CN108977946B

CN108977946B - Uniform drafting method for large drafting of rear area of spinning frame

Info

Publication number: CN108977946B
Application number: CN201811036320.7A
Authority: CN
Inventors: 徐卫林; 夏治刚; 郭维琪; 刘可帅
Original assignee: Wuhan Textile University
Current assignee: Wuhan Textile University
Priority date: 2018-09-06
Filing date: 2018-09-06
Publication date: 2021-04-13
Anticipated expiration: 2038-09-06
Also published as: CN108977946A

Abstract

The invention relates to a uniform drafting method for large drafting in the rear area of a spinning frame, and belongs to the technical field of textile processing. In the invention, a drafting uniform device is added in the rear drafting area of the spinning frame. The drafting uniform device is composed of a pair of pressure holders. The pressure holders are composed of a sheave, a support shaft and a bearing. Left-handed and right-handed threads are respectively set on the upper part to ensure that the traversing roving smoothly enters the triangular groove in the middle of the sheave. It penetrates the roving sliver, prevents the roving sliver twist transmission, increases the roving sliver twist between the rear roller jaw and the drafting uniform device, and suppresses the early speed change of the fibers of the roving sliver with large draft in the rear area, which causes uneven drafting. The twist and drafting force of the roving sliver after the even-stretching device are reduced, which promotes the concentrated speed change of the fibers, improves the drafting uniformity, and realizes the uniform drafting of the large draft in the rear area of the spinning frame. The invention has obvious effect, simple operation, and is favorable for popularization.

Description

Uniform drafting method for large drafting of rear area of spinning frame

Technical Field

The invention relates to a uniform drafting method for large drafting of a rear area of a spinning machine, which is particularly suitable for a high-power large drafting process of spun yarns and belongs to the technical field of textile processing.

Technical Field

The spun yarn high draft is an important link for reducing the spinning cost and realizing spinning intellectualization, is an important process which needs to be broken through in the spinning process, and a lot of research on the aspect is carried out at home and abroad for many years. The high draft of the spun yarn is mainly realized by increasing the draft zone or the front zone, and usually, the number of the draft zones or the draft multiple of the front zone is increased, but the draft multiple of the rear zone cannot be greatly increased. At present, the drafting multiple of the back drafting zone is generally controlled within 1.5 times at home, because the back zone drafting is too large, the roving twist is transmitted to the front drafting zone along the fiber direction, the fiber in the front drafting zone can not be completely drafted, and the technical problem of yarn evenness deterioration is caused. Aiming at the problem, solutions are proposed at home and abroad, such as increasing the center distance, trying to change the roving twist and the like, and finally the control on the floating fibers cannot be solved all the time, so that the effect is not ideal. In recent years, the two-apron and four-roller solutions have not been widely popularized due to their operation, cost, and stability. The recent pressure bar, the thread pressure bar, can not solve the problem of evenness deterioration.

Chinese patent No. 6/16/2010, "a draft back zone control assembly of a spinning machine," patent publication No. CN 101736456A; the invention patent of 'pressure bar pin-up' applied in 4/8/2005, patent application number CN200510063419.2, adopts a polished rod type pressure bar added in the back draft zone to solve the control of floating fiber, thereby solving the problem of yarn evenness deterioration under the conventional back zone draft multiple (within 1.5 times) to a certain extent. In practice, the polished rod pressure bar does improve the evenness, and when the draft ratio in the back zone exceeds two times, the polished rod pressure bar is exposed to the problem that the polished rod pressure bar can control floating fibers and prevent twist conduction, but the polished rod pressure bar cannot release the twist sufficiently, so that the front zone draft cannot be performed sufficiently, and the evenness is deteriorated.

Chinese patent "pressure bar with thread-like spinning wheel for back draft zone of spun yarn" published 26.2015, 08.26.a patent publication No. CN104862832A proposes that the twist is uniformly released while holding the fiber strand by the rotary screw thread addition, thereby overcoming the defect of the pressure bar of polished rod. But the rotatory pressure bar of screw thread is in the use, because the screw thread has produced a horizontal effort to roving fibre, not only impels roving except to move forward, leads to roving transverse motion and skew moreover, has appeared the phenomenon that the roving concentrates on one side of screw thread, and finally can't evenly overturn the twist, is unfavorable for the prozone draft. Therefore, the large draft of the dry sliver still deteriorates, and the uniform and stable large draft process cannot be realized by increasing the draft multiple of the rear zone.

