An asynchronous drafting device, a multi-channel digital rotor spinning machine and a ring spinning machine

Abstract

The present application relates to a kind of asynchronous drafting device, including N channel asynchronous feeding back roller and segmented pressure device;Segmented pressure device includes upper support, segmented pressure bar, 2N fixed spring, lower support, N segmented electromagnet, N controllable DC power supply and control system;Using control system to adjust output current, control the magnetic field of segmented electromagnet, produce attractive force to segmented pressure bar, make fixed spring deformation, segmented pressure bar close to segmented electromagnet, generate the holding force of preset pressure value.The present application sets segmented pressure device, changes the magnetic field size generated by segmented electromagnet by adjusting the output current of controllable DC power supply, and then changes the attractive force generated to segmented pressure bar, causes fixed spring deformation, changes the holding force generated;Different controllable DC power supply is used to realize the different needs of each channel to holding force, improve the stability and quality of hair strip drafting movement, and realize the shortening of multi-channel color mixing spinning process, improve production efficiency.

Description

Technical Field

[0001] This invention relates to the field of spinning technology in textile engineering, and in particular to an asynchronous drafting device, a multi-channel digital rotor spinning machine, and a ring spinning machine. Background Technology

[0002] Blended yarn is generally made by blending two or more fibers of different colors. Before spinning, the fiber raw materials must be dyed or solution-dyed. The resulting yarn exhibits a wide variety of colors and shortens subsequent processing steps, making it widely popular in the market. The main method for producing blended yarn on a spinning frame is to change the different colored slivers and their proportions. This method combines spinning and color matching, reduces the pre-spinning fiber mixing process, lowers production costs, and allows for flexible yarn blending ratio settings, resulting in a richer color palette.

[0003] While existing multi-channel digital rotor spinning technology improves the quality of blended yarns, limitations in the feeding and carding sections and related processes mean that traditional rotor spinning feed rates are typically set at 14g-20g / 5m, and the basis weight of a single sliver is generally 12g-25g / 5m. Therefore, it cannot meet the requirement of feeding multiple slivers simultaneously. To address this, existing multi-channel digital rotor spinning technology adds a roving process for blended yarn production. The basis weight of a single roving is typically 3g-5g / 10m, and feeding multiple rovings together meets the feed rate requirements, thus fulfilling the need for blended yarn production in rotor spinning.

[0004] Existing ring spinning machines for producing blended yarns employ an actuator consisting of multiple coaxial but independently driven back rollers, one middle roller, and one front roller. After two asynchronous drafting processes in both the back and front drafting zones, the yarn, in conjunction with the spindle and yarn guide, completes the twisting and winding of the blended yarn. The back drafting zone plays a dual role in controlling the blend ratio and pre-drafting; different channels have different drafting requirements, corresponding to varying holding forces. However, existing actuators rely solely on the deformation of the rollers themselves to provide holding force, resulting in insufficient holding force and instability in asynchronous drafting.

[0005] In summary, existing spinning machines rely solely on the deformation of the rollers themselves to provide gripping force when drafting fiber slivers. This results in insufficient gripping force and an inability to provide different gripping forces for different channels. Asynchronous drafting is unstable, leading to poor quality of the produced blended yarn. Existing multi-channel digital rotor spinning machines, due to limitations in the feeding and carding mechanisms and related processes, cannot simultaneously feed multiple slivers. Therefore, an additional roving process is required for blended yarn production, resulting in a complex production process and low efficiency. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the existing technology cannot effectively control the different gripping forces in different channels, resulting in unstable asynchronous drafting; and the problem that the existing multi-channel digital rotor spinning machine cannot feed multiple slivers at the same time.

[0007] To solve the above-mentioned technical problems, the present invention provides an asynchronous drafting device, including an N-channel asynchronous feed roller and a segmented pressure device, comprising: The upper support is arranged parallel to the axis of the N-channel asynchronous feed roller; N segmented pressure bars, the length of which corresponds to and matches the N rollers on the rollers after asynchronous feeding through N channels; 2N fixed springs, each fixed spring is connected to the segmented pressure bar at one end and to the upper bracket at the other end, and each segmented pressure bar is suspended on the upper bracket by 2 fixed springs; The lower support is arranged parallel to and directly below the upper support; N segmented electromagnets are respectively arranged directly below the N segmented pressure bars, and their length is the same as that of the segmented pressure bars, and they are embedded and fixed in the lower bracket; N controllable DC power supplies are respectively connected to the N segmented electromagnets; The control system is communicatively connected to the N controllable DC power supplies. It is used to preset the required gripping force pressure value for each channel of the N-channel asynchronous stretching device, and convert the gripping force pressure value into the output voltage value of the controllable DC power supply. It outputs the corresponding output current to the segmented electromagnets to excite the segmented electromagnets to generate a magnetic field. The magnetic field of the segmented electromagnets exerts an attractive force on the segmented pressure bars in the direction of the segmented electromagnets, stretching the corresponding fixed springs to produce deformation, causing the segmented pressure bars to move closer to the segmented electromagnets, generating the preset gripping force value.

