Slitting machine is a kind of mechanical equipment that cuts wide paper or film into multiple narrow materials, and is often used in papermaking machinery and printing and packaging machinery. The traditional control scheme of the slitting machine is to use a large motor to drive the shaft of the rewinding and unwinding, and a magnetic powder clutch is added to the reeling and unwinding shaft to control the resistance generated by adjusting the current of the magnetic powder clutch to control the surface tension of the material. . Magnetic powder clutches and brakes are special automatic actuators. They transmit torque through magnetic powder filled in the working gap. Changing the excitation current can change the magnetic state of the magnetic powder, and then adjust the transmitted torque. It can be used for stepless speed regulation from zero to synchronous speed, suitable for fine-tuning of high-speed section and speed regulation system of medium and small power. It is also used for the unwinding or rewinding tension control system that adjusts the torque by adjusting the current to ensure that the tension remains constant during the winding process. Its main feature is that the magnetic powder clutch acts as a resistance device, and is controlled by the system to output a DC voltage to control the resistance generated by the magnetic powder clutch. The main advantage is that it is a passive device and can control less tension. Its main disadvantage is that the speed cannot be high, and it is easy to cause high-speed friction of the magnetic powder during high-speed operation, resulting in high temperature, which will cause the magnetic powder clutch to heat up and shorten its life.

Basic knowledge and development of slitting machine

In the modern packaging industry, slitting machine is a relatively important equipment that is often used before and after printing. It mainly slits raw materials before printing, such as paper, plastic film and so on. This is a process that raw material manufacturers must complete in order to meet the width requirements of packaging manufacturers such as customers. The most widely used slitting process after printing and compounding is to use a slitting machine to slit the printed and compounded films of multiple sets of patterns with a fixed width into finished film rolls to adapt to the automatic packaging and bag making process.

With the improvement of flexible packaging automation, and consumer goods manufacturers focusing on reducing inefficiency and pollution in intermediate links, some manufacturers have gradually changed the process flow and replaced manual packaging with automatic packaging lines with a higher degree of automation. With the increasing demand for coiled materials, the status of the slitting machine is becoming more and more important, which puts forward higher requirements for the working efficiency of the slitting machine.

When it comes to the working efficiency of the slitting machine, many people think that the working efficiency of the slitting machine is only related to the speed of the slitting machine. In fact, it is not. I think the working efficiency of the slitting machine is related to the following factors: cutting speed, finished product rate, non-operational occupancy time, stability, etc. Slitting speed is an important indicator of the working efficiency of the slitting machine, but if the yield is low, it will not only cause the working efficiency of the whole machine to be low, but also cause the cost to rise. Similarly, if the non-operation takes a long time, such as: adjusting the machine, setting the tool, changing the tool, changing the material, connecting the head, changing the roll, and dealing with the problem, it takes a long time, and it is meaningless to simply increase the speed of the slitting machine. . Not to mention the stability of the slitting machine, it will not only affect the working efficiency of the slitting machine, but also affect the product quality, and will cause trouble and unnecessary waste to the next process. Therefore, the working efficiency of the slitting machine is a comprehensive concept.

In the slitting process, a stable tension system is an important indicator to ensure product quality. It controls the mutual tension between unwinding, traction, slitting, and rewinding, so that the slitting material is always in the slitting process. a steady state. If the tension is properly controlled, the deformation and drift of the raw materials can be avoided during the speed-up and speed-down of the machine. Generally, the unwinding tension is slightly larger than the sum of the tension of the rewinding shaft. Most of the previous slitting machines used magnetic powder clutches to control the tension, but the speed of the magnetic powder clutches could not be high, and it was easy to cause high-speed friction of the magnetic powders during operation, resulting in high temperature and shortening its life. With the development of science and technology and the application of servo drive technology, vector variable frequency motors are now used to control the tension system of the slitting machine, and the automatic detection of swing rollers is used. The man-machine interface is intuitive, the tension system is more stable and reliable, and it is easy to operate.