Derricking Apparatus Mast Lowering for Spreader Attachment
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Solution Overview
Problem
The existing derricking apparatus for cranes requires manual position adjustment of the lower spreader, which is time-consuming and labor-intensive when attaching it to the crane main body during assembly or disassembly.
Innovation Solution
A derricking apparatus with a mast, lower spreader retainer, and connector that allows the lower spreader to be automatically positioned for attachment by lowering the mast to lie over the crane main body, eliminating the need for manual adjustment of the spreader retainer pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual position adjustment of the lower spreader is performed by hands, then the lower spreader can be attached to the crane main body, but it takes time and effort
Solution Approach 1:
The lower spreader automatically positions itself relative to the crane main body through the mast's lowering action. The connector mechanism enables the lower spreader to self-align with the retainer without requiring manual position adjustment by operators, thus achieving self-service attachment
Solution Approach 2:
The mast is lowered in advance to position the lower spreader at the correct location before attachment occurs. This preliminary positioning action eliminates the need for subsequent manual adjustment, as the lower spreader is already in the proper position to engage with the retainer
2Ease of operation
If manual position adjustment of the lower spreader is performed by hands, then the lower spreader can be attached to the crane main body, but it requires operator effort
Solution Approach 1:
The attachment system uses the mast's own motion to position the lower spreader, eliminating the need for separate manual adjustment mechanisms. The connector leverages the existing mast-lowering action to achieve alignment, avoiding additional complex adjustment devices
Solution Approach 2:
The mast serves multiple functions: it supports the boom, enables lifting operations, and simultaneously positions the lower spreader for attachment. By making the mast multi-functional, the invention avoids adding separate positioning mechanisms, thus reducing overall device complexity
Data Source
AI summary
It is aimed to enable an easier attachment of a lower spreader to a machine main body. The mast 30 is tiltably attached to the machine main body 13, and operable to lie over the machine main body 13. The lower spreader retainer 40 is fixedly attached to the machine main body 13, and adapted for retaining the lower spreader 50. The connector 60 connects the mast 30 and the lower spreader 50 with each other so that the mast 30 holds the lower spreader 50. The lower spreader 50 and the lower spreader retainer 40 are arranged at a position that allows the lower spreader retainer 40 to retain the lower spreader 50 in a state where the mast 30 holding the lower spreader 50 is lowered.