A yarn contact pressure control system and control method

Abstract

The application provides a bobbin contact pressure control system and control method, comprising a whole machine head, a bobbin compressor air passage, a bobbin single spindle and a control system, the bobbin single spindle comprises a grooved drum, a grooved drum transmission mechanism and a bobbin pressure mechanism, the bobbin pressure mechanism comprises a bobbin cradle, a balance air cylinder, a tension spring and a bobbin cradle swing assembly, and the bobbin compressor air passage comprises a low balance air pressure gas path and a high balance air pressure gas path, the solenoid valve arranged on each balance air cylinder comprises two air inlets and one air outlet, the two air inlets are respectively communicated with the low balance air pressure gas path and the high balance air pressure gas path through a connecting pipeline, the air outlet is communicated with an air inlet hole of the balance air cylinder, the solenoid valve is controlled by the control system, and the solenoid valve is used for periodically and alternately inputting balance air pressure gas or high balance air pressure gas into the balance air cylinder when the bobbin is wound in an overlapping area, so that the accurate control of the variable bobbin contact pressure is realized, the anti-overlapping effect of the bobbin is improved, and the bobbin quality is improved.

Description

Technical Field

[0001] This invention belongs to the field of textile machinery manufacturing technology, and relates to the technical improvement of automatic winding machines, specifically a yarn contact pressure control system and control method. Background Technology

[0002] In the textile industry, the contact pressure between the yarn package and the winding drum of an automatic winding machine has a significant impact on the quality of the yarn package. The contact pressure directly affects the anti-overlapping properties of the yarn package and determines its unwinding performance. Therefore, achieving precise and variable control of the contact pressure during the winding process is crucial for improving yarn quality. Currently, the contact pressure of existing automatic winding machines either cannot be variablely controlled during the winding process or uses mechanical variable control, which leads to shortened component lifespan. In existing winding machines, after the balancing air pressure is set, the contact pressure remains constant during the winding process. Anti-overlapping in the overlapping area relies solely on electronic anti-overlap speed differences, resulting in unsatisfactory anti-overlapping performance.

[0003] Chinese Patent (Publication No.: CN112061886A) discloses a yarn contact pressure balancing device. This device provides yarn contact pressure through the interaction of a tension spring and a balancing cylinder. However, once the input air pressure of the balancing cylinder is set, the yarn contact pressure cannot be variablely controlled during the winding process. Chinese Patent (Publication No.: CN101798034B) discloses a winding anti-overlap control method and device for a winding machine. When the winding machine is in the overlapping winding zone, in addition to changing the rotation speed of the grooved cylinder, the contact pressure between the yarn and the grooved cylinder is also changed. This is achieved by repeatedly and rapidly lifting the yarn cradle, meaning the balancing cylinder repeatedly and rapidly performs reciprocating motions. Therefore, the service life of the cylinder cone sleeve is greatly reduced. Most existing automatic winding machines use electronic anti-overlapping to prevent overlapping winding, which is achieved by using the speed difference of the grooved drum. Chinese patent (publication number: CN101481054A) discloses an anti-overlapping method using an electronic anti-overlapping auxiliary grooved drum, which achieves the purpose of anti-overlapping by changing the number of turns of the grooved drum during electronic anti-overlapping. The disadvantage of this method is that when the number of turns of the grooved drum changes, the winding density of the yarn changes, and the end face of the yarn is not aesthetically pleasing.

[0004] How to design a yarn contact pressure control system and method that can achieve variable and precise control of the contact pressure in the overlapping area of ​​the yarn during the winding process, improve the anti-overlapping effect of the yarn in the overlapping area, reduce the damage to the yarn when the yarn rubs against the grooved cylinder at high speed, obtain better yarn forming quality, and not affect the service life of the balance cylinder cone sleeve is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this invention provides a yarn contact pressure control system and method. During the winding process, the contact pressure in the overlapping area of ​​the yarn packages can be precisely controlled, improving the anti-overlapping effect of the yarn packages in the overlapping area, reducing yarn damage during high-speed friction between the yarn packages and the grooved cylinder, obtaining better yarn package forming quality, and without affecting the service life of the balance cylinder cone sleeve.

