Multi-composite tire tread extrusion device

Abstract

The utility model provides a multi-composite tire tread extrusion device, which comprises an extrusion runner, a first pre-die, a second pre-die and a die box, the extrusion runner is connected with an extruder, the first pre-die is inserted into the upper part of the second pre-die and is used for extruding a pattern groove, and the first pre-die and the second pre-die are integrally embedded into the die box after being matched. 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. The anti-eccentric wear performance of the shoulder is enhanced, and meanwhile, the type of the rubber material at the pattern groove is changed, so that the rubber material is distinguished from the rubber material at the tread strip part, the gnawing and chipping prevention performance of the pattern groove is further enhanced, and the service life of the low-rolling-resistance tire is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of tire manufacturing technology, and in particular to a multi-composite tire tread extrusion device. Background Technology

[0002] From bias-ply tires to radial tires, people have been constantly pursuing superior tire performance through continuous improvements in tire structure. Against the backdrop of global warming, green and sustainable development has become a new direction for tire development. In order to save energy, reduce emissions, and reduce the use of fossil fuels, the production of low rolling resistance tires has become a new direction in tire manufacturing.

[0003] Currently, although low rolling resistance tires on the market have fuel-saving characteristics, they have many limitations in use. They can generally only be used on good road conditions such as long-distance highways. Furthermore, they are prone to uneven wear on the shoulder and chipping of the tread grooves during use, often making them unusable in the later stages and affecting the tire's lifespan.

[0004] To address the issue of uneven wear on the shoulder, many tire manufacturers have opted to increase the amount of shoulder wing rubber to improve the tire's resistance to uneven wear. However, for the problem of tread groove chipping and breakage, it is often necessary to change the tread compound, which typically involves altering the entire tread compound. Replacing the entire tread compound significantly increases the company's R&D costs and prolongs the development cycle.

[0005] Currently, many companies focus on improving the anti-chipping and chipping performance of tread grooves by adding tread arcs to the edges of the grooves or using progressive steps. However, this approach can only solve the problem of chipping and chipping of some tread grooves in the early stages. If the road is rough or has gravel, large areas of chipping and chipping will still occur.

[0006] In the manufacturing process of tire treads, an extruder is used with an extrusion device to extrude rubber compound into a semi-finished tread. Most existing extrusion devices are general-purpose and cannot change the size of the shoulder, making it difficult to reduce uneven wear on the shoulder. They also cannot simultaneously extrude the tread grooves or adjust the type of rubber compound in the tread grooves, thus failing to further enhance the anti-eating and anti-chipping performance of the tread grooves. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of the aforementioned technologies and provide a multi-composite tire tread extrusion device.

[0008] Therefore, this utility model provides a multi-composite tire tread extrusion device, including an extrusion channel, a first pre-die, a second pre-die, and a die box. The extrusion channel is connected to an extruder. The first pre-die is inserted into the upper part of the second pre-die for extruding tread grooves. The second pre-die is embedded in the die box. The extrusion channel is connected to the die box. Multiple tread compounds enter the first pre-die and the second pre-die through different channels of the extrusion channel.

[0009] Preferably, the tread compound includes a first tread compound, a second tread compound, a third tread compound, and a fourth tread compound. The first tread compound enters the first pre-cut, and the second, third, and fourth tread compounds all enter the second pre-cut, respectively forming the tread strip, the shoulder, and the lower tread layer. The tread strip has multiple tread grooves spaced apart. The two sides of the tread strip form the shoulder, and the bottom of the shoulder and the tread strip form the lower tread layer.

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

[0011] Preferably, the bottom of the patterned groove extrusion channel is an isosceles trapezoid. The patterned groove extrusion channel includes a base plate, two vertical plates, and two inclined plates. One end of each vertical plate is fixedly installed at the outlet of the glue inlet channel, 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 to each other through the base plate. The angle between the inclined plate and the base plate is 120-150°, and the angle between the inclined plate and the vertical plate is 120-150°. The length of the inclined plate is greater than 2mm.

[0012] Preferably, the bottom of the patterned groove extrusion channel is a semi-circular arc, the vertical plate and the bottom plate are connected by an arc-shaped plate, the arc-shaped plate is tangent to both the vertical plate and the bottom plate, and the radius of the arc-shaped plate is greater than 2mm.

