TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Viewpoints on the Possibility to Use an Unbalanced Wheatstone Bridge to Measure the Bit Weight
(Consideraţii privind posibilitatea utilizării punţii Wheatstone neechilibrate la măsurarea apăsării pe sapa)
Vol LXII • No. 4B/2010
Ioan Savulescu, Alexandru Savulescu
Universitatea Petrol - Gaze din Ploieşti, Bd. Bucureşti 39, Ploieşti

 Keywords   bit weight, hook load, strain gauge, unbalanced Wheatstone bridge, resistance, elongation, stress, unbalance voltage.

 Abstract
Based on certain inconveniencies of the hydraulic load cells that are currently used on a broad scale to measure the load on the hoisting hook of the drilling rigs (and indirectly on the bit weight), the authors suggest that electronic measurement systems should be developed and used with the clear purpose of increasing the tensoresistive effect. A strain gauge MT applied on a circular section flexible metal rod that was inserted at the dead end of the calf wheel cable is positioned in one of the legs of the unbalanced Wheatstone bridge. The unbalance voltage of the bridge will be a dimension of the tensile stress on the measuring drum cable.

 Rezumat
Pornind de la unele inconveniente prezentate de traductoarele hidraulice de efort utilizate in prezent pe scara larga pentru măsurarea sarcinii la cârligul macaralei instalaţiilor de foraj (si in mod indirect a apăsării pe sapa) ,autorii propun in acest scop realizarea si utilizarea unor sisteme de măsurare electronica ce are in vedere valorificarea efectului tensorezistiv. O marca tensometrica MT aplicata pe o bara metalica elastica de secţiune circulara inseriată pe capătul mort al cablului tobei de manevra este amplasata intr-unul din braţele unei punţi Wheatstone neechilibrate. Tensiunea de dezechilibru a punţii va fi o măsura a solicitării la întindere la care este supus cablul tobei de măsura.



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