Cone yarn contact pressure control system and control method

Abstract

The invention provides a cone yarn contact pressure control system and method.The cone yarn contact pressure control system comprises a complete machine head, a cone machine compressed air channel, a cone machine single spindle and a control system, the cone machine single spindle comprises a groove drum, a groove drum transmission mechanism and a cone yarn pressurization mechanism, and the cone yarn pressurization mechanism comprises a cone yarn cradle, a balance air cylinder, a tension spring and a cone yarn cradle swing assembly; the device is characterized in that a compressed air channel of the winding machine comprises a low-balance air pressure air channel and a high-balance air pressure air channel, an electromagnetic valve arranged on each balance air cylinder comprises two air inlets and an air outlet, and the two air inlets are respectively communicated with the low-balance air pressure air channel and the high-balance air pressure air channel through connecting pipelines. The air outlet is communicated with an air inlet of the balance cylinder. The electromagnetic valve is controlled by a control system and used for periodically and alternately inputting balanced air pressure gas or high-balanced air pressure gas into the balanced air cylinder when the cone yarn is wound in an overlapping area, variable accurate control over the cone yarn contact pressure is achieved, and the cone yarn anti-overlapping effect and the cone yarn quality are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of textile machinery manufacturing, and relates to the technical improvement of an automatic winding machine, in particular to a bobbin yarn contact pressure control system and a control method. Background Art

[0002] In the textile field, the contact pressure between the bobbin yarn and the grooved drum of the automatic winding machine has an important influence on the quality of the bobbin yarn. The bobbin yarn contact pressure has a direct impact on the anti-overlapping of the bobbin yarn and determines the unwinding performance of the bobbin yarn. Therefore, achieving accurate and variable control of the bobbin yarn contact pressure during the winding process has a positive effect on improving the quality of the bobbin yarn. The bobbin yarn contact pressure of existing automatic winding machines is either unable to be variably controlled during the winding process, or mechanical variable control is adopted, but there is a problem of shortened component life. After the existing winder balance air pressure is set, the bobbin yarn contact pressure no longer changes during the winding process, and the anti-overlapping winding is only carried out by the electronic anti-overlapping speed difference in the overlapping area, and the anti-overlapping effect of the bobbin yarn is not ideal.

[0003] A Chinese patent (publication number: CN112061886A) discloses a bobbin contact pressure balancing device, which provides bobbin contact pressure through the interaction of a tension spring and a balancing cylinder. After the input air pressure of the balancing cylinder is set, the bobbin contact pressure cannot be variably controlled during the winding process. A Chinese patent (publication number: CN101798034B) discloses a winding anti-overlapping control method and device for a bobbin winder. When the bobbin winder is in the overlapping winding interval, in addition to changing the rotation speed of the grooved drum, the contact pressure between the bobbin and the grooved drum is also changed. This is achieved by repeatedly and quickly lifting the bobbin cradle, which means that the balancing cylinder repeatedly and quickly reciprocates, and 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 groove drum to accelerate and decelerate. A Chinese patent (publication number: CN101481054A) discloses an anti-overlapping method of the groove drum with electronic anti-overlapping assistance, that is, the change in the number of groove drum turns is used to achieve the purpose of anti-overlapping during electronic anti-overlapping. The disadvantage of this method is that when the number of groove drum turns changes, the winding density of the yarn changes, and the end surface of the yarn is not beautiful.

[0004] How to design a bobbin yarn contact pressure control system and control method, in which, during the winding process, the contact pressure of the bobbin yarn overlapping area can be variably and accurately controlled, thereby improving the anti-overlapping effect of the bobbin yarn in the overlapping area, reducing the damage to the yarn during high-speed friction between the bobbin yarn and the grooved drum, and obtaining better bobbin yarn forming quality without affecting the service life of the balancing cylinder cone sleeve. This is a technical problem that needs to be urgently solved in this field. Summary of the invention

[0005] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a bobbin yarn contact pressure control system and a control method. During the winding process, the contact pressure of the bobbin yarn overlapping area can be variably and accurately controlled, thereby improving the anti-overlapping effect of the bobbin yarn in the overlapping area, reducing the damage to the yarn during high-speed friction between the bobbin yarn and the grooved drum, and obtaining better bobbin yarn forming quality without affecting the service life of the balancing cylinder cone sleeve.

