CN1587464A - Fiber strand pre-twisting aggregation method and device - Google Patents

Abstract

The present invention relates to a method and device for pre-twisting and accumulating fiber strands. In the method, after the fiber strands enter the spinning drafting area, they are not directly output from the nip of the front rollers before spinning and twisted into yarns. A false twister is added between the apron nip and the front roller nip in the drafting area to gather and pre-twist the drafted fiber strands, forming false twist and convergence in this area, and the twist is not transmitted To the nip of the drafting roller to ensure the effective drafting of the strands in the drafting zone. The pre-twisting device for realizing the method is composed of a false twister and a driving mechanism driven by the front roller top roller and installed on the drafting cradle. It is characterized by simple mechanism, easy installation, and obvious effect. It can turn the original untwisted flat sliver into a twisted and tight sliver, which can reduce the hairiness of the sliver and increase the continuity and strength of the sliver.

Description

A method and device for pre-twisting and gathering fiber strands

Technical field:

The invention relates to fiber accumulation and sliver reinforcement technology in the field of novel ring spinning. Furthermore, it relates to a method and device for pre-twisting and accumulating fiber strands. The method is that after the fiber strands enter the spinning drafting area and are drafted, they are drawn between the apron nip and the front roller nip in the drafting area. A false twister is added to gather and pre-twist the drafted fiber strands. The pre-twisting device to realize this method is driven by a false twister and the front roller and installed on the drafting cradle of the drive mechanism.

Background technique:

The basis of high-grade lightweight fabrics is high-count yarns. The processing of smooth and smooth fabrics all depends on the smoothness and hairiness of the yarn. The softness of the fabric is not only the structure of the fabric itself, but also the softness of the yarn. Therefore, the properties of the yarn are the basis for the excellent performance of the fabric. At present, there are many contradictions and difficulties in processing high-count, smooth and soft yarns in theory. If the yarn is to be soft, the twist should be small and the structure should be loose, which brings great difficulties to the processing of high-count yarns. , that is, spinning is easy to break, and the appearance of the yarn is poor; if the yarn is smooth and high-count, it requires high twist and tight structure. Obviously, this is a contradiction. In order to solve this contradiction, the usual way is to choose finer fibers. This method is relatively easy for chemical fibers, but difficult for naturally grown cotton, wool, and hemp fibers. At the same time, the thinning of fibers will bring greater difficulties to the previous process of spinning, such as carding, opening, straightening and parallel arrangement. Therefore, the method (Malina L, Studer A. Precisely located suction assembly in compact spinning drafting frame. DE 19625526, Rieter AG Maschf, 1998; Norbert B. Compression device for drawn slivers, DE19846268, Schurr, Stahlecker & Grill, 1999; Angelo L, Herbert S.Ring spinning method and a yarn made thereby, US5651244, Rieter Machine Works, Ltd., 1997; Norbert B, Device forcondensing a drafted Sude fiber strand, US6073314, Spindesfa B. Arrangement for condensing a drafted fiber strand and method forming yam therefrom, US6108873, Spindelfabrik Suessen, 2000; Schwab T, Malina L. Draw frame for compact spinning preventing inter-cord fiber bridges, DE 19726694, Rieter, DE 19726694, Rieter 9) Other methods of enhancing spinning, such as sirofil (Meyer UD, Varesio M, Frigerio D. Ring spinner assembly for spun cladded or core yarn. DE19804341, 1999; CSIRO, Yarn Spinning, WO9514800, 1995; James L, Gull JNA, Roger HOL. Improvements to the Manufacture of Yarn Spunon Closed-End, High Draft Spinning Systems, WO9401604, 1994; Sun Liming, Zhu Ruibing, Sirofill spinning machine, Shandong Jining Ruyi Wool Textile Co., Ltd., announcement number: 2377258, authorized announcement date: 2000 May 10;) and solospun (Prins M, Lamb P, Finn N, Solospun, The Long Staple Weavable Singles Yarn "An Odyssey in Fibers and Space" Textile Institute 81st World Conference, Melbourne, Australia, April 2001; Cheng Longdi et al., Fiber strand splitting device for cable strand spinning, applicant: Donghua University, application number: 00265488.1, publication date: 2001.10.24) spinning method. Among them, gathering spinning is divided into dust cage gathering method (Norbert B. Arrangement and method for condensing a drafted fiber strand and method for making yarn therefrom, US6263656, Spindelfabrik Suessen, 2001; Malina L, Studer A. Precisely located suction assembly spinning in compact drafting frame, DE 19625526, Rieter AG Maschf, 1998) and groove-type aggregation method (Cheng Longdi, Yu Xiuye, Yu Weidong, etc. Ring spinning fiber strand splitting device, invention patent, application number: 00135183.4, application date: December 26, 2000). For concentrated spinning, the fiber strands are gathered and arranged in parallel to increase the spinnable count of the fibers and reduce the hairiness by means of the airflow or shape accumulation of the fiber strands when they exit the front roller mouth, but the mechanism is complicated and the cost is high . Sirofil enhances and reduces hairiness by combining filaments and wrapping. Most of the wrapping methods occur at the exit roller mouth, and there are also patent reports that occur in the drafting area (Yamagata S, Susami K. Helically wrapped yarn, USP3978648,1976), but the effect of hairiness reduction is not obvious. Solospun spinning is to reduce hairiness and improve spinnability by splitting and re-twisting fiber bundles, but the splitting part in spinning is easy to lose or unevenly split, which will eventually affect the uniformity of yarn sliver and reduce hairiness. Not obvious.

