Multi-Pulley Boom Telescoping for Higher Crane Hoisting Capacity
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Solution Overview
Problem
Five-boom cranes suffer from high costs, low telescoping efficiency, and limited hoisting capacity due to the use of double-cylinder rope type telescopic mechanisms, where the forces borne by the extension ropes are uneven, leading to severe limitations in hoisting capacity.
Innovation Solution
A multi-pulley telescopic mechanism with a single telescopic mechanism that synchronizes the extension and retraction of multiple booms using a series of pulley systems and ropes, reducing the forces borne by individual ropes and improving hoisting capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a double-cylinder rope type telescopic mechanism is adopted, then the telescoping function is achieved, but the weight and cost increase significantly
Solution Approach 1:
The patent combines the functions of two telescopic cylinders into a single telescopic mechanism by using a rope system with pulleys. The first telescopic mechanism controls both the second boom and the third boom through coordinated rope winding and unwinding, eliminating the need for a second telescopic cylinder while maintaining the telescoping function.
Solution Approach 2:
The patent introduces a rope system with multiple pulleys as an intermediary mechanism to transmit and distribute the force from a single telescopic mechanism to multiple booms. The pulleys act as intermediaries that redirect and multiply the mechanical advantage, enabling one actuator to control multiple telescoping segments.
2Ease of operation
If a double-cylinder rope type telescopic mechanism is adopted, then the telescoping function is achieved, but the cost increases significantly
Solution Approach 1:
The patent merges the functionality of two expensive telescopic cylinders into a single, more cost-effective telescopic mechanism combined with a rope and pulley system. This reduction in the number of expensive components directly lowers the overall cost while maintaining the required telescoping capability.
Solution Approach 2:
The patent replaces expensive telescopic cylinders with a simpler rope and pulley system that uses fewer and less expensive components. The rope system, while requiring regular maintenance, provides a more economical solution compared to multiple hydraulic or mechanical telescopic cylinders.
3Weight of moving object
If a single-cylinder rope type telescopic mechanism is adopted, then the weight and cost are reduced, but the hoisting capacity is severely limited
Solution Approach 1:
The patent uses a system of pulleys as intermediaries to multiply the mechanical advantage of the single telescopic mechanism. The pulleys redirect and distribute the force from the single actuator to multiple booms in a way that amplifies the effective hoisting capacity, overcoming the limitation of using only one telescopic mechanism.
Solution Approach 2:
The patent distributes the telescoping force across multiple dimensions by controlling multiple booms (second, third, fourth, and fifth booms) simultaneously through a single telescopic mechanism. This multi-dimensional force distribution increases the overall hoisting capacity while keeping the weight of the telescopic mechanism low.
4Weight of moving object
If a single-cylinder rope type telescopic mechanism is adopted, then the weight and cost are reduced, but the telescoping efficiency is low
Solution Approach 1:
The patent employs pulleys as intermediary mechanisms to efficiently transmit and distribute the force from the single telescopic mechanism to multiple booms. The pulley system minimizes energy loss and maximizes the effectiveness of each unit of force applied, thereby improving telescoping efficiency despite using a lighter, single-cylinder mechanism.
Solution Approach 2:
The patent achieves efficient telescoping by operating multiple booms in parallel through a single actuator. This multi-dimensional operation allows the system to perform multiple telescoping actions simultaneously, increasing overall productivity and efficiency while maintaining low weight.
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
The multi-pulley telescopic mechanism reduces overall weight and cost while enhancing telescoping efficiency and hoisting capacity by evenly distributing forces across the ropes, allowing synchronous extension and retraction of multiple booms.
Implementation Method 1
A multi-pulley telescopic mechanism comprises a telescopic mechanism, a first boom-extension rope, a second boom-extension rope, a third boom-extension rope... a first boom-extension steering mechanism is mounted at a stationary front end of the telescopic mechanism, one end of the first boom-extension rope is wound around the first boom-extension steering mechanism...
Data Source
AI summary
The invention discloses a multi-pulley telescopic mechanism, and belongs to the technical field of cranes. The multi-pulley telescopic mechanism comprises a telescopic mechanism, a first boom-extension rope, a second boom-extension rope, a third boom-extension rope, a basic boom, and a second boom, a third boom, a fourth boom and a fifth boom which are sequentially inlaid in the basic boom. The invention further discloses a crane, comprising the multi-pulley telescopic mechanism.