NBR-based adhesive cold feed extrusion molding device and process thereof

Abstract

The application relates to the technical field of extruders, in particular to an NBR-based rubber compound cold-feeding extrusion forming device and a process thereof. The device comprises a chassis, a motor and a cylinder, further comprises a screw assembly and a moving assembly, a feeding port is arranged on one end of the cylinder close to the motor, an exhaust port is arranged on the middle section of the cylinder, a cold water pipe is further arranged on the conveying cylinder, the screw assembly is arranged in the cylinder, the moving assembly is connected in the screw assembly, the moving assembly can control the molten section in the screw assembly to change from a static state to a rotating state, so that the material gathered in the molten section is pushed away from the feeding port, the device utilizes the cooperation of the moving assembly and the screw assembly through the action of friction, realizes the dynamic adjustment of the length and the inclination angle of the protruding block in the screw assembly during the working process of the extruder, and further realizes the adjustment of the conveying efficiency of the extruder during the melting process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of extruders, in particular to a NBR-based rubber compound cold-feeding extrusion forming device and process thereof. BACKGROUND

[0002] The NBR-based rubber compound cold-feeding extrusion forming is an important rubber manufacturing technology, which usually softens rubber particles by heating and mixing, and then feeds them into an extruder, and then extrudes them into a specific shape through a long die. In the process of cold-feeding extrusion of rubber, the rubber particles do not need to be preheated, but rely on the pressure and shear generated by the rotation of the screw to push the melt forward through the friction between the screw thread and the melt during the rotation of the screw.

[0003] However, in the manufacturing process of the screw at home and abroad, the thread piece and the screw body are inclinedly arranged at a fixed angle, and the formed inclined included angle is fixed. Although such a screw is relatively easy to process, the efficiency of the extruder is not high, and the discharge amount is limited by the physical properties of the material. If the material components need to be processed, the oil components inside will slip in the screw, so it is necessary to design different pushing angles, i.e. the above-mentioned inclined included angle, to have different pushing angles in the feeding section, in the middle of the screw and in the last pressure extrusion part, so as to improve the yield.

[0004] Therefore, the prior art provides some solutions. In the prior art, the desired mixing of the screw on the polymeric material can be obtained by selectively controlling and adjusting the angle and offset parameters of the lugs, which solves the problem of changing the working characteristics of the extruder during the process of NBR-based rubber compound cold-feeding extrusion, so as to match specific conditions or standards, but it fails to solve the problem of dynamically changing the mixing and mixing during the process of NBR-based rubber compound cold-feeding extrusion.

[0005] In view of this, in order to overcome the above technical problems, the present application designs a NBR-based rubber compound cold-feeding extrusion forming device and process thereof, which solves the above technical problems. SUMMARY

[0006] The present application aims to provide a NBR-based rubber compound cold-feeding extrusion forming device to improve the flexibility of the cold-feeding extrusion forming device during the extrusion of the NBR-based rubber compound. By cooperating the moving assembly in the melting section to mix the NBR-based rubber compound fed from the feeding port to different degrees, the above-mentioned purpose is achieved.

[0007] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0008] The application provides a NBR-based rubber compound cold feed extrusion molding device, which comprises a chassis, a motor and a barrel, further comprises a screw assembly and a moving assembly, a feed port is formed on one end of the barrel close to the motor, an exhaust port is formed on the middle section of the barrel, a cold water pipe is further installed on the conveying barrel, the screw assembly is installed inside the barrel, the moving assembly is connected inside the screw assembly, the moving assembly can control the molten section of the screw assembly to change from a static state to a rotating state, thereby pushing the material gathered in the molten section away from the feed port.

[0009] By using the combination of the screw assembly and the moving assembly, higher production efficiency can be achieved. The moving assembly can control the rotating state of the molten section, thereby pushing the material, which helps to improve the speed and efficiency of extrusion molding. The design and control of the screw assembly can ensure that the material flows uniformly during extrusion, thereby producing consistent products, which is very important for NBR-based rubber compound products that require high quality and consistency. The cold water pipe installed in the device can effectively control the temperature during the extrusion molding process, which helps to prevent overheating or burning of the material, while also accelerating the cooling and solidification of the molded material. Due to the uniform extrusion and precise temperature control, this device helps to reduce the waste rate and reduce production costs.

