Frequency conversion cabinet output control method and device suitable for mine ore washing line

Abstract

The invention provides a frequency conversion cabinet output control method and device suitable for a mine ore washing line. The method comprises the steps that a frequency conversion cabinet is started, and system self-inspection is carried out; after the self-inspection is completed, receiving a working mode instruction of the frequency converter sent by a touch screen on the frequency conversion cabinet; the frequency conversion cabinet comprises a plurality of frequency converters which are electrically connected with the motor; according to the real-time working condition of the ore washing line, current and rotating speed data of a motor are collected through a current sensor and a rotating speed sensor; and adjusting the output frequency of the frequency converter according to the current and rotating speed data and the working mode instruction so as to accurately control the rotating speed and the current of the motor. The control module is adopted, the touch screen, the sensor and the PID algorithm are combined, and accurate control over the multiple motors in the mine ore washing line is achieved. According to the control method, the rotating speed and the current of the motors can be dynamically adjusted according to the real-time working condition, it is ensured that the rotating speeds of the multiple motors are kept consistent and the current is balanced in the cooperative working mode, and therefore the overall operation efficiency and quality of the ore washing line are effectively improved.

Description

Technical Field

[0001] This application belongs to the field of mineral washing technology, specifically, it relates to a variable frequency cabinet output control method and device suitable for mineral washing lines. Background Technology

[0002] A mine washing line is a complex industrial production system used to remove impurities from ore, typically involving the coordinated operation of multiple motors. These motors primarily function in feeding, crushing, screening, and washing processes. Each stage requires a motor with specific speed and current to ensure smooth and efficient operation.

[0003] Traditional frequency converter control systems can only control a few motors individually, failing to flexibly coordinate the operation of multiple motors. This leads to several problems: First, the motor speed and current cannot be precisely adjusted, especially when multiple motors need to work simultaneously, making it difficult to ensure consistent speed and current among them. For example, if the feed motor's speed is unstable, it will be unable to provide a constant feed rate, thus affecting the operation of subsequent crushing, screening, and other processes, resulting in low ore washing efficiency and even impacting the quality of ore washing and beneficiation.

[0004] Secondly, different motors have different load characteristics. Some motors may carry excessive loads, leading to current imbalance. This not only affects the stable operation of the motor but may also increase equipment wear and shorten its service life. Traditional control methods cannot precisely regulate motor current, which may result in motor overload or operation under light load, increasing energy consumption and maintenance costs.

[0005] Traditional control systems often only allow for simple, independent control of each motor, failing to achieve synchronous control when multiple motors work together. Therefore, when multiple motors collaborate in the same process, incoordination may occur, leading to inconsistent speeds and impacting the overall efficiency of the ore washing line. Summary of the Invention

[0006] This application provides a variable frequency cabinet output control method and device suitable for mine washing lines, so as to at least solve the problems of inconsistent speed and unbalanced current in the existing multi-motor cooperative control.

[0007] According to one aspect of this application, a variable frequency drive (VFD) cabinet output control method suitable for mine washing lines is provided, comprising:

[0008] Start the frequency converter cabinet and perform a system self-check;

[0009] After completing the self-check, it receives the inverter's operating mode command sent by the touch screen on the inverter cabinet; the inverter cabinet includes multiple inverters, and the inverters are electrically connected to the motors;

[0010] Based on the real-time operating conditions of the ore washing line, the current and speed data of the motor are collected through current sensors and speed sensors;

[0011] Based on current and speed data and operating mode commands, the inverter's output frequency is adjusted to achieve precise control of motor speed and current.

[0012] In one embodiment, adjusting the output frequency of the frequency converter based on current and speed data and operating mode commands includes:

[0013] Calculate the motor speed deviation based on current and speed data;

[0014] The inverter's output frequency is dynamically adjusted based on the speed deviation and the operating mode in the operating mode command; the operating modes include: cooperative operating mode and independent operating mode.

[0015] In one embodiment, calculating the motor speed deviation based on current and speed data includes:

[0016] Based on current and speed data, the deviation between the motor speed and the preset target speed is calculated.

