Frequency conversion control system of coal conveyor
By introducing PLC components and relay components into the frequency converter control system of the coal conveyor and connecting them in series with the signal terminals of the frequency converter, the problem of inaccurate master-slave synchronous control was solved, and the protection of the motor and the remote detection and reset of slave faults were realized, thereby improving the stability and safety of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XINJIANG YIHUA MINING CO LTD
- Filing Date
- 2025-04-15
- Publication Date
- 2026-05-22
AI Technical Summary
In the existing technology, when three frequency converters drive three permanent magnet motors at the head of a belt conveyor, there is a problem of inaccurate synchronization between the main and slave motors during startup and shutdown, which may lead to motor damage or friction-induced fire. Furthermore, the slave motor fault detection is not timely and requires manual reset, affecting the stable operation of the equipment.
By employing PLC components and relay parts, and through the signal terminals of the series frequency converter, synchronous control between the master and slave units is ensured. A remote reset function is set up to achieve accurate judgment and control of the slave unit, avoiding motor damage. A signal switch is set on the PLC main line to prevent motor dragging, and slave unit fault detection and remote reset functions are added.
It achieves accurate synchronous control between master and slave devices, prevents motor damage and friction-induced fires, improves equipment stability and safety, and simplifies the remote detection and reset process for slave device faults.
Smart Images
Figure CN224267108U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of frequency conversion control equipment technology, and in particular to a frequency conversion control system for a coal conveyor. Background Technology
[0002] In modern open-pit coal mine production, the requirements for the intelligence and automation of electrical equipment are becoming increasingly stringent, and the economical and stable operation of equipment is also one of the goals pursued by many enterprises. The use of frequency converters appropriately meets the above requirements. However, in production applications, it is more complex than the direct starting of power frequency motors, and sometimes some faults or design defects may occur.
[0003] In existing technology, three frequency converters drive three permanent magnet motors at the head of a belt conveyor. According to design requirements, one is the master inverter, and the other two are slave inverters. The three inverters communicate via fiber optic cables. When the master inverter receives a start command, it sends a start command to the two slave inverters, and the two slave inverters start simultaneously following the master inverter. Similarly, the speed command received by the master inverter is also sent to the slave inverters to ensure they maintain the same operating speed. Figure 1 As shown, the master unit 81, slave units 82 and 83 are connected via interlocking wiring 9. When the master unit 81 receives a stop command, it also sends a stop command to the two slave units, causing them to stop simultaneously. Similarly, when the master unit 81 malfunctions or trips due to interlocking, it sends a fault signal to the slave units, causing them to trip as well. Furthermore, the three high-voltage switchgear circuit breakers are designed with an interlocking trip function. This means that if one high-voltage switchgear trips for any reason during operation, the other two circuit breakers will also trip simultaneously. This includes three scenarios: first, a frequency converter trips due to a major fault, causing the other two to trip in an interlocking manner; second, one switchgear protection trips, causing the other two to trip in an interlocking manner; and third, one switchgear circuit breaker is manually tripped, causing the other two to trip in an interlocking manner. Theoretically, as long as the frequency converter parameters are set correctly, there should be no problems during operation. However, in practical use, the following problems have occurred:
[0004] First, when the main unit 81 and one of the slave units are powered on, but the other slave unit is not powered on, when the belt is started, two motors will drive the other motor. If this is not detected for a long time, it will damage the motor or cause the roller to slip and rub, causing a fire.
[0005] Second, if a slave unit trips the inverter due to a minor fault during normal operation of the master and slave units, the other two inverters will not detect the fault in the slave unit and issue a stop command. This situation will also cause the first problem.
[0006] Third, when the inverter trips due to a minor fault, the automatic control computer can remotely reset the host 81. However, the designers did not consider the issue of slave reset, so manual reset must be performed on the inverter touch screen in the on-site power distribution room. Utility Model Content
[0007] In view of this, the present utility model provides a frequency conversion control system for a coal conveyor, the main purpose of which is to provide a frequency conversion control system for a coal conveyor that can make accurate judgments and execute commands based on the tripping of the host or slave machine.
