Production process of continuously-curled composite cushion rubber for truck tire

Abstract

The invention discloses a production process of a continuously curled composite cushion rubber for a truck tire, which comprises the following steps: step 1, pre-laminating the composite cushion rubber, pressing the composite cushion rubber into an integrated structure through a three-composite extrusion process, cooling and automatically curling into a roll; 2, the whole roll of composite cushion rubber is placed on a feeding frame, cutting is carried out according to the set cutting length of the perimeter of the belt drum, the cut composite cushion rubber is automatically centered and attached to the belt drum, and auxiliary centering confirmation is carried out through the center line of the composite cushion rubber isolation rubber sheet; and step 3, transferring the laminated composite cushion rubber, the belt ply and the tread part to a tire body laminating drum through a transfer ring, inflating and expanding a half part laminated on the tire body drum to the diameter of the cushion rubber, reversely packaging, finishing shaping, and rolling. The problems of complex design process and redundant production flow of the cushion rubber caused by the fact that the sectional area change in the forming process needs to be considered in the existing cushion rubber are solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of tires, and particularly relates to a production process of continuous crimping composite cushion rubber for heavy-duty tires. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] In the traditional design and process of tire production, the manufacturing and fitting of cushion rubber is a complex and high-precision process. The technical core lies in determining the final structure by calculating the length and cross-sectional area of the cushion rubber before it is inflated. First, the left and right cushion rubbers are respectively extruded by an extruder and cut for standby; then, in the molding process, the operator needs to manually position and fit the left and right cushion rubbers to the cursor on the tire body fitting drum. To enhance the stability of the combination of the cushion rubber and the tire body cord, a key isolation rubber sheet is designed as a transition component between the two. After the isolation rubber sheet is pre-fitted with the tire body cord by automatic equipment, the tire body is inflated to support the cushion rubber, and then combined with the belt layer.

[0004] However, the size design method of the cushion rubber in the prior art is quite complex. Since the cross-sectional area change caused by inflation during the molding process must be considered, the theoretical area in the tire material distribution map cannot be directly used, resulting in difficulty and complexity in design. Secondly, from the pre-fitting of the isolation rubber sheet, to the separate extrusion, cutting, and fitting of the left and right cushion rubbers, there are many links, and the entire production process is redundant, resulting in low production efficiency. SUMMARY

[0005] To solve the above problems, the present application provides a production process of continuous crimping composite cushion rubber for heavy-duty tires, which solves the problem of complex cushion rubber design process and redundant production process caused by considering the cross-sectional area change during the molding process.

[0006] To achieve the above purpose, the present application is realized by the following technical solutions: The present application provides a production process of continuous crimping composite cushion rubber for heavy-duty tires, comprising the following steps: Step one: pre-fitting the composite cushion rubber, and pressing the composite cushion rubber into an integrated structure by a three-composite extrusion process, and automatically crimping into a roll after cooling; Step two: placing the entire roll of composite cushion rubber on a feeding rack, cutting according to the cutting length set according to the circumference of the belt drum, and automatically centering and fitting the composite cushion rubber on the belt drum after cutting, and assisting in confirming the centering by the center line of the composite cushion rubber isolation rubber sheet; Step three: the completed composite pad glue and the belt layer and the tread part are transmitted to the tire body through the transmission ring, the half part on the tire body drum is inflated to the pad glue diameter, and the tire body is completed after the reverse package and shaping and rolling.

[0007] As a further implementation, the composite pad glue in step one includes left pad glue, right pad glue and isolation glue sheet, and the left pad glue and the right pad glue are arranged symmetrically on both sides of the isolation glue sheet.

[0008] As a further implementation, the cross section of the left pad glue and the right pad glue is in an inverted trapezoidal structure, and the cross section area is set according to the actual area of the pad glue in the tire design material distribution.

[0009] As a further implementation, the isolation glue sheet is in a long strip sheet structure, and the thickness is in the range of 0.8-1.2mm, and a center line is pressed on the center of the isolation glue sheet along the length direction, so as to facilitate the centering during the bonding.

[0010] As a further implementation, the size of the pad glue before inflation is not considered during the processing of the composite pad glue in step one, so that the isolation glue sheet can be cut and pre-pressed according to the uniform size, and the composite pad glue is convenient for processing and storage.

[0011] As a further implementation, the composite pad glue is wound by the I-beam after cooling in step one, and an isolation film is laid on the side of the isolation glue sheet away from the left pad glue and the right pad glue before the storage and winding, and the isolation film is removed before bonding.

[0012] As a further implementation, a cutting knife is arranged on the feeding frame in step two, and the composite pad glue is cut by adjusting the position of the cutting knife, so that the size of the composite pad glue can adapt to the size of the belt drum.