[0006] The objective of the present invention is achieved through the following technical solutions: A bobbin yarn contact pressure control system, comprising a complete machine head, a compressed air channel of a winding machine, a single spindle of the winding machine and a control system, wherein the single spindle of the winding machine comprises a grooved drum, a grooved drum transmission mechanism, a bobbin yarn pressurizing mechanism and a connecting pipeline, the bobbin yarn pressurizing mechanism comprises a bobbin yarn cradle, a balancing cylinder, a tension spring and a bobbin yarn cradle swinging assembly, the compressed air channel of the winding machine is connected to an external compressed air source, and each of the balancing cylinders is connected to the compressed air channel of the winding machine through the connecting pipeline, the control system controls the rotation speed of the grooved drum through the grooved drum transmission mechanism to prevent the bobbin yarn from overlapping, and is characterized in that the compressed air channel of the winding machine comprises at least two air paths, one of which is connected to a regulating The first control panel controls the movement of the air in the cylinder to control the speed of the air flow, and the second control panel controls the movement of the air in the cylinder to control the speed of the air flow. The control panel controls the movement of the air in the cylinder to control the speed of the air flow. The control panel controls the movement of the air in the cylinder to control the speed of the air flow.

[0007] Improvement on the above technical solution: the low-balanced air pressure air circuit and the high-balanced air pressure air circuit are both metal pipes laid in the whole machine, the two air inlets of each solenoid valve are connected to the two metal pipes through a soft air pipe respectively, and the air inlet of the balancing cylinder is connected to the air outlet of the corresponding solenoid valve through a soft air pipe.

[0008] Further improvement of the above technical solution: the single spindle of the winding machine also includes a yarn guide, a tube yarn suction nozzle, a cone yarn suction nozzle, a tension disk, a splicer and an electronic yarn clearer, and the cone yarn cradle swing assembly includes a tension spring gear, a cylinder gear and a swing arm that are arranged to 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, and the telescopic rod of the balancing cylinder is connected to the rotating shaft of the cylinder gear.

[0009] Further improvement of the above technical solution: an external compressed air source is connected to the head of the whole machine and connected to 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, wherein one path is a splicing air path connected to a pressure regulating valve, which is used to supply air to the splicer in each single spindle of the winding machine, another path is a single spindle air path that is directly connected to the single spindle of the winding machine without pressure regulation, and the remaining two paths are the low balanced air pressure air path and the high balanced air pressure air path.

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

[0011] A control method for the above-mentioned package yarn contact pressure control system is characterized in that the control method comprises 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 groove drum to start high-speed winding. When high-speed winding is performed in the non-overlapping area of ​​the bobbin, the solenoid valve is in zero position, and the solenoid valve has only one air inlet connected to the low-balance air pressure air path, and continuously inputs low-balance gas to the balance cylinder to operate at a higher bobbin contact pressure; Step 2: When the diameter of the bobbin reaches a specific value and enters the bobbin overlapping area, the control system controls the solenoid valve to perform periodic action, so that the two air inlets of the solenoid valve are alternately opened and closed to connect the high balance air pressure air path or the low balance air pressure air path, and high balance gas or low balance gas is alternately input into the balance cylinder to make the air pressure in the balance cylinder change periodically. In the entire bobbin overlapping area, the control system controls the bobbin winding speed to change periodically, and the bobbin contact pressure makes the same periodic change; Step 3: After passing the yarn overlap zone and entering the yarn non-overlap zone, the control system controls the solenoid valve to return to zero position and operates according to the control method of step 1; when the yarn diameter reaches a specific value again and enters the yarn overlap zone, it operates according to the control method of step 2; the control method is cyclically operated until the yarn winding is completed.

[0012] Improvements to the above technical solution: in the step 2, the cycle of the change in the contact pressure of the bobbin yarn is consistent with the anti-overlapping cycle of the bobbin yarn, and the acceleration stage time of the bobbin yarn is less than the deceleration stage time of the bobbin yarn; during the acceleration stage of the bobbin yarn, the solenoid valve is connected to the high-balance air pressure air circuit, and the contact pressure between the bobbin yarn and the groove drum is reduced, which is convenient for the bobbin yarn to slip and prevent overlapping; during the deceleration stage of the bobbin yarn, the solenoid valve is connected to the low-balance air pressure air circuit, and the contact pressure between the bobbin yarn and the groove drum is increased, which is convenient for the speed reduction follow-up of the bobbin yarn and the groove drum.

