends of capacitors C12 and C13 are connected to the power supply ground terminal GND.

[0055] In this invention, specifically, the PB0 terminal (i.e., pin 40) of the microcontroller U1 is connected to the cathode of the diode RUN and one end of the resistor R35, respectively.

[0056] After the anode of diode RUN and the other end of resistor R35 intersect at the bus, they are connected to one end of resistor R33.

[0057] The other end of resistor R33 is connected to DC power supply VCC1 (+5V).

[0058] In this invention, specifically regarding the connection between the microcontroller U1 and the watchdog chip IC1 (i.e., the microprocessor monitor), the specific circuit structure design is as follows:

[0059] The RESET pin (pin 4) of the microcontroller U1 is connected to one RESET pin (pin 7) of the watchdog chip IC1 and one end of the resistor R37.

[0060] The other end of resistor R37 is connected to DC power supply VCC1 (+5V);

[0061] The WDO terminal (pin 8) of the watchdog chip IC1 is also connected to the MR terminal (pin 1) of the watchdog chip IC1 itself;

[0062] The V terminal (pin 2) of the watchdog chip IC1 is connected to the DC power supply VCC1 (+5V);

[0063] After the GND terminal (pin 3) and PEI terminal (pin 4) of the watchdog chip IC1 intersect, they are connected to the power ground terminal GND.

[0064] The WDI pin (pin 6) of the watchdog chip IC1 is connected to the PB0 pin (pin 40) of the microcontroller U1.

[0065] In this invention, the watchdog chip IC1 is a mature electronic component with existing technology; for example, the MAX705ESA watchdog chip IC manufactured by Maxim Integrated can be used. The watchdog chip IC forms a monitoring circuit that can monitor the operating status of the microcontroller U1.

[0066] For watchdog chip IC1, the MR port of the watchdog chip IC is used as a manual reset terminal. When it is pulled low to below 0.8V, the input triggers a reset signal. Its input is active low and has an internal 70uA pull-up current. It can be driven by TTL / CMOS logic lines or shorted to ground by a switch.

[0067] Port V of the watchdog chip IC is used as a +5V power input terminal;

[0068] The GND port of the watchdog chip IC is used as a signal reference ground;

[0069] The PFI pin of the watchdog chip IC is used as the input of the power failure voltage monitor. When the voltage monitor input is below 1.25V, the PFI pin will be LOW. If this pin is not used, PFI can be connected to ground.

[0070] The PFO port of the watchdog chip IC is used as a power failure output terminal, which is high until the PFI terminal drops below 1.25V;

[0071] The WDI port of the watchdog chip IC is used as a watchdog input. If the WDI input remains HIGH or LOW for 1.6 seconds, the internal watchdog timer will overflow, and the WDI pin will go low. Alternatively, the WDI pin can be left floating or connected to a high-impedance trigger buffer to disable the watchdog function. Once reset, and the WDI pin is in a triggered state, or if a rising / falling edge is encountered at the WDI pin, the internal watchdog timer will be cleared to 0.

[0072] The RESET port of the watchdog chip IC is used as a low-level active reset output. When Vcc is lower than the reset threshold, a 200ms low-level pulse will be generated and it will remain low. When Vcc rises above the reset threshold, or after the MR pin rises from LOW to HIGH, it will remain low for 200ms. A watchdog overflow will not trigger RESET unless the WDO pin is connected to the MR pin.

[0073] The WDO port of the watchdog chip IC is used as the watchdog output. When the internal watchdog timer completes a 1.6s count, it will be pulled low; it will not rise until the watchdog is cleared to 0.

[0074] In this invention, specifically, the AFEF terminal (i.e., pin 29) of the microcontroller U1 is connected to the power ground terminal GND through capacitor C11.

[0075] The AGND terminal (pin 28) of the microcontroller U1 is connected to the power ground terminal GND;

[0076] The AVCC terminal (pin 27) of the microcontroller U1 is connected to the DC power supply VCC1 (+5V).

[0077] In this invention, it should be noted that the microcontroller U1 is a mature electronic component with existing technology. For example, the ATMEGA16 microcontroller produced by MICROCHIP can be used.

[0078] In this invention, the ports (PA7-PA0) of the microcontroller U1 serve as the analog input terminals of the A / D converter. These ports (PA7-PA0) are 8-bit bidirectional I / O ports with programmable internal pull-up resistors. Their output buffers have symmetrical drive characteristics, enabling them to output and absorb large currents. When used as inputs, if the internal pull-up resistors are enabled, the port will output current when pulled low by an external circuit. During the reset process, even before the system clock starts oscillating, the ports (PA7-PA0) are in a high-impedance state.

[0079] The ports (PB7~PB0) of the microcontroller U1 are 8-bit bidirectional I / O ports with programmable internal pull-up resistors. Their output buffers have symmetrical drive characteristics, allowing them to output and sink large currents. When used as inputs, if the internal pull-up resistors are enabled, the port will output current when pulled low by an external circuit. During reset, even before the system clock starts oscillating, the ports (PB7~PB0) are in a high-impedance state.

