Longwall conveyor systems study

final technical report as of 28 February 1978 by Albert J Herhal

Publisher: Dept. of Energy, Assistant Secretary for Energy Technology, Division of Fossil Fuel Extraction, Mining Research and Development, Publisher: for sale by the National Technical Information Service in [Washington], Springfield, Va

Written in English
Published: Downloads: 149
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Subjects:

  • Coal-handling machinery

Edition Notes

StatementAlbert J. Herhal, Robert A. Pimentel, William J. Douglas, Ketron inc.,
SeriesFE ; 8915/T 2-1
ContributionsPimentel, Robert A., joint author, Douglas, William J., joint author, Ketron, Inc, United States. Dept. of Energy. Mining Research and Development
The Physical Object
Paginationv. ;
ID Numbers
Open LibraryOL14878865M

  Modeling and simulation of longwall scraper conveyor considering operational faults Modeling and simulation of longwall scraper conveyor considering operational faults Cenacewicz, Krzysztof; Katunin, Andrzej The paper provides a description of analytical model of a longwall scraper conveyor, including its electrical, mechanical, measurement and control actuating systems. • Longwall production peaked in at nearly mm tons • Longwall systems declined between and - currently 50 systems operating – Likely reasons for decline • limited flexibility • large capital outlay/lack of customer commitment • regulatory issues Year Longwall Production Total Underground Production Longwall Production %. Main haulage generally can be accomplished using either a conveyor belt or mine cars. with longwall mining, face haulage is accoirplished using a chain conveyor that runs the full length of the longwall face. Section haulage involves a conveyor belt, and main haulage may utilize either a belt or track. 3. 1. Evolutionary Belt Conveyor Design - Optimizing Costs 2. Dynamics of Long Belt Conveyors with Distributed Drives 3. Applied Rubber Belt Cover Loss Prediction from Indentation 4. Belt Conveyor Idler Roll Behaviors •Part II. Solving Real Problems Using Numerical Analysis and Simulation 5. Simulation for Equipment Sizing, Longwall to Stockpile 6.

Belt Conveyor Capacity Table 1. Determine the surcharge angle of the material. The surcharge angle, on the average, will be 5 degrees to 15 degrees less than the angle of repose. (ex. 27° - 12° = 15°) 2. Determine the density of the material in pounds per cubic foot (lb/ft3). 3. Choose the idler shape. 4. Select a suitable conveyor belt. A Cat exclusive, CST Controlled Start Transmissions drive coal conveyors reliably and efficiency without putting excess demands on your power system. CSTs can be used with a variety of longwall conveyor equipment, including armored face conveyors. For moving soft to extremely hard coal, Cat plows get the job done like no other. Underground Mining Methods Handbook by W.A. Hustulid, Editor Society of Mining Engineers - Pages. General Mine Design Considerations. Starting around , mechanization was applied to this method. By , some referred to longwall mining as "the conveyor method" of mining, after the most prominent piece of machinery involved. Unlike earlier longwall mining, the use of a conveyor belt parallel to the coal face forced the face to be developed along a straight line. The only other machinery used was an electric cutter to.

point B. The conveyor is powered by a 3-phase AC motor, which is turned off and on by a manually controlled motor starter and includes, for fire protection, both short circuit and overload protection. The system requires an operator to stand at the motor starter, watching as the product reaches the entrance to the conveyor, and turning the. Get this from a library! Bulk material handling by conveyor belt 7. [M A Alspaugh;] -- "Thanks to breakthroughs in numerical analysis and simulation techniques, conveyor belt systems and component designs are evolving at unprecedented speed. Anyone responsible for designing or managing. Longwall Associates head and tail drives are unmatched in engineering prowess. Guaranteed to effectively and efficiently deliver coal to your stageloader while maximizing cutting speed and minimizing horsepower consumption, Longwall Associates head drives incorporate exclusive designs with the reliability you have come to expect from our company. You’ll Find the Right Cat® Equipment for the Job. Our assortment of Cat underground mining equipment includes: Shearers: Cat shearers are designed and built to provide superior driving and cutting force, while also featuring industry-leading automation that includes easy configuration for customized shearer operation. Plow systems: Cat plow systems are the leading choice for seams under ft.

