A jacquard control system based on a circular knitting machine

Abstract

The present invention relates to the technical field of knitting jacquard, and in particular to a jacquard control system based on a circular knitting machine, including a loop-forming mechanism, a yarn feeding mechanism, a data processing mechanism, a monitoring mechanism, a feature analysis module, and a knitting control mechanism. Before the loop-forming mechanism operates, the data processing mechanism determines the initial jacquard programs of the loop-forming mechanism and the yarn feeding mechanism according to the input jacquard preview pattern. The feature analysis module divides the jacquard preview pattern into several knitting sub-regions, and calculates the knitting jacquard characterization parameters according to the jacquard complexity features and the yarn tension characteristic parameters of the yarns in each knitting sub-region, so as to divide the complex difference categories of each knitting sub-region according to the knitting jacquard characterization parameters, and determine the rotation speed of the loop-forming mechanism of a single knitting sub-region according to the complex difference categories, improving the production efficiency of the circular knitting machine.

Description

Technical Field

[0001] The present invention relates to the technical field of knitting jacquard, and particularly to a jacquard control system based on a circular knitting machine. Background Art

[0002] A circular knitting machine, also known as a large circular knitting machine or a circular weft knitting machine, generally consists of a frame, a yarn feeding assembly, a knitting assembly, a transmission assembly, a lubrication and dust removal assembly, an electrical control assembly, a take-up and winding assembly, and other auxiliary devices. Due to its high rotational speed, high output, fast pattern change, good fabric quality, few processes, and strong product adaptability, the circular knitting machine has developed rapidly.

[0003] Chinese Patent Publication No.: CN110106616A, discloses a jacquard circular knitting machine. The equipment body is composed of a large top cover, an outer plate of the large top cover, a main transmission shaft, a large top plate, a middle foot, a secondary transmission shaft, a motor drive device, a motor seat, a seven-character footrest, a lower needle plate, an intermediate knitting needle, a scale, a lower saddle, a lower knitting needle, an upper knitting needle, a yarn feeding nozzle, a spring, an upper needle plate, a middle core pin, a middle core, a bottom ring of the lower saddle, a jacquard sheet, an upper needle plate seat, an upper cutting disc, an inner plate of the large top cover, a sleeve, a selector, a selector seat, a selector base, a large disc gear, and a large disc base. There are many changes in the triangular blocks, and the range of organizational structure adjustment is wide. It can be cut one by one with a knife or the hook knife can be integrated for cutting, and the running track of the knife needle is changed by changing the track of the triangle;

[0004] However, there are still the following problems in the prior art

[0005] For the jacquard of different regions of the same knitted fabric, the jacquard difficulty is different. A unified running speed is adopted for different knitting regions, which affects the production efficiency of the large circular knitting machine. Summary of the Invention

[0006] Therefore, the present invention provides a jacquard control system based on a circular knitting machine to overcome the problem in the prior art that the corresponding running speeds for different knitting regions are not considered, which affects the production efficiency of the large circular knitting machine.

[0007] To achieve the above object, the present invention provides a jacquard control system based on a circular knitting machine, including:

[0008] A looping mechanism for knitting yarn into loops to form a knitted fabric, including knitting needles for hooking the yarn and forming loops;

[0009] A yarn feeding mechanism for feeding the yarn to the looping mechanism;

[0010] A data processing mechanism, which is respectively connected to the yarn feeding mechanism and the looping mechanism, for respectively determining the initial jacquard programs of the yarn feeding mechanism and the looping mechanism based on a jacquard preview diagram, and respectively controlling the yarn feeding mechanism and the looping mechanism to operate according to the initial jacquard programs;

[0011] A monitoring mechanism, which includes a high-speed camera arranged on one side of the looping mechanism for obtaining the image information of the yarn being hooked by the knitting needle;

[0012] A feature analysis module, which is respectively connected to the data processing mechanism and the monitoring mechanism, and is used to obtain the complex jacquard features in each knitted sub-region of the jacquard preview pattern, and calculate the knitted jacquard characterization parameters in combination with the yarn tension characteristic parameters. The complex jacquard features include the chromaticity doping difference amount and the jacquard area ratio;

