Combing and drawing combined method for ramie, short flax and wool fibers

Abstract

The invention relates to a combing and drawing combined method for ramie, short flax and wool fibers, which comprises the following steps: step A, carding fibers by a wool type combing machine to form a web, and bundling the web into periodically uneven combed slivers through a horn mouth of a wool collecting hopper after the web passes through a winding roller; b, combining a plurality of combing slivers which are output by a plurality of wool type combing machines and have periodical unevenness through a specific path, and correspondingly combining thick sections and thin sections on the combing slivers so as to improve the unevenness of combined slivers; the computer simulates fiber motion, determines the optimal position of the horn mouth of the wool collecting hopper, can improve the unevenness of the combing slivers, adjusts the head end distance difference of the combing slivers through the guide roller according to the unevenness periodicity of the combing slivers, and determines the position of the guide roller through simulation calculation, so that the coarse and fine parts of the combing slivers with periodical unevenness are correspondingly combined, and the combing slivers with periodical unevenness are combined. And the unevenness of the combined strips can be obviously improved.

Description

Technical Field

[0001] The invention belongs to the technical field of textile technology, and in particular relates to a combined combing and drawing method for ramie, flax and wool fibers. Background Art

[0002] In the conventional combing process of ramie, flax and wool fibers, wool-type combing machines are used because the average fiber length is about 100 mm. In each combing cycle, the ramie / wool sliver is fed into the combing machine through the feeding roller, and after being combed by the combing elements such as the cylinder and the top comb, a fiber bundle with a certain length is output, and it is overlapped on the fiber bundle output in the previous combing cycle according to a certain effective output length to form a fiber net, and is gathered into a combed sliver through the trumpet of the hair collecting bucket. The combed sliver has obvious periodic unevenness, and its periodicity is related to the fiber length and combing process parameters.

[0003] At present, a wool combing machine has only one combing unit, so after combing, it usually needs to go through 4-5 drawing processes to improve the periodic unevenness of the combed sliver. With the development of technology, the concept of directly combining and drafting the combed slivers output by multiple wool combing machines through the combing and drawing combined technology has been proposed, so as to realize the continuous production of wool combing. Ramie, flax and wool fibers have long fiber lengths and large length unevenness. In the ramie, flax and wool fiber combing and drawing combined technology, how to improve the unevenness of the combed sliver and the combined sliver is a difficult problem that needs to be solved urgently.

[0004] In order to improve the unevenness of combed slivers, cotton combing machines have some solutions. For example, the technical solution of invention patent CN102704052A calculates the optimal position of the bell mouth of the hair collecting bucket on the cotton combing machine to improve the unevenness of the combed sliver. However, unlike the fixed bundling triangle of the cotton combing machine, the winding roller on the wool combing machine swings back and forth with the extraction vehicle, so the bundling triangle will also change accordingly, which will have a great impact on the optimal position of the bell mouth of the hair collecting bucket. Therefore, the technical solution described in the above patent is not suitable for determining the optimal bell mouth position of the hair collecting bucket of the wool combing machine.

[0005] In addition, in the current cotton spinning combing and drawing machine, 8 combing units are combed into strips respectively, and the combed strips are directly combined on the guide table and then stretched by the drawing and drawing mechanism to form combined strips for output, and the unevenness of the strips can be reduced to a certain extent. However, the cotton spinning combing and drawing machine only uses the combination itself to improve the uniformity of the strips, and does not reasonably match it according to the law of its periodic unevenness, so that the coarse and fine details on each combed strip correspond to the combination, so the improvement of the unevenness of the combined strips is limited. The length of cotton fiber is short (20-35mm), and the periodic change of the unevenness of cotton combed strips is small under different combing processes. Therefore, when the combed strips are combined on the cotton combing machine, the path does not need to be changed. However, the fiber length of ramie, flax short hemp and wool fibers is long (about 100mm) and the unevenness is large. Under different combing processes, the periodic change of the unevenness of the combed strips is obvious, and it has a significant impact on the combining effect. Therefore, if you want to effectively improve the unevenness of the combed strips when combining ramie, flax and wool fibers, you must reasonably set the paths of each combed strip when combining based on the periodicity of the unevenness of the combed strips so that the coarse and fine details on each combed strip correspond to the combination. This can significantly improve the unevenness of the combined strips. Summary of the invention

