scholarly journals Problems and solutions in the operation of belt conveyors in the river port RTC Luka Leget

2021 ◽  
Vol 27 (1) ◽  
pp. 1-8
Author(s):  
Dragan Živanić ◽  
Atila Zelić ◽  
Mirko Katona
Keyword(s):  
Conveyor Belt ◽  
Normal Operation ◽  
Separation Plant ◽  
Actual Force ◽  
Problems And Solutions ◽  
Belt Conveyors

The paper presents a case study of gravel transshipment in RTC Luka Leget in Sremska Mitrovica, R. Serbia. Problems that led to the incorrect operation of conveyors used in the transshipment of gravel from barges to the separation plant were analyzed. They included activation the safety switch of the conveyor drive, backward movement of the material on the belt, fracture of the connection tension pulley - axle, etc. It was found that ignorance of the actual force in the conveyor belt leads to most of the problems and the need of a solution for this problem was highlighted. At the end, proposed solutions were given in order to establish the normal operation of the plant and to prevent delays in gravel transshipment.

Logistics Activities in Vietnamese Retail Enterprises: Problems and Solutions

2019 ◽  
Vol 35 (3) ◽  
Author(s):  
Dang Thi Huong ◽  
Vu Thi Minh Hien
Keyword(s):  
Qualitative Research ◽  
Research Methods ◽  
Qualitative Research Methods ◽  
Problems And Solutions

Logistics is one of the important factors to ensure the availability of goods, promote retail businesses to deliver and consume goods quickly. However, logistics in Vietnamese retail businesses is identified to be limited, reducing the efficiency and competitiveness of enterprises. Using qualitative research methods (observation, document synthesis, interview, case study), the paper pointed out some problems in logistics activities of Vietnamese retail businesses; at the same time, analyzed experience in logistic activities of Vinmart store chain. Based on these results, the paper proposed some useful solutions to improve the logistics activities and enhance the competitiveness of Vietnamese retail businesses in the context of integration.

Case study 3

2018 ◽  
Author(s):  
Ewan Ferlie ◽  
Sue Dopson ◽  
Chris Bennett ◽  
Michael D. Fischer ◽  
Jean Ledger ◽  
...  
Keyword(s):  
Health Care ◽  
Public Services ◽  
Management Consulting ◽  
Organizational Redesign ◽  
Management Consultants ◽  
Management Knowledge ◽  
Problems And Solutions ◽  
Financial Interests ◽  
The Way

The chapter discusses management consultants and consulting knowledge in health care, highlighting significant expenditure on consultancy and how consultants have shaped thinking in public services, which some critics suggest has served consultants’ own (financial) interests. The chapter then discusses the way consultants mobilize management knowledge and frame clients’ problems and solutions. It discusses an empirical case study of a consultancy project to redesign NHS organizations to make substantial ‘efficiency savings’. Here, consultants framed the NHS’s problem and solution, and then imposed an organizational redesign. Local NHS managers and clinicians framed the NHS’s problem differently, doubting the consultants’ framing and proposing redesign, but feeling unable to engage in dialogue about these concerns. Consequently, they engaged with the project in a calculated and defensive way, superficially accepting the redesign while waiting for its implementation to fail. Thus, the chapter demonstrates framing politics surrounding management consulting knowledge.

scholarly journals Conventional Selection of Mechanical Fasteners for Flat Belts

2021 ◽  
Vol 11 (7) ◽  
pp. 2916
Author(s):  
Karol Konecki ◽  
Dominik Wojtkowiak ◽  
Krzysztof Talaśka ◽  
Andrzej Kołodziej ◽  
Grzegorz Domek
Keyword(s):  
Conveyor Belt ◽  
Minimum Diameter ◽  
Fabric Composite ◽  
Mechanical Fasteners ◽  
Problematic Issue ◽  
Mechanical Fastening ◽  
Materials Used ◽  
Belt Conveyors ◽  
Mechanical Fastener ◽  
The Right

