Nested two-for-one twisting spindle

Abstract

The utility model discloses a nested two-for-one twisting spindle which comprises an outer-layer two-for-one twisting spindle and at least one inner-layer two-for-one twisting spindle arranged on the outer side of the outer-layer two-for-one twisting spindle. The inner-layer two-for-one twisting spindle is used for being sleeved with cone yarn, the inner-layer two-for-one twisting spindle is correspondingly provided with an inner-layer yarn guide hook, and the inner-layer two-for-one twisting spindle and the inner-layer yarn guide hook are configured to be capable of performing two-for-one twisting on the cone yarn so as to form two-for-one twisted yarn; the outer-layer two-for-one twisting spindle is correspondingly provided with an outer-layer yarn guide hook, and the outer-layer two-for-one twisting spindle and the outer-layer yarn guide hook are configured to perform secondary two-for-one twisting on the two-for-one twisting yarn. Through the nested structure of the inner-layer two-for-one twisting spindle and the outer-layer two-for-one twisting spindle, integration of multiple functions of two-for-one twisting, doubling and secondary two-for-one twisting can be achieved, tasks executed by a two-for-one twisting machine, a doubling winder and a two-for-one twisting machine in the traditional spinning process are completed at a time, and therefore the spinning technological process is effectively shortened, labor is reduced, energy is saved, and the spinning efficiency is improved. And efficient and short-process production is realized.

Description

Technical Field

[0001] The utility model relates to a doubling spindle, in particular to a nested doubling spindle. Background Art

[0002] Doubling is a twisting method in which each revolution of the twisting spindle can give two twists to the silk thread. The silk thread to be twisted is led out from the supply bobbin, passes through the hollow spindle from the top of the spindle, and as the spindle rotates, one twist is obtained by the silk thread in the hollow section of the spindle. Then the silk thread passes through the transverse holes of the yarn storage disc at the lower end of the hollow spindle and is led to the upper guide hook. The yarn storage disc rotates with the spindle, and the silk thread rotates relative to the fixed point of the guide hook along with the transverse holes, and another twist is obtained by the silk thread between the transverse holes and the guide hook, thus realizing doubling. However, the structure and function of traditional doubling spindles are single, the twisting efficiency is difficult to be further improved, and the spinning requirements of different types of yarns cannot be met.

[0003] In recent years, the research on multi-doubling technology has gradually started at home and abroad, and some companies have also launched forming equipment. Among them, "New Technology of the Twisting System of Saurer Company" (Foreign Textile Technology, No. 10, 1997, 6-7) introduced a three-twist spindle, and the three-twisting machine adopted the doubling technology. The core component of the machine, the spindle, consists of two components, which rotate at the same speed but in opposite directions, so as to realize three twists. This technology has the problems of large load of the bobbin rotation, increased power consumption, very high dynamic balance requirements for the rotating bobbin, serious wear of relevant bearings in actual operation, and high failure rate.

[0004] "A Multifunctional Four-fold Twisting Synchronous Two-fold Twisting Machine" (Application No. 202311531965.9) introduced a four-fold twisting technology and provided a multifunctional four-fold twisting synchronous two-fold twisting machine, including a thread twisting unit and a bobbin unit. The two units are separately arranged, and the structure is scattered. Among them, the thread twisting unit realizes the first doubling, and the bobbin unit completes the second doubling. In this utility model, the structure of the bobbin unit is complex, and a yarn winding mechanism is arranged inside the unit, which will lead to large load and mechanical wear of the bobbin unit and low speed.

[0005] Although the above references introduced technologies such as three-fold twisting and four-fold twisting, these technologies have complex structures, large mechanical wear and many faults in actual operation, and are difficult to be popularized and applied in practice. Content of the Utility Model

[0006] Purpose of the Utility Model: The purpose of the utility model is to provide an efficient nested doubling spindle, which can realize multi-functional integrated production.

