— Abstract. Intensive coal mining activities in the Upper Silesian Coal Basin (USCB) in southern Poland are resulting in large amounts of methane (CH4) emissions. Annual CH4 emissions reached 448 kt according to the European Pollutant Release and Transfer Register (E-PRTR, 2017). As a CH4 emission hotspot in Europe, it is of …

 — The constant air quantity β is mainly dependent on the ore handling system and, to a certain extent, on the overall mine production rate. For mines where rock is transported through a decline using diesel powered truck haulage or there is no crushing of the mined rock, a suitable value of β is 50 m 3 /s. This typically increases to 100 m 3 /s …

 — In the longwall mining method, mine development is carried out in such a manner that large blocks of coal, usually 100 to 300 metres wide and 1,000 to 3,000 metres long, are available for complete extraction (see photograph).A block of coal is extracted in slices, the dimensions of which are fixed by the height of coal extracted, the width of the …

 — Longwall top coal caving (LTCC) is a special type of mining method commonly used to extract coal seams thicker than 4.5 m (Wang et al., 2018). Originating in France …

The maximum range of speed control of about 3 : 1 will be available depending on the load. This method of speed control is most economical for constant torque drives. This method of speed control is employed chiefly for dc series motors driving cranes, hoists, trains etc. because such drives operate on intermittent duty.

 — The critical temperature theory of spontaneous combustion of coal and the numerical simulation method are used to explore the minimum secure speed of fully mechanized coal face to prevent the spontaneous combustion in goaf. Combined with the actual situation of workface 31005 in a coal mine, the highest temperatures in goaf at …

 — This article describes methods of methane drainage during mining used in Polish coal mines. The first method involves drilling boreholes from tailgate roadway to an unstressed zone in roof or ...

 — Mining techniques can be divided into two common excavation types: surface mining and sub-surface (underground) mining (Hartman & Mutmansky, 2002).The major …

List of equipment used in opencast coal mining are: 1. Bulldozer 2. Craper 3. Ripper 4. Tractor Shovel 5. Dipper Shovel 6. Stripper Shovel 7. Pull Shovel or Hoe 8. Dumpers or Tippers 9. Drag Line 10. Road Grader 11. Rock Drills. Opencast mining is the oldest method of excavating minerals but the mining operations have been mechanised by the …

 — ABS and traction control systems use an electronic control unit and machine sensors to monitor wheel speed and brake-line pressures. When wheel lock-up or wheel slip conditions exist, the control unit's algorithms determine what electric current is needed at the electrohydraulic control valves to improve the operator's control of the ...

 — According to the speed requirement of the intelligent sorting system of coal gangue, the system can quickly reach the predetermined speed value, and effectively eliminate the shaking phenomenon in ...

 — Many mines have introduced the tunnel boring machine (TBM) to improve the efficiency of rock tunneling because of its high propulsion capacity, safe working space, and intelligent equipment.

 — 1. Introduction. Coalbed methane, commonly called "gas", is generated during the formation of coal (Liu and Harpalani, 2013), and is stored in coal seam (Clarkson and McGovern, 2005, Pan and Connell, 2012).It is a clean and efficient energy source (Flores, 1998).However, abnormal gas emission is the most important factor that leads to gas …

 — In [10], an optimal switching control strategy and an optimal variable speed control strategy for the BC are proposed and compared, where the time-of-use tariff, ramp rate of belt speed, and other system constraints are considered. The simulation results of these two strategies show that the optimal variable speed control can further reduce the ...

 — It's important to determine whether there are specific limitations or preferences for coal mine applications. Firstly, let's explore the three speed control methods for underground mining locomotives: 1. Resistor Speed Control: This method adjusts the speed by changing the resistance value, resulting in stepped speed control.

 — Fig- Ward Leonard method of speed control for a DC shunt motor. In the above system, M is the main DC motor whose speed is to be controlled, and G is a separately excited DC generator. The generator G is driven by a 3-phase driving motor, which may be an induction motor or a synchronous motor. The combination of an AC …

injuries in the underground coal mine,1,2 main causes of mining equipment accidents,3,4 research of underground mine working environment parameters and ventilation,5,6 location of control devices in underground mines,7 useful methods for ensuring mining safety,8 research of voice communication systems,9,10 human factors elements in

This paper examines the relationship between the advancement of the working face and the distribution of spontaneous coal combustion under a low air leakage wind speed in a goaf. Based on the unsteady state simulation method, the process of spontaneous coal combustion was simulated in a fully mechanized coal mining face at different advancing …

 — In the process of coal mine drilling, controlling the rotary speed is important as it determines the efficiency and safety of drilling. In this paper, a linear extended state …

Impact Factor Value 4.046 e-ISSN: 2456-3463 International Journal of Innovations in Engineering and Science, Vol. 3, No.7, 2018 68 Safety Management In …

 — In view of the above problems, the research on variable speed control of the BC has become a hotspot. The variable speed control is a method of adjusting the belt speed to save the power consumption of the BC [6]. Through the coordination of belt speed and feed rate, the full load operation status of the BC can be realized.

 — **The method and traction is by hydraulic transmission for improved operative control during tramming. In the case of electric shuttle cars, the tramming motors give better low speed control; however, it requires a high degree of maintenance supervision *** Weight includes battery weight.

 — Schematic diagram of the emulsion pump station supply and configuration system for the coal mining face. 1- Filter; 2- Pump; 3- Motor; 4- Safety valve; 5-Check valve; 6- Accumulator; 7- Unloading ...

 — In [9], an energy calculation model of the BC used for speed control has been established, which provides a model foundation for the optimization control of the …

 — Design of control and frequency conversion speed regulation system for mine fan. Hong-kui Zhang 1,2, Qiu-lin Zhang 1,2, Wang Zhe 1,2, De-peng Zhang 1,2 and Ming Wang 3. Published under licence by IOP Publishing Ltd Journal of Physics: Conference Series, Volume 1653, The 2020 International Conference on Advanced Materials and …

Liquid Controller for Induction motor Speed Control System. Cascade Speed Control Method [4] is used in some mines in winder drive. Here, two induction motors are coupled mechanically. First motor of the wound rotor type is connected to normal three phase supply and the second motor's stator gets supply from first one's rotor.

150hp man riding hauler applications in coal mines. haulers speed control method in coal mines. Colliery Equipments Used in Mines With Diagram. Jul 20 2022 · Speed Control in Haulage It has been found that the most cutter loaders embody a system of control which enables the haulage speed to adjust itself to accommodate changes in load on the ...

DOI: 10.1117/1.JEI.31.2.023032 Corpus ID: 248313205; Obstacle detection method of unmanned electric locomotive in coal mine based on YOLOv3-4L @article{Wang2022ObstacleDM, title={Obstacle detection method of unmanned electric locomotive in coal mine based on YOLOv3-4L}, author={Wenshan Wang and Shuang …

As with many surface mines in Australia, the traffic control methods used along haulage routes differ from those used on public roadways. For example, instead of STOP or GIVE WAY signs posted at intersections as one might encounter on a standard thoroughfare, the site manages in-pit traffic flow through a hierarchical system based on vehicle ...

 — To show the relation among different variables, the dynamic response of the important coal mill variables for a vertical roller medium speed mill during start-up, shutdown, steady state, and load change condition, is provided in Fig. 3.The real time per minute data is collected from Vadinar Power Corporation Limited (VPCL), a captive …