Nigeria is rich is solid mineral resources, such as: Kaolin, gypsum, mica, clay, tantalite, iron ore, gemstone, silica sand.
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Recycling concrete &building rubble is not only able to bring profit to investors, but also good for environment protection.
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By absorbing the advanced technology from the world, we researched and designed PF series impact crusher.…
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Base on the plentiful experience of producing and marketing of impact crusher, Sofol R&D institution…
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Adopting technology from the world, PY Series spring cone crusher has an excellent performance in secondary…
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The vibrating screen is a kind of sieving equipment of international advanced level, developed by our…
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Sofol VSI Series vertical shaft impact crusher is designed by reputed German expert of Sofol and every…
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For this purpose, extensive investigations on the crushing behavior of granular materials have been carried out using various experimental approaches, including single-particle crushing tests [10], [15], triaxial shear tests [16], [17], and creep tests [18], [19].Although the particle crushing characteristics and their correlation with the mechanical behavior can be …
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Coal seam drilling is a simple, economical, and effective measure commonly used to prevent and control rock burst. Following rock burst, coal exhibits significant dynamic characteristics under high strain-rate loading. Our purpose was to determine the physical processes associated with impact damage to drilled coal rock, and its mitigation mechanism. …
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iv. Reverse Circulation Drilling: This method circulates drilling fluids to collect rock cuttings. v. Directional Drilling: Directional drilling is the practice of drilling non-vertical bores. vi. …
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In general, the drilling process is intricate, involving numerous aspects. Owing to the heterogeneity inherent in fiber-reinforced composites, occurrences such as matrix cracking, layer separation, burr formation, and other forms of damage in the hole-making process are prone to manifest [28, 30].Simulation methods often struggle to accurately replicate these complexities.
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Crushing of rocks in Zaboy. 2. Remove crushed rock (sludge) from the bottom release ... Depending on the method of mechanical drilling, drilling or special tools (drill cup, spoon or screw drill, auger, column). 4. Two of the above methods in the combined method or three are used simultaneously or sequentially.
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Rapid and partial acquisition are features of rock drilling for obtaining rock properties. Most previous research has primarily concentrated on how to quickly obtain rock mechanics parameters, with limited emphasis on extracting rock parameter fields, particularly in three dimensions. This study attempted to develop a numerical integrated method to extract …
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Mechanical properties of all the three rock types were measured at laboratory following the suggested standard methods by International Society of Rock Mechanics (ISRM) and tabulated in Table 1. Fig. 11, Fig. 12, Fig. 13 show the plots of drilling specific energy ( ε = F t / A ) versus drilling strength ( ζ = F n / A ) data.
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A novel method is developed for characterizing the mechanical response and failure mechanism of brittle rocks under dynamic compression-shear loading: an inclined cylinder specimen using a ...
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This Technical Brief outlines simple, low-cost drilling methods which may be used in various situations. Each can be used and maintained easily. Drilling constraints Whatever drilling method is used, there are several ... With a mechanical winch, depths of hundreds of metres can be reached. Method: The cutting tool (known as the auger head) is
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The article describes a human-machine tool shop management system for the motor industry, which is based on the developed models and algorithms of production division management tasks.
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Mathematical Problems in Engineering. This content is subject to copyright. Terms and conditions apply.. Download
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However, the traditional concrete crushing methods, ranging from mechanical crushing to blasting, have many common defects, namely, high cost, long duration and low efficiency. ... The direct discharging method. 2.4 Comparison between the three methods ... summed up the principles and methods of rock crushing and drilling by low-temperature ...
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Contribute to brblmd/sbm development by creating an account on GitHub.
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1. Primary crushing equipment. Primary crushing is the first stage of the stone crushing process. At this stage, raw materials extracted through blasting or mining are …
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Abdulaziz et al. (2021) introduced a 3DMEM geomechanical model to analyze the effect of formation mechanical properties on borehole walls. Nevertheless, optimizing the drilling trajectory and adjusting the mud pressure is the primary current method for minimizing the effects of heterogeneity on the wellbore (Xu et al., 2023). Hence, it is ...