[0007] Technical solution: The nested doubling spindle of the present utility model includes an outer doubling spindle and at least one inner doubling spindle arranged outside the outer doubling spindle; the inner doubling spindle is used to sleeved with a cheese, and an inner yarn guide hook is correspondingly arranged on the inner doubling spindle. The inner doubling spindle and the inner yarn guide hook are configured to be able to double-twist the cheese to form a double-twisted yarn; an outer yarn guide hook is correspondingly arranged on the outer doubling spindle. The outer doubling spindle and the outer yarn guide hook are configured to be able to perform secondary doubling on the double-twisted yarn.

[0008] Through the nested structure of the inner doubling spindle and the outer doubling spindle, the integration of multiple functions such as doubling, merging, and secondary doubling can be realized, and the tasks performed by three devices, namely a doubling frame, a yarn merging machine, and a doubling frame, in the traditional spinning process can be completed at one time, thereby effectively shortening the spinning process, reducing labor, saving energy, and realizing high-efficiency short-process production; by adjusting the number of inner doubling spindles, the rotation speeds of the outer doubling spindle and the inner doubling spindle, or the path of the cheese, different yarns can be manufactured to meet different production requirements and improve the adaptability of production.

[0009] The inner doubling spindle includes an inner spindle main shaft, an inner spindle bobbin, and an inner spindle tube arranged coaxially in sequence. The inner spindle tube is used to sleeved with the cheese, and the cavity of the inner spindle tube communicates with the radial hole of the inner spindle bobbin to form a first yarn guiding channel; the outer doubling spindle includes an outer spindle main shaft, an outer spindle bobbin, and an outer spindle tube arranged coaxially in sequence. The cavity of the outer spindle tube communicates with the radial hole of the outer spindle bobbin to form a second yarn guiding channel. The first yarn guiding channel and the second yarn guiding channel are used to guide the cheese. The cheese passes through the first yarn guiding channel, the inner yarn guide hook, the second yarn guiding channel, and the outer yarn guide hook in sequence to achieve double doubling. Specifically, the inner doubling spindle rotates, and the cavity of the inner spindle tube applies a twist to the cheese, and a twist is applied to the cheese again between the center of the inner spindle bobbin and the inner yarn guide hook, thereby realizing the first doubling. Subsequently, the outer doubling spindle rotates, and the cavity of the outer spindle tube applies a twist to the cheese, and a twist is applied to the cheese again between the center of the outer spindle bobbin and the outer yarn guide hook, thereby realizing the second doubling.

[0010] The nested doubling spindle includes an outer tray, an intermediate tray, and an inner tray. The outer tray, the intermediate tray, and the outer doubling spindle are coaxially arranged, and the inner tray and the inner doubling spindle are coaxially arranged; the outer tray is fixed to the frame and is rotationally connected to the outer spindle main shaft; the intermediate tray is rotationally connected to the outer spindle tube and the inner spindle main shaft; the inner tray is rotationally connected to the inner spindle tube.

[0011] An outer layer tray, an intermediate layer tray, and an inner layer tray are respectively fixed with an outer layer yarn bobbin, an intermediate layer yarn bobbin, and an inner layer yarn bobbin; magnetic attraction devices corresponding in position are installed on the outer layer yarn bobbin, the intermediate layer yarn bobbin, and the inner layer yarn bobbin. Optionally, an inner layer yarn guide hook is fixedly installed on the intermediate layer yarn bobbin. The above structure ensures the relative positions between the inner layer doubling spindles and the outer layer doubling spindles, and the magnetic attraction devices can fix the relative positions of the outer layer yarn bobbin, the intermediate layer yarn bobbin, and the inner layer yarn bobbin.

[0012] A thrust roller bearing is installed between the intermediate layer tray and the outer spindle disk of the outer layer doubling spindle. The above thrust roller bearing is used to bear the axial force. The setting of the thrust roller bearing enables the intermediate layer tray to be supported while being able to rotate relative to the outer spindle disk.

