Material roll mill system and method

Abstract

The application provides a material roller mill system and method, and relates to the technical field of roller mill process. In the system, the screening device is in communication with the feeding bin. Thus, the feeding bin is used for receiving new feeding material from the storage buffer bin and material particles with a size greater than a set size threshold from the screening device, and outputting the mixed material to the roller mill. The roller mill is used for extruding the mixed material from the feeding bin to obtain material particles. The screening device is used for screening the material particles, so that the material particles with a size less than or equal to the screen hole enter the next process device, and the material particles with a size greater than the screen hole return to the feeding bin. In this way, the mixing of the new feeding material of the roller mill and the material particles of the screening device can improve the stability and processing efficiency of the roller mill. Moreover, additional return material bin, feeder and other devices are not required, the process flow is simple, and the device cost and maintenance cost are saved.

Description

Technical Field

[0001] This application relates to the field of roller milling technology, and in particular to a material roller milling system and method. Background Technology

[0002] Material roller mill system is a widely used system for ore crushing and fine grinding. It can crush materials by squeezing under high pressure.

[0003] In traditional closed-loop processes, the oversize return material from the screening equipment of the material roller mill system and the new material fed into the storage buffer silo usually need to be processed through different roller mill branches (with separate return material silos, feeders, conveyor belts, etc.). This results in a complex process flow, redundant equipment configuration, and increased equipment investment and maintenance costs. Furthermore, the mixing degree between the new material and the oversize return material arriving at the roller mill of the material roller mill system is poor. Due to the different sizes of the new material and the oversize return material, the roller mill suffers from poor stability and low processing efficiency. Summary of the Invention

[0004] This application provides a material roller mill system and method to solve the problems of complex process flow, redundant equipment configuration, poor stability of roller mills, and low processing efficiency in the prior art.

[0005] In a first aspect, this application provides a material roller mill system, which includes a storage buffer silo, a feed silo, a roller mill, and a screening device. The storage buffer silo, feed silo, roller mill, and screening device are connected in sequence, and the screening device is also connected to the feed silo. The feed hopper is used to receive new feed material from the storage buffer hopper and material particles larger than the set size threshold from the screening equipment, and outputs the mixture to the roller mill; Roller mills are used to extrude a mixture from a feed hopper to obtain material particles; Screening equipment is used to screen material particles, allowing particles with a size smaller than or equal to the screen opening to enter the next process equipment, and particles with a size larger than the screen opening to return to the feed hopper.

[0006] In some embodiments, the material roller mill system further includes a mixing device, a screening device, a mixing device and a feed hopper connected in sequence, and a storage buffer hopper, a mixing device and a feed hopper connected in sequence. The mixing device is used to receive material particles larger than the sieve holes from the screening device and new material from the storage buffer hopper and mix them evenly, and output the evenly mixed material to the feed hopper.

[0007] In some embodiments, the material roller mill system further includes a main controller, a first electrically controlled conveyor belt between the storage buffer silo and the feed silo, and a second electrically controlled drive belt between the screening equipment and the feed silo. The first electrically controlled conveyor belt is used to collect the initial flow rate of the newly fed material being conveyed. The second electrically controlled conveyor belt is used to collect the second flow rate of material particles larger than the sieve aperture that are being conveyed; The main controller is used to determine whether the actual ratio of the first flow rate to the second flow rate reaches the preset ratio; if the actual ratio is less than the preset ratio, the operating frequency of the first electrically controlled conveyor belt is increased or the operating frequency of the second electrically controlled conveyor belt is decreased; if the actual ratio is greater than the preset ratio, the operating frequency of the first electrically controlled conveyor belt is decreased or the operating frequency of the second electrically controlled conveyor belt is increased.

[0008] In some embodiments, the material roller mill system also includes a main controller, a feed pneumatic valve at the feed inlet of the feed hopper, and a flow regulating plate at the discharge outlet of the feed hopper. The main controller is used to control the flow regulating plate to open to a first unit opening degree every preset time interval when the feed pneumatic valve is detected to be open and the flow regulating plate has not reached the preset ratio of the target opening degree; and to control the flow regulating plate to open to a second unit opening degree every preset time interval when the flow regulating plate has reached the preset ratio of the target opening degree, until the flow regulating plate reaches the target opening degree, wherein the second unit opening degree is less than the first unit opening degree.