Longwall conveyor systems study by Albert J Herhal Download PDF EPUB FB2

Book Description. In the past 13 years since the publication of Longwall Mining, 2 nd edition inalthough there have been no major changes in longwall mining technology and operations, many incremental developments in the whole system as well as various subsystems of the existing longwall mining operational technologies as detailed in the 2 nd edition have been added to.

Longwall Conveyor System Study. Volume I. Authors Herhal-AJ; Pimentel-RA; Douglas-WJ Source NTIS: Fe/t pages Link NIOSHTIC No. Abstract MISSING Publication Date.

With constant pressure for greater productivity, improving the performance of longwall systems remains a key goal for mine operators. At Caterpillar, all aspects of longwall operation and machinery are continuously reviewed to find ways to improve productivity and reduce the overall cost of mining.

The performance of the face conveyor system is. The paper presents a new approach of wall conveyor engines diagnosis. A wall conveyor is an essential device in coal mines. Its work is usually represented by three time series of current values of three conveyor engines.

The startup of the conveyor is the phase with the maximal observed load during its work by: 9. The longwall face is indicated by the number 8 in the diagram. Fig. Cutaway View of a Typical Longwall Mine In longwall mining, a panel of coal, typically around to metres wide, to metres long and 2 to 5 metres thick, is totally removed by longwall shearing machinery, which travels back and forth across the Size: 1MB.

Longwall mining is combined with R the main belt conveyor system via the This study concentrates on long-term incremental and sensitivity analysis to determine whether it is feasible to. Examples of synchronous conveyors are belt and roller conveyors; an example of an asynchronous conveyor is an automated electrified monorail or AEM.

Figure Bulk Belt Conveyor for Removal of Gold Mining Debris Figure Bulk Belt Conveyor for Removal of Wood Chips 7 Chapter Material Handling Systems Logistics Systems Design. Equipment General Longwall Equipment Suppliers.

Joy Mining Machinery Commercial website – illustrations of various types of mining equipment. INBYE – Mining Services - Nepean Group – a commercial website for assorted mining equipment. Commercial website for Elton Longwall – illustrations of various types of longwall equipment (includes plough and top coal caving supports).

Generally conveyor belts are supplied with electrical resistance in the anti-static range and should not be used for electrical insulation. Special non-conductive grades are available on request. There are four separate tables: Belts for Mining, Quarrying and General Service Heat Resistant belts Oil and Chemical Resistant grades.

Fossil Energy Study Guide: Coal Coal is the most plentiful fuel in the fossil family. The United States has more coal reserves than any other country in the world. In fact, one-fourth of all known coal in the world is in the United States, with large deposits located in 38 states. The United States has almost as.

Complete longwall systems from Komatsu represent the ultimate solution for high production longwall mining. Komatsu incorporates the best-of-breed shearers, roof supports, face conveyors, stageloaders, crushers and mobile belt tail pieces to deliver a complete longwall system that is in a class of its own.

Output productivity. Describes longwall mining and compares it with other underground mining methods. Describes major changes in the geologic, technological, and operating characteristics of longwall mining over the past decade.

Shows how changes lead to dramatic improvements in longwall mining productivity. References for technology and historical development. Scraper conveyors are one of the key machines forming part of mechanised longwall systems.

They are currently the only means of transporting the mined rock from longwalls in hard coal mines. Figure a. Classifications of longwall ventilation systems (e) Y-system; (f) double-Z system; (g) W-system.

(after McPherson, ). b) Room and pillar systems Figure shows the two methods of ventilating a room and pillar development panel in a coal mine where multiple entries are driven.

Figure a is the directional, or W-system, in which. Study and Design of Belt Conveyor System in Coal Mines has been written as a part of work and also to foster the use as a handbook for general applications in coal mines.

Mining Industry in India is a major economic activity as India is home to great reserves of sheet mica, iron ore and bauxite. @article{osti_, title = {New control strategies for longwall armored face conveyors}, author = {Broadfoot, A R and Betz, R E}, abstractNote = {This paper investigates a new control approach for longwall armored face conveyors (AFC`s) using variable-speed drives (VSD`s).

