Telescopic Leader Mast Intermediate Segment Rigidity
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Solution Overview
Problem
Existing telescopic leaders for construction vehicles face limitations in usable height due to high weight resulting from open material cross-sections and offset arrangements, which compromise their flexural and torsional rigidity.
Innovation Solution
A telescopic leader design that incorporates an intermediate leader connected to both the inner and outer leaders, allowing moments to be distributed between them, along with a cascading hydraulic cylinder system for even loading, and a leader connection plate for easy coupling to construction vehicles, enhancing flexural and torsional rigidity while maintaining the same weight and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If telescopic leaders use open material cross-sections or offset arrangement of inner and outer leaders, then the structure is simpler and easier to manufacture, but the weight increases and flexural and torsional rigidity decrease
Solution Approach 1:
The leader is divided into multiple segments (inner leader, intermediate leader, outer leader) that can be telescopically extended. This segmentation allows the use of lighter individual sections while maintaining overall structural integrity through the telescopic arrangement, resolving the contradiction between structural simplicity and weight reduction.
Solution Approach 2:
The telescopic leader employs a nested structure where the inner leader is positioned within the intermediate leader, which in turn is positioned within the outer leader. This nesting arrangement reduces the overall footprint and material requirements compared to offset arrangements, achieving weight reduction while maintaining structural simplicity.
2Ease of manufacture
If telescopic leaders use open material cross-sections or offset arrangement, then manufacturing is easier, but the usable height is limited due to reduced rigidity
Solution Approach 1:
By segmenting the leader into telescopic sections, the design achieves high usable height without requiring a single long rigid structure. Each segment can be lighter with simpler cross-sections, yet the assembled telescopic structure provides sufficient rigidity for the extended height, resolving the contradiction between ease of manufacture and usable height.
Solution Approach 2:
The nested telescopic configuration allows multiple leader sections to be compactly stored when retracted, facilitating transport, and extended when needed to achieve greater usable height. The nesting structure inherently provides structural support that maintains rigidity even with simpler cross-sections.
3Length of stationary object
If the leader length is increased to achieve greater depth, then the working capability is improved, but the transportability deteriorates
Solution Approach 1:
The telescopic leader transitions from a static fixed-length structure to a dynamic adjustable-length structure. During operation, the leader can be extended to the required length for deep work; during transport, it retracts to a compact configuration. This dynamic adaptability resolves the contradiction between leader length for working capability and compactness for transportability.
Solution Approach 2:
The nested telescopic structure allows the leader to be compacted into a small package for transport by retracting the inner sections into outer sections. When work requires greater depth, the sections are extended to achieve the necessary length. This nesting mechanism directly enables both long leader length for deep work and compact form for easy transport.
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 design achieves increased flexural and torsional rigidity, allowing for greater usable height and improved load distribution, enabling more efficient operation and transport of construction equipment.
Implementation Method 1
at least one linear drive is arranged, by means of which the outer leader can be displaced in relation to the inner leader. A hydraulic cylinder is advantageously arranged at the end of the inner leader
Data Source
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AI summary
The telescopic leader has an outer leader (2) arranged relative to an inner leader (3) in a longitudinally movable manner. The outer leader and the inner leader exhibit material cross sections. The outer leader encloses the inner leader. A guide is fixedly arranged at an end of the inner leader that is guided into the outer leader. The outer leader is moved on the guide. The outer leader and the inner leader exhibit different material cross sections and/or material strengths in a longitudinal direction. The outer leader and the inner leader are connected with an intermediate leader (4).