A straightener for flat structure steel cord production

Abstract

This invention discloses a straightening device for producing flat-structure steel cord, comprising: a mold frame; a first set of straightening rollers, including several first straightening rollers rotatably connected in the mold frame, the several first straightening rollers being arranged in upper and lower rows with staggered positions, and the grooves of the first straightening rollers being V-shaped or U-shaped; a second set of straightening rollers, including several second straightening rollers rotatably connected in the mold frame, the several second straightening rollers being arranged in upper and lower rows with staggered positions, and the second straightening rollers being ungrooved; and a third set of straightening rollers, including several third straightening rollers rotatably connected in the mold frame, the several third straightening rollers being arranged in upper and lower rows with staggered positions, and the grooves of the third straightening rollers being V-shaped; wherein the second set of straightening rollers is disposed between the first set of straightening rollers and the third set of straightening rollers. This invention can stably produce flat-structure steel cord without periodic flipping.

Description

Technical Field

[0001] This invention belongs to the field of steel cord technology, and particularly relates to a straightener for the production of flat-structure steel cord. Background Technology

[0002] Steel cord, as a reinforcing material in the radial tire skeleton, plays a crucial role in tire performance and lifespan. The prerequisite for steel cord to function as a reinforcement in a tire is effective adhesion to the tire rubber to form a composite. In the early days of radial tire use, early tire failure and its modes were not a major concern. However, with technological advancements and progress in the tire industry, competition among companies has intensified, and consumers and customers have become less tolerant of premature cord delamination and breakage. This has forced the tire industry to improve tire performance, and as a vital component of the tire skeleton, improving the performance of steel cord has become imperative.

[0003] Compared to conventional steel cords, flat steel cords have a higher degree of openness. After vulcanization with tire rubber, the rubber permeability is higher, preventing the formation of enclosed cavities within the cord. This allows for cleaner air expulsion and reduces the probability of premature corrosion of the steel cord skeleton material during tire use. Given the advantages of flat steel cords, producing cords with this structure is a major challenge for the industry. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a straightener for the production of flat-structure steel cord, which can stably produce flat-structure steel cord without periodic flipping.

[0005] To solve the above-mentioned technical problems, the present invention is implemented using the following solution: This invention provides a straightener for producing flat-structure steel cords, comprising: mold frame; The first set of straightening rollers includes several first straightening rollers rotatably connected in the mold frame. The several first straightening rollers are arranged in upper and lower rows and are staggered to each other. The groove shape of the first straightening rollers is V-shaped or U-shaped. The second set of straightening rollers includes several second straightening rollers rotatably connected in the mold frame. The several second straightening rollers are arranged in upper and lower rows and are staggered and opposite to each other. The second straightening rollers are grooveless. The third set of straightening rollers includes several third straightening rollers rotatably connected in the mold frame. The several third straightening rollers are arranged in upper and lower rows and are staggered to each other. The groove of the third straightening roller is V-shaped. The second set of straightening rollers is positioned between the first set of straightening rollers and the third set of straightening rollers. The diameter d of the second straightening roller satisfies 0.5T≤πd / 4≤T, where T is the twist pitch of the flat structure cord.

[0006] Furthermore, the depth of the V-groove is H = 0.70~0.95D, where D is the diameter of the steel cord before flattening.

[0007] Furthermore, the width of the V-groove is L=2H.

[0008] Furthermore, the width of the U-shaped groove is K = 1.1~1.25D, where D is the diameter of the cord before flattening.

[0009] Furthermore, it also includes: The push rod is located below the mold frame and can extend and retract vertically to abut against the rotating unit where the lower row of straightening rollers are located. The rotating unit where the lower row of straightening rollers are located is slidably connected to the mold frame.

[0010] Furthermore, there are at least 10 first straightening rollers.

[0011] Furthermore, there are at least three second straightening rollers.

[0012] Furthermore, there are at least 10 third straightening rollers. Beneficial effects

[0013] The present invention guides the steel cord to a grooveless second set of straightening rollers through a first set of straightening rollers to produce a flat steel cord. Finally, the flat steel cord is conveyed out without periodic flipping under the limiting position of a third set of straightening rollers with V-grooves. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a straightener for producing flat steel cords provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the V-groove straightening roller in a straightener for producing flat steel cord provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the U-shaped groove straightening roller in a straightener for producing flat steel cord provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the second straightening roller in a straightening device for producing flat steel cord provided in an embodiment of the present invention; In the diagram: 1. Mold frame; 2. First set of straightening rollers; 3. Second set of straightening rollers; 4. Third set of straightening rollers; 5. Push rod; 6. Second straightening roller. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention. Example 1

[0016] like Figures 1 to 4 As shown, this embodiment provides a straightener for producing flat-structure steel cord, comprising a mold frame 1, a first set of straightening rollers 2, a second set of straightening rollers 3, and a third set of straightening rollers 4. The first set of straightening rollers 2 consists of several first straightening rollers rotatably connected to the mold frame 1, arranged in upper and lower rows with staggered alignment. The grooves of the first straightening rollers are V-shaped or U-shaped. The second set of straightening rollers 3 consists of several second straightening rollers rotatably connected to the mold frame 1, arranged in upper and lower rows with staggered alignment. The second straightening rollers 6 are ungrooved. The third set of straightening rollers 4 consists of several third straightening rollers rotatably connected to the mold frame 1, arranged in upper and lower rows with staggered alignment. The grooves of the third straightening rollers are V-shaped. The second set of straightening rollers 3 is positioned between the first set of straightening rollers 2 and the third set of straightening rollers 4. The straightener guides the steel cord through the first set of straightening rollers 2 to the second set of straightening rollers 3 without grooves to produce flat steel cord. Finally, the flat steel cord is conveyed out without periodic flipping under the limit of the third set of straightening rollers 4 with V-grooves.

