CN111750785A - On-line measuring method and measuring device for coating thickness and coating quality - Google Patents
On-line measuring method and measuring device for coating thickness and coating quality Download PDFInfo
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- CN111750785A CN111750785A CN202010630652.9A CN202010630652A CN111750785A CN 111750785 A CN111750785 A CN 111750785A CN 202010630652 A CN202010630652 A CN 202010630652A CN 111750785 A CN111750785 A CN 111750785A
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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
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
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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
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means, e.g. by light scattering, diffraction, holography or imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/9508—Capsules; Tablets
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
- Immunology (AREA)
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- Dispersion Chemistry (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses an on-line measuring method for coating thickness and coating quality, which comprises the following steps: s1: obtaining the particles from the coating cavity through a measuring device, and enabling the particles to be flatly laid on the grabbing plate; s2: starting a camera and a structured light projector to obtain a particle picture containing structured light coding information and not containing structured light coding information of the particles on the grabbing plate, and carrying out image processing analysis on the particle picture by using an image analysis method to obtain the average diameter and the morphology of the particles; s3: obtaining the coating thickness by using the difference of the average diameters of the particles measured twice; s4: if the coating thickness is larger than the specified thickness, judging the coating surface defects by using the image information obtained by the last image analysis so as to evaluate the coating surface quality; s5: if the coating thickness is less than the prescribed thickness, steps S1-S3 are repeated until the coating thickness is greater than the prescribed thickness, and step S4 is performed. The invention also discloses a device for measuring the coating thickness and the coating quality. The method has the advantages of low cost and high precision.
Description
Technical Field
The invention relates to the technical field of coating machines, in particular to an online measuring method and a measuring device for coating thickness and coating quality.
Background
The coating machine is an efficient, energy-saving, safe and clean mechatronic device which can carry out organic film coating, water-soluble film coating and slow and controlled release coating on tablets, pills, candies and the like. The coating machine is suitable for the industries of pharmacy, chemical industry, food and the like.
The existing method for measuring the coating thickness based on the image analysis technology mainly utilizes a high-speed camera to shoot a two-dimensional image of moving particles in a coating machine through an observation hole, then adopts the image analysis technology to obtain the diameter value of the particles, and finally obtains the coating thickness. The main disadvantages of this method are: (1) high-speed cameras are costly; (2) during shooting, particles are in a high-speed motion state, and because the coating machine is generally made of high-reflectivity metal such as stainless steel and the like, background light interference is serious, so that the definition of a shot photo is poor, and during later image processing, boundary acquisition is difficult, measurement accuracy is poor, so that the deviation between the final actual coating thickness and the measured coating thickness is large, and the coating quality is influenced. (3) The method only obtains the particle diameter through a plane two-dimensional image, and is difficult to measure for non-spherical particles.
Disclosure of Invention
To the deficiency of the prior art, the technical problem to be solved by the present patent application is: how to provide an on-line measuring method and a measuring device for coating thickness and coating quality, which can better reduce cost, improve image precision and improve particle diameter measuring precision so as to improve coating thickness and coating defect detection precision. The measurement method can solve the problems of non-spherical particle size measurement and coating thickness measurement at the same time.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for on-line measurement of coating thickness and coating quality, comprising the steps of:
s1: obtaining the particles from the coating cavity through a measuring device, and enabling the particles to be flatly laid on the grabbing plate;
s2: starting a camera and a structured light projector to obtain a particle picture containing structured light coded information and not containing the structured light coded information of the particles on the grabbing plate, and carrying out image processing analysis on the particle picture by using an image analysis method for assisting structured light three-dimensional measurement to obtain image information, wherein the image information comprises the average diameter and the morphology of the particles;
s3: obtaining the coating thickness by using the difference of the average diameters of the particles measured twice;
s4: if the coating thickness is larger than the specified thickness, judging the coating surface defects by using the image information obtained by the last image analysis so as to evaluate the coating surface quality;
s5: if the coating thickness is less than the prescribed thickness, steps S1-S3 are repeated until the coating thickness is greater than the prescribed thickness, and step S4 is performed.
In step S2, the particle picture of the structured light encoded information obtains the particle height size information through differential binarization, coded binary conversion, spatial coded image generation, triangular transformation and three-dimensional coordinate information, the particle picture without the structured light encoded information obtains the two-dimensional transverse size of the particle through binarization and edge detection, and the particle diameter size is obtained by integrating and comparing the particle height size information and the two-dimensional transverse size information.
