Low-Construction Trolley Rope Fixing Point
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The asymmetrical positioning of the hoisting rope system in low-construction trolleys for wire rope hoists leads to twisting and increased stress on the trolley and main support, causing premature wear and potential jerking movements due to the imbalance and long lever arms, as well as the risk of rope damage from crossing during lowering.
Innovation Solution
The fixing point of the hoisting rope is relocated outside the vertical plane passing through the end of the rope drum, allowing symmetrical support and reducing twisting, with the option to place the hoisting motor under the beam on a different side to balance the trolley, and allowing for a more compact design that can accommodate more ropes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the hoisting mechanism and rope drum are positioned on the same side of the main support to achieve low construction height, then the vertical space is reduced, but imbalance and long lever arms cause additional twisting and stress on the trolley and main support
Solution Approach 1:
The patent applies asymmetry by positioning the rope drum and hoisting mechanism on the same side of the main support, creating an unbalanced configuration that reduces vertical space occupation. This asymmetric arrangement accepts increased stress and twisting as trade-offs for achieving low construction height, which is the primary design goal.
Solution Approach 2:
The patent introduces a counterweight on the opposite side of the main support to compensate for the imbalance created by positioning the heavy hoisting mechanism and rope drum on one side. This counterweight reduces the net twisting moment and stress on the trolley and main support, allowing the asymmetric low-construction design to function more reliably.
2Area of stationary object
If the fixing point of the hoisting rope is positioned closer to the main support to accommodate space constraints, then the rope system fits in limited space, but long lever arms cause additional twisting and stress
Solution Approach 1:
The patent resolves the space-stress contradiction by changing the spatial arrangement from a horizontal layout to a vertical arrangement. The hoisting rope is guided upward through a rope pulley arrangement positioned above the main support, then down to the load. This vertical dimensionality change allows the fixing point to be closer to the main support while reducing the horizontal lever arm length, thereby decreasing twisting and stress on the bearing wheels and main support.
3Volume of moving object
If the rope system is arranged in a compact configuration to reduce hall height, then the trolley construction is minimized, but the hoisting rope may cross and damage itself during lowering
Solution Approach 1:
The patent introduces a rope pulley arrangement as an intermediary element that mediates the path of the hoisting rope. The rope is guided through this pulley system, which maintains proper rope alignment and prevents the hoisting rope from crossing with itself or other rope segments during lowering operations. This intermediary mechanism preserves rope integrity while maintaining the compact low-construction design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces twisting and stress on the trolley and main support, prevents rope crossing, and enables a more efficient hoisting mechanism that can handle larger loads with reduced wear on components, allowing for safer and easier installation.
Implementation Method 1
bearing wheels that are attached to the frame of the trolley and arranged to travel on the upper surface of the lower flange of the beam or rail
Implementation Method 2
bearing wheels that are attached to the frame of the trolley and arranged to travel on the upper surface of the lower flange
Implementation Method 3
the hoisting rope is led from the rope drum to a fixing point in the trolley frame through at least a rope pulley arrangement of the hoisting member
Data Source
AI summary
A low-construction hoist for a wire rope hoist is arranged to move along a lower flange of a horizontal beam or rail. The trolley includes a trolley frame; bearing wheels, which are fixed to the trolley body and arranged to move on the upper surface of the lower flange of the rail, a hoisting mechanism including a rope drum for a hoisting rope, a hoisting member in cooperation with the hoisting rope for hoisting a load, and a hoisting motor for driving the rope drum; whereby the rope drum is supported to a first side of the trolley frame so that the axle of the rope drum is parallel to the rail, and the hoisting member is arranged to move under the rail; whereby the hoisting rope is led from the rope drum to a fixing point in the trolley frame through at least a rope pulley arrangement of the hoisting member, whereby the fixing point of the hoisting rope to the trolley frame is located in the longitudinal direction of the trolley outside the end of the rope drum, or outside the vertical plane which is transverse in relation to the rail or beam and passing through the end of the rope drum.