Disclosure of Invention

In view of the existing problems, the invention aims to provide a uniform drafting method for large drafting of a rear area of a spinning frame, and the technical scheme is as follows:

a back-zone large-draft uniform drafting method of a spinning frame comprises a back roller jaw formed by meshing a back roller and a back rubber roll of the spinning frame, a middle lower apron sleeved on a middle lower roller and a middle upper apron sleeved on a middle upper roller are meshed to form a apron jaw, a back drafting zone of the spinning frame is formed between a back roller jaw line and a apron jaw line, a drafting uniform device is additionally arranged in the back drafting zone of the spinning frame and consists of a pair of pressing devices, each pressing device consists of a grooved wheel, a support shaft and a bearing, left-handed threads and right-handed threads are respectively arranged on the outer surfaces of the left side and the right side of the grooved wheel, a group of triangular grooves are formed in the middle of the grooved wheel in the circumferential direction and are perpendicular to the central axis of the grooved wheel, the grooved wheels are symmetrically arranged at the two ends of the support shaft through the bearing, the pair of pressing devices are arranged in a front-back manner, The back roller jaws are positioned on two sides of the plane;

during spinning, roving unwound from a roving package enters a rear roller jaw through a bell mouth, the roving output from the rear roller jaw enters a 2.0-4.5 times rear drafting area of a spinning machine, is subjected to S-shaped contact extrusion of a pair of pressing devices of a drafting uniform device, triangular grooves on grooved wheels of the pressing devices penetrate into roving strips, the roving strip twist between the rear roller jaw and the drafting uniform device is prevented from being transmitted forwards, the roving strip twist between the rear roller jaw and the drafting uniform device is increased, the fiber advance speed change of the roving strips subjected to the large drafting in the rear area of the spinning machine is inhibited, the roving strip twist reduced after the S-shaped contact extrusion, the cohesion force among the fibers is reduced, the roving strips subjected to the reduction of the twist and the cohesion force are arranged between the drafting uniform device and a apron jaw, the drafting force required by the large drafting of the roving strips is reduced, the fiber concentration speed change in the roving strips is promoted, and the drafting uniformity is improved, the roving sliver after the uniform drafting of the large drafting in the back drafting zone of the spinning machine enters a leather collar jaw along the direction tangent to the leather collar jaw, the roving sliver is fed into the front drafting zone of the spinning machine from the leather collar jaw to carry out conventional high-power drafting, finally, the spun yarn drafting multiple of the roving is increased, the fiber sliver after the large drafting is output by a front roller jaw formed by meshing a front roller and a front rubber roller to twist yarn, and the yarn is wound on a bobbin package through a yarn guide hook, a steel collar and a steel wire loop in sequence.

The outer diameter of the grooved pulley is 4mm-8mm, and the inner diameter of the grooved pulley is 2mm-3 mm.

The length of the group of triangular grooves on the grooved wheel is 10mm-20 mm.

The section of the triangular groove is in an isosceles triangle shape, the angle of the bottom of the triangular groove is 30-60 degrees, the width of the opening of the triangular groove is 0.3-1 mm, the depth of the groove is 0.3-1 mm, and the top and the bottom of the triangular groove are circular arcs with chamfer angles of 0.1-0.15 mm.

Due to the adoption of the technical scheme, compared with the prior art, the uniform drafting method for the large drafting of the rear area of the spinning frame has the advantages that: the invention adopts the technical scheme that a drafting uniform device is additionally arranged in the rear drafting zone of a spinning machine, the drafting uniform device consists of a pair of pressing and holding devices, each pressing and holding device consists of a grooved pulley, a supporting shaft and a bearing, and left-handed and right-handed threads are respectively arranged on the outer surfaces of the left side and the right side of the grooved pulley, so that roving smoothly enters a triangular groove in the middle of the grooved pulley when traversing, thereby overcoming the technical problem that the spinning pressure rod of the thread generates transverse force to gather and offset slivers, which causes great deterioration of evenness under the condition of 2.0-4.5 times of large drafting in the rear zone of the spinning machine; a group of triangular grooves are arranged in the middle of a grooved wheel of a pressing and holding device along the circumferential direction, a pair of pressing and holding devices are arranged front and back and are arranged in parallel and symmetrically, the pressing and holding devices arranged front and back are respectively positioned at two sides of a plane where a front opening of a leather collar and a back roller jaw are positioned, a roving strip is extruded through S-shaped contact of the pair of pressing and holding devices when drafting in a back area, the triangular grooves on the grooved wheel of the pressing and holding device penetrate into the roving strip, the roving strip twist between the back roller jaw and a drafting uniform device is prevented from being transmitted forward, the roving strip twist between the back roller jaw and the drafting uniform device is increased, the fiber of the roving strip greatly drafted in the back area of a spinning frame is prevented, therefore, the technical problems that under the condition of high-power back zone drafting, the polished rod can not fully block twist transmission, so that the twist release of the pressed and held sliver can not be realized, and the control and uniform drafting of the sliver fiber can not be improved are solved. The twist of the roving strips after the S-shaped contact extrusion is reduced, the cohesive force between fibers is reduced, and the roving strips with the reduced twist and cohesive force are arranged between the drafting uniform device and the apron jaw, so that the drafting force required by the large drafting of the roving strips is reduced, the concentrated speed change of the fibers in the roving strips is promoted, the drafting uniformity is improved, and the application and production of the uniform and stable large drafting process are realized by improving the drafting multiple of the back area. The invention has obvious effect and simple operation, and is beneficial to large-area popularization and use.

