Method for controlling the particle size of a wettable powder based on an air-jet mill

Abstract

The present application relates to the technical field of pulverization control, in particular to a wettable powder particle size control method based on an airflow pulverizer, which first analyzes the uniformity of the equivalent particle size distribution of each pulverization monitoring position at each sampling time to determine the corresponding particle size uniformity; thereby comprehensively evaluating the corresponding material state value from the aspects of particle size uniformity and particle size; then determines the corresponding reference pulverization air pressure based on the size of the material state value relative to the prior standard state value and the prior standard pulverization air pressure; further analyzes the three dimensions of the material state value, the average particle size and the reference pulverization air pressure to comprehensively determine the speed regulation factor of each pulverization monitoring position; and thereby adaptively determines the speed of the regulating classification impeller at the outlet position of each pulverization chamber based on the speed regulation factor, so that the effect of producing the wettable powder according to the speed of the regulating classification impeller is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of crushing control, in particular to a wettable powder particle size control method based on an air flow crusher. BACKGROUND

[0002] The fluidized bed air flow crusher is an advanced ultra-micro air flow crushing equipment, commonly used for high-precision, high-purity powder production, such as wettable powder, etc. Its characteristics are in powder form, easy to disperse and mix, and can be evenly applied on the surface of crops. Its manufacturing principle is mainly through the air flow crusher to compress air or other gases and pass through the nozzle into the crushing chamber at high speed, so that the large particle materials are suspended in the air flow and form a fluidized state. The high-speed movement of the air flow causes the collision and friction between the material particles, thereby crushing the material particles into smaller particles.

[0003] In the prior art, when the wettable powder is crushed by the air flow crusher, the crushing chamber at each level is usually controlled at a fixed classification impeller speed for crushing. However, in actual crushing scenarios, the real-time particle size of the material is usually uneven, which may cause the particle size of the output powder product to deviate from the target particle size when the fixed classification impeller speed is used for crushing. That is, the prior art has low accuracy in controlling the particle size of the wettable powder at a fixed classification impeller speed, resulting in poor effect of the produced wettable powder. SUMMARY

[0004] In order to solve the technical problem that the prior art has low accuracy in controlling the particle size of the wettable powder at a fixed classification impeller speed, resulting in poor effect of the produced wettable powder, the purpose of the present application is to provide a wettable powder particle size control method based on an air flow crusher, and the technical solution adopted is as follows:

[0005] The first aspect of the present application provides a wettable powder particle size control method based on an air flow crusher, comprising:

[0006] Obtain the average particle size of the real-time material at each sampling time at each crushing monitoring position in the air flow crusher; wherein all the crushing monitoring positions include the raw material inlet position, the crushing chamber outlet position and each classification wheel outlet position, and all the crushing monitoring positions are arranged in sequence according to the crushing order of the material;

[0007] At each sampling time, determine the corresponding particle size uniformity according to the equivalent particle size distribution of each crushing monitoring position; determine the material state value of each crushing monitoring position according to the average particle size of each crushing monitoring position and the corresponding particle size uniformity; determine the corresponding reference crushing air pressure according to the material state value of the crushing chamber outlet position combined with the prior standard state value and the prior standard crushing air pressure;

[0008] determine a speed adjustment factor of each classification wheel outlet position according to the relative change of the reference crushing air pressure, the change of the material state value between each classification wheel outlet position and the previous crushing monitoring position, and the average particle size; and determine a controlled classification impeller speed of each classification wheel outlet position at each sampling time according to the speed adjustment factor;

[0009] perform wettable powder particle size control according to the reference crushing air pressure and the controlled classification impeller speed.

[0010] Further, the particle size uniformity acquisition process comprises:

[0011] acquire D10 data, D50 data and D90 data of real-time material at each sampling time of each crushing monitoring position; and determine a particle size dispersion parameter according to the difference between the D90 data and the D10 data.

[0012] determine a particle size uniformity of real-time material at each sampling time of each crushing monitoring position according to the relative size between the particle size dispersion parameter and the D50 data.

[0013] Further, the process of determining a particle size uniformity of real-time material at each sampling time of each crushing monitoring position according to the relative size between the particle size dispersion parameter and the D50 data comprises:

[0014] perform negative correlation mapping on the ratio between the particle size dispersion parameter and the D50 data to determine the particle size uniformity of real-time material at each sampling time of each crushing monitoring position.

[0015] Further, the material state value acquisition process comprises:

[0016] at each sampling time, determine a corresponding material state value according to the product of the negative correlation mapping value of the average particle size and the particle size uniformity of each crushing monitoring position.

