CN101936864A - Cigarette packet density online testing device - Google Patents

Abstract

The invention discloses a cigarette packet density online testing device. The device comprises one or more testing units, brackets, a position sensor, a data acquisition processing system and the like, wherein each testing unit comprises one or more radiation sources or X-ray sources and one or more ray detectors; the radiation sources and the detectors are arranged on the brackets at two sides of a cigarette packet to be tested respectively to form one or more testing units respectively for testing the density of a plurality of testing points of the cigarette packet; and the testing units complete cigarette packet density online testing on the plurality of the testing points of the cigarette packet to be tested according to a mathematical model, the density value of each point of the cigarette packet can be tested, m is a sequence number of the testing point, rho is the density value, K is a material calibration coefficient, n is the number of sampling times, Ni is count in the unit time of the detector when materials exist, and N0 is count in the unit time of the detector when materials do not exist. The device realizes online nondestructive testing, and has the characteristics of high testing accuracy, stability and reliability and the like.

Description

Cigarette package denseness on-line detection device

Technical field

The present invention relates to the online detection range of tobacco bale, especially a kind of cigarette package denseness on-line detection device.

Background technology

The homogeneity of cigarette package denseness is one of key factor that influences tobacco bale storage fermentation (alcoholization) quality.At present, each flue-cured tobacco factory all adopts static 9 sampling methods that cigarette package denseness is detected, being about to 9 sampling plates (as Fig. 1) is placed on above the tobacco bale, depress 15mm, aim at 9 points of model with the density sampler, press sample thief respectively, pressing the degree of depth of sample thief is 600mm or 500mm, take out 9 samples respectively, pack in the polybag of homogenous quantities and the label of annotating, then, weigh out the weight of each point sample respectively in the balance, and calculate the density value of 9 points, mean value, maximal value, minimum value, the maximum deviation a=of density maximal value and mean value (density maximal value-density mean value)/density mean value, the maximum deviation of density minimum value and mean value=(density minimum value-density mean value)/density mean value, then use a, maximal value≤set-point in the b absolute value (0.1) judges that being less than or equal to set-point is specification product, is considered as substandard product greater than the product of this value.Every batch of each grade products is by 2% sampling observation, less than 100 casees also to inspect 2 casees by random samples.

There is following shortcoming in prior art:

(1) during the hand sampling check fee, effort;

What (2) product is carried out is destructive the detection, causes waste;

(3) 2% sampling observation rate can not reflect the actual product quality of 100% product truly;

(4) sampling detects in warehouse for finished product, and this hysteresis sampling can not in time feed back to baling press adjustment with the information that detects.

Summary of the invention

The technical problem to be solved in the present invention is, a kind of cigarette package denseness on-line detection device is provided, and this device can not destroy under the situation of tobacco bale aborning, and fast detecting goes out each check point density.

The technical matters that the present invention further will solve is, detects substandard product, is rejected by device for eliminating, and gives baling press with the information feedback of substandard product simultaneously, so that baling press is adjusted in real time.

For achieving the above object, cigarette package denseness on-line detection device provided by the invention comprises: one or more detecting units, support, data acquisition processing system, it is characterized in that, described one or more detecting unit, comprise one or more radioactive sources or x-ray source and one or more ray detector, described radioactive source or x-ray source and ray detector are corresponding one by one to be installed on the support of tested tobacco bale both sides, and the detector of described several detecting units is connected with data acquisition processing system by cable; Wherein, described detecting unit is by mathematical model

Tested tobacco bale is finished the online detection of cigarette package denseness of a plurality of check points of tobacco bale, measure the density value of its each point, m is the check point sequence number, and ρ is a density value, and K is the material calibration coefficient, and n is a sampling number, N _iThe counting of detector unit interval when material is arranged, N ₀The counting of detector unit interval during for no material.

Above-mentioned cigarette package denseness on-line detection device is characterized in that, this device also comprises position transducer, and this position transducer is installed in the both sides of detecting unit the place ahead conveyor, and the installation site of position transducer will guarantee that each detecting unit is corresponding with check point.

