Eccentric Side Lever Force Transmission for Grinding Roller
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Solution Overview
Problem
Existing lever systems for grinding rollers in vertical mills are costly, labor-intensive to install and maintain, and prone to damage due to high compressive forces and complex hydropneumatic spring systems, with limited accessibility and ease of dismantling.
Innovation Solution
The system replaces the traditional rocking lever fork with an eccentrically arranged side lever and a hydraulic cylinder positioned on a concrete pedestal, allowing perpendicular force application and easier maintenance, with a separate hydraulic swing cylinder for vertical positioning of the grinding roller, and simplifies the bearing and piping arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cast rocking lever fork is used for force transmission onto the grinding roller, then the structural strength is sufficient to handle high compressive forces, but the manufacturing cost and complexity increase significantly
Solution Approach 1:
The rocking lever fork is divided into two separate components: a rocking lever and a side lever. The rocking lever is supported on a rocking lever axis, while the side lever is arranged eccentrically on the rocking lever and connects to the hydraulic cylinder. This segmentation allows each component to be manufactured separately using simpler, more cost-effective methods while maintaining the overall structural strength through proper design of the individual parts and their connections.
2Force
If the hydraulic cylinder applies tensile forces onto the rocking lever to increase compressive forces onto the grinding roller, then the grinding force is sufficient, but cracks and fractures appear in the rocking lever
Solution Approach 1:
The force transmission path is segmented by introducing a side lever that is firmly attached to the rocking lever. The hydraulic cylinder applies forces to the side lever, which then transmits these forces to the rocking lever through a controlled connection. This segmentation allows the side lever to absorb and distribute the tensile forces, preventing direct stress concentration on the rocking lever that would cause cracks and fractures.
Solution Approach 2:
The side lever acts as an intermediary component between the hydraulic cylinder and the rocking lever. It mediates the force transmission by receiving tensile forces from the hydraulic cylinder and transferring them to the rocking lever in a manner that avoids creating harmful stress concentrations, thus preventing cracks and fractures while still achieving the required compressive force on the grinding roller.
3Stability of the object's composition
If the rocking lever fork is integrated into a steel mill stand, then the structural stability is ensured, but the accessibility and ease of maintenance deteriorate
Solution Approach 1:
The lever system components (rocking lever, side lever, hydraulic cylinder) are designed as separate, modular units that can be accessed and maintained independently. The rocking lever axis is supported on a bearing pedestal, and the hydraulic cylinder is positioned to allow easy access for maintenance activities. This modular segmentation maintains structural stability through proper support and connection design while significantly improving accessibility for maintenance and repair operations.
4Productivity
If the rocking lever fork is designed as a single integrated component, then the force transmission is efficient, but the dismantling and reassembly require considerable work including drilling out the rocking lever axis
Solution Approach 1:
The force transmission function is distributed across multiple separate components (rocking lever, side lever, hydraulic cylinder) rather than being integrated into a single monolithic structure. The side lever is firmly attached to the rocking lever through a design that allows for easy detachment without requiring drilling out the rocking lever axis. This segmentation maintains efficient force transmission through proper mechanical connections while enabling quick dismantling and reassembly for maintenance purposes.
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 design reduces costs, simplifies installation and maintenance, minimizes the risk of structural damage, and allows for easier modification of grinding forces, enhancing the overall efficiency and reliability of the mill operation.
Implementation Method 1
the piston rod of the hydraulic cylinder can act in a substantially perpendicular manner onto the end of the lever arm of the side lever facing away from the grinding roller
Implementation Method 2
an eccentrically arranged side lever having a lever arm which extends in the opposite direction to the grinding roller
Implementation Method 3
provision is made for the rocking lever axis and the hydraulic cylinder on a bearing pedestal
Data Source
AI summary
The invention relates to a lever system for force transmission for a grinding roller. A more cost-efficient, simplified lever system is to be created which no longer requires the integration into a mill stand but is more easily accessible for installation and maintenance works. For this purpose, provision is made in particular in that on the central rocking lever of the grinding roller an eccentrically arranged side lever is provided which has a lever arm extending in the opposite direction to the grinding roller and in that the force transmission onto rocking lever and grinding roller takes place via a lever arm of the side lever and a piston rod of the hydraulic cylinder.