Multi-layer high-strength steel cord

Abstract

The utility model discloses a multi-layer high-strength steel cord. The multi-layer high-strength steel cord comprises a core strand located at the innermost part; the outer layer is wound on the outer side of the core strand layer at a fixed lay length and comprises six outer strands; the outer winding wire is wound on the outer side of the outer layer at a fixed lay length; wherein each of the core strand and the outer strand comprises a core strand layer, a middle strand layer uniformly twisted on the outer side of the core strand layer and an outer strand layer uniformly twisted on the outer side of the middle strand layer, the core strand layer comprises three core monofilaments, the middle strand layer comprises nine middle monofilaments, the outer strand layer comprises fifteen outer monofilaments, and the outer strand layer comprises five outer monofilaments. The twisting directions of the core strand layer, the middle strand layer and the outer strand layer are the same, and the diameters of the core monofilaments, the middle monofilaments and the outer monofilaments are the same and are larger than the diameter of the outer winding filaments. By adopting the high-strength steel wires and selecting the specific diameter, the twisting direction and the twisting length, the wear-resistant tire disclosed by the utility model can meet the use environment of a heavy-load tire, realize the wear-resistant effect and prolong the service life of the tire, and is more excellent in the calendering and using processes of the tire.

Description

Technical Field

[0001] The utility model relates to the technical field of steel cords, in particular to a high-strength steel cord for reinforcing off-road tires. Background Art

[0002] With the development of technology and production capacity in my country's tire industry, the market has put forward higher requirements for tire durability, safety and high-speed performance. New requirements have also been put forward for the development and application of steel cords as tire skeleton materials. During the use or driving of heavy-duty tires, the cords are subjected to very heavy loads, which cause wear and corrosion to the cords, and the tire tread will be worn and torn, affecting the service life. Therefore, a steel cord product with higher use strength is needed to meet market demand. Utility Model Content

[0003] The utility model aims to avoid the shortcomings of the prior art and provides a high-strength off-road tire high-strength steel cord with a multi-layer structure.

[0004] The utility model solves the technical problem by adopting the following technical solution: a high-strength steel cord for off-road tires, comprising:

[0005] The innermost core strand;

[0006] An outer layer wound on the outside of the core strand at a fixed lay length, the outer layer comprising six outer strands;

[0007] An outer winding wire is wound on the outside of the outer layer with a fixed lay length;

[0008] Among them, the core strands and the outer strands both include a core strand layer, an intermediate strand layer uniformly twisted on the outside of the core strand layer, and an outer strand layer uniformly twisted on the outside of the intermediate strand layer. The core strand layer includes three core monofilaments, the intermediate strand layer includes nine intermediate monofilaments, and the outer strand layer includes fifteen outer monofilaments. The twist directions of the core strand layer, the intermediate strand layer and the outer strand layer are the same, and the diameters of the core monofilaments, the intermediate monofilaments and the outer monofilaments are the same and are larger than the diameter of the outer winding wire.

[0009] In some embodiments, the twist direction of the core monofilament, the middle monofilament and the outer monofilament is Z twist.

[0010] In several embodiments, the diameters of the core monofilament, the middle monofilament and the outer monofilament are 0.28±0.01 mm, and the twist length of the core monofilament is 6.3 mm.

[0011] In several embodiments, the lay length of the intermediate monofilament is 12.5 mm.

[0012] In several embodiments, the lay length of the outer monofilament is 18 mm.

[0013] In several embodiments, the diameter of the outer winding wire is 0.15±0.01 mm, the lay length of the outer winding wire is 5 mm, and the twist direction of the outer winding wire is S twist.

[0014] In several embodiments, the steel cord has a diameter of 5.1-5.8 mm.

[0015] In several embodiments, the twist direction of the outer layer is Z twist, and the lay length of the outer layer is 55 mm.

[0016] In several embodiments, the breaking force of the steel cord is greater than or equal to 30000N.

[0017] The utility model has the following beneficial effects:

[0018] The utility model adopts ultra-high strength steel wire, a multi-layer and multi-number composite structure, and through the selection of specific diameter, twist direction and twist pitch, it can meet the use environment of large-load tires, achieve wear resistance, extend its service life, and perform better during tire calendering and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are for illustrative purposes only of selected embodiments and do not represent all possible implementations, and should not be considered to limit the scope of the present invention.

[0020] Figure 1 The cross-sectional structure of the multi-layer high-strength steel cord in this embodiment is schematically shown;

[0021] Figure 2 The enlarged structure of the core strands of the multi-layer high-strength steel cord in this embodiment is schematically shown. DETAILED DESCRIPTION

[0022] Below, embodiments of the present invention are described in detail with reference to the accompanying drawings. To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in conjunction with the accompanying drawings is not intended to limit the scope of the present invention for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0024] Example 1

[0025] like Figure 1-Figure 2 As shown, the multi-layer high-strength steel cord in this embodiment is mainly composed of an innermost core strand 10, an outer layer 20 wound on the outside of the core strand 10 with a fixed twist pitch, and an outer winding filament 30 wound on the outside of the outer layer 20 with a fixed twist pitch.

