Machine head of rubber extruder

Abstract

The utility model discloses a rubber extruder head, which relates to the technical field of rubber production equipment and comprises a mounting block and a plurality of outlets annularly arranged on the mounting block. According to the utility model, when a rubber material enters the extruder head from the screw rod, enters the extruder head through the annularly distributed outlets in the mounting block, and is in contact with the sprue spreader, the rubber material is guided to the S-shaped guide groove by the S-shaped guide sheet on the outer wall of the sprue spreader. When materials flow in the guide groove, the S-shaped path changes the flow direction of the materials, so that the materials are fully mixed and disturbed, the flow velocity gradient is reduced, and the non-uniform shear stress is reduced. And the homogenized material is extruded from the eduction tube to form a high-quality product. According to the design, surface defects such as weld marks and corrugations are avoided through the S-shaped guide groove, and the appearance quality is improved; meanwhile, shear stress is uniformly distributed, excessive vulcanization or degradation of materials is prevented, and mechanical properties such as tensile strength and aging resistance of the product are improved.

Description

Technical Field

[0001] This utility model relates to the technical field of rubber production equipment, specifically a rubber extruder head. Background Technology

[0002] Rubber extrusion molding is a key process in the production of rubber products, and the extruder die head, as the core component of the molding process, directly determines the state of the rubber material flow and the quality of the product. However, existing rubber extruder die heads have significant defects in practical applications, making it difficult to meet the production requirements of high-quality rubber products.

[0003] Currently, most rubber extruder die heads use traditional straight-tube or simple tapered flow channels. During the process of rubber material entering the die head from the screw, the abrupt change in the flow channel cross-section easily leads to turbulent material flow. For example, when producing rubber sealing strips and tire treads with complex cross-sections, the material flows through the area between the die head's flow divider cone and the die orifice. The flow velocity is high in the center, while the material near the die wall experiences slower flow due to greater frictional resistance, creating a significant velocity gradient. This uneven flow velocity results in uneven distribution of shear stress within the material. This can lead to minor defects such as weld lines and ripples on the surface of the extruded product, or even more serious issues like excessive vulcanization or degradation in certain areas, significantly reducing the product's tensile strength, aging resistance, and other key mechanical properties. Utility Model Content

[0004] The purpose of this invention is to provide a rubber extruder head to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this utility model provides a rubber extruder head, including a mounting block, multiple outlets arranged in a ring on the mounting block; a flow divider cone, fixedly installed at the bottom of the mounting block, the flow divider cone being a conical cylinder wider at the top and narrower at the bottom, the outer wall of the flow divider cone being provided with multiple guide plates, adjacent guide plates forming guide grooves, the guide plates being arranged in an S-shape, and the guide grooves formed being also arranged in an S-shape.

[0006] Furthermore, the depth of the guide plate gradually decreases along the feeding direction.

[0007] Furthermore, the outlets are configured to be fan-shaped, with each outlet corresponding to a guide groove.

[0008] Furthermore, a housing is fixedly installed at the bottom of the mounting block. The housing is wider at the top and narrower at the bottom. The guide plate is connected to the inner wall of the housing. An outlet tube is installed at the bottom of the housing.

[0009] Furthermore, a flange is fixedly installed on the top of the mounting block, and multiple bolts are threadedly connected to the bottom of the flange.

[0010] Furthermore, a rubber layer is fixedly installed on the top of the flange, and the height of the rubber layer is greater than that of the flange.

[0011] Furthermore, the mounting block, flange, guide plate, and outlet pipe are all made of stainless steel.

[0012] Furthermore, both the guide plate and the guide groove are provided with a tungsten carbide wear-resistant coating.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. In this invention, when rubber material enters the extruder head from the screw, it enters through the annularly distributed outlets on the mounting block. After contacting the flow divider cone, it is guided to the S-shaped guide groove by the S-shaped guide plates on its outer wall. As the material flows within the guide groove, the S-shaped path changes its flow direction, promoting thorough mixing and agitation, reducing the velocity gradient, and minimizing shear stress unevenness. The homogenized material is then extruded from the outlet pipe to form a high-quality product. This design avoids surface defects such as weld lines and ripples through the S-shaped guide groove, improving appearance quality; simultaneously, it ensures uniform shear stress distribution, preventing excessive vulcanization or degradation of the material, and improving the product's tensile strength, aging resistance, and other mechanical properties.

[0015] 2. In this utility model, the depth of the guide plate gradually becomes shallower along the feeding direction. This design can reasonably reduce the flow cross-sectional area of ​​the guide groove along the feeding direction according to the pressure change characteristics of the rubber material during the material flow process, thereby gradually increasing the material flow rate, ensuring that the pressure distribution of the material in the entire flow channel is more uniform, and avoiding flow turbulence caused by sudden pressure changes. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0018] Figure 3 This is a schematic diagram of the connection structure between the mounting block and the outlet in this utility model;

[0019] Figure 4 for Figure 1 Enlarged view of the structure at point A in the middle.

