Low-shrinkage PBT fiber high-speed spinning control system

Abstract

The invention relates to the technical field of spinning control, and discloses a low-shrinkage PBT (polybutylene terephthalate) fiber high-speed spinning control system, which comprises a stretching module, the control system further comprises a thermal imaging acquisition module, an image acquisition module and an analysis module, and thermal imaging information data of the nascent filaments are acquired through the thermal imaging acquisition module; acquiring image information data of the nascent filaments through an image acquisition module; and finally, analyzing the image information data of the nascent filaments through an analysis module to obtain control parameters of the heating roller. The heating roller heats the nascent filaments according to the control parameters, thermal imaging information data of the nascent filaments are analyzed, and a first judgment index used for judging whether the stretching roller can conduct stretching or not is obtained; judging whether stretching can be performed or not according to the first judgment index; therefore, the alpha crystal phase and the beta crystal phase reach a preset proportion after the primary filament is stretched; therefore, the stability of fiber quality is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of spinning control, and particularly to a high-speed spinning control system for low-shrinkage PBT fibers. Background Art

[0002] In the production process of low-shrinkage PBT (polybutylene terephthalate) fibers, through specific process control, the PBT fibers have a low shrinkage rate when heated or wetted; this low-shrinkage property is particularly important in textile applications such as electronic component packaging materials, automotive parts, and precision instruments that require precise dimensional control.

[0003] In the prior art, the spinning process of low-shrinkage PBT fibers is a complex and delicate process, mainly including pretreatment, melting, extrusion, cooling, stretching, winding, and detection; first, the PBT material is pretreated before spinning to remove impurities and adjust the material properties; then the pretreated PBT material is sent into a melting device for melting; subsequently, the melted PBT material is extruded through the nozzle of the spinning mechanism and cooled and solidified into a nascent filament, which mainly belongs to the α crystal phase. The α crystal phase is a stable crystalline form of PBT, having good tensile deformation performance and elastic recovery ability of deformation; subsequently, the nascent filament is stretched by a stretching module, which includes two stretching rollers and a heating roller. During the stretching process, the heating roller contacts the nascent filament and performs rolling heating, and then the nascent filament is stretched by the two stretching rollers. The PBT molecular chains are oriented and rearranged, and part of the α crystal phase is transformed into the β crystal phase. During the stretching process, it is necessary to strictly control the stretching speed, stretching ratio of the two stretching rollers, and the temperature of the fiber during stretching to make the α crystal phase and the β crystal phase reach a preset ratio to obtain low-shrinkage PBT fibers, and then wind them into a reel through a winding device for subsequent processing; and then regularly detect indicators such as the strength and boiling water shrinkage rate of the fibers to ensure that the quality of the fibers meets the standards.

[0004] However, the above technology still has relatively large defects. For example, in the above technology, the β crystal phase is an unstable crystalline form of PBT. Therefore, during the stretching process, the heating roller is usually in parallel contact with the nascent filament to heat the nascent filament as a whole. If the temperature of the heating roller surface is uneven, it will cause the temperature of the nascent filament to be uneven, and it is difficult for the heating roller to heat the local part of the nascent filament. And if the temperature of the nascent filament is uneven, the ratio of the α crystal phase and the β crystal phase may change, and the fiber properties may decline. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-speed spinning control system for low-shrinkage PBT fibers to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] The high-speed spinning control system for low-shrinkage PBT fibers includes a stretching module: the stretching module includes two stretching rollers and a heating roller; the control system further includes:

[0008] A thermal imaging acquisition module for acquiring thermal imaging information data of the nascent fiber;

[0009] An image acquisition module for acquiring image information data of the nascent fiber;

[0010] An analysis module, which obtains the control parameters of the heating roller by analyzing the image information data of the nascent fiber; obtains a first judgment index for judging whether the stretching roller can perform stretching by analyzing the thermal imaging information data of the nascent fiber; and judges whether stretching can be performed according to the first judgment index.

