Positive tension compensation device for ECMO oxygenation film low-tension weft laying

Abstract

The invention discloses a positive tension compensation device for ECMO oxygenation film low-tension weft laying, which comprises a brushless motor, a transmission gear set, a pull-back type spring motor, a yarn storage drum and a yarn winding disc, and is characterized in that the brushless motor is connected with the pull-back type spring motor through the transmission gear set, and the pull-back type spring motor is connected with the yarn storage drum; the transmission gear set is connected with the yarn winding disc, and the yarn winding disc is connected with the yarn storage drum. The brushless motor drives the pull-back type clockwork motor to store energy through the transmission gear set and drives the yarn storage drum to rotate to achieve positive yarn storage, weft laying yarn is stored on the yarn storage drum, and the yarn winding disc assists in yarn storage through inertia of the weft laying mechanism. According to the device, a pull-back type spring motor is introduced to serve as a regulation medium, and self-adaptive compensation of yarn tension is achieved through elastic potential energy of a pull-back type spring.

Description

Technical Field

[0001] This invention belongs to the technical field of full-width weft-laying warp knitting machines, and specifically relates to an active tension compensation device for low-tension weft laying in ECMO full-width weft-laying warp knitting machines, belonging to the textile or textile machinery field. Background Technology

[0002] The fabrication of ECMO oxygenators remains a technologically monopolized process. However, with increasing demand for ECMO technology, research and development of ECMO oxygenation membranes in China is continuously progressing. Currently, oxygenation membranes are typically made of polymer materials such as polypropylene (PP), polyurethane (PU), and polytetrafluoroethylene (PTFE), as well as poly(4-methylpentene) (PMP), which offers better oxygenation performance at a lower cost. These materials possess good biocompatibility and can effectively facilitate gas exchange. However, they all share the common characteristic of poor mechanical properties, making it extremely difficult to weave membrane materials onto full-width weft-inserted warp knitting machines. Currently, the weft-laying mechanism of full-width weft-inserted warp knitting machines cannot achieve low-tension weft laying of PMP membranes.

[0003] The reason for this is that the inherent tension of the existing passive weft-laying mechanism during the weft-laying process is greater than the breaking strength of the PMP hollow fiber membrane. Furthermore, although active yarn feeding and weft-laying can significantly reduce the inherent tension of the weft-laying mechanism, uneven yarn feed inevitably occurs during the lateral movement and reversal process due to speed changes. Even with a single active yarn feeding mechanism combined with the weft-laying mechanism, uneven weft tension still occurs during the weft-laying process. Therefore, a tension compensation device is needed to regulate tension fluctuations between the weft-laying mechanism and uneven yarn feed. However, commonly used tension compensation devices in the textile industry are usually passive tension springs and shims, or semi-active tension compensation devices combining tension springs and motors. Clearly, these passive or semi-active tension compensation devices cannot achieve the on-machine weaving of ECMO oxygenated membranes.

[0004] Chinese patent document CN 107190412 A discloses a warp knitting active tension compensation device, belonging to the field of warp knitting tension adjustment. A bearing seat is provided on the frame, a shaft is fitted onto the bearing seat, and a steel plate is mounted on the shaft. A rigid tension rod is connected to the shaft via the steel plate. A coupling is provided at one end of the shaft, and a voice coil motor is connected to the shaft via the coupling. The voice coil motor is connected to a controller; the controller is connected to the main shaft of the warp knitting machine; a yarn tension testing system is connected to an encoder; and the encoder is connected to the controller. This invention first measures the warp tension fluctuation using a resistance strain gauge yarn tension meter. Then, based on the main peak positions and peak values ​​in the yarn tension measurement results, the controller adjusts the rotation of the voice coil motor to change the magnitude of the vertical swing angular displacement θ of the rigid tension rod, reducing the peaks and making the warp tension change more uniformly, thereby changing the warp compensation amount and achieving active compensation of the warp tension. This technical solution is a tension rod-type yarn tension compensation device suitable for collective compensation of warp tension. The pre-weaving preparation work includes the warping process, so the difference between the warp feed amount and the required yarn amount at each warp head is not significant. This can be compensated collectively by adjusting the yarn path size using a tension bar. However, in ECMO full-width weft-laying equipment, the weft yarn is commonly made of PMP hollow fiber membrane. The material strength is insufficient for warping and other processes, resulting in variations in tension for each weft yarn during weft laying. Tension bar-type tension compensation devices cannot meet the need for precise compensation for individual yarns.

