Vertical-blowing uniform-temperature hot-air approaching surrounding type spandex spinning device and spinning method

Abstract

This invention discloses a vertically blowing, uniformly heated hot air approximation surrounding spandex spinning device and method, including a component mounting base, a liquid insulation box, a spinneret assembly, and a rectifier plate. The rectifier plate is composed of several honeycomb cores arranged in a staggered, multi-layered configuration, horizontally positioned below the component mounting base. The rectifier plate has spacer holes for housing the spinneret extension. The rectifier plate includes at least two honeycomb core layers, each with regularly arranged polygonal air channels, with adjacent honeycomb core layers having staggered polygonal air channels. A layered hot air space is formed between the rectifier plate and the component mounting base, and this layered hot air space is connected to an external hot air source through air channel grooves provided on the component mounting base. During operation, hot air enters the layered hot air space through the air channel grooves, diffuses and homogenizes, and then passes downward through the rectifier plate to form a vertically downward uniformly heated hot air flow, approximating and surrounding the fine stream of spinning liquid ejected from the spinneret orifice. This invention improves the quality of spandex spinning and the safety of the spinning production process.

Description

Technical Field

[0001] This invention relates to the field of spandex spinning technology, specifically to a vertically blown uniformly heated hot air approximation surrounding spandex spinning device and spinning method. Background Technology

[0002] Spandex (polyurethane elastic fiber) is a synthetic fiber with excellent elastic recovery properties, widely used in clothing, medical, and industrial fields. Currently, spandex production mainly employs a dry spinning process, with core production equipment including spinning tunnels, spinneret assemblies, and hot air systems. However, existing dry spinning technology for spandex suffers from the following prominent problems: First, the hot air structure is unreasonable, resulting in poor temperature uniformity. The traditional old-style circular channel vertical blowing structure uses a single-ring or double-ring array for the spinneret assembly, while the upper center of the channel is occupied by an inverted cone-shaped guide. This circular channel structure limits the number of fibers produced and results in low production efficiency. In addition, the hot air is arranged on the periphery of the single-ring or double-ring array, leading to uneven hot air distribution between the inner and outer areas. Existing improved spandex spinning channels generally adopt square channels (rectangular cross-section) and side-blowing structures. The rectangular array arrangement of the spinneret assembly increases the number of yarns produced. However, since the hot air is blown horizontally from the side of the channel, it intersects perpendicularly with the vertically falling spinning solution stream. This hot air structure leads to a large temperature difference between the windward and leeward sides, with hot air temperature uniformity of only ±15-25℃, resulting in inconsistent spinning conditions at each spinneret. Furthermore, the lateral wind force disturbs the spinning solution stream, easily causing yarn drift and breakage, with fiber fineness CV values ​​as high as 3-5%. In addition, due to the long distance the hot air needs to penetrate, heat attenuation is severe, resulting in incomplete solvent evaporation in the lower temperature areas within the channel.

[0003] Secondly, the large temperature difference between the top and bottom of the spinneret poses a safety hazard. Although the spinneret assembly is equipped with a liquid cooling circulation protection structure, the temperature of the hot air in the tunnel is as high as 240-300℃, resulting in a high temperature rise at the part of the lower end of the spinneret that is in direct contact with the hot air in the tunnel. If the heat cannot be dissipated in time, the temperature rise in this part will easily lead to an abnormal decrease in the viscosity of the spinning solution. This will result in poor filament quality after the spinning solution is output from the spinneret, and in severe cases, it may even cause snowflake-like phenomena or intermittent phenomena in the spinning solution, making it impossible to form filaments.

[0004] Third, the suspension of the yarn feeding box poses a significant safety hazard. During spandex spinning, a yarn feeding box is needed to initiate yarn production after replacing the spinneret assembly. As the yarn feeding box descends within the tunnel, it is prone to suspension for the following reasons: First, protruding components such as thermometer sleeves on the tunnel wall can easily cause the box to snag or get stuck; second, the lightweight cardboard material of the box creates significant friction with the tunnel wall, making it prone to adhering to the wall under the air cushion effect; and third, if the paper yarn feeding box is suspended in the high-temperature tunnel for an extended period, it can easily ignite, potentially igniting the spandex yarn bundles and DMAC solvent throughout the tunnel, posing a substantial safety hazard. Currently, the method for dealing with the suspension of the wire feeding box is to manually open the bottom of the channel and use a long rod to push the wire feeding box upwards to make it detach from the hook point or adhesion point and fall down. However, this manual operation method is time-consuming and has the drawback of DMAC solvent leakage, which causes the DMAC content in the spinning room to exceed the standard, and will have a negative impact on the occupational health and safety of production personnel.

[0005] In summary, existing spandex dry spinning technology suffers from problems such as uneven hot air distribution in the duct, excessively high spinneret temperature, and significant safety hazards caused by the suspension of the feeding box. There is an urgent need to develop a new type of spandex spinning device and method to achieve uniform hot air temperature across the entire duct, controllable low temperature of the spinneret, and automatic unblocking of the feeding box, thereby improving fiber quality and production safety. Summary of the Invention

[0006] To address the aforementioned problems, this invention proposes a vertically blown, uniformly heated air approximation surround-type spandex spinning device and method, aiming to improve the quality of spandex spinning and the safety of the spinning production process. The specific technical solution is as follows: A vertically blown, uniformly heated hot air approximation surround type spandex spinning device includes: The component mounting base has several rows of parallel air duct grooves on its lower end face and several rows of component mounting slots on its upper end face. Each row of component mounting slots is located between two adjacent rows of air duct grooves in the vertical projection direction. The liquid insulation tank is fixed at the top by a support positioning plate connected to the component mounting base, and at the bottom is installed in the component mounting slot to contain the circulating cooling medium. A spinneret assembly, several sets of the spinneret assemblies are installed on the liquid insulation tank, each set of the spinneret assembly includes a spinneret plate mounting sleeve, a spinneret plate installed and connected to the inner hole of the lower end of the spinneret plate mounting sleeve, and several spinneret holes opened on the spinneret plate. A water-cooled positioning sleeve is provided on the liquid insulation tank, and the spinneret mounting sleeve is fixedly inserted into the water-cooled positioning sleeve; The rectifier plate, employing a three-dimensional honeycomb structure with multiple layers of honeycomb cores arranged in a staggered manner, is horizontally positioned below the component mounting base. Spacer holes are provided on the rectifier plate directly opposite the spinneret. The rectifier plate comprises at least two honeycomb core layers and a filter layer. The filter layer is positioned above the top honeycomb core layers. Each honeycomb core layer has regularly arranged polygonal air ducts, with the polygonal air ducts of adjacent honeycomb core layers staggered. Through the combination of the filter and the honeycomb core layers, a slight air resistance is generated between the layers, causing the hot air to be homogenized first within the upper layered hot air space, and then rectified by the rectifier plate before passing downwards. A hot air diaphragm is provided on the back of the component mounting groove and extends downward into the diaphragm hole and mates with the diaphragm hole. The bottom of the component mounting groove is provided with a number of bottom holes at intervals, and the upper end of the hot air diaphragm is connected to the bottom holes. The lower end of the spinneret extends downward into the internal cavity of the hot air diaphragm; a layered hot air space is formed between the rectifier plate and the component mounting base, and the layered hot air space and the rectifier plate form an integral air outlet; the layered hot air space is connected to an external hot air source through the air duct groove. Preferably, the lower end face of the component mounting base is provided with a downwardly protruding outer frame, and the rectifier plate is mounted and positioned in the outer frame and is provided with a gap between it and the back of the component mounting groove of the component mounting base for forming the layered hot air space.

[0007] Preferably, an intermediate combined filter layer formed by stacking a perforated plate and a filter screen is horizontally arranged in the air duct channel. The intermediate combined filter layer divides the air duct channel into an upper air duct chamber and a lower air duct chamber. The external hot air source is connected to the upper air duct chamber, and the lower air duct chamber is connected to the layered hot air space.

[0008] During operation, the hot air first enters the upper chamber of the air duct for initial homogenization, then passes through the intermediate combined filter layer and enters the lower chamber of the air duct for secondary diffusion and homogenization. After that, a uniform hot air is formed in the layered hot air space, and then passes down through the rectifier plate to form a vertically downward uniform hot air flow, which approaches and surrounds the fine stream of spinning solution ejected from the spinneret.

[0009] As another preferred embodiment of the rectifier plate in this invention, the rectifier plate can also be a combination of a filter screen and a perforated plate.

[0010] The aforementioned spandex spinning device is installed at the upper inlet of the spandex spinning channel. Under the action of hot air at a high temperature (approximately 250-300℃), the DMAC solvent in the spinning solution stream undergoes flash evaporation to obtain spandex yarn.

[0011] As a further improvement, the vertical blowing uniform hot air approximation surrounding spandex spinning device of the present invention further includes a spinneret temperature self-balancing component for preventing overheating of the lower part of the spinneret, which includes: A sealed hollow cylinder is coaxially disposed in the lower inner hole of the water-cooled positioning sleeve and extends downward into the hot air diaphragm sleeve; a hollow rectangular flange is provided on the upper part of the sealed hollow cylinder, the hollow rectangular flange is located between the bottom of the liquid insulation tank and the component mounting groove and is fixedly fitted to the bottom end face of the liquid insulation tank, and the inner cavity of the hollow rectangular flange is connected to the inner cavity of the sealed hollow cylinder; the inner cavity of the sealed hollow cylinder is in a high vacuum state and is filled with deionized water accounting for 35%-45% of the inner cavity volume as the evaporation-condensation working fluid; A heat exchange jacket is disposed inside the sealed hollow cylinder and extends axially to the upper and lower end faces of the sealed hollow cylinder. The spinneret includes an upper cylindrical base and a lower spinneret cylinder. The upper part of the cylindrical base is connected to the lower inner hole of the spinneret mounting sleeve, and the lower part of the cylindrical base is connected to the lower inner hole of the water-cooled positioning sleeve. The spinneret cylinder is inserted into the heat exchange sleeve, and the spinneret hole is opened on the bottom end surface of the spinneret cylinder and axially penetrates the spinneret.