[0017] In one embodiment, when the operating mode is the cooperative operating mode, the output frequency of the frequency converter is dynamically adjusted based on the speed deviation and the operating mode in the operating mode command, including:

[0018] Based on the speed deviation, the output frequency of the frequency converter is dynamically adjusted using a PID control algorithm to reduce the gap between the motor speed and the target speed. The process of dynamically adjusting the output frequency of the frequency converter is as follows: based on the load and operating condition data of multiple motors, the output frequency of each frequency converter is adjusted to ensure that the speed and current of multiple motors are coordinated.

[0019] In one embodiment, when the operating mode is a standalone operating mode, the output frequency of the frequency converter is dynamically adjusted based on the speed deviation and the operating mode in the operating mode command, including:

[0020] Based on the speed deviation, the output frequency of the frequency converter is dynamically adjusted using a PID control algorithm to reduce the gap between the motor speed and the target speed. The process of dynamically adjusting the output frequency of the frequency converter is as follows: adjust the output frequency of the corresponding frequency converter according to the current and speed data of the motor to ensure that the speed and current of the motor meet the preset requirements.

[0021] In one embodiment, the frequency converter cabinet output control method further includes:

[0022] The motor's current and speed data are periodically fed back to the touchscreen for users to monitor in real time.

[0023] According to another aspect of this application, a frequency converter output control device suitable for a mine washing line is also provided, comprising:

[0024] The self-checking unit is used to start the frequency converter cabinet and perform a system self-check.

[0025] The operating mode selection unit is used to receive the operating mode command of the frequency converter sent by the touch screen on the frequency converter cabinet after completing the self-check; the frequency converter cabinet includes multiple frequency converters, and the frequency converters are electrically connected to the motors;

[0026] The data acquisition unit is used to collect the current and speed data of the motor through current sensors and speed sensors based on the real-time operating conditions of the ore washing line.

[0027] The motor control unit is used to adjust the output frequency of the frequency converter based on current and speed data and operating mode commands, so as to achieve precise control of motor speed and current.

[0028] In one embodiment, the motor control unit includes:

[0029] The speed deviation calculation module is used to calculate the motor speed deviation based on current and speed data;

[0030] The dynamic frequency adjustment module is used to dynamically adjust the output frequency of the frequency converter based on the speed deviation and the working mode in the working mode command; the working modes include: cooperative working mode and independent working mode.

[0031] This application utilizes a control module, combined with a touchscreen, sensors, and PID algorithms, to achieve precise control of multiple motors in a mine washing line. This control method dynamically adjusts the motor speed and current based on real-time operating conditions, ensuring consistent speed and current balance among multiple motors in a collaborative working mode. This effectively improves the overall operating efficiency and quality of the washing line. Precise control avoids equipment damage and washing quality issues caused by uneven motor load or unstable speed, significantly reducing equipment wear and maintenance costs. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This application provides a flowchart of a frequency converter cabinet output control method applicable to a mine washing line.

[0034] Figure 2This is a flowchart illustrating a method for adjusting the output frequency of a frequency converter based on current and speed data and operating mode commands, as described in this application.

[0035] Figure 3 A frequency converter cabinet provided for this application.

[0036] Figure 4 The touchscreen is the control module's touchscreen in this embodiment.

[0037] Figure 5 This is a schematic diagram of a user setting a target rotation speed on a touchscreen in an embodiment of this application.

[0038] Figure 6 This is a specific implementation of an electronic device in the embodiments of this application. Detailed Implementation

[0039] 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.

[0040] A mine washing line is a complex industrial production system used to remove impurities from ore, typically involving the coordinated operation of multiple motors. These motors primarily function in feeding, crushing, screening, and washing processes. Each stage requires a motor with specific speed and current to ensure smooth and efficient operation.

[0041] Traditional frequency converter control systems can only control a few motors individually, failing to flexibly coordinate the operation of multiple motors. This leads to several problems: First, the motor speed and current cannot be precisely adjusted, especially when multiple motors need to work simultaneously, making it difficult to ensure consistent speed and current among them. For example, if the feed motor's speed is unstable, it will be unable to provide a constant feed rate, thus affecting the operation of subsequent crushing, screening, and other processes, resulting in low ore washing efficiency and even impacting the quality of ore washing and beneficiation.

