Industrial Roller Natural Frequency Tuning to Prevent Vibration
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Solution Overview
Problem
Industrial rollers in paper or board machines experience vibrations due to approaching critical rotation speeds, which are difficult to prevent without stopping the machine, as existing methods for adjusting natural frequency require discontinuing operation.
Innovation Solution
The solution involves adjusting the mass of liquid within one or two liquid chambers within the roller using adjustable pistons, coupled with a gas chamber, allowing for gradual adjustment of natural frequency during operation through a system that includes sensors, controllers, and pumping apparatuses to manage liquid and gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the natural frequency of the roller is adjusted by known methods, then vibration is prevented, but the roller operation must be stopped and machine operation discontinued
Solution Approach 1:
The patent applies dynamics by making the roller's mass adjustable during operation through liquid injection and removal systems. The mass can be dynamically changed by injecting or removing liquid from the roller's internal chambers, allowing the natural frequency to be adjusted without stopping the roller, thus preventing vibration while maintaining continuous machine operation.
Solution Approach 2:
The patent changes the physical parameter of mass by injecting or removing liquid from the roller's internal chambers. This parameter change allows the natural frequency of the roller to be adjusted during operation, enabling vibration prevention without requiring the roller to be stopped or the machine operation to be discontinued.
2Object-affected harmful factors
If the mass of the roller is increased to adjust natural frequency, then vibration prevention is achieved, but the roller becomes more imbalanced
Solution Approach 1:
The patent applies local quality by injecting liquid into specific internal chambers of the roller rather than uniformly distributing mass. This localized mass adjustment allows precise control over the roller's natural frequency while maintaining balance, as the liquid can be injected into chambers positioned to counteract specific vibration modes without creating overall imbalance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables continuous operation by allowing flexible adjustment of the roller's natural frequency, preventing vibrations without causing imbalance, and is mechanically simple and reliable.
Implementation Method 1
Position of the piston determines volume of the respective liquid chamber for varying mass of liquid within the liquid chamber
Implementation Method 2
When there are two liquid chambers and thus two pistons, the gas chamber is determined by the inner surface of the shell and the two pistons and configured to be filled with pressurized gas
Data Source
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AI summary
The present invention relates to an industrial roller system with adjustable natural frequency and a system and method for adjusting natural frequency of the industrial roller system. There is one liquid chamber at one end of the shell of the industrial roller or there are two liquid chambers at the two opposite ends of a shell of the industrial roller, and a slidably moveable piston separates each liquid chamber from a gas chamber. Natural frequency of the industrial roller is variable by adjusting amount of liquid in the one or two liquid chambers and amount of pressurized gas in the gas chamber. Amounts of liquid and pressurized gas are adjusted via respective liquid and gas inlets/outlets arranged in a shaft of the industrial roller.