Vibration Generator With Variable Speed Unbalanced Masses
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Solution Overview
Problem
Existing vibration generators for construction machines face challenges in adapting to different soil conditions due to fixed sinusoidal force patterns, leading to inefficiencies in bringing soil into a pseudo-liquid state and generating unwanted lateral forces.
Innovation Solution
The vibration generator features coaxially arranged unbalanced masses with variable speed differences, allowing for adjustable phase shifts and vibration characteristics by splitting unbalance trains and using separate drive motors controlled by a regulation apparatus, eliminating the need for bulky planetary gearing and enabling sinusoidal and cosinusoidal vibrations to be superimposed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed sinusoidal force patterns are used in vibration generators, then the structure is simple, but the adaptability to different soil conditions deteriorates
Solution Approach 1:
The patent applies dynamics by making the vibration characteristics adjustable through variable speed differences between unbalanced masses. The regulation apparatus enables continuous adjustment of phase shifts and vibration parameters, transforming a static system into a dynamic one that can adapt to different soil conditions while maintaining reasonable structural complexity.
2Ease of operation
If planetary gearing is used for phase adjustment, then the phase position can be adjusted, but the device size increases
Solution Approach 1:
The patent replaces the traditional mechanical planetary gearing system with a regulation apparatus that controls variable speed differences between unbalanced masses. This substitution eliminates bulky mechanical components while achieving the same phase adjustment function through speed control, significantly reducing device size.
Solution Approach 2:
Instead of adjusting phase position through mechanical gear ratios, the patent changes the operational parameters by controlling the speed differences between unbalanced masses. This parameter-based approach allows for compact design while maintaining full phase adjustment capability.
3Device complexity
If unbalanced masses rotate at the same speed, then the structure is simple, but the ability to generate cosinusoidal vibrations deteriorates
Solution Approach 1:
The patent implements dynamics by enabling variable speed rotation of unbalanced masses through the regulation apparatus. This allows the system to generate different vibration types (sinusoidal, cosinusoidal, and intermediate forms) by adjusting speed ratios, transforming a single-mode system into a multi-mode dynamic system.
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 design allows for a compact, balanced vibration generator that can adapt to various soil conditions, improving vibration efficiency and reducing unwanted forces, ensuring effective soil compaction and pile driving.
Implementation Method 1
unbalanced masses that generate accelerations and thus the desired vibrations by corresponding centrifugal forces during the revolution movement
Data Source
AI summary
The invention relates to a vibration generator for piling machines, compactors or other construction machines, having at least two unbalance trains, each comprising unbalanced masses which are rotatingly drivable by a drive apparatus, and an adjustment apparatus for adjusting the phase position of the rotating unbalanced masses relative to each other. According to the invention, the unbalanced masses of different unbalance trains are arranged coaxially without a fixed transmission ratio relative to each other, wherein the unbalanced masses of a first unbalance train are arranged between the unbalanced masses, coaxial therewith, of a second unbalance train, and the drive apparatus is designed to drive the unbalance trains with rotation speed differences which are variable relative to each other.