[0013] Further improvement of the above technical solution: in step 2, the cycle of the change of the bobbin contact pressure and the anti-overlapping cycle of the bobbin are both 1.2-2.0 seconds, the time of the bobbin acceleration stage is 0.3-0.6 seconds, and the time of the bobbin deceleration stage is 0.9-1.4 seconds.

[0014] The advantages and positive effects of the present invention are: 1. The present invention enables accurate, convenient and variable control of the balanced air pressure in the overlapping area and the non-overlapping area of ​​the bobbin.

[0015] 2. The present invention can improve the anti-overlapping effect of the overlapping area of ​​the bobbin yarn, reduce the friction damage of the yarn, and improve the bobbin yarn forming quality.

[0016] 3. The present invention adopts dual-path balanced air pressure, which can effectively take into account both the quality of the bobbin forming and the size of the bobbin.

[0017] 4. The present invention increases the service life of existing mechanical parts.

[0018] In summary, the present invention is designed to provide an electrified system with precise control and real-time variable contact pressure of the bobbin yarn, which can realize contact pressure control in the overlapping area of ​​the bobbin yarn and ensure the service life of mechanical parts. It can not only ensure that the bobbin diameter meets the packaging requirements, but also achieve the bobbin yarn without overlapping winding and unwinding, reduce unwinding breakage caused by yarn wear, and improve the production efficiency and quality of the next process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a package yarn contact pressure control system of the present invention; Figure 2 It is a schematic diagram of a single spindle operation of a package yarn contact pressure control system of the present invention; Figure 3 It is a schematic diagram of the overall layout of a package yarn contact pressure control system of the present invention; Figure 4 The present invention is a flow chart of a control method of a package yarn contact pressure control system.

[0020] The numbers in the figure are: 1. soft air pipe; 2. solenoid valve; 3. tension spring; 4. tension spring gear; 5. balancing cylinder; 6. cylinder gear; 7. bobbin cradle; 8. big end wheel; 9. small end wheel; 10. bobbin; 11. grooved drum; 12. frame; 13. yarn clearer; 14. splicer; 15. bobbin suction nozzle; 16. tension disk; 17. tube suction nozzle; 18. yarn guide; 19. tube; 20. single spindle of winding machine; 21. whole machine head; 22. pressure regulating valve; 23. low balanced air pressure air circuit; 24. high balanced air pressure air circuit; 25. splicing air circuit; 26. single spindle air circuit. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings: See also Figure 1-Figure 3 An embodiment of a bobbin contact pressure control system of the present invention comprises a whole machine head 21, a winding machine compressed air channel, a winding machine single spindle 20 and a control system, wherein the winding machine single spindle 20 comprises a grooved drum 11, a grooved drum transmission mechanism, a bobbin pressurizing mechanism and a connecting pipeline, wherein the bobbin pressurizing mechanism comprises a bobbin cradle 7, a balancing cylinder 5, a tension spring 3 and a bobbin cradle swinging assembly. The bobbin compressed air channel is connected to an external compressed air source, and each balancing cylinder 5 is connected to the bobbin compressed air channel through the connecting pipeline. The control system controls the rotation speed of the grooved drum through the grooved drum transmission mechanism to prevent the bobbin from overlapping. The bobbin compressed air channel comprises at least two air paths, one of which is connected to a pressure regulating valve 22 as a low-balanced air pressure air path 23, and the other is connected to a pressure regulating valve 22 as a high-balanced air pressure air path 24. Each balancing cylinder 5 is equipped with a solenoid valve 2, which includes at least two air inlets, one air outlet and one exhaust port. The two air inlets are respectively connected to the low balancing air pressure circuit 23 and the high balancing air pressure circuit 24 through the connecting pipeline, and the air outlet is connected to the air inlet of the balancing cylinder 5. The pressure regulating valve 22 and the solenoid valve 2 are both controlled by the control system, and are used to periodically and alternately input balancing air pressure gas or high balancing air pressure gas into the balancing cylinder 5 when the bobbin 10 is wound in the overlapping area, so as to realize the variable and precise control of the contact pressure of the bobbin 10, and improve the anti-overlapping effect and quality of the bobbin 10.

