Crane Pin Connection With Spreadable Crossbar For Clamping
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Solution Overview
Problem
Existing crane designs face challenges in achieving high load-bearing capacity while maintaining ease of assembly and disassembly due to manufacturing tolerances and the limitations of pin connections.
Innovation Solution
A spreadable crossbar mechanism is introduced in the spigot connection, allowing the crossbar to widen and clamp the structural parts together, providing a compressive force that increases the load-bearing capacity of the crane, while allowing for simple assembly and disassembly by spreading the crossbar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pin connections are used to join longitudinal chords, then assembly and disassembly become simple, but manufacturing tolerances limit the load-bearing capacity and stability
Solution Approach 1:
The crossbar is designed to transition from a non-spread state during assembly to a spread state during operation. The spreading device enables the crossbar to dynamically adjust its dimensions, transforming the static pin connection into a dynamic clamping connection that develops full load-bearing capacity only when spread, thus resolving the contradiction between easy assembly and high strength
Solution Approach 2:
The crossbar's dimensional parameters are changed through the spreading mechanism. When spread, the crossbar's cross-sectional dimensions increase, creating a clamping effect that significantly enhances the load-bearing capacity of the connection. This parameter change allows the same component to serve both assembly simplicity and operational strength requirements
2Stability of the object's composition
If excessive press fits are used to increase load-bearing capacity, then stability improves, but assembly and dismantling become difficult
Solution Approach 1:
Instead of using permanent excessive press fits, the invention employs a dynamic spreading mechanism that applies clamping force only when needed. The crossbar can be easily inserted in the non-spread state for simple assembly, then spread to create the stabilizing clamping effect, allowing both easy assembly and high stability to coexist
Solution Approach 2:
The spreading device enables the crossbar to self-adjust and create the necessary clamping force for stability. Once spread, the crossbar maintains the clamping effect on the pin connection without requiring continuous external force, achieving stability through self-service while maintaining ease of assembly
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 spreadable crossbar mechanism enhances the load-bearing capacity of the crane by securely clamping structural sections with a compressive force, accommodating manufacturing tolerances and ensuring stability without compromising assembly ease.
Implementation Method 1
at least one inclined surface, which converts a relative movement of the spreading parts to one another in the longitudinal direction of the crossbar into a spreading movement transverse to the longitudinal direction of the bar
Data Source
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AI summary
The invention relates to a crane, comprising a multi-piece longitudinal structural part, in particular a tower or cantilever, the pieces of which comprise corner posts or longitudinal members that can be detachably connected to each other by means of a pin connection, wherein the pin connection comprises a pin that can be inserted into a pin receptacle, which pin can be fixed by means of at least one transverse bolt that can be inserted transversely to the insertion direction of the pin. According to the invention, the transverse bolt of the pin connection can be spread by means of a spreading device in such a way that pieces of the longitudinal structural part to be connected can be clamped to each other by the spreading of the transverse bolt.