A method for closed-loop control of cone winding based on prediction of package diameter

Abstract

The application discloses a bobbin winding closed-loop control method based on package diameter prediction and relates to the technical field of yarn winding production.The method comprises the following steps: establishing a bobbin model, predicting the diameter of the bobbin, and determining the predicted diameter of the bobbin according to the total length of the yarn and the real-time length of the yarn; the prediction of the diameter of the bobbin has an influence on the winding speed of the yarn in real time; the winding speed of the yarn influences the tension of the yarn, and further changes the rotating speed of the overfeed motor; the total length of the yarn is adjusted appropriately according to the change of the rotating speed of the overfeed motor, thereby changing the progress of the bobbin winding, and closed-loop control of the predicted diameter of the bobbin without sensing is realized.The application optimizes the bobbin diameter detection scheme of the winder, effectively reduces the parameter adjustment time before the winder is used, improves the detection precision of the bobbin diameter, improves the production efficiency, and reduces the production cost.

Description

Technical Field

[0001] This invention relates to the field of yarn winding production technology, and specifically to a closed-loop control method for bobbin winding based on package diameter prediction. Background Technology

[0002] In the process of researching and practicing this method, the inventors of this invention discovered that in the textile industry, the performance of yarn largely determines the appearance quality of fabric. To improve the weak points of the yarn and increase its average strength, the winding machine winds the raw yarn into edged or edgeless bobbins with a large volume and appropriate package shape to meet the needs of high-speed production of the warping machine. Moreover, the yarn winding process can effectively enhance yarn performance and is a key process combining the spinning and weaving processes in the textile workflow. The excellent yarn produced by this process has the characteristics of uniform winding density, no knots, few yarn defects, and less hairiness, which can improve production efficiency and finished product quality in actual production.

[0003] During the winding process, the diameter of the yarn bobbin gradually increases due to the overlapping of yarns. Assuming that the tension and the angular velocity of the winding motor remain constant, the winding speed will also gradually increase with the running time. This results in the outer yarn winding being more tightly wound than the inner yarn winding, leading to the formation of a chrysanthemum core or a convex edge bobbin. Therefore, the control method used in traditional textile yarn winding systems is generally to directly measure the diameter of the yarn bobbin to calculate the winding speed.

[0004] Due to hardware limitations, this type of method measures the diameter of the yarn package by direct contact with the yarn during the measurement process. The friction generated at the contact point can easily affect the quality of the yarn and may also affect the running state of the yarn package during the contact process, thus affecting production quality and efficiency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a closed-loop control method for bobbin winding based on bobbin diameter prediction. This method can optimize the bobbin diameter detection scheme of winding machines, effectively improve the detection accuracy of bobbin diameter in the absence of sensors, improve production efficiency, and reduce production costs.

[0006] In a first aspect, the present invention provides a closed-loop control method for bobbin winding based on bobbin diameter prediction, comprising the following steps:

[0007] Step 1: Preparation stage before winding.

[0008] Set the diameter of the empty cylinder Full cylinder diameter Total yarn length The initial values, yarn tension setting range, and take-up speed setting values. The yarn is passed sequentially through the overfeed mechanism, tension sensor, first yarn guide ring, and dynamic yarn guide mechanism, and then wound onto the yarn core of the winding mechanism.

[0009] Step 2: Initial winding stage.

[0010] The overfeed mechanism provides tension to the yarn through the rotation of the overfeed wheel; the winding mechanism drives the yarn core to rotate, and the dynamic yarn guide mechanism drives the yarn to reciprocate along the axis of the yarn core, so that the yarn is wound around the yarn core. The rotational angular velocity of the yarn core... ;in, Predicted diameter of yarn cone. The initial value is the diameter of the empty spindle cylinder, and it is dynamically updated during the winding stabilization phase.

[0011] After the overfeed wheel starts rotating, the tension sensor continuously monitors the yarn tension; the average angular velocity of the overfeed wheel within a preset time T0 after the yarn tension stabilizes within the set yarn tension range is taken as the target angular velocity of the overfeed wheel. .

