Extensible Boom Crane Power Source Decoupling
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Solution Overview
Problem
Existing telescopic cranes face challenges in increasing load capacity and reach while minimizing the weight and size of the boom, as well as manufacturing and transporting very long cylinders, which are heavy, expensive, and difficult to handle.
Innovation Solution
The system and method involve designing an extensible boom crane where the extensible power source is not anchored to the second section, allowing for rerouting of ropes via sheaves anchored to the base section and the barrel of the extensible power source, resulting in a shorter stroke hydraulic cylinder with a higher load capacity that is decoupled from the second section of the boom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If larger cables and sheaves are used to accommodate larger loads and increased reach, then load capacity and reach are improved, but boom cross section and wall thickness must increase which increases the overall weight of the boom
Solution Approach 1:
A cable redirecting mechanism with sheaves is introduced as an intermediary component. The sheaves redirect the cables at an angle, creating a mechanical advantage that reduces the tensile load on the cables while maintaining the same lifting capacity. This allows the use of lighter cables and reduces boom weight requirements.
Solution Approach 2:
The cable routing geometry is changed by introducing angled redirection through sheaves. This parameter change in cable orientation transforms the force distribution, reducing the tensile stress on individual cable sections and allowing for lighter cable and boom construction.
2Length of moving object
If very long cylinders are used to achieve greater extension, then reach is improved, but manufacturing and transportation become difficult and expensive
Solution Approach 1:
The extension mechanism is segmented into multiple components: a shorter cylinder and a separate cable redirecting mechanism. This segmentation allows the cylinder to be manufactured and transported more easily, while the cable system provides the additional extension function.
Solution Approach 2:
The cable redirecting mechanism acts as an intermediary that extends the functional reach of the system without requiring a proportionally longer cylinder. The sheaves and cables mediate between the cylinder's limited stroke and the boom's extended position.
3Length of moving object
If very long cylinders are used to achieve greater extension, then reach is improved, but the cost and difficulty of transportation increase
Solution Approach 1:
The system is divided into a shorter, more manageable cylinder and a cable-based extension mechanism. This segmentation reduces the cylinder's weight and dimensions for easier transportation while achieving the same functional extension through the combined system.
Solution Approach 2:
The direct mechanical connection of a long cylinder is replaced with a cable-based mechanical system involving sheaves and pulleys. This substitution achieves the extension function with lighter, more transportable components.
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
This approach allows for a crane with increased load capacity and reduced weight, enabling more efficient and stable operation, particularly in lifting heavy loads, while also simplifying the manufacturing and transportation of the crane by reducing the length of the hydraulic cylinder needed.
Implementation Method 1
a hydraulic cylinder that allows it to change length
Implementation Method 2
Wire ropes transfer the translational force of the telescoping cylinder
Data Source
AI summary
A system for design of a synchronous rope extended telescoping boom, the system including a base section, a rope extended tip section, and at least one rope extended boom section disposed between the base section and the tip section, each section having an open interior space. An extensible power source disposed within the open interior space of the base section for translating the rope extended boom sections, the power source comprising an extensible first end and an unanchored body portion, wherein the extensible first end is anchored to the base section proximate a trailing edge of the first section.