Stahlseilfördergurte mit Verbindungsstellen ohne Festigkeitsverluste

Translated title of the contribution: Steelcord conveyor belts with splices without loss of strength

Michael Mühlbacher

Research output: ThesisMaster's Thesis

Abstract

For the transport of very high mass flow rates over longer distances, belt conveyor systems are preferred, as they work reliably, efficiently and economically without personal expenditure. The key component of a belt conveyor system is the conveyor belt itself. High mass flow rates as well as long conveying distances and abrasive materials, steelcord conveyor belts are almost exclusively used. With this type, the necessary tensile forces for conveying are absorbed by the steel ropes in the belt. Due to the limited delivery length of the belt, more than one splice is required. For operation at least one endless connection is always necessary These splices are the weak points of the conveyor belt. To nevertheless ensure safe operation, high safety factors are used for the dimensioning of the belt, which should consider the loss of strength in the belt splice. The aim of this thesis is to increase the strength of the belt splice. Consequently, the safety factors can be reduced through further investigations. This means that for the same application, a smaller belt class can be chosen. As a result, all other system components can be dimensioned smaller as well. With approximately 40% of the total cost of a conveying system, the belt is the most cost-intensive component. Therefore, considerable saving potential exists. An increase in the splice strength can be achieved if the tensile forces in the steel cords do not only have to be transferred via shear forces of the core rubber, but are additionally transferred directly from one rope to the other. Therefore, a rope connection was investigated which is built flexibly and can transmit the necessary forces. This connection consists of a braiding of metal wires or carbon fibre. The braiding adheres to both rope surfaces due to friction and thus transmits the tensile forces. Therefore, a single rope connection was first constructed, in which different influencing variables for tensile force transmission were tested. Additionally, it was investigated whether different materials between the rope ends could be used to support the braid from the inside in order to increase the force transmission. The highest force values transferred via the connection were provided by a combination of two layers of carbon fibre braiding that were braided onto a shrink tubing, which at the same time also serves as a carrier material for easier handling of the braiding. With these samples, an entire belt connection with a width of 350\ mm was constructed, comprising 22 ropes. The joint was vulcanized to also examine the behaviour of individual rope connections in the composite. This belt section was tested together with an identical belt section without a splice and one with a conventional splice, on a belt test rig.
Translated title of the contributionSteelcord conveyor belts with splices without loss of strength
Original languageGerman
QualificationDipl.-Ing.
Awarding Institution
  • Montanuniversität
Supervisors/Advisors
  • Sifferlinger, Nikolaus August, Supervisor (internal)
  • Prenner, Michael, Co-Supervisor (internal)
Award date25 Jun 2021
Publication statusPublished - 2021

Bibliographical note

embargoed until 03-05-2026

Keywords

  • Steelcord conveyor belt
  • splice
  • loss of strength
  • rope connection
  • splice strength

Cite this