A spinning method based on a spinning microenvironment system

Abstract

The present application relates to a kind of spinning method based on spinning microenvironment system, in spinning process, constant temperature and humidity airflow is delivered to each spinning unit by variable cross-section air supply pipeline, the air flow and airflow speed in each spinning unit are equal;All spinning units are independently connected with variable cross-section air supply pipeline by branch pipe, the cross-sectional area of all branch pipes is equal, and equal to the cross-sectional area of variable cross-section air supply pipeline output end, all branch pipes are equidistantly distributed along the length direction of variable cross-section air supply pipeline, interval is spinning unit's spindle pitch L;The section of variable cross-section air supply pipeline is circular, square or rectangular, the cross-sectional area, length or width from airflow input end to output end is uniformly reduced;Each spinning unit has unit fairing respectively by fairing main body and guide vane, and guide vane is the porous plate with uniform through hole along the thickness direction.The microenvironment temperature and humidity of the spinning unit drafting zone of the present application are stable, and the yarn quality and production efficiency are effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of spinning technology and relates to a spinning method based on a spinning microenvironment system. Background Technology

[0002] Currently, there are three commonly used spinning technologies in the world: ring spinning, rotor spinning, and vortex spinning. Ring spinning has a history of more than 250 years; rotor spinning began to be used in the 1960s; and vortex spinning began to be used at the beginning of this century (it was only industrialized by Murata Manufacturing Co., Ltd. of Japan in 2002), and is currently the most advanced spinning technology in the world. Traditional ring spinning and vortex spinning are open-type spinning, while rotor spinning is closed-type spinning. Therefore, the spinning units of ring spinning and vortex spinning are greatly affected by the ambient temperature and humidity. The rotation speed of the drafting roller in vortex spinning (above 5000 rpm) is more than 30 times that of the drafting roller in ring spinning (160 rpm). The drafting roller in traditional ring spinning has almost no temperature rise, while the temperature rise of the front drafting roller in vortex spinning reaches 25-30℃. Therefore, the fluctuation of temperature and humidity has a very significant impact on the yarn quality and efficiency of vortex spinning equipment. It is an industry consensus that vortex spinning workshops must be equipped with refrigeration and air conditioning (there is no strict requirement for ring spinning) to ensure the stability of ambient temperature and humidity. However, ensuring that the temperature and humidity fluctuations of the vortex spinning unit are small and that the drafting rollers can dissipate heat is a pain point for the industry.

[0003] For example, Reference 1 (A Brief Analysis of the Influence on the Efficiency of No. 861 Vortex Spinning Machine. Cotton Textile Technology. 2010, No. 12, pp. 12-15. Article No.: 1001-7415(2010)12-0012-04) points out that "the number of efficiency losses caused by temperature and humidity fluctuations accounts for about 70% of the total number of efficiency losses." Reference 2 (Analysis of the Influencing Factors on the Yarn Quality of Pure Cotton Air-Jet Vortex Color Spinning. Cotton Textile Technology. 2020, No. 12, pp. 47-50. Article No.: 1000-7415(2020)12-0047-04) shows that when the temperature is 20℃, the influence on yarn quality indicators is not significant; when the temperature is 30℃, the difference in yarn quality changes significantly with the change in relative humidity, mainly manifested in the highest yarn breaking strength at a relative humidity of 58%; when the temperature is 40℃, both spinning quality and production efficiency are poor.

[0004] Traditional spinning speeds are relatively low (less than 25 m / min), while modern spinning speeds can reach over 400 m / min. During high-speed spinning, the high-speed rotation of the drafting rollers generates high temperatures, causing changes in the performance of the rubber rollers and aprons. This can lead to harmful phenomena such as yarn entanglement and poor drafting. Yarn entanglement can be addressed by maintaining the correct temperature and humidity in the workshop and by applying chemical coatings to the roller surfaces. Therefore, modern high-speed spinning requires a constant temperature and humidity standard operating environment to ensure the normal operation of the equipment. The current solution involves adding large-scale refrigeration equipment to the entire factory to regulate the temperature and humidity of the spinning unit. However, controlling the overall environment to maintain the factory's temperature and humidity has the following drawbacks:

[0005] (1) Poor uniformity of temperature and humidity in the environment; factors such as the location of air conditioning outlets, heat-generating parts of equipment, and proximity to doors and windows can lead to significant differences in temperature and humidity in spinning units; for example, reference 3 (Methods and practices for improving the uniformity of temperature and humidity in spinning workshops. Cotton Textile Technology. 2023, No. 5, pp. 59-52. Article No.: 1000-7415(2023)05-0059-04) mentions that "due to the significant impact of temperature and humidity on yarn strength, hairiness, and other indicators during the drafting, twisting, and forming processes of spinning, the quality of yarn produced by the same spinning machine varies, and excessively low or high relative humidity can lead to an increase in yarn breakage, affecting production efficiency."

[0006] (2) High energy consumption; due to the need to control the temperature and humidity of the entire factory to be stable, but the large space and poor insulation of the factory, the cooling capacity is increased.

[0007] (3) Flying hair and dust in the factory pollute the spinning drafting area; the existing spinning units are all open spinning, and flying hair and dust can easily enter the drafting area, resulting in yarn quality problems.

[0008] (4) The workshop air is polluted, which seriously affects the physical and mental health of workers. In order to maintain the temperature and humidity stability of the large workshop, based on energy saving and central air conditioning load considerations, the air conditioning units usually use internal circulation, and the fresh air supply is less.

[0009] To address the aforementioned issues, patent CN202410033042.9 discloses a spinning method and yarn for vortex spinning, which involves individual temperature control of the drafting zone of the spinning unit to improve yarn quality. However, this patent only describes a spinning process for special fibers, reducing the volatilization of chemical oils by cooling the fibers. Its drawbacks are: the introduction of cold air can easily cause fiber disorder in the yarn, affecting the fiber drafting quality; the cold air only acts on the yarn body and does not have a cooling effect on the entire drafting system; moreover, the biggest problem is that it cannot solve the issues of humidity stability in the drafting system and heat dissipation from the rollers; simultaneously, blowing air generates more fly waste, leading to yarn quality problems.

[0010] Therefore, it is of great significance to study a systematic solution to address the problems existing in the current technology. Summary of the Invention

[0011] The purpose of this invention is to solve the problems existing in the prior art and provide a spinning method based on a spinning microenvironment system.

[0012] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0013] A spinning method based on a spinning microenvironment system is disclosed. During the spinning process, constant temperature and humidity airflow is delivered to each spinning unit through a variable cross-section air supply duct. The airflow rate and velocity delivered to each spinning unit are equal. Each spinning unit is independently connected to the variable cross-section air supply duct through a branch pipe. The cross-sectional area of ​​all branch pipes is equal and equal to the cross-sectional area of ​​the output end of the variable cross-section air supply duct. All branch pipes are evenly distributed along the length of the variable cross-section air supply duct, and the spacing is equal to the spindle pitch L of the spinning unit.

