Luffing Jib Crane Articulation Below Punch for Transportability
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Solution Overview
Problem
Conventional luffing jib cranes face challenges in improving performance without increasing the length of the punch, which affects transportability and requires additional structural reinforcements.
Innovation Solution
The luffing jib crane design shifts the articulation of the luffing jib to the base of the counter-jib's central section, below the punch's foot, effectively increasing the fictitious length of the punch by positioning the rear end of the luffing jib lower on the central section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the length of the punch is increased to improve performance and reduce forces, then productivity and structural efficiency are improved, but transportability deteriorates and requires removable punch or additional structural reinforcements
Solution Approach 1:
The patent relocates the luffing jib articulation from the top of the punch (vertical dimension) to the base of the counter-jib (horizontal/ground dimension), effectively using the counter-jib structure as an extension of the punch. This dimensional shift allows the functional length to increase without increasing the physical punch length, resolving the contradiction between performance and transportability.
2Weight of moving object
If the length of the punch is increased to reduce the weight of the luffing jib by increasing the tie rod angle, then structural efficiency is improved, but the punch requires greater structural reinforcements
Solution Approach 1:
The patent introduces the counter-jib as an intermediary structural element that mediates between the punch and the luffing jib. By articulating the luffing jib to the base of the counter-jib rather than directly to the punch top, the system distributes forces more efficiently, reducing the weight of the luffing jib without requiring additional reinforcements on the punch itself.
3Device complexity
If the luffing jib articulation is positioned at the top of the punch to simplify structure, then device complexity is reduced, but access and maintenance become more difficult
Solution Approach 1:
Instead of positioning the articulation at the top (highest point) of the structure, the patent inverts the approach by locating it at the base of the counter-jib (lowest point), which is more accessible for maintenance while maintaining structural simplicity through the lever arm extension.
Data Source
AI summary
Luffing jib crane includes a mast surmounted by a rotating part orientable about a vertical axis and a rotating pivot pivotally mounted on the mast. The luffing jib crane further includes a counter-jib including a central section and a horizontal radial section directed rearwards and fastened to the central section which comprises a base fastened to the rotating pivot and a top (65) surmounting the base. The luffing jib crane further includes a luffing jib directed forwards and having a rear end articulated to the base of the central section of the counter-jib, below the top, in a manner diametrically opposed to the radial section of the counter-jib. The crane has a punch fastened to the top of the central section of the counter-jib, and extending obliquely upwards and backwards from the top.