Three-area force field cooperative control method and system for composite force field grinding equipment

Abstract

The invention discloses a three-area force field cooperative control method and system for composite force field grinding equipment, and belongs to the technical field of grinding equipment process control, and the three-area force field cooperative control method comprises the following steps: S1, dynamically adjusting operation parameters of a vortex shearing area by taking a discharging particle size median value of a pre-crushing area as a first linkage hub; s2, the cyclic load rate of the vortex shearing area serves as a second linkage hub, and the crushing strength of the pre-crushing area and the grinding strength of the fine grinding area are cooperatively adjusted; and S3, taking the target granularity index of the product as a global optimization target, preferentially adjusting the operation parameters of the fine grinding and stripping area according to the deviation between the granularity index and a target value, if the operation parameters still do not reach the standard after adjustment, reversely tracing and adjusting the operation parameters of the vortex shearing area in a linkage manner, and finally realizing granularity optimization by changing the characteristics of particles input into the fine grinding and stripping area. According to the invention, accurate matching and dynamic balance of each force field intensity can be realized, and the equipment is ensured to be in a high-efficiency, low-consumption and high-quality working state continuously.

Description

Technical Field

[0001] This invention belongs to the field of process control technology for grinding equipment, and specifically relates to a three-zone force field coordinated control method and system for composite force field grinding equipment. Background Technology

[0002] High-hardness materials (such as quartzite, sandstone, and tailings) have long faced technical bottlenecks in grinding processes in industries like cement and non-metallic minerals due to their high Mohs hardness and strong abrasiveness, including enormous energy consumption, severe equipment wear, and poor product performance. Currently, the mainstream industrial mills, such as vertical roller mills and roller presses, rely on a "high-pressure bed extrusion" mechanism. While effective for medium- to low-hardness materials, their inherent flaws become apparent when processing high-hardness materials: power consumption per unit product surges, wear-resistant parts lifespan is drastically shortened, and the produced particles are often flaky or angular, negatively impacting subsequent processing performance.

[0003] In order to seek a fundamental breakthrough at the level of pulverization principle, those skilled in the art have theoretically proposed a technology for grinding using a "composite force field". This concept aims to get rid of the limitations of single pressure pulverization, and to conduct specialized grinding design for the brittleness and high abrasiveness of high-hardness materials by sequentially integrating multiple mechanical actions (such as impact, shearing and abrasion), in order to simultaneously achieve the comprehensive goals of energy saving, consumption reduction and optimization of product particle morphology.

[0004] However, transforming this advanced "composite force field" theory into stable, efficient, and controllable industrial equipment faces a key and unresolved challenge—the multi-zone coordinated control problem. This problem manifests itself in the following ways:

[0005] First, in an ideal composite force field equipment, the functional zones are closely connected and mutually influential in terms of material and energy flow. The discharge characteristics of the preceding zone are the process input for the subsequent zone, directly determining its operating status and efficiency; conversely, the operating status of the subsequent zone will, in turn, affect the preceding zone through system circulation and other means. This inherent strong coupling requires coordinated adjustment of the operating parameters of each zone. However, the control strategies of existing grinding equipment are all based on equipment with a single or dominant force field, forming relatively isolated control loops. They lack control models and strategies to handle the complex coupling relationships between multiple zones and multiple force fields. Simply transplanting existing control methods will lead to each functional zone operating independently, failing to form a synergistic and efficient whole, and may even cause system instability and increased energy consumption due to parameter conflicts.

[0006] Secondly, the objectives of composite force field equipment are multifaceted, including low energy consumption, low wear, high output, and excellent product fineness and morphology. These objectives may be mutually restrictive. For example, increasing the crushing in the front zone to improve output may lead to excessive grinding load in the rear zone; strengthening grinding to optimize morphology may increase energy consumption. Existing control strategies are usually designed around a single primary objective, lacking effective means to coordinately optimize multiple operating variables under multi-objective constraints.