[0013] A knitting control mechanism, which is respectively connected to the data processing mechanism, the monitoring mechanism and the feature analysis module, and is used to divide the complex difference categories of each knitted sub-region according to the knitted jacquard characterization parameters, and control the looping mechanism according to the complex difference categories, including,

[0014] Determining the rotation speed of the looping mechanism according to the knitted jacquard characterization parameters, obtaining the yarn smoothness based on the hooking image information, so as to determine whether to correct the rotation speed of the looping mechanism according to the jacquard area ratio;

[0015] Or, controlling the looping mechanism to run at a predetermined rotation speed to complete the knitting of the loops.

[0016] Furthermore, the feature analysis module is used to obtain the complex jacquard features in each knitted sub-region of the jacquard preview pattern, including,

[0017] Used to convert the jacquard preview pattern of a single knitted sub-region into a grayscale image;

[0018] Used to respectively frame each grayscale region in the grayscale image;

[0019] Used to calculate the total length of each framed curve as the chromaticity doping difference amount;

[0020] Used to determine the jacquard region in the jacquard preview pattern corresponding to a single knitted sub-region;

[0021] Used to solve the ratio of the total area of each jacquard region in a single knitted sub-region to the area of the knitted sub-region as the jacquard area ratio.

[0022] Furthermore, the feature analysis module is used to obtain the yarn tension characteristic parameters, including,

[0023] Used to obtain the fineness of each yarn, and use the average value of the calculated fineness of each yarn as the yarn tension characteristic parameter.

[0024] Furthermore, the feature analysis module is used to obtain the knitted jacquard characterization parameters, including:

[0025] The ratio of the chromaticity doping difference amount to the average value of the chromaticity doping difference amounts of each historical jacquard preview image is solved to obtain the doping degree characterization quantity;

[0026] The ratio of the jacquard area ratio to the average value of the jacquard area ratios of each historical jacquard preview image is solved to obtain the area ratio characterization quantity;

[0027] The ratio of the average value of each yarn tension characteristic parameter corresponding to each historical jacquard preview image to the yarn tension characteristic parameter is solved to obtain the tension characterization quantity;

[0028] The doping degree characterization quantity, the area ratio characterization quantity, and the tension characterization quantity are respectively assigned corresponding weight coefficients and summed to obtain the knitted jacquard characterization parameter.

[0029] Furthermore, the knitting control mechanism divides the complex difference categories of each knitting sub-region based on the knitted jacquard characterization parameter, including

[0030] If the knitted jacquard characterization parameter is less than or equal to the preset knitted jacquard characterization parameter, a single knitting sub-region is divided into a weak complex difference category;

[0031] If the knitted jacquard characterization parameter is greater than the preset knitted jacquard characterization parameter, a single knitting sub-region is divided into a strong complex difference category.

[0032] Furthermore, the knitting control mechanism controls the loop-forming mechanism to knit the knitting sub-region based on the complex difference category of the single knitting sub-region, including

[0033] If a single knitting sub-region is a weak complex difference category, the loop-forming mechanism is controlled to run at a predetermined speed to complete the knitting of the loops;

[0034] If a single knitting sub-region is a strong complex difference category, the rotation speed of the loop-forming mechanism is determined according to the knitted jacquard characterization parameter, the yarn smoothness is obtained based on the loop-hooking image information, and whether to correct the rotation speed of the loop-forming mechanism according to the jacquard area ratio is determined according to the yarn smoothness.

[0035] Furthermore, the knitting control mechanism determines the rotation speed of the loop-forming mechanism according to the knitted jacquard characterization parameter, where

[0036] The rotation speed of the loop-forming mechanism determined by the knitting control mechanism is inversely proportional to the knitted jacquard characterization parameter.

[0037] Furthermore, the knitting control mechanism obtains the yarn smoothness based on the loop-hooking image information, including

[0038] The yarn characteristics for obtaining the loop-hooking image information, and the yarn characteristics include a curved region of the bent part and a straight region of the straightened part;

[0039] It is used to calculate the ratio of the length corresponding to the curve region to the total length of the yarn features in the loop-drawing image information, which is used as the yarn smoothness.

