A zero-degree belt layer winding structure

Abstract

This invention provides a zero-degree belt layer winding structure, belonging to the field of tire manufacturing technology. The zero-degree belt layer is made by spirally winding two crown strips, which include a first crown strip and a second crown strip. The end of the first crown strip abuts against the beginning of the second crown strip. The zero-degree belt layer of this invention is made by spirally winding two crown strips, and two winding heads wind simultaneously, improving winding efficiency. The abutting between the end of the first crown strip and the beginning of the second crown strip ensures that there are no large gaps in the middle of the zero-degree belt layer, which not only eliminates the hard limit limitation of the winding head, but also improves the quality of the finished tire.

Description

Technical Field

[0001] This utility model belongs to the field of tire manufacturing technology, specifically relating to a zero-degree belt layer winding structure. Background Technology

[0002] 19.5-inch and 22.5-inch wide-base tires are a significant reflection of a tire company's R&D capabilities and symbolize its international standing. As among the first wide-base, low-profile tires to enter the international market, they face intense competition. To maintain this technological advantage, it's necessary to increase mileage, i.e., extend tire lifespan. With decreasing aspect ratios, the product requires a wider zero-degree winding to tighten the belt layer and prevent premature damage. Zero-degree winding technology has now been implemented, where two die heads simultaneously wind from different directions (symmetrical winding); a single die head can also wind from one direction, increasing the zero-degree belt layer width within the equipment's stroke, thereby improving product mileage.

[0003] However, both the method of symmetrical winding of two heads (Type A) and the method of unidirectional winding of a single head (Type B) have drawbacks in forming the belt layer:

[0004] 1) Type A wound belt layer structure, such as Figure 1 As shown, there are two crown strips symmetrically arranged along the center line of the belt layer drum. During winding, the two winding heads simultaneously spirally wind from the center outwards or from the sides inwards. Due to a hard limit between the two winding heads—that is, when the two winding heads are close together, there is a gap between the crown strips wound by the two winding heads—a void exists in the middle of the final zero-degree belt layer. The minimum gap is 30mm, which will result in tire blistering and zero-degree belt layer joint defects in the finished tire. Due to the hardware limit, the winding width and the number of winding turns are restricted and cannot be exceeded. The minimum starting or ending position of the two crown strips along the direction perpendicular to the center line of the belt layer drum is 30mm.

[0005] 2) Type B wound belt layer structure, such as Figure 2 As shown, a single crown belt strip is continuously bonded from one side to the other, wound by a single die head. The winding width and number of turns are unrestricted. However, because type B winding requires ≥7 turns, the stored length of the crown belt strip is insufficient to support more than 7 turns. Therefore, the crown belt strip needs to be unwound while being wound, and the winding speed cannot be too fast, otherwise it will affect the bonding tension of the crown belt strip. It takes 100 seconds to wind 20 turns of the crown belt strip, significantly reducing the winding speed and severely impacting single-tire efficiency. The minimum value of the starting and ending positions of the crown belt strip along the direction perpendicular to the center line of the belt drum is 180mm. Utility Model Content

[0006] The technical problem to be solved by this utility model is that there are gaps in the middle of the existing zero-degree belt layer winding structure and the winding efficiency is low. In order to solve the above problems, a zero-degree belt layer winding structure is provided.

[0007] This utility model is achieved in the following manner:

[0008] A zero-degree band layer winding structure, wherein the zero-degree band layer is made by spirally winding two crown band strips, the crown band strips including a first crown band strip and a second crown band strip, the end of the first crown band strip abutting the beginning of the second crown band strip.

[0009] The crown band has a width of 6.5mm to 6.7mm and a thickness of 1.7mm to 2mm.

[0010] In the axial direction of the zero-degree belt layer, the spacing between adjacent crown strips is 0~0.2mm.

[0011] The crown band is a steel wire crown band.

