Горный журнал УГГУ - Результаты поиска для: Demchenko I. I

The production of sized coal directly at the face of an open pit in the cyclical mining technology involves the introduction of a processing unit and the addition of a transport unit with a technological vehicle with specialized containers installed on it. The processing unit, at the outlet from which the sized coal is produced, includes crushing and sorting plants, a storage bunker, and conveyor lines. Technological vehicle is designed for transportation of specialized containers with the produced sized coal from the face to the daylight surface. The use of containers for the delivery of sized coal will ensure the safety of its qualitative and quantitative characteristics. The structure and the parameters of the introduced mining and transport complex depend on the specific mining-engineering conditions of the development and the possibility of using the equipment offered by the industry in these conditions. In the paper, various variants of technological schemes for placing the complex of mining and transport equipment in the face of an open pit are considered. The possibility of allocation and the field of application of the complex of processing equipment in mining-engineering conditions of face development with an excavator ECG-5A has been determined.

A new way of dust suppression in open pits is suggested, based on water pulverization from pressure pipelines of water drainage facilities. The elements of the dust suppression system have been examined, which are located along open pit automobile roads. The article introduces the methods of detecting pressure characteristic of water drainage facility with track water intake for dust prevention. Calculation of possible parameters of water drainage combined with the suggested moistening system operation is fulfilled. On the basis of the obtained performance figures some recommendations on the pumps selection are stated for open pit water drainage facilities with track consumption water flow rate in the areas of roads moistening; conditions of these facilities rational use are also justified. It is shown, that capacity overstock of a pump station under normal water inflows piping out to the open pit is an important factor for water drainage facilities effective use to reduce air dust content.

The results of technical diagnostics of mining equipment on the cuts and quarries in the Krasnoyarsk region are shown. The prospects of high-diagnosing systems in actual use of technology are being discussed.

Thursday, 06 August 2015 05:21

About effective use of coal storage spaces

The estimation of different ways of storage of coal products, with account of rational use of storage spaces was given.

For sorting of coal a screen with a cable moving field was proposed and a description of its work was given. Due to the simplicity of the design is possible to obtain high-quality coal with less energy consumption and weight and size screen compared to the currently used ones. The formulas for calculation of the main parameters of screen are presented. The basic parameters affecting the performance: width and speed of the cable were designed and optimally correlated. For low performance of 50–250 m3/h the recommended speed is 0.15–0.63 m/s and screen width of 0.5–1 m; for the average performance of 250–550 m3/h the speed of 0.15–0.73 m/s is set and the width of the screen 0.7–1.6 m; for high performance 550–900 m3/h or more, the speed of 0.15–0.75 m/s and the width of the screen 0.9–2 m are established. In addition, related ratio of length and width of the outlet of the loading bunker, diameters of cables and drums, mass of screening sections were obtained. Ranges of speeds of the cable and the width for a given performance are specified.

Wednesday, 25 February 2015 10:14

Classification of mining and processing machinery

Classification of mining machinery for the extraction and processing of coal was suggested. Classifications are presented in tabular form, in the first column of which is the basic classification feature, and also features of working, navigating and power equipment. In the classification models of produced and prospective mining machines, scheduled for release, as well as discontinued products are given. Mining equipment is cyclic excavators and continuous action excavators, transporting machines - loaders and bulldozers, processing equipment - screens and classifiers. The proposed classifications allow a visual assessment of the parameters considered for the study of mining machinery mining facilities for the extraction and processing of coal to produce high-quality coal products.

Signals are registered from diffracted ultrasonic waves in water and steel at the propagation of ultrasonic pulses in a direction perpendicular or near to this direction. This allows the use of a method for determining the local internal stress, in which the ultrasonic transit time is measured between the two inner regions of the sample that are in the focal plane of a single acoustic lens, using two piezoelectric transducers located in the focal plane of the other acoustic lens. The speed of ultrasound is the value of the local internal stress in the sample. This result will be the basis of ultrasonic measurement unit inside local stresses in load-bearing sites of mining machines.

Efficient operation of the fuel and energy complex of the country largely depends on the transport and storage of solid fuels. One solution to this issue can be shipping and storage of coal in specialized containers. Peculiarities of transportation and storage of high-quality coal and briquettes in specialized containers have been described in numerous studies, but the technology of coal loading has been considered in enough detail. This work describes the technology of loading coal at coal-loading complex of a mining enterprise into specialized containers of various loading capacity depending on customer requirements and consumption volumes. A method of calculating the time of loading has been worked out. The calculations allow us to estimate the time of loading in specialized containers, depending on the weight of the loaded coal. Transportation of coal (especially of sized coal and briquettes) in special containers to different groups of consumers will help to preserve the quality of the fuel, to deliver it to consumers without loss and environmental pollution and to reduce the time of transfer from one mode of transport to another.