A double feeding twist system with upper and lower layer spool cans

Abstract

The application discloses a double-feeding type twisting system for upper and lower spool cans, which comprises a twisting machine, a plurality of upper and lower spool can assemblies arranged on the twisting machine, upper and lower spool can assemblies, a side magnetic auxiliary threading system arranged on one side of the upper and lower spool can assemblies, a capacitive induction type automatic threading system arranged on one side of a shell of the twisting machine, single yarn A and single yarn B led out along a tension passage between the upper and lower spool can assemblies, and plying and twisting actions of the single yarn A and the single yarn B completed simultaneously under the condition that the single yarn A and the single yarn B are continuously wound at a winding part, and finally forming a twisted yarn C. The device reduces the plying process steps, saves the processing time of twisting of multiple yarns, saves unnecessary costs spent due to purchase of plying equipment, helps users to reduce production economic investment, and maximizes the labor intensity of manual operation by application of intelligent touch buttons and sensing detection devices.

Description

Technical Field

[0001] This invention relates to a dual-feed twisting system with upper and lower spindle tanks, belonging to the field of textile equipment technology. Background Technology

[0002] Traditionally, before twisting yarn, a doubling machine requires a yarn-joining process on a plying machine. Therefore, to obtain a finished yarn with a specified twist, traditional processing methods require two processes: yarn-joining and twisting. This necessitates that yarn manufacturers purchase a twisting machine and also purchase additional yarn-joining and plying equipment, resulting in significant costs, especially the additional labor costs for operating the machines.

[0003] In existing technical solutions, conventional twisting processes and systems require a yarn doubling process before the twisting process of yarn (taking type A and type B single yarns as examples) C can be performed. Figure 1 and Figure 2 In the process, single yarns A01 and B02 are processed and wound synchronously on the yarn doubling machine 04 (referred to as yarn doubling), eventually forming a ply yarn C03. Under human intervention, the ply yarn C03 is twisted by a regular twisting machine 05. Before twisting, the ply yarn C03 needs to be placed into a regular twisting spindle can device 07. Then, the yarn end of the ply yarn 03 is led out by a regular mechanical pedal-type yarn threading system 06 and pulled to the winding function position of the regular twisting machine device 05. Then, the yarn twist is imparted under the high-speed rotation of the spindle (referred to as twisting), finally forming a twisted yarn D.

[0004] The above solution still has the following technical defects: 1) For some yarns with low twist requirements, this process (combining yarns first and then twisting) is quite cumbersome and consumes a lot of time and labor costs; 2) The overall investment cost of traditional ordinary twisting system equipment is relatively large. In addition to purchasing ordinary twisting equipment, it is also necessary to purchase a yarn doubling device, resulting in a large equipment investment cost. 3) The automation level of the equipment is not high, especially the ordinary pedal-type yarn threading system, which requires manual force to step on the pedal to complete the spindle braking and centralized pneumatic yarn threading. The labor intensity is high and the level of intelligence is low. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a dual-feed twisting system with upper and lower spindles. This system pioneers a new process mode that integrates yarn doubling and twisting processes, condensing what previously required two systems into a single system. Furthermore, it utilizes automated program control to streamline the operation of the equipment, reducing the process flow and production costs (labor and equipment investment), significantly saving time in producing finished twisted yarn, and increasing the yield of finished yarn.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a double-feed twisting system with upper and lower spindles, including a twisting machine; the twisting machine is provided with multiple upper and lower spindle assemblies; the upper and lower spindle assemblies include an upper spindle assembly and a lower spindle assembly; a side magnetic auxiliary yarn threading system is also provided on one side of the upper and lower spindle assemblies; a capacitive induction automatic yarn threading system is provided on one side of the twisting machine housing; the lower spindle assembly is used for drawing out single yarn B; the upper spindle assembly is used for drawing out single yarn A; single yarn A and single yarn B are drawn out along the tension channel between the upper and lower spindle assemblies, and while the winding part is continuously winding, single yarn A and single yarn B simultaneously complete the plying and twisting actions, finally forming a twisted yarn C.