[0006] The objective of this invention is achieved through the following technical solution: A yarn bobbin contact pressure control system includes a machine head, a compressed air channel for the winding machine, a single spindle of the winding machine, and a control system. The single spindle of the winding machine includes a grooved drum, a grooved drum transmission mechanism, a yarn bobbin pressurizing mechanism, and connecting pipes. The yarn bobbin pressurizing mechanism includes a yarn bobbin oscillator, a balance cylinder, a tension spring, and a oscillating assembly for the yarn bobbin oscillator. The compressed air channel of the winding machine is connected to an external compressed air source. Each of the balance cylinders is connected to the compressed air channel of the winding machine through the connecting pipes. The control system controls the rotational speed of the grooved drum through the grooved drum transmission mechanism to prevent yarn bobbin overlap. The compressed air channel of the winding machine includes at least two air paths, one of which is connected to a pressure regulator. One valve serves as the low-balance air pressure path, while another is connected to a pressure regulating valve as the high-balance air pressure path. Each balancing cylinder is equipped with a solenoid valve, which includes at least two air inlets, one air outlet, and one exhaust port. The two air inlets are connected to the low-balance air pressure path and the high-balance air pressure path respectively through the connecting pipes. The exhaust port is connected to the air inlet of the balancing cylinder. Both the pressure regulating valve and the solenoid valve are controlled by the control system. They are used to periodically and alternately input low-balance air pressure gas or high-balance air pressure gas into the balancing cylinder when the yarn is wound in the overlapping area, so as to achieve precise control of the variable contact pressure of the yarn, improve the anti-overlapping effect of the yarn, and improve the quality of the yarn.

[0007] Improvements to the above technical solution: The low-balance air pressure circuit and the high-balance air pressure circuit are both metal pipes installed in the whole machine. The two air inlets of each solenoid valve are connected to the two metal pipes through flexible air tubes. The air inlet of the balance cylinder is connected to the air outlet of the corresponding solenoid valve through a flexible air tube.

[0008] Further improvements to the above technical solution: The single spindle of the winding machine also includes a yarn feeder, a bobbin suction nozzle, a bobbin suction nozzle, a tension plate, a twister, and an electronic yarn clearer. The bobbin oscillating frame assembly includes a tension spring gear, a cylinder gear, and a swing arm that rotate on the frame. One end of the tension spring is fixed to the frame, and the other end is fixed to the swing arm. The extension rod of the balance cylinder is connected to the rotating shaft of the cylinder gear.

[0009] Further improvements to the above technical solution: An external compressed air source is connected to the machine head and the compressed air channel of the winding machine. The compressed air channel of the winding machine is divided into four air paths and arranged in the machine. One path is a splicing air path with a pressure regulating valve, which is used to supply air to the splicers in each single spindle of the winding machine. Another path is a single spindle air path that does not require pressure regulation and is directly connected to the single spindle of the winding machine. The other two paths are the low-balance air pressure path and the high-balance air pressure path.

[0010] Further improvements to the above technical solution: the pressure of the external compressed air source is at least 10 bar, the pressure of the high-balance air pressure path is greater than the pressure of the low-balance air pressure path, the pressure of the high-balance air pressure path is 1.5-2.0 bar, and the pressure of the low-balance air pressure path is 0.5-1.0 bar.

[0011] A control method for the above-mentioned yarn bobbin contact pressure control system, characterized in that the control method includes the following steps: Step 1: After the preparation work of winding the bobbin on the single spindle of the winding machine is completed, the control system controls the grooved drum to start high-speed winding. When high-speed winding is carried out in the non-overlapping area of ​​the bobbin, the solenoid valve is in the zero position. The solenoid valve has only one air inlet connected to the low balance air pressure air circuit, continuously inputting low balance gas into the balance cylinder, and operating at a higher bobbin contact pressure. Step 2: When the diameter of the yarn package reaches a specific value and enters the yarn package overlap area, the control system controls the solenoid valve to perform periodic actions, causing the two air inlets of the solenoid valve to alternately open and close to connect the high balance air pressure path or the low balance air pressure path. The high balance gas or the low balance gas is alternately input into the balance cylinder, causing the air pressure in the balance cylinder to change periodically. Throughout the entire yarn package overlap area, the control system controls the yarn package winding speed to change periodically, and the yarn package contact pressure makes the same periodic changes. Step 3: After passing through the overlap zone and entering the non-overlap zone, the control system controls the solenoid valve to return to the zero position and operates according to the control method of Step 1; when the diameter of the yarn package reaches a specific value again and enters the overlap zone, it operates according to the control method of Step 2; the control method is repeated until the yarn package winding is completed.

