CN114351301A - Self-adjusting and leveling method based on stable fiber motion state in drafting zone - Google Patents
Self-adjusting and leveling method based on stable fiber motion state in drafting zone Download PDFInfo
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- CN114351301A CN114351301A CN202111550362.4A CN202111550362A CN114351301A CN 114351301 A CN114351301 A CN 114351301A CN 202111550362 A CN202111550362 A CN 202111550362A CN 114351301 A CN114351301 A CN 114351301A
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
- D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
- D01H5/32—Regulating or varying draft
- D01H5/38—Regulating or varying draft in response to irregularities in material ; Measuring irregularities
Abstract
The invention relates to a self-adjusting and leveling method based on stable fiber motion state in a drafting zone, wherein fibers in the drafting zone are divided into rear fibers, slow floating fibers, fast floating fibers and front fibers, the distribution of the rear fibers in the drafting zone is obtained through statistics of a discrete drafting model, and the speed of the slow floating fibers in the discrete drafting model is assumed to be consistent with the speed of a rear roller all the time, and the self-adjusting and leveling method is that the speed of the slow floating fibers in the discrete drafting model is T1(t) adjusting the speed of the rear roller to V2(T) at T2And (t) adjusting the speed of the back roller to the original speed. The invention adjusts the speed of the back roller to stabilize the motion state of various fibers in the drafting zone when the input uneven part of fibers move in a slow floating fiber state, and eliminates the influence of the fluctuation of the number of input fibers on the motion state stability of the fibers in the drafting zone. And the optimal variable speed starting and ending time of the back roller is calculated by utilizing the input uneven length, so that the fibers in uneven parts can be evened, and the fibers in other parts cannot be influenced.
Description
Technical Field
The invention belongs to the technical field of spinning, and relates to a self-adjusting and leveling method based on stable fiber motion state in a drafting zone.
Background
The auto-leveling is a mode of adjusting uneven evenness of output strips by changing the drafting multiple by adjusting the speed of a roller when the number of fibers of input strands changes in the drafting process.
The traditional leveling method maintains the stability of the linear density of the output strands by detecting the change of the linear density of the input strands and adjusting the speed of a front roller or a rear roller to change the drafting multiple. However, the traditional leveling method is only a static proportional model, the fibers in the drafting zone are regarded as a whole, and four processes of rear fibers, slow floating fibers, fast floating fibers and front fibers are ignored. Therefore, the model has the following two obvious problems:
(1) the model only considers the influence of the size of the input unevenness on the drafting process and neglects the influence of the length of the input unevenness on the auto-leveling. Therefore, when the speed of the self-leveling roller is calculated, the inaccuracy of the speed calculation can be caused by neglecting the length of the input unevenness, the proportion of the self-leveling is too large or too small, and the leveling effect is not ideal.
(2) The model ignores the influence of the speed of the adjusting roller on the motion state of the fiber in the drafting zone and the stability of the output strands. In the process of auto-leveling, the uneven part of fiber and the uneven part of fiber exist in the drafting zone in different motion states at the same time, if the time for the roller to start and end speed change is not proper, the leveling effect cannot be achieved, but the stability of the motion state of the uneven part of fiber is influenced, so that the density of output strands is more unstable.
In addition, the prior art also discloses a self-adjusting method based on fiber distribution balance in a drafting zone (patent application number is CN201710328644.7), which is to establish a drafting model through a discrete theory and count the number and distribution of three types of fibers, namely rear fibers, front fibers and floating fibers, in the drafting zone. On the premise of ensuring that the number of floating fibers is not changed, the speeds of the front roller and the rear roller are simultaneously adjusted, the distribution forms of the front fibers and the rear fibers are changed, and the self-leveling is realized by the distribution of various fibers in the balanced draft zone, but the method has the following problems:
(1) the method divides the fiber in the drafting zone into three types of front fiber, rear fiber and floating fiber, and ignores the difference between the floating fibers. The floating fibers can be classified into slow floating fibers moving at the speed of the rear roller and fast floating fibers moving at the speed of the front roller according to the difference of the running speeds. The influence of the total number of the floating fibers is simply considered, but the influence of the distribution change of the fast and slow floating fibers is neglected, and finally the uncontrollable fiber distribution before the formation influences the self-leveling effect.
