A method and device for identifying and controlling a full-milling state of a vertical mill

Abstract

The application discloses a kind of identification and control method and device for vertical mill full-milling state, which comprises the following steps: obtaining mill vibration and mill internal pressure difference value in the process of mill operation;Grade assignment is carried out to the mill vibration and mill internal pressure difference value;According to the grade, full-milling state is identified and output is controlled.The application selects only two variables of mill vibration and mill internal pressure difference which are most obvious in full-milling state, and grade assignment is carried out to the two variables, to judge full-milling state and control output, to avoid the problem of parameter missing and lagging of judgment result caused by process change when determining full-milling state.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of industrial production, in particular to a method and device for identifying and controlling a full-milling state of a vertical mill. BACKGROUND

[0002] In the production process of a slag vertical mill, the abnormal working condition of "full-milling" is most likely to occur in order to maximize the output, which needs to be continuously monitored by an operator and timely adjusted, otherwise, the vibration will be stopped, or the equipment will be damaged.

[0003] The existing method for identifying the full-milling of the vertical mill production is to obtain the characteristics in the running process of the mill, based on the historical data of the characteristics and processed by a certain algorithm and strategy, to evaluate whether the mill is full-milling and the degree of full-milling. However, the historical data of some characteristics are difficult to directly obtain, and the process needs to be stable, when the process changes, the moisture of the material changes, and the auxiliary material changes, the reference value of the long-term data is not large, and even affects the accuracy of the judgment result, and the full-milling trend cannot be judged, which will lead to the lag of the judgment result and affect the stability of the closed-loop control system. SUMMARY

[0004] In view of the problems in the prior art, the present application provides a method and device for identifying and controlling the full-milling state of a vertical mill, which selects two variables of mill vibration and internal pressure difference of the mill which are most obvious in full-milling, to avoid the problems of parameter missing and lag of the judgment result caused by process changes when determining the full-milling state.

[0005] To achieve the above-mentioned purpose, the present application provides a method for identifying and controlling the full-milling state of a vertical mill, comprising the following steps:

[0006] obtaining the values of mill vibration and internal pressure difference of the mill in the running process of the mill;

[0007] grading the values of mill vibration and internal pressure difference of the mill;

[0008] identifying the full-milling state and controlling the output according to the grades.

[0009] Among them:

[0010] When the grade of the mill vibration is large, the grade of the internal pressure difference of the mill is judged, and when the grade of the internal pressure difference of the mill is large, the full-milling state is identified, otherwise, the vibration caused by non-full-milling, when the grade of the internal pressure difference of the mill rises obviously, the first output is reduced;

[0011] When the grade of the internal pressure difference of the mill is large, when the grade of the mill vibration remains unchanged or rises, the full-milling state is identified, otherwise, it is a non-full-milling state;

[0012] When the level of the mill vibration and the level of the mill internal pressure difference fall back simultaneously, it is identified that the mill is recovered from the full-mill state to the non-full-mill state, and the first output quantity and the second output quantity are increased.

[0013] The output includes the first output quantity and the second output quantity.

[0014] The level assignment of the mill vibration and the mill internal pressure difference value further includes a mill vibration comprehensive level determining step and a mill internal pressure difference comprehensive level determining step, wherein: the mill vibration comprehensive level determining step is used for determining the mill vibration comprehensive level according to an absolute vibration level, a relative vibration level and a comprehensive vibration slope level; and the mill internal pressure difference comprehensive level determining step is used for determining the mill internal pressure difference comprehensive level according to an absolute pressure difference level, a relative pressure difference level and a comprehensive pressure difference slope level.

[0015] The mill vibration comprehensive level determining step further includes an absolute vibration level determining step, which includes: selecting an average value of a plurality of maximum point vibration values in a first time period as an absolute vibration value; and determining the absolute vibration level according to the absolute vibration value, wherein the greater the absolute vibration value is, the higher the corresponding absolute vibration level is.

[0016] The mill vibration comprehensive level determining step further includes a relative vibration level determining step, which includes: taking a ratio of the absolute vibration value in the first time period to an average value of all vibration values as a relative vibration value; and determining the relative vibration level according to the relative vibration value, wherein the greater the relative vibration value is, the higher the corresponding relative vibration level is.