[0007] Furthermore, the upper spindle assembly includes an upper spindle; an upper spindle yarn channel tube is provided at the center of the upper spindle; an upper feed yarn roll is provided outside the upper spindle yarn channel tube; the core yarn tube of the upper feed yarn roll is sleeved on the upper spindle yarn channel tube; a counterweight iron ring is provided at the bottom of the upper spindle; a disc-shaped base is provided at the bottom of the upper spindle yarn channel tube; a hollow stepped channel is provided on the side of the disc-shaped base, which allows the single yarn B drawn out to pass into the yarn channel of the upper spindle and merge with the single yarn A drawn out, and then pass back into the lower spindle yarn channel tube; the maximum outer diameter of the upper spindle yarn channel tube is smaller than the inner diameter of the core yarn tube of the upper feed yarn roll; The bottom outer edge of the upper spindle can is engaged with the upper eaves of the lower spindle can; the bottom of the yarn channel tube of the upper spindle can is aligned with the top of the yarn channel tube of the lower spindle can, forming a new upper and lower integral sealed channel.

[0008] Furthermore, the lower spindle assembly includes a lower spindle; a lower spindle yarn channel tube is provided at the center of the lower spindle; a lower feed yarn roll (23) is provided outside the lower spindle yarn channel tube; the core yarn tube of the lower feed yarn roll is sleeved on the lower spindle yarn channel tube; a negative pressure ceramic suction tube is pre-embedded inside the lower spindle yarn channel tube; a lower yarn guide nozzle is pre-embedded on the bottom side of the lower spindle; the lower yarn guide nozzle, the negative pressure ceramic suction tube, and the lower spindle yarn channel tube form a tube passage for the single yarn A and the single yarn B to be drawn out; a twisting spindle is installed at the bottom of the lower spindle, which is used to twist the AB yarn after plying to form twisted yarn C.

[0009] Furthermore, a bottom pneumatic nozzle is installed at the bottom of the twisting spindle; the bottom pneumatic nozzle is used to provide negative pressure gas for drawing in yarn to the internal channels of the upper spindle yarn channel tube and the lower spindle yarn channel tube; a solenoid valve assembly is installed on one side of the bottom pneumatic nozzle; the solenoid valve assembly is used to control the start and stop of the bottom pneumatic nozzle; a sensor is also installed on the solenoid valve assembly, which is used to detect the foot movements of the operator.

[0010] Furthermore, a side magnetic auxiliary yarn threading system is installed on one side of the upper and lower spindle tank assembly; the side magnetic auxiliary yarn threading system includes a side-mounted sheet metal; the side-mounted sheet metal is fixed to the frame of the twisting machine; a single-spindle air storage cavity is provided on the side-mounted sheet metal; the single-spindle air storage cavity is a round-headed disc structure with a blind hole in the center, and an exhaust hole is provided on the inner wall near the top of the blind hole; an electromagnet is sleeved on the single-spindle air storage cavity; the electromagnet is disc-shaped with a through hole in the center, and the electromagnetic attraction force of the electromagnet is controlled by an on / off button; a compressed air conduit is installed in the inner cavity of the side-mounted sheet metal, and one side of the conduit is connected to the single-spindle air storage cavity; The single-spindle gas storage cavity is also reserved with a central mounting channel for connecting to the tubular tail end of the blade-type support bracket; the tubular tail end of the blade-type support bracket has a central channel at its center, and a nozzle is installed in the central channel; the nozzle has an exhaust hole at its top, and two gas inlet guide holes are provided on the side of the nozzle, which are connected to the exhaust hole at its top; a sealing ring is provided at the tail of the nozzle; a return spring is connected to one side of the nozzle; the return spring is pressed into the tubular bottom of the central channel of the blade-type support bracket.

