Coal flow-following intelligent starting control method for underground coal mine multi-stage belt conveyor

Abstract

The invention provides a coal-flow-following intelligent starting control method for an underground coal mine multistage belt conveyor, which is applied to a coal-flow-following starting system of the underground coal mine belt conveyor and comprises the following steps: sending a coal-flow-following starting instruction through a centralized control center and triggering a starting process; state self-detection and coal storage detection are conducted on the target belt conveyor and superior equipment of the target belt conveyor, and if the state is abnormal or coal storage exists, failure information is fed back, and the starting process is terminated; the first-stage belt conveyor is started in a variable-frequency soft starting mode, and the starting time is recorded; running parameters and coal quantity distribution data of the belt conveyor are monitored in real time, and starting or stopping of a lower-level belt conveyor is dynamically judged and controlled according to a coal quantity detection result; and when all the target belt conveyors reach the set running speed, sending a coal flow following start completion instruction. Idling operation of the belt conveyor in a non-load state can be effectively avoided, electric energy consumption and equipment loss are reduced, and the energy efficiency and operation safety of an underground coal mine coal transportation system are improved.

Description

Technical Field

[0001] This invention relates to the field of underground coal flow transportation technology, and in particular to an intelligent start-up control method for multi-stage belt conveyors in underground coal mines along the coal flow. Background Technology

[0002] Modern underground coal transportation systems typically employ multiple belt conveyors and underground buffer coal bunkers (if applicable) to achieve continuous and efficient coal transport. These systems are characterized by long transport distances, numerous transfer points, and high transport efficiency, and essentially realize both single-machine and centralized control functions for the belt conveyors. However, domestic coal mine belt conveyor transport mainly uses a reverse coal flow start-up method. The later-stage belt conveyors, which start first, remain in a no-load idling state for extended periods, resulting in significant energy waste and reduced conveyor lifespan. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, the purpose of this invention is to propose an intelligent start-up control method for multi-stage belt conveyors in coal mines that operates in the direction of coal flow.

[0005] To achieve the above objectives, this invention proposes an intelligent start-up control method for multi-stage belt conveyors in coal mines, applied to the start-up system of belt conveyors in coal mines, comprising: The control center sends a coal flow start command and triggers the start process. Perform status self-check and coal storage detection on the target belt conveyor and its upstream equipment. If the status is abnormal or there is coal storage, feedback failure information will be sent and the startup process will be terminated. The first-stage belt conveyor was started using a variable frequency soft start method, and the start-up time was recorded. Real-time monitoring of the operating parameters and coal distribution data of the belt conveyor; dynamic judgment and control of the start or stop of the downstream belt conveyor based on the coal quantity detection results. Once all target belt conveyors have reached their set operating speed, a coal flow start-up completion command is sent.

[0006] Optionally, the coal mine underground belt conveyor coal flow start-up system includes: a belt conveyor, a PLC control box, a coal quantity scanner, a coal quantity scanner electrical control box, a coal quantity calculation center, and a belt conveyor centralized control center, wherein: The belt conveyor control center issues a start command along the coal flow and sends it to the PLC control box through the industrial ring network, thereby controlling the start, stop, acceleration and deceleration of the belt conveyor; At the same time, the PLC control box synchronously feeds back the operating parameters of the belt conveyor to the belt conveyor central control center; The coal quantity scanner and its electrical control box detect the instantaneous coal quantity of the belt conveyor and connect it to the coal quantity calculation center via the industrial ring network. The coal quantity calculation center, in conjunction with the operating parameters of the belt conveyor, calculates the coal quantity distribution map along the direction of the belt conveyor and feeds it back to the belt conveyor central control center.

[0007] Optionally, the coal quantity scanner is installed on the coal quantity scanner mounting frame directly above the belt conveyor, the coal flow scanner control box is fixed on the coal wall near the coal quantity scanner, the coal quantity calculation center includes coal quantity calculation software and corresponding calculation server, and the belt conveyor control center includes control software and corresponding control server. The above devices are connected to each other through signal transmission lines and industrial ring network.

[0008] Optional, also includes: The coal quantity scanner is installed at a height of approximately 2 meters directly above the belt conveyor. The distance L from the installation position of the coal quantity scanner to the head of the conveyor is equal to the time required for the next stage belt conveyor to start up to its maximum operating speed. × Maximum operating speed of the next level belt conveyor .

