CN104726976B - The method for spinning colorful ring or point point yarn based on two-component two level drawing-off - Google Patents

Abstract

The invention discloses a method for spinning multicolored slub yarns and dotted yarns based on two-component two-stage drafting, which specifically includes a drafting and twisting system including a primary drafting unit and a secondary drafting unit arranged before and after; The first-level drafting unit includes the combined rear roller and the middle roller; the second-level drafting unit includes the front roller and the middle roller; the dynamic change of the two-component mixing ratio and the yarn linear density is controlled through the first-level asynchronous drafting, and the two-component Level synchronous drafting controls the size of the reference linear density (or equivalent linear density) of the yarn. The invention can not only precisely control the change of its linear density (the dots on the reference yarn, the shape of the slub), but also can precisely control the change of the yarn color (the color of the reference yarn and its dots, and the shape of the slub). At the same time, by controlling the middle roller to rotate at a constant set speed, the reproducibility of the pattern and color of the yarn with variable linear density is guaranteed, and the spinning effect is more stable.

Description

Method for spinning multicolored slub or dotted yarns based on two-component two-stage drafting

technical field

The invention relates to the field of spinning in textile engineering, in particular to a method and device for spinning multicolored slub yarns or dotted yarns based on two-component two-stage synchronous drafting.

Background technique

Yarn is an elongated fiber assembly formed by twisting fibers in parallel orientation. When the fibers are not evenly distributed in the length direction of the yarn, its linear density (or appearance) will increase a dynamic linear density (dynamic thickness) on the basis of the reference linear density (reference thickness), resulting in the yarn line Density (or thickness) changes. According to the size of this uneven distribution, it can be classified into slub yarn, dot yarn, etc., or collectively referred to as fancy yarn with linear density change. If the blending ratio can be changed while the linear density of the yarn is changed, fancy yarns with variable linear density and color can be formed. We define this type of yarn as colorful variable density yarn, which can be divided into It is colorful slub yarn, colorful dot yarn, etc.

At present, the method for producing variable linear density yarn by ring spinning basically uses the middle and rear rollers to feed a roving sliver respectively, and performs intermittent spinning through the uneven feeding of the rear roller to produce variable linear density yarn. For example, the patent "A Discontinuous Spinning Process and Its Yarn" (Authorization No. ZL01126398.9), its principle is that an auxiliary yarn sliver B fed by the rear roller is unevenly drawn by the middle and rear rollers , and then intersect with another main yarn strand A fed from the rear point of the middle roller, and then enter the front drafting area, after being drafted by the front and middle rollers, it is output from the front nip, and enters the twisting area to be twisted together to form a yarn . Since the auxiliary yarn is fed into the main yarn by the gap feeding of the back roller, under the action of the main draft multiple in the front area, the main yarn is evenly drawn to a certain linear density, and the auxiliary yarn is attached to the main yarn. Intermittent uneven linear density distribution is formed on the yarn whiskers. By controlling the amount of fluctuation in the uneven feeding of the auxiliary yarn by the rear roller, different effects such as slubs and dots can be formed on the yarn.

The spinning process of the variable linear density yarn in the prior art has the following limitations:

① When two different raw materials (or different colors) of roving are used as the main and auxiliary yarn strands, the blending ratio (mixing color ratio) of the yarn cannot be randomly adjusted online;

② During the spinning process, the main and auxiliary yarns cannot be exchanged (the main yarn whiskers are continuously distributed in the yarn, and the auxiliary yarn whiskers are discretely distributed in the yarn), resulting in spinning yarn pattern Monotonous, with few variables.

③ The reproducibility of the pattern is poor. In the existing yarn forming method of changing the linear density of the yarn, the finally formed slub (thick and fine details) shape and the shape of the dots are related to the spindle speed of the spinning machine. The shapes of the bamboo joints (coarse details), the shape and color of the dots formed by different spindle speeds will be different.

