Fur Processing Damper Arrangement for Consistent Scraping Pressure
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Solution Overview
Problem
Existing fur processing apparatuses fail to adequately remove fat, tendons, and flesh residues from the skin side of tubular furs, particularly around areas covered by the animal's legs, due to unintentional reduction in contact pressure caused by projections, leading to incomplete scraping.
Innovation Solution
Incorporating a damper arrangement, such as linear shock absorbers, to maintain consistent contact pressure and using multiple scraper rollers with V-shaped elements rotating in the same direction to ensure thorough processing, along with adjustable mandrel speeds to optimize scraping efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If actuators driven via pneumatics or hydraulics are used to apply contact pressure, then the contact pressure can be controlled and applied to the fur on the mandrel, but the actuator may be forced backwards by projections on the fur, causing unintentional reduction of contact pressure
Solution Approach 1:
The patent introduces a damper arrangement between the actuator and the scraper roller to absorb shock impacts before they can affect the contact pressure. The damper acts as a cushioning element that prevents sudden backward movement of the actuator when encountering projections on the fur, thereby maintaining stable contact pressure throughout the scraping process.
2Device complexity
If a single scraper roller is used, then the device complexity is low, but the processing quality is insufficient particularly around skin parts covering the animal's legs
Solution Approach 1:
The patent divides the single scraper roller into multiple scraper rollers arranged in series. Each scraper roller processes a specific section of the fur, with particular emphasis on areas around skin parts that covered the animal's legs. This segmentation allows each roller to focus on specific difficult-to-reach areas, improving overall scraping quality without requiring excessive complexity.
Solution Approach 2:
The patent arranges multiple scraper rollers not only in the longitudinal direction but also in the transverse direction around the mandrel. This multi-dimensional arrangement ensures comprehensive coverage of all fur surfaces, including hard-to-reach areas around leg skin parts, by approaching the processing surface from multiple spatial angles.
3Productivity
If the mandrel rotates at high speed, then the productivity is improved, but the scraping quality deteriorates in areas with projections
Solution Approach 1:
The patent employs multiple scraper rollers arranged in sequence to ensure continuous processing of the fur as it passes through the apparatus. This continuous action across multiple rollers compensates for any momentary quality issues that might occur at high speeds, ensuring that every section of the fur receives adequate scraping attention throughout its passage.
Solution Approach 2:
The patent introduces adjustable mandrel rotation speeds that can be dynamically modified based on the processing requirements. The system allows for variable speed control, enabling optimal speed selection for different fur sections and processing conditions, thereby maintaining both high productivity and consistent scraping quality across all areas.
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 ensures effective removal of residues from difficult areas by maintaining consistent contact pressure and utilizing multiple scraper rollers to cover all fur surfaces efficiently, significantly improving processing speed and quality.
Implementation Method 1
the apparatus is provided with one or more damper arrangements (16) arranged to damp shock impacts towards and/or away from the mandrel (3)
Implementation Method 2
the shock absorption is achieved by the piston compressing a fluid such as a liquid or gas inside the cylinder, which thus absorbs energy from the shock
Implementation Method 3
scraper rollers with a rotational axis that is essentially vertical and is arranged to scrape the fur arranged on the mandrel's side parts by applying an essentially horizontal contact pressure
Data Source
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AI summary
The invention relates to an apparatus (1) for processing the skin side of a tubular fur (2), which apparatus comprises: a tapering mandrel (3) with a first part (3a) that is thinner than a second part (3b) of the mandrel, on which mandrel (3) the tubular fur (2) can be drawn from the first part of the mandrel (3 a) towards the second part of the mandrel (3b) so that the skin side of the fur (2) faces outwards and the fur side of the fur faces inwards towards the mandrel (3), at least a first scraper unit (4) and a second scraper unit (5), each scraper unit comprising at least a first scraper roller (4a, 5 a) which, during operation and in contact with the skin side, is arranged to rotate so that scraping elements (6) on the scraper roller (4a, 5 a) scrape the skin side of the fur (2) on opposite sides of the mandrel (3). The mandrel (3) and the scraper units (4, 5) are arranged to be moved in relation to each other in the longitudinal direction of the mandrel, where the scraper units (4, 5) are arranged to be movable towards and away from the mandrel (3) and comprise a pressure arrangement arranged to apply to said at least one scraper roller (4a, 5a) a contact pressure against the skin side, and where the apparatus comprises a damper arrangement for damping the movement of the scraper units (4, 5) towards and/or away from the mandrel.