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Transactions: WSEAS TRANSACTIONS ON SYSTEMS AND CONTROL
Transactions ID Number: 31-467
Full Name: Marin Silviu Nan
Position: Professor
Age: ON
Sex: Male
Address: Str. Universitãþii, Nr.20, Petroºani
Country: ROMANIA
Tel: 0040722437666
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E-mail address: mnan@upet.ro
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Title of the Paper: Balance Control by Weighting and Tensiometric Measurements of Bucket Wheel Excavators
Authors as they appear in the Paper: Marin Silviu Nan, Iosif Kovacs, Florin Dumitru Popescu
Email addresses of all the authors: mnan@upet.ro, ikovacs@upet.ro, fpopescu@gmail.com
Number of paper pages: 10
Abstract: An essential element when establishing the balance of a bucket wheel excavator is the determination of the barycentre, the best results being thus obtained by weighting after having installed all the components. The problem, on which emphasis is laid, is how to maintain the stability and equilibrium of bucket wheel excavators or any other extraction machinery during operation, the main machinery of a technological extracting system employed for coal mining. The balance survey, respectively that of the stability of these machineries is compulsory because the bearing surface is rather small compared to the other building sub-systems outside the range of the surface, onto which much higher forces operate. The lack of correct balance for bucket wheel excavators determines their operation in an inadequate dynamic mode, or in extreme cases, there is the danger of losing stability by tilting over the excavator respectively suffering huge material and human loss. It is com!
pulsory to verify for the correctness of the position and mass value of balance because there might be substantial error sources leading to compromise the operation. One of the most popular methods is that of weighting the entire equipment from the superior platform of the excavator. The weighting process implies the lifting of the excavators in three spots with hydraulic cylinders, the measurement of the forces, as well as the measurement of pressure inside the cylinders and of the stroke of each cylinder. The data measurement and rehashing installation is destined to determine the dimensions that finally define the weighting process of excavators or other operating machineries to which the balancing and control of stability is imposed. Thus, two types of data measurement and rehashing installations depending on the nature and type of the transducer used will be presented. For the first type, only analogical signals are transmitted to a numerical computer, and for the seco!
nd type only digital signals are transmitted.
Keywords: Barycentre, Tensiometric bridge, Excavator, Force Transducer, Pressure Transducer
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