Crane Sheave Pin Removal Assembly Without Rope Unreeving
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Solution Overview
Problem
Conventional overhead cranes require unreeving and re-reeving of wire ropes to change the main support pin in the upper block, which is time-consuming and inconvenient.
Innovation Solution
A pin removal assembly for the upper block of an overhead crane, comprising a sheave support mountable to the frame and a pin support that allows the sheave pin to be removed and replaced without unreeving the wire ropes, using first and second support brackets, a sheave support with wedges, and a pin support with a pulling/pushing mechanism to maintain the sheaves' position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the main support pin is changed by conventional methods, then the pin can be replaced, but the wire rope must be unreeved and re-reeved which is time-consuming
Solution Approach 1:
The upper block is divided into functional components: the frame, the sheaves, and the removable pin assembly. This segmentation allows the pin to be independently removed and replaced without affecting the sheaves or wire ropes, enabling quick pin changes while maintaining the integrity of the rest of the system.
Solution Approach 2:
A pin support device serves as an intermediary component that temporarily holds the sheave pin during removal and installation. This intermediary device facilitates the pin replacement process by providing a controlled mechanism for extracting and reinstalling the pin without requiring wire rope manipulation.
2Ease of operation
If the sheave pin is removed without support structures, then the pin can be extracted, but the sheaves become unsupported and unstable
Solution Approach 1:
The pin support device is prepared and positioned in advance before pin removal begins. This preliminary action ensures that the support structure is ready to immediately承接 the sheaves when the pin is removed, maintaining stability throughout the transition and preventing accidental drops or misalignment.
Solution Approach 2:
The pin support device acts as an intermediary between the removed pin and the sheaves, providing temporary support and alignment. This intermediary structure ensures that the sheaves remain stable and properly positioned during the critical transition period when the pin is being removed or installed.
Data Source
AI summary
A pin removal assembly for use with an upper block of a crane includes a sheave support and a pin support. The upper block includes a frame, a plurality of sheaves, and a removable sheave pin that defines an axis of rotation for the sheaves and supports the sheaves within the frame. The pin removal assembly includes a sheave support mountable to the frame of the upper block and a pin support mountable to the frame of the upper block. The pin support is configured to support the sheave pin when the sheave pin is removed from the upper block.