Air Spring Bearing With Throttle Damping for Vibratory Machines
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Solution Overview
Problem
Existing vibrating machines experience high deflections and dynamic loads during start-up and shut-down due to insufficient damping in their bearing systems, particularly when using steel or conventional air springs, which are inefficient and wear-prone, and two-mass systems are costly and complex.
Innovation Solution
A bearing device with an air spring connected to a compressed air reservoir through a throttle, which provides frequency-dependent dynamic stiffness and damping, decoupling automatically at resonance frequencies to minimize vibration peaks and dynamic loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional air springs or steel springs are used in the bearing device, then the structure is simple, but the damping is insufficient leading to high deflections during start-up and run-down
Solution Approach 1:
The patent combines an air spring with a compressed air reservoir and throttle valve to create a composite bearing device that integrates both support function and damping function in a single system, resolving the contradiction between structural simplicity and damping performance
Solution Approach 2:
The patent uses pneumatic elements (air spring, compressed air reservoir, and throttle valve) to provide frequency-dependent damping, achieving effective vibration control during start-up and run-down while maintaining structural simplicity through pneumatic components
2Reliability
If fluid dampers are used to increase damping, then damping effect is improved, but the service life is reduced due to wear under ambient conditions of vibrating machines
Solution Approach 1:
The patent replaces fluid dampers with a pneumatic damping system using compressed air reservoir and throttle valve, eliminating wear-prone mechanical components while maintaining effective damping performance throughout the service life
Solution Approach 2:
The patent uses wear-free pneumatic components instead of wear-prone fluid dampers, creating a bearing device that maintains its damping performance throughout the entire operational life without degradation
3Object-affected harmful factors
If the natural frequency of the bearing system is kept low for vibration isolation, then isolation performance is improved, but the deflection during start-up and run-down increases due to resonance
Solution Approach 1:
The patent creates a dynamic damping system where the compressed air reservoir and throttle valve provide frequency-dependent damping that automatically adapts to different operating conditions, providing low damping during steady operation and high damping during transient start-up and run-down phases
Solution Approach 2:
The patent uses the throttle valve to control the flow of compressed air, dynamically changing the damping parameter of the bearing device based on the operating frequency, thereby reducing deflection during resonance while maintaining low natural frequency for vibration isolation
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
The solution significantly reduces vibration amplitudes and dynamic loads during start-up and shut-down, achieving damping levels up to 20% and maintaining efficient operation without energy waste, with a simple and cost-effective design.
Implementation Method 1
at least one compressed air reservoir (11) fluidly connected to the air spring (10) per bearing point
Implementation Method 2
a throttle (13) connected between the air spring (10) and the compressed air reservoir (11)
Implementation Method 3
the natural frequency of the bearing system is selected to be as low as possible and below the operating frequency of the vibrating first machine part
Implementation Method 4
Both damping measures are insufficient for effective damping and avoiding the high deflections of the oscillating first machine part when the oscillating machine starts up and runs down
Data Source
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AI summary
The invention relates to a bearing device (1) for a vibratory machine (2), wherein the bearing device (1) is resiliently arranged between a first machine part (21), which vibrates during operation of the vibratory machine (2), and a second machine part (22) connected to an installation surface of the vibratory machine (2), and wherein the bearing device (1) has at least one air spring (10) per bearing point. The bearing device (1) according to the invention is characterized in that it furthermore has at least one compressed air reservoir (11), which is fluidically connected to the air spring (10), and in that a restrictor (13) is connected between the air spring (10) and the compressed air reservoir (11). In addition, the invention relates to a vibratory machine (2) having a bearing device (1), and to a method for operating a vibratory machine (2).