Multi-composite tire tread extrusion device and method thereof

Abstract

The invention provides a multi-composite tire tread extrusion device which comprises an extrusion runner, a first preformed die, a second preformed die and a die box, the extrusion runner is connected with an extruder, the first preformed die is inserted into the upper portion of the second preformed die and used for extruding a pattern groove, and the first preformed die is integrally embedded into the die box after being matched with the second preformed die. The extrusion runner is connected with the mouth shape box, various tread rubber enters the first pre-mouth shape and the second pre-mouth shape through different channels of the extrusion runner, semi-finished tire treads with equivalent density are extruded by using the tread rubber with different properties under the action of the first pre-mouth shape and the second pre-mouth shape, and the type of the tread rubber of the tire shoulder is changed. Compared with the prior art, the anti-eccentric wear performance of the shoulder is enhanced, meanwhile, the type of the rubber material at the pattern groove is changed, the rubber material is distinguished from the rubber material at the tread strip part, the anti-biting and anti-chipping performance of the pattern groove is further enhanced, the service life of the low-rolling-resistance tire is prolonged, the formula of the whole tread does not need to be adjusted again, and the research and development cost of an enterprise is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of tire manufacturing, and in particular to a multi-composite tire tread extrusion device and method. Background Art

[0002] From bias tires to radial tires, people have been pursuing better tire performance through continuous improvements in tire structure. In order to save energy and reduce emissions and reduce the use of fossil energy, the production of low rolling resistance tires has become a new direction in current tire manufacturing.

[0003] At present, although the low rolling resistance tires on the market have fuel-saving characteristics, they have many restrictions on use and can generally only be used in good road conditions such as long-distance highways. In addition, during use, they are very prone to shoulder wear, tread groove damage and block loss, and often cannot be used to the end, affecting the service life of the tire.

[0004] In order to solve the problem of uneven shoulder wear, many tire manufacturers choose to use shoulder wing rubber to improve the uneven wear resistance of tires. However, in order to solve the problem of tread groove damage and block loss, it is often necessary to change the tread formula, and the change of tread formula often requires the entire tread rubber to change. If the entire tread formula is replaced, the company's R&D costs will be greatly increased and the R&D cycle will be long.

[0005] At present, in order to enhance the anti-bite and block-falling performance of the tread grooves, many companies usually work hard on the tread patterns, such as adding tread arcs at the edges of the tread grooves, or using progressive steps. However, this method can only solve part of the problem of tread groove biting and block-falling in the early stage. If encountering a harsh gravel road, a large area of ​​biting and block-falling will still occur.

[0006] In the manufacturing process of tire tread, an extruder is required to extrude the rubber compound to form a semi-finished tread. Most of the existing extruders are universal, which cannot change the size of the shoulder and reduce the uneven wear of the shoulder. At the same time, they cannot extrude the grooves synchronously or adjust the type of rubber compound at the grooves, and cannot further enhance the anti-bite and block performance of the grooves. Summary of the invention

[0007] The purpose of the present invention is to solve the deficiencies of the above-mentioned technology and to provide a multi-composite tire tread extrusion device and method.

[0008] To this end, the present invention provides a multi-composite tire tread extrusion device, including an extrusion flow channel, a first pre-die, a second pre-die and a die box, the extrusion flow channel is connected to the extruder, the first pre-die is inserted into the upper part of the second pre-die for extruding a tread groove, the second pre-die is embedded in the die box, the extrusion flow channel is connected to the die box, and a variety of tread rubbers enter the first pre-die and the second pre-die through different channels of the extrusion flow channel.

[0009] Preferably, the tread rubber includes a first tread rubber, a second tread rubber, a third tread rubber and a fourth tread rubber, the first tread rubber enters the first pre-mouth mold, the second tread rubber, the third tread rubber and the fourth tread rubber all enter the second pre-mouth mold, and are respectively used to form a tread strip, a shoulder and a lower tread, a plurality of the pattern grooves are arranged at intervals on the tread strip, both sides of the tread strip are the shoulders, and the shoulders and the bottom of the tread strip are the lower tread.

