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What is a chain suspension?
In the world of lifting means, chain suspensions form the connection between the sling and the load. They are made up of several components. Suspensions can be purchased fully configured – depending on the weight, size and shape of the load.
The components of a chain suspension are:
- the master link.
- the chain (in one or more strands).
- the end component (e.g. hook).
- any connecting elements (to connect two chains).
- any shortening elements (to shorten chains).
- any additional elements (e.g. balancer).
If you assemble suspensions yourself, you may only use lifting chains. Lashing chains are not permitted for lifting applications, as they have a different safety factor to lifting chains.
The standards DIN EN 818, DIN EN 1677 and E DIN 21061 guarantee a maximum of safety in the manufacture of chains. Lifting chains that are approved and tested in accordance with these international standards are authorised by the German Social Accident Insurance (DGUV) to bear the so-called H-stamp. Do you value quality and safety? Then check whether your lifting chain has an H-stamp.
Every lifting chain is given an identification tag by the manufacturer, which must be permanently fixed to the chain. Among other things, it provides information on the WLL, the nominal diameter and the grade. If this tag is missing, you must not use the chain, since important characteristic values of the chain – and thus of the suspension – cannot be determined. VIP and ICE identification tags from RUD also serve as chain gauges.
For lifting chains, the safety factor 4 is required by law. This means that the manufacturer must prove that the breaking strength of the lifting chain is at least four times its working load limit (WLL).
Incidentally, since wire cables and textile lifting means have a lower elongation under load and thus a lower energy absorption capacity than lifting chains, higher safety factors (5 or 7) apply to them.
Configuration of a chain suspension: what questions do you need to answer in advance?
1. What load (weight) is to be lifted with the chain suspension?
The most important factor that you need to be aware of when choosing the components.
2. How many strands should the suspension have?
This depends on the lifting options that are present on the load.
3. Which usable length should the suspension have?
It depends on the hall height, the application height and the size of the load.
4. How big is the distance to the lifting points used?
It has an effect on the angle of inclination β of the suspension.
5. Where is the centre of gravity of the load?
Symmetrical and asymmetric shapes place different requirements on the suspension used.
6. Does it make sense to use an endless chain?
It can, for example, be used if a load does not have any lifting points.
7. In which working environment should the suspension be used?
Extreme operating temperatures or harsh environments require special materials –
e.g. RUD VIP or ICE components.
Attention! According to DIN EN 818, all the components and lifting chains in a suspension must always have the same nominal thickness and the same grade (do not combine ICE and VIP). In addition, components from different manufacturers must not be combined for safety reasons, as the connection systems sometimes differ considerably.
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Grade 120 (ICE = Innovative Chain Evolution):
- Same WLL with smaller nominal thickness than Grade 80.
- Chain dimension from 4 – 16 mm.
- WLL from 0.8 to 35 t.
- ICE-PINK powder coating.
- Extremely temperature resistant from –60 °C to +300 °C.
- Heat indicator (change from 200 °C)
Grade 100 (VIP)
- 30 % higher WLL than Grade 80.
- Chain dimension from 4 – 28 mm
- WLL from 0.6 to 126 t.
- VIP-PINK powder coating.
- Extremely temperature resistant from –40 °C to +380 °C.
- Heat indicator (change from 200 °C).