阅读说明：本技术 一种搓捻定型式调整纤维排列结构的加工方法及纱线 (Twisting shaping type fiber arrangement structure adjusting processing method and yarn ) 是由 徐卫林 刘可帅 许多 范航 杨旺旺 郭维琪 于 2020-12-30 设计创作，主要内容包括：本发明涉及一种搓捻定型式调整纤维排列结构的加工方法及纱线,本发明采用浸润给液方式使经过给液装置的长丝外层携带溶液,短纤须条经过牵伸机构牵伸后进入一级搓捻机构进行搓捻整理,携带溶液的长丝经一级搓捻机构与短纤须条结合,并进入二级搓捻机构进行搓捻整理；长丝在搓捻作用下被短纤须条所包覆,并在短纤须条扭转协同下呈螺旋状排列；搓捻整理后纱线经热处理装置固化定型长丝与短纤纱间的溶液,使得纤维的搓捻扭转捻合定型,同时抚顺纱线表层纤维,增强长丝与短纤纱间的应力结合,有效调控纱线内、外层结构,大幅增强纤维间结合作用、改善成纱结构和纱线强度。(The invention relates to a processing method and yarn for twisting and setting type adjustment of a fiber arrangement structure, wherein a solution is carried on the outer layer of a filament passing through a solution feeding device by adopting an infiltration solution feeding mode, a short fiber strip enters a first-stage twisting mechanism for twisting and finishing after being drafted by a drafting mechanism, the filament carrying the solution is combined with the short fiber strip by the first-stage twisting mechanism and enters a second-stage twisting mechanism for twisting and finishing; the filaments are coated by the short fiber strips under the twisting action and are spirally arranged under the twisting coordination of the short fiber strips; the solution between the filaments and the spun yarns is solidified and shaped by the heat treatment device after the yarns are twisted and finished, so that the twisting, twisting and shaping of fibers are realized, the fibers on the surface layer of the yarns are smoothed, the stress combination between the filaments and the spun yarns is enhanced, the inner layer structure and the outer layer structure of the yarns are effectively regulated and controlled, the combination effect between the fibers is greatly enhanced, and the yarn structure and the yarn strength are improved.)

1. A processing method for adjusting fiber arrangement structure in a twisting setting mode is characterized by comprising the following steps: respectively drafting the short fiber roving and the filaments carrying the solution on the surface layer by a drafting mechanism, then feeding the short fiber roving and the filaments into a first-stage twisting mechanism for first-stage twisting treatment, feeding the short fiber strands and the filaments subjected to the first-stage twisting treatment into a second twisting mechanism for second-stage twisting treatment, and buckling, twisting and embracing the fibers in the short fiber strands into twists in a torsional mode under the synergistic twisting action of the first-stage twisting mechanism and the second-stage twisting mechanism; the fiber arrangement and the yarn body twist distribution are dynamically adjusted under the reciprocating rotation action of the first-stage twisting mechanism and the second-stage twisting mechanism, the filament is coated by the short fiber strand under the twisting action and is spirally arranged under the twisting coordination of the short fiber strand, the solution carried by the surface of the filament is infiltrated into the short fiber from the surface of the filament under the twisting, twisting and cohesive force, and the fiber with the hook and the spiral conformation inside the short fiber strand infiltrated by the solution is strengthened in twisting and increased in orientation under the twisting action; and then, the yarns formed by the short fiber strands and the filaments after being processed by the second-stage twisting mechanism are subjected to curing and twist setting by a heat treatment device, fibers on the surface layers of the yarns are smoothed, and finally the heat-treated yarns are wound on a winding device.

2. The method of claim 1, wherein the solution is one of a polyvinyl alcohol solution with a concentration of 0.2% -2%, a polyacrylic acid solution with a concentration of 0.2% -2%, or a polyvinyl butyral solution with a concentration of 0.2% -3%.

3. The method as claimed in claim 1, wherein the chopped strands are one of cotton fibers and polyester fibers, and the filaments are chemical polyester filaments.

4. The method as claimed in claim 1, wherein the first and second twisting mechanisms have opposite traversing directions, the same rotating linear speed and the same traversing frequency.

