Fatigue in the shell of a conveyor drum

Affolter, Christian; Piskoty, G.; Koller, R.; Zgraggen, Markus; Rütti, T.F.

doi:10.1016/j.engfailanal.2006.11.071

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…The difference of the design scheme given in this work is that in the model, when forming the loading scheme of the drum by the tape, a modified Euler formula is used, which takes into account the dependence of the coefficient of adhesion of the tape to the drum on its tension force in the range of 0.1÷0.4 MPa. This model makes it possible to assess the influence of the variable friction force on the level of shear stresses on the surface of the drum shell, which is missing in the works on modeling given in the sources [11,12]. The formulation of the problem of the interaction between the tape and the drum was modeled as an assembly, which most adequately reflects the real physical model of the interaction between the tape and the drum and the forces arising from the contact.…”

Section: Discussion Of Experimental Resultsmentioning

confidence: 99%

“…To calculate the SSS of the shell according to the Vlasov theory, the model shown in Fig. 3 is used as the design calculation [12]. The calculations are performed under the following assumptions: the drum is firmly planted on the shaft, the distance between the supporting disks is equal to the width of the tape tension constantly on the width of the tape, grip tape drum happening across the arc of circumference, the force is transferred in accordance with the Euler formula.…”

Section: Fig 1 Belt Conveyor Diagrammentioning

confidence: 99%

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Development of a technique for computer simulation of the stress state of the drive drum shell of a belt conveyor to optimize its design parameters

Jassinbekov

Isametova

Kaldan

2021

EEJET

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The paper considers the method of computer simulation of the stress-strain state of the drive drum shell in the NASTRAN integrated environment. Due to the complexity of determining stresses and deformations in the drum sections by the analytical method, it is proposed to solve this important problem using the numerical finite-element method. At the preliminary stage of computer modeling, a mechanical design scheme was developed, including a variable pressure that changes depending on the angle of rotation of the drum, the deterministic relations describing the variable force factors are based on the Euler ratio. It is also proposed to take into account the pressure from the variable friction force, which depends on the changing coefficient of adhesion of the belt to the drum. As a result of the computer calculation, the equivalent Mises stresses of 65 MPa were determined, the safety factor was 4.2 and the components of the tangential stresses were determined using the stress tensor marker, the shear stress reached the level τ=16 MPa for fabric tape and τ=3.14 MPa for rubber tape. According to the results of the calculation, the dependence of the tangential stresses on the angle of rotation of the drum was constructed. A diagram of the change in the component of tangential stresses along the forming shell of the drum was constructed. Analysis of stress-strain state allowed us to determine the factor of safety of the drum shell. Based on the analysis of equivalent stresses, it is proposed to further calculate the durability of the drum using the method of long-term fatigue. The computer calculation of shear stresses in the component allows choosing the rational parameters of the lining, based on such indicators as peel strength and break, as well as determining the angle 61° of the slab lining required to improve the reliability and traction ability of the pipeline

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Section: Discussion Of Experimental Resultsmentioning

confidence: 99%

Section: Fig 1 Belt Conveyor Diagrammentioning

confidence: 99%

Development of a technique for computer simulation of the stress state of the drive drum shell of a belt conveyor to optimize its design parameters

Jassinbekov

Isametova

Kaldan

2021

EEJET

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“…The drive is accomplished in such a manner that there is simultaneous starting of both drive drums with gradual start-up in four phases, so that the maximum torque on the shafts of the drive drums is achieved in 30 s from the moment of starting. Such drive is characteristic for conveyor belts with large capacities and lengths of transport [1][2][3][4]. The largest diameter of drive drum shaft is 170 mm, located at the support, i.e.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Drive Shaft Fracture of the Conveyor Belt for Transport of Coal

Savković

Dedić

Pavlović³

et al. 2019

Teh. vjesn.

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The conveyor belt for slag and coal transport in the open mine pit "Kolubara"-Serbia is driven by means of two drive drums, attached on separate shafts. Each shaft is driven by two electric motors on both sides. During exploitation, the conveyor belt drive shafts are subjected to torques and transverse forces due to belt tension. The gearboxes and the bearing units on both sides of the drive drum support each shaft. A fracture of one of the drive shafts of the conveyor belt occurred at its connection point with the gearbox. The first part of the paper defines the loads relevant for shaft calculation, based on measurements in different phases of operation and the manufacturer's data. It is followed by the FEM analysis and fatigue analysis, for the most unfavourable load case. It has been established that the critical stress value has occurred near the connection point between the shaft and the gearbox, in the fracture zone. The second part of the paper presents chemical composition and mechanical properties of material, as well as metallographic examination of fracture surface. The experimental test procedure shows that the fracture has occurred not because of an error in the material but as a consequence of the inadequate heat treatment. Superposition of two negative influences: material fatigue and inadequate heat treatment, expressed in the cross section at the point of fracture is the main case of the conveyor belt shaft fracture.

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“…Sethi and Nordell (1993) evaluated a great variety of pulley designs using the finite element method (FEM) and considered fatigue, as well as design limitations and manufacturing criteria. Affolter et al (2007) studied the impact of the location, and of the cross-section of the welds using FEM. Lill (2007) stated that, as long as the stress limits given in BS 7608 (BSI, 1993) are not exceeded, the welds are extremely unlikely to fail.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis and improved design of large-scale belt-conveyor drums

Mihailidis

Savaidis

Bouras

et al. 2016

IJSI

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Purpose Large-scale belt-conveyor systems are extensively used in open mines to continuously transport bulk material. Conveyor pulleys are critical components and failures have significant financial consequences due to extended downtime. Aiming at increasing their durability, two critical spots are identified: the drum and the welds between end-plates and drum. Alternative designs have been evaluated. The paper aims to discuss these issues. Design/methodology/approach Loads on the driving drum are determined from measurements of the bearing force and the motor power. The friction interaction between belt and drum is described by the creep model and its impact is evaluated by comparing the results obtained for low and typical values of friction coefficient. Alternative designs are analysed using finite element method with optimised variable density mesh. The stress field and the deformations are calculated and evaluated. Findings Friction affects the torque transmission capacity and force distribution, but it is shown that in this case it has almost no impact on the maximum von Mises stress which occurs on the inside surface of the drum; therefore fatigue cracks initiated there, cannot be visually detected. A reinforcing diaphragm is added at the mid-plane to reduce the stress. A new, improved design is proposed to eliminate welds between the end-plates and the drum. Research limitations/implications The new proposed design has to be tested in the field to ultimately validate its higher durability. Originality/value The impact of the friction of the belt on the drum is demonstrated. The reinforcement resulting from a mid-plane diaphragm is quantitatively evaluated and assessed. A new improved pulley design is proposed aiming at significantly increased operational life compared to the one of the current design.

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Fatigue in the shell of a conveyor drum

Cited by 7 publications

References 4 publications

Development of a technique for computer simulation of the stress state of the drive drum shell of a belt conveyor to optimize its design parameters

Development of a technique for computer simulation of the stress state of the drive drum shell of a belt conveyor to optimize its design parameters

Analysis of the Drive Shaft Fracture of the Conveyor Belt for Transport of Coal

Finite element analysis and improved design of large-scale belt-conveyor drums

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