[0007] In conclusion, on the road from theoretical conception to industrial application of "composite force field" grinding, in addition to the innovation of mechanical structure, developing a set of dedicated control methods that are deeply matched with it and can realize intelligent coordination and dynamic optimization of multi-zone force fields has become the key prerequisite for unlocking its full technical potential and ensuring its industrial practicality, as well as a technical gap that urgently needs to be overcome. Summary of the Invention

[0008] The purpose of this invention is to provide a three-zone force field coordinated control method and system for composite force field grinding equipment. Addressing the problem that existing composite force field grinding equipment lacks an effective coordinated control strategy, this invention establishes a three-zone parameter linkage mechanism with key intermediate state variables as a bridge to achieve precise matching and dynamic balance of the intensity of each force field, ensuring that the equipment is continuously in a high-efficiency, low-consumption, and high-quality working state.

[0009] To achieve the aforementioned objectives, the first objective of this invention is a three-zone force field coordinated control method for composite force field grinding equipment. Following the material processing sequence, the three zones include a pre-crushing zone, a vortex shearing zone, and a fine grinding zone. The coordinated control method includes: S1. Using the median discharge particle size of the pre-crushing zone as the first linkage hub, the operating parameters of the vortex shear zone are dynamically adjusted according to the median discharge particle size. S2. Using the cyclic load rate of the vortex shear zone as the second linkage hub, the crushing intensity of the pre-crushing zone and the grinding intensity of the fine grinding zone are adjusted in a coordinated manner according to the cyclic load rate. S3. Using the product target particle size index as the global optimization target, the operation parameters of the fine grinding zone are adjusted first based on the deviation between the particle size index and the target value. If the target is still not met after adjustment, the operation parameters of the vortex shear zone are adjusted in reverse and linked. By changing the particle characteristics of the input fine grinding zone, particle size optimization is finally achieved.

[0010] Preferably, in S1, the median discharge particle size is obtained using a median discharge particle size estimation model; wherein, the mathematical expression of the median discharge particle size estimation model is: ; In the formula: D 50 This is the median particle size of the output from the pre-crushing zone, in μm; D inThis is the median feed particle size in the pre-crushing zone, in μm; k p n1 is the pre-crushing efficiency calibration coefficient, with a value range of 0.8 to 2.5; n1 is the actual rotational speed in the pre-crushing zone, in r / min; n 10 δ is the rated speed of the pre-crushing zone, in r / min; δ is the actual crushing gap of the pre-crushing zone, in mm; δ0 is the rated crushing gap of the pre-crushing zone, in mm; ε p It is a correction item.

[0011] Preferably, in S1, the operating parameters for dynamically adjusting the vortex shear zone include: according to D 50 The deviation from the set value is used to adjust the grinding disc speed in a reverse correlation: ; In the formula: n2 is the target rotational speed of the grinding disc in the vortex shear zone, in r / min; n 20 It is the basic rotational speed of the grinding disc in the vortex shear zone, and the unit is r / min; This is the speed regulation correlation coefficient, with a value range of 0.1 to 0.9; D set The discharge particle size D of the pre-crushing zone 50 The set value is in μm.

[0012] Preferably, in S2, the cyclic load rate of the vortex shear zone is estimated using a load rate calculation model; wherein, the mathematical expression of the load rate calculation model is: ; In the formula: L c It is the cyclic load factor, dimensionless; Q r Q is the material return rate in the vortex shear zone, measured in t / h; p Q is the finished product output rate of the vortex shear zone, in t / h; in2 Q is the feed rate in the vortex shear zone, measured in t / h; out2 It is the total output of the vortex shear zone, in t / h.

[0013] Preferably, in S2, adjusting the crushing intensity of the pre-crushing zone according to the cyclic load rate includes: Crushing strength is characterized by "specific impact energy," which is achieved by increasing the rotational speed in the pre-crushing zone. ; When L c >L c_high At the same time, adjust the rotation speed of the pre-crushing zone: ; In the formula: E p It is the specific impact energy of the pre-fractured zone, measured in kJ / kg; k eα is the energy transfer coefficient, determined experimentally; α is the crushing strength adjustment coefficient, ranging from 0.05 to 0.55; L c_high It is the upper limit threshold of the cyclic load rate; when L c >L c_high When α is negative, it takes a negative value.

