Vending Machine Impeller Snap-Fit Assembly for Easy Cleaning
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Solution Overview
Problem
Existing beverage vending machine mixers have complex and accuracy-dependent impeller assembly mechanisms, which complicate cleaning and are often located in poorly illuminated, hard-to-reach areas.
Innovation Solution
A mixer design featuring a removable impeller connection system with a click-on retaining device and a cross-shaped hole that allows easy alignment and assembly, reducing the complexity and improving accessibility for cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex impeller connection system is used to ensure reliable removable connection, then the connection reliability is improved, but the device complexity and assembly difficulty increase
Solution Approach 1:
The impeller connection system is segmented into distinct functional elements: the drive shaft with circumferential groove, the impeller hub with corresponding protrusion, and the snap-acting retaining mechanism. This segmentation allows each element to perform its specific function independently while simplifying the overall assembly process through modular design.
Solution Approach 2:
The retaining device utilizes elastic elements that automatically engage with the drive shaft groove when the impeller is assembled, providing self-locking functionality without requiring additional fastening operations. The elastic retention means automatically maintains the impeller on the drive shaft through its inherent elasticity, eliminating the need for complex fastening mechanisms.
2Reliability
If frequent cleaning is required to maintain hygiene, then the cleaning frequency is increased, but the maintenance time and operational disruption increase
Solution Approach 1:
The mixing body is divided into separable components including the mixing chamber, blending chamber, and impeller assembly. This segmentation enables the impeller and blending chamber to be quickly removed as a unit for cleaning, significantly reducing the time required compared to cleaning a monolithic structure.
Solution Approach 2:
The connection system transitions from a static fixed connection to a dynamic removable connection. The impeller can be quickly assembled and disassembled from the drive shaft using the snap-action retaining device, allowing rapid access for cleaning operations without requiring complex tools or procedures.
3Adaptability or versatility
If the mixer is located in a poorly illuminated hard-to-reach area to optimize space, then the space utilization is improved, but the ease of operation and assembly difficulty worsen
Solution Approach 1:
The alignment features including the cross-shaped hole and protrusion geometry provide self-aligning functionality that guides the impeller into the correct position on the drive shaft. This self-alignment eliminates the need for precise manual positioning or complex alignment procedures, making assembly intuitive even in difficult-to-reach locations.
Solution Approach 2:
The complex mechanical alignment and retention system is replaced with a simplified snap-fit mechanism using elastic retention means. This substitution eliminates the need for precision mechanical adjustments or specialized tools, allowing assembly to be performed through simple insertion and automatic engagement, suitable for confined spaces.
Data Source
Figure 1
Figure 2
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AI summary
A mixer (1) for a beverage vending machine (2), wherein the mixer (1) has a blender (22) in turn having an impeller (21) housed inside a blending chamber (11) and fitted removably to a drive shaft (23) to rotate about an axis (24); the drive shaft (23) having an end portion (26) in turn having two parallel flat faces (27) on opposite sides of the axis (24); the impeller (21) having a hub (30) in turn having at least two substantially rectangular-section seats (41) coaxial with each other and with the axis (24), and each designed to receive the end portion (26) of the drive shaft (23) in sliding and angularly fixed manner,- and one of the two seats (41) being engaged by the end portion (26) of the drive shaft (23).