CN114087981B - Online detection method for laser holes of cigarette filter tip based on laser polishing method - Google Patents
Online detection method for laser holes of cigarette filter tip based on laser polishing method Download PDFInfo
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- CN114087981B CN114087981B CN202111239805.8A CN202111239805A CN114087981B CN 114087981 B CN114087981 B CN 114087981B CN 202111239805 A CN202111239805 A CN 202111239805A CN 114087981 B CN114087981 B CN 114087981B
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- 235000019504 cigarettes Nutrition 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000001514 detection method Methods 0.000 title claims abstract description 30
- 238000005498 polishing Methods 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims description 17
- 238000003708 edge detection Methods 0.000 claims description 4
- 230000000877 morphologic effect Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 description 5
- 239000011295 pitch Substances 0.000 description 4
- 241000208125 Nicotiana Species 0.000 description 3
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- WDJHALXBUFZDSR-UHFFFAOYSA-N acetoacetic acid Chemical compound CC(=O)CC(O)=O WDJHALXBUFZDSR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229920006239 diacetate fiber Polymers 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/002—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/28—Measuring arrangements characterised by the use of optical techniques for measuring areas
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a laser hole on-line detection method of a cigarette filter tip based on a laser polishing method, which comprises the steps of driving laser into the interior of the cigarette filter tip perpendicularly to the end face of the cigarette filter tip; a high-speed camera is adopted to shoot laser hole images of the cigarette filter in parallel with the axial direction of the cigarette filter; extracting a laser hole effective area in the laser hole image; acquiring all laser hole position coordinates according to the laser hole effective area; and judging the deviation degree of the transverse laser holes and the longitudinal laser holes according to the obtained coordinates of all the laser holes, and judging whether the laser holes are missing or not. According to the invention, by means of polishing the end face of the cigarette filter tip vertically, a laser hole image with high brightness can be clearly obtained under the high-speed production condition, multiple indexes can be detected simultaneously, and the accuracy of detection results is higher.
Description
Technical Field
The invention relates to the field of cigarette quality detection, in particular to a laser hole online detection method of a cigarette filter tip based on a laser polishing method.
Background
Along with the development of the variety of cigarettes, the variety of cigarettes is subdivided in the classification of coarse cigarettes, medium cigarettes and fine cigarettes, besides the quality of cigarettes is determined by tobacco leaves, the continuous innovation of the cigarette filter tip in recent years also pushes the innovation of the tobacco industry to a new height. For the taste of the cigarettes, the determining factors are closely related to the factors such as the compaction degree of the cigarettes, the thickness of the cigarettes, the structure of the filter tip and the like besides the quality of the tobacco leaves; in the production of fine cigarettes and medium cigarettes, the difficulty of the coarse cigarettes is higher in the control of production index parameters such as suction resistance due to the smaller diameter, so that the taste of the cigarettes is improved in order to meet the production index, the requirement of the production index is met by adopting a mode of carrying out laser perforation on tipping paper, and the taste of the cigarettes is improved.
No matter the tipping paper used in the production process is perforated online or is perforated offline, laser holes are relatively small, holes are difficult to distinguish by naked eyes, the current common detection mode is through offline detection, a magnifying glass or a microscope is required to be adopted for detection under many conditions, the detection efficiency is low, and the detection of all cigarettes cannot be completed. In this regard, online detection schemes have been proposed by those skilled in the art.
CN210038861U discloses an on-line detecting device for laser drilling of cigarette filter tip, the polishing method of the device adopts polishing from the right under the cigarette filter tip, and adopts a camera to obtain image directly over the filter tip, and obtains laser hole image for on-line detection. The device has the following problems in practical application: 1. under the wrapping of tipping paper, the conventional cigarette filter tip has no light transmittance and cannot well present laser hole points; 2. under the condition that tipping paper is light-free, light is transmitted only through the laser hole at the lower part, and in the high-speed production process, the light entering the filter tip is very little and cannot be detected normally; 3. because the light emitted by the light source has overflow and diffraction effects, when the camera acquires an image, the light overflowed and diffracted by the light source is 100 times more than the light intensity of the laser hole part of the filter tip to be detected, so that a high-quality image for detection cannot be acquired, and the detection accuracy is very influenced.