[0013] A plurality of inner layer doubling spindles are uniformly arranged around the axis of the outer layer doubling spindle.

[0014] Optionally, the nested doubling spindle includes a driving motor. A first transmission mechanism is connected between the driving motor and the outer layer doubling spindle, and a second transmission mechanism is connected between the outer layer doubling spindle and the inner layer doubling spindle. The first transmission mechanism is a gear transmission or a belt transmission, and the second transmission mechanism is a gear transmission or a belt transmission. Mechanical transmission is reliable in operation and low in cost. By adjusting the transmission ratio and meshing relationship of the gear or belt transmission, the rotation speed and twist direction of each inner layer doubling spindle of the nested doubling spindle can be adjusted, so as to meet the process requirements such as differential twist design.

[0015] Optionally, a plurality of the inner layer doubling spindles are respectively driven by motors independently. Since the speeds and rotation directions of the motors can be freely adjusted, greater freedom can be provided for process design and product development. By adjusting the motor parameters through the equipment control system, the process adjustment is more convenient and fast.

[0016] Advantages: Compared with the prior art, the present utility model has the following remarkable advantages: 1. The nested doubling spindle of the present application can perform single or multiple doubling operations on single or multiple cheese yarns, and combine and twist them into ply yarns with different structures. It can also be used as an ordinary doubling spindle and a yarn combining machine, with high production adaptability; 2. The nested doubling spindle of the present application has three functions: single doubling, combining, and double doubling. Compared with the existing textile technology, the present application can achieve an efficient short process integrating the three spinning processes of doubling, yarn combining, and doubling, solving the problems of multiple equipment, more labor, long time, and high energy consumption in the post-processing of yarns, improving the modernization level of textile production, and facilitating the transformation and upgrading of traditional industries; 3. The nested doubling spindle of the present application can adjust the twist speed and twist direction through different designs of the transmission structure, so as to further meet the production requirements of different yarns; 4. Through the nested doubling spindle of the present application, the production of differentiated and diversified products can be realized, with high flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural view of the nested doubling spindle of the present utility model;

[0018] Figure 2 is a top view of the nested doubling spindle of the present utility model;

[0019] Figure 3 is a schematic diagram of the principle of the first transmission mechanism and the second transmission mechanism of the present utility model;

[0020] Figure 4 is a schematic diagram of three yarn guiding methods of the nested doubling spindle of the present utility model;

[0021] Figure 5 is a schematic diagram of the principle of the first transmission mechanism and the second transmission mechanism of the present utility model;

[0022] Figure 6 is a schematic diagram of the principle of the first transmission mechanism and the second transmission mechanism of the present utility model;

[0023] Figure 7 is a schematic diagram of the principle of the first transmission mechanism and the second transmission mechanism of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The technical solutions of the present utility model will be further described below with reference to the accompanying drawings.

[0025] Embodiment 1: As shown in Figure 1 and Figure 2As shown in the figure, the nested doubling spindle of the present utility model includes a driving motor M1, a first transmission mechanism, an outer doubling spindle 1, an outer tray 6, an outer yarn bobbin, an outer yarn guide hook 5, an intermediate tray 7, an intermediate yarn bobbin, an inner yarn guide hook 4, an inner doubling spindle 2, an inner tray 8, an inner yarn bobbin, and a second transmission mechanism. The inner doubling spindles 2 are provided in four numbers and are evenly distributed around the axis of the outer doubling spindle 1.

[0026] The inner doubling spindle 2 includes an inner spindle main shaft 21, an inner spindle disk 22, and an inner spindle tube 23 that are coaxially arranged and connected in sequence. The inner spindle tube 23 is a hollow structure with a cavity. The inner spindle disk 22 is provided with a radial channel extending from the center to the edge. The cavity of the inner doubling spindle 2 communicates with the radial channel, thereby forming a first yarn guiding channel. Similarly, the outer doubling spindle 1 also includes an outer spindle main shaft 11, an outer spindle disk 12, and an outer spindle tube 13 that are coaxially arranged and connected in sequence. The cavity of the outer spindle tube 13 communicates with the radial channel of the outer spindle disk 12, thereby forming a second yarn guiding channel.

