Bidirectional rubber ring super-large drafting device and method

Abstract

The present invention belongs to the field of spinning technology, and relates to a bidirectional rubber ring super-large drafting device and method. A bidirectional rubber ring super-large drafting device comprises a rear upper rubber ring, a front upper rubber ring, a lower rubber ring, a tensioner, and a rear rubber roller, a rear upper pin, a middle first rubber roller, a middle second rubber roller, a front upper pin, a front rubber roller arranged at intervals along the running direction of the fiber whisker, and a rear roller, a rear lower pin, a middle roller, a front lower pin, and a front roller arranged at intervals along the running direction of the fiber whisker; the method is to use a bidirectional rubber ring super-large drafting device as described above, and the raw material is a twisted fiber whisker; the distance between the rear roller jaws and the rear rubber ring jaws is 5-10mm smaller than the quality length of the fiber of the twisted fiber whisker. The method of the present invention can achieve super-large drafting; it can be modified on the basis of a three-roller bidirectional rubber ring drafting device, and has low energy consumption; it can prevent the coarse yarn from being difficult to decompose in the rear drafting zone; the probability of accidental drafting is small; the rotation is stable and the service life is long; it can meet the needs of different spinning varieties.

Description

Technical Field

[0001] The invention belongs to the technical field of spinning, and relates to an ultra-large drafting device and method, in particular to a bidirectional rubber ring ultra-large drafting device and method. Background Art

[0002] In the production process of synthetic fibers such as polyester fibers, in order to orient the molecular chains along the fiber axis and thus improve the mechanical properties and crystallinity of the fibers, the fibers often need to be stretched. Therefore, it is of great significance to study stretching devices and methods.

[0003] The prior art generally uses a bidirectional rubber ring drafting device for drafting. The bidirectional rubber ring drafting device can be divided into two types: a three-roller type and a four-roller type. The three-roller bidirectional rubber ring drafting device cannot meet the requirements for the friction force boundary in the rear area when the rear area has a large draft multiple (2-5 times), and thus cannot achieve super-large drafting. The four-roller bidirectional rubber ring drafting device, for example, discloses a super-large drafting spinning method and a device using the method in the patent application with patent publication number CN109610052A, such as Figure 1 As shown, the device consists of a rear roller 1, a rear top roller 2, a first middle top roller 3, a first middle roller 4, a rear upper pin rack 5, a rear lower pin bar 6, a rear upper rubber ring 7, a rear lower rubber ring 8, a buncher 9, a second middle top roller 10, a second middle roller 11, a front upper pin rack 12, a front lower pin bar 13, a front upper rubber ring 14, a front lower rubber ring 15, a front top roller 16, a front roller 17, a rear tensioner 18 and a front tensioner 19. The four pairs of rollers and top rollers are moved along the twisted fiber strips. The fibers are arranged in a row direction with spacing and arranged up and down. The method is to pass the twisted fiber strips through the rear stretching zone, the middle stretching zone and the front stretching zone in turn, and double rubber ring stretching is used in the rear stretching zone and the front stretching zone respectively. The friction boundaries of the front stretching zone and the rear stretching zone are completely independent and do not affect each other. The rear stretching zone is affected by the reverse rubber ring friction boundary, so that the fiber speed change points in the front stretching zone and the rear stretching zone are stable and concentrated, and at the same time they are gathered in the middle stretching zone to achieve super large stretching.

[0004] However, this type of drafting device still has the following disadvantages: First, it adopts a four-roller structure, which adds a pair of rollers compared to the traditional three-roller drafting device, making the overall device complicated and difficult to directly transform on the basis of the traditional three-roller drafting device. At the same time, with the increase in the number of rollers, the energy consumption also increases accordingly; second, this four-roller drafting device has a middle drafting zone between the two middle pairs of rollers, and due to the limitation of the position of the drafting components in the middle drafting zone, the spacing between the rollers in the middle drafting zone is large, so that the fiber strands can only gather in the middle drafting zone and are less controlled, affecting the spinning quality.

[0005] Therefore, it is necessary to develop a three-roller bidirectional rubber ring drafting device that can achieve super-large drafting. Summary of the invention

[0006] The purpose of the present invention is to solve the problems existing in the prior art and to provide a bidirectional rubber ring super-large drafting device and method.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A bidirectional rubber ring super-large drafting device, comprising a rear rubber roller, a rear upper pin, a middle first rubber roller, a middle second rubber roller, a front upper pin, and a front rubber roller arranged at intervals along the running direction of the fiber strands;

[0009] It also includes a rear roller, a rear lower pin, a middle roller, a front lower pin, and a front roller arranged at intervals in the running direction of the fiber strands;

[0010] The rear rubber roller and the rear roller are arranged up and down and the two form a rear roller jaw, the rear upper pin and the rear lower pin are arranged up and down, the front upper pin and the front lower pin are arranged up and down, and the front rubber roller and the front roller are arranged up and down and the two form a front roller jaw;

