Research On Axial Force Testing Technology Of Pump Shaft

With the continuous development of the times, more and more pumps are applied inthe various departments. The size of the pump axial force is one of the key factors which isable to reliably affect the safe operation of the pump. If the pump axial force is too large, itwill affect the safe operation of the pump and reduce the life of the pump, resulting inserious consequences. Therefore, the issue of the axial force whether the pump is safe andreliable operation of the state plays an important role.This article describes the pump axial force measured relevant literature, the causes ofthe pump axial force and the significance of the situation and development of the axialforce tests domestic and international. The basic idea of ANSYS finite element method andthe basic structure of the axial force of the elastic element are expounded in detail. Thefinite element method is used by the steps of finite element modeling, meshing, solvingand post-processing to simulate and analyze. Three loadings of pressure, concentration anda single loading are analyzed and compared. The maximum strain of the elastic element is238με and the stress of the elastic element is235MPa. The maximum stress is in thematerial yield limit of443MPa. The structure of elastic component is optimized design.The angle of force surface, thickness of ring and number of force surface are analyzed. Bycomparing each structure of the maximum strain, the maximum stress and sensitivity, themost optimized design of the elastic element is achieved. Dynamometer methods of theaxial force are described and the indirect measuring method is used to test the axial force.Hardware test system is designed, mainly by the strain sensor, bridge excitation circuit,preamplifier circuit and acquisition system. The various parts of the circuit are designedand analyzed. The shortcoming of the circuit is zero drift which is inhibited. Acquisitionpart first with the PMD-1208LS data acquisition card, the advantages of this acquisitioncard is introduced. LabVIEW software is selected in PC programming. The characteristicsof the virtual instrument and interface design are introduced. Static characteristics aredescribed and a block diagram of a static calibration system is showed. All aspects of thestatic calibration is described in detail. By loading and unloading of the test calibration, the fitting curve of system static calibration is achieved.Finally, the elastic element and the force testing system which have been designed areused to test the pump of the axial force. According to the static calibration curve, the sizeof the axial force is calculated.