[0022] Furthermore, the above-mentioned low balanced air pressure air circuit 23 and high balanced air pressure air circuit 24 are both metal pipes laid in the whole machine. The two air inlets of each solenoid valve 2 are respectively connected to the two metal pipes through the soft air pipe 1, and the air inlet hole of the balancing cylinder 5 is connected to the air outlet of the corresponding solenoid valve 2 through the soft air pipe 1.

[0023] Furthermore, the above-mentioned winding machine single spindle 20 also includes a yarn guide 18, a tube yarn suction nozzle 17, a cone yarn suction nozzle 15, a tension disk 16, a twister 14 and an electronic yarn clearer 13. The cone yarn cradle swing assembly includes a tension spring gear 4, a cylinder gear 6 and a swing arm that are arranged to rotate on the frame 12. One end of the tension spring 3 is fixed on the frame 12, and the other end is fixed on the swing arm. The telescopic 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 and is connected to 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 which is a splicing air path 25 connected to a pressure regulating valve 22, which is used to supply air to the splicer 14 in each single spindle 20 of the winding machine, another is a single spindle air path 26 that is directly connected to the single spindle 20 of the winding machine without pressure regulation, and the remaining two paths are a low balanced air pressure air path 23 and a high balanced air pressure air path 24.

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

[0026] like Figure 1 As shown, the bobbin yarn 10 is fixed on the bobbin yarn cradle 7 by the large end wheel 8 and the small end wheel 9, and the contact pressure between the bobbin yarn 10 and the grooved drum 11 is jointly determined by the tension spring 3 and the balancing cylinder 5. The tension spring 3 pulls downward with a fixed tension, driving the tension spring gear 4 to produce a clockwise rotation trend, and the cylinder gear 6 meshing with the tension spring gear 4 has a counterclockwise rotation trend. At this time, the bobbin yarn cradle 7 is pressed downward by the tension generated by the tension spring 3, and the contact pressure between the bobbin 10 sandwiched between the large end wheel 8 and the small end wheel 9 and the grooved drum 11 increases; when the balancing cylinder 5 is connected to the air pressure, the balancing cylinder 5 is lifted upward by the air pressure, driving the cylinder gear 6 to produce a clockwise rotation trend, which is opposite to the counterclockwise rotation trend of the cylinder gear 6 caused by the tension of the tension spring 3, so that the downward pressure of the bobbin yarn cradle 7 becomes smaller, thereby achieving the purpose of controlling the contact pressure of the bobbin yarn. The existing structure is that one path of compressed air is connected to the balance cylinder 5 through a soft air pipe. After the air pressure of the compressed air is set, it remains unchanged during the operation of the equipment, that is, the contact pressure between the package yarn 10 and the groove drum 11 remains basically unchanged during the entire production process. The present invention connects the low balance air pressure air path 23 and the high balance air pressure air path 24 with pressure difference to the balance cylinder 5 through the electromagnetic valve 2, and controls the electromagnetic valve 2 to open and close within a specific diameter range of the package yarn 10 through the control system, so as to achieve the purpose of accurately and quickly controlling the contact pressure of the package yarn 10.

