Intelligent tension control device for yarn production and control method thereof

Abstract

The application relates to the technical field of intelligent yarn tension control, and discloses an intelligent tension control device for yarn production, which comprises a servo tensioner, a tension rod, a main shaft, a rotating rod frame and a tension spring; an assembling frame is arranged on the outer wall of the servo tensioner, a limiting frame is arranged in the assembling frame, monitoring rollers are arranged in the limiting frame, and cross-thread grooves are arranged on the surfaces of the monitoring rollers. The intelligent tension control device for yarn production is provided with elastic metal sheets arranged in the limiting frame, sensing elements and limiting units on the tension rod, so that when a yarn joint knot passes through the monitoring rollers and generates axial displacement, the elastic metal sheets trigger the sensing elements, the annular electromagnet is electrified and generates magnetic repulsion force on the iron panel, the damping rubber block is rapidly pressed against the arc-shaped friction pad, the tension rod is mechanically locked, and the instantaneous impact of the joint knot on the tension rod is prevented from being mis-sensed by the displacement sensor.

Description

Technical Field

[0001] This invention relates to the field of intelligent yarn tension control technology, specifically to an intelligent tension control device and control method for yarn production. Background Technology

[0002] In high-speed processes such as winding, warping, and weaving in yarn production, to ensure stable unwinding tension, reduce yarn breakage, and guarantee the forming density of yarn packages, an intelligent tension control device based on servo control, namely a servo tensioner, is commonly used. A servo tensioner typically consists of three parts: a tension detection mechanism, a signal processing and control unit, and a servo actuator. The core of the tension detection mechanism is a tension rod that can swing around a fulcrum. One end of the rod is provided with preload through a tension spring, and the yarn passes through the working surface of the tension rod. During normal operation, the yarn tension causes the tension rod to produce a slight swing corresponding to the tension value. A high-sensitivity displacement sensor converts this swing into an electrical signal in real time and sends it to the controller. The controller compares the current tension detection value with the process setting value and then drives the servo motor to adjust the yarn feeding speed or the tension plate pressure, thereby forming a closed-loop tension control. This intelligent tension control device has a rapid response and high control precision, and can effectively follow the normal tension fluctuations during the yarn unwinding process. It has become an important configuration for equipment such as precision winding machines and warping machines. In yarn production, yarn breakage is an unavoidable phenomenon. To ensure production continuity and yarn length integrity, automatic splicers are commonly used in the winding process. When a breakage is detected, the splicer immediately splices the broken ends of the two yarns together pneumatically or mechanically, reconnecting the yarns. However, the splicing process inevitably results in a yarn cross-sectional diameter at the connection point that is significantly larger than the normal yarn body, forming a relatively hard protruding structure, known as a splice lump. In actual production, each yarn bobbin often has multiple such splice lumps. When the yarn carrying the splice lump enters the tension control zone of the servo tensioner at a high speed of hundreds of meters per minute and passes through the working surface of the tension rod, the splice lump does not pass smoothly but instead causes an instantaneous impact on the tension rod. To sensitively detect changes in yarn tension, the tension bar must maintain a flexible, swingable state under the action of a tension spring. The instantaneous impact force generated by this collision far exceeds the magnitude of normal tension fluctuations, forcing the tension bar to wobble unrelated to the actual tension change. The displacement sensor accurately captures this mechanical wobble as a large-amplitude electrical signal jump. However, the controller cannot distinguish whether this signal jump originates from a genuine tension change or from interference from the impact of a knot in the yarn joint, easily misinterpreting it as a sharp increase in tension and instructing the servo actuator to perform a reverse adjustment. This erroneous response causes the actual yarn tension to deviate significantly from the set value within a short period, not only causing localized abrupt changes in the yarn winding density and affecting the forming quality, but also leading to uneven tension and increased yarn breakage in subsequent unwinding processes. Therefore, we propose an intelligent tension control device and its control method for yarn production. Summary of the Invention

[0003] The purpose of this invention is to provide an intelligent tension control device and control method for yarn production, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an intelligent tension control device for yarn production, comprising a servo tensioner, a tension rod disposed on one side of the servo tensioner, and a main shaft rotatably connected to the servo tensioner mounted on the side wall of the servo tensioner, one end of the tension rod being fixedly connected to the main shaft, and a rotating rod frame rotatably connected to the servo tensioner mounted on the side wall of the servo tensioner, with a tension spring connecting the tension rod and the rotating rod frame; and an assembly frame fixedly mounted on the outer wall of the servo tensioner, with a limit frame disposed inside the assembly frame, a monitoring roller disposed inside the limit frame, and a cross-threaded groove disposed on the surface of the monitoring roller; A connecting part is provided between the limiting frame and the monitoring roller. Multiple elastic metal sheets are fixedly installed on the inner walls of both ends of the limiting frame. The multiple elastic metal sheets are in contact with the ends of the monitoring roller. A sensing element is fixedly installed on the inner walls of both ends of the limiting frame. The sensing element is located on the movement trajectory of one of the elastic metal sheets. A limiting unit is provided on the tension rod. The limiting unit is used to control the movement state of the tension rod.

[0005] Preferably, the connecting part includes a rotating shaft that is rotatably connected to the inner walls of both ends of the limiting frame via a bearing, and multiple limiting grooves are symmetrically opened on the rotating shaft. Multiple balls are embedded in the inner walls of both ends of the monitoring roller, and the balls correspond one-to-one with the limiting grooves and slide along their trajectory. Limiting sliders are fixedly installed at both ends of the limiting frame.

