SU935464A2 - Double safety tackle - Google Patents

Description

I

M3o6peteHMe refers to lifting mechanisms, namely to secure dual tackle chains.

According to the main and BT. St. A safe double polyspast is known, containing fixed and movable cages of blocks with ropes stored on them, one ends of which are attached to the winch drum, others are connected to the rod of the balancing hydrobuffer device consisting of a cylinder, through which 1 piston rod is passed in the central part, dividing the inner space of the cylinder into two cavities filled with liquid, with throttling grooves of various length connecting the inner surface of the cylinder along the generatrix the cavity of the cylinder between them

The disadvantage of this chain hoist is a relatively small range of alignment of the lengths of the ropes ;.

The purpose of the invention is to increase the reliability of the work of the tackle.

To achieve the goal, the tackle is equipped with guides carrying a slider, to which the ends of the ropes attached to the rod of the hydrobuffer device are attached, the guides being threaded to hold the lock nuts for fixing the slider.

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FIG. 1 depicts a general scheme of the safe double pulley in FIG. 2 - section of the equalizing hydraulic tank (|) of the emergency device during normal operation of the pulley j

15 ({zhg. 3 the same, while holding the load after the breakage of one of the ropes.

The offered safe polyspast contains a movable 1 and a fixed 2 cage of blocks with cables 3 mounted on them and (fixed with one end on the drum 5 of the winch, and others, turning blocks 6 of the rod 7 of the balancing hydrobuffer device 8, on the slide 9 mounted on metal constructions of guides 10. With the help of lock nuts 11, which form screw pairs with guides, the slider is fixed at any point of the guides. The equalizing hydrobuffer device is a closed lid 12 cylinder 13 through which the rod 7 passes, which contains in the central part a piston I, dividing the inner space of the cylinder into two cavities filled with liquid.At the same time, throttling grooves 15 are made on the inner surface of the cylinder, which can be of different lengths, or overflow section along the generatrix.

The operation of the proposed safe double pulley in the process of holding the load is as follows.

When both ropes 3 and C are intact, the alignment of the lengths and tensions occurs by moving the rod 7 with the piston I. In this case, the fluid flows through all the throttling grooves 15 from one cavity to the other. When one of the ropes breaks, the load, pad, moves the rod with the piston, which leads to a decrease in the number of grooves through which the fluid flows, and an increase in resistance to the flow of fluid, and consequently, to a smooth deceleration of the piston rod and, accordingly, the load to full stop. ., Lowering the load on the ground is done by rotating the winch drum. Moving the slider E along the rails

10, the lengths of the ropes are leveled with the weighting and in the case of uneven stretching during operation.

Due to the fact that the movement of the equalizing hydrobuffer device corresponds to twice the movement of the ropes, the use of the proposed safe double pulley block along with the simplification of hanging the ropes allows increasing the length equalization range of the ropes and increasing the reliability of the corresponding lifting machines.

Claims (1)

1. USSR author's certificate in application number 2799 58, cl. In 66 RZ / O, 12.07.79. V ui.3