Dynamic preheating and mixing device for high-performance polyamide

Abstract

The utility model discloses a high-performance polyamide dynamic preheating mixing device which comprises a mixing tank provided with a feed port and a discharge port which are far away from each other; the heating assembly comprises a heating jacket and a heating tube nest, the heating jacket is arranged on the outer wall of the mixing tank, and the heating tube nest is arranged at the end, close to the discharging port, in the mixing tank and arranged around the axis of the mixing tank so that a stirring area can be formed in the center of the mixing tank; the stirring assembly is arranged at the other end of the mixing tank, one end of the stirring assembly extends into the mixing tank and is located in the stirring area, and the stirring assembly is used for stirring materials entering the mixing tank from the feeding port. The stirring assembly and the heating tube nest cooperatively operate, and the stirring assembly rotates to push the material to flow, so that the material located on the lower side of the heating tube nest penetrates through the heating tube nest from bottom to top to be fully mixed with the material on the upper side, and the material is promoted to form an efficient circular flow path in the mixing tank.

Description

Technical Field

[0001] This application relates to the field of materials processing equipment technology, and in particular to a high-performance polyamide dynamic preheating and mixing device. Background Technology

[0002] In modern industry, polyamides (such as nylon 6) are key synthetic polymers widely used in textiles, automobiles, electronics, and many other fields. In the polyamide production process, the uniform mixing of raw materials, additives, and recycled materials is a crucial step in ensuring the consistency and high quality of the final product.

[0003] However, in traditional mixing devices, the stirring components and heating structures operate independently, making coordinated operation impossible. The material flow path within the mixing tank is chaotic, hindering efficient circulation and resulting in low mixing efficiency. Short mixing times and the inability to buffer fluctuations in feed volume and temperature lead to uneven mixing and inconsistent product quality. Utility Model Content

[0004] The purpose of this application is to provide a high-performance polyamide dynamic preheating and mixing device, comprising:

[0005] A mixing tank having a feed inlet and a discharge outlet that are far apart;

[0006] The heating assembly includes a heating jacket and heating tubes. The heating jacket is disposed on the outer wall of the mixing tank, and the heating tubes are disposed inside the mixing tank near the discharge port and arranged around the axis of the mixing tank to form a stirring zone at its center.

[0007] A stirring assembly is located at the other end of the mixing tank. One end of the stirring assembly extends into the mixing tank and is located in the stirring zone. It is used to stir the material entering the mixing tank from the feed inlet, so that the material located on the lower side of the heating tube passes through the heating tube from bottom to top and mixes with the material on the upper side of the heating tube.

[0008] As an optional embodiment, the mixing tank is arranged vertically, the heating jacket includes an upper jacket and a lower jacket, the upper jacket is disposed on the upper outer wall of the mixing tank, the lower jacket is disposed on the lower outer wall of the mixing tank, and the heating tubes are disposed on the middle inner wall of the mixing tank.

[0009] The upper jacket and the lower jacket have the same structure and are respectively provided with a jacket, an inlet communicating with the jacket and an outlet communicating with the jacket. The heating medium enters from the inlet and fills the jacket to heat the tank wall of the mixing tank and flows out from the outlet.

[0010] As an optional embodiment, the heating tube array includes a plurality of vertically arranged heat exchange tubes connected in sequence, and the gap between the plurality of heat exchange tubes forms a reflux channel so that the material located on the lower side of the heat exchange tube can flow back to the upper side of the heat exchange tube through the reflux channel.

[0011] Multiple heat exchange tubes are connected in sequence to form a heat exchange channel. The heating medium enters from the inlet of the heat exchange channel and fills the heat exchange channel to heat the material in the mixing tank that is in contact with the heat exchange tubes, and flows out from the outlet of the heat exchange channel.

[0012] As an optional embodiment, the inlet of the upper jacket, the inlet of the lower jacket, and the inlet of the heat exchange channel are connected to the heat medium channel through a first connecting component. The heat medium channel is used to transport the heating medium. The outlet of the upper jacket, the outlet of the lower jacket, and the outlet of the heat exchange channel are connected to the circulation channel through a second connecting component. The circulation channel is used to recover the heating medium.

[0013] As an optional embodiment, the feed inlet is provided with a main feed pipe, and one end of the main feed pipe extending into the mixing tank is provided with an annular pipe. The annular pipe is provided with multiple feed branch pipes on its wall. One end of the feed branch pipe extends toward the heating tubes, and a three-splash distributor is provided at that end to disperse the material entering the mixing tank through the main feed pipe, the annular pipe and the feed branch pipes.