[0042] Secondly, different motors have different load characteristics. Some motors may carry excessive loads, leading to current imbalance. This not only affects the stable operation of the motor but may also increase equipment wear and shorten its service life. Traditional control methods cannot precisely regulate motor current, which may result in motor overload or operation under light load, increasing energy consumption and maintenance costs.

[0043] Traditional control systems often only allow for simple, independent control of each motor, failing to achieve synchronous control when multiple motors work together. Therefore, when multiple motors collaborate in the same process, incoordination may occur, leading to inconsistent speeds and impacting the overall efficiency of the ore washing line.

[0044] Therefore, this application solves the problem of traditional frequency converters' inability to flexibly coordinate multiple motors by introducing an intelligent collaborative control method based on control modules. This method enables precise adjustment of speed and current when multiple motors in a mining washing line work collaboratively, ensuring synchronization of operating states between motors in each stage. By dynamically adjusting the motor speed and current, this application allows the feeding motor to maintain a stable feed rate, thereby ensuring the smooth operation of subsequent crushing, screening, and other stages, improving washing efficiency and ore washing quality.

[0045] Furthermore, this application avoids motor overload or prolonged light-load operation by real-time monitoring of motor current and speed, combined with PID algorithm to adjust the inverter's output frequency, significantly reducing motor energy consumption and equipment wear. The system's redundant design also enhances fault tolerance, enabling multiple motors to work stably and collaboratively even under complex operating conditions, greatly improving the overall operating efficiency and equipment reliability of the mine washing line.

[0046] According to one aspect of this application, a variable frequency drive (VFD) cabinet output control method suitable for mine washing lines is provided, such as... Figure 1 As shown, it includes:

[0047] S101: Start the frequency converter cabinet and perform a system self-check.

[0048] During startup, the frequency converter cabinet performs a self-test using its built-in self-test program to check each hardware component, such as the current sensor, speed sensor, and frequency converter, to ensure they are functioning correctly. This system self-test ensures that all hardware components are fault-free and ready to enter control operation mode.

[0049] S102: After completing the self-check, receive the inverter's operating mode command sent by the touch screen on the inverter cabinet; the inverter cabinet includes multiple inverters, and the inverters are electrically connected to the motors.

[0050] After completing the self-test, the frequency converter cabinet receives instructions input via the touchscreen, which determine the inverter's operating mode. Operating modes include: standalone operating mode and collaborative operating mode. The touchscreen serves as the human-machine interface, allowing users to configure individual motors to operate independently or multiple motors to operate collaboratively, according to their needs.

[0051] S103: Based on the real-time operating conditions of the ore washing line, the current and speed data of the motor are collected through current sensors and speed sensors.

[0052] Based on the real-time operating conditions of the ore washing line, current and speed data of the motor are collected using current and speed sensors. This data provides the necessary basis for subsequent dynamic adjustments, ensuring that the frequency converter can accurately control the motor according to actual operating conditions.

[0053] S104: Adjust the output frequency of the inverter according to the current and speed data and the working mode command to achieve precise control of the motor speed and current.

[0054] Based on the collected current and speed data, as well as the operating mode commands sent via the touchscreen, the control module adjusts the inverter's output frequency to achieve precise control of the motor's speed and current. This step ensures that the motor operates efficiently according to the set targets.

[0055] In one embodiment, the output frequency of the frequency converter is adjusted based on current and speed data and operating mode commands, such as... Figure 2 As shown, it includes:

[0056] S201: Calculate the motor speed deviation based on current and speed data.

[0057] Based on real-time current and speed data, the deviation between the motor speed and the preset target speed is calculated. This step is to determine whether there is a difference between the motor speed and the target speed, providing a basis for subsequent adjustments.

[0058] S202: Based on the speed deviation and the working mode in the working mode command, dynamically adjust the output frequency of the frequency converter; the working modes include: cooperative working mode and independent working mode.

[0059] After calculating the discrepancy based on the speed deviation, the inverter's output frequency is dynamically adjusted according to the current operating mode (cooperative or standalone). By adjusting the frequency, the motor speed is ensured to match the target speed, avoiding excessive deviation from affecting the washing efficiency and quality.

