Vertical Seismic Isolation Apparatus Using Scott-Russell Guide Mechanism
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Solution Overview
Problem
Existing vertical seismic isolation devices face challenges in providing smooth vertical movement while preventing rocking, leading to increased size and weight, and hindering easy handling due to the need for side walls and layered rubber pieces.
Innovation Solution
A vertical seismic isolation device featuring a support guide mechanism with a Scott-Russell mechanism, comprising a track rail, moving block, support leg, and auxiliary leg, which allows only vertical movement and maintains a constant distance between the movable and fixed frames, preventing rocking and enabling smooth vertical movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If side walls and layered rubber pieces are provided to prevent rocking, then the movable frame can be prevented from rocking, but the size and weight of the fixed frame increase
Solution Approach 1:
The patent extracts the rocking prevention function from the side walls and layered rubber pieces, and implements it through a guide mechanism consisting of guide rails and guide rollers. This separates the vertical movement guidance function from the structural support function, allowing the fixed frame to be smaller and lighter while still preventing rocking effectively.
Solution Approach 2:
The patent introduces guide rollers as an intermediary element between the movable frame and the fixed frame. These rollers interact with the guide rails to constrain horizontal movement and prevent rocking, while bearing the load of the movable frame. This intermediary mechanism achieves rocking prevention without requiring heavy side walls and layered rubber pieces.
2Stability of the object's composition
If side walls with layered rubber pieces are provided to prevent rocking, then the movable frame can be prevented from rocking, but the vertical movement becomes hindered
Solution Approach 1:
The patent replaces the mechanical friction-based rocking prevention (layered rubber pieces) with a rolling contact system (guide rollers on guide rails). The guide rollers rotate along the guide rails, providing rocking prevention through geometric constraint rather than friction, thereby enabling smooth vertical movement without the hindrance caused by rubber piece abutment.
Solution Approach 2:
The patent makes the guide rollers rotatable, allowing them to dynamically adapt to the vertical movement of the movable frame. As the movable frame moves vertically, the guide rollers rotate along the guide rails, maintaining continuous contact for rocking prevention while facilitating smooth movement. This dynamic rolling contact replaces the static friction-based system.
3Reliability
If a four-joint link structure is used for seismic isolation, then the structure can provide vibration isolation, but the movable frame cannot stand alone and requires additional support structures
Solution Approach 1:
The patent merges the vibration isolation function with the support and guidance functions into an integrated system. The guide mechanism (guide rails and guide rollers) simultaneously provides structural support, prevents rocking, and guides vertical movement, while the seismic isolation units provide vibration isolation. This consolidation eliminates the need for separate heavy side walls and layered rubber pieces, reducing overall device complexity.
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 device allows for smooth vertical movement of the movable frame without rocking, reducing size and weight, and facilitating easy handling while effectively isolating objects from vertical vibrations.
Implementation Method 1
a moving block, which is assembled to the track rail through intermediation of a large number of rolling elements
Implementation Method 2
a support leg, which has one end rotatably coupled to the moving block and another end rotatably coupled to the movable frame, and is configured to convert the vertical movement of the movable frame into a motion of the moving block along a longitudinal direction of the track rail
Implementation Method 3
a restoration member which is configured to urge the movable frame so as to maintain a constant distance between the movable frame and the fixed frame
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Provided is a vertical seismic isolation device, which enables smooth vertical movement of a movable frame on which an object subjected to seismic isolation is placed, and is small in size and weight and enables easy handling, the vertical seismic isolation device including: a fixed frame (2); a movable frame (3), which is arranged on the fixed frame; a support guide mechanism (4) which allows only vertical movement of the movable frame; and a restoration member (5) which maintains a constant distance between the movable frame (3) and the fixed frame (2). The support guide mechanism (4) includes: a track rail (40) which is provided on the fixed frame (2) ; a moving block (41), which is assembled to the track rail through intermediation of a large number of rolling elements; a support leg (42), which has one end coupled to the moving block and another end coupled to the movable frame (3), and is configured to convert vertical movement of the movable frame into a motion of the moving block (41); and an auxiliary leg (43), which has a length set to one-half of a length of the support leg (42), and has one end coupled to the support leg (42) at an intermediate position in a longitudinal direction of the support leg (42) and another end coupled to the fixed frame (2).