Crusher Gap Control via Dynamic Hydraulic Pressure Relief
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing mineral material crushers face inefficiencies and potential damage due to uncrushable materials, leading to overload situations and reduced productivity, as they lack effective methods for managing crushing chamber loads and adjusting crusher settings in real-time.
Innovation Solution
A method and system utilizing hydraulic cylinders with adjustable pressure relief valves to maintain a crusher gap, where the opening pressure limit is set higher than normal hydraulic pressure, allowing for automatic adjustment based on measured pressure to prevent overload and optimize energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the opening pressure limit is set low to protect against uncrushable material, then the crusher is protected from damage, but the crushing process is interrupted frequently reducing productivity
Solution Approach 1:
The opening pressure limit is made dynamically adjustable rather than fixed. The system automatically adapts the pressure threshold based on real-time monitoring of crushing conditions, material properties, and crusher load. This allows the system to tolerate higher pressures for crushable material (maintaining productivity) while still protecting against uncrushable material through automatic limit adjustment.
Solution Approach 2:
The hydraulic pressure parameters are made variable instead of constant. The system changes the opening pressure limit parameter based on detected crushing conditions, allowing optimal protection thresholds to be established dynamically. This resolves the contradiction by enabling the system to operate at high productivity when conditions permit while maintaining reliability when uncrushable material is detected.
2Use of energy by moving object
If the crusher gap is maintained tightly to maximize crushing capacity, then energy efficiency is improved, but the risk of overload from uncrushable material increases
Solution Approach 1:
A feedback control system continuously monitors hydraulic pressure in the gap maintenance cylinders and compares it against the dynamically adjusted opening pressure limit. When pressure approaches the limit (indicating potential uncrushable material), the system automatically adjusts the crusher gap to prevent overload. This feedback mechanism allows the system to maintain tight gaps for energy efficiency while providing automatic protection against overload conditions.
Solution Approach 2:
The system performs preliminary detection of potentially uncrushable material by monitoring pressure trends before actual overload occurs. By detecting pressure increases early and adjusting the gap proactively, the system prevents overload situations while maintaining optimal crushing conditions for energy efficiency during normal operation.
3Reliability
If manual adjustment of crusher settings is used to handle uncrushable material, then the crusher can be protected, but the complexity of operation increases and productivity decreases
Solution Approach 1:
The crusher system performs self-protection through automatic monitoring and adjustment. The control system continuously detects uncrushable material through pressure monitoring and automatically adjusts crusher settings without requiring manual intervention. This self-service capability eliminates the need for operators to manually assess and adjust settings, maintaining both protection and operational simplicity.
Solution Approach 2:
Manual mechanical adjustment of crusher settings is replaced with an automated control system that uses electronic sensors and actuators. The system substitutes human judgment and manual operation with automated pressure monitoring and control, reducing operational complexity while maintaining reliable protection against uncrushable material.
4Power
If the hydraulic pressure is kept high to maintain crusher gap, then crushing force is maximized, but the risk of damage from uncrushable material increases
Solution Approach 1:
The hydraulic pressure system operates dynamically with variable pressure thresholds. During normal crushing of suitable material, high pressure is maintained to maximize crushing force and power. When uncrushable material is detected through pressure monitoring, the system automatically reduces pressure to protect components. This dynamic pressure control resolves the contradiction by enabling high power operation when safe and protection when necessary.
Solution Approach 2:
The system establishes a pressure safety threshold beforehand that acts as a protective cushion against component damage. By monitoring pressure against this pre-established limit and automatically reducing pressure when approaching the threshold, the system cushions against potential damage from uncrushable material while allowing high pressure operation for maximum crushing force during normal 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
This approach enhances energy efficiency, reduces peak loads, prolongs the lifespan of crusher components, and improves productivity by allowing for real-time adjustment of the crusher gap to handle uncrushable materials without interrupting the crushing process.
Implementation Method 1
the crusher gap is maintained using at least one hydraulic cylinder
Implementation Method 2
In case the hydraulic liquid pressure exceeds a pressure threshold, hydraulic liquid is evacuated from the cylinder to increase the crusher gap size
Data Source
AI summary
A method for operating a mineral material crusher, a system including a crusher, and a crushing plant. The mineral material crusher, includes a first crushing element and a second crushing element, defining a crusher gap therebetween. The crusher gap is maintained using at least one hydraulic cylinder, the hydraulic liquid pressure in at least one of the hydraulic cylinders is measured and hydraulic liquid is evacuated from the hydraulic cylinder when the hydraulic liquid pressure exceeds a set opening pressure limit. During the crushing process the following steps are repeated: generating, based on the hydraulic liquid pressure measurement, a representative value of a normal hydraulic liquid pressure in the at least one hydraulic cylinder caused by the crushable material in that crushing application; comparing the generated representative value and the set opening pressure limit; and selecting opening pressure limit which is higher than the measured normal hydraulic liquid pressure.