Offset Pail Mixer with Safety Shroud and Drip Cup
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Solution Overview
Problem
Existing open-impeller mixers are unsafe due to exposed mechanical parts, inefficient in mixing due to single vortex creation, require cumbersome adjustments, and lack provisions for residue containment and hazardous substance evacuation.
Innovation Solution
A self-contained mixer with a four-bar linkage design that offsets the impeller axis, encloses the vessel, and includes a ventilation shroud and drip cup system for safe operation and residue containment, with integrated connections for hazardous substance evacuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an open-impeller mixer design is used, then the structure is simple and easy to manufacture, but the operator safety is compromised due to exposed moving parts
Solution Approach 1:
The mixer head assembly serves multiple functions: it provides the mixing function through the impeller, acts as a safety enclosure by enclosing the moving parts, and integrates the motor mounting. This multi-functional design eliminates the need for separate guard structures while maintaining operator safety.
Solution Approach 2:
The impeller assembly is nested within the mixer head enclosure, which itself is mounted on the vessel rim. This nested arrangement allows the moving parts to be contained within a protective structure, eliminating exposed hazards while maintaining access for mixing operations.
2Ease of operation
If the impeller axis is aligned with the vessel centerline, then the mixing action is straightforward, but a single pronounced vortex is created that causes aeration
Solution Approach 1:
The impeller axis is deliberately offset from the vessel centerline by a distance between 0.05 to 0.2 times the vessel diameter. This asymmetric positioning creates multiple smaller circulation patterns instead of a single large vortex, reducing air entrainment and aeration while maintaining effective mixing action.
3Stability of the object's composition
If the impeller assembly is rigidly mounted, then the structure is stable, but manual adjustment is required at the beginning and end of each batch
Solution Approach 1:
The mixer head assembly is designed to be movable along the vessel rim rather than rigidly fixed. The four-bar linkage mechanism allows the assembly to dynamically adjust its position, automatically transitioning between retracted and operating positions without requiring manual intervention for height adjustment.
4Ease of operation
If the mixer operates in an open configuration, then access is easy, but residue drips from the impeller and shaft after mixing
Solution Approach 1:
The mixer head assembly is designed to retract completely away from the vessel opening. This extraction of the mixing components from the operational position eliminates the source of dripping residue, allowing clean removal of the assembly without contaminating the surrounding area.
5Adaptability or versatility
If separate systems are installed for support, power, and ventilation, then each function can be optimized, but the overall device complexity increases
Solution Approach 1:
The mixer head assembly integrates multiple functions into a single unified structure: the motor is mounted on the mixer head, the impeller shaft is directly coupled to the motor, and the entire assembly is supported by the four-bar linkage mechanism. This consolidation eliminates the need for separate support structures, power connections, and control systems.
Data Source
AI summary
The enclosed offset pail mixer is an invention which allows for safe, efficient and clean mixing of liquid solutions and liquid mechanical mixtures. The mixer includes a moveable head assembly that is constrained to two positions. In the operating position, the mixer geometry substantially encloses the moving parts of the mixer, preventing personnel from coming in contact with moving parts. The geometry also acts to contain dusts and vapors. A safety control circuit ensures that the impeller motor will not operate unless the vessel and the shroud are both in their respective operating position. In the operating position, the impeller shaft axis is strategically offset from the vessel axis to reduce large vortices and associated aeration. When the movable head is in the retracted position, the impeller is positioned over a removable drip cup to prevent residue from dripping on the floor or machine frame.