Research, Production and Use of Steel Ropes, Conveyors and Hoisting Machines

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Authors: Jozef Krešák, Pavel Peterka, Stanislav Kropuch, Andrea Bérešová
Abstract: A rope is an important, highly effective and one of the oldest transportation systems used in transport by mankind. Nowadays, steel ropes are mainly used for moving loads in mining - coal and ore exploitation, vertical or horizontal transport of persons and goods by cranes, elevators, lifts and cable ways. In many cases steel wire ropes are employed in extreme conditions with respect to the load of the rope: high temperature plants, mining corrosive environments and etc. In terms of labor safety it is necessary to certify each rope people come in contact when working with loads or a rope is used for transportation. It has to be done earlier than a rope is put into operation or on the market. Despite the fact the tests were performed correctly, a rope may not achieve the desired rope life. The great impact on the life of a wire rope has its interaction with a device a rope is deployed on. Interaction of a steel wire rope with a device it is deployed on has a great impact on its life. Durability is also affected by the way a rope is loaded, its maintenance and regular re-examination as well as its construction. Design accuracy is assessed according to strength and deformation properties of wires a rope is made of and a rope cross-section construction is taken in account as well. The important aspect of steel wire rope durability (which can be mostly influenced by a manufacturer) is an appropriate design of diameters and angles of wires winding in accordance with exactly defined conditions of operation. The paper presents models of ropes equally loaded which eliminates the most unfavorable factors affecting their life cycle.
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Authors: Tomasz Rokita, Wacław Oleksy
Abstract: The article presents the basic technical requirements for carrying-hauling ropes for monocable aerial ropeways contained in the Directive 2000/9/EC of the New Approach of March 20th 2000 on cableway installations designed to carry passengers and in European Standards harmonized with it. These requirements apply to materials used for ropes, methods of manufacturing of wires and ropes, physical parameters, mechanical properties, testing methods and rope discarding criteria. The article summarizes the different types of loads in carrying-hauling ropes for monocable aerial ropeways and their impact on the operation of the cableways. It also touches the subject of the properties of carrying-hauling rope constructions with equal lay and compacted strands used in ropeways in Poland in the last two decades with particular emphasis on the structure of cores made of plastics. An analysis and assessment of the rope operation has been carried out in the last part of the article. This analysis considers factors such as the rope construction, the method of carriers gripping, lay direction of rope related to the direction of ropeway movement, rope elongation depending on the type of core and the associated rope shortening and rope fatigue life.
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Authors: Peter Bindzár, Martin Straka, Thomas Thate, Michal Balog
Abstract: The Aviator is a floor-free working warehouse vehicle, which gives a third alternative to the market of stacker cranes that consist also of the narrow aisle stacker and the rack feeder. Officially introduced as Transfaster in 2002, this full-automatic working system has been realized several times. This article will give an overview concerning the structure of the system and its functionality, and will compare it to conventional systems regarding advantages, disadvantages and performance. Therefore ways of calculating cycle times are introduced.
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Authors: Ján Boroška, Alena Pauliková, Vladimír Ivančo
Abstract: Modulus of elasticity of steel wire rope (elastic modulus) is a characteristic value, which is important not only for users of the steel rope, but also for designers of machines and machinery that are equipped with the steel wire rope. Values of the elastic modulus depends predominately on the elastic modulus of the material, which the rope is manufactured from as well as it depends on the various other factors. The most important influencing factors are as follows: rope construction, type of core, angle and way of wire stranding, angle and way of rope lay as well as kind of lubricant. The real value of the elastic modulus has also impact on prolongation of the steel wire rope and on intensity of its dynamical loading. The rope elastic modulus value can be determined by means of the various methods. There are analysed in this article such methods for determination of the rope elastic modulus, which can be applied for a computer simulation.
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Authors: Jozef Kuľka, Martin Mantič
Abstract: Article discusses the pusher wagons in transhipment complex. In terms of the reliability of this device appears to be the weakest link in the transhipment of bulk substrates operated rotary tilter because of its design causes increased wear of the rope. The mode of handling the rope through the properties is an ideal solution for transport of the wagons, which led to finding ways to extend its life. This contribution is proposing a design method for a possible modifications of the pusher with an expected minimum costs and there are calculated the load characteristics of the rope before and after adjustment of the device.
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Authors: Janka Šaderová, Andrea Rosová, Peter Bindzár, Peter Kacmary
Abstract: The paper gives an example of selecting a suitable type of steel wire rope for selected transport device. The selection of steel wire rope was performed by selected method on the basis of multi-criteria evaluation. The criteria for evaluation of selected types of ropes were chosen in the way to take account of ropes parameters and the operating conditions of the transport device.
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Authors: Pavel Peterka, Jozef Krešák, Stanislav Kropuch, Andrea Bérešová, Dušan Mitrík
Abstract: At present the need of nondestructive testing of rope bridges state appears often. Modern maintenance trends using non-destructive checking allow to detect the state of these materials in service without breaking their integrity. From the point of view of so far used non-destructive testing methods the area of cable end is not accessible. The magnetic properties research of these materials and the subsequent design of new structures for scanning elements will enable non-destructive monitoring of the state of the ropes steel material of static constructions, especially their anchoring. The article aims to present the results from tracking of the magnetic flux around the cable end and signal runs from particular designed and investigated scanning elements placed above artificial defects created closely to the cable end.
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Authors: Jerzy Kwaśniewski, Tomasz Krakowski, Hubert Ruta, Szymon Molski, Marek Pypno, Krystian Ratuszny
Abstract: Application of compact ropes made of area-contact wires in new types of hoisting installations operated at deep levels 1300 [m] and in smaller bucket hoists allows for reducing the drum size in the winder machine and the diameters of the rope pulley, thus prompting the optimization of their size and weight. Inspection of such ropes (BRIDON Dyform 34 LR, 18, 20, 25, 42 [mm] in diameter manufactured by Drumet) after an 8-years’ service by magnetic methods does not reveal any wearing and hence new diagnostic methods need to be developed or the existing ones improved. In consideration of stress concentrations, the working conditions of ropes needs to be determined whilst in service, particularly in tapered grips in rope attachments. This study summarises the diagnostic method employed to determine the working condition of ropes in tapered grips and describes the diagnostic equipment being currently developed, intended for inspection of rope condition in attachments.
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Authors: Ivo Drahotský, Václav Cempírek
Abstract: Article is aimed at quality and safety management in logistic buildings. Article focuses on possible views on these questions in relation to warehouses and manipulation techniques. Important issues include HR management – operating staff, their quality and qualification directly influences quality and safety of processes. The Article is divided into parts: analysis of current status, legislation and suggestion of further possible views helping to increase quality and safety.
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