Contents of the invention

In order to solve the above problems, the object of the present invention is to provide a method for spinning colorful slub yarn or colorful dotted yarn based on two-component split-combined secondary drafting to realize online dynamic regulation of spinning linear density and blending ratio. This method changes the traditional synchronous drafting of the front and rear areas of two components into two-component separated asynchronous drafting (hereinafter referred to as one-stage asynchronous drafting) and two-component combined synchronous drafting (hereinafter referred to as two-stage synchronous drafting), The two-component mixing ratio and the dynamic change of the yarn linear density are controlled by one-stage asynchronous drafting, and the equivalent linear density (or reference linear density) of the yarn is controlled by two-stage synchronous drafting. Through the spinning device and process of the two-component separation and synchronous two-stage drafting of the present invention, which is combined and twisted into yarn, random online dynamic control of the changes in the linear density of the spinning yarn and the blending ratio can be realized, breaking through the original bamboo There are three technical bottlenecks in the process of knuckle yarn or dot yarn spinning: ① only the yarn density can be adjusted but not its blending ratio (or color change); ② the yarn pattern is single; ③ the pattern reproducibility is poor.

In order to achieve the above purpose, a method for spinning colorful slub or dotted yarn based on two-component two-stage drafting disclosed by the present invention specifically includes:

1) The drafting and twisting system includes a first-level asynchronous drafting unit and a second-level synchronous drafting unit arranged front and back;

2) The first-stage asynchronous drafting unit includes a combined rear roller and a middle roller; the combined rear roller includes a first rear roller and a second rear roller arranged side by side on the same rear roller shaft; the first rear roller and the second rear roller Rotate with line speed V _h1 and V _h2 respectively; Middle roller rotates with line speed V _z ; Described secondary synchronous drafting unit comprises front roller and described middle roller; Front roller rotates with surface line speed V _q ; Set the first The linear densities of the first component roving and the second component roving drafted by the back roller and the second rear roller are ρ ₁ and ρ ₂ respectively, and the linear density of the yarn Y obtained after drafting and twisting by the front roller is ρ _y ,

3) According to the set blending ratio and/or linear density, the yarn Y is divided into n sections, the linear density and blending ratio of each section of yarn Y are the same, but the linear densities or blending ratios of two adjacent sections are different; When drafting the i-th yarn Y, the linear speeds of the first back roller and the second back roller are V _h1i and V _h2i respectively, where i∈(1,2,...,n);

After the first component roving and the second component roving are drawn and twisted to form the i-th yarn Y, the blending ratios k _1i and k _2i can be expressed as follows:

The linear density of the i-th segment yarn Y is:

in, is the secondary draft ratio;

4) Assuming that the segment with the smallest linear density among the n segments of yarn Y is defined as the reference line segment, the reference linear density of this segment is ρ ₀ , and the reference linear speeds of the first rear roller and the second rear roller of this segment are respectively V _h10 and V _h20 ; the benchmark blending ratios of the first component roving and the second component roving in this section are k ₁₀ and k ₂₀ respectively

Keep the linear speed of the middle roller constant,

And V _z =V _h10 +V _h20 (5);

At the same time, let the secondary draft ratio constant;

Among them, the reference line speed V _h10 and V _h20 of the first back roller and the second back roller are advanced according to the material of the first component roving and the second component roving, the reference linear density ρ ₀ and the reference blending ratio k ₁₀ and k ₂₀ set up;

5) When drafting and blending the yarn Y of the i-th segment, under the premise of knowing the set linear density ρ _yi of the i-th segment and the set blending ratios k _1i and k _2i , calculate according to the formula (2)-(5) The linear speeds V _h1i and V _h2i of the first back roller and the second back roller;

6) On the basis of the reference line speeds V _h10 and V _h20 of the reference line segment, adjust the rotational speed of the first back roller and/or the second back roller to realize the online dynamics of the linear density or/and blending ratio of the i-th yarn Y Adjustment.

Further, assuming ρ ₁ =ρ ₂ =ρ, the formula (4) is simplified as:

According to formula (2), (3), (5) and (6), calculate the linear velocity V _h1i and V _h2i of described first rear roller and the second rear roller; On the basis of reference linear velocity V _h10 , V _h20 , increasing or decreasing the rotational speed of the first back roller and/or the second back roller to achieve the set i-th section yarn Y linear density or/and blending ratio.

