A carbon paper production system and method

Abstract

The present application belongs to the field of industrialized production of carbon paper and the like, and particularly relates to a carbon paper production system and method, which solves the problem of large-scale, low-cost and low-energy-consumption automatic production of carbon paper for fuel cells. The carbon paper production system of the present application comprises a data processing unit and, sequentially connected in the order of production procedures, 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, as well as an auxiliary feeding manipulator, which places the carbon paper into a carrier at a product feeding position. The production system of the present application changes the previous intermittent production mode and is beneficial to the precision and rapid response of production and quality control.

Description

Technical Field

[0001] This invention belongs to the field of industrial production of carbon paper and other thin films, and is particularly applicable to the large-scale and automated production of carbon paper. It specifically relates to a carbon paper production system and method. Background Technology

[0002] Proton exchange membrane fuel cells (PEMFCs) are considered the preferred clean and high-efficiency power generation device due to their high power density, high energy conversion efficiency, rapid low-temperature start-up, pollution-free operation, and long battery life. They have enormous application potential in transportation fields such as new energy vehicles, armored vehicles, heavy trucks, and buses. In fuel cells, the membrane electrode assembly (MEA) is the core component, which is not only expensive in terms of raw materials but also requires sophisticated manufacturing processes. The MEA is a composite assembly formed by combining a proton exchange membrane as the core layer with a catalyst layer and a gas diffusion layer on either side. The gas diffusion layer is a key component affecting battery performance, supporting the catalyst layer and stabilizing the electrode structure. It also provides gas, electron, and drainage channels for the electrode reaction.

[0003] Carbon materials, including carbon fiber paper, carbon fiber cloth, and carbon fiber felt, are primarily used to prepare the gas diffusion layer. Currently, the main technical approach involves compounding carbon fibers with polymer binders, followed by complex processes such as vacuum drying, leveling, and high-temperature carbonization to obtain carbon fiber paper. While some methods disperse carbon fibers in pulp, followed by manual papermaking and drying to obtain a carbon paper preform, this preform still requires multiple processing steps, including secondary coating, vacuum drying, leveling, and heat treatment (including high-temperature carbonization). Due to the brittle nature of carbon paper, it is easily broken when bent in actual production. Therefore, many processes must be performed manually, making automation and continuous production difficult. For example, the graphitization process for carbon paper often requires intermittent operation, which significantly limits the large-scale production of carbon fiber paper and results in high costs and energy consumption.

[0004] On the one hand, any problem in any step requires manual handling, which is time-consuming and labor-intensive, inefficient, and increases labor costs, hindering the cost reduction of carbon paper production. On the other hand, problems in carbon paper preparation are difficult to trace back to specific process steps, such as quickly identifying the cause of problems in actual production, rapidly checking for equipment malfunctions, human error, and conducting process flow tracking and quality control reviews. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide a carbon paper production system. This system realizes the carbon paper preparation process based on cloud storage digital display and quality control, so as to achieve large-scale, low-cost, low-energy-consumption automated production of carbon paper for fuel cells, and facilitates precise and rapid response in production and quality control.

[0006] The objective of this invention is mainly achieved through the following technical solutions:

[0007] The present invention provides a carbon paper production system, including a data processing unit and 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 connected in sequence according to the production process, as well as an auxiliary feeding robot, which places carbon paper into carrier 104 at product feeding position 106;

[0008] The 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 each independently include a PLC controller. The PLC controller of each unit is used to control the equipment in the unit to run automatically according to the set program.

[0009] The data processing unit includes multiple edge servers and a database cloud server. Each unit's PLC controller has a corresponding communication connection with an edge server. The edge servers and the database cloud server have a communication connection, and the database cloud server is used to store data.

[0010] Furthermore, the 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 each independently include a conveyor belt and a blocking scanning mechanism. The conveyor belt is used to transport the carrier according to the production process sequence, and the blocking scanning mechanism is installed in front of the entrance of the unit to control the entry of the carrier 104 containing carbon paper and to collect the QR code identity information on each carbon paper.

[0011] Furthermore, the blocking and scanning mechanism includes a blocking cylinder, a sensor, and a barcode scanner. The blocking cylinder is used to intercept or release the vehicle, the sensor is used to determine whether the carbon paper product is present, and the barcode scanner is used to scan the QR code on the carbon paper.

[0012] Furthermore, the carbon paper drying unit 2 consists of a vacuum drying oven, a vacuum pump, a layered storage device, a vacuum pressure detection instrument, a temperature sensor, a humidity sensor, a conveyor belt, a first blocking barcode scanning mechanism 200, and a first PLC controller.

[0013] The carbon paper flattening unit 3 consists of a hot pressing device, a temperature sensor, a pressure sensor, a conveyor belt, a second blocking scanning mechanism 300, and a second PLC controller.

[0014] The first carbon paper heat treatment unit 4 consists of a thermocouple or resistance temperature detector, a temperature sensor, a humidity sensor, a conveyor belt, a third blocking scanning mechanism 400, and a third PLC controller.

[0015] The load coating unit 5 consists of a spraying equipment, a conveyor belt, a fourth blocking barcode scanning mechanism 500, and a fourth PLC controller;

[0016] The second carbon paper heat treatment unit 6 consists of a thermocouple or resistance temperature detector, a temperature sensor, a humidity sensor, a conveyor belt, a fifth blocking barcode scanning mechanism 600, and a fifth PLC controller.

[0017] The visual screening unit 7 consists of a visual industrial control computer, a laser measuring instrument, a conveyor belt, a sixth blocking barcode scanning mechanism 700, and a sixth PLC controller;

[0018] The indicator detection unit 8 includes sheet resistance meter, gas flux meter, contact angle meter, thermal conductivity meter, as well as a conveyor belt, a seventh blocking barcode scanning mechanism 800, and a seventh PLC controller.

[0019] Product packaging unit 9 consists of intelligent tiered storage shelves, intelligent AGV, roller conveyor belt, automatic packaging machine, transport belt, eighth blocking barcode scanning mechanism 900, packaging screening table, non-conforming product branch line 10, and eighth PLC controller.

[0020] Furthermore, the carbon paper production system also includes a transport unit 1, which is used to transport the carrier 104 from the product packaging unit 9 to the product loading position 106.

