Patent ID: 11946201
Assignee: JIANGSU XINGDA STEEL TYRE CORD CO., LTD.
Field: Other consumer goods (Other fields)
Classification: CPC D | IPC D

Claim 1:
2. The multilayer strand steel wire rope production device according to claim 1, wherein,
the position of each pre-former on the drum is calculated as follows:
with regard to one pre-former of the plurality of pre-formers, and the outer winding strand, the outer winding strand payoff spool, the first wire guide mechanism and the second wire guide mechanism corresponding to the one pro-former,
S1. when the drum rotates for a circle, a number of twisting circles of the outer winding strands on the drum is (1−cos α) circles; where α is a calculated twisting angle value of the multilayer strand steel wire rope;
S2. the outer winding strands are released from the outer winding strand payoff spools till to the hub for finishing the twisting, a total number of circles for the drum to rotate is N=(L1+L2+L3)/T1; a number of twisting circles of the outer winding strands is N′=N(1−cos α);
a theoretical exposure value of a central steel wire of the outer winding strand on a unit twisting pitch is

ΔL=T2−(L1+L2+L3)/[N′+(L1+L2+L3)/T2];

after a conversion,

ΔL=T2−T1T2/[(1−cos α)T2+T1] is obtained;

a distance, which is parallel to an axis of the drum, between a center of the first wire guide mechanism and a center of the second wire guide mechanism is L1, a distance from a point of tangency between the outer winding strand and the outer winding strand payoff spool to the first wire guide mechanism is L2, a distance between a center of the second wire guide mechanism and the hub is L3, a twisting pitch of the multilayer strand steel wire rope is T1, and a twisting pitch of the outer winding strand is T2;
S3. a theoretical threshold of exposure of the central steel wire of the outer winding strand from the payoff spool to the pre-former is L0, and when an exposure amount of the central steel wire of the outer winding strand reaches L0, a theoretical length of the required outer winding strand is L′=L0T2/ΔL;
S4. L is calculated according to a theoretical formula L=L1+L2−L′, L is a distance, which is parallel to the axis of the drum, between the pre-former and the center of the second wire guide mechanism, that is, the position of the pre-former.