Roller screen protection method and system based on intelligent control

Abstract

The invention discloses a roller screen protection method and system based on intelligent control, and relates to the technical field of roller screens, and the method comprises the following specific steps: establishing a multi-modal data acquisition framework, acquiring multi-modal data of a roller screen in real time, transmitting the multi-modal data of the roller screen to a control system, and forming a multi-modal database of the roller screen; a control system is used for analyzing and processing multi-modal data of the roller screen, when it is sensed that a feeding vehicle approaches, a barrier gate is automatically opened, discharging is conducted after the feeding vehicle enters the barrier gate, meanwhile, the roller screen is started, after screening is completed, the roller screen is stopped, and in the screening process of the roller screen, the control system combines the multi-modal data of the roller screen to control the feeding vehicle to enter the barrier gate. And the audible and visual alarm is controlled to perform early warning based on the early warning strategy. According to the invention, the working state of the roller screen is monitored in real time by utilizing the change of the multi-modal data of the roller screen, meanwhile, timely early warning is carried out, the phenomenon of response lag is avoided, and automatic unblocking can be carried out.

Description

Technical Field

[0001] This invention relates to the field of roller screen technology, and in particular to a method and system for protecting roller screens based on intelligent control. Background Technology

[0002] A roller screen is a sorting device consisting of multiple parallel rollers with staggered screen discs mounted on them. The rollers rotate via sprockets or gears, with the rotation direction aligned with the material flow direction. Each screen shaft is driven by a separate motor. The screen discs are arranged in a staggered, quincunx or hexagonal pattern to minimize dead angles during screening. A safety device prevents material from jamming the shafts. The equipment is available in pedestal-mounted, left-right drive types, with some models equipped with casters. The screen surface inclination angle decreases along the material flow direction to achieve equal thickness screening [1-3]. Applicable materials include coal, sand, gravel, and construction waste.

[0003] Roller screens are widely used in industries such as coal, mining, and metallurgy for screening medium to coarse-grained materials. However, traditional roller screens have the following problems:

[0004] 1. High risk of material blockage: Sticky or oversized materials can easily cause blockage, increase the motor load, and even burn out the drive system;

[0005] 2. High dependence on manual labor: It relies on manual inspections, making it difficult to monitor equipment status in real time, resulting in delayed fault response;

[0006] Therefore, we propose a protection method and system for roller screens based on intelligent control. Summary of the Invention

[0007] The purpose of this invention is to provide a method and system for protecting roller screens based on intelligent control, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] In a first aspect, the present invention provides a method for protecting a roller screen based on intelligent control, comprising the following specific steps:

[0010] Step 1: Establish a multimodal data acquisition framework, collect multimodal data of the roller screen in real time, transmit the multimodal data of the roller screen to the control system, and form a multimodal database of the roller screen;

[0011] Step 2: Analyze and process the multimodal data of the roller screen using the control system;

[0012] Step 3: When a loading vehicle is detected approaching, the barrier gate opens automatically. After the loading vehicle enters the barrier gate, it unloads the material. At the same time, the roller screen starts. When the screening is completed, the roller screen stops.

[0013] Step 4: During the roller screen screening process, the control system combines the multi-modal data of the roller screen and controls the audible and visual alarms to issue warnings based on the early warning strategy.

[0014] Step 5: During the roller screen screening process, the control system controls the drive device based on the feedback of the roller screen multimodal data, and uses the drive device to adjust the speed and direction of the screen shaft motor.

[0015] Step 6: The control system interacts with the factory's manufacturing execution system and cloud platform based on communication protocols to perform remote monitoring and big data analysis.

[0016] Preferably, the multimodal data acquisition framework in step 1 specifically includes:

[0017] A vibration sensor is used to collect vibration signals at the screen shaft bearing housing in real time.

[0018] Temperature sensor, used to acquire bearing temperature signal and reducer temperature signal in real time;

[0019] A current sensor is used to collect the motor's operating current in real time;

[0020] A visual inspection device is used to identify large foreign objects and severe material blockage.