[0012] Preferably, the spinneret holes on the spinneret cylinder can be single holes or multiple holes arranged in a dispersed manner.

[0013] Preferably, an aerogel heat insulation coating is provided on the outer circular surface of the sealed hollow cylinder and the back end face of the hollow rectangular flange to reduce the transfer of heat below.

[0014] The working principle of the spinneret temperature self-balancing component is as follows: When the temperature of the lower part of the spinneret cylinder is too high, heat will be transferred to the lower part of the sealed hollow cylinder, causing the temperature of the lower part of the sealed hollow cylinder to rise as well. When the temperature exceeds the set value, the ionized water in the sealed hollow cylinder evaporates and rises to the top under high vacuum. Since the top hollow rectangular flange of the sealed hollow cylinder is connected to the bottom of the liquid insulation box, its temperature is lower, thus triggering water vapor condensation. The condensate falls back to the bottom of the sealed hollow cylinder by its own weight, causing the temperature of the bottom of the sealed hollow cylinder to drop, forming a high-efficiency gravity heat pipe circulation, thereby suppressing the temperature rise of the lower part of the spinneret cylinder.

[0015] Preferably, the coefficient of thermal expansion of the heat exchange jacket is less than that of the spinneret cylinder, thereby enabling a micro-gap sliding fit between the heat exchange jacket and the spinneret cylinder under normal operating conditions, facilitating the disassembly and replacement of the spinneret assembly; at the same time, it enables an interference fit between the heat exchange jacket and the spinneret cylinder under high-temperature operating conditions, thereby enhancing the reliability of contact heat transfer under high-temperature operating conditions.

[0016] As a further improvement of the present invention, an enhanced condensation assembly is provided between the liquid insulation box and the hollow rectangular flange of the sealed hollow cylinder, which includes N closed condensation pipes that are erected upwards on the hollow rectangular flange, and the N closed condensation pipes are distributed around the upper end face of the hollow rectangular flange. The lower end of the closed condenser tube is connected to the inner cavity of the hollow rectangular flange, and the upper end of the closed condenser tube extends upward and is inserted into the circulating cooling medium of the liquid insulation tank. Preferably, a sealing ring is provided between the bottom end face of the liquid insulation tank and the upper end face of the hollow rectangular flange to prevent leakage at the bottom of the liquid insulation tank.

[0017] The inner wall of the closed condenser tube forms an additional enhanced condensation heat exchange surface, which is used to accelerate the condensation and liquefaction of the working fluid vapor, and guides the condensate back to the bottom of the sealed hollow cylinder by gravity.

[0018] Since the closed condenser tubes are placed directly in the circulating cooling medium of the liquid insulation tank, the efficiency of steam condensation is further improved.

[0019] In this invention, the rectifier plate is a biomimetic breathing rectifier plate, which is formed by at least two layers of honeycomb cores stacked in a staggered manner. A rectifier plate hot air temperature and flow rate adaptive adjustment controller is provided between the two layers of honeycomb cores. The rectifier plate hot air temperature and flow rate adaptive adjustment controller includes an inverted V-shaped bimetallic sheet suspended in each polygonal air duct of the lower honeycomb core. The upper tip of the inverted V-shaped bimetallic sheet is fixed to the solid edge of the lower end of the polygonal air duct of the upper honeycomb core by ultrasonic welding.

[0020] Preferably, the surface of the V-shaped bimetallic strip is provided with a DMAC solvent-resistant protective layer, which has good corrosion resistance and a long service life.

[0021] The working principle of the biomimetic breathing-type rectifier plate's adaptive hot air temperature and flow rate control: The V-shaped bimetallic strip bends and deforms with temperature changes, altering the opening angle of the V-shape. This opening and closing deformation, with the opening angle of the V-shaped bimetallic strip increasing and decreasing with temperature fluctuations, forms a biomimetic breathing mechanism. When the overall temperature of the hot air passing through the rectifier plate deviates from the set value, the adaptive change in the opening angle of the V-shaped bimetallic strip adjusts the flow area of ​​the polygonal air ducts on the honeycomb core. When the hot air temperature is too high, the opening angle of the V-shaped bimetallic strip increases, resulting in a decrease in the flow area; when the hot air temperature is too low, the opening angle of the V-shaped bimetallic strip decreases. The reduced opening angle leads to an increased flow area, enabling adaptive adjustment of the hot air flow rate into the tunnel. This adjustment of the hot air flow rate helps restore the temperature within the tunnel to the target value. In areas of higher hot air temperature on the rectifier plate, the V-angle opening angle increases, increasing the obstruction area and automatically reducing the hot air flow rate. Conversely, in areas of lower hot air temperature on the rectifier plate, the V-angle opening angle decreases, reducing the obstruction area and automatically increasing the hot air flow rate. This negative feedback adaptive adjustment mechanism promotes uniform hot air flow within the tunnel, improving the uniformity of hot air temperature throughout the tunnel and further enhancing the quality and consistency of spandex spinning.

[0022] As an application of the present invention in a spandex spinning tunnel, the component mounting base is installed at the upper entrance of the square tunnel, and the spinneret assembly is arranged in a rectangular array on the component mounting base.

[0023] As another application of the present invention in the spandex spinning tunnel, the component mounting base can also be installed at the upper entrance of the circular tunnel. In this case, the component mounting base is a circular component mounting base, and both the air duct groove and the component mounting groove are annular grooves. The spinneret assembly is arranged in a multi-ring array (number of rings ≥ 3 rings) on the component mounting base.

[0024] As a further improvement of the present invention, the spandex spinning device is provided with a yarn feeding box anti-hanging and escaping mechanism. The yarn feeding box anti-hanging and escaping mechanism includes an airflow disturbance device at the top of the tunnel on the component mounting base. The airflow disturbance device at the top of the tunnel includes an intermediate opening and closing control valve located in the middle of the air duct of the component mounting base and frequency conversion pulse opening and closing valves respectively located on the external air inlet pipes at both ends of the air duct. The yarn feeding box anti-hanging and escaping mechanism also includes a number of infrared ranging probes located on the tunnel door at the lower end of the spandex spinning tunnel. The infrared ranging probes are distributed on the tunnel door and their detection direction is upward.

[0025] Preferably, the intermediate opening and closing control valve is a 90-degree deflection valve, which includes a miniature angle motor located on the upper end face of the component mounting base and a plate-type rotating door vertically positioned in the middle of the air duct trough. The motor shaft of the miniature angle motor is inserted into the air duct trough and then connected to the plate-type rotating door. In the initial state, the plate-type rotating door is parallel to the direction of the air duct trough. When the plate-type rotating door rotates through a 90-degree angle, it can cut off the middle air duct of the air duct trough.

[0026] The upper and lower chambers of the air duct are respectively equipped with plate-type rotating doors, which are fixed to the motor shaft of the miniature rotary motor by connecting sleeves.

[0027] The working principle of the top airflow disturbance device in the above-mentioned anti-hanging and escape mechanism of the wire feeding box is as follows: external hot air enters from both ends of the air duct. When the wire feeding box is in normal position, the middle opening and closing control valve located in the middle of the air duct is in the open state. When the infrared ranging probe connected to the spandex spinning control system detects that the wire feeding box is hanging in the channel, the control system cuts off the air duct in the middle position through the middle opening and closing control valve, and at the same time alternately switches the frequency conversion pulse opening and closing valve, thereby breaking the balance of airflow in the channel, so that there is a local area of ​​strong airflow and another local area of ​​weak airflow in the channel, forming an alternating change of airflow strength. The strong fluctuation of airflow will make the hanging wire feeding box smoothly detach from the inner wall of the channel and fall smoothly.

[0028] Preferably, a tunnel bottom airflow enhancement and disturbance device is provided on the tunnel door. The tunnel bottom airflow enhancement and disturbance device includes a number of nitrogen nozzles that are arranged upward on the tunnel door and circumferentially close to the inner wall of the tunnel. The nitrogen nozzles are connected to nitrogen delivery pipes and are controlled by nitrogen injection control valves provided on nitrogen delivery pipes. It works in conjunction with the tunnel top airflow disturbance device to enhance the unevenness of the airflow in the lower part of the tunnel and improve the reliability of the wire feeding box in preventing it from getting stuck.

[0029] The working principle of the above-mentioned airflow enhancement and disturbance device at the bottom of the tunnel is as follows: When the wire feeding box is suspended, the control system determines the attitude of the wire feeding box based on the ranging results of multiple infrared ranging probes, and selectively opens or alternately opens and closes several nitrogen nozzles through the nitrogen injection control valve; when the nitrogen airflow is injected from the local area at the bottom of the tunnel upward, it will form a local enhanced airflow in the tunnel below the wire feeding box, thereby breaking the air cushion effect at the bottom of the wire feeding box. It forms a synergistic effect with the airflow disturbance of the top air duct, realizing bidirectional airflow disturbance and accelerating the wire feeding box's escape.

