Freeze Dryer Loading Carriage With Linear Motor Drive
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Solution Overview
Problem
Existing freeze drying systems face challenges in upgrading from manual to automated loading and unloading processes, particularly due to temperature sensitivity and the need for aseptic conditions, making it difficult to retrofit systems for efficient and sterile operation.
Innovation Solution
A loading and unloading device with a carriage and guides that form guiding edges within the drying chamber, utilizing a linear motor drive with smooth, encapsulated components for easy cleaning and sterilization, allowing for independent movement and adjustment to support drying vessels during loading and unloading, and a bridge part for conveying vessels outside the chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated loading and unloading devices are integrated into freeze drying systems, then productivity and automation extent are improved, but device complexity and upgrade cost increase
Solution Approach 1:
The loading and unloading device is divided into independent modular components: a carriage with feeding elements, separate guiding edges, and individual drive units. This segmentation allows each component to be optimized independently and facilitates easier integration into existing freeze drying systems, reducing overall system complexity while maintaining high productivity.
Solution Approach 2:
The device employs dynamic elements including a movable carriage that can be positioned at different locations within the drying chamber, adjustable guiding edges that adapt to various vessel configurations, and programmable feeding mechanisms. This dynamic design enables the system to handle different product types and chamber layouts, improving productivity without requiring a completely new system design.
2Loss of time
If loading and unloading operations are automated, then loss of time is reduced, but ease of operation and cleaning accessibility worsen
Solution Approach 1:
The carriage and guiding edges are designed as removable components that can be extracted from the drying chamber for cleaning and maintenance. The carriage can be detached from its rails, and the guiding edges can be removed from the chamber walls, providing excellent accessibility for cleaning operations while maintaining automated loading and unloading functionality during operation.
Solution Approach 2:
The device incorporates smooth, non-porous surfaces and flexible sealing elements that are easy to clean and sterilize. The carriage and guiding edges feature continuous smooth surfaces without crevices where contaminants could accumulate, and sealing films maintain aseptic conditions while allowing complete access to all surfaces for cleaning validation.
3Reliability
If guides and carriage are located inside the drying chamber, then reliability of guiding function is improved, but ease of repair and sterilization accessibility worsens
Solution Approach 1:
The guiding system is segmented into fixed guides mounted on the chamber wall and a movable carriage that travels along these guides. This segmentation allows the fixed guides to provide reliable guiding accuracy during operation, while the movable carriage can be easily removed and serviced separately, maintaining both reliability and ease of repair.
Solution Approach 2:
The carriage acts as an intermediary between the fixed guiding edges and the drying vessels. It provides the necessary guiding function during operation while serving as a removable interface that simplifies access to the guiding system for maintenance and sterilization, as the carriage can be detached to expose the underlying guide structure.
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, aseptic, and automated loading and unloading of freeze-dried products with reduced maintenance and disruption, improving vessel stability and cycle times while allowing for modular upgrading of existing systems.
Implementation Method 1
The drive which is allocated to the carriage(s) is formed as a linear motor whose primary part is structurally integrated into the guide of the carriage
Implementation Method 2
the product to be dried is initially frozen, crystallized ice is sublimated from the product under vacuum
Data Source
AI summary
A device for loading and unloading the utility surface (3′) of a drying chamber (2) of a freeze drying system. The device includes a carriage (8) which forms a movable guiding edge for the drying vessels (5), and is moveable on guides (7) disposed on both sides of the utility surface (3) and which extend in parallel with the movement direction and form fixed guiding edges for the drying vessels (5). At least one linear motor is provided to produce a drive for the carriage. All of the components of the device can be located inside the drying chamber (1), and the device of the present invention is suitable for upgrading existing freeze drying systems.