A Model-Based Unloaded Test Method for Analysis of Braking Capacity of Elevator Brake

Qifeng Peng,Shanqing Li,Guojian Huang,Xueli Sun,Zhongxing Li,Hong Yuan

doi:10.1155/2018/8047490

Abstract

In order to improve the inspection efficiency and accuracy of the braking capacity of the elevator brake being used, a novel method for analyzing the full-loaded braking performance by using the unloaded braking performance is proposed, and a set of methods for measuring the braking torque is designed. Based on the analysis of the key factors that affect the mechanical performance of the elevator brake, the calculation model of the braking torque in the process of the emergency braking with the traction ratio of 2 : 1 is established, and the relationship between the braking torque and acceleration under different working conditions is analyzed. It is shown that, for the model assumed, the emergency braking torque is 1.56 times that of the static braking torque under 1.25 times the rated load. The braking torque increases linearly with the increase of braking acceleration. An elevator model being used is tested and calculated. The experimental results show that the braking acceleration measured by the experiment is 11.95% less than the theoretical value. And the analysis shows that, comparing with the traditional test method, the braking torque test method designed in this paper is more accurate and safe.

Highlights

As the vertical transportation in the building, the elevator is an indispensable electromechanical device, especially in modern high-rise buildings
Compared with static load calculation and emergency braking results under the same load condition, it can be seen that the emergency braking torque is much larger than the static load torque
An elevator model being used is tested and calculated. e experimental results show that the braking acceleration measured by the experiment is 11.95% less than the theoretical value

Summary

Introduction

As the vertical transportation in the building, the elevator is an indispensable electromechanical device, especially in modern high-rise buildings. Once safety function of the brake fails, it often leads to such serious accidents as falling, roofing, and shearing of the elevator car, which brings unacceptable risks and great threats to passengers’ lives and property [5, 6]. E evaluation to performance of brake has been in the qualitative stage, mainly through the loading test [8,9,10]. Many elevators, especially the older ones are difficult to meet the requirements of full-load test. It cannot reliably stop elevators with 1.25 times the rated load and brings high risks

Methods

Results

Conclusion