Control method and system for composite mineral admixture ball mill

Abstract

The invention relates to the technical field of ball mill control, and provides a composite mineral admixture ball mill control method and system.The method comprises the steps that driving current data, magic sound data and vibration data are collected, and a current sequence, a magic sound sequence and a vibration sequence of a collection period are constructed; marking a target acquisition period, determining a magic sound first slope, a magic sound wear confidence coefficient, a current first slope, a current wear confidence coefficient, a vibration first slope and a vibration wear confidence coefficient of the target acquisition period, and determining a steel ball wear coefficient of the target acquisition period; determining a wear difference coefficient of the target acquisition period; and according to the wear difference coefficient and the rotation speed rate of the target collection period, rotation speed rate control over the ball mill of the composite mineral admixture is achieved. According to the invention, self-adaptive control of the rotating speed rate of the ball mill for the composite mineral admixture can be realized.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of ball mill control, in particular to a composite mineral admixture ball mill control method and system. BACKGROUND

[0002] The ball mill can finely grind the ultra-fine composite mineral admixture after adding balls, can realize the ultra-fining and uniformization of particle size, improve the activity and reactivity of the mineral admixture, optimize the particle morphology and grading, and promote the resource utilization of solid waste. Precise regulation and control of the ball-to-material ratio and the rotation rate of the fine grinding process of the ball mill can improve the production efficiency and ensure the stability of the product quality.

[0003] When the ball mill grinds the ultra-fine size composite mineral admixture, the mineral admixture ratio is fixed, therefore, the rotation rate and the ball-to-material ratio are generally set as fixed parameters during grinding. However, the steel balls are continuously consumed during the grinding process, and the ball-to-material ratio in the ball mill also dynamically fluctuates with the consumption of the steel balls. At this time, if the fixed rotation rate is still used, the grinding quality and efficiency of the ball mill will be affected, and the product quality stability will be affected. SUMMARY

[0004] The application provides a composite mineral admixture ball mill control method and system to solve the problem that the fixed rotation rate does not match the gradual consumption of steel balls during the fine grinding process of the ball mill, affecting the quality of the grinding product. The technical scheme adopted is as follows:

[0005] In a first aspect, one embodiment of the application provides a composite mineral admixture ball mill control method, which comprises the following steps:

[0006] Collecting driving current data, magic sound data and vibration data at different collection time points in different collection periods to construct current sequence, magic sound sequence and vibration sequence of each collection period;

[0007] Any one collection period is recorded as a target collection period, the magic sound first slope and the magic sound wear confidence of the target collection period are determined according to the change trend of the magic sound data in the magic sound sequence of the target collection period and the difference between the magic sound sequences of the target collection period and the previous adjacent collection period, the current first slope, the current wear confidence, the vibration first slope and the vibration wear confidence of the target collection period are determined according to the current sequence and the vibration sequence of the target collection period respectively, and the steel ball wear coefficient of the target collection period is determined in combination with the magic sound first slope and the magic sound wear confidence and the change trend of the vibration data in the vibration sequence of the target collection period;

[0008] According to the difference between the target acquisition cycle and the first acquisition cycle, the difference between the current sequence, the difference between the magic sound sequence and the vibration sequence, and the difference between the steel ball wear coefficient of the target acquisition cycle and the first acquisition cycle, the wear difference coefficient of the target acquisition cycle is determined;

[0009] According to the wear difference coefficient of the target acquisition cycle and the rotation rate, the rotation rate control of the ball mill of the composite mineral admixture is realized.

[0010] Further, the determination method of the magic sound first slope is:

[0011] The slope of the fitting straight line is recorded as the magic sound first slope of the target acquisition cycle.

[0012] Further, the determination method of the magic sound wear confidence is:

[0013] The exponential value of the magic sound first slope of the target acquisition cycle is taken as the base of the natural constant, and the reciprocal of the calculated value of the exponential function is recorded as the magic sound first exponential value of the target acquisition cycle.

[0014] According to the difference between the magic sound sequence of the target acquisition cycle and the previous adjacent acquisition cycle, the magic sound first ratio of the target acquisition cycle is determined.

[0015] The positive correlation processing result of the magic sound first ratio and the magic sound first exponential value of the target acquisition cycle is recorded as the magic sound wear confidence of the target acquisition cycle.

[0016] Further, the determination method of the magic sound first ratio of the target acquisition cycle is:

[0017] The ratio of the mean value of the magic sound data contained in the magic sound sequence of the target acquisition cycle and the previous adjacent acquisition cycle is recorded as the magic sound first ratio of the target acquisition cycle.