[0009] In some implementations, the material roller mill system also includes a level sensor installed in the feed hopper, and the main controller is also used to receive the material level in the feed hopper collected by the level sensor, and increase the target opening degree when the material level in the feed hopper is greater than a set threshold.

[0010] In some embodiments, the roller mill includes a fixed roller and a moving roller arranged opposite each other, a fixed roller motor for driving the fixed roller to rotate, a moving roller motor for driving the moving roller to rotate, and a hydraulic system for driving the fixed roller and the moving roller to press against each other. The main controller is also used to control the flow regulating plate to reduce its opening when an alarm signal is detected from the roller mill when the alarm conditions are met. The alarm condition is at least one of the following: The operating current of the fixed roller motor or the moving roller motor is greater than the set current threshold. The difference between the operating current of the fixed roller motor and the operating current of the moving roller motor is greater than the set difference threshold. The gap between the stationary roller and the moving roller is greater than the set gap threshold. The hydraulic pressure in the hydraulic system is greater than the set pressure threshold.

[0011] In some embodiments, the material roller mill system further includes a main controller, and the discharge port of the storage buffer silo is equipped with multiple lightweight plate discharge machines. A first electrically controlled conveyor belt connected to the lightweight plate discharge machines is provided between the storage buffer silo and the feeding silo. The first electrically controlled conveyor belt is used to collect the initial flow rate of the newly fed material being conveyed. The main controller is used to determine the adjustment frequency based on the flow difference between the first flow rate and the target flow rate, and to determine the unit adjustment frequency of each light plate ejector based on the adjustment frequency and the number of light plate ejectors, and to adjust the working frequency of each light plate ejector based on the unit adjustment frequency.

[0012] In some implementations, the main controller is also used to sequentially control multiple light plate discharge machines to stop working if the first flow rate is lower than the set material flow rate lower limit. When controlling any light plate discharge machine to stop working, if the first flow rate does not decrease, a prompt message indicating that the currently stopped light plate discharge machine has malfunctioned is output.

[0013] In some embodiments, the material roller mill system includes multiple screening devices, each of which is connected to a second electrically controlled drive belt between itself and the feed hopper. The main controller is also used to determine the material processing flow rate of each screening device based on the flow rate of the mixed material output from the feed hopper and the number of screening devices. If the material processing flow rate of the screening device is lower than the set flow rate threshold, the operating frequency of each second electrically controlled drive belt is increased.

[0014] Secondly, this application also provides a material roller milling method, applied to the material roller milling system provided in the first aspect of this application. The method provided by this application includes... The feed hopper receives new feed material from the storage buffer hopper and material particles with a size less than or equal to a set size threshold from the screening equipment, and outputs the mixture to the roller mill. The roller mill compresses the mixture from the feed hopper to obtain material particles; Screening equipment filters material particles, allowing particles smaller than or equal to the screen openings to enter the next process, while particles larger than the screen openings are returned to the feed hopper.

[0015] This application provides a material roller mill system and method, in which a screening device is also connected to a feed hopper. The feed hopper receives new material from a storage buffer hopper and material particles larger than a set size threshold from the screening device, and outputs a mixture to the roller mill. The roller mill compresses the mixture from the feed hopper to obtain material particles. The screening device screens the material particles, allowing particles smaller than or equal to the screen openings to enter the next process, and returning particles larger than the screen openings to the feed hopper. This allows for mixing of the new material to the roller mill and the material particles from the screening device, improving the stability and processing efficiency of the roller mill. Furthermore, it eliminates the need for additional return hoppers, feeders, and other equipment, simplifying the process and saving on equipment and maintenance costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the architecture of the material roller mill system provided in the embodiments of this application; Figure 2 A flowchart of a material roller milling method provided in an embodiment of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of the embodiments of this application.

[0019] The technical solutions of this application and how they solve the aforementioned technical problems will be described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0020] Please see Figure 1 This application provides a material roller mill system, which includes a storage buffer bin 101, a feeding bin 102, a roller mill 103 (such as a high-pressure roller mill), and a screening device 104 (such as a micro powder sieve). The storage buffer bin 101, the feeding bin 102, the roller mill 103, and the screening device 104 are connected in sequence, and the screening device 104 is also connected to the feeding bin 102.

