SU734133A1 - Tower crane - Google Patents

Description

(54) TOWER CRAN

one

This invention relates to cranes.

The famous tower crane containing a foot boom with a cargo trolley interacting with a cable, a boom rascal connected to a boom pulley, one of the branches of which is attached to the drum of the boom winch Sch.

A disadvantage of the known crane is that significant loads act on the boom.

The purpose of the invention is to reduce the loads acting on the boom.

To achieve the goal, the truck is equipped with additional cable blocks, which are attached to the boom of the boom, attached to the head part of the boom, and one end of the rope is attached to the drum of the boom winch from the side opposite the branch of the boom pistil

turret and connected with the head part of the boom.

In addition, a friend from the vetzia jib can be stocked through the head of the tower and connected to the head of the boom.

FIG. I schematically depicts the described tower crane, common to FIG. 2 and 3 - variants of the schemes of ropes reloading of the boom suspension system

10 and change departure.

Tower crane (Fig. 1) contains the tower 1 with ogottovkom, mounted on a turntable 2, mounted on the chassis frame 3.

A horizontal beam boom 4 is pivotally attached to the upper end of the tower 1, along which the load carriage 5 moves, carrying the hook suspension 6.

On the turntable 2, a counterweight 7 is mounted to the winches, the boom 8 and the cargo 9, the rope 1O of which is stocked through the bypass blocks 11 onto the hook suspension 6 of the cargo

trolley 5 and mounted on the head of the boom 4,

Cargo trolley S (FIG. 2) is suspended on the boom raft 12, the cable blocks 13 installed on it, and connected to the trailing pulley 14, running from the side of the boom support Rope 15 tons of the pulley pulley 14 wound up on an equalizing drum 16 of the boom winch 8 from the side of the opposing branch of the rope 17 of the arrow of the chain hoist 18.

In view of the difference in the laws of the change in the length of the boom and traction hoists. when the trolley is loaded horizontally, the leveling drum 16 of the boom winch 8 is made with sections of different diameter and configuration for each of the ropes 15 and 17

When working with a cargo, its weight is distributed through the trolley 5 between the branches of the boom rammer 12, which stretch the boom polyspast 16 on one side, and the boom 4 is compressed on the other side, and the force transmitted by the races twisted 12 on the trolley 5 and directed to the head of the boom 4,

Thus, the boom 4 lies loosely on the trolley 5 and perceives only the compressive forces from the boom ramming branches 12 fixed to the head part of the boom

The change of departure of the trolley 5 is made by turning on the boom winch 8.

As the overhang is increased, the truck 5 moves along boom 4 as a result of reducing the boom policy of the paste 18, one of the branches of which (rope 17) is wound on the equalizing drum 16 of the boom winch 8, and the simultaneous extension of the trailing pulley 14, the rope 15 of which winds up from the equalizer drum 16.

The overhang is reduced in reverse order by changing the direction of rotation of the drum 16, wherein the bending loads on the boom

from the own weight of the boom, as the level of departure is reduced, the free branch of the rope 14 (fig 2) or boom 18 (fig. 3) pulley hoist

through the head of the tower 1 and connected to the head part of the arrow 4 "

The linearity of the movement of the truck, trolley 5 and the preservation of the horizontal boom 4 when changing the departure is ensured by appropriate selection of the diameters and configuration of the sections of the equalizing drum 16o

Claims (1)

Invention Formula 0Is A tower crane containing a tower head, a beam boom with a cargo trolley interacting with a haul rope, a boom boom, connected to a jib boom, one of the branches of which is attached to the reel of a boom winch, characterized in that loads, truck trolley is equipped with additional cable blocks, -bending boom raschalom fixed on the head part of the boom, and on the drum boom le "" bedkoy from the side .; the opposite branch of the jib polyspast, one end of the traction rope was wound up, the other end of which was put through the head of the tower and connected to the head part of the boom, 2o Crane Po 1} o ton l and h. and also with the fact that the friend from the branches of the jib tackle is stocked through the top of the tower and connected to the head part of the arrow. Sources of information taken into account in the examination of 1, Nevzorov L, A, and others. Tower cranes, M, Higher School, 1976, (crane KB-250), s, 57, 60 (prototype).