Overhead Crane Hoist Braking With Delayed Secondary Engagement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing overhead crane hoists face inconsistent brake operation due to mechanical wear and environmental factors, leading to potential load drops and safety concerns, requiring labor-intensive maintenance and setup.
Innovation Solution
A multiple brake hoist system with primary and secondary brakes, utilizing electromagnetic and capacitive energy storage to maintain consistent time-delayed engagement of the secondary brake, eliminating the need for external power sources or mechanical timing components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If external hydraulic or friction devices are used to control time-delay braking, then the braking function can be achieved, but the system reliability deteriorates due to mechanical wear and environmental factors
Solution Approach 1:
The patent replaces the mechanical hydraulic or friction-based time-delay devices with an electromagnetic system. The power supply uses electromagnetic fields and capacitive energy storage to control the timing of brake engagement, eliminating mechanical wear components and providing consistent, reliable operation不受 environmental factors影响.
Solution Approach 2:
The power supply system automatically manages the time-delay function through its internal electromagnetic and capacitive components. The system self-regulates the energy discharge timing to engage the secondary brake after the predetermined interval without requiring external control devices or manual intervention, reducing maintenance requirements.
2Loss of time
If external power sources or mechanical timing components are used for time-delay braking, then the braking timing can be controlled, but the device complexity increases
Solution Approach 1:
The patent combines the power supply function with the time-delay control function into a single integrated system. The power supply unit incorporates capacitive energy storage and electromagnetic control circuits that automatically provide the predetermined time-delay for secondary brake engagement, eliminating the need for separate external timing devices or mechanical components.
Solution Approach 2:
The power supply system performs multiple functions: it provides electrical power to the brakes, stores energy in capacitive components, controls the timing of energy discharge, and manages both primary and secondary brake operations. This multi-functional design reduces overall system complexity by eliminating dedicated separate components for each function.
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
Ensures reliable and consistent brake engagement during normal and emergency operations, reducing the risk of load drops and simplifying maintenance, while maintaining safety without external energy storage or mechanical timing delays.
Implementation Method 1
A power supply is provided for supplying electrical power to the primary and secondary brakes. The power supply is configured to retain a predetermined amount of electromagnetic and capacitive energy upon deactivation.
Implementation Method 2
The power supply is configured to retain a predetermined amount of electromagnetic and capacitive energy upon deactivation.
Implementation Method 3
The primary brake and secondary brake each include a biasing spring and a corresponding electrical coil. These springs respectively establish the engaged state upon deactivation, while the power supply cooperates with the coils to respectively maintain the biasing springs in the non-engaged state during activation.
Data Source
AI summary
A multiple brake hoist system includes a hoist for lifting and lowering a load and a power supply for supplying electrical power to the hoist. The power supply is configured to retain electromagnetic and capacitive energy upon deactivation. Primary and secondary brakes engage the hoist upon deactivation from the power supply. The primary and secondary brakes are connected to the power supply in a fail-safe configuration to maintain a non-engaged state on the hoist during activation of the power supply. The primary brake establishes an engaged state on the hoist upon deactivation from the power supply. The secondary brake establishes an engaged state on the hoist after a predetermined time-delay associated with consuming the predetermined amount of electromagnetic and capacitive energy of the power supply upon deactivation. In this manner, the primary and secondary brakes prevent a differential torsional stress between the mechanical components upon deactivation of the power supply.