CN114676957A - Clock and watch product assembly quality data analysis system - Google Patents
Clock and watch product assembly quality data analysis system Download PDFInfo
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Abstract
The invention discloses a system for analyzing assembly quality data of a clock product, which comprises: a measurement module: the automatic detection module of accuracy, clock and watch pointer assembly parallelism measuring module, analysis module are walked to clock and watch: the system comprises a data comprehensive analysis module, a data sorting and counting module and a comprehensive management module: the system comprises a user authority management module, a measurement data module, a measurement report generation management module and a data interaction management module; the invention has the advantages that the full-chain quality data analysis of the clock needle mounting quality and the travel accuracy is realized, the product quality data platform is utilized to analyze the reasons which are easy to cause problems in the production process, the digitization, the networking and the intellectualization of the production process are promoted, the production process technology is improved and optimized, the process information is automatically detected and stored, the online real-time monitoring feedback is realized, the quality in the production process is controllable and stable, the production efficiency and the product quality are improved, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of face recognition, in particular to a clock product assembly quality data analysis system.
Background
The time difference is one of the most main indexes representing the travel quality of the clock, and is usually evaluated in two modes of instantaneous time difference and actual travel time difference, the instantaneous time difference can be measured on a time difference meter (time difference tester), the purchased movement quality is mainly detected, the measurement efficiency is high, and the travel time is inaccurate due to the influence of a plurality of process links such as subsequent pointer assembly, and the like, so that the method cannot completely represent the actual travel time error of the clock; actually walking the sun difference and measuring and basically not having suitable measuring equipment at present, some enterprises that have the ability adopt artifical visual and standard time to compare (24h), according to certain proportion spot check, consuming time and wasting effort, measurement accuracy is low, and easily receives artificial subjective influence. The assembly quality (parallelism) of the pointer is also in manual visual qualitative inspection at present, and inspectors are easy to fatigue and misjudge. Therefore, the applicant provides a clock product assembly quality data analysis system, and solves the problems of manual visual inspection, subjective judgment, easy fatigue and the like in the prior art.
Disclosure of Invention
Technical scheme (I)
The invention is realized by the following technical scheme: a horological product assembly quality data analysis system, the system comprising:
a measurement module: the automatic detection module for the travel accuracy of the clock and the measurement module for the assembly parallelism of the clock pointer;
An analysis module: the system comprises a data comprehensive analysis module and a data sorting and counting module;
the comprehensive management module comprises: the system comprises a user authority management module, a measurement data module, a measurement report generation management module and a data interaction management module.
As a further explanation of the above solution, the automatic detection module for the timepiece travel accuracy comprises:
a first hardware module: the device is used for collecting the clock pointer dial plate images and transmitting the clock pointer dial plate images to a computer through a data line;
the first image recognition processing module: the system is used for processing the acquired image, extracting features and identifying reading;
the material tray automatic transmission module: the automatic blanking and feeding device is used for automatic blanking and automatic feeding of clocks and watches and transmission of clocks and watches.
As a further explanation of the above scheme, the first hardware module specifically includes:
an industrial camera;
a lens mounted to the industrial camera;
LED light sources arranged at two sides of the lower part of the lens;
the industrial camera is a CCD camera;
the projection mode of the LED light source is that the LED light sources on two sides project laterally at the same angle.
As a further explanation of the above solution, the first image recognition processing module includes:
an image preprocessing module: useful characteristic information for removing noise influence on the clock image and highlighting the target image;
An image processing module: the device is used for performing image morphological operation, pointer straight line detection, dial scale line fitting and pointer rotation center fitting on a clock image;
dial plate reading identification module: for reading the dial reading.
As a further explanation of the above scheme, the tray automatic transmission module includes a feeding area, a detection area, a temporary storage area, and a sorting area.
