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Rotating parts such as shafts, gear wheels, ball bearings or rollers are subject to wear that limits their lifetime. Damage causes production downtime and consequential damage to the entire production plant. This system design makes it possible to record and wirelessly transmit measured values on rotating parts without an additional voltage source. The prototype is presented using the example of an application on a support roller and the economic efficiency of the system is
analysed.
This paper examines the surface roughness and power consumption of the machine when
using different inserts and cutting parameters in rough turning. For this purpose, the surface quality of the parts, cutting parameters at different levels (cutting speed, feed rate, depth of cut) and optimal tools that influence the energy when machining S355JR steel material of different cutting tools were used in the turning process.
The Vibro Displacement Column (VDC) is one of the most widely-used techniques in
ground improvement. The present design of the column is exposed to high stresses from the soil during operation. There has been an increased fracture failure on basic parts of this VDC which has led to increase the downtime in construction projects. The major points of failures are identified and analyzed. Optimized design is presented after undergoing functionality experiments.
Belt conveyors are highly efficient systems used in mining and other industries to transport bulk materials, mainly brown coal and overburden, over distances ranging from short distances to several kilometres. For technical reasons, their operation is associated with noise emissions. During inspections and maintenance this can lead to increased noise exposure of employees. In the vicinity of residential buildings or in areas needing protection, exceeding the emission limits can lead to a temporary restriction of the operation of these high performance installations. Measures are required to reduce the noise impact primarily at the source or in the immediate vicinity. The acoustic and mechanical parameters are investigated on a test bench at the Technical University of Brandenburg (BTU) Cottbus-Senftenberg as part of the drive assembly tests in cooperation with LEAG. The stages of these tests are: Run-up test. In this test the supporting roller is accelerated under test load to a circumferential speed of 10 m/s and the sound pressure level is recorded. This makes it possible to calculate the sound emission as a function of the peripheral speed; Recording the geometry of the idler gear. An accurate description of the geometry of the idler housing allows conclusions to be drawn about the possible causes of excitation. The defined characteristics serve to quantify the acoustic effect of the driven rollers and derive specifications for use in belt conveyor systems. Based on the special requirements to the planned belt conveyor system, an adapted selection of low-noise idler rollers can be made at an early stage on the basis of specified parameters and confirmed test results.
Labyrinthdichtringe (LDR) in Tragrollen von Gurtförderern bestehen aus mehreren Elementen welche im Betrieb aneinander "reiben" sollten (LDR außen, Fett, LDR innen) und sich infolge dessen erwärmen können. Eine weitere Erwärmung kann durch die wirkenden Kräfte und Wettereinflüsse erfolgen. Die Erwärmung überträgt sich auf das Schmiermittel und beeinflusst damit die Schmierfähigkeit sowie das Fließverhalten des
Schmiermittels. Der Labyrinthdichtring einer Tragrolle wurde für die Untersuchung der Eigenerwärmung mit Temperatursensoren ausgerüstet. Auf einem Tragrollenprüfstand der BTU Cottbus-Senftenberg wurden während mehrerer Langzeitversuche die Temperaturen gemessen und aufgezeichnet. Die aufgenommenen Temperaturkurven zeigen den typischen Verlauf eines Verzögerungsgliedes 1.Ordnung wobei die Aufheiz- und
Abkühlkurven unterschiedliche Zeitkonstanten aufweisen. Außerdem zeigen sich teilweise kurz vor dem Übergang zum stationären Zustand weitere kurzzeitige Temperaturerhöhungen. Die Untersuchungen dienen als Vorarbeiten für weitere Messungen und Optimierungen an Labyrinthdichtringen von Tragrollen.