[0080] The ports (PD7-PD0) of the microcontroller U1 are 8-bit bidirectional I / O ports with programmable internal pull-up resistors. Their output buffers have symmetrical drive characteristics, allowing them to output and sink large currents. When used as inputs, if the internal pull-up resistors are enabled, the port will output current when pulled low by an external circuit. During reset, even before the system clock starts oscillating, the ports (PD7-PD0) are in a high-impedance state.

[0081] The RESET port of the microcontroller U1 is a reset input pin. When the input duration exceeds the minimum threshold time of the low level, it will cause the system to reset.

[0082] The XTAL1 port (i.e., X1 terminal) of the microcontroller U1 is the input terminal of the inverting oscillator amplifier and the on-chip clock operation circuit;

[0083] The XTAL2 port (i.e., X2 terminal) of the microcontroller U1 is the output terminal of the inverting oscillator amplifier;

[0084] The AVCC port of the microcontroller U1 is the power input port of the A / D converter inside the microcontroller U1.

[0085] Ports AFEF of microcontroller U1 are the analog reference input pins of the A / D converter inside microcontroller U1.

[0086] In this invention, for specific implementation, see [link to relevant documentation]. Figure 2 The other ends of resistors R2~R4 are connected to pin 2 of optocouplers U4~U6 respectively;

[0087] Pin 1 of optocouplers U4~U6 is connected to DC power supply VCC1 (+5V);

[0088] Pin 4 of optocouplers U4~U6 is connected to DC power supply VCC2 (+24V);

[0089] Among them, pin 3 of optocoupler U4 is connected to the cathode of diode D1 and coil contact 1 of relay J1, respectively;

[0090] After the anode of diode D1 intersects with the coil contact 4 of relay J1, it is connected to the power supply ground terminal GNDA.

[0091] Among them, pin 3 of optocoupler U5 is connected to the cathode of diode D2 and coil contact 1 of relay J2, respectively;

[0092] After the anode of diode D2 intersects with the coil contact 12 of relay J2, it is connected to the power supply ground terminal GNDA.

[0093] Among them, pin 3 of optocoupler U6 is connected to the cathode of diode D3 and coil contact 1 of relay J3, respectively;

[0094] After the anode of diode D3 intersects with the coil contact 12 of relay J3, it is connected to the power supply ground terminal GNDA.

[0095] In specific implementation, for relay J1, contact 6 of relay J1 is connected to DC power supply VCC2 (+24V);

[0096] Contact 7 of relay J1 is connected to terminal CON (specifically 24V CON);

[0097] Contact 5 of relay J1 is connected to pin 3 on interface JS3;

[0098] Contact 8 of relay J1 is connected to the power ground terminal GNDA;

[0099] In specific implementation, for relay J2, contacts 2, 5, 8, and 11 of relay J2, after the current convergence, are connected to terminal 220VL-IN (see also...). Figure 4 (As shown) connected;

[0100] Contacts 10, 9, 3, and 4 of relay J2 are respectively connected to terminals 220VL4, 220VL3, 220VL2, and 220VL1 (see also...) Figure 4 (As shown) connected;

[0101] In specific implementation, for relay J3, contacts 2, 5, 8, and 11 of relay J3, after the current convergence, are connected to terminal 220VL-IN (see also...). Figure 4 (As shown) connected;

[0102] Contacts 10, 9, 3, and 4 of relay J3 are respectively connected to terminals 220VL8, 220VL7, 220VL6, and 220VL5 (see also...). Figure 4 (As shown) connected;

[0103] It should be noted that terminal CON is the GND of 24V; terminal 220VL-IN is the live wire of 220V; terminals 220VL8~220VL1 are the live wires of 220V.

[0104] In practice, the terminal CON (i.e., 24V_CON) is also connected to the coils of relays JA1 to JA8;

[0105] The 220VL-IN terminal is also connected to the normally open contacts of relays JA1 to JA8;

[0106] Terminals 220VL1 to 220VL8 are connected to the normally open contacts of relays JA1 to JA8, respectively.

[0107] The terminals 220VL1~220VL8 are also connected to interface JS6 respectively;

[0108] It should be noted that, in this invention, when the rotary switch S1 is turned to automatic mode, the microcontroller controls the relay J1 to engage. Since the contact 5 of the relay J1 is connected to the third pin on the interface JS3 (i.e., the automatic mode feedback port), the relay J1 returns a switching signal (i.e., automatic mode feedback) to the programmable logic controller (PLC) on the original control cabinet of the electric heating turnout snow melting system. The PLC controls the enable of each circuit, energizing the coils of relays JA1 to JA8, which in turn closes the contacts of relays JA1 to JA8 (i.e., the normally open contacts mentioned above), outputting 220V power. This energizes the coils of the eight circuit contactors KM1 to KM8, thereby connecting the original eight heating circuits of the electric heating turnout snow melting system.

