Wheeled Chassis Assembly for Sorption Columns
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Solution Overview
Problem
Conventional wheeled chassis assemblies for sorption columns are costly, excessively tall, and heavy, inefficiently utilizing space in clean rooms due to their design, which hinders optimal use of volume in semiconductor industry settings.
Innovation Solution
A compact wheeled chassis assembly with wheel brackets clamped to the periphery of the vat's outer surface engaging with the inside surface of the depending foot rim, utilizing lightweight aluminum alloy castings to reduce height and weight, and featuring a V-shaped corrugation for load transmission and tilting torque support, along with a spherical recess for full-circle wheel pivoting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a conventional chassis with four wheel brackets welded thereto is used, then the sorption column can be moved, but the height and empty weight of the assembly increase significantly
Solution Approach 1:
The wheel bracket is merged with the vat structure by clamping directly to the periphery of the vat's outer surface and engaging with the depending foot rim, eliminating the need for a separate welded chassis framework. This integration reduces both height and weight while maintaining mobility function.
Solution Approach 2:
Instead of attaching wheels upward from a base chassis (conventional approach), the wheel bracket is inverted to clamp onto the outer periphery of the vat and engage with the foot rim, flipping the attachment geometry to reduce overall assembly height.
2Ease of manufacture
If a conventional welded chassis is used, then the sorption column is movable, but manufacturing costs increase
Solution Approach 1:
The wheel bracket and counter-piece are formed as castings from lightweight aluminum alloy instead of welded steel components, changing the material parameter to reduce both weight and manufacturing cost while improving ease of production.
3Reliability
If the wheel bracket engagement surfaces are curved to conform with the vat surface, then full-surface engagement is achieved, but manufacturing complexity increases
Solution Approach 1:
The curved engagement surfaces are achieved through the casting process of aluminum alloy components, allowing complex geometries to be manufactured as single pieces without assembly. The curvature parameter is optimized to conform to the vat's outer surface for full contact.
4Weight of moving object
If aluminum alloy castings are used for wheel brackets, then weight and cost are reduced, but plastic deformability increases making precision harder to maintain
Solution Approach 1:
The casting process parameters and aluminum alloy composition are optimized to achieve the desired balance between plastic deformability for tolerance compensation and sufficient dimensional accuracy for engagement surface contact.
Data Source
AI summary
A wheeled chassis assembly for a sorption column in the form of a vat (1) for cleaning waste gases has at the bottom end thereof a depending foot rim (5) and an outwardly projecting corrugation (4). Wheel mounts (14) with wheels (7) thereon are pivotally secured to wheel brackets (6). Each wheel bracket (6) has an engagement surface (16) pressed onto the outside surface of vat (1) between foot rim (5) and corrugation (4) by a counter-piece (17) engaging the inside surface of foot rim (5) and threadingly coupled to wheel bracket (6). Engagement surfaces (16 and 18) are curved to conform with the outside surface of vat (1) and the inside surface of foot rim (5), respectively. Below an engagement surface (16), a wheel bracket (6) has an annular groove (19) for receiving a foot rim (5), its upper area having an inclined curved portion (21) for engaging the corrugation (4) and shaped to conform with the configuration thereof.