CN110160433B - Method, medium and equipment for measuring position of blasting bead in filter stick - Google Patents
Method, medium and equipment for measuring position of blasting bead in filter stick Download PDFInfo
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- CN110160433B CN110160433B CN201910452476.1A CN201910452476A CN110160433B CN 110160433 B CN110160433 B CN 110160433B CN 201910452476 A CN201910452476 A CN 201910452476A CN 110160433 B CN110160433 B CN 110160433B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
Abstract
The invention provides a method, a medium and equipment for determining the position of an exploded bead in a filter stick, wherein the set length is used as a measuring unit, the density of each measuring unit of each filter stick is measured, and the length and the density are used as dimension information to draw a filter stick density curve; dividing a design interval according to the design position of each exploded bead of the filter stick, and finding out the density value of each exploded bead in the filter stick by adopting a method of finding out the maximum density in the design interval of each exploded bead; determining the density wave crest type of each exploded bead in the filter stick, and determining the number taking range of the density wave crest of each exploded bead in the filter stick based on the wave crest type; and obtaining a regression curve equation of each bead blasting density peak through regression analysis, determining a horizontal coordinate corresponding to a curve vertex in the curve equation, and multiplying the horizontal coordinate by a measuring unit to obtain the position of the corresponding bead blasting.
Description
Technical Field
The disclosure relates to a method, medium and equipment for determining the position of an exploded bead in a filter stick.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The filter stick added with the exploded beads is used as a new filter stick material, and provides a good solution for forming the unique smoking taste and style of the cigarette. After the popping beads are pinched broken in the smoking process, the liquid in the glue beads can make the cigarette more fragrant in the smoking process, strengthen the fragrance or the characteristics and make the smoker feel more comfortable. At present, in the production process of a filter stick added with exploded beads, a lamp box method is generally adopted for detection of the exploded beads, the method utilizes strong backlight to irradiate the filter stick, and the positions of the exploded beads are observed and measured by human eyes, so that more problems exist, including:
the detection labor intensity is large, and the efficiency is low: the single product is detected for a long time, the eyes of a detector are easy to be tired, the eyesight of the detector is damaged greatly, the detection speed is relatively slow, and the mass production task is difficult to complete in a short time;
poor detection accuracy and low precision: only depending on the visual contrast, the detection accuracy is influenced by the light transmittance of the filter stick and the observation capability of human eyes, the detection is good when the contrast is obvious, but the detection cannot be effectively performed when the contrast is poor, and the filter stick with weak light transmittance is often observed for many times;
the utility of the subsequent cutting and processing of the filter stick is low: the filter stick often contains a plurality of exploded beads, the filter stick is required to be cut into a plurality of small sections (cigarette filter sticks) in the later period, the offset of the exploded beads cannot be measured and calculated by a lamp box method, and the subsequent cutting processing of the filter stick is not facilitated;
in the prior art, a method for detecting the bead explosion by adopting a visual detection system to carry out imaging processing on the observation effect under a lamp box is also researched, but the method still cannot effectively measure the accurate position of the bead explosion in the filter stick.
There is also a method of cutting the filter stick first and then measuring the position of the bead burst. The method not only damages the filter stick, but also easily disturbs the position of the exploded bead, and the center of the exploded bead is difficult to locate, thereby further increasing the measuring difficulty and interference factors.
Disclosure of Invention
The invention aims to solve the problems and provides a method, medium and equipment for measuring the position of an exploded bead in a filter stick.
According to some embodiments, the following technical scheme is adopted in the disclosure:
a method for measuring the position of an exploded bead in a filter stick comprises the following steps:
measuring the density of each measuring unit of each filter stick by taking the set length as the measuring unit, and drawing a filter stick density curve by taking the length and the density as dimension information;
dividing a design interval according to the design position of each exploded bead of the filter stick, and finding out the density value of each exploded bead in the filter stick by adopting a method of finding out the maximum density in the design interval of each exploded bead;
determining the density wave crest type of each exploded bead in the filter stick, and determining the number taking range of the density wave crest of each exploded bead in the filter stick based on the wave crest type;
and obtaining a regression curve equation of each bead blasting density peak through regression analysis, determining a horizontal coordinate corresponding to a curve vertex in the curve equation, and multiplying the horizontal coordinate by a measuring unit to obtain the position of the corresponding bead blasting.
As a further limitation, the specific process of drawing the density curve of the filter stick is as follows: and taking the set length S as a measuring unit, measuring the density of the bead-blasting filter stick by adopting a microwave resonance method, and drawing a filter stick density curve by taking the measuring unit as a horizontal axis unit, the length as a horizontal axis and the density as a vertical axis.