[0011] It also includes a rear upper rubber ring, a front upper rubber ring, a lower rubber ring, and a tensioner;

[0012] The rear upper rubber ring is simultaneously mounted on the rear upper pin and the middle rubber roller, the front upper rubber ring is simultaneously mounted on the middle rubber roller and the front upper pin, and the tensioner is located below the middle roller;

[0013] The number of middle roller, lower rubber ring and tensioner is one;

[0014] The middle roller is located below the first middle rubber roller and the second middle rubber roller, and is tangent to the first middle rubber roller and the second middle rubber roller at the same time. The middle roller and the first middle rubber roller form the first middle roller nip, and the middle roller and the second middle rubber roller form the second middle roller nip. The rear drafting area is between the rear roller nip and the first middle roller nip, the middle drafting area is between the first middle roller nip and the second middle roller nip, and the front drafting area is between the second middle roller nip and the front roller nip.

[0015] The lower rubber ring is simultaneously mounted on the rear lower pin, the middle roller, the front lower pin and the tensioner. The tensioner makes the lower rubber ring fit with the rear upper rubber ring, the middle roller and the front upper rubber ring respectively during operation.

[0016] The rear upper rubber ring and the lower rubber ring form a rear rubber ring jaw at the rear ends of the rear upper pin and the rear lower pin.

[0017] As the preferred technical solution:

[0018] In the bidirectional rubber ring super-large drafting device as described above, the diameter of the rear roller is 25-33mm, the diameter of the middle roller is 55-65mm, and the diameter of the front roller is the same as the diameter of the rear roller; wherein, the diameters of the rear roller and the front roller are the same as those in the prior art, and the diameter of the middle roller is larger than that in the prior art. On the one hand, since the middle roller is located below the first and second middle rubber rollers, and is tangent to the first and second middle rubber rollers at the same time, only a larger diameter of the middle roller can meet the installation requirements. On the other hand, the diameter of the middle roller is 55-65mm, which can meet the requirements of adjusting the length of the center drafting zone.

[0019] The present invention also provides a bidirectional rubber ring super-large drafting spinning method, which adopts a bidirectional rubber ring super-large drafting device as described above, and the raw material is a twisted fiber strand, and the twisted fiber strand passes through a rear drafting zone, a middle drafting zone, and a front drafting zone in sequence, and a reverse-extending double rubber ring drafting form is adopted in the rear drafting zone, and a forward-extending double rubber ring drafting form is adopted in the front drafting zone;

[0020] The mass length of the fiber of the twisted fiber strand is recorded as L;

[0021] The distance between the rear roller jaws and the rear rubber ring jaws is 5-10mm smaller than L; the movement process of the fiber in the rear drafting zone is that the fiber head end leaves the rear roller jaws first. Since the entire fiber is held by the rear roller jaws at this time, the overall speed of the fiber is the same as the speed of the rear roller, recorded as v2. When the fiber head end reaches the rear rubber ring jaws, the fiber head end will be held by the rear rubber ring jaws, and the movement speed v1 of the rear upper rubber ring is greater than the movement speed v2 of the rear roller. At this time, the speed of the fiber head end becomes v1, and the speed of the fiber tail end remains at v2 because the fiber tail end has not yet left the rear roller jaws. Since v1>v2, the speed of the fiber head end is greater than the speed of the fiber tail end, and the fiber will be straightened. When the fiber remains straightened, the force exerted by the rear roller jaws on the fiber is greater than the force exerted by the rear rubber ring jaws on the fiber. The tail end of the fiber is held by the rear roller jaws. At this time, the rear rubber ring jaws and the rear roller jaws exert a greater force on the fiber. The fiber generates tension until the tail end of the fiber breaks away from the rear roller jaws and when the control force exerted by the slow fiber on the tail end of the fiber is less than the guiding force exerted by the fast fiber on it, the tail end changes speed and the overall speed change of the fiber is completed; when the distance between the rear roller jaws and the rear rubber ring jaws is greater than L, the reverse extended double rubber ring drafting form will be the same as the simple roller drafting form, and the fiber speed change point cannot be concentrated. Therefore, the distance between the rear roller jaws and the rear rubber ring jaws must be less than L, but if the difference between the distance between the rear roller jaws and the rear rubber ring jaws and L is too small, the tension of the rear rubber ring jaws and the rear roller jaws on the fiber will continue for too long, and the tension will accumulate and increase, causing the fiber to break. Therefore, the difference between the distance between the rear roller jaws and the rear rubber ring jaws and L should be kept within a reasonable range, that is, to ensure the concentration of the fiber speed change points and to ensure that the fiber is not damaged or broken in the drafting area.

[0022] As the preferred technical solution:

[0023] In the bidirectional rubber ring super-large draft spinning method as described above, the arc length of the surface of the middle roller between the first middle roller jaws and the second middle roller jaws is 2-3mm larger than L. The purpose is to allow the fiber to rotate freely in this interval, and there will be no difficulty in untwisting the coarse yarn in the rear drafting zone, thereby reducing the coarse sections. At the same time, it is beneficial to control the fiber strands in the middle drafting zone and reduce the probability of accidental drafting.

