Vertical Roller Mill Feeding Device for Bed Height Control

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Solution Overview

Problem

Vertical roller mills experience vibrations and reduced grinding efficiency due to uneven grinding bed heights and material distribution, which existing technologies have not adequately addressed.

Innovation Solution

A feeding device that allows for the selective adjustment of grinding bed height over the width of the grinding roller, using multiple slides that can be set to varying heights and orientations to optimize bed height based on operational modes, such as maximum throughput or energy efficiency, and includes a control system to adjust bed height dynamically based on operating parameters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a uniform grinding bed height is formed using conventional feeding devices, then the grinding bed can be maintained at a consistent level, but vibrations occur and grinding efficiency decreases

Engineering Contradiction:

Improvegrinding bed height uniformityVSAvoidgrinding efficiency

Core Design Contradiction:

Stability of the object's compositionVSProductivity

Solution Approach 1:

The feeding device is divided into multiple independent feeding zones along the grinding roller width, with each zone having adjustable height control. This segmentation allows different sections of the grinding bed to be optimized independently, preventing vibrations while maintaining high grinding efficiency in each zone.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The feeding device incorporates dynamic height adjustment capabilities, allowing the grinding bed height to be varied along the width of the grinding roller. This dynamic configuration enables optimization of material distribution and bed height to eliminate vibrations without sacrificing grinding efficiency.

Inventive Principle:

Principle #15Dynamics

2Object-affected harmful factors

If the grinding bed height is increased to reduce vibrations, then vibration levels decrease, but grinding efficiency is compromised

Engineering Contradiction:

Improvevibration levelVSAvoidgrinding efficiency

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

Different sections of the grinding bed are assigned different optimal heights based on local grinding requirements. The feeding device adjusts height locally in each zone rather than uniformly across the entire width, reducing vibrations in specific areas without compromising overall grinding efficiency.

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If a high grinding bed is used to minimize vibrations, then vibration levels are reduced, but energy consumption increases and grinding efficiency decreases

Engineering Contradiction:

Improvevibration levelVSAvoidenergy consumption

Core Design Contradiction:

Object-affected harmful factorsVSUse of energy by moving object

Solution Approach 1:

The feeding device dynamically adjusts grinding bed height along the width of the grinding roller, allowing the system to maintain optimal energy efficiency while reducing vibrations. This dynamic adjustment prevents the need for uniformly high grinding beds that consume excessive energy.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10052635B2Comminution of grinding stock in a vertical roller mill

Publication Date: 2018.08.21 THYSSENKRUPP POLYSIUS GMBH

AI summary

In the method according to the invention for the comminution of grinding stock in a vertical roller mill, the grinding stock is fed upstream of at least one grinding roller in order to form a grinding bed and is comminuted between a grinding table and the at least one grinding roller, the grinding bed which is being formed being settable at a differing height over the width of the grinding roller by means of a feeding device.