[0017] Specifically, the diameter d of the second straightening roller satisfies 0.5T≤πd / 4≤T, where T is the twist pitch of the flattened cord. The groove depth H of the V-groove is 0.70~0.95D, the groove width L is 2H, where D is the diameter of the steel cord before flattening, and the groove width K of the U-groove is 1.1~1.25D, where D is the diameter of the cord before flattening.

[0018] In addition, there are at least 10 first straightening rollers, at least 3 second straightening rollers, and at least 10 third straightening rollers. The upper row of straightening rollers is rotatably connected to the mold frame 1 in a fixed position, while the lower row of straightening rollers is rotatably connected to the mold frame 1 in a vertically movable manner. The lower row of straightening rollers and its rotating unit (including the rotating frame, rotating shaft, and other similar rotating structures) are slidably connected to the mold frame 1 in both the upper and lower parts. A push rod 5 is provided at the bottom of the mold frame 1. The push rod 5 can extend and retract vertically and abut against the rotating unit where the lower row of straightening rollers are located, thereby raising or lowering the lower row of straightening rollers without affecting their rotation. This allows for flexible adjustment of the distance between the upper and lower rows of straightening rollers, facilitating the production of flat-structure steel cord. Example 2

[0019] To produce 5×0.30 flat steel cord, the cord twist T is 15mm and the cord diameter D before flattening is 0.82mm. To produce the flat 5×0.30 cord, the straightener for producing flat steel cord described in Example 1 is used, wherein the first set of straightening rollers 2 and the third set of straightening rollers 4 are both V-shaped with a V-groove H dimension of 0.7mm, and the second set of straightening rollers 3 has a roller diameter d=15mm. Example 3

[0020] To produce 4×0.38 flat steel cord, the cord lay length T is 18mm. Before flattening, the cord diameter D is 0.84mm. To produce the flat 4×0.38 cord, a straightener for producing flat steel cord as described in Example 1 is used. The first set of straightening rollers 2 has a U-shaped groove with a U-shaped groove K dimension of 1.0mm. The third set of straightening rollers 4 has a V-shaped groove with a V-shaped groove H dimension of 0.7mm. The second set of straightener rollers 3 has a roller diameter d=15mm. Example 4

[0021] To produce 4×0.225 flat steel cord, the cord lay length T is 12mm. Before flattening, the cord diameter D is 0.54mm. To produce the flat 4×0.225 cord, a straightener for producing flat steel cord as described in Example 1 is used. The first set of straightening rollers 2 and the third set of straightening rollers 4 both have V-shaped grooves H, with a V-groove size of 0.4mm. The second set of straightening rollers 3 has a roller diameter d=10mm.

[0022] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A straightener for producing flat-structure steel cord, characterized in that, include: mold frame; The first set of straightening rollers includes several first straightening rollers rotatably connected in the mold frame. The several first straightening rollers are arranged in upper and lower rows and are staggered and opposite to each other. The groove shape of the first straightening rollers is V-shaped or U-shaped. The second set of straightening rollers includes several second straightening rollers rotatably connected in the mold frame. The several second straightening rollers are arranged in upper and lower rows and are staggered and opposite to each other. The second straightening rollers are grooveless. The third set of straightening rollers includes several third straightening rollers rotatably connected in the mold frame. The several third straightening rollers are arranged in upper and lower rows and are staggered to each other. The groove of the third straightening roller is V-shaped. The second set of straightening rollers is positioned between the first set of straightening rollers and the third set of straightening rollers. The diameter d of the second straightening roller satisfies 0.5T≤πd / 4≤T, where T is the twist pitch of the flat structure cord.

2. The straightener for producing flat-structure steel cord according to claim 1, characterized in that, When the groove shape of the first straightening roller is V-shaped, the groove depth H of the V-shaped groove of the first straightening roller and the third straightening roller is 0.70~0.95D, where D is the diameter of the steel cord before flattening treatment.

3. The straightener for producing flat-structure steel cord according to claim 1, characterized in that, The width of the U-shaped groove of the first straightening roller is K = 1.1~1.25D, where D is the diameter of the steel cord before flattening.

4. The straightener for producing flat-structure steel cord according to claim 1, characterized in that, Also includes: The push rod is located below the mold frame and can extend and retract vertically to abut against the rotating unit where the lower row of straightening rollers are located. The rotating unit where the lower row of straightening rollers are located is slidably connected to the mold frame.

5. The straightener for producing flat-structure steel cord according to claim 1, characterized in that, The first straightening rollers should consist of at least 10 rollers.

6. The straightener for producing flat-structure steel cord according to claim 1, characterized in that, There should be at least three straightening rollers.

7. The straightener for producing flat-structure steel cord according to claim 1, characterized in that, The third straightening rollers should consist of at least 10 rollers.

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