Crane Hoisting Cable Reeving Apparatus for Flexible Strand Mode Switching
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Solution Overview
Problem
Existing reeving apparatuses for cranes are limited in their ability to flexibly change the number of strands with minimal force and effort, often requiring complex maneuvers or only allowing coarse selection between operating modes, such as one-strand or two-strand, without efficient transitions to three-strand modes.
Innovation Solution
A method and apparatus that allows for flexible reeving between one-strand, two-strand, and three-strand operating modes by using an auxiliary cable and chain to adjust the load block's position, reducing the force required and enabling smooth transitions by guiding the hoisting cable over pulleys and securing it with wedge sockets and links, allowing for efficient vertical movement and load management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the number of strands is increased to reduce the force required for lifting, then the working speeds are reduced
Solution Approach 1:
The patent implements dynamic reeving capability that allows the crane to switch between one-strand, two-strand, and three-strand operating modes during operation. This enables the system to adapt the number of strands dynamically based on the specific lifting task requirements, optimizing both force and speed for different operational scenarios rather than being fixed in a single configuration
2Adaptability or versatility
If existing reeving apparatuses are used to change the number of strands, then the selection between operating modes is limited, but the flexibility to transition between various strand modes is reduced
Solution Approach 1:
The patent introduces an auxiliary cable as an intermediary element to facilitate the reeving process. This auxiliary cable enables the lower block to be lowered and raised during strand mode changes, allowing the hoisting cable to be rerouted through different pulleys to achieve one-strand, two-strand, or three-strand configurations without requiring complex manual manipulation or disassembly of the entire pulley tackle
Solution Approach 2:
The reeving process is segmented into distinct, manageable steps: guiding the auxiliary cable through specific pulleys, lowering the lower block to desired positions, rerouting the hoisting cable, and securing connections at intermediate stages. This segmentation transforms a complex reeving operation into a series of simple, sequential actions that can be performed easily by operators
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient and flexible switching between different strand modes with reduced operational force, enhancing the crane's versatility and operational range by minimizing the effort needed to change the number of strands, thus optimizing load handling and movement.
Implementation Method 1
wherein the weight of the lower block causes the end of the hoisting cable which is connected to the auxiliary cable to be pulled around the lower block cable pulley and approach the jib as the lower block is let down further
Implementation Method 2
guidance of an end of an auxiliary cable, which is connected or can be connected by its other end to the end of the hoisting cable, over the lower block cable pulley, guidance of the one end of the auxiliary cable over a second jib cable pulley on the jib
Data Source
AI summary
The invention relates to a method and to an apparatus for reeving a hoisting cable of a crane, wherein the load to be transported can be suspended from a lower hook block (3), which is held by the hoisting cable (12), from single-loom to double-loom and from double-loom to triple-loom mode, in which an auxiliary cable and/or a chain are utilized such that the weight of the lower hook block causes the hoisting cable to be pulled around the respective roller.