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在起重吊装中,钢丝绳主要用作走绳和拖拉绳。所谓走绳,就是穿绕滑车组的、用于提升重物的钢丝绳。拖拉绳又称桅索,用于保持扒杆的垂直位置。走绳和拖拉绳的计算,在起重吊装中是重要的一环,通常可从有关的参考书和手册中查出各种计算用的系数,但是不了解其基本原理时,往往会发生错误。走绳要穿绕定滑车和动滑车,一般是以滑车组的轮数和吨数来命名。例如“7-6轮100吨”滑车组,表示定滑车组为七轮,动滑车组为六轮,最大负荷为100吨的滑车组。滑车组由滑轮构成,单滑轮的受力情况如图1。其主动一侧的绳拉力 P 要比从动一侧的绳拉力 P_1为大,这是由钢丝绳的刚性和滑轮的
In the lifting hoisting, wire rope is mainly used as walking rope and tow rope. The so-called walking rope, is to wear around the pulley group, used to enhance heavy rope. Drag the rope, also known as the mast cable, used to maintain the pole vertical position. The calculation of running and towing ropes is an important part of hoisting and hoisting. Usually, various calculation coefficients are found out from the relevant reference books and brochures, but mistakes often occur without knowing the basic principles . Rope to go around the fixed tackle and moving tackle, usually based on the number of rounds and tons of tackles to name. For example, “7-6 rounds of 100 tons” block group, said the block set for the seven-wheel, moving block group of six, the maximum load of 100 tons of the pulley group. The pulley block is made up of pulleys. The stress of single pulley is shown in Fig.1. The rope tension P on the active side is larger than the rope tension P_1 on the driven side due to the rigidity of the wire rope and the