[0018] Further, the specific method for determining the steel ball wear coefficient of the target acquisition cycle by combining the magic sound first slope and the magic sound wear confidence, and the change trend of the vibration data in the vibration sequence of the target acquisition cycle is:

[0019] The number of values of the magic sound first slope, the current first slope and the vibration first slope that take negative values is recorded as the number of decreases of the target acquisition cycle.

[0020] The mean value of the magic sound wear confidence, the current wear confidence and the vibration wear confidence of the target acquisition cycle is recorded as the wear confidence of the target acquisition cycle.

[0021] The vibration sequence of the target acquisition period is equally divided into a first preset number of vibration subsequences, the kurtosis of each vibration subsequence is calculated respectively, and the kurtosis of all vibration subsequences divided from the vibration sequence of the target acquisition period is determined according to the change trend of the kurtosis, so as to determine the kurtosis ratio of the target acquisition period.

[0022] The positive correlation processing result of the number of drops, the wear confidence and the kurtosis ratio of the target acquisition period is recorded as the steel ball wear coefficient of the target acquisition period.

[0023] Further, the determination method of the kurtosis ratio of the target acquisition period is:

[0024] The normalized value of the slope of the fitting straight line obtained by performing linear fitting on the kurtosis of all vibration subsequences divided from the vibration sequence of the target acquisition period is recorded as the kurtosis slope of the target acquisition period.

[0025] The range of the kurtosis of all vibration subsequences divided from the vibration sequence of the target acquisition period is recorded as the kurtosis range of the target acquisition period.

[0026] The ratio of the kurtosis range to the kurtosis slope of the target acquisition period is recorded as the kurtosis ratio of the target acquisition period.

[0027] Further, the determination method of the wear difference coefficient of the target acquisition period is:

[0028] The difference between the steel ball wear coefficient of the target acquisition period and the first acquisition period is recorded as the steel ball wear difference of the target acquisition period.

[0029] The initial trend similarity of the target acquisition period is determined according to the difference between the current sequence of the target acquisition period and the first acquisition period, the difference between the magic sound sequence and the difference between the vibration sequence.

[0030] The normalized value of the ratio of the steel ball wear difference to the initial trend similarity of the target acquisition period is recorded as the wear difference coefficient of the target acquisition period.

[0031] Further, the determination method of the initial trend similarity of the target acquisition period is:

[0032] The trend sequence of the magic sound sequence of the target acquisition period is obtained by performing sequence decomposition on the magic sound sequence of the target acquisition period, and the absolute value of the similarity of the trend sequence of the magic sound sequence of the target acquisition period and the first acquisition period is recorded as the magic sound initial trend similarity of the target acquisition period.

[0033] The trend sequence of the vibration sequence of the target acquisition period is obtained by performing sequence decomposition on the vibration sequence of the target acquisition period, and the absolute value of the similarity of the trend sequence of the vibration sequence of the target acquisition period and the first acquisition period is recorded as the vibration initial trend similarity of the target acquisition period.

[0034] The current sequence of the target acquisition period is subjected to sequence decomposition to obtain a trend sequence of the current sequence of the target acquisition period; and an absolute value of the similarity of the trend sequence of the current sequence of the target acquisition period and the first acquisition period is recorded as a current initial trend similarity of the target acquisition period.

[0035] An average of the magic sound initial trend similarity, the vibration initial trend similarity and the current initial trend similarity of the target acquisition period is recorded as an initial trend similarity of the target acquisition period.

[0036] Further, the speed rate control of the ball mill of the composite mineral admixture is realized according to the wear difference coefficient of the target acquisition period and the speed rate, and the specific method comprises the following steps:

[0037] A product of the wear difference coefficient of the target acquisition period and a preset speed rate adjustment value is recorded as an adjustment amount of the target acquisition period, and a sum of the adjustment amount of the target acquisition period and the speed rate is recorded as an adjusted speed rate of a next adjacent acquisition period of the target acquisition period.

[0038] The adjusted speed rate of the target acquisition period is taken as a value of the speed rate of the next adjacent acquisition period of the target acquisition period.

[0039] In the second aspect, the embodiment of the present application further provides a composite mineral admixture ball mill control system, comprising a memory, a processor and a computer program stored in the memory and running on the processor, and the processor realizes the steps of the method according to any one of the above-mentioned aspects when executing the computer program.