[0011] A method for operating a dual-feed twisting system with upper and lower ingot tanks includes the following steps: Step 1: First, place the upper feed yarn roll into the upper spindle assembly, and simultaneously remove the upper spindle assembly from above the lower spindle assembly. Then, place the lower feed yarn roll into the lower spindle assembly. Next, place the single yarn B drawn from the lower feed yarn roll onto the air jet nozzle at point P of the nozzle. At this time, the air jet nozzle is in the closed state. Then, align the upper spindle assembly containing the upper feed yarn roll onto the blade-type support bracket, so that the nozzle opening is exactly aligned with the middle of the upper spindle yarn channel tube of the upper spindle assembly. The yarn B drawn from the lower feed yarn roll is exactly between the nozzle and the upper spindle yarn channel tube. Step Two: After the upper spindle can is placed, the lower feed yarn roll is pressed to the designated yarn threading position. Press the power button to energize the electromagnet, which begins to attract the counterweight ring. The counterweight ring then pulls the entire upper spindle can closer to the electromagnet. The end of the blade-type support bracket slowly slides into the central blind hole of the single spindle air storage cavity until the compression resistance inside the hole balances with the electromagnetic attraction. During this approach process, the tail of the upper spindle can yarn channel tube in the upper spindle can begins to exert a squeezing force on the nozzle tip. After the nozzle tip aligns with the tail of the upper spindle can yarn channel tube, it is subjected to the downward pressure of the upper spindle can yarn channel tube and begins to retract within the channel of the blade-type support bracket, compressing the return spring. Due to the sliding of the nozzle... As the nozzle retracts, the rubber ring at the nozzle tail, which blocks the connection between the blade-type support bracket and the single-spindle air storage cavity, retracts along with the nozzle. The gas channel at the top of the single-spindle air storage cavity is opened, and the gas rushes out of the single-spindle air storage cavity and directly enters the end channel of the blade-type support bracket. It then rushes into the side air inlet hole of the nozzle and is ejected from the air jet port at point P, which is connected to it. The gas is then injected into the upper spindle can yarn channel tube that is matched with it. The single yarn B, which is pressed between the tail of the upper spindle can yarn channel tube and the nozzle, is guided by the ejected gas and is directly ejected upward along the channel opening of the upper spindle can yarn channel tube to the end. At this time, there are two single yarns, A and B, in the upper spindle can. Step 3: Reset the power on / off button. The electromagnet loses power and the attraction of the electromagnet to the counterweight ring disappears. The reset spring releases its elasticity, pushing the nozzle back to its original position. The extension of the nozzle drives the tail rubber ring to continue blocking back to point M. At this time, the gas is blocked in the single ingot gas storage cavity, and no more gas is ejected from the nozzle. The upper ingot tank returns to its original initial position. When the upper spindle assembly on the auxiliary yarn threading device is fully reset, manually place the assembly containing the upper feed yarn roll and the lower feed yarn roll leading out single yarn B on top of the lower spindle, with the yarn channel tube of the upper spindle and the yarn channel tube of the lower spindle aligned and the edges of the upper and lower spindles aligned. The operator triggers the sensor by moving their foot, the solenoid valve assembly opens, and the bottom pneumatic nozzle sprays compressed air upwards. The negative pressure ceramic suction tube converts the blown compressed air into a downward suction force, which extends all the way to the top of the yarn channel tube of the upper spindle, drawing the single yarn A from the upper yarn roll and the single yarn B from the lower feed yarn roll back into the yarn channel tube of the upper spindle. Then, the yarn passes through the yarn channel tube of the lower spindle and the negative pressure ceramic suction tube, and is discharged through the lower yarn guide nozzle, forming a plied yarn. Finally, the two plied single yarns A and B are twisted again under the high-speed rotation of the twisting spindle.

[0012] The beneficial effects of this invention are: 1. It greatly shortens the yarn twisting process, reduces processing steps, and saves production time.

[0013] 2. The fully automatic side-assisted yarn threading and capacitive sensing automatic yarn threading system are adopted, which improves the automation level of equipment operation.

