Crane Trolley Frame Segmentation and Pivoted Joint for Load Stress
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Solution Overview
Problem
Current crane trolley structures experience heavy local strain and torsional stresses due to hoisting loads, and are not adaptable to different rope drum lengths or pulley arrangements, leading to wear in the hoisting rope and limited flexibility in rope drum positioning.
Innovation Solution
The rope pulley arrangement is located partly or entirely outside the rope drum end, with the support frame structure divided into two parts, allowing relative movement via a pivoted joint, enabling the use of standardised frame components for various rope drum lengths and pulley sizes, reducing bending torque and improving trolley run properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the rope drum is positioned within the trolley structure, then the structure is compact, but the rope drum length cannot be changed and causes heavy local strain and torsional stresses
Solution Approach 1:
The support frame structure is divided into two separate frame parts: a first frame part supporting the rope pulley arrangement and one end of the rope drum, and a second frame part supporting the opposite end of the rope drum. This segmentation allows independent optimization of each part and enables adaptation to different rope drum lengths without compromising overall structural strength.
Solution Approach 2:
The rope pulley arrangement is located outside the rope drum end in the axial direction, creating spatial separation between the load-bearing elements and the rotating drum. This dimensional arrangement reduces torsional stresses on the frame structure while maintaining adaptability to different drum lengths.
2Object-affected harmful factors
If the rope pulley arrangement is inside the rope drum, then the structure is compact, but rope bends cause wear in the hoisting rope
Solution Approach 1:
The rope pulley arrangement is extracted from inside the rope drum and positioned outside the rope drum end in the axial direction. This extraction eliminates harmful rope bends and wear caused by tight curvature inside the drum, while the separated frame parts manage the increased spatial requirements.
3Ease of operation
If the support frame structure is rigid, then structural strength is maintained, but trolley run properties deteriorate
Solution Approach 1:
A pivoted joint is introduced between the first and second frame parts, allowing relative movement around vertical, horizontal, and longitudinal axes. This dynamic connection enables the frame to adapt to track irregularities and improve trolley run properties while the segmented structure maintains overall strength through optimized load paths.
Data Source
AI summary
A trolley of a crane is arranged to move along a main support structure of the crane. The trolley includes a support frame structure; bearing wheels which are fastened to the support frame structure and by means of which the trolley is arranged to move along the main support structure; and a hoisting mechanism that has a rope drum for a hoisting rope, a rope pulley arrangement through which the hoisting rope may be guided from the rope drum to a fixed fastening point on the trolley, and a hoisting member in cooperation with the hoisting rope for hoisting a load. The rope drum is supported to the support frame structure of the trolley so that the axle of the rope drum is parallel to the main support structure. The rope pulley arrangement is located, in the axial direction of the rope drum, at least partly outside one rope drum end which is on the side of said fastening point. The support frame structure is divided into two separate frame parts, whereby the first frame part supports the rope pulley arrangement and the rope drum end on the side thereof, and whereby the second frame part supports the opposite end of the rope drum. A pivoted joint is arranged between the first frame part and the second frame part, which allows the first and second frame part to move relative to each other around the vertical and horizontal axis and the longitudinal axis of the first and second frame part.