Vacuum Gripper Seal Detection for Stable Robotic Grasping
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Solution Overview
Problem
Existing robotic grippers face challenges in achieving high-quality grasps due to vacuum assemblies forming poor seals, which can lead to inefficient and unstable grasping of objects, particularly with deformable or non-uniform surfaces.
Innovation Solution
A method involving the activation, deactivation, and reactivation of vacuum assemblies based on seal quality, using pressure levels and dwell times to optimize the number of vacuum assemblies forming a seal, enhancing grasp quality and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If all vacuum assemblies are continuously activated, then the lifting capacity is maximized, but the grasp stability deteriorates due to poor seal formation on irregular surfaces
Solution Approach 1:
The system dynamically adjusts the activation state of vacuum assemblies based on real-time seal quality feedback. Vacuum assemblies are alternately activated and deactivated during the grasp process, transitioning from a static to a dynamic control strategy that adapts to surface irregularities and maintains optimal grasp stability while preserving lifting capacity.
Solution Approach 2:
The system implements feedback control by monitoring seal quality metrics and using this information to adjust vacuum assembly activation states. Seal quality data feeds back to the control system, which then optimizes which vacuum assemblies remain active, creating a closed-loop control mechanism that simultaneously maintains lifting capacity and improves grasp stability.
2Reliability
If vacuum assemblies are deactivated based on initial seal quality, then the grasp stability improves, but the lifting capacity decreases due to fewer active vacuum assemblies
Solution Approach 1:
The system employs periodic reactivation of previously deactivated vacuum assemblies at predetermined intervals during the grasp process. This periodic action allows vacuum assemblies that initially failed to seal to be given another opportunity to form seals as the object surface deforms or settles, thereby recovering lifting capacity while maintaining the stability benefits of selective deactivation.
Solution Approach 2:
The system performs preliminary deactivation of vacuum assemblies with poor seal quality before the actual lifting operation begins. This preliminary action eliminates unstable connections that would compromise grasp stability, while the subsequent periodic reactivation ensures that potentially viable vacuum assemblies are not permanently lost, balancing stability and capacity.
3Reliability
If vacuum assemblies are reactivated frequently, then the seal quality improves due to surface deformation, but the energy consumption increases
Solution Approach 1:
The system implements periodic reactivation of vacuum assemblies at predetermined intervals rather than continuous reactivation. This periodic approach allows the object surface to deform naturally between reactivation events, improving seal quality without requiring constant energy input. The interval between reactivations is optimized to balance seal improvement with energy conservation.
Solution Approach 2:
The system maintains continuous grasp functionality by keeping certain vacuum assemblies activated while periodically reactivating others. This continuity ensures that lifting capacity is maintained throughout the process while energy is conserved by avoiding unnecessary reactivation cycles. The system sustains useful action through a combination of permanently active and temporarily deactivated assemblies.
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
Improves grasp quality and stability by ensuring a larger number of vacuum assemblies form effective seals, even with transient surface changes, thereby increasing lifting capacity and grasp efficiency.
Implementation Method 1
a vacuum assembly may initially fail to make a good seal with the object and may be deactivated, but may later be capable of making a good seal (or better seal) if it were activated
Implementation Method 2
For a robotic manipulator with a vacuum-based gripper, grasp quality may be related to the number of vacuum assemblies of the gripper that are able to form a good seal with the object being manipulated
Data Source
AI summary
Some robotic arms may include vacuum-based grippers. Detecting the seal quality between each vacuum assembly of the gripper and a grasped object may enable reactivation of some vacuum assemblies, thereby improving the grasp. One embodiment of a method may include activating each of a plurality of vacuum assemblies of a robotic gripper by supplying a vacuum to each vacuum assembly, determining, for each of the activated vacuum assemblies, a first respective seal quality of the vacuum assembly with a first grasped object, deactivating one or more of the activated vacuum assemblies based, at least in part, on the first respective seal qualities, and reactivating each of the deactivated vacuum assemblies within a reactivation interval.