5. The method as claimed in claim 1, wherein the heating temperature of the heat treatment device is 100-150 ℃.

6. A yarn processed according to the method for processing a twist setting type alignment structure of fibers of claim 1, wherein the yarn comprises a forward twist area, a reverse twist area and a filament spiral arrangement area, wherein the forward twist area and the reverse twist area form a continuous twist type twist cohesion structure, and the filament spiral arrangement area is formed by a filament wrapping area tightly wound on the surface of the forward twist area and the reverse twist area.

Technical Field

The invention relates to the technical field of yarn prevention, in particular to a twisting setting type fiber arrangement structure adjusting processing method and yarn.

Background

The filament/staple composite spinning technology can enable the yarn to simultaneously have the style, hand feeling and moisture absorption performance of natural staple and the stiffness and shape retention performance provided by the self-elongation of the filament, and the excellent yarn quality and the unique yarn structure enable the yarn to get more and more attention in recent years and rapidly develop into an important method for meeting the diversity of the textile performance. At present, the spinning methods for producing filament composite yarns are various, and ring spinning, rotor spinning, vortex spinning, self-twisting spinning and the like are mainly used.

The performance of the yarn depends on the structure of the yarn, and in the composite yarn, the arrangement distribution between the short fiber and the filament and the cooperative conformation between the short fiber and the filament play a decisive role in the yarn forming performance. The research is actively and meaningfully researched on the structure and the performance of the composite yarn from theory and reality, but is only limited to the research on the performance of the yarn spun by a single composite spinning mode, and the systematic research on the relationship between the structure and the performance of the composite yarn is insufficient.

The ring spinning belongs to holding end spinning, has excellent control force on fiber forming, and further improves the yarn quality through continuous research and improvement. Therefore, the ring spinning technology has the advantages of strong raw material adaptability, compact yarn forming structure and high yarn forming strength. Since the ring spinning twisting and winding are performed simultaneously, the spinning speed is limited by the spun yarn package; although technical researches such as long spinning and automatic doffing are continuously strengthened in the industry in recent years, the ring spinning speed and the twisting efficiency are not greatly improved, and the spinning spindle speed is always maintained within the range of 15000-20000 r/min.

The Gharahaghaji et al developed a novel filament bundle spinning (Cluster-Spun) by modifying the filament feeding device using a grooved splitting roller similar to the Soro spinning, using the principle of Solo Spun. The filaments pass through the splitting roller before being fed into the short fiber strands and are in a flat belt shape with a plurality of filaments arranged in parallel, so that the filaments and the short fibers are twisted and cohered in a spinning triangular space, the friction force among 2 components is enhanced, and finally the filament split-spinning yarn with a brand-new structure is obtained. Similarly, Naeem et al use a micro grooved roller to split the filaments to enhance the wrapping effect of the filaments on the central staple fiber sliver of the yarn, and finally achieve the purpose of enhancing the wear resistance of the yarn. All the composite spinning methods effectively increase the friction force among the filaments and the short fibers, and are more favorable for full compounding among 2 components. In addition, due to the spinning accompanying effect of the filaments, the head breaking rate in the spinning process is reduced, the wrapping effect of the filaments realizes the capture of short fibers outside the fiber strands, the utilization rate of the short fibers is improved, and the quality of finished yarns is finally improved.

Compared with ring spinning, the rotor spinning has the advantages that the rapid, short-flow and automatic spinning of fiber strips is realized. However, the rotor spinning technology is inferior to ring spinning in the development of high-quality and ultra-high count spinning, and the limitation of short fiber rotor spinning high-count and high-strength yarns is not broken through yet.

Vortex spinning also belongs to free-end spinning, when the content of fiber strands in the spinning process of high count yarns is less, insufficient twisting cohesion force is easy to occur, the yarn breakage rate is high, and even spinning cannot be performed. Therefore, the application range of the vortex spinning technology is limited by factors such as the type of fiber and the type of yarn.

Because the self-twisting yarn needs two strands of fiber to be interlocked by mutual self-twisting action to form yarn, the self-twisting yarn is a folded yarn, generally a medium-specific yarn, has the defect of weak section of a non-twisting area of the self-twisting yarn, and is only suitable for wool long fiber.