[0017] The mill vibration comprehensive level determining step further includes a comprehensive vibration slope level determining step, which includes: calculating a plurality of vibration slopes in a second time period, the plurality of vibration slopes including a long-term slope, a medium-term slope and a short-term slope; determining a vibration slope level of each of the vibration slopes according to each of the vibration slopes; and determining the comprehensive vibration slope level by comprehensively determining all of the vibration slope levels.

[0018] The mill internal pressure difference comprehensive level determining step further includes an absolute pressure difference level determining step, which includes: taking an average value of the mill internal pressure difference in a first time period as an absolute pressure difference value; and determining the absolute pressure difference level according to the absolute pressure difference value, wherein the greater the absolute pressure difference value is, the higher the corresponding absolute pressure difference level is.

[0019] The determining the comprehensive differential pressure grade step further comprises a determining a relative differential pressure grade step, comprising: taking a ratio of the absolute differential pressure value to an average value of the differential pressure in the mill in a third time period as a relative differential pressure value, the third time period being longer than the first time period; and determining the relative differential pressure grade according to the relative differential pressure value, wherein the greater the relative differential pressure value is, the higher the corresponding relative differential pressure grade is.

[0020] The determining the comprehensive differential pressure grade step further comprises a determining a comprehensive differential pressure slope grade step, comprising: calculating a plurality of differential pressure slopes in a second time period, the plurality of differential pressure slopes comprising a long-term slope, a medium-term slope and a short-term slope; determining a differential pressure slope grade for each of the plurality of differential pressure slopes respectively according to each of the differential pressure slopes; and determining the comprehensive differential pressure slope grade by synthesizing all of the differential pressure slope grades.

[0021] The first output quantity is the speed of the powder classifier, and the second output quantity is the feeding amount.

[0022] In another aspect, the application further provides a device for identifying and controlling the full-milling state of a vertical mill, comprising a processor configured to execute the following program modules stored in a memory:

[0023] A collecting module configured to acquire the values of the mill vibration and the differential pressure in the mill during the operation of the mill;

[0024] A calculating grade module configured to assign grades to the values of the mill vibration and the differential pressure in the mill;

[0025] An identifying and controlling module configured to identify the full-milling state and control the output according to the grades.

[0026] The calculating grade module comprises a determining a mill vibration comprehensive grade module and a determining a differential pressure comprehensive grade module, wherein: the determining a mill vibration comprehensive grade module is configured to determine the mill vibration comprehensive grade according to the absolute vibration grade, the relative vibration grade and the comprehensive vibration slope grade; and the determining a differential pressure comprehensive grade module is configured to determine the differential pressure comprehensive grade according to the absolute differential pressure grade, the relative differential pressure grade and the comprehensive differential pressure slope grade.

[0027] The determining a mill vibration comprehensive grade module further comprises a determining an absolute vibration grade module, configured to: take an average value of a plurality of highest point vibration values in a first time period as an absolute vibration value; and determine the absolute vibration grade according to the absolute vibration value, wherein the greater the absolute vibration value is, the higher the corresponding absolute vibration grade is.

[0028] The determining mill vibration comprehensive grade module further comprises a determining relative vibration grade module, configured to: take a ratio of the absolute vibration value in the first time period to an average value of all vibration values as a relative vibration value; and determine the relative vibration grade according to the relative vibration value, wherein the greater the relative vibration value is, the higher the corresponding relative vibration grade is.

[0029] The determining mill vibration comprehensive grade module further comprises a determining relative vibration grade module, configured to: take a ratio of the absolute vibration value in the first time period to an average value of all vibration values as a relative vibration value; and determine the relative vibration grade according to the relative vibration value, wherein the greater the relative vibration value is, the higher the corresponding relative vibration grade is.

[0030] The determining mill vibration comprehensive grade module further comprises a determining relative vibration grade module, configured to: take a ratio of the absolute vibration value in the first time period to an average value of all vibration values as a relative vibration value; and determine the relative vibration grade according to the relative vibration value, wherein the greater the relative vibration value is, the higher the corresponding relative vibration grade is.

[0031] The determining mill vibration comprehensive grade module further comprises a determining relative vibration grade module, configured to: take a ratio of the absolute vibration value in the first time period to an average value of all vibration values as a relative vibration value; and determine the relative vibration grade according to the relative vibration value, wherein the greater the relative vibration value is, the higher the corresponding relative vibration grade is.

