SU382574A1 - TELESCOPIC BOOM OF LOADING CRANE - Google Patents

Description

one

Telesconic jibs of load-lifting cranes are known, the raising and lowering of which is carried out with the help of a power hydraulic cylinder, a portal and a suspension of a boom made in the form of a polyspast. The boom sections are extended and moved by the ropes forming between the tackle sections and the two drive winches. In such cranes on a turntable, the boom root sections are hinged, and the portal and the power cylinder are behind the lower ends. The upper end of the pores of the ala and the pins of the power cylinder are hingedly articulated between themselves and connected with the end of the last section of the boom through polpsnast. Ropes of extension and extension of the sliding sections of the boom are fixed with one ends to the lower ends of the sliding sections, and with the other ends to the drums of the drive winches.

Such an articulation of the main elements of the crane, as well as extending and retracting the boom retractable sections using drive winches and tackles between the sections, significantly complicates the crane, reduces its reliability and requires considerable time to transfer from the transport position to the working position and back. To transfer the crane from the transport position to the working position, it is necessary to raise the portal first.

and then push the telescopic boom sections.

In the proposed telescopic boom of a load-lifting crane, simplifying the design by using the boom change mechanism to extend and slide the inner section is achieved by fixing the boom section and the lower end of the gantry to the pivot.

a platform on a common joint, in front of which is a hinged end of the power cylinder. Extension ropes and two ropes: the extension section of the boom is fixed at one end to the turning portal,

and others to the bottom of the boom extendable section. In addition, to increase the advancement of the boom section in the area between the pivot gantry and the fixed boom section, the branches of the ropes can be made in the form of pulley blocks.

The boom suspension is made in the form of a cable stay, one end of which is fixed on the tip of the extendable boom section, and the other end is on the upper end of the portal. When the portal is raised or lowered from the transport position to the working position or back, the boom extendable section is simultaneously pushed in or out, which reduces the time required to transfer the crane from the transport position to the working position and back.

FIG. 1 schematically presents a general view of the proposed boom in the working position; in fig. 2 is a scheme for storing ropes for extending and moving the telescopic boom sections between the gantry and the boom root section; in fig. 3 is a schematic of storing ropes for extending and moving the telescopic boom sections containing more than two sections.

On the rotary platform 1, the rotary portal 2 and the telescopic boom 3 consisting of the fixed section 4 and the sliding section 5 are hinged. The front end of the fixed section 4 in the transport position rests on a post that is fixed to the frame of the crane chassis. At the front of the boom attachment point on the turntable 1, the power cylinder 6 is hinged, which is hinged at the top end to the portal 2. The top end of the portal 2 and the tip of the extendable section 5 are connected by a cable 7 (see Fig. 2), which acts as a boom suspension five.

The base of the sliding section 5 and the rotary portal 2 are connected by a rope 8, which is stocked through blocks 9 to 10, and a rope 11, which is stocked through blocks 12 and 13. Blocks I 10 and 12 are mounted directly on the root section 4, and block 13 is on a rack rigidly fixed in the rear part of the sliding section 4. In order to increase the extension of the sliding section 5, Bull branches can be applied between the rotary portal and the root section of polyspasts 14 and 15, respectively.

The base of the second pull-out section 16 and the front end of the root section 4 of the boom 3 are connected by an endless rope 17, which is stocked through blocks 18 and 19 mounted on opposite ends of the first pull-out section 5. The bottom of the third pull-out section 20 and the front end of the first pull-out section 5 are connected also endless Rope 21, which is stocked through blocks 22 and 23, mounted at opposite ends of the second pull-out section 16.

Before starting work, the crane is installed on the outrigger supports, and by removing the locking pins, the extension section 5 is dismounted. After that, using the power cylinder 6, the portal 2 is lifted to the complete tension of the rope 7. At the same time, the section 8 is simultaneously pulled out by the rope 8 5 and transfer of the rope 11 from the portal 2 towards the front end of the root section 5. The ropes 8 to 11 are made in such a way that when the portal 2 is rotated to the working position or back, their length ensures full extension and advance of the section 5. The slide-nominate and section 5 by setting the locking pins is secured by an arbitrary movement. With the help of the power cylinder 6, the portal 2 and the rope 17, the boom 5 is fed to the required height. After lifting, the boom 3 rotates the turntable 2 to the required angle, and with the help of the winch of the load rope 24, lower the lifting hook and moor the load.

When transferring the crane from the working position to the transport operation, it is performed in the reverse order, with boom 3 moving in the extension section 5 of the boom 3.

Subject invention

Claims (2)

1. Telescopic boom crane, containing at least two sections, fixed and internal retractable, interacting with extension and retract cables, a mechanism for changing the reach of the boom with a turning portal, in order to simplify the design by using the mechanism of change the boom for extending and locking the inner section, the rope extending and advancing the section are secured by the ends to the base of the inner section and the main ends respectively to the turning portal. 2. A telescopic boom according to claim I, characterized in that, in order to increase the code for the extension of the section, the branches of the rope of extension and advance in the section between the turning portal and the fixed section of the boom are made in the form of polyspast.