A single drum extruder head for tire tread molding

Abstract

The present application relates to the technical field of tire manufacturing equipment, in particular to a single roller extruder head for tire tread molding, comprising a machine body, a die body assembly and a roller, the front and rear sides of the machine body are respectively provided with an inlet and an outlet for the rubber material to enter; the die body assembly comprises an upper die and a lower die which can be relatively closed, the upper die is movably installed on the machine body, and the inlet and the outlet are respectively arranged on the front and rear sides of the region between the upper die and the lower die. The present application combines the inclined discharge channel with the increasing width gradient to naturally eliminate the flow rate difference of the rubber material during the flow process, thereby reducing the edge cracking problem of the tire tread, and the shunt effect of the stop block guides the rubber material to the first channel and the second channel, avoiding local overload of the roller, while avoiding secondary processing of the rubber material, so as to directly form the rubber surface with different planes on both sides.

Description

Technical Field

[0001] This invention relates to the field of tire manufacturing equipment technology, and specifically to a single-roller extruder head for tire tread forming. Background Technology

[0002] In the field of tire tread extrusion molding, the single-roll extruder die head is a core production piece, and its flow channel design and mold clamping structure directly affect tread quality and production efficiency. Traditional twin-roll structures have been gradually replaced by single-roll structures due to high energy consumption and complex maintenance. However, existing single-roll technology still has significant drawbacks, which can be summarized into the following three major technical bottlenecks. First, there are problems with uneven rubber distribution and pressure runaway. In traditional single-roll die heads, the rubber flow at the feed port directly impacts the roller, resulting in significant differences in flow velocity in the width direction of the discharge. Second, due to structural design defects, rubber stagnation zones are easily formed at the junction of the discharge port and the roller, requiring frequent shutdowns for cleaning.

[0003] Existing technology, such as the Chinese utility model patent with publication number CN2543695Y and patent name "L" type single roller die head, specifically discloses an "L" type single roller die head for an extruder equipped with a pin-type cold feed extruder using an extrusion process. It is axially fixedly connected to the extruder barrel and includes a support device, die head structure, flow channel structure, roller assembly, and flange, etc. Its advantages are: simple operation, safety, convenience, and reliability. A channel is provided at the junction of the lower die head body and the roller to reduce the die head pressure to atmospheric pressure, resulting in a low die expansion rate due to the low pressure.

[0004] The above solution yields dimensionally accurate semi-finished products and low extrusion temperatures, which maintain high product quality. It features a simple die, enabling the extrusion of semi-finished products with varying thicknesses, precise thickness control, energy savings, reduced production costs, and increased production flexibility.

[0005] However, in practice, because the rubber flow at the feed inlet of the traditional single-roller die head directly impacts the roller, the flow velocity difference in the width direction of the discharge is significant. Although the above solution reduces the die expansion rate through the pressure reduction channel at the junction of the lower die head body and the roller, this design only optimizes the pressure release and does not solve the problem of rubber diffusion in the initial stage of feeding. In actual application, uneven distribution of rubber in the flow channel will still cause cracking at the tread edge and thickness fluctuations exceeding the industry allowable range.

[0006] To address these issues, we propose a single-roller extruder head for tire tread forming. Summary of the Invention

[0007] Technical problems to be solved To address the aforementioned shortcomings of existing technologies, this invention provides a single-roller extruder head for tire tread forming, which can solve the problem that uneven distribution of rubber material inside the flow channel still leads to tread edge cracking and thickness fluctuations in existing technologies.