[0012] Compared with the prior art, the zero-degree belt layer of this utility model is made by spirally winding two crown strips, with two winding heads winding simultaneously to improve winding efficiency; the end of the first crown strip abuts against the beginning of the second crown strip to ensure that there are no large gaps in the middle of the zero-degree belt layer, which not only eliminates the hard limit limitation of the winding head, but also improves the quality of the finished tire. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a zero-degree belt layer structure formed by type A winding in the prior art.

[0014] Figure 2 This is a schematic diagram of a zero-degree belt layer structure formed by type B winding in the prior art.

[0015] Figure 3 This is a schematic diagram of the zero-degree belt layer winding structure of this utility model.

[0016] Wherein, 1 is the crown band strip; 2 is the band layer drum; 11 is the first crown band strip; 12 is the second crown band strip; 111 is the end; and 121 is the beginning. Detailed Implementation

[0017] The present invention will be further described below with reference to specific embodiments, and the advantages and features of the present invention will become clearer with the description. However, unless otherwise specified, the specific experimental methods involved in the following embodiments are conventional methods or implemented according to the conditions recommended in the manufacturer's instructions.

[0018] like Figure 3As shown, a crown strip winding structure in a zero-degree belt layer is described. The zero-degree belt layer is made by spirally winding two crown strips 1. Two winding heads wind simultaneously in the same direction to improve winding efficiency. For example, the two winding heads wind simultaneously from left to right, with the stop position of the left winding head set as the start position of the right winding head. The crown strip 1 includes a first crown strip 11 and a second crown strip 12. The end 111 of the first crown strip 11 abuts against the beginning 121 of the second crown strip 12, ensuring that there are no large gaps in the middle of the zero-degree belt layer. This not only eliminates the hard limit limitation of the winding heads but also improves the quality of the finished tire. The end position of the first crown strip 11 and the start position of the second crown strip 12 are along the direction perpendicular to the center line of the belt layer drum (…). Figure 3 The minimum value in the DD direction is 0 mm.

[0019] In the direction along the center line of the belted drum, i.e. Figure 3 In the CC direction, the end 111 of the first crown band 11 and the beginning 121 of the second crown band 12 are connected end to end.

[0020] In the axial direction of the zero-degree belt layer, that is, in the direction perpendicular to the center line of the belt layer drum, Figure 3 In the DD direction, the spacing between adjacent crown strips is 0~0.2mm.

[0021] The crown band is spirally wound on the belt layer drum to form a zero-degree belt layer.

[0022] The crown strip 1 has a width of 6.5mm to 6.7mm and a thickness of 1.7mm to 2mm, preferably a width of 6.5mm and a thickness of 1.8mm.

[0023] The crown band 1 is a steel wire crown band.

[0024] The zero-degree belt layer winding structure of this utility model is prepared by the following steps:

[0025] 1) A crown strip is spirally wound on the surface of a cylindrical belt drum using a crown strip winding device (manufacturer: Qingdao Soft Control Electromechanical Engineering Co., Ltd.).

[0026] 2) On the HMI touch screen (model: FPM-215-R8AE) of the crown strip wrapping device, select the bonding mode and set the parameters: ① Select the wrapping start angle of 1° (the default is 0° corresponding to the center line of the tire crown);

[0027] ② Set the starting position of the left and right machine heads in the horizontal direction.

[0028] The parameters of the first crown strip's bonding start position and wrapping distance are set normally. The bonding start position, wrapping distance, and bonding trajectory of the second crown strip are calculated separately and are no longer referenced to the parameters of the first crown strip for bonding.

[0029] The starting position of the left front end is set according to the positioning light indicator on the crown strip.