[0027] The outer tray 6, the outer yarn bobbin, the intermediate tray 7, the intermediate yarn bobbin, and the outer doubling spindle 1 are coaxially arranged. The inner tray 8, the inner yarn bobbin, and the inner doubling spindle 2 are coaxially arranged. Each layer of yarn bobbin is fixedly connected to the corresponding tray. The outer tray 6 is fixed to the frame and is rotationally connected to the outer spindle main shaft 11 through a bearing; the intermediate tray 7 is rotationally connected to the outer spindle tube 13 and the inner spindle main shaft 21 through bearings; the inner tray 8 is rotationally connected to the inner spindle tube 23, thereby forming a nested structure layer by layer. Magnetic attraction devices 9 are installed on the outer yarn bobbin, the intermediate yarn bobbin, and the inner yarn bobbin at corresponding positions. The number of inner yarn guide hooks 4 corresponds to the number of inner doubling spindles 2, and they are all fixedly installed on the intermediate yarn bobbin. The end for guiding the yarn is coaxially arranged with the inner doubling spindle 2. A thrust roller bearing is installed between the intermediate tray 7 and the outer spindle disk 12 of the outer doubling spindle 1. The thrust roller bearing is used to bear the axial force, that is, to support the intermediate tray 7 axially and allow the intermediate tray 7 to rotate relative to the outer spindle disk 12.

[0028] The driving motor is connected to the outer doubling spindle 1 through the first transmission mechanism, so as to drive the outer doubling spindle 1; a second transmission mechanism is connected between the outer doubling spindle 1 and the inner doubling spindle 2, and the second transmission mechanism drives the inner doubling spindle 2 to rotate.

[0029] As Figure 3As shown in the figure, in this embodiment, both the first transmission mechanism and the second transmission mechanism adopt gear transmission. The first transmission mechanism includes a gear Z1 fixedly connected to the driving motor and a gear Z2 fixedly connected to the outer - layer doubling spindle 1. The gear Z1 and the gear Z2 are externally meshed. The second transmission mechanism includes a gear Z3 fixedly connected to the gear Z2 and coaxially arranged, and a gear Z4 fixedly connected to the inner - layer doubling spindle 2 and coaxially arranged. The gear Z3 and the gear Z4 are externally meshed. Specifically, the rotational speed of the driving motor N1 is n, the linear speed of the winding roller 10 is v, the rotational speed of the outer - layer doubling spindle 1 is n1, and the speed of the inner - layer doubling spindle 2 is n2. The twisting twist of the outer - layer doubling spindle 1 is T1, and the twisting twist of the inner - layer doubling spindle 2 is T2. Since the gear Z3 and the gear Z4 are externally meshed, the rotation directions of the two gears are opposite. Therefore, the directions of the twisting twist T1 of the outer - layer doubling spindle 1 and the twisting twist T2 of the inner - layer doubling spindle 2 are opposite.

[0030] As Figure 1 and Figure 4 shown, when using the above - mentioned nested doubling spindles for spinning, a bobbin yarn 3 needs to be sleeved on each inner - layer doubling spindle 2. The driving motor drives the first transmission mechanism to drive the outer - layer doubling spindle 1 to rotate, and the second transmission mechanism drives the inner - layer doubling spindle 2 to rotate. Using the above - mentioned nested doubling spindles, at least three different - structured multi - strand yarns can be formed as follows:

[0031] Structure 1: All yarns go through double - twisting twice. Specifically, the yarn of the bobbin yarn 3 on the inner - layer doubling spindle 2 passes through the top of the inner - layer spindle tube 23, the intersection of the inner - layer spindle tube 23 and the inner - layer spindle disk 22, and the inner - layer yarn guide hook 4 in sequence, that is, after the yarn - guiding route of A→B→C, one - turn double - twisting is realized; the four bobbin yarns 3 are respectively twisted by the four inner - layer doubling spindles 2 and then merged into the top of the outer - layer spindle tube 13, and pass through the intersection of the outer - layer spindle tube 13 and the outer - layer spindle disk 12 and the outer - layer yarn guide hook 5 in sequence, that is, after the yarn - guiding route of D→E→F, double - twisting is realized again, and a compound - twisted yarn is formed at point F.