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Comparing the three crushing technologies, the fuse explosion method needs to replace the wire frequently, and the electrode may be easily eroded by wire gasification, which will affect the subsequent discharge effect. The direct discharge crushing method requires a high voltage, the volume, weight and cost of the equipment are relatively high.
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This action breaks the materials into smaller fragments that are easier for further processing. The jaw crusher's working principle is based on the reciprocatory movement of the …
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DOI: 10.1016/J.IJRMMS.2019.03.010 Corpus ID: 133754444; An empirical method for determining the mechanical properties of jointed rock mass using drilling energy @article{He2019AnEM, title={An empirical method for determining the mechanical properties of jointed rock mass using drilling energy}, author={Ming-ming He and Ning Li and Zhi-qiang …
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The most common mechanical injuries are cutting and tearing, shearing, crushing, breaking, straining, spraining, and puncturing. Explain the concept of safeguarding. Safeguarding involves devices or methods that minimize the risk of accidents resulting from machine-operator contact.
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The results demonstrate that the degradation of dynamic mechanical properties mainly occurs in the first four thermal cycles; with the increase of damage factor, the stress decreases linearly under the three cooling methods, and the damage caused by liquid nitrogen cooling to granite is the most significant, followed by water cooling.
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A systematic understanding of the physical and mechanical behavior of high-temperature rocks after different cooling methods can provide a theoretical basis for underground coal gasification and geothermal resource exploitation. In this study, a series of tests were carried out, including wave velocity and split Hopkinson pressure bar (SHPB) test, to analyze the …
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Franca [10] established a drill-rock interaction model and analysed the relationship between impact action and rock crushing by quantitatively obtaining data on the mechanical properties of rocks ...
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The patent relates to the technical field of tunnel construction, in particular to a construction method for breaking an underground excavation tunnel advance disassembly machine, which comprises the following steps: s1: construction preparation; s2: lofting; s3: drilling split holes; s4: blasting and crushing; s5: checking undermining; s6: performing primary support, adopting …
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What happens with this method is the hard drive is put through a machine that is subject to a blow strong enough that it breaks through the chamber that encases the physical hard drive. This method could be enticing for the simple fact that …
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A mechanical emergency crushing and drilling device is characterized by comprising a base plate, an oil tank, a mounting support, two hydraulic driving cylinders, a driving motor, a rotating bearing, a power telpic cylinder, a spiral rotating shaft, a spiral cutting blade and a drill bit. The spiral rotating shaft is positioned at the most front end of the device, the drill bit is fixed to ...
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Drilling into deep formation characterized by high formation and hydrostatic pressures often brings great challenges to oil and gas industry and the phenomena, such as bit slip, balling and cutter wear, are easy to be exposed. Therefore, it is very important to conduct rock-breaking experiments under high confining and hydrostatic pressures and understand the …
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The entire chamber is utilized for crushing. The rocks falls/slides through the chamber until they are crushed directly between the concave and mantle. The rocks are crushed in one strike which yields big forces. Most of the crushing in the lower part of the chamber Mis-aligned feed and …
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Conventional mine shaft sinking methods involve the performance of a cycle of different operations—drilling and blasting, removal of smoke and cleaning of fly-rock lodged on overhead timbers, mucking and hoisting of the broken rock, and timbering. The latter (a) may be the last operation of the cycle, (b) may be carried on during drilling and mucking, provided it is …
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You can use both mechanical and laser methods of PCB drilling to create vias. What you choose depends on your situation. Laser drilling offers you more control over the diameter and is more efficient but gives you less depth control. Mechanical drilling has better depth, but you sace the ability to make very small vias and some efficiency.
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Particle crushing is an important factor affecting the mechanical characteristics of calcareous sand, but at present, most of relative studying methods rely on physical experiments. ... to simulate the calcareous sand particles, and the fragment replacement method (FRM) is used to simulate the particle crushing. The three-dimensional discrete ...
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PE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
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