A device for increasing the density of rubber extrusion and a rubber extruder

Abstract

The utility model discloses a device that increases rubber extrusion density, is installed between the screw bush and die holder connecting section of rubber extruder, including connecting ring, the both ends of connecting ring are detachable connection with screw bush and die holder connecting section respectively, and the inner ring diameter of connecting ring is identical with the flow channel diameter of screw bush and die holder connecting section connecting place, to form the flow channel for prolonging the through path of rubber material of continuous through. Adopt above -mentioned technical scheme, can directly improve the back pressure of rubber material through physical structure change, and the effect of increasing density is remarkable and stable, need not change the existing rubber formula, do not introduce new cost, do not influence the original performance of material. The utility model further provides a rubber extruder.

Description

Technical Field

[0001] This utility model relates to the field of rubber extruders, and in particular to a device for increasing the extrusion density of rubber and a rubber extruder. Background Technology

[0002] In rubber extrusion molding, the density of the product directly determines its mechanical properties, durability and dimensional stability. Insufficient density can easily lead to more pores, deformation and cracking in the product, affecting its performance.

[0003] Existing density-enhancing solutions all have significant limitations: adding high-density fillers alters the basic properties of the rubber compound, such as elasticity and toughness, and increases raw material costs; while adding a filter screen to the extruder die head can increase back pressure and compact the rubber compound, it also increases flow resistance, energy consumption, and is prone to causing scorching and product delamination due to filter screen clogging; frequent filter screen replacements also reduce production efficiency; optimizing the screw compression ratio requires custom processing, which is costly, time-consuming, and has poor adaptability; vacuum degassing can only remove free air bubbles in the rubber compound and is ineffective against dissolved microbubbles, thus failing to fundamentally solve the density problem.

[0004] Existing technical solutions for increasing the density of rubber extruded products may alter the properties of the rubber compound, increase costs, or suffer from drawbacks such as high energy consumption, low efficiency, and narrow applicability. Furthermore, they cannot solve the problem of insufficient local density in products caused by the twisted discharge pattern at the extruder exit. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies for increasing the density of extruded rubber products, such as altering rubber compound properties, increasing costs, high energy consumption, low efficiency, and narrow applicability. Furthermore, these technologies fail to solve the problem of insufficient density in certain areas of the product caused by the twisted discharge pattern at the extruder exit. This invention provides a device and a rubber extruder for increasing the density of extruded rubber. It directly increases the back pressure of the rubber compound through changes in its physical structure, resulting in a significant and stable density-increasing effect without altering the existing rubber formulation, introducing new costs, or affecting the original properties of the rubber compound.

[0006] To solve the above-mentioned technical problems, the present invention discloses a device for increasing the extrusion density of rubber, which is installed between the screw sleeve and the die base connection section of a rubber extruder. The device includes a connecting ring, the two ends of which are detachably connected to the screw sleeve and the die base connection section, respectively. The inner diameter of the connecting ring is consistent with the flow channel diameter at the connection between the screw sleeve and the die base connection section, so as to form a continuous flow channel to extend the flow path of the rubber compound.

[0007] By adopting the above technical solution, the back pressure of the rubber compound can be directly increased by changing the physical structure. The densification effect is significant and stable, without changing the existing rubber formula, without introducing new costs, and without affecting the original performance of the rubber compound.

[0008] According to another specific embodiment of the present invention, the length of the connecting ring is disclosed to be 13cm-18cm.

[0009] According to another specific embodiment of the present invention, the present invention discloses that the connecting ring and the connecting section of the threaded sleeve and the mold base are detachably connected by a flange, thread or snap-fit ​​structure.

[0010] According to another specific embodiment of the present invention, the connecting ring is integrally molded, and the inner surface of the inner ring of the connecting ring is a mirror-polished surface.

[0011] According to another specific embodiment of the present invention, the connecting ring is made of one of the following: quenched steel, wear-resistant alloy, or steel with ceramic coating.

[0012] According to another specific embodiment of the present invention, the device for increasing the extrusion density of rubber further includes a temperature sensor and / or a pressure sensor disposed on the connecting ring, for detecting the temperature of the rubber compound flowing through the connecting ring and / or the pressure within the connecting ring.

