A polygonal steel cord

Abstract

The present invention discloses a polygonal steel cord in the field of steel cord technology, aiming to solve the problem in the prior art that the steel cord wires are too tightly packed together, preventing rubber viscous fluid from penetrating the stranded steel wires. The stranded steel wires comprise a core steel wire and an outer layer of steel wires, the outer layer of steel wires being twisted along the core steel wire and distributed around the core steel wire. The core steel wire comprises three first steel wires twisted together, and the outer layer of steel wires comprises at least fifteen second steel wires twisted together, with gaps between adjacent second steel wires. The outer layer of steel wires comprises three second steel wires tangent to any two adjacent first steel wires in the core steel wire. The present invention is suitable for tire manufacturing and can change the structure of the steel cord. The rubber viscous fluid can fully penetrate and embed itself around each steel cord wire through the gaps between the steel cord wires, thereby improving the stability and anchoring properties of the steel cord structure.

Description

Technical Field

[0001] The invention relates to a polygonal steel cord, belonging to the technical field of steel cords. Background Art

[0002] Steel cord is a crucial component of radial tire carcass materials, and compact steel cord is currently widely manufactured and used. Conventional compact steel cords are constructed by accommodating numerous monofilaments within a limited cross-section, resulting in a compact cross-sectional structure. However, the filaments and layers of these compact steel cords are arranged too closely together. This prevents the rubber viscous fluid from penetrating the intermediate steel cord layers during rubber vulcanization. This low rubber penetration leads to high air content in the inner layers of the steel cord, reducing the steel cord's corrosion resistance, fatigue resistance, impact resistance, and wing adhesion retention, ultimately impacting the tire's service life. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a polygonal steel cord structure to solve the problem that the steel wires of the prior art steel cord are too close to each other, the rubber viscous fluid cannot penetrate into the strand steel wires, and the internal air content is high.

[0004] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0005] The present invention provides a polygonal structure steel cord, comprising strand steel wires, wherein the strand steel wires include core strand steel wires and outer layer steel wires, the outer layer steel wires are twisted along the core strand steel wires and uniformly distributed on the periphery of the core strand steel wires, the core strand steel wires are twisted together by three first steel wires, the outer layer steel wires are twisted together by at least fifteen second steel wires, there are gaps between adjacent second steel wires, and the outer layer steel wires include three second steel wires that are tangent to any two adjacent first steel wires in the core strand steel wires.

[0006] Furthermore, the first steel wire is formed by twisting three third steel wires.

[0007] Furthermore, the twist direction of the first steel wires is the same as the twist direction of the core steel wires.

[0008] Furthermore, the lay length of the first steel wire is 0.5 times the lay length of the core steel wire.

[0009] Furthermore, the twist direction of the outer layer steel wires is the same as that of the core strand steel wires, the lay length of the outer layer steel wires is equal to that of the core strand steel wires, and the lay length of the outer layer steel wires is 15 to 23 mm.

[0010] Furthermore, the diameter of the third steel wire is the same as the diameter of the second steel wire, and the diameter of the second steel wire is 0.17-0.415 mm.

[0011] Furthermore, the outer periphery of the strand steel wire is wrapped with an outer wrapping steel wire.

[0012] Furthermore, the twist direction of the outer wrapping steel wire is opposite to the twist direction of the strand steel wire.

[0013] Furthermore, the cross section of the stranded steel wire is a polygonal structure.

[0014] Furthermore, the gap is at least 0.02 mm.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention changes the structure of the steel cord so that there are gaps between each second steel wire. When the rubber is vulcanized, the rubber viscosity can fully penetrate through the gaps between the steel cord wires and be embedded around each steel cord wire. The rubber penetration performance is greatly improved, effectively improving the stability and anchoring performance of the steel cord structure. The improvement in rubber coating performance can enhance the tire's corrosion resistance, fatigue resistance, impact resistance, and adhesion retention.

[0017] 2. The present invention makes three second steel wires tangent to any two adjacent first steel wires, so that the strand steel wires have a stable polygonal structure and increase their strength, thereby forming a tight and stable polygonal structure with low line density and high strength, which meets the requirements of lightweight tire development and can effectively reduce the production cost of tires. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic cross-sectional view of a steel cord with outer wrapped steel wires provided in an embodiment of the present invention;

[0019] Figure 2 2 is a schematic cross-sectional view of a steel cord without an outer wrapped steel wire provided in an embodiment of the present invention;

[0020] Figure 3 It is a cross-sectional schematic diagram of a first prior art structural steel cord;

[0021] Figure 4 It is a cross-sectional schematic diagram of the second prior art structural steel cord.