As a further explanation of the above scheme, the automatic transportation method of the tray automatic transportation module is as follows:
s1: manually feeding, wherein a material tray is transferred to a conveying line through a feeding mechanism and conveyed to a detection area;
s2: the industrial camera in the detection area takes a first photo of every 4 dials in the material tray at the same time;
s3: transferring the disk after being beaten to a stacking area of the temporary storage position;
s4: before the material tray is stored in the temporary storage position for 24 hours, the material tray is conveyed to a detection area to be detected;
s5: when the time reaches about 24 hours, starting to shoot by an industrial camera in the detection area, sequentially shooting the material trays for the second time, carrying out image processing by the upper computer, judging the time-lapse accuracy of the dial plate at the corresponding position, and transferring the unqualified dial plate to the secondary grade by the blanking mechanism;
s6: and (4) conveying the material discs of the qualified dial plates to qualified positions for storage through a blanking mechanism.
As a further description of the above solution, the timepiece hand assembly parallelism measuring module:
a second hardware module: the clock pointer image acquisition device is used for acquiring clock pointer images and transmitting the clock pointer images to a computer through a data line;
the second image recognition processing module: the method is used for processing the acquired images, and extracting features and identifying readings.
As a further illustration of the above solution, the second hardware module comprises:
a CMOS industrial camera;
a low distortion prime lens mounted on the CMOS industrial camera;
and LED light sources with parallel surfaces on two sides of the lens are installed.
As a further explanation of the above solution, the second image recognition processing module includes:
the camera control submodule is: the camera is used for controlling initialization and starting of the camera;
an image acquisition submodule: for a single acquisition of an image;
an image preprocessing submodule: the image preprocessing module is used for preprocessing the acquired image;
and a result output submodule: for outputting qualified, unqualified and abnormal measurement results
The data statistics storage submodule comprises: the method is used for counting the conditions of qualification, disqualification and abnormity of the pointer.
As a further explanation of the above scheme, the system flow is as follows:
updating data, including updating experience data and setting parameters;
Newly building a measurement project;
analyzing data and generating a report;
and data management, including uploading measurement data and uploading experience data.
(III) advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
the clock product assembly quality data analysis platform is established by combining detection data acquired by a clock travel accuracy automatic detection system and a clock pointer parallelism online automatic detection system, the whole-chain quality data analysis of clock needle mounting quality and travel accuracy is carried out, the product quality data platform is used for analyzing the reasons which are easy to cause problems in the production process, the digitization, networking and intelligence of the production process are promoted, the production process technology is improved and optimized, process information is automatically detected and stored, and online real-time monitoring feedback is carried out, so that the quality of the production process is controllable and stable, the production efficiency and the product quality are improved, and the production cost is reduced.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a system architecture diagram according to an embodiment of the present invention;
FIG. 2 is a diagram of a first hardware module according to the embodiment of the present invention;
FIG. 3 is a diagram of a first hardware module illumination model according to an embodiment of the present invention;
FIG. 4 is a system hierarchy diagram according to an embodiment of the present invention;
FIG. 5 is a flowchart of image recognition processing software according to an embodiment of the present invention;
FIG. 6 is a flow chart of an embodiment of the present invention for automatic transmission;
fig. 7 is a route diagram of an automatic tray transportation system according to an embodiment of the present invention;
FIG. 8 is a diagram of a second hardware module according to the embodiment of the present invention;
FIG. 9 is a diagram of an image processing measurement configuration according to an embodiment of the present invention;
FIG. 10 is a diagram of a standardized flow architecture according to an embodiment of the present invention.
Detailed Description
Example 1
The clock product assembly quality data analysis platform is established by combining detection data acquired by a clock travel accuracy automatic detection system and a clock pointer parallelism online automatic detection system, the whole-chain quality data analysis of clock needle mounting quality and travel accuracy is carried out, the product quality data platform is used for analyzing the reasons which are easy to cause problems in the production process, the digitization, networking and intelligence of the production process are promoted, the production process technology is improved and optimized, process information is automatically detected and stored, and online real-time monitoring feedback is carried out, so that the quality of the production process is controllable and stable, the production efficiency and the product quality are improved, and the production cost is reduced. The clock product assembly quality data analysis platform has the functions of control, measurement, comprehensive analysis, decision adjustment and the like, and is divided into a measurement module, an analysis module and a comprehensive management module. The internal architecture of the product quality data analysis platform is shown in fig. 1.
A system for analyzing quality data of a timepiece product assembly, the system comprising: the device comprises a measuring module, an analyzing module and a comprehensive management module.
