Retractable Upper Spreader Guide for Crane Transport Height Limits
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Solution Overview
Problem
Existing cranes face challenges in reducing the protrusion length of guide parts from the boom, which becomes difficult for a small number of workers to manage as the crane size increases, especially when the boom length and connection unit length increase, leading to fluctuations in the position of the upper spreader and requiring heavier guide parts.
Innovation Solution
An upper spreader guide device with a pair of left and right boom-side guide parts and movable guide parts that can change positions between protruding and retraction positions, allowing the guide parts to be adjusted to fit within transportation height limits while facilitating attachment of the upper spreader to the boom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the boom length is increased to accommodate larger crane size, then the lifting capability is improved, but the fluctuation range of the upper spreader position increases and the guide part length must be increased
Solution Approach 1:
The guide part is divided into a fixed part attached to the boom and a movable part that can change length. The movable part includes a guide rod that can extend and retract, allowing the guide part length to be dynamically adjusted based on the upper spreader's position requirements, thereby resolving the contradiction between maintaining guide functionality and reducing protrusion length for transportation.
Solution Approach 2:
The guide part is segmented into multiple components: a fixed part, a movable part, and a guide rod. This segmentation allows the guide part to be reconfigured - during operation, the guide rod extends to provide sufficient guidance length; during transportation, the guide rod retracts to minimize protrusion, thus resolving the length contradiction.
2Stability of the object's composition
If the guide part length is increased to reduce fluctuation range, then the guidance stability is improved, but the guide part weight increases making it difficult for a small number of people to perform work
Solution Approach 1:
The guide part employs a dynamic length adjustment mechanism where the movable part can extend to provide stable guidance during operation and retract to reduce weight for easier handling during transportation and assembly, thus resolving the contradiction between stability and weight.
Solution Approach 2:
The movable guide part is designed to be easily adjustable by a small number of people through simple extension and retraction mechanisms, eliminating the need for heavy-duty components while maintaining operational stability through proper mechanical design of the movable assembly.
3Adaptability or versatility
If the protrusion length of guide parts is reduced for transportation, then the transportation compliance is improved, but the attachment work becomes more difficult
Solution Approach 1:
The guide part's movable component can be extended during attachment work to provide sufficient working length and guidance, then retracted for compact transportation. This dynamic adjustment ensures both easy attachment operation and transportation compliance without compromise.
Solution Approach 2:
By segmenting the guide part into fixed and movable sections, the design allows the movable section to be positioned optimally during attachment work for ease of operation, then retracted to minimize overall protrusion for transportation compliance.
Data Source
AI summary
An upper spreader guide device includes a pair of left and right boom-side guide parts each supported by a boom so as to be arranged in a raised attitude of rising diagonally upward from the boom in a state where the boom is arranged in a lowered attitude, and a pair of left and right movable guide parts supported by the pair of boom-side guide parts, respectively, such that a relative position with respect to the pair of boom-side guide parts is changeable between a protruding position and a retraction position.