CN114522776A - Zinc dross screening-grinding process - Google Patents

Zinc dross screening-grinding process Download PDF

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Publication number
CN114522776A
CN114522776A CN202210432212.1A CN202210432212A CN114522776A CN 114522776 A CN114522776 A CN 114522776A CN 202210432212 A CN202210432212 A CN 202210432212A CN 114522776 A CN114522776 A CN 114522776A
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grinding
screening
zinc dross
set time
time period
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CN114522776B (en
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曹轩宇
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Nantong Tengyu Environmental Protection Equipment Co ltd
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Nantong Tengyu Environmental Protection Equipment Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/1805—Monitoring devices for tumbling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/183—Feeding or discharging devices
    • B02C17/1835—Discharging devices combined with sorting or separating of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C2201/00—Codes relating to disintegrating devices adapted for specific materials
    • B02C2201/06—Codes relating to disintegrating devices adapted for specific materials for garbage, waste or sewage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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Abstract

The invention relates to the technical field of zinc dross screening and grinding, in particular to a zinc dross screening-grinding method, which comprises the following steps: in the working process of the ball mill, acquiring zinc dross grinding acoustic wave bands corresponding to all moments in a set time period, the weight of zinc dross isolated by a vibrating screen and the dust concentration on the upper part of the vibrating screen in real time, and determining a screening and grinding degree evaluation value of the zinc dross; and determining the screening and grinding type corresponding to the zinc dross screening and grinding degree evaluation value according to the zinc dross screening and grinding degree evaluation value and the range of the zinc dross screening and grinding degree evaluation value corresponding to each screening and grinding type which is predetermined, and further judging whether the ball mill needs to be stopped for finishing. The invention improves the efficiency of zinc dross screening, grinding and detecting and ensures the accuracy of zinc dross screening, grinding and detecting.

Description

Zinc dross screening-grinding process
Technical Field
The invention relates to the technical field of zinc dross screening and grinding, in particular to a zinc dross screening-grinding method.
Background
The ball mill and the vibrating screen are used as two main bodies for grinding and screening zinc dross, when the ball mill is used, the zinc dross is loaded into the cylinder body from the hollow shaft at the feeding end of the ball mill, the ball mill is driven to rotate, and the steel balls and the zinc dross in the cylinder body are driven to fall off under the action of gravity after being driven to a certain height, so that the zinc dross is ground and crushed. The vibrating screen is used for classifying zinc dross with different particle sizes according to granularity by utilizing a vibrating porous working surface, and is generally arranged below the discharge end of the ball mill so as to sieve the zinc dross. In order to know the grinding and screening state of the zinc dross in real time and judge whether the ball mill needs to be stopped for finishing, the grinding quality of the zinc dross screening needs to be determined.
The method for determining the screening and grinding quality of zinc dross in the prior art is generally manual detection, and the manual detection cannot reflect the grinding and screening states of the zinc dross in real time due to human factors and hysteresis, and cannot ensure the accuracy of screening, grinding and detecting the zinc dross.
Disclosure of Invention
In order to solve the technical problem of low accuracy of manually screening and grinding zinc dross, the invention aims to provide a zinc dross screening-grinding method.
In order to solve the technical problem, the invention provides a zinc dross screening-grinding method, which comprises the following steps:
in the working process of the ball mill, acquiring zinc dross grinding acoustic wave bands corresponding to all moments in a set time period, the weight of zinc dross isolated by a vibrating screen and the dust concentration on the upper part of the vibrating screen in real time;
determining a zinc dross screening and grinding degree evaluation value according to a zinc dross grinding sound wave band corresponding to each moment of a set time period, the weight of zinc dross isolated by a vibrating screen and the dust concentration on the upper part of the vibrating screen;
determining the screening and grinding type corresponding to the screening and grinding degree evaluation value of the zinc dross according to the screening and grinding degree evaluation value of the zinc dross and the range of the screening and grinding degree evaluation value corresponding to each screening and grinding type which is predetermined;
and judging whether the ball mill needs to be stopped for finishing or not according to the screening grinding type corresponding to the evaluation value of the screening grinding degree of the zinc dross.
Further, the step of determining the range of the evaluation value of the screening and grinding degree of zinc dross corresponding to each screening and grinding category comprises:
in the historical working process of the ball mill, acquiring zinc dross grinding acoustic wave bands corresponding to all times in N set time periods, the weight of zinc dross isolated by a vibrating screen and the dust concentration on the upper part of the vibrating screen;
determining a screening and grinding degree evaluation value of the zinc dross in each set time period according to the zinc dross grinding sound wave band corresponding to each moment of each set time period, the weight of the zinc dross isolated by the vibrating screen and the dust concentration on the upper part of the vibrating screen;
dividing the zinc dross screening and grinding degree evaluation values of N set time periods into various clusters, and determining screening and grinding categories corresponding to the various clusters according to the zinc dross screening and grinding degree evaluation values in the various clusters;
and determining the range of the evaluation value of the screening and grinding degree of the zinc dross corresponding to each screening and grinding category according to the evaluation value of the screening and grinding degree of each zinc dross in the screening and grinding category corresponding to each category.
