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Frequency Kobelco cranes parts conversion adjusts

11:42, Sun 6 Jul 2008 .. Link
Frequency Kobelco cranes parts conversion adjusts the practical application of speed technology on the bridge type hoist

A foreword
    The hoist  Hydraulic pumpshas extensive application in the industrial and mining enterprises, is mainly used for realizing the rise or fall of the object and transshipping. Oxidize the bridge type hoist of packing shop of providing and delivering department of the aluminium trade, a set of apparatus enters every day, appears to oxidize aluminium aluminium powder amount and reaches more than 2000 tons, it is frequent to use, the work load is enormous, and the environment is abominable (corrode the dust alkalinely) . It influences the completion of production efficiency of packing shop and task directly whether the bridge type hoist could work normally, even concern the security of the rights of the person, apparatus.

Proposition of 2 questions

The system of pulling of the bridge type hoist used in packing shop of providing and delivering department adopts the winding the line type and exchanges the asynchronous motor, bunch enters multistage outer resistance to adjust the speed in grades, adopt the controller of the cam, the relay - contactor hydraulics parts to control in the rotor return circuit, this kind adjusts speed way and realizes being simple, but there are a great deal of shortcomings:
(1) Rotor clusters of speed of transferring of resistance of winding the line etc. mechanical characteristic soft, transfer speed to be performance poor;
(2) It is that a has grade to adjust speed way that the bunch of resistance adjusts the speed, switch over through what fen of the contactor are finished to the rotor series resistance jointly, thus adjust the rotational speed of the electrical machinery, will bring the unavoidable impact to the mechanical parts of the electric wire netting and overhead traveling  Kato genuine cranes partscrane while carrying on the resistance and switching over;
(3) Adopt the touching device of positive and negative switching to realize the electrical machinery in the main return circuit reversingly, the operator, in order to adjust the working state of the bridge type hoist in practical operation, adopt transposition apply the brake frequently ,Switch over electric current to be heavy, contactor and electrical machinery work in bad condition, overhaul of the equipments maintain expense  Japan construction machineries partsto be very much high;


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