SU549412A1 - Safe tackle - Google Patents

Description

(54) SAFE POLYSPAST

The invention relates to lifting devices, in particular to hoisting gears, equipped with devices that prevent the falling of the load when breaking one of the branches of the rope.

A safe polyspast containing the main and leveling drums and de-amping device I is known.

The known tackle is inconvenient in that the damping device in it is made hydraulically, which requires increased manufacturing accuracy and, accordingly, complicates the device.

A safe polyspast is known, containing a block of blocks with two ropes hoarded on them, some of which are mounted on the winch drum, and others on the leveling drum. 2

However, such a polyspast and. Has large dimensions and is not effective enough in work.

The purpose of the invention is to improve the efficiency of holding the cargo in case of the breakage of one of the ropes.

For this, the leveling drum is rigidly mounted on an axis, made with two threaded sections of opposite direction, located on both sides of the leveling drum and carrying discs interconnected by means of elastic elements.

FIG. 1 shows the proposed polysiast, a general view; in fig. 2 - leveling drum unit in the initial position; in fig. 3 - the same, after kapat breakage.

The safety tackle contains a block of blocks 1, two ropes 2 and 3 passing through the blocks of the cage and fixed at one end on the winch drum 4, and the other on the balancing drum 5. At the last, several turns of each rope are wound in such a way that the drum is reeled off and the other is reeled on: it. The drum 5 is rigidly fixed on the axis 6, which lies in the supports, and rotates with it.

The axis has two threaded sections on which the disks are mounted.

The direction of threading of the sections is opposite, i.e., the irp to the rotation of the leveler drum 7 is either approaching or moving away from one another. Between the discs are stretched and stretch arms - 8, the ends of which are fixed on the sleeves 9 inserted into the holes of the discs 7. Rigidly fixed on the sleeve 10 passes through the holes in the sleeves 9. there is a gap a. For the possibility of assembly and disassembly, one nz flange of the sleeves is removable.

The polyspast works as follows ..

When both ropes are intact, the alignment of tensions in branch x occurs due to a certain rotation of the equalizing drum. The discs 7 are then freely moved along the thread in the axial direction within the gaps a.

When any rope breaks, the load, pad, winds the second rope from the leveling drum, causing it to rotate. The discs 7 go through the gap and abut against the flanges of the sleeves 9, after which the compression or expansion of the springs 8 begins.

As a consequence, the fall of the load smoothly slows down to a complete stop. The load is loaded on the ground by rotation of the drum of the winch. The return of the discs 7 to the initial position is performed by rotating the equalizing drum. The operation of the cranes of safe tackles prevents not only damage to the crane, damage to the cargo, but also accidents when the cargo rope breaks.

F o) m o l and inventions

A safe polyspast containing a block of blocks with two ropes hoarded on them, one ends of which are fastened on the winch drum and others on the equalizing drum, so that, in order to improve the effect of holding the cargo, the breakage of one of the ropes , an equalizing drum is rigidly mounted on an axis made with two threaded sections of opposite direction, located on both sides of the equalizing drum and HecyuuiMH discs interconnected by means of elastic elements.

Sources of information taken into account in the examination:

1. The copyright certificate J o461896 B 66 D 3/04, 13.03.72.

2. The copyright certificate jYo436561 B 66 D 3/04, 07.09.72.

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