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·Transverse cracks can also propagate into the HAZ and base metal In high strength materials transverse cracks can easily develop if preheat and hydrogen level is not controlled and they can appear only in the heat affected Most of such cracks are caused by the longitudinal shrinkage stresses working on low ductile weld metal which is the case in most
·1 Introduction Belt conveyor is an indispensable transportation equipment in coal mine production Conveyor belt is the most accident prone part of the whole belt conveyor [1] [2] During the operation of the conveyor belt gangue anchored bolt and other metal hard objects at the transfer point may scratch and tear the conveyor belt [3] [4] Learn from the
There is a pos sibility to simulate the start up of a conveyor included in a sequence of conveyors that is preceded by an earlier conveyor which drops a load onto the conveyor fig 6
·Conveyors are the means of transportation used in many industries The load bearing and tractive component of a belt conveyor is a conveyor belt which consists of a carcass and cover layers
·stresses induced by hull girder and local loadings include the primary stresses secondary stresses and tertiary stresses Local loading comprises tensile com pressive lateral shear and torsion loadings This complex system of stresses could produce unacceptable deformations and high values of equivalent stresses Most of
·In many situations physical constraints prevent strain from occurring in a given direction For example $varepsilon {z}=0$ in the case shown where longitudinal movement of the long prism is prevented at every point Plane sections perpendicular to the longitudinal axis remain plane and the same distance apart
·In this paper we present a case study of a heavy duty pulley that failed after × 10 7 cycles The pulley was installed as a take up on a continuous conveyor under a load of 350 kN transmitted by the counterweight failure was analyzed using a finite element analysis by Ansys b field data analysis and c fracture macro examination
·Currently the electromagnetic detection method [3] [4] [5] and ultrasonic detection method [6] are the main detection methods for longitudinal tears in conveyor belts Electromagnetic detection method is to embed the induction coil into the conveyor belt using external transmitter and receiver for detection [5] Electromagnetic sensors and coils are
·In addition the conveyor belt longitudinal tear generally occurs because the long bar iron or sheet gangue first rubs against the conveyor belt and then penetrates the conveyor belt [21] When the conveyor belt is wearing the wearing zone generates a lot of heat which radiates outward in the form of far infrared
·The mechanism of propagation of longitudinal dynamic stresses in a conveyor belt the material of which corresponds to the Maxwell model of an elastic element is considered
·The technique offered better real time performance and high accuracy Wang et al [33] proposed a detection method based on sound recognition of longitudinal tearing of conveyor belts Through the
Belt conveyors are used for transporting bulk materials over distances The core of the belt by transferring the longitudinal stresses and ensuring proper frictional coupling of the belt enables
·Pipe conveyors provide sustainable solutions for environmentally sensitive or topographically complex powdered and bulk solid handling processes; however belt rotation is among the most critical
·where σ r denotes the radial stresss σ θ is the circumferential stress τ rθ denotes the shear stress θ is the angle of cracking r and θ are the coordinates under polar coordinates K
·The paper deals with the actual problem of developing the mathematical model of electromechanical system conveyor multimotor electric drive with a frequency converter with the implementation
·The phenomenon is caused by the occurrence of additional motion components due to which the belt escapes towards the edge of the route Under normal conveyor operating conditions the belt run is symmetrical with respect to the longitudinal axis of the conveyor and has correct alignment [56]
·The first part of the equation is the increment of the shear force in the beam along the length of second part describes the force with which the tensioned belt resists the movement of the
·Longitudinal tear of the conveyor belt is a serious threat to the safe operation of the belt conveyor To address this problem a novel approach based on infrared vision for early warning of
·In mining operation the longitudinal tear detection of conveyor belt is of great significance to safety production A novel method named Dual Band Infrared Detection DBID is proposed to detect the longitudinal tear of conveyor belts in this paper The DBID method is based on the collaboration of mid infrared and long infrared vision
Rail stresses can be determined using various non destructive testing NDT methods with the most common being ultrasonic scanning US Recent studies examined the use of the acoustoelastic effect for this purpose [1 2 3 4] Acoustoelastic stress monitoring is based on measuring the properties of elastic waves propagating in strain elastic medium
The value of conveyor belts tension is determined by the dynamic process occurring in belt conveyors which is particularly important in long conveyor belts in which the displacement of the stresses along the belt at the top and the bottom of the traction tension continues beginning from several seconds up to several tens of seconds
·Real time classification of longitudinal conveyor belt cracks with deep learning approach July 2023; PLoS ONE 18 Muck transfer by continuous long conveyor belt method in mountain tunnels
·A novel method named Dual Band Infrared Detection DBID is proposed to detect the longitudinal tear of conveyor belts in this paper The DBID method is based on the collaboration of mid infrared and long infrared vision The DBID sensor device captures the