[0040] Further, the knitting control mechanism determines whether to re-determine the rotational speed of the looping mechanism based on the yarn smoothness, including

[0041] If the yarn smoothness is less than or equal to the preset yarn smoothness, the current rotational speed is continuously used as the operating parameter of the looping mechanism;

[0042] If the yarn smoothness is greater than the preset yarn smoothness, the rotational speed of the looping mechanism is re-determined based on the jacquard area ratio.

[0043] Further, the knitting control mechanism is used to determine the correction amplitude of the rotational speed of the looping mechanism based on the jacquard area ratio, where

[0044] The correction amplitude of the rotational speed of the looping mechanism determined by the knitting control mechanism is positively correlated with the jacquard area ratio.

[0045] Compared with the prior art, the beneficial effects of the present invention are that before the looping mechanism operates, the data processing mechanism will determine the initial jacquard programs of the looping mechanism and the yarn feeding mechanism according to the input jacquard preview pattern. The feature analysis module divides the jacquard preview pattern into several knitting sub-regions, and calculates the knitting jacquard characterization parameters according to the jacquard complexity features and the yarn tension feature parameters of the yarn in each knitting sub-region, so as to divide the complex difference categories of each knitting sub-region according to the knitting jacquard characterization parameters, and determine the rotational speed of the looping mechanism for a single knitting sub-region according to the complex difference categories, while ensuring the accuracy of the jacquard pattern, further improving the production efficiency of the circular knitting machine.

[0046] Further, the present invention calculates the knitting jacquard characterization parameters based on the jacquard complexity features and the yarn tension feature parameters. In actual situations, the jacquard regions of fabrics require more precise control and more complex looping processes. To ensure the accuracy of the jacquard pattern, a lower rotational speed of the circular knitting machine is bound to be required. The more colors there are in the jacquard fabric and the more complex the color doping situation is, it means that the yarn needs to be changed more frequently during the knitting process. To ensure accurate yarn change each time, a lower rotational speed of the circular knitting machine is bound to be required; the thicker the yarn, the greater the tension it can withstand. Coarse yarns require greater force to maintain their shape and structure during processing, especially on high-speed machines. Coarse yarns are not easily broken when stretched, so they can withstand greater tension, while finer yarns require a slower rotational speed of the circular knitting machine to ensure the integrity of the knitted fabric; therefore, the complexity of the jacquard preview pattern and the difficulty of knitting are characterized by the knitting jacquard characterization parameters; the complex difference categories of each knitting sub-region are divided to further adjust and determine the rotational speed of the looping mechanism according to the specific complex difference categories, while effectively ensuring the integrity of the knitted fabric, further improving the production efficiency of the circular knitting machine.

[0047] Furthermore, the present invention divides the complex difference categories of each knitting sub-region based on the knitting jacquard characterization parameters. During the knitting process, for strongly complex difference categories, any tiny error may cause pattern misalignment or damage, and the looping mechanism needs to perform more frequent and precise actions. The yarn smoothness is obtained based on the hook line image information to monitor the specific situation of the yarn in real time. When the yarn smoothness is greater than the preset yarn smoothness, the operating parameters of the looping mechanism are adjusted in a timely manner to ensure the tightness of the fabric, further improving the production efficiency of the circular knitting machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is a block diagram of the jacquard control system based on the circular knitting machine according to an embodiment of the present invention;

[0049] Figure 2 is a logic decision diagram for dividing the complex difference categories of the knitting sub-regions according to an embodiment of the present invention;

[0050] Figure 3 is a logic decision diagram for controlling the looping mechanism to knit the knitting sub-region based on the complex difference category of a single knitting sub-region according to an embodiment of the present invention;

