Dunlop conveyor manual dunlop industrial - 1982

Product Range In this brochure, you will find information about our company, cover grades, products and services. English web version Spanish web version French web version Dutch web version Italian web version German web version Polish web version Portuguese web version Russian web version — English Catalogue. Comparision Card Ultra X Below you can also find a comparison card that helps to explain the technical differences between Ultra X1 and X3 and conventional multi-ply belting.

Technical Bulletins These technical bulletins provide useful explanations and technical information regarding specific conveyor belt subjects.

Dunlop Steelcord In this brochure, you will find information about Dunlop Steelcord. Dunlop Ferroflex In this brochure, you will find information about Dunlop Ferroflex. Dunloflex In this brochure, you will find information about Dunloflex — English Datasheet.

Dunlop BVGT In this brochure, you will find information about Dunlop BV GT, that is a unique and outstanding rubber compound specifically developed by Dunlop technicians to withstand multiple combinations some of the toughest and most demanding operating conditions imaginable as well as providing unbeatable belt life expectancy.

Dunlop Manchons In this brochure, you will find information about inner rubber linings from Dunlop — English Datasheet. Dunlop Splicing kits Dunlop belts perform best when fitted using Dunlop splicing materials. Profiled belting Fishbone and Rufftop profiles provide a highly durable and efficient surface grip. Elevator Belting The highest standards of safety, providing first-class operational performance and the longest, and most cost-effective, working lifetime.

Can't find what are you looking for? View all products or Contact us. When you buy Dunlop you also buy peace of mind Read more about our products. Get your Dunlop Belt Buddy app! Download for Android Download for iOS. Dunlop Conveyor Belting. The Longest Lasting Conveyor Belts. Facebook Youtube. As the provider of energy, it is of course absolutely essential that power generation plants are totally reliable.

Consequently, it is also essential that conveyor belts used within power plants are as equally reliable. Out of necessity, disruption caused by the need to repair and replace belts has to be kept to an absolute minimum.

The only way to achieve this objective is to fit top quality belting that has a proven track record for being the most durable and longest lasting available. Safety and the environment are also of paramount importance in the energy industry. Table Load support Choose the lowest class which meets the tensile strength requirement.

Looking at Table 14, determine which load category best describes the load being conveyed i. A, B, C, D or E category load. The value obtained at the intersection of the belt specification row and the load category column gives the maximum width at which that belt specification can be used.

Number of plies for troughability The maximum number of plies allowable, in order to ensure that the empty belt will conform to the contour of the troughing idlers, must be checked referring to Table For a particular belt class the value shown at the intersection of the belt width column and troughing angle row, is the maximum number of plies that should be used. Minimum pulley diameters If the size of the pulleys is already determined, the belt construction provisionally selected from the previous considerations can be checked against the relevant pulley diameters for suitability.

For a new installation, the pulley diameters should be equal to or larger than those given in Table 13 It should be noted that, in this context, the diameters quoted refer to the minimum pulleys around which the particular belt construction will flex satisfactorily.

The conveyor designer should also take into account the gearbox ratio and required belt speed when selecting the drive pulley diameter. Gauge of covers required The correct gauge of cover necessary to give protection to the belt carcass from material impact and wear must be determined by consideration of the size and density of the material to be handled.

Belt mass The mass of a particular belt construction can be determined by adding the carcass mass found in Table 17 to the combined mass of covers found in Table This will give the mass per unit area. To calculate the mass per unit length multiply by the belt width in metres. Belt thickness The belt thickness can be obtained from the information given in Table Multi-ply textile reinforced rubber belting. The mass per unit length is determined by multiplying the total mass by the belt width in metres.

Impact energy can be calculated for any material of known lump mass and vertical velocity. Calculating vertical curves, or 2.

Determining belt tension for conveyors of undulating profile. It is necessary to calculate the belt tensions at various points on the conveyor. Calculating the tension at any point along the conveyor. The tabulation method described below is a convenient means of calculating the tensions at any point on the conveyor. The following method is used to determine the tension at any point along the conveyor: 1.

Calculate the length correction factor. Look up the mass of moving parts in Table Calculate the mass of the load from the design capacity and the belt speed. Calculate the maximum effective tension under constant speed operation. This will always occur when all the non-declined sections of the conveyor are fully loaded and the declined sections empty.