[0013] Preferably, the glue inlet channel consists of an upper sealing plate, a lower sealing plate, and two side plates. The bottoms of the two side plates are fixedly connected by 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 patterned groove extrusion channel. The vertical cross-section of the lower sealing plate is trapezoidal, with a rear thickness greater than 5mm and a front thickness less than 2mm. The front thickness of the upper sealing plate is greater than 5mm. The side plates and the lower sealing plate are transitioned by a rounded corner with a diameter greater than 10mm.

[0014] Preferably, the second pre-cut 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-cut. The third tread rubber inlet channels are provided on both sides of the insertion channel. The second tread rubber inlet channel is provided below the insertion channel and the third tread rubber inlet channel. The fourth tread rubber inlet channel is provided below the second tread rubber inlet channel.

[0015] Preferably, the bottom surface of the insertion channel and the top surface of the second tread glue inlet channel both have an inclination greater than 10°, the rear cross-sectional area of ​​the third tread glue inlet channel is larger than its front cross-sectional area, the front bottom edge of the third tread glue inlet channel is connected to the upper inclined edge near the insertion channel, the top of the upper inclined edge is connected to the vertical edge, the included angles between the bottom edge and the upper inclined edge, and between the upper inclined edge and the vertical edge are all greater than 120°, the rear cross-sectional area of ​​the second tread glue inlet channel is more than twice its front cross-sectional area, the two sides of the glue outlet on the front side of the second tread glue inlet channel are acute-angled structures extending outward, and the top of the fourth tread glue inlet channel is a concave structure that is thick in the middle and thin at both sides.

[0016] Preferably, the extrusion channels include, from top to bottom, a first channel, a second channel, a third channel, and a fourth channel. The first channel is used to pass through the third tread compound, the second channel is used to pass through the first tread compound, the third channel is used to pass through the second tread compound, and the fourth channel is used to pass through the fourth tread compound. The second channel gradually narrows from back to front. Two periscope channels are formed on both sides of the first channel. The periscope channels have a Z-shaped structure, and the front outlet of the periscope channel extends to both sides of the front outlet of the second channel.

[0017] The beneficial effects of this utility model are as follows: This utility model provides a multi-composite tire tread extrusion device, which has the following beneficial effects.

[0018] (1) Various tread compounds with different properties are sequentially extruded through an extrusion channel, a first pre-drill and a second pre-drill, a die box and a die plate. Under the action of the first pre-drill, the second pre-drill and the die box, the tread grooves, tread strips, shoulders and lower tread are extruded simultaneously, forming them as a single unit and enhancing the fit between the components. Then, according to the specific shape and size of the first pre-drill and the second pre-drill, a semi-finished tire tread with a similar density is extruded, thereby changing the size and shape of the shoulder and enhancing its anti-wear performance. At the same time, it also changes the type of rubber compound in the tread grooves, distinguishing it from the rubber compound in the tread strips, further enhancing the anti-chipping and chipping performance of the tread grooves and increasing the service life of low rolling resistance tires.

[0019] (2) By using a combination of tread rubbers to extrude semi-finished tire treads, there is no need to readjust the entire tread formula, which reduces the company's R&D costs. Existing tread rubbers can be directly used to produce low rolling resistance tire treads. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the back structure of the multi-composite tire tread extrusion device in this embodiment;

[0021] Figure 2 This is a schematic diagram of the front structure of the multi-composite tire tread extrusion device in this embodiment;

[0022] Figure 3 This is a schematic diagram of the structure of the first pre-cut in this embodiment;

[0023] Figure 4 This is a schematic diagram of the pattern groove extrusion channel in this embodiment;

[0024] Figure 5 This is a schematic diagram of the structure of the lower sealing plate of the first pre-orifice in this embodiment;

[0025] Figure 6 This is a schematic diagram of the structure of the second pre-orifice in this embodiment;

[0026] Figure 7 This is a schematic diagram of the back structure of the second pre-mouth in this embodiment;

[0027] Figure 8 This is a schematic diagram of the back structure of the mouth-shaped box in this embodiment;

[0028] Figure 9 This is a schematic diagram of the front structure of the mouth-shaped box in this embodiment;

[0029] Figure 10 This is a schematic diagram of the mouthpiece plate in this embodiment;

[0030] Figure 11 This is a schematic diagram of the back structure of the extrusion channel in this embodiment;

[0031] Figure 12 This is a schematic diagram of the front structure of the extrusion channel in this embodiment;

[0032] Figure 13 This is a schematic diagram of the structure of the semi-finished tire tread extruded from the four types of tread rubber in this embodiment.