Due to the variety of materials used for flat belts of belt conveyors and the further development of material engineering in relation to these belts, the methods of their connection become an increasingly problematic issue. The belts can be connected mainly in three ways: vulcanized (weldable or heat-weldable), glued or mechanically. The latter method is one of the simplest and most universal in terms of the material variety of belts; however, there are many design variations of mechanical fasteners, and each of them has a certain advantage in a narrow group of properties, e.g., the thickness spectrum of a conveyor belt, the minimum diameter of a drive roller or the range of transferable longitudinal loads. The objective of this paper is to analyze the design solutions of commercial mechanical fasteners used mainly for flat rubber-fabric, composite or plastic belts. To fulfill this goal, a preliminary analysis of the stress distribution for an exemplary solid mechanical fastener was carried out in two cases: during ramp-up and during circulating around the roll, followed by a detailed review of commercial solutions available on the market. In addition to determining the current state of knowledge and technology and determining the state of ignorance, special algorithm and design maps have been created, thanks to which the process of selecting the right mechanical fastening will be easier. The overview includes several tables with detailed information on individual connection properties. Additionally, several design aspects were derived, within which individual mechanical connections may differ. This is to enable the generation of customized solutions in the future by proposing an appropriate mathematical model, on the basis of which it will be possible to generate optimal design properties for a given application.

scholarly journals Modelling mechanical properties of the multilayer composite materials with the polyamide core

2018 ◽  
Vol 157 ◽  
pp. 02052 ◽  
Author(s):  
Krzysztof Talaśka ◽  
Dominik Wojtkowiak
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
High Strength ◽  
Conveyor Belt ◽  
Complex Model ◽  
Multilayer Composite ◽  
Thermosetting Polymers ◽  
Wide Range ◽  
Belt Conveyors ◽  
Polyamide Film

Due to the wide range of application for belt conveyors, engineers look for many different combinations of mechanical properties of conveyor and transmission belts. It can be made by creating multilayer or fibre reinforced composite materials from base thermoplastic or thermosetting polymers. In order to gain high strength with proper elasticity and friction coefficient, the core of the composite conveyor belt is made of polyamide film core, which can be combined with various types of polymer fabrics, films or even rubbers. In this paper authors show the complex model of multilayer composite belt with the polyamide core, which can be used in simulation analyses. The following model was derived based on the experimental research, which consisted of tensile, compression and shearing tests. In order to achieve the most accurate model, proper simulations in ABAQUS were made and then the results were compared with empirical mechanical characteristics of a conveyor belt. The main goal of this research is to fully describe the perforation process of conveyor and transmission belts for vacuum belt conveyors. The following model will help to develop design briefs for machines used for mechanical perforation.

scholarly journals Coal Flowability Control on Preventing Spillage on Conveyor Belt Through Modeling and Simulation for Improving its Performance

2021 ◽  
Vol 90 (1) ◽  
pp. 130-145
Author(s):  
Sabri Bahrun ◽  
Mohd Shahrizan Yusoff ◽  
Mohamad Sazali Said ◽  
Azmi Hassan
Keyword(s):  
Bulk Material ◽  
Extraction Process ◽  
Conveyor Belt ◽  
Underground Mines ◽  
Mining Site ◽  
Dem Simulation ◽  
Conveyor System ◽  
Average Production ◽  
And Performance ◽  
Belt Conveyors

Belt conveyors are generally used in mining plant areas, both surface and underground mines. The belt conveyor is mainly applied to transport the extracted bulk material from the mining site to delivery. The effectiveness of the extraction process depends on the reliability and durability of the conveyor belt system. In addition, conveyor performance is very important specially to control material flowability to prevent spills or other operational disturbances to optimize production throughput. However, the transfer chute and settling zone can cause some problems during the transfer process, such as material spills. This problem can reduce the function and performance of the conveyor belt. This paper discusses a design model to reduce the problem of spillage in the settling zone. The model was developed by compiling the previous defecting data from the durability of the conveyor system, then analyzed using Discrete Element Method (DEM) software and compared with bulk characteristics. The initial performance of certain conveyors is only capable of serving with an average production of 76% of the designed capacity while energy is consumed at full load. By applying the DEM simulation result, the blade gate can reduce the peak angle break in the depositional zone before exiting. After the analysis is completed using DEM, the conveyor increases the average production to 95% of the designed capacity. In conclusion, controlling the maximum belt load without spillage will reduce interruption on conveyor belt operation and maintenance costs therefore increase plant reliability and availability.

