CN103557807A - Method and device for detecting quality of cigarette filter stick end face shape - Google Patents
Method and device for detecting quality of cigarette filter stick end face shape Download PDFInfo
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- CN103557807A CN103557807A CN201310550177.4A CN201310550177A CN103557807A CN 103557807 A CN103557807 A CN 103557807A CN 201310550177 A CN201310550177 A CN 201310550177A CN 103557807 A CN103557807 A CN 103557807A
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Abstract
The invention discloses a method and device for detecting the quality of cigarette filter stick end face shapes. At the tail end of the filter stick production, two high-speed cameras on which high-precision calibration is carried out in advance are used for sequentially imaging the end faces of filter sticks in turn, and the images are analyzed and measured through a computer and the software of the computer; the concentricity of the center of filter stick cavity patterns and the center of the outer circles of the filter sticks, the similarity of the filter stick cavity patterns and a standard pattern, the circular degree of the outer circles of the filter sticks and broken filaments and notches of the filter stick cavity patterns and the outer circles of the filter sticks are measured; whether the filter sticks are qualified or not is judged according to the measurement result and the detection standard; the inferior-quality filter sticks are removed on line. The method and device for detecting the quality of the cigarette filter stick end face shapes have the advantages that the degree of automation is high; on-line detection is carried out in a real-time and high-speed mode, and the inferior-quality filter sticks are removed on line; the precision is high, and the repeated measuring precision reaches to 0.01mm; no damage or stain is caused to the filter sticks due to non-contact; all measuring data of parameters of the cigarette filter stick end face shapes are obtained, and the data can be rechecked; the method and the device are also suitable for detecting the appearance shapes of other filter stick end faces and the appearances of the end face of cigarettes.
Description
Technical field
The present invention relates to cigarette filter stick end face appearance quality detection and machine vision metrology field, concrete is in the production link of cigarette filter rod, producing end by optical, mechanical and electronic integration device, adopt machine vision contactless measurement, the online filter stick of detection in real time end face apparent parameter, and reject online substandard products filter stick.
Background technology
Visual performance composite filter is a kind of binary compound filter candle, gives on the one hand when consumer's pleasure of the senses (vision, mouthfeel) is enjoyed also to give consumer's low tar the low guarantee that endangers safety.Its form of expression variation can be into lip end, to adopt the filter section of vision novel, as cylinder blank pipe, pattern and character cavity, groove, fragrant line etc.
The principal feature of visual performance composite filter is: the outward appearance of accurate shape, novelty, is conducive to the visual enjoyment to consumer.And due to manufacturing process aspect, be difficult to produce, at present domestic only have the use of high-end cigarette, and filter stick mainly relies on import.
Visual performance composite filter is due to many-sided reasons such as manufacturing process and the features of product own, the product of producing inevitably can produce certain defect, defect kind mainly comprises: the filter stick cavity pattern centre of form and cylindrical center of circle decentraction, the distortion of filter stick cavity pattern form, cylindrical out-of-roundness is high, and filter stick cavity pattern or cylindrical produce lousiness, breach etc.
Domestic on this kind of filter stick end face outward appearance detects at present also in blank, faulty goods is detected and can only rely on artificial screening.
At present existing filter stick excircle and roundness measurement method are mainly adopted to laser ranging, by filter stick, before laser range sensor, rotate a circle, continuous coverage filter stick and sensor distance, thus measure filter-rod periphery and circularity.This kind of method is difficult to realize detection for filter stick cavity pattern.
At cigarette quality detection field, the more existing detection method based on machine vision, is mainly that visual examination is carried out in a certain part of cigarette body.But end face is not carried out method or the equipment of outward appearance detection.
Artificial screening mainly depends on visual inspection, exists indefinite, the easy erroneous judgement of standard, inefficiency, labor strength greatly, easily to produce the inferior positions such as secondary pollution and damage.And current existing automated detection method is difficult to realize filter stick cavity pattern detection, and traditional contact measurement method is difficult to realize online high speed detection.
Summary of the invention
The present invention is a kind of method and device thereof of the cigarette filter rod end surface shape quality testing based on machine vision metrology technology.Be intended to realize full-automatic online detection of cigarette filter rod end surface shape, reject substandard products filter stick, detection speed is greater than 2500/minute.Obtain the end surface shape supplemental characteristic of whole produced filter sticks, for front end production equipment improves technique and produces the data supporting that debugging provides scientific and precise simultaneously.
Method of the present invention;
At filter stick, produce end, use two high-speed cameras that carry out in advance high-precision calibrating to the capture in turn of filter stick end face, by computing machine and software thereof, carry out graphical analysis and measurement; Measure concentricity, filter stick cavity pattern and standard pattern similarity, the filter stick roundness of external circle in the filter stick cavity pattern centre of form and the filter stick cylindrical center of circle, and lousiness and the breach of filter stick cavity pattern, filter stick cylindrical; By measurement result, in conjunction with examination criteria, judge that whether filter stick is qualified; The online substandard products filter stick of rejecting.
