Jacquard control system based on circular knitting machine

Abstract

The invention relates to the technical field of jacquard knitting, in particular to a jacquard control system based on a circular knitting machine, which comprises a looping mechanism, a yarn feeding mechanism, a data processing mechanism, a monitoring mechanism, a feature analysis module and a knitting control mechanism, the data processing mechanism determines initial jacquard programs of the looping mechanism and the yarn feeding mechanism according to an input jacquard preview, and the feature analysis module divides the jacquard preview into a plurality of knitting sub-areas and calculates knitting jacquard characterization parameters according to jacquard complex features in the knitting sub-areas and yarn tension feature parameters of yarns. The complex difference categories of all the knitting sub-areas are divided according to the knitting jacquard characterization parameters, the rotating speed of the looping mechanism of the single knitting sub-area is determined according to the complex difference categories, and the production efficiency of the circular knitting machine is improved.

Description

Technical Field

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

[0002] The circular knitting machine is also called a large circular machine or a circular weft knitting machine. It is generally composed of a frame, a yarn supply assembly, a knitting assembly, a transmission assembly, a lubrication and dust removal assembly, an electrical control assembly, a pulling and winding assembly and other auxiliary devices. It has developed rapidly due to its high speed, high output, fast shape changes, good fabric quality, fewer processes and strong product adaptability.

[0003] Chinese patent publication number: CN110106616A, discloses a jacquard knitting circular machine, the equipment body is composed of a large top cover, a large top cover outer plate, a main transmission shaft, a large top plate, a middle foot, an auxiliary transmission shaft, a motor drive device, a motor seat, a seven-character tripod, a lower needle plate, a middle knitting needle, a scaler, a lower saddle, a lower knitting needle, an upper knitting needle, a yarn feeding mouth, a spring, an upper needle plate, a middle core latch, a middle core, a lower saddle bottom ring, a jacquard piece, an upper needle plate seat, an upper cutting plate, a large top cover inner plate, a sleeve, a needle selector, a needle selector seat, a needle selector base, a large plate gear, and a large plate base. The triangle block has many variations and a wide range of organizational adjustment. It can be cut one by one or cut with a hook knife in one, and the trajectory of the knife needle can be changed by changing the triangle track; However, there are still the following problems in the prior art: Due to the different jacquard difficulty in different areas of the same knitted fabric, a unified operating speed is adopted for different knitting areas, which affects the production efficiency of the circular knitting machine. Summary of the invention

[0004] To this end, the present invention provides a jacquard control system based on a circular knitting machine, so as to overcome the problem in the prior art that the corresponding operating speeds for different knitting areas are not considered, thus affecting the production efficiency of the circular knitting machine.

[0005] To achieve the above object, the present invention provides a jacquard control system based on a circular knitting machine, comprising: A loop forming mechanism, which is used to weave the yarn into loops to form a knitted fabric, including a knitting needle for hooking the yarn and forming a loop; A yarn feeding mechanism, used for feeding the yarn to the loop forming mechanism; A data processing mechanism, which is connected to the yarn feeding mechanism and the loop forming mechanism respectively, and is used to determine the initial jacquard programs of the yarn feeding mechanism and the loop forming mechanism respectively based on the jacquard preview image, and respectively control the yarn feeding mechanism and the loop forming mechanism to operate according to the initial jacquard program; A monitoring mechanism includes a high-speed camera arranged on one side of the loop forming mechanism for obtaining image information of the yarn being hooked by the knitting needle; A feature analysis module, which is connected to the data processing mechanism and the monitoring mechanism respectively, and is used to obtain the complex features of the jacquard in each knitted sub-area in the jacquard preview image, and calculate the knitted jacquard characterization parameters in combination with the yarn tension characteristic parameters, wherein the complex features of the jacquard include the chromaticity doping difference and the jacquard area ratio; A knitting control mechanism, which is respectively connected to the data processing mechanism, the monitoring mechanism and the feature analysis module, is used to classify the complex difference categories of each knitting sub-area according to the knitting jacquard characterization parameters, and control the loop forming mechanism according to the complex difference categories, including: Determine the rotation speed of the loop forming mechanism according to the knitting jacquard characterization parameters, obtain the yarn smoothness based on the hooking line image information, and determine whether to correct the rotation speed of the loop forming mechanism according to the jacquard area ratio according to the yarn smoothness; Or, the knitting mechanism is controlled to run at a predetermined speed to complete the knitting of the loops.

