A kind of edge covering device and belt cover structure for radial tire production

Abstract

The application discloses a covering device for radial tire production and a belt covering structure, relates to the field of tire production technology, and discloses a covering device for radial tire production, which comprises a mounting rack, the mounting rack is provided with a conveying belt for conveying a belt ply, two extruders for extruding a covering rubber strip and two profiling mechanisms for extruding and covering the covering rubber strip to the edges of the belt ply; the two profiling mechanisms are correspondingly arranged with the two extruders, and the two profiling mechanisms are oppositely arranged on the two sides of the conveying belt; the profiling mechanism comprises an upper profiling roller and a lower profiling roller, the upper profiling roller and the lower profiling roller are used for jointly rolling the covering rubber strip, a profiling angle is formed between the upper profiling roller and the lower profiling roller, and the upper profiling roller is provided with a pressing flange close to one end of the conveying belt; the pressing flange is used for extruding the covering rubber strip to form an extension edge at the edge part of the upper surface of the belt ply. The application can improve the covering efficiency and quality of the belt.

Description

Technical Field

[0001] This application relates to the field of tire manufacturing technology, and in particular to a binding device and belt layer binding structure for radial tire production. Background Technology

[0002] Tires can be classified into angled tires and radial tires based on the direction of the tire cord arrangement. In tire manufacturing, a belt layer fabric cutting machine is usually used to cut the belt layer fabric into parallelogram-shaped belt layer fabric strips according to the width and angle requirements set by the process. Then, the cut belt layer fabric strips are automatically spliced ​​in sequence, and finally, the two sides are hemmed.

[0003] In the edge-wrapping process, the edge-wrapping film is pre-made and wound into a roll. Then, the film is unwound and applied to the edge at a speed matching that of the belt layer fabric. Finally, a winding device rolls the edge-wrapped belt layer fabric into the required roll for use in the next process. Due to the poor flexibility and extensibility of the film, the density of the bond in the belt layer after edge wrapping is poor, which has a significant impact on tire quality. Summary of the Invention

[0004] To address the issue of poor quality in the belt layer of radial tires when using rubber edging, this application provides an edging device and a belt layer edging structure for radial tire production.

[0005] The technical solution provided in this application for a binding device and belt layer binding structure for radial tire production adopts the following:

[0006] A binding device for radial tire production includes a mounting frame, which is equipped with a conveyor belt for conveying belt layer fabric, two extruders for extruding binding strips, and two forming mechanisms for extruding the binding strips to the edge of the belt layer fabric. The two forming mechanisms are respectively positioned corresponding to the two extruders and are located opposite each other on both sides of the conveyor belt. Each forming mechanism includes an upper forming roller and a lower forming roller, which together press the binding strip. A forming angle is formed between the upper and lower forming rollers. The upper forming roller has a pressing flange near one end of the conveyor belt. The outer peripheral surface of the pressing flange is conical, and the angle between the outer peripheral surface of the pressing flange and the outer peripheral surface of the main body of the upper forming roller faces inward towards the forming angle. The pressing flange is used to press the binding strip onto the edge of the upper surface of the belt layer fabric to form an extended edge.

[0007] By adopting the above technical solution, the extruder continuously extrudes the edge-sealing strip. Without cooling, the edge-sealing strip is directly wrapped around the side edge of the belt layer fabric under the extrusion action of the forming mechanism, forming the edge. This improves the edge-sealing efficiency of the belt layer fabric. Furthermore, the edge-sealing strip is applied to the edge of the belt layer fabric using a hot-adhesive method, reducing the likelihood of air bubbles or bulges, thus improving the density of the edge-sealing and ensuring its quality. During the process of the upper and lower forming rollers of the forming mechanism jointly pressing the edge-sealing strip, the pressing flange of the upper forming roller forms an extended edge on the upper surface of the belt layer fabric. This extended edge increases the bonding area between the edge-sealing strip and the belt layer fabric, ensuring a reliable connection between them.

[0008] Optionally, the conical surface of the pressing flange is provided with a plurality of pressing protrusions.