[0021] Furthermore, the transport unit 1 consists of a carrier return line 100, a carrier separation mechanism 101, a first rotating mechanism 102, a feeding module, a third rotating mechanism 105, and a ninth PLC controller.

[0022] Furthermore, the feeding module includes a second rotating mechanism 103 and a sensor, which are located at the product feeding position 106.

[0023] Furthermore, the data processing unit also includes an application cloud server, a communication connection between the database cloud server and the application cloud server, the application cloud server stores and retrieves data from the database cloud server, and a digital twin virtual system is deployed on the application cloud server.

[0024] Furthermore, the digital twin virtual system includes a digital twin virtual carbon paper drying subsystem, a digital twin virtual carbon paper leveling 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 visual screening subsystem, a digital twin virtual index detection subsystem, a digital twin virtual product packaging subsystem, and a digital twin virtual transportation subsystem.

[0025] The present invention also provides a method for producing carbon paper, comprising the following steps:

[0026] Step S1: Power on the main switch of the production line to initialize the equipment, and simultaneously start the data processing unit and run the digital twin virtual system on the cloud server of the data processing unit application.

[0027] Step S2: The carrier return line 100 of the transport unit 1 will sequentially transport the carrier 104 from the product packaging unit 9 to the product loading position 106. The auxiliary loading robot will place the carbon paper with QR code labels on the carrier 104, and the product will flow to the carbon paper drying unit 2. During this process, the digital twin virtual transport subsystem on the cloud server will synchronously visualize the transport process.

[0028] Step S3: The carrier containing carbon paper continues to flow. The first blocking scanning mechanism 200 of the carbon paper drying unit 2 scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the carbon paper drying unit 2. After the vacuum drying process is completed, the carrier containing carbon paper flows out of the carbon paper drying unit 2. During this process, the digital twin virtual carbon paper drying subsystem on the cloud server synchronously displays the carbon paper drying progress.

[0029] Step S4: The carrier containing carbon paper continues to flow. The second blocking scanning mechanism 300 of the carbon paper flattening unit 3 scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the carbon paper flattening unit 3. After the hot pressing process is completed, the carrier containing carbon paper flows out of the carbon paper flattening unit 3. During this process, the digital twin virtual carbon paper flattening subsystem on the cloud server synchronously displays the technical effect of carbon paper flattening.

[0030] Step S5: The carrier containing carbon paper continues to flow. The third blocking scanning mechanism 400 of the first carbon paper heat treatment unit 4 scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the first carbon paper heat treatment unit 4. After the heat treatment process is completed, the carrier containing carbon paper flows out of the first carbon paper heat treatment unit 4. During this process, the digital twin virtual first carbon paper heat treatment subsystem on the cloud server synchronously displays the carbon paper heat treatment progress.

[0031] Step S6: The carrier containing carbon paper continues to flow. The fourth blocking scanning mechanism 500 of the load coating unit 5 scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the load coating unit 5. After spraying, the carrier containing carbon paper flows out of the load coating unit 5. During this process, the digital twin virtual load coating subsystem on the cloud server synchronously displays the three-dimensional spraying action and the technical effect of the coating.

[0032] Step S7: The carrier containing carbon paper continues to flow. The fifth blocking scanning mechanism 600 of the second carbon paper heat treatment unit 6 scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the second carbon paper heat treatment unit 6. After heat treatment, the carrier containing carbon paper flows out of the second carbon paper heat treatment unit 6. During this process, the digital twin virtual second carbon paper heat treatment subsystem on the cloud server synchronously displays the carbon paper heat treatment progress.

[0033] Step S8: The carrier containing carbon paper continues to flow. The sixth blocking scanning mechanism 700 of the visualization screening unit 7 scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the visualization screening unit 7. After screening, the carrier containing carbon paper flows out of the visualization screening unit 7. During this process, the digital twin virtual visualization screening subsystem on the application cloud server synchronously displays the results of carbon paper screening.

[0034] Step S9: The carrier containing carbon paper continues to flow. The seventh blocking scanning mechanism 800 of the index detection unit 8 scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the index detection unit 8. After detection, the carrier containing carbon paper flows out of the index detection unit 8. During this process, the digital twin virtual index detection subsystem on the cloud server synchronously displays the dynamic detection model of the virtual 3D detection equipment and outputs the index detection results in the SPC analysis report.

[0035] Step S10: The carrier containing carbon paper continues to flow. The eighth blocking barcode 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 scanning, the carrier containing carbon paper enters the packaging screening table of the product packaging unit 9 for screening. The carrier containing unqualified carbon paper goes off the non-qualified product branch line 10, and the carrier containing qualified carbon paper enters the automatic packaging machine. After packaging, the carrier 104 enters the transport unit 1 and returns to step S2, or enters step S11. During this process, the digital twin virtual product packaging subsystem on the cloud server synchronously visualizes the packaging and stacking process.

[0036] Step S11: Production ends.

[0037] Compared with the prior art, the present invention can achieve at least one of the following technical effects:

[0038] (1) The carbon paper production system and method of the present invention divides the manual operation of carbon paper production into ten automated production units connected end to end, which 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.

[0039] (2) The data processing unit of the carbon paper production system of the present invention is equipped with a database cloud server, which can save and upload the data of the day in a timely manner, so that producers can monitor data anomalies in real time; engineers can remotely access and analyze the data in the monitoring room; and managers can also control key indicators such as production schedule and quality of the day.

[0040] (3) The data processing unit of the carbon paper production system of the present invention is equipped with an application cloud server, on which a digital twin virtual system corresponding to each production unit is deployed. The system collects information, guides, starts, responds, and records the production process of the product in a timely and accurate manner, making the entire process of carbon paper production from the start to the end of production visible and digital. This enables a rapid response to changes in the on-site environment and improves the stability, reliability, and controllability of product quality.

[0041] (4) The data processing unit of the carbon paper production system of the present invention is equipped with an application cloud server, which enables wireless access to data at both the near and far ends, making it convenient for operators and managers to understand the operation of the production line and the quality of the products, and to adjust the production schedule in real time.

[0042] (5) Each carbon paper of the present invention is marked with a QR code. The "identity" information data of each carbon paper is stored in the cloud. The relevant permissions can be opened to after-sales technicians, so that the product can be traced after it is circulated in the market. This enables quality control and data traceability throughout the entire product life cycle.

