辊的基本类型
Basic Types of Rollers
托辊是带式输送机的重要部件，种类多，数量大。作用是支承皮带，减少皮带运行阻力，并使皮带的垂直度不超过一定限度以保证皮带平稳地运行。
The idler is an important part of belt conveyor, which has many kinds and large quantities. The function of the belt is to support the belt, reduce the running resistance of the belt, and make the vertical degree of the belt not exceed a certain limit to ensure the smooth operation of the belt.
托辊按其用途分类为调心托辊、缓冲托辊、槽型托辊、平行托辊。调心托辊的作用是纠正带式输送机的跑偏，通常输送机的重载段上安装回转式槽型调心托辊，空载段上安装平行调心托辊。缓冲托辊是根据实际情况应用于机尾架上的，受料时，可以降低物料对皮带的冲击，有利于沿长皮带的使用寿命。槽形托辊一般由两个侧托辊和一个平托辊组成，槽角度一般为30度，对于可拆卸式的带式输送机，槽形托辊的三个托辊互相铰接在一起，故称铰接托辊。平行托辊一般为一个长辊，它安装在承受压力的下端故称下托辊。
The idlers can be classified as centering idlers, buffer idlers, trough idlers and parallel idlers according to their uses. The function of the aligning roller is to correct the deviation of belt conveyor. Usually, the rotary groove aligning roller is installed in the heavy-load section of the conveyor, and the parallel aligning roller is installed in the no-load section. The cushioning roller is applied to the tailstock according to the actual situation. When receiving material, it can reduce the impact of material on the belt and is beneficial to the service life of the belt along the long belt. Trough idler is generally composed of two side idlers and a flat idler. The groove angle is generally 30 degrees. For removable belt conveyor, the three idlers of trough idler are articulated with each other, so it is called articulated idler. Parallel idler is generally a long roll, which is installed at the lower end of the pressure, so it is called lower idler.