Fluid Pressure Cylinder Buffer Mechanism for Rotational Misalignment
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Solution Overview
Problem
Fluid pressure cylinders face issues with rotational motion of displacement blocks during workpiece transport, leading to potential damage, especially with fragile items like semiconductor chips, due to misalignment between piston rods and suction pipes, which results in improper buffering and workpiece misplacement.
Innovation Solution
A fluid pressure cylinder design featuring a buffer mechanism with a tapered buffer rod inserted through a displacement block, maintaining axial alignment and absorbing eccentricities to prevent rotational movement and ensure smooth axial displacement, thus protecting workpieces from excessive loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the clearance between the bushing and the piston rod/suction pipe is increased to absorb deviation, then the piston rod and suction pipe can accommodate misalignment, but the plate rotates causing the workpiece to rotate and cannot be placed at the desired position
Solution Approach 1:
The buffer rod serves as an intermediary element between the piston rod and the plate. It is inserted through the displacement block and engages with the piston rod, acting as a mediator that absorbs misalignment and eccentricity through its tapered geometry while preventing rotational motion of the plate, thus maintaining workpiece placement accuracy
Solution Approach 2:
The buffer rod employs a tapered shape with changing diameter along its length. This parameter change allows the buffer rod to accommodate misalignment and eccentricity - the larger diameter portion absorbs deviation while the smaller diameter portion maintains precise alignment, resolving the contradiction between adaptability and precision
2Adaptability or versatility
If the clearance is increased to absorb deviation, then the piston rod can accommodate misalignment, but the buffering mechanism cannot operate properly and loads are applied to the workpiece
Solution Approach 1:
The buffer rod serves as an intermediary that maintains reliable buffering operation while accommodating deviation. Its tapered shape allows it to engage properly with the piston rod even when misalignment exists, ensuring the buffering mechanism operates reliably to protect the workpiece from excessive loads
Solution Approach 2:
The tapered geometry of the buffer rod changes its engagement parameters with the piston rod based on the degree of misalignment. When deviation is present, the tapered shape allows the buffer rod to self-align and maintain proper engagement, ensuring the buffering mechanism operates reliably to protect the workpiece
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 buffer mechanism effectively suppresses rotational motion of the displacement block, ensuring accurate placement and preventing damage to workpieces by absorbing loads and eccentricities, allowing for safe transport of fragile items.
Implementation Method 1
an outer circumferential surface of the buffer rod being formed in a tapered shape, which is reduced gradually in diameter toward the body
Data Source
AI summary
A fluid pressure cylinder includes a displacement member, which is displaceable on an end side of a body, and a connecting body, which is connected to a piston rod of a cylinder unit, is inserted via a spring in a block body of the displacement member. A suction rod is connected substantially in parallel with the connecting body and a buffer rod connected to the connecting body. In addition, in a state where downward displacement of the block body is restricted, when additional loads are applied, the buffer rod is displaced relatively with respect to the block body in opposition to an elastic force of the spring, whereby an interval in a radial direction between a bushing and the buffer rod is enlarged.