[0010] The screw assembly further comprises a feeding section, a melting section and an extrusion section; one end of the feeding section is connected with the motor, the other end of the feeding section is connected with one end of the melting section, the other end of the melting section is connected with the extrusion section; the feeding section, the melting section and the extrusion section are coaxially connected in sequence from left to right on the screw assembly; the feeding section, the melting section and the extrusion section are all hollow structures, and the three are coaxially connected to form an axial through channel.

[0011] One end of the feeding section is connected with the motor, which helps to effectively transport the raw materials into the device. This ensures continuous supply of raw materials and improves production efficiency. The melting section is used to heat and melt the raw materials for subsequent extrusion molding. The central position of this section helps to uniformly heat the raw materials during melting, thereby ensuring the consistency and quality of the molded materials. The extrusion section is responsible for extruding the melted raw materials into the desired product shape. Due to the continuous coaxial structure of the screw assembly, continuous and stable extrusion can be achieved, which helps to reduce defects in the extruded products. The coaxial connection of the three sections forms an axial through channel, which helps to ensure uniform flow of raw materials during the entire extrusion process, thereby improving the uniformity and consistency of the products.

[0012] The melting section includes a sleeve, a scraping cylinder, a limiting groove, a sliding block, an adjusting groove, a protruding block, and a spring. The right end of the feeding section is installed with a sleeve, the outer periphery of the sleeve is installed with a scraping cylinder, the scraping cylinder is uniformly surrounded around the sleeve, the center of the scraping cylinder is provided with a through hole, the through hole can pass through the sleeve, the through hole is installed with a protruding block, one side of the lower end of the scraping cylinder is provided with a limiting groove, the limiting groove is slidably installed with a sliding block, the other side of the scraping cylinder is provided with an adjusting groove, the adjusting groove is connected with a spring, and the spring is used to change the offset of the scraping cylinder to reduce the friction of the moving assembly during movement.

[0013] The design of the scraping cylinder makes it uniformly surround the outer periphery of the sleeve, and the protruding block ensures the uniform spacing of the through hole. This helps to ensure that the raw materials are uniformly heated and stirred in the melting section, thereby producing uniform molten materials, which is beneficial to the quality of the products. The combination of the limiting groove and the sliding block allows precise control of the position of the scraping cylinder. This can be used to adjust the flow and pressure of the raw materials during extrusion to meet the requirements of different products. The presence of the spring allows the offset of the scraping cylinder to be adjusted, reducing the friction of the moving assembly during movement. This helps to improve the stability and life of the device and reduce energy consumption. Due to the design of the scraping cylinder and the sliding block, the device can automatically adjust the working state of the melting section to some extent, reducing the need for operator intervention and improving production efficiency.

[0014] The sliding block is a conical shape with a narrow top and a wide bottom, and the top end of the sliding block is provided with a rounded corner to facilitate the sliding of the scraping cylinder. The cooperation between the limiting groove and the sliding block allows the melting section to better play a limiting role when it is extruded by the moving assembly.

[0015] The design of the sliding block allows it to better embed in the limiting groove, thereby providing stronger limiting action. This helps to ensure that the melting section maintains a stable position when it is extruded by the moving assembly, preventing unnecessary movement or shaking. With better limiting action, the molten material in the melting section can maintain stable flow during extrusion, thereby improving the efficiency and consistency of extrusion. The combined design of the limiting groove and the sliding block not only improves performance, but also helps to reduce the maintenance requirements of the device, prolonging the life of the equipment. Through the cooperation design of the sliding block and the limiting groove, precise control of the position of the melting section can be achieved. This helps to adjust the working parameters during extrusion to meet the requirements of different products.

[0016] The moving assembly includes a hydraulic cylinder, a guide rod, a moving block, and a connecting key. The feeding section is installed with a hydraulic cylinder, which forms a sandwich between the hydraulic cylinder and the feeding section. The output end of the hydraulic cylinder is installed with a guide rod, the other end of the guide rod is installed with a connecting key, the connecting key changes the melting section from a static state to a rotating state, and the right end of the connecting key is installed with a moving block.

