CN118565347A - Device and method for comprehensive detection of strip straightness and width based on multi-line structured light - Google Patents
Device and method for comprehensive detection of strip straightness and width based on multi-line structured light Download PDFInfo
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- CN118565347A CN118565347A CN202410522942.XA CN202410522942A CN118565347A CN 118565347 A CN118565347 A CN 118565347A CN 202410522942 A CN202410522942 A CN 202410522942A CN 118565347 A CN118565347 A CN 118565347A
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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
- G01B11/022—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by means of tv-camera scanning
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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
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B11/27—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
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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
- G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
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Abstract
The invention discloses a plate band flatness and width comprehensive detection device and method based on multi-line structured light, belonging to the technical field of metallurgical detection, wherein the device comprises: the system comprises an industrial area array camera, a multi-line structured light source, a speed measuring unit, a PLC (programmable logic controller), an image processing server and a signal measuring unit; the device is characterized in that the multi-line structured light is projected on the surface of the plate belt, an industrial area array camera is adopted to collect images of the multi-line structured light on the surface of the plate belt, the flatness and the width of the plate belt at a plurality of positions are calculated by combining camera calibration and line structured light strip central line coordinate extraction, and the online detection and display of the flatness and the width of the plate belt are realized. The comprehensive detection device for the flatness and the width of the plate and the strip has the advantages of high detection precision, good real-time performance, simple overall structure and convenience in installation and maintenance, and can meet the flatness and the width detection requirements of the industrial production process of the plate and the strip.
Description
Technical Field
The invention relates to the technical field of metallurgical detection, in particular to a plate strip flatness and width comprehensive detection device and method based on multi-line structured light.
Background
Flatness is used as an important index for controlling the production of the plate and strip, accurate measurement is a necessary condition for closed-loop control of plate shape quality, and the method is also an essential process for realizing product quality evaluation and grading judgment. In addition, the width is used as the core dimension of the sheet and strip, and the flatness is measured, and in most production situations, the width is measured, closed-loop control and verification are required.
At present, the width and the flatness of the plate and strip are measured by respectively installing two meters, and a large installation space is needed. The flatness measurement of the plate and strip is mainly divided into a contact type and a non-contact type, but in any mode, the existing products are very expensive in selling price and later maintenance and upgrading, so that many iron and steel enterprises have to discard the use of some flatness detection devices at the expense of control precision.
For the contact type flatness measuring equipment, the signal measurement is direct, the precision is higher, but the manufacturing cost and accessories are expensive, the surface of strip steel is easy to scratch, the maintenance is difficult, and the contact type flatness measuring equipment is generally suitable for a cold rolling production line with a better working environment; the non-contact flatness measuring equipment is simple in structure, easy to maintain and convenient to install, is used for hot rolling production lines, but the existing non-contact equipment is high in frequency requirement on image acquisition, difficult to eliminate the influence of factors such as vibration, high in requirement on image data processing, and difficult to be applied in actual production.
Disclosure of Invention
The invention provides a plate and strip flatness and width comprehensive detection device and method based on multi-line structured light, which are used for solving the technical problem that the prior art is difficult to be well applied in actual production.