[0040] The present application has the following beneficial effects:

[0041] The application considers that the wear of the steel ball will cause the volume and mass of the steel ball to gradually decrease, and under the same preset rotation rate, the impact force generated by the smaller and lighter steel ball is weaker, and the collected driving current data, magic sound data and vibration data all show a slow and gradually decreasing trend. According to the change trend of the collected driving current data, magic sound data and vibration data, the wear degree of the steel ball appearing in the corresponding collection period is evaluated, the steel ball wear coefficient of the target collection period is determined, the greater the steel ball wear coefficient, the greater the wear degree of the steel ball appearing in the corresponding collection period of the steel ball wear coefficient, at this time, the wear of the steel ball is more mismatched with the pre-set rotation rate, and the influence of the steel ball wear on the grinding efficiency of the ball mill is greater, and the value of the corresponding rotation rate should be increased, so as to improve the grinding efficiency of the ball mill. Further, according to the difference between the wear degree of the steel ball appearing in each collection period and the first collection period, the error of the evaluation of the wear of the steel ball is reduced, the difference degree between the motion state of the steel ball in the corresponding collection period and the motion state at the initial grinding is evaluated, and the wear difference coefficient of the target collection period is determined. Finally, according to the wear difference coefficient of the target collection period and the rotation rate, the rotation rate control of the ball mill of the composite mineral admixture is realized, the problem that the fixed rotation rate is mismatched with the gradually worn steel ball in the fine grinding process of the ball mill and affects the quality of the grinding product is solved, the rotation rate in the fine grinding process of the ball mill is adjusted in real time, the grinding control effect of the ball mill is improved, the grinding efficiency is improved, and the energy consumption of the energy-saving motor of the ball mill is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0043] Figure 1 A flowchart of a composite mineral admixture ball mill control method provided by an embodiment of the present application;

[0044] Figure 2 A magic sound wear confidence acquisition flowchart provided by an embodiment of the present application. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0046] Referring to Figure 1 , which shows a composite mineral admixture ball mill control method flow chart provided by one embodiment of the application, the method comprises the following steps:

[0047] Step S001, collect driving current data, magic sound data and vibration data at different collection time in different collection period, construct current sequence, magic sound sequence and vibration sequence of each collection period.

[0048] Install current sensor on the energy-saving motor of the ball mill, install magic sound measuring instrument on the ground below the ball mill cylinder, and make the angle of the magic sound measuring instrument directly opposite the ball mill, and install vibration acceleration sensor on the bearing seat of the ball mill. From the time of adding balls to the ball mill to the next time of adding balls, and when the ball mill grinds ultra-fine size composite mineral admixture, use the current sensor to collect the current data of the energy-saving motor of the ball mill, use the magic sound measuring instrument to collect the magic sound data of the ball mill, and use the vibration acceleration sensor to collect the vibration data of the ball mill.

[0049] Among them, the collection frequency of current data in the embodiment is 30Hz, and the mean value of all current data collected in one second is recorded as the driving current data of the corresponding second. The collection frequency of magic sound data and vibration data in the embodiment is 1 second, and the driving current data, magic sound data and vibration data in 10 minutes are collected in one collection period.

[0050] The driving current data, magic sound data and vibration data collected in the same collection period are arranged in the order of collection as the current sequence, magic sound sequence and vibration sequence of the same collection period.

[0051] It should be noted that, in order to facilitate calculation, all driving current data, magic sound data and vibration data involved in the calculation in the embodiment are respectively pre-processed, and then the dimensional influence is cancelled. In the embodiment, Z-Score standard normalization method is used to carry out de-dimension processing on the driving current data, magic sound data and vibration data. In actual application process, implementers can use other methods such as existing technology of maximum and minimum value normalization method to carry out de-dimension processing, which is not limited herein.

[0052] At this point, the current sequence, magic sound sequence and vibration sequence of each collection period are obtained.

[0053] In step S002, any one collection period is recorded as a target collection period. According to the change trend of the magic sound data in the magic sound sequence of the target collection period and the difference between the magic sound sequences of the target collection period and the previous adjacent collection period, the magic sound first slope and the magic sound wear confidence of the target collection period are determined. According to the current sequence and the vibration sequence of the target collection period, the current first slope, the current wear confidence, the vibration first slope and the vibration wear confidence of the target collection period are determined. Combined with the magic sound first slope and the magic sound wear confidence and the change trend of the vibration data in the vibration sequence of the target collection period, the steel ball wear coefficient of the target collection period is determined.

