A raw material multi-species synchronous production and on-line modification device

Abstract

This utility model discloses a device for simultaneous production and online modification of multiple raw material grades, including a final polymerization reactor and multiple extruders connected in parallel at the output end of the final polymerization reactor. Raw materials are fed into the final polymerization reactor, where a polymerization reaction generates a polymer melt, which is then fed into the extruders for final extrusion molding to produce the corresponding product. The parallel connection of the extruders in this utility model enables simultaneous production of multiple grades and supports rapid switching between different grades to meet diverse market demands. The coordinated use of the melt distribution valve and feeding device in this utility model achieves precise diversion and quantitative delivery of the raw material melt, as well as high-precision continuous quantitative supply of the modifier. Process parameters can be precisely adjusted according to production needs, achieving efficient and flexible multi-grade production.

Description

Technical Field

[0001] This utility model relates to the fields of chemical engineering and materials processing technology, and more specifically, to a device for simultaneous production and online modification of multiple grades of raw materials. Background Technology

[0002] Polymer materials have a wide range of applications; for example, polyester materials are widely used in fibers, films, and packaging. In the chemical and materials processing fields, raw materials often need to be modified to meet different application requirements. Traditional production and modification processes usually require multiple independent production lines or frequent equipment changes, resulting in low production efficiency, high equipment costs, and difficulty in quickly switching between different grades of products. Therefore, developing a device that can achieve online modification of a single raw material and simultaneous production of multiple grades is of great significance. Utility model patent CN204054609U discloses an online production device for a reciprocating single-screw extruder, which achieves light diffusion characteristics in products by adding different additives and adjusting the formulation. However, this utility model cannot solve the problem of simultaneous production and online modification of multiple grades of the same raw material. Utility Model Content

[0003] Existing chemical and material processing equipment is difficult to quickly switch between producing different grades of products from the same raw material. To overcome this deficiency, this utility model provides a device for simultaneous production and online modification of multiple grades of raw materials. It can produce multiple grades of products simultaneously or sequentially from the same raw material by switching different modifiers online and precisely adjusting the input ratio.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A device for simultaneous production and online modification of multiple raw material grades includes a final polymerization reactor and multiple extruders connected in parallel at the output end of the final polymerization reactor. Raw materials are fed into the final polymerization reactor, where a polymerization reaction generates a polymer melt, which is then fed into the extruders for final extrusion molding to produce the corresponding product. The extruders are designed in parallel, enabling simultaneous production of multiple grades and allowing for both operation and standby, facilitating switching and maintenance. The number of extruders can be increased in parallel as needed to meet production requirements.

[0005] Preferably, a melt booster pump is installed between the output end of the final polymerization reactor and the extruder. A melt distribution valve is connected downstream of the melt booster pump, and the extruder is connected to the output end of the melt distribution valve. The melt booster pump provides flow power for the melt output from the final polymerization reactor, and the melt distribution valve is the core component for achieving precise material distribution, distributing the melt to different extruders according to a preset ratio. It can achieve simultaneous output or rapid switching of multiple grades of production according to order requirements.

[0006] Preferably, the final polymerization reactor is connected to a melt discharge pipe with a valve. A portion of the melt obtained from polymerization in the final polymerization reactor is collected through the melt discharge pipe with a valve; this is unmodified pure material and does not undergo modification treatment.

[0007] Preferably, the extruder includes a barrel, a temperature control device, a feeding device, and a vacuum device. The temperature control device includes multiple zone heaters arranged along the axial direction of the barrel. The feeding device is connected to the barrel via a pipe, and the barrel is equipped with a vacuum port connected to the vacuum device. During simultaneous production of multiple grades of this raw material and operation of the online modification device, the modifier is fed into the barrel through the feeding device and mixed into the polymer melt. As it moves towards the extruder head, it is continuously heated by the zone heaters, causing the temperature to rise. The material softens upon heating and gradually melts through shearing, facilitating subsequent mixing, plasticizing, and extrusion molding. During simultaneous production of multiple grades of this raw material and operation of the online modification device, the vacuum device creates a vacuum through the vacuum port, maintaining a certain negative pressure within the system to remove low-boiling-point impurities and ensure the quality of the final product.

