详情

原文传递 TURN AGAIN

题名：	TURN AGAIN
正文语种：	eng
摘要：	Describing how roller brake testers work is VLT Test Services director Brian Beacon: "The system is basically a motor working via a gearbox with a chain that drives the rollers. Between the gearbox and the axle rollers, a strain gauge measures the amount of torque on the rollers as the brake is applied. That is converted into digital milliamp signals that is then transferred to the basic brake pressure." Despite being robust enough to withstand up to 20t axle loads, roller brake testers (RBTs) are still required to produce precision measurements of braking force day after day. Misuse, and wear and tear, are the biggest maintenance issues that they face, he contends. "The worst thing is when they are driven over at high speed; the shock can damage the measuring equipment." There are wearing parts, he adds: the chain wears and stretches, and there are bearings that can wear. Over time, electronic components such as load cells and strain gauges will fail, as will various sensors and perhaps the motor or gearbox, too. RBTs work best if looked after properly - or as Beacon puts it, "servicing, greasing, cleaning, adjusting and calibration" at six-monthly intervals.
出版年：	2023
期刊名称：	Transport engineer
期：	Nov.
页码：	27-27