Browsing by Subject "multibucket wheel excavators"

Now showing 1 - 2 of 2

Access status: Open Access ,
Analiza wytrzymałościowa koła czerpakowego koparki w warunkach założonej wydajności
(Wydawnictwa AGH, 2011) Czmochowski, Jerzy; Kaczyński, Paweł; Moczko, Przemysław
Assembly, which is particularly strained and vulnerable to failures is the mining system of multibucket excavators, especially the buckets and the bucket wheel. The paper presents a strength analysis of bucket wheel at the assumed, required performance. The analysis was conducted for the various categories of land, for a specified number of buckets, velocities and power of transmission system. This issue is particularly important at changing the mining conditions and possibilities of increasing efficiency while maintaining the required stability. An analysis of the forces encountered during excavation was conducted. The total resistance of the mining, cutting resistance torque and power at the assumed resistance of the mining efficiency were determined. These data are included in the carried out strength calculations according to PN-G-47000-2 standard, which allowed to assess the applicability of the assumed productivity.
Access status: Open Access ,
Numeryczno-doświadczalna analiza drgań wysięgnicy koparki wieloczerpakowej kołowej
(2007) Czmochowski, Jerzy
The adverse vibrations of elements of excavator supporting structure are the significant problem observed during the exploitation of multibucket wheel excavators. The source of these vibrations is the changeable loading from the mining process and from the moving output on the conveyors, as well as the strokes in the tranship points. Because of the large dimensions of these machines significant deflections of masts, fixed jibs, bucket wheel booms and counterweight boom are observed during the machine moving. The aim of the study is the numerical-experimental vibration analysis of the fixed jib of one of the excavators, which the lateral deflections during the mining and moving are observed in. For this reason the equivalent measurement system that bases on the accelerometer sensors for vibration recording and frequency analysis is used. For the numerical simulation, the shell model for calculation with use of Finite Element Method (FEM) that enables to conduct the analyses of local and global vibrations was elaborated. The FEM model was tuned to parameters determined during the measurements done on the object. Correctly prepared computer model has enabled the collaboration of various variants of structural changes, that purpose is to decrease the disadvantageous vibrations of the measured assembly.