[0013] According to another specific embodiment of the present invention, the outer wall of the connecting ring is fitted with a cooling component, which is connected to an external cooling system.

[0014] According to another specific embodiment of the present invention, the present invention discloses a connecting ring with an adjustable length combination structure, which includes multiple coaxially arranged sub-connecting rings; each sub-connecting ring has the same specifications; the two ends of each sub-connecting ring can be detachably connected to each other, and the inner ring diameter of all sub-connecting rings is the same.

[0015] According to another specific embodiment of the present invention, the present invention also provides a rubber extruder, which includes any of the above-described devices for increasing the rubber extrusion density.

[0016] The beneficial effects of this application are as follows: 1. Direct and effective: It directly increases back pressure by changing the physical structure, resulting in a significant and stable densification effect.

[0017] 2. Maintain the formula: No need to change the existing rubber formula, no new costs are introduced, and the original properties of the rubber compound are not affected.

[0018] 3. Improve quality: It helps reduce bubble defects, stabilize product dimensions, and improve surface quality.

[0019] 4. High flexibility: This device can be used as a standardized module, suitable for different models of extruders, and is easy to install and disassemble. Attached Figure Description

[0020] Figure 1 This diagram illustrates the structure of the device for increasing rubber extrusion density according to an embodiment of the present invention. Figure 2 Show Figure 1 Enlarged diagram of point A in the middle.

[0021] Among them, 1. mold base connecting section; 2. threaded sleeve; 3. connecting ring; 11. first annular groove stop; 21. second annular protrusion stop; 31. inner ring; 32. first annular protrusion stop; 33. second annular groove stop. Detailed Implementation

[0022] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0023] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the 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 the utility model.

[0025] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0026] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0028] Reference Figures 1 to 2 This application provides a device for increasing the extrusion density of rubber, which is installed between the screw sleeve 2 and the die base connecting section 1 of a rubber extruder. The device includes a connecting ring 3, with both ends of the connecting ring 3 being detachably connected to the screw sleeve 2 and the die base connecting section 1, respectively. The diameter of the inner ring 31 of the connecting ring 3 is consistent with the diameter of the flow channel at the connection between the screw sleeve 2 and the die base connecting section 1, so as to form a continuous flow channel to extend the flow path of the rubber compound.

[0029] In this embodiment, the connecting ring 3 is installed between the screw sleeve 2 and the die base connecting section 1 of the rubber extruder to extend the flow path of the rubber material. The connecting ring 3 adopts an integral rigid structure, and its axial length is set according to the required compaction time and flow path of the rubber material to ensure that the rubber material has sufficient retention and densification space in the ring.

[0030] The two end faces of the connecting ring 3 are respectively provided with positioning structures adapted to the discharge end of the threaded sleeve 2 and the feed end of the mold base connecting section 1. In one embodiment of this application, the structure of the connecting ring 3 can be: one end of the connecting ring 3 is provided with a first annular protruding stop 32, which is nested and engaged with the first annular groove stop 11 of the discharge end of the threaded sleeve 2; the other end is provided with a second annular groove stop 33, which is nested and engaged with the second annular protruding stop 21 of the feed end of the mold base connecting section 1. The coaxial alignment of the connecting ring 3 with the threaded sleeve 2 and the mold base connecting section 1 is achieved through the positioning of the stop, avoiding misalignment of the flow channel caused by assembly deviation. Of course, the connecting ring 3 can also be connected to the threaded sleeve 2 and the mold base connecting section 1 in other ways.

[0031] Multiple bolt holes can be provided on both ends of the connecting ring 3 outside the stop, which match the bolt holes of the threaded sleeve 2 and the mold base connecting section 1. During assembly, high-strength bolts are passed through the bolt holes to detachably fix the connecting ring 3 between the threaded sleeve 2 and the mold base connecting section 1, ensuring that the three are tightly connected without any loose gaps.