[0010] Preferably, the first pre-die includes a glue inlet channel 1 and a plurality of groove extrusion channels, the glue inlet channel 1 is connected with the plurality of groove extrusion channels, and the bottom of the groove extrusion channel is an isosceles trapezoid or a semicircular arc.

[0011] Preferably, the bottom of the groove extrusion channel is an isosceles trapezoid, and the groove extrusion channel includes a bottom plate, two vertical plates and two inclined plates, one end of the vertical plate is fixedly installed at the glue outlet of the glue inlet channel 1, and the other end is fixedly connected to the inclined plate, the two vertical plates are arranged in parallel, and the two inclined plates are fixedly connected through the bottom plate, the angle between the inclined plate and the bottom plate is 120-150°, the angle between the inclined plate and the vertical plate is 120-150°, and the length of the inclined plate is greater than 2mm.

[0012] Preferably, the bottom of the groove extrusion channel is a semicircular arc, the vertical plate and the bottom plate are connected by an arc plate, the arc plate is tangent to the vertical plate and the bottom plate at the same time, and the radius of the arc plate is greater than 2 mm.

[0013] Preferably, the glue inlet channel 1 is composed of an upper sealing plate, a lower sealing plate and two side plates, the bottoms of the two side plates are fixedly connected through the lower sealing plate, the upper sealing plate is fixedly connected to the tops of the two side plates and extends to the top of the groove extrusion channel, the vertical cross-section of the lower sealing plate is a trapezoid, the rear thickness of the trapezoid is greater than 5 mm, the front thickness is less than 2 mm, the front thickness of the upper sealing plate is greater than 5 mm, the side plate and the lower sealing plate are transitioned by a fillet 1, and the diameter of the fillet 1 is greater than 10 mm.

[0014] Preferably, the second pre-mouth shape includes an insertion channel, a second tread rubber inlet channel, a third tread rubber inlet channel and a fourth tread rubber inlet channel, the insertion channel is adapted to be inserted into the first pre-mouth shape, the third tread rubber inlet channel is arranged on both sides of the insertion channel, the second tread rubber inlet channel is arranged below the insertion channel and the third tread rubber inlet channel, and the fourth tread rubber inlet channel is arranged below the second tread rubber inlet channel.

[0015] Preferably, the inclinations of the bottom surface of the insertion channel and the top surface of the second tread rubber inlet channel are both greater than 10°, the rear cross-sectional area of ​​the third tread rubber inlet channel is greater than its front cross-sectional area, the front bottom edge of the third tread rubber inlet channel is connected to the upper bevel close to the insertion channel, the top of the upper bevel is connected to the vertical edge, the angles between the bottom edge and the upper bevel, and between the upper bevel and the vertical edge are both greater than 120°, the rear cross-sectional area of ​​the second tread rubber inlet channel is greater than twice its front cross-sectional area, the two sides of the outlet on the front side of the second tread rubber inlet channel are acute-angle structures extending outward, and the top of the fourth tread rubber inlet channel is a concave structure that is thick in the middle and thin on both sides.

[0016] Preferably, the extrusion flow channel includes a first flow channel, a second flow channel, a third flow channel and a fourth flow channel from top to bottom, the first flow channel is used to pass the third tread rubber, the second flow channel is used to pass the first tread rubber, the third flow channel is used to pass the second tread rubber, and the fourth flow channel is used to pass the fourth tread rubber. The second flow channel is gradually tightened from back to front, and two periscope channels are formed on both sides of the first flow channel. The periscope channel is a Z-shaped structure, and the front glue outlet of the periscope channel extends to both sides of the front glue outlet of the second flow channel.

