MULTILAYER STRAND STEEL WIRE ROPE PRODUCTION DEVICES

Abstract

A multilayer strand steel wire rope production device is provided. A pre-former is fixed on a drum, and a specific position of the pre-former is defined, a center strand payoff spool and a plurality of outer winding strand payoff spools are provided in the drum. The first wire guide mechanism is close to the corresponding outer winding strand payoff spool. One end of the outer surface of the drum away from the first wire guide mechanism is provided with a second wire guide mechanism, and a hub is additionally provided and located on one side of the drum close to the second wire guide mechanism; outer winding strands drawn from the plurality of outer winding strand payoff spools sequentially pass the first wire guide mechanism, the pre-former, and the second wire guide mechanism, and are guided to the hub for gathering to complete strand wire twisting.

Claims

1. A multilayer strand steel wire rope production device, comprising a drum, wherein, a center strand payoff spool and a plurality of outer winding strand payoff spools are provided in the drum, pre-formers corresponding to the outer winding strand payoff spools and a first wire guide mechanism are provided on an outer surface of the drum, and the first wire guide mechanism is close to the corresponding outer winding strand payoff spool; one end of the outer surface of the drum away from the first wire guide mechanism is provided with a second wire guide mechanism, and a hub is additionally provided and located on one side of the drum close to the second wire guide mechanism; outer winding strands drawn from the plurality of outer winding strand payoff spools sequentially pass the first wire guide mechanism, the pre-former, and the second wire guide mechanism, and are guided to the hub for gathering to complete strand wire twisting.

2. The multilayer strand steel wire rope production device according to claim 1, wherein, a calculation method of a position of the pre-former is: S1. a twisting angle of the multilayer strand steel wire rope is α, and 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; 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=(L.sub.1+L.sub.2+L.sub.3)/T.sub.1; 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=T.sub.2−(L.sub.1+L.sub.2+L.sub.3)/[N′+(L.sub.1+L.sub.2+L.sub.3)/T.sub.2]; after a conversion,
ΔL=T.sub.2−T.sub.1T.sub.2/[(1−cos α)T.sub.2+T.sub.1] 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 L.sub.1, 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 L.sub.2, a distance between a center of the second wire guide mechanism and the hub is L.sub.3, a twisting pitch of the multilayer strand steel wire rope is T.sub.1, and a twisting pitch of the outer winding strand is T.sub.2; 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 L.sub.0, and when an exposure amount of the central steel wire of the outer winding strand reaches L.sub.0, a theoretical length of the required outer winding strand is L′=L.sub.0T.sub.2/ΔL; S4. L is calculated according to a theoretical formula L=L.sub.1+L.sub.2−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.

3. The multilayer strand steel wire rope production device according to claim 2, wherein, a theoretical threshold of exposure of the central steel wire of the outer winding strand is L.sub.0≤6.5 D, and D is a diameter of the multilayer strand steel wire rope.

4. The multilayer strand steel wire rope production device according to claim 1, wherein, a stable tensile force provided by the outer winding strand payoff spool for the steel wire is 2-10% of a strand wire breaking force.

5. The multilayer strand steel wire rope production device according to claim 4, wherein, the stable tensile force provided by the outer winding strand payoff spool for the steel wire is 6% of the strand wire breaking force.

6. The multilayer strand steel wire rope production device according to claim 1, wherein, the pre-former is a needle-type deformer, a bearing deformer, a triangle deformer, a hexagon deformer, or a special-shaped deformer.

7. The multilayer strand steel wire rope production device according to claim 2, wherein, a stable tensile force provided by the outer winding strand payoff spool for the steel wire is 2-10% of a strand wire breaking force.