The invention relates to a twisted yarn processing method and a processing device thereof, Chinese patent No. CN103924350B, published by No. 2016.8.17, and discloses a twisted yarn processing method and a processing device thereof, wherein a complex mechanism of 'a first roller, a first twisting roller, a second roller and a second twisting roller' is utilized to output cotton fibers and polyester filaments from the first roller to the first twisting roller together for twisting to form in-phase polyester-cotton self-twisted yarns, and then the polyester-cotton self-twisted yarns and another polyester filament enter the second twisting roller together for twisting to form double-wound three-strand self-twisted polyester-cotton yarns of two polyester filaments. The cotton fiber and the polyester filament yarn are twisted twice on the self-twisting machine, so that the problem that the cotton short fiber self-twisting yarn is easy to loosen and break is solved, and the polyester-cotton composite yarn can be processed on the self-twisting machine. However, the process of introducing two filaments is complicated, and the introduction of the second filament increases the side path length, so that the transverse moving parameters of the second rubbing roller are inconsistent with the process design of the first rubbing roller, and the use difficulty is increased. The use of two groups of polyester filaments weakens the characteristics of the spun yarn, and the twisting area of the polyester-cotton self-twisting yarn needs to be staggered, so that the two polyester filaments are uniformly wound on the cotton fiber and are difficult to control in the actual production. The internal short fiber twist setting depends on blended low-melting-point chemical fibers, and is fused and bonded in a microwave heating mode, so that the difficulty of cotton blending in the front spinning process is increased, and the twist setting effect cannot be regulated in the spinning process.

Disclosure of Invention

In view of the above problems, the present invention aims to provide a processing method for twisting and setting type adjustment of fiber arrangement structure and yarn, which can effectively improve the quality of yarn, improve the yarn structure, improve the yarn strength, reduce the yarn hairiness, and inherit the advantages of filament-staple composite spinning.

In order to achieve the purpose, the technical solution of the invention is as follows:

a processing method for adjusting fiber arrangement structure in a twisting setting mode comprises the following steps: respectively drafting the short fiber roving and the filaments carrying the solution on the surface layer by a drafting mechanism, then feeding the short fiber roving and the filaments into a first-stage twisting mechanism for first-stage twisting treatment, feeding the short fiber strands and the filaments subjected to the first-stage twisting treatment into a second twisting mechanism for second-stage twisting treatment, and buckling, twisting and embracing the fibers in the short fiber strands into twists in a torsional mode under the synergistic twisting action of the first-stage twisting mechanism and the second-stage twisting mechanism; the fiber arrangement and the yarn body twist distribution are dynamically adjusted under the reciprocating rotation action of the first-stage twisting mechanism and the second-stage twisting mechanism, the filament is coated by the short fiber strand under the twisting action and is spirally arranged under the twisting coordination of the short fiber strand, the solution carried by the surface of the filament is infiltrated into the short fiber from the surface of the filament under the twisting, twisting and cohesive force, and the fiber with the hook and the spiral conformation inside the short fiber strand infiltrated by the solution is strengthened in twisting and increased in orientation under the twisting action; and then, the yarns formed by the short fiber strands and the filaments after being processed by the second-stage twisting mechanism are subjected to curing and twist setting by a heat treatment device, fibers on the surface layers of the yarns are smoothed, and finally the heat-treated yarns are wound on a winding device.

Further, the solution is one of polyvinyl alcohol solution with the concentration of 0.2% -2%, polyacrylic acid solution with the concentration of 0.2% -2% or polyvinyl butyral solution with the concentration of 0.2% -3%.

Further, the short fiber strands are one of cotton fibers or polyester fibers, and the filaments are polyester chemical fiber filaments.

Furthermore, the transverse moving directions of the first-stage twisting mechanism and the second-stage twisting mechanism are opposite, the rotating linear speeds are the same, and the transverse moving frequency is the same.

Further, the heating temperature of the heat treatment device is 100-150 ℃.

Meanwhile, the invention also provides a yarn processed by the processing method for twisting setting type fiber arrangement structure adjustment, the yarn comprises a forward twisting and twisting area, a reverse twisting and twisting area and a filament spiral arrangement area, wherein the forward twisting and twisting area and the reverse twisting and twisting area form a continuous twisting and twisting type twisting and holding structure, and the filament spiral arrangement area is formed by filament wrapping and winding areas which are tightly wound on the surfaces of the forward twisting and twisting area and the reverse twisting and twisting area.

