CN117000558A - Coating dryer and control method thereof - Google Patents
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
- B05D3/0263—After-treatment with IR heaters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
- B05D3/0413—Heating with air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
- B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
- B05D3/065—After-treatment
- B05D3/067—Curing or cross-linking the coating
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- G—PHYSICS
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- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/40—Scenes; Scene-specific elements in video content
- G06V20/41—Higher-level, semantic clustering, classification or understanding of video scenes, e.g. detection, labelling or Markovian modelling of sport events or news items
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- G06V20/50—Context or environment of the image
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Abstract
The application discloses a coating dryer and a control method thereof, wherein the surface state monitoring video of a dried sheet acquired by a camera is acquired; performing feature extraction on the surface state monitoring video of the dried sheet to obtain a drying state context feature map; and determining a control strategy of the drying temperature based on the drying state context feature map. Like this, can adopt different stoving temperatures to carry out temperature control step by step to the sheet that waits to dry that is in different states to realize intelligent stoving step by step.
Description
Technical Field
The application relates to the technical field of intelligent dryers, in particular to a coating dryer and a control method thereof.
Background
At present, the working process of the sheet coating dryer is generally as follows: the method comprises the steps of firstly smearing a material with a specific function (such as glue, silicone oil or ink) on the surface of a sheet, then drying and heating the sheet, and finally rolling the dried product.
In the process of drying and heating the sheet after coating, workers are generally required to control the drying temperature of the sheet manually, the control precision is low, the waste of manpower and time is caused, and the production efficiency is greatly reduced. However, the heating area of the automatic sheet coating dryer is single, and the step-by-step drying of the sheet cannot be performed. If the sheets are to be dried step by step, a plurality of automatic sheet coating dryers are usually required to finish the process, so that the production cost is greatly increased.
Therefore, an optimized coating dryer and a control method thereof are desired.
Disclosure of Invention
The embodiment of the application provides a coating dryer and a control method thereof, wherein the surface state monitoring video of a dried sheet acquired by a camera is acquired; performing feature extraction on the surface state monitoring video of the dried sheet to obtain a drying state context feature map; and determining a control strategy of the drying temperature based on the drying state context feature map. Like this, can adopt different stoving temperatures to carry out temperature control step by step to the sheet that waits to dry that is in different states to realize intelligent stoving step by step.
The embodiment of the application also provides a control method of the coating dryer, which comprises the following steps:
acquiring a surface state monitoring video of a dried sheet acquired by a camera;
performing feature extraction on the surface state monitoring video of the dried sheet to obtain a drying state context feature map; and
and determining a control strategy of the drying temperature based on the drying state context characteristic diagram.
The embodiment of the application also provides a coating dryer which operates in the control method.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
fig. 1 is a flowchart of a control method of a coating dryer according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a system architecture of a control method of a coating dryer according to an embodiment of the present application.
Fig. 3 is a flowchart showing the substeps of step 120 in a control method of a coating dryer according to an embodiment of the present application.
Fig. 4 is a block diagram of a control system of a coating dryer according to an embodiment of the present application.
Fig. 5 is an application scenario diagram of a control method of a coating dryer according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings. The exemplary embodiments of the present application and their descriptions herein are for the purpose of explaining the present application, but are not to be construed as limiting the application.
Unless defined otherwise, all technical and scientific terms used in the embodiments of the application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present application.
In describing embodiments of the present application, unless otherwise indicated and limited thereto, the term "connected" should be construed broadly, for example, it may be an electrical connection, or may be a communication between two elements, or may be a direct connection, or may be an indirect connection via an intermediate medium, and it will be understood by those skilled in the art that the specific meaning of the term may be interpreted according to circumstances.
It should be noted that, the term "first\second\third" related to the embodiment of the present application is merely to distinguish similar objects, and does not represent a specific order for the objects, it is to be understood that "first\second\third" may interchange a specific order or sequence where allowed. It is to be understood that the "first\second\third" distinguishing objects may be interchanged where appropriate such that embodiments of the application described herein may be practiced in sequences other than those illustrated or described herein.
It should be understood that a sheet coating dryer is an apparatus for drying paint or coating applied to the surface of a sheet, and is generally used in the manufacturing industry for coating processes such as the production of paper, plastic films, metal foils, and the like.
The sheet coating dryer generally comprises a feeding device, a drying chamber, a hot air system, a discharging device, a control system and the like, wherein a sheet to be processed enters the drying chamber through the feeding device, is dried in the drying chamber through hot air provided by the hot air system, and is discharged through the discharging device.
The sheet coating dryer may employ different drying modes including hot air drying, infrared drying, ultraviolet drying, and the like. Hot air drying is the most common way to rapidly evaporate and cure the coating on the surface of the sheet by delivering heated air into the drying chamber.
Drying temperature and sheet running speed are two important control parameters in the drying process. Proper drying temperature and speed can ensure even distribution and full solidification of the coating on the surface of the sheet. The control system typically monitors the temperature and speed of the sheet and adjusts it according to the set parameters.
