Bulk-cargo grab bucket with high grabbing ratio

Abstract

The invention discloses a bulk-cargo grab bucket with high grabbing ratio. The grab bucket comprises two petals of bucket bodies arranged symmetrically, two pieces of main reinforcements which intersect at a hinging point and are connected fixedly, a conductor rope frame, a pair of movable pulleys, a pair of bucket-opening ropes and a pair of bucket-closing ropes, wherein the conductor rope frame and the two pieces of the main reinforcements are connected fixedly in the position of the hinging point; the pair of the movable pulleys are arranged inside corresponding bucket bodies and connected with bearing rods inside the corresponding bucket bodies fixedly; first ends of each bucket-opening ropes are connected with a lifting rope of an external crane respectively, and second ends of the bucket-opening ropes bypass the corresponding movable pulleys respectively and are connected with the upper part of the corresponding main reinforcements; first ends of the bucket-closing ropes are connected with an open-close rope of the external crane, and second ends are wound for a plurality of circles along two exterior common tangents of the pair of the movable pulleys and connected with the corresponding bucket bodies on the sides of the ends. The bulk-cargo grab bucket is extra large in the grabbing ratio, and the invalid load of the grab bucket is reduced greatly; and the dead weight of the grab bucket is low, the structural strength is high, and the energy consumed by overcoming the dead weight of the grab bucket is saved greatly, so that the discharging efficiency is improved greatly.

Description

technical field [0001] The invention relates to a bulk cargo unloading grab tool, in particular to a bulk cargo grab with high grabbing ratio. Background technique [0002] The grab is an important pick-up tool used to grab the goods. It is widely used in port loading and unloading operations, especially in the field of grabbing bulk cargo, such as coal loading and unloading, ore loading and unloading, etc. At the same time, the grab can also be used It is an operation tool for bulk grain unloading. [0003] In the prior art, grabs are divided into loading and unloading grabs and salvage or dredging grabs according to their uses. The lifting capacity of the loading and unloading grabs is not large: generally between 5 and 80 tons; Large, it is mainly used to clean up channel silt; and the loading and unloading grab has a relatively large lifting capacity, because unloading requires a certain operating efficiency. At present, the grabbing ratio of the largest grabbing bucke...

AI Technical Summary

Problems solved by technology

At present, grabs usually use long pole grabs for ship unloading operations, especially bulk cargo grabs. The target of unloading operations is bulk carriers, which need to provide a huge grab ratio to unload bulk carriers. The grab ratio has a certain limit, and it cannot be higher after reaching a certain level. At present, the maximum grab ratio of the long pole grab is 1:2.0, and it is already difficult to increase the grab ratio. This requires changing the grab The type of grab can further improve the grab ratio of the grab; while the scissor grab has a simple structure and a large grab capacity, but its structural strength is relatively large. How to improve the grab ratio while ensuring the safety of the grab itself , it must be ensured that the structure of the grab itself can withstand the impact of the load under a large grab ratio

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