[0005] Therefore, in response to the weaving problem of oxygenated membrane on full-width weft-inserting warp knitting machines, an active tension compensation device is proposed to work in conjunction with the weft laying mechanism. This device can be installed on the weft laying mechanism to perform tension compensation on a single yarn, thus solving the problem of PMP hollow fiber membrane breakage and deformation caused by tension issues during the weft laying process. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an active tension compensation device for low-tension weft laying of ECMO oxygen membranes, which can be installed on the weft laying mechanism to perform tension compensation for a single yarn, thereby overcoming the problem of insufficient control accuracy of existing tension compensation devices.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: An active tension compensation device for low-tension weft laying of ECMO oxygen membranes includes a brushless motor, a transmission gear set, a pull-back spring motor, a yarn storage drum, and a yarn winding disc. The brushless motor is connected to the pull-back spring motor via the transmission gear set, and the pull-back spring motor is connected to the yarn storage drum. The transmission gear set is connected to the yarn winding disc, and the yarn winding disc is connected to the yarn storage drum. The brushless motor drives the pull-back spring motor to store energy through the transmission gear set, and drives the yarn storage drum to rotate, thus achieving active yarn storage, allowing the laid-back yarn to be stored on the yarn storage drum. The yarn winding disc utilizes the inertia of the weft laying mechanism to assist in yarn storage.

[0008] Using the above technical solution, the forward rotation of the brushless motor can drive the forward rotation of the transmission gear set to drive the pull-back spring motor to store energy. When it stops, the ratchet gear in the transmission gear set can be controlled to unlock the pull-back spring motor, enabling the gear set to reverse. Gear four is linked to the pull-back spring motor through upper and lower fixed plates. At the same time, the pull-back spring motor is connected to the yarn winding disc, allowing the brushless motor to drive the yarn storage drum to rotate through the transmission gear set, achieving positive yarn storage. The weft yarn is stored on the yarn storage drum, and the yarn winding disc uses the inertia of the weft laying mechanism to assist in yarn storage. The pull-back spring motor is introduced as a control medium, and the elastic potential energy of the pull-back spring achieves adaptive compensation for yarn tension. Compared with the motor directly driving to change the yarn feed, the pull-back spring motor, as an intermediate transition, can achieve positive tension compensation by controlling the elastic potential energy of the pull-back spring motor to adaptively adjust the yarn tension while the motor drives the yarn storage.

[0009] Preferably, the system also includes a motor controller and a tension sensor, wherein the motor controller is connected to both the brushless motor and the tension sensor. The control output is calculated based on the error between the tension sensor feedback and the set value. Specifically, the required motor drive signal is calculated using PID control based on the analog signal fed back from the tension sensor. The control algorithm adjusts the speed or torque of the brushless motor according to the error between the set target tension and the actual measured tension, thereby adjusting the yarn feed while simultaneously utilizing the elastic potential energy of the pull-back spring motor to compensate for the tension.

[0010] Preferably, the pull-back spring motor is mounted on the gear set base, and the yarn storage drum is connected to the gear set base, thereby connecting the pull-back spring motor to the yarn storage drum.

[0011] Preferably, the transmission gear set includes a ratchet gear, gear two, gear three, gear four, and gear five. The brushless motor is connected to the ratchet gear. The ratchet gear meshes with gear two. Gear two meshes with gear three and gear four respectively. Gear three and gear four both mesh with gear five. The ratchet gear is a one-way ratchet.

[0012] Preferably, the pull-back mainspring motor has a pull-back mainspring motor slot at one end and a pull-back mainspring motor buckle at the other end; the pull-back mainspring motor connects to the gear five by engaging with the pull-back mainspring motor buckle on the gear five base through the pull-back mainspring motor slot; simultaneously, the pull-back mainspring motor is connected to the gear five by engaging with the pull-back mainspring motor buckle in the base pull-back mainspring motor slot on the gear set base. The pull-back mainspring motor slot is located inside the pull-back mainspring motor to prevent the pull-back mainspring motor from being damaged by excessive contraction during the forward rotation of the motor.