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

[0028] Working principle of the present invention: like Figure 1As shown, the bobbin yarn 10 is fixed on the bobbin yarn cradle 7 by the large end wheel 8 and the small end wheel 9, and the contact pressure between the bobbin yarn 10 and the grooved drum 11 is jointly determined by the tension spring 3 and the balancing cylinder 5. The tension spring 3 pulls downward with a fixed tension, driving the tension spring gear 4 to produce a clockwise rotation trend, and the cylinder gear 6 meshing with the tension spring gear 4 has a counterclockwise rotation trend. At this time, the bobbin yarn cradle 7 is pressed downward by the tension generated by the tension spring 3, and the contact pressure between the bobbin 10 sandwiched between the large end wheel 8 and the small end wheel 9 and the grooved drum 11 increases; when the balancing cylinder 5 is connected to the air pressure, the balancing cylinder 5 is lifted upward by the air pressure, driving the cylinder gear 6 to produce a clockwise rotation trend, which is opposite to the counterclockwise rotation trend of the cylinder gear 6 caused by the tension of the tension spring 3, so that the downward pressure of the bobbin yarn cradle 7 becomes smaller, thereby achieving the purpose of controlling the contact pressure of the bobbin yarn. In the prior art, compressed air is connected to the balancing cylinder 5 through a soft air pipe. After the air pressure of the compressed air is set, it remains unchanged during the operation of the equipment, that is, the contact pressure between the bobbin 10 and the grooved drum 11 remains basically unchanged during the entire production process.

[0029] The present invention connects the low-balance air pressure circuit 23 and the high-balance air pressure circuit 24 with pressure difference to the balance cylinder 5 through the electromagnetic valve 2 with two air inlets. When the electromagnetic valve 2 is in operation, it periodically connects the low-balance air pressure circuit 23 or the high-balance air pressure circuit 24. The tension provided by the tension spring 3 is constant. When the low-pressure compressed air delivered by the low-balance air pressure circuit 23 is connected, the balance cylinder 5 moves downward, driving the cylinder gear 6 to rotate counterclockwise, the bobbin cradle 7 has a downward pressure trend, and the contact pressure between the bobbin 10 and the groove drum 11 increases; when the high-pressure compressed air is connected, the balance cylinder 5 moves upward, driving the cylinder gear 6 to rotate clockwise, the bobbin cradle 7 has a lifting trend, and the contact pressure between the bobbin 10 and the groove drum 11 decreases.

[0030] like Figure 2 As shown, when the diameter of the bobbin 10 is outside the overlapping area (non-overlapping area), the balancing cylinder 5 of the single spindle 20 is connected to the low balancing air pressure air circuit 23. When the diameter of the bobbin 10 reaches one or two times the diameter of the grooved drum 11, it reaches the overlapping area of ​​the bobbin 10, and the electronic anti-overlapping begins to control the grooved drum 11 to perform periodic acceleration and deceleration 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, and the cycle is consistent with the anti-overlapping cycle; therefore, when the grooved drum 11 is accelerating during the electronic anti-overlapping, the balancing cylinder 5 is connected to the high balancing air pressure air circuit 24, the supporting force on the bobbin cradle 7 is increased, and the contact pressure of the bobbin 10 is reduced; when the grooved drum 11 is decelerating during the electronic anti-overlapping, the balancing cylinder 5 is connected to the low balancing air pressure air circuit 23, the supporting force on the bobbin cradle 7 is reduced, and the contact pressure of the bobbin 10 is increased. In the entire overlapping area of ​​the bobbin, the winding speed of the bobbin 10 changes periodically, and the contact pressure of the bobbin 10 changes periodically.

[0031] like Figure 3As shown, the low-balanced air pressure circuit 23 and the high-balanced air pressure circuit 24 can be adjusted according to actual conditions. Within a certain range, the greater the pressure difference between the two (the lower the air pressure of the low-balanced air pressure circuit 23, the higher the air pressure of the high-balanced air pressure circuit 24), the greater the change in the contact pressure of the yarn in the overlapping area of ​​the yarn 10, which is more conducive to the slip between the yarn 10 and the groove drum 11 in the acceleration stage, and the better the tracking performance between the yarn 10 and the groove drum 11 in the deceleration stage. At the same time, the periodic change of the contact pressure of the yarn 10 is conducive to reducing the damage to the tube yarn 19 caused by the high-speed friction between the yarn 10 and the groove drum 11. On the other hand, the higher the contact pressure of the cone yarn 10, the smaller the diameter of the cone yarn 10, and vice versa. From the perspective of cone yarn 10 packaging, a smaller cone yarn 10 diameter is more advantageous, because the present invention does not use high-pressure air circuit (low contact pressure) throughout the whole process, but only uses alternating high and low contact pressures in the overlapping area, and the non-overlapping area still operates with high contact pressure. Therefore, the size of the cone diameter 10 is well controlled, which is consistent with the cone diameter size under the prior art.

