A method for constructing a controllable mechanism for electric spindle spinning twist coefficient and a yarn spinning method thereof

Abstract

The present invention relates to a method for constructing a controllable mechanism for electric spindle spinning twist coefficient. Based on the fact that each working component in a ring spinning frame is controlled by each servo driver via a servo motor, and the front roller speed is the primary signal source, a controllable mechanism for electric spindle spinning twist coefficient is constructed, including that the spindle motor in each spindle position corresponds to the linear density of feeding and feeding, each spindle position outputs the twist, twist coefficient, and twist degree of the formed yarn, each spindle position corresponds to the winding speed, and the lifting and lowering of the steel collar plate; and then based on the controllable mechanism for electric spindle spinning twist coefficient, yarn spinning is further designed, including realizing electric spindle spinning with independently controllable twist coefficient, realizing stress-balanced yarn spinning that keeps the twist angle constant over the entire yarn length, realizing composite yarn spinning with optimal strength based on critical twist coefficient, realizing forming yarn with the same twist coefficient spinning based on different spindle positions, and realizing forming yarn with different twist coefficient spinning based on different spindle positions, thereby effectively improving the actual spinning efficiency of the ring spinning frame.

Description

Technical Field

[0001] The invention relates to a method for constructing a controllable twist coefficient mechanism of electric spindle spinning and a yarn spinning method thereof, and belongs to the technical field of digital electric-controlled spinning. Background Art

[0002] Spinning processes control yarn thickness through drafting, twisting and twist multiplier through twisting, and the final bobbin shape through the package structure through the forming process. Twist and twist multiplier affect yarn tightness and mechanical properties such as tensile strength, torsional stiffness, and friction resistance. Critical twist multiplier optimizes yarn mechanical properties and improves processability, making optimal twist multiplier control a crucial task in the spinning process.

[0003] Traditional ring spinning machines use a collective transmission mode in which an AC motor drives the roller, which in turn drives the spindle tape, which in turn drives the spindles through friction with the spindle tape. This mode drives all the spinning spindles in the machine to rotate and complete the twisting and winding functions. Due to the collective transmission mode in which the roller drives the spindle tape, which in turn drives the spindles through friction with the spindle tape, the following problems may occur during the spinning process:

[0004] (1) Due to the use of friction drive spinning spindles, twist cannot usually be regulated by changing the spindle rotation speed. Instead, twist is regulated by synchronously changing the linear speeds of the front, middle, and rear rollers. However, changing the linear speeds of the front, middle, and rear rollers will affect the stability of the drafting process, resulting in a decrease in yarn quality; on the other hand, it will reduce the stability of the entire machine operation, resulting in increased vibration, noise, and energy consumption.

[0005] (2) Due to the use of collective transmission spinning spindles, the entire spinning machine can only use one spindle speed for twisting. When it is necessary to process yarns of different specifications and different twists on the same spinning frame, it can only be started with an empty spindle, resulting in waste of machine space, waste of personnel and waste of energy.

[0006] (3) Since the spindles are driven by rollers, only yarns with one twist direction (Z twist or S twist) can be spun, and Z twist and S twist yarns cannot be spun at the same time;

[0007] (4) Due to the lack of free twisting function, yarns can only be spun based on twist, and yarns cannot be spun based on twist coefficient. Especially when spinning yarns of different thicknesses or slub yarns with varying thicknesses, the optimal match between twist and twist coefficient cannot be guaranteed. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a method for constructing a controllable twist coefficient mechanism for electric spindle spinning, and to design each moving component in the ring spinning machine based on servo motor control to achieve precise control of each component, thereby realizing spinning with controllable twist coefficient and improving work efficiency.

[0009] In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention designs a method for constructing a controllable mechanism for the twist coefficient of electric spindle spinning, based on the front roller, middle roller, back roller, and electronic cam corresponding to the steel ring plate in the ring spinning frame being controlled by corresponding servo drivers via corresponding servo motors, and the spindle motors in each spindle position being controlled by corresponding spindle position drivers, with the front roller speed as the primary signal source, executing the following steps A to D to realize the construction of a controllable mechanism for the twist coefficient of electric spindle spinning:

[0010] Step A. Based on the draft ratio among the front roller, the middle roller, and the back roller, the speed of the middle roller and the back roller are established with the speed of the front roller as a reference, and the linear density of the sliver fed by the spindle motors in each spindle position is linked to establish the density of the formed yarn output by the spindle motors in each spindle position;

[0011] Step B. constructing a method for independently regulating the twist, twist coefficient, and twist angle of the formed yarn corresponding to each spindle position;

[0012] Step C. Constructing a method for independently controlling the speed of the wire ring, the rotation speed of the spindle motor, and the winding speed in each spindle position;

[0013] Step D: Constructing a method for regulating the lifting speed of the steel ring plate, the total winding length when the steel ring plate is raised, and the total winding length when the steel ring plate is lowered.

[0014] The technical problem to be solved by the present invention is to provide a yarn spinning method based on a method for constructing a controllable twist coefficient mechanism of electric spindle spinning. Based on the construction of the design controllable mechanism, the twist coefficient can be controlled to achieve efficient spinning of various types of yarns.

[0015] In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention designs a yarn spinning method based on a method for constructing a controllable twist coefficient mechanism of electric spindle spinning, which is implemented as follows to realize an electric spindle spinning method with independently controllable twist coefficient;

[0016] First, the front roller speed V q As a control benchmark, the twist T corresponding to the formed yarn is output according to each spindle position. yi , construct the rotation speed n of the spindle motor in each spindle position si as follows:

[0017] n si =V q ×T yi (13)

[0018] Among them, i=1,2,...,ω,ω is the maximum serial number of the spindle position, n si is the rotation speed of the spindle motor in the i-th spindle position;

[0019] And output the number N of the formed yarn according to the preset spindle position i-tex , Each spindle outputs the twist coefficient α corresponding to the formed yarn yi , construct each spindle to output the twist T corresponding to the formed yarn yi as follows:

[0020]

[0021] Then, substitute equation (14) into equation (13) to obtain the rotation speed n of the spindle motor in each spindle position. si The twist coefficient α corresponding to the output of the formed yarn at each spindle position yi The relationship between them is as follows:

[0022]

[0023] That is, according to formula (15), during the spinning process, without changing the front roller speed V q Under the condition of , the corresponding twist coefficient α of the formed yarn is output according to the required spindle positions. yi , respectively regulate the rotation speed n of the spindle motor in each spindle position si , or according to the rotation speed n of the spindle motor in each spindle position si The changes of each spindle are regulated to output the corresponding twist coefficient α of the formed yarn yi ; That is, to realize electric spindle spinning with independently controllable twist coefficient.