[0032] The inner ring 31 of the connecting ring 3 is a smooth and continuous cylindrical flow channel. The diameter of the inner ring 31 is consistent with the diameter of the flow channel at the discharge end of the screw sleeve 2 and the diameter of the flow channel at the inlet end of the die base connecting section 1. After assembly, the three flow channels form a continuous and stepless through channel. After the rubber material flows out from the screw sleeve 2, it is smoothly transported to the die base connecting section 1 through the extended flow channel of the connecting ring 3. In the process, by extending the flow path, the pressure transmission time inside the rubber material and the tightness of the molecular bonding are increased, reducing air bubbles and loose areas in the rubber material, thereby increasing the density of the extruded product.

[0033] By adopting the above technical solution, the back pressure of the rubber compound can be directly increased by changing the physical structure. The densification effect is significant and stable, without changing the existing rubber formula, without introducing new costs, and without affecting the original performance of the rubber compound.

[0034] In one feasible embodiment, the length of the connecting ring 3 is 13cm-18cm.

[0035] In this embodiment, the length of the connecting ring 3 is selected according to the type, hardness, and extrusion speed of the rubber compound to be extruded. The length of the connecting ring 3 is set to 13cm-18cm, which can cover the basic requirements of most rubber extrusion scenarios. Its specific size needs to be designed and optimized according to the actual processing conditions. For rubber compounds with good flowability and easy relaxation of molecular chains, such as natural rubber, a shorter connecting ring 3, such as a connecting ring 3 of 13cm-15cm, can be selected to avoid excessive retention of rubber due to excessively long paths. For rubber compounds with strong molecular chain rigidity, such as nitrile rubber and fluororubber, which require more time to achieve tight molecular bonding, a connecting ring 3 of 16cm-18cm can be selected to ensure that the rubber compound has sufficient time to complete the release of internal stress and structural densification.

[0036] To address the differences in rubber hardness, when processing low-hardness rubber, which is easily deformed and easier to compact, the length of connecting ring 3 can be appropriately shortened, such as to 13cm-14cm, to prevent the rubber from becoming unstable due to an excessively long path. If processing high-hardness rubber, which has strong resistance to deformation and requires more time to fill gaps under pressure, the length of connecting ring 3 needs to be extended, such as to 17cm-18cm, to provide sufficient time for compaction.

[0037] To address the differences in extrusion speed, when the extruder operates at high speed (e.g., 30-50 r / min), the residence time of the rubber compound in the flow channel is shortened. It is necessary to appropriately increase the length of the connecting ring 3, such as 16cm-18cm, to compensate for the insufficient residence time by extending the path and prevent the rubber compound from entering the die without being fully compacted. If the extruder operates at low speed (e.g., 10-20 r / min), the residence time of the rubber compound is inherently longer. A shorter length of 13cm-15cm can be selected to ensure the compaction effect while avoiding excessively long paths that could lead to excessively high rubber compound temperatures or localized stagnation.

[0038] Through the above-mentioned targeted length optimization, it can be ensured that the rubber material under different processing conditions can obtain appropriate relaxation time and compaction time in the connecting ring 3, release the internal stress generated during the extrusion process, reduce the porosity caused by stress, expel micro bubbles under pressure, promote the close arrangement of molecules, further improve the densification degree of the rubber material before entering the die, and provide a stable guarantee for the subsequent density improvement of extruded products.

[0039] In one feasible embodiment, the connecting ring 3 is detachably connected to the threaded sleeve 2 and the mold base connecting section 1 via a flange, thread, or snap-fit ​​structure.

[0040] In this embodiment, in addition to using a threaded connection, the connecting ring 3 can also be connected to the threaded sleeve 2 and the mold base connecting section 1 in other ways, such as through a flange or a snap-fit ​​structure to achieve a detachable connection. If a flange connection is used, both ends of the connecting ring 3 are integrally formed with annular flanges. Bolt holes are evenly distributed along the circumference of the flanges, and the hole positions and diameters are completely matched with the flanges at the discharge end of the threaded sleeve 2 and the feed end of the mold base connecting section 1. During assembly, the flanges at both ends of the connecting ring 3 are respectively fitted to the flanges of the threaded sleeve 2 and the mold base connecting section 1. High-strength bolts are passed through the corresponding bolt holes and tightened to achieve tight fixation of the three. This is suitable for high-pressure extrusion scenarios, can withstand the radial pressure generated by the flow of rubber, and prevents the connection from loosening.