[0008] Technical solution To achieve the above objectives, the present invention provides the following technical solution: This invention provides a single-roller extruder head and body for tire tread forming, wherein the front and rear sides of the body are respectively provided with an inlet and an outlet for rubber material entry. The mold assembly includes an upper mold and a lower mold that can be closed relative to each other. The upper mold is movably mounted on the machine body. The inlet and outlet are respectively located on the front and rear sides of the area between the upper mold and the lower mold. A roller, which is rotatably mounted on the machine body and is located at the front end of the discharge port and rotates synchronously with the rubber material as it is extruded from the discharge port; The lower mold has an upwardly inclined discharge channel near the inlet, which connects the inlet and outlet. The width of the discharge channel gradually increases from one side of the inlet, and a stop is provided on the side of the discharge channel near the outlet. The outlet is divided into a first channel and a second channel. The first channel is the area between the two inclined sides of the stop and the adjacent side of the discharge channel. The second channel is the area between the upper end of the stop and the upper mold.

[0009] Furthermore, the cross-section of the block is in the shape of an isosceles trapezoid, and the two sides of its inclined sides are inclined towards the center.

[0010] Furthermore, a multi-axis pressure relief plate is provided on each side of the stop block. The multi-axis pressure relief plate includes a guide plate that is elastically hinged to the lower mold and a flow divider that is elastically hinged to the guide plate. The guide plate can rotate toward the feed port side, and the flow divider can rotate toward the stop block side.

[0011] Furthermore, an arc-shaped guide groove is formed on the lower mold along the rotation trajectory of the guide plate, and the lower end of the guide plate slides in a guide-sliding engagement with the guide groove.

[0012] Furthermore, the diameter of the discharge channel gradually decreases towards the side of the roller.

[0013] Furthermore, a transition section is provided at the discharge port along the axial direction of the roller, the transition section being inclined toward one side of the roller and tangent to the outer end face of the roller.

[0014] Furthermore, at least one converging ridge is provided at each of the two discharge ports in the first channel. The cross-section of the converging ridge is generally wavy, with a convex center and concave sides in the width direction.

[0015] Furthermore, the middle part of the lower mold rises from both sides towards the center, and the feed port is directly opposite the middle rise of the lower mold.

[0016] Furthermore, the height of the roller and the distance between it and the upper and lower dies are adjustable.

[0017] Furthermore, the machine body is provided with a locking mechanism for locking the upper mold, the upper mold is provided with a locking hole, and the locking mechanism includes a rotating shaft hammer that can be inserted into the locking hole.

[0018] Beneficial effects The technical solution provided by this invention has the following advantages compared with the prior art: This invention uses an inclined discharge channel combined with an increased width gradient to naturally eliminate flow velocity differences in the rubber material during flow, thereby reducing the problem of tread edge cracking. Furthermore, the flow diversion effect of the baffle guides the rubber material to the first and second channels, avoiding local overload of the rollers. At the same time, it can avoid secondary processing of the rubber material, thus directly forming a rubber surface with different heights on both sides. The rotation of the rollers allows for synchronous extrusion with the rubber compound, significantly reducing the frictional resistance between the rubber compound and the rollers, thus improving surface quality while ensuring pressure release. By setting a horizontal transition section between the discharge port and the roller, the right-angle step in the traditional design is eliminated. The edge of the upper mold facing the roller is rounded, so that the gap between the apex of the arc and the roller is smaller than the gap of the transition section, forming a guide slope for the rubber material and reducing the amount of rubber accumulation near the discharge port. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the machine head in an embodiment of the present invention; Figure 2 This is a top view of the overall structure in an embodiment of the present invention; Figure 3 This is a bottom view of the upper mold structure in an embodiment of the present invention; Figure 4 This is a partial cross-sectional view of the overall structure in an embodiment of the present invention; Figure 5 This is a top view of the lower mold structure in an embodiment of the present invention; Figure 6 This is a side view of the overall structure of the machine head in an embodiment of the present invention; Figure 7 As described in the embodiments of the present invention Figure 6 Schematic diagram of the structure at point A in the middle; Figure 8 This is a schematic diagram of the lower mold side view structure in an embodiment of the present invention; Figure 9 As described in the embodiments of the present invention Figure 8 Schematic diagram of the structure at point B; Figure 10 This is a schematic diagram of the discharge port structure in an embodiment of the present invention.

