Bed Roller Mill Leveling Mechanism for Vibration Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Horizontal roll mills face reduced service life due to vibrations caused by uneven material distribution and pressure variations, especially in dry grinding processes where liquid is not used to standardize the material bed, leading to mechanical stresses and heterogeneous particle size distribution.
Innovation Solution
Incorporating a leveling roller upstream of the grinding roller to equalize the material bed surface pressure, with the leveling roller held close to but not in contact with the rolling track, ensuring a lower pressure than the grinding roller and maintaining a consistent bed thickness, allowing the material to pass under both rollers during each rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a horizontal roller crusher is used for dry grinding of mineral materials, then the grinding process can be implemented without liquid, but the material bed surface becomes uneven and heterogeneous particle size distribution occurs
Solution Approach 1:
The leveling roller is positioned upstream of the grinding roller to perform preliminary action on the material bed. It levels the surface of the material bed before the grinding roller processes it, ensuring uniform thickness and distribution of material throughout the grinding zone. This preliminary leveling action prevents heterogeneous particle size distribution by creating consistent material flow and bed conditions prior to grinding.
2Productivity
If the grinding roller applies strong pressure on the material bed, then crushing efficiency is improved, but mechanical stresses increase and service life of components is reduced
Solution Approach 1:
The leveling roller performs preliminary action by distributing material uniformly and leveling the bed surface before the grinding roller applies strong pressure. This preliminary distribution ensures that the high pressure from the grinding roller is applied more evenly across the material bed, reducing localized mechanical stresses and vibrations that would otherwise reduce component service life.
3Adaptability or versatility
If the material bed thickness varies, then the constitution of material bed changes, but this induces vibrations and mechanical stresses in the mill
Solution Approach 1:
The leveling roller acts as an intermediary element between the material feed and the grinding roller. It mediates the material flow by leveling the surface and ensuring uniform thickness distribution, thereby preventing the variations in bed constitution that would otherwise cause vibrations and mechanical stresses in the mill structure.
4Device complexity
If no leveling device is used, then the device complexity is reduced, but the surface of the material bed remains uneven leading to heterogeneous grinding
Solution Approach 1:
The leveling roller provides a simple preliminary action by rotating close to the material bed surface without contact, using its rotational motion to level and distribute the material. This simple mechanical action effectively uniformizes the material bed surface without requiring complex leveling mechanisms or multiple components.
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 service life of the mill by reducing mechanical stresses and maintaining a uniform material bed, thereby improving the grinding process efficiency and reducing vibrations, particularly in dry grinding applications.
Implementation Method 1
the said equalizing roller exerting on the bed of materials a pressure which equalizes its surface
Implementation Method 2
means for applying said crushing roller against the running track of said cylinder
Implementation Method 3
means for holding the leveling roller close to and at a distance from the rolling track of said cylinder, preventing any contact between said equalizing roller and the rolling track
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a compressive grinder (1) for a bed of materials (5), including: a cylinder (2) which has a horizontal axis (A), and the inner wall of which comprises a raceway for a grinding roller (3) arranged inside said cylinder (2); a means for rotating the cylinder about the axis (A) thereof; said grinding roller (3), which has an axis that is parallel to the axis (A) of the cylinder (2); a means for urging said grinding roller (3) against the raceway of said cylinder (2); and an input for supplying material to be ground at one end of said cylinder (2) and an outlet for the ground material at the other end of said cylinder (2). According to the invention, the grinder includes: a smoothing roller (4) arranged upstream from said grinding roller (3) in the direction of rotation (R) of said cylinder (2); a means for keeping the smoothing roller (4) adjacent to and separated from the raceway of said cylinder (2), such that, upon each turn of the cylinder (2), the material consecutively passes under the smoothing roller (4) and then under the grinding roller (3), said smoothing roller (4) exerting, on the bed of materials (5), a pressure that smoothes the surface thereof, said pressure being lower than the pressure (P) exerted by said grinding roller (3) on said bed of materials (5).