(2) When the number of the fibers held by the back roller changes, the fast floating fibers and the front fibers existing in the drafting zone are not affected, and the speed of the front roller is adjusted at the moment, so that the normal drafting process is affected, and uneven output is increased. Meanwhile, the change of the speed of the back roller can not influence the distribution of the back fibers, but influences the motion state of the slow floating fibers, so that the self-leveling effect is not ideal.
Therefore, it is very important to develop a method for more accurately and effectively realizing the auto-leveling.
Disclosure of Invention
The invention aims to overcome the defects of the existing leveling mode and provide a self-leveling method based on the stable fiber motion state in a drafting zone. The method comprises the following steps: the fiber drafting system is divided into four types, namely front fiber, slow floating fiber, fast floating fiber and rear fiber according to the movement speed of the fiber in the drafting zone and the control degree of a roller. The slow floating fiber is the fiber which moves at the speed of the back roller but is not controlled by the roller, and the fast floating fiber is the fiber which moves at the speed of the front roller but is not controlled by the roller. The invention adopts the length of input unevenness (namely the fiber number in the section of the fiber strand changes) and the fiber number in the section of the input fiber strand, which are detected by an input fiber strand density detection device in front of a drafting device, adjusts the speed of a rear roller when the fiber of the input unevenness moves in a slow floating fiber state, and restores the original roller speed after the fiber of the part is changed into fast floating fiber. The purpose of stable linear density of output strands is achieved by a method for maintaining the stable running state of various fibers in the drafting zone.
In order to achieve the purpose, the invention adopts the following scheme:
a self-adjusting method of fiber strands based on stable fiber motion state in a drafting zone is provided, the fiber strands refer to an aggregate formed by arranging fibers according to a certain rule, and the fiber strands include but are not limited to slivers or rovings; the fiber in the drafting zone is divided into rear fiber, slow floating fiber, fast floating fiber and front fiber, the distribution of the rear fiber in the drafting zone is obtained through statistics of a discrete drafting model, the speed of the slow floating fiber in the discrete drafting model is assumed to be consistent with the speed of a rear roller all the time, the self-adjusting method is that strands enter the drafting zone, drafting is carried out at a certain rear roller speed, an original drafting multiple and a certain front roller speed, and after unevenness reaches the drafting zone, drafting is carried out at T1(t) adjusting the speed of the rear roller to V2(T) at T2At time (t), the speed of the back roller is adjusted to the original speed (the original speed is the speed of the back roller when the input strands are uniform, namely
) (ii) a Wherein, V1Is the front roller speed, and the unit is mm/s; e0Is the original drafting multiple;
the T is1The calculation method of (t) is as follows:
wherein t is the moment when the unevenness reaches the drafting zone, and the unit is s; l2The average distance of the roller jaw after the average speed change point of the fiber is the unit of mm; v2(t-1) the speed of the back roller at the time (t-1) (if the speed of the back roller is not adjusted at the time (t-1), the speed is the original speed, and if the time (t-1) is the corresponding previous section of unevenness, the speed is the adjusted speed of the back roller corresponding to the previous section of unevenness), and the unit is mm/s;
the V is2The calculation method of (t) is as follows:
ΔM2(t)＝M2(t)-M2(t-1)；
wherein M is2(t-1) is the number of the rear fibers in the drafting zone at the moment (t-1), and the unit is root; l1The length of the whole uneven fiber strand is input for the time t (the length of the input unevenness directly affects M2(t) change in value), in mm; l is the average length of all fibres in the input strand (calculation methods are well known) in mm; m2(t) is the number of the rear fibers in the drafting zone at the time t, and the unit is root; Δ M2(t) is the fluctuation value of the number of the rear fibers in the drafting zone at the moment t; v1Is the front roller speed, and the unit is mm/s; e0The original draft multiple (the original draft multiple refers to the draft multiple when the input strands are uniform);
the T is2The calculation method of (t) is as follows:
wherein l1Inputting uneven length for time t, wherein the unit is mm; v2(t) is the speed after the back roller adjustment, and the unit is mm/s;
the number M of rear fibers in the drafting zone at the time t2(t) the number M of rear fibers in the draft zone at the time (t-1)2(t-1) inputting the length l of the whole uneven fiber strand at the time t1And the average length l of all fibres in the input sliver satisfies the following condition:
to maintain the stability of the various types of fibers in the draft zone, the variation in the auto-leveling draft factor should be directed to the fibers entering the unevenness section. When the roller speed is adjusted, the speed of the rear roller is adjusted by considering the influence of the uneven input length.
