Erdenet copper-molybdenum deposit is the biggest one in world and has a significant impact on Mongolian society economy. Today LIEBHERR-994B hydraulic shovels from Germany, electric including EKG-10 EKG-15 Russia operate for mining works, dump truck BelAZ - 75130 used transportation. The causes of shovel downtime are classified as technical, technological, organizational. During study period, 4...

Waterjet technology has been extensively used in machining processes since 1970’s, and in the last years it has evolved to a precision machining tool for micro workpieces, namely micro abrasive-waterjet blasting (μAWJB); nevertheless, as a finishing process to remove micro-burrs it has not been yet developed. Our experimental studies on low-pressure μAWJB showed that conventional nozzles which ...

During the construction of tunnel based on drilling and blasting method, a large amount wastewater will be produced, in which types concentrations main pollutants change regularly with continuous circulation process. In this paper, Hengwu drilling, post blasting, slag discharge initial support stages is sampled detected, pollutant laws each stage are analyzed, set pair analysis method used to e...

Underwater rock-plug blasting is a special technique for excavating underwater inlets. In the process of excavation, blasting-block movement from difference in water pressure inside and outside tunnel one key factors successful construction. Laboratory experiments were conducted using small explosive charges, high-speed camera was adopted to observe study block motion. Then, numerical simulatio...

The microseismic signals of coal and rock fractures collected by underground sensors contain masses blasting vibration generated mine blasting, the waveforms two are highly similar. In order to identify true with a monitoring system quickly accurately, this paper proposes lightweight network model that combines convolutional neural (CNN) transformer, named CCViT. Of these, CNN is used extract s...

This paper describes a new proof tool for deciding bit-vector problems in HOL4. The approach is based on “bit-blasting”, wherein word expressions are mapped into propositional formulas, which are then handed to a SAT solver. Significantly, the implementation uses the LCF approach, which means that the soundness of the tool is guaranteed by the soundness of HOL4’s logical kernel.

The long and large-diameter uncharged hole-boring (LLB) method is a cut-blasting used to reduce vibration induced by blasting. This typically involves creating an hole with 382 mm diameter drilling 50 m in the tunnel excavation direction at time. reported provide relatively good reduction high blasting efficiency through short compared traditional cut methods. In this study, advanced LLB incorp...

It is shown that when modeling a single interaction of an abrasive particle with the surface part in process collision under air (liquid) pressure, it necessary to take into account specifics impact-abrasive wear, separation wear preceded by metal destruction. In schematization contact during blasting, some commonality shot blasting and number assumptions typical for grinding, micro cutting gra...

This study concerns the determination of the significant factors for an innovative deburring process: low pressure abrasive water-jet blasting. We firstly classify the abrasive medium aluminum oxide (Al2O3) according to the individual characteristics of different grain sizes. Then, the particle behavior in the air jet is analyzed with an optical measuring method, Particle Image Velocimetry (PIV...

This paper provides preliminary data on the use of three different mechanical procedures to remove lichen Diploschistes scruposus and a gypsum black crust from an ornamental granite. The methods used were wet sandblasting (Hydrogommage®), dry (IBIX®) dry-ice blasting. In addition, lichens also removed by scraping with scalpel. cleaning efficacy undesirable effects granite evaluated stereomicros...