Telescopic Boom Box-Section Force Dissipation
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Solution Overview
Problem
Conventional telescopic booms for cranes are too heavy due to large dimensions, and existing telescopable lattice booms require high machining accuracy and production costs, making them impractical for large hub heights in wind power applications.
Innovation Solution
A telescopic boom with a box-shaped hollow structure and pinning system that connects adjacent sections through their top chords, using a single pinned joint and force-dissipating lattice bars to distribute forces uniformly, reducing the number of necessary joints and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional telescopic booms are used to achieve large boom lengths for high hub heights, then the required hoisting capacity is met, but the weight becomes excessively high
Solution Approach 1:
The boom is divided into multiple telescoping sections (inner and outer sections) that can be extended and retracted independently. This segmentation allows the boom to achieve large lengths when extended while maintaining a compact, lighter structure when retracted, resolving the contradiction between required boom length and weight.
Solution Approach 2:
The inner telescoping section is nested within the outer telescoping section, allowing compact storage and reduced weight when not in use. The nested configuration enables the boom to achieve extended lengths only when needed, maintaining a space-efficient and weight-optimized design.
2Weight of moving object
If telescopable lattice booms are used to reduce weight, then weight is reduced, but the complexity of securing extended sections increases
Solution Approach 1:
The pinning means are integrated directly into the lattice structure of the telescoping sections, merging the securing function with the structural elements. This integration simplifies the overall design by eliminating separate securing mechanisms while maintaining the necessary connection strength between extended sections.
Solution Approach 2:
The pinning means are designed to automatically engage and secure the telescoping sections when extended, reducing the need for complex manual securing operations. The self-securing mechanism simplifies the operation while maintaining structural integrity.
3Strength
If multiple pinned joints are used to connect telescoping sections, then connection strength is sufficient, but production costs and machining accuracy requirements increase rapidly
Solution Approach 1:
The force-dissipating function is extracted from the pinned joints and transferred to the top chords of the telescoping sections. This extraction allows the pinned joints to be simpler in design, reducing machining accuracy requirements and production costs while maintaining sufficient connection strength through the top chord force dissipation.
Solution Approach 2:
The top chords act as intermediary elements that dissipate forces between telescoping sections, reducing the load and complexity requirements on the pinned joints. This intermediary force dissipation mechanism allows simpler, more cost-effective pinned joint designs while maintaining overall connection strength.
Data Source
AI summary
A telescopic boom for a crane has at least two telescopable telescoping sections in the form of lattice pieces, each of which exhibits a hollow structure that has in essence the shape of a box. The bottom chords of adjacent sections have in each instance a pinning structure to provide for pinning to each other during normal crane operations. By way of the design of at least the outer telescoping section, at least some of the force that is introduced into the pinned joint can be dissipated into the top chord of the boom.