[0013] As a further implementation, the center line of the isolation glue sheet is aligned with the center of the bonding equipment or the tire body during the automatic centering bonding of the composite pad glue in step two, and manual correction is required if deviation occurs.

[0014] As a further implementation, in step three, during the inflation process, it is necessary to ensure that the tire body is in complete contact with the composite pad glue.

[0015] As a further implementation, in step three, when the tire body after shaping is rolled, the specific pressure value required by the rolling equipment is set according to the actual pressure requirement, and the tread is rolled by the specific pressure to discharge the air between the composite pad glue and the belt layer and the tire body.

[0016] Compared with the prior art, the present application has the advantages and positive effects that: The present application avoids the change of cross-sectional area caused by the stretching and expansion of the cushion gum after the tire blank is inflated, which is considered when the size and volume of the cushion gum are designed in the traditional technical method, and the cushion gum area in the tire material distribution map cannot be directly used, and the size of the composite cushion gum is increased, so that the composite cushion gum cannot be rolled and stored, and the processing efficiency is low; the pre-laminating process of the isolation rubber sheet and the tire body, the left cushion gum laminating process and the right cushion gum laminating process are simplified to one process of composite cushion gum laminating, which improves the production efficiency; the whole roll of composite cushion gum is placed on the feeding rack, and the cutting length is set according to the circumference of the belt drum; after cutting, the composite cushion gum will be automatically centered and laminated on the belt drum, and the center line of the composite cushion gum isolation rubber sheet is used for auxiliary confirmation of centering; since the composite cushion gum is an integral structure that cannot be separated, the positioning error caused by manual positioning at the beginning of lamination is reduced, and the lamination precision and efficiency are improved; the composite cushion gum, the belt layer and the tread part after lamination are transferred to the tire body lamination drum through the transfer ring, the half part laminated on the tire body drum is inflated to the diameter of the composite cushion gum, so that the composite cushion gum can be completely in contact with the tire body, and after the reverse wrapping, the shaping and rolling are completed, the air between the composite cushion gum and the belt layer and the tire body is completely discharged through rolling, so that the lamination between the composite cushion gum and the belt layer and the tire body is more closely.

[0017] The present application is a pre-assembled stable whole by setting the left and right cushion gums in parallel and symmetrically, and connecting them through the center line of the isolation rubber sheet; when laminated to the tire, the center line on the isolation rubber sheet can be used for quick and accurate centering, effectively avoiding the cumulative error that may be caused by positioning of multiple parts in the traditional process, significantly improving the lamination accuracy and assembly efficiency, and integrating the left and right cushion gums and the isolation layer into a composite part, which simplifies the forming process. The operator only needs to align once, which reduces the operation complexity and skill requirement, and also reduces the risk of defects caused by multiple operations; the left and right cushion gums adopt an inverted trapezoidal cross-section design, which can achieve more ideal matching and transition with the internal profile of the tire; it helps to evenly disperse and buffer the stress borne by the cushion gum area during driving, reduces stress concentration, and thus improves the durability and service life of the tire.

[0018] The present application sets the specific pressure value required by the rolling equipment according to the actual pressure requirement when rolling the shaped carcass, avoids the belt layer cord injury, deformation or fracture caused by excessive pressure, rolls the tread through the specific pressure to discharge the air between the composite pad rubber and the belt layer and the carcass, and the specific pressure value can ensure that the rolling force accurately penetrates the tread composite layer, and the air between the belt layer, the composite pad rubber and the carcass is completely and uniformly discharged. The internal quality defects such as bubbles, delamination and separation caused by residual air are avoided, and the structural integrity and uniformity of the tire are improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings accompanying the specification of the present application serve to provide further understanding of the present application, and the illustrative embodiments of the present application and the description thereof serve to explain the present application, and do not constitute an improper limitation on the present application.

[0020] Fig. 1 It is a schematic diagram of the cross-sectional structure of the composite pad rubber of the present application; Fig. 2 It is a schematic diagram of the composite pad rubber bonding part structure of the present application; Fig. 3 It is a schematic diagram of the composite pad rubber and the belt drum side view structure of the present application.

[0021] In the figure: 1, isolation rubber sheet; 2, left pad rubber; 3, right pad rubber; 4, composite pad rubber; 5, pulley; 6, feeding rack; 7, cutter; 8, belt drum. DETAILED DESCRIPTION

[0022] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0023] It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless otherwise explicitly indicated by the present application, the singular form is also intended to include the plural form, and in addition, it should be understood that when the terms "comprise" and / or "include" are used in the specification, it means that there is a feature, step, operation, device, component and / or combination thereof; Three-compound extrusion process is an advanced extrusion technology, which can extrude three different formulas or different colored rubber through a precise extruder head at the outlet and firmly combine into a whole three-layer composite part with a specific three-dimensional structure.