[0014] The cross-section of the variable cross-section air supply duct is circular or square. The cross-sectional area of ​​the variable cross-section air supply duct decreases uniformly from the airflow inlet to the outlet, and the rate of change of the cross-sectional radius or side length is (1 / n). 1 / 2 Where n is the number of spinning units; for example Figure 2 The diagram shows a conventional variable cross-section main duct, where each section has different dimensions (one end larger, the other smaller), resulting in a complex manufacturing process unsuitable for mass production. Furthermore, the appearance is inconsistent and clashes with the overall design. This invention, however, employs a uniformly manufactured duct with a constant cross-section (maximum at the air inlet), using inclined plates at a uniform slope (1 / n). 1 / 2 A variable cross-section is achieved by dividing a uniform cross-section. This method has a standardized manufacturing process, simple technology, and low manufacturing cost, making it ideal for mass production; it also results in a uniform and aesthetically pleasing appearance.

[0015] Alternatively, the cross-section of the variable cross-section air supply duct is rectangular. The length or width of the cross-section of the variable cross-section air supply duct decreases uniformly from the airflow inlet to the outlet, and the rate of change of the uniformly decreasing length or width is 1 / n, where n is the number of spinning units.

[0016] The required airflow rate to achieve temperature and humidity balance in a single microenvironment is calculated to be Q1, and the airflow velocity does not interfere with fiber stretching. The airflow velocity is V (ignoring pipe friction loss, the flow velocity of the variable cross-section air supply pipe and the branch pipe is equal), and the cross-sectional area of ​​the air inlet branch of each microenvironment is S1 (the cross-sectional area of ​​each branch pipe remains unchanged).

[0017] in:

[0018] Q1 = V*S1 (1);

[0019] There are n spinning units (microenvironments), and the total flow rate of the variable cross-section air supply duct is Q;

[0020] Q = n * Q1 = n * V * S1 (2);

[0021] The cross-sectional area of ​​the airflow inlet of the variable cross-section air supply duct is S;

[0022] S = Q / V (3);

[0023] If the variable cross-section air supply duct is a constant cross-section air supply duct (S remains unchanged), the duct flow rate Q gradually decreases from the head end to the tail end. From equation (3), it can be concluded that the airflow velocity V also decreases proportionally. From equation (1), it can be concluded that the airflow flow rate Q1 of each microenvironment also decreases proportionally. This results in a large difference between the airflow flow rate Q1 of the microenvironment at the head end and the tail end of the duct.

[0024] To ensure that the microenvironmental airflow flow rate Q1 remains constant at both the beginning and end of the pipe, we can deduce from equation (1) that the airflow velocity V must remain constant. From equation (3), we can deduce that as the pipe flow rate Q decreases, the main pipe cross-section S also decreases proportionally (variable cross-section). Substituting equation (2) into equation (3), we get:

[0025] S = n * S1 (4);

[0026] As can be seen from equation (4), the cross-section of the airflow inlet of the variable cross-section air supply duct is n*S1, and the minimum cross-section at the end is S1. When the cross-section of the variable cross-section air supply duct is circular or square, the gradient rate of the cross-sectional radius or side length is (1 / n). 1 / 2 (S1 is moved to the left side of the formula, and the square root is taken from both the top and bottom). When the cross-section of the variable cross-section air supply duct is rectangular, the length or width of the cross-sectional area of ​​the variable cross-section air supply duct from the airflow inlet to the outlet is uniformly reduced, and the rate of change of the uniformly reduced length or width is 1 / n (S1 is moved to the left side of the formula, and the width or length that does not change is canceled from both the top and bottom).

[0027] Each spinning unit is equipped with a unit rectifier. The unit rectifier consists of a rectifier body and a guide plate. The guide plate is a perforated plate with uniform through holes along the thickness direction. The rectifier body surrounds the drafting area of ​​the spinning unit except for the bottom. That is, the bottom of the drafting area of ​​the spinning unit is open, and the airflow flows downward, while the upper part, as well as the front, back, left and right sides are surrounded by the rectifier body. The guide plate is installed inside the rectifier body and covers the upper part of the drafting area of ​​the spinning unit. It softens the introduced airflow through the evenly distributed small holes and avoids the airflow disturbing the drafted sliver.

[0028] During the spinning process, the temperature fluctuation range in each spinning unit is ±2℃ of the set value, and the humidity fluctuation range is ±2.5% of the set value.

[0029] This invention addresses the shortcomings of existing technologies by utilizing modern, sophisticated control technology to transform the method of controlling the temperature and humidity of the overall equipment environment into a precise "point-to-point" temperature and humidity control method. Analysis of the spinning process reveals that the drafting zone of the spinning unit is most affected by changes in ambient temperature and humidity. Therefore, a microenvironment for temperature and humidity control is established in the drafting zone of each spinning unit. Airflow from the central air conditioning system is evenly distributed to each spinning unit, and a unit rectifier hood creates a stable microenvironment in the drafting zone. Simulation technology is used to calculate the gas flow rate required to maintain temperature and humidity balance in each microenvironment. The gas flow rate is controlled, and then guided by a deflector plate to ensure the airflow acts evenly and gently throughout the system. This shift from controlling the temperature and humidity of the overall environment to controlling localized temperature and humidity not only increases accuracy but also significantly saves energy. Furthermore, the constant temperature and humidity airflow input within the drafting zone unit rectifier hood creates a slight positive pressure, preventing external fly waste and dust from entering the drafting zone and improving yarn quality. The workshop environment can be largely replenished with fresh outdoor air, while the temperature and humidity of the microenvironment remain unaffected, greatly improving the workshop working environment. This invention is a systematic solution based on the heat dissipation of the rollers in the entire drafting system, the balance of temperature and humidity, the volatilization of fiber oil, and the prevention of external fly waste from affecting drafting quality.

[0030] As a preferred technical solution:

[0031] As described above, in a spinning method based on a spinning microenvironment system, the inner wall of the variable cross-section air supply duct is equipped with a heat insulation layer to ensure that the delivered airflow is not affected by the external environment.

[0032] As described above, in a spinning method based on a spinning microenvironment system, all branch pipes are flexible hoses with a diameter greater than or equal to 100 mm. Patent CN202410033042.9 has a very small cold air outlet cross-section, and the output flow rate is insufficient to achieve the cooling purpose of the drafting system. A branch outlet diameter (i.e., flexible hose diameter) greater than or equal to 100 mm is necessary to meet the temperature and humidity balance requirements of the spinning unit. Furthermore, patent CN202410033042.9 only blows cold air towards the drafting area, and the open environment cannot achieve temperature and humidity balance. Due to the high ambient temperature and humidity, condensation will form on the drafting components (and the larger the volume of cold air, the more severe the condensation), affecting the drafting quality.