[0011] As a further solution of the present invention: the analysis process of the analysis module includes the following steps:

[0012] S1: The image acquisition module acquires the first image information data of the nascent fiber in the unstretched state;

[0013] S2: By moving the two stretching rollers to the initial positions, both ends of the nascent fiber are fixedly arranged between the two stretching rollers;

[0014] S3: The image acquisition module acquires the second image information data of the nascent fiber fixedly arranged between the two stretching rollers;

[0015] S4: Judge whether the nascent fiber fixed between the two stretching rollers is in the unstretched state according to the first image information data and the second image information data; if it is in the unstretched state, go to step S5; if it is in the stretched state, repeat step S2;

[0016] S5: The thermal imaging acquisition module acquires the thermal imaging information data of the nascent fiber, and the analysis module extracts the features of the nascent fiber in the thermal imaging information data;

[0017] S6: Divide the thermal imaging information data of the nascent fiber extracted with features into several monitoring units according to the extension direction of the nascent fiber;

[0018] S7: By analyzing the thermal imaging information data of the nascent fiber in each monitoring unit, obtain a first judgment index for judging whether stretching can be performed. If stretching cannot be performed, obtain the control parameters of the heating roller in each monitoring unit according to the thermal imaging information data of the nascent fiber in each monitoring unit; the heating roller heats the nascent fiber in each monitoring unit according to the control parameters, and after heating is completed, return to step S5; if stretching can be performed, the two stretching rollers stretch the nascent fiber.

[0019] As a further solution of the present invention: the thermal imaging information data includes temperature; the control parameter includes the rolling speed of the heating roller.

[0020] As a further solution of the present invention: by the formula:

[0021] Calculate the rolling speed v of the k-th monitoring unit k ;

[0022] Where, T k Is the temperature value of the nascent filament of the k-th monitoring unit; T 0 Is the preset stretching temperature of the nascent filament; C 1 Is the first preset constant; v 0 Is the basic rolling speed; v 1 Is the maximum rolling speed; v 1 ≥v 0 .

[0023] As a further solution of the present invention: by the formula:

[0024] Calculating the first judgment index includes:

[0025] Where, W 0 Is the preset allowable error value; W 1 Is the preset allowable maximum difference; T H Is the maximum temperature value of the nascent filament among all monitoring units; T L Is the minimum temperature value of the nascent filament among all monitoring units.

[0026] As a further solution of the present invention: in step S7, the process of judging whether stretching can be performed according to the first judgment index is;

[0027] When P 1 = 1, the nascent filament can be stretched;

[0028] When P 1 = 0, the nascent filament cannot be stretched.

[0029] As a further solution of the present invention: the judgment process of whether the fiber meets the stretching initial state is:

[0030] S10: Extract the features of the nascent filament in the first image information data and the second image information data and magnify them to a preset multiple of the actual size of the nascent filament;

[0031] S20: Randomly intercept multiple unit lengths of the nascent filament in the magnified first image information data and the second image information data; and obtain the diameter and the number of holes of each unit length of the nascent filament;

[0032] S30. Analyze based on the diameter and number of holes per unit length in the first image information data and the second image information data to obtain the initial state judgment index of the primary filament.

[0033] S40: Judge whether the primary filament is in a stretched state according to the initial state judgment index of the primary filament.

[0034] As a further solution of the present invention: In step S30, through the formula:

[0035] Calculate the initial state judgment index P of the primary filament L ;

[0036] where f(X) is a judgment function. When X > 0, f(X) = 0; when X ≤ 0, f(X) = 1; M is the number of primary filaments with unit length randomly intercepted on the second image information data, m ∈ M; N is the number of primary filaments with unit length randomly intercepted on the second image information data, n ∈ N; d n is the diameter of the nth unit length of the primary filament on the second image information data; d m is the diameter of the mth unit length of the primary filament on the first image information data; Q m is the number of holes of the mth unit length of the primary filament on the first image information data; Q n is the number of holes of the nth unit length of the primary filament on the second image information data.

