Parallel-Kinematic Machine with Gyro Stabilized Beams
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Solution Overview
Problem
Conventional parallel-kinematical machines lack the necessary rigidity and accuracy due to their design, which results in reduced mobility and increased manufacturing costs, as they rely on a central tube to manage rotational and bending stresses.
Innovation Solution
The design eliminates the central tube by incorporating at least three setting devices connected to a positioning head via a universal joint and additional reinforcing beams with limited degrees of freedom, allowing for greater flexibility and rigidity without increasing weight or costs, using materials like carbon fiber for the beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a central tube is used to manage rotational and bending stresses, then the machine can maintain structural integrity, but the machine weight increases and mobility decreases
Solution Approach 1:
The patent removes the central tube from the machine structure entirely. Instead of using a central tube to manage rotational and bending stresses, the invention distributes these stress management functions to individual setting devices, each equipped with its own universal joint and gyro device, thereby eliminating the heavy central tube component and reducing overall machine weight while maintaining structural integrity
Solution Approach 2:
The patent divides the stress management function from a centralized system into distributed segments. Each setting device becomes an independent unit with its own universal joint and gyro device for handling rotational and bending stresses, rather than relying on a single central tube. This segmentation allows each component to be optimized independently and reduces the total weight of the structure
2Stability of the object's composition
If stricter tolerances are applied in each joint to enhance rigidity, then machine rigidity improves, but manufacturing costs increase
Solution Approach 1:
The patent changes the kinematic parameters of the joints by introducing universal joints with gyro devices that provide two degrees of freedom. This parameter change allows the joints to accommodate movements and stresses more effectively, maintaining machine rigidity through the gyro stabilization mechanism rather than relying on strictly tight tolerances, thereby reducing manufacturing costs while preserving rigidity
3Stability of the object's composition
If a more robust central tube is used (stiffer material, increased thickness or diameter), then rigidity improves, but machine weight increases and working area decreases
Solution Approach 1:
The patent extracts the rigidity function from the central tube and redistributes it to individual setting devices. Each setting device incorporates a universal joint with a gyro device that provides rotational freedom while maintaining stability through gyroscopic effects. This eliminates the need for a heavy, robust central tube while preserving the necessary rigidity and maximizing the working area
Solution Approach 2:
The patent introduces dynamic stabilization through gyro devices in each universal joint. Instead of relying on the static rigidity of a heavy central tube, the system uses dynamic gyroscopic stabilization to maintain rigidity while allowing rotational movements. This dynamic approach enables the machine to maintain rigidity with lighter components and a larger working area
4Strength
If the central tube design is used, then rotational forces and bending stresses are managed, but the positioning head mobility within working range is reduced
Solution Approach 1:
The patent segments the stress management function across multiple independent setting devices, each with its own universal joint and gyro device. This segmentation allows each setting device to independently manage its own rotational and bending stresses while providing full mobility to the positioning head within the working range, eliminating the mobility constraints imposed by a rigid central tube structure
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 enhances the machine's rigidity and accuracy while reducing moving mass and maintaining low manufacturing costs, allowing for improved mobility of the positioning head within its working range.
Implementation Method 1
Each setting device is also connected to the base via a universal joint in the form of a gyro device, which has two degrees of freedom
Data Source
AI summary
A parallel-kinematical machine includes at least three length adjusting setting devices that are connected to a positioning head and a base. The positioning head is movable in response to manuvering of the setting devices. At least movable two reinforcing beams are connected to the positioning head via beam rotation bearings having one degree of freedom, and are adapted to slide transversely in the beam bearings with adjustments of the setting devices. Each beam bearing is connected to the base via a beam-universal-joint. The beam bearing of at least one movable reinforcing beam is connected to an inner gyro element mounted in an outer gyro element, and rotatable about inner and outer gyro axes of the inner and outer gyro elements, so as to be partly rotatable about an axis that parallels the longitudinal axis of the movable reinforcing beam.