[0006] Furthermore, the feature analysis module is used to obtain the complex features of the jacquard in each knitting sub-area in the jacquard preview image, including: Used to convert the jacquard preview image of a single knitted sub-area into a grayscale image; Used to select each grayscale area in the grayscale image; Used to calculate the total length of each frame selection curve as the chromaticity doping difference; Used to determine the jacquard area in the jacquard preview image corresponding to a single knitting sub-area; It is used to solve the ratio of the total area of ​​each jacquard area in a single knitted sub-area to the area of ​​the knitted sub-area as the jacquard area ratio.

[0007] Furthermore, the characteristic analysis module is used to obtain characteristic parameters of yarn tension, including: It is used to obtain the fineness of each yarn, and to take the average value of the calculated fineness of each yarn as the characteristic parameter of the yarn tension.

[0008] Furthermore, the feature analysis module is used to obtain knitted jacquard characterization parameters, including: The ratio of the chromaticity doping difference amount to the average value of the chromaticity doping difference amount of each historical jacquard preview image is solved to obtain the doping degree characterization amount; Calculate the ratio of the jacquard area ratio to the average jacquard area ratio of each historical jacquard preview image to obtain the area ratio representation; 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 representation value; The doping degree characterization quantity, area ratio characterization quantity and tension characterization quantity are respectively assigned corresponding weight coefficients and summed up to obtain the knitting jacquard characterization parameters.

[0009] Furthermore, the knitting control mechanism divides each knitting sub-area into complex difference categories based on the knitting jacquard characterization parameters, including: If the knitted jacquard characterization parameter is less than or equal to the preset knitted jacquard characterization parameter, the single knitted sub-region is classified into a weak complex difference category; If the knitted jacquard characterization parameter is greater than the preset knitted jacquard characterization parameter, the single knitted sub-region is classified into a strong complex difference category.

[0010] Further, 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: If a single knitting sub-area is of a weakly complex difference category, the loop forming mechanism is controlled to run at a predetermined speed to complete the knitting of the loop; If a single knitted sub-area belongs to the strong complex difference category, the rotation speed of the loop forming mechanism is determined according to the knitted jacquard characterization parameters, and the yarn smoothness is obtained based on the hook line image information to determine whether to correct the rotation speed of the loop forming mechanism according to the jacquard area ratio based on the yarn smoothness.

[0011] Furthermore, the knitting control mechanism determines the rotation speed of the loop forming mechanism according to the knitting jacquard characterization parameters, wherein: The rotation speed of the loop forming mechanism determined by the knitting control mechanism is inversely proportional to the knitting jacquard characterization parameter.

[0012] Furthermore, the knitting control mechanism obtains the yarn smoothness based on the hooking image information, including: The yarn features used to obtain the hook line image information, the yarn features include the curved area of ​​the curved part and the straight line area of ​​the straightened part; The ratio of the length corresponding to the curve area to the total length of the yarn feature in the hook line image information is used to calculate the yarn smoothness.

[0013] Further, the knitting control mechanism determines whether to re-determine the rotation 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, the current rotation speed is continuously used as the operating parameter of the loop forming mechanism; If the yarn smoothness is greater than the preset yarn smoothness, the rotation speed of the loop forming mechanism is re-determined based on the jacquard area ratio.

[0014] Furthermore, the knitting control mechanism is used to determine the correction amplitude of the rotation speed of the loop forming mechanism based on the jacquard area ratio, wherein: The correction range of the rotation speed of the loop forming mechanism determined by the knitting control mechanism is positively correlated with the jacquard area ratio.

