CN101158654A - Completed product packaging box short piece detecting apparatus and detecting method - Google Patents

Abstract

The invention discloses a detection device used for detecting short parts in finished packages, which is installed on a conveyor for the finished packages, including at least one detection module, each of which consists of at least one X-ray light source and at least one X-ray detector; at least one position detector that is arranged at sides of a belt of the conveyor and used for monitoring enter / leave testing area and outputting signals to a data acquisition and control system; the data acquisition and control system is connected with connecting X-ray detectors and the position detectors to receive and process data from connecting X-ray detectors and the position detectors as well as provide control signals. The device is characterized by being nondestructive and speedy detection and the invention can check whether finished packages are short of parts and remove unqualified packages on line.

Description

Completed product packaging box short piece detecting apparatus and detection method thereof

Technical field

The present invention relates to the radiation online measuring technique, the especially online detection of completed product packaging box short piece (lacking bag) as cigarette bar box-missing, bar cigarette.

Background technology

China's application number 02100306.8, name is called " regular connection with wrapping of piece case Short Item on-line measuring device " and Chinese application number 200410073695.2, the patent of invention of title " strip tobacco package lack on-line detecting device and detection method thereof ", all adopt gamma ray projector and gamma ray detector, finished product case Short Item and the scarce bag of bar cigarette are detected.Existing pick-up unit remains in following defective owing to adopted gamma-rays to detect:

(1) gamma-rays launched of gamma-rays pick-up unit is produced by the radioactive atom nuclear decay, atomic nucleus is pressed it from regular decay, whether pipe unit work not to be, all ceaselessly produce gamma-rays, in case radioactive sources lost takes place or out of controlly just may cause serious liability accident or cause personal injury in mismanagement.

(2) gamma-ray energy is higher, is difficult for protection (shielding);

(3) the higher ray lower of gamma-ray energy with respect to energy, the gamma-rays that the same substance of same weight absorbs will lack with regard to the lower radiation absorption of specific energy, and it is lower than the accuracy in detection that adopts the lower ray of energy to adopt gamma-ray detection.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of pick-up unit and detection method of completed product packaging box short piece.This device adopts X source and X-ray detector that the finished product packing case is detected, and it is harmless, device for fast detecting, can online detection finished product packing case Short Item also can the defective packing case of online rejecting.

In order to achieve the above object, the pick-up unit of completed product packaging box short piece provided by the invention is installed on the conveyor of finished product packing case, it is characterized in that, comprising:

At least one detecting unit, described each detecting unit comprises: at least one X source and at least one X-ray detector;

At least one position sensor, the conveying belt both sides that it is installed in conveyor are used to monitor packing case and enter/leave the test section, and output signal to data acquisition control system;

One data acquisition control system, it connects described X-ray detector and described position sensor, and control signal is handled and provided to the detection data that receives described X-ray detector and described position sensor.

Above-mentioned detection device is characterized in that, also comprises an installation frame, is installed on the described conveying belt with respect to the conveying belt horizontal stroke of packing case/perpendicular cross-over connection, and this framework comprises:

One X source case is used to install described X source;

One X-ray detector case is used to install described X-ray detector;

Web joint is used to connect described X source case and X-ray detector case and constitutes framework.

Above-mentioned detection device is characterized in that, also comprises a shielding protection plate, and it is installed in described X ray and surveys the interior X-ray detector back of case.

Above-mentioned detection device, it is characterized in that, also comprise a collimating plate, it is installed in described X ray and surveys the interior X-ray detector front of case, have the ray collimating aperture in the position of aiming at described X-ray detector, the X ray that X source sends is mapped on the X-ray detector through described collimating aperture.

Above-mentioned detection device, it is characterized in that, also comprise a device for eliminating, be installed in the exit of described conveying belt test section, this device for eliminating comprises: support, driver, push rod, rejecting slideway and position sensor, after described data acquisition control system receives the signal that position sensor sends, start the driver drives push rod defective packing case is rejected.

Above-mentioned detection device is characterized in that, also comprises a fair water fin, is installed in described conveying belt top, is used for the fixed position of the packing case water conservancy diversion on the conveying belt to the test section.

Above-mentioned detection device is characterized in that, described X source is made up of power-supply system, x ray generator and cooling system, and described x ray generator adopts the X-ray pipe, and the negative electrode and the high pressure between anode of described X-ray pipe are adjustable, in order to change X ray intensity.

Above-mentioned detection device is characterized in that, described position sensor is selected photoelectric type position detector or touch switch or automatically controlled stop means for use.