8. The multilayer strand steel wire rope production device according to claim 3, wherein, a stable tensile force provided by the outer winding strand payoff spool for the steel wire is 2-10% of a strand wire breaking force.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 is a schematic structural diagram when guide rollers are used as a first wire guide mechanism and a second wire guide mechanism in a multilayer strand steel wire rope production device in embodiment 1;

[0025] FIG. 2 is a schematic structural diagram when a guide roller is used as a first wire guide mechanism and a flywheel disc is used as a second wire guide mechanism in a multilayer strand steel wire rope production device in embodiment 1;

[0026] FIG. 3 is a schematic structural diagram of a pre-former of a multilayer strand steel wire rope production device in embodiment 1;

[0027] FIG. 4 is a schematic structural diagram of a cross section of a produced multilayer strand steel wire rope in embodiment 1;

[0028] FIG. 5 is a schematic structural diagram of a multilayer strand steel wire rope production device (a pre-former is placed at a conventional position) in comparative example 3;

[0029] In the drawings: 1. a drum; 2. an outer winding strand payoff spool; 3. a pre-former; 4. a first wire guide mechanism; 5. a second wire guide mechanism; 6. a hub; 7. an outer winding strand; 8. a center strand payoff spool.

DETAILED DESCRIPTION

[0030] The technical solutions of the present invention are clearly and fully described below. Apparently, the described embodiments are merely some of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill without involving an inventive effort shall fall within the scope of protection of the present invention.

[0031] As shown in FIG. 1 or FIG. 2, in the following embodiments, a plurality of outer winding strand payoff spools is provided inside a drum in line, a center strand payoff spool is closest to a hub, and when the drum rotates, the center strand payoff spool and the outer winding strand payoff spools would not rotate along with the drum. Therefore, when the pre-manufactured outer winding strand and center strand are further twisted to manufacture a multilayer strand steel wire rope, and when the drum rotates for one circle, an L.sub.2 section of outer winding strand is to be twisted. Similarly, because of the limitation of stranding dies at the hub, an L.sub.3 section of outer winding strand is also to be twisted. In the following embodiment, taking the production of an SZS alternating twisting structure of a 6*19-wsc structure of elevator door motor steel wire rope as an example, a twisting direction of the steel wire rope is an S twisting direction, a twisting direction of an outer winding strand is a Z twisting direction, and a twisting direction of a center strand is the S twisting direction, when the drum rotates, the L.sub.2 section is twisted in a direction (i.e., the Z twisting direction) reverse to the twisting direction (the S twisting direction), and the L.sub.3 section is twisted in the S twisting direction same as the twisting direction. Because the structure of the multilayer strand steel wire rope is alternating twisting, the outer winding strand has a twisting effect under the effect of the Z twisting direction at the L.sub.2 section based on the original Z twisting direction, and has a detwisting effect under the effect of the S twisting direction at the L.sub.3 section based on the original Z twisting direction. According to “STEEL TIRE CORD PRODUCTION” (Wang Tianchong and CHU Yuanzhang, STEEL TIRE CORD PRODUCTION [M], BEIJING: Press of University of Science and Technology Beijing, 1996: 145.), it can be known that a twisting angle generated at the L.sub.2 section when the drum rotates for a circle is 2π(i.e., a circle), a twisting angle generated at the L.sub.3 section is 2πcos α (i.e., cosa circle), and α is a twisting angle of the rope. Therefore, twisting of the outer winding strand at a unit length is 2π(1−cos α), i.e., (1−cos α) circle. It can be known according to the contents disclosed above, when producing the alternating twisting steel wire rope, the twisting of the L.sub.2 section of outer winding strand is same as the twisting direction of the outer winding strand. When twisting, the outer winding strand is released from the outer winding strand payoff spool and is always subjected to a twisting effect, the L.sub.3 section of outer winding strand is detwisted, but is also twisted for (1−cos α) circle actually. Because the central steel wire of the outer winding strand would not change in the twisting process, and an outer winding single steel wire of the outer winding strand is in a twisted state, the central steel wire of the outer winding strand has a tendency of outward protrusion and exposure.