[0060] In one embodiment, calculating the motor speed deviation based on current and speed data includes:

[0061] Based on current and speed data, the deviation between the motor speed and the preset target speed is calculated.

[0062] In one embodiment, when the operating mode is the cooperative operating mode, the output frequency of the frequency converter is dynamically adjusted based on the speed deviation and the operating mode in the operating mode command, including:

[0063] Based on the speed deviation, the output frequency of the frequency converter is dynamically adjusted using a PID control algorithm to reduce the gap between the motor speed and the target speed. The process of dynamically adjusting the output frequency of the frequency converter is as follows: based on the load and operating condition data of multiple motors, the output frequency of each frequency converter is adjusted to ensure that the speed and current of multiple motors are coordinated.

[0064] When operating in collaborative mode, multiple motors need to work together to complete a task, thus requiring coordination of their speeds and currents. In this mode, the speed deviation of each motor is first calculated, and a PID control algorithm dynamically adjusts the inverter's output frequency based on this deviation. This process adjusts the output frequency of each inverter based on the load and operating condition data of multiple motors, ensuring that the speed and current of the multiple motors remain consistent during collaborative operation. The PID control algorithm continuously adjusts the inverter's output frequency based on real-time data, optimizing the motor speeds to more accurately reach the set target values, thereby achieving collaborative operation among multiple motors. By coordinating the speeds and currents of the motors, this embodiment effectively avoids incoordination between motors, thereby improving the overall efficiency of the ore washing line.

[0065] In one embodiment, when the operating mode is a standalone operating mode, the output frequency of the frequency converter is dynamically adjusted based on the speed deviation and the operating mode in the operating mode command, including:

[0066] Based on the speed deviation, the output frequency of the frequency converter is dynamically adjusted using a PID control algorithm to reduce the gap between the motor speed and the target speed. The process of dynamically adjusting the output frequency of the frequency converter is as follows: adjust the output frequency of the corresponding frequency converter according to the current and speed data of the motor to ensure that the speed and current of the motor meet the preset requirements.

[0067] When operating in standalone mode, only a single motor runs, resulting in relatively low control complexity. In standalone mode, the frequency converter controls only the speed and current of one motor. Similar to cooperative mode, the motor's speed deviation is first calculated, and a PID control algorithm dynamically adjusts the frequency converter's output frequency based on this deviation. This ensures the motor speed is as close as possible to the target speed, avoiding the negative impacts of speed instability. By monitoring the motor's current and speed in real time and adjusting the corresponding frequency converter output frequency, the motor operates within the normal range, meeting preset current and speed requirements, thereby improving equipment reliability and lifespan.

[0068] In one embodiment, the frequency converter cabinet output control method further includes:

[0069] The motor's current and speed data are periodically fed back to the touchscreen for users to monitor in real time.

[0070] During inverter operation, the main control board continuously acquires motor current and speed data through a real-time data acquisition system. This data is periodically sent to the touchscreen, allowing users to monitor the motor's operating status in real time and ensure that the motor operates as expected.

[0071] In one specific embodiment, before starting the mine washing line, the frequency converter system is initialized, and the control module performs a self-check to ensure the hardware equipment is working properly. Simultaneously, according to the washing process requirements, initial operating parameters for various motors are preset in the control module, including target speed range, current upper and lower limits, and initial PID control parameters. Figure 3 Taking the inverter cabinet shown as an example, it contains 16 inverters. Since in actual operation, not all inverters need to operate simultaneously, it is necessary to first control them via the touchscreen of the control module (e.g., ...). Figure 4 (As shown) Select the device to be enabled. The selected frequency converter has two operating modes:

[0072] Individual operating mode: Each frequency converter independently controls one motor and performs its own corresponding task;

[0073] Collaborative working mode: This mode can be selected when the power of a single frequency converter is less than the power required to operate the conveyor belt of the ore washing line. Each frequency converter still controls one motor, but multiple motors need to cooperate to complete the same task.

