PFEIFER SEIL- UND HEBETECHNIK GMBH Wire ropes – Technical information DR.-KARL-LENZ-STRASSE 66 DE-87700 MEMMINGEN PHONE +49 (0) 83 31-937-301 FAX +49 (0) 83 31-937-123 E-MAIL [email protected] INTERNET www.wi

Wire ropes – Technical information Moving means to set things in motion, to unfold dynamics, to create things. For us in the PFEIFER group, to move is very specific: it means that with our products from Wire Rope Technology, Rope and Lifting and Building Systems elevators, heavy loads on cranes, sheet metal coils, workpieces and precast concrete elements move. Our cable structure buildings are known all over the world, and so is our extensive knowedge l on the dynamics of wire rope in all applications. Moving also means for us that we don't sit still, we study, we learn, we apply and we invest....

Content Through the right choose of ropes and end terminations in accordance with their operating conditions you achieve the most economic lifetime, reduce potential risks and avoid high downtime costs on the basic of premature rope failure. Well-know manufacturers of cranes and building equipment, as well as fleet operators and users, trust in PFEIFER know-how. Rely on our years of experience! Wire ropes – a story of success . . . . . . . . . . . . . . . . . 4 Technical aspects about wire ropes Components of wire ropes . . . . . . . . . . . . . . . . . . . 5 Rope cores . . . . . . . . . . ....

Wire ropes – a story of success Historical review When Wilhelm Albert, an official of the German Board of Mines, manufactured a steel wire rope in 1834, it was admittedly not the first wire rope in the world, but the tools he used and the level of wire production enabled him to produce ropes of acceptable length and quality. The ensuring rapid development of wire rope production and its machinery and an ever increasing number of new rope con tructions revealed, how urgently wire ropes were needed s by the emerging industrial revolution. Since then the very simple Albert rope construction has...

Technical aspects about wire ropes Components of wire ropes Single wires spinned to a strand (fig. 1) Strands surrounding the core (fig. 2) Rope cores The inner part of a single layer rope surrounded by the outer strands is normally filled by a rope core. Its main function is to support the outer strands and, by using a steel core, also to increase the load bearing metallic cross ection. s Overview of material and construction: 3 The core of the rope consists of There are two typical types of steel core natural (NFC) or synthetic fibre (SFC). 1. ire strand core (WSC) W Fibre cores (fig. 1 and...

Strand constructions Differentation of moving ropes JJ S tandard stranding method (fig. 7) Standard stranding methods cause wire crossings between the wire layers within the strand resulting in high stress concentrations, where crossings occur. Premature damage may be the consequence. stranding method (fig. 8) All wires are arranged parallel in the strand structure thus a continous linear contact is provided. The result is a reduction of compressive stress of the wires. Therefore many of our special ropes for running service are made of p arallel stranded strands. Different lay type of outer...

Rope types Single layer stranded ropes Single layer round strand ropes (fig. 17) consists of several strands laid in one layer around a fibre or steel core. They are applied in cranes, excavators, winches, construction machinery, elevators or are used as sling ropes. Rotation resistant ropes Rotation resistant ropes designed to generate reduced levels of torque and rotation when loaded (fig. 18). Rotation resistant ropes generally comprise an assembly of at least two layers of strands laid helically around a core, the direction of lay of the outer strands being opposite of that of the underlying...

Surface treatment of wires Rope lubrication Wire surfaces Lubrication tasks bright (U) Uncoated ropes are marginally softer and more flexible than galvanized ropes and offer economical advantages for long lenghts. F riction reduction Lubrication of wires and strands reduces the destructive friction between the single rope elements. galvanized (B) Galvanized ropes are more insensitive against penetrating water and humidity than bright ropes. These ropes can be used in different applications and machinery. P rotection against corrosion Special rope lubricants prevent an infiltration of humidity...

Rope selection Various main applications Wire ropes are divided into four main groups: Slings Track ropes … for load handling ropes. … re used in forest applications. a Structural cables Running ropes … re ropes being anchored at two a fixed points and do not run over sheaves or spool on a winch, e. g. guy and pendant ropes, suspension ropes. … re ropes running above sheaves, a drums or traction sheaves, e.g. hoist ropes, luffing ropes, elevator ropes, haulage ropes etc. The most suitable rope for a given application is the one best able to withstand the conditions the rope will encounter in...

Rotation resistant or non-rotation resistant rope? Rotation resistant ropes Rotation resistant ropes generate reduced levels of torque and rotation when loaded. 1. otation resistant ropes R These are rope constructions, e. g. 18 x 7, 17 x 7 (fig. 18), with two layers of strands laid helically around a core, the direction of lay of the outer strands being opposite to that of the underlying layer. WARNING! Don’t use these ropes attached to a swivel or have one or both ends rotate freely under load! If this is not observed serious injury, considerable damage or death will occur! Exception: Considering...

Right-hand or left-hand lay rope? For the installation of ropes on winches there is the basic rule: JJ JJ Right-hand lay rope for a left drum Left-hand lay rope for a right drum For the correct running of the rope it is necessary that drum and reeving will be of the same direction. If a rope runs from a right drum into a left reeving or from a left drum into a right reeving only a test can prove whether a left-hand or a right-hand lay rope must be installed. By using multiple layer spooling systems we recommend to follow the above mentioned basic rule. Rope lay direction How to determine the...