[0013] Preferably, the ratchet gear is connected to the motor shaft of the brushless motor via a keyway structure. The ratchet gear is connected to the ratchet base wheel via a torque spring through a shaft hole structure. The forward rotation of the brushless motor drives the ratchet gear to rotate, and the ratchet gear meshes with the ratchet teeth, causing the ratchet base wheel to rotate forward, which in turn drives the ratchet gear to rotate forward, thereby realizing the forward rotation of the transmission gear set and storing elastic potential energy for the pull-back spring motor. When the ratchet gear stops rotating, the elastic potential energy stored in the pull-back spring motor drives the ratchet gear to rotate in reverse, realizing the reverse rotation of the transmission gear set. The torque spring includes a torque spring shaft and a torque spring shaft hole, and the ratchet gear is connected to the ratchet base wheel through the shaft hole structure of the torque spring shaft and the torque spring shaft hole.

[0014] Preferably, the internal teeth of gear two mesh with the external teeth of gear four, the external teeth of gear two mesh with gear three, and the internal teeth of gear four mesh with the external teeth of gear five; the gear three shaft of gear three is connected to the gear three slot hole provided on the rear cover of the gear set; during reverse rotation, the trajectory of the gear three slot hole moves upward and meshes with the external teeth of gear five.

[0015] Preferably, after the yarn storage drum is connected to the yarn winding disc, it is fixed in the top shaft of gear five by a roller bearing to form a free end that can rotate freely; the yarn storage drum is provided with a tension spring, and the yarn winding disc has a yarn inlet and a yarn groove. The yarn passes through the yarn groove of the yarn winding disc, passes through the yarn inlet of the yarn winding disc, and then passes parallel to the tension spring.

[0016] Preferably, the yarn storage drum has an internal gear ring and a planetary gear structure inside. The planetary gear structure includes at least one planetary gear and a sun gear. The planetary gear meshes with the internal gear ring. The sun gear is coaxially connected to the internal gear ring. The yarn storage drum meshes with the planetary gears through a bottom gear ring. The internal gear ring is driven by the planetary gear structure, thereby causing the yarn storage drum to rotate in the same direction as the sun gear. A shaft is provided on one side of the sun gear, and the shaft is used to tighten a pull-back spring motor.

[0017] Preferably, the brushless motor is connected to the ratchet gear via a motor shaft, and a locking sleeve is provided on one side of the ratchet gear to fix the motor shaft and the ratchet gear. The motor controller drives the MCU control algorithm to adopt PID tension control, which calculates the control output based on the error between the tension sensor feedback and the set value. The algorithm here is existing technology and is a commonly used tension loop algorithm based on PID control for textile tension compensation. It is mainly implemented using embedded C language to adjust the yarn tension by adjusting the motor speed. This algorithm compares the tension sensor feedback with the set value, calculates the PID, and outputs a speed command to the motor driver. It adds a tension dead zone to the original algorithm, so that the motor does not accept the drive signal when the yarn tension is within the target tension range.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) A pull-back spring motor is introduced as a control medium, and the elastic potential energy of the pull-back spring is used to achieve adaptive compensation of yarn tension. Compared with the direct drive of the motor to change the amount of yarn fed, this invention designs a pull-back spring motor as an intermediate transition, which can realize the motor drive to feed yarn while the elastic potential energy of the pull-back spring motor is controlled to adaptively adjust the yarn tension. (2) The analog signal fed back by the tension sensor is used to calculate the required motor drive signal by PID control. The control algorithm adjusts the speed or torque of the motor according to the error between the set target tension and the actual measured tension; while adjusting the yarn feed, the elastic potential energy of the pull-back spring motor is used to compensate for the tension. Attached Figure Description