[0041] If a snap-fit ​​connection is used, the two ends of the connecting ring 3 are respectively provided with elastic snaps evenly distributed along the circumference. The corresponding positions of the discharge end of the screw sleeve 2 and the feed end of the mold base connecting section 1 are provided with annular grooves that are adapted to the snaps. During assembly, align the two ends of the connecting ring 3 with the screw sleeve 2 and the mold base connecting section 1 and push them axially so that the elastic snaps are snapped into the annular grooves for positioning. The bottom of the grooves is provided with anti-slip protrusions to prevent the connecting ring 3 from axially displacing during the flow of the rubber material. It can be quickly disassembled and assembled without tools, which is suitable for production scenarios where the connecting ring 3 needs to be frequently replaced.

[0042] Regardless of the connection structure used, the coaxiality of the connecting ring 3, the screw sleeve 2, and the mold base connecting section 1 can be ensured after assembly, so as to ensure the continuous flow of the three channels and not affect the smooth flow and densification effect of the rubber material.

[0043] In one feasible embodiment, the connecting ring 3 is integrally formed, and the inner surface of the inner ring 31 of the connecting ring 3 is a mirror-polished surface.

[0044] In this embodiment, the connecting ring 3 is manufactured using a one-piece molding process. It is formed into a complete structure through integral casting or forging followed by precision machining, without any splicing gaps or assembly interfaces. The one-piece molding process ensures uniform rigidity of the connecting ring 3, avoiding deformation problems caused by insufficient strength at splicing points. Especially during high-pressure flow of the adhesive, the one-piece molding structure can stably maintain the coaxiality and diameter accuracy of the flow channel, preventing narrowing or misalignment of the flow channel due to localized deformation, and ensuring the continuity of the adhesive flow path.

[0045] Meanwhile, the inner surface of the inner ring 31 of the connecting ring 3 is mirror-polished to create a smooth and flawless mirror finish. This surface treatment significantly reduces the frictional resistance between the rubber compound and the wall of the inner ring 31. On the one hand, it reduces the localized heat buildup caused by friction during the flow of the rubber compound, preventing scorching or performance degradation due to excessive temperature. On the other hand, it prevents rubber particles from adhering to the wall and causing stagnation, reducing the risk of rubber buildup in the flow channel and ensuring that the rubber compound is always smoothly conveyed along the flow channel. This further improves the uniformity of the rubber compound and provides a stable flow basis for subsequent densification. In addition, the smooth mirror-like inner surface facilitates subsequent cleaning and maintenance, reducing the contamination impact of residual rubber compound on the next production run.

[0046] In one feasible embodiment, the connecting ring 3 is made of one of hardened steel, wear-resistant alloy, or steel with a ceramic coating.

[0047] In this embodiment, the connecting ring 3 is made of one of the following: hardened steel, wear-resistant alloy, or steel with a ceramic coating. All three materials are suitable for the high-pressure, high-friction conditions during rubber extrusion. Specifically, If quenched steel is used: After overall quenching treatment, the surface hardness and overall strength of the steel are significantly improved. It can withstand the radial pressure generated by the long-term high-pressure flow of rubber and has good resistance to deformation, which can stably maintain the dimensional accuracy of the flow channel. At the same time, the surface wear resistance of quenched steel is sufficient to cope with the friction loss caused by the flow of rubber. It is suitable for the long-term extrusion production of conventional rubber (such as natural rubber and styrene-butadiene rubber), combining performance and economy.

[0048] If wear-resistant alloy material is used: it is made of wear-resistant base materials such as chromium-molybdenum alloy and high manganese alloy. Its alloy composition can form a high-density wear-resistant structure. The surface hardness is higher than that of ordinary quenched steel, and the resistance to friction loss is stronger. Especially when processing rubber containing reinforcing fillers (such as carbon black and white carbon black), it can effectively resist the erosion and wear of filler particles on the inner wall of the ring, extend the service life of the connecting ring 3, and is suitable for continuous extrusion scenarios of high filler content and high hardness rubber.