[0054] When the energy-saving motor-driven ball mill starts grinding, the proportion of each material in the superfine composite mineral admixture, the ball-to-material ratio and the rotation rate are relatively stable, so the collected driving current data, magic sound data and vibration data are also relatively stable. As the grinding process proceeds, collisions occur between the steel balls and the admixture, the steel balls and the steel balls, and the steel balls and the cylinder, resulting in gradual wear of the steel balls and reduction of the impact force of the steel balls. At this time, the fixed rotation rate does not match the gradual loss of steel balls during fine grinding of the ball mill, and if the initial fixed rotation rate is still used, the grinding quality and efficiency will be reduced. Therefore, it is necessary to adjust the rotation rate based on the driving current data, magic sound data and vibration data collected in each collection period from the time when the ball mill is added with balls to the next time when the ball mill is added with balls, so as to improve the grinding efficiency and save energy.

[0055] Specifically, the wear of the steel balls will cause the volume and mass of the steel balls to gradually decrease. Under the same preset rotation rate, the impact force generated by smaller and lighter steel balls is weaker, and the collected magic sound data shows a slow and gradually decreasing trend.

[0056] Any one collection period is recorded as a target collection period.

[0057] The magic sound sequence of the target collection period is subjected to linear fitting to obtain a fitting straight line, and the slope of the fitting straight line is recorded as the magic sound first slope of the target collection period.

[0058] The magic sound first slope is used to evaluate the change trend of the magic sound data collected in the corresponding collection period. When the magic sound first slope takes a negative value and becomes smaller, the decreasing trend of the magic sound data collected in the corresponding collection period by the magic sound first slope is more obvious, and the possibility of wear of the steel balls in the corresponding collection period is greater and the wear is more serious.

[0059] The polynomial fitting algorithm is used to realize the straight line fitting of the magic sound sequence in this embodiment. The straight line fitting using the polynomial fitting algorithm is a known technology and will not be described again. In the actual application process, as other implementation manners, on the basis of achieving the purpose of straight line fitting, the implementer can use other methods such as the least square method, the overall mean method and the like to fit the straight line, and the present application does not make special limitation.

[0060] The ratio of the mean value of the magic sound data contained in the magic sound sequence of the target acquisition cycle to the magic sound data of the adjacent acquisition cycle before the target acquisition cycle is denoted as the magic sound first ratio of the target acquisition cycle.

[0061] The magic sound first ratio is used to evaluate the average change degree of the magic sound data collected in the corresponding acquisition cycle compared with the magic sound data collected in the adjacent acquisition cycle before the target acquisition cycle. When the magic sound first ratio is larger, the average change degree of the magic sound data collected in the corresponding acquisition cycle compared with the magic sound data collected in the adjacent acquisition cycle before the target acquisition cycle is larger, and the possibility of the steel ball appearing wear in the magic sound first ratio corresponding acquisition cycle is larger and the wear is more serious.

[0062] It should be noted that for the first acquisition cycle, the first acquisition cycle does not have a corresponding adjacent acquisition cycle before it, and the magic sound first ratio of the first acquisition cycle is directly assigned as 1.

[0063] The magic sound first slope of the target acquisition cycle is taken as the exponential value of the exponential function with the natural constant as the base number, the reciprocal of the calculated value of the exponential function is denoted as the magic sound first exponential value of the target acquisition cycle, and the positive correlation processing result of the magic sound first ratio and the magic sound first exponential value of the target acquisition cycle is denoted as the magic sound wear confidence of the target acquisition cycle.

[0064] It can be understood that the positive correlation processing is performed on the magic sound first ratio and the magic sound first exponential value, that is, the magic sound first ratio and the magic sound first exponential value are respectively positively correlated with the wear confidence. It can be understood that the positive correlation relationship of the present application refers to the relationship between the independent variable and the dependent variable, the independent variable is the magic sound first ratio and the magic sound first exponential value, and the dependent variable is the wear confidence. The positive correlation relationship is that the dependent variable increases (decreases) with the increase (decrease) of the independent variable, which can be an addition relationship, a multiplication relationship and the like.

[0065] Preferably, as an embodiment of the present application, the product of the magic sound first ratio and the first exponential value of the target acquisition cycle is denoted as the magic sound wear confidence of the target acquisition cycle.

[0066] In the actual application process, as other implementation manners, the sum of the magic sound first ratio and the first exponential value of the target acquisition cycle is denoted as the magic sound wear confidence of the target acquisition cycle.

[0067] The magic sound abrasion confidence is used to evaluate the possibility of the steel ball abrasion reflected by the magic sound data collected in the corresponding collection period. The greater the magic sound abrasion confidence is, the greater the possibility of the steel ball abrasion in the corresponding collection period is, and the more serious the steel ball abrasion is. The flow chart for obtaining the magic sound abrasion confidence is shown in FIG. 6. Figure 2

[0068] Since the original size of the superfine composite mineral admixture is small, as the steel ball is abraded, the amount of the steel ball and the amount of the mineral material taken up by the ball mill cylinder will decrease, the load of the ball mill will decrease, and then the current output by the energy-saving motor in the ball mill will also show a gradually decreasing trend. Meanwhile, as the steel ball is abraded, the intensity of the vibration generated by the steel ball to the cylinder will also decrease.