Further, at the moment when the yarn Y is converted from the i-1 segment to the i segment, the linear density of the yarn Y is set to increase the dynamic increment Δρ _yi on the basis of the reference linear density, that is, the thickness occurs Δρ _yi ; When the linear speeds of the first rear roller and the second rear roller increase correspondingly on the basis of the reference linear speed, namely (V _h10 +V _h20 )→(V _h10 +ΔV _h1i +V _h20 +ΔV _h2i ), The increment of yarn Y linear density is:

Then the linear density _ρyi of the yarn Y can be expressed as follows:

Let ΔV _i = ΔV _h1i + ΔV _h2i , then (7) becomes:

The linear density change of the yarn Y is realized by controlling the sum ΔV _i of the linear speed increments of the first back roller and the second back roller.

Further, let ρ ₁ =ρ ₂ =ρ, then at the moment when yarn Y switches from section i-1 to section i, the blending ratio of yarn Y, that is, formulas (2) and (3) are simplified as:

The adjustment of the blending ratio of the yarn Y is realized by controlling the linear speed increment of the first back roller and the second back roller;

in,

ΔV _h1i =k _1i *(V _z +ΔV _i )-V _h10

ΔV _h2i =k _2i *(V _z +ΔV _i )−V _h20 .

Further, let V _h1i *ρ ₁ +V _h2i *ρ ₂ =H, H is a constant, then ΔV _i is always 0, thus, when the linear speed of the first back roller is increased or decreased through control, the linear velocity of the first back roller is simultaneously decreased or increased The linear speed of the second back roller realizes the adjustment of the blending ratio of the yarn Y while keeping the linear density constant.

Further, if one of ΔV _h1i and ΔV _h2i is zero, and the other is not zero, then one of the roving components in the yarn Y will be changed, while the other roving component will not change, and the adjusted The blending ratio is:

or,

Further, if both ΔV _h1i and ΔV _h2i are not zero, the change of the two roving components in the yarn Y is achieved, and the adjusted blending ratio is:

Further, if one of V _h1i or V _h2i is zero, and the other is not zero, the discontinuity of one roving component in the i-th yarn Y is achieved, that is, only one roving component is contained.

A device for spinning colorful slub and dotted yarns based on two-component two-stage drafting includes a control system and an actuator. mechanism; the secondary drafting mechanism includes a primary drafting unit and a secondary drafting unit; the primary drafting unit includes combined rear rollers and middle rollers; combined rear rollers include the same rear roller shaft arranged side by side The first rear roller and the second rear roller; the secondary drafting unit includes the front roller and the middle roller.

Furthermore, the control system mainly includes a PLC programmable controller, a servo driver, a servo motor, and the like.

Further, the first rear roller is fixedly arranged on the rear roller shaft, and the second rear roller is rotatably arranged on the rear roller shaft.

The dotted yarn, slub yarn, and color mixing produced by the method and device of the present invention are more uniform and accurate, and through the constant set speed rotation listed in the control, the blending effect is guaranteed to be more stable, even if the yarn color of different batches is different There will be no noticeable change. The following table is a comparison between the technical effect of the present invention and the prior art.

This shows that the technical effect of the present invention is remarkable.

Description of drawings

Fig. 1 is the schematic diagram of the principle of the secondary draft spinning device;

Fig. 2 is the schematic diagram of the structure of the combined back roller;

Fig. 3 is a structural side view of the secondary draft spinning device;

Fig. 4 is the traveling path diagram of yarn in secondary drafting in the embodiment;

Figure 5 is a schematic diagram of the structure of the control system.

Detailed ways

Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

A method for spinning multicolored slub yarns or dotted yarns based on two-component secondary drafting specifically includes:

1) As shown in Figure 1-4, the drafting and twisting system includes a first-level asynchronous drafting unit and a second-level synchronous drafting unit arranged front and rear;

2) The primary asynchronous drafting unit includes combined rear rollers and middle rollers; the secondary synchronous drafting unit includes front rollers 7 and middle rollers 5; combined rear rollers include first rear rollers arranged side by side on the same rear roller shaft 1 and the second rear roller 2; the first rear roller 1 and the second rear roller 2 move at the speed V _h1 and V _h2 respectively; the middle roller 5 rotates at the speed V _z ;

3 and 4 are the top rollers corresponding to each rear roller, 6 are the top rollers of the middle roller, and 8 are the corresponding top rollers of the front roller. Collector 9 is arranged between middle roller and combined back roller.