[0049] If steel with a ceramic coating is used: high-strength steel is used as the base, and the inner wall surface is sprayed with a ceramic coating such as alumina or zirconium oxide. The ceramic coating has extremely high surface hardness and smoothness. On the one hand, it can minimize the frictional resistance between the rubber and the wall surface and reduce the risk of rubber residue. On the other hand, the ceramic coating has excellent chemical stability, which can avoid the corrosion of the substrate by acidic or alkaline components in the rubber. It is suitable for processing special rubbers (such as fluororubber and silicone rubber) or rubber containing corrosive additives, while taking into account the rigidity of the substrate and the wear resistance and corrosion resistance of the coating.

[0050] All three materials can meet the process requirements of integral molding of the connecting ring 3, and after molding, they can stably maintain the dimensional accuracy and mirror polishing effect of the inner ring 31, ensuring the stability and densification effect of the rubber material flow path.

[0051] In one feasible embodiment, the device for increasing the rubber extrusion density further includes a temperature sensor and / or a pressure sensor disposed on the connecting ring 3 for detecting the temperature of the rubber compound flowing through the connecting ring 3 and / or the pressure within the connecting ring 3.

[0052] In this embodiment, mounting holes for the sensor are radially formed on the side wall of the connecting ring 3. The probe end of the temperature sensor passes through the mounting hole and extends to the vicinity of the inner wall of the inner ring 31 flow channel, without protruding from the inner wall to avoid obstructing the flow of the adhesive. This sensor is used to detect the actual temperature of the adhesive flowing through the connecting ring 3 in real time. The probe end of the pressure sensor is flush with the inner wall of the inner ring 31 flow channel, directly contacting the adhesive to collect the pressure data of the adhesive in the flow channel in real time. A high-temperature resistant sealing gasket is used to seal the mounting gap between the sensor and the connecting ring 3 to prevent adhesive leakage or the entry of external impurities.

[0053] In one feasible embodiment, a control system or display panel can be used to control the entire extruder based on the detection data from temperature and pressure sensors. Specifically, the temperature and pressure sensors can transmit the detected temperature and pressure data to the extruder's control system or display panel, providing data support for the operator to adjust process parameters. When the pressure sensor detects abnormal fluctuations in the rubber pressure within the connecting ring 3, it can prompt the operator to check whether the rubber flowability or extrusion speed is appropriate. When the temperature sensor detects that the rubber temperature exceeds the preset range, it can help determine whether there is excessive frictional heat generation.

[0054] In actual operation, in addition to referring to sensor data, operators can also observe changes in the extruder main unit current: if the current increases significantly, it usually indicates that the shear resistance of the rubber material in the flow channel has increased, and it is easy to generate additional heat due to high shear. At this time, the heating temperature of the die head needs to be appropriately reduced to balance the additional heat through temperature compensation, so as to avoid the rubber material from scorching due to excessive local temperature. At the same time, it ensures that the rubber material is always in a suitable processing temperature range, so that it can be fully relaxed and compacted in the connecting ring 3, and maintain a stable flow state, further improving the density and quality consistency of the extruded products.

[0055] In one feasible embodiment, a cooling assembly is fitted on the outer wall of the connecting ring 3, and the cooling assembly is connected to an external cooling system.

[0056] In this embodiment, a cooling component is fitted on the outer wall of the connecting ring 3. The cooling component is an annular structure that fits into the outer wall of the connecting ring 3. Its inner sidewall is in close contact with the outer wall of the connecting ring 3 to ensure heat conduction efficiency. A continuous cooling channel is opened inside the cooling component. The inlet and outlet of the channel are connected to the external cooling system through pipes to form a closed cooling loop.

[0057] The annular structure of the cooling component can be distributed along the entire circumference of the outer wall of the connecting ring 3, ensuring uniform heating of the connecting ring 3 and avoiding excessive local temperature. The cooling channel adopts a spiral or serpentine arrangement design to extend the residence time of the coolant in the component and improve the heat exchange efficiency. When the rubber material generates frictional heat in the inner ring 31 of the connecting ring 3, or when the temperature rises due to high shear, the heat can be conducted to the cooling component through the wall of the connecting ring 3 and carried away by the circulating coolant, thereby stabilizing the temperature of the inner ring 31 of the connecting ring 3 within the range suitable for processing the rubber material.

