Carbon paper production method and system

Abstract

The invention belongs to the field of industrial production of films such as carbon paper, particularly relates to a carbon paper production method and system, and solves the problems of large-scale, low-cost and low-energy-consumption automatic production of carbon paper for fuel cells. The production method comprises the following steps: setting a production line consisting of a carbon paper drying unit, a carbon paper flattening unit, a first carbon paper heat treatment unit, a load coating unit, a second carbon paper heat treatment unit, a visual screening unit, an index detection unit and a product packaging unit which are sequentially connected according to production procedures, and a data processing unit, each unit collects production data of each piece of carbon paper and sends the production data to the data processing unit. According to the production method, an intermittent production mode is changed, and accurate and quick response of production and quality control is facilitated.

Description

Technical Field

[0001] The invention belongs to the field of industrialized production of films such as carbon paper, and is particularly suitable for large-scale and automated production of carbon paper, and particularly relates to a carbon paper production method and system. Background Art

[0002] Proton exchange membrane fuel cells (PEMFCs) are considered to be the preferred clean, energy-efficient power generation device due to their high power density, high energy conversion efficiency, fast low-temperature start-up, no pollution, and long battery life. It can be widely used in transportation fields such as new energy vehicles, armored vehicles, heavy trucks, and buses, and has great application prospects. In fuel cells, membrane electrode assemblies (MEA) are core components, which not only have high raw material costs, but also high requirements for preparation processes. The membrane electrode assembly is a composite assembly formed by composite catalyst layers and gas diffusion layers on both sides with proton exchange membranes as the center of the sandwich. The gas diffusion layer of the fuel cell is a key component that affects the performance of the battery. It plays the role of supporting the catalyst layer and stabilizing the electrode structure in the electrode. It also has multiple functions such as providing gas channels, electron channels, and drainage channels for electrode reactions.

[0003] The main carbon materials used to prepare the gas diffusion layer include carbon fiber paper, carbon fiber cloth, carbon fiber felt, etc. The main technical route currently used is mainly to compound carbon fiber, polyadhesive, etc., and then further vacuum dry, level, high temperature carbonization and other complex processing processes to obtain carbon fiber paper. Although there is also a method of dispersing carbon fiber in pulping, drying for manual papermaking, and obtaining a carbon paper blank, the carbon paper blank still needs to be subjected to multiple processing procedures such as secondary coating, vacuum drying, leveling, heat treatment (including high temperature carbonization). Since carbon paper itself has the characteristics of brittleness, it is easy to bend and break in actual production, so many processes must be completed manually, which makes it difficult to achieve automation and continuous production. For example, most of the processes such as carbon paper graphitization can only use intermittent processes, which greatly limits the large-scale production of carbon fiber paper, and the cost is high and the energy consumption is large.

[0004] On the one hand, if there is a problem in any link, it needs to be handled manually, which is time-consuming and labor-intensive, inefficient, and invisibly increases the labor cost, which is not conducive to the low cost of carbon paper production. On the other hand, it is difficult to quickly trace the problems that occur in the preparation and processing of carbon paper to specific process links, such as quickly troubleshooting the cause of the problem in actual production, quickly checking equipment failures, manual misoperation, and process tracking and quality control review. Summary of the invention

[0005] In view of the above analysis, the present invention aims to provide a carbon paper production method and system, which utilizes automated production technology to control the existing manual production process of carbon paper step by step according to the process flow, and simultaneously utilizes digital twin technology to replicate the physical production process in digital space. The production process is optimized by real-time recording of data fluctuations generated during the production debugging process, so as to realize large-scale, low-cost, and low-energy automated production of carbon paper for fuel cells, and facilitate accurate and rapid response of production and quality control.

[0006] The purpose of the present invention is mainly achieved through the following technical solutions:

[0007] The present invention provides a carbon paper production method, comprising a production line including a carbon paper drying unit 2, a carbon paper leveling unit 3, a first carbon paper heat treatment unit 4, a load coating unit 5, a second carbon paper heat treatment unit 6, a visual screening unit 7, an index detection unit 8 and a product packaging unit 9, which are connected in sequence, and a data processing unit, arranged according to a production process;

[0008] A unique QR code label is affixed to each piece of carbon paper to be produced, and the label is placed in a carrier; the carbon paper enters the production line, and the QR code on the carbon paper is scanned before entering each unit operation; when the adjacent subsequent unit is in a standby idle state, a signal allowing the carbon paper to be fed is sent to the adjacent previous unit, and the carrier carrying the carbon paper flows to the adjacent subsequent unit; the production process data and / or result data of each piece of carbon paper in each unit are collected and sent to the data processing unit.

[0009] Furthermore, the production line also includes a transport unit 1 , which is used to transport the carrier 104 coming out of the product packaging unit 9 to the product loading position 106 .

[0010] Furthermore, each unit of the production line independently includes a PLC controller, and the PLC controller controls the equipment in the unit to automatically operate according to the set program.

[0011] Furthermore, the data processing unit includes multiple edge servers and a database cloud server. The PLC controllers are respectively communicated with one edge server. The edge server and the database cloud server are communicated with each other. The PLC controller collects production process data and / or result data of the unit and sends it to the database cloud server.

[0012] Furthermore, the product packaging unit 9 performs a diversion operation on each piece of carbon paper according to the result data of whether the carbon paper is qualified or not screened by the visual screening unit 7 and the result data of whether the carbon paper is qualified or not detected by the indicator detection unit 8, which are recorded and stored in the data processing unit.

[0013] Furthermore, the diversion operation is to package the carbon paper judged as qualified by the visual screening module unit 7 and the index detection module unit 8, and to enter the unqualified carbon paper judged as unqualified by the visual screening module unit 7 and / or the index detection module unit 8 into the unqualified product branch line 10.

[0014] Furthermore, the data processing unit also includes an application cloud server, on which a digital twin virtual system is deployed, and production information is synchronously displayed through the digital twin virtual system.

[0015] Furthermore, the digital twin virtual system includes a digital twin virtual transportation subsystem, a digital twin virtual system, including a digital twin virtual carbon paper drying subsystem, a digital twin virtual carbon paper flattening subsystem, a digital twin virtual first carbon paper heat treatment subsystem, a digital twin virtual load coating subsystem, a digital twin virtual second carbon paper heat treatment subsystem, a digital twin virtual visualization screening subsystem, a digital twin virtual indicator detection subsystem and a digital twin virtual product packaging subsystem.