Due to the adoption of the technical scheme, compared with the prior art, the processing method for adjusting the fiber arrangement structure in the twisting setting mode has the advantages that: according to the invention, a single liquid-carrying filament is wrapped by the spun staple fiber strips twisted by the twisting mechanism to generate twisting, and the spun staple fiber strips are spirally arranged under the driving of twisting and twisting, so that the surface layer structure of the spun staple fiber yarns is reinforced, the continuous stability of the spun staple fiber strips is ensured, untwisted weak rings existing in twisting and twisting are eliminated, the problem that the spun staple fibers are difficult to continuously form yarns by twisting is solved, and the traditional style and hand feeling of the spun staple yarns are maintained; the reciprocating steering of the first-stage twisting mechanism and the second-stage twisting mechanism dynamically adjusts the fiber arrangement and the twist distribution of the yarn body, so that the torque of the internal short fibers is balanced, and untwisted weak rings are eliminated; meanwhile, when carrying liquid filament yarn to wrap, the solution soaks the short fiber strand, changes the fiber molecular structure, increases the fiber orientation, strengthens the twisting, twisting and cohesion of the fiber, and heat-treats the curing solution to strengthen the fiber binding force, so that the twisting, twisting and shaping of the fiber between the first-stage twisting mechanism and the second-stage twisting mechanism are realized, the surface fiber is smoothed, the yarn structure is improved, the yarn strength is improved, and the yarn hairiness is reduced. The spun yarn is directly wound, so that the production efficiency is greatly improved, the invention inherits the advantages of filament-short fiber composite spinning, ensures the raw material universality and variety adaptability, and breaks through the count limit of the spun yarn. The invention has the advantages of convenient operation, no additional energy consumption, simple and clear mechanism and easy popularization and use.

Drawings

FIG. 1 is a schematic view of a twisting and setting type fiber arrangement structure adjusting process.

FIG. 2 is a schematic view of a yarn structure spun by a twisting and setting type fiber arrangement structure adjusting processing method. In the figure: 1-filament cylinder, 2-filament, 3-roving cylinder, 4-short fiber roving, 5-drafting mechanism (52-front roller, 51-front rubber roller, 54-middle roller, 53-upper sheath, 56-rear roller and 55-rear rubber roller), 6-liquid feeding device, 7-short fiber strand, 8-first-stage twisting mechanism, 9-second-stage twisting mechanism yarn, 10-heat treatment device, 11-yarn, 12-winding device, 13-forward twisting zone, 14-reverse twisting zone and 15-filament spiral arrangement zone.

Detailed Description

The present invention is described in further detail below with reference to the attached drawing figures.

Referring to the attached figure 1, a method for processing a twisting setting type adjusting fiber arrangement structure comprises the following steps:

s1, after unwinding short fiber roving 4 from the roving bobbin 3, the short fiber roving is drafted by a three-roller drafting mechanism 5 and then enters a first-stage twisting mechanism 8 arranged at the front ends of a front roller 52 and a front rubber roller 51, and meanwhile, the filament 2 unwound from a filament tube 1 carries solution on the filament surface layer after passing through a liquid feeding device 6 and is fed into the first-stage twisting mechanism 8 after passing through the front roller 52 and the front rubber roller 51.

S2/the drafted staple fiber strand 7 and the filament 2 pass through the primary twisting mechanism 8 and then enter the secondary twisting mechanism 9 again, the fibers inside the staple fiber strand 7 are bent, twisted and embraced into a twist under the two synergistic twisting actions of the primary twisting mechanism 8 and the secondary twisting mechanism 9, when the primary twisting mechanism 8 and the secondary twisting mechanism 9 are turned back and forth, the fiber arrangement and the yarn body twist distribution are dynamically adjusted, the fed liquid-carrying filament 2 is coated by the staple fiber strand 7 under the twisting action and is spirally arranged under the synergistic action of the twist of the staple fiber strand, the filament 3 is coated in the staple fiber, the yarn cohesion is enhanced, the staple fiber strand 7 is continuously twisted and cannot be scattered, the twist winding is stabilized, the yarn structure is stabilized, and the weak ring is eliminated.

