Crane cell portable (load moment limiter) automatically disable the lifting mechanism and the mechanism of luffing (the taps fitted with such a device), if the mass is intended to raise the load exceeds the capacity of the crane on the set value, and thereby prevent overloading the crane and possible accidents involving with overdrive. Overloading can cause tap breakage ropes and hooks, hoist parts breakage, cracks in structures and the complete destruction of the crane. Most often due to an overload fall (overturned) mobile cranes jib type: road, track, , rail, tower, gantry. Therefore, the rules provided for equipment mobile jib and trailer, tower (including Extra and jack) and gantry cranes load limiters. Cranes bridge type should be equipped with load limiters that can overload the crane due to technical reasons. These cranes primarily should include magnetic and grab, which can overload technology work they do.
Load limiter is installed on the main hoist mechanism. CDB jib crane for ICG-25BR developed additional restraint on auxiliary hoist.
Load limiter (load moment limiter) should automatically disengage the lifting and luffing in the case of lifting the weight of which exceeds the load capacity by 10% and have jib tower cranes, 15% for gantry cranes, 25% for bridge type cranes. Disable other mechanisms, such as rotation or movement, not necessarily.
Load moment limiter must also act if lowering the boom cargo flight will be extended to a situation in which the mass of the load exceeds the permissible value.
After the action of the load moment limiter should be possible to lower the load or the inclusion of other mechanisms to reduce the load moment.
Jib cranes equipped with additional supports, arrows of different lengths, or both, ie, having two or more load characteristics, can be supplied with a load limiter device, switching it to work on the selected characteristic: extra poles or without them, with normal or elongated boom, etc.
Setting limiter for cranes with mechanical (non-electric) power is allowed without the executive device (disconnecting the engine) body with exposure to the beep.
For mobile jib cranes early releases to be written off in the near future, as well as for foreign firms cranes installation requirements of the load moment limiter will be charged.
Among the completed device structures are distinguished: mass constraints that are triggered when lifting the load limiting mass (they are used on roadways and jib cranes with lifting capacity for all permanent departures arrows);
Load moment, triggered in the event of overturning moment to increase the limit value (they are installed on the crane cell portable, load capacity which varies depending on the luffing).
Surge masses usually consist of a force sensor and actuator (tripping) body. We load moment limiter, in addition there is a corrective device that automatically sets the start limiter activation depending on the set luffing and load corresponding to this departure.
On the device sensors, sensing and balancing action on tap efforts distinguish spring, trucks, torsion and other constraints.
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