In order to ensure the drying effect and the product quality, the sheet coating dryer is generally equipped with a drying effect detection system. This may include on-line measurement of parameters such as moisture, thickness, coating uniformity, etc. on the sheet surface, and off-line inspection and testing of the dried sheet.
Sheet coating dryers are widely used in various industries, such as printing, packaging, electronics, construction materials, etc., for drying and curing coated papers, plastic films, metal foils, etc., to improve product quality and performance. It should be noted that the design and configuration of a particular sheet coating dryer may vary depending on the field of application and production requirements.
Further, control of the coating dryer is necessary, and stability, efficiency and product quality of the drying process can be ensured. The drying temperature is a key parameter influencing the curing and drying of the coating, and the curing and drying of the coating in a proper temperature range can be ensured by precisely controlling the temperature in the drying chamber, so that the quality and performance of the product are improved. Too high or too low a temperature may result in incomplete or excessive curing of the coating, affecting the appearance and performance of the product.
The running speed of the sheet is also a parameter to be controlled in the drying process, and the proper running speed can ensure the uniform distribution and full solidification of the coating on the surface of the sheet, and can also adjust the drying time and improve the production efficiency. The control method of the coating dryer can accurately control the running speed of the sheet according to the product requirement and the technological parameters.
In some cases, humidity in the drying chamber needs to be controlled in the drying process, and the control of the humidity can affect the volatilization speed and the curing effect of the coating. By controlling the humidity, the environmental conditions in the drying chamber can be adjusted to adapt to different coating and product requirements. The control of the drying time is also important to ensure the quality and production efficiency of the product, and by controlling the drying temperature, speed and other parameters, the drying time can be adjusted to achieve the desired degree of cure and drying of the coating in the appropriate time.
Safety factors such as overheat prevention, overload prevention and other abnormal conditions need to be considered in the coating and drying process, and the control method of the coating and drying machine can monitor and protect the running state of equipment, give an alarm in time or take measures to ensure the safety of the equipment and operators.
The stability, efficiency and product quality of the drying process can be ensured by controlling the coating dryer, uniform curing and drying of the coating can be realized by accurately controlling parameters such as temperature, speed, humidity, drying time and the like, the quality and performance of the product are improved, and meanwhile, the production efficiency and safety can also be improved.
In one embodiment of the present application, fig. 1 is a flowchart of a control method of a coating dryer provided in the embodiment of the present application. Fig. 2 is a schematic diagram of a system architecture of a control method of a coating dryer according to an embodiment of the present application. As shown in fig. 1 and 2, a control method 100 of a coating dryer according to an embodiment of the present application includes: 110, acquiring a surface state monitoring video of the dried sheet acquired by a camera; 120, extracting characteristics of the surface state monitoring video of the dried sheet to obtain a drying state context characteristic diagram; and, 130, determining a control strategy of the drying temperature based on the drying state context feature map.
Wherein, in the step 110, the position and angle of the camera are ensured to be capable of capturing the surface state of the dried sheet comprehensively, and the definition and image quality of the camera are ensured so as to accurately acquire the surface state information. The surface state of the sheet is monitored in real time, and abnormal conditions such as uneven coating, bubbles, wrinkling and the like can be found in time. And a real-time data source is provided, so that a foundation is provided for the subsequent feature extraction and drying temperature control strategy.
In the step 120, a suitable feature extraction algorithm is selected to extract key features reflecting the surface state of the sheet, and further, methods using computer vision and image processing techniques such as edge detection, color analysis, texture feature extraction, etc. are contemplated. Wherein the extracted features can reflect the state changes of the sheet surface, such as coating thickness, coating uniformity, surface flatness, etc. The context feature map of the drying state after the feature extraction can provide more visual and interpretable information, and provides basis for a subsequent drying temperature control strategy.
In the step 130, a suitable model or algorithm is built, and a control strategy of the drying temperature is determined according to the drying state context feature map and the target drying effect. Also, it is considered to optimize the adjustment of the drying temperature using a machine learning, fuzzy control, PID control, etc. According to the context characteristic diagram of the drying state and the control strategy, the drying temperature can be automatically adjusted to adapt to the change of the surface state of the sheet. The intelligent step-by-step drying can be realized, the drying effect and the product quality are improved, and the energy consumption and the production cost are reduced.
In the above steps, the control method of the coating dryer includes acquiring a surface state monitoring video, feature extraction and a drying temperature control strategy. Through the steps, the surface state of the sheet can be monitored in real time, key features are extracted, and the drying temperature is adjusted according to the features, so that the drying effect and the product quality are improved.
Specifically, in the step 110, a surface state monitoring video of the dried sheet acquired by the camera is acquired. Aiming at the technical problems, the technical concept of the application is to adaptively adjust the drying temperature based on the surface state of the sheet to be dried so as to realize intelligent step-by-step drying. That is, the temperature control step by step is performed to the sheet to be dried in different states by adopting different drying temperatures, so as to realize intelligent step by step drying.