[0021] Preferably, the vibration sensor is deployed on the bearing housing of each screen shaft;

[0022] The temperature sensor is attached to the bearing housing and the surface of the reducer;

[0023] The current sensor is integrated into the power circuit of the main drive motor;

[0024] The visual inspection device includes an industrial camera and a supplementary light, with the industrial camera aimed at the material flow on the screen surface.

[0025] Preferably, the early warning strategy includes two early warning modes, namely a first early warning mode and a second early warning mode;

[0026] The first warning mode: Set the temperature threshold to X, set the temperature collected in real time by the temperature sensor to a, when a is rising slowly and continuously, and the vibration sensor collects an increase in amplitude at a specific frequency, when a≥X, the control system controls the sound and light alarm to sound an alarm.

[0027] The second warning mode: Set the temperature change threshold for a certain time period as Y, set the temperature collected by the temperature sensor in real time as A, and capture the temperature data collected by the temperature sensor in real time within a certain time period T based on the capture strategy. Set the temperature data at the beginning of the time period as A1 and the temperature data at the end of the time period as A2. Then, substitute A1, A2 and T into the temperature change amplitude calculation formula to obtain the temperature change amplitude factor, which is set as K. When the vibration sensor detects an increase in amplitude at a specific frequency and K≥Y, the control system controls the sound and light alarm to sound an alarm.

[0028] Preferably, the formula for calculating the temperature change range is:

[0029] K = (A2 - A1) / T;

[0030] Where K is the temperature change amplitude factor, A1 is the temperature data at the beginning of time period T, A2 is the temperature data at the end of time period T, and the unit of T is seconds.

[0031] Preferably, the specific content of the crawling strategy is as follows:

[0032] Let the time period for the first capture be T1, the time period for the second capture be T2, the time period for the third capture be T3, the time period for the fourth capture be T4, and so on until the time period for the Nth capture is T. N The time interval between T1 and T2 is t / 2, the time interval between T2 and T3 is t, and the time interval between T3 and T4 is t / 2. The intervals t / 2 and t are cyclically set until T... N .

[0033] Preferably, step 3 specifically includes:

[0034] Step 3.1: Install a vehicle sensor and an automatically lifting barrier at the entrance of the receiving pit;

[0035] Step 3.2: When the vehicle sensor detects that a loading vehicle is approaching, the control system controls the barrier gate to rise and open, and at the same time sends a delayed start signal to the roller screen, so that the roller screen starts after a delay.

[0036] Step 3.3: Then the loading vehicle begins unloading, and the material is screened using a roller screen;

[0037] Step 3.4: After the loading vehicle finishes unloading, the control system controls the gate to lower and close after the vehicle leaves, based on the vehicle sensor's detection of the vehicle's departure. At the same time, the control system determines whether the roller screen is in an unloaded state based on the current sensor's collection of current changes. If it is in an unloaded state, the control system controls the roller screen to stop running.

[0038] Preferably, step 5 specifically includes:

[0039] Step 5.1: During the screening process of the roller screen, the control system analyzes and processes the current data of the current sensor. If the load of the roller screen continues to increase, the control system controls the drive device to reduce the speed of the screen shaft motor in order to increase the shearing force.

[0040] Step 5.2: During the screening process of the roller screen, when the vision inspection device detects the accumulation of material on the screen surface, the control system controls the drive device to reduce the speed of the screen shaft motor in order to increase the shearing force.

[0041] Step 5.3: If the roller screen load continues to increase or material accumulates on the screen surface after the screen shaft motor has reduced its speed for a period of time, the control system will control the drive device to briefly reverse the screen shaft motor to discharge the material.

