Excavator Bucket Lip Weight Reduction via Segmented Beam Design
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Solution Overview
Problem
Existing cast lips for excavating machines are excessively heavy, leading to reduced payload capacity and increased manufacturing complexity and cost, due to their massive structure required to withstand high loads and abrasion in digging operations.
Innovation Solution
A dual beam construction with recessed portions is implemented in the lip, reducing weight while maintaining strength and durability, with recesses making up at least 18% of the total lip volume to achieve weight savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a massive cast lip structure is used to withstand high loads and abrasion, then strength and durability are improved, but weight increases significantly
Solution Approach 1:
The lip is divided into multiple segments including a front beam, rear beam, and intermediate portion, allowing each segment to be optimized for its specific function while reducing overall material usage compared to a monolithic structure
Solution Approach 2:
Different portions of the lip have different thicknesses and structural characteristics - the front and rear beams are thicker to handle loading, while the intermediate portion is thinner to reduce weight, creating local quality variations that optimize both strength and weight
2Strength
If a massive cast lip structure is used to withstand high loads and abrasion, then strength and durability are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The lip is designed as separate castable segments (front beam, rear beam, intermediate portion) that can be manufactured independently and then welded together, simplifying the casting process and reducing mold complexity compared to a single massive casting
Solution Approach 2:
Multiple separately cast components are combined through welding to form the complete lip assembly, allowing each component to be optimized for its specific manufacturing requirements while achieving the overall structural performance needed
3Weight of moving object
If lip weight is reduced through recesses, then payload capacity is improved, but strength and durability may be compromised
Solution Approach 1:
The lip is segmented into beams and intermediate portions with recesses strategically placed in non-critical areas, allowing weight reduction while maintaining structural integrity in load-bearing regions
Solution Approach 2:
The recesses create local quality variations where material is removed from the intermediate portion and selected areas of beams, reducing weight while preserving full material presence in areas requiring maximum strength for load bearing
Data Source
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AI summary
A lip for an excavating bucket with a front beam and a rear beam extending along the length of the lip and defining at least one recess between them. The front beam includes noses extending forward of the beam for mounting ground engaging tools. Ribs extend between the front beam and the rear beam. The ribs separate recesses extending between the beams.