[0032] The determining mill vibration comprehensive grade module further comprises a determining relative vibration grade module, configured to: take a ratio of the absolute vibration value in the first time period to an average value of all vibration values as a relative vibration value; and determine the relative vibration grade according to the relative vibration value, wherein the greater the relative vibration value is, the higher the corresponding relative vibration grade is.

[0033] The determining mill vibration comprehensive grade module further comprises a determining relative vibration grade module, configured to: take a ratio of the absolute vibration value in the first time period to an average value of all vibration values as a relative vibration value; and determine the relative vibration grade according to the relative vibration value, wherein the greater the relative vibration value is, the higher the corresponding relative vibration grade is.

[0034] In another aspect, the application further provides a computer readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the identification and control method of the full-mill state of the vertical mill.

[0035] As can be seen from the above solutions, the application has the following advantages:

[0036] The application determines the full-mill state and controls the output by selecting only two variables, i.e., the mill vibration and the mill internal pressure difference, which are most obvious in the full-mill state, and assigning grades to the two variables, thereby avoiding the problem that the algorithm parameters cannot be adapted due to lack of parameters.

[0037] The threshold or historical value of the mill vibration and the pressure difference in the mill of the application is not limited to the collected parameters themselves, but more to other features of the two parameters, such as absolute vibration, relative vibration, vibration slope, absolute pressure difference, relative pressure difference, and pressure difference slope, to comprehensively construct an evaluation model of vibration and pressure difference, and to improve the accuracy of the full-mill state judgment and the stability of the output control. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 The flowchart of the full-mill state recognition and control method of the application;

[0039] Figures 2 to 4C The flowchart of part of the steps; Figure 1

[0040] Figure 5 The flowchart of the specific application scenario of the application;

[0041] Figure 6 The structural schematic diagram of the full-mill state recognition and control device of the application;

[0042] Figures 7 to 9 The structural schematic diagram of part of the modules; Figure 6

[0043] Among them, the reference signs:

[0044] 1- full-mill state recognition and control method;

[0045] 2- full-mill state recognition and control device;

[0046] 20- processor;

[0047] 21- memory;

[0048] 22- collection module;

[0049] 23- calculation level module;

[0050] 230- mill vibration comprehensive level determination module;

[0051] 230a- absolute vibration level determination module;

[0052] 230b- relative vibration level determination module;

[0053] 230c- comprehensive vibration slope level determination module;

[0054] 231- mill pressure difference comprehensive level determination module;

[0055] 231a- absolute pressure difference level determination module;

[0056] ​​231b - determining relative differential pressure level module;

[0057] 231c - determining integrated differential pressure slope level module;

[0058] 24 - identifying control module. DETAILED DESCRIPTION

[0059] The technical solutions of the present application will be described in detail below with reference to the drawings and specific embodiments, so as to further understand the purposes, solutions and effects of the present application, but not as a limitation on the protection scope of the appended claims of the present application.

[0060] In the description, the references to "an embodiment", "another embodiment", "this embodiment" and the like mean that the described embodiment can include a particular feature, structure or characteristic, but every embodiment need not necessarily include the particular feature, structure or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of those skilled in the art to effect such feature, structure or characteristic in connection with other embodiments whether or not explicit reference to the other embodiments is made.

[0061] In the description and claims of the application, each of the words "comprise" and "comprising" and the like are to be understood within the context as providing an open limit that does not exclude the addition of extra features, steps, components, compositions, integers, steps, processes, operations, elements, etc.

[0062] It should be noted that in the description of the present application, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and "about" or "approximately", "substantially", "left and right" and the like indicating the orientation or positional relationship or parameters and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description content, and do not indicate or imply that the devices or elements referred to must have a particular orientation, a particular size or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0063] In the prior art, when using the mill differential pressure to represent the full-milling state, the mill differential pressure is usually controlled at a constant level, but the control target of the mill differential pressure is different in the process condition, the material condition, the front, middle and rear stages of the mill lining, and even if all the working conditions are similar, the vibration of the mill is different at the same mill differential pressure level, so the target differential pressure needs to be frequently modified manually, and it is difficult to improve the automation level.

[0064] The vibration control is also a big difficulty in the mill control, and the full-milling is one of the main factors causing the mill vibration. However, in the later stage of the mill, the vibration is usually large, and only relying on the threshold control or taking the threshold as the main characteristic value will cause frequent "wind drawing", which greatly affects the product quality.

