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Storm brakles, also called rail clamps, are used to protect cranes and rail-bound equipment to reliably secure them against unwanted movement and drifting (e.g. storm).
RFT developed and improved their standard storm brake type VZFH and included a lifting and positioning function. New RFT design type: VZFH-HVZ (patented).
The new design do NOT have any contact to the rail during crane travel. In general most existing wear on storm brakes, which will be guided as standard on the rail, happen during crane travel and not during the clamping action of a storm brake.
Therefore RFT upgrated their standard version with a lifting system. That means the complete clamp system is lifting up until min. 10 mm above the rail head. No guide rollers will be used anymore to guide the storm brake on the rail during crane travel. Very often the clamp jaws grind down the rail during crane travel due to strong rail misalignments. An other reason for extreme wear can be the increased speed of crane systems. Speed of more than 80 m/min is very fast for using standard storm brakes which will be guided on the rail during crane travel. These negative influences and wear can not happen anymore by using the new design VZFH-HVZ, especially by installation in high speed crane systems.
The patanted positioning function gurantees a perfect lowering solution of the storm brake, also in case of rail misalignments. Lateral positioning of +/- 25 mm is given (more on request). Restraining / holding forces up to 840 kN will be achieved and a self acting closing function in case of emergency is integrated as standard.
The new storm brakes is also especially suitable fast crane systems (crane speed of 300 m/min) and for transverse travels.