Above-mentioned cigarette package denseness on-line detection device is characterized in that, this device also comprises device for eliminating, and described device for eliminating comprises support, driver, push rod and position transducer.When pick-up unit detects defective tobacco bale, disposal system is sent the signal enabling device for eliminating, and when defective tobacco bale moved to the position transducer place of device for eliminating, position transducer sent signal, stop conveying belt, defective tobacco bale is rejected by the driver drives push rod of device for eliminating.

Above-mentioned cigarette package denseness on-line detection device is characterized in that, described radioactive source can be selected for use ⁶⁰Co, ¹³⁷Cs, ²⁴¹Am or X source can be selected the X-ray pipe for use.

Above-mentioned cigarette package denseness on-line detection device is characterized in that, described ray detector is selected Na I scintillation counter or plastic scintillation counter or ionization chamber or proportional counter tube or G-M pipe for use.

Above-mentioned cigarette package denseness on-line detection device is characterized in that, described position transducer adopts photoelectrical position sensor.

For reaching the purpose of invention, the present invention also provides a kind of cigarette package denseness online test method, may further comprise the steps:

Step 1, demarcate in advance before detecting: to one or more detecting units its detector counting N in the unit interval when the no-load running ₀Demarcate, the material calibration coefficient k to the mathematical model of detecting unit employing demarcates with the known density tobacco leaf; Specific as follows

(1) press columns and learn the model programming, one or more detecting units then adopt a plurality of same mathematical models.

$\mathrm{\ρ}=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\mathrm{KLn}\left(\frac{N_i}{N_0}\right)/n$

(2) demarcate N ₀:

No-load running, per second is gathered a N _i, n gathers n time second altogether, obtains n N second _iMean value, that is: A plurality of detecting units then mark N separately respectively ₀Value.

(3) demarcate the K value:

Suppose a K value, and the input computing machine, place the detecting unit place to detect the tobacco bale check point, t records the tobacco leaf density p at certain detecting unit place after second _SurveyValue is taken out the tobacco leaf of this measurement point and is weighed with static sampler, draws the density p of this point as calculated _MarkAfter this value uses ρ _Survey, ρ _MarkK is revised; K _Repair=K (ρ _Mark/ ρ _Survey), with K _RepairValue input computing machine.A plurality of detecting units then mark K value of repairing separately respectively.

Step 2, online detection: one or more detecting units are finished the online detection of cigarette package denseness of a plurality of check points of tobacco bale to tested tobacco bale, measure the density value of its each point.

Step 3, data processing: data acquisition processing system calculates maximum deviation b=(density minimum value-density the mean value)/density mean value of maximum deviation a=(density maximal value-density mean value)/density mean value, density minimum value and the mean value of density mean value, maximal value, minimum value, density maximal value and the mean value of multiple spot according to the cigarette package denseness value of a plurality of check points of acquisition testing unit detection.

Step 4, judge whether tobacco bale is qualified: use a, the maximal value≤set-point in the b absolute value judges that being less than or equal to set-point is specification product, is considered as substandard product greater than the product of this value, and substandard product is rejected by device for eliminating.

The present invention has realized cigarette package denseness non-destructive online automatic detection, has solved the long-term unsolved difficult problem of the online detection of cigarette package denseness, compared with prior art has following benefit:

The non-destructive online auto monitoring has replaced destructive hand sampling to detect, and has saved human and material resources, has improved automatization level;

Tobacco bale has been realized 100% monitoring, has guaranteed the tobacco bale quality;

In real time testing result is fed back to baling press, make baling press in time adjust running parameter, improved the tobacco bale qualification rate, reduced production cost, improved economic benefit.