[0006] Preferably, guide grooves are provided on both sides of the assembly frame, the limiting slider is located in the guide groove and slidably connected thereto, and a plastic spring is connected between the limiting slider and the inner wall of the guide groove.

[0007] Preferably, the limiting unit includes a demagnetizing sleeve fixedly mounted on the tension rod, and an annular electromagnet fixedly mounted inside the demagnetizing sleeve. The annular electromagnet is electrically connected to a sensing element, and an iron panel slidably connected to the inner wall of the demagnetizing sleeve is provided on one side of the annular electromagnet. A steel shaft is fixedly mounted on the iron panel. One end of the steel shaft penetrates the inner wall of the demagnetizing sleeve and extends to the outside, and a damping rubber block is fixedly mounted thereon. A return spring is connected between the damping rubber block and the outer wall of the demagnetizing sleeve. An arc-shaped friction pad is fixedly mounted on the side wall of the servo tensioner. When the annular electromagnet is energized, it generates a magnetic force on the iron panel, and the iron panel, through the steel shaft, makes the damping rubber block and the arc-shaped friction pad in close contact.

[0008] Preferably, one end of the rotating shaft passes through one of the limiting sliders and extends to the outside, and is fixedly mounted with a meshing gear; another limiting slider is also fixedly mounted with an annular frame, and an annular panel is provided inside the annular frame; the other end of the rotating shaft passes through the limiting slider and is fixedly connected to the annular panel; multiple fixed frames are fixedly mounted on the annular panel; each fixed frame has a strip slider that is slidably connected to its inner wall; one end of the strip slider is located outside the fixed frame and is fixedly mounted with an arc-shaped panel; a spring body is connected between the strip slider and the inner wall of the fixed frame.

[0009] Preferably, a support frame is fixedly installed on the top of the annular frame, a button is fixedly installed on the inner wall of the top of the support frame, and a trigger shaft is provided below the button, wherein one end of the trigger shaft passes through the inner wall of the support frame and extends into the interior of the annular frame, and the trigger shaft is located on the movement trajectory of the arc-shaped panel.

[0010] Preferably, a strip toothed row is provided above the meshing gear. The strip toothed row is fixedly installed on the outer wall of one side of the assembly frame. During the limiting slider's sliding along the guide groove, the meshing gear meshes with the strip toothed row.

[0011] Preferably, a drive shaft is provided on one side of the monitoring roller, and a wiping roller made of sponge material is installed on the drive shaft. Each guide groove is also equipped with a movable slider that is slidably connected to its inner wall. The drive shaft is rotatably connected to the movable slider. A spring is also connected between the movable slider and the inner wall of the guide groove. When the limiting slider moves in a direction within the guide groove, the wiping roller is located on the movement trajectory of the monitoring roller.

[0012] Preferably, a square electromagnet is symmetrically mounted on one end of the assembly frame, and a block magnet is symmetrically mounted on one end of the limiting frame. The square electromagnet is electrically connected to the button, and the square electromagnet is energized to generate a repulsive force on the block magnet.