[0009] The coal quantity scanner detects the distance L between itself and each measurement point on each cross-section in real time. The lidar module inside the coal quantity scanner emits a laser, which is reflected back to the lidar module by the raw coal. The distance from the coal flow surface to the lidar module is obtained by calculating the time of flight of the laser. ,in For the speed of laser flight, For laser flight time; The total number of laser beams emitted by the lidar module is The angle between the edge harness and the horizontal direction is The angle between two adjacent laser beams is The surface area is The blank area of ​​the instantaneous coal flow cross section is The coal quantity calculation center calculates the instantaneous coal flow cross-sectional area of ​​the belt conveyor as follows: .

[0010] Optionally, the step of performing a status self-check and coal storage detection on the target belt conveyor and its upstream equipment, and feeding back a failure message and terminating the startup process if the status is abnormal or if coal storage is present, includes: Perform a status check on all belt conveyors within the coal flow start-up range, including the interlock status of each level of belt conveyor, the alarm status of belt protection devices, and equipment faults; once all belt conveyors pass the status self-check, the next step can be executed; otherwise, provide detailed information on the self-check failures and wait for processing. Based on the coal quantity distribution map along the direction of the belt conveyor calculated by the coal quantity calculation software, it is determined whether there is coal stored on each level of belt conveyor within the coal flow start range. If there is coal stored, a check failure message is fed back, and a coal flow start failure command is issued to prompt the user that the coal flow start operation has failed; if there is no coal stored, the next step of the operation is continued.

[0011] Optionally, the step of starting the first-stage belt conveyor using a frequency conversion soft start method and recording the start-up time further includes: The system determines whether the upstream belt conveyor of the target belt conveyor is in operation based on the operating signals fed back by the PLC controller. If there is no upper-level belt conveyor, i.e. the first-level belt conveyor, the variable frequency motor soft start can be started directly; If there is an upstream belt conveyor that is not running, continue to wait and check until it is running before proceeding to the next step.

[0012] Optionally, real-time monitoring of the belt conveyor's operating parameters and coal distribution data includes: The system monitors the operating parameters of the belt conveyor in real time, including speed, variable frequency motor speed, current, voltage, and power. If the belt conveyor's operating status is abnormal, an alarm is triggered in the belt conveyor's centralized control software. If the belt conveyor starts successfully and reaches the set speed, the system reports that the belt conveyor has started successfully and records the start-up completion time of the belt conveyor at this level. The formula for calculating the amount of coal on the belt conveyor and obtaining the coal quantity distribution on the belt conveyor at each moment is:

[0013] in It is the coal flow density. This refers to the real-time speed of the belt conveyor.

[0014] Optionally, the step of dynamically judging and controlling the start or stop of the lower-level belt conveyor based on the coal quantity detection results includes: When the coal quantity scanner installed above the previous belt conveyor detects the coal flow, the next belt conveyor is immediately started.

[0015] The technical solutions provided by the embodiments of the present invention bring at least the following beneficial effects: they can effectively avoid the idling operation of belt conveyors under no-load conditions, reduce power consumption and equipment wear, and improve the energy efficiency and operational safety of coal transportation systems in underground coal mines.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart illustrating the intelligent start-up control method for a multi-stage belt conveyor in coal mines following the coal flow in an embodiment of the present invention. Figure 2 This is a flowchart of the start-up process of the belt conveyor in the coal flow according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a coal mine underground belt conveyor starting up with the coal flow in an embodiment of the present invention; Figure 4 This is a schematic diagram of the composition of the coal mine underground belt conveyor coal flow start-up system in an embodiment of the present invention; Figure 5 This is a schematic diagram illustrating the principle of coal quantity detection by the coal quantity scanner in an embodiment of the present invention; In the diagram, 1. Coal quantity scanner; 2. Belt conveyor belt; 3. Raw coal. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] To address the shortcomings of current control methods for underground belt conveyors in coal mines, this invention provides an intelligent start-up control method for multi-stage belt conveyors in underground coal mines, operating in the direction of coal flow. Figure 1 and Figure 2 The following are simplified and complex flowcharts of a method for intelligent start-up control of a multi-stage belt conveyor in coal mines following the coal flow, provided in an embodiment of the present invention. The application scenarios of this method are as follows: Figure 3 As shown, this method uses Figure 4 The coal mine underground belt conveyor starts up with the coal flow, as shown in the diagram.

