A Method of Estimating Changes in the Braking Torque as Applied to Brakes of Hoisting Machines

A method of estimating changes in the braking torque in brakes of hoisting machines is proposed, taking into account the factors of temperature and wear of the friction lining. The analysis of changes in the braking torque was performed for different types of friction pairs used in brakes of hoisting machines. Based on the results of numerical experiments, it was found that the temperature factor could lead to an increase, as well as a decrease in the braking torque, while the wear factor — only to a decrease. Simultaneous action of the temperature and wear factors is the most unfavorable combination, in which the braking torque falls outside the allowable range, and the safety requirements for hoisting machine operation are violated. The following recommendations are proposed to improve performance characteristics of braking devices: a more justified approach to the selection of the braking safety coefficient value, strict adherence to maintenance requirements, and the use of automatic wear adjustors and wear detectors for friction linings.

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