[0032] In the following embodiment, the multilayer strand steel wire rope used therein is 6*19-wsc alternating twisting structure of steel wire rope having a steel wire rope diameter of 3.2 mm, the specific structure of the steel wire rope is (0.265+6*0.245+12*0.245)+6*(0.245+6*0.205+12*0.205), the twisting pitch of the steel wire rope is T.sub.1=21.5 mm, and the twisting pitch of the outer winding strand is T.sub.2=6.5 mm or 13.5 mm.

[0033] A distance, which is parallel to the axis of the drum, between the pre-former and the center of the second wire guide mechanism is L. A distance, which is parallel to the axis of the drum, between the center of the first wire guide mechanism and the center of the second wire guide mechanism is L.sub.1. A distance between a point of tangency between the outer winding strand and the outer winding strand payoff spool and the first wire guide mechanism is L.sub.2. A distance between the center of the second wire guide mechanism and the hub is L.sub.3.

Embodiment 1

[0034] As shown in FIGS. 1-4, a structure similar to a Tyrone tubular-type stranding machine is used in a multilayer strand steel wire rope production device provided in this embodiment, where the production device includes a drum 1, six outer winding strand payoff spools 2 and one center strand payoff spool 8 are provided in the drum 1, pre-former 3 corresponding to the outer winding strand payoff spools 2 are provided on the outer surface of the drum 1, a first wire guide mechanism 4 tightly close to the pre-former 3 is provided on the outer surface of the drum 1, one end of the outer surface of the drum 1 away from the first wire guide mechanism 4 is provided with a second wire guide mechanism 5, and a hub 6 is additionally provided and located on one side of the drum 1 close to the second wire guide mechanism 5. Outer winding strands 7 drawn from the plurality of outer winding strand payoff spools 2 sequentially pass the first wire guide mechanism 4, the pre-former 3, and the second wire guide mechanism 5, and are guided to the hub 6 for gathering to complete strand wire twisting. The six outer winding strand payoff spools 2 are respectively named as number one to number six outer winding strand payoff spools according to a distance from the hub 6 from far to near, and corresponding pre-formers 3 are also named as number one to number six pre-formers. Six payoff spools are drawn in FIG. 1 or FIG. 2, and the position of number one pre-former is only drawn, the positions of other pre-formers are similar to that of number one pre-former, and therefore are not drawn. In the device provided in FIG. 1, the first wire guide mechanism and the second wire guide mechanism are common guide rollers in the art. In the device provided in FIG. 2, the first wire guide mechanism is the guide roller, the second wire guide mechanism is a common flywheel disc in the art, and a plurality of threading holes is provided on the flywheel disc and is used for passing and guiding of the outer winding strand.

[0035] For the position of the pre-former on the drum, that is, the calculation method of L is:

[0036] S1. the twisting angle of the multilayer strand steel wire rope is α=arctan π[(0.265+4*0.245)+(0.245+4*0.205)]/21.5=18.64°, and when the drum rotates for a circle, the number of twisting circles of the outer winding strands on the drum is (1−cos α) circles.

[0037] S2. the outer winding strands are released from the outer winding strand payoff spools till to the hub for finishing the twisting, the total number of circles for the drum to rotate is N=(L.sub.1+L.sub.2+L.sub.3)/T.sub.1; the number of twisting circles of the outer winding strands is N′=N(1−cos α);

[0038] a theoretical exposure value of a central steel wire of the outer winding strand on a unit twisting pitch is

ΔL=T.sub.2−(L.sub.1+L.sub.2+L.sub.3)/[N′+(L.sub.1+L.sub.2+L.sub.3)/T.sub.2];

[0039] after a conversion,

ΔL=T.sub.2−T.sub.1T.sub.2/[(1−cos α)T.sub.2+T.sub.1] is obtained;

[0040] a distance, which is parallel to the axis of the drum, between the pre-former and the center of the second wire guide mechanism is L; by means of measurement, a distance, which is parallel to the axis of the drum, between the center of number one outer winding strand payoff spool and the center of the second wire guide mechanism is L.sub.1=6500 mm; a distance between a point of tangency between the outer winding strand and the outer winding strand payoff spool and the first wire guide mechanism is L.sub.2=500 mm; a distance between the center of the second wire guide mechanism and the hub is L.sub.3=500 mm; a twisting pitch of the multilayer strand steel wire rope is T.sub.1=21.5 mm, and a twisting pitch of the outer winding strand is T.sub.2=13.5 mm, so as to obtain ΔL=0.43 mm by means of calculation.

