Today, rigging shackles are used for loading and unloading operations, as well as for transporting goods. Their main purpose is to securely fix and connect parts of lifting devices and mechanisms. Taking into account the serious loads on these products at all stages of their operation, high-quality brackets must necessarily comply with foreign operational norms and Russian standards.
Varieties of products
Staples are classified by material of manufacture, design features, and geometric shape.
There are such varieties:
- U and omega braces;
- under a pin or finger;
- with an additional lock that prevents spontaneous unscrewing of the finger;
- by the presence of a protective coating.
GOST requirements clearly regulate:
- steel grades;
- production technology (forging, cold or hot bending);
- working surface properties;
- location of product marking;
- content and decoding of marking;
- information about the methods of quality control of products;
- subtleties of the process of conservation and subsequent de-conservation.
Selecting the staple size
You should carefully consider the choice of lifting shackles. It is necessary to pay attention to the size of the load lines for which the fasteners are intended. Take into account the thickness of the pin, the sling, as well as the distance between the fixing element and the free section of the cable.
Basic rules for choosing a staple:
- The jaw of the shackle must match the thickness of the slings used. In addition, the thickness of the staple, its overall length, and the length of the inner part are taken into account.
- The shape of the fastener is selected taking into account the maximum design load. Shaped braces are used when additional load securing is required, as well as for complex connections.
- It is important to take into account the maximum permissible load on the fastener, taking into account the technical parameters of the material from which the bracket is made. When choosing, you need to know that relative to the limiting parameters, the real load on the fastener should be 5 times less.
- Signs of corrosion on the surface of the product automatically lead to the write-off of the fastener. Rust-stained lifting shackles are not permitted.
- In terms of service life, it is recommended to give preference to galvanized parts. Staples without additional coating, like painted ones, are less resistant to external influences.
- Rigging elements produced by cold bending have a low safety factor. This must also be considered when selecting fasteners for towing, lifting and moving various loads.
Terms of use and storage
For operation, in accordance with safety standards and requirements, products that do not have visible distortions, as well as rust and other external defects, are allowed.
Separately, you must inspect the head of the finger or pin. It should not have any distortions. Necessarily its tight fit to the supporting lateral surface of the element. The threaded fixing parts must be threaded. If it is torn off, the bracket cannot be used.
In the process of regular use, the parts of the staples that are subject to friction must be lubricated, as well as the grooves of the lugs and pins.
For long-term use, it is important to pay attention to the overall thickness of the product. When wear is more than 10%, the bracket is written off.
Storing rigging staples requires additional lubrication and a dry and well-ventilated area to avoid corrosion. If staples were stored in a warehouse, they must be freed from excess grease and carefully inspected before use.