[0024] In the bidirectional rubber ring super-large draft spinning method as described above, the basis weight of the twisted fiber strands is 20-30g / 10m.

[0025] In the bidirectional rubber ring super-large draft spinning method as described above, the twist of the twisted fiber whiskers is 50-70 twists / m, the drafting multiple of the rear drafting zone is 2-4 times, the drafting multiple of the front drafting zone is 60-120 times, and the total drafting multiple of the entire drafting zone is 200-300 times; the twist of the twisted fiber whiskers is set at 50-70 twists / m, which can fully ensure that the fiber whiskers have a good internal friction force field when being drafted in the drafting zone, which is beneficial to the concentration of the fiber speed change points. When the twist is large, the fiber whiskers cannot be pulled apart. When the twist of the whiskers is small, under the action of the 2-4 times drafting multiple in the rear drafting zone, the internal friction force field of the fiber whiskers is severely damaged, and the drafting multiple in the front drafting zone cannot be increased. Therefore, the twist is within this range, and combined with the drafting multiple in the rear drafting zone, it is also one of the conditions for increasing the drafting multiple in the front drafting zone.

[0026] The bidirectional rubber ring super-large draft spinning method as described above is characterized in that the drafting multiple in the middle drafting zone is 1.

[0027] In the bidirectional rubber ring super-large draft spinning method as described above, the pressure between the rear roller and the rear rubber roller is 100-120N, the pressure between the middle roller and the middle first rubber roller is 130-150N, the pressure between the middle roller and the middle second rubber roller is 130-150N, and the pressure between the front roller and the front rubber roller is 110-120N; the pressure between the two middle rubber rollers and the middle roller is relatively large, the purpose of which is to increase the friction boundary in the middle zone, reduce the slipperiness of the rubber ring, and thus reduce the beating phenomenon of the coarse yarn.

[0028] A bidirectional rubber ring super-large draft spinning method as described in any of the above items, the yarn count obtained by spinning is 40-80 Ne, the CV value of the yarn is 3-5%, the number of +50% thick sections is 1-3 pieces / km, and the number of -50% thin sections is 1-3 pieces / km.

[0029] Beneficial Effects

[0030] (1) The bidirectional apron super-large draft spinning method of the present invention adopts a double apron drafting form of reverse extension in the rear drafting zone and a double apron drafting form of forward extension in the front drafting zone, thereby achieving super-large drafting.

[0031] (2) The bidirectional rubber ring super-large drafting device of the present invention adopts a three-roller type, and the overall device has the same structure as the existing three-roller bidirectional rubber ring drafting device, which is more conducive to direct modification based on the existing three-roller bidirectional rubber ring drafting device. Compared with the four-roller bidirectional rubber ring drafting device, the energy consumption of the present invention is low.

[0032] (3) The front stretching zone and the rear stretching zone of the bidirectional rubber ring super-large stretching device of the present invention are separated and independent of each other and do not affect each other, so that the friction force boundaries of the front stretching zone and the rear stretching zone are completely independent, which is more conducive to the separate adjustment of the friction force boundaries of the front stretching zone and the rear stretching zone to meet the needs of different spinning varieties.

[0033] (4) For the bidirectional rubber ring super-large drafting device of the present invention, the fiber strands can rotate freely in the area between the middle second rubber roller and the middle first rubber roller, and will not make it difficult for the coarse yarn to decompose in the post-drafting area.

[0034] (5) For the bidirectional rubber ring super-large drafting device of the present invention, the fiber whiskers between the middle second rubber roller and the middle first rubber roller can form a curve on the surface of the middle roller, and the length of the curve is shorter, which is more conducive to controlling the fiber whiskers in the middle drafting area, and the probability of accidental drafting is lower.

[0035] (6) The lower rubber ring of the bidirectional rubber ring super-large drafting device of the present invention is subjected to pressure from two different points, namely the middle second rubber roller and the middle first rubber roller, during operation. The lower rubber ring rotates more smoothly, is less prone to wear, and has a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of a four-roller bidirectional rubber ring drafting device of the prior art CN109610052A;

[0037] Figure 2 It is a structural schematic diagram of the bidirectional rubber ring super-large drafting device of the present invention;

[0038] In the figure, 1-rear roller, 2-rear leather roller, 3-first middle leather roller, 4-first middle roller, 5-rear upper pin rack, 6-rear lower pin rod, 7-rear upper rubber ring, 8-rear lower rubber ring, 9-clustering device, 10-second middle leather roller, 11-second middle roller, 12-front upper pin rack, 13-front lower pin rod, 14-front upper rubber ring, 15-front lower rubber ring, 16-front leather roller, 17-front roller, 18-rear tensioner, 19-front tensioner, 20-middle roller, 21-rear rubber roller, 22-middle first rubber roller, 23-middle second rubber roller, 24-front rubber roller, 25-lower rubber ring, 26-rear upper pin, 27-front upper pin, 28-rear lower pin, 29-front lower pin, 30-tensioner. DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0040] The following are the test methods for the relevant performance indicators in each embodiment and comparative example:

[0041] Yarn count: The test was conducted using a YG086 yarn length measuring machine, with a sampling length of 100 m / piece and 5 sampling times to calculate the average value.

