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
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