Eccentric Roller Crusher Retardation for Uniform Loading
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Solution Overview
Problem
Eccentric roller crushers experience high accelerations and abrupt changes in rotation direction due to inertia and friction, particularly when starting up or encountering large particles, leading to uneven loading and potential damage.
Innovation Solution
Incorporation of a retardation device, such as a non-Newtonian shear-thickening fluid, fluid coupling, magnetic brake, or counter-rocker, to control and reduce rapid movements and accelerations, ensuring uniform loading and reducing mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the roller is allowed to rotate freely on the drive shaft to achieve uniform loading, then the material crushing performance is improved, but high accelerations and abrupt direction changes occur during startup or when encountering large particles
Solution Approach 1:
A retardation device is introduced as an intermediary element between the roller and the drive shaft. This device acts as a mediator that dampens the harmful accelerations and abrupt direction changes while allowing the roller to maintain its free rotation for uniform loading. The retardation device absorbs the shock and reduces the harmful effects without interfering with the primary crushing function.
Solution Approach 2:
The retardation device provides beforehand cushioning by being pre-installed in the system to absorb and dampen high accelerations before they can cause damage. This preventive measure ensures that when the roller starts rotating or encounters large particles, the cushioning effect of the retardation device mitigates the harmful impacts in advance.
2Ease of operation
If the roller rotates parallel to the drive shaft direction during startup to overcome inertia and friction, then the roller can start moving, but this causes abrupt direction changes and high accelerations that may damage the system
Solution Approach 1:
The retardation device is pre-installed to provide cushioning during startup conditions. When the roller attempts to rotate parallel to the drive shaft direction to overcome inertia, the retardation device absorbs the resulting high accelerations and abrupt direction changes, preventing mechanical stress and potential damage while still allowing the roller to start moving.
3Strength
If a retardation device is introduced to brake rapid movements and reduce high accelerations, then mechanical stress and damage are reduced, but the device complexity increases
Solution Approach 1:
The patent employs a fluid coupling as the retardation device, utilizing hydraulic principles to provide the braking effect. The fluid coupling uses the viscosity and inertia of the fluid to dampen rapid movements and reduce high accelerations. This approach provides effective protection against mechanical stress while maintaining relatively simple construction, as the fluid coupling integrates seamlessly into the existing bearing structure without requiring complex mechanical braking mechanisms.
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
The retardation devices effectively manage high accelerations and direction changes, preventing damage and ensuring uniform material crushing by maintaining stable rotational speeds and forces.
Implementation Method 1
the retardation device exhibits a non-Newtonian shear-thickening fluid. For example, the fluid is arranged between two round bearings that are arranged between the drive shaft and the roller. Shear tension increases with increasing shear velocity, so that as a result high speeds can be avoided.
Implementation Method 2
the retardation device exhibits a fluid coupling, particularly preferably a viscous coupling, also known as a turbo coupling. The braking effect can therefore be adjusted by the viscosity of the fluid, particularly the liquid, used as a fluid.
Implementation Method 3
the retardation device is a magnetic brake. In particular, eddy currents are generated by a magnet, which then generate the braking effect. To do this, the magnets may be arranged for example and preferably on the crusher housing, so that they generate eddy currents in the roller.
Implementation Method 4
The eccentric bearing is usually achieved in that the drive shaft exhibits a thickening in the region of the roller, wherein although the thickening exhibits a round cross-section, its axis of symmetry, however, is offset to the side outside the region of the roller, compared with the axis of symmetry.
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The present invention relates to an eccentric roller crusher 10 with a crusher housing 60, a drive shaft 20, a roller 30 supported eccentrically and rotatably on the drive shaft 20, and a rocker 40, characterised in that between the drive shaft 20 and the roller 30 or between the roller 30 and the crusher housing 60, a retardation device is arranged.