[0006] The main purpose of the present invention is to propose a combined method for combing and drawing ramie, flax and wool fibers, which can effectively solve the problems in the background technology.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A combined combing and drawing method for ramie, flax and wool fibers comprises the following steps:

[0009] Step A: The wool-type combing machine combs the fibers into a web, and the fiber web passes through the take-up roller and is bundled into periodic uneven combed strips through the bell mouth of the wool collecting bucket;

[0010] In step A, the optimal position of the bell mouth of the hair collecting bucket is determined to improve the unevenness of the combed sliver;

[0011] Step B: merging a plurality of periodically uneven combed slivers outputted from a plurality of wool-type combing machines through a specific path so that the coarse and thin sections on the plurality of combed slivers are correspondingly merged to improve the unevenness of the merged slivers;

[0012] In step B, the specific path of each combed sliver is controlled by a guide roller with adjustable position, and the position of the guide roller is determined so that the coarse and fine grains of adjacent combed slivers correspond to each other and merge;

[0013] Preferably, the optimal position of the bell mouth of the hair collecting bucket can be determined by the following method:

[0014] Computer is used to simulate the movement of fibers. According to the shape of the bunching triangle at each moment, the speed of the fibers and the displacement of the fibers, the arrangement of each fiber in the combed strip after passing through the bunching triangle is obtained. Then the unevenness of the combed strip can be calculated, and the optimal position of the bell mouth of the hair collecting bucket can be determined based on the unevenness of the combed strip.

[0015] Preferably, the specific method comprises the following steps:

[0016] The width of the fiber web output by the take-up roller is defined as D. When the extraction vehicle swings to the position closest to the bell mouth of the hair collecting bucket, the vertical distance from the take-up roller to the bell mouth of the hair collecting bucket is h1. When the extraction vehicle swings to the position farthest from the bell mouth of the hair collecting bucket, the vertical distance from the take-up roller to the bell mouth of the hair collecting bucket is h2. The vertical distance from the bell mouth of the hair collecting bucket to the edge of the fiber web is W. The diameter of the bell mouth of the hair collecting bucket is d'.

[0017] A rectangular coordinate system is established with the winding roller as the Y axis, the direction perpendicular to the winding roller as the X axis, and the midpoint of the winding roller as the origin of the coordinate system;

[0018] A fiber in the fiber web (the i-th fiber) has a Y-axis coordinate of y1(i), a fiber length of l(i), and a fiber fineness of f(i);

[0019] Then, in the clustering area, the displacement difference of the i-th fiber on the X-axis is Sx(i), and the displacement on the Y-axis is Sy(i);

[0020] Sx(i) and Sy(i) are obtained by the following formula;

[0021]

[0022]

[0023] Among them, h is the vertical distance from the take-up roller to the bell mouth of the hair collecting bucket at each moment, h1≤h≤h2, h1 and h2 are related to the overlap length and the effective output length;

[0024] The simulation calculation can obtain the coordinates of the head end of each fiber in the overlapped combed fiber web as [x1(i), y1(i)];

[0025] After being bundled by the bell mouth of the hair collecting bucket, the coordinates of the fiber head end in the output combed sliver can be obtained [x2(i), y2(i)], where the coordinate of the fiber on the X axis is x2(i)=x1(i)+Sx(i), and the coordinate on the Y axis is y2(i)=y1(i)+Sy(i);

[0026] Calculate the unevenness of combed sliver;

[0027] Finally, after simulation calculation, the optimal position of the bell mouth of the hair collecting bucket was determined according to the unevenness of the combed sliver.

