Top Two Conveyor Belt Troubles with Causes and Troubleshooting

Belt conveyor mistracking troubleshooting:

1. Align the head pulley, tail pulley and middle frame of the belt conveyor.

2. The belt conveyor shall be overhauled after a period of time, and the aged and deformed belt shall be repaired or replaced in time.

3. Adjust the position of the unloading chute so that it is in the middle of the belt.

4. Cut off the improper splicing part and redo the belt joint to make the joint straight. The standard is that the straightness tolerance on the length of 10m is no more than 20mm.

5. Shut down the belt conveyor and clean off the material built on rollers and idlers. Overhaul the cleaners or add new cleaners to clean thoroughly.

6. Belt mistracking caused by improperly installed idler frame can be fixed by moving the idler frame on the side that deviates forward toward the direction of the belt. Generally, the deviation can be corrected by moving a few idlers. When the deviation is serious, the idler frame needs to be re-calibrated to keep the level error of the roller group within the allowable deviation. If the belt deviation is caused by the loose bolts that fix the idler frame, tighten the loose bolts to solve the problem.

Conveyor belt slippage

When the belt is running, its speed should be the same as the linear speed of the surface of the drive pulley, and the belt speed cannot be lower than 95% of the linear speed of the surface of the drive pulley. While, in practice, due to various reasons, the speed of the belt is not synchronized with the speed of the drive pulley, or the drive pulley runs but the belt does not move. This phenomenon is called belt slippage.

Belt slippage may cause material spillage. In severe cases, it may cause belt wear and breakage, and motor burnout. Therefore, belt slippage can be a significant safety hazard.

Causes for belt slippage:

1. Inadequate tension.

The belt functions well only in a surprisingly narrow range of tension. Sufficient tension ensures sufficient friction, making it impossible to drive the belt with loading.

Generally, a vertical heavyweight tension device or a heavy-duty trolley tension device is used for tensioning in a long inclined belt. However, due to the fall of the counterweight, the jamming of the idlers, and the excessive stretching of the belt after years of use, the tension of the belt will be seriously insufficient. Once belt slipping occurs, a large amount of material will be scattered and piled up, which is difficult to handle and needs a long downtime to deal with.

The screw tension device is for the conveyor with short length and small power. Due to factors such as screw rusting and excessive stretching, insufficient tension will occur after long-term use, resulting in belt slippage.

2. Badly worn lagging of driving pulley.

Conveyor pulley lagging is an essential part of a belt conveyor system. It can effectively improve the operation of the conveying system, protect the metal pulley from being worn and increase the friction between the belt and the pulley, thereby reducing the belt slippage. After the belt conveyor has been running for many years, the pulley lagging is severely worn, and the coefficient of friction between it and the belt will decrease sharply, which can easily cause the belt to slip.

3. Inadequate friction between the drive pulley and the belt.

If the friction between the drive pulley and the belt is insufficient, it will easily cause belt slippage. Decreased friction coefficient caused by water belt and damp environment is the main reason for that.

4. Overload of belt conveyor.

Conveyor belts carry heavy loads all the time, but they do have their weight limits. When a conveyor belt tries to move things heavier than its limit or starts with load, the belt may slip.

5. Failed conveyor belt slip detectors.

Usually, the belt conveyor is equipped with a belt slip detector. When a slip occurs, it will send a fault signal and stop the belt conveyor.

Conveyor belt slippage troubleshooting:

1. Maintaining an adequate belt tension is critical to preventing slippage. Its important to note that do not over-tension the belt, as it can stretch and damage the belt, as well as put added stress on the motor.

2. Replace the worn pulley lagging in time. In daily inspections, attention should be paid to the inspection of pulley lagging to avoid belt slippage.

3. Sprinkle some rosin powder on the drive pulley, blow it in with blowing equipment instead of by hand to avoid personal injury.

4. Monitor the current of the belt conveyor and the electronic belt scale to control the weight of materials and avoid overloading.

5. If the belt conveyor shuts down due to a slip failure, check the belt conveyor on the spot to determine whether the belt conveyor really has slipped.

If the shutdown is caused by false slip signal, clean the sticky materials on the belt slip detector, rearrange its position and eliminate electric appliance circuit failure.

The above are solutions to belt mistracking and slippage. In order to extend the service life of belt conveyor, and improve productivity, regular maintenance should be carried out on the belt conveyor.

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