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Idler rollers are one of the key components that affect the performance of conveyor equipment; they account for 30% to 40% of the total weight of the equipment and 5% to 30% of its total cost. In conveyor systems, idlers are used to support the conveyor belt and the load, as well as to ensure that the sag of the conveyor belt remains within the specified limits. In the planning of conveying equipment, the selection of idlers and the number of them used have a significant impact on the proper operation, stable performance, maintenance costs, energy consumption, and overall cost of the conveying equipment. Due to the special role of conveying equipment in the field of transportation, research on the idlers of such equipment has become increasingly important. Currently, the research and analysis of idlers focus mainly on two aspects: their internal structure and their external design. Good results have been achieved in this regard; the internal structure of idlers now features a rational design, good sealing properties, reliable operation, and durability. As for their external design, it ensures good contact with the conveyor belt, providing protection to prevent the belt from drifting and thus increasing the conveying capacity. Additionally, the materials used for idler rollers are also an important aspect of the design. With the continuous increase in new types of materials, there are more and more materials available for manufacturing idler rollers; therefore, it is necessary to select appropriate materials to enable these rollers to perform better. To ensure the operational efficiency of the conveyor and reduce costs, reasonable structural design and manufacturing methods for the idler rollers are necessary. Based on the type of conveying equipment, idlers can be classified into different types. Specific to a certain conveying device, in terms of structure, idlers are divided into upper idlers and lower idlers. The number of upper idlers is generally 3-4, and the types include active idlers, self-aligning idlers, and cushion idlers, among others ； The number of lower idler rollers is generally 1-2, with the main types including cleaning belt idlers and ordinary idlers. With the development of conveyor technology, research on new types of idlers has also received attention, resulting in the emergence of some new products with unique designs and excellent performance. 1. Flexible idler rollers: Flexible idler rollers are those that possess flexible properties, providing excellent contact and protection for the conveyor belt during operation. In terms of operational capabilities, it enables an increase in the throughput of the conveyor and a reduction in the required inclination angle of the conveyor. It is generally used in general transportation industries. Depending on the available information, flexible idlers can be classified into parabolic idlers, spring idlers, adjustable spring idlers, flexible spiral idlers, wire rope core idlers, and other types. 2. Prevent the conveyor belt from drifting, and for active self-aligning idlers, the main types include vertical-roller type active self-aligning idlers, differential flexure roller type reversible self-aligning idlers, MT type reversible active self-aligning idlers, anti-drift spiral idlers, and active self-aligning idlers with spiral grooves. 3. The idlers of large-inclination conveyors mainly include double-row interlaced V-shaped deep-groove idler sets and deep-groove idler sets. 4. Non-metallic roller idlers: Non-metallic idlers refer to idlers made from non-metallic materials, and they are designed primarily based on the operating environment. Because the materials used in manufacturing idler rollers vary, their properties also differ. This type of idler roller can be used in transportation applications in industries such as chemicals, metallurgy, mining, salt production, and light textiles. The main types include ceramic idlers, enamel idlers, flame-retardant rubber idlers, and non-metallic impact-resistant idlers. Since there are now a variety of types of conveyor idlers, many problems arise when planning for these idlers. The main issues are: (1) There are a great variety of idler rollers available on the market, and they differ in structure and manufacturing materials, which results in significant variations in their performance. Idler rollers with good performance can last for over 10 years, while those with poor performance only function for a few days. The prices vary greatly, ranging from several thousand yuan to just a few hundred yuan. How to select idlers with reasonable prices and excellent features is the first issue users face. (2) In the conveyor structure, how to properly arrange the idlers is also an issue that must be considered. The number of idler rollers directly affects the conveying capacity and operating costs of the entire machine. During planning, it is necessary to select the roller spacing appropriately; while ensuring the transportation function, the number of rollers used should be reduced as much as possible in order to lower the overall cost and expenses, thereby improving economic efficiency. When planning idler rollers, there are three primary functional criteria to consider: (1) service life. Currently, there is no unified international standard; each **uses its own standards, but the service life of these rules is over 20,000 hours. (2) Operating resistance coefficient. There are characteristics related to the operation of the entire machine; different transmission systems have varying coefficients of operational resistance. (3) Idler roller component. The size of its components is directly related to the functionality of the entire device. Although the structure of idlers is relatively simple, the idlers planned today still do not meet **standard specifications; insufficient criteria are taken into account during design, such as the operating resistance coefficient being rarely considered. Therefore, when in use, idler rollers tend to fail and cause accidents, resulting in significant economic losses. This requires planners to improve the comprehensive performance of conveyors, focusing on key technologies such as starting technology, braking technology, active tensioning technology, and rapid tail movement technology, in order to enhance the reliability and service life of idlers and reduce the operating resistance coefficient.