EP3327185B1

EP3327185B1 - Rotor spinning method and apparatus using three-cotton-sliver asynchronous input and multi-stage carding

Info

Publication number: EP3327185B1
Application number: EP15901886.0A
Authority: EP
Inventors: Yuan XUE; Weidong Gao; Ruihua YANG; Mingrui GUO
Original assignee: Jiangnan University
Current assignee: Jiangnan University
Priority date: 2015-08-21
Filing date: 2015-10-30
Publication date: 2019-07-24
Anticipated expiration: 2035-10-30
Also published as: EP3327185A1; EP3327185A4; CN105063821B; CN105063821A; WO2017031612A1

Description

TECHNICAL FIELD

The present invention relates the field of rotor spinning in the textile industry.

BACKGROUND

The basic principle of the rotor spinning yarn is that the sliver is fed through the trumpet and is held by feeding plate and feeding roller. The feeding roller rotates to feed the sliver to the carding area. The sliver is opened and stripped, carded separately and mixed by the carding roller, which rotates at a high speed in the carding area, so that the sliver becomes single fibers which are separated and arranged parallel to each other. The single fibers enter into a fiber transport channel. Under the action of air flow, the fiber flows into the rotor through the fiber transport channel. Under the centrifugal force of the rapidly rotating rotor, the fibers in the collection groove are further piled up and mixed, and then the fibers are jointed with the mother-yarn and twisted by a navel to form a yarn.
In the Patent "Rotor spinning melange yarn forming method and device and product (Application No. CN201410190891.1 )" and "Device of spinning rotor spun melange yarn( CN201420229715.X )", the speed of the feeding roller is controlled to keep feeding in an invariable amount, or two or more drafted slivers are fed in segments in different amounts, resulting in that the blending ratio has monochromatic or mixture of multi-colored fibers, so as to achieve an effect that the blending ratio can be adjusted while the density of the spun yarn is invariable. However, these two inventions have two problems. First, in these inventions, only the concept of realizing the blending and segment-color spinning process with invariable linear density through the proposed coupling and drafting method, and no indication is given to show how to change the mixing ratio or color blending ratio under the condition that the coupling and drafting achieves an invariable linear density. In the meantime, no specific embodiments and examples are disclosed. Second, a conventional single carding roller is still used in those patent applications. When three slivers are fed at the same time, the original carding and drafting system cannot adequately strip, card, separate and mix a plurality of slivers, which will cause inadequate break down of fiber strands, resulting in blocking the carding roller and rotor, and will be prone to yarn broken and slub, nep and other defects. At the same time, although the total amount of each sliver by coupling and feeding is invariable, there is still a difference in the feeding amount of each sliver, and the short carding area causes little chance of horizontal fiber mixing, resulting in unsatisfactory color blending effect.
At present, the patent "Method and equipment for rotor spun slub yarn " (patent number CN00137211.4 ) can achieve invariable blending ratio but the linear density changes during the rotor spinning process. The principle of the patent is that the asynchronous motor and the stepper motor drive feeding roller through the differential, screw and worm wheel. The stepper motor, under the control of the intelligent controller, performs the following operations: reducing from high speed to low speed; continuing to run for a period of time; accelerating to high speed; continuing to run for a period of time, and the rotor spins a segment of slub yarn. The patent can produce a yarn with variable densities but cannot change blending ratios of the yarn.
The production of the yarn with the linear density and blending ratio both changed requires not only that the feeding amount of the two or more of the fed roving can be controlled separately on line, but also that the total amount of the fed roving can be controlled when the feeding amount of the roving is changed. There is no prior art that discloses the production of such yarn. The main problem of the existing rotor spinning technology which can produce the yarn having an invariable linear density and blending ratio is that it is impossible to blend two or more fibers in any proportion during the rotor spinning process.
The following patent/patent application documents relate to rotor spinning method:

D1 CN103938322 A , is to provide a rotor spun yarn blending method, using the same or different, and two or more fiber strands are fed at the same feed speed or a different location in the same straight line density carding and twisting means, by opening, carding, mixed, agglomerated with twisted, made of color segments or rotor spinning yarn segment color mixing.
D2 CN104762713 A , relates to a three-ingredient asynchronous/synchronous draft yarn linear density and blending ratio regulating and controlling method and device.
D3 EP 1564318 A2 , relates to the method of sliver feeding in production of fancy yarn on spindle-less rotor machines with sliver feeding by a feed roller to the stripping roller, stripping individual fibres from the sliver that are consequently used at the spinning rotor for yarn spinning plus spinning units for this method performance.
D4 EP 1352998 A2 , relates to a feed roller for a spinning apparatus with a work area for providing a first textile material for a spinning element as well as an opening device for a spinning apparatus having a rotatably mounted in a housing opening roller and a feed device for feeding a sliver to the opening roller.

