Cable-Driven Parallel Robot Tension Control for 3D Printing
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Solution Overview
Problem
Conventional 3D printers using rigid beams face limitations in size due to increased weight and inertia, leading to decreased speed and accuracy, while cable-driven robots suffer from cable sag and tension issues affecting positional accuracy.
Innovation Solution
A cable-driven parallel robot system with rotors, supports, and effectors, where cables are tension-controlled by motors to maintain precision and accuracy, utilizing winch drums and computational equipment for calibration and movement control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid beams are used to increase print space size, then the structural strength and stability are improved, but the weight and inertia increase leading to decreased speed and accuracy
Solution Approach 1:
The patent replaces rigid beams with flexible cables to support the printing system. The cables are tension-controlled to maintain structural stability while being significantly lighter than rigid beams, thus reducing inertia and enabling faster movement and higher printing speed without sacrificing structural integrity.
2Adaptability or versatility
If cable length is increased to expand workspace, then the print space flexibility is improved, but cable sag increases affecting positional accuracy
Solution Approach 1:
The patent employs sensors to detect cable length and tension in real-time, feeding this information back to the control system. The control system dynamically adjusts motor tension to compensate for cable sag, maintaining positional accuracy even with extended cable lengths and larger workspace flexibility.
Solution Approach 2:
The patent dynamically changes cable tension parameters through motor control to compensate for variations in cable length and sag. By adjusting tension forces in real-time, the system maintains manufacturing precision across varying workspace configurations and cable lengths.
3Manufacturing precision
If cable tension is increased to reduce sag, then the positional accuracy is improved, but the load distribution becomes uneven affecting system reliability
Solution Approach 1:
The patent uses sensors to monitor cable tension and position, providing feedback to the control system. The control system dynamically adjusts individual cable tensions to maintain positional accuracy while ensuring balanced load distribution across all cables, preventing any single cable from being overloaded and thus maintaining system reliability.
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
Enables a lightweight, high-speed, and accurate 3D printing system with improved size flexibility, reduced inertia, and precise load distribution, overcoming the limitations of traditional Cartesian robots and cable sag issues.
Implementation Method 1
The first rotor controls tension to the first set of cables and the second rotor controls tension to the second set of cables for moving the horizontal planar location
Data Source
AI summary
A cable-driven parallel robot (CDPR) includes at least two sets of rotors each coupled to a respective one of at least two supports, the sets of the rotors positioned above a surface; an effector positioned at a horizontal planar location between the sets of the rotors and at a vertical location above the surface; and at least two sets of cables each coupled to a respective one of the sets of the rotors at first ends of the respective set of the cables and to the effector at second ends of the respective set of the cables. Each set of the sets of the rotors controls tension to the respective one set of the sets of the cables for moving the horizontal planar location. Each set of the sets of the rotors is vertically movable on the respective one of the supports for moving the vertical location when the sets of the rotors are vertically moved synchronously.