An outer ring blowing device for producing high-quality polyamide 66 fibers

Abstract

The application discloses a kind of outer ring blowing devices for producing high-quality polyamide 66 fiber, it is related to the technical field of polymer production, including air intake control component, cooling air bellow is equipped with air volume distribution filter device, ring blowing cylinder is set in the inside of cooling air bellow, ring blowing cylinder has the central passage for passing through tow, and the cylinder wall of ring blowing cylinder is configured to allow cooling air to blow from the periphery of ring blowing cylinder to the central passage direction, to cool the tow passing through central passage, single body suction device is set in the upper of cooling air bellow, lifting drive device is connected with cooling air bellow.The application passes through and adopts the outer ring blowing structure that cooling air is sent from the periphery of air cylinder to center, and tow passes through the center of air cylinder, so that tow is cooled in the closed air cylinder, completely isolated from external environment interference, fundamentally avoids that tow shakes, and silk and broken head, significantly improves cooling uniformity and fiber quality.

Description

Technical Field

[0001] This invention relates to the field of polymer material production technology, and in particular to an outer ring blowing device for producing high-quality polyamide 66 fiber. Background Technology

[0002] An outer ring blower is a tow cooling device developed from a central ring blower, widely used in the tow cooling process during melt spinning of synthetic fibers. In the production of polyamide 66 fibers, after the melt is extruded through a spinneret to form a fine stream, it needs to be cooled by forced convection through a blower to crystallize and solidify, thereby obtaining nascent fibers with good physical and mechanical properties. Existing central ring blowers typically employ a structure where the tow is wrapped around the outside of the blower casing, with cooling air blowing outwards from the center of the casing to cool the tow surrounding the casing.

[0003] However, in existing central ring blowing devices, the filament bundles are exposed to the outside of the air duct for cooling. During the cooling process, the filament bundles are directly affected by external airflow and temperature fluctuations, which easily causes bundle swaying, leading to filament bundling and breakage between adjacent filaments. This problem is particularly prominent when producing fine denier and ultrafine denier polyamide 66 fibers. At the same time, existing central ring blowing devices have extremely stringent requirements for the overall airflow organization and environmental balance conditions in the spinning workshop. In actual production, the uniformity of filament bundle cooling often decreases due to environmental airflow fluctuations, directly resulting in increased fiber evenness and poor dyeing uniformity, making it difficult to meet the quality requirements of high-quality polyamide 66 fiber products.

[0004] To address the aforementioned technical issues, an outer ring blowing device for producing high-quality polyamide 66 fibers is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide an outer ring blowing device for producing high-quality polyamide 66 fibers, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an outer ring blowing device for producing high-quality polyamide 66 fibers, comprising:

[0007] An air intake control component, wherein the air intake control component is used to receive external cooling air and regulate the air intake volume;

[0008] A cooling air box is provided, and an air volume distribution filter device is provided inside the cooling air box. The air volume distribution filter device is used to rectify and homogenize the cooling air entering the cooling air box.

[0009] A ring blower is disposed inside the cooling air box. The ring blower has a central channel through which the filament bundle passes, and the cylinder wall of the ring blower is constructed to allow cooling air to blow out from the periphery of the ring blower toward the central channel to cool the filament bundle passing through the central channel.

[0010] A single-unit suction device is disposed above the cooling air box and is used to suction volatiles generated during the spinning process.

[0011] A lifting drive device is connected to the cooling air box and is used to drive the cooling air box to move back and forth in the vertical direction, so that the cooling air box can be sealed and fitted with the single suction device after it rises to the upper position.

[0012] Preferably, it also includes a ring blower frame and an oiling device. The oiling device is located below the cooling air box and fixed to the ring blower frame, and is used to apply oil to the cooled filament bundle. The individual suction device is fixedly installed on the top of the ring blower frame.

[0013] Preferably, the air intake control component includes:

[0014] A damper control valve, wherein the damper control valve is connected to the cooling air box by a flexible branch duct;

[0015] A damper control button box is electrically connected to the damper control valve and is used to control the opening degree of the damper control valve to adjust the air intake volume.

