托輥按其用途分類為調心托輥、緩沖托輥、槽形托輥、平行托輥。調心托輥的作用是糾正帶式輸送機的跑偏，通常輸送機的重載段上安裝回轉式槽形調心托輥，空載段上安裝平行調心托輥。緩沖托輥是根據實際情況應用于機尾架上的，受料時，可以降低物料對皮帶的沖擊，有利于沿長皮帶的使用壽命。槽形托輥一般由兩個側托輥和一州苗木 保定通風管道 絲網立柱模具 尼龍輸送帶 保定空壓機 高碑店養老院個平托輥組成，槽角度一般為30度，對于可拆卸式的帶式輸送機，槽形托輥的三個托輥互相鉸接在一起，故稱鉸接托輥。平行托輥一般為一個長輥，它安裝在承受壓力的下端故稱下托輥。
Idlers are classified into centering idlers, buffering idlers, groove idlers, and parallel idlers according to their purpose. The function of the centering roller is to correct the deviation of the belt conveyor. Usually, a rotary groove shaped centering roller is installed on the heavy-duty section of the conveyor, and a parallel centering roller is installed on the unloaded section. The buffer roller is applied to the tail frame of the machine according to the actual situation. When receiving materials, it can reduce the impact of materials on the belt, which is beneficial for the service life of the long belt. The groove roller is generally composed of two side rollers and one flat roller, with a groove angle of 30 degrees. For detachable belt conveyors, the three rollers of the groove roller are hinged together, hence it is called the articulated roller. The parallel roller is generally a long roller, which is installed at the lower end under pressure, hence it is called the lower roller.
There are two types of rollers in terms of material: steel rollers and plastic rollers. There are three types of bearing seats for idlers: cast iron, stamped steel plate, and phenolic plastic.
The sealing of the roller can be divided into steel and plastic. Their seals are internally filled with lubricating grease. The quality of the roller directly affects the electrical energy consumption and belt life of the belt conveyor. Therefore, dustproof sealing and good lubrication are important usage standards.