Mouth-shaped plate for improving extrusion rubber mixing of tread rubber

Abstract

The utility model relates to the field of tire production molds, and discloses a mouth-shaped plate for improving extrusion rubber mixing of tread rubber, which comprises an upper mouth-shaped plate and a lower mouth-shaped plate which are detachably and fixedly connected together, a central groove is arranged in the middle of the lower part of the upper mouth-shaped plate, rubber guide grooves are respectively processed in the upper mouth-shaped plate and positioned on two outer sides of the central groove, and the rubber guide grooves are communicated with the upper mouth-shaped plate and the lower mouth-shaped plate. Two oblique angles with different angles are formed at the lower edge of the glue guide groove, and the glue guide groove is communicated with the central groove at the two oblique angles; and the central groove and the lower part of the glue guide groove are sealed by a lower mouth-shaped plate. Through the improved design of the tread rubber mouth-shaped plate, the bad phenomenon of rubber mixing in the production process is improved, through the integrated tread rubber extrusion, the stability of the size is confirmed, the performance of the product is improved, and the situation of rubber mixing during extrusion of various rubber materials of the tread rubber is avoided.

Description

Technical Field

[0001] The utility model relates to the field of tire production molds, in particular to a die plate for improving the rubber sticking during tread rubber extrusion. Background Art

[0002] A tire is a mixture of multiple material components. The outermost surface of the tire is the tread rubber. As the only part of the tire that contacts the ground, the tread rubber is required to have basic wear resistance, grip, comfort, heat resistance, anti-aging and other properties. At present, the main components of the tread rubber are the crown rubber, wing rubber and buffer rubber. The performance mentioned above is mainly the performance requirements of the crown rubber, and the wing rubber is the rubber material located at the junction of the crown rubber and the tire sidewall. This rubber material mainly plays a role in buffering transition. The composite structure of the wing rubber 12 and the crown rubber 11 is as shown in FIG. Figure 1 As shown. Because the hardness of the crown rubber is higher than that of the rubber on the tire sidewall, and the tire is subjected to bending from the shoulder to the sidewall during daily driving, if the tire directly transitions from the hard rubber on the crown to the soft rubber on the sidewall, it is easy to cause adverse phenomena during tire production and after use. Therefore, wing rubber is designed on both ends of the tread rubber, and this wing rubber is usually not wear-resistant. Due to the production process, the tread rubber is extruded, that is, the crown rubber and the wing rubber are extruded in one piece through the tread mouth plate. During the production process, the outer mouth plate is inevitably deformed after long-term use. The deformed outer mouth plate easily causes the wing rubber to be connected with the crown rubber of the tread rubber through the deformed mouth plate in advance and squeezed out, so that the crown part of the tread rubber is mixed with wing rubber (such as Figure 2 As shown), it affects the wear performance of the tire. Utility Model Content

[0003] In order to solve the existing problems, the utility model provides an outer die plate for improving the tread rubber extrusion and glue sticking. It adopts a brand-new die structure design, which can 100% realize the extrusion boundary of the two rubber materials of the tread rubber (i.e., the crown rubber and the wing rubber), and avoid the edge wing rubber from sticking to the outer surface of the crown rubber, thereby stabilizing the quality of the product and reducing quality risks.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A die plate for improving tread rubber extrusion and cross-linking, comprising an upper die plate and a lower die plate, the two being detachably fixedly connected together, a central groove being provided in the middle of the lower part of the upper die plate, rubber guide grooves being processed on the two outer sides of the central groove in the upper die plate, two bevels of different angles being formed at the lower edge of the rubber guide groove, the rubber guide groove being connected with the central groove at the two bevels; the lower die plate encloses the central groove and the lower part of the rubber guide groove.

[0006] The term "T-type" refers to the shape of the guide groove having the basic shape of the letter T.

[0007] The term "detachably" means that the fixed connection is made by conventional connection methods such as bolts, and when necessary, the upper die plate and the lower die plate can be separated and are easy to separate.

[0008] The term "rubber crossover" refers to the presence of wing rubber mixed in the crown area of ​​the tread rubber, such as Figure 2 shown.

[0009] The term "bevel" refers to an inclined corner, and both bevels are obtuse angles so as to facilitate the wing rubber to be closely compounded with the two sides of the cap rubber.

[0010] The upper die plate and the lower die plate are fixedly connected by bolts.

[0011] The glue guiding groove is a T-shaped glue guiding groove, which includes a transverse groove and a longitudinal groove, and the transverse groove is vertically connected with the longitudinal groove.

[0012] The bevel angle includes a first bevel angle and a second bevel angle, and the lower edge opening of the longitudinal groove has a front bevel portion, a rear bevel portion, a front horizontal edge portion, and a rear horizontal edge portion; the front bevel portion and the front horizontal edge portion are connected to form a first bevel angle, and the rear bevel portion and the rear horizontal edge portion are connected to form a second bevel angle, and the angle of the first bevel angle is smaller than that of the second bevel angle.

[0013] The first oblique angle and the second oblique angle are both obtuse angles.