Above-mentioned detection device is characterized in that, described X-ray detector is scintillation counter or ionization chamber or proportional counter tube or G-M pipe.

For further realizing goal of the invention, the present invention also provides a kind of detection method of completed product packaging box short piece, is used to comprise the pick-up unit of detecting unit, position sensor, data acquisition control system formation, it is characterized in that, comprising:

Step 1 is demarcated detected parameters in advance and is determined criterion: when non-packing box no-load running, demarcates the mean value of interior described detecting unit output signal at certain time intervals; There is being packing case load running markers to fix on the mean value of described detecting unit output signal in the certain hour interval; Calculate and determine criterion according to the secondary calibration result;

Step 2, online detection: under the production run condition, when packing case ran to the detection zone of detecting unit, described data acquisition control system detected packing case;

Step 3, Short Item are judged: compare according to described online testing result and described criterion, judgement the packing case of surveying Short Item whether.

Above-mentioned detection method is characterized in that, described step 1 further comprises:

Step 101 is set up the mathematical model of detecting unit $P_i=\mathrm{Ln}\left(\frac{\mathrm{Ni}}{N0}\right),$ Wherein:

P _iSurface density (g/cm for the piece installing of finished product case ²),

N _iThe signal of detector output during on load operation (V or individual/second),

N _OThe signal of detector output when moving (V or individual/second) for blanking bar;

Step 102 when blanking bar moves, calibrates interior at certain time intervals detecting unit output signal N _iMean value N _Oi

Step 103 when the carrying row, calibrates at interval internal package box not under Short Item and two kinds of conditions of Short Item of certain hour respectively, the signal N of detecting unit output _iMean value N _I1(not Short Item) and N _I1' (Short Item); Described data acquisition control system is according to N _Oi, N _I1, N _I1', the calculated with mathematical model by described step 101 draws:

${\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="S200710145683XE00011.png,S200710145683XE00071.png"\; state="\{\{state\}\}">P</figure-callout>}}_1=\mathrm{Ln}\left(\frac{N_{i1}}{N_{01}}\right);$ ${\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="S200710145683XE00011.png,S200710145683XE00071.png"\; state="\{\{state\}\}">P</figure-callout>}}_1^{\&prime;}=\mathrm{Ln}\left(\frac{N_{i1}^{\&prime;}}{N_{01}}\right);$ P _{1 mark}=P-K (P ₁-P ₁');

In the formula: P _{1 mark}-criterion parameter is promptly judged finished product case Short Item whether standard,

P ₁-when packing case not during Short Item, the piece installing surface density that detecting unit is measured,

P ₁'-when the packing case Short Item, the piece installing surface density that detecting unit is measured,

K-selects coefficient

Above-mentioned detection method is characterized in that, described step 2 further comprises:

Step 201, data acquisition: when packing case moved to described position sensor, described detector sent signal, and data acquisition control system begins the signal of acquisition testing unit output and calculates the mean value N of at interval interior output signal detection time _i

Step 202, the N that described data acquisition control system is demarcated according to described step 102 _OiAnd the online N that records of described step 201 _i, calculate $P_i=\ln \frac{N_i}{N_{01}}.$

Above-mentioned detection method is characterized in that, described step 3 further comprises:

Step 301, the criterion parameter P definite according to described step 103 _{1 mark}And the resulting P of described step 202 _iJudge, work as P _i≤ P _{1 mark}The time, packing case not Short Item is judged as qualifiedly, works as P _i＞P _{1 mark}The packing case Short Item is judged as defective;

Step 302, when defective packing case moved to the rejecting position sensor, data acquisition control system sent the signal enabling device for eliminating, and defective packing case is rejected.

Compared with prior art, the present invention can bring following beneficial effect:

(1) compares with adopting the gamma-rays pick-up unit, owing to gamma-rays is produced by the radioactive atom nuclear decay, atomic nucleus is pressed it from regular decay, whether pipe unit work not to be, all ceaselessly produce gamma-rays, in case radioactive sources lost takes place or out of controlly may cause serious liability accident or cause personal injury in mismanagement.And the X ray that X-ray check device of the present invention sends, be the high-velocity electron beam bombardment anode target material that under condition of high voltage, forms and the X ray that inspires, add high pressure during device work and just produce X ray, device does not add high pressure when not working and just not produces X ray, as bulb, in case lose or the injury that also can not cause out of control, so the X-ray check device has higher-security to the person;

(2) the more gamma-ray energy of energy of the X ray of the present invention's employing is low, thereby the easier protection of X ray (shielding), causes the X ray leakage rate of X-ray check device frame outside to approach 0, and the dose rate of the outer ray of framework still keeps original natural background level;

(3) because the X ray energy is low than energy of, the X ray that causes the same substance of same weight to absorb is more than the gamma-rays that absorbs, thereby has higher sensitivity, has intact or to lack the accuracy of wrapping higher so the X-ray check device is judged;

(4) stream of X ray is strong increases high-voltage value with to be added between X-ray tube cathode-anode the high pressure size relevant, just can improve X ray intensity and signal/noise ratio, and can reduce statistic fluctuation influences, thereby the X-ray check device has advantages of higher stability.

