Research on quantification and dynamics of running resistance of ultra-long flexible suspended backfilling scraper conveyor

As the core equipment of solid backfilling mining technology, the operation status of the solid backfilling scraper conveyor directly determines the efficiency and productivity of solid backfilling mining. Currently, due to characteristics such as ultra-long carrying distance and flexible suspension, the backfilling scraper conveyor exhibits complex spatial position and posture and operational conditions, resulting in technical challenges including high running resistance and low transport efficiency. The bending section of the flexible suspended backfilling scraper conveyor is approximated by using a catenary line, and the attitude angle distribution of the central trough of the bending section is analyzed. The concept of straightness coefficient is abstracted to characterize the equivalent bending degree of the backfilling scraper conveyor. A morphology-adaptive segmented solving method for characterizing the morphology of the whole machine of the backfilling scraper conveyor is formed. The sources and influencing factors of running resistance in backfilling scraper conveyors are analyzed. The additional resistance in bending section is calculated using the Eulerian Catenary Formula, through which the conveyors resistance equations for both straight and bending sections of the backfilling scraper conveyor are established. The variation law of the running resistance of the backfilling face with the length and straightness coefficient of the working face is analyzed. The simulation models are established for four bending operation conditions: straight condition, horizontal bending condition, vertical bending condition, and coupled bending condition, to derive the kinematic characteristics and variations in running resistance of the chain drive system under these conditions. By comparing the simulation results with theoretical calculations, the accuracy of the formulated running resistance equation is found to be over 97%. Based on the sources and influencing factors of running resistance, regulatory measures and logic for abnormal operating conditions are proposed. Engineering practice results indicate that effective resistance reduction of 150.72 kN and a 26.61% increase in effective power can be achieved through regulation. The carrying efficiency of the solid backfill scraper conveyor is significantly improved.