The invention also discloses a device for measuring the thickness and quality of the coating, which comprises a support box arranged on the side wall of the coating machine, wherein a power device is fixedly arranged on one side of the support box, a material taking port is formed in the side wall of the coating machine, a hole is formed in the support box, which is opposite to the material taking port, a grabbing plate is in sliding fit with the material taking port, the power device is used for driving the grabbing plate to slide along the material taking port, an upper panel is arranged at the upper end of the support box, an image acquisition window is arranged on the upper panel, a camera support is arranged at the upper end of the support box, a camera and a structured light projector are arranged on the camera support, and a particle tiling mechanism is arranged on one side, which is close to the coating machine, of the support box.
The power device comprises a transverse cylinder body fixedly mounted on a support box through a front panel, the support box is right opposite to a piston rod of the transverse cylinder, and the piston rod of the transverse cylinder penetrates through the through hole and is fixedly connected with one end of the grabbing plate.
Wherein, granule tiling mechanism is including setting up the granule tiling baffle in the supporting box, granule tiling baffle is located the top of grabbing the board, granule tiling baffle is L shape, the laminating of granule tiling baffle one side and capsule machine's lateral wall, be provided with the actuating mechanism who is used for driving granule tiling baffle along the motion of vertical direction on the supporting box.
The supporting box is vertically provided with a guide hole in a penetrating mode, and the particle tiling baffle is fixedly provided with a guide rod in the guide hole in a sliding fit mode.
Wherein, actuating mechanism includes fixed mounting at the step motor of support box upper end, step motor's output shaft passes downwards support box fixedly connected with screw rod, the part that the screw rod is located support box connects the cooperation soon to have the nut, granule tiling baffle upper end runs through and is provided with the unthreaded hole, nut fixed mounting be in the unthreaded hole. Step motor rotates, drives the screw rod and rotates, and the screw rod drives nut vertical movement, and then drives granule tiling baffle vertical movement.
In conclusion, the invention has the following beneficial effects:
1. the method changes the original dynamic image acquisition into static image acquisition, and changes the original two-dimensional plane image acquisition into three-dimensional image and two-dimensional image cooperative analysis; the measuring method uses a structured light three-dimensional measuring technology to obtain a depth information assisted planar image processing technology, timely obtains the particle shape and the particle size in a coating machine, further obtains a coating thickness value through a statistical analysis method, and finally obtains the coating surface quality through a static image defect analysis technology.
2. Improve the image precision and the coating thickness measurement precision, and reduce the camera cost.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a flow chart of an on-line measurement method of coating thickness and coating quality.
Fig. 2 is a schematic view of a structure of a coating thickness and coating quality measuring apparatus.
Fig. 3 is a schematic view showing the connection of the coating thickness and coating quality measuring device of fig. 2 to a coating machine, wherein 12 is a coating chamber of the coating machine, 13 is a guide cylinder of the coating machine, and 14 is an air distribution plate of the coating machine, which are all of conventional structures.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. In the present embodiment, the terms "upper", "lower", "left", "right", "front", "rear", "upper end", "lower end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, or be operated, and thus, should not be construed as limiting the present invention.
Referring to fig. 1, an on-line measuring method for coating thickness and coating quality includes the following steps:
s1: obtaining the particles from the coating cavity through a measuring device, and enabling the particles to be flatly laid on the grabbing plate;
s2: starting a camera and a structured light projector to obtain a particle picture containing structured light coded information and not containing the structured light coded information of the particles on the grabbing plate, and carrying out image processing analysis on the particle picture by using an image analysis method for assisting structured light three-dimensional measurement to obtain image information, wherein the image information comprises the average diameter and the morphology of the particles;
s3: obtaining the coating thickness by using the difference of the average diameters of the particles measured twice;
s4: if the coating thickness is larger than the specified thickness, judging the coating surface defects by using the image information obtained by the last image analysis so as to evaluate the coating surface quality;
s5: if the coating thickness is less than the prescribed thickness, steps S1-S3 are repeated until the coating thickness is greater than the prescribed thickness, and step S4 is performed.
In step S2, the particle picture containing the structured light encoded information obtains the particle height size information through differential binarization, coded binary conversion, spatial coded image generation, triangular transformation and three-dimensional coordinate information, the particle picture without the structured light encoded information obtains the two-dimensional transverse size of the particle through binarization and edge detection, and the particle diameter size is obtained by integrating and comparing the particle height size information and the two-dimensional transverse size information.
The method changes the original dynamic image acquisition into static image acquisition, and changes the original two-dimensional plane image acquisition into three-dimensional image and two-dimensional image cooperative analysis; the measuring method uses a structured light three-dimensional measuring technology to obtain a depth information assisted planar image processing technology, timely obtains the particle shape and the particle size in a coating machine, further obtains a coating thickness value through a statistical analysis method, and finally obtains the coating surface quality through a static image defect analysis technology. Improve the image precision and reduce the camera cost.
