Combined frictional false twisting device for ring spinning frame

Abstract

A frictional false twister is disclosed. The twister has a plurality of rotating friction plates located between the nip of the front rollers and the yarn guide. The friction plates are staggeringly arranged for rubbing a twisted yarn. The spinning direction of the twisted yarn is opposite to the rotating direction of the friction plates. Through the action of the frictional false twister, the twist of the yarn between the false twisting device to the front nip can be increased, shortening the twisting triangle height, and increasing the spinning strength. As the yarn and the outer surface of the friction plate make relative sliding and rubbing, the friction damping force correspondingly reduces the spinning tension in the twisting triangle.

Description

TECHNICAL FIELD

The present invention relates to the field of textile industry, specifically refers to a friction false twisting device for use in a ring spinning machine.

BACKGROUND OF INVENTION

Since 1830, the traditional ring spinning machine was invented, more than 180 years has passed and has become the world's largest, the most widely used spinning main equipment. Spinning production capacity of China's textile industry has been more than 50% of the global total, there are 120 million cotton spindles and about 4 million wool spindles.

Traditional ring spinning machine has a unique twist mechanism, and the special structure of yarn spinning, resulting in soft and fluffy yarn, cannot be replaced by any new spinning technology.

However, with the development of the modern textile industry, people pays more attention to the inherent defects of the ring spinning machine. The prolonged production practice shows that the key technical bottlenecks of the ring spinning machine are spinning end breakage and unevenness, the strength of the yarn which in twisting triangle area is less than the spinning tension leads to the spinning end breakage and unevenness. Therefore, reducing the spinning tension while increasing the strength of the yarn is the preferred target task of the spinning field researchers.

Spinning tension is the force that transmitted to the twisting triangle area by the sliver of the bottom of the ring spinning machine. The spinning tension is a composite force, and may change every moment.

Spinning tension is the algebraic sum of five variable forces: winding tension, the damping force of the bead ring, the centrifugal force of the air ring, ring board move additional dynamic tension and the yarn guide damping tension. The adverse consequences of excessive spinning tension acting on the twisting point are that the fibers in the yarn will slip to produce unexpected draft, making the yarn uneven and increasing snicks. Even the spinning end may break.

The spinning strength refers to the spinning strength in the twist triangle area. It has a large difference with yarn strength. The strength of yarn depends on the fiber tensile strength, fiber length, curl roughness surface and applying a twist level. With the increase of the twist, the holding force of the fibers in the yarn will increase, and the yarn strength will increase. Twist factor is not only a major factor but also a direct factor. Spinning strength determined by the following factors: fiber breaking strength, fiber length, roller grip force, twisting triangle width and height. Direct factor is the height of the twisting triangle, twisting triangle height determines the roller nip holding the amount of fiber. Twisting triangle height lower, there are more fibers can be controlled in the twisting triangle. Increasing twist and torque is the most effective measure to reduce the twisting triangle height. There is a great difference between increasing spinning strength by increasing twist and increasing yarn strength by increasing twist. Increasing the yarn twist can increase the holding force of fibers, but increasing the twist of the twisting triangle can only reduce the twisting triangle height, and increasing the fibers can be held by the roller. According to relevant information, the spinning strength is very low, for example, the spinning strength of 28tex cotton yarn is about 90˜150 cN, However the strength of yarn is about 400 cN. Therefore, increasing spinning strength can prevent decapitation and improve the sliver evenness. Increasing the twist in the twisting triangle is the most effective technical measures to improve the quality of yarn and prevent decapitation, but increasing the twist makes the fabric feel hardened.

Because of the above defects of the ring spinning machine, application of the ring spinning machine is limited. If the spinning speed, cannot be further increased and spindle speed remains about 15000 r/min, the traditional ring spinning machine cannot spun the yarn lower than 330 twists per meter, that requires greater spinning fiber length and short fiber content.