[0014] Preferably, in S2, adjusting the grinding intensity of the fine grinding zone based on the real-time value of the cycle load rate includes: Grinding intensity is characterized by both "specific surface area of ​​the medium" and "rotation speed," and can be achieved by increasing the stirring speed or the medium filling rate. ; When L c >L c_high At the same time, adjust the rotation speed of the fine grinding zone: ; In the formula: E g It is the specific grinding energy of the fine abrasion zone, measured in kJ / kg; k g This is the grinding efficiency coefficient, determined experimentally; φ is the media filling rate; n3 is the stirring speed in the fine grinding zone, in r / min; n 30 β is the basic rotational speed in the fine grinding zone, measured in r / min; β is the grinding intensity adjustment coefficient, ranging from 0.1 to 0.95; when L c >L c_high When β is negative, it takes a negative value.

[0015] Preferably, in S3, the operating parameters of the fine abrasion zone are adjusted preferentially, including: When |S S set |>ΔS allow At the same time, prioritize adjusting the media filling rate in the fine abrasion zone: ; In the formula: φ0 is the basic value of the medium filling rate; k φ This is the fill rate adjustment coefficient, with a value range of -0.5 to -1.0; ΔS allow This is the allowable deviation of the particle size index.

[0016] Preferably, in S3, the operating parameters of the vortex shear zone are adjusted in reverse and in conjunction with the backtracking process, including: If adjusting φ still does not meet the standard, then adjust the grinding gap δ2 in the vortex shear zone: ; In the formula: δ2 is the grinding gap in the vortex shear zone, in mm; δ 20 This is the basic value of the grinding gap, in mm; k δ It is the gap adjustment coefficient, with a value range of 0.02 to 0.90.

[0017] The second objective of this invention is to provide a three-zone force field coordinated control system for composite force field grinding equipment. Following the material processing sequence, the three zones include a pre-crushing zone, a vortex shearing zone, and a fine grinding zone. The coordinated control system includes: The dynamic adjustment module uses the median discharge particle size of the pre-crushing zone as the first linkage hub, and dynamically adjusts the operating parameters of the vortex shear zone according to the median discharge particle size. The coordinated adjustment module uses the cyclic load rate of the vortex shear zone as the second linkage hub, and adjusts the crushing intensity of the pre-crushing zone and the grinding intensity of the fine grinding zone in a coordinated manner according to the cyclic load rate. The global optimization module uses the product target particle size index as the global optimization target. Based on the deviation between the particle size index and the target value, it prioritizes adjusting the operating parameters of the fine grinding zone. If the target is still not met after adjustment, it traces back and adjusts the operating parameters of the vortex shear zone in conjunction with the target. By changing the particle characteristics of the fine grinding zone, particle size optimization is finally achieved.

[0018] A third objective of this invention is to provide a computer program product comprising a computer program that is executed by a processor of the above-described three-zone force field coordinated control method for composite force field grinding equipment.

[0019] A fourth objective of this invention is to provide a computer-readable storage medium including instructions that, when executed on a computer, cause the computer to perform the aforementioned three-zone force field coordinated control method for composite force field grinding equipment.

[0020] Compared with the prior art, the present invention has the following technical effects: This invention utilizes a linkage mechanism to automatically adapt to fluctuations in feed and dynamically balance the workload of the three zones. For example, when the raw material hardens, causing the pre-crushed product to coarsen, the system automatically strengthens the main grinding zone to cope with this. When pursuing a better product morphology, the system can coordinately adjust the force field in the front zone to create optimal feeding conditions for the rear zone. This allows the equipment to always automatically find and maintain a coordinated working point with the highest overall energy efficiency, minimal wear, and optimal product quality.

[0021] This invention establishes control logic based on explicit physical relationships, rather than relying on complex black-box intelligent algorithms. The technical solution is clear, traceable, easy to understand, and easy to implement. It solves the unique "multi-zone coupling" control problem of composite force field equipment, and has outstanding substantive characteristics. Compared with simple equipment structure improvements or the application of general control methods, it is more novel and creative, and its patent licensing prospects are clear.

[0022] This invention significantly reduces operational complexity, eliminating the need for operators to be proficient in the complex interactions between the three zones. Operators simply need to set the final product target, and the system automatically achieves three-zone coordination. Simultaneously, by maintaining balance in each zone, it avoids localized overload or idling of the equipment, improving operational stability and reliability.

