Modular Sieve Stack Drives for Compact Cereal Fractionation
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Solution Overview
Problem
Existing plansifters for fractionating ground cereal products face challenges with space requirements, limited adaptability, over-dimensioned drives, and high mechanical stress due to central drive modules, which affect efficiency and flexibility.
Innovation Solution
A machine with multiple sieve stack pairs, each paired with a drive module containing an electric motor and eccentrically positioned inertial weight, allowing for synchronized oscillations without a central drive unit, minimizing force loads and enabling flexible configuration of sieve stacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a central drive module with an inertial weight is used between rows of sieve boxes, then the sieve boxes can be brought into oscillatory movement, but a considerable space requirement is entailed
Solution Approach 1:
The invention divides the drive system into individual drive units, each assigned to a specific sieve box rather than using a single central drive module. Each drive unit includes its own inertial weight and drive mechanism, allowing distributed oscillation generation across multiple sieve boxes without requiring a large central space for a single powerful drive.
2Power
If a central drive module is used, then the sieve boxes can be driven, but the drive is over-dimensioned for many application situations and adaptability is limited
Solution Approach 1:
The invention enables dynamic configuration where the number and arrangement of drive units can be adapted to match the actual number of sieve boxes required. Each sieve box can be independently equipped with a drive unit, allowing the system to be scaled up or down without being constrained by an over-dimensioned central drive designed for maximum capacity.
3Power
If a central inertial weight is used, then the sieve boxes can be oscillated, but considerable forces are exerted upon the mounting and demands are high
Solution Approach 1:
The invention segments the inertial weight into multiple smaller inertial weights, each associated with an individual drive unit. This distribution reduces the mechanical stress on any single mounting point compared to a central inertial weight, while still providing sufficient oscillation force for each sieve box through its dedicated drive unit.
4Adaptability or versatility
If each sieve compartment is provided with an individual drive, then flexible arrangement is permitted, but the power capability is limited and the design becomes cumbersome
Solution Approach 1:
The invention uses modular drive units that can be independently attached to each sieve box, providing the flexibility of individual drives while maintaining a standardized, simplified design through repetition of the same modular component across all sieve boxes.
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 reduces mechanical stress on bearings, optimizes energy consumption, and allows for a compact, adaptable design with adjustable sieve configurations, enhancing efficiency and flexibility.
Implementation Method 1
an inertial weight which can be driven by this into a rotatory movement, i.e. a mass which is arranged eccentrically with respect to the rotation axis of the rotation movement
Implementation Method 2
a mass which is arranged eccentrically with respect to the rotation axis of the rotation movement
Implementation Method 3
These are brought into horizontally oscillatory movements, in particular into circular oscillations in the sieve plane
Implementation Method 4
for the separation of constituents of a ground product into coarse or finer grained constituents and under certain circumstances also into constituents of different densities
Data Source
AI summary
A machine for fractionating ground cereal products includes a plurality of sieve stack pairs which are arranged next to one another, each with an upper sieve stack and a lower sieve stack. A drive module that includes an electric motor and an inertial weight which can be driven by this into a rotation movement is assigned to the sieve stack pairs. The drive module is arranged between the upper and the lower sieve stack of the respective sieve stack pair. The upper sieve stack pair and the lower sieve stack can be roughly equally large, i.e. the number of sieves of the upper sieve stack and of the lower sieve stack can be roughly equal or differ for example by maximally 50% or maximally 30%.