[0043] Other features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0044] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0045] Figure 1 This is a unit layout diagram for a carbon paper production line.

[0046] Figure 2 A diagram of the server architecture for a digital twin virtual system;

[0047] Figure 3 Diagram of the composition of a digital twin virtual system;

[0048] Figure 4 This is a flowchart of the carbon paper production line operation.

[0049] In the diagram: 1-Transportation 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-Non-conforming product branch line; 200-First blocking barcode scanning mechanism; 300-Second blocking barcode scanning mechanism; 400-Third blocking barcode scanning mechanism; 500-Fourth blocking barcode scanning mechanism; 600-Fifth blocking barcode scanning mechanism; 700-Sixth blocking barcode scanning mechanism; 800-Seventh blocking barcode scanning mechanism; 900-Eighth blocking barcode scanning mechanism. Detailed Implementation

[0050] The following detailed description of a carbon paper production system and method, with reference to specific embodiments, is provided. These embodiments are for comparative and illustrative purposes only, and the present invention is not limited to these embodiments.

[0051] A carbon paper production system includes a data processing unit and 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 connected in sequence according to the production process, as well as an auxiliary feeding robot.

[0052] The auxiliary feeding robot is used to place carbon paper into carrier 104 at product feeding position 106 for transportation, with one carbon paper placed in each carrier.

[0053] The data processing unit is used to store the production process and result data of the 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, visualization screening unit 7, index detection unit 8, and product packaging unit 9.

[0054] Specifically, the 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 each independently include a PLC controller, a conveyor belt, and a blocking barcode scanning mechanism.

[0055] Each unit's PLC controller is used to control the equipment within the unit to operate automatically according to the set program. The conveyor belt is used to transport the carriers containing carbon paper in the production process sequence. The blocking and scanning mechanism is installed in front of the entrance of the unit to control the entry of the carrier 104 containing carbon paper and to collect the QR code identification information on each carbon paper. The QR code is the unique identification information of each carbon paper. After production is completed, the production process and quality data of the carbon paper can be obtained by scanning the QR code.

[0056] Specifically, the blocking and scanning mechanism includes a blocking cylinder, a sensor, and a barcode scanner. The blocking cylinder intercepts or allows the carrier containing carbon paper to pass according to the program instructions of the PLC controller in its unit. When the PLC controller program is in standby idle state, the carrier containing carbon paper is allowed to pass; otherwise, the carrier containing carbon paper is intercepted. The sensor is used to determine whether the carbon paper product exists, and the barcode scanner is used to scan the QR code on the carbon paper.

[0057] The data processing unit includes multiple edge servers and a database cloud server. Each PLC controller belonging to the 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, visualization screening unit 7, index detection unit 8, and product packaging unit 9 is connected to an edge server. The edge servers and the database cloud server are connected to each other. The database cloud server is used to store the production process and result data transmitted from the PLC controllers of each unit through the edge servers.

[0058] Specifically, the edge server receives production process and result data from the PLC controllers of each unit and sends the received data to the database cloud server. The edge server has an intelligent data acquisition and control program that facilitates the uploading and downloading of control information between the PLC controllers and the database cloud server. The edge server collects production process data via the OPC protocol and inputs the data into the database cloud server using ETL tools.

[0059] Specifically, carbon paper drying unit 2 is used to dry carbon paper under vacuum conditions. Carbon paper drying unit 2 consists of a vacuum drying chamber, a vacuum pump, a layered storage device, a vacuum pressure detection instrument, a temperature sensor, a humidity sensor, a conveyor belt, a first blocking and scanning mechanism 200, and a first PLC controller. When the carbon paper is transported to the layered storage device inside the vacuum drying chamber, the first PLC controller automatically closes the chamber door and starts the vacuum pump according to the programmed sequence to perform vacuum operation. At this time, the vacuum pressure detection instrument, temperature sensor, and humidity sensor inside the drying chamber begin to operate according to the program.

[0060] Specifically, the carbon paper leveling unit 3 is used to level carbon paper under certain temperature and pressure conditions. The carbon paper leveling unit 3 consists of a hot pressing device, a temperature sensor, a pressure sensor, a conveyor belt, a second blocking scanning mechanism 300, and a second PLC controller. Based on preset system parameters, the second PLC controller operates in real time according to the programmed settings, intelligently adjusting the temperature and pressure within the hot pressing device.

[0061] Specifically, the first carbon paper heat treatment unit 4 is used to heat treat carbon paper according to a predetermined temperature regime. The first carbon paper heat treatment unit 4 consists of thermocouples or resistance thermometers, temperature sensors, humidity sensors, a conveyor belt, a third blocking and 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 door according to the programmed sequence and activates the thermocouples or resistance thermometers to perform the carbon paper heat treatment operation. At this time, the temperature and humidity sensors inside the first carbon paper heat treatment unit 4 begin to operate.

[0062] Specifically, the load coating unit 5 is used to spray a carbon composite slurry onto the surface of carbon paper. The load coating unit 5 consists of a spraying device, a conveyor belt, a fourth blocking and scanning mechanism 500, and a fourth PLC controller. When the carbon paper is transported to the load coating unit, the fourth PLC controller starts the spraying device according to the programmed sequence to perform the load coating operation. This unit sets the load mode, load amount, and other data for the load coating in the spraying device controller, and sends this data to the fourth PLC controller via RS485 serial communication. The fourth PLC controller then controls the three-axis module to complete the uniform spraying.

[0063] 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 applied. The second carbon paper heat treatment unit 6 consists of thermocouples or resistance thermometers, temperature sensors, humidity sensors, a conveyor belt, a fifth blocking and 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 door according to the programmed sequence and starts the thermocouples or resistance thermometers to perform the second heat treatment operation after the thin-film coating is applied. At this time, the temperature and humidity sensors inside the heat treatment unit begin to operate.