Determine the minimum value for the slack side tension under maximum load condition. Commencing from immediately behind the drive, label each pulley, intersection point and loading section. Start and end point of each of the load lengths should also be labelled. Determine the effective tension required to overcome the frictional and gravitational resistances for each of the segments of the conveyor by using formulae on page 4.

The value of 12, determined in 5 above, is used to calculate the effective tension to overcome pulley friction. The effective tension at any point on the conveyor is the sum of the effective tensions of all preceeding segments. The total effective tension for the conveyor is the sum of the effective tensions for all segments.

The tension at any point 'x' on the conveyor is made up of the effective tension at point 'x' plus the slope tension at point 'x'. Superimposed on this is the tension applied by the take-up system. The tension applied by the take-up is given by the worst case T2 value i.

It may be found that the value of T2 obtained when the maximum effective tension has been calculated is different to that used in the calculations. If this is the case the new T2 value is used to calculate tensions at each point. Steps 7, 8 and 9 should be repeated for four load cases viz empty, fully loaded, non-declined sections loaded and declined sections loaded. The overall change in elevation on the non-declined sections is 70 in. Note that the actual length of the conveyor is used to calculate Tx and only the loaded length to calculate Ty.

The length correction factor is a constant and is used to convert the actual length to a corrected length. Belt cleaning systems such as scrapers can also cause wear to the top cover surface. Wear on the bottom cover is mainly caused by the friction contact made with the drum surface and idlers.

The rate and uniformity of this type of wear can be adversely affected by many other factors such as misaligned or worn drums and idlers set at incorrect angles. Factors such as unclean environment, where there is a build up of waste material can cause added wear on both the top and bottom covers of a belt. Contrary to popular belief, short belts below 50 meters usually wear at a faster rate than long belts due to the higher loading frequency.

This is because the belt passes the loading point more frequently compared to longer length belts. For this reason, the selection of the correct type of cover quality and thickness of shorter length belts is even more important than usual. The two most important characteristics are resistance to tear and abrasion. Tear strength is important where sharp objects are being transported such as rocks, metals for recycling and timber that can cause cutting and gouging.

Abrasion resistance is especially relevant where fine materials such as aggregate, sand and gravel are being carried, because these materials tend to create a highly abrasive effect in a similar way to sandpaper when they fall onto the belt.

Cover thickness The actual thickness of the cover is an important consideration in actual belt selection. Generally speaking, the more abrasive the material being carried and the shorter the conveyor, the thicker the cover should be.

However, covers that are too thick can potentially cause other problems. In principle, the difference in thickness between the top cover and the bottom cover should not exceed a ratio of more than 3 to 1. The thickness of top and bottom cover is stated in millimetres mm. The permitted tolerances of the cover thickness according to international standards are: Cover thickness up to and including 4 mm: - 0.

It is important to point out that there is a significant difference between resistance and fire retardation. In basic terms, heat resistant belts are designed to carry materials at high temperatures with a minimum of aging whereas fire retardant belts are constructed using materials that, for safety reasons, do not continue to burn once they have been ignited and the source of the flame has been removed.

Heat Resistant Covers Conveyor belts that are used to carry materials at high temperatures as well as belts used in high temperature environments, such as elevator belts in the cement industry, are exposed to an accelerated ageing process resulting in hardening and cracking of the rubber surface caused by the heat.

However, this process can be significantly delayed by selecting the quality of cover best suited for the specific conveyor application and the environment that it is operating in. The selection of the correct cover quality can become much more complicated depending on the nature of the materials being carried. For example, fine materials usually cause a greater concentration of heat on the belt surface because of the lack of air circulation between the hot material particles.

In the case of sinter for example, the actual temperature of the material can be extremely high, but because it is a coarse material there is better air circulation between the particles. Generally speaking, belt covers that have a high resistance to heat have a lower resistance to wear and tear. The Dunlop solution to this dilemma has been to develop covers that have a combination of both heat and wear resistance resulting in a much longer operational lifespan.

