Bracket for Pivot Rod in Doctor Arrangement
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Solution Overview
Problem
Existing brackets for pivot rods in doctor arrangements for fiber web machines are prone to breaking due to stress concentration at the corners, lack of support for loading tubes, and inadequate load distribution, leading to instability and reduced service life.
Innovation Solution
The development of a novel bracket for pivot rods, manufactured through casting or 3D printing, which features a thickened base and ears with strategically designed openings, providing increased rigidity and load capacity while contouring to the shape of loading tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If brackets are manufactured from thin sheet metal with bent corners, then manufacturing is simple and cost-effective, but structural integrity deteriorates due to stress concentration at corners leading to breaking
Solution Approach 1:
The bracket design changes the geometric parameters by thickening the base and ear sections, and rounding the corners to eliminate stress concentration points. This parameter modification maintains manufacturing feasibility while dramatically improving structural integrity and resistance to breaking.
Solution Approach 2:
The bracket features localized thickening at critical areas (base and ears) while maintaining thinner sections elsewhere. This local quality enhancement provides additional strength where stress concentration occurs without significantly increasing overall material usage or manufacturing complexity.
2Device complexity
If brackets have minimal support structure, then device complexity is reduced, but loading tubes lack adequate support causing reduced travel and potential damage
Solution Approach 1:
The bracket incorporates localized support features in the form of contoured surfaces and recesses at specific locations where loading tubes contact the bracket. These local modifications provide necessary support and guidance for loading tubes without adding complex structural elements throughout the entire bracket.
Solution Approach 2:
The bracket acts as an intermediary structure that mediates between the mounting system and loading tubes. By incorporating contoured surfaces and recesses, it provides a protective interface that supports loading tubes, prevents damage, and maintains proper travel while keeping the overall device simple.
3Ease of operation
If single mounting bolt is used per bracket, then installation is quick and simple, but load distribution is inadequate causing top plate and pivot rod bending
Solution Approach 1:
The bracket design incorporates multiple mounting apertures that allow distribution of mounting points across different locations. This segmentation of the mounting function enables better load distribution across the bracket structure and to the attached components, preventing bending while maintaining simple installation procedures.
Solution Approach 2:
The bracket extends in multiple dimensions with strategically positioned mounting apertures at different locations and orientations. This multi-dimensional arrangement of mounting points creates a more robust load distribution system that prevents bending of connected components while keeping the bracket itself simple in design.
Data Source
AI summary
The invention relates to a bracket for a pivot rod in a doctor arrangement. The bracket has a base with a mounting aperture and adjacent ears with a hole for a pivot rod arranged perpendicular to the base. The bracket is a cast or 3D-printed piece. The invention also relates a doctor arrangement for a fiber web machine.