SU586106A1 - Method of lifting a load by jib cranes - Google Patents

Description

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The invention relates to the field of lifting and transport engineering and can be used when lifting cargo boom cranes.

There is a known lifting method, which means that the load is lifted with the help of the lifting devices of the cranes.

However, with this: method it is difficult to ensure the synchronism of the cranes.

The closest to the proposed method is that the load is lifted by the load-gripping bodies of the Crane arrows with the help of tackle blocks.

The disadvantages of this method are the uneven distribution of the weight of the cargo between the cranes and the insufficient synchronism of the cranes.

The goal of the survey is to ensure an even distribution of the weight of the load between the cranes and to improve the synchronism of the cranes.

For this, the tackles form a common rope for cranes, and a strut is installed between the heads of the arrows or the load gripping bodies.

FIG. 1 shows the scheme of lifting two cranes with a strut installed between the tips of the arrows; in fig. 2 - the same, with a spacer between the load gripping bodies; in fig. 3 - the same, with struts between the tips of the arrows and the load gripping body; in fig. 4 - the same, with struts between the tips of the arrows and one lifting device; in fig. 5 and 6 - variants of the rope reserve between the blocks of the heads and the lifting devices of the cranes.

Boom cranes 1 and 2 are installed symmetrically on both sides of the lifted load 3. Rope 4 is passed from crane 1 through

the blocks 5 of its lifting body 6 and the blocks 7 of the tip of its boom 8 on the blocks 9 of the tip of the boom 10 and the blocks And of the load gripping body 12 of the crane 2 form two hooks 13, 14. The ends of the rope 4 are fixed on the lifting mechanisms 15 of the cranes. The spacer 17 is installed either between the ends of the arrows 8, 10 of the cranes or between the load gripping bodies 6, 12, depending on the transition point of the rope from the crane to the crane.

To equalize the effect of block resistance on the weight distribution between cranes, rope 4 is passed alternately between the blocks of each of the cranes and diagonally opposite blocks, i.e., the capat between the cranes is passed from the blocks 7, 9 of boom heads respectively to the blocks 11, 5 of load gripping bodies (Fig. 3, 5). When this strut 17 is installed between the tip of the arrows and load gripping bodies.

The rope can be stored in a lifting body 18 common for cranes (Fig. 4).

With the help of slings 19 and the traverse 20, the load 3 is suspended on the load gripping bodies 6, 12. The load is lifted by two lifting mechanisms 15, 16 or one of them. In the second case, the ascent rate of the grzza decreases.

The load between the valves of the distributor is proportional to the number of branches of the rope in the hoists 13, 14. The strut unloads the booms from the additional loads of the inclined directional rope and eliminates deviations of the load gripping bodies.

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Claims (1)

Invention Formula The method of cargo lifting by jib cranes, which consists in lifting the load with the crane-lifting bodies of crane cranes using tackle, characterized in that, to ensure uniform distribution of the weight of the load between cranes and improve the synchronism of crane operation, tackle form a common rope for cranes, and headings arrows or gruzovzahvatymi bodies set strut. 8 7 ff g 8 17 1 IS 7 // eleven