1. A measurement module: the automatic detection module for the travel accuracy of the clock and the measurement module for the assembly parallelism of the clock pointer;
1.1 automatic detection module for clock travel accuracy
1.1.1 first hardware Module
Referring to fig. 2, the first hardware module: the device is used for collecting the clock pointer dial plate images and transmitting the clock pointer dial plate images to a computer through a data line; the first hardware module is specific to: an industrial camera; a lens mounted to the industrial camera; LED light sources arranged at two sides of the lower part of the lens; the industrial camera is a CCD camera; the projection mode of the LED light source is that the LED light sources on two sides project laterally at the same angle. The clock pointer image acquisition hardware system consists of three main modules, namely a clock pointer dial plate, an image acquisition device and a computer. The image acquisition equipment mainly comprises an industrial camera, an optical lens, a high-brightness uniform light source system and the like. The acquisition of the initial clock hand dial image is the basis of the whole reading identification system. Many factors in the acquisition process influence the subsequent image processing and identification process, for example, the image is not clear due to low resolution of an optical lens, and the characteristic information is lost; improper lighting angle can cause the watch to reflect light or the pointer to shadow, etc. Therefore, in order to simplify the whole system identification process and reduce the processing difficulty, the acquisition scheme of the system image must be designed and reasonable acquisition equipment must be selected. The clock pointer dial plate is used as a system identification processing object in the clock travel accuracy automatic detection system, the clock pointer tip is very fine, the pointer has a certain thickness in the lateral direction, the dial plate has a plurality of scale marks with different lengths, the scale marks are fine and dense, and meanwhile, a glass watch cover is arranged on the outer surface. Therefore, when image acquisition is carried out, it is of great significance to discuss and select a proper light source, a proper projection mode and a proper camera.
(1) Light source selection
The purpose of illumination by using the light source is to form enough contrast between different areas of the clock dial, so that the characteristic information of the pointer and the dial is highlighted, and convenience is provided for processing and identification of an identification system. Therefore, selecting a good light source and designing a lighting mode become an indispensable and extremely important step in system design. The light sources are various, and a halogen light source, a fluorescent light source, an RGB three-color Light Emitting Diode (LED) light source, and the like are commonly used light source types. The LED is a novel energy-saving and high-efficiency light source, and has wide attention and application in production and life. LEDs have many advantages in performance, such as longer service life, low power consumption, no radiation, energy saving, and environmental protection. In the related fields of machine vision measurement and the like, the LED light source is used more and more, and in combination with the aspects of cost and performance, the LED light source is selected as the machine vision light source.
(2) Light irradiation mode
The ideal light source illumination scheme can greatly simplify the post-processing workload of the whole system. The design process of the illumination scheme of the light source is usually determined according to the characteristics of the specific identified object in the system.
The surface reflection can be classified into two types of diffuse reflection and specular reflection according to the difference of the reflection coefficient. Because the measured plane is flat and has different smoothness, the incident light can generate diffuse reflection and mirror reflection in different reflection modes. Strong reflection interference can cause the measured surface characteristics to be unclear. The ability of each light source to propagate through different media is also different. This property can be used to distinguish between certain hard-to-distinguish different parts, where light in one medium refracts as it passes through another medium.
The illumination mode of the automatic detection system for the travel accuracy of the project clock is mainly designed from the aspects of the view field of a camera lens, the arrangement position of a light source, the angle between the light source and the clock dial of the clock to be detected, mirror reflection and the like. The research object of the project is a clock pointer type dial plate, a watch cover is a transparent glass plane, a pointer and the dial plate are not in the same plane, when a single-side light source is adopted for projection, one side of the dial plate is brighter, the other side of the dial plate is darker, and the pointer can generate shadow on the dial plate on the side opposite to the position of the light source, so that the identification process of the whole system is more complicated and obviously unreasonable. There are four general types of illumination source structures. In order to ensure that the surface of the dial plate obtains uniform brightness through illumination, the system selects the light source scheme of selecting to irradiate light sources at two sides on the dial plate to be measured at a certain same angle by combining the four illumination light source structure forms, and the influence of mirror reflection of the dial plate is effectively eliminated. Meanwhile, the shadow of the pointer on the plane of the dial plate is avoided. Fig. 3 is a schematic diagram illustrating a bilateral LED light source and a same-angle lateral projection scheme adopted in the present embodiment.
