分类： IT业界
2013-09-25 16:03:21
A wire rope
1 rope specifications are more commonly used for lifting works : 6 × 19 1,6 × 37 1,6 × 61 1 three. Among them, six coiled rope represents the number of shares , 19 ( 37,61 ) indicates the number of wires per share , a representative of the middle of the hemp core .
2 In the same diameters , 6 × 19 1 maximum diameter of the wire rope in high strength but poor flexibility . The 6 × 61 1 steel wire rope in the most detailed , flexible, but low intensity .
3 In lifting projects, generally used to make wind cable wire rope sling ropes and pulleys run , wind cable rope safety factor of not less than 3.5 , so ran the rope pulley safety factor is generally not less than 5, do sling safety factor is generally not less than 8, if used to carry , the safety factor is not less than 10 to 12.
4 rope tension T required calculations : theoretical formula : T = P / K where : P - breaking strength (MPa) national standards or manufacturer's data. K - factor of safety .
Second, the pulley
1 pulley specifications H xxx × xxx represents the first pulley H is H series , the second part of the three figures , which means that the pulley of the rated load, the third part ( after the first multiplication portion ) is two numbers , which means that gate count , the last segment is the English literal , which means that structure. Structure Code : G - Hook ; D - rings ; W - lifting beam ; L - chain link ; K - opening ( guide rollers ) , and was silent as H80 × 7D + K said: lifting pulley , rated load of 80t, 7 doors, closed -type rings .
2 pulley block selection according to the following steps: ( 1 ) According to Analysis and calculation to determine the pulley load Q Select pulley rated load and the number of gates ; ( 2 ) calculate the pulley running rope pull S0 and choose to run rope diameter ; ( 3 ) Note rope diameter must be selected to run with the pulley match ; ( 4 ) ran the rope under maximum tension S0 and orientation angle calculation guide wheel load and select the guide wheels .
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