Suction Nozzle Slit Design for Reliable Component Release
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Solution Overview
Problem
Existing suction nozzles face challenges in reliably canceling the suction state of components, particularly those with dome shapes or flexible/adhesive surfaces, due to the component-remained-on-nozzle phenomenon, which requires further improvement.
Innovation Solution
A suction nozzle design featuring a tip portion with an opening area larger than the airflow path and a slit on the circumferential contact surface, where the slit has a ratio of opening area to sectional area of 40% or more, and a taper portion connecting the slit to the flow path, to enhance airflow and reduce the ejector effect, allowing for more reliable component separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional suction nozzle with a simple tubular structure is used, then the device complexity is low, but the reliability of suction canceling is insufficient for certain component types
Solution Approach 1:
The nozzle is divided into distinct functional segments: a main body tubular portion and a separate tip portion with the opening portion. The tip portion can be detached or adjusted, allowing optimization of the suction canceling function without complicating the entire nozzle structure. This segmentation enables the tip portion to be specifically designed with the opening portion and slits for reliable component release.
Solution Approach 2:
The opening portion is strategically positioned at a specific location on the tip portion where it contacts the component. This local modification creates a concentrated airflow path that efficiently cancels suction at the critical contact point. The slits are also positioned locally on the circumferential contact surface to enhance the component separation effect without requiring changes to the entire nozzle structure.
2Reliability
If the opening portion area is increased to improve suction canceling, then the suction canceling effectiveness is improved, but the airflow path area ratio changes
Solution Approach 1:
The design optimizes the ratio between the opening portion area and the airflow path area. By controlling this parameter ratio, the system achieves effective suction canceling while maintaining sufficient airflow for component pickup. The opening portion area is set to be larger than the airflow path area to ensure effective suction canceling, but the overall design balances these areas to maintain proper airflow characteristics.
Solution Approach 2:
The system utilizes pneumatic principles to control airflow through the opening portion and slits. The airflow path is designed to create a controlled air curtain or pressure distribution that effectively releases the component from the nozzle. The pneumatic design ensures that the air flow is sufficient to cancel suction while maintaining efficiency in the air consumption.
3Reliability
If slits are added to the circumferential contact surface, then the suction canceling is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The tip portion is designed as a separate segment that can be manufactured with the slits integrated into its structure. This segmentation allows the slits to be formed using specialized manufacturing processes for the tip portion without requiring high-precision machining of the entire nozzle. The tip portion can be attached to the main body, isolating the slit manufacturing to a localized area where precision requirements can be better managed.
Solution Approach 2:
The design specifies that the opening area of the slits should be 40% or more of the airflow path sectional area. This parameter specification provides a clear design criterion that guides manufacturing while ensuring effective suction canceling. By defining this area ratio parameter, the invention balances the need for effective component release with practical manufacturing capabilities, avoiding excessively tight tolerance requirements.
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
The design effectively suppresses the ejector effect and ensures reliable suction canceling of components, even at lower exhaust pressures, improving the separation efficiency for dome-shaped and flexible/adhesive components.
Implementation Method 1
since the air supplied from the air pipe flows out through the slit, the suction state of the component can be canceled from the position of the slit as the base point
Implementation Method 2
the suction nozzle can further suppress generation of airflow of exhaust and intake (also referred to as ejector effect) generated in a gap between the component and the tip portion
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
In a suction nozzle 30, a tip portion 33 of an air pipe 31 includes an opening portion 29 having an area larger than that of a flow path 32 of the air pipe 31, and a slit 37 which is formed on the tip portion 33 of the air pipe 31 is provided in a portion of a circumferential contact surface 34 contacting the component 60. In this suction nozzle 30, since air supplied from the air pipe 31 flows out through the slit 37, the suction state of the component 60 is canceled from the position of the slit 37 as a base point.