[0017] A multi-composite tire tread extrusion method comprises the following steps:

[0018] S1, the extrusion flow channel is fixedly installed on the extruder, the first pre-die is inserted into the upper part of the second pre-die, and then the second pre-die is embedded in the die box, the front side of the die box is clamped with a die plate, and finally the die box is fixedly installed on the extrusion flow channel;

[0019] S2, the first tread rubber enters the groove extrusion channel along the second flow channel; the second tread rubber enters the second tread rubber inlet channel along the third flow channel; the third tread rubber enters the third tread rubber inlet channel along the first flow channel; the fourth tread rubber enters the fourth tread rubber inlet channel along the fourth flow channel;

[0020] S3, the first tread rubber, the second tread rubber, the third tread rubber and the fourth tread rubber are extruded along the contour on the die plate to form a semi-finished tire tread.

[0021] The beneficial effects of the present invention are as follows: the present invention provides a multi-composite tire tread extrusion device and method, which have the following beneficial effects.

[0022] (1) A variety of tread rubbers with different properties are sequentially passed through the extrusion flow channel, the first pre-die and the second pre-die, the die box and the die plate. Under the action of the first pre-die, the second pre-die and the die box, the groove, the tread strip, the shoulder and the lower tread are synchronously extruded to form an integral body, thereby enhancing the fit between the components. Then, the semi-finished tire tread with equivalent density is extruded according to the specific shapes and sizes of the first pre-die and the second pre-die, thereby changing the size and shape of the shoulder and enhancing the anti-eccentric wear performance of the shoulder. At the same time, the type of rubber at the groove is also changed to distinguish it from the rubber at the tread strip, further enhancing the anti-bite and block drop performance of the groove and enhancing the service life of the low rolling resistance tire;

[0023] (2) Using a combination of various tread rubbers to extrude semi-finished tire treads eliminates the need to readjust the formula of the entire tread, reducing the company's R&D costs. Existing tread rubbers can be directly used to produce low rolling resistance tire treads. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the back structure of the multi-composite tire tread extrusion device in this embodiment;

[0025] Figure 2 is a schematic diagram of the front structure of the multi-composite tire tread extrusion device in this embodiment;

[0026] Figure 3 It is a structural schematic diagram of the first pre-mouth type in this embodiment;

[0027] Figure 4 is a schematic diagram of the structure of the groove extrusion channel in this embodiment;

[0028] Figure 5 is a schematic structural diagram of the lower sealing plate of the first pre-mouth type in this embodiment;

[0029] Figure 6 Schematic diagram of the structure of the second pre-mouth type in this embodiment;

[0030] Figure 7 is a schematic diagram of the back structure of the second pre-mouth shape in this embodiment;

[0031] Figure 8 Schematic diagram of the back structure of the mouth-shaped box in this embodiment;

[0032] Fig. 9 Schematic diagram of the front structure of the mouth-shaped box in this embodiment;

[0033] Fig.10 Schematic diagram of the structure of the die plate in this embodiment;

[0034] Fig.11 Schematic diagram of the back structure of the extrusion flow channel in this embodiment;

[0035] Fig.12 Schematic diagram of the front structure of the extrusion flow channel in this embodiment;

[0036] Fig.13 Schematic diagram of the structure of a semi-finished tire tread extruded from four types of tread rubbers in this embodiment.

[0037] Markings in the figure: 1, extrusion channel; 11, first flow channel; 12, second flow channel; 13, third flow channel; 14, fourth flow channel; 15, periscope channel; 2, first pre-mouth shape; 21, glue inlet channel 1; 211, upper blocking plate; 212, lower blocking plate; 213, side plate; 214, fillet 1; 22, pattern groove extrusion channel; 221, bottom plate; 222, vertical plate; 223, inclined plate; 3, second pre-mouth shape; 31, Insertion channel; 32, second tread rubber inlet channel; 33, third tread rubber inlet channel; 34, fourth tread rubber inlet channel; 35, bottom edge; 36, upper bevel; 37, vertical edge; 38, second fillet; 39, lower bevel; 4, mouth box; 5, pattern groove; 6, tread strip; 7, shoulder; 8, lower tread; 9, mouth plate; 10, lower edge; 16, trapezoidal mouth; 17, rectangular mouth; 18, wedge-shaped mouth; 19, contour. DETAILED DESCRIPTION

[0038] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments to help understand the content of the present invention. The methods used in the present invention are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercial products unless otherwise specified.

