Vibration Reduction Arrangement for Impact Machine
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Solution Overview
Problem
Impact machines used in quarries and construction experience significant vibrations during operation, leading to fatigue and potential injuries, and existing vibration damping methods are ineffective across a wide frequency range, particularly in hand-held machines with varying operating frequencies.
Innovation Solution
A vibration reduction arrangement featuring a counterweight with a motion reversing mechanism having non-linear spring characteristics, allowing for counter-acting movements that reduce vibrations across a wide frequency range, including a low force zone and a high force zone, and multiple counterweights distributed around the hammering element to enhance damping efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional vibration damping mechanisms with fixed spring constants are used, then the damping effect is effective at specific frequencies, but the damping effect becomes ineffective across a wide frequency range
Solution Approach 1:
The patent applies the dynamics principle by making the spring constant variable rather than fixed. The vibration damping mechanism uses springs whose stiffness changes dynamically based on the vibration amplitude or frequency, allowing the system to adapt to different operating conditions. This enables effective damping across a wide frequency range by adjusting the spring constant to match the resonant frequency of the housing at any given moment.
Solution Approach 2:
The patent implements parameter changes by modifying the physical parameters of the damping mechanism, specifically the spring constant. By changing the spring constant in response to varying vibration conditions, the system maintains optimal damping performance across different frequencies. This may involve using non-linear springs, adjustable spring arrangements, or mechanisms that change the effective stiffness based on operational parameters.
2Object-affected harmful factors
If the machine weight is increased to reduce vibration amplitude, then vibration amplitude decreases, but the machine weight and complexity increase
Solution Approach 1:
The patent applies the counterweight principle by introducing a movable counterweight element that generates opposing vibrations to cancel out the harmful vibrations from the impact mechanism. This counterweight is positioned and moved in such a way that its vibrational forces are equal in magnitude but opposite in direction to the harmful vibrations, thereby reducing the net vibration amplitude transmitted to the housing and handle without significantly increasing the overall machine weight.
Solution Approach 2:
The patent may employ composite materials or composite structures in the vibration damping mechanism, combining elements with different mechanical properties to achieve optimal damping performance. This could involve using materials with specific damping characteristics, composite spring structures, or hybrid mechanisms that combine passive and active damping elements, thereby achieving effective vibration reduction without excessive weight gain.
3Reliability
If complex vibration damping mechanisms are implemented, then vibration damping performance improves, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies segmentation by dividing the vibration damping function into multiple independent elements or stages. Rather than using a single complex mechanism, the damping system is segmented into separate components such as multiple springs, dampers, or counterweight elements that work in sequence or parallel. This modular approach simplifies manufacturing, maintenance, and adjustment while maintaining effective damping performance across different frequencies.
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 of the impact machine by creating a feed force that reduces the weight and stabilizes the machine's operation.
Implementation Method 1
a first spring-action arrangement (760) arranged inside said counterweight (750), said counterweight (750) being moveable a first distance (D1) extending in said first axial direction (A) without actuating said spring-action arrangement (760)
Implementation Method 2
a counterweight (750) and a first motion reversing mechanism (720) having non-linear spring characteristics, allowing for counter-acting movements that reduce vibrations across a wide frequency range
Implementation Method 3
The solution significantly decreases vibration amplitude and extends the frequency range of low vibration amplitude
Data Source
AI summary
The invention relates to an impact machine which is adapted to perform a hammering operation on a surface or an object to be worked upon. In particular, a vibration reduction arrangement is attached to the housing 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 of the hammering element thus substantially reducing the vibrations. A spring action arrangement is arranged inside said counter weight, the counter weight being movable a first distance without actuating the spring action arrangement, and the counterweight comprises displaceable projecting member for actuating the spring action arrangement.