And as a further limitation, based on the design position of the blasting beads, defining a design interval for each blasting bead, and when the design position of the blasting bead is positioned at the end part of the filter stick, taking the end part close to the blasting bead to the middle position of the design position of the blasting bead and the design position of the first blasting bead adjacent to the design position of the blasting bead as the design interval of the blasting bead.
And when the design position of the bead explosion is not positioned at the end part of the filter stick, taking all the measuring units between the position of the bead explosion meter and the two adjacent design positions of the bead explosion as the design interval of the bead explosion.
As a further limitation, the density value of each exploded bead in the filter stick is found by adopting a method of finding out the maximum density in the design interval of each exploded bead, namely: and finding out the maximum density value in the design interval of each blasting bead as the density value of the blasting bead.
Further, when the measuring unit where the shot density is located at a boundary of the shot design area, if the shot density is less than or equal to the density value of an adjacent measuring unit in the adjacent shot design area, the shot design area reduces D/S measuring units from the boundary, wherein D is a shot diameter design value, S is a measuring unit, D, S units are the same, the measuring unit is obtained by a commercial further method, and the maximum density value is found again in the reduced design area and is used as the shot density.
Therefore, misjudgment caused by two blasting beads used for one density peak when the blasting beads are seriously deviated can be avoided.
By way of further limitation, the density peak types of the popped beads include both monomodal and bimodal.
As a further limitation, the difference of the density value of the exploded bead minus the density value of the left neighbor is marked as C1, and the difference of the density value minus the density value of the right neighbor is marked as C2;
and H represents a threshold value for judging whether the density peak is single peak or double peak, I represents the ratio of the smaller value to the larger value in C1 and C2, when I is more than or equal to H, the density peak is regarded as single peak, and when I is less than H, the density peak is regarded as double peak.
By way of further limitation, the obtained curve equation Y of each explosion bead density peak is aijX2+bijX+cijWherein a isij、bij、cijAll are coefficients, i is the ith filter stick, j is the jth exploded bead of the ith filter stick, when-aijWhen the pressure is smaller than the set threshold value, indicating that the bead blasting is missing, and not determining the position;
when-aijWhen the pressure is larger than or equal to the set threshold value, the position L of the blasting bead isij＝-bijS/(2aij)。
As a further limitation, the method further comprises the step of comparing the determined position of the shot with the design position of the shot to obtain the shot position offset, when the offset is less than 0, the shot is deviated to the measurement starting end, when the offset is equal to 0, no offset is obtained, and when the offset is greater than 0, the shot is deviated from the measurement starting end.
A computer readable storage medium having stored therein a plurality of instructions adapted to be loaded by a processor of a terminal device and to perform said method of determining the position of an exploded bead in a filter rod.
A terminal device comprising a processor and a computer readable storage medium, the processor being configured to implement instructions; the computer readable storage medium is used for storing a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing the method for determining the position of the burst bead in the filter stick.
Compared with the prior art, the beneficial effect of this disclosure is:
the method can realize simple, quick, accurate and nondestructive measurement of the bead blasting in the filter rod by using the microwave resonance method for detection. Meanwhile, the offset of the exploded bead can be measured and calculated, and the subsequent cutting processing of the filter stick is facilitated.
The measuring process is automatic, manual operation is replaced, efficiency is high, labor intensity is low, and operators are safe.
The method determines the threshold value p or p' by a statistical analysis method, can quantitatively predict and measure the error risk, realizes effective control of quality cost, calculates the bead blasting position by adopting the vertex of a regression analysis curve, and overcomes the defect that the position of the center point of the resonant cavity and the center of the bead blasting sphere cannot be superposed each time in the detection process because the position of the center point of the resonant cavity and the center of the bead blasting sphere is simply adopted to represent the bead blasting position;
according to the method, in the testing process, a filter stick is controlled to pass through a resonant cavity at a constant speed, data are measured at fixed time intervals, when the center of an exploded bead in the filter stick is coincident with the center of the resonant cavity, the measured density value of the exploded bead is the largest and is the only largest value, when the center of the exploded bead in the filter stick is located at the middle position of the resonant cavity measured twice, the measured density value of the exploded bead is the smallest and is the two equal largest values without being influenced by other factors, a single-peak and double-peak area division exploded bead wave crest counting mode is adopted, the position relation between the center of the resonant cavity and the center of the exploded bead in the testing process can be better reflected, the quality of regression analysis is improved, and the testing result is more accurate;
the density curve of the exploding beads is determined to be combined with the design interval, the accurate position of the exploding beads in the filter rod can be effectively measured, meanwhile, the filter rod cannot be damaged in the measuring process, the disturbance of the position of the exploding beads cannot be caused in the measuring process, the measuring difficulty and interference factors can be favorably eliminated, the problems of high detection labor intensity, low efficiency, poor detection accuracy and low precision when the filter rod is detected by a lamp box method are solved, and the damage to the filter rod caused by the mode of splitting the filter rod is overcome. The method has accurate measurement result, convenient operation and no damage to the filter stick.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 Density profile of a filter rod measurement of example 1;
FIG. 2 Density plot of Filter rod measurements of example 2;
FIG. 3 is a schematic diagram of searching for shot density when a point F is the end of a filter stick provided by the embodiment;
FIG. 4 is a schematic diagram of searching for shot density when point F is not the end of a filter rod according to an embodiment;
FIG. 5 is a schematic illustration of shot density in a case where the embodiment provides a calculation;
FIG. 6 is a schematic illustration of shot density for another calculation case provided by the example;
FIG. 7 is a schematic illustration of the embodiment providing a shot density in yet another calculation scenario.
The specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In order to make the technical solutions more clearly understood by those skilled in the art, specific technical principles and nouns are explained as follows:
the microwave resonance method is operated by a microwave density detector, specifically, the density change of the filter stick is detected by a microwave resonant cavity, and the position of the bead blasting is calculated by utilizing a second-order regression equation of a wave crest in a density curve.
The microwave is an electromagnetic wave with the frequency of about 300MHz to 300GHz (the wavelength is 1 mm-1 m), and the microwave is reflected when meeting metal and cannot absorb or conduct the metal; for insulating materials such as glass, ceramics, plastics and the like, microwaves can pass through but do not consume energy; for materials containing moisture, the energy of the microwaves is partially absorbed when the microwaves pass through the microwaves. Based on this characteristic, microwaves can achieve detection of density.
The method comprises the following specific steps:
according to the microwave measurement principle and the design principle of the resonant cavity, under the condition that the structural size of the resonant cavity is fixed, the measurement characteristics are directly reflected as 2 main parameters: the shift of resonance frequency and the change of resonance amplitude caused when the tested sample passes through the resonant cavity. In the filter stick added with the blasting beads, the density of the blasting bead part of the filter stick is obviously different from that of other position parts, the inventor finds that the deviation of the resonance frequency of the corresponding resonance curve and the change peak value of the resonance amplitude can effectively correspond to the blasting bead position in tests, and the blasting beads in the filter stick can be simply, quickly, accurately and nondestructively measured through the detection of a microwave resonance method. The method comprises the following steps:
drawing a density curve of the filter stick:
measuring the density of the bead blasting filter stick by using a microwave resonance method and taking the length S of 1mm or less as a measuring unit, and drawing a filter stick density curve by taking the measuring unit as a horizontal axis unit, the length as a horizontal axis and the density as a vertical axis;
based on the design position of the blasting beads, a design interval is defined for each blasting bead:
when the design position of the exploded bead is positioned at the end part of the filter stick, the position from the end part close to the exploded bead to the middle position of the design position of the exploded bead and the first design position adjacent to the design position of the exploded bead is used as the design interval of the exploded bead.
And when the design position of the bead explosion is not positioned at the end part of the filter stick, taking all the measuring units between the position of the bead explosion meter and the two adjacent design positions of the bead explosion as the design interval of the bead explosion.
Finding out the density value of each exploded bead in the filter stick:
finding out the maximum density value in the design interval of each blasting bead as the density value rho of the blasting beadijAnd i is the ith filter stick, and j is the jth exploded bead of the ith filter stick, and the following steps are carried out.
The specific bead blasting density calculation process comprises the following steps:
when a boundary of the detection unit with the maximum density is coincident with a boundary of a non-filter tip part of the bead blasting design interval, obtaining the density value of the current bead blasting and marking the density value as the initial density value of the current bead blasting; if the initial density value of the current bead blasting is smaller than or equal to the density value of the nearest detection unit in the bead blasting design interval adjacent to the current bead blasting, the current bead blasting design interval is reduced from the overlapped boundary line until the density value has an inflection point, the maximum density value is found out again in the reduced design area, and if the measurement unit where the maximum bead blasting density value is newly calculated is not located at the boundary line of the other non-filter stick end part of the design area, the newly calculated maximum bead blasting density value is used as the current bead blasting density; if the measuring unit where the bead blasting density is newly calculated is located at the boundary of the other non-filter tip end part of the design area, and the density of the measuring unit where the boundary of the other bead blasting design area adjacent to the boundary is located is larger than the newly calculated bead blasting density, continuously reducing the bead blasting design area and calculating the bead blasting density according to the method; when the density of the burst beads in the immediate vicinity of the burst bead design area is the density value of the immediate vicinity of one measuring unit, the density of the burst beads in the immediate vicinity of the burst bead design area is on the boundary line of the non-filter rod end portion, but is not recalculated.