[0008] In one embodiment of the present invention, the surfaces of the segmented pressure bar and the segmented electromagnet that face each other are convex arc-shaped surfaces.

[0009] In one embodiment of the present invention, the segmented electromagnet is a smooth-surfaced circular tube electromagnet.

[0010] In one embodiment of the present invention, the fixing spring is a double-hook helical tension spring of model LⅥ B1×5×12.25 GB / T2088.

[0011] In one embodiment of the present invention, the magnetic field strength generated by the segmented electromagnet is: , Indicates the number of turns of the segmented electromagnet coil. Indicates the effective magnetic circuit length. This indicates the output current of the controllable DC power supply.

[0012] In one embodiment of the present invention, obtaining the deformation of the fixed spring corresponding to the stretching includes: According to Hooke's Law Obtain the deformation of a fixed spring. , Indicates the stiffness coefficient. This indicates that the magnetic field of the segmented electromagnet exerts an attractive force on the segmented pressure bar in the direction of the segmented electromagnet.

[0013] This invention also provides a multi-channel digital rotor spinning machine using the asynchronous drafting device described above, including a multi-channel sliver feeding drafting device, wherein the multi-channel sliver feeding drafting device comprises, in sequence according to the sliver movement direction: After the multi-channel asynchronous feeding roller, multiple cooked strips are fed in simultaneously; Multi-channel asynchronous feeding rollers allow multiple cooked strips to pass through simultaneously; The segmented pressure device grips and stretches multiple cooked strips separately; The multi-channel asynchronous feeder front rollers hold and stretch the slab before outputting it to the collection horn for output. The servo motor assembly includes multiple motors, which are respectively connected to each roller on the multi-channel asynchronous feed rear roller, the multi-channel asynchronous feed middle roller, and the multi-channel asynchronous feed front roller.

[0014] In one embodiment of the present invention, the multi-channel asynchronous feed front roller further includes: a gathering bell mouth, a gathering feed roller, a combing roller, a rotor, and a yarn guide roller; After being held and drawn, the sliver is gathered and fed through the gathering trumpet mouth, and then fed through the gathering feed roller. The fiber bundles on the gathering feed roller are stripped and separated into multiple single fibers by the combing roller. The multiple single fibers are then gathered and combined by the rotor cup for blending and output, and finally drawn out as finished fiber products by the yarn drawing roller.

[0015] This invention also provides a multi-channel ring spinning machine that uses the asynchronous drafting device described above, which, in the direction of roving movement, includes, in sequence: a feeding bell mouth, an asynchronous feeding back roller, a segmented pressure device, a middle roller, a front roller, a yarn guide hook, a traveler, and a ring. The roving is fed through the feeding bell mouth and asynchronous feeding rear roller, and then after being gripped and drafted by the segmented pressure device, it is fed into the middle roller and front roller; the yarn output from the front roller is pulled by the yarn guide hook to the traveler and ring, and twisted in conjunction with the front roller; the twisted yarn is wound into yarn by the high-speed rotation of the spindle.

[0016] This invention also provides an asynchronous drafting device as described above, which is used in the field of natural and chemical staple fiber spinning to produce blended yarn, variegated yarn, slub yarn, gradient yarn, double-sided yarn, and dotted yarn by asynchronously feeding multiple fiber slivers.

[0017] The technical solution of the present invention has the following advantages compared with the prior art: The asynchronous drafting device of this invention is equipped with a segmented pressure device. Based on segmented electromagnets and segmented pressure bars connected to the upper support via fixed springs, a controllable DC power supply is used to input a preset current value into the segmented electromagnets, exciting them to generate a magnetic field. This magnetic field generates an attractive force on the segmented pressure bars, causing the fixed springs to deform and bringing the segmented pressure bars closer to the electromagnets, thus generating a corresponding gripping force. By adjusting the output current of the controllable DC power supply, the magnitude of the magnetic field is changed, thereby changing the attractive force and the generated gripping force. By using different controllable DC power supplies, different gripping force requirements for each channel are met, improving the stability and quality of the sliver drafting motion.

