The safety requirements for lifting tables are raised by the latest revision of standard DIN EN 1570-1:2011.
Photo: Behind the scenes of Theatre Genoa: SITEMA Safety Locks mounted directly on the hydraulic cylinders to clamp the piston rods
The latest revision of standard DIN EN 1570-1:2011 raises the safety requirements for lifting tables. Here, SITEMA clamping units offer a safe and simple solution to prevent lifting tables from falling down or sinking unintentionally.
According to the standard, all lifting tables must be equipped with a supporting device which enables safe maintenance and repair works underneath the table. This device must be able to carry not only the table itself, but also the nominal payload. Furthermore, it must be possible to install it from a safe position.
All these requirements are met by the SITEMA Safety Lock KRG.
Safety Locks are designed to hold static loads or to clamp slow movements typical for lifting tables.
They are kept open by hydraulic or pneumatic pressure and clamp when the pressure is released. The clamping is initiated by springs, but the actual clamping force is created by the weight of the downward moving load itself with the help of a conical self-reinforcing clamping system.
This principle of self-reinforcing clamping guarantees a very high level of safety, as it is impossible that the clamping system will open under load. To release the clamping, the load has to be lifted, which automatically fulfils the requirement of the standard that the supporting device must not be removed until the lifting table is supported by the drive.
The characteristics of SITEMA Safety Locks at a glance:
– Safety clamping system which can only be opened when free of load
– For static or slowly moving loads
– Admissible loads of 40 tons and more per unit
– Monitoring by inductive proximity switches
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