[0069] According to the magic sound sequence of the target collection period, the method for determining the magic sound first slope and the magic sound abrasion confidence of the target collection period is determined, according to the current sequence of the target collection period, the current first slope and the current abrasion confidence of the target collection period are obtained, and according to the vibration sequence of the target collection period, the vibration first slope and the vibration abrasion confidence of the target collection period are obtained.

[0070] The method for obtaining the current first slope and the current abrasion confidence of the target collection period is specifically as follows: the current sequence of the target collection period is subjected to linear fitting to obtain a fitting straight line, the slope of the fitting straight line is recorded as the current first slope of the target collection period. The ratio of the previous adjacent collection period of the target collection period to the mean value of the current data contained in the current sequence of the target collection period is recorded as the current first ratio of the target collection period. The current first slope of the target collection period is taken as the index value of an exponential function with the natural constant as the base number, the reciprocal of the calculation value of the exponential function is recorded as the current first index value of the target collection period, and the positive correlation processing result of the current first ratio and the current first index value of the target collection period is recorded as the current abrasion confidence of the target collection period.

[0071] The method for obtaining the vibration first slope and the vibration abrasion confidence of the target collection period is specifically as follows: the vibration sequence of the target collection period is subjected to linear fitting to obtain a fitting straight line, the slope of the fitting straight line is recorded as the vibration first slope of the target collection period. The ratio of the previous adjacent collection period of the target collection period to the mean value of the vibration data contained in the vibration sequence of the target collection period is recorded as the vibration first ratio of the target collection period. The vibration first slope of the target collection period is taken as the index value of an exponential function with the natural constant as the base number, the reciprocal of the calculation value of the exponential function is recorded as the vibration first index value of the target collection period, and the positive correlation processing result of the vibration first ratio and the vibration first index value of the target collection period is recorded as the vibration abrasion confidence of the target collection period.

[0072] ​The number of values that are negative in the first slope of the magic sound, the first slope of the current and the first slope of the vibration in the target acquisition period is recorded as the number of decreases in the target acquisition period.

[0073] The average of the magic sound wear confidence, the current wear confidence and the vibration wear confidence in the target acquisition period is recorded as the wear confidence in the target acquisition period.

[0074] The greater the number of decreases and the wear confidence in the target acquisition period, the greater the possibility that the steel ball has wear and the wear is more significant in the target acquisition period.

[0075] When the steel ball has serious wear, the volume and mass of the steel ball are significantly reduced, the kinetic energy of the steel ball when colliding with the steel ball or the cylinder is reduced, and the impact is no longer too sharp. At this time, the number of high-frequency transient fluctuations in the collected vibration signal is reduced. Usually, kurtosis is used to reflect the impact characteristics of the vibration signal, so the degree of wear of the steel ball can be evaluated according to the change of kurtosis.

[0076] The vibration sequence in the target acquisition period is equally divided into N1 vibration sub-sequences, the kurtosis of each vibration sub-sequence is calculated, the kurtosis of all vibration sub-sequences divided from the vibration sequence in the target acquisition period is linearly fitted, and the normalized value of the slope of the fitted straight line is recorded as the kurtosis slope of the target acquisition period. The range of the kurtosis of all vibration sub-sequences divided from the vibration sequence in the target acquisition period is recorded as the kurtosis range of the target acquisition period. The ratio of the kurtosis range to the kurtosis slope of the target acquisition period is recorded as the kurtosis ratio of the target acquisition period.

[0077] Wherein, the calculation of the kurtosis of the sequence is a known technology and will not be described again; N1 represents the first preset number, and the value of the first preset number in the embodiment is 10; in the embodiment, the normalized value of the slope of the fitted straight line is calculated by using the sigmoid function, wherein the sigmoid function is a known technology and will not be described again, and as other embodiments, the implementer can use other methods of prior art, such as tanh function, etc.

[0078] The greater the kurtosis range, the more significant the change of the impact force caused by the collision of the steel ball in the acquisition period corresponding to the kurtosis range, and the more serious the degree of wear of the steel ball. The kurtosis slope shows the trend of the kurtosis of all vibration sub-sequences divided from the vibration sequence in the acquisition period corresponding to the kurtosis slope.

[0079] The positive correlation processing result of the number of decreases, the wear confidence and the kurtosis ratio in the target acquisition period is recorded as the steel ball wear coefficient in the target acquisition period.

