Control the quality of the sling

The quality of lifting products is directly related to the lives of workers. Therefore, no matter what products are used in the production process, quality control must be done. Here we will introduce the three aspects of the lifting belt quality requirements.

First, the material of the tape and the quality of the weaving. The general tape is made of continuous fibers such as polyester, polyester, and polypropylene. The tape should have no obvious defects in the weaving process. The fabric must be knitted using the same material. The standard width of the belt is 25mm, 35mm, 50mm, 75mm, 100mm, 150mm, 200mm, 300mm. The allowable deviation is ±10% when the bandwidth is ≤100mm, and ±8% when the bandwidth is greater than 100mm. The tape thickness should be uniform. When the tape is composed of multiple tapes, the tapes have the same thickness. The colorants, coatings, and coverings of slings should be non-toxic and harmless.

Second, the straps are sewn. The seams should be sewn with the same high-quality thread as the strap material, and the seams should be flat. When suturing, the suture should leave a distance to the width of the tape. The tape with a thickness of no more than 10mm should be left unstitched at 2-4mm, and the tape with a thickness of more than 10mm should not be sutured with a length of 4-8mm. The suture should have a "back seam" treatment at the end, and the length of the "back seam" should not be less than 25 mm.

Finally, the end pieces are formulated. It is a metal fitting attached to a soft loop of a sling, and the inner diameter of the soft loop of the sling that is required to be associated therewith should not be less than 2.5 times the diameter of the end piece. The breaking strength of the end piece metal material should not be less than 4 times the strap's limit working load. The end piece must not be cast.

The above are three aspects of controlling the quality of slings. In addition, describe the common wear damage of lifting straps:

1, deformation and wear. The surface damage caused by vibration and collision is a local wear phenomenon. If the wire rope on the surface of the drum is impacted by other objects, the hoisting wire ropes are wrapped around each other, or the rope is caught due to the skew of the pulley and the center of the drum, the wire rope will be deformed and worn.

2, internal wear. During use, due to the bending of the wire rope, the internal fine steel wires interact to generate slip, the contact stress between the strands and the strands increases, and the localized indentation of the steel wires between adjacent strands is deep and concave, and when repeated cyclic stretching and bending When in the deep recess, stress concentration occurs and it breaks, constituting internal wear.

When we understand the common wear and tear of the lifting belt, we can carry out targeted prevention and treatment. For example, as far as conditions permit, the diameter of the reels and pulleys should be increased as much as possible, and the best constructional lifting belts should be selected, and the sharp corners should be wrapped so as to ensure the safety of operation and prolong the service life.

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