The industrial camera is an indispensable component in industrial technology, and the quality of the camera directly affects the resolution and the image quality of the acquired image, and finally the project result is affected. Commonly used industrial cameras are of CMOS (complementary Metal Oxide silicon) and CCD (Charge-Coupled Devices) type. Both CMOS and CCD are made up of a series of light sensitive elements, which are areas where charge is collected, the charge being proportional to the light impinging on the area, and these charges are then obtained in a discrete or sampled manner.
CMOS is a commonly used semiconductor light sensor that records light changes in digital cameras. However, in the image processing process using the above-mentioned method for rapid change, some noise often occurs due to overheating caused by too frequent current change. A CCD is essentially an image sensor and stores and transfers information by means of charge packets as the main carrier. The CCD has extremely high sensitivity, a large dynamic range and a wide spectrum response, can quickly complete the conversion of electric signals in the light acquisition process, and has the main advantages of small volume, low power consumption, low required working voltage, low cost and the like of a camera, so that the CCD is more widely applied to machine vision. Based on the superiority of the CCD camera in vision measurement, the CCD camera is applied to an image acquisition system of the system to acquire and acquire images.
In the whole machine vision system, the optical lens is an important imaging component of the image acquisition equipment, and the imaging quality can be effectively improved by selecting a proper lens. When selecting a shot, the following seven factors are mainly referred to:
(1) focal length: the lens focal length refers to the distance from the center of the lens to the focal point. The focal length of the lens is mainly determined by parameters such as the field angle, the imaging and the depth of field. The focal length is generally denoted by f: l/(1 + α/β). When the same shot target at the same distance is shot, the image formed by the long focal length of the lens is large, and the pixel formed by the short focal length of the lens is small.
(2) Visual field: the field of view depends on the size of the normalized sensitive surface and the field of view of the lens, and is the maximum range covered by the digital image output by the image acquisition equipment, and the breadth (V multiplied by H) of the actual object surface covered by the common acquisition equipment represents the imaging field of view range.
(3) Distance: the distance is divided into an object-to-image distance and a working distance. The object-to-image specifically refers to the distance from the measured object to the sensor inside the camera. The working distance refers to the distance from the measured object to the front end of the camera, and since the focal length parameter is used in the project, the working distance must be selected as the distance standard in the specific calculation.
(4) Distortion: generally, the distortion of an optical lens is minimal at the optical center and increases as the distance from the area on the lens to the primary optical axis increases. Therefore, depending on the external dimensions of the part to be measured, a high design requirement is required for a certain area of the edge, and the distortion in this range is required to be less than 0.05%.
Distortion is defined as the difference between the actual image height and the ideal image height, and the ratio of the ideal image height, expressed as a percentage, and the relative distortion is calculated as: dist ═ y' -y0')/y0'×100％。
(5) Magnification: the magnification is the ratio of the imaging size of the object passing through the lens to the size of the object during imaging. The maximum magnification of a camera is a magnification under the condition that the image is clearly formed at the maximum focal length and the shooting distance is shortest.
(6) Depth of field: refers to the range of distances of an object measured in front of the optical lens along the lens axis from which a sharp image can be obtained. The depth of field is related to the focal length, aperture size and working distance of the objective lens. The smaller the aperture (the larger the F-number), or the larger the working distance, the larger the depth of field.
The depth of field Δ is divided into a front depth of field Δ L1 and a rear depth of field Δ L2, and the calculation formula is: Δ L1＝p2σ'/(f2F+pσ')；ΔL2＝p2σ'/(f2F-pσ')；Δ＝ΔL1+ΔL2。
In the formula, F is the focal length of the objective lens, F is the F number of the objective lens, sigma' is the allowable circle diameter of dispersion on an image surface, and the minimum value on a CCD or a CMOS is the pixel size.
(7) Environment: in the application of vision systems, there are many environmental factors, such as reflections, light, temperature, etc. Environmental factors can affect imaging. Different environmental factors are considered and different focal length lenses are selected.
