Jaw Crusher Variable Eccentric Drive for Start-Up Under Load
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Solution Overview
Problem
Conventional operating mechanisms for material processing devices, such as jaw crushers, suffer from inflexibility, inefficiency, and high power consumption due to fixed stroke movement, which limits crushing capabilities and increases energy consumption, especially during start-up and run-down, and are unsuitable for starting under load conditions.
Innovation Solution
A shaft-based operating mechanism with a coupling portion that adjusts its eccentricity relative to the shaft axis, allowing for variable oscillatory movement of the movable part, enabling configurations with zero eccentricity for reduced power consumption and efficient start-up, and adjustable eccentricity for optimal crushing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional operating mechanisms with fixed stroke are used, then the structure is simple, but the adaptability and crushing flexibility are limited
Solution Approach 1:
The patent applies the dynamics principle by making the eccentricity of the coupling portion adjustable rather than fixed. The coupling portion can be repositioned along the shaft to change the eccentricity value, allowing the mechanism to dynamically adapt between different operating modes (zero eccentricity for start-up, non-zero for crushing). This transforms a static mechanism into a dynamic one that can adjust its characteristics based on operational requirements.
Solution Approach 2:
The patent implements parameter changes by varying the eccentricity parameter of the coupling portion. By adjusting the position of the coupling portion relative to the shaft axis, the eccentricity parameter can be changed from zero to non-zero values. This parameter adjustment enables the same mechanism to perform different functions - starting without load and crushing with load - thereby improving adaptability without requiring multiple separate mechanisms.
2Use of energy by moving object
If fixed eccentricity coupling is used, then the structure is simple, but the power consumption during start-up and run-down is high
Solution Approach 1:
The patent applies dynamics by enabling the coupling portion to change its eccentricity state from fixed to variable. During start-up and run-down phases, the coupling portion can be positioned at zero eccentricity, creating a balanced rotating system that minimizes power consumption. During crushing operations, the eccentricity is adjusted to non-zero values to generate the necessary oscillatory motion. This dynamic adjustment of eccentricity optimizes energy usage across different operational phases.
Solution Approach 2:
The patent implements periodic action by alternating between zero eccentricity mode (during start-up and run-down) and non-zero eccentricity mode (during crushing). This periodic switching between different operational states allows the system to consume minimal power during transitional phases while maintaining full crushing capability during productive phases, thereby reducing overall energy consumption.
3Adaptability or versatility
If conventional fixed stroke mechanism is used, then the mechanism is robust, but it cannot start under load conditions
Solution Approach 1:
The patent applies dynamics by making the eccentricity of the coupling portion variable rather than fixed. This allows the mechanism to adapt its characteristics based on loading conditions. During start-up, the coupling portion can be positioned at zero eccentricity to minimize starting torque requirements. Once the system is running and loaded, the eccentricity can be adjusted to non-zero values to enable effective crushing under load, thus achieving start-up capability that conventional fixed mechanisms cannot provide.
Solution Approach 2:
The patent implements parameter changes by adjusting the eccentricity parameter in response to loading conditions. The system can detect load status and相应地 adjust the coupling portion position - using zero eccentricity for light-load start-up conditions and non-zero eccentricity for heavy-load crushing conditions. This parameter adaptation enables the mechanism to start under various load conditions while maintaining robust operation.
4Reliability
If powerful components are used to handle loads, then the reliability is improved, but the power consumption and cost increase
Solution Approach 1:
The patent applies dynamics by enabling the mechanism to adjust its load-handling characteristics through variable eccentricity. During start-up and run-down phases, the zero eccentricity configuration minimizes power consumption while maintaining sufficient control. During crushing operations, the non-zero eccentricity provides the necessary mechanical advantage to handle heavy loads reliably. This dynamic adjustment allows the system to use powerful components only when needed, rather than continuously, thereby reducing overall power consumption while maintaining reliability.
Solution Approach 2:
The patent implements parameter changes by varying the eccentricity parameter to match load requirements. When heavy loads need to be handled, the eccentricity is adjusted to non-zero values, providing the mechanical advantage needed for reliable load handling. When loads are minimal (during start-up/run-down), the eccentricity is reduced to zero, minimizing power consumption. This parameter adaptation allows the system to maintain reliability for load handling while reducing energy consumption during low-demand phases.
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 mechanism reduces power requirements, improves efficiency, and allows for flexible crushing actions, enabling start-up under load conditions and reducing energy demand, thus enhancing operational flexibility and reducing downtime.
Implementation Method 1
the coupling portion rotates eccentrically about said shaft axis, or rotates eccentrically with respect to the shaft axis
Data Source
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AI summary
A jaw crusher has an operating mechanism comprising a rotatable shaft coupled to a movable jaw in order to translate rotation of the shaft into oscillatory movement of the jaw. The shaft comprises a coupling portion by which the shaft is coupled to the movable part, wherein, in at least one configuration, a central axis of the coupling portion is parallel with the shaft axis and the coupling portion is eccentric with respect to the shaft axis. The coupling portion is configurable to adjust the location of the central axis with respect to the shaft axis in order to adjust the eccentricity of the coupling portion with respect to the shaft axis, thereby correspondingly adjusting the oscillatory movement imparted to the movable jaw.