[0064] 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 consists of a vision industrial control computer, a laser measuring instrument, a conveyor belt, a sixth blocking barcode scanning mechanism 700, and a sixth PLC controller. When the carbon paper is transported to the visual screening unit, the sixth PLC controller starts the vision industrial control computer and the laser measuring instrument according to the program design. The vision industrial control computer includes a high-definition camera and an automatic image discrimination system. The high-definition camera takes high-frequency pictures of the carbon paper, and the automatic image discrimination system deploys an image recognition algorithm model to segment the carbon paper images, identify and extract feature information that characterizes whether there are defects on the surface of the carbon paper, and finally output the result of whether the product is qualified; and judges whether the flatness of the carbon paper is based on the laser measurement of the flatness.

[0065] Specifically, the index detection unit 8 is used to detect the resistivity, pore size, permeability, contact angle, and thermal conductivity of carbon paper. The index detection unit 8 consists of equipment including a sheet resistance meter, a gas flux meter, a contact angle meter, and a thermal conductivity meter, as well as a conveyor belt, a seventh-block scanning mechanism 800, and a seventh PLC controller. When the carbon paper is transported to the index detection unit, this unit, through the seventh PLC controller, controls the high-precision detection and characterization equipment according to the programmed settings to detect the resistivity, pore size, permeability, contact angle, and thermal conductivity of the carbon paper.

[0066] Specifically, product packaging unit 9 is used to screen and sort qualified and unqualified carbon paper. Unqualified products enter the unqualified product branch line 10, while qualified products are automatically packaged and stored. Product packaging unit 9 consists of intelligent tiered storage shelves, intelligent AGVs, roller conveyors, automatic packaging machines, transport belts, an eighth blocking barcode scanning mechanism 900, a packaging screening table, the unqualified product branch line 10, and an eighth PLC controller. When carbon paper is transported to the product packaging unit, the unit operates according to the programmed instructions via the eighth PLC controller. The packaging screening table classifies qualified and unqualified carbon paper. Unqualified products enter the unqualified product branch line 10, while qualified products enter the automatic packaging machine. After the automatic packaging machine automatically packages the products, production line workers place them on the roller conveyor belt and transport them to the unloading storage area. The intelligent AGV places the packaged carbon paper into the empty spaces on the tiered storage shelves. When the storage area is full, the intelligent tiered storage shelves automatically alarm, reminding operators or intelligent robots to replace the storage shelves.

[0067] In order to enable the automatic recycling of the carrier, a transport unit 1 is set up outside the above-mentioned unit. The transport unit 1 is used to transport the carrier 104 that comes out of the product packaging unit 9 to the product loading position 106.

[0068] Specifically, 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, with one end connected to the product packaging unit 9 and the other end connected to the product loading position 106. The carrier return line 100 is divided into three sections, forming the three sides of the right-angled U-shape. The first rotating mechanism 102 and the third rotating mechanism 105 are located at the 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 side 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 as follows: 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 → feeding module (feeding position 106).

[0069] The carrier operates in the transportation unit 1 according to the program design through the ninth PLC controller. The carrier return line 100 provides the entire line with the return of the carrier 104 that carries the carbon paper, so that it can be reused repeatedly. The form is not limited to belt line, but can also be transported by AGV trolleys, etc.

[0070] Specifically, carrier 104 is a tool for carrying sheet-shaped carbon paper blanks, with one carrier carrying one sheet of carbon paper blank.

[0071] Specifically, the carrier separation mechanism 101 consists of two blocking mechanisms and two sensors for detecting the carriers. The installation distance between the two blocking mechanisms is the length of the carrier. The two sensors are installed in front of the blocking mechanisms to separate the two closely connected carriers, allowing the carriers 104 to enter the production line one by one.

[0072] Specifically, the rotating mechanism consists of a lifting cylinder and a rotating cylinder, used to change the flow direction of the vehicle.

[0073] Specifically, the feeding module includes a second rotating mechanism 103 and a sensor. The second rotating mechanism 103 and the sensor are located at the product feeding position 106. Here, the auxiliary feeding robot places the carbon paper onto the carrier 104 on the second rotating mechanism 103, and then the carrier containing the carbon paper flows to the carbon paper drying unit 2.

[0074] Figure 1 This is a unit layout diagram of a carbon paper production line.

[0075] Furthermore, to process data on the vehicle's operating speed and material loading status in transport unit 1, the data processing unit adds an edge server that communicates with the ninth PLC controller of transport unit 1. The edge server also communicates with a cloud database server, which stores the data on vehicle operating speed and material loading status. Specifically, the edge server is equipped with an intelligent data acquisition and control program. This program transmits control information between the ninth PLC controller and the cloud database server. The edge server collects production process data via the OPC protocol and inputs the data into the cloud database server using an ETL tool.

[0076] To enable remote wireless access to data and facilitate full-process monitoring of the carbon paper production system, allowing operators and managers to understand the production line's operation and automatically monitor carbon paper quality for real-time adjustments to production schedules, the data processing unit also includes an application cloud server. The database cloud server and the application cloud server communicate with each other. The application cloud server stores and retrieves data from the database cloud server, and a digital twin virtual system is deployed on the application cloud server.

[0077] Specifically, a digital twin virtual system is deployed on the application cloud server, corresponding to each of the following units: 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, indicator detection unit 8, and product packaging unit 9. Figure 2 This is a server architecture diagram for a digital twin virtual system.

[0078] Specifically, the digital twin virtual system on the application cloud server consists of virtual subsystems corresponding one-to-one with each unit, including a digital twin virtual carbon paper drying subsystem, a digital twin virtual carbon paper leveling 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 visual screening subsystem, a digital twin virtual index detection subsystem, a digital twin virtual product packaging subsystem, and a digital twin virtual transportation subsystem. Each digital twin virtual subsystem achieves synchronized virtual operation by calling real-time production data stored in the database cloud server. Figure 3 This is a diagram showing the components of a digital twin virtual system.