Based on the above, in the technical scheme of the application, firstly, the surface state monitoring video of the dried sheet acquired by the camera is acquired. The surface state information of the dried sheet can be obtained in real time through the monitoring video, and the information can be used for detecting the uniformity, the dryness and other possible problems of the coating. Based on the real-time feedback information, a control strategy of the drying temperature can be timely adjusted to meet target requirements.
The drying temperature is a key parameter affecting the curing and drying of the coating, and the actual condition of the coating, such as the thickness of the coating, the uniformity of the coating and the like, can be known through monitoring videos. Based on this information, the drying temperature can be dynamically adjusted to ensure that the coating cures and dries at a suitable temperature, thereby improving the quality and performance of the product.
The monitoring video can help to detect abnormal conditions in the coating drying process, such as uneven coating, bubbles, wrinkling and the like, and corresponding measures can be timely taken through monitoring and analysis of the abnormal conditions, such as adjusting the drying temperature, increasing the drying time and the like, so as to avoid the reduction of the coating quality. By analyzing the monitoring video, a large amount of data such as the thickness distribution of the coating, the drying speed and the like can be obtained, and the data can be used for further data analysis and optimization so as to improve the control strategy of the drying temperature and improve the efficiency of the drying process and the quality of products.
That is, the acquisition of the surface state monitoring video of the sheet material to be dried, which is acquired by the camera, plays a role in real-time monitoring, dynamic adjustment, anomaly detection, data analysis and other aspects on the control strategy for finally determining the drying temperature, and is beneficial to improving the stability, efficiency and product quality of the drying process.
Specifically, in the step 120, feature extraction is performed on the surface state monitoring video of the dried sheet to obtain a drying state context feature map. Fig. 3 is a flowchart of the substeps of step 120 in the control method of a coating dryer according to the embodiment of the present application, as shown in fig. 3, the feature extraction is performed on the surface state monitoring video of the dried sheet to obtain a drying state context feature map, including: 121, performing video preprocessing on the surface state monitoring video of the dried sheet to obtain a plurality of thinned drying state monitoring video segments; and 122, performing time sequence analysis and association mode extraction on the plurality of thinned drying state monitoring video clips to obtain the drying state context feature map.
According to the application, by preprocessing the monitoring video, noise and smooth images can be removed, and key drying state information can be extracted, so that the accuracy and reliability of subsequent feature extraction can be improved. The monitoring video is segmented into a plurality of segments, and drying state information in different time periods can be extracted, so that the change and evolution process of the surface state of the sheet can be better captured, and more useful information is provided for subsequent analysis. By carrying out time sequence analysis and correlation pattern extraction on a plurality of drying state monitoring video clips, the correlation and regularity between different time points can be found, the change trend of the sheet surface state can be understood, and the characteristics related to the drying effect can be extracted. By integrating the results of the timing analysis and the correlation pattern extraction, a drying state context feature map can be obtained, which can provide global knowledge of sheet surface state, helping to determine a control strategy for drying temperature.
For said step 121, it comprises: video segmentation is carried out on the surface state monitoring video of the dried sheet so as to obtain a plurality of drying state monitoring video segments; and performing sparse sampling on the plurality of drying state monitoring video segments to obtain the plurality of sparse drying state monitoring video segments.
And then, carrying out video preprocessing on the surface state monitoring video of the dried sheet to obtain a plurality of thinned drying state monitoring video fragments. Here, considering that the surface state monitoring video of the sheet to be dried contains a large amount of data, it is possible to select to ignore or remove for some similar frames and repeated frames. That is, the surface state monitoring video of the dried sheet is split into a plurality of thinned drying state monitoring video segments, so that the operation efficiency of the subsequent model is improved.
In a specific example of the present application, the encoding process for performing video preprocessing on the surface state monitoring video of the dried sheet to obtain a plurality of thinned drying state monitoring video segments includes: firstly, carrying out video segmentation on the surface state monitoring video of the dried sheet to obtain a plurality of drying state monitoring video segments; and performing sparse sampling on the plurality of drying state monitoring video segments to obtain a plurality of sparse drying state monitoring video segments.
Specifically, in one embodiment of the present application, firstly, preprocessing is performed on the acquired video, including denoising, smoothing, brightness contrast adjustment, and the like, so as to improve the accuracy and reliability of subsequent processing. The video is then broken down into a series of successive frame images, the frame rate can be set as desired, for example 10 frames per second are extracted. The successive frame images are then divided into a plurality of segments according to time intervals or other dividing criteria, which may be divided according to specific drying processes and needs. For example, each clip contains 5 seconds of video. Finally, each segment obtained by division is stored as an independent video file for subsequent processing and analysis.
Through the steps, the surface state monitoring video of the dried sheet can be segmented into a plurality of drying state monitoring video segments, and basic data is provided for subsequent time sequence analysis and association mode extraction. Thus, the state change in the drying process can be better captured, and the characteristics related to the drying effect can be extracted.
Further, the sparse sampling is a method for selectively sampling data points in time series data to reduce data volume and retain key information, and in the drying state monitoring video, the sparse sampling can be used for selectively extracting key frames or time points to obtain a sparse drying state monitoring video segment representing the whole video.
