Grab Swing Control Method for Rope Pulled Trolley Crane

Abstract

In a rope trolley crane provided with a crane body (4) that includes sea leg (2) and a land leg (3), a girder (5) and a boom (6) that are disposed to the crane main body (4), a trolley (7) that traverses above the girder (5) and the boom (6), a bucket (12) that is positioned downward of the trolley (7), first and second hoist drums (20, 22) and left and right hoist ropes (9a, 9c) that raise and lower the bucket (12), and first and second opening and closing drums (21, 23) and left and right opening and closing ropes (9b, 9d) that open and close the bucket (12), the present invention includes, when the bucket (12) is swinging in the travelling direction, lowering the hoist rope (9a or 9c) on the front side in the travelling direction, and raising the hoist rope (9c or 9a) on the rear side in the travelling direction. It is by such a configuration that the present invention achieves the advantageous effect of smoothly reducing the swinging of the bucket (12) in the travelling direction.

Description

technical field [0001] The invention relates to a method for controlling the swing of a grab bucket in the traveling direction in a rope-drawn trolley crane. Background technique [0002] When loading and unloading bulk cargo located near the side of the hold by a rope-drawn trolley crane (hereinafter referred to as "unloader") that unloads bulk cargo such as ore and coal loaded on a bulk carrier, In the case of the so-called grab material grabbing operation where the grab bucket is lowered in the direction of travel of the machine. [0003] However, if the grabbing operation of the grab is carried out towards the direction of travel of the unloader, since the grab point of the grab deviates from the lifting point on the trolley in the direction of travel of the unloader, it is difficult to lift and grab the bulk cargo. When grabbing, the grab swings in the direction of travel of the unloader. This swing is not easy to stop, so it takes extra time for unloading, and the ef...

AI Technical Summary

Problems solved by technology

[0003] However, if the grabbing operation of the grab is carried out towards the direction of travel of the unloader, since the grab point of the grab deviates from the lifting point on the trolley in the direction of travel of the unloader, it is difficult to lift and grab the bulk cargo. When grabbing, the grab swings in the direction of travel of the unloader

The swing is not easy to stop, so it takes extra time when unloading, and the efficiency is reduced

[0004] When the grab swings in the direction of travel of the unloader, conventionally, the unloader is moved in the direction in which the grab swings to prevent the grab from swinging, but the unloader is heavy (e.g., 800 to 2,000 tons), and The travel speed is low (for example, about 30m / min), so it is difficult for the unloader to move back and forth in a short distance in the direction of the swing of the grab bucket, and the swing of the grab bucket is not easy to stop, and it takes extra time before stopping

[0005] On the other hand, there is known a 4-drum type rope-pulled trolley crane composed of 2 hoisting drums and 2 opening and closing drums (for example, refer to Patent Document 1), but this invention is used to perform grabbing on a trolley. The invention of anti-swing in the direction of traverse, but the anti-swing of the grab bucket in the direction of travel has not been disclosed

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