[0065] The embodiment of the present application provides a kind of full-milling state identification and control method of vertical mill, overcome the process condition, material condition or the parameter of mill lining in front, middle and rear stage different, it is difficult to accurately determine the characteristic parameter and cause the problem of difficult to determine full-milling state.

[0066] The technical scheme of the present application is to solve the above problems, the general idea is as follows, only select the two variables of full-milling, mill vibration and mill internal differential pressure, and the threshold or historical value of mill vibration and mill internal differential pressure is not limited to the collection parameter itself, more is the other characteristics of the two parameters, and the evaluation model of vibration and differential pressure is constructed.

[0067] Figure 1 The flow chart of a kind of full-milling state identification and control method 1 (hereinafter referred to as method 1) provided by the embodiment of the present application, the method 1 includes the following steps:

[0068] S10: obtaining mill vibration and mill internal differential pressure value in the process of mill running;

[0069] S20: grade assignment is carried out to the mill vibration and mill internal differential pressure value;

[0070] S30: according to the grade, full-milling state is identified and control output.

[0071] In the embodiment, as shown in the figure, Figure 2 Step S20 further includes:

[0072] S200: determine mill vibration comprehensive grade step, for determining the mill vibration comprehensive grade according to absolute vibration grade, relative vibration grade and comprehensive vibration slope grade

[0073] S210: determine mill internal differential pressure comprehensive grade step, for determining the mill internal differential pressure comprehensive grade according to absolute differential pressure grade, relative differential pressure grade and comprehensive differential pressure slope grade.

[0074] As shown in the figure, Figure 3As shown, step S200 further comprises: S201: determining an absolute vibration level step, as shown in Figure 3A As shown, step S200 further comprises: S201: determining an absolute vibration level step, as shown in

[0075] S2010: selecting an average value of a plurality of maximum point vibration values in a first time period as an absolute vibration value;

[0076] S2011: determining the absolute vibration level according to the absolute vibration value, wherein the greater the absolute vibration value, the higher the corresponding absolute vibration level.

[0077] Step S200 further comprises: S202: determining a relative vibration level step, as shown in Figure 3B As shown, step S200 further comprises: S201: determining an absolute vibration level step, as shown in

[0078] S2020: taking a ratio of the absolute vibration value in the first time period to an average value of all vibration values as a relative vibration value;

[0079] S2021: determining the relative vibration level according to the relative vibration value, wherein the greater the relative vibration value, the higher the corresponding relative vibration level.

[0080] Step S200 further comprises: S203: determining a comprehensive vibration slope level step, as shown in Figure 3C As shown, step S200 further comprises: S201: determining an absolute vibration level step, as shown in

[0081] S2030: calculating a plurality of vibration slopes in a second time period, the plurality of vibration slopes including a long-term slope, a medium-term slope and a short-term slope;

[0082] S2031: determining each vibration slope level according to each of the vibration slopes;

[0083] S2032: comprehensively determining the comprehensive vibration slope level according to all of the each vibration slope levels.

[0084] In this embodiment, as shown in Figure 4 Step S210 further comprises: S211: determining an absolute pressure difference level step, as shown in Figure 4A As shown, step S210 further comprises: S211: determining an absolute pressure difference level step, as shown in

[0085] S2111: determining the absolute pressure difference level according to the absolute pressure difference value, wherein the greater the absolute pressure difference value, the higher the corresponding absolute pressure difference level.

[0086] Step S210 further comprises: S212: determining a relative pressure difference level step, as shown in Figure 4B As shown, step S210 further comprises: S211: determining an absolute pressure difference level step, as shown in

[0087] S2120: taking the ratio of the absolute pressure difference value and the average value of the internal mill pressure difference in a third time period as a relative pressure difference value, the third time being greater than the first time;

[0088] S2121: determining the relative pressure difference level according to the relative pressure difference value, wherein the greater the relative pressure difference value is, the higher the corresponding relative pressure difference level is.

[0089] Step S210 further comprises: S213: determining a comprehensive pressure difference slope level step, as shown in the table: Figure 4C

[0090] S2130: calculating a plurality of pressure difference slopes in a second time period, the plurality of pressure difference slopes comprising a long-term slope, a medium-term slope and a short-term slope;

[0091] S2131: determining a pressure difference slope level for each of the pressure difference slopes respectively according to each of the pressure difference slopes;

[0092] S2132: determining the comprehensive pressure difference slope level by comprehensively determining all of the pressure difference slope levels.