As shown in fig. 3, if point F is the end of the filter rod, a range from F to a is a designed range of the implosion beads, the maximum value is point a, and the density value of point a is smaller than that of point B on the boundary line, the designed range is reduced from point a to point C, the density value of the next point E is larger than that of point C, point C is an inflection point, and the maximum density value of a new range from point C to point F is on point F, although the maximum density value is also on the boundary line, the end point of the filter rod is therefore the density value of the implosion beads;
the design interval of the B explosion bead is assumed to be from the point B to the point G, the maximum value is at the point B on the boundary line, but the density value of the point B is greater than the density value of the point A, so that the density value of the B explosion bead is not needed to be calculated, the density value of the point B is used, and the density value of the point B is not needed to be calculated when the density value of the point B is equal to the density value of the point A, otherwise, the peak of the point A, B is possibly missed.
As shown in fig. 4, if point F is not the end of the filter rod, a range from F to a is a design range of the nail explosion bead, the maximum value is at point a, and on the boundary line, the density value of point a is smaller than the density value of point B, the design range is reduced from point a to point C, the density value of the immediately adjacent point E is larger than that of point C, point C is a turning point, the maximum density value of a new range from point C to point F is at point F, point F is also on the boundary line, and is not the end point of the filter rod, the density value of point F is smaller than that of point G, the design range is reduced from point F to point H, the maximum density value of the new range from point H to point C is at point I, and the density value of point I is the density of the nail explosion bead; the density values of the B explosion bead and the C explosion bead can be directly used even on the boundary line and do not need to be recalculated.
For example: piThe density of the ith bead of the filter stick is milligram per cubic centimeter (mg/cm)3) I is a positive integer from 1 to m, and m is a design value of the number of the exploded beads of the filter stick;
Pi＝max{ρi,1、ρi,2、ρi,3……ρi,n}
ρi,1、ρi,2、ρi,3……ρi,nthe density values of all measurement units in the ith bead-blasting design area or the reduced design area of the filter stick are milligrams per cubic centimeter (mg/cm)3) And n is the maximum measuring unit number of the shot design area or the reduced design area.
As shown in FIG. 5, if P1＝ρ1,nAnd P is1≤ρ2,1The design region of the 1 st explosion bead is from rho1,nThe position of the detection unit is reduced to a first density value inflection point rho1,k(ρ1,k<ρ1,k-1) A detection unit; design region (p) after reduction1,1To rho1,k) Inner recalculation of P1Is prepared by'1The density of the 1 st exploding bead; at this time, if P2＝ρ2,1，P2No recalculation is necessary.
As shown in FIG. 6, if Pi＝ρi,1I ≠ 1 or m, and Pi＜ρi-1,nThen the design region of the ith explosion bead is from rhoi,1The position of the detection unit is reduced to a first density value inflection point rhoi,k(ρi,k<ρi,k+1) A detection unit; design region (p) after reductioni,kTo rhoi,n) Inner recalculation of PiObtaining P'i(ii) a If P'i≠ρi,nIs prepared by'iThe density of the ith explosion bead; if P'i＝ρi,nAnd P'i≤ρi+1,1Then the design region of the ith explosion bead is from rhoi,nThe position of the detection unit is reduced to a first density value inflection point rhoi,z(ρi,z<ρi,z-1) A detection unit; design region (p) after reductioni,kTo rhoi,z) Inner recalculation of PiIn order to obtain PiThe density of the ith explosion bead; at this time, if Pi+1＝ρi+1,1，Pi+1No recalculation is necessary.
As shown in FIG. 7, if Pm＝ρm,1And P ism＜ρm-1,nThe design region of the m-th explosion bead is from rhom,1The position of the detection unit is reduced to a first density value inflection point rhom,k(ρm,k<ρm,k+1) A detection unit; design region (p) after reductionm,kTo rhom,n) Inner recalculation of PmIs prepared by'mIs the density of the m-th popping beads, even if P'm＝ρm,nAnd is not recalculated.
Further, the density peak of the popping beads is defined as:
the maximum density value in the design interval of the blasting beads is the density value of the blasting beads, the blasting beads are spherical, the length of the measuring unit is smaller than the radius of the center of the blasting beads, when the blasting beads exist, the density value of the blasting beads is obviously higher than the density value around the blasting beads, and the density value of the blasting beads and the density value around the blasting beads form an obvious peak; when there is no popping, the density values of the popping and the density values around the popping will also form a peak due to the continuity of the material distribution in the filter rod, although the peak is less pronounced. Therefore, the density of the exploded bead and the peak formed by a certain number of density values around the density of the exploded bead are defined as the density peak of the exploded bead.
