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Kalkylmodell för dimensionering av bandtransportörer
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2016 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
Calculation model for the construction of belt conveyors (English)
Abstract [en]

This thesis is the result of a final work for a Bachelor Degree in Mechanical Engineering at Umeå University. The project is made for the Swedish mining company Luossavaara-Kiirunavaara Aktiebolag (LKAB). The purpose of the project has been to develop a calculation model that can be used for designing new conveyor belt systems or optimize already installed objects. The program chosen for the calculation model is Microsoft Office Excel. The goal is that the calculation model will minimize the need to hire external workforce in questions concerning conveyor belts.The prioritized variables the calculation model is supposed to be able to handle are mass flow, volume flow, motor power, belt tensions and transition curves. Other variables that can be implemented if time permits are the selection of belt, pulleys, shafts and bearings for the calculated conveyor belt system.During the project the calculation model will be tested against already installed conveyor belt systems. The field studies are supposed to show how accurate the calculated values are compared to the actual ones.The result of the project is a calculation model based on three different calculation books and two manuals from LKAB. The model contains over fifty equations that are calculated immediately after the right variable is inserted into the program. In the fields next to the calculated value, the user can find information about the variable and a reference to the book that the equation is picked up from. The program has preinstalled values for idlers masses and belt weight, however the user can chose to activate the manual function and thus enter other values. The purpose is to leave the program open so the calculation can be based on any manufacturer of belt and idlers. The model is able to handle mass flow, volume flow, motor power, belt tensions, transition curves, belt type based on belt strength, and size on counterweight.Four conveyor belt systems were analyzed during the field study. The technical drawing was used to compare the installed motor power and the required motor power based on the calculations. In all cases, the calculated value was more than 70 % of the installed motor power, which is the minimum relation between the two values according to LKAB standards.During the field study the instantaneous mass flow and corresponding power consumption were analyzed. Thereafter, the mass flow was inserted into the calculation model and the calculated motor power was compared to the measured motor power. The best result gave a margin error of 2 % and the worst result deviated by 22.8 %. No further analyzis regarding the result has been employed. The field study has showed that the measured mass flow was relatively low compared to the value on the technical drawing, meaning that a large amount of capacity is unused. A suggestion for a future study is to investigate if this is a common phenomenon in LKAB and if there is any sustainable solution to optimize the process.

Place, publisher, year, edition, pages
, MA, 1601
National Category
Mechanical Engineering
URN: urn:nbn:se:umu:diva-121784OAI: diva2:934381
External cooperation
Luossavaara-Kiirunavaara Aktiebolag (LKAB)
Subject / course
Educational program
Bachelor of Science Engineering in Mechanical Engineering
Available from: 2016-06-09 Created: 2016-06-08 Last updated: 2016-06-09Bibliographically approved

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