What is Load Carrying Capacity of Conveyor Rollers & Selection of Rollers?
Updated: Nov 21, 2021
Rollers are integral part of Roller Conveyors. Gravity Roller Conveyors as well as motorized roller
conveyors are formed using rollers. The optimum roller selection is necessary, to avoid undue events in future.
If the under capacity rollers are selected, there are chances the required life of the conveyor cannot be guaranteed.
Higher capacity rollers will result in increased investment and so ROI.
For this, optimum roller selection is very necessary.
Roller conveyors are used for various usages such as conveying carton boxes, plastic crates, totes, drums of sizes, intermediate containers, wooden as well as metallic pallets, heavy duty automobile components and many more.
Here one should note that, we are discussing about conveyor rollers of a "Roller Conveyors". Roller
Conveyors are used for conveying carton boxes, components, etc. These are called unit handling
Bulk handling conveyor rollers which are used to make trough belt conveyors are in discussion here.
Please read here about the difference between the two.
Gravity Roller Conveyors move the product by way of gravity from higher heights to lower heights. Since no motor is used in these conveyors, there is no electric or any other consumption. They work on the basis of gravitational force. Gravity roller conveyors are the most widely used conveyors all over the
Motorized Roller Conveyors move the product with motor. Rollers have various options to run it using
power. Rollers are run with sprockets, timing pulley, o groove and poly v pulley. When controlled product
speeds are required, motorized roller conveyors are used.
The selection of conveyor rollers plays a major role in designing a roller conveyor. The selection of
conveyor rollers depend on
The weight of the component
Load carrying capacity of conveyor rollers
The loading and unloading conditions
Speeds of the conveyor
Weight of the component
The Weight of the component, plays important role. The weight of the component should be distributed inside the container properly. If the weight in a box is uneven, the behavior changes. In such cases, the roller pitch plays important role.
Load Carrying Capacity of Conveyor Rollers What is so special about that? One has to understand that the load-carrying capacity of a roller is
distributive and not concentric.
If you have to carry a jumbo Bag Pallet of 1 ton weight, it does not mean that the weight capacity of
each roller should be 1 ton. If the size of the pallet is 1mtr x 1mtr, the load is on the area 1sqm. The
rollers which will be in the area of 1 SqM, will have load of 1 ton. This load is not on a single roller. If
there are 10 rollers in this area, the load of 1ton, will be divided on 10 rollers.
It also means that if a roller is having length 500mm is given load-carrying capacity as 50Kg, it implies that you can put a load on the 500mm equally and at once. It is a distributive load. If you put the weight of 50kg on any small portion of the roller say 100mm, is not allowed. it is concentric
THE LOADING & UNLOADING CONDITIONS
The loading and unloading conditions should equally be paid off. A metallic component of 50kg, can run on a roller conveyor. But if while loading it is dropped from a height of 50mm, the roller may be damaged .
MATERIAL OF CONSTRUCTION
The contact material of the rollers plays important role in selection of material of construction. Corrosive Chemicals corrode the rollers and life of the rollers is affected. Environmental Conditions such as seashore industries requires ss304 material as the humid environment reduces the life of the rollers.
In some chemical industries, the normal working conditions become humid like seashore which affects the roller working.
when rollers are to be used in chemical industries, the behavior of the roller material with roller material, should already be tested.
Extreme conditions are always challenging. Extreme Cold or Extreme Hot conditions may affect bearing working.
Do you have a different opinion? Please comment in the below section.