[0012] Improvements to the above technical solution: In step 2, the period of change in the contact pressure of the yarn package is consistent with the anti-overlapping period of the yarn package, and the time of the yarn package acceleration phase is less than the time of the yarn package deceleration phase; during the yarn package acceleration phase, the solenoid valve is connected to the high balance air pressure circuit, and the contact pressure between the yarn package and the grooved cylinder is reduced, which facilitates the yarn package sliding and anti-overlapping; during the yarn package deceleration phase, the solenoid valve is connected to the low balance air pressure circuit, and the contact pressure between the yarn package and the grooved cylinder is increased, which facilitates the deceleration following performance of the yarn package and the grooved cylinder.

[0013] Further improvements to the above technical solution: In step 2, the period of change of contact pressure of the yarn package and the anti-overlapping period of the yarn package are both 1.2-2.0 seconds, the time of the yarn package acceleration phase is 0.3-0.6 seconds, and the time of the yarn package deceleration phase is 0.9-1.4 seconds.

[0014] The advantages and positive effects of this invention are: 1. This invention enables precise, convenient, and variable control of balanced air pressure in both overlapping and non-overlapping areas of the yarn package.

[0015] 2. This invention can improve the anti-overlapping effect of the yarn in the overlapping area, reduce yarn friction damage, and improve the quality of yarn forming.

[0016] 3. This invention uses dual-path balanced air pressure, which can effectively balance the quality of yarn forming and the size of the yarn package at the same time.

[0017] 4. This invention improves the service life of existing mechanical parts.

[0018] In summary, this invention designs an electrified system with precise and real-time variable contact pressure of yarn bobbins, realizing contact pressure control in the overlapping area of ​​yarn bobbins, ensuring the service life of mechanical parts, ensuring that the bobbin diameter meets packaging requirements, achieving non-overlapping winding and unwinding of yarn bobbins, reducing unwinding and breakage caused by yarn wear, and improving the production efficiency and quality of the next process. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a yarn contact pressure control system according to the present invention. Figure 2 This is a schematic diagram of the operation of a single spindle in a yarn bobbin contact pressure control system according to the present invention; Figure 3 This is a schematic diagram of the overall layout of a yarn contact pressure control system according to the present invention. Figure 4 This is a flowchart of a control method for a yarn contact pressure control system according to the present invention.

[0020] The components in the diagram are numbered as follows: 1. Flexible air tube; 2. Solenoid valve; 3. Tension spring; 4. Tension spring gear; 5. Balance cylinder; 6. Cylinder gear; 7. Yarn bobbin cradle; 8. Large end wheel; 9. Small end wheel; 10. Yarn bobbin; 11. Grooved bobbin; 12. Frame; 13. Yarn clearer; 14. Splicer; 15. Yarn bobbin suction nozzle; 16. Tension disc; 17. Yarn tube suction nozzle; 18. Yarn guide; 19. Yarn tube; 20. Winding machine spindle; 21. Machine head; 22. Pressure regulating valve; 23. Low balance air pressure circuit; 24. High balance air pressure circuit; 25. Splicing air circuit; 26. Single spindle air circuit. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings: See Figures 1-3 An embodiment of a yarn bobbin contact pressure control system of the present invention includes a machine head 21, a compressed air channel for the winding machine, a single spindle 20 for the winding machine, and a control system. The single spindle 20 for the winding machine includes a grooved cylinder 11, a grooved cylinder transmission mechanism, a yarn bobbin pressurizing mechanism, and connecting pipelines. The yarn bobbin pressurizing mechanism includes a yarn bobbin oscillator 7, a balancing cylinder 5, a tension spring 3, and a yarn bobbin oscillator swing assembly. The compressed air channel for the winding machine is connected to an external compressed air source. Each balancing cylinder 5 is connected to the compressed air channel for the winding machine through the connecting pipelines. The control system controls the rotational speed of the grooved cylinder through the grooved cylinder transmission mechanism to prevent yarn bobbin overlap. The compressed air channel for the winding machine includes at least two air paths, one of which is connected to a pressure regulating valve 22 as a low-balance air pressure path 23, and the other of which is connected to a pressure regulating valve 22 as a high-balance air pressure path 24. Each balancing cylinder 5 is equipped with a solenoid valve 2. The solenoid valve 2 includes at least two air inlets, one air outlet, and one exhaust port. The two air inlets are connected to the low-balance air pressure passage 23 and the high-balance air pressure passage 24 respectively through the connecting pipes. The exhaust port is connected to the air inlet of the balancing cylinder 5. Both the pressure regulating valve 22 and the solenoid valve 2 are controlled by the control system. They are used to periodically and alternately input low-balance air pressure gas or high-balance air pressure gas into the balancing cylinder 5 when the yarn package 10 is wound in the overlapping area. This achieves precise control of the variable contact pressure of the yarn package 10, improving the anti-overlapping effect and quality of the yarn package 10.