[0016] Furthermore, the production information includes visualized transportation process, carbon paper drying progress, carbon paper leveling effect, carbon paper heat treatment progress, three-dimensional spraying action and coating effect of the coating unit, carbon paper screening results of the visual screening unit, virtual 3D detection equipment dynamic detection model, SPC analysis report, index detection results and visualized packaging and stacking process.

[0017] The present invention also provides a carbon paper production system, comprising a data processing unit and a carbon paper drying unit 2, a carbon paper leveling unit 3, a first carbon paper heat treatment unit 4, a load coating unit 5, a second carbon paper heat treatment unit 6, a visual screening unit 7, an index detection unit 8 and a product packaging unit 9, which are sequentially connected in the production process sequence, and an auxiliary loading manipulator, which puts the carbon paper into a carrier 104 at a product loading position 106;

[0018] The carbon paper drying unit 2, the carbon paper leveling unit 3, the first carbon paper heat treatment unit 4, the load coating unit 5, the second carbon paper heat treatment unit 6, the visual screening unit 7, the index detection unit 8 and the product packaging unit 9 all independently include a PLC controller, and the PLC controller of each unit is used to control the equipment in the unit to automatically run according to the set program;

[0019] The data processing unit includes multiple edge servers and a database cloud server. The PLC controller of each unit is respectively communicated with one edge server. The edge server is communicated with the database cloud server. The database cloud server is used to store data.

[0020] Compared with the prior art, the present invention can achieve at least one of the following technical effects:

[0021] (1) The carbon paper production method of the present invention reduces the labor cost of carbon paper for fuel cells, improves production efficiency, and changes the previous intermittent production method, thereby realizing large-scale, low-cost, and low-energy consumption automated production.

[0022] (2) The data processing unit in the carbon paper production method of the present invention timely and accurately collects, records and stores the production process data, so that the entire process of carbon paper production from the beginning to the end of production is digitized, thereby being able to respond quickly to changes in the on-site environment and improve the stability, reliability and controllability of product quality.

[0023] (3) The digital twin virtual system of the present invention is bidirectionally mapped to the actual production line. By using virtual reality, augmented reality, modeling and simulation technologies, the virtual workshop models the multi-dimensional elements such as production factors, behaviors, and rules in the carbon paper production line, and obtains the geometric model, behavior model and rule model of the production line, so as to truly restore the physical workshop, continuously accumulate real-time data on carbon paper production, and combine 3D visualization technology to display production line information to management personnel in real time and dynamically.

[0024] (4) The digital twin virtual system of the present invention can realize full-process monitoring, can simultaneously access data locally and remotely, and realize digital display, which is convenient for operators and managers to understand the operation status of the production line, analyze the quality risks that may arise in the production process of the product, and adjust the production schedule in real time.

[0025] Other features and advantages of the present invention will be described in the following description, and part of them may become obvious from the description, or may be understood by practicing the present invention. The purpose and other advantages of the present invention may be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference numerals refer to like components throughout the drawings.

[0027] Figure 1 This is the unit layout diagram of the carbon paper production line;

[0028] Figure 2 This is the server architecture diagram of the digital twin virtual system;

[0029] Figure 3 It is a diagram of the composition of the digital twin virtual system;

[0030] Figure 4 Flow chart for the operation of the carbon paper production line.

[0031] In the figure: 1-transport unit; 100-carrier return line; 101-carrier separation mechanism; 102-first rotating mechanism; 103-second rotating mechanism; 104-carrier; 105-third rotating mechanism; 106-product loading position; 2-carbon paper drying unit; 3-carbon paper leveling unit; 4-first carbon paper heat treatment unit; 5-load coating unit; 6-second carbon paper heat treatment unit; 7-visual screening unit; 8-indicator detection unit; 9-product packaging unit; 10-unqualified product branch line; 200-first blocking code scanning mechanism, 300-second blocking code scanning mechanism, 400-third blocking code scanning mechanism, 500-fourth blocking code scanning mechanism, 600-fifth blocking code scanning mechanism, 700-sixth blocking code scanning mechanism, 800-seventh blocking code scanning mechanism, 900-eighth blocking code scanning mechanism. DETAILED DESCRIPTION

[0032] A carbon paper production method and system are further described in detail below in conjunction with specific examples. These examples are only used for comparison and explanation purposes, and the present invention is not limited to these examples.

[0033] The present invention provides a carbon paper production method, comprising a production line including a carbon paper drying unit (2), a carbon paper leveling unit (3), a first carbon paper heat treatment unit (4), a load coating unit (5), a second carbon paper heat treatment unit (6), a visual screening unit (7), an index detection unit (8) and a product packaging unit (9) which are connected in sequence according to a production process, and a data processing unit;

[0034] A unique QR code label is affixed to each piece of carbon paper to be produced, and the label is placed in a carrier; the carbon paper enters the production line, and the QR code on the carbon paper is scanned before entering each unit operation; when the adjacent subsequent unit is in a standby idle state, a signal allowing the carbon paper to be fed is sent to the adjacent previous unit, and the carrier carrying the carbon paper flows to the adjacent subsequent unit; the production process data and / or result data of each piece of carbon paper in each unit are collected and sent to the data processing unit.

[0035] It should be noted that the QR code attached to the carbon paper is the unique identity information of each piece of carbon paper. During the production process, the production process data and / or result data of each piece of carbon paper corresponds one-to-one to this QR code identification. After production is completed, the production process data and / or result data of the carbon paper can be obtained by scanning the QR code.

[0036] Specifically, the production line also includes an auxiliary loading robot for placing the carbon paper into a carrier for easy transportation, with each carrier containing one piece of carbon paper.

[0037] Furthermore, in order to realize automatic recycling of the carrier, a transport unit 1 is provided outside the above-mentioned unit, and the transport unit 1 is used to transport the carrier 104 coming out of the product packaging unit 9 to the product loading position 106 .

[0038] Figure 1 This is the unit layout diagram of the carbon paper production line.

[0039] Specifically, the transport unit 1, the carbon paper drying unit 2, the carbon paper leveling unit 3, the first carbon paper heat treatment unit 4, the load coating unit 5, the second carbon paper heat treatment unit 6, the visual screening unit 7, the index detection unit 8 and the product packaging unit 9 all independently include a PLC controller and a transport belt. The PLC controller of each unit is used to control the equipment in the unit to automatically run according to the set program, and the transport belt is used to transport the carrier according to the production process sequence.