[0051] Figure 4 is a logic decision diagram for determining whether to re-determine the rotational speed of the looping mechanism according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0052] In order to make the objectives and advantages of the present invention clearer, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0053] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0054] It should be noted that in the description of the present invention, the terms indicating the direction or positional relationship such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the direction or positional relationship shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0055] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 as shown in Figure 1 which is a block diagram of the jacquard control system based on a circular knitting machine according to an embodiment of the present invention; Figure 2 which is a logical decision diagram for classifying complex differences in knitting sub-regions according to an embodiment of the present invention; Figure 3 which is a logical decision diagram for controlling the loop-forming mechanism to knit a knitting sub-region based on the complex difference category of a single knitting sub-region according to an embodiment of the present invention; Figure 4 which is a logical decision for determining whether to re-determine the rotational speed of the loop-forming mechanism: An embodiment of the present invention provides a jacquard control system based on a circular knitting machine, including:

[0057] A loop-forming mechanism for knitting yarn into loops to form a knitted fabric, including knitting needles for hooking the yarn and forming loops;

[0058] A yarn feeding mechanism for feeding the yarn to the loop-forming mechanism;

[0059] A data processing mechanism connected to the yarn feeding mechanism and the loop-forming mechanism respectively, for respectively determining the initial jacquard programs of the yarn feeding mechanism and the loop-forming mechanism based on the jacquard preview diagram, and respectively controlling the yarn feeding mechanism and the loop-forming mechanism to operate according to the initial jacquard programs;

[0060] A monitoring mechanism including a high-speed camera disposed on one side of the loop-forming mechanism for acquiring the wire-hooking image information of the knitting needles hooking the yarn;

[0061] A feature analysis module connected to the data processing mechanism and the monitoring mechanism respectively, for acquiring the jacquard complex features in each knitting sub-region of the jacquard preview diagram, and calculating the knitting jacquard characterization parameters in combination with the yarn tension characteristic parameters. The jacquard complex features include the chromaticity doping difference amount and the jacquard area ratio;

[0062] A knitting control mechanism connected to the data processing mechanism, the monitoring mechanism and the feature analysis module respectively, for classifying the complex difference categories of each knitting sub-region according to the knitting jacquard characterization parameters, and controlling the loop-forming mechanism according to the complex difference categories, including

[0063] Determine the rotational speed of the loop-forming mechanism according to the knitting jacquard characterization parameters, obtain the yarn smoothness based on the hook line image information, and determine whether to correct the rotational speed of the loop-forming mechanism according to the proportion of the jacquard area based on the yarn smoothness;

[0064] Or, control the loop-forming mechanism to run at a predetermined rotational speed to complete the knitting of the loops.

[0065] Specifically, the specific structures of the loop-forming mechanism and the yarn feeding mechanism are not specifically limited in this solution. Generally, in the prior art, the loop-forming mechanism runs at a predetermined rotational speed to complete the knitting of the loops. Commonly, the knitting speed of the loops is controlled by controlling the rotational speed of the loop-forming mechanism to ensure the coordination between the fabric quality and the production efficiency of the fabric. The loop-forming mechanism may include a motor for controlling the rotational speed of the loop-forming mechanism, gears and belts for transmission, knitting needles for hooking the yarn and forming loops, a needle cylinder for supporting the knitting needles and enabling them to run according to a predetermined program, loop-forming cams for controlling the movement trajectory of the knitting needles and completing the loop-forming action, and a traction device for pulling the knitted fabric out of the loop-forming area. It can be understood that the loop-forming mechanism can achieve the purpose of knitting jacquard on the yarn, and the yarn feeding mechanism can achieve the purpose of feeding yarn to the loop-forming mechanism. This is the prior art and will not be elaborated further.

[0066] Specifically, before the loop-forming mechanism runs, the data processing mechanism will determine the initial jacquard program of the loop-forming mechanism and the yarn feeding mechanism according to the input jacquard preview pattern. The feature analysis module divides the jacquard preview pattern into several knitting sub-regions, and calculates the knitting jacquard characterization parameters according to the jacquard complexity features and the yarn tension characteristic parameters of the yarn in each knitting sub-region, so as to divide the complex difference categories of each knitting sub-region according to the knitting jacquard characterization parameters, and determine the rotational speed of the loop-forming mechanism of a single knitting sub-region, which further improves the production efficiency of the circular knitting machine while ensuring the accuracy of the jacquard pattern.