Disclosure of Invention
The invention aims at: aiming at the problems, the online detection method for the laser holes of the cigarette filter tip based on the laser polishing method is provided, so that the quality index of the laser holes of the cigarette filter tip part can be still detected online under high-speed production.
The technical scheme adopted by the invention is as follows:
A cigarette filter tip laser hole on-line detection method based on a laser polishing method comprises the following steps:
Driving laser into the cigarette filter tip perpendicularly to the end face of the cigarette filter tip;
A high-speed camera is adopted to shoot laser hole images of the cigarette filter in parallel with the axial direction of the cigarette filter;
extracting a laser hole effective area in the laser hole image;
acquiring all laser hole position coordinates according to the laser hole effective area;
and judging the deviation degree of the transverse laser holes and the longitudinal laser holes according to the obtained coordinates of all the laser holes, and judging whether the laser holes are missing or not.
Further, the method further comprises:
and separating laser holes in the middle area according to the obtained coordinates of all the laser holes, and calculating the distance between the laser holes in the middle area.
Further, the middle area includes a middle row of laser holes and each row of laser holes above and below the middle row of laser holes, or the middle area includes two middle rows of laser holes.
Further, the calculating the pitch of the laser holes in the middle area includes:
and calculating the distance between adjacent laser holes in the middle area, comparing the calculated distance with the appointed laser hole distance to obtain a first proportion, and calculating the actual distance between the laser holes in the middle area according to the first proportion.
Further, the extracting the laser hole effective area in the laser hole image includes:
performing first gray scale processing, first binarization processing and first denoising processing on the laser hole image;
Performing edge detection;
And obtaining the external rectangle of the outer edge.
And intercepting the laser hole effective area from the original laser hole image according to the circumscribed rectangular area.
Further, the first denoising process adopts a morphological processing method.
Further, the obtaining all laser hole position coordinates according to the laser hole effective area includes:
performing second gray level processing, second binarization processing and second denoising processing on the laser hole effective area;
searching the outline to obtain all laser hole area outlines;
And acquiring the position coordinates of each laser hole according to the outline of the laser hole area.
Further, the determining the deviation degree of the transverse laser hole and the longitudinal laser hole according to the obtained coordinates of all laser holes comprises:
Separating out laser holes in each row and each column by adopting a nearest neighbor classification method according to an X coordinate and a Y coordinate respectively;
judging the vertical deviation degree of the Y coordinate by taking the Y coordinate as a reference according to each separated row of laser holes; and judging the left-right deviation degree of the X coordinate by taking the X coordinate as a reference according to each separated row of laser holes.
Further, the determining whether there is a laser hole missing according to the obtained coordinates of all laser holes includes:
and judging whether the defect exists according to the obtained hole position coordinates of all the laser holes, and if so, judging that the laser Kong Queshi exists.
Further, the method further comprises:
The size of each laser hole is calculated from the area of each laser hole area profile.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. According to the invention, the laser hole image with high brightness can be clearly obtained under the high-speed production condition by the mode of polishing the end face of the cigarette filter tip vertically, so that the accuracy of the detection result obtained by detection is higher. Experiments prove that the invention can still easily obtain high-quality laser hole images at the production speed of 9000-12000 counts/min.
2. The invention can detect a plurality of laser hole quality indexes simultaneously and carry out combination judgment, so that the final detection result can meet the standard requirement or the industry requirement.
3. The method for detecting and judging the laser hole index is simple in design, small in calculated amount and rapid in detection, and detection operation is carried out on the laser hole effective area.
Drawings
The invention will now be described by way of example and with reference to the accompanying drawings in which:
Fig. 1 is a flow chart of the operation of the method for on-line detection of laser holes of a cigarette filter based on the laser polishing method.