[0080] It can be understood that the number of decreases of the target acquisition period, the wear confidence and the kurtosis ratio are positively correlated, that is, the number of decreases of the target acquisition period, the wear confidence and the kurtosis ratio are respectively positively correlated with the steel ball wear coefficient of the target acquisition period.

[0081] Preferably, as an embodiment of the present application, the product of the number of decreases of the target acquisition period, the wear confidence and the kurtosis ratio is recorded as the steel ball wear coefficient of the target acquisition period.

[0082] The steel ball wear coefficient is used to evaluate the wear degree of the steel ball in the corresponding acquisition period. The larger the steel ball wear coefficient, the greater the wear degree of the steel ball in the corresponding acquisition period of the steel ball wear coefficient. At this time, the wear of the steel ball is more unmatched with the pre-set rotation rate, the influence of the wear of the steel ball on the grinding efficiency of the ball mill is greater, and the value of the corresponding rotation rate should be increased to improve the grinding efficiency of the ball mill.

[0083] The steel ball wear coefficient of any acquisition period can be obtained by the same method.

[0084] At this point, the steel ball wear coefficients of all acquisition periods are obtained.

[0085] Step S003, according to the differences of the current sequence, the magic sound sequence and the vibration sequence between the target acquisition period and the first acquisition period, and the difference of the steel ball wear coefficient between the target acquisition period and the first acquisition period, the wear difference coefficient of the target acquisition period is determined.

[0086] Further, according to the difference of the wear degree of the steel ball between each acquisition period and the first acquisition period, the error of the evaluation of the wear of the steel ball is reduced.

[0087] The difference between the steel ball wear coefficient of the target acquisition period and the first acquisition period is recorded as the steel ball wear difference of the target acquisition period.

[0088] The steel ball wear difference is used to evaluate the difference of the wear degree of the steel ball between the target acquisition period and the first acquisition period. When the steel ball wear difference is greater, the difference of the wear degree of the steel ball between the target acquisition period and the first acquisition period is greater, the difference of the ball ratio in the ball mill cylinder in the target acquisition period and the initial grinding is greater, and the rotation rate needs to be adjusted to adapt to the changed ball ratio of the ball mill to improve the grinding efficiency.

[0089] The magic sound sequence of the target acquisition period is processed using a sequence decomposition algorithm to obtain the trend sequence of the magic sound sequence of the target acquisition period.

[0090] The trend sequence of the magic sound sequence of each acquisition period can be obtained by the same method.

[0091] The absolute value of the similarity of the target acquisition cycle and the trend sequence of the magic sound sequence of the first acquisition cycle is recorded as the initial trend similarity of the target acquisition cycle.

[0092] The greater the initial trend similarity of the target acquisition cycle, the smaller the stability difference of the magic sound data of the target acquisition cycle and the first acquisition cycle, and the more significant the trend consistency.

[0093] The trend sequence of the vibration sequence of the target acquisition cycle is obtained by using the sequence decomposition algorithm. The trend sequence of the vibration sequence of each acquisition cycle can be obtained in the same way. The absolute value of the similarity of the target acquisition cycle and the trend sequence of the vibration sequence of the first acquisition cycle is recorded as the initial trend similarity of the vibration sequence of the target acquisition cycle.

[0094] The trend sequence of the current sequence of the target acquisition cycle is obtained by using the sequence decomposition algorithm. The trend sequence of the current sequence of each acquisition cycle can be obtained in the same way. The absolute value of the similarity of the target acquisition cycle and the trend sequence of the current sequence of the first acquisition cycle is recorded as the initial trend similarity of the current sequence of the target acquisition cycle.

[0095] The average of the initial trend similarity of the magic sound, the initial trend similarity of the vibration, and the initial trend similarity of the current of the target acquisition cycle is recorded as the initial trend similarity of the target acquisition cycle.

[0096] In this embodiment, the STL time series decomposition algorithm is used as the sequence decomposition algorithm to obtain the trend sequence of the sequence, and the Pearson correlation coefficient is used to obtain the similarity of the two trend sequences. As other embodiments, in actual application, the implementer can use other methods such as X11 seasonal decomposition algorithm in the prior art to perform sequence decomposition on the basis of achieving the purpose of sequence decomposition, and the implementer can use other methods such as cosine similarity in the prior art to obtain the similarity evaluation of the sequence on the basis of achieving the purpose of sequence similarity evaluation, and the present application does not make special limitations.

[0097] The normalized value of the ratio of the ball wear difference of the target acquisition cycle and the initial trend similarity is recorded as the wear difference coefficient of the target acquisition cycle.