Description of drawings

Fig. 1 a installs front elevational schematic for embodiment of the invention tobacco finished product lacks about the bar detecting unit;

Fig. 1 b installs schematic top plan view for embodiment of the invention tobacco finished product lacks about the bar detecting unit;

Fig. 2 lacks bar detecting unit device scheme of installation up and down for embodiment of the invention tobacco finished product;

Fig. 3 is an X-ray pipe synoptic diagram;

Fig. 4 a is a shielding protection plate front elevational schematic in the embodiment of the invention;

Fig. 4 b is a shielding protection plate schematic top plan view in the embodiment of the invention;

Fig. 5 a is a collimating plate front elevational schematic in the embodiment of the invention;

Fig. 5 b is a collimating plate A-A diagrammatic cross-section in the embodiment of the invention;

Fig. 6 a is a device for eliminating front elevational schematic in the embodiment of the invention;

Fig. 6 b is a device for eliminating schematic top plan view in the embodiment of the invention;

Fig. 7 a is a pick-up unit fair water fin front elevational schematic in the embodiment of the invention;

Fig. 7 b is a pick-up unit schematic top plan view in the inventive embodiments;

Fig. 8 is two X sources, 5 smoke box pick-up unit simplified schematic diagram that X-ray detector constitutes;

Fig. 9 a installs front elevational schematic about embodiment of the invention cigarette pack missing detector;

Fig. 9 b installs schematic top plan view about embodiment of the invention cigarette pack missing detector;

Figure 10 is an embodiment of the invention cigarette pack missing detector scheme of installation up and down;

Figure 11 is an embodiment of the invention detection method process flow diagram.

Wherein Reference numeral is:

1-X light-source box 2-X light source

21-filament 22-negative electrode

23-pipe shell 24-anode

25-target 26-ray emission window

The 3-web joint (on, 30-web joint (left side, the right side) down)

4-position sensor 5-smoke box

50-bar cigarette 6-X ray detector case

7-collimating plate 70-collimating aperture

8-X ray detector 9-shielding protection plate

10-data acquisition control system 11-conveying belt

13-position sensor 73-fair water fin

60-device for eliminating 61-support

62-driver 63-push rod

64-rejects the position sensor of slideway 65-device for eliminating

Embodiment

Further describe technical scheme of the present invention below in conjunction with drawings and Examples, with more detail knowledge the present invention's purpose, scheme and technique effect, but not as the restriction to the present invention's claim.

Fig. 1 a, Fig. 1 b and Fig. 2 have provided tobacco finished product and have lacked bar detection device.Fig. 1 a, Fig. 1 b are the synoptic diagram that X source, X-ray detector are installed in tested smoke box and arranged on left and right sides; Fig. 2 is the synoptic diagram that X source, X-ray detector are installed in the upper and lower both sides of tested smoke box.Be that example describes now with Fig. 1 a, Fig. 1 b.

Vertically be arranged in order into the five-element according to plume bar cigarette in smoke box 5, pick-up unit X source 2 quantity of present embodiment are 5, X-ray detector 8 quantity also are 5,5 X sources 2 are installed in the X source case 1,5 X-ray detectors 8 are installed in the X-ray detector case 6, and be arranged in order from top to bottom, the X source case places tested smoke box 5 left sides, the X-ray detector case places tested smoke box 5 right sides, on, lower connecting plate 3 is connected and fixed its X source case 1 and X-ray detector case 6 and constitutes a fixed frame, with respect to the conveying belt 11 of smoke box 5 across connecing on the conveyor that is installed in finished product packing.5 X sources 2 are corresponding one by one from top to bottom with 5 X-ray detectors 8, constitute 5 detecting units, and these 5 detecting units are aimed at the bar cigarette of arranging from top to bottom in the smoke box successively, so that detect.Also comprise data acquisition control system 10, it connects described X-ray detector 8 and position sensor 4 and 13 detection datas that receive described X-ray detector 8 and described position sensor 4 and 13 and carries out data processing and control signal is provided.