[0039] Example:

[0040] like Figures 1 to 13 As shown, the present invention provides a multi-composite tire tread extrusion device, including an extrusion flow channel 1, a first pre-die 2, a second pre-die 3 and a die box 4, the extrusion flow channel 1 is connected to the extruder, the first pre-die 2 is tilted downward and inserted into the upper part of the second pre-die 3, for extruding a pattern groove 5, in the actual production process, the first pre-die 2 of different specifications can be replaced at any time according to the needs of the tread pattern, the second pre-die 3 is embedded in the die box 4, the extrusion flow channel 1 is connected to the die box 4, and a variety of tread rubbers enter the first pre-die 2 and the second pre-die 3 through different channels of the extrusion flow channel 1.

[0041] Further, the tread rubber includes a first tread rubber, a second tread rubber, a third tread rubber and a fourth tread rubber, the first tread rubber is a tread rubber with high hardness and puncture resistance and tear resistance, the second tread rubber is a tread rubber with small hysteresis loss, the third tread rubber is a tread rubber with wear resistance, puncture resistance and good heat dissipation performance, and the fourth tread rubber is a tread rubber that reduces heat generation. The first tread rubber enters the first pre-mouth mold 2, and the second tread rubber, the third tread rubber and the fourth tread rubber all enter the second pre-mouth mold 3, which are respectively used to form a tread strip 6, a shoulder 7 and a lower tread 8, as shown in FIG. Fig.13 As shown, a plurality of the grooves 5 are arranged at intervals on the tread strip 6, and the plurality of grooves 5 divide the tire tread into a plurality of circumferentially surrounding tread strips 6. Both sides of the tread strip 6 are the shoulders 7, and the shoulders 7 are quasi-right-angled trapezoids. The bottom of the shoulders 7 and the tread strip 6 is the lower tread 8.

[0042] Different types of tread rubber usually have good elasticity, toughness and tensile strength as well as good ductility and fluidity after heating, but the different properties lead to different hardness and density of the rubber during extrusion. In order to ensure that the fitting surfaces of different rubbers are tight and the density of rubbers at different positions is equivalent, after the rubber flows out through the extrusion flow channel 1, the distance between the inflection points of the surfaces and surfaces flowing to each area of ​​the pre-mouth shape should not differ much. To this end, the dimensions of the inflection point connection between the surfaces of the first and second pre-mouth shapes should meet the corresponding dimensional parameter requirements. By limiting the dimensional parameters, the phenomenon of pores at the connection between different rubbers during the initial compounding process can be reduced, the contact area between the rubbers can be enhanced, and the overall qualification rate and durability of the tire can be improved.

[0043] The specific size parameters of the first pre-mouth shape 2 and the second pre-mouth shape 3 are as follows:

[0044] The number of the grooves 5 is generally 1-6. The width and depth of the grooves 5 are related to the use environment of the tire. The width is generally 2-30 mm and the depth is 5-30 mm. In this embodiment, the number of the grooves 5 is four.

[0045] Further, such as Figures 3 to 5 As shown, the first pre-mouth mold 2 includes a glue feed channel 21 and four groove extrusion channels 22, the glue feed channel 21 is connected to the four groove extrusion channels 22, the feed port area of ​​the glue feed channel 21 is much larger than the extrusion area of ​​the groove extrusion channel 22, thereby increasing the glue outlet pressure of the groove extrusion channel 22, so that the density of the first tread rubber is higher when it is extruded, the width of the upper part of the groove extrusion channel 22 is 1-3mm wider on both sides than the designed width of the groove 5, and the depth is 1-3mm deeper than the designed depth of the groove 5, which is used to ensure that the groove wall and bottom of the groove 5 are covered with the first tread rubber, and the bottom of the groove extrusion channel 22 is an isosceles trapezoid or a semicircular arc.