[0033] In the spinning method based on the spinning microenvironment system described above, the diameter of the through holes on the guide plate is 2-3 mm, and the proportion of through holes is 30-35%.

[0034] The spinning method based on the spinning microenvironment system described above adopts vortex spinning technology. The process flow is fiber → opening → carding → drawing → vortex spinning → yarn. The method of the present invention is not limited to vortex spinning, but is also applicable to open spinning processes.

[0035] In the spinning method based on the spinning microenvironment system described above, the air flow rate Q1 in each spinning unit is 7-8 m³ / s. 3 / h, airflow velocity less than or equal to 2m / s. Both ring spinning and vortex spinning are open-type spinning processes, and the drafting is greatly affected by temperature and humidity fluctuations. However, the ring spinning speed is low (the drafting roller speed is about 160 rpm), and the heat dissipation of the roller is basically in balance with the ambient temperature, so there is no heat dissipation problem. Controlling the overall workshop environment can basically ensure its requirements for ambient temperature and humidity. The rotation speed of the drafting roller in vortex spinning (above 5000 rpm) is more than 30 times that of the drafting roller in ring spinning (160 rpm). The drafting roller is the part of the drafting system that generates the most heat. Under normal conditions, the drafting roller of traditional ring spinning has almost no temperature rise during spinning, while the temperature rise of the drafting roller of vortex spinning reaches 25-30℃. Using the method of this invention, through multiple simulations and verifications, when the airflow output flow rate in each spinning unit reaches Q1 in a micro-environment and the airflow velocity is set to less than 2m / s, the temperature rise of the drafting roller is basically in balance (temperature rise 5-8℃).

[0036] The lower the airflow velocity in the microenvironment, the better, as this minimizes interference with the fiber's stretching state. However, the microenvironment also requires a certain airflow to remove the heat generated by the rollers. Through multiple simulations and verifications, the experimental results show that an airflow velocity of less than or equal to 2 m / s has virtually no impact on the fiber's stretching state.

[0037] As described above, in a spinning method based on a spinning microenvironment system, when the fiber is cotton and the yarn linear density is 14.8 tex, the temperature and humidity in each spinning unit during the spinning process are set to 26±2℃ and 52±2.5%, respectively. The yarn linear evenness is ≤15.5%, the number of kilometer knots (+200%) (i.e., the sensitivity threshold of the evenness meter is at +200%) is ≤60 knots / km, the single yarn breaking strength is ≥19 cN / tex, the single yarn strength variation coefficient is ≤9%, and the number of defects per 100,000 meters of yarn is ≤5 / 100km.

[0038] When the fiber is cellulose fiber and the yarn linear density is 14.8 tex, the temperature and humidity in each spinning unit during the spinning process are set to 28℃±2℃ and 55%±2.5%, respectively. The yarn linear uniformity is ≤15%, the number of knots per kilometer (+200%) is ≤50 / km, the single yarn breaking strength is ≥10.5cN / tex, the single yarn strength variation coefficient is ≤10%, and the number of yarn defects per 100,000 meters is ≤15 / 100km.

[0039] When the fiber is polyester fiber and the yarn linear density is 14.8tex, the temperature and humidity in each spinning unit during the spinning process are set to 28±2℃ and 58±2.5%, respectively. The yarn linear uniformity is ≤15%, the number of knots per kilometer (+200%) is ≤30 / km, the single yarn breaking strength is ≥22cN / tex, the single yarn strength variation coefficient is ≤10.5%, and the number of yarn defects per 100,000 meters is ≤15 / 100km.

[0040] As described above, in a spinning method based on a spinning microenvironment system, a constant temperature and humidity airflow is generated by an air conditioning unit and delivered to a variable cross-section air supply duct; the air conditioner is electrically connected to a system control box, which is used to control the temperature, humidity, and wind speed of the constant temperature and humidity airflow generated by the air conditioner. (Figure)

[0041] As described above, in a spinning method based on a spinning microenvironment system, a temperature and humidity sensor and a wind speed sensor are installed in the variable cross-section air supply duct. The temperature and humidity sensor and the wind speed sensor are electrically connected to the system control box. When the measured values ​​of the temperature and humidity sensor and the wind speed sensor deviate from the set temperature, humidity and wind speed of the constant temperature and humidity airflow, the system control box controls the air conditioning unit to make the measured values ​​of the temperature and humidity sensor and the wind speed sensor the same as the set temperature, humidity and wind speed of the constant temperature and humidity airflow.

[0042] This invention uses fluid simulation calculations to evenly distribute the constant temperature and humidity air output from the air conditioning unit to each spinning unit; for example... Figure 1 As shown, a precise PID closed-loop control algorithm for parameters such as temperature, humidity, and flow rate is used to maintain stable environmental temperature and humidity in each spinning unit. Figure 7 As shown: "Process hot return air" is air recycled from the workshop (providing heat to reduce energy consumption). "Sharing a single probe" refers to using a temperature and humidity sensor for the overall workshop environment. The workshop return air passes through a primary fresh air filter in the enclosure to remove dust and lint. A portion is directly reused as a balancing airflow by adjusting the proportion through a secondary return air valve, while the other portion is mixed with fresh air through a fresh air valve and enters the refrigeration unit. The compressor controls the dew point (dehumidification and cooling) to achieve the required temperature and humidity. This air is then mixed with the secondary return air and delivered to each spinning unit. Under the monitoring of the delivery sensor, PID closed-loop regulation is performed to achieve constant temperature and humidity in the spinning unit. Its core principle is to convert analog control into digital control, resulting in more precise control. The PID controller automatically adjusts the temperature, humidity, and airflow equipment based on the difference between the set target value and the sensor value to achieve automatic control of temperature, humidity, and airflow.

[0043] As described above, in a spinning method based on a spinning microenvironment system, the circumference of a variable cross-section air supply duct is connected to the top of the unit rectifier hood on each spinning unit via flexible hoses, thereby delivering constant temperature and humidity airflow into the rectifier hood body. A throttling valve is provided at the connection between the flexible hose and the circumference of the variable cross-section air supply duct to regulate the airflow rate delivered to the unit rectifier hood. Theoretically, V inside the variable cross-section air supply duct is set to a constant value, but in reality, the airflow velocity from the airflow input end to the output end of the variable cross-section air supply duct still differs due to pipe losses. By setting a throttling valve to reduce the cross-section, the flow rate is reduced (reducing the flow rate of the branch pipe with a large flow rate), ensuring that the flow rate of all hoses is consistent.