Further, the step of determining the evaluation value of the screening grinding degree of the zinc dross for each set time period comprises the following steps:
determining a zinc dross grinding degree evaluation value of each set time period according to the zinc dross grinding acoustic wave band corresponding to each moment of each set time period and the dust concentration on the upper part of the vibrating screen;
according to the weight of the zinc dross separated by the vibrating screen corresponding to each moment of each set time period, determining the screening degree evaluation value of the zinc dross in each set time period;
and determining the evaluation value of the screening and grinding degree of the zinc dross in each set time period according to the evaluation value of the grinding degree of the zinc dross in each set time period and the evaluation value of the screening degree of the zinc dross.
Further, the step of determining the evaluation value of the grinding degree of zinc dross for each set time period comprises:
determining the change rate corresponding to any two adjacent zinc dross grinding sound wave sections in each set time period according to the zinc dross grinding sound wave sections corresponding to each moment in each set time period, and further determining the stability degree of the zinc dross grinding sound wave change rate in each set time period;
determining a dust concentration fitting straight line of each set time period according to the dust concentration on the upper part of the vibrating screen corresponding to each moment of each set time period, and further determining a dust concentration loss index value of each set time period;
determining the attaching degree of the dust concentration of the vibrating screen in each set time period according to the dust concentration loss index value in each set time period;
and determining the evaluation value of the grinding degree of the zinc dross in each set time period according to the stability degree of the change rate of the grinding sound wave of the zinc dross in each set time period and the attaching degree of the dust concentration of the vibrating screen.
Further, the step of determining the evaluation value of the grinding degree of zinc dross for each set time period comprises:
and multiplying the stability degree of the zinc dross grinding sound wave change rate of each set time period by the attaching degree of the dust concentration of the vibrating screen of each set time period, wherein the product is the evaluation value of the zinc dross grinding degree of each set time period.
Further, a calculation formula of the stability degree of the zinc dross grinding sound wave change rate in each set time period is as follows:
Figure 212429DEST_PATH_IMAGE002
wherein Q is the stability degree of the zinc dross grinding sound wave change rate of each set time period, K is the change rate corresponding to each two adjacent zinc dross grinding sound wave sections of each set time period, STD () is a variance function,
Figure 100002_DEST_PATH_IMAGE003
for the maximum value of the change rates corresponding to the two adjacent zinc dross grinding acoustic wave bands of each set time period,
Figure 744911DEST_PATH_IMAGE004
the minimum value of the change rates corresponding to the two adjacent zinc dross grinding acoustic wave bands of each set time period is obtained.
Further, the step of further determining a dust concentration loss index value for each set time period:
determining the dust concentration of the upper part of the vibrating screen corresponding to the dust concentration fitting straight line at each moment of each set time period;
and calculating the average value of the absolute values of the differences between the dust concentration of the upper part of the vibrating screen corresponding to each moment of each set time period and the dust concentration of the upper part of the vibrating screen corresponding to the dust concentration fitting straight line, wherein the average value is the dust concentration loss index value corresponding to the set time period.
Further, a calculation formula for determining the evaluation value of the screening and grinding degree of the zinc dross in each set time period is as follows:
Figure 567373DEST_PATH_IMAGE006
wherein u is an evaluation value of the screening and grinding degree of the zinc dross in each set time period, E is an evaluation value of the screening and grinding degree of the zinc dross in each set time period, and r is an evaluation value of the screening and grinding degree of the zinc dross in each set time period.
Further, the step of judging whether the ball mill needs to be stopped for finishing comprises the following steps:
if the screening grinding type corresponding to the evaluation value of the screening grinding degree of the zinc dross is the first screening grinding type or the second screening grinding type, stopping the ball mill for finishing is not needed;
and if the screening and grinding type corresponding to the evaluation value of the screening and grinding degree of the zinc dross is the third screening and grinding type, stopping the ball mill for finishing, and sequentially reducing the screening and grinding quality of the zinc dross corresponding to the first screening and grinding type, the second screening and grinding type and the third screening and grinding type.
