Using block and tackle and groups which inject public matters?

A pulley and pulley block used, they should pay attention to the following aspects:

     (A) from the weight of the  hoist equipment   generally marked on the nameplate in tackles jacket, non-overload. Pulley for lifting weight is unknown should not be used.
     (2) multi-block from the weight of the door, is worried by the door cars are fine, and if only one part of the pulley, lifting capacity corresponding decline proportionately. If 50t5 door pulley, when only three when lifting weight of 30t,
     (3) should always check the pulleys, hooks, rings of rotation is flexible, loose screws and pulley groove axis, plywood, clapboard and a hook and other parts for cracks or other damage, once problems are strictly prohibited .
     (4) wear around good rope pulley,lever hoist you should tighten the rope slowly afterburner trial hanging, hanging in the trial to check the work of tackles, with or without Kasheng, grinding rope, off the ropes and rope friction between places, found between title should be timely adjusted.
     (5) selection of tackle, to consider the pulley diameter, round bottom width, and the ratio between the rope diameter. General rope diameter pulley diameter should be 16 ^ -20 times the width should be larger than the bottom rope diameter 1-5mm,
     (6) large changes in force or high-altitude operations, should not be used hook block, pulley rings should be used to prevent accidents caused by decoupling.
     (7) when lifting heavy equipment,hoist and trolley should be preferred pair ran head along worn.
     (8) is lifting weights rose to the highest point, the total length of rope around the drum is less than the capacity of towing equipment. And given the distance between the pulley and the movable pulley should be more than safe distance while the rope rope groove angle is not greater than 40-60,
     (9) Put pulley to keep the clean,chain block lubricate moving parts regularly. After each operation, you should tackle cleaned, stored in dry warehouse shelves, to prevent corrosion.