[0079] The digital twin virtual carbon paper drying subsystem displays the real-time drying progress of the carbon paper based on real-time basic data such as vacuum pressure, drying temperature, and humidity obtained from the database cloud server; the digital twin virtual carbon paper leveling subsystem outputs the stress change curve of the carbon paper, SPC analysis charts, and other technical effects based on real-time temperature and pressure data obtained from the database cloud server; the digital twin virtual first carbon paper heat treatment subsystem displays the heat treatment progress of the carbon paper in real-time based on real-time basic data such as temperature, humidity, and time obtained from the database cloud server; the digital twin virtual load coating subsystem displays the three-dimensional spraying action and the technical effects of the coating in real-time based on real-time data from the spraying equipment controller obtained from the database cloud server; the digital twin virtual second carbon paper heat treatment subsystem displays the drying progress based on real-time data such as temperature, humidity, and time obtained from the database cloud server. The system provides real-time monitoring of carbon paper heat treatment progress using basic data such as temperature, humidity, and time. A digital twin virtual visualization screening subsystem displays the carbon paper screening results based on real-time data from a cloud database server, indicating product qualification. A digital twin virtual indicator detection subsystem displays a dynamic detection model of a virtual 3D detection device based on real-time detection data from a cloud database server and outputs SPC analysis reports. A digital twin virtual product packaging subsystem visualizes the packaging and stacking process synchronously based on real-time packaging data from a cloud database server, providing online remote monitoring for managers and workers. A digital twin virtual transportation subsystem visualizes the transportation process synchronously based on real-time vehicle speed and loading data from a cloud database server, providing online remote monitoring for managers and workers.

[0080] The present invention also provides a method for producing carbon paper, comprising the following steps:

[0081] Step S1: Power on the main switch of the production line to initialize the equipment, and simultaneously start the data processing unit and run the digital twin virtual system on the cloud server of the data processing unit application.

[0082] Step S2: The carrier return line 100 of the transport unit 1 will sequentially transport the carrier 104 from the product packaging unit 9 to the product loading position 106. The auxiliary loading robot will place the carbon paper with QR code labels on the carrier 104, and the product will flow to the carbon paper drying unit 2. During this process, the digital twin virtual transport subsystem on the cloud server will synchronously visualize the transport process.

[0083] Step S3: The carrier containing carbon paper continues to flow. The first blocking scanning mechanism 200 of the carbon paper drying unit 2 scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the carbon paper drying unit 2. After the vacuum drying process is completed, the carrier containing carbon paper flows out of the carbon paper drying unit 2. During this process, the digital twin virtual carbon paper drying subsystem on the cloud server synchronously displays the carbon paper drying progress.

[0084] Step S4: The carrier containing carbon paper continues to flow. The second blocking scanning mechanism 300 of the carbon paper flattening unit 3 scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the carbon paper flattening unit 3. After the hot pressing process is completed, the carrier containing carbon paper flows out of the carbon paper flattening unit 3. During this process, the digital twin virtual carbon paper flattening subsystem on the cloud server synchronously displays the technical effect of carbon paper flattening.

[0085] Step S5: The carrier containing carbon paper continues to flow. The third blocking scanning mechanism 400 of the first carbon paper heat treatment unit 4 scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the first carbon paper heat treatment unit 4. After the heat treatment process is completed, the carrier containing carbon paper flows out of the first carbon paper heat treatment unit 4. During this process, the digital twin virtual first carbon paper heat treatment subsystem on the cloud server synchronously displays the carbon paper heat treatment progress.

[0086] Step S6: The carrier containing carbon paper continues to flow. The fourth blocking scanning mechanism 500 of the load coating unit 5 scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the load coating unit 5. After spraying, the carrier containing carbon paper flows out of the load coating unit 5. During this process, the digital twin virtual load coating subsystem on the cloud server synchronously displays the three-dimensional spraying action and the technical effect of the coating.

[0087] Step S7: The carrier containing carbon paper continues to flow. The fifth blocking scanning mechanism 600 of the second carbon paper heat treatment unit 6 scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the second carbon paper heat treatment unit 6. After heat treatment, the carrier containing carbon paper flows out of the second carbon paper heat treatment unit 6. During this process, the digital twin virtual second carbon paper heat treatment subsystem on the cloud server synchronously displays the carbon paper heat treatment progress.

[0088] Step S8: The carrier containing carbon paper continues to flow. The sixth blocking scanning mechanism 700 of the visualization screening unit 7 scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the visualization screening unit 7. After screening, the carrier containing carbon paper flows out of the visualization screening unit 7. During this process, the digital twin virtual visualization screening subsystem on the application cloud server synchronously displays the results of carbon paper screening.

[0089] Step S9: The carrier containing carbon paper continues to flow. The seventh blocking scanning mechanism 800 of the index detection unit 8 scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the index detection unit 8. After detection, the carrier containing carbon paper flows out of the index detection unit 8. During this process, the digital twin virtual index detection subsystem on the cloud server synchronously displays the dynamic detection model of the virtual 3D detection equipment and outputs the index detection results in the SPC analysis report.

[0090] Step S10: The carrier containing carbon paper continues to flow. The eighth blocking barcode 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 scanning, the carrier containing carbon paper enters the packaging screening table of the product packaging unit 9 for screening. The carrier containing unqualified carbon paper goes off the non-qualified product branch line 10, and the carrier containing qualified carbon paper enters the automatic packaging machine. After packaging, the carrier 104 enters the transport unit 1 and returns to step S2, or enters step S11. During this process, the digital twin virtual product packaging subsystem on the cloud server synchronously visualizes the packaging and stacking process.

[0091] Step S11: Production ends. Exit the digital twin virtual system on the application cloud server, shut down the data processing unit, and turn off the main power supply to the production line.

[0092] Specifically, in step S2, the carrier return line 100 of the transport unit 1 transfers multiple carriers 104 to the carrier separation mechanism 101. The carrier separation mechanism 101 controls the carriers 104 to pass one by one to the first rotating mechanism 102. 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 QR code labels onto the carrier 104. The rotating cylinder of the second rotating mechanism 103... The cylinder rotates the carrier 90 degrees. After the ninth PLC controller of the transportation unit 1 receives the signal from the first PLC controller of the carbon paper drying unit 2 that the material can be discharged, 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, which is connected to the ninth PLC controller, collects real-time data from the ninth PLC controller of the transportation unit 1 and inputs it into the database cloud server. The application cloud server calls the data from the database cloud server, and the digital twin virtual transportation subsystem on the application cloud server synchronously visualizes the transportation process.