[0014] 3. Only one piece of equipment is needed to replace the processing technology that previously required two pieces of equipment. This innovative technology reduces the direct procurement cost of equipment hardware for end users, while also helping end users reduce the area of ​​equipment space used, improve the utilization rate of the space, and save resources. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the yarn doubling process structure in the background technology; Figure 2 This is a schematic diagram of the twisting process structure in the background technology; Figure 3 This is a schematic diagram of the novel twisting system with dual feeding in upper and lower ingot tanks according to the present invention; Figure 4 This is a schematic side view of the novel twisting system with dual feeding in upper and lower ingot tanks according to the present invention. Figure 5 This is a partial structural diagram of the novel double-feed twisting system with upper and lower ingot tanks of the present invention; Figure 6 A schematic diagram (placement) of the upper spindle tank auxiliary single yarn B performing the yarn threading action in this invention; Figure 7 For the present invention Figure 5 Enlarged schematic diagram of part of the structure; Figure 8 A schematic diagram of the yarn threading action (auxiliary yarn threading) of the upper spindle tank auxiliary single yarn B of the present invention. Figure 9 For the present invention Figure 6 Enlarged schematic diagram of part of the structure; Figure 10 This is a schematic diagram of the lower spindle tank of the present invention performing a concentrated yarn threading action on A and B. Figure 1 (Concentrated threading); Figure 11 This is a schematic diagram illustrating the concentrated yarn threading action performed by the lower spindle can of the present invention on A and B. Figure 2 (Concentrate on threading the yarn).

[0016] In the diagram: 01, Single yarn A; 02, Single yarn B; 03, Ply yarn C; 04, Yarn doubling machine; 05, Ordinary twisting machine; 06, Mechanical pedal-type yarn threading system; 07, Ordinary twisting spindle can device. 1. Twisting machine; 2. Side magnetic auxiliary yarn feeding system; 3. Twisted yarn C; 4. Capacitive induction automatic yarn feeding system; 5. Single yarn B; 6. Lower spindle tank assembly; 7. Single yarn A; 10. Upper spindle tank assembly; 11. Upper spindle tank; 12. Upper feed yarn roll; 13. Upper spindle tank yarn channel tube; 14. Single yarn A; 15. Return spring; 17. Blade-type support bracket; 18. Nozzle; 19. Single spindle air storage cavity; 2 0. Compressed air duct; 21. Side mounting sheet metal; 22. Lower spindle can yarn channel pipe; 23. Lower feed yarn roll; 24. Single yarn B; 25. Lower yarn guide nozzle; 26. Negative pressure ceramic suction tube; 27. Power on / off button; 28. Lower spindle can; 30. Twisted yarn C (AB yarn); 31. Counterweight iron ring; 32. Electromagnet; 35. Induction detector; 36. Solenoid valve assembly; 37. Bottom pneumatic nozzle; 38. Twisting spindle. Where P is the jet nozzle and M is the first release point. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0019] like Figure 3 and Figure 4As shown, a dual-feed twisting system with upper and lower spindles includes a twisting machine 1; the twisting machine 1 is equipped with multiple upper and lower spindle components; the upper and lower spindle components include an upper spindle component 10 and a lower spindle component 6; a side magnetic auxiliary yarn threading system 2 is also provided on one side of the upper and lower spindle components; a capacitive induction automatic yarn threading system 4 is provided on one side of the housing of the twisting machine 1; the lower spindle component 6 is used for drawing out single yarn B5; the upper spindle component 10 is used for drawing out single yarn A7; single yarn A7 and single yarn B5 are drawn out along the tension channel between the upper spindle component 10 and the lower spindle component 6, and while the winding part is continuously winding, single yarn A7 and single yarn B5 simultaneously complete the plying and twisting actions, finally forming a twisted yarn C3.

[0020] In this preferred embodiment, refer to... Figure 5 The upper spindle assembly 10 includes an upper spindle 11; an upper spindle yarn channel tube 13 is provided at the center of the upper spindle 11; an upper feed yarn roll 12 is provided on the outside of the upper spindle yarn channel tube 13; the core yarn tube of the upper feed yarn roll 12 is sleeved on the upper spindle yarn channel tube 13; a counterweight iron ring 31 is provided at the bottom of the upper spindle 11; a disc-shaped base is provided at the bottom of the upper spindle yarn channel tube 13; a hollow stepped channel is provided on the side of the disc-shaped base, which allows the single yarn B24 to pass into the yarn channel of the upper spindle 11 and merge with the single yarn A14, and then pass back into the lower spindle yarn channel tube 22; the maximum outer diameter of the upper spindle yarn channel tube 13 is smaller than the inner diameter of the core yarn tube of the upper feed yarn roll 12. The top-feed yarn roll 12 is generally a straight cylindrical or conical cylindrical shape, with a centrally located tubular core lined with paper or plastic yarn tubes.

