SU1430429A2 - Hoisting rope structure - Google Patents

Abstract

The invention relates to a hoisting and transport machinery, namely, to structures of non-rotating wire ropes (K), designed to hold and transport a load, which is freely suspended at one end. The goal is to increase the reliability K by increasing its bearing surface, as well as expanding the field of application K, K of the cross lay contains from two to four strands twisted from wires (P), the outer ones of which are made of cores (C) with shells of more plastic material. Steel C is usually used as C, and shells are made of polyethylene, copper or aluminum. The shells of the outer Ps have flattened sections that coincide with the cylindrical surface described around K, in particular, those described around the points K most distant from the center of K. When crimping P from the sides, their shells have the appearance of mutually matching polygons with rounded verps. Given the dependence for the choice of steps -Wrinkle P in the strand and strand in K 4 Cp. f-ly, 2 ill. With s

Description

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The invention relates to lifting machinery for mechanical engineering, namely, to the construction of m non-twisted wire ropes designed to hold or transport a load; suspended freely at one end of the rope

The purpose of the invention is to increase the reliability of the rope by increasing its supporting surface, as well as expanding the field of application.

Fig. 1 shows a diagram): a double rope; fig 2 shows a cross section of a rope with different variants of the form of shells of plastic material;

The rope consists of two-strand strands 1, and the HanpakneHHH strands are strand in strands and strands into the rope are opposite (FIG. 1) o

; in order to reduce the contact stresses, as well as for some rope, some ESPs of specific properties, such as high electrical conductivity, in the rope, at least the conductive wires of the strands are made in the form of high strength core 2 and sheath 3 of a material more ductile than the core material

The rope is made non-twisting due to the fact that the torque in the ypaBHOBeDmBaeTCH rope is the twisting moment in strands.

The internal torque in the wire strand when stretching the rope is determined by the coefficient:

NEFrsincicos oi ,, (1) where n is the number of wires in the strand;

EF - wire stiffness for growth -

nenie.

Tj (L average radise s and angle of wire twining in "

, Elimination of torsion of the rope - when moving from an all-metal duct to a rope made of wires with elastic sheaths, it is necessary that the coefficient C does not change, i.e.

C, (2)

where C, is the coefficient for all-steel rope; Cg coefficient for rope containing wire with plate

shells ,. The radii of twist the diameters and; 1 the number of wires does not change by the poet: / the condition

Fusinoi., Cos oi .. F sinoijcos oi ,, {3)

where F, is the cross-sectional area of all wires of the rope

7 - P c-area of the bearing part of the rope, i.e., cores (without taking into account the cross-sectional area of plastic shells

P

in the range used in the ropes

angles can be taken with sufficient accuracy

, BUT; one ;

sinoi, tgoi, 2 ir--;

sinoi.i

where h is the steps of twisting the wires in

pr. After substitution in (3) we have

EK .1 FH

s

h, h,

or

. (four)

(five)

According to the basic invention:

h, 2H (g) 2,

where H and R are the pitch and radius of twisting into the rope, Uni (5) and (6), we have

g, /. FoS .. .. State University d-.b2 (1 -) ()

(7)

Condition (7) establishes a new upper limit of the h / H ratio within the scope of the main invention and allows for designing uncoiled ropes from wire with plastic shells, for example, from bimetallic wire,

The lower limit of the h / H ratio is established on the condition that the rope does not twist with free suspension of the load. This requires the fulfillment of the condition

Rtg / i - rO, where p is the angle of the strand twist in the rope.

P

Substitutions here tg and tg6i g h

Zur find

iib (1) 2

H -R

(eight)

Comb (7) and (8), we obtain the inequality:

 - 2 (1 - -25.) F-): 4 - H - - F. -R

As a carrier of high-strength cores 2, it is most expedient to use steel wire, and the material of the shells 3 is chosen depending on the functional purpose. So, if it is necessary to improve the corrosion resistance of the rope, then plastic or metal shells, such as polyethylene, can be used. It is advisable to use copper or aluminum in order to conduct the cable conductivity. The easiest way to do this is to use a bimetallic stapled or stale-aluminum wire.

Plastic shells wear out quickly when the rope is operated on blocks 20 or drums, so it is advisable to increase the contact area of these shells with the block by forming flattened sections on the outer surface .- 25

Due to the presence of flattened areas on the sheaths of the outer wires, the contact pressures and wear of these shells are reduced. Flattened areas can be formed along several surface vacations of the wire sheath.

riants

According to variant I, the flattened portion 4 on the outer wires coincides with the circumference 5 circumscribed around the section of the rope (figure 2).

In option .II circle 6, with which coincides section 4, touches high strength core 2. Thus, core 2 at point 7 comes to the surface and comes into contact with the unit. Due to its high hardness and wear resistance, the core 2 in this case prevents the plastic shell 3 from wear.

According to variant III, shells 4 have a shaped form of sections in the form of interconnecting curved polygons 8 with rounded vertices with adjacent wires. In this case, flattened areas are not only

1430429

Claims (4)

on the outer surface of the strand, but also at the points of mutual contact of the wires. Invention Formula 1. Lifting rope on the bus. St. No. 407984, characterized in that, in order to maintain reliability, at least the outer wires in the strands are made in the form of high-strength cores and shells of more ductile material than the material of the cores, wherein d to the step of twisting pruzdey in contact selected from the condition P (|). (1- |). Of., where h is the stride pitch of the wire in p; H - spacing of strands into the rope; g - the average radius of the twist wire in prd-, R - the average radius of twisting the strands in the rope cross-sectional area of all rope shells} cross-sectional area of all wires of the rope. , 2. The rope according to claim 1, characterized in that the outer F have flattened areas that coincide with the cylindrical surface described around the rope. 3. Cables according to claims 1 and 2, characterized in that the flattened sections of the shells coincide with the cylindrical surface described around the points of the cores most distant from the center of the rope. 4. A cable according to claims 1 to 3, characterized in that in the cross section of the shell they have the form of mutually matching polygons with rounded vertices. 5 Rope according to claims 1-4, characterized in that, in order to expand the field of use, the sheaths of the outer wires of each strand are made of a material with high electrical conductivity. III //