Lyocell fiber swelling machine

Abstract

The application discloses a lyocell fiber swelling machine and relates to the technical field of mixing devices.The lyocell fiber swelling machine comprises a premixing barrel, a stirring device and a heat preservation system, the premixing barrel is provided with a feeding port for feeding slurry and a discharging port for discharging slurry, the stirring device comprises a first driving member and a stirring screw, the first driving member is arranged outside the premixing barrel and located at the bottom of the premixing barrel, the bottom end of the stirring screw is in transmission connection with the first driving member and is rotatably arranged in the premixing barrel, the stirring screw is used for mixing materials, the top end of the stirring screw is provided with a counterweight, the counterweight is used for keeping the dynamic balance of the stirring screw during operation and reducing vibration generated during high-speed disintegration of slurry pulp.The lyocell fiber swelling machine disclosed by the application reduces the conveying links of slurry pulp, maximally reduces the risk of impurities entering the system, upgrades traditional indirect dissolution to high-efficiency direct dissolution, thereby improving production efficiency and significantly improving the stability of the original liquid system.

Description

Technical Field

[0001] This application relates to the field of mixing equipment technology, and more specifically, to a Lyocell fiber swelling machine. Background Technology

[0002] Lyocell fiber is an environmentally friendly solvent-based cellulose fiber with superior performance, combining the advantages of both natural and synthetic fibers: it possesses the comfort and breathability of cotton, the luster and feel of silk, and the high strength of synthetic fibers and the crispness of wool. This fiber has strong affinity with various natural fibers and can be blended in any proportion, making it an ideal raw material for developing high-value-added woven and knitted products with broad market prospects. Compared to cotton fiber, lyocell fiber not only has similar properties but also excels in moisture absorption and color vibrancy. With its excellent cohesion, it effectively improves the structure and properties of yarns and fabrics, and its applications span various fields including industry, agriculture, and clothing.

[0003] The preparation process of lyocell fiber mainly includes pulp conveying, premixing, spinning solution preparation, and solution filtration and conveying. Among these processes, the operational stability of the premixing section directly affects the quality of the final spinning solution. The task of this section is to mix the pulverized pulp with additives to form a slurry that can swell. However, the current production process is extremely complex: the pulp sheet must pass through multiple devices sequentially, including a hopper, a single spiral, a pre-weighing hopper, a double spiral, and a belt scale, before finally entering the horizontal premixer. This lengthy conveying chain results in numerous devices and dense control points, making process control difficult, operationally unstable, and directly causing uneven mixing and poor swelling of the slurry.

[0004] Therefore, how to ensure the mixing and swelling effect of the porridge to improve the stability of the original solution production has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a lyocell fiber swelling machine to ensure the mixing and swelling effect of porridge and improve the stability of raw solution production.

[0006] A lyocell fiber swelling machine, comprising:

[0007] A premixing tank is provided with an inlet and an outlet, an additive pipeline is connected to the premixing tank, and an insulation coil is provided on the outer wall of the premixing tank.

[0008] A mixing device, comprising a first driving member and a mixing screw, wherein the first driving member is disposed outside the premixing tank and located at the bottom of the premixing tank, the bottom end of the mixing screw is connected to the first driving member in a transmission manner, the mixing screw is rotatably disposed inside the premixing tank for mixing materials, and a counterweight is disposed at the top end of the mixing screw;

[0009] A heat preservation system, which is connected to the heat preservation coil, is used to supply heat medium to the heat preservation coil.

[0010] In some embodiments, the top end of the stirring screw is provided with a stepped structure, the stepped structure having a stepped surface facing away from the first driving member, and the counterweight is sleeved on the top end of the stirring screw and arranged in close contact with the stepped surface.

[0011] In some embodiments, a discharge system is provided at the discharge port, the discharge system including a discharge valve communicating with the discharge port, and a discharge pipe and a discharge pump sequentially communicating with the discharge valve.

[0012] In some embodiments, the discharge pipe is provided with a first insulation jacket, the first insulation jacket is connected to the insulation system, and the insulation system is used to supply heat medium to the first insulation jacket.

[0013] In some embodiments, the discharge pump is provided with a second insulation jacket, and the discharge valve is provided with a third insulation jacket. Both the second insulation jacket and the third insulation jacket are connected to the insulation system, and the insulation system is used to supply heat medium to the second insulation jacket and the third insulation jacket.

