What determines the load force of high-strength lifting belts


At present, the scope of application of slings in the industry is very wide. It is widely used in shipping, metallurgy, machinery, mining, petroleum, chemical, port, electric power, electronics, transportation, military and other fields. Synthetic fiber slings are generally made of high-strength polyester filaments, which have multiple advantages such as high strength, wear resistance, oxidation resistance, and ultraviolet resistance. At the same time, they are soft, non-conductive, and non-corrosive (without any harm to the human body). Synthetic fiber slings have the advantages of light weight, easy maintenance and good chemical resistance, as well as excellent characteristics such as light weight, high strength, and not easy to damage the surface of hoisting objects. Wire rope rigging. There are many types of slings. Conventional slings (according to the appearance of the sling) are divided into four categories: annular core, annular flat, double eye core, and double eye flat.

The bearing capacity of each type of sling is different, so what determines the load capacity of the high-strength lifting belts?

The sewing method of the synthetic fiber sling affects the load force of the sling:

The sewing thread of the sling should leave a space at the edge of the sling, leaving a 2-4mm unstitched position, and a synthetic fiber webbing with a thickness greater than 10mm should leave a 4-8mm unstitched position. The sling should have overlapping sutures, and the suture should have a beginning and an end, and the stitching must be completed. In addition, the final suture of the synthetic fiber webbing must be processed later to prevent the suture from falling off and affecting the use of the sling.

The lifting method affects the load force of the synthetic fiber lifting belt:

Lifting heavy objects is to choose a correct lifting method according to the shape of the object and the environment. It is not a few tons of lifting belts for objects of several tons. Different lifting methods will directly affect the load force of the lifting belt. Common hoisting methods include vertical hoisting, knotted hoisting, 45-degree hoisting, and U-shaped hoisting capacity of the hoisting method = method coefficient Px rated load. We set β as the hoisting angle. When the sling is used vertically, the maximum working load that can be achieved is the rated working load; when the sling is knotted, the maximum working load is 8 times; when 7B<45, the larger working load The working load is 14 times the rated load: when 45°<B<60, the maximum working load of the sling is 10 times the rated load. When the loading method is U-shaped, the maximum load can reach 2 times the rated load.

The hoisting angle affects the load force of the high-strength synthetic fiber sling:

Different lifting slings require different hoisting angles during loading and unloading. For example, the length of the lifting lug used by the flat lifting strap should not be less than 3.5 times the thickness of the hook of the contact part of the lifting lug, and the movable angle of the lifting lug should not exceed 20°. When the sling and the lifting appliance of the sling soft lug are attached, the contact part of the sling and the lifting appliance must be the same, unless the axial width of the sling does not exceed 75mm, and the bending radius of the lifting attachment must be at least the axial width of the sling. 0.75 times the width.

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