Replace the roller bearing hazard source identification

1)Hazard source: no empty belt before stopping.
Description of risk and its consequences: easy to start or break accident

Pre-control measures:Before the driver of the belt conveyor, the driver must check to ensure that the coal on the belt is empty before it can be stopped; The driver of the belt conveyor can find that the tear belt, the buckle is seriously damaged or the deviation is severe, and the overload can be overloaded. Stop.

2)Hazard source: Unblocked when the machine is stopped.
Description of risk and its consequences: It is easy to cause the belt to be accidentally started and cause injury.
Pre-control measures: The stop button and the emergency stop button must be locked after the belt conveyor driver stops.

3)Hazard source: The entrainment device is not checked for its integrity.
Description of risks and consequences: It is easy to cause accidents.
Pre-control measures: Before the mine maintenance fitter checks, the fixing bolts of the entrainment device are not damaged, and the entrainment device is not deformed before use.

4)Hazard source: The plywood fixed belt is not checked for safety.
Description of risks and consequences: It is easy to cause equipment damage and equipment damage caused by equipment startup.
Pre-control measures: Check whether the various procedures in the operation meet the requirements by the mine maintenance fitter; Whether the belt clamp clamps the belt and whether the bolts are tightly secured.

5)Hazard source: The unchecked personnel are away from the belt before the loose belt.
Description of risks and consequences: It is easy to cause crushing.
Pre-control measures: The mine maintenance fitter can check the belt before the loose belt and confirm that there is no operator in the belt and the running part before releasing the belt.

6)Hazard source: The method of using the chain hoist is not correct and the chain hoist used is not perfect.
Description of risks and consequences: prone to loss of injury or equipment damage.
Pre-control measures: Mine maintenance fitter must check the plastic deformation of the chain and the wear of the manual hoist before using the manual hoist. When the chain extension exceeds 5% of the original length or between the links and the link between the link and the hook Wear should be reduced to less than 80% of the original diameter, and the wear of other parts should be reduced to less than 90% of the original diameter; Check the chain and hook of the manual hoist for distortion, severe rust or scale, such as chain and hoist Do not use if the hook is distorted, severely corroded or has fouling; Check the wear of the dangerous section of the hook. If the wear is reduced to more than 10% of the original size, do not use it. Check the hook, if there is repair welding or Do not use when welding, drilling, hook surface is not smooth, cracked, folded, etc.

7)Hazard source: The tension is not fully released.
Description of risk and its consequences: Excessive tension is causing damage to the entrainment device, causing casualties.
Pre-control measures: After the mine maintenance fitter releases the tension, check whether the tensioning device is completely loose, and must be repaired without tension.

8)Hazard source: The gas concentration is not checked.
Description of risks and consequences: Easy to cause gas accidents.
Pre-control measures: Before the switch is opened, the mine maintenance fitter must check and ensure that the gas concentration does not exceed 0.5%. If the gas concentration exceeds the limit, contact the ventilation area in time and wait until the gas concentration is normal.

9)Hazard source: The entrainment device is not fixed firmly.
Description of risk and its consequences: easy to lead to running.
Pre-control measures: The mine maintenance fitter selects the appropriate position, clamps the upper and lower belts and fixes them on the belt frame.

10)Hazard source: The belt tension is too large.
Description of risks and consequences: Easy to cause tape damage.
Pre-control measures: Mine repair fitter must check to confirm that no one is standing on the belt before loosening the belt; Start the tension winch, loosen the tension to ensure the tension of the tape; 3 Mine maintenance fitter uses the chain to loosen the drum Tape.

11)Hazard source: The personnel are not properly matched when the end cap is removed.
Description of risk and its consequences: It is prone to fall off the cover.
Pre-control measures: 1 Mine maintenance fitters must use tools that match the bolts; 2 Mine repair fitters must be directed by a special person, and the two cooperate to remove the end caps.

12)Hazard source: The personnel are not properly matched when the bearing is removed.
Description of risk and its consequences: It is prone to bearing drop.
Pre-control measures: Mine maintenance fitter loosen the non-replacement bearing side bearing foot bolt, loosen the replacement bearing side upper and lower wattage joint bolts, use the hoisting chain to hoist the bearing upper truss; Mine maintenance fitter sling will be replaced The side bearing is pulled out by the sling to the bearing to leave the lower pedestal. If necessary, cut off the old bearing with gas or pull out the old bearing with the dial.

13)Hazard source: The bearing frame is not cleaned.
Description of risks and consequences: Easy to cause bearing damage.
Pre-control measures: The mine maintenance clamp first cleans the inside of the bearing frame, and then heats the new bearing with the oil basin, and then quickly installs it in place.

14)Hazard source: The lock nut and lock piece are not installed according to the operating procedures.
Description of risk and its consequences: Bearings and shafts are prone to bearing damage.
Pre-control measures: After the mine maintenance fitter installs the new bearing in place, tighten the lock nut with the lock tongs, lock the lock nut with the lock piece, install the dust seal, the upper tile shell, and the bolts that fasten the bearing pedestal.

15)Hazard source: No dust ring and fastening bearing frame bolts.
Description of risks and consequences: damage to bearings.
Pre-control measures: The mine maintenance fitter presses the sealing ring in the sealing groove and tightens the screws of the bearing pedestal.

16)Hazard source: The bearing is not oiled as required.
Description of risks and consequences: Easy to cause bearing damage.
Pre-control measures: When the mine maintenance fitter fills the replacement roller bearing, check that the grease is qualified, and the oil quantity is added to 1/2-2/3 of the volume of the oil chamber.

17)Hazard source: Belt tension is not suitable.
Description of risks and consequences: Equipment damage or personal injury caused by misuse.
Pre-control measures: Mine maintenance fitter should check the surrounding personnel when manipulating the tension switch button after replacing the roller bearing to make the two entrainment devices loose; Mine maintenance fitter should check the surrounding personnel when starting the tension winch to tension the belt. When the tensioning winch is started, when the belt reaches a certain tension, the entrainment device is removed, and the belt is tensioned. When the tension is tightened, the two people cooperate, one person operates, and one person observes the tension of the belt.

18)Hazard Source: Field tools are not cleaned.
Description of risks and consequences: Easy to cause damage to the belt.
Pre-control measures: Mine maintenance fitters must clean up the tools on site before starting the machine, confirming that all tools are fully collected and free of debris.

19)Hazard source: Persons around the equipment were not inspected.
Description of risks and consequences: Easy to be pulled by a rotating belt.
Pre-control measures: The mine maintenance fitter checks the personnel around the belt before starting the machine, and confirms that there is no personnel before starting.