[0021] The feed hopper 102 is used to receive new feed material from the storage buffer hopper 101 and material particles larger than a set size threshold from the screening equipment 104, and outputs the mixture to the roller mill 103; the roller mill 103 is used to extrude the mixture from the feed hopper 102 to obtain material particles; the screening equipment 104 is used to screen the material particles, so that material particles with a size smaller than or equal to the screen aperture enter the next process equipment (such as magnetic separation equipment, which uses magnetic force to separate magnetic minerals from non-magnetic minerals (gangue) and select iron minerals as raw materials for steelmaking), and material particles with a size larger than the screen aperture are returned to the feed hopper 102.

[0022] The material roller mill system provided in this application embodiment can connect the screening device 104 to the feeding bin 102. The feeding bin 102 receives new material from the storage buffer bin 101 and material particles larger than a set size threshold screened by the screening device 104, and outputs the mixture to the roller mill 103. The roller mill 103 compresses the mixture from the feeding bin 102 to obtain material particles. The screening device 104 screens the material particles, allowing particles smaller than or equal to the screen openings to enter the next process, and returning particles larger than the screen openings to the feeding bin 102. This allows for mixing of the new material fed to the roller mill 103 and the material particles from the screening device 104, improving the stability and processing efficiency of the roller mill 103. Furthermore, it eliminates the need for additional return hoppers, feeders, and other equipment, simplifying the process and saving on equipment and maintenance costs.

[0023] In addition, the material roller mill system also includes a mixing device, a screening device 104, a mixing device, and a feed hopper 102 connected in sequence, and a storage buffer hopper 101, a mixing device, and a feed hopper 102 connected in sequence. The mixing device receives material particles larger than the sieve openings from the screening device 104 and new material from the storage buffer hopper 101, and mixes them evenly, then outputs the evenly mixed material to the feed hopper 102. In this way, the mixing degree of the new material fed into the roller mill 103 and the material particles from the screening device 104 can be further improved, thereby further improving the stability and processing efficiency of the roller mill 103.

[0024] In addition, the material roller mill system also includes a main controller, a first electrically controlled conveyor belt between the storage buffer bin 101 and the feeding bin 102, and a second electrically controlled transmission belt between the screening device 104 and the feeding bin 102. The first electrically controlled conveyor belt (equipped with a flow sensor) is used to collect the first flow rate of the new material being conveyed; the second electrically controlled conveyor belt (equipped with a flow sensor) is used to collect the second flow rate of the material particles being conveyed that are larger than the screen openings.

[0025] The main controller is used to determine whether the actual ratio of the first flow rate to the second flow rate reaches the preset ratio; if the actual ratio is less than the preset ratio, the operating frequency of the first electrically controlled conveyor belt is increased or the operating frequency of the second electrically controlled conveyor belt is decreased; if the actual ratio is greater than the preset ratio, the operating frequency of the first electrically controlled conveyor belt is decreased or the operating frequency of the second electrically controlled conveyor belt is increased.

[0026] Understandably, the crushing efficiency of the roller mill 103 is highly dependent on the particle size distribution and packing density of the material in the roller gap. If the proportion of material particles from the screening equipment 104 is too low, it will result in too much fine powder and insufficient coarse particles in the mixture. When the rollers press down, a dense "material layer" cannot be formed, and the pressure will be directly transmitted to the roller surface. This will not only result in poor crushing effect and coarse product particle size, but also aggravate roller surface wear. On the other hand, if the proportion of material particles from the screening equipment 104 is too high, it will result in the mixture being full of coarse particles with excessive porosity. The rollers will need to spend a lot of energy to compact the gaps, which will lead to a surge in hydraulic pressure, high current alarm, or even failure to crush the material, creating a vicious cycle. Therefore, by maintaining the proportion of material particles from the screening equipment 104 at a preset ratio (such as 40%~70%), and using the "hard core" of the material particles from the screening equipment 104 that is already covered with microcracks as the crushing medium, a uniform and dense material layer can be formed in the roller gap, so that the extrusion energy can be efficiently transferred to each new ore particle, ultimately achieving the effect of "maximum fine powder yield, lowest power consumption per ton of ore, and most stable equipment operation".

[0027] In addition, the material roller mill system also includes a main controller. The feed inlet of the feed hopper 102 is equipped with a feed pneumatic valve, and the discharge outlet of the feed hopper 102 is equipped with a flow regulating plate. The main controller, upon detecting that the feed pneumatic valve is open, controls the flow regulating plate to open to a first unit opening (e.g., 5%) every preset time interval (e.g., 15 seconds) if the flow regulating plate has not reached the preset proportion of the target opening (e.g., 20%). If the flow regulating plate reaches the preset proportion of the target opening, it controls the flow regulating plate to open to a second unit opening (e.g., 2%) every preset time interval, until the flow regulating plate reaches the target opening, wherein the second unit opening is less than the first unit opening.

