Pulleys and pulley sheaves and pulleys are often used in the lifting. 1, pulley sheaves and model from the weight pulleys: Q = 0.1nD2 Q --- safe lifting weight pulley (kg); D --- pulley diameter (mm); d --- pulley number. Pulley applications (illustration) (1) fixed pulley (2) movable pulley (3) guide pulley 2, pulley block (1) effort pulley (2) to wear around the rope and secured with heavy lifting machinery lifting equipment management shall Enterprise chief engineer or factories, mines and long (manager) organizations to develop the use of management system to ensure the safe operation of the equipment. Safety Supervision Organization in lifting machinery by labor administrative departments to conduct a safety inspection every two years. With the "crane safety regulations" standard used mainly "crane design specifications" (GB3811-83), "general overhead crane technical conditions" (JB1036-82), "crane truck crane tire test specifications" (GB6068 -85), "Building tower crane safety regulations" (GB5144-85), "Building tower crane performance test and acceptance" (GB5031-85) and "lift technical conditions" (JB816-74) and so on. Large lifting equipment installation, lifting equipment, Dongying, Shandong trusted by Shandong Lu mechanical equipment installation Limited. Shandong Lu Machinery Installation Co., Ltd. (www.sdlzqz.com) strong, credible, in Jinan, Shandong industrial maintenance, installation and other industries has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Shandong Lu lifting and you work into the brilliant, for a better future!