[0067] Specifically, the specific structures of the feature analysis module, the data processing mechanism, and the knitting control mechanism are not limited. They can all be composed of logic components. The logic components can be field programmable components, computers, and microprocessors in the computer, etc. The specific method for determining the initial operation program of the yarn feeding mechanism and the knitting mechanism is not limited. Computer jacquard pattern-making software can be used to design the jacquard program according to the jacquard preview pattern. This is the prior art and will not be elaborated further.

[0068] Specifically, based on the input jacquard preview image, the data processing mechanism generates an initial jacquard program, which includes pattern data that converts the designed pattern into a data format understandable by the machine, including the color, texture, and shape of the pattern. Needle number assignment determines which knitting needles will participate in forming each part of the pattern and decomposes the pattern into units that can be knitted by the needles on the machine. The yarn feeding sequence determines when and in what order the yarn feeding mechanism should feed different types of yarns according to the pattern requirements. Jacquard control sets the control parameters of the jacquard mechanism to ensure that the correct pattern is formed in the correct position. The control parameters of the jacquard mechanism include jacquard height, jacquard depth, and jacquard speed.

[0069] Specifically, the present invention does not make specific limitations on the division within the knitted sub-regions of the jacquard preview image. It can be understood that the division of the knitted sub-regions is essentially the division of each knitted region of the jacquard preview image, which can be evenly divided by equal area or divided according to the density of the jacquard distribution. This is prior art and will not be elaborated further.

[0070] Specifically, the feature analysis module is used to obtain the jacquard complex features within each knitted sub-region of the jacquard preview image, including

[0071] Converting the jacquard preview image of a single knitted sub-region into a grayscale image;

[0072] Clustering each grayscale region in the grayscale image to frame different clustering clusters; it can be understood that the number of clustering clusters can reflect the doping situation of chromaticity.

[0073] Calculating the total length of each framed curve as the chromaticity doping difference amount;

[0074] Determining the jacquard region in the jacquard preview image corresponding to a single knitted sub-region;

[0075] Solving the ratio of the total area of each jacquard region in a single knitted sub-region to the area of the knitted sub-region as the jacquard area ratio.

[0076] Specifically, the feature analysis module is used to obtain the yarn tension characteristic parameters, including

[0077] Obtaining the fineness of each yarn and taking the average value of the calculated fineness of each yarn as the yarn tension characteristic parameter.

[0078] Specifically, the feature analysis module is used to obtain the knitted jacquard characterization parameters, including:

[0079] Solving the ratio of the chromaticity doping difference amount to the average value of the chromaticity doping difference amounts of each historical jacquard preview image to obtain the doping degree characterization amount;

[0080] Solve the ratio of the jacquard area ratio to the average value of the jacquard area ratios of each historical jacquard preview image to obtain the area ratio characterization quantity;

[0081] Solve the ratio of the average value of each yarn tension characteristic parameter corresponding to each historical jacquard preview image to the yarn tension characteristic parameter to obtain the tension characterization quantity;

[0082] Sum the doping degree characterization quantity, the area ratio characterization quantity, and the tension characterization quantity by assigning corresponding weight coefficients respectively to obtain the knitted jacquard characterization parameter.

[0083] Specifically, the corresponding weight coefficient of the doping degree characterization quantity is that the chromaticity weight coefficient is 0.4, the corresponding weight coefficient of the area ratio characterization quantity is that the jacquard weight coefficient is 0.4, and the corresponding weight coefficient of the tension characterization quantity is that the tension weight coefficient is 0.2, and the assignment method is summation.

[0084] Specifically, the number of selected historical jacquard preview images can be freely set by those skilled in the art, and only needs to divide the complex situations of each knitted sub-region when knitting a single jacquard preview image. This is the prior art and will not be elaborated here.