[0017] The hydraulic cylinder serves as the driving force source for the moving assembly, providing precise force and displacement control. This helps ensure accurate positioning and control when changing the molten section from a stationary state to a rotating state in the screw assembly, resulting in a highly precise extrusion process. The output force and displacement of the hydraulic cylinder can be adjusted by controlling the hydraulic system to adapt to different extrusion requirements and product specifications. This flexibility makes the device more versatile. The hydraulic system can achieve fast or slow movement, depending on the required extrusion speed. This speed control helps adapt to the extrusion speed requirements of different materials and products. Due to the precise control of the hydraulic cylinder, the device can achieve a highly stable extrusion process, ensuring product consistency and quality. This also helps reduce waste. The automated control of the hydraulic cylinder makes the entire extrusion process easier to automate, reducing the need for operator intervention and improving production efficiency.

[0018] The cross-sectional shape of the moving block is "convex". The convex moving block can reduce resistance and make the convex block stage up, reducing friction and resistance during movement of the moving block. The length of the moving block is consistent with the length of the molten section.

[0019] Due to the shape of the "convex" moving block, it reduces the contact area with the wall surface during movement, thereby reducing friction and resistance. This helps reduce the energy consumption of the moving assembly and improves efficiency. The convex block in the device can be stage up during the movement of the moving block, which helps to push the molten material more evenly. Uniform pushing helps achieve consistent extrusion molding and improves product quality. The length of the moving block is consistent with the length of the molten section, which means that the moving block can continuously provide stable pushing force during the extrusion process, ensuring the stability and consistency of the extrusion process. Reducing friction and resistance means that the hydraulic system needs to consume less energy to push the moving block. This helps save energy and reduce operating costs. Reducing the friction and resistance of the moving block helps prolong the life of the moving block, reduces maintenance requirements, and improves the reliability of the device.

[0020] A connecting key is installed between the guide rod and the moving block, which can move in the limiting slot opened in the sleeve. The length of the limiting slot is the sum of the length of the moving block and the width of the two connecting keys.

[0021] The connecting keys can move within the limiting grooves, and the length of the limiting grooves matches the sum of the length of the moving block and the width of the two connecting keys. This design ensures precise position control of the guide rod and the moving block, which helps to achieve precise adjustment and consistency of the extrusion process. Due to precise position control, the guide rod can ensure that the moving block maintains a stable trajectory during movement. This helps to stabilize the extrusion molding process and reduces product unevenness. The design of the connecting keys and limiting grooves reduces friction between the guide rod and the moving block, which helps to prolong the service life of the device and reduce maintenance requirements. Precise position control and stable extrusion process make the entire device easier to automate, reducing the need for operator intervention and improving production efficiency. By ensuring the accurate position of the moving block, the consistency and quality of the extruded product can be improved, and the scrap rate can be reduced.

[0022] The application also provides a NBR-based rubber compound cold feed extrusion molding process, and the process flow is as follows:

[0023] S1: The NBR-based rubber compound and the required additives are mixed in a certain proportion. The content of nitrile rubber is selected to be 60%-80%, the content of filler is controlled to be 10%-30%, the content of plasticizer is controlled to be 5%-15%, the content of vulcanizing agent is 1%-5%, and the content of accelerant and antioxidant is 1%-3%;

[0024] S2: The staff sends the mixed raw materials into the feeding port, and the motor drives the feeding section to start rotating. The auger of the feeding section compresses and mixes the fed rubber compound, and then preheats the melting section. At the same time, the hydraulic cylinder drives the moving assembly to move towards the melting section. The moving block gradually lifts the protruding blocks in a wave-like manner one by one until the melting section reaches 75-85 DEG C. The connecting keys move to the connection between the feeding section and the melting section.

[0025] S3: When the connecting keys move to the connection between the feeding section and the melting section, the feeding section can drive the melting section and the extrusion section to rotate together. At the same time, the moving block pushes out the protruding blocks so that the protruding blocks can contact the inner wall of the cylinder. The resistance of the rubber compound through the melting section increases, and the elongated protruding blocks can fully mix the rubber compound. At the end of the melting section, all the rubber compound is melted and changes into a viscous flow state. Finally, under the pushing of the auger, the rubber compound realizes cold feed extrusion.