[0040] Specifically, the carbon paper drying unit 2, the carbon paper leveling unit 3, the first carbon paper heat treatment unit 4, the load coating unit 5, the second carbon paper heat treatment unit 6, the visual screening unit 7, the index detection unit 8 and the product packaging unit 9 all independently include a blocking code scanning mechanism. The blocking code scanning mechanism is installed in front of the entrance of the unit, and is used to control the entry of the carrier 104 loaded with carbon paper and collect the two-dimensional code identity information on each piece of carbon paper.

[0041] Specifically, the blocking and scanning mechanism includes a blocking cylinder, a sensor and a barcode gun. The blocking cylinder intercepts or releases the carrier loaded with carbon paper according to the program instructions of the PLC controller in the unit. When the program of the PLC controller is in a standby idle state, the carrier loaded with carbon paper is released, otherwise the carrier loaded with carbon paper is intercepted. The sensor is used to determine whether the carbon paper product exists, and the barcode gun is used to scan the QR code on the carbon paper.

[0042] Specifically, the data processing unit includes multiple edge servers and a database cloud server. Each PLC controller belonging to the transportation unit 1, the carbon paper drying unit 2, the carbon paper leveling unit 3, the first carbon paper heat treatment unit 4, the load coating unit 5, the second carbon paper heat treatment unit 6, the visual screening unit 7, the index detection unit 8 and the product packaging unit 9 is respectively communicated with a corresponding edge server. The edge server is communicated with the database cloud server. The database cloud server is used to store the production process data and / or result data transmitted by the PLC controller of each unit through the edge server.

[0043] Specifically, the edge server is used to receive the production process data and / or result data information sent by the PLC controller of each unit, and send the received data information to the database cloud server. The edge server is equipped with an intelligent acquisition control program, which controls the information to be uploaded and issued between the PLC controller and the database cloud server. The edge server collects the production process data and / or result data through the OPC protocol, and inputs the data into the database cloud server through the ETL tool.

[0044] Specifically, the carbon paper drying unit 2 is used to dry the carbon paper under vacuum conditions. The carbon paper drying unit 2 is composed of a vacuum drying box, a vacuum pump, a layered storage device, a vacuum pressure detection instrument, a temperature sensor, a humidity sensor, a transport belt, a first blocking code scanning mechanism 200, and a first PLC controller. When the carbon paper is transported to the layered storage device in the vacuum drying box, the first PLC controller automatically closes the door according to the program design, starts the vacuum pump, and performs vacuum operation. At this time, the vacuum pressure detection instrument, temperature sensor, and humidity sensor in the drying box start to work according to the program.

[0045] Specifically, the carbon paper leveling unit 3 is used to level the carbon paper under certain temperature and pressure conditions. The carbon paper leveling unit 3 is composed of a hot pressing device, a temperature sensor, a pressure sensor, a conveyor belt, a second blocking code scanning mechanism 300, and a second PLC controller. According to the preset values ​​of the system parameters, the second PLC controller performs real-time operation according to the program design to intelligently adjust the temperature and pressure in the hot pressing device.

[0046] Specifically, the first carbon paper heat treatment unit 4 is used to heat treat the carbon paper according to a predetermined temperature system. The first carbon paper heat treatment unit 4 is composed of a thermocouple or a thermal resistor, a temperature sensor, a humidity sensor, a transport belt, a third blocking code scanning mechanism 400, and a third PLC controller. When the carbon paper is transported to the first carbon paper heat treatment unit, the third PLC controller automatically closes the hatch according to the program design, starts the thermocouple or thermal resistor to perform the carbon paper heat treatment operation, and at this time, the temperature sensor and humidity sensor in the first carbon paper heat treatment unit 4 start to work.

[0047] Specifically, the load coating unit 5 is used to spray the carbon material composite slurry on the surface of the carbon paper. The load coating unit 5 is composed of a spraying device, a conveying belt, a fourth blocking scanning mechanism 500, and a fourth PLC controller. When the carbon paper is transported to the load coating unit device, the fourth PLC controller starts the spraying device according to the program design to spray the load coating operation. The unit sets the load mode, load amount and other data of the load coating in the spraying device controller, and sends the load mode, load amount and other data to the fourth PLC controller through RS485 serial port communication. The fourth PLC controller controls the three-axis module to complete uniform spraying.

[0048] Specifically, the second carbon paper heat treatment unit 6 is used to perform a second heat treatment on the carbon paper after the coating is loaded. The second carbon paper heat treatment unit 6 is composed of a thermocouple or a thermal resistor, a temperature sensor, a humidity sensor, a transport belt, a fifth blocking code scanning mechanism 600, and a fifth PLC controller. When the carbon paper is transported to the second carbon paper heat treatment unit 6, the fifth PLC controller automatically closes the hatch according to the program design, and starts the thermocouple or thermal resistor to perform a secondary heat treatment operation after the thin film coating is loaded. At this time, the temperature sensor and humidity sensor in the heat treatment unit start working.

[0049] Specifically, the visual screening unit 7 is used to detect whether there are defects on the surface of the carbon paper and whether the flatness of the carbon paper meets the requirements. The visual screening unit 7 is composed of a visual industrial computer, a laser measuring instrument, a transport belt, a sixth blocking code scanning mechanism 700, and a sixth PLC controller. When the carbon paper is transported to the visual screening unit, the unit starts the visual industrial computer and the laser measuring instrument according to the program design by the sixth PLC controller. The visual industrial computer includes a high-definition camera and an automatic image recognition system. The high-definition camera takes pictures of the carbon paper at a high frequency. The automatic image recognition system deploys an image recognition algorithm model to segment the carbon paper image, identify and extract feature information that characterizes whether the carbon paper surface has defects, and judge whether it is flat based on the laser measurement of the carbon paper flatness, and finally outputs the result data of whether the screened carbon paper is qualified or not.

