Experimental determination of force acting on a sandwich conveyor’s pressure roller in transport of bulk materials for the needs of failure analysis

Hrabovský, Leopold; Molnár, Vieroslav; Fedorko, Gabriel; Tkac, Jozef; Frydrýšek, Karel

doi:10.1016/j.measurement.2022.111832

Cited by 12 publications

(6 citation statements)

References 32 publications

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“…A PC (ASUS K72JR-TY131 laptop) was connected to the DS NET strain gauge using a network cable with RJ-45 connectors at both ends. The time record of the measured F Mi [N] driving force was displayed on the PC screen in the DEWESoft X2 SP5 software environment [9], see Fig. 6.…”

Section: Experimental Measurement and Proceduresmentioning

confidence: 99%

Detection of movement resistance and friction coefficient in the transport of building materials and construction materials

Hrabovský

2024

MATEC Web Conf.

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In the production of building materials and construction materials, continuously operating conveying equipment is commonly used, including roller conveyors. Roller conveyors are devices designed for horizontal, slightly ascending or descending transport of piece products moving on a system of rotating rollers of different shapes (cylindrical, conical, disc, pulley or according to the profile of the conveyed object). The rotating rollers are placed in the track frame (supporting structure), which can be either stable, relocatable or adjustable (height and length adjustable, so-called scissor conveyors). An analogue of the roller conveyor is the pulley conveyor, where instead of rollers, discs - pulleys are mounted on a non-rotating axis. Several discs are installed on the axis with gaps. The pulleys on adjacent axes overlap so that there is no continuous gap. The track is used for handling flat building parts and objects such as metal sheets, glass panes, furniture parts, etc. When transporting item building materials or bulk building materials placed in storage boxes which are transported on a powered roller track on pallets, a driving force is required depending on the angle of inclination of the roller track, the weight of the load, the number of rollers on which the load rests and the coefficient of shear friction during movement. The paper presents a laboratory device that has been designed to detect the adhesion force during the transport of piece loads by a roller conveyor. On the implemented device, it is possible to determine in laboratory conditions the amount of resistance to the movement of the load on the driven roller conveyor depending on the weight of the load. The paper presents measured values of the shear friction coefficient during the movement of a steel storage box on a driven roller track. In this paper, a driven roller track is used for laboratory tests, where the drive of the rollers is implemented by so-called short chains. In addition to horizontal tracks, this chain drive allows you to drive rising tracks with variable gradients or even rising curved tracks.

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Section: Experimental Measurement and Proceduresmentioning

confidence: 99%

Detection of movement resistance and friction coefficient in the transport of building materials and construction materials

Hrabovský

2024

MATEC Web Conf.

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“…5a) can be divided into two volumes V 21a [m 3 ] and V 21b [m 3 ] see the relationship (8). (9). The surface size S yz (x) [m 2 ] according to Fig.…”

Section: Introductionmentioning

confidence: 99%

“…On the frontal board 1a using bolts 4, there is a slider mounted 3 (movable in z-axis), simulating a cleat. Loose material [9] was gradually evenly spread along the entire length l c of the cleat (slider 3) with known height H c , parallel to the horizontal plane. Maximum height y (3), or y(z) (12), for the option displayed in Fig.…”

Section: Introductionmentioning

confidence: 99%

The geometric shape of the transported material batches in the vertical branch of a belt conveyor

Hrabovský,

Blata

2024

MATEC Web Conf.

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Transport above the limit angle of transport inclination provided using belt conveyors can be done in several ways. If we omit the methods based on an increase in the contact force of the transported material in relation to the surface of the conveyors belt and increase in the coefficient of friction, we will focus only on the method based on the principle of preventing the movement of the transported grains on the surface of the conveyors belt. This principle uses transverse cleats that prevent the movement (sliding or rotation) of material grains along the entire length of the conveyor belt, which is inclined at a high angle to the horizontal plane. Material grains are transported on the surface of a conveyor with cleats, distributed with a regular spacing along the entire length of the endless loop of the conveyor belt. To prevent material grains from falling of such a belt, corrugated sidewalls are fitted on both edges of the conveyor belt. This paper describes two variants that take into account the mutual position of the cleats in relation to the corrugated sidewalls. For each of the variant, the relationship is given with which it is possible to analytically quantify the volume of the bulk loose material batch that is spread over the area of the cleat in the vertical section of this conveyor belt design. The results of the measured values concerning the height of the loose material pile that were taken using laboratory instruments are listed in the tables and compared with the theoretically calculated values. Key data that must be known to calculate the pile height, and the volume of the transported material batch represent the exact value of the angle of repose for the loose material. The angle of repose of a particular loose material does not acquire a constant size, as it changes from its maximum (static angle of repose) depending on the shaking, flattening or absorbing liquid to its minimum (surcharge angle). The paper presents geometric shapes of batches for the transported material used for both limit values of the angle of repose.

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“…In conveyor operations, it is not easy to measure the evenness of the transported material (Hrabovsky et al, 2022). In complex mining environments, conveyors often experience damage, such as overloading (He et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Investigation the maximum load capacity of the tail-shaft on the apron feeder using Solidwork simulations

Hidayat

Primawati

Myint

2023

jerel

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The tail-shaft is one of the components of the apron feeder on the conveyor. Its role is quite significant, as it includes a take-up system to adjust the tension and slackness of the chain on the sprocket against the Lamella. Based on observations in a mining industry, it was found that tail-shaft damage frequently occurs, likely due to the excess load carried by the conveyor. Therefore, researchers were interested in investigating the maximum capacity of the tail-shaft. The research was conducted using the Finite Element Analysis method with Solidworks Research License. The material used for the tail-shaft is DIN 1.0038. Torque variations tested on the tail-shaft were from 42,000 N.m to 58,000 N.m. Based on the simulation results, the maximum torque that the tail-shaft can withstand is 54,000 N.m with a safety factor value greater than 1, whereas when given a torque of 58,000 N.m, the safety factor value is less than 1. The tail-shaft experiences a maximum stress that exceeds the yield strength of DIN 1.0038 material, which can cause damage to the material. The initial damage appears at the end of the shaft due to the use of chamfer. This is known based on the results of simulations that have been conducted.

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Experimental determination of force acting on a sandwich conveyor’s pressure roller in transport of bulk materials for the needs of failure analysis

Cited by 12 publications

References 32 publications

Detection of movement resistance and friction coefficient in the transport of building materials and construction materials

Detection of movement resistance and friction coefficient in the transport of building materials and construction materials

The geometric shape of the transported material batches in the vertical branch of a belt conveyor

Investigation the maximum load capacity of the tail-shaft on the apron feeder using Solidwork simulations

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