GINDIN: продукция Brunton Shaw (Брантон Шо) в России

performance ropes for elevators TECHNICAL INFORMATION 7 Drums, Sheaves and Pulleys These should be cast iron or steel and have smoothly finished machined grooves with rounded edges. Regular inspection of grooves and pulleys and examination of ropes for correct relative contact and wear is of the utmost importance, especially in the face of ever-increasing shaft speeds. Minimum Drum/Pulley Diameters The ratio between the pitch diameter of sheaves, pulleys or drums and the nominal diameter of the rope, irrespective of the number of strands, shall be as follows:- Discard Criteria for Lift Ropes This table indicates the maximum number of visible broken wires in the worst section of rope that can be allowed, taken over one complete lay length or approximately 6 rope diameters. Discard should not only be determined by wire breaks, other factors such as irregular wear patterns, excessive stretch, reduction in diameter, localised damage corrosion etc. must be taken into account by the competent person when making a thorough examination. Note that a rope with a diameter reduction of 6% or more of the nominal diameter should be replaced immediately. For further information refer to ISO 4344, BS EN 12385 or contact our Field Services Department. Care and Maintenance of Elevator Ropes Before ropes are installed the sheave grooves should be checked for wear. Worn grooves cause rope damage. This precaution is especially important when worn ropes are being replaced as the grooves may have become worn by the old ropes to a size which is too small to adequately accommodate the new rope. All the ropes on an installation should be equally tensioned, BSUK recommends tensioning between ropes of ± 10%. Unequal tensions result in unequal wear, slipping and premature rope failure. In a new installation, all foreign matter, stone, dust, cement etc should be removed before the ropes are installed. Lubrication is critical in achieving optimum rope performance, it reduces friction between component parts of the rope, slows the onset of fatigue and helps prevent ’rouging’, however, too little and rope life can be reduced, too much and slip may develop. All BSUK lift ropes are lubricated during manufacture to ensure they contain the correct type and quantity of lubricant for the application. The quantity of lubricant for traction drive ropes is carefully controlled to prevent slip. Depending on the conditions under which the rope is operating however the lubricant applied during manufacture may not last the life of the rope. Periodic lubrication may therefore be necessary however care should be taken to ensure that the coefficient of friction is not reduced below the value at which slip will occur. Excessive amounts of lubricant should be avoided. Before re-lubricating the rope should be cleaned to remove any debris and contaminated lubricant. After re-lubricating BSUK recommends that rope tensions are checked and adjusted where necessary. For At Least Suspension ropes 40 Compensation and Governor Ropes 30 Replace or examine within a Condition specified period as stated by Discard immediately a competent person Class 6x19 Class 8x19 Class 6x19 Class 8x19 Broken wires randomly distributed >12 >15 >24 >30 around the strands Broken wires predominate in 1 or 2 strands >6 >8 >8 >10 Adjacent broken wires in one strand 4 4 >4 >4 Valley breaks 1 1 >1 >1