Gyratory Crusher Shell Shoulder Region Design
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Solution Overview
Problem
Conventional gyratory crusher designs fail to optimize crushing capacity while increasing reduction efficiency, particularly in heavy-duty primary crushers for mining applications.
Innovation Solution
The design of an outer crushing shell with a radially inward projecting shoulder region that restricts material flow, reducing throughput capacity and increasing pressure in the crushing chamber to enhance reduction efficiency, by varying parameters such as the angle of inclination of the contact surfaces and wall thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the outer crushing shell has an inner facing contact surface that tapers inwardly towards the mantle, then the through-flow of material is accelerated and crushing capacity increases, but crushing reduction effect is insufficient
Solution Approach 1:
The crushing shell is divided into three distinct regions: inlet region with first contact surface, shoulder region with second contact surface, and crushing region with third contact surface. Each region has optimized geometry to perform specific functions - the inlet region accelerates material flow, the shoulder region restricts flow to build pressure, and the crushing region provides reduction, thereby resolving the contradiction between capacity and reduction effect
Solution Approach 2:
Different sections of the crushing shell are given different geometric properties - the inlet region has a specific inclination angle to accelerate flow, the shoulder region has a different inclination to restrict flow, and the crushing region has optimized geometry for reduction. This local differentiation allows simultaneous optimization of capacity and reduction effect
2Productivity
If the throughput capacity is increased to maximize production, then productivity improves, but reduction efficiency decreases
Solution Approach 1:
The shoulder region acts as a dynamic flow restrictor that creates variable pressure zones within the crushing chamber. By strategically positioning the shoulder region with specific inclination angles, the design dynamically controls material flow to create high-pressure zones that enhance reduction efficiency while maintaining overall throughput capacity
Data Source
Figure 1
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AI summary
A gyratory crusher outer crushing shell (106). The outer shell comprises three regions along its axial length including: an inlet region (121) that tapers radially inward from an uppermost first end (124); a crushing region (123) that extends radially inward from a second lowermost end (125) and; a radially innermost shoulder region (122) that is positioned axially between the inlet and crushing regions. An angle of inclination (a,b) of a radially inward facing surface at the inlet and shoulder regions and the axial length (C) of the crushing surface are designed to optimise crushing capacity in addition to maximising reduction.