Intermittent heating screw extrusion device based on electromagnetic induction

Abstract

The utility model discloses an intermittent heating screw extrusion device based on electromagnetic induction, which comprises an extrusion screw and a machine barrel covered outside the extrusion screw, two ends of the machine barrel are respectively provided with a feed port and a discharge port, the extrusion screw is connected with a rotary power mechanism, and the rotary power mechanism is connected with the machine barrel. The rotary power mechanism drives the extrusion screw to rotate around the axis of the extrusion screw so that the extrusion screw can extrude materials between the machine barrel and the extrusion screw from the feeding port to the discharging port, and the machine barrel is provided with a plurality of electromagnetic heating coils independently controlling the current intensity in the axial direction of the machine barrel. When the extrusion screw rotates, magnetic induction lines of the electromagnetic heating coils are cut to generate heat to form a plurality of heating areas corresponding to the electromagnetic heating coils, and the heating areas are provided with temperature detection modules. The utility model has the advantages that the temperature is accurately regulated and controlled by a plurality of independent heating areas, the year of spinning molten materials is prolonged, the energy consumption is saved, the energy overflow is reduced, and the overall service life of the device is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of screw extrusion device technology, and in particular to a screw extrusion device with intermittent heating based on electromagnetic induction. Background Technology

[0002] Microfibers, as a naturally occurring fine structure, have attracted much attention due to their unique mechanical properties and excellent tactile characteristics. Microfibers typically refer to fibrous materials with a single filament diameter of less than 5 μm or 0.55 dtex. This microscale endows the fibers with two significant characteristics: first, their bending stiffness decreases exponentially with decreasing fiber fineness; second, their huge specific surface area gives them unique surface effects. In terms of manufacturing technology, the industrial production of microfibers mainly relies on two categories of processes: direct forming methods (such as electrospinning technology) and composite spinning methods (typically represented by island-island spinning). Among these, the island-island method based on melt spinning, with its mature process system and large-scale production capacity, has become the most industrially valuable technology route in the current microfiber manufacturing field. This process, through the subsequent dissolution of soluble island components, can efficiently prepare microfibers with nanoscale fineness.

[0003] Because the spinning process of microfibers requires precise control of the viscosity of components in each extrusion zone, and viscosity adjustment mainly relies on temperature changes in the screw extruder, a suitable heating method and precise temperature control in each zone of the screw extruder are crucial for stable microfiber extrusion spinning. Conventional electric and steam heating methods in screw extruders suffer from low heat conversion efficiency, and significant heat is dissipated to the insulation layer and surrounding environment, resulting in high energy consumption and creating new obstacles to precise temperature control in each zone of the screw extruder. Furthermore, heat transfer to the insulation layer reduces its lifespan and increases maintenance costs. The heat transfer to the surrounding environment leads to higher on-site temperatures, deteriorating the production environment. Utility Model Content

[0004] To overcome the above-mentioned shortcomings of the prior art, this utility model provides a screw extrusion device based on electromagnetic induction and intermittent heating, which has multiple independently heated heating zones to precisely control the temperature, improve the annual yield of the spinning melt, save energy, reduce energy leakage, and improve the overall service life of the device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An intermittent heating screw extrusion device based on electromagnetic induction includes an extrusion screw and a barrel covering the extrusion screw. The two ends of the barrel are a feed port and a discharge port, respectively. The extrusion screw is connected to a rotary power mechanism, which drives the extrusion screw to rotate around its own axis so that the extrusion screw extrudes the material between the barrel and the extrusion screw from the feed port to the discharge port. The barrel is provided with several independently controlled electromagnetic heating coils along its axial direction. When the extrusion screw rotates, it cuts the magnetic field lines of the electromagnetic heating coils to generate heat, forming several heating zones corresponding to each electromagnetic heating coil. Each heating zone is equipped with a temperature detection module.

[0007] This application features multiple heating zones, each connected to a corresponding temperature detection module. Precise temperature control of different electromagnetic heating zones allows for precise regulation of the viscosity of the spinning melt. When the extrusion screw rotates, it cuts alternating frequency magnetic lines of force in an alternating electric field, generating eddy currents and heat. This enables the metal extrusion screw to heat itself, effectively preventing heat radiation and loss outside the barrel, saving significant energy consumption. Furthermore, it constrains the range of energy diffusion, reduces stress on the barrel shell caused by temperature differences, and improves the barrel's service life.

[0008] Preferably, the barrel is covered with an insulation layer. The insulation layer reduces energy loss, ensures reliable temperature control, and the extrusion screw generates its own heat by cutting magnetic field lines, thus limiting the energy diffusion range and improving the service life of the insulation layer.