[0009] By adopting the above technical solution, the pressure protrusions located on the flattening flange can successively squeeze the forming extension edge during the rotation of the upper forming roller. Under the action of the pressure protrusions, the adhesion between the extension edge and the belt layer fabric can be improved.

[0010] Optionally, the lower pressing roller has a first limiting flange at the end away from the conveyor belt, and the upper pressing roller has a second limiting flange at the end away from the conveyor belt. The first limiting flange and the second limiting flange are arranged vertically and vertically, and the outer peripheral surface of the first limiting flange abuts against the outer peripheral surface of the second limiting flange.

[0011] By adopting the above technical solution, during the extrusion process of the edge-sealing rubber strip in the forming corner area of ​​the forming mechanism, the rubber material of the edge-sealing rubber strip mainly flows towards the direction of the belt layer fabric. However, when the rubber material of the edge-sealing rubber strip is obstructed by the edge of the belt layer fabric, it will flow towards the inside of the forming corner. When the rubber material of the edge-sealing rubber strip flows towards the inside of the forming rubber along the surface of the upper forming roller and the lower forming roller, the first limiting flange and the second limiting flange can obstruct the flow of the rubber material of the edge-sealing rubber strip, thereby reducing the overflow of the rubber material of the edge-sealing rubber strip from the forming corner area.

[0012] Optionally, the mounting frame is provided with a pressing roller mechanism, which is located between the two forming mechanisms. The pressing roller mechanism includes an upper pressing roller and a lower pressing roller, and is used to press the portion of the belt layer fabric close to the forming mechanism.

[0013] By adopting the above technical solution, the upper and lower pressing rollers of the pressing roller mechanism can press the part of the belt layer fabric close to the pressing mechanism, so that the part of the belt layer fabric that is about to be covered by the edge binding strip by the pressing mechanism remains stable, thereby helping the edge binding strip to reliably adhere to the edge of the belt layer under the action of the pressing mechanism.

[0014] Optionally, the pressing roller mechanism is used for rolling the belt layer fabric across the entire width range. Two pressing roller mechanisms are provided, defined as a first pressing roller mechanism and a second pressing roller mechanism, respectively. The first pressing roller mechanism and the second pressing roller mechanism are arranged side by side along the conveying direction of the conveyor belt. The rolling speed of the first pressing roller mechanism is the same as the conveying speed of the conveyor belt, and the rolling speed of the first pressing roller mechanism is less than that of the second pressing roller mechanism. When the conveyor belt is running, it passes through the first pressing roller mechanism, the forming mechanism, and the second pressing roller mechanism in sequence.

[0015] By adopting the above technical solution, the conveyor belt passes through the first pressing roller mechanism, the forming mechanism, and the second pressing roller mechanism in sequence during operation. That is, the part of the edge-binding strip that is edge-bound by the forming mechanism is located between the first pressing roller mechanism and the second pressing roller mechanism. Since there is a speed difference between the first pressing roller mechanism and the second pressing roller mechanism, and the second pressing roller mechanism that rolls the belt layer fabric at a higher speed, the part of the belt layer fabric located between the first pressing roller mechanism and the second pressing roller mechanism can be kept taut. Furthermore, since the pressing roller mechanism can roll the belt layer fabric across the entire width, it helps to keep the part of the belt layer fabric to be edge-bound as stiff and flat as possible, thereby ensuring the quality of the edge binding.

[0016] Optionally, the upper pressing roller of the first pressing roller mechanism is provided with guide flanges at both ends, and the two guide flanges are respectively used to abut against the two side edges of the belt layer fabric.

[0017] By adopting the above technical solution, the guide flanges at both ends of the upper pressing roller of the first pressing roller mechanism can guide the formation of the belt layer fabric, so that the positional relationship between the belt layer fabric and the conveyor belt in the width direction remains stable, and the position between the belt layer fabric and the forming mechanism also remains stable.

[0018] Optionally, the end faces of the two guide flanges at their opposite ends are respectively provided with limiting protrusions. The diameter of the limiting protrusions is smaller than the diameter of the guide flanges, and the two limiting protrusions are respectively used to abut against the edge of the rubber body of the belt layer fabric.