[0016] Preferably, the airflow distribution filtration device includes:

[0017] A non-woven fabric filter for rectifying cooling airflow;

[0018] A perforated plate filter is used to homogenize and distribute the rectified cooling air, and the non-woven fabric filter and the perforated plate filter are arranged sequentially in the cooling air box along the cooling air flow direction.

[0019] Preferably, the annular blower is a multi-layered wire mesh composite structure with a wire mesh count of 40 to 120 mesh, and the annular blower is detachably installed inside the cooling box.

[0020] Preferably, the effective cooling height of the annular blower is 240mm to 360mm.

[0021] Preferably, the single-unit suction device includes an inner suction cover and an outer suction cover, and the distance between the inner suction cover and the outer suction cover can be adjusted to adjust the suction force.

[0022] Preferably, the straight length of the flexible branch duct is 800-1000 mm, and the flexible branch duct deforms when the cooling air box is raised and lowered to maintain a stable supply of cooling air.

[0023] Preferably, the lifting drive device is a pneumatic lifting device, which is fixedly installed at the bottom of the ring blowing machine frame and connected to the cooling air box. After the pneumatic lifting device drives the cooling air box to the upper position, the upper end surface of the cooling air box is tightly fitted with the lower end surface of the single suction device to prevent cooling air from leaking from the fitting surface between the cooling air box and the single suction device.

[0024] Preferably, the oiling device is adjustable in both the vertical and horizontal directions, and the oiling device includes at least an oiling nozzle and a guide hook, and the distance between the oiling nozzle and the guide hook is independently adjustable.

[0025] The technical effects and advantages of this invention are as follows:

[0026] This invention employs an outer-ring airflow structure where cooling air is blown from the periphery of the air duct towards the center, and the fiber bundle passes through the center of the air duct. This ensures that the fiber bundle remains enclosed within the air duct throughout the cooling process, completely isolating it from the direct influence of external airflow and temperature fluctuations. This fundamentally prevents fiber swaying, strand bundling, and breakage. Simultaneously, the air duct and composite filtration device work together to ensure that the cooling air undergoes thorough rectification, filtration, and homogenization before entering the air duct, effectively eliminating eddies and turbulence and achieving a uniform distribution of airflow velocity within the air duct. Through this synergistic effect, the fiber bundle is efficiently and uniformly cooled and solidified within the air duct, significantly reducing fiber evenness and fundamentally improving dyeing uniformity, thereby meeting the production requirements of high-quality polyamide 66 fine denier and ultrafine denier fibers.

[0027] This invention optimizes the effective cooling height of the annular blower to 240-360mm, ensuring sufficient cooling travel for the molten fine stream as it passes through the center of the blower after exiting the spinneret. This meets the crystallization cooling requirements of fine denier, ultrafine denier, and conventional polyamide 66 fibers, avoiding structural inhomogeneity caused by insufficient cooling. Simultaneously, a monomer suction device with inner and outer suction hoods is installed close to the top of the cooling blower. The distance between the inner and outer hoods can be finely adjusted according to the fiber type and suction volume requirements. This allows for the efficient extraction of oligomers, unreacted monomers, and crystals with minimal suction force, effectively preventing oligomers and crystalline monomers from adhering to the inside of the blower. This ensures a clean and stable environment with uniform air permeability within the blower, further improving the spinnability and dyeing properties of polyamide 66 fibers. Attached Figure Description

[0028] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0029] Figure 1 This is a schematic diagram of the front structure of the present invention.