[0009] Preferably, the insulation layer thickness is 1-5 cm, and the insulation layer material includes at least one of the following: insulation cotton, aerogel felt, phenolic resin foam, rock wool board, polystyrene foam, polyurethane foam, and glass wool felt. This achieves reliable insulation of the cylinder.

[0010] Preferably, the feed inlet is equipped with a storage bin corresponding to one end of the extrusion screw. The storage bin is equipped with a feeding component, which is a feeding hopper located at the top of the storage bin. The feeding hopper and the interior of the storage bin are connected by a pipe. The feeding hopper allows for online feeding of the storage bin, enabling continuous operation of the screw extrusion unit.

[0011] Preferably, the electromagnetic heating coil is wound around the outside of the barrel and energized by high-frequency alternating current. The electromagnetic heating coil is easy to set up, and the number of turns and winding area are easy to adjust and control. High-frequency alternating current refers to alternating current with a frequency higher than 20,000 Hz, which easily forms eddy current heating inside the extrusion screw.

[0012] Preferably, the rotary power mechanism includes a drive motor directly connected to the extrusion screw, with a storage bin positioned between the drive motor and the extrusion screw. This ensures reliable drive of the extrusion screw.

[0013] Preferably, the temperature detection module uses a temperature sensor located inside the insulation layer, which is connected to the control circuit module of the electromagnetic heating coil. This enables reliable temperature monitoring of the heating layer. Simultaneously, the connection between the temperature sensor and the control circuit module allows for rapid control of the electromagnetic heating coil's energization and current level based on the sensor's monitoring results, thus achieving precise temperature regulation within the heating zone.

[0014] Preferably, the heating zone has five sections arranged sequentially along the axial direction of the barrel, and the electromagnetic heating coils are intermittently energized to cause intermittent heating in the heating zone. The five heating zones are independently heated and temperature-controlled, allowing for precise regulation of the temperature inside the barrel and achieving stable extrusion spinning of ultrafine fibers.

[0015] This utility model has the following beneficial effects:

[0016] (1) It has multiple heating zones, each of which is connected to a corresponding temperature detection module. The viscosity of the spinning melt is controlled by precisely adjusting the temperature of different electromagnetic heating zones.

[0017] (2) The device has an electromagnetic coil directly wound around the outside of the barrel. When the extrusion screw rotates, it cuts the alternating frequency magnetic lines in the alternating electric field to generate eddy currents and heat. This can achieve the heating of the metal screw itself, which effectively avoids the radiation and loss of heat outside the barrel and saves a lot of energy.

[0018] (3) The device generates heat by cutting magnetic lines of force with an extrusion screw, which restricts the range of energy diffusion, reduces the stress caused by temperature difference on the shell of the barrel, and improves the service life of the barrel and insulation layer. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the screw extrusion device in this utility model.

[0020] Figure 2 This is a schematic diagram of the internal structure of the screw extrusion device in this utility model.

[0021] Figure 3 This is a schematic diagram of the external structure of the screw extrusion device in this utility model.

[0022] In the diagram: 1. Drive motor; 2. Feed hopper; 3. Storage bin; 4. Barrel; 5. Electromagnetic heating coil; 6. First heating zone 5-1; 7. Second heating zone 5-2; 8. Third heating zone 5-3; 9. Fourth heating zone 5-4; 10. Fifth heating zone 5-5; 11. Discharge port; 2. Insulation layer; 3. Extrusion screw; 4. Agitator; 5. Temperature detection module; 6. First temperature detection module 10-1; 7. Second temperature detection module 10-2; 8. Third temperature detection module 10-3; 9. Fourth temperature detection module 10-4; 10. Fifth temperature detection module 10-5; 11. Control circuit module; 12. Filter. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] Example 1

[0025] An intermittent heating screw extrusion device based on electromagnetic induction includes an extrusion screw 8 and a barrel 4 covering the extrusion screw 8. The two ends of the barrel 4 are a feed port and a discharge port 6, respectively. The extrusion screw 8 is connected to a rotary power mechanism, which drives the extrusion screw 8 to rotate around its own axis so that the extrusion screw 8 extrudes the material between the barrel 4 and the extrusion screw 8 from the feed port to the discharge port 6. The barrel 4 is provided with a number of independently controlled electromagnetic heating coils 5 along its axial direction. When the extrusion screw 8 rotates, it cuts the magnetic field lines of the electromagnetic heating coils 5 to generate heat, forming a number of heating zones corresponding to each electromagnetic heating coil 5. The heating zones are equipped with temperature detection modules 10.