[0042] Preferably, step 6 specifically includes:

[0043] Step 6.1: Combine the changes in current data from the current sensor and analyze and process them through the control system;

[0044] Step 6.2: The control system exchanges data with the factory's manufacturing execution system via a communication protocol;

[0045] Step 6.3: The factory manufacturing execution system adjusts the feeding amount of the upstream feeder in conjunction with the system.

[0046] Secondly, the present invention provides a roller screen protection system based on intelligent control, which is implemented as described above in the roller screen protection method based on intelligent control. The system specifically includes the following:

[0047] A data acquisition module is used to acquire multimodal data of the roller screen. The data acquisition module includes a temperature sensor, a vibration sensor, a current sensor, and a vision inspection device.

[0048] The control system is used to analyze and process the multimodal data of the roller screen collected by the data acquisition module and issue control commands.

[0049] A drive unit, which is controlled by a control system to adjust the speed and direction of the screen shaft motor;

[0050] The communication module enables data interaction between the control system, the factory manufacturing execution system, and the cloud platform based on a communication protocol.

[0051] The barrier gate and vehicle sensing device are controlled by a control system to achieve automatic raising and lowering of the barrier gate;

[0052] A human-computer interaction display screen is used to interact with the control system.

[0053] The technical effects and advantages of this invention are as follows:

[0054] 1. This invention establishes a multimodal data acquisition framework to collect multimodal data of the roller screen in real time, forming a multi-directional data acquisition method. This improves the judgment accuracy of the control system, reduces the risk of misjudgment by the control system due to single-modal data, and enables real-time monitoring of the working status of the roller screen, reducing reliance on manual inspection. During the roller screen screening process, the control system combines the multimodal data of the roller screen and controls the audible and visual alarms based on the early warning strategy. This allows the control system to make timely judgments and warnings on the status of the roller screen based on the changes in the multimodal data collected in real time, thus facilitating timely intervention and avoiding response lag.

[0055] 2. When a feeding vehicle approaches, the barrier gate opens automatically. After the feeding vehicle enters the barrier gate, it unloads the material, and the roller screen starts at the same time. After the feeding vehicle leaves, the barrier gate closes. When screening is completed, if the roller screen is in an unloaded state, the roller screen stops. This can realize automatic start and stop and automatic screening, reducing reliance on manual control, and also reducing the load on the roller screen and the waste of energy.

[0056] 3. If the load on the roller screen continues to increase, or if the vision inspection device detects material accumulation on the screen surface, the control system controls the drive device to reduce the speed of the screen shaft motor to increase the shearing force, thereby breaking up large pieces of material or blocked material, thus clearing the blockage. Alternatively, the control system can control the drive device to briefly reverse the screen shaft motor to discharge the material, thus clearing the blockage. This design uses the control system to control the drive device to reduce the speed or reverse the screen shaft, thereby clearing the blockage and reducing the risk of material blockage. Attached Figure Description

[0057] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0058] Figure 1 This is a schematic diagram of the intelligent control-based roller screen protection method of the present invention. Detailed Implementation

[0059] 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.

[0060] This invention provides, for example Figure 1 The intelligent control-based roller screen protection method shown includes the following specific steps:

[0061] Step 1: Establish a multimodal data acquisition framework, collect multimodal data of the roller screen in real time, transmit the multimodal data of the roller screen to the control system, and form a multimodal database of the roller screen;

[0062] Step 2: Analyze and process the multimodal data of the roller screen using the control system;

[0063] Step 3: When a loading vehicle is detected approaching, the barrier gate opens automatically. After the loading vehicle enters the barrier gate, it unloads the material. At the same time, the roller screen starts. When the screening is completed, the roller screen stops.

[0064] Step 4: During the roller screen screening process, the control system combines the multi-modal data of the roller screen and controls the audible and visual alarms to issue warnings based on the early warning strategy.

[0065] Step 5: During the roller screen screening process, the control system controls the drive device based on the feedback of the roller screen multimodal data, and uses the drive device to adjust the speed and direction of the screen shaft motor.

