Gyratory Crusher Outer Shell Shoulder Region Design
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Solution Overview
Problem
Conventional gyratory crusher designs fail to optimize throughput capacity while increasing reduction efficiency, necessitating an improved outer crushing shell that controls material flow and crushing force area to enhance performance.
Innovation Solution
The outer crushing shell is designed with a shelf or shoulder region that restricts material flow, reducing the axial length and crushing surface area, thereby increasing pressure in the crushing chamber to enhance reduction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the outer crushing shell has a longer axial length and larger crushing surface area, then the throughput capacity is increased, but the reduction effect deteriorates due to insufficient pressure in the crushing chamber
Solution Approach 1:
The outer crushing shell is segmented into three distinct regions: an inlet region with a first contact surface, a shoulder region with a second contact surface that projects radially inward, and a crushing region with a third contact surface. This segmentation allows each region to perform a specific function - the inlet region receives material, the shoulder region restricts flow and builds pressure, and the crushing region performs reduction, thereby resolving the contradiction between throughput and reduction effect
Solution Approach 2:
Different regions of the outer crushing shell are given different geometric properties and contact surface orientations tailored to their specific functions. The inlet region has a contact surface inclined at a first angle, the shoulder region has a contact surface projecting radially inward at a second angle, and the crushing region has a contact surface inclined at a third angle. This local differentiation optimizes both material flow and pressure generation simultaneously
2Manufacturing precision
If the outer crushing shell is designed to maximize crushing efficiency, then the reduction effect is improved, but the throughput capacity deteriorates due to excessive pressure and restricted material flow
Solution Approach 1:
The design creates a dynamic balance between material flow and pressure generation through the shoulder region's radial projection. The shoulder region temporarily restricts flow to build pressure for effective crushing, then allows controlled flow through the crushing region. This dynamic flow management maintains both high reduction effect and acceptable throughput capacity
3Stress or pressure
If the shoulder region projects radially inward with a steep inclination angle, then the pressure in the crushing chamber is increased to improve reduction, but the axial length and crushing surface area are reduced which may limit throughput
Solution Approach 1:
The shoulder region's contact surface projects radially inward (in the radial dimension) rather than extending axially downward, creating a shelf-like structure. This radial projection increases pressure through flow restriction without significantly increasing axial length, as the pressure-generating feature extends in the radial direction rather than the axial direction
Data Source
AI summary
A gyratory crusher includes an inner and an outer crushing shell. The outer crushing shell has three regions along its axial length including: an inlet region that tapers radially inward from an uppermost first end; a crushing region that extends radially inward from a second lowermost end; and a radially innermost shoulder region that is positioned axially between the inlet and crushing regions. An angle of inclination of a radially inward facing surface at the inlet and shoulder regions and the axial length of the crushing surface are designed to optimize crushing capacity in addition maximizing reduction.