[0015] Compared with the prior art, the beneficial effect of the present invention lies in that, before the loop forming mechanism is operated, 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 image, and the feature analysis module will divide the jacquard preview image into several knitting sub-areas, and calculate the knitting jacquard characterization parameters according to the jacquard complex characteristics in each knitting sub-area and the yarn tension characteristic parameters of the yarn, so as to divide the complex difference categories of each knitting sub-area according to the knitting jacquard characterization parameters, and determine the rotation speed of the loop forming mechanism of a single knitting sub-area according to the complex difference category, thereby further improving the production efficiency of the large circular knitting machine while ensuring the accuracy of the jacquard pattern.

[0016] Furthermore, the present invention calculates the knitting jacquard characterization parameters based on the jacquard complex characteristics and the yarn tension characteristic parameters. In actual situations, the jacquard area of ​​the fabric requires more sophisticated control and a more complex looping process. To ensure the accuracy of the jacquard pattern, a lower rotation speed of the circular knitting machine is bound to be required. The more color types there are in the jacquard fabric, the more complex the color mixing is, which means that the yarn needs to be replaced more frequently during the weaving process. To ensure accurate yarn replacement each time, a lower rotation speed of the circular knitting machine is bound to be required; the thicker the yarn, the greater the tension it can withstand. The thick yarn requires greater force to maintain its shape and structure during processing, especially on a high-speed machine. The thick yarn is not easy to break when stretched, so it can withstand greater tension, while the thinner yarn requires a slower rotation 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 knitting jacquard characterization parameters; the complex difference categories of each knitting sub-area are divided, so as to further adjust and determine the rotation speed of the looping mechanism according to the specific complex difference categories, while effectively ensuring the integrity of the knitted fabric, the production efficiency of the circular knitting machine is further improved.

[0017] Furthermore, the present invention divides each knitting sub-area into complex difference categories based on the knitting jacquard characterization parameters. During the knitting process, for the strong complex difference categories, any slight error may cause the pattern to be misaligned or damaged. The loop-forming mechanism needs to move more frequently and precisely. The yarn smoothness is obtained based on the hook 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 time to ensure the tightness of the fabric, thereby further improving the production efficiency of the large circular knitting machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a module block diagram of a jacquard control system based on a circular knitting machine according to an embodiment of the present invention; Figure 2 A logical decision diagram for dividing the complex difference categories of knitted sub-areas according to an embodiment of the present invention; Figure 3A logic decision diagram for controlling a loop forming mechanism to knit a knitting sub-region based on a complex difference category of a single knitting sub-region according to an embodiment of the present invention; Figure 4 The present invention is a logic decision diagram for determining whether to redetermine the rotation speed of the loop forming mechanism according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the objects and advantages of the present invention more clearly understood, the present invention is 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.

[0020] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0021] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the 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. Therefore, it cannot be understood as a limitation on the present invention.

[0022] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of 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.

[0023] See also Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, Figure 1 It is a module block diagram of a jacquard control system based on a circular knitting machine according to an embodiment of the present invention; Figure 2 A logical decision diagram for dividing the complex difference categories of knitted sub-areas according to an embodiment of the present invention; Figure 3 A logic decision diagram for controlling a loop forming mechanism to knit a knitting sub-region based on a complex difference category of a single knitting sub-region according to an embodiment of the present invention; Figure 4 The logic judgment of determining whether to redetermine the rotation speed of the loop forming mechanism in the embodiment of the present invention is as follows: The jacquard control system based on a circular knitting machine in the embodiment of the present invention comprises: A loop forming mechanism, which is used to weave the yarn into loops to form a knitted fabric, including a knitting needle for hooking the yarn and forming a loop; A yarn feeding mechanism, used for feeding the yarn to the loop forming mechanism; A data processing mechanism, which is connected to the yarn feeding mechanism and the loop forming mechanism respectively, and is used to determine the initial jacquard programs of the yarn feeding mechanism and the loop forming mechanism respectively based on the jacquard preview image, and respectively control the yarn feeding mechanism and the loop forming mechanism to operate according to the initial jacquard program; A monitoring mechanism includes a high-speed camera arranged on one side of the loop forming mechanism for obtaining image information of the yarn being hooked by the knitting needle; A feature analysis module, which is connected to the data processing mechanism and the monitoring mechanism respectively, and is used to obtain the complex features of the jacquard in each knitted sub-area in the jacquard preview image, and calculate the knitted jacquard characterization parameters in combination with the yarn tension characteristic parameters, wherein the complex features of the jacquard include the chromaticity doping difference and the jacquard area ratio; A knitting control mechanism, which is respectively connected to the data processing mechanism, the monitoring mechanism and the feature analysis module, is used to classify the complex difference categories of each knitting sub-area according to the knitting jacquard characterization parameters, and control the loop forming mechanism according to the complex difference categories, including: Determine the rotation speed of the loop forming mechanism according to the knitting jacquard characterization parameters, obtain the yarn smoothness based on the hooking line image information, and determine whether to correct the rotation speed of the loop forming mechanism according to the jacquard area ratio according to the yarn smoothness; Or, the knitting mechanism is controlled to run at a predetermined speed to complete the knitting of the loops.

