Three Point Bending Test and FEA Modeling of the Three Point Bending Test Unlike other published FEA of pipe belts, where simplified shell or solid elements are used to represent both rubber, steel cord and fabric materials, CDI uses a full 3-D pipe belt model where the rubber, steel cords and fabric layers are modeled individually with their own material properties.
Suggested belt speeds for various conditions are given in table A under Belt Conveyor Data. This information is essential for sound conveyor engineering: From the design point of view, there is a balance in the belt stiffness to achieve for each individual project.
View Larger Image Idlers: Rubber belting should be bolted to the outside of the skirts and nearly meet the conveying surface of the belt. Feeding the Belt For best results, the belt must be uniformly loaded.
This is a more fundamental approach than empirical Design of belt conveyor based on predefined DIN friction factor. Chutes should be so arranged that the material falls directly on the bottom wall of the chute and not directly on to the belt.
A third arrangement is a gearmotor-sprocket and roller chain drive to the head shaft, which makes for a very satisfactory and compact drive. The idler junction pressure index calculation is also a proprietary technology. Due to the efforts of the Conveyor Equipment Manufacturers Association, the basic idler elements—idler roll wall thickness, bearing sizes and shaft sizes—have been standardized into classes.
However, where the conveyors are extremely long, or are operated on an incline, or run fully loaded at speeds below feet per minute, safe belt loads must be computed by taking into consideration the horsepower pull or effective belt tension, the angle of wrap of the belt around the pulley, and the type of take-up whether it be a screw or counterweight take-up.
The actual center-line of the belt tension is off to one side from the physical belt center.
The maximum tight side tension of the belt employing screw take-ups is the effective belt tension times 1. A less expensive drive is one employing one or several spur gear reductions between the head shaft and the counter shaft. CDI has been developing this technology, applying it to conveyor design, and accumulating verification data since the It just prevents material spillage through the punctured region.
This T1 force determines the belt selection parameter. The project is a collaboration with Double Arrow Rubber Co. CDI is a pioneer in utilizing the LRR belt to optimize the conveyor design with reduced capital and operating cost. This is our proprietary program. InCDI designed a new dynamic splice fatigue machine that can test ST splice, maximum 12m distance between the center of two pulleys.
The safest form of investment for the new or expanding mine is for the mine to commission its own technical feasibility study or design audit The outcome of such audits or studies are usually beneficial and allow a clearer direction for the project implementation process.
There is also a substantial dimensional commonality as well. There are many variables to consider, for example, the number of broken cords, the location of broken cords, different trough angles, belt transition and trough, etc.
In most cases the design is based on known factors such as tonnage to be conveyed, weight per cubic foot of the material, size of pieces and belt speed desirable for the service intended. This is particularly true in mines that use longwall extraction and long belt conveyors.
By employing the standards, the designer uses the maximum belt tension and selected belt carcass as the starting point or criterion. Later experience, however, has shown the advantage of some standardization of these larger conveyors and they are now being included in our programs. Strain in Trough Conveyor from Finite Element Analysis Stress in Trough Conveyor Cross Section from Finite Element Analysis The FEA can also simulate the trough belt behavior at horizontal curve, especially when there is special idler arrangement 5 roll or deep troughsmall horizontal curve radius or specialty belt.
Once good numerical and experimental correlations between the three point bending stiffness and the six point pipe belt stiffness are established, there is no need to make full width belt samples and go through a trial-and-error process for each design before the actual belt production.
We first applied this technology in on the 20km Channar overland conveyor in Australiaand our latest applications are 27km Impumelelo overland trough conveyor in S. They are also in conveyor field services to find root cause of belt failure or conveyor failure, and to assist engineering for conveyor upgrade.
Take-up pulley—One diameter smaller than drive pulley. Figure 1 shows a graph of unequal tension distributions across the width of the belt. CDI uses Three Point Bending Test to measure the pipe belt stiffness, and calibrate the material properties of the pipe belt finite element model.
Originally, we felt these larger belts deserved the critical and careful analysis that results from individual design, and they were not included.
Drive snub pulley—Two diameters smaller than drive pulley.The belt conveyor is used for conveying different materials from one location to another.
The different components of a belt conveyor system typically are electric drives, pulleys, idlers, and a long belt.
Conveyor Belt Design.
CDI developed extensive testing data, project experience and analysis capability over 30 years. Our areas of expertise in conveyor belt analysis and testing are listed below. Design considerations affecting power demands, belt curves, transitions etc., are provided.
The layout of this manual and its easy approach to belt design will be readily followed by belt design engineers. The Problem with Designing a Conveyor System. The designer of belt conveyors is often faced with problems of determining the proper belt speeds, belt widths, number of plies in the belt, and idler spacing for conveyors employed in various parts of a mill.
Belt Conveyor Design View Larger Image Idlers: Due to the efforts of the Conveyor Equipment Manufacturers Association, the basic idler elements—idler roll wall thickness, bearing sizes and shaft sizes—have been standardized into classes.
Conveyor belt design – small (short – mm) and light conveyor intended for the pharmaceutical industry or food. Construction made from stainless steel. PVC belt with V guide profile K13 – from SAVATECH.Download