The invention has the following beneficial effects:
the invention determines the evaluation value of the screening and grinding degree of the zinc dross by acquiring the grinding acoustic wave band of the zinc dross, the weight of the zinc dross isolated by the vibrating screen and the dust concentration on the upper part of the vibrating screen corresponding to each moment in the set time period in the working process of the ball mill in real time. And determining the screening and grinding type corresponding to the zinc dross screening and grinding degree evaluation value according to the zinc dross screening and grinding degree evaluation value and the range of the zinc dross screening and grinding degree evaluation value corresponding to each screening and grinding type which is predetermined, and further judging whether the ball mill needs to be stopped for finishing.
According to the invention, the screening and grinding degree evaluation value of the zinc dross is determined through the relevant data of the grinding and screening of the ball mill collected in real time, and then the screening and grinding type corresponding to the screening and grinding degree evaluation value of the zinc dross is determined.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions and advantages of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flow diagram of the zinc dross sieving-grinding process of the invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the technical solutions according to the present invention will be given with reference to the accompanying drawings and preferred embodiments. In the following description, different references to "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
This example provides a zinc dross sieving-grinding process, as shown in fig. 1, comprising the steps of:
(1) in the working process of the ball mill, the zinc dross grinding acoustic wave band corresponding to each moment in a set time period, the weight of zinc dross isolated by the vibrating screen and the dust concentration on the upper part of the vibrating screen are obtained in real time.
It should be noted that, the working scenario of the ball mill in this embodiment is as follows: a part of the zinc dross is added to the ball mill and ground, and the ball mill grinds the zinc dross while inverting the ground zinc dross. In addition, each data obtained in real time in this embodiment is data in the same time period, that is, the acoustic wave band for grinding zinc dross, the weight of zinc dross isolated by the vibrating screen, and the dust concentration on the upper portion of the vibrating screen, which correspond to each time in the same set time period.
(1-1) in the working process of the ball mill, the step of acquiring the zinc dross grinding acoustic wave band corresponding to each moment in a set time period in real time comprises the following steps:
in this embodiment, an acoustic detector is installed inside a cylinder of the ball mill, zinc dross grinding acoustic wave bands corresponding to respective moments within a set time period are collected in real time, and the zinc dross grinding acoustic wave bands corresponding to the respective moments collected by the acoustic detector are obtained at a receiving end in a wireless connection manner. The set time period of the embodiment is set to 1 second, the sampling frequency is 20hz, that is, 20 pieces of data are acquired in 1 second, and the zinc dross grinding acoustic wave band corresponding to each time in the set time period is denoted as S = { S1, S2, S3 … S20 }.
It should be noted that, since the acoustic wave band is generated by the mutual collision of the steel balls and the zinc dross in the cylinder of the ball mill with the cylinder wall, the acoustic wave band can represent the grinding state of the zinc dross in the ball mill.
(1-2) in the working process of the ball mill, the step of acquiring the weight of the zinc dross isolated by the vibrating screen corresponding to each moment in a set time period in real time comprises the following steps:
in this embodiment, a pressure sensor is installed at an appropriate position of the vibrating screen, the weight of the zinc dross isolated by the vibrating screen corresponding to each time within a set time period is collected in real time, the set time period is 1 second, the sampling frequency is 20hz, and the weight of the zinc dross isolated by the vibrating screen corresponding to each time within the set time period is recorded as M = { M1, M2, M3 … M20 }.
It should be noted that, when the ground zinc dross is inverted on the vibrating screen for vibrating screening, a part of the ground zinc dross with a particle diameter smaller than the gap diameter of the vibrating screen is directly infiltrated through the vibrating screen, the part of the zinc dross hardly stays on the vibrating screen, and the other part of the zinc dross with a particle diameter larger than the gap diameter of the vibrating screen stays on the vibrating screen for isolating the zinc dross by the vibrating screen collected in real time.
(1-3) in the working process of the ball mill, the step of acquiring the dust concentration at the upper part of the vibrating screen corresponding to each moment in a set time period in real time comprises the following steps:
in this embodiment, a pm concentration detector is installed on the top of the vibrating screen, and the concentration of dust in the air above the vibrating screen corresponding to each time within a set time period is collected, wherein the set time period is 1 second, and the sampling frequency is 20 hz. The dust generated in the process of inverting the zinc dross after grinding on the vibrating screen or vibrating the zinc dross after grinding on the vibrating screen is dust floating in the air due to the particle diameter of the zinc dross after grinding being too small, and the dust concentration in the air above the vibrating screen at each time within the set time period is represented as P = { P1, P2, P3 … P20 }.
(2) And determining the evaluation value of the screening and grinding degree of the zinc dross according to the grinding sound wave band of the zinc dross corresponding to each moment of the set time period, the weight of the zinc dross isolated by the vibrating screen and the dust concentration on the upper part of the vibrating screen.