[0014] As an optional embodiment, the mixing tank is also equipped with a level gauge, which is used to detect the liquid level height of the material in the mixing tank.

[0015] As an optional embodiment, the mixing tank is also equipped with a pressure gauge, which is used to detect the pressure of the material inside the mixing tank.

[0016] As an optional embodiment, the mixing tank is also provided with an interface for communicating with a spray reflux tower, which receives the water vapor generated in the mixing tank and condenses the caprolactam in the water vapor.

[0017] As an optional embodiment, the mixing tank is further provided with a first thermometer and a second thermometer. The first thermometer is located inside the mixing tank and near the interface, and is used to detect the temperature of the gas phase inside the mixing tank. The second thermometer is located inside the mixing tank and near the discharge port, and is used to detect the temperature of the liquid phase inside the mixing tank.

[0018] As an optional embodiment, the mixing tank is further provided with a third thermometer and a fourth thermometer. The third thermometer is located inside the mixing tank and above the heating tubes, and is used to detect the temperature of the gas phase or liquid phase inside the mixing tank. The fourth thermometer is located inside the mixing tank and between the third thermometer and the heating tubes, and is used to detect the temperature of the liquid phase inside the mixing tank. The temperature difference detected by the third thermometer and the fourth thermometer is used to determine the liquid level of the material inside the mixing tank.

[0019] The beneficial effects of the embodiments of this application are as follows:

[0020] The stirring assembly and the heating tubes of this application work together. The rotation of the stirring assembly drives the material flow, so that the material located on the lower side of the heating tubes passes through the heating tubes from bottom to top and is fully mixed with the material on the upper side, thus promoting the formation of an efficient circulation flow path of the material in the mixing tank.

[0021] During the circulation process, the material flow rate in the mixing zone is relatively fast, which effectively prolongs the mixing time of the material in the mixing tank, while also providing a good buffering and balancing effect on the feed rate and temperature fluctuations. Compared with traditional mixing technology, this greatly improves the uniformity of material mixing and significantly enhances mixing efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the high-performance polyamide dynamic preheating and mixing device according to an embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the layout of the mixing tank and heat exchange tubes according to an embodiment of this application;

[0024] Figure 3 This is a schematic diagram of the feed pipe at the feed inlet in an embodiment of this application.

[0025] in,

[0026] 1. Mixing tank; 11. Inlet; 12. Outlet; 13. Main feed pipe; 14. Circular pipe; 15. Branch feed pipe; 21. Upper jacket; 22. Lower jacket; 23. Heat exchanger tube; 24. Stirring zone; 25. Reflux channel; 26. Heat exchanger channel; 3. Stirring assembly; 4. Level gauge; 5. Pressure gauge; 6. Interface; 71. First thermometer; 72. Second thermometer; 73. Third thermometer; 74. Fourth thermometer; 8. Sight glass. Detailed Implementation

[0027] Various embodiments and features of this application are described herein with reference to the accompanying drawings.

[0028] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this application will be apparent to those skilled in the art.

[0029] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0030] These and other features of this application will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0031] It should also be understood that although this application has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this application.

[0032] The above and other aspects, features and advantages of this application will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0033] Specific embodiments of this application are described thereafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this application, which can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure the application. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as the basis and representative basis for the claims to teach those skilled in the art to use this application in a variety of substantially any suitable detailed structures.

[0034] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to this application.

[0035] An embodiment of this application provides a high-performance polyamide dynamic preheating and mixing device, such as... Figure 1 and Figure 2 As shown, it includes a mixing tank 1, a heating component, and a stirring component 3.

[0036] The mixing tank 1 is provided with a feed inlet 11 and a discharge outlet 12 located far apart. The material enters through the feed inlet 11 and is discharged through the discharge outlet 12 after a mixing process. The outer wall of the mixing tank 1 is provided with a heat insulation layer, the thickness of which is not less than 300 mm.

[0037] The heating assembly includes a heating jacket and heating tubes. The heating jacket is disposed on the outer wall of the mixing tank 1, and the heating tubes are disposed inside the mixing tank 1 near the discharge port 12, and are arranged around the axis of the mixing tank 1 to form a stirring zone 24 at its center. The heating assembly can heat the material to a suitable temperature, which is beneficial for subsequent mixing and other processes. For example, the heating assembly can control the temperature from 210 to 250°C according to production needs. The flow rate of the heating medium has a direct impact on the stability of the material temperature, so the flow rate of the heating medium is controlled at 5 to 15 times the material feed flow rate.