[0019] By adopting the above technical solution, the guide flange is used to abut the exposed ends of the cords at the edge of the belt layer fabric, and the limiting protrusion is used to abut the rubber body of the belt layer fabric, so that the belt layer fabric is subjected to a dual guiding effect during the conveying process.

[0020] Optionally, the mounting frame is provided with an auxiliary pressing mechanism, which includes a driving pulley, a driven pulley, and a transmission belt. The axes of the driving pulley and the driven pulley are arranged vertically. The transmission belt is wound around and connected to the driving pulley and the driven pulley respectively. The transmission belt is provided with grooves along its entire length, and the grooves are used to avoid the edge binding strip covering the belt layer fabric.

[0021] By adopting the above technical solution, after the pressing mechanism squeezes the edge-binding strip to cover the edge of the belt layer fabric, the drive belt of the auxiliary pressing mechanism can apply a force along the width direction of the newly formed edge-binding area. In other words, the auxiliary pressing mechanism can maintain pressure on the newly formed edge-binding, which helps ensure the stability of the connection between the edge-binding and the belt layer fabric. The grooves of the drive belt can avoid the edge-binding, making the interaction force between the edge-binding and the drive belt as parallel as possible to the width direction of the belt layer fabric.

[0022] A belt layer edge-wrapping structure is formed by any of the above-mentioned edge-wrapping devices used in radial tire production. The belt layer edge-wrapping structure includes an edge-wrapping body and an extension edge. The cross-section of the edge-wrapping body is a right-angled triangle. The extension edge is located on one of the acute angle sides of the edge-wrapping body. The extension edge is pressed and bonded to the upper surface of the belt layer fabric by a pressing flange.

[0023] By adopting the above technical solution, the edging body of the belt layer's edging structure is glued to the edge of the belt layer's curtain section. The exposed ends of the cords after the belt layer's curtain edge is cut are wrapped inside the edging body, achieving the purpose of edging the belt layer's curtain. In addition to bonding the edging body to the edge of the belt layer's curtain, the edging structure also bonds the extended edge to the upper surface of the belt layer's edge, ensuring a reliable connection between the edging structure and the belt layer's curtain.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. The extruder continuously extrudes the edge-sealing strip. Without cooling, the strip is directly applied to the side edge of the belt layer fabric under the pressure of the forming mechanism, forming the edge. This improves the edge-sealing efficiency of the belt layer fabric. Furthermore, the edge-sealing strip is applied to the edge of the belt layer fabric using a hot-adhesive method, reducing the likelihood of air bubbles forming and improving the density of the edge-sealing, thus ensuring quality. During the joint pressing of the edge-sealing strip by the upper and lower forming rollers of the forming mechanism, the pressing flange of the upper roller forms an extended edge on the upper surface of the belt layer fabric. This extended edge increases the bonding area between the edge-sealing strip and the belt layer fabric, ensuring a reliable connection between them.

[0026] 2. After the pressing mechanism squeezes the edge-binding strip to cover the edge of the belt layer fabric, the drive belt of the auxiliary pressing mechanism applies a force along the width direction of the newly formed edge-binding area. This means the auxiliary pressing mechanism maintains pressure on the newly formed edge, ensuring the stability of the connection between the edge-binding and the belt layer fabric. The grooves of the drive belt avoid the edge-binding, ensuring that the interaction force between the edge-binding and the drive belt is as parallel as possible to the width direction of the belt layer fabric. Attached Figure Description

[0027] Figure 1 This is a top view of the edging device of Embodiment 1.

[0028] Figure 2 This is a schematic diagram of Example 1 illustrating the positional relationship between the forming mechanism and the belt layer fabric.

[0029] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0030] Figure 4 Example 1 is a schematic diagram illustrating the positional relationship between the first pressing roller mechanism and the belt layer fabric.

[0031] Figure 5 This is a schematic diagram of Example 1 illustrating the connection between the transmission belt and the edge binding strip.

