Selection methods and techniques of lifting chain

1) Select the lifting chain, lifting chain structure, including the choice of form and lifting chain diameter OK. First select lifting chain specifications. For example: lifting  heavy objects or wear around the pulleys, lifting chain, optional 6 x37 or 6x61 specifications lifting chain; against wind cable or rope traction rope, optional 6 x 19 specifications of the lifting chain; Working frequent crane lifting line contact should be given priority chain. According to the size of the load carrying and lifting  chains allowable tension, or follow the selection or press the safety factor coefficient C n (detailed calculation see GB/T3811-1983 '"Crane design specifications)) Determine the minimum diameter of lifting chain, lifting chain, different specifications; same diameter as its carrying capacity is not the same 'Finally, Mao also checking the  lifting chain and rope diameter pulley Ih' roll diameter ratio between the lifting chain according to The main technical performance options of lifting chains. Select the length of lifting chain,

When the hook is to be able to meet the minimum operating position, the load chain on the roll at least two safety ring an I ring.
2) load chain wire diameter two are generally greater than 0. 5mmo cranes usually use a nominal tensile strength of 1550 1700MPa lifting chains.

3) According to the wire toughness (ie, the number of bends allowed), the wire is divided into three: Premium allows repeated bending and twisting more times. Toughness best.

For passenger elevators, lifts and cranes, and other large-scale casting; l ( A) level can be repeated bending and torsion of times in general, toughness,

From Guangdong for two general machine; sigh B) grade toughness in general, for the Division Drawstring rope tensioning minor occasions.

4) in the high temperature environment of the crane should be used in high-temperature load chain. Temperature there are two main lifting chain fly, three kinds of asbestos core lifting chain, flexibility and elasticity are better; Another is metal core lifting chain, high strength, can withstand high lateral pressure However,Flexible and less flexible. More commonly used asbestos core lifting chains.

5) in the open air or corrosive gas ring rust should use a lifting chain is made of zinc plated steel wire lifting chain, according to the strength of J corrosion resistance  galvanized lifting chain, points A, B, C. three. This lifting chain except adapt outdoor environment, in a corrosive gas environments Rust.

6) lifting chain according to GB / T 8918-1996 (lifting chain) selection, right in accordance with GB 1102-1974 (round strand lifting chain) production inventory load chain  try not to choose.