[0026] The beneficial effects of the application are as follows:

[0027] 1. The NBR-based rubber compound cold feed extrusion molding device of the application adjusts the length and inclination angle of the protruding blocks in the screw assembly dynamically during the operation of the extruder by the action of friction and the cooperation of the moving assembly and the screw assembly, thereby adjusting the conveying efficiency of the extruder during melting.

[0028] 2. The NBR-based rubber material cold-feeding extrusion forming device of the present application, through force transmission and the cooperation of the moving assembly and the scraping cylinder, realizes dynamic adjustment of the rotating state of the melting section in the screw assembly during the operation of the extruder, and further realizes intermittent operation of the extruder during melting.

[0029] 3. The NBR-based rubber material cold-feeding extrusion forming device of the present application, through the action of friction force and the cooperation of the moving assembly and the screw assembly, realizes dynamic adjustment of the structure of the screw assembly during the operation of the extruder, and further realizes dynamic mixing and mixing of different NBR-based rubber materials under different requirements. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0031] Figure 1 is a schematic diagram of the overall structure of the present application;

[0032] Figure 2 is a sectional view of one working state of the present application;

[0033] Figure 3 is a sectional view of another working state of the present application;

[0034] Figure 4 is a schematic diagram of the feeding section of the present application;

[0035] Figure 5 is a schematic diagram of the melting section of the present application;

[0036] Figure 6 is a schematic diagram of the moving block of the present application;

[0037] Figure 7 is a sectional view of the vertical working state of the scraping cylinder of the present application;

[0038] Figure 8 is a sectional view of the inclined working state of the scraping cylinder of the present application;

[0039] Figure 9 is a process flow diagram of the present application.

[0040] In the figure: 1, base plate; 2, motor; 3, barrel; 31, feeding port; 32, exhaust port; 33, cold water pipe; 4, screw assembly; 41, feeding section; 42, melting section; 421, sleeve; 422, limiting groove; 423, scraping cylinder; 424, limiting groove; 425, sliding block; 426, adjusting groove; 427, protruding block; 428, spring; 43, extrusion section; 5, moving assembly; 51, hydraulic cylinder; 52, guide rod; 53, moving block; 54, connecting key. DETAILED DESCRIPTION

[0041] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the drawings and specific embodiments of the specification.

[0042] As Figure 1 shown, the present application provides a kind of NBR base rubber cold feeding extrusion forming device, including base plate 1, motor 2 and barrel 3, still including screw assembly 4 and moving assembly 5, the barrel 3 is close to the end of motor 2 and is provided with feeding port 31, the barrel 3 middle section is provided with exhaust port 32, conveying barrel 3 is also installed with cold water pipe 33, the barrel 3 inside is installed with screw assembly 4, the screw assembly 4 is connected with moving assembly 5, the moving assembly 5 can control the melting section 42 in screw assembly 4 from static state changes to rotating state, in turn make the material gathered in melting section 42 push away feeding port 31.

[0043] By using the combination of screw assembly 4 and moving assembly 5, higher production efficiency can be achieved. Moving assembly 5 can control the rotating state of melting section 42, thereby pushing the material, which helps to improve the speed and efficiency of extrusion molding. The design and control of screw assembly 4 can ensure that the material flows uniformly during extrusion, thereby producing consistent products, which is very important for NBR base rubber products that require high quality and consistency. The device is installed with cold water pipe 33, which can effectively control the temperature during extrusion molding, which helps to prevent overheating or burning of the material, while also accelerating the cooling and solidification of the molded material. Due to the uniform extrusion and precise temperature control, this device helps to reduce the waste rate and reduce production costs.

[0044] As Figure 2 , 3 , 4 and 5, the screw assembly 4 also includes feeding section 41, melting section 42 and extrusion section 43; one end of the feeding section 41 is connected with the motor 2, the other end of the feeding section 41 is connected with one end of the melting section 42, the other end of the melting section 42 is connected with the extrusion section 43; the screw assembly 4 from left to right in order is feeding section 41, melting section 42 and extrusion section 43; the feeding section 41, melting section 42 and extrusion section 43 are all hollow structure, three coaxial connection constitutes the channel that passes through axially.