In order to solve the technical problems, the invention provides the following technical scheme:
on one hand, the invention provides a plate and strip flatness and width comprehensive detection device based on multi-line structured light, which comprises an industrial area array camera, a multi-line structured light source, a speed measurement unit, a PLC (programmable logic controller), an image processing server and a signal measurement unit;
the industrial area array camera, the multi-line structured light source and the speed measuring unit are arranged above a plate and strip running roller way, and the signal measuring unit is arranged in front of the speed measuring unit along the running direction of the plate and strip; the industrial area array camera, the multi-line structured light source, the speed measuring unit and the signal measuring unit are respectively in communication connection with the PLC; the industrial area array camera and the PLC are respectively in communication connection with the image processing server;
The signal measuring unit is used for detecting the position of the plate strip; the speed measuring unit is used for measuring the running speed of the plate belt; when the plate and strip head moves to the position where the signal measuring unit is located, the PLC controller turns on the multi-line structured light source and the industrial area array camera; after the speed measuring unit measures the running speed of the plate and strip, the PLC calculates shooting frequency according to the running speed of the plate and strip and the parameters of the multi-line structured light projected by the multi-line structured light source; the multi-line structured light source projects multi-line structured light to the surface of the plate belt in the direction perpendicular to the roller plane and the running direction of the plate belt; the industrial area array camera collects the surface image of the plate and strip containing the multi-line structured light according to the shooting frequency calculated by the PLC controller, and transmits the collected image to the image processing server; wherein, the optical axis of the industrial area array camera forms a preset included angle with the line structure light plane projected by the multi-line structure light source; when the tail part of the plate belt moves to the position where the industrial area array camera is located, the PLC controller turns off the multi-line structured light source and the industrial area array camera;
The image processing server is used for calculating and obtaining the flatness and the width of a plurality of positions in the full-length range of the plate belt based on the image acquired by the industrial area array camera and combined with the camera calibration result.
Further, the plate and strip flatness and width comprehensive detection device based on the multi-line structured light further comprises an installation platform; the mounting platform is arranged right above the plate belt running roller way and transversely spans the plate belt running roller way; the industrial area array camera and the multi-line structured light source are arranged in the mounting platform.
Further, the plate and strip flatness and width comprehensive detection device based on the multi-line structured light further comprises a display; the display is in communication connection with the image processing server; and after the image processing server calculates flatness and width of a plurality of positions in the full-length range of the plate strip based on the image acquired by the industrial area array camera and combined with the camera calibration result, the display is used for displaying the calculation result of the image processing server.
Further, the integrated plate and strip flatness and width detection device based on the multi-line structured light further comprises water cooling equipment, wherein the industrial area array camera and the multi-line structured light source are connected with the water cooling equipment; the water cooling equipment is used for cooling the industrial area array camera and the multi-line structured light source.
Further, the number of line structure light rays projected by the multi-line structure light source is not less than 3.
Further, the light planes of the line structure lights projected by the multi-line structure light source are parallel to each other, and the distances between the light planes of any two adjacent line structure lights are equal.
Further, the distance between the light planes of the adjacent two line structured lights is 30 to 300mm.
Further, the preset included angle is 20-70 degrees, and the shooting view field of the camera covers all line structure lights.
Further, the calculation formula of the shooting frequency is:
Wherein η represents a photographing frequency; v represents the running speed of the plate belt; l represents the distance between the light planes of two adjacent line structured lights; m represents the number of line structured light rays projected by the multi-line structured light source.
Further, the image processing server is specifically configured to:
firstly, extracting an interested region from an image acquired by the industrial area array camera by adopting a threshold segmentation algorithm; secondly, extracting line structure light center line coordinates of sub-pixel precision through a Gaussian operator based on the extracted region of interest; then, end point coordinates of intersection of the line structure light and two sides of the plate belt are obtained through edge point identification, and the width of the plate belt is calculated; and finally, calculating wave height and plate band flatness according to the line coordinates of the light central lines of the plurality of line structures.
On the other hand, the invention also provides a plate band flatness and width comprehensive detection method realized by the plate band flatness and width comprehensive detection device based on the multi-line structured light, which comprises the following steps:
s0: calibrating the measurement system after the detection device is installed, and acquiring camera internal parameters, external parameters and light plane calibration parameters;
s1: after calibration is completed, starting a signal measuring unit and a speed measuring unit, and when the head of the plate and the belt moves to the position where the signal measuring unit is located, opening a multi-line structured light source and an industrial area array camera by a PLC;
S2: when the head of the plate and the belt moves to the position where the speed measuring unit is located, calculating the shooting frame rate of the industrial area array camera according to the acquired plate and belt running speed, and controlling the industrial area array camera to continuously shoot through the PLC controller to acquire images;
s3: transmitting the acquired images to an image processing server, calculating parameters of the width, the wave height and the flatness of the plate band through image processing, and displaying the parameters on a display;
S4: when the tail part of the plate belt moves to the position of the signal measuring unit, the delay closing function of the multi-line structured light source and the industrial area array camera is started, and when the tail part of the plate belt moves to the position of the industrial area array camera, the multi-line structured light source and the industrial area array camera are closed, and shooting is finished.
