Eccentric Assembly Speed-Dependent Locking for Vibration Compacting
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Solution Overview
Problem
Eccentric assemblies in vibration compacting machines require high start-up torque due to their eccentricity, making them inefficient during the start-up period and necessitating more powerful motors, while existing solutions do not effectively manage eccentricity during this phase.
Innovation Solution
An eccentric assembly with a housing, an eccentric shaft, a locking device, a clamping device, and a stopper that adjusts the eccentric moment based on rotational speed, allowing zero or minimal eccentricity during start-up and maximizing it when the machine reaches sufficient speed, using critical speed thresholds to control the locking and clamping of the eccentric shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the eccentric assembly maintains high eccentricity during start-up, then sufficient eccentric moment is available for working, but high start-up torque is required which necessitates a more powerful motor
Solution Approach 1:
The patent applies the dynamics principle by making the eccentric moment variable rather than constant. The eccentric shaft can change its angular position relative to the housing based on rotational speed, allowing the eccentric moment to be dynamically adjusted. During start-up, the locking device engages to fix the eccentric shaft at an initial angular position with zero or minimal eccentricity, reducing start-up torque requirements. Once the housing reaches sufficient rotational speed, the locking device releases and the clamping device allows the eccentric shaft to rotate to a working angular position, maximizing the eccentric moment for effective vibration compacting.
2Productivity
If the eccentric assembly has high eccentricity during start-up, then vibration amplitude is sufficient for compacting, but the vibrations are not used productively and compacting efficiency is reduced
Solution Approach 1:
The patent applies periodic action by implementing distinct operational phases through the locking and clamping devices. During the start-up period, the locking device engages to create a first state with zero or minimal eccentricity, preventing unproductive vibrations. After the housing reaches a predetermined rotational speed, the locking device releases and the clamping device engages to allow the eccentric shaft to rotate to a working angular position, creating a second state with sufficient eccentricity for productive vibration compacting. This periodic switching between states ensures that vibrations are only generated when they can be used effectively.
3Device complexity
If the eccentric shaft is locked at a fixed angular position, then the structure is simple, but the eccentric moment cannot be adjusted based on rotational speed
Solution Approach 1:
The patent introduces intermediary devices (locking device and clamping device) that mediate between the fixed housing and the rotatable eccentric shaft. These intermediary components enable the eccentric shaft to assume different angular positions relative to the housing based on operational requirements. The locking device acts as an intermediary that can engage to fix the eccentric shaft at an initial angular position or disengage to allow rotation to a working angular position. The clamping device serves as another intermediary that can clamp the eccentric shaft to maintain angular position or release to allow adjustment. This intermediary mechanism provides adaptability for controlling the eccentric moment while maintaining relatively simple structural implementation.
Data Source
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AI summary
Provided is an eccentric assembly (100) controlled by a rotational speed thereof. The eccentric assembly (100) includes: a housing (110) driven and rotated by a motor; an eccentric shaft (120) installed in the housing to have a changeable angular position by rotating relative to the housing; a locking device (130) adopted to lock the eccentric shaft by engaging with one side of the eccentric shaft and to unlock the eccentric shaft when a rotational speed of the housing is greater than a locking critical speed; a clamping device (140) adopted to clamp an opposite side of the one side of the eccentric shaft that engages with the locking device and to release clamping to the eccentric when a rotational speed of the housing is greater than a clamping critical speed; and a stopper (112) installed in the housing so as to limit a rotation angle of the eccentric shaft generated when locking and clamping to the eccentric shaft are released.