[0037] As a further solution of the present invention: In step S40, the judgment process of whether the primary filament is in a stretched state is as follows;

[0038] When P L = 1, the primary filament is not in a stretched state;

[0039] When P L = 0, the primary filament is in a stretched state.

[0040] Compared with the prior art, the beneficial effects of the present invention are:

[0041] (1) In the present invention, the heating roller is arranged perpendicular to the extending direction of the nascent filament. Therefore, when the heating roller rolls, it contacts the local part of the nascent filament at the same time. The thermal imaging information data of the nascent filament is collected by the thermal imaging acquisition module; the image information data of the nascent filament is collected by the image acquisition module; finally, the analysis module analyzes the image information data of the nascent filament to obtain the control parameters of the heating roller; the heating roller heats the nascent filament according to the control parameters, and the first judgment index for judging whether the stretching roller can perform stretching is obtained by analyzing the thermal imaging information data of the nascent filament; and it is judged whether stretching can be performed according to the first judgment index; thus ensuring that after the nascent filament is stretched, the α crystal phase and the β crystal phase reach a preset ratio; thus ensuring the stability of the fiber quality.

[0042] (2) In the present invention, the nascent filament in the first image information data and the second image information data is subjected to feature extraction and enlarged to a preset multiple of the actual size of the nascent filament; in the enlarged first image information data and second image information data, multiple unit lengths of the nascent filament are randomly intercepted; and the diameter and the number of holes of each unit length of the nascent filament are obtained; according to the diameter and the number of holes of each unit length of the nascent filament in the first image information data and the second image information data, the initial state judgment index of the nascent filament is obtained; finally, it is judged whether the nascent filament is in a stretched state according to the initial state judgment index of the nascent filament; it is judged whether it is in a stretched state from the diameter of the nascent filament and the number of holes of the nascent filament per unit length, ensuring that the nascent filament is in an unstretched state before preheating. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present invention will be further described below with reference to the accompanying drawings.

[0044] Figure 1 It is a system module framework diagram of an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] In order to make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to specific embodiments.

[0046] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "including" or "comprising" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to represent relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0047] Please refer to Figure 1 As shown, in one embodiment, a high-speed spinning control system for low-shrinkage PBT fibers is provided, including a stretching module: the stretching module includes two stretching rollers and a heating roller;

[0048] The control system further includes:

[0049] A thermal imaging acquisition module for acquiring thermal imaging information data of the nascent filament;

[0050] An image acquisition module for acquiring image information data of the nascent filament;

[0051] An analysis module, by analyzing the image information data of the nascent filament, obtains the control parameters of the heating roller; by analyzing the thermal imaging information data of the nascent filament, obtains a first judgment index for judging whether the stretching roller can perform stretching; and judges whether stretching can be performed according to the first judgment index;

[0052] Through the above technical solutions, in this embodiment, the heating roller is arranged perpendicular to the extension direction of the nascent filament. Therefore, when the heating roller rolls, it contacts the local part of the nascent filament at the same time. The thermal imaging acquisition module acquires the thermal imaging information data of the nascent filament; the image acquisition module acquires the image information data of the nascent filament; finally, the analysis module analyzes the image information data of the nascent filament to obtain the control parameters of the heating roller; the heating roller heats the nascent filament according to the control parameters, analyzes the thermal imaging information data of the nascent filament, obtains a first judgment index for judging whether the stretching roller can perform stretching; and judges whether stretching can be performed according to the first judgment index; thereby ensuring that after the nascent filament is stretched, the α crystal phase and the β crystal phase reach a preset ratio; thereby ensuring the stability of the fiber quality.

[0053] As an implementation manner of the present invention, the thermal imaging information data includes temperature; the control parameters include the rolling speed of the heating roller.

