Fiber Cleaner Feed Roller Design to Eliminate Channel Blockages
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Solution Overview
Problem
Existing devices for cleaning fiber material experience disturbances and blockages due to friction and air currents within channels, leading to incomplete separation and transfer issues from the condenser to the cleaner.
Innovation Solution
A device with a pneumatic feed system using a rotatably mounted air-permeable sieve drum and a feed roller with radially projecting ribs, ensuring close proximity to the cleaning roller for efficient material transfer without additional channels, and optimizing rotation speeds and diameters for continuous and trouble-free fiber material flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a funnel-shaped channel is used to bring fiber material together from the feed roller to the cleaner inlet nozzle, then the fiber material can be concentrated onto the inlet nozzle cross-sectional area, but disturbances occur within the channel causing deposits and blockages due to friction on inner walls and undesired air currents
Solution Approach 1:
The invention removes the problematic funnel-shaped channel from the system entirely. Instead of transporting fiber material through a channel with inner walls that cause friction and blockages, the fiber material is transferred directly from the feed roller to the cleaner inlet nozzle in open space, eliminating the source of disturbances and blockages while maintaining transfer efficiency.
2Device complexity
If the feed roller is positioned close to the cleaning roller with a distance of 30 mm to 250 mm, then direct transfer of fiber material is achieved without additional channels, but the fiber material must be effectively stripped from the screen drum
Solution Approach 1:
The invention applies local quality by positioning the feed roller with radially projecting ribs at a specific location close to the screen drum (distance less than 1.0 mm) only in the stripping zone, while maintaining a larger distance (30-250 mm) to the cleaning roller for direct transfer. The ribs provide localized mechanical action for effective stripping without requiring complex additional components.
3Manufacturing precision
If the feed roller with radially projecting ribs is positioned less than 1.0 mm from the screen drum surface, then complete scraping of fiber material is guaranteed, but the structure requires precise positioning and the ribs must be sufficiently long
Solution Approach 1:
The invention employs dynamics by making the feed roller rotatable, allowing the radially projecting ribs to dynamically engage with the screen drum surface during rotation. This dynamic interaction ensures complete scraping of fiber material through continuous contact and mechanical action, while the rotational movement itself provides the necessary positioning precision without requiring complex static positioning mechanisms.
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
Ensures complete scraping of fiber material, prevents air from reaching the cleaner, and facilitates direct, trouble-free transfer from the condenser to the cleaner, reducing blockages and ensuring continuous productivity.
Implementation Method 1
A negative pressure is applied inside the screening drum, which is generated by a negative pressure source. As a result, the fiber material fed to the screening drum is sucked onto the surface of the screening drum and deposited on it. During this process, the fiber material and the transport air are separated.
Implementation Method 2
A distance of less than 1.0 mm is provided between the outer surface of the screening drum and the enveloping circle of the feed roller. This makes it possible that due to the proposed small distance between the surface of the screen drum and the ribs of the feed roller, complete scraping of the fiber material is guaranteed
Implementation Method 3
During the transport of the fibrous material through the cleaner, it repeatedly passes through a grate below the cleaning roller, through which impurities are separated from the fibrous material under the influence of impact pins attached to the cleaning roller and under the influence of centrifugal force.
Data Source
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AI summary
The invention relates to a device for cleaning fiber material (2) with a cleaner (1) having a cleaning roller (3) and a cleaner housing (22) and a condenser (4) arranged above the cleaner (1) and a pneumatic feed of the fiber material (2) with transport air (9). The condenser (4) has an air-permeable sieve drum (5) rotatably mounted in a sieve drum housing (14) and a feed roller (6) rotatably mounted in a feed roller housing (18), each with a longitudinal axis (7, 8). The feed roller (6) is arranged between the sieve drum (5) and the cleaning roller (3) and the fibrous material (2) is guided with the transport air (9) onto an outer surface (10) of the sieve drum (5). The fiber material (2) and transport air (9) are separated by the screening drum (5), an interior (25) of the screening drum (5) being connected to a vacuum source (29). On its circumference, the feed roller (6) has radially projecting ribs (11) in the direction of the longitudinal axis (8) with outer ends (15) which form an enveloping circle (13). A distance (a) of less than 1.0 mm is provided between the outer surface (10) of the sieve drum (5) and the enveloping circle (13) of the feed roller (6). A distance (b) between the enveloping circle (13) of the feed roller (6) and a surface (16) of the cleaning roller (3) is 30 mm to 250 mm.