[0032] Figure 6 This is a schematic diagram of the forming mechanism in Example 2.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Mounting frame; 2. Conveyor belt; 3. Extruder; 4. Forming mechanism; 41. Upper forming roller; 411. Second limiting flange; 42. Lower forming roller; 421. First limiting flange; 43. Forming angle; 44. Edge pressing flange; 5. Guide wheel; 6. Pressing roller mechanism; 601. First pressing roller mechanism; 602. Second pressing roller mechanism; 61. Upper pressing roller; 611. Guide flange; 612. Limiting protrusion; 62. Lower pressing roller; 7. Auxiliary edge pressing mechanism; 71. Drive pulley; 72. Driven pulley; 73. Transmission belt; 731. Groove; 8. Belt layer fabric; 9. Edge binding strip; 91. Edge binding body; 92. Extension edge. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0036] Example 1

[0037] This application discloses a hemming device and a belt layer hemming structure for radial tire production. (Refer to...) Figure 1 The edge-wrapping device for radial tire production includes a mounting frame 1. The mounting frame 1 is equipped with a conveyor belt 2 for conveying the belt layer fabric 8, two extruders 3 for extruding edge-wrapping rubber strips 9, and two forming mechanisms 4 for extruding and wrapping the edge-wrapping rubber strips 9 to the edge of the belt layer fabric 8. The extrusion nozzle of the extruder 3 is a round nozzle. The two forming mechanisms 4 are respectively arranged corresponding to the two extruders 3 and are respectively arranged opposite to each other on both sides of the conveyor belt 2.

[0038] When the edge-wrapping device is working, the conveyor belt 2 continuously transports the cut and re-spliced ​​belt layer fabric 8. The extruders 3 located on both sides of the conveyor belt 2 continuously extrude edge-wrapping strips 9. When the belt layer fabric 8 passes through the two forming mechanisms 4, the two forming mechanisms 4 continuously squeeze and cover the still-cooled edge-wrapping strips 9 to both sides of the belt layer fabric 8, realizing the edge-wrapping process of the belt layer fabric 8. The edge-wrapped belt layer fabric 8 is then wound up using a winding device.

[0039] Reference Figure 2 and Figure 3 The forming mechanism 4 includes an upper forming roller 41 and a lower forming roller 42. The upper forming roller 41 and the lower forming roller 42 are used to jointly roll the edge binding strip 9. The axis of the lower forming roller 42 is set horizontally, while the axis of the upper forming roller 41 is set inclined. The upper forming roller 41 gradually tilts upward along the direction close to the conveyor belt 2, forming a forming angle 43 between the upper forming roller 41 and the lower forming roller 42. The lower edge of the forming angle 43 is flush with or slightly lower than the working surface of the conveyor belt 2, and the upper edge of the forming angle 43 extends upward beyond the edge of the belt layer fabric 8. At least one of the upper forming roller 41 and the lower forming roller 42 is a driving roller. In this embodiment, the lower forming roller 42 is set as the driving roller. In other embodiments, both the upper forming roller 41 and the lower forming roller 42 can be set as driving rollers.

[0040] As the belt layer fabric 8 passes through the forming angle 43, the extruder 3 continuously extrudes the edge-sealing rubber strip 9 with a circular cross section. The upper forming roller 41 and the lower forming roller jointly roll the edge-sealing rubber strip 9, causing the rubber material box of the edge-sealing rubber strip 9, which has not yet cooled, to be shaped and flow in the direction close to the belt layer fabric 8, so that the edge-sealing rubber strip 9 covers the edge of the belt layer fabric.

[0041] Reference Figure 1 The mounting frame 1 is equipped with two sets of guide wheels 5, which are respectively set on both sides of the conveyor belt 2. Each set of guide wheels 5 has multiple guide wheels. The multiple guide wheels 5 in the same set are located between the extruder 3 and the forming mechanism 4 on the same side. The edge-binding rubber strip 9 extruded by the extruder 3 passes through the multiple guide wheels 5 in the same set in sequence and then enters the forming angle 43 area of ​​the forming mechanism 4.

[0042] Reference Figure 3 The upper forming roller 41 is provided with a pressing flange 44 near the conveyor belt 2. The outer peripheral surface of the pressing flange 44 is a conical surface. The included angle between the outer peripheral surface of the pressing flange 44 and the outer peripheral surface of the main body of the upper forming roller 41 is towards the inside of the forming angle 43. When the rubber material of the edge binding strip 9 located inside the forming angle 43 flows outward to be shaped, the pressing flange 44 can squeeze the edge binding strip 9 at the edge of the upper surface of the belt layer fabric 8 to form an extension edge 92. The extension edge 92 can increase the connection between the edge binding strip 9 and the belt layer fabric 8.

