Double-Motor Rheometer Extension Assembly Gearless Drive
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Solution Overview
Problem
Conventional rheometers face limitations in accurately measuring the extensional properties of materials due to gear mechanisms, which introduce inaccuracies and restrict the ability to perform oscillatory measurements.
Innovation Solution
A double motor rheometer with a gearless drive train allows independent control of two measuring motors, enabling precise rotational movements and torsional moment determination, and an extension assembly with sample holding parts that can rotate independently, facilitating complex extension and oscillation profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a gear mechanism is used to drive the sample holding parts, then the structural complexity is reduced and ease of manufacture is improved, but measurement precision deteriorates due to gear backlash and mechanical inaccuracies
Solution Approach 1:
The patent removes the gear mechanism from the drive train, extracting the source of mechanical inaccuracies. The sample holding parts are driven directly by motors without intermediate gear transmissions, eliminating gear backlash and mechanical play that compromise measurement precision.
Solution Approach 2:
The patent replaces the mechanical gear transmission system with a direct motor-drive system. This substitution eliminates the mechanical inaccuracies inherent in gear mechanisms while maintaining the ability to drive the sample holding parts, thereby improving measurement accuracy at the cost of increased device complexity.
2Adaptability or versatility
If a single motor drives both sample holding parts, then device complexity is reduced, but the ability to perform oscillatory measurements and complex extension profiles is limited
Solution Approach 1:
The patent divides the drive system into two independent motor units, each controlling one sample holding part. This segmentation allows independent control of extension and oscillation movements, enabling complex testing profiles that cannot be achieved with a single motor.
Solution Approach 2:
The patent implements dynamic control capabilities by equipping each sample holding part with its own motor. This allows real-time independent adjustment of rotational speed, direction, and oscillation parameters, providing the versatility needed for various extensional rheology tests including oscillatory measurements.
3Reliability
If gear mechanisms are used in the drive train, then ease of manufacture is improved, but reliability deteriorates due to mechanical wear and backlash
Solution Approach 1:
The patent extracts and removes the gear mechanism from the system, eliminating the source of mechanical wear and backlash. The direct-drive architecture eliminates intermediate mechanical components that can wear out, thereby improving measurement reliability.
Solution Approach 2:
The patent replaces the mechanical gear transmission system with a direct motor-drive system, substituting a wear-prone mechanical transmission with a more reliable direct coupling between motor and sample holding parts.
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
This configuration enhances measurement accuracy, enables oscillatory testing, and allows for precise control of tensile stress and complex movement profiles, overcoming the limitations of conventional rheometers.
Implementation Method 1
the first sample holding part is drivable by the first measuring motor in a rotational movement about a first axis; the second sample holding part is drivable by the second measuring motor in a rotational movement about a second axis
Implementation Method 2
each of the first measuring motor and the second measuring motor is provided for determining a torsional moment generated by the corresponding measuring motor
Data Source
AI summary
An extension assembly is connected or connectable, in terms of driving, to a double-motor rheometer. The double-motor rheometer includes first and second measuring motors controllable independently of each other, and provided for determining a torsional moment generated by the corresponding measuring motor. The extension assembly includes first and second sample holding parts for holding a first sample portion and a second sample portion of the sample. The first sample holding part is driveable by the first measuring motor in a rotational movement about a first axis, and the second sample holding part is driveable by the second measuring motor in a rotational movement about a second axis. The first axis is arranged so as to be parallel to and spaced apart from the second axis. The sample held in the first sample portion and in the second sample portion extends between the respective sample holding parts.