[0038] The stirring assembly 3 is located at the other end of the mixing tank 1. One end of the stirring assembly 3 extends into the mixing tank 1 and is located within the stirring zone 24. It is used to stir the material entering the mixing tank 1 from the feed inlet 11, so that the material located below the heating tube passes through the heating tube from bottom to top and mixes with the material above the heating tube. The stirring assembly 3 is a push-type stirrer, which is used for the circulating mixing of raw materials, additives, and recycled materials.

[0039] In this application, the material enters the mixing tank 1 through the feed inlet 11, and the stirring component 3 starts working, pushing the material to flow and stir within the mixing tank 1. Due to the drive of the stirring component 3, the material located below the heating tube continuously passes through the heating tube from bottom to top and mixes with the material above it (which can be the newly fed material entering through the discharge outlet 12). This cyclic mixing is carried out continuously without interruption. At the same time, the heating component heats the material.

[0040] Under the mixing and pushing of the stirring component 3, the material will gather and flow at the discharge port 12. During the continuous discharge process, a portion of the material is discharged stably according to the liquid level. The material that is not discharged will re-enter the mixing and preheating cycle under the continuous thrust.

[0041] During this process, the pressure of the material located on the lower side of the mixing zone 24 is greater than that of the material located on the upper side of the heating tube, and the flow velocity of the material located in the mixing zone 24 is higher than that of the material flowing through the heating tube. This effectively prolongs the mixing of materials between different time periods. By mixing the new and subsequent materials, the ratio fluctuations and temperature fluctuations during feeding are effectively balanced.

[0042] The materials used in this application are raw materials, additives, and recycled materials. These materials undergo hydrolysis and addition reactions under a pressure of 2-5 bar and a temperature of 210-240℃. This equipment mixes and preheats the materials, making the initial addition reaction more uniform and effectively improving the reaction rate and product quality. Specifically, this application achieves dynamic preheating and mixing of the materials through the cooperation of the stirring component 3 and the heating component, resulting in more uniform mixing and better preheating, which is beneficial for improving the performance of polyamide products.

[0043] In one embodiment, such as Figure 1 As shown, the mixing tank 1 is arranged vertically, and the heating jacket includes an upper jacket 21 and a lower jacket 22. The upper jacket 21 is provided on the upper outer wall of the mixing tank 1, and the lower jacket 22 is provided on the lower outer wall of the mixing tank 1. The heating tubes are provided on the middle inner wall of the mixing tank 1.

[0044] The upper jacket 21 and the lower jacket 22 have the same structure and are respectively provided with a jacket, an inlet communicating with the jacket, and an outlet communicating with the jacket. The heating medium enters from the inlet and fills the jacket to heat the tank wall of the mixing tank 1, and flows out from the outlet. The space of the jacket is set between 2-5 cm.

[0045] In this embodiment, the heating medium is typically a mixture of biphenyl and diphenyl ether. Biphenyl and diphenyl ether have high boiling points, good thermal stability, and low vapor pressures, enabling them to provide stable heat transfer at higher temperatures and are less prone to decomposition or deterioration during heating.

[0046] In this application, the heating medium enters the upper jacket 21 and lower jacket 22 through corresponding inlets to uniformly heat different parts of the mixing tank 1, and then flows out from their respective outlets. The upper jacket 21 and lower jacket 22 are used to ensure the temperature of the material in the upper and lower parts of the mixing tank 1, respectively, to prevent heat loss.

[0047] This application divides the heating jacket into an upper jacket 21 and a lower jacket 22, which allows for more precise heating control of different parts of the mixing tank 1 as needed, thereby improving the uniformity and flexibility of heating.

[0048] In one embodiment, such as Figure 1 and Figure 2 As shown, the heating tube array includes a plurality of vertically arranged heat exchange tubes 23 connected in sequence. The gap between the plurality of heat exchange tubes 23 forms a reflux channel 25 so that the material located on the lower side of the heat exchange tube 23 can flow back to the upper side of the heat exchange tube 23 through the reflux channel 25.

[0049] Multiple heat exchange tubes 23 are connected in sequence to form a heat exchange channel 26. The heating medium enters from the inlet of the heat exchange channel 26 and fills the heat exchange channel 26 to heat the material in the mixing tank 1 that is in contact with the heat exchange tubes 23, and flows out from the outlet of the heat exchange channel 26.