[0014] The front bevel portion and the rear bevel portion are projected on the same horizontal plane, and the lower ends of the latter are 7 mm apart.

[0015] Positioning pins are arranged between the upper die plate and the lower die plate for positioning.

[0016] The beneficial effects of the utility model are as follows: the undesirable phenomenon of rubber sticking during the production process is improved through the improved design of the tread rubber mouth plate, and the dimensional stability is confirmed and the performance of the product is improved through the integrated tread rubber extrusion, thereby avoiding the occurrence of rubber sticking when extruding multiple rubber materials of the tread rubber. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the current tread rubber composite structure;

[0018] Figure 2 This is a schematic diagram of the current tread rubber sticking structure after extrusion;

[0019] Figure 3 This is a front view of the tread rubber mouth plate of the utility model;

[0020] Figure 4 This is a front view of the upper mold plate of the tread rubber of the utility model;

[0021] Figure 5 for Figure 4 A magnified view of part A in FIG.

[0022] Figure 6 This is a three-dimensional diagram of the upper mold plate of the tread rubber of the utility model;

[0023] Figure 7 This is a rear view of the tread rubber mouth plate of the utility model;

[0024] Figure 8 This is a bottom view of the upper mold plate of the tread rubber of the utility model;

[0025] In the figure, 1, upper mold plate; 2, lower mold plate; 3, bolt; 4, positioning pin; 5, transverse slot; 6, longitudinal slot; 7, center groove; 8, first bevel; 9, T-shaped rubber guide groove; 10, second bevel; 11, crown rubber; 12, wing rubber;

[0026] 601, front oblique edge; 602, rear oblique edge; 603, front horizontal edge; 604, rear horizontal edge. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0028] like Figure 3 As shown, the die plate for improving tread rubber extrusion and sticking (hereinafter referred to as die plate) of the utility model comprises an upper die plate 1, a lower die plate 2, bolts 3 and positioning pins 4; the upper die plate 1 is connected to the lower die plate 2 via bolts 3, and bolts 3 are provided on both outer sides of the die plate, and positioning pins 4 for connecting the upper die plate 1 to the lower die plate 2 are provided on both outer sides.

[0029] Optional, such as Figure 5 As shown, bolt holes and positioning pin holes can be set on both sides of the upper mold plate, such as Figure 3 As shown, countersunk holes are provided at positions corresponding to the bolt holes on both sides of the lower die plate, and the upper die plate 1 and the lower die plate 2 are fixed together by inserting bolts into the bolt holes. Positioning pins 4 are provided on both sides of the lower die plate, and each side of the die plate is fixed with two bolts. Each positioning pin 4 is arranged between two countersunk holes. The positioning pins are first inserted into the positioning pin holes of the upper die plate, and then the upper die plate and the lower die plate are fixed with bolts. This makes it easier to achieve the corresponding holes of the upper die plate and the lower die plate, and facilitates quick bolt fixing.

[0030] The positions of the countersunk holes, bolt holes, and locating pins can be changed between the upper die plate 1 and the lower die plate 2 as long as the connection and fixation of the upper die plate 1 and the lower die plate 2 are achieved.

[0031] A central groove 7 for forming the tread rubber is processed in the middle of the lower part of the upper die plate 1, and the extruder head of the extruder is connected to the central groove 7 of the die plate through a pre-die. Figure 3 As shown, it can be understood as a perpendicular Figure 3 The pre-mouth shape of the center groove 7 shown in the figure extrude the crown rubber into the center groove 7, and it should not be understood that the rubber guide groove is set in the upper or lower mold plate to extrude the crown rubber. T-shaped rubber guide grooves 9 are respectively processed on the two outer sides of the center groove 7 in the upper mold plate 1. The T-shaped rubber guide groove 9 is composed of a transverse groove 5 and a longitudinal groove 6. The transverse groove 5 is vertically connected with the longitudinal groove 6; the lower edge of the longitudinal groove 6 forms two bevels with different angles (a first bevel 8 and a second bevel 10), and the T-shaped rubber guide groove 9 is connected with the center groove 7 at the two bevels, and the first bevel 8 and the second bevel 10 are both obtuse angles. The lower mold plate 2 closes the center groove 7 and the lower part of the T-shaped rubber guide groove 9 so that the crown rubber and the wing rubber are confined to the center groove 7 after being extruded.

[0032] like Figures 4 to 6 As shown, the longitudinal slot 6 has a front bevel portion 601, a rear bevel portion 602, a front horizontal edge portion 603, and a rear horizontal edge portion 604 at the lower edge opening. The front bevel portion 601 on the left side of the die plate and the front bevel portion 601 on the right side of the die plate jointly limit the width of the crown rubber in the tread rubber. More specifically, the distance between the lower ends of the two front bevel portions on the left and right sides is the crown rubber width L1, which is also the width that the pre-die of the extruder for extruding the crown rubber needs to match. The rear bevel portion 602 on the left side of the die plate and the rear bevel portion on the right side of the die plate jointly limit the total width L of the tread rubber. More specifically, the distance between the lower ends of the two rear bevel portions on the left and right sides is the total width of the tread rubber. The difference between the total width of the tread rubber and the total width of the crown rubber is the wing rubber width L2 (i.e., L-L1=L2). It needs to be explained that the "crown rubber width", "total width of the tread rubber" and "wing rubber width" referred to here are all the widths occupied by the corresponding rubber on the lower mouth plate.

