Trolley Overload Brake Using Girder Elastic Deformation
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Solution Overview
Problem
Existing overload prevention systems for trolleys in lifting and handling equipment often rely on load limit detection devices that may fail or be inoperable, leading to the risk of lifting loads beyond the maximum capacity, which can result in unsafe operations and potential damage.
Innovation Solution
An overload brake system for trolleys that utilizes elastic deformation of the girder flanges to activate a brake mechanism, preventing trolley displacement when an overcapacity load is attempted by compressing brake disks between the flange tabs, thereby ensuring safe operation within the load limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If load limit detection devices are used to prevent overload lifting, then lifting safety is improved, but the device complexity increases and the devices may fail or be inoperable
Solution Approach 1:
The girder structure serves itself as the sensing element for overload detection. The flange tabs inherently detect overload conditions through elastic deformation when excessive loads are applied, eliminating the need for separate load limit detection devices. This self-service approach improves reliability while reducing device complexity.
Solution Approach 2:
The patent extracts the overload detection function from separate complex detection devices and integrates it directly into the girder structure itself. The flange tabs become the sensing elements, removing the need for additional independent detection mechanisms and their associated complexity.
2Reliability
If mechanical devices with elastic deformation mechanisms are used to limit trolley translation, then overload prevention is improved, but the device complexity and additional mechanisms required increase
Solution Approach 1:
The patent merges the overload detection function and the braking function into a single integrated mechanism. The flange tabs both detect the overload condition through their deformation and simultaneously activate the brake by moving the brake shoes against the wheels. This combines multiple functions into one mechanism, reducing overall device complexity.
Solution Approach 2:
The flange tabs serve multiple functions: they are structural support elements, overload sensing elements, and brake activation elements. This multi-functionality eliminates the need for separate mechanisms for each function, reducing device complexity while maintaining reliable overload prevention.
3Reliability
If brake disks are compressed between flange tabs to prevent trolley displacement, then safety is improved, but the force required from the girder increases
Solution Approach 1:
The brake activation force is made dynamic rather than static. The flange tabs only generate sufficient braking force when elastic deformation occurs due to overload conditions. Under normal operating loads, the tabs remain in their original position and exert minimal force. This dynamic activation ensures safety when needed while minimizing force requirements during normal operation.
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
Effectively prevents trolley displacement and ensures safe handling by automatically engaging the brake when an overload is detected, enhancing safety and preventing potential damage to equipment and loads.
Implementation Method 1
the girder lower flanges 1a and 1b elastically deform by the action of vertical load applied by the circular surfaces of wheels 3
Data Source
AI summary
An overload brake and method for trolley suspended on a flange of a load traveling apparatus girder prevents the displacement movement of a suspended load along a girder by clamping a brake between two symmetrical flange tabs of the girder. The girder is elastically deformed by the load which is applied to the girder by the contact between a surface of the girder and translation wheels that move the load along the girder. Upon sufficient elastic deformation, portions of the girder contact a brake to prevent movement of the load along the girder.