Hydropneumatic Roller Mill Rocker Arm Force Transmission
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Solution Overview
Problem
Existing roller mills with vertical mill axes face challenges in generating high forces required for efficient grinding, especially in large mills with high throughputs, and struggle to easily adjust forces for varying operating conditions.
Innovation Solution
The roller mill design incorporates a hydropneumatic spring system with a rocker arm having a tilting axis parallel to the grinding roller axis, mounted outside the mill housing, which allows for increased force generation and easy adjustment by diverting forces into the mill foundation, eliminating the need for housing reinforcement and reducing vibration issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If mechanical spring systems are used to press grinding rollers against the grinding track, then the structure is simple and easy to manufacture, but the forces generated are insufficient for high-throughput mills
Solution Approach 1:
The patent applies hydropneumatic spring systems instead of mechanical spring systems to generate grinding forces. The hydropneumatic spring (18) uses fluid pressure to generate significantly higher forces compared to mechanical springs, enabling efficient grinding in high-throughput mills while maintaining structural feasibility.
Solution Approach 2:
The patent replaces the mechanical spring system with a hydropneumatic system. The mechanical spring (17) is supplemented or replaced by a hydropneumatic spring (18) that uses hydraulic or pneumatic pressure to generate the required grinding forces, transitioning from purely mechanical to fluid-based force generation.
2Force
If high forces are introduced into the mill housing to press grinding rollers, then efficient grinding is achieved, but housing reinforcements are required and vibration problems occur
Solution Approach 1:
The patent extracts the force transmission path from the mill housing by introducing rockers (6) that pivot on axes (8) extending beyond the housing. The grinding forces are transmitted through these external rockers directly to the foundation, bypassing the housing structure and eliminating the need for housing reinforcements.
Solution Approach 2:
The rocker arms serve as intermediary elements between the hydropneumatic spring system and the foundation. They transmit the grinding forces generated by the hydropneumatic springs directly to the foundation through their pivot points, acting as mediators that prevent force transmission through the housing.
3Adaptability or versatility
If mechanical spring systems are used for force generation, then the system is simple, but the forces cannot be easily adjusted for different operating conditions
Solution Approach 1:
The patent implements a dynamic force adjustment system where the hydropneumatic spring pressure can be varied to change the grinding forces. The system transitions from fixed mechanical spring forces to dynamically adjustable hydraulic/pneumatic pressures, allowing adaptation to different operating conditions.
Solution Approach 2:
The patent changes the physical parameter of force generation from mechanical spring compression to hydraulic/pneumatic pressure. This allows continuous adjustment of the grinding forces by varying the fluid pressure, providing adaptability to different operating conditions while using a relatively simple hydropneumatic system.
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 enables the realization of high grinding forces efficiently, even in high-throughput mills, allowing for adjustable cylinder forces and minimizing housing costs and vibrations, while maintaining geometric stability and optimizing force distribution.
Implementation Method 1
at least one hydropneumatic spring system (8) which is in active contact with the rocker arm (6) for setting the contact pressure of the grinding roller (4)
Implementation Method 2
at least one hydropneumatic spring system (8) which is in active contact with the rocker arm (6) for setting the contact pressure of the grinding roller (4)
Implementation Method 3
the oscillating lever (6) is mounted at a distance from the mill housing (1) in such a way that the forces generated by the pressure system are dissipated into the mill foundation (11) directly or via pylons (9, 10)
Data Source
Figure 1a
Figure 1b
Figure 2a
AI summary
The invention relates to a roller mill comprising a mill housing, a milling track rotatably supported about a milling axis inside the mill housing, and at least one milling roller, which can be rotated about a milling roller axis and is in rolling engagement with the milling track. Furthermore, an oscillating arm is provided for the rotatable mounting of the milling roller, the arm having a tilt axis, which is disposed parallel to the milling roller axis and is supported outside the mill housing. In addition, the oscillating arm is in operative contact with a hydropneumatic spring system in order to adjust the contact pressure of the milling roller. The oscillating arm is supported outside the milling housing at a distance thereto such that the forces produced by the hydropneumatic spring system are transferred directly, or via pylons, into the mill foundation.