[0109] When the rotary switch S1 is turned to manual mode, relays J2 and J3, controlled by the microcontroller, are successively energized. The four sets of contacts of relays J2 and J3 close, outputting 220V power, which energizes the coils of the four circuit contactors (a total of eight circuit contactors KM1~KM8 are energized), thereby connecting the original eight heating circuits of the electric heating turnout snow melting system.

[0110] It should also be noted that when rotary switch S1 is switched to automatic mode, the microcontroller controls relay J1 to engage. Relay J1 returns a switching signal (i.e., automatic mode feedback) to the programmable logic controller (PLC) on the original control cabinet of the electric heating turnout snow melting system. The PLC enables each circuit, energizing the coils of relays JA1-JA8, closing their normally open contacts, and outputting 220V. This energizes the coils of contactors KM1-KM8, connecting the original eight heating circuits of the electric heating turnout snow melting system. Simultaneously, the coil of relay J5 is energized, closing contacts 3 and 4, and outputting 24V. Contact 4 of relay J5 is connected to the manual mode feedback port (i.e., pin 4) of interface JS3, and relay J5 returns a switching signal (i.e., manual mode feedback) to the PLC.

[0111] In practice, pin 3 of optocoupler U6 is also connected to coil contact 1 of relay J5;

[0112] The coil contact 2 of relay J5 is connected to the power supply ground terminal GNDA;

[0113] Contact 3 of relay J5 is connected to DC power supply VCC2 (+24V);

[0114] Contact 4 of relay J5 is connected to pin 4 (i.e., the MANUAL_MODE terminal) on interface JS3.

[0115] It should be noted that for optocouplers U4~U6, pin 1 is the anode of the primary side, and pin 2 is the cathode of the primary side. When current flows between pin 1 (anode) and pin 2 (cathode), the primary side LED of the optocoupler is turned on. Pin 3 is the emitter of the secondary side, and pin 4 is the collector of the secondary side. When the primary side LED of the optocoupler is turned on, pins 3 and 4 are connected.

[0116] In this invention, for specific implementation, see [link to relevant documentation]. Figure 3 Contact A of rotary switch S1 is connected to DC power supply VCC1 (+5V) and power ground terminal GND respectively.

[0117] It should be noted that in this invention, the rotary switch S1 is a mature electronic component with existing technology. For example, the rotary switch of model SR2611F-0403-38R08-D8 manufactured by Alpha Corporation can be used. The rotary switch S1 can reliably switch between three positions. The contacts 1, 2, and 3 of the rotary switch S1 represent the automatic position, manual position, and locked position, respectively. They are connected to PD4, PD5, and PD7 of the microcontroller U1 to input control signals to the microcontroller U1.

[0118] It should be noted that the electric heating turnout snow melting system in which the heating circuit to be controlled and activated by the device of the present invention is a mature existing snow melting system, such as the RD1 electric heating turnout snow melting system produced by Tianjin Railway Signal Co., Ltd.

[0119] In this invention, for specific implementation, see [link to relevant documentation]. Figure 4 For relays JA1~JA8, each relay JA1~JA8 has a normally open contact connected to terminal 220VL-IN (see also...). Figure 2 (As shown) connected;

[0120] Each of the relays JA1 to JA8 has another normally open contact, which is connected to terminals 220VL1 to 220VL8 respectively (see also...). Figure 2 (As shown) connected;

[0121] The two ends of the coils of relays JA1 to JA8 are respectively connected to the two ends of diodes D5 to D12;

[0122] One end of the coil of relays JA1~JA8 is connected to terminal CON (specifically 24V CON, see [link]). Figure 2 (As shown) connected;

[0123] The other end contacts of the coils of relays JA1~JA8 are respectively connected to the corresponding terminals CRT_K1~CRT_K8;

[0124] It should be noted that in this invention, terminals CRT_K1 to CRT_K8 are connected to the JS5 port and simultaneously to one end of the coils of relays JA1 to JA8. The programmable logic controller (PLC) on the original control cabinet of the electric heating turnout snow melting system sends control signals to terminals CRT_K1 to CRT_K8 (i.e., the signal control terminals of relays JA1 to JA8) in real time according to preset signal transmission rules. This energizes the coils of relays JA1 to JA8, causing the normally open contacts (the actuation output terminals) of relays JA1 to JA8 to close, thereby outputting 220V. This energizes the coils of contactors KM1 to KM8, which then close (specifically, their two normally open contacts close), thus starting the electric heating snow melting circuit.

[0125] It should be noted that, for the present invention, see [link to relevant documentation]. Figure 4 , Figure 5 As shown, the normally open contacts 220VL1~220VL8 of relays JA1~JA8 are connected to ports 1~8 of interface JS6, respectively. Ports 1~8 of interface JS6 are connected to one end of the coil JS6-1~JS6-8 of contactors KM1~KM8, respectively. The other end of the coil of KM1~KM8 is connected to 220VN (i.e., the neutral terminal N of the 220V AC power supply). When the contacts of relays JA1~JA8 are closed, terminals 220VL1~220VL8 output 220V voltage to ports 1~8 of JS6, thereby energizing the coils of contactors KM1~KM8, which in turn closes the normally open contacts of contactors KM1~KM8, connecting the 220V power supply, and ultimately starting the electric heating snow melting circuit (a total of 8 heating circuits).