[0093] Specifically, in step S3, the carrier containing carbon paper is blocked at the blocking position by the blocking cylinder of the first blocking scanning mechanism 200 of the carbon paper drying unit 2. After the sensor detects the product, the barcode scanner starts scanning the QR code on the carbon paper. After scanning is completed, the first PLC controller of the carbon paper drying unit 2 sends a signal to allow carbon paper feeding, and the first scanning blocking mechanism 200 releases the material. At the same time, the first PLC controller of the carbon paper drying unit 2 sends a signal to the ninth PLC controller of the transport unit 1 to prohibit material discharge, and the carrier containing carbon paper enters the vacuum drying chamber of the carbon paper drying unit 2. After the vacuum drying process is completed, the carbon paper drying unit 2 waits for the material to be received. After receiving the signal from carbon paper leveling unit 3 allowing material discharge, the carrier containing carbon paper flows out of carbon paper drying unit 2. When the program of the first PLC controller of carbon paper drying unit 2 is in standby idle state, it sends a signal to the ninth PLC controller of transport unit 1 allowing material discharge. During this process, the edge server in the data processing unit, which is connected to the first PLC controller, collects the real-time production data in the first PLC controller of carbon paper drying unit 2 and inputs it into the database cloud server. The application cloud server calls the data from 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.

[0094] Specifically, in step S4, the carrier containing carbon paper is blocked at the blocking position by the blocking cylinder of the second blocking scanning mechanism 300 of the carbon paper flattening unit 3. After the sensor detects the product, the barcode scanner starts scanning the QR code on the carbon paper. After scanning is completed, the second PLC controller of the carbon paper flattening unit 3 sends a signal to allow carbon paper feeding, and the second blocking scanning mechanism 300 releases the material. At the same time, the second PLC controller of the carbon paper flattening unit 3 sends a signal to the first PLC controller of the carbon paper drying unit 2 to prohibit material discharge, and the carrier containing carbon paper enters the carbon paper flattening unit 3. After the hot pressing process is completed, the carbon paper flattening unit 3 waits to receive the first carbon paper heat treatment... After the processing unit 4 sends a signal to allow material discharge, the carrier containing carbon paper flows out of the carbon paper leveling unit 3. When the program of the second PLC controller of the carbon paper leveling unit 3 is in standby idle state, it sends a signal to the first PLC controller of the carbon paper drying unit 2 to allow material discharge. During this process, the edge server in the data processing unit, which is connected to the second PLC controller, collects the real-time production data in the second PLC controller of the carbon paper leveling unit 3 and inputs it into the database cloud server. The application cloud server calls the data in the database cloud server, and the digital twin virtual carbon paper leveling subsystem on the application cloud server synchronously displays the technical effect of carbon paper leveling.

[0095] Specifically, in step S5, the carrier containing carbon paper is blocked at 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 detects the product, the barcode scanner starts scanning the QR code on the carbon paper. After scanning is completed, the third PLC controller of the first carbon paper heat treatment unit 4 sends a signal to allow carbon paper feeding, and the third scanning blocking mechanism 400 releases the material. At the same time, the third PLC controller of the first carbon paper heat treatment unit 4 sends a signal to the second PLC controller of the carbon paper flattening unit 3 to prohibit material discharge, and the carrier containing 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 to receive the load. After the coating unit 5 sends a signal to allow material discharge, the carrier containing carbon paper flows out of the first carbon paper heat treatment unit 4. Once the program of the third PLC controller of the first carbon paper heat treatment unit 4 is in standby idle state, a signal to allow material discharge is sent to the second PLC controller of the carbon paper leveling unit 3. During this process, the edge server in the data processing unit, which is connected to 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 from the database cloud server, and the digital twin virtual first carbon paper heat treatment subsystem on the application cloud server synchronously displays the carbon paper heat treatment progress.

[0096] Specifically, in step S6, the carrier containing carbon paper is blocked at a blocking position by the blocking cylinder of the fourth blocking scanning mechanism 500 of the load coating unit 5. After the sensor detects the product, the barcode scanner starts scanning the QR code on the carbon paper. After scanning is completed, the fourth PLC controller of the load coating unit 5 sends a signal to allow carbon paper feeding, and the fourth blocking scanning mechanism 500 releases the material. At the same time, the fourth PLC controller of the load coating unit 5 sends a signal to the third PLC controller of the first carbon paper heat treatment unit 4 to prohibit material discharge, and the carrier containing carbon paper enters the load coating unit 5. After the coating is completed, the load coating unit 5 waits to receive a signal from the second carbon paper heat treatment unit 6. After the signal to allow material discharge is received, the carrier containing carbon paper flows out of the load coating unit 5. The program of the fourth PLC controller of the load coating unit 5 is in standby idle state, and sends a signal to allow material discharge to the third PLC controller of the first carbon paper heat treatment unit 4. During this process, the data processing unit communicates with the edge server connected to the fourth PLC controller to collect real-time production data from the fourth PLC controller of the load coating unit 5, inputs it into the database cloud server, and the application cloud server calls the data from the database cloud server. The digital twin virtual load coating subsystem on the application cloud server synchronously displays the three-dimensional spraying action and the technical effect of the coating.

[0097] Specifically, in step S7, the carrier containing carbon paper is blocked at a blocking position by the blocking cylinder of the fifth blocking scanning mechanism 600 of the second carbon paper heat treatment unit 6. After the sensor detects the product, the barcode scanner starts scanning the QR code on the carbon paper. After scanning, the fifth PLC controller of the second carbon paper heat treatment unit 6 sends a signal to allow carbon paper feeding, and the fifth blocking scanning mechanism 600 releases the material. At the same time, the fifth PLC controller of the second carbon paper heat treatment unit 6 sends a signal to the fourth PLC controller of the load coating unit 5 to prohibit material discharge, and the carrier containing carbon paper enters the second carbon paper heat treatment unit 6. After heat treatment, the second carbon paper heat treatment unit 6 waits for a visual signal. 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. Once the program of the fifth PLC controller of the second carbon paper heat treatment unit 6 is in standby idle state, it sends a signal allowing discharge to the fourth PLC controller of the load coating unit 5. During this process, the edge server in the data processing unit, which is connected to 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 from the database cloud server, and the digital twin virtual second carbon paper heat treatment subsystem on the application cloud server synchronously displays the carbon paper heat treatment progress.