[0030] In the attached diagram: 1. Damper control valve; 2. Flexible branch duct; 3. Circular blowing frame; 4. Cooling air box; 5. Circular blowing duct; 6. Air volume distribution filter device; 601. Perforated plate filter; 602. Non-woven fabric filter; 7. Pneumatic lifting device; 8. Individual suction device; 9. Oiling device; 901. Oil tank; 902. Oil pipe; 903. Oil pump; 904. Oil inlet hose; 905. Oiling bracket; 906. Oil nozzle; 907. Guide hook; 10. Damper control button box. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] This invention provides, for example Figure 1The device shown is an outer ring blower for producing high-quality polyamide 66 fibers. It is mainly used for cooling polyamide 66 fibers and is suitable for polyamide 66 fiber products with a fineness range of 20d-140den. It is widely used for fine denier and ultrafine denier polyamide 66 fibers with a single filament fineness of 0.1-1.0dpf, and also meets the requirements for various differentiated varieties of conventional polyamide 66 fibers with a single filament fineness range of 1.0-3.34dpf. Specifically, it includes an air inlet control component, a cooling air box 4, an annular blower 5, a single-unit suction device 8, and a lifting drive device. It also includes an annular blower frame 3 and an oiling device 9. The air inlet control component is used to receive external cooling air and adjust the air inlet volume. The cooling air box 4 is equipped with an airflow distribution filter 6, which is used to rectify and homogenize the cooling air entering the cooling air box 4 to ensure that the cooling air has a uniform speed distribution before entering the annular blower 5. The annular blower 5 is set inside the cooling air box 4. The annular blower 5 has a central channel for the filament bundle to pass through, and the cylinder wall structure of the annular blower 5 is designed to allow cooling air to be blown out from the periphery of the annular blower 5 towards the central channel to cool the filament bundle passing through the central channel. After the polyamide 66 melt filament bundle is extruded from the spinneret (not shown in the figure) set above the cooling air box 4, it passes vertically downward through the central channel of the annular blower 5. During this process, the cooling air is blown out evenly from the periphery of the annular blower 5 towards the center to efficiently and uniformly cool the filament bundle. The monomer suction device 8 is located above the cooling air box 4 and is fixedly installed on the top of the ring blower frame 3. The monomer suction device 8 is used to suction the oligomers, unreacted monomers and crystals volatilized from the polyamide 66 melt during the spinning process. The lifting drive device is connected to the cooling air box 4 and is used to drive the cooling air box 4 to move back and forth in the vertical direction, and to seal the cooling air box 4 with the monomer suction device 8 after it has moved to the upper position. The oiling device 9 is located below the cooling air box 4 and is fixed to the ring blower frame 3. It is used to apply oil to the cooled yarn to give the yarn good antistatic properties and smoothness to meet the requirements of the subsequent winding process.

[0033] Through the aforementioned overall structural design, the polyamide 66 melt tow, after being extruded from the spinneret, passes through the central channel of the annular blower 5. Cooling air is evenly blown from the periphery of the annular blower 5 towards the center, cooling and solidifying the tow. Since the tow remains inside the annular blower 5 throughout the cooling process, surrounded by the annular blower 5 and the cooling air box 4, it is completely isolated from external airflow and temperature fluctuations, preventing tow swaying, strand bundling, and breakage. This significantly improves the uniformity of tow cooling and the quality of the fiber product. Simultaneously, the monomer suction device 8 can promptly remove volatiles generated during spinning, maintaining a clean internal environment within the annular blower 5 and preventing oligomers and crystalline monomers from adhering to the mesh surface of the annular blower 5, thus affecting air permeability uniformity and ensuring the stability and consistency of cooling effects during long-term continuous production.

[0034] In a preferred embodiment, the air intake control assembly includes an air damper control valve 1 and an air damper control button box 10. The air damper control valve 1 is connected to the cooling air box 4 by a flexible branch air duct 2. The air damper control button box 10 is fixedly installed on the side of the ring blower frame 3 or on the operation panel. The air damper control button box 10 and the air damper control valve 1 are electrically connected via a signal cable. The operator can send control commands to the air damper control valve 1 through the control buttons or knobs on the air damper control button box 10 to control the opening degree of the air damper control valve 1, thereby precisely adjusting the cooling air volume entering the cooling air box 4. During the production process, the operator can adjust the air intake volume at any time through the air damper control button box 10 according to the process requirements of different polyamide 66 fiber varieties. Each outer ring blower is independently equipped with a damper control valve 1 on its branch air duct. When producing the same type of polyamide 66 fiber products, the damper control valve 1 of each outer ring blower is set to operate at the same opening degree, thereby ensuring the consistency of air intake at each station, effectively eliminating the difference between spindle positions, and ensuring the uniformity of product quality in the same batch.