SUMAARY OF THE INVENTION

In order to solve the above problem, the present invention improves the structure of the conventional rotor spinning machine. A device for implementing a rotor spinning method with multi-level carding and multi-component feeding, includes a spinning system and a computer control system. The spinning system comprises a feeding and carding mechanism, a collecting and twisting mechanism, and a winding and forming mechanism. The device is characterized in that the feeding and carding mechanism comprises a multi-level carding roller and a combined feeding roller having three rotation freedom degrees. The speed ratio of the three combined feeding rollers with rotational freedom degree can be adjusted. The collecting and twisting mechanism includes a fiber transport channel, a rotor, and a yarn guider. The winding and forming mechanism includes a couple of guide roller and winding mechanism. The computer control system includes a PLC programmable controller, a servo driver and a servo motor. The three combined feeding rollers with rotation freedom degrees and the multi-level carding roller are driven by the servo motor. The combined feeding rollers with three rotational freedom degrees comprises a shaft, a bearing, a hollow shaft, a first gear, a second gear, a third gear, a washer, a first movable roller, a second movable roller, and a third movable roller. The first gear, the second gear, the third gear, the first movable roller, the second movable roller, and the third movable roller rotate around the same axis. The first to the third gears respectively drive the first to the third movable rollers. The multi-level carding roller comprises the first carding roller, the second carding roller and the third roller that are arranged in parallel. The rotation speed of the multi-level carding roller is progressively increased from the first level to the third level. The rotation speed of the first carding roller is 1500-3000 rpm, the rotation speed of the second carding roller is 3000-6000 rpm, and the rotation speed of the third carding roller is 6000-12000 rpm. The density of carding needles of the multi-level carding roller progressively increases from the first carding roller to the third carding roller.
The other objective of the present invention is to provide a rotor spinning method using the above device. The method includes feeding, carding, collecting and twisting, guide and winding. The method is characterized in that combined feeding rollers with three rotational freedom degrees are used in the fiber feeding to feed the fiber into the carding area asynchronously, and multi-level carding roller is used in the carding process.
With the combined rollers and the multi-level carding roller configured in the present invention, three slivers (or three different raw material slivers, or three kinds of colored slivers, hereinafter referred to as three components) can be asynchronously fed into the rotor spinning and carding area through the combined feeding rollers. After opening, carding, orienting, separating and mixing, by the multi-level carding roller, the three slivers are gradually combed into bundle fibers and further combed into single fibers. Under the action of centrifugal force and air flow, a continuous flow comprised by single fibers released and transferred from the carding roller enters into the rotor rotating at a high speed. In the rotor, the fiber flow, under the centrifugal force, is collected together into a sliver again, and then twisted by the navel, and then guided by the guide roller to form the rotor spinning yarn. In the process of spinning, the servo driving system is controlled by a computer program to feed three slivers asynchronously to the carding area by feeding rollers having three freedom degrees. By controlling the feeding amount and feeding ratio of the three feeding rollers, it is possible to dynamically configure the final yarn density of the rotor spinning and the blending ratio of the three components to produce slub yarn, segment-color yarn, segment-color slub yarn, and mélange yarn.
The speed of the first carding roller is low, so that it is ensured that when the plurality of the slivers with great difference are fed, the total number of carding fibers of each sliver carded by the carding roller are within a reasonable range, thereby reducing damage to the fiber. The speed of the second carding roller is higher than that of the first carding roller. After being carded by the second carding roller, the longitudinal orientation of the fiber is optimized, horizontal transfer mixing of the fiber is further optimized. The third carding roller is a high-speed carding roller. The fiber, after being carded by the third carding roller, obtains not only a better carding and transfer, but also the transport speed is improved, thereby meeting the requirement of centrifugal force for entering the fiber transport channel. Therefore, the fiber can smoothly and orderly go into the rotor to form yarns. Through the multi-level stripping, opening, cleaning, carding separating, and transferring, the large-scale drafting function where the slivers are combed into web, which is then combed into bundles of fibers, which are then separated into as single fibers is successfully completed, which enhances the function of the carding area of the rotor spinning, providing flexibility, high efficiency, and high yield.
(2) Based on the mechanical innovation design, the present invention constructs the corresponding mathematical model of spinning and the algorithm of the program. Through the mechatronic servo control system, the random control of the linear density and blending ratio of the rotor spinning yarn are achieved. In specific embodiments, the three kinds of spinning yarns are shown as following:

① a yarn with invariable linear density and variable blending ratio, such as gradient-color or segment-color yarn with an invariable linear density segment;
② a yarn with invariable blending ratio and variable linear density, such as slub yarn, big-belly yarn, dot yarn;
③ a yarn with variable linear density and variable blending ratio, such as segment-color slub yarn, segment-color big-belly yarn, segment-color dot yarn;
④ a yarn with invariable linear density and invariable blending ratio but mixed with any proportion of blended yarn or color-mixed yarn.