Determining whether the density peak of each exploded bead in the filter stick is a single peak or a double peak:
the resonant cavity has a certain width, the filter stick passes through the resonant cavity at a constant speed, the characteristic value of the resonant cavity is measured by an instrument according to a fixed time interval, and the bead blasting is spherical, so that the measured density value is maximum when only the center of the resonant cavity is coincident with the center of the bead blasting, the value is obviously higher than the adjacent density value, and at the moment, the density wave crest of the bead blasting is in an ideal single peak form;
only when the center of the bead blasting is positioned at the middle point of the two measurements, the two equal and maximum density values can be obtained by removing the influence of other factors, and at the moment, the density wave crest of the bead blasting is in an ideal double-peak form;
in actual measurement, the ideal single-peak and double-peak forms are obtained rarely, and in general, the center of a resonant cavity and the center of a ball of an exploding bead have certain deviation in measurement, so that the approximate single-peak and double-peak forms can be obtained;
the difference of subtracting the density value of the left neighbor from the density value of the exploded bead is recorded as C1, and the difference of subtracting the density value of the right neighbor from the density value of the exploded bead is recorded as C2;
h represents a threshold value for judging whether the density wave crest is single peak or double peak;
the ratio of the smaller value to the larger value of C1 and C2 is denoted by I, i.e., I ═ min { C1, C2}/max { C1, C2 };
when I is more than or equal to H, the density wave peak is taken as a single peak, and when I is less than H, the density wave peak is taken as a double peak;
tests show that for a certain fine count filter stick with exploded beads, when H is 70%, whether the exploded beads are lost or not is judged, and the positions of the exploded beads are calculated, so that the effect is good, and in practical application, the value of H can be determined according to the tests.
Determining the number taking range and the curve equation of the density wave crest of each exploded bead in the filter stick:
under the condition that the unit is the same, dividing the design diameter D of the blasting bead by the length S of the measuring unit, and marking the integral quotient obtained by the next method as n;
when the density peak of the blasting bead is a single peak, the density value rho of the blasting bead is usedijCentered on the data immediately to the left, n density values ρij-n……ρij-1，ρij-nDenotes ρijNth density value, p, on the leftij-1Denotes ρijFirst density value on the left; taking n density values rho from the data adjacent to the right side of the imageij+1……ρij+n，ρij+nDenotes ρijThe nth density value on the right, pij+1Denotes ρijThe first density value on the right; rhoij-n……ρij-1、ρij、ρij+1……ρij+nForming an array A, taking the array as a dependent variable Y value, and forming an array B by using the measuring unit serial numbers j-n … … j-1, j +1 … … j + n corresponding to the density values and the square value (j-n) of the unit serial numbers2……(j-1)2、j2、(j+1)2……(j+n)2Forming an array C, wherein B, C comprises variables X 'and X', and performing regression analysis to obtain a regression equation Y ═ aX '+ bX' + C, wherein a, b and C are equation coefficients;
when the density wave peak of the blasting beads is a double peak, taking the density value of the blasting beads and the larger density value of two adjacent values thereof as the center, taking n-1 density values and the density value of the blasting beads from the bilateral symmetry of the density value of the blasting beads to form an array together, taking the array as a dependent variable Y value, taking two arrays consisting of the measuring unit serial number corresponding to each density value and the square value of the unit serial number as variables X ', X', and performing regression analysis to obtain a regression equation Y (aX '+ bX' + c, wherein a, b and c are equation coefficients;
x' is replaced by X ═ X2The regression equation Y ═ aX "+ bX' + c obtained becomes Y ═ aX2And + bX + c is a parabola with an opening facing downwards, a is a negative value, and the absolute value of a is represented by a ', so that a' ═ a.
Judging whether the blasting bead is lost or not, when the blasting bead is lost, not calculating the position, and when the blasting bead is present, Y ═ aX2And the X-axis coordinate of the vertex of the + bX + c curve is the serial number of the measuring unit corresponding to the position L where the bead is positioned, and L is XS is bS/(2 a).
In the measurement method according to the present embodiment, since the radius/diameter of the popping bead itself is small, the length of the measurement unit is selected to be 1mm or less smaller than the radius of the popping bead for measurement.
As a possible implementation manner, in the implementation scheme, the means for measuring whether the bead blasting filter stick is missing or not includes:
and H is determined:
h was determined as a result of the experiment.
And calculating n:
in the case of the same unit, the design diameter D of the exploded bead is divided by the measurement unit length S, and the integer quotient obtained in the next method is used as n.
Measurement threshold p:
1. randomly collecting u filter stick samples (u is more than or equal to 20) which are known to have no loss and total damage after bead explosion and are more than 24 hours after damage, and measuring the density of each detection unit of each filter stick by using a microwave densitometer;
2. dividing a design interval according to the design position of each exploded bead of the filter stick;
3. finding out the density value rho of each exploded bead in the filter stick by adopting a method of finding out the maximum density in the design interval of each exploded beadij；
4. Calculating I of each exploded bead, comparing with H, and determining whether the density peak of each exploded bead in the filter stick is a single peak or a double peak;
5. determining the number taking range of the density wave crest of each exploded bead in the filter stick according to the single-peak and double-peak judgment results;
6. obtaining the curve equation Y of each bead density peak as a through regression analysisijX2+bijX+cij；
7. Finding all-aijAverage value of f, -aijThe standard deviation σ of (a);
8. determining the value of m;
9. the threshold p is determined as f-m σ.