[0024] In order to solve the above technical problems, the present invention adopts the following technical solutions: the present invention designs a yarn spinning method based on a method for constructing a controllable twist coefficient mechanism of electric spindle spinning, which is implemented as follows to achieve a stress-balanced yarn spinning method that maintains a constant twist angle over the entire yarn length;

[0025] Based on the thick part, base yarn part and thin part of the slub yarn, first, the front roller speed V q As the control benchmark, the thick section, base yarn section and detail section of the slub yarn are constructed to correspond to the rotation speed n of the spindle motor in each spindle position respectively. c-si 、n j-si 、n x-si as follows:

[0026]

[0027] Where i = 1, 2, ..., ω, ω is the maximum number of the spindle position, T c-yi、T j-yi 、T x-yi The thick section, base yarn section and detail section of the slub yarn correspond to the twist in each spindle position, and T c-yi <T j-yi <T x-yi ;

[0028] Then, the twist coefficient α corresponding to the thick part, base yarn part and detail part of the slub yarn is constructed. c-yi , α j-yi , α x-yi for:

[0029]

[0030] Among them, N c-i-tex 、N j-i-tex 、N x-i-tex Output the number of thick section, base yarn and thin section of slub yarn for each spindle position in turn;

[0031] And when the thick section, base yarn section and detail section of the slub yarn correspond to the twist coefficient α of each spindle position respectively c-yi , α j-yi , α x-yi are equal, that is, α c-yi =α j-yi =α x-yi =α yi , then we get the following:

[0032]

[0033] When the yarn twist coefficient α yi When is a constant value, substitute formula (18) into formula (16) to obtain the slub yarn thick section, base yarn section, and detail section, which correspond to the spindle speed n in each spindle position respectively. c-si 、n j-si 、n x-si as follows:

[0034]

[0035] That is, according to formula (19), while maintaining the front roller speed V q Under constant conditions, the number of the thick section of the slub yarn, the number of the base yarn, and the number of the thin section are output by each spindle position, and the electric spindle speed n is adjusted in turn. c-si 、n j-si 、n x-si , so that the slub yarn has a constant twist coefficient α over the entire yarn length yi as follows:

[0036]

[0037] Finally, the thick section, base yarn section, and detail section of the slub yarn are constructed to correspond to the twist angle β of each spindle position. c-yi , β j-yi , β x-yi as follows:

[0038]

[0039] And β c-yi =β j-yi =β x-yi =β yi (twenty two)

[0040] According to (22), the slub yarn obtained by spinning has a constant twist coefficient α yi , then the twist angle β of each spindle position of the slub yarn is yi Constant, that is, the spinning of stress-balanced yarn with a constant twist angle over the entire yarn length is achieved.

[0041] In order to solve the above technical problems, the present invention adopts the following technical solutions: the present invention designs a yarn spinning method based on the construction method of the controllable twist coefficient mechanism of electric spindle spinning, which is executed as follows to realize a composite yarn forming method with optimal strength based on the critical twist coefficient;

[0042] First, the ring spinning frame outputs the shaped yarn as a composite yarn, that is, the number of composite yarns output by each spindle position of the ring spinning frame is N. i-tex , constructing the critical twist coefficient α caused by the change of multi-component mixing ratio ξ-ki The changes are as follows:

[0043] α 1-ki ,α 2-ki ,...,α ξ-ki ,...,α (ε-1)-ki ,α ε-ki (twenty three)

[0044] Where i = 1, 2, ..., ω, ω is the maximum number of the spindle position, ξ = 1, 2, ..., ε, ε is the number of stages in which the multi-component mixing ratio of the preset composite yarn changes sequentially, α ξ-ki represents the critical twist coefficient of the composite yarn output from the i-th spindle at the ξ-th multi-component mixing ratio under the corresponding time sequence change of the ring spinning frame;

[0045] Then, according to the front roller speed V q , construct the critical twist coefficient α ξ-ki The corresponding electric spindle rotation speed is as follows:

[0046]

[0047] Among them, n ξ-ki It represents the rotation speed of the spindle motor corresponding to the composite yarn with the ξ-th multi-component mixing ratio and the critical twist coefficient output at the i-th spindle position under the corresponding timing changes of the ring spinning frame;

[0048] Finally, the spindle speed n under time sequence changes 1-ki ,n 2-ki ,...,n ξ-ki ,...,n (ε-1)-ki ,n ε-ki The output number of each spindle position is N i-tex The composite yarn, and then according to the time sequence change law of the multi-component mixing ratio of the composite yarn, the twist coefficient of the composite yarn that achieves corresponding changes over the entire yarn length is as follows:

[0049]

[0050] In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention designs a mechanism for achieving controllable twist coefficient based on electric spindle spinning and a spinning process for yarn with controllable twist coefficient, which is implemented as follows to realize a spinning process method for forming yarns with different counts and independently designed twist coefficients based on different spindle positions;

[0051] First, the number N of the formed yarn is output according to the preset spindle positions. i-tex All are N tex , each spindle outputs the corresponding twist coefficient of the shaped yarn is α yi are different from each other, and the draft ratio E between the front roller and the back roller is preset, the front roller speed V q To control the benchmark, construct N tex , E, and the linear density of the cotton strips fed by the spindle motor in each spindle position ρ si The relationship between them is as follows:

[0052] N tex =N i-tex =100×ρ si / E (26)

[0053] Then the rotation speed n of the spindle motor in each spindle position is obtained si As follows, and each n si They are all different from each other;

[0054]

[0055] Then, by setting the front roller speed V q , drafting multiple E, and the rotation speed n of the spindle motor in each spindle position si, spinning yarns with equal linear density and different twist coefficients at different spindle positions; where i = 1, 2, ..., ω, ω is the maximum number of the spindle position, N i-tex Output the number of the formed yarn for the preset i-th spindle position.

[0056] In order to solve the above technical problems, the present invention adopts the following technical solutions: the present invention designs a yarn spinning method based on a method for constructing a controllable twist coefficient mechanism of electric spindle spinning, which is executed as follows to achieve the spinning of shaped yarns of different counts and different twist coefficients based on different spindle positions;

[0057] First, according to the linear density of the cotton strips fed by the spindle motor in each spindle position, si They are different from each other, and the corresponding twist coefficient α of the formed yarn is outputted for each spindle position. yi are different from each other, and the draft ratio E between the front roller and the back roller is preset, the front roller speed V q To control the benchmark, construct N tex , E, and the linear density of the cotton strips fed by the spindle motor in each spindle position ρ si The relationship between them is as follows:

[0058] N i-tex =100×ρ si / E (28)

[0059] And each spindle is preset to output the number N of the formed yarn i-tex They are all different from each other;

[0060] Then the rotation speed n of the spindle motor in each spindle position is obtained si As follows, and each n si They are all different from each other;

[0061]

[0062] Then, by setting the front roller speed V q , draft multiple E, and the linear density ρ of the cotton strips fed by the spindle motor in each spindle position si They are different from each other, using different rotation speed n of the spindle motor in each spindle position si , different spindle positions are used to spin shaped yarns with different linear densities and twist coefficients; where i = 1, 2, ..., ω, ω is the maximum number of the spindle position, N i-tex Output the number of the formed yarn for the preset i-th spindle position.

