Pulverized coal scale redundant hot standby system
By introducing a redundant thermal backup system into the pulverized coal scale, each motor can be powered independently by a dual-circuit and monitored in real time. This solves the problem of production line shutdown caused by inverter failure and improves the continuity of the production line and maintenance efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-30
- Publication Date
- 2026-04-03
AI Technical Summary
The malfunction of pulverized coal scales in cement production lines can cause production line shutdowns, especially when the frequency converter and setpoint converter are damaged, resulting in inaccurate control and fault detection. In addition, the modules generate a lot of heat and the heat dissipation is uneven, which affects production efficiency.
A redundant hot standby system is adopted, including redundant power supplies for the weighing instrument, redundant power supplies for the frequency converter, Schenker modules, PLC system, etc., to achieve independent dual-circuit power supply for each motor, real-time monitoring and switching of backup circuits to ensure stable system operation.
It effectively solves the production stoppage problem caused by pulverized coal scale control system failure and circuit failure, improves the continuity of the production line and maintenance efficiency, and reduces downtime.
Smart Images
Figure CN224083433U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of redundant thermal backup technology, and in particular to a redundant thermal backup system for pulverized coal scales. Background Technology
[0002] Coal powder scales are one of the important pieces of equipment in cement production lines. With increasingly stringent requirements for production continuity, any malfunction or stoppage of any coal powder scale will severely impact production efficiency and cause significant losses.
[0003] In particular, the inverter and setpoint converter of the pulverized coal scale are more likely to be damaged. Since the integrated inverter uses a 24V power supply, if the AC380V to DC24V transformer inside the inverter's setpoint converter fails, the scale will inevitably trip. Because the on-site inverter does not have an independent motor current output, precise control and fault detection are impossible.
[0004] The field module uses AC220V power, which is converted to DC24V internally via a transformer. Finally, the 24V power is converted to power for the instruments. An internal large-capacity capacitor in the rectifier circuit causes the module to generate significant heat, resulting in uneven heat dissipation and preventing long-term operation. Furthermore, the field DISOCONT module cannot record historical faults. If a fault occurs, electrical maintenance personnel must arrive on-site within a very short time to inspect and troubleshoot, severely wasting repair time. Utility Model Content
[0005] To address or partially address the problems existing in related technologies, this application provides a redundant thermal backup system for pulverized coal scales, aiming to solve the production line shutdown problem caused by pulverized coal scale failures.
[0006] This application provides a redundant thermal backup system for pulverized coal scales, comprising:
[0007] Redundant power supply for weighing instruments, redundant power supply for frequency converters, Schenker modules, PLC system, communication module, central control system, feeding frequency converter group, measuring frequency converter group, agitator drive module, feeding motor group, measuring motor group, agitator motor group, and current transmission system.
[0008] The redundant power supply for the scale instrument is installed on the 220V AC power input line, and the redundant power supply for the scale instrument is connected to the Schenker module and the PLC system.
[0009] The redundant power supply of the frequency converter is installed on the 380V AC power input line. The redundant power supply of the frequency converter is connected to the feeding frequency converter group, the measuring frequency converter group and the agitator drive module. The feeding frequency converter group, the measuring frequency converter group and the agitator drive module are respectively connected to control the feeding motor group, the measuring motor group and the agitator motor group.
[0010] The feeding motor unit, measuring motor unit, and mixing motor unit are all equipped with current transmission systems, which are connected to the Schenck module and PLC system.
[0011] The feeding frequency converter group, the measuring frequency converter group, and the agitator drive module are connected to the Schenck module and the PLC system via communication modules. The Schenck module and the PLC system are connected to the central control system via communication modules.
[0012] Optionally, in some embodiments, the redundant power supply for the scale instrument includes:
[0013] A main power switch Q1 is installed on the 220V AC power input line. The DIN rail type Mean Well switch power supply one U1 and the DIN rail type Mean Well switch power supply two U2 are connected in parallel to the 220V AC power input line behind the main power switch Q1. The power circuit breaker one Q2 is installed on the power line at the front end of the DIN rail type Mean Well switch power supply one U1 and the DIN rail type Mean Well switch power supply two U2.