Or measurement threshold p':
1', randomly collecting filter stick samples (u is more than or equal to 20) with known bead blasting loss, and measuring the density of each detection unit of each filter stick by using a microwave densitometer;
2', dividing a design interval according to the design position of each exploded bead of the filter stick;
3 ' finding out the density value rho ' of each exploded bead in the filter stick by adopting a method for finding out the maximum density in the design interval of each exploded bead 'ij；
4', calculating I of each exploded bead, and comparing with H to determine whether the density peak of each exploded bead in the filter stick is a single peak or a double peak;
5', calculating n, and determining the number taking range of the density wave crest of each exploded bead in the filter stick according to the single-peak and double-peak judgment results;
6 ' obtaining the curve equation Y ═ a ' of each exploding bead density peak through regression analysis 'ijX2+b′ijX+c′ij；
7 'obtaining all of-a'ijAverage value f ', -a'ijStandard deviation σ';
8', determining the value of m;
9 ', the determination threshold p ' + m σ '.
If the design value of a kind of bead blasting filter stick is not changed, the measured p or p' can be used as the threshold value all the time, when the change causing the threshold value change is designed, such as the change of the diameter of the bead blasting, the specification of the filament bundle, etc., the threshold value should be measured again according to the method.
Determination of-a of the sample to be testedij：
1. Measuring the density of each detection unit of each filter stick by using a microwave densitometer;
2. dividing a design interval according to the design position of each exploded bead of the filter stick;
3. finding out the density value rho of each exploded bead in the filter stick by adopting a method of finding out the maximum density in the design interval of each exploded beadij；
4. Calculating I of each exploded bead, comparing with H, and determining whether the density peak of each exploded bead in the filter stick is a single peak or a double peak;
5. determining the number taking range of the density wave crest of each exploded bead in the filter stick according to the single-peak and double-peak judgment results;
6. obtaining the curve equation Y of each bead density peak as a through regression analysisijX2+bijX+cij；
Judging whether the bead blasting is missing:
with-aijComparison with p or p':
when-aijWhen the number is more than or equal to p or p', the jth bead of the ith filter stick is not lost;
when-aijAnd when the number is less than p or p', the jth bead of the ith filter stick is lost.
Calculating the bead blasting position:
when the blasting beads are missing, position calculation is not carried out;
when the blasting bead exists, the position L of the blasting bead isij＝-bijS/(2aij)。
Specifically, example 1:
and H is determined:
through the test, H was determined to be 70%.
And calculating n:
the design diameter D of the exploded bead was 2.7mm, the unit length S was 1mm, and the integer quotient n obtained by the next method was 3.
Measurement threshold p:
1. randomly collecting 20 filter stick samples which are known to have no loss and total damage after bead explosion and are more than 24 hours after damage, and measuring the density of each detection unit of each filter stick by using a microwave densitometer;
2. dividing a design interval according to the design position of each exploded bead of the filter stick;
3. finding out the density value rho of each exploded bead in the filter stick by adopting a method of finding out the maximum density in the design interval of each exploded beadij；
4. Calculating I of each exploded bead, comparing with H, and determining whether the density peak of each exploded bead in the filter stick is a single peak or a double peak;
5. determining the number taking range of the density wave crest of each exploded bead in the filter stick according to the single-peak and double-peak judgment results;
6. obtaining the curve equation Y of each bead density peak as a through regression analysisijX2+bijX+cij；
7. Finding all-aijIs 0.94, -aij0.06 for the standard deviation σ of (1);
8. determining the value of m, wherein m is 3;
9. determining a threshold value: p-f-m σ 0.94-3 0.06 0.76.
Determination of-a of the sample to be testedij：
1. The density of each detection unit of the filter stick is measured by a microwave densitometer, as shown in figure 1
2. Dividing a design interval according to the design position of each exploded bead of the filter stick;
3. finding out the density value rho of each exploded bead in the filter stick by adopting a method of finding out the maximum density in the design interval of each exploded beadij；
4. Calculating I of each exploded bead, comparing with H, and determining whether the density peak of each exploded bead in the filter stick is a single peak or a double peak;
5. determining the number taking range of the density wave crest of each exploded bead in the filter stick according to the single-peak and double-peak judgment results;
6. obtaining the curve equation Y of each bead density peak as a through regression analysisijX2+bijX+cij：-a11＝0.22，-a12＝3.62、-b12＝328.52，-a13＝3.02、-b13＝458.40，-a14＝3.36、-b14＝711.98。
Judging whether the bead blasting is missing:
with-aijComparison with p:
-a11<p, the 1 st bead blasting loss of the 1 st filter stick;
-a12>p, the No. 2 burst bead of the No. 1 filter stick is not lost;
-a13>p, the No. 3 burst bead of the No. 1 filter stick is not lost;
-a14>p, the 4 th bead burst of the 1 st filter stick is not lost.