[0054] As an implementation manner of the present invention, the analysis process of the analysis module includes the following steps:

[0055] S1: Collect the first image information data of the nascent filament in the unstretched state through the image acquisition module;

[0056] S2: Move the two stretching rollers to the initial positions, and fixedly arrange both ends of the nascent filament between the two stretching rollers;

[0057] S3: Collect the second image information data of the nascent filament fixedly arranged between the two stretching rollers through the image acquisition module;

[0058] S4: Judge whether the nascent filament fixedly arranged between the two stretching rollers is in the unstretched state according to the first image information data and the second image information data; if it is in the unstretched state, enter step S5; if it is in the stretched state, repeat step S2;

[0059] S5: Collect the thermal imaging information data of the nascent filament through the thermal imaging acquisition module, and extract the characteristics of the nascent filament in the thermal imaging information data through the analysis module;

[0060] S6: Divide the thermal imaging information data of the nascent filament with the characteristics extracted into several monitoring units according to the extension direction of the nascent filament;

[0061] S7: Analyze the thermal imaging information data of the nascent filament in each monitoring unit to obtain a first judgment index for judging whether stretching can be performed. If stretching cannot be performed, obtain the control parameters of the heating roller in each monitoring unit according to the thermal imaging information data of the nascent filament in each monitoring unit; the heating roller heats the nascent filament in each monitoring unit according to the control parameters, and after the heating is completed, return to step S5; if stretching can be performed, the two stretching rollers stretch the nascent filament;

[0062] Through the above technical solution, in this embodiment, the first image information data of the as-spun filament in the unstretched state is collected by the image acquisition module; then, by moving the two stretching rollers to the initial position, both ends of the as-spun filament are fixedly arranged between the two stretching rollers; the second image information data of the as-spun filament fixedly arranged between the two stretching rollers is collected by the image acquisition module; it is judged whether the as-spun filament fixed between the two stretching rollers is in the unstretched state according to the first image information data and the second image information data; if it is in the unstretched state, the thermal imaging information data of the as-spun filament is collected by the thermal imaging acquisition module, and the characteristics of the as-spun filament in the thermal imaging information data are extracted by the analysis module; the thermal imaging information data of the as-spun filament after feature extraction is divided into several monitoring units according to the extension direction of the as-spun filament; by analyzing the thermal imaging information data of the as-spun filament in each monitoring unit, a first judgment index for judging whether stretching can be performed is obtained. If stretching cannot be performed, the control parameters of the heating roller in each monitoring unit are obtained according to the thermal imaging information data of the as-spun filament in each monitoring unit; the heating roller heats the as-spun filament in each monitoring unit according to the control parameters, and after heating is completed, the thermal imaging information data of the as-spun filament is collected again for analysis until it is judged according to the first judgment index that stretching can be performed, and the two stretching rollers stretch the as-spun filament; thereby ensuring that after the as-spun filament is stretched, the α crystal phase and the β crystal phase reach a preset ratio; thus ensuring the stability of the fiber quality.

[0063] As an implementation manner of the present invention, through the formula:

[0064] Calculate the rolling speed v of the k-th monitoring unit k ;

[0065] Wherein, T k is the temperature value of the as-spun filament in the k-th monitoring unit; T 0 is the preset stretching temperature of the as-spun filament; C 1 is the first preset constant; v 0 is the basic rolling speed; v 1 is the maximum rolling speed; v 1 ≥v 0 ;