As shown in Figure 2, the first rear roller 2 is fixedly arranged on the rear roller shaft, and the gear or pulley 23 rotates to drive the first rear roller 2 to move; the second rear roller 1 is rotatably arranged on the rear roller shaft, and passes through the ring 21 drives it to rotate.

During spinning, the two roving strands 11 and 12 are positioned with the yarn guide bar and the support roller during the drafting and twisting process, and the first back roller 1 and the second back roller 2 will be moved at different speeds V _h1 and V _h2 The yarn is fed into the primary drafting zone, and the walking path of the yarn is shown in Figure 4. Parallel movement to the holding point of the middle roller and drawn out at the speed V _z , the two whiskers are respectively asynchronously affected by e _h1 = (V _z -V _h1 )/V _h1 , e _h2 = (V _z -V _h1 )/V _h1 After drafting, the linear densities of the strands are ρ ₁ ′ and ρ ₂ ′, respectively, and then enter the secondary drafting zone. Under the synchronous drafting effect of the front roller surface speed V _q , the linear densities of the two strands become ρ″ ₁ and ρ″ ₁ are twisted together to form a yarn.

As shown in Figure 5, the control system mainly includes PLC programmable controller, servo driver, servo motor and so on. The programmable controller controls the motor through the servo driver to drive the rollers, the program plate, the spindle and so on.

The front roller rotates with the surface linear velocity V _q ; the linear densities of the first roving component 11 and the second roving component 12 drafted by the first back roller and the second back roller are respectively ρ ₁ and ρ ₂ , the front roller The linear density of the yarn Y obtained after drafting and twisting is ρ _y ,

3) According to the set blending ratio and/or linear density, the yarn Y is divided into n sections, the linear density and blending ratio of each section of yarn Y are the same, but the linear densities or blending ratios of two adjacent sections are different; When drafting the i-th yarn Y, the linear speeds of the first back roller and the second back roller are V _h1i and V _h2i respectively, where i∈(1,2,...,n);

After the first component roving and the second component roving are drawn and twisted to form the i-th segment yarn Y, the blending ratios k _1i and k _2i can be expressed as follows:

The linear density of the i-th segment yarn Y is:

in, is the secondary draft ratio;

4) Assuming that the segment with the smallest linear density among the n segments of yarn Y is defined as the reference line segment, the reference linear density of this segment is ρ ₀ , and the reference linear speeds of the first rear roller and the second rear roller of this segment are respectively V _h10 and V _h20 ; the benchmark blending ratios of the first component roving and the second component roving in this section are k ₁₀ and k ₂₀ respectively

Keep the linear speed of the middle roller constant,

And V _z =V _h10 +V _h20 (5);

At the same time, let the secondary draft ratio constant;

Among them, the reference line speed V _h10 and V _h20 of the first back roller and the second back roller are advanced according to the material of the first component roving and the second component roving, the reference linear density ρ ₀ and the reference blending ratio k ₁₀ and k ₂₀ set up;

5) When drafting and blending the yarn Y of the i-th segment, under the premise of knowing the set linear density ρ _yi of the i-th segment and the set blending ratios k _1i and k _2i , calculate according to the formula (2)-(5) The linear speeds V _h1i and V _h2i of the first back roller and the second back roller;

6) On the basis of the reference line segment, adjust the rotational speed of the first back roller and/or the second back roller to realize online dynamic adjustment of the linear density or/and blending ratio of the i-th yarn Y.

Further, assuming ρ ₁ =ρ ₂ =ρ, the formula (4) is simplified as:

According to formula (2), (3), (5) and (6), calculate the line speed V _h1i and _{V h2i} of described first back roller and the second back roller; On the basis of ₁₀ and _k20 , increase or decrease the rotational speed of the first back roller and/or the second back roller to achieve the set i-th section yarn Y linear density or/and blending ratio.

7) At the moment when the yarn Y is converted from the i-1 segment to the i segment, the linear density of the yarn Y is set to increase the dynamic increment Δρ _yi on the basis of the reference linear density, that is, the thickness occurs Δρ _yi ; When the linear speeds of the first rear roller and the second rear roller increase correspondingly on the basis of the reference linear speed, namely (V _h10 +V _h20 )→(V _h10 +ΔV _h1i +V _h20 +ΔV _h2i ), The increment of yarn Y linear density is:

Then the linear density _ρyi of the yarn Y can be expressed as follows:

Let ΔV _i = ΔV _h1i + ΔV _h2i , then (7) becomes:

The linear density change of the yarn Y is realized by controlling the sum ΔV _i of the linear speed increments of the first back roller and the second back roller.