[0093] In the embodiment, the output in step S30 comprises a first output quantity, such as the speed of the powder classifier, and a second output quantity, such as the feeding amount.

[0094] In order to facilitate understanding of the above embodiment, a specific application scenario of the above embodiment will be described below, as shown in the table: Figure 5

[0095] In step S10, the raw values of the mill vibration and the internal mill pressure difference of the vertical mill can be obtained from a PLC or other sources, and the sampling period is set to 1 second.

[0096] In step S20, the mill vibration is first subjected to preliminary data processing:

[0097] Step S2010 specifically calculates the absolute vibration value: considering the instability of the vibration factor, the average value is easy to cover the abnormal vibration point, and the maximum value is easy to be disturbed, and it is appropriate to select the average value of the vibration values of the highest 3 points in 1 min (i.e. the first time period) as the absolute vibration value.

[0098] Step S2020 specifically calculates the relative vibration value: the absolute vibration value in 1 min divided by the average value in 1 min is the relative vibration value.

[0099] Step S2030 comprises calculating the vibration slope: in order to judge the growth trend of the vibration, the slope of each stage in a relatively long time (i.e. the second time period, for example 8-30 min) is selected to judge the trend change of the vibration.

[0100] ​​Step S203 includes data processing of the mill vibration slope, considering the full-mill occurrence judgment and the full-mill recovery judgment, only one vibration slope is difficult to represent the vibration trend of the mill, so multiple vibration slopes are calculated, as follows:

[0101] The long-term slope is calculated, which mainly extracts the slow full-mill state, such as the vibration slope within 8 minutes.

[0102] The medium-term slope is calculated, which mainly extracts the relatively fast full-mill state, such as the vibration slope within 4 minutes.

[0103] The short-term slope is calculated, which mainly judges the recent trend and whether the inflection point has arrived, such as the vibration slope within 2 minutes.

[0104] Vibration level assignment, according to the fuzzy control concept, the specific numerical value is fuzzified

[0105] to different levels, where the level is defined as XS(--), S(-), MN(0-), M(0), MP(0+), L(+), XL(++) level, which can be freely expanded.

[0106] In step S2011, the absolute vibration level is determined according to Table 1.

[0107] Table 1 Absolute vibration level table

[0108] Value <＝5.8 <＝6 <＝9 <＝10 <＝11.5 <＝12.5 >12.5 Grade S MN MP L XL XXL XXXL

[0109] In step 2021, the relative vibration level is determined according to Table 2.

[0110] Table 2 Relative vibration level table

[0111] Value 1.4 1.5 1.6 1.8 2 >2 Grade XS S M L XL XXL

[0112] In step 2131, each item of vibration slope is determined according to Table 3.

[0113] Table 3 Vibration slope level table

[0114] Value -1 -0.5 0 0.7 1.1 1.5 >1.5 Grade XS S MN MP L XL XXL

[0115] In step S2132, the vibration slope level judgment is integrated, for the convenience of subsequent calculation, by integrating the long-term, medium-term and short-term levels, according to Table 4, the integrated vibration slope level is judged.

[0116] Table 4 Integrated vibration slope level table

[0117] XXXL >＝L >＝L XXXXL >＝L Long term >＝L … <L <＝S >= XL >＝M >＝L >＝M >= XXL >＝M Medium term … <M <M >= XL >＝M >＝M >＝M >＝M >＝M >＝M … <M <M >= XXL L L Short term Result XL XL … S XXL

[0118] Note: In Table 4, when the integrated judgment is greater than M, take the maximum value, and less than M, take the minimum value.

[0119] In step S200, the mill vibration comprehensive level is determined according to Table 5

[0120] Table 5 Mill vibration comprehensive level table

[0121] XXL >＝M >＝M >＝M >＝M >＝M >＝M … <= MP <XXXL XS >＝L Absolute Relative >＝L >= XXL >= XXL … <＝M <＝S >= XL >＝L >＝L >= XXL Slope >= XL >= XL … <＝S <= XS >= XXL L >= MP Result XL XXL L … S XL

[0122] The judgment logic of the mill internal pressure difference comprehensive level is similar to that of the mill vibration comprehensive level, and the specific values and matters needing attention are as follows:

[0123] In step S2110, the absolute pressure difference is calculated: since the pressure difference change is a gentle change variable, the absolute pressure difference is directly taken as the average value in 1 min as the absolute pressure difference value.