[0050] Specifically, the index detection unit 8 is used to detect the resistance value, pore size, permeability, contact angle, thermal conductivity, etc. of the carbon paper. The index detection unit 8 is composed of a block resistance meter, a gas flux meter, a contact angle meter, a thermal conductivity meter, etc., as well as a conveyor belt, a seventh blocking code scanning mechanism 800, and a seventh PLC controller. After the carbon paper is transported to the index detection unit, the unit controls the high-precision detection characterization equipment to detect the resistance value, pore size, permeability, contact angle, thermal conductivity, etc. of the carbon paper through the seventh PLC controller according to the program design. Finally, the detection data and the result data of whether the detected carbon paper is qualified or not are output.

[0051] Specifically, the product packaging unit 9 is used to screen and divert qualified and unqualified carbon paper, unqualified products enter the unqualified product branch line 10, and qualified products are automatically packaged and stored. The product packaging unit 9 is composed of intelligent layered storage shelves, intelligent AGV, roller conveyor belt, automatic packaging machine, transport belt, the eighth blocking code scanning mechanism 900, packaging and screening table, unqualified product branch line 10, and the eighth PLC controller. After the carbon paper is transported to the product packaging unit, the unit is operated according to the program design through the eighth PLC controller. The packaging and screening table classifies qualified and unqualified carbon paper, unqualified products enter the unqualified product branch line 10, and qualified products enter the automatic packaging machine. After the automatic packaging machine automatically packs the product, the production line staff places it on the roller conveyor belt and transmits it to the unloading storage area. The intelligent AGV places the packaged carbon paper in the empty space on the layered storage shelf. When the storage area is full, the intelligent layered storage shelf automatically alarms to remind the operator or the intelligent robot to replace the storage shelf.

[0052] It should be noted that after the product packaging unit 9 scans the QR code on the carbon paper, each piece of carbon paper is diverted according to the result data of whether the carbon paper is qualified or not screened by the visual screening module and the result data of whether the carbon paper is qualified or not detected by the index detection module, which are recorded and stored in the data processing module. The carbon paper that is judged as qualified by the visual screening unit 7 and the index detection unit 8 is packaged, and the carbon paper that is judged as unqualified by the visual screening unit 7 and / or the index detection unit 9 enters the unqualified product branch line 10. After the packaging operation is completed, the carrier enters the transportation unit for recycling.

[0053] Specifically, the transport unit 1 is used to transport the carrier. The transport unit 1 consists of a carrier return line 100, a carrier separation mechanism 101, a first rotating mechanism 102, a loading module, a third rotating mechanism 105, and a ninth PLC controller. The transport unit 1 is a right-angled U-shape, one end of which is connected to the product packaging unit 9, and the other end is connected to the product loading position 106. The carrier return line 100 is divided into three sections, forming three sides of the right-angled U-shape. The first rotating mechanism 102 and the third rotating mechanism 105 are located at two right angles of the right-angled U-shape; the carrier separation mechanism 101 is arranged on the carrier return line 100, located on the bottom edge of the right-angled U-shape, adjacent to the first rotating mechanism 102; the loading module is located at the loading position 106. According to the flow direction of the carrier 104, the connection sequence of the transport unit 1 is: product packaging unit 9→carrier return line 100→third rotating mechanism 105→carrier return line 100 (carrier separation mechanism 101)→first rotating mechanism 102→carrier return line 100→loading module (loading position 106).

[0054] The carrier return line 100 provides a return of the carrier 104 carrying carbon paper for the entire line so as to be recycled and reused, in the form of a transport belt.

[0055] Specifically, the carrier separation mechanism 101 is composed of two blocking mechanisms and two sensors for detecting the carriers. The installation spacing of the two blocking mechanisms is the length of the carrier. The two detection sensors are respectively installed in front of the blocking mechanisms to separate two closely connected carriers so that the carriers 104 can enter the production line one by one.

[0056] Specifically, the rotating mechanism is composed of a lifting cylinder and a rotating cylinder, and is used to change the flow direction of the carrier.

[0057] Specifically, the loading module includes a second rotating mechanism 103 and a sensor, which are located at a product loading position 106, where an auxiliary loading robot places the carbon paper on a carrier 104 on the second rotating mechanism 103, and then the carrier loaded with carbon paper flows to the carbon paper drying unit 2.

[0058] When the carrier is transported to the transport unit 1, the unit controls the carrier's running speed and loading according to the program design through the PLC controller.

[0059] In order to realize remote wireless access to data, facilitate full-process monitoring of carbon paper production, and help operators and managers understand the operation of the production line, as well as automatically monitor the quality of carbon paper and adjust production arrangements in real time, the data processing unit also includes an application cloud server. The database cloud server and the application cloud server are communicated with each other. The application cloud server stores and calls the data of the database cloud server, and a digital twin virtual system is deployed on the application cloud server.

[0060] Specifically, a digital twin virtual system corresponding to the transportation unit 1, carbon paper drying unit 2, carbon paper leveling unit 3, first carbon paper heat treatment unit 4, load coating unit 5, second carbon paper heat treatment unit 6, visual screening unit 7, index detection unit 8, and product packaging unit 9 is deployed on the application cloud server, and production information is synchronously displayed through the digital twin virtual system. Figure 2 This is the server architecture diagram of the digital twin virtual system.

[0061] Specifically, the digital twin virtual system on the application cloud server is composed of virtual subsystems corresponding to each unit, including a digital twin virtual carbon paper drying subsystem, a digital twin virtual carbon paper flattening subsystem, a digital twin virtual first carbon paper heat treatment subsystem, a digital twin virtual load coating subsystem, a digital twin virtual second carbon paper heat treatment subsystem, a digital twin virtual visualization screening subsystem, a digital twin virtual indicator detection subsystem, a digital twin virtual product packaging subsystem and a digital twin virtual transportation subsystem. Figure 3 This is a diagram of the digital twin virtual system composition.