[0033] The diagram shows the following markings: 1. Extrusion channel; 11. First channel; 12. Second channel; 13. Third channel; 14. Fourth channel; 15. Periscope channel; 2. First pre-nozzle; 21. Inlet channel one; 211. Upper sealing plate; 212. Lower sealing plate; 213. Side plate; 214. Rounded corner one; 22. Patterned groove extrusion channel; 221. Bottom plate; 222. Vertical plate; 223. Inclined plate; 3. Second pre-nozzle; 31. 32. Insertion channel; 33. Second tread rubber inlet channel; 34. Third tread rubber inlet channel; 35. Fourth tread rubber inlet channel; 36. Bottom edge; 37. Upper bevel edge; 38. Vertical edge; 39. Rounded corner II; 4. Lower bevel edge; 5. Tread groove; 6. Tread surface; 7. Shoulder; 8. Lower tread layer; 9. Bevel plate; 10. Bottom edge; 16. Trapezoidal opening; 17. Rectangular opening; 18. Wedge-shaped opening; 19. Outline. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0035] Example:

[0036] like Figures 1 to 13 As shown, this utility model provides a multi-composite tire tread extrusion device, including an extrusion channel 1, a first pre-die 2, a second pre-die 3, and a die box 4. The extrusion channel 1 is connected to an extruder. The first pre-die 2 is inserted downwards into the upper part of the second pre-die 3 for extruding tread grooves 5. In actual production, 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 channel 1 is connected to the die box 4. Multiple tread rubbers enter the first pre-die 2 and the second pre-die 3 through different channels of the extrusion channel 1.

[0037] Furthermore, the tread compound includes a first tread compound, a second tread compound, a third tread compound, and a fourth tread compound. The first tread compound is a high-hardness tread compound that is puncture-resistant and tear-resistant. The second tread compound has low hysteresis loss. The third tread compound is wear-resistant, puncture-resistant, and has good heat dissipation. The fourth tread compound reduces heat generation. The first tread compound enters the first pre-cut 2, and the second, third, and fourth tread compounds all enter the second pre-cut 3, respectively used to form the tread strip 6, the shoulder 7, and the lower tread layer 8. Figure 13As shown, the tire tread 6 is provided with a plurality of tread grooves 5 at intervals, and the plurality of tread grooves 5 divide the tire tread into a plurality of circumferential tire treads 6. The two sides of the tire tread 6 are the shoulders 7, the shoulders 7 are roughly right-angled trapezoids, and the shoulders 7 and the bottom of the tire tread 6 are the lower tire tread 8.

[0038] Different types of tread compounds typically possess good elasticity, toughness, tensile strength, ductility, and heat-induced flowability. However, due to these differences in properties, the hardness and density of the extruded compound vary. To ensure a tight bond between different compounds and consistent density across different locations, the distances between the inflection points of the surfaces flowing through extrusion channel 1 to the various areas of the pre-drilled pattern should be relatively uniform. Therefore, the dimensions at the inflection point connections between the surfaces of the first and second pre-drilled patterns must meet the corresponding dimensional parameter requirements. Limiting these dimensional parameters can reduce the formation of air pockets at the joints during the initial compounding process, increase the contact area between the compounds, and improve the overall tire yield and durability.

[0039] The specific dimensional parameters of the first pre-flute 2 and the second pre-flute 3 are as follows:

[0040] The number of tread grooves 5 is generally 1-6. The width and depth of the tread grooves 5 are related to the tire's operating environment, with a width generally of 2-30mm and a depth of 5-30mm. In this embodiment, the number of tread grooves 5 is four.