[0023] This invention ensures that the three force fields are always in optimal matching, thereby guaranteeing the full release of the energy-saving potential of equipment design and the potential for product optimization from a control perspective. This transforms the theoretical advantages of the "composite force field" into stable and replicable industrial performance. Grinding energy consumption is significantly reduced, resulting in direct economic benefits. Attached Figure Description

[0024] Figure 1 The flowchart provided is for a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of a preferred embodiment of the present invention; Figure 3 This is a control logic block diagram of the first linkage hub provided in a preferred embodiment of the present invention; Figure 4 The control logic block diagram of the second linkage hub provided in the preferred embodiment of the present invention is shown. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only a part of the embodiments of the present invention, and not all of them. Generally, the embodiments of the present invention described and shown in the accompanying drawings are characteristic technologies and solutions. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] For the first embodiment, please refer to... Figure 1 A three-zone force field coordinated control method for composite force field grinding equipment, wherein the three zones, along the material processing sequence, include a pre-crushing zone, a vortex shearing zone, and a fine grinding zone; the coordinated control method includes: S1. Using the median discharge particle size of the pre-crushing zone as the first linkage hub, the operating parameters of the vortex shear zone are dynamically adjusted according to the median discharge particle size. S2. Using the cyclic load rate of the vortex shear zone as the second linkage hub, the crushing intensity of the pre-crushing zone and the grinding intensity of the fine grinding zone are adjusted in a coordinated manner according to the cyclic load rate. S3. Using the product particle size index as the global optimization target, the operating parameters of the fine grinding zone are adjusted first based on the deviation between the particle size index and the target value. If the target is still not met after adjustment, the operating parameters of the vortex shear zone are adjusted in reverse and linked. By changing the particle characteristics of the fine grinding zone, particle size optimization is finally achieved.

[0027] To better understand the technical solution of the present invention, the following non-limiting description is provided: The core of this invention lies in establishing and implementing a three-zone force field coupling method, and then defining the following cooperative control logic: First, the median particle size D of the discharge from the pre-crushing zone. 50 As the primary linkage hub, it monitors in real time or estimates the median discharge particle size D of the pre-crushing zone using a median discharge particle size estimation model. 50 According to D 50 The operating parameters of the vortex shear zone are dynamically adjusted to match its inlet load with the grinding characteristics; the adjustment includes at least a reverse correlation adjustment of the set value of the grinding disc speed in the vortex shear zone, i.e., D. 50 When increasing the size, appropriately increase the grinding disc speed to handle coarser feed material. 50 When reducing the particle size, appropriately lower the grinding disc speed to save energy and reduce wear. Specifically, when the median output particle size increases, increase the grinding disc speed setting in the vortex shearing zone; when the median output particle size decreases, decrease the grinding disc speed setting in the vortex shearing zone.

[0028] Please see Figures 2 to 4 In S1, the median discharge particle size of the pre-crushing zone is related to the equipment speed, feed particle size, and crushing gap, and is fitted and adjusted using a coarse crushing mechanism equation model. The median discharge particle size is obtained using a median discharge particle size estimation model. The mathematical expression for the median discharge particle size estimation model is: ; In the formula: D 50 This is the median particle size of the output from the pre-crushing zone, in μm; D in This is the median feed particle size in the pre-crushing zone, in μm; k p is the pre-crushing efficiency calibration coefficient, fitted by calibration tests, with a value range of 0.8 to 2.5; n1 is the actual rotational speed in the pre-crushing zone, in r / min; n 10 δ is the rated speed of the pre-crushing zone, in r / min; δ is the actual crushing gap of the pre-crushing zone, in mm; δ0 is the rated crushing gap of the pre-crushing zone, in mm; ε p This is a correction term, determined by experimental calibration.

[0029] In S1, the operating parameters for dynamically adjusting the vortex shear zone include: according to D 50The deviation from the set value is used to adjust the grinding disc speed in a reverse correlation: ; In the formula: n2 is the target rotational speed of the grinding disc in the vortex shear zone, in r / min; n 20 It is the basic rotational speed of the grinding disc in the vortex shear zone, and the unit is r / min; This is the speed regulation correlation coefficient, a negative correlation correction coefficient, with a value range of 0.1 to 0.9, calibrated experimentally; D set The median particle size D of the discharge from the pre-crushing zone 50 The set value is in μm.

