Micronutrient Granule Production with Two-Stage Dust-Control Screening
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Solution Overview
Problem
Existing methods for preparing micronutrient supplement granules are complex, costly, and result in low-strength granules with high dust production, posing health and environmental risks.
Innovation Solution
An apparatus comprising a tablet press, first and second grinding and granulating machines, and a two-stage screening unit with square-mesh and round-mesh screens, along with vacuum feeders to minimize dust and enhance granule strength and purity, utilizing internal material circulation for improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple powders are separately weighed and mixed in a mixer, then mixing can be performed, but trace elements may be contaminated by cross-contamination from other powders and manufacturing equipment
Solution Approach 1:
The mixing device is divided into multiple independent mixing chambers, each dedicated to mixing a specific powder. This segmentation prevents cross-contamination between different powders by physically isolating them in separate chambers, while still allowing centralized control and operation of the mixing system.
Solution Approach 2:
A movable partition wall is introduced as an intermediary structure between mixing chambers. This partition can be positioned to isolate specific chambers, preventing contamination spread while allowing controlled access. The partition acts as a mediator that maintains separation between different powder materials during the mixing process.
2Manufacturing precision
If powders are transferred between containers using spoons or funnels, then transfer can be achieved, but trace elements may be contaminated by contact with spoons, funnels, and container interiors
Solution Approach 1:
The harmful transfer tools (spoons, funnels) are completely removed from the system. Instead, powders are transferred directly from storage containers into the mixing chambers through designed openings, eliminating the intermediate transfer step that would introduce contamination from tools and container surfaces.
Solution Approach 2:
The mixing chamber design allows powders to be directly deposited into the mixing area without requiring external transfer tools. The chamber structure itself facilitates the transfer process, making the system self-sufficient and eliminating dependence on contaminating tools.
3Manufacturing precision
If trace element powders are exposed to air during weighing and mixing, then handling can be performed, but the powders may be contaminated by dust and other airborne particles
Solution Approach 1:
The mixing chambers are equipped with sealed covers that create a protected environment. This sealed inert environment prevents airborne dust and contaminants from entering the mixing area during the weighing and mixing processes, while still allowing controlled access for operation.
4Manufacturing precision
If conventional mixing equipment is used, then mixing can be performed, but the equipment itself may contaminate the powders with dust and debris
Solution Approach 1:
The mixing chambers are designed with easily cleanable surfaces and removable parts that can be thoroughly sanitized between uses. The design prioritizes ease of cleaning over permanent durability, allowing the equipment to be rapidly prepared for the next use without risking contamination, effectively treating the equipment as disposable in terms of contamination risk.
Data Source
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AI summary
A method and an apparatus for preparation of micronutrient supplement granules are provided. The preparation method comprises physically extruding, grinding and screening a micronutrient to obtain micronutrient supplement granules with a granule diameter of 35 µm to 380 µm and granule strength of greater than 10 N. The preparation method has low cost, and the strength of the product obtained is high. The preparation apparatus includes a tablet press, a first grinding and granulating machine, and a screening unit, in which a discharge end of the tablet press is connected with a feed end of the first grinding and granulating machine, a discharge end of the first grinding and granulating machine is connected to the feed end of the screening unit, the screening unit includes a primary screening machine and a secondary screening machine, a feed end of the primary screening machine is connected to the discharge end of the first grinding and granulating machine, and the discharge end of the primary screening machine is connected to the feed end of the secondary screening machine, in which a screen of the primary screening machine is a square-mesh screen, and a screen of the secondary screening machine is a round-mesh screen. The apparatus has high production efficiency, and the quality of the obtained product is high.