[0098] Specifically, in step S8, the carrier containing carbon paper is blocked at a blocking position by the blocking cylinder of the sixth blocking scanning mechanism 700 of the visual screening unit 7. After the sensor detects the product, the barcode scanner starts scanning the QR code on the carbon paper. After scanning is completed, the sixth PLC controller of the visual screening unit 7 sends a signal to allow carbon paper feeding, and the sixth blocking scanning mechanism 700 releases the material. At the same time, the sixth PLC controller of the visual screening unit 7 sends a signal to the fifth PLC controller of the second carbon paper heat treatment unit 6 to prohibit material discharge, and the carrier containing carbon paper enters the visual screening unit 7. After screening is completed, the visual screening unit 7 waits to receive the indicator inspection. After the signal from the measuring unit 8 permitting discharge is received, the carrier containing carbon paper flows out of the visual screening unit 7. The program of the sixth PLC controller of the visual screening unit 7 is in standby idle state and sends a signal to the fifth PLC controller of the second carbon paper heat treatment unit 6 permitting discharge. During this process, the edge server in the data processing unit, which is connected to the sixth PLC controller, collects real-time data from 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 from the database cloud server, and the digital twin virtual visual screening subsystem on the application cloud server synchronously displays the results of carbon paper screening.

[0099] Specifically, in step S9, the carrier containing carbon paper is blocked at a blocking position by the blocking cylinder of the seventh blocking scanning mechanism 800 of the index detection unit 8. After the sensor detects the product, the barcode scanner starts scanning the QR code on the carbon paper. After scanning, the seventh PLC controller of the index detection unit 8 sends a signal to allow carbon paper feeding, and the seventh blocking scanning mechanism 800 releases the carrier. At the same time, the seventh PLC controller of the index detection unit 8 sends a signal to the sixth PLC controller of the visual screening unit 7 to prohibit material discharge, and the carrier containing carbon paper enters the index detection unit 8. After detection, the index detection unit 8 waits for the signal to allow material discharge from the packaging unit 9 before releasing the carrier containing carbon paper. The carbon paper carrier outflow index detection unit 8, the program of the seventh PLC controller of the index detection unit 8 is in standby idle state, and sends a signal to the sixth PLC controller of the visualization screening unit 7 to allow material discharge; during this process, the edge server in the data processing unit, which is connected to the seventh PLC controller, collects real-time data from the seventh PLC controller of the index detection unit 8, inputs it into the database cloud server, the application cloud server calls the data from the database cloud server, and the digital twin virtual index detection subsystem on the application cloud server synchronously displays the dynamic detection model of the virtual 3D detection equipment, and outputs SPC analysis reports and index detection results.

[0100] Specifically, in step S10, the carrier containing carbon paper is blocked at the blocking position by the blocking cylinder of the eighth blocking scanning mechanism 900 of the packaging unit 9. After the sensor detects the product, the barcode scanner starts scanning the QR code on the carbon paper and determines whether the carbon paper is qualified. After scanning is completed, the eighth blocking scanning mechanism 900 releases the carbon paper after waiting for the eighth PLC controller of the packaging unit 9 to send a signal to allow carbon paper feeding. At the same time, the eighth PLC controller of the packaging unit 9 sends a signal to the seventh PLC controller of the index detection unit 8 to prohibit material discharge. The carrier containing carbon paper enters the packaging screening table of the packaging unit 9 for screening. The carrier containing unqualified carbon paper is removed from the unqualified product branch line 10, and the carrier containing qualified carbon paper is removed from the 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 standby idle state, and sends a signal to the seventh PLC controller of the indicator detection unit 8 to allow material discharge. The carrier 104 enters the carrier return line 100 of the transportation unit 1 and returns to step S2, or enters step S11. During this process, the edge server in the data processing unit, which is connected to the eighth PLC controller, collects real-time data from 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.

[0101] It should be noted that in step S2, the ninth PLC controller of transport unit 1 and the auxiliary loading robot communicate via digital I / O, sending signals to allow loading and to indicate that loading is complete. In steps S2 to S10, the PLC controllers of each unit send signals to the unit of the previous process to allow or prohibit unloading via the standard SMEMA protocol.

[0102] In step S10, after the barcode scanner of the eighth blocking barcode scanning mechanism of the product packaging unit 9 scans the QR code on the carbon paper, the edge server, which is connected to the eighth PLC controller of the product packaging unit 9, obtains the carbon paper QR code. Then, it queries the database cloud server to see whether the carbon paper is qualified in the visualization 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 then filters and sorts the carbon paper on the packaging screening table based on this information.

[0103] Figure 4 This is a flowchart of the carbon paper production line operation.

[0104] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A carbon paper production system, characterized in that, It includes a data processing unit and 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), visualization screening unit (7), index detection unit (8) and product packaging unit (9) connected in sequence according to the production process, as well as an auxiliary feeding robot, which puts the carbon paper into the carrier (104) at the product feeding position (106); The 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) each independently include a PLC controller. The PLC controller of each unit is used to control the equipment in the unit to run automatically according to the set program. The 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), visualization screening unit (7), index detection unit (8) and product packaging unit (9) each independently include a conveyor belt and a blocking scanning mechanism. The conveyor belt is used to transport the carrier according to the production process sequence. The blocking scanning mechanism is installed in front of the entrance of the unit to control the entry of the carrier (104) containing carbon paper and to collect the QR code identity information on each carbon paper. The data processing unit includes multiple edge servers and a database cloud server. The PLC controller of each unit is connected to an edge server. The edge server and the database cloud server are connected to each other. The database cloud server is used to store data. The data processing unit also includes an application cloud server. The database cloud server and the application cloud server are connected in communication. The application cloud server stores and retrieves data from the database cloud server. A digital twin virtual system is deployed on the application cloud server.

2. The carbon paper production system according to claim 1, characterized in that, The blocking and scanning mechanism includes a blocking cylinder, a sensor, and a barcode scanner. The blocking cylinder is used to intercept or allow the vehicle to pass, the sensor is used to determine whether the carbon paper product is present, and the barcode scanner is used to scan the QR code on the carbon paper.