[0008] To achieve the above objectives, this utility model mainly provides the following technical solutions:
[0009] This utility model embodiment provides a frequency conversion control system for a coal conveyor, the system comprising:
[0010] The frequency converter component includes a first frequency converter, a second frequency converter, and a third frequency converter. The first frequency converter includes a first frequency converter signal terminal, the second frequency converter includes a second frequency converter signal terminal, and the third frequency converter includes a third frequency converter signal terminal.
[0011] The PLC component includes a PLC main line and a PLC communication port. The PLC main line is connected to the PLC communication port. The PLC main line is equipped with a first frequency converter signal switch, a second frequency converter signal switch, and a third frequency converter signal switch. The first frequency converter signal terminal is connected to the first frequency converter signal switch, the second frequency converter signal terminal is connected to the second frequency converter signal switch, and the third frequency converter signal terminal is connected to the third frequency converter signal switch.
[0012] Furthermore, the relay component includes a relay body, a neutral wire, and a live wire. The relay body is connected to the neutral wire and the live wire respectively. The PLC component also includes a PLC controller, which is connected to the neutral wire.
[0013] Furthermore, the relay component also includes a main reset switch, and the PLC assembly also includes a PLC reset port, which is connected to the PLC controller. The main reset switch is located on the neutral line and is connected to the PLC controller.
[0014] Furthermore, the first frequency converter also includes a first frequency converter main unit ground terminal and a first frequency converter main unit input terminal, the second frequency converter also includes a second frequency converter slave unit ground terminal and a second frequency converter slave unit input terminal, and the third frequency converter also includes a third frequency converter slave unit ground terminal and a third frequency converter slave unit input terminal. The relay body is connected to the first frequency converter main unit ground terminal, the second frequency converter slave unit ground terminal, and the third frequency converter slave unit ground terminal.
[0015] Furthermore, the relay component also includes a first reset switch, a second reset switch, and a third reset switch. The first reset switch is connected to the ground terminal of the first inverter host and the input terminal of the first inverter host, respectively. The second reset switch is connected to the ground terminal of the second inverter slave and the input terminal of the second inverter slave, respectively. The third reset switch is connected to the ground terminal of the third inverter slave and the input terminal of the third inverter slave, respectively. The relay body is connected to the first reset switch, the second reset switch, and the third reset switch, respectively.
[0016] Furthermore, the first frequency converter also includes a first fault input port and a second fault input port. The second frequency converter also includes a second backup relay, and the third frequency converter also includes a third backup relay. The second backup relay is connected to the first fault input port, and the third backup relay is connected to the second fault input port.
[0017] Compared with the prior art, the present invention has the following technical effects:
[0018] In the technical solution provided by this utility model embodiment, the frequency converter component includes a first frequency converter, a second frequency converter, and a third frequency converter. The first frequency converter includes a first frequency converter signal terminal, the second frequency converter includes a second frequency converter signal terminal, and the third frequency converter includes a third frequency converter signal terminal. The PLC component includes a PLC main line and a PLC communication port. The PLC main line is connected to the PLC communication port. The PLC main line is equipped with a first frequency converter signal switch, a second frequency converter signal switch, and a third frequency converter signal switch. The first frequency converter signal terminal is connected to the first frequency converter signal switch, the second frequency converter signal terminal is connected to the second frequency converter signal switch, and the third frequency converter signal terminal is connected to the third frequency converter signal switch. The relay component includes a relay body, a neutral wire, and a live wire. Compared with the prior art, when the host 81 receives a stop command, it also sends a stop command to the two slave units, and the two slave units also stop simultaneously with the host 81. When the host 81 malfunctions or fails... When the circuit breaker trips, it also sends a fault signal to the slave unit, causing the slave unit to trip as well. Furthermore, the three high-voltage switchgear circuit breakers are designed with an interlocking tripping function. This means that if one high-voltage switchgear trips for any reason during operation, the other two high-voltage switchgear circuit breakers will also trip simultaneously. In this technical solution, by setting a first frequency converter signal switch, a second frequency converter signal switch, and a third frequency converter signal switch on the PLC main line, the first frequency converter signal terminal is connected to the first frequency converter signal switch, the second frequency converter signal terminal is connected to the second frequency converter signal switch, and the third frequency converter signal terminal is connected to the third frequency converter signal switch. This allows the permission signals emitted by the first, second, and third frequency converter signal terminals to be connected in series to the PLC main line. When any one frequency converter is not powered, it will not be connected, thus preventing two motors from driving another motor, thereby preventing damage to the motor or accidents caused by roller slippage and friction ignition, and ultimately achieving the technical effect of protecting the motor. Attached Figure Description
[0019] Figure 1 Here is the existing inverter wiring diagram;
[0020] Figure 2 This is a schematic diagram of the structure of a frequency conversion control system for a coal conveyor provided in an embodiment of the present utility model. Detailed Implementation
[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.
