A 2+2 ut steel cord and a process for its production

Abstract

The application discloses a 2+2 UT steel wire cord forming support and a cord forming process thereof, which comprises a support body, a core strand deformation assembly, a surface wire deformation assembly and a wire collecting nozzle arranged on the support body, the core strand deformation assembly comprises a core strand pre-deformation wheel and a core strand guide wheel set matched with the core strand pre-deformation wheel, the surface wire deformation assembly comprises two symmetrically arranged surface wire pre-deformation wheels and two groups of surface wire guide wheel sets matched with the surface wire pre-deformation wheels, the core strand pre-deformation wheel and the surface wire pre-deformation wheel are both provided with a wire passing part in contact with a wire body, the cross section of the wire passing part is a regular polygon, and the number of sides of the cross section of the wire passing part of the core strand pre-deformation wheel is less than that of the wire passing part of the surface wire pre-deformation wheel. The core strand steel wire and the surface wire steel wire are subjected to different degrees of pre-deformation treatment, so that the problem that the cord is loose and curved due to uneven stress of the core strand and the surface wire in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of 2+2 UT steel cord production, in particular to a 2+2 UT steel cord forming support and a forming process thereof. BACKGROUND

[0002] 2+2 UT is a UT specification developed in the field of steel cord, which has been continuously used in tires. Its very high strength can effectively improve the strength of the tire belt and the safety performance of the tire, reduce the amount of steel cord in the tire, reduce the rolling resistance, and reduce the cost. The single wire strength exceeds 3500N / mm²,

[0003] In the twisting process of 2+2 UT steel cord, the core strand is formed by twisting two core wires together, and two face wires are twisted together outside the core strand. Due to the small twist pitch and the influence of geometric structure characteristics, forming problems are prone to occur during twisting. At present, there is no fixed process for the production of this structure, and the steel wire is generally twisted into a rope at the forming point after pre-deformation by using a rope forming support. During the twisting process, the stress of the core strand and the face wire in the cord is large and unevenly distributed, and the stress distribution needs to be adjusted by a virtual twister and a straightener. If the degree of uneven stress exceeds the adjustment range of the virtual twister and the straightener, the cord forming will be loose and curved. SUMMARY

[0004] The purpose of the present application is to provide a 2+2 UT steel cord forming support and a forming process thereof, which overcomes the problem of loose and curved cord forming caused by uneven stress of the core strand and the face wire in the prior art by pre-deforming the core strand wire and the face wire to different degrees.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is: a 2+2 UT steel cord forming support, comprising a support body, a core strand deformation assembly, a face wire deformation assembly and a wire collecting nozzle are arranged on the support body, the core strand deformation assembly comprises a core strand pre-deformation wheel and a core strand guide wheel set matched with the core strand pre-deformation wheel, the face wire deformation assembly comprises two symmetrically arranged face wire pre-deformation wheels and two sets of face wire guide wheel sets matched with the face wire pre-deformation wheels, the core strand pre-deformation wheel and the face wire pre-deformation wheel are both provided with a wire passing portion in contact with the wire body, the cross section of the wire passing portion is a regular polygon, and the number of sides of the cross section of the wire passing portion of the core strand pre-deformation wheel is less than that of the face wire pre-deformation wheel.

[0006] In a further improved embodiment of the present application, the core strand guide wheel set comprises a first guide wheel and a third guide wheel arranged on both sides of the core strand pre-deformation wheel respectively, and a second guide wheel located above the core strand pre-deformation wheel. The core strand passes through the wire collecting nozzle after winding around the first guide wheel, the second guide wheel, the third guide wheel and the core strand pre-deformation wheel.

[0007] Further, the two groups of the face thread guide wheel sets are symmetrically arranged, and the face thread pre-deformation wheel is arranged between the fourth guide wheel and the fifth guide wheel, and the face thread passes through the fourth guide wheel, the fifth guide wheel and the face thread pre-deformation wheel and then enters the thread collecting nozzle.