[0026] Specifically, the outer layer 20 includes six outer strands 21, the core strands 10 and the outer strands 21 each include a core strand layer 11, an intermediate strand layer 12 uniformly twisted on the outside of the core strand layer 11, and an outer strand layer 13 uniformly twisted on the outside of the intermediate strand layer 12, the core strand layer 11 includes three core filaments 111 distributed in an equilateral triangle, the intermediate strand layer 12 includes nine intermediate filaments 121 distributed in a circular array, the outer strand layer 13 includes fifteen outer filaments 131 distributed in a circular array, the core strand layer 11, the intermediate strand layer 12 and the outer strand layer 13 have the same twist direction, the core filaments 111, the intermediate filaments 121 and the outer filaments 131 have the same diameter and are larger than the diameter of the outer winding 30.

[0027] The twist direction of the core filament 111 , the intermediate filament 121 , and the outer filament 131 is Z twist.

[0028] Furthermore, the diameters of the core monofilament 111, the intermediate monofilament 121 and the outer monofilament 131 are 0.28±0.01 mm, the twist length of the core monofilament 111 is 6.3 mm, the twist length of the intermediate monofilament 121 is 12.5 mm, and the twist length of the outer monofilament 131 is 18 mm.

[0029] Correspondingly, the twist direction of the outer layer 20 is Z twist, and the twist length of the outer layer 20 is 55 mm.

[0030] Furthermore, the diameter of the outer winding wire 30 is 0.245±0.01 mm, the twist pitch of the outer winding wire 30 is 5 mm, and the twist direction of the outer winding wire 30 is S twist.

[0031] The diameter of the steel cord thus formed is 5.1-5.8 mm, and the breaking force of the steel cord is greater than or equal to 30000N.

[0032] The following results were obtained by comparing the previous similar products of our company with the examples of this application:

[0033]

[0034] It can be learned from the above comparative data that in this embodiment, through the reasonable selection and design of steel wire diameter, lay pitch and lay direction, the breaking force can be significantly improved, and the cord penetration is also slightly improved, which has been substantially verified in the use of off-road tires and meets the use requirements of higher load off-road tires.

[0035] The present invention describes preferred embodiments, including the best way to carry out the present invention known to the inventor. Of course, it is obvious to those skilled in the art that these preferred embodiments will be changed. The inventors anticipate that the skilled artisans may use the changes as appropriate, and the inventors point out that the present invention may be implemented in other ways than those specifically described above. Therefore, the present invention includes all improvements included in the subject matter and scope of the present invention as defined by the claims. Moreover, unless otherwise stated or clearly contradictory in content, the present invention includes any of the above factors and all possible changes thereof.

Claims

1. A multi-layer high-strength steel cord, characterized in that: include: The innermost core strand; An outer layer wound on the outside of the core strand at a fixed lay length, the outer layer comprising six outer strands; An outer winding wire is wound on the outside of the outer layer with a fixed lay length; Among them, the core strands and the outer strands both include a core strand layer, an intermediate strand layer uniformly twisted on the outside of the core strand layer, and an outer strand layer uniformly twisted on the outside of the intermediate strand layer. The core strand layer includes three core monofilaments, the intermediate strand layer includes nine intermediate monofilaments, and the outer strand layer includes fifteen outer monofilaments. The twist directions of the core strand layer, the intermediate strand layer and the outer strand layer are the same, and the diameters of the core monofilaments, the intermediate monofilaments and the outer monofilaments are the same and are larger than the diameter of the outer winding wire.

2. A multi-layer high-strength steel cord according to claim 1, characterized in that: The twist direction of the core monofilament, the middle monofilament and the outer monofilament is Z twist.

3. A multi-layer high-strength steel cord according to claim 2, characterized in that: The diameters of the core monofilament, the middle monofilament and the outer monofilament are 0.28±0.01 mm, and the twist length of the core monofilament is 6.3 mm.

4. A multi-layer high-strength steel cord according to claim 2, characterized in that: The lay length of the intermediate monofilament is 12.5 mm.

5. The multi-layer high-strength steel cord according to claim 2, characterized in that: The lay length of the outer monofilament is 18 mm.

6. A multi-layer high-strength steel cord according to claim 2, characterized in that: The diameter of the outer winding wire is 0.245±0.01 mm, the twist pitch of the outer winding wire is 5 mm, and the twist direction of the outer winding wire is S twist.

7. A multi-layer high-strength steel cord according to claim 2, characterized in that: The diameter of the steel cord is 5.1-5.8 mm.

8. The multi-layer high-strength steel cord according to claim 2, characterized in that: The twist direction of the outer layer is Z twist, and the twist length of the outer layer is 55 mm.

9. The multi-layer high-strength steel cord according to claim 1, characterized in that: The breaking force of the steel cord is greater than or equal to 30000N.

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