[0021] The labels in the diagram represent: 1. Machine body; 10. Inlet; 11. Outlet; 111. First channel; 112. Second channel; 113. Transition section; 114. Converging ridge; 12. Rotating shaft hammer; 2. Mold assembly; 21. Upper mold; 211. Locking hole; 212. Locking step; 22. Lower mold; 221. Outlet channel; 222. Stop block; 223. Multi-axis pressure relief plate; 2231. Guide plate; 2232. Diverter plate; 224. Guide groove; 3. Roller. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0023] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0026] The present invention will be further described below with reference to embodiments.

[0027] Example: Please refer to Figures 1 to 10 The present invention provides a single-roller extruder head for tire tread forming, comprising a machine body 1, a die assembly 2 and a roller 3.

[0028] The main body 1, as the basic support structure of the entire head, is integrally cast from high-strength cast iron material, and has good rigidity and vibration resistance.

[0029] The front and rear sides of the machine body 1 are respectively provided with an inlet 10 for rubber material to enter and an outlet 11 for rubber material to be extruded.

[0030] The feed inlet 10 is rigidly connected to the barrel at the end of the extruder screw via a flange structure, ensuring that the rubber material can be stably injected into the die head under the continuous propulsion of the screw. The top of the machine body 1 is integrated with an independent hydraulic station, which is connected to each actuator through a high-pressure oil pipe, providing a unified power source for all hydraulic drive components and realizing coordinated control of each action.

[0031] The mold assembly 2 includes an upper mold 21 and a lower mold 22 that can be closed relative to each other. The upper mold 21 is movably mounted on the machine body 1. Specifically, the upper mold 21 slides with the guide rail on the top of the machine body 1 through hinge mechanisms arranged symmetrically on both sides, and is driven to rise and fall vertically by the upper mold opening cylinder.

[0032] The upper mold opening cylinder is a double-acting hydraulic cylinder. Its cylinder body is fixed on the machine body 1, and the piston rod end is connected to the upper mold 21. The extension and retraction of the piston rod are controlled by the hydraulic reversing valve to realize the opening and closing of the upper mold 21. The lower mold 22 is precisely aligned with the reference surface of the machine body 1 through multiple positioning pins and is fixed with bolts to ensure accurate alignment with the upper mold 21 during the mold closing process.

[0033] When the upper mold 21 and the lower mold 22 are closed, a closed material flow channel space is formed between them, with the inlet 10 and the outlet 11 located at the front and rear ends of the space, respectively.

[0034] Roller 3 is rotatably mounted on machine body 1 and located at the front end of discharge port 11. Roller 3 is made of high-quality alloy steel and its outer surface is hard chrome plated with a thickness of not less than 0.05mm to improve wear resistance and surface finish.

[0035] The roller 3 is rotatably mounted in the bearing housing at the front end of the machine body 1 by means of double-row tapered roller bearings arranged symmetrically at both ends. The bearing housing is provided with lubrication oil channels, and grease is injected periodically to ensure the flexibility of the roller 3 rotation.

[0036] The axis of roller 3 is arranged perpendicularly to the center line of outlet 11 in space. When the rubber is extruded from outlet 11, the forward movement of the rubber drives roller 3 to rotate passively. That is, roller 3 rotates synchronously with the rubber as it is extruded from outlet 11.

[0037] To further optimize synchronization performance, roller 3 is connected to a drive cylinder via a universal joint. This drive cylinder is equipped with a proportional flow valve and a speed sensor, which can adjust the rotation speed of roller 3 in real time according to the change in rubber extrusion speed, so that the surface linear velocity of roller 3 is slightly higher than the rubber extrusion speed, thereby significantly reducing the frictional resistance between rubber and roller 3 and improving the surface smoothness of the tire tread.

[0038] A discharge channel 221 is provided on the lower mold 22 near the inlet 10, which is inclined upward and connects the inlet 10 and the outlet 11. The discharge channel 221 extends upward at a 30° angle from the beginning of the inlet 10 to the end of the outlet 11, and its width gradually increases from one side of the inlet 10, forming a gradient widening structure.

