Telescopic Crane Jib Rigidity via Segmented Part-Jibs
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Solution Overview
Problem
Conventional mobile telescopic cranes with anchoring supports require separate transportation and laborious assembly, increasing costs and time due to the additional weight of anchoring supports, which limits their ability to absorb lateral loads effectively.
Innovation Solution
A mobile telescopic crane design featuring a telescopic jib constructed from multiple part-jibs, each composed of telescopic portions connected by flexurally rigid elements, allowing for mechanical locking and increased area moment of inertia, thereby enhancing rigidity and bearing load capacity without the need for separate transportation and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If anchoring supports are added to increase bearing load capacity, then the crane can better absorb lateral loads, but the additional weight requires separate transportation and assembly
Solution Approach 1:
The jib is divided into multiple part-jibs (at least three) that can be independently telescoped and locked. Each part-jib is constructed from multiple part-jib portions that telescope relative to each other, allowing the jib to be compacted for transportation and extended for operation, eliminating the need for separate anchoring supports
Solution Approach 2:
The patent transitions from a simple longitudinal telescopic jib to a three-dimensional structure where part-jibs are arranged at spacing transverse to the longitudinal direction. This spatial arrangement increases the area moment of inertia and bearing load capacity without requiring additional anchoring supports, as the load-bearing capability is enhanced through the jib's own geometric configuration
2Strength
If the jib is made more rigid to increase bearing load, then lateral loads are better absorbed, but the weight increases requiring separate transportation
Solution Approach 1:
By arranging part-jibs at spacing transverse to the longitudinal direction and connecting them with flexurally rigid connecting elements, the patent creates a three-dimensional load-bearing structure. This spatial configuration dramatically increases the area moment of inertia and rigidity without proportionally increasing weight, as the load-bearing capability is enhanced through geometric arrangement rather than simply adding more material
Solution Approach 2:
The patent employs flexurally rigid connecting elements that mechanically lock adjacent part-jibs, creating a composite structural system. These connecting elements (which may be actuated hydraulically, pneumatically, or electromechanically, or use bayonet-like mechanisms) create a locked, rigid assembly that achieves high bearing load capacity with minimal additional weight compared to solid monolithic construction
3Strength
If anchoring supports are used to absorb lateral loads, then bearing load capacity increases, but costs and assembly time increase substantially
Solution Approach 1:
The patent merges the functions of the jib structure and load-bearing capacity into a single integrated system. The part-jibs with flexurally rigid connecting elements perform both the primary structural function and the lateral load absorption that would otherwise require separate anchoring supports. This eliminates the need for separate transportation and assembly of anchoring components, reducing both time and cost
Solution Approach 2:
The telescopic part-jib portions can be independently adjusted and locked, allowing for rapid deployment and configuration. The mechanical locking mechanisms enable quick assembly and disassembly of the part-jib portions without requiring complex anchoring support installations, significantly reducing assembly time at construction sites
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 a significant increase in bearing load with reduced additional weight, allowing the crane to travel with the complete jib to the construction site, eliminating the need for separate transportation and assembly, while maintaining high rigidity and flexibility in handling various loads.
Implementation Method 1
part-jib portions arranged at a spacing from one another transverse to the longitudinal direction each form a jib portion with at least one flexurally rigid connecting element
Implementation Method 2
the area moment of inertia of the jib is significantly increased. The area moment of inertia, which is a measure of the flexural rigidity, is produced according to the parallel axes theorem from the part-jibs' own proportions and their Steiner proportions
Implementation Method 3
respective adjacent jib portions are mechanically lockable with respect to one another in the longitudinal direction. The locking takes place, for example, by means of locking bolts, which can be actuated hydraulically, pneumatically or electromechanically. Alternatively, the locking can take place by means of a bayonet-like locking mechanism
Implementation Method 4
each of the part-jibs is constructed from at least two part-jib portions so as to be telescopic in the longitudinal direction, wherein part-jib portions arranged at a spacing from one another transverse to the longitudinal direction each form a jib portion
Data Source
AI summary
A mobile telescopic crane has a telescopic jib with at least three part-jibs. Each of the part-jibs is constructed from at least two part-jib portions so as to be telescopic in a longitudinal direction. Part-jib portions arranged at a spacing from one another transverse to the longitudinal direction each form a jib portion with at least one flexurally rigid connecting element. Respective adjacent jib portions are mechanically lockable with respect to one another in the longitudinal direction. A construction of this type of the jib means that an increase in the bearing load is easily achieved by increasing the area moment of inertia of the jib.