The technical scheme provided by the invention has the beneficial effects that at least:
The invention can realize the simultaneous detection of flatness and width in the production process of the plate and strip materials such as leveling, straightening, heat treatment and the like, can effectively reduce the image sampling frequency, eliminates the influence of factors such as vibration and the like on the flatness detection precision, and has the advantages of small equipment installation space requirement, high detection precision and good maintainability.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a plate and strip flatness and width integrated detection device based on the multi-line structured light according to an embodiment of the present invention.
Reference numerals illustrate:
1. an industrial area array camera; 2. a multi-line structured light source; 3. a speed measurement unit;
4. a PLC controller; 5. an image processing server; 6. a display; 7. a mounting platform;
8. Water cooling equipment; 9. a signal measurement unit; 10. a plate and strip production control PLC workstation;
11. and (5) a plate belt running roller way.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
First, it should be noted that, in the embodiments of the present invention, words such as "exemplary," "for example," and the like are used to indicate an example, instance, or illustration. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the use of the term "exemplary" is intended to present concepts in a concrete fashion. Furthermore, in embodiments of the present invention, the meaning of "and/or" may be that of both, or may be that of either, optionally one of both.
Furthermore, in the embodiments of the present invention, "image", "picture" may be sometimes used in combination, and it should be noted that the meaning to be expressed is consistent when the distinction is not emphasized. "of", "corresponding (corresponding, relevant)" and "corresponding (corresponding)" are sometimes used in combination, and it should be noted that the meaning of the expression is consistent when the distinction is not emphasized.
The embodiment provides a device for comprehensively detecting flatness and width of a plate strip based on multi-line structured light, as shown in fig. 1, the device comprises: the system comprises an industrial area array camera 1, a multi-line structured light source 2, a speed measuring unit 3, a PLC controller 4, an image processing server 5, a display 6, a mounting platform 7, a water cooling device 8, a signal measuring unit 9 and a plate and strip production control PLC workstation 10.
The speed measuring unit 3 may be a doppler laser velocimeter, which is not limited to the specific type of the embodiment; the mounting platform 7 is mounted right above the roller way transversely across the plate and belt running roller way 11; the industrial area array camera 1 and the multi-line structured light source 2 are arranged in the mounting platform 7; the speed measuring unit 3 is installed above the plate and belt running roller way 11, and the signal measuring unit 9 is installed in front of the speed measuring unit 3 along the plate and belt running direction. The industrial area array camera 1, the multi-line structured light source 2, the speed measuring unit 3, the signal measuring unit 9 and the plate and strip production control PLC workstation 10 are respectively in communication connection with the PLC controller 4 through signal wires, and the PLC controller 4 respectively controls the on-off states of the industrial area array camera 1, the multi-line structured light source 2 and the speed measuring unit 3 and acquires plate and strip production data; the industrial area array camera 1 and the display 6 are respectively connected with the image processing server 5 in a communication way; the image processing server 5 is connected with the PLC controller 4 through the Ethernet; the industrial area array camera 1 and the multi-line structured light source 2 are connected with a water cooling device 8, and the water cooling device 8 is used for cooling the device.