[0063] The method for constructing a controllable mechanism for twist coefficient of electric spindle spinning and the yarn spinning method thereof according to the present invention have the following technical effects compared with the prior art by adopting the above technical solution:

[0064] (1) The present invention designs a method for constructing a controllable mechanism for the twist coefficient of electric spindle spinning. Based on the fact that each working part in the ring spinning frame is controlled by each servo driver via a servo motor, and the front roller speed is the primary signal source, a controllable mechanism for the twist coefficient of electric spindle spinning is constructed, including the spindle motor in each spindle position corresponding to the linear density of the feed and the feed, each spindle position outputting the twist, twist coefficient, and twist degree of the formed yarn, the winding speed corresponding to each spindle position, and the lifting and lowering of the steel collar plate; based on the controllable mechanism for the twist coefficient of electric spindle spinning, a yarn spinning method is further designed, including realizing electric spindle spinning with independently controllable twist coefficient, realizing stress-balanced yarn spinning with a constant twist angle, realizing composite yarn spinning with optimal strength based on critical twist coefficient, realizing forming yarn with the same twist coefficient based on different spindle positions, and realizing forming yarn with different twist coefficients based on different spindle positions, thereby effectively improving the actual spinning efficiency of the ring spinning frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 Schematic diagram of the electric spindle independent twisting system designed based on the ring spinning frame of the present invention;

[0066] Figure 2 This is a flow chart of the method for constructing a controllable mechanism for electric spindle spinning twist coefficient and the yarn spinning method thereof. DETAILED DESCRIPTION

[0067] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0068] The present invention designs a method for constructing a controllable mechanism for the twist coefficient of electric spindle spinning. The method is based on the fact that the front roller, middle roller, back roller and electronic cam corresponding to the steel collar plate in the ring spinning frame are controlled by corresponding servo drivers through corresponding servo motors, and the spindle motors in each spindle position are controlled by corresponding spindle position drivers, thereby realizing the construction of a controllable mechanism for the twist coefficient of electric spindle spinning.

[0069] The improved ring spinning frame here, that is, the electric spindle independent twisting system, is an electric spindle independent twisting system with two-level bus control and distributed drive constructed based on touch screen-host controller-region controller-spindle position driver in actual application. Its main feature is the use of main controller, region controller, spindle position driver, and two-level bus to realize independent control and digital precision control of each spindle twister of the electric spindle independent twisting system.

[0070] The all-electric spindle spinning system consists of a spinning control system, a spinning drive system, a spinning network information system, and a spinning mechanical system. Figure 1 shown.

[0071] (1) Spinning control system: It consists of a touch screen, a host controller, a zone controller, a photoelectric encoder, and corresponding control programs and algorithms.

[0072] (2) Spinning drive system: The drive of the drafting system is composed of servo drivers and servo motors corresponding to the front, middle and rear rollers. The drive of the electric spindle independent twisting system is composed of spindle position drivers corresponding to each spindle position. The drive of the forming system is composed of servo drivers, servo motors, electronic cams, etc. corresponding to the steel collar plate.

[0073] (3) Network information system: Through the communication and data transmission between the network subsystem and the host controller, the ANDROID system based on WiFi wireless network, Ethernet and LTE wide area network accesses the cloud platform and various terminals to realize the human-computer interaction of the electric spindle spinning machine and the interconnection with other systems.

[0074] (4) Spinning machinery system: It consists of a drafting mechanism, a twisting mechanism, a winding-forming mechanism, and various auxiliary mechanisms. The drafting mechanism consists of front, middle, and rear rollers, the twisting mechanism consists of spindles independently driven by electric spindles, and the forming mechanism consists of a steel collar.

[0075] The electric spindle independent twisting system, which is constructed by a touch screen, a host controller, a zone controller and spindle position drivers, adopts a two-level bus control mode. In the first-level bus, a host controller and N zone controllers are linked through the field bus CANOPEN, where each zone controller is called a node in the bus structure; the second-level bus is connected by a zone controller and M spindle position drivers through a custom bus, and each spindle position driver drives two independent, adjacent spindle motors.

[0076] For the above-mentioned independent electric spindle twisting system, the front roller speed measurement is used as the primary signal source. Combined with the spinning process parameters set by the user and the sampling data, the host controller calculates and obtains relevant data such as the spindle speed, the ratio of spindle speed to roller, and the ratio of spindle speed to steel ring plate. This data is then transmitted to the frequency converter and servo controller in real time via the CANOPEN fieldbus to synchronously control the spindles, rollers, steel ring plate and other equipment. At the same time, the spindle speed, front roller speed, front roller output speed and other data obtained through calculation are transmitted to the display panel and cloud platform in real time.

[0077] Based on the construction of the above-mentioned independent twisting system of electric spindles, in practical applications, the speed of the front roller is the primary signal source, such as Figure 2 As shown, the specific design executes the following steps A to D to realize the construction of a controllable mechanism for the twist coefficient of electric spindle spinning.

[0078] Step A. According to the draft ratio among the front roller, the middle roller and the back roller, the front roller speed is used as a reference to construct the middle roller speed and the back roller speed, and the sliver linear density fed by the spindle motor in each spindle position is linked to construct the formed yarn density output by the spindle motor in each spindle position.

[0079] In practical applications, the draft ratios of the front roller, middle roller, and back roller are as follows:

[0080]

[0081] Previous roller speed V q As a benchmark, construct the middle roller speed V z , rear roller speed V h as follows:

[0082]

[0083] And the linear density of the cotton strips fed by the spindle motors in each spindle position is related to ρ si , construct the spindle motor in each spindle position to output the formed yarn density ρ yi as follows:

[0084] ρ yi =ρ si / E=ρ si ×V h / V q (3)

[0085] Where i = 1, 2, ..., ω, ω is the maximum number of the spindle position, ρ si is the linear density of the cotton strips fed by the spindle motor in the i-th spindle position, ρ yi is the density of the yarn formed by the spindle motor output in the i-th spindle position, E z is the draft ratio between the middle roller and the back roller, E q is the draft ratio between the front roller and the middle roller, and E is the draft ratio between the front roller and the back roller.

[0086] Step B: Construct a method for independently regulating the twist, twist coefficient, and twist angle of the formed yarn corresponding to each spindle position. The specific application includes the following.

[0087] First, according to the twist T' added by each spindle during the spinning process yi as follows:

[0088] T' yi =n si / V q -1 / πd xi (4)

[0089] Construct each spindle to output the twist T corresponding to the formed yarnyi as follows:

[0090] T yi =n si / V q (5)

[0091] Among them, i=1,2,...,ω,ω is the maximum serial number of the spindle position, n si is the rotation speed of the spindle motor in the i-th spindle position, V q is the front roller speed, T' yi is the twist applied to the i-th spindle position, T yi The twist corresponding to the output of the shaped yarn at the i-th spindle position, d xi is the winding diameter of the bobbin in the i-th spindle position.