[0050] The heat exchange tube 23 can have a diameter of φ32-φ46mm and is made of stainless steel. When the diameter of the heat exchange tube 23 is φ32mm, the center distance between multiple heat exchange tubes 23 is set to 45mm. The heat exchange channel 26 can have 1-6 inlets and outlets respectively to achieve more uniform temperature control.

[0051] In this embodiment, the heating medium enters from the inlet of the heat exchange channel 26, filling the heat exchange channel 26 and heating the material in contact with the heat exchange tube 23. The material circulates through the return channel 25 under the action of stirring, realizing heat transfer and mixing.

[0052] The design of the heat exchange tube 23 and the reflux channel 25 in this application increases the contact area and contact time between the material and the heating medium, thereby improving heating efficiency and mixing effect.

[0053] In one embodiment, such as Figure 1 As shown, the inlet of the upper jacket 21, the inlet of the lower jacket 22, and the inlet of the heat exchange channel 26 are connected to the heat medium channel through a first connecting component. The heat medium channel is used to transport the heating medium. The outlet of the upper jacket 21, the outlet of the lower jacket 22, and the outlet of the heat exchange channel 26 are connected to the circulation channel through a second connecting component. The circulation channel is used to recover the heating medium.

[0054] In this embodiment, the first connecting component and the second connecting component can be a four-way connector and a valve. The heating medium flows in the heat medium channel, enters the inlet of the upper jacket 21, the lower jacket 22 and the heat exchange channel 26 through the first connecting component, heats the mixing tank 1, flows out from the outlet, enters the circulation channel through the second connecting component, and then returns to the heat medium channel for recycling.

[0055] This application achieves the recycling of the heating medium by setting up connecting components and channels, thereby improving energy utilization and reducing production costs.

[0056] In one embodiment, such as Figure 1 and Figure 3 As shown, the feed inlet 11 is provided with a feed main pipe 13, and one end of the feed main pipe 13 that extends into the mixing tank 1 is provided with an annular pipe 14. The annular pipe 14 is provided with a plurality of feed branch pipes 15 on its pipe wall. One end of the feed branch pipe 15 extends toward the direction close to the heating tube, and a three-splash distributor is provided at this end to disperse the material entering the mixing tank 1 through the feed main pipe 13, the annular pipe 14 and the feed branch pipes 15.

[0057] In this embodiment, the main feed pipe 13 is used to introduce materials into the mixing tank 1. The annular pipe 14 is connected to the end of the main feed pipe 13 that extends into the mixing tank 1, serving to disperse the materials and allow them to be more evenly distributed within the mixing tank 1. The feed branch pipe 15 is connected to the annular pipe 14, guiding the materials from the annular pipe 14 to a position near the heating tubes for further dispersion. A three-splash distributor is located at one end of the feed branch pipe 15, dispersing the materials entering the mixing tank 1 in multiple directions, ensuring more even distribution and improving the mixing effect.

[0058] In this application, the material enters from the main feed pipe 13, flows through the annular pipe 14 and the feed branch pipe 15, and finally disperses into the mixing tank 1 through the three-splash distributor.

[0059] This application, through the reasonable design of the feed inlet 11, enables the material to enter the mixing tank 1 evenly, which is beneficial to improving the uniformity and efficiency of mixing.

[0060] In one embodiment, such as Figure 1 As shown, the mixing tank 1 is also equipped with a level gauge 4, which is used to detect the liquid level of the material in the mixing tank 1 so that the operator can know the amount of material in the tank and prevent the material from overflowing or being insufficient.

[0061] The level gauge 4 monitors the liquid level of the material in the mixing tank 1 in real time and displays the liquid level information. During the repeated mixing and preheating process, new raw materials, additives, and recycled materials are continuously added through the feed inlet 11, and materials are continuously discharged through the discharge outlet 12 according to the changes in liquid level.

[0062] This application utilizes the level gauge 4 to effectively control the amount of material in the mixing tank 1, ensuring the safety and stability of the production process.

[0063] In one embodiment, such as Figure 1 As shown, the mixing tank 1 is also equipped with a pressure gauge 5, which is used to detect the pressure of the material inside the mixing tank 1. The pressure gauge 5 is located on the upper side of the mixing tank 1, and its detection of the material pressure inside the mixing tank 1 helps prevent excessively high or low pressure from affecting production.