[0019] Figure 1 The structure of the active tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention is shown below. Figure 1 ; Figure 2 The structure of the active tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention is shown below. Figure 2 ; Figure 3 The structure of the active tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention is shown below. Figure 3 ; Figure 4 The structure of the transmission gear set of the active tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention. Figure 1 ; Figure 5 The structure of the transmission gear set of the active tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention. Figure 2 ; Figure 6The structure of gear five in the transmission gear set of the active tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention. Figure 1 ; Figure 7 The structure of gear five in the transmission gear set of the active tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention. Figure 2 ; Figure 8 The present invention relates to a brushless motor structure for the transmission gear set of an active tension compensation device for low-tension weft laying of ECMO oxygen membranes. Figure 1 ; Figure 9 The present invention relates to a brushless motor structure for the transmission gear set of an active tension compensation device for low-tension weft laying of ECMO oxygen membranes. Figure 2 ; Figure 10 The structure of the ratchet gear of the transmission gear set of the active tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention. Figure 1 ; Figure 11 The structure of the ratchet gear of the transmission gear set of the active tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention. Figure 2 ; Figure 12 This is a ratchet structure diagram of the ratchet gear of the transmission gear set of the positive tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention. Figure 13 This is a diagram showing the torque spring structure of the ratchet gear in the transmission gear set of the active tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention. Figure 14 This is a structural diagram of the gear set base of the transmission gear set of the active tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention. Figure 15 This is a structural diagram of the gear set rear cover of the transmission gear set of the active tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention. Figure 16 The structure of the yarn storage drum of the active tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention. Figure 1 ; Figure 17 The structure of the yarn storage drum of the active tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention. Figure 2 ; Figure 18 The structure of the yarn storage drum of the active tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention. Figure 3 ; Figure 19 The structure of the yarn storage drum of the active tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention. Figure 3 ; Figure 20 This is a structural diagram of the yarn winding disc of the positive tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention. Figure 21 This is a structural diagram of the tension spring in the active tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention. Figure 22 This is a structural diagram of the pull-back spring motor of the active tension compensation device for low-tension weft laying of ECMO oxygen membrane according to the present invention. Figure 23 This invention relates to the tension compensation principle of the active tension compensation device for low-tension weft laying of ECMO oxygenated membranes. Wherein: 1- Yarn winding disc; 101- Yarn inlet of yarn winding disc; 102- Yarn groove of yarn winding disc; 2- Yarn storage drum; 201- Tension spring threaded shaft hole; 202- Yarn storage drum planetary gear structure gear ring; 203- Yarn groove of yarn storage drum; 204- Planetary gear; 205- Sun gear; 3- Transmission gear set; 301- Ratchet gear; 3011- Torque spring; 30111- Torque spring shaft one; 30112- Torque spring shaft two; 30113- Torque spring shaft hole one; 3012- Ratchet shaft; 3013- Ratchet bottom wheel; 3014- Ratchet; 3015- Ratchet; 3016- Ratchet shaft hole; 302- Gear two; 3021- External tooth of gear two; 3022- Internal tooth of gear two; 303- Gear three; 304- Gear four; 3041- External tooth of gear four; 3042- Tooth 4-Gear 5 (internal gear); 305-Gear 5 (internal gear); 3051-Gear 5 (top shaft); 3052-Gear 5 (external gear); 3053-Gear 5 (internal gear); 3054-Gear 5 (base shaft); 3055, 3056-Gear 5 (base pull-back spring motor slot); 4-Tension spring; 401-Tension spring thread; 5-Brushless motor; 501-Motor shaft; 502-Slot key; 6-Pull-back spring motor; 601-Pull-back spring motor slot; 602-Pull-back spring motor buckle; 7-Gear set rear cover; 701-Planetary gear shaft hole; 702-Gear 5 (external gear shaft hole); 703-Gear 3 (slot hole); 8-Gear set base; 801-Gear 1 (shaft hole); 802-Gear 2 (shaft hole); 803-Gear 4 (shaft hole); 804-Gear 5 (base shaft hole); 805-Pull-back spring motor slot. Detailed Implementation

[0020] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present invention more clearly, and should not be used to limit the scope of protection of the present invention.