[0046] Furthermore, the bottom of the groove extrusion channel 22 is an isosceles trapezoid, and the groove extrusion channel 22 includes a bottom plate 221, two vertical plates 222 and two inclined plates 223, one end of the vertical plate 222 is fixedly installed at the glue outlet of the glue inlet channel 21, and the other end is fixedly connected to the inclined plate 223, the two vertical plates 222 are arranged in parallel, and the two inclined plates 223 are fixedly connected through the bottom plate 221, the angle between the inclined plate 223 and the bottom plate 221 is 120-150°, the angle between the inclined plate 223 and the vertical plate 222 is 120-150°, and the length of the inclined plate 223 is greater than 2mm.

[0047] Furthermore, the bottom of the groove extrusion channel 22 can also be a semicircular arc, and the vertical plate 222 and the bottom plate 221 are connected by an arc plate, and the arc plate is tangent to the vertical plate 222 and the bottom plate 221 at the same time, and the radius of the arc plate is greater than 2 mm.

[0048] Further, the glue inlet channel 21 is composed of an upper blocking plate 211, a lower blocking plate 212 and two side plates 213. The bottoms of the two side plates 213 are fixedly connected through the lower blocking plate 212. The upper blocking plate 211 is fixedly connected to the tops of the two side plates 213 and extends to the top of the groove extrusion channel 22. The vertical section of the lower blocking plate 212 is a trapezoid. The rear thickness of the trapezoid is greater than 5 mm and the front thickness is less than 2 mm. The rear thickness can maintain the overall rigidity of the first pre-mouth shape 2, and the front thickness can make The height difference between the upper and lower rubber materials at the glue outlet is small, and they are in contact and compounded at a faster speed. The thickness of the front part of the upper sealing plate 211 is greater than 5 mm. The side plate 213 and the lower sealing plate 212 are transitioned by a rounded corner 214. The diameter of the rounded corner 214 is greater than 10 mm. The setting of the rounded corner 214 allows the first pre-mouth shape 2 to be smoothly installed on the second pre-mouth shape 3 to prevent the edges from colliding and causing the two to fit unsmoothly. The width of the side plate 213 is 15-25 mm, thereby ensuring the overall rigidity of the first pre-mouth shape 2.

[0049] Further, such as Figure 6 and Figure 7 As shown, the second pre-mouth mold 3 includes an insertion channel 31, a second tread rubber inlet channel 32, a third tread rubber inlet channel 33 and a fourth tread rubber inlet channel 34, the insertion channel 31 is adapted to be inserted into the first pre-mouth mold 2, the third tread rubber inlet channel 33 is arranged on both sides of the insertion channel 31, the second tread rubber inlet channel 32 is arranged below the insertion channel 31 and the third tread rubber inlet channel 33, and the fourth tread rubber inlet channel 34 is arranged below the second tread rubber inlet channel 32.

[0050] Furthermore, the bottom surface of the insertion channel 31 and the top surface of the second tread rubber inlet channel 32 are both inclined at a degree greater than 10°, thereby enhancing the contact pressure during the compounding of the rubber materials.

[0051] The rear cross-sectional area of ​​the third tread rubber inlet channel 33 is larger than its front cross-sectional area, so as to increase the rubber pressure at the third tread rubber outlet by reducing the cross-sectional area and improve the rubber density. The front bottom edge 35 of the third tread rubber inlet channel 33 is connected to the upper bevel 36 close to the insertion channel 31, and the top of the upper bevel 36 is connected to the vertical edge 37. The angles between the bottom edge 35 and the upper bevel 36, and between the upper bevel 36 and the vertical edge 37 are all greater than 120°. The vertical edge 37 and the upper bevel 36 are transitioned by the fillet 38, so that the difference in the flow radius of the third tread rubber in the third tread rubber inlet channel 33 is small, the pores at the rubber connection are reduced, and no corner jamming occurs.

