Decoupled Spiral Conveyor for Continuous Coating
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Solution Overview
Problem
Conventional dragée processes are inefficient for processing small product quantities due to high complexity and limited throughput, especially when multiple process steps are required, as they involve complex machinery and limited flexibility in processing small individual charges.
Innovation Solution
A process utilizing a decoupled spiral conveyor within a rotating drum for cyclical transport of products in the axial direction, allowing for individual processing of small charges in separate chambers with adjustable processing stations and extended residence time, while maintaining continuous processing advantages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a continuous dragée process is used to maintain continuous product flow, then productivity is improved, but device complexity increases and it becomes unsuitable for processing small individual charges
Solution Approach 1:
The drum is divided into multiple processing chambers separated by partition disks, with each chamber capable of processing individual charges independently. The spiral conveyor is segmented into discrete elements that can transport product between chambers. This segmentation allows the system to handle small individual charges while maintaining continuous operation across multiple chambers.
Solution Approach 2:
The spiral conveyor is made independently drivable from the drum rotation, allowing its transport motion to be dynamically controlled and decoupled from the continuous rotary motion of the drum. This enables the spiral to transport product cyclicity between chambers while the drum continues rotating, providing dynamic control over when and how product is moved between processing stations.
2Adaptability or versatility
If multiple drums are arranged on a circular table to process small charges through multiple steps, then adaptability is improved, but device complexity increases significantly
Solution Approach 1:
Multiple processing chambers are merged into a single rotating drum, with each chamber functioning as an independent processing station. The spiral conveyor acts as a shared transport mechanism that can move product between any chambers. This merging reduces the number of separate drums and support structures needed while maintaining the capability for multi-step processing of small charges.
Solution Approach 2:
Each processing chamber can perform different process steps (coating, drying, cooling, etc.), and the spiral conveyor serves multiple functions by transporting product between different chambers at different stages of processing. This multi-functionality allows a single drum system to replace what would traditionally require multiple specialized drums arranged on a circular table.
3Device complexity
If the spiral conveyor is coupled to the drum rotation to simplify the drive mechanism, then device complexity is reduced, but the ability to extend residence time and control transport is limited
Solution Approach 1:
The transport function of the spiral conveyor is extracted from the drum rotation mechanism. The spiral conveyor is mounted on a separate independent drive system, allowing it to be controlled separately from the drum rotation. This extraction enables independent control of product transport timing and speed, allowing residence time to be extended or reduced as needed without being constrained by the drum's rotational speed.
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
Enables efficient processing of small individual charges with greater flexibility and reduced complexity, allowing for customizable process steps and easier cleaning of the apparatus, by decoupling the spiral conveyor from the drum's rotary motion and using it to transport products between processing stations as needed.
Implementation Method 1
A longitudinal conveyor (for example, a spiral) which is decoupled from the rotary motion of the drum transports the material in the axial direction through the drum in a clocked or cyclical transport mode
Data Source
AI summary
Continuously coating cores by a dragee-making apparatus including at least one rotatably driven drum in which the product is coated with one or several coating materials or is subjected to other treatment processes. The charge of the product to be processed divided into small individual charges at the inlet end of the drum is conveyed through the drum in a clocked manner and treated in individual treatment chambers separated from each other. The longitudinal conveyor that conveys the individual charges through the drum embodies the individual treatment chambers in connection with the inner wall of the drum. The products to be treated constantly rotate in the revolving drum without being conveyed in the longitudinal direction, the longitudinal conveyor located in the drum conveying the product from one treatment station to the next as required. A passage is formed from one chamber to the adjacent, other chamber if necessary.