[0008] Preferably, the feeding device includes a liquid loss-in-weight scale and a powder loss-in-weight scale, both of which are connected to the extruder via their respective feed pipes. Solid particles and / or powder modifiers and liquid modifiers enter the barrel via the powder loss-in-weight scale and the liquid loss-in-weight scale, respectively.

[0009] Preferably, a melt feed metering pump is also installed between the melt distribution valve and the extruder. It is mainly used for the conveying, pressurizing, and metering of high-temperature, high-viscosity polymer melts. It can further pressurize the melt, ensuring that the melt enters the extruder with sufficient pressure, effectively blocking the effects of pressure and flow fluctuations, achieving stable flow delivery, and precise flow control can be achieved by adjusting the pump speed.

[0010] Preferably, the extrusion drive of the extruder is an electric motor.

[0011] Preferably, the extruder is a planetary screw extruder. The planetary screw extruder, through the meshing of the central screw and the planetary screws, significantly increases the melt surface area, allowing the material to melt and mix more uniformly during processing, and also resulting in higher heat transfer efficiency.

[0012] The beneficial effects of this utility model are: To better meet diverse market demands, the extruders in this invention are connected in parallel, enabling simultaneous production of multiple grades and supporting rapid switching between different grades to satisfy diverse market needs.

[0013] Production can be controlled more conveniently. The synergistic use of the melt distribution valve and the feeding device in this invention enables precise diversion and quantitative delivery of raw material melt, as well as high-precision continuous quantitative supply of modifier. Process parameters can be precisely adjusted according to production needs, achieving efficient and flexible production of multiple grades. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of one structure of the present utility model.

[0015] Figure 2 This is a schematic diagram of one structure of the extruder in this utility model.

[0016] Figure 3 This is a schematic diagram of an axial structure inside the barrel of this utility model.

[0017] Diagram description: 1-Polymerization final polymerization reactor, 2-Extruder, 3-Mel discharge pipe with valve, 4-Mel booster pump, 5-Mel distribution valve, 6-Barrel, 7-Feeding device, 8-Mel feed metering pump, 9-Mel conveying pipe, 10-Motor, 11-Vacuum port, 12-Zone heater, 13-Center screw, 14-Planetary screw. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] Example 1: like Figures 1 to 3As shown, a device for simultaneous production and online modification of multiple raw material grades includes a final polymerization reactor 1 and two extruders 2. The two extruders 2 are connected in parallel and connected to the output end of the final polymerization reactor 1 via a melt delivery pipe 9. A melt booster pump 4 is installed on the melt delivery pipe 9 between the output end of the final polymerization reactor 1 and the extruders 2. A melt distribution valve 5 is connected downstream of the melt booster pump 4. The melt delivery pipe 9 splits into two parallel diversion pipes at the output end of the melt distribution valve 5. Each diversion pipe is then connected to an extruder 2, and a melt feed metering pump 8 is connected to the diversion pipe. The melt distribution valve 5 includes a valve body and a valve core located within the valve body. The valve body sidewall has an inlet and an outlet, and the valve core has an outlet valve corresponding to the outlet. The melt distribution valve 5 receives the material flowing in through the melt booster pump 4, and then controls the diversion ratio by adjusting the position of the valve core, distributing the melt to different diversion pipes according to a preset ratio. The extruder 2 includes a barrel 6, a temperature control device, a feeding device 7, and a vacuum device. The barrel 6 is divided into five sections from the tail end to the front extrusion head, namely zone one, zone two, zone three, zone four, and zone five. Zone one is the feeding section, which is used for material conveying and preliminary compression. The barrel 6 corresponding to this section is equipped with a water cooling system. Zone two is the transition section, where the temperature is raised. The material in this section is softened by heat and gradually melts through shearing. Zone three is the planetary section, where the temperature is higher than the previous two zones. Zone five is the extrusion head.

[0020] The temperature control device includes five zone heaters 12, which are arranged axially along the barrel 6 and correspond one-to-one with the five sections. The melt conveying pipe 9 is connected to one zone of the barrel 6. The feeding device 7 includes a liquid loss-in-weight scale and a powder loss-in-weight scale, both of which are connected to the extruder 2 through their respective feed pipes, realizing communication between the feeding device 7 and the two zones of the barrel 6. The barrel 6 is provided with a vacuum port 11, which is connected to the vacuum device. In this embodiment, the vacuum device is an independent vacuum pump. The extruder 2 is a planetary screw extruder, with a central screw 13 as the driving screw. Ten small-diameter planetary screws 14 are arranged around the central screw 13 and mesh with it. These planetary screws can both rotate on their own axis and revolve around the central screw. The outer circumference of the planetary screws meshes with the helical teeth on the inner wall of the barrel 6. The central screw and planetary screw work together to mix and plasticize the material. The extruder 2 uses a motor 10 as the extrusion drive device, and the final polymerization kettle 1 is connected to a melt discharge pipe 3 with a valve.