[0013] A method for controlling an intelligent tension control device used in yarn production specifically includes the following steps: S1: Normal yarn passes through the monitoring roller. The yarn drives the monitoring roller to rotate through friction. The monitoring roller drives the rotating shaft to rotate through the ball bearings and the limiting groove. The rotating shaft drives the annular panel and the fixed frame to rotate. The strip slider and the arc panel expand outward under the action of centrifugal force. The arc panel pushes the trigger shaft to press the button. The button remains in the on state. The square electromagnet is de-energized. The limiting frame is in the initial position under the action of the plastic spring. The monitoring roller and the wiping roller remain separated. S2: When the splice knot on the yarn moves to the monitoring roller, the splice knot squeezes the cross thread groove and generates an axial force, which pushes the monitoring roller to move axially along the limiting slide groove. The end of the monitoring roller pushes the elastic metal sheet on the corresponding side, causing one of the elastic metal sheets to trigger the sensing element. S3: After the sensing element is triggered, it outputs an electrical signal, which energizes the annular electromagnet inside the demagnetizing sleeve. The annular electromagnet generates a repulsive force on the iron panel. The iron panel pushes the damping rubber block to press against the arc-shaped friction pad through the steel shaft, mechanically locking the tension rod and preventing it from swinging due to the impact of the joint lug. After the joint lug passes the monitoring roller, the elastic metal sheet pushes the monitoring roller to reset and disengage from the sensing element. After the joint lug passes the tension rod, the annular electromagnet is de-energized, and the damping rubber block separates from the arc-shaped friction pad under the action of the reset spring, and the tension rod returns to its free swing state. S4: When the surface of the monitoring roller is contaminated with pollutants, causing the rotation speed to decrease, the centrifugal force decreases, causing the arc panel and strip slider to retract into the fixed frame, triggering the shaft to descend, the button to disconnect, the square electromagnet to be energized and generate a repulsive force on the block magnet, pushing the limit frame to move along the guide groove, the plastic spring is stretched, the meshing gear meshes with the strip gear and drives the rotating shaft and monitoring roller to rotate, the monitoring roller moves to contact the wiping roller, and the wiping roller wipes and cleans the surface of the monitoring roller with a certain pressure under the action of the spring. S5: After the limit frame moves to the end, the square electromagnet is de-energized, the repulsive force disappears, the plastic spring pulls the limit frame to reset, the monitoring roller and the wiping roller disengage, the meshing gear separates from the rack, and the moving slider and the wiping roller reset under the action of the spring, restoring the normal joint knot monitoring state.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention utilizes an elastic metal sheet and a sensing element set within a limiting frame, in conjunction with a limiting unit on a tension rod. When a yarn splice knot passes the monitoring roller and generates axial displacement, the elastic metal sheet triggers the sensing element, energizing the annular electromagnet and generating a magnetic repulsive force on the iron panel. This drives the damping rubber block to quickly press against the arc-shaped friction pad, mechanically locking the tension rod at the current angle. This prevents the momentary impact of the splice knot on the tension rod from being mistakenly detected by the displacement sensor, avoiding the controller misinterpreting the impact interference as a sudden tension change and making incorrect reverse adjustments. This significantly improves the winding forming quality and yarn unwinding stability. 2. This invention utilizes the coordinated operation of an annular panel, fixed frame, strip slider, spring body, and arc panel within an annular frame, along with a button, trigger shaft, square electromagnet, and block magnet on the support frame. It monitors the roller's rotational speed to reflect its surface friction state in real time. When the roller's surface is contaminated with slightly sticky pollutants such as cotton wax or spinning oil, causing a decrease in rotational speed, the centrifugal force on the arc panel is insufficient to overcome the spring's tension, causing it to contract inwards. The trigger shaft then falls back, disengaging the button. The square electromagnet is then energized and generates a repulsive force on the block magnet, pushing the entire limiting frame to move the monitoring roller towards the wiping roller and engage with the strip toothed row to rotate. This allows the monitoring roller to be cleaned by the sponge wiping roller during its movement, achieving self-sensing and self-cleaning of contamination status. This solves the problem of missed detection of yarn splice knots due to changes in the friction coefficient caused by surface contamination, ensuring long-term reliability of yarn splice knot detection. 3. This invention uses a cross-threaded groove on the surface of the monitoring roller, combined with symmetrically opened limiting grooves on the ball and the rotating shaft, to enable normal yarn to drive the monitoring roller to rotate. When a knot passes through, it generates a small displacement along the axial direction of the monitoring roller to trigger the sensing element. After the knot passes through, the elastic metal sheet pushes the monitoring roller to automatically reset by its own elastic restoring force. This achieves non-destructive, rapid response identification of yarn knots and automatic device reset, ensuring continuous production. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the assembly frame and limiting frame structure of the present invention; Figure 3 This is a schematic diagram of the assembly frame and limiting frame of the present invention from another angle; Figure 4 This is a top view of the frame and limiting frame structure of the present invention; Figure 5 This is a schematic diagram of the limiting frame structure of the present invention; Figure 6 This is a schematic diagram of the limiting frame and monitoring roller structure of the present invention; Figure 7 This is a schematic diagram of the internal structure of the limiting frame and monitoring roller of the present invention; Figure 8 This is a front view of the internal structure of the limiting frame and monitoring roller of the present invention; Figure 9 This is a schematic diagram showing the separation of the limiting frame, monitoring roller, and rotating shaft structure of the present invention; Figure 10 This is a schematic diagram of the limiting frame and ring frame structure of the present invention; Figure 11 This is a schematic diagram of the internal structure of the annular frame of the present invention; Figure 12 This is a schematic diagram of the annular panel and the arc-shaped panel structure of the present invention; Figure 13 This is a schematic diagram of the limiting unit structure of the present invention.

[0016] In the diagram: 1. Servo tensioner; 2. Tension rod; 3. Main shaft; 4. Rotating rod frame; 5. Tension spring; 6. Assembly frame; 61. Guide groove; 62. Plastic spring; 63. Strip toothed rack; 64. Square electromagnet; 7. Limiting frame; 71. Monitoring roller; 72. Cross threaded groove; 73. Connecting part; 731. Rotating shaft; 732. Limiting groove; 733. Ball bearing; 74. Elastic metal sheet; 75. Sensing element; 76. Limiting slider; 77. Meshing gear; 78. Annular frame; 79. 791. Annular panel; 792. Fixed frame; 793. Strip slider; 794. Arc panel; 795. Spring body; 70. Support frame; 706. Button; 707. Trigger shaft; 708. Block magnet; 8. Limiting unit; 81. Demagnetizing sleeve; 82. Annular electromagnet; 83. Iron panel; 84. Steel shaft; 85. Damping rubber block; 86. Return spring; 9. Arc friction pad; 10. Drive shaft; 101. Wiping roller; 102. Moving slider; 103. Spring part. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1-13This invention provides a technical solution: an intelligent tension control device for yarn production, comprising a servo tensioner 1, a tension rod 2 disposed on one side of the servo tensioner 1, a main shaft 3 rotatably connected to the servo tensioner 1 mounted on its side wall, one end of the tension rod 2 fixedly connected to the main shaft 3, a rotating rod frame 4 rotatably connected to the servo tensioner 1 mounted on its side wall, and a tension spring 5 connected between the tension rod 2 and the rotating rod frame 4. Yarn passes through the working surface of the tension rod 2 and is subjected to pressure. During normal operation, the yarn tension and the tension of the tension spring 5 maintain a dynamic balance. The tension rod 2 oscillates slightly around the main shaft 3, corresponding to the tension value. The detection element inside the tensioner 1 converts the oscillation amount into an electrical signal, which is then driven by the controller to adjust the yarn feeding speed or tension plate pressure, forming a closed-loop tension control. Since the working principle of the servo tensioner 1 is existing technology, this invention does not describe it in detail. An assembly frame 6 is fixedly installed on the outer wall of the servo tensioner 1. A limit frame 7 is set inside the assembly frame 6, and a monitoring roller 71 is set inside the limit frame 7. The surface of the monitoring roller 71 is machined with a cross-threaded groove 72. The cross-threaded groove 72 is smoothed and shallow, which can stably embed the yarn to achieve drive, and is not easy to hook the yarn fibers.