[0017] Further, the reference crushing air pressure acquisition process comprises:

[0018] at each sampling time, determine a corresponding material state parameter according to the ratio between a priori standard material state value and the material state value of the crushing chamber outlet position.

[0019] take the crushing air pressure of the crushing chamber at the previous sampling time of each sampling time as a corresponding comparative crushing air pressure; and determine the reference crushing air pressure of the crushing chamber outlet position at each sampling time according to the product of the material state parameter and the comparative crushing air pressure.

[0020] Further, the speed adjustment factor acquisition process comprises:

[0021] determine a material screening characteristic value according to a relative deviation between the average particle size of each classification wheel outlet position at each sampling time and the corresponding prior target particle size;

[0022] determine a crushing change characteristic value according to the reference crushing air pressure deviation and the material state value deviation between each classification wheel outlet position and the previous crushing monitoring position;

[0023] determine a speed adjustment factor of each classification wheel outlet position at each sampling time according to the material screening characteristic value and the crushing change characteristic value.

[0024] Further, the process of obtaining the material screening characteristic value includes:

[0025] at each sampling time, take the difference between the average particle size of each classification wheel outlet position and the corresponding prior target particle size as the reference screening degree; determine the corresponding material screening characteristic value according to the ratio between the reference screening degree and the prior target particle size.

[0026] Further, the process of obtaining the crushing change characteristic value includes:

[0027] at each sampling time, negatively correlate the difference between the material state value of each classification wheel outlet position and the material state value of the previous crushing monitoring position to determine the corresponding screening effect characteristic value;

[0028] determine a gas pressure influence value according to the ratio between the reference crushing air pressure of the crushing chamber outlet position at each sampling time and the crushing air pressure at the previous sampling time;

[0029] normalize the product between the screening effect characteristic value and the gas pressure influence value to determine the crushing change characteristic value of each classification wheel outlet position.

[0030] Further, the process of determining the speed adjustment factor of each classification wheel outlet position at each sampling time according to the material screening characteristic value and the crushing change characteristic value includes:

[0031] positively correlate the average value between the material screening characteristic value and the crushing change characteristic value to determine the speed adjustment factor of each classification wheel outlet position at each sampling time.

[0032] Further, the process of obtaining the speed adjustment factor of the classification impeller includes:

[0033] At each sampling time, the product of the real-time classification impeller rotating speed of the classification impeller corresponding to each classification wheel outlet position and the rotating speed adjustment factor is determined as the corresponding regulated classification impeller rotating speed.

[0034] In a second aspect, the present application provides a wettable powder particle size control system based on a jet mill, the system comprising:

[0035] A data acquisition pre-processing module is configured to acquire the average particle size of the real-time material at each sampling time in each crushing monitoring position of the jet mill; wherein all the crushing monitoring positions include the raw material inlet position, the crushing chamber outlet position, and each classification wheel outlet position, and all the crushing monitoring positions are arranged in sequence according to the crushing sequence of the material.

[0036] A first determining module is configured to determine the corresponding particle size uniformity according to the equivalent particle size distribution of each crushing monitoring position at each sampling time; determine the material state value of each crushing monitoring position according to the average particle size of each crushing monitoring position and the corresponding particle size uniformity; and determine the corresponding reference crushing gas pressure according to the material state value of the crushing chamber outlet position in combination with the prior standard state value and the prior standard crushing gas pressure.

[0037] A second determining module is configured to determine the rotating speed adjustment factor of each classification wheel outlet position according to the relative change of the reference crushing gas pressure, the change of the material state value between each classification wheel outlet position and the previous crushing monitoring position, and the average particle size; and determine the regulated classification impeller rotating speed of each classification wheel outlet position at each sampling time according to the rotating speed adjustment factor.

[0038] A particle size control module is configured to perform wettable powder particle size control according to the reference crushing gas pressure and the regulated classification impeller rotating speed.

[0039] In a third aspect, the present application provides a computer device comprising a memory and a processor. The memory is configured to store computer program code, and the processor is configured to call and run the computer program code from the memory to execute the method of the first aspect or any embodiment of the first aspect of the present application.

[0040] In a fourth aspect, the present application provides a computer program product comprising computer program code, which, when executed, performs the method of the first aspect or any embodiment of the first aspect of the present application.

[0041] In a fifth aspect, the present application provides a computer-readable storage medium storing computer program code, which, when executed, performs the method of the first aspect or any embodiment of the first aspect of the present application.

