Fiber Bundle Condensing Structure for Faster Suction Attraction
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Solution Overview
Problem
Existing fiber bundle condensing devices in spinning machines face challenges in minimizing the distance from the delivery roller pair to the air-permeable transport belt, leading to fiber disorder due to slower air flow velocities near the suction pipe upstream end, which delays fiber attraction and increases the risk of disorder.
Innovation Solution
The fiber bundle condensing device incorporates a suction pipe with an upstream end design featuring an introduction surface and flow expansion surface that directs air flow efficiently into the suction slit, reducing swirling and maintaining high air flow velocity, thereby quickly attracting the fiber bundle onto the air-permeable transport belt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the upstream end of the suction slit is extended to increase suction force, then the attraction of fiber bundle is improved, but air flow velocity decreases and swirling air is generated which delays fiber attraction
Solution Approach 1:
The suction pipe incorporates a specific geometric structure at its upstream end with an inclined surface and flow expansion surface. This local geometric modification creates a flow path that directs air flow efficiently into the suction slit while preventing swirling, thus maintaining high air flow velocity even as the suction slit is extended to increase suction force.
2Stability of the object's composition
If the distance from delivery roller pair to air-permeable transport belt is decreased to prevent fiber disorder, then fiber disorder is suppressed, but the design complexity increases due to space constraints
Solution Approach 1:
The suction pipe is positioned and oriented such that its upstream end is located on the bottom roller side under the common tangent of the delivery roller pair. This spatial arrangement in a different dimension allows the suction slit to be extended upstream without increasing the horizontal distance from the delivery roller pair, thus maintaining fiber bundle order while accommodating the suction mechanism.
3Force
If the suction slit is extended upstream to increase suction force, then fiber attraction is improved, but the free distance where fiber is uncontrolled increases
Solution Approach 1:
The geometric parameters of the suction pipe upstream end are optimized with an inclined surface at a specific angle and a flow expansion surface that expands the flow path. This parameter optimization ensures that air flow velocity is maintained at high levels even as the suction slit is extended, thus not delaying fiber attraction timing while increasing suction force.
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 design enhances the attraction and condensation of fiber bundles onto the transport belt, reducing fiber disorder and stabilizing yarn quality while minimizing power consumption and preventing jamming, allowing for a shorter free distance from the delivery roller pair.
Implementation Method 1
The fiber bundle is subjected to a suction force generated in a suction slit of the suction pipe via the air-permeable transport belt
Implementation Method 2
Air flowing along the upstream end to swirl along the inner surface of the suction pipe
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A fiber bundle condensing device (11) of a spinning machine includes: a suction pipe (15) having a suction slit (27); and an air-permeable transport belt (16) wound on the suction pipe (15). The suction slit (27) has an upstream end (31). The upstream end (31) has: an introduction surface (31c) that is located on a bottom roller (13a) side of delivery roller pair (13) under a common tangent (L) to the delivery roller pair (13) at a nip point (P1) and defines a flow path of air to introduce the air into the suction slit (27); and a flow expansion surface (31b) obliquely intersecting the introduction surface (31c), located between an outer surface and an inner surface of the suction pipe (15), and expanding the flow path. A first angle (θ1) between a first imaginary line (D1) along the introduction surface (31c) and the common tangent (L) is smaller than a second angle (θ2) between a second imaginary line (D2) along the flow expansion surface (31b) and the common tangent (L).