[0092] Then, the number N of the formed yarn is output according to the preset spindle positions. i-tex , construct each spindle to output the twist coefficient α corresponding to the formed yarn yi as follows:

[0093]

[0094] Among them, α yi N is the twist coefficient corresponding to the output of the shaped yarn at the i-th spindle position. i-tex Output the number of the formed yarn for the preset i-th spindle position.

[0095] Finally, the twist coefficient α corresponding to the formed yarn is output according to each spindle position yi , construct the twist angle β corresponding to the output of the formed yarn at each spindle position yi as follows:

[0096]

[0097] Among them, β yi is the twist angle corresponding to the output of the shaped yarn at the i-th spindle position, and δ is the fiber volume density.

[0098] Step C. Construct a method for independently controlling the wire ring speed, spindle motor rotation speed and winding speed in each spindle position. The specific design is as follows.

[0099] First, construct the traveler speed n in each spindle position ti as follows:

[0100] n ti =n si -V q / πd xi (8)

[0101] Among them, i=1,2,...,ω,ω is the maximum serial number of the spindle position, nti is the speed of the wire traveler in the i-th spindle position, n si is the rotation speed of the spindle motor in the i-th spindle position, V q is the front roller speed, d xi is the winding diameter of the bobbin in the i-th spindle position.

[0102] Then, the rotation speed n of the spindle motor in each spindle position si as follows:

[0103] n si =V q ×(T′ yi +1 / πd xi ) (9)

[0104] Among them, T' yi is the twist degree applied to the i-th spindle position.

[0105] Finally, construct the winding speed n corresponding to each spindle position wi as follows:

[0106] n wi =n si -n ti (10)

[0107] Among them, n wi is the winding speed corresponding to the i-th spindle position.

[0108] Step D. is performed as follows, specifically constructing a method for regulating the raising and lowering speed of the steel ring plate, as well as the total winding length when the steel ring plate is raised and the total winding length when the steel ring plate is lowered.

[0109] First, according to the front roller speed V q , the corresponding winding pitch of the steel collar is h, and the lifting speed of the steel collar is V h as follows:

[0110]

[0111] Among them, i=1,2,...,ω,ω is the maximum serial number of the spindle position, n wi is the winding speed corresponding to the i-th spindle position, and R is the full yarn radius corresponding to the ring plate.

[0112] Then, according to the total winding length l of the steel ring plate during the rising or falling process, the bobbin radius r0 corresponding to the steel ring plate, and the bobbin forming angle γ corresponding to the steel ring plate, the steel ring plate rising speed V is constructed. h ↑、Collar plate descending speed V h ↓As follows:

[0113]

[0114] Among them, h1 is the rising stroke of the steel collar plate, h2 is the falling stroke of the steel collar plate, V f is the winding speed of the bobbin.

[0115] Based on the above-mentioned method of taking the front roller speed as the primary signal source, the following steps A to D are performed to construct a controllable mechanism for the twist coefficient of electric spindle spinning. The twist coefficient is further controlled to specifically realize the efficient spinning of five types of yarns as follows.

[0116] (1) The following steps are performed to realize an electric spindle spinning method with independently controllable twist coefficient.

[0117] First, the front roller speed V q As a control benchmark, the twist T corresponding to the formed yarn is output according to each spindle position. yi , construct the rotation speed n of the spindle motor in each spindle position si as follows:

[0118] n si =V q ×T yi (13)

[0119] Among them, i=1,2,...,ω,ω is the maximum serial number of the spindle position, n si is the rotation speed of the spindle motor in the i-th spindle position.

[0120] And output the number N of the formed yarn according to the preset spindle position i-tex , Each spindle outputs the twist coefficient α corresponding to the formed yarn yi , construct each spindle to output the twist T corresponding to the formed yarn yi as follows:

[0121]

[0122] Then, substitute equation (14) into equation (13) to obtain the rotation speed n of the spindle motor in each spindle position. si The twist coefficient α corresponding to the output of the formed yarn at each spindle position yi The relationship between them is as follows:

[0123]

[0124] That is, according to formula (15), during the spinning process, without changing the front roller speed V q Under the condition of , the corresponding twist coefficient α of the formed yarn is output according to the required spindle positions. yi , respectively regulate the rotation speed n of the spindle motor in each spindle position si , or according to the rotation speed n of the spindle motor in each spindle position si The changes of each spindle are regulated to output the corresponding twist coefficient α of the formed yarn yi; That is, to realize electric spindle spinning with independently controllable twist coefficient.

[0125] Traditional ring spinning requires the front, middle, and rear rollers to synchronize speed changes relative to the spindles to adjust twist. Sudden speed changes in the drafting system can lead to unstable drafting, increased yarn breaks, and uneven yarn evenness. The electric spindle CNC twisting system eliminates the need to adjust the speeds of the front, middle, and rear rollers, simply adjusting the speed of each corresponding spindle. This allows for batch control of the twist coefficient of finished yarns and allows for the processing of yarns with different twist coefficients at different spindle positions. This control also ensures the smoothness of the spinning process, helping to maintain stable yarn quality and avoid increased vibration, noise, and energy consumption during machine operation.

[0126] (2) performing the following to achieve a stress-balanced yarn spinning method that maintains a constant twist angle over the entire yarn length;

[0127] The so-called stress-balanced yarn means that after twisting, the fibers inside the yarn are oriented at the same twist angle, and the twist coefficient remains constant in the length direction of the yarn. Yarn with this characteristic is called stress-balanced yarn.

[0128] When using a traditional ring spinning machine to spin slub yarn with varying linear density, since only a fixed twist can be used to spin the slub yarn, the twist angles of the internal fiber orientations are inconsistent, resulting in unbalanced internal stress in the formed yarn. Under the action of the unbalanced internal stress, the twist applied to the thick section will be transferred to the fine section, resulting in too low twist in the thick section and too high twist in the fine section, and a sharp drop in yarn strength. If an electric spindle CNC twisting method is used, the twist can be adjusted according to the changes in the density and thickness of the slub yarn while ensuring that the twist coefficient remains unchanged when spinning the thick section, fine section and base yarn of the slub yarn. Since the twist coefficient remains constant, the fibers in the yarn will be uniformly oriented according to the set twist angle and achieve internal fiber stress balance in the yarn, avoiding the transfer of twist from the thick section to the fine section after forming and deteriorating the mechanical properties of the yarn.

[0129] Based on the thick part, base yarn part and thin part of the slub yarn, first, the front roller speed V q As the control benchmark, the thick section, base yarn section and detail section of the slub yarn are constructed to correspond to the rotation speed n of the spindle motor in each spindle position respectively. c-si 、n j-si 、n x-si as follows:

[0130]

[0131] Where i = 1, 2, ..., ω, ω is the maximum number of the spindle position, T c-yi 、T j-yi 、T x-yiThe thick section, base yarn section and detail section of the slub yarn correspond to the twist in each spindle position, and T c-yi <T j-yi <T x-yi .