[0014] The DIN rail type Mean Well switching power supply 3U3 and DIN rail type Mean Well switching power supply 4U4 are connected in parallel and connected to the 220V AC power input line behind the main power switch Q1. The power circuit breaker 2Q3 is installed on the front power line of the DIN rail type Mean Well switching power supply 3U3 and DIN rail type Mean Well switching power supply 4U4.
[0015] The rear ends of the DIN rail type Mean Well switching power supply 1 U1 and DIN rail type Mean Well switching power supply 2 U2 are connected to power redundancy module 1 P1, and the rear ends of the DIN rail type Mean Well switching power supply 3 U3 and DIN rail type Mean Well switching power supply 4 U4 are connected to power redundancy module 2 P2. Power redundancy module 1 P1 and power redundancy module 2 P2 are respectively connected to the Schenker module, the PLC system and the sensor on the coal powder scale for power supply.
[0016] Optionally, in some embodiments, the inverter redundant power supply includes:
[0017] The power input isolating switch QF1 is installed on the 380V AC power line. The power lines at the rear of the power input isolating switch QF1 are connected in parallel and divided into six strands. The load switches QF11, QF12, QF21, QF22, QF31, and QF32 of the measuring motor are respectively installed on the six power lines.
[0018] The six power cables are respectively connected to the feeding frequency converter group, the measuring frequency converter group, and the agitator drive module;
[0019] The Hall current transmitter GB31 is installed on the power supply line at the front end of the first load switch QF31 and the second load switch QF32 of the agitator motor to detect the current of the agitator motor unit.
[0020] Optionally, in some embodiments, each feeder inverter group includes two inverters, the analog signal receiving ends of the two inverters are respectively connected to the drive module of the Schenker module, the pulse signal receiving ends are respectively connected to the PLC system, and the communication interface is connected to the communication end of the Schenker module.
[0021] The U1, V1, and W1 terminals of the two frequency converters are respectively connected to the redundant power supply of the frequency converters. The U2, V2, and W2 terminals of the feeding frequency converter are connected to the DC contactor of the feeding motor relay KM21. The rear end of the feeding motor relay KM21 is connected to the feeding motor of the feeding motor group. The coil terminal of the feeding motor relay KM21 is installed on the feeding frequency converter.
[0022] The front end of the DC contactor of feed motor relay KM22 is connected to the U2, V2, and W2 terminals of feed frequency converter 2, and the rear end is connected to the feed motor of the same feed motor group as feed motor relay KM21.
[0023] The feed motor thermal relay U21 is connected to the Schenker module, the PLC system and the feed frequency converter group respectively. The feed motor thermal resistor T21 is connected to the feed motor thermal relay U21. The feed motor thermal resistor T21 is installed on the feed motor of the feed motor group.
[0024] Optionally, in some embodiments, each of the measurement inverter groups includes two inverters, the analog signal receiving ends of the two inverters are respectively connected to the drive module of the Schenker module, the pulse signal receiving ends are respectively connected to the PLC system, and the communication interface is connected to the communication end of the Schenker module.
[0025] The U1, V1, and W1 terminals of the two frequency converters are respectively connected to the redundant power supply of the frequency converters. The U2, V2, and W2 terminals of the measuring frequency converter are connected to the DC contactor of the measuring motor relay KM11. The rear end of the measuring motor relay KM11 is connected to the feed motor of the measuring motor group. The coil terminal of the measuring motor relay KM11 is installed on the measuring frequency converter.
[0026] The front end of the DC contactor of measuring motor relay 2 KM12 is connected to the U2, V2, and W2 terminals of measuring frequency converter 2, and the rear end is connected to the measuring motor of the same measuring motor group as measuring motor relay 1 KM11.
[0027] The measuring motor thermal relay U11 is connected to the Schenker module, the PLC system, and the measuring frequency converter group. The measuring motor thermal relay U11 is connected to the measuring motor resistance T11, which is installed on the measuring motor of the measuring motor group.
[0028] Optionally, in some embodiments, the stirrer drive module includes:
[0029] Stirring motor relay 1 KM31, stirring motor thermal relay U31, stirring motor resistance temperature detector T31, and stirring motor relay 2 KM32;
[0030] The contactor of the KM31 stirring motor relay is installed on the power input line of the stirring motor unit, and the rear end of the contactor is connected to the stirring motor; the coil of the KM31 stirring motor relay is connected to the motor drive terminal of the Schenker module.
