Defibrating Device Magnet Unit for Metal Fragment Removal
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Solution Overview
Problem
Existing paper recycling systems face challenges in effectively separating and removing metal fragments from fibrous materials during the defibration process, leading to potential damage to equipment and contamination in the recycling process.
Innovation Solution
A defibrating device equipped with a magnet unit positioned in the swirl section to attract and remove metal fragments using a rotational current, ensuring they do not enter the defibration section, combined with a discharge-side magnet unit to capture any remaining metal fragments, thereby preventing equipment damage and ensuring high-quality sheet production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic separator is used to select and separate metal from material conveyed by air current, then metal can be removed from the fibrous material, but it is difficult to sufficiently remove metal fragments when they are conveyed by air current
Solution Approach 1:
The patent applies preliminary action by introducing a swirl section that creates rotational flow to concentrate metal fragments onto the magnet unit before the main defibration process. This preliminary concentration action makes the subsequent magnetic separation much more effective, as metal fragments are pre-positioned near the magnet rather than being dispersed in the air current.
Solution Approach 2:
The swirl section acts as an intermediary mechanism between the air current conveying metal fragments and the magnet unit. It mediates the separation process by using rotational flow to transport and concentrate metal fragments onto the magnet surface, enabling effective magnetic separation that would be difficult to achieve directly from dispersed air current.
2Productivity
If metal fragments are not removed from fibrous material, then the defibrating device can operate continuously, but metal fragments cause damage to parts of the defibrating device
Solution Approach 1:
The magnet unit performs preliminary removal of metal fragments before they can reach and damage the defibration section components. By positioning the magnet unit in the swirl section where metal fragments are concentrated, the system proactively eliminates harmful metal fragments before they cause equipment damage, enabling continuous operation.
Solution Approach 2:
The patent converts the harmful effect of metal fragments into a beneficial separation process. The swirl section's rotational flow, which could potentially cause wear, is instead utilized to concentrate and transport metal fragments onto the magnet unit for removal. The harmful metal fragments become the target of a beneficial magnetic separation mechanism.
3Reliability
If a magnet unit is disposed in the swirl section to attract metal fragments, then metal fragments can be removed effectively, but the device complexity increases
Solution Approach 1:
The magnet unit serves multiple functions: it removes metal fragments from the material stream, protects downstream equipment, and can be integrated into the existing swirl section structure. This multi-functionality justifies the added complexity by providing several benefits from a single component addition.
Solution Approach 2:
The magnet unit is designed to be self-contained and require minimal maintenance. It automatically attracts and holds metal fragments without requiring external control systems or complex mechanisms, allowing the system to self-regulate the metal removal process with simple passive magnetic attraction.
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 separates metal fragments from fibrous materials, preventing equipment damage and ensuring high-quality sheet production by reliably removing contaminants, thus enhancing the recycling process efficiency and product quality.
Implementation Method 1
having a magnet that attracts by magnetic force metal fragments conveyed with the fibrous material to the swirl section
Implementation Method 2
a swirl section configured to produce a rotational current, and by the rotational current cause the fibrous material to rotate and flow into the defibration section
Implementation Method 3
Centrifugal force produced by this rotation acts pushes the fibrous material and metal fragments away from the axis of rotation, that is, to the inside circumference side of the of the cylinder part defining the swirl section
Data Source
AI summary
A defibrating device and sheet manufacturing apparatus attract and remove metal fragments when metal fragments are mixed with fibrous material. A defibrating device has a main unit with a defibration section configured to defibrate fibrous material, and a swirl section configured to produce a rotational current, and by the rotational current cause the fibrous material to rotate and flow into the defibration section. The main unit has a magnet unit that is disposed to the swirl section, and has a magnet that attracts by magnetic force metal fragments conveyed with the fibrous material to the swirl section.