[0019] A connecting part 73 is provided between the limiting frame 7 and the monitoring roller 71. The connecting part 73 includes a rotating shaft 731 that is rotatably connected to the inner walls of both ends of the limiting frame 7 via bearings. Multiple limiting grooves 732 are symmetrically opened on the rotating shaft 731. Multiple balls 733 are embedded in the inner walls of both ends of the monitoring roller 71. Each ball 733 is located in the corresponding limiting groove 732 and can slide along its trajectory. Through this connection method, the monitoring roller 71 can rotate synchronously with the rotating shaft 731 and can also produce a slight reciprocating displacement relative to the rotating shaft 731 in the axial direction. Limiting sliders 76 are fixedly installed at both ends of the limiting frame 7. Guide grooves 61 are provided on both sides of the assembly frame 6. The limiting sliders 76 are located in the guide grooves 61 and are slidably connected to the guide grooves 61. A plastic spring 62 is connected between the limiting slider 76 and the inner wall of the guide groove 61. Under normal conditions, the plastic spring 62 maintains the limiting frame 7 in a set initial position. Multiple elastic metal sheets 74 are fixedly installed on the inner walls of both ends of the limiting frame 7. These elastic metal sheets 74 are in contact with the ends of the monitoring roller 71, providing a certain degree of axial elastic support for the monitoring roller 71, so that the monitoring roller 71 can maintain the normal monitoring position when there is no axial disturbance. Sensing elements 75 are fixedly installed on the inner walls of both ends of the limiting frame 7. Each sensing element 75 is located on the movement trajectory of one of the elastic metal sheets 74. That is, when the monitoring roller 71 moves axially and forces the elastic metal sheet 74 to undergo elastic deformation, one of the elastic metal sheets 74 will touch the sensing element 75, causing the sensing element 75 to output an electrical signal.

[0020] To quickly protect the tension control accuracy when a joint knot is detected, a limit unit 8 is provided on the tension rod 2. The limit unit 8 includes a demagnetizing sleeve 81 fixedly installed on the tension rod 2. An annular electromagnet 82 is fixedly installed inside the demagnetizing sleeve 81 and is electrically connected to the sensing element 75. An iron panel 83 is provided on one side of the annular electromagnet 82 and is slidably connected to the inner wall of the demagnetizing sleeve 81. A steel shaft 84 is fixedly installed on the iron panel 83. One end of the steel shaft 84 penetrates the inner wall of the demagnetizing sleeve 81 and extends to the outside, and a damping rubber block 85 is fixedly installed at this end. A return spring 86 is connected between the damping rubber block 85 and the outer wall of the end of the demagnetizing sleeve 81. An arc-shaped spring is fixedly installed on the side wall of the servo tensioner 1. The position of the arc-shaped friction pad 9 corresponds to the movement path of the damping rubber block 85. In the initial state, the annular electromagnet 82 is not energized, and the iron panel 83 is in the retracted position under the action of the return spring 86. There is a clear gap between the damping rubber block 85 and the arc-shaped friction pad 9, and no contact occurs. Therefore, the tension rod 2 can swing freely. When the sensing element 75 is triggered, the annular electromagnet 82 is energized and generates a magnetic repulsive force on the iron panel 83. The iron panel 83 overcomes the elastic force of the return spring 86 and pushes the damping rubber block 85 to quickly press it onto the arc-shaped friction pad 9 through the steel shaft 84. A sufficiently large frictional force is generated between the two, thereby mechanically locking the tension rod 2 at the current angle and preventing it from continuing to generate detection swing displacement.

[0021] In actual production environments, the monitoring roller 71 is in long-term contact with the yarn. Cotton wax, spinning oil, sizing agents, and short fibers carried on the yarn will gradually adhere to the surface of the monitoring roller 71, forming a low-friction coefficient contamination film. When the surface of the monitoring roller 71 is covered by such contaminants, its friction coefficient decreases significantly, the driving friction torque between the yarn and the monitoring roller 71 is greatly reduced, and the yarn is prone to slippage when passing at high speed, which significantly reduces the actual rotational speed of the monitoring roller 71, and may even cause rotational lag or intermittent stoppage.

