Application of "Sen Chuang" Servo in Tobacco Packaging Equipment
At present, in China's tobacco industry, high-end, high-speed cigarette packaging equipment is basically imported, because its technology is relatively mature, and is well received by the industry. However, because it basically uses mechanical transmission, with the continuous improvement of anti-counterfeiting requirements, some functions can no longer meet the demand, so the transformation and upgrade is imminent. Color film positioning packaging system is based on this situation, it uses the "Sen Chuang" servo motor, high-performance motion controller and touch screen, so that the pattern on the color film and the pattern on the cigarette box are precisely overlapped, greatly improving The anti-counterfeiting performance, the following describes the application of the system in detail. 1. The basic principle is to track the position of the spindle through the encoder, control the servo motor to strictly follow the spindle, and the spindle rotates one turn. The servo motor drives the packaging film to advance by a fixed length. When the color code is detected, the current spindle encoder position is cached through high-speed input, and The set value is compared, and the servo motor is adjusted so that the film color mark is detected exactly at the set position, so as to achieve the precise overlapping of the film pattern and the cigarette box pattern. 2. Difficulties in control First of all, the installation of the encoder should be completely synchronized with the spindle, and try to be concentric, to prevent the jump of the encoder reading. In order to improve the accuracy, the number of encoder lines is high, so the controller needs to have enough input frequency. The accuracy of the servo motor is very important. Here, the “Sen Chuang” 1.5KW, low-speed, high-torque, high-precision servo motor is used, which has good rigidity and high tracking accuracy. The color-coded sensor uses a fiber-optic sensor with high sensitivity and good reliability. When the controller detects the color code, the hardware buffer is used to record the current encoder value with high precision and is not affected by the program execution delay. A set of packaging equipment is required to package the cigarette case and the tobacco rod at the same time, so one controller has two encoders, two sets of servos and two pairs of optical fiber sensors, and the program is complicated. At the same time, there are a variety of working mode switching, such as transparent film packaging, color film positioning packaging, continuous tracking, intermittent tracking, high requirements for program rationality and execution efficiency. 3. Advantages of transformation After the transformation, not only the original transparent film packaging function is easily realized, but also the color film packaging function is added, and the technical content of the product is improved. By simply modifying the parameters and changing the working mode, it can correspond to a rich product line, and more practical functions such as paper length self-test. After the actual use, the effect is good, and has been recognized and praised by the manufacturers.