[0012] Step 3: Winding stabilization stage.

[0013] The angular velocity of the overfeed wheel is dynamically adjusted according to changes in yarn tension, ensuring the yarn tension remains stable within the set range. The rotational angular velocity of the yarn core is updated and adjusted at regular intervals. The winding process continues until the winding progress P reaches 100%, at which point the winding is complete.

[0014] Update and adjust the rotational angular velocity of the yarn core. The specific process is as follows:

[0015] 3-1. Calculate the average angular velocity of the overfeed wheel in the previous update cycle. ;like > This increases the total length of the yarn. ;like < This reduces the total yarn length. .

[0016] 3-2. Integrate the winding speed over time to obtain the real-time yarn length. The winding progress P is calculated as follows:

[0017] .

[0018] 3-3. Based on the type of yarn being wound, update the predicted diameter D of the yarn using one of the following two methods:

[0019] Method 1: The type of yarn being wound is a yarn without selvage; the expression for the predicted diameter D of the yarn is as follows:

[0020]

[0021] in, The diameter of the full cylinder; The diameter is the empty cylinder.

[0022] Method 2: The type of yarn being wound is a finishing yarn; the expression for the predicted diameter D of the yarn is as follows:

[0023]

[0024] in, The full diameter of the cylinder. The diameter of the empty cylinder. The length of the yarn package. , These are the finishing lengths at both ends of the wound yarn cone; , These are the minimum diameters of the finishing areas at both ends of the wound yarn cone.

[0025] 3-4. Update the rotational angular velocity of the yarn core. .

[0026] Preferably, in step two, when the overfeed wheel starts to rotate, it rotates at a uniform acceleration; 0.1 to 0.5 seconds after the overfeed wheel starts to rotate, the winding mechanism starts to drive the yarn core to rotate.

[0027] Preferably, the preset duration T0 mentioned in step two is 30s.

[0028] Preferably, the duration of the update cycle T in step three is 10 seconds.

[0029] Secondly, the present invention provides a yarn winding device for performing the aforementioned closed-loop control method for yarn winding.

[0030] The yarn winding device includes an overfeed mechanism, a first yarn guide ring, a tension sensor, and a dynamic yarn guiding mechanism. The winding mechanism, mounted on the top of the frame, includes a winding motor and a winding shaft. The winding motor is fixed inside the frame. The output shaft of the winding motor faces upwards and is coaxially fixed with the vertical winding shaft. The winding shaft is used to mount the yarn core. The dynamic yarn guiding mechanism includes a second yarn guide ring and a lifting drive assembly. The second yarn guide ring is driven to move up and down by the lifting drive assembly.

[0031] The overfeed mechanism and tension sensor are both mounted on the side of the frame. The overfeed mechanism includes an overfeed wheel, a winding rod, and an overfeed motor. The overfeed wheel and winding rod, which are horizontally aligned and arranged side by side, are both supported on the outside of the frame. The overfeed wheel is driven to rotate by the overfeed motor mounted inside the frame.

[0032] During the winding process, the yarn is wound around the overfeed wheel and the winding rod. The yarn that winds out from the overfeed wheel and the winding rod is guided by the first guide ring, then passes through the tension sensor, and the yarn that passes through the tension sensor passes through the second guide ring and is wound onto the yarn core on the winding mechanism.

[0033] Preferably, the lifting drive assembly includes a synchronous pulley, a synchronous belt, and a yarn guide motor. The two synchronous pulleys, arranged vertically, are both supported on the frame and connected by the synchronous belt. The yarn guide motor is fixed to the frame, and its output shaft is fixed to one of the synchronous pulleys. The second yarn guide ring is fixed to the synchronous belt.

[0034] Preferably, the second yarn guide ring forms a sliding pair with the vertical guide rail fixed on the frame via a slider.