1.1.2 first image recognition processing Module
The first image recognition processing module is used for processing the acquired image, and performing feature extraction and reading recognition; the image preprocessing module is included: useful characteristic information for removing noise influence on the clock image and highlighting the target image; an image processing module: the device is used for performing image morphological operation, pointer straight line detection, dial scale line fitting and pointer rotation center fitting on a clock image; dial plate reading identification module: for reading the dial reading. The module comprises the following contents:
(1) software development environment
The Visual Studio software development environment is a Microsoft Windows application program development environment, provides high-efficiency intelligent high-level development tools, debugging functions, databases and various visualization program development innovation functions, comprises most of tools required in the whole software life cycle, such as UML tools, code management and control tools, Integrated Development Environment (IDE) and the like, and is the integrated development environment of the Windows platform application program which is most popular in the current application. Moreover, most image processing libraries are written based on C and C + +, C + + programming is adopted for better compatibility, and the execution efficiency of codes is high. The project writes a set of MFC executable programs by using a C + + language under a Visual Studio software development environment.
The language command of the Visual Studio software is easy to master and has very strong readability. Meanwhile, the software acquisition toolbox contains abundant functions, so that convenience is brought to image acquisition. The software processing tool box has image processing functions of different types and data formats. When the target image is collected, analyzed and processed, specific operation can be completed through calling of software functions, so that information details in the image are identified, related algorithms are combined, and related programs are written by using C + + language to realize statistics and analysis of data through calling of the functions, so that image data analysis, identification and integration processes are completed.
Referring to fig. 4, according to the actual development situation of the project, the project designs a layered software framework implemented by using an object-oriented technology, so that the layered software framework has flexible portability and certain reusability. According to specific detection requirements and tasks, a layered framework for establishing control software of the clock travel accuracy automatic detection system is provided. The structure is divided into from top to bottom: a task layer, a strategy layer, a behavior layer and the like. The task layer firstly receives and analyzes an instruction sent by an operator, and carries out task decomposition on the basis of a detection process index; then integrating the current information fed back by the strategy layer; finally, the action sequence which can be understood by the strategy layer is constructed and transmitted to the strategy layer. The strategy layer accepts the action sequence sent by the task layer, decomposes each action into the actions of a plurality of components and transmits the actions to the action layer, and the strategy layer is only related to the encapsulated action interface and does not relate to the hardware information of any action layer. And the action layer controls the actions of components such as each transmission mechanism, the CCD industrial camera, the mechanical arm sorting mechanism and the like according to the commands transmitted from the strategy layer.
(2) The clock pointer image identification processing system is mainly completed by the following three parts: namely an image preprocessing module, an image processing module and a reading identification module. The image recognition processing flow is shown in fig. 5.
1.1.3 charging tray automatic transmission module
The material tray automatic transmission module: the automatic blanking and feeding device is used for automatic blanking and feeding of clocks and watches and transmission of clocks and watches. Including a loading area, a detection area, a buffer area, and a sorting area, please refer to fig. 6. The whole operation control is carried out by adopting a Programmable Logic Controller (PLC), a micro-electronic technology and a computer technology are applied on the basis of a microprocessor, various control functions are realized by software, and the adaptability is strong. The industrial control computer is composed of a central processing unit, a memory, an input/output unit, a power supply, a programmer and the like, and is specially designed for application in an industrial environment. The PLC control mode has the advantages of small volume, high reliability, strong universality, lower cost, short development period of software and hardware, simple and convenient installation and maintenance, strong anti-interference capability on an industrial field and the like. Please refer to fig. 7 for the entire system automatic transmission flowchart.