[0042] CV value of yarn evenness, number of -50% thin sections, number of +50% thick sections: tested in accordance with standard GB / T 3292.1-2008, using the CT3000 yarn evenness test analyzer from Shaanxi Changling Textile Electromechanical Technology Co., Ltd.

[0043] Example 1A

[0044] A bidirectional rubber ring super-large drafting device, such as Figure 2 As shown, it is composed of a rear upper rubber ring 7, a front upper rubber ring 14, a lower rubber ring 25, a tensioner 30, a rear rubber roller 21, a rear upper pin 26, a middle first rubber roller 22, a middle second rubber roller 23, a front upper pin 27, a front rubber roller 24 arranged at intervals along the running direction of the fiber whiskers, and a rear roller 1, a rear lower pin 28, a middle roller 20, a front lower pin 29, and a front roller 17 arranged at intervals along the running direction of the fiber whiskers;

[0045] The rear rubber roller 21 and the rear roller 1 are arranged up and down and the two form a rear roller jaw, the rear upper pin 26 and the rear lower pin 28 are arranged up and down, the front upper pin 27 and the front lower pin 29 are arranged up and down, and the front rubber roller 24 and the front roller 17 are arranged up and down and the two form a front roller jaw;

[0046] The rear upper rubber ring 7 is simultaneously sleeved on the rear upper pin 26 and the middle first rubber roller 22, the front upper rubber ring 14 is simultaneously sleeved on the middle second rubber roller 23 and the front upper pin 27, and the tensioner 30 is located below the middle roller 20;

[0047] The number of the middle roller 20, the lower rubber ring 25, and the tensioner 30 is one;

[0048] The middle roller 20 is located below the first middle rubber roller 22 and the second middle rubber roller 23, and is tangent to the first middle rubber roller 22 and the second middle rubber roller 23 at the same time. The middle roller 20 and the first middle rubber roller 22 form a first middle roller jaw, and the middle roller 20 and the second middle rubber roller 23 form a second middle roller jaw. The rear drafting area is between the rear roller jaw and the first middle roller jaw, the middle drafting area is between the first middle roller jaw and the second middle roller jaw, and the front drafting area is between the second middle roller jaw and the front roller jaw.

[0049] The lower rubber ring 25 is simultaneously mounted on the rear lower pin 28, the middle roller 20, the front lower pin 29 and the tensioner 30;

[0050] The rear upper rubber ring 7 and the lower rubber ring 25 form a rear rubber ring jaw at the rear ends of the rear upper pin 26 and the rear lower pin 28;

[0051] The diameter of the rear roller 1 is 25 mm, the diameter of the middle roller 20 is 55 mm, and the diameter of the front roller 17 is the same as the diameter of the rear roller 1.

[0052] Example 1B

[0053] A bidirectional rubber ring super-large draft spinning method, the specific steps are as follows:

[0054] (1) Prepare raw materials;

[0055] Raw materials: twisted fiber whiskers, the fiber mass length of the twisted fiber whiskers is recorded as L, L is 28mm, the basis weight of the twisted fiber whiskers is 30g / 10m, and the twist of the twisted fiber whiskers is 50 twists / m;

[0056] (2) using a bidirectional rubber ring super-large drafting device provided in Example 1A to spin yarn;

[0057] The distance between the rear roller jaws and the rear rubber ring jaws is 5mm smaller than L;

[0058] The arc length of the surface of the middle roller 20 between the first middle roller jaw and the second middle roller jaw is 2 mm greater than L;

[0059] The drafting multiple of the rear drafting zone is 2 times, the drafting multiple of the middle drafting zone is 1 time, the drafting multiple of the front drafting zone is 100 times, and the total drafting multiple of the entire drafting zone is 200 times;

[0060] The pressure between the rear roller 1 and the rear rubber roller 21 is 100N, the pressure between the middle roller 20 and the middle first rubber roller 22 is 130N, the pressure between the middle roller 20 and the middle second rubber roller 23 is 130N, and the pressure between the front roller 17 and the front rubber roller 24 is 110N.

[0061] The yarn count finally spun was 40 Ne, the CV value of the yarn evenness was 3%, the number of +50% thick sections was 1 / km, and the number of -50% thin sections was 1 / km.

[0062] Comparative Example 1

[0063] A bidirectional apron draft spinning method is basically the same as that in Example 1B, except that the distance between the rear roller jaws and the rear apron jaws is 32 mm.

[0064] The yarn count finally spun was 40 Ne, the CV value of the yarn evenness was 8.3%, the number of +50% thick sections was 7.6 pieces / km, and the number of -50% thin sections was 8.2 pieces / km.