[0035] Preferably, the yarn winding device further includes a fixed yarn guide mechanism. The fixed yarn guide mechanism is mounted on the side of the frame. The fixed yarn guide mechanism is provided with a yarn guide groove. During the winding process, the yarn first passes through the yarn guide groove on the fixed yarn guide mechanism, and then winds around the overfeed wheel and the winding rod.

[0036] As can be seen from the above technical solution, the beneficial effects of the present invention are as follows:

[0037] 1. This invention determines the diameter of the yarn package by predicting the winding progress of the yarn package model and calculates and controls the winding speed in real time to tend to a relatively constant range. It has high precision in tension control during high-speed precision winding, resulting in uniform yarn package winding density, no yarn breaks, no knots, fewer yarn defects, and less fuzz.

[0038] 2. The detection method used in this invention optimizes the detection scheme of yarn bobbin diameter for winding machines compared with traditional detection methods. By eliminating the contact-type diameter measuring device, the damage to the yarn caused by friction is eliminated, the influence of the diameter measuring sensor on the yarn bobbin formation is reduced, and the purpose of high-quality yarn bobbin winding is achieved.

[0039] 3. This invention achieves dynamic prediction and updating of the real-time diameter of the yarn package without using sensors, and continuously updates the total yarn length, resulting in a yarn package shape with extremely high consistency. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the bobbin winding device used in this invention;

[0041] Figure 2A flowchart of the closed-loop control method for yarn winding provided by the present invention;

[0042] Figure 3 This is a control signal flow diagram of the yarn winding device used in this invention;

[0043] Figure 4 This is a schematic diagram of the yarn bobbin model without edge finishing in this invention;

[0044] Figure 5 This is a schematic diagram of the edge-gathering yarn model in this invention. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] like Figure 1 As shown, a closed-loop control method for yarn winding based on package diameter prediction is used, which employs a yarn winding device including a circuit control board (not shown in the figure), a fixed yarn guiding mechanism 1, an overfeed mechanism 2, a first yarn guiding ring 4, a tension sensor 5, a dynamic yarn guiding mechanism 8, a frame 11, a winding mechanism 12, and a yarn core 13.

[0047] The frame 11 adopts a box structure, with through holes and threaded holes on its sides and top for mounting other mechanisms. The winding mechanism 12 is mounted on top of the frame 11 and includes a winding motor 10 and a winding shaft 14. The winding motor 10 is fixed inside the frame 11. The output shaft of the winding motor 10 faces upwards and is coaxially fixed with the vertical winding shaft 14. The winding shaft 14 is used to house and fix the yarn core 13.

[0048] The dynamic yarn guiding mechanism 8 includes a second yarn guiding ring 7 and a lifting drive assembly. Driven by the lifting drive assembly, the second yarn guiding ring 7 moves up and down; during yarn winding, the second yarn guiding ring 7 reciprocates in the vertical direction, thereby guiding the yarn to be evenly wound onto the yarn core 13. The lifting drive assembly includes a synchronous pulley, a synchronous belt, and a yarn guiding motor 6. The two synchronous pulleys, arranged vertically, are both supported on the frame 11 and connected by the synchronous belt. The yarn guiding motor 6 is fixed to the frame 11, and its output shaft is fixed to one of the synchronous pulleys.

[0049] The fixed yarn guide mechanism 1, the overfeed mechanism 2, and the tension sensor 5 are mounted on the side of the frame 11. The overfeed mechanism 2 includes an overfeed wheel, a winding rod 3, and an overfeed motor 9. The overfeed wheel and the winding rod 3, which are horizontally aligned and arranged side by side, are both supported on the outside of the frame 11. The overfeed wheel is driven to rotate by the overfeed motor 9, which is mounted inside the frame 11.

[0050] During operation, the yarn passes through the fixed yarn guide mechanism 1 and then enters the overfeed mechanism 2, where it winds around the overfeed wheel and winding rod 3. The yarn winding from the overfeed wheel and winding rod 3 is guided by the first yarn guide ring 4, then passes through the tension sensor 5. The yarn exiting the tension sensor 5 passes through the dynamic yarn guide mechanism 8 and is wound onto the yarn core 13 on the winding mechanism 12. The fixed yarn guide mechanism 1 stabilizes the yarn and reduces its sway. The overfeed mechanism 2 feeds the yarn and adjusts its tension. The tension sensor 5 detects the yarn tension in real time and transmits the read tension signal to the MCU controller.