[0020] In one embodiment of the present invention, such as Figure 4As shown, the coal mine underground belt conveyor coal flow start-up system includes: a belt conveyor, a PLC control box, a coal quantity scanner, a coal quantity scanner electrical control box, a coal quantity calculation center, and a belt conveyor centralized control center. The belt conveyor centralized control center issues a coal flow start-up command, which is transmitted to the PLC control box via the industrial ring network, thereby controlling the start, stop, acceleration, and deceleration of the belt conveyor. Simultaneously, the PLC control box synchronously feeds back the operating parameters of the belt conveyor to the belt conveyor centralized control center. The coal quantity scanner and its electrical control box detect the instantaneous coal quantity of the belt conveyor and connect to the coal quantity calculation center via the industrial ring network. The coal quantity calculation center, combined with the operating parameters of the belt conveyor, calculates the coal quantity distribution map along the belt conveyor direction and feeds it back to the belt conveyor centralized control center.

[0021] In this embodiment of the invention, the coal quantity scanner is installed on the coal quantity scanner mounting frame directly above the belt conveyor, the coal flow scanner control box is fixed on the coal wall near the coal quantity scanner, the coal quantity calculation center includes coal quantity calculation software and a corresponding calculation server, and the belt conveyor control center includes control software and a corresponding control server. The above devices are connected to each other through signal transmission lines and industrial ring networks.

[0022] Specifically, the coal quantity scanner is installed at a height of approximately 2 meters directly above the belt conveyor. The distance L from the installation position of the coal quantity scanner to the head of the conveyor is equal to the time required for the next stage belt conveyor to start up to its maximum operating speed. × Maximum operating speed of the next level belt conveyor .

[0023] During application, the coal measurement scanner detects the distance to each measurement point on each cross-section in real time. The coal quantity calculation center calculates the instantaneous cross-sectional area of ​​the coal flow of the belt conveyor. Based on the instantaneous cross-sectional area of ​​the coal flow in the belt conveyor. Combined with the real-time speed of the belt conveyor The total coal flow rate of the belt conveyor was calculated.

[0024] Specifically, the coal quantity scanner detects the distance L between itself and each measurement point on each cross-section in real time. The lidar module inside the coal quantity scanner emits a laser, which is reflected back to the lidar module by the raw coal. The distance from the coal flow surface to the lidar module is obtained by calculating the time of flight of the laser. ,in For the speed of laser flight, The laser flight time is; the total number of laser beams emitted by the lidar module is The angle between the edge harness and the horizontal direction is The angle between two adjacent laser beams is The surface area is The blank area of ​​the instantaneous coal flow cross section is The coal quantity calculation center calculates the instantaneous coal flow cross-sectional area of ​​the belt conveyor as follows: .

[0025] Reference Figure 1 and Figure 2 The coal mine underground belt conveyor start-up control method proposed in this embodiment of the invention specifically includes the following steps: (1) Send the coal flow start command through the central control center and trigger the start process.

[0026] In this embodiment, the coal flow start-up command is sent from the central control center to trigger the start-up process. Specifically, when the belt conveyor control software in the central control center receives a production scheduling command or determines that the start-up conditions are met based on the predetermined start-stop logic, it actively sends a coal flow start-up command to each controlled device in the coal flow system. This start-up command serves as the trigger signal for the entire coal flow start-up process, notifying downstream and related equipment to enter the pre-start-up state.

[0027] After the command is issued, the system invokes the predetermined startup logic step by step, and the central control center uniformly schedules each conveyor and related auxiliary equipment to start in the set order. The issuance of the startup command not only serves as the starting point of the system process, but also plays a role in verifying the legality of the startup link and triggering the acquisition of equipment status, so as to realize the smooth transition of the coal flow system from a static state to an operating state.

[0028] The above methods enable centralized control of the coal flow start-up process, avoiding problems such as asynchronous operation, equipment conflict, or accidental start-up that may occur when manually starting each machine one by one, thereby improving the safety, continuity, and reliability of the entire start-up process.

[0029] (2) Perform status self-inspection and coal storage detection on the target belt conveyor and its upstream equipment. If the status is abnormal or there is coal storage, feedback failure information and terminate the startup process. In this embodiment, the target belt conveyor and its upstream equipment undergo status self-checks and coal storage detection to ensure safe startup with coal flow. If any abnormal state is detected during the self-check or if coal is detected on the belt conveyor, the system immediately reports a startup failure and terminates the startup process, thereby avoiding safety risks caused by the belt conveyor operating with defects or starting under load.

