In what industry is the deviation correction controller servo all-in-one machine suitable for?

Servo deviation correction machine is used in printing and packaging machine, textile machinery, rubber machinery, battery machine and other related manufacturing industries. In the production process of bidirectional stretched plastic films, the deviation correction control system greatly reduces the probability of problems such as horizontal pull-off, folds, film rupture, corrugation and jitter, and realizes high-speed and efficient production of films. Combining the application of domestic and foreign deviation correction control systems, we use the working principle and the application examples of the deviation correction system in two-way stretching equipment:

The EPC device is installed at the TDO inlet of the film production line to accurately track the position of the film edge. Its working principle can be simplified to a closed-loop control loop: the starting point of the automatic bias correction machine is to pull the current position of the inlet film horizontally, and one or more sensors scan the current position of the film and transmit it to the controller; the controller compares the measured actual position and the set position. If there is a deviation between the two, the controller will transmit a correction signal to the driver; the driver quickly drives the track of the TDO inlet so that it can track the upper film edge in time. With this cycle, the EPC system keeps driving the tracks to reciprocate, so that there is no clamping phenomenon.

Structure and classification

According to the different power devices of EPC system, it can generally be divided into four categories: electromechanical, electro-hydraulic, pneumatic hydraulic and magnetic. It mainly consists of three parts: sensor, controller, and electromechanical drive. It mainly consists of five parts: sensors, controllers, electro-hydraulic servo valves, electro-hydraulic power devices, and hydraulic drives. It mainly consists of four parts: sensor, pneumatic hydraulic servo valve, pneumatic hydraulic power device, and hydraulic drive. The magnetic EPC system is still in the test stage, mainly used by Bruckner, Germany. There is still a lack of relevant information in China. At present, the above three types are mainly used in the two-way stretched plastic film production lines at home and abroad. The structures of these three control systems are similar, and they all contain sensors. They can be divided into infrared sensors, reflective infrared sensors, ultrasonic sensors, digital sensors, pneumatic sensors, laser sensors, and imaging sensors. Among them, electromechanical and electro-hydraulic sensors are mainly used in infrared sensors and ultrasonic sensors. The electromechanical and electro-hydraulic EPC systems also have a controller. This type of controller is simple to operate and powerful. It has extremely high dynamic response level and detection accuracy during high-speed film production. It can not only monitor in real time, but also achieve remote control.

Electromechanical EPC drive mainly relies on electric push rods, which are simple in equipment, have small backlash and are maintenance-free; it is directly driven by the controller, so it has the most sensitive dynamic response performance, and its typical accuracy error is less than 0.002s. However, such push rods are mainly driven by belts, screws or gears. In the case of assembly errors, long-term wear, etc., their service life is not as good as pneumatic hydraulic and electro-hydraulic EPC systems. The pneumatic hydraulic EPC system mainly relies on the pneumatic hydraulic servo valve to control the oil cylinder drive, and its biggest feature is its smooth operation. Unlike electromechanical EPC drive, it tracks the edge membrane position through a pneumatic sensor, and directly feeds the detected pneumatic pressure signal to the pneumatic hydraulic servo valve. Because the film is a distance from the gas source port, the dynamic response accuracy is not as good as that of the electromechanical control method. Furthermore, the hydraulic oil used will block the oil circuit when contaminated by impurities, so the maintenance frequency is relatively high. The electro-hydraulic EPC system combines the advantages of these two control methods, uses infrared or ultrasonic sensors to achieve accurate detection, and feeds the signal back to the electro-hydraulic servo valve through the controller to achieve precise control of the controller. Not only does it avoid the disadvantage of insufficient dynamic response level of the pneumatic sensor, it also retains the advantages of smooth operation of pneumatic hydraulics, but also has oil circuit impurities problems.