[0026] When the screw extrusion device is in use, the material enters the barrel 4 from the feed port and is molten under the heating and extrusion action of the extrusion screw 8, and is extruded from the discharge port 6. When the material is inside the barrel 4, the electromagnetic heating coil 5 is energized to provide an alternating magnetic field. In this embodiment, the extrusion screw 8 is made of metal. When the extrusion screw 8 rotates, it cuts the magnetic field lines of the electromagnetic heating coil 5, forming eddy currents in the extrusion screw 8, thereby heating the extrusion screw 8. The heat from the extrusion screw 8 radiates outward to the entire heating zone. The temperature of the heating zone is continuously monitored by the temperature detection module 10 to achieve precise control of the temperature of the heating zone and realize stable extrusion spinning of ultrafine fibers.

[0027] In this application, the barrel 4 has a straight cylindrical structure with its axis arranged in a straight line. The barrel 4 can be made of thermally conductive and insulating non-metallic materials such as ceramic. This application has multiple heating zones, each of which is connected to a corresponding temperature detection module 10. The viscosity of the spinning melt is controlled by precisely regulating the temperature of different electromagnetic heating zones. When the extrusion screw 8 rotates, it cuts the alternating frequency magnetic lines of force in the alternating electric field, generating eddy currents and heat. This allows the metal extrusion screw 8 to heat up on its own, effectively preventing heat radiation and loss outside the barrel 4, saving a significant amount of energy. It also constrains the range of energy diffusion, reduces the stress on the barrel 4 shell caused by temperature differences, and improves the service life of the barrel 4.

[0028] Example 2

[0029] An intermittently heated screw extrusion device based on electromagnetic induction includes an extrusion screw 8 and a barrel 4 covering the extrusion screw 8. The barrel 4 has an inlet and an outlet 6 at its two ends. The extrusion screw 8 is connected to a rotary power mechanism, which includes a drive motor 1 directly connected to the extrusion screw 8. The rotary power mechanism drives the extrusion screw 8 to rotate around its own axis, causing the extrusion screw 8 to extrude the material between the barrel 4 and the extrusion screw 8 from the inlet to the outlet 6. The barrel 4 is provided with several independently controlled electromagnetic heating coils 5 along its axial direction. The electromagnetic heating coil 5 is cut during rotation to generate heat, forming several heating zones corresponding to each electromagnetic heating coil 5. Five heating zones are arranged sequentially along the axial direction of the barrel 4: first heating zone 5-1, second heating zone 5-2, third heating zone 5-3, fourth heating zone 5-4, and fifth heating zone 5-5. Temperature detection modules 10 corresponding to the five heating zones are: first temperature detection module 10-1, second temperature detection module 10-2, third temperature detection module 10-3, fourth temperature detection module 10-4, and fifth temperature detection module 10-5. The electromagnetic heating coil 5 is intermittently energized to intermittently heat the heating zones. The barrel 4 is covered with an insulation layer 7. The insulation layer 7 is 1-5 cm thick and is made of one or more of the following materials: insulation cotton, aerogel felt, phenolic resin foam, rock wool board, polystyrene foam, polyurethane foam, and glass wool felt. The insulation layer 7 reduces energy loss and ensures reliable temperature control. The extrusion screw 8 cuts the magnetic field lines to generate heat, which restricts the energy diffusion range and improves the service life of the insulation layer 7.

[0030] A storage bin 3 is located at the feed inlet, corresponding to one end of the extrusion screw 8. The storage bin 3 is positioned between the drive motor 1 and the extrusion screw 8. The storage bin 3 is equipped with a feeding component, which is a feeding hopper 2 located at the upper end of the storage bin 3. The feeding hopper 2 and the storage bin 3 are connected by a pipe. Online feeding of the storage bin 3 can be achieved through the feeding hopper 2, enabling continuous operation of the screw extrusion unit. An agitator 9 is installed inside the storage bin 3. The spinning components enter the storage bin 3 from the feeding hopper 2, are thoroughly mixed by the agitator 9, and then, driven by the rotary power mechanism, the fully mixed molten spinning material enters the barrel 4. An electromagnetic heating coil 5 is wound around the outside of the barrel 4 and powered by high-frequency alternating current. The electromagnetic heating coil 5 is easy to install, and the number of turns and winding area are easily adjusted and controlled. High-frequency alternating current refers to alternating current with a frequency higher than 20,000 Hz, which easily forms eddy current heating within the extrusion screw 8.