[0024] Example 1 The embodiment discloses a production process of continuous crimping composite pad rubber for heavy-duty tires, comprising the following steps: Step one: pre-adhere the composite pad rubber 4, press the composite pad rubber 4 into an integrated structure through a three-composite extrusion process, and automatically curl into a roll after cooling; simplify the pre-adhesion process of the isolation rubber sheet 1 and the tire body, the left pad rubber 2 adhesion process, and the right pad rubber 3 adhesion process into one process of composite pad rubber 4 adhesion, thereby improving the production efficiency; Step two: place the whole roll of composite pad rubber 4 on the feeding rack 6, cut according to the cutting length set according to the circumference of the belt drum 8, and after cutting, the composite pad rubber 4 will be automatically centered and adhered to the belt drum 8, and the center line of the isolation rubber sheet 1 of the composite pad rubber 4 is used for auxiliary confirmation of centering; the left and right pad rubbers 3 and the isolation rubber sheet 1 are pre-pressed into an integral structure that cannot be separated through a three-composite extrusion process, the relative positions of the three are fixed, and the centering adhesion of the forming machine reduces the positioning error caused by manual positioning at the beginning of adhesion, thereby improving the pad rubber adhesion precision and adhesion efficiency; Step three: after the adhesion of the composite pad rubber 4 and the belt layer and the tread components is completed, they are transferred to the tire body adhesion drum through the transfer ring, the half components adhered on the tire body drum are inflated to the diameter of the composite pad rubber 4, so that the composite pad rubber 4 can be fully in contact with the tire body, and after the reverse wrapping, the shaping and rolling are completed, the air between the composite pad rubber 4 and the belt layer and the tire body is completely discharged through the rolling, so that the adhesion between the composite pad rubber 4 and the belt layer and the tire body is more closely.

[0025] As a further implementation manner, the composite pad rubber 4 in step one comprises the left pad rubber 2, the right pad rubber 3 and the isolation rubber sheet 1, as shown in Figs. 1-3As shown, the left pad rubber 2 and the right pad rubber 3 are arranged in parallel and symmetrically on both sides of the isolation sheet 1. The cross sections of the left pad rubber 2 and the right pad rubber 3 are all inverted trapezoidal structures, and the cross-sectional areas are set according to the actual area of the pad rubber in the tire design material distribution. The isolation sheet 1 is in a long strip sheet structure, and the thickness is in the range of 0.8-1.2mm. A center line is pressed on the center of the isolation sheet 1 along the length direction, which is convenient for centering during lamination. Through the parallel and symmetric arrangement of the left and right pad rubbers 3, and the connection through the isolation sheet 1 with the center line, a pre-assembled stable whole is formed. When laminated to the tire, the center line on the isolation sheet 1 can be used for quick and accurate centering, effectively avoiding the cumulative error that may be caused by positioning of multiple components in the traditional process, significantly improving the lamination accuracy and assembly efficiency. The left pad rubber 2, the right pad rubber 3 and the isolation layer, which originally need to be laminated separately, are integrated into a composite component, simplifying the molding process. The operator only needs to perform lamination alignment once, reducing the operation complexity and skill requirement, and reducing the risk of defects caused by multi-step operation. The left and right pad rubbers 3 adopt inverted trapezoidal cross-sectional design, which can achieve more ideal matching and transition with the internal profile of the tire. It is helpful to uniformly disperse and buffer the stress borne by the pad rubber area during driving, reduce stress concentration, and thus improve the durability and service life of the tire.

[0026] As a further implementation manner, in step one, the size of the pad rubber before expansion does not need to be considered when processing the composite pad rubber 4. The size design of the pad rubber can directly use the corresponding size in the material distribution diagram, without the need for pre-expansion calculation. The isolation sheet 1 can be cut and pre-pressed according to a unified size, which is convenient for processing and storing the composite pad rubber 4, and realizes the coiled storage of the composite pad rubber 4. Since the size design can be designed according to the size of the tire material distribution diagram, the thickness of the pad rubber is greatly reduced, and the coiling difficulty is also reduced.

[0027] As a further implementation manner, as shown in Figs. 2-3 As shown in step one, after cooling, the composite pad rubber 4 is wound by the spool 5. Before storage and coiling, an isolation film needs to be laid on the side of the isolation sheet 1 away from the left pad rubber 2 and the right pad rubber 3, and the isolation film is removed before lamination. Since the surface of the composite pad rubber 4 is usually sticky or prone to sticking under certain temperature and pressure. After laying the isolation film, the self-sticking between the pad rubber layer and the spool 5, or between the pad rubber layers is avoided, ensuring that the pad rubber interface remains clean and flat without any damage or deformation before subsequent transportation, storage and even final lamination. At the same time, the composite pad rubber 4 roll with isolation film protection can effectively resist performance degradation caused by changes in environmental temperature and humidity during long-term storage, and can also avoid moisture absorption, oxidation or excessive curing of the rubber layer.

