Intelligent service of reducers of mining machines

Currently, large machine building companies produce hydraulic excavators serially with a wide range of operating parameters (bucket capacity, digging radius, digging depth and height). Hydraulic excavators have found wide application in quarries all over the world (USA, France, England, Japan, Australia, Russian Federation etc.). A sufficiently wide range of backhoe capabilities for the formation of various forms of surface workings and bench slopes allows them to work without leaving various prisms of coal losses in the coal seam's bottom, at the optimum height of the excavated layer. The most efficient way is to work off the bench by hydraulic backhoe by downward digging and bottom loading. The depth of digging (the height of the face) is approximately equal to the height of the body of a dump truck. The minimum value of the excavation cycle is achieved when the dump truck is positioned at an angle of 35-60° to the axis of the excavator. To reduce the time for installing a dump truck for loading, an end-to-end truck approach scheme is recommended, but the duration of the excavation cycle is increased as a result of increasing the angle of the excavator during loading. The research shows that: (1) at the excavated layer's height of 5.0 m, additional coal losses due to nonscooping is not formed only for seam's angle of 50 or more, except when using hydraulic backhoes with large operating parameters; (2) for excavated layer's height of 4.0 m, the minimal coal losses will be achieved for dip angle of at least 40 degrees, and for long-boom excavatorsnot less than 30°; (3) the excavated layer's height of 3.0 m makes it possible to virtually eliminate coal losses, except for excavators with a short boom.

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“…Economic advantages of open pit mining [4][5][6] inspire rapid development of various excavation equipment [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Defining the Excavated Layerrs Height for Coal Extraction by Backhoes

Litvin¹,

Tyulenev²,

Zhironkin³

et al. 2018

Proceedings of the 9th China-Russia Symposium “Coal in the 21st Century: Mining, Intelligent Equipment and Environment Protecti

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Simulation and Field Measurements of Reliability Parameters of Dump Truck Hydraulic System

2018

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Abstract. Paper studies the problem of non-failure operation of dump trucks hydraulic system that is exploited in the climatic conditions of Kuzbass region. The main characteristic of the Kuzbass climate is hardly continental, so, it has sharp fluctuations in ambient temperature for seasons, for a month or even a day. To analyze the negative factors affecting the operation of the dump trucks hydraulic system a systematic approach was used, based on the methodology of SADT structural analysis. The result of field and cameral researches identified that the major negative factor is instability of kinematic viscosity of working fluids used in the hydraulic system of mining dump trucks over a wide range of ambient temperatures. There were offered the further ways for methods to stabilize the parameters of working fluids in the hydraulic system of dump trucks.

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Intelligent service of reducers of mining machines

Cited by 2 publications

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Defining the Excavated Layerrs Height for Coal Extraction by Backhoes

Defining the Excavated Layerrs Height for Coal Extraction by Backhoes

Simulation and Field Measurements of Reliability Parameters of Dump Truck Hydraulic System

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