Electric Lifting Device with Eccentric Drive for Vessel Stability
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Solution Overview
Problem
Lifting devices for vessels face issues such as hydraulic fluid leakage and safety concerns, particularly in ensuring stable operation and preventing load swinging during launching or recovering processes.
Innovation Solution
A lifting device with a rigid tiltable element driven by electric motors, which rotate a rotatable element between extreme positions to control the lifting element's angle within a defined interval, using multiple motors to apply torque in opposite directions when necessary to maintain stability and prevent excessive movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If hydraulic drives are used in lifting devices, then the lifting function is achieved, but hydraulic fluid leakage occurs
Solution Approach 1:
The patent replaces the hydraulic drive system with an electric motor system. The electric motor directly drives the lifting element through a drive rod and rotatable element mechanism, eliminating the hydraulic fluid leakage problem while maintaining the lifting function.
2Ease of operation
If the lifting element is allowed to move freely, then the lifting operation is simple, but the load swings excessively
Solution Approach 1:
The patent implements a control system that monitors the position of the lifting element and adjusts the motor torque accordingly. When the lifting element approaches extreme positions, the control system reduces torque to prevent excessive movement and load swinging, while maintaining ease of operation within the controlled range.
Solution Approach 2:
The patent changes the operational parameters by limiting the rotation range of the lifting element to a controlled interval between extreme positions. The motor torque is dynamically adjusted based on the position within this interval, preventing excessive movement while maintaining operational simplicity.
3Stability of the object's composition
If the lifting element is constrained within a limited angle range, then load swinging is minimized, but the lifting versatility is reduced
Solution Approach 1:
The patent makes the lifting element dynamically adjustable within a controlled range. The motor can rotate the lifting element between extreme positions as needed, and the control system automatically adjusts torque to maintain stability. This dynamic control allows the system to adapt to different lifting scenarios within the controlled angle range, maintaining both stability and versatility.
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 solution effectively prevents hydraulic fluid leakage, enhances safety by ensuring the lifting element operates within a controlled angle range, and minimizes load swinging by dynamically adjusting motor torque to maintain stability during vessel operations.
Implementation Method 1
one or more electrical motors configured to rotate the rotatable element around a second axis
Implementation Method 2
the drive rod being connected to the rotatable element so as to rotate around a third axis not identical to the second axis
Data Source
AI summary
A lifting element, such as for a vessel or vehicle, comprising a lifting element, such as an oblong element, rotated by a number of electrical motors via a rotatable, such as an eccentric, element. The eccentric element ensures that the lifting element can only be tilted within a predetermined angle area increasing the safety thereof. Multiple electric motors are used where one motor counteracts the other within an angle interval to ensure that the tilting element does not tilt undesirably.