[0052] The rear cross-sectional area of ​​the second tread rubber inlet channel 32 is larger than twice its front cross-sectional area, which increases the pressure at the rubber outlet and facilitates the second tread rubber to be squeezed out after compression. The two sides of the rubber outlet on the front side of the second tread rubber inlet channel 32 are acute-angle structures extending outward, which limit the extrusion shape and size of the third tread rubber and the fourth tread rubber.

[0053] The top of the fourth tread rubber inlet channel 34 is a concave structure with a thick middle and thin sides. The fourth tread rubber inlet channel 34 is arranged tilted from bottom to top, and the tilt angle is greater than 12°. The concave structure is composed of a bottom edge 35, a lower bevel 39 and a lower edge 10 of the second tread rubber inlet channel 32. The lower bevel 39 arranged tilted upward is fixedly installed on both sides of the lower edge 10. The transverse bottom edge 35 is fixedly installed on both sides of the lower bevel 39 to make the interface transition uniform and increase the thickness of both sides of the outlet of the fourth tread rubber inlet channel 34, thereby reducing the heat generation inside the shoulder 7. The angle between the lower bevel 39 and the bottom edge 35 is greater than 120°. The rear cross-sectional area of ​​the fourth tread rubber inlet channel 34 is greater than twice its front cross-sectional area, increasing the pressure of the fourth tread rubber at the outlet and improving the density of the fourth tread rubber.

[0054] The thickness of the connection between the second tread rubber inlet channel 32, the third tread rubber inlet channel 33 and the fourth tread rubber inlet channel 34 is less than 2 mm. The thinner thickness can reduce the height difference of the rubber materials exiting different outlets, and can be contacted and compounded at a faster speed.

[0055] Further, such as Fig.11 and Fig.12As shown, the extrusion flow channel 1 includes a first flow channel 11, a second flow channel 12, a third flow channel 13 and a fourth flow channel 14 from top to bottom, the first flow channel 11 is used to pass the third tread rubber, the second flow channel 12 is used to pass the first tread rubber, the third flow channel 13 is used to pass the second tread rubber, and the fourth flow channel 14 is used to pass the fourth tread rubber. The second flow channel 12 is gradually tightened from back to front, and two periscope channels 15 are formed on both sides of the first flow channel 11. The periscope channel 15 is a Z-shaped structure, and the front glue outlet of the periscope channel 15 extends to both sides of the front glue outlet of the second flow channel 12.

[0056] Further, such as Figure 8 and Fig. 9 As shown, the mouth box 4 is a rectangular body connecting the pre-mouth shape and the mouth plate 9, the trapezoidal opening 16 at the rear is the matching opening of the second pre-mouth shape 3, and the rectangular opening 17 at the front is the matching opening of the mouth plate 9, ensuring that the second pre-mouth shape 3 can be completely embedded in the mouth box 4, and the position of the second pre-mouth shape 3 is fixed by the upper and lower inclined surfaces and the wedge-shaped opening 18.

[0057] Further, such as Fig.10 As shown, since the groove depth and running surface of each tire are inconsistent, each tire needs to be equipped with a separate die plate 9. The die plate 9 is coplanar and embedded with the front rectangular opening 17 of the die box 4 to ensure that the position of the die plate 9 is fixed. A corresponding profile 19 is opened in the middle of the die plate 9, and the profile 19 can be replaced or adjusted according to the actual tire production.