At T1(t) adjusting the rear roller speed to V2(t) the fibers fed into the uneven portion move in a state of slow floating fibers, and V is formed by the combined action of the rear fibers and the fast fibers (i.e., the fibers moving at the speed of the front roller)2(t) speed movement, change the draft ratio of the fiber of the input uneven part, realize the auto-leveling. Meanwhile, the fiber entering the drafting zone earlier than the input uneven part moves in a fast floating fiber state through speed change, the movement state cannot be changed due to the speed change of the rear roller, and the influence of the speed change of the roller on the stability of the movement state of the fiber in the drafting zone is reduced.
At T2And (t) finishing the speed change of the rear roller speed at the moment, recovering the original movement speed of the rear fiber and the slow floating fiber after the fiber enters the drafting zone after being input into the uneven part under the influence of the speed change of the rear roller, and maintaining the original movement state of the rear fiber unchanged, thereby eliminating the influence of the speed change of the rear roller on the stability of the movement state of various fibers in the drafting zone and finally realizing the stability of the linear density of output strands.
As a preferred technical scheme:
the self-leveling method of the sliver based on the stable fiber motion state in the draft zone controls the unevenness of the output yarn in the last drawing process to be less than 2%.
The statistical value of the evenness of the sliver in the self-leveling method refers to the variation coefficient of the number of fiber in a certain length segment of the sliver, and the input evenness and the output evenness of the segments with different lengths (namely the lengths of 1cm, 1m, 5m or 10m) can be given according to the statistical data in the discrete drafting model.
In the self-adjusting method for the sliver based on the stable fiber motion state in the drafting zone, the time t when the unevenness reaches the drafting zone is detected by an input sliver line density detection device in front of the drafting device.
The self-adjusting method based on the stable fiber motion state in the drafting zone is used for adjusting the fiber average speed change pointAverage distance l from rear roller jaw2According to the lognormal distribution function of the Narcian variable speed point (reference: Narcian. fiber geometric characteristics to the uneven yarn evenness)]Doctor academic thesis, 2011, university of east hua).
As described above, in the self-leveling method of a sliver based on the stabilization of the moving state of the fiber in the draft zone, the number M of the rear fibers in the draft zone at the time (t-1)2(t-1) value based on discrete drafting model (Ma Baolong, sliver drafting and leveling model research based on discrete theory [ D)]Doctor academic thesis, 2017, university of east hua) were obtained. The discrete drafting model can count the fiber states and distribution conditions of various fibers in the drafting zone at a certain time. Therefore, the change of the number of the rear fibers in the drafting zone at each moment can be obtained only by continuously adopting the discrete drafting model in the process of auto-leveling.
In the self-adjusting method for fiber strand based on stable fiber motion state in the drafting zone, the length l of the non-uniform fiber strand is input at the time t1And testing according to a detection device on the auto-leveling device.
The self-adjusting and leveling method of the fiber strand based on the stable fiber motion state in the drafting zone is characterized in that the number M of the rear fibers in the drafting zone at the time t2(t) study on basis of a discrete drafting model (reference Ma Baolong, sliver drafting and leveling model based on discrete theory) [ D]Doctor academic thesis, 2017, university of east hua) were obtained.
The self-leveling method for the sliver based on the stable fiber motion state in the drafting zone is suitable for the drawing drafting process, the roving drafting process or the spun yarn drafting process in the spinning process.
