Gyratory Sifter Inlet with Sloped Scalping Screen and Pan

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Solution Overview

Problem

Gyratory sifters often operate at suboptimal efficiency due to uneven material distribution across the screen surface, leading to underutilization of screen areas and reduced sorting effectiveness.

Innovation Solution

The introduction of a housing inlet with a scalping screen sloped downward in a specific direction and a pan positioned below it, sloped in a different direction, along with a spreader mechanism that distributes material evenly across the screen width, ensuring that the material flows consistently and efficiently through the screening process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If vibration is applied to spread material across the screen surface, then material distribution should improve, but the material does not spread across the full width of the screen resulting in underutilization

Engineering Contradiction:

Improvescreen utilization efficiencyVSAvoidmaterial distribution uniformity

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The screen surface is divided into multiple zones with different slope angles. The upstream portion has a steeper slope to promote material movement, while the downstream portion has a gentler slope to prevent material from reaching the edges and falling off. This segmentation allows different regions to perform different functions, improving overall material distribution across the screen width.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the screen surface are given different local properties through varying slope angles. The upstream area has a steeper slope to accelerate material movement, while the downstream area has a gentler slope to control material discharge. This local quality variation optimizes material flow characteristics in different regions.

Inventive Principle:

Principle #3Local quality

2Productivity

If the screen surface is tilted to increase particle passage rate, then turnover improves, but material may not be evenly distributed across the full screen width

Engineering Contradiction:

Improveparticle turnover rateVSAvoidmaterial spread uniformity

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The slope angle parameter is varied across different portions of the screen surface. By changing this geometric parameter from uniform to variable, the system optimizes both material movement speed and distribution uniformity, resolving the contradiction between turnover rate and spread uniformity.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If material is concentrated in the center of the screen, then sorting effectiveness is reduced, but spreading material to full width increases device complexity

Engineering Contradiction:

Improvesorting effectivenessVSAvoidmaterial distribution mechanism

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The screen surface itself performs the material distribution function through its variable slope geometry. The upstream steep slope naturally propels material outward, while the downstream gentle slope prevents edge accumulation. This self-service approach eliminates the need for additional mechanical distribution devices, maintaining simplicity while achieving full width utilization.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Instead of adding complex lateral distribution mechanisms, the solution exploits the vertical dimension by varying the slope angle across the screen surface. This dimensional approach to material distribution avoids increasing device complexity while achieving effective full-width utilization.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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

This configuration enhances the even distribution of material across the screen surface, increasing the operational efficiency of the gyratory sifter by utilizing the full width of the screens and improving the sorting of materials into distinct output fractions.

Implementation Method 1

The housing inlet includes a scalping screen sloped downward in a first direction. The housing inlet also includes a pan positioned at least partially below the scalping screen. The pan is sloped downward in a second direction that is different than the first direction.

Methodology Applied

Scientific EffectGravity: Gravitation

Implementation Method 2

Gyratory equipment may include a system of eccentric weights. For example, a gyratory sifter may include a top weight and a bottom weight. The top weight may be coupled to a motor, which rotates the top weight in a plane that is close to the center of the mass of assembly. This may cause vibration and movement of the screens in the horizontal plane

Methodology Applied

Scientific EffectVibration: Vibration

Data Source

PatentUS11292031B2Inlet door scalping screen

Publication Date: 2022.04.05 SCHLUMBERGER TECH CORP

AI summary

A housing inlet for a sifter includes a scalping screen sloped downward in a first direction. The housing inlet also includes a pan positioned at least partially below the scalping screen. The pan is sloped downward in a second direction that is different than the first direction.