[0066] Step 6: The control system interacts with the factory's manufacturing execution system and cloud platform based on communication protocols to perform remote monitoring and big data analysis.

[0067] By establishing a multimodal data acquisition framework, multimodal data of the roller screen is collected in real time and transmitted to the control system, forming a multimodal database of the roller screen. The control system then analyzes and processes this multimodal data, facilitating its acquisition and creating a multi-faceted data acquisition method. This improves the accuracy of the control system's judgment, reduces the risk of misjudgment caused by single-modal data, and enables real-time monitoring of the roller screen's operating status, reducing reliance on manual inspection. When a loading vehicle approaches, the barrier automatically opens, allowing the vehicle to unload and simultaneously starting the roller screen. After screening is complete, the roller screen stops, achieving automatic start / stop and automatic screening, reducing reliance on manual control. This reduces the load on the roller screen and energy waste. During the roller screen screening process, the control system combines multimodal data from the roller screen and uses an early warning strategy to control the audible and visual alarms for early warning. This allows the control system to promptly judge and warn about the status of the roller screen based on real-time changes in multimodal data, facilitating timely intervention and avoiding response lag. Furthermore, during the roller screen screening process, the control system uses feedback from the multimodal data to control the drive device, adjusting the speed and direction of the screen shaft motor. This allows for timely feedback on whether material blockage has occurred, and by adjusting the speed and direction of the screen shaft motor using the drive device, blockage can be cleared, preventing excessive material blockage, increased motor load, and even damage to the roller screen.

[0068] Furthermore, the specific contents of the multimodal data acquisition framework in step 1 are as follows: vibration sensor, which is used to collect vibration signals at the screen shaft bearing seat in real time, and to collect and transmit abnormal vibration signals caused by bearing wear, screen shaft imbalance, misalignment and initial jamming to the control system.

[0069] Temperature sensors are used to collect bearing temperature signals and reducer temperature signals in real time. By collecting bearing temperature in real time, the control system can monitor the temperature changes of the bearing in real time, thus facilitating the timely issuance of control commands.

[0070] The current sensor is used to collect the motor's operating current in real time. By collecting changes in the motor's operating current in real time, the control system can determine the working status of the roller screen, such as whether it is in an overloaded or unloaded state, so that the control system can issue control commands in a timely manner.

[0071] The visual inspection device is used to identify large foreign objects and severe material blockage. By acquiring images during screening, the device can determine whether there are large foreign objects or severe material blockage, thus enabling the control system to promptly control the drive device and adjust the speed and direction of the screen shaft motor to clear the blockage.

[0072] Furthermore, vibration sensors are deployed on the bearing seats of each screen shaft to facilitate real-time monitoring of the vibration of the bearing seats of each screen shaft, thereby achieving all-round monitoring, improving the accuracy of early warning strategies, and making it easier to fully grasp the changes in the vibration amplitude of each screen shaft.

[0073] Temperature sensors are attached to the bearing housing and the surface of the reducer; this facilitates real-time temperature monitoring of critical components such as bearings and reducers, thereby improving the accuracy of early warning strategies.

[0074] The current sensor is integrated into the main drive motor power circuit; it can easily and accurately grasp the working status of the roller screen, such as whether it is in an overload state or an unload state.

[0075] The visual inspection device includes an industrial camera and a supplementary light, with the industrial camera aimed at the material flow on the screen surface; supplementary lighting is provided by the supplementary light to improve the accuracy of the images of the material flow on the screen surface captured by the industrial camera, thereby improving the accuracy of determining whether there is a blockage.

[0076] Furthermore, the early warning strategy includes two early warning modes, namely the first early warning mode and the second early warning mode;

[0077] The first warning mode: Set the temperature threshold to X, set the temperature collected in real time by the temperature sensor to a, when a is rising slowly and continuously, and the vibration sensor collects an increase in amplitude at a specific frequency, when a≥X, the control system controls the sound and light alarm to sound an alarm.