[0028] In this way, during the initial stage of opening the flow regulating plate (e.g., 0-20%), a rapid opening in large increments of 5% is used to quickly escape the "dead zone"—because at extremely small openings, materials are prone to bridging or clogging at the outlet. Quickly opening this range effectively prevents arching at the bottom of the silo and ensures smooth material flow. Once the opening exceeds 20%, the material has a stable flow state. At this point, a slow increment of 2% is used to prevent "material shoveling"—if large increments are continued, a large amount of material will instantly flood into the roller mill 103, causing a violent surge in motor current and hydraulic pressure, triggering an alarm or even causing a shutdown. This "fast at first, slow later" variable speed ramp-up strategy avoids the risk of material blockage and provides sufficient buffer time for the downstream roller mill 103, ensuring that the entire system smoothly transitions to normal operating conditions. In addition, the material roller mill system also includes a material level sensor installed in the feed hopper 102. The main controller is also used to receive the material level of the feed hopper 102 collected by the material level sensor, and increase the target opening degree when the material level of the feed hopper 102 is greater than the set threshold (such as 45% of the hopper capacity).

[0029] Understandably, the material level in feed hopper 102 determines the height of the material accumulation at the bottom of the hopper. The higher the material level, the greater the downward pressure exerted by gravity on the material (i.e., "material pressure"). When the material level is greater than 45%, a sufficiently dense and continuous column of material has formed inside the hopper. At this point, increasing the target opening and correspondingly increasing the opening of the regulating plate will cause the material to be "pressed" into a dense, continuous flow by this material pressure, falling evenly and continuously into the roller mill 103. However, if the material level is below 45%, the material inside the hopper is too thin, loose, and contains air. If the target opening is forcibly increased to widen the flow regulating plate, the material will fall in a thin, intermittent "jet" state due to insufficient weight. This can cause material layer oscillation and current fluctuations in the roller mill 103, or even damage to the roller surface due to direct collision with the rollers caused by material interruption. Therefore, when the material level in feed hopper 102 is greater than the set threshold (e.g., 45% of the hopper capacity), increasing the target opening ensures equipment safety, stable operation, and high efficiency.

[0030] Furthermore, the main controller is also used to control the flow regulating plate to close to a preset lower limit opening after a preset time (e.g., 20 seconds) when the feed pneumatic valve is detected to be closed. This prevents material from accumulating on top of the flow regulating plate during shutdown, clearing the channel for smooth restart.

[0031] Additionally, the roller mill 103 includes a fixed roller and a moving roller arranged opposite each other, a fixed roller motor for driving the fixed roller to rotate, a moving roller motor for driving the moving roller to rotate, and a hydraulic system for driving the fixed roller and the moving roller to press against each other. The main controller is also used to control the flow regulating plate to reduce its opening when an alarm signal is detected from the roller mill 103 when the alarm conditions are met. In this way, the roller mill 103 can have a buffer space to recover itself when it encounters an overload, thus avoiding equipment damage or shutdown.

[0032] For example, the alarm conditions described above are at least one of the following: The operating current of the fixed roller motor or the moving roller motor is greater than the set current threshold. The difference between the operating current of the fixed roller motor and the operating current of the moving roller motor is greater than the set difference threshold. The gap between the stationary roller and the moving roller is greater than the set gap threshold. The hydraulic pressure in the hydraulic system is greater than the set pressure threshold.

[0033] Furthermore, the main controller is also used to increase the flow regulating plate opening by 1% when the gap between the fixed roller and the moving roller is less than 37mm (original gap is 35mm); and to decrease the flow regulating plate opening by 1% when the gap between the fixed roller and the moving roller is greater than 70mm (original gap is 35mm). In the event of a fault shutdown of the roller mill 103, the flow regulating plate opening is maintained at its pre-shutdown position until the two fixed roller motors and the moving roller motor of the roller mill 103 start again, at which point the flow regulating plate opening is reduced to 5%. In addition, the material roller mill system also includes a main controller. The discharge port of the storage buffer silo 101 is equipped with multiple lightweight plate discharge machines. A first electrically controlled conveyor belt connected to the lightweight plate discharge machines is installed between the storage buffer silo 101 and the feeding silo 102. The first electrically controlled conveyor belt is used to collect the initial flow rate of the newly fed material. The main controller is used to determine the adjustment frequency based on the flow difference between the initial flow rate and the target flow rate. Based on the adjustment frequency and the number of lightweight plate discharge machines, it determines the unit adjustment frequency of each lightweight plate discharge machine and adjusts the operating frequency of each lightweight plate discharge machine according to the unit adjustment frequency.