The outline of the operation process of the automatic tray transmission system is as follows:
s1: an operator places dial workpieces on a material tray and then stacks the dial workpieces on a material tray position of a feeding area to wait for feeding, and the material tray is transferred to a conveying line through a feeding mechanism and conveyed to a detection area to be detected;
S2: when the material tray moves to the detection area through the conveying line, an industrial camera arranged in the detection area simultaneously takes a first photo for every 4 dial plates in the material tray;
s3: the clamping jaw module conveys the batched material tray to a temporary storage area through a conveying line, and then the material tray is conveyed to a temporary storage position, and the module mechanism of the temporary storage position transfers the material tray to a stacking area of the temporary storage position;
s4: before the material tray is stored for 24 hours in the temporary storage position, the module mechanism of the temporary storage position transfers the material tray to a conveying line, and the corresponding material tray is conveyed to a detection area for waiting for detection through the conveying line;
s5: when the time reaches about 24h, the detection area industrial camera starts to shoot, the charging tray transported from the temporary storage area is shot for the second time in sequence, the upper computer performs image processing, the accuracy of the corresponding position dial plate during traveling is judged, and the unqualified dial plate is transferred to the secondary grade by the blanking mechanism.
S6: and the conveying line conveys the remaining material discs provided with the qualified dial plates to qualified positions for storage through a blanking mechanism.
1.2 measuring module for assembling parallelism of clock hands
The general scheme design of the high-precision clock pointer parallelism online automatic detection system based on machine vision for the clock pointer assembly parallelism measurement module is summarized as follows: firstly, a high-precision clock pointer parallelism online automatic detection system is arranged on a pointer assembly production station, after the pointer is assembled, the outline of the pointer is placed in a low-distortion fixed-focus lens view field, then a high-resolution industrial camera shoots a three-pointer real-time image, an analog-to-digital conversion is carried out to convert an analog image signal into a digital signal and the digital signal enters a computer through a serial port data line, a special image measurement software is utilized to process the collected image to realize a measurement function, finally a pass/fail/abnormal (represented by OK/NG/EX) result is output, and an operator carries out real-time trimming on the assembled clock pointer according to the measurement result on a software interface, thereby achieving the effect of real-time guidance assembly. The realization of the system function requires the mutual cooperation of software and hardware, and simultaneously selects the most appropriate software and hardware combination by considering the actual production condition, development time, measurement and identification requirements and expense limitation. The hardware of the system mainly comprises a Computer, a large constant water star camera, a Japanese Computer ten-million-pixel low-distortion fixed focus lens, a backlight high-brightness parallel surface light source, a serial port data line, a light source controller, a light source camera bracket and the like.
1.2.1 second hardware Module
Hardware portion referring to fig. 8, the second hardware module: the clock pointer image acquisition module is used for acquiring a clock pointer image and transmitting the clock pointer image to a computer through a data line; the method comprises the following steps: a CMOS industrial camera; a low distortion prime lens mounted on the CMOS industrial camera; and LED light sources with parallel surfaces on two sides of the lens are installed.
The camera is one of the key components in the machine vision inspection system. The resolution is one of the most important performance parameters of the camera, the resolution of the digital camera is directly dependent on the number of image elements on the target surface, and the digital camera is mainly used for measuring the resolution capability of the camera on bright and dark details in an object image, especially the description capability of image edge details, so that the accuracy of the system is directly influenced by the resolution of the camera. Setting the working distance with a view field of 40mm according to the size and the measurement precision of the measured dial; the resolution precision is 0.015mm, and a large constant water star series MER-1070-14U 3C/M camera is finally selected by calculating the system magnification, the resolution precision and the like, and the resolution of 1000 ten thousand pixels is used as terminal equipment for image acquisition. The camera is a USB3.0 interface CMOS industrial digital camera, adopts an Onsemi MT9J003 CMOS photosensitive chip, transmits image data through a USB3.0 data interface, integrates an I/O (GPIO) interface, provides a cable locking device, can stably work in various severe environments, and is an industrial digital camera product with high reliability and high cost performance. The method has the characteristics of high resolution, high definition, high precision, low noise and the like, supports self-defined AOI, reduces the resolution and can improve the frame rate; continuous acquisition, soft trigger acquisition and external trigger acquisition. Specific performance parameters are shown in table 1.