[0078] The second early warning mode: A temperature change threshold of Y is set for a certain time period, and the temperature collected in real-time by the temperature sensor is set to A. Based on a capture strategy, the temperature data collected by the temperature sensor within a certain time period T is captured in real-time. The temperature data at the beginning of this time period is set as A1, and the temperature data at the end of this time period is set as A2. Then, A1, A2, and T are substituted into the temperature change amplitude calculation formula to obtain the temperature change amplitude factor, which is set to K. When the vibration sensor detects an increase in amplitude at a specific frequency, and K ≥ Y, the control system controls the audible and visual alarm to sound an alarm. The temperature change amplitude calculation formula is:

[0079] K = (A2 - A1) / T;

[0080] Where K is the temperature change amplitude factor, A1 is the temperature data at the beginning of time period T, A2 is the temperature data at the end of time period T, and the unit of T is seconds.

[0081] For the first warning mode: the temperature threshold is set to 60 degrees Celsius, and the initial real-time temperature collected by the temperature sensor is set to 15 degrees Celsius. When the temperature continues to rise slowly and the vibration sensor detects an increase in amplitude at a specific frequency, and the initial real-time temperature collected by the temperature sensor reaches 61 degrees Celsius, the control system activates the audible and visual alarm. This indicates early bearing wear, and manual intervention is required to troubleshoot the problem. It should be noted that if there is only a slow and continuous rise in temperature or an increase in amplitude at a specific frequency detected by the vibration sensor, it does not necessarily indicate early bearing wear, and no warning will be issued. In this case, manual data analysis is required to identify and resolve other faults.

[0082] For the first warning mode: Set the temperature change threshold for a certain time period to 0.1 degrees / second. Based on the capture strategy, capture the temperature data collected by the temperature sensor within 10 seconds in real time. Set the temperature data at the beginning of the time period to 10 degrees and the temperature data at the end of the time period to 30 degrees. Then substitute 10, 30 and 10 into the temperature change amplitude calculation formula, K=(30-10) / 10, and obtain the temperature change amplitude factor K as 0.2 degrees / second. At the same time, the vibration sensor collects the amplitude increase of a specific frequency. At this time, the control system controls the sound and light alarm to issue an alarm.

[0083] Furthermore, the specific details of the crawling strategy are as follows:

[0084] Let the time period for the first capture be T1, the time period for the second capture be T2, the time period for the third capture be T3, the time period for the fourth capture be T4, and so on until the time period for the Nth capture is T. N The time interval between T1 and T2 is t / 2, the time interval between T2 and T3 is t, and the time interval between T3 and T4 is t / 2. The intervals t / 2 and t are cyclically set until T... N .

[0085] For example, if the first capture period is 10 seconds and t is set to 6 seconds, then the control system will capture the second 10-second period 3 seconds after the first capture. The third capture will be 6 seconds after the second capture, and the fourth capture will be 3 seconds after the third capture, again 10 seconds later. This cycle of 6-second and 3-second intervals will continue. It's important to note that the capture strategy is real-time. For instance, if the first capture period is 0 to 10 seconds, the second capture will begin after a 3-second interval (i.e., after 13 seconds) and end after 23 seconds. Real-time capture ensures the accuracy and timeliness of temperature data, avoiding delayed responses. The time intervals prevent cross-influence of temperature data, which could affect the warning results of the alert strategy, and also reduce the computational load. Furthermore, t must be less than T to ensure the captured temperature data is reliable.

[0086] Furthermore, step 3 specifically includes the following:

[0087] Step 3.1: Install a vehicle sensor and an automatically lifting barrier at the entrance of the receiving pit;

[0088] Step 3.2: When the vehicle sensor detects that a loading vehicle is approaching, the control system controls the barrier gate to rise and open, and at the same time sends a delayed start signal to the roller screen, so that the roller screen starts after a delay.

