Davit Crane Actuation Assembly Stress Reduction
Solution Overview
Problem
Conventional davit cranes face issues with high tension stress in pulley systems leading to cable fraying and require additional pneumatic or hydraulic components for operation, which can be cumbersome.
Innovation Solution
A davit crane design featuring a linearly moving actuation assembly for raising and lowering a boom arm and a slew bearing for rotational movement, utilizing a gear system with a jack screw and worm gear to reduce stress and eliminate the need for additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pulley systems are used for raising and lowering equipment, then lifting functionality is provided, but high tension stress causes cable fraying at an increased rate
Solution Approach 1:
The patent replaces the traditional pulley system with a direct actuation mechanism where an actuator (electric motor, hydraulic cylinder, or pneumatic cylinder) directly moves the boom assembly between raised and lowered positions. This eliminates cables and pulleys from the lifting mechanism, thereby eliminating tension stress on cables and preventing cable fraying.
2Ease of operation
If pneumatic or hydraulic systems are used for raising and lowering equipment, then lifting functionality is provided, but additional components (air compressor, hydraulic components) are required
Solution Approach 1:
The patent extracts and eliminates the unnecessary pneumatic or hydraulic components (air compressors, hydraulic pumps, reservoirs, etc.) from the system. Instead, it uses a simplified actuator that can be directly integrated into the boom assembly, reducing component count while maintaining operational smoothness through direct actuation.
Solution Approach 2:
The actuator serves multiple functions: it provides the lifting force to raise the boom, controls the lowering through controlled descent, and can be integrated with the rotation mechanism. This multi-functionality reduces the need for separate pneumatic or hydraulic systems while maintaining ease of operation.
3Adaptability or versatility
If conventional davit cranes are used, then lifting capability is provided, but the system requires cumbersome additional components for operation
Solution Approach 1:
The patent merges the actuation mechanism directly into the boom assembly, creating an integrated unit where the actuator, boom, and support structures work as a unified system. This integration eliminates the need for separate pneumatic or hydraulic systems while maintaining full lifting capability and adaptability for various loads.
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 davit crane effectively manages stress on lifting components and eliminates the need for pneumatic or hydraulic systems, enhancing operational efficiency and reducing maintenance costs.
Implementation Method 1
a gear system with a jack screw and worm gear to reduce stress
Implementation Method 2
jack screw operably engaged with the actuating column and operably engaged with the drive assembly
Implementation Method 3
a slew bearing that rotatably moves the boom arm
Data Source
AI summary
A davit crane that includes a base adapted to operably engage with a ground surface. The davit crane also includes a drive assembly operably engaged with the base. The davit crane also includes an actuation assembly operably engaged with the drive assembly, wherein the actuation assembly is configured to move between a lowered position and a raised position via the drive assembly. The davit crane also includes a boom assembly operably engaged with the actuation assembly. The actuation assembly of the davit crane is operable to pivotably adjust the boom assembly between the raised position and the lowered position.