The belt overturning system is a device that allows the conveyor belt to overturn on the return side, so that the worn belt side does not come into contact with the return roller. Due to prolonged transportation of materials, the surface of the belt is worn. But the reverse side is intact as before. Turning the belt over and using it will improve its service life.
The overturning of the conveyor belt refers to flipping 180 ° after the discharge point, so that its cleaning surface comes into contact with the carrier roller. The device has a simple structure, easy operation, and requires minimal manpower. It is installed in the appropriate position and can quickly flip a large area of the belt under the drive of the original drive device. And it can reduce labor intensity for workers, improve labor efficiency, and ensure the normal operation of the belt.
What types of belt overturning systems are there?
The belt overturning system can be divided into unguided belt flipping and guided deflection with rollers according to the application location.
- Free flipping: Install a pair of horizontal rollers at both ends, and the conveyor belt passes through the gap between the rollers
- Guided flipping: In addition to the two rollers added for free flipping, a pile of horizontal rollers is installed in the middle of the flipping section
- Support roller: On the flipping section, the conveyor belt’s non working surface is arranged in an arc to form several supporting rollers for flipping
What should be noted in the design of the turnover system?
The design of the turnover system is crucial. The length of the twist must be long enough to prevent excessive edge stress and long enough to prevent the center of the belt from bending. Generally speaking, flipping should be on the return side of the conveyor, as the tension there is low.
If the turnover system is not designed properly, there are the following risks:
- Early belt failure
- Splice strength affected
- Belt weight and longer turnover span
The following factors are important in designing a belt turnover system：
- Belt weight
- Rated tension of the belt
- Belt modulus
- Running tension
- Stopping tension
- Accelerated tension
- Starting tension
Belt tension calculation: It must be calculated at the point where the belt is flipped. If the calculated tension is relatively low, it is necessary to lengthen the length to avoid central buckling. It is necessary to add appropriate counterweights and loose edge tension to avoid exceeding the rated working tension of the belt. If the belt between the supporting pulleys sags, it can also affect the flipping of the belt.
Belt overturning is a simple, effective, and safe solution for replacement, which can reduce maintenance, costs, environmental pollution, and dust. In addition, it can also extend the service life of conveyor components. The conveyor belt uses a belt flipping device to flip the belt 180 degrees, with the dirty side facing upwards, to prevent backloading from accumulating on the idler or falling below the conveyor.
When the belt is twisted 180 degrees, it not only causes the edge of the belt to elongate, but also increases the edge tension of the belt. At the same time, it also correspondingly reduces the center tension, similar to the transition of the belt from groove to flat at the discharge pulley. To ensure that the force on the belt is within the range, it is necessary to calculate the amplitude of this tension increase and the belt sag between the supports.
The purpose of belt overturning is to minimize material accumulation on the return side of the conveyor system. By flipping the conveyor belt and allowing the clean surface of the conveyor belt to come into contact with the return roller, material cleaning on the return roller can be minimized. This can achieve more efficient and environmentally friendly operation of the conveying system.
For more information on belt technology, please contact NAR.