After the modification of the laminating machine, the stability and followability of the system have been greatly improved, the problems of reverse osmosis membrane jitter and scratches have been completely resolved, and the product quality has been greatly improved. The composite reverse osmosis membrane is a new type of polymer material, and the membrane laminator is the key production equipment. There are many problems with the electrical control system of the imported laminator, which cannot guarantee the quality of the product. The overall scheme design for the transformation of the electrical control system of the laminator. The PLC with simple programming and easy maintenance is used to replace the industrial computer, and the inverter is used to replace the imported DC speed regulating device with poor reliability. Only when the tension of each section of the reverse osmosis membrane is kept constant during the operation of the equipment can the quality of the reverse osmosis membrane be ensured.

        The control system uses a touch screen as the man-machine interface. The screen of the man-machine interface makes the operation more intuitive and convenient. According to the prompts of the man-machine interface, the problems in the system can be quickly found. The unwinding adopts tension feedback and magnetic powder clutch control, which has a good tension following effect, and the tension will not change with the change of the roll diameter. The intermediate traction motor uses constant tension control, and the motor that provides the reference speed uses speed closed-loop feedback. The encoder and the high-speed counter of the PLC are used to measure the speed feedback value, and the PID calculation is implemented by the PLC. The tension of the middle section adopts a scheme combining feedforward control and tension feedback control. The feedforward part output by the controller is proportional to the reference speed, and the feedback part is provided by the tension PID controller.