[0043] The conical surface of the pressing flange 44 is provided with pressure protrusions. The number of pressure protrusions is set to one or more. When the pressing flange 44 squeezes the edge binding strip 9 to form the extended edge 92, the pressure protrusions successively press and squeeze the extended edge 92 to enhance the adhesion of the extended edge 92 to the belt layer fabric 8.

[0044] Reference Figure 3 The lower pressing roller 42 is provided with a first limiting flange 421 at the end away from the conveyor belt 2, and the upper pressing roller 41 is provided with a second limiting flange 411 at the end away from the conveyor belt 2. The first limiting flange 421 and the second limiting flange 411 are arranged vertically and vertically, and the outer peripheral surface of the first limiting flange 421 abuts against the outer peripheral surface of the second limiting flange 411.

[0045] A stepped surface is formed between the first limiting flange 421 and the outer peripheral surface of the lower pressing roller 42, and a stepped surface is formed between the second limiting flange 411 and the outer peripheral surface of the upper pressing roller 41. When the pressing mechanism 4 presses the edge binding strip 9 toward the belt layer fabric 8, the edge of the belt layer fabric can exert a reverse force on the edge binding strip 9, causing the adhesive material of the edge binding strip 9 to flow in the opposite direction along the surfaces of the upper pressing roller 41 and the lower pressing roller 42. By setting the first limiting flange 421 and the second limiting flange 411, the overflow of the adhesive material of the edge binding strip 9 away from the opening of the pressing angle 43 can be reduced.

[0046] Reference Figure 1 and Figure 4 The mounting frame 1 is also equipped with a pressing roller mechanism 6, which is located between the two forming mechanisms 4. The pressing roller mechanism 6 includes an upper pressing roller 61 and a lower pressing roller 62, wherein the upper pressing roller 61 is the driving roller. The pressing roller mechanism 6 is used to press the portion of the belt layer fabric 8 near the forming mechanism 4; in this embodiment, more precisely, the pressing roller mechanism 6 is used to press the portion of the belt layer fabric 8 near the forming mechanism 4. The lengths of both the upper pressing roller 61 and the lower pressing roller 62 of the pressing roller mechanism 6 are greater than the width of the belt layer fabric, and the pressing roller mechanism 6 can press the belt layer fabric 8 across its full width.

[0047] Reference Figure 1There are two pressing roller mechanisms 6, which are defined as the first pressing roller mechanism 601 and the second pressing roller mechanism 602 respectively. The first pressing roller mechanism 601 and the second pressing roller mechanism 602 are arranged side by side along the conveying direction of the conveyor belt 2. The pressing speed of the first pressing roller mechanism 601 is the same as the conveying speed of the conveyor belt 2, and the pressing speed of the first pressing roller mechanism 601 is less than the pressing speed of the second pressing roller mechanism 602. When the conveyor belt 2 is running, it passes through the first pressing roller mechanism 601, the forming mechanism 4 and the second pressing roller mechanism 602 in sequence.

[0048] The conveyor belt 2 drives the belt layer fabric 8 through the first pressing roller mechanism 601, the forming mechanism 4, and the second pressing roller mechanism 602 in sequence. The forming mechanism 4 squeezes and covers the edge binding strip 9 onto the portion of the belt layer fabric 8 located between the first pressing roller mechanism 601 and the second pressing roller mechanism 602. Due to the speed difference between the first pressing roller mechanism 601 and the second pressing roller mechanism 602, and the larger rolling speed of the second pressing roller mechanism 602 that rolls the belt layer fabric 8, the portion of the belt layer fabric 8 located between the first pressing roller mechanism 601 and the second pressing roller mechanism 602 can maintain tension. Furthermore, since the pressing roller mechanism 602 can roll the belt layer fabric 8 across its full width, it helps to keep the area of ​​the belt layer fabric 8 to be edged stiff and flat across its entire width, thus ensuring the quality of the edge binding.