When in operation, the speed measuring unit 3 is used for measuring the running speed of the plate belt; when the strip head moves to the position where the signal measuring unit 9 is located, the PLC 4 turns on the multi-line structured light source 2 and the industrial area array camera 1; after the speed measuring unit 3 measures the running speed of the plate and strip, the PLC 4 calculates the shooting frequency according to the running speed of the plate and strip and the parameters of the multi-line structured light projected by the multi-line structured light source 2; the multi-line structured light source 2 projects multi-line structured light to the surface of the plate belt in the direction perpendicular to the roller plane and the running direction of the plate belt; the industrial area array camera 1 collects the surface image of the plate strip containing the multi-line structured light according to the shooting frequency calculated by the PLC 4 and transmits the collected image to the image processing server 5; wherein, the optical axis of the industrial area array camera 1 forms a preset included angle with the line structure light plane projected by the multi-line structure light source 2; when the tail of the plate belt runs to the position of the industrial area array camera 1, the PLC 4 turns off the multi-line structured light source 2 and the industrial area array camera 1.
The image processing server 5 is used for calculating flatness and width of a plurality of positions within the full length range of the plate belt based on the image acquired by the industrial area array camera 1 and combining with the camera calibration result, and displaying the flatness and width through the display 6.
Specifically, in this embodiment, the number of line structured light rays of the multi-line structured light source 2 is 3 or more, the light planes of each line structured light are parallel to each other and have equal distances, the distance between two light rays is configured within the range of 30-300 mm according to the detection requirement, and the line structured light rays are flexibly configured according to different detection working conditions. The optical axis of the industrial area array camera 1 and the linear structure light plane form a certain included angle for oblique shooting, wherein the included angle range is 20-70 degrees, and the shooting view field covers all light rays. The calculation formula of the shooting frequency is as follows:
Wherein η represents a photographing frequency; v represents the running speed of the plate belt; l represents the distance between two adjacent light rays of the multi-line structured light; m is the number of the light rays with the multi-line structure.
Based on the above, the process of realizing the comprehensive detection of the flatness and the width of the plate strip by using the detection device is as follows:
s0: calibrating the measurement system after the detection device is installed, and acquiring camera internal parameters, external parameters and light plane calibration parameters;
S1: after calibration is completed, starting a signal measuring unit 9 and a speed measuring unit 3, and when the head of the plate and the belt moves to the position where the signal measuring unit 9 is located, starting the multi-line structured light source 2 and the industrial area array camera 1 by the PLC 4;
S2: when the head of the plate and the belt moves to the position of the speed measuring unit 3, calculating the shooting frame rate of the industrial area array camera 1 according to the acquired plate and belt running speed, and controlling the industrial area array camera 1 to continuously shoot through the PLC 4 for image acquisition;
s3: the acquired images are transmitted to an image processing server 5, parameters of the width, the wave height and the flatness of the plate band are calculated through image processing, and the parameters are displayed on a display 6;
S4: when the tail part of the plate and the strip runs to the position of the signal measuring unit 9, the delay closing function of the multi-line structured light source 2 and the industrial area array camera 1 is started, and when the tail part of the plate and the strip runs to the position of the industrial area array camera 1, the multi-line structured light source 2 and the industrial area array camera 1 are closed, and shooting is finished.
The process for calculating the parameters of the width, the wave height and the flatness of the plate strip through image processing specifically comprises the following steps: firstly, extracting a region of interest (ROI) from an image acquired by the industrial area array camera by adopting a threshold segmentation algorithm; secondly, extracting line structure light center line coordinates with sub-pixel precision through a Gaussian operator based on the extracted ROI; then, end point coordinates of intersection of the line structure light and two sides of the plate belt are obtained through edge point identification, and the width of the plate belt is calculated; and finally, calculating wave height and plate band flatness according to the line coordinates of the light central lines of the plurality of line structures.