[0032] Structure 2: All yarns are doubled once through the inner - layer doubling spindle 2, but some yarns do not go through the twisting of the outer - layer doubling spindle 1. Specifically, the yarn of some bobbin yarns 3 passes through the yarn - guiding routes of A→B→C and D→E→F in sequence to realize double - twisting twice. The yarn of the bobbin yarn 3 of the remaining inner - layer doubling spindles 2 directly passes through C→F from the inner - layer yarn guide hook 4 to the outer - layer yarn guide hook 5 without going through the twisting of the outer - layer doubling spindle 1 after passing through the yarn - guiding route of A→B→C, and then is re - twisted with the yarn that has gone through double - twisting to form a core - spun yarn. The core yarn has been doubled for the first time. The covering yarns are first doubled separately to form yarns, and multiple covering yarns are combined and then doubled for the second time to form a single compound - twisted yarn. The compound - twisted yarn is wrapped around the core yarn to complete the production of the core - spun yarn.

[0033] Structure three: Part of the cheese 3 is neither twisted by the inner - layer doubling spindle 2 nor by the outer - layer spindle, and the remaining cheeses 3 are doubled - twisted twice. Specifically, the yarn of part of the cheese 3 passes through the yarn - guiding routes of A→B→C and D→E→F in sequence to achieve double - twisting. The remaining cheeses 3 directly pass through C→F, reach the outer - layer yarn - guiding hook 5 from the inner - layer yarn - guiding hook 4, and are re - twisted together with the yarn that has been double - twisted to form a covered core ply yarn. This core yarn has not undergone the first doubling - twist, so this core yarn has no twist (excluding the case where the core yarn itself has twist). The covering yarns are first doubled - twisted separately to form ply yarns, and multiple covering yarns are combined and then second - twisted to form a single complex - twisted ply yarn. The complex - twisted ply yarn is covered on the core yarn to complete the production of the covered core ply yarn. The difference between this covered core ply yarn and the covered core ply yarn in Structure Two mainly lies in whether the core yarn has twist (excluding the case where the core yarn itself has twist).

[0034] The above - mentioned three - structure ply yarns have significant differences, and their physical properties such as strength and elongation indexes are different. Using the above - mentioned nested doubling spindles can achieve differential ply - yarn design and product development, with good flexibility and high production efficiency. A winding roller 10 is arranged downstream of the nested doubling spindles, and the winding roller 10 can wind up the yarn output by the nested doubling spindles.

[0035] Example 2: As Figure 5 shown, the difference between this example and Example 1 is that the second transmission mechanism is a gear - toothed - belt drive. The second transmission mechanism includes gears Z3, Z4, Z5, Z6, Z7, Z8. Gear Z3 is fixedly connected and coaxially arranged with gear Z2 of the first transmission mechanism. Gear Z4 is externally meshed with gear Z3. Gear Z4 and gear Z5 are coaxially arranged and fixedly connected. Gears Z5, Z6, Z7, Z8 are driven by a toothed belt. Gears Z5, Z6, Z7, Z8 are respectively coaxially arranged and fixedly connected with the inner - layer doubling spindles 2. Specifically, the rotational speed of the driving motor M1 is n, the linear speed of the winding roller 10 is v, the rotational speed of the outer - layer doubling spindle 1 is n1, and the rotational speeds of gears Z4 and Z5 are n2. The doubling twist of the outer - layer doubling spindle 1 is T1, and the doubling twist of the inner - layer doubling spindle 2 is T2. In this transmission - system design, different configurations of the speeds of different inner - layer doubling spindles 2 can be achieved through the design of the number of teeth of gears such as Z5, Z6, Z7, Z8 to meet the technological requirements of differential twist design. Since gears Z3 and Z4 are externally meshed, the rotation directions of the two gears are opposite. Therefore, the directions of the doubling twists T1 of the outer - layer doubling spindle 1 and T2 of the inner - layer doubling spindle 2 are opposite.

