Tire blank roller press

Abstract

The utility model provides a tire blank roller press. The tire blank rolling machine comprises a forming drum and rolling equipment, and the rolling equipment at least comprises a tread roller set used for tread rolling of a tire blank and an auxiliary tread roller set used for assisting tread rolling forming of the tire blank. The tread roller set and the auxiliary tread roller set are distributed in the circumferential direction of the forming drum. During rolling, the left tread roller and the right tread roller of the tread roller group are respectively pushed from the center of the tread to the tire shoulders on respective sides; the auxiliary tread roller group comprises tread shaping rollers and two groups of tire shoulder shaping rollers, and the two groups of tire shoulder shaping rollers respectively belong to the two sides of the tread shaping rollers and correspond to tire shoulders on the two sides. According to the tire blank roller press, rolling of a tire blank tread and timely shaping in the rolling process are achieved through the tread roller set and the auxiliary tread roller set which are arranged separately, the tread rolling quality is improved, the section shape of the rolled tread is accurately controlled, uniform distribution of tire blank rubber is guaranteed, and the tire blank rolling quality is improved. And good dynamic balance of the rolled tire blank is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of tire molding, in particular to a tire blank rolling machine. Background Art

[0002] The production process of tires involves multiple processes, including extrusion of semi-components, calendering, tire blank molding, vulcanization, etc. Due to the elasticity of rubber, the extrusion process involves extrusion expansion and cooling contraction. Rolling of the tire blank before vulcanization is a process of precise control and shaping of the tire blank. The rolling process must not only ensure the consistency of the tire blank cross-section after rolling with the target tire blank contour through reasonable rolling parameter design, and the expected flow distribution of the rubber, but also avoid unexpected displacement and deformation of other parts in the tire blank.

[0003] The utility model patent application with publication number CN113478879A and titled "Tire Tread Rolling Device, System and Control Method" discloses a tread rolling device, and the utility model patent application with publication number CN208497737U and titled "A Pressing Roller Device" also discloses a green tire rolling device. The above-mentioned disclosed rolling devices all have corresponding tread rollers for tread rolling. In these prior arts, the pressing rollers may be multi-purpose, that is, it is possible to take into account the rolling operation of other green tire areas at the same time. However, in the prior arts, without exception, the forming rollers used for the rolling forming operation of the tread are all independent, and generally only one set of pressing rollers is provided. Similar rolling structures were found in production tests to be not well suited for the molding of large-sized load-bearing tires such as all-steel load-bearing tires. During the rolling process of large-sized tires with thicker tread rubber, it is difficult for a single set of rollers to accurately control the thickness distribution of the tread rubber, resulting in a large deviation between the cross-sectional shape of the tread after rolling and the expected shape. In addition, there are also problems such as asymmetric distribution of the rubber on the left and right sides of the tire and failure to meet the dynamic balance standards of the tire. Utility Model Content

[0004] In order to realize accurate rolling forming of a green tire, the utility model provides a green tire rolling machine.

[0005] The utility model provides a green tire rolling machine, comprising a forming drum and a rolling device, characterized in that the rolling device at least comprises a tread roller group for rolling the tread of the green tire and an auxiliary tread roller group for assisting the tread rolling and molding of the green tire;

[0006] The tread roller group and the auxiliary tread roller group are distributed along the circumference of the forming drum;

[0007] The tread roller group includes a left tread roller and a right tread roller, and the rolling positions and rolling postures of the two rollers can be controlled and adjusted; during rolling, the left tread roller and the right tread roller are respectively pushed from the center of the tread to the shoulder on one side of each side;

[0008] The auxiliary tread roller group includes a tread shaping roller for shaping the blank at the crown of the tread and a shoulder shaping roller for shaping the blank at the shoulder of the tread. The shoulder shaping rollers are divided into two groups, belonging to both sides of the tread shaping roller and corresponding to the shoulders on both sides.

[0009] Preferably, the tread shaping roller and the shoulder shaping roller have a circumferential section matching the expected tread shape.

[0010] Preferably, the positions and postures of the tread shaping roller and the shoulder shaping roller can be controlled and adjusted during rolling.

[0011] Preferably, both the tread shaping roller and the shoulder shaping roller can be telescopically adjusted along the tread direction pointing to the green tire.

[0012] Preferably, the rolling equipment further comprises a sidewall roller set, wherein the sidewall roller set comprises two sidewall rollers respectively belonging to the two sides of the forming drum tread, and any one of the sidewall rollers is used for rolling and shaping the sidewall on the same side.

[0013] Preferably, the tread roller group, the sidewall roller group and the auxiliary tread roller group are sequentially arranged in layers along the circumference of the forming drum.