[0042] The present application has the following beneficial effects:

[0043] The present application first analyzes the uniformity of the equivalent particle size distribution of each pulverization monitoring position at each sampling time, determines the corresponding particle size uniformity; thereby comprehensively evaluates the corresponding material state value from the aspects of particle size uniformity and particle size; then determines the corresponding reference pulverization air pressure based on the size of the material state value relative to the prior standard state value combined with the prior standard pulverization air pressure; further analyzes in three dimensions of the material state value, the average particle size, and the reference pulverization air pressure, and comprehensively determines the speed regulation factor of each pulverization monitoring position; thereby adaptively determines the speed regulation factor of each pulverization monitoring position based on the speed regulation factor, so that the effect of producing wettable powder according to the speed regulation factor is better. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art and the advantages thereof, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0045] Figure 1 A flow chart of a wettable powder particle size control method based on an air flow pulverizer provided by an embodiment of the present application;

[0046] Figure 2 A pulverization monitoring position distribution schematic diagram provided by an embodiment of the present application;

[0047] Figure 3 A structure diagram of a wettable powder particle size control system based on an air flow pulverizer provided by an embodiment of the present application;

[0048] Figure 4 A computer device structure schematic diagram provided by an embodiment of the present application. DETAILED DESCRIPTION

[0049] In order to further clarify the technical means and effects taken by the present application to achieve the predetermined inventive objectives, the following describes in detail the specific implementation, structure, features and effects of a wettable powder particle size control method based on an air flow pulverizer according to the present application, with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment, and the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form. In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features with "first", "second" can be explicitly or implicitly included one or more features.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0051] The specific scheme of the wettable powder particle size control method based on an air flow pulverizer provided by the present application is described below in detail with reference to the accompanying drawings.

[0052] The present application provides a wettable powder particle size control method based on an air flow pulverizer. Please refer to Figure 1 which shows a flow chart of a wettable powder particle size control method based on an air flow pulverizer provided by one embodiment of the present application. The method comprises:

[0053] Step S101: Obtain the average particle size of the real-time material at each sampling time in each pulverizing monitoring position of the air flow pulverizer; wherein all the pulverizing monitoring positions include the raw material inlet position, the pulverizing chamber outlet position and the outlet position of each classification wheel, and all the pulverizing monitoring positions are arranged in order according to the pulverizing sequence of the material.

[0054] A laser particle size analyzer is arranged at each pulverizing monitoring position to monitor all particle sizes of the real-time material, i.e. the powder, at each sampling time in the corresponding pulverizing monitoring position; the average value of all particle sizes of the real-time material at each sampling time in each pulverizing monitoring position is taken as the corresponding average particle size; and the D10 data, D50 data and D90 data of each pulverizing monitoring position at each sampling time are determined according to all particle sizes of the real-time material.

[0055] In one specific implementation of the embodiment of the present application, the pulverizing monitoring positions include the raw material inlet position, the pulverizing chamber outlet position and the outlet position of each classification wheel; and the raw material inlet position, the pulverizing chamber outlet position, the coarse classification wheel outlet position and the fine classification wheel outlet position are arranged in order according to the pulverizing sequence. Please refer to Figure 2Fig. 1 shows a schematic diagram of a crushing monitoring position distribution according to an embodiment of the present application, wherein, is a raw material inlet position, i.e., a first crushing monitoring position; is a crushing chamber outlet position, i.e., a second crushing monitoring position; is a coarse classification wheel outlet position, i.e., a third crushing monitoring position; is a fine classification wheel outlet position, i.e., a fourth crushing monitoring position; the sampling frequency is set to one sample per second, which can be adjusted according to the specific implementation environment, and will not be further described here.

[0056] Step S102: At each sampling time, determine the corresponding particle size uniformity according to the equivalent particle size distribution of each crushing monitoring position; determine the material state value of each crushing monitoring position according to the average particle size and the corresponding particle size uniformity of each crushing monitoring position; and determine the corresponding reference crushing air pressure according to the material state value of the crushing chamber outlet position in combination with the prior standard state value and the prior standard crushing air pressure.

[0057] For each crushing monitoring position, the more uniform the particle size distribution, the stronger the particle size consistency of the material, which means that the particle size is more regular, the material state is better, and the degree of adjustment and control should be smaller. Therefore, first, determine the corresponding particle size uniformity according to the equivalent particle size distribution of each crushing monitoring position at each sampling time.

