Impact Machine Vibration Reduction Arrangement
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Solution Overview
Problem
Impact machines used in quarries and construction applications experience significant vibrations, leading to potential body injuries and machine wear, with existing vibration damping methods failing to provide effective reduction across a wide frequency range and often resulting in sudden vibration increases.
Innovation Solution
A vibration reduction arrangement featuring a counterweight with a motion reversing mechanism, comprising spring-action members with specific spring coefficients and a gap or low force zone, allowing the counterweight to move freely without spring action in certain phases, effectively decelerating and reversing its motion to reduce vibrations across a broader frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional vibration damping mechanisms with constant spring constants are used, then the damping effect is limited to a narrow frequency range, but the vibration amplitude increases suddenly when operating outside this range
Solution Approach 1:
The patent applies the dynamics principle by making the spring constant variable rather than constant. The vibration damping mechanism uses a first spring with a progressive spring constant that changes based on the compression distance, allowing the system to adapt to different operating frequencies. This dynamic adjustment enables effective damping across a wide frequency range while maintaining stable vibration amplitude characteristics.
Solution Approach 2:
The patent implements parameter changes by modifying the spring constant parameter from a fixed value to a variable parameter that changes with compression distance. The first spring's progressive spring constant increases as it is compressed, while the second spring provides a different spring constant characteristic. This parameter variation allows the vibration damping mechanism to maintain effectiveness across different operating conditions and frequencies.
2Object-affected harmful factors
If the machine weight is increased to reduce vibration amplitude, then the vibration amplitude decreases, but the machine weight and impact element weight increase
Solution Approach 1:
The patent replaces the traditional mechanical approach of increasing machine weight to reduce vibrations with a spring-based vibration damping mechanism. Instead of relying on mass to dampen vibrations, the invention uses the elastic properties and progressive spring constants of the first and second springs to actively counteract vibrations, achieving the same effect without increasing overall machine weight.
Solution Approach 2:
The patent changes the approach from modifying mass parameters to modifying spring constant parameters. By adjusting the spring constants and compression distances of the first and second springs, the system achieves vibration reduction through elastic force variations rather than through mass increase, thereby reducing the weight of moving components.
3Speed
If multiple springs with different lengths are used in parallel, then the spring constant increases and natural frequency shifts higher, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the vibration damping function into two distinct spring components: a first spring with a progressive spring constant and a second spring with a different spring constant characteristic. These segmented spring elements work together in parallel, with each contributing specific damping characteristics, thereby achieving complex vibration control functionality while maintaining relative structural simplicity through modular design.
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 decreases vibration amplitude and extends the frequency range of low vibration amplitude, improving the efficiency and safety of impact machines by reducing the overall weight and maintaining low vibrations even when the machine operates outside its optimal frequency range.
Implementation Method 1
at least one motion reversing mechanism each of said motion reversion mechanism comprising at least one spring-action arrangement
Implementation Method 2
a counterweight being displaceable in a first axial direction between a first counterweight position and a second counterweight position in response to the hammering action of said hammering element
Data Source
Figure 1a
Figure 1b
Figure 2a~2b
AI summary
Impact machine (100, 200) which is adapted to perform a hammering operation on a surface or an object to be worked upon. In particular, a vibration reduction arrangement (140, 240) is attached to the housing (105, 205, 305, 405) and comprises a moveable counterweight, interacting with a motion reversing arrangement having a non-linear spring characteristics, such that the motion of the counterweight can be brought into a counter-acting movement in relation to the vibrations in the housing (105, 205, 305, 405) of the hammering element (110, 210, 310, 410) thus substantially reducing the vibrations.