TABLE 1 MER-1070-14U3C/M Camera specific parameters
| Index name | Specific parameters |
| Resolution ratio | 3856(H)x 2764(V) |
| Frame rate | 14fps |
| Sensor type | 1/2.3”Rolling Shutter CMOS |
| Size of pixel | 1.67μm×1.67μm |
| Optical spectrum | Black and white |
| Image data format | Mono 8/Mono 10/Bayer RG 8/Bayer RG 10 |
| Data interface | Mini USB 3.0 |
| Power consumption | <2.5W@5V |
| Lens interface | C port |
| Mechanical dimensions | 29X 29mm without connecting pieces |
| Operating temperature | 0℃～+45℃ |
| Working humidity | 10％～80％ |
| Weight (D) | 58g |
According to the size and the measurement precision of the measured dial and the requirements of the selected large constant water star series MER-1070-14U3C/M camera, the comparison table of the fixed-focus lens is shown in Table 2, and finally, a Japanese Computer M2518-MPW2 lens and a 1000-million-pixel low-distortion fixed-focus lens (compact type) are selected.
TABLE 2 lens comparison table
The system selects a large-constant-water-star series MER-1070-14U3C/M camera with the target surface size of 1/2.3' (6.4mm multiplied by 4.6mm), the pixel number of 3856(H) multiplied by 2764(V), the pixel size of 1.67 mu M multiplied by 1.67 mu M, the magnification beta of the system is 4.6/40 which is 0.115mm, and the resolvable scene precision is as follows: the pixel size/magnification is 0.00167/0.115-0.0145 mm, and the requirement of 0.015mm of system resolution precision is met.
The light source is also one of important components in a machine vision detection system, and is mainly used for highlighting a detected target so that the detected target has better contrast with background information. In practical applications, it is generally required that a picture with good reproducibility is obtained for analysis, which requires stable and uniform illumination conditions for the target region. The system combines the characteristics of the tested parts, selects a backlight transmission type high-brightness parallel surface light source illumination mode, uniformly irradiates in a large area, has the light-emitting area of 60mm multiplied by 60mm and has the light-emitting color of white (color temperature: 6600 k-7000 k).
1.2.2 second image recognition processing Module
The second image recognition processing module is used for processing the acquired image, and extracting features and recognizing readings. The image processing and measuring software carries out program development through VC + + language, controls a camera to start to collect images, obtains real-time images and carries out binarization data processing to obtain three-needle parallelism values. The software architecture of FIG. 9 includes: the camera control submodule is: the camera is used for controlling initialization and starting of the camera; an image acquisition submodule: for a single acquisition of an image; an image preprocessing submodule: the image preprocessing module is used for preprocessing the acquired image; and a result output submodule: the data statistics storage submodule for outputting qualified, unqualified and abnormal measurement results is as follows: the method is used for counting the conditions of qualification, disqualification and abnormity of the pointer.
Referring to fig. 10, the system flow is as follows:
updating data, including updating experience data and setting parameters;
newly building a measurement project;
analyzing data and generating a report;
and data management, including uploading measurement data and uploading experience data.
2. An analysis module: the system comprises a data comprehensive analysis module and a data sorting and counting module;
3. the comprehensive management module comprises: the system comprises a user authority management module, a measurement data module, a measurement report generation management module and a data interaction management module.
4. The system adopts a TCP/IP protocol, the main mode of interaction between two communication processes is a client/server mode, namely, a subsystem sends a service request to a main platform server, and the server provides corresponding service after receiving the request. The process communication between networks in the mode is completely asynchronous, the processes which are communicated mutually do not have parent-child relationship, and a shared memory buffer area does not exist, and TCP/IP communication establishes contact between the communicated processes and provides synchronization for data exchange of a subsystem client and a server.
The control mode of the invention is controlled by manually starting and closing the switch, the wiring diagram of the power element and the supply of the power supply belong to the common knowledge in the field, and the invention is mainly used for protecting mechanical devices, so the control mode and the wiring arrangement are not explained in detail in the invention.
The control mode of the invention is automatically controlled by the controller, the control circuit of the controller can be realized by simple programming of a person skilled in the art, the supply of the power supply also belongs to the common knowledge in the field, and the invention is mainly used for protecting mechanical devices, so the control mode and the circuit connection are not explained in detail in the invention.