[0041] Furthermore, such as Figures 3 to 5 As shown, the first pre-groove type 2 includes a glue inlet channel 21 and four tread groove extrusion channels 22. The glue inlet channel 21 is connected to the four tread groove extrusion channels 22. The inlet area of ​​the glue inlet channel 21 is much larger than the extrusion area of ​​the tread groove extrusion channels 22, thereby increasing the glue outlet pressure of the tread groove extrusion channels 22 and making the density of the first tread rubber higher when extruded. The upper width of the tread groove extrusion channel 22 is 1-3 mm wider on each side than the designed width of the tread groove 5, and the depth is 1-3 mm deeper than the designed depth of the tread groove 5, so as to ensure that the groove wall and bottom of the tread groove 5 are covered with the first tread rubber. The bottom of the tread groove extrusion channel 22 is an isosceles trapezoid or a semi-circular arc.

[0042] Furthermore, the bottom of the patterned groove extrusion channel 22 is an isosceles trapezoid. The patterned groove extrusion channel 22 includes a base plate 221, two vertical plates 222, and two inclined plates 223. One end of the vertical plate 222 is fixedly installed at the 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 to each other through the base plate 221. The angle between the inclined plate 223 and the base plate 221 is 120-150°, and the angle between the inclined plate 223 and the vertical plate 222 is 120-150°. The length of the inclined plate 223 is greater than 2mm.

[0043] Furthermore, the bottom of the patterned groove extrusion channel 22 can also be a semi-circular arc, the vertical plate 222 and the bottom plate 221 are connected by an arc plate, the arc plate is tangent to both the vertical plate 222 and the bottom plate 221, and the radius of the arc plate is greater than 2mm.

[0044] Furthermore, the glue inlet channel 21 is composed of an upper sealing plate 211, a lower sealing plate 212, and two side plates 213. The bottoms of the two side plates 213 are fixedly connected to the lower sealing plate 212. The upper sealing plate 211 is fixedly connected to the tops of the two side plates 213 and extends to the top of the patterned groove extrusion channel 22. The vertical cross-section of the lower sealing plate 212 is trapezoidal. The thickness of the rear part of the trapezoid is greater than 5mm, and the thickness of the front part is less than 2mm. The thickness of the rear part can maintain the overall rigidity of the first pre-orifice 2, and the thinness of the front part can... The height difference between the upper and lower adhesive materials at the dispensing port is small, allowing for rapid contact and bonding. The thickness of the front part of the upper sealing plate 211 is greater than 5mm. The side plate 213 and the lower sealing plate 212 are connected by a rounded corner 214 with a diameter greater than 10mm. The rounded corner 214 ensures that the first pre-groove 2 can be smoothly installed on the second pre-groove 3, preventing the edges from colliding and causing uneven fit. The width of the side plate 213 is 15-25mm, thus ensuring the overall rigidity of the first pre-groove 2.

[0045] Furthermore, such as Figure 6 and Figure 7 As shown, the second pre-cut 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-cut 2. The third tread rubber inlet channel 33 is provided on both sides of the insertion channel 31. The second tread rubber inlet channel 32 is provided below the insertion channel 31 and the third tread rubber inlet channel 33. The fourth tread rubber inlet channel 34 is provided below the second tread rubber inlet channel 32.

[0046] Furthermore, the bottom surface of the insertion channel 31 and the top surface of the second tread adhesive inlet channel 32 are both inclined at more than 10° to enhance the contact pressure during adhesive compounding.

[0047] The rear cross-sectional area of ​​the third tread adhesive inlet channel 33 is larger than its front cross-sectional area, which facilitates increasing the adhesive pressure at the outlet of the third tread adhesive by reducing the cross-sectional area, thereby increasing the adhesive density. The bottom edge 35 of the front side of the third tread adhesive inlet channel 33 is connected to the upper inclined edge 36 near the insertion channel 31. The top of the upper inclined edge 36 is connected to the vertical edge 37. The included angles between the bottom edge 35 and the upper inclined edge 36, and between the upper inclined edge 36 and the vertical edge 37, are all greater than 120°. The vertical edge 37 and the upper inclined edge 36 are transitioned by a rounded corner 38, so that the difference in the flow radius of the third tread adhesive in the third tread adhesive inlet channel 33 is small, reducing the air holes at the adhesive joint and preventing corner jamming.

[0048] The rear cross-sectional area of ​​the second tread rubber inlet channel 32 is more than twice the front cross-sectional area, which increases the pressure at the outlet and facilitates the extrusion of the second tread rubber after compression. The two sides of the outlet on the front side of the second tread rubber inlet channel 32 are acute-angled structures extending outward, which defines the extrusion shape and size of the third and fourth tread rubbers.