The self-adjusting and leveling method of the fiber strand based on the stable fiber motion state in the drafting zone is suitable for the drafting process of the fiber strand consisting of different types or properties of fibers.
The principle of the invention is as follows:
the invention divides the floating fiber of the fiber in the drafting zone into slow floating fiber and fast floating fiber, and refines the influence of the roller speed change on the motion state of the floating fiber in the drafting zone. The speed of the back roller is adjusted when the input uneven part of fiber moves in a slow floating fiber state to stabilize the motion state of various fibers in the drafting zone, and the influence of the fluctuation of the number of the input fibers on the motion state stability of the fibers in the drafting zone is eliminated. The invention can accurately calculate the optimal variable speed starting and ending time of the back roller by utilizing the input uneven length, can realize the evenness aiming at the uneven part of the fiber, and can not influence the fiber of other parts.
Compared with the self-adjusting method based on the fiber distribution balance in the drafting zone, the method considers the influence of the input uneven length on the speed change of the self-adjusting back roller, meanwhile, the method refines the classification of the floating fibers, considers the influence of the motion state change of the slow floating fibers and the fast floating fibers on the output uneven length, realizes the self-adjusting by only adjusting the speed of the back roller to adjust the motion state change of the fibers of the input uneven part in the drafting zone, reduces the influence of the speed change of the front roller on the output uneven length, and obtains better effect than the self-adjusting method based on the fiber distribution balance in the drafting zone.
Compared with the traditional self-leveling method, the method considers the influence of the input uneven length on the speed change of the roller after the self-leveling, simultaneously considers the influence of the roller speed change on the motion state of the fiber in the drafting zone, realizes the self-leveling by adjusting the motion state of the fiber in the drafting zone, and obtains the effect better than that of the traditional self-leveling method.
Advantageous effects
The invention relates to a self-adjusting and leveling method based on the stable fiber motion state in a drafting zone, and fibers in the drafting zone are divided into four types of rear fibers, slow floating fibers, fast floating fibers and front fibers according to the holding condition of a receiving roller and different speeds. The discrete drafting model is used for simulating the change of the motion state of the fiber in the drafting zone and simulating the drafting process of the strands. According to the fluctuation of the number of input fibers and the length of the input unevenness, when the fibers of the input unevenness move in a slow floating fiber state, the speed of the back roller is adjusted, when the fibers of the input unevenness become slow floating fibers, the speed of the back roller is adjusted, the stability of various fiber movement states in the drafting zone is maintained, the unevenness is eliminated in the drafting zone, and the self-leveling is realized. The invention refines the leveling process in the drafting zone, emphasizes the stability of the motion state of various fibers in the drafting zone, has better leveling effect on uneven input of strands, and has less uneven output strands. The invention is suitable for drafting processes (such as drawing, roving, spinning and the like) in each spinning process.
Drawings
FIG. 1 is a schematic representation of the strand unevenness of the sliver output from the self-leveling method and the drafting process under non-leveling conditions of the present invention;
FIG. 2 is a schematic diagram of the self-leveling method of the present invention and the evenness of the sliver output by the self-leveling method based on the fiber distribution in the draft zone.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
A self-adjusting method for fiber strands based on stable fiber motion state in a drafting zone is characterized in that fibers in the drafting zone are divided into rear fibers, slow floating fibers, fast floating fibers and front fibers, the distribution of the rear fibers in the drafting zone is obtained through statistics of a discrete drafting model, and the speed of the slow floating fibers in the discrete drafting model is assumed to be consistent with the speed of a rear roller all the time, and the self-adjusting method is that the fiber strands are adjusted in a T mode1(t) adjusting the speed of the rear roller to V2(T) at T2(t) adjusting the speed of the rear roller to the original speed at the moment;
the T is1The calculation method of (t) is as follows:
wherein t is the moment when the unevenness reaches the drafting zone (detected by an input beard linear density detection device in front of the drafting device), and the unit is s; l2The average distance (obtained by calculation according to a lognormal distribution function of the imperial shift points) at the position of the roller jaw after the average shift point distance of the fibers is in mm; v2(t-1) is the back roller speed at time (t-1) in mm/s;
the V is2The calculation method of (t) is as follows:
ΔM2(t)＝M2(t)-M2(t-1)；
wherein M is2(t-1) is the number of the rear fibers in the drafting zone at the moment (t-1) (obtained by statistics according to a discrete drafting model); l1Inputting uneven length for time t, wherein the unit is mm; l is the average length of all fibers in the input fiber strand, and the unit is mm; m2(t) is the number of rear fibers in the drafting zone at the moment t (obtained by statistics according to a discrete drafting model); Δ M2(t) is the fluctuation value of the number of the rear fibers in the drafting zone at the moment t; v1Is the front roller speed, and the unit is mm/s; e0Is the original drafting multiple;
the T is2The calculation method of (t) is as follows:
wherein l1Inputting uneven length for time t, wherein the unit is mm; v2(t) is the speed after the back roller adjustment, and the unit is mm/s;
the number M of rear fibers in the drafting zone at the time t2(t) the number M of rear fibers in the draft zone at the time (t-1)2(t-1) inputting the length l of the unevenness at the time t1And the average length l of all the fibers in the input fiber strand satisfiesThe following conditions were used:
the self-leveling method controls the unevenness rate of the output yarn evenness in the last drawing process to be below 2 percent.
The self-adjusting and leveling method is suitable for drawing drafting process, roving drafting process or spun yarn drafting process in the spinning process.
The self-leveling method of the present invention is suitable for drawing strands made of different types or properties of fibers.
In order to verify the application effect of the invention, the invention is tested in a drawing and drafting process (the distance of the drafting zone is 44mm) in a spinning process, and specifically comprises the following steps: selecting the fiber strands with the linear density of 0.5g/m as the fiber strands input into the drafting zone; the material/type of the fiber in the strand is viscose staple fiber, and the average length of all the fibers in the strand is 34 mm; linear density of the fiber 0.14 tex;
and setting the initial technological parameters in the drawing and drafting process as follows: the nominal draft is 4 times and the front roller speed is 47.1mm/s, and correspondingly the back roller speed is 11.775 mm/s. Meanwhile, an input beard linear density detection device is arranged in front of the drafting device and used for detecting the time when the input unevenness reaches the drafting area.
The invention designs that when the input unevenness of the fiber strands enters the drafting time to be 10s, the linear density of the input fiber strands is adjusted from 0.5g/m to 0.3g/m, and the length of the input unevenness is designed to be 1 cm.
And determining the leveling scheme for adjusting the speed of the back roller according to the test condition parameters, and comparing the fluctuation condition of the output strands. The specific implementation steps are as follows:
first, in the discrete draft model, it is known that: initial front roller velocity V1Initial draft factor E of 47.1mm/s0＝4。
Then, the sliver with linear density of 0.5g/m is fed into the drafting zone, at which the speed V of the front roller1Initial draft factor E of 47.1mm/s04; when the drafting time of the strands is 9s (i.e., (t-1)), utilizing a discrete drafting model to count the number M of the rear fibers at the moment2(t-1) ═ 3568, and rear roller speed
When t is 10s, the input fiber strip linear density detection device detects that the input is uneven, and the average distance from the fiber average speed change point to the jaw of the back roller is l calculated by a Rough speed change point lognormal distribution function237.89 mm. It can be calculated that the time for starting the speed change of the rear roller is T1(t) ═ 13.21 s; and obtaining the number of rear fibers M in the drafting zone by using the discrete drafting model again2(t) 3148 radicals,. DELTA.M2(t) — 420; combining the average length l of all the fibers in the input strand to 34mm, the input uneven length l110mm, the speed of the rear roller can be calculated as V2(T) 19.632mm/s and T is the end of the back roller speed change time2(t)＝13.719s。
And finally, counting the number of fiber in each 1cm long section of the fiber strands output by the drafting zone according to a discrete drafting model, and calculating to obtain the unevenness rate CV of the output fiber strands which is 2%. As shown in fig. 1 and 2.
