Magnetic Separation of Elongate Magnetizable Objects by Length
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Solution Overview
Problem
Existing screening devices struggle to effectively separate elongate magnetizable objects from material streams by length due to the small size of the chips, which allows them to pass through the screen meshes, resulting in a low-quality monostream.
Innovation Solution
A device comprising a homogeneous magnetic field, a transport device, and a separating device with take-up elements that align with the magnetic field direction, allowing elongate magnetizable objects to be separated by length through magnetic alignment and mechanical pickup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a screening device is used to separate elongate chips by length, then separation of magnetizable objects can be achieved, but a large part of the elongate chips will pass through the screen meshes resulting in low separation quality
Solution Approach 1:
The patent replaces the mechanical screening system with a magnetic field-based separation system. A homogeneous magnetic field is applied perpendicular to the transport direction, causing elongate magnetizable chips to align with the field lines. Take-up elements traveling through the field zone mechanically pick up these aligned chips, achieving precise length-based separation without chips passing through meshes.
Solution Approach 2:
The patent changes the separation mechanism from mechanical filtration (screen mesh size) to magnetic field interaction. By adjusting the magnetic field strength and homogeneity, and controlling the take-up element position and speed, the system achieves precise separation of elongate chips based on their alignment behavior in the magnetic field, eliminating the problem of chips passing through screens.
2Productivity
If the take-up element travels close to the transport surface, then effective pickup of aligned objects is achieved, but interference with the material stream may occur
Solution Approach 1:
The patent applies the magnetic field locally in a specific field zone above the transport surface, creating a controlled region where chip alignment occurs. The take-up element travels through this localized field zone at a controlled distance from the transport surface, allowing it to pick up aligned chips without interfering with the overall material stream on the conveyor belt.
Solution Approach 2:
The magnetic field acts as an intermediary between the take-up element and the elongate chips. The field causes the chips to align and become magnetically susceptible, enabling the take-up element to selectively pick up aligned chips without direct contact with the material stream, thus avoiding interference while maintaining high separation efficiency.
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 device efficiently separates elongate magnetizable objects by length, ensuring high-quality separation with minimal overlap and interference, thereby refining the material stream effectively.
Implementation Method 1
a magnetic field, which magnetic field is homogeneous in a field zone; a transport device with a transport surface for carrying the material stream through the field zone in a transport direction, wherein the field direction in the field zone is oriented at right angles to the transport direction
Data Source
AI summary
The invention relates to a device for separating elongate magnetizable objects from a material stream by length. The device includes a magnetic field, which magnetic field is homogeneous in a field zone; a transport device with a transport surface for carrying the material stream through the field zone in a transport direction, wherein the field direction in the field zone is oriented at right angles to the transport direction; and a separating device for carrying the elongate magnetizable objects separated by length out of the field zone in a separation direction, which separating device includes at least one take-up element which travels a path running at least partially through the field zone. In the path in the field zone the minimum distance between the at least one take-up element and the transport surface is a first distance which is smaller than or equal to the greatest main dimension of a cross-section of the field zone parallel to the transport surface. The invention also relates to a method for separating elongate magnetizable objects from a material stream by length.