[0030] Then, with the vortex shear zone cyclic load rate L c As a second linkage hub, the cyclic load rate of the vortex shear zone is calculated in real time or estimated through a load rate calculation model; based on this L... c The value is used to coordinate the crushing intensity of the pre-crushing zone and the grinding intensity of the fine grinding zone; when L c When the value remains above the set upper limit, it is determined that the grinding capacity of the vortex shear zone is relatively insufficient or the feed material is too coarse. Therefore, an instruction is given to increase the impact crushing intensity of the pre-crushing zone, and / or to increase the grinding efficiency of the fine grinding zone to share the task of fine powder generation. When L... c If the price remains below the set lower limit, the adjustment will reverse.

[0031] In S2, the circulating load rate is the ratio of the return material to the discharge material in the vortex shear zone, which is a core indicator of the grinding capacity matching degree. The circulating load rate of the vortex shear zone is calculated using a load rate calculation model. The mathematical expression of the load rate calculation model is as follows: ; In the formula: L c It is the cyclic load factor, dimensionless; Q r Q is the material return rate in the vortex shear zone, measured in t / h; p Q is the finished product output rate of the vortex shear zone, in t / h; in2 Q is the feed rate in the vortex shear zone, measured in t / h; out2 It is the total output of the vortex shear zone (finished product + recycled material), and the unit is t / h.

[0032] In S2, adjusting the crushing strength of the pre-crushing zone according to the cyclic load rate includes: Crushing strength is characterized by "specific impact energy," which is achieved by increasing the rotational speed in the pre-crushing zone. ; When L c >L c_high At the same time, adjust the rotation speed of the pre-crushing zone: ; In the formula: E p It is the specific impact energy of the pre-fractured zone, measured in kJ / kg; k e α is the energy transfer coefficient, determined experimentally; α is the crushing strength adjustment coefficient, ranging from 0.05 to 0.55; L c_high It is the upper limit threshold of the cyclic load rate; when L c >L c_high When α is negative, it takes a negative value.

[0033] In S2, adjusting the grinding intensity of the fine grinding zone based on the real-time value of the cycle load rate includes: Grinding intensity is characterized by both "specific surface area of ​​the medium" and "rotation speed," and can be achieved by increasing the stirring speed or the medium filling rate. ; When L c >L c_high At the same time, adjust the rotation speed of the fine grinding zone: ; In the formula: E g It is the specific grinding energy of the fine abrasion zone, measured in kJ / kg; k g This is the grinding efficiency coefficient, determined experimentally; φ is the media filling rate; n3 is the stirring speed in the fine grinding zone, in r / min; n 30 β is the basic rotational speed in the fine grinding zone, measured in r / min; β is the grinding intensity adjustment coefficient, ranging from 0.1 to 0.95; when L c >L c_high When β is negative, it takes a negative value.

[0034] Finally, the target particle size index S of the product is used as the global optimization target, and the target value of the particle size index S of the final product is set. When the product particle size index deviates from the target by online detection or model feedback, the operating parameters of the fine grinding zone (such as stirring speed and media filling rate) are adjusted first. If the target is still not met after adjustment, the operating parameters of the vortex shear zone (such as grinding gap and shearing speed) are adjusted in reverse and linked. By changing the particle characteristics of the fine grinding zone, the particle size of the product is finally optimized.

[0035] In S3, the operating parameters for the fine abrasion zone that are adjusted first include: When |S S set |>ΔS allow At the same time, prioritize adjusting the media filling rate in the fine abrasion zone: ; In the formula: φ0 is the basic value of the medium filling rate; This is the fill rate adjustment coefficient, with a value range of -0.5 to -1.0 (negative correlation; increasing the fill rate can decrease S); ΔSallow This is the allowable deviation of the particle size index.

[0036] In S3, the operating parameters for reverse tracing and linkage adjustment of the vortex shear zone include: If adjusting φ still does not meet the standard, then adjust the grinding gap δ2 in the vortex shear zone: ; In the formula: δ2 is the grinding gap in the vortex shear zone, in mm; δ 20 This is the basic value of the grinding gap, in mm; k δ It is the gap adjustment coefficient, with a value range of 0.02 to 0.90.

[0037] The three-zone force field coupling model is established and calibrated through the following steps: Step 1: In the equipment design phase, based on the principles of grinding kinetics, mass balance, and energy conservation, establish a set of mechanistic equations describing the relationship between mass flow, particle size distribution, and energy transfer in the three zones.

