Scholarly record

TEMPERATURE GRADIENT IN RUBBER COATING OF A STACKER DRIVING DRUM

M. Neubert, J. Nedbal, V. Velychko, H. Valentova, J. Jochman

Abstract

Conveyor belt slip on a driving drum belongs to dangerous accidents that may result in a fire and burning of the rubber belt cover and drum coating under not well described conditions. To prevent such situations temperature of the rubber coating is often monitored by optical methods. We argue that these optical measurements may not monitor the initial phase of belt slipping thoroughly enough and that they cannot predict the incoming danger. We propose to measure continuously the temperature gradient in the rubber coating of a stacker driving drum by a direct method that is more convenient for the mine operational conditions. Equipment capable to measure the temperature of moving segments of belt conveyors (bearings and coatings of conveyor cylinders, conveyor belts) under real operational conditions (temperature, humidity, dustiness) was designed and tested in a coal mine. Equipment utilizes modern microcontroller technique and internal data exchange based on the RFID method. One part of the equipment (TAG) connected with the moving segment is maintenance-free and battery-free. Second part – supplied from distribution network - connected with the steady construction (READER) enables collection and evaluation of data with an option to supply data to PC or a control system. Results of a year-long temperature testing are presented and the temperature gradient behavior of the stacker driving drum is described. Local temperature anomalies are shown and interpreted as an initial phase of belt slipping luckily not resulting in a fire.

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