Traditionally, AFC`s have used fixed-speed or two-speed motors, with various mechanical solutions employed to try to. Longwall face 50m3/s 4. Conveyor Roadway 25m3/s 5. Pumping Stations & Sub-stations 25m3/s 6. Total air quantity requirement m3/s Fig Ventilation network model of Adriyala Longwall Project Considering the Ventilation Efficiency Quotient (VEQ) of about 85%, the total air quantity requirement for entire mine operations would be about m3/s.

Electronic books: Additional Physical Format: of armored flexible chain conveyor Coal transfer system Operation and maintenance of the armored flexible chain conveyor 9 Automation of longwall components and systems Definition Automation of three face machines Automation of longwall system The first modern longwall.

In respect to the data study and classification, conveyor belt with failure abundance of % is the most critical, while AFC with the failure abundance of % shows the best performance. The results of data analysis indicate that all three machines’ reliability distribution function obeys the power law process.

longwall mining Mining. a mining method in which very long rectangular blocks of coal are defined during the development stage of the mine and then extracted in a single continuous operation by an automated cutting head moving parallel to the coal the coal is cut, the working area is protected by a movable, powered roof support system.

As the face progresses, the immediate roof above. Ampcontrol’s conveyor monitoring systems help you manage conveyor safety and maximise productivity in underground and aboveground applications. Longwall Safety Systems Ampcontrol’s Longwall Safety System provides emergency stop, remote isolation and broadcast messaging to maintain safety while maximising production on longwalls.

The modern longwall mining method was first developed in the early s when the first shield supports were introduced. Since that time, all components of a longwall system have been considerably upgraded in areas such as installed power, conveyor chain speed and capacity, structural integrity, and — first and foremost — automation.

Sections of a powered roof support placed side by side form a set working in an underground excavation (a set of approximately sections on average). The powered roof support protects the mining machine and longwall conveyor and provides work safety for the crew. It also secures the roof space created by the shearer body.

Conveyor systems too small - get the biggest conveyor money can buy. Advance versus Retreat Longwall Most if not all longwalls are retreat Reserves are well-known.

Gateroads are easier to keep open - less support Development operation is totally separate from the longwall Sealing is easier if fire occurs Mine uphill, water runs downhill into.

Longwall Associates Incorporated, a Virginia based company, was established inmerging exceptionally talented engineers with world-class craftsmen to design and build Longwall Conveyors Systems for the underground extraction of minerals and rocks, particularly coal, utilizing the longwall.

@article{osti_, title = {Entry stability monitoring and analysis for longwall and continuous mining systems}, author = {Hart, W M and Chen, J S and Peng, S S and Holland, C T}, abstractNote = {Under a specific geological condition, roof supporting method, and pillar-entry system, an entry convergence concept may be the most effective means that can be used to effectively indicate the.

KEYWORDS: Conveyor belt, Power low process, Reliability-based maintenance, Total time on test plot. _____ 1. INTRODUCTION The conveyor belt is one of the widely used, interconnected transportation system in the today industry. Conveyor belt, which is a permanent means of transportation, has higher power and cargo transportation ability than the.

A compact drive system with integrated emergency operation, more than CST systems were sold between and worldwide. The Drive for Productivity With constant pressure for greater productivity, improving the performance of longwall systems remains a key goal for mine operators.

veyor systems. These programs are more comprehensive and include more extensive analysis and calculations than can be included in this manual. Although the programs are treated as proprietary information, each CEMA member company welcomes an opportunity to assist in the proper application of belt conveyor equipment.

One. Basic longwall mining principle simplified (retreating longwall in this case) A coal haulage system is installed across the face, on modern faces an "armoured face conveyor or AFC".

The roadways which form the sides of the block are referred to as "gate roads". belt conveyor is located, or in an area where mining equipment is being installed or removed, work shall cease and electrical power shall be de-energized in the affected area except intrinsically safe atmospheric monitoring systems (AMS).The objective of this study is to identify the impact of an inter-line conveyor on the throughput performance of manufacturing systems and determine the capacity of an inter-line conveyor to improvise productivity.

First, manufacturing system for an .face conveyors. And of course, Caterpillar – recognized as a world-leading developer and manufacturer of integrated longwall systems – has a long history of engineering solutions that meet the needs of mine operators.

That’s why our longwall systems have been in service in all major coal-mining regions of the world for decades.