[0036] Example 3: As Figure 6As shown in the figure, the difference between this embodiment and Embodiment 2 is that the gears Z3 and Z4 are driven by a toothed belt. Since the gears Z3 and Z4 are in internal meshing and the rotation directions of the two gears are the same, the twisting directions of the outer - layer doubling spindle 1, i.e., the twisting twist T1, and the inner - layer doubling spindle 2, i.e., the twisting twist T2, are the same.

[0037] Embodiment 4: As Figure 7 shown in the figure, the difference between this embodiment and Embodiment 1 is that the second transmission mechanism consists of four independent motors M2, M3, M4, and M5, and the four inner - layer doubling spindles 2 are respectively driven independently by the independent motors. Since the speeds and rotation directions of the independent motors can be freely adjusted, it can provide greater freedom for process design and product development. By adjusting the motor parameters through the equipment control system, the process adjustment becomes more convenient and fast.

[0038] In mechanical transmission systems such as gears and toothed belts, the speed adjustment of the inner and outer - layer doubling spindles depends on the transmission ratio of the gears and toothed belts, and the rotation directions of the inner and outer - layer doubling spindles are also greatly restricted. Therefore, there are certain limitations in the speed and direction configuration of this mechanical transmission form for the inner and outer - layer doubling spindles. Replacing gears also requires a certain amount of time and labor. So, Embodiments 1 to 3 are suitable for large - scale use by enterprises with relatively single product varieties, which is beneficial to saving manufacturing costs. Using multiple independent motors for independent transmission and adopting a PLC and computer control system enable the speed and direction of the inner and outer - layer doubling spindles to be controlled by programs, realizing the digitalization of process adjustment. Therefore, Embodiment 4 is suitable for enterprises with more product varieties and frequent variety adjustments.

[0039] The cheese yarn of this application can be configured according to requirements. In some embodiments, 4 inner - layer doubling spindles 2 are used, and one cheese yarn is arranged in each inner - layer doubling spindle 2. The specifications of the cheese yarns are as follows: the PET filament with the parameter of FDY5.5tex / 72F. Each cheese yarn passes through the inner - layer doubling spindle 2 and the outer - layer doubling spindle 1. Each inner - layer doubling spindle 2 is driven by an independent motor. The speed of the winding roller 10 is 15m / min, the speed of the inner - layer doubling spindle 2 is 6700r / min and rotates clockwise, and the speed of the outer - layer doubling spindle 1 is 4000r / min and rotates counter - clockwise to process the PET filament compound - twisted ply yarn of 5.5tex×4. Among them, the single - filament twist is 893 twists / m, Z - twist; the ply - yarn twist is 533 twists / m, S - twist.

[0040] In some embodiments, two inner - doubling spindles 2 are adopted. Combed pure - cotton yarn is arranged in each inner - doubling spindle 2. Two cheese yarns of JC9.8tex after being combined by a beam - warping machine are used. Each cheese yarn passes through the inner - doubling spindle 2 and the outer - doubling spindle 1. Each inner - doubling spindle 2 is driven by an independent motor. The speed of the winding roller 10 is 25 m / min, the speed of the inner - doubling spindle 2 is 9300 r / min and rotates counter - clockwise, and the speed of the outer - doubling spindle 1 is 5600 r / min and rotates clockwise to process a double - twisted ply yarn of JC9.8tex×2×2. Among them, the twist direction of JC9.8tex is Z - twist; the twist of JC9.8tex×2 is about 744 twists / m and is S - twist; the twist of the JC9.8tex×2×2 double - twisted ply yarn is 448 twists / m and is Z - twist.