The plurality of drying state monitoring video clips can be sparsely sampled in a periodic sampling manner. The sampling points are selected at regular time intervals, for example, one frame or time point is selected at regular time intervals as the sampling point.
The plurality of drying state monitoring video clips can be sparsely sampled in a random sampling manner. The sampling points are randomly selected to ensure randomness and representativeness of the data, and this approach can avoid excessive attention to a specific time period.
The plurality of drying state monitoring video clips may be sparsely sampled in a feature-based sampling manner. The sampling is performed according to characteristics of the video frames, and representative frames are selected, for example, the sampling frames may be selected according to image quality, motion information, or other specific characteristics.
The plurality of drying state monitoring video clips can also be sparsely sampled in an event-based sampling manner. Sampling is performed according to a specific event occurring during the drying process, for example, when a temperature change exceeds a threshold value or an abnormal condition occurs, a sampling frame is selected.
By sparse sampling, a small amount of sparse drying state monitoring video fragments can be extracted from the original drying state monitoring video, and the fragments can represent key information of the whole video, so that the burden of storage and processing is reduced, and the method plays a role in subsequent feature extraction and drying temperature control.
For said step 122, it comprises: the plurality of sparse drying state monitoring video segments respectively pass through a drying state time sequence feature extractor based on a three-dimensional convolutional neural network model to obtain a plurality of drying state time sequence feature diagrams; and the plurality of drying state time sequence characteristic diagrams are processed by a drying state full time sequence associated encoder based on a converter model to obtain the drying state context characteristic diagram.
And then, carrying out time sequence analysis and correlation pattern extraction on the plurality of thinned drying state monitoring video segments to obtain the drying state context feature map. That is, the high-dimensional implicit drying state information in each thinned drying state monitoring video clip is captured through time sequence analysis, and the time sequence association relationship between each clip is captured by using association pattern extraction.
In a specific example of the present application, the encoding process for performing time sequence analysis and correlation pattern extraction on the plurality of thinned drying state monitoring video clips to obtain the drying state context feature map includes: firstly, enabling the plurality of sparse drying state monitoring video fragments to respectively pass through a drying state time sequence feature extractor based on a three-dimensional convolutional neural network model to obtain a plurality of drying state time sequence feature diagrams; subsequently, the plurality of drying state time sequence characteristic diagrams are passed through a drying state full time sequence correlation encoder based on a converter model to obtain a drying state context characteristic diagram.
The drying state time sequence feature extractor is used for processing the plurality of thinned drying state monitoring video fragments and can be used for extracting a drying state time sequence feature diagram. The feature maps can capture key information and change trends in the video, such as temperature distribution, humidity change and the like.
Then, these drying state time sequence feature diagrams are processed by a drying state full time sequence associated encoder based on a converter model, so that a drying state context feature diagram can be obtained. The drying state context feature map is an integral code of a plurality of drying state time sequence feature maps, and contains context information and relevance in the whole drying process.
By the method, the drying state context feature diagrams can be extracted from a plurality of sparse drying state monitoring video clips, and the feature diagrams can be used for a subsequent drying temperature control strategy. By utilizing the context characteristic diagram of the drying state, the state change and trend in the drying process can be judged more accurately, so that the drying temperature is regulated to improve the drying effect and the product quality. The method is beneficial to realizing real-time monitoring and control of the drying process and improving the production efficiency and the product consistency.
Specifically, in the step 130, a control strategy of the drying temperature is determined based on the drying state context feature map, including: performing feature distribution optimization on the drying state context feature map to obtain an optimized drying state context feature map; and passing the optimized drying state context feature map through a classifier to obtain a classification result, wherein the classification result is used for representing increasing drying temperature or decreasing drying temperature, and the classification result is used as the control strategy.
In the technical scheme of the application, after the plurality of drying state monitoring video segments are sparsely sampled, feature extraction is performed through the drying state time sequence feature extractor based on the three-dimensional convolutional neural network model, and although the calculated amount can be reduced by reducing the image source semantics, the difference between the image semantic feature distribution among the feature matrixes of the plurality of drying state time sequence feature graphs can be improved due to the reduction of the transition source semantics before the image frames in the video. Although the full-time-series correlation encoder of the drying state based on the converter model can extract the feature context correlation among the plurality of time-series feature diagrams of the drying state, the explicit difference among feature distributions among the feature matrices of the context feature diagrams of the drying state still exists, so that manifold geometric differences of feature manifold expressions of the feature matrices are represented in a high-dimensional feature space, which can cause poor manifold geometric continuity of the context feature diagrams of the drying state, thereby affecting the accuracy of classification results obtained by the classifier.