[0044] As described above, in a spinning method based on a spinning microenvironment system, when the cross-section of the variable cross-section air supply duct is circular or square, the slope K of the variable cross-section air supply duct is K = r1*(n 1 / 2 -1) / L*(n-1); r1 is the radius or side length of the cross-section of the output end of the variable cross-section air supply duct; L is the distance between the central axes of two adjacent branch pipes, i.e., the spindle pitch of the spinning unit; n is the number of branch pipes.

[0045] The specific derivation process is as follows:

[0046] K = △r / L*(n-1) (5);

[0047] In the formula: K — slope of the variable cross section;

[0048] △r——△r=r-r1, is the difference between the maximum radius and the minimum radius (mm);

[0049] L—Spindle pitch (mm) of the spinning unit;

[0050] r = r1 * n 1 / 2 ;

[0051] but:

[0052] △r=r-r1= r1*n 1 / 2 - r1 = r1*(n 1 / 2 -1) (6);

[0053] Substituting equation (6) into equation (5), we get:

[0054] K = r1*(n 1 / 2 -1) / L*(n -1) (7);

[0055] According to formula (7), when n is determined, K is also determined;

[0056] When the cross-section of the variable cross-section air supply duct is rectangular, the slope K = b1 / L; b1 is the length or width that decreases uniformly in the cross-section of the output end of the variable cross-section air supply duct; L is the distance between the central axes of two adjacent branch pipes, i.e., the spindle pitch of the spinning unit; n is the number of branch pipes, i.e., the number of spinning units.

[0057] The specific derivation process is as follows:

[0058] S = a * b (8);

[0059] S1 = a * b1 (9);

[0060] Where: a——width of the variable cross-section air supply duct (mm);

[0061] b—Height of the inlet end of the variable cross-section air supply duct (mm);

[0062] b1—Height of the output end of the variable cross-section air supply duct (mm);

[0063] (The above derivation process can also be used to keep the height constant while changing the width);

[0064] S = n * S1 = n * a * b1 (10);

[0065] K =( b- b1) / L*n=( n* b1- b1) / L*(n-1)= b1 *( n-1) / L*(n-1)= b1 / L (11);

[0066] According to formula (11), when n is determined, K is also determined.

[0067] As described above, a spinning method based on a spinning microenvironment system can transform a constant cross-section air supply duct into a variable cross-section air supply duct. Specifically, an inclined plate is placed in the constant cross-section air supply duct, the slope of the inclined plate to the horizontal plane is K, the length of the inclined plate in the horizontal direction is the same as the length of the constant cross-section air supply duct, and the width of the inclined plate is the same as the width of the constant cross-section air supply duct. The structure formed by the lower surface of the inclined plate and the constant cross-section air supply duct is the variable cross-section air supply duct.

[0068] The following embodiments of the present invention illustrate only the technical solution of one air conditioning unit supplying one device; Figure 6 This diagram illustrates a technical solution for supplying air to multiple devices using a central air conditioning unit. The main air supply duct represents the total flow rate of a single unit. To ensure a balance in the flow rate of a single unit at the front and rear ends of the main air supply duct, the main air supply duct can support a maximum of 10 single units. Alternatively, a ring-shaped main air supply duct can be constructed, which would limit the number of single units.

[0069] Beneficial effects:

[0070] (1) The present invention provides a spinning method based on a spinning microenvironment system. By precisely controlling the temperature, humidity, flow rate and flow of the microenvironment of each spinning unit, the temperature and humidity of each spinning unit are consistent, ensuring the stability of the spinning unit's operation. The control of the macroenvironment and the "point-to-point" control of the microenvironment result in significant energy saving and consumption reduction, with the system saving more than 80% of energy.

[0071] (2) The present invention provides a spinning method based on a spinning microenvironment system. The microenvironment temperature and humidity of the drafting zone of the spinning unit are stable, which prevents the drafting components from getting tangled and improves the service life of the drafting equipment and the spinning efficiency. At the same time, it prevents external fly hair and dust from entering the drafting zone and improves the yarn quality.

[0072] (3) A spinning method based on a spinning microenvironment system of the present invention. Compared with the traditional method, the device reduces energy consumption per ton of yarn and material consumption per ton of yarn, improves yarn quality and production efficiency, and significantly improves the overall benefits of spinning.

[0073] (4) The present invention provides a spinning method based on a spinning microenvironment system, wherein the microenvironment of the drafting zone of the spinning unit is not affected by the external environment, and the workshop can be replenished with a large amount of fresh air, which greatly improves the working environment. Attached Figure Description

[0074] Figure 1 A schematic diagram of the implementation of a single vortex spinning microenvironment;

[0075] Figure 2 This is a frontal view of the mid-section of a vehicle body in the prior art.

[0076] Figure 3 This is a side view of the middle section of the vehicle body of the present invention;

[0077] Figure 4 This is an axle side view of the mid-section of the vehicle body of the present invention;

[0078] Figure 5 for Figure 3 A magnified view of a portion of the middle fairing;

[0079] Figure 6 Implementation plan for the microenvironment of multi-machine vortex spinning;

[0080] Figure 7 This is a schematic diagram illustrating the principle of fluid simulation technology.

[0081] Among them, 1-air conditioning unit, 2-variable cross-section air supply duct, 3-unit rectifier, 4-system control box, 5-hose, 6-variable cross-section dividing inclined plate, 7-drafting zone, 8-jet vortex spinning machine, 9-rectifier body, 10-guide plate. Detailed Implementation

[0082] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0083] In the embodiments and comparative examples of this invention, for indicators such as yarn evenness, number of knots per kilometer, single yarn breaking strength, single yarn strength coefficient of variation, and yarn defects per 100,000 meters, when the fiber is cotton fiber, the standard for yarn performance testing is "Air-jet vortex spun viscose pure yarn and polyester-viscose blended natural yarn" FZ / T 12039-2013; when the fiber is cellulose fiber or polyester fiber, the standard for yarn performance testing is "Air-jet vortex spun polyester-cotton blended natural yarn" FZ / T 12068-2021.

[0084] Example 1

[0085] A spinning method based on a spinning microenvironment system employs vortex spinning technology, with the process flow being fiber → opening → carding → drawing → vortex spinning → yarn.

