Impact Crusher Apron Pre-Load and Reset Mechanism
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Solution Overview
Problem
Conventional impact crushers face issues with uncrushable oversize material generating forces that exceed spring-load limits, causing the apron to move away from the rotor, and lack efficient mechanisms for re-setting the working position and preventing apron-rotor collision.
Innovation Solution
An impact crusher design featuring a pre-loaded apron with a mechanical stop, allowing it to pivot away from the rotor when excessive forces are detected and automatically return to its normal position, using a pressure cylinder or linear motor for pre-loading and a suspension member with adjustable mechanical stop for controlled positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring-loaded apron is used to provide reaction force against crushing forces, then the apron can maintain its working position during normal operation, but uncrushable oversize material may generate forces exceeding the spring-load, causing the apron to move away from the rotor
Solution Approach 1:
The apron is made dynamically responsive to force conditions through the spring-loaded mechanism, allowing it to automatically move away from the rotor when excessive forces are applied (such as from uncrushable material) and return to its working position when the force is removed. This dynamic behavior protects the system from damage while maintaining operational reliability.
Solution Approach 2:
The spring-loaded mechanism provides beforehand cushioning by absorbing and accommodating excessive forces before they can cause damage to the apron-rotor assembly. The spring absorbs the energy from uncrushable material impacts, preventing direct transmission of harmful forces to the rotor and other chamber components.
2Ease of operation
If an hydraulic cylinder arrangement is used to set and reset the apron working position, then the position can be adjusted and restored after uncrushable material passage, but the system becomes more complex and requires additional components
Solution Approach 1:
The spring-loaded mechanism provides self-service functionality, automatically resetting the apron to its working position after it has moved away due to excessive forces. The system uses the removal of the causing condition (uncrushable material) as the trigger for automatic return, eliminating the need for external hydraulic reset mechanisms and proximity sensors.
Solution Approach 2:
The invention extracts and eliminates the hydraulic cylinder and proximity sensor components from the system, replacing them with a simpler spring-loaded mechanical mechanism that achieves the same functional outcomes of position setting and automatic resetting through pure mechanical means.
3Stability of the object's composition
If the apron is held at a fixed distance from the rotor against a mechanical stop, then the working position is stable during normal operation, but the apron cannot automatically respond to excessive forces from uncrushable material
Solution Approach 1:
The system combines a mechanical stop for normal position stability with a spring-loaded mechanism that provides dynamic response to force variations. During normal operation, the apron rests against the mechanical stop at a fixed, stable position. When excessive forces occur, the spring-loaded mechanism enables the apron to move away from the rotor, and automatically return when the force is removed.
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 design enhances the reliability and safety of the crusher by reducing wear, enabling simple re-setting of the apron position and preventing apron-rotor collision, while allowing for controlled adjustment of the distance between the rotor and apron.
Implementation Method 1
the apron may be spring-loaded to provide a reaction against said forces
Implementation Method 2
the apron is coupled to a first arrangement for applying pre-load to the apron
Implementation Method 3
a second arrangement for providing a mechanical stop against which the apron is suspended in normal use
Implementation Method 4
the rotor being configured for striking feed material present in the crushing chamber
Data Source
AI summary
An impact crusher includes a crushing chamber, a rotor mounted in the crushing chamber, and an apron having an impact surface, said apron being movably positioned within the chamber. The apron is pre-loaded to oppose forces generated within the crushing chamber. The apron is free to move away from the rotor in the event that the forces generated within the chamber exceed a predetermined threshold. During normal use, the apron is suspended within the chamber against a mechanical stop, and the apron is free to return to its initial suspended position after the removal of uncrushable material from the chamber.