Specifically, in the present embodiment, the calculation process of the wave height and the flatness of the strip is as follows:
P measuring channels are taken on the line structure light along the width direction of the plate band, namely P fibers are taken as detection objects along the width direction (P values are freely configured according to detection requirements and are optionally 10-200, and the embodiment is not particularly limited), wherein the wave height h is calculated by adopting the following formula:
h＝max(zi,j)
Wherein z i,j is the measurement height of the j-th measurement point of the fiber i in the n set +1 measurement points within the detection length l set＝nset.l, n set +1 represents the number of line structure lights within the detection length range, and n set represents the number of adjacent line structure light distances.
The flatness F i of the fiber i is calculated using the following formula:
Wherein L center is the length of the fiber where the symmetry plane of the board band width is located, L i is the length of the fiber i, and the following formula is adopted for calculation:
Wherein z i,j+1 is the measurement height of the j+1th measurement point of the fiber i in the n set +1 measurement points within the range of the detection length l set＝nset.l.
In summary, the embodiment provides a device and a method for comprehensively detecting the flatness and the width of a plate strip based on multi-line structured light, wherein the device projects multi-line structured light on the surface of the plate strip, an industrial area array camera is adopted to collect images containing multi-line structured light on the surface of the plate strip, camera calibration and line structured light strip central line coordinate extraction are combined, flatness and width of a plurality of positions of the whole length of the plate strip are calculated, and online detection and display of the flatness and the width of the plate strip are realized. The device adopting the embodiment can effectively reduce the image sampling frequency, eliminate the influence of factors such as vibration on the flatness detection precision, and has the advantages of small equipment installation space requirement, high detection precision and good maintainability.
Furthermore, it should be noted that the present invention can be provided as a method, an apparatus, or a computer program product. Accordingly, embodiments of the invention may take the form of an entirely or partially hardware embodiment, an entirely or partially software embodiment or an embodiment combining software and hardware aspects. Furthermore, when implemented in software, embodiments of the invention may take the form of a computer program product on one or more computer-usable storage media having computer-usable program code embodied therein. The computer program product comprises one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the processes or functions described in accordance with embodiments of the present invention are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wired (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more sets of available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. The semiconductor medium may be a solid state disk.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should also be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or terminal device that comprises the element. Furthermore, the term "and/or" is merely an association relation describing the association object, and means that three kinds of relations may exist, for example, a and/or B may mean: there are three cases, a alone, a and B together, and B alone, wherein a, B may be singular or plural. In addition, the character "/" herein generally indicates that the associated object is an "or" relationship, but may also indicate an "and/or" relationship, and may be understood by referring to the context. "at least one" means one or more, and "a plurality" means two or more. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural.
Furthermore, it should be understood that, in various embodiments of the present invention, the sequence number of each process described above does not mean that the execution sequence is determined by the function and the internal logic of each process, and should not limit the implementation process of the embodiments of the present invention.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus, device and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, e.g., the division of functional blocks/units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another device, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The method may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a stand alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. The storage medium includes a usb disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, etc., which can store program codes.