[0086] like Figures 3-4 As shown, during the spinning process, the constant temperature and humidity airflow generated by the air conditioning unit is delivered to each spinning unit of the jet vortex spinning machine 8 through the variable cross-section air supply duct 2. The air conditioning unit is electrically connected to a system control box. The airflow and velocity of the constant temperature and humidity airflow delivered to each spinning unit are equal, and the airflow rate Q1 is 7.5 m³ / s. 3 / h, airflow velocity 2m / s;

[0087] The variable cross-section air supply duct 2 is obtained by setting the variable cross-section dividing inclined plate 6 on the constant cross-section air supply duct; the inner wall of the variable cross-section air supply duct 2 is equipped with a heat insulation layer, and a temperature and humidity sensor and a wind speed sensor are installed inside the variable cross-section air supply duct 2; the temperature and humidity sensor and the wind speed sensor are electrically connected to the system control box respectively. When the measured values ​​of the temperature and humidity sensor and the wind speed sensor deviate from the set temperature, humidity and wind speed of the constant temperature and humidity airflow, the system control box controls the air conditioning unit so that the measured values ​​of the temperature and humidity sensor and the wind speed sensor are the same as the set temperature, humidity and wind speed of the constant temperature and humidity airflow respectively.

[0088] Each spinning unit is equipped with a unit shroud 3, which consists of a shroud body and a guide plate. The guide plate is a perforated plate with uniformly distributed through holes along its thickness direction. The diameter of the through holes on the guide plate is 3mm, and the proportion of through holes is 35%. The shroud body surrounds the drafting area of ​​the spinning unit except for the bottom. The guide plate is installed inside the shroud body and covers the upper part of the drafting area 7 of the spinning unit. Figure 5 As shown, Figure 3 Enlarged view of a portion of the middle unit hood 3, showing the function of each component: The main body hood 9 concentrates and guides the airflow to the stretching component, while also preventing external fly shavings and dust from entering the stretching zone 7; the guide plate 10 evenly guides the airflow to the stretching zone 7, avoiding the impact of concentrated airflow on the stretching of the sliver.

[0089] The circumference of the variable cross-section air supply duct 2 is connected to the top of the unit rectifier 3 on each spinning unit via flexible hoses 5; a throttling valve is provided at the connection between the flexible hose 5 and the circumference of the variable cross-section air supply duct 2 to regulate the air flow rate delivered to the unit rectifier 3; all flexible hoses 5 have the same cross-sectional area, which is equal to the cross-sectional area of ​​the output end of the variable cross-section air supply duct 2; all flexible hoses 5 are evenly distributed along the length of the variable cross-section air supply duct, with the spacing being the spindle pitch L of the spinning unit = 470mm; the diameter of the flexible hose 5 is 100mm.

[0090] The cross-section of the variable cross-section air supply duct 2 is circular. The cross-sectional area of ​​the variable cross-section air supply duct 2 decreases uniformly from the airflow inlet end to the outlet end, and the rate of change of the cross-sectional radius is (1 / n). 1 / 2 Where n is the number of spinning units; the slope K of the variable cross-section air supply duct 2 is K = r1*(n 1 / 2 -1) / L*(n-1); r1 is the radius of the cross-section of the output end of the variable cross-section air supply duct; L is the distance between the central axes of two adjacent hoses, i.e. the spindle pitch of the spinning unit. The number of hoses 5 is equal to the number of spinning units, both being 120.

[0091] During the spinning process, the temperature and humidity in each spinning unit were set to 26±2℃ and 52±2.5%, respectively; the fiber was cotton fiber, the yarn linear density was 14.8tex, the yarn linear uniformity was 15%, the number of knots per kilometer (+200%) was 56 / km, the single yarn breaking strength was 19.5cN / tex, the single yarn strength variation coefficient was 8.5%, and the number of defects per 100,000 meters of yarn was 5 / 100km.

[0092] like Figure 1As shown, the function of air conditioning unit 1 is to generate the required temperature and humidity air for the equipment, and the output flow rate and pressure meet the microenvironmental requirements of all spinning units. The variable cross-section air supply duct 2 delivers the temperature and humidity air generated by air conditioning unit 1 to each spinning unit. The variable cross-section air supply duct 2 has an insulation layer to ensure that the delivered air is not affected by the external environment. The variable cross-section delivery duct ensures that the airflow at the head and tail ends of the multi-spindle spinning units is basically uniform, and a throttling valve is added to the outlet of each spindle to more precisely adjust the airflow of each spinning unit. The unit rectifier 3 is located within the equipment... The drawing zone forms a microenvironment (temperature: 26℃±2℃, humidity: 52±2.5%), ensuring stable temperature and humidity in the drawing zone. At the same time, because constant temperature and humidity air is introduced into the rectifier shroud, a slight positive pressure is formed on the outside, preventing external flying dust and particles from entering the drawing zone. The system control box 4 monitors the temperature, humidity and flow rate in the duct through temperature and humidity sensors and speed sensors installed in the variable cross-section air supply duct 2. It adopts a PID control algorithm to calculate the control output signal based on the deviation between the current collected temperature, humidity and flow rate and the set values, and controls the working status of the air conditioning unit 1.

[0093] Example 2

[0094] A spinning method based on a spinning microenvironment system employs vortex spinning technology, with the process flow being fiber → opening → carding → drawing → vortex spinning → yarn.

[0095] During the spinning process, constant temperature and humidity airflow generated by the air conditioning unit is delivered to each spinning unit through variable cross-section air supply ducts. The air conditioning unit is electrically connected to a system control box. The airflow rate and velocity of the constant temperature and humidity airflow delivered to each spinning unit are equal, and the airflow rate Q1 is 7.5 m³ / s. 3 / h, airflow velocity 2m / s;

[0096] The inner wall of the variable cross-section air supply duct is equipped with a heat insulation layer. The variable cross-section air supply duct is equipped with a temperature and humidity sensor and a wind speed sensor. The temperature and humidity sensor and the wind speed sensor are electrically connected to the system control box. When the measured values ​​of the temperature and humidity sensor and the wind speed sensor deviate from the set temperature, humidity and wind speed of the constant temperature and humidity airflow, the system control box controls the air conditioning unit to make the measured values ​​of the temperature and humidity sensor and the wind speed sensor the same as the set temperature, humidity and wind speed of the constant temperature and humidity airflow.

[0097] Each spinning unit is equipped with a unit hood, which consists of a hood body and a guide plate. The guide plate is a perforated plate with uniform through holes along the thickness direction. The diameter of the through holes on the guide plate is 3mm, and the proportion of through holes is 35%. The hood body surrounds the drafting area of ​​the spinning unit except for the bottom. The guide plate is installed inside the hood body and covers the upper part of the drafting area of ​​the spinning unit.

[0098] The circumference of the variable cross-section air supply duct is connected to the top of the unit rectifier on each spinning unit via flexible hoses; a throttling valve is installed at the connection between the flexible hose and the circumference of the variable cross-section air supply duct to regulate the airflow delivered to the unit rectifier; all hoses have the same cross-sectional area, which is equal to the cross-sectional area of ​​the output end of the variable cross-section air supply duct; all hoses are evenly distributed along the length of the variable cross-section air supply duct, with the spacing being the spindle pitch L = 470 mm of the spinning unit; the diameter of the hose is 100 mm.