[0065] Compared with Example 1B, the CV value of the yarn of Example 1 increased by 176%, the number of +50% thick sections increased by 660%, and the number of -50% thin sections increased by 720%. The performance in these three aspects was greatly reduced. This is because L is 28 mm, and the distance between the rear roller jaws and the rear rubber ring jaws is 32 mm. When the distance between the rear roller jaws and the rear rubber ring jaws is greater than L, the fiber strands have a large free area in the post-stretching zone, the fiber speed change points are dispersed, and more accidental stretching is generated.

[0066] Comparative Example 2

[0067] A bidirectional apron draft spinning method is basically the same as that in Example 1B, except that the distance between the rear roller jaws and the rear apron jaws is 26 mm.

[0068] The yarn count finally spun was 40 Ne, the CV value of the yarn evenness was 3.8%, the number of +50% thick places was 8.9 / km, and the number of -50% thin places was 9.5 / km.

[0069] Compared with Example 1B, the CV value of the yarn evenness of Comparative Example 2 does not change much, but the number of +50% thick sections increases by 790%, and the number of -50% thin sections increases by 850%. The performance of the +50% thick sections and the -50% thin sections is greatly reduced. This is because L is 28 mm, and the distance between the rear roller jaws and the rear rubber ring jaws is 26 mm. When the difference between the distance between the rear roller jaws and the rear rubber ring jaws and the fiber quality length is too small, the fiber is not easy to rotate in the rear drafting zone, and it is difficult to untwist, and it is easy to produce the phenomenon of being unable to be pulled apart, resulting in an increase in the number of +50% thick sections and -50% thin sections.

[0070] Comparative Example 3

[0071] A bidirectional rubber ring super-large draft spinning method is basically the same as embodiment 1B, the only difference being that the arc length L of the surface of the middle roller between the first middle roller jaws and the second middle roller jaws is 1 mm smaller than that of the second middle roller jaws.

[0072] The yarn count finally spun was 40 Ne, the CV value of the yarn evenness was 3.4%, the number of +50% thick sections was 5.3 pieces / km, and the number of -50% thin sections was 4.8 pieces / km.

[0073] Compared with Example 1B, the CV value of the yarn evenness of Comparative Example 3 did not change much, and the number of +50% thick sections and -50% thin sections increased by 430% and 380%, respectively. This is because the fiber is less able to rotate freely in the post-drafting zone, and it is difficult for the coarse yarn to untwist in the post-drafting zone, resulting in a significant increase in the number of +50% thick sections and -50% thin sections.

[0074] Comparative Example 4

[0075] A bidirectional rubber ring super-large draft spinning method is basically the same as that of Example 1B, with the only difference being that the arc length of the surface of the middle roller between the first middle roller jaws and the second middle roller jaws is 6 mm greater than L.

[0076] The yarn count finally spun was 40 Ne, the CV value of the yarn evenness was 6.4%, the number of +50% thick sections was 1.6 pieces / km, and the number of -50% thin sections was 1.4 pieces / km.

[0077] Compared with Example 1 B, the changes in the number of +50% thick sections and -50% thin sections of Example 4 are not obvious, and the CV value of the strip is increased by 113%. This is because the length of the free zone of the fiber sliver in the middle stretching zone is increased, the concentration of the fiber speed change point is reduced, and the CV value of the strip caused by stretching is increased. However, since the middle stretching zone is still affected by the friction force boundary of the lower rubber ring, the fiber sliver is less accidentally stretched, and the changes in the number of +50% thick sections and -50% thin sections are not obvious.

[0078] Example 2A

[0079] A bidirectional rubber ring super-large drafting device, such as Figure 2 As shown, it is composed of a rear upper rubber ring 7, a front upper rubber ring 14, a lower rubber ring 25, a tensioner 30, a rear rubber roller 21, a rear upper pin 26, a middle first rubber roller 22, a middle second rubber roller 23, a front upper pin 27, a front rubber roller 24 arranged at intervals along the running direction of the fiber whiskers, and a rear roller 1, a rear lower pin 28, a middle roller 20, a front lower pin 29, and a front roller 17 arranged at intervals along the running direction of the fiber whiskers;

[0080] The rear rubber roller 21 and the rear roller 1 are arranged up and down and the two form a rear roller jaw, the rear upper pin 26 and the rear lower pin 28 are arranged up and down, the front upper pin 27 and the front lower pin 29 are arranged up and down, and the front rubber roller 24 and the front roller 17 are arranged up and down and the two form a front roller jaw;

[0081] The rear upper rubber ring 7 is simultaneously sleeved on the rear upper pin 26 and the middle first rubber roller 22, the front upper rubber ring 14 is simultaneously sleeved on the middle second rubber roller 23 and the front upper pin 27, and the tensioner 30 is located below the middle roller 20;

[0082] The number of the middle roller 20, the lower rubber ring 25, and the tensioner 30 is one;

[0083] The middle roller 20 is located below the first middle rubber roller 22 and the second middle rubber roller 23, and is tangent to the first middle rubber roller 22 and the second middle rubber roller 23 at the same time. The middle roller 20 and the first middle rubber roller 22 form a first middle roller jaw, and the middle roller 20 and the second middle rubber roller 23 form a second middle roller jaw. The rear drafting area is between the rear roller jaw and the first middle roller jaw, the middle drafting area is between the first middle roller jaw and the second middle roller jaw, and the front drafting area is between the second middle roller jaw and the front roller jaw.

