Side Lift Spreader Main Beam Segmented C-Beam Design
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Solution Overview
Problem
Side lift spreaders for intermodal containers face challenges in balancing strength and weight, leading to high production costs and tire wear, while existing designs often require transverse reinforcement bands that can create weaknesses.
Innovation Solution
A side lift spreader design featuring a main beam composed of a steel carrier plate and C-beam with a closed channel configuration, reducing weight and maintaining or increasing strength by eliminating transverse welds and reinforcement bands, and incorporating a telescopic mechanism for accommodating containers of different lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional main beam designs with transverse reinforcement bands and welds are used, then strength is maintained, but weight increases and production costs increase
Solution Approach 1:
The main beam is segmented into a carrier plate and multiple C-beams that are welded to it. This segmentation allows each component to be optimized independently - the carrier plate provides the primary structural framework while the C-beams provide localized reinforcement where needed, eliminating the need for heavy transverse reinforcement bands across the entire beam length.
Solution Approach 2:
Instead of uniformly reinforcing the entire main beam with thick plates and transverse bands, the invention applies reinforcement locally through C-beams positioned at specific locations where structural support is needed. The carrier plate itself uses optimized thickness distribution, being thicker at critical locations and thinner elsewhere, achieving strength requirements with minimum weight.
2Strength
If transverse reinforcement bands and welds are added to the main beam, then strength is maintained, but potential weakness lines are created and manufacturing complexity increases
Solution Approach 1:
The structure is divided into modular components (carrier plate and C-beams) that can be manufactured separately and assembled through welding. This segmentation simplifies manufacturing of each individual component while the overall structure achieves the required strength through the combined configuration of these simpler parts.
Solution Approach 2:
The carrier plate and C-beams are merged into an integrated main beam structure through welding. This combination creates a composite structure that leverages the strengths of both components - the flat carrier plate provides a stable base while the C-beams add dimensional stability and reinforcement, achieving superior strength with simpler individual components.
3Strength
If heavier main beam materials and thicker plates are used, then strength is increased, but production costs increase and tire wear increases
Solution Approach 1:
The carrier plate and C-beams use optimized thickness specifications that provide sufficient strength at critical locations while using thinner material elsewhere. This local quality approach ensures the main beam meets strength requirements without unnecessarily increasing material consumption and production costs across the entire structure.
Solution Approach 2:
The main beam is constructed as a composite structure combining the carrier plate and C-beams in a specific configuration. This composite design achieves superior strength-to-weight ratio compared to using a single solid beam of equivalent weight, reducing both material costs and the operational costs associated with vehicle tire wear.
Data Source
AI summary
A side lift spreader main beam (22) comprises a vertical carrier plate (58) having a first vertical height (H1) and being made of steel plate having a first thickness (T1); a C-beam (60) comprising a first horizontal flange (64) and a second horizontal flange (66) interconnected by a vertical web portion (68), the C-beam (60) having a second vertical height (H2) lower than the first vertical height (H1) and being made of steel plate having a second thickness (T2) thinner than the first thickness (T1), wherein the C-beam (60) defines, together with the carrier plate (58), a closed channel beam with a first flange (74) of the carrier plate (58) extending vertically from the closed channel beam; and an inclined support plate (62) welded to the carrier plate, and to an outer face of the first flange (64) of the C-beam (60) at a distance from the carrier plate (58).