[0008] Further, the first guide wheel, the second guide wheel, the third guide wheel and the core strand pre-deformation wheel are vertically arranged and are rotationally connected to the frame body.

[0009] Further, the two fourth guide wheels are oppositely inclined, the two fifth guide wheels are horizontally arranged, the two face thread pre-deformation wheels are oppositely inclined, and the fourth guide wheel, the fifth guide wheel and the face thread pre-deformation wheel are rotationally arranged on the frame body.

[0010] Further, the first guide wheel, the second guide wheel, the third guide wheel, the fourth guide wheel and the fifth guide wheel are all provided with V-shaped anti-falling grooves on the wheel surfaces.

[0011] Further, the core strand pre-deformation wheel and the face thread pre-deformation wheel both include a rotating shaft part, the wire passing part is arranged at one end of the rotating shaft part, and anti-falling stop rings are arranged on both sides of the wire passing part.

[0012] Further, the wire passing part of the face thread pre-deformation wheel is circular in cross section.

[0013] A 2+2 UT steel wire cord forming process utilizes the cord forming support as described above to form a cord, four steel wires are unwound from a spool, two of the steel wires are preliminarily twisted into a core strand and then pass through a core strand pre-deformation wheel, the other two steel wires pass through a face thread pre-deformation wheel respectively and then enter a pressing die together with the core strand, and then pass through a guide wheel, a first straightener, a virtual twister, a second straightener and a traction wheel in sequence to form a cord.

[0014] The present application has the following advantages:

[0015] The present application can overcome the problem that the core strand and the face thread stress is uneven in the prior art, so that the stress distribution tends to be uniform after re-entering the virtual twister for twisting and untwisting, and the cord forming quality is improved.

[0016] The core strand pre-deformation wheel and the face thread pre-deformation wheel can be replaced as needed, and the number of edges of the cross section of the wire passing part can be selected as needed, so that the degree of flexibility is high, and the adjustment and maintenance are convenient. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural side view schematic diagram of the present application.

[0018] Figure 2 It is a core strand pre-deformation wheel structure schematic diagram of the present application.

[0019] Figure 3 It is a wiring overhead view schematic diagram of the present application.

[0020] Figure 4 It is a twisting process winding schematic diagram of the present application.

[0021] In the figure, 1 is a frame body, 2 is a wire collecting nozzle, 3 is a core strand pre-deformation wheel, 4 is a face wire pre-deformation wheel, 5 is a wire passing part, 6 is a first guide wheel, 7 is a second guide wheel, 8 is a third guide wheel, 9 is a fourth guide wheel, 10 is a fifth guide wheel, 11 is a rotating shaft part, 12 is a anti-falling block, 13 is a face wire herringbone wheel, 14 is a core wire herringbone wheel, 15 is a guide wheel, 16 is a first straightener, 17 is a virtual twister, 18 is a second straightener, and 19 is a traction wheel. DETAILED DESCRIPTION

[0022] The present application is further illustrated below in combination with the accompanying drawings and specific embodiments.

[0023] Embodiment 1: in combination with Figures 1-4 It can be known that a 2+2 UT steel wire cord forming support and its forming process, including a frame body 1, the frame body 1 is provided with a core strand deformation assembly, a face wire deformation assembly and a wire collecting nozzle 2, the core strand deformation assembly includes a core strand pre-deformation wheel 3 and a core strand guide wheel set matched with the core strand pre-deformation wheel 3, the face wire deformation assembly includes two symmetrically arranged face wire pre-deformation wheels 4 and two sets of face wire guide wheel sets matched with the face wire pre-deformation wheels 4, the core strand pre-deformation wheel 3 and the face wire pre-deformation wheel 4 are both provided with a wire passing part 5 in contact with the wire body, the cross section of the wire passing part 5 is a regular polygon, the number of sides of the cross section of the wire passing part 5 of the core strand pre-deformation wheel 3 is less than that of the wire passing part 5 of the face wire pre-deformation wheel 4.