Similarly, the drawing drafting process is carried out by adopting non-uniform conditions (i.e. drafting is carried out according to preset drafting parameters without any variable speed adjustment), and the initial conditions of drafting are consistent with the method; the unevenness of the output fiber strand is shown in figure 1;
similarly, the drawing and drafting process is carried out by a method based on a fiber distribution equilibrium self-leveling method (patent application No. CN201710328644.7), and the initial condition of drafting is consistent with the method; the unevenness of the output fiber strand is shown in FIG. 2;
as can be seen from FIGS. 1 and 2, the self-leveling method of the present invention has a lower unevenness of the output strands and a better uniformity of the output strands.
Claims (7)
1. Based onThe self-adjusting and leveling method of the fiber strand with stable fiber motion state in the drafting zone comprises the following steps of dividing the fiber in the drafting zone into rear fiber, slow floating fiber, fast floating fiber and front fiber, and counting the distribution of the rear fiber in the drafting zone through a discrete drafting model, and is characterized in that: assuming that the speed of the slow floating fiber in the discrete drafting model is always consistent with the speed of the back roller, the self-adjusting and leveling method is that the speed of the slow floating fiber in the discrete drafting model is always consistent with the speed of the back roller1(t) adjusting the speed of the rear roller to V2(T) at T2(t) adjusting the speed of the rear roller to the original speed at the moment;
the T is1The calculation method of (t) is as follows:
wherein t is the moment when the unevenness reaches the drafting zone, and the unit is s; l2The average distance of the roller jaw after the average speed change point of the fiber is the unit of mm; v2(t-1) is the back roller speed at time (t-1) in mm/s;
the V is2The calculation method of (t) is as follows:
ΔM2(t)＝M2(t)-M2(t-1)；
wherein M is2(t-1) is the number of the rear fibers in the drafting zone at the moment (t-1), and the unit is root; l1Inputting uneven length for time t, wherein the unit is mm; l is the average length of all fibers in the input fiber strand, and the unit is mm; m2(t) is the number of the rear fibers in the drafting zone at the time t, and the unit is root; Δ M2(t) is the fluctuation value of the number of the rear fibers in the drafting zone at the moment t; v1Is the front roller speed, and the unit is mm/s; e0Is the original drafting multiple;
the T is2The calculation method of (t) is as follows:
wherein l1Inputting uneven length for time t, wherein the unit is mm; v2(t) is the speed after the back roller adjustment, and the unit is mm/s;
the number M of rear fibers in the drafting zone at the time t2(t) the number M of rear fibers in the draft zone at the time (t-1)2(t-1) inputting the length l of the unevenness at the time t1And the average length l of all fibres in the input sliver satisfies the following condition:
2. the method of claim 1, wherein the time t when the unevenness reaches the drafting zone is detected by an input beard line density detecting device before the drafting device.
3. A method according to claim 1, wherein the average distance l of the fiber at the roller nip after the average speed change point is constant is2And calculating according to a dot-counting normal distribution function of the Narcin variable speed point.
4. The method of claim 1, wherein the number of the rear fibers M in the draft zone at the time (t-1) is set to be equal to the number of the rear fibers M in the draft zone2And (t-1) is obtained according to the statistics of the discrete drafting model.
5. The method as claimed in claim 1, wherein the number of the rear fibers in the draft zone at the time t is set to be constantM2(t) obtaining the result according to the statistics of the discrete drafting model.
6. The self-leveling method for fiber strands based on the stable fiber motion state in the drafting zone according to claim 1, wherein the self-leveling method is suitable for drawing drafting process, roving drafting process or spun yarn drafting process in the spinning process.
7. The method of claim 1, wherein the method is suitable for drawing of strands made of different types or properties of fibers.
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| CN106868660A (en) * | 2017-04-06 | 2017-06-20 | 东华大学 | A kind of roller draft analogy method arranged in sliver based on fiber |
| CN107190375A (en) * | 2017-05-11 | 2017-09-22 | 东华大学 | A kind of autoleveller method based on fiber distributing equilibrium in draw zone |
| CN212270311U (en) * | 2020-04-09 | 2021-01-01 | 宝鸡市华新机电有限公司 | Open-loop fixed-length detection auto-leveling control device |
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