[0021] The bottom outer edge of the upper spindle tank 11 is engaged with the upper eaves of the lower spindle tank 28; the bottom of the yarn channel tube 13 of the upper spindle tank is aligned with the top of the yarn channel tube 22 of the lower spindle tank, forming a new upper and lower integral sealed channel.

[0022] In this preferred embodiment, the lower spindle assembly 6 includes a lower spindle 28; a lower spindle yarn channel tube 22 is provided at the center of the lower spindle 28; a lower feed yarn roll 23 is provided on the outside of the lower spindle yarn channel tube 22; the core yarn tube of the lower feed yarn roll 23 is sleeved on the lower spindle yarn channel tube 22; a negative pressure ceramic suction tube 26 is pre-embedded inside the lower spindle yarn channel tube 22; a lower yarn guide nozzle 25 is pre-embedded on the bottom side of the lower spindle 28; the lower yarn guide nozzle 25, the negative pressure ceramic suction tube 26, and the lower spindle yarn channel tube 22 form a tube passage for the single yarn A14 and the single yarn B24 to be drawn out; a twisting spindle 38 is installed at the bottom of the lower spindle 28, which is used to twist the AB yarn after plying to form a twisted yarn C3.

[0023] In this preferred embodiment, a bottom pneumatic nozzle 37 is installed at the bottom of the twisting spindle 38; the bottom pneumatic nozzle 37 is used to provide negative pressure gas for sucking yarn into the internal channels of the upper spindle yarn channel pipe 13 and the lower spindle yarn channel pipe 22; a solenoid valve assembly 36 is installed on one side of the bottom pneumatic nozzle 37; the solenoid valve assembly 36 is used to control the start and stop of the bottom pneumatic nozzle 37; a sensor 35 is also installed on the solenoid valve assembly 36, which is used to detect the foot movements of the operator.

[0024] A side magnetic auxiliary yarn threading system 2 is installed on one side of the upper and lower spindle tank assembly; the side magnetic auxiliary yarn threading system 2 includes a side mounting sheet metal 21; the side mounting sheet metal 21 is fixed on the frame of the twisting machine 1; a single spindle air storage cavity 19 is provided on the side mounting sheet metal 21; the single spindle air storage cavity 19 is a round-headed disc structure with a blind hole in the center and an exhaust hole on the inner wall near the top of the blind hole; an electromagnet 32 ​​is sleeved on the single spindle air storage cavity 19; the electromagnet 32 ​​is disc-shaped with a through hole in the center, and the electromagnetic attraction force of the electromagnet 32 ​​is controlled by the on / off button 27; a compressed air conduit 20 is installed in the inner cavity of the side mounting sheet metal 21, and one side of the conduit is connected to the single spindle air storage cavity 19; The single-spindle gas storage cavity 19 is also reserved with a central mounting channel for connecting to the tubular tail end of the blade-type support bracket 17; a central channel is reserved at the center of the tubular tail end of the blade-type support bracket 17, and a nozzle 18 is installed in the central channel; an exhaust hole is opened at the top of the nozzle 18, and two gas inlet guide holes are provided on the side of the nozzle, which are connected to the exhaust hole at the top; a sealing ring is provided at the tail of the nozzle 18; a return spring 15 is connected to one side of the nozzle 18; the return spring 15 is pressed into the tubular bottom of the central channel of the blade-type support bracket 17.