[0099] The cross-section of the variable cross-section air supply duct is circular. The cross-sectional area of ​​the variable cross-section air supply duct decreases uniformly from the airflow inlet to the outlet, and the rate of change of the cross-sectional radius is (1 / n). 1 / 2 Where n is the number of spinning units; the slope K of the variable cross-section air supply duct is K = r1*(n 1 / 2 -1) / L*(n-1); r1 is the radius of the cross-section of the output end of the variable cross-section air supply duct; L is the distance between the central axes of two adjacent hoses, i.e. the spindle pitch of the spinning unit. The number of hoses is equal to the number of spinning units, both being 120.

[0100] During the spinning process, the temperature and humidity in each spinning unit were set to 28℃±2℃ and 55%±2.5%, respectively; the fiber was cellulose fiber, the yarn linear density was 14.8tex, the yarn linear uniformity was 14.5%, the number of knots per kilometer (+200%) was 46 / km, the single yarn breaking strength was 11.5cN / tex, the single yarn strength variation coefficient was 9%, and the number of defects per 100,000 meters of yarn was 11 / 100km.

[0101] Example 3

[0102] A spinning method based on a spinning microenvironment system employs vortex spinning technology, with the process flow being fiber → opening → carding → drawing → vortex spinning → yarn.

[0103] During the spinning process, constant temperature and humidity airflow generated by the air conditioning unit is delivered to each spinning unit through variable cross-section air supply ducts. The air conditioning unit is electrically connected to a system control box. The airflow rate and velocity of the constant temperature and humidity airflow delivered to each spinning unit are equal, and the airflow rate Q1 is 7.5 m³ / s. 3 / h, airflow velocity 2m / s;

[0104] The inner wall of the variable cross-section air supply duct is equipped with a heat insulation layer. The variable cross-section air supply duct is equipped with a temperature and humidity sensor and a wind speed sensor. The temperature and humidity sensor and the wind speed sensor are electrically connected to the system control box. When the measured values ​​of the temperature and humidity sensor and the wind speed sensor deviate from the set temperature, humidity and wind speed of the constant temperature and humidity airflow, the system control box controls the air conditioning unit to make the measured values ​​of the temperature and humidity sensor and the wind speed sensor the same as the set temperature, humidity and wind speed of the constant temperature and humidity airflow.

[0105] Each spinning unit is equipped with a unit hood, which consists of a hood body and a guide plate. The guide plate is a perforated plate with uniform through holes along the thickness direction. The diameter of the through holes on the guide plate is 3mm, and the proportion of through holes is 35%. The hood body surrounds the drafting area of ​​the spinning unit except for the bottom. The guide plate is installed inside the hood body and covers the upper part of the drafting area of ​​the spinning unit.

[0106] The circumference of the variable cross-section air supply duct is connected to the top of the unit rectifier on each spinning unit via flexible hoses; a throttling valve is installed at the connection between the flexible hose and the circumference of the variable cross-section air supply duct to regulate the airflow delivered to the unit rectifier; all hoses have the same cross-sectional area, which is equal to the cross-sectional area of ​​the output end of the variable cross-section air supply duct; all hoses are evenly distributed along the length of the variable cross-section air supply duct, with the spacing being the spindle pitch L = 470 mm of the spinning unit; the diameter of the hose is 100 mm.

[0107] The cross-section of the variable cross-section air supply duct is square. The cross-sectional area of ​​the variable cross-section air supply duct decreases uniformly from the airflow inlet to the outlet, and the rate of change of the side length of the cross-section is (1 / n). 1 / 2 Where n is the number of spinning units; the slope K of the variable cross-section air supply duct is K = r1*(n 1 / 2 -1) / L*(n-1); r1 is the side length of the cross-section of the output end of the variable cross-section air supply duct; L is the distance between the central axes of two adjacent hoses, i.e. the spindle pitch of the spinning unit. The number of hoses is equal to the number of spinning units, both being 120.

[0108] During the spinning process, the temperature and humidity in each spinning unit were set to 26±2℃ and 52±2.5%, respectively; the fiber was cotton fiber, the yarn linear density was 14.8tex, the yarn linear uniformity was 15%, the number of knots per kilometer (+200%) was 56 / km, the single yarn breaking strength was 20cN / tex, the single yarn strength variation coefficient was 9%, and the number of defects per 100,000 meters of yarn was 8 / 100km.

[0109] Example 4

[0110] A spinning method based on a spinning microenvironment system employs vortex spinning technology, with the process flow being fiber → opening → carding → drawing → vortex spinning → yarn.

[0111] During the spinning process, constant temperature and humidity airflow generated by the air conditioning unit is delivered to each spinning unit through variable cross-section air supply ducts. The air conditioning unit is electrically connected to a system control box. The airflow rate and velocity of the constant temperature and humidity airflow delivered to each spinning unit are equal, and the airflow rate Q1 is 7.5 m³ / s. 3 / h, airflow velocity 2m / s;

[0112] The inner wall of the variable cross-section air supply duct is equipped with a heat insulation layer. The variable cross-section air supply duct is equipped with a temperature and humidity sensor and a wind speed sensor. The temperature and humidity sensor and the wind speed sensor are electrically connected to the system control box. When the measured values ​​of the temperature and humidity sensor and the wind speed sensor deviate from the set temperature, humidity and wind speed of the constant temperature and humidity airflow, the system control box controls the air conditioning unit to make the measured values ​​of the temperature and humidity sensor and the wind speed sensor the same as the set temperature, humidity and wind speed of the constant temperature and humidity airflow.

[0113] Each spinning unit is equipped with a unit hood, which consists of a hood body and a guide plate. The guide plate is a perforated plate with uniform through holes along the thickness direction. The diameter of the through holes on the guide plate is 3mm, and the proportion of through holes is 35%. The hood body surrounds the drafting area of ​​the spinning unit except for the bottom. The guide plate is installed inside the hood body and covers the upper part of the drafting area of ​​the spinning unit.

[0114] The circumference of the variable cross-section air supply duct is connected to the top of the unit rectifier on each spinning unit via flexible hoses; a throttling valve is installed at the connection between the flexible hose and the circumference of the variable cross-section air supply duct to regulate the airflow delivered to the unit rectifier; all hoses have the same cross-sectional area, which is equal to the cross-sectional area of ​​the output end of the variable cross-section air supply duct; all hoses are evenly distributed along the length of the variable cross-section air supply duct, with the spacing being the spindle pitch L = 470 mm of the spinning unit; the diameter of the hose is 100 mm.