[0084] The lower rubber ring 25 is simultaneously mounted on the rear lower pin 28, the middle roller 20, the front lower pin 29 and the tensioner 30;

[0085] The rear upper rubber ring 7 and the lower rubber ring 25 form a rear rubber ring jaw at the rear ends of the rear upper pin 26 and the rear lower pin 28;

[0086] The diameter of the rear roller 1 is 28 mm, the diameter of the middle roller 20 is 60 mm, and the diameter of the front roller 17 is the same as the diameter of the rear roller 1.

[0087] Example 2B

[0088] A bidirectional rubber ring super-large draft spinning method, the specific steps are as follows:

[0089] (1) Prepare raw materials;

[0090] Raw materials: twisted fiber whiskers, the fiber mass length of the twisted fiber whiskers is recorded as L, L is 32mm, the basis weight of the twisted fiber whiskers is 25g / 10m, and the twist of the twisted fiber whiskers is 70 twists / m;

[0091] (2) using a bidirectional rubber ring super-large drafting device provided in Example 2A to spin yarn;

[0092] The distance between the rear roller jaws and the rear rubber ring jaws is 8mm smaller than L;

[0093] The arc length of the surface of the middle roller 20 between the first middle roller jaw and the second middle roller jaw is 2 mm greater than L;

[0094] The drafting multiple of the rear drafting zone is 2.5 times, the drafting multiple of the middle drafting zone is 1 times, the drafting multiple of the front drafting zone is 120 times, and the total drafting multiple of the entire drafting zone is 300 times;

[0095] The pressure between the rear roller 1 and the rear rubber roller 21 is 115N, the pressure between the middle roller 20 and the middle first rubber roller 22 is 140N, the pressure between the middle roller 20 and the middle second rubber roller 23 is 140N, and the pressure between the front roller 17 and the front rubber roller 24 is 115N.

[0096] The yarn count finally spun was 63 Ne, the CV value of the yarn evenness was 5%, the number of +50% thick places was 3 / km, and the number of -50% thin places was 3 / km.

[0097] Example 3A

[0098] A bidirectional rubber ring super-large drafting device, such as Figure 2 As shown, it is composed of a rear upper rubber ring 7, a front upper rubber ring 14, a lower rubber ring 25, a tensioner 30, a rear rubber roller 21, a rear upper pin 26, a middle first rubber roller 22, a middle second rubber roller 23, a front upper pin 27, a front rubber roller 24 arranged at intervals along the running direction of the fiber whiskers, and a rear roller 1, a rear lower pin 28, a middle roller 20, a front lower pin 29, and a front roller 17 arranged at intervals along the running direction of the fiber whiskers;

[0099] The rear rubber roller 21 and the rear roller 1 are arranged up and down and the two form a rear roller jaw, the rear upper pin 26 and the rear lower pin 28 are arranged up and down, the front upper pin 27 and the front lower pin 29 are arranged up and down, and the front rubber roller 24 and the front roller 17 are arranged up and down and the two form a front roller jaw;

[0100] The rear upper rubber ring 7 is simultaneously sleeved on the rear upper pin 26 and the middle first rubber roller 22, the front upper rubber ring 14 is simultaneously sleeved on the middle second rubber roller 23 and the front upper pin 27, and the tensioner 30 is located below the middle roller 20;

[0101] The number of the middle roller 20, the lower rubber ring 25, and the tensioner 30 is one;

[0102] The middle roller 20 is located below the first middle rubber roller 22 and the second middle rubber roller 23, and is tangent to the first middle rubber roller 22 and the second middle rubber roller 23 at the same time. The middle roller 20 and the first middle rubber roller 22 form a first middle roller jaw, and the middle roller 20 and the second middle rubber roller 23 form a second middle roller jaw. The rear drafting area is between the rear roller jaw and the first middle roller jaw, the middle drafting area is between the first middle roller jaw and the second middle roller jaw, and the front drafting area is between the second middle roller jaw and the front roller jaw.

[0103] The lower rubber ring 25 is simultaneously mounted on the rear lower pin 28, the middle roller 20, the front lower pin 29 and the tensioner 30;

[0104] The rear upper rubber ring 7 and the lower rubber ring 25 form a rear rubber ring jaw at the rear ends of the rear upper pin 26 and the rear lower pin 28;

[0105] The diameter of the rear roller 1 is 33 mm, the diameter of the middle roller 20 is 65 mm, and the diameter of the front roller 17 is the same as the diameter of the rear roller 1.