[0031] The heating zone is equipped with a temperature detection module 10. The temperature detection module 10 uses a temperature sensor located inside the insulation layer 7, which can be attached to the outside of the barrel 4 using a patch structure. The temperature sensor is connected to the control circuit module 11 of the electromagnetic heating coil 5. This enables reliable temperature monitoring of the heating layer. Simultaneously, the connection between the temperature sensor and the control circuit module 11 allows for rapid control of whether the electromagnetic heating coil 5 is energized and the magnitude of the energizing current, achieving precise temperature adjustment within the heating zone. A removable filter 12 is connected to the discharge port 6. The discharge port 6, after passing through the removable filter, connects to the fixed / unfixed island spinning box, ultimately forming fixed / unfixed island microfibers. Screw extrusion units (with co-feeding of marine and island components) can be used directly for the preparation of island-fixed microfibers. They can also be used for the preparation of island-fixed microfibers by connecting two screw extrusion units in parallel (one unit for marine component feeding and the other unit for island component feeding), or by connecting two screw extrusion units in parallel (one unit for co-feeding of marine and island components and the other unit for island component feeding) for the preparation of island-fixed / island-fixed composite microfibers.

[0032] Taking Example 2 as an example, the spinning component enters the storage bin 3 from the feed hopper 2. After being stirred by the agitator 9 and fully mixed, the fully mixed spinning molten material enters the barrel 4 under the drive of the drive motor 1. Under the action of the electromagnetic heating coil 5, the extrusion screw 8 cuts the magnetic lines of force to generate heat, and the spinning molten material melts inside. As the material is extruded, the temperature of different heating areas can be precisely controlled by controlling the current and energizing time of the electromagnetic heating coil 5, thereby controlling the viscosity of the spinning molten material. The metal screw of this invention generates its own heat, avoiding the radiation and loss of heat outside the barrel 4, saving a lot of energy. A 1-5 cm thick insulation layer 7 is set on the outside of the barrel 4 to prevent heat loss. The electromagnetic induction heating method used restricts the range of energy diffusion, reduces the stress caused by temperature difference on the shell of the barrel 4, and improves the service life of the barrel 4 and the insulation layer 7.

[0033] After the spinning raw material in the above steps is heated and melted, it enters the detachable filter 12 through the discharge port 6; the filtered mixed molten material enters the spinning box, and then passes through the special spinning spinneret for microfibers to finally form microfibers.

Claims

1. A screw extrusion device with intermittent heating based on electromagnetic induction, characterized in that, The device includes an extrusion screw and a barrel covering the extrusion screw. The two ends of the barrel are the feed port and the discharge port, respectively. The extrusion screw is connected to a rotary power mechanism, which drives the extrusion screw to rotate around its own axis so that the extrusion screw extrudes the material between the barrel and the extrusion screw from the feed port to the discharge port. The barrel is provided with several independently controlled electromagnetic heating coils along its axial direction. When the extrusion screw rotates, it cuts the magnetic field lines of the electromagnetic heating coils to generate heat, forming several heating zones corresponding to each electromagnetic heating coil. Each heating zone is equipped with a temperature detection module.

2. The screw extrusion device based on electromagnetic induction and intermittent heating according to claim 1, characterized in that, The barrel is covered with an insulation layer.

3. A screw extrusion device based on electromagnetic induction and intermittent heating according to claim 2, characterized in that, The insulation layer has a thickness of 1-5 cm, and the insulation layer material includes at least one of the following: insulation cotton, aerogel felt, phenolic resin foam, rock wool board, polystyrene foam, polyurethane foam, and glass wool felt.

4. The screw extrusion device based on electromagnetic induction and intermittent heating according to claim 1, characterized in that, The feed inlet is equipped with a storage bin corresponding to one end of the extrusion screw. The storage bin is equipped with a feeding component, which is a feeding hopper located at the upper end of the storage bin. The feeding hopper and the inside of the storage bin are connected by a pipe.

5. A screw extrusion device with intermittent heating based on electromagnetic induction according to claim 1, characterized in that, The electromagnetic heating coil is wound around the outside of the barrel and powered by high-frequency alternating current.

6. A screw extrusion device based on electromagnetic induction and intermittent heating according to claim 4, characterized in that, The rotary power mechanism includes a drive motor directly connected to the extrusion screw, and a storage bin is disposed between the drive motor and the extrusion screw.

7. A screw extrusion apparatus with intermittent heating based on electromagnetic induction according to claim 2 or 3, characterized in that, The temperature detection module uses a temperature sensor located inside the insulation layer, and the temperature sensor is connected to the control circuit module of the electromagnetic heating coil.

8. A screw extrusion device based on electromagnetic induction and intermittent heating according to claim 1, characterized in that, The heating zone has five sections arranged sequentially along the axial direction of the barrel, and the electromagnetic heating coils are intermittently energized to intermittently heat the heating zone.

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