[0115] The cross-section of the variable cross-section air supply duct is square. The cross-sectional area of ​​the variable cross-section air supply duct decreases uniformly from the airflow inlet to the outlet, and the rate of change of the side length of the cross-section is (1 / n). 1 / 2 Where n is the number of spinning units; the slope K of the variable cross-section air supply duct is K = r1*(n 1 / 2 -1) / L*(n-1); r1 is the side length of the cross-section of the output end of the variable cross-section air supply duct; L is the distance between the central axes of two adjacent hoses, i.e. the spindle pitch of the spinning unit. The number of hoses is equal to the number of spinning units, both being 120.

[0116] During the spinning process, the temperature and humidity in each spinning unit were set to 28±2℃ and 58±2.5%, respectively; the fiber was polyester fiber, the yarn linear density was 14.8tex, the yarn linear uniformity was 14%, the number of knots per kilometer (+200%) was 25 / km, the single yarn breaking strength was 26cN / tex, the single yarn strength variation coefficient was 9.5%, and the number of defects per 100,000 meters of yarn was 12 / 100km.

[0117] Example 5

[0118] A spinning method based on a spinning microenvironment system employs vortex spinning technology, with the process flow being fiber → opening → carding → drawing → vortex spinning → yarn.

[0119] During the spinning process, constant temperature and humidity airflow generated by the air conditioning unit is delivered to each spinning unit through variable cross-section air supply ducts. The air conditioning unit is electrically connected to a system control box. The airflow rate and velocity of the constant temperature and humidity airflow delivered to each spinning unit are equal, and the airflow rate Q1 is 7.5 m³ / s. 3 / h, airflow velocity 2m / s;

[0120] The inner wall of the variable cross-section air supply duct is equipped with a heat insulation layer. The variable cross-section air supply duct is equipped with a temperature and humidity sensor and a wind speed sensor. The temperature and humidity sensor and the wind speed sensor are electrically connected to the system control box. When the measured values ​​of the temperature and humidity sensor and the wind speed sensor deviate from the set temperature, humidity and wind speed of the constant temperature and humidity airflow, the system control box controls the air conditioning unit to make the measured values ​​of the temperature and humidity sensor and the wind speed sensor the same as the set temperature, humidity and wind speed of the constant temperature and humidity airflow.

[0121] Each spinning unit is equipped with a unit hood, which consists of a hood body and a guide plate. The guide plate is a perforated plate with uniform through holes along the thickness direction. The diameter of the through holes on the guide plate is 3mm, and the proportion of through holes is 35%. The hood body surrounds the drafting area of ​​the spinning unit except for the bottom. The guide plate is installed inside the hood body and covers the upper part of the drafting area of ​​the spinning unit.

[0122] The circumference of the variable cross-section air supply duct is connected to the top of the unit rectifier on each spinning unit via flexible hoses; a throttling valve is installed at the connection between the flexible hose and the circumference of the variable cross-section air supply duct to regulate the airflow delivered to the unit rectifier; all hoses have the same cross-sectional area, which is equal to the cross-sectional area of ​​the output end of the variable cross-section air supply duct; all hoses are evenly distributed along the length of the variable cross-section air supply duct, with the spacing being the spindle pitch L = 470 mm of the spinning unit; the diameter of the hose is 100 mm.

[0123] The cross-section of the variable cross-section air supply duct is rectangular. The length of the cross-section of the variable cross-section air supply duct decreases uniformly from the airflow inlet to the outlet, and the rate of change of this uniformly decreasing length is 1 / n, where n is the number of spinning units, 120. The slope of the variable cross-section air supply duct is K = b1 / L, where b1 is the uniformly decreasing length in the cross-section of the output end of the variable cross-section air supply duct, and L is the distance between the central axes of two adjacent hoses, i.e., the spindle pitch of the spinning unit. The number of hoses is equal to the number of spinning units, both being 120.

[0124] During the spinning process, the temperature and humidity in each spinning unit were set to 28℃±2℃ and 55%±2.5%, respectively; the fiber was cellulose fiber, the yarn linear density was 14.8tex, the yarn linear uniformity was 14.07%, the number of knots per kilometer (+200%) was 20 / km, the single yarn breaking strength was 12.9cN / tex, the single yarn strength variation coefficient was 9.5%, and the number of defects per 100,000 meters of yarn was 2.7 / 100km.

[0125] Taking viscose fiber (cellulose fiber) with a yarn linear density of 14.8 tex as an example, with a controlled temperature of 28℃±2℃ and humidity of 55%±2.5%, the yarn quality compared to a normal environment (temperature 32~36℃, humidity 65%~75%) is shown in the table below:

[0126]

[0127] Example 6

[0128] A spinning method based on a spinning microenvironment system employs vortex spinning technology, with the process flow being fiber → opening → carding → drawing → vortex spinning → yarn.

[0129] During the spinning process, constant temperature and humidity airflow generated by the air conditioning unit is delivered to each spinning unit through variable cross-section air supply ducts. The air conditioning unit is electrically connected to a system control box. The airflow rate and velocity of the constant temperature and humidity airflow delivered to each spinning unit are equal, and the airflow rate Q1 is 7.5 m³ / s. 3 / h, airflow velocity 2m / s;

[0130] The inner wall of the variable cross-section air supply duct is equipped with a heat insulation layer. The variable cross-section air supply duct is equipped with a temperature and humidity sensor and a wind speed sensor. The temperature and humidity sensor and the wind speed sensor are electrically connected to the system control box. When the measured values ​​of the temperature and humidity sensor and the wind speed sensor deviate from the set temperature, humidity and wind speed of the constant temperature and humidity airflow, the system control box controls the air conditioning unit to make the measured values ​​of the temperature and humidity sensor and the wind speed sensor the same as the set temperature, humidity and wind speed of the constant temperature and humidity airflow.

[0131] Each spinning unit is equipped with a unit hood, which consists of a hood body and a guide plate. The guide plate is a perforated plate with uniform through holes along the thickness direction. The diameter of the through holes on the guide plate is 3mm, and the proportion of through holes is 35%. The hood body surrounds the drafting area of ​​the spinning unit except for the bottom. The guide plate is installed inside the hood body and covers the upper part of the drafting area of ​​the spinning unit.

[0132] The circumference of the variable cross-section air supply duct is connected to the top of the unit rectifier on each spinning unit via flexible hoses; a throttling valve is installed at the connection between the flexible hose and the circumference of the variable cross-section air supply duct to regulate the airflow delivered to the unit rectifier; all hoses have the same cross-sectional area, which is equal to the cross-sectional area of ​​the output end of the variable cross-section air supply duct; all hoses are evenly distributed along the length of the variable cross-section air supply duct, with the spacing being the spindle pitch L = 470 mm of the spinning unit; the diameter of the hose is 100 mm.