[0020] In the diagram: 1. Mounting block; 2. Outlet; 3. Diverter cone; 4. Guide plate; 5. Outer shell; 6. Outlet pipe; 7. Rubber layer; 8. Flange; 9. Bolt; 10. Guide groove. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-4 This utility model provides a technical solution:

[0023] See Figures 1-4 As shown, a rubber extruder head includes a mounting block 1, multiple outlets 2 arranged in a ring on the mounting block 1; a flow divider cone 3, fixedly installed at the bottom of the mounting block 1, the flow divider cone 3 being a cone-shaped column wider at the top and narrower at the bottom, the outer wall of the flow divider cone 3 being provided with multiple guide plates 4, adjacent guide plates 4 forming a guide groove 10, the guide plates 4 being arranged in an S-shape, and the guide groove 10 formed is also arranged in an S-shape.

[0024] When the rubber material enters the extruder head from the screw, it first enters the head evenly through multiple outlets 2 arranged in a ring on the mounting block 1. Subsequently, the material comes into contact with a flow divider cone 3 fixedly installed at the bottom of the mounting block 1. The flow divider cone 3 has a conical structure that is wider at the top and narrower at the bottom, and multiple S-shaped guide plates 4 on its outer wall guide the material into the S-shaped guide grooves 10 formed between adjacent guide plates 4. During the flow of the material through the S-shaped guide grooves 10, the S-shaped path continuously changes the flow direction of the material, causing thorough mixing and disturbance of the material flow that was originally faster at the center and slower at the edges. This mixing effectively reduces the velocity gradient, making the material flow velocity more uniform, thereby reducing the uneven distribution of shear stress within the material. Finally, the homogenized material is extruded through the bottom outlet pipe 6 to form higher quality rubber products.

[0025] The S-shaped guide groove 10 homogenizes the material flow, avoiding surface defects such as weld lines and ripples caused by uneven flow rate in traditional flow channels, thus significantly improving the appearance quality of extruded products.

[0026] When the material flows in the guide channel 10, the disturbance of the S-shaped path makes the shear stress distribution more uniform, preventing excessive vulcanization or degradation of local materials due to excessive shearing, thereby greatly improving the product's key mechanical properties such as tensile strength and aging resistance.

[0027] See Figure 2 The depth of guide plate 4 gradually decreases along the feeding direction.

[0028] The depth of the guide plate 4 gradually decreases along the feeding direction. This design allows the flow cross-sectional area of ​​the guide groove 10 to be reasonably reduced along the feeding direction according to the pressure change characteristics of the rubber material during the material flow process. This gradually increases the material flow rate, ensuring a more uniform pressure distribution of the material in the entire flow channel and avoiding flow turbulence caused by sudden pressure changes. At the same time, as the depth of the guide plate 4 decreases, the shearing effect on the material gradually increases, which helps to further eliminate the flow velocity gradient inside the material and effectively compensate for the difference in material flow velocity between the center and the edge. Ultimately, this achieves a highly uniform flow velocity of the material at the outlet 2 of the outlet pipe 6, thereby significantly improving the surface quality and mechanical properties of the extruded product.

[0029] See Figure 3 The shape of outlet 2 is set as a fan shape, and each outlet 2 corresponds to a guide groove 10.

[0030] The outlet 2 is designed in a fan shape, with each outlet 2 corresponding to a guide groove 10. The fan-shaped outlet 2 design allows the rubber material to enter the guide groove 10 at a more uniform angle and direction when it enters the die head from the screw, reducing the flow turbulence caused by sudden changes in direction at the inlet. The one-to-one correspondence between the outlet 2 and the guide groove 10 ensures a clear and stable material flow path, avoids mutual interference between materials in different flow channels, and allows the material to flow in the guide groove 10 along a predetermined S-shaped path. This fully utilizes the role of the guide plate 4 and the guide groove 10 in homogenizing the material flow rate, thereby effectively improving the quality and consistency of the extruded product.

[0031] See Figure 1 The bottom of the mounting block 1 is fixedly mounted with a housing 5. The housing 5 is wider at the top and narrower at the bottom. The guide plate 4 is connected to the inner wall of the housing 5. The bottom of the housing 5 is equipped with an outlet tube 6.

[0032] A housing 5 is fixedly installed at the bottom of the mounting block 1. The housing 5 is wider at the top and narrower at the bottom. The guide plate 4 is connected to the inner wall of the housing 5. An outlet pipe 6 is installed at the bottom of the housing 5. The structure of the housing 5, which is wider at the top and narrower at the bottom, can play a preliminary role in gathering and guiding the rubber material entering the die head, so that the material flows naturally towards the center. This facilitates the subsequent diversion and homogenization of the material by the guide plate 4 and the guide groove 10. At the same time, the housing 5 provides a stable support for the guide plate 4, which enhances the stability of the guide plate 4 under material extrusion and ensures that the guiding structure can continuously and effectively guide the material. The outlet pipe 6 installed at the bottom of the housing 5 provides a unified outlet 2 channel for the homogenized material, ensuring that the material is extruded in a stable state, which helps to improve the molding quality and stability of the extruded product.