Since the step of determining the evaluation value of the screening grinding degree of zinc dross according to the grinding acoustic wave band of zinc dross, the weight of zinc dross isolated by the vibrating screen and the dust concentration on the upper part of the vibrating screen corresponding to each time of the set time period is consistent with the step (3-2) described below, the specific content can refer to the step (3-2), and the detailed description is omitted here.
(3) And determining the screening and grinding type corresponding to the evaluation value of the screening and grinding degree of the zinc dross according to the evaluation value of the screening and grinding degree of the zinc dross and the range of the evaluation value of the screening and grinding degree of the zinc dross corresponding to each predetermined screening and grinding type.
In this embodiment, which of the respective classification and grinding categories the evaluation value of the degree of screening and grinding of zinc dross in step (2) belongs to is determined based on the evaluation value of the degree of screening and grinding of zinc dross in step (2) and the range of the evaluation values of the degree of screening and grinding of zinc dross corresponding to the respective classification and grinding categories determined in advance.
It should be noted that the screening and grinding category corresponding to the evaluation value of the screening and grinding degree of zinc dross determined by the real-time data can reflect the screening and grinding state of zinc dross, and this step avoids the complicated process of manually calculating data in real time to determine the screening and grinding state of zinc dross, and improves the efficiency of screening and grinding detection of zinc dross.
In order to determine to which of the screened grinding categories the evaluation value of the screening grinding degree of zinc dross in step (2) belongs, the key point is to determine in advance the range of the evaluation value of the screening grinding degree of zinc dross corresponding to each screened grinding category, the determining step comprises:
and (3-1) in the historical working process of the ball mill, acquiring the corresponding zinc dross grinding sound wave band at each moment in N set time periods, the weight of zinc dross isolated by the vibrating screen and the dust concentration on the upper part of the vibrating screen.
The step of obtaining the zinc dross grinding acoustic wave band corresponding to each time within N set time periods in the historical working process of the ball mill, the weight of the zinc dross isolated by the vibrating screen, and the dust concentration on the upper part of the vibrating screen can refer to the step (1), and the detailed process is not described. It should be noted that the N set time periods are N1 seconds, the sampling frequency is 20hz, and the larger the value N is, the more accurate the range of the evaluation value of the screening and grinding degree of zinc dross corresponding to each screening and grinding category is.
(3-2) determining a zinc dross screening and grinding degree evaluation value in each set time period according to the zinc dross grinding acoustic wave band corresponding to each moment in each set time period, the weight of zinc dross isolated by the vibrating screen and the dust concentration on the upper part of the vibrating screen, wherein the specific implementation steps comprise:
(3-2-1) determining a zinc dross grinding degree evaluation value of each set time period according to the zinc dross grinding acoustic wave band corresponding to each time of each set time period and the dust concentration on the upper part of the vibrating screen, and the specific implementation steps comprise:
(3-2-1-1) determining the change rate corresponding to any two adjacent zinc dross grinding sound wave sections in each set time period according to the zinc dross grinding sound wave sections corresponding to each moment in each set time period, and further determining the stability degree of the zinc dross grinding sound wave change rate in each set time period.
Determining the change rate corresponding to any two adjacent zinc dross grinding sound wave sections in each set time period according to the zinc dross grinding sound wave section corresponding to each moment in each set time period, wherein the calculation formula is as follows:
Figure 303248DEST_PATH_IMAGE008
wherein K is the change rate corresponding to any two adjacent zinc dross grinding sound wave sections in each set time period,
Figure DEST_PATH_IMAGE009
for the zinc dross grinding acoustic wave band corresponding to the a-th moment of each set time period,
Figure 502148DEST_PATH_IMAGE010
for the zinc dross grinding acoustic wave band corresponding to the a-1 st moment of each set time period,
Figure DEST_PATH_IMAGE011
is composed of
Figure 639868DEST_PATH_IMAGE009
And
Figure 633232DEST_PATH_IMAGE010
the difference between the values of the index.
It should be noted that the dynamic time warping DTW can eliminate the noise part in the two adjacent zinc dross grinding acoustic wave bands, so that the calculation value is more accurate, and the specific calculation process belongs to the prior art and is not in the protection scope of the present invention, and is not described herein again. In addition, in the embodiment, the change rate corresponding to any two adjacent zinc dross grinding sound wave sections in each set time period can be determined according to the calculation formula and is marked as K = { K1, K2, K3 … K19 }.