[0089] Step 3.3: Then the loading vehicle begins unloading, and the material is screened using a roller screen;

[0090] Step 3.4: After the loading vehicle finishes unloading, the control system controls the gate to lower and close after the vehicle leaves, based on the vehicle sensor's detection of the vehicle's departure. At the same time, the control system determines whether the roller screen is in an unloaded state based on the current sensor's collection of current changes. If it is in an unloaded state, the control system controls the roller screen to stop running.

[0091] A vehicle sensor and an automatically raising / lowering barrier are pre-installed at the entrance of the receiving pit. The specific structure of the vehicle sensor can be obtained from existing technology. The vehicle sensor is mainly used to detect whether a loading vehicle is approaching. When the vehicle sensor detects an approaching loading vehicle, it sends a signal to the control system. The control system then raises and opens the barrier, simultaneously sending a delayed start signal to the roller screen. For example, if the control system sends a signal to the roller screen to start after a five-second delay, the roller screen will automatically start five seconds after the control system sends the start signal, and then the loading vehicle will proceed. Upon reaching the designated location, unloading begins. Material is fed from the upstream feeder and screened using a roller screen. Once the loading vehicle has finished unloading, the control system receives a signal from the vehicle sensor indicating that the vehicle has left and controls the barrier gate to descend and close. Simultaneously, based on current sensor data, the control system determines whether the roller screen is in an unloaded state when the current is at rest. If it is, the control system stops the roller screen. This design enables automatic start and stop of the roller screen, reducing the hassle of manual operation and dependence on human labor, thereby achieving automated screening.

[0092] Furthermore, step 5 specifically includes the following:

[0093] Step 5.1: During the screening process of the roller screen, the control system analyzes and processes the current data of the current sensor. If the load of the roller screen continues to increase, the control system controls the drive device to reduce the speed of the screen shaft motor in order to increase the shearing force.

[0094] Step 5.2: During the screening process of the roller screen, when the vision inspection device detects the accumulation of material on the screen surface, the control system controls the drive device to reduce the speed of the screen shaft motor in order to increase the shearing force.

[0095] Step 5.3: If the roller screen load continues to increase or material accumulates on the screen surface after the screen shaft motor has reduced its speed for a period of time, the control system will control the drive device to briefly reverse the screen shaft motor to discharge the material.

[0096] During the roller screen screening process, the control system analyzes and processes the current data from the current sensor. If the load on the roller screen continues to increase, or if the vision detection device detects material accumulation on the screen surface, the control system controls the drive device to reduce the speed of the screen shaft motor to increase the shearing force, thereby breaking up large pieces of material or blocked material, thus clearing the blockage. If, after the screen shaft motor has reduced its speed for a period of time, the roller screen load continues to increase or material accumulates on the screen surface, the control system controls the drive device to briefly reverse the screen shaft motor, for example, for 0.5 to 2 seconds, to discharge the material, thus clearing the blockage. This design uses the control system to control the drive device to reduce the speed or reverse the screen shaft, thereby clearing the blockage and reducing the risk of material blockage.

[0097] Furthermore, step 6 specifically includes:

[0098] Step 6.1: Combine the changes in current data from the current sensor and analyze and process them through the control system;

[0099] Step 6.2: The control system exchanges data with the factory's manufacturing execution system via a communication protocol;

[0100] Step 6.3: The factory manufacturing execution system adjusts the feeding amount of the upstream feeder in conjunction with the system.

[0101] By combining the changes in current data from the current sensor and analyzing and processing them through the control system (e.g., if the current data decreases), the control system exchanges data with the factory manufacturing execution system through a communication protocol. The factory manufacturing execution system then increases the feeding amount of the upstream feeders (such as vibrating feeders and belt conveyors), thereby enabling the roller screen to operate fully under optimal load. This not only avoids affecting the lifespan of the roller screen but also adaptively adjusts its working efficiency.