[0085] Specifically, the present invention calculates the knitted jacquard characterization parameter based on the jacquard complex characteristics and the yarn tension characteristic parameters. In actual situations, the jacquard area of the fabric requires more precise control and a more complex loop formation process. To ensure the accuracy of the jacquard pattern, a lower rotational speed of the circular knitting machine is inevitably required. The more colors there are in the jacquard fabric and the more complex the color doping situation, it means that the yarn needs to be changed more frequently during the knitting process. To ensure accurate yarn change each time, a lower rotational speed of the circular knitting machine is inevitably required; the thicker the yarn, the greater the tension it can withstand. Coarse yarns require greater force to maintain their shape and structure during processing, especially on high-speed machines. Coarse yarns are not easily broken when stretched, so they can withstand greater tension, while finer yarns require a slower rotational speed of the circular knitting machine to ensure the integrity of the knitted fabric; therefore, the complexity of the jacquard preview image and the difficulty of knitting are characterized by the knitted jacquard characterization parameter, and the complex difference categories of each knitted sub-region are divided, so as to further adjust and determine the rotational speed of the loop formation mechanism according to the specific complex difference categories, effectively ensuring the integrity of the knitted fabric while further improving the production efficiency of the circular knitting machine.

[0086] Specifically, the knitted control mechanism divides the complex difference categories of each knitted sub-region based on the knitted jacquard characterization parameter, including

[0087] If the knitted jacquard characterization parameter is less than or equal to the preset knitted jacquard characterization parameter, then a single knitted sub-region is divided into a weakly complex difference category;

[0088] If the knitted jacquard characterization parameter is greater than the preset knitted jacquard characterization parameter, then a single knitted sub-region is divided into a strong complex difference category.

[0089] The preset knitted jacquard characterization parameter Z0 is selected within the range [0.61, 0.75].

[0090] Specifically, the knitting control mechanism controls the loop-forming mechanism to perform knitting on the knitted sub-region based on the complex difference category of the single knitted sub-region, including

[0091] If the single knitted sub-region is a weak complex difference category, then control the loop-forming mechanism to run at a predetermined speed to complete the knitting of the loop;

[0092] If the single knitted sub-region is a strong complex difference category, then determine the speed of the loop-forming mechanism according to the knitted jacquard characterization parameter.

[0093] Specifically, the knitting control mechanism determines the speed of the loop-forming mechanism according to the knitted jacquard characterization parameter, where

[0094] The speed of the loop-forming mechanism determined by the knitting control mechanism is inversely proportional to the knitted jacquard characterization parameter.

[0095] In this embodiment, optionally,

[0096] Compare the knitted jacquard characterization parameter with the first preset jacquard comparison threshold and the second preset jacquard comparison threshold,

[0097] If the knitted jacquard characterization parameter is less than or equal to the first preset jacquard comparison threshold, then determine the speed of the loop-forming mechanism to be 0.91 times the initial speed;

[0098] If the knitted jacquard characterization parameter is less than or equal to the second preset jacquard comparison threshold and greater than the first preset jacquard comparison threshold, then determine the speed of the loop-forming mechanism to be 0.83 times the initial speed;

[0099] If the knitted jacquard characterization parameter is greater than the second preset jacquard comparison threshold, then determine the speed of the loop-forming mechanism to be 0.77 times the initial speed;

[0100] Among them, the first preset jacquard comparison threshold is taken as 1.3Z0, and the second preset jacquard comparison threshold is taken as 1.45Z0.

[0101] Specifically, the knitting control mechanism obtains the yarn smoothness based on the thread-hooking image information, including

[0102] The yarn characteristics for obtaining the thread-hooking image information;

[0103] The curve region in the yarn characteristics for obtaining the yarn characteristics, and the curve region in the yarn characteristics includes the curved part and the straightened straight region;

[0104] To calculate the ratio of the length corresponding to the curve region to the total length of the yarn features in the stitch image information as the yarn smoothness.

[0105] Specifically, the knitting control mechanism determines whether to re-determine the rotational speed of the loop-forming mechanism based on the yarn smoothness, including

[0106] If the yarn smoothness is less than or equal to the preset yarn smoothness, continue to use the current rotational speed as the operating parameter of the loop-forming mechanism;

[0107] If the yarn smoothness is greater than the preset yarn smoothness, re-determine the rotational speed of the loop-forming mechanism based on the jacquard area ratio.

[0108] Among them, the preset yarn smoothness P0 is selected within the interval [0.98X0, 1.16X0], and X0 represents the average value of the obtained historical yarn smoothnesses.