Method of the present invention, step is as follows:
1) camera calibration:
Under system-down state, carry out, use length and width to be the gridiron pattern scaling board of a millimeter, total bXb chequered with black and white chequer in scaling board, each grid size c millimeter, demarcation dish machining precision d millimeter, is placed on scaling board in transmittance process on filter stick end face position, and software extracts X-comers, the row iteration of going forward side by side is resolved, by calculating the Transformation Relation of Projection P between the flat picture of image and measurement plane;
Above-mentioned a=8, b=11, c=0.5, d=0.001;
2) filter stick regular with transmit:
Paging wheel and filter stick production equipment end on, the filter stick that production equipment is produced enters the groove on paging wheel wheel successively, with air pressure, filter stick is blown to paging wheel front end, the locating ring of taking turns front end by paging makes filter stick end face position neat, negative pressure device on paging wheel groove holds filter stick, and be delivered to a drum of taking pictures, reject position drum and rewinding drum, above-mentioned three drums obtain different negative pressure in different positions in the process of rotating, filter stick in the rotation of above-mentioned three drums due to the existence of Negative Pressure Difference, make filter stick can be in above-mentioned three drums direct high-speed transfer,
3) filter stick end face capture:
On a drum of taking pictures, photoelectric code disk is installed, every rotation certain position, to the data acquisition card on principal computer, send a signal, two high- speed cameras 1,2 are arranged on respectively applicable position, this place, position drum circumferential position of taking pictures is known when mechanical erection, and when odd indexed filter stick turns to high-speed camera 1 position, principal computer sends capture signal to high-speed camera 1; When even number sequence number filter stick turns to high-speed camera 2 position, principal computer sends capture signal to high-speed camera 2, realizes two high-speed cameras the abortive lot of filter stick contrate wheel is shone; Adopting 2 high-speed camera reasons is that single high-speed camera is difficult to meet detection speed requirement;
4) filter stick end face graphical analysis:
Principal computer is to step 3) the filter stick end view drawing picture that obtains, adopt sub-pix profile extractive technique, by image smoothing filtering technique, image binaryzation, rim detection, edge connect, the step such as edge shade of gray calculates, edge sub-pixel is accurately located, the rejecting of noise profile obtains filter stick end face excircle configuration and filter stick cavity pattern contour;
Profile carries out ellipse fitting and obtains the center of circle and girth to foreign round, and filter stick cavity pattern contour is calculated to the centre of form and main shaft, analyzes excircle configuration center of circle out-of-roundness; Analyze the concentricity of the excircle configuration center of circle and the cavity pattern centre of form; Analyze filter stick cavity pattern and standard pattern similarity; Analyze lousiness and the breach of filter stick cavity pattern and filter stick cylindrical;
5) parameter measurement and substandard products judgement:
The flat picture of image that take that step 4) the is obtained characteristics of image that image pixel is unit and step 1) obtain and the Transformation Relation of Projection P between measurement plane, comprehensively obtain characteristics of image and take the parameter that millimeter is unit; According to the examination criteria of setting in advance, judge that whether filter stick is qualified again, by filter stick sequence number and each transverse parameters and the information write into Databasce such as qualified whether, be kept at buffer zone simultaneously;
6) substandard products are rejected online:
Filter stick continues to be delivered to a rejecting position drum, reject position drum and have negative pressure device for eliminating, filter stick is delivered to rejects position, principal computer is according to rejecting position filter stick sequence number, in buffer zone, whether inquiry is qualified, send instruction and reject defective filter stick to controlling device for eliminating, buffer zone array is carried out to shifting function simultaneously;
Electric signal by light-coupled isolation after, through the amplification of IGBT, high-frequency electromagnetic valve, at the electric signal that receives industrial computer and send, is opened rapidly valve, pressure-air moment is the removing filter-stick of opposite position;
7) certified products rewinding:
To being judged as the filter stick of certified products, be transmitted into rewinding drum, enter material receiving desk, complete rewinding.
Mechanical hook-up part of the present invention:
Apparatus of the present invention comprise mechanism's installing plate, mechanism's installing plate is close to filter stick end production equipment, paging wheel, a drum of taking pictures are installed on mechanism's installing plate successively, reject position drum, rewinding drum, material receiving desk and switch cabinet six major parts, vision module group unit is connected with a drum of taking pictures, reject on the drum of position and have filter stick transmission and device for eliminating, paging wheel is responsible for receiving filter stick and realize filter stick regular from filter stick end production equipment; Vision module group unit is responsible for vision and is adopted picture and analyze; Filter stick transmission and device for eliminating are responsible for high-speed transfer and the rejecting of filter stick; Rewinding drum, material receiving desk are for finished product rewinding; Switch cabinet mainly comprises circuit devcie and the computing machine of this device.
Paging wheel and filter stick production equipment end on, on the circumference of paging wheel, be distributed with groove longitudinally, the filter stick that production equipment is produced enters the groove on paging wheel successively, with air pressure, filter stick is blown to paging wheel front end, paging wheel front end is provided with locating ring, locating ring makes filter stick end face position neat, and the negative pressure device on paging wheel groove holds filter stick, and is delivered to a drum of taking pictures; Take pictures in a drum 2 high speed cameras and camera adjusting mechanism are installed, a drum side of taking pictures is provided with and rejects a position drum, reject drum side, position rewinding drum and receiving mechanism are installed, end at a drum of taking pictures, rejecting position drum and rewinding drum is provided with negative pressure channel, negative pressure channel communicates with the negative pressure device on above-mentioned three drum wheel grooves, negative pressure device on each drum wheel groove holds filter stick, and is delivered to successively next drum.