[0014] The utility model realizes rolling of the green tire tread and timely shaping during the rolling process by means of a tread roller group and an auxiliary tread roller group which are separately arranged, which is beneficial to improving the quality of tread rolling, accurately controlling the cross-sectional shape of the tread after rolling, ensuring uniform distribution of rubber material of the green tire, and ensuring good dynamic balance of the green tire after rolling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a tire green rolling machine of the utility model;

[0016] Figure 2 It is a cross-sectional schematic diagram of the tire green rolling machine of the utility model along the AA direction;

[0017] Figure 3 It is a cross-sectional schematic diagram of the green tire rolling machine of the utility model along the BB direction;

[0018] Figure 4 It is a schematic cross-sectional view along the CC direction of the tire green rolling machine of the present invention.

[0019] In the figure:

[0020] 1: forming drum; 2: rolling equipment; 21: tread roller group; 211: left tread roller; 212: right tread roller; 22: auxiliary tread roller group; 221: tread shaping roller; 222: shoulder shaping roller; 23: sidewall roller group; 231: sidewall roller. DETAILED DESCRIPTION

[0021] The following is a detailed description of the present invention in conjunction with the accompanying drawings and specific embodiments. In this specification, the dimensions of the drawings do not represent the actual dimension ratios. The drawings are only used to reflect the relative position relationship and connection relationship between the components. Components with the same name or the same number represent similar or identical structures and are only for illustrative purposes.

[0022] Figure 1 The schematic diagram of the structure of the green tire rolling machine of the utility model comprises a forming drum 1 for green tire molding and a rolling device 2 matched with the forming drum 1. The rolling device 2 comprises at least a tread roller group 21 for rolling the tread of the green tire and an auxiliary tread roller group 22 for assisting the tread rolling molding of the green tire. In the prior art, the position and posture of the tread roller group 21 are controlled and adjustable, and the tread portion of the green tire bonded to the forming drum 1 rotates during the rolling operation so as to roll the tread rubber material into a predetermined shape. The adjustment method of the position and posture of the tread roller group 21 belongs to the content that has been disclosed in the prior art, and this application will not repeat it. For example, such as controlling the tread roller group 21 to extend from the rolling device 2 by a cylinder, a hydraulic cylinder, etc., and driving the tread roller group 21 to move axially along the molding drum 1 based on a ball screw mechanism. Correspondingly, the position and posture control of other rollers in the rolling device 2 are similar and can be implemented based on the prior art.

[0023] Figure 2 for Figure 1 Schematic diagram of the cross section along the AA direction in the middle. This gives a schematic diagram of the tread roller group 21 rolling on the surface of the forming drum 1. The tread roller group 21 includes a left tread roller 211 and a right tread roller 212 that can be independently controlled. The rolling position and rolling posture of the two are adjustable. As shown in the figure, the rolling thickness can be controlled by controlling the extension amount of the left tread roller 211 and the right tread roller 212 to the forming drum 1. The area where the left tread roller 211 and the right tread roller 212 roll the tread can be controlled by the axial position of the left tread roller 211 and the right tread roller 212 along the axial direction of the forming drum 1. At the same time, the inclination angle of the left tread roller 211 and the right tread roller 212 in the AA section can be controlled to ensure that the left tread roller 211 and the right tread roller 212 continue to contact the tread in an almost facing manner when the rolling area is adjusted. The dotted line in the figure shows a situation under different positions and postures of the left tread roller 211 and the right tread roller 212.

[0024] Figure 3 for Figure 1Schematic cross-sectional view in the middle BB direction. The auxiliary tread roller set 22 includes a tread shaping roller 221 for shaping the blank at the crown of the tread and a shoulder shaping roller 222 for shaping the blank at the shoulder of the tread. Obviously, there can be two shoulder shaping rollers 222, which belong to both sides of the tread shaping roller 221 and correspond to the shoulders on both sides. The tread shaping roller 221 and the shoulder shaping roller 222 preferably have a circumferential section that matches the expected tread shape. The position and posture of the tread shaping roller 221 and the shoulder shaping roller 222 should be controllably adjustable in order to adapt to the blank to be rolled. Preferably, it is only necessary to ensure that the auxiliary tread roller set 22 can be controlled to extend and retract facing the drum surface of the forming drum 1. In other words, the degree of contact between the tread shaping roller 221 and the shoulder shaping roller 222 and the blank on the forming drum 1 is directly controlled by the extension and retraction of the auxiliary tread roller set 22 to achieve shaping. Preferably, the extension and retraction of the tread shaping roller 221 and the shoulder shaping roller 222 toward the forming drum 1 can be independently controlled to better control the shaping process and achieve a better rolling effect.

[0025] During the rolling process, the green tire is located on the drum surface of the forming drum 1. As the forming drum 1 rotates, the tread portion of the green tire is first rolled by the tread roller set 21, and then shaped and finely pressed by the auxiliary tread roller set 22. This is conducive to obtaining a green tire with uniform rubber flow and accurate tread thickness.