[0033] The front bevel portion 601 and the front horizontal portion 603 are connected to form a first bevel angle 8, and the rear bevel portion 602 and the rear horizontal portion 604 are connected to form a second bevel angle 10. Due to the different degrees of inclination of the front bevel portion 601 and the rear bevel portion 602, the angle of the first bevel angle 8 is smaller than the angle of the second bevel angle 10. Further, the front opening of the center groove 7 is smaller than the rear opening. The front opening is the opening of the center groove 7 between the front bevel portion 601 on the left side of the die plate and the front bevel portion 601 on the right side of the die plate, and the rear opening is the opening of the center groove 7 between the rear bevel portion 602 on the left side of the die plate and the rear bevel portion on the right side of the die plate.

[0034] The extruder head of the extruder is connected to the center groove 7 through a pre-mouth opening from the front side of the center groove 7, so the width of the crown rubber extruded by the extruder is equal to L1. The wing rubber is extruded from the T-shaped rubber guide groove 9 and compounded on both sides of the crown rubber. The width of the wing rubber is L2. The total width L of the tread rubber is the sum of L1 and L2.

[0035] Alternatively, if Figure 7 As shown, the front bevel portion 601 and the rear bevel portion 602 are projected on the same horizontal plane, and the lower ends of the latter two are 7 mm apart.

[0036] Figure 8 The position of the longitudinal slot 6 of the upper mold plate is shown, and two T-shaped glue guide grooves are respectively located on both sides of the central groove 7, so the passage openings of the two longitudinal slots 6 can be seen at the bottom of the upper mold plate.

[0037] The specific implementation process of the utility model is as follows: when the tread rubber is extruded, two rubber materials (tread crown rubber and wing rubber) are extruded, wherein the tread crown rubber is extruded through the front opening of the central groove 7 of the die plate of the utility model by the head of the extruder (also called extruder), and the wing rubber is extruded through the transverse groove 5 of the die plate of the utility model to the longitudinal groove 6 by the extruder head of the extruder, and then merged with the tread crown rubber flowing out of the central groove 7 from the channel opening between the first bevel 8 and the second bevel 10 to form an integrated extrusion, thereby achieving the following Figure 1 The die plate of the utility model accurately guides the wing rubber directly to the two sides of the crown rubber through the T-shaped rubber guide groove, and the crown rubber and the wing rubber are extruded in one piece, which avoids the wing rubber from flowing to the crown part and ensures the quality requirements of the tread rubber.

[0038] Although the utility model is described herein with reference to the illustrative embodiments of the utility model, it should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in the present application. More specifically, within the scope disclosed in the present application, multiple variations and improvements can be made to the components and / or layout of the subject combination layout. In addition to the variations and improvements made to the components and / or layout, other uses will also be obvious to those skilled in the art.

Claims

1. A die plate for improving tread rubber extrusion and cross-linking, characterized in that: It includes an upper mold plate and a lower mold plate, which are detachably fixed together. A central groove is provided in the middle of the lower part of the upper mold plate. Glue guide grooves are processed on both outer sides of the central groove in the upper mold plate. Two bevels with different angles are formed at the lower edge of the glue guide groove. The glue guide groove is connected with the central groove at the two bevels. The lower mold plate closes the central groove and the lower part of the glue guide groove.

2. The die plate for improving tread rubber extrusion sticking according to claim 1, characterized in that: The upper die plate and the lower die plate are fixedly connected by bolts.

3. The die plate for improving tread rubber extrusion sticking according to claim 1, characterized in that: The glue guiding groove is a T-shaped glue guiding groove, which includes a transverse groove and a longitudinal groove, and the transverse groove is vertically connected with the longitudinal groove.

4. The die plate for improving tread rubber extrusion sticking according to claim 3, characterized in that: The bevel angle includes a first bevel angle and a second bevel angle, and the lower edge opening of the longitudinal groove has a front bevel portion, a rear bevel portion, a front horizontal edge portion, and a rear horizontal edge portion; the front bevel portion and the front horizontal edge portion are connected to form a first bevel angle, and the rear bevel portion and the rear horizontal edge portion are connected to form a second bevel angle, and the angle of the first bevel angle is smaller than that of the second bevel angle.

5. The die plate for improving tread rubber extrusion sticking according to claim 4, characterized in that: The front bevel portion and the rear bevel portion are projected on the same horizontal plane, and the lower ends of the latter are 7 mm apart.

6. The die plate for improving tread rubber extrusion sticking according to claim 5, characterized in that: The first oblique angle and the second oblique angle are both obtuse angles.

7. The die plate for improving tread rubber extrusion sticking according to claim 1, characterized in that: Positioning pins are arranged between the upper die plate and the lower die plate for positioning.

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