Hanger bearings are an essential part of the screw conveyor mechanism. The bearing provides a surface to support multiple screw sections in a conveyor. This is important to create frictionless movement between the conveyor parts and optimal operations.
Thus, choosing the correct bearing for the proper operation is crucial to the system’s efficiency. This article will cover what you need to look out for when deciding on a suitable hanger bearing.
The size of the hanger bearing is determined by the shaft size. Bearings come in standardised sizes to match these shafts. The typical standard used has been created by the conveyor equipment manufacturers association, known as CEMA. The dimensions are as follows:
- 1 to 1 1/2 inches
- 2 inches
- 2 to 2 7/16 inches
- 3 inches
- 3 to 3 7/16 inches
The variation in sizes is based on the different sections of the bearing.
Styles of hanger bearings are also categorised by CEMA based on a numbering system. The numbers reflect subtle differences in shape and design. You should always check your hanger style to ensure it is compatible with your system. Common CEMA styles include:
It’s worth noting that some systems can use more than one style. For instance, 220 and 226 use the same bearing. As do 216 and 230.
The choice of material is one of the most important decisions you need to make. You can get an idea of the best hanger for your application by looking at the specifications of the materials.
Wood hanger bearings are often popular for feed, grain and fertiliser conveyors. But they can often serve many general-purpose applications. It is self-lubricating and comes in various CEMA Styles, such as 220, 216 and 19B. However, it is not suitable for high-temperature operations. The maximum operating temperature for wood bearings is 160F (70 degrees celsius).
Cast hard iron is another popular choice. It can withstand high-temperature operations up to 500F (260 degrees celsius). It comes in CEMA styles 220,216, and 19B. It can be used for lime, cement, salt and gypsum applications. However, it is not a self-lubricating material. It requires a hardened shaft and can be very noisy.
Ceramic is an impressive material for hanger bearings. It can operate at temperatures up to 1000F (roughly 538 degrees celsius). It’s compatible with 220 and 216 CEMA styles. It is self-lubricating and can be used for a diverse range of applications. For example, chemicals, food and cement. Though it requires a hardened shaft to operate effectively.
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