SMA Actuator for Carding Machine Gap Adjustment
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Solution Overview
Problem
High-performance carding machines face issues with thermal expansion leading to unstable working distances between drum and working elements, causing damage due to unequal temperature distribution and centrifugal forces, which affects carding quality and requires precise and constant gap maintenance.
Innovation Solution
A device using a shape memory alloy (SMA) element as an actuating device to adjust the working distance between the drum and working elements, allowing for self-adjustment based on temperature changes without the need for external energy, with optional electrical voltage control and cooling for enhanced precision and response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-performance carding machines operate at high speeds with enclosed working organs, then productivity and safety are improved, but thermal expansion causes working distance instability and component damage
Solution Approach 1:
The patent applies parameter changes by utilizing the thermal expansion properties of shape memory alloy elements. When temperature increases due to high-speed operation, the SMA elements expand predictably, and this expansion is mechanically coupled to adjust the working distance between drum and working elements, compensating for thermal effects and maintaining stable gaps despite high productivity operation
Solution Approach 2:
The patent implements feedback through temperature sensors that continuously monitor the thermal state of the carding machine. The measured temperature is fed back to a control unit, which calculates the required adjustment and actuates the shape memory alloy elements accordingly, creating a closed-loop system that maintains working distance stability despite temperature variations during high-speed operation
2Manufacturing precision
If traditional adjusting devices use Peltier elements or electrical resistors, then working distance adjustment is possible, but energy consumption increases and response precision is insufficient
Solution Approach 1:
The patent applies self-service by utilizing the inherent thermal expansion properties of shape memory alloy elements. The SMA elements automatically adjust the working distance in response to temperature changes without requiring external energy input for actuation. The system leverages the thermal energy already present in the high-speed carding operation to drive the adjustment mechanism, eliminating the need for additional heating elements or actuators
Solution Approach 2:
The patent changes the physical parameter of using shape memory alloy materials with high thermal expansion coefficients. This material property enables larger adjustment ranges and finer control precision compared to traditional Peltier elements or electrical resistors, while consuming less energy since the adjustment is driven by passive thermal response rather than active electrical heating
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 SMA element ensures a constant working distance, minimizing damage and maintaining optimal carding quality by automatically adjusting to thermal expansions and centrifugal forces, with improved precision and reduced energy consumption.
Implementation Method 1
at least one shape memory alloy (SMA) element, whose property as a solid-state actuator is used to reduce the working distance between the drum and the working element during operation of the spinning preparation machine
Implementation Method 2
the material parameters (e.g. the linear expansion coefficient) of the SMA element are selected in such a way that when the spinning preparation machine has reached its operating temperature and there is thermal expansion of the drum and an adjacent working element
Implementation Method 3
the distances between drum and flats, doffers, adjacent rollers, fixed flats and separating points decrease. In extreme cases, the gap set between the active surfaces can be reduced by thermal expansion
Data Source
Figure 1
Figure 2a~2b
Figure 3~3a
AI summary
The invention relates to a device (100) and a method for adjusting a working distance (a) between a garnished drum (4) and at least one adjacent working element (5) in a spinning preparation machine, in particular a carding machine (K). The drum (4) and the working element (5) interact at the working distance (a). The working distance (a) between the drum (4) and the working element (5) is set or readjusted during operation of the spinning preparation machine using at least one shape memory alloy element (FGL element 110).