[0025] Implementation principles and control methods: Reference Figures 6-7 First, place the upper feed yarn roll 12 into the upper spindle assembly 10, and simultaneously remove the upper spindle assembly 10 above the lower spindle 28. Then, place the lower feed yarn roll 23 into the lower spindle 28. Next, place the single yarn B drawn from the lower feed yarn roll 23 onto the air jet nozzle P of the nozzle 18. At this time, the air jet nozzle is in the closed state. Then, place the upper spindle assembly 10 containing the upper feed yarn roll 12 onto the blade-type support bracket 17, so that the opening of the nozzle 18 is exactly aligned with the middle of the upper spindle yarn channel tube 13 of the upper spindle assembly 10. The yarn B drawn from the lower feed yarn roll 23 is exactly between the nozzle 18 and the upper spindle yarn channel tube 13. Reference Figures 8-9When the placement of the upper spindle can 11 is completed, the lower feed yarn roll 23 is pressed to the designated yarn threading position. Pressing the power-on / off button 27 energizes the electromagnet 32, which begins to attract the counterweight ring 31. The counterweight ring 31 then moves the entire upper spindle can 11 closer to the electromagnet 32. The end of the blade-type support bracket 17 slowly slides into the middle blind hole of the single-spindle air storage cavity 19 until the compression resistance inside the hole balances with the electromagnetic attraction. During this approach process, the tail of the upper spindle can yarn channel tube 13 in the upper spindle can 11 begins to exert a squeezing force on the end of the nozzle 18. After the end of the nozzle 18 aligns with the tail of the upper spindle can yarn channel tube 13, it is subjected to the downward pressure of the upper spindle can yarn channel tube 13 and begins to retract within the channel of the blade-type support bracket 17, compressing the return spring 15. As nozzle 18 slides back, the rubber ring at the tail of nozzle 18, which is used to block the blade support bracket 17 and the single-spindle gas storage cavity 19, retracts along with nozzle 18. The gas channel at the top of the single-spindle gas storage cavity 19 is opened, and the gas rushes out of the single-spindle gas storage cavity 19 and directly enters the end channel of the blade support bracket 17. It then rushes into the side air inlet hole of nozzle 18 and is ejected from the P jet nozzle through the side air inlet hole of nozzle 18. The gas is then ejected into the upper spindle can yarn channel tube 13 that is matched with it. The single yarn B, which is pressed between the tail of the upper spindle can yarn channel tube 13 and nozzle 18, is guided by the ejected gas and is ejected directly upward along the channel opening of the upper spindle can yarn channel tube 13 to the end. At this time, there are two single yarns, A and B, in the upper spindle can 11. Reference Figures 10-11 When the power on / off button 27 is reset, the electromagnet 32 ​​loses power and the attraction of the electromagnet 32 ​​to the counterweight ring 31 disappears. The reset spring 15 releases its elastic force, pushing the nozzle 18 back to its original position. The extension of the nozzle 18 drives the tail rubber ring to continue blocking back to point M. At this time, the gas is blocked in the single ingot gas storage cavity 19, and no more gas is ejected from the nozzle 18. The upper ingot tank 11 returns to its original initial position. When the upper spindle assembly 10 on the auxiliary yarn threading device is fully reset, manually place the entire assembly containing the upper feed yarn roll 12 and the lower feed yarn roll lead-out single yarn B on top of the lower spindle 28, with the upper spindle yarn channel tube 13 aligned with the lower spindle yarn channel tube 22, and the edges of the upper and lower spindles aligned. The operator triggers the sensor 35 by moving their foot 39, opening the solenoid valve assembly 36, and the bottom pneumatic nozzle 37 sprays compressed air upwards, creating a negative pressure. The ceramic suction tube 26 converts the blown-in compressed air into a downward suction force, which extends all the way to the top of the upper spindle yarn channel tube 13. This suction force draws the single yarn A drawn from the upper yarn roll and the single yarn B drawn from the lower feed yarn roll back to the upper spindle yarn channel tube 13, then through the lower spindle yarn channel tube 22 and the negative pressure ceramic suction tube 26, and is discharged through the lower yarn guide nozzle 25 to form a plied yarn. Finally, the two plied single yarns A and B are twisted again under the high-speed rotation of the twisting spindle 38.