Fig. 2 schematically illustrates the propagation path of the laser light in the cigarette filter.
Fig. 3 is a diagram of the operation process of the laser hole image at each step in the operation process of the detection method.
Fig. 4 is a side view of the detection device in combination with a drum device.
Fig. 5 is a perspective view corresponding to the structure of fig. 4.
Fig. 6 is a schematic structural view of the detecting device.
Fig. 7 is a schematic view of the cigarette structure.
In the figure, 3a is a laser hole image after gray scale processing, 3B is a laser hole image after binarization processing, 3c is a laser Kong Zhixin schematic diagram, 1 is a camera, 2 is a laser light source, 3 is a cigarette, 4 is a mounting rack, 5 is a drum device, 31 is a cigarette filter, 31A is a front end face of the cigarette filter, 41 is a mounting plate, 42 is a mounting base, 43 is a connecting rod, 44 is a camera support, 45 is a light source support, 45A is a first support arm, 45B is a second support arm, 46 is an angle adjusting support, 51 is a first drum, 52 is a first rotating shaft, 53 is a second drum, and 54 is a second rotating shaft.
Detailed Description
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Example 1
As shown in fig. 1, this embodiment discloses a method for detecting a laser hole of a cigarette filter on line based on a laser polishing method, including:
1) And (3) driving laser into the cigarette filter tip perpendicularly to the end face of the cigarette filter tip.
This feature is very important, as shown in fig. 2, in this embodiment, a laser light source with an optical power of 200mw is used, and laser light is driven into the interior of the cigarette filter tip perpendicularly to the end face of the cigarette filter tip, and light propagation is performed through a light-tight medium formed by a white diacetate fiber bundle (chemical formula C 20H44 BrN); due to the irregularities of the filament bundle, the physical properties are stable and the light absorptivity is weak, the light can be subjected to specular reflection at each filament bundle point in the propagation process, a part of the light propagates forwards through multiple reflections, and a part of the light is scattered outwards in the reflection process, so that the forward propagation and scattering effects are generated. The inner wall of the tipping paper is smooth and white, and has a reflection effect on light, so that the outwards scattered light is restrained, the light is forced to forward spread, and a large amount of scattered light is outwards spread at the position of the laser hole, so that a clear and high-brightness laser hole is formed.
2) And (3) adopting a high-speed camera to shoot laser hole images of the cigarette filter in parallel to the axial direction of the cigarette filter.
Laser hole images were acquired with an 800fps high speed camera at an exposure time of 0.08 ms. Based on the production speed of 120 cigarettes/second, the used area array camera needs to be 4 times higher than the production speed of the cigarettes to obtain the images of the cigarette filters, and a high-speed area array industrial camera with proper multiplying power is selected according to the diameter and the groove number of the drum of the cigarette machine. The higher-speed camera can bring higher-precision control time, so that smear generated in the high-speed photographing process is smaller, and judgment errors of the size of the laser hole are reduced.
3) And extracting the laser hole effective area in the laser hole image.
After the high-quality laser hole image is acquired, the parts except the laser holes in the acquired laser hole image are black in view of a unique polishing method. The process of extracting the laser hole effective area comprises the following steps:
(1) The laser hole image is grayed, which is a gray processing step. As shown at 3a in fig. 3.
(2) Threshold binarization generates a black-and-white image, which is a binarization processing step. As shown at 3b in fig. 3.
(3) And (3) performing corrosion on the redundant white area by adopting an operation core with a core size 3*3.
(4) The expansion using an operation core of core size 7*7 knows that all white areas are connected together.
The steps (3) and (4) are morphological processing steps, and other denoising methods can be selected for denoising.
(5) The outside edge of the region is obtained by a canny edge detection operator, which is an edge detection step.
(6) And obtaining the external rectangle of the outer edge.
(7) And intercepting the laser hole effective area from the original laser hole image according to the circumscribed rectangular area.