[0045] The feeding section 41 is connected to the motor 2 at one end, which helps to effectively transport the raw materials into the device. This ensures continuous supply of raw materials, improving production efficiency. The melting section 42 is used to heat and melt the raw materials for subsequent extrusion molding. The central position of this section helps to uniformly heat the raw materials during melting, ensuring the consistency and quality of the molded materials. The extrusion section 43 is responsible for extruding the melted raw materials into the desired product shape. Due to the continuous coaxial structure of the screw assembly 4, continuous and stable extrusion can be achieved, which helps to reduce defects in the extruded products. The coaxial connection of the three sections forms an axial through channel, which helps to ensure uniform flow of raw materials during the entire extrusion process, thereby improving the uniformity and consistency of the products.

[0046] As shown in Figure 2 and 3 , the melting section 42 includes a sleeve 421, a scraping cylinder 423, a limiting groove 424, a sliding block 425, an adjusting groove 426, a protruding block 427, and a spring 428. The sleeve 421 is installed at the right end of the feeding section 41, and the scraping cylinder 423 is uniformly installed around the periphery of the sleeve 421. The center of the scraping cylinder 423 is provided with a through hole, and the through hole can pass through the sleeve 421. The protruding block 427 is installed on the through hole. The limiting groove 424 is formed on one side of the lower end of the scraping cylinder 423, and the sliding block 425 is slidably installed in the limiting groove 424. The adjusting groove 426 is formed on the other side of the scraping cylinder 423, and the spring 428 is connected to the adjusting groove 426. The spring 428 is used to change the offset of the scraping cylinder 423, so as to reduce the friction of the moving assembly 5 during movement.

[0047] The design of the scraping cylinder 423 allows it to uniformly surround the periphery of the sleeve 421, and the protruding block 427 ensures uniform spacing of the through hole. This helps to ensure that the raw materials are uniformly heated and stirred in the melting section 42, resulting in uniform molten materials that are beneficial to product quality. The combination of the limiting groove 424 and the sliding block 425 allows precise control of the position of the scraping cylinder 423. This can be used to adjust the flow and pressure of the raw materials during extrusion to meet the requirements of different products. The presence of the spring 428 allows adjustment of the offset of the scraping cylinder 423, reducing the friction of the moving assembly 5 during movement. This helps to improve the stability and life of the device and reduce energy consumption. Due to the design of the scraping cylinder 423 and the sliding block 425, the device can automatically adjust the working state of the melting section 42 to some extent, reducing the need for operator intervention and improving production efficiency.

[0048] As shown in Figure 7 and 8As shown, the slider 425 is a tapered cone with a narrow top and a wide bottom, and the top end of the slider 425 is designed with a rounded corner to facilitate the sliding out of the barrel 423. The cooperation between the limiting groove 424 and the slider 425 allows the melting section 42 to be better positioned when it is pressed by the moving assembly 5.

[0049] The design of the slider 425 allows it to better embed in the limiting groove 424, thereby providing stronger limiting effect. This helps to ensure that the melting section 42 maintains a stable position when it is pressed by the moving assembly 5, preventing unnecessary movement or shaking. With better limiting effect, it can ensure that the molten material in the melting section 42 maintains stable flow during extrusion, thereby improving the efficiency and consistency of extrusion. The combined design of the limiting groove 424 and the slider 425 not only improves performance, but also helps to reduce the maintenance requirements of the device, prolonging the service life of the equipment. Through the cooperation design of the slider 425 and the limiting groove 424, precise control of the position of the melting section 42 can be achieved. This helps to adjust the working parameters during extrusion to meet different product requirements.

[0050] As shown in Figure 2 and 3 The moving assembly 5 includes a hydraulic cylinder 51, a guide rod 52, a moving block 53, and a connecting key 54. The hydraulic cylinder 51 is installed in the feeding section 41, forming a sandwich between the hydraulic cylinder 51 and the feeding section 41. The output end of the hydraulic cylinder 51 is installed with the guide rod 52, and the other end of the guide rod 52 is installed with the connecting key 54. The connecting key 54 changes the melting section 42 from a static state to a rotating state, and the right end of the connecting key 54 is installed with the moving block 53.