It is finally pointed out that the above description of the preferred embodiments of the invention, it being understood that although preferred embodiments of the invention have been described, it will be obvious to those skilled in the art that, once the basic inventive concepts of the invention are known, several modifications and adaptations can be made without departing from the principles of the invention, and these modifications and adaptations are intended to be within the scope of the invention. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Claims (10)
1. The utility model provides a board area straightness and width comprehensive testing device based on multi-line structured light, its characterized in that, board area straightness and width comprehensive testing device based on multi-line structured light includes: the system comprises an industrial area array camera, a multi-line structured light source, a speed measuring unit, a PLC (programmable logic controller), an image processing server and a signal measuring unit;
The industrial area array camera, the multi-line structured light source and the speed measuring unit are arranged above a plate and belt running roller way; the signal measuring unit is arranged in front of the speed measuring unit along the running direction of the plate and strip; the industrial area array camera, the multi-line structured light source, the speed measuring unit and the signal measuring unit are respectively in communication connection with the PLC; the industrial area array camera and the PLC are respectively in communication connection with the image processing server;
The signal measuring unit is used for detecting the position of the plate strip; the speed measuring unit is used for measuring the running speed of the plate belt; when the plate and strip head moves to the position where the signal measuring unit is located, the PLC controller turns on the multi-line structured light source and the industrial area array camera; after the speed measuring unit measures the running speed of the plate and strip, the PLC calculates shooting frequency according to the running speed of the plate and strip and the parameters of the multi-line structured light projected by the multi-line structured light source; the multi-line structured light source projects multi-line structured light to the surface of the plate belt in the direction perpendicular to the roller plane and the running direction of the plate belt; the industrial area array camera collects the surface image of the plate and strip containing the multi-line structured light according to the shooting frequency calculated by the PLC controller, and transmits the collected image to the image processing server; wherein, the optical axis of the industrial area array camera forms a preset included angle with the line structure light plane projected by the multi-line structure light source; when the tail part of the plate belt moves to the position where the industrial area array camera is located, the PLC controller turns off the multi-line structured light source and the industrial area array camera;
The image processing server is used for calculating and obtaining the flatness and the width of a plurality of positions in the full-length range of the plate belt based on the image acquired by the industrial area array camera and combined with the camera calibration result.
2. The multi-line structured light based integrated strip flatness and width detection apparatus of claim 1, wherein, the plate and strip flatness and width comprehensive detection device based on the multi-line structured light further comprises an installation platform; the mounting platform is arranged right above the plate belt running roller way and transversely spans the plate belt running roller way; the industrial area array camera and the multi-line structured light source are arranged in the mounting platform.
3. The multi-line structured light based integrated strip flatness and width detection apparatus of claim 1, wherein, the plate and strip flatness and width comprehensive detection device based on the multi-line structured light further comprises a display; the display is in communication connection with the image processing server; and after the image processing server calculates flatness and width of a plurality of positions in the full-length range of the plate strip based on the image acquired by the industrial area array camera and combined with the camera calibration result, the display is used for displaying the calculation result of the image processing server.
4. The multi-line structured light-based integrated detection device for flatness and width of a plate strip of claim 1, further comprising a water cooling device, wherein the industrial area camera and the multi-line structured light source are connected with the water cooling device; the water cooling equipment is used for cooling the industrial area array camera and the multi-line structured light source.
5. The integrated detection device for flatness and width of a strip based on multi-line structured light according to claim 1, wherein the number of line structured light projected by the multi-line structured light source is not less than 3.
6. The integrated strip flatness and width detection apparatus of claim 5, wherein the light planes of each line structured light projected by the multi-line structured light source are parallel to each other, and the distances between the light planes of any two adjacent line structured lights are equal.
7. The integrated multi-line structured light-based strip flatness and width detection apparatus of claim 6, wherein a distance between light planes of adjacent two line structured lights is 30-300 mm.
8. The multi-line structured light based integrated plate and strip flatness and width detection device of claim 1, wherein the preset included angle is 20-70 degrees, and the shooting field of view of the camera covers all line structured light.
9. The multi-line structured light-based integrated plate and strip flatness and width detection device of claim 1, wherein the calculation formula of the shooting frequency is:
Wherein η represents a photographing frequency; v represents the running speed of the plate belt; l represents the distance between the light planes of two adjacent line structured lights; m represents the number of line structured light rays projected by the multi-line structured light source.
10. The multi-line structured light based integrated board strip flatness and width detection device of claim 1, wherein the image processing server is specifically configured to:
firstly, extracting an interested region from an image acquired by the industrial area array camera by adopting a threshold segmentation algorithm; secondly, extracting line structure light center line coordinates of sub-pixel precision through a Gaussian operator based on the extracted region of interest; then, end point coordinates of intersection of the line structure light and two sides of the plate belt are obtained through edge point identification, and the width of the plate belt is calculated; and finally, calculating wave height and plate band flatness according to the line coordinates of the light central lines of the plurality of line structures.
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