Calculating the bead blasting position:
the 1 st bead blasting of the 1 st filter rod is lost, and position calculation is not carried out;
no missing of No. 2 bead blasting of No. 1 filter stick and bead blasting position L12＝-b12S/2/a12＝328.52*1/2/3.62＝45.38(mm)；
No missing of No. 3 bead blasting of the No. 1 filter stick and bead blasting position L13＝-b13S/2/a13＝458.40*1/2/3.02＝75.90(mm)；
The 4 th bead explosion position L of the 1 st filter stick is not lost14＝-b14S/2/a14＝711.98*1/2/3.36＝105.95(mm)。
Example 2:
and H is determined:
through the test, H was determined to be 70%.
And calculating n:
the design diameter D of the exploded bead was 2.8mm, the unit length S was 1mm, and the integer quotient n obtained by the next method was 3.
Measurement threshold p':
1. randomly collecting 20 filter stick samples with known bead blasting loss, and measuring the density of each detection unit of each filter stick by using a microwave densitometer;
2. dividing a design interval according to the design position of each exploded bead of the filter stick;
3. finding out the density value of each exploded bead in the filter stick by adopting a method of finding out the maximum density in the design interval of each exploded bead
ρ′ij；
4. Calculating I of each exploded bead, comparing with H, and determining whether the density peak of each exploded bead in the filter stick is a single peak or a double peak;
5. determining the number taking range of the density wave crest of each exploded bead in the filter stick according to the single-peak and double-peak judgment results;
6. obtaining the curve equation Y ═ a 'of each popping bead density peak through regression analysis'ijX2+b′ijX+c′ij；
7. Obtaining all of-a'ijIs 0.20, -a'ij0.15 as the standard deviation σ';
8. determining the value of m, wherein m is 3;
9. determining a threshold value: p '+ m σ' ═ 0.20+3 × 0.15 ═ 0.65.
Determination of-a of the sample to be testedij：
1. Measuring the density of each detection unit of the filter stick by using a microwave densitometer, as shown in fig. 2;
2. dividing a design interval according to the design position of each exploded bead of the filter stick;
3. finding out the density value rho of each exploded bead in the filter stick by adopting a method of finding out the maximum density in the design interval of each exploded beadij；
4. Calculating I of each exploded bead, comparing with H, and determining whether the density peak of each exploded bead in the filter stick is a single peak or a double peak;
5. determining the number taking range of the density wave crest of each exploded bead in the filter stick according to the single-peak and double-peak judgment results;
6. obtaining the curve equation Y of each bead density peak as a through regression analysisijX2+bijX+cij：-a11＝0.13，-a12＝3.53、b12＝322.20，-a13＝3.87、b13＝584.18，-a14＝0.39。
Judging whether the bead blasting is missing:
with-aijComparison with p':
-a11<p', the 1 st bead blasting loss of the 1 st filter stick;
-a12>p', the No. 2 burst bead of the No. 1 filter stick is not lost;
-a13>p', the No. 3 burst bead of the No. 1 filter stick is not lost;
-a14<p', the 4 th bead burst of the 1 st filter rod is missing.
Calculating the bead blasting position:
the 1 st bead blasting of the 1 st filter rod is lost, and position calculation is not carried out;
no missing of No. 2 bead blasting of No. 1 filter stick and bead blasting position L12＝-b12S/2/a12＝322.20*1/2/3.53＝45.64(mm)；
No missing of No. 3 bead blasting of the No. 1 filter stick and bead blasting position L13＝-b13S/2/a13＝584.18*1/2/3.87＝75.48(mm)；
And (4) missing the 4 th bead explosion of the 1 st filter stick without position calculation.
The detection result (bead blasting position) of the embodiment 1-2 is further tested again by adopting a sectioning method, and the effect is completely accurate.
Accordingly, a computer readable storage medium is provided, in which a plurality of instructions are stored, the instructions being adapted to be loaded by a processor of a terminal device and to execute a method for determining a position of a bead burst in a filter rod provided in the above embodiments.
