Planetary Mixer Concentric Feed System
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Solution Overview
Problem
Existing concrete mixers suffer from non-uniform distribution of water and additives due to side-mounted feeding systems, leading to low-quality concrete production.
Innovation Solution
A modular planetary mixer with a concentric feed system for cement, water, and additives, featuring a radial distribution mechanism that includes an umbrella-like shower for uniform mixing, combined with decentralized gear motors for improved power distribution and a modular tank design for flexible unloading door configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a central drive unit with side-mounted feed systems is used, then the mixing capacity is improved, but the distribution uniformity of water and additives deteriorates
Solution Approach 1:
The feed system is segmented into multiple independent distribution points arranged concentrically around the central axis. Water and additives are distributed through multiple nozzles positioned at different locations (side walls, top, and bottom) rather than through a single centralized feed point, enabling uniform distribution throughout the mixing volume.
Solution Approach 2:
The feed system transitions from a two-dimensional side-mounted arrangement to a three-dimensional concentric distribution network. Feed components are introduced from multiple spatial dimensions (radial, axial, and tangential directions) to achieve comprehensive and uniform distribution throughout the mixing chamber.
2Strength
If a one-piece mixing tank with epicyclic reduction unit is used, then the structural strength is improved, but the ease of maintenance and cleaning deteriorates
Solution Approach 1:
The mixing tank is divided into modular sections that can be disassembled and reconfigured. The epicyclic reduction unit is separated from the main tank body, allowing independent access to the drive mechanism for maintenance while preserving the overall structural integrity during operation.
Solution Approach 2:
The mixer design incorporates movable and adjustable components, including adjustable unloading doors and accessible maintenance hatches, that allow the static strong structure to become dynamically accessible for maintenance and cleaning operations without compromising structural strength.
3Device complexity
If side-mounted water distribution components are used, then the device complexity is reduced, but the manufacturing precision of concrete production deteriorates
Solution Approach 1:
The concentric distribution system serves multiple functions simultaneously: it distributes water, cement, and additives through integrated nozzles; provides structural support for the feed mechanisms; and creates optimal flow patterns for uniform mixing. This multi-functionality achieves high precision distribution without proportionally increasing device complexity.
Data Source
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AI summary
A planetary mixer for the production of concrete at construction sites or similar and at the sites of the manufacturers of prefabricated elements, where the mixer comprises a tank (21) fitted with a fixed reduction gear unit (22) carrying the mixing means and their actuating components and where the upper central part of the fixed body (22) has a feeder unit (24) where the system for distributing water, cement and additives (24) is fixed to the fixed reduction gear body (22) and comprises a series of concentric pipes where the first, innermost pipe (33) is for the passage of cement, the outer concentric pipe (34) is for dust extraction and, being concentric with the cement pipe, limits the formation of cement dusts, and the last, outermost concentric pipe (35) which is used for feeding in water and which thanks to a sector (36) with a cone-shaped lower edge, distributes an umbrella-like shower of water and additives radially over the entire surface of the tank through the openings (37) located at regular intervals; additives enter the water pipe through the connectors (17).