[0049] The top of the fourth tread adhesive inlet channel 34 is a concave structure that is thicker in the middle and thinner at both sides. The fourth tread adhesive inlet channel 34 is arranged obliquely from bottom to top with an inclination angle greater than 12°. The concave structure consists of a bottom edge 35, a lower oblique edge 39, and the lower edge 10 of the second tread adhesive inlet channel 32. The lower oblique edge 39 is fixedly installed on both sides of the lower edge 10, and the bottom edge 35 is fixedly installed on both sides of the lower oblique edge 39, so that the interface is uniform and the thickness of the two sides of the outlet of the fourth tread adhesive inlet channel 34 is increased, thereby reducing the heat generation inside the shoulder 7. The angle between the lower oblique edge 39 and the bottom edge 35 is greater than 120°. The cross-sectional area of ​​the rear part of the fourth tread adhesive inlet channel 34 is more than twice the cross-sectional area of ​​its front part, increasing the pressure of the fourth tread adhesive at the outlet and increasing the density of the fourth tread adhesive.

[0050] The thickness at the connection point of the outlets of 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 2mm. The thinner thickness allows for a smaller height difference of the rubber material at different outlets, enabling faster contact and bonding.

[0051] Furthermore, such as Figure 11 and Figure 12As shown, the extrusion channel 1 includes, from top to bottom, a first channel 11, a second channel 12, a third channel 13, and a fourth channel 14. The first channel 11 is used to pass through the third tread compound, the second channel 12 is used to pass through the first tread compound, the third channel 13 is used to pass through the second tread compound, and the fourth channel 14 is used to pass through the fourth tread compound. The second channel 12 gradually tightens from back to front. Two periscope channels 15 are formed on both sides of the first channel 11. The periscope channels 15 have a Z-shaped structure, and the front outlet of the periscope channel 15 extends to both sides of the front outlet of the second channel 12.

[0052] Furthermore, such as Figure 8 and Figure 9 As shown, the lip box 4 is a rectangular body that connects the pre-lip and the lip plate 9. The trapezoidal opening 16 at the rear is the mating opening of the second pre-lip 3, and the rectangular opening 17 at the front is the mating opening of the lip plate 9, ensuring that the second pre-lip 3 can be completely embedded in the lip box 4. The position of the second pre-lip 3 is fixed by the upper and lower inclined surfaces and the wedge-shaped opening 18.

[0053] Furthermore, such as Figure 10 As shown, because the groove depth and driving surface of each tire are different, each tire needs to be equipped with a separate bead plate 9. The bead plate 9 is coplanar with and embedded in the rectangular opening 17 at the front of the bead box 4 to ensure that the position of the bead plate 9 is fixed. A corresponding contour 19 is opened in the middle of the bead plate 9. The contour 19 can be replaced or adjusted according to the actual tire production.

[0054] A method for extruding a multi-composite tire tread includes the following steps:

[0055] S1. Fix the extrusion channel 1 on the extruder, insert the first pre-die 2 into the upper part of the second pre-die 3, then embed the second pre-die 3 into the die box 4. The front side of the die box 4 is snapped with the die plate 9. Finally, fix the die box 4 on the extrusion channel 1.

[0056] S2, the first tread compound enters the tread groove extrusion channel 22 along the second flow channel 12; the second tread compound enters the second tread compound inlet channel 32 along the third flow channel 13; the third tread compound enters the third tread compound inlet channel 33 along the first flow channel 11; the fourth tread compound enters the fourth tread compound inlet channel 34 along the fourth flow channel 14. The various tread compounds are extruded into corresponding shapes according to the specific shapes of the tread groove extrusion channel 22, the second tread compound inlet channel 32, the third tread compound inlet channel 33, and the fourth tread compound inlet channel 34.

[0057] S3, the first tread compound, the second tread compound, the third tread compound and the fourth tread compound are extruded along the contour 19 on the die plate 9 to form a semi-finished tire tread.