[0051] like Figure 2 and 3 As shown, the method for predicting the winding diameter of yarn bobbins based on overfeed speed closed-loop control includes the following steps:

[0052] Step 1: Winding Start-up Stage.

[0053] 1-1. The diameter of the empty cylinder was measured before startup. (i.e., the diameter of the yarn core), and set the required full bobbin diameter according to different yarn types. Total yarn length The values ​​of yarn tension setting and winding speed v.

[0054] 1-2. After receiving the start signal, the MCU controller outputs the corresponding instructions to the drive circuit board, which then sequentially starts the yarn guide motor 6, the overfeed motor 9, and the winding motor 10.

[0055] 1-3. After the yarn guide motor 6 starts, it rotates alternately in both directions, driving the second yarn guide ring 7 to reciprocate at a constant speed in the vertical direction.

[0056] 1-4. The overfeed motor 9 drives the overfeed wheel to rotate at a uniform acceleration. After a delay of 0.1 to 0.5 seconds, the winding motor 10 starts to rotate until its angular velocity reaches the preset working angular velocity. To prevent excessive tension fluctuations in the yarn, the acceleration at the edge of the overfeed wheel is in the range of 2 to 8 m / s². 2 The overfeed motor acceleration time is set to 10-15 seconds.

[0057] 1-5. The winding motor 10 starts slightly after the overfeed motor 9. In this embodiment, the delay time is 0.1 to 0.5 seconds. During the acceleration of the overfeed wheel, the winding speed... Maintain dynamic tracking of the overfeed pulley speed to keep yarn tension stable within a preset range centered on the set value. Take-up speed. The linear velocity of the yarn wound on the yarn core 13 under the drive of the winding motor.

[0058] During the rotation of the winding motor 10 and the overfeed motor 9, the target angular velocity of the winding motor 10 is calculated based on the winding wire speed. Its expression is: ;in, For winding speed, This is the current predicted diameter of the yarn package. The predicted diameter D is calculated based on either the non-edge yarn package model or the edge yarn package model, depending on the type of yarn package being wound.

[0059] Based on the target angular velocity and the current actual angular velocity of the winding motor 10 The input signal of the winding motor 10 is dynamically adjusted.

[0060] 1-6. Tension sensor 5 detects yarn tension, and the average angular velocity of the overfeed wheel within 30 seconds after the yarn tension stabilizes is taken as the target angular velocity of the overfeed wheel. In this process, since the diameter of the empty spindle is known, the predicted diameter of the yarn package at the current progress during the initial startup phase is... With a diameter almost equal to that of the empty cylinder, the average overfeed wheel angular velocity during this period represents the most precise angular velocity to ensure a constant winding tension at the desired winding speed. Therefore, the average overfeed wheel angular velocity during this stage is set as the target angular velocity. This allows for self-learning calculation, analysis, and adjustment of the winding progress in subsequent processes.

[0061] Step 2: Stable operation phase.

[0062] 2-1. With the linear velocity of the yarn bobbin remaining relatively constant and fluctuating within an acceptable range, the angular velocity of the overfeed wheel is dynamically calculated and adjusted based on changes in yarn tension to keep the yarn tension constant near the set yarn tension value. Specifically, when the yarn tension exceeds the preset yarn tension value, the target angular velocity... Increase; when the yarn tension is less than the set yarn tension value, the target angular velocity... Decrease.

[0063] 2-2. The angular velocity of the overfeed wheel every 10 seconds Mean and target angular velocity Compare; if the overfeed wheel angular velocity Target angular velocity This increases the total length of the yarn. If the wheel angular velocity is overfed <Target angular velocity This reduces the total yarn length. Total yarn length The increment and decrement are both preset length values. Preset length value It is determined in advance by human intervention or through experimentation based on the needs of control.