[0132] Then, the twist coefficient α corresponding to the thick part, base yarn part and detail part of the slub yarn is constructed. c-yi , α j-yi , α x-yi for:

[0133]

[0134] Among them, N c-i-tex 、N j-i-tex 、N x-i-tex The number of the thick section, the number of the base yarn and the number of the thin section in the slub yarn are output to each spindle position in turn.

[0135] And when the thick section, base yarn section and detail section of the slub yarn correspond to the twist coefficient α of each spindle position respectively c-yi , α j-yi , α x-yi are equal, that is, α c-yi =α j-yi =α x-yi =α yi , then we get the following:

[0136]

[0137] When the yarn twist coefficient α yi When is a constant value, substitute formula (18) into formula (16) to obtain the slub yarn thick section, base yarn section, and detail section, which correspond to the spindle speed n in each spindle position respectively. c-si 、n j-si 、n x-si as follows:

[0138]

[0139] That is, according to formula (19), while maintaining the front roller speed V q Under constant conditions, the number of the thick section of the slub yarn, the number of the base yarn, and the number of the thin section are output by each spindle position, and the electric spindle speed n is adjusted in turn. c-si 、n j-si 、n x-si , so that the slub yarn obtained by spinning has a constant twist coefficient α over the entire length of the yarn yi as follows:

[0140]

[0141] Finally, the thick section, base yarn section, and detail section of the slub yarn are constructed to correspond to the twist angle β of each spindle position. c-yi , β j-yi , β x-yi as follows:

[0142]

[0143] And β c-yi =β j-yi =β x-yi =β yi (twenty two)

[0144] According to (22), the slub yarn obtained by spinning has a constant twist coefficient α yi , then the twist angle β of each spindle position of the slub yarn is yi Constant, that is, the spinning of stress-balanced yarn with a constant twist angle is achieved over the entire yarn length.

[0145] Therefore, when spinning the thick sections, base yarn and thin parts of the slub yarn, as long as the twist coefficient of the thick sections, base yarn and thin parts is kept constant throughout the entire length of the yarn, the twist angle of the thick sections, base yarn and thin parts can be guaranteed to be constant, and a slub yarn with varying thickness but balanced internal stress and constant twist coefficient can be obtained.

[0146] (3) The following is performed to realize a composite yarn forming method with optimal spinning strength based on a critical twist coefficient.

[0147] Assume the number of the composite yarn is N tex , the so-called critical twist coefficient α ki It means that under a certain mixing ratio, when the twist of the composite yarn increases, its strength, elongation at break and wear resistance gradually increase. When the twist of the composite yarn increases, its strength, elongation at break and wear resistance gradually increase. When the twist of the composite yarn continues to increase, its strength, elongation at break and wear resistance decrease instead. The twist coefficient corresponding to the transition point of its mechanical properties is called the critical twist coefficient α. ki Generally, when the multi-component mixing ratio of the composite yarn changes sequentially, its critical twist coefficient α ki Timing changes also occur.

[0148] First, the ring spinning frame outputs the shaped yarn as a composite yarn, that is, the number of composite yarns output by each spindle position of the ring spinning frame is N. i-tex , constructing the critical twist coefficient α caused by the change of multi-component mixing ratio ξ-ki The changes are as follows:

[0149] α 1-ki ,α 2-ki ,...,α ξ-ki ,...,α (ε-1)-ki ,αε-ki (twenty three)

[0150] Where i = 1, 2, ..., ω, ω is the maximum number of the spindle position, ξ = 1, 2, ..., ε, ε is the number of stages in which the multi-component mixing ratio of the preset composite yarn changes sequentially, α ξ-ki It represents the critical twist coefficient of the composite yarn output from the i-th spindle position under the corresponding timing changes of the ring spinning frame with the ξ-th multi-component mixing ratio.

[0151] Then, according to the front roller speed V q , construct the critical twist coefficient α ξ-ki The corresponding electric spindle rotation speed is as follows:

[0152]

[0153] Among them, n ξ-ki It represents the rotation speed of the spindle motor corresponding to the composite yarn with the ξth multi-component mixing ratio and the critical twist coefficient output at the i-th spindle position under the corresponding timing changes of the ring spinning frame.

[0154] Finally, the spindle speed n under time sequence changes 1-ki ,n 2-ki ,...,n ξ-ki ,...,n (ε-1)-ki ,n ε-ki The output number of each spindle position is N i-tex The composite yarn, and then according to the time sequence change law of the multi-component mixing ratio of the composite yarn, the twist coefficient of the composite yarn that achieves corresponding changes over the entire yarn length is as follows:

[0155]

[0156] (4) The following is performed to realize a process method for spinning shaped yarns of the same count and different twist coefficients based on different spindle positions.

[0157] First, the number N of the formed yarn is output according to the preset spindle positions. i-tex All are N tex , each spindle outputs the corresponding twist coefficient of the shaped yarn is α yi are different from each other, and the draft ratio E between the front roller and the back roller is preset, the front roller speed V q To control the benchmark, construct N tex , E, and the linear density of the cotton strips fed by the spindle motor in each spindle position ρ si The relationship between them is as follows:

[0158] N tex =N i-tex =100×ρ si / E (26)

[0159] Then the rotation speed n of the spindle motor in each spindle position is obtained si As follows, and each n si They are all different from each other;

[0160]

[0161] Then, by setting the front roller speed V q , drafting multiple E, and the rotation speed n of the spindle motor in each spindle position si , spinning yarns with equal linear density and different twist coefficients at different spindle positions; where i = 1, 2, ..., ω, ω is the maximum number of the spindle position, N i-tex Output the number of the formed yarn for the preset i-th spindle position.

[0162] (5) The following steps are performed to realize the spinning of shaped yarns with different counts and different twist coefficients based on different spindle positions.

[0163] First, according to the linear density of the cotton strips fed by the spindle motor in each spindle position, si They are different from each other, and the corresponding twist coefficient α of the formed yarn is outputted for each spindle position. yi are different from each other, and the draft ratio E between the front roller and the back roller is preset, the front roller speed V q To control the benchmark, construct N tex , E, and the linear density of the cotton strips fed by the spindle motor in each spindle position ρ si The relationship between them is as follows:

[0164] N i-tex =100×ρ si / E (28)

[0165] And each spindle is preset to output the number N of the formed yarn i-tex They are all different from each other.

[0166] Then the rotation speed n of the spindle motor in each spindle position is obtained si As follows, and each n si They are all different from each other;

[0167]

[0168] Then, by setting the front roller speed V q , draft multiple E, and the linear density ρ of the cotton strips fed by the spindle motor in each spindle position si They are different from each other, using different rotation speed n of the spindle motor in each spindle position si , different spindle positions are used to spin shaped yarns with different linear densities and twist coefficients; where i = 1, 2, ..., ω, ω is the maximum number of the spindle position, Ni-tex Output the number of the formed yarn for the preset i-th spindle position.