[0058] A multi-composite tire tread extrusion method comprises the following steps:

[0059] S1, the extrusion flow channel 1 is fixedly installed on the extruder, the first pre-die 2 is inserted into the upper part of the second pre-die 3, and then the second pre-die 3 is embedded in the die box 4, the front side of the die box 4 is clamped with a die plate 9, and finally the die box 4 is fixedly installed on the extrusion flow channel 1;

[0060] S2, the first tread rubber enters the groove extrusion channel 22 along the second flow channel 12; the second tread rubber enters the second tread rubber inlet channel 32 along the third flow channel 13; the third tread rubber enters the third tread rubber inlet channel 33 along the first flow channel 11; the fourth tread rubber enters the fourth tread rubber inlet channel 34 along the fourth flow channel 14, and the multiple tread rubbers are extruded into corresponding shapes according to the specific shapes of the groove extrusion channel 22, the second tread rubber inlet channel 32, the third tread rubber inlet channel 33 and the fourth tread rubber inlet channel 34;

[0061] S3, the first tread rubber, the second tread rubber, the third tread rubber and the fourth tread rubber are extruded along the profile 19 on the die plate 9 to form a semi-finished tire tread.

[0062] In the description of the present invention, it is necessary to understand that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inside", "outside", "back", "middle", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0063] However, what is described above is only a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A multi-composite tire tread extrusion device, characterized in that: The invention comprises an extrusion flow channel (1), a first pre-die (2), a second pre-die (3) and a die box (4); the extrusion flow channel (1) is connected to an extruder; the first pre-die (2) is inserted into the upper part of the second pre-die (3) for extruding a tread groove (5); the second pre-die (3) is embedded in the die box (4); the extrusion flow channel (1) is connected to the die box (4); and a plurality of tread rubbers enter the first pre-die (2) and the second pre-die (3) through different channels of the extrusion flow channel (1).

2. A multi-composite tire tread extrusion device according to claim 1, characterized in that: The tread rubber comprises a first tread rubber, a second tread rubber, a third tread rubber and a fourth tread rubber, the first tread rubber enters the first pre-mouth mold (2), the second tread rubber, the third tread rubber and the fourth tread rubber all enter the second pre-mouth mold (3), and are respectively used to form a tread strip (6), a shoulder (7) and a lower tread (8), a plurality of the pattern grooves (5) are arranged at intervals on the tread strip (6), both sides of the tread strip (6) are the shoulders (7), and the bottom of the shoulder (7) and the tread strip (6) is the lower tread (8).

3. The multi-composite tire tread extrusion device according to claim 1, characterized in that: The first pre-mouth shape (2) comprises a glue inlet channel (21) and a plurality of groove extrusion channels (22); the glue inlet channel (21) is connected to the plurality of groove extrusion channels (22); and the bottom of the groove extrusion channel (22) is an isosceles trapezoid or a semicircular arc.

4. A multi-composite tire tread extrusion device according to claim 3, characterized in that: The bottom of the groove extrusion channel (22) is an isosceles trapezoid. The groove extrusion channel (22) comprises a bottom plate (221), two vertical plates (222) and two inclined plates (223). One end of the vertical plate (222) is fixedly installed at the glue outlet of the glue inlet channel (21), and the other end is fixedly connected to the inclined plate (223). The two vertical plates (222) are arranged in parallel, and the two inclined plates (223) are fixedly connected through the bottom plate (221). The angle between the inclined plate (223) and the bottom plate (221) is 120-150°, the angle between the inclined plate (223) and the vertical plate (222) is 120-150°, and the length of the inclined plate (223) is greater than 2 mm.

5. A multi-composite tire tread extrusion device according to claim 4, characterized in that: The bottom of the groove extrusion channel (22) is a semicircular arc, the vertical plate (222) and the bottom plate (221) are connected by an arc plate, the arc plate is tangent to the vertical plate (222) and the bottom plate (221) at the same time, and the radius of the arc plate is greater than 2 mm.