[0018] On a multi-channel digital rotor spinning machine, the multi-channel sliver feeding and drafting device of this invention utilizes a servo motor set to control the rotational speed of each roller, satisfying the real-time and flexible adjustment of fiber ratios. This invention uses a multi-channel sliver feeding and drafting device to draft the sliver until the feed setpoint is met, enabling simultaneous feeding of multiple slivers, eliminating the roving process, and using a segmented pressure device to solve the problem of unequal holding force requirements in different channels, thus shortening the multi-channel blending spinning process and improving production efficiency. Attached Figure Description

[0019] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein: Figure 1 This is a schematic diagram of the segmented pressure device provided by the present invention; Figure 2 This is a side view of the segmented pressure device provided by the present invention; Figure 3 This is a schematic diagram of the segmented pressure device provided by the present invention; Figure 4 This is a schematic diagram of the structure of the multi-channel sliver feeding and drafting mechanism of the three-channel digital rotor spinning machine provided by the present invention; Figure 5 This is a schematic diagram of the drafting mechanism of the three-channel ring spinning machine provided by the present invention; Explanation of reference numerals in the instruction manual's attached diagrams: 1. Upper support; 2. Segmented pressure bar; 3. Fixing spring; 4. Lower support; 5. Segmented electromagnet; 6. Controllable DC power supply; 7. Segmented pressure bar shaft; 8. Rear roller shaft; 9. Asynchronous feed rear roller; 10. Middle roller shaft; 11. Asynchronous feed middle roller; 12. Front roller shaft; 13. Asynchronous feed front roller; 14. Assembly bell mouth; 15. Assembly feed roller shaft; 16. Assembly feed roller; 17. Servo motor assembly; 18. Bell mouth; 19. Middle roller; 20. Front roller. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0021] Reference Figure 1 and Figure 2 The diagram shown is a structural schematic of the segmented pressure device of the present invention. The device specifically includes: The upper bracket 1 is set parallel to the axis of the asynchronous feeding roller of the N channel; N segmented pressure bars 2, the lengths of which correspond to and match the N rollers on the rollers after asynchronous feeding through N channels; 2N fixed springs 3, each fixed spring is connected to the segmented pressure bar at one end and to the upper bracket at the other end, and each segmented pressure bar is suspended on the upper bracket by 2 fixed springs; The lower bracket 4 is arranged parallel to the lower part of the upper bracket directly below it; N segmented electromagnets 5 are respectively arranged directly below the N segmented pressure bars, and their length is the same as that of the segmented pressure bars, and they are embedded and fixed in the lower bracket; N controllable DC power supplies 6 are respectively connected to the N segmented electromagnets; The control system is communicatively connected to the N controllable DC power supplies. It is used to preset the required gripping force pressure value for each channel of the N-channel asynchronous stretching device, and convert the gripping force pressure value into the output voltage value of the controllable DC power supply. It outputs the corresponding output current to the segmented electromagnets to excite the segmented electromagnets to generate a magnetic field. The magnetic field of the segmented electromagnets exerts an attractive force on the segmented pressure bars in the direction of the segmented electromagnets, stretching the corresponding fixed springs to produce deformation, causing the segmented pressure bars to move closer to the segmented electromagnets, generating the preset gripping force value.

[0022] The segmented pressure bar 2 has protruding segmented pressure bar shafts 7 on both sides, which are used to connect with the fixed springs 3. The segmented pressure bar shafts 7 at both ends are suspended on the upper bracket 1 by the two fixed springs 3.

[0023] The segmented pressure device and the N-channel asynchronous feed roller are located within the asynchronous drafting device. Specifically, refer to... Figure 3 The diagram shows the principle of the segmented pressure device. The segmented pressure bar acts as a fixed magnetic strip, while the segmented electromagnet, controlled by a controllable DC power supply, acts as an adjustable magnetic strip. The two attract each other through magnetic force, which is manifested by the deformation of the spring suspending the segmented pressure bar. The operator inputs the required gripping force for each channel via the main control panel. After processing by the control terminal, this is converted into the output voltage value of the controllable DC power supply and transmitted to the corresponding controllable DC power supply for each channel. The output voltage value of the controllable DC power supply determines the magnitude of the current flowing into the corresponding segmented electromagnet. Different currents create magnetic fields of different magnitudes, which exert different magnetic forces on the corresponding segmented pressure bar, giving it an attractive force towards the segmented electromagnet. This causes the spring to stretch and deform, causing the segmented pressure bar to move towards the segmented electromagnet, generating a corresponding gripping force on the fibers within the channel.