[0106] Example 3B

[0107] A bidirectional rubber ring super-large draft spinning method, the specific steps are as follows:

[0108] (1) Prepare raw materials;

[0109] Raw materials: twisted fiber whiskers, the fiber mass length of the twisted fiber whiskers is recorded as L, L is 55mm, the basis weight of the twisted fiber whiskers is 23.5g / 10m, and the twist of the twisted fiber whiskers is 50 twists / m;

[0110] (2) using a bidirectional rubber ring super-large drafting device provided in Example 3A to spin yarn;

[0111] The distance between the rear roller jaws and the rear rubber ring jaws is 10 mm smaller than L;

[0112] The arc length of the surface of the middle roller 20 between the first middle roller jaw and the second middle roller jaw is 3 mm greater than L;

[0113] The drafting multiple of the rear drafting zone is 4 times, the drafting multiple of the middle drafting zone is 1 times, the drafting multiple of the front drafting zone is 60 times, and the total drafting multiple of the entire drafting zone is 240 times;

[0114] The pressure between the rear roller 1 and the rear rubber roller 21 is 120N, the pressure between the middle roller 20 and the middle first rubber roller 22 is 150N, the pressure between the middle roller 20 and the middle second rubber roller 23 is 150N, and the pressure between the front roller 17 and the front rubber roller 24 is 120N.

[0115] The yarn count finally spun was 80 Ne, the CV value of the yarn evenness was 4.8%, the number of +50% thick sections was 2.5 / km, and the number of -50% thin sections was 1.9 / km.

[0116] Example 4A

[0117] A bidirectional rubber ring super-large drafting device, such as Figure 2 As shown, it is composed of a rear upper rubber ring 7, a front upper rubber ring 14, a lower rubber ring 25, a tensioner 30, a rear rubber roller 21, a rear upper pin 26, a middle first rubber roller 22, a middle second rubber roller 23, a front upper pin 27, a front rubber roller 24 arranged at intervals along the running direction of the fiber whiskers, and a rear roller 1, a rear lower pin 28, a middle roller 20, a front lower pin 29, and a front roller 17 arranged at intervals along the running direction of the fiber whiskers;

[0118] The rear rubber roller 21 and the rear roller 1 are arranged up and down and the two form a rear roller jaw, the rear upper pin 26 and the rear lower pin 28 are arranged up and down, the front upper pin 27 and the front lower pin 29 are arranged up and down, and the front rubber roller 24 and the front roller 17 are arranged up and down and the two form a front roller jaw;

[0119] The rear upper rubber ring 7 is simultaneously sleeved on the rear upper pin 26 and the middle first rubber roller 22, the front upper rubber ring 14 is simultaneously sleeved on the middle second rubber roller 23 and the front upper pin 27, and the tensioner 30 is located below the middle roller 20;

[0120] The number of the middle roller 20, the lower rubber ring 25, and the tensioner 30 is one;

[0121] The middle roller 20 is located below the first middle rubber roller 22 and the second middle rubber roller 23, and is tangent to the first middle rubber roller 22 and the second middle rubber roller 23 at the same time. The middle roller 20 and the first middle rubber roller 22 form a first middle roller jaw, and the middle roller 20 and the second middle rubber roller 23 form a second middle roller jaw. The rear drafting area is between the rear roller jaw and the first middle roller jaw, the middle drafting area is between the first middle roller jaw and the second middle roller jaw, and the front drafting area is between the second middle roller jaw and the front roller jaw.

[0122] The lower rubber ring 25 is simultaneously mounted on the rear lower pin 28, the middle roller 20, the front lower pin 29 and the tensioner 30;

[0123] The rear upper rubber ring 7 and the lower rubber ring 25 form a rear rubber ring jaw at the rear ends of the rear upper pin 26 and the rear lower pin 28;

[0124] The diameter of the rear roller 1 is 28 mm, the diameter of the middle roller 20 is 60 mm, and the diameter of the front roller 17 is the same as the diameter of the rear roller 1.

[0125] Example 4B

[0126] A bidirectional rubber ring super-large draft spinning method, the specific steps are as follows:

[0127] (1) Prepare raw materials;

[0128] Raw materials: twisted fiber whiskers, the fiber mass length of the twisted fiber whiskers is recorded as L, L is 45mm, the basis weight of the twisted fiber whiskers is 20g / 10m, and the twist of the twisted fiber whiskers is 60 twists / m;

[0129] (2) using a bidirectional rubber ring super-large drafting device provided in Example 4A to spin yarn;

[0130] The distance between the rear roller jaws and the rear rubber ring jaws is 6mm smaller than L;

[0131] The arc length of the surface of the middle roller 20 between the first middle roller jaw and the second middle roller jaw is 3 mm greater than L;

[0132] The drafting multiple of the rear drafting zone is 3 times, the drafting multiple of the middle drafting zone is 1 times, the drafting multiple of the front drafting zone is 70 times, and the total drafting multiple of the entire drafting zone is 210 times;

[0133] The pressure between the rear roller 1 and the rear rubber roller 21 is 110N, the pressure between the middle roller 20 and the middle first rubber roller 22 is 135N, the pressure between the middle roller 20 and the middle second rubber roller 23 is 135N, and the pressure between the front roller 17 and the front rubber roller 24 is 110N.

