Interchangeable Crushing Blade Arrangement for Drum Serviceability
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Solution Overview
Problem
Existing crushing blade arrangements on crushing drums, such as those in bucket crushers, are not serviceable, requiring the entire drum to be replaced when blade parts wear out, rather than allowing for refurbishment of individual components.
Innovation Solution
A quadrangular opening on the blade holder with inward locking protrusions and a corresponding quadrangular shaft portion with longitudinal locking channels allows for the interchangeable and secure attachment of blade pieces, enabling easy servicing without replacing the entire drum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If blade elements are welded to the axis along the entire length, then the blade elements are securely fixed to the crushing drum, but the entire drum must be replaced when blade parts wear, reducing serviceability
Solution Approach 1:
The blade element is divided into separate replaceable components: a shaft portion with locking channels and blade pieces with corresponding locking protrusions. This segmentation allows individual blade pieces to be replaced without replacing the entire drum, resolving the contradiction between secure fixation and ease of repair.
Solution Approach 2:
The locking mechanism allows blade pieces to be dynamically installed and removed from the shaft portion. The form-fitting locking protrusions engage with locking channels to provide secure fixation during operation, while allowing easy replacement when wear occurs, thus achieving both strength and serviceability.
2Reliability
If the entire drum is replaced when blade parts wear, then reliable crushing function is maintained, but waste increases and maintenance costs rise
Solution Approach 1:
By segmenting the blade element into a reusable shaft portion and replaceable blade pieces, only the worn blade pieces need replacement. This maintains reliable crushing function while preventing waste of the drum and shaft components, directly addressing the contradiction between reliability and substance loss.
Solution Approach 2:
The blade pieces are designed as consumable components that can be discarded when worn, while the shaft portion and drum are recovered and reused. This principle eliminates waste of durable components while maintaining reliable operation through replacement of only the worn parts.
3Device complexity
If blade elements are fixedly attached to the axis, then structural simplicity is maintained, but interchangeability of blade pieces is prevented
Solution Approach 1:
The blade element is segmented into a shaft portion and blade pieces with locking mechanisms. This segmentation enables interchangeability of blade pieces while maintaining relatively simple structural design through form-fitting locks, resolving the contradiction between structural simplicity and adaptability.
Solution Approach 2:
The locking mechanism provides a dynamic attachment system where blade pieces can be easily installed and removed from the shaft portion. The form-fitting locking protrusions and channels create a simple yet effective connection that allows interchangeability without complex fastening systems.
Data Source
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AI summary
The invention relates to a crushing blade arrangement of a crushing drum, in which on the outer surface of the crushing drum are arranged a plurality of crushing blades. The arrangement includes, fixedly attached on the outer surface of the drum, a blade holder (1) with a receiving space (3) for an interchangeable blade piece (11). The blade piece (11) is composed of a horizontal blade portion (13) and a vertical shaft portion (12), which shaft portion (12) is adapted to be placed into the receiving space (3) of the blade holder and to be locked into it by means of a separate locking element. The receiving space (3) is shaped as an opening, which has on at least one side a locking protrusion (5) extending inwards to the opening. The shaft portion (12) of the blade piece (11) is shaped as substantially correspond¬ ing to the opening of the blade holder and equipped with a locking channel (15) corresponding to said at least one locking protrusion (5) and extending towards the interior space of the shaft, which locking protrusion (5) and locking channel (15) together form a form locking.