[0024] Specifically, the controllable DC power supply has an output voltage of 0V-30V and an output current of 0A-30A, and can achieve automatic switching between voltage and current regulation, and output preset voltage and current.

[0025] Specifically, the specifications of the segmented pressure bar are selected according to the application scenario; the diameter generally ranges from 8mm to 25mm; the length is adapted to the asynchronous feeding roller, typically 1cm to 5cm. In the initial state where the segmented electromagnet is not energized, two fixed springs stably suspend the two ends of the segmented pressure bar on the injured nail. After the segmented electromagnet is energized, it exerts a force of magnitude [missing value]. Its appeal.

[0026] Specifically, the fixing spring is a double-hook helical tension spring, and different models of springs are selected according to the specifications of the segmented pressure bar. In one embodiment of the invention, an LШ B1×5×12.25 GB / T 2088 spring is used, which is made of carbon spring steel wire with an elastic modulus of 206E / GPa. One end of the spring is fixed to the upper bracket, and the other end is fixed to the segmented pressure bar. After the segmented electromagnet is energized, the segmented pressure bar tends to move towards the segmented electromagnet due to the magnetic attraction; according to Hooke's Law... , The stiffness coefficient, The spring deformation causes the spring to stretch, and the segmented pressure bar moves downward, causing the passing fiber sliver to be subjected to pressure deformation.

[0027] Specifically, the electromagnet is a cylindrical electromagnet with a smooth surface, and its length is adapted to the segmented pressure bar and asynchronous feed roller. The change in current input via a controllable DC power supply... This changes the corresponding magnetic field strength. , Indicates the number of turns of the segmented electromagnet coil. This indicates the effective magnetic circuit length; by changing the input current, a maximum attractive force of 50 kg can be generated on the corresponding segmented pressure bar.

[0028] In this embodiment of the invention, the gripping force provided by the segmented pressure bars of each channel of the segmented pressure device needs to be determined according to the raw material characteristics and draft ratio of the sliver fed into each channel. The gripping force value should meet the drafting condition of "gripping force > drafting force" to ensure the gripping force required for uniform drafting. The segmented pressure device provided by this invention provides controllable and adjustable gripping force for each channel, which solves the problem of insufficient gripping force and unstable asynchronous drafting caused by the asynchronous feeding roller of the original mechanism relying on the deformation of the roller itself to provide gripping force. It optimizes the phenomenon that the yarn quality deteriorates due to excessively high fiber drafting wave peaks, strengthens the control of fibers, and allows the sliver to enter the subsequent mechanism in a more stable and better state.

[0029] Example 2: The segmented pressure device provided by this invention is applied to a multi-channel digital rotor spinning machine, which includes an asynchronous feed roller, a gathering bell mouth, a gathering feed roller, a carding roller, a rotor, and a yarn guide roller. Since existing multi-channel digital rotor spinning machines only have a feeding section and do not involve a drafting mechanism, a multi-channel sliver feeding and drafting mechanism is set up to achieve simultaneous feeding of multiple slivers.

[0030] When the multi-channel sliver feeding and drafting mechanism is running, the sliver passes through three sets of asynchronous drafting rollers in sequence: the asynchronous feed rear roller, the asynchronous feed middle roller, and the asynchronous feed front roller. A segmented pressure device is installed between the asynchronous feed middle roller and the asynchronous feed front roller. The sliver fed through the asynchronous feed front roller is gathered and collected through the collecting trumpet mouth, then passes through the collecting feed roller. The fiber bundles on the collecting feed roller are stripped, and the cellulose is separated into individual fibers by the combing roller. Several individual fibers are then gathered and combined through the rotor cup for blending and output, and finally, the finished fiber product is drawn out through the yarn drawing roller.

[0031] Reference Figure 4 The diagram shown is a structural schematic of the multi-channel sliver feeding and drafting mechanism of the three-channel digital rotor spinning machine provided in an embodiment of the present invention. Along the direction of sliver input movement, it sequentially includes an asynchronous feeding rear roller, an asynchronous feeding middle roller, a segmented pressure device, an asynchronous feeding front roller, a collecting bell mouth, a collecting feeding roller, and a servo motor assembly. Specifically, it includes: a rear roller shaft 8, an asynchronous feeding rear roller 9, a middle roller shaft 10, an asynchronous feeding middle roller 11, a segmented pressure bar shaft 7, a segmented pressure bar 2, a front roller shaft 12, an asynchronous feeding front roller 13, a collecting bell mouth 14, a collecting feeding roller shaft 15, a collecting feeding roller 16, and a servo motor assembly 17.