[0051] The hydraulic cylinder 51 serves as the driving force source of the moving assembly 5, which can provide precise force and displacement control. This helps to ensure precise positioning and control when the melting section 42 in the screw assembly 4 changes from a static state to a rotating state, thereby achieving a highly precise extrusion process. The output force and displacement of the hydraulic cylinder 51 can be adjusted by controlling the hydraulic system to adapt to different extrusion requirements and product specifications. This flexibility makes the device more versatile. The hydraulic system can achieve fast or slow movement, depending on the required extrusion speed. This speed control helps to adapt to the extrusion speed requirements of different materials and products. Due to the precise control of the hydraulic cylinder 51, the device can achieve a highly stable extrusion process, ensuring the consistency and quality of the products. This also helps to reduce the scrap rate. The automated control of the hydraulic cylinder 51 makes the entire extrusion process easier to automate, reducing the need for operator intervention and improving production efficiency.

[0052] As shown in Figure 6As shown, the cross-sectional shape of the moving block 53 is "convex", which can reduce resistance so that the convex block 427 is lifted in stages, reducing the friction and resistance of the moving block during movement. The length of the moving block 53 is consistent with the length of the melting section 42.

[0053] Due to the shape of the "convex" moving block 53, the contact area with the wall surface is reduced during movement, thereby reducing the friction and resistance. This helps to reduce the energy consumption of the moving assembly 5 and improves the efficiency. The convex block 427 in the device can be lifted in stages during the movement of the moving block 53, which helps to push the molten material more evenly. Uniform pushing helps to achieve consistent extrusion molding and improves product quality. The length of the moving block 53 is consistent with the length of the melting section 42, which means that the moving block 53 can continuously provide a stable pushing force during extrusion, ensuring the stability and consistency of the extrusion process. Reducing friction and resistance means that the hydraulic system needs to consume less energy to push the moving block 53. This helps to save energy and reduce operating costs. Reducing the friction and resistance of the moving block 53 helps to prolong the service life of the moving block 53, reduces the maintenance requirements, and improves the reliability of the device.

[0054] As shown in Figure 2 and 3 The connecting key 54 is installed between the guide rod 52 and the moving block, which can move in the limiting groove 422 opened in the sleeve 421. The length of the limiting groove 422 is the sum of the length of the moving block 53 and the width of the two connecting keys 54.

[0055] The connecting key 54 can move in the limiting groove 422, and the length of the limiting groove 422 matches the sum of the length of the moving block 53 and the width of the two connecting keys 54. Such design ensures accurate position control of the guide rod 52 and the moving block 53, which helps to achieve accurate adjustment and consistency of the extrusion process. Due to the accurate position control, the guide rod 52 can ensure that the moving block 53 maintains a stable trajectory during movement. This helps to stabilize the extrusion molding process and reduce product unevenness. The design of the connecting key 54 and the limiting groove 422 reduces the friction between the guide rod 52 and the moving block 53, which helps to prolong the service life of the device and reduces the maintenance requirements. Accurate position control and stable extrusion process make the entire device easier to automate, reducing the need for operator intervention and improving production efficiency. By ensuring the accurate position of the moving block 53, the consistency and quality of the extruded product can be improved, and the scrap rate can be reduced.

[0056] As shown in Figure 9 The NBR-based rubber compound cold feed extrusion molding process described in the present application is as follows:

[0057] S1: the NBR base rubber and the required additives are mixed in a certain proportion, 60%-80% content of butyronitrile rubber is selected, the content of filler is controlled between 10%-30%, the content of plasticizer is controlled between 5%-15%, the content of vulcanizing agent is between 1%-5%, the content of accelerator and antioxidant is between 1%-3%;

[0058] S2: the staff sends the mixed raw materials into the feeding port 31, the motor 2 drives the feeding section 41 to start rotating, the auger of the feeding section 41 compresses and mixes the fed rubber, then the melting section 42 is preheated, at the same time, the hydraulic cylinder 51 pushes the moving assembly 5 to move towards the melting section 42, the moving block 53 gradually lifts the convex blocks 427 in a wave form, until the melting section 42 reaches 75-85℃, the connecting key 54 moves to the connection position of the feeding section 41 and the melting section 42.