[0066] Through the above technical solution, in this embodiment, the heating roller is arranged perpendicular to the extension direction of the as-spun filament. Therefore, when the heating roller rolls, it contacts the local part of the as-spun filament at the same time. Therefore, when T k <T 0 , it indicates that the temperature value of the as-spun filament in the k-th monitoring unit has not reached the preset stretching temperature of the as-spun filament and needs to be heated. T k -T 0 is the difference between the temperature value of the as-spun filament in the k-th monitoring unit and the preset stretching temperature of the as-spun filament; since T k -T 0<0, so the difference T between the temperature value of the virgin silk of the k-th monitoring unit and the preset stretching temperature of the virgin silk k -T 0 The larger the absolute value, the slower the rolling speed v of the k-th monitoring unit k The slower the rolling speed, the longer the contact time between the heating roller and the k-th monitoring unit, so that the virgin silk of the k-th monitoring unit quickly reaches the preset stretching temperature of the virgin silk; when T k ≥T 0 It means that the temperature value of the virgin silk of the k-th monitoring unit has reached the preset stretching temperature of the virgin silk and heating is required. The maximum rolling speed v 1 Passes through the virgin silk of the k-th monitoring unit to reduce the contact time between the heating roller and the k-th monitoring unit;

[0067] It should be noted that the preset stretching temperature T of the virgin silk 0 , the first preset constant C 1 , the basic rolling speed v 0 and the maximum rolling speed v 1 Are preset values, obtained based on experience and not elaborated here.

[0068] As an implementation manner of the present invention, through the formula:

[0069] Calculating the first judgment index includes:

[0070] Among them, W 0 Is the preset allowable error value; W 1 Is the preset allowable maximum difference; T H Is the maximum temperature value of the virgin silk among all monitoring units; T L Is the minimum temperature value of the virgin silk among all monitoring units;

[0071] Through the above technical solution, in this embodiment |T k -T 0 | Is the absolute value of the difference between the temperature value of the virgin silk of the k-th monitoring unit and the preset stretching temperature of the virgin silk; |T k -T 0 |-W 0 Is the difference between the absolute value of the difference between the temperature value of the virgin silk of the k-th monitoring unit and the preset stretching temperature of the virgin silk and the preset allowable error value; in the formula f[|T k -T 0 |-W 0 , X in the judgment function f(X) refers to |T k -T 0 |-W 0; used to determine whether the absolute value of the difference between the temperature value of the virgin silk of the k-th monitoring unit and the preset stretching temperature of the virgin silk is less than the preset allowable error value; when |T k -T 0 |-W 0 ≤0, it indicates that the absolute value of the difference between the temperature value of the virgin silk of the k-th monitoring unit and the preset stretching temperature of the virgin silk is less than the preset allowable error value; therefore, the temperature value of the virgin silk of the k-th monitoring unit reaches the preset stretching temperature, so f[|T k -T 0 |-W 0 = 1; when |T k -T 0 |-W 0 >0, it indicates that the absolute value of the difference between the temperature value of the virgin silk of the k-th monitoring unit and the preset stretching temperature of the virgin silk is greater than the preset allowable error value; therefore, the temperature value of the virgin silk of the k-th monitoring unit does not reach the preset stretching temperature, so f[|T k -T 0 |-W 0 = 0; T H -T L is the difference between the maximum temperature value and the minimum temperature value of the virgin silk among all monitoring units, (T H -T L )-W 1 is the difference between the difference between the maximum temperature value and the minimum temperature value of the virgin silk among all monitoring units and the preset allowable maximum difference; in the formula f[(T H -T L )-W 1 , X in the judgment function f(X) refers to (T H -T L )-W 1 ; used to determine whether the difference between the maximum temperature value and the minimum temperature value of the virgin silk among all monitoring units is less than the preset allowable maximum difference; when (T H -T L )-W 1 ≤0, it indicates that the difference between the maximum temperature value and the minimum temperature value of the virgin silk among all monitoring units is less than the preset allowable maximum difference; therefore, the temperature of the virgin silk among all monitoring units is uniform, so f[(T H -T L )-W 1 = 1; when (T H -T L )-W 1 >0, it indicates that the difference between the maximum temperature value and the minimum temperature value of the virgin silk among all monitoring units is greater than the preset allowable maximum difference; therefore, the temperature of the virgin silk among all monitoring units is not uniform, so f[(T H -TL ) - W 1 = 0;

[0072] It should be noted that the preset allowable error value W 0 and the preset allowable maximum difference W 1 are preset values, obtained based on experience and not elaborated here.