[0041] In some embodiments, four inner - doubling spindles 2 are adopted. Combed pure - cotton cheese yarn is arranged only in one inner - doubling spindle 2. Two cheese yarns of JC9.8tex after being combined by a beam - warping machine pass through the inner - doubling spindle 2 and the outer - doubling spindle 1. Each inner - doubling spindle 2 is driven by an independent motor. Only the inner - doubling spindle 2 with the combed pure - cotton cheese yarn rotates, and the other inner - doubling spindles 2 do not rotate. The speed of the winding roller 10 is 40 m / min, the speed of the inner - doubling spindle 2 is 9000 r / min and rotates counter - clockwise, and the speed of the outer - doubling spindle 1 is 6000 r / min and rotates counter - clockwise to process a ply yarn of JC9.8tex×2. The twist of JC9.8tex×2 is about 750 twists / m, the twist direction of JC9.8tex is Z - twist, and the twist direction of JC9.8tex×2 is S - twist.

[0042] In some embodiments, four inner - doubling spindles 2 are adopted. One cheese filament is respectively arranged in three of the inner - doubling spindles 2, and the specification of the cheese filament is FDY5.5tex / 72F PET filament; a JC18.5tex cheese yarn is arranged in one inner - doubling spindle 2. The three FDY5.5tex / 72F PET filaments respectively pass through the inner - doubling spindle 2 and the inner yarn - guiding hook 4 in sequence to complete the first doubling, and then are combined together and pass through the outer - doubling spindle 1 and the outer - spindle yarn - guiding hook 5 to complete the second doubling to form a 5.5tex×3 PET - filament ply yarn; the JC18.5tex cheese yarn passes through the inner yarn - guiding hook 4 and the outer - spindle yarn - guiding hook 5 in sequence, and is combined and twisted with the 5.5tex×3 PET - filament ply yarn at the outer - spindle yarn - guiding hook 5 to form a composite - structure core - spun yarn. The characteristic of this composite - structure core - spun yarn is that JC18.5tex is used as the core yarn and is not twisted again, and is covered by the 5.5tex×3 PET - filament ply yarn in the middle.

[0043] In some embodiments, four inner - layer doubling spindles 2 are adopted. One FDY7.7tex / 72F PET filament cheese is respectively arranged in two of the inner - layer doubling spindles 2, and they are symmetrically distributed; one FDY7.7tex / 48F PA56 filament cheese is arranged in the other two inner - layer doubling spindles 2, and they are symmetrically distributed. The two FDY7.7tex / 72F PET filament cheeses respectively pass through the inner - layer doubling spindles 2 and the inner - layer yarn guide hooks 4 in sequence to complete the first doubling, and then are combined together and pass through the outer - layer doubling spindle 1 and the outer - layer spindle yarn guide hook 5 to complete the second doubling to form a 7.7tex×2 PET filament ply yarn; the two FDY7.7tex / 48F PA56 filament cheeses pass through the inner - layer doubling spindles 2 and the inner - layer yarn guide hooks 4 in sequence to complete the first doubling to form two FDY7.7tex / 48F PA56 twisted filaments, which are directly fed into the outer - layer yarn guide hook, and are combined with the 7.7tex×2 PET filament ply yarn to be twisted into a composite - structure core - spun ply yarn. The characteristic of this composite - structure core - spun ply yarn is that two FDY7.7tex / 48F PA56 filaments form two twisted filaments after the first doubling by the inner - layer spindles. The two twisted filaments are combined together as the core yarn without being twisted again, and are covered by the 7.7tex×2 PET filament ply yarn in the middle. This composite - structure core - spun ply yarn uses two fiber materials to form a core - spun ply yarn with a composite structure at one time. Moreover, the core yarn is formed by combining two filaments that are respectively twisted, and then covered by a PET filament ply yarn that has been doubled and twisted twice, with a unique structure.

