Vacuum cups age over time and lose their load-bearing capacity
Fillers migrate to the surface, other substances from release agents and coatings enter the surface and this changes the friction factor of the vacuum cup. The result is a reduction in the load-bearing capacity and thus the supposed safety of the vacuum lifting device. This is independent of the manufacturer of the vacuum cup.
You cannot tell by looking at a vacuum cup what it can really carry. Without a load test, it is not possible to assess the load-bearing capacity of a suction cup.
We, as well as Wood's from the USA, recommend replacing the suction cups every two years, unless the load test shows a different result. And then all suction cups should also be replaced so that the vacuum lifting device has its specified load capacity again.
You can see how this manifests itself in the load test in the following videos.
Simply click on the link and the video will open on an internet-enabled PC.
Why do the suction cups on vacuum lifters need to be replaced?
- Example on a Kappel vacuum lifter DSZ2/12V
Why is the load test so important during maintenance?
- Example on a Kappel vacuum lifter DSZ2/12V
Here you can also look at individual tests with teats of different ages, perhaps you will then understand why it is so important for Your safety and the safety of others is to replace the suction cups from time to time.
Find it on YouTube:
Tensile test with a new suction cup 388
Find it on YouTube:
Tensile test with a suction cup 388 that is 5 years old
Find it on YouTube:
Tensile test with a suction cup 388 that is 10 years old