Hoist Brake Fail-Safe Mechanism
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Solution Overview
Problem
Existing hoist brake systems require early engagement, manual adjustment due to wear and vibration, lack built-in failsafe mechanisms, and are not effective in emergency situations like power loss, leading to safety and maintenance concerns.
Innovation Solution
An electro-mechanical brake system with a default engaged position, powered by a microprocessor-controlled motor that applies clamping force via a torsion spring, allowing precise control and rapid stopping, and is self-contained within the hoist, enabling emergency braking and minimizing maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a prior art hoist brake system is used, then the brake can be applied to stop the hoist, but the brake requires manual adjustment over time due to wear and alignment issues
Solution Approach 1:
The brake system incorporates self-adjusting mechanisms that automatically compensate for wear and alignment changes without requiring manual intervention. The system monitors its own state and performs adjustments autonomously, eliminating the maintenance burden of manual realignment while preserving reliable stopping capability.
Solution Approach 2:
The brake system includes sensors and control mechanisms that continuously monitor brake pad wear, alignment status, and braking performance. This feedback loop enables the system to detect degradation and automatically initiate corrective actions, ensuring consistent reliability while eliminating manual adjustment requirements.
2Reliability
If a prior art hoist brake system is used, then the brake can slow or stop the hoist drum, but the brake requires early engagement to stop the hoist line at a desired location
Solution Approach 1:
The brake system is designed with pre-positioned brake pads and pre-loaded spring mechanisms that are ready for immediate engagement. The system maintains optimal brake clearance and tension continuously, eliminating the need for early engagement and enabling instant stopping at the desired location whenever needed.
Solution Approach 2:
The brake system incorporates dynamic adjustment mechanisms that automatically optimize brake pad position and contact force based on real-time operating conditions. This dynamic adaptation enables the brake to engage effectively at any moment without requiring advance preparation or early engagement, improving both positioning accuracy and response time.
3Ease of operation
If a prior art hoist brake system is used, then the brake can apply friction to stop the hoist, but the brake lacks built-in failsafe structures for power loss or emergency conditions
Solution Approach 1:
The brake system incorporates spring-loaded brake pads that are pre-loaded in the engaged position, creating a failsafe mechanism where the default state is braking. In the event of power loss or emergency conditions, the springs automatically apply the brakes without requiring additional energy or complex control systems, providing inherent safety while maintaining operational simplicity.
Solution Approach 2:
Instead of using energy to maintain the brake in an engaged state, the system inverts the approach by using spring force to maintain engagement and only requiring energy to release the brake during normal operation. This inversion provides built-in failsafe protection for power loss scenarios while actually reducing overall system complexity by eliminating the need for complex emergency braking mechanisms.
4Reliability
If an electro-mechanical brake system with spring bias is used, then the brake provides fail-safe stopping capability, but the system requires an opening drive system with motor and microprocessor control
Solution Approach 1:
The system merges the electro-mechanical opening mechanism with the mechanical brake release function into a single integrated assembly. The motor-driven cam mechanism that opens the brake during normal operation also serves as the release mechanism for the fail-safe springs, combining multiple functions into one compact unit and reducing overall system complexity while maintaining fail-safe capability.
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
The system ensures safe and rapid stopping of the hoist within milliseconds, even under heavy loads, reduces maintenance needs, and provides enhanced safety through fail-safe mechanisms and precise control, addressing the limitations of prior art hoist brakes.
Implementation Method 1
A spring biases a control arm to maintain the brake system in an engaged position, which applies a clamping force sufficient to prevent any further movement of the hoist
Implementation Method 2
The opening drive system provides force by taking advantage of an electrical motor which pulls against the torsion spring increasing the rotary torque being applied to the mechanical brake portion of the brake mechanism
Implementation Method 3
Some braking mechanisms apply friction directly to the hoist drum to slow/stop rotation of the drum
Data Source
AI summary
A hoist brake system is disclosed. The brake system incorporates an electro-mechanical device that acts as a fail-safe stopping mechanism for a hoist and has a default engaged. This allows the brake system to quickly and safely stop a device when power is lost, an emergency signal is provided or any other fault condition and be completely self-contained within the hoist itself.