[0030] During the self-check process, the system checks the operating status of each belt conveyor within the coal flow start-up range. The self-check includes the interlocking status of each level of belt conveyor, the alarm status of the belt protection devices, and equipment fault information. Belt protection device alarms include any of the following: tear protection, interlocking protection, belt misalignment protection, smoke alarm, coal pile alarm, abnormal speed, abnormal temperature, slippage protection, longitudinal tear, belt breakage, overheating water spraying, abnormal coal level, and emergency stop along the line. The system compares each protection status to ensure it is within the normal range. Only after all belt conveyors pass the self-check can the coal flow start-up process proceed to the next step. If any belt conveyor has an alarm, interlocking, fault, or emergency stop not reset, the system automatically determines that the self-check has failed and provides detailed feedback to the user regarding the specific equipment that failed and the corresponding abnormal item. The system can only attempt to start the conveyor again after manual troubleshooting or fault elimination.

[0031] After completing the self-check, the system further checks the coal storage on the belt conveyors. Based on the coal distribution map along the belt conveyor direction obtained by the coal quantity calculation software, the system automatically identifies whether there is residual coal on each level of belt conveyor within the coal flow start-up range. If there is residual coal on any belt conveyor, the system immediately reports a check failure and issues a coal flow start-up failure command, clearly indicating to the user that the current coal flow start-up operation has failed and the start-up process needs to be re-executed after coal cleaning is completed or the system confirms there is no load. If no residual coal is detected on any of the belt conveyors, the system automatically determines that the coal storage check has passed, and the coal flow start-up process continues to the next step.

[0032] Through the above implementation methods, the equipment status and load conditions can be automatically detected before the coal flow is started, effectively avoiding forced start-up under abnormal conditions and improving the safety and stability of the belt conveyor system startup process.

[0033] (3) Start the first-stage belt conveyor using the frequency conversion soft start method and record the start time.

[0034] In this embodiment of the application, after the status self-check and coal storage detection are both passed, the system enters the start-up stage of the first-stage belt conveyor and starts up using a frequency conversion soft start method. At the same time, the start-up time is recorded for subsequent logic judgment and process control.

[0035] Before startup, the system first checks the status of the upstream belt conveyor of the target belt conveyor. Based on the operating signals fed back by the PLC controller, the system automatically determines whether the upstream belt conveyor is currently in normal operating condition. If the target belt conveyor does not have an upstream device, i.e., it is the first-stage belt conveyor in the coal flow start-up chain, then there is no need to wait for confirmation from the upstream device, and the system can directly enter the frequency conversion soft start process.

[0036] In this embodiment, the first-stage belt conveyor uses a variable frequency motor for soft starting. The soft starting process involves setting a suitable starting curve in the frequency converter, such as a ramp-up method or an S-shaped acceleration curve, so that the motor gradually accelerates to a stable operating speed with lower voltage and current during the initial acceleration phase. By using variable frequency soft starting, the thermal shock to the motor, grid voltage fluctuations, and torque impact on the mechanical structure caused by excessive instantaneous current in the traditional direct starting mode can be effectively avoided, thereby improving the smoothness of equipment startup and its service life.

[0037] If the target belt conveyor has an upstream device, the system continuously reads the operating status of the upstream belt conveyor before startup. If the upstream belt conveyor is not running, the system will remain in a waiting state and periodically check its operating status; the current belt conveyor can only continue the startup process after the upstream belt conveyor enters normal operating status. When the operating conditions are met, the system starts the belt conveyor according to the frequency converter soft start setting logic and automatically records its startup time. The recorded startup time is used to subsequently determine whether the equipment has completed the startup in sequence and on time, and can also serve as reference information for anomaly backtracking.

[0038] By adopting frequency conversion soft start and combining it with the judgment of the operating status of the upstream belt conveyor, it can be ensured that the belt conveyor starts safely, orderly and smoothly in accordance with the logic set by the system during the coal flow start-up process.

[0039] (4) Monitor the operating parameters and coal distribution data of the belt conveyor in real time, and dynamically judge and control the start or stop of the downstream belt conveyor based on the coal quantity detection results; In this embodiment of the application, during and after the start-up of the belt conveyor, the system monitors its operating parameters and coal quantity distribution in real time, and dynamically determines the start-up or stop of the next-level belt conveyor based on the coal quantity detection results, thereby ensuring the coordination and safety of the entire coal flow system.