[0126] For the present invention, see Figure 2 , Figure 5As shown, the normally open contacts 220VL1~220VL8 of relays J2 and J3 are connected to ports 1~8 of interface JS6 respectively. Ports 1~8 of interface JS6 are connected to one end of the coil JS6-1~JS6-8 of contactors KM1~KM8 respectively. The other end of the coil of KM1~KM8 is connected to 220VN (i.e., the neutral terminal N of 220V AC power supply).

[0127] When the normally open contacts of relays J2 and J3 close, the 220V L1~220V L8 terminals output 220V voltage to ports 1~8 of JS6, thereby energizing the coils of contactors KM1~KM8, which in turn causes the normally open contacts of contactors KM1~KM8 to close, thus connecting the 220V power supply and ultimately starting the electric heating snow melting circuit (a total of 8 heating circuits).

[0128] In practice, the two ends of the coil of relay JA1 are also connected to the two ends of a series branch consisting of resistor R20 and light-emitting diode LED1;

[0129] The two ends of the coil of relay JA2 are also connected to the two ends of a series branch consisting of resistor R21 and light-emitting diode LED2;

[0130] The two ends of the coil of relay JA3 are also connected to the two ends of a series branch consisting of resistor R22 and light-emitting diode LED3;

[0131] The two ends of the coil of relay JA4 are also connected to the two ends of a series branch consisting of resistor R23 and light-emitting diode LED4;

[0132] The two ends of the coil of relay JA5 are also connected to the two ends of a series branch consisting of resistor R24 ​​and light-emitting diode LED5;

[0133] The two ends of the coil of relay JA6 are also connected to the two ends of a series branch consisting of resistor R25 and light-emitting diode LED6;

[0134] The two ends of the coil of relay JA7 are also connected to the two ends of a series branch consisting of resistor R26 and light-emitting diode LED7;

[0135] The two ends of the coil of relay JA8 are also connected to the two ends of a series branch consisting of resistor R27 and light-emitting diode LED8.

[0136] To better understand this invention, the technical principle and working mechanism of relay J1 are explained below.

[0137] In this invention, specifically, the relay J1 is a well-known and mature electrical component, such as a power relay manufactured by Panasonic, model ST2-DC24V, which can realize automatic control of the circuit.

[0138] For relay J1, there are two sets of normally open contacts; when normally open contacts 5 and 6 are closed, +24V can be connected and a switch signal is returned to the PLC, representing automatic mode feedback; when normally open contacts 7 and 8 are closed, 24V_CON (i.e., 24V ground) can be connected.

[0139] The function of relay J1 is to return a switching signal to the PLC, which then controls the enable of each circuit to activate relays JA1 to JA8.

[0140] To better understand this invention, the technical principle and working mechanism of relay J2 are explained below.

[0141] In this invention, specifically, the relay J2 is a well-known and mature electrical component, such as a power relay manufactured by Panasonic, model S4EB-24V, which can realize automatic control of the circuit.

[0142] For relay J2, it has four sets of normally open contacts; among them, contacts 2, 5, 8, and 11 of relay J2, after the current bus intersects, are connected to terminal 220VL-IN (see also...). Figure 4 (As shown); contacts 10, 9, 3, and 4 of relay J2 are connected to terminals 220VL4, 220VL3, 220VL2, and 220VL1 respectively (see also...) Figure 4 (As shown) When the rotary switch S1 is turned to manual mode, the coil of relay J2 is energized and closed by the microcontroller U1. The four normally open contacts of relay J2 close, connecting four sets of 220V power, which energizes the coils of the corresponding four circuit contactors. The circuit contactors are then closed one after another, effectively enabling heating.

[0143] To better understand this invention, the technical principle and working mechanism of relay J3 are explained below.

[0144] In this invention, specifically, the relay J3 is a well-known and mature electrical component, such as a power relay manufactured by Panasonic, model S4EB-24V, which can realize automatic control of the circuit.

[0145] For relay J3, it has four sets of normally open contacts; contacts 2, 5, 8, and 11 of relay J3, after the current convergence, are connected to terminal 220VL-IN (see also...). Figure 4(As shown); contacts 10, 9, 3, and 4 of relay J3 are connected to terminals 220VL4, 220VL3, 220VL2, and 220VL1 respectively (see also...) Figure 4 (As shown) When the rotary switch S1 is turned to manual mode, the coil of relay J3 controlled by the microcontroller U1 is energized and closes. The four normally open contacts of relay J3 close, connecting four sets of 220V power, which energizes the coils of the corresponding four circuit contactors. The circuit contactors close one after another, realizing the effective heating enable.

[0146] To better understand this invention, the technical principles and working mechanisms of relays JA1 to JA8 are explained below.