Description of drawings

9 method sampling plates of static sampling Detection synoptic diagram when Fig. 1 a, Fig. 1 b;

Fig. 2 a, Fig. 2 b detect nine check point denseness on-line detection devices of tobacco bale synoptic diagram simultaneously;

Fig. 3 a, Fig. 3 b are that the branch moved further detects cigarette package denseness pick-up unit synoptic diagram;

Fig. 4 a, Fig. 4 b, Fig. 4 c are branch moved further testing process synoptic diagram;

Fig. 5 is a cigarette package denseness online test method process flow diagram of the present invention.

Wherein Reference numeral is:

The 10-sampling plate

The 11-thief hole

The 21-support

22-radioactive source or x-ray source

The 23-tobacco bale

24-tobacco bale travelling belt

The 25-detector

The 26-data acquisition processing system

The 27-device for eliminating

28,28 ', 28 " position transducers

Embodiment

Further describe technical scheme of the present invention below in conjunction with accompanying drawing:

With reference to figure 2a, 2b and Fig. 3 a, 3b, cigarette package denseness on-line detection device of the present invention comprises one or more detecting units, this detecting unit comprise one or more radioactive sources or x-ray source 22 and one or more detector 25, support 21, position transducer 28 (28 ', 2 "), data acquisition processing system 26 and device for eliminating 27 (, being assumed to be m radioactive source or x-ray source and m detector) for ease of explanation.Wherein radioactive source 22 and detector 25 are installed in respectively on the support 21.Detector 25, position transducer 28 and device for eliminating 27 usefulness cables are connected with data acquisition processing system 26, tobacco bale between radioactive source 22 and detector 25 by accepting detection.M radioactive source or x-ray source 22, and m detector 25 is installed in the both sides (up and down or about or front and back) of tested tobacco bale respectively, particular location is by the determining positions of the required check point of tested tobacco bale, and radioactive source or x-ray source 22 are corresponding one by one with detector 25, constitute m detecting unit.The size of m is by how much the deciding of cigarette package denseness check point, and the distribution of detecting unit and position each other also are to need the distribution of check point and each other relative position decision by tobacco bale, and the two is corresponding one by one.For example: 9 point samplings that corresponding Static Detection is at present used, then m=9.9 detecting units will be corresponding one by one with 9 check point a, b, c, d, e, f, g, h, i as A, B, C, D, E, F, G, H, I.Be A---a, B---b, C---c, D---d, E---e, F---f, G---g, H---h, I---i.

M point to tobacco bale need detect as m=9 or 12 or 16, then forms 3 * 3,3 * 4,4 * 4 dot matrixs respectively and arranges, and once detects m point simultaneously.As shown in Figure 2.

In order to reduce the quantity of detecting unit, adopt tobacco bale to divide moved further to detect, with reference to figure 3a, 3b and Fig. 4 a, 4b, 4c, as m=3 (or 4,5), 3 detecting units are in one line, and requirement and tobacco bale moving direction are perpendicular, tobacco bale whenever moves once, detect 3 points (a, b, c), moving moves a step again detects d, e, f point, and final step detects the value that g, h, i are ordered.

Tobacco bale branch moved further is to be determined by position transducer 28 controls, as m=3, A is arranged, B, three detecting units of C, examined point 9 points, in view of the above, be subjected on the relevant position, inspection place the place ahead position transducer 28 to be installed at tobacco bale, 28 ', 2 ";; the installation of position transducer 28 will guarantee detecting unit A; B; C and check point a; b, c is corresponding one by one, the installation site of position transducer 28 ' will guarantee detecting unit A, B, C and check point d, e, f is corresponding one by one, position transducer 28 " the installation site to guarantee detecting unit A; B; C and check point g; h; i is corresponding one by one; when tobacco bale is examined, when tobacco bale moves to position sensor 28 positions, position transducer 28 sends signal and stops conveying belt, data handling system is sent signal A, B, the C detecting unit begins a, b, three check points of c detect, after finishing, detection sends the signal enabling conveying belt, tobacco bale begins to move, when tobacco bale move to position sensor 28 ' time, position transducer 28 ' sends signal and stops conveying belt, data handling system is sent signal A, B, the C detecting unit begins d, e, three check points of f detect, after finishing, detection sends the signal enabling conveying belt, tobacco bale begin to move to position transducer 28 " time; position transducer 28 " sends signal and stops conveying belt, A, B, the C detecting unit begins g, h, three check points of i detect, and tobacco bale moves A three times, B, the C detecting unit is finished the detection of 9 check points.