Drawings

Fig. 1 is a schematic diagram of the working principle of the present invention.

Fig. 2 is a schematic structural view of the clamper.

Detailed Description

The present invention is described in further detail below with reference to fig. 1 and 2.

See the attached drawings.

A uniform drafting method of the spinning frame rear zone large draft, to the polished rod can't fully release the twist, the thread rotates the pressure bar to produce the transverse force and gather and deflect the sliver, the spinning frame rear zone is in the 2.0-4.5 times large draft condition the yarn evenness worsens greatly, cause the spinning frame can't implement the large draft craft technical question evenly and stably, the invention adopts and adds the drafting uniform device in the spinning frame rear draft zone, the drafting uniform device is made up of a pair of holder, the holder is made up of sheave 6, back shaft 7 and bearing 8, set up the left-handed thread, right-handed thread on the left and right both sides external surface of the sheave 6 respectively, the middle part of the sheave 6 has a set of triangular groove along the circumferencial direction, the length that a set of triangular groove takes up on the sheave 6 is 10mm-20mm, the thicker the roving strand is, the greater the transverse amplitude is when drafting, the set of triangular groove takes up the longer length on, the triangular groove is vertical to the central axis of the grooved pulley 6, the section of the triangular groove is in an isosceles triangle shape, the angle of the bottom of the triangular groove is 30-60 degrees, the smaller the angle of the bottom of the triangular groove is, the larger the contact extrusion force on the roving strand is, the width of the notch of the triangular groove is 0.3-1 mm, the depth of the notch is 0.3-1 mm, the smaller the width of the notch is, the larger the depth of the notch is, the larger the contact extrusion force on the roving strand is, and the top and the bottom of the triangular groove are both in circular arcs with chamfer angles of 0.1-0.15; the grooved pulleys 6 are symmetrically arranged at two ends of the supporting shaft 7 through bearings 8, the grooved pulleys 6 can run in a rotating mode at the moment, the grooved pulleys 6 can also be arranged at two ends of the supporting shaft 7 in a straight fixed mode, the grooved pulleys 6 can only work in a fixed mode at the moment, the outer diameter of each grooved pulley 6 is 4-8 mm, the inner diameter of each grooved pulley 6 is 2-3 mm, the thicker the roving strand is during drafting, the larger the outer diameter of each grooved pulley 6 is, the smaller the inner diameter of each grooved pulley 6 is, the deeper triangular grooves are convenient to arrange, more effective contact type extrusion is carried out on the roving, the pair of pressing holders are arranged in a front-back mode and are arranged in a parallel and symmetrical mode, and the pressing holders arranged in the front-back;

during spinning, roving unwound from a roving package enters a rear roller jaw formed by meshing a rear roller 3 and a rear rubber roller 2 of a spinning machine through a bell mouth 1, a middle lower leather collar 9 sleeved on a middle lower roller 10 is meshed with an upper middle leather collar 4 sleeved on an upper middle roller 5 to form a leather collar jaw, a rear drafting zone of the spinning machine is formed between the rear roller jaw line and the leather collar jaw line, the roving output from the rear roller jaw enters a 2.0-4.5 times rear drafting zone of the spinning machine, the roving is subjected to S-shaped contact extrusion of a pair of pressing devices of a drafting uniform device, a triangular groove on a grooved pulley 6 of the pressing device penetrates into roving, the roving twist between the rear roller jaw and the drafting uniform device is prevented from being transmitted forwards, the roving twist between the rear roller jaw and the drafting uniform device is increased, the fiber of the roving in the rear zone of the spinning machine is prevented from being changed in advance, the roving twist after the S-shaped contact extrusion is reduced, and the roving twist of the roving is, The thick sliver with reduced twist and cohesive force is between the drafting homogenizing device and the apron jaw, so that the drafting force required by the thick sliver drafting is reduced, the concentrated speed change of the fiber in the thick sliver is promoted, the drafting uniformity is improved, the thick sliver drafted uniformly in the drafting zone behind the spinning machine enters the apron jaw in the direction tangent to the apron jaw, the thick sliver is fed into the drafting zone in the front zone of the spinning machine from the apron jaw to be subjected to conventional high-power drafting, the spun yarn drafting multiple of the thick sliver is increased finally, the fiber sliver drafted greatly is output by the front roller jaw formed by the engagement of the front roller and the front rubber roller, the twisted yarn is formed, and the yarn sequentially passes through the yarn guide hook, the steel collar and the steel wire loop and is wound on the package bobbin. By adopting the method, the 800tex pure cotton roving is spun into 18.3tex cotton yarn by a 3.0-time spinning machine rear area large draft spinning process, the inner diameter of a grooved pulley 6 is 2.5mm, the outer diameter is 7 mm, the width of a notch is 0.6mm, the depth of the groove is 1mm, roving strips pass through a pair of pressing and holding devices which are arranged in front and back and are symmetrically arranged in parallel by a next upper type (see figure 1) S-shaped path, and finally the evenness CVm% of the spun yarn is 13.50; the yarn evenness unevenness rate CVm of the yarn drawn by the back zone drafting of the non-pressure bar and the smooth pressure bar is respectively 19.59 percent and 16.13 percent, and the yarn evenness unevenness rate CVm is higher. Therefore, the invention obviously improves the evenness of the high draft yarn in the rear area of the spinning frame.