[0022] Furthermore, the aforementioned low-balance air pressure passage 23 and high-balance air pressure passage 24 are both metal pipes installed in the whole machine. The two air inlets of each solenoid valve 2 are respectively connected to the two metal pipes through flexible air pipes 1. The air inlet of the balance cylinder 5 is connected to the air outlet of the corresponding solenoid valve 2 through flexible air pipes 1.

[0023] Furthermore, the aforementioned single spindle 20 of the winding machine also includes a yarn feeder 18, a bobbin suction nozzle 17, a bobbin suction nozzle 15, a tension plate 16, a splicer 14, and an electronic yarn clearer 13. The bobbin oscillating frame assembly includes a tension spring gear 4, a cylinder gear 6, and a swing arm that rotate on the frame 12. One end of the tension spring 3 is fixed to the frame 12, and the other end is fixed to the swing arm. The extension rod of the balance cylinder 5 is connected to the rotating shaft of the cylinder gear 6.

[0024] Specifically: An external compressed air source is connected to the machine head 21 of the whole machine and the compressed air channel of the winding machine. The compressed air channel of the winding machine is divided into four air paths and arranged in the whole machine. One of them is the splicing air path 25 connected to the pressure regulating valve 22, which is used to supply air to the splicer 14 in each single spindle 20 of the winding machine. Another path is the single spindle air path 26 that does not require pressure regulation and is directly connected to the single spindle 20 of the winding machine. The other two paths are the low balance air pressure path 23 and the high balance air pressure path 24.

[0025] Preferably, the pressure of the external compressed air source is at least 10 bar, the pressure of the high balance pressure air passage 24 is greater than the pressure of the low balance pressure air passage 23, the pressure of the high balance pressure air passage 24 is 1.5-2.0 bar, and the pressure of the low balance pressure air passage 23 is 0.5-1.0 bar.

[0026] like Figure 1 As shown, the yarn package 10 is fixed to the yarn package cradle 7 by the large end wheel 8 and the small end wheel 9. The contact pressure between the yarn package 10 and the grooved cylinder 11 is determined by the tension spring 3 and the balance cylinder 5. The tension spring 3 pulls downward with a fixed tension force, causing the tension spring gear 4 to rotate clockwise. The cylinder gear 6, which meshes with the tension spring gear 4, rotates counterclockwise. At this time, the yarn package cradle 7 is pressed down by the tension force generated by the tension spring 3, and the contact pressure between the yarn package 10, which is sandwiched between the large end wheel 8 and the small end wheel 9, and the grooved cylinder 11 increases. When the balance cylinder 5 is connected to air pressure, the balance cylinder 5 is lifted upward by the air pressure, causing the cylinder gear 6 to rotate clockwise, which is opposite to the counterclockwise rotation of the cylinder gear 6 caused by the tension force of the tension spring 3. This reduces the downward pressure on the yarn package cradle 7, thereby achieving the purpose of controlling the contact pressure of the yarn package. The existing structure involves a single compressed air line connected to the balancing cylinder 5 via a flexible air tube. Once the compressed air pressure is set, it remains constant during equipment operation, meaning the contact pressure between the yarn package 10 and the grooved cylinder 11 remains essentially unchanged throughout the entire production process. This invention, however, uses a solenoid valve 2 to connect the low-pressure balancing air path 23 and the high-pressure balancing air path 24 (with a pressure difference) to the balancing cylinder 5. The control system then controls the solenoid valve 2 to open and close within a specific diameter range of the yarn package 10, achieving precise and rapid control of the contact pressure of the yarn package 10.