Circuit part of the present invention
Main circuit connects the industrial power of 4 line 3 phase 380V, and industrial computer control power supply, Switching Power Supply, conveying belt, light source controller are used respectively independently air switch; Input signal at industrial computer adopts light-coupled isolation, and the 24V signal of photoelectric code disk is converted to 5V signal input industrial computer; The 5V output signal of industrial computer, after output through light-coupled isolation, the 24V that is amplified to by IGBT controls solenoid valve, alarm again; The 24V power supply of input and output isolation amplification board comes from Switching Power Supply.
The flow process of software program of the present invention:
Software program, for reaching the requirement of high speed detection efficiency, is used multithreading and event-driven technology;
System creates four threads after starting, and its thread 1 is for checking photoelectric code disk back to zero signal sum counter signal; Thread 2 is for video camera 1 capture and analysis; Thread 3 is for video camera 2 captures and analysis; Thread 4 is for interface display and result output;
When detecting a drum of taking pictures, thread 1 rotates a groove location, with event notice thread 2; Rotate again a groove location, with event notice thread 3; Continuous circulation realizes thread 2,3 and responds in turn; Thread 2 and thread 3 are controlled respectively video camera 1, the capture of video camera 2, analysis, judgement, record;
Array of software creation, each filter stick is delivered to some drums, in array, since 0, is that it is numbered, and capture and analysis result are all recorded in the array of corresponding numbering; Groove location of the every rotation of a drum of taking pictures, array is shifted one; The each back to zero of photoelectric code disk, a drum of taking pictures rotates a circle, and corresponding array sequence number gets back to 0, and the sequence number that realizes filter stick with this is followed the tracks of;
Using method of the present invention or operating process:
1) the system start that powers on;
2) start software;
3) be 1-6 month at set intervals, demarcate video camera No. one time;
4) set the examination criteria of each parameter item;
5) click " starting working ";
6) the filter stick vanning of material receiving desk will be entered.
Advantage of the present invention:
1) automaticity is high;
2) detect in real time, at a high speed, online, substandard products are rejected online;
3) high precision, duplicate measurements precision reaches 0.01mm;
4) noncontact, does not produce any damage and pollution to product;
5) obtain the whole measurement data of filter stick end surface shape parameter, data can be returned and be looked into, for front end production equipment process modification debugs with producing the data supporting that scientific and precise is provided;
6) this programme detects for filter stick end face cavity pattern and cylindrical parameter, but content of the present invention is applicable equally for the detection of other filter stick end face face shapings and cigarette end face outward appearance.
Accompanying drawing explanation
Fig. 1 is overall structural arrangement figure of the present invention
In figure, 1, paging wheel, 2, filter stick transmission and device for eliminating, 3, material receiving desk, 4, switch cabinet, 43, filter stick end production equipment, 44, vision module group unit;
Fig. 2-1,2-2 are circuit diagrams of the present invention
Fig. 3 is software flow block diagram of the present invention
Fig. 4 is software architecture diagram of the present invention
Fig. 5-1st, filter stick transmission and ordered structure vertical view
Fig. 5-2nd, filter stick transmission and ordered structure front view
In figure, 1, paging wheel, 5, locating ring, 6, a drum of taking pictures, 7, reject a position drum, 8, rewinding drum, 9, receiving mechanism, 10, negative pressure channel ，11, mechanism installing plate;
Fig. 6 is three drum wheel grooves and negative-pressure adsorption section of structure
In figure: 12, centring ring, 13, gear case, 14, back-up ring, 15, the transmission cover that slows down, 16, cabinet shell, 17, angular contact bearing, 18, rotating spindle, 19, rotate back-up ring, 20, transfer wheel, 21, zanjon bearing, 22, locating ring, 23, main shaft bearing, 24, main shaft fixed cover, 25, main shaft orientation ring, 26, main shaft distance bushing, 27, main shaft back-up ring, 28, bearing inner sleeve, 29, front-end of spindle bearing;
Fig. 7 is high-speed camera unit and three drum-wheel structure vertical views
In figure, 7, reject a position drum, 8, rewinding drum, 30, main shaft shell, 31, shaft coupling, 32, photoelectric code disk, 33, camera lens, 34, camera, 35, camera adjustments seat;
Fig. 8 rejects position drum-wheel structure figure
In figure, 36, plate after transmission case body, 37, reject a position bearing, 38, inner sleeve, 39, drum bearing, 40, reject a position stationary shaft, 41, reject air channel, 42, bearing cover;
Fig. 9 is Camera Calibration Algorithm process flow diagram
Figure 10 is filter stick end surface shape parameter measurement algorithm flow chart
embodiment
As follows to the detailed description of the invention below in conjunction with accompanying drawing:
In Fig. 1, Fig. 5-1 and 5-2, apparatus of the present invention comprise mechanism's installing plate 11, mechanism's installing plate 11 is close to filter stick end production equipment 43, paging wheel 1, the drum 6 of taking pictures are installed on mechanism's installing plate 11 successively, reject position drum 7, rewinding drum 8, material receiving desk 3 and switch cabinet 4 six major parts, vision module group unit 44 is connected with the drum 6 of taking pictures, reject on the drum 7 of position and have filter stick transmission and device for eliminating 2, paging wheel 1 is responsible for receiving filter stick and realize filter stick regular from filter stick end production equipment 43; Vision module group unit 44 is responsible for vision and is adopted picture and analyze; Filter stick transmits high-speed transfer and the rejecting of being responsible for filter stick with device for eliminating 2; Rewinding drum 8, material receiving desk 3 are for finished product rewinding; Switch cabinet 4 mainly comprises circuit devcie and the computing machine of this device.
