Screw Flight Wear Lining Alignment for Faster Mill Replacement
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Solution Overview
Problem
The exchange of wear liner elements in vertical grinding mills is difficult due to their large size and weight, and limited access, making it inefficient to position and fasten them to the screw flight system.
Innovation Solution
A screw flight system with a guiding system featuring guide pins and holes, allowing for easier alignment and fastening of wear lining elements, and a replacement kit with guide pins for efficient mounting and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wear lining elements are made large and heavy to provide sufficient grinding capability, then grinding performance is improved, but positioning and fastening becomes difficult due to limited access
Solution Approach 1:
A guiding system comprising guide pins and guide holes is introduced as an intermediary mechanism between the wear lining element and the screw flight. The guide pins fit into guide holes to provide alignment and positioning assistance during installation, making it easier to handle large and heavy wear lining elements in limited access environments
Solution Approach 2:
The guide pins are pre-installed on the screw flight before the wear lining element is positioned. This preliminary action of having the guiding system in place beforehand facilitates the subsequent positioning and fastening of the heavy wear lining element without requiring complex manual alignment procedures
2Productivity
If wear lining elements are large and heavy, then grinding performance is improved, but exchange time increases due to difficulty in positioning and fastening
Solution Approach 1:
The guiding system with guide pins and guide holes acts as a mediator that speeds up the exchange process by providing automatic alignment. This eliminates time-consuming manual positioning operations when installing or replacing large wear lining elements
Solution Approach 2:
By pre-installing the guide pins on the screw flight, the system is prepared in advance to quickly receive and position the wear lining element. This preliminary preparation significantly reduces the time required for element exchange while maintaining the necessary grinding performance
3Device complexity
If guide pins are arranged on the same line as bolt holes, then structure is simplified, but fastening requires removal of guide pins which increases time
Solution Approach 1:
The guide pins are deliberately positioned asymmetrically relative to the bolt hole pattern, specifically arranged in a radial direction offset from the first line connecting the bolt holes. This asymmetric arrangement allows the guide pins to remain in place during fastening operations, eliminating the need to remove them and thus reducing fastening time while maintaining structural simplicity
Data Source
AI summary
A screw flight system including a helical screw flight, and at least one wear lining element is disclosed. The screw flight system further includes a guiding system including at least one guide pin configured to be arranged on one of the helical screw flight and the at least one wear lining element, and at least one guide hole arranged on the other of the helical screw flight and the at least one wear lining element, wherein the at least one guide hole being configured to receive the at least one guide pin. A vertical grinding mill including the screw flight system, a replacement kit of wear lining elements, and a method for mounting thereof are also disclosed.