[0147] In this invention, specifically, the relays JA1 to JA8 are well-known and mature electrical components with existing technology. For example, they can be power relays manufactured by Panasonic, model APAN3124, which can realize automatic control of the circuit.

[0148] One end of the coil of relays JA1~JA8 is connected to 24V_CON, and the other end is the terminal CRT_K1~CRT_K8 (i.e. the signal control terminal of relays JA1~JA8), which is used to connect to interface JS5. The PLC sends automatic control commands to the terminal CRT_K1~CRT_K8 (i.e. the signal control terminal of relays JA1~JA8) through interface JS5.

[0149] To better understand this invention, the technical principle and working mechanism of relay J5 are explained below.

[0150] In this invention, specifically, relay J5 is a well-known and mature electrical component, such as a power relay manufactured by Panasonic, model APAN3124, which can realize automatic control of the circuit; contact 4 of relay J5 is connected to the manual mode feedback port (i.e., pin 4) of interface JS3. In manual mode, relay J5 returns a switching quantity (i.e., automatic mode feedback) to PLC.

[0151] To better understand the technical solution of the present invention, the working principle of the present invention is explained below.

[0152] This invention uses a single-chip microcomputer U1 as the core control element to control three pulses, which are output to relays J1, J2 and a relay combination including J3 and J5 respectively.

[0153] I. When the electric heating snow melting circuit (i.e., heating circuit) on the electric heating turnout snow melting system is automatically activated in real time, the specific process is described as follows:

[0154] In this invention, the microcontroller U1 is used to control the relay J1 to engage based on the automatic mode activation trigger signal input by the rotary switch S1 and the manual mode activation trigger signal input by the rotary switch S1. Thus, the relay J1 returns a preset automatic status switch signal (e.g., binary 1) to the programmable controller PLC on the original control cabinet of the external electric heating turnout snow melting system through the interface JS3.

[0155] The programmable logic controller (PLC) receives a preset automatic status switch signal and, according to a preset signal transmission rule (e.g., sending a control signal every half hour), sends a control signal in real time to the signal control terminals of relays JA1 to JA8 in the original electric heating snow melting circuit of the electric heating turnout snow melting system. This energizes relays JA1 to JA8, causing their output terminals to close, which in turn energizes the coils of contactors KM1 to KM8. After the coils are energized, contactors KM1 to KM8 close (specifically, their two normally open contacts close), thereby starting the electric heating snow melting circuit.

[0156] Among them, the programmable logic controller (PLC) is connected to the signal control terminals of relays JA1 to JA8;

[0157] Among them, the relays JA1 to JA8 each have an action output terminal (including two ends), which are respectively connected to the two ends of the coil of the circuit contactor KM1 to KM8 in the eight electric heating snow melting circuits (i.e. heating circuits);

[0158] Among them, the two normally open contacts on the circuit contactors KM1 to KM8 are connected in series in eight electrically heated snow melting circuits (i.e., heating circuits) to control the conduction or disconnection of the electrically heated snow melting circuits (i.e., heating circuits).

[0159] In addition, the programmable logic controller (PLC) is also used to record the working status of the electric heating turnout snow melting system as automatic.

[0160] The specific working process is as follows: Rotary switch S1 is turned to automatic mode (that is, rotary switch S1 is turned to position 1). The microcontroller U1 controls relay J1 to close, and at the same time, relay J1 returns a switching signal to the programmable logic controller (PLC). After receiving the switching signal returned by relay J1, the PLC controls relays JA1 to JA8 to be energized, so that the action output terminals perform a closing action. Since the 8 output terminals on relays JA1 to JA8 are used to connect to the coils of circuit contactors KM1 to KM8 in the 8 heating circuits (that is, the original 8 electric heating snow melting circuits on the electric heating turnout snow melting system), when the PLC controls relays JA1 to JA8 to be energized, the circuit contactors KM1 to KM8 in the 8 heating circuits close one after another, and finally realizes the effective heating enable.

[0161] II. When manually controlling the real-time activation of the electric heating snow melting circuit (i.e., heating circuit) on the electric heating turnout snow melting system, the specific process is described as follows:

[0162] In this invention, the microcontroller U1 is used to send control signals to the signal control terminals of relays J2 and J3 in real time according to the manual mode activation trigger signal input by the rotary switch S1. This causes relays J2 and J3 to close successively after being energized. The energized relays J2 and J3 cause their action output terminals to perform a closing action, thereby energizing the coils of the circuit contactors KM1 to KM8 in the original electric heating snow melting circuit of the electric heating turnout snow melting system. After the coils of circuit contactors KM1 to KM8 are energized, their two normally open contacts close, thereby starting the electric heating snow melting circuit.

[0163] Among them, the microcontroller U1 is connected to the signal control terminals of relays J2 and J3;

[0164] Among them, the eight sets of output terminals shared by relays J2 and J3 are respectively connected to the coils of circuit contactors KM1 to KM8;

[0165] Among them, the two normally open contacts on the circuit contactors KM1 to KM8 are connected in series in eight electric heating snow melting circuits (i.e., heating circuits) to control the conduction or disconnection of the electric heating snow melting circuits (i.e., heating circuits).

