Raisable-lowerable member axis alignment mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing raisable-lowerable members in construction machines require significant time and effort to attach the second link to the boom, as it necessitates positional alignment using an auxiliary crane, which is inefficient.
Innovation Solution
A raisable-lowerable member design that includes a position adjusting and holding unit to adjust and secure the relative position of the second link with respect to the frame, allowing it to be easily aligned with the rotational axis of the jib foot, eliminating the need for auxiliary cranes during attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the second link is attached to the boom by positioning its distal end using an auxiliary crane, then the rotational axis alignment is achieved, but the attaching operation takes a lot of time and effort
Solution Approach 1:
The patent applies preliminary action by providing a position adjusting and holding unit that pre-positions the second link relative to the frame before attachment to the boom. This unit includes a position adjusting mechanism that can adjust the position of the second link in the rotational direction, allowing the rotational axis of the second link to be aligned with the rotational axis of the jib foot in advance. This preliminary positioning eliminates the need for time-consuming auxiliary crane operations during the actual attachment process.
Solution Approach 2:
The position adjusting and holding unit serves as an intermediary mechanism between the second link and the boom. It includes a position adjusting mechanism with a screw mechanism that can precisely control and hold the position of the second link, facilitating easy alignment with the rotational axis without requiring external auxiliary equipment like cranes.
2Reliability
If the second link is attached to the boom requiring positional alignment, then the structural integrity is ensured, but the operation becomes complex and time-consuming
Solution Approach 1:
The position adjusting and holding unit acts as an intermediary that simplifies the attachment operation while ensuring structural integrity. It includes a position adjusting mechanism with a screw mechanism that provides precise control over the second link's position, making the alignment process straightforward and reducing operational complexity.
Solution Approach 2:
The position adjusting and holding unit enables self-service by allowing operators to easily adjust and hold the position of the second link without requiring complex external equipment. The screw mechanism provides intuitive manual adjustment capability, and the holding mechanism maintains the adjusted position, making the entire process self-contained and simple to perform.
Data Source
AI summary
Disclosed is a raisable-lowerable member which comprises a boom and a jib. The boom comprises a first supporting portion configured to rotatably support a jib foot when the jib is set in a protruding posture; and a second supporting portion configured to rotatably support a supportable portion of the jib when the jib is set in an enfolded posture. A position adjusting and holding unit of the jib is configured to couple, to the frame, a specific site of the second link in such a manner that a relative position of the second link with respect to the frame in a rotational direction of the second link is adjustably changed to allow the rotational axis of the second joint portion to become coincident with the rotational axis of the jib foot, and to hold the second link at the changed relative position.