[0039] The widening of the flow channel reduces the wall resistance of the rubber compound in the central area, while the rubber compound in the edge area is slowed down, thus naturally eliminating the flow velocity difference during the flow process and avoiding the problem of tread edge cracking caused by uneven flow velocity.

[0040] A stop 222 is provided on the side of the discharge channel 221 near the discharge port 11. The stop 222 is made of tool steel and is detachably installed on the lower mold 22 by countersunk screws. The discharge port 11 is divided into a first channel 111 and a second channel 112 by the stop 222: the first channel 111 is the area between the two inclined sides of the stop 222 and the adjacent side of the discharge channel 221; the second channel 112 is the area between the upper end of the stop 222 and the upper mold 21.

[0041] The cross-section of the stop block 222 is an isosceles trapezoid, and its two inclined sides are sloping towards the center to avoid dead zones in the rubber flow and ensure smooth distribution of the rubber material. The stop block 222 evenly guides the rubber material to the first channel 111 and the second channel 112, where the first channel 111 forms the thick rubber area at the edge of the tread, and the second channel 112 forms the thin rubber area at the crown, thus directly forming the different planes with varying heights on both sides of the tire tread as required, without secondary processing, avoiding repeated heating and molding processes of the rubber material.

[0042] To further optimize the stability of the rubber flow and pressure release, a multi-axis pressure relief plate 223 is provided on both sides of the stop block 222. The multi-axis pressure relief plate 223 includes a guide plate 2231 elastically hinged to the lower mold 22 and a diverter plate 2232 elastically hinged to the guide plate 2231. The lower end of the guide plate 2231 is hinged to the lower mold 22 by a pin and is equipped with a torsion spring so that it maintains a certain preload in the direction of the feed port 10 in its natural state and can rotate in the direction of the feed port 10. The upper end of the splitter plate 2232 is hinged to the upper end of the guide plate 2231 via a miniature pin, and is also equipped with a torsion spring so that it can rotate toward the side of the stop block 222.

[0043] An arc-shaped guide groove 224 is provided on the upper part of the lower mold 22 along the rotation trajectory of the guide plate 2231. The lower end of the guide plate 2231 extends into the guide groove 224 and slides with it to provide a stable movement trajectory for the guide plate 2231. It should be noted that when the guide plate 2231 is pushed to the limit position by the rubber material, the continuous high pressure will cause the diversion plate 2232 to flip, guiding part of the rubber material to the second channel 112.

[0044] When the pressure of the rubber compound fluctuates, the guide plate 2231 and the diverter plate 2232 can adaptively adjust their angles according to the changes in the rubber compound pressure to achieve dynamic pressure relief and diversion, thus avoiding rubber splashing or uneven extrusion thickness caused by sudden pressure changes.

[0045] The diameter of the discharge channel 221 gradually decreases in the direction of the roller 3, forming a shrinkage section, which further compresses and densifies the rubber material at the outlet, improving the density of the extrudate. A transition section 113 is provided at the discharge port 11, extending horizontally along the axial direction of the roller 3. The transition section 113 is inclined towards the roller 3 and tangent to the outer end face of the roller 3, eliminating the right-angle step structure in the traditional design.

[0046] The edge of the upper die 21 facing the roller 3 is rounded, and the gap between the apex of the arc and the outer end face of the roller 3 is smaller than the gap between other parts of the upper die 21 and the transition section 113, thus forming a continuous and smooth rubber guide slope, which effectively reduces the amount of rubber accumulated at the outlet and reduces the frequency of shutdown cleaning.

[0047] At least one confluence ridge 114 is provided at each of the two discharge ports 11 in the first channel 111. The cross-section of the confluence ridge 114 is generally wavy, with a convex center and concave sides in the width direction, so that the rubber material can be evenly distributed in the thickness direction during the confluence process, further improving the molding quality of the tread edge and avoiding delamination or bubble defects caused by uneven rubber material confluence.