As shown in Figure 3, what this device was selected for use is the X source made from the X-ray pipe, and X source is made up of power-supply system, x ray generator and cooling device.X ray generator adopts X-ray pipe (the X-ray pipe is by filament 21, negative electrode 22, anode 24, pipe shell 23, target 25 and ray emission window 26).During device work, be added with several ten thousand volt high pressure at X-ray tube cathode 22 and 24 on anode, the electronics that negative electrode 22 is launched quickens to form high-velocity electron beam through high pressure, bombardment anode target material 25 just inspires X ray, after X ray window 26 penetrates, because it is bigger that anode 24 is subjected to electron bombard to produce heat, thus with cooling device to its cooling (if power abortion life heat is little, also not heating/cooling device).That cooling device can adopt usually is air-cooled, water-cooled or semiconductor refrigerating.The high pressure V that adds between the negative electrode of described X-ray pipe, anode is adjustable, changes high pressure V numerical value and just can change X ray intensity, in order to improve signal/noise ratio.

X-ray detector 8 can be selected scintillation counter or ionization chamber or proportional counter tube or G-M pipe for use.That in the present embodiment, it is selected for use is N _aThe I crystal scintillation counter, its N _aI crystal specification is φ 40*20.In the detector casing of 5 scintillation counter fronts (in the face of the X source direction), X ray collimating plate 7 is housed, its thickness is the 3mm stereotype, have φ 20 or φ 30 collimating apertures 70 (as Fig. 5 a, 5b) on the plate, the X ray that X source sends has only through collimating aperture 70 and could be received by X-ray detector 8, and all be blocked without the X ray of collimating aperture 70, can not be detected device 8 and receive.Shielding protection plate 9 (as Fig. 4 a, 4b) is equipped with in the X-ray detector back, this shielding protection plate is chosen steel plate or the stereotype that adequate thickness is arranged, it is the 3mm stereotype that present embodiment is selected thickness for use, is installed on the X-ray detector 8 rear case body plates, to guarantee the X ray shielding in framework.

The pick-up unit of present embodiment is furnished with two position sensors, and position sensor 4 is installed in the conveying belt both sides, is positioned at the detecting unit front, and position sensor 13 is installed in the detecting unit back, and two position sensors are all selected the photoelectric type position detector for use.Its objective is to be used for monitoring that smoke box enters the test section and leaves the test section, described position sensor is optional with photoelectric position detector or contact-making switch formula or automatically controlled stop means etc.

In the exit of pick-up unit framework device for eliminating 60 is installed also at this device, it comprises support 61, driver 62, push rod 63, rejects slideway 64 and position sensor 65, when the X-ray check device detects defective smoke box or bar cigarette, data acquisition control system 10 sends signal enabling device for eliminating 60, when smoke box 5 moves on to the position sensor 65 of device for eliminating, position sensor 65 promptly sends signal, starts device for eliminating driver 62, and push rod 63 is released defective smoke box outside the conveyor.Electronic or the pneumatic type of driver 62 optional usefulness of this device.

The data acquisition control system 10 of this device is selected the PLC of Siemens for use, S7-300, its have CPU, A/D, D/A open into, leave, modules such as numeral input and communication, and the TP-27 touch-screen is arranged.

Be smoke box or the diversed fixed position of bar cigarette that conveying belt 11 is carried to the test section, so that detecting unit is tested it, this device also comprises a smoke box or bar cigarette fair water fin 73, and this fair water fin is installed in conveying belt 11 tops of conveyor, and (sees Fig. 7 a, 7b) near the test section.

In order to reduce cost, can reduce X source quantity as one sees fit, as shown in Figure 8, adopt two X sources, 5 X-ray detectors constitute 5 detecting units, and cigarette bar box-missing is detected.

Fig. 9, Figure 10 have provided the embodiment of cigarette pack missing detector.Wherein, Fig. 9 is the synoptic diagram that an X source 2, an X-ray detector 8 are installed in bar cigarette 50 left and right sides; Figure 10 is the synoptic diagram that an X source 2, an X-ray detector 8 are installed in the upper and lower both sides of bar cigarette 50.The configuration of the configuration of cigarette pack missing detector and cigarette bar box-missing pick-up unit is identical, does not repeat them here.

In order to reach testing goal of the present invention, the present invention also provides a kind of cigarette bar box-missing, bar cigarette to lack the embodiment that wraps in line detecting method.Again in conjunction with Fig. 1 a, Fig. 1 b and Figure 11 set forth cigarette bar box-missing, the bar cigarette lacks the concrete detection method of bag below.

