Analysis Of Tension Control System Of Slitting Machine
Performance and characteristics of thin film slitting machine:
After printing, the aluminum foil needs to be cut on the slitting machine after being printed and coated. Cutting large volume semi-finished products into the required size, the cutting machine on the cutting of semi-finished products is a unwinding and rewinding process, this process includes the machine running speed control and tension control two parts. The so-called tension is to traction aluminum foil and the standard roll to the core, the aluminum foil must be applied to a certain stretch and tensioning of the traction Force, wherein the tension of the aluminum foil control. Tension control is the ability to permanently control the tension of the aluminum foil on the device, which must be kept effective for any operating speed, including acceleration, deceleration and constant velocity of the machine. Even in the case of an emergency shutdown, it has the ability to ensure that the foil does not produce any breakage. Slitting machine Tension control is basically manual tension control, automatic tension control. Manual tension control is in the process of rewinding or unwinding, when the roll diameter changes to a certain stage, by the operator to adjust the manual power supply device, so as to achieve the purpose of control tension. The automatic tension control is the actual tension value of the material belt directly by the tension sensor, then the tension data is transformed into a tension signal feedback back-tension controller, which is compared with the preset tension value of the controller to calculate the control signal and the automatic control unit, so that the actual tension value is equal to the pre-set tension value, in order to achieve the stability tension. Equipment rewinding and unwinding tension set the size of direct impact on product yield, tension too large, rewinding too tight, aluminum foil easy to produce wrinkles I tension is not enough, aluminum foil easily on the roll to create a serious dislocation on the shaft, so that it can not be unloaded, and resulting in cutting the reel produced a large swing, affecting the quality of slitting, so the slitter must have a good tension detection system.
1. Slitting machine Unwinding tension detection system: Tension sensor detection It is the tension of direct detection, and mechanical closely together, with moving parts detection method. Typically, two sensors are paired for use, and they are mounted on the end shafts on either side of the guide rollers. The material belt detects the actual tension value by detecting the load exerted on both sides of the guide rollers, so as to detect the displacement or deformation of the tension sensor, and convert the tension data into the tension signal to feedback to the tension controller.
2. Slitting machine unwinding tension attenuation and tension compensation: generally believed that aluminum foil unwinding and rewinding to maintain constant aluminum foil tension, is conducive to the performance of aluminum foil quality, but not. The best way to do this is to increase the tensile strength of the foil according to a certain law with the increase of the diameter or weight of the material roll, and the decrease of the tension value of the smaller diameter weight. Because of the automatic tension control and manual tension control in the slitting operation.
The automatic tension control system is a preset tension attenuation value, which is attenuated according to the change of material volume during operation. When setting the automatic tension operation, first set the initial tension, then set the tension attenuation value. Taking the attenuation value of the cut aluminum foil as an example, the setting principle is: the tensile attenuation value of aluminum foil (%) equals the tension of the end winding of the aluminum foil, minus the initial tension and then dividing the initial tension, the quotient is multiplied by 100%. In setting the automatic tension value should not be too large, or aluminum foil rewinding surface hardness, prone to warping phenomenon, but the tension is not too small, too small easy to cause rewinding volume is too loose, rewinding irregular running edge. Therefore, the quality of the roll control system is the key to the quality of the aluminum foil, which is mainly affected by the change of the tension of the foil.
To sum up, in cutting medicinal foil, first of all to choose advanced models, and note that in the operation of the device to understand the characteristics of the tension detection and control system, the use of aluminum foil material to establish a reasonable tension and unwinding process tension attenuation and compensation, in order to achieve the soft start of equipment tension, soft stop, to prevent the production of quality problems. In the cutting operation process should pay attention to the change of the tension of aluminum foil roll, because it is affected by the material quality, weight, thickness uniformity, cutting speed changes, in setting the tension of unwinding and rewinding must be compatible with these characteristics of aluminum foil. In order to ensure the accuracy of the tension of unwinding and rewinding, the tension testing roller should be higher than the maximum speed, and the dynamic balance should be handled, and the surface should be provided with enough angle to provide accurate operation tension to ensure the stability of product quality.