1 Introduction
The biaxially oriented film production line is a large-scale complete set of equipment in the production machinery of plastic products. This kind of equipment relied on imports in the early days of China. With the rapid development of domestic industrial automation, domestic enterprises have developed a film drawing production line with an annual output of 6,000 tons and a film thickness of 12 to 70 microns. The main processes of the biaxially oriented film production line include feeding, die, extruder system, longitudinal stretching system, transverse stretching system and traction winding system. This article mainly introduces the traction winding system. Traction rewinding is the core part of electrical control, and its control is directly related to the quality of the membrane.
2 Lenze Solution
In the migration winding system, there are two servo motors to control the two axes A and B to take turns to wind, and the film tension should always be kept constant or with the increase of the roll diameter during the winding process, and the film tension decreases according to a certain law, that is, the tension taper is controlled. It is also necessary to ensure that the roll is automatically changed after the roll is spread, and when the film is cut off during the roll changing process, it should smoothly transition to the standby winding roller, and between the winding roll and the standby winding roll, the conversion of tension control and speed control is automatically completed. The winding and tightening roller adopts two working methods: contact winding and gap winding, but it is necessary to ensure that with the increase of the roll diameter, the follower roller can automatically retreat. When touching the winding, make sure that the pressure of the follower roller is constant and adjustable.
3 Lenze main algorithms
(1) Coiling diameter calculation: In the winding process, the coil diameter is constantly and gradually increasing, in order to ensure the linear speed and constant tension of the film, it is necessary to use the coil diameter calculation to match the linear speed and the motor speed. The calculated coil diameter is then applied to the set value of the tension, and the calculated resistance torque is superimposed on the torque setting according to the increase of the rotation diameter.
(2) Taper calculation: According to the different materials and process requirements, the taper curve is different on different occasions. Lenze offers three taper curve modes: Straight Mode, Curve Mode, and Custom Mode. There are a variety of parameters to set, among which the custom mode customers can set 64 points to describe the automatic sense curve, which basically meets the use of all occasions. The taper curve of the curve mode is shown in the following figure, D0 is the taper start point, and HW is the taper setting value.
(3) Friction compensation: Friction mainly acts on the transmission device and guide rail. In particular, the force required for start-up and acceleration and deceleration is much greater than that required for normal operation, so that when starting or accelerating and decelerating, there will be greater follow-up error friction, which seriously affects the speed accuracy of the servo system. Compensating for friction is to use various control methods to suppress or eliminate the influence of friction on system performance according to the form and nature of friction. The 9400HL comes with a friction compensation function block L_WndFrictionCompensation automatically identifies the system's coefficient of friction.
(4) Transmission inertia identification: The moment of inertia is a measure of the inertia (the rotating object maintains its uniform circular motion or stationary characteristics) when the rigid body rotates around the axis, and its magnitude depends on the shape of the object, the mass distribution and the position of the rotating shaft. In the rewinding and unwinding application, the moment of inertia for empty rolls and the moment of inertia for full rolls are calculated separately. The 9400HL servo controller can automatically identify the moment of inertia through the L_WndIdentMInertia of off-the-shelf function blocks, reducing tedious calculations for engineers.
4 Lenze Program Highlights
1) 9400HL is very mature in the application of rewinding and unwinding, there are ready-made templates to use, customers only need to modify a few parameters to achieve the function of rewinding and unwinding. The templates are feature-rich, and some of them can be cut off or put in at any time.
2) The 9400HL is a freely programmable servo controller, which can be customized for each project using Lenze Engineer software with a rich visual programming of function blocks.
3) 9400HL can have up to three tasks to execute at the same time, the fastest execution cycle is 1ms, its programming function is no less than a small PLC, in many occasions can save PLC, that is, reduce the cost and reduce the point of failure.
4) The 9400HL is available in a variety of communication forms, including CANOpen, ProfiBus, ProfiNet, EtherNet, EtherCAT, etc. It can communicate with most PLCs and touch screen products in the world, and it is open to a wide range of people.
5 Outlook
The 9400 HL has been used in a wide range of applications, including packaging, textiles, plastics, printing, and more. The 9400 HL rewinding and unwinding template is mainly used in the field of high-precision control, with fast running speed, high precision control, flexibility and reliability. With the improvement of China's manufacturing level, there will be more and more such applications.
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