[0027] like Figure 2 As shown in the single spindle 20 of the winding machine, after the bobbin 19 enters the single spindle 20 of the winding machine, the yarn head passes through the yarn guide 18, and the yarn head is captured by the bobbin suction nozzle 17. The bobbin suction nozzle 15 captures the yarn head on the bobbin 10 and pulls it downward, placing it into the slot of the electronic yarn clearer 13 and the slot of the splicer 14. The bobbin suction nozzle 17 pulls the bobbin 19 yarn into the slot of the tension plate 16 and the splicer 14, completing the yarn knotting. The slotted drum 11 starts to start high-speed winding.

[0028] Working principle of the invention: like Figure 1As shown, the yarn package 10 is fixed to the yarn package cradle 7 by the large end wheel 8 and the small end wheel 9. The contact pressure between the yarn package 10 and the grooved cylinder 11 is determined by the tension spring 3 and the balance cylinder 5. The tension spring 3 pulls downward with a fixed tension force, causing the tension spring gear 4 to rotate clockwise. The cylinder gear 6, which meshes with the tension spring gear 4, rotates counterclockwise. At this time, the yarn package cradle 7 is pressed down by the tension force generated by the tension spring 3, and the contact pressure between the yarn package 10, which is sandwiched between the large end wheel 8 and the small end wheel 9, and the grooved cylinder 11 increases. When the balance cylinder 5 is connected to air pressure, the balance cylinder 5 is lifted upward by the air pressure, causing the cylinder gear 6 to rotate clockwise, which is opposite to the counterclockwise rotation of the cylinder gear 6 caused by the tension force of the tension spring 3. This reduces the downward pressure on the yarn package cradle 7, thereby achieving the purpose of controlling the contact pressure of the yarn package. The existing technology involves a single compressed air supply line that is connected to the balance cylinder 5 via a flexible air tube. Once the compressed air pressure is set, it remains constant during the operation of the equipment, meaning that the contact pressure between the yarn package 10 and the grooved cylinder 11 remains essentially constant throughout the entire production process.

[0029] This invention uses a solenoid valve 2 with two air inlets to connect a low-pressure balance air path 23 and a high-pressure balance air path 24 with a pressure difference to a balancing cylinder 5. When the solenoid valve 2 is activated, it periodically connects either the low-pressure balance air path 23 or the high-pressure balance air path 24 individually. The tension provided by the tension spring 3 is constant. When low-pressure compressed air is supplied by the low-pressure balance air path 23, the balancing cylinder 5 moves downward, driving the cylinder gear 6 to rotate counterclockwise. This causes the yarn bobbin cradle 7 to have a downward pressing tendency, increasing the contact pressure between the yarn bobbin 10 and the grooved cylinder 11. When high-pressure compressed air is supplied, the balancing cylinder 5 moves upward, driving the cylinder gear 6 to rotate clockwise. This causes the yarn bobbin cradle 7 to have a lifting tendency, decreasing the contact pressure between the yarn bobbin 10 and the grooved cylinder 11.

[0030] like Figure 2 As shown, when the diameter of the yarn package 10 is outside the overlapping area (non-overlapping area), the balancing cylinder 5 of the single spindle 20 is connected to the low-balance air pressure path 23. When the diameter of the yarn package 10 reaches one or two times the diameter of the grooved cylinder 11, the overlapping area of ​​the yarn package 10 is reached, and the electronic anti-overlap mechanism starts to control the grooved cylinder 11 to periodically accelerate and decelerate to prevent overlapping winding. At this time, the control system controls the solenoid valve 2 to perform opening and closing actions according to a certain cycle, the cycle being consistent with the anti-overlap cycle. Therefore, during the acceleration phase of the grooved cylinder 11 in the electronic anti-overlap process, the balancing cylinder 5 is connected to the high-balance air pressure path 24, increasing the support force on the yarn package cradle 7 and decreasing the contact pressure of the yarn package 10. During the deceleration phase of the grooved cylinder 11 in the electronic anti-overlap process, the balancing cylinder 5 is connected to the low-balance air pressure path 23, decreasing the support force on the yarn package cradle 7 and increasing the contact pressure of the yarn package 10. Throughout the entire overlapping area of ​​the yarn package, the winding speed of the yarn package 10 changes periodically, and the contact pressure of the yarn package 10 changes periodically in the same way.