[0033] See Figure 1 A flange 8 is fixedly installed on the top of the mounting block 1, and multiple bolts 9 are threadedly connected to the bottom of the flange 8.

[0034] A flange 8 is fixedly installed on the top of the mounting block 1. Multiple bolts 9 are threaded to the bottom of the flange 8. Through the cooperation of the flange 8 and the bolts 9, the rubber extruder head can be quickly and firmly connected to other parts of the extruder, such as the screw. During installation, the multiple bolts 9 can be tightened to achieve stable and tight fixing, ensuring the sealing between the head and other parts and preventing leakage of rubber material during extrusion. At the same time, when the head needs to be disassembled for maintenance or replacement, it can be quickly separated by simply unscrewing the bolts 9, which is convenient and quick, greatly improving the maintenance efficiency of the equipment and reducing the maintenance difficulty.

[0035] See Figure 1 A rubber layer 7 is fixedly installed on the top of flange 8, and the height of rubber layer 7 is greater than that of flange 8.

[0036] A rubber layer 7 is fixedly installed on the top of the flange 8. The height of the rubber layer 7 is greater than that of the flange 8. The rubber layer 7 is soft and can act as a buffer when the die head is connected to other parts of the extruder, avoiding direct rigid contact between the flange 8 and other parts, which would cause wear and damage and extend the service life of the flange 8. In addition, the rubber layer 7, which is higher than the flange 8, can better fill the joint gap, enhance the sealing of the joint, and prevent material leakage. At the same time, during the operation of the equipment, the rubber layer 7 can also absorb some vibration and noise, reduce the vibration transmission during the operation of the equipment, reduce the operating noise, and make the equipment run more smoothly and quietly.

[0037] See Figure 1 The mounting block 1, flange 8, guide plate 4, and outlet pipe 6 are all made of stainless steel.

[0038] Mounting block 1, flange 8, guide plate 4, and outlet pipe 6 are all made of stainless steel. Stainless steel has excellent corrosion resistance, which can effectively resist the erosion of chemicals that may be generated during the extrusion process of rubber materials, extend the service life of these components, and reduce equipment damage and maintenance frequency caused by corrosion. At the same time, stainless steel has high strength and hardness, which can maintain structural stability under high pressure extrusion of rubber materials, avoid component deformation affecting material flow and extrusion effect, and the smooth surface of stainless steel can reduce the flow resistance of rubber materials in the flow channel, making the material flow more smoothly, reducing material residue and adhesion, and helping to ensure the quality of extruded products and production efficiency.

[0039] See Figure 1 Both the guide plate 4 and the guide groove 10 are provided with a tungsten carbide wear-resistant coating.

[0040] Both the guide plate 4 and the guide groove 10 are coated with a tungsten carbide wear-resistant coating. Tungsten carbide has extremely high hardness and wear resistance, which can effectively resist the frictional loss generated by the rubber material during the flow process, significantly extend the service life of the guide plate 4 and the guide groove 10, reduce the replacement frequency and maintenance costs caused by component wear, and at the same time maintain the smoothness of the flow channel surface of the guide groove 10, reduce the material flow resistance, and avoid material flow disorder and uneven flow rate caused by surface wear and roughness. This ensures that the rubber material always maintains a good guiding effect in the guide groove 10, thereby stabilizing the quality of the extruded product.

[0041] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A rubber extruder head, comprising a mounting block (1), characterized in that: Multiple outlets (2) are arranged in a ring on the mounting block (1); The diversion cone (3) is fixedly installed at the bottom of the mounting block (1). The diversion cone (3) is a cone-shaped column that is wider at the top and narrower at the bottom. The outer wall of the diversion cone (3) is provided with multiple guide plates (4). The guide plates (4) form a guide groove (10) between adjacent guide plates (4). The guide plates (4) are arranged in an S-shape, and the guide groove (10) is also arranged in an S-shape.

2. The rubber extruder head as described in claim 1, characterized in that: The depth of the guide plate (4) gradually decreases along the feeding direction.

3. The rubber extruder head as described in claim 2, characterized in that: The outlet (2) is fan-shaped, and each outlet (2) corresponds to a guide groove (10).

4. The rubber extruder head as described in claim 3, characterized in that: The bottom of the mounting block (1) is fixedly mounted with a housing (5), which is wider at the top and narrower at the bottom. The guide plate (4) is connected to the inner wall of the housing (5), and the bottom of the housing (5) is equipped with an outlet pipe (6).

5. A rubber extruder head as described in claim 4, characterized in that: A flange (8) is fixedly installed on the top of the mounting block (1), and a plurality of bolts (9) are threadedly connected to the bottom of the flange (8).

6. A rubber extruder head as described in claim 5, characterized in that: A rubber layer (7) is fixedly installed on the top of the flange (8), and the height of the rubber layer (7) is greater than that of the flange (8).

7. A rubber extruder head as described in claim 6, characterized in that: The mounting block (1), flange (8), guide plate (4), and outlet pipe (6) are all made of stainless steel.

8. A rubber extruder head as described in claim 7, characterized in that: Both the guide plate (4) and the guide groove (10) are provided with a tungsten carbide wear-resistant coating.

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