Multi-reel mechanism

Abstract

The invention discloses a multi-drum mechanism. The multi-drum mechanism comprises at least one drum structure and a height limiting detection structure, wherein the drum structure consists of first and second lifting drums and a lifting steel wire rope which is connected between a grab and the first and second drums respectively; the height limiting detection structure is used as a grab height detection and limiting basis according to sum of rope winding and releasing amounts of the first and second lifting drums; the rope releasing amount is a positive value, and the rope winding amount is a negative value; when only a trolley is drawn, one of the first and second lifting drums is used for winding, and the other one is used for releasing, so the sum of the rope winding and releasing amounts of the first and second lifting drums is zero and detection is not required; only when the grab is lifted, the rope is wound or released simultaneously, the rope winding and releasing amounts of the first and second lifting drums are positive or negative simultaneously and detection is performed; meanwhile when the trolley is operated and the grab is lifted, one of two steel wire rope amounts for operating the trolley is positive and the other one is negative, and the two amounts cancel out; the two parts of steel wire rope for lifting the grab are positive or negative simultaneously, the sum of the rope winding and releasing amounts of the first and second lifting drums only relates to the part for lifting the grab and is only used for detecting the steel wire rope of the lifting part.

Description

technical field [0001] The invention relates to a ship unloader, in particular to a multi-drum mechanism of the ship unloader. Background technique [0002] At present, the ship unloader is widely used, because the use of the ship unloader can greatly improve the unloading efficiency, and the minimum dust pollution can keep the environment clean, efficient and environmentally friendly. Among them, the lifting and lateral travel of the grab bucket are the most important operating actions of the ship unloader, and both the lifting and lateral travel of the grab bucket are generally driven by the reel. [0003] For example, Chinese patent document CN2240761Y discloses a four-drum grab control system, which includes a lifting mechanism for lifting and lowering the grab and an opening and closing mechanism for opening and closing the grab. The first and second reels driven by motors and the hoisting wire ropes fixed on the grab bucket and the first and second reels; the opening ...

AI Technical Summary

Problems solved by technology

[0004] In this patent document, when the grab bucket needs to be lifted, the first reel, the second reel, the third reel, and the fourth reel are released or retracted at the same time. Yes, but when the hoisting trolley needs to walk, the first reel and the third reel pay out / take in the rope, and the second reel and the fourth reel take in / out the rope Therefore, it can be seen that the hoisting wire rope is not only used for hoisting the grab bucket, but also for the walking of the hoisting trolley; The height of the hook is detected and limited to prevent the lifting hook from rising beyond the limit position, and the height limiter detects the amount of rope output from the lifting drum. According to the amount of rope output from the lifting drum and the known lifting The height of the lifting hook is calculated by parameters such as wire rope magnification; therefore, when the height limiter in the prior art is used for detection, the calculated rope output of the lifting drum includes two parts: The part of the grab bucket and the part used for trolley walking; so it is incorrect to use the height limiter in the prior art to detect and limit the height of the grab bucket in the four-drum structure described in the control system, that is, Said, the height detector in the prior art can't be used for detecting in those multi-drum mechanisms that are provided with the hoisting drum that not only can lift the grab bucket but also can run the trolley

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