Crane Boom Pin Recess Connection Alignment
Solution Overview
Problem
Existing crane boom connection devices are complex and unable to effectively absorb forces, leading to undesirable moments and misalignment issues due to their staggered arrangement.
Innovation Solution
A connecting device featuring a pin and recess system where the pin extends from the end face of a boom part and is secured by a bolt passing through both the pin and recess, allowing for direct force absorption and alignment, with optional securing elements to prevent loosening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a staggered arrangement connection device is used, then the structure can be implemented, but the connection device cannot absorb forces where they are introduced and undesired moments occur
Solution Approach 1:
Instead of offsetting the connection device from the end face as in conventional designs, the invention positions the connection device directly on the end face of the boom part. This inversion of the conventional staggered arrangement allows forces to be absorbed at their introduction point and prevents undesired moments while simplifying the overall structure.
Solution Approach 2:
The invention introduces a pin as an intermediary element that extends from the end face of the boom part into a recess. This pin serves as a mediator that directly transmits forces from the connection point, enabling effective force absorption without the complex staggered arrangement of conventional devices.
2Reliability
If a staggered arrangement connection device is used, then connection can be achieved, but the structure becomes complex
Solution Approach 1:
The connection device is segmented into distinct functional elements: a pin that extends from the end face, a recess that receives the pin, and a fixing element that secures the connection. This segmentation allows each component to perform its specific function efficiently, simplifying the overall structure while maintaining connection reliability.
Solution Approach 2:
The invention inverts the conventional approach by positioning the connection device directly on the end face rather than offset from it. This inversion eliminates the need for complex staggered arrangements while ensuring reliable force transmission and connection stability.
3Ease of operation
If the connection device is offset from the end face, then assembly is possible, but forces cannot be absorbed at the introduction point and moments occur
Solution Approach 1:
The invention inverts the conventional offset arrangement by positioning the connection device directly on the end face of the boom part. The pin extends from the end face into a recess, allowing forces to be absorbed exactly where they are introduced. This maintains assembly ease while dramatically improving force absorption capability and eliminating undesired moments.
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a boom of a crane, in particular a tower crane, with at least a first and a second boom section, which are connected to each other by means of at least one connecting device and which each have at least one lower chord (10, 20) and/or upper chord, wherein the connecting device consists of a pin (22), a recess (12) receiving it and a fixing element (40) which fixes the boom sections relative to each other, wherein the pin (22) extends from the end face of the lower or upper chord of the first boom section and wherein the recess (12) is located in the end face of the lower or upper chord of the second boom section.