Vacuum Gripper Seal Detection for Dynamic Suction Reactivation
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Solution Overview
Problem
Existing robotic grippers with vacuum-based systems face challenges in maintaining a high-quality grasp due to inconsistent seal formation by vacuum assemblies, particularly when dealing with deformable or irregular surfaces, leading to inefficient and potentially unsafe operation in logistics scenarios.
Innovation Solution
A method involving the activation, deactivation, and reactivation of vacuum assemblies based on seal quality, using pressure sensing and controlled vacuum management to enhance the number of assemblies forming a good seal, thereby improving grasp quality and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If all vacuum assemblies are continuously activated, then the grasp force is maximized, but the reliability decreases due to poor seal formation on deformable surfaces
Solution Approach 1:
The system dynamically adjusts the activation state of vacuum assemblies based on real-time seal quality feedback. Vacuum assemblies are activated when good seal potential is detected and deactivated when poor seal is detected, creating a dynamic adaptation to surface conditions that maintains both grasp force and reliability
Solution Approach 2:
Pressure sensors provide continuous feedback on seal quality to the controller, which then adjusts vacuum assembly activation states accordingly. This closed-loop feedback system enables the gripper to maintain optimal grasp force while avoiding activation of assemblies that would not form reliable seals
2Reliability
If vacuum assemblies are deactivated based on seal quality, then the reliability improves, but the grasp force decreases due to fewer active assemblies
Solution Approach 1:
The system continuously monitors seal quality and dynamically reactivates vacuum assemblies when conditions improve. This dynamic adjustment ensures that assemblies are deactivated only when necessary for reliability, and reactivated when they can contribute to grasp force, balancing both objectives
Solution Approach 2:
The system periodically reassesses seal quality of deactivated vacuum assemblies and reacts them when conditions warrant. This periodic reevaluation allows the system to capture opportunities for additional grasp force while maintaining reliability through conditional activation
3Reliability
If vacuum assemblies are repeatedly activated and deactivated, then the seal quality improves through adaptive engagement, but the time consumption increases
Solution Approach 1:
The system performs preliminary activation of vacuum assemblies before final grasp confirmation. This preliminary action allows the system to identify and deactivate assemblies with poor seal potential early in the process, reducing the need for repeated activation-deactivation cycles and minimizing time loss
Solution Approach 2:
Pressure sensors automatically detect seal quality and trigger appropriate activation/deactivation decisions without requiring external intervention or complex control algorithms. This self-service approach streamlines the adaptation process and reduces time consumption
4Measurement precision
If pressure sensing is used to detect seal quality, then the measurement precision improves, but the device complexity increases due to additional sensors and control logic
Solution Approach 1:
The pressure sensors serve dual purposes: detecting seal quality and providing feedback for control decisions. This self-service approach eliminates the need for separate detection and control systems, maintaining measurement precision while minimizing the increase in device complexity
Solution Approach 2:
The pressure sensing system is integrated into the existing vacuum assembly structure, allowing the same components to serve both structural and sensing functions. This multi-functionality reduces overall system complexity while maintaining high measurement precision for seal quality detection
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 approach enhances grasp quality and efficiency by dynamically adjusting vacuum assembly engagement, allowing for better handling of deformable and irregular surfaces, and ensuring consistent grasp performance.
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
determining, for each of the activated vacuum assemblies, a first respective seal quality of the vacuum assembly
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.