Demarcate in advance before step 1 detects, its step further comprises:

Step 101 is set up mathematical model, and five detecting unit mathematical models are:

${\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="S200710145683XE00011.png,S200710145683XE00071.png"\; state="\{\{state\}\}">P</figure-callout>}}_1=\mathrm{Ln}\left(\frac{\mathrm{Ni}1}{N01}\right)$

${\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="S200710145683XE00011.png,S200710145683XE00051.png"\; state="\{\{state\}\}">P</figure-callout>}}_2=\mathrm{Ln}\left(\frac{\mathrm{Ni}2}{N02}\right)$

${\mathrm{<figure-callout\; id="3"\; label="P"\; filenames="S200710145683XE00011.png,S200710145683XE00071.png"\; state="\{\{state\}\}">P</figure-callout>}}_3=\mathrm{Ln}\left(\frac{\mathrm{Ni}3}{N03}\right)$

${\mathrm{<figure-callout\; id="4"\; label="P"\; filenames="S200710145683XE00011.png,S200710145683XE00021.png"\; state="\{\{state\}\}">P</figure-callout>}}_4=\mathrm{Ln}\left(\frac{\mathrm{Ni}4}{N04}\right)$

${\mathrm{<figure-callout\; id="5"\; label="P"\; filenames="S200710145683XE00011.png,S200710145683XE00041.png"\; state="\{\{state\}\}">P</figure-callout>}}_5=\mathrm{Ln}\left(\frac{\mathrm{Ni}5}{N05}\right)$

In the formula: detector output signal when No-does not have smoke box (V or individual/second)

Detector output signal when Ni-has smoke box (V or individual/second)

P _i-detecting unit is measured the surface density (g/cm of bar cigarette ²)

Step 102 is demarcated the No of each detecting unit ₁, No ₂, No ₃, No ₄, No ₅(individual/second)

When no smoke box, the operation of conveying belt (machine) blanking bar, data acquisition control system is constantly gathered each detecting unit output signal Ni ₁, Ni ₂, Ni ₃, Ni ₄, Ni ₅, as measurement time t=60 second, recording corresponding 60 seconds Ni mean value of each detecting unit is No ₁=5000/second, No ₂=5100/second, No ₃=5150/second, No ₄=4995/second, No ₅=5010/second, each detecting unit No demarcates and finishes.

Step 103 standard model is demarcated, and determines criterion

The selected smoke box that does not lack bar that is equipped with, be placed on the conveying belt, start conveyor, when smoke box moves to photoelectric position detector 4, position sensor 4 sends signal, data acquisition control system 10 begins to gather the output signal Ni of 5 X-ray detectors 8, supposes measurement time t=10 second, surveys 10 seconds each detecting unit corresponding N i mean value and is: Ni ₁=3010/second, Ni ₂=3050/second, Ni ₃=3150/second, Ni ₄=3000/second, Ni ₅=3020/second.

Data acquisition control system 101 calculated with mathematical model that the provide Pi value that goes out each detecting unit set by step is:

${\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="S200710145683XE00011.png,S200710145683XE00071.png"\; state="\{\{state\}\}">P</figure-callout>}}_1=\mathrm{Ln}\left(\frac{{\mathrm{<figure-callout\; id="1"\; label="Ni"\; filenames="S200710145683XE00011.png,S200710145683XE00071.png"\; state="\{\{state\}\}">Ni</figure-callout>}}_1}{{\mathrm{No}}_1}\right)=\mathrm{Ln}\left(\frac{3010}{5000}\right)=-0.5074$

${\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="S200710145683XE00011.png,S200710145683XE00051.png"\; state="\{\{state\}\}">P</figure-callout>}}_2=\mathrm{Ln}\left(\frac{{\mathrm{<figure-callout\; id="2"\; label="Ni"\; filenames="S200710145683XE00011.png,S200710145683XE00051.png"\; state="\{\{state\}\}">Ni</figure-callout>}}_2}{{\mathrm{No}}_2}\right)=\mathrm{Ln}\left(\frac{3050}{5100}\right)=-0.5140$

${\mathrm{<figure-callout\; id="3"\; label="P"\; filenames="S200710145683XE00011.png,S200710145683XE00071.png"\; state="\{\{state\}\}">P</figure-callout>}}_3=\mathrm{Ln}\left(\frac{{\mathrm{<figure-callout\; id="3"\; label="Ni"\; filenames="S200710145683XE00011.png,S200710145683XE00071.png"\; state="\{\{state\}\}">Ni</figure-callout>}}_3}{{\mathrm{No}}_3}\right)=\mathrm{Ln}\left(\frac{3150}{5150}\right)=-0.4916$