[0059] S3: when the connecting key 54 moves to the connection position of the feeding section 41 and the melting section 42, the feeding section 41 can drive the melting section 42 and the extruding section 43 to rotate together, at the same time, the moving block 53 lifts the convex blocks 427, so that the convex blocks 427 can contact the inner wall of the cylinder 3, the resistance of the rubber through the melting section 42 increases, the elongated convex blocks 427 can fully mix the rubber, at the end of the melting section 42, all the rubber is melted and changes into viscous flow state, finally, under the pushing of the auger, the rubber realizes cold feeding extrusion.

[0060] In the working process of the present application, first, the staff starts the motor 2, at this time the motor 2 drives the feeding section 41 to start rotating, and the NBR base rubber and the required additives are put into the feeding port 31 on the cylinder 3 according to a certain proportion, the rubber is pushed to the head direction along the rotation of the screw assembly 4 after entering the cylinder 3 from the feeding port 31, first, the auger of the feeding section 41 compresses and mixes the feeding rubber, at this time the melting section 42 remains stationary and does not rotate, the protruding block 427 is in the middle of the cylinder 3, the rubber preliminarily treated by the feeding section 41 gradually accumulates at the connection between the feeding section 41 and the melting section 42, at this time the melting section 42 does not rotate, so the efficiency of conveying rubber is slowed down, the feeding section 41 can fully extrude and mix the rubber, then the melting section 42 is preheated, the hydraulic cylinder 51 starts to move and push the moving assembly 5 to start moving to the melting section 42, the moving block 53 gradually lifts the protruding block 427 in a wave shape in turn, until the melting section 4222 reaches 75-85℃, the connecting key 5433 moves to the connection between the feeding section 41 and the melting section 42, at this time the feeding section 41 can drive the melting section 42 to rotate together with the extruding section 43, at the same time the protruding block 427 is pushed out by the moving block 53, so that the protruding block 427 can contact the inner wall of the cylinder 3, the resistance of the rubber through the melting section 42 increases, and the elongated protruding block 427 can fully mix the rubber, at the end of the melting section 42, all the rubber is melted and changes into a viscous flow state, finally the molten material is quantitatively, constant-pressure and constant-temperature extruded into the head through the extruding section 43. In order for those of ordinary skill in the art to be able to implement or use the present disclosure, the description herein is provided.

[0061] Various modifications to the present disclosure will be apparent to those of ordinary skill in the art, and the general principles defined herein can be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but should be given the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cold-feed extrusion molding apparatus for NBR-based rubber compounds, comprising a chassis (1), a motor (2), and a cylinder (3), characterized in that: It also includes a screw assembly (4) and a moving assembly (5). The cylinder (3) has a feeding port (31) at the end near the motor (2). The cylinder (3) has an exhaust port (32) in the middle section. A cold water pipe (33) is also installed on the conveying cylinder (3). The screw assembly (4) is installed inside the cylinder (3). The moving assembly (5) is connected inside the screw assembly (4). The moving assembly (5) can control the melting section (42) in the screw assembly (4) to change from a static state to a rotating state, thereby pushing the material gathered in the melting section (42) away from the feeding port (31). The melting section (42) includes a sleeve (421), a limiting groove (422), a scraper (423), a limiting groove (424), a slider (425), an adjusting groove (426), a protrusion (427), and a spring (428). The right end of the feeding section (41) is equipped with a sleeve (421). The sleeve (421) has a limiting groove (422) inside. The sleeve (421) is equipped with a scraper (423) around its periphery. The scraper (423) is evenly surrounding the sleeve (421). The center of the scraper (423) has a through hole that can pass through the sleeve (421). A protrusion (427) is installed on the through hole. The moving component (5) includes a hydraulic cylinder (51), a guide rod (52), a connecting key (54), and a moving block (53); the hydraulic cylinder (51) is installed in the feeding section (41), and the output force and displacement of the hydraulic cylinder (51) are adjusted to control the extrusion process through the hydraulic system. A sandwich is formed between the hydraulic cylinder (51) and the feeding section (41). The output end of the hydraulic cylinder (51) is equipped with a guide rod (52), and the other end of the guide rod (52) is equipped with a connecting key (54). The connecting key (54) changes the melting section (42) from a static state to a rotating state. The right end of the connecting key (54) is equipped with a moving block (53). The cross-sectional shape of the moving block (53) is "convex". The "convex" shaped moving block (53) reduces resistance, allowing the protruding block (427) to be lifted in stages, and reduces the friction and resistance of the moving block (53) during the movement process. The length of the moving block (53) is consistent with the length of the melting section (42). The connecting key (54) moves within the limiting groove (422) opened in the sleeve (421); When the feed section (41) and the melting section (42) are connected by the connecting key (54), the feed section (41) can drive the melting section (42) and the extrusion section (43) to rotate together.

