Medicinal aluminum foil printing coating tension detection control method

1.1 Stand-type counter roller sensor tension detection control device: In the unwinding tension control system of aluminum foil printing and coating machine, it mainly consists of electromagnetic speed control motor, magnetic powder tension traction brake and guide roller sensor detection, and is controlled by the central control unit. Constitute points and proportional control. The seat type guide roller sensor tension detection device is shown in FIG. 1 .

The advantage of this type of tension detection is that the structure is simple and easy to install, but the disadvantage is due to the manufacturing precision of the device. When the aluminum foil is accidentally caused to shake, the sensor mistakenly believes that when the tension suddenly changes, the tension will be wrongly controlled. Unstable foil tension.

1.2 floating roller tension detection control device: as shown in Figure 2. The principle of tension detection is as follows: roller 3 is a floating roller, and 1 and 2 are guide rollers. Aluminum foil moves in the direction of the figure. Roll 1 rotates at a constant speed (corresponding to the movement speed of aluminum foil). Roll 3 rotates along with gravity. The line floats and there is no relative sliding between the aluminum foil and the roller surface. The aluminum foil between roller 2 and roller 3 is 4, the aluminum foil between roller 1 and roller 3 is 5, and the aluminum foil between 4 and 5 is parallel to each other and perpendicular to the horizontal plane. When the tension suddenly increases, the increase in tension causes a decrease in the rotation speed of the roller 3 and causes the roller 3 to float upward. The decrease in the rotation speed of the roller 3 causes the tension to increase, and the roller 3 floats, resulting in a tension of 5 degrees. Decrease, the effect of the two on the 5 tension is just the opposite, and vice versa.

The rate at which the speed of rotation of the roller 3 increases or decreases is proportional to the magnitude of its moment of inertia. The acceleration value of the roller 3 floating up or down is proportional to the magnitude of its inertial mass. Therefore, properly selecting the moment of inertia and the inertial mass of the roller 3 can minimize the influence of the jitter of 4 tension on the 5 tension, which is the floating roller. Deflection of aluminum foil tension disturbance inertia.

Due to the change of tension, the position of the floating roller is caused to change. After the detection device connected with the floating roller detects this signal, it feeds back to the tension control system and uses the magnetic powder brake magnetic powder clutch so that the floating roller is always in the movable range. The center position maintains tension stability.

1.3 Cylinder Control Roller Type Tension Detection Control Device: The guide roller 12 is fixed. When the tension is stable, the tension of the aluminum foil and the force of the cylinder make the guide roller 3 in the middle position. When the tension changes, the tension of the guide roller 3 in the aluminum foil and The cylinder force oscillates through the center of the gear 1 through the swing rod. The swing of the guide roller can not only obviously reflect the change of the aluminum foil tension and heat, but also can partially stabilize the tension by changing the length of the aluminum foil, especially eliminating the The poor precision of equipment manufacturing has caused the foil to be tampered with and mistakenly believed that the tension has changed greatly. The gear 1 and the pendulum rod are fixed together to drive the gear 2 to rotate. The gear 2 is connected to a potentiometer, which controls the speed of the electromagnetic speed regulating motor. , reach the stable state of tension.

According to the principle of the above three kinds of aluminum foil tension control methods, it can be seen that the control method of the pedestal type guide wheel sensor is limited to the displacement of the sensor and is only applicable to the printing material with less distortion, and the best tension control system The configuration is to control the roll-type tension detection device controlled by the unwinding output and rewinding cylinder or to control the floating roller by the moving configuration.

1.4 Principles for Setting the Automatic Tensile Attenuation Value of Aluminum Foil: The automatic tension control and manual tension control are used for the tension control during the operation of the aluminum foil printing and coating machine. The automatic tension control system is a preset tension attenuation value, and the device maintains the tension value throughout the operation; the manual tension control requires the operator to continuously adjust according to the specific conditions of the weight of the equipment and materials, so as to meet the material requirements during operation. Needed tension.

When setting the automatic tension operation, you should set the initial tension first, and then set the tension attenuation value. Take the winding tension attenuation value as an example. The principle of setting is: the attenuation value (%) is equal to the tension reduction of the end of the aluminum foil winding. After the initial tension is removed and then divided by the initial tension, the resulting quotient is multiplied by 100%. When setting the automatic tension value of the winding, it should be noted that the setting value of the tension should not be too large, or the hardness of the aluminum foil winding is large, and the edge curling phenomenon easily occurs. However, the tension is too small, the rewinding body is too loose, and the winding is not easy to run.