Locknut Covering Part for Disc Refiner Oil Leakage
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Solution Overview
Problem
Disc refiners experience oil leakage from the shaft housing due to the notches in the locknut acting as paddles when the rotation shaft and locknut rotate, agitating the oil and causing leakage.
Innovation Solution
An accessory with a covering part that attaches to the locknut, covering at least parts of its outer periphery to prevent the notches from acting as paddles, thereby reducing oil agitation and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the locknut with notches is used for holding bearings in place, then the bearing installation is simplified and secure, but the notches act as paddles during rotation causing oil agitation and leakage
Solution Approach 1:
A cover component is introduced as an intermediary element between the locknut and the oil. The cover attaches to the locknut and blocks the notches, preventing direct contact between the rotating notches and the oil, thereby eliminating the paddle effect while preserving the locknut's bearing-holding function
Solution Approach 2:
The locknut assembly is divided into two functional parts: the locknut itself (for securing bearings) and the cover (for preventing oil leakage). This segmentation allows each component to perform its specific function independently, with the cover addressing the harmful effect without interfering with the locknut's primary purpose
2Ease of operation
If the notches in the locknut are exposed during rotation, then tool access for installation is enabled, but oil agitation and leakage occur during operation
Solution Approach 1:
The cover is designed to be installed after the locknut is in place but before full operation begins. During installation, the notches remain exposed for tool access, but once the cover is attached, the notches are sealed, preventing oil loss during subsequent rotation
Solution Approach 2:
The cover serves as a mediator that allows the system to transition from an open state (during installation) to a sealed state (during operation), enabling easy installation while preventing oil loss
Data Source
AI summary
An accessory is provided for a disc refiner that is for refining lignocellulosic material and includes at least two refiner discs, at least one of which is a rotor refiner disc, a motor, and a rotation shaft assembly that includes (i) a rotation shaft, (ii) a shaft housing, (iii) at least one bearing between the shaft housing and the rotation shaft for allowing rotation of the rotation shaft within the shaft housing, and (iv) at least one ring-shaped locknut that encircles the rotation shaft, is configured for holding the at least one bearing in place on the rotation shaft, and includes notches for a tool to grip when attaching the locknut in the rotation shaft assembly. The accessory is configured to be attached to the locknut and includes at least one covering part configured to at least partly cover the notches of the locknut when attached to the locknut.