[0124] In step S2111, the absolute pressure difference level is determined according to Table 6.

[0125] Table 6 Absolute pressure difference level table

[0126] XXL <＝25 <＝27 <＝28 <＝28.5 <＝29 <＝30 <＝31 ＞31 XS S Value Grade L MN MP XL XXL

[0127] It should be noted that in the position sensitive to pressure difference change, such as the position determined in the above table L, the interval can be refined for accurate control.

[0128] In step S2120, the relative pressure difference is calculated: the absolute pressure difference value is divided by the average value of 30 min (i.e. the third time period) as the relative pressure difference value.

[0129] In step S2121, the relative pressure difference level is determined according to Table 7.

[0130] Table 7 Relative pressure difference level table

[0131] XXXL <＝0.9 <＝1 <＝1.05 <＝1.1 <＝1.2 ＞1.2 XXXL Value S M L Grade XS

[0132] The pressure difference slope is also divided into long-term pressure difference slope, medium-term pressure difference slope and short-term pressure difference slope. Considering that the pressure difference changes slower than vibration, the time defined for long-term, medium-term and short-term needs to be extended. For example, the long-term pressure difference slope is taken for 15 min, the medium-term slope is taken for 8 min, and the short-term slope is taken for 4 min.

[0133] In step S2131, each item (including long-term, medium-term and short-term) pressure difference slope level is determined according to Table 8.

[0134] Table 8 Pressure difference slope level table

[0135] XL <＝-0.6 <＝-0.3 <＝0.1 <＝0.2 <＝0.6 <＝1.2 <＝2 <＝3 <＝4 ＞4 XXL Value S Grade M XS L MN MP XL XXL

[0136] Since the pressure difference slope is divided into 3 slopes, in order to reduce the dimension of calculation, it is necessary to combine the 3 pressure difference slope levels into one comprehensive pressure difference slope level. The combination logic is as follows in Table 9.

[0137] Table 9 Comprehensive differential pressure slope grade table

[0138] XXXL >＝L >＝M XXXXL >＝M Long term >＝S … <= XL <＝S <= XXXXL <= XXXXL … >= XL >M >＝L >M >= XXL >＝M Medium term … <M <M <＝M <＝S … >= XL >M >M >M >M >M >M … <M <M <M <M … >= XXL L L Short term Result XL XL … S XXL S XXL …

[0139] Also based on the idea of dimension reduction, the absolute differential pressure grade, the relative differential pressure grade, and the comprehensive differential pressure slope grade are combined into the comprehensive differential pressure grade in the mill based on the saturation rule, as shown in Table 10.

[0140] Table 10 Comprehensive differential pressure grade table in the mill

[0141]

[0142]

[0143] Finally, according to the comprehensive mill vibration grade and the comprehensive differential pressure grade in the mill, the saturation state is determined, and the adjustment of the feed amount and the speed of the powder classifier is controlled according to Table 11, forming a closed-loop control.

[0144] Table 11

[0145]

[0146] Note: The default is the normal state (M), and when the comprehensive mill vibration grade and the comprehensive differential pressure grade in the mill are met, other states are identified.

[0147] The principle of judging the saturation state by the comprehensive mill vibration grade and the comprehensive differential pressure grade in the mill is:

[0148] 1. When the comprehensive mill vibration grade is large, it needs to be combined with the comprehensive differential pressure grade in the mill to determine that when the comprehensive differential pressure grade in the mill is large, it is identified as saturation. Otherwise, the vibration is caused by non-saturation. When the comprehensive differential pressure grade in the mill rises significantly, the speed of the powder classifier needs to be reduced (i.e., the first output).

[0149] 2. When the comprehensive differential pressure grade in the mill is large, the comprehensive mill vibration grade remains unchanged or rises, which is considered as the saturation state, and the saturation grade is positively correlated with the comprehensive mill vibration grade and the comprehensive differential pressure grade in the mill.

[0150] 3. Saturation recovery (under-grinding) judgment: saturation recovery requires the comprehensive mill vibration grade and the comprehensive differential pressure grade in the mill to fall simultaneously, which is considered as the non-saturation (under-grinding) state, and the feed amount (i.e., the second output) and the speed of the powder classifier can be increased.