Determining the stability degree of the zinc dross grinding sound wave change rate of each set time period according to the change rate corresponding to any two adjacent zinc dross grinding sound wave sections of each set time period, wherein the calculation formula is as follows:
Figure 387562DEST_PATH_IMAGE002
wherein Q is the stability degree of the zinc dross grinding sound wave change rate of each set time period, K is the change rate corresponding to each two adjacent zinc dross grinding sound wave sections of each set time period, STD () is a variance function,
Figure 124573DEST_PATH_IMAGE003
for the maximum value of the change rates corresponding to the two adjacent zinc dross grinding acoustic wave bands of each set time period,
Figure 116800DEST_PATH_IMAGE004
the minimum value of the change rates corresponding to the two adjacent zinc dross grinding acoustic wave bands of each set time period is obtained.
It should be noted that, in the following description,
Figure 546645DEST_PATH_IMAGE012
is a very poor one with K = { K1, K2, K3 … K19}, which represents the overall stability of the data sequence. Due to the complexity of the internal working conditions of the ball mill, the data sequence is not stable, so that the fluctuation range of the data sequence is determined by utilizing extreme difference. The larger the range is, the larger the fluctuation of the data in the set time period is, that is, the overall stability of the data sequence is poor, and the smaller the range is, the smaller the fluctuation of the data in the set time period is, that is, the overall stability of the data sequence is better.
(3-2-1-2) determining a dust concentration fitting straight line of each set time period according to the dust concentration on the upper part of the vibrating screen corresponding to each time of each set time period, and further determining the dust concentration loss index value of each set time period.
(3-2-1-2-1) determining a fitting straight line of the dust concentration of each set time period according to the dust concentration of the upper part of the vibrating screen corresponding to each time of each set time period, wherein the step comprises the following steps:
in this embodiment, each time of each set time period is denoted as x = {1,2,3, … 20}, the dust concentration of the upper portion of the vibrating screen corresponding to each time of each set time period is denoted as y = { p1, p2, p3 … p20}, the slope of the dust concentration fitting straight line is determined as k according to x = {1,2,3, … 20} and y = { p1, p2, p3 … p20}, and the intercept of the dust concentration fitting straight line is determined by the undetermined coefficient method and is denoted as b, so that the dust concentration fitting straight line is determined and can be denoted as b
Figure DEST_PATH_IMAGE013
. Undetermined coefficient methods are prior art and are not within the scope of the present invention and will not be described in detail herein.
(3-2-1-2-2) determining a dust concentration loss index value of each set time period according to the fitted straight line of the dust concentration of each set time period and the dust concentration of the upper part of the vibrating screen corresponding to each moment of each set time period, wherein the steps comprise:
and determining the dust concentration of the upper part of the vibrating screen corresponding to the dust concentration fitting straight line at each moment of each set time period according to the dust concentration fitting straight line of each set time period.
According to the dust concentration of the upper part of the vibrating screen corresponding to each time of each set time period and the dust concentration of the upper part of the vibrating screen corresponding to the dust concentration fitting straight line, calculating the average value of the absolute value of the difference value between the dust concentration of the upper part of the vibrating screen corresponding to each time of each set time period and the dust concentration of the upper part of the vibrating screen corresponding to the dust concentration fitting straight line, wherein the average value is the dust concentration loss index value corresponding to the set time period, and the calculation formula is as follows:
Figure DEST_PATH_IMAGE015
wherein, the first and the second end of the pipe are connected with each other,
Figure 7844DEST_PATH_IMAGE016
for the dust concentration loss index value for each set period of time,
Figure DEST_PATH_IMAGE017
for the dust concentration on the upper part of the vibrating screen corresponding to the jth moment in each set time period,
Figure 282968DEST_PATH_IMAGE018
for the dust concentration at the upper part of the vibrating screen corresponding to the fitting straight line of the dust concentration at the jth moment in each set time period,
Figure DEST_PATH_IMAGE019
the number of individual moments in time for each set period.
(3-2-1-3) determining the attaching degree of the dust concentration of the vibrating screen in each set time period according to the dust concentration loss index value in each set time period, wherein the calculation formula is as follows:
Figure DEST_PATH_IMAGE021
wherein W is the attaching degree of the dust concentration of the vibrating screen in each set time period,
Figure 395280DEST_PATH_IMAGE016
the dust concentration loss index value for each set time period.
The purpose of determining the degree of conformity of the dust concentration of the vibrating screen is to determine the distance between the dust concentration on the upper portion of the vibrating screen corresponding to each time point in each set time period and the dust concentration on the upper portion of the vibrating screen corresponding to the fitting straight line of the dust concentration. Powder for each set time periodDust concentration loss index value
Figure 730446DEST_PATH_IMAGE016
The larger the adhesion degree W of the dust concentration of the vibrating screen per set time period, the more uniform the grinding degree of zinc dross, and the dust concentration loss index value per set time period
Figure 928210DEST_PATH_IMAGE016
The smaller the fit degree W of the dust concentration of the vibrating screen per set period of time, the more uneven the degree of grinding of zinc dross.