Extreme conditions High temperatures can have a seriously damaging effect on the actual belt carcass itself, because heat can cause damage to the adhesion between the cover and the carcass and also between the inner plies contained within the carcass. Choosing the correct thickness of the cover is essential because the cover acts as a barrier between the heat source and the carcass. The most critical area is the splice joint because this is invariably the weakest point in any conveyor belt.

Industries where heat resistant belts are commonly used include the cement industry, recycling plants, the steel industry, foundries, the chemical industry and the petrochemical industry. Dunlop customers are always encouraged to discuss their specific needs with our team of specialists to help to find the most cost effective solution. Oil and Fat Resistant Covers Conveying materials that contain oil and fat can have a very detrimental effect on the performance and life expectancy of a conveyor belt because it penetrates into the rubber causing it to swell and distort, often resulting in serious operational problems.

Oil and fat resistance can be divided into two sources; vegetable and animal oils and fats mineral oils. Dunlop use a very special compound formula in the ROM cover grade quality, which is specifically designed to resist the penetration and therefore the damaging effects of animal and vegetable oils and fats.

Mineral oils are the most aggressive and therefore demand a particularly high level of protection. To resist highly aggressive mineral oils, Dunlop has also developed a special compound formula the extremely successful ROS cover quality. Covers that are both oil resistant and fire retardant are also available from the Dunlop range. Fire Retardant Covers Fire retardant belts are primarily needed for internal transportation within buildings and also in tunnels and mines where safety is naturally of paramount importance.

Because fire safety is such a very important issue, there are numerous safety classifications and international standards. There are many different tests used to measure performance against the various international standards. The basis of most of these tests involves the use of samples of belt and exposing them to naked flame, which causes the samples to burn.

The time it takes for the belt sample to self-extinguish or the amount of belt actually remaining after the flame has been removed is then measured. This standard makes the distinction between flame retardation with covers K and flame retardation with or without covers S.

In some environments where coal dust, gas, fertilizer or other combustible materials are involved, it is essential that the conveyor belts being used cannot create static electricity that can ignite gases and dust in the atmosphere.

A very important safety feature of all Dunlop belts with rubber covers is that they are anti- static and conform to EN ISO international standards and therefore can be used in ATEX classified surroundings.

Excellent resistance to cuts, impact, abrasion and gouging RE X H 80 90 NR resulting from large lump sizes of heavy, sharp and high drop heights. According to EN For low ambient temperatures please ask for information regarding our Coldstar range. See for the specifications page 25 and 26 and for more detailed information the individual product brochures. Aramid Belting The Staramid belt range has been specially developed for use on very long conveyors.

It has a synthetic carcass with low elongation properties compared to belts with a Polyester-Nylon carcass. See for the specifications page 26 and See for the specifications page 23 and 24 and fore more detailed information the individual product brochures. Slider belting Slider belting is used on those installations where the idlers in the top part have been replaced by slider plates of wood, metal or plastic.

Slider belting is most commonly used in the transportation of individual items and packages. Dunlop slider belts have a special rubber layer that provides the necessary transverse rigidity to create the flat, even surface needed to efficiently transport individual items packed in cardboard, Hessian, paper and plastic.

The low friction polyester fabric used on the bottom of the belt provides both high wear resistance as well as low power consumption properties. Rufftop and Fishbone profiled covers are often used on slider belts to provide the surface grip needed to avoid slippage when steep inclines are involved. The dimensions and methods of fastening of the buckets have been defined in standards.

Belt widths Elevator belts are available in standard widths up to and including mm. Carcass The textile carcass consists of three up to six plies of synthetic Polyester-Nylon fabric EP. EP-fabric is impervious to moisture, has a low elongation and a high tensile strength. The choice of belt type and number of plies depends on the required tensile strength and bolt holding ability. The steel carcass consists of one layer of steel warp cables and two layers of steel weft cables one at each side of the warp.

This provides excellent resistance to the tear-force generated by the bolts of the buckets and fasteners. We aren't satisfied with just producing the best conveyor belts in the World. Our highly-trained and experienced team of splicing specialists will ensure that the best techniques are used to achieve the strongest and most reliable joints. Read more about our products. Our technical calculators include belt thickness and weight, roll size and belt length from a coiled roll, also transition distance and convex curve lay-out, even motor power and capacity calculations.

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