[0151] In the saturation identification result, the grade greater than or equal to L is saturation, and the higher the grade, the more serious the saturation. The grade less than or equal to S is the under-grinding state, and the lower the grade, the more serious the under-grinding. When the identification result is M, it is the normal state, and no intervention adjustment is needed.

[0152] The following is a device embodiment corresponding to the above method embodiment. The present embodiment can be implemented in cooperation with the above embodiments. The related technical details mentioned in the above embodiments are still valid in the present embodiment. In order to reduce repetition, they will not be described here. Correspondingly, the related technical details mentioned in the present embodiment can also be applied in the above embodiments.

[0153] As shown in XS Another embodiment of the present application provides a structure diagram of a recognition and control device 2 for a full-milling state of a vertical mill (hereinafter referred to as device 2). The device 2 comprises a processor 20 for executing the following program modules stored in a memory 21:

[0154] A collection module 22 is configured to acquire the values of the mill vibration and the internal pressure difference of the mill during the operation of the mill.

[0155] A calculation level module 23 is configured to assign levels to the values of the mill vibration and the internal pressure difference of the mill.

[0156] A recognition and control module 24 is configured to recognize the full-milling state and control the output according to the levels.

[0157] In the present embodiment, as shown in XS The calculation level module 23 comprises a determination of the comprehensive level of the mill vibration module 230 and a determination of the comprehensive level of the internal pressure difference module 231. The determination of the comprehensive level of the mill vibration module 230 is configured to determine the comprehensive level of the mill vibration according to the absolute vibration level, the relative vibration level, and the comprehensive vibration slope level. The determination of the comprehensive level of the internal pressure difference module 231 is configured to determine the comprehensive level of the internal pressure difference according to the absolute pressure difference level, the relative pressure difference level, and the comprehensive pressure difference slope level.

[0158] As shown in Figure 6 The determination of the comprehensive level of the mill vibration module 230 further comprises a determination of the absolute vibration level module 230a. The determination of the absolute vibration level module 230a is configured to select the average value of the maximum vibration values in the first time period as the absolute vibration value, and determine the absolute vibration level according to the absolute vibration value. The greater the absolute vibration value, the higher the corresponding absolute vibration level.

[0159] The determination of the comprehensive level of the mill vibration module 230 further comprises a determination of the relative vibration level module 230b. The determination of the relative vibration level module 230b is configured to take the ratio of the absolute vibration value in the first time period to the average value of all vibration values as the relative vibration value, and determine the relative vibration level according to the relative vibration value. The greater the relative vibration value, the higher the corresponding relative vibration level.

[0160] The determining mill vibration comprehensive grade module 230 further comprises a determining comprehensive vibration slope grade module 230c, configured to: calculate a plurality of vibration slopes in a second time period, the plurality of vibration slopes comprising a long-term slope, a medium-term slope and a short-term slope; determine a vibration slope grade for each of the vibration slopes respectively according to each of the vibration slopes; and determine the comprehensive vibration slope grade by comprehensively determining all of the vibration slope grades.

[0161] As shown in Figure 7 The determining mill internal pressure difference comprehensive grade module 231 further comprises a determining absolute pressure difference grade module 231a, configured to: take an average value of the mill internal pressure difference in a first time period as an absolute pressure difference value; and determine the absolute pressure difference grade according to the absolute pressure difference value, wherein the greater the absolute pressure difference value, the higher the corresponding absolute pressure difference grade.

[0162] The determining mill internal pressure difference comprehensive grade module 231 further comprises a determining relative pressure difference grade module 231b, configured to: take a ratio of the absolute pressure difference value to an average value of the mill internal pressure difference in a third time period as a relative pressure difference value, the third time period being greater than the first time period; and determine the relative pressure difference grade according to the relative pressure difference value, wherein the greater the relative pressure difference value, the higher the corresponding relative pressure difference grade.

[0163] The determining mill internal pressure difference comprehensive grade module 231 further comprises a determining comprehensive pressure difference slope grade module 231c, configured to: calculate a plurality of pressure difference slopes in a second time period, the plurality of pressure difference slopes comprising a long-term slope, a medium-term slope and a short-term slope; determine a pressure difference slope grade for each of the pressure difference slopes respectively according to each of the pressure difference slopes; and determine the comprehensive pressure difference slope grade by comprehensively determining all of the pressure difference slope grades.