For the defects regarding high spinning tension and low spinning strength of ring spinning machine, people continue to study and explore ways to improve. The current improvements are as follows:

• • (1) Using ingot end the finger-shaped ingot spinning. Its technical advantage is the spinning tension significantly being improved and simple structure. The disadvantages are that the spinning strength did not increase but decrease, and the friction between the yarn and bobbin becomes severe causing more lint;
  • (2) Using the magnetic rotary yarn guide in place of the yarn guide. This can produce the false twist effect and the spinning twist can be transmitted to the front roller nip, and reduce the twisting triangle area. Spinning strength can be improved by about 20%, and spinning speed can also be improved by about 20%. The low-twist yarn can be spun. The disadvantages are that the splicing operation is inconvenient, the high manufacturing cost of the yarn guide, and the low efficiency of false-twist.
  • (3) Chinese patent No. 201010237244.3 discloses a high-strength, low-tension spinning device, equipped with yarn tension damping needle holding the false twist. The advantages of this device are lower spinning tension, and improved spinning strength. The disadvantage is that the splicing operation being inconvenient;
  • (4) Chinese patent No. 201110129873.9 discloses using a pair of the dust cage in the form of friction false twist to compact wet spinning. The advantages are increased spinning strength, reduced the spinning tension and more convenient splicing operation. The disadvantage is that the suction of the dust cage motor needs more power;
  • (5) Chinese patent No. 02118588.3 proposes a method and apparatus to reduce spinning tension, spun low twist yarn. The disadvantage is that the spinning strength cannot be improved. Using the provided fiber splitting mechanism, the amount of fiber held by roller decreases, the yarn evenness is deteriorated, snicks are increased, the efficiency of false-twist is low, and the splicing operation is inconvenient;
  • (6) U.S. Pat. No. 7,096,655 B2 is comparable with the Chinese patent application 02118588.3. Except for more convenient operation, it has the same defects and problems.

SUMMARY OF THE INVENTION

The object of the invention is to provide a modular friction false twist device, which can overcomes the above-described defects. It improves the ring spinning machine yarn twist distribution, improves spinning strength, and reduces spinning tension.

The present invention is implemented through the following technical measures: It uses a modular friction false twisting device in a ring spinning machine. The device is characterized in that: from the roller nip to the yarn guide in a ring spinning machine, along the direction of the length of the ring spinning machine, provides an installation with a rectangular cross section panel, which is fixed via a mounting foot by the machine panel of the ring spinning machine; To each spinning spindle there is installed a set of frictional false twister, and each set of frictional false twister is constituted by three groups of frictional coupling elements. Each group of frictional coupling member has a mandrel and a friction plate. The three mandrels are separately fixed by two bearings on the rectangular cross-section panel in left, center and right positions. Two or three friction plates are provided on the middle mandrel, and one or two friction plates is correspondingly provided on the left and right mandrels. The friction plates of the left and right mandrels are disposed on a same plane, while the friction plates of the middle mandrel are disposed against the friction plates of the right and left mandrels in a staggering but parallel fashion. The three mandrels are driven by a drive belt, which also drive the friction plates, thus achieving the false twist on the yarn by the cylindrical surface of the friction plates. The drive belt is driven by a motor on the machine panel in the front of the ring spinning machine.

The friction plate's thickness is 1˜2 mm, and the outer diameter is 18˜25 mm.

The outer peripheral surface of the friction plate is treated with reticulate knurling processing.

The present invention has the following technical advantages: it increases the yarn twist between the front roller nip and the false-twister, and subsequently reduces the twist of yarn between yarn guide and the false-twister, resulting in the reduction of the twisting triangle height. The amount of fiber held by the rollers increases and the yarn strength of spinning area improves. The yarn breakage also reduces, yarn evenness improves, and the spinning tension in the twisting triangular area, to some extent, is reduced by the damping measures in the frictional false twisting.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view on a cross section of a ring spinning machine, according to the present invention.

FIG. 2 is a front view of the ring spinning machine of the present invention.

FIG. 3 is a schematic diagram of the false-twisting process, according to the present invention.

FIG. 4 is a schematic diagram of the mounting of a frictional coupling member.

FIG. 5 shows the driving direction for spinning Z-twist yarns.

FIG. 6 shows the driving direction for spinning S-twist yarns.

FIG. 7 is a schematic diagram of the conventional ring spinning flame showing the yarn twist by the yarn guide.