[0024] The core strand guide wheel set includes a first guide wheel 6 and a third guide wheel 8 respectively arranged on both sides of the core strand pre-deformation wheel 3, and a second guide wheel 7 located above the core strand pre-deformation wheel, the core strand passes through the wire collecting nozzle 2 after winding around the first guide wheel 6, the second guide wheel 7, the third guide wheel 8 and the core strand pre-deformation wheel 3.

[0025] The two sets of face wire guide wheel sets are symmetrically arranged, which include a fourth guide wheel 9 and a fifth guide wheel 10 arranged on one side of the first guide wheel 6, the face wire pre-deformation wheel 4 is arranged between the fourth guide wheel 9 and the fifth guide wheel 10, and the face wire passes through the wire collecting nozzle 2 after winding around the fourth guide wheel 9, the fifth guide wheel 10 and the face wire pre-deformation wheel 4.

[0026] The fifth guide wheel 10 is located on one side of the wire collecting nozzle 2, and the fourth guide wheel 9 is located on the side of the fifth guide wheel 10 away from the wire collecting nozzle 2.

[0027] The first guide wheel 6, the second guide wheel 7, the third guide wheel 8 and the core strand pre-deformation wheel 3 are vertically arranged and are rotationally connected to the frame body 1.

[0028] The two fourth guide wheels 9 are oppositely inclined, the two fifth guide wheels 10 are horizontally arranged, and the two face strand pre-deformation wheels 4 are oppositely inclined, and the fourth guide wheels 9, the fifth guide wheels 10 and the face strand pre-deformation wheels 4 are rotationally arranged on the frame body 1.

[0029] The wheel surface of the first guide wheel 6, the second guide wheel 7, the third guide wheel 8, the fourth guide wheel 9 and the fifth guide wheel 10 is provided with a V-shaped anti-falling groove.

[0030] The core strand pre-deformation wheel 3 and the face strand pre-deformation wheel 4 each include a rotating shaft part 11, and the wire passing part 5 is arranged at one end of the rotating shaft part 11 and is provided with an anti-falling stop ring 12 on both sides.

[0031] Optionally, the cross section of the wire passing part 5 of the face strand pre-deformation wheel 4 is circular (since a circle has infinite vertices and infinite edges, it can be said that a circle is an infinite-sided regular polygon, which is also a regular polygon).

[0032] A 2+2 UT steel wire cord forming process utilizes the cord forming support of the application: four steel wires are unwound from a spool, two of which are preliminarily twisted into a core strand and then pass through the core strand pre-deformation wheel 3, and the other two pass through the face strand pre-deformation wheel 4 respectively and then enter the mold together with the core strand, and then pass through the guide wheel 15, the first straightener 16, the virtual twister 17, the second straightener 18 and the traction wheel 19 in sequence to form the cord.

[0033] The working principle of the cord forming support of the 2+2 UT steel wire cord provided by the application is as follows: in operation, the core strand passes through the first guide wheel 6, the second guide wheel 7, the third guide wheel 8 and the core strand pre-deformation wheel 3 and then enters the wire collecting nozzle 2, and the face strand passes through the fourth guide wheel 9, the fifth guide wheel 10 and the face strand pre-deformation wheel 4 and then enters the wire collecting nozzle 2. Different degrees of pre-deformation treatment are performed on the core strand steel wire and the face strand steel wire by using the different cross-sectional edge numbers of the wire passing parts 5 of the core strand pre-deformation wheel 3 and the face strand pre-deformation wheel 4 to overcome the problem of loose and curved cord forming caused by uneven stress of the core strand and the face strand in the prior art.

[0034] In the description of the application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. Any equivalent structure or equivalent flow transformation made by using the content of the specification and drawings, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the application.

