SU1416431A1 - Hoisting device - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to a lifting and transport machinery, in particular to lifting lifting and lowering devices. The purpose of the invention is to increase the reliability and safety of operation. The device comprises a shaft 2, a movable column 3 suspended by means of ropes 4, covering blocks 5, mounted at the bottom of the column, catchers 15 for holding the column at a rope, rod 12, levers. When a column is hindered by an obstacle, the column 3 turns in the shaft 2, depresses the upper or lower lever 10, the flat spring 16 goes down and closes the wedge catchers 15, stopping the fall of the column 3. 4 Il. 2

Description

(ABOUT

About 4

Od

"B.f

FIELD OF THE INVENTION The invention relates to lifting and transport machinery, namely to lifting devices. The purpose of the invention is to increase the reliability and safety of operation.

FIG. 1 shows the device, a general view; FIG. 2 shows the position of the movable column in the shaft between the fixed guide rollers; in fig. 3 - the position of the movable column in the shaft between the fixed and pivotally movable rollers in FIG. 4 - rope reserve on the blocks.

The device comprises a shaft 2 rigidly connected with the frame of the trolley 1, inside which a movable column 3 is installed, suspended by means of ropes 4, covering the lower blocks 5, placed at the base of the movable column 3, and the upper blocks 6, | associated with the frame of the trolley 1, and mounted on the drum of the winch 7. The movable column 3 in the shaft 2 is installed with a gap a in the three fixed guide rollers 8 and on two pivotally movable, spring-loaded 9, dual levers 10 of the guide rollers 11, the cushions of the rollers 8 and 11 are located on the outer surface of the shaft 2, and the rollers themselves are included in its rectangular windows, in contact with the guides of the movable column 3. The double levers 10 are interconnected by an adjustable bar 12 and are connected to a branch mi ropes 4 fixed on ur The warning traverse 13, through the axis 14, located in the triangular groove of the traverse 13, and catchers 15 installed in the shaft 2, are fixed by a flat spring 16 on the bracket 17 of the levers 10 that form an angle o (with the axis of the movable column 3,

0.5 ± la :. 7, (0,64 l h-m Im C -HO) a-b °

where m is the multiplicity of the rope pulley

j - efficiency of the chain hoist; c - lever lever; b is the distance to the suspension point

rope from the axis of rotation of the lever;

-

164312

k - coefficient of friction rolling

between the roller and the guide moving column; h - will move the moving column out of

mines;

a is the distance between the axles of the rollers;

p is the angle of inclination of the 10 on the drum ropes in the vertical plane. The device works as follows.

Vertical movement of the movable 15 column 3 inside the shaft 2 of the trolley 1 takes place when the ropes 4 are wound or rolled up, covering the lower 5 and upper 6 blocks, from the winch drum 7. Tension of the ropes 4 provided by the weight of the load being lifted or lowered, as well as moving column 3, through equalizing yoke 13, axis 14 of adjustable rod 12 compresses spring 9 25 and turns upward double levers 10 of guide rollers 11 until they move tightly until two movable column 3 is opposed by two opposite fixed directions conductive. 30 rollers 8 with a force equal to 0.3-0.5 of the weight of the lifted load, which ensures backlash-free, without vibration movement of the column 3 inside the shaft 2. When one of the ropes 4 breaks, the equalizing yoke 13 rotates around the axis 14, which is under the action of the spring 9 slides down the triangular groove of the equalizing bar 13

and through the barbell 12 turns down, I

40 pivotally movable double levers 10, which, through the bracket 17 and the flat spring 16, act on catchers 15, stop the fall of the movable column 3.

DS When hitting the bottom of the mobile column 3 on an obstacle during the movement of the mos. This crane column 3, turning in the shaft 2, depresses the upper or lower lever 10, while the flat spring 16, going down, closes the catches 15, stopping the vertical movement of the column 3.

35

50

Claims (1)

Invention Formula A lifting device containing a shaft, in the guide rollers of which a movable column is mounted, suspended by means of ropes. sixteen but sriel