1. Develop a good habit of lifting, plan how to hang, hoist and unload before lifting work.
2. Prepare: Determine the weight and center of gravity of the object to be lifted, carefully read the attached documents, and mark the lifting point and weight data. Only when the center of gravity is determined can the hook be hung in the position of Qiongdang!
3. The crane operator is informed of the weight of the object being lifted.
4. The crane hook should be hung vertically above the center of gravity of the object to be lifted.
5. Lifting and lifting the object should not only damage the lifting object, but also prevent damage to the rigging itself. To avoid rotation or falling, the following conditions should be observed:
a) For single leg rigging, the lifting point should be vertically above the center of gravity of the lifting object.
b) If it is a two-legged rigging, the hanging point should be on either side of the lifting object and the lifting point above the center of gravity.
c) If it is a three-legged and four-legged rigging, the hanging point should be evenly placed at the level of the center of gravity of the lifting object and above the center of gravity of the object to be lifted.
Attention must be paid to the lifting angle β (between the vertical line and the hanging leg): the larger the lifting angle, the smaller the lifting capacity. A lifting angle of more than 60 degrees is absolutely not allowed!
If a three-legged or four-legged chain rigging is used to lift a non-uniformly distributed lifting object, then the rated load of each leg should be calculated from the two leg lifting objects with the highest lifting angle. When the legs have different inclination angles, the lifting load of each leg should be calculated by lifting only the entire lifting object with one chain.
| Model || Standard load (Ton) || |
Test load (Ton)
| Breaking force (Ton) |
| 1.08 || 2.7 || 4.6 |
| 8mm*24mm || 1.92 || 4.8 || 8.1 |
| 10mm*30mm || 3 || 7.5 || 12.6 |
| 12mm*36mm || 4.34 || 10.85 || 18.1 |
| 13mm*39mm || 5.08 || 12.7 || 21.2 |
| 14mm*42mm || 5.88 || 14.7 || 24.6 |
| 16mm*48mm || 7.72 || 19.3 || 32.1 |
Looking for ideal Lifting Chain Sling
With Hooks Manufacturer & supplier ? We have a wide selection at great prices to help you get creative. All the Ring Lifting Spreader Double Hook are quality guaranteed. We are China Origin Factory of One Leg China Slings. If you have any question, please feel free to contact us.
Product Categories : Crane Parts > Crane Rail