[0102] The intelligent control roller screen protection system implements the above-mentioned intelligent control roller screen protection method. The system specifically includes the following components:

[0103] The data acquisition module is used to collect multimodal data from the roller screen. The data acquisition module includes a temperature sensor, a vibration sensor, a current sensor, and a vision inspection device.

[0104] The control system is used to analyze and process the multimodal data of the roller screen collected by the data acquisition module and issue control commands. The control system can be a PLC control system, which is responsible for high-speed acquisition of all sensor data, execution of low-level logic control, and running built-in intelligent algorithms (such as fuzzy PID and deep learning diagnostic models).

[0105] The drive unit is controlled by the control system to adjust the speed and direction of the screen shaft motor. The drive unit can be a frequency converter, which is connected to the screen shaft motor to control the start, stop, speed and direction of the screen shaft motor.

[0106] The communication module enables data interaction between the control system, the factory manufacturing execution system, and the cloud platform based on communication protocols. It supports multiple industrial protocols (such as Profinet and Modbus-TCP), achieving seamless data interaction between the PLC control system and the factory manufacturing execution system and the cloud platform, and providing a channel for remote monitoring and big data analysis.

[0107] The barrier gate and vehicle sensing device are controlled by a control system to achieve automatic raising and lowering of the barrier gate;

[0108] Human-machine interface (HMI) displays are used to interact with the control system. They are installed on-site or in the central control room to provide operators with an intuitive overview of equipment status, real-time / historical data curves, alarm information records, and parameter setting interfaces.

[0109] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for protecting roller screens based on intelligent control, characterized in that, The specific steps include the following: Step 1: Establish a multimodal data acquisition framework, collect multimodal data of the roller screen in real time, transmit the multimodal data of the roller screen to the control system, and form a multimodal database of the roller screen; Step 2: Analyze and process the multimodal data of the roller screen using the control system; Step 3: When a loading vehicle is detected approaching, the barrier gate opens automatically. After the loading vehicle enters the barrier gate, it unloads the material. At the same time, the roller screen starts. When the screening is completed, the roller screen stops. Step 4: During the roller screen screening process, the control system combines the multi-modal data of the roller screen and controls the audible and visual alarms to issue warnings based on the early warning strategy. Step 5: During the roller screen screening process, the control system controls the drive device based on the feedback of the roller screen multimodal data, and uses the drive device to adjust the speed and direction of the screen shaft motor. Step 6: The control system interacts with the factory's manufacturing execution system and cloud platform based on communication protocols to perform remote monitoring and big data analysis.

2. The intelligent control-based roller screen protection method according to claim 1, characterized in that, The specific content of the multimodal data acquisition framework in step 1 is as follows: A vibration sensor is used to collect vibration signals at the screen shaft bearing housing in real time. Temperature sensor, used to acquire bearing temperature signal and reducer temperature signal in real time; A current sensor is used to collect the motor's operating current in real time; A visual inspection device is used to identify large foreign objects and severe material blockage.

3. The intelligent control-based roller screen protection method according to claim 2, characterized in that, The vibration sensors are deployed on the bearing seats of each screen shaft; The temperature sensor is attached to the bearing housing and the surface of the reducer; The current sensor is integrated into the power circuit of the main drive motor; The visual inspection device includes an industrial camera and a supplementary light, with the industrial camera aimed at the material flow on the screen surface.

4. The intelligent control-based roller screen protection method according to claim 3, characterized in that, The early warning strategy includes two early warning modes, namely the first early warning mode and the second early warning mode; The first warning mode: Set the temperature threshold to X, set the temperature collected in real time by the temperature sensor to a, when a is rising slowly and continuously, and the vibration sensor collects an increase in amplitude at a specific frequency, when a≥X, the control system controls the sound and light alarm to sound an alarm. The second warning mode: Set the temperature change threshold for a certain time period as Y, set the temperature collected by the temperature sensor in real time as A, and capture the temperature data collected by the temperature sensor in real time within a certain time period T based on the capture strategy. Set the temperature data at the beginning of the time period as A1 and the temperature data at the end of the time period as A2. Then, substitute A1, A2 and T into the temperature change amplitude calculation formula to obtain the temperature change amplitude factor, which is set as K. When the vibration sensor detects an increase in amplitude at a specific frequency and K≥Y, the control system controls the sound and light alarm to sound an alarm.