${\mathrm{<figure-callout\; id="4"\; label="P"\; filenames="S200710145683XE00011.png,S200710145683XE00021.png"\; state="\{\{state\}\}">P</figure-callout>}}_4=\mathrm{Ln}\left(\frac{{\mathrm{<figure-callout\; id="4"\; label="Ni"\; filenames="S200710145683XE00011.png,S200710145683XE00021.png"\; state="\{\{state\}\}">Ni</figure-callout>}}_4}{{\mathrm{No}}_4}\right)=\mathrm{Ln}\left(\frac{3000}{4995}\right)=-0.5098$

${\mathrm{<figure-callout\; id="5"\; label="P"\; filenames="S200710145683XE00011.png,S200710145683XE00041.png"\; state="\{\{state\}\}">P</figure-callout>}}_5=\mathrm{Ln}\left(\frac{{\mathrm{<figure-callout\; id="5"\; label="Ni"\; filenames="S200710145683XE00011.png,S200710145683XE00041.png"\; state="\{\{state\}\}">Ni</figure-callout>}}_5}{{\mathrm{No}}_5}\right)=\mathrm{Ln}\left(\frac{3020}{5010}\right)=-0.5061$

Smoke box moves to photoelectric position detector 13 places, and position sensor sends signal, and smoke box shifts out the test section, and test finishes.

The smoke box of just having surveyed is taken off, opens smoke box, in corresponding cigarette ranks of each detecting unit, take out a cigarette, after smoke box is sealed, repeat above-mentioned steps, record the mean value of 10 seconds Ni of each detecting unit equally:

Ni ₁=4016/second, Ni ₂=4025/second, Ni ₃=4120/second, Ni ₄=4005/second, Ni ₅=4015/second.

Data acquisition system (DAS) is according to above-mentioned N _iMean value goes out the corresponding P of each detecting unit by calculated with mathematical model _i' be worth and be:

${\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="S200710145683XE00011.png,S200710145683XE00071.png"\; state="\{\{state\}\}">P</figure-callout>}}_1^{\&prime;}=\mathrm{Ln}\left(\frac{4016}{5000}\right)=-0.2191$

${\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="S200710145683XE00011.png,S200710145683XE00051.png"\; state="\{\{state\}\}">P</figure-callout>}}_2^{\&prime;}=\mathrm{Ln}\left(\frac{4025}{5100}\right)=-0.2267$

${\mathrm{<figure-callout\; id="3"\; label="P"\; filenames="S200710145683XE00011.png,S200710145683XE00071.png"\; state="\{\{state\}\}">P</figure-callout>}}_3^{\&prime;}=\mathrm{Ln}\left(\frac{4120}{5150}\right)=-0.2231$

${\mathrm{<figure-callout\; id="4"\; label="P"\; filenames="S200710145683XE00011.png,S200710145683XE00021.png"\; state="\{\{state\}\}">P</figure-callout>}}_4^{\&prime;}=\mathrm{Ln}\left(\frac{4005}{4995}\right)=-0.2208$

${\mathrm{<figure-callout\; id="5"\; label="P"\; filenames="S200710145683XE00011.png,S200710145683XE00041.png"\; state="\{\{state\}\}">P</figure-callout>}}_5^{\&prime;}=\mathrm{Ln}\left(\frac{4015}{5010}\right)=-0.2213$

Compare P ₁With P ₁' can draw a cigarette P _iThe size of value is:

ΔP ₁＝P ₁-P ₁′＝-0.5074-(-0.2191)＝-0.2883

ΔP ₂＝P ₂-P ₂′＝-0.5140-(-0.2267)＝-0.2773

ΔP ₃＝P ₃-P ₃′＝-0.4916-(-0.2231)＝-0.2685

ΔP ₁＝P ₄-P ₄′＝-0.5098-(-0.2208)＝-0.2890

ΔP ₁＝P ₁-P ₅′＝-0.5061-(-0.2213)＝-0.2848

Can determine that thus the standard that the scarce bar of each detecting unit is judged is:

P _{1 mark}=P ₁-K Δ P ₁

P _{2 marks}=P ₂-K Δ P ₁

P _{3 marks}=P ₁-K Δ P ₃

P _{4 marks}=P ₄-K Δ P ₄

P _{5 marks}=P ₅-K Δ P ₅

K is the coefficient less than 1 in the formula, and it can determine that K chooses usually according to smoke box bar cigarette weight deployment conditions between 0.3～0.7.As choose K=0.5, then criterion is:

Criterion is determined to finish.

