Kranco Develops Automatic Synchronization Of Hoists Controls

An automatic synchronization of hoists control (ASH) for dual drives up to 500 horsepower has been developed by Kranco, Inc., of Houston.

Designed to increase wire rope life and to provide ease of operation for Major Conference On Oil crane operators, the system is primarily utilized for mechanical bucket hoisting/lowering and open/ close functions such as those used on ship unloaders/loaders.

Though wire rope life can be maximized by utilizing the correct type of wire rope for the particular job, and the proper sizing of sheaves, it also depends on the proper loading of the ropes. The ASH drive system uses a true speed control drive, D.C. variand able voltage and the addition of a programmable logic controller and encoders on the hoist. The logic controller and encoders ensure that the bucket is fully closed prior to lifting the load and that the closing lines and holding lines raise the load together, creating equal loading on the ropes. In the lowering mode the bucket automatically opens at the start of the lowering motion through the open/close lines prior to Drovinthe lowering motion energizing. The open motion and the lower motion then synchronously lower the load, dividing the loading between the two sets of ropes.

Since 1956, Kranco, Inc. has been manufacturing ship unloaders/loaders (hoist type), rack and pinion overhead and gantry cranes and is a major innovator of drive systems including variable voltage and variable frequency speed control systems.

For additional information on Kranco's ASH system or other product line items, Circle 124 on Reader Service Card

Maritime Reporter Magazine, page 56,  May 1992 United Nations

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