[0031] The thermal relay U31 of the stirring motor is connected to the Schenker module. The thermal resistor T31 of the stirring motor is connected to the thermal relay U31 of the stirring motor. The thermal resistor T31 of the stirring motor is installed on the motor of the stirring motor assembly.
[0032] The KM32 contactor relay for the agitator motor is installed on the power input line of another agitator motor unit in the redundant power supply of the frequency converter. The rear end of the contactor is connected to the agitator motor, and the coil is connected to the PLC system.
[0033] Optionally, in some implementations, the central control system is connected to the network communication port of the Schenker module (3) via a communication module.
[0034] The technical solution provided in this application may include the following beneficial effects:
[0035] Each motor in the pulverized coal scale uses an independent dual-circuit external redundant power supply. The feeding motor and measuring motor are each controlled by two frequency converters, one as the main unit and one as a backup, providing hot standby power. The Schenker module and PLC system monitor and record the status of each motor and frequency converter in real time. If a frequency converter or Schenker module fails, the system switches between frequency converter operation and PLC control. If a circuit in the mixer fails, it automatically switches to another hot standby starting circuit, effectively solving the problem of pulverized coal scale tripping due to control system or circuit failures.
[0036] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description
[0037] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.
[0038] Figure 1 This is a schematic diagram of the redundant thermal standby system for pulverized coal scales shown in the embodiments of this application;
[0039] Figure 2 This is an electrical schematic diagram of the 380V power supply input of the redundant thermal standby system for pulverized coal scale shown in an embodiment of this application;
[0040] Figure 3 This is an electrical schematic diagram of the 220V power supply input of the redundant thermal standby system for pulverized coal scale shown in the embodiments of this application;
[0041] Figure 4 This is a schematic diagram of the measuring motor control circuit of the redundant thermal standby system for pulverized coal scale shown in the embodiments of this application;
[0042] Figure 5 This is a schematic diagram of the measuring motor switching circuit of the redundant thermal standby system for pulverized coal scale shown in an embodiment of this application;
[0043] Figure 6 This is a schematic diagram of the feed motor control circuit of the redundant thermal standby system for pulverized coal scale shown in the embodiments of this application;
[0044] Figure 7 This is a schematic diagram of the feeding motor switching circuit of the redundant thermal standby system for pulverized coal scale shown in the embodiments of this application;
[0045] Figure 8 This is a schematic diagram of the stirring motor control circuit of the redundant thermal standby system for pulverized coal scale shown in the embodiments of this application;
[0046] Figure 9 This is a schematic diagram of the stirring motor switching circuit of the redundant thermal standby system for pulverized coal scale shown in the embodiments of this application;
[0047] Figure 10 This is a schematic diagram of the industrial control system connection of the redundant hot standby system for pulverized coal scale shown in the embodiments of this application.
[0048] Attached reference numerals: 1-Redundant power supply for weighing instrument, 2-Redundant power supply for frequency converter, 3-Schenker module, 4-PLC system, 5-Communication module, 6-Central control system, 7-Feeding frequency converter group, 8-Measuring frequency converter group, 9-Agitator drive module, 10-Feeding motor group, 11-Measuring motor group, 12-Agitating motor group, 13-Current transmitter system;
[0049] QF1-Power supply line isolating switch, QF11-Measurement motor load switch, QF12-Measurement motor load switch, QF21-Feed motor load switch, QF22-Feed motor load switch, QF31-Agitator motor load switch, QF32-Agitator motor load switch, GB31-Hall current transmitter;
[0050] Q1 - Main power switch, Q2 - Power circuit breaker 1, Q3 - Power circuit breaker 2, U1 - Rail-mounted Mean Well switching power supply 1, U2 - Rail-mounted Mean Well switching power supply 2, U3 - Rail-mounted Mean Well switching power supply 3, U4 - Rail-mounted Mean Well switching power supply 4, P1 - Power redundancy module 1, P2 - Power redundancy module 2.
[0051] A1 - Schenker module, KM11 - Motor measuring relay 1, U11 - Motor measuring thermistor relay, T11 - Motor measuring resistance temperature detector, KM12 - Motor measuring relay 2;
[0052] KM21-Feed motor relay 1, U21-Feed motor thermal relay, T21-Feed motor resistance temperature detector, KM22-Feed motor relay 2;
[0053] KM31-Agitator motor relay 1, U31-Agitator motor thermal relay, T31-Agitator motor thermal resistor, KM32-Agitator motor relay 2. Detailed Implementation
[0054] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.
