SU652100A1 - Load-handling variable-ratio pulley block - Google Patents

Description

This invention relates to the field of lifting mechanisms, namely, cargo polyspasts of variable multiplicity for cranes.

Known cargo polyspast variable multiplicity for cranes, containing a fixed and movable cage blocks, as well as an intermediate link located between them, fixed either on a movable or on a fixed cage blocks 1.

A disadvantage of the known polyspast is the necessity of manually fixing the intermediate link earring with a finger in a hook pendant.

The closest to the invention is a variable-multiplicity cargo tackle containing a fixed and movable cage of blocks, as well as an intermediate link of the blocks located between them, with its fixed cage equipped with a red gripper, at the lower ends of the arms of which guiding bevels and locking lugs are made, interacting with an increase in the multiplicity of the pulley with the corresponding elements

intermediate link, and the upper ends of the levers are interconnected by an energy accumulator 2.

The disadvantage of this cargo polyspast is the insufficient degree of automation of the process of changing the multiplicity of the chain hoist due to the need to control the gripping device from the crane operator's cabin.

The aim of the invention is to increase the degree of automation of the process of changing the multiplicity of the chain hoist.

For this, the energy accumulator contains a hydraulic cylinder with a spring-loaded piston, made with a throttling hole and with a relatively movable piston rod, and the gripping levers are provided with additional ledges that interact with a reduction in the multiplicity of the pulley with an intermediate block of blocks.

Figure 1 shows a cargo polyspast of variable multiplicity with a fourfold stocking of the cargo rope; in fig. 2 - the same, with a double reserve; in fig. 3 - intermediate position of the movable casing and intermediate link when reloading

from four to double reserve; ka fig. 4 shows section A-A in FIG. one; in fig. 5 a cut of FIG. 3; in fig. 6 - energy accumulator in the position corresponding to the initial POSITION; in fig. 7 - the same, at the first working stroke of the rod, when the lead-in part of the intermediate link separates the grippers of the gripping device; in fig. 8 the same, with the second working stroke of the shaft, corresponding to the maximum opening of the gripping ticks; in fig. 9 - the same, when lowering the intermediate link (delayed reduction to the Capture).

A variable-range cargo hoist consists of a fixed Clip 1 provided with a lever gripping device 2, a movable ring 3 having a lifting body, such as a hook, and a platform 4 for fixing the intermediate link 5 in the movable ring 3.

Intermediate link 5 has a lead-in part 6 and steps 7 to act on the lever gripper 2.

Lever gripping device 2 is made in the form of ticks, the lower end of which has guide bevels and locking protrusions for interacting with the corresponding lead-in part b and ledges 7 of intermediate link 5.

The upper ends of the tongs are interconnected by means of the energy accumulator 8.

The energy accumulator 8 is made in the form of a hydraulic cylinder 9 with a differential pressure piston 10 having an opening I, a stem 12 equipped with a plate 13 under the stop spring 14 and a ledge 15 on the shaft. The piston 10; And the pins 12 have the ability to move one relative to the other on a working stroke. The spring 16 serves to fix the initial position of the piston 10 in the hydraulic cylinder 9. The cavity of the cylinder 9 is filled with working fluid.

To reposition from two to four times stockpile, the movable casing 3 is raised together with intermediate link 5. Entry part 6 of intermediate link 5 opens the lever gripper 2 to the working stroke provided by the rod 12 relative to the piston 10 and

652100

the gripping device 2 closes under the ledges 7 by the spring 14.

To reposition it from four to two times, the movable holder 3 is lifted, which by means of platform 4 lifts intermediate link 5 and opens the gripping device 2, leaning with the lead-in part 6 into the upper additional benches 17 of its tongs, for a second stroke provided by the rod 12 together with piston 10.

The movable holder 3 is then lowered together with the intermediate link 5, the protrusions of the gripping device 2 are lowered.

Throttling the fluid through the opening 11 slows the return of the tongs of the gripping device 2.-

Claims (2)

1. Crane boosted. Operating Instructions . Machinoexport, M., 1973, p. 33, fig. 29. 2. The author's certificate number 171531 ,. cl. In 66 D 3/06, 1964. 652100, -J