The document describes a microprocessor-based autonomous control system developed for longwall coal mining shearers. The system aims to control the load on the cutter motor by regulating the haulage speed of the shearer. It does this by continuously monitoring sensors that measure current, voltage, power, and speed, and using a programmed algorithm to adjust the variable speed drive controlling the haulage motor as needed to prevent overloading. The system was tested through field investigations and laboratory experiments.
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This presentation by Roger Lembit of Gingra Ecological Surveys highlights the role of long term monitoring of fire impacts and plant response in guiding restoration strategies by discussing vegetation recovery at the State Mine Fire site.
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Longwall; Longwall in coal; Longwall in Hard Rock; Sublevel Caving; Characteristics of the ore body and mining method; Development; Production; Equipments Used; Block Caving, Introduction, Historical evolution of the method, Condition deposit; Principles of the method; Methodology of block caving; Basic issues of geomechanical to the black caving method; Caveability;Mine design Block caving; Fragmentation and extraction control; Subsidence associated; Advantages and Disadvantages of Block Caving
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This presentation is on vocational training that I have done between 12 july to 1 august, in BHEL BHOPAL I visited all the blocks and our training was sheduled to WTM block and traction motor block.
This is to declare that this is a compiled presentation made from the materials available in public domain on Internet irrespective of the exclusive references in each and every slide given or missed.
1. INCARF Microprocessor Based Autonomous Control System of Longwall Coal Mining Shearer By: - Rajesh P. Barnwal , L.K. Bandyopadhyay, Gautam Banerjee et.al. Council of Scientific & Industrial Research E-mail: r_barnwal@yahoo.com
9. Shearer Specifications Specifications of the Shearer Seetalpur Colliery Moonidih Colliery Dhemomain Colliery VK-7 Incline Pathekhera Colliery Make ASL AB –16 ASL AB –16 EICKHOFF EDW 300/380 ASL AM 500 ASL AB -16 Motor Specification 550 V 150 KW 1440 rpm 1100 V 200 KW 1470 rpm 1050 V 380 KW 1470 rpm 1050 V 500 Hp 1470 rpm 550 V 200 KW 1470 rpm Drum Diameter (m) 1.47 1.4 1.6 1.65 1.2 Drum rpm 45 45 45 35 & 45 45 Average web depth (m) 0.4 0.6 0.55 0.4 0.5
10. Continuous Power Recording Fig.: Continuous recording of power at Seetalpur Colliery Haulage Speed: 5.18 m/min. Scale: 0 - 200 Kw Chart Speed: 3 m/hr Fig.: Continuous recording of power at VK7 Colliery. Haulage Speed: 2.5 m/min. Scale: 0 - 400 Kw Chart Speed: 6 m/hr
14. System Description T1 -Current Transducer for Cutter Motor T2 -Voltage Transducer for Cutter Motor T3 -Current Transducer for Haulage Motor T4 -Techo Sensor for RPM of Haulage Motor T5 -Sensor for O/p frequency of the Variable Speed AC Drive T6 -Sensor for O/p Voltage of the Variable Speed Drive Block Diagram of the Designed Control System MICROPROCESSOR REGULATED DC VOLTAGE SUPPLY CUTTER MOTOR CUTTING DRUM FIRING & TIMING CIRCUIT VARIABLE SPEED DRIVE DAC DISPLAY UNIT LOAD HAULAGE MOTOR T3 T5 T6 T4 T2 T1 12V 5V -12V 1100 V ADC
15. Block diagram of Laboratory Experimental Setup T1 -Current Transducer for Cutter Motor T2 -Voltage Transducer for Cutter Motor T3 -Current Transducer for Haulage Motor T4 -Techo Sensor for RPM of Haulage Motor T5 -Sensor for O/p frequency of the Variable Speed AC Drive T6 -Sensor for O/p Voltage of the Variable Speed Drive Block Diagram of the Developed Control System MICROPROCESSOR REGULATED DC VOLTAGE SUPPLY COMPUTER PC PRINTER FIRING & TIMING CIRCUIT VARIABLE SPEED DRIVE DISPLAY UNIT LOAD HAULAGE MOTOR T3 T5 T6 T4 12V 5V -12V 440 V ADC DAC PLOTTER
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21. Flowchart The Control Algorithm for the Cutting operation of the Shearer (Actual Operation) CS - Control Signal to the Drive S1 - Small increment in the CS S2 - Small decrement in the CS SSmin -Minimum Haulage Motor Speed SSmax -Maximum Haulage Motor Speed IHmax -Maximum Haulage Current IH - Haulage Motor Current IC - Cutter Motor Current V - Input Voltage to the Drive W - Input power of the Drive SS - Haulage Motor Speed CSH - Control Signal to stop the haulage motor FLIH -Full load Haulage Motor Current FLIC -Full load Cutter Motor Current IC - Cutter motor current 1 CS = CS + S1 OUT CS TO DRIVE HAULAGE DELAY INPUT IH, IC, V, W, SS OUTPUT IH, IC, V, W DISPLAY IS IH > FLIH IS IH > IHMAX IS IC < FLIC IS SS < SSMAX OUT CSH NO YES YES YES NO NO CS = CS - S2 STOP MOTOR YES IS SS < SSMIN STOP MOTOR NO NO YES INPUT CONST. CS, S1, S2