[0055] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0056] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0057] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0058] Coal powder scales are one of the important pieces of equipment in cement production lines. With increasingly stringent requirements for production continuity, any malfunction or stoppage of any coal powder scale will severely impact production efficiency and cause significant losses.
[0059] In particular, the inverter and setpoint converter of the pulverized coal scale are more likely to be damaged. Since the integrated inverter uses a 24V power supply, if the AC380V to DC24V transformer inside the inverter's setpoint converter fails, the scale will inevitably trip. Because the on-site inverter does not have an independent motor current output, precise control and fault detection are impossible.
[0060] The field module uses AC220V power, which is converted to DC24V internally via a transformer. Finally, the 24V power is converted to power for the instruments. An internal large-capacity capacitor in the rectifier circuit causes the module to generate significant heat, resulting in uneven heat dissipation and preventing long-term operation. Furthermore, the field DISOCONT module cannot record historical faults. If a fault occurs, electrical maintenance personnel must arrive on-site within a very short time to inspect and troubleshoot, severely wasting repair time.
[0061] To address the aforementioned issues, this application provides a redundant hot standby system for a pulverized coal scale. Each motor of the pulverized coal scale employs an independent dual-circuit external power supply for redundant control. The feeding motor and measuring motor are each controlled by two frequency converters, one as the primary and one as a backup, providing hot standby power. The Schenker module and PLC system monitor and record the status of each motor and frequency converter in real time. When a frequency converter or Schenker module fails, the system switches between frequency converter operation and PLC control. When a certain mixer circuit fails, the system automatically switches to another hot standby starting circuit.
[0062] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.
[0063] Figure 1 This is a schematic diagram of the redundant thermal standby system for pulverized coal scales shown in the embodiments of this application.
[0064] See Figure 1 A redundant thermal backup system for pulverized coal scales, comprising:
[0065] The system includes: 1. Redundant power supply for the weighing instrument; 2. Redundant power supply for the frequency converter; 3. Schenker module; 4. PLC system; 5. Communication module; 6. Central control system; 7. Feeding frequency converter group; 8. Measuring frequency converter group; 9. Agitator drive module; 10. Feeding motor group; 11. Measuring motor group; 12. Agitator motor group; and 13. Current transmission system.
[0066] The redundant power supply 1 for the scale instrument is installed on the 220V AC power input line. The redundant power supply 1 for the scale instrument is connected to the Schenker module 3 and the PLC system 4. Specifically, the redundant power supply 1 for the scale instrument includes a main power switch Q1 installed on the 220V AC power input lines L and N, a rail-mounted Mean Well switch power supply U1 and a rail-mounted Mean Well switch power supply U2 connected in parallel to the 220V AC power input line behind the main power switch Q1, and a power circuit breaker Q2 installed on the front power line of the rail-mounted Mean Well switch power supply U1 and the rail-mounted Mean Well switch power supply U2.
[0067] The Mean Well DIN rail type switching power supplies U3 and U4 are connected in parallel to the 220V AC power input line located behind the main power switch Q1. Circuit breaker Q3 is installed on the front power lines of both U3 and U4. The rear ends of the Mean Well DIN rail type switching power supplies U1 and U2 are connected to power redundancy module P1, and the rear ends of U3 and U4 are connected to power redundancy module P2. Power redundancy modules P1 and P2 are respectively connected to Schenker module 3, PLC system 4, and the sensors on the coal powder scale for power supply supply. All Mean Well DIN rail type switching power supplies U1, U2, U3, and U4 are connected to ground.
[0068] The redundant power supply 2 of the frequency converter is installed on the 380V AC power input line. The redundant power supply 2 of the frequency converter is connected to the feeding frequency converter group 7, the measuring frequency converter group 8 and the agitator drive module 9. Specifically, the redundant power supply 2 of the frequency converter includes a power input line isolating switch QF1 installed on the 380V AC power lines L1, L2 and L3. The power lines behind the power input line isolating switch QF1 are connected in parallel and divided into six strands. The load switches QF11, QF12, QF21, QF22, QF31 and QF32 of the measuring motor 1 and the agitator motor 2 are respectively installed on the six power lines. The six power lines are respectively connected to the feeding frequency converter group 7, the measuring frequency converter group 8 and the agitator drive module 9. The Hall current transmitter GB31 is installed on the power lines in front of the load switches QF31 and QF32 of the agitator motor 1 and the agitator motor 2, and is used to detect the current of the agitator motor group 12.