[0058] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0059] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

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

2. A multi-composite tire tread extrusion apparatus as defined in claim 1, wherein, 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-die (2), the second tread rubber, the third tread rubber and the fourth tread rubber all enter the second pre-die (3) for forming a tread strip (6), a shoulder (7) and an underlayer tread (8), respectively, multiple grooves (5) are arranged on the tread strip (6) at intervals, the two sides of the tread strip (6) are the shoulder (7), and the bottom of the shoulder (7) and the tread strip (6) is the underlayer tread (8).

3. A multi-composite tire tread extrusion apparatus as defined in claim 1, wherein, The first pre-die (2) comprises a first rubber inlet channel (21) and multiple groove extrusion channels (22), the first rubber inlet channel (21) is communicated with the multiple groove extrusion channels (22), and the bottom of the groove extrusion channel (22) is isosceles trapezoidal or semicircular.

4. A multi-composite tire tread extrusion apparatus as defined in claim 3, wherein, The bottom of the groove extrusion channel (22) is isosceles trapezoidal, 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 rubber outlet of the first rubber inlet channel (21), the other end is fixedly connected with the inclined plate (223), the two vertical plates (222) are arranged in parallel, 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 apparatus as defined in claim 4, wherein, The bottom of the groove extrusion channel (22) is semicircular, the vertical plate (222) and the bottom plate (221) are connected through an arc-shaped plate, the arc-shaped plate is tangent to the vertical plate (222) and the bottom plate (221) at the same time, and the radius of the arc-shaped plate is greater than 2 mm.

6. A multi-composite tire tread extrusion apparatus as defined in claim 3, wherein, The first glue feeding channel (21) is composed of an upper blocking plate (211), a lower blocking plate (212) and two side plates (213), the bottom of the two side plates (213) is fixedly connected through the lower blocking plate (212), the upper blocking plate (211) is fixedly connected with the top of the two side plates (213) and extends to the top of the pattern groove extrusion channel (22), the vertical section of the lower blocking plate (212) is trapezoidal, the thickness of the rear part of the trapezoid is greater than 5mm, the thickness of the front part is less than 2mm, the thickness of the front part of the upper blocking plate (211) is greater than 5mm, the side plate (213) and the lower blocking plate (212) are transitioned through a round corner (214), the diameter of the round corner (214) is greater than 10mm.

7. A multi-composite tire tread extrusion apparatus as defined in claim 1, wherein, The second pre-die (3) comprises an insertion channel (31), a second tread rubber glue feeding channel (32), a third tread rubber glue feeding channel (33) and a fourth tread rubber glue feeding channel (34), the insertion channel (31) is adapted to be inserted into the first pre-die (2), the two sides of the insertion channel (31) are provided with the third tread rubber glue feeding channel (33), the lower part of the insertion channel (31) and the third tread rubber glue feeding channel (33) is provided with the second tread rubber glue feeding channel (32), and the lower part of the second tread rubber glue feeding channel (32) is provided with the fourth tread rubber glue feeding channel (34).

8. A multi-composite tire tread extrusion apparatus as defined in claim 7, wherein, The inclination of the bottom surface of the insertion channel (31) and the top surface of the second tread rubber glue feeding channel (32) is greater than 10°, the rear cross-sectional area of the third tread rubber glue feeding channel (33) is greater than the front cross-sectional area, the front side bottom edge (35) of the third tread rubber glue feeding channel (33) is connected with the upper inclined edge (36) close to the insertion channel (31), the top of the upper inclined edge (36) is connected with the vertical edge (37), the included angle between the bottom edge (35) and the upper inclined edge (36) and the upper inclined edge (36) and the vertical edge (37) is greater than 120°, the rear cross-sectional area of the second tread rubber glue feeding channel (32) is greater than 2 times of the front cross-sectional area, the two sides of the glue outlet of the front side of the second tread rubber glue feeding channel (32) are outwardly extending acute angle structures, and the top of the fourth tread rubber glue feeding channel (34) is a concave structure with thick middle and thin two sides.

9. A multi-composite tire tread extrusion apparatus as defined in claim 2, wherein, The extrusion flow channel (1) sequentially comprises 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 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, two periscopic channels (15) are formed on the two sides of the first flow channel (11), the periscopic channels (15) are Z-shaped structures, and the front side glue outlet of the periscopic channels (15) extends to the two sides of the front side glue outlet of the second flow channel (12).

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