[0169] The above design scheme is applied in practice, and the embodiments are as follows.

[0170] 1. Spinning example of stress-balanced yarn with constant twist angle

[0171] Assume the front roller linear speed V q =32m / min, the roving weight is 4.5g / 10m, the linear density of slub yarn base yarn, thick section and thin section are N respectively. j-tex =10tex,N c-tex =36tex,N x-tex =18.5, the twist coefficients of base yarn, thick place and thin place are equal and α c-yi =α j-yi =α x-yi =340, calculate the spindle speed when spinning the base yarn, thick places and thin places of the slub yarn and the twist angle of the corresponding base yarn, thick places and thin places of the formed yarn.

[0172] (1) Calculate the corresponding spindle speed based on the twist coefficient:

[0173] Assume that the yarn twist coefficient α c-yi =α j-yi =α x-yi =340 is a constant value over the entire length of the yarn. The spindle speeds corresponding to the thick section, base yarn and thin section of the slub yarn are as follows:

[0174]

[0175] (2) Calculate the corresponding twist angle based on the twist coefficient

[0176] Assume that the twist coefficient α of the thick section, base yarn and thin section of the slub yarn is c-yi ,α j-yi ,α x-yi The corresponding twist angles are β c-yi ,β j-yi ,β x-yi , the volume density of pure cotton fiber δ=1.54g / cm 3 , then the corresponding twist angle is:

[0177]

[0178] The linear density of base yarn, thick place and thin place are N respectively. j-tex =10tex,N c-tex =36tex,N x-tex = 18.5 slub yarn, by adjusting the twisting speed of the electric spindle to keep the twist coefficient of each part constant, that is, α c-yi =α j-yi=α x-yi =340, so the twist angle of the fibers in each section of the yarn remains constant, that is, β c-yi =β j-yi =β x-yi =8.73°, resulting in a yarn with balanced internal stress over the entire yarn length.

[0179] 2. Example of spinning a composite yarn with optimal strength based on critical twist coefficient

[0180] When the multi-component mixing ratio of the composite yarn changes sequentially, its critical twist coefficient α ki Timing changes also occur.

[0181] Assume the front roller linear speed V q =38m / min, roving weight 4.5g / 10m, composite yarn number N tex =36tex, the critical twist coefficient of the composite yarn is α 1-ki =310,α 2-ki =330,α 3-ki =350,α 4-ki =320, find the critical twist coefficient α ξ-ki The corresponding spindle rotation speed n 1-ki ,n 2-ki ,n 3-ki n 4-ki .

[0182] The rotation speed of the electric spindle and each critical twist coefficient α ξ-ki The corresponding relationship is:

[0183]

[0184] From this we can see that when n 1-ki =1963.33rpm; n 2-ki =2090rpm; n 3-ki =2153.33rpm; n 4-ki =2216.67rpm, the time sequence of the spindle is driven, and the critical twist coefficient of each section of the composite yarn along the entire yarn length is adjusted according to α 1-ki =310,α 2-ki =330,α 3-ki =350,α 4-ki =320 timing changes.

[0185] 3. Example of spinning yarns of different counts and twists based on different spindle positions

[0186] Assume that the ring spinning machine has independent electric spindles i = 1, 2, 3, and the linear density of each cotton strip fed by the rear roller is ρ si And ρ s1 ≠ρs2 ≠ρ s3 , the linear density of the yarn spun by each spindle is: ρ y1 ,ρ y2 ,ρ y3 , the corresponding twist is: T'1, T'2, T'3, the front roller speed is known to be V q , the draft ratio is E, then the linear density of the yarn spun at each spindle is equal but the twist is different. The details are as follows:

[0187] Assume the front roller linear speed V q =36m / min, three different roving weights are 3g / 10m, 4g / 10m, 5g / 10m, the total draft multiple is E=28.4, the following three yarns are spun with yarn counts of 12.5tex, 24.5tex, and 38.5tex, and the twist coefficients are 420, 360, and 320 respectively. Find the corresponding spindle rotation speed n s1 ,n s2 ,n s3 .

[0188] Ingot rotation speed:

[0189]

[0190] From this we can see that when n s1 =42765.8rpm; n s2 =26183.2rpm; n s3 =18566.2rpm driving different electric spindles, the yarns of three different specifications and structures with twist coefficients of 420, 360, and 320 and linear densities of 12.5tex, 24.5tex, and 38.5tex can be spun respectively.

[0191] 4. Example of spinning yarns of the same count and different twists based on different spindle positions

[0192] Assume that the ring spinning machine has independent electric spindles i = 1, 2, 3, and the linear density of each cotton strip fed by the back roller is ρ si , and: s1 =ρ s2 =ρ s3 , the linear density of the yarn spun by each spindle is: ρ y1 ,ρ y2 ,ρ y3 , the corresponding twist is: T1', T2', T3', it is known that the front roller speed is and the drafting ratio is E, then the linear density of the yarn spun at each spindle position is equal and the twist is different. The details are as follows:

[0193]

[0194] Assume the front roller linear speed V q=42m / min, the roving weight is 4.8g / 10m, the yarn number is 24.6tex, and the twist coefficients are 420, 360, and 320 respectively. Find the corresponding spindle rotation speed n s1 ,n s2 ,n s3 The rotation speed of the electric spindle is calculated as follows:

[0195]

[0196] From this we can see that when n s1 =35565.7rpm; n s2 =30484.9rpm; n s3 =27097.7rpm drives different electric spindles, and can spin three different specifications and structures of yarns with twist coefficients of 420, 360, and 320 and linear densities of 12.5tex, 24.5tex, and 38.5tex respectively.

[0197] The above design scheme is based on the fact that each working part in the ring spinning frame is controlled by each servo driver via a servo motor, with the front roller speed as the primary signal source, to construct a controllable mechanism for the twist coefficient of electric spindle spinning, including the linear density of the feed and feed corresponding to the spindle motor in each spindle position, the twist, twist coefficient and twist degree of the formed yarn output by each spindle position, the winding speed corresponding to each spindle position, and the lifting and lowering of the steel collar plate; based on the controllable mechanism of the twist coefficient of electric spindle spinning, the yarn spinning method is further designed, including electric spindle spinning with independently controllable twist coefficient, stress-balanced yarn spinning that maintains a constant twist angle over the entire length of the yarn, composite yarn with optimal strength based on the critical twist coefficient, yarn with the same twist coefficient spinning based on different spindle positions, and yarn with different twist coefficient spinning based on different spindle positions, which effectively improves the actual spinning efficiency of the ring spinning frame.