Referring to fig. 2-3, the invention further discloses a coating thickness and coating quality measuring device 12, which comprises a support box 6 arranged on the side wall of the coating machine, wherein a power device 7 is fixedly arranged on one side of the support box 6, a material taking port is arranged on the side wall of the coating machine 10 and faces the support box 6, an opening is arranged on the support box 6 and faces the material taking port, a grabbing plate 7 is in sliding fit with the material taking port, the power device is used for driving the grabbing plate 7 to slide along the material taking port, an upper panel 3 is arranged at the upper end of the support box 6, an image acquisition window 8 is arranged on the upper panel 3, a camera support 4 is arranged at the upper end of the support box 3, a camera and a structured light projector 5 are arranged on the camera support 4, and a particle tiling mechanism is arranged on one side of the support box 3, which is close to the coating machine 10.
In this way, the power device drives the grabbing plate to penetrate through the material taking port to enter a coating cavity of the coating machine, medicine particles fall on the grabbing plate, then the power device drives the grabbing plate to be pulled back into the supporting box, in the pulling-back process, the particle tiling mechanism blocks the medicine particles, the distance between the particle tiling mechanism and the upper surface of the grabbing plate is 1-2 times of the particle thickness, so that the medicine particles are tiled on the grabbing plate in a single layer, then a camera and a structured light projector are started to shoot a particle picture containing structured light coding information and not containing the structured light coding information, and the size and the particle shape of the particles are calculated by using an image analysis method based on three-dimensional measurement of structured light to assist a plane image analysis method; after the photographing is finished, the power device pushes the grabbing plate into a coating cavity of the coating machine, then the distance between the grabbing plates when the particle flatting mechanism falls is smaller than the diameter of a single drug particle, or the particle flatting mechanism is directly attached to the grabbing plate, then the power device drives the grabbing plate to pull back, the drug particles automatically fall into the coating cavity of the coating machine, and the diameter of the particles is obtained once. After a certain time, repeating the above-mentioned action to obtain secondary particle diameter, and calculating the statistical value of coating thickness by using difference value of two particle diameters. When the coating thickness reaches the required thickness, the quality defect of the coated surface of the coating can be judged by the last image information, and the surface quality of the coating is obtained. In particular, the measuring device may be provided in plurality in the circumferential direction of the coating machine.
The power device comprises a transverse cylinder body fixedly mounted on a supporting box through a front panel 2, a through hole is formed in a piston rod of the transverse cylinder body, which is right aligned to the supporting box, and the piston rod of the transverse cylinder penetrates through the through hole and is fixedly connected with one end of the grabbing plate. The transverse cylinder can better drive the grabbing plate to move. Specifically, the power device may be an electric push rod or any other mode, and the power device is within the protection scope claimed by the present patent application.
Wherein, granule tiling mechanism is including setting up the granule tiling baffle 9 in the supporting box, granule tiling baffle 9 is located grab the top of board 7, granule tiling baffle 9 is L shape, the laminating of granule tiling baffle 9 one side and the lateral wall of capsule machine, be provided with the actuating mechanism who is used for driving granule tiling baffle along the motion of vertical direction on the supporting box. The driving mechanism drives the particle tiling baffle to move, so that drug particles can be tiled and fed in an auxiliary manner.
The supporting box is vertically provided with a guide hole in a penetrating mode, and the particle tiling baffle is fixedly provided with a guide rod in the guide hole in a sliding fit mode. The movement of the particle tiling baffle can be better guided.
Wherein, actuating mechanism includes fixed mounting at the step motor (not drawn) of 3 upper ends of support box, step motor's output shaft passes downwards support box fixedly connected with screw rod 11, the part that screw rod 11 is located the support box connects the cooperation soon to have the nut, granule tiling baffle upper end runs through and is provided with the unthreaded hole, nut fixed mounting be in the unthreaded hole. Step motor rotates, drives the screw rod and rotates, and the screw rod drives nut vertical movement, and then drives granule tiling baffle vertical movement.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not cause the essence of the corresponding technical solution to depart from the scope of the technical solution of the embodiments of the present invention, and are intended to be covered by the claims and the specification of the present invention.
Claims (7)
1. An on-line measurement method for coating thickness and coating quality is characterized by comprising the following steps:
s1: obtaining the particles from the coating cavity through a measuring device, and enabling the particles to be flatly laid on the grabbing plate;
s2: starting a camera and a structured light projector to obtain a particle picture containing structured light coded information and not containing the structured light coded information of the particles on the grabbing plate, and carrying out image processing analysis on the particle picture by using an image analysis method for assisting structured light three-dimensional measurement to obtain image information, wherein the image information comprises the average diameter and the morphology of the particles;
s3: obtaining the coating thickness by using the difference of the average diameters of the particles measured twice;
s4: if the coating thickness is larger than the specified thickness, judging the coating surface defects by using the image information obtained by the last image analysis so as to evaluate the coating surface quality;
s5: if the coating thickness is less than the prescribed thickness, steps S1-S3 are repeated until the coating thickness is greater than the prescribed thickness, and step S4 is performed.