[0021] Example: This active tension compensation device for low-tension weft laying of ECMO oxygenated membranes, such as... Figures 1-3 As shown, the device includes a brushless motor 5, a transmission gear set 3, a pull-back spring motor 6, a gear set base 8, a gear set rear cover 7, a yarn storage drum 2, and a yarn winding disc 1. The brushless motor 5 is located on one side of the gear set base 8, and the motor shaft passes through the gear set base 8 and is connected to the transmission gear set 3. The brushless motor 5 is connected to the pull-back spring motor 6 through the transmission gear set 3, and the pull-back spring motor 6 is connected to the yarn storage drum 2. The transmission gear set 3 is connected to the yarn winding disc 1, and the yarn winding disc 1 is connected to the yarn storage drum 2. The brushless motor 5 drives the pull-back spring motor 6 to store energy through the transmission gear set 3, and drives the yarn storage drum 2 to rotate to achieve positive yarn storage, so that the weft yarn is stored on the yarn storage drum 2. The yarn winding disc 1 uses the inertia of the weft laying mechanism to assist in yarn storage. The pull-back spring motor 6 is located on the gear set base 8, and the yarn storage drum 2 is connected to the gear set base 8, thereby connecting the pull-back spring motor 6 to the yarn storage drum 2.

[0022] like Figures 4-5 As shown, the transmission gear set 3 includes a ratchet gear 301, a second gear 302, a third gear 303, a fourth gear 304, and a fifth gear 305. The brushless motor 5 is connected to the ratchet gear 301 via a motor shaft 501. A locking sleeve is provided on one side of the ratchet gear 301 to fix the motor shaft 501 and the ratchet gear 301. The ratchet gear 301 meshes with the second gear 302, the second gear 302 meshes with the third gear 303 and the fourth gear 304, and both the third gear 303 and the fourth gear 304 mesh with the fifth gear 305. Figure 22 As shown, the pull-back mainspring motor 6 has a pull-back mainspring motor slot 601 at one end and a pull-back mainspring motor buckle 602 at the other end; the pull-back mainspring motor 6 is connected to the gear 5 305 through the pull-back mainspring motor slot 601 and the pull-back mainspring clamps 3055 and 3056 of the gear 5 base; the pull-back mainspring motor 6 is connected to the gear 5 305 through the pull-back mainspring motor slot 805 on the gear set base 8 and the pull-back mainspring motor buckle 602; the pull-back mainspring motor slot 601 is set in the pull-back mainspring motor 6 to prevent the pull-back mainspring motor from being damaged due to excessive contraction during the forward rotation of the brushless motor 5.

[0023] like Figures 10-13As shown, the ratchet gear 301 is a one-way ratchet; it includes a ratchet 3015, a ratchet tooth 3014, and a ratchet base wheel 3013; the ratchet base wheel 3013 is provided with a ratchet shaft hole 3016; the ratchet tooth 3014 is connected to the ratchet base wheel 3013 through the ratchet shaft hole 3016 via a ratchet shaft 3012; the ratchet gear 301 is fixedly connected to the motor shaft 501 of the brushless motor 5 via a slot key 502; the ratchet gear 301 is connected to the ratchet base wheel 3013 via a shaft hole structure through a torque spring shaft 3011 and a torsion spring shaft hole 30113; the torque spring shaft 3011 includes a torque spring shaft one 30111 and a torque spring shaft two 30112, which are respectively connected to the corresponding... Two torsion spring shaft holes 30113 connect to enable the ratchet gear 301 to connect with the ratchet bottom wheel 3013. The function of the torsion spring 3011 is to ensure that the ratchet 3015 and ratchet 3014 are engaged by force during the reverse rotation of the brushless motor 5 driving the ratchet 3015. The internal teeth 3022 of the second gear mesh with the external teeth 3041 of the fourth gear, the external teeth 3021 of the second gear mesh with the third gear 303, and the internal teeth 3042 of the fourth gear mesh with the external teeth 3051 of the fifth gear. The gear shaft of the third gear 303 is connected to the gear three slot hole 703 provided on the gear set rear cover 7. During the reverse rotation, the gear three slot hole 703 moves upward and meshes with the external teeth 3051 of the fifth gear.