[0024] Specifically, the present invention does not make any specific limitation on the specific structures of the looping mechanism and the yarn feeding mechanism. Usually in the prior art, the looping mechanism runs at a predetermined speed to complete the knitting of the coil. It is common to control the knitting speed of the coil by controlling the speed of the looping mechanism to ensure that the fabric quality and the fabric production efficiency are coordinated. The looping mechanism may include a motor for controlling the speed of the looping mechanism, gears and belts for transmission, knitting needles for hooking the yarn and forming the coil, a needle cylinder for supporting the knitting needle and making it run according to a predetermined program, a needle cylinder for controlling the movement trajectory of the knitting needle, a looping triangle for completing the looping action, and a traction device for pulling the woven fabric out of the looping area. It can be understood that the looping mechanism can achieve the purpose of knitting jacquard on the yarn, and the yarn feeding mechanism can achieve the purpose of feeding the yarn to the looping mechanism. This is the prior art and will not be repeated.

[0025] Specifically, before the loop forming mechanism is operated, 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 image. The feature analysis module will divide the jacquard preview image into several knitting sub-areas, and calculate the knitting jacquard characterization parameters according to the jacquard complex characteristics in each knitting sub-area and the yarn tension characteristic parameters of the yarn, so as to divide the complex difference categories of each knitting sub-area according to the knitting jacquard characterization parameters, and determine the rotation speed of the loop forming mechanism of a single knitting sub-area according to the complex difference category, so as to further improve the production efficiency of the large circular knitting machine while ensuring the accuracy of the jacquard pattern.

[0026] Specifically, there is no limitation on the specific structures of the feature analysis module, the data processing mechanism and the knitting control mechanism, and they can all be composed of logical components. The logical components can be field programmable components, computers, and microprocessors in computers, etc. There is no limitation on the specific method of determining the initial operating program of the yarn feeding mechanism and the knitting mechanism, and computer jacquard plate making software can be used to design the jacquard program according to the jacquard preview image. This is a prior art and will not be repeated here.

[0027] Specifically, the data processing mechanism generates an initial jacquard program based on the input jacquard preview image. This program includes: pattern data, which converts the design pattern into a data format that the machine can understand, including the color, texture and shape of the pattern. Needle number allocation, which determines which knitting needles will be involved in forming each part of the pattern, and decomposes the pattern into units that can be woven by the needles on the machine. Yarn feeding sequence, which determines when and in what order the yarn feeding mechanism should feed different types of yarn according to the pattern requirements. Jacquard control, which 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.

[0028] Specifically, the present invention does not specifically limit the division within the knitted sub-area of ​​the jacquard preview image. It can be understood that the division of the knitted sub-area is essentially a division of each knitted area of ​​the jacquard preview image, which can be divided into equal areas or divided according to the density of the jacquard distribution. This is a prior art and will not be repeated here.

[0029] Specifically, the feature analysis module is used to obtain the complex features of the jacquard in each knitting sub-area in the jacquard preview image, including: Used to convert the jacquard preview image of a single knitted sub-area into a grayscale image; It is used to cluster the grayscale areas in the grayscale image respectively to select different clusters; it can be understood that the number of clusters can reflect the mixing of chromaticity.