Paging wheel 1 docks with filter stick production equipment front end production equipment 43, on the circumference of paging wheel 1, be distributed with groove longitudinally, the filter stick that production equipment is produced enters the groove on paging wheel 1 successively, with air pressure, filter stick is blown to paging and take turns 1 front end, paging is taken turns 1 front end locating ring 5 is installed, locating ring 5 makes filter stick end face position neat, and the negative pressure device that paging is taken turns on 1 groove holds filter stick, and is delivered to the drum 6 of taking pictures; Take pictures in a drum 62 high speed cameras and camera adjusting mechanism are installed, a drum 6 sides of taking pictures are provided with and reject a position drum 7, reject drum 7 sides, position rewinding drum 8 and receiving mechanism 9 are installed, end at the drum 6 of taking pictures, rejecting position drum 7 and rewinding drum 8 is provided with negative pressure channel 10, negative pressure channel 10 communicates with the negative pressure device on above-mentioned three drum wheel grooves, negative pressure device on each drum wheel groove holds filter stick, and is delivered to successively next drum.
Fig. 6 is three drum wheel grooves and negative-pressure adsorption section of structure
Paging wheel 1 docks with filter stick end production equipment 43, and the drum 6 of taking pictures is installed successively, rejects a position drum 7, rewinding drum 8, on the drum 6 of taking pictures, the end of transmission main shaft 18 is provided with centring ring 12, cabinet shell 16 is installed on centring ring 12, in cabinet shell 16, there are successively gear case 13 and back-up ring 14, by angular contact bearing 17, the transmission cover 15 that slows down are installed, at the other end of transmission main shaft 18, by rotating back-up ring 19, transfer wheel 20 is installed; Centre is to reject position drum 7; Being close to is rewinding drum 8, rewinding drum 8 is rack-mount by zanjon bearing 21, rewinding drum 8 centers are main shafts, on main shaft is longitudinal, locating ring 22, main shaft bearing 23, main shaft orientation ring 25, main shaft back-up ring 27, bearing inner sleeve 28 and front-end of spindle bearing 29 are installed successively, main shaft diameter is upwards overlapped and is had main shaft distance bushing 26 and main shaft fixed cover 24 successively.
Transmission main shaft 18 is fixing, power section is slowed down and is overlapped 15 by transmission after being come by equipment dynamic gear transmission, the drum 6 of taking pictures is given in transmission respectively, reject position drum 7, rewinding drum 8, in above-mentioned three drums, drum high-speed rotation, air enters by the aperture of surface of tub wheel, produce negative pressure, the transmission shaft of drum the inside has space, the relative transmission shaft of rotation of drum has produced different negative pressure, filter tip is by the negative pressure adhesive of drum, three drums are when rotating, there is each other Negative Pressure Difference, filter stick is delivered to another one drum from a drum under the Negative Pressure Difference effect between drum, paging wheel and filter stick production equipment end on, the filter stick that production equipment is produced enters the groove on paging wheel successively, with air pressure, filter stick is blown to drum front end, the locating ring of taking turns front end by paging makes filter stick end face position neat, negative pressure device on drum wheel groove holds filter stick, and be delivered to a drum of taking pictures, reject position drum and rewinding drum.
Fig. 7 is high-speed camera unit and three drum-wheel structure vertical views.
Vision module group unit comprises camera adjustments seat 35, two identical cameras 34 are installed on camera adjustments seat 35, the front end of camera is fixed with camera lens 33, there is photoelectric code disk 32 front portion of camera lens 33, photoelectric code disk 32 is connected with the drum 6 of taking pictures by shaft coupling 31, annular light source is near the end face of the drum 6 of taking pictures, camera adjustments seat 35 regulates camera 34 to make camera lens 33 centers aim at annular light source interstitial hole center, transmitted signal often turns an angle in rotation process, the drum 6 of taking pictures is connected with paging wheel 1 on one side, and another side is connected with a rejecting position drum 7.