2. The NBR-based rubber cold-feed extrusion molding apparatus according to claim 1, characterized in that: The screw assembly (4) further includes a feeding section (41), a melting section (42), and an extrusion section (43); one end of the feeding section (41) is connected to the motor (2), the other end of the feeding section (41) is connected to one end of the melting section (42), and the other end of the melting section (42) is connected to the extrusion section (43); the screw assembly (4) consists of a feeding section (41), a melting section (42), and an extrusion section (43) from left to right; the feeding section (41), the melting section (42), and the extrusion section (43) are all hollow inside, and the three are coaxially connected to form an axially connected channel.

3. The NBR-based rubber cold-feed extrusion molding apparatus according to claim 2, characterized in that: A limiting groove (424) is provided on one side of the lower end of the scraper cylinder (423), and a slider (425) is slidably installed in the limiting groove (424). An adjustment groove (426) is provided on the other side of the scraper cylinder (423), and a spring (428) is engaged in the adjustment groove (426). The spring (428) is used to change the offset of the scraper cylinder (423) and reduce the friction of the moving component (5) during the movement process.

4. The NBR-based rubber cold-feed extrusion molding apparatus according to claim 3, characterized in that: The slider (425) is a cone that is narrow at the top and wide at the bottom, and the top of the slider (425) is opened into a rounded corner to facilitate the sliding out of the scraper (423). The limiting groove (424) cooperates with the slider (425) so that the molten section (42) can better play a limiting role when it is squeezed by the moving component (5), while ensuring that the molten material in the molten section (42) remains flowing during the extrusion process.

5. The NBR-based rubber cold-feed extrusion molding apparatus according to claim 1, characterized in that: A connecting key (54) is installed between the guide rod (52) and the moving block (53), and the length of the limiting groove (422) is the sum of the length of the moving block (53) and the width of the two connecting keys (54).

6. A cold-feed extrusion molding process for NBR-based rubber compounds, characterized in that: The process utilizes the NBR-based rubber cold-feed extrusion molding apparatus described in any one of claims 1 to 5, and the process flow is as follows: S1: Mix NBR-based rubber compound and required additives in a certain proportion, select 60%-80% nitrile rubber, control the filler content between 10%-30%, control the plasticizer content between 5%-15%, the vulcanizing agent between 1%-5%, and the accelerator and antioxidant content between 1%-3%. S2: The staff feeds the mixed raw materials into the feeding port (31), the motor (2) drives the feeding section (41) to start rotating, the auger of the feeding section (41) compresses and mixes the fed rubber material, and then preheats the melting section (42). At the same time, the hydraulic cylinder (51) pushes the moving component (5) to move towards the melting section (42), and the moving block (53) gradually pushes the protrusion (427) up in a wave-like manner until the melting section (42) reaches 75℃-85℃. Then the connecting key (54) moves to the connection between the feeding section (41) and the melting section (42). S3: When the feed section (41) and the melting section (42) are connected by the connecting key (54), the feed section (41) can drive the melting section (42) and the extrusion section (43) to rotate together. At the same time, the moving block (53) pushes out the protruding block (427), so that the protruding block (427) can contact the inner wall of the cylinder (3). The resistance of the rubber material through the melting section (42) increases, and the elongated protruding block (427) can fully mix the rubber material. At the end of the melting section (42), all the rubber material melts and turns into a viscous flow state. Finally, under the push of the auger, the rubber material is cold-fed and extruded.

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