[0022] Based on this, the present invention is designed as follows: one end of the rotating shaft 731 passes through one of the limiting sliders 76 and extends to the outside, and a meshing gear 77 is fixedly installed at this end. An annular frame 78 is also fixedly installed on the surface of the other limiting slider 76. An annular panel 79 is provided inside the annular frame 78. The other end of the rotating shaft 731 passes through the limiting slider 76 and is fixedly connected to the annular panel 79. Multiple fixing frames 791 are fixedly installed on the annular panel 79. One end of the fixing frame 791 is closed and the other end is open. Each fixing frame 791 has a strip slider 792 that can slide along its inner wall installed inside. One end of the strip slider 792 extends out from the opening of the fixing frame 791 and is fixedly installed with an arc-shaped panel 793. A spring body 794 is connected between the strip slider 792 and the inner wall of the fixing frame 791. The spring body 794 preferably uses a spring with a small spring coefficient so that when the yarn unwinding speed is low, that is, when the speed of the monitoring roller 71 is not high, a small centrifugal force can drive the strip slider 792 to generate sufficient radial force. Displacement; It should be noted that when the monitoring roller 71 is not rotating, multiple arc-shaped panels 793 are relatively gathered together under the tension of the spring body 794, forming a roughly circular but somewhat "disc-like" structure. The inner diameter of this disk is larger than the outer diameter of the annular panel 79. A support frame 70 is fixedly installed on the top of the annular frame 78, and a button 701 is fixedly installed on the inner wall of the top of the support frame 70. A trigger shaft 702 is provided below the button 701, and one end of the trigger shaft 702 passes through the support frame 79. The inner wall extends into the interior of the annular frame 78. The trigger shaft 702 is located on the trajectory of the outward movement of the arc panel 793. When the monitoring roller 71 is normally driven by the yarn and reaches a certain speed, the rotating shaft 731 drives the annular panel 79 and the fixed frame 791 to rotate. The strip slider 792, together with the arc panel 793, is subjected to centrifugal force and slides outward. The outer diameter of the arc panel 793 expands accordingly, pushing the trigger shaft 702 to rise and press the button 701, so that the button 701 is in a continuously triggered on state.

[0023] To achieve surface cleaning of the monitoring roller 71, the present invention symmetrically mounts square electromagnets 64 at one end of the assembly frame 6 and block magnets 703 symmetrically mounts at one end of the limiting frame 7. The square electromagnets 64 are electrically connected to the button 701. When the button 701 is pressed and turned on, the square electromagnets 64 are in a de-energized state; when the button 701 is released and turned off, the square electromagnets 64 are energized and generate a repulsive force on the block magnets 703. A drive shaft 10 is provided on one side of the monitoring roller 71, and a wiping roller 101 made of sponge material is mounted on the drive shaft 10. Each guide groove 61 is also equipped with a wiping roller that can move along the guide groove 61. The sliding slider 102 slides on the inner wall. The drive shaft 10 is rotatably connected to the sliding slider 102. A spring part 103 is connected between the sliding slider 102 and the inner wall of the guide groove 61. Under normal conditions, the square electromagnet 64 is not energized, the limiting frame 7 is in the initial position, and there is a certain distance between the monitoring roller 71 and the wiping roller 101. The two do not contact each other and will not cause unnecessary interference. A strip toothed rack 63 is also fixedly installed on one side of the outer wall of the assembly frame 6. The strip toothed rack 63 is located above the meshing gear 77. When the limiting slider 76 moves in a directional manner along the guide groove 61, the meshing gear 77 will engage with the strip toothed rack 63.

