The tension control of the wide-format packaging material printing production line is usually composed of a floating roller assembly and a gas-electric control system. A set of excellent performance tension control unit is designed. The mechanical structure design of the floating roller assembly is an extremely important part in the printing production line. The role can be described as important. As the core component of tension control, the floating roller assembly bears the important task of absorbing the disturbance force that causes tension fluctuations in the system, so it is also called the "mechanical filter" visually, and its dynamic performance directly affects its filtration and absorption. The strength of the role. In other words, if the quality, size, and moment of inertia of each part in the floating roller assembly do not match, it will affect the normal operation of the entire tension control system. Optimized design Figure 1 is a schematic diagram of a common tension control unit. The three cylinders shown in the figure, the lower one is used to balance the gravity of the floating roller assembly, and the upper two are used to control the tension required for normal production, for example: 0-2000N. In normal steady speed production, for a tension control system with good performance, the swing roller swing arm is in a horizontal position, and the swing amplitude of the swing arm is extremely small. Below we use the principles of kinematics and dynamics to explain the principles that should be followed when designing floating roller assemblies. To facilitate discussion, some parameter variables to be involved are given corresponding symbols: Assuming that the interference force is input from the "packaging material near the rotation axis A (for convenience of description, we call the material printed on the printing line as" packaging material, the same below "), the mechanical model is shown in Figure 2 below. According to the kinematics and dynamic principles of the rigid body rotating around a fixed axis, there are the following inferences Children scissors are a hot topic among parents and teachers alike; children love crafts and it`s a joy to see children expressing themselves creatively. But most such projects involve the use of scissors, and scissors can be dangerous. Even with all the attention on safety these days, there are thousands of scissor injuries-primarily cut fingers-sustained by young children each year. So what to do? When you`re looking for the ideal scissors for children look first for innovative blade safety technologies like Slice`s finger-friendly grind. Also look for a model that is designed to be ambidextrous and can easily be handled by small hands, with a comfortable grip. Children`s scissors also need to have a small blade area and, very important, the tip must be blunted. Put all that together and you`ve got children scissors that will let creativity blossom safely, effectively, and abundantly. School Scissors,Kids Scissors,Children Mini Scissors,Toddler Scissors Yangjiang Superwins Trade Co., Ltd. , https://www.steelkitchenware.nl