[0014] In some embodiments, the insulation system includes:

[0015] A plate heat exchanger, wherein the plate heat exchanger has a heat source pipeline and an insulation pipeline, the heat source pipeline is connected to a heat source, and the insulation pipeline is connected to an insulation coil to form an insulation circulation loop;

[0016] A heat-insulating water pump is connected in series in the heat-insulating circulation loop.

[0017] In some embodiments, a control valve is provided on the heat source pipeline, and a temperature sensor is provided at the outlet of the insulation pipeline. The control valve controls its opening degree based on the temperature data from the temperature sensor.

[0018] In some embodiments, it also includes:

[0019] Multiple scrapers are rotatably disposed inside the premixing tank for scraping the bottom wall of the premixing tank, and the scrapers are arranged on the same axis as the stirring screw.

[0020] The second driving component is disposed outside the premixing tank and located at the bottom of the premixing tank, and the second driving component is connected to the scraper drive.

[0021] In some embodiments, the end of the spiral structure of the stirring screw is a serrated structure;

[0022] And / or, the end of the scraper has a serrated structure.

[0023] In some embodiments, the edge of the spiral structure of the stirring screw is provided with a baffle, and the baffle is arranged inclined downward relative to the horizontal direction from the direction close to the central axis of the stirring screw to the direction away from the central axis of the stirring screw.

[0024] In some embodiments, a nitrogen pipeline is also included, wherein the inlet end of the nitrogen pipeline is connected to a nitrogen source, and the outlet end of the nitrogen pipeline is connected to the premixing tank.

[0025] In some embodiments, the premix tank includes:

[0026] The barrel body, the stirring screw is rotatably disposed in the barrel body, the first driving member is disposed outside the barrel body and passes through the bottom of the barrel body and is connected to the stirring screw for transmission, and the discharge port is opened at the bottom of the barrel body;

[0027] A bucket lid is provided at the top of the bucket body and includes a manhole, an observation hole, and a feed inlet.

[0028] The lyocell fiber swelling machine provided in this application includes a premixing tank, a stirring device, and a heat preservation system. The premixing tank is equipped with an inlet for feeding pulp and an outlet for discharging pulp. An auxiliary agent pipeline is connected to the premixing tank, and auxiliary agents are added into the premixing tank through the auxiliary agent pipeline. The outer wall of the premixing tank is equipped with a heat preservation coil. The stirring device includes a first drive component and a stirring screw. The first drive component is located outside the premixing tank and at the bottom of the premixing tank. The bottom end of the stirring screw is drivenly connected to the first drive component and is rotatably installed inside the premixing tank for mixing materials. A counterweight is provided at the top of the stirring screw to maintain the dynamic balance of the stirring screw during operation and to reduce the vibration generated during high-speed pulp fragmentation. The heat preservation system is connected to the heat preservation coil and is used to supply heat media such as water, steam, and heat transfer oil to the heat preservation coil. By precisely controlling the temperature of the heat preservation coil, a stable and suitable environment can be created for the fiber swelling reaction, thereby ensuring the quality and uniformity of fiber processing.

[0029] Compared to related technologies, the Lyocell fiber swelling machine provided in this application reduces the pulp conveying process, which not only minimizes the risk of impurities entering the system, but also upgrades the traditional indirect dissolution to a highly efficient direct dissolution method, thereby improving production efficiency and significantly enhancing the stability of the raw liquid system, meeting higher standard process requirements. Furthermore, since the agitator is located at the bottom of the premixing tank, the bottom agitation method eliminates the need for excessively long shafts and complex frame supports required for top drive, thus fundamentally solving the common shaft sway and vibration problems in the handling of high-viscosity materials, resulting in smoother and more reliable operation. This design not only significantly lowers the center of gravity of the equipment and enhances the stability of the overall structure, but also completely frees up the top space, facilitating the installation of other process pipelines, observation windows, or operations such as feeding and maintenance. In addition, bottom drive can more effectively promote the material to form an overall circulation from bottom to top, which is excellent for mixing, heat transfer, and preventing material deposition, and is particularly suitable for handling high-viscosity, high-solids-content fluids. Furthermore, by adding a counterweight to the top of the agitator screw, this application effectively reduces the vibration of the agitator screw during operation, thereby reducing equipment damage while improving the material fragmentation effect and slurry swelling rate, and enhancing the stability of the raw material production. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a lyocell fiber swelling machine disclosed in an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of another Lyocell fiber swelling machine disclosed in an embodiment of this application.