5. The intelligent control-based roller screen protection method according to claim 4, characterized in that, The formula for calculating the temperature change range is: K = (A2 - A1) / T; Where K is the temperature change amplitude factor, A1 is the temperature data at the beginning of time period T, A2 is the temperature data at the end of time period T, and the unit of T is seconds.

6. The intelligent control-based roller screen protection method according to claim 4, characterized in that, The specific details of the crawling strategy are as follows: Let the time period for the first capture be T1, the time period for the second capture be T2, the time period for the third capture be T3, the time period for the fourth capture be T4, and so on until the time period for the Nth capture is T. N The time interval between T1 and T2 is t / 2, the time interval between T2 and T3 is t, and the time interval between T3 and T4 is t / 2. The intervals t / 2 and t are cyclically set until T... N .

7. The intelligent control-based roller screen protection method according to claim 3, characterized in that, The specific content of step 3 is as follows: Step 3.1: Install a vehicle sensor and an automatically lifting barrier at the entrance of the receiving pit; Step 3.2: When the vehicle sensor detects that a loading vehicle is approaching, the control system controls the barrier gate to rise and open, and at the same time sends a delayed start signal to the roller screen, so that the roller screen starts after a delay. Step 3.3: Then the loading vehicle begins unloading, and the material is screened using a roller screen; Step 3.4: After the loading vehicle finishes unloading, the control system controls the gate to lower and close after the vehicle leaves, based on the vehicle sensor's detection of the vehicle's departure. At the same time, the control system determines whether the roller screen is in an unloaded state based on the current sensor's collection of current changes. If it is in an unloaded state, the control system controls the roller screen to stop running.

8. The intelligent control-based roller screen protection method according to claim 3, characterized in that, The specific content of step 5 is as follows: Step 5.1: During the screening process of the roller screen, the control system analyzes and processes the current data of the current sensor. If the load of the roller screen continues to increase, the control system controls the drive device to reduce the speed of the screen shaft motor in order to increase the shearing force. Step 5.2: During the screening process of the roller screen, when the vision inspection device detects the accumulation of material on the screen surface, the control system controls the drive device to reduce the speed of the screen shaft motor in order to increase the shearing force. Step 5.3: If the roller screen load continues to increase or material accumulates on the screen surface after the screen shaft motor has reduced its speed for a period of time, the control system will control the drive device to briefly reverse the screen shaft motor to discharge the material.

9. The intelligent control-based roller screen protection method according to claim 3, characterized in that, The specific content of step 6 is as follows: Step 6.1: Combine the changes in current data from the current sensor and analyze and process them through the control system; Step 6.2: The control system exchanges data with the factory's manufacturing execution system via a communication protocol; Step 6.3: The factory manufacturing execution system adjusts the feeding amount of the upstream feeder in conjunction with the system.

10. A roller screen protection system based on intelligent control, which implements the roller screen protection method based on intelligent control as described in any one of claims 1 to 9, characterized in that, The system specifically includes the following: A data acquisition module is used to acquire multimodal data of the roller screen. The data acquisition module includes a temperature sensor, a vibration sensor, a current sensor, and a vision inspection device. The control system is used to analyze and process the multimodal data of the roller screen collected by the data acquisition module and issue control commands. A drive unit, which is controlled by a control system to adjust the speed and direction of the screen shaft motor; The communication module enables data interaction between the control system, the factory manufacturing execution system, and the cloud platform based on a communication protocol. The barrier gate and vehicle sensing device are controlled by a control system to achieve automatic raising and lowering of the barrier gate; A human-computer interaction display screen is used to interact with the control system.

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