Method for controlling the orientation of a load suspended from a bearing wire about said bearing wire and a winch arrangement

摘要

A method for controlling the orientation of a load (18) suspended from a bearing wire (16) about said bearing wire (16), comprising the following steps:a.—providing a winch arrangement (10), comprising; one master winch (32), one slave winch (34) and a winch control system (31), each of said winches (32, 34) having a winch motor (58) and a bi-directional rotational spool (54) with a tagline (40, 42), wherein the winches (32, 34) are placed on the ground, on the crane or on the load, wherein each tagline (40, 42) is provided with attachment means (44, 46) for attachment to the load (18) and for applying a controlled torque to the load (18) about the bearing wire (16), and wherein the control system (31) comprises tension sensor means (48) for determining tagline tension and spool rotation sensor means (50) for determining spool rotation, and wherein the control system (31) is controllably connected to each winch motor (58) for controlling spool rotation,b.—connecting the attachment means (44, 46) to the load (18),c.—simultaneous rotating the winch spools (54), until preset tagline tensions are sensed in the two taglines by the tension sensor means (48),d.—during horizontal and/or vertical movement of the load (18), rotating, if necessary, the spools (50) with a rotation speed, for maintaining a desired orientation of the load (18), based on the determined tagline tensions,e.—relieving the tagline tension by rotating the spools (50), andf.—disconnecting the attachment means (44, 46) from the load (18).