[0069] The feeding inverter group 7, the measuring inverter group 8, and the agitator drive module 9 are respectively connected to control the feeding motor group 10, the measuring motor group 11, and the agitator motor group 12. Each of the feeding motor group 10, the measuring motor group 11, and the agitator motor group 12 is equipped with a current transmitter system 13. The current transmitter system 13 is connected to the Schenker module 3 and the PLC system 4. The real-time status of the motors is confirmed based on the current data fed back by the current transmitter system 13. Specifically, each feeding inverter group 7 includes two inverters, and the analog signal receiving ends of the two inverters are respectively... The drive module connected to Schenck module 3 has its pulse signal receiving end connected to PLC system 4, and its communication interface connected to the communication end of Schenck module 3. The U1, V1, and W1 terminals of the two frequency converters are connected to the QF21 and QF22 terminals of the redundant power supply 2 of the frequency converter, respectively. The U2, V2, and W2 terminals of feed frequency converter one are connected to the DC contactor of feed motor relay one KM21. The rear end of feed motor relay one KM21 is connected to the feed motor of feed motor group 10. The coil terminal of feed motor relay one KM21 is installed on feed frequency converter one. The front end of the DC contactor of feed motor relay KM22 is connected to the U2, V2, and W2 terminals of feed motor inverter 2, and the rear end is connected to the feed motor of the same feed motor group 10 as feed motor relay KM21. When feed motor inverter 1 fails, the feed motor current is fed back to Schenker module 3, disconnecting feed motor relay KM21 and energizing feed motor relay KM22, switching to feed motor inverter 2 for operation. When Schenker module 3 fails, the control of feed motor inverter group 7 is switched to PLC system 4.
[0070] The feed motor thermal relay U21 is connected to the Schenker module 3, the PLC system 4, and the feed frequency converter group 7. The feed motor thermal resistor T21 is connected to the feed motor thermal relay U21. The feed motor thermal resistor T21 is installed on the feed motor of the feed motor group 10. The operation of the feed motor is detected based on the detection data of the feed motor thermal resistor T21.
[0071] Each of the measurement inverter groups 8 includes two inverters. The analog signal receiving terminals of the two inverters are respectively connected to the drive module of the Schenker module 3, and the pulse signal receiving terminals are respectively connected to the PLC system 4. The communication interface is connected to the communication terminal of the Schenker module 3. The U1, V1, and W1 terminals of the two inverters are respectively connected to the QF11 and QF12 terminals of the inverter redundant power supply 2. The U2, V2, and W2 terminals of the first measurement inverter are connected to the DC contactor of the first measurement motor relay KM11. The rear end of the first measurement motor relay KM11 is connected to the measurement... The feed motor of motor group 11 has its measuring motor relay KM11 coil terminal mounted on measuring frequency converter one. The front end of the DC contactor of measuring motor relay two KM12 is connected to the U2, V2, and W2 terminals of measuring frequency converter two, and the rear end is connected to the measuring motor of the same measuring motor group 11, which is connected to measuring motor relay one KM11. When the feed frequency converter one fails, the measuring motor current is fed back to Schenker module 3, disconnecting measuring motor relay one KM11 and energizing measuring motor relay two KM12, switching to the operation of measuring frequency converter two. When Schenker module 3 fails, the control of measuring frequency converter group 8 is switched to PLC system 4.
[0072] The measuring motor thermal relay U11 is connected to the Schenker module 3, the PLC system 4, and the measuring frequency converter group 8. The measuring motor thermal relay U11 is connected to the measuring motor thermal resistor T11, which is installed on the measuring motor of the measuring motor group 11. The operating status of the feeding motor is detected based on the detection data of the measuring motor thermal resistor T11.