[0073] As an implementation manner of the present invention, in step S7, the process of judging whether stretching can be performed according to the first judgment index is as follows;

[0074] When P 1 = 1, the as - spun filament can be stretched;

[0075] When P 1 = 0, the as - spun filament cannot be stretched;

[0076] Through the above - mentioned technical solution, in this embodiment, when P 1 = 1, it indicates that the monitoring units of the as - spun filament all reach the preset stretching temperature and the temperature of each monitoring unit is uniform. Therefore, the as - spun filament can start stretching; when P 1 = 0, it indicates that there is at least one monitoring unit of the as - spun filament that does not reach the preset stretching temperature or the temperature of each monitoring unit is not uniform. Therefore, the as - spun filament cannot be stretched. Only when the temperature of each part of the as - spun filament meets the stretching requirements can stretching be carried out, so as to ensure that after stretching the as - spun filament, the α crystal phase and the β crystal phase reach the preset ratio; thus ensuring the stability of the fiber quality.

[0077] As an implementation manner of the present invention, the process of judging whether the fiber conforms to the initial stretching state is as follows:

[0078] S10: Extract the features of the as - spun filament in the first image information data and the second image information data and magnify them to a preset multiple of the actual size of the as - spun filament;

[0079] S20: Randomly intercept multiple unit - length as - spun filaments in the magnified first image information data and the second image information data; and obtain the diameter and the number of holes of each unit - length as - spun filament;

[0080] S30: Analyze according to the diameter and the number of holes of each unit - length as - spun filament in the first image information data and the second image information data to obtain the initial state judgment index of the as - spun filament;

[0081] S40: Judge whether the as - spun filament is in the stretching state according to the initial state judgment index of the as - spun filament;

[0082] Through the above technical solution, in this embodiment, the nascent filaments in the first image information data and the second image information data are subjected to feature extraction and magnified to a preset multiple of the actual size of the nascent filaments; in the magnified first image information data and the second image information data, multiple unit lengths of nascent filaments are randomly intercepted; and the diameter and the number of holes of each unit length of the nascent filaments are obtained; the initial state judgment index of the nascent filaments is obtained through analysis of the diameter and the number of holes of each unit length of the nascent filaments in the first image information data and the second image information data; finally, it is judged whether the nascent filaments are in a stretched state according to the initial state judgment index of the nascent filaments; it is judged whether it is in a stretched state from the diameter of the nascent filaments and the number of holes of the nascent filaments per unit length, so as to ensure that the nascent filaments are in an unstretched state before preheating.

[0083] As an implementation manner of the present invention, in step S30, through the formula:

[0084] Calculate the initial state judgment index P of the nascent filaments L ;

[0085] wherein, f(X) is a judgment function, when X>0, f(X)=0; when X≤0, f(X)=1; M is the number of nascent filaments with unit length randomly intercepted on the second image information data, m∈M; N is the number of nascent filaments with unit length randomly intercepted on the second image information data, n∈N; d n is the diameter of the nth unit length of the nascent filaments on the second image information data; d m is the diameter of the mth unit length of the nascent filaments on the first image information data; Q m is the number of holes of the mth unit length of the nascent filaments on the first image information data; Q n is the number of holes of the nth unit length of the nascent filaments on the second image information data;

