Flanged Stud and Rail for Tool-Ready Doctor Blade Installation
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Solution Overview
Problem
Existing doctor blade assemblies in fiber web machines are bulky, prone to cracking, require specialized tools for installation, and have components that are weak and prone to damage, leading to maintenance difficulties and reduced durability.
Innovation Solution
A novel stud and rail structure design for the doctor blade holder, featuring a one-piece flanged stud with a rotating sleeve and a solid metal rail, allowing easy installation and maintenance, improved durability, and reduced stress on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a metal rail structure with fiberglass segments is used, then the assembly can be made compact, but the fiberglass is prone to cracking under impact loads and deteriorates over time
Solution Approach 1:
The patent applies composite materials by combining metal and fiberglass in a specific configuration: the rail structure uses metal for structural integrity and impact resistance, while fiberglass segments are used for non-critical portions. This composite approach maintains compact assembly height while improving overall durability and crack resistance compared to all-metal constructions.
Solution Approach 2:
The patent applies local quality by using different materials in different locations of the rail structure. Critical areas subject to impact loads use metal construction, while less critical areas use fiberglass segments. This localized material selection optimizes both compactness and durability according to actual stress distribution.
2Ease of manufacture
If a multi-part stud requiring special tools is used, then the stud can be installed, but maintenance becomes difficult when the tool is not available
Solution Approach 1:
The patent applies segmentation by dividing the stud into modular components that can be assembled without specialized tools. The stud is segmented into parts that can be manually handled and assembled, allowing maintenance personnel to install and remove the doctor blade holder using basic tools rather than requiring specialized equipment.
Solution Approach 2:
The patent applies self-service by designing the stud assembly to be self-contained and tool-free for maintenance operations. The modular design allows the stud to be assembled and disassembled by hand, enabling maintenance personnel to service the system independently without requiring external specialized tools.
3Ease of operation
If rotating components with sharp corners are used, then the stud can rotate, but the sharp corners cause damage to rotating elements and the components will break off with time
Solution Approach 1:
The patent applies spheroidality by replacing sharp corners with rounded surfaces on the rotating components. The rotating elements feature curved geometries that eliminate sharp edges, preventing damage to rotating parts while maintaining the necessary rotational functionality. This curvature modification significantly improves component durability and prevents breakage over time.
4Ease of manufacture
If the stud has multiple parts, then the stud can be assembled, but the assembly requires specialized tools and is complex
Solution Approach 1:
The patent applies merging by combining multiple stud parts into a single integrated component or by designing the parts to be permanently assembled. This reduction in part count simplifies the overall device complexity while maintaining the necessary assembly capability, eliminating the need for specialized tools and reducing maintenance difficulty.
Data Source
AI summary
A plurality of studs mount a doctor blade holder to a doctor back in a fiber web machine for slidable extraction of the doctor blade holder in the cross machine direction. Each stud (15) has a body (16) with a cylindrical center segment with a protruding nonround flange (17) formed as a single piece with the center segment. Opposed flats of the nonround flange of the body (16) may be engaged by the opposed parallel jaws of a conventional wrench allowing ready attachment of the studs to the doctor blade holder and subsequent installing within the channel of a rail which is mounted to the doctor back. A slide bar may be fixed to the doctor blade holder to extend out of the rail for engagement and extraction of the doctor blade holder.