[0033] Among them, 100 is the premix tank, 101 is the feed inlet, 110 is the insulation coil, 120 is the nitrogen pipeline, and 130 is the additive pipeline.

[0034] 200 is a stirring device, 201 is a counterweight, 210 is a first driving component, 220 is a stirring screw, 230 is a scraper, 231 is a sleeve, and 240 is a second driving component. Detailed Implementation

[0035] The core of this application is to disclose a lyocell fiber swelling machine to ensure the mixing and swelling effect of porridge and improve the stability of raw material production.

[0036] Hereinafter, embodiments will be described with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model as described in the claims. Additionally, the complete contents of the structures represented in the embodiments below are not limited to those necessary for the solution of the utility model as described in the claims. It should be noted that, for ease of description, only the parts relevant to the utility model are shown in the drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0037] In the dry-process production of lyocell fibers, the traditional method involves first crushing the pulp sheet, then conveying it through multiple stages before indirect dissolution. This process is lengthy and involves numerous control points, making it difficult to meet the increasing demands for production volume and quality, and affecting the overall stability of the dosing system. To address this issue, this application discloses a lyocell fiber swelling machine to optimize the premixing process. This swelling machine integrates a high-concentration disintegration function, enabling direct dissolution of the pulp. Specifically, N-methylmorpholine N-oxide (NMMO) solvent and additives are pre-added to the premixing tank of the swelling machine, followed by the addition of the pulp sheet. Under the shearing action of the stirring screw inside the swelling machine, the pulp sheet is rapidly broken down and comes into direct contact with the solvent, completing the disintegration and initial swelling. By reducing the pulp conveying stages, this swelling machine not only minimizes the risk of impurities entering the system but also upgrades the traditional indirect dissolution to a highly efficient direct dissolution method, thereby improving production efficiency and significantly enhancing the stability of the dosing system, meeting higher-standard process requirements.

[0038] Combination Figure 1 The lyocell fiber swelling machine disclosed in this application includes a premixing tank 100, a stirring device 200, and a heat preservation system. The premixing tank 100 is provided with an inlet 101 for feeding slurry and an outlet for feeding slurry. An auxiliary agent pipeline is connected to the premixing tank 100, and the auxiliary agent is added into the premixing tank 100 through an auxiliary agent pipeline 130. The outer wall of the premixing tank 100 is provided with a heat preservation coil 110. The stirring device 200 includes a first driving member 210 and a stirring screw 220. The first driving member 210 is disposed outside the premixing tank 100 and located at the bottom of the premixing tank 100. The bottom of the stirring screw 220... The end is connected to the first driving component 210 and is rotatably set inside the premixing tank 100 for mixing materials. The top of the stirring screw 220 is provided with a counterweight 201, which is used to maintain the dynamic balance of the stirring screw 220 during operation and reduce the vibration generated during high-speed pulp crushing. The heat preservation system is connected to the heat preservation coil 110 and is used to supply heat media such as water, steam, and heat transfer oil to the heat preservation coil 110. By precisely controlling the temperature of the heat preservation coil 110, a stable and suitable environment can be created for the swelling reaction of the fiber, thereby ensuring the quality and uniformity of fiber processing.

[0039] Compared to existing technologies, the stirring device 200 of the lyocell fiber swelling machine disclosed in this application is placed at the bottom of the premixing tank 100, adopting a bottom stirring method. This eliminates the excessively long shaft system and complex frame support required for top drive, thereby fundamentally solving the common shaft swaying and vibration problems in the processing of high-viscosity materials, resulting in more stable and reliable operation. This design not only significantly lowers the center of gravity of the equipment and enhances the stability of the overall structure, but also completely frees up the top space, facilitating the installation of other process pipelines, observation windows, or operations such as feeding and maintenance. In addition, bottom drive can more effectively promote the material to form an overall circulation from bottom to top, which has excellent effects on mixing, heat transfer, and preventing material deposition, and is particularly suitable for processing high-viscosity, high-solids-content fluids. Furthermore, by adding a counterweight 201 to the top of the stirring screw 220, this application effectively reduces the vibration of the stirring screw 220 during operation, thereby reducing equipment damage while improving the material fragmentation effect and slurry swelling rate, and improving the stability of the raw liquid production.

