Crushing Roller Eccentric Bearing Gap Adjustment
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Solution Overview
Problem
Existing crushing devices, particularly compact and larger roll crushers, face challenges in adjusting the geometry of the crushing gap without redesigning the device, leading to high costs and maintenance intensity due to complex components.
Innovation Solution
A crushing device with an eccentrically mounted bearing and a sleeve-shaped receiving device that can rotate relative to the housing, utilizing a biasing element to apply a prestressing force, allowing for adjustable crushing gap without redesigning the device, and featuring a friction insert for overload protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hydraulic adjustment of crushing rolls is used in larger roll crushers, then the crushing gap geometry can be changed, but the device becomes expensive and maintenance-intensive due to large number of components
Solution Approach 1:
The patent extracts the essential function of gap adjustment from complex hydraulic systems by using a simple eccentric mounting mechanism. The bearing is mounted eccentrically on the receiving device, allowing the crushing roll to be displaced radially when the receiving device rotates, thereby changing the crushing gap geometry without requiring hydraulic cylinders, valves, or control systems.
Solution Approach 2:
The receiving device acts as an intermediary mechanism between the housing and the bearing. By rotating the receiving device, the eccentrically mounted bearing displaces the crushing roll, achieving gap adjustment. This simple mechanical intermediary replaces complex hydraulic adjustment systems while maintaining the desired adaptability.
2Ease of manufacture
If compact roll crushers are designed with fixed geometry, then manufacturing cost is reduced, but the crushing gap cannot be changed without redesigning the device
Solution Approach 1:
The patent introduces dynamic adjustability to a previously static system. The receiving device can rotate about the central axis of the housing, causing the eccentrically mounted bearing to displace the crushing roll radially. This dynamic mechanism allows the crushing gap to be adjusted continuously without redesigning the entire device, bridging the gap between fixed-cost manufacturing and flexible operation.
3Ease of operation
If the receiving device can rotate freely, then crushing gap adjustment is easy, but mechanical components may be damaged under overload conditions
Solution Approach 1:
The friction insert is pre-installed between the receiving device and the housing to create a predetermined frictional resistance. This preliminary anti-action prevents the receiving device from rotating freely under all conditions, specifically blocking rotation when overload forces exceed the friction threshold, thereby protecting mechanical components while still allowing normal adjustment operation.
Solution Approach 2:
The friction insert converts potentially harmful uncontrolled rotation under overload into a beneficial protective mechanism. The friction force between the insert and the housing/receiving device creates a self-limiting mechanism that prevents damage while maintaining ease of operation under normal conditions. The friction that could be seen as resistance is actually the protection mechanism.
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
Enables easy adjustment of the crushing gap without redesigning the device, providing overload protection and reducing maintenance by allowing rotation of the receiving device only under specific circumferential forces, thus preventing damage to mechanical components.
Implementation Method 1
A friction insert is arranged between the receiving device and the housing... the frictional force between the housing and the receiving device is increased, so that rotation of the receiving device is made more difficult
Implementation Method 2
The bearing is fitted eccentrically in the receiving device, so that the bearing moves relative to the housing when the receiving device is rotated. In particular, the rotation of the receiving device moves the central axis of the bearing relative to the housing
Data Source
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AI summary
The invention relates to a crushing device (10) for crushing material to be crushed, comprising a housing (12), at least one crushing roller (30), at least one bearing (20) for bearing the crushing roller (30), and at least one substantially sleeve-shaped receiving device (16) arranged between the housing (12) and the bearing (20) in such a way that the receiving device (16) can rotate about its central axis (M2) relative to the housing (12), wherein the bearing (20) is eccentrically mounted in the receiving device (16), such that, via a rotation of the receiving device (16), the bearing (20) moves relative to the housing (12), wherein the crushing device (10) has a pre-tensioning element (38) that is arranged in such a way that it applies the receiving device (16; 36; 56) against the housing (12; 52) with a pre-tensioning force.