Composite Mixing Drum Blade Support for Concrete
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional metal mixing drums for concrete are labor-intensive to produce, prone to wear, heavy, and susceptible to temperature-related concrete setting issues, limiting payload capacity and mixing efficiency.
Innovation Solution
A composite mixing drum made from fiber-reinforced materials with a spiral inner layer and a resin-coated outer layer, featuring projections and ramps for improved mixing and wear resistance, along with compatible drive rings and hatch cover assemblies that reduce weight and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal drums are used for concrete mixing, then structural strength and durability are achieved, but weight increases reducing payload capacity
Solution Approach 1:
The drum is constructed using composite materials consisting of an inner drum layer made from wear-resistant material and an outer drum layer made from fiber-reinforced composite material. This composite structure provides the necessary structural strength while significantly reducing the weight compared to traditional metal drums, thereby increasing payload capacity.
2Strength
If metal drums are used for concrete mixing, then structural integrity is maintained, but wear resistance decreases due to abrasion from concrete
Solution Approach 1:
The inner drum layer is made from wear-resistant material that is resistant to abrasion by concrete, while the outer drum layer provides structural integrity. This composite construction simultaneously achieves both wear resistance and structural integrity, eliminating the need for metal drums that suffer from rapid wear.
Solution Approach 2:
Different regions of the drum have different material properties: the inner layer contacts concrete and is optimized for wear resistance, while the outer layer is optimized for structural strength. This local differentiation of material qualities allows each region to perform its specific function optimally.
3Strength
If metal drums are used for concrete mixing, then structural strength is achieved, but manufacturing labor intensity increases
Solution Approach 1:
The drum is manufactured as a composite structure with the inner and outer layers formed through composite material processes rather than traditional metal forming and assembly operations. This approach reduces manufacturing labor intensity while maintaining structural strength.
4Strength
If metal drums are used for concrete mixing, then structural strength is maintained, but heat retention increases causing concrete setting issues
Solution Approach 1:
The composite material construction of the drum provides thermal insulation properties that reduce heat retention compared to metal drums. The inner and outer layers work together to maintain structural strength while minimizing heat transfer, thereby preventing concrete setting issues.
5Ease of operation
If mixing blades are attached to metal drum shell, then mixing function is provided, but labor and manufacturing costs increase
Solution Approach 1:
The mixing blades are integrated into the inner drum layer as a unified component rather than being separately attached to the drum shell. This merging of the blade and drum structure eliminates additional manufacturing steps and reduces labor costs while maintaining effective mixing functionality.
Data Source
AI summary
A heavy duty rotary concrete mixing drum (16) for coupling to a vehicle (10) having a powered drivetrain (18) for rotating the drum comprises a wall and at least one projection (32). The wall (33) includes an inner surface (34) defining a volume and an outer surface (36). The at least one projection is coupled to the wall and extends from the inner surface of the wall. The projection includes a body and a support member (48) disposed within the body.