Device for eliminating 27 in the cigarette package denseness on-line detection device is made up of support, driver, push rod and position transducer, when data acquisition processing system 26 detects defective tobacco bale, sending the signal enabling device for eliminating starts working, when defective tobacco bale moves to the position transducer place of device for eliminating 27, position transducer sends signal and stops conveying belt, the driver of device for eliminating 27 is started working, and drives push rod defective tobacco bale is released outside the conveying belt.

The used radioactive source of cigarette package denseness on-line automatic detection device can be selected for use ⁶⁰Co, ¹³⁷Cs, ²⁴¹Am; X source is selected x ray generator (X-ray pipe) for use; Detector can be selected Na I scintillation counter or plastic scintillation counter or ionization chamber or proportional counter tube or G-M pipe for use.

The mathematical model that this pick-up unit detecting unit adopts is set up the radiation absorption law according to material, and the radiation absorption law has two kinds of expression forms: F=k ln (N _i/ N ₀) and F=k[ln (N _i/ N ₀)] ^{1+ δ}, the present invention is with F=k ln (N _i/ N ₀) set forth for example.

In order to eliminate the influence of statistic fluctuation, increase detection time t time-sampling second n time, so the mathematical model of m detecting unit is as follows:

${\mathrm{<figure-callout\; id="1"\; label="F"\; filenames="HSA00000261609000041.png"\; state="\{\{state\}\}">F</figure-callout>}}_1=\frac{\underset{i=1}{\overset{\mathrm{<figure-callout\; id="1"\; label="n\; k"\; filenames="HSA00000261609000041.png"\; state="\{\{state\}\}">n</figure-callout>}}{\mathrm{\&Sigma;}}}{k}_{}{}_1\mathrm{Ln}\left(\frac{N_{i1}}{N_{01}}\right)}{n}---\left(1\right)$

$F_2=\frac{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{k}_2\mathrm{Ln}\left(\frac{N_{i2}}{N_{02}}\right)}{n}---\left(2\right)$

$\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;$

$F_{m-1}=\frac{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{k}_{m-1}\mathrm{Ln}\left(\frac{N_{\mathrm{im}-1}}{N_{0m-1}}\right)}{n}---(m-1)$

$F_m=\frac{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{k}_m\mathrm{Ln}\left(\frac{N_{\mathrm{im}}}{N_{0m}}\right)}{n}---\left(m\right)$

F in the formula ₁～F _mBe respectively the tobacco leaf weight (g/cm on the tobacco bale check point place unit area ²); The counting of detector unit interval during for no material (individual/second);

The counting of detector unit interval when material is arranged (individual/second); k ₁～k _mBe the material calibration coefficient; N is a sampling number.

If it is S that detector records the floorage at tobacco bale check point place, the height of tobacco bale is H, because tobacco bale height unanimity, so the H=constant, then the volume of detected tobacco leaf is V=SH; Detect the weight W=FS of tobacco leaf, the density of tobacco leaf

The density mathematical model that can draw tobacco bale thus is:

${\mathrm{\&rho;}}_1=\frac{F_1}{H}=\underset{i=1}{\overset{\mathrm{<figure-callout\; id="1"\; label="n\; k"\; filenames="HSA00000261609000041.png"\; state="\{\{state\}\}">n</figure-callout>}}{\mathrm{\&Sigma;}}}{k}_{}{}_1\mathrm{Ln}\left(\frac{N_{i1}}{N_{01}}\right)/n\&CenterDot;H$

${\mathrm{\&rho;}}_2=\frac{F_2}{H}=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{k}_2\mathrm{Ln}\left(\frac{N_{i2}}{N_{02}}\right)/n\&CenterDot;H$

$\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;$

${\mathrm{\&rho;}}_{m-1}=\frac{F_{m-1}}{H}=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{k}_{m-1}\mathrm{Ln}\left(\frac{N_{i_{m-1}}}{N_{0m-1}}\right)/n\&CenterDot;H$

${\mathrm{\&rho;}}_m=\frac{F_m}{H}=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{k}_m\mathrm{Ln}\left(\frac{N_{\mathrm{im}}}{N_{0m}}\right)/n\&CenterDot;H$

This shows that ρ and F are proportional, so, detect F and also mean detection ρ.

