Passive sectional yarn feeding spandex conveying frame

Abstract

The invention relates to the technical field of weaving machine accessories, and discloses a passive segmented yarn feeding spandex conveying frame which comprises a machine body, driving shafts are arranged on the two sides of the machine body respectively, each driving shaft comprises a hollow core shaft installed on the machine body, one or more stators are fixed to each hollow core shaft, and rotors are arranged on the outer sides of the stators in a sleeving mode. A yarn feeding roller is fixed on the outer side of the rotor; the two ends of the yarn feeding roller are rotationally connected with the hollow mandrel through yarn feeding roller bearings, a swing rod frame is fixed to the bottom of the machine body, and swing rod shafts are arranged on the two sides of the end of the swing rod frame respectively. Swing rods corresponding to the yarn feeding rollers in number are rotationally arranged on the swing rod shaft, a roller shaft is arranged at the end of each swing rod and rotationally connected with a roller through a roller bearing, and the roller is sleeved with the spandex yarn barrel. Each spandex yarn drum is provided with an independent motor driving system, the speed and tension of each spandex yarn drum can be independently adjusted, a traditional synchronous belt transmission mode is abandoned, space is saved, and maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of loom accessories, and particularly to a passive segmented yarn feeding spandex conveyor rack. Background Art

[0002] The spandex rack is an important component in textile machinery (such as circular knitting machines), used to control and convey spandex yarns to ensure the elasticity and quality of fabrics. Currently, most spandex racks adopt a synchronous pulley and synchronous belt drive method, that is, a main motor drives a synchronous pulley, and then the synchronous belt drives multiple spandex racks to rotate synchronously. Although this drive method meets the production requirements to a certain extent, there are still the following problems: 1. Since multiple spandex racks are driven by the same synchronous belt, wear, looseness or installation errors of the synchronous belt will cause the spandex racks to run out of sync, affecting the fabric quality. 2. It is difficult to achieve independent control of a single spandex bobbin with the synchronous belt drive method, and it is difficult to flexibly adjust the speed or tension of the bobbin according to production requirements. 3. The synchronous belt drive system requires a large installation space, increasing the complexity of the equipment structure. 4. The synchronous belt and synchronous pulleys need to be maintained and replaced regularly, increasing the usage cost and downtime of the equipment. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a passive segmented yarn feeding spandex conveyor rack, which is equipped with an independent motor drive system for each spandex bobbin. Each spandex bobbin can independently adjust the speed and tension, abandoning the traditional synchronous belt drive method, saving space and reducing the maintenance cost.

[0004] To achieve the above purpose, the present invention adopts the following technical solution: A passive segmented yarn feeding spandex conveyor rack, including a machine body. A circuit board is arranged inside the machine body. Driving shafts are respectively arranged on both sides of the machine body. The driving shaft includes a hollow core shaft installed on the machine body. One or more stators are fixed on the hollow core shaft. A rotor is sleeved outside the stator. A yarn feeding roller is fixed outside the rotor. Both ends of the yarn feeding roller are rotationally connected to the hollow core shaft through yarn feeding roller bearings. A swing rod frame is fixed at the bottom of the machine body. Swing rod shafts are respectively arranged on both sides of the end of the swing rod frame. Swing rods corresponding to the yarn feeding rollers in number are rotationally arranged on the swing rod shafts. A roller shaft is arranged at the end of the swing rod. A roller is rotationally connected to the roller shaft through a roller bearing. Among them, when feeding yarn, the spandex bobbin is sleeved on the roller. The swing rod swings towards the side of the yarn feeding roller, and the spandex bobbin contacts the yarn feeding roller, and the spandex yarn is conveyed under the drive of the rolling yarn feeding roller.

[0005] Further, the roller includes a cylinder body. A fixing plate is arranged on one side of the cylinder body. A plurality of hollow parts are arranged at intervals on the cylinder body. A limiting elastic sheet is arranged at one end of the hollow part away from the fixing plate. The cylinder body is also provided with a plurality of convex ribs.