[0035] In this embodiment, the straight length of the flexible branch duct 2 is 800mm to 1000mm. One end of the flexible branch duct 2 is connected to the damper control valve 1, and the other end is connected to the air inlet of the cooling air box 4. Due to the flexible and bendable nature of the flexible branch duct 2, when the lifting drive device drives the cooling air box 4 to move up and down in the vertical direction, the flexible branch duct 2 can undergo corresponding deformation (such as bending, stretching, or compression), always maintaining the sealed connection between the damper control valve 1 and the cooling air box 4, ensuring that the cooling air does not leak during the delivery process. At the same time, setting the straight length of the flexible branch duct 2 to 800mm to 1000mm allows the cooling air to pass through a sufficiently long duct for flow stabilization before entering the cooling air box 4, eliminating turbulence and eddies from the damper control valve 1, and allowing the cooling air to enter the cooling air box 4 in a more stable state, which is beneficial for the subsequent airflow distribution filter device 6 to homogenize the cooling air.

[0036] In a preferred embodiment, the airflow distribution filtration device 6 includes a non-woven fabric filter 602 and a perforated plate filter 601, which are arranged sequentially within the cooling air box 4 along the cooling airflow direction. The non-woven fabric filter 602 rectifies the cooling airflow, eliminating deviations and eddies generated during transport, thus aligning the airflow direction. The perforated plate filter 601 homogenizes the rectified cooling airflow, ensuring a uniform airflow and velocity distribution in the circumferential direction of the annular blower 5 before it passes through the wall of the annular blower 5. The combined use of the non-woven fabric filter 602 and the perforated plate filter 601 effectively ensures uniform airflow entering each annular blower 5 and uniform velocity distribution within each annular blower 5. This composite filtration and homogenization structure effectively avoids eddies and turbulence caused by excessively high or low local flow velocities in the cooling air, achieving the goals of pressure stabilization and equalization, and providing a reliable airflow guarantee for uniform cooling of the filament bundle.

[0037] In a preferred embodiment, the annular blower 5 is a multi-layered composite wire mesh structure. The mesh count of the multi-layered composite wire mesh structure is 40 to 120 mesh, that is, it is composed of two or more layers of wire mesh stacked together. Adjacent wire mesh layers can be tightly fitted or maintain a small gap. The stacking of multiple layers of wire mesh can effectively improve the filtration accuracy and increase the uniformity of resistance to the cooling air, so that the cooling air forms a uniform radial airflow when passing through the cylinder wall. The annular blower 5 is detachably installed inside the cooling air box 4. Specifically, the annular blower 5 can be fixed to the inner wall of the cooling air box 4 by means of threaded connection, snap-fit ​​connection, or bolt connection. When maintenance, cleaning, or replacement is required, the operator can remove the annular blower 5 from the cooling air box 4 separately, clean it, and then reinstall it. This detachable structural design greatly facilitates subsequent production operations and maintenance, and reduces equipment maintenance costs. The effective cooling height of the annular blower duct 5 is 240mm to 360mm. Effective cooling height refers to the range within which cooling air can pass through the wall of the annular blower duct 5 to cool the filament bundle; that is, the height of the permeable section of the annular blower duct 5. After the polyamide 66 melt is ejected from the spinneret to form a fine stream, it has a high temperature and specific heat capacity, requiring sufficient height and time to release heat and complete crystallization and solidification. When the effective cooling height of the annular blower duct 5 is less than 240mm, the filament bundle does not stay in the duct for long enough, resulting in insufficient cooling, substandard fiber crystallinity, and affecting the product's mechanical properties. When the effective cooling height is greater than 360mm, although cooling is more thorough, the increased duct height leads to larger equipment size, higher manufacturing costs, and a longer travel distance of the filament bundle within the duct increases the probability of breakage. The effective cooling height range of 240mm to 360mm ensures that the fine stream of polyamide 66 melt ejected from the spinneret has sufficient cooling stroke as it passes through the central channel of the annular blower 5 to meet the crystallization cooling requirements of fine denier, ultrafine denier, and conventional polyamide 66 fibers.