[0031] like Figure 3As shown, the low-balance air pressure path 23 and the high-balance air pressure path 24 can be adjusted according to the actual situation. Within a certain range, the greater the pressure difference between the two (the lower the air pressure of the low-balance air pressure path 23 and the higher the air pressure of the high-balance air pressure path 24), the greater the change in the contact pressure of the yarn package 10 in the overlapping area. This is more conducive to the slippage between the yarn package 10 and the grooved cylinder 11 during the acceleration phase and the better the following performance between the yarn package 10 and the grooved cylinder 11 during the deceleration phase. At the same time, the periodic change in the contact pressure of the yarn package 10 helps to reduce the damage to the yarn tube 19 caused by high-speed friction between the yarn package 10 and the grooved cylinder 11. On the other hand, the higher the contact pressure of the yarn package 10, the smaller the diameter of the yarn package 10, and vice versa. From the perspective of packaging the yarn package 10, a smaller diameter of the yarn package 10 is more advantageous. This invention does not use a high-pressure air path (low contact pressure) throughout the entire process, but only uses alternating high and low contact pressure in the overlapping area, while the non-overlapping area still operates with high contact pressure. Therefore, the size of the yarn package 10 is well controlled and is consistent with the size of the yarn package under the prior art.

[0032] Instructions for specific use of this invention: 1. The anti-overlap cycle (opening and closing cycle of solenoid valve 2) is 1.2s-2.0s, of which the acceleration phase accounts for 20%-30%.

[0033] 2. A larger pressure differential can be used when producing chemical fiber or chemical fiber blended yarn, while a smaller pressure differential can be used when producing cotton yarn.

[0034] 3. The overlapping area of ​​the yarn package generally refers to the area near the diameter of the yarn package 10 when it is one or two times the diameter of the grooved yarn package 11. The other diameter range of the yarn package 10 is the non-overlapping area.

[0035] 4. The external compressed air level must be at least 10 bar.

[0036] 5. The range of the pressure regulating valve 22 used to adjust the low balance air pressure line 23 and the high balance air pressure line 24 should be 0-4 bar.

[0037] 6. The range of the pressure regulating valve used to adjust the splicing air passage 25 should be 0-10 bar.

[0038] 7. Single-spindle gas path 26 supplies gas to a single ingot, requiring no additional pressure adjustment.

[0039] 8. The number of single spindles in an automatic winding machine is generally 60, 64, or 72, etc.

[0040] 9. Taking 30-count chemical fiber yarn as an example, after using the yarn contact pressure control system of the present invention, the proportion of defective yarn is less than 0.3%.

[0041] See Figures 1-4An embodiment of the control method for the above-mentioned yarn contact pressure control system of the present invention is characterized in that the control method includes the following steps: Step 1: After the preparation work for winding the bobbin 19 onto the single spindle 20 of the winding machine is completed, the control system controls the grooved drum 11 to start high-speed winding. When high-speed winding is performed in the non-overlapping area of ​​the bobbin 10, the solenoid valve 2 is in the zero position. The solenoid valve 2 has only one air inlet connected to the low balance air pressure air passage 23, continuously inputting low balance gas into the balance cylinder 5, so as to operate at a higher contact pressure of the bobbin 10. Step 2: When the diameter of the yarn package 10 reaches a specific value (around one or two times the diameter of the grooved cylinder 11), after entering the overlap area of ​​the yarn package 10, the control system controls the solenoid valve 2 to perform periodic actions, causing the two air inlets of the solenoid valve 2 to alternately open and close to connect the high balance air pressure passage 24 or the low balance air pressure passage 23. The high balance gas or low balance gas is alternately input into the balance cylinder 5, causing the air pressure in the balance cylinder 5 to change periodically. In the entire overlap area of ​​the yarn package 10, the control system controls the winding speed of the yarn package 10 to change periodically, and the contact pressure of the yarn package 10 makes the same periodic change. Step 3: After passing through the overlapping area of ​​the yarn package 10 and entering the non-overlapping area of ​​the yarn package 10, the control system controls the solenoid valve 2 to return to the zero position and operates according to the control method of Step 1; when the diameter of the yarn package 10 reaches a specific value again (nearly when the diameter of the yarn package 10 is one or two times the diameter of the grooved cylinder 11), and enters the overlapping area of ​​the yarn package 10 again, it operates according to the control method of Step 2; the above control method is repeated until the yarn package 10 is wound completely.