Annotate: above-mentioned steps, data acquisition control system also can be gathered N one time _iCalculate once $P_i=\mathrm{Ln}\left(\frac{\mathrm{Ni}}{\mathrm{No}}\right),$ Draw P at last _iMean value; Determine the Δ P that adopts in the above-mentioned criterion _iAlso available full bar cigarette smoke box (is equipped with n bar cigarette-brand fixed (step 103) and draws P _iValue calculates Δ P=Pi/n.

The online detection of step 2

Each detecting unit is according to above-mentioned criterion P _MarkSmoke box in the production run is detected, judge whether to lack bar.

Step 201 data acquisition

Start conveying belt, when smoke box arrived photoelectric position detector 4, this detector sent signal, at this moment, data acquisition control system begins the output signal Ni of each detecting unit is gathered, and as acquisition time t=10 second, the mean value that records the Ni of each detecting unit is:

Ni ₁=3020/second

Ni ₂=3040/second

Ni ₃=3145/second

Ni ₄=4015/second

Ni ₅=4065/second

Step 202 data processing

Data acquisition control system is according to the Ni mean value calculation of gathering each detecting unit $P_i=\mathrm{Ln}\left(\frac{\mathrm{Ni}}{\mathrm{No}}\right)$ Value is:

$P_{1i}=\mathrm{Ln}\left(\frac{3020}{5000}\right)=-0.5042$

$P_{2i}=\mathrm{Ln}\left(\frac{3040}{5100}\right)=-0.5173$

$P_{3i}=\mathrm{Ln}\left(\frac{3145}{5150}\right)=-0.4931$

$P_{4i}=\mathrm{Ln}\left(\frac{4015}{4995}\right)=-0.2184$

$P_{5i}=\mathrm{Ln}\left(\frac{4065}{5010}\right)=-0.2090$

Step 3 judges whether qualified

Data acquisition control system is according to the P that calculates each detecting unit _iValue and P _MarkValue is compared, and judges P _iWhether value is greater than P _MarkValue is as P _iValue＞P _MarkValue then is defined as lacking bar.5 detecting units have a P _iValue＞P _MarkValue is just judged cigarette bar box-missing, is substandard product.

As previously mentioned,

P _1i=-0.5042＜P _{1 mark}=-0.3633 testing result does not lack bar

P _2i=-0.5173＜P _{2 marks}=-0.3754 testing result does not lack bar

P _3i=-0.4931＜P _{3 marks}=-0.3574 testing result does not lack bar

P _4i=-0.2184＞P _{4 marks}=-0.3653 testing result lacks bar

P _5i=-0.2090＞P _{5 marks}=-0.3637 testing result lacks bar

In view of the above, judge that this smoke box is that scarce bar is a substandard product.When smoke box moved to position sensor 13 places of device for eliminating, position sensor sent the signal enabling device for eliminating, and defective tobacco bale is rejected.

With reference to figure 9, Figure 10 is the cigarette pack missing detector synoptic diagram, and it is a special case of selecting 1 X source, 1 X-ray detector in the cigarette bar box-missing pick-up unit.In addition, the configuration of the configuration of cigarette pack missing detector and cigarette bar box-missing pick-up unit is identical, and its detection method too.No longer set forth at this.

Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; 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 (13)

1. a completed product packaging box short piece detecting apparatus is installed on the conveyor of finished product packing case, it is characterized in that, comprising:

At least one detecting unit, described each detecting unit comprises: at least one X source and at least one X-ray detector;

At least one position sensor, the conveying belt both sides that it is installed in conveyor are used to monitor packing case and enter/leave the test section, and output signal to data acquisition control system;

One data acquisition control system, it connects described X-ray detector and described position sensor, and control signal is handled and provided to the detection data that receives described X-ray detector and described position sensor.

2. pick-up unit according to claim 1 is characterized in that, also comprises an installation frame, is installed on the described conveying belt with respect to the conveying belt horizontal stroke of packing case/perpendicular cross-over connection, and this framework comprises:

One X source case is used to install described X source;

One X-ray detector case is used to install described X-ray detector;

Web joint is used to connect described X source case and X-ray detector case and constitutes framework.

3. pick-up unit according to claim 1 and 2 is characterized in that, also comprises a shielding protection plate, and it is installed in described X ray and surveys the interior X-ray detector back of case.