[0134] The yarn count finally spun was 62 Ne, the CV value of the yarn evenness was 3.6%, the number of +50% thick sections was 1.5 / km, and the number of -50% thin sections was 1.8 / km.

Claims

1. A bidirectional rubber ring super-large drafting device, comprising a rear rubber roller (21), a rear upper pin (26), a middle first rubber roller (22), a middle second rubber roller (23), a front upper pin (27), and a front rubber roller (24) arranged at intervals along the running direction of the fiber strands; It also includes a rear roller (1), a rear lower pin (28), a middle roller (20), a front lower pin (29), and a front roller (17) arranged at intervals in the running direction of the fiber strands; The rear rubber roller (21) and the rear roller (1) are arranged vertically and the two form a rear roller jaw, the rear upper pin (26) and the rear lower pin (28) are arranged vertically, the front upper pin (27) and the front lower pin (29) are arranged vertically, and the front rubber roller (24) and the front roller (17) are arranged vertically and the two form a front roller jaw; It also includes a rear upper rubber ring (7), a front upper rubber ring (14), a lower rubber ring (25), and a tensioner (30); The rear upper rubber ring (7) is simultaneously mounted on the rear upper pin (26) and the first middle rubber roller (22), the front upper rubber ring (14) is simultaneously mounted on the second middle rubber roller (23) and the front upper pin (27), and the tensioner (30) is located below the middle roller (20); It is characterized in that The number of the middle roller (20), the lower rubber ring (25), and the tensioner (30) is one; The middle roller (20) is located below the first middle rubber roller (22) and the second middle rubber roller (23), and is tangent to the first middle rubber roller (22) and the second middle rubber roller (23). The middle roller (20) and the first middle rubber roller (22) form a first middle roller jaw, and the middle roller (20) and the second middle rubber roller (23) form a second middle roller jaw. A rear drafting zone is formed between the rear roller jaw and the first middle roller jaw, a middle drafting zone is formed between the first middle roller jaw and the second middle roller jaw, and a front drafting zone is formed between the second middle roller jaw and the front roller jaw. The lower rubber ring (25) is simultaneously mounted on the rear lower pin (28), the middle roller (20), the front lower pin (29) and the tensioner (30); The rear upper rubber ring (7) and the lower rubber ring (25) form a rear rubber ring jaw at the rear ends of the rear upper pin (26) and the rear lower pin (28).

2. A bidirectional rubber ring super-large drafting device according to claim 1, characterized in that: The diameter of the rear roller (1) is 25-33 mm, the diameter of the middle roller (20) is 55-65 mm, and the diameter of the front roller (17) is the same as the diameter of the rear roller (1).

3. A bidirectional rubber ring super-large draft spinning method, characterized in that: A bidirectional rubber ring super-large drafting device as claimed in claim 1 or 2 is used, and the raw material is twisted fiber strands; The mass length of the twisted fiber strand is recorded as L ; The distance between the rear roller jaws and the rear rubber ring jaws L 5-10mm smaller.

4. A bidirectional rubber ring super-large draft spinning method according to claim 3, characterized in that: The arc length ratio of the surface of the middle roller (20) between the first middle roller jaw and the second middle roller jaw is L 2-3mm larger.

5. A bidirectional rubber ring super-large draft spinning method according to claim 3, characterized in that: The basis weight of the twisted fiber strands is 20-30 g / 10 m.

6. A bidirectional rubber ring super-large draft spinning method according to claim 3, characterized in that: The twist of the twisted fiber strands is 50-70 twists / m, the drafting multiple of the rear drafting zone is 2-4 times, the drafting multiple of the front drafting zone is 60-120 times, and the total drafting multiple of the entire drafting zone is 200-300 times.

7. A bidirectional rubber ring super-large draft spinning method according to claim 6, characterized in that: The drafting ratio in the middle drafting zone is 1.

8. The bidirectional rubber ring super-large draft spinning method according to claim 3, characterized in that: The pressure between the rear roller (1) and the rear rubber roller (21) is 100-120N, the pressure between the middle roller (20) and the first middle rubber roller (22) is 130-150N, the pressure between the middle roller (20) and the second middle rubber roller (23) is 130-150N, and the pressure between the front roller (17) and the front rubber roller (24) is 110-120N.

9. A bidirectional rubber ring super-large draft spinning method according to any one of claims 3 to 8, characterized in that: The yarn count obtained by spinning is 40-80 Ne, the CV value of the yarn evenness is 3-5%, the number of +50% thick sections is 1-3 pieces / km, and the number of -50% thin sections is 1-3 pieces / km.

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