[0064] 2-3. Calculate the real-time yarn length by integrating the winding speed over time. And based on the real-time length of the yarn Calculate winding progress Winding progress The expression is .in, and These are the real-time yarn length and total yarn length, respectively. Based on the established model, the winding progress... The calculated yarn diameter at this progress point, i.e., the predicted yarn diameter, forms a closed loop.

[0065] 2-4. Based on the winding progress Whether the winding progress reaches 100% is used as the criterion for determining whether the winding is complete; if the winding is complete, the winding ends; if the winding is not yet complete, repeat steps 2-1 to 2-3 until the winding progress P reaches 100%.

[0066] Combination Figure 2 Explain the design strategy.

[0067] Set the target tension and total yarn length settings, set the overfeed wheel diameter and adjustment coefficient, input them into the prediction model, and select different prediction models according to requirements.

[0068] The high-speed winding machine runs at the initial set value for a period of time. The real-time tension value detected by the tension sensor 5 will change due to the increase in the diameter of the yarn package. The real-time tension value will affect the angular velocity of the overfeed motor 9. The change in the angular velocity of the overfeed motor 9 and the total yarn length set value will determine the total yarn length.

[0069] The ratio of real-time length to total yarn length represents the winding progress. Based on the established bobbin model, the bobbin diameter at this progress can be predicted. The predicted bobbin diameter and the real-time angular velocity of the winding motor 12 determine the real-time yarn length (i.e., the real-time linear velocity of the yarn winding is obtained from the predicted bobbin diameter and the real-time angular velocity, and then the real-time linear velocity is integrated over time to obtain the real-time yarn length). The predicted bobbin diameter affects the yarn winding speed, which in turn affects the yarn tension, thus changing the angular velocity of the overfeed motor 9. Here, the total yarn length is adjusted appropriately based on the change in the angular velocity of the overfeed motor 9, thereby changing the winding progress and achieving closed-loop control of the predicted bobbin diameter.

[0070] Next, combine Figure 3 The winding machine platform is described.

[0071] The yarn passes through the first guide ring 4, the overfeed roller, the tension sensor 5, and the dynamic yarn guiding mechanism 8 from the raw yarn to the take-up roller. In the adjustment section, the yarn is wound on the overfeed roller, and the yarn tension is adjusted by changing the difference in linear velocity between the overfeed roller and the spindle by controlling the overfeed motor 9. The angular velocity of the spindle is determined by set parameters, and to ensure that the yarn is wound evenly on the spindle, the yarn take-up speed needs to be kept constant. The angular velocity of the overfeed roller is determined by the feedback value of the tension sensor 5, which is installed between the overfeed roller and the dynamic yarn guiding mechanism 8 to detect the yarn tension in real time. It changes the angular velocity of the overfeed roller based on the difference between the feedback value and the set target tension. Since the linear velocity of the spindle winding the yarn is constant, changing the angular velocity of the overfeed roller can change the yarn tension, forming a closed loop of yarn tension control.

[0072] The following combination Figure 4 The model for predicting the diameter D of a bobbin without selvage is explained below:

[0073] Figure 4 middle, The diameter of the empty cylinder. Predict the diameter of the yarn package. The full diameter of the cylinder. This refers to the length of the yarn package.

[0074] Winding progress Based on the real-time length of the yarn and the set total yarn length The decision is expressed as follows:

[0075] Equation (1)

[0076] In the no-seam yarn model, the yarn cone shape is a hollow cylinder, and its yarn volume when fully filled is... The expression is as follows:

[0077] Equation (2)

[0078] In this embodiment, it is assumed that the density of the yarn package is uniform, that is, the volume of the currently wound yarn. Volume of full-bore yarn The ratio of the current quality of the yarn rolls received. With the quality of full-bore yarn The ratio is equal to the winding progress. (i.e., the real-time length of the yarn and the total length of the yarn), see equation (3).