[0040] The system first continuously monitors the operating parameters of the belt conveyor, including key indicators such as the conveyor's operating speed, variable frequency motor speed, current, voltage, and output power. If the system detects any abnormalities in the conveyor's operating status during monitoring, such as speed deviation, current overload, voltage anomaly, power surge, or inverter failure, the centralized control software will immediately issue an alarm to alert the on-duty personnel for handling. If the belt conveyor successfully completes a soft start and reaches the preset operating speed, the system will automatically report the start-up completion information and record the start-up completion time for subsequent logical judgment and start-up sequence control.

[0041] While monitoring operating parameters, the system calculates the coal quantity of the belt conveyor in real time to obtain the coal quantity distribution at any given moment. The instantaneous coal quantity distribution on the belt conveyor can be calculated using the following formula:

[0042] in It is the coal flow density. This refers to the effective cross-sectional area coefficient or coal flow coverage area of ​​the belt conveyor at time t. This represents the real-time speed of the belt conveyor. By calculating the above integral expression in real time, the system can generate dynamic coal quantity distribution data along the direction of the belt conveyor, providing a basis for judging the start-stop control of the downstream belt conveyor.

[0043] In this embodiment, when the coal quantity scanner installed above the upper-level belt conveyor detects that the coal flow has reached its scanning position, the system immediately determines that the lower-level belt conveyor is ready to start and automatically starts the lower-level belt conveyor to ensure that the coal flow can be continuously, uniformly, and without accumulation from the upper level to the lower level equipment. If the coal flow has not reached the scanner's monitoring position, the system continues to maintain the monitoring state and does not start the lower-level belt conveyor temporarily to avoid the lower-level equipment running idle or causing energy waste.

[0044] Through the above methods, this application realizes dynamic linkage control of coal flow based on real-time operating parameters and coal distribution data, enabling the downstream belt conveyor to start or stop intelligently according to the actual coal flow conditions, thereby improving the operating efficiency and safety of the belt conveyor system and avoiding problems such as coal pile-up, blockage, or belt damage caused by asynchronous operation of equipment.

[0045] (5) When all target belt conveyors reach the set operating speed, send the coal flow start completion command.

[0046] In this embodiment, after all target belt conveyors within the coal flow range are put into operation using variable frequency soft start, the system continuously monitors the speed of the variable frequency motors of each belt conveyor to determine whether they have reached the set rated operating speed. The variable frequency motor speed is the core criterion for whether the belt conveyor has entered a stable operating condition. When the system detects that the motor speed has not reached the set speed, it continues to collect and judge data in real time until the speed reaches the predetermined value.

[0047] When any belt conveyor reaches its set speed, the system automatically records its start-up completion time. This time information serves as an indicator that the belt conveyor has successfully entered a stable operating state and can also be used for subsequent operation analysis, fault tracing, and start-up / shutdown sequence optimization. Once all target belt conveyors within the coverage area of ​​the coal flow start command have reached their set operating speeds, the system automatically determines that the entire coal flow start-up process has been successfully completed.

[0048] Once the control system determines that all belt conveyors in the coal flow have reached their operating speed, it sends a coal flow start-up completion command. This command clearly informs the user that the coal flow start-up operation has been completed, and all belt conveyors are in a normal and stable operating state, ready for formal operation. In this way, the system achieves closed-loop monitoring and confirmation of the entire coal flow start-up process, avoiding the mistaken assumption of start-up completion due to individual belt conveyors not yet reaching their operating state, thus improving the safety and accuracy of the coal flow system's commissioning.

[0049] It should be noted that, in the description of this invention, any process or method described in the flowcharts or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order according to the functions involved, as should be understood by those skilled in the art to which the embodiments of the invention pertain.

[0050] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for intelligent start-up control of a multi-stage belt conveyor in coal mines along the coal flow, characterized in that, Applications include: Coal-flow start-up systems for belt conveyors in underground coal mines, including: The control center sends a coal flow start command and triggers the start process. Perform status self-check and coal storage detection on the target belt conveyor and its upstream equipment. If the status is abnormal or there is coal storage, feedback failure information will be sent and the startup process will be terminated. The first-stage belt conveyor was started using a variable frequency soft start method, and the start-up time was recorded. Real-time monitoring of the operating parameters and coal distribution data of the belt conveyor; dynamic judgment and control of the start or stop of the downstream belt conveyor based on the coal quantity detection results. Once all target belt conveyors have reached their set operating speed, a coal flow start-up completion command is sent.