[0038] In a preferred embodiment, the monomer suction device 8 includes an inner suction hood and an outer suction hood. The distance between the inner and outer suction hoods is adjustable to regulate the suction force. That is, the positions of the inner and outer suction hoods can be moved relative to each other. By adjusting the distance between the inner and outer suction hoods, the cross-sectional area of ​​the suction chamber and the flow field distribution of the suction airflow can be changed, thereby achieving precise adjustment of the suction force. Because polyamide 66 melt is highly volatile during spinning, oligomers, unreacted monomers, and crystals carried in the melt are easily volatilized and precipitated at high temperatures. The monomer suction device 8 is connected to an external vacuum system or exhaust system through a suction pipe. Under the action of suction force, the volatiles are promptly extracted from the fiber bundle passage area. In actual production, operators can adjust the distance between the inner and outer suction hoods according to the different fiber types and specific requirements of the spinning process to smoothly extract the oligomers, unreacted monomers, and crystals carried in the polyamide 66 melt with minimal suction force. A well-designed suction force effectively removes volatiles, preventing oligomers and crystalline monomers from adhering to the inside of the annular blower 5 and affecting air permeability and spinnability. However, excessive suction force also prevents the removal of too much heat or interference with the stable operation of the yarn bundle. This structure effectively improves the spinnability of polyamide 66 products, reduces fiber evenness, and enhances the dyeing uniformity of polyamide 66 fibers.

[0039] In a preferred embodiment, the lifting drive device is a pneumatic lifting device 7, which is fixedly installed at the bottom of the ring blower frame 3 and connected to the cooling air box 4. After the pneumatic lifting device 7 drives the cooling air box 4 to move upward, the upper end face of the cooling air box 4 is tightly fitted with the lower end face of the single suction device 8 to prevent cooling air from leaking from the fitting surface between the cooling air box 4 and the single suction device 8, thus ensuring the airtightness of the outer ring blower in the working state. Furthermore, the cooling air box 4 is driven downward to disengage from the single suction device 8, allowing the operator to easily inspect, clean, or replace components such as the ring blower duct 5 and the airflow distribution filter device 6 inside the cooling air box 4.

[0040] In a preferred embodiment, the position of the oiling device 9 in the vertical and horizontal directions can be adjusted. The oiling device 9 can be freely adjusted in the up and down and back and forth directions through the elongated hole on the oiling bracket 905, the slide rail or the screw adjustment mechanism. The operator can adjust the position of the oiling device 9 relative to the outlet of the ring blower 5 according to the needs of the spinning process, so that the yarn bundle contacts the oiling nozzle 906 for oiling under the best tension state. The oiling device 9 includes at least an oiling nozzle 906 and a guide hook 907, and the distance between the oiling nozzle 906 and the guide hook 907 can be adjusted independently, that is, the oiling nozzle 906 and the guide hook 907 each have their own independent adjustment mechanism; at the same time, the oiling device 9 also includes an oil tank 901, an oil pipe 902, an oil pump 903, an oil inlet hose 904, and an oiling bracket 905; the oil in the oil tank 901 is transmitted to the oiling nozzle 906 through the oil pipe 902, the oil pump 903, and the oil inlet hose 904. When the yarn bundle descends through the oiling nozzle 906, the oil in the oiling nozzle 906 performs the oiling operation on the yarn bundle; the operator can adjust the installation position of the oiling nozzle 906 and the guide hook 907 according to the different requirements of the spinning tension for different polyamide 66 product varieties, thereby changing the relative distance between them, and thus adjusting the contact angle and contact pressure of the yarn bundle during the oiling process, so as to achieve precise control of the spinning tension. Through the above-mentioned adjustment functions, the oiling device 9 can meet the oiling requirements of various polyamide 66 products, ensure the antistatic and smooth properties of fine denier and ultrafine denier porous fibers, and also adapt to the process requirements of different fineness and different spinning speeds.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An outer ring blowing device for producing high-quality polyamide 66 fibers, characterized in that, include: An air intake control component, wherein the air intake control component is used to receive external cooling air and regulate the air intake volume; Cooling air box (4), the cooling air box (4) is provided with an air volume distribution filter device (6), the air volume distribution filter device (6) is used to rectify and homogenize the cooling air entering the cooling air box (4); A ring blower (5) is disposed inside the cooling air box (4). The ring blower (5) has a central channel through which the filament bundle passes, and the cylinder wall of the ring blower (5) is constructed to allow cooling air to blow out from the periphery of the ring blower (5) toward the central channel to cool the filament bundle passing through the central channel. A single-unit suction device (8) is disposed above the cooling box (4) and is used to suction volatiles generated during the spinning process. The lifting drive device is connected to the cooling air box (4) and is used to drive the cooling air box (4) to move back and forth in the vertical direction, and to make the cooling air box (4) seal and fit with the single suction device (8) after it moves up to the position.