[0079] Equation (3)

[0080] The shape of the unsewn yarn remains a hollow cylinder throughout the winding process. The current volume of the wound yarn is:

[0081] Equation (4)

[0082] From the above equations (1), (2), (3), and (4), the predicted diameter of the yarn package can be obtained. for:

[0083] Equation (5)

[0084] The following combination Figure 5 The model for predicting the diameter D of the yarn package is described.

[0085] like Figure 5 As shown, the shape of the edge-sealing bobbin is an irregular body of revolution, in which, The full diameter of the cylinder. The diameter of the empty cylinder. The length of the yarn package. This refers to the length of the top edge of the yarn package. This refers to the length of the lower edge of the yarn package. The minimum diameter of the upper edge finishing area of ​​the yarn package. The minimum diameter of the lower edge finishing area of ​​the yarn package. For winding progress, and These represent the volumes missing at the top and bottom edges after treating the yarn cone as a cylinder. The volume when the cone is full. as follows:

[0086] Equation (6)

[0087] right and Establish coordinate systems respectively, where for:

[0088] Equation (7)

[0089] According to the two-point formula: (( ,0),( , ))

[0090] Equation (8)

[0091] From equations (7) and (8), we can obtain:

[0092] Equation (9)

[0093] Integrating with respect to x, we get:

[0094] (10)

[0095] Simplifying, we get:

[0096] (11)

[0097] Similarly for:

[0098] (12)

[0099] Similarly to equation (3), we can obtain:

[0100] (13)

[0101] The edge-finishing model uses a hollow cylinder of equal volume with a diameter of [missing information]. Combining equations (4), (6), (10), (11), and (12), we can obtain:

[0102] (14)

[0103] Simplifying, we get:

[0104] (15)

[0105] It should be noted that the information interaction and execution process between the various units in the above-mentioned device and system are based on the same concept as the method embodiment of the present invention, and the specific details can be found in the description in the method embodiment of the present invention, and will not be repeated here.

[0106] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, which may include: read-only memory (ROM), random access memory (RAM), disk or optical disk, etc.

[0107] The above provides a detailed description of a method for predicting the winding diameter of yarn bobbins based on overfeed speed closed-loop control, as provided in the embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A closed-loop control method for bobbin winding based on package diameter prediction, characterized in that: Includes the following steps: Step 1: Preparation stage before winding; Set the diameter of the empty cylinder Full cylinder diameter Total yarn length The initial values, yarn tension setting range, and take-up speed setting values. The yarn is passed through the overfeed mechanism (2), tension sensor (5), first yarn guide ring (4), and dynamic yarn guide mechanism (8) in sequence, and wound onto the yarn core (13) of the winding mechanism (12); Step 2: Initial stage of winding; The overfeed mechanism (2) provides tension to the yarn through the rotation of the overfeed wheel; the winding mechanism (12) drives the yarn core (13) to rotate, and the dynamic yarn guiding mechanism (8) drives the yarn to move back and forth along the axis of the yarn core (13), so that the yarn is wound on the yarn core (13); the rotational angular velocity of the yarn core (13) is... ;in, Predicted diameter of yarn cone; Predicted diameter of yarn cone The initial value is the diameter of the empty spindle cylinder, and it is dynamically updated during the winding stabilization phase; After the overfeed wheel starts to rotate, the tension sensor (5) continuously detects the tension of the yarn; the average angular velocity of the overfeed wheel within a preset time T0 after the yarn tension stabilizes within the set yarn tension range is taken as the target angular velocity of the overfeed wheel. ; Step 3: Winding stabilization stage; The angular velocity of the overfeed wheel is dynamically adjusted according to the change in yarn tension, so that the yarn tension is stabilized within the set yarn tension range; every update cycle, the rotational angular velocity of the adjusting yarn core (13) is updated. The winding process continues until the winding progress P reaches 100%, at which point the winding is complete. Update the rotational angular velocity of the adjusting yarn core (13) The specific process is as follows: 3-1. Calculate the average angular velocity of the overfeed wheel in the previous update cycle. ;like > This increases the total length of the yarn. ;like < This reduces the total yarn length. ; 3-2. Integrate the winding speed over time to obtain the real-time yarn length. The winding progress P is calculated as follows: ； 3-3. Based on the type of yarn being wound, update the predicted diameter D of the yarn using one of the following two methods: Method 1: The type of yarn being wound is a yarn without selvage; the expression for the predicted diameter D of the yarn is as follows: in, The diameter of the full cylinder; The diameter of the empty cylinder; Method 2: The type of yarn being wound is a finishing yarn; the expression for the predicted diameter D of the yarn is as follows: in, The diameter of the full cylinder. The diameter of the empty cylinder. The length of the yarn package. , These are the finishing lengths at both ends of the wound yarn cone; , These are the minimum diameters of the finishing areas at both ends of the wound yarn cone; 3-4. Update the rotational angular velocity of the yarn core (13). .