[0062] Specifically, the digital twin virtual transportation subsystem synchronously visualizes the transportation process based on the real-time carrier running speed and loading status data obtained from the database cloud server, providing online remote monitoring for managers and workers; the digital twin virtual carbon paper drying subsystem displays the real-time carbon paper drying progress based on the real-time basic data such as vacuum pressure, drying temperature, humidity, etc. obtained from the database cloud server; the digital twin virtual carbon paper flattening subsystem outputs the carbon paper stress change curve, SPC analysis chart and other carbon paper flattening effects based on the real-time temperature and pressure data obtained from the database cloud server; the digital twin virtual first carbon paper heat treatment subsystem displays the carbon paper heat treatment progress in real time based on the real-time basic data such as temperature, humidity, time, etc. obtained from the database cloud server; the digital twin virtual load coating subsystem displays the real-time carbon paper leveling effect based on the real-time temperature and pressure data obtained from the database cloud server. The real-time data obtained in the spraying equipment controller displays the three-dimensional spraying action and the technical effect of the coating in real time; the digital twin virtual second carbon paper heat treatment subsystem displays the progress of carbon paper heat treatment in real time based on the real-time basic data such as temperature, humidity, time, etc. obtained from the database cloud server; the digital twin virtual visualization screening subsystem displays the results of carbon paper screening in real time based on the real-time data of whether the product is qualified obtained from the database cloud server; the digital twin virtual indicator detection subsystem displays the dynamic detection model of the virtual 3D detection equipment based on the real-time detection data obtained from the database cloud server, and outputs SPC analysis reports and indicator detection results; the digital twin virtual product packaging subsystem synchronously visualizes the packaging and stacking process based on the real-time packaging data obtained from the database cloud server, providing online remote monitoring for managers and workers.

[0063] Specifically, the carbon paper production method of the present invention comprises the following steps:

[0064] Step S1: Power on the production line, initialize the equipment, start the data processing unit, and run the digital twin virtual system on the data processing unit application cloud server;

[0065] Step S2, the carrier return line 100 of the transport unit 1 sequentially transports the carriers 104 coming out of the product packaging unit 9 to the product loading position 106, and the auxiliary loading robot places the carbon paper with the QR code label on the carrier 104, and the product flows to the carbon paper drying unit 2; in this process, the digital twin virtual transport subsystem on the cloud server is used to synchronously visualize the transport process;

[0066] Step S3, the carrier loaded with carbon paper continues to flow, and the first blocking code scanning mechanism 200 of the carbon paper drying unit 2 scans the QR code on the carbon paper. After the code scanning is completed, the carrier loaded with carbon paper enters the carbon paper drying unit 2. After the vacuum drying process is completed, the carrier loaded with carbon paper flows out of the carbon paper drying unit 2; in this process, the digital twin virtual carbon paper drying subsystem on the application cloud server synchronously displays the carbon paper drying progress;

[0067] Step S4, the carrier loaded with carbon paper continues to flow, and the second blocking code scanning mechanism 300 of the carbon paper leveling unit 3 scans the QR code on the carbon paper. After the code scanning is completed, the carrier loaded with carbon paper enters the carbon paper leveling unit 3. After the hot pressing process is completed, the carrier loaded with carbon paper flows out of the carbon paper leveling unit 3; in this process, the digital twin virtual carbon paper leveling subsystem on the cloud server is used to synchronously display the technical effect of carbon paper leveling;

[0068] Step S5, the carrier loaded with carbon paper continues to flow, and the third blocking code scanning mechanism 400 of the first carbon paper heat treatment unit 4 scans the QR code on the carbon paper. After the code scanning is completed, the carrier loaded with carbon paper enters the first carbon paper heat treatment unit 4. After the heat treatment process is completed, the carrier loaded with carbon paper flows out of the first carbon paper heat treatment unit 4; in this process, the digital twin virtual first carbon paper heat treatment subsystem on the cloud server is used to synchronously display the progress of the carbon paper heat treatment;

[0069] Step S6, the carrier loaded with carbon paper continues to flow, and the fourth blocking code scanning mechanism 500 of the load coating unit 5 scans the QR code on the carbon paper. After the code scanning is completed, the carrier loaded with carbon paper enters the load coating unit 5. After the spraying is completed, the carrier loaded with carbon paper flows out of the load coating unit 5; in this process, the digital twin virtual load coating subsystem on the cloud server is used to synchronously display the three-dimensional spraying action and the technical effect of the coating;

[0070] Step S7, the carrier loaded with carbon paper continues to flow, and the fifth blocking code scanning mechanism 600 of the second carbon paper heat treatment unit 6 scans the QR code on the carbon paper. After the code scanning is completed, the carrier loaded with carbon paper enters the second carbon paper heat treatment unit 6. After the heat treatment is completed, the carrier loaded with carbon paper flows out of the second carbon paper heat treatment unit 6; in this process, the digital twin virtual second carbon paper heat treatment subsystem on the cloud server is used to synchronously display the progress of the carbon paper heat treatment;

[0071] Step S8, the carrier loaded with carbon paper continues to flow, and the sixth blocking code scanning mechanism 700 of the visual screening unit 7 scans the QR code on the carbon paper. After the code scanning is completed, the carrier loaded with carbon paper enters the visual screening unit 7. After the screening is completed, the carrier loaded with carbon paper flows out of the visual screening unit 7; in this process, the digital twin virtual visual screening subsystem on the application cloud server synchronously displays the results of carbon paper screening;

[0072] Step S9, the carrier loaded with carbon paper continues to flow, and the seventh blocking code scanning mechanism 800 of the index detection unit 8 scans the QR code on the carbon paper. After the code scanning is completed, the carrier loaded with carbon paper enters the index detection unit 8; after the detection is completed, the carrier loaded with carbon paper flows out of the index detection unit 8; in this process, the digital twin virtual index detection subsystem on the application cloud server synchronously displays the virtual 3D detection equipment dynamic detection model, and outputs the results of the SPC analysis report index detection;

[0073] Step S10, the carrier loaded with carbon paper continues to flow, the eighth blocking code scanning mechanism 900 of the product packaging unit 9 scans the QR code on the carbon paper and determines whether the carbon paper is qualified or not. After the code scanning is completed, the carrier loaded with carbon paper enters the packaging screening table of the product packaging unit 9 for screening, the carrier loaded with unqualified carbon paper is unloaded from the unqualified product branch line 10, and the carrier loaded with qualified carbon paper enters the automatic packaging machine. After the packaging is completed, the carrier 104 enters the transportation unit 1 and returns to step S2, or enters step S11; in this process, the digital twin virtual product packaging subsystem on the cloud server is used to synchronize and visualize the packaging and stacking process;

[0074] Step S11, when production is finished, exit the digital twin virtual system on the application cloud server, shut down the data processing unit, and turn off the main power supply of the production line.