[0048] The lower mold 22 rises from both sides towards the center, forming an approximately arc-shaped structure. The inlet 10 is directly opposite the center of the lower mold 22, so that the rubber material can spread evenly to both sides along the arc when it enters the die head, avoiding the rubber material from concentrating and impacting a certain area, and ensuring the initial uniformity of the rubber material distribution in the width direction of the flow channel.

[0049] The height of roller 3 and its distance from the upper die 21 and lower die 22 are adjustable. Specifically, the bearing seats at both ends of roller 3 are mounted on an adjustment mechanism with a precision trapezoidal screw. The operator can adjust the trapezoidal screw by rotating the handwheel or by electric drive, causing the bearing seats to move up and down along the vertical guide rail, thereby precisely adjusting the position of roller 3 to meet the production requirements of different tire tread thicknesses. After adjustment, the roller 3 is fixed by tightening the lock nut to ensure its stable position during operation.

[0050] The machine body 1 is equipped with a locking mechanism for locking the upper mold 21. The upper mold 21 is provided with a locking hole 211, and two symmetrically distributed locking steps 212 are provided in the middle of the locking hole 211, forming an oblong hole structure. The locking mechanism includes a rotating shaft hammer 12 that can be inserted into the locking hole 211, as well as upper and lower mold locking cylinders and guide sleeves connected thereto.

[0051] In the initial state of the machine head, the safety hook cylinder in the safety hook assembly extends forward, and the safety hook hooks the upper mold 21 to prevent it from falling and ensure operational safety; the piston of the upper and lower mold locking cylinder is in the lower position, and the rotating shaft hammer 12 is aligned with the oval hole on the upper mold 21. The rotating shaft hammer 12 can fall into the oval hole, and the two do not interfere with each other.

[0052] When the mold closing begins, the safety hook cylinder retracts, disengaging the safety hook from the upper mold 21; the upper mold opening cylinder extends forward, driving the upper mold 21 to fall vertically; the rotating shaft hammer 12 passes through the oval hole on the upper mold 21, and after the sensor detects its position, the pistons of the upper and lower mold locking cylinders move upward, causing the rotating shaft hammer 12 to pass completely through the oval hole; subsequently, under the guidance of the guide sleeve and the rotating groove on the rotating shaft hammer, the rotating shaft hammer 12 rotates 90° and engages with the oval hole; the upper mold opening cylinder pulls down, locking the rotating shaft hammer 12 with the oval hole of the upper mold 21, and the upper and lower mold locking cylinders maintain pressure, achieving reliable locking of the upper mold 21.

[0053] When the upper and lower die locking cylinders detect the set locking pressure, the die plate locking cylinder in the insert plate assembly is in the upper position, and the comb die plate is in the upper position. The operator can then insert the die plate corresponding to the product to be extruded. Subsequently, the die plate locking cylinder drives the comb die plate to move down and press the die plate to ensure that the bottom of the die plate matches the bottom roller drag head part.

[0054] At this point, start the extruder screw and the bottom roller of the die head to drag the die head part, and the corresponding specification of molding compound can be extruded. When it is necessary to open the die head to clean the compound or replace the flow channel filler, simply reverse the above steps: the rotating shaft hammer 12 rotates 90° in the opposite direction to reset, the piston of the upper and lower die locking cylinder moves down, the upper die opening cylinder retracts and drives the upper die 21 to rise, the safety hook cylinder extends forward, and the safety hook re-hooks the upper die 21 to ensure safety.

[0055] During the rubber extrusion process, the rubber temperature is easily raised due to shearing heat. To prevent the rubber from overheating and deforming or premature vulcanization, cooling water pipes are installed at the junction of the lower die 22 and the roller 3 and inside the roller 3.

[0056] Specifically, a copper coil is embedded in the base of the transition section 113 of the lower mold 22, and the coil is distributed in a serpentine pattern; the core of the roller 3 is designed with an axial spiral water channel (not shown in the figure).