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

[0033] 2. When producing chemical fiber or chemical fiber blended yarn, a larger pressure difference can be used, and when producing cotton yarn, a smaller pressure difference can be used.

[0034] 3. The overlapping area of ​​the bobbin yarn generally refers to the range when the diameter of the bobbin yarn 10 is one or two times the diameter of the grooved drum 11, and the rest of the diameter range of the bobbin yarn 10 is the non-overlapping area.

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

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

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

[0038] 7. The single spindle gas circuit 26 supplies gas to a single spindle and does not require additional pressure regulation.

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

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

[0041] See also Figure 1-Figure 4, an embodiment of a control method of the above-mentioned package yarn contact pressure control system of the present invention is characterized in that the control method comprises the following steps: Step 1: After the preparation work of winding the bobbin 19 on the single spindle 20 of the winding machine is completed, the control system controls the groove 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 path 23, and continuously inputs low-balance gas to the balance cylinder 5, and operates with a higher contact pressure of the bobbin 10; Step 2: When the diameter of the bobbin 10 reaches a specific value (the range when the diameter of the bobbin 10 is one or two times the diameter of the grooved drum 11), and enters the overlapping area of ​​the bobbin 10, the control system controls the solenoid valve 2 to perform periodic action, so that the two air inlets of the solenoid valve 2 are alternately opened and closed to connect the high-balanced air pressure path 24 or the low-balanced air pressure path 23, and the high-balanced gas or the low-balanced gas is alternately input into the balancing cylinder 5, so that the air pressure in the balancing cylinder 5 changes periodically. In the entire overlapping area of ​​the bobbin 10, the control system controls the winding speed of the bobbin 10 to change periodically, and the contact pressure of the bobbin 10 changes periodically in the same manner; Step 3: After passing the overlapping area of ​​the bobbin yarn 10 and entering the non-overlapping area of ​​the bobbin yarn 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 bobbin yarn 10 reaches a specific value again (the range when the diameter of the bobbin yarn 10 is one or two times the diameter of the groove drum 11) and enters the overlapping area of ​​the bobbin yarn 10 again, it operates according to the control method of step 2; the above control method is cyclically operated until the winding of the bobbin yarn 10 is completed.

[0042] Furthermore, in the above step 2, the cycle of the change of the contact pressure of the bobbin yarn 10 is consistent with the anti-overlapping cycle of the bobbin yarn 10, and the acceleration stage time of the bobbin yarn 10 is less than the deceleration stage time of the bobbin yarn 10; in the acceleration stage of the bobbin yarn 10, the solenoid valve 2 is connected to the high-balance air pressure air circuit 24, and the contact pressure between the bobbin yarn 10 and the groove drum 11 is reduced, which is convenient for the bobbin yarn 10 to slip and prevent overlapping; in the deceleration stage of the bobbin yarn 10, the solenoid valve 2 is connected to the low-balance air pressure air circuit 23, and the contact pressure between the bobbin yarn 10 and the groove drum 11 is increased, which is convenient for the speed reduction follow-up of the bobbin yarn 10 and the groove drum 11.

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

[0044] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A bobbin contact pressure control system, comprising a complete machine head, a winding machine compressed air channel, a winding machine single spindle and a control system, the winding machine single spindle comprises a grooved drum, a grooved drum transmission mechanism, a bobbin pressurizing mechanism and a connecting pipeline, the bobbin pressurizing mechanism comprises a bobbin cradle, a balancing cylinder, a tension spring and a bobbin cradle swing assembly, the winding machine compressed air channel is connected to an external compressed air source, each of the balancing cylinders is connected to the winding machine compressed air channel through the connecting pipeline, the control system controls the rotation speed of the grooved drum through the grooved drum transmission mechanism to prevent the bobbin from overlapping, characterized in that The compressed air channel of the winding machine includes at least two air circuits, one of which is connected to a pressure regulating valve as a low balanced air pressure circuit, and the other is connected to a pressure regulating valve as a high balanced air pressure circuit. Each of the balanced cylinders is equipped with a solenoid valve, and the solenoid valve includes at least two air inlets, an air outlet and an exhaust port. The two air inlets are respectively connected to the low balanced air pressure circuit and the high balanced air pressure circuit through the connecting pipeline, and the air outlet is connected to the air inlet hole of the balanced cylinder. The pressure regulating valve and the solenoid valve are both controlled by the control system, and are used for periodically and alternately inputting balanced air pressure gas or high balanced air pressure gas into the balanced cylinder when the bobbin yarn is wound in the overlapping area, so as to realize the precise control of the variable contact pressure of the bobbin yarn, and improve the anti-overlapping effect and the quality of the bobbin yarn.

