Steel belt tensioner is used for lifting or assembling large workpieces at the hook position. Because of the large tonnage of workpieces, complex shape, high value, multiple people working together and other factors, it further increases the operation difficulty and risk factors Therefore, in slinging large workpieces, you should grasp and master the following points: 1. Observe the shape of the workpiece before operation, grasp the location of the center of gravity of the workpiece, and guide the tension Japanese ring tensioner of the workpiece and according to the drawing Confirm the weight of the workpiece. 2. Correctly choose the rope, unloading buckle, hook, tensioner material and other slings. 3. For the workpiece itself, there are rings or lugs specially designed for lifting. It should be checked carefully before operation and should be applied to all rings. 4. If the workpiece itself has no lifting ring, the position of the cable tip should be correctly selected. And align the hook of the crane with the center of gravity of the workpiece. 5. Japanese ring tensioner pay direct attention to the angle between the ropes should generally be less than 90 degrees. 6. In the corner of the workpiece through which the rope passes, the corner protection must be increased. 7. Test suspension process must be carried out before lifting and safety must be confirmed before proceeding to the next step.