[0028] Preferably, the position of the guide roller can be determined by the following method:

[0029] Define the combing unit closest to the back roller of the drawing and drafting mechanism as the first unit, the next one is the second unit, and the farthest one is the nth unit;

[0030] According to the simulation method in step A, the head end coordinates of the fibers in the combed sliver can be obtained as [x2(i), y2(i)];

[0031] The coordinates of the fibers in the combed sliver output by n combing units are obtained through multiple simulations, and the coordinates of the fibers in the combed sliver output by the j-th combing unit are defined as [x2(j,i), y2(j,i)];

[0032] From the first to the nth combing unit, the vertical distances from the delivery roller to the guide roller are L1, L2, ..., L n The horizontal distance from the sliver roller to the guide roller is adjustable, which are G1, G2, ..., G n ;

[0033] Then the distance between the guide roller of the jth comber and the back roller of the drawing frame is M1, M2, ..., M n The lengths of the yarn from the delivery roller of each combing machine to the back roller of the drawing and drafting mechanism are R1, R2, R3, ..., R n ;

[0034]

[0035] Then, the difference between the head end of the first combed sliver and the head end of the second combed sliver is R1+R2, the difference between the head end of the first combed sliver and the head end of the third combed sliver is R1+R3, and so on. That is, when the combed sliver output by the jth combing unit reaches the back roller of the drawing and drafting mechanism, the X-axis coordinate of the fiber is x3(j, i)=x2(j, i)+R j ;

[0036] Finally, calculate the unevenness of the combined sliver after the combed sliver is combined;

[0037] The unevenness of the combined strip is calculated by the following method:

[0038] The calculated segment length is Δ, and there are m segments in total. The weight w of the kth segment of each combed sliver can be calculated. j (k);

[0039] Then the total weight of the fragment after merging is calculated as w(k);

[0040]

[0041] After merging, the unevenness of the merged strip is the coefficient of variation of the weight w of the m segments;

[0042] Through simulation calculation, the position of the guide roller is determined according to the unevenness of the combined strips, so that the coarse and fine particles of adjacent combed strips can be combined correspondingly.

[0043] The present invention provides a combined combing and drawing method for ramie, flax and wool fibers, which has the following beneficial effects:

[0044] The present invention uses computer simulation of fiber movement to determine the optimal position of the bell mouth of the hair collecting bucket, which can improve the unevenness of the combed strip. According to the periodicity of the unevenness of the combed strip, the head end path difference of the combed strip is adjusted through the guide roller, and the position of the guide roller is determined by simulation calculation, so that the coarse and fine details of the combed strip with periodic unevenness can be correspondingly merged, which can significantly improve the unevenness of the merged strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the combing bunching area and guide roller of the present invention;

[0046] Figure 2 It is a schematic diagram of the overlap of fiber bundles and the uneven weight curve thereof of the present invention;

[0047] Figure 3 This is a schematic diagram of calculating the unevenness of n combed slivers according to the present invention. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0049] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0051] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] Reference Figure 1 , 1 is the take-up roller, 2 is the bell mouth of the hair collecting bucket, 3 is the sliver delivery roller, 4 is the guide roller, 4' is the position of the guide roller when c=100mm, 5 is the fiber web, 6 is the path of the combed sliver when it passes through the 4 guide roller after bundling, and 6 is the path of the combed sliver when it passes through the 4' guide roller after bundling.

[0053] The present invention provides a combined combing and drawing method for ramie, flax and wool fibers, comprising the following steps:

[0054] Step A: The wool-type combing machine combs the fibers into a web, and the fiber web passes through the take-up roller and is bundled into periodic uneven combed strips through the bell mouth of the wool collecting bucket;

[0055] In step A, the optimal position of the bell mouth of the hair collecting bucket is determined to improve the unevenness of the combed sliver;

[0056] The area from the take-up roller of the wool combing machine to the bell mouth of the wool collecting bucket is defined as the bundling triangle. During bundling, the combined speed of each fiber is the same, but due to the difference in the position of each fiber in the fiber web, the component speeds in the direction perpendicular to the take-up roller and parallel to the vertical roller are different, resulting in displacement difference and mixing.

[0057] Therefore, the optimal position of the bell mouth of the hair collecting bucket can be determined by the following method:

[0058] Computer is used to simulate the movement of fibers. According to the shape of the bunching triangle at each moment, the speed of the fibers and the displacement of the fibers, the arrangement of each fiber in the combed strip after passing through the bunching triangle is obtained. Then the unevenness of the combed strip can be calculated, and the optimal position of the bell mouth of the hair collecting bucket can be determined based on the unevenness of the combed strip.