And (3-2-1-4) determining the evaluation value of the grinding degree of the zinc dross in each set time period according to the stability degree of the change rate of the grinding sound wave of the zinc dross in each set time period and the attaching degree of the dust concentration of the vibrating screen.
Multiplying the stable degree of the zinc dross grinding sound wave change rate of each set time period by the attaching degree of the dust concentration of the vibrating screen of each set time period, wherein the product is the evaluation value of the zinc dross grinding degree of each set time period, and the calculation formula is as follows:
Figure DEST_PATH_IMAGE023
wherein E is the evaluation value of the grinding degree of the zinc dross in each set time period, W is the attaching degree of the dust concentration of the vibrating screen in each set time period, and Q is the stability degree of the grinding sound wave change rate of the zinc dross in each set time period.
The evaluation value of the degree of zinc dross grinding for each set period of time is based on a comprehensive evaluation of the concentration of the dust on the vibrating screen and the change rate of the acoustic wave of zinc dross grinding for each set period of time, and the evaluation value of the degree of zinc dross grinding E for each set period of time is increased as the degree of adhesion W of the concentration of the dust on the vibrating screen and the degree of stability Q of the change rate of the acoustic wave of zinc dross grinding for each set period of time are increased.
(3-2-2) determining the evaluation value of the screening degree of the zinc dross in each set time period according to the weight of the zinc dross isolated by the vibrating screen corresponding to each time in each set time period, wherein the calculation formula is as follows:
Figure DEST_PATH_IMAGE025
wherein r is an evaluation value of the screening degree of the zinc dross in each set time period, M is the weight of the zinc dross isolated by the vibrating screen corresponding to each moment in each set time period, STD () is a variance function,
Figure 7024DEST_PATH_IMAGE026
isolating the maximum value of the weight of zinc dross for the respective vibrating screen at each time for each set period of time,
Figure DEST_PATH_IMAGE027
isolating the minimum of the weight of zinc dross for the respective time of each set period of time.
It should be noted that, in the following description,
Figure 973843DEST_PATH_IMAGE028
isolating the extreme difference between the maximum value and the minimum value in the weight of the zinc dross for the vibrating screen corresponding to each moment of each set time period, wherein the greater the extreme difference, the smaller the evaluation value of the screening degree of the zinc dross for each set time period, the worse the screening quality of the zinc dross for each set time period, the smaller the extreme difference, the greater the evaluation value of the screening degree of the zinc dross for each set time period, and the better the screening quality of the zinc dross for each set time period. In addition, the first and second substrates are,
Figure DEST_PATH_IMAGE029
normalized to the standard deviation, the range falls within [0,1 ]]And (4) the following steps.
(3-2-3) determining the evaluation value of the screening and grinding degree of the zinc dross in each set time period according to the evaluation value of the grinding degree of the zinc dross in each set time period and the evaluation value of the screening degree of the zinc dross, wherein the calculation formula is as follows:
Figure 463599DEST_PATH_IMAGE006
wherein u is an evaluation value of the screening and grinding degree of the zinc dross in each set time period, E is an evaluation value of the screening and grinding degree of the zinc dross in each set time period, and r is an evaluation value of the screening and grinding degree of the zinc dross in each set time period.
And (3-3) dividing the evaluation values of the screening and grinding degree of the zinc dross in N set time periods into various clusters, and determining the screening and grinding category corresponding to each cluster according to the evaluation value of the screening and grinding degree of the zinc dross in each cluster.
In this embodiment, the DBSCAN density clustering method is used to divide the evaluation values of the screening and grinding degrees of zinc dross in N set time periods into various clusters, which are respectively the first cluster, the second cluster and the third cluster, and calculate the mean values of the evaluation values of the screening and grinding degrees of zinc dross in the three clusters. According to the size of the mean value of the evaluation values of the screening and grinding degrees of the zinc dross of the three clusters, sorting the clusters in turn according to the order from large to small, namely a first cluster, a second cluster and a third cluster, wherein the screening and grinding quality of the zinc dross corresponding to the three clusters is reduced in turn, and the screening and grinding categories corresponding to the three clusters are as follows:
the first cluster is of a first sift grind type, which has a higher sift grind level.
The second cluster is of a second screen grind type, which has a lesser degree of screen grind.
The third cluster is of a third sieving and grinding category, and the sieving and grinding degree of the third sieving and grinding category is unqualified.
It should be noted that the DBSCAN density clustering method is the prior art, and is not within the scope of the present invention, and will not be described in detail herein.
And (3-4) determining the range of the evaluation value of the screening and grinding degree of the zinc dross corresponding to each screening and grinding category according to the evaluation value of the screening and grinding degree of the zinc dross corresponding to each category of clusters.