[0028] As a further implementation manner, as shown in Figs. 2-3As shown, in step two, a cutter 7 is provided on the feed rack 6. By adjusting the position of the cutter 7, the composite pad 4 is cut so that the size of the composite pad 4 can be adapted to the size of the belt drum 8.

[0029] As a further implementation method, in step two, when the composite pad adhesive 4 is automatically centered and bonded, it is necessary to ensure that the center line of the isolation film 1 is aligned with the center of the bonding equipment or the tire body. If a deviation occurs, the machine needs to be stopped for manual correction.

[0030] As a further implementation method, in step three, during the inflation process, it is necessary to ensure that the tire body is in complete contact with the composite pad rubber 4.

[0031] As a further implementation, in step three, when rolling the shaped tire carcass, a specific pressure value needs to be set on the rolling equipment according to the actual pressure requirements. This avoids damage, deformation, or breakage of the belt layer cords due to excessive pressure. Rolling the tread under specific pressure removes air between the composite gasket 4, the belt layer, and the tire carcass. The specific pressure value ensures that the rolling force accurately penetrates the tread composite layer, thoroughly and evenly removing air from the belt layer, composite gasket 4, and the tire carcass. This avoids internal quality defects such as air bubbles and delamination caused by residual air, improving the structural integrity and uniformity of the tire.

[0032] While specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this does not constitute a limitation on the invention. As should be understood by those skilled in the art, based on the technical solutions of this invention, various modifications or variations that can be made by those skilled in the art without creative effort are still within the scope of protection of this invention.

Claims

1. A production process for a continuously rolled composite gasket for heavy-duty tires, characterized in that, Includes the following steps: Step 1: Pre-apply the composite adhesive, and press the composite adhesive into a single structure through a three-component extrusion process. After cooling, it will automatically be rolled into a roll. Step 2: Place the entire roll of composite padding on the feeding rack, cut it according to the circumference of the belt drum, and after cutting, the composite padding will automatically center and adhere to the belt drum. Use the center line of the composite padding isolation film to help confirm the centering. Step 3: After the composite pad, belt layer, and tread components are bonded together, they are transferred to the tire body bonding drum via the transfer ring. The half-components bonded to the tire body drum are inflated to the diameter of the pad, then reversed and shaped before being rolled.

2. The production process of a continuously rolled composite pad for heavy-duty tires as described in claim 1, characterized in that, The composite padding adhesive mentioned in step one includes a left padding adhesive, a right padding adhesive, and a release film. The left and right padding adhesives are arranged parallel and symmetrically on both sides of the release film.

3. The production process of a continuously rolled composite pad for heavy-duty tires as described in claim 2, characterized in that, Both the left and right rubber pads have inverted trapezoidal cross-sections, and their cross-sectional areas are set according to the actual area of ​​the rubber pads in the tire design material distribution.

4. The production process of a continuously rolled composite pad for heavy-duty tires as described in claim 2, characterized in that, The insulating film has a long, thin sheet structure with a thickness ranging from 0.8 to 1.2 mm. A center line is pressed out along the length of the insulating film to facilitate centering during bonding.

5. The production process of a continuously rolled composite pad for heavy-duty tires as described in claim 2, characterized in that, In step one, when processing the composite gasket, there is no need to consider the size of the gasket before expansion, so that the isolation film can be cut and pre-pressed according to a uniform size, which makes it easy to process and store the composite gasket.

6. The production process of a continuously rolled composite pad for heavy-duty tires as described in claim 2, characterized in that, After cooling in step one, the composite pad is wound up by an I-beam. Before winding it up, a release film needs to be laid on the side of the release film away from the left and right pads. The release film is removed before bonding.

7. The production process of a continuously rolled composite gasket for heavy-duty tires as described in claim 1, characterized in that, In step two, a cutter is installed on the feeding rack. By adjusting the position of the cutter, the composite pad is cut so that the size of the composite pad can be adapted to the size of the belt drum.

8. The production process of a continuously rolled composite gasket for heavy-duty tires as described in claim 7, characterized in that, In step two, when the composite pad is automatically aligned and bonded, the center line of the release liner must be aligned with the center of the bonding equipment or the tire body. If any deviation occurs, the machine must be stopped for manual correction.

9. The production process of a continuously rolled composite gasket for heavy-duty tires as described in claim 1, characterized in that, In step three, during the inflation process, it is necessary to ensure that the tire body is in complete contact with the composite pad rubber.

10. The production process of a continuously rolled composite pad for heavy-duty tires as described in claim 1, characterized in that, In step three, when rolling the shaped tire carcass, the roller pressing equipment needs to be set to the required specific pressure value according to the actual pressure requirements. The tire tread is rolled under the specific pressure to expel the air between the composite pad rubber, belt layer, and tire carcass.

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