Pivoting Roller Brake for Elevator Bounce and Vibration
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Solution Overview
Problem
Existing roller systems in elevator systems experience bounce and vibration due to traction rope or belt deformation, leading to inadequate braking and vibration when passengers or goods are loaded or unloaded, as the prior art's friction between the brake and roller is insufficient.
Innovation Solution
A roller brake device with a pivotable brake mechanism, actuation lever, and biasing springs that engage and disengage the brake from the roller, providing enhanced static friction and reliable braking by leveraging the pivotable design and actuation mechanism to ensure effective braking without relying solely on the actuation force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a brake device is added to inhibit roller rotation, then bounce and vibration are reduced, but device complexity increases
Solution Approach 1:
The brake device is segmented into independent functional components: a brake arm that can pivot independently, a biasing device that provides automatic spring pressure, and an actuation mechanism that triggers braking only when needed. This segmentation allows each component to perform its specific function efficiently while keeping the overall structure manageable and maintainable.
Solution Approach 2:
The biasing device automatically maintains constant spring pressure on the brake arm, ensuring the brake is always ready to engage without requiring continuous external adjustment or monitoring. The system serves itself by using the biasing device to automatically compensate for wear and maintain optimal braking force.
2Reliability
If friction between brake and roller is increased, then braking effectiveness is improved, but wear and heat generation increase
Solution Approach 1:
The brake operates periodically rather than continuously - it engages only when the elevator car stops and needs to be held stationary, and disengages when the car needs to move. This periodic action reduces cumulative wear and heat generation while maintaining reliable braking when needed, as the brake surfaces are not in constant contact.
Solution Approach 2:
The brake engagement is designed to be quick and decisive - the actuation mechanism rapidly moves the brake arm from the disengaged position to the engaged position, applying full braking force immediately. This rapid engagement and disengagement minimizes the time during which friction is active, reducing wear and heat generation while ensuring reliable stopping.
3Power
If actuation force is increased to improve braking, then braking power is improved, but energy consumption increases
Solution Approach 1:
The brake arm is designed to be pivotable rather than fixed, allowing it to dynamically adjust its position and leverage ratio. When engaging, the brake arm pivots to optimize the mechanical advantage, requiring minimal actuation force to generate high braking power. The dynamic pivot mechanism allows the system to achieve high braking force with low actuation energy input.
Solution Approach 2:
The brake arm utilizes a curved or arc-shaped contact surface that matches the roller's curvature. This spherical/curved geometry allows the brake to engage smoothly and leverage the roller's rotational force, converting a small actuation force applied at one point into high braking force through the curved lever arm geometry.
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 solution provides reliable and effective braking by generating significant static friction between the brake and roller, reducing bounce and vibration, and allowing for easy adjustment and maintenance, ensuring the roller remains stationary during loading and unloading.
Implementation Method 1
providing enhanced static friction and reliable braking by leveraging the pivotable design and actuation mechanism to ensure effective braking
Implementation Method 2
A roller brake device with a pivotable brake mechanism, actuation lever, and biasing springs that engage and disengage the brake from the roller
Data Source
AI summary
A roller system, a roller brake device and an elevator system. The roller brake device is used for the roller system. The elevator system includes the roller system. The roller system comprises a roller assembly and a roller brake device, the roller brake device includes: a body, the roller brake device is mounted to the roller assembly by the body; an actuation device mounted to the body; and a brake connected to the body in a pivotable manner, and the actuation device can move the brake from a rest position to a brake position, wherein the brake engages and brakes a roller in the roller assembly at the brake position, and the brake is disengaged from the roller at the rest position.