In the process of using TPU conveyor belt, users often encounter the problem that the conveyor belt needs to be repositioned in the case of machine maintenance, conveyor belt maintenance and conveyor belt replacement. Here we should first understand the stress and deformation process of TPU conveyor belt. The main material of the conveyor belt, TPU, is a synthetic material, which will produce viscoelastic phenomenon under the action of tension. When an external force is applied to the conduction band, it will be extended according to its hardness. For the guide belt, the hardness per millimeter of the width of the guide belt is represented by the “static state”. If a constant force is applied to the conveyor belt, the extension of the conveyor belt will be generated accordingly. There is, however, a small increase in elongation over time, sometimes called a “long-term extension,” until extreme elongation is reached after a period of time. The extension of this section is represented by “relaxation state”. Similarly, when the constant force is removed, the “rest” extension is immediately released. The rest of the extension takes a while to release, so it’s not really a long-term extension.
Before tensioning the new PU, make the conveyor belt in a state of no tension, and mark it on both sides of the front edge of the conveyor belt (mark it on both sides of the back edge of the conveyor belt, so that the mark can be retained for a long time). Using the tensioning device to tensioning the guide belt, measure the length of the mark with a ruler. Assuming that the guide belt needs to be extended to what value the measured value reaches, the tension will not be increased. After several laps of operation, measure the mark again, if the data has not changed, the tension will be adjusted.
After a tensioning polyurethane conveyor belt, the elongation of the guide belt will be stabilized, and its elongation will not change after a long time of operation. When the conveyor is in need of maintenance, the guide belt will be relaxed. When the guide belt is tensioned again, it is sometimes impossible to determine whether the guide belt is in a “long-term extension” state, so it cannot be marked with the old recording mode. It should be marked with new requirements.
Before the conveyor belt tension is relaxed, mark the PU conveyor belt on both sides of the front edge.
If the mark made on the back of the first tensioning guide belt is still there, you do not need to use the previous requirements of the tensioning guide belt, the old mark can be used according to the tensioning way of the new guide belt. If the maintenance of the machine is less, the guide belt can also be re-tensioned by marking on the tensioning device. But do not judge whether the conveyor belt is tensioned or not by hand feeling.
The conveyor belt is trimming
When the tension of the guide belt is adjusted, the deviation of the guide belt can be corrected. At this time, the automatic deviation correction device and the edge guard device of the machine should be separated from each other. The deviation of the guide band can be corrected in the following way.
When adjusting the conveyor belt, we should have enough patience. We can fix the ballpoint pen on the frame and draw the running trace on the conveyor belt. Generally, after running for 3 laps, we can cut the edge if the trace is not thick. Start the machine to make the conveyor belt run slowly and carefully cut the blade into the conveyor belt until it penetrates. If there are two cutting devices, the band can be cut from both sides at the same time, so that the transverse forces generated during cutting cancel each other out. When this is done, the rectifying device and conveyor belt baffle can be installed. These devices can only act as an auxiliary barrier to the deviation of the guide band. Note: If the guide belt always tends to deviate in one direction, the friction between the guide belt edge and the baffle will be very serious, and in the long run, the side part of the conveyor belt will be stratified.