3. The carbon paper production system according to claim 1, characterized in that, The carbon paper drying unit (2) consists of a vacuum drying oven, a vacuum pump, a layered storage device, a vacuum pressure detection instrument, a temperature sensor, a humidity sensor, a conveyor belt, a first blocking scanning mechanism (200), and a first PLC controller; The carbon paper flattening unit (3) consists of a hot pressing device, a temperature sensor, a pressure sensor, a conveyor belt, a second blocking scanning mechanism (300), and a second PLC controller; The first carbon paper heat treatment unit (4) consists of a thermocouple or resistance temperature detector, a temperature sensor, a humidity sensor, a conveyor belt, a third blocking scanning mechanism (400), and a third PLC controller; The load coating unit (5) consists of a spraying device, a conveyor belt, a fourth blocking barcode scanning mechanism (500), and a fourth PLC controller; The second carbon paper heat treatment unit (6) consists of a thermocouple or resistance temperature detector, a temperature sensor, a humidity sensor, a conveyor belt, a fifth blocking scanning mechanism (600), and a fifth PLC controller; The visual screening unit (7) consists of a visual industrial control computer, a laser measuring instrument, a conveyor belt, a sixth blocking barcode scanning mechanism (700), and a sixth PLC controller; The index detection unit (8) includes a sheet resistance meter, a gas flux meter, a contact angle meter, a thermal conductivity meter, as well as a conveyor belt, a seventh blocking barcode scanning mechanism (800), and a seventh PLC controller. The product packaging unit (9) consists of an intelligent layered storage shelf, an intelligent AGV, a roller conveyor belt, an automatic packaging machine, a transport belt, an eighth blocking barcode scanning mechanism (900), a packaging screening table, a non-conforming product branch line (10), and an eighth PLC controller.

4. The carbon paper production system according to claim 1, characterized in that, The carbon paper production system also includes a transport unit (1) for transporting the carrier (104) from the product packaging unit (9) to the product loading position (106).

5. The carbon paper production system according to claim 4, characterized in that, The transport unit (1) consists of a carrier return line (100), a carrier separation mechanism (101), a first rotating mechanism (102), a feeding module, a third rotating mechanism (105), and a ninth PLC controller.

6. The carbon paper production system according to claim 5, characterized in that, The feeding module includes a second rotating mechanism (103) and a sensor, which are located at the product feeding position (106).

7. The carbon paper production system according to claim 1, characterized in that, The digital twin virtual system includes a digital twin virtual carbon paper drying subsystem, a digital twin virtual carbon paper leveling 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 visual screening subsystem, a digital twin virtual index detection subsystem, a digital twin virtual product packaging subsystem, and a digital twin virtual transportation subsystem.

8. A method for producing carbon paper, characterized in that, The carbon paper production system according to claim 7 includes the following steps: Step S1: Power on the main switch of the production line to initialize the equipment, and simultaneously start the data processing unit and run the digital twin virtual system on the cloud server of the data processing unit application. Step S2: The carrier return line (100) of the transport unit (1) will sequentially transport the carrier (104) that comes out of the product packaging unit (9) to the product loading position (106). The auxiliary loading robot will place the carbon paper with QR code labels on the carrier (104), and the product will flow to the carbon paper drying unit (2). During this process, the digital twin virtual transport subsystem on the cloud server will be used to visualize the transport process in real time. Step S3: The carrier containing carbon paper continues to flow. The first blocking scanning mechanism (200) of the carbon paper drying unit (2) scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the carbon paper drying unit (2). After the vacuum drying process is completed, the carrier containing carbon paper flows out of the carbon paper drying unit (2). During this process, the digital twin virtual carbon paper drying subsystem on the cloud server synchronously displays the carbon paper drying progress. Step S4: The carrier containing carbon paper continues to flow. The second blocking scanning mechanism (300) of the carbon paper flattening unit (3) scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the carbon paper flattening unit (3). After the hot pressing process is completed, the carrier containing carbon paper flows out of the carbon paper flattening unit (3). During this process, the digital twin virtual carbon paper flattening subsystem on the cloud server synchronously displays the technical effect of carbon paper flattening. Step S5: The carrier containing carbon paper continues to flow. The third blocking scanning mechanism (400) of the first carbon paper heat treatment unit (4) scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the first carbon paper heat treatment unit (4). After the heat treatment process is completed, the carrier containing carbon paper flows out of the first carbon paper heat treatment unit (4). During this process, the digital twin virtual first carbon paper heat treatment subsystem on the cloud server synchronously displays the carbon paper heat treatment progress. Step S6: The carrier containing carbon paper continues to flow. The fourth blocking scanning mechanism (500) of the load coating unit (5) scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the load coating unit (5). After spraying, the carrier containing carbon paper flows out of the load coating unit (5). During this process, the digital twin virtual load coating subsystem on the cloud server synchronously displays the three-dimensional spraying action and the technical effect of the coating. Step S7: The carrier containing carbon paper continues to flow. The fifth blocking scanning mechanism (600) of the second carbon paper heat treatment unit (6) scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the second carbon paper heat treatment unit (6). After heat treatment, the carrier containing carbon paper flows out of the second carbon paper heat treatment unit (6). During this process, the digital twin virtual second carbon paper heat treatment subsystem on the cloud server synchronously displays the carbon paper heat treatment progress. Step S8: The carrier containing carbon paper continues to flow. The sixth blocking scanning mechanism (700) of the visualization screening unit (7) scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the visualization screening unit (7). After screening, the carrier containing carbon paper flows out of the visualization screening unit (7). During this process, the digital twin virtual visualization screening subsystem on the application cloud server synchronously displays the results of carbon paper screening. Step S9: The carrier containing carbon paper continues to flow. The seventh blocking scanning mechanism (800) of the index detection unit (8) scans the QR code on the carbon paper. After scanning, the carrier containing carbon paper enters the index detection unit (8). After detection, the carrier containing carbon paper flows out of the index detection unit (8). During this process, the digital twin virtual index detection subsystem on the cloud server synchronously displays the dynamic detection model of the virtual 3D detection equipment and outputs the SPC analysis report index detection results. Step S10: The carrier containing carbon paper continues to flow. The eighth blocking barcode 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 scanning, the carrier containing carbon paper enters the packaging screening table of the product packaging unit (9) for screening. The carrier containing unqualified carbon paper goes off the non-qualified product branch line (10), and the carrier containing qualified carbon paper enters the automatic packaging machine. After packaging, the carrier (104) enters the transportation unit (1) and returns to step S2, or enters step S11. During this process, the digital twin virtual product packaging subsystem on the cloud server is used to synchronously visualize the packaging and stacking process. Step S11: Production ends.

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