[0058] Preferably, in some possible implementation manners of the embodiment of the present application, the process of obtaining the particle size uniformity includes:

[0059] Obtain the D10 data, D50 data and D90 data of the real-time material of each crushing monitoring position at each sampling time; and determine the particle size dispersion parameter according to the difference between the D90 data and the D10 data. It should be noted that the D10 data, D50 data and D90 data are technical terms for describing particle size distribution known to those skilled in the art. The D10 data represents the particle size corresponding to the cumulative particle size distribution percentage of 10% in the sample, the D50 data represents the particle size corresponding to the cumulative particle size distribution percentage of 50% in the sample, and the D90 data represents the particle size corresponding to the cumulative particle size distribution percentage of 90% in the sample. Therefore, the smaller the difference between the D90 data and the D10 data, the more concentrated the particle size, and the more uniform the overall particle size distribution. Considering that the particle size dispersion parameter can be affected by the particle size in the scene, the relative size between the particle size dispersion parameter and the D50 data is further determined to determine the particle size uniformity of the real-time material of each crushing monitoring position at each sampling time. The D50 data size in the scene is introduced on the basis of the particle size dispersion parameter to reduce the influence of the particle size on the calculation of the particle size uniformity, so that the obtained particle size uniformity is more accurate.

[0060] Preferably, in some possible implementation manners of the embodiment of the present application, the process of determining the particle size uniformity of the real-time material at each sampling moment at each crushing monitoring position according to the relative size between the particle size dispersion parameter and the D50 data comprises: performing a negative correlation mapping on the ratio between the particle size dispersion parameter and the D50 data to determine the particle size uniformity of the real-time material at each sampling moment at each crushing monitoring position. In a specific implementation manner of the embodiment of the present application, the process of obtaining the particle size uniformity is expressed by a formula as follows: ; wherein, is the particle size uniformity at the sampling moment at the crushing monitoring position ; is the D90 data at the sampling moment at the crushing monitoring position ; is the D10 data at the sampling moment at the crushing monitoring position ; is the D50 data at the sampling moment at the crushing monitoring position ; is the particle size dispersion parameter at the sampling moment at the crushing monitoring position . By taking the D50 data as the denominator to limit the value of the particle size dispersion parameter, the influence of the particle size in different scenarios on the calculation of the particle size uniformity is reduced. is an exponential function with a natural constant as the base, and the normalization method can be adjusted according to the specific implementation environment, for example , wherein, is a min-max normalization function.

[0061] In the scenario of crushing by a crusher, the smaller the overall particle size data obtained after the material is crushed, the smaller the crushing effect, and the better the corresponding material state should be; therefore, the material state value of each crushing monitoring position is further determined according to the average particle size of each crushing monitoring position on the basis of the particle size uniformity. Preferably, in some possible implementation manners of the embodiment of the present application, the process of obtaining the material state value comprises:

[0062] Since the smaller the overall particle size data obtained after the material is crushed, the larger the corresponding material state value should be; and the larger the particle size uniformity, the better the material state is; therefore, at each sampling moment, the corresponding material state value is determined according to the product between the negative correlation mapping value of the average particle size of each crushing monitoring position and the particle size uniformity. In a specific implementation manner of the embodiment of the present application, the process of obtaining the material state value is expressed by a formula as follows: ; wherein is a crushing monitoring position is a sampling time is a material state value at the sampling time under the crushing monitoring position. is a crushing monitoring position is a sampling time is a particle size uniformity at the sampling time under the crushing monitoring position. is a crushing monitoring position is a sampling time is a material state value at the sampling time under the crushing monitoring position. is a min-max normalization function.

[0063] For the crushing chamber, when the material enters the crushing chamber, it is crushed by applying air pressure, and the smaller the material state value of the output material after entering the crushing chamber, that is, the more uneven the particle size distribution and the larger the overall particle size, the worse the crushing effect, at this time, the greater the crushing air pressure is needed to improve the crushing effect, and vice versa.

[0064] Preferably, in some possible implementation manners of the embodiment of the present application, the acquisition process of the reference crushing air pressure comprises:

[0065] At each sampling time, a corresponding material state parameter is determined according to the ratio between the prior standard material state value and the material state value at the outlet position of the crushing chamber; the smaller the material state value at the outlet position of the crushing chamber compared with the prior standard material state value under normal circumstances, the worse the crushing effect of the crushing chamber, and the greater the corresponding air pressure value should be to improve the crushing effect; therefore, the crushing air pressure of the crushing chamber at the previous sampling time of each sampling time is further taken as the corresponding comparative crushing air pressure; and the reference crushing air pressure at the outlet position of the crushing chamber at each sampling time is determined according to the product between the material state parameter and the comparative crushing air pressure.