2. The package yarn contact pressure control system according to claim 1, characterized in that: The low-balanced air pressure circuit and the high-balanced air pressure circuit are both metal pipes arranged in the whole machine. The two air inlets of each solenoid valve are connected to the two metal pipes through a soft air pipe respectively, and the air inlet of the balancing cylinder is connected to the air outlet of the corresponding solenoid valve through a soft air pipe.

3. The package yarn contact pressure control system according to claim 1 or 2, characterized in that: The single spindle of the winding machine also includes a yarn guide, a tube yarn suction nozzle, a cone yarn suction nozzle, a tension disk, a splicer and an electronic yarn clearer. The cone yarn cradle swing assembly includes a tension spring gear, a cylinder gear and a swing arm that are arranged to 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 balancing cylinder is connected to the rotating shaft of the cylinder gear.

4. The package yarn contact pressure control system according to claim 3, characterized in that: An external compressed air source is connected to the head of the whole machine and is connected to 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, wherein one path is a splicing air path connected to a pressure regulating valve, which is used to supply air to the splicer in each single spindle of the winding machine, another path is a single spindle air path that is directly connected to a single spindle of the winding machine without pressure regulation, and the remaining two paths are the low balanced air pressure air path and the high balanced air pressure air path.

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

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

7. The package contact pressure control system according to claim 4, characterized in that: The air pressure of the external compressed air source is at least 10 bar, the air pressure of the high balanced air pressure air circuit is greater than the air pressure of the low balanced air pressure air circuit, the air pressure of the high balanced air pressure air circuit is 1.5-2.0 bar, and the air pressure of the low balanced air pressure air circuit is 0.5-1.0 bar.

8. A control method for a package contact pressure control system according to any one of claims 1 to 7, characterized in that: The control method comprises 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 groove drum to start high-speed winding. When high-speed winding is performed in the non-overlapping area of ​​the bobbin, the solenoid valve is in zero position, and the solenoid valve has only one air inlet connected to the low-balance air pressure air path, and continuously inputs low-balance gas to the balance cylinder to operate at a higher bobbin contact pressure; Step 2: When the diameter of the bobbin reaches a specific value and enters the bobbin overlapping area, the control system controls the solenoid valve to perform periodic action, so that the two air inlets of the solenoid valve are alternately opened and closed to connect the high balance air pressure air path or the low balance air pressure air path, and high balance gas or low balance gas is alternately input into the balance cylinder to make the air pressure in the balance cylinder change periodically. In the entire bobbin overlapping area, the control system controls the bobbin winding speed to change periodically, and the bobbin contact pressure makes the same periodic change; Step 3: After passing the yarn overlap zone and entering the yarn non-overlap zone, the control system controls the solenoid valve to return to zero position and operates according to the control method of step 1; when the yarn diameter reaches a specific value again and enters the yarn overlap zone, it operates according to the control method of step 2; the control method is cyclically operated until the yarn winding is completed.

9. The control method of the package contact pressure control system according to claim 8, characterized in that: In step 2, the cycle of the change of the contact pressure of the bobbin yarn is consistent with the anti-overlapping cycle of the bobbin yarn, and the acceleration stage time of the bobbin yarn is shorter than the deceleration stage time of the bobbin yarn; during the acceleration stage of the bobbin yarn, the solenoid valve is connected to the high-balance air pressure air circuit, and the contact pressure between the bobbin yarn and the groove drum is reduced, which is convenient for the bobbin yarn to slip and prevent overlapping; during the deceleration stage of the bobbin yarn, the solenoid valve is connected to the low-balance air pressure air circuit, and the contact pressure between the bobbin yarn and the groove drum is increased, which is convenient for the speed reduction follow-up of the bobbin yarn and the groove drum.

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

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