[0041] S3. a theoretical threshold of exposure of the central steel wire of the outer winding strand is L.sub.0=6.5 D=20.8 mm, and a theoretical length of the required outer winding strand is L′=653 mm by means of calculation.

[0042] S4. L=6347 mm is calculated according to the formula L=L.sub.1+L.sub.2−L′, that is, L=97.64% L.sub.1.

[0043] Similarly to number one outer winding strand payoff spool, a distance, which is parallel to the axis of the drum, between the center of number two outer winding strand payoff spool and the second wire guide mechanism is L.sub.1=5500 mm, ΔL=0.43 mm, and L=5347 mm of number two pre-former is calculated, that is, L=97.21% L.sub.1.

[0044] By analogy, a distance, which is parallel to the axis of the drum, between the center of number three outer winding strand payoff spool and the second wire guide mechanism is L.sub.1=4500 mm, and L=4347 mm of number three pre-former is calculated, that is, L=96.6% L.sub.1.

[0045] A distance, which is parallel to the axis of the drum, between the center of number four outer winding strand payoff spool and the second wire guide mechanism is L.sub.1=3500 mm, L=3347 mm of number four pre-former is calculated, that is, L=95.63% L.sub.1.

[0046] A distance, which is parallel to the axis of the drum, between the center of number five outer winding strand payoff spool and the second wire guide mechanism is L.sub.1=2500 mm, L=2347 mm of number five pre-former is calculated, that is, L=93.88% L.sub.1.

[0047] A distance, which is parallel to the axis of the drum, between the center of number six outer winding strand payoff spool and the second wire guide mechanism is L.sub.1=1500 mm, L=1347 mm of number six pre-former is calculated, that is, L=89.8% L.sub.1.

[0048] The center strand payoff spool is used for releasing a center strand, and therefore, no pre-former is provided.

Embodiment 2

[0049] A multilayer strand steel wire rope production device same as that selected in embodiment 1 is selected in this embodiment, and the difference is that a twisting pitch of an outer winding strand selected in this embodiment is T.sub.2=6.5 mm, and ΔL=0.1 mm is calculated. When a theoretical threshold of exposure of a central steel wire of the outer winding strand is L.sub.0=20.8 mm, L′=1352 mm is calculated.

[0050] Furthermore, a calculation method same as that in embodiment 1 is used, L.sub.1=6500 mm, L=5648 mm of No.1 pre-former is calculated, that is, L=86.89% L.sub.1.

[0051] Similarly to number one outer winding strand payoff spool, a distance, which is parallel to the axis of the drum, between the center of number two outer winding strand payoff spool and the second wire guide mechanism is L.sub.1=5500 mm, and L=4648 mm of number two pre-former is calculated, that is, L=84.51% L.sub.1.

[0052] By analogy, a distance, which is parallel to the axis of the drum, between the center of number three outer winding strand payoff spool and the second wire guide mechanism is L.sub.1=4500 mm, and L=3648 mm of number three pre-former is calculated, that is, L=81.06% L.sub.1.

[0053] A distance, which is parallel to the axis of the drum, between the center of number four outer winding strand payoff spool and the second wire guide mechanism is L.sub.1=3500 mm, L=2648 mm of number four pre-former is calculated, that is, L=75.65% L.sub.1.

[0054] A distance, which is parallel to the axis of the drum, between the center of number five outer winding strand payoff spool and the second wire guide mechanism is L.sub.1=2500 mm, L=1648 mm of number five pre-former is calculated, that is, L=65.92% L.sub.1.

[0055] A distance, which is parallel to the axis of the drum, between the center of number six outer winding strand payoff spool and the second wire guide mechanism is L.sub.1=1500 mm, L=648 mm of number six pre-former is calculated, that is, L=43.2% L.sub.1.