[0038] Step Two: In the initial stage of equipment commissioning and operation, a series of calibration tests are conducted to obtain key operating parameters (speed of the pre-crushing zone, speed and gap of the vortex shear zone, and speed and filling rate of the fine grinding zone) and two linkage hub variables (D) under different working conditions. 50 L c The correlation data between the final product indicators (granularity) and the final product indicators.

[0039] Step 3: Using the data obtained in Step 2, fit and calibrate the specific coefficients (such as crushing efficiency coefficient, grading efficiency coefficient, and particle size conversion coefficient) in the mechanistic equation set in Step 1 to form a quantitative coupling model that can be used for real-time control.

[0040] Three-zone force field coupling model calibration: By calibrating experimental data, the key coefficients (such as k) in the mechanistic equation are fitted using the least squares method. p k c k e The objective function is to minimize the deviation between the model-calculated values ​​and the measured values. ; In the formula: Y i,cal It is the model calculation value of the i-th group of experiments (e.g., D) 50 L c S); Y i,meas is the measured value of the i-th test group; m is the number of calibration test groups (m≥30 to ensure fitting accuracy).

[0041] The control method is implemented through a main controller, which embeds the calibrated "three-zone force field coupling model". The main controller receives signals from the online particle size analyzer, circulating load metering device, torque sensor, and air volume and pressure sensor, and calculates or acquires D in real time. 50 With L c The system calculates the value and, based on the linkage logic defined in the model, sends coordinated adjustment commands to the sub-controllers (such as frequency converters, hydraulic stations, and feeder controllers) of each zone.

[0042] The particle size index is a statistical value of particle size obtained through offline sampling image analysis or online particle analyzer.

[0043] A second embodiment provides a three-zone force field coordinated control system for a composite force field grinding equipment, used to implement the method of the first embodiment described above. Following the material processing sequence, the three zones include a pre-crushing zone, a vortex shearing zone, and a fine grinding zone. The coordinated control system includes: The dynamic adjustment module uses the median discharge particle size of the pre-crushing zone as the first linkage hub, and dynamically adjusts the operating parameters of the vortex shear zone according to the median discharge particle size. The coordinated adjustment module uses the cyclic load rate of the vortex shear zone as the second linkage hub, and adjusts the crushing intensity of the pre-crushing zone and the grinding intensity of the fine grinding zone in a coordinated manner according to the cyclic load rate. The global optimization module uses the final product particle size index as the global optimization target. Based on the deviation between the particle size index and the target value, it prioritizes adjusting the operating parameters of the fine grinding zone. If the target is still not met after adjustment, it traces back and adjusts the operating parameters of the vortex shear zone in conjunction with the target. By changing the particle characteristics of the fine grinding zone, particle size optimization is finally achieved.

[0044] A specific application example is the grinding of high-hardness quartz sandstone: The target specific surface area of ​​the final product is set to be ≥500m² / kg. The main controller calculates a set of initial coordinated parameters based on the built-in calibrated "three-zone force field coupling model": hammer linear velocity in the pre-crushing zone is 52m / s, grinding pressure in the vortex shearing zone is 11.5MPa and gap is 1.5mm, and stirring speed in the fine grinding zone is 38rpm.

[0045] Operating Condition A: Raw material particle size fluctuation. Online monitoring detected a median particle size D at the discharge from the pre-crushing zone. 50 The thickness was increased from the designed 8mm to 12mm (the raw material became coarser). The main controller operates according to the model logic ( Figure 3 Immediately increase the mill speed setting of the vortex shear zone to 50 rpm according to the predetermined ratio to ensure sufficient crushing force. At the same time, fine-tune the classifier speed to stabilize the classification efficiency and prevent the circulating load rate from decreasing due to coarser feed material. c A sharp rise.

[0046] Condition B: Product specific surface area does not meet the standard. The main controller initiates optimization logic with S as the target. Figure 4 First, the stirring speed in the fine grinding zone was increased to 45 rpm to enhance the grinding effect. If the specific surface area did not improve significantly after a period of time, the model determined that this might be due to excessive coarse particles generated in the front zone, exceeding the processing capacity of zone C. Therefore, the main controller adjusted the operating parameters of the vortex shear zone: appropriately reducing the grinding gap to 1.3 mm and increasing the shearing speed, changing the crushing mechanism, and reducing the production of excessively coarse particles, thereby assisting zone C in better completing the particle size optimization task.

