ELEVATOR DRUM-PAD BRAKE MECHANISMS: REDUNDANT CONSTRAINTS AND RELIABILITY RISE OPPORTUNITY

Abstract

The article deals with mechanical engineering, and transport machines, namely the elevator brake mechanism structure. The article aims to study the number and location of redundant constraints in elevator brake mechanisms and to depict their impact on brake reliability and transportation safety. To study the structure of the mentioned mechanisms, we used classical methods of applied mechanics plus the circuit method of L. Reshetov. The structure of crane disc brakes with short-stroke DC electromagnet and long-stroke AC electromagnet mechanisms was analyzed and redundant constraints were identified. It was shown that the presence of redundant constraints causes friction torque oscillation and lead to load distribution unevenness between brake elements. Based on the provided analysis, construction improvement events should be implemented to remove the most dangerous redundant constraints.

Keywords

• drum-pad brake
• redundant constraint; mechanism
• friction torque
• reliability
• self-alignment