[0021] The implementation principle of this device for simultaneous production and online modification of multiple grades of raw materials is as follows: Based on a production system of reactor-multi-screw parallel collaboration, online modification and simultaneous production of multiple grades are achieved. Motor 10 provides driving force. The temperature of each section of the temperature control device is set according to the material characteristics and process requirements. The polymer melt obtained from polymerization in the final polymerization reactor 1 is pressurized and transported by melt booster pump 4, entering melt distribution valve 5. Melt distribution valve 5 adjusts the melt channel area by changing the position of the valve core, thereby controlling the melt flow rate and completing the diversion into the diversion channel according to the set ratio. Then, it is separately propelled by melt feed metering pump 8. Melt feed metering pump 8 pushes the high-viscosity melt through rotating gears or screws, and the flow rate of the melt is monitored and controlled by a metering device, thereby realizing the delivery and metering of the melt, which then enters the barrels 6 of different extruders 2. Various modifying additives, such as plasticizers, anti-hydrolysis agents, and flame retardants, are classified and mixed evenly, and then fed into the second zone through the liquid loss-in-weight scale and powder loss-in-weight scale of the feeding device 7. The raw materials and additives are subjected to various forces such as compression, rolling, and shearing within the intermeshing and rotating screw teeth of the extruder 6, constantly being turned over and mixed. After being uniformly mixed, they are gradually pushed to the front of the screw and extruded from the extruder head. Simultaneously, the vacuum port 11 on the extruder 2 is connected to the vacuum system, which maintains a certain negative pressure inside the system during operation, removing low-boiling-point impurities.

[0022] Example 2: A device for simultaneous production and online modification of multiple grades of raw materials, differing from Embodiment 1, includes a polymerization final polymerization reactor 1 and four extruders 2. The four extruders 2 are connected in parallel and connected to the output end of the polymerization final polymerization reactor 1 via a melt conveying pipe 9. A melt booster pump 4 is installed on the melt conveying pipe 9 between the output end of the polymerization final polymerization reactor 1 and the extruders 2. A melt distribution valve 5 is connected downstream of the melt booster pump 4. The melt conveying pipe 9 splits into two parallel diversion pipes at the output end of the melt distribution valve 5. Each diversion pipe is then connected to an extruder 2, and a melt feed metering pump 8 is connected to the diversion pipe. The melt distribution valve 5 includes a valve body and a valve core located within the valve body. The valve body sidewall has an inlet and an outlet, and the valve core has an outlet valve corresponding to the outlet. The melt distribution valve 5 receives the material flowing in from the melt booster pump 4, and then controls the flow ratio by adjusting the valve core position, distributing the melt to different flow pipes according to a preset ratio. The extruder 2 includes a barrel 6, a temperature control device, a feeding device 7, and a vacuum device. The barrel 6 is divided into five sections from the tail end to the front extrusion head, namely zone one, zone two, zone three, zone four, and zone five. Zone one is the feeding section, used for material conveying and preliminary compression. The barrel 6 corresponding to this section is equipped with a water cooling system. Zone two is the transition section, where the temperature is slightly higher. The material in this zone softens under heat and gradually melts through shearing action. Zone three is the planetary section, with a higher temperature than the previous two zones. Zone five is the extrusion head.