[0047] Operating condition C: Load balance. Cyclic load rate L c The level remains consistently high. The main controller, based on the model ( Figure 4 The analysis indicated that the vortex shear zone was in a state of "poor digestion." On one hand, the pre-crushing zone was instructed to increase the hammerhead linear velocity to 55 m / s to enhance the coarse crushing effect and reduce the burden on the main grinding zone; on the other hand, the fine grinding zone was instructed to appropriately increase the media filling rate to enhance its ability to generate fine powder independently, thus jointly promoting L... c Returning to a reasonable range.

[0048] Through the aforementioned coordinated control, the equipment exhibits a strong adaptive capability when facing fluctuations in raw material prices, the system power consumption remains stable at a low level, and product indicators consistently fluctuate slightly around the set targets, achieving efficient, stable, and high-quality operation.

[0049] In summary, this invention, by establishing and applying a "three-zone force field coupling model" with key process variables as the hub, achieves the organic coordination and dynamic balance of the operating parameters of the three core functional zones of the composite force field grinding equipment. The control logic is clear and effective, the innovation is prominent, and it has good industrial application and patent licensing value.

[0050] The third embodiment is a computer program product, including a computer program that is executed by a processor as described above for the three-zone force field coordinated control method for composite force field grinding equipment.

[0051] Fourth embodiment: A computer-readable storage medium includes instructions that, when executed on a computer, cause the computer to perform the above-described three-zone force field coordinated control method for composite force field grinding equipment.

[0052] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented, in whole or in part, as a computer program product, the computer program product includes one or more computer instructions. When the computer program instructions are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)).

[0053] The above description is only a preferred embodiment of the present invention. It should be noted that any improvements, modifications, substitutions or variations made by those skilled in the art without departing from the principle of the present invention should be considered as being included within the protection scope of the present invention.

Claims

1. A three-zone force field coordinated control method for composite force field grinding equipment, wherein the three zones, along the material processing sequence, include a pre-crushing zone, a vortex shearing zone, and a fine grinding zone; characterized in that, Collaborative control methods include: S1. Using the median discharge particle size of the pre-crushing zone as the first linkage hub, the operating parameters of the vortex shear zone are dynamically adjusted according to the median discharge particle size. S2. Using the cyclic load rate of the vortex shear zone as the second linkage hub, the crushing intensity of the pre-crushing zone and the grinding intensity of the fine grinding zone are adjusted in a coordinated manner according to the cyclic load rate. S3. Using the product target particle size index as the global optimization target, the operation parameters of the fine grinding zone are adjusted first based on the deviation between the particle size index and the target value. If the target is still not met after adjustment, the operation parameters of the vortex shear zone are adjusted in reverse and linked. By changing the particle characteristics of the input fine grinding zone, particle size optimization is finally achieved.

2. The three-zone force field coordinated control method for composite force field grinding equipment according to claim 1, characterized in that, In S1, the median discharge particle size is obtained using a median discharge particle size estimation model; the mathematical expression for the median discharge particle size estimation model is: ； In the formula: D 50 This is the median particle size of the output from the pre-crushing zone, in μm; D in This is the median feed particle size in the pre-crushing zone, in μm; k p n1 is the pre-crushing efficiency calibration coefficient, with a value range of 0.8 to 2.5; n1 is the actual rotational speed in the pre-crushing zone, in r / min; n 10 δ is the rated speed of the pre-crushing zone, in r / min; δ is the actual crushing gap of the pre-crushing zone, in mm; δ0 is the rated crushing gap of the pre-crushing zone, in mm; ε p It is a correction item.

3. The three-zone force field coordinated control method for composite force field grinding equipment according to claim 2, characterized in that, In S1, the operating parameters for dynamically adjusting the vortex shear zone include: according to D 50 The deviation from the set value is used to adjust the grinding disc speed in a reverse correlation: ； In the formula: n2 is the target rotational speed of the grinding disc in the vortex shear zone, in r / min; n 20 It is the basic rotational speed of the grinding disc in the vortex shear zone, and the unit is r / min; This is the speed regulation correlation coefficient, with a value range of 0.1 to 0.9; D set The median particle size D of the discharge from the pre-crushing zone 50 The set value is in μm.

