Fine Spinning Machine Velocity Ratio Adjustment
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Solution Overview
Problem
Existing fine spinning machines face challenges in modifying the circumferential velocity ratio of delivery roller pairs to nip roller pairs, which affects yarn quality, and changes in this ratio due to roller grinding lower the quality further, with current solutions requiring numerous component replacements and hindering visual inspection of fiber bundle condensation.
Innovation Solution
A fine spinning machine design featuring a fiber bundle condensing device with a modifiable circumferential velocity ratio, utilizing a nip roller pair and a suction pipe with an air-permeable apron, where the rollers are driven by separate sources and a pressing mechanism ensures consistent contact, allowing for adjustable velocity ratios and minimizing changes during roller grinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a gear transmission mechanism or drive belt is used to transmit rotational drive force from delivery roller pair to nip roller pair, then the structure is simple, but modifying the circumferential velocity ratio requires replacing a large number of parts or components
Solution Approach 1:
The patent applies dynamics by making the circumferential velocity ratio adjustable rather than fixed. The drive source for the nip roller pair is designed to be independently controllable, allowing the velocity ratio to be dynamically changed according to different yarn materials and processing requirements, resolving the contradiction between structural simplicity and adaptability
Solution Approach 2:
The patent changes the parameter of circumferential velocity ratio from a fixed value to a variable parameter. By enabling independent control of the nip roller pair's drive source, the system can adjust velocity ratios to optimize yarn quality for different materials without requiring component replacement, thus resolving the technical contradiction
2Ease of repair
If the lower nip roller is coupled with a single shaft to reduce the number of parts, then the number of parts to be replaced is reduced, but replacement of the air-permeable apron is hindered
Solution Approach 1:
The patent applies segmentation by separating the drive mechanism from the nip roller pair structure. The drive source is independently mounted and can be controlled separately from the rollers, allowing the air-permeable apron to be replaced without affecting the drive system, thus resolving the contradiction between reducing part count and maintaining ease of repair
Solution Approach 2:
The patent extracts the drive function from the roller assembly by providing an independent drive source for the nip roller pair. This separation allows the air-permeable apron to be replaced independently without disturbing the drive mechanism, resolving the technical contradiction between structural integration and maintenance accessibility
3Ease of manufacture
If the suction pipe is disposed on the same side as the upper roller, then the structure is compact, but visual inspection of fiber bundle condensation is hindered and roller wear affects position stability
Solution Approach 1:
The patent resolves the spatial conflict by arranging the suction pipe and nip roller pair in different spatial dimensions or positions that do not interfere with each other. This allows the suction pipe to be positioned optimally for both structural compactness and inspection accessibility, while the independently controlled nip roller pair maintains stable positioning despite wear
Solution Approach 2:
By making the nip roller pair's drive independent and controllable, the system can dynamically adjust to maintain proper positioning even when roller wear occurs. The independent control allows compensation for position changes, resolving the contradiction between structural compactness and position stability
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 flexible adjustment of the circumferential velocity ratio based on yarn material and maintains optimal settings despite roller grinding, preventing quality degradation by allowing separate drive sources for rollers and ensuring consistent apron movement speed.
Implementation Method 1
a suction pipe 5 disposed upstream of the nip roller pair 7 and downstream of the delivery roller pair 2, and an air-permeable apron 6 mounted on the suction pipe 5 in a surrounding manner
Data Source
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AI summary
A fine spinning machine includes a fiber bundle condensing device (3) that condenses a fiber bundle drafted by a drafting device (1) that includes a delivery roller pair (2). The fiber bundle condensing device includes a nip roller pair (7) disposed downstream of the delivery roller pair (2), a suction pipe (5) disposed upstream of the nip roller pair (7) and downstream of the delivery roller pair (2), and an air-permeable apron (6). A circumferential velocity ratio of a first drive roller (2b) to a second drive roller (7b) is modifiable. The fiber bundle condensing device (3) includes a pressing mechanism (11) configured to press a first driven roller (2a) or a second driven roller (7a) such that the first driven roller (2a) or the second driven roller (7a) is pressed against the first drive roller (2b) or the second drive roller (7b), and against the air-permeable apron (6).