[0024] Specifically, during normal yarn operation, the surface of the yarn monitoring roller 71 passes through, and the frictional force causes the monitoring roller 71 to rotate. The ball bearings 733 on the inner wall of the monitoring roller 71 transmit torque to the rotating shaft 731 through the limiting groove 732, causing the rotating shaft 731 to rotate around its own axis. The rotating shaft 731 drives the annular panel 79 and the fixed frame 791 to rotate synchronously. The strip slider 792 and the arc panel 793 inside the fixed frame 791 are subjected to centrifugal force and slide outward along the fixed frame 791. The outer diameter of the discontinuous disk formed by multiple arc panels 793 expands, and the outer edge of the arc panel 793 touches and pushes the trigger shaft 702 upward. The trigger shaft 702 presses the button 701, and the button 701 remains in the OFF state. It should be noted that when the yarn is running at the normal unwinding speed, the monitoring roller 71 is stably driven. At this time, the centrifugal force on the strip slider 792 and the arc panel 793 is sufficient to overcome the tension of the spring body 794, causing the arc panel 793 to move radially to its designed maximum distance. In addition, steel balls are embedded at the contact end between the trigger shaft 702 and the arc panel 793. When the arc panel 793 moves radially to the maximum distance, the distance between the "breakpoints" between the arc panels 793 is still less than the outer diameter of the steel balls. At this time, the square electromagnet 64 is de-energized and does not exert a pushing force on the block magnet 703. The limiting frame 7 is stably stationary in the initial position under the support of the plastic spring 62, and the monitoring roller 71 remains separated from the wiping roller 101. When a knot appears on the yarn, because the cross-sectional diameter of the knot is significantly larger than that of the normal yarn, the protruding structure will violently compress against the cross-threaded groove 72 on the surface of the monitoring roller 71. The spiral shape of the cross-threaded groove 72 causes the compressive force of the knot to be decomposed into a component force along the axial direction of the monitoring roller 71, in addition to being perpendicular to the roller surface. When the monitoring roller 71 moves axially, its end will push the elastic metal sheet 74 on the corresponding side of the limiting frame 7, causing the elastic metal sheet 74 on that side to undergo elastic bending deformation. One of the elastic metal sheets 74 touches the sensing element 75, and the sensing element 75 is immediately triggered and outputs an electrical signal. After the sensing element 75 is triggered, the electrical signal is transmitted to the annular electromagnet 82 inside the demagnetizing sleeve 81. The annular electromagnet 82 is energized and generates a repulsive force on the iron panel 83. Under the action of the magnetic repulsive force, the iron panel 83 drives the steel shaft 84 to move in a directional manner, that is, the return spring 86 is in a state of... In the stretched state, the damping rubber block 85 is quickly pushed towards the arc-shaped friction pad 9 until the damping rubber block 85 and the arc-shaped friction pad 9 are tightly pressed together. At this time, the friction between the damping rubber block 85 and the arc-shaped friction pad 9 reliably locks the tension rod 2 at the current angle position, and the tension rod 2 can no longer swing around the main shaft 3. The purpose of locking the tension rod 2 is to prevent the joint knot from causing an instantaneous mechanical impact on the tension rod 2 when it passes through the working surface of the tension rod 2. If this impact is collected by the displacement sensor and taken as a real signal of a sharp increase in tension, it will cause the controller to make a reverse erroneous adjustment, causing the actual tension of the yarn to deviate seriously from the set value, which will lead to a sudden change in the winding density of the yarn and even frequent yarn breakage in subsequent processes. After the tension rod 2 is locked, even if the impact force of the subsequent joint knot is transmitted to the tension rod 2, the tension rod 2 will not produce a detection swing, the output signal of the displacement sensor remains stable, and the controller will not make a false response, thus effectively protecting the winding quality. Once the joint lump has completely passed through the monitoring roller 71, the axial thrust acting on the monitoring roller 71 disappears. The previously squeezed elastic metal sheet 74 pushes the monitoring roller 71 back to the axial center position by its own elastic restoring force. The elastic metal sheet 74 separates from the sensing element 75, and the sensing element 75 resets. It should be noted that after the sensing element 75 is not triggered, the annular electromagnet 82 is de-energized after a few seconds to confirm that the joint lump has passed the tension rod 2. The specific time can be determined according to the actual production situation. After the annular electromagnet 82 is de-energized, the magnetic repulsion force disappears, and the iron panel 83 and steel shaft 84 reset under the action of the stretched reset spring 86. The damping rubber block 85 disengages from the arc-shaped friction pad 9, and the tension rod 2 returns to a free swinging state, continuing to implement normal closed-loop control of yarn tension. When contaminants adhere to the surface of the monitoring roller 71, the rotation speed of the monitoring roller 71 decreases or stops, and the rotation speed of the rotating shaft 731 decreases or stops accordingly. The rotation speed of the annular panel 79 and the fixed frame 791 slows down or stops simultaneously. The centrifugal force on the strip slider 792 and the arc panel 793 decreases or disappears sharply. When the centrifugal force is insufficient to overcome the tension of the spring body 794, the arc panel 793 and the strip slider 792 contract into the fixed frame 791. The outer diameter of the breakpoint disk formed by the arc panel 793 shrinks. After the trigger shaft 702 loses the thrust of the arc panel 793, it falls downward. The button 701 changes from the on state to the off state. After button 701 is disconnected, the square electromagnet 64 is immediately energized, generating a repulsive force on the block magnet 703 opposite to it. This pushes the limiting frame 7 to move directionally along the guide groove 61, gradually stretching the plastic spring 62. During the movement of the limiting frame 7, the limiting slider 76 drives the meshing gear 77 to approach and mesh with the rack toothed column 63. As the limiting frame 7 continues to move, the rack toothed column 63 forces the meshing gear 77 to rotate, which in turn drives the monitoring roller 71 to rotate via the rotating shaft 731 and the ball bearing 733. At the same time, the monitoring roller 71 moves along with the limiting frame 7 towards the rubbing... The wiping roller 101 moves in a direction and comes into contact with the surface of the wiping roller 101. During the rotation of the monitoring roller 71, relative friction is generated between its surface and the wiping roller 101 made of sponge material. Under the push of the monitoring roller 71, the wiping roller 101 drives the moving slider 102 to move synchronously along the guide groove 61 through the drive shaft 10. The moving slider 102 compresses the spring part 103. The elastic force generated by the spring part 103 makes the wiping roller 101 always adhere to the surface of the monitoring roller 71 with appropriate pressure, thereby effectively wiping away the mixture of cotton wax, oil and short fibers adhering to the cross thread groove 72 and the roller surface. After the limiting frame 7 moves to its maximum distance, the square electromagnet 64 is automatically de-energized (the energizing time of the square electromagnet 64 can be set by the program). The repulsive force on the block magnet 703 disappears. Under the action of the elastic restoring force, the plastic spring 62 pulls the limiting slider 76 and the limiting frame 7 back to the initial position. The meshing gear 77 disengages from the rack tooth 63. The monitoring roller 71 separates from the wiping roller 101 again, and the distance between them returns to the original distance. At the same time, the thrust acting on the wiping roller 101 disappears. The moving slider 102 and the wiping roller 101 automatically reset under the elastic force of the spring part 103. The monitoring roller 71 returns to the normal joint knot monitoring state.