[0086] Through the above technical solution, when the nascent filaments are spun in this embodiment, multiple filaments ejected from the nozzle are wound together to form nascent filaments. Therefore, there will be holes between the multiple filaments forming the nascent filaments. After stretching, the number of holes per unit length of the nascent filaments will decrease and the diameter of the nascent filaments will decrease; is the average diameter of the nascent filaments with unit length randomly intercepted on the second image information data, that is, the average diameter of the nascent filaments fixed between the two stretching rollers; is the average diameter of the nascent filaments with unit length randomly intercepted on the first image information data, that is, the average diameter of the nascent filaments in an unstretched state; in the formula the X in the judgment function f(X) refers to is used to judge whether the average diameter of the nascent filaments fixed between the two stretching rollers is less than the average diameter of the nascent filaments in an unstretched state; when When it is, it indicates that the average diameter of the nascent filament fixedly arranged between the two stretching rollers is not less than the average diameter of the nascent filament in the non-stretched state; therefore, the possibility that the nascent filament is in the stretched state is relatively small. Therefore, When it is, it indicates that the average diameter of the nascent filament fixedly arranged between the two stretching rollers is less than the average diameter of the nascent filament in the non-stretched state. Therefore, the possibility that the nascent filament is in the stretched state is relatively large. Therefore, Similarly, is the average number of holes of the nascent filament randomly intercepted per unit length in the second image information data, that is, the average number of holes of the nascent filament per unit length fixedly arranged between the two stretching rollers; is the average number of holes of the nascent filament randomly intercepted per unit length in the first image information data, that is, the average number of holes of the nascent filament in the non-stretched state; in the formula , X in the judgment function f(X) refers to used to judge whether the average number of holes of the nascent filament fixedly arranged between the two stretching rollers is less than the average number of holes of the nascent filament in the non-stretched state; when it is, it indicates that the average number of holes of the nascent filament fixedly arranged between the two stretching rollers is not less than the average number of holes of the nascent filament in the non-stretched state; therefore, the possibility that the nascent filament is in the stretched state is relatively small. Therefore, When it is, it indicates that the average number of holes of the nascent filament fixedly arranged between the two stretching rollers is less than the average number of holes of the nascent filament in the non-stretched state. Therefore, the possibility that the nascent filament is in the stretched state is relatively large. Therefore, Judge whether it is in the stretched state from the diameter of the nascent filament and the number of holes of the nascent filament per unit length through the formula, and ensure that the nascent filament is in the non-stretched state before preheating.

[0087] As an implementation manner of the present invention, in step S40, the judgment process of whether the nascent filament is in the stretched state is as follows;

[0088] When P L =1, the nascent filament is not in the stretched state;

[0089] When P L =0, the nascent filament is in the stretched state;

[0090] Through the above technical solution, in this embodiment, when P L =1, it indicates that the average diameter of the nascent filament has not become smaller, and the number of holes of the nascent filament per unit length has not become smaller either. Therefore, the nascent filament is not in the stretched state; when P LWhen it is 0, it indicates that at least one of the average diameter of the primary filaments becoming smaller and the number of holes in the primary filaments per unit length becoming smaller exists. Therefore, the primary filaments are in a stretched state.

[0091] It should be noted that in this embodiment, the feature extraction of the primary filaments from the first image information data, the first image information data, and the thermal imaging information data is completed by a convolutional neural network model that has been trained. The training process of the convolutional neural network model is prior art and will not be elaborated here.

[0092] As described above, the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application.

Claims

1. A low-shrinkage PBT fiber high-speed spinning control system, comprising a stretching module: the stretching module comprises two stretching rollers and a heating roller; characterized in that: The control system further comprises: Thermal imaging acquisition module, used to collect thermal imaging information data of primary silk; An image acquisition module, used for acquiring image information data of primary silk; The analysis module obtains the control parameters of the heating roller by analyzing the image information data of the spun yarn; obtains the first judgment index for judging whether the stretching roller can perform stretching by analyzing the thermal imaging information data of the spun yarn; and judges whether the stretching can be performed according to the first judgment index.

