Solutions by conveyor type

Conveyor belt selection is a deductive process which must first address the production and engineering criteria of the user. The demands of the customer relate to the expected load on the belt, hourly throughput, orientation, or position of the conveyor in the production room and the dimensions and features of the conveyor that limit belt choice, such as Minimum Pulley Diameter. These criteria are what dictate belt choice in the given conditions.

Once the above criteria are defined, the items being conveyed should be matched up with the correct belt type. The characteristics of the product being transported impacts the belt choice. Varying textures on the carrying surface of the belt may assist movement depending on product type such as berries or granules moving on a moderate inclined angle. The product may have acidic content that is not suited to certain belt types, where chemical degradation will quickly crack the belt surface. Similarly, exposure to UV may mean a darker belt is a better choice.

Horizontal Conveyors

Horizontal conveyors are the most basic and widely used conveyor style in the market. They are used on assembly lines, small parts handling, food processing and integrated inside more sophisticated machinery to give increased throughput. They have fewer limitations than other conveyor types in terms of dimensions, speeds, load, and space required. They can be suited to accumulation or telescopic applications. Much of the same can be said for simple two-axle conveyors when used on a slight incline. They can function well depending on the angle, product type and flow rate.

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Elevators

Elevators using cleated or sidewall conveyor belts are an accepted solution for transferring products from one height to another. They can be used to elevate or lower a product down, as in an IQ freezer outfeed. Elevators can have one inclined section or additional horizontal sections that require the belt to ‘transition’ from one orientation to another. Elevators can be simple two-axle conveyors, or they can have one horizontal section (L-shaped) or two horizontal sections (Z, swan-neck, or goose-neck).

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Center Drive

Centre drives are most common on horizontal conveyors. This style is used where a processor looks for advantages such as saved distance between conveyors, dual direction, and tight transfer. The belt path on a standard two-axle conveyor, with a drive pulley at one end is simple but does not always fulfill the customers’ needs. One additional option is the center drive. This involves positioning the motor beneath the conveyor with the tensioner located on the same axle beneath the conveyor. This design is also critical where small diameter rollers are located at both ends of the conveyor. The rollers may not be large enough to motorize and may even be static ‘nose bars’ used extensively in bakeries. The motor in these cases must be on a third axle.

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Trough

Trough conveyors are commonly used on transfer lines, small parts handling, and food processing. They share most of the design characteristics of two-axle conveyors but with the additional raised edges to contain the product on the belt. This feature requires belts to be flexible and to maintain their shape over the pulleys and on the return. They are often used on incline conveyors to hygienically contain the product. Care is always required to ensure that the infeed of a product onto the belt is suited to the demands of the processor and the capacity of the conveyor. It is imperative the product is contained on the belt and does not fall under and inside the belt path.

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