Dynamic-Balance Vertical Vibration Isolator for Earthquake Load Control
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Solution Overview
Problem
Existing vertical vibration isolators face challenges in simultaneously achieving vibration insulation and balancing the dead weight of apparatuses during earthquakes, making it difficult to design and manufacture effective solutions that combine these functions.
Innovation Solution
A dynamic balance type vertical vibration isolator is developed, incorporating slide blocks, balance springs, mass blocks, stiffness-adjustable springs, and a pure mechanical structure, which maintains dynamic balance and provides excellent vertical vibration isolation without electronic components, using a configuration of slide blocks, balance springs, mass blocks, and stiffness-adjustable springs to manage forces during earthquakes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional vertical vibration isolators (thick rubber, spring bearings, pneumatic and hydraulic bearings) are used to balance the dead weight of apparatuses, then the bearing capacity is improved, but the height increases and the design and machining difficulty increases
Solution Approach 1:
The vibration isolator is divided into multiple functional components: balance springs for weight balancing, stiffness-adjustable springs for vibration isolation, and a mechanical structure with slide blocks and guide rods. This segmentation allows each component to perform its specific function efficiently, achieving weight balancing and vibration isolation without requiring excessive height
Solution Approach 2:
The patent introduces a mechanical structure with horizontal guide rods and vertical rods that operate in multiple dimensions. The slide blocks move along horizontal guide rods while connected to vertical rods, creating a multi-dimensional mechanism that achieves compact height while maintaining bearing capacity through the coordinated action of springs in different orientations
2Object-affected harmful factors
If traditional vertical vibration isolators are designed to provide vibration insulation, then the vibration isolation function is improved, but the ability to balance dead weight during earthquakes deteriorates
Solution Approach 1:
Balance springs are specifically designed to counterbalance the dead weight of the protected object. These springs are pre-loaded to provide an upward force equal to the weight of the apparatus, ensuring that during earthquakes, the system maintains dynamic balance and can respond to seismic forces without being overwhelmed by the static weight
Solution Approach 2:
The vibration isolator employs a dynamic mechanical structure with slide blocks that can move along horizontal guide rods and vertical rods that can extend and compress. This dynamic configuration allows the system to adapt its stiffness and force distribution in real-time during earthquakes, maintaining both vibration isolation and dynamic balance under varying load conditions
3Object-affected harmful factors
If stiffness-adjustable springs are used to provide vertical vibration isolation, then the vibration isolation effect is improved, but the force variability during earthquakes increases
Solution Approach 1:
The mechanical structure creates a feedback mechanism where the movement of slide blocks along horizontal guide rods is coupled with the compression and extension of vertical rods and stiffness-adjustable springs. When the apparatus experiences vertical vibration or seismic force, the slide blocks move horizontally, which in turn modulates the compression of the stiffness-adjustable springs, providing a self-regulating force response that reduces force variability
Solution Approach 2:
The stiffness of the vibration isolation system can be adjusted by modifying the pre-load or configuration of the stiffness-adjustable springs. This parameter adjustment allows optimization of the force characteristics during earthquakes, ensuring that the springs operate in a range where they provide effective vibration isolation while limiting extreme force variations under seismic loading
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 ensures constant forces on vertical rods, achieving dynamic balance and effective vertical vibration isolation, maintaining stability and reducing the upward or downward forces on the stiffness-adjustable springs, thus effectively isolating vibrations while balancing the weight of apparatuses or cultural relics.
Implementation Method 1
deformation quantities of the balance springs change when the slide blocks and the mass blocks slide along the horizontal guide rods
Data Source
AI summary
A dynamic balance type vertical vibration isolator includes slide blocks, balance springs, mass blocks, a fixed block, rotation shafts, stiffness-adjustable springs, etc. When an earthquake force is upward, the stiffness-adjustable springs are compressed, upward forces of the stiffness-adjustable springs are increased, meanwhile, the slide blocks and the mass blocks move away from the fixed block, the balance springs are stretched to generate pull forces, and the pull forces have vertically upward components, so as to reduce compression degrees of the stiffness-adjustable springs, and further to reduce the upward forces of the stiffness-adjustable springs. Similarly, when the earthquake force is downward, the stiffness-adjustable springs are stretched, downward forces of the stiffness-adjustable springs are increased, meanwhile, the slide blocks and the mass blocks move close to the fixed block, the balance springs are compressed to generate compression forces, and the compression forces have vertical downward components.