[0023] The temperature control device includes five zone heaters 12, which are arranged axially along the barrel 6 and correspond one-to-one with the five sections. The melt conveying pipe 9 is connected to one zone of the barrel 6. The feeding device 7 includes a liquid loss-in-weight scale and a powder loss-in-weight scale, both of which are connected to the extruder 2 through their respective feed pipes, realizing communication between the feeding device 7 and the two zones of the barrel 6. The barrel 6 is provided with a vacuum port 11, which is connected to the vacuum device. In this embodiment, the vacuum device is an independent vacuum pump. The extruder 2 is a planetary screw extruder, with a central screw 13 as the driving screw. Ten small-diameter planetary screws 14 are arranged around the central screw 13 and mesh with it. These planetary screws can both rotate on their own axis and revolve around the central screw. The outer circumference of the planetary screws meshes with the helical teeth on the inner wall of the barrel 6. The central screw and planetary screw work together to mix and plasticize the material. The extruder 2 uses a motor 10 as the extrusion drive device, and the final polymerization kettle 1 is connected to a melt discharge pipe 3 with a valve. The rest is the same as in Example 1.

[0024] The implementation principle of this device for simultaneous production and online modification of multiple grades of raw materials is as follows: Based on a production system of reactor-multi-screw parallel collaboration, online modification and simultaneous production of multiple grades are achieved. Motor 10 provides driving force. The temperature of each section of the temperature control device is set according to the material characteristics and process requirements. The polymer melt obtained from polymerization in the final polymerization reactor 1 is pressurized and transported by melt booster pump 4, entering melt distribution valve 5. Melt distribution valve 5 adjusts the melt channel area by changing the position of the valve core, thereby controlling the melt flow rate and completing the diversion into the diversion channel according to the set ratio. Then, it is separately propelled by melt feed metering pump 8. Melt feed metering pump 8 pushes the high-viscosity melt through rotating gears or screws, and the flow rate of the melt is monitored and controlled by a metering device, thereby realizing the delivery and metering of the melt, which then enters the barrels 6 of different extruders 2. Various modifying additives, such as plasticizers, anti-hydrolysis agents, and flame retardants, are classified and mixed evenly, and then fed into the second zone through the liquid loss-in-weight scale and powder loss-in-weight scale of the feeding device 7. The raw materials and additives are subjected to various forces such as compression, rolling, and shearing within the intermeshing and rotating screw teeth of the extruder 6, constantly being turned over and mixed. After being uniformly mixed, they are gradually pushed to the front of the screw and extruded from the extruder head. Simultaneously, the vacuum port 11 on the extruder 2 is connected to the vacuum system, which maintains a certain negative pressure inside the system during operation, removing low-boiling-point impurities.

[0025] Example 3: A device for simultaneous production and online modification of multiple raw material grades includes a final polymerization reactor 1 and two extruders 2. The two extruders 2 are connected in parallel and connected to the output end of the final polymerization reactor 1 via a melt delivery pipe 9. A melt booster pump 4 is installed on the melt delivery pipe 9 between the output end of the final polymerization reactor 1 and the extruders 2. A melt distribution valve 5 is connected downstream of the melt booster pump 4. The melt delivery pipe 9 splits into two parallel diversion pipes at the output end of the melt distribution valve 5. Each diversion pipe is then connected to an extruder 2, and a melt feed metering pump 8 is connected to the diversion pipe. The melt distribution valve 5 includes a valve body and a valve core located within the valve body. The valve body has an inlet and an outlet on its side wall, and the valve core has an outlet valve at a corresponding position to the outlet. The melt distribution valve 5 receives the material flowing in from the melt booster pump 4, and then controls the diversion ratio by adjusting the position of the valve core, distributing the melt to different diversion pipes according to a preset ratio. The extruder 2 includes a barrel 6, a temperature control device, a feeding device 7, and a vacuum device. The barrel 6 is divided into five sections from the tail end to the front extrusion head, namely zone one, zone two, zone three, zone four, and zone five. Zone one is the feeding section, which is used for material conveying and preliminary compression. The barrel 6 corresponding to this section is equipped with a water cooling system. Zone two is the transition section, where the temperature is raised. The material in this section is softened by heat and gradually melts through shearing. Zone three is the planetary section, where the temperature is higher than the previous two zones. Zone five is the extrusion head.