[0056] The center strand payoff spool is used for releasing a center strand, and therefore, no pre-former is provided.

Embodiment 3

[0057] This comparative example is basically same as embodiment 1, and the difference is that a theoretical threshold of exposure of a central steel wire of the outer winding strand according to the comparative example is L.sub.0=6.0 D.

[0058] A calculation method same as that in embodiment 1 is used to obtain:

[0059] L=6420 mm of number one pre-former, that is, L=98.77% L.sub.1;

[0060] L=5420 mm of number two pre-former, that is, L=98.55% L.sub.1;

[0061] L=4420 mm of number three pre-former, that is, L=98.22% L.sub.1;

[0062] L=3420 mm of number four pre-former, that is, L=97.71% L.sub.1;

[0063] L=2420 mm of number five pre-former, that is, L=96.8% L.sub.1;

[0064] L=1420 mm of number six pre-former, that is, L=94.67% L.sub.1.

COMPARATIVE EXAMPLE 1

[0065] This comparative example is basically same as embodiment 1, and the difference is that a theoretical threshold of exposure of a central steel wire of the outer winding strand according to the comparative example is L.sub.0=7.0 D.

[0066] A calculation method same as that in embodiment 1 is used to obtain:

[0067] L=6297 mm of number one pre-former, that is, L=96.87% L.sub.1;

[0068] L=5297 mm of number two pre-former, that is, L=96.31% L.sub.1;

[0069] L=4297 mm of number three pre-former, that is, L=95.49% L.sub.1;

[0070] L=3297 mm of number four pre-former, that is, L=94.2% L.sub.1;

[0071] L=2297 mm of number five pre-former, that is, L=91.88% L.sub.1;

[0072] L=1297 mm of number six pre-former, that is, L=86.47% L.sub.1.

COMPARATIVE EXAMPLE 2

[0073] As shown in FIG. 5, a general Tyrone tubular-type stranding machine is used in this comparative example, a pre-former is provided between a drum and a hub, all the outer winding strands in the drum are pre-deformed by means of the pre-former and then are twisted at the hub.

[0074] Application example 1: detection of quality of multilayer strand steel wire ropes produced in multilayer strand steel wire rope production devices according to embodiments 1-3 and comparative examples 1 and 2.

[0075] According to YBT 4251, the surfaces of steel wires shall be smooth and flat, and defects such as interleaving, bending and broken wires shall not exist in the steel wires in a steel wire rope. Problems of overturinng and exposure of central steel wires of outer winding strands of the multilayer strand steel wire ropes produced in the multilayer strand steel wire rope production devices according to embodiments 1-3 and comparative examples 1 and 2 are detected. Specific results are shown in Table 1 below.

TABLE-US-00001 TABLE 1 detection results of multilayer strand steel wire ropes in embodiments 1-3 and comparative examples 1 and 2 Embodiment Embodiment Embodiment Comparative Comparative Number 1 2 3 example 1 example 2 Detection Flat surface Flat surface Flat surface The surface of The surface of results Feel smooth Feel smooth Feel smooth the rope has the rope has steel wire steel wire bending, and bending, and is sharp and is sharp and thorny thorny Determination Qualified Qualified Qualified Unqualified Unqualified results

[0076] According to the detection results above, it can be known that the technical solution provided in the present patent is used, compared with the existing tubular-type stranding machine, outward protrusion and exposure of the central steel wires of the outer winding strands can be better prevented actually, and it is indicated that the calculation method about the position of the pre-former in the present application is relatively scientific and reasonable, and in line with the actual situation. Moreover, when a theoretical threshold of exposure of the central steel wire of the outer winding strand is L.sub.0=6.0 D and 6.5 D, the quality of the manufactured multilayer strand steel wire rope is high. However, the theoretical threshold is slightly increased to 7 D, a few quality problems would occur. This indicates that it is relatively accurate and reasonable that the value of the theoretical threshold L.sub.0 does not exceed 6.5 D.