[0059] The specific method includes the following steps:

[0060] The width of the fiber web output by the take-up roller is defined as D. When the extraction vehicle swings to the position closest to the bell mouth of the hair collecting bucket, the vertical distance from the take-up roller to the bell mouth of the hair collecting bucket is h1. When the extraction vehicle swings to the position farthest from the bell mouth of the hair collecting bucket, the vertical distance from the take-up roller to the bell mouth of the hair collecting bucket is h2. The vertical distance from the bell mouth of the hair collecting bucket to the edge of the fiber web is W. The diameter of the bell mouth of the hair collecting bucket is d'.

[0061] A rectangular coordinate system is established with the winding roller as the Y axis, the direction perpendicular to the winding roller as the X axis, and the midpoint of the winding roller as the origin of the coordinate system;

[0062] A fiber in the fiber web (the i-th fiber) has a Y-axis coordinate of y1(i), a fiber length of l(i), and a fiber fineness of f(i);

[0063] Then, in the clustering area, the displacement difference of the i-th fiber on the X-axis is Sx(i), and the displacement on the Y-axis is Sy(i);

[0064] Sx(i) and Sy(i) are obtained by the following formula;

[0065] ;

[0066] ;

[0067] Wherein, h is the vertical distance from the take-up roller to the bell mouth of the hair collecting bucket corresponding to each moment, h1≤h≤h2, the combing machine speed is Q clamp times / min, that is, the vertical distance from the take-up roller to the bell mouth of the hair collecting bucket changes from h1 to h2 and then returns to h1 within 60 / Q seconds, and h1 and h2 are related to the overlap length and the effective output length;

[0068] First, according to the "Combing process parameter determination method based on combing simulation of fiber arrangement" disclosed in patent number CN109948210B, the combing process of the combed small roll (raw material fed into the combing machine) in the cylinder is simulated, and then according to the method of the paper Xiao Yuqing. Combing separation and joining process simulation [D]. Donghua University, 2020. (Section 2.1-2.3, pages 9-24), the combing process of the top comb in the combing is simulated to separate the combed fiber bundles, and the fiber bundles are overlapped to form a combed fiber web. The head end coordinates of each fiber in the overlapped combed fiber web can be obtained through the above simulation calculation as [x1(i), y1(i)];

[0069] After being bundled by the bell mouth of the hair collecting bucket, the coordinates of the fibers in the output combed sliver can be obtained [x2(i), y2(i)], where the coordinates of the fibers on the X-axis are x2(i)=x1(i)+Sx(i), and the coordinates on the Y-axis are y2(i)=y1(i)+Sy(i);

[0070] Reference paper Xiao Yuqing. Simulation of combing separation and joining process [D]. Donghua University, 2020. (Section 2.3.2) is used to calculate the unevenness of the combed sliver;

[0071] Finally, after simulation calculation, the optimal position of the bell mouth of the hair collecting bucket was determined according to the unevenness of the sliver.

[0072] Under different feeding lengths, extraction distances and effective output lengths, the unevenness of the combed cotton web is different.

[0073] In this embodiment, refer to Figure 2 , the effective output length of the combing machine is 50-90mm, and the overlap length is 160-200mm;

[0074] Through simulation calculation, the optimal position of the collecting bucket bell mouth, that is, the position of the center of the collecting bucket bell mouth is when the vertical distance a from the winding roller jaw line is 70-100mm, and the horizontal distance b from the winding roller jaw line center is 180-190mm, the unevenness of the output combed sliver is less.

