DE1756375B2 - Derrick crane, especially for ships - Google Patents

Description

The invention relates to a derrick crane, in particular for ships, with a luffing and luffing on a mast swivel-mounted boom and with two swivel ropes that run on guide rollers at the free end of the Outrigger and are attached to each corner of a triangular plate, at the third corner of the Seesaw rope attacks.

From US-PS 32 60 373 it is already known to couple the pivot rigging with the rocker arm, see above that a sagging occurring in the pivot rigging when the boom is pivoted is absorbed by the rocker rigging by lowering the boom will. The swivel ropes are connected to the luffing rope via a triangular plate. This well-known However, crane has disadvantages, especially when used on a ship. When moving sideways a load hanging on the boom, the oscillation of the load is transmitted immediately to the boom after the end of the pivoting movement and causes it to a side oscillation. The same applies to preventing this undesired movement Serving swivel ropes only run over simple rollers at the upper end of the boom before they are with the Rocking rope are connected, these roles slide unhindered along the swivel ropes and thereby allow the continued undesirable lateral movement of the boom without effective resistance to offer. Furthermore, in the known crane, the boom is counteracted during pivoting subjected to the force component acting on the force of gravity. This allows the well-known crane at Pivoting of the boom become unstable. This is especially true when used on board ships very disadvantageous, because here, due to the heeling of the ship, high tensile forces can also occur in the swivel ropes. These additional burdens then cause an undesirable increase in the boom.

The one from French patent specification 15 11 754 known crane is the length compensation of the swivel ropes also by coupling the Rocking ropes made with the swivel ropes. At the same time, the force occurring in the luffing rope is applied reduced by the fact that the ends of the slewing ropes remote from the boom head are connected to the Seesaw rope are connected. However, this leads to very long and unfavorable pitches. In particular, will

thereby pivoting by at least twice Cables causes and there is no way to attach simple cables for this purpose.

The invention is based on the object of a derrick crane of the type mentioned, in particular re for ships to be trained in such a way that he is on the one hand with simple cable pulls for pivoting the boom and on the other hand even for those on ships frequently occurring, extremely unfavorable conditions due to heeling a stable pivoting of the Boom ensured, in particular makes an undesired increase in the boom during pivoting as low as possible

In a crane of the type mentioned at the outset, this object is achieved according to the invention in that each swivel rope with the interposition of a tackle from the triangular plate over the guide pulley at the free end of the boom to a guide pulley at the free end of the swivel cable and from there back to the free end of the boom and is attached to it

The inventive arrangement of a tackle, the standing part of which is at the upper end of the boom is attached, an additional force component directed in the direction of the swivel rope is achieved on the boom while in the one on the triangular plate

jo attacking part of the tackle only half the rope force compared to the arrangement according to US-PS 32 60 373 is effective in which the swivel rope directly on the Triangle plate is attached The reduction of this rope force and thus the reduction of the

J5 seesaw rope transmitted resulting rope force can be continued by the fact that the rope of each tackle between the swivel ropes and the triangular plate is sheared several times with the luffing rope. So amounts the rope force, for example when using four Roll in the tackle is only a quarter of the time known crane force occurring in the slewing rope. This can lead to uncontrolled lifting of the boom largely prevented. In particular, however, the inventive arrangement of the tackle also a lateral swing of the boom at the end of a pivoting movement of the same as a result of the pendulum of the load hanging on the load rope to a large extent avoided any lateral swinging of the boom from the desired position as a result of the Pendeins Load leads to an increase in the rope force in the slewing rope that is resisting this movement and at least Part of this rope force is transferred directly to the boom through the tackles connected to the boom. Above all, it will reduce the stresses and strains of the Rigging made as little as possible and those on the The load transferred to the seesaw rigging is significantly lower.

The invention is explained in more detail, for example, with the aid of the figures

F i g. 1 the rigging on the jib head of a derrick crane,

F i g. 2 the mast, the boom, the support for the boom and the rigging for luffing, swiveling and handling the load,

F i g. 3 the distribution and the relative magnitudes of the rope forces in the luffing and swivel rigging for the in the F i g. I and 2 illustrated embodiments. The in the F i g. 1 and 2 illustrated embodiment

comprises a mast 1, the boom 2, which can rotate on a pivot or a support near the base of the mast, and the luffing rope D on.

The luffing rope D runs from the luffing winch A to guide rollers 3, 4 and 5 and is then attached to a triangular plate 6, from which the ropes F two towers to two guide rollers 7, each of which is attached to the boom 2, and around further guide rollers 8 and run then attached to the boom at 9. The swivel ropes E run from the swivel winch B over pulleys 10 and are provided with guide pulleys 8 at the ends.

From the winch C , the load rope drawn in dash-dotted lines runs over a guide pulley 11 near the upper end of the mast and over a guide pulley 12 at the upper end of the boom and hangs vertically down in a ready-to-use position.

After rigging a safety rope H is drawn in, one end of which is attached to the triangular plate 6 and the other end to the boom 2 with sufficient passage so that a free movement of the triangle is possible

During operation, the rocking movement, i. H. uie

Movement of the boom in a vertical plane, caused by actuation of the luffing winch A , which

ι the luffing rope D. the guide rollers 3, 4 and 5, the triangular plate 6 and the guide roller 7 acts.

The pivoting movement, ie any inevitable lateral movement of the boom, is brought about by actuating the pivoting winch B , which acts via the H) pivoting cables and the guide rollers 8

As in the force diagram in FIG. 3, for example, a force of one ton on a swivel rope E results in a rope force of V ₂ ton in each of the ends of the \ -, ropes F of the tackles attached to the triangular plate 6 and consequently only a rope force of 1 ton in the luffing rope D. There is therefore no risk of the resulting rope force in the seesaw! during the pivoting process becomes greater than the pivoting force.

For this purpose 2 sheets of drawings

Claims (2)

Patent claims: 1. Derrick crane, especially for ships, with a boom attached to a mast so that it can be luffed and swiveled and with two slewing ropes, which are guided over guide rollers at the free end of the boom and are attached to one corner of a triangular plate Seizing rope engages, characterized in that each swivel rope (E) engages the triangular plate (6) with the interposition of a tackle, the rope (F) of the tackle from the triangular plate (6) via the guide roller (7) at the free end of the boom ( 2) to a guide pulley (8) at the free end of the swivel cable (E) and from there back to the free end of the boom (2) and is attached to this (at 9) 2. Derrick crane according to claim 1, characterized in that the rope (F) of each tackle between the Schvsnkseilen (E) and the triangular plate (6) with the luffing rope (D) is shorn several times.