Crusher Housing Dynamics for Foreign Object Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Crushers with shear pins require frequent shutdowns and maintenance when foreign objects cause excessive impactive force, leading to damage and the need for component replacement.
Innovation Solution
A crusher design featuring a pivotably mounted housing with a lever and biasing means that allows the fixed blade to retreat from the crushing chamber when excessive force is applied, eliminating the need for immediate component replacement and enabling quick return to operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shear pin is used to hold the housing, then the housing can be securely held during normal operation, but the crusher must shutdown and require maintenance when foreign objects cause excessive impactive force
Solution Approach 1:
The housing is changed from a static fixed position to a dynamic movable position that can retreat when excessive force is applied. The lever mechanism allows the housing to move between a normal operating position and a protected position, enabling the system to adapt to varying load conditions without shutdown.
Solution Approach 2:
The holding force parameter is made variable through the lever mechanism. The biasing means adjusts the force applied to the housing, allowing it to maintain secure holding during normal operation but release when excessive force is detected, thus maintaining both reliability and productivity.
2Reliability
If a shear pin is used to hold the housing, then the housing can be securely held during normal operation, but broken shear pins require replacement and cause downtime
Solution Approach 1:
The lever mechanism with biasing means is designed to automatically respond to excessive force by allowing the housing to retreat and protect itself. This self-protecting mechanism eliminates the need for external intervention or replacement of consumable components like shear pins, simplifying maintenance.
Solution Approach 2:
The dynamic lever mechanism provides a reusable, self-adjusting protection system that doesn't require replacement. Unlike shear pins that break and need replacement, the lever system can repeatedly engage and disengage based on load conditions, reducing maintenance complexity.
3Productivity
If the fixed blade is held firmly in position, then crushing efficiency is maximized, but the bearings and structure are vulnerable to damage from excessive impactive force
Solution Approach 1:
The fixed blade's position is made dynamic through the lever mechanism. The blade is held firmly during normal operation for maximum crushing efficiency, but can automatically retreat when excessive force is applied to protect the bearings and structure, thus balancing productivity and strength.
Solution Approach 2:
The position parameter of the fixed blade is made variable. The blade transitions between a fixed position for efficient crushing and a retreated position for protection, allowing the system to optimize both crushing efficiency and structural strength based on operational conditions.
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
The solution prevents damage to the crusher's bearings and structure by allowing the fixed blade to retreat from excessive force, allowing the crusher to quickly resume operation without replacing broken shear pins.
Implementation Method 1
biasing means for biasing the lever at a set biasing force
Implementation Method 2
a roller is turnably provided at the holding portion of the lever to be abutted against the housing
Data Source
AI summary
A crusher is provided that can quickly return to the operating state from a shutdown state which occurs due to the incorporation of a foreign object. Provided are a crushing rotor 32, a housing 41 and an anvil 33 supported by the housing to face a crushing chamber 31. A lever 90 is disposed on the side opposite the crushing rotor 32 with respect to the housing 41, pivotably installed with respect to side frames 19, and provided with a holding portion for holding the housing 41 to keep a posture where the anvil 33 faces the crushing chamber 31. An elastic member 93 is for biasing the lever 90 at a set biasing force. When the biasing force is exceeded, the lever 90 turns to permit the anvil 33 to turn and retreat from the crushing chamber 31.