Fig. 8 is device for eliminating structural drawing
In the middle of rejecting position drum 7, be fixed with a rejecting position stationary shaft 40, rejecting position stationary shaft 40 is tubular shafts, reject on the stationary shaft 40 of position and have inner sleeve 38, rejecting a position stationary shaft 40 is fixed on after transmission case body on plate 36, reject stationary shaft 40 middle parts, position, by rejecting position bearing 37 and drum bearing 39, rejecting position drum 7 is installed, the end of rejecting position stationary shaft 40 is provided with bearing cover 42, rejects in the drum 7 of position and has the air channel 41 of rejecting; Power passes to and rejects position drum 7 from mainshaft gear, negative pressure air enters from rejecting the aperture on drum 7 surfaces, position, through inner sleeve, take away, thereby produced the negative pressure of rejecting drum 7 surfaces, position, when substandard products filter tip forwards to, rejected position, industrial computer sends signal, open high-frequency electromagnetic valve, pressure-air enters drum 7 inside, rejecting position through rejecting air channel 41, and moment, pressure-air blew away substandard products filter tip the negative pressure destruction of rejecting the rejecting position of position drum 7.
Fig. 2-1,2-2 are circuit diagrams of the present invention:
Main circuit connects industrial power 4 line 3 phases, and industrial computer control power supply, Switching Power Supply, conveying belt, light source controller are used respectively independently air switch; Input signal at industrial computer adopts light-coupled isolation, and the 24V signal of photoelectric code disk is converted to 5V signal input industrial computer; The 5V output signal of industrial computer, after output after light-coupled isolation again by the 24V that is amplified to of IGBT, control solenoid valve, alarm; The 24V power supply of input and output isolation amplification board comes from Switching Power Supply.
Fig. 3 is software flow block diagram of the present invention: filter stick end surface shape quality detecting system software is mainly comprised of 4 threads, and its thread 1 is for checking photoelectric code disk back to zero signal sum counter signal; Thread 2 is for video camera 1 capture and analysis; Thread 3 is for video camera 2 captures and analysis; Thread 4 is for interface display and result output.The specific works mode of 4 threads is as follows:
1) after system starts, thread 2,3 is in waiting for the state of the event of taking pictures, and thread 1 starts to check the turn signal of photoelectric code disk, reads code-disc pulse;
2) thread 1 detects drum and rotates a groove location, triggers the event of taking pictures of thread 2, then rotates a groove location, triggers the event of taking pictures of thread 3;
3) thread 2,3 is being received overly according to after event, controls camera acquisition, obtains collection image, carries out analysis of image data record analysis result to data buffer, then the circular wait event of next time taking pictures;
4) thread 1 checks data buffer, searches current rejecting position filter stick parameter, judges whether to reject, and carries out corresponding mechanism controls;
5) 1 pair of data buffer records data displacement of thread, simultaneously with event notice thread 1;
6) thread 1 counting statistics data, save data enters database, upgrades interface display;
7) flow process 2-6 circulation;
8) manually click stop button on interface, software quits work.
Fig. 4 is software architecture diagram of the present invention: filter stick end surface shape quality detecting system software mainly comprises: camera calibration module, for camera calibration; Image capture module, controls for camera review collection; Image analysis module, for analysis of image data; Electromechanical Control module, controls for electromechanical structure; Parameter setting module, carries out setting parameter and the management such as examination criteria for user; System debug module, for user's debugging, examination device fault; Interface display module, display video image and necessary examination criteria, measurement result statistical information etc. on interface.
Fig. 9 is Camera Calibration Algorithm process flow diagram: camera marking method is used length and width to be the gridiron pattern scaling board of 8 millimeters, total 11X11 chequered with black and white chequer in scaling board, after camera is taken pictures to scaling board, software extracts X-comers, by volume coordinate and the image coordinate of angle point, resolve the Transformation Relation of Projection P;
Resolve flow process as follows:
1) by projection equation's formula, take each angle point volume coordinate and image coordinate is known number, and the P of take sets up system of linear equations, linear solution P as unknown number;
2) from P, decompose the inside and outside parameter of video camera that comprises error
3) set up the inside and outside parametrical nonlinearity system of equations of video camera.Utilize least square Iterative Nonlinear System of Equations
4) set up video camera aberration system equation group, solve aberration system
5) 3-4 convergence, algorithm finishes, otherwise circulation 3-4.
Figure 10 is filter stick end surface shape parameter measurement algorithm flow chart: camera acquisition obtains after an image, through image smoothing filtering technique, image binaryzation, whole pixel profile extract, sub-pix profile is accurately located, noise profile is rejected, image coordinate is to steps such as physical coordinates conversion, profile analysis, calculation of parameter, completes filter stick end face excircle configuration and filter stick cavity pattern analysis.
Claims (13)
1. the method for cigarette filter rod end surface shape quality testing, is characterized in that, at filter stick, produces end, uses two high-speed cameras that carry out in advance high-precision calibrating to the capture in turn of filter stick end face, by computing machine and software thereof, carries out graphical analysis and measurement; Measure concentricity, filter stick cavity pattern and standard pattern similarity, the filter stick roundness of external circle in the filter stick cavity pattern centre of form and the filter stick cylindrical center of circle, and lousiness and the breach of filter stick cavity pattern, filter stick cylindrical; By measurement result, in conjunction with examination criteria, judge that whether filter stick is qualified; The online substandard products filter stick of rejecting.