[0030] The starting position of the right head is set according to the number of winding turns and width. The distance between the end 111 of the first crown strip 11 and the beginning 121 of the second crown strip 12 is finely adjusted by the overlap of the first crown strip and the second crown strip winding joint, and the starting position of the right head is re-determined. For example, when the overlap of the first crown strip and the second crown strip winding joint is 30mm, the starting position of the right head is moved down 30mm along the direction of the center line of the belt layer drum, so that the end 111 of the first crown strip 11 abuts against the beginning 121 of the second crown strip 12. If the first crown strip and the second crown strip winding joint do not overlap, and the distance between the end 111 of the first crown strip 11 and the beginning 121 of the second crown strip 12 is 30mm, the starting position of the right head is adjusted to move up towards the end of the first crown strip 11 along the direction of the center line of the belt layer drum, so that the end 111 of the first crown strip 11 abuts against the beginning 121 of the second crown strip 12.

[0031] ③ Lateral pitch: The lateral pitch is defined as the distance the winding machine head travels along the crown strip for each turn. Figure 3 The distance moved in the DD direction; the lateral pitch is set according to the actual width of the crown strip ±0.2mm to ensure that... Figure 3 In the DD direction, the spacing between adjacent crown strips 1 is 0~0.2mm.

[0032] ④ Determining the winding direction: Set the transverse pitch to a negative value, and the crown strip will be wound and attached from left to right; set the transverse pitch to a positive value, and the crown strip will be wound and attached from right to left. Here, positive and negative indicate the running direction of the machine head and do not affect the numerical value.

[0033] 3) Crown band wrapping

[0034] The pressure roller of the winding head contacts the surface of the cylindrical belt layer drum according to the set tension value. According to the set parameters, the two winding heads start spiral winding in the same direction at a speed of 1500mm / s, that is, the two winding heads wind from left to right at the same time, or from right to left at the same time. The tension system maintains a constant tension. According to the set winding distance, the spiral winding is completed, and the speed decreases until the end.

[0035] 4) Cutting and Spacing Control

[0036] The crown strip is cut according to the set number of feeds from the winding head and the bonding distance after cutting. Spacing control: The winding spacing of the crown strip is controlled by setting the lateral pitch in the HMI recipe interface.

[0037] A comparison is made between the type A and type B winding methods in the background art and the winding method of the zero-degree belt layer of this utility model in terms of winding speed and efficiency.

[0038]

[0039] In summary, the zero-degree belt layer winding method of this utility model, by changing the operating mode of the winding head, ensures that the winding width and number of winding turns of the zero-degree belt layer are not limited by the hard limits of the equipment. The winding speed will not decrease like the B-type winding method, and the winding speed can be kept consistent with the A-type winding speed. This increases the number of winding turns and winding speed of the zero-degree belt layer, and ensures that there are no large gaps in the middle of the zero-degree belt layer. It is not limited by hardware limits, and can ensure winding speed and efficiency, thereby improving single tire efficiency and finished tire quality.

[0040] It is worth noting that the hard limit is as follows: In the A-type winding method, there are two winding heads. When both winding heads are running near the center line of the belt layer drum, the two winding heads will be close together. Due to the hardware protection measures of the winding heads, there is a gap between the crown strips wound by the two winding heads. This results in a gap in the middle of the final zero-degree belt layer. Near the center line of the belt layer drum, there is a gap between the termination positions of the first and second crown strips. Figure 1 The minimum limit value E shown is 30 mm.

[0041] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A zero-degree belt winding structure, characterized by, The zero-degree band layer is made of two crown band strips (1) spirally wound together. The crown band strip (1) includes a first crown band strip (11) and a second crown band strip (12). The end (111) of the first crown band strip (11) abuts against the beginning (121) of the second crown band strip (12).

2. A zero-degree belt winding structure according to claim 1, wherein The crown strip (1) has a width of 6.5mm to 6.7mm and a thickness of 1.7mm to 2mm.

3. A zero-degree belt winding structure according to claim 2, wherein In the axial direction of the zero-degree belt layer, the spacing between adjacent crown strips (1) is 0~0.2mm.

4. The zero-degree belt winding structure of claim 3, wherein, The crown band (1) is a steel wire crown band.

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