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A double-feed twisting system with upper and lower ingot tanks, characterized in that, The system includes a twisting machine (1); the twisting machine (1) is equipped with multiple upper and lower spindle can assemblies; the upper and lower spindle can assemblies include an upper spindle can assembly (10) and a lower spindle can assembly (6); a side magnetic auxiliary yarn threading system (2) is also provided on one side of the upper and lower spindle can assemblies; a capacitive induction automatic yarn threading system (4) is provided on one side of the housing of the twisting machine (1); the lower spindle can assembly (6) is used to draw out single yarn B; the upper spindle can assembly (10) is used to draw out single yarn A; single yarn A and single yarn B are drawn out along the tension channel between the upper spindle can assembly (10) and the lower spindle can assembly (6), and while the winding part is continuously winding, single yarn A and single yarn B simultaneously complete the plying and twisting actions, and finally form twisted yarn C (3). The upper spindle assembly (10) includes an upper spindle (11); an upper spindle yarn channel tube (13) is provided at the center of the upper spindle (11); an upper feed yarn roll (12) is provided outside the upper spindle yarn channel tube (13); the core yarn tube of the upper feed yarn roll (12) is sleeved on the upper spindle yarn channel tube (13); a counterweight iron ring (31) is provided at the bottom of the upper spindle (11); The bottom of the upper spindle yarn channel tube (13) is provided with a disc-shaped base; a hollow stepped channel is provided on the side of the disc-shaped base, which allows the single yarn B to pass through the yarn channel of the upper spindle (11) and merge with the single yarn A, and then pass back into the lower spindle yarn channel tube (22); the maximum outer diameter of the upper spindle yarn channel tube (13) is smaller than the inner diameter of the core yarn tube of the upper feed yarn roll (12); The bottom outer edge of the upper spindle can (11) is engaged with the upper eaves of the lower spindle can (28); the bottom of the yarn channel tube (13) of the upper spindle can is aligned with the top of the yarn channel tube (22) of the lower spindle can, forming a new upper and lower integral sealed channel. The lower spindle assembly (6) includes a lower spindle (28); a lower spindle yarn channel tube (22) is provided at the center of the lower spindle (28); a lower feed yarn roll (23) is provided outside the lower spindle yarn channel tube (22); the core yarn tube of the lower feed yarn roll (23) is sleeved on the lower spindle yarn channel tube (22); a negative pressure ceramic suction tube (26) is pre-embedded inside the lower spindle yarn channel tube (22). The bottom side of the lower spindle tank (28) is pre-embedded with a lower yarn guide nozzle (25); the lower yarn guide nozzle (25), the negative pressure ceramic suction tube (26) and the yarn channel tube (22) of the lower spindle tank form a channel for the single yarn A and the single yarn B to be drawn out; a twisting spindle (38) is installed at the bottom of the lower spindle tank (28), which is used to twist the AB yarn after plying to form twisted yarn C (3); The bottom of the twisting spindle (38) is equipped with a bottom pneumatic nozzle (37); the bottom pneumatic nozzle (37) is used to provide negative pressure gas for sucking yarn into the internal channels of the upper spindle yarn channel tube (13) and the lower spindle yarn channel tube (22); a solenoid valve assembly (36) is installed on one side of the bottom pneumatic nozzle (37); the solenoid valve assembly (36) is used to control the start and stop of the bottom pneumatic nozzle (37); a sensor (35) is also installed on the solenoid valve assembly (36) for detecting the foot movements of the operator. A side magnetic auxiliary yarn threading system (2) is installed on one side of the upper and lower spindle tank assembly; the side magnetic auxiliary yarn threading system (2) includes a side mounting sheet metal (21); the side mounting sheet metal (21) is fixed on the frame of the twisting machine (1); a single spindle air storage cavity (19) is provided on the side mounting sheet metal (21); the single spindle air storage cavity (19) is a round-headed disc structure with a blind hole in the center and an exhaust hole on the inner wall near the top of the blind hole; an electromagnet (32) is sleeved on the single spindle air storage cavity (19); the electromagnet (32) is disc-shaped with a through hole in the center, and the electromagnetic attraction force of the electromagnet (32) is controlled by the power on / off button (27); a compressed air duct (20) is installed in the inner cavity of the side mounting sheet metal (21), and one side of the compressed air duct (20) is connected to the single spindle air storage cavity (19); The single-spindle gas storage cavity (19) is also reserved with a central mounting channel, which is used to connect with the tubular tail end of the blade-type support bracket (17); the central position of the tubular end of the blade-type support bracket (17) is reserved with a central channel, and a nozzle (18) is provided in the central channel; the top of the nozzle (18) is opened with an exhaust hole, and two side air inlet holes are provided on the side of the nozzle, which are connected to the exhaust hole at the top; a sealing ring is provided at the tail of the nozzle (18); a return spring (15) is connected to one side of the nozzle (18); the return spring (15) is pressed into the tubular bottom of the central channel of the blade-type support bracket (17).