[0030] Preferably, a plurality of probe purgers are provided on the inner side of the door frame of the passageway door. Each probe purger includes an extension tube inserted from the outside into the inner side of the door frame and an oblique nozzle located at the front end of the extension tube and obliquely aligned with the infrared ranging probe. The extension tube is connected to the annular high-pressure nitrogen buffer tank, and a pulse valve is provided on the extension tube to realize pulse-type cleaning of the infrared ranging probe before detection, thereby improving detection accuracy.

[0031] The control logic for the coordinated operation of the aforementioned airflow enhancement and disturbance device at the bottom of the tunnel and the airflow disturbance device at the top of the tunnel can be to activate only the airflow disturbance device at the top of the tunnel, or only the airflow enhancement and disturbance device at the bottom of the tunnel, or to activate both the airflow enhancement and disturbance device at the bottom of the tunnel and the airflow disturbance device at the top of the tunnel simultaneously, forming a coordinated airflow disturbance in both directions.

[0032] Preferably, the nitrogen delivery pipe connected to the nitrogen nozzle includes a pulse-jet nitrogen delivery pipe and a directional blasting nitrogen delivery pipe. The pulse-jet nitrogen delivery pipe and the directional blasting nitrogen delivery pipe are connected in parallel and connected to the nitrogen nozzle through a tee pipe. The nitrogen injection control valve on the pulse-jet nitrogen delivery pipe is a pulse valve, and the nitrogen injection control valve on the directional blasting nitrogen delivery pipe is a quick-release valve. The nitrogen delivery pipe is connected to an annular high-pressure nitrogen buffer storage tank.

[0033] The annular high-pressure nitrogen buffer tank is installed on the outside of the door frame of the passageway door via a supporting angle iron.

[0034] Preferably, the pulse valve on the pulse-jet nitrogen delivery pipe is connected to the annular high-pressure nitrogen buffer tank via a pressure regulating valve to regulate the pulse pressure.

[0035] Preferably, each of the directional blasting nitrogen delivery pipes is connected to the same annular high-pressure nitrogen buffer storage tank.

[0036] During operation, the pulse valve or the quick release valve can be selectively opened according to the test results to output the required pulse nitrogen gas flow or directional explosive nitrogen gas flow.

[0037] A spinning method for a vertically blown, uniformly heated, hot air-approaching enclosed spandex spinning device includes the following steps: S1. Airflow homogenization control steps: The external hot air source is activated, and the hot air enters the layered hot air space from both ends of the air duct. After being horizontally diffused and homogenized in the layered hot air space, it passes downward through the rectifier plate to form a vertically downward uniform hot air flow that closely surrounds the fine flow of spinning solution. The rectifier plate adopts a three-dimensional honeycomb structure with several honeycomb core layers arranged in a staggered manner. The polygonal air ducts of adjacent honeycomb core layers are staggered to form a micro-resistance for the hot air to pass downward through the rectifier plate, ensuring that the hot air is horizontally uniformly diffused in the layered hot air space before flowing downward out of the rectifier plate. S2. Spinneret Temperature Self-Balancing Control Step: The spinning solution is ejected downwards from the spinneret orifices to form fine spinning solution streams. The uniformly heated airflow output downwards by the rectifier plate approaches and surrounds each fine spinning solution stream. When the temperature of the lower spinneret cylinder is too high due to the hot air, the heat is transferred from the spinneret cylinder to the lower end of the sealed hollow cylinder. The deionized water in the sealed hollow cylinder evaporates in a high vacuum environment and rises to the top. It condenses under the cooling effect of the liquid insulation box. The condensed deionized water falls back to the bottom of the sealed hollow cylinder by its own weight, forming a gravity heat pipe circulation, which suppresses the temperature rise of the lower spinneret cylinder and controls the working temperature of the spinneret within the set temperature range. S3, Solvent flash curing step: Under the action of hot air and high temperature, the DMAC solvent in the spinning solution is flashed to obtain spandex yarn.

[0038] Preferably, the hot air input temperature is controlled within the range of 245-300℃, the hot air temperature in the upper part of the tunnel is not lower than 240-250℃, and the hot air temperature in the middle part of the tunnel is not lower than 210-220℃.

[0039] As a further improvement, the spinning method of the vertical blowing uniform temperature hot air approximation surrounding spandex spinning device of the present invention also includes a method for preventing the feeding box from snagging and getting stuck, the method comprising the following three stages: Phase 1: Directional blasting escape phase; When the infrared ranging probe detects that the wire-feeding box is suspended, the control system identifies the probe number and distance value corresponding to the position where the wire-feeding box is attached to the inner wall of the tunnel, and then controls the quick release valve on the directional blasting nitrogen delivery pipe directly below the attachment position to open instantly. The high-pressure nitrogen in the annular high-pressure nitrogen buffer tank is released instantly and sprayed upward from the bottom of the tunnel to the attachment position of the wire-feeding box, generating an explosive impact force to detach the wire-feeding box from the inner wall of the tunnel; When the infrared ranging probe detects that the decrease in the distance value at each point exceeds the preset threshold, it is determined that the escape was successful and the process enters the second stage. The second stage: pulsed airflow coordinated attitude correction and horizontal descent stage; the attitude of the wire feeding box is tracked in real time by an infrared ranging probe, and the maximum difference ΔD of the distance values ​​of each measuring point and the tilt angle θ are calculated; when the tilt of the wire feeding box is detected, the variable frequency pulse opening and closing valves at both ends of the airflow disturbance device at the top of the tunnel are controlled to alternately or synchronously switch on and off; at the same time, the nitrogen nozzles of the airflow enhancement disturbance device at the bottom of the tunnel are controlled to selectively open or alternately open and close; according to the tilt direction of the wire feeding box, the airflow enhancement part is controlled to generate a corrective torque until the maximum difference ΔD of the distance values ​​of each measuring point is less than the set threshold, and the attitude is determined to be basically horizontal; The third stage: restoring balanced airflow; after the wire feeding box is corrected to a horizontal position, the opening and closing control valve in the middle of the top air duct is restored to the open state, the variable frequency pulse opening and closing valves at both ends are opened simultaneously, and the nitrogen nozzle at the bottom is closed, so that the wire feeding box falls horizontally to the bottom of the tunnel under the action of balanced airflow; the infrared ranging probe determines that the wire feeding box has landed based on the range of the ranging data, the escape is completed, and normal production is restored.

[0040] When the wire feeding box is suspended, its attachment point to the tunnel wall is usually higher than other parts of the box. Traditionally, this is done manually with a long pole, which involves pushing the attachment point upwards to allow it to fall automatically after detachment. This patent employs a three-stage operation. The first stage uses local airflow strength differences to simulate manual pushing with a pole. The second stage (after the wire feeding box detaches from the tunnel wall) uses reverse airflow control to correct the box's posture (an infrared detection probe tracks its posture in real time). The third stage restores normal, balanced airflow, allowing it to fall horizontally.

[0041] Preferably, a pre-stage short-term pulse test escape stage is set before the first stage (directional blasting escape stage): when the infrared ranging probe detects that the wire-feeding box is suspended, the control system identifies the probe number and distance value corresponding to the wire-feeding box's attachment position; controls the pulse valve on the pulse-jet nitrogen delivery pipe directly below the attachment position to open intermittently, performing 1-2 pulse test escape attempts; simultaneously controls the frequency conversion pulse on / off valves at both ends of the airflow disturbance device at the top of the tunnel to alternately switch pulses; when the infrared ranging probe detects that the distance value drops beyond the set threshold, the control system determines that the pulse test escape attempt is successful, skips the first stage, and directly enters the second stage; when the distance value (within the given error variation range) remains unchanged after 1-2 pulse tests, it is determined that the pulse test escape attempt has failed, and the first stage is resumed. Directional blasting is only used when short-term pulse probing fails to extricate the trapped object. This helps reduce the number of directional blasts and thus the workload of attitude adjustment.

[0042] If the wire feeding box fails to fall after several consecutive directional blasts, the control system will issue an alarm to prompt manual intervention.

[0043] This invention, through the systematic reconstruction of the hot air system, spinneret cooling system, and wire feeding box auxiliary system, not only solves the long-standing problems of quality fluctuations and safety hazards in dry spinning of spandex from the source, but also provides a brand-new technical path to achieve high-quality, high-efficiency, and intelligent spandex production.

[0044] The beneficial effects of the present invention are further analyzed as follows: First, the present invention provides a vertically blown, uniformly heated, hot air-approaching enveloping spandex spinning device and method. By setting up an upper chamber, a lower chamber, a layered hot air space, and a multi-layered staggered rectifier plate structure, it achieves secondary homogenization of the hot air. This changes the traditional transverse blowing of the hot air to a vertical, direct flow, forming a uniformly heated air bath that vertically descends and approaches the fine stream of spinning solution. This reduces the transverse disturbance of the filaments by the hot air, avoiding filament drift and breakage. The multi-layered staggered rectifier plate structure creates micro-resistance for the hot air to pass through, forcing the hot air to first diffuse laterally within the layered hot air space and then flow vertically out, achieving pre-homogenization of the hot air in the upper layered hot air space. This structure completely eliminates the temperature difference between the windward and leeward sides caused by traditional side-blowing; it reduces the temperature uniformity error across the entire channel cross-section from the existing ±15-25℃ to within ±5-8℃, which helps avoid solvent residue problems caused by localized low temperatures.