[0030] Used to calculate the total length of each frame selection curve as the chromaticity doping difference; Used to determine the jacquard area in the jacquard preview image corresponding to a single knitting sub-area; It is used to solve the ratio of the total area of ​​each jacquard area in a single knitted sub-area to the area of ​​the knitted sub-area as the jacquard area ratio.

[0031] Specifically, the characteristic analysis module is used to obtain the characteristic parameters of the yarn tension, including: It is used to obtain the fineness of each yarn, and to take the average value of the calculated fineness of each yarn as the characteristic parameter of the yarn tension.

[0032] Specifically, the feature analysis module is used to obtain knitted jacquard characterization parameters, including: The ratio of the chromaticity doping difference amount to the average value of the chromaticity doping difference amount of each historical jacquard preview image is solved to obtain the doping degree characterization amount; Calculate the ratio of the jacquard area ratio to the average jacquard area ratio of each historical jacquard preview image to obtain the area ratio representation; 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 representation value; The doping degree characterization quantity, area ratio characterization quantity and tension characterization quantity are respectively assigned corresponding weight coefficients and summed up to obtain the knitting jacquard characterization parameters.

[0033] Specifically, the corresponding weight coefficient of the doping degree characterization quantity is the chromaticity weight coefficient which is 0.4, the corresponding weight coefficient of the area ratio characterization quantity is the jacquard weight coefficient which is 0.4, and the corresponding weight coefficient of the tension characterization quantity is the tension weight coefficient which is 0.2, and the assignment method is summation.

[0034] Specifically, the number of selected historical jacquard preview images can be freely set by those skilled in the art. It is only necessary to divide the complex situations of each knitting sub-area when weaving a single jacquard preview image. This is the prior art and will not be described in detail.

[0035] Specifically, the present invention calculates the knitting jacquard characterization parameters based on the jacquard complex characteristics and the yarn tension characteristic parameters. In actual situations, the jacquard area of ​​the fabric requires more sophisticated control and a more complex looping process. In order to ensure the accuracy of the jacquard pattern, a lower rotation speed of the circular knitting machine is bound to be required. The more color types in the jacquard fabric, the more complex the color mixing situation, which means that the yarn needs to be replaced more frequently during the weaving process. In order to ensure accurate yarn replacement each time, a lower rotation speed of the circular knitting machine is bound to be required; the thicker the yarn, the greater the tension it can withstand. The thick yarn requires greater force to maintain its shape and structure during processing, especially on a high-speed machine. The thick yarn is not easy to break when stretched, so it can withstand greater tension, while the thinner yarn requires a slower rotation 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 knitting jacquard characterization parameters, and the complex difference categories of each knitting sub-area are divided, so as to further adjust and determine the rotation speed of the looping mechanism according to the specific complex difference category, while effectively ensuring the integrity of the knitted fabric, the production efficiency of the circular knitting machine is further improved.

[0036] Specifically, the knitting control mechanism divides each knitting sub-area into complex difference categories based on the knitting jacquard characterization parameters, including: If the knitted jacquard characterization parameter is less than or equal to the preset knitted jacquard characterization parameter, the single knitted sub-region is classified into a weak complex difference category; If the knitted jacquard characterization parameter is greater than the preset knitted jacquard characterization parameter, the single knitted sub-region is classified into a strong complex difference category.

[0037] The preset knitting jacquard characterization parameter Z0 is selected in the interval [0.61, 0.75].

[0038] Specifically, 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: If a single knitting sub-area is of a weakly complex difference category, the loop forming mechanism is controlled to run at a predetermined speed to complete the knitting of the loop; If a single knitting sub-area is of a strong complex difference category, the rotation speed of the loop forming mechanism is determined according to the knitting jacquard characterization parameters.

[0039] Specifically, the knitting control mechanism determines the rotation speed of the loop forming mechanism according to the knitting jacquard characterization parameters, wherein: The rotation speed of the loop forming mechanism determined by the knitting control mechanism is inversely proportional to the knitting jacquard characterization parameter.

