Advanced method for producing a roller-coating color steel plate with multicolored patterns

An advanced method for producing a roller-coating color steel plate with multicolored patterns, comprising in sequence the following process steps of

• A. preparing a steel strip to be printed;
• B. performing a pre-processing on the steel strip to be printed;
• C. using a first roller coating unit to perform a first roller coating transfer on the steel strip to be printed;
• D. using a second roller coating unit to perform a second roller coating transfer on the steel strip to be printed after a preset time;
• E. performing a post-processing to spray the steel strip with gloss paint;
• wherein,
• in the step C, a servo control system is used to control the first roller coating unit, and the servo control system has the following control process of
• S1. inputting data of diameter of each roller and a process speed of the first roller coating unit into a PLC control module, then calculating out theoretical roller surface linear velocity of each roller by the PLC control module according to the process speed and the diameter of each roller, allowing the theoretical roller surface linear velocity of each roller to be consistent with the process speed, and outputting the calculated theoretical roll surface linear velocity signal of each roller into a servo control module having an encoder;
• S2. receiving the theoretical roll surface linear velocity signal of each roller by the servo control module from the PLC control module and driving each roller according to the theoretical roll surface linear velocity signal;
• S3. collecting actual roller surface linear velocity of each roller by the encoder and outputting the actual roller surface linear velocity signal of each roller into the PLC control module;
• S4. according to the received actual roller surface linear velocity signal and theoretical roller surface linear velocity signal of each roller, adjusting current frequency of electrical machine for driving each roller and adjusting the actual roller surface linear velocity of each roller to be consistent with the theoretical roller surface linear velocity of each roller by the PLC control module, thereby completing the roller coating transfer of the first roller coating unit;
• the first roller coating transfer and the second roller coating transfer are respectively used to print patterns on the steel strip to be printed;
• in the sub-step S1 of step C, data of distance between the first roller coating unit and the second roller coating unit is input into the PLC control module, and on the basis of the process speed and the data of distance, the PLC control module calculates out a time to start the second roller coating unit, and starts the second roller coating unit according to the time, and then the second roller coating transfer of the second roller coating unit is completed;
• after the sub-step S4 of step C, the printed patterns are collected by a code recognition module, and a pattern misplacement distance is determined by computer recognition, and then the process speed of the corresponding roller coating unit is revised.