[0024] like Figures 6-7 As shown, the gear 5 305 includes a gear 5 top shaft 3051, a gear 5 external gear 3052, a gear 5 internal gear 3053, a gear 5 base shaft 3054, and gear 5 base pull-back spring retainers 3055 and 3056. The gear 5 external gear 3052 and gear 5 internal gear 3053 are coaxially connected. The gear 5 external gear 3052 is provided with a gear 5 top shaft 3051 for connecting the yarn storage drum 2. The gear 5 internal gear 3053 is provided with a gear 5 base shaft 3054 and gear 5 base pull-back spring retainers 3055 and 3056. The gear 5 305 is connected to the gear set base 8 through the gear 5 base shaft 3054, and the gear 5 305 is connected to the pull-back spring motor 6 through the gear 5 base pull-back spring retainers 3055 and 3056.

[0025] like Figures 8-9 As shown, the brushless motor 5 rotates forward, driving the ratchet gear 301 to rotate, which in turn meshes with the ratchet teeth 3014 of the ratchet gear 3013, causing the bottom ratchet wheel 3013 to rotate forward, i.e., the ratchet gear 301 rotates forward. Figures 4-13As shown, the external teeth 3021 and internal teeth 3022 of gear two are coaxially connected to form gear two 302; the external teeth 3041 and internal teeth 3042 of gear four are coaxially connected to form gear four 304; the ratchet gear 301 drives gear two 302 to rotate forward, the internal teeth 3022 of gear two mesh with the external teeth 3041 of gear four, and the internal teeth 3042 of gear four mesh with the external teeth 3051 of gear five, realizing the forward rotation of the transmission gear set 3; the elastic potential energy stored by the pull-back spring motor 6 drives the ratchet 3015 of the ratchet gear 301 to rotate in reverse, realizing the reverse rotation of the transmission gear set 3.

[0026] like Figure 15 As shown, the gear set rear cover 7 is provided with three planetary gear shaft holes 701, gear five external gear shaft hole 702 and gear three slot hole 703. The three planetary gear shaft holes 701 are connected to the planetary gear structure, the gear five external gear shaft hole 702 is connected to the shaft of gear five 305, and the gear three slot hole 703 is used to connect gear three 303.

[0027] like Figure 14 As shown, the gear set base 8 is provided with a gear one shaft hole 801, a gear two shaft hole 802, a gear four shaft hole 803, a gear five base shaft hole 804, and a pull-back spring motor slot 805. The gear one shaft hole 801 is used to connect gear one 301; the gear two shaft hole 802 is used to connect gear two 302; the gear four shaft hole 803 is used to connect gear four 304; and the gear five base shaft hole 804 is used to connect gear five 305. The pull-back spring motor slot 805 and the gear five base pull-back spring retaining posts 3055 and 3056 cooperate to connect the pull-back spring motor 6.

[0028] like Figures 16-19 As shown, the yarn storage drum 2 is connected to the yarn winding disc 1 and then fixed in the top shaft 3051 of the gear five via roller bearings, forming a freely rotatable end; the yarn storage drum 2 is equipped with a tension spring 4, such as... Figure 20 As shown, the winding disc 1 has a yarn inlet 101 and a yarn groove 102. The yarn passes through the yarn groove 102 of the winding disc 1, through the yarn inlet 101 of the winding disc 1, and then parallel to the tension spring 4. Figure 21 As shown, the tension spring 4 is provided with a tension spring thread 401, which is used to connect the tension spring 4 with the tension spring thread shaft hole 201.

[0029] like Figure 16 , 17As shown, the yarn storage drum 2 has an internal gear ring 202 and a planetary gear structure inside. The planetary gear structure includes three planetary gears 204 and a sun gear 205. The three planetary gears 204 are evenly distributed on a circular plane, and the planetary gears 204 mesh with the internal gear ring 202. The sun gear 205 is coaxially connected to the internal gear ring 202. The yarn storage drum 2 meshes with the planetary gears 204 through a bottom gear ring. The planetary gear structure drives the internal gear ring 202, thereby causing the yarn storage drum 2 to rotate in the same direction as the sun gear 205. A shaft is provided on one side of the sun gear 205, and the shaft is used to tighten the pull-back type spring motor 6. Figure 18 As shown, the yarn storage drum 2 is also provided with a tension spring threaded shaft hole 201 for connecting the tension spring 4, and a yarn storage drum groove 203 for storing yarn. The planetary gear structure realizes on the one hand the brushless motor 5 drives the yarn storage drum 2 to rotate to store and tension the yarn, and on the other hand, it controls the tension of the pull-back spring motor 6 to actively regulate tension fluctuations.

