Research on stamp charging car coal box pressure through field test

摘要

Coal box pressure has great significance in stamp charging car design. Because of the complexity of the dynamic constitutive relation of the coal powder, the pressure is usually considered in the design as a linear load, which presents neither the instantaneous maximum impact nor the variation during the stamping process, and therefore lacks accuracy. In this research, to obtain a more accurate box pressure, a series of field tests have been conducted, which included side wall tests, bottom plate tests and proof tests. The side wall and bottom plate pressures have been investigated through separating the pressure as 'impulse pressure' and 'coal pressure', which decouples the pressure curves from the side wall and bottom plate tests. As a consequence, a method to calculate box pressure at any time during the stamping has been derived through the analysis of statistic test results. To verify the method, a finite element method (FEM) model has been built and applied with pressures from the method. The FEM results fit well with the proof test result, which indicates that the method is capable of being used for stamp charging car design. In addition, the paper presents some statistic conclusions, such as stamping effect depth, which is useful for further researches.