[0073] The agitator drive module 9 includes a first agitator motor relay KM31, a second agitator motor relay U31, a third agitator motor resistance temperature detector (RTD) T31, and a fourth agitator motor relay KM32. The contactor of the first agitator motor relay KM31 is installed on the power input lines QF31, L1, L2, and L3 of the motor in the agitator motor assembly 12, and the rear end of the contactor is connected to the agitator motor. The coil of the first agitator motor relay KM31 is connected to the motor drive terminal of the Schenker module 3. The agitator motor relay U31 is connected to the Schenker module 3, and the agitator motor resistance temperature detector (RTD) T31 is connected to the agitator motor relay U31. The RTD T31 is installed on the motor of the agitator motor assembly 12, and the operating status of the feed motor is detected based on the detection data of the RTD T31.
[0074] The KM32 contactor relay for the stirring motor is installed on the power input lines QF32.L1, L2, and L3 of the redundant power supply 2 of the frequency converter. The rear end of the contactor is connected to the stirring motor, and the coil is connected to the PLC system 4. When the Schenker module 3 fails, the control of the stirring motor group 12 is switched to the PLC system 4.
[0075] The feeding frequency converter group 7, the measuring frequency converter group 8, and the agitator drive module 9 are connected to the Schenker module 3 and the PLC system 4 for data exchange. The Schenker module 3 and the PLC system 4 are connected to the central control system 6 through the communication module 5 to record the coal powder scale's operating data, including historical fault data.
[0076] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.
Claims
1. A redundant thermal backup system for pulverized coal scales, characterized in that: The system includes: redundant power supply for weighing instrument (1), redundant power supply for frequency converter (2), Schenker module (3), PLC system (4), communication module (5), central control system (6), feeding frequency converter group (7), measuring frequency converter group (8), agitator drive module (9), feeding motor group (10), measuring motor group (11), agitator motor group (12), and current transmission system (13). The redundant power supply (1) of the scale instrument is installed on the 220V AC power input line. The redundant power supply (1) of the scale instrument is connected to the Schenker module (3) and the PLC system (4). The redundant power supply (2) of the frequency converter is installed on the 380V AC power input line. The redundant power supply (2) of the frequency converter is connected to the feeding frequency converter group (7), the measuring frequency converter group (8) and the agitator drive module (9). The feeding frequency converter group (7), the measuring frequency converter group (8) and the agitator drive module (9) are respectively connected to control the feeding motor group (10), the measuring motor group (11) and the agitator motor group (12). The feeding motor unit (10), measuring motor unit (11), and stirring motor unit (12) are all equipped with current transmission systems (13), which are connected to the Schenker module (3) and the PLC system (4). The feeding inverter group (7), the measuring inverter group (8) and the agitator drive module (9) are connected to the Schenker module (3) and the PLC system (4) via communication. The Schenker module (3) and the PLC system (4) are connected to the central control system (6) via the communication module (5).
2. The redundant thermal standby system for pulverized coal scales according to claim 1, characterized in that, The redundant power supply (1) for the weighing instrument includes: A main power switch Q1 is installed on the 220V AC power input line. The DIN rail type Mean Well switch power supply one U1 and the DIN rail type Mean Well switch power supply two U2 are connected in parallel to the 220V AC power input line behind the main power switch Q1. The power circuit breaker one Q2 is installed on the power line at the front end of the DIN rail type Mean Well switch power supply one U1 and the DIN rail type Mean Well switch power supply two U2. The DIN rail type Mean Well switching power supply 3U3 and DIN rail type Mean Well switching power supply 4U4 are connected in parallel and connected to the 220V AC power input line behind the main power switch Q1. The power circuit breaker 2Q3 is installed on the front power line of the DIN rail type Mean Well switching power supply 3U3 and DIN rail type Mean Well switching power supply 4U4. The rear ends of the DIN rail type Mean Well switching power supply 1 U1 and DIN rail type Mean Well switching power supply 2 U2 are connected to the power redundancy module 1 P1, the rear ends of the DIN rail type Mean Well switching power supply 3 U3 and DIN rail type Mean Well switching power supply 4 U4 are connected to the power redundancy module 2 P2, the power redundancy module 1 P1 and the power redundancy module 2 P2 are respectively connected to the Schenker module (3), the PLC system (4) and the sensor on the coal powder scale for power supply.