[0022] In the figure: 10, core steel wire; 11, first steel wire; 12, third steel wire; 20, outer steel wire; 21, second steel wire; 30, strand steel wire; 40, outer wrapping steel wire. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0026] like Figure 1-2 As shown, the present invention provides a polygonal structure steel cord, including strand steel wires 30, the strand steel wires 30 including core strand steel wires 10 and outer layer steel wires 20, the outer layer steel wires 20 are twisted along the core strand steel wires 10 and evenly distributed on the periphery of the core strand steel wires 10, the core strand steel wires 10 are twisted together by three first steel wires 11, the outer layer steel wires 20 are twisted together by at least fifteen second steel wires 21, there are gaps between adjacent second steel wires 21, the outer layer steel wires 20 include three second steel wires 21 and are tangent to any two adjacent first steel wires 11 in the core strand steel wires 10; the first steel wires 11 The invention comprises three third steel wires 12 twisted together; the twist direction of the first steel wire 11 is the same as the twist direction of the core steel wire 10; the lay length of the first steel wire 11 is 0.5 times the lay length of the core steel wire 10; the twist direction of the outer steel wire 20 is the same as the twist direction of the core steel wire 10, the lay length of the outer steel wire 20 is equal to the lay length of the core steel wire 10, and the lay length of the outer steel wire 20 is 15 to 23 mm; the diameter of the third steel wire 12 is the same as the diameter of the second steel wire 21, and the diameter of the second steel wire 21 is 0.17 to 0.415 mm; the cross-section of the strand steel wire 30 is a polygonal structure, and the gap is at least 0.02 mm.

[0027] Specifically, the lay length of the first steel wire 11 is 0.5 times the lay length of the core steel wire 10, thereby increasing the contact area between the two, reducing the point contact friction between the two, and ensuring the bearing capacity of the steel cord; the present invention changes the structure of the steel cord so that there is a gap between each second steel wire 21, and there is also a gap between it and the core steel wire 10, so that when the rubber is vulcanized, the rubber viscosity can fully penetrate through the gaps between the steel cord wires and be embedded around each steel cord wire, the penetration performance of the rubber is greatly improved, and the steel cord structure is effectively improved. Stability and anchoring, the improvement of rubber coating performance can improve the corrosion resistance, fatigue resistance, impact resistance and adhesion retention of the tire; at the same time, the present invention makes the three second steel wires 21 tangent to any two adjacent first steel wires 11, so that the strand steel wire 30 has a stable polygonal structure, which increases its strength, thereby forming a tight and stable polygonal structure with low line density and high strength, which meets the requirements of lightweight tire development and can effectively reduce the production cost of the tire, thereby ensuring its working effect, and the gap is at least 0.02mm to avoid affecting the penetration performance of the rubber.

[0028] In an embodiment, the outer wrapping steel wires 40 are wrapped around the outer periphery of the strand steel wires 30 , and the twist direction of the outer wrapping steel wires 40 is opposite to that of the strand steel wires 30 .

[0029] Optionally, the lay length of the outer wrapped steel wire 40 ranges from 3.5 to 5 mm, and the diameter of the outer wrapped steel wire 40 ranges from 0.15 to 0.25 mm.

[0030] Example 1:

[0031] according to Figure 1-4 In this embodiment, the lay length of the outer steel wire 20 and the lay length of the core steel wire 10 are both 16 mm. The core steel wire 10 is twisted by three first steel wires 11, and the twist direction of the first steel wire 11 is the same as the twist direction of the core steel wire 10. The lay length of the first steel wire 11 is 0.5 times the lay length of the core steel wire 10. The diameters of the second steel wire 21 and the third steel wire 12 are both 0.175 mm, and the diameter of the outer winding steel wire 40 is 0.15 mm.

[0032] Table 1 is a performance comparison table of the first prior art steel cord, the steel cord without the outer steel wire 40 of the present invention, and the steel cord with the outer steel wire 40 of the present invention.

[0033] Table 1

[0034]

[0035]

[0036] in, Figure 1Schematic cross-sectional view of a steel cord with an outer steel wire 40 wrapped around its periphery according to the present invention. Figure 2 Schematic cross-sectional view of a steel cord without an outer steel wire 40 according to the present invention. Figure 3 It is a cross-sectional schematic diagram of the first prior art steel cord; by comparison, it can be seen that the rubber permeability of the steel cord provided by the present invention is better than that of the first prior art, which effectively improves the stability and anchoring performance of the steel cord structure.

[0037] Example 2:

[0038] according to Figure 1-4 In this embodiment, the lay length of the outer steel wire 20 and the lay length of the core steel wire 10 are both 18 mm. The core steel wire 10 is twisted by three first steel wires 11, and the twist direction of the first steel wire 11 is the same as the twist direction of the core steel wire 10. The lay length of the first steel wire 11 is 0.5 times the lay length of the core steel wire 10. The diameters of the second steel wire 21 and the third steel wire 12 are both 0.22 mm, and the diameter of the outer winding steel wire 40 is 0.15 mm.

[0039] Table 2 is a performance comparison table of the first prior art steel cord, the steel cord without the outer steel wire 40 of the present invention, and the steel cord with the outer steel wire 40 of the present invention.

