Crane Trolley Frame Segmentation for Rope Drum Adaptability
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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 standardization of load support.
Innovation Solution
The support frame structure is divided into two separate parts, with one part supporting the rope pulley arrangement and the rope drum end, and the other part supporting the opposite end of the rope drum, allowing for the use of the same frame components with varying rope drum lengths and pulley arrangements, reducing bending torque and tensile stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the rope drum is positioned within the trolley structure with fixed dimensions, then the trolley structure is compact and stable, but the structure cannot adapt to different rope drum lengths or pulley arrangements, causing heavy local strain and torsional stresses
Solution Approach 1:
The support frame structure is divided into two separate frame parts: a first frame part that supports the rope pulley arrangement and one end of the rope drum, and a second frame part that supports the opposite end of the rope drum. This segmentation allows each frame part to be optimized independently and enables adaptation to different rope drum lengths and pulley arrangements while maintaining structural strength.
2Object-affected harmful factors
If the rope pulley arrangement is located inside the rope drum, then the structure is compact, but bends in the rope pulley arrangement cause wear in the hoisting rope
Solution Approach 1:
The rope pulley arrangement is extracted from the interior of the rope drum and positioned on the first frame part, at least partly outside the rope drum end. This extraction eliminates the harmful bends that cause rope wear while the frame structure is designed to accommodate this arrangement without excessive complexity.
3Adaptability or versatility
If the support frame structure is divided into two separate frame parts, then adaptability to different configurations is improved and bending torque is reduced, but the device complexity increases
Solution Approach 1:
The two-frame-part structure is designed with universal characteristics where the first frame part supporting the rope pulley arrangement and one end of the rope drum can be standardized across different configurations. This universality allows the same basic frame components to be used with varying rope drum lengths and pulley arrangements, reducing overall complexity through standardization.
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 fastened to the support frame structure and by means of which the trolley is arranged to move along the main support structure; 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.