What are the design principles for idler spacing?

What are the design principles for idler spacing?

The core of idler spacing design is to minimize the number of idlers,reduce resistance,and lower costs while ensuring the conveyor belt does not sag and operates stably.The main principles are as follows:

***Determine the spacing based on the conveyor belt width and load:**The greater the load,the wider the belt width,and the heavier the belt,the smaller the idler spacing should be to prevent excessive belt sag,belt misalignment,and material spillage.For light loads and short distances,the spacing can be appropriately increased to improve operating efficiency and reduce investment.

***Upper Idler(Load-bearing Section)Spacing:**Commonly used for conveying bulk materials is 1000–1200 mm.For heavy loads and large materials such as those found in mines,coal,and sand,the spacing is reduced to 800–1000 mm.At points of high impact where materials fall,buffer idlers must be densely arranged,with a spacing of generally 300–500 mm,to protect the belt and idlers.

***Lower Idler(Return Section)Spacing:**The return belt only bears its own weight,with a smaller load,so the spacing can be increased,typically 2000–3000 mm,saving on idler usage.

Avoid excessive belt sag.Excessive belt sag will exacerbate belt misalignment,vibration,noise,and energy consumption.Generally,the sag should not exceed 1%to 2%of the belt width;use this as a reference to check the spacing.

Arrange self-aligning idlers and supports.Install self-aligning idlers at regular intervals.For long-distance conveyors,generally one self-aligning idler is installed every 6 to 10 sets of ordinary idlers to ensure belt alignment.

Consider belt speed and operating environment.The higher the belt speed,the smaller the idler spacing should be to improve operational stability.In harsh environments such as corrosive,dusty,or high-temperature conditions,appropriately reduce the spacing to improve overall machine stability.

GB/T 7714：

Liu B,Yang S.Analysis of belt conveyor energy consumption and idler optimization methods[J].International Journal of Mining Science and Technology,2019,29:445–453.DOI:10.1016/j.ijmst.2019.06.007.

APA：

Liu,B.,&Yang,S.(2019).Analysis of belt conveyor energy consumption and idler optimization methods.International Journal of Mining Science and Technology,29,445–453.https://doi.org/10.1016/j.ijmst.2019.06.007

MLA：

Liu,B.,and S.Yang.“Analysis of Belt Conveyor Energy Consumption and Idler Optimization Methods.”International Journal of Mining Science and Technology,vol.29,2019,pp.445–453,doi:10.1016/j.ijmst.2019.06.007.