[0164] In another aspect, the embodiment of the present application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement steps of the method for identifying and controlling the full-mill state of the vertical mill, such as Figure 8 Figure 9 Figures 1 to 5 steps shown in the above.

[0165] It should be appreciated that the computer-readable storage medium in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically EPROM (EEPROM) or a flash memory. The volatile memory can be a random access memory (RAM) used as an external cache. By way of example but not limitation, many forms of random access memory (RAM) are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM) and direct RAMBUS (DRAM).

[0166] In summary, the present application selects only the two most obvious variables of mill vibration and mill pressure difference, and the threshold or historical value of mill vibration and mill pressure difference is not limited to the collected parameters themselves, but more to other characteristics of the two parameters, and the evaluation model of vibration and pressure difference is constructed comprehensively, which avoids the problem that the algorithm parameters cannot be adapted due to the lack of parameters, and improves the accuracy of the full-mill state judgment and the stability of the output control.

[0167] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above specific embodiments, and the above specific embodiments are only illustrative but not limiting, and those skilled in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, which all belong to the protection scope of the present application.

Claims

1. A method for identifying and controlling the full-grind state of a vertical mill, characterized in that, Includes the following steps: Obtain mill vibration and internal pressure differential values ​​during mill operation; Assigning grades to the mill vibration and internal pressure difference values; including: determining the overall grade of mill vibration and determining the overall grade of internal pressure difference, wherein: The step of determining the overall vibration level of the mill is used to determine the overall vibration level of the mill based on the absolute vibration level, the relative vibration level, and the overall vibration slope level; the step of determining the overall vibration level of the mill includes: The step of determining the absolute vibration level includes: selecting the average of the vibration values ​​at multiple highest points within a first time period as the absolute vibration value; determining the absolute vibration level based on the absolute vibration value; and, The step of determining the relative vibration level includes: taking the ratio of the absolute vibration value to the average of all vibration values ​​within the first time period as the relative vibration value; determining the relative vibration level based on the relative vibration value; and, The step of determining the comprehensive vibration slope level includes: calculating multiple vibration slopes within a second time period, wherein the multiple vibration slopes include long-term slope, medium-term slope and short-term slope; determining the vibration slope level for each vibration slope separately; and combining all the vibration slope levels to determine the comprehensive vibration slope level. The step of determining the overall pressure difference level inside the mill is used to determine the overall pressure difference level inside the mill based on the absolute pressure difference level, the relative pressure difference level, and the overall pressure difference slope level; the step of determining the overall pressure difference level inside the mill includes: The step of determining the absolute pressure difference level includes: taking the average value of the internal pressure difference within a first time period as the absolute pressure difference value; determining the absolute pressure difference level based on the absolute pressure difference value; and, The step of determining the relative pressure difference level includes: using the ratio of the absolute pressure difference value to the average value of the internal pressure difference during a third time period as the relative pressure difference value, wherein the third time period is greater than the first time period; determining the relative pressure difference level based on the relative pressure difference value; and, The step of determining the overall differential pressure slope level includes: calculating multiple differential pressure slopes within a second time period, wherein the multiple differential pressure slopes include long-term slope, medium-term slope, and short-term slope; determining the level of each differential pressure slope based on each of the differential pressure slopes; and combining all the levels of each differential pressure slope to determine the overall differential pressure slope level. The wear state is identified based on the aforementioned level, and the output is controlled accordingly.

2. The method according to claim 1, characterized in that, The larger the absolute vibration value, the higher the corresponding absolute vibration level.

3. The method according to claim 1, characterized in that, The larger the relative vibration value, the higher the corresponding relative vibration level.

4. The method according to claim 1, characterized in that, The larger the absolute pressure difference value, the higher the corresponding absolute pressure difference level.

5. The method according to claim 1, characterized in that, The larger the relative pressure difference value, the higher the corresponding relative pressure difference level.

6. A device for identifying and controlling the full-grind state of a vertical mill, characterized in that, Includes a processor that, when executed, implements the steps of the method as described in any one of claims 1 to 5, and the processor is configured to execute the following program modules stored in memory: The data acquisition module is used to obtain the values ​​of mill vibration and internal pressure difference during mill operation; The calculation level module is used to assign level values ​​to the mill vibration and internal pressure difference values; The identification and control module is used to identify the wear state based on the level and control the output.

7. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1 to 5.

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