[0166] In addition, the microcontroller U1 is also used to control the relay J1 to close according to the manual mode activation trigger signal input by the rotary switch S1. Thus, the relay J1 returns a preset manual state switch signal (e.g., binary 1) through the interface JS3 to the programmable controller PLC on the original control cabinet of the external electric heating turnout snow melting system. The programmable controller PLC is used to record the working status (i.e., manual state) of the electric heating turnout snow melting system.

[0167] The specific working process is as follows: When the rotary switch S1 is turned to manual mode, the relays J2 and J3 controlled by the microcontroller U1 are successively energized. Since the 8 output terminals of the relays J2 and J3 are used to connect to the coils of the circuit contactors KM1 to KM8 in the 8 heating circuits (i.e., the original 8 electric heating snow melting circuits on the electric heating turnout snow melting system), when the relays J2 and J3 are successively energized, the coils of the circuit contactors KM1 to KM8 are energized, and the circuit contactors KM1 to KM8 in the 8 heating circuits are successively closed, thus realizing the effective heating enable.

[0168] In this invention, interface JS3 is the manual / automatic status feedback interface on the original control cabinet of the electric heating turnout snow melting system. This interface sends feedback information to the programmable logic controller (PLC) on the control cabinet to monitor the working mode of the control cabinet.

[0169] Interface JS5 is connected to the digital control output terminal of the PLC. When the digital output of the PLC changes, relays JA1 to JA8 are activated. At this time, the coils of all 8 circuit relays are activated, and all 8 heating circuits are turned on.

[0170] It should be noted that, as mentioned earlier, one end of interface JS6 (specifically including ports 1-8) is connected to the normally open contacts 220VL1-220VL8 of relays JA1-JA8, and the other end (specifically including ports 1-8) is connected to one end of the coil JS6-1-JS6-8 of contactors KM1-KM8. The other end of the coil of KM1-KM8 is connected to 220VN (i.e., the neutral terminal N of the 220V AC power supply). When terminals 220VL1-220VL8 output 220V voltage to ports 1-8 of JS6, the coils of contactors KM1-KM8 are energized, causing the normally open contacts of contactors KM1-KM8 to close, thus connecting the 220V power supply and starting the electric heating snow melting circuit.

[0171] In this invention, specifically, interfaces JS5 and JS6 are existing, mature, and well-known electrical components. The interface model is 734-268, and its Chinese name is pin socket. The brand is not limited. It is an electrical connector used for connecting electrical components and plays a role in signal transmission.

[0172] In this invention, specifically, the JS3 interface is a well-established and known electrical component with mature technology. The model number of the JS3 interface is 734-264, and its Chinese name is pin socket. The brand is not limited. It is an electrical connector used for connecting electrical components and plays a role in signal transmission.

[0173] Furthermore, it should be noted that the functions implemented by the device provided by the present invention include: acquiring the status of the three-position switch (corresponding to contacts 1, 2 and 3 of the rotary switch S1), relay control, and providing status information feedback to the PLC.

[0174] Furthermore, the power supply for the device of the present invention is DC 24V, and the present invention outputs corresponding actions to be executed according to the state of the three-position switch.

[0175] The device of this invention does not require a high acquisition rate from the microcontroller and uses few I / O ports. Therefore, the microcontroller can be an ATEMGA16 controller, which is inexpensive and has 32 I / O ports and 4 timers, which can fully meet the requirements of this solution.

[0176] In specific implementation, this invention uses a microcontroller U1 to dynamically and cyclically scan the three-position switch status information output by the rotary switch S1, and the operation of the button (i.e., the rotary switch S1). This does not affect the normal operation of other corresponding actions.

[0177] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A start-up control device for an electrically heated turnout snow melting system, characterized in that, Includes microcontroller U1, rotary switch S1, watchdog chip IC1, crystal oscillator Y1, optocouplers U4~U6, relays J1~J3 and J5, resistors R2~R4, and relays JA1~JA8; The three VCC terminals of the microcontroller U1 are connected to the DC power supply VCC1; The PD4, PD5, and PD7 terminals of the microcontroller U1 are connected to contacts 1, 2, and 3 of the rotary switch S1, respectively. The microcontroller U1 is connected to the watchdog chip IC1; The microcontroller U1 is connected to the crystal oscillator Y1; The PA0, PA1, and PA2 terminals of the microcontroller U1 are respectively connected to one end of resistors R2 to R4; The other ends of resistors R2~R4 are connected to optocouplers U4~U6 respectively; Optocouplers U4~U6 are connected to relays J1~J3 respectively; Optocoupler U6 is also connected to relay J5; The output terminals of relays J2 and J3 are used to connect to the coils of multiple circuit contactors KM1~KM8 in the original multiple electric heating snow melting circuits of the electric heating turnout snow melting system. Relay J1 is connected to the programmable logic controller (PLC) on the original control cabinet of the external electric heating turnout snow melting system via interface JS3. The programmable logic controller (PLC) on the original control cabinet of the external electric heating turnout snow melting system is connected to the signal control terminals of relays JA1 to JA8. The output terminals of relays JA1 to JA8 are used to connect to the coils of the circuit contactors KM1 to KM8 in the original eight electric heating snow melting circuits of the external electric heating turnout snow melting system.

