Mobile Device Working Arm Control for Lifting Capacity
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Solution Overview
Problem
Current mobile devices, such as forklifts and excavators, face limitations in combining vertical and horizontal lifting capabilities with efficient energy recovery and tool guidance during movement, often resulting in reduced lifting capacity and inefficient energy use.
Innovation Solution
A mobile device with a frame and working arm featuring multiple articulations and a control system that allows the tool to maintain a lifting position during upward and downward movements, utilizing a combination of pivot points and quick-change systems for angular rotations, and energy recovery mechanisms to optimize energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the mobile device uses radial lifting movement with multiple arm segments to bridge large horizontal distances, then the stretching capability is improved, but the lifting capacity is reduced
Solution Approach 1:
The mobile device dynamically adjusts the configuration of its working arm segments, transitioning between radial and vertical lifting modes based on operational requirements. The control system modifies the angles and positions of arm segments in real-time, allowing the mechanism to optimize between horizontal reach and vertical lifting capacity during operation.
2Force
If the mobile device keeps the load close to the platform during vertical lift to maximize lifting capacity, then the lifting capacity is improved, but the horizontal reach is reduced
Solution Approach 1:
The mobile device operates in three-dimensional space by combining vertical and horizontal movements of multiple arm segments. The system can extend the working arm horizontally while simultaneously adjusting vertical positions, allowing the load to be positioned at various points in 3D space rather than being constrained to a single plane.
3Adaptability or versatility
If the mobile device uses multiple arm segments with radial movements to achieve complex positioning, then the positioning flexibility is improved, but the energy consumption increases
Solution Approach 1:
The mobile device recovers energy during downward movements of the working arm and load, capturing potential energy that would otherwise be lost. The system stores this recovered energy and utilizes it during subsequent upward movements, reducing the overall energy consumption required for positioning operations.
4Force
If the mobile device uses vertical lifting movement to maintain load close to platform, then the lifting capacity is improved, but the horizontal stretching capability is reduced
Solution Approach 1:
The working arm is divided into multiple independently controllable segments that can move relative to each other. This segmentation allows different parts of the arm to perform different functions simultaneously - some segments provide vertical lifting while others extend horizontal reach, enabling the system to achieve both lifting capacity and horizontal stretching capability.
Data Source
AI summary
A mobile device includes a frame with displacement means, a working arm connected to the frame including at least a first and a second articulation which are hinged to each other. The working arm is hinged to the frame, and at least a first, second and third control devices are adapted for moving the first and second articulation of the working arm and a tool, respectively, at a free end of the second articulation. A control system is adapted for controlling the first, second and third control means. The control system is adapted to drive the first, second and third control means such that the free end of the second articulation follows a predetermined upward movement along an upwardly directed path and the tool remains in a lifting position, the first, second and third control means are simultaneously controlled.