In this embodiment, the maximum value and the minimum value of the evaluation values of the screening and grinding degrees of zinc dross in the first screening and grinding category, the second screening and grinding category and the third screening and grinding category corresponding to the first category, the second category and the third category in step (3-3) are determined, and the range of the value range of the three screening and grinding categories, that is, the range of the evaluation values of the screening and grinding degrees of zinc dross corresponding to the three screening and grinding categories is determined according to the maximum value and the minimum value of the evaluation values of the screening and grinding degrees of zinc dross in the three screening and grinding categories.
At this point, the ranges of evaluation values of the screening and grinding degrees of zinc dross corresponding to the respective screening and grinding categories are determined through the steps (3-1) to (3-4). The range of the evaluation value of the screening and grinding degree of zinc dross corresponding to each screening and grinding type is determined in advance, and the step does not need to be repeated when the screening and grinding type corresponding to the evaluation value of the screening and grinding degree of zinc dross is obtained in real time.
(4) And judging whether the ball mill needs to be stopped for finishing or not according to the screening grinding type corresponding to the evaluation value of the screening grinding degree of the zinc dross.
In this embodiment, whether the ball mill needs to be stopped for finishing is determined according to the screening and grinding type corresponding to the evaluation value of the screening and grinding degree of zinc dross in step (3), and the specific determination steps are as follows:
and if the screening and grinding type corresponding to the evaluation value of the screening and grinding degree of the zinc dross is the first screening and grinding type or the second screening and grinding type, stopping the ball mill for finishing.
If the screening grinding type corresponding to the evaluation value of the screening grinding degree of the zinc dross is the third screening grinding type, the ball mill needs to be stopped for finishing.
The zinc dross classifying and grinding quality corresponding to the first classifying and grinding category, the second classifying and grinding category and the third classifying and grinding category is reduced in sequence. The zinc dross screening that first screening grinding category corresponds grinds the degree of grinding better, and the zinc dross screening that the second screening grinding category corresponds grinds the degree of grinding relatively poor, and the zinc dross screening that these two kinds of screening grinding categories grinds the degree of grinding all qualified, and the ball mill need not shut down and repaiies, but the zinc dross screening that the third screening grinding category corresponds grinds the degree of grinding unqualified, and the ball mill needs to shut down and repaiies.
The invention determines the evaluation value of the screening and grinding degree of the zinc dross through the data acquired in real time, further determines which screening and grinding category belongs to which screening and grinding category in each screening and grinding category the screening and grinding degree evaluation value of the zinc dross corresponds to, and judges whether the ball mill needs to be stopped for finishing or not according to the screening and grinding category corresponding to the evaluation value of the screening and grinding degree of the zinc dross. The invention not only improves the efficiency of zinc dross screening, grinding and detecting, but also ensures the accuracy of zinc dross screening, grinding and detecting, and further improves the working efficiency of the ball mill on the basis.
It should be noted that: the precedence order of the above embodiments of the present invention is only for description, and does not represent the merits of the embodiments. And specific embodiments thereof have been described above. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (9)

1. The zinc dross screening-grinding method is characterized by comprising the following steps:
in the working process of the ball mill, acquiring zinc dross grinding acoustic wave bands corresponding to all moments in a set time period, the weight of zinc dross isolated by a vibrating screen and the dust concentration on the upper part of the vibrating screen in real time;
determining a zinc dross screening and grinding degree evaluation value according to a zinc dross grinding sound wave band corresponding to each moment of a set time period, the weight of zinc dross isolated by a vibrating screen and the dust concentration on the upper part of the vibrating screen;
determining the screening and grinding type corresponding to the screening and grinding degree evaluation value of the zinc dross according to the screening and grinding degree evaluation value of the zinc dross and the range of the screening and grinding degree evaluation value corresponding to each screening and grinding type which is predetermined;
and judging whether the ball mill needs to be stopped for finishing or not according to the screening grinding type corresponding to the evaluation value of the screening grinding degree of the zinc dross.
2. The zinc dross screening-grinding method of claim 1, wherein the step of determining the range of evaluation values of the screening grinding degree of zinc dross corresponding to each screening grinding class comprises:
in the historical working process of the ball mill, acquiring zinc dross grinding acoustic wave bands corresponding to all times in N set time periods, the weight of zinc dross isolated by a vibrating screen and the dust concentration on the upper part of the vibrating screen;
determining a screening and grinding degree evaluation value of the zinc dross in each set time period according to the zinc dross grinding sound wave band corresponding to each moment of each set time period, the weight of the zinc dross isolated by the vibrating screen and the dust concentration on the upper part of the vibrating screen;
dividing the zinc dross screening and grinding degree evaluation values of N set time periods into various clusters, and determining screening and grinding categories corresponding to the various clusters according to the zinc dross screening and grinding degree evaluation values in the various clusters;
and determining the range of the evaluation value of the screening and grinding degree of the zinc dross corresponding to each screening and grinding category according to the evaluation value of the screening and grinding degree of each zinc dross in the screening and grinding category corresponding to each cluster.