[0040] In some embodiments, the top end of the stirring screw 220 is provided with a stepped structure, the stepped structure having a stepped surface facing away from the first driving member 210, and the counterweight 201 is sleeved on the top end of the stirring screw 220 and arranged in close contact with the stepped surface. Further, a first positioning pin hole and a second positioning pin hole can be respectively opened at corresponding positions on the stirring screw 220 and the counterweight 201, thereby achieving a reliable connection between the counterweight 201 and the stirring screw 220 by pin insertion.

[0041] In other embodiments, the top end of the stirring screw 220 can be configured with a threaded structure, with a corresponding threaded hole on the counterweight 201, thereby achieving a threaded connection between the stirring screw 220 and the counterweight 201. This facilitates easy assembly and disassembly, and allows for easy addition or reduction of the number of counterweights 201. The counterweight 201 can be circular, rectangular, or other shapes, and this application does not limit its shape.

[0042] Specifically, the first driving component 210 can be a motor, which is connected to the stirring screw 220 via a pulley or coupling. To prevent material leakage from the gap between the stirring screw 220 and the premixing tank 100, packing can be used for sealing. Packing is a wear-resistant rope-like material impregnated with lubricating oil, which can be tightly filled between the stirring screw 220 and the premixing tank 100 to provide a seal. Simultaneously, to cope with the frictional heat generated when the stirring screw 220 rotates at high speed, a water ring cooling system is installed between the upper and lower sections of packing. This water ring cooling system can circulate cooling water to continuously cool and lubricate the packing, thereby ensuring long-term, stable operation of the equipment.

[0043] In some embodiments, a discharge system is provided at the discharge port. The discharge system includes a discharge valve communicating with the discharge port, and a discharge pipe and a discharge pump sequentially connected to the discharge valve. Specifically, the discharge pump can be a single-screw pump. The single-screw pump has a stable flow rate without pulsation, low shear force on the material, and can gently transport high-viscosity and particulate materials. At the same time, it has strong self-priming capability and the ability to handle solid-liquid mixtures, and has a simple structure and is easy to maintain.

[0044] To prevent the crystallization of NMMO solvent during the discharge process, a first insulation jacket is installed on the wall of the discharge pipe. This first insulation jacket is connected to the aforementioned insulation system, which supplies heat to the first insulation jacket. This maintains the temperature of the slurry material strictly above the crystallization point of the NMMO solvent, preventing crystal precipitation and avoiding consequences such as slurry coagulation and pipe blockage. Specifically, the discharge pipe can be a jacketed pipe, comprising an inner pipe and an outer pipe fitted over the inner pipe. The inner pipe transports the slurry material, and the jacket between the outer and inner pipes serves as the first insulation jacket, connected to the insulation system. Hot coal can be introduced through this jacket, and the heat medium transfers heat to the slurry material through the wall of the inner pipe, thus maintaining its temperature.

[0045] To further optimize the design and prevent crystallization of materials as they flow through the discharge pump and discharge valve, a second insulation jacket is installed on the discharge pump, and a third insulation jacket is installed on the discharge valve. Both the second and third insulation jackets are connected to the insulation system, which can supply heat medium to the second and third insulation jackets to maintain the temperature of the discharge pump and discharge valve, thus preventing the crystallization of NMMO solvent at the discharge pump and discharge valve. Specifically, the second insulation jacket can be a hollow jacket layer welded or cast onto the pump body of the discharge pump. This jacket layer is isolated from the main flow channel of the discharge pump. After the heat medium is introduced into the second insulation jacket layer, it circulates within the second insulation jacket layer, transferring heat to the discharge pump and the slurry material in its main flow channel. The third insulation jacket layer can be a hollow jacket layer welded or cast onto the valve body of the discharge valve. This jacket layer is isolated from the main valve cavity of the valve body. The heat medium introduced into the third insulation jacket layer can heat and insulate the valve cavity and the material inside the valve cavity.

