Slewing Frame Assembly with Self-Aligning Guide Pins
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Solution Overview
Problem
Existing techniques for assembling the slewing frame of a work machine, such as a mobile crane, require a significant amount of labor and time due to misalignment of pin holes, necessitating strong pushing and rotation of heavy components.
Innovation Solution
The slewing frame is designed with a front frame and a rear frame that are separable, featuring positioning pins, pin holes, and rotation preventing portions to facilitate easy alignment and connection, reducing the need for manual alignment and insertion of connecting pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rear frame is connected to the front frame using positioning pins and pin holes, then the structural integrity is improved, but the alignment precision deteriorates due to misalignment of pin holes requiring strong pushing and rotation
Solution Approach 1:
The patent applies preliminary action by providing guide faces on the positioning pins that engage with corresponding guide surfaces on the rear frame before the pin holes align. This preliminary engagement guides the rear frame into correct alignment during the connection process, eliminating the need for strong pushing and rotation operations while maintaining structural integrity.
2Ease of operation
If the slewing frame is separated into front frame and rear frame for transportation, then the ease of operation is improved, but the time required for assembly increases due to complex alignment and connection operations
Solution Approach 1:
The guide faces and guide surfaces are pre-formed on the positioning pins and rear frame respectively, creating a self-aligning mechanism that reduces assembly time when the frames are connected after transportation.
Solution Approach 2:
The guide faces and guide surfaces act as intermediary elements between the positioning pins and pin holes, facilitating smooth alignment and connection of the front and rear frames without requiring complex manual operations.
3Ease of operation
If the connecting pin is inserted while pin holes are misaligned, then the ease of operation is improved by avoiding complex alignment, but the manufacturing precision deteriorates due to improper positioning
Solution Approach 1:
The guide faces on the positioning pins perform the alignment function before the connecting pins are inserted. This preliminary guidance ensures that the pin holes are properly aligned and positioned before insertion occurs, maintaining positioning accuracy while simplifying the insertion operation.
Solution Approach 2:
The guide faces and guide surfaces serve as intermediary alignment mechanisms that enable easy insertion of connecting pins while ensuring accurate positioning of the rear frame relative to the front frame.
Data Source
AI summary
A slewing frame of a work machine and a method of assembling a slewing frame of a work machine where the slewing frame is separable into at least two front and rear members, and an operation of connecting these two members can be easily performed. A slewing frame is separable into a front frame and a rear frame. When a pin fitting portion of a rear frame is fitted on a positioning pin of a front frame, and the rear frame is rotated downward, at a position where a front pin hole and a rear pin hole are aligned with each other, a contact portion of the rear connecting portion is brought into contact with a rotation preventing portion. As a result, a connecting pin can be easily inserted into the front pin hole and the rear pin hole.