The effective area is cut off, so that on one hand, the subsequent calculation amount can be reduced, and on the other hand, the influence of unnecessary noise on the subsequent calculation can be effectively avoided.
4) And acquiring the position coordinates of all laser holes according to the laser hole effective area. The process comprises the following steps:
(1) The laser aperture active area is grayed out as shown in fig. 3, 3 a.
(2) Threshold binarization generates a black-and-white image, see 3b in fig. 3.
(3) And (3) performing corrosion on the redundant white area by adopting an operation core with a core size 3*3. Or other denoising methods are selected for denoising.
(4) Searching the outline to obtain all laser hole area outlines.
(5) And acquiring the position coordinates of each laser hole according to the outline of the laser hole area. The location coordinates of each laser hole are obtained, for example, by calculating the centroid of the profile of each laser hole area. As shown at 3c in fig. 3.
(6) Alternatively, the area of each laser aperture profile may also be calculated separately.
5) Judging the deviation degree of the transverse laser holes and the longitudinal laser holes according to the obtained coordinates of all the laser holes; and also to determine if laser Kong Queshi is present. The process comprises the following steps:
(1) Judging whether missing coordinates exist according to all the obtained laser hole position coordinates, for example, N laser hole position coordinates are needed, and if N-1 laser hole position coordinates are actually detected, indicating that the missing coordinates exist. If there is a missing coordinate, it is determined that there is laser Kong Queshi.
(2) And separating the laser holes in each row and each column by adopting a nearest neighbor classification method (KNN) according to the X coordinate and the Y coordinate.
(3) And judging the vertical deviation degree of the Y coordinate by taking the Y coordinate as a reference according to each separated row of laser holes. And judging the left-right deviation degree of the X coordinate by taking the X coordinate as a reference according to each separated row of laser holes. And judging whether each row of laser holes are on a straight line or not according to the left-right deviation degree of the X coordinate and the up-down deviation degree of the Y coordinate, and whether each column of laser holes are on a straight line or not. If the laser holes are not aligned in any direction of the rows and columns or if the laser Kong Queshi is present, the laser holes are judged to be unqualified and removed.
Further, the method further comprises the following steps:
6) And separating laser holes in the middle area according to the obtained coordinates of all laser holes, and calculating the distance between the laser holes in the middle area (adjacent). The above determination of whether the laser beam Kong Queshi is present may be performed by the pitch of the adjacent laser holes, or if there is a different pitch in the same row or the same column or if there is a multiple relationship in the different pitches, it is determined that the laser beam Kong Queshi is present.
Because the cigarette filter is columnar, the image collected by the camera from the side surface can compress the distance between laser holes at the edge on the image, but the alignment of the rows and columns of the laser holes is not affected. In this step, a certain number or a certain size of laser holes located in the middle region among all laser holes are separated. The middle region may be defined as, for example, a middle row and upper and lower rows, and for the case where there are no laser holes in the middle position, the middle region is defined as including the middle two rows of laser holes.
The distance between the laser holes in the middle area (adjacent) is calculated, the calculated distance is compared with the agreed distance between the laser holes, a first proportion is obtained, and the actual distance between the laser holes in the middle area is calculated according to the first proportion. The agreed laser hole spacing can be a set value or an average value obtained by actually measuring the laser hole spacing of a large number of qualified cigarette filters.
7) The size of each laser hole is calculated from the area of each laser hole area profile.
In the step 4), the area of each laser hole area profile can be calculated. The area of the laser hole effective area is compared with the area of the appointed laser hole effective area to obtain a second proportion, and the area of each laser hole outline in the image is scaled through the second proportion, so that the actual area of each laser hole can be obtained. Further, the actual area of each laser hole may be checked. For example, determining whether the maximum laser hole exceeds the allowable maximum area, or determining uniformity of laser hole areas in units of rows, may be achieved by calculating standard deviations of laser hole areas of each row.