The applicant of the present application therefore refers to each feature matrix along the channel dimension of the drying-state context feature map, for example denoted M i Performing channel dimension traversal flow form convex optimization of the feature map, wherein the channel dimension traversal flow form convex optimization is expressed as follows: performing channel dimension traversal flow form convex optimization of the feature map on each feature matrix of the drying state context feature map along the channel dimension by using the following optimization formula; wherein, the optimization formula is:
wherein V is t1 [GAP(F)]And V t2 [GAP(F)]Column vectors and row vectors which are respectively obtained by linear transformation based on global average pooling vectors of feature matrixes of the drying state context feature graphs 2 Representing the spectral norms of the matrix, M i Each feature matrix along the channel dimension of the drying-state context feature map, F the drying-state context feature map, M' i For each feature matrix of the optimized drying state context feature map,represents a matrix multiplication, and by-represents a dot multiplication by location
Here, the channel dimension traversal manifold optimization of the dry state context feature map determines the base dimension of the feature matrix manifold by structuring the maximum distribution density direction of the modulated feature matrices, and traverses the feature matrix manifold along the channel direction of the dry state context feature map to constrain each feature matrix M by stacking the base dimension of the traversal manifold along the channel direction i Convex optimization of continuity of represented traversal manifold, thereby realizing a feature matrix M 'after optimization' i The geometric continuity of the high-dimensional characteristic manifold of the drying state context characteristic diagram formed by the traversing manifold is improved, so that the accuracy of a classification result obtained by the classifier is improved.
Further, the optimized drying state context feature map is passed through a classifier to obtain a classification result, wherein the classification result is used for representing increasing the drying temperature or decreasing the drying temperature.
In summary, a control method 100 of a coating dryer according to an embodiment of the present application is illustrated, which adaptively adjusts a drying temperature based on a surface state of a sheet to be dried to achieve intelligent stage-by-stage drying. That is, the temperature control step by step is performed to the sheet to be dried in different states by adopting different drying temperatures, so as to realize intelligent step by step drying.
In one embodiment of the application, a coating dryer is provided that operates in a control method as described
Fig. 4 is a block diagram of a control system of a coating dryer according to an embodiment of the present application. As shown in fig. 4, the control system of the coating dryer includes: the video acquisition module 210 is used for acquiring a surface state monitoring video of the dried sheet acquired by the camera; the feature extraction module 220 is configured to perform feature extraction on the surface state monitoring video of the dried sheet to obtain a drying state context feature map; and a drying temperature control module 230 for determining a control strategy of the drying temperature based on the drying state context feature map.
It will be appreciated by those skilled in the art that the specific operation of the respective steps in the control system of the above-described coating dryer has been described in detail in the above description of the control method of the coating dryer with reference to fig. 1 to 3, and thus, repetitive description thereof will be omitted.
In a specific embodiment of the application, the manual automatic temperature control system of the sheet coating dryer in the embodiment comprises a temperature controller, an exhaust motor, an exhaust relay, an exhaust alternating-current contactor, an air inlet motor, an air inlet relay, an air inlet alternating-current contactor, an intermediate relay, a main solid-state relay, a change-over switch, a thermocouple probe, a main heating device, two auxiliary intermediate relays, two auxiliary solid-state relays and two auxiliary heating devices, wherein the change-over switch is provided with an automatic control gear and two manual control gears, and the auxiliary intermediate relays, the auxiliary solid-state relays and the auxiliary heating devices are the same in number and correspond to the manual control gears one by one; the two manual control gears are a first manual control gear and a second manual control gear respectively; the two auxiliary intermediate relays are respectively an auxiliary intermediate relay and an auxiliary intermediate relay, the two auxiliary solid-state relays are respectively an auxiliary solid-state relay and an auxiliary solid-state relay, and the two auxiliary heating devices are respectively a first auxiliary heating device and a second auxiliary heating device. The main heating device is provided with an executing mechanism, the first auxiliary heating device is provided with an executing mechanism, and the second auxiliary heating device is provided with an executing mechanism;
one end of a coil of the air draft relay is connected with the positive electrode of the power supply through an automatic control gear of the change-over switch, and the other end of the coil of the air draft relay is connected with a zero line; one end of a coil of the air draft alternating current contactor is connected with the positive electrode of the power supply through a normally open contact of the air draft relay, and the other end of the coil of the air draft alternating current contactor is connected with a zero line;
the exhaust motor is connected between the positive electrode and the negative electrode of the strong current through a normally open contact of the exhaust alternating current contactor;
one end of a coil of the air inlet relay is connected between the air suction motor and a normally open contact of the air suction alternating current contactor through a connecting wire, and the other end of the coil of the air inlet relay is connected with a zero line; one end of a coil of the air inlet alternating current contactor is connected with the positive electrode of the power supply through a normally open contact of the air inlet relay and an automatic control gear of the change-over switch, and the other end of the coil of the air inlet alternating current contactor is connected with a zero line;
the air inlet motor is connected between the positive electrode and the negative electrode of the strong current through a first normally open contact of the air inlet alternating current contactor;
one end of a coil of the intermediate relay is connected between the air inlet motor and a first normally open contact of the air inlet alternating current contactor through a connecting wire, and the other end of the coil of the intermediate relay is connected with a zero line;
the second normally open contact of the air inlet alternating current contactor is connected between the power input end and the power anode of the temperature controller, and the current output end of the temperature controller is connected with a zero line; the thermocouple probe is connected with a corresponding wiring terminal of the temperature controller, and a corresponding wire outlet terminal of the temperature controller is connected with an actuating mechanism of the main heating device through a first normally open contact of the intermediate relay; the actuating mechanism of the main heating device is connected between the positive electrode and the negative electrode of the strong current through a main solid relay;
the automatic control gear of the change-over switch is connected with the manual control gear of the change-over switch through the second normally open contact of the intermediate relay. When the first manual control gear is started, one end of a coil of the auxiliary intermediate relay is connected with the first manual control gear, and the other end of the coil of the auxiliary intermediate relay is connected with a zero line; the auxiliary solid-state relay is connected between the positive electrode and the negative electrode of the strong electricity through an actuating mechanism of the first auxiliary heating device; the actuating mechanism of the first auxiliary heating device is connected between the positive electrode and the negative electrode of the strong electricity through the normally open contact of the auxiliary intermediate relay.
