Agitating Ball Mill Spiral Separator Design
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Solution Overview
Problem
In agitating ball mills, auxiliary grinding bodies often enter the grinding stock outlet during start-up and run-down phases due to the short distance they need to cover between arc-shaped conveying elements, leading to inefficient separation, especially with smaller grinding bodies.
Innovation Solution
A cylindrical agitating ball mill with a separating device featuring at least one spiral, which extends 360° around the agitating shaft, ensures secure separation of auxiliary grinding bodies from the grinding stock by utilizing spirals with varying or constant distances, friction retention, and independent rotation to enhance throughput and prevent backflow, with features like inclined slot-shaped openings and agitating elements for efficient product outflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If arc-shaped conveying elements are used in the separating device, then the structure is simple, but auxiliary grinding bodies enter the grinding stock outlet during start-up and run-down phases
Solution Approach 1:
The separating device is segmented into multiple spiral elements arranged in series, creating multiple separation stages. Each spiral contributes to retaining auxiliary grinding bodies through friction, and the combined effect of multiple spirals provides reliable separation even during dynamic phases when arc-shaped elements fail.
Solution Approach 2:
The separating device incorporates rotational motion of the spirals to enhance separation effectiveness. The rotating spirals create dynamic friction retention forces that adapt to the flow conditions during start-up and run-down phases, preventing auxiliary grinding bodies from entering the outlet while maintaining simple structural principles.
2Area of stationary object
If the distance between conveying elements is short, then the device size is compact, but auxiliary grinding bodies cannot be retained during start-up and run-down phases
Solution Approach 1:
The invention transitions from a single-plane arc-shaped element design to a multi-dimensional spiral configuration. The spirals extend along the longitudinal axis of the grinding chamber, creating separation action in multiple spatial dimensions. This dimensional change allows effective retention of auxiliary grinding bodies within a compact footprint by utilizing the longitudinal dimension for friction retention.
3Reliability
If spiral separating device is used, then separation effectiveness is improved, but device complexity increases
Solution Approach 1:
The spiral elements serve multiple functions simultaneously: they create friction retention forces to hold auxiliary grinding bodies, guide the flow of grinding stock, and can be rotated to enhance separation during dynamic phases. This multi-functionality achieves reliable separation without proportionally increasing device complexity, as a single spiral structure performs multiple separation tasks.
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 spiral-based separating device effectively prevents auxiliary grinding bodies from entering the grinding stock outlet, ensuring secure separation and increased throughput, even with smaller grinding bodies, by utilizing friction retention and optimized flow directions, reducing wear and improving product outflow efficiency.
Implementation Method 1
the spiral directly extends with its radially inner end as far as the grinding stock outlet... auxiliary grinding bodies among themselves are retained by friction
Data Source
AI summary
Agitating ball mill with a cylindrical grinding vessel comprising at least one grinding stock inlet and at least one grinding stock outlet wherein in the grinding vessel an agitating shaft connected with a drive is arranged which transmits a part of the drive energy to auxiliary grinding bodies which are loosely arranged in the grinding vessel and a separating device arranged in front of the grinding vessel outlet.