[0066] It should be noted that the acquisition process of the prior standard material state value and the material state value is the same, and the difference lies in that the prior standard material state value is the material state value corresponding to the particle size distribution data when the crushing effect reaches the rated expected standard of the crushing chamber, that is, the value needs to be acquired in advance according to the expected standard of the crushing chamber, which will not be described further herein. In another specific implementation manner of the embodiment of the present application, all data in the historical data that meet the standard material distribution at the outlet position of the crushing chamber are manually selected and the corresponding material state values are calculated, and the mean value of all the material state values is taken as the prior standard material state value, which will not be described further herein.

[0067] In addition, it should be noted that when the reference crushing air pressure is less than the minimum crushing air pressure of the crushing chamber, the reference crushing air pressure is assigned the size of the minimum crushing air pressure; and when the reference crushing air pressure is greater than the maximum crushing air pressure of the crushing chamber, the reference crushing air pressure is assigned the size of the maximum crushing air pressure, which will not be described further herein.

[0068] Step S103: determining a rotational speed adjustment factor of each classification wheel outlet position according to the relative variation of the reference crushing air pressure, the variation of the material state value between each classification wheel outlet position and the previous crushing monitoring position, and the average particle size; and determining the regulated classification impeller rotational speed of each classification wheel outlet position at each sampling time according to the rotational speed adjustment factor.

[0069] After the material is crushed in the crushing chamber, it enters the classification chamber through the pipeline. The classification chamber includes a coarse classification wheel and a fine classification wheel. The classification wheel mainly screens the crushed material through the impeller. The greater the rotational speed of the classification wheel, the finer the powder that is trapped, and the stronger the ability to screen finer powder. Then, the difference in the state of the material before and after the classification wheel screening can indirectly represent the corresponding screening ability. The greater the corresponding difference, the stronger the screening ability. In addition, since the raw material enters the crushing chamber, the coarse classification wheel, and the fine classification wheel in turn to complete the crushing, the greater the crushing air pressure in the crushing chamber, the more frequent and intense the collision between the particles, resulting in more rapid crushing of the particles. Therefore, more particles will reach the classification wheel after the crushing chamber. In order to improve the screening accuracy of the classification wheel, it is necessary to increase the classification impeller speed to help improve the speed of the particles in the airflow moving to the outside, thereby effectively separating larger particles. Conversely, a lower speed is required to prevent idling. Therefore, for each classification wheel, if the crushing air pressure in the crushing chamber increases at the corresponding sampling time, a higher impeller speed is required. Therefore, the rotational speed adjustment factor of each classification wheel outlet position is determined according to the relative variation of the reference crushing air pressure, the variation of the material state value between each classification wheel outlet position and the previous crushing monitoring position, and the average particle size.

[0070] Preferably, in some possible implementation manners of the embodiments of the present application, the process of obtaining the rotational speed adjustment factor includes:

[0071] According to the relative deviation between the average particle size of each classification wheel outlet position at each sampling time and the corresponding prior target particle size, a corresponding material screening characteristic value is determined. The process of obtaining the material screening characteristic value includes: at each sampling time, the difference between the average particle size of each classification wheel outlet position and the corresponding prior target particle size is taken as the reference screening degree; and the corresponding material screening characteristic value is determined according to the ratio between the reference screening degree and the prior target particle size. The prior target particle size is the standard particle size that each classification wheel should divide under normal circumstances, which can be obtained in advance through experiments. The size of the prior target particle size of different classification wheels is different, and will not be described further herein.

[0072] For each classifying wheel, its corresponding average particle size is the particle size data output by the classifying wheel. Therefore, the reference screening degree actually characterizes the deviation of the screening result of the classifying wheel from the expected target. When the value is negative, it indicates that the average particle size of the classifying wheel exceeds the expected target, and the rotation speed of the classifying wheel needs to be reduced. When the value is positive, it indicates that the average particle size of the classifying wheel does not reach the target particle size, and the rotation speed of the classifying wheel needs to be increased. Here, the prior target particle size is further used as the denominator to avoid the influence of the particle size range of different classifying wheels on the calculation process, making the calculated material screening characteristic value more accurate. It should be noted that, in order to avoid the reference screening degree being 0 and affecting subsequent calculations, this embodiment of the invention uses 0.1 as the reference screening degree for analysis when the difference between the average particle size at the classifying wheel outlet position and the corresponding prior target particle size is 0. This will not be elaborated further here.

