Looking at the lift sector, it gained momentum in Turkey after the 1950s and gradually transformed from a sector structure where needs were met entirely through imports to one where domestic production increased in the areas of assembly and component manufacturing. It has continued to grow and develop, particularly since the 1990s, in response to increasing demand. The lift industry in Turkey must be considered in conjunction with urbanisation and the associated growth of the construction sector. Considering that the urbanisation process in Turkey will continue in the coming period, with earthquake-resistant new buildings replacing old structures, it is inevitable that the lift industry will continue to grow in parallel with the activities of the construction sector.
As one of the leading organisations in the sector, our company, with over 30 years of experience and history, offers high-quality products and services. In addition, we contribute to the lift sector with our high-quality G-FLEX brand lift balance chains, which we manufacture.
As Güven Çelik Halat Ltd.Şti, we prioritize responding quickly to the needs and demands of the elevator industry with experts in the field. We closely follow technological developments and continue to offer high-performance products to the industry.
“We contribute to sectoral development”
Various ropes are used in different lift designs with regard to rope selection for lifts. The selection of the correct rope construction can be achieved through optimisation between the following factors:
• High resistance to rope fatigue
• High wear resistance
• Low elongation
Note: The recommendations stated here apply to a pulley with a V-belt and a 1:1 suspension, and to a machine motor with a D/d ratio of 40.
Rope elongation is one of the most misunderstood terms and causes of confusion. This is because there is no elasticity modulus that can predict the elongation of the rope throughout its service life. The concept of ‘elasticity modulus’ is normally only used in connection with the elongation behaviour of working materials. For this reason, the rope elongation modulus is used for steel rope components.
This term arises in the following situations:
• When the rope needs to be shortened in relation to initial elongation,
• When balancing is performed with the cabin loaded and unloaded to ensure the floor level,
• In the springing of the cabin or counterweight,
• In the acceleration or deceleration of the lift.
Under load, ropes are subject to elongation. Fibre-core ropes elongate more than steel-core ropes. The more compact and robust the rope, the less it will elongate.
Two types of elongation are observed.
a) Structural elongation
This is caused by the settling of the core and the wires within the rope when a load is applied. Most structural elongation occurs shortly after the new rope is put into service.
b) Elastic elongation
This is caused by the application of additional forces such as loading and unloading and/or the acceleration and deceleration of the cabin. The modulus of elasticity, or e-modulus, is an important factor in determining the elongation of a rope. Due to the rope’s helical shape, the modulus of elasticity is not linear when compared to a straight rod. It will vary depending on the applied load. The greater the load, the higher the elastic modulus. There are different approaches to determining the elastic modulus. Depending on the method chosen, the elastic modulus will vary significantly and, consequently, the results for the calculated elongation will vary. The higher the elastic modulus, the lower the calculated elongation. The graph below shows that the typical load range in lift design varies between approximately 2% and 10% of the rope’s minimum breaking force, due to the high safety factors in passenger transport. An elasticity modulus established within this load range is generally lower compared to increasing load ranges, but the expected elongation for each load increase will be higher.
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