[0198] Furthermore, in specific product applications, the limitations and bottlenecks of ring spinning forming technology are broken through. The traditional spindle-belt friction collective drive spindle technology is replaced by independently driven electric spindle technology. Based on the control and drive system of touch screen-main controller-local controller-spindle position driver, a secondary bus control and distributed electric spindle drive mode are constructed. Each twisting spindle is independently driven and digitally driven to achieve twisting freedom. The use of CNC electric spindle twisting technology can spin yarns with different twists but constant twist coefficients at the same spindle position, and can also spin yarns with different twists or even different twist directions (Z twist or S twist) at different spindle positions, thereby improving spinning efficiency.

[0199] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the spirit of the present invention.

Claims

1. A method for constructing a controllable twist coefficient mechanism for electric spindle spinning, characterized in that: Based on the fact that the front roller, middle roller, back roller and the electronic cam corresponding to the ring plate in the ring spinning frame are controlled by corresponding servo drivers through corresponding servo motors, and the spindle motors in each spindle position are controlled by corresponding spindle position drivers, the front roller speed is used as the primary signal source, and the following steps A to D are performed to realize the construction of the controllable twist coefficient mechanism of electric spindle spinning: Step A. Based on the draft ratio among the front roller, the middle roller, and the back roller, the speed of the middle roller and the back roller are established with the speed of the front roller as a reference, and the linear density of the sliver fed by the spindle motors in each spindle position is linked to establish the density of the formed yarn output by the spindle motors in each spindle position; Step B. constructing a method for independently regulating the twist, twist coefficient, and twist angle of the formed yarn corresponding to each spindle position; Step C. Constructing a method for independently controlling the speed of the wire ring, the rotation speed of the spindle motor, and the winding speed in each spindle position; Step D. Constructing a method for regulating the raising and lowering speed of the steel collar, as well as the total winding length when the steel collar is raised and the total winding length when the steel collar is lowered; In the above step A, the draft ratios among the front roller, middle roller, and back roller are as follows: Previous roller speed V q As a benchmark, construct the middle roller speed V z , rear roller speed V h as follows: And the linear density of the cotton strips fed by the spindle motors in each spindle position is related to ρ si , construct the spindle motor in each spindle position to output the formed yarn density ρ yi as follows: r yi =ρ si / E=ρ si ×V h / V q (3) Where i = 1, 2, ..., ω, ω is the maximum number of the spindle position, ρ si is the linear density of the cotton strips fed by the spindle motor in the i-th spindle position, ρ yi is the density of the yarn formed by the spindle motor output in the i-th spindle position, E z is the draft ratio between the middle roller and the back roller, E q is the draft ratio between the front roller and the middle roller, and E is the draft ratio between the front roller and the back roller.

2. The method for constructing a controllable twist coefficient mechanism for electric spindle spinning according to claim 1, characterized in that: In the step B, first, according to the twist T' of each spindle during the spinning process, yi as follows: T' yi =n si / V q -1 / πd xi (4) Construct each spindle to output the twist T corresponding to the formed yarn yi as follows: T yi =n si / V q (5) Among them, i=1,2,...,ω,ω is the maximum serial number of the spindle position, n si is the rotation speed of the spindle motor in the i-th spindle position, V q is the front roller speed, T' yi is the twist applied to the i-th spindle position, T yi The twist corresponding to the output of the shaped yarn at the i-th spindle position, d xi is the winding diameter of the bobbin in the i-th spindle position; Then, the number N of the formed yarn is output according to the preset spindle positions. i-tex , construct each spindle to output the twist coefficient α corresponding to the formed yarn yi as follows: Among them, α yi N is the twist coefficient corresponding to the output of the shaped yarn at the i-th spindle position. i-tex Output the number of the formed yarn for the preset i-th spindle position; Finally, the twist coefficient α corresponding to the formed yarn is output according to each spindle position yi , construct the twist angle β corresponding to the output of the formed yarn at each spindle position yi as follows: Among them, β yi is the twist angle corresponding to the output of the shaped yarn at the i-th spindle position, and δ is the fiber volume density.

3. The method for constructing a controllable twist coefficient mechanism for electric spindle spinning according to claim 1, characterized in that: In step C, first, the speed n of the wire ring in each spindle position is constructed. ti as follows: n ti =n si -V q / πd xi (8) Among them, i=1,2,...,ω,ω is the maximum serial number of the spindle position, n ti is the speed of the wire traveler in the i-th spindle position, n si is the rotation speed of the spindle motor in the i-th spindle position, V q is the front roller speed, d xi is the winding diameter of the bobbin in the i-th spindle position; Then, the rotation speed n of the spindle motor in each spindle position si as follows: n si =V q ×(T’ yi +1 / πd xi ) (9) Among them, T' yi is the twist applied to the i-th spindle; Finally, construct the winding speed n corresponding to each spindle position wi as follows: n wi =n si -n ti (10) Among them, n wi is the winding speed corresponding to the i-th spindle position.

4. The method for constructing a controllable twist coefficient mechanism for electric spindle spinning according to claim 1, characterized in that: In the step D, first, according to the front roller speed V q , the corresponding winding pitch of the steel collar is h, and the lifting speed of the steel collar is V h as follows: Among them, i=1,2,...,ω,ω is the maximum serial number of the spindle position, n wi is the winding speed corresponding to the i-th spindle position, and R is the full yarn radius corresponding to the ring plate; Then, according to the total winding length l of the steel ring plate during the rising or falling process, the bobbin radius r0 corresponding to the steel ring plate, and the bobbin forming angle γ corresponding to the steel ring plate, the steel ring plate rising speed V is constructed. h ↑、Collar plate descending speed V h ↓As follows: Among them, h1 is the rising stroke of the steel collar plate, h2 is the falling stroke of the steel collar plate, V f is the winding speed of the bobbin.

5. A yarn spinning method based on the method for constructing a controllable mechanism for electric spindle spinning twist coefficient according to any one of claims 1 to 4, characterized in that: The following steps are performed to realize an electric spindle spinning method with independently controllable twist coefficient; First, the front roller speed V q As a control benchmark, the twist T corresponding to the formed yarn is output according to each spindle position. yi , construct the rotation speed n of the spindle motor in each spindle position si as follows: n si =V q ×T yi (13) Among them, i=1,2,...,ω,ω is the maximum serial number of the spindle position, n si is the rotation speed of the spindle motor in the i-th spindle position; And output the number N of the formed yarn according to the preset spindle position i-tex , Each spindle outputs the twist coefficient α corresponding to the formed yarn yi , construct each spindle to output the twist T corresponding to the formed yarn yi as follows: Then, substitute equation (14) into equation (13) to obtain the rotation speed n of the spindle motor in each spindle position. si The twist coefficient α corresponding to the output of the formed yarn at each spindle position yi The relationship between them is as follows: That is, according to formula (15), during the spinning process, without changing the front roller speed V q Under the condition of , the corresponding twist coefficient α of the formed yarn is output according to the required spindle positions. yi , respectively regulate the rotation speed n of the spindle motor in each spindle position si , or according to the rotation speed n of the spindle motor in each spindle position si The changes of each spindle are regulated to output the corresponding twist coefficient α of the formed yarn yi ; That is, to realize electric spindle spinning with independently controllable twist coefficient.