[0073] Based on the reference crushing air pressure deviation and the material state value deviation between the outlet position of each classifier wheel and the previous crushing monitoring position, the corresponding crushing change characteristic value is determined. The process of obtaining the crushing change characteristic value includes: at each sampling time, negatively correlating the difference between the material state value at the outlet position of each classifier wheel and the material state value at the previous crushing monitoring position to determine the corresponding screening effect characteristic value; and determining the corresponding air pressure influence value based on the ratio between the reference crushing air pressure at the outlet position of the crushing chamber at each sampling time and the crushing air pressure at the previous sampling time.

[0074] Material state values ​​are obtained through average particle size and particle size uniformity. After passing through the classifying wheel, the smaller the difference between the corresponding material state value and the material state value at the previous crushing monitoring position (i.e., the crushing chamber outlet position), the worse the screening effect of the classifying wheel, and the more the corresponding rotation speed needs to be increased; therefore, the larger the corresponding screening effect characteristic value, the higher the required rotation speed. When the reference crushing air pressure at the crushing chamber outlet position becomes larger than the crushing air pressure at the previous sampling time, the rotation speed of the classifying wheel should be higher under the influence of air pressure; that is, the larger the air pressure influence value, the higher the required rotation speed. Therefore, the product between the screening effect characteristic value and the air pressure influence value is normalized to determine the crushing change characteristic value at each classifying wheel outlet position, so that the larger the crushing change characteristic value, the higher the required rotation speed.

[0075] In one specific implementation of this invention, the process of obtaining the crushing change characteristic value is expressed by the following formula: ;in, For the staged wheel exit position At sampling time The characteristic values ​​of the crushing change below; Sampling time Lower stage wheel outlet position The difference between the material state value at the current crushing monitoring location and the material state value at the previous crushing monitoring location; For the staged wheel exit position At sampling time The characteristic value of the screening effect under the condition; The location of the pulverizing chamber outlet at the sampling time The reference pulverizing air pressure below; The location of the pulverizing chamber outlet at the sampling time The crushing air pressure at the previous sampling time; The location of the pulverizing chamber outlet at the sampling time The influence of air pressure.

[0076] Furthermore, based on the material screening characteristic value and the crushing change characteristic value, the speed adjustment factor at the outlet position of each classifier impeller at each sampling time is determined. Specifically, a positive correlation mapping is performed between the mean values ​​of the material screening characteristic value and the crushing change characteristic value to determine the speed adjustment factor at the outlet position of each classifier impeller at each sampling time. Since the larger the material screening characteristic value and the larger the crushing change characteristic value, the higher the speed required by the corresponding classifier impeller, the higher the speed adjustment factor should be, and the higher the speed of the classifier impeller should be.

[0077] In one specific implementation of this invention, the process of obtaining the speed adjustment factor is expressed by the following formula: ;in, For the staged wheel outlet position At sampling time The speed adjustment factor is below; To preset the positive correlation mapping parameter, this embodiment of the invention sets it to 0.5, which can be adjusted according to the specific implementation environment; For the staged wheel exit position At sampling time The material screening characteristic values ​​below; For the staged wheel exit position At sampling time The characteristic value of the crushing change.

[0078] Further, based on the speed adjustment factor, the speed of the stage impeller is determined. Preferably, in some possible implementations of this invention, the process of obtaining the speed of the stage impeller includes: at each sampling time, multiplying the real-time speed of the stage impeller corresponding to the outlet position of each stage impeller with the speed adjustment factor to determine the corresponding speed of the stage impeller.

[0079] Step S104: Control the particle size of wettable powder based on the reference pulverizing air pressure and the speed of the classifying impeller.

[0080] Finally, according to the reference pulverization gas pressure of the outlet position of the pulverizing chamber and the regulated classification impeller rotating speed of the outlet position of the classification wheel at each sampling moment determined previously, the wettable powder particle size control is performed, specifically: the reference pulverization gas pressure at each sampling moment is taken as the pulverization gas pressure of the pulverizing chamber at the next sampling moment for control; the regulated classification impeller rotating speed of the outlet position of the classification wheel at each sampling moment is taken as the real-time classification impeller rotating speed of the corresponding classification wheel at the next sampling moment for control; wherein the corresponding classification wheel outlet position of each classification wheel is behind the classification wheel, which is not further described here.