[0049] Reference Figure 4 The upper pressing roller 61 of the first pressing roller mechanism 601 has guide flanges 611 at both ends, which are used to abut against the two side edges of the belt layer fabric 8. The end faces of the opposite ends of the two guide flanges 611 are provided with limiting protrusions 612, the diameter of which is smaller than that of the guide flanges 611. The two limiting protrusions 612 are used to abut against the edges of the rubber body of the belt layer fabric 8.

[0050] The guide flange 611 is used to abut against the exposed ends of the cords at the edge of the belt layer fabric 8, and the limiting protrusion 612 is used to abut against the rubber body of the belt layer fabric 8, so that the belt layer fabric 8 is subjected to a double guiding effect during the conveying process, and the relative position between the belt layer fabric 8 and the conveyor belt 2 in the width direction remains stable.

[0051] Reference Figure 1 and Figure 5 The mounting frame 1 is equipped with an auxiliary pressing mechanism 7, which includes a driving pulley 71, a driven pulley 72 and a transmission belt 73. The axes of the driving pulley 71 and the driven pulley 72 are arranged vertically. The transmission belt 73 is wound around and connected to the driving pulley 71 and the driven pulley 72 respectively. The transmission belt 73 is provided with a groove 731 along its entire length. The groove 731 is used to avoid the edge binding strip 9 covering the belt layer fabric 8.

[0052] The drive belt 73 of the auxiliary pressing mechanism 7 applies a pushing force to the belt layer fabric 8 through the groove 731, thereby making the drive belt 73 exert a pressure-holding effect on the newly formed edge on the belt layer fabric 8, which is conducive to making the newly formed edge firmly bonded.

[0053] The pressing roller mechanism 6 can press the part of the belt layer fabric 8 that passes through the forming mechanism 4. When the forming mechanism 4 squeezes the edge binding strip 9 to cover the belt layer fabric 8, the position of the belt layer fabric 8 can remain stable.

[0054] The implementation principle of the edge-wrapping device for radial tire production in this application embodiment is as follows: the extruder 3 continuously extrudes the edge-wrapping rubber strip 9. The edge-wrapping rubber strip 9, without cooling, is directly wrapped around the side edge of the belt layer fabric 8 under the extrusion action of the forming mechanism 4 to form an edge. This improves the edge-wrapping efficiency of the belt layer fabric 8. Furthermore, the edge-wrapping rubber strip 9 is applied to the edge of the belt layer fabric using a hot-adhesive method, which improves the density of the edge wrapping and thus ensures the quality of the edge wrapping. During the process of the upper forming roller 41 and the lower forming roller 42 of the forming mechanism 4 jointly pressing the edge-wrapping rubber strip 9, the pressing flange 44 of the upper forming roller 41 can form an extended edge 92 on the upper surface of the belt layer fabric 8. The extended edge 92 of the edge-wrapping rubber strip 9 can increase the bonding area between the edge-wrapping rubber strip 9 and the belt layer fabric 8, ensuring a reliable connection between the edge-wrapping rubber strip 9 and the belt layer edge wrapping.

[0055] This embodiment also discloses a belt layer edge-wrapping structure. The belt layer edge-wrapping structure of this embodiment is formed using the above-mentioned edge-wrapping device. The belt layer edge-wrapping structure includes an edge-wrapping body 91 and an extension edge 92. The cross-section of the edge-wrapping body 91 is a right-angled triangle. The extension edge 92 is located on one of the acute angle sides of the edge-wrapping body 91. The extension edge 92 is pressed and bonded to the upper surface of the belt layer fabric 8 by the pressing flange 44.