[0058] In addition, a heat-insulating gasket is provided at the assembly point of the cooling component and the connecting ring 3 to prevent the low temperature of the cooling component from being conducted to the extruder sleeve 1 or the die holder connecting section 2, thus avoiding affecting the normal operating temperature of the sleeve 1 and the die holder. The inlet of the cooling component can also be equipped with a flow regulating valve, allowing the operator to adjust the coolant flow rate according to the rubber temperature data detected by the temperature sensor, thereby achieving precise temperature control. This further ensures that the rubber material in the connecting ring 3 will not scorch due to excessive temperature or decrease in fluidity due to excessive temperature, and will always maintain a stable state of relaxation and compaction.

[0059] In one feasible embodiment, the connecting ring 3 is a modular structure with adjustable length, which includes multiple coaxially arranged sub-connecting rings; each sub-connecting ring has the same specifications; the two ends of each sub-connecting ring can be detachably connected to each other, and the inner ring 31 of all sub-connecting rings has the same diameter.

[0060] In this embodiment, the connecting ring 3 is a modular structure with adjustable length, which is coaxially assembled from multiple sub-connecting rings of identical specifications. Each sub-connecting ring has a matching detachable connection structure at both ends. Specifically, one end of the sub-connecting ring has an annular protrusion positioning part, and the other end has an annular groove positioning part that matches the protrusion positioning part. Adjacent sub-connecting rings are coaxially connected by "the protrusion positioning part is embedded in the groove positioning part". At the same time, bolt holes are evenly distributed along the circumference on the outer side of the positioning part at both ends of the sub-connecting ring. After the adjacent sub-connecting rings are connected, bolts are passed through the corresponding bolt holes and tightened to complete the stable connection between the two.

[0061] All sub-connecting rings have the same inner ring diameter 31, and the inner surface of the inner ring 31 is mirror polished. When multiple sub-connecting rings are coaxially assembled into a complete connecting ring 3 according to the required quantity, the inner rings 31 of each sub-connecting ring can be seamlessly connected to form a continuous cylindrical flow channel. The diameter of this flow channel is completely matched with the flow channel diameter of the discharge end of the screw sleeve 2 and the feed end of the mold base connecting section 1, ensuring that the rubber material can be smoothly conveyed along the smooth flow channel. The overall length of the connecting ring 3 can be flexibly adjusted by increasing or decreasing the number of sub-connecting rings without affecting the continuity of the flow path and the densification effect of the rubber material.

[0062] In addition, an annular sealing groove is provided at the mating surface of adjacent sub-connecting rings. A high-temperature resistant sealing ring can be embedded in the groove to further prevent the rubber from leaking from the mating gap, while enhancing the overall sealing performance of the combined structure. Furthermore, the outer wall structure of the sub-connecting ring is consistent with that of the single-piece connecting ring 3, which can be adapted to the installation of cooling components, ensuring that the combined connecting ring 3 can also achieve stable temperature control and adapt to different extrusion conditions.

[0063] This application also provides a rubber extruder, including means for increasing the rubber extrusion density.

[0064] In this embodiment, the rubber extruder includes a feeding mechanism, a barrel, a screw sleeve 2, a die base connected in sequence, and the aforementioned device for increasing the rubber extrusion density installed between the screw sleeve 2 and the die base connecting section 1. The assembly of the device with the screw sleeve 2 and the die base connecting section 1 is adapted to the overall structural dimensions of the extruder, ensuring that the normal operation of the original transmission system and heating system of the extruder is not affected.