The solution carried by the surface of the filament 2 permeates from the surface of the filament 3 into the short fiber under the twisting and twisting cohesive force, and the fiber with the hook and the spiral conformation in the short fiber strand 7 soaked by the solution is subjected to the twisting force to strengthen the twisting and increase the orientation. Meanwhile, yarns output by the first-stage twisting mechanism 8 and the second-stage twisting mechanism 9 are solidified and twisted through the heat treatment device 10, fibers on the surface layer of the yarns 11 are smoothed, the solidified solution enables twisting and twisting of the fibers between the first-stage twisting mechanism 8 and the second-stage twisting mechanism 9 to be shaped in a twisting mode, meanwhile, the bonding force between the filaments and the staple fibers and between the fibers inside the staple fibers is enhanced, and finally the yarns 11 subjected to heat treatment are wound on the winding device 12.

The short fiber strands 7 can be cellulose fiber strands such as cotton fibers or fiber strands such as terylene, and the filaments 2 can be fiber filaments such as terylene.

The solution in the liquid feeding device 6 can be polyvinyl alcohol solution with the concentration of 0.2% -2%; can be polyacrylic acid solution with the concentration of 0.2-2 percent; can be polyvinyl butyral ester solution with the concentration of 0.2-3%.

The three-roller drafting mechanism comprises a front roller 52, a front rubber roller 51, a middle roller 54, an upper sheath 53, a rear roller 56 and a rear rubber roller 55, the jaw line distance of the first-stage twisting mechanism 9 from the front roller 52 to the front rubber roller 51 is 50-200 mm, the jaw line distance of the second-stage twisting mechanism 9 from the jaw line distance of the first-stage twisting mechanism 8 is 80-250mm, and the first-stage twisting mechanism 8, the second-stage twisting mechanism 9 and the three-roller drafting mechanism 5 keep the same horizontal line.

The first-stage twisting mechanism 8 and the second-stage twisting mechanism 9 can perform rotary motion and reciprocating transverse motion, the transverse moving directions of the first-stage twisting mechanism 8 and the second-stage twisting mechanism 9 are opposite, the rotary linear speeds are the same, the transverse moving speeds are the same, the rotary linear speeds of the first-stage twisting mechanism 8 and the second-stage twisting mechanism 9 are 10m/min-100m/min, the transverse moving speeds are 1m/min-10m/min, and the transverse moving distance is 5cm m-25 cm.

The primary twisting mechanism 8 and the secondary twisting mechanism 9 are respectively composed of two pairs of twisting rubber rollers, wherein the surfaces of the twisting rubber rollers are subjected to super-hydrophobic treatment, and the solution carried on the surfaces of the filaments cannot be attached to the rubber rollers when contacting the twisting rubber rollers.

The linear distance between the heat treatment device 10 and the secondary twisting rubber roller 9 is 3-15mm, and the heat treatment temperature is 100-150 ℃.

Referring to fig. 2, a single-strand yarn is composed of a forward twist area 11, a reverse twist area 12, and a filament wrapping area 13; the short fiber strands form twisting type twisting cohesion under the reciprocating twisting of the two twisting mechanisms, when the first-stage twisting mechanism and the second-stage twisting mechanism form Z-direction twisting turns on the middle short fiber strands, the short fiber strands form a forward twisting and twisting area 11, when the first-stage twisting mechanism and the second-stage twisting mechanism form S-direction twisting and twisting turns on the middle short fiber strands, the short fiber strands form a reverse twisting and twisting area 11, filaments are tightly wound along the surfaces of the twisted short fiber strands under the driving of twisting acting force to form a filament wrapping and twisting area 13, and when the first-stage twisting mechanism and the second-stage twisting mechanism turn, a non-twisting area generated by fiber twisting balance is eliminated under the synergistic action of filament wrapping and twisting, so that the forward twisting and twisting area 11 and the reverse twisting and twisting area 12 are tightly connected. The comprehensive fiber strands are transversely rubbed by a first-stage twisting mechanism 6 and a second-stage twisting mechanism 7 to generate a twisting regulation multi-stage fiber arrangement structure, and a single yarn structure with spirally wound surface filaments and forward and reverse twisting and embracing type internal fibers is formed.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