2. the method for cigarette filter rod end surface shape according to claim 1 quality testing, is characterized in that, the step of detection is as follows:
1) camera calibration:
Under system-down state, carry out, use length and width to be the gridiron pattern scaling board of a millimeter, total bXb chequered with black and white chequer in scaling board, each grid size c millimeter, demarcation dish machining precision d millimeter, is placed on scaling board in transmittance process on filter stick end face position, and software extracts X-comers, the row iteration of going forward side by side is resolved, by calculating the Transformation Relation of Projection P between the flat picture of image and measurement plane;
2) filter stick regular with transmit:
Paging wheel and filter stick production equipment end on, the filter stick that production equipment is produced enters the groove on paging wheel wheel successively, with air pressure, filter stick is blown to paging wheel front end, the locating ring of taking turns front end by paging makes filter stick end face position neat, negative pressure device on paging wheel groove holds filter stick, and be delivered to a drum of taking pictures, reject position drum and rewinding drum, above-mentioned three drums obtain different negative pressure in different positions in the process of rotating, filter stick in the rotation of above-mentioned three drums due to the existence of Negative Pressure Difference, make filter stick can be in above-mentioned three drums direct high-speed transfer,
The capture of filter stick end face:
On a drum of taking pictures, photoelectric code disk is installed, every rotation certain position, to the data acquisition card on principal computer, send a signal, two high-speed cameras 1,2 are arranged on respectively applicable position, this place, position drum circumferential position of taking pictures is known when mechanical erection, and when odd indexed filter stick turns to high-speed camera 1 position, principal computer sends capture signal to high-speed camera 1; When even number sequence number filter stick turns to high-speed camera 2 position, principal computer sends capture signal to high-speed camera 2, realizes two high-speed cameras the abortive lot of filter stick contrate wheel is shone; Adopting 2 high-speed camera reasons is that single high-speed camera is difficult to meet detection speed requirement;
The graphical analysis of filter stick end face:
Principal computer is to step 3) the filter stick end view drawing picture that obtains, adopt sub-pix profile extractive technique, by image smoothing filtering technique, image binaryzation, rim detection, edge connect, the step such as edge shade of gray calculates, edge sub-pixel is accurately located, the rejecting of noise profile obtains filter stick end face excircle configuration and filter stick cavity pattern contour;
Profile carries out ellipse fitting and obtains the center of circle and girth to foreign round, and filter stick cavity pattern contour is calculated to the centre of form and main shaft, analyzes excircle configuration center of circle out-of-roundness; Analyze the concentricity of the excircle configuration center of circle and the cavity pattern centre of form; Analyze filter stick cavity pattern and standard pattern similarity; Analyze lousiness and the breach of filter stick cavity pattern and filter stick cylindrical;
Parameter measurement and substandard products judgement:
The flat picture of image that take that step 4) the is obtained characteristics of image that image pixel is unit and step 1) obtain and the Transformation Relation of Projection P between measurement plane, comprehensively obtain characteristics of image and take the parameter that millimeter is unit; According to the examination criteria of setting in advance, judge that whether filter stick is qualified again, by filter stick sequence number and each transverse parameters and the information write into Databasce such as qualified whether, be kept at buffer zone simultaneously;
Substandard products are rejected online:
Filter stick continues to be delivered to a rejecting position drum, reject position drum and have negative pressure device for eliminating, filter stick is delivered to rejects position, principal computer is according to rejecting position filter stick sequence number, in buffer zone, whether inquiry is qualified, send instruction and reject defective filter stick to controlling device for eliminating, buffer zone array is carried out to shifting function simultaneously;
Electric signal by light-coupled isolation after, through the amplification of IGBT, high-frequency electromagnetic valve, at the electric signal that receives industrial computer and send, is opened rapidly valve, pressure-air moment is the removing filter-stick of opposite position;
Certified products rewinding:
To being judged as the filter stick of certified products, be transmitted into rewinding drum, enter material receiving desk, complete rewinding.
3. the method for cigarette filter rod end surface shape according to claim 2 quality testing, is characterized in that, a=8, b=11, c=0.5, d=0.001.
4. the device of cigarette filter rod end surface shape quality testing, it is characterized in that, comprise mechanism's installing plate, mechanism's installing plate is close to filter stick end production equipment, paging wheel, a drum of taking pictures are installed on mechanism's installing plate successively, reject position drum, rewinding drum, material receiving desk and switch cabinet six major parts, vision module group unit is connected with a drum of taking pictures, and rejects on the drum of position and has filter stick transmission and device for eliminating, and paging wheel is responsible for receiving filter stick and realize filter stick regular from filter stick end production equipment; Vision module group unit is responsible for vision and is adopted picture and analyze; Filter stick transmission and device for eliminating are responsible for high-speed transfer and the rejecting of filter stick; Rewinding drum, material receiving desk are for finished product rewinding; Switch cabinet mainly comprises circuit devcie and the computing machine of this device;
Paging wheel and filter stick production equipment end on, on the circumference of paging wheel, be distributed with groove longitudinally, the filter stick that production equipment is produced enters the groove on paging wheel successively, with air pressure, filter stick is blown to paging wheel front end, paging wheel front end is provided with locating ring, locating ring makes filter stick end face position neat, and the negative pressure device on paging wheel groove holds filter stick, and is delivered to a drum of taking pictures; Take pictures in a drum 2 high speed cameras and camera adjusting mechanism are installed, a drum side of taking pictures is provided with and rejects a position drum, reject drum side, position rewinding drum and receiving mechanism are installed, end at a drum of taking pictures, rejecting position drum and rewinding drum is provided with negative pressure channel, negative pressure channel communicates with the negative pressure device on above-mentioned three drum wheel grooves, negative pressure device on each drum wheel groove holds filter stick, and is delivered to successively next drum.