Example two
As shown in fig. 4, the present embodiment discloses a device for acquiring an image of a laser hole of the embodiment, which comprises a camera 1, a laser light source 2 and a mounting frame 4, and cigarettes 3 are transported on a drum device 5. The mounting frame 4 is used for mounting the camera 1 and the laser light source 2 into a whole, i.e. both the camera 1 and the laser light source 2 are mounted on said mounting frame 4. Typically, the mounting frame 4 is mounted above the drum means 5. Referring to fig. 7, the laser light source 2 is opposite to the front end face 31A of the cigarette filter 31, the camera 1 is located in the circumferential direction of the cigarette filter 31, and the field of view of the camera 1 is opposite to the cigarette filter 31 to acquire a laser hole image. The laser source 2 shines to the cigarette 3, in throwing into the filter rod with laser, carries out light propagation through the light dense medium that the diacetic acid fibre silk bundle formed, because the irregularity of silk bundle, light can scatter in the transmission process, and in this process, because the constraint of tipping paper, light will spread forward in the diffusion, carries out a large amount of scattering outwards propagation in the position of laser hole. The camera 1 is opposite to the cigarette filter tip 31, namely opposite to the laser hole of the cigarette filter tip, at this time, a high-brightness laser hole image is collected, and various indexes (such as the position, the size, the absence and the like of the laser hole) of the laser hole are detected by a subsequent image detection system. The design utilizes the laser light source 2 to polish from the end face of the cigarette filter tip 31, can form an ultra-clear highlight bright spot through the principle of laser scattering, and can easily obtain high-quality laser hole images for use under the production speed of 9000-12000 counts/min by being matched with an 800fps high-speed area array industrial camera.
As shown in fig. 5, the drum means 5 comprise a first drum 51 and a second drum 53, and of course, typically a cigarette-out drum and a reject drum, which are not described in detail in this specification, since they are not involved in the present application. The first drum 51 rotates about a first axis of rotation 52 and the second drum 53 rotates about a second axis of rotation 54, the first drum 51 and the second drum 53 being rotationally coupled in opposite directions, typically by the drum means 5, by creating a negative pressure on the surface to attract the cigarettes 3. The drum means 5 is connected to an encoder (not shown) which follows the rotation of the drum means 5 and outputs an encoder signal which is transmitted to the camera 1, the camera 1 selecting a suitable position based on the encoder signal to complete the acquisition of the laser hole image of the active area.
It should be noted that, the drums of the drum device 5 are closely matched, and the interval between the drums is limited, so that in this embodiment, the camera 1 uses a ninety degree angle camera, which can be installed in a narrow space.
Example III
The present embodiment discloses a specific structure of the mount 4 in the second embodiment.
The mount 4 is an assembly for mounting the camera 1 and the laser light source 2, and is required to facilitate the mounting and dismounting of the camera 1 and the laser light source 2. In some embodiments, as shown in fig. 6, the mounting frame 4 comprises a mounting plate 41, which mounting plate 41 is mounted to the cigarette production device to secure the detection device. The mounting board 41 is provided with a mounting base 42, and the mounting base 42 is configured to fix the camera 1 and the laser light source 2. The mounting base 42 is designed to be protruded on the mounting plate 41 and is vertically connected to the surface of the mounting plate 41 by a screw. A link 43 is connected to the mounting base 42, the link 43 having a columnar shape, the camera 1 and the laser light source 2 are both connected to the link 43, the camera 1 is connected to a middle position of the link 43, and the laser light source 2 is connected to an end portion of the link 43.