The present invention solves the difficult-to-control converging problem of the flat strands through the mechanical pre-twisting effect on the fiber strands. At the same time, through the pre-twisting action, the strands already have a certain degree of convergence, hugging and twist when they exit the nip of the front roller. , so as to reduce spinning breakage and hairiness, thereby improving the appearance quality and internal quality of the yarn, and increasing the spinnability of the fiber.

Invention content:

The object of the present invention is to provide a method and device that can be used for pre-twisting and gathering of fiber strands in ring spinning, so as to improve the effective gathering of fiber strands before twisting into yarn, reduce yarn hairiness and reduce spinning. Yarn breakage, so that the spinnable yarn count is higher, and the yarn is softer and smoother.

The principle of the present invention is to add a false twister between the apron nip of the drafting roller and the front roller nip, and the false twisting and convergence of the false twister will gather the fiber strands and increase the cohesion between the fibers Therefore, when the fiber strands come out of the nip of the front roller, the residual twist makes them have better continuity and certain strength. Structured yarn.

Technical solution of the present invention is as follows:

A false twister is set between the nip of the draft roller apron and the nip of the front roller, and the rotation is transmitted to the false twister through the rotating top roller and the reversing bevel gear in contact with the front roller top roller. The bell mouth, curved channel and rotation of the device make the fiber strands of the draft roller apron nip converge, and reach the front roller nip through the curved channel of the false twister. Due to the rotation of the false twister and the friction of the curved channel, the fiber strands are twisted in this interval, forming pre-twisting and gathering. Because the twist directions at both ends of the false twister are different, it is called false twist, but this twist can be partially reserved to the nip of the front roller. Therefore, this mechanism makes the fiber strands have more pre-twisting and gathering effects than the original spinning strands, and it is easier to form yarns under the original twisting and superposition effect.

The key component to realize the method is a fiber strand pre-twisting and gathering device of the present invention, which is characterized in that it is a false twister 1 placed between the nip of the front roller and the nip of the draft roller apron. The driving mechanism 2 driven by the top roller of the front roller, which can be stable and rotates the false twister, and a fixed bracket 3 with a false twister 1 and the driving mechanism 2, which can be installed on the drafting cradle . The false twister consists of bell mouth 11, curved channel 12, hollow shaft 13 and outer gear 14. The direction of rotation can be changed (clockwise or counterclockwise) by the meshing of the left and right reversing bevel gears 23; The size of transmission gear 25, bridge gear (26 and 27) and outer cover gear is adjusted. Drive mechanism is made up of contact top roller 21, transmission top roller slide bar 22, left and right reversing bevel gear 23, driven bevel gear 24, transmission gear 25, bridge gear 26 and 27, swing plate 28, and with false twister 1 and The fixed brackets 3 are connected. The fixed support consists of a support 31 and a saddle 32, which can be directly installed on the drafting cradle of the ring spinning machine. As shown in Figure 1. This false twister and each transmission gear should be contained in the balance weight 29 phase balance of swing plate 28 other ends, promptly can form with meeting steady state.