4. pick-up unit according to claim 1 and 2, it is characterized in that, also comprise a collimating plate, it is installed in described X ray and surveys the interior X-ray detector front of case, have the ray collimating aperture in the position of aiming at described X-ray detector, the X ray that X source sends is mapped on the X-ray detector through described collimating aperture.

5. pick-up unit according to claim 1, it is characterized in that, also comprise a device for eliminating, be installed in the exit of described conveying belt, this device for eliminating comprises: support, driver, push rod, rejecting slideway and position sensor, send and reject signal rear drive push rod defective packing case is rejected when described driver receives position sensor.

6. pick-up unit according to claim 1 is characterized in that, also comprises a fair water fin, is installed in described conveying belt top, is used for the fixed position of the packing case water conservancy diversion on the conveying belt to the test section.

7. pick-up unit according to claim 1, it is characterized in that described X source is made up of power-supply system, x ray generator and cooling system, described x ray generator adopts the X-ray pipe, the negative electrode and the high pressure between anode of described X-ray pipe are adjustable, in order to change X ray intensity.

8. pick-up unit according to claim 1 is characterized in that, described position sensor is selected photoelectric type position detector, touch switch, automatically controlled stop means for use.

9. pick-up unit according to claim 1 is characterized in that, described X-ray detector is scintillation counter or ionization chamber or proportional counter tube or G-M pipe.

10. the detection method of a completed product packaging box short piece is used to comprise it is characterized in that the pick-up unit of detecting unit, position sensor, data acquisition control system, comprising:

Step 1 is demarcated detected parameters in advance and is determined criterion: when non-packing box no-load running, demarcates the mean value of interior described detecting unit output signal at certain time intervals; There is being packing case load running markers to fix on the mean value of described detecting unit output signal in the certain hour interval; Calculate and determine criterion according to the secondary calibration result;

Step 2, online detection: under the production run condition, when packing case ran to the detection zone of detecting unit, described data acquisition control system detected packing case;

Step 3, Short Item are judged: compare according to described online testing result and described criterion, judgement the packing case of surveying Short Item whether.

11. detection method according to claim 10 is characterized in that, described step 1 further comprises:

Step 101 is set up the mathematical model of detecting unit $P_i=\mathrm{Ln}\left(\frac{\mathrm{Ni}}{N0}\right),$ Wherein:

P _iSurface density (g/cm for the piece installing of finished product case ²),

N _iThe signal of detector output during on load operation (V or individual/second),

N _OThe signal of detector output when moving (V or individual/second) for blanking bar;

Step 102 when blanking bar moves, calibrates interior at certain time intervals detecting unit output signal N _iMean value N _Oi

Step 103 when the carrying row, calibrates at interval internal package box not under Short Item and two kinds of conditions of Short Item of certain hour respectively, the signal N of detecting unit output _iMean value N _I1(not Short Item) and N _I1' (Short Item); Described data acquisition control system is according to N _Oi, N _I1, N _I1', the calculated with mathematical model by described step 101 draws:

$P_1=\mathrm{Ln}\left(\frac{N_{i1}}{N_{01}}\right);$ $P_1^{\&prime;}=\mathrm{Ln}\left(\frac{N_{i1}^{\&prime;}}{N_{01}}\right);$ P _{1 mark}=P-K (P ₁-P ₁');

In the formula: P _{1 mark}-criterion parameter is promptly judged finished product case Short Item whether standard,

P ₁-when packing case not during Short Item, the piece installing surface density that detecting unit is measured,

P ₁'-when the packing case Short Item, the piece installing surface density that detecting unit is measured,

K-selects coefficient, K=0.3～0.7

12., it is characterized in that described step 2 further comprises according to claim 10 or 11 described detection methods:

Step 201, data acquisition: when packing case moved to described position sensor, described detector sent signal, and data acquisition control system begins the signal of acquisition testing unit output and calculates the mean value N of at interval interior output signal detection time _i

Step 202, the N that described data acquisition control system is demarcated according to described step 102 _OiAnd the online N that records of described step 201 _i, calculate $P_i=\ln \frac{N_i}{N_{01}}.$

13. detection method according to claim 12 is characterized in that, described step 3 further comprises:

Step 301, the criterion parameter P definite according to described step 103 _{1 mark}And the resulting P of described step 202 _iJudge, work as P _i≤ P _{1 mark}The time, packing case not Short Item is judged as qualifiedly, works as P _i＞P _{1 mark}The packing case Short Item is judged as defective;

Step 302, when defective packing case moved to the rejecting position sensor, data acquisition control system sent the signal enabling device for eliminating, and defective packing case is rejected.

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