Generally speaking, the positional relationship among the mounting plate 41, the mounting base 42 and the connecting rod 43 is designed to meet the basic requirements of the spatial layout of the camera 1 and the laser light source 2, that is, the position and orientation of the mounting plate 41, the position of the mounting base 42 on the mounting plate 41, the length and the bending and straightening condition of the connecting rod 43, and the like are not particularly required, and the design requirements are designed to be that the field of view of the camera 1 is opposite to the cigarette filter 31 and the laser light source 2 is opposite to the front end face of the cigarette filter 31. However, since the design of the detecting device needs to take into consideration the original structure of the cigarette production device, that is, the design scheme of the detecting device is limited, the detecting device cannot be unfolded too widely in space, in this way, the mounting plate 41 is designed to be parallel to the cigarettes 3, the connecting rod 43 is also designed to be parallel to the cigarettes 3, the mounting base 42 is arranged on the surface of the mounting plate 41, which is close to the drum device, and the connecting rod 43 is connected to the mounting base 42 by means of welding, screwing, via connection, clamping and the like. The link 43 is designed in a short stick shape, a camera support 44 is provided in the middle of the link 43, and a light source bracket 45 is connected to an end of the link 43 away from the mounting base 42. The connecting rod 43 passes through the camera support 44, the camera support 44 holds the connecting rod 43 tightly, the light source bracket 45 is connected to the connecting rod 43, the camera support 44 is used for installing the camera 1, and the light source bracket 45 is used for installing the laser light source 2.
In view of the shooting angle of the camera 1 and the lighting angle of the laser light source 2, which need to be adjusted as needed, an angle adjustment bracket 46 is provided on the camera mount 44, and the camera 1 is mounted on the angle adjustment bracket 46. One end of the light source bracket 45 is hinged to the end of the connecting rod 43, and the other end is connected with the laser light source 2. In some embodiments, the light source support 45 is of a foldable structure, so that it has two degrees of freedom of rotation around the link 43 and folding on itself, and the position of the laser light source 2 can be flexibly adjusted.
In some embodiments, the light source support 45 includes more than two arms, two adjacent arms are hinged, one end of each free end is hinged with the connecting rod 43, and the other end is connected with the laser light source 2. The light source bracket 45 is exemplified here by two arms, and a greater number of arms are similarly configured. As shown in fig. 6, the light source bracket 45 is composed of a first support arm 45A and a second support arm 45B, one end of the first support arm 45A is hinged to one end of the second support arm 45B, the other end of the first support arm 45A is hinged to the end of the connecting rod 43, and the other end of the second support arm 45B is connected to the laser light source 2.
Example IV
The present embodiment discloses another structure of the mount 4, the mount 4 is substantially the same as the mount 4 of the third embodiment, except that the mount base 42 is connected to the middle of the link 43, and the camera mount 44 and the light source bracket 45 are connected to both end portions of the link 43, respectively.
Example five
The present embodiment discloses another structure of the mounting bracket 4, which mounting bracket 4 is substantially identical to the mounting bracket 4 of the third embodiment, except that in the present embodiment, the mounting plate 41, the mounting base 42 and the link 43 are replaced with a bent connecting rod. The end of the connecting rod is directly fixed to the cigarette production device.
Example six
The present embodiment discloses another structure of the mount 4, the mount 4 being substantially identical to the mount 4 of the third embodiment, the only difference being that in the present embodiment, the mount 4 eliminates the mounting base 42 and the link 43, and the camera mount 44 and the light source bracket 45 are directly attached to the mounting plate 41.
The invention is not limited to the specific embodiments described above. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.