[0075] Specifically, in step S2, the carrier return line 100 of the transport unit 1 transfers the multiple carriers 104 thereon to the carrier separation mechanism 101, and the carrier separation mechanism 101 controls the carriers 104 to pass through the first rotating mechanism 102 one by one, and the first rotating mechanism 102 changes the flow direction of the carriers 104 to the second rotating mechanism 103 of the loading module. When the lifting cylinder of the second rotating mechanism 103 is in the rising position, the sensor of the loading module senses the carrier 104, and the auxiliary loading robot places the carbon paper with the QR code label on the carrier 104, and the rotating cylinder of the second rotating mechanism 103 The cylinder rotates the carrier 90 degrees and waits for the ninth PLC controller of the transport unit 1 to receive the signal from the first PLC controller of the carbon paper drying unit 2 allowing the discharge of the material. Then, the lifting cylinder of the second rotating mechanism 103 descends and the product flows to the carbon paper drying unit 2. During this process, the edge server in the data processing unit that communicates with the ninth PLC controller collects real-time data from the ninth PLC controller of the transport unit 1 and inputs it into the database cloud server. The cloud server is used to call the data of the database cloud server, and the digital twin virtual transportation subsystem on the cloud server is used to synchronously visualize the transportation process.

[0076] Specifically, in step S3, the carrier loaded with carbon paper is blocked in the blocking position by the blocking cylinder of the first blocking scanning mechanism 200 of the carbon paper drying unit 2. After the sensor senses the product, the barcode gun starts to scan the QR code on the carbon paper. After the scanning is completed, the first PLC controller of the carbon paper drying unit 2 is waited for to send a signal allowing carbon paper feeding. The first scanning blocking mechanism 200 is released. At the same time, the first PLC controller of the carbon paper drying unit 2 sends a signal prohibiting unloading to the ninth PLC controller of the transport unit 1. The carrier loaded with carbon paper enters the vacuum drying box of the carbon paper drying unit 2. After the vacuum drying process is completed, the carbon paper drying unit 2 waits for collection. After receiving the signal allowing discharge from the carbon paper leveling unit 3, the carrier loaded with carbon paper flows out of the carbon paper drying unit 2, and when the program of the first PLC controller of the carbon paper drying unit 2 is in standby idle state, a signal allowing discharge is sent to the ninth PLC controller of the transport unit 1; in this process, the edge server in the data processing unit that is communicated with the first PLC controller collects real-time production data from the first PLC controller of the carbon paper drying unit 2, and inputs it into the database cloud server, the application cloud server calls the data of the database cloud server, and the digital twin virtual carbon paper drying subsystem on the application cloud server synchronously displays the carbon paper drying progress.

[0077] Specifically, in step S4, the carrier loaded with carbon paper is blocked in the blocking position by the blocking cylinder of the second blocking code scanning mechanism 300 of the carbon paper leveling unit 3. After the sensor senses the product, the barcode gun starts to scan the QR code on the carbon paper. After the code scanning is completed, the second PLC controller of the carbon paper leveling unit 3 is waited for to send a signal allowing carbon paper feeding, and the second blocking code scanning mechanism 300 is released. At the same time, the second PLC controller of the carbon paper leveling unit 3 sends a signal prohibiting discharging to the first PLC controller of the carbon paper drying unit 2, and the carrier loaded with carbon paper enters the carbon paper leveling unit 3. After the hot pressing process is completed, the carbon paper leveling unit 3 waits for the first carbon paper to be received. After the heat treatment unit 4 sends a signal allowing discharge, the carrier loaded with carbon paper flows out of the carbon paper leveling unit 3, and when the program of the second PLC controller of the carbon paper leveling unit 3 is in a standby idle state, a signal allowing discharge is sent to the first PLC controller of the carbon paper drying unit 2; in this process, the edge server in the data processing unit that communicates with the second PLC controller collects real-time production data from the second PLC controller of the carbon paper leveling unit 3, inputs it into the database cloud server, and the application cloud server calls the data of the database cloud server, and the digital twin virtual carbon paper leveling subsystem on the application cloud server synchronously displays the carbon paper leveling effect.

[0078] Specifically, in step S5, the carrier loaded with carbon paper is blocked in the blocking position by the blocking cylinder of the third blocking scanning mechanism 400 of the first carbon paper heat treatment unit 4. After the sensor senses the product, the barcode gun starts to scan the QR code on the carbon paper. After the scanning is completed, the third PLC controller of the first carbon paper heat treatment unit 4 is waited for to send a signal to allow carbon paper feeding, and the third scanning blocking mechanism 400 is released. At the same time, the third PLC controller of the first carbon paper heat treatment unit 4 sends a signal prohibiting discharging to the second PLC controller of the carbon paper flattening unit 3, and the carrier loaded with carbon paper enters the first carbon paper heat treatment unit 4. After the heat treatment process is completed, the first carbon paper heat treatment unit 4 waits for receiving the load After the coating unit 5 sends a signal allowing discharge, the carrier containing carbon paper flows out of the first carbon paper heat treatment unit 4, and when the program of the third PLC controller of the first carbon paper heat treatment unit 4 is in standby idle state, a signal allowing discharge is sent to the second PLC controller of the carbon paper flattening unit 3; in this process, the edge server in the data processing unit that is communicated with the third PLC controller collects real-time production data from the third PLC controller of the first carbon paper heat treatment unit 4, and inputs it into the database cloud server, the application cloud server calls the data of the database cloud server, and the digital twin virtual first carbon paper heat treatment subsystem on the application cloud server synchronously displays the progress of carbon paper heat treatment.

[0079] Specifically, in step S6, the carrier loaded with carbon paper is blocked in the blocking position by the blocking cylinder of the fourth blocking code scanning mechanism 500 of the load coating unit 5. After the sensor senses the product, the barcode gun starts to scan the QR code on the carbon paper. After the code scanning is completed, the fourth PLC controller of the load coating unit 5 is waited for to send a signal to allow carbon paper feeding, and the fourth blocking code scanning mechanism 500 is released. At the same time, the fourth PLC controller of the load coating unit 5 sends a signal prohibiting discharging to the third PLC controller of the first carbon paper heat treatment unit 4, and the carrier loaded with carbon paper enters the load coating unit 8; after the spraying is completed, the load coating unit 5 waits to receive the signal from the second carbon paper heat treatment unit 4. 6 After the signal allowing discharge is sent, the carrier loaded with carbon paper flows out of the load coating unit 5, and the program of the fourth PLC controller of the load coating unit 5 is in a standby idle state, and a signal allowing discharge is sent to the third PLC controller of the first carbon paper heat treatment unit 4; in this process, the data processing unit communicates with the fourth PLC controller to connect to the edge server to collect real-time production data in the fourth PLC controller of the load coating unit 5, and inputs it into the database cloud server, the application cloud server calls the data of the database cloud server, and the digital twin virtual load coating subsystem on the application cloud server synchronously displays the three-dimensional spraying action and the coating effect.