[0074] In one specific embodiment, after the inverter settings are completed, the touch screen will send the inverter information to be controlled to the main control board via the serial port. The main control board will control the relay to power on the selected inverter, and the inverters not selected will not work. Figure 4 In the setup, inverters 2, 3, 4, and 5 are set to work independently, while inverters 1, 3, 11, and 16 are set to work collaboratively. After pressing the setup completion button, these inverters will be powered on.

[0075] In one specific embodiment, on the touchscreen interface, the required speed and maximum allowable current value are set for each individually operating frequency converter, such as... Figure 3 As shown; the common operating speed value and the maximum allowable current value for each inverter group are set for the cooperative working inverter group. After the settings are completed, they are also sent to the main control board via serial port. The main control board calculates the frequency according to the formula.

[0076]

[0077] In the formula, f represents the frequency value sent by the main control board to the inverter, and n represents the frequency value sent by the user. Figure 5The target speed is set, where p represents the number of pole pairs of the motor. The main control board encapsulates the calculated frequency value into a data frame according to the corresponding address via the Modbus_RTU protocol and sends it to each inverter in sequence. After receiving the command, the inverter starts running, and at the same time, the speed sensor and current sensor continuously feed back the real-time monitored motor operating data (such as actual speed and current value) to the main control board, forming a closed-loop control.

[0078] In one specific embodiment, for a motor operating independently, after the motor speed stabilizes, the main control board uses a PID control algorithm based on the feedback speed and voltage values ​​to process the deviation between the target speed and the actual speed, and dynamically corrects the output frequency. The calculation method is as follows:

[0079]

[0080] in:

[0081] e(t) = n 目标 -n 实际 Indicates the deviation between the target value and the actual value of the rotational speed; K P K i With K d These are the proportional, integral, and derivative coefficients commonly used in PID algorithms.

[0082] The actual frequency output to the inverter is:

[0083] f 输出 =f 目标 +△f#(3)

[0084] For motors working in tandem, the calculation method is similar to that for motors working independently, but the selected proportional, integral, and derivative coefficients are slightly different. Simultaneously, the main control board MCU will periodically send the collected current and speed data, as well as the voltage and frequency values ​​output by the control inverter, to the touchscreen. If the main control board does not receive a response from the inverter, it will retransmit the data frame. After exceeding the specified number of retransmissions, the inverter is considered damaged, and the main control board will disconnect the inverter's power supply.

[0085] This application discloses a variable frequency drive (VFD) cabinet output control method. The control module, comprised of a main controller, a touchscreen, a current sensor, and a motor speed sensor, implements the specific control process. This method allows for precise control of the speed and current of multiple motors based on the real-time operating conditions of the ore washing line, improving the stability and reliability of motor operation and preventing issues such as reduced ore washing quality and equipment damage caused by unstable motor speed or abnormal current. A key feature of this invention is that the control module provides dual management of each VFD within the cabinet. It can independently control the start / stop status of each VFD and flexibly set its operating mode (individual operating mode and collaborative operating mode). For VFDs in operation, the control module collects real-time speed and current data of the corresponding motors using sensors. Based on this data, it dynamically adjusts the output frequency of the VFDs, ensuring coordinated matching of speed and current across multiple motors, ultimately providing a safe, stable, efficient, and energy-saving operating environment for the ore washing production line.

[0086] Based on the same inventive concept, this application also provides a variable frequency drive (VFD) cabinet output control device suitable for mine washing lines, which can be used to implement the methods described in the above embodiments, as described in the following embodiments. Since the principle of this VFD cabinet output control device for mine washing lines is similar to that of the VFD cabinet output control method for mine washing lines, the implementation of the VFD cabinet output control device for mine washing lines can refer to the implementation of the VFD cabinet output control method for mine washing lines, and repeated details will not be elaborated further. As used below, the terms "unit" or "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the system described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0087] According to another aspect of this application, a frequency converter output control device suitable for a mine washing line is provided, comprising:

[0088] The self-checking unit is used to start the frequency converter cabinet and perform a system self-check.

[0089] The operating mode selection unit is used to receive the operating mode command of the frequency converter sent by the touch screen on the frequency converter cabinet after completing the self-check; the frequency converter cabinet includes multiple frequency converters, and the frequency converters are electrically connected to the motors;

[0090] The data acquisition unit is used to collect the current and speed data of the motor through current sensors and speed sensors based on the real-time operating conditions of the ore washing line.