Make K ₁=k ₁/ H; K ₂=k ₂/ H; K _M-1=k _M-1/ H; K _m=k _m/ H;

Then following formula can be changed into:

${\mathrm{\&rho;}}_1=\underset{i=1}{\overset{\mathrm{<figure-callout\; id="1"\; label="n\; K"\; filenames="HSA00000261609000041.png"\; state="\{\{state\}\}">n</figure-callout>}}{\mathrm{\&Sigma;}}}{K}_{}{}_1\mathrm{Ln}\left(\frac{N_{i1}}{N_{01}}\right)/n---{\left(1\right)}^{,}$

${\mathrm{\&rho;}}_2=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{K}_2\mathrm{Ln}\left(\frac{N_{i1}}{N_{02}}\right)/n---{\left(2\right)}^{,}$

$------$

${\mathrm{\&rho;}}_{m-1}=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{K}_{m-1}\mathrm{Ln}\left(\frac{N_{i1}}{N_{0m-1}}\right)/n---{(m-1)}^{,}$

${\mathrm{\&rho;}}_m=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{K}_m\mathrm{Ln}\left(\frac{N_{i1}}{N_{0m}}\right)/n---{\left(m\right)}^{,}$

(1) ', (2) ',------, (m-1) ', (m) ' be the mathematical model that the used cigarette package denseness of the present invention detects.

This mathematical model needs N before detection ₀₁... N _OmThe tobacco leaf of demarcating and using known density is respectively to K ₁..., K _mDemarcate.

M detecting unit measured the tobacco leaf density of a tobacco bale m check point, and the density value of the tobacco leaf of each check point that the data handling system utilization records calculates density mean value, maximal value, minimum value, a=(density maximal value-density mean value)/density mean value, the b=(density minimum value-density mean value)/density mean value of m check point.Then judge with the maximal value≤set-point in a, the b absolute value, the disallowable device of underproof tobacco bale is rejected, give baling press with the tobacco leaf density maximal value and the information feedback such as minimum value and present position thereof that record simultaneously, running parameter to baling press is adjusted, to guarantee the quality of tobacco bale.

Detecting below in conjunction with 9 method samplings of the static density of each flue-cured tobacco station-service at present is example, and the specific implementation method of cigarette package denseness pick-up unit of the present invention is described:

The cigarette package denseness pick-up unit of present embodiment comprises three ¹³⁷Cs radioactive source, this radiation intensity are 50mci (millicurie) point source; 3 NaI scintillation counters, wherein NaI is of a size of Φ 50mm * 50mm; The support of band shell; 3 photoelectrical position sensors; Contain device for eliminating electronic or air impeller and photoelectrical position sensor; Contain S ₇-300CPU, opens into/plc data the acquisition processing system of leaving module, TP-27 touch-screen and forms A/D, D/A.Wherein 3 radioactive sources and 3 detectors are installed in respectively on the top support and below support of tobacco bale conveying belt, and 3 detecting unit A of corresponding one by one composition, B, C, the mutual size of three detecting units and the sampling spot a of 9 sampling plates, b, c is corresponding, 3 photoelectrical position sensors are installed in detecting unit A, B, the place ahead of C, the top, both sides of conveying belt, distance apart from conveying belt is 360mm, photoelectrical position sensor 28 installation sites are apart from detecting unit A, B, the distance on plane, C place is 127mm, photoelectrical position sensor 28,28 ', 28 " between distance equate; be 381mm; the photoelectrical position sensor installation site will guarantee to move when detecting, A; B; C detecting unit and check point a; b, c; D, e, f; G, h, i are corresponding, device for eliminating be installed in photoelectrical position sensor 28 " appropriate location, conveying belt side, back.