[0080] Specifically, in step S7, the carrier loaded with carbon paper is blocked in the blocking position by the blocking cylinder of the fifth blocking code scanning mechanism 600 of the second carbon paper heat treatment unit 6. After the sensor senses the product, the barcode gun starts to scan the QR code on the carbon paper. After the scanning is completed, the fifth PLC controller of the second carbon paper heat treatment unit 6 is waited for to send a signal to allow carbon paper feeding. The fifth blocking code scanning mechanism 600 is released. At the same time, the fifth PLC controller of the second carbon paper heat treatment unit 6 sends a signal prohibiting discharging to the fourth PLC controller of the load coating unit 5, and the carrier loaded with carbon paper enters the second carbon paper heat treatment unit 6. After the heat treatment is completed, the second carbon paper heat treatment unit 6 waits for receiving the visual After the screening unit 7 sends a signal allowing discharge, the carrier containing carbon paper flows out of the second carbon paper heat treatment unit 6, and when the program of the fifth PLC controller of the second carbon paper heat treatment unit 6 is in standby idle state, a signal allowing discharge is sent to the fourth PLC controller of the load coating unit 5; in this process, the edge server in the data processing unit that is communicated with the fifth PLC controller collects real-time production data from the fifth PLC controller of the second carbon paper heat treatment unit 6, and inputs it into the database cloud server, the application cloud server calls the data of the database cloud server, and the digital twin virtual second carbon paper heat treatment subsystem on the application cloud server synchronously displays the progress of carbon paper heat treatment.

[0081] Specifically, in step S8, the carrier loaded with carbon paper is blocked in the blocking position by the blocking cylinder of the sixth blocking code scanning mechanism 700 of the visual screening unit 7. After the sensor senses the product, the barcode gun starts to scan the QR code on the carbon paper. After the scanning is completed, the sixth PLC controller of the visual screening unit 7 sends a signal to allow carbon paper feeding. The sixth blocking code scanning mechanism 700 releases it. At the same time, the sixth PLC controller of the visual screening unit 7 sends a signal to prohibit discharging to the fifth PLC controller of the second carbon paper heat treatment unit 6, and the carrier loaded with carbon paper enters the visual screening unit 7. After the screening is completed, the visual screening unit 7 waits for the receipt of the indicator detection signal. After the measuring unit 8 sends a signal allowing discharge, the carrier loaded with carbon paper flows out of the visual screening unit 7, and the program of the sixth PLC controller of the visual screening unit 7 is in a standby idle state, and a signal allowing discharge is sent to the fifth PLC controller of the second carbon paper heat treatment unit 6; in this process, the edge server in the data processing unit that is communicated with the sixth PLC controller collects real-time data in the sixth PLC controller of the visual screening unit 7, and inputs it into the database cloud server, the application cloud server calls the data of the database cloud server, and the digital twin virtual visualization screening subsystem on the application cloud server synchronously displays the results of carbon paper screening.

[0082] Specifically, in step S9, the carrier loaded with carbon paper is blocked in the blocking position by the blocking cylinder of the seventh blocking code scanning mechanism 800 of the indicator detection unit 8. After the sensor senses the product, the barcode gun starts to scan the QR code on the carbon paper. After the scanning is completed, the seventh PLC controller of the indicator detection unit 8 is waited for to send a signal to allow carbon paper feeding, and the seventh blocking code scanning mechanism 800 is released. At the same time, the seventh PLC controller of the indicator detection unit 8 sends a signal to prohibit discharging to the sixth PLC controller of the visual screening unit 7, and the carrier loaded with carbon paper enters the indicator detection unit 9. After the detection is completed, the indicator detection unit 8 waits for the signal from the packaging unit 9 to allow discharging, and then the carrier loaded with carbon paper enters the indicator detection unit 9. The carbon paper carrier flows out of the index detection unit 8, and when the program of the seventh PLC controller of the index detection unit 8 is in a standby idle state, a signal allowing discharge is sent to the sixth PLC controller of the visual screening unit 7; in this process, the edge server in the data processing unit that is communicated with the seventh PLC controller collects real-time data from the seventh PLC controller of the index detection unit 8, and inputs it into the database cloud server, the application cloud server calls the data of the database cloud server, and the digital twin virtual index detection subsystem on the application cloud server synchronously displays the virtual 3D detection equipment dynamic detection model, and outputs the SPC analysis report and the results of the index detection.

[0083] Specifically, in step S10, the carrier loaded with carbon paper is blocked in the blocking position by the blocking cylinder of the eighth blocking code scanning mechanism 900 of the packaging unit 9. After the sensor senses the product, the barcode gun starts to scan the QR code on the carbon paper and judge whether the carbon paper is qualified or not. After the code scanning is completed, the eighth PLC controller of the packaging unit 9 is waited for to send a signal to allow carbon paper feeding, and the eighth blocking code scanning mechanism 900 is released. At the same time, the eighth PLC controller of the packaging unit 9 sends a signal prohibiting discharging to the seventh PLC controller of the indicator detection unit 8. The carrier loaded with carbon paper enters the packaging screening table of the packaging unit 9 for screening, and the carrier loaded with unqualified carbon paper is unloaded from the unqualified product branch line 10, and the carrier loaded with qualified carbon paper is unloaded from the unqualified product branch line 10. Enter the automatic packaging machine; after packaging is completed, the program of the eighth PLC controller of the packaging unit 9 is in a standby idle state, and a signal allowing discharge is sent to the seventh PLC controller of the indicator detection unit 8, and the carrier 104 enters the carrier return line 100 of the transport unit 1, returns to step S2, or enters step S11; in this process, the edge server in the data processing unit that is communicated with the eighth PLC controller collects real-time data in the eighth PLC controller of the product packaging unit 9, and inputs it into the database cloud server, the application cloud server calls the data of the database cloud server, and the digital twin virtual product packaging subsystem on the application cloud server synchronously visualizes the packaging and stacking process.