scholarly journals How to overcome hypogalactia? Prevention and successful management of hypogalactia

2019 ◽  
pp. 21-24
Author(s):  
Article Editorial
Keyword(s):  
Practical Significance ◽  
Psychomotor Development ◽  
First Year ◽  
Successful Management ◽  
Ministry Of Health ◽  
Clinical Case Study ◽  
Problems And Solutions ◽  
The Republic ◽  
Medical University

In October 2018, a symposium for neonatologists and pediatricians «Child of the first year. Problems and Solutions» was held in the framework of the 17th Russian Congress «Innovative Technologies in Pediatrics and Pediatric Surgery». The problem of breastfeeding of newborns and its importance for the proper and harmonious development of the child was raised along with such relevant topics as the dynamics of the psychomotor development of prematurely born children, practical significance of findings of neurosonography, comprehensive assistance to children with disabilities. Report on the topic «How to overcome hypogalactia? Clinical case study, prevention and successful management of hypogalactia» was presented by Zhdanova Svetlana Igorevna, Cand. of Sci. (Med.), a neonatologist, the Republican Clinical Hospital of the Ministry of Health of the Republic of Tatarstan, Assistant of Chair of Hospital Pediatrics with a Course of Outpatient Pediatrics in Kazan State Medical University of the Ministry of Health of Russia.

scholarly journals Technological and organizational problems in the construction of the radiation shielding concrete and suggestions to solve: A case study

2021 ◽  
Vol 11 (1) ◽  
pp. 1122-1129
Author(s):  
Aleksandra Radziejowska ◽  
Joanna Sagan ◽  
Anna Sobotka
Keyword(s):  
Occupational Safety ◽  
Construction Materials ◽  
Radiation Shielding ◽  
Health Administration ◽  
Supply Logistics ◽  
Problems And Solutions ◽  
Analysis Of Alternatives ◽  
Heavyweight Concrete ◽  
The University

Abstract Protection of buildings against the pernicious radiation types can be achieved by simultaneous structural and shielding parameters. Those shields are mainly made of heavyweight concrete, which causes many serious problems in the areas of technology, supply logistics, financial supply, Occupational Safety & Health Administration, and substitutions of structural and material solutions. This work presents a case study of the construction of the university building with rooms requiring protection against malicious radiations. Apart from that, it presents the problems and solutions that occurred during the construction from the perspective of the works contractor. This study was also expanded to include the analysis of alternatives for construction-materials. The obtained results were used to develop a generalized scheme, which will be helpful in the preparation and implementation of any facilities requiring fixed radiation shields.

scholarly journals Experimental tests of the impact of selected parameters on the indentation rolling resistances

2018 ◽  
Vol 29 ◽  
pp. 00002 ◽  
Author(s):  
Dariusz Woźniak ◽  
Lech Gładysiewicz ◽  
Martyna Konieczna
Keyword(s):  
Main Part ◽  
Rolling Resistance ◽  
Experimental Tests ◽  
Conveyor Belt ◽  
Significant Component ◽  
Different Types ◽  
Indentation Rolling Resistance ◽  
Belt Conveyors ◽  
The Impact

Belt conveyors are main part of transporting systems in mines and in many other branches of industry. During conveyor belt works different types of resistances are generated. Indentation rolling resistance is the most significant component of the resistances from the perspective of energy losses and it cause the biggest costs as well. According to latest state of analyses and measurements it is well known that theoretical rolling resistance were underestimated in comparison with the measured in-situ one. In this paper new method for determination indentation rolling resistance is presented. The authors compared theoretically and experimentally established damping factors. The relation between these two values enabled to obtain more precise equation for damping function. This function is one of the most important component in calculation of the rolling resistance. In new theoretical model value of rolling resistance is nearly twice higher than this used so far.

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