[0075] Step B: merging a plurality of periodically uneven combed slivers outputted from a plurality of wool-type combing machines through a specific path so that the coarse and thin sections on the plurality of combed slivers are correspondingly merged to improve the unevenness of the merged slivers;

[0076] In step B, the specific path of each combed sliver is controlled by a guide roller with adjustable position, and the position of the guide roller is determined so that the coarse and fine grains of adjacent combed slivers correspond to each other and merge;

[0077] The position of the guide roller can be determined by the following methods:

[0078] Define the combing unit closest to the back roller of the drawing and drafting mechanism as the first unit, the second unit next, and the nth unit farthest. The drawing and drafting mechanism is located at Figure 1 Left side of the middle combed strip;

[0079] According to the simulation method in step A, the head end coordinates of the fibers in the combed sliver can be obtained as [x2(i), y2(i)];

[0080] The coordinates of the fibers in the combed sliver output by n combing units are obtained through multiple simulations, and the coordinates of the fibers in the combed sliver output by the j-th combing unit are defined as [x2(j,i), y2(j,i)];

[0081] From the first to the nth combing unit, the vertical distances from the delivery roller to the guide roller are L1, L2, ..., L n The horizontal distance from the sliver roller to the guide roller is adjustable, which are G1, G2, ..., G n ;

[0082] Then the distance between the guide roller of the jth comber and the back roller of the drawing frame is M1, M2, ..., M n The lengths of the yarn from the delivery roller of each combing machine to the back roller of the drawing and drafting mechanism are R1, R2, R3, ..., R n ;

[0083] ;

[0084] Then, the difference between the head end of the first combed sliver and the head end of the second combed sliver is R1+R2, the difference between the head end of the first combed sliver and the head end of the third combed sliver is R1+R3, and so on. That is, when the combed sliver output by the jth combing unit reaches the back roller of the drawing and drafting mechanism, the X-axis coordinate of the fiber is x3(j, i)=x2(j, i)+R j ;

[0085] Finally, calculate the unevenness of the combined sliver after the combed sliver is combined;

[0086] Referring to the method in Section 2.3.2 of "Simulation of Combing Separation and Joining Process", the unevenness of the combined strip is calculated by the following method:

[0087] like Figure 3 As shown, the calculated segment length is Δ, with a total of m segments, and the weight w of the kth segment of each combed sliver can be calculated j (k);

[0088] Then the total weight of the fragment after merging is calculated as w(k);

[0089] ;

[0090] After merging, the unevenness of the merged strip is the coefficient of variation of the weight w of the m segments;

[0091] Through simulation calculation, the position of the guide roller is determined according to the unevenness of the combined strips, so that the coarse and fine particles of adjacent combed strips can be combined correspondingly.

[0092] In this embodiment, when the horizontal distance c between the center of the guide roller and the center of the jaw line of the corresponding combing unit's sliver delivery roller is 20-100 mm, and the vertical distance d between the centers of adjacent guide rollers is 30 mm, the coarse and fine details of adjacent combed slivers can be correspondingly merged to achieve effective and uniform merging, and the uniformity of the merged slivers after merging is significantly improved.

[0093] The present invention uses computer simulation of fiber movement to determine the optimal position of the bell mouth of the hair collecting bucket, which can improve the unevenness of the combed strip. According to the periodicity of the unevenness of the combed strip, the head end path difference of the combed strip is adjusted through the guide roller, and the position of the guide roller is determined by simulation calculation, so that the coarse and fine details of the combed strip with periodic unevenness can be correspondingly merged, which can significantly improve the unevenness of the merged strip.

[0094] The effects of the combined combing and drawing process of ramie, flax and wool fibers of the present invention will be further described below in conjunction with specific embodiments.

[0095] Comparative Example 1

[0096] Flax short combed slivers were spun on a conventional wool-type combing machine, and then a drawing process was performed. The average length of the flax fiber was 100 mm, the effective output length of the combing machine was 70 mm, and the overlap length was 180 mm. Eight combed slivers were randomly matched and fed into the drawing machine. After drawing, the unevenness of the output slivers was 3.95%.