[0084] It should be noted that in step S2, the ninth PLC controller of the transport unit 1 and the auxiliary loading manipulator exchange information through digital quantity IO, and send signals to allow loading and complete loading. In steps S2 to S10, the PLC controllers of each unit send signals to allow or prohibit unloading to the unit of the previous process through the standard universal SMEMA protocol.

[0085] In step S10, after the barcode gun of the eighth blocking scanning mechanism of the product packaging unit 9 scans the QR code on the carbon paper, the edge server that is communicatively connected to the eighth PLC controller of the product packaging unit 9 obtains the carbon paper QR code, and then queries the database cloud server for information on whether the carbon paper is qualified in the visual screening unit 7 and the index detection unit 8, and sends the query result to the eighth PLC controller of the product packaging unit 9. The eighth PLC controller of the product packaging unit 9 screens and diverts the carbon paper on the packaging screening table according to this information.

[0086] Figure 4 Flow chart for the operation of the carbon paper production line.

[0087] The present invention also provides a carbon paper production system, comprising a data processing unit and a carbon paper drying unit 2, a carbon paper leveling unit 3, a first carbon paper heat treatment unit 4, a load coating unit 5, a second carbon paper heat treatment unit 6, a visual screening unit 7, an index detection unit 8 and a product packaging unit 9, which are sequentially connected in the production process sequence, and an auxiliary loading manipulator, which puts the carbon paper into a carrier 104 at a product loading position 106;

[0088] The carbon paper drying unit 2, the carbon paper leveling unit 3, the first carbon paper heat treatment unit 4, the load coating unit 5, the second carbon paper heat treatment unit 6, the visual screening unit 7, the index detection unit 8 and the product packaging unit 9 all independently include a PLC controller, and the PLC controller of each unit is used to control the equipment in the unit to automatically run according to the set program;

[0089] The data processing unit includes multiple edge servers and a database cloud server. The PLC controller of each unit is respectively connected to a corresponding edge server for communication. The edge server is connected to the database cloud server for communication. The database cloud server is used to store data.

[0090] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for producing carbon paper, characterized in that: The production method comprises: A production line is provided according to the production process, comprising a carbon paper drying unit (2), a carbon paper leveling unit (3), a first carbon paper heat treatment unit (4), a load coating unit (5), a second carbon paper heat treatment unit (6), a visual screening unit (7), an index detection unit (8) and a product packaging unit (9) which are connected in sequence, and a data processing unit; Affix a unique QR code label to each piece of carbon paper to be produced and place it in the carrier; The carbon paper enters the production line and scans the QR code on the carbon paper before entering each unit. When the adjacent unit is in idle state, a signal to allow the carbon paper to be fed is sent to the adjacent unit, and the carrier carrying the carbon paper flows to the adjacent unit. The production process data and / or result data of each carbon paper of each unit are collected and sent to the data processing unit.

2. The carbon paper production method according to claim 1, characterized in that: The production line further comprises a transport unit (1), which is used to transport the carrier (104) coming out of the product packaging unit (9) to a product loading position (106).

3. The carbon paper production method according to claim 1, characterized in that: Each unit of the production line independently includes a PLC controller, and the PLC controller controls the equipment in the unit to automatically run according to the set program.

4. The carbon paper production method according to claim 1, characterized in that: The data processing unit includes multiple edge servers and a database cloud server. The PLC controllers are respectively communicated with one edge server. The edge servers are communicated with the database cloud server. The PLC controllers collect production process data and / or result data of the unit and send them to the database cloud server.

5. The carbon paper production method according to claim 1, characterized in that: The product packaging unit (9) performs a flow separation operation on each piece of carbon paper based on the result data of whether the carbon paper is qualified or not screened by the visual screening unit (7) and the result data of whether the carbon paper is qualified or not detected by the index detection unit (8), which are recorded and stored in the data processing unit.

6. The carbon paper production method according to claim 5, characterized in that: The diversion operation is to package the carbon paper that is judged as qualified by the visual screening module unit (7) and the index detection module unit (8), and to enter the unqualified carbon paper that is judged as unqualified by the visual screening module unit (7) and / or the index detection module unit (8) into the unqualified product branch line (10).

7. The carbon paper production method according to claim 1, characterized in that: The data processing unit also includes an application cloud server, on which a digital twin virtual system is deployed, and production information is synchronously displayed through the digital twin virtual system.

8. The carbon paper production method according to claim 7, characterized in that: The digital twin virtual system includes a digital twin virtual transportation subsystem, a digital twin virtual system, including a digital twin virtual carbon paper drying subsystem, a digital twin virtual carbon paper flattening subsystem, a digital twin virtual first carbon paper heat treatment subsystem, a digital twin virtual load coating subsystem, a digital twin virtual second carbon paper heat treatment subsystem, a digital twin virtual visualization screening subsystem, a digital twin virtual indicator detection subsystem and a digital twin virtual product packaging subsystem.

9. The carbon paper production method according to claim 7, characterized in that: The production information includes visualized transportation process, carbon paper drying progress, carbon paper leveling effect, carbon paper heat treatment progress, three-dimensional spraying action and coating effect of the coating unit, carbon paper screening results of the visualized screening unit, virtual 3D detection equipment dynamic detection model, SPC analysis report, index detection results and visualized packaging and stacking process.

10. A carbon paper production system, used to implement the carbon paper production method according to any one of claims 1 to 9, characterized in that: The invention comprises a data processing unit and a carbon paper drying unit (2), a carbon paper leveling unit (3), a first carbon paper heat treatment unit (4), a load coating unit (5), a second carbon paper heat treatment unit (6), a visual screening unit (7), an index detection unit (8) and a product packaging unit (9) which are connected in sequence according to the production process, and an auxiliary loading robot, wherein the auxiliary loading robot puts the carbon paper into a carrier (104) at a product loading position (106); The carbon paper drying unit (2), the carbon paper leveling unit (3), the first carbon paper heat treatment unit (4), the load coating unit (5), the second carbon paper heat treatment unit (6), the visual screening unit (7), the index detection unit (8) and the product packaging unit (9) all independently include a PLC controller, and the PLC controller of each unit is used to control the equipment in the unit to automatically operate according to a set program; The data processing unit includes multiple edge servers and a database cloud server. The PLC controller of each unit is respectively communicated with one edge server. The edge server is communicated with the database cloud server. The database cloud server is used to store data.

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