Current gob filling devices are mostly bottom-dump scraper conveyors. Due to the structural characteristics of the scraper, the scraper-type Backfilling Slinger has high working noise, high energy consumption, and low conveying efficiency. In response to the above issues, this paper proposes the structural design of a belt-type gob Backfilling Slinger and suggests using a single-sided plow-type unloader for unloading. This paper models the unloading process mathematically, providing two types of unloading models: one that follows the angle of repose for stacking and the other that spreads evenly in the middle section. Subsequently, an experimental platform is used for unloading experiments to verify the correctness of the model. Finally, by comparing the casting performance of scraper-type and belt-type machines, it is found that, without considering the service life, the unloading capacity of the belt-type gob Backfilling Slinger has increased by about 75% compared to the scraper conveyor.
This study aims to develop an analytical method for calculating the parameters of destruction diagrams of cylindrical rock samples experiencing wedge-shaped fractures, facilitating the effective disintegration of rocks. The method employs analytical modeling to simulate the destruction process of cylindrical rock samples, leveraging experimental values of three key rock properties: shear resistance limit, internal friction coefficient and external friction coefficient. The proposed method accurately determines the limit and residual strength of the rock samples using these three indicators, which can be experimentally obtained through straightforward procedures in mining enterprises. This research marks the first instance of analytically modeling the destruction of cylindrical rock samples with wedge-shaped fractures while accounting for both internal and external friction. The practical application of this method allows for the rapid assessment of stress-strain parameters in rock samples, thereby enhancing the efficiency of rock disintegration processes in mining operations.
The study examines the impact of precipitation on the distribution of apparent specific electrical resistivity (rho a) in the soil through statistical analysis of data measured in a direct current geoelectric DipoleDipole (DPDP) electrode array in the park of the University of Miskolc, on an artificially constructed area. Following data filtering, regression analysis (Montgomery et al., 2012) and analysis of variance (ANOVA) (Montgomery, 2012; Kim, 2014) were applied to investigate the relationship between precipitation and rho a. Separate analyses were conducted for each measured depth level as a function of the precipitation amount recorded over the three months prior to the geoelectric measurements. The combined application of statistical methods provides an effective tool for understanding the hydrogeological state of the soil and the dynamics of subsurface water movement, while considering the influence of environmental factors and human activity. The results of the study may be valuable for interpreting data provided by monitoring systems and for shallow geophysical investigations aimed at mapping the hydrogeological functioning of an area.
The article discusses the dripstone structures in underground anthropogenic objects in the Sudety Mts. This region provides a good model area for studying dripstones due to the great diversity of the geological structure and the nature of underground facilities. The examined objects are primarily historical mines, but also military facilities and a pumped-storage power plant in the construction phase. Based on the recognition of 23 objects, the diversity of dripstones in this area is presented - their forms, the types of minerals that compose these deposits, and the environments in which they form. Atypical forms and dripstones not previously described in the literature have been characterized, such as: crystalline splash-cups, equivalents of cave balloons composed of iron oxides, conical stalactites formed by corrosion of steel elements in subaquatic conditions or forms called here stalagmitites. Based on these observations, comments are presented on terminology used to describe dripstones formed in different environments. The introduction of the terms hypogeothem and anthropothem is proposed.
The article presents a simulation model of a conventional and pipe conveyors created in the Tecnomatix Plant Simulation environment. The main objective was to analyse the normal forces, throughput, and energy consumption of both types of conveyors. The model allows for variable input parameters and experimental comparisons. Four experiments were conducted as part of the research, changing the belt filling coefficient and the design characteristics of the idlers. The results showed that a conventional conveyor transports more material than a pipe conveyor with the same belt width. However, the higher productivity of the conventional conveyor is also associated with higher electricity consumption. Conversely, for the same amount of transported material, the conventional conveyor has slightly lower energy consumption compared to the pipe conveyor. The analysis also confirmed the stability of both systems during long-term simulation. The most significant impact on performance was the filling coefficient, which directly affected the amount of transported material. The results provide practical insights for optimising the design and operation of belt conveyors.