Claims

1. A rope-forming support for 2+2 UT steel wire cords, characterized in that: The system includes a frame (1), on which a core strand deformation assembly, a surface thread deformation assembly, and a wire gathering nozzle (2) are provided. The core strand deformation assembly includes a core strand pre-deformation wheel (3) and a core strand guide wheel assembly that cooperates with the core strand pre-deformation wheel (3). The surface thread deformation assembly includes two symmetrically arranged surface thread pre-deformation wheels (4) and two sets of surface thread guide wheel assemblies that cooperate with the surface thread pre-deformation wheels (4). Both the core strand pre-deformation wheel (3) and the surface thread pre-deformation wheel (4) are provided with... The thread-passing part (5) that contacts the thread body has a cross-section that is a regular polygon. The number of sides of the cross-section of the thread-passing part (5) of the core strand pre-deformation wheel (3) is less than the number of sides of the cross-section of the thread-passing part (5) of the surface thread pre-deformation wheel (4). Both the core strand pre-deformation wheel (3) and the surface thread pre-deformation wheel (4) include a rotating shaft (11). The thread-passing part (5) is located at one end of the rotating shaft (11), and anti-detachment rings (12) are provided on both sides of the thread-passing part (5).

2. The rope-forming support for a 2+2 UT steel wire cord according to claim 1, characterized in that: The core strand guide wheel assembly includes a first guide wheel (6) and a third guide wheel (8) respectively disposed on both sides of the core strand pre-deformation wheel (3), and a second guide wheel (7) located above the core strand pre-deformation wheel. The core strand passes around the first guide wheel (6), the second guide wheel (7), the third guide wheel (8) and the core strand pre-deformation wheel (3) and then passes into the cable feed nozzle (2).

3. The rope-forming support for a 2+2 UT steel wire cord according to claim 2, characterized in that: The two sets of surface guide wheels are symmetrically arranged, including a fourth guide wheel (9) and a fifth guide wheel (10) arranged on one side of the first guide wheel (6). The surface pre-deformation wheel (4) is arranged between the fourth guide wheel (9) and the fifth guide wheel (10). The surface thread passes through the wire feed nozzle (2) after passing around the fourth guide wheel (9), the fifth guide wheel (10) and the surface pre-deformation wheel (4).

4. The rope-forming support for a 2+2 UT steel wire cord according to claim 2, characterized in that: The first guide wheel (6), the second guide wheel (7), the third guide wheel (8) and the core strand pre-deformation wheel (3) are all vertically arranged and rotatably connected to the frame (1).

5. The rope-forming support for a 2+2 UT steel wire cord according to claim 3, characterized in that: The two fourth guide wheels (9) are inclined towards each other, the two fifth guide wheels (10) are horizontal, and the two surface pre-deformation wheels (4) are inclined towards each other. The fourth guide wheel (9), the fifth guide wheel (10) and the surface pre-deformation wheel (4) are all rotatably mounted on the frame (1).

6. The rope-forming support for a 2+2 UT steel wire cord according to claim 3, characterized in that: The first guide wheel (6), the second guide wheel (7), the third guide wheel (8), the fourth guide wheel (9) and the fifth guide wheel (10) are all provided with V-shaped anti-detachment grooves on their wheel surfaces.

7. The rope-forming support for a 2+2 UT steel wire cord according to claim 1, characterized in that: The cross-section of the thread-passing part (5) of the pre-deformed surface wheel (4) is circular.

8. A rope-forming process for 2+2 UT steel wire cords, utilizing the rope-forming support as described in claim 1, characterized in that: Four steel wires are released from the H-beam reel. Two of the steel wires are initially twisted into a core strand and then pass through the core strand pre-deformation wheel (3). The other two steel wires pass through the surface thread pre-deformation wheel (4) and then enter the pressing mold together with the core strand. They then pass through the guide wheel (15), the first straightener (16), the virtual twister (17), the second straightener (18), and the traction wheel (19) in sequence to form a cord.

Images