2. The closed-loop control method for bobbin winding based on package diameter prediction according to claim 1, characterized in that: In step two, when the overfeed wheel starts to rotate, it rotates at a uniform acceleration; 0.1 to 0.5 seconds after the overfeed wheel starts to rotate, the winding mechanism (12) starts to drive the yarn core (13) to rotate.

3. The closed-loop control method for bobbin winding based on package diameter prediction according to claim 1, characterized in that: The preset duration T0 mentioned in step two is 30s.

4. The closed-loop control method for bobbin winding based on package diameter prediction according to claim 1, characterized in that: The duration of the update cycle T mentioned in step three is 10 seconds.

5. A yarn winding device, characterized in that: Used to perform the closed-loop control method for yarn winding as described in any one of claims 1-4; The yarn winding device includes an overfeed mechanism (2), a first yarn guide ring (4), a tension sensor (5), and a dynamic yarn guide mechanism (8); the winding mechanism (12) is installed on the top of the frame (11) and includes a winding motor (10) and a winding shaft (14); the winding motor (10) is fixed inside the frame (11); the output shaft of the winding motor (10) is set upward and is coaxially fixed with the vertical winding shaft (14); the winding shaft (14) is used to install the yarn core (13); the dynamic yarn guide mechanism (8) includes a second yarn guide ring (7) and a lifting drive assembly; the second yarn guide ring (7) is driven by the lifting drive assembly to perform lifting and lowering movements; The overfeed mechanism (2) and tension sensor (5) are both installed on the side of the frame (11); the overfeed mechanism (2) includes an overfeed wheel, a winding rod (3) and an overfeed motor (9); the overfeed wheel and the winding rod (3) are horizontally aligned and arranged side by side and are supported on the outside of the frame (11); the overfeed wheel is driven to rotate by the overfeed motor (9) installed in the frame (11); During the winding process, the yarn is wound on the overfeed wheel and the winding rod (3); the yarn wound from the overfeed wheel and the winding rod (3) is guided by the first guide ring (4) and then passes through the tension sensor (5). The yarn passing through the tension sensor (5) passes through the second guide ring (7) and is then wound onto the yarn core (13) on the winding mechanism (12).

6. A yarn winding device according to claim 5, characterized in that: The lifting drive assembly includes a synchronous wheel, a synchronous belt, and a yarn guide motor (6); the two synchronous wheels arranged vertically are both supported on the frame (11) and connected by the synchronous belt; the yarn guide motor (6) is fixed on the frame (11), and its output shaft is fixed to one of the synchronous wheels; the second yarn guide ring (7) is fixed to the synchronous belt.

7. A yarn winding device according to claim 5, characterized in that: The second yarn guide ring (7) forms a sliding pair with the vertical guide rail fixed on the frame through a slider.

8. A yarn winding device according to claim 5, characterized in that: The yarn winding device also includes a fixed yarn guide mechanism (1); the fixed yarn guide mechanism (1) is installed on the side of the frame (11); the fixed yarn guide mechanism (1) is provided with a yarn guide groove; during the winding process, the yarn first passes through the yarn guide groove on the fixed yarn guide mechanism (1) and then winds around the overfeed wheel and the winding rod (3).

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