[0064] Pressure gauge 5 measures the pressure of the material in mixing tank 1 in real time and displays the pressure information. When the pressure in mixing tank 1 exceeds the set value, it indicates a potential problem that needs to be investigated promptly, such as checking for blockages in the pipeline.

[0065] The pressure gauge 5 in this application is set to ensure that the mixing tank 1 operates within a suitable pressure range, avoiding safety accidents or affecting product quality due to abnormal pressure.

[0066] In one embodiment, such as Figure 1As shown, the mixing tank 1 is also provided with an interface 6 for communicating with the spray reflux tower. The spray reflux tower receives the water vapor generated in the mixing tank 1 and condenses the caprolactam in the water vapor.

[0067] In this embodiment, interface 6 allows the water vapor generated during the heating process of the material in mixing tank 1 to enter the spray reflux tower. After receiving the water vapor generated in mixing tank 1, the spray reflux tower condenses the caprolactam in the water vapor to achieve the recovery and utilization of caprolactam.

[0068] This application achieves the recovery of caprolactam from the water vapor generated in the mixing tank 1 by setting up interface 6 and a spray reflux tower, thereby improving the utilization rate of raw materials and reducing environmental pollution.

[0069] In one embodiment, such as Figure 1 As shown, the mixing tank 1 is also equipped with a first thermometer 71 and a second thermometer 72. The first thermometer 71 is located inside the mixing tank 1 and near the interface 6, and is used to detect the temperature of the gas phase inside the mixing tank 1. The second thermometer 72 is located inside the mixing tank 1 and near the discharge port 12, and is used to detect the temperature of the liquid phase inside the mixing tank 1.

[0070] In this embodiment, the temperature of the gas phase inside the mixing tank 1 detected by the first thermometer 71 helps the operator understand the thermal state of the gas phase inside the mixing tank 1 and determine whether the heating and other processes are normal. The temperature of the liquid phase inside the mixing tank 1 detected by the second thermometer 72 helps the operator understand the temperature of the material at the time of discharge and ensure product quality.

[0071] This application utilizes two thermometers to monitor the temperatures of the gas and liquid phases within the mixing tank 1, which helps to precisely control the production process and improve product quality.

[0072] In one embodiment, such as Figure 1 As shown, the mixing tank 1 is also equipped with a third thermometer 73 and a fourth thermometer 74. The third thermometer 73 is located inside the mixing tank 1 and above the heating tubes, and is used to detect the temperature of the gas phase or liquid phase inside the mixing tank 1. The fourth thermometer 74 is located inside the mixing tank 1 and between the third thermometer 73 and the heating tubes, and is used to detect the temperature of the liquid phase inside the mixing tank 1. The temperature difference detected by the third thermometer 73 and the fourth thermometer 74 is used to determine the liquid level of the material inside the mixing tank 1.

[0073] In this embodiment, the temperature of the gas or liquid phase inside the mixing tank 1 detected by the third thermometer 73 provides a basis for judging the material state. The temperature of the material above the heating tube can be determined by the third thermometer 73. The temperature of the liquid phase inside the mixing tank 1 detected by the fourth thermometer 74, combined with the temperature difference detected by the third thermometer 73, can determine the liquid level of the material inside the mixing tank 1. For example, the temperature of the liquid phase near the heating tube can be known by the fourth thermometer 74, and by comparing it with the temperature of the third thermometer 73, the liquid level of the material can be calculated.

[0074] The third thermometer 73 and the fourth thermometer 74 monitor the temperature at their respective locations in real time, and infer the liquid level of the material by measuring the temperature difference between them. When the temperature difference detected by the third thermometer 73 and the fourth thermometer 74 changes, it indicates that the liquid level of the material may have changed, and the production operation can be adjusted in time, such as adjusting the feed flow rate at the inlet 11 or the discharge flow rate at the outlet 12.

[0075] This application, through the installation of a third thermometer 73 and a fourth thermometer 74, allows for a more accurate understanding of the temperature distribution and liquid level of the materials within the mixing tank 1, which helps optimize the production process and improve production efficiency and product quality. In one embodiment, the mixing tank 1 is also equipped with a sight glass 8, which is located at the top of the mixing tank 1 and is used by operators to observe the mixing status of the materials within the mixing tank 1. A gasket is provided between the sight glass 8 and the outer wall of the mixing tank 1, wherein the sight glass 8 is made of 500-degree high-temperature resistant glass, and the gasket is made of high-temperature resistant flexible graphite gasket or mica gasket.

