Vacuum Gripper Valve Control for Small-Article Pickup
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Solution Overview
Problem
Existing automated vacuum handling systems struggle with flexibility when handling articles of varying shapes and sizes, particularly when articles are smaller than the gripping surface, leading to potential loss of suction due to air entry and the need for oversized vacuum generators, which increases costs and dimensions.
Innovation Solution
A control method for a handling system using a vacuum gripping device with valve assemblies that include a shutter and compensation hole, allowing for automatic closure and stable grip through a tilting mechanism, enabling effective handling of smaller articles without increasing system size or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the gripping surface is made large to handle various sized articles, then versatility is improved, but when articles are much smaller than the gripping surface, air enters through unoccupied areas causing loss of suction and grip reliability
Solution Approach 1:
The gripping surface is divided into multiple independent suction zones, each with its own valve assembly. This segmentation allows each zone to independently maintain vacuum pressure and prevent air leakage, ensuring reliable grip even when handling small articles that occupy only part of the gripping surface.
Solution Approach 2:
Valve assemblies are introduced as intermediary elements between the suction hood and the external environment. These valves automatically close when vacuum pressure is applied, preventing air from entering through unoccupied areas of the gripping surface, thus maintaining suction reliability without requiring a smaller gripping surface.
2Reliability
If self-closing valves are added to prevent air entry, then grip reliability is improved, but system complexity and manufacturing cost increase
Solution Approach 1:
The valve assemblies are designed to automatically open and close based on vacuum pressure conditions without requiring external control mechanisms. When vacuum pressure is applied, the valves self-close to prevent air entry; when vacuum is released, they self-open. This self-service mechanism maintains reliability while minimizing added complexity.
3Reliability
If a powerful vacuum generator is used to maintain suction with large unoccupied gripping surface areas, then grip reliability is improved, but system cost and dimensions increase
Solution Approach 1:
By segmenting the gripping surface into independent suction zones with individual valve assemblies, the system prevents air leakage at the zone level rather than requiring a single powerful vacuum generator to compensate for leaks across the entire surface. This allows the use of a smaller, more cost-effective vacuum generator while maintaining grip 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 stable grip on articles much smaller than the gripping surface while maintaining system costs and dimensions, allowing handling of articles regardless of orientation and ensuring reliable pick-up even when articles are inclined.
Implementation Method 1
a vacuum generating unit (8) that can be operated to generate a given depression in said suction chamber (6)
Implementation Method 2
rotating said vacuum depression gripping device (5) by an angle of approximately at least 90° so that said shutter (14) moves, by gravity, from said second position to said first position
Implementation Method 3
a layer (18) made of a flexible material interposed between said suction chamber (6) and said gripping surface (9)... said layer (18) of flexible material deforms at least partially to compensate for any roughness of said at least one wall
Data Source
Figure 1
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AI summary
A control method for controlling a handling system (1) comprising a support structure (4) carrying a gripping device (5) which, in turn, comprises a suction chamber (6), a vacuum generating unit (8), a gripping surface (9), and a plurality of valve assemblies (11), each provided with a duct (13), a shutter (14) movable in the respective duct (13) between a first position and a second position to prevent or enable the fluidic connection between the duct (13) and the suction chamber (6), and a compensation hole (15); the method comprises: tilting the gripping device (5) with respect to the horizontal direction to conduct the shutter (14) towards the first position; activating the generating unit (8) so as to exert a first suction action on the shutter element (14), in order to hold the same in the first position; and bring the gripping surface (9) into contact with the article (3) to be picked up so as to bring the shutter (14) into the second position and transmit the gripping action to the article (3).