Suction Nozzle Resistance Cavity for Component Release
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Solution Overview
Problem
Suction nozzles with suction pad portions often experience a 'bringing-back' phenomenon where components fail to separate from the nozzle after being mounted on a board, due to incomplete suction release.
Innovation Solution
The suction nozzle incorporates a resistance cavity with a slit shape, formed between the air flow path and the suction pad portion, which reduces air flow speed when positive pressure is applied, preventing the component from being peeled off from the board during suction release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a suction nozzle with a suction pad portion is used to suck components, then components can be held and transferred, but a bringing-back phenomenon occurs where components fail to separate from the nozzle after mounting
Solution Approach 1:
The suction pad portion is divided into a suction surface and a release surface, with the release surface featuring protrusions that create localized pressure distribution. This segmentation allows different regions of the suction pad to perform different functions: the suction surface holds the component while the release surface with protrusions enables controlled release without causing the bringing-back phenomenon.
Solution Approach 2:
The release surface of the suction pad portion is designed with protrusions that create localized high-pressure regions. This local quality change ensures that positive pressure is applied at specific points rather than uniformly across the entire surface, preventing the generation of peeling forces that would cause the bringing-back phenomenon while maintaining reliable component release.
2Ease of operation
If positive pressure is applied to release suction, then component release should occur, but rising air flow generates peeling force that prevents separation
Solution Approach 1:
The release surface incorporates protrusions that create localized pressure application points. This ensures that positive pressure is concentrated at specific locations rather than distributed uniformly, allowing component release to occur through localized forcing rather than through rising air flows that generate harmful peeling forces across the component surface.
Solution Approach 2:
The design converts the potential harmful effect of rising air flows into a beneficial localized pressure application. By using protrusions on the release surface, the air flow is directed to create focused positive pressure at contact points, which enables reliable component release without generating the peeling forces that would otherwise occur with uniform air distribution.
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 design ensures reliable suction release of components by suppressing air flow speed and distributing positive pressure over a wider area, reducing the likelihood of the component being pulled off the board, thus enhancing the component's detachment process.
Implementation Method 1
the resistance cavity which causes resistance and decreases air flow speed when a positive pressure is applied
Implementation Method 2
a component is sucked by a negative pressure
Implementation Method 3
a positive pressure is applied to release the suction of the component
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
An suction nozzle 30 includes a suction pad portion 33 at a tip of an air pipe 31 formed to be larger than the air pipe 31, in which a resistance cavity 38 which causes resistance and decreases air flow speed when a positive pressure is applied is formed between a flow path 32 and a cavity portion 35. In the suction nozzle 30, since the resistance cavity 38 is formed, a positive pressure is applied by the air whose flow speed is suppressed and the suction release of the component P is performed. The resistance cavity 38 may be a cavity having a slit shape.