FIG. 8 is a twist distribution in the yarn using the present invention.

In the drawings; 1—middle mandrel; 1′—middle mandrel friction plate; 2—right mandrel; 2′—right mandrel friction plate; 3—left mandrel; 3′—left mandrel friction plate; 4—transmission belt; 5—tension pulley; 6—low twist sliver; 7—rectangular cross-section panel; 8—mounting. feet; 9—drive motor; 10—high twist sliver; 11—bearing; 15—front roller; 16—front rubber roller; 17—yarn guide; 18—bead ring; 19—yarn pipe; 20—machine panel.

Among the items shown in the drawings, items No. 1 to No. 11 are part of the present invention, and items No. 15-No. 20 are part of the existing ring spinning frame.

DESCRIPTION OF THE EMBODIMENTS

As the yarn is outputted from the front nip of the front roller 15 and the front rubber roller 16 to the false twisting device, it is placed among the outer peripheral surfaces of the friction plates. The yarn is put through a yarn guide 17, and finally wound on a yarn pipe 19. When spinning Z-twist yarns, the yarn is rubbed by the middle mandrel friction plate 1′ and right mandrel friction plate 2′. The friction plates 1′ and 2′ are rotated in the same clockwise direction, while the yarn rotates in the counter-clockwise rotation. When spinning S-twist yarns, the yarn is rubbed by the middle mandrel friction 1′ and left mandrel friction plate 3′. The friction plates 1′ and 3′ are rotated in the same counterclockwise direction, while the yarn rotates in the clockwise rotation.

Through the action of the frictional false twister, the twist of the yarn between the false-twist device to the front nip can be increased, shortening the twisting triangle height, and increasing the spinning strength. As the yarn and the outer surface of the friction plate make relative sliding and rubbing, the friction damping force correspondingly reduces the spinning tension in the twisting triangle.

Compared with the traditional ring spinning machine, this invention can reduce the spinning tension by about 36% and, at the same time, improve the spinning strength by about 15%-25%, and improve the spinning speed by 20%-30%. It can spin lower twist yarn than the traditional ring spinning machine, reduce design twist factor, reduce spinning residual torsional moment, and ultimately change the torsion deformation of the fabric and the vertical skew. It improves the fabric surface flatness and dyeing properties, and improve the feel of the fabric.

This device according to the present invention does not change the original structure of the ring spinning machine, suitable for retrofitting of old machine. The retrofitting cycle is short and the cost is low, suitable for the every enterprises.

With the increase of the number of friction plates and the roughness of the outer peripheral surface of the friction plate increased, the effect of the false twist will be improved, such as friction plate 1′ can be increased to 4 plates, and each of the friction plate 2′ and friction plate 3′ can be correspondingly increased to 3.

Claims

1-3. (canceled)

4. A frictional false twisting device, comprising: a plurality of friction plates (1′, 2′, 3′), located between a roller nip (15/16) and a yarn guide (17) in a ring spinning machine, each friction plate comprising a peripheral outer surface, wherein the roller nip is arranged to output a yarn toward the yarn guide, the yarn is arranged to spin in a spinning direction; anda movement mechanism (9) arranged to rotate the friction plates in a rotating direction different from the spinning direction, wherein at least two of said plurality of friction plates (1′, 2′ or 1′, 3′) are located adjacent to each other but on different planes and rotated about different axes such that a segment of the yarn between the roller nip and the yarn guide is arranged to rub against the peripheral outer surfaces of said at least two friction plates.

5. The frictional false twisting device according to claim 4, further comprising a plurality of mandrels (1, 2, 3), each of the mandrel having a shaft for mounting a different one of said plurality of friction plate for rotation, wherein the movement mechanism comprises a driving belt (4) configured to rotate said plurality of mandrels in the rotating direction.

6. The frictional false twisting device according to claim 5, further comprising a support panel (7) arranged for mounting said plurality of mandrels between the roller nip and the yarn guide

7. The frictional false twisting device according to claim 6, wherein the support panel (7) having a first side and an opposing second side such that said plurality of mandrels are located on the first side and said plurality of frictional plates are located on the second side.