[0056] Example 2

[0057] Reference Figure 6 The difference between this embodiment and embodiment 1 is that the axis of the upper forming roller 41 and the axis of the lower forming roller 42 are parallel to each other, the outer circumferential surface of the upper forming roller 41 is set as a conical surface, and the diameter of the upper forming roller 41 gradually decreases along the direction close to the conveyor belt 2.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A splicing device for the production of radial tyres, characterized in that: The installation rack (1) is provided with a conveying belt (2) for conveying the belt layer (8), two extruders (3) for extruding the edge coating strip (9), and two molding mechanisms (4) for extruding and covering the edge coating strip (9) to the edge of the belt layer (8); two molding mechanisms (4) are respectively arranged corresponding to two extruders (3), and two molding mechanisms (4) are respectively arranged on both sides of the conveying belt (2); the molding mechanism (4) comprises an upper molding roller (41) and a lower molding roller (42), the upper molding roller (41) and the lower molding roller (42) are used for jointly rolling the edge coating strip (9), the upper molding roller (41) and the lower molding roller (42) form a molding angle (43) therebetween, the upper molding roller (41) is provided with an edge pressing flange (44) near one end of the conveying belt (2), the outer periphery of the edge pressing flange (44) is a conical surface, the included angle between the outer periphery of the edge pressing flange (44) and the outer periphery of the main part of the upper molding roller (41) is towards the inner side of the molding angle (43), and the edge pressing flange (44) is used for extruding the edge coating strip (9) to form an extended edge on the edge part of the upper surface of the belt layer (8).

2. A splicing device for radial tyre production according to claim 1, characterized in that: The conical surface of the edge pressing flange (44) is provided with a plurality of pressing protrusions.

3. A splicing device for radial tyre production according to claim 1, characterized in that: The lower molding roller (42) is provided with a first limiting flange (421) at one end away from the conveying belt (2), the upper molding roller (41) is provided with a second limiting flange (411) at one end away from the conveying belt (2), the first limiting flange (421) and the second limiting flange (411) are arranged in correspondence with each other, and the outer periphery of the first limiting flange (421) abuts against the outer periphery of the second limiting flange (411).

4. A splicing device for radial tyre production according to claim 1, characterized in that: The installation rack (1) is provided with a pressing roller mechanism (6) located between the two molding mechanisms (4), the pressing roller mechanism (6) comprises an upper pressing roller (61) and a lower pressing roller (62), and the pressing roller mechanism (6) is used for rolling the part of the belt layer (8) close to the molding mechanism (4).

5. A splicing device for radial tyre production according to claim 4, characterized in that: The pressing roller mechanism (6) is used for rolling the belt layer (8) in the full width range, the pressing roller mechanism (6) is provided with two first pressing roller mechanisms (601) and second pressing roller mechanisms (602), the first pressing roller mechanism (601) and the second pressing roller mechanism (602) are arranged side by side along the conveying direction of the conveying belt (2), the rolling speed of the first pressing roller mechanism (601) is the same as the conveying speed of the conveying belt (2), the rolling speed of the first pressing roller mechanism (601) is smaller than the rolling speed of the second pressing roller mechanism (602), and the belt layer (8) passes through the first pressing roller mechanism (601), the molding mechanism (4) and the second pressing roller mechanism (602) in sequence when the conveying belt (2) operates.

6. A splicing device for radial tyre production according to claim 5, characterized in that: Two ends of the upper compression roller (61) of the first compression roller mechanism (601) are respectively provided with guide flanges (611), and the two guide flanges (611) are respectively used for abutting against two side edges of the belt layer (8).

7. A splicing device for radial tyre production according to claim 6, characterized in that: End faces of opposite ends of the two guide flanges (611) are respectively provided with limiting protrusions (612), the limiting protrusions (612) have a diameter smaller than that of the guide flanges (611), and the two limiting protrusions (612) are respectively used for abutting against edges of the rubber body of the belt layer (8).

8. A splicing device for radial tyre production according to claim 1, characterized in that: The mounting rack (1) is provided with an auxiliary edge pressing mechanism (7), the auxiliary edge pressing mechanism (7) comprises a driving pulley (71), a driven pulley (72) and a transmission belt (73), the axes of the driving pulley (71) and the driven pulley (72) are arranged in the vertical direction, the transmission belt (73) is connected with the driving pulley (71) and the driven pulley (72) respectively, the transmission belt (73) is provided with a groove (731) along the whole length in the extending direction of the transmission belt (73), and the groove (731) is used for avoiding the edge covering rubber strip (9) wrapped on the belt layer (8).

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