[0109] Specifically, the present invention does not limit the number of the obtained historical yarn smoothnesses, which can be freely set by those skilled in the art. It only needs to determine the specific operating conditions of knitting when monitoring the loop-forming mechanism. This is the prior art and will not be elaborated herein.

[0110] Specifically, the present invention divides the complex difference categories of each knitting sub-region based on the knitting jacquard characterization parameters. During the knitting process, for the strong complex difference categories, any minor error may cause pattern misalignment or damage. The loop-forming mechanism needs to act more frequently and precisely. The yarn smoothness is obtained based on the stitch image information to monitor the specific situation of the yarn in real time. When the yarn smoothness is greater than the preset yarn smoothness, the operating parameters of the loop-forming mechanism are adjusted in a timely manner to ensure the tightness of the fabric, further improving the production efficiency of the circular knitting machine.

[0111] Specifically, the knitting control mechanism is used to determine the correction amplitude of the rotational speed of the loop-forming mechanism based on the jacquard area ratio, where

[0112] The correction amplitude of the rotational speed of the loop-forming mechanism determined by the knitting control mechanism is positively correlated with the jacquard area ratio.

[0113] In this embodiment, optionally,

[0114] Compare the jacquard area ratio with the first preset area comparison threshold and the second preset area comparison threshold;

[0115] If the jacquard area ratio is less than or equal to the first preset area comparison threshold, determine the increase amount of the rotational speed of the loop-forming mechanism as the first increase amount, and set the first increase amount to be 0.24 times the current rotational speed of the loop-forming mechanism;

[0116] If the jacquard area ratio is less than or equal to the second preset area ratio comparison threshold and greater than the first preset area ratio comparison threshold, the increase in the rotation speed of the looping mechanism is determined as the second increase, and the second increase is set to 0.19 times the current rotation speed of the looping mechanism;

[0117] If the jacquard area ratio is greater than the second preset area ratio comparison threshold, the increase in the rotation speed of the looping mechanism is determined as the third increase, and the third increase is set to 0.12 times the current rotation speed of the looping mechanism;

[0118] Among them, the first preset area ratio comparison threshold is taken as 1.13J0, the second preset area ratio comparison threshold is taken as 1.27J0, and J0 represents the average value of the jacquard area ratio of each historical jacquard preview diagram.

[0119] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

[0120] The above are only the preferred embodiments of the present invention and are not used to limit the present invention; for those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A jacquard control system based on a circular knitting machine, characterized in that Including: A looping mechanism for knitting yarn into loops to form a knitted fabric, including knitting needles for hooking the yarn and forming loops; A yarn feeding mechanism for feeding the yarn to the looping mechanism; A data processing mechanism respectively connected to the yarn feeding mechanism and the looping mechanism, for respectively determining the initial jacquard programs of the yarn feeding mechanism and the looping mechanism based on a jacquard preview pattern, and respectively controlling the yarn feeding mechanism and the looping mechanism to operate according to the initial jacquard programs; A monitoring mechanism including a high-speed camera disposed on one side of the looping mechanism for acquiring wire-hooking image information of the knitting needles hooking the yarn; A feature analysis module respectively connected to the data processing mechanism and the monitoring mechanism, for acquiring the jacquard complex features in each knitted sub-region of the jacquard preview pattern, and calculating the knitted jacquard characterization parameters in combination with the yarn tension characteristic parameters, where the jacquard complex features include the chromaticity doping difference amount and the jacquard area ratio; A knitting control mechanism respectively connected to the data processing mechanism, the monitoring mechanism and the feature analysis module, for classifying the complex difference categories of each knitted sub-region according to the knitted jacquard characterization parameters, and controlling the looping mechanism according to the complex difference categories, Including, Determining the rotation speed of the looping mechanism according to the knitted jacquard characterization parameters, acquiring the yarn smoothness based on the wire-hooking image information, so as to determine whether to correct the rotation speed of the looping mechanism according to the jacquard area ratio; Or, controlling the looping mechanism to operate at a predetermined rotation speed to complete the knitting of the loops; The feature analysis module is used to acquire the jacquard complex features in each knitted sub-region of the jacquard preview pattern, including, Converting the jacquard preview pattern of a single knitted sub-region into a grayscale image; Respectively performing frame selection on each grayscale region in the grayscale image; Calculating the total length of each selected curve as the chromaticity doping difference amount; Determining the jacquard region in the jacquard preview pattern corresponding to a single knitted sub-region; Solving the ratio of the total area of each jacquard region in a single knitted sub-region to the area of the knitted sub-region as the jacquard area ratio.

