Split Shaft Roller Grinder With Wedge Expansion Ring
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Solution Overview
Problem
Existing roller grinder systems face challenges with the mounting and dismounting of grinding shells, leading to high costs due to wear and damage, particularly when using thermal expansion-contraction methods, and complex alignment issues with conical designs, which result in increased replacement costs and potential shaft damage.
Innovation Solution
A roller grinder system with a shaft split into two parts, utilizing frusto-conical geometry and coupling mechanisms to securely mount and dismount a cylindrical grinding shell, allowing for easy exchange and alignment, and an extracting device to facilitate disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal expansion-contraction method is used to mount the grinding shell, then the shell can be retained with high friction around the shaft, but the shell may crack upon cooling and lose its geometric form due to thermal stress
Solution Approach 1:
The invention changes the mounting mechanism from thermal expansion-contraction to mechanical expansion via an expansion ring. The expansion ring is radially expanded by a wedge to increase its diameter, allowing it to tightly grip the grinding shell without subjecting the shell to thermal stress that causes cracking and geometric distortion.
Solution Approach 2:
The invention replaces the thermal field (heating/cooling) with a mechanical field (wedge-driven expansion ring). Instead of using heat to expand the shell for mounting and cooling to retain it, the system uses a mechanically actuated expansion ring that can be radially expanded and contracted through wedge action, eliminating thermal stress on the grinding shell.
2Reliability
If thermal expansion-contraction method is used to mount the grinding shell, then the shell can be retained with high friction around the shaft, but the dismounting becomes extremely difficult and time consuming
Solution Approach 1:
The invention replaces the thermal field (heating/cooling) with a mechanical field (wedge-driven expansion ring). Instead of using heat to expand the shell for mounting and cooling to retain it, the system uses a mechanically actuated expansion ring that can be radially expanded and contracted through wedge action, eliminating thermal stress on the grinding shell.
Solution Approach 2:
The expansion ring transforms from a static component to a dynamically adjustable one. Through the wedge mechanism, the ring can be radially expanded to grip the shell during mounting, and then contracted to release the shell during dismounting, making the retention and release processes controllable and reversible without extreme forces.
3Reliability
If a wedge and internally conical grinding shell are used, then the mounting frictional interference is achieved, but the axial and radial alignments become difficult and replacement operations are complex and costly
Solution Approach 1:
The invention divides the shaft into two separate parts: a main shaft body and an expansion ring that can be independently adjusted. This segmentation allows the expansion ring to be radially expanded to grip the grinding shell without requiring complex axial and radial alignments of the entire shaft assembly, simplifying the mounting and replacement operations.
Solution Approach 2:
The expansion ring acts as an intermediary component between the shaft and the grinding shell. Instead of directly mounting the shell to the shaft with complex conical alignments, the expansion ring mediates the connection by providing a radially expandable gripping surface that simplifies the alignment requirements and facilitates easier mounting and dismounting.
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 solution enables convenient and cost-effective mounting and dismounting of grinding shells, reducing wear and damage, while maintaining secure frictional interference to prevent shell loosening during operation, thus lowering replacement costs and simplifying the assembly process.
Implementation Method 1
The outer grinding shell is heated to present a thermal expansion sufficient to allow it to axially slide around the shaft, until reaching the mounting position, in which its cooling and shrinkage produce its retention, by high interference, around the hub portion of the shaft
Data Source
AI summary
A roller for a roller grinder, the roller including a shaft and a grinding shell in the form of a tubular sleeve and having an inner face to be retained around the shaft. The roller grinder is characterized in that the shaft includes two shaft parts, each shaft part having a respective inner end portion, wherein the inner end portions are arranged to be positioned facing each other and include coupling portions arranged to couple the inner end portions of the respective shaft parts to each other, thereby forming the shaft. The disclosure further relates to a method for assembling a roller for a roller grinder, the roller including a shaft and a grinding shell in the form of a tubular sleeve and having an inner face to be retained around the shaft.