[0091] The motor control unit is used to adjust the output frequency of the frequency converter based on current and speed data and operating mode commands, so as to achieve precise control of motor speed and current.

[0092] In one embodiment, the motor control unit includes:

[0093] The speed deviation calculation module is used to calculate the motor speed deviation based on current and speed data;

[0094] The dynamic frequency adjustment module is used to dynamically adjust the output frequency of the frequency converter based on the speed deviation and the working mode in the working mode command; the working modes include: cooperative working mode and independent working mode.

[0095] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0096] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0097] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0098] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1The steps of the function specified in one or more boxes.

[0099] Specific embodiments have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

[0100] This application also provides a specific implementation of an electronic device capable of implementing all the steps in the methods described above. See [link to implementation details]. Figure 6 The electronic device specifically includes the following:

[0101] Figure 6 This is a schematic diagram of the physical structure of an electronic device provided in an embodiment of this application. The electronic device includes: a processor 601, a memory 602, and a bus 603.

[0102] The processor 601 and the memory 602 communicate with each other via the bus 603.

[0103] The processor 601 is used to call the computer program in the memory 602. When the processor executes the computer program, it implements all the steps in the method in the above embodiments. For example, when the processor executes the computer program, it implements the following steps:

[0104] S101: Start the frequency converter cabinet and perform a system self-check.

[0105] S102: After completing the self-check, receive the inverter's operating mode command sent by the touch screen on the inverter cabinet; the inverter cabinet includes multiple inverters, and the inverters are electrically connected to the motors.

[0106] S103: Based on the real-time operating conditions of the ore washing line, the current and speed data of the motor are collected through current sensors and speed sensors.

[0107] S104: Adjust the output frequency of the inverter according to the current and speed data and the working mode command to achieve precise control of the motor speed and current.

[0108] Embodiments of this application also provide a computer-readable storage medium capable of implementing all steps of the methods in the above embodiments. The computer-readable storage medium stores a computer program that, when executed by a processor, implements all steps of the methods in the above embodiments. For example, when the processor executes the computer program, it implements the following steps:

[0109] S101: Start the frequency converter cabinet and perform a system self-check.

[0110] S102: After completing the self-check, receive the inverter's operating mode command sent by the touch screen on the inverter cabinet; the inverter cabinet includes multiple inverters, and the inverters are electrically connected to the motors.

[0111] S103: Based on the real-time operating conditions of the ore washing line, the current and speed data of the motor are collected through current sensors and speed sensors.

[0112] S104: Adjust the output frequency of the inverter according to the current and speed data and the working mode command to achieve precise control of the motor speed and current.

[0113] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on its differences from other embodiments. In particular, for hardware + program embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. Although the embodiments in this specification provide the method operation steps as shown in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-inventive means. The order of steps listed in the embodiments is merely one possible execution order among many steps and does not represent the only execution order. In actual device or terminal product execution, the methods can be executed in the order shown in the embodiments or drawings or in parallel (e.g., in a parallel processor or multi-threaded processing environment, or even a distributed data processing environment). The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, product, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, product, or apparatus. Without further limitations, the presence of other identical or equivalent elements in the process, method, product, or apparatus that includes said elements is not excluded. For ease of description, the above devices are described in terms of function, divided into various modules. Of course, in implementing the embodiments of this specification, the functions of each module can be implemented in one or more software and / or hardware, or the module implementing the same function can be implemented by a combination of multiple sub-modules or sub-units, etc. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing device to produce a machine, such that the instructions, which are executable by the processor of the computer or other programmable data processing device, produce instructions for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0114] Those skilled in the art will understand that the embodiments of this specification can be provided as methods, systems, or computer program products. Therefore, the embodiments of this specification can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, the embodiments of this specification can take the form of computer program products implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The various embodiments in this specification are described in a progressive manner, and similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the description of the method embodiments. In the description of this specification, the reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the embodiments of this specification.