BRIEF DESCRIPTION OF THE DRAFTINGS

FIG.1 is a flowchart of the rotor spinning.
FIG.2 is a diagram of the carding and drafting process of the rotor spinning method with three-level carding roller.
FIG.3 is a diagram showing the transmission of the feeding roller, wherein 3b is the right-side view of 3a.
FIG.4 is a structural view of the combined feeding roller.
FIG.5 is a diagram of a spinning control system with three components asynchronous fed and carded.
FIG.6 is a diagram of a control model of a rotor spinning yarn system with three components asynchronous input.
- 1-1, 1-2, 1-3: carding roller; 1-4, 1-5: trash ejection port; 1-6: feeding roller; 1-7: sliver; 1-8: compression spring; 1-9: feeding plate; 1-10: fiber transport channel; 1-11: navel; 1-12: rotor; 1-13: degassing hole; 1-14, 1-15: guide roller, 1-16: yarn;
- 2-4, 2-5, 2-6: feeding roller; 2-1, 2-2, 2-3: sliver; 2-7: feeding plate; 2-8, 2-9, 2-10: carding roller; 2-11: fiber flow; 2-12: rotor; 2-13: yarn;
- 3a-1, 3a-4, 3a-5: rollers; 3a-2, 3a-9, 3a-10: gears; 3a-3, 3a-6, 3a-7: idler gear; 3a-8: roller shaft; 3a-11, 3a-12, 3a-13: carding roller, 3a-14: spun yarn, in FIG. 3b, 3b-1: gear; 3b-2: roller; 3b-3, 3b-4, 3b-5: gears;
- 4-1, 4-10: bearing; 4-2: hollow shaft; 4-3, 4-9, 4-11: gears; 4-4, 4-8: washer; 4-5, 4-6, 4-7: roller; 4-12: shaft; rollers (4-5, 4-6, 4-7) are driven by the gears (4-3, 4-9, 4-11), respectively.

DETAILED DESCRIPTION OF THE INVENTION

The meaning of the formula used in the text:

V₀₁: linear velocity of the feeding roller 1; V₀₂: linear velocity of the feeding roller 2; V₀₃: linear velocity of the feeding roller 3; V₁: the linear velocity of the carding roller 1; V₂: the linear velocity of the carding roller 2; V₃: the linear velocity of the carding roller 3; V₄: the linear speed of the rotor; V₅: the linear velocity of the guide roller.
ρ₁: linear density of sliver A (g / m)
ρ₂: linear density of sliver B (g / m)
ρ₃: linear density of sliver C (g / m)
ρ: yarn density (g / m);

ρ₁₁: linear density of the sliver A passing through the carding roller 1 (g / m)
ρ₁₂: linear density of the sliver A passing through the carding roller 2 (g / m)
ρ₁₃: linear density of the sliver A passing through the carding roller 3 (g / m)
ρ₁₄: linear density of the sliver A in the rotor (g / m)

ρ₂₁: linear density of the sliver B passing through the carding roller 1 (g / m)
ρ₂₂: linear density of the sliver B passing through the carding roller 2 (g / m)
ρ₂₃: linear density of the sliver B passing through the carding roller 3 (g / m)
ρ₂₄: linear density of the sliver B in the rotor (g / m)

ρ₃₁: linear density of the sliver C passing through the carding roller 1 (g / m)
ρ₃₂: linear density of the sliver C passing through the carding roller 2 (g / m)
ρ₃₃: linear density of the sliver C passing through the carding roller 3 (g / m)
ρ₃₄: sliver C linear density in the rotor (g / m)

E₁: draft ratio of the carding roller 1 to the feeding roller;
E₂: draft ratio of the carding roller 2 to the carding roller 1;
E₃: draft ratio of the carding roller 3 to the carding roller 2;
E₄: draft ratio of the rotor to the carding roller 3;
E₅: draft ratio of the guide roller to the rotor;
E: total draft ratio of rotor spinning, which is equal to the draft ratio of r guide roller to feeding roller.

Subscripts 1, 2, 3, represent component A, component B, component C, respectively.

(1) three-level roller carding process design:

