Auto Slitting and Cutting Machine for EPE Foam Sheet/film tension is the force that is tightened in the process of traction and rewinding of plastic Auto Slitting and Cutting Machine for EPE Foam Sheet/film . Tension control is the most widely used technology in the production and processing of thin Auto Slitting and Cutting Machine for EPE Foam Sheet/film s, which involves the tension control problem in the process of production, biaxial stretching, longitudinal stretching, slitting of thin Auto Slitting and Cutting Machine for EPE Foam Sheet/film s, rewinding and laminating of thin Auto Slitting and Cutting Machine for EPE Foam Sheet/film s. Tension control of the good or bad, directly affect the production efficiency of the product and the quality of the pros and cons, if the tension is insufficient, the Auto Slitting and Cutting Machine for EPE Foam Sheet/film in the operation of the drift, will appear after the finished product wrinkle phenomenon; If the tension is too large, the Auto Slitting and Cutting Machine for EPE Foam Sheet/film is easily deformed or even pulled off. This paper will introduce the reasons of tension control and the control way for reference.
Fluctuation of Auto Slitting and Cutting Machine for EPE Foam Sheet/film tension control and its cause
In the process of thin Auto Slitting and Cutting Machine for EPE Foam Sheet/film production and processing, the factors of tension and change are often complicated, and the main influencing factors are as follows:
The manufacturing precision and assembly accuracy of the main components of Shan thin Auto Slitting and Cutting Machine for EPE Foam Sheet/film processing equipment, such as base, wall plate, traction roller and guide roller, are biased. For example, the flatness and straightness of the base assembly, the vertical degree of the wall panel and the base assembly, as well as the rollers. The horizontal degree of the Guide Roller assembly and the parallelism between them are very strict, but for various reasons, there are always different degrees of error. In addition, each roll of the run-out of the deviation, the quality of static and dynamic balance of deviation, the operation, will cause the tension on the Auto Slitting and Cutting Machine for EPE Foam Sheet/film will be small changes. Eventually it will be reflected in the whole production line, causing the tension to produce irregular changes.
Shan transmission system of the gear, reducer because of the lack of clearance precision transmission, the power drive and control system of its rollers because of the specifications, size, model, will cause the transmission synchronization error, these will make the production line of the tension of the changes.
In the process of Shan coiling, the diameter of rewinding is changing and the change of the diameter of the Auto Slitting and Cutting Machine for EPE Foam Sheet/film will inevitably result in the change of tension. When rewinding, if the rewinding torque is unchanged, the tension will decrease as the rewinding diameter increases.
Shan the properties of the thin Auto Slitting and Cutting Machine for EPE Foam Sheet/film material itself. such as the elastic modulus of thin Auto Slitting and Cutting Machine for EPE Foam Sheet/film fluctuations, material thickness, width, length direction changes will also affect the tension change.
Shan in the Auto Slitting and Cutting Machine for EPE Foam Sheet/film processing in the presence of automatic volume-changing process, roll and broken Auto Slitting and Cutting Machine for EPE Foam Sheet/film will make the original stable tension of the whole machine suddenly produce interference changes. The higher the speed of the equipment, the greater the interference.
Shan Auto Slitting and Cutting Machine for EPE Foam Sheet/film surrounding environment, such as production environment temperature, temperature change, air humidity, will have a subtle effect on the tension fluctuation of the whole machine.
The method of tension control
Thus, in order to obtain good rewinding effect, the tension must be effectively controlled, and at present in mechanical design, the common tension control methods and characteristics are as follows:
Magnetic powder brake/magnetic powder clutch tension control
Working principle is the use of magnetic powder clutch control input roll of the rotation torque, that is, by tension detector to directly determine the tension of the roll, and then the tension data after processing to automatically adjust the magnetic powder clutch or brake of the exciting current to control the tension.
This kind of equipment is simple, the price is cheap, can turn forward and backward, suitable for the occasion that the tension precision request is not high. However, the following problems exist in this form of control:
Shan adjustment speed is not fast, it is difficult to apply on high speed machine;
The Shan tension control accuracy is not high, the linearity is not good enough, the control volume diameter change range is small;
The tension sections of Shan flow-extension production line are independent of each other, which is difficult to realize automatic control.
The Shan magnetic powder clutch has the problems of heating and abrasion, and the maintenance is difficult.
Floating Roll Tension control mode
The floating Roll Tension control mode consists of a tension controller, an air pressure control and a cylinder, a swinging rod. Floating roller potentiometer, floating roller, traction motor and speed regulator, brake and clutch. It is an indirect method of tension detection, in fact, a position control. The working principle is that when tension is stable, the tension on the Auto Slitting and Cutting Machine for EPE Foam Sheet/film is balanced with the force of the cylinder, so that the floating roller is in the central position. When the tension changes, the tension and the cylinder force balance is destroyed, the floating roll position will rise or fall, at this time the pendulum rod will be around the cylinder shaft at the top of the pin axis to rotate and drive the floating roller potentiometers together. In this way, the floating roller potentiometer accurately detects the change of the position of the floating roller, it will feed the position signal to the tension controller, the controller calculates and outputs the control signal, and controls the traction motor drive system to rectify the deviation. Then the float rolls back to its original equilibrium position.
As the floating roll tension detecting device is a kind of energy storage structure, it has good absorbing buffering effect on the wide range tension jump, and can also weaken the eccentricity (ellipse) and the effect of velocity change on the tension of the material coil. Due to the influence of the floating roll weight and structure, it can not be used in the control of low tension and variable tension. Floating roll Tension control scheme is a kind of transmission electrostatic tension control scheme, because of its low cost, easy to make, so it is widely used in China. However, the floating roll type tension control scheme also has some weaknesses, such as floating roll tension is achieved by adjusting the air pressure to the practical, easy to air source pressure, floating roll weight, the adjustment of human factors such as the impact. And in the case of small tension (such as less than 1KG tension PE Auto Slitting and Cutting Machine for EPE Foam Sheet/film ) and tension, etc., the use of poor results.