Fleece-Laying Device Support Carriage Stabilization
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Solution Overview
Problem
Wide fleece layers, such as papermaker felt layers, experience air turbulence and eddying due to belt oscillations, leading to irregular fleece laying on output conveyor belts.
Innovation Solution
A fleece-laying device with a support carriage that guides card web conveyor belts over support rolls, ensuring the belts are tensioned uniformly and synchronized with the movement of the laying and upper carriages, thereby minimizing belt oscillations and air turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the card web conveyor belts are used as cover belts for wide fleece layers, then the belts can transport the card web to the laying nip, but the high belt speeds cause belt oscillations and air turbulence that subject the laid fleece to eddying
Solution Approach 1:
A support carriage is introduced as an intermediary element between the card web conveyor belts and the output conveyor belt. This support carriage carries support rolls that guide the lower strands of the card web conveyor belts, acting as a mediator to stabilize the belts and reduce their oscillations while maintaining high belt speeds for productivity
Solution Approach 2:
The support carriage functions as a counterbalancing element that offsets the oscillations of the card web conveyor belts. By positioning the support carriage with support rolls beneath the oscillating belts, it provides a stabilizing counterforce that reduces belt vibrations and the resulting air turbulence, thereby improving fleece uniformity without requiring reduced belt speed
2Object-affected harmful factors
If the lower sections of the card web conveyor belts serve as cover belts, then they cover the laid fleece to prevent eddying, but the upward and downward movement of these belts causes air turbulence and eddying
Solution Approach 1:
The support carriage serves as an intermediary support structure that stabilizes the lower sections of the card web conveyor belts. By providing support rolls that guide these belts, it reduces their upward and downward movements, thereby minimizing air turbulence and eddying while maintaining the protective cover belt function
3Stability of the object's composition
If a support carriage is provided to support the lower strand of the card web conveyor belt, then the oscillation of the belt is reduced, but eddying still occurs in very wide fleece layers
Solution Approach 1:
The support system is segmented by providing multiple support rolls within the support carriage. These multiple support points along the length of the card web conveyor belts provide distributed stabilization, effectively reducing oscillations across the entire span of wide fleece layers and preventing eddying that occurs with single-point support
Data Source
AI summary
A fleece-laying device for laying a fleece from a card web having a laying carriage movable above and transversely to an output conveyor belt, an upper carriage also movable transversely to the output conveyor belt, and a first card web conveyor belt and a second card web conveyor belt for guiding the card web via the upper carriage and the laying carriage into a laying nip formed in the laying carriage. The fleece-laying device includes a card web guiding area between the upper carriage and the laying carriage with two sections of the first and second card web conveyor belts holding the card web between them and being guided over at least one support roll mounted in a support carriage which is also movable transversely to the output conveyor belt.