[0045] Secondly, the present invention provides a vertically blown, uniformly heated hot air approximation surrounding spandex spinning device and method, equipped with a spinneret temperature self-balancing component. This component utilizes the principle of vacuum heat pipes to automatically adjust the heat exchange power according to changes in heat load. The heat transferred from the high-temperature tunnel environment to the lower part of the spinneret is rapidly removed through the evaporation-condensation cycle of deionized water inside a sealed hollow cylinder, ensuring that the temperature at the lower end of the spinneret remains stable within the set temperature range. This innovative structural design effectively avoids production anomalies such as abnormally low viscosity of the spinning solution, large yarn diameter errors, snowflake-like phenomena, and yarn breakage caused by overheating at the lower part of the spinneret. Furthermore, the enhanced condensation component (with a sealed condenser tube directly inserted into the cooling circulation medium of the liquid insulation tank) within the spinneret temperature self-balancing component significantly improves the system's thermal response speed, ensuring long-term continuous and stable operation of the spinning process and demonstrating a significant effect on maintaining the extreme stability of the spinning process.

[0046] Third, the present invention provides a vertically blowing, uniformly heated hot air approximation surrounding spandex spinning device and spinning method. The innovatively designed biomimetic breathing-type rectifier plate employs a honeycomb core staggered stacking assembly structure. A rectifier plate hot air temperature and flow rate adaptive adjustment controller is installed between adjacent upper and lower honeycomb cores. The hot air flow rate is adaptively adjusted based on temperature changes through an inverted V-shaped bimetallic strip located within the polygonal air duct of the honeycomb core. This hot air temperature and flow rate adjustment mechanism is entirely based on a biomimetic breathing mechanism, requiring no external sensors or control systems. It is a completely passive adaptive adjustment with a short response time and fast adjustment speed, further reducing the temperature difference of the hot air within the duct to within ±2-5℃. Because the upper and lower honeycomb cores are staggered and stacked, the V-shaped bimetallic strip can enter the lower air duct in a non-contact manner during stacking. The stacking assembly of the honeycomb cores is relatively simple, convenient to manufacture, and low in cost.

[0047] Fourth, the present invention provides a vertically blown uniform-temperature hot air approach enveloping spandex spinning device and spinning method, featuring an innovative anti-hanging and escaping mechanism for the feeding box. This mechanism utilizes a collaborative working mode of "infrared ranging sensing + top airflow disturbance + bottom airflow enhancement" to construct a fully automatic anti-hanging and escaping mechanism for the feeding box. By alternately opening and closing the intermediate on / off control valve and the variable frequency pulse on / off valve of the airflow disturbance device at the top of the tunnel, the equilibrium of the upper airflow within the tunnel is disrupted, generating alternating strong and weak undulating airflows to help the suspended feeding box detach from the tunnel wall. Furthermore, by using a nitrogen nozzle to spray upwards from the bottom of the tunnel through the airflow enhancement disturbance device at the bottom of the tunnel, the equilibrium of the lower airflow within the tunnel is disrupted, creating a coordinated vertical disturbance with the top airflow, further improving the success rate of the feeding box escaping.

[0048] Fifth, the present invention provides a vertical blowing uniform temperature hot air approach enveloping spandex spinning device and spinning method. The anti-hanging and detachment strategy of the feeding box adopts a phased progressive detachment strategy. Based on the real-time monitoring data of the infrared ranging probe, it sequentially performs pre-pulse trial detachment, directional blast detachment, attitude correction under airflow control, and normal airflow recovery after attitude correction. This greatly improves the working reliability of the anti-hanging and detachment operation of the feeding box. The entire detachment process does not require manual intervention, there is zero leakage of DMAC solvent, the risk of fire of the feeding box is eliminated, and the detachment efficiency is greatly improved. It has a high degree of intelligence and overcomes the various drawbacks caused by the traditional manual use of long poles to push the feeding box. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the structure of a vertical blowing uniform temperature hot air approximation surrounding spandex spinning device according to the present invention. Figure 2 This is a schematic diagram of the structure of a vertical blowing uniform temperature hot air approach enveloping spandex spinning device of the present invention installed on a square passageway. Figure 3 yes Figure 1A 3D view of the component mounting base; Figure 4 It is Figure 3 The component mounting bracket in the middle is flipped to the back 3D view; Figure 5 This is a schematic diagram (sectional view) of the internal structure of a spandex spinning device. Figure 6 yes Figure 5 A magnified view of the lower half; Figure 7 yes Figure 5 A schematic diagram of the self-balancing spinneret temperature assembly in the image; Figure 8 yes Figure 7 A schematic diagram of the spinneret in the image (two-dimensional top and bottom views); Figure 9 yes Figure 5 A bottom view of the air outlet area of ​​the rectifier plate in a spandex spinning device. Figure 10 This is a schematic diagram of the stacked structure of a biomimetic breathing rectifier (partial top view, where the solid lines represent the upper honeycomb core and the dashed lines represent the lower honeycomb core). Figure 11 yes Figure 10 A schematic diagram of the V-shaped bimetallic strip in the diagram; Figure 12 This is a schematic diagram of a structure for installing an airflow disturbance device at the top of the tunnel. Figure 13 A device to enhance and disturb airflow at the bottom of the tunnel is installed. Figure 14 Yes Figure 6 A schematic diagram of a further improved self-balancing spinneret temperature assembly. Figure 15 yes Figure 14 A detailed schematic diagram of the improved spinneret temperature self-balancing component; Figure 16 yes Figure 15 A schematic diagram of the spinneret in the improved spinneret temperature self-balancing assembly (two-dimensional top and bottom views). Figure 17 Is Figure 15 A schematic diagram of a further improved structure for a closed hollow cylinder based on the existing design. In the diagram: 1. Component mounting base; 2. Air duct channel; 3. Component mounting slot; 4. Liquid insulation box; 5. Spinneret assembly; 6. Spinneret mounting sleeve; 7. Spinneret; 8. Spinneret orifice; 9. Water-cooled positioning sleeve; 10. Rectifier plate; 11. Spacer hole; 12. Honeycomb core layer; 13. Upper honeycomb core; 14. Lower honeycomb core; 15. Polygonal air duct; 16. Hot air spacer; 17. Bottom hole; 18. Layered hot air space; 19. Filter screen; 20. Spinneret. 21. Self-balancing wire plate temperature assembly; 22. Sealed hollow cylinder; 23. Deionized water; 24. Heat exchange jacket; 25. Cylindrical base; 26. Spinneret cylinder; 27. Hollow rectangular flange; 28. Sealed condenser tube; 29. ​​Circulating cooling medium; 30. Phase change synergistic enhancement structure; 31. Vertical fins; 32. Phase change heat absorption material; 33. Rectifier plate hot air temperature and flow adaptive adjustment controller; 34. V-shaped bimetallic strip; 35. Solid edge; 36. Yong (likely a type of metal conduit). 36. Aerogel insulation coating; 37. Airflow disturbance device at the top of the passageway; 38. Intermediate opening and closing control valve; 39. External air inlet duct; 40. Variable frequency pulse opening and closing valve; 41. Infrared ranging probe; 42. Miniature rotary motor; 43. Plate-type rotating door; 44. Airflow enhancement disturbance device at the bottom of the passageway; 45. Nitrogen nozzle; 46. Nitrogen delivery pipe; 47. Nitrogen injection control valve; 48. Passageway door (revolving double door); 49. Probe 50. Head purger, extension tube, 51. angled nozzle, 52. pulse jet nitrogen delivery pipe, 53. directional explosive nitrogen delivery pipe, 54. tee pipe, 55. pulse valve, 56. quick release valve, 57. annular high-pressure nitrogen buffer tank, 58. hot air inlet, 59. outer frame, 60. intermediate combined filter layer, 61. upper chamber of air duct, 62. lower chamber of air duct, 63. connecting sleeve, 64. support positioning plate, 65. door frame, 66. pressure regulating valve.

[0050] In the diagram: A is the air outlet area, B is the spinneret outlet position, and C is the mounting bolt. Detailed Implementation

[0051] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0052] Example 1: like Figures 1 to 13 The illustration shows an embodiment of a vertically blown, uniformly heated, hot air approximation type spandex spinning apparatus according to the present invention, comprising: The component mounting base 1 has several rows of parallel air duct grooves 2 on its lower end face and several rows of component mounting grooves 3 on its upper end face. Each row of component mounting grooves 3 is located between two adjacent rows of air duct grooves 2 in the vertical projection direction. The liquid insulation tank 4 is fixed at the top by a support positioning plate 64 connected to the component mounting base 1, and at the bottom is installed in the component mounting groove 3 to contain the circulating cooling medium 28. Spinneret assembly 5, several sets of the spinneret assembly 5 are installed on the liquid insulation tank 4, each set of the spinneret assembly 5 includes a spinneret plate mounting sleeve 6, a spinneret plate 7 installed and connected to the inner hole of the lower end of the spinneret plate mounting sleeve 6, and several spinneret holes 8 opened on the spinneret plate 7. A water-cooled positioning sleeve 9 is installed on the liquid insulation tank 4, and the spinneret mounting sleeve 6 is fixedly inserted into the water-cooled positioning sleeve 9. The rectifier plate 10 adopts a three-dimensional honeycomb structure with multiple layers of honeycomb core layers 12 arranged in a staggered manner. It is horizontally set below the component mounting base 1, and a spacer hole is opened on the rectifier plate 10 directly opposite the spinneret 7. The rectifier plate 10 includes at least two honeycomb core layers 12 and a filter 19. The filter 19 is set on the top layer above the honeycomb core layers 12. Each honeycomb core layer 12 has regularly arranged polygonal air ducts 15. The polygonal air ducts 15 of adjacent honeycomb core layers 12 are staggered. Through the combination of the filter 19 and the honeycomb core layers 12, the hot air generates a slight wind resistance between the layers, which causes the hot air to be homogenized in the upper layered hot air space first, and then rectified by the rectifier plate 10 before passing downward. A hot air diaphragm 16 is provided on the back side of the component mounting groove 3 and extends downward into the diaphragm hole 11 and cooperates with the diaphragm hole 11. The bottom of the component mounting groove 3 is provided with a number of bottom holes 17 at intervals, and the upper end of the hot air diaphragm 16 is connected to the bottom holes 17. The lower end of the spinneret 7 extends downward into the internal cavity of the hot air diaphragm 16; a layered hot air space 18 is formed between the rectifier plate 10 and the component mounting base 1, and the layered hot air space 18 and the rectifier plate 10 form an integral air outlet; the layered hot air space 18 is connected to an external hot air source through the air duct 2. Preferably, the lower end face of the component mounting base 1 is provided with a downwardly protruding outer frame 59, and the rectifier plate 10 is installed and positioned in the outer frame 59 and is provided with a distance between it and the back of the component mounting groove 3 of the component mounting base 1 for forming the layered hot air space 18.