2. The method according to claim 1, characterized in that, The coal mine underground belt conveyor coal flow start-up system includes: a belt conveyor, a PLC control box, a coal quantity scanner, a coal quantity scanner electrical control box, a coal quantity calculation center, and a belt conveyor centralized control center, wherein: The belt conveyor control center issues a start command along the coal flow and sends it to the PLC control box through the industrial ring network, thereby controlling the start, stop, acceleration and deceleration of the belt conveyor; At the same time, the PLC control box synchronously feeds back the operating parameters of the belt conveyor to the belt conveyor central control center; The coal quantity scanner and its electrical control box detect the instantaneous coal quantity of the belt conveyor and connect it to the coal quantity calculation center via the industrial ring network. The coal quantity calculation center, in conjunction with the operating parameters of the belt conveyor, calculates the coal quantity distribution map along the direction of the belt conveyor and feeds it back to the belt conveyor central control center.

3. The method according to claim 2, characterized in that, The coal quantity scanner is installed on the coal quantity scanner mounting frame directly above the conveyor belt. The coal flow scanner control box is fixed on the coal wall near the coal quantity scanner. The coal quantity calculation center includes coal quantity calculation software and a corresponding calculation server. The belt conveyor control center includes control software and a corresponding control server. The above devices are connected to each other through signal transmission lines and industrial ring networks.

4. The method according to claim 3, characterized in that, Also includes: The coal quantity scanner is installed at a height of approximately 2 meters directly above the belt conveyor. The distance L from the installation position of the coal quantity scanner to the head of the conveyor is equal to the time required for the next stage belt conveyor to start up to its maximum operating speed. × Maximum operating speed of the next level belt conveyor . The coal quantity scanner detects the distance L between itself and each measurement point on each cross-section in real time. The lidar module inside the coal quantity scanner emits a laser, which is reflected back to the lidar module by the raw coal. The distance from the coal flow surface to the lidar module is obtained by calculating the time of flight of the laser. ,in For the speed of laser flight, For laser flight time; The total number of laser beams emitted by the lidar module is The angle between the edge harness and the horizontal direction is The angle between two adjacent laser beams is The surface area is The blank area of ​​the instantaneous coal flow cross section is The coal quantity calculation center calculates the instantaneous coal flow cross-sectional area of ​​the belt conveyor as follows: .

5. The method according to claim 4, characterized in that, The process of performing status self-checks and coal storage checks on the target belt conveyor and its upstream equipment, and feeding back failure information and terminating the startup process if the status is abnormal or if coal storage is present, includes: Perform a status check on all belt conveyors within the coal flow start-up range, including the interlock status of each level of belt conveyor, the alarm status of belt protection devices, and equipment faults; once all belt conveyors pass the status self-check, the next step can be executed; otherwise, provide detailed information on the self-check failures and wait for processing. Based on the coal quantity distribution map along the direction of the belt conveyor calculated by the coal quantity calculation software, it is determined whether there is coal stored on each level of belt conveyor within the coal flow start range. If there is coal stored, a check failure message is fed back, and a coal flow start failure command is issued to prompt the user that the coal flow start operation has failed; if there is no coal stored, the next step of the operation is continued.

6. The method according to claim 5, characterized in that, The method of starting the first-stage belt conveyor using a frequency conversion soft start and recording the start-up time also includes: The system determines whether the upstream belt conveyor of the target belt conveyor is in operation based on the operating signals fed back by the PLC controller. If there is no upper-level belt conveyor, i.e. the first-level belt conveyor, the variable frequency motor soft start can be started directly; If there is an upstream belt conveyor that is not running, continue to wait and check until it is running before proceeding to the next step.

7. The method according to claim 6, characterized in that, Real-time monitoring of the operating parameters and coal quantity distribution data of the belt conveyor, including: The system monitors the operating parameters of the belt conveyor in real time, including speed, variable frequency motor speed, current, voltage, and power. If the belt conveyor's operating status is abnormal, an alarm is triggered in the belt conveyor's centralized control software. If the belt conveyor starts successfully and reaches the set speed, the system reports that the belt conveyor has started successfully and records the start-up completion time of the belt conveyor at this level. The formula for calculating the amount of coal on the belt conveyor and obtaining the coal quantity distribution on the belt conveyor at each moment is: in It is the coal flow density. This refers to the real-time speed of the belt conveyor.

8. The method according to claim 7, characterized in that, The method of dynamically judging and controlling the start or stop of the lower-level belt conveyor based on the coal quantity detection results includes: When the coal quantity scanner installed above the previous belt conveyor detects the coal flow, the next belt conveyor is immediately started.

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