A Quick Guide to Conveyor Belt Endlessing (Splicing) - Monster belting (2024)

FAQs

What is the formula for conveyor belt splicing? ›

The overall splice length will be given by L = X + [S. (n-1)] Where n is defined, as the number of plies and s is the step length. All splices shall be made by stripping back the plies at the two ends of the belt in the required manner.

The typical angle of a step splice is 17 degrees, or 0.3 x belt width (B). This over-length needs to be taken into account when determining the endless belt length.

Endless splicing joins the two belt ends together either through heat or chemical activation, making the belt a continuous, endless band. The alternate method, mechanical fasteners, physically attaches a row of fasteners to each belt end. These fasteners are then meshed together and connected with a hinge pin.

“Belt splicing work is difficult and requires unique skills which impacts its attractiveness. A lot of that has to do with the lack of recognition for the trade, which is what we're aiming to change,” Mr Warren explains.

Butt joints are made by placing the two ends of a belt together and applying a 50mm wide piece of material underneath. This is then welded together ensuring the top surface is nice and flat.

With a plain belt (with no protrusions) we usually say the maximum angle is 20°. If you need to go steeper than that then a 15mm chevron pattern belt will take you up to 32°. If you need to go still higher than that, a troughed and flighted belt can go up to 45° for ordinary excavated material.

The most common splice angle is 17 degrees, which is an equivalent bias length of 0.3 x belt width.

Slitting machine

Companies specialising in conveyor belts usually own an industrial slitting device. It has a table with rollers that feed the belt to a stationary blade. This process cuts the belt fast and accurately; even narrow belts are done easily.

The step conveyor belt splicing method has two main techniques: Hot or cold (glued) and glued cold bond. Hot or cold glued is best utilized for thermoplastic belt styles and glued cold bond is commonly used on rubber belts.

What is belt splicing? ›

Conveyor belt splicing is the process of joining together two pieces of conveyor belt. Usually, this is done to either elongate the original conveyor belt or to repair a torn or damaged conveyor belt.

Endless splicing bonds two belt ends together by applying pressure with heat, allowing the thermoplastic material to flow and then bond together for a strong splice as the material cools and re-hardens.

Belt pull equals total weight times frictional coefficient between the bottom of the belt and the top of the slider bed. Then, convert this to required power. Convert that to a useful unit of measure. One horsepower (HP) equals 33,000 ft-lbs/min.

A more precise calculation formula is: (1) L=π(R+r)+2a+(R-r)^2/a (2) L=π(R+r)+2a+(R-r)^2/4a Where L is the belt length, R and r are the radii of the two pulleys respectively, and a is the distance between the centers of the two pulleys.

Belts: A belt decreases speed in proportion to the diameters of its pulleys or sheaves. The pulley on a motor shaft is typically smaller than the one on the machine shaft. The speed ratio is R = D_L /D_S, where D_L = diameter of large pulley, and D_S = diameter of small pulley.

Generally, conveyor belts are made from a rubber or plastic compound combined with one or more layers of fabric material or different diameters of steel cables. A conveyor belt may be made from polyvinyl chloride and fabric such as polyester or styrene-butadiene rubber and several layers of polyester or nylon fabric.