Article Lifting/Lowering Control with Belt-Diameter Compensation
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Solution Overview
Problem
Existing article lifting/lowering apparatuses experience significant vibrations due to abrupt changes in velocity during transitions between accelerated and constant velocity operations, particularly when using belts as suspension materials, leading to increased mechanical stress on the holding unit and the article.
Innovation Solution
The apparatus controls the rotational velocity of the pulleys to match the changing diameter of the wound belt, gradually increasing or decreasing the velocity to maintain a consistent lowering or lifting speed, thereby minimizing abrupt changes in acceleration and reducing vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rotational velocity of the pulley is kept constant during constant velocity lowering operation, then the control system is simple, but the lowering velocity of the holding unit decreases as the winding-up diameter decreases, causing large acceleration changes and increased vibration
Solution Approach 1:
The patent applies dynamics by making the rotational velocity of the pulley variable rather than constant. During the constant velocity lowering operation, the control unit gradually increases the rotational velocity of the pulley in response to the gradual decrease in the winding-up diameter of the belt. This dynamic adjustment compensates for the diameter change, maintaining a stable lowering velocity of the holding unit and suppressing vibration.
Solution Approach 2:
The patent changes the rotational velocity parameter of the pulley dynamically during operation. Instead of maintaining a fixed rotational velocity, the control unit adjusts the rotational velocity parameter to increase gradually as the winding-up diameter decreases, thereby maintaining constant lowering velocity of the holding unit and reducing acceleration changes that cause vibration.
2Productivity
If the lowering velocity is increased rapidly to reach target velocity quickly, then productivity is improved, but large acceleration changes occur during velocity transitions, increasing vibration and mechanical stress
Solution Approach 1:
The patent implements a multi-phase periodic action pattern for lowering operation: accelerated lowering operation to gradually increase velocity, constant velocity lowering operation to maintain target velocity, and decelerated lowering operation to gradually decrease velocity. This periodic phase structure allows efficient productivity while controlling acceleration changes through proper transition management between phases.
Solution Approach 2:
During the constant velocity lowering operation phase, the pulley's rotational velocity is dynamically increased to compensate for the decreasing winding-up diameter. This dynamic adjustment ensures smooth velocity maintenance during the constant velocity phase, preventing abrupt acceleration changes at phase transitions and reducing vibration while maintaining productivity.
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 control method effectively suppresses vibrations by ensuring smooth transitions between operational phases, maintaining stable motion and reducing mechanical stress on the holding unit and article.
Implementation Method 1
a pulley 21, a belt 22 wound around the pulley 21
Data Source
AI summary
When a holding unit is lowered, a control unit gradually increases the lowering velocity of the holding unit toward a target lowering velocity, performs a constant velocity lowering operation of maintaining the lowering velocity of the holding unit at the target lowering velocity, and then gradually decreases the lowering velocity of the holding unit from the target lowering velocity to stop the holding unit. The control unit controls the drive unit to gradually increase the rotational velocity of the pulleys in response to a gradual decrease in the diameter of the outer surface of the belt wound-up around the pulley by unwinding in the constant velocity lowering operation.