[0042] Furthermore, in step 2 above, the period of change in the contact pressure of the yarn package 10 is consistent with the anti-overlapping period of the yarn package 10, and the acceleration phase time of the yarn package 10 is shorter than the deceleration phase time of the yarn package 10; during the acceleration phase of the yarn package 10, the solenoid valve 2 connects to the high balance air pressure circuit 24, and the contact pressure between the yarn package 10 and the grooved cylinder 11 decreases, which facilitates the slippage and anti-overlapping of the yarn package 10; during the deceleration phase of the yarn package 10, the solenoid valve 2 connects to the low balance air pressure circuit 23, and the contact pressure between the yarn package 10 and the grooved cylinder 11 increases, which facilitates the deceleration following performance of the yarn package 10 and the grooved cylinder 11.

[0043] Preferably, in step 2 above, the period of the change in contact pressure of the yarn package 10 and the anti-overlapping period of the yarn package 10 are both 1.2-2.0 seconds, the acceleration phase of the yarn package 10 is 0.3-0.6 seconds, and the deceleration phase of the yarn package 10 is 0.9-1.4 seconds.

[0044] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A yarn contact pressure control system, comprising a winding machine head, a winding machine compressed air channel, a single spindle of the winding machine, and a control system, wherein the single spindle of the winding machine includes a grooved drum, a grooved drum transmission mechanism, a yarn pressing mechanism, and connecting pipelines; the yarn pressing mechanism includes a yarn cradle, a balance cylinder, a tension spring, and a yarn cradle swing assembly; the winding machine compressed air channel is connected to an external compressed air source; each of the balance cylinders is connected to the winding machine compressed air channel through the connecting pipelines; the control system controls the rotational speed of the grooved drum through the grooved drum transmission mechanism to prevent yarn overlap, characterized in that... The compressed air channel of the winding machine includes at least two air paths. One path is connected to a pressure regulating valve as a low-balance air path, and the other path is connected to a pressure regulating valve as a high-balance air path. Each balancing cylinder is equipped with a solenoid valve. The solenoid valve includes at least two air inlets, one air outlet, and one exhaust port. The two air inlets are connected to the low-balance air path and the high-balance air path respectively through the connecting pipes. The exhaust port is connected to the air inlet of the balancing cylinder. The pressure regulating valve and the solenoid valve are both controlled by the control system. They are used to periodically and alternately input low-balance air or high-balance air into the balancing cylinder when the yarn is wound in the overlapping area, so as to achieve precise control of the variable contact pressure of the yarn, improve the anti-overlapping effect of the yarn and the quality of the yarn.

2. The yarn bobbin contact pressure control system according to claim 1, characterized in that, Both the low-balance air pressure circuit and the high-balance air pressure circuit are metal pipes installed in the whole machine. The two air inlets of each solenoid valve are connected to the two metal pipes through flexible air tubes. The air inlet of the balance cylinder is connected to the air outlet of the corresponding solenoid valve through a flexible air tube.

3. The yarn bobbin contact pressure control system according to claim 1 or 2, characterized in that, The single spindle of the winding machine also includes a yarn feeder, a bobbin suction nozzle, a bobbin suction nozzle, a tension plate, a twister, and an electronic yarn clearer. The bobbin oscillating frame assembly includes a tension spring gear, a cylinder gear, and a swing arm that rotate on the frame. One end of the tension spring is fixed to the frame, and the other end is fixed to the swing arm. The telescopic rod of the balance cylinder is connected to the rotating shaft of the cylinder gear.