8) Let ρ ₁ =ρ ₂ =ρ, then at the instant when yarn Y is converted from section i-1 to section i, the blending ratio of yarn Y, that is, the formulas (2) and (3) are simplified as:

The adjustment of the blending ratio of the yarn Y is realized by controlling the linear speed increment of the first back roller and the second back roller;

in,

ΔV _h1i =k _1i *(V _z +ΔV _i )-V _h10

ΔV _h2i =k _2i *(V _z +ΔV _i )−V _h20 .

9) Let V _h1i *ρ ₁ +V _h2i *ρ ₂ =H, H is a constant, then ΔV _i is always 0, thus, when the linear speed of the first rear roller is increased or decreased by control, the linear velocity of the first rear roller is decreased or increased at the same time The linear speed of the second back roller realizes the adjustment of the blending ratio of the yarn Y while keeping the linear density constant.

10) make one of ΔV _h1i and ΔV _h2i zero, and the other one is not zero, then realize the change of one of the roving components in the yarn Y, while the other roving component does not change, the adjusted The blending ratio is:

or,

11) Make ΔV _h1i and ΔV _h2i both non-zero, then realize the change of the two kinds of roving components in the yarn Y, and the adjusted blending ratio is:

12) Let one of V _h1i or V _h2i be zero, while the other one is not zero, then realize the discontinuity of one roving component in the i-th segment yarn Y, that is, only contain one roving component.

Through the spinning device and process of the two-component separation and synchronous two-stage drafting of the present invention, which is combined and twisted into yarn, random online dynamic control of the changes in the linear density of the spinning yarn and the blending ratio can be realized, breaking through the original bamboo There are three technical bottlenecks in the process of knuckle yarn or dot yarn spinning: ① only the yarn density can be adjusted but not its blending ratio (or color change); ② the yarn pattern is single; ③ the pattern reproducibility is poor.

The above only describes several preferred embodiments of the present application in conjunction with the accompanying drawings, but the present application is not limited thereto, any improvement and/or deformation made by those skilled in the art without departing from the spirit of the present application shall belong to protection scope of this application.

Claims (7)

