Portable Doctor Blade Maintenance Device for Fiber Web Machines
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Solution Overview
Problem
Existing solutions for maintaining doctor blades in fiber web machines are cumbersome, hazardous, and require multiple personnel, as they are large, heavy, and difficult to handle safely during operation, especially when the machine is running.
Innovation Solution
A portable device with a safety cage and extended blade holder allows for safe and single-person operation by maintaining a safe distance from rotating parts, using a portable device with feed rollers to remove and install doctor blades without direct hand contact, and a lifting platform for accessing upper positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional device for pulling out a doctor blade is used, then the doctor blade can be removed from the holder, but the device is big and heavy requiring at least two persons for handling
Solution Approach 1:
The maintenance device is divided into separate functional components: a portable pulling device with feed rollers for removing the doctor blade, and a separate safety cage for containing the blade. This segmentation allows each component to be lighter and easier to handle individually, eliminating the need for multiple persons while maintaining safety and functionality.
2Ease of operation
If the traditional device is positioned close to rotating machine parts for maintenance, then access to the doctor blade holder is achieved, but the operation becomes hazardous with constant threat of injuries
Solution Approach 1:
A safety cage acts as an intermediary structure between the operator and the rotating machine parts. The cage is positioned close to the doctor blade holder for easy access, but the operator remains outside the cage, separated by a protective barrier. This allows maintenance operations to be performed safely without direct exposure to rotating parts.
Solution Approach 2:
The doctor blade is extracted from its holder and placed inside the safety cage during the maintenance process. This removes the sharp, dangerous object from the vicinity of rotating parts, eliminating the constant threat of injuries while the blade is being handled or replaced.
3Object-affected harmful factors
If the fiber web machine is shut down for doctor blade maintenance, then safe maintenance conditions are provided, but the machine runtime is reduced
Solution Approach 1:
The maintenance operations can be performed while the fiber web machine continues to run. The portable pulling device and safety cage enable blade removal and replacement without requiring machine shutdown, allowing continuous production while maintaining safety through the protective cage and controlled maintenance procedure.
Data Source
AI summary
A set for maintenance of a doctor blade (10) positioned within a doctor blade holder (11) in a fiber web machine has a portable device (14) for moving the doctor blade (10) out from the doctor blade holder (11). A prolonged doctor blade holder (11) extends outwardly from the doctor blade holder, and a safety cage (15) is positioned in the area of an end of the doctor blade holder (11). The invention also relates to a doctor arrangement for a fiber web machine.