Carder Drum Structure-Borne Sound Sensing for Contact Detection
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Solution Overview
Problem
Existing methods for determining the carding gap in carders are inefficient and prone to causing damage due to frequent contact between components, especially at high rotational speeds, leading to non-uniform elastic deformations and potential collisions.
Innovation Solution
A carder design with acceleration sensors mounted on the drum to measure structure-borne sound, allowing precise detection of component contacts, using a network of sensors to filter out interference and provide accurate positioning and evaluation of contact events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotational speed of the drum is increased to achieve high production quantities, then productivity is improved, but centrifugal forces increase causing non-uniform elastic deformations in the drum, which leads to changes in the carding gap and potential collisions between components
Solution Approach 1:
The patent applies preliminary action by pre-adjusting the carding gap to account for expected elastic deformations at high rotational speeds. Before operation, the carding gap is set larger than the minimum required gap, compensating for the deformation that will occur when the drum reaches high speeds. This prevents collisions and maintains reliable operation throughout the speed range while preserving high productivity.
2Productivity
If the carding gap is reduced to improve carding efficiency, then the carding effect is enhanced, but the risk of contact and damage between the drum clothing and revolving flat clothing increases
Solution Approach 1:
The patent implements feedback by continuously monitoring the actual carding gap during operation using measurement devices. The measured gap information is fed back to the control system, which automatically adjusts the drum position or speed to maintain the optimal carding gap. This closed-loop control enables the system to operate at the minimum safe gap distance, maximizing carding efficiency while preventing contact damage through real-time correction of any deviations.
3Measurement precision
If traditional contact-based measurement methods are used to determine the carding gap, then measurement can be achieved, but frequent contact between components causes wear and potential damage
Solution Approach 1:
The patent replaces mechanical contact-based measurement systems with non-contact measurement methods. Optical sensors, capacitive sensors, or inductive sensors are used to measure the carding gap distance without physical contact between the measurement probe and the drum or revolving flat. This substitution eliminates wear and damage caused by contact while providing precise gap measurement, resolving the contradiction between measurement accuracy and component durability.
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 high-accuracy detection of component contacts, preventing damage by initiating countermeasures such as speed reduction or shutdown, thus maintaining the carding gap and reducing equipment wear.
Implementation Method 1
at least one acceleration sensor for measuring structure-borne sound is mounted on the drum
Data Source
AI summary
A carder has a drum formed as a hollow cylinder having a drum wall, a longitudinal axis, a circumference, an outer surface, a length, and a clothing provided on the outer surface. Working elements are arranged relative to the outer surface of the drum. Stub axles or a continuous axle is formed along the longitudinal axis of the drum and connected to the drum wall by spokes or disks. One or more acceleration sensors that measures structure-borne sound are mounted on one or more of: a side of the drum wall facing the longitudinal axis, the stub axles, the continuous axle, the spoked, or the disks within the length of the drum.