[0097] Example 1

[0098] The ramie, flax and wool fiber combing and drawing combined process of the present invention is adopted to spin flax combed strips on a wool type combing and drawing combined machine, the average fiber length of the flax fiber is 100 mm, the vertical distance between the center of the bell mouth of the hair collecting bucket of each combing machine and the clamp line of the winding roller is 96 mm, and the horizontal distance between the center of the bell mouth of the winding roller and the center of the clamp line of the winding roller is 183 mm, the horizontal distance between the center of the guide roller and the center of the clamp line of the strip output roller of the corresponding combing unit is 70 mm, and the vertical distance between the centers of adjacent guide rollers is 30 mm, the effective output length of the combing machine is 70 mm, the overlap length is 180 mm, the unevenness rate of the output fiber web is 29.4%, the unevenness rate of the combed strip after being bundled by the bell mouth is 25.7%, and the unevenness rate of the output flax strip after 8 combed strips are combined and stretched is 2.97%, which is obviously better than the unevenness of the flax strip output in comparative example 1, and the uniformity of the strip is significantly improved.

[0099] Example 2

[0100] The ramie, flax and wool fiber combing and drawing combined process of the present invention is adopted to spin wool combed strips on a wool type combing and drawing combined machine, the average fiber length of the wool fiber is 80 mm, the vertical distance between the center of the bell mouth of the wool collecting bucket of each combing machine and the clamp line of the winding roller is 70 mm, and the horizontal distance between the center of the bell mouth of the wool collecting bucket and the clamp line of the winding roller is 190 mm, the horizontal distance between the center of the guide roller and the center of the clamp line of the strip output roller of the corresponding combing unit is 20 mm, and the vertical distance between the centers of adjacent guide rollers is 30 mm, the effective output length of the combing machine is 50 mm, the overlap length is 200 mm, the unevenness rate of the output fiber web is 32.3%, the unevenness rate of the combed strip after being bundled by the bell mouth is 28.4%, and the unevenness rate of the output flax strip after merging and drawing 4 combed strips is 3.02%, which is better than the unevenness of the wool strip output by the conventional wool type combing machine + drawing machine under the same conditions, and the uniformity of the strip is significantly improved.

[0101] Example 3

[0102] The ramie, flax and wool fiber combing and drawing combined process of the present invention is adopted to spin ramie combed sliver on a wool type combing and drawing combined machine, the average fiber length of the ramie fiber is 120 mm, the vertical distance between the center of the hair collecting bucket bell mouth of each combing machine and the take-up roller jaw line is 100 mm, the horizontal distance between the center of the guide roller and the take-up roller jaw line center is 180 mm, the horizontal distance between the center of the guide roller and the sliver delivery roller jaw line center of the corresponding combing unit is 100 mm, The vertical distance between the centers of adjacent guide rollers is 30 mm, the effective output length of the combing machine is 90 mm, the overlap length is 160 mm, the unevenness of the output fiber web is 29.9%, and the unevenness of the combed strips is 27.3% after being bundled at the bell mouth. After 12 combed strips are combined and stretched, the unevenness of the output flax strips is 2.82%. Under the same conditions, the unevenness of the flax strips is better than that of the conventional wool-type combing machine + drawing frame, and the uniformity of the strips is significantly improved.

[0103] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A combined method for combing and drawing ramie, flax and wool fibers, characterized in that: The following steps are involved: Step A: The wool-type combing machine combs the fibers into a web, and the fiber web passes through the take-up roller and is bundled into periodic uneven combed strips through the bell mouth of the wool collecting bucket; In step A, the optimal position of the bell mouth of the hair collecting bucket is determined to improve the unevenness of the combed sliver; Step B: merging a plurality of periodically uneven combed slivers outputted from a plurality of wool-type combing machines through a specific path so that the coarse and thin sections on the plurality of combed slivers are correspondingly merged to improve the unevenness of the merged slivers; In step B, the specific path of each combed strip is controlled by a guide roller whose position can be adjusted, and the position of the guide roller is determined so that the coarse and fine particles of adjacent combed strips correspond to each other.

2. A combined combing and drawing method for ramie, flax and wool fibers according to claim 1, characterized in that: The optimal position of the bell mouth of the hair collecting bucket is determined by the following method: The fiber movement is simulated by computer. According to the shape of the bunching triangle at each moment, the speed of the fiber and the displacement of the fiber, the arrangement of each fiber in the combed strip after passing through the bunching triangle is obtained. Then the unevenness of the combed strip is calculated, and the optimal position of the bell mouth of the hair collecting bucket is determined according to the unevenness of the combed strip.