When the second manual control gear is started, one end of a coil of the auxiliary intermediate relay is connected with the second manual control gear, and the other end of the coil of the auxiliary intermediate relay is connected with a zero line; the auxiliary solid-state relay is connected between the positive electrode and the negative electrode of the strong electricity through an actuating mechanism of the second auxiliary heating device; the actuating mechanism of the second auxiliary heating device is connected between the positive electrode and the negative electrode of the strong electricity through the normally open contact of the auxiliary intermediate relay.
The exhaust motor and the air intake motor generally adopt centrifugal fans.
The actuator of the main heating device is typically a contactor or trigger.
The actuator of the auxiliary heating apparatus is typically a contactor or trigger.
The main solid-state relay comprises a first main solid-state relay and a second main solid-state relay, the first main solid-state relay and the second main solid-state relay are connected in parallel between the positive electrode and the negative electrode of the strong electricity, and an actuating mechanism of the main heating device is connected with the second main solid-state relay. For long-term electricity safety, the current passing through the main solid state relay is split, and the current is respectively transmitted to the first main solid state relay and the second main solid state relay.
The manual automatic temperature control system of the sheet coating dryer further comprises an alarm intermediate relay, wherein one end of a coil of the alarm intermediate relay is connected with a corresponding outgoing line end of the temperature controller, and the other end of the coil of the alarm intermediate relay is connected with a zero line; the normally closed contact of the alarm intermediate relay is connected in series between the manual control gear and the second normally open contact of the intermediate relay. When the change-over switch is still in the manual control gear, the real-time temperature value measured by the thermocouple probe is larger than the preset temperature value, the temperature controller sends an alarm signal, the coil of the alarm intermediate relay is powered on, the normally closed contact of the alarm intermediate relay is disconnected, the auxiliary heating device is powered off, and manual heating of the sheet is stopped.
The manual automatic temperature control system of the sheet coating dryer further comprises an exhaust thermal relay, wherein a heating element of the exhaust thermal relay is connected between a normally open contact of an exhaust alternating-current contactor and an input end of an exhaust motor in series, and a normally closed contact of the exhaust thermal relay is connected between a coil of the exhaust alternating-current contactor and a zero line in series. The heating element of the exhaust thermal relay is a section of resistance wire with small resistance value, and is connected in series in the control circuit of the exhaust motor. When the exhaust motor is overloaded, the current passing through the heating element exceeds the setting current, so that the normally closed contact of the exhaust thermal relay is disconnected. Because the normally closed contact of the exhaust thermal relay is connected in the control circuit of the exhaust motor, the disconnection of the normally closed contact of the exhaust thermal relay can lead the coil of the exhaust alternating current contactor connected with the normally closed contact to be disconnected, thereby disconnecting the contact of the exhaust alternating current contactor and the control circuit of the exhaust motor to be disconnected, and realizing the overload protection of the exhaust motor.
The normally open contact input end of the air draft alternating current contactor is also connected with a miniature circuit breaker of a three-phase alternating current power supply. The miniature circuit breaker is mainly used for overload and short-circuit protection of circuits and electrical equipment.
The manual automatic temperature control system of the sheet coating dryer further comprises an air intake thermal relay, wherein a heating element of the air intake thermal relay is connected between the output end of a normally open contact of an air intake alternating-current contactor and the input end of an air intake motor in series, and a normally closed contact of the air intake thermal relay is connected between a coil of the air intake alternating-current contactor and a zero line in series. The heating element of the air intake thermal relay is a section of resistance wire with small resistance value, and is connected in series in the control circuit of the air intake motor. When the air intake motor is overloaded, the current passing through the heating element exceeds the setting current, so that the normally closed contact of the air intake thermal relay is disconnected. Because the normally closed contact of the air intake thermal relay is connected in the control circuit of the air intake motor, the disconnection of the normally closed contact of the air intake thermal relay can lead the coil of the air intake alternating current contactor connected with the normally closed contact to be disconnected, thereby disconnecting the contact of the air intake alternating current contactor, and the control circuit of the air intake motor is disconnected, thus realizing overload protection of the air intake motor.