[0030] The active tension compensation device for low-tension weft laying of ECMO oxygenated membranes also includes a motor controller and a tension sensor. The motor controller is connected to both the brushless motor and the tension sensor. The motor controller drives an MCU control algorithm that employs PID tension control, calculating the control output based on the error between the tension sensor feedback and the set value. The MCU's primary function is forward rotation, driving a unidirectional ratchet. The control output is calculated based on the error between the tension sensor feedback and the set value; that is, the required motor drive signal is calculated using PID control based on the analog signal from the tension sensor. The control algorithm adjusts the speed or torque of the brushless motor based on the error between the set target tension and the actual measured tension, thereby adjusting the yarn feed while utilizing the elastic potential energy of the pull-back spring motor 6 to compensate for the tension.

[0031] The yarn tension sensor transmits electrical signals to a PID motor drive, which in turn drives the brushless yarn motor 5 to rotate forward, increasing the elastic potential energy of the pull-back spring motor 6. This simultaneously enables the yarn winding function, tightening the yarn and causing the yarn storage drum 2 to begin storing yarn. The pull-back spring motor 6 provides torque to the yarn storage drum 2 to compensate for the tension of the weft-laying yarn during the weft-laying mechanism's movement. The pull-back spring motor can also be used to adjust the weaving tension. When the brushless motor 5 stops, the one-way ratchet can be unlocked, releasing the elastic potential energy of the pull-back spring motor 6. The pull-back spring motor 6 then drives the gear set to rotate in reverse, causing the yarn storage drum 2 to begin releasing yarn.

[0032] In use, the active tension compensation device for low-tension weft laying of ECMO oxygen membranes is fixed on the weft laying mechanism. A resistive yarn tension sensor is placed on the yarn path between the weft laying mechanism and the yarn feeding device, moving laterally with the weft laying mechanism. During this process, the yarn disc 1 is fixed to the top shaft 3051 of gear 5 by roller bearings, forming a freely rotatable end with a certain inertia. Utilizing the mechanism's characteristics, it can passively compensate for the yarn feeding deviation caused by the difference in weft laying speed during the left and right lateral movement of the weft laying mechanism. Active compensation is mainly achieved by the brushless motor 5. The transmission gear set 3 can be driven by the brushless motor 5 to rotate the ratchet 301 forward, increasing the elastic potential energy of the pull-back spring motor 6. While the yarn storage drum 2 rotates forward to store and wind the weft laying yarn, the torque required for the yarn storage drum 2 to release yarn increases, increasing the tension of the weft laying yarn. When the brushless motor 5 stops, the pull-back spring motor 6 becomes the enabling end, driving the transmission gear set 3 to rotate in reverse, releasing the elastic potential energy, thereby reducing the torque required for the yarn storage drum 2 to release yarn, thus reducing the tension of the weft laying yarn. The analog signal input from the yarn tension sensor is processed by a PID motor controller to design a tension range. If the tension is too high, the brushless motor 5 stops, releasing the elastic potential energy of the pull-back spring motor 6. If the tension is too low, the brushless motor 5 rotates forward, increasing the elastic potential energy of the pull-back spring motor 6. This active compensation of the weft yarn tension is achieved through the forward and stop rotation of the brushless motor 5. Figure 23 As shown, the system determines whether the reading of the tension is within the dead zone. If it is, it outputs 0 to reset the PID motor controller. If it is not, it performs normal calculations. Based on the calculation results, it sends a speed command and waits for the next cycle.

[0033] For those skilled in the art, the specific embodiments are merely illustrative descriptions of the present invention. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. An active tension compensation device for low-tension weft laying of ECMO oxygenated membranes, characterized in that, It includes a brushless motor, a transmission gear set, a pull-back spring motor, a yarn storage drum, and a yarn winding disc. The brushless motor is connected to the pull-back spring motor through the transmission gear set, and the pull-back spring motor is connected to the yarn storage drum. The transmission gear set is connected to the yarn winding disc, and the yarn winding disc is connected to the yarn storage drum.

