DRILL & BLAST
litres/min at up to 92 bar. Te entire contract also includes a service and spares package as well to ensure continued reliable service.
The future In 2012, the Russian government
approved a long-term investment plan
for the coal industry, with $123 billion to be invested over the next 17 years. Tis is deemed necessary to meet the future requirements for coal which is used to generate 25% of the electricity requirement in Russia. Coal production from the underground mines is expected to increase by nearly 50% over the next 20 years.
Optical encoders for hazardous areas
RMI has delivered three Trimax S300 pumps to power the roof support system as well as two Trimax S300 pumps for the water pumping system
Te Kopex group, a supplier of mining equipment and tecÚology, is delivering a turnkey solution for the Vladimirskaya longwall coal mine in Russia. Part of this project is the powered roof support system to be installed at the coalface itself. Kopex has awarded the supply of the critical pumping systems to RMI Pressure Systems Ltd, Manchester, UK.
The power source Te roof support systems require a
power source and this takes the form of a sophisticated hydraulic pump capable of producing extremely high pressures. Te
09 INTERNATIONAL MINING ENGINEER
reliability of these pumps must also be beyond any doubt and bench testing has to be carried out for thousands of hours to ensure their operation in the mine will be faultless. In this case, Kopex has selected RMI Pressure Systems, which has a proven track record in the mining industry and has considerable experience in supplying equipment for the longwall mining operation. RMI has delivered three Trimax S300 pumps to power the roof support system, each capable of providing 244 litres/min at up to 353 bar, as well as two of Trimax S300 pumps for the water pumping system, which are cable of providing 319
Tanks to a newly developed housing with Ex ‘d’ flameproof enclosure protection, optical encoders from Posital are now also suitable for installation in explosive gas and dust atmospheres. Certified for ATEX groups I and II, the encoders can be used in many applications, such as underground mining machines, oil refineries, chemical plants, grain handling facilities, and printing presses. Available with a wide range of fieldbus or Ethernet interfaces, the encoders offer many mechanical options: users can choose between blind hollow and solid shaft versions, various flange types and connection options. Optionally, Posital also provides stainless steel (316 AISI) models. Te encoders use a proven opto-electronic scanning method that ensures interference-free measurement. Te single-turn sensor provides a resolution of 16 bits per revolution.
In addition, a maximum of 16,384 revolutions (14 bits) can be measured in multi-turn mode, thereby covering a measuring range of 30 bits. Like all optical Posital encoders, they do not require backup batteries or referencing – they instantly provide current, absolute position and revolution values even after power loss.
Posital now provides absolute encoders for use in hazardous areas.
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46