Waterproof Driver Unit Structure for Hygienic Combination Weighers
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Solution Overview
Problem
Existing combination weighing apparatuses face issues with waterproofing of components other than the base, risk of bacteria propagation during cleaning, and time-consuming maintenance due to hoppers being attached to the same driver unit, requiring removal of both even when only one is faulty.
Innovation Solution
A waterproof structure is implemented with removable hoppers and driver units featuring metallic cases, elastic sealing members, and drainage paths to prevent water penetration and bacteria propagation, allowing individual maintenance of faulty units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple hoppers are attached to the same driver unit, then device complexity is reduced, but maintenance time increases significantly when one hopper needs repair
Solution Approach 1:
The driver unit is segmented into independent functional modules: the driver unit base and each hopper are separable components. This allows individual hoppers to be detached and maintained independently while the driver unit remains intact, resolving the contradiction by enabling modular maintenance without requiring disassembly of the entire assembly.
Solution Approach 2:
The hopper can be extracted (removed) from the driver unit when maintenance is needed. This extraction principle allows the troubled hopper to be taken out for repair while leaving the driver unit and other hoppers operational, thereby reducing maintenance time loss without complicating the overall structure.
2Reliability
If driver units are made fully waterproof, then protection against water penetration is improved, but maintenance accessibility and ease of repair deteriorate
Solution Approach 1:
The driver unit cabinet employs a dynamic sealing system with removable covers and adjustable sealing members rather than permanent fixed seals. This allows the sealing performance to be maintained during operation while enabling easy access for maintenance by simply removing the cover, thus resolving the contradiction between waterproof reliability and ease of repair.
Solution Approach 2:
A removable cover acts as an intermediary element between the waterproof interior and the external environment. This cover provides the sealing function when closed (maintaining waterproof performance) but can be easily removed (improving maintenance accessibility), thus mediating between the two conflicting requirements.
3Reliability
If sealing members are made rigid for better sealing, then waterproofness is improved, but adaptability to manufacturing tolerances and assembly variations deteriorates
Solution Approach 1:
The sealing member uses elastic material properties rather than rigid ones, changing the physical parameter of the sealing material. This elasticity allows the seal to deform and adapt to manufacturing tolerances and assembly variations while still maintaining effective waterproof sealing, thus resolving the contradiction between sealing performance and tolerance adaptability.
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
Enhances waterproofness, maintains hygiene, and simplifies maintenance by enabling separate handling of individual driver units, reducing maintenance time and costs.
Implementation Method 1
The packing member includes an elastic sealing material and is fitted into between the unit case and the cover case so as to cover an outer circumferential surface of the unit case
Data Source
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AI summary
A combination weighing apparatus is provided that includes a center body having openings, hoppers, and driver units that open and close gates of these hoppers, in which the driver units are mounted to the openings of the center body. The cabinet of each driver unit includes a metallic unit case having an opening, a metallic cover case that covers the unit case, and a packing member that covers the outer circumferential surface of the unit case. The packing member includes an elastic sealing material and is held between the unit case and the cover case. The hoppers are each removably attached to a different one of the driver units.