The bell mouth 11 of the false twister is consistent with the centerline of the fiber strands, and can be automatically aligned with the movement of the fiber strands; the curved channel 12 of the false twister can change its bending degree and length according to the efficiency of false twisting, so as to Ensure the effect of pre-twisting.

The spinning process of the whole fiber strand of the present invention is: fiber strand (roving)—→yarn guide hook—→back roller—→draft roller—→apron jaw—→false twister—→front roller—→ twisted into yarn. Wherein difference is exactly to increase the false twister of the present invention.

The present invention is characterized in that the pre-twisting and gathering method is practical and effective, and the principle is clear; the structure of the pre-twisting and gathering device is simple, but it can effectively gather and pre-twist. The mechanism of the device is reasonable, and twisting can be reversed to meet the processing of yarns with different twisting directions; the speed and pre-twisting effect can be changed to improve the structure and spinnability of the yarn; it can move laterally to adapt to the alignment when the moving rod moves the yarn. Neutralizes tension-free.

Description of drawings:

Fig. 1 schematic diagram of pre-twisting and accumulating device structure,

Figure 2 Schematic diagram of the process position of the pre-twisting and agglomerating device

Figure 3 Schematic diagram of the structure of the false twister

Figure 4 Schematic diagram of saddle seat structure

Among them, Figure 1-1 is a side view of the pre-twisting and accumulating device and a partial sectional view of the false twister; Figure 1-2 is a front view of the pre-twisting and accumulating device; Figure 3-1 is a structural sectional view of the false twister; Figure 3-2 It is the left view of the false twister; Figure 4-1 is the front view of the saddle; Figure 4-2 is the left view of the saddle.

In the picture:

1-false twister 2-driving mechanism 3-fixed bracket 11-horn mouth 12-curved channel 13-hollow shaft 14-outer gear 15-fastening screw 21-contact roller 22-transmission roller slider 23-left , Right reversing bevel gear 24-passive bevel gear 25-transmission gear 26, 27-bridge gear 28-swing plate 29-balance weight 31-bracket 32-saddle seat

Detailed ways:

The following examples help to understand the present invention, but do not limit the content of the present invention.

Example 1

Adopt the pretwisting gathering device of the present invention, as shown in accompanying drawing 1. Install it on the drafting cradle of the ring spinning machine, as shown in Figure 2. Adjust the position of the false twister so that the center of the false twister’s bell mouth is aligned with the line connecting the draft roller apron jaws and the front roller jaws or the center line of the fiber strands, and tighten the connection between the saddle and the bracket to form a fixed Support, feed the fiber strands from the nip of the rear roller, pass through the drafting roller and the apron, and the fiber strands after leaving the apron pass into the false twister and reach the nip of the front roller. The fiber used is high-quality long-staple cotton, pure cotton spinning, and the spinning count is 100, 120, and 150. Adopt the breakage rate (number/thousand spindles·hour) and the yarn strength (cN/tex) of former ring spinning compared with the spinning that adopts the device of the present invention, the results are shown in the following table.