2. The active tension compensation device for low-tension weft laying of ECMO oxygenated membranes according to claim 1, characterized in that, It also includes a motor controller and a tension sensor, the motor controller being connected to the brushless motor and the tension sensor respectively.

3. The active tension compensation device for low-tension weft laying of ECMO oxygenated membranes according to claim 1, characterized in that, The pull-back spring motor is mounted on the gear set base, and the yarn storage drum is connected to the gear set base, thereby connecting the pull-back spring motor to the yarn storage drum.

4. The active tension compensation device for low-tension weft laying of ECMO oxygenated membranes according to claim 3, characterized in that, The transmission gear set includes a ratchet gear, gear two, gear three, gear four, and gear five. The brushless motor is connected to the ratchet gear. The ratchet gear meshes with gear two. Gear two meshes with gear three and gear four respectively. Gear three and gear four both mesh with gear five.

5. The active tension compensation device for low-tension weft laying of ECMO oxygenated membranes according to claim 4, characterized in that, One end of the pull-back mainspring motor is provided with a pull-back mainspring motor slot, and the other end is provided with a pull-back mainspring motor buckle; the pull-back mainspring motor is connected to the gear five by cooperating with the pull-back mainspring motor buckle of the gear five base through the pull-back mainspring motor slot; at the same time, the pull-back mainspring motor is connected by cooperating with the pull-back mainspring motor buckle through the base pull-back mainspring motor slot on the gear set base.

6. The active tension compensation device for low-tension weft laying of ECMO oxygenated membranes according to claim 4, characterized in that, The ratchet gear is connected to the motor shaft of the brushless motor via a slotted key structure. The ratchet gear is connected to the ratchet base wheel via a shaft hole structure and a torque spring. The forward rotation of the brushless motor drives the ratchet gear to rotate, and the ratchet gear meshes with the ratchet teeth, causing the ratchet base wheel to rotate forward, which in turn drives the ratchet gear to rotate forward, thereby realizing the forward rotation of the transmission gear set and storing elastic potential energy for the pull-back spring motor. When the ratchet gear stops rotating, the elastic potential energy stored in the pull-back spring motor drives the ratchet gear to rotate in reverse, realizing the reverse rotation of the transmission gear set.

7. The active tension compensation device for low-tension weft laying of ECMO oxygenated membranes according to claim 6, characterized in that, The internal teeth of gear 2 mesh with the external teeth of gear 4, the external teeth of gear 2 mesh with gear 3, and the internal teeth of gear 4 mesh with the external teeth of gear 5. The gear shaft of gear 3 is connected to the gear slot on the rear cover of the gear set. During reverse rotation, the track of the gear slot moves upward and meshes with the external teeth of gear 5.

8. The active tension compensation device for low-tension weft laying of ECMO oxygenated membranes according to claim 4, characterized in that, After being connected to the winding disc, the yarn storage drum is fixed in the top shaft of gear five by a bearing to form a free end that can rotate freely; the yarn storage drum is provided with a tension spring, and the winding disc has a yarn inlet and a yarn groove. The yarn passes through the yarn groove of the winding disc, through the yarn inlet of the winding disc, and then passes parallel to the tension spring.

9. The active tension compensation device for low-tension weft laying of ECMO oxygenated membranes according to claim 4, characterized in that, The yarn storage drum has an internal gear ring and a planetary gear structure inside. The planetary gear structure includes at least one planetary gear and a sun gear. The planetary gears mesh with the internal gear ring. The sun gear is coaxially connected to the internal gear ring. The yarn storage drum meshes with the planetary gears through a bottom gear ring. The internal gear ring is driven by the planetary gear structure, thereby causing the yarn storage drum to rotate in the same direction as the sun gear. A shaft is provided on one side of the sun gear, and the shaft is used to tighten the pull-back spring motor.

10. The active tension compensation device for low-tension weft laying of ECMO oxygenated membranes according to claim 9, characterized in that, The brushless motor is connected to the ratchet gear via a motor shaft. A locking sleeve is provided on one side of the ratchet gear to fix the motor shaft and the ratchet gear. The motor controller drives the MCU control algorithm to use PID tension control, which calculates the control output based on the error between the tension sensor feedback and the set value.

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