[0115] In this specification, the illustrative expressions of the terms used do not necessarily refer to the same embodiments or examples. Furthermore, those skilled in the art can combine and integrate different embodiments or examples described in this specification, as well as features of different embodiments or examples, without contradiction. The above descriptions are merely embodiments of this specification and are not intended to limit the embodiments of this specification. Various modifications and variations can be made to the embodiments of this specification by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the embodiments of this specification should be included within the scope of the claims of the embodiments of this specification.

Claims

1. A variable frequency drive (VFD) output control method suitable for ore washing lines in mines, characterized in that, include: Start the frequency converter cabinet and perform a system self-check; After completing the self-check, it receives the inverter's operating mode command sent by the touch screen on the inverter cabinet; the inverter cabinet includes multiple inverters, and the inverters are electrically connected to the motor. Based on the real-time operating conditions of the ore washing line, the current and speed data of the motor are collected through current sensors and speed sensors; Based on the current and speed data and the operating mode command, the output frequency of the frequency converter is adjusted to achieve precise control of the motor speed and current.

2. The frequency converter cabinet output control method according to claim 1, characterized in that, The step of adjusting the inverter's output frequency based on the current and speed data and the operating mode command includes: The motor speed deviation is calculated based on the current and speed data. Based on the speed deviation and the operating mode in the operating mode command, the output frequency of the frequency converter is dynamically adjusted; the operating modes include: cooperative operating mode and individual operating mode.

3. The frequency converter cabinet output control method according to claim 2, characterized in that, The calculation of the motor speed deviation based on the current and speed data includes: Based on the current and speed data, the deviation between the motor speed and the preset target speed is calculated.

4. The frequency converter cabinet output control method according to claim 2, characterized in that, When the operating mode is the cooperative operating mode, the step of dynamically adjusting the inverter's output frequency based on the speed deviation and the operating mode in the operating mode command includes: Based on the speed deviation, the output frequency of the frequency converter is dynamically adjusted using a PID control algorithm to reduce the gap between the motor speed and the target speed. The process of dynamically adjusting the output frequency of the frequency converter is as follows: based on the load and operating condition data of multiple motors, the output frequency of each frequency converter is adjusted to ensure that the speed and current of multiple motors are coordinated.

5. The frequency converter cabinet output control method according to claim 2, characterized in that, When the operating mode is standalone, the step of dynamically adjusting the inverter's output frequency based on the speed deviation and the operating mode in the operating mode command includes: Based on the speed deviation, the output frequency of the frequency converter is dynamically adjusted using a PID control algorithm to reduce the gap between the motor speed and the target speed. The process of dynamically adjusting the output frequency of the frequency converter is as follows: the output frequency of the corresponding frequency converter is adjusted according to the current and speed data of the motor to ensure that the speed and current of the motor meet the preset requirements.

6. The frequency converter cabinet output control method according to claim 1, characterized in that, Also includes: The current and speed data of the motor are periodically fed back to the touch screen for users to monitor in real time.

7. A frequency converter output control device suitable for a mine washing line, characterized in that, include: The self-checking unit is used to start the frequency converter cabinet and perform a system self-check. The operating mode selection unit is used to receive the operating mode command of the frequency converter sent by the touch screen on the frequency converter cabinet after completing the self-check; the frequency converter cabinet includes multiple frequency converters, and the frequency converters are electrically connected to the motor; The data acquisition unit is used to collect the current and speed data of the motor through current sensors and speed sensors based on the real-time operating conditions of the ore washing line. The motor control unit is used to adjust the output frequency of the frequency converter according to the current and speed data and the operating mode command, so as to achieve precise control of the motor speed and current.

8. The frequency converter cabinet output control device according to claim 7, characterized in that, The motor control unit includes: The speed deviation calculation module is used to calculate the speed deviation of the motor based on the current and speed data; The dynamic frequency adjustment module is used to dynamically adjust the output frequency of the frequency converter based on the speed deviation and the working mode in the working mode command; the working mode includes: cooperative working mode and independent working mode.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the frequency converter output control method for any one of claims 1 to 6 applicable to a mine washing line.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the frequency converter output control method for any one of claims 1 to 6 applicable to a mine washing line.

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