[0040] Table 2

[0041]

[0042]

[0043] in, Figure 1 Schematic cross-sectional view of a steel cord with an outer steel wire 40 wrapped around its periphery according to the present invention. Figure 2 Schematic cross-sectional view of a steel cord without an outer steel wire 40 according to the present invention. Figure 3 It is a cross-sectional schematic diagram of the first prior art steel cord; by comparison, it can be seen that the rubber permeability of the steel cord provided by the present invention is better than that of the first prior art, which effectively improves the stability and anchoring performance of the steel cord structure.

[0044] Example 3:

[0045] according to Figure 1-4 In this embodiment, the lay length of the outer steel wire 20 and the lay length of the core steel wire 10 are both 18 mm. The core steel wire 10 is twisted by three first steel wires 11, and the twist direction of the first steel wire 11 is the same as the twist direction of the core steel wire 10. The lay length of the first steel wire 11 is 0.5 times the lay length of the core steel wire 10. The diameters of the second steel wire 21 and the third steel wire 12 are both 0.245 mm, and the diameter of the outer winding steel wire 40 is 0.15 mm.

[0046] Table 3 is a performance comparison table of the second prior art steel cord, the steel cord without the outer steel wire 40 of the present invention, and the steel cord with the outer steel wire 40 of the present invention.

[0047] Table 3

[0048]

[0049]

[0050] in, Figure 1 Schematic cross-sectional view of a steel cord with an outer steel wire 40 wrapped around its periphery according to the present invention. Figure 2 Schematic cross-sectional view of a steel cord without an outer steel wire 40 according to the present invention. Figure 3 It is a cross-sectional schematic diagram of the second prior art steel cord; by comparison, it can be seen that the rubber permeability of the steel cord provided by the present invention is better than that of the first prior art, which effectively improves the stability and anchoring performance of the steel cord structure.

[0051] Among them, the rubber penetration test in Table 1-3 - the lower the pressure drop, the better the rubber penetration performance, and a pressure drop of 0% means complete rubber penetration.

[0052] It can be seen from the data detected in Tables 1-3 that there is a gap between each second steel wire 21 in the steel cord of the present invention, so that the rubber can fully penetrate through the gaps between the steel cord wires and be embedded around each steel cord wire (including the first steel wire 11, the second steel wire 21 and the third steel wire 12) during vulcanization. The rubber coating rate reaches 80%, and the infiltration of the rubber viscous fluid effectively improves the adhesion between the steel cord and the rubber. In addition, this structure allows the rubber viscous fluid to penetrate into the pores between each steel cord wire of the steel cord. Therefore, each steel cord wire is covered with rubber. The density formed by the structure can prevent the intrusion of water vapor, thereby improving the corrosion resistance, fatigue resistance, impact resistance and adhesion retention of the steel cord in the tire, thereby effectively extending the service life of the tire.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A polygonal steel cord, characterized in that: The invention comprises a strand steel wire (30), wherein the strand steel wire (30) comprises a core steel wire (10) and an outer steel wire (20), wherein the outer steel wire (20) is twisted along the core steel wire (10) and uniformly distributed on the periphery of the core steel wire (10), wherein the core steel wire (10) comprises three first steel wires (11) twisted together, and the outer steel wire (20) comprises at least fifteen second steel wires (21) twisted together, and gaps exist between adjacent second steel wires (21), and the outer steel wire (20) comprises three second steel wires (21) tangent to any two adjacent first steel wires (11) in the core steel wire (10); The first steel wire (11) is formed by twisting three third steel wires (12); The diameter of the third steel wire (12) is the same as the diameter of the second steel wire (21), and the diameter of the second steel wire (21) is 0.17-0.415 mm; The cross section of the stranded steel wire (30) is a polygonal structure.

2. The polygonal steel cord according to claim 1, characterized in that: The twist direction of the first steel wire (11) is the same as the twist direction of the core steel wire (10).

3. The polygonal steel cord according to claim 2, characterized in that: The lay length of the first steel wire (11) is 0.5 times the lay length of the core steel wire (10).

4. The polygonal steel cord according to claim 1, characterized in that: The twist direction of the outer layer steel wire (20) is the same as the twist direction of the core strand steel wire (10), the twist pitch of the outer layer steel wire (20) is equal to the twist pitch of the core strand steel wire (10), and the twist pitch of the outer layer steel wire (20) is 15-23 mm.

5. The polygonal steel cord according to claim 1, characterized in that: The outer periphery of the strand steel wire (30) is wrapped with an outer wrapping steel wire (40).

6. The polygonal steel cord according to claim 5, characterized in that: The twist direction of the outer wrapping steel wire (40) is opposite to the twist direction of the strand steel wire (30).

7. The polygonal steel cord according to claim 1, characterized in that: The gap is at least 0.02 mm.

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