2. The on-line measuring method of coating thickness and coating quality as claimed in claim 1, wherein in step S2, the particle picture containing the structured light coded information obtains the particle height size information through differential binarization, coded binary conversion, space coded image generation, triangular transformation and three-dimensional coordinate information, the particle picture without the structured light coded information obtains the two-dimensional transverse size of the particle through binarization, edge detection, and the particle diameter size is obtained by integrating and comparing the particle height size information and the two-dimensional transverse size information.
3. The utility model provides a measuring device of capsule thickness and capsule quality, a serial communication port, including setting up the supporting box on capsule machine lateral wall, supporting box one side fixed mounting has power device, the capsule machine lateral wall is just to having seted up the material mouth of getting to the supporting box, the supporting box is just right get the material mouth and be provided with the opening, it has the board of grabbing to get sliding fit in the material mouth, power device is used for driving grab the board and follow it slides to get the material mouth, the top panel is installed to supporting box upper end, install the image acquisition window on the top panel, the camera support is installed to supporting box upper end, install camera and structured light projector on the camera support, one side that the supporting box is close to the capsule machine still is provided with granule tiling mechanism.
4. A coating thickness and coating quality measuring device according to claim 3, wherein the power device comprises a transverse cylinder body fixedly mounted on a support box through a front panel, the support box is provided with a through hole facing a piston rod of the transverse cylinder, and the piston rod of the transverse cylinder passes through the through hole and is fixedly connected with one end of the grabbing plate.
5. The coating thickness and coating quality measuring device according to claim 3, wherein the particle spreading mechanism comprises a particle spreading baffle arranged in a support box, the particle spreading baffle is located above the grabbing plate, the particle spreading baffle is L-shaped, one side of the particle spreading baffle is attached to the outer side wall of the coating machine, and a driving mechanism for driving the particle spreading baffle to move in the vertical direction is arranged on the support box.
6. A device for measuring the thickness and quality of a coating according to claim 5, wherein the supporting box is vertically provided with a guide hole in a penetrating manner, and the particle laying baffle plate is fixedly provided with a guide rod which is vertically matched with the guide hole in a sliding manner.
7. The coating thickness and coating quality measuring device according to claim 5, wherein the driving mechanism comprises a stepping motor fixedly mounted at the upper end of a support box, an output shaft of the stepping motor passes downward through the support box and is fixedly connected with a screw, a part of the screw located in the support box is screwed and matched with a nut, an upper end of the particle flat-laying baffle plate is provided with a light hole in a penetrating manner, and the nut is fixedly mounted in the light hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010630652.9A CN111750785B (en) | 2020-07-03 | 2020-07-03 | On-line measuring method and measuring device for coating thickness and coating quality |
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| CN202010630652.9A CN111750785B (en) | 2020-07-03 | 2020-07-03 | On-line measuring method and measuring device for coating thickness and coating quality |
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| CN111750785A true CN111750785A (en) | 2020-10-09 |
| CN111750785B CN111750785B (en) | 2021-08-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115445902A (en) * | 2022-09-21 | 2022-12-09 | 重庆科技学院 | Three-dimensional size sorting method and device for strip-shaped particles |
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| WO2020107517A1 (en) * | 2018-11-30 | 2020-06-04 | 福州高意光学有限公司 | Optical system capable of implementing multi-line spot structured light function |
| CN212340932U (en) * | 2020-07-03 | 2021-01-12 | 重庆科技学院 | Measuring device for coating thickness and coating quality |
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| CN103090818A (en) * | 2013-01-18 | 2013-05-08 | 北京农业信息技术研究中心 | Method and device and system of coated seed quality measuring |
| EP3131070A1 (en) * | 2015-08-14 | 2017-02-15 | Bundesdruckerei GmbH | Device for testing a coating of a document |
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| CN108775870A (en) * | 2018-04-08 | 2018-11-09 | 雄安华讯方舟科技有限公司 | The monitoring method and system of coating pan |
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Effective date of registration: 20230719 Address after: 401332 No.98, Xiyuan 2nd Road, Shapingba District, Chongqing Patentee after: CHONGQING LIYUN NOZZLE Co.,Ltd. Address before: No. 20, East Road, University City, Chongqing, Shapingba District, Chongqing Patentee before: Chongqing University of Science & Technology |
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