[0006] Further, a bearing mounting groove is provided on the inner side of the fixed disk. A roller bearing is mounted in the bearing mounting groove. The roller bearing is sleeved on the outer side of the roller shaft. The inside of the roller shaft is a hollow structure. Fastening bolts are threadedly connected to both ends thereof. The outer ends thereof are locked to the end of the swing rod by fastening screws.

[0007] Further, the swing rod includes a sleeve sleeved on the swing rod shaft. An arm is connected to the outer side wall of the sleeve. A mounting disk is provided at the end of the arm. Reinforcing pieces are provided on the outer side surface of the arm. Two ends of each reinforcing piece are respectively connected to the sleeve and the mounting disk.

[0008] Further, a wire passing hole is provided on the hollow core shaft and is equal in number to the number of stators mounted thereon. A positioning groove is provided at the inner end of the hollow core shaft. The machine body is provided with a shaft hole adapted to the shape of the inner end of the hollow core shaft. The hollow core shaft is locked to the machine body by an inner hollow stepped screw. The electrical connection wires of the stator pass through the wire passing hole, the hollow core shaft and the inner hollow stepped screw and are electrically connected to the circuit board.

[0009] Further, the circuit board includes a power supply circuit, a plurality of motor control circuits and a communication circuit. The power supply circuit supplies power to the motor control circuits and the communication circuit. The communication circuit is connected to the motor control circuits. Each motor control circuit is connected to a stator. The knitting machine is connected to the communication circuit through a CAN bus.

[0010] Further, the motor control circuit includes a main chip and three motor driver chip circuits. The main chip is respectively connected to the signal input ends of the three motor driver chip circuits. The signal outputs of the three motor driver chip circuits are respectively connected to the three-phase lines of the stator.

[0011] Further, the motor driver chip circuit includes a motor driver chip and its peripheral circuit. The HIN pin and LIN pin of the motor driver chip are respectively used for accessing the logic input signals input by the main chip. Its VCC pin is connected to a 15V power supply. Its GND pin is grounded. The HO pin and LO pin of the motor driver chip are respectively connected to a high-side MOS transistor and a low-side MOS transistor through a first resistor and a second resistor. A first diode is also reversely connected between the HO pin of the motor driver chip U3 and the gate of the high-side MOS transistor. A second diode is also reversely connected between the LO pin of the motor driver chip and the gate of the low-side MOS transistor. Among them, the drain of the high-side MOS transistor is connected to a 155V power supply. The source of the high-side MOS transistor is connected to the output end. The drain of the low-side MOS transistor is connected to the output end. The source of the low-side MOS transistor is grounded.

[0012] Further, the power supply circuit includes a power protection circuit, a rectification circuit, a filtering circuit, a first step-down circuit, a second step-down circuit, and a third step-down circuit that are connected in sequence.

[0013] Further, the communication circuit includes a CAN communication chip and its peripheral circuit.

[0014] Beneficial Effects

[0015] Compared with the prior art, the present invention has at least the following advantages:

[0016] 1. Two pairs of stators and rotors in the present invention share a hollow core shaft, with a more compact overall structure, less occupied space, effectively saving space, and being lightweight. 2. The spandex yarn bobbin is stably sleeved on the roller through a swinging structure formed by a swing rod frame, a swing rod shaft, a swing rod, and a roller, enabling the spandex yarn bobbin to maintain a stable position during the wire feeding process, reducing the shaking or deviation of the spandex yarn bobbin. During wire feeding, there is friction between the spandex yarn bobbin and the yarn feeding roller. Under the action of the friction, the spandex yarn bobbin rotates passively as the yarn feeding roller rotates, realizing yarn feeding. The self-weight of the spandex yarn bobbin plus the weights of the swing rod and the roller can prevent the spandex yarn bobbin from jumping up due to a large increase in the rotation speed of the yarn feeding roller. 3. Multiple spandex yarn bobbins on the spandex yarn frame in the present invention are independently controlled for conveying by corresponding motors, and the speed or tension of the bobbins can be flexibly adjusted according to production requirements. 4. Compared with the synchronous belt transmission system of the prior art, the present invention does not require regular maintenance of the synchronous belt and synchronous pulley, reducing the equipment usage cost and downtime. 5. Each motor composed of a pair of stator and rotor in the present invention can be independently controlled. The knitting machine is connected to the communication circuit through the CAN bus. The communication circuit transmits control signals of the knitting machine, such as start-stop signals and rotation speed signals, to the main chips of each motor control circuit through the communication circuit, and each main chip controls the corresponding motor to perform relevant actions, enabling them to work synchronously or separately. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the present invention.