1. A method based on two-component secondary draft spinning multicolored slub or dotted yarn, is characterized in that, specifically comprises: 1) The drafting and twisting system includes a first-level asynchronous drafting unit and a second-level synchronous drafting unit arranged front and back; 2) The first-stage asynchronous drafting unit includes a combined rear roller and a middle roller; the combined rear roller includes a first rear roller and a second rear roller arranged side by side on the same rear roller shaft; the first rear roller and the second rear roller Respectively rotate at the linear speed V _h1 and V _h2 ; the first rear roller is fixed on the rear roller shaft, the gear or pulley rotates to drive the first rear roller to move, the second rear roller is rotatably arranged on the rear roller shaft, and passes through the ring The circle drives it to rotate; The secondary synchronous drafting unit includes a front roller and a middle roller; the middle roller rotates at a linear velocity _Vz ; the front roller rotates at a surface linear velocity Vq; the first rear roller and the second rear roller are drafted The linear densities of the first-component roving and the second-component roving are ρ ₁ and ρ ₂ respectively, and the linear density of the yarn Y obtained after drawing and twisting by the front roller is ρ _y , 3) According to the set blending ratio and/or linear density, the yarn Y is divided into n sections, the linear density and blending ratio of each section of yarn Y are the same, but the linear densities or blending ratios of two adjacent sections are different; When drafting the i-th yarn Y, the linear speeds of the first back roller and the second back roller are V _h1i and V _h2i respectively, where i∈(1,2,...,n); After the first component roving and the second component roving are drawn and twisted to form the i-th yarn Y, the blending ratios k _1i and k _2i can be expressed as follows: The linear density of the i-th segment yarn Y is: in, is the secondary draft ratio; 4) Assuming that the segment with the smallest linear density among the n segments of yarn Y is defined as the reference line segment, the reference linear density of this segment is ρ ₀ , and the reference linear speeds of the first rear roller and the second rear roller of this segment are respectively V _h10 and V _h20 ; the benchmark blending ratios of the first component roving and the second component roving of this section are k ₁₀ and k ₂₀ respectively; Keep the linear speed of the middle roller constant, And V _z =V _h10 +V _h20 (5); At the same time, let the secondary draft ratio constant; Among them, the reference line speed V _h10 and V _h20 of the first back roller and the second back roller are advanced according to the material of the first component roving and the second component roving, the reference linear density ρ ₀ and the reference blending ratio k ₁₀ and k ₂₀ set up; 5) When drafting and blending the yarn Y of the i-th segment, under the premise of knowing the set linear density ρ _yi of the i-th segment and the set blending ratios k _1i and k _2i , calculate according to the formula (2)-(5) The linear speeds V _h1i and V _h2i of the first back roller and the second back roller; 6) On the basis of the reference line segment, adjust the rotational speed of the first back roller and/or the second back roller to realize online dynamic adjustment of the linear density or/and blending ratio of the i-th yarn Y; At the moment when the yarn Y is converted from the i-1 segment to the i segment, the linear density of the yarn Y is increased on the basis of the reference linear density by a dynamic increment Δρ _yi , that is, the thickness occurs Δρ _yi ; for this reason, the first The linear speeds of the first rear roller and the second rear roller increase correspondingly on the basis of the reference linear speed, namely (V _h10 +V _h20 )→(V _h10 +ΔV _h1i +V _h20 +ΔV _h2i ), let ρ ₁ = ρ ₂ = ρ, then the increment of yarn Y linear density is: Then the linear density _ρyi of the yarn Y can be expressed as follows: Let ΔV _i = ΔV _h1i + ΔV _h2i , then (7) becomes: The linear density change of the yarn Y is realized by controlling the sum ΔV _i of the linear speed increments of the first back roller and the second back roller. 2. The method for spinning multicolored slub or dotted yarns as claimed in claim 1, characterized in that, if ρ ₁ =ρ ₂ =ρ, then the formula (4) is simplified as: According to formula (2), (3), (5) and (6), calculate the line speed V _h1i and _{V h2i} of described first back roller and the second back roller; On the basis of ₁₀ and _k20 , increase or decrease the rotational speed of the first back roller and/or the second back roller to achieve the set i-th section yarn Y linear density or/and blending ratio. 3. The method for spinning multicolored slub or dotted yarns as claimed in claim 1, characterized in that, if ρ ₁ =ρ ₂ =ρ, then at the moment when the yarn Y changes from the i-1th segment to the i-th segment , the blending ratio of yarn Y, that is, formulas (2) and (3) are simplified as: The adjustment of the blending ratio of the yarn Y is realized by controlling the linear speed increment of the first back roller and the second back roller; in, ΔV _h1i =k _1i *(V _z +ΔV _i )-V _h10 ΔV _h2i =k _2i *(V _z +ΔV _i )−V _h20 . 4. the method for spinning colorful slubs or dotted yarns as claimed in claim 1, is characterized in that, make V _h1i * ρ ₁ +V _h2i * ρ ₂ = H, H is a constant, then the first back roller and the second The sum of the linear velocity increments of the back rollers ΔV _i is constant to 0, thus, by controlling the increase or decrease of the linear velocity of the first rear roller, the linear velocity of the second rear roller is simultaneously decreased or increased to realize the The blending ratio of yarn Y is adjusted while keeping the linear density constant. 5. The method for spinning multicolored slubs or dotted yarns as claimed in claim 3, wherein one of ΔV _h1i and ΔV _h2i is zero, and the other is not zero, then one of the yarns Y is realized. The change of described roving component, and another kind of roving component does not change, and the blending ratio after adjustment is: or, 6. the method for spinning multicolored slubs or dotted yarns as claimed in claim 5, is characterized in that, if ΔV _h1i and ΔV _h2i are not zero, then the two kinds of roving components in the yarn Y are achieved. Change, the adjusted blending ratio is: 7. The method for spinning multicolored slubs or dotted yarns as claimed in claim 6, wherein one of V _h1i or V _h2i is zero, and the other one is not zero, then the ith section yarn Y is realized The discontinuity of one roving component, that is, containing only one roving component.