[0022] like Figure 2 As shown in the figure, this utility model embodiment provides a frequency conversion control system for a coal conveyor, the system comprising:
[0023] The frequency converter component includes a first frequency converter, a second frequency converter, and a third frequency converter. The first frequency converter includes a first frequency converter signal terminal 111, the second frequency converter includes a second frequency converter signal terminal 121, and the third frequency converter includes a third frequency converter signal terminal 131.
[0024] The PLC component includes a PLC main line 21 and a PLC communication port 22. The PLC communication port 22 is connected to the PLC main line 21. The PLC main line 21 is equipped with a first frequency converter signal switch, a second frequency converter signal switch, and a third frequency converter signal switch. The first frequency converter signal terminal 111 is connected to the first frequency converter signal switch, the second frequency converter signal terminal 121 is connected to the second frequency converter signal switch, and the third frequency converter signal terminal 131 is connected to the third frequency converter signal switch.
[0025] In the technical solution provided by this utility model embodiment, the frequency converter component includes a first frequency converter, a second frequency converter, and a third frequency converter. The first frequency converter includes a first frequency converter signal terminal 111, the second frequency converter includes a second frequency converter signal terminal 121, and the third frequency converter includes a third frequency converter signal terminal 131. The PLC component includes a PLC main line 21 and a PLC communication port 22. The PLC main line 21 is connected to the PLC communication port 22, and a first frequency converter signal terminal is provided on the PLC main line 21. The system includes a first inverter signal switch, a second inverter signal switch, and a third inverter signal switch. The first inverter signal terminal 111 is connected to the first inverter signal switch, the second inverter signal terminal 121 is connected to the second inverter signal switch, and the third inverter signal terminal 131 is connected to the third inverter signal switch. Compared to existing technology, when the host 81 receives a stop command, it also sends a stop command to both slave units, causing both slave units to stop simultaneously with the host 81. Similarly, when the host 81 malfunctions or experiences a cascading trip, it will also send a fault signal. A fault signal is sent to the slave unit, causing it to trip. Furthermore, the three high-voltage switchgear circuit breakers are designed with an interlocking tripping function. This means that if one high-voltage switchgear trips for any reason during operation, the other two circuit breakers will also trip simultaneously. In this technical solution, a first frequency converter signal switch, a second frequency converter signal switch, and a third frequency converter signal switch are installed on the PLC main line 21. The first frequency converter signal terminal 111 is connected to the first frequency converter signal switch, the second frequency converter signal terminal 121 is connected to the second frequency converter signal switch, and the third frequency converter signal terminal 131 is connected to the third frequency converter signal switch. This allows the permission signals from the first frequency converter signal terminal 111, the second frequency converter signal terminal 121, and the third frequency converter signal terminal 131 to be connected in series to the PLC main line 21. When any one of the frequency converters is not powered, it will not be connected, thus preventing two motors from driving another motor, thereby preventing damage to the motor or accidents caused by roller slippage and friction ignition, and ultimately achieving the technical effect of protecting the motor.