[0098] In the ratio calculation process, in order to avoid the case that the denominator is zero, a preset value needs to be added to the denominator. The value of the preset value in the embodiment is 0.005.

[0099] The wear difference coefficient is used to evaluate the difference between the movement state of the steel ball in the ball mill and the movement state at the initial grinding in the corresponding collection period. The greater the wear difference coefficient, the more serious the overall wear of the steel ball in the corresponding collection period of the wear difference coefficient, the more significant the change of the material-ball ratio, and the greater the adjustment of the rotation rate should be.

[0100] The wear difference coefficient of any one collection period can be obtained in the same way.

[0101] At this point, the wear difference coefficients of all collection periods are obtained.

[0102] Step S004, according to the wear difference coefficient of the target collection period and the rotation rate, the rotation rate control of the ball mill of the composite mineral admixture is realized.

[0103] According to the wear difference coefficient of the target collection period and the rotation rate, the adjustment rotation rate of the next adjacent collection period of the target collection period is determined.

[0104] The product of the wear difference coefficient of the target collection period and the preset rotation rate adjustment value is recorded as the adjustment amount of the target collection period, and the sum of the adjustment amount of the target collection period and the rotation rate is recorded as the adjustment rotation rate of the next adjacent collection period of the target collection period.

[0105] It should be noted that the rotation rate of the first collection period is directly assigned as 65% in this embodiment, and the value of the rotation rate adjustment value in this embodiment is 7%; when the rotation rate of the next adjacent collection period of the target collection period is greater than 100%, the rotation rate of the next adjacent collection period of the target collection period is directly assigned as 100%.

[0106] The adjustment rotation rate of the target collection period is taken as the value of the rotation rate of the next adjacent collection period of the target collection period, so that the rotation rate is matched with the gradual loss of steel balls in the fine grinding process of the ball mill, the grinding efficiency is improved, the energy consumption of the energy-saving motor of the ball mill is reduced, and the quality of the grinding product is improved.

[0107] At this point, the ball mill control of the composite mineral admixture is realized.

[0108] Based on the same inventive concept as the above method, the embodiments of the present application also provide a composite mineral admixture ball mill control system, which comprises a memory, a processor, and a computer program stored in the memory and running on the processor, and the processor executes the computer program to realize the steps of any one of the above composite mineral admixture ball mill control methods.

[0109] The above description is only the preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the principle of the present application should be included in the protection scope of the present application.

Claims

1. A composite mineral admixture ball mill control method, characterized in that: The method comprises the following steps: Collect driving current data, magic sound data and vibration data at different acquisition times within different acquisition cycles, and construct current sequence, magic sound sequence and vibration sequence for each acquisition cycle; Record any acquisition cycle as a target acquisition cycle, and determine the magic sound first slope and magic sound wear confidence of the target acquisition cycle based on the change trend of the magic sound data in the magic sound sequence of the target acquisition cycle and the difference between the magic sound sequence of the target acquisition cycle and the previous adjacent acquisition cycle. Determine the current first slope, current wear confidence, vibration first slope, and vibration wear confidence of the target acquisition cycle based on the current sequence and vibration sequence of the target acquisition cycle respectively. Combine the magic sound first slope and magic sound wear confidence, as well as the change trend of the vibration data in the vibration sequence of the target acquisition cycle, to determine the steel ball wear coefficient of the target acquisition cycle; Determine the wear difference coefficient of the target acquisition cycle according to the difference in current sequence, magic sound sequence, and vibration sequence between the target acquisition cycle and the first acquisition cycle, and the difference in steel ball wear coefficient between the target acquisition cycle and the first acquisition cycle; The rotation rate of the ball mill for composite mineral admixtures is controlled according to the wear difference coefficient and the rotation rate of the target collection cycle.

2. A composite mineral admixture ball mill control method according to claim 1, characterized in that: The method for determining the first slope of the magic sound is: Perform a straight line fitting on the magic sound sequence of the target acquisition period, and record the slope of the fitted straight line as the first slope of the magic sound of the target acquisition period.

3. The composite mineral admixture ball mill control method according to claim 1, characterized in that: The method for determining the magic sound wear confidence is: The first slope of the magic sound of the target acquisition period is used as the exponent of an exponential function with a natural constant as the base, and the reciprocal of the calculated value of the exponential function is recorded as the first exponential value of the magic sound of the target acquisition period; Determining a first magic sound ratio of the target acquisition period based on a difference between the magic sound sequences of the target acquisition period and a previous adjacent acquisition period; The positive correlation processing result of the magic sound first ratio and the magic sound first index value of the target acquisition period is recorded as the magic sound wear confidence of the target acquisition period.