[0053] Preferably, an intermediate combined filter layer 60, which is formed by stacking a perforated plate and a filter screen 19, is horizontally arranged inside the air duct 2. The intermediate combined filter layer 60 divides the air duct 2 into an upper air duct chamber 61 and a lower air duct chamber 62. The external hot air source is connected to the upper air duct chamber 61, and the lower air duct chamber 62 is connected to the layered hot air space 18.

[0054] Preferably, a filter screen 19 is provided on the lower end surface of the rectifier plate 10.

[0055] During operation, the hot air first enters the upper chamber 61 of the air duct for initial homogenization, then passes through the intermediate combined filter layer 60 and enters the lower chamber 62 of the air duct for secondary diffusion and homogenization. After that, a uniform hot air is formed in the layered hot air space 18, and then passes down through the rectifier plate 10 to form a vertically downward uniform hot air flow, which approaches and surrounds the fine stream of spinning solution ejected from the spinneret 8.

[0056] The aforementioned spandex spinning device is installed at the upper inlet of the spandex spinning channel 35. Under the action of hot air at a high temperature (approximately 250-300°C), the DMAC solvent in the spinning solution stream undergoes flash evaporation to obtain spandex yarn.

[0057] As another preferred embodiment of the rectifier plate, the rectifier plate can also be a combination of a filter screen and a perforated plate.

[0058] As a further improvement, the vertical blowing uniform hot air approximation surrounding spandex spinning device of this embodiment also includes a spinneret temperature self-balancing component 20 for preventing overheating of the lower part of the spinneret 7, which includes: A sealed hollow cylinder 21 is coaxially disposed in the lower inner hole of the water-cooled positioning sleeve 9 and extends downward into the hot air diaphragm 16; the inner cavity of the sealed hollow cylinder 21 is in a high vacuum state and is filled with deionized water 22 accounting for 35%-45% of the inner cavity volume as an evaporation-condensation working fluid. The heat exchange jacket 23 is disposed inside the sealed hollow cylinder 21 and extends axially to the upper and lower end faces of the sealed hollow cylinder 21. The spinneret 7 includes an upper cylindrical base 24 and a lower spinneret cylinder 25. The upper part of the cylindrical base 24 is connected to the lower inner hole of the spinneret mounting sleeve 6, and the lower part of the cylindrical base 24 is connected to the lower inner hole of the water-cooled positioning sleeve 9. The spinneret cylinder 25 is inserted into the heat exchange sleeve 23, and the spinneret hole 8 is opened on the bottom end face of the spinneret cylinder 25 and axially penetrates the spinneret 7.

[0059] Preferably, the spinneret hole 8 on the spinneret cylinder 25 can be a single hole or a plurality of holes arranged in a dispersed manner.

[0060] As a further improvement to the spinneret structure in this invention, there are several spinneret cylinders 25, which are integrally and independently connected to the lower end face of the cylinder base 24. There are multiple heat exchange sleeves 23, which are evenly arranged along the inner circumference of the sealed hollow cylinder 21 and extend axially to the upper and lower end faces of the sealed hollow cylinder 21. The number of spinneret cylinders 25 is the same as the number of heat exchange sleeves 23, and they are inserted into the heat exchange sleeves 23 one by one.

[0061] By modifying the single spinneret cylinder 25 at the bottom of the spinneret 7 into a new structure with several dispersed spinneret cylinders 25, and by matching it with a sealed hollow cylinder 21 adapted to the new structure of the dispersed spinneret cylinders 25, a large-capacity, high-efficiency condensation-evaporation heat exchange spinneret temperature self-balancing component 20 is formed in a limited and compact installation space. It has a large heat exchange capacity, reliable operation, and high efficiency.

[0062] Preferably, an aerogel heat insulation coating 36 is provided on the outer circular surface of the sealed hollow cylinder 21 and the back end surface of the hollow rectangular flange 26 to reduce the transfer of heat below.

[0063] The working principle of the spinneret temperature self-balancing component 20 is as follows: When the temperature of the lower part of the spinneret cylinder 25 of the spinneret 7 is too high, heat will be transferred to the lower part of the sealed hollow cylinder 21, thereby causing the temperature of the lower part of the sealed hollow cylinder 21 to rise as well. When the temperature exceeds the set value, the deionized water 22 in the sealed hollow cylinder 21 evaporates and rises to the top under a high vacuum environment. Since the top hollow rectangular flange 26 of the sealed hollow cylinder 21 is connected to the bottom of the liquid insulation box 4, its temperature is relatively low, thereby triggering water vapor condensation. The condensate falls back to the bottom of the sealed hollow cylinder 21 by its own weight, causing the temperature of the bottom of the sealed hollow cylinder 21 to drop, forming a high-efficiency gravity heat pipe circulation, thereby suppressing the temperature rise of the lower part of the spinneret cylinder 25 of the spinneret 7.

[0064] Preferably, the coefficient of thermal expansion of the heat exchange sleeve 23 is less than that of the spinneret cylinder 25, thereby enabling a micro-gap sliding fit between the heat exchange sleeve 23 and the spinneret cylinder 25 under normal operating conditions, which facilitates the disassembly and replacement of the spinneret assembly; at the same time, it enables an interference fit between the heat exchange sleeve 23 and the spinneret cylinder 25 under high-temperature operating conditions, thereby enhancing the reliability of contact heat transfer under high-temperature operating conditions.

[0065] As a further improvement of this embodiment, an enhanced condensation assembly is provided between the liquid insulation tank 4 and the hollow rectangular flange 26 of the sealed hollow cylinder 21. The assembly includes N closed condenser pipes 27 that are erected on the hollow rectangular flange 26. The N closed condenser pipes 27 are distributed around the upper surface of the hollow rectangular flange 26. The lower end of the closed condenser tube 27 is connected to the inner cavity of the hollow rectangular flange 26, and the upper end of the closed condenser tube 27 extends upward and is inserted into the circulating cooling medium 28 of the liquid insulation tank 4. Preferably, a sealing ring is provided between the bottom end face of the liquid insulation tank 4 and the upper end face of the hollow rectangular flange 26 to prevent leakage at the bottom of the liquid insulation tank 4.

[0066] The inner wall of the closed condenser tube 27 forms an additional enhanced condensation heat exchange surface, which is used to accelerate the condensation and liquefaction of the working fluid vapor, and guides the condensate back to the bottom of the sealed hollow cylinder 21 by gravity.

[0067] Since the closed condenser tube 27 is placed directly in the circulating cooling medium 28 of the liquid insulation tank 4, the efficiency of steam condensation is further improved.

[0068] As a preferred embodiment of the sealed hollow cylinder 21, the sealed hollow cylinder 21 is provided with a phase change synergistic enhancement structure 29 for improving the stability of the gravity heat pipe circulation. The phase change synergistic enhancement structure 29 includes a number of vertical fins 30 built into the sealed hollow cylinder 21 and connected to the outer circle of the heat exchange sleeve 23 in the vertical direction, and a phase change heat absorption material 31 built into the vertical fins 30. The number of vertical fins 30 are distributed circumferentially along the outer circle of the heat exchange sleeve 23.

[0069] Preferably, the phase change heat-absorbing material 31 is a paraffin-based composite phase change material with paraffin as the main component and containing a composite formula, and its phase change temperature is 5-10℃ higher than the water vapor condensation temperature inside the sealed hollow cylinder 21.

[0070] Preferably, the paraffin-based composite phase change material is composed of n-alkanes (e.g., C24-C30) with different carbon chain lengths mixed in different proportions, and is equipped with 5-10% thermal conductivity enhancer to form a certain phase change temperature range; the thermal conductivity enhancer is one or more of expanded graphite, copper powder or aluminum powder.

[0071] Preferably, the mass ratio of n-alkanes in the paraffin-based composite phase change material is 5-30% for C24, 40-55% for C26, 15-35% for C28, and 0-20% for C30. This formulation can form a paraffin-based composite phase change material with a phase change temperature range of 55-65℃.

[0072] Preferably, the filling rate of the composite phase change material in the internal cavity of the vertical fin 30 is 80-90%.

[0073] The working principle of the phase change synergistic enhancement structure 29 is as follows: when the heat load suddenly increases (5-10℃ higher than the heat pipe condensation temperature), the phase change heat-absorbing material 31 absorbs heat and melts, buffering the temperature peak and preventing the heat pipe heat transfer limit from being overloaded; when the heat load decreases, the phase change heat-absorbing material 31 releases heat and solidifies, maintaining temperature stability and preventing the spinneret 7 from being overcooled.