[0026] The aforementioned frequency converter components include a first frequency converter, a second frequency converter, and a third frequency converter. The first frequency converter is the master unit, and the second and third frequency converters are slave units. The first frequency converter includes a first frequency converter signal terminal 111, the second frequency converter includes a second frequency converter signal terminal 121, and the third frequency converter includes a third frequency converter signal terminal 131. After the master unit starts, it communicates in real time with the second and third frequency converters via optical fiber. The master unit outputs through the first frequency converter signal terminal, while the slave units output through the second and third frequency converter signal terminals 121 and 131, respectively. The first inverter signal terminal 111 receives data information, and the host determines whether the slave unit is operating normally, whether the current, frequency, and output torque fed back by the host are within the normal error range, and whether all slave units are operating normally. The PLC component includes a PLC main line 21 and a PLC communication port 22. The PLC main line 21 is connected to the PLC communication port 22. The PLC main line 21 is equipped with a first inverter signal switch 23, a second inverter signal switch 24, and a third inverter signal switch 25. The first inverter signal terminal 111... The signal switch 23 of the first frequency converter is connected, the signal terminal 121 of the second frequency converter is connected to the signal switch 24 of the second frequency converter, and the signal terminal 131 of the third frequency converter is connected to the signal switch 25 of the third frequency converter; the relay component includes a relay body 31, a neutral wire 32, and a live wire 33, the relay body 31 being connected to the neutral wire 32 and the live wire 33 respectively; the PLC component also includes a PLC controller 26, the PLC controller 26 being connected to the neutral wire 32; the first frequency converter... Signal switch 23, second inverter signal switch 24, and third inverter signal switch 25 will only close when the first inverter signal terminal 111, the second inverter signal terminal 121, and the third inverter signal terminal 131 are all outputting normally, and the PLC communication port 22 will only be connected. When any one of the signal terminals is not powered, the PLC communication port 22 will not be connected, thereby preventing two motors from driving the other motor, thus preventing damage to the motor or causing the roller to slip and rub, thus achieving the technical effect of protecting the motor.
[0027] Furthermore, the relay component also includes a main reset switch 34, and the PLC component also includes a PLC reset port 35, which is connected to the PLC controller 26. The main reset switch 34 is located on the neutral line 32 and connected to the PLC controller 26. In this embodiment, the relay component is further defined. When the inverter trips due to a minor fault, the automatic control computer can remotely reset the first inverter. However, the designers did not consider the issue of slave reset, requiring manual reset on the inverter touchscreen in the on-site power distribution room. Therefore, the PLC reset signal is extended to three reset signals by extending the relay points. Specifically, the first inverter also includes a first inverter host ground terminal 112 and a first inverter host input terminal 113, and the second inverter also includes a second inverter slave ground terminal 122 and a second inverter slave input terminal 122. The third frequency converter also includes a third frequency converter slave ground terminal 132 and a third frequency converter slave input terminal 133. The relay body 31 is connected to the first frequency converter master ground terminal 112, the second frequency converter slave ground terminal 122, and the third frequency converter slave ground terminal 132. The relay component also includes a first reset switch 36, a second reset switch 37, and a third reset switch 38. The first reset switch 36 is connected to the first frequency converter master ground terminal 112 and the first frequency converter master input terminal 113, respectively. Reset switch 37 is connected to the slave ground terminal 122 and the slave input terminal 123 of the second frequency converter, respectively. Reset switch 38 is connected to the slave ground terminal 132 and the slave input terminal 133 of the third frequency converter, respectively. Relay body 31 is connected to the first reset switch 36, the second reset switch 37, and the third reset switch 38, respectively. A command is remotely transmitted to the PLC controller 26 via the PLC reset port 35. The PLC controller 26 controls the main reset switch 34 to close, activating the relay body 31 and simultaneously controlling... When the first reset switch 36, the second reset switch 37, and the third reset switch 38 are closed, the first, second, and third frequency converters are reset, thus achieving the technical effect of convenient frequency converter reset. It should be noted that not all frequency converter faults can be reset remotely without inspection. For frequency converter shutdown faults caused by belt interlocking, the operator can remotely reset the frequency converter through the central control computer and then start the machine after eliminating the cause of the belt interlocking. However, for frequency converter faults caused by other reasons that cannot be reset, electrical professionals must be contacted to check and troubleshoot the fault before starting the machine.