[0032] Specifically, the dimensions of each asynchronous feed roller in the multi-channel digital rotor spinning machine are adapted to the fiber quantity and requirements of the sliver. The roller width should be selected as 4cm-5cm to ensure smooth movement of the fiber sliver within each roller group. The total drafting ratio of the drafting mechanism is 0.9-1.2 times the number of slivers, meeting the fiber quantity fed into the carding rollers and rotor. The drafting and feeding section is a dual-zone drafting system. The total drafting ratio is mainly borne by the front zone drafting ratio, while the rear zone drafting ratio is selected between 1.06-1.15. The front zone drafting ratio is determined by the number of slivers, the set feed quantity, and the component feeding ratio. The front zone drafting is provided by the asynchronous feed front roller and asynchronous feed middle roller, while the rear zone drafting is provided by the asynchronous feed rear roller and asynchronous feed middle roller.

[0033] Based on the above description, the application of the aforementioned asynchronous drafting device in a three-channel digital rotor spinning machine specifically includes: S201: The cooked strips are fed sequentially into the asynchronous feeding rollers; S202: The cooked strips are sequentially fed into the asynchronous feeding rollers; S203: The slab is held and stretched by a magnetic segmentation pressure device; S204: The cooked strips are sequentially fed into the asynchronous feeder rollers; S205: Cooked strips are gathered and collected through a funnel-shaped opening; S206: After the cooked strips are gathered and collected, they are fed into the feed roller; S207: Strip the fiber bundles fed onto the rollers and separate them into multiple single fibers by the combing rollers; S208: The multi-strand single fibers obtained from carding are aggregated and combined through a rotor for blending and output; S209: Fibers produced by rotor blending are drawn out by the drawing rollers to form finished fiber products.

[0034] Based on the above description, in this embodiment of the invention, a three-channel digital rotor spinning machine is used to produce mixed-color yarn, and the feed amount of sliver is set to... (g / 5m), the linear density after stretching is (g / 5m), the linear speed of each rear roller driven independently by a servo motor is (m / min), the linear velocity of the middle roller is (m / min), the linear velocity of the front roller is (m / min), therefore: The draw ratio of the rear zone of each channel is: : By setting the linear speed of the rear roller and the linear velocity of the middle roller Determine the back zone draw ratio ; The draw ratio of the front zone of each channel is: : By setting the front roller linear speed and the linear velocity of the middle roller Determine the front zone stretch ratio The specific multiplier is set based on the number of cooked strips, the set feeding amount, the component feeding ratio, and other conditions. The total draw ratio for each channel is : By setting the front roller linear speed and the linear velocity of the rear roller The total draw ratio is determined to be The specific multiplier setting must meet the fiber quantity fed into the combing roller and the rotor.

[0035] In this embodiment, the three-channel digital rotor spinning machine is a dual-zone drafting machine with a total drafting ratio of [missing information]. Mainly determined by the front zone draw ratio The formula is: i = 1, 2, 3, which represents the components of cooked strips fed into the three channels.

[0036] Specifically, when the roller speed is high, the sliver weight is heavy, and the draft ratio is high, the roller pressure should be heavy. When cotton fibers are blended with chemical fibers, the pressure should be about 20% higher than when spinning pure cotton, and about 30% higher when processing pure chemical fibers. Generally, the pressure in the main drafting zone is 250N-400N. Heavy pressure processes place higher demands on mechanical manufacturing and roller stiffness.

[0037] Based on the above description, in this embodiment, a rotor-spun blended yarn is produced using 20g / 5m pure cotton and 18g / 5m viscose sliver. Specific parameters are shown in Table 1. Table 1: Process Parameters for Producing Rotor-Spun Blended Yarn from Pure Cotton and Viscose Slivers

[0038] This embodiment addresses the technical challenge of simultaneously feeding multiple slivers, which is limited by the feeding and combing mechanisms and related processes in traditional rotor spinning. Traditional rotor spinning typically sets the feed rate to 14-20 g / 5m, and the basis weight of a single sliver is generally 12-25 g / 5m. This allows for the simultaneous feeding of multiple slivers on a multi-channel rotor spinning machine to produce mixed-color yarn. In this embodiment, multiple slivers are drafted by rollers, and a magnetic segmented pressure device solves the technical challenge of varying holding forces in different channels. This satisfies the requirement for simultaneous feeding of multiple slivers into rotor spinning, eliminates the roving process, and achieves the goal of shortening the spinning process and improving production efficiency in multi-channel colored spinning.