[0074] By integrating a phase change synergistic enhancement structure (vertical fins with built-in specially formulated phase change material) and a reinforced condensation component (closed condenser tubes directly inserted into the cooling circulation medium of the liquid insulation tank) into the spinneret temperature self-balancing component, the system's thermal response speed and thermal shock resistance are greatly improved. Even during process fluctuations, the absolute reliability of temperature control can be guaranteed, ensuring long-term continuous and stable operation of the spinning process. This has a significant effect on maintaining the extreme stability of the spinning process.

[0075] In this embodiment, the rectifier plate is a biomimetic breathing rectifier plate. The biomimetic breathing rectifier plate 10 is formed by at least an upper honeycomb core 13 and a lower honeycomb core 14 stacked in a staggered manner. A rectifier plate hot air temperature and flow rate adaptive adjustment controller 32 is provided between the upper and lower honeycomb cores to adaptively adjust the hot air flow rate with the hot air temperature. The rectifier plate hot air temperature and flow rate adaptive adjustment controller 32 includes an inverted V-shaped bimetallic sheet 33 that is suspended in each polygonal air duct 15 of the lower honeycomb core 14. The upper tip of the inverted V-shaped bimetallic sheet 33 is fixed to the solid edge 34 at the lower end of the polygonal air duct 15 of the upper honeycomb core 13 by ultrasonic welding.

[0076] Preferably, the surface of the V-shaped bimetallic strip 33 is provided with a DMAC solvent-resistant protective layer, which has good corrosion resistance and a long service life.

[0077] The working principle of the biomimetic breathing-type rectifier plate's hot air temperature and flow adaptive adjustment controller 32: The V-shaped bimetallic strip 33 bends and deforms with temperature changes, causing the opening angle of the V-shaped bimetallic strip 33 to change. This opening and closing deformation action of the V-shaped bimetallic strip 33, which increases and decreases with temperature fluctuations, forms a biomimetic breathing mechanism. When the overall hot air temperature passing through the rectifier plate 10 deviates from the set value, the adaptive change of the opening angle of the V-shaped bimetallic strip 33 can adjust the flow area of ​​the polygonal air duct 15 on the honeycomb core layer 12. When the hot air temperature is too high, the opening angle of the V-shaped bimetallic strip 33 increases, resulting in a decrease in the flow area; when the hot air temperature is too low, the opening angle of the V-shaped bimetallic strip 33 decreases, resulting in a decrease in the flow area. The reduced opening angle of plate 33 leads to an increased flow area, enabling adaptive adjustment of the hot air flow rate into channel 35. This adjustment of the hot air flow rate into channel 35 restores the temperature within channel 35 to the target value. In areas of higher hot air temperature on rectifier plate 10, the V-shaped angle increases, increasing the blocking area and automatically reducing the hot air flow rate. Conversely, in areas of lower hot air temperature on rectifier plate 10, the V-shaped angle decreases, reducing the blocking area and automatically increasing the hot air flow rate. This forms a negative feedback adaptive adjustment mechanism, which helps to create uniform hot air throughout channel 35, improving the uniformity of hot air temperature at various points within channel 35, thereby further improving the quality and consistency of spandex spinning.

[0078] As an application of this embodiment on the spandex spinning channel 35, the component mounting base 1 is installed at the upper entrance of the square channel 35, and the spinneret assembly 5 is arranged in a rectangular array on the component mounting base 1.

[0079] As another application of this embodiment on the spandex spinning channel 35, the component mounting base 1 can also be installed at the upper entrance of the circular channel. In this case, the component mounting base 1 adopts a circular component mounting base, and its air duct groove 2 and component mounting groove 3 both adopt annular grooves. The spinneret assembly 5 is arranged in a multi-ring array on the component mounting base 1 (number of rings ≥ 3 rings).

[0080] As a further improvement of this embodiment, the spandex spinning device is provided with a yarn feeding box anti-hanging and escaping mechanism. The yarn feeding box anti-hanging and escaping mechanism includes a channel top airflow disturbance device 37 provided on the component mounting base 1. The channel top airflow disturbance device 37 includes an intermediate opening and closing control valve 38 provided in the middle of the air duct 2 of the component mounting base 1 and a frequency conversion pulse opening and closing valve 40 respectively provided on the external air inlet pipes 39 at both ends of the air duct 2. The yarn feeding box anti-hanging and escaping mechanism also includes a number of infrared ranging probes 41 provided on the channel door 48 at the lower end of the spandex spinning channel 35. The infrared ranging probes 41 are distributed on the channel door 48 and their detection direction is upward.

[0081] Preferably, the intermediate opening and closing control valve 38 is a 90-degree deflection valve, which includes a miniature angle motor 42 disposed on the upper end face of the component mounting base 1 and a plate-type rotating door 43 vertically disposed in the middle position of the air duct 2. The motor shaft of the miniature angle motor 42 is inserted into the air duct 2 and connected to the plate-type rotating door 43. The plate-type rotating door 43 is parallel to the direction of the air duct 2 in the initial state. When the plate-type rotating door 43 rotates through a 90-degree angle, it can cut off the middle air duct of the air duct 2.

[0082] Among them, the upper chamber 61 and the lower chamber 62 of the air duct 2 are respectively provided with plate-type rotating doors 43, which are respectively fixed to the motor shaft of the micro angle motor 42 through connecting sleeves 63.

[0083] In the above-mentioned anti-hanging and escape mechanism for the wire feeding box, the working principle of the airflow disturbance device 37 at the top of the channel is as follows: external hot air enters from both ends of the air duct 2. Under normal feeding conditions, the intermediate opening and closing control valve 38 located in the middle of the air duct 2 is in an open state. When the infrared ranging probe 41 connected to the spandex spinning control system detects that the wire feeding box is hanging in the channel 35, the control system cuts off the air duct 2 in the middle position through the intermediate opening and closing control valve 38, and at the same time alternately switches the frequency conversion pulse opening and closing valve 40, thereby breaking the balance of airflow in the channel 35, so that there is a strong airflow in a local area and a weak airflow in another local area in the channel 35, forming an alternating change of airflow strength. The strong fluctuation of airflow will make the hanging wire feeding box smoothly detach from the inner wall of the channel and fall smoothly.

[0084] Preferably, a bottom airflow enhancement and disturbance device 44 is provided on the tunnel door 48. The bottom airflow enhancement and disturbance device 44 includes a number of nitrogen nozzles 45 that are disposed upward on the tunnel door 48 and are located circumferentially near the inner wall of the tunnel. The nitrogen nozzles 45 are connected to a nitrogen delivery pipe 46. The nitrogen nozzles 45 are controlled by a nitrogen injection control valve 47 provided on the nitrogen delivery pipe 46. The nitrogen nozzles 45 cooperate with the top airflow disturbance device 37 to enhance the non-uniformity of the airflow in the lower part of the tunnel 35 and improve the reliability of the wire feeding box in preventing it from getting stuck.

[0085] The working principle of the above-mentioned airflow enhancement and disturbance device 44 at the bottom of the tunnel is as follows: When the wire feeding box is suspended, the control system determines the attitude of the wire feeding box based on the ranging results of multiple infrared ranging probes 41, and selectively opens or alternately opens and closes several nitrogen nozzles 45 through the nitrogen injection control valve 47; when the nitrogen airflow is injected upward from the local area at the bottom of the tunnel 35, it will form a local enhanced airflow in the tunnel 35 below the wire feeding box, thereby breaking the air cushion effect at the bottom of the wire feeding box. It forms a synergistic effect with the airflow disturbance of the top air duct, realizing bidirectional airflow disturbance and accelerating the wire feeding box's escape.

[0086] Preferably, a plurality of probe purgers 49 are provided inside the door frame 65 of the passageway door 48. Each probe purger 49 includes an extension tube 50 inserted from the outside into the inside of the door frame 65, and an oblique nozzle 51 located at the front end of the extension tube 50 and obliquely aligned with the infrared ranging probe 41. The extension tube 50 is connected to the annular high-pressure nitrogen buffer tank 57, and a pulse valve 55 is provided on the extension tube 50 to perform pulse cleaning on the infrared ranging probe 41 before detection, thereby improving detection accuracy.

[0087] The control logic for the coordinated operation of the aforementioned airflow enhancement and disturbance device 44 at the bottom of the tunnel and the airflow disturbance device 37 at the top of the tunnel can be to activate only the airflow disturbance device 37 at the top of the tunnel, or only the airflow enhancement and disturbance device 44 at the bottom of the tunnel, or to activate both the airflow enhancement and disturbance device 44 at the bottom of the tunnel and the airflow disturbance device 37 at the top of the tunnel simultaneously, forming a coordinated airflow disturbance in both directions.

[0088] Preferably, the nitrogen delivery pipe 46 connected to the nitrogen nozzle 45 includes a pulse-jet nitrogen delivery pipe 52 and a directional blasting nitrogen delivery pipe 53. The pulse-jet nitrogen delivery pipe 52 and the directional blasting nitrogen delivery pipe 53 are connected in parallel and connected to the nitrogen nozzle 45 through a three-way pipe 54. The nitrogen injection control valve 47 on the pulse-jet nitrogen delivery pipe 52 is a pulse valve 55, and the nitrogen injection control valve 47 on the directional blasting nitrogen delivery pipe 53 is a quick-release valve 56. The nitrogen delivery pipe 46 is connected to an annular high-pressure nitrogen buffer storage tank 57.

[0089] The annular high-pressure nitrogen buffer tank 57 is installed on the outside of the door frame 65 of the passageway door 48 by means of a supporting angle iron.

[0090] Preferably, the pulse valve 55 on the pulse-jet nitrogen delivery pipe 52 is connected to the annular high-pressure nitrogen buffer tank 57 via a pressure regulating valve 66 to regulate the pulse pressure.

