Cable Robot Parallelogram Stability
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Solution Overview
Problem
Cable robots suspended by cables alone lack stability, especially when subjected to forces and torques, limiting their ability to maintain orientation and precision in large-scale applications like 3D printing and industrial tasks.
Innovation Solution
The use of at least three groups of three cables arranged in a parallelogram manner, with cable actuation and uptake located within the robotic platform, enhances stability by providing gravity-stabilized resistance to forces and torques, and includes a motion controller for precise control of cable lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If cable robots are suspended by cables only, then mobility in large space is improved, but stability when subjected to forces and torques deteriorates
Solution Approach 1:
The patent applies the counterweight principle by adding a weight component to the robotic platform that generates a gravitational force opposing the destabilizing effects of external forces and torques. This weight creates a restoring moment that enhances platform stability and maintains orientation, directly resolving the contradiction between mobility and stability.
2Stability of the object's composition
If lower stabilizing cables are added to improve stability, then platform stability improves, but mobility advantage deteriorates
Solution Approach 1:
The patent extracts and eliminates the lower stabilizing cables from the system, replacing them with a weight-based stabilization mechanism. This removal simplifies the cable system while maintaining stability through gravitational counterweight, resolving the contradiction between stability and device complexity.
Solution Approach 2:
The patent substitutes the mechanical cable-based stabilization system with a gravitational field-based solution. Instead of using additional cables to provide stabilizing forces, the system uses the gravitational force on a weight component to achieve stability, replacing a complex mechanical system with a simpler physical field-based approach.
3Ease of manufacture
If cable actuation and uptake are located within the robotic platform, then installation simplification and component centralization improve, but platform weight increases
Solution Approach 1:
The patent merges the cable actuation and uptake components directly into the robotic platform structure, consolidating multiple functions into a single integrated unit. This centralization simplifies installation and maintenance while the added weight is acceptable given the stability benefits and the fact that it becomes part of the operational platform mass.
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 configuration significantly improves stability, allowing the robotic platform to maintain orientation and precision in 3D environments, enabling effective use in large-scale applications such as 3D printing and industrial tasks while simplifying installation and centralizing components.
Implementation Method 1
each cable group can extend between the platform member and a wall or ceiling anchor to provide the platform with gravity stabilized resistance to motion from forces and torques acting on the platform
Data Source
AI summary
A suspension cable robot is provided, its stability can be improved by using at least three groups of three cables arranged in a parallelogram manner. The ability to remain stable when subjected to forces acting on the robot platform or end effector is thereby significantly increased.