[0025] A method for controlling an intelligent tension control device used in yarn production specifically includes the following steps: S1: Normal yarn passes through the monitoring roller 71. The yarn drives the monitoring roller 71 to rotate through friction. The monitoring roller 71 drives the rotating shaft 731 to rotate through the ball bearing 733 and the limiting groove 732. The rotating shaft 731 drives the annular panel 79 and the fixed frame 791 to rotate. The strip slider 792 and the arc panel 793 expand outward under the action of centrifugal force. The arc panel 793 pushes the trigger shaft 702 to press the button 701. The button 701 remains in the on state. The square electromagnet 64 is de-energized. The limiting frame 7 is in the initial position under the action of the plastic spring 62. The monitoring roller 71 remains separated from the wiping roller 101. S2: When the splice knot on the yarn moves to the monitoring roller 71, the splice knot squeezes the cross thread groove 72 and generates an axial component force, which pushes the monitoring roller 71 to move axially along the limiting slide groove 732. The end of the monitoring roller 71 pushes the elastic metal sheet 74 on the corresponding side, causing one of the elastic metal sheets 74 to trigger the sensing element 75. S3: After the sensing element 75 is triggered, it outputs an electrical signal, which energizes the annular electromagnet 82 inside the demagnetizing sleeve 81. The annular electromagnet 82 generates a repulsive force on the iron panel 83. The iron panel 83 pushes the damping rubber block 85 to press it against the arc-shaped friction pad 9 through the steel shaft 84, mechanically locking the tension rod 2 and preventing the tension rod 2 from swinging due to the impact of the joint lug. After the joint lug passes through the monitoring roller 71, the elastic metal sheet 74 pushes the monitoring roller 71 to reset and disengage from the sensing element 75. After the joint lug passes through the tension rod 2, the annular electromagnet 82 is de-energized, and the damping rubber block 85 separates from the arc-shaped friction pad 9 under the action of the reset spring 86, and the tension rod 2 returns to its free swing state. S4: When the surface of the monitoring roller 71 is contaminated with pollutants, causing the rotation speed to decrease, the centrifugal force decreases, causing the arc panel 793 and the strip slider 792 to retract into the fixed frame 791, triggering the shaft 702 to descend, the button 701 to disengage, the square electromagnet 64 to be energized and generate a repulsive force on the block magnet 703, pushing the limiting frame 7 to move along the guide groove 61, the plastic spring 62 is stretched, the meshing gear 77 meshes with the strip tooth row 63 and drives the rotating shaft 731 and the monitoring roller 71 to rotate, the monitoring roller 71 moves to contact the wiping roller 101, and the wiping roller 101 wipes and cleans the surface of the monitoring roller 71 with a certain pressure under the action of the spring part 103; S5: After the limiting frame 7 moves to the end, the square electromagnet 64 is de-energized, the repulsive force disappears, the plastic spring 62 pulls the limiting frame 7 to reset, the monitoring roller 71 disengages from the wiping roller 101, the meshing gear 77 separates from the rack tooth 63, and the moving slider 102 and the wiping roller 101 reset under the action of the spring part 103, restoring the normal joint knot monitoring state.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An intelligent tension control device for yarn production, characterized in that, The device includes a servo tensioner (1), a tension rod (2) disposed on one side of the servo tensioner (1), and a main shaft (3) rotatably connected to the servo tensioner (1) mounted on the side wall of the servo tensioner (1). One end of the tension rod (2) is fixedly connected to the main shaft (3), and a rotating rod frame (4) rotatably connected to the servo tensioner (1) is mounted on the side wall of the servo tensioner (1). A tension spring (5) is connected between the tension rod (2) and the rotating rod frame (4). An assembly frame (6) is fixedly installed on the outer wall of the servo tensioner (1), and a limit frame (7) is provided inside the assembly frame (6). A monitoring roller (71) is provided inside the limit frame (7), and a cross threaded groove (72) is provided on the surface of the monitoring roller (71). A connecting part (73) is provided between the limiting frame (7) and the monitoring roller (71). Multiple elastic metal sheets (74) are fixedly installed on the inner walls of both ends of the limiting frame (7). The multiple elastic metal sheets (74) are in contact with the ends of the monitoring roller (71). A sensing element (75) is fixedly installed on the inner walls of both ends of the limiting frame (7). The sensing element (75) is located on the movement trajectory of one of the elastic metal sheets (74). A limiting unit (8) is provided on the tension rod (2). The limiting unit (8) is used to control the movement state of the tension rod (2).

2. The intelligent tension control device for yarn production according to claim 1, characterized in that: The connecting part (73) includes a rotating shaft (731) that is rotatably connected to the inner walls of both ends of the limiting frame (7) via a bearing, and multiple limiting grooves (732) are symmetrically opened on the rotating shaft (731). Multiple balls (733) are embedded in the inner walls of both ends of the monitoring roller (71), and the balls (733) correspond one-to-one with the limiting grooves (732) and slide along their trajectory. Limiting sliders (76) are fixedly installed at both ends of the limiting frame (7).

3. The intelligent tension control device for yarn production according to claim 2, characterized in that: The assembly frame (6) is provided with guide grooves (61) on both sides. The limiting slider (76) is located in the guide groove (61) and is slidably connected to it. A plastic spring (62) is connected between the limiting slider (76) and the inner wall of the guide groove (61).

4. The intelligent tension control device for yarn production according to claim 3, characterized in that: The limiting unit (8) includes a demagnetizing sleeve (81) fixedly installed on the tension rod (2), and an annular electromagnet (82) fixedly installed inside the demagnetizing sleeve (81). The annular electromagnet (82) is electrically connected to the sensing element (75), and an iron panel (83) that is slidably connected to the inner wall of the demagnetizing sleeve (81) is also provided on one side of the annular electromagnet (82). A steel shaft (84) is also fixedly installed on the iron panel (83); one end of the steel shaft (84) passes through... A damping rubber block (85) is fixedly installed on the inner wall of the demagnetizing sleeve (81) and extends to the outside. A reset spring (86) is connected between the damping rubber block (85) and the outer wall of the demagnetizing sleeve (81). An arc-shaped friction pad (9) is fixedly installed on the side wall of the servo tensioner (1). When the annular electromagnet (82) is energized, it generates a magnetic force on the iron panel (83). The iron panel (83) makes the damping rubber block (85) and the arc-shaped friction pad (9) come into close contact through the steel shaft (84).