2. The jacquard control system based on a circular knitting machine according to claim 1, characterized in that The feature analysis module is used to acquire the yarn tension characteristic parameters, including, Acquiring the fineness of each yarn, and taking the average value of the calculated finenesses of each yarn as the yarn tension characteristic parameter.

3. The jacquard control system based on a circular knitting machine according to claim 2, wherein, The feature analysis module is used to acquire the knitted jacquard characterization parameters, including: Solving the ratio of the chromaticity doping difference amount to the average value of the chromaticity doping difference amounts of each historical jacquard preview pattern to obtain the doping degree characterization quantity; Solving the ratio of the jacquard area ratio to the average value of the jacquard area ratios of each historical jacquard preview pattern to obtain the area ratio characterization quantity; Solving the ratio of the average value of the yarn tension characteristic parameters corresponding to each historical jacquard preview pattern to the yarn tension characteristic parameter to obtain the tension characterization quantity; Assigning corresponding weight coefficients to the doping degree characterization quantity, the area ratio characterization quantity and the tension characterization quantity respectively and summing them to obtain the knitted jacquard characterization parameter.

4. The jacquard control system based on a circular knitting machine according to claim 3, characterized in that The knitting control mechanism classifies the complex difference categories of each knitted sub-region based on the knitted jacquard characterization parameters, including, If the knitted jacquard characterization parameter is less than or equal to a preset knitted jacquard characterization parameter, classifying a single knitted sub-region into a weak complex difference category; If the knitting jacquard characterization parameter is greater than the preset knitting jacquard characterization parameter, then a single knitting sub-region is divided into a strong complex difference category.

5. The jacquard control system based on a circular knitting machine according to claim 4, characterized in that The knitting control mechanism controls the loop-forming mechanism to perform knitting on the knitting sub-region based on the complex difference category of the single knitting sub-region, including if the single knitting sub-region is a weak complex difference category, controlling the loop-forming mechanism to run at a predetermined speed to complete the knitting of the loop; if the single knitting sub-region is a strong complex difference category, determining the speed of the loop-forming mechanism according to the knitting jacquard characterization parameter, obtaining the yarn smoothness based on the hook line image information, and determining whether to correct the speed of the loop-forming mechanism according to the jacquard area ratio based on the yarn smoothness.

6. The jacquard control system based on a circular knitting machine according to claim 5, wherein, The knitting control mechanism determines the speed of the loop-forming mechanism according to the knitting jacquard characterization parameter, where the speed of the loop-forming mechanism determined by the knitting control mechanism is inversely proportional to the knitting jacquard characterization parameter.

7. The jacquard control system based on a circular knitting machine according to claim 6, wherein The knitting control mechanism obtains the yarn smoothness based on the hook line image information, including the yarn features for obtaining the hook line image information, and the yarn features include a curved region of the bent part and a straightened linear region; calculating the ratio of the length corresponding to the curved region to the total length of the yarn features in the hook line image information as the yarn smoothness.

8. The jacquard control system based on a circular knitting machine according to claim 7, characterized in that, The knitting control mechanism determines whether to re-determine the speed of the loop-forming mechanism based on the yarn smoothness, including if the yarn smoothness is less than or equal to the preset yarn smoothness, continuously using the current speed as the operating parameter of the loop-forming mechanism; if the yarn smoothness is greater than the preset yarn smoothness, re-determining the speed of the loop-forming mechanism based on the jacquard area ratio.

9. The jacquard control system based on a circular knitting machine according to claim 8, characterized in that, The knitting control mechanism is used to determine the correction amplitude of the speed of the loop-forming mechanism based on the jacquard area ratio, where the correction amplitude of the speed of the loop-forming mechanism determined by the knitting control mechanism is positively correlated with the jacquard area ratio.

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