[0046] In some embodiments, the insulation system includes a plate heat exchanger and an insulation water pump. The plate heat exchanger has a heat source pipeline and an insulation pipeline. The heat source pipeline is connected to a heat source, and the insulation pipeline is connected to the insulation coil 110 to form an insulation circulation loop. The heat medium can circulate within the insulation circulation loop, thereby ensuring the reaction temperature within the premixing tank 100. The insulation water pump is connected in series in the insulation circulation loop to drive the heat medium to circulate within the loop. Specifically, the insulation water pump can adopt a dual-use, one-standby design. Two insulation water pumps operate simultaneously to meet the peak demand of the system, while a third pump is in standby mode as a backup pump. If any operating insulation water pump fails or requires maintenance, the standby pump will immediately start automatically or manually, thereby effectively avoiding the risk of the entire system shutting down due to a single point of failure and greatly ensuring the continuity and safety of production.

[0047] Furthermore, a control valve is installed on the heat source pipeline, and a temperature sensor is installed at the outlet of the insulation pipeline. The control valve can control its opening degree based on the temperature data from the temperature sensor, thereby regulating the insulation temperature of the insulation coil 110 in real time to ensure that it meets production requirements. The control valve can be a solenoid valve, an electric valve, a pneumatic valve, etc., and this application does not impose any restrictions on it.

[0048] Specifically, the plate heat exchanger and the insulation coil 110 can be connected through the first branch to form an insulation circulation loop. The plate heat exchanger and the first insulation jacket, the second insulation jacket and the third insulation jacket can be connected in series through the second branch to form an insulation circulation loop. Flow meters and control valves are respectively installed on the first branch and the second branch to control the flow of the heat medium.

[0049] In some embodiments disclosed in this application, combined with Figure 2 The lyocell fiber swelling machine includes a second drive unit 240 and multiple scrapers 230. The scrapers 230 are rotatably mounted inside a premixing tank 100 to scrape the bottom wall of the premixing tank 100. The scrapers 230 are arranged coaxially with the stirring screw 220. The second drive unit 240 is located outside the premixing tank 100 and at its bottom, and is drive-connected to the scrapers 230 to drive their rotation, facilitating discharge. For example, there can be six scrapers 230, evenly spaced around the central axis of the stirring screw 220. Each scraper 230 can be mounted on the outer wall of the same sleeve 231, which is fitted around the stirring screw 220 and engages with it via bearings. The sleeve 231 is also drive-connected to the second drive unit 240. The use of scrapers 230 further improves pulp fragmentation, increases swelling rate, and ensures more thorough discharge.

[0050] The stirring screw 220 and scraper 230 disclosed in this application embodiment are driven by the first driving member 210 and the second driving member 240 respectively, thereby realizing separate control, which improves the crushing effect and facilitates maintenance.

[0051] Further optimization of the design involves serrated ends to the spiral structure of the stirring screw 220 and the scraper 230, which improves the uniformity of pulp breaking down.

[0052] In some embodiments, the edge of the spiral structure of the stirring screw 220 is provided with a baffle, and the baffle is arranged inclined downward relative to the horizontal direction from the direction close to the central axis of the stirring screw 220 to the direction away from the central axis of the stirring screw 220, so as to reduce the floating of undissolved materials and thus improve product quality.

[0053] To enhance the stability and efficiency of the production process, the Lyocell fiber swelling machine also includes a nitrogen pipeline 120. The inlet of the nitrogen pipeline 120 is connected to a nitrogen source, and the outlet is connected to a premixing tank 100, allowing for continuous nitrogen injection into the premixing tank 100 during production. This inert gas protection effectively isolates the pulp from air, minimizing oxidation reactions during high-speed disintegration. This not only prevents abnormal fluctuations in pulp quality caused by oxidation, ensuring stable product performance, but also optimizes the disintegration process, shortens processing time, and ultimately reduces overall energy consumption and saves production costs.

[0054] In some embodiments, the premixing tank 100 includes a tank body and a tank lid. A stirring screw 220 is rotatably disposed within the tank body. A first driving member 210 is disposed outside the tank body and passes through the bottom of the tank body, drivingly connected to the stirring screw 220. The bottom of the tank body is provided with a discharge port for discharging material. The tank lid is disposed at the top of the tank body and integrates a manhole and observation hole for maintenance and monitoring. In addition, the tank lid is also provided with a feed inlet 101 for supplying slurry.

[0055] To achieve automated feeding, an automatic door driven by a cylinder can be installed at the feed inlet 101. The entire feeding process is uniformly controlled by the feeding scheduling system: when the system issues a "start feeding" command, the cylinder drives the automatic door to open; after feeding is completed, the system issues a "feeding completed" command, and the automatic door closes, thereby achieving unmanned and precise material conveying.