3. The redundant thermal standby system for pulverized coal scales according to claim 1, characterized in that, The inverter redundant power supply (2) includes: The power input isolating switch QF1 is installed on the 380V AC power line. The power lines at the rear of the power input isolating switch QF1 are connected in parallel and divided into six strands. The load switches QF11, QF12, QF21, QF22, QF31, and QF32 of the measuring motor are respectively installed on the six power lines. The six power lines are respectively connected to the feeding frequency converter group (7), the measuring frequency converter group (8), and the agitator drive module (9); The Hall current transmitter GB31 is installed on the power supply line at the front end of the first load switch QF31 and the second load switch QF32 of the stirring motor to detect the current of the stirring motor unit (12).
4. The redundant thermal standby system for pulverized coal scales according to claim 1, characterized in that: Each feeder frequency converter group (7) includes two frequency converters. The analog signal receiving ends of the two frequency converters are respectively connected to the drive module of the Schenker module (3), the pulse signal receiving ends are respectively connected to the PLC system (4), and the communication interface is connected to the communication end of the Schenker module (3). The U1, V1, and W1 terminals of the two frequency converters are respectively connected to the redundant power supply (2) of the frequency converter. The U2, V2, and W2 terminals of the feeding frequency converter are connected to the DC contactor of the feeding motor relay KM21. The rear end of the feeding motor relay KM21 is connected to the feeding motor of the feeding motor group (10). The coil terminal of the feeding motor relay KM21 is installed on the feeding frequency converter. The front end of the DC contactor of feed motor relay KM22 is connected to the U2, V2, and W2 terminals of feed frequency converter 2, and the rear end is connected to the feed motor of the same feed motor group (10) as feed motor relay KM21. The thermal relay U21 of the feed motor is connected to the Schenker module (3), the PLC system (4) and the feed frequency converter group (7) respectively. The thermal resistor T21 of the feed motor is connected to the thermal relay U21 of the feed motor. The thermal resistor T21 of the feed motor is installed on the feed motor of the feed motor group (10).
5. The redundant thermal standby system for pulverized coal scales according to claim 1, characterized in that: Each of the measurement inverter groups (8) includes two inverters. The analog signal receiving ends of the two inverters are respectively connected to the drive module of the Schenker module (3), the pulse signal receiving ends are respectively connected to the PLC system (4), and the communication interface is connected to the communication end of the Schenker module (3). The U1, V1, and W1 terminals of the two frequency converters are respectively connected to the redundant power supply (2) of the frequency converter. The U2, V2, and W2 terminals of the measuring frequency converter are connected to the DC contactor of the measuring motor relay KM11. The rear end of the measuring motor relay KM11 is connected to the feeding motor of the measuring motor group (11). The coil terminal of the measuring motor relay KM11 is installed on the measuring frequency converter. The front end of the DC contactor of the measuring motor relay KM12 is connected to the U2, V2, and W2 terminals of the measuring frequency converter 2, and the rear end is connected to the measuring motor of the same measuring motor group (11) of the measuring motor relay KM11. The measuring motor thermal relay U11 is connected to the Schenker module (3), the PLC system (4) and the measuring frequency converter group (8) respectively. The measuring motor thermal relay U11 is connected to the measuring motor thermal resistor T11, which is installed on the measuring motor of the measuring motor group (11).
6. The redundant thermal standby system for pulverized coal scales according to claim 1, characterized in that, The stirrer drive module (9) includes: Stirring motor relay 1 KM31, stirring motor thermal relay U31, stirring motor resistance temperature detector T31, and stirring motor relay 2 KM32; The contactor of the stirring motor relay KM31 is installed on the power input line of the stirring motor assembly (12), and the rear end of the contactor is connected to the stirring motor; the coil of the stirring motor relay KM31 is connected to the motor drive end of the Schenker module (3). The thermal relay U31 of the stirring motor is connected to the Schenker module (3). The thermal resistor T31 of the stirring motor is connected to the thermal relay U31. The thermal resistor T31 of the stirring motor is installed on the motor of the stirring motor assembly (12). The KM32 contactor of the stirring motor relay is installed on the motor power input line of another stirring motor group (12) of the frequency converter redundant power supply (2). The rear end of the contactor is connected to the stirring motor, and the coil is connected to the PLC system (4).
7. The redundant thermal standby system for pulverized coal scales according to claim 1, characterized in that: The central control system (6) is connected to the network communication terminal of the Schenker module (3) through the communication module (5).