6. A yarn spinning method based on the method for constructing a controllable mechanism for electric spindle spinning twist coefficient according to any one of claims 1 to 4, characterized in that: A method for spinning stress-balanced yarn with a constant twist angle over the entire yarn length is achieved by performing the following steps: Based on the thick part, base yarn part and thin part of the slub yarn, first, the front roller speed V q As the control benchmark, the thick section, base yarn section and detail section of the slub yarn are constructed to correspond to the rotation speed n of the spindle motor in each spindle position respectively. c-si 、n j-si 、n x-si as follows: Where i = 1, 2, ..., ω, ω is the maximum number of the spindle position, T c-yi 、T j-yi 、T x-yi The thick section, base yarn section and detail section of the slub yarn correspond to the twist in each spindle position, and T c-yi <T j-yi <T x-yi ; Then, the twist coefficient α corresponding to the thick part, base yarn part and detail part of the slub yarn is constructed. c-yi , α j-yi , α x-yi for: Among them, N c-i-tex 、N j-i-tex 、N x-i-tex Output the number of thick section, base yarn and thin section of slub yarn for each spindle position in turn; And when the thick section, base yarn section and detail section of the slub yarn correspond to the twist coefficient α of each spindle position respectively c-yi , α j-yi , α x-yi are equal, that is, α c-yi =α j-yi =α x-yi =α yi , then we get the following: When the yarn twist coefficient α yi When is a constant value, substitute formula (18) into formula (16) to obtain the slub yarn thick section, base yarn section, and detail section, which correspond to the spindle speed n in each spindle position respectively. c-si 、n j-si 、n x-si as follows: That is, according to formula (19), while maintaining the front roller speed V q Under constant conditions, the number of the thick section of the slub yarn, the number of the base yarn, and the number of the thin section are output by each spindle position, and the electric spindle speed n is adjusted in turn. c-si 、n j-si 、n x-si , so that the slub yarn has a constant twist coefficient α over the entire yarn length yi as follows: Finally, the thick section, base yarn section, and detail section of the slub yarn are constructed to correspond to the twist angle β of each spindle position. c-yi , β j-yi , β x-yi as follows: And β c-yi =β j-yi =β x-yi =β yi (22) According to (22), the slub yarn obtained by spinning has a constant twist coefficient α yi , then the twist angle β of each spindle position of the slub yarn is yi Constant, that is, the spinning of stress-balanced yarn with a constant twist angle over the entire yarn length is achieved.

7. A yarn spinning method based on the method for constructing a controllable mechanism for electric spindle spinning twist coefficient according to any one of claims 1 to 4, characterized in that: The method for forming a composite yarn with optimal spinning strength based on a critical twist coefficient is implemented as follows; First, the ring spinning frame outputs the shaped yarn as a composite yarn, that is, the number of composite yarns output by each spindle position of the ring spinning frame is N. i-tex , constructing the critical twist coefficient α caused by the change of multi-component mixing ratio ξ-ki The changes are as follows: α 1-ki ,α 2-ki ,...,α ξ-ki ,...,α (ε-1)-ki ,α ε-ki (23) Where i = 1, 2, ..., ω, ω is the maximum number of spindle positions, ξ = 1, 2, ..., ε, ε is the number of stages in which the multi-component mixing ratio of the preset composite yarn changes sequentially, α ξ-ki represents the critical twist coefficient of the composite yarn output from the i-th spindle at the ξ-th multi-component mixing ratio under the corresponding time sequence change of the ring spinning frame; Then, according to the front roller speed V q , construct the critical twist coefficient α ξ-ki The corresponding electric spindle rotation speed is as follows: Among them, n ξ-ki It represents the rotation speed of the spindle motor corresponding to the composite yarn with the ξ-th multi-component mixing ratio and the critical twist coefficient output at the i-th spindle position under the corresponding timing changes of the ring spinning frame; Finally, the spindle speed n under time sequence changes 1-ki ,n 2-ki ,...,n ξ-ki ,...,n (ε-1)-ki ,n ε-ki The output number of each spindle position is N i-tex The composite yarn, and then according to the time sequence change law of the multi-component mixing ratio of the composite yarn, the twist coefficient of the composite yarn that achieves corresponding changes over the entire yarn length is as follows:

8. A yarn spinning method based on the method for constructing a controllable mechanism for electric spindle spinning twist coefficient according to any one of claims 1 to 4, characterized in that: The following steps are performed to realize a process for spinning shaped yarns of the same count and different twist coefficients based on different spindle positions; First, the number N of the formed yarn is output according to the preset spindle positions. i-tex All are N tex , each spindle outputs the corresponding twist coefficient of the shaped yarn is α yi are different from each other, and the draft ratio E between the front roller and the back roller is preset, the front roller speed V q To control the benchmark, construct N tex , E, and the linear density of the cotton strips fed by the spindle motor in each spindle position ρ si The relationship between them is as follows: N tex =N i-tex =100×ρ si / E (26) Then the rotation speed n of the spindle motor in each spindle position is obtained si As follows, and each n si They are all different from each other; Then, by setting the front roller speed V q , drafting multiple E, and the rotation speed n of the spindle motor in each spindle position si , spinning yarns with equal linear density and different twist coefficients at different spindle positions; where i = 1, 2, ..., ω, ω is the maximum number of the spindle position, N i-tex Output the number of the formed yarn for the preset i-th spindle position.

9. A yarn spinning method based on the method for constructing a controllable mechanism for electric spindle spinning twist coefficient according to any one of claims 1 to 4, characterized in that: The following steps are performed to realize the spinning of shaped yarns of different counts and different twist coefficients based on different spindle positions; First, according to the linear density of the cotton strips fed by the spindle motor in each spindle position, si They are different from each other, and the corresponding twist coefficient α of the formed yarn is outputted for each spindle position. yi are different from each other, and the draft ratio E between the front roller and the back roller is preset, the front roller speed V q To control the benchmark, construct N tex , E, and the linear density of the cotton strips fed by the spindle motor in each spindle position ρ si The relationship between them is as follows: N i-tex =100×ρ si / E (28) And each spindle is preset to output the number N of the formed yarn i-tex They are all different from each other; Then the rotation speed n of the spindle motor in each spindle position is obtained si As follows, and each n si They are all different from each other; Then, by setting the front roller speed V q , draft multiple E, and the linear density ρ of the cotton strips fed by the spindle motor in each spindle position si They are different from each other, using different rotation speed n of the spindle motor in each spindle position si , different spindle positions are used to spin shaped yarns with different linear densities and twist coefficients; where i = 1, 2, ..., ω, ω is the maximum number of the spindle position, N i-tex Output the number of the formed yarn for the preset i-th spindle position.

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