While there have been shown and described what are at present considered to be the basic principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A system for analyzing quality data of an assembly of a horological product, the system comprising:
a measurement module: the automatic detection module for the travel accuracy of the clock and the measuring module for the assembling parallelism of the clock pointer;
an analysis module: the system comprises a data comprehensive analysis module and a data sorting and counting module;
the comprehensive management module comprises: the system comprises a user authority management module, a measurement data module, a measurement report generation management module and a data interaction management module.
2. System for analyzing quality data of the assembly of a timepiece product according to claim 1,
the automatic detection module of the clock travel accuracy comprises:
a first hardware module: the device is used for collecting the clock pointer dial plate images and transmitting the clock pointer dial plate images to a computer through a data line;
the first image recognition processing module: the system is used for processing the acquired image, extracting features and identifying reading;
the material tray automatic transmission module: the automatic blanking and feeding device is used for automatic blanking and automatic feeding of clocks and watches and transmission of clocks and watches.
3. A horological product assembly quality data analysis system according to claim 2,
the first hardware module is specific to:
an industrial camera;
A lens mounted to the industrial camera;
LED light sources arranged at two sides of the lower part of the lens;
the industrial camera is a CCD camera;
the projection mode of the LED light source is that the LED light sources on two sides project laterally at the same angle.
4. A horological product assembly quality data analysis system according to claim 2,
the first image recognition processing module includes:
an image preprocessing module: useful characteristic information for removing noise influence on the clock image and highlighting the target image;
an image processing module: the device is used for performing image morphological operation, pointer straight line detection, dial scale line fitting and pointer rotation center fitting on a clock image;
dial plate reading identification module: for reading the dial reading.
5. A horological product assembly quality data analysis system according to claim 2,
the automatic material tray transmission module comprises a material loading area, a detection area, a temporary storage area and a sorting area.
6. System for analyzing quality data of the assembly of a timepiece product according to claim 5,
the automatic transportation method of the automatic tray transmission module comprises the following steps:
s1: manually feeding, wherein a material tray is transferred to a conveying line through a feeding mechanism and conveyed to a detection area;
S2: the industrial camera in the detection area takes a first photo of every 4 dials in the material tray at the same time;
s3: transferring the disk after being beaten to a stacking area of the temporary storage position;
s4: before the material tray is stored in the temporary storage position for 24 hours, the material tray is conveyed to a detection area to be detected;
s5: when the time reaches about 24 hours, starting to shoot by an industrial camera in the detection area, sequentially shooting the material trays for the second time, carrying out image processing by the upper computer, judging the time-lapse accuracy of the dial plate at the corresponding position, and transferring the unqualified dial plate to the secondary grade by the blanking mechanism;
s6: and (4) conveying the material discs of the qualified dial plates to qualified positions for storage through a blanking mechanism.
7. System for analyzing quality data of the assembly of a timepiece product according to claim 1,
the clock pointer assembly parallelism measuring module comprises:
a second hardware module: the clock pointer image acquisition device is used for acquiring clock pointer images and transmitting the clock pointer images to a computer through a data line;
the second image recognition processing module: the method is used for processing the acquired images, and extracting features and identifying readings.
8. System for analyzing quality data of the assembly of a timepiece product according to claim 7,
the second hardware module includes:
A CMOS industrial camera;
a low distortion prime lens mounted on the CMOS industrial camera;
and (4) installing LED light sources with parallel surfaces at two sides of the lens.
9. System for analyzing quality data of the assembly of a timepiece product according to claim 7,
the second image recognition processing module includes:
the camera control submodule is: the camera is used for controlling initialization and starting of the camera;
an image acquisition submodule: for a single acquisition of an image;
an image preprocessing submodule: the image preprocessing module is used for preprocessing the acquired image;
and a result output submodule: for outputting qualified, unqualified and abnormal measurement results
The data statistics storage submodule comprises: the method is used for counting the conditions of qualification, disqualification and abnormity of the pointer.
10. System for analyzing quality data of the assembly of a timepiece product according to claim 1,
the system flow is as follows:
updating data, including updating experience data and setting parameters;
newly building a measurement project;
analyzing data and generating a report;
and data management, including uploading measurement data and uploading experience data.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115082666A (en) * | 2022-08-23 | 2022-09-20 | 山东聊城中泰表业有限公司 | Watch time-travelling precision verification method based on image understanding |
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