3. The zinc dross sieve-grinding method of claim 1, wherein the step of determining the evaluation value of the degree of grinding of the zinc dross sieve for each of the set time periods comprises:
determining a zinc dross grinding degree evaluation value of each set time period according to the zinc dross grinding acoustic wave band corresponding to each moment of each set time period and the dust concentration on the upper part of the vibrating screen;
according to the weight of the zinc dross separated by the vibrating screen corresponding to each moment of each set time period, determining the screening degree evaluation value of the zinc dross in each set time period;
and determining the evaluation value of the screening and grinding degree of the zinc dross in each set time period according to the evaluation value of the grinding degree of the zinc dross in each set time period and the evaluation value of the screening degree of the zinc dross.
4. The zinc dross screening-grinding method of claim 3, wherein the step of determining the evaluation value of the degree of grinding of the zinc dross for each of the set time periods comprises:
determining the change rate corresponding to any two adjacent zinc dross grinding sound wave sections in each set time period according to the zinc dross grinding sound wave sections corresponding to each moment in each set time period, and further determining the stability degree of the zinc dross grinding sound wave change rate in each set time period;
determining a dust concentration fitting straight line of each set time period according to the dust concentration on the upper part of the vibrating screen corresponding to each moment of each set time period, and further determining a dust concentration loss index value of each set time period;
determining the attaching degree of the dust concentration of the vibrating screen in each set time period according to the dust concentration loss index value in each set time period;
and determining the evaluation value of the grinding degree of the zinc dross in each set time period according to the stability degree of the change rate of the grinding sound wave of the zinc dross in each set time period and the attaching degree of the dust concentration of the vibrating screen.
5. The zinc dross screening-grinding method of claim 4, wherein the step of determining the evaluation value of the degree of grinding of the zinc dross for each of the set time periods comprises:
and multiplying the stability degree of the zinc dross grinding sound wave change rate of each set time period by the attaching degree of the dust concentration of the vibrating screen of each set time period, wherein the product is the evaluation value of the zinc dross grinding degree of each set time period.
6. The zinc dross sieving-grinding method of claim 4, wherein the stability of the acoustic wave change rate of zinc dross grinding is calculated for each set period of time by:
Figure 397717DEST_PATH_IMAGE002
wherein Q is the stability degree of the zinc dross grinding sound wave change rate of each set time period, K is the change rate corresponding to each two adjacent zinc dross grinding sound wave sections of each set time period, STD () is a variance function,
Figure DEST_PATH_IMAGE003
for the maximum value of the change rates corresponding to the two adjacent zinc dross grinding acoustic wave bands of each set time period,
Figure 314857DEST_PATH_IMAGE004
the minimum value of the change rates corresponding to the two adjacent zinc dross grinding acoustic wave bands of each set time period is obtained.
7. The zinc dross screening-grinding method of claim 4, further comprising the step of determining a dust concentration loss index value for each of the set time periods:
determining the dust concentration of the upper part of the vibrating screen corresponding to the dust concentration fitting straight line at each moment of each set time period;
and calculating the average value of the absolute values of the differences between the dust concentration of the upper part of the vibrating screen corresponding to each moment of each set time period and the dust concentration of the upper part of the vibrating screen corresponding to the dust concentration fitting straight line, wherein the average value is the dust concentration loss index value corresponding to the set time period.
8. The zinc dross sieving-grinding method of claim 3, wherein the evaluation value of the zinc dross sieving-grinding degree for each set time period is determined by the formula:
Figure 563436DEST_PATH_IMAGE006
wherein u is an evaluation value of the screening and grinding degree of the zinc dross in each set time period, E is an evaluation value of the screening and grinding degree of the zinc dross in each set time period, and r is an evaluation value of the screening and grinding degree of the zinc dross in each set time period.
9. The zinc dross screening-grinding process of claim 1, wherein the step of determining whether the ball mill requires a shut down for refurbishment comprises:
if the screening grinding type corresponding to the evaluation value of the screening grinding degree of the zinc dross is the first screening grinding type or the second screening grinding type, stopping the ball mill for finishing is not needed;
and if the screening grinding type corresponding to the zinc dross screening grinding degree evaluation value is the third screening grinding type, stopping the ball mill for finishing, and sequentially reducing the screening grinding quality of the zinc dross corresponding to the first screening grinding type, the second screening grinding type and the third screening grinding type.
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