5. the device of cigarette filter rod end surface shape according to claim 3 quality testing, it is characterized in that, circuit devcie comprises that main circuit connects the industrial power of 4 line 3 phase 380V, and industrial computer control power supply, Switching Power Supply, conveying belt, light source controller are used respectively independently air switch; Input signal at industrial computer adopts light-coupled isolation, and the 24V signal of photoelectric code disk is converted to 5V signal input industrial computer; The 5V output signal of industrial computer, after output through light-coupled isolation, the 24V that is amplified to by IGBT controls solenoid valve, alarm again; The 24V power supply of input and output isolation amplification board comes from Switching Power Supply.
6. the method for cigarette filter rod end surface shape according to claim 1 quality testing, is characterized in that,
Software program, for reaching the requirement of high speed detection efficiency, is used multithreading and event-driven technology;
System creates four threads after starting, and its thread 1 is for checking photoelectric code disk back to zero signal sum counter signal; Thread 2 is for video camera 1 capture and analysis; Thread 3 is for video camera 2 captures and analysis; Thread 4 is for interface display and result output;
When detecting a drum of taking pictures, thread 1 rotates a groove location, with event notice thread 2; Rotate again a groove location, with event notice thread 3; Continuous circulation realizes thread 2,3 and responds in turn; Thread 2 and thread 3 are controlled respectively video camera 1, the capture of video camera 2, analysis, judgement, record;
Array of software creation, each filter stick is delivered to some drums, in array, since 0, is that it is numbered, and capture and analysis result are all recorded in the array of corresponding numbering; Groove location of the every rotation of a drum of taking pictures, array is shifted one; The each back to zero of photoelectric code disk, a drum of taking pictures rotates a circle, and corresponding array sequence number gets back to 0, and the sequence number that realizes filter stick with this is followed the tracks of;
Thread 1 often detects the drum of taking pictures and rotates a groove location, and in array, whether qualified in inquiry if now rejecting position filter stick, controls to reject valve and realize bad part eject.
7. the device of cigarette filter rod end surface shape according to claim 3 quality testing, is characterized in that,
Paging wheel (1) docks with filter stick end production equipment (43), and a drum of taking pictures is installed successively, rejects a position drum, rewinding drum, on a drum of taking pictures, the end of transmission main shaft (18) is provided with centring ring (12), cabinet shell (16) is installed on centring ring (12), in cabinet shell (16), there are successively gear case (13) and back-up ring (14), by angular contact bearing (17), the transmission cover (15) that slows down is installed, at the other end of transmission main shaft (18), by rotation back-up ring (19), transfer wheel (20) is installed; Centre is to reject position drum; Being close to is rewinding drum, rewinding drum is rack-mount by zanjon bearing (21), rewinding drum center is main shaft, on main shaft is longitudinal, locating ring (22), main shaft bearing (23), main shaft orientation ring (25), main shaft back-up ring (27), bearing inner sleeve (28) and front-end of spindle bearing (29) are installed successively, main shaft diameter is upwards overlapped and is had main shaft distance bushing (26) and main shaft fixed cover (24) successively;
Transmission main shaft (18) is fixing, power section is inner at transmission reducer casing (15) after being come by equipment dynamic gear transmission, the drum (6) of taking pictures is given in transmission respectively, reject position drum (7), rewinding drum (8), in above-mentioned three drums, drum high-speed rotation, air enters by the aperture of surface of tub wheel, produce negative pressure, the transmission shaft of drum the inside has space, the relative transmission shaft of rotation of drum has produced different negative pressure, filter tip is by the negative pressure adhesive of drum, three drums are when rotating, produce each other Negative Pressure Difference, filter stick is delivered to another one drum from a drum under the effect of drum Negative Pressure Difference, paging wheel and filter stick production equipment end on, the filter stick that production equipment is produced enters the groove on paging wheel successively, with air pressure, filter stick is blown to drum front end, locating ring by paging wheel front end makes filter stick end face position neat, negative pressure device on drum wheel groove holds filter stick, and be delivered to a drum of taking pictures, reject position drum and rewinding drum.
8. the device of cigarette filter rod end surface shape according to claim 3 quality testing, it is characterized in that, vision module group unit comprises camera adjustments seat (35), two identical cameras (34) are installed on camera adjustments seat (35), the front end of camera is fixed with camera lens (33), there is photoelectric code disk (32) front portion of camera lens (33), photoelectric code disk (32) is connected with the drum (6) of taking pictures by shaft coupling (31), annular light source is near the end face of a drum (6) of taking pictures, camera adjustments seat (35) regulates camera to make camera lens (33) center aim at annular light source interstitial hole center, transmitted signal often turns an angle in rotation process, the drum (6) of taking pictures is connected with paging wheel (1) on one side, another side is connected with a rejecting position drum (7).