[0040] In this embodiment, optionally, The knitted jacquard characterization parameter is compared with a first preset jacquard comparison threshold and a second preset jacquard comparison threshold, If the knitting jacquard characterization parameter is less than or equal to the first preset jacquard comparison threshold, the rotation speed of the loop forming mechanism is determined to be 0.91 times the initial rotation speed; 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, the rotation speed of the loop forming mechanism is determined to be 0.83 times the initial rotation speed; If the knitted jacquard characterization parameter is greater than the second preset jacquard comparison threshold, the rotation speed of the loop forming mechanism is determined to be 0.77 times the initial rotation speed; Among them, the first preset jacquard comparison threshold is 1.3Z0, and the second preset jacquard comparison threshold is 1.45Z0.

[0041] Specifically, the knitting control mechanism acquires the yarn smoothness based on the hooking line image information, including: Yarn characteristics for obtaining hook line image information; To obtain the curve area in the yarn characteristics, the yarn characteristics include the curve area of ​​the bent part and the straight line area of ​​the straightened part; The ratio of the length corresponding to the curve area to the total length of the yarn feature in the hook line image information is used to calculate the yarn smoothness.

[0042] Specifically, the knitting control mechanism determines whether to redetermine the rotation 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, the current rotation speed is continuously used as the operating parameter of the loop forming mechanism; If the yarn smoothness is greater than the preset yarn smoothness, the rotation speed of the loop forming mechanism is re-determined based on the jacquard area ratio.

[0043] Among them, the preset yarn smoothness P0 is selected in the interval [0.98X0, 1.16X0], and X0 represents the average value of the historical yarn smoothness obtained.

[0044] Specifically, the present invention does not limit the number of historical yarn smoothness obtained, which can be freely set by those skilled in the art. It is only necessary to determine the specific operation status of knitting when monitoring the loop forming mechanism. This is the prior art and will not be repeated here.

[0045] Specifically, the present invention divides each knitting sub-area into complex difference categories based on the knitting jacquard characterization parameters. During the knitting process, for strong complex difference categories, any slight error may cause pattern dislocation or damage, and the loop forming mechanism needs 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 loop forming mechanism are adjusted in time to ensure the tightness of the fabric, thereby further improving the production efficiency of the large circular knitting machine.

[0046] Specifically, the knitting control mechanism is used to determine the correction amplitude of the rotation speed of the loop forming mechanism based on the jacquard area ratio, wherein: The correction range of the rotation speed of the loop forming mechanism determined by the knitting control mechanism is positively correlated with the jacquard area ratio.

[0047] In this embodiment, optionally, Comparing the jacquard area ratio with a first preset area comparison threshold and a second preset area comparison threshold; If the jacquard area ratio is less than or equal to the first preset area comparison threshold, the increase in the rotation speed of the loop forming mechanism is determined as the first increase, and the first increase is set to 0.24 times the current rotation speed of the loop forming mechanism; If the jacquard area ratio is less than or equal to the second preset area comparison threshold and greater than the first preset area comparison threshold, the increase in the rotation speed of the loop forming mechanism is determined as the second increase, and the second increase is set to 0.19 times the current rotation speed of the loop forming mechanism; If the jacquard area ratio is greater than the second preset area comparison threshold, the increase in the rotation speed of the loop forming mechanism is determined as the third increase, and the third increase is set to 0.12 times the current rotation speed of the loop forming mechanism; The first preset area comparison threshold is 1.13J0, the second preset area comparison threshold is 1.27J0, and J0 represents the average value of the jacquard area proportions of each historical jacquard preview image.

