Energy-independent vacuum lifter
Energy-independent vacuum lifters use the load weight or the load to generate the vacuum . The largest devices that work according to this functional principle achieve load capacities of up to 7000 kg.
history
The first devices of this type were introduced to the market in 1967.
functionality
The vacuum lifter is lowered until it touches the load. When lowering further, a piston sinks inside the vacuum lifter and displaces the air from the vacuum space, which escapes through an open valve. So that the valve closes, the crane hook is lowered until the chain hangs loosely. The switch is activated in the pull rod and the valve is automatically closed. When the load is lifted, the “vacuum space” is created under the piston, which is sealed at the top by the roll collar (rubber seal). The greater the weight of the load, the higher the vacuum. The vacuum level shows the vacuum level reached. If the vacuum is stable, the load is lifted and is held securely under the vacuum lifter during transport. To set down the load, the crane hook is lowered after the load has been placed until the chain is relieved. The automatic switchover opens the valve, air flows into the room, the vacuum lifter detaches from the load and is ready for the next transport. The vacuum lifter always switches automatically from ' sucking ' to 'releasing' and vice versa.
application areas
Energy-independent vacuum lifters are only suitable for the horizontal transport of smooth, air-impermeable loads. The load may only be transported horizontally (max. Permitted incline 6 °). Typical examples are metal sheets, plastic sheets, glass panes, painted furniture parts, etc.
safety
Energy-independent vacuum lifters must be equipped with a warning device that reports a vacuum drop by means of optical or acoustic signals. As a rule, the warning device is supplied by a battery, as the energy-independent vacuum lifter does not have an external energy supply (for functionality, see above).
Individual evidence
- ↑ Technical Committee CEN / TC 147 "Cranes - Safety": Cranes - Safety - Loose load handling devices; German version EN 13155: 2003 + A2: 2009 . Beuth Verlag GmbH, Berlin.