[0056] The terms "first" and "second," etc., used in the specification and claims of this application are used to distinguish different objects, not to describe a specific order, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed. Additionally, in the description of embodiments in this application, "a plurality of" means two or more.

[0057] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Specific technical means in some embodiments may be incorporated, in whole or in part, into another embodiment unless explicitly excluded by another embodiment. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lyocell fiber swelling machine, characterized in that, include: A premixing tank is provided with an inlet and an outlet, an additive pipeline is connected to the premixing tank, and an insulation coil is provided on the outer wall of the premixing tank. A mixing device, comprising a first driving member and a mixing screw, wherein the first driving member is disposed outside the premixing tank and located at the bottom of the premixing tank, the bottom end of the mixing screw is connected to the first driving member in a transmission manner, the mixing screw is rotatably disposed inside the premixing tank for mixing materials, and a counterweight is disposed at the top end of the mixing screw; A heat preservation system, which is connected to the heat preservation coil, is used to supply heat medium to the heat preservation coil.

2. The Lyocell fiber swelling machine as described in claim 1, characterized in that, The top end of the stirring screw is provided with a stepped structure, the stepped structure having a stepped surface facing away from the first driving member, and the counterweight is sleeved on the top end of the stirring screw and arranged in close contact with the stepped surface.

3. The lyocell fiber swelling machine as described in claim 1, characterized in that, A discharge system is provided at the discharge port, the discharge system including a discharge valve connected to the discharge port, and a discharge pipe and a discharge pump connected sequentially to the discharge valve.

4. The lyocell fiber swelling machine as described in claim 3, characterized in that, The discharge pipe is provided with a first insulation jacket, which is connected to the insulation system, and the insulation system is used to supply heat medium to the first insulation jacket.

5. The lyocell fiber swelling machine as described in claim 4, characterized in that, The discharge pump is provided with a second insulation jacket, and the discharge valve is provided with a third insulation jacket. Both the second and third insulation jackets are connected to the insulation system, which supplies heat medium to the second and third insulation jackets.

6. The lyocell fiber swelling machine as described in claim 1, characterized in that, The insulation system includes: A plate heat exchanger, wherein the plate heat exchanger has a heat source pipeline and an insulation pipeline, the heat source pipeline is connected to a heat source, and the insulation pipeline is connected to an insulation coil to form an insulation circulation loop; A heat-insulating water pump is connected in series in the heat-insulating circulation loop.

7. The lyocell fiber swelling machine as described in claim 6, characterized in that, A control valve is installed on the heat source pipeline, and a temperature sensor is installed at the outlet of the insulation pipeline. The control valve controls its opening degree based on the temperature data from the temperature sensor.

8. The lyocell fiber swelling machine as described in claim 1, characterized in that, Also includes: Multiple scrapers are rotatably disposed inside the premixing tank for scraping the bottom wall of the premixing tank, and the scrapers are arranged on the same axis as the stirring screw. The second driving component is disposed outside the premixing tank and located at the bottom of the premixing tank, and the second driving component is connected to the scraper drive.

9. The lyocell fiber swelling machine as described in claim 8, characterized in that, The end of the spiral structure of the stirring screw has a serrated structure; And / or, the end of the scraper has a serrated structure.

10. The lyocell fiber swelling machine as described in claim 1, characterized in that, The spiral structure of the stirring screw is provided with a baffle at its edge, and the baffle is arranged at a downward angle relative to the horizontal direction from the direction close to the central axis of the stirring screw to the direction away from the central axis of the stirring screw.

11. The lyocell fiber swelling machine as described in claim 1, characterized in that, It also includes a nitrogen pipeline, the inlet end of which is connected to a nitrogen source, and the outlet end of which is connected to the premixing tank.

12. The lyocell fiber swelling machine as described in claim 1, characterized in that, The premix tank includes: The barrel body, the stirring screw is rotatably disposed in the barrel body, the first driving member is disposed outside the barrel body and passes through the bottom of the barrel body and is connected to the stirring screw for transmission, and the discharge port is opened at the bottom of the barrel body; A bucket lid is provided at the top of the bucket body and includes a manhole, an observation hole, and a feed inlet.

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