Pressure-Based Speed Control for Double-Shaft Shredders
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Solution Overview
Problem
Existing industrial shredders face issues with material jamming and blocking, leading to operational inefficiencies and reduced service life of shaft components due to mechanical stress.
Innovation Solution
A method for controlling the rotation speed of double-shaft shredder shafts using pressure sensors and logic control units to adjust hydraulic motor flow rates based on detected resistance, preventing jamming and mechanical stress through adaptive flow rate adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotation speed of the shafts is increased to improve productivity, then the shredding efficiency is improved, but the material jamming and blocking increases
Solution Approach 1:
The patent implements dynamic speed control of the shafts based on real-time detection of material properties and shredding conditions. The rotation speed is not fixed but continuously adjusted to optimal values according to the specific material being processed, preventing jamming while maintaining high productivity.
Solution Approach 2:
The control system uses feedback from sensors detecting material resistance and shaft load to automatically adjust the rotation speed. When jamming is detected or anticipated, the system reduces speed preventively, creating a closed-loop control that resolves the contradiction between speed and reliability.
2Productivity
If the rotation speed of the shafts is increased to improve productivity, then the shredding efficiency is improved, but the mechanical stress on shafts increases reducing service life
Solution Approach 1:
The system dynamically adjusts shaft rotation speed based on detected material properties and resistance levels. By optimizing speed rather than maximizing it, the mechanical stress on shafts is reduced while maintaining high shredding efficiency, thereby extending shaft service life.
Solution Approach 2:
The control system changes operational parameters (rotation speed) based on real-time conditions. By adapting the speed parameter to match material characteristics and shaft load capacity, the system prevents excessive mechanical stress that would reduce shaft service life while preserving productivity.
3Ease of operation
If a fixed rotation speed is used to simplify operation, then the ease of operation is improved, but the adaptability to different materials decreases leading to jamming
Solution Approach 1:
The control system automatically detects material properties and self-adjusts the rotation speed without operator intervention. This self-service capability maintains ease of operation while achieving high adaptability to different materials, eliminating jamming through automatic parameter optimization.
Solution Approach 2:
The system uses feedback from material detection sensors to automatically adjust operational parameters. This closed-loop control provides adaptability to various materials while keeping the operator interface simple, as the system handles the complex adjustments automatically based on detected 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
Reduces material jamming and blocking, extends the service life of shredder components by minimizing mechanical stress, ensuring efficient operation and maintenance intervals.
Implementation Method 1
each shaft is connected with a pressure transducer which detects the pressure thereof caused by the resistance of the scrap to be shredded
Data Source
AI summary
A method for controlling the rotation speed of a first and a second shaft of an industrial shredder as described, for material to be sorted and/or disposed of, for example metal and non-metal scrap, that is intended to be shredded between blades of the shafts. The shredder is provided with pressure sensors, which detects the pressure on each shaft, and a control unit, which acts on the pumps that supply pairs of hydraulic motors connected to the shafts. When the pressure sensor detects that the pressure value of at least one shaft is greater than a pre-set threshold pressure value, the control unit reduces the initial flow rate value of at least one of the two pumps so as to reduce the rotation speed of the respective shaft and facilitate the shredding of the scrap material.