Claims

1. The utility model provides a spinning frame back zone high draft's even draft method, includes that back roller (3) and back rubber roll (2) meshing of spinning frame form the back roller keep silent, and well lower apron (9) of suit on well lower roller (10) and well upper leather collar (4) of suit on well upper roller (5) mesh and form the apron and keep silent, form the spinning frame back draft zone between back roller keeps silent line and the apron keep silent line, its characterized in that: a drafting uniform device is additionally arranged in a back drafting zone of a spinning machine and consists of a pair of pressing devices, each pressing device consists of a grooved pulley (6), a support shaft (7) and a bearing (8), left-handed and right-handed threads are respectively arranged on the outer surfaces of the left side and the right side of the grooved pulley (6), a group of triangular grooves are arranged in the middle of the grooved pulley (6) along the circumferential direction and are perpendicular to the central axis of the grooved pulley (6), the grooved pulleys (6) are symmetrically arranged at the two ends of the support shaft (7) through the bearings (8), the pair of pressing devices are arranged in a front-back manner and are symmetrically arranged in parallel, and the pressing devices arranged in the front-back manner are respectively positioned at the two sides of a plane where a leather collar;

during spinning, roving unwound from a roving package enters a rear roller jaw through a bell mouth (1), the roving output from the rear roller jaw enters a 2.0-4.5 times rear drafting area of a spinning machine, is subjected to S-shaped contact extrusion of a pair of pressing and holding devices of a drafting uniform device, a triangular groove on a grooved pulley (6) of the pressing and holding device penetrates into the roving, the roving twist between the rear roller jaw and the drafting uniform device is prevented from being transmitted forwards, the roving twist between the rear roller jaw and the drafting uniform device is increased, the fiber advance speed change of the roving in the large drafting area of the spinning machine is inhibited, the roving twist after the S-shaped contact extrusion is reduced, the cohesion force between fibers is reduced, the roving with the reduced twist and the cohesion force are arranged between the uniform drafting device and a apron jaw, the drafting force required by the large drafting of the roving is reduced, and the concentrated speed change of the fibers in the roving is promoted, the drafting uniformity is improved, the roving strips which are greatly drafted in the rear drafting zone of the spinning machine and are uniformly drafted enter the leather collar jaw along the direction tangent to the leather collar jaw, the roving strips are fed into the front drafting zone of the spinning machine from the leather collar jaw to be subjected to conventional high-power drafting, the spun yarn drafting multiple of the roving is finally increased, the fiber strands which are greatly drafted are output by the front roller jaw formed by the engagement of the front roller and the front rubber roller to be twisted to form yarns, and the yarns are wound on a bobbin package sequentially through a yarn guide hook, a steel collar and a steel wire loop.

2. The uniform drafting method of the spinning frame back zone large drafting according to claim 1, characterized in that: the outer diameter of the grooved pulley (6) is 4mm-8mm, and the inner diameter of the grooved pulley (6) is 2mm-3 mm.

3. The uniform drafting method of the spinning frame back zone large drafting according to claim 1, characterized in that: the length of the group of triangular grooves on the grooved pulley (6) is 10mm-20 mm.

4. The uniform drafting method of the spinning frame back zone large drafting according to claim 1, characterized in that: the section of the triangular groove is in an isosceles triangle shape, the angle of the bottom of the triangular groove is 30-60 degrees, the width of the opening of the triangular groove is 0.3-1 mm, the depth of the groove is 0.3-1 mm, and the top and the bottom of the triangular groove are circular arcs with chamfer angles of 0.1-0.15 mm.