Underground mine belt conveyor is mainly fire-prone areas, because of its sudden, rapid development, pose a threat to the underground workers, and even induced due to the spread of fire and gas explosion is possible. Result in a fire accident was caused by the ignition source has enough calories to make tape burn. Skidding accidents are a major factor in generating enough heat, tape slippage is due to loose or tape jam large load caused by the tape tensioning device due to loose tension force generated by the elastic elongation of the tape is too small and too large; large load First, because of heavy start, the second is due to load is too large, three is the tape and active roller, driven roller idler friction between too small, such as tape inside surface water or oil, the driven roller bearing damage or childcare roll damage; tape jammed tape is mainly buried in coal or in the mud, so that the tape can not run. Another electrical equipment sparks, electrical short circuit may also cause the conveyor fire.
1.2 belt run cause of the accident
Runtime Belt Conveyor deviation is the most common faults. Deviation accidents occur frequently, it will affect the life of the conveyor, severe outage occurs or is likely to result in personal injury or death. Causing belt run three main reasons: First, the device itself aspects, such as the outer cylindrical drum larger error, roller rotation is not flexible, proactive and driven roller drum axis parallelism error is larger, etc.; Second, installation and commissioning aspects, such as roller, roller, rack installation does not meet regulatory requirements, in addition to vent coal biased position of the mouth, causing the tape to make partial load deviation; Third, maintenance, mainly due to the cleaning is not timely, transport Machine Drum Machine roller-stained dust, resulting in local diameter Ambassador belt run.
1.3 Tear cause of the accident
Tear tape main reasons: First funnel badly worn, resulting in waste rock and coal gangue direct hit tape or card tape and other items caused by tearing; Second, serious deviation is scraped tear tape; three tape joint strength is too low or because the load is too large to make tape joints broken.
Prevention
2.1 Fire accident prevention
1) using fire-retardant tape, even in the event of fire, it will not be able to control the fire rapidly.
2) strengthen the maintenance of electrical equipment, to prevent fires caused by electrical accidents.
3) strengthen management, to keep the roadway clean, tape no floating coal, water, no oil, no debris, nose, tail no heap coals. Improve the quality of operation and maintenance personnel to maintain good running condition conveyor.
4) conveying confidential installation inspection and monitoring devices, such as drive rollers and driven roller temperature monitoring devices, smoke alarms and fire in the event of an automatic sprinkler system.
2.2 Deviation accident prevention
1) confirmation by the state purchase of qualified products, avoid the lack of precision equipment manufacturing belt deviation caused by an accident.
2) Install the installation process to focus on the dimensional accuracy:
a. installation tape found at the deviation in the drum, the drum should be corrected and equal degree of levelness, drive pulley, steering cylinder installation requires its width tape centerline coincides with the centerline of not more than 2mm, its axis line and tape The vertical center line of the drum is no more than a fraction of the width, the horizontal roller shaft of not more than 0.3/1000.
b. If you find that tape to the side of the no-load total deviation should be adjusted idler bracket.
c. If you find no deviation tape at no load, and heavy load to the side of the deviation, indicating that the tape appeared partial load, coal hopper vent should be adjusted to the position.
3) strengthening routine maintenance:
a. timely removal conveyor rollers, roller, splice at other major parts of the dust, and prevent the roller, roller-stained dust lead belt run.
b. timely adjustment of tape running deviation phenomenon occurs, promptly check the tape edges and joints wear, identify problems and timely replacement and repair.
4) Install belt run the monitoring device, once the belt run off the alarm signal to alert maintenance personnel to take action.
2.3 Tear accident prevention
A) timely repair worn funnel, avoiding direct coal gangue and pound the tape.
2) the timely processing of deviation fault, not tear tape.
3) Set the tape longitudinal tear monitoring devices, found fault timely manner.
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