Pneumatic Fiber Compaction Suction Pipe Slit Design
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Solution Overview
Problem
Existing fiber compression devices in spinning machines move individual fibers transversely to the conveying direction, leading to loss of stretching and fiber structure deflection, which results in yarn twist and hairiness.
Innovation Solution
A pneumatic compression system with a fiber bundling zone and a suction pipe wrapped around a screen element, where the suction pipe has a slit-shaped opening that guides protruding fibers back into the fiber structure without deflecting it from its running direction, ensuring continuous clamping and minimizing deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If individual fibers are moved transversely to the conveying direction via a perforated transport means, then fiber compression is achieved, but the stretching of the fiber structure is lost and fiber structure deflection occurs
Solution Approach 1:
The patent replaces the mechanical transverse movement system (perforated transport means moving fibers sideways) with a pneumatic system (suction pipe with air flow). The air flow guides protruding fiber ends back into the fiber structure without mechanical transverse displacement, thus maintaining fiber alignment while achieving compression.
Solution Approach 2:
The patent uses a suction pipe with air flow to guide fiber ends into the fiber structure. The pneumatic field created by the suction pipe directs protruding fibers back into alignment without requiring mechanical transverse movement, resolving the contradiction between compression and alignment preservation.
2Manufacturing precision
If fibers are moved transversely to the running direction through a screen element, then fiber bundling is achieved, but yarn twist and hairiness increase
Solution Approach 1:
The patent replaces mechanical transverse movement through screen elements with a pneumatic guidance system. The air flow from the suction pipe gently guides protruding fiber ends back into the fiber structure, avoiding the mechanical forces that cause yarn twist and hairiness while still achieving fiber bundling.
Solution Approach 2:
The patent introduces air flow as an intermediary between the fiber structure and the compression mechanism. Instead of directly mechanically moving fibers transversely, the air flow mediates the process by guiding fiber ends back into alignment, thus achieving compression without generating harmful yarn twist and hairiness.
3Manufacturing precision
If a large distance between clamping points is used, then fiber structure compression is achieved, but individual fibers are moved transversely leading to loss of stretching
Solution Approach 1:
The patent replaces the need for large-distance mechanical compression with a localized pneumatic system. The suction pipe with slit-shaped opening creates a focused air flow that guides fiber ends into the fiber structure over a short distance, achieving compression without the need for large clamping point separation that would cause transverse fiber movement.
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 solution effectively bundles fibers without losing stretching, reduces hairiness, and maintains the fiber structure's alignment, preventing yarn twist and ensuring efficient fiber compression.
Implementation Method 1
a suction pipe (21) with a slit-shaped suction opening (24}, which is arranged in the fiber bundling zone, the slit-shaped suction opening in the suction pipe being arranged from one end of the suction pipe facing the second clamping point in the direction of the third clamping point
Data Source
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AI summary
The invention relates to a drawing frame (2) for a spinning machine for drawing a fibre composite (1), said drawing frame comprising: at least one first roller pair (6) consisting of a top roller (7) and a bottom roller (8); a second roller pair (9) consisting of an output top roller (11) and an output bottom roller (12), wherein a first clamping point (K1) is defined by the first roller pair (6) and a second clamping point (K2) is defined by the second roller pair (9), and the first clamping point (K1) and the second clamping point (K2) form a drawing field plane (4) through which the fibre composite (1) passes in a running direction (3) from the first clamping point (K1) to the second clamping point (K2); a fibre compaction zone, arranged downstream of the output roller pair (9), for compacting the drawn fibre composite, said zone having a pneumatic compaction device with a fibre bundling zone (20) and with a suction tube (21) around which a screen element (22) is wrapped and which can be subjected to suction, wherein the fibre bundling zone (20) is delimited by the second clamping point (K2) and a third clamping point (K3), and the third clamping point (K3) is formed by the output top roller (10) and the screen element (22). The suction tube (21) has a slot-shaped suction opening (24) having a length (L) of 2.0 mm to 5.0 mm which is located in the fibre bundling zone (20), wherein the slot-shaped suction opening (24) is located in the suction tube (21) on an end of the suction tube (21) facing the second clamping point (K2) in the direction of the third clamping point (K3).