2. The start-up control device for the electric heating turnout snow melting system as described in claim 1, characterized in that, Relay J2 has four outputs, which are respectively connected to the two ends of the coils of four circuit contactors KM1~KM4; Relay J3 has four outputs, which are respectively connected to the two ends of the coils of four circuit contactors KM5~KM8.

3. The start-up control device for the electric heating turnout snow melting system as described in claim 1, characterized in that, Regarding the connection between the microcontroller U1 and the crystal oscillator Y1, the specific circuit structure design is as follows: The X1 terminal of the microcontroller U1 is connected to one end of the crystal oscillator Y1 and one end of the capacitor C13, respectively. The X2 terminal of the microcontroller U1 is connected to the other end of the crystal oscillator Y1 and one end of the capacitor C12, respectively. The other ends of capacitors C12 and C13 are connected to the power supply ground terminal GND.

4. The start-up control device for the electric heating turnout snow melting system as described in claim 1, characterized in that, The PB0 terminal of the microcontroller U1 is connected to the cathode of the diode RUN and one end of the resistor R35, respectively. After the anode of diode RUN and the other end of resistor R35 intersect at the bus, they are connected to one end of resistor R33. The other end of resistor R33 is connected to DC power supply VCC1; The AFEF pin of the microcontroller U1 is connected to the power ground terminal GND through capacitor C11; The AGND terminal of the microcontroller U1 is connected to the power ground terminal GND; The AVCC terminal of the microcontroller U1 is connected to the DC power supply VCC1.

5. The start-up control device for the electric heating turnout snow melting system as described in claim 1, characterized in that, Regarding the connection between the microcontroller U1 and the watchdog chip IC1, the specific circuit structure design is as follows: The WDO pin of the microcontroller U1 is connected to a RESET pin of the watchdog chip IC1 and one end of the resistor R37, respectively. The V terminal of resistor R37 is connected to the DC power supply VCC1; The other RESET terminal of the watchdog chip IC1 is also connected to the V terminal of the watchdog chip IC1 itself; The MR terminal of the watchdog chip IC1 is connected to the DC power supply VCC1; After the busbars intersect, the GND and PEI terminals of the watchdog chip IC1 are connected to the power ground terminal GND. The WDI pin of the watchdog chip IC1 is connected to the PB0 pin of the microcontroller U1.

6. The start-up control device for the electric heating turnout snow melting system as described in claim 1, characterized in that, The other ends of resistors R2~R4 are connected to pin 2 of optocouplers U4~U6 respectively; Pin 1 of optocouplers U4~U6 is connected to DC power supply VCC1 respectively; Pin 4 of optocouplers U4~U6 is connected to DC power supply VCC2 respectively; Among them, pin 3 of optocoupler U4 is connected to the cathode of diode D1 and coil contact 1 of relay J1, respectively; After the anode of diode D1 intersects with the coil contact 4 of relay J1, it is connected to the power supply ground terminal GNDA. Among them, pin 3 of optocoupler U5 is connected to the cathode of diode D2 and coil contact 1 of relay J2, respectively; After the anode of diode D2 intersects with the coil contact 12 of relay J2, it is connected to the power supply ground terminal GNDA. Among them, pin 3 of optocoupler U6 is connected to the cathode of diode D3 and coil contact 1 of relay J3, respectively; After the anode of diode D3 intersects with the coil contact 12 of relay J3, it is connected to the power supply ground terminal GNDA. Among them, pin 3 of optocoupler U6 is also connected to coil contact 1 of relay J5; The coil contact 2 of relay J5 is connected to the power supply ground terminal GNDA; Contact 3 of relay J5 is connected to DC power supply VCC2; Contact 4 of relay J5 is connected to pin 4 on interface JS3.

7. The start-up control device for the electric heating turnout snow melting system as described in claim 1, characterized in that, For relay J1, contact 6 of relay J1 is connected to DC power supply VCC2; Contact 7 of relay J1 is connected to terminal CON; Contact 5 of relay J1 is connected to pin 3 on interface JS3; Contact 8 of relay J1 is connected to the power supply ground terminal GNDA; For relay J2, contacts 2, 5, 8 and 11 of relay J2 are connected to terminal 220VL-IN after the busbars intersect; Contacts 10, 9, 3 and 4 of relay J2 are connected to terminals 220VL4, 220VL3, 220VL2 and 220VL1 respectively; For relay J3, contacts 2, 5, 8 and 11 of relay J3 are connected to terminal 220VL-IN after the busbars intersect. Contacts 10, 9, 3 and 4 of relay J3 are connected to terminals 220VL8, 220VL7, 220VL6 and 220VL5 respectively; The normally open contacts 220VL1~220VL8 of relays J2 and J3 are connected to ports 1~8 of interface JS6 respectively. Ports 1~8 of JS6 are connected to one end of the coil JS6-1~JS6-8 of contactors KM1~KM8 respectively. The other end of the coil of KM1~KM8 is connected to the neutral terminal 220VN of 220V AC power supply.