[0081] In summary, a wettable powder particle size control method based on an air flow pulverizer first analyzes the uniformity of the equivalent particle size distribution at each sampling moment of each pulverizing monitoring position to determine the corresponding particle size uniformity; thereby comprehensively evaluating the corresponding material state value from the aspects of particle size uniformity and particle size; then, based on the size of the material state value relative to the prior standard state value and the prior standard pulverization gas pressure, the corresponding reference pulverization gas pressure is determined; further, the rotating speed adjustment factor of each pulverizing monitoring position is comprehensively determined by analyzing the three dimensions of the material state value, the average particle size and the reference pulverization gas pressure; thereby, the regulated classification impeller rotating speed of the outlet position of each pulverizing chamber is adaptively determined based on the rotating speed adjustment factor, so that the production effect of the wettable powder according to the regulated classification impeller rotating speed is better.

[0082] The application also provides a wettable powder particle size control system based on an air flow pulverizer, please refer to Figure 3 which shows the structure diagram of a wettable powder particle size control system based on an air flow pulverizer provided by an embodiment of the application, the system comprises: a data acquisition and preprocessing module 301, a first determination module 302, a second determination module 303 and a particle size control module 304.

[0083] The data acquisition and preprocessing module 301 is used to acquire the average particle size of the real-time material at each sampling moment of each pulverizing monitoring position in the air flow pulverizer; wherein all the pulverizing monitoring positions include the raw material inlet position, the outlet position of the pulverizing chamber and the outlet position of each classification wheel, and all the pulverizing monitoring positions are arranged in sequence according to the pulverizing order of the material;

[0084] The first determination module 302 is used to determine the corresponding particle size uniformity according to the equivalent particle size distribution of each pulverizing monitoring position at each sampling moment; determine the material state value of each pulverizing monitoring position according to the average particle size of each pulverizing monitoring position and the corresponding particle size uniformity; and determine the corresponding reference pulverization gas pressure according to the material state value of the outlet position of the pulverizing chamber combined with the prior standard state value and the prior standard pulverization gas pressure;

[0085] The second determining module 303 is configured to determine a rotating speed adjustment factor of each classification wheel outlet position according to the relative change of the reference pulverization air pressure, the change of the material state value between each classification wheel outlet position and the previous pulverization monitoring position, and the average particle size; and determine the regulated classification impeller rotating speed of each classification wheel outlet position at each sampling moment according to the rotating speed adjustment factor.

[0086] The particle size control module 304 is configured to perform the wettable powder particle size control according to the reference pulverization air pressure and the regulated classification impeller rotating speed.

[0087] It should be noted that the system provided in the above embodiments is only used as an example for the division of the above functional modules. In actual applications, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the computer device is divided into different functional modules to complete all or part of the above-described functions. In addition, the wettable powder particle size control system based on the jet mill and the wettable powder particle size control method based on the jet mill provided in the above embodiments belong to the same concept, and the specific implementation process is described in the method embodiments, which will not be described here.

[0088] The computer device provided in the above embodiments is described in detail as follows. Figure 4 The computer device includes a memory 401, a processor 402, and a computer program 403 stored in the memory 401 and running on the processor 402. When the processor 402 executes the computer program 403, the computer device can execute any one of the wettable powder particle size control methods based on the jet mill.

[0089] The computer program product provided in the above embodiments is described in detail as follows. When the computer program product runs on the computer device, the computer device can execute any one of the wettable powder particle size control methods based on the jet mill.

[0090] The computer readable storage medium provided in the above embodiments is described in detail as follows. The computer readable storage medium stores computer program code. When the computer program code runs on the computer device, the computer device can execute any one of the wettable powder particle size control methods based on the jet mill.

[0091] In the embodiments provided in the present application, it should be understood that the computer device, the computer program product, and the computer readable storage medium provided are all used to execute the corresponding method provided above, and thus the beneficial effects achieved can refer to the beneficial effects of the method provided above, which will not be described here.

[0092] It is to be noted that the sequential order of the above-described embodiments of the present application only for the purpose of description, but not the advantages and disadvantages of the embodiments. The processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multi-task processing and parallel processing are also possible or can be advantageous.

[0093] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the difference from other embodiments.