A terminal device comprising a processor and a computer readable storage medium, the processor being configured to implement instructions; the computer readable storage medium is for storing a plurality of instructions adapted to be loaded by a processor and to perform a method of determining the position of an exploded bead in a filter rod as provided in the various embodiments.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (10)
1. A method for measuring the position of an explosion bead in a filter stick is characterized in that: the method comprises the following steps:
measuring the density of each measuring unit of each filter stick by taking the set length as the measuring unit, and drawing a filter stick density curve by taking the length and the density as dimension information;
dividing a design interval according to the design position of each exploded bead of the filter stick, and finding out the density value of each exploded bead in the filter stick by adopting a method of finding out the maximum density in the design interval of each exploded bead;
determining the density wave crest type of each exploded bead in the filter stick, and determining the number taking range of the density wave crest of each exploded bead in the filter stick based on the wave crest type;
and obtaining a regression curve equation of each bead blasting density peak through regression analysis, determining a horizontal coordinate corresponding to a curve vertex in the curve equation, and multiplying the horizontal coordinate by a measuring unit to obtain the position of the corresponding bead blasting.
2. A method for determining the position of a popping bead in a filter rod according to claim 1, wherein: the specific process for drawing the density curve of the filter stick comprises the following steps: and taking the set length S as a measuring unit, measuring the density of the bead-blasting filter stick by adopting a microwave resonance method, and drawing a filter stick density curve by taking the measuring unit as a horizontal axis unit, the length as a horizontal axis and the density as a vertical axis.
3. A method for determining the position of a popping bead in a filter rod according to claim 1, wherein: according to the design position of the blasting beads, a design interval is defined for each blasting bead, when the design position of the blasting bead is positioned at the end part of the filter stick, the end part close to the blasting bead is started to the middle position of the design position of the blasting bead and the first blasting bead design position adjacent to the design position of the blasting bead, and the middle position is used as the design interval of the blasting bead;
when the design position of the blasting bead is not positioned at the end part of the filter stick, selecting the middle point of the first blasting bead design position adjacent to the design position of the blasting bead and the two sides of the blasting bead respectively, wherein all measuring units between the two middle points are the design interval of the blasting bead.
4. A method for determining the position of a popping bead in a filter rod according to claim 1, wherein: finding out the density value of each exploded bead in the filter stick by adopting a method of finding out the maximum density in the design interval of each exploded bead, wherein the density value is as follows: finding out the maximum density value in the design interval of each bead as the density value of the bead;
or, when the measuring unit where the shot density is located at a boundary of the shot design area, if the shot density is less than or equal to the density value of an adjacent measuring unit in the adjacent shot design area, the shot design area reduces D/S measuring units from the boundary, wherein D is a shot diameter design value, S is a measuring unit, D, S units are the same, the measuring unit is obtained by a commercial advancing method, and the maximum density value is found again in the reduced design area and is used as the shot density.
5. A method for determining the position of a popping bead in a filter rod according to claim 1, wherein: the density peak types of the popped beads include both monomodal and bimodal.
6. A method for determining the position of a popping bead in a filter rod according to claim 5, wherein: the difference of subtracting the density value of the left neighbor from the density value of the exploded bead is recorded as C1, and the difference of subtracting the density value of the right neighbor from the density value of the exploded bead is recorded as C2;
and H represents a threshold value for judging whether the density peak is single peak or double peak, I represents the ratio of the smaller value to the larger value of C1 and C2, when I is more than or equal to H, the density peak is regarded as single peak, and when I is less than H, the density peak is regarded as double peak.
7. A filter stick implosion as defined in claim 2A method for measuring the position of a bead, characterized by: the obtained curve equation of each explosion bead density peak is Y = aijX2+bijX+cijWherein a isij、bij、cijAll are coefficients, i is the ith filter stick, j is the jth exploded bead of the ith filter stick, when-aijWhen the pressure is smaller than the set threshold value, indicating that the bead blasting is missing, and not determining the position;
when-aijWhen the pressure is larger than or equal to the set threshold value, the position L of the blasting bead isij =-bijS/（2aij）。
8. A method for determining the position of a popping bead in a filter rod according to claim 1, wherein: the method further comprises the step of comparing the determined position of the blasting bead with the designed position of the blasting bead to obtain the position offset of the blasting bead, when the offset is smaller than 0, the deviation is shown to be deviated to the measurement starting end, the offset is equal to 0, no deviation is shown, and the offset is larger than 0, the deviation is shown to be deviated to the measurement starting end.
9. A computer-readable storage medium having stored therein a plurality of instructions, characterized in that: the instructions are adapted to be loaded by a processor of a terminal device and to carry out a method of determining the position of an exploded bead in a filter rod according to any one of claims 1 to 8.
10. A terminal device comprising a processor and a computer readable storage medium, the processor being configured to implement instructions; a computer readable storage medium for storing a plurality of instructions adapted to be loaded by a processor and to carry out a method of determining the position of an exploded bead in a filter rod according to any one of claims 1 to 8.
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