[0048] So far, the technical solutions of the present invention have 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 fall within the protection scope of the present invention.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A jacquard control system based on a circular knitting machine, characterized in that: include: A loop forming mechanism, which is used to weave the yarn into loops to form a knitted fabric, including a knitting needle for hooking the yarn and forming a loop; A yarn feeding mechanism, used for feeding the yarn to the loop forming mechanism; A data processing mechanism, which is connected to the yarn feeding mechanism and the loop forming mechanism respectively, and is used to determine the initial jacquard programs of the yarn feeding mechanism and the loop forming mechanism respectively based on the jacquard preview image, and respectively control the yarn feeding mechanism and the loop forming mechanism to operate according to the initial jacquard program; A monitoring mechanism, comprising a high-speed camera arranged at one side of the loop forming mechanism for obtaining thread hooking image information of the yarn being hooked by the knitting needle; A feature analysis module, which is connected to the data processing mechanism and the monitoring mechanism respectively, and is used to obtain the complex features of the jacquard in each knitted sub-area in the jacquard preview image, and calculate the knitted jacquard characterization parameters in combination with the yarn tension characteristic parameters, wherein the complex features of the jacquard include the chromaticity doping difference and the jacquard area ratio; 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 classify the complex difference categories of each knitting sub-area according to the knitting jacquard characterization parameters, and control the loop forming mechanism according to the complex difference categories, include, Determine the rotation speed of the loop forming mechanism according to the knitting jacquard characterization parameters, obtain the yarn smoothness based on the hooking line image information, and determine whether to correct the rotation speed of the loop forming mechanism according to the jacquard area ratio according to the yarn smoothness; Or, the knitting mechanism is controlled to run at a predetermined speed to complete the knitting of the loops.

2. The jacquard control system based on the circular knitting machine according to claim 1 is characterized in that: The feature analysis module is used to obtain the complex features of the jacquard in each knitting sub-area in the jacquard preview image, including: Used to convert the jacquard preview image of a single knitted sub-area into a grayscale image; Used to select each grayscale area in the grayscale image; Used to calculate the total length of each frame selection curve as the chromaticity doping difference; Used to determine the jacquard area in the jacquard preview image corresponding to a single knitting sub-area; It is used to solve the ratio of the total area of ​​each jacquard area in a single knitted sub-area to the area of ​​the knitted sub-area as the jacquard area ratio.

3. The jacquard control system based on the circular knitting machine according to claim 2 is characterized in that: The characteristic analysis module is used to obtain characteristic parameters of yarn tension, including: It is used to obtain the fineness of each yarn, and to take the average value of the calculated fineness of each yarn as the characteristic parameter of the yarn tension.

4. The jacquard control system based on the circular knitting machine according to claim 3 is characterized in that: The feature analysis module is used to obtain knitted jacquard characterization parameters, including: The ratio of the chromaticity doping difference amount to the average value of the chromaticity doping difference amount of each historical jacquard preview image is solved to obtain the doping degree characterization amount; Calculate the ratio of the jacquard area ratio to the average jacquard area ratio of each historical jacquard preview image to obtain the area ratio representation; 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 representation value; The doping degree characterization quantity, area ratio characterization quantity and tension characterization quantity are respectively assigned corresponding weight coefficients and summed up to obtain the knitting jacquard characterization parameters.

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

6. The jacquard control system based on the circular knitting machine according to claim 5, characterized in that: 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: If a single knitting sub-area is of a weakly complex difference category, the loop forming mechanism is controlled to run at a predetermined speed to complete the knitting of the loop; If a single knitted sub-area belongs to the strong complex difference category, the rotation speed of the loop forming mechanism is determined according to the knitted jacquard characterization parameters, and the yarn smoothness is obtained based on the hook line image information to determine whether to correct the rotation speed of the loop forming mechanism according to the jacquard area ratio based on the yarn smoothness.

7. The jacquard control system based on the circular knitting machine according to claim 6, characterized in that: The knitting control mechanism determines the rotation speed of the loop forming mechanism according to the knitting jacquard characterization parameters, wherein: The rotation speed of the loop forming mechanism determined by the knitting control mechanism is inversely proportional to the knitting jacquard characterization parameter.

8. The jacquard control system based on the circular knitting machine according to claim 7, characterized in that: The knitting control mechanism obtains the yarn smoothness based on the hooking line image information, including: The yarn features used to obtain the hook line image information, the yarn features include the curved area of ​​the curved part and the straight line area of ​​the straightened part; The ratio of the length corresponding to the curve area to the total length of the yarn feature in the hook line image information is used to calculate the yarn smoothness.

9. The jacquard control system based on the circular knitting machine according to claim 8, characterized in that: The knitting control mechanism determines whether to redetermine the rotation 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, the current rotation speed is continuously used as the operating parameter of the loop forming mechanism; If the yarn smoothness is greater than the preset yarn smoothness, the rotation speed of the loop forming mechanism is re-determined based on the jacquard area ratio.

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

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