[0044] The above - mentioned embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent substitution on some or all of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A nested two-for-one twisting spindle, characterized in that: The invention comprises an outer double-twisting spindle (1) and at least one inner double-twisting spindle (2) arranged outside the outer double-twisting spindle (1); the inner double-twisting spindle (2) is used for sleeve-arranging a bobbin yarn (3); the inner double-twisting spindle (2) is correspondingly provided with an inner yarn guide hook (4); the inner double-twisting spindle (2) and the inner yarn guide hook (4) are configured to be able to double-twist the bobbin yarn (3) to form a double-twisted yarn; the outer double-twisting spindle (1) is correspondingly provided with an outer yarn guide hook (5); the outer double-twisting spindle (1) and the outer yarn guide hook (5) are configured to be able to perform a secondary double-twisting on the double-twisted yarn.

2. The nested two-for-one twisting spindle according to claim 1, characterized in that: The inner layer two-for-one twisting spindle (2) comprises an inner layer spindle main shaft (21), an inner layer spindle disk (22) and an inner layer spindle tube (23) which are coaxially arranged in sequence, the inner layer spindle tube (23) is used to sleeve the bobbin yarn (3), the cavity of the inner layer spindle tube (23) is connected with the radial channel of the inner layer spindle disk (22), thereby forming a first yarn guide channel; the outer layer two-for-one twisting spindle (1) comprises an outer layer spindle main shaft (11), an outer layer spindle disk (12) and an outer layer spindle tube (13) which are coaxially arranged in sequence, the cavity of the outer layer spindle tube (13) is connected with the radial channel of the outer layer spindle disk (12), thereby forming a second yarn guide channel.

3. The nested two-for-one twisting spindle according to claim 2, characterized in that: The invention comprises an outer tray (6), an intermediate tray (7) and an inner tray (8); the outer tray (6), the intermediate tray (7) and the outer two-for-one twisting spindle (1) are coaxially arranged, and the inner tray (8) and the inner two-for-one twisting spindle (2) are coaxially arranged; the outer tray (6) is fixed to a frame and is rotatably connected to the outer spindle main shaft (11); the intermediate tray (7) is rotatably connected to the outer spindle tube (13) and the inner spindle main shaft (21); and the inner tray (8) is rotatably connected to the inner spindle tube (23).

4. The nested two-for-one twisting spindle according to claim 3, characterized in that: The outer layer tray (6), the middle layer tray (7) and the inner layer tray (8) are respectively fixed with an outer layer yarn tube, a middle layer yarn tube and an inner layer yarn tube; and magnetic suction devices (9) are installed at corresponding positions on the outer layer yarn tube, the middle layer yarn tube and the inner layer yarn tube.

5. The nested two-for-one twisting spindle according to claim 3, characterized in that: A thrust roller bearing is installed between the middle layer tray (7) and the outer layer spindle disc (12) of the outer layer two-for-one twisting spindle (1).

6. The nested two-for-one twisting spindle according to claim 1, characterized in that: The inner layer two-for-one twisting spindles (2) are evenly arranged in a plurality around the axis of the outer layer two-for-one twisting spindles (1).

7. The nested two-for-one twisting spindle according to claim 6, characterized in that: The invention comprises a driving motor, a first transmission mechanism is connected between the driving motor and the outer-layer two-for-one twisting spindle (1), a second transmission mechanism is connected between the outer-layer two-for-one twisting spindle (1) and the inner-layer two-for-one twisting spindle (2), the first transmission mechanism is a gear transmission or a belt transmission, and the second transmission mechanism is a gear transmission or a belt transmission.

8. The nested two-for-one twisting spindle according to claim 6, characterized in that: The plurality of inner layer two-for-one twisting spindles (2) are driven individually by motors.

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