GINDIN: продукция Drumet (Друмет) в России

Above picture presents swaged steel wire ropes having different level of cross section compression. From left side - light level of cross section compression, centre - medium typical compression, right side - high cross section compression. Terms regardingwire ropes Nominal rope diameter - d [mm] - theoretical rope diameter, expressed with the value rounded to the integer. This value is used for rope specification and description, when placing an inquiry, issuing the certificates, and for rope strength calculations. Actual rope diameter [mm] - the rope diameter obtained as a result of rope diameter measurement by means of the proper measuring instrument - the slide calliper or micrometer gauge with proper jaws. The actual rope diameter is measured by measuring the diameter in two planes vertical to each other, two measurements for each plane. The results of measurement are averaged, and the average calculated is the actual rope diameter. In case of doubts, measurement of the rope under the load is allowed. Correct way of rope diameter measurement by means of the slide calliper Incorrect way of rope diameter measurement by means of the slide calliper Diameter tolerance - permissible nominal rope diameter deviation - permissible dimensional range of deviation of actual rope diameter measured for the rope without the load, defined by relevant standards DIN Standards for rope diameters >/= 8.0 mm specify the diameter tolerance from 0 up to 5 %, ISO Standards from -1 up to +4%. There is no technical possibility to produce the rope, for which the actual diameter is equal to the nominal one. Minimum Breaking Force [kN] - the value corresponding to the guaranteed breaking force, the value required in specific standards, which the rope producer must comply with strictly. The breaking force is measured at the tensile testing machine. Also, some standards use the calculated breaking force, which, depending of the standard, is determined empirically, by multiplying the rope metal cross-section value by the strength of rope wires. Rope Tensile Strength grade [MPa] - the level of required rope strength, for which the value of breaking force is defined, the strength levels (classes) are defined as 1770, 1960, 2160, etc. The rope strength class corresponds directly to the tensile strength T.S. of wires used for rope production, which is expressed as the ratio of the wire breaking force to the wire cross-section. The rope strength class does not have to correspond to wire strength strictly (for example, the standards allow the wire manufacturing deviation within the range of +350 MPa, that is, the actual strength of the wire, for which the strength class is 1770 MPa, may have the strength within the range of 1770 - 2120 MPa). Depending on the wire strength, the values of rope breaking force and stiffness change. Nominal weight of 1-m rope section [kg] - the weight of 1 metre section of the rope as determined in the relevant standard as the result of theoretical calculations. Actual weight of 1-m rope section [kg] - the weight obtained as the result of measurement. Wire laying pitch in the strand (as well as - strand closing lay in the rope) - the distance, at which the same wire (strand) repeats, when laying the wires (strands) around the central wire (rope core). The pitch is marked with the letter "h".