Rotary Filling Machine Segmented Drop Buckets
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Solution Overview
Problem
Rotary filling machines face challenges in reliably dispensing bridgeable dry materials, such as gummies and cashews, due to their tendency to clump, stick to surfaces, and bridge or clog flow paths, leading to reduced fill accuracy and potential blockages.
Innovation Solution
The rotary filling machine incorporates a rotatable fill plate with fill openings, circumferentially spaced drop buckets, and a rotating wear plate. Each drop bucket features partitions to divide the volume into discrete chambers and ridges to reduce adhesion. A stationary slide plate dilates the flow of materials, and funnel assemblies are designed to singulate the particles, preventing clumping and bridging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional rotary filling machines are used to dispense bridgeable dry materials, then the machine structure is simple and easy to manufacture, but the materials tend to clump, stick to surfaces, and bridge or clog flow paths, leading to reduced fill accuracy and potential blockages
Solution Approach 1:
The drop bucket is divided into multiple discrete chambers by partitions, with each chamber having its own fill opening. This segmentation prevents materials from bridging across the entire bucket and allows controlled dispensing from each chamber, improving fill accuracy while managing the complexity through modular design
Solution Approach 2:
A stationary slide plate is introduced between the rotating drop buckets and the funnels, creating a new dimensional interface. The slide plate features dilating openings that expand the flow path, preventing bridging by changing the geometry of the material flow path without requiring complex moving parts
2Productivity
If drop buckets with large openings are used to prevent bridging, then material flow is improved, but the fill accuracy decreases because materials cannot be precisely controlled
Solution Approach 1:
The drop bucket is segmented into multiple chambers, each with its own controlled fill opening. This allows the system to maintain smaller, more precise openings while preventing bridging through the chambered structure, thus maintaining both fill accuracy and material flow
Solution Approach 2:
The stationary slide plate acts as an intermediary between the drop buckets and funnels, providing a dilating opening that expands the flow path. This mediator allows precise control at the drop bucket level while preventing bridging at the funnel entrance, resolving the contradiction between opening size and fill accuracy
3Productivity
If materials are dispensed quickly to maintain productivity, then output increases, but clumping and bridging occur more frequently, reducing fill reliability
Solution Approach 1:
Segmenting the drop bucket into chambers allows materials to be dispensed in controlled portions from each chamber rather than all at once. This maintains high productivity through rapid rotation while preventing clumping by controlling the discharge pattern, thus improving fill reliability
Solution Approach 2:
The stationary slide plate with dilating openings changes the dimensional characteristics of the flow path, allowing rapid dispensing without creating bridge conditions. This enables high-speed operation while maintaining reliable fill performance by preventing the bridging that would otherwise occur at high speeds
Data Source
AI summary
A rotary filling machine includes a rotatable fill plate with fill openings defined therein, a plurality of circumferentially spaced drop buckets mounted above the fill plate and configured to rotate with the fill plate, and a rotating mounting plate mounted on top of the fill plate and disposed below the drop buckets. Each drop bucket includes an inner radial wall, an outer radial wall, a first sidewall, and a second sidewall surrounding a volume bounded by top and bottom openings. A coupler for each drop bucket includes a first connector, such as a socket, extending from an outer surface of the inner radial wall and a mating connector, such as a post, extending upwardly from the mounting ring. A plurality of ridges or protrusions are formed on a side surface of at least one of the walls to reduce the planar surface area available for adhesion to materials being dispensed.