[0039] Based on the above description, in this embodiment, a 15g / 5m red, yellow and blue three-color pure cotton sliver is selected to produce rotor-spun slub yarn. The specific parameters are shown in Table 2. Table 2: Process Parameters for Rotor Spinning Slub Yarn from Red, Yellow and Blue Three-Color Pure Cotton Sliver

[0040] This embodiment demonstrates the spinning of slub yarn on a three-channel digital rotor spinning machine. It enables asynchronous feeding and drafting of multiple slivers, and motor control allows for real-time adjustment of fiber ratios, providing flexibility and adaptability. The multiple slivers are pressurized by a magnetic segmented pressure device, achieving the required holding force for each sliver under varying drafting forces, thus improving the stability and quality of the sliver drafting motion.

[0041] In summary, this invention applies a multi-channel sliver feeding and drafting device to a multi-channel digital rotor spinning machine, ensuring that each fiber component corresponds one-to-one with the asynchronous feeding rollers. Each roller has a motor controlling its rotation speed, enabling online controllable and adjustable feeding of multiple slivers in the multi-channel digital rotor spinning machine. Furthermore, by utilizing the multi-channel sliver feeding and drafting mechanism, the roving process can be eliminated, shortening the production process of the multi-channel digital rotor spinning machine and improving yarn production efficiency.

[0042] Example 3: The segmented pressure device provided by this invention is applied to the drafting mechanism of a multi-channel ring spinning machine; the drafting mechanism of the multi-channel ring spinning machine is a dual-drive drafting mechanism, with the main drafting ratio being borne by the forward drafting ratio, and the backward drafting ratio ranging from 1.2 to 1.5; each roving component shares a single forward drafting ratio, and the forward drafting ratio is determined according to the roving weight ratio and the designed yarn fineness.

[0043] A multi-channel ring spinning machine includes multiple feed bells, a drafting mechanism, yarn guide hooks, travelers, a bobbin, and a yarn tube. The drafting mechanism of the multi-channel ring spinning machine includes multiple asynchronous drafting back rollers for feeding slivers, a segmented pressure device, a middle roller, and a front roller. Front zone drafting is achieved using the front and middle rollers, while rear zone drafting is achieved using the middle roller and the asynchronous feed bells. During operation, the roving from each channel is fed into the asynchronous feed bells through multiple feed bells, then passes through the segmented pressure device provided in this invention, and finally passes through a middle roller and a front roller before exiting the drafting mechanism. The drafted roving output from the drafting mechanism is then gathered by the yarn guide hooks, twisted by the travelers and bobbin, and wound onto the yarn tube, thus achieving the drafting of the roving.

[0044] Reference Figure 5The diagram shown is a structural schematic of the drafting mechanism of a three-channel ring spinning machine provided in an embodiment of the present invention. Along the direction of roving movement, it sequentially includes a feeding bell mouth, an asynchronous feeding rear roller, a segmented pressure device, a middle roller, and a front roller. Specifically, it includes: a bell mouth 18, a rear roller shaft 8, an asynchronous feeding rear roller 9, a segmented pressure bar shaft 7, a segmented pressure bar 2, a middle roller shaft 10, a middle roller 19, a front roller shaft 12, a front roller 20, and a servo motor assembly 17.

[0045] The dimensions of the asynchronous feeding roller are adapted to the quantitative and drafting requirements of the roving fiber. The roller width is selected from 1cm to 2cm, so that the fiber roving can move smoothly within the roller group.

[0046] Based on the above description, in this embodiment of the invention, when the asynchronous drafting device is applied to a multi-channel ring spinning machine, the roving sequentially passes through the following steps: S301: The rovings are fed into the bell mouth in sequence; S302: The roving is fed sequentially into the asynchronous feeding rollers; S303: Roving is held and drafted by a segmented pressure device; S304: The roving is fed into the middle rollers in sequence; S305: The roving is fed into the front rollers in sequence; S306: The roving is drawn by the guide hook from the front roller to the traveler and ring, and twisted in conjunction with the front roller; S307: The twisted yarn is wound into yarn by the high-speed rotation of the spindle.

[0047] Specifically, in a three-channel ring spinning machine, using the aforementioned asynchronous drafting device, the feed rate of roving is set to... (g / 10m), the linear density of the designed yarn is (tex), the linear speed of each rear roller driven independently by a servo motor is (m / min), the linear velocity of the middle roller is (m / min), the linear velocity of the front roller is (m / min), therefore: The draw ratio of the rear zone of each channel is: : By setting the rear roller linear speed and the linear velocity of the middle roller Determine the back zone draw ratio The selected range is between 1.2 and 1.5.