[0065] During the extruder's operation, the feeding mechanism delivers rubber compound into the barrel. Inside the barrel, the screw mixes and plasticizes the compound before pushing it into the screw sleeve 2. After flowing out from the discharge end of the screw sleeve 2, the compound enters the flow channel of the connecting ring 3, a device for increasing the extrusion density of the rubber. It undergoes thorough relaxation and compaction in the extended flow path of the connecting ring 3. Simultaneously, the temperature / pressure sensors of the device monitor the compound's condition in real time, and the cooling components regulate the flow channel temperature to ensure the compound remains under suitable densification processing conditions. The densed compound, processed by the connecting ring 3, then smoothly enters the die holder, where it is processed into the target shape extruded product by the die holder's forming chamber, ultimately achieving precise density enhancement of the product by the extruder.

[0066] Furthermore, the detachable connection structure of this device for increasing rubber extrusion density is adapted to the daily maintenance needs of the extruder. When the extruder needs to change the type of rubber it processes or for maintenance, the device can be easily disassembled for cleaning or adjustment of the number of sub-connecting rings without modifying the core components of the extruder, such as the screw sleeve 2 and the die holder. This greatly improves the extruder's adaptability to different processing needs and extends the service life of the core components of the extruder, providing a highly efficient and economical equipment solution for rubber extrusion production.

[0067] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A device for increasing the density of rubber extrusion, installed between the screw sleeve (2) and the die base connection section (1) of a rubber extruder, characterized in that, Includes a connecting ring (3), the two ends of which are detachably connected to the screw sleeve (2) and the mold base connecting section (1), and the inner ring (31) diameter of the connecting ring (3) is consistent with the flow channel diameter at the connection between the screw sleeve (2) and the mold base connecting section (1) to form a continuous flow channel to extend the flow path of the rubber compound.

2. The apparatus for increasing rubber extrusion density as described in claim 1, characterized in that, The length of the connecting ring (3) is 13cm-18cm.

3. The apparatus for increasing rubber extrusion density as described in claim 2, characterized in that, The connecting ring (3) is detachably connected to the threaded sleeve (2) and the mold base connecting section (1) through a flange, thread or snap-fit ​​structure.

4. The apparatus for increasing rubber extrusion density as described in claim 3, characterized in that, The connecting ring (3) is threadedly connected to the threaded sleeve (2) and the mold base connecting section (1), wherein, One end of the connecting ring (3) is provided with a first annular protruding stop (32), and the discharge end of the threaded sleeve (2) is provided with a first annular groove stop (11) that matches the first annular protruding stop (32); the other end of the connecting ring (3) is provided with a second annular groove stop (33), and the feed end of the mold base connecting section (1) is provided with a second annular protruding stop (21) that matches the second annular groove stop (33). The first annular protruding stop (32) is threadedly connected to the first annular groove stop (11), and the second annular protruding stop (21) is threadedly connected to the second annular groove stop (33), so that the connecting ring (3) is coaxially aligned with the threaded sleeve (2) and the mold base connecting section (1).

5. The apparatus for increasing rubber extrusion density as described in claim 4, characterized in that, The connecting ring (3) is integrally formed, and the inner surface of the inner ring (31) of the connecting ring (3) is a mirror-polished surface.

6. The apparatus for increasing rubber extrusion density as described in claim 5, characterized in that, The connecting ring (3) is made of one of the following: quenched steel, wear-resistant alloy, or steel with ceramic coating.

7. The apparatus for increasing rubber extrusion density as described in claim 6, characterized in that, The device for increasing rubber extrusion density also includes a temperature sensor and / or a pressure sensor disposed on the connecting ring (3) for detecting the temperature of the rubber compound flowing through the connecting ring (3) and / or the pressure within the connecting ring (3).

8. The apparatus for increasing rubber extrusion density as described in claim 7, characterized in that, The outer wall of the connecting ring (3) is fitted with a cooling component, which is connected to an external cooling system.

9. The apparatus for increasing rubber extrusion density as described in claim 8, characterized in that, The connecting ring (3) is a combined structure with adjustable length, which includes multiple coaxially arranged sub-connecting rings; each sub-connecting ring has the same specifications; the two ends of each sub-connecting ring can be detachably connected to each other, and the inner ring (31) diameter of all sub-connecting rings is the same.

10. A rubber extruder, characterized in that, The apparatus includes the means for increasing the extrusion density of rubber as described in any one of claims 1 to 9.

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