Claims (4)
1. The online detection method for the laser holes of the cigarette filter tip based on the laser polishing method is characterized by comprising the following steps of:
Driving laser into the cigarette filter tip perpendicularly to the end face of the cigarette filter tip;
A high-speed camera is adopted to shoot laser hole images of the cigarette filter in parallel with the axial direction of the cigarette filter;
extracting a laser hole effective area in the laser hole image;
acquiring all laser hole position coordinates according to the laser hole effective area;
judging the deviation degree of the transverse laser holes and the longitudinal laser holes according to the obtained coordinates of all the laser holes, and judging whether laser Kong Queshi exists or not; or alternatively
Separating laser holes of the middle area according to the obtained coordinates of all laser holes, calculating the distance between the laser holes of the middle area, and judging that laser Kong Queshi exists if different distances exist in the same row or the same column or multiple relations exist in different distances;
The device for collecting the laser hole images comprises a camera (1), a laser light source (2) and a mounting frame (4), wherein a cigarette (3) is transported on a drum device (5), the camera (1) and the laser light source (2) are both arranged on the mounting frame (4), the mounting frame (4) is arranged above the drum device (5), the laser light source (2) is opposite to the front end face (31A) of a cigarette filter tip (31), the camera (1) is positioned in the circumferential direction of the cigarette filter tip (31), and the field of view of the camera (1) is opposite to the cigarette filter tip (31);
The mounting frame (4) comprises a mounting plate (41), the mounting plate (41) is mounted on a cigarette production device to fixedly collect the laser hole images, a mounting base (42) is arranged on the mounting plate (41), the mounting base (42) is arranged on the mounting plate (41) in a protruding mode, the mounting base is vertically connected to the surface of the mounting plate (41) through a screw, a connecting rod (43) is connected to the mounting base (42), and the connecting rod (43) is cylindrical; the mounting plate (41) is parallel to the cigarette (3), the connecting rod (43) is also parallel to the cigarette (3), a camera support (44) is arranged in the middle of the connecting rod (43), a light source bracket (45) is connected to the end part of the connecting rod (43) far away from the mounting base (42), the connecting rod (43) passes through the camera support (44), the connecting rod (43) is tightly held by the camera support (44), and the light source bracket (45) is connected to the connecting rod (43); an angle adjusting bracket (46) is arranged on the camera support (44), and the camera (1) is arranged on the angle adjusting bracket (46); the light source bracket (45) is of a foldable structure, one end of the light source bracket (45) is hinged to the end part of the connecting rod (43), and the other end of the light source bracket is connected with the laser light source (2);
the extracting the laser hole effective area in the laser hole image comprises the following steps:
performing first gray scale processing, first binarization processing and first denoising processing on the laser hole image;
Performing edge detection;
obtaining an external rectangle of the outer edge;
Intercepting a laser hole effective area from an original laser hole image according to the circumscribed rectangular area;
and judging the deviation degree of the transverse laser holes and the longitudinal laser holes according to the obtained coordinates of all the laser holes, wherein the method comprises the following steps:
Separating out laser holes in each row and each column by adopting a nearest neighbor classification method according to an X coordinate and a Y coordinate respectively;
judging the vertical deviation degree of the Y coordinate by taking the Y coordinate as a reference according to each separated row of laser holes; judging the left-right deviation degree of the X coordinate by taking the X coordinate as a reference according to each separated row of laser holes;
Judging whether laser holes are missing or not according to all the obtained laser hole position coordinates, including:
judging whether missing coordinates exist according to all the obtained laser hole position coordinates, if yes, judging that laser Kong Queshi exists;
The middle area comprises a middle row of laser holes and each row of laser holes above and below the middle row of laser holes, or the middle area comprises a middle two rows of laser holes;
the calculating the pitch of the laser holes in the middle area comprises the following steps:
and calculating the distance between adjacent laser holes in the middle area, comparing the calculated distance with the appointed laser hole distance to obtain a first proportion, and calculating the actual distance between the laser holes in the middle area according to the first proportion.
2. The method for on-line detection of a laser hole of a cigarette filter tip based on a laser polishing method as claimed in claim 1, wherein the first denoising treatment adopts a morphological treatment method.
3. The method for on-line detecting laser holes of a cigarette filter tip based on the laser polishing method as claimed in claim 1, wherein said obtaining all laser hole position coordinates according to the laser hole effective area comprises:
performing second gray level processing, second binarization processing and second denoising processing on the laser hole effective area;
searching the outline to obtain all laser hole area outlines;
And acquiring the position coordinates of each laser hole according to the outline of the laser hole area.
4. The method for on-line detection of a laser hole of a cigarette filter tip based on a laser polishing method as claimed in claim 1, further comprising:
The size of each laser hole is calculated from the area of each laser hole area profile.
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