The detector of detecting unit, photoelectrical position sensor, device for eliminating link to each other with the plc data acquisition processing system with cable, and PLC outputs signal to baling press.Shown in Fig. 3 a, Fig. 3 b

Adopt this device just can realize the online detection of portable cigarette package denseness.Further set forth cigarette package denseness On-line Measuring Method provided by the invention below with reference to Fig. 5 in conjunction with this pick-up unit, step is as follows:

Step 1: demarcate in advance before the detection.This step further comprises

Step 101,3 detecting units adopt mathematical model to be:

${\mathrm{\&rho;}}_1=\underset{i=1}{\overset{\mathrm{<figure-callout\; id="1"\; label="n\; K"\; filenames="HSA00000261609000041.png"\; state="\{\{state\}\}">n</figure-callout>}}{\mathrm{\&Sigma;}}}{K}_{}{}_1\mathrm{Ln}\left(\frac{N_{i1}}{N_{01}}\right)/n$

${\mathrm{\&rho;}}_2=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{K}_2\mathrm{Ln}\left(\frac{N_{i1}}{N_{02}}\right)/n$

${\mathrm{\&rho;}}_3=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{K}_3\mathrm{Ln}\left(\frac{N_{i1}}{N_{03}}\right)/n$

Programme according to above mathematical model.

Step 102 is demarcated N ₀₁, N ₀₂, N ₀₃

No material, the operation of conveying belt blanking bar, data acquisition processing system is gathered ray detector output signal N _I1, N _I2, N _I3, through t second, for example t=60 records N second _iMean value be N ₀₁, N ₀₂, N ₀₃Value supposes to record N ₀₁=5000/second, N ₀₂=5100/second, N ₀₃=5150/second, Zero calibration finishes.

Step 103 is demarcated K ₁, K ₂, K ₃

With the known density tobacco leaf to K ₁, K ₂, K ₃Demarcate:

The tobacco leaf density of selecting tobacco bale a check point place is that known density is demarcated, and at first demarcates K ₁, be about to the corresponding section that tobacco bale a check point places detecting unit A, earlier K of supposition ₁Value is as K ₁=70, the input data acquisition processing system, this moment, the mathematical model of detecting unit A was:

Demarcate beginning, data acquisition processing system is gathered a N _iAs N _i=2500, calculate one time ρ _i=0.673, through t second such as t=60S, record:

Equally tobacco bale a check point is placed detecting unit B corresponding section to demarcate K ₂, suppose K equally ₂=70, and the input computing machine, the nominal time is 60 seconds also, records ρ ₂=0.70g/cm ³, same tobacco bale a check point places detecting unit C corresponding section to record ρ ₃=0.69g/cm ³.

With 9 method sampling plates, sampler is aimed at the sampling of a measurement point, and sample thief is weighed, and obtains a point cigarette package denseness ρ of place through calculating _Standard=0.45g/cm ³

Use ρ _StandardAnd ρ ₁, ρ ₂, ρ ₃K revised:

With K _{1 repaiies}, K _{2 repair}, K _{3 repair}, the input data acquisition processing system, finished K ₁, K ₂, K ₃Demarcation.