[0091] Preferably, each of the directional blasting nitrogen delivery pipes 53 is connected to the same annular high-pressure nitrogen buffer storage tank 57.

[0092] During operation, the pulse valve 55 or the quick release valve 56 can be selectively opened according to the test results to output the required pulse nitrogen gas flow or directional explosive nitrogen gas flow.

[0093] Example 2: A spinning method using the vertical blowing uniform temperature hot air approximation surrounding spandex spinning device of Example 1 includes the following steps: S1. Airflow homogenization control steps: The external hot air source is activated, and the hot air enters the layered hot air space 18 from both ends of the air duct 2. After being horizontally diffused and homogenized in the layered hot air space 18, it passes downward through the rectifier plate 10 to form a vertically downward uniform hot air flow that is close to surrounding the fine flow of spinning liquid. The rectifier plate 10 adopts a three-dimensional honeycomb structure with several honeycomb core layers 12 arranged in a staggered manner. The polygonal air ducts 15 of adjacent honeycomb core layers 12 are staggered to form a micro-resistance for the hot air to pass downward through the rectifier plate 10, ensuring that the hot air is horizontally uniformly diffused in the layered hot air space 18 before flowing downward out of the rectifier plate 10. S2. Spinneret Temperature Self-Balancing Control Step: The spinning solution is sprayed downward from the spinneret hole 8 of the spinneret 7 to form a fine stream of spinning solution. The uniformly heated airflow output downward by the rectifier plate 10 approaches and surrounds each fine stream of spinning solution. When the temperature of the lower spinneret cylinder 25 of the spinneret 7 becomes too high due to the hot air, the heat is transferred from the spinneret cylinder 25 to the lower end of the sealed hollow cylinder 21. The deionized water 22 in the sealed hollow cylinder 21 evaporates in a high vacuum environment and rises to the top. It condenses under the cooling effect of the liquid insulation box 4. The condensed deionized water 22 falls back to the bottom of the sealed hollow cylinder 21 by its own weight, forming a gravity heat pipe circulation, which suppresses the temperature rise of the lower spinneret cylinder 25 of the spinneret 7 and controls the working temperature of the spinneret 7 within the set range of 55-80℃. S3, Solvent flash curing step: Under the action of hot air and high temperature, the DMAC solvent in the spinning solution is flashed to obtain spandex yarn.

[0094] Preferably, the hot air input temperature is controlled within the range of 245-300℃, the hot air temperature in the upper part of the tunnel 35 is not lower than 240-250℃, and the hot air temperature in the middle part of the tunnel 35 is not lower than 210-220℃.

[0095] As a further improvement, the spinning method of the vertical blowing uniform temperature hot air approximation surrounding spandex spinning device in this embodiment also includes a method for preventing the feeding box from snagging and getting stuck, the getting-stuck method including the following three stages: Phase 1: Directional blasting escape phase; When the infrared ranging probe 41 detects that the wire-feeding box is suspended, the control system identifies the probe number and distance value corresponding to the position where the wire-feeding box is attached to the inner wall of the tunnel, and then controls the quick release valve 56 on the directional blasting nitrogen delivery pipe 53 directly below the attachment position to open instantly, and the high-pressure nitrogen in the annular high-pressure nitrogen buffer tank 57 is released instantly, spraying upward from the bottom of the tunnel 35 to the attachment position of the wire-feeding box, generating a blasting impact force to detach the wire-feeding box from the inner wall of the tunnel; Preferably, the blasting pressure is set to 0.8-1.2MPa, the duration of a single blast is 50-100ms, and there are a maximum of 3 blasts with an interval of 2 seconds between each blast; when the infrared ranging probe 41 detects that the decrease in the distance value of each point exceeds the preset threshold, it is determined that the escape is successful and the second stage is entered. The second stage: pulsed airflow coordinated attitude correction and horizontal descent stage; the attitude of the wire feeding box is tracked in real time by infrared ranging probe 41, and the maximum difference ΔD of the distance values ​​of each measuring point and the tilt angle θ are calculated; when the tilt of the wire feeding box is detected, the variable frequency pulse opening and closing valves 40 at both ends of the airflow disturbance device 37 at the top of the tunnel are controlled to alternately or synchronously switch pulses, with a pulse frequency of 0.5-2Hz and an air volume adjustable from 20-80%; at the same time, the nitrogen nozzles 45 of the airflow enhancement disturbance device 44 at the bottom of the tunnel are controlled to selectively open or alternately open-close, with a nitrogen pressure adjustable from 0.1-0.5MPa and a pulse frequency synchronized with the top; according to the tilt direction of the wire feeding box, the airflow enhancement part is controlled to generate a corrective torque until the maximum difference ΔD of the distance values ​​of each measuring point is less than the set threshold of 100mm, and the attitude is judged to be basically horizontal; The third stage: restoring balanced airflow; after the wire feeding box is corrected to a horizontal position, the top air duct middle opening and closing control valve 38 is restored to the open state, the two end frequency conversion pulse opening and closing valves 40 are opened simultaneously, and the bottom nitrogen nozzle 45 is closed, so that the wire feeding box falls horizontally to the bottom of the passageway 35 under the action of balanced airflow; the infrared ranging probe 41 determines that the wire feeding box has landed based on the range of the ranging data, the escape is completed, and normal production is restored.

[0096] When the wire feeding box is suspended, its attachment point to the tunnel wall is usually higher than other parts of the box. Traditionally, this is done manually with a long pole, which involves pushing the attachment point upwards to allow it to fall automatically after detachment. This patent employs a three-stage operation. The first stage uses local airflow strength differences to simulate manual pushing with a pole. The second stage (after the wire feeding box detaches from the tunnel wall) uses reverse airflow control to correct the box's posture (an infrared detection probe tracks its posture in real time). The third stage restores normal, balanced airflow, allowing it to fall horizontally.

[0097] Preferably, a pre-stage short-term pulse probing escape stage is set before the first stage (directional blasting escape stage): when the infrared ranging probe 41 detects the wire-feeding box hovering, the control system identifies the probe number and distance value corresponding to the wire-feeding box's attachment position; it controls the pulse valve 55 on the pulse-jet nitrogen delivery pipe 52 directly below the attachment position to open intermittently, performing 1-2 pulse probing escape attempts. The duration of a single pulse is 200-300ms, the number of pulses is 3-5, the pulse interval is 400-500ms, and the nitrogen pressure is [not specified]. 0.4-0.6MPa; Simultaneously control the alternating pulse switching of the variable frequency pulse valves 40 at both ends of the airflow disturbance device 37 at the top of the tunnel, with a pulse frequency of 0.5-1Hz and an air volume of 30-50%; When the infrared ranging probe 41 detects that the distance value drops beyond the set threshold, the control system determines that the pulse test escape is successful, skips the first stage and directly enters the second stage; When the distance value (within the given error change range) remains unchanged after 1-2 pulse tests, it is determined that the pulse test escape has failed and enters the first stage; Directional blasting is only used when short-term pulse probing fails to extricate the trapped object. This helps reduce the number of directional blasts and thus the workload of attitude adjustment.

[0098] If the wire feeding box fails to fall after several consecutive directional blasts, the control system will issue an alarm to prompt manual intervention.

[0099] This embodiment, through the systematic reconstruction of the hot air system, spinneret cooling system, and wire feeding box auxiliary system, not only solves the long-standing problems of quality fluctuations and safety hazards in dry spinning of spandex from the source, but also provides a brand-new technical path to achieve high-quality, high-efficiency, and intelligent spandex production.

[0100] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A vertically blown, uniformly heated hot air approximation surround-type spandex spinning device, characterized in that, include: The component mounting base has several rows of parallel air duct grooves on its lower end face and several rows of component mounting slots on its upper end face. Each row of component mounting slots is located between two adjacent rows of air duct grooves in the vertical projection direction. The liquid insulation tank is fixed at the top by a support positioning plate connected to the component mounting base, and at the bottom is installed in the component mounting slot to contain the circulating cooling medium. A spinneret assembly, several sets of the spinneret assemblies are installed on the liquid insulation tank, each set of the spinneret assembly includes a spinneret plate mounting sleeve, a spinneret plate installed and connected to the inner hole of the lower end of the spinneret plate mounting sleeve, and several spinneret holes opened on the spinneret plate. A water-cooled positioning sleeve is provided on the liquid insulation tank, and the spinneret mounting sleeve is fixedly inserted into the water-cooled positioning sleeve; The rectifier plate, employing a three-dimensional honeycomb structure with multiple layers of honeycomb cores arranged in a staggered manner, is horizontally positioned below the component mounting base. Spacer holes are provided on the rectifier plate directly opposite the spinneret. The rectifier plate comprises at least two honeycomb core layers and a filter layer. The filter layer is positioned above the top honeycomb core layers. Each honeycomb core layer has regularly arranged polygonal air ducts, with the polygonal air ducts of adjacent honeycomb core layers staggered. Through the combination of the filter and the honeycomb core layers, a slight air resistance is generated between the layers, causing the hot air to be homogenized first within the upper layered hot air space, and then rectified by the rectifier plate before passing downwards. A hot air diaphragm is provided on the back of the component mounting groove and extends downward into the diaphragm hole and mates with the diaphragm hole. The bottom of the component mounting groove is provided with a number of bottom holes at intervals, and the upper end of the hot air diaphragm is connected to the bottom holes. The lower end of the spinneret extends downward into the internal cavity of the hot air diaphragm; a layered hot air space is formed between the rectifier plate and the component mounting base, and the layered hot air space and the rectifier plate form an integral air outlet; the layered hot air space is connected to an external hot air source through the air duct groove. The air duct is horizontally provided with an intermediate combined filter layer formed by stacking a perforated plate and a filter screen. The intermediate combined filter layer divides the air duct into an upper air duct chamber and a lower air duct chamber. The external hot air source is connected to the upper air duct chamber, and the lower air duct chamber is connected to the layered hot air space.