3. A combined combing and drawing method for ramie, flax and wool fibers according to claim 2, characterized in that: The specific method includes the following steps: The width of the fiber web output by the take-up roller is defined as D. When the extraction vehicle swings to the position closest to the bell mouth of the hair collecting bucket, the vertical distance from the take-up roller to the bell mouth of the hair collecting bucket is h1. When the extraction vehicle swings to the position farthest from the bell mouth of the hair collecting bucket, the vertical distance from the take-up roller to the bell mouth of the hair collecting bucket is h2. The vertical distance from the bell mouth of the hair collecting bucket to the edge of the fiber web is W. The diameter of the bell mouth of the hair collecting bucket is d'. A rectangular coordinate system is established with the winding roller as the Y axis, the direction perpendicular to the winding roller as the X axis, and the midpoint of the winding roller as the origin of the coordinate system; A fiber in the fiber web, i.e. the i-th fiber, has a Y-axis coordinate of y1(i), a fiber length of l(i), and a fiber fineness of f(i); Then, in the clustering area, the displacement difference of the i-th fiber on the X-axis is Sx(i), and the displacement on the Y-axis is Sy(i); Sx(i) and Sy(i) are obtained by the following formula; ； ； Among them, h is the vertical distance from the take-up roller to the bell mouth of the hair collecting bucket at each moment, h1≤h≤h2, h1 and h2 are related to the overlap length and the effective output length; The coordinates of the head end of each fiber in the combed fiber web after overlapping are obtained by simulation calculation as [x1(i), y1(i)]; After being bundled by the bell mouth of the hair collecting bucket, the coordinates of the fiber head end in the output combed sliver are obtained [x2(i), y2(i)], where the coordinate of the fiber on the X-axis is x2(i)=x1(i)+Sx(i), and the coordinate on the Y-axis is y2(i)=y1(i)+Sy(i); Calculate the unevenness of combed sliver; Finally, after simulation calculation, the optimal position of the bell mouth of the hair collecting bucket was determined according to the unevenness of the combed sliver.

4. A combined combing and drawing method for ramie, flax and wool fibers according to claim 3, characterized in that: The position of the guide roller is determined by: Define the combing unit closest to the back roller of the drawing and drafting mechanism as the first unit, the next one is the second unit, and the farthest one is the nth unit; According to the simulation method in step A, the head end coordinates of the fibers in the combed sliver are obtained as [x2(i), y2(i)]; The coordinates of the fibers in the combed sliver output by n combing units are obtained through multiple simulations, and the coordinates of the fibers in the combed sliver output by the j-th combing unit are defined as [x2(j,i), y2(j,i)]; From the first to the nth combing unit, the vertical distances from the delivery roller to the guide roller are L1, L2, ..., L n The horizontal distance from the sliver roller to the guide roller is adjustable, which are G1, G2, ..., G n ; Then the distance between the guide roller of the jth comber and the back roller of the drawing frame is M1, M2, ..., M n The lengths of the yarn from the delivery roller of each combing machine to the back roller of the drawing and drafting mechanism are R1, R2, R3, ..., R n ; ； Then, the difference between the head end of the first combed sliver and the head end of the second combed sliver is R1+R2, the difference between the head end of the first combed sliver and the head end of the third combed sliver is R1+R3, and so on. That is, when the combed sliver output by the jth combing unit reaches the back roller of the drawing and drafting mechanism, the X-axis coordinate of the fiber is x3(j, i)=x2(j, i)+R j ; Finally, calculate the unevenness of the combined sliver after the combed sliver is combined; The unevenness of the combined strip is calculated by the following method: Calculate the length of the segment as Δ, there are m segments in total, and calculate the weight w of the kth segment of each combed sliver j (k); Then the total weight of the fragment after merging is calculated as w(k); ； After merging, the unevenness of the merged strip is the coefficient of variation of the weight w of the m segments; Through simulation calculation, the position of the guide roller is determined according to the unevenness of the combined strips, so that the coarse and fine particles of adjacent combed strips can be combined correspondingly.

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