2. The operation method of the upper and lower layer spindle double-feed twisting system according to claim 1 includes the following steps: Step 1: First, place the upper feed yarn roll (12) into the upper spindle assembly (10), and at the same time remove the upper spindle assembly (10) from above the lower spindle (28). Then, place the lower feed yarn roll (23) into the lower spindle (28), and place the single yarn B drawn from the lower feed yarn roll (23) onto the air jet port at point P of the nozzle (18). At this time, the air jet port is closed. Then, place the upper spindle assembly (10) containing the upper feed yarn roll (12) onto the blade support bracket (17), so that the mouth of the nozzle (18) is aligned with the middle of the upper spindle yarn channel tube (13) of the upper spindle assembly (10). The single yarn B drawn from the lower feed yarn roll (23) is exactly between the nozzle (18) and the upper spindle yarn channel tube (13). Step 2: After the placement of the upper spindle can (11) is completed, the lower feed yarn roll (23) is pressed to the designated yarn threading position. Press the power on / off button (27), the electromagnet (32) is energized, and begins to attract the counterweight ring (31). Then the counterweight ring (31) drives the entire upper spindle can (11) to move closer to the electromagnet (32). The end of the blade-type support bracket (17) begins to slowly slide into the middle blind hole of the single spindle air storage cavity (19) until the compression resistance in the hole is balanced with the electromagnetic attraction. During this approach process, the tail of the upper spindle can yarn channel tube (13) in the upper spindle can (11) begins to exert a squeezing force on the end of the nozzle (18). After the end of the nozzle (18) aligns with the tail of the upper spindle can yarn channel tube (13), it is subjected to the downward pressure of the upper spindle can yarn channel tube (13) and begins to retract in the channel of the blade-type support bracket (17), compressing the return spring (15). Due to the sliding retraction of the nozzle (18), the rubber ring at the tail of the nozzle (18) used to block the communication between the blade support bracket (17) and the single-spindle gas storage cavity (19) retracts along with the nozzle (18). The gas channel at the top of the single-spindle gas storage cavity (19) is opened, and the gas rushes out of the single-spindle gas storage cavity (19) and directly enters the end channel of the blade support bracket (17), and rushes into the side air inlet hole of the nozzle (18), and then through and The air jet from the P-point nozzle (18) is connected to the side air inlet hole and sprayed into the upper spindle yarn channel tube (13) that is matched with it. The single yarn B of the lower feed yarn roll pressed between the tail of the upper spindle yarn channel tube (13) and the nozzle (18) is guided by the sprayed gas and sprayed directly upward along the channel opening of the upper spindle yarn channel tube (13) to the end. At this time, there are two single yarns A and B in the upper spindle (11). Step 3: Reset the power on / off button (27), the electromagnet (32) loses power, the attraction of the electromagnet (32) to the counterweight ring (31) disappears, the reset spring (15) releases its elastic force, pushing the nozzle (18) back to its original position, the extension of the nozzle (18) drives the tail rubber ring to continue to block back to point M, at this time the gas is blocked in the single ingot gas storage cavity (19), the nozzle (18) no longer sprays gas, and the upper ingot tank (11) returns to its original initial position; When the upper spindle assembly (10) on the auxiliary yarn threading device is fully reset, manually place the entire assembly with the upper feed yarn roll (12) and the lower feed yarn roll leading out single yarn B on top of the lower spindle assembly (28), and align the upper spindle assembly yarn channel tube (13) with the lower spindle assembly yarn channel tube (22), with the edges of the upper and lower spindle assemblies aligned; the operator triggers the sensor (35) by moving their feet (39), the solenoid valve assembly (36) opens, and the bottom pneumatic nozzle (37) sprays compressed air upwards. The negative pressure ceramic suction tube (26) converts the blown-in compressed air into a downward suction force. This suction force extends all the way to the top of the upper spindle yarn channel tube (13), drawing the single yarn A drawn from the upper yarn roll and the single yarn B drawn from the lower feed yarn roll back to the upper spindle yarn channel tube (13). The yarn then passes through the lower spindle yarn channel tube (22) and the negative pressure ceramic suction tube (26), and is discharged through the lower yarn guide nozzle (25) to form a plied yarn. Finally, the two plied single yarns A and B are twisted again under the high-speed rotation of the twisting spindle (38).

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