Example 1

The staple fiber strands are 450tex pure cotton roving strands, the filaments are 25D polyester filaments, a polyvinyl alcohol solution with the concentration of 0.2% is arranged in a liquid feeding device, the liquid feeding speed is 10ml/min, the existing heat treatment device is used, the heat treatment temperature is set to be 120 ℃, and the process flow is as follows:

the pure cotton roving strands enter a three-roller drafting mechanism after being unwound from a roving bobbin and are output by a front jaw, meanwhile, polyester filaments are unwound from a filament tube and then fed by a liquid feeding device filled with polyvinyl alcohol solution through a front roller and are placed in the center of the drafted short fiber strands, the short fiber strands and the filaments output by the front jaw at 45m/min sequentially enter a primary twisting mechanism and a secondary twisting mechanism, the transverse moving directions of the primary twisting mechanism and the secondary twisting mechanism are opposite, the transverse moving frequency is the same, the linear speed is 45m/min, the maximum transverse moving distance is 25cm, and the transverse moving speed is 3 m/min. The yarn enters a micro-processing device 'CN 105401270B a restricted type smooth and clean spinning device' of a heat treatment device after being twisted and cohered by a twisting mechanism, wherein the heat treatment module is about 20mm, and the temperature is 120 ℃. The hairiness on the surface of the yarn is smoothed by the heat treatment device, is dressed on the surface of the yarn, and is solidified and twisted by the solution in the polyester filament and the pure cotton short fiber to form the soft yarn without torque and with tightly bonded fiber torsion.

Example 2

The short fiber strand is 800tex viscose roving strand, the filament is 25D polyester filament, the liquid feeding device is filled with polyacrylic acid solution with the concentration of 1%, the liquid feeding speed is 6ml/min, the existing heat treatment device is used, the heat treatment temperature is set to be 150 ℃, and the process flow is as follows:

the viscose roving strand enters a three-roller drafting mechanism after being unwound from a roving bobbin, is output by a front jaw, meanwhile, polyester filament yarns are fed by a liquid feeding device filled with polyacrylic acid solution after being unwound from a filament tube and then by a front roller, and are placed in the center of a drafted short fiber strand, the short fiber strand and the filament yarns output by the front jaw at 40m/min sequentially enter a first-stage twisting mechanism and a second-stage twisting mechanism, the transverse moving directions of the first-stage twisting mechanism and the second-stage twisting mechanism are opposite, the transverse moving frequency is the same, the linear speed is 40m/min, the maximum transverse moving distance is 20cm, and the transverse moving speed is 5 m/min. The yarns enter a micro-processing device of a heat treatment device after being twisted and cohered by a twisting mechanism, wherein the heat treatment module is about 25mm, and the temperature is 150 ℃. The hairiness on the surface of the yarn is smoothed by the heat treatment device, is taken on the surface of the yarn, and is solidified, twisted and formed by the solution in the polyester filament and the viscose staple fiber to form the soft yarn without torque and with tightly bonded fiber by twisting.

Example 3

The chopped fiber strands are 280tex lyocell roving strands, the filaments are 20D polypropylene filaments, the liquid feeding device is filled with polyvinyl butyral solution with the concentration of 0.4%, the liquid feeding speed is 10ml/min, a heat treatment device is used, the heat treatment temperature is set to be 150 ℃, and the process flow is as follows:

the Lyocell roving strands enter a three-roller drafting mechanism after being unwound from a roving bobbin and are output by a front jaw, meanwhile, polypropylene filaments are unwound from a filament cylinder and then fed by a liquid feeding device filled with polyvinyl alcohol solution through a front roller and are placed at the position of 2/3 of the whole drafted short fiber strands, the short fiber strands and the filaments output by the front jaw at 30m/min sequentially enter a primary twisting mechanism and a secondary twisting mechanism, the transverse moving directions of the primary twisting mechanism and the secondary twisting mechanism are opposite, the transverse moving frequency is the same, the linear speed is 30m/min, the maximum transverse moving distance is 10cm, and the transverse moving speed is 2.5 m/min. The yarns enter a micro-processing device of a heat treatment device after being twisted and cohered by a twisting mechanism, wherein the heat treatment module is about 20mm, and the temperature is 150 ℃. The hairiness on the surface of the yarn is smoothed by the heat treatment device, is dressed on the surface of the yarn, is solidified and twisted by the solution in the polypropylene filament and the Lyocell short fiber to form the soft yarn without torque and with tightly bonded twisted fibers

In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.

The features of the embodiments and embodiments described herein above may be combined with each other without conflict.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.