[0057] Two water circuits are connected by a rotary joint, continuously supplying circulating cooling water to stabilize the temperature of the rubber compound contact surface within the process range, effectively ensuring the fluidity and vulcanization safety of the rubber compound. When it is necessary to extrude products of different widths, the appropriate size of the runner block can be replaced in the runner section of the die head after opening the die head. The runner block adopts a modular design and matches the runner groove of the lower die 22. By replacing the runner block of different widths, the width of the product can be quickly switched without replacing the entire die body, which improves the versatility and production efficiency of the equipment.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A single-roller extruder head for tire tread forming, comprising: The machine body (1) has an inlet (10) and an outlet (11) for the rubber material to enter on its front and rear sides, respectively. The mold assembly (2) includes an upper mold (21) and a lower mold (22) that can be closed relative to each other. The upper mold (21) is movably mounted on the machine body (1). The inlet (10) and outlet (11) are respectively located on the front and rear sides of the area between the upper mold (21) and the lower mold (22). Roller (3), which is rotatably mounted on the machine body (1) and is located at the front end of the discharge port (11) and rotates synchronously with the rubber material as it is extruded from the discharge port (11); Among them, the lower mold (22) is provided with an upwardly inclined discharge channel (221) that connects the discharge port (10) and the discharge port (11) at a position near the inlet (10). The width of the discharge channel (221) gradually increases from one side of the inlet (10), and a stop block (222) is provided on the side of the discharge channel (221) near the discharge port (11). The discharge port (11) is divided into a first channel (111) and a second channel (112). The first channel (111) is the area between the two inclined sides of the stop block (222) and the adjacent side of the discharge channel (221). The second channel (112) is the area between the upper end of the stop block (222) and the upper mold (21).

2. The single-roller extruder head for tire tread forming according to claim 1, characterized in that, The cross-section of the stop block (222) is an isosceles trapezoid, and the two sides of its inclined sides are inclined towards the center.

3. The single-roller extruder head for tire tread forming according to claim 2, characterized in that, A multi-axis pressure relief plate (223) is provided on both sides of the stop block (222). The multi-axis pressure relief plate (223) includes a guide plate (2231) elastically hinged to the lower mold (22) and a diverter plate (2232) elastically hinged to the guide plate (2231). The guide plate (2231) can rotate toward the feed port (10) and the diverter plate (2232) can rotate toward the stop block (222).

4. The single-roller extruder head for tire tread forming according to claim 3, characterized in that, An arc-shaped guide groove (224) is provided on the upper part of the lower mold (22) along the rotation trajectory of the guide plate (2231), and the lower end of the guide plate (2231) slides and guides the guide groove (224).

5. A single-roller extruder head for tire tread forming according to claim 4, characterized in that, The diameter of the discharge channel (221) gradually decreases on the side closer to the roller (3).

6. A single-roller extruder head for tire tread forming according to claim 5, characterized in that, A transition section (113) is provided at the discharge port (11) along the axial direction of the roller (3). The transition section (113) is inclined toward the roller (3) and tangent to the outer end face of the roller (3).

7. A single-roller extruder head for tire tread forming according to claim 6, characterized in that, The first channel (111) has at least one confluence ridge (114) at each of the two discharge ports (11). The cross-section of the confluence ridge (114) is generally wavy, with a convex center and concave sides in the width direction.

8. A single-roller extruder head for tire tread forming according to claim 7, characterized in that, The lower mold (22) has a raised section from both sides towards the center, and the feed port (10) is directly opposite the raised section in the center of the lower mold (22).

9. A single-roller extruder head for tire tread forming according to claim 1, characterized in that, The height of the roller (3) and the distance between it and the upper mold (21) and the lower mold (22) are adjustable.

10. A single-roller extruder head for tire tread forming according to claim 1, characterized in that, The body (1) is provided with a locking mechanism for locking the upper mold (21). The upper mold (21) is provided with a locking hole (211). The locking mechanism includes a rotating shaft hammer (12) that can be inserted into the locking hole (211).

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