5. The intelligent tension control device for yarn production according to claim 4, characterized in that: One end of the rotating shaft (731) passes through one of the limiting sliders (76) and extends to the outside, and is fixedly installed with a meshing gear (77); another limiting slider (76) is also fixedly installed with an annular frame (78), and an annular panel (79) is provided inside the annular frame (78); the other end of the rotating shaft (731) passes through the limiting slider (76) and is fixedly connected with the annular panel (79); multiple fixed frames (791) are fixedly installed on the annular panel (79), and each fixed frame (791) is installed with a strip slider (792) that is slidably connected to its inner wall; one end of the strip slider (792) is located outside the fixed frame (791) and is fixedly installed with an arc-shaped panel (793); a spring body (794) is connected between the strip slider (792) and the inner wall of the fixed frame (791).

6. The intelligent tension control device for yarn production according to claim 5, characterized in that: A support frame (70) is fixedly installed on the top of the annular frame (78). A button (701) is fixedly installed on the inner wall of the top of the support frame (70), and a trigger shaft (702) is provided below the button (701). One end of the trigger shaft (702) passes through the inner wall of the support frame (70) and extends into the interior of the annular frame (78). The trigger shaft (702) is located on the movement trajectory of the arc panel (793).

7. The intelligent tension control device for yarn production according to claim 6, characterized in that: A strip toothed row (63) is provided above the meshing gear (77). The strip toothed row (63) is fixedly installed on the outer wall of one side of the assembly frame (6). During the limited sliding process of the limiting slider (76) along the trajectory of the guide groove (61), the meshing gear (77) meshes with the strip toothed row (63).

8. The intelligent tension control device for yarn production according to claim 7, characterized in that: A drive shaft (10) is provided on one side of the monitoring roller (71), and a wiping roller (101) made of sponge material is installed on the drive shaft (10). A movable slider (102) is also installed inside each guide groove (61) and is slidably connected to its inner wall. The drive shaft (10) and the movable slider (102) are rotatably connected. A spring part (103) is also connected between the movable slider (102) and the inner wall of the guide groove (61). When the limiting slider (76) moves in a direction within the guide groove (61), the wiping roller (101) is located on the movement trajectory of the monitoring roller (71).

9. The intelligent tension control device for yarn production according to claim 8, characterized in that: A square electromagnet (64) is symmetrically mounted on one end of the assembly frame (6), and a block magnet (703) is symmetrically mounted on one end of the limiting frame (7). The square electromagnet (64) is electrically connected to the button (701), and the square electromagnet (64) is energized to generate a repulsive force on the block magnet (703).

10. A control method for an intelligent tension control device used in yarn production, characterized in that: The intelligent tension control device for yarn production according to claim 9 specifically includes the following steps: S1: Normal yarn passes through the monitoring roller (71). The yarn drives the monitoring roller (71) to rotate through friction. The monitoring roller (71) drives the rotating shaft (731) to rotate through the ball (733) and the limiting groove (732). The rotating shaft (731) drives the annular panel (79) and the fixed frame (791) to rotate. The strip slider (792) and the arc panel (793) expand outward under the action of centrifugal force. The arc panel (793) pushes the trigger shaft (702) to press the button (701). The button (701) remains in the on state. The square electromagnet (64) is de-energized. The limiting frame (7) is in the initial position under the action of the plastic spring (62). The monitoring roller (71) and the wiping roller (101) remain separated. S2: When the splice knot on the yarn moves to the monitoring roller (71), the splice knot squeezes the cross thread groove (72) and generates an axial component force, which pushes the monitoring roller (71) to move axially along the limiting slide groove (732). The end of the monitoring roller (71) pushes the elastic metal sheet (74) on the corresponding side, causing one of the elastic metal sheets (74) to trigger the sensing element (75). S3: After the sensing element (75) is triggered, it outputs an electrical signal, which energizes the annular electromagnet (82) inside the demagnetizing sleeve (81). The annular electromagnet (82) generates a repulsive force on the iron panel (83). The iron panel (83) pushes the damping rubber block (85) to press against the arc-shaped friction pad (9) through the steel shaft (84), mechanically locking the tension rod (2) and preventing the tension rod (2) from swinging due to the impact of the joint lug. After the joint lug passes through the monitoring roller (71), the elastic metal sheet (74) pushes the monitoring roller (71) to reset and detach from the sensing element (75). After the joint lug passes through the tension rod (2), the annular electromagnet (82) is de-energized, and the damping rubber block (85) separates from the arc-shaped friction pad (9) under the action of the reset spring (86). The tension rod (2) returns to its free swing state. S4: When the surface of the monitoring roller (71) is contaminated with pollutants, causing the rotation speed to decrease, the centrifugal force decreases, causing the arc panel (793) and the strip slider (792) to retract into the fixed frame (791), triggering the shaft (702) to descend, the button (701) to disconnect, the square electromagnet (64) to be energized and generate a repulsive force on the block magnet (703), pushing the limiting frame (7) to move along the guide groove (61), the plastic spring (62) to be stretched, the meshing gear (77) to mesh with the strip tooth row (63) and drive the rotating shaft (731) and the monitoring roller (71) to rotate, the monitoring roller (71) moves to contact the wiping roller (101), and the wiping roller (101) wipes and cleans the surface of the monitoring roller (71) with a certain pressure under the action of the spring part (103); S5: After the limit frame (7) moves to the end, the square electromagnet (64) is de-energized, the repulsive force disappears, the plastic spring (62) pulls the limit frame (7) to reset, the monitoring roller (71) disengages from the wiping roller (101), the meshing gear (77) separates from the strip tooth row (63), the moving slider (102) and the wiping roller (101) reset under the action of the spring part (103), and the normal joint knot monitoring state is restored.

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