8. The frictional false twisting device according to claim 7, wherein the first side of the support panel (7) is facing the nip and the second side of the support panel (7) is facing the yarn guide.

9. The frictional false twisting device according to claim 6 wherein the ring spinning machine comprises a frame (20) and wherein the support panel (7) is fixedly mounted on the frame (20) via a mounting bracket (8).

10. The frictional false twisting device according to claim 4, wherein said at least two of said plurality of friction plates (1′, 2′) are arranged to rotate in a clockwise direction and the yarn is arranged to spin in a counter-clockwise direction.

11. The frictional false twisting device according to claim 4, wherein said at least two of said plurality of friction plates (1′, 3′) are arranged to rotate in a counter-clockwise direction and the yarn is arranged to spin in a clockwise direction.

12. The frictional false twisting device according to Jain 4, wherein the plurality of friction plates (1′, 2′, 3′) are arranged to rotate about a first rotating axis, a second rotating axis and a third rotating axis, and wherein said at least two friction plates comprises a first friction plate (1′) arranged to rotate about the first rotating axis, and a second friction plate (2′) arranged to rotate about a second rotating axis, said plurality of friction plates further comprising a third friction plate (3′) arranged to rotate in the first rotating direction about the third rotating axis such that the second and third friction plates are located on a first plane and the first friction plate is located on a different second plane adjacent to the first plane.

13. The frictional false twisting device according to 12, wherein each of the second and third friction plates (2′, 3′) has a diameter, and the second rotating axis and third rotating axis is separated by a distance greater the diameter, and wherein the first friction plate is arranged such that the peripheral outer surface of the first friction plate (1′) is tangential to a plane passing through the second and third rotating axes.

14. A method of frictional false twisting for use in a ring spinning machine, the ring spinning machine comprises a roller nip (15/16) for outputting a yarn toward a yarn guide (17), the yarn arranged to spin in a spinning direction; said method comprising: providing a plurality of friction plates (1′, 2′, 3′) between the roller nip (15/16) and the yarn guide (17), each friction plate comprising a peripheral outer surface, wherein at least two of said plurality of friction plates (1′, 2′ or 1′, 3′) are located adjacent to each other but on different planes and rotated about different axes;rotating the friction plates in a rotating direction different from the spinning direction; andcausing the yarn to rub against the peripheral outer surfaces of at least two of said plurality of friction plates (1′, 2′ or 1′, 3′).

15. The method according to claim 14, further comprising providing a plurality of mandrels (1, 2, 3), each of the mandrel having a shaft for mounting a different one of said plurality of friction plate for rotation; andarranging a moving driving belt (4) to spin the plurality of mandrels for said rotating.

16. The method according to claim 15, wherein the plurality of mandrels are mounted on a support panel (7) between the roller nip and the yarn guide, and wherein the support panel (7) having a first side and an opposing second side such that said plurality of mandrels are located on the first side facing the nip and said plurality of frictional plates are located on the second side facing the yarn guide.

17. The method according to claim 14, wherein said at least two of said plurality of friction plates (1′, 2′) are arranged to rotate in a clockwise direction and the yarn is arranged to spin in a counter-clockwise direction.

18. The method according to claim 14, wherein said at least two of said plurality of friction plates (1′, 3′) are arranged to rotate in a counter-clockwise direction and the yarn is arranged to spin in a clockwise direction.

19. The method according to claim 14, wherein the plurality of friction plates (1′, 2′, 3′) are arranged to rotate about a first rotating axis, a second rotating axis and a third rotating axis, and wherein said at least two friction plates comprises a first friction plate (1′) arranged to rotate about the first rotating axis, and a second friction plate (2′) arranged to rotate about a second rotating axis, said plurality of friction plates further comprising a third friction plate (3′) arranged to rotate in the rotating direction about the third rotating axis such that the second and third friction plates are located on a first plane and the first friction plate is located on a different second plane adjacent to the first plane.

20. The method according to 19, wherein each of the second and third friction plates (2′, 3′) has a diameter, and the second rotating axis and third rotating axis is separated by a distance greater the diameter, and wherein the first friction plate is arranged such that the peripheral outer surface of the first friction plate (1′) is tangential to a plane passing through the second and third rotating axes.