The normally open contact input end of the air inlet alternating current contactor is also connected with a miniature circuit breaker of a three-phase alternating current power supply. The miniature circuit breaker is mainly used for overload and short-circuit protection of circuits and electrical equipment.
The normally open contact input end of the exhaust relay is connected with a fuse. The fuse is a current protector which melts a melt by heat generated by itself after a current exceeds a prescribed value for a certain period of time, thereby opening a circuit. The fuse has simple structure and convenient use, and is widely used as a protection device in power systems, various electrical equipment and household appliances.
When the air exhausting relay works, a power supply is firstly connected, a preset temperature value is set on the temperature controller, then an automatic control gear of the change-over switch is opened, and a coil of the air exhausting relay is electrified, so that a normally open contact of the air exhausting relay is closed; the coil of the air draft alternating current contactor is electrified, the normally open contact of the air draft alternating current contactor is closed, and the circuit of the air draft motor is electrified to work; when the normally open contact of the air draft alternating current contactor is closed, the coil of the air inlet relay is electrified through the connecting wire, the normally open contact of the air inlet relay is closed, and the circuit of the air inlet motor is electrified to work; when the normally open contact of the air inlet relay is closed, the coil of the air inlet alternating current contactor is electrified, the first normally open contact of the air inlet alternating current contactor is closed, the coil of the intermediate relay is electrified through a connecting wire, the first normally open contact of the intermediate relay is closed, meanwhile, the second normally open contact of the air inlet alternating current contactor is closed, the temperature controller is electrified to start working, the real-time temperature value is fed back to the temperature controller through the thermocouple probe, the temperature controller compares the real-time temperature value with a preset temperature value, when the real-time temperature value is smaller than the preset temperature value, the temperature controller outputs an automatic heating signal, and because the first normally open contact of the intermediate relay is closed, the main solid state relay is electrified to work, and at the moment, the actuating mechanism of the main heating device is closed through the first normally open contact of the intermediate relay to automatically heat the sheet.
In addition, when the change-over switch is still in automatic control gear, the real-time temperature value measured by the thermocouple probe is greater than the preset temperature value, at the moment, the first normally open contact of the intermediate relay is disconnected, the main solid relay is powered off to stop working, and the main heating device stops automatically heating the sheet.
When the automatic heating temperature of the main heating device does not reach the drying temperature required by the sheet, the manual control gear of the change-over switch is manually opened, the coil of the intermediate relay is powered on, the second normally open contact of the intermediate relay is closed, the coil of the auxiliary intermediate relay is powered on, the normally open contact of the auxiliary intermediate relay is closed, the actuating mechanism of the auxiliary heating device enables the auxiliary solid state relay to be powered on, and at the moment, on the basis that the main heating device automatically heats the sheet, the auxiliary heating device is utilized to further manually heat the sheet.
In this embodiment, when the automatic control gear of the change-over switch is turned on, the change-over switch is switched to the main heating device, and at this time, the contact of the change-over switch is closed, and at this time, the power of the first main solid state relay is 7.2KW, the power of the second main solid state relay is 7.2KW, and the total power of the main heating device is 7.2kw+7.2kw=14.4 KW.
When the first manual control gear of the change-over switch is opened, the first auxiliary heating device is switched to, at the moment, the contacts of the change-over switch are closed, the main heating device and the first auxiliary heating device heat simultaneously, at the moment, the power of the auxiliary solid state relay is 7.2KW, and the total power of the main heating device and the first auxiliary heating device is 14.4 KW+7.2KW=21.6 KW.
If the drying temperature of the sheet material is slow or the temperature upper limit is not reached, the second manual control gear of the change-over switch can be opened again, the change-over switch is switched to the second auxiliary heating device, at the moment, contacts of the change-over switch are all closed, the main heating device, the first auxiliary heating device and the second auxiliary heating device are used for heating simultaneously, at the moment, the power of the auxiliary solid state relay is 3.6KW, and the total power of the main heating device, the first auxiliary heating device and the second auxiliary heating device is 14.4KW+7.2KW+3.6KW=25.2 KW.
According to the automatic temperature control system of the sheet coating dryer hand, according to the drying requirement of a sheet, the air suction motor is enabled to work by switching on a power supply through gear control of a transfer switch, the air suction motor works after the air suction loop detects operation, the action feedback is switched on a temperature controller, the temperature controller sends an automatic heating signal to an intermediate relay of a main heating device, and an actuating mechanism (contactor) of the main heating device is enabled to be switched on to heat by the power supply, so that under the premise of ensuring that the air suction motor and the air suction motor start to work, the air suction motor, the air suction alternating current contactor, the air suction relay, the air suction alternating current contactor and the intermediate relay are sequentially triggered step by step, the automatic control of the drying temperature of the sheet is realized, and if heating is required, at least one auxiliary heating device can be manually connected. The manual automatic temperature control system of the sheet coating dryer not only has a main heating device for automatically controlling heating, but also has at least one auxiliary heating device for manually controlling heating, so that the drying temperature of the sheet can be controlled step by step, the temperature of the sheet coating dryer can be automatically and manually controlled, the labor and time are saved, the production cost is reduced, and the production efficiency is improved.