6. The multi-composite tire tread extrusion device according to claim 3, characterized in that: The glue inlet channel (21) is composed of an upper blocking plate (211), a lower blocking plate (212) and two side plates (213); the bottoms of the two side plates (213) are fixedly connected through the lower blocking plate (212); the upper blocking plate (211) is fixedly connected to the tops of the two side plates (213) and extends to the top of the groove extrusion channel (22); the vertical cross-section of the lower blocking plate (212) is a trapezoid; the thickness of the rear part of the trapezoid is greater than 5 mm and the thickness of the front part is less than 2 mm; the thickness of the front part of the upper blocking plate (211) is greater than 5 mm; the side plate (213) and the lower blocking plate (212) are transitioned by a fillet (214); the diameter of the fillet (214) is greater than 10 mm.

7. The multi-composite tire tread extrusion device according to claim 1, characterized in that: The second pre-mouth mold (3) comprises an insertion channel (31), a second tread rubber inlet channel (32), a third tread rubber inlet channel (33) and a fourth tread rubber inlet channel (34); the insertion channel (31) is adapted to be inserted into the first pre-mouth mold (2); the third tread rubber inlet channel (33) is arranged on both sides of the insertion channel (31); the second tread rubber inlet channel (32) is arranged below the insertion channel (31) and the third tread rubber inlet channel (33); and the fourth tread rubber inlet channel (34) is arranged below the second tread rubber inlet channel (32).

8. The multi-composite tire tread extrusion device according to claim 7, characterized in that: The bottom surface of the insertion channel (31) and the top surface of the second tread rubber inlet channel (32) are both inclined at a degree greater than 10°. The rear cross-sectional area of ​​the third tread rubber inlet channel (33) is greater than its front cross-sectional area. The front bottom edge (35) of the third tread rubber inlet channel (33) is connected to an upper oblique edge (36) close to the insertion channel (31). The top of the upper oblique edge (36) is connected to a vertical edge (37). The angles between the bottom edge (35) and the upper oblique edge (36), and between the upper oblique edge (36) and the vertical edge (37) are both greater than 120°. The rear cross-sectional area of ​​the second tread rubber inlet channel (32) is greater than twice its front cross-sectional area. The two sides of the outlet on the front side of the second tread rubber inlet channel (32) are acute angle structures extending outward. The top of the fourth tread rubber inlet channel (34) is an inwardly concave structure that is thick in the middle and thin at both sides.

9. The multi-composite tire tread extrusion device according to claim 2, characterized in that: The extrusion flow channel (1) comprises, from top to bottom, a first flow channel (11), a second flow channel (12), a third flow channel (13) and a fourth flow channel (14), wherein the first flow channel (11) is used for passing the third tread rubber, the second flow channel (12) is used for passing the first tread rubber, the third flow channel (13) is used for passing the second tread rubber, and the fourth flow channel (14) is used for passing the fourth tread rubber. The second flow channel (12) is gradually tightened from back to front, and two periscope channels (15) are formed on both sides of the first flow channel (11), and the periscope channels (15) are of a Z-shaped structure, and the front side glue outlet of the periscope channel (15) extends to both sides of the front side glue outlet of the second flow channel (12).

10. A multi-composite tire tread extrusion method, characterized in that: The steps include: S1, the extrusion flow channel (1) is fixedly installed on the extruder, the first pre-die (2) is inserted into the upper part of the second pre-die (3), and then the second pre-die (3) is embedded in the die box (4), the front side of the die box (4) is clamped with a die plate (9), and finally the die box (4) is fixedly installed on the extrusion flow channel (1); S2, the first tread rubber enters the groove extrusion channel (22) along the second flow channel (12); the second tread rubber enters the second tread rubber inlet channel (32) along the third flow channel (13); the third tread rubber enters the third tread rubber inlet channel (33) along the first flow channel (11); the fourth tread rubber enters the fourth tread rubber inlet channel (34) along the fourth flow channel (14); S3, the first tread rubber, the second tread rubber, the third tread rubber and the fourth tread rubber are extruded along the contour (19) on the die plate (9) to form a semi-finished tire tread.

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