[0026] The temperature control device includes five zone heaters 12, which are arranged axially along the barrel 6 and correspond one-to-one with the five sections. The melt conveying pipe 9 is connected to one zone of the barrel 6. The feeding device 7 includes a liquid loss-in-weight scale and a powder loss-in-weight scale, both of which are connected to the extruder 2 through their respective feed pipes, realizing communication between the feeding device 7 and the two zones of the barrel 6. The barrel 6 is provided with a vacuum port 11, which is connected to the vacuum device. In this embodiment, the vacuum device is an independent vacuum pump. The extruder 2 is a planetary screw extruder, with a central screw 13 as the driving screw. Ten small-diameter planetary screws 14 are arranged around the central screw 13 and mesh with it. These planetary screws can both rotate on their own axis and revolve around the central screw. The outer circumference of the planetary screws meshes with the helical teeth on the inner wall of the barrel 6. The central screw and planetary screw work together to mix and plasticize the material. Unlike Example 1, in this example, the extruder 2 uses a hydraulic motor as the extrusion drive device, that is, the final polymerization reactor 1 is connected to a melt discharge pipe 3 with a valve. The rest is the same as in Example 1.

[0027] The implementation principle of this device for simultaneous production and online modification of multiple grades of raw materials is as follows: Based on a production system of reactor-multi-screw parallel collaboration, online modification and simultaneous production of multiple grades are achieved. A hydraulic motor provides driving force. The temperature of each section of the temperature control device is set according to the material characteristics and process requirements. The polymer melt obtained from polymerization in the final polymerization reactor 1 is pressurized and transported by the melt booster pump 4, entering the melt distribution valve 5. The melt distribution valve 5 adjusts the melt channel area by changing the position of the valve core, thereby controlling the melt flow rate and completing the diversion into the diversion channel according to the set ratio. Then, it is separately propelled by the melt feed metering pump 8. The melt feed metering pump 8 pushes the high-viscosity melt through components such as rotating gears or screws, and the flow rate of the melt is monitored and controlled by a metering device, thereby realizing the delivery and metering of the melt, which then enters the barrel 6 of different extruders 2. Various modifying additives, such as plasticizers, anti-hydrolysis agents, and flame retardants, are classified and mixed evenly, and then fed into the second zone through the liquid loss-in-weight scale and powder loss-in-weight scale of the feeding device 7. The raw materials and additives are subjected to various forces such as compression, rolling, and shearing within the intermeshing and rotating screw teeth of the extruder 6, constantly being turned over and mixed. After being uniformly mixed, they are gradually pushed to the front of the screw and extruded from the extruder head. Simultaneously, the vacuum port 11 on the extruder 2 is connected to the vacuum system, which maintains a certain negative pressure inside the system during operation, removing low-boiling-point impurities.

Claims

1. A raw material multi-grade simultaneous production and on-line modification apparatus, characterized by, The application relates to a polymerization device The polymerization device comprises a polymerization reactor (1) and a plurality of extruders (2) connected in parallel to the output end of the polymerization reactor (1).

2. A raw material multi-grade simultaneous production and on-line modification apparatus according to claim 1, characterized in that the polymerization A melt booster pump (4) is arranged between the output end of the polymerization reactor (1) and the extruders (2), and a melt distribution valve (5) is connected downstream of the melt booster pump (4), and the extruders (2) are connected to the output end of the melt distribution valve (5).

3. A raw material multi-grade simultaneous production and on-line modification apparatus according to claim 1, characterized in that, A valve-equipped melt discharge pipe (3) is connected to the polymerization reactor (1).

4. A raw material multi-grade simultaneous production and on-line modification apparatus according to claim 1, characterized in that, The extruder (2) comprises a barrel (6), a temperature control device, a feeding device (7) and a vacuum device, the temperature control device comprises a plurality of sectional heaters (12) arranged along the axial direction of the barrel (6), the feeding device (7) is connected to the barrel (6) through a pipeline, and a vacuum extraction port (11) connected to the vacuum device is arranged on the barrel (6).

5. A raw material multi-grade simultaneous production and on-line modification apparatus according to claim 4, characterized in that, The feeding device (7) comprises a liquid loss weight scale and a powder loss weight scale, and the liquid loss weight scale and the powder loss weight scale are connected to the extruder (2) through respective corresponding feeding pipes.

6. A raw material multi-grade simultaneous production and on-line modification apparatus according to claim 1, characterized in that, A melt feeding metering pump (8) is further arranged between the melt distribution valve (5) and the extruder (2).

7. A raw material multi-grade simultaneous production and on-line modification apparatus according to claim 1, characterized in that, The extrusion driving device of the extruder (2) is a motor (10).

8. A raw material multi-grade simultaneous production and on-line modification apparatus according to any one of claims 1 to 7, characterized in that, The extruder (2) is a planetary screw extruder.

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