As described above, the control system 100 of a coating dryer according to an embodiment of the present application may be implemented in various terminal devices, such as a server or the like for control of the coating dryer. In one example, the control system 100 of the coating dryer according to an embodiment of the present application may be integrated into the terminal device as one software module and/or hardware module. For example, the control system 100 of the coating dryer may be a software module in the operating system of the terminal device, or may be an application developed for the terminal device; of course, the control system 100 of the coating dryer can equally be one of the numerous hardware modules of the terminal device.
Alternatively, in another example, the control system 100 of the coating dryer and the terminal device may be separate devices, and the control system 100 of the coating dryer may be connected to the terminal device through a wired and/or wireless network and transmit the interactive information in a agreed data format.
Fig. 5 is an application scenario diagram of a control method of a coating dryer according to an embodiment of the present application. As shown in fig. 5, in this application scenario, first, a surface state monitoring video (e.g., C as illustrated in fig. 5) of a sheet to be dried (e.g., M as illustrated in fig. 5) acquired by a camera is acquired; the acquired surface state monitoring video is then input into a server (e.g., S as illustrated in fig. 5) deployed with a control algorithm of the coating dryer, wherein the server is capable of processing the surface state monitoring video based on the control algorithm of the coating dryer to determine a control strategy of the drying temperature.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the application, and is not meant to limit the scope of the application, but to limit the application to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the application are intended to be included within the scope of the application.
Claims (7)
1. A control method of a coating dryer, comprising:
acquiring a surface state monitoring video of a dried sheet acquired by a camera;
performing feature extraction on the surface state monitoring video of the dried sheet to obtain a drying state context feature map; and
and determining a control strategy of the drying temperature based on the drying state context characteristic diagram.
2. The method of claim 1, wherein the feature extraction of the surface state monitoring video of the dried sheet to obtain a drying state context feature map comprises:
performing video preprocessing on the surface state monitoring video of the dried sheet to obtain a plurality of thinned drying state monitoring video segments; and
and carrying out time sequence analysis and correlation pattern extraction on the plurality of thinned drying state monitoring video segments to obtain the drying state context feature map.
3. The control method of a coating dryer according to claim 2, characterized in that video preprocessing is performed on the surface state monitoring video of the sheet to be dried to obtain a plurality of thinned drying state monitoring video pieces, comprising:
video segmentation is carried out on the surface state monitoring video of the dried sheet so as to obtain a plurality of drying state monitoring video segments; and
and sparsely sampling the plurality of drying state monitoring video segments to obtain the plurality of sparsely drying state monitoring video segments.
4. The control method of a coating dryer according to claim 3, wherein performing timing analysis and correlation pattern extraction on the plurality of thinned drying state monitoring video clips to obtain the drying state context feature map includes:
the plurality of sparse drying state monitoring video segments respectively pass through a drying state time sequence feature extractor based on a three-dimensional convolutional neural network model to obtain a plurality of drying state time sequence feature diagrams; and
and the plurality of drying state time sequence characteristic diagrams are processed by a drying state full time sequence associated encoder based on a converter model to obtain the drying state context characteristic diagrams.
5. The control method of a coating dryer according to claim 4, wherein determining a control strategy of a drying temperature based on the drying state context feature map includes:
performing feature distribution optimization on the drying state context feature map to obtain an optimized drying state context feature map; and
and the optimized drying state context feature map is passed through a classifier to obtain a classification result, wherein the classification result is used for representing increasing drying temperature or decreasing drying temperature, and the classification result is used as the control strategy.
6. The method of claim 5, wherein optimizing the profile distribution of the drying-state context profile to obtain an optimized drying-state context profile comprises:
performing channel dimension traversal flow form convex optimization of the feature map on each feature matrix of the drying state context feature map along the channel dimension by using the following optimization formula;
wherein, the optimization formula is:
wherein V is t1 [GAP(F)]And V t2 [GAP(F)]Column vectors and row vectors which are respectively obtained by linear transformation based on global average pooling vectors of feature matrixes of the drying state context feature graphs 2 Representing the spectral norms of the matrix, M i Each feature matrix along the channel dimension of the drying-state context feature map, F the drying-state context feature map, M' i For each feature matrix of the optimized drying state context feature map,represents a matrix multiplication, and by position points.
7. A coating dryer, characterized in that it operates in a control method according to claims 1 to 6.
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| CN117331339A (en) * | 2023-12-01 | 2024-01-02 | 南京华视智能科技股份有限公司 | Coating machine die head motor control method and device based on time sequence neural network model |
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| CN117331339A (en) * | 2023-12-01 | 2024-01-02 | 南京华视智能科技股份有限公司 | Coating machine die head motor control method and device based on time sequence neural network model |
| CN117331339B (en) * | 2023-12-01 | 2024-02-06 | 南京华视智能科技股份有限公司 | Coating machine die head motor control method and device based on time sequence neural network model |
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