2. The outer ring blowing device for producing high-quality polyamide 66 fiber according to claim 1, characterized in that, It also includes a ring blower frame (3) and an oiling device (9). The oiling device (9) is located below the cooling air box (4) and fixed to the ring blower frame (3) for applying oil to the cooled filament bundle. The single-unit suction device (8) is fixedly installed on the top of the ring blower frame (3).

3. The outer ring blowing device for producing high-quality polyamide 66 fiber according to claim 1, characterized in that, The air intake control component includes: The damper control valve (1) is connected to the cooling air box (4) by a flexible branch air pipe (2). The damper control button box (10) is electrically connected to the damper control valve (1) and is used to control the opening of the damper control valve to adjust the air intake volume.

4. The outer ring blowing device for producing high-quality polyamide 66 fiber according to claim 1, characterized in that, The airflow distribution filter device (6) includes: A nonwoven filter (602) is used to rectify cooling air; A perforated plate filter (601) is used to homogenize the distribution of the rectified cooling air, and the non-woven fabric filter (602) and the perforated plate filter (601) are arranged sequentially in the cooling air box (4) along the cooling air flow direction.

5. The outer ring blowing device for producing high-quality polyamide 66 fiber according to claim 1, characterized in that, The annular blower (5) is a multi-layer wire mesh composite structure with a wire mesh count of 40 to 120 mesh. The annular blower (5) is detachably installed inside the cooling box (4).

6. The outer ring blowing device for producing high-quality polyamide 66 fiber according to claim 1, characterized in that, The effective cooling height of the ring blower (5) is 240mm to 360mm.

7. The outer ring blowing device for producing high-quality polyamide 66 fiber according to claim 1, characterized in that, The single-unit suction device (8) includes an inner suction cover and an outer suction cover. The distance between the inner suction cover and the outer suction cover can be adjusted to adjust the suction force.

8. The outer ring blowing device for producing high-quality polyamide 66 fiber according to claim 3, characterized in that, The straight length of the flexible branch duct (2) is 800-1000mm. The flexible branch duct (2) deforms when the cooling air box (4) is raised and lowered to maintain the stable delivery of cooling air.

9. The outer ring blowing device for producing high-quality polyamide 66 fiber according to claim 2, characterized in that, The lifting drive device is a pneumatic lifting device (7). The pneumatic lifting device (7) is fixedly installed at the bottom of the ring blowing machine frame (3) and connected to the cooling air box (4). After the pneumatic lifting device (7) drives the cooling air box to move up to the position, the upper end face of the cooling air box (4) is tightly fitted with the lower end face of the single suction device (8) to prevent the cooling air from leaking from the fitting surface of the cooling air box (4) and the single suction device (8).

10. The outer ring blowing device for producing high-quality polyamide 66 fiber according to claim 2, characterized in that, The oiling device (9) is adjustable in both vertical and horizontal directions. The oiling device (9) includes at least an oiling nozzle (906) and a guide hook (907), and the distance between the oiling nozzle and the guide hook is adjustable independently.

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