[0028] Furthermore, the first frequency converter also includes a first fault input port and a second fault input port. The second frequency converter also includes a second backup relay, and the third frequency converter also includes a third backup relay. The second backup relay is connected to the first fault input port, and the third backup relay is connected to the second fault input port. In this embodiment, the frequency converter components are further defined. When the frequency converter master and slave are operating normally, if one slave unit experiences a minor fault and trips the frequency converter, the other two frequency converters will not detect that a slave unit has failed and will not issue a stop command. When this happens, the first problem will also occur. The specific reason is that when the frequency converter is operating in master-slave mode, only one slave unit is operating normally. The master will compare and calculate the parameters with the normal slave units. The master will determine that all slave units are operating normally, and therefore cannot determine that one slave unit has stopped. Therefore, a first fault input port and a second fault input port are set on the first frequency converter. The second frequency converter also includes a second backup relay, and the third frequency converter also includes... The third backup relay is connected to the second fault input port, and the second backup relay is connected to the second fault input port. When the second or third frequency converter fails, the second or third backup relay will output a dry contact. The dry contact is connected to the first or second fault input port through a control cable. When the host detects the stop signal returned from the first or second fault input port, the host will stop and simultaneously send a stop signal to the second or third frequency converter to stop it. This allows the host to detect the operating status of different slave devices separately, thereby achieving the technical effect of conveniently monitoring the status of slave devices.
[0029] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.
Claims
1. A frequency conversion control system for a coal conveyor, characterized in that, include: The frequency converter component includes a first frequency converter, a second frequency converter, and a third frequency converter. The first frequency converter includes a first frequency converter signal terminal, the second frequency converter includes a second frequency converter signal terminal, and the third frequency converter includes a third frequency converter signal terminal. The PLC component includes a PLC main line and a PLC communication port. The PLC main line is connected to the PLC communication port. The PLC main line is equipped with a first frequency converter signal switch, a second frequency converter signal switch, and a third frequency converter signal switch. The first frequency converter signal terminal is connected to the first frequency converter signal switch, the second frequency converter signal terminal is connected to the second frequency converter signal switch, and the third frequency converter signal terminal is connected to the third frequency converter signal switch.
2. The frequency conversion control system for a coal conveyor according to claim 1, characterized in that, Also includes: The relay component includes a relay body, a neutral wire, and a live wire. The relay body is connected to the neutral wire and the live wire respectively. The PLC component also includes a PLC controller, which is connected to the neutral wire.
3. The frequency conversion control system for a coal conveyor according to claim 2, characterized in that, The relay component also includes a main reset switch, and the PLC component also includes a PLC reset port, which is connected to the PLC controller. The main reset switch is located on the neutral line and is connected to the PLC controller.
4. The frequency conversion control system for a coal conveyor according to claim 3, characterized in that, The first frequency converter further includes a first frequency converter main unit ground terminal and a first frequency converter main unit input terminal; the second frequency converter further includes a second frequency converter slave unit ground terminal and a second frequency converter slave unit input terminal; the third frequency converter further includes a third frequency converter slave unit ground terminal and a third frequency converter slave unit input terminal; and the relay body is connected to the first frequency converter main unit ground terminal, the second frequency converter slave unit ground terminal, and the third frequency converter slave unit ground terminal.
5. The frequency conversion control system for a coal conveyor according to claim 4, characterized in that, The relay component further includes a first reset switch, a second reset switch, and a third reset switch. The first reset switch is connected to the ground terminal of the first inverter host and the input terminal of the first inverter host, respectively. The second reset switch is connected to the ground terminal of the second inverter slave and the input terminal of the second inverter slave, respectively. The third reset switch is connected to the ground terminal of the third inverter slave and the input terminal of the third inverter slave, respectively. The relay body is connected to the first reset switch, the second reset switch, and the third reset switch, respectively.
6. A frequency conversion control system for a coal conveyor according to any one of claims 1 to 5, characterized in that, The first frequency converter further includes a first fault input port and a second fault input port. The second frequency converter also includes a second backup relay. The third frequency converter further includes a third backup relay. The second backup relay is connected to the first fault input port, and the third backup relay is connected to the second fault input port.