Rotating Drum Magnetic Separator Inversion
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Solution Overview
Problem
Existing magnetic separating apparatuses, such as those disclosed in Patent Document 1, face inefficiencies in separating magnetic and non-magnetic materials due to entrainment of non-magnetic materials with the rotating tubular body, leading to insufficient removal of non-magnetic materials like sand during processes like shot blasting.
Innovation Solution
A magnetic separating apparatus with a rotating drum and a first magnet positioned inside, where the drum rotates in the opposite direction to the falling granular mixture, with a guide plate and conveying mechanism to ensure magnetic materials are attracted and sorted efficiently, reducing entrainment and enhancing separation precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tubular body rotates in the same direction as the falling mixture, then the magnetic material is effectively attracted and sorted, but the non-magnetic material becomes entrained in the magnetic material on the surface of the rotating tubular body, reducing separation precision
Solution Approach 1:
The patent applies inversion by rotating the tubular body in the opposite direction to the falling granular mixture. This reverse rotation prevents non-magnetic material from being entrained on the surface while maintaining effective magnetic material attraction and sorting, thereby resolving the contradiction between productivity and separation precision
2Device complexity
If a rotating tubular body with internal magnet is used for separation, then the structure remains simple, but the non-magnetic material cannot be sufficiently removed due to entrainment
Solution Approach 1:
By inverting the rotation direction of the tubular body to be opposite to the falling direction of the granular mixture, the patent achieves sufficient removal of non-magnetic material without complicating the apparatus structure. The simple rotating tubular body design is maintained while the opposite rotation direction prevents entrainment and improves removal 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 apparatus achieves precise and efficient separation of magnetic and non-magnetic materials by suppressing entrainment and improving recovery efficiency, allowing for effective removal of foreign matter like molding sand in processes like shot blasting.
Implementation Method 1
The first magnet is supported inside the rotating drum, and imparts a magnetic attractive force to a certain area defined by rotation in the opposite direction from a starting point at a sorting area
Implementation Method 2
the shot media and the sand, etc. are sorted while falling in the same direction. Thus, there is a possibility that the sand, etc. will be entrained in the shot media on the surface of the rotating tubular body
Implementation Method 3
The granular mixture supply portion supplies the granular mixture so as to naturally fall
Data Source
AI summary
A magnetic separating apparatus and magnetic sorting method can precisely and efficiently separate magnetic and non-magnetic material with a simple structure. The apparatus includes a granular mixture supply portion that supplies a granular mixture so as to naturally fall; a rotating drum having a part of an outer surface located on a falling path of the granular mixture, the rotating drum being rotationally driven in an opposite direction relative to the falling direction of the granular mixture; a first magnet that imparts a magnetic attractive force to a certain area defined by rotation in the opposite direction with a sorting area as a starting point; a naturally falling area to which the granular mixture that has come into contact with the rotating drum naturally falls; and a conveyed falling area to which the granular mixture naturally falls after being magnetically attracted to and conveyed by the rotating drum.