Mobile Crane Step Pin Axial Play Adjustment
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Solution Overview
Problem
The installation and dismantling of a mobile crane boom is complicated due to the limited axial play between the superstructure and the boom, which can lead to jamming and increased effort, as existing designs prioritize reduced play to minimize relative movement but struggle to balance this with ease of handling.
Innovation Solution
The use of step pins with a shoulder feature, providing increased axial play for easier installation and dismantling, and additional guide rods and locking means to manage axial forces and prevent jamming, while maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the clear width between side parts is coordinated with the width of the connection part to minimize axial play, then structural stability is improved, but the ease of installation and dismantling deteriorates
Solution Approach 1:
The pin connection system transitions from a static fixed-play design to a dynamic adjustable-play design. The play adjustment device enables the axial play to be dynamically modified between a first state (larger play for installation) and a second state (smaller play for operation), allowing the system to adapt to different operational requirements and resolve the contradiction between stability and ease of installation.
Solution Approach 2:
The axial play parameter is made variable through the play adjustment device. By changing the play parameter between two distinct states (first play state with larger clearance, second play state with smaller clearance), the system can optimize for either installation ease or structural stability depending on the operational phase, thus resolving the technical contradiction.
2Reliability
If the clear width between side parts is reduced to minimize axial play, then relative movement between boom and superstructure is reduced, but the complexity of installation procedure increases
Solution Approach 1:
The system employs a dynamic play adjustment mechanism that allows the installation procedure to be simplified by temporarily increasing axial play, while maintaining reliable relative movement control during operation through reduction of play. This dynamic adaptation reduces the overall complexity of the installation process without compromising operational reliability.
3Ease of operation
If larger axial play is provided for easier boom installation, then handling during installation is simplified, but structural precision deteriorates
Solution Approach 1:
The axial play parameter is dynamically changed between two states: a first state with larger play that facilitates easier boom installation and handling, and a second state with smaller play that ensures structural precision during operation. The play adjustment device enables this parameter transition, allowing the system to achieve both ease of installation and manufacturing precision at different times.
Data Source
AI summary
The disclosure relates to a mobile crane comprising a superstructure having at least one bearing point for pinning on a boom, wherein the bearing point comprises two spaced apart side parts that each have a bore for receiving the pin; and wherein the boom comprises at least one connection part that is provided with a bore and that can be introduced between the side parts such that a common connection pin can be pushed through the bores of the side parts and the connection part, wherein the clear width between the side parts is larger than the width of the connection part of the boom, and wherein a step pin is provided as a connection pin and its formed shoulder forms an abutment for the connection part of the pinned boom in the pinned position.