Claims

1. A method for controlling the particle size of a wettable powder based on an air jet mill, characterized by, The method comprises: acquiring the average particle size of the real-time material in each pulverization monitoring position of the airflow pulverizer at each sampling time; wherein all the pulverization monitoring positions include the raw material inlet position, the pulverization chamber outlet position, and each classification wheel outlet position, and all the pulverization monitoring positions are arranged in sequence according to the pulverization sequence of the material; at each sampling time, determining the corresponding particle size uniformity according to the equivalent particle size distribution of each pulverization monitoring position; determining the material state value of each pulverization monitoring position according to the average particle size and the corresponding particle size uniformity of each pulverization monitoring position; and determining the corresponding reference pulverization air pressure according to the material state value of the pulverization chamber outlet position in combination with the prior standard state value and the prior standard pulverization air pressure; determining the speed regulation factor of each classification wheel outlet position according to the relative change of the reference pulverization air pressure, the change of the material state value between each classification wheel outlet position and the previous pulverization monitoring position, and the average particle size; and determining the regulated classification impeller speed of each classification wheel outlet position at each sampling time according to the speed regulation factor; controlling the particle size of the wettable powder according to the reference pulverization air pressure and the regulated classification impeller speed; the acquisition process of the material state value comprises: at each sampling time, determining the corresponding material state value according to the product of the negative correlation mapping value of the average particle size of each pulverization monitoring position and the particle size uniformity; the acquisition process of the reference pulverization air pressure comprises: at each sampling time, determining the corresponding material state parameter according to the ratio between the prior standard material state value and the material state value of the pulverization chamber outlet position; taking the pulverization air pressure of the pulverization chamber at the previous sampling time of each sampling time as the corresponding comparative pulverization air pressure; and determining the reference pulverization air pressure of the pulverization chamber outlet position at each sampling time according to the product of the material state parameter and the comparative pulverization air pressure.

2. The method of claim 1, wherein the jet mill-based wettable powder particle size control method is characterized by, the acquisition process of the particle size uniformity comprises: acquiring the D10 data, D50 data, and D90 data of the real-time material of each pulverization monitoring position at each sampling time; and determining the particle size dispersion parameter according to the difference between the D90 data and the D10 data; determining the particle size uniformity of the real-time material of each pulverization monitoring position at each sampling time according to the relative size between the particle size dispersion parameter and the D50 data.

3. The method of claim 2, wherein the jet mill-based wettable powder particle size control method is characterized by, the process of determining the particle size uniformity of the real-time material of each pulverization monitoring position at each sampling time according to the relative size between the particle size dispersion parameter and the D50 data comprises: performing negative correlation mapping on the ratio between the particle size dispersion parameter and the D50 data to determine the particle size uniformity of the real-time material of each pulverization monitoring position at each sampling time.

4. The method of claim 1, wherein the jet mill-based wettable powder particle size control method is characterized by, the acquisition process of the speed regulation factor comprises: determining the material screening characteristic value according to the relative deviation between the average particle size of each classification wheel outlet position at each sampling time and the corresponding prior target particle size; and According to the reference crushing air pressure deviation and the material state value deviation between each classification wheel outlet position and the previous crushing monitoring position, a corresponding crushing change characteristic value is determined; According to the material screening characteristic value and the crushing change characteristic value, a speed adjustment factor of each classification wheel outlet position at each sampling time is determined.

5. The jet mill-based wettable powder particle size control method according to claim 4, characterized by, The acquisition process of the material screening characteristic value includes: At each sampling time, a difference between the average particle size of each classification wheel outlet position and the corresponding prior target particle size is taken as a reference screening degree; according to a ratio between the reference screening degree and the prior target particle size, a corresponding material screening characteristic value is determined.

6. The jet mill-based wettable powder particle size control method according to claim 4, characterized by, The acquisition process of the crushing change characteristic value includes: At each sampling time, a difference between the material state value of each classification wheel outlet position and the material state value of the previous crushing monitoring position is negatively correlated to map a corresponding screening effect characteristic value; According to a ratio between a reference crushing air pressure of the crushing chamber outlet position at each sampling time and a crushing air pressure at the previous sampling time, a corresponding air pressure influence value is determined; A product between the screening effect characteristic value and the air pressure influence value is normalized to determine a crushing change characteristic value of each classification wheel outlet position.

7. The jet mill-based wettable powder particle size control method according to claim 4, characterized by, The process of determining the speed adjustment factor of each classification wheel outlet position at each sampling time according to the material screening characteristic value and the crushing change characteristic value includes: A mean value between the material screening characteristic value and the crushing change characteristic value is positively correlated to map a speed adjustment factor of each classification wheel outlet position at each sampling time.

8. The method of claim 1, wherein the jet mill-based wettable powder particle size control method is characterized by, The acquisition process of the regulated classification impeller speed includes: At each sampling time, a product between a real-time classification impeller speed of the corresponding classification impeller of each classification wheel outlet position and the speed adjustment factor is determined as a corresponding regulated classification impeller speed.

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