9. the device of cigarette filter rod end surface shape according to claim 3 quality testing, it is characterized in that, in the middle of rejecting position drum (7), be fixed with a rejecting position stationary shaft (40), rejecting position stationary shaft (40) is a tubular shaft, reject on position stationary shaft (40) and have inner sleeve (38), rejecting a position stationary shaft (40) is fixed on after transmission case body on plate (36), rejecting position stationary shaft (40) middle part is provided with and is rejected position drum (7) by rejecting position bearing (37) and drum bearing (39), the end of rejecting position stationary shaft (40) is provided with bearing cover (42), reject in position drum (7) and have rejecting air channel (41), power passes to and rejects position drum (7) from mainshaft gear, negative pressure air enters from rejecting the aperture on position drum (7) surface, through inner sleeve, take away, thereby produced the negative pressure of rejecting position drum (7) surface, when substandard products filter tip forwards to, rejected position, industrial computer sends signal, open high-frequency electromagnetic valve, pressure-air enters drum (7) inside, rejecting position through rejecting air channel, and moment, pressure-air blew away substandard products filter tip the negative pressure destruction of rejecting the rejecting position of position drum (7).
10. the method for cigarette filter rod end surface shape according to claim 1 quality testing, is characterized in that, filter stick end surface shape quality detecting system software is mainly comprised of 4 threads, and its thread 1 is for checking photoelectric code disk back to zero signal sum counter signal; Thread 2 is for video camera 1 capture and analysis; Thread 3 is for video camera 2 captures and analysis; Thread 4 is for interface display and result output;
The specific works mode of 4 threads is as follows:
After system starts, thread 2,3 is in waiting for the state of the event of taking pictures, and thread 1 starts to check the turn signal of photoelectric code disk, reads code-disc pulse;
Thread 1 detects drum and rotates a groove location, triggers the event of taking pictures of thread 2, then rotates a groove location, triggers the event of taking pictures of thread 3;
Thread 2,3 is being received overly according to after event, controls camera acquisition, obtains collection image, carries out analysis of image data record analysis result to data buffer, then the circular wait event of next time taking pictures;
Thread 1 checks data buffer, searches current rejecting position filter stick parameter, judges whether to reject, and carries out corresponding mechanism controls;
1 pair of data buffer records data displacement of thread, simultaneously with event notice thread 1;
Thread 1 counting statistics data, save data enters database, upgrades interface display;
Flow process 2-6 circulation;
Stop button on artificial click interface, software quits work.
The method of 11. cigarette filter rod end surface shape according to claim 1 quality testings, is characterized in that, filter stick end surface shape quality detecting system software mainly comprises: camera calibration module, for camera calibration; Image capture module, controls for camera review collection; Image analysis module, for analysis of image data; Electromechanical Control module, controls for electromechanical structure; Parameter setting module, carries out setting parameter and the management such as examination criteria for user; System debug module, for user's debugging, examination device fault; Interface display module, display video image and necessary examination criteria, measurement result statistical information etc. on interface.
The method of 12. cigarette filter rod end surface shape according to claim 1 quality testings, it is characterized in that, Camera Calibration Algorithm flow process: camera marking method is used length and width to be the gridiron pattern scaling board of 8 millimeters, total 11X11 chequered with black and white chequer in scaling board, after camera is taken pictures to scaling board, software extracts X-comers, by volume coordinate and the image coordinate of angle point, resolves the Transformation Relation of Projection P;
Resolve flow process as follows:
One, by projection equation's formula, take each angle point volume coordinate and image coordinate is known number, and the P of take sets up system of linear equations, linear solution P as unknown number;
Two, from P, decompose the inside and outside parameter of video camera that comprises error;
Three, set up the inside and outside parametrical nonlinearity system of equations of video camera, utilize least square Iterative Nonlinear System of Equations;
Four, set up video camera aberration system equation group, solve aberration system;
Five, 3-4 convergence, algorithm finishes, otherwise circulation 3-4.
The method of 13. cigarette filter rod end surface shape according to claim 1 quality testings, it is characterized in that, filter stick end surface shape parameter measurement algorithm flow: camera acquisition obtains after an image, through image smoothing filtering technique, image binaryzation, whole pixel profile extract, sub-pix profile is accurately located, noise profile is rejected, image coordinate is to steps such as physical coordinates conversion, profile analysis, calculation of parameter, completes filter stick end face excircle configuration and filter stick cavity pattern analysis.
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| CN111982008A (en) * | 2020-08-28 | 2020-11-24 | 四川三联新材料有限公司 | Cigarette filter stick cutting depth detection device |
| CN112772968A (en) * | 2021-01-26 | 2021-05-11 | 红云红河烟草(集团)有限责任公司 | Cigarette filter tip end face visual detection system of cigarette making machine |
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