[0133] The cross-section of the variable cross-section air supply duct is rectangular. The width of the cross-section of the variable cross-section air supply duct decreases uniformly from the airflow inlet to the outlet, and the rate of change of this uniformly decreasing width is 1 / n, where n is the number of spinning units. The slope of the variable cross-section air supply duct is K = b1 / L, where b1 is the uniformly decreasing width in the cross-section of the outlet end of the variable cross-section air supply duct, and L is the distance between the central axes of two adjacent hoses, i.e., the spindle pitch of the spinning unit. The number of hoses is equal to the number of spinning units, both being 120.

[0134] During the spinning process, the temperature and humidity in each spinning unit were set to 28±2℃ and 58±2.5%, respectively; the fiber was polyester fiber, the yarn linear density was 14.8tex, the yarn linear uniformity was 13.8%, the number of knots per kilometer (+200%) was 28 / km, the single yarn breaking strength was 27cN / tex, the single yarn strength variation coefficient was 9.5%, and the number of defects per 100,000 meters of yarn was 12 / 100km.

Claims

1. A spinning method based on a spinning microenvironment system, characterized in that: During the spinning process, constant temperature and humidity airflow is delivered to each spinning unit through a variable cross-section air supply duct. The airflow rate and velocity delivered to each spinning unit are equal. Each spinning unit is independently connected to the variable cross-section air supply duct through a branch pipe. The cross-sectional area of ​​all branch pipes is equal and equal to the cross-sectional area of ​​the output end of the variable cross-section air supply duct. All branch pipes are evenly distributed along the length of the variable cross-section air supply duct, and the spacing is equal to the spindle pitch L of the spinning unit. The cross section of the variable cross-section air supply pipeline is circular or square, the cross-sectional area of the variable cross-section air supply pipeline uniformly decreases from the air flow input end to the output end, and the gradient rate of the cross-sectional radius or side length is (1 / n) 1 / 2 wherein n is the number of spinning units; Alternatively, the cross-section of the variable cross-section air supply duct is rectangular. The length or width of the cross-section of the variable cross-section air supply duct decreases uniformly from the airflow inlet to the outlet, and the rate of change of the uniformly decreasing length or width is 1 / n, where n is the number of spinning units. Each spinning unit is equipped with a unit hood, which consists of a hood body and a guide plate. The guide plate is a perforated plate with uniform through holes along the thickness direction. The hood body surrounds the area of ​​the drafting zone of the spinning unit except for the bottom. The guide plate is installed inside the hood body and covers the upper part of the drafting zone of the spinning unit. During the spinning process, the temperature fluctuation range in each spinning unit is ±2℃ of the set value, and the humidity fluctuation range is ±2.5% of the set value.

2. The spinning method based on a spinning microenvironment system according to claim 1, characterized in that, The inner wall of the variable cross-section air supply duct is equipped with a heat insulation layer.

3. The spinning method based on a spinning microenvironment system according to claim 2, characterized in that, All branch pipes are flexible hoses with a diameter of 100 mm or more.

4. A spinning method based on a spinning microenvironment system according to claim 3, characterized in that, The diameter of the through holes on the guide plate is 2-3 mm, and the proportion of through holes is 30-35%.

5. A spinning method based on a spinning microenvironment system according to claim 4, characterized in that, The vortex spinning process is adopted, and the process flow is fiber → opening → carding → drawing → vortex spinning → yarn.

6. A spinning method based on a spinning microenvironment system according to claim 5, characterized in that, The air flow rate in each spinning unit is 7-8 m³ / h. 3 / h, airflow velocity less than or equal to 2m / s.

7. A spinning method based on a spinning microenvironment system according to claim 6, characterized in that, When the fiber is cotton and the yarn linear density is 14.8 tex, the temperature and humidity in each spinning unit during the spinning process are set to 26±2℃ and 52±2.5%, respectively. The yarn linear uniformity is ≤15.5%, the number of knots per kilometer (+200%) is ≤60 / km, the single yarn breaking strength is ≥19cN / tex, the single yarn strength variation coefficient is ≤9%, and the number of yarn defects per 100,000 meters is ≤5 / 100km. When the fiber is cellulose fiber and the yarn linear density is 14.8 tex, the temperature and humidity in each spinning unit during the spinning process are set to 28℃±2℃ and 55%±2.5%, respectively. The yarn linear uniformity is ≤15%, the number of knots per kilometer (+200%) is ≤50 / km, the single yarn breaking strength is ≥10.5cN / tex, the single yarn strength variation coefficient is ≤10%, and the number of yarn defects per 100,000 meters is ≤15 / 100km. When the fiber is polyester fiber and the yarn linear density is 14.8tex, the temperature and humidity in each spinning unit during the spinning process are set to 28±2℃ and 58±2.5%, respectively. The yarn linear uniformity is ≤15%, the number of knots per kilometer (+200%) is ≤30 / km, the single yarn breaking strength is ≥22cN / tex, the single yarn strength variation coefficient is ≤10.5%, and the number of yarn defects per 100,000 meters is ≤15 / 100km.

8. A spinning method based on a spinning microenvironment system according to claim 7, characterized in that, The constant temperature and humidity airflow is generated by the air conditioning unit and delivered to the variable cross-section air supply duct; the air conditioner is electrically connected to a system control box, which is used to control the temperature, humidity and wind speed of the constant temperature and humidity airflow generated by the air conditioner.

9. A spinning method based on a spinning microenvironment system according to claim 8, characterized in that, The variable cross-section air supply duct is equipped with a temperature and humidity sensor and a wind speed sensor. The temperature and humidity sensor and the wind speed sensor are electrically connected to the system control box. When the measured values ​​of the temperature and humidity sensor and the wind speed sensor deviate from the set temperature, humidity and wind speed of the constant temperature and humidity airflow, the system control box controls the air conditioning unit to make the measured values ​​of the temperature and humidity sensor and the wind speed sensor the same as the set temperature, humidity and wind speed of the constant temperature and humidity airflow.

10. A spinning method based on a spinning microenvironment system according to claim 9, characterized in that, The circumference of the variable cross-section air supply duct is connected to the top of the unit rectifier on each spinning unit via flexible hoses; a throttling valve is provided at the connection between the flexible hose and the circumference of the variable cross-section air supply duct to regulate the air flow rate delivered to the unit rectifier.

11. A spinning method based on a spinning microenvironment system according to claim 1, characterized in that, When the cross-section of the variable cross-section air supply duct is circular or square, the slope K of the variable cross-section air supply duct is K = r1*(n 1 / 2 -1) / L*(n-1); r1 is the radius or side length of the cross-section of the output end of the variable cross-section air supply duct, and n is the number of branch pipes; When the cross-section of the variable cross-section air supply duct is rectangular, the slope K = b1 / L; b1 is the length or width of the cross-section of the variable cross-section air supply duct that decreases uniformly at the output end, and n is the number of branch pipes.

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