8. The start-up control device for the electric heating turnout snow melting system as described in claim 1, characterized in that, For relays JA1~JA8, each relay JA1~JA8 has a normally open contact that is connected to the 220VL-IN terminal. Each of the relays JA1 to JA8 has another normally open contact, which is connected to the terminals 220VL1 to 220VL8 respectively. The two ends of the coils of relays JA1 to JA8 are respectively connected to the two ends of diodes D5 to D12; One end of the coil of relays JA1~JA8 is connected to the terminal CON respectively; The other end contacts of the coils of relays JA1~JA8 are respectively connected to the corresponding terminals CRT_K1~CRT_K8; Among them, the two ends of the coil of relay JA1 are also connected to the two ends of the series branch composed of resistor R20 and light-emitting diode LED1; The two ends of the coil of relay JA2 are also connected to the two ends of a series branch consisting of resistor R21 and light-emitting diode LED2; The two ends of the coil of relay JA3 are also connected to the two ends of a series branch consisting of resistor R22 and light-emitting diode LED3; The two ends of the coil of relay JA4 are also connected to the two ends of a series branch consisting of resistor R23 and light-emitting diode LED4; The two ends of the coil of relay JA5 are also connected to the two ends of a series branch consisting of resistor R24 ​​and light-emitting diode LED5; The two ends of the coil of relay JA6 are also connected to the two ends of a series branch consisting of resistor R25 and light-emitting diode LED6; The two ends of the coil of relay JA7 are also connected to the two ends of a series branch consisting of resistor R26 and light-emitting diode LED7; The two ends of the coil of relay JA8 are also connected to the two ends of a series branch consisting of resistor R27 and light-emitting diode LED8; The CON terminal is also connected to the coils of relays JA1 to JA8; The 220VL-IN terminal is also connected to the normally open contacts of relays JA1 to JA8; Terminals 220VL1 to 220VL8 are connected to the normally open contacts of relays JA1 to JA8, respectively. Terminals 220VL1 to 220VL8 are also connected to interface JS6. The normally open contacts 220VL1~220VL8 of relays JA1~JA8 are connected to ports 1~8 of interface JS6 respectively. Ports 1~8 of interface JS6 are connected to one end of the coil JS6-1~JS6-8 of contactor KM1~KM8 respectively. The other end of the coil of KM1~KM8 is connected to the neutral terminal 220VN of 220V AC power supply.

9. The start-up control device for the electric heating turnout snow melting system as described in any one of claims 1 to 8, characterized in that, The microcontroller U1 is used to control the relay J1 to close based on the automatic mode activation trigger signal input by the rotary switch S1. The relay J1 then returns a preset automatic status switch signal to the programmable controller PLC on the original control cabinet of the external electric heating turnout snow melting system through the interface JS3. The programmable logic controller (PLC) is used to receive preset automatic status switch signals and, according to preset signal transmission rules, send control signals in real time to the signal control terminals of relays JA1 to JA8 in the original electric heating snow melting circuit of the electric heating turnout snow melting system. This causes relays JA1 to JA8 to be energized, causing their output terminals to close, which in turn energizes the coils of circuit contactors KM1 to KM8. After the coils are energized, circuit contactors KM1 to KM8 close, thereby starting the electric heating snow melting circuit. Among them, the programmable logic controller (PLC) is connected to the signal control terminals of relays JA1 to JA8; Among them, the action output terminals of relays JA1 to JA8 are respectively connected to the two ends of the coils of circuit contactors KM1 to KM8 in eight hot snow melting circuits; Among them, the two normally open contacts on the circuit contactors KM1 to KM8 are connected in series in eight heating and snow melting circuits respectively, and are used to control the conduction or disconnection of the electric heating and snow melting circuits.

10. The start-up control device for the electric heating turnout snow melting system as described in any one of claims 1 to 8, characterized in that, The microcontroller U1 is used to send control signals to the signal control terminals of relays J2 and J3 in real time according to the manual mode activation trigger signal input by rotary switch S1. This causes relays J2 and J3 to close successively after being energized. The energized relays J2 and J3 cause their action output terminals to close, which in turn energizes the coils of the circuit contactors KM1 to KM8 in the original electric heating snow melting circuit of the electric heating turnout snow melting system. After the circuit contactors KM1 to KM8 are energized, they close, thereby starting the electric heating snow melting circuit. Among them, the microcontroller U1 is connected to the signal control terminals of relays J2 and J3; Among them, the eight sets of output terminals shared by relays J2 and J3 are respectively connected to the coils of circuit contactors KM1 to KM8; Among them, the two normally open contacts on the circuit contactors KM1 to KM8 are connected in series in eight electric heating snow melting circuits to control the conduction or disconnection of the electric heating snow melting circuits.

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