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A, reason

1.1 the cause of the fire accident

Mine belt conveyor is a major fire area, mine because of its sudden, development is rapid, pose a threat to the underground staff, even has the possibility of gas explosion induced with the expansion of the fire. The cause of the fire accident is with enough heat source for tape. Sliding accident is the main factor to produce enough quantity of heat, skid is due to tape loose, large load or tape card resistance, adhesive tape is loose the tensioning force generated in the tension device is too small and tape elastic elongation is too big; Larger load is due to overloading starting, the other is due to the load is too large, 3 it is tape and active roller, driven mixing mill roller is too small, the friction between the inner surface with water or oil, such as tape driven roller bearing damage or roller damage; Tape card resistance mainly tape buried in mud or in coal, the tape can not run. Other electrical equipment loss of blasting, wire short circuit may also cause conveyor fire.

Belt run-out in 1.2 the cause of the accident

Belt run-out in belt conveyer runs is the most common fault. Accident happen often run, affect the service life of the conveyor, serious downtime will happen accident or has the potential to cause loss of life. Causes of rubber belt run-out in three main areas: one is the equipment itself, such as drum of cylindricity error is bigger, the cylindrical roller rotation is not flexible, the axis of the driving roller and the driven roller parallelism error, etc.; Second, the installation and debugging, such as roller, roller, frame installation does not conform to the requirements of the specification, in addition to the location of the discharge port coal deviation, cause belt partial load to run; Third, maintenance, is mainly due to the cleaning not in time, conveyor mixing mill roller is stained with dust, cause local variable diameter ambassador belt running deviation.

1.3 tear the cause of the accident

Tape tearing of the main reasons: one is the funnel serious wear and tear, and the waste rock and coal direct hit a tape or gangue and other items of CARDS tape tear; 2 it is blown rubber belt serious run apart; 3 it is tape joint strength is too low or too ambassador for load tape joint fracture.

Second, the prevention of

2.1 the prevention of fire accident

1) using flame retardant adhesive tape, even if there is a fire, can also control the fire from developing rapidly.

2) strengthen the electrical equipment maintenance, prevent fire caused by electrical accident.

3) to strengthen management and keep the roadway clean, tape on no float coal, no water, no oil, without sundry, the nose, tail without a heap of coal. To improve the quality of the operating and maintenance personnel, to keep the good operation of the conveyor.

4) transmission of confidential installation detection monitoring device, such as drive roller and the driven roller temperature monitoring device, smoke alarm device and in the event of fire sprinkler system.

2.2 wandering the prevention of the accident

1) purchase confirmation of qualified products by the state, to avoid the equipment manufacture precision insufficient belt running deviation caused by the accident.

2) the installation process should pay attention to the installation size precision:

A. belt in the roller run in found in the installation and debugging, should the levelness of the correction roller and equal degrees, drive roller, steering cylinder centerline and the installation requirements of its width tape line contact ratio less than 2 mm, its axis and the verticality in the midline in the area of the adhesive tape is not more than two over one thousand the width of roller drum shaft the levelness of not more than 0.3/1000.

B. if it is found that adhesive tape in always to one side when no-load running deviation, roller bracket should be adjusted.

C. if it is found that adhesive tape don't wandering in light, and overloading to one side when wandering, tape a partial load, the location of the coal hopper should be adjusted.

3) strengthen the routine maintenance:

A. keep clear conveyor roller, roller, the material of main parts such as coal dust, prevent caused by roller, roller is stained with dust on belt running deviation.

B. adjust tape in phenomenon occurred in the operation of the wandering, timely check tape edge and wear and tear on joints, replacement and repair in time when problems found.

4) installation of rubber belt run-out in monitoring device, once belt running deviation, signal alarm, remind maintenance personnel to take measures.

2.3 tear accident prevention

1) timely repair has worn funnel, avoid waste rock and coal direct hit to the tape.

2) running deviation fault timely treatment, in order to avoid tear tape.

3) set the belt longitudinal tearing monitoring devices, found that the fault handling in a timely manner.