Step 2, online detection:

Detecting unit A, B, C are according to above-mentioned ρ ₁, ρ ₂, ρ ₃Mathematical model carry out online detection.Conveying belt starts the drive tobacco bale and moves forward, when tobacco bale reached photoelectrical position sensor 28, photoelectrical position sensor 28 signalling conveying belt stopped, and detecting unit A, B, C aim at a, b at this moment, the c check point detects, as measurement time t=30 second, record: ρ _a=0.451g/cm ³, ρ _b=0.448g/cm ³, ρ _c=0.459g/cm ³, measure the startup conveying belt that finishes, tobacco bale moves forward, tobacco bale moves on to photoelectrical position sensor 28 ' time, photoelectrical position sensor 28 ' and sends the signal conveys band and stop, and detecting unit A, B, C aim at d, e, the f check point detects, measurement time t=30 second record: ρ _d=0.445g/cm ³, ρ _e=0.452g/cm ³, ρ _f=0.442g/cm ³, measure the startup conveying belt that finishes, tobacco bale moves forward, tobacco bale move on to photoelectrical position sensor 28 " time, photoelectrical position sensor 28 " send the signal conveys band and stop, recording equally:

ρ _g＝0.458g/cm ³、ρ _e＝0.452g/cm ³、ρ _i＝0.455g/cm ³.

Step 3, data processing:

After the pending data acquisition processing system has been surveyed the density value of 9 measurement points, carry out data processing, the ρ that offside gets _a, ρ _b, ρ _c, ρ _d, ρ _e, ρ _f, ρ _g, ρ _e, ρ _iValue is calculated, and draws ρ _{On average}=0.4503; ρ _Max=ρ _c=0.459; ρ _Min=ρ _f=0.442; A=(ρ _Max-ρ _{On average})/ρ _{On average}=(0.459-0.4503)/0.4503=0.02; Calculate b=-0.018 equally.

Step 4, judge:

Maximal value is a=0.02 in a, the b absolute value, comparing with a=0.02 and set-point, is 0.1 as set-point, and then a is less than set-point, this tobacco bale is that certified products pass through to detect, if a, judges then that it is a substandard product greater than set-point, data handling system starts device for eliminating work, when tobacco bale moves to the photoelectrical position sensor of device for eliminating, photoelectrical position sensor sends the signal conveys band to be stopped, and the device for eliminating drive operation drives push rod tobacco bale is released outside the conveying belt.

Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.

Claims (6)

1. cigarette package denseness on-line detection device, comprise one or more detecting units, support, data acquisition processing system, it is characterized in that, described detecting unit comprises one or more radioactive sources or x-ray source and one or more ray detector, described radioactive source or x-ray source and detector correspondence one by one are installed in tested tobacco bale both sides, and the detector of described detecting unit is connected with data acquisition processing system by cable;

Wherein, described detecting unit is by mathematical model

Tested tobacco bale is finished the online detection of cigarette package denseness of a plurality of check points of tobacco bale, measure the density value of its each point, m is the check point sequence number, and ρ is a density value, and K is the material calibration coefficient, and n is a sampling number, N _iThe counting of detector unit interval when material is arranged, N ₀The counting of detector unit interval during for no material.

2. cigarette package denseness on-line detection device according to claim 1, it is characterized in that, this device also comprises at least one position transducer, this position transducer is installed in the both sides of detecting unit the place ahead conveyor, and the installation site of position transducer will guarantee that each detecting unit is corresponding with check point.

3. cigarette package denseness on-line detection device according to claim 1 and 2, it is characterized in that, this device also comprises device for eliminating, this device for eliminating comprises support, driver, push rod and position transducer, when data handling system detects defective tobacco bale, disposal system is sent the signal enabling device for eliminating, when defective tobacco bale moves to the position transducer place of device for eliminating, position transducer sends signal and stops conveying belt, by the driver drives push rod of device for eliminating defective tobacco bale is released outside the conveying belt.

4. cigarette package denseness on-line detection device according to claim 1 and 2 is characterized in that described radioactive source is selected for use ⁶⁰Co, ¹³⁷Cs, ²⁴¹Am, described x-ray source is selected x ray generator for use.

5. cigarette package denseness on-line detection device according to claim 1 is characterized in that, described detector is selected Na I scintillation counter or plastic scintillation counter or ionization chamber or proportional counter tube or G-M pipe for use.

6. cigarette package denseness on-line detection device according to claim 2 is characterized in that, described position transducer adopts photoelectrical position sensor.

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