[0018] Figure 2 is a schematic right-side view structural diagram of the present invention.

[0019] Figure 3 is a schematic top view structural diagram of the present invention.

[0020] Figure 4 For the present invention Figure 3 is a schematic structural diagram of the A-A cross-section in

[0021] Figure 5 is a schematic structural diagram of the roller of the present invention.

[0022] Figure 6Schematic diagram of the connection structure between the drum and the swing rod of the present invention.

[0023] Figure 7 of the present invention Figure 6 Schematic diagram of the structure of the B-B cross-section in the present invention.

[0024] Figure 8 Schematic diagram of the structure of the hollow core shaft of the present invention.

[0025] Figure 9 Circuit principle block diagram of the present invention.

[0026] Figure 10 Circuit schematic diagram of the power supply circuit of the present invention.

[0027] Figure 11 Circuit schematic diagram of the first motor control circuit of the embodiment of the present invention.

[0028] Figure 12 Circuit schematic diagram of the second motor control circuit of the embodiment of the present invention.

[0029] Figure 13 Circuit schematic diagram of the third motor control circuit of the embodiment of the present invention.

[0030] Figure 14 Circuit schematic diagram of the fourth motor control circuit of the embodiment of the present invention.

[0031] Figure 15 Circuit schematic diagram of the communication circuit of the present invention.

[0032] Reference numerals: 1 - spandex yarn bobbin; 2 - machine body; 20 - shaft seat; 3 - swing rod frame; 30 - fixed rod; 300 - reinforcing rib; 31 - mounting part; 4 - drive shaft; 40 - hollow core shaft; 401 - wire threading hole; 402 - positioning groove; 41 - stator; 42 - rotor; 43 - yarn feeding roller bearing; 44 - spacer one; 45 - bushing; 46 - yarn feeding roller; 5 - swing rod; 50 - sleeve; 51 - swing arm; 52 - mounting disc; 53 - reinforcing piece; 6 - drum; 60 - fixed disc; 61 - cylinder body; 62 - convex rib; 63 - hollowed-out part; 64 - limiting elastic piece, 640 - inclined part; 641 - horizontal part; 65 - bearing mounting groove; 7 - hanging plate; 8 - yarn break detector; 9 - swing rod shaft; 90 - retaining ring; 10 - circuit board; 11 - drum bearing; 12 - drum shaft; 120 - convex ring; 13 - spacer two; 14 - fastening bolt; 15 - outer hollow stepped screw; 16 - inner hollow stepped screw. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the present invention more clear, the following detailed description will be given in conjunction with the accompanying drawings and specific embodiments. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to an element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0036] See Figures 1 - 15 , this embodiment provides a passive segmented yarn feeding spandex conveying rack, including a machine body 2, and a circuit board 10 is arranged inside the machine body 2. Driving shafts 4 are respectively arranged on both sides of the machine body 1. The driving shaft 4 includes a hollow core shaft 40, two stators 41 are fixed on the hollow core shaft 40, a rotor 42 is sleeved outside the stator 41, and a yarn feeding roller 46 is fixed outside the rotor 42; both ends of the yarn feeding roller 46 are rotatably connected to the hollow core shaft 40 through yarn feeding roller bearings 43. A shaft sleeve 45 sleeved on the hollow core shaft 40 is arranged between the yarn feeding roller bearing 43 and the stator 41, and a first spacer 44 sleeved on the hollow core shaft 40