4. A composite mineral admixture ball mill control method according to claim 3, characterized in that: The method for determining the first magic sound ratio of the target acquisition period is: The ratio of the previous adjacent collection period of the target collection period to the average value of the magic sound data contained in the magic sound sequence of the target collection period is recorded as the first magic sound ratio of the target collection period.

5. The method for controlling a composite mineral admixture ball mill according to claim 1, wherein: The method of combining the magic sound first slope and the magic sound wear confidence, as well as the change trend of the vibration data in the vibration sequence of the target acquisition period, to determine the steel ball wear coefficient of the target acquisition period includes the following specific methods: The number of negative values ​​in the magic sound first slope, current first slope, and vibration first slope of the target acquisition period is recorded as the number of decreases in the target acquisition period; The average of the magic noise wear confidence, current wear confidence, and vibration wear confidence of the target acquisition period is recorded as the wear confidence of the target acquisition period; Dividing the vibration sequence of the target acquisition period into a first preset number of vibration subsequences, calculating the kurtosis of each vibration subsequence, and determining the kurtosis ratio of the target acquisition period based on the kurtosis change trend of all vibration subsequences divided from the vibration sequence of the target acquisition period; The positive correlation processing result of the number of decreases, wear confidence and kurtosis ratio of the target acquisition cycle is recorded as the steel ball wear coefficient of the target acquisition cycle.

6. A composite mineral admixture ball mill control method according to claim 5, characterized in that: The method for determining the kurtosis ratio of the target acquisition period is: The normalized value of the slope of the fitting line obtained by performing linear fitting on the kurtosis of all vibration subsequences divided from the vibration sequence of the target acquisition period is recorded as the kurtosis slope of the target acquisition period; The kurtosis range of all vibration subsequences divided from the vibration sequence of the target acquisition period is recorded as the kurtosis range of the target acquisition period; The ratio of the kurtosis range to the kurtosis slope of the target acquisition period is recorded as the kurtosis ratio of the target acquisition period.

7. The method for controlling a composite mineral admixture ball mill according to claim 1, wherein: The method for determining the wear difference coefficient of the target acquisition cycle is: The difference between the steel ball wear coefficients of the target acquisition cycle and the first acquisition cycle is recorded as the steel ball wear difference of the target acquisition cycle; Determine the initial trend similarity of the target acquisition cycle based on the difference in current sequence, magic sound sequence, and vibration sequence between the target acquisition cycle and the first acquisition cycle; The normalized value of the ratio of the steel ball wear difference in the target acquisition period to the initial trend similarity is recorded as the wear difference coefficient of the target acquisition period.

8. A composite mineral admixture ball mill control method according to claim 7, characterized in that: The method for determining the initial trend similarity of the target acquisition period is: Perform sequence decomposition on the magic sound sequence of the target acquisition cycle to obtain the trend sequence of the magic sound sequence of the target acquisition cycle. The absolute value of the similarity between the trend sequence of the magic sound sequence of the target acquisition cycle and the magic sound sequence of the first acquisition cycle is recorded as the initial trend similarity of the magic sound of the target acquisition cycle. Decompose the vibration sequence of the target acquisition period to obtain the trend sequence of the vibration sequence of the target acquisition period; record the absolute value of the similarity between the trend sequence of the vibration sequence of the target acquisition period and the first acquisition period as the initial trend similarity of the vibration of the target acquisition period; Decomposing the current sequence of the target acquisition period to obtain the trend sequence of the current sequence of the target acquisition period; The absolute value of the similarity between the trend sequence of the current sequence of the target acquisition cycle and the first acquisition cycle is recorded as the initial trend similarity of the current of the target acquisition cycle; The average of the magic sound initial trend similarity, the vibration initial trend similarity, and the current initial trend similarity of the target acquisition period is recorded as the initial trend similarity of the target acquisition period.

9. The method for controlling a composite mineral admixture ball mill according to claim 1, wherein: The rotation rate control of the ball mill for composite mineral admixtures is achieved based on the wear difference coefficient and the rotation rate of the target collection cycle, including the specific method as follows: The product of the wear difference coefficient of the target acquisition cycle and the preset rotation rate adjustment value is recorded as the adjustment amount of the target acquisition cycle, and the sum of the adjustment amount of the target acquisition cycle and the rotation rate is recorded as the adjusted rotation rate of the next adjacent acquisition cycle of the target acquisition cycle; The adjusted rotation rate of the target acquisition period is used as the value of the rotation rate of the next adjacent acquisition period of the target acquisition period.

10. A control system for a composite mineral admixture ball mill, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 9 are implemented.

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