Crusher Cutter Shaft Segmentation for Rapid Cam Replacement
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Solution Overview
Problem
Existing shredders with rotating cutter shafts face challenges in quickly and efficiently repairing worn-out cams, as current methods such as welding or replacing entire shafts are laborious and time-consuming, and screw connections can be prone to distortion and corrosion.
Innovation Solution
The shredder design incorporates a parting line between the center piece with cams and the end piece, allowing for easy separation and replacement of the entire knife shaft, utilizing a tongue-and-groove or notch-and-rib mechanism for quick disassembly and reassembly, with a locking screw for secure connection, enabling efficient torque transmission and easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding is used to repair worn cams on the built-in cutter shaft, then the cam wear can be compensated, but the repair process is laborious and expensive due to cramped spatial conditions and long working time
Solution Approach 1:
The cutter shaft is divided into modular components: a center piece containing the cams and two end pieces with bearing supports. This segmentation allows the center piece to be removed and replaced independently without welding operations in cramped spaces, significantly reducing repair time while maintaining cam reliability through replaceable components.
Solution Approach 2:
The center piece with cams is extracted as a separate replaceable module from the cutter shaft assembly. This extraction eliminates the need for in-situ welding repairs and allows rapid replacement of worn cams by simply removing and reinstalling the center piece, directly addressing both the reliability and time loss issues.
2Reliability
If the entire cutter shaft is replaced by dismantling and removing the worn shaft, then worn cams can be renewed, but the process takes longer than welding due to removal and reinstallation time
Solution Approach 1:
The cutter shaft is segmented into a center piece and two end pieces that remain in the container. Only the center piece needs to be removed and replaced, reducing the replacement scope from the entire shaft to just one module, thereby minimizing downtime while ensuring cam renewal.
Solution Approach 2:
The center piece is extracted as a standalone replaceable unit. This extraction strategy allows rapid replacement without the need to remove and reinstall the entire cutter shaft or its bearing supports, directly reducing replacement time while achieving cam renewal.
3Ease of repair
If screw connection is used to attach cams to the knife shaft, then worn cams can be unscrewed and replaced within reasonable time, but the screw connection can be distorted or bent during operation and requires lengthy preliminary work to loosen
Solution Approach 1:
The cutter shaft is segmented into a replaceable center piece and stationary end pieces. This segmentation eliminates the need for screw connections entirely, as the center piece is removed and installed as a complete module, avoiding both distortion issues and lengthy loosening operations while maintaining ease of repair.
Solution Approach 2:
The center piece is extracted as a complete module with cams already attached. This extraction approach bypasses the screw connection problem entirely by making the center piece itself replaceable, ensuring both ease of repair and operational reliability without compromised fastening mechanisms.
4Loss of time
If a parting line with tongue-and-groove mechanism is used to separate the center piece from end pieces, then the knife shaft can be quickly disassembled and reassembled, but additional components and structural complexity are introduced
Solution Approach 1:
The cutter shaft is segmented into modular components connected by simple tongue-and-groove joints. This segmentation enables quick disassembly and reassembly by allowing the center piece to be easily separated and reattached, reducing downtime while the simple joint design minimizes added structural complexity.
Solution Approach 2:
The center piece is designed for easy extraction using a parting line with tongue-and-groove features. This extraction mechanism achieves rapid disassembly and reassembly through simple geometric interlocking rather than complex fastening systems, balancing speed with structural simplicity.
Data Source
AI summary
The disintegrator has blade shafts (3) separable between a middle piece (32) and an end piece (33) by a separation joint (34). The middle piece is equipped with a cam (31). The joint is aligned differing from a longitudinal axis of the shaft. A groove (35) or an indent is formed on a surface of the adjacent middle and end pieces. A spring (36) or a rib of a length is slidable in the grove or the indent, and provided as a part of another surface of the pieces. The middle piece is detached from a container (1) i.e. shovel, in a region of the end piece, which is mounted in the container.