[0034] Specifically, when the initial flow rate is less than the target flow rate, the operating frequency of each lightweight plate discharge machine is increased according to the unit adjustment frequency. The target flow rate is 2400 tons, and the actual initial flow rate is 2250 tons, resulting in a flow rate difference of 150 tons. With the adjustment frequency set at 3 Hz, the unit adjustment frequency of each lightweight plate discharge machine is increased by 1 Hz. Similarly, when the initial flow rate is greater than the target flow rate, the operating frequency of each lightweight plate discharge machine is decreased according to the unit adjustment frequency.

[0035] In addition, the main controller is also used to indicate that one of the light plate feeders has a problem if the first flow rate is lower than the set material flow rate lower limit. Then, it controls multiple light plate feeders to stop working in sequence. When controlling any light plate feeder to stop working, if the first flow rate does not decrease, it outputs a prompt message that the currently stopped light plate feeder has a fault. This realizes automated troubleshooting of faulty light plate feeders and saves labor costs.

[0036] In addition, the material roller mill system includes multiple screening devices 104. Each screening device 104 is connected to a second electrically controlled drive belt between itself and the feed hopper 102. The main controller is also used to determine the material processing flow rate of each screening device 104 based on the flow rate of the mixture output from the feed hopper 102 and the number of screening devices 104. If the material processing flow rate of the screening device 104 is lower than the set flow rate threshold, the operating frequency of each second electrically controlled drive belt is increased (e.g., by 0.5 Hz). In this way, it is ensured that each operating screening device 104 can increase its output synchronously and avoid uneven loading, while using a sufficiently small step size to prevent instantaneous overload, ensuring that the screening efficiency is always online.

[0037] In addition, such as Figure 2 As shown, this application also provides a material roller milling method, applied to the material roller milling system provided in the above embodiments of this application. It should be noted that the material roller milling method provided in this application has the same basic principle and technical effects as the above embodiments. For the sake of brevity, any parts not mentioned in the embodiments of this application can be referred to the corresponding content in the above embodiments. The method provided in this application includes: S201: The feed hopper 102 receives new feed material from the storage buffer hopper 101 and material particles with a size less than or equal to a set size threshold from the screening equipment 104, and outputs the mixture to the roller mill 103.

[0038] S202: The roller mill 103 extrudes the mixture from the feed bin 102 to obtain material particles.

[0039] S203: The screening equipment 104 screens the material particles so that the material particles with a size smaller than or equal to the screen aperture enter the next process equipment, and the material particles with a size larger than the screen aperture return to the feed hopper 102.

[0040] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0041] In summary, the above descriptions are merely preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A material roller mill system, characterized in that, The material roller mill system includes a storage buffer silo, a feed silo, a roller mill, and a screening device. The storage buffer silo, the feed silo, the roller mill, and the screening device are connected in sequence, and the screening device is also connected to the feed silo. The feed hopper is used to receive new feed material from the storage buffer hopper and material particles larger than a set size threshold screened by the screening equipment, and outputs a mixture to the roller mill. The roller mill is used to extrude the mixture from the feed hopper to obtain material particles; The screening equipment is used to screen the material particles, so that material particles with a size smaller than or equal to the screen aperture enter the next process equipment, and material particles with a size larger than the screen aperture return to the feed hopper.

2. The system according to claim 1, characterized in that, The material roller mill system also includes a mixing device. The screening device, the mixing device, and the feed hopper are connected in sequence. The storage buffer hopper, the mixing device, and the feed hopper are also connected in sequence. The mixing device is used to receive material particles larger than the sieve holes from the screening device and new material from the storage buffer hopper and mix them evenly. The evenly mixed material is then output to the feed hopper.