4. The three-zone force field coordinated control method for composite force field grinding equipment according to claim 3, characterized in that, In S2, the cyclic load rate of the vortex shear zone is estimated using a load rate calculation model; the mathematical expression of the load rate calculation model is as follows: ； In the formula: L c It is the cyclic load factor, dimensionless; Q r Q is the material return rate in the vortex shear zone, measured in t / h; p Q is the finished product output rate of the vortex shear zone, in t / h; in2 Q is the feed rate in the vortex shear zone, measured in t / h; out2 It is the total output of the vortex shear zone, in t / h.

5. The three-zone force field coordinated control method for composite force field grinding equipment according to claim 4, characterized in that, In S2, adjusting the crushing strength of the pre-crushing zone according to the cyclic load rate includes: Crushing strength is characterized by "specific impact energy," which is achieved by increasing the rotational speed in the pre-crushing zone. ； When L c >L c_high At the same time, adjust the rotation speed of the pre-crushing zone: ； In the formula: E p It is the specific impact energy of the pre-fractured zone, measured in kJ / kg; k e α is the energy transfer coefficient, determined experimentally; α is the crushing strength adjustment coefficient, ranging from 0.05 to 0.55; L c_high It is the upper limit threshold of the cyclic load rate; when L c >L c_high When α is negative, it takes a negative value.

6. The three-zone force field coordinated control method for composite force field grinding equipment according to claim 5, characterized in that, In S2, adjusting the grinding intensity of the fine grinding zone based on the real-time value of the cycle load rate includes: Grinding intensity is characterized by both "specific surface area of ​​the medium" and "rotation speed," and can be achieved by increasing the stirring speed or the medium filling rate. ； When L c >L c_high At the same time, adjust the rotation speed of the fine grinding zone: ； In the formula: E g It is the specific grinding energy of the fine abrasion zone, measured in kJ / kg; k g This is the grinding efficiency coefficient, determined experimentally; φ is the media filling rate; n3 is the stirring speed in the fine grinding zone, in r / min; n 30 β is the basic rotational speed in the fine grinding zone, measured in r / min; β is the grinding intensity adjustment coefficient, ranging from 0.1 to 0.95; when L c >L c_high When β is negative, it takes a negative value.

7. The three-zone force field coordinated control method for composite force field grinding equipment according to claim 6, characterized in that, In S3, the operating parameters for the fine abrasion zone that are adjusted first include: When |S S set |>ΔS allow At the same time, prioritize adjusting the media filling rate in the fine abrasion zone: ； In the formula: φ0 is the basic value of the medium filling rate; k φ This is the fill rate adjustment coefficient, with a value range of -0.5 to -1.0; ΔS allow This is the allowable deviation of the particle size index.

8. The three-zone force field coordinated control method for composite force field grinding equipment according to claim 7, characterized in that, In S3, the operating parameters for reverse tracing and linkage adjustment of the vortex shear zone include: If adjusting φ still does not meet the standard, then adjust the grinding gap δ2 in the vortex shear zone: ； In the formula: δ2 is the grinding gap in the vortex shear zone, in mm; δ 20 This is the basic value of the grinding gap, in mm; k δ It is the gap adjustment coefficient, with a value range of 0.02 to 0.

90.

9. A three-zone force field coordinated control system for composite force field grinding equipment, wherein the three zones, along the material processing sequence, include a pre-crushing zone, a vortex shearing zone, and a fine grinding zone; characterized in that, The collaborative control system includes: The dynamic adjustment module uses the median discharge particle size of the pre-crushing zone as the first linkage hub, and dynamically adjusts the operating parameters of the vortex shear zone according to the median discharge particle size. The coordinated adjustment module uses the cyclic load rate of the vortex shear zone as the second linkage hub, and adjusts the crushing intensity of the pre-crushing zone and the grinding intensity of the fine grinding zone in a coordinated manner according to the cyclic load rate. The global optimization module uses the product target particle size index as the global optimization target. Based on the deviation between the particle size index and the target value, it prioritizes adjusting the operating parameters of the fine grinding zone. If the target is still not met after adjustment, it traces back and adjusts the operating parameters of the vortex shear zone in conjunction with the target. By changing the particle characteristics of the fine grinding zone, particle size optimization is finally achieved.

10. A computer-readable storage medium comprising instructions, when executed on a computer, causing the computer to perform the three-zone force field coordinated control method for a composite force field grinding equipment as described in any one of claims 1-8.

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