2. The low shrinkage PBT fiber high-speed spinning control system according to claim 1, characterized in that: The analysis process of the analysis module includes the following steps: S1: collecting first image information data of the raw silk in an unstretched state through an image acquisition module; S2: by moving the two stretching rollers to the initial position, the two ends of the raw silk are fixedly set between the two stretching rollers; S3: collecting second image information data of the spun yarn fixed between the two stretching rollers through an image acquisition module; S4: judging whether the spun yarn fixed between the two stretching rollers is in an unstretched state according to the first image information data and the second image information data; if it is in an unstretched state, proceeding to step S5; if it is in a stretched state, repeating step S2: S5: collecting thermal imaging information data of the raw silk through the thermal imaging acquisition module, and extracting features of the raw silk in the thermal imaging information data through the analysis module; S6: dividing the thermal imaging information data of the primary silk extracted with features into a plurality of monitoring units according to the extension direction of the primary silk; S7: by analyzing the thermal imaging information data of the spun silk of each monitoring unit, a first judgment index for judging whether stretching can be performed is obtained; if stretching cannot be performed, the control parameters of the heating roller in each monitoring unit are obtained according to the thermal imaging information data of the spun silk of each monitoring unit; the heating roller heats the spun silk of each monitoring unit according to the control parameters, and after the heating is completed, the process returns to step S5; if stretching can be performed, the two stretching rollers stretch the spun silk.

3. The low shrinkage PBT fiber high-speed spinning control system according to claim 2, characterized in that: The thermal imaging information data includes temperature; and the control parameter includes a rolling speed of the heating roller.

4. The low shrinkage PBT fiber high-speed spinning control system according to claim 3, characterized in that: By formula: Calculate the scrolling speed v of the kth monitoring unit k ; Among them, T k is the temperature value of the spun yarn of the kth monitoring unit; T0 is the preset stretching temperature of the spun yarn; C1 is the first preset constant; v0 is the basic rolling speed; v1 is the maximum rolling speed; v1≥v0.

5. The low shrinkage PBT fiber high-speed spinning control system according to claim 4, characterized in that: By formula: Calculate the first judgment index include: Where W0 is the preset allowable error value; W1 is the preset maximum allowable difference; T H is the maximum temperature of the primary silk in all monitoring units; T L It is the minimum temperature value of the primary silk in all monitoring units.

6. The low shrinkage PBT fiber high-speed spinning control system according to claim 5, characterized in that: In step S7, the process of judging whether stretching can be performed according to the first judgment index is as follows; When P1 = 1, the spun silk can be stretched; When P1=0, the spun silk cannot be stretched.

7. The low shrinkage PBT fiber high-speed spinning control system according to claim 6, characterized in that: The process of judging whether the fiber meets the initial state of stretching is as follows: S10: extracting features of the raw silk in the first image information data and the second image information data and enlarging the raw silk to a preset multiple of the actual size of the raw silk; S20: randomly intercepting a plurality of primary silks of unit length in the amplified first image information data and the second image information data; and obtaining the diameter and the number of holes of the primary silk of each unit length; S30, analyzing the diameter of the primary silk and the number of holes per unit length in the first image information data and the second image information data to obtain an initial state judgment index of the primary silk; S40: judging whether the spun yarn is in a stretched state according to the initial state judgment index of the spun yarn.

8. The low shrinkage PBT fiber high-speed spinning control system according to claim 7, characterized in that: In step S30, by formula: Calculate the initial state judgment index P of the raw silk L ; Wherein, f(X) is a judgment function, when X>0, f(X)=0; when X≤0, f(X)=1; M is the number of primary silks randomly intercepted per unit length on the second image information data, m∈M; N is the number of primary silks randomly intercepted per unit length on the second image information data, n∈N; d n is the diameter of the nth unit length of the primary silk on the second image information data; d m Q is the diameter of the primary silk of the mth unit length in the first image information data; m Q is the number of holes in the mth unit length of the primary silk in the first image information data; n is the number of holes in the nth unit length of the primary silk in the second image information data.

9. The low shrinkage PBT fiber high-speed spinning control system according to claim 8, characterized in that: In step S40, the process of determining whether the raw silk is in a stretched state is as follows: When P L =1, the spun silk is not in a stretched state; When P L =0, the spun silk is in a stretched state.

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