[0076] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A high performance polyamide dynamic preheat mixing device characterized by, include: A mixing tank having a feed inlet and a discharge outlet that are far apart; The heating assembly includes a heating jacket and heating tubes. The heating jacket is disposed on the outer wall of the mixing tank, and the heating tubes are disposed inside the mixing tank near the discharge port and arranged around the axis of the mixing tank to form a stirring zone at its center. A stirring assembly is located at the other end of the mixing tank. One end of the stirring assembly extends into the mixing tank and is located in the stirring zone. It is used to stir the material entering the mixing tank from the feed inlet, so that the material located on the lower side of the heating tube passes through the heating tube from bottom to top and mixes with the material on the upper side of the heating tube.

2. The high performance polyamide dynamic preheat mixing device of claim 1, wherein, The mixing tank is arranged vertically, and the heating jacket includes an upper jacket and a lower jacket. The upper jacket is located on the upper outer wall of the mixing tank, and the lower jacket is located on the lower outer wall of the mixing tank. The heating tubes are located on the middle inner wall of the mixing tank. The upper jacket and the lower jacket have the same structure and are respectively provided with a jacket, an inlet communicating with the jacket and an outlet communicating with the jacket. The heating medium enters from the inlet and fills the jacket to heat the tank wall of the mixing tank and flows out from the outlet.

3. The high performance polyamide dynamic preheat mixing device of claim 2, wherein, The heating tube array includes multiple vertically arranged heat exchange tubes connected in sequence. The gaps between the multiple heat exchange tubes form a reflux channel, so that the material located on the lower side of the heat exchange tube can flow back to the upper side of the heat exchange tube through the reflux channel. Multiple heat exchange tubes are connected in sequence to form a heat exchange channel. The heating medium enters from the inlet of the heat exchange channel and fills the heat exchange channel to heat the material in the mixing tank that is in contact with the heat exchange tubes, and flows out from the outlet of the heat exchange channel.

4. The high performance polyamide dynamic preheat mixing device of claim 3, wherein, The inlet of the upper jacket, the inlet of the lower jacket, and the inlet of the heat exchange channel are connected to the heat medium channel through a first connecting component. The heat medium channel is used to transport the heating medium. The outlet of the upper jacket, the outlet of the lower jacket, and the outlet of the heat exchange channel are connected to the circulation channel through a second connecting component. The circulation channel is used to recover the heating medium.

5. The high performance polyamide dynamic preheat mixing device of claim 1, wherein, The feed inlet is provided with a main feed pipe, and one end of the main feed pipe that extends into the mixing tank is provided with an annular pipe. Multiple feed branch pipes are provided on the wall of the annular pipe. One end of the feed branch pipe extends towards the heating tube and is provided with a three-splash distributor to disperse the material entering the mixing tank through the main feed pipe, the annular pipe and the feed branch pipe.

6. The high performance polyamide dynamic preheat mixing device of claim 1, wherein, The mixing tank is also equipped with a level gauge, which is used to detect the liquid level height of the material inside the mixing tank.

7. The high performance polyamide dynamic preheat mixing device of claim 1, wherein, The mixing tank is also equipped with a pressure gauge, which is used to detect the pressure of the material inside the mixing tank.

8. The high performance polyamide dynamic preheat mixing device of claim 1, wherein, The mixing tank is also provided with an interface for communicating with the spray reflux tower, which receives the water vapor generated in the mixing tank and condenses the caprolactam in the water vapor.

9. The high performance polyamide dynamic preheat mixing device of claim 8, wherein, The mixing tank is also equipped with a first thermometer and a second thermometer. The first thermometer is located inside the mixing tank and near the interface, and is used to detect the temperature of the gas phase inside the mixing tank. The second thermometer is located inside the mixing tank and near the discharge port, and is used to detect the temperature of the liquid phase inside the mixing tank.

10. The high performance polyamide dynamic preheat mixing device of claim 1, wherein, The mixing tank is also equipped with a third thermometer and a fourth thermometer. The third thermometer is located inside the mixing tank and above the heating tubes, and is used to detect the temperature of the gas phase or liquid phase inside the mixing tank. The fourth thermometer is located inside the mixing tank and between the third thermometer and the heating tubes, and is used to detect the temperature of the liquid phase inside the mixing tank. The temperature difference detected by the third thermometer and the fourth thermometer is used to determine the liquid level of the material inside the mixing tank.

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