[0048] The draw ratio of the front zone of each channel is: : By setting the front roller linear speed and the linear velocity of the middle roller Determine the front zone stretch ratio Each roving component shares a front zone draft ratio, with the specific ratio set in conjunction with the back zone draft ratio and the total draft ratio.

[0049] The total draw ratio for each channel is : By setting the front roller linear speed and the linear velocity of the rear roller The total draw ratio is determined to be The specific multiples are set according to the design yarn fineness, the amount of roving fed and its proportion, and other conditions.

[0050] From the above formula, we can see that the total draw ratio Mainly determined by the front zone draw ratio The formula is: i = 1, 2, 3, which represents the components of roving fed into the three channels.

[0051] Therefore, when the roller speed is high, the sliver weight is heavy, and the draft ratio is high, the roller pressure should be heavy. When cotton fibers are blended with chemical fibers, the pressure should be about 20% higher than when spinning pure cotton and about 30% higher than when processing pure chemical fibers. For pure cotton fibers, the roller pressure after asynchronous drafting is generally set to 6~14 daN / double spindle; for cotton-type chemical fibers, the roller pressure after asynchronous drafting is generally set to 10~18 daN / double spindle; and for medium-length chemical fibers, the roller pressure after asynchronous drafting is generally set to 14~20 daN / double spindle.

[0052] Specifically, ring-spun mixed-color yarn was produced using red, yellow, and blue pure cotton rovings, each with a basis weight of 6 g / 10m. The specific parameters are shown in Table 3. Table 3: Process Parameters for Producing Ring-Spun Blended Yarn from Red, Yellow and Blue Three-Color Pure Cotton Roving

[0053] As shown in Table 3, the yarn obtained in this embodiment, compared with the yarn produced by a ring spinning machine without the added magnetic segmented pressure device, shows that the yarn dryness of this embodiment is optimized by 9.3%, and harmful hairiness is reduced by 15.1%. This embodiment achieves the required holding force for each roving under different variable drafting force requirements, improving the stability and quality of sliver drafting movement.

[0054] Specifically, red, yellow, and white pure cotton rovings with a basis weight of 4.5 g / 10m were selected to produce ring-spun colored yarn. The specific parameters are shown in Table 4. Table 4: Parameters for producing colored yarn from ring-spun sections of red, yellow and white pure cotton roving

[0055] This embodiment demonstrates the use of a three-channel ring spinning machine to spin multi-sliver colored yarn. Asynchronous feeding and drafting of multiple slivers are achieved, and motor control enables real-time adjustment of fiber proportions, providing a flexible and versatile technical effect. Each channel's fiber composition corresponds one-to-one with multiple rollers on the asynchronous feeding rollers. Each roller's rotation speed is controlled by a motor, allowing for equal drafting of rovings with different weights, or unequal drafting of rovings with the same weight, achieving online controllable and adjustable multi-component roving feeding ratios. Furthermore, the multiple slivers are pressurized by a magnetic segmented pressure device, providing the required holding force for each sliver under different back zone drafting requirements, improving the stability and quality of the sliver drafting motion.

[0056] This invention also provides an asynchronous drafting device as described above, applicable to the field of natural and chemical staple fiber spinning, utilizing asynchronous feeding of various fiber slivers to produce blended yarn, variegated yarn, slub yarn, gradient yarn, double-sided yarn, and speckled yarn. The natural staple fibers include cotton, linen, and wool; the chemical staple fibers include polyester staple yarn, acrylic staple fiber, viscose staple fiber, nylon staple fiber, polypropylene staple fiber, and vinylon staple fiber.

[0057] The asynchronous drafting device of this invention is equipped with a segmented pressure device. Based on segmented electromagnets and segmented pressure bars connected to the upper support via fixed springs, a controllable DC power supply is used to input a preset current value into the segmented electromagnets, exciting them to generate a magnetic field. This magnetic field exerts an attractive force on the segmented pressure bars, causing the fixed springs to deform and bringing the segmented pressure bars closer to the electromagnets, generating a corresponding gripping force. By adjusting the output current of the controllable DC power supply, the magnitude of the magnetic field is changed, thereby changing the attractive force and the generated gripping force. By using different controllable DC power supplies, different gripping force requirements for each channel are met, improving the stability and quality of the sliver drafting motion.