3. The system according to claim 1, characterized in that, The material roller mill system also includes a main controller, a first electrically controlled conveyor belt is provided between the storage buffer silo and the feeding silo, and a second electrically controlled drive belt is provided between the screening equipment and the feeding silo. The first electrically controlled conveyor belt is used to collect the initial flow rate of the newly fed material being conveyed; The second electrically controlled conveyor belt is used to collect the second flow rate of material particles that are being conveyed and whose size is larger than the sieve aperture; The main controller is used to determine whether the actual ratio of the first flow to the second flow reaches a preset ratio. If the actual ratio is less than the preset ratio, the operating frequency of the first electrically controlled conveyor belt is increased, or the operating frequency of the second electrically controlled conveyor belt is decreased; if the actual ratio is greater than the preset ratio, the operating frequency of the first electrically controlled conveyor belt is decreased, or the operating frequency of the second electrically controlled conveyor belt is increased.

4. The system according to claim 1, characterized in that, The material roller mill system also includes a main controller, the feed inlet of the feed hopper is equipped with a feed pneumatic valve, and the discharge outlet of the feed hopper is equipped with a flow regulating plate. The main controller is used to control the flow regulating plate to open to a first unit opening degree every preset time interval when the feed pneumatic valve is detected to be open and the flow regulating plate has not reached the preset ratio of the target opening degree. When the flow regulating plate reaches the target opening degree by a preset ratio, the flow regulating plate is controlled to open to a second unit opening degree every preset time interval until the flow regulating plate reaches the target opening degree, wherein the second unit opening degree is less than the first unit opening degree.

5. The system according to claim 4, characterized in that, The material roller mill system also includes a material level sensor installed in the feed hopper. The main controller is also used to receive the material level of the feed hopper collected by the material level sensor, and to increase the target opening degree when the material level of the feed hopper is greater than a set threshold.

6. The system according to claim 4, characterized in that, The roller mill includes a fixed roller and a moving roller arranged opposite each other, a fixed roller motor for driving the fixed roller to rotate, a moving roller motor for driving the moving roller to rotate, and a hydraulic system for driving the fixed roller and the moving roller to press against each other. The main controller is also used to control the flow regulating plate to reduce its opening degree when an alarm signal is detected from the roller mill when the alarm conditions are met. The alarm condition is at least one of the following: The operating current of the fixed roller motor or the moving roller motor is greater than the set current threshold. The difference between the operating current of the fixed roller motor and the operating current of the moving roller motor is greater than a set difference threshold. The gap between the fixed roller and the moving roller is greater than a set gap threshold. The hydraulic pressure of the hydraulic system is greater than the set pressure threshold.

7. The system according to claim 1, characterized in that, The material roller mill system also includes a main controller. The discharge port of the storage buffer silo is equipped with multiple lightweight plate discharge machines. A first electrically controlled conveyor belt connected to the lightweight plate discharge machines is installed between the storage buffer silo and the feeding silo. The first electrically controlled conveyor belt is used to collect the initial flow rate of the newly fed material being conveyed; The main controller is used to determine the adjustment frequency based on the flow difference between the first flow rate and the target flow rate, determine the unit adjustment frequency of each light plate ejector based on the adjustment frequency and the number of light plate ejectors, and adjust the working frequency of each light plate ejector based on the unit adjustment frequency.

8. The system according to claim 7, characterized in that, The main controller is also used to sequentially control multiple light plate discharge machines to stop working if the first flow rate is lower than the set material flow rate lower limit. When controlling any light plate discharge machine to stop working, if the first flow rate does not decrease, the controller outputs a prompt message indicating that the currently stopped light plate discharge machine has malfunctioned.

9. The system according to any one of claims 1-8, characterized in that, The material roller mill system also includes a main controller. The material roller mill system includes multiple screening devices. Each screening device is connected to a second electrically controlled drive belt between itself and the feed hopper. The main controller is also used to determine the material processing flow rate of each screening device based on the flow rate of the mixed material output from the feed hopper and the number of screening devices. If the material processing flow rate of the screening device is lower than a set flow rate threshold, the operating frequency of each second electrically controlled drive belt is increased.

10. A method for roller milling materials, characterized in that, Applied to the material roller mill system according to any one of claims 1-9, the method includes The feed hopper receives new feed material from the storage buffer hopper and material particles with a size less than or equal to the set size threshold screened by the screening equipment, and outputs a mixture to the roller mill. The roller mill extrudes the mixture from the feed hopper to obtain material particles; The screening equipment screens the material particles, so that material particles with a size smaller than or equal to the screen aperture enter the next process equipment, and material particles with a size larger than the screen aperture return to the feed hopper.

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