Multi rope friction lifting equipme

Multi rope friction lifting equipment realizes the lifting and lowering of materials through the friction between steel wire rope and friction wheel. The total load is mainly composed of materials, containers, steel wire rope (head rope) and balance rope (tail rope). These loads make a certain specific pressure between steel wire rope and friction wheel, and ensure sufficient friction to realize the lifting and lowering of load. While ensuring the normal and stable operation of the lifting equipment, the tail rope will cause the tension in the steel wire rope to change alternately with the position of the lifting container (or counterweight), which will cause alternating stress amplitude. With the increase of well depth and lifting load, especially for ultra deep wells, the length and self weight of the first victory and end of the lifting wire rope will greatly increase, resulting in the increase of the specific pressure between the first rope and the friction wheel pad. Limited by the strength and wear resistance of the material itself, the safe operation of the lifting system can only be ensured by sacrificing the lifting capacity of the hoist, which will reduce the lifting efficiency and increase the production cost. The increase of tail rope length greatly increases its quality, resulting in more serious problems - the increase of alternating stress amplitude of lifting steel wire rope, which aggravates the fatigue wear of steel wire rope, can not ensure the fatigue life of steel wire rope, and even cause major safety problems such as wire and rope breakage. Therefore, the multi rope friction hoist scheme for ultra deep wells does not have engineering feasibilityFeasibility.