2. The vertically blown uniform hot air approximation surround type spandex spinning device according to claim 1, characterized in that, It also includes a spinneret temperature self-balancing assembly for preventing overheating of the lower part of the spinneret, which includes: A sealed hollow cylinder is coaxially disposed in the lower inner hole of the water-cooled positioning sleeve and extends downward into the hot air diaphragm sleeve; a hollow rectangular flange is provided on the upper part of the sealed hollow cylinder, the hollow rectangular flange is located between the bottom of the liquid insulation tank and the component mounting groove and is fixedly fitted to the bottom end face of the liquid insulation tank, and the inner cavity of the hollow rectangular flange is connected to the inner cavity of the sealed hollow cylinder; the inner cavity of the sealed hollow cylinder is in a high vacuum state and is filled with deionized water accounting for 35%-45% of the inner cavity volume as the evaporation-condensation working fluid; A heat exchange jacket is disposed inside the sealed hollow cylinder and extends axially to the upper and lower end faces of the sealed hollow cylinder. The spinneret includes an upper cylindrical base and a lower spinneret cylinder. The upper part of the cylindrical base is connected to the lower inner hole of the spinneret mounting sleeve, and the lower part of the cylindrical base is connected to the lower inner hole of the water-cooled positioning sleeve. The spinneret cylinder is inserted into the heat exchange sleeve, and the spinneret hole is opened on the bottom end surface of the spinneret cylinder and axially penetrates the spinneret.

3. The vertically blown uniform hot air approximation surround type spandex spinning device according to claim 2, characterized in that, An enhanced condensation assembly is also provided between the liquid insulation tank and the hollow rectangular flange of the sealed hollow cylinder, which includes N closed condenser pipes that are erected upwards on the hollow rectangular flange, and the N closed condenser pipes are distributed around the upper end face of the hollow rectangular flange. The lower end of the closed condenser tube is connected to the inner cavity of the hollow rectangular flange, and the upper end of the closed condenser tube extends upward and is inserted into the circulating cooling medium of the liquid insulation tank. The inner wall of the closed condenser tube forms an additional enhanced condensation heat exchange surface, which is used to accelerate the condensation and liquefaction of the working fluid vapor, and guides the condensate back to the bottom of the sealed hollow cylinder by gravity.

4. The vertically blown uniform-temperature hot air approximation surround type spandex spinning device according to claim 2, characterized in that, An aerogel heat insulation coating is provided on the outer circular surface of the sealed hollow cylinder and the back end face of the hollow rectangular flange.

5. The vertically blown uniform hot air approximation surround type spandex spinning device according to claim 1, characterized in that, The rectifier is a biomimetic breathing rectifier, which is formed by at least two layers of honeycomb cores stacked in a staggered manner. A rectifier hot air temperature and flow rate adaptive adjustment controller is provided between the two layers of honeycomb cores. The rectifier hot air temperature and flow rate adaptive adjustment controller includes an inverted V-shaped bimetallic sheet suspended in each polygonal air duct of the lower honeycomb core. The upper tip of the inverted V-shaped bimetallic sheet is fixed to the solid edge of the lower end of the polygonal air duct of the upper honeycomb core by ultrasonic welding.

6. The vertically blown uniform-temperature hot air approximation surround type spandex spinning device according to claim 1, characterized in that, The spandex spinning device is equipped with a yarn feeding box anti-hanging and escaping mechanism. The yarn feeding box anti-hanging and escaping mechanism includes an airflow disturbance device at the top of the tunnel, which is mounted on the component mounting base. The airflow disturbance device at the top of the tunnel includes an intermediate opening and closing control valve located in the middle of the air duct of the component mounting base and frequency conversion pulse opening and closing valves respectively located on the external air inlet pipes at both ends of the air duct. The yarn feeding box anti-hanging and escaping mechanism also includes a number of infrared ranging probes located on the tunnel door at the lower end of the spandex spinning tunnel. The infrared ranging probes are distributed on the tunnel door and their detection direction is upward.

7. The vertically blown uniform hot air approximation surround type spandex spinning device according to claim 1, characterized in that, An airflow enhancement and disturbance device for the bottom of the tunnel is installed on the tunnel door. The airflow enhancement and disturbance device for the bottom of the tunnel includes a number of nitrogen nozzles that are arranged upward on the tunnel door and circumferentially close to the inner wall of the tunnel. The nitrogen nozzles are connected to nitrogen delivery pipes and are controlled by nitrogen injection control valves installed on nitrogen delivery pipes. The device works in conjunction with the airflow disturbance device at the top of the tunnel to compensate for the unevenness of the airflow in the lower part of the tunnel and improve the reliability of the wire feeding box in preventing it from getting stuck.

8. The vertically blown uniform hot air approximation surround type spandex spinning device according to claim 1, characterized in that, The nitrogen delivery pipe connected to the nitrogen nozzle includes a pulse-jet nitrogen delivery pipe and a directional blasting nitrogen delivery pipe. The pulse-jet nitrogen delivery pipe and the directional blasting nitrogen delivery pipe are connected in parallel and connected to the nitrogen nozzle through a tee pipe. The nitrogen injection control valve on the pulse-jet nitrogen delivery pipe is a pulse valve, and the nitrogen injection control valve on the directional blasting nitrogen delivery pipe is a quick-release valve. The nitrogen delivery pipe is connected to an annular high-pressure nitrogen buffer storage tank.

9. A spinning method using a vertically blown uniformly heated hot air approximation enclosed spandex spinning device according to any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Airflow homogenization control steps: The external hot air source is activated, and the hot air enters the layered hot air space from both ends of the air duct. After being horizontally diffused and homogenized in the layered hot air space, it passes downward through the rectifier plate to form a vertically downward uniform hot air flow that closely surrounds the fine flow of spinning solution. The rectifier plate adopts a three-dimensional honeycomb structure with several honeycomb core layers arranged in a staggered manner. The polygonal air ducts of adjacent honeycomb core layers are staggered to form a micro-resistance for the hot air to pass downward through the rectifier plate, ensuring that the hot air is horizontally uniformly diffused in the layered hot air space before flowing downward out of the rectifier plate. S2. Spinneret Temperature Self-Balancing Control Step: The spinning solution is ejected downwards from the spinneret orifices to form fine spinning solution streams. The uniformly heated airflow output downwards by the rectifier plate approaches and surrounds each fine spinning solution stream. When the temperature of the lower spinneret cylinder is too high due to the hot air, the heat is transferred from the spinneret cylinder to the lower end of the sealed hollow cylinder. The deionized water in the sealed hollow cylinder evaporates in a high vacuum environment and rises to the top. It condenses under the cooling effect of the liquid insulation box. The condensed deionized water falls back to the bottom of the sealed hollow cylinder by its own weight, forming a gravity heat pipe circulation, which suppresses the temperature rise of the lower spinneret cylinder and controls the working temperature of the spinneret within the set temperature range. S3, Solvent flash curing step: Under the action of hot air and high temperature, the DMAC solvent in the spinning solution is flashed to obtain spandex yarn.

10. The spinning method of a vertically blown uniformly heated air approximation surround-type spandex spinning device according to claim 9, characterized in that, It also includes a method for preventing the wire feeding box from hovering and getting out of trouble, which includes the following three stages: Phase 1: Directional blasting escape phase; When the infrared ranging probe detects that the wire-feeding box is suspended, the control system identifies the probe number and distance value corresponding to the position where the wire-feeding box is attached to the inner wall of the tunnel, and then controls the quick release valve on the directional blasting nitrogen delivery pipe directly below the attachment position to open instantly. The high-pressure nitrogen in the annular high-pressure nitrogen buffer tank is released instantly and sprayed upward from the bottom of the tunnel to the attachment position of the wire-feeding box, generating an explosive impact force to detach the wire-feeding box from the inner wall of the tunnel; When the infrared ranging probe detects that the decrease in the distance value at each point exceeds the preset threshold, it is determined that the escape was successful and the process enters the second stage. The second stage: pulsed airflow coordinated attitude correction and horizontal descent stage; the attitude of the wire feeding box is tracked in real time by an infrared ranging probe, and the maximum difference ΔD of the distance values ​​of each measuring point and the tilt angle θ are calculated; when the tilt of the wire feeding box is detected, the variable frequency pulse opening and closing valves at both ends of the airflow disturbance device at the top of the tunnel are controlled to alternately or synchronously switch on and off; at the same time, the nitrogen nozzles of the airflow enhancement disturbance device at the bottom of the tunnel are controlled to selectively open or alternately open and close; according to the tilt direction of the wire feeding box, the airflow enhancement part is controlled to generate a corrective torque until the maximum difference ΔD of the distance values ​​of each measuring point is less than the set threshold, and the attitude is determined to be basically horizontal; The third stage: restoring balanced airflow; after the wire feeding box is corrected to a horizontal position, the opening and closing control valve in the middle of the top air duct is restored to the open state, the variable frequency pulse opening and closing valves at both ends are opened simultaneously, and the nitrogen nozzle at the bottom is closed, so that the wire feeding box falls horizontally to the bottom of the tunnel under the action of balanced airflow; the infrared ranging probe determines that the wire feeding box has landed based on the range of the ranging data, the escape is completed, and normal production is restored.

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