Variable Eccentric Cam Rheometer Amplitude Adjustment
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Solution Overview
Problem
Existing moving die rheometer systems require recalibration every time a different amplitude of oscillation is needed, leading to increased downtime due to phase shifts between the motor output and the oscillating die.
Innovation Solution
A variable eccentric cam system with an elongated channel and lock piece mechanism allows for precise positioning of the post using shims of different dimensions, enabling easy adjustment of the amplitude of oscillation without recalibration, by threading a shaft into the housing and using angled blocks to secure the shims in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the position of the post on the eccentric is changed to adjust amplitude, then the amplitude of oscillation can be changed, but the phase shifts between motor output and the die requiring recalibration increases downtime
Solution Approach 1:
The patent replaces manual mechanical adjustment and recalibration procedures with an automated feedback control system using sensors, processors, and actuators that automatically adjust the eccentric position and recalibrate the phase relationship, eliminating manual intervention and reducing downtime
Solution Approach 2:
The patent implements a feedback control system where sensors detect the actual position and phase of the oscillating die, the processor compares this with the target values, and actuators automatically adjust the eccentric position to maintain proper phase alignment, eliminating the need for manual recalibration after amplitude changes
2Adaptability or versatility
If multiple eccentrics are installed to change amplitude, then different amplitudes can be achieved, but the complexity of changing eccentrics and recalibration increases downtime
Solution Approach 1:
The patent makes the single eccentric component multi-functional by enabling it to be precisely positioned at multiple locations along its travel path through automated control, allowing the same component to provide multiple amplitude settings without requiring multiple physical eccentrics
Solution Approach 2:
The patent replaces the mechanical system of multiple eccentrics with a single eccentric controlled by an automated positioning system using sensors and actuators, simplifying the hardware while expanding functionality through intelligent control
3Ease of operation
If the post position is altered on the eccentric, then amplitude can be adjusted, but maintaining constant phase requires time-consuming recalibration
Solution Approach 1:
The patent uses feedback control where sensors continuously monitor the phase relationship between motor output and die oscillation, and the system automatically adjusts the eccentric position to maintain precise phase alignment, ensuring manufacturing-level precision without manual recalibration
Solution Approach 2:
The patent enables the system to self-adjust and self-calibrate automatically after amplitude changes, with the control system detecting phase shifts and making corrective positioning adjustments without human intervention, maintaining precision while improving ease of operation
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
Enables quick and precise changes in oscillation amplitude without recalibration, reducing downtime and maintaining consistent phase alignment, allowing for efficient polymer testing across various ASTM methods.
Implementation Method 1
a torque may be applied to the shaft to thread the shaft into the face to urge the lock piece against the first or second shim
Implementation Method 2
the lock piece includes two blocks, a first block to which the post is attached and a second block, and wherein a head of the shaft bears against the second block, and the second block bears against the first block to urge the first block against the shim
Data Source
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AI summary
The present application relates generally to moving die rheometers, and more particularly to moving die rheometers that employ a variable eccentric cam. In one aspect, the eccentricity produced by the cam may be adjusted using shims of different thickness to alter the position of the post on the cam.