[0058] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An asynchronous drafting device, comprising N-channel asynchronous feed rollers, characterized in that, It also includes a segmented pressure device, which comprises: The upper support is arranged parallel to the axis of the N-channel asynchronous feed roller; N segmented pressure bars, the length of which corresponds to and matches the N rollers on the rollers after asynchronous feeding through N channels; 2N fixed springs, each fixed spring is connected to the segmented pressure bar at one end and to the upper bracket at the other end, and each segmented pressure bar is suspended on the upper bracket by 2 fixed springs; The lower support is arranged parallel to and directly below the upper support; N segmented electromagnets are respectively arranged directly below the N segmented pressure bars, and their length is the same as that of the segmented pressure bars, and they are embedded and fixed in the lower bracket; N controllable DC power supplies are respectively connected to the N segmented electromagnets; The control system is communicatively connected to the N controllable DC power supplies. It is used to preset the required gripping force pressure value for each channel of the N-channel asynchronous stretching device, and convert the gripping force pressure value into the output voltage value of the controllable DC power supply. It outputs the corresponding output current to the segmented electromagnets to excite the segmented electromagnets to generate a magnetic field. The magnetic field of the segmented electromagnets exerts an attractive force on the segmented pressure bars in the direction of the segmented electromagnets, stretching the corresponding fixed springs to produce deformation, causing the segmented pressure bars to move closer to the segmented electromagnets, generating the preset gripping force value.

2. The asynchronous drawing device according to claim 1, characterized in that, The surfaces of the segmented pressure bar and the segmented electromagnet that face each other are convex arc-shaped surfaces.

3. The asynchronous drawing device according to claim 2, characterized in that, The segmented electromagnet is a smooth-surfaced circular tube electromagnet.

4. The asynchronous drawing device according to claim 1, characterized in that, The fixing spring is a double-hook helical tension spring of model LⅥ B1×5×12.25 GB / T 2088.

5. The asynchronous drawing device according to claim 1, characterized in that, The magnetic field strength generated by the segmented electromagnet is , Indicates the number of turns of the segmented electromagnet coil. Indicates the effective magnetic circuit length. This indicates the output current of the controllable DC power supply.

6. The asynchronous drawing device according to claim 1, characterized in that, The determination of the deformation of the fixed spring corresponding to the stretching includes: According to Hooke's Law Obtain the deformation of a fixed spring. , Indicates the stiffness coefficient. This indicates that the magnetic field of the segmented electromagnet exerts an attractive force on the segmented pressure bar in the direction of the segmented electromagnet.

7. A multi-channel digital rotor spinning machine employing the asynchronous drafting device as described in any one of claims 1 to 6, characterized in that, The device includes a multi-channel sliver feeding and drawing apparatus, which, in accordance with the direction of sliver movement, comprises: After the multi-channel asynchronous feeding roller, multiple cooked strips are fed in simultaneously; Multi-channel asynchronous feeding rollers allow multiple cooked strips to pass through simultaneously; The segmented pressure device grips and stretches multiple cooked strips separately; The multi-channel asynchronous feeder front rollers hold and stretch the slab before outputting it to the collection horn for output. The servo motor assembly includes multiple motors, which are respectively connected to each roller on the multi-channel asynchronous feed rear roller, the multi-channel asynchronous feed middle roller, and the multi-channel asynchronous feed front roller.

8. The multi-channel digital rotor spinning machine according to claim 7, characterized in that, The multi-channel asynchronous feed front roller also includes: a gathering bell mouth, a gathering feed roller, a combing roller, a rotor, and a yarn guide roller; After being held and drawn, the sliver is gathered and fed through the gathering trumpet mouth, and then fed through the gathering feed roller. The fiber bundles on the gathering feed roller are stripped and separated into multiple single fibers by the combing roller. The multiple single fibers are then gathered and combined by the rotor cup for blending and output, and finally drawn out as finished fiber products by the yarn drawing roller.

9. A multi-channel ring spinning machine employing the asynchronous drafting device as described in any one of claims 1 to 6, characterized in that, In the order of roving movement, the components are: feeding bell mouth, feeding asynchronous back roller, segmented pressure device, middle roller, front roller, yarn guide hook, traveler and ring; The roving is fed through the feeding bell mouth and asynchronous feeding rear roller, and then after being gripped and drafted by the segmented pressure device, it is fed into the middle roller and front roller; the yarn output from the front roller is pulled by the yarn guide hook to the traveler and ring, and twisted in conjunction with the front roller; the twisted yarn is wound into yarn by the high-speed rotation of the spindle.

10. An asynchronous drafting device as described in any one of claims 1-6, used in the field of natural staple fiber and chemical staple fiber spinning to produce blended yarn, variegated yarn, slub yarn, gradient yarn, double-sided yarn and dotted yarn by asynchronously feeding multiple fiber slivers.

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