The standard groove angle for the groove type idler is 35 degrees, so the most commonly used in each conveyor are the 35 degree groove type idler and the 35 degree groove type forward leaning idler.

Buffer rollers have 35 degree and 45 degree options. When using canvas conveyor belts, only 35 degree groove type buffer rollers can be selected. When using a 45 degree groove type buffer roller, it can be used in the section of the guide groove that is not affected by material impact.

Large capacity, long-distance, high belt tension, and important conveyors should generally be equipped with transition sections.

The return roller, also known as the parallel lower roller, is the most commonly used type of lower roller.

Self aligning rollers include ordinary self-aligning rollers, friction self-aligning rollers, and conical self-aligning rollers. The self-aligning roller is used to automatically correct excessive deviation of the conveyor belt during operation, ensuring the normal operation of the conveyor.