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- Holding conveyances during loading/ unloading.
Controlled emergency braking.- Safe transfer of men and materials while loading or unloading of the cage.
- Time saving as re-decking of the cage will not be necessary.
- Rope life on Skip systems is significantly increased due to no shock loading
- No spillage as skip is held in one position during loading.
- Emergency Braking, the system can be adapted to operate as an emergency brake.
The Levelok® system consists of a power pack and clamps which hold a cage or skip steady during the transfer of loads while the clamp is still applied. The clamps then release their grip at a controlled rate to allow the rope stretch to be taken up smoothly.
The Levelok® system has been developed over the last thirty years and is currently being used in mines in southern Africa, North America and Australia. During this time the safety record of Levelok has been excellent. ongoing improvements to the system have ensured that the system is even safer today.
How does the levelok Cage System operate? - When the cage is in position, the station air supply quick coupler is connected to the levelok connection on the cage.
- The power pack (air/oil intensifier) boosts the hydraulic pressure up to the required pressure. The pump stalls and clamp force is maintained indefinitely. This operation usually takes about 10 seconds for the pump to boost the pressure to full clamping force.
- When loading or unloading of the cage is completed, the station air supply is removed, resulting in a rapid loss of air pressure in the power pack. This starts the decompression cycle, which takes about ten seconds.
- As the oil pressure drops, the clamps release their grip at a controlled rate and the cage slides smoothly to its new position in the shaft.
- The clamp arms will then fully retract, thus allowing the cage to be moved