[0026] Preferably, Figure 4 As shown, in order to completely roll-form the green tire on the forming drum 1, the rolling device 2 also includes a sidewall roller group 23. The sidewall roller group 23 includes two sidewall rollers 231 belonging to both sides of the tread of the forming drum 1. Any sidewall roller 231 is used for rolling and shaping the sidewall on the same side. The position and posture of the sidewall roller 231 on the rolling device 2 are adjustable, so that the specific position and rolling depth of the sidewall are continuously changed during rolling. Generally speaking, the tread roller group 21, the auxiliary tread roller group 22 and the sidewall roller group 23 are arranged in layers, and the sidewall roller group 23 is arranged between the tread roller group 21 and the auxiliary tread roller group 22. At this time, the green tire on the forming drum 1 is rolled by the tread roller group 21, and then the sidewall is rolled by the auxiliary tread roller group 22, and finally the tread is shaped by the sidewall roller group 23. This helps to ensure that the rubber material of the tire blank flows in an expected manner and accurately control the thickness of the rubber material after flowing according to a preset cross-sectional thickness, thereby ensuring the molding quality of the tire blank.

[0027] Based on the above-mentioned green tire rolling machine, we provide the following rolling forming method, in which the left tread roller 211 of the tread roller group 21 rolls and advances from the crown on the green tire tread to the shoulders on both sides respectively. At the initial stage of rolling, when the left tread roller 211 is still in the crown position, the tread shaping roller 221 in the auxiliary tread roller group 22 first contacts the green tire tread on the forming drum 1, and gradually shapes and finalizes the tread after rolling by the left tread roller 211 and the right tread roller 212. When the left tread roller 211 and the right tread roller 212 are respectively advanced to the shoulder positions on both sides of the tread, the tread shaping roller 221 of the auxiliary tread roller group 22 extends out and rolls the shoulders of the green tire on the forming drum 1, so that the rubber at the shoulders is shaped. Preferably, the tread shaping roller 221 can keep rolling on the tread at this time. Specifically, the above method includes the following steps:

[0028] S1. Rolling the tire crown. The left tread roller 211 and the right tread roller 212 are both rolled and pushed from the center of the tread to their respective tread shoulders, so that the tread crown is rolled and shaped; at the same time, the tread shaping roller 221 is extended and rolled against the tire crown of the green tire under the action of the set roller pressure, so that the rubber material at the tire crown after being rolled by the left tread roller 211 and the right tread roller 212 is further shaped. Under the rotation of the forming drum 1, the tire crown of the green tire on the forming drum 1 is gradually rolled and shaped.

[0029] S3, rolling the tire shoulder. The left tread roller 211 and the right tread roller 212 continue to advance along the tread to their respective tread shoulders. When advancing to the tread shoulder position, the shoulder shaping roller 222 extends and presses against the tread shoulder with a preset pressure, so that the rubber material at the crown is rolled and well shaped after being rolled by the left tread roller 211 and the right tread roller 212. In this process, preferably, the tread shaping roller 221 is still pressed against the crown of the tread to maintain the shape of the crown and prevent it from being distorted.

[0030] The above content is only a description of the preferred implementation mode of the utility model, and does not limit the scope of the utility model. Without departing from the design spirit of the utility model, various modifications and improvements made to the technical solution of the utility model by ordinary technicians in this field should fall within the protection scope determined by the claims of the utility model.

Claims

1. A tire rolling machine, comprising a forming drum (1) and a rolling device (2), characterized in that: The rolling device (2) comprises at least a tread roller set (21) for rolling the tread of a green tire and an auxiliary tread roller set (22) for assisting in rolling and molding the tread of the green tire; The tread roller group (21) and the auxiliary tread roller group (22) are distributed along the circumference of the forming drum (1); The tread roller group (21) comprises a left tread roller (211) and a right tread roller (212), and the rolling positions and rolling postures of the two rollers can be controlled and adjusted; during rolling, the left tread roller (211) and the right tread roller (212) are respectively pushed from the center of the tread to the shoulder on one side of each tread; The auxiliary tread roller group (22) comprises a tread shaping roller (221) for shaping the blank at the crown of the tread and a shoulder shaping roller (222) for shaping the blank at the shoulder of the tread. The shoulder shaping rollers (222) are divided into two groups, belonging to the two sides of the tread shaping roller (221) and corresponding to the two side shoulders.

2. The tire rolling machine according to claim 1, characterized in that: The tread shaping roller (221) and the shoulder shaping roller (222) have a circumferential section matching the expected tread shape.

3. The tire rolling machine according to claim 1, characterized in that: The positions and postures of the tread shaping roller (221) and the shoulder shaping roller (222) can be controlled and adjusted during rolling.

4. The tire rolling machine according to claim 1, characterized in that: The tread shaping roller (221) and the shoulder shaping roller (222) can both be telescopically adjusted along the tread direction pointing toward the tire blank.

5. The green tire rolling machine according to claim 1, characterized in that: The rolling device (2) further comprises a sidewall roller group (23), wherein the sidewall roller group (23) comprises two sidewall rollers (231) respectively belonging to the two sides of the tread of the forming drum (1), and any one of the sidewall rollers (231) is used for rolling and shaping the sidewall on the same side.

6. The tire rolling machine according to claim 5, characterized in that: The tread roller group (21), the sidewall roller group (23), and the auxiliary tread roller group (22) are sequentially arranged in layers along the circumference of the forming drum (1).

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