4. The yarn bobbin contact pressure control system according to claim 3, characterized in that, An external compressed air source is connected to the machine head and the compressed air channel of the winding machine. The compressed air channel of the winding machine is divided into four air paths and arranged in the machine. One path is a splicing air path with a pressure regulating valve, which is used to supply air to the splicers in each winding machine spindle. Another path is a single-spindle air path that does not require pressure regulation and is directly connected to the single-spindle of the winding machine. The other two paths are the low-balance air path and the high-balance air path.

5. The yarn bobbin contact pressure control system according to claim 1 or 2, characterized in that, The external compressed air source has a pressure of at least 10 bar, the pressure of the high-balance air pressure path is greater than the pressure of the low-balance air pressure path, the pressure of the high-balance air pressure path is 1.5-2.0 bar, and the pressure of the low-balance air pressure path is 0.5-1.0 bar.

6. The yarn bobbin contact pressure control system according to claim 3, characterized in that, The external compressed air source has a pressure of at least 10 bar, the pressure of the high-balance air pressure path is greater than the pressure of the low-balance air pressure path, the pressure of the high-balance air pressure path is 1.5-2.0 bar, and the pressure of the low-balance air pressure path is 0.5-1.0 bar.

7. The yarn bobbin contact pressure control system according to claim 4, characterized in that, The external compressed air source has a pressure of at least 10 bar, the pressure of the high-balance air pressure path is greater than the pressure of the low-balance air pressure path, the pressure of the high-balance air pressure path is 1.5-2.0 bar, and the pressure of the low-balance air pressure path is 0.5-1.0 bar.

8. A control method for a yarn bobbin contact pressure control system as described in any one of claims 1-7, characterized in that, The control method includes the following steps: Step 1: After the preparation work of winding the bobbin on the single spindle of the winding machine is completed, the control system controls the grooved drum to start high-speed winding. When high-speed winding is carried out in the non-overlapping area of ​​the bobbin, the solenoid valve is in the zero position. The solenoid valve has only one air inlet connected to the low balance air pressure air circuit, continuously inputting low balance gas into the balance cylinder, and operating at a higher bobbin contact pressure. Step 2: When the diameter of the yarn package reaches a specific value and enters the yarn package overlap area, the control system controls the solenoid valve to perform periodic actions, causing the two air inlets of the solenoid valve to alternately open and close to connect the high balance air pressure path or the low balance air pressure path. The high balance gas or the low balance gas is alternately input into the balance cylinder, causing the air pressure in the balance cylinder to change periodically. Throughout the entire yarn package overlap area, the control system controls the yarn package winding speed to change periodically, and the yarn package contact pressure makes the same periodic changes. Step 3: After passing through the overlap zone and entering the non-overlap zone, the control system controls the solenoid valve to return to the zero position and operates according to the control method of Step 1; when the diameter of the yarn package reaches a specific value again and enters the overlap zone, it operates according to the control method of Step 2; the control method is repeated until the yarn package winding is completed.

9. The control method of the yarn bobbin contact pressure control system according to claim 8, characterized in that, In step 2, the period of change in the contact pressure of the yarn package is consistent with the anti-overlapping period of the yarn package, and the time of the yarn package acceleration phase is shorter than the time of the yarn package deceleration phase. During the yarn package acceleration phase, the solenoid valve is connected to the high balance air pressure circuit, and the contact pressure between the yarn package and the grooved cylinder is reduced, which facilitates the yarn package sliding and anti-overlapping. During the yarn package deceleration phase, the solenoid valve is connected to the low balance air pressure circuit, and the contact pressure between the yarn package and the grooved cylinder is increased, which facilitates the deceleration following of the yarn package and the grooved cylinder.

10. The control method of the yarn bobbin contact pressure control system according to claim 9, characterized in that, In step 2, the period of change of contact pressure of the yarn package and the anti-overlapping period of the yarn package are both 1.2-2.0 seconds, the time of the yarn package acceleration phase is 0.3-0.6 seconds, and the time of the yarn package deceleration phase is 0.9-1.4 seconds.

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