Table 1 Comparison of end-break rate and yarn strength in high-count cotton yarn processing Yarn count (public branch) Compact spinning without pre-twisting With pre-twisted compact spinning Difference rate strength Broken head rate strength Broken head rate strength Broken head rate 100 22.5 68 23.1 twenty three 2.67 -66.18 120 23.8 89 24.3 28 2.10 -68.54 150 21.3 145 24.2 34 13.62 -76.55

Example 2

Adopt exactly the same pre-twisting and accumulating device as in embodiment 1, and the installation method and location are the same, except that it is installed on the wool spinning ring spinning frame. The fiber used is pure wool fiber 80s, and the spinning process used is exactly the same, just adding the pre-twisting and gathering device of the present invention and not adding the device to spin 80 public counts and 100 public counts wool yarns, and the characteristics of their respective yarns are compared See the table below. Wherein, when processing 100 metric wool yarn with the same roving of 80s fiber, it is almost impossible to process it into yarn, but with this device, almost smooth spinning is possible, but the strength is slightly lower than the 80 metric count of the same method.

Table 2 Comparison of end-break rate and yarn-forming index in high-count wool yarn processing Yarn count (public branch) Compact spinning without pre-twisting With pre-twisted compact spinning Difference rate strength Broken head rate hairiness strength Broken head rate hairiness strength Broken head rate hairiness 80 15.8 82 4.5 16.5 33 1.4 4.43 -59.76 -68.89 100 13.2 198 6.2 15.9 40 1.5 20.45 -79.80 -75.81

Claims (8)

1. A method for pre-twisting and agglomerating fiber strands, characterized in that when the fiber strands enter the spinning drafting zone, they are not directly output and twisted into yarn by the nip of the roller before spinning, but in the drafting zone A false twister is added between the nip of the apron and the nip of the front roller to bundle and pre-twist the drafted fibers, so that the fiber strands form false twists and converge in this range, and the added twist is not transmitted to the drafting machine. Roller jaws to ensure effective drafting of fiber strands in the drafting zone; The draft zone refers to the nip of the front roller to the nip of the draft roller; the false twist is formed by friction and eccentric rotation; The twisting in the mouth and the curved channel is completed; the pre-twisting refers to the twist that the front roller has, and the twist is not transmitted to the nip of the drafting roller because of the holding effect of the apron in the original drafting mechanism accomplish. 2. The device for pre-twisting and bundling of fiber strands according to claim 1, characterized in that it is driven by a false twister with a converging mouth and driven by the front roller top roller, installed on the drafting cradle constitute; The false twister is composed of a hollow shaft with a curved channel and a trumpet-shaped converging port and a gear fixed to the hollow shaft, and is connected with the swing plate and the outer gear in the driving mechanism; the driving mechanism is composed of The contact top roller, the fixed bracket, the transmission top roller slide bar mounted on the fixed support, a pair of reversing bevel gears and swing plates fixed on the transmission top roller slide bar, and the passive bevel gear and transmission gear that are sequentially driven by each other , bridge gear and outer gear. 3. The device for pre-twisting and bunching fiber strands according to claim 2, characterized in that a pair of reversing bevel gears are symmetrically mounted on the transmission roller slide bar, and the transmission leather roller slide bar loops through the fixed In the round hole of the bracket, pushing the transmission top roller slide bar can make the reversing bevel gear mesh with the passive bevel gear respectively. 4. according to the device of claim 2 said fiber strand pre-twisting and converging, it is characterized in that the twister driven by the rotation of the front roller top roller is to drive the bevel gear, the transmission gear and the bridge gear by the friction top roller , and finally transmitted to the false twister; the speed of the false twister is adjusted by the size of the friction top roller and the bridge gear. 5. The device for pre-twisting and bundling fiber strands according to claim 2, characterized in that the swing center of the swing plate is consistent with the coaxial axis of the driven bevel gear and the main gear, and the swing plate is mounted on the The swing assembly formed by the bridge gear on the swing frame and the false twister has its center of mass also on the center line of the swing shaft. 6. The device for pre-twisting and bunching fiber strands according to claim 2, characterized in that one end of the swing plate is connected with a counterweight. 7. The device for pre-twisting and bundling of fiber strands according to claim 2, characterized in that said fixed support is fixed on the saddle, and is installed on the roller on the ring spinning machine through the saddle on the cradle. 8. The application of the device for pre-twisting and bundling fiber strands according to claim 1, which is characterized in that it is used for ring spinning of various fibers.

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