As to feeding a plurality of the slivers, when the feeding speeds of feeding rollers are greatly different, the fiber holding time of each component is also greatly different. In the rotor spinning with single carding roller, due to the need of balancing the stripping/carding fibers, as well as the requirement of the fiber speed when transferring to the fiber transport channel, the rotation speed of the single carding roller is high. Therefore, when there is a significant difference in feeding amount, the number of times that a fiber of the three slivers is carded will be significantly different, and the more the fiber experiences carding, larger will be the damage to this fiber.
In order to solve the problem of the rotation speed of the carding roller against the damage to fiber and the even mixture of fibers, the present invention adopts the form of three-level carding rollers, that is, the first carding roller, the second carding roller and the third carding roller. The rotation speed of the first carding roller (ω = 1500-3000rpm) is relatively low; the needle density is also relatively low; the working angle of the needle is relatively small. It is mainly configured for stripping, opening, cleaning, carding, and focusing on making the total carding number of fibers of each sliver within a reasonable range, thereby reducing damage to the fiber. The speed of the second carding roller (ω = 3000-6000rpm) is mainly configured for stripping, carding and transferring fibers, wherein the needle density is larger than the needle density of the first carding roller, and the working angle of the needle is relatively larger than that of the first carding roller. After being carded by the second carding roller, the longitudinal orientation of the fiber is optimized, and horizontal transfer mixing of the fiber is further optimized. The third carding roller is a high-speed carding roller (ω =6000-12000 rpm), which is mainly configured for stripping, carding and separating and transferring fibers, wherein the needle density is larger than the needle density of the second carding roller, and the working angle of the needle is largest. Fibers passing through the third carding roller get better carding and transferred. Furthermore, due to the high speed of the third carding roller, under the action of centrifugal force and air flow, a highly separated and continuous fiber flow passes through the fiber transport channel and enters orderly into the rotor to form yarns.
Through the stripping, opening, cleaning, carding, and transfer of the three-level carding roller, the large-scale drafting function, where the slivers are combed into web, which is then combed into fiber bundles which are separated into single fibers, is successful completed, which enhances the function of the carding area of the rotor spinning, meets the special requirements for the carding of multiple slivers asynchronously feeding into the rotor spun unit. The effects of flexibility, high efficiency, and high yield are realized.

(2) Draft ratio of the rotor spun yarn:

$E_{1} = \frac{(ρ_{1} + ρ_{2} + ρ_{3}) V_{1}}{ρ_{1} V_{01} + ρ_{2} V_{02} + ρ_{3} V_{03}} = \frac{ρ_{1} + ρ_{2} + ρ_{3}}{ρ_{11} + ρ_{21} + ρ_{31}}$
$E_{2} = \frac{V_{2}}{V_{1}} = \frac{ρ_{11} + ρ_{21} + ρ_{31}}{ρ_{12} + ρ_{22} + ρ_{32}}$
$E_{3} = \frac{V_{3}}{V_{2}} = \frac{ρ_{12} + ρ_{22} + ρ_{32}}{ρ_{13} + ρ_{23} + ρ_{33}}$
$E_{4} = \frac{V_{4}}{V_{3}} = \frac{ρ_{13} + ρ_{23} + ρ_{33}}{ρ_{14} + ρ_{24} + ρ_{34}}$
$E_{5} = \frac{V_{5}}{V_{4}} = \frac{ρ_{14} + ρ_{24} + ρ_{34}}{ρ}$
$E = E_{1} * E_{2} * E_{3} * E_{4} * E_{5} = \frac{(ρ_{1} + ρ_{2} + ρ_{3}) V_{5}}{ρ_{1} V_{01} + ρ_{2} V_{02} + ρ_{3} V_{03}} = \frac{ρ_{1} + ρ_{2} + ρ_{3}}{ρ}$
$E = \frac{(ρ_{1} + ρ_{2} + ρ_{3}) V_{5}}{ρ_{1} V_{01} + ρ_{2} V_{02} + ρ_{3} V_{03}} = \frac{ρ_{1} + ρ_{2} + ρ_{3}}{ρ}$

(3) The linear density of rotor spun yarn

$ρ = \frac{ρ_{1} V_{01} + ρ_{2} V_{02} + ρ_{3} V_{03}}{V_{5}}$

(4) Blending ratio

The blending ratios of components A, B, C in the rotor spinning yarn are K₁, K₂ and K₃ respectively, then $K_{1} = \frac{ρ_{1} V_{01}}{ρ_{1} V_{01} + ρ_{2} V_{02} + ρ_{3} V_{03}}$
$K_{2} = \frac{ρ_{2} V_{02}}{ρ_{1} V_{01} + ρ_{2} V_{02} + ρ_{3} V_{03}}$
$K_{3} = \frac{ρ_{3} V_{03}}{ρ_{1} V_{01} + ρ_{2} V_{02} + ρ_{3} V_{03}}$

(4) Dynamic linear density of rotor spun yarn

Assuming that the speed V₅ of the guide roller is invariable, the variables of feeding speed V₀₁, V₀₂, and V₀₃ of the feeding rollers are respectively as follows: $V_{01}' = V_{01} + {ΔV}_{01}$
$V_{02}' = V_{02} + {ΔV}_{02}$
$V_{03}' = V_{03} + {ΔV}_{03}$
So that the new changed linear density of the rotor spun yarn is $\begin{array}{l} ρ' = \frac{ρ_{1} (V_{01} + Δ V_{01}) + ρ_{2} (V_{02} + Δ V_{02}) + ρ_{3} (V_{03} + Δ V_{03})}{V_{5}} \\ = \frac{ρ_{1} V_{01} + ρ_{2} V_{02} + ρ_{3} V_{03}}{V_{5}} + \frac{ρ_{1} Δ V_{01} + ρ_{2} Δ V_{02} + ρ_{3} Δ V_{03}}{V_{5}} \end{array}$
$Δρ = \frac{ρ_{1} Δ V_{01} + ρ_{2} Δ V_{02} + ρ_{3} Δ V_{03}}{V_{5}}$

(5) Dynamic blending ratios of the rotor spun yarn are:

Assuming that: ρ₁ = ρ₂ = ρ₃ = ρ₀ $V_{01} = V_{02} + V_{03} = V_{0}$
Reference blending ratios are shown as below: $K_{1} = \frac{V_{01}}{V_{0}}$
$K_{2} = \frac{V_{02}}{V_{0}}$
$K_{3} = \frac{V_{03}}{V_{0}}$
When V₀₁+V₀₂+V₀₃→V₀₁+ΔV₀₁+V₀₂+ΔV₀₂+V₀₃+ΔV₀₃, the blending ratios become as below: $K_{1}' = \frac{V_{01} + Δ V_{01}}{V_{0} + Δ V_{0}}$
$K_{2}' = \frac{V_{02} + Δ V_{01}}{V_{0} + Δ V_{0}}$
$K_{3}' = \frac{V_{03} + Δ V_{03}}{V_{0} + Δ V_{0}}$
Mixed configuration is gradient to realize different color scheme.

By changing V₀₁, V₀₂ and V₀₃, the blending ratio (color mixing ratio) of different fibers (different colors) in the yarn can be changed under the condition that V₀ is kept invariable, so that k₁, k₂ and k₃ are changed between 0 - 100%. In various color mixing modes of three primary colors, the minimum increment of the color mixing ratio is 0.1, wherein one of the color schemes is as follows:

Table 1 color scheme

		color A color mixing ratio k₁	color A color mixing ratio k₂	color A color mixing ratio k₃	Color Code
monochrome	Color A		1	0	0	1
	Color B	0	1	0	2
	Color C	0	0	1	3
Double mixed color	AB	0.1	0.9	0	4
		0.2	0.8	0	5
		0.3	0.7	0	6
		0.4	0.6	0	7
		0.5	0.5	0	8
		0.6	0.4	0	9
		0.7	0.3	0	10
		0.8	0.2	0	11
		0.9	0.1	0	12
Double mixed color	AB	0.1	0	0.9	13
		0.2	0	0.8	14
		0.3	0	0.7	15
		0.4	0	0.6	16
		0.5	0	0.5	17
		0.6	0	0.4	18
		0.7	0	0.3	19
		0.8	0	0.2	20
		0.9	0	0.1	21
Double mixed color	AB	0	0.1	0.9	22
		0	0.2	0.8	23
		0	0.3	0.7	24
		0	0.4	0.6	25
		0	0.5	0.5	26
		0	0.6	0.4	27
		0	0.7	0.3	28
		0	0.8	0.2	29
		0	0.9	0.1	30
Three mixed color	ABC	0.1	0.8	0.1	31
		0.2	0.7	0.1	32
		0.3	0.6	0.1	33
		0.4	0.5	0.1	34
		0.5	0.4	0.1	35
		0.6	0.3	0.1	36
		0.7	0.2	0.1	37
		0.8	0.1	0.1	38

Note: k₁+k₂+k₃ = 100% can have numerous combinations. Based on the three primary colors (three kinds of color slivers) by coupling and drafting, color alternating, gradient color matching, twisting and mixture, numerous color schemes can be formed. In addition, it is possible to form a segment-color yarn having a variety of color distribution in the yarn.

(6) Random dynamic control method of the density and blending ratio of the rotor spun yarn

The dynamic change rate of density of the rotor spun yarn is shown as below: $\begin{array}{l} \in_{ρ} = \frac{Δρ}{ρ} = \frac{\frac{ρ_{1} {ΔV}_{01} + ρ_{2} Δ V_{02} + ρ_{3} Δ V_{03}}{V_{5}}}{\frac{ρ_{1} V_{01} + ρ_{2} V_{02} + ρ_{3} V_{03}}{V_{5}}} \\ = \frac{ρ_{1} Δ V_{01} + ρ_{2} Δ V_{02} + ρ_{3} Δ V_{03}}{ρ_{1} V_{01} + ρ_{2} V_{02} + ρ_{3} V_{03}} \end{array}$
and: $ρ_{1} = ρ_{2} = ρ_{3} = ρ_{0}$
$V_{01} + V_{02} + V_{03} = V$
Then, $\begin{array}{l} \in_{ρ} = \frac{Δ V_{01} + Δ V_{02} + Δ V_{03}}{V_{0}} \\ = \frac{Δ V_{0}}{V_{0}} \end{array}$
From the absolute increment of the linear density and relative increment of the linear density, it can be found that, the linear density change of the yarn, which depends entirely on the V₀₁+ΔV₀₁, V₀₂+ΔV₀₂, V₀₃+ΔV₀₃, can have 7 different patterns. Therefore, there can be 7 kinds of yarn in different forms.

① A yarn with variable linear density, wherein one component of the yarn has variable linear density and two components of the yarn have invariable linear densities. $ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * (V_{01} + V_{02} + V_{03} + {ΔV}_{03}),$
or $ρ' = ρ + Δρ = \frac{ρ}{v_{o}} * (V_{01} + V_{02} + V_{03} + {ΔV}_{02})$
or $ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * (V_{01} + V_{02} + V_{03} + {ΔV}_{01})$
② A yarn with variable linear density, wherein two components of the yarn have variable linear densities and one component of the yarn has invariable linear densities. $ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [V_{01} + V_{02} + V_{03} + ({ΔV}_{01} + {ΔV}_{02})],$
or $ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [V_{01} + V_{02} + V_{03} + ({ΔV}_{02} + {ΔV}_{03})]$
or $ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [V_{01} + V_{02} + V_{03} + ({ΔV}_{01} + {ΔV}_{03})]$
③ A yarn with variable linear density, wherein three components of the yarn have variable linear densities. $ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [V_{01} + V_{02} + V_{03} + ({ΔV}_{01} + {ΔV}_{02} + {ΔV}_{03})],$
④ A yarn with variable linear density, wherein one continuous component and three discontinuous components: $\begin{array}{l} ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [(V_{01} + {ΔV}_{01}) + (V_{02} + {ΔV}_{02}) + (V_{03} + {ΔV}_{03})] \\ (0 \leq t \leq T_{1}) \end{array}$
$ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [(V_{02} + {ΔV}_{02})] (T_{1} \leq t \leq T_{2})$
$\begin{array}{l} ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [(V_{01} + {ΔV}_{01}) + (V_{02} + {ΔV}_{02}) + (V_{03} + {ΔV}_{03})] \\ (T_{2} \leq t \leq T_{3}) \end{array}$
$ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [(V_{02} + {ΔV}_{02})] (T_{3} \leq t \leq T_{4}),$
⑤ A yarn with variable linear density, wherein two components are continuous and one component is discontinuous, wherein t, T1, T2, T3 and T4 represent time. $\begin{array}{l} ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [(V_{01} + {ΔV}_{01}) + (V_{02} + {ΔV}_{02}) + (V_{03} + {ΔV}_{03})] \\ (0 \leq t \leq T_{1}) \end{array}$
$ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [(V_{01} + {ΔV}_{01}) + (V_{02} + {ΔV}_{02})] (T_{1} \leq t \leq T_{2})$
$ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [(V_{01} + {ΔV}_{01}) + (V_{02} + {ΔV}_{02}) + (V_{03} + {ΔV}_{03})] (T_{2} \leq t \leq T_{3})$
$ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [(V_{01} + {ΔV}_{01}) + (V_{02} + {ΔV}_{02})] (T_{3} \leq t \leq T_{4})$
⑥ A yarn with variable linear density, wherein three components are continuous but the linear density of the yarn is variable: $ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [(V_{01} + {ΔV}_{01}) + (V_{02} + {ΔV}_{02}) + (V_{03} + {ΔV}_{03})]$
⑦ The method of dynamic feeding speed control of the spun yarn, $Since Δ_{V 0} = {ΔV}_{01} + {ΔV}_{02} + {ΔV}_{03},$

₀₁

₀₂

₀₃

{ΔV}_{01} = K'_{1} (V_{0} + ΔV) - V_{01},

{ΔV}_{02} = K'_{2} (V_{0} + ΔV) - V_{02},

{ΔV}_{03} = K'_{3} (V_{0} + ΔV) - V_{03} .

Claims

A rotor spinning method for three-sliver asynchronous inputting and three-level carding, comprising:
1) feeding fiber (2-11) by a combined feeding roller comprising three feeding rollers (2-4, 2-5, 2-6) with three rotational freedom degrees into carding area, wherein a three-level carding roller comprising three carding rollers (2-8, 2-9, 2-10) is used for carding;

2) moving the three feeding rollers (2-4, 2-5, 2-6) at linear speeds V₀₁, V₀₂ and V₀₃, respectively; moving a rotor (2-12) at a linear speed V₄ and moving a guide roller (1-14,1-15) at a linear speed V₅; setting linear densities of three slivers (2-1, 2-2, 2-3) drafted by the three feeding rollers (2-4, 2-5, 2-6) to be ρ₁, ρ₂, and ρ₃, respectively, and setting the rotor spun yarn density to be ρ, such that a draft ratio of a rotor spinning yarn (2-13) is as below: $E = \frac{(ρ_{1} + ρ_{2} + ρ_{3}) V_{5}}{ρ_{1} V_{01} + ρ_{2} V_{02} + ρ_{3} V_{03}} = \frac{ρ_{1} + ρ_{2} + ρ_{3}}{ρ}$
a linear density of the rotor spun yarn is formed, $ρ = \frac{ρ_{1} V_{01} + ρ_{2} V_{02} + ρ_{3} V_{03}}{V_{5}}$
wherein speeds of three carding rollers (2-8, 2-9, 2-10) are as follows: a speed of a first carding roller (2-8) is 1500-3000 rpm, a speed of a second carding roller (2-9) is 3000-6000 rpm, a speed of a third carding roller (2-10) is 6000-12000 rpm,

3) blending ratios of the three slivers (2-1, 2-2, 2-3) in the rotor spinning yarn are K1, K2, K3, respectively: $K_{1} = \frac{ρ_{1} V_{01}}{ρ_{1} V_{01} + ρ_{2} V_{02} + ρ_{3} V_{03}}$
$K_{2} = \frac{ρ_{2} V_{02}}{ρ_{1} V_{01} + ρ_{2} V_{02} + ρ_{3} V_{03}}$
$K_{3} = \frac{ρ_{3} V_{03}}{ρ_{1} V_{01} + ρ_{2} V_{02} + ρ_{3} V_{03}}$

4) assuming that the speed V₅ of the guide roller r is invariable, the variables of feeding speeds V₀₁, V₀₂, V₀₃ of the three feeding rollers (2-4, 2-5, 2-6) of the three slivers (2-1, 2-2, 2-3) are respectively as follows: V₀₁' = V₀₁ + ΔV₀₁, V₀₂' = V₀₂ + ΔV₀₂, V₀₃' = V₀₃ + ΔV₀₃, then the dynamic linear density of the rotor spun yarn (2-13) is obtained according to formula (6) $Δρ = \frac{ρ_{2} Δ V_{02} + ρ_{2} Δ V_{02} + ρ_{3} Δ V_{03}}{V_{5}}$

5) assuming that ρ₁ = ρ₂ = ρ₃ = ρ₀, V₀₁+V₀₂+V₀₃ = V₀, obtaining a reference blending ratio according to the formulas (3), (4), (5) as, $K_{1} = \frac{V_{01}}{V_{0}},$
$K_{2} = \frac{V_{02}}{V_{0}},$
$K_{3} = \frac{V_{03}}{V_{0}},$
wherein, when V₀₁+V₀₂+V₀₃→V₀₁+ΔV₀₁+V₀₂+ΔV₀₂+V₀₃+ΔV₀₃, the blending ratio becomes as below: $K_{1}' = \frac{V_{01} + Δ V_{01}}{V_{0} + {ΔV}_{0}}$
$K_{2}' = \frac{V_{02} + Δ V_{02}}{V_{0} + Δ V_{0}}$
$K_{3}' = \frac{V_{03} + Δ V_{03}}{V_{0} + Δ V_{0}}$
Realizing dynamically adjustable spinning of different color blending ratios or color mixing ratios in the yarn with different fibers or colors by controlling of V₀₁, V₀₂, V₀₃.
The method according to claim 1, characterized in that: assuming ρ₁ = ρ₂ = ρ₃ = ρ₀, V₀₁ + V₀₂ + V₀₃ = V₀, obtaining a dynamic change rate of the rotor spun yarn density according to formulas (2) and (6): $ε_{ρ} = \frac{Δ V_{01} + Δ V_{02} + Δ V_{03}}{V_{0}} = \frac{Δ V_{0}}{V_{0}}$
achieving a random dynamic regulation of the linear density and the blending ratio of the rotor spun yarn by controlling the speed of three feeding rollers (2-4, 2-5, 2-6).
The method according to claim 2, characterized in that: $ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * (V_{01} + V_{02} + V_{03} + {ΔV}_{03}),$
or $ρ' = ρ + Δρ = \frac{ρ}{v_{o}} * (V_{01} + V_{02} + V_{03} + {ΔV}_{02})$
or $ρ' = ρ + Δρ= \frac{ρ}{V_{0}} * (V_{01} + V_{02} + V_{03} + {ΔV}_{01})$
changing speed of one of the three feeding rollers (2-4, 2-5, 2-6) to achieve a yarn with variable linear density, wherein one component has variable linear density and two components have invariable linear densities.
The method according to claim 2, characterized in that: $ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [V_{01} + V_{02} + V_{03} + ({ΔV}_{01} + {ΔV}_{02})],$
or $ρ' = ρ + Δρ = \frac{ρ}{v_{0}} * [V_{01} + V_{02} + V_{03} + (Δ V_{02} + Δ V_{03})]$
or $ρ' = ρ + Δρ = \frac{ρ}{v_{o}} * [V_{01} + V_{02} + V_{03} + ({ΔV}_{01} + {ΔV}_{03})]$
changing speed of two of the three feeding rollers (2-4, 2-5, 2-6) to achieve a yarn with variable linear density, wherein two components have variable linear densities and one component has invariable linear densities.
The method according to claim 2, characterized in that: $ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [V_{01} + V_{02} + V_{03} + ({ΔV}_{01} {+ΔV}_{02} + {ΔV}_{03})],$
changing speed of three of the three feeding rollers (2-4, 2-5, 2-6) to achieve yarn with variable linear density, wherein three components have variable linear densities.
The method according to claim 2, characterized in that: $\begin{array}{l} ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [(V_{01} + {ΔV}_{01}) + (V_{02} + {ΔV}_{02}) + (V_{03} + {ΔV}_{03})] \\ (0 \leq t \leq T_{1}) \end{array}$
$\begin{matrix} ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [(V_{02} + {ΔV}_{02})] & (T_{1} \leq t \leq T_{2}) \end{matrix}$
$\begin{array}{l} ρ' = ρ + Δρ= \frac{ρ}{V_{0}} * [(V_{01} + {ΔV}_{01}) + (V_{02} + {ΔV}_{02}) + (V_{03} + {ΔV}_{03})] \\ (T_{2} \leq t \leq T_{3}) \end{array}$
$\begin{matrix} ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [(V_{02} + {ΔV}_{02})] & (T_{3} \leq t \leq T_{4}) \end{matrix},$
wherein speed change of the three feeding rollers (2-4, 2-5, 2-6) and speed change of one roller of the three feeding rollers (2-4, 2-5, 2-6) alternate to realize a yarn with variable linear density wherein one component is continuous and two components are discontinuous, wherein t, T1, T2, T3 and T4 represent time.
The method according to claim 2, characterized in that: $\begin{array}{l} ρ' = ρ + Δρ= \frac{ρ}{V_{0}} * [(V_{01} + {ΔV}_{01}) + (V_{02} + {ΔV}_{02}) + (V_{03} + {ΔV}_{03})] \\ (0 \leq t \leq T_{1}) \end{array}$
$ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [(V_{01} + {ΔV}_{01}) + (V_{02} + {ΔV}_{02})] (T_{1} \leq t \leq T_{2})$
$\begin{array}{l} ρ' = ρ + Δρ= \frac{ρ}{V_{0}} * [(V_{01} + {ΔV}_{01}) + (V_{02} + {ΔV}_{02}) + (V_{03} + {ΔV}_{03})] \\ (T_{2} \leq t \leq T_{3}) \end{array}$
$\begin{matrix} ρ' = ρ + Δρ = \frac{ρ}{V_{0}} * [(V_{01} + {ΔV}_{01}) + (V_{01} + {ΔV}_{02})] & (T_{3} \leq t \leq T_{4}) \end{matrix}$
wherein speed change of the three feeding rollers (2-4, 2-5, 2-6) and speed change of two rollers of the three feeding rollers (2-4, 2-5, 2-6) alternate to realize a yarn with variable linear density wherein two components are continuous and one component is discontinuous, wherein t, T1, T2, T3 and T4 represent time.
The method according to claim 2, characterized in that: $ρ' = ρ + Δρ= \frac{ρ}{V_{0}} * [(V_{01} + {ΔV}_{01}) + (V_{02} + {ΔV}_{02}) + (V_{03} + {ΔV}_{03})]$
wherein speeds of the three feeding rollers (2-4, 2-5, 2-6) are changed to realize a yarn with variable linear density, wherein three components are continuous and the linear density is variable.
The method according to claim 2, characterized in that: in control method of dynamic feeding speed of the yarn, Δ_V0 = ΔV₀₁ + ΔV₀₂ + ΔV₀₃, change of the speed is derived from ΔV₀₁, ΔV₀₂, or ΔV₀₃ and determined by the blending ratio, and then ${ΔV}_{01} = K'_{1} (V_{0} + ΔV) - V_{01}, {ΔV}_{02} = K'_{2} (V_{0} + ΔV) - V_{02}, {ΔV}_{03} = K'_{3} (V_{0} + ΔV) - V_{03} .$
A device for realizing the method according to any one of the preceding claims, comprising a spinning system and a computer control system, wherein the spinning system comprises a feeding and carding mechanism, a collecting and twisting mechanism, and a winding and forming mechanism, wherein the feeding and carding mechanism comprises a combined feeding roller comprising three feeding rollers (2-4, 2-5, 2-6) having three rotation freedom degrees, a three-level carding roller comprising three carding rollers (2-8, 2-9, 2-10); wherein a speed ratio of the three feeding rollers (2-4, 2-5, 2-6) of the combined feeding roller with three rotation freedom degrees is adjusted, the collecting and twisting mechanism includes a fiber transport channel (1-10), a rotor (1-12), and a guide device; the winding mechanism includes a guide and winding mechanism; the computer control system includes a PLC programmable controller, a servo driver, a servo motor; wherein the combined feeding roller (2-4, 2-5, 2-6) with three rotation freedom degrees and the three-level carding roller (2-8, 2-9, 2-10) are driven by the servo motor.
The device according to claim 10, characterized in that, the combined feeding roller (2-4, 2-5, 2-6) with three rotation freedom degrees comprises a shaft (4-12), a bearing (4-1, 4-10), a hollow shaft (4-2), a first gear (4-3), a second gear (4-9), a third gear (4-11), a washer (4-4, 4-8), a first movable roller (4-5), a second movable roller (4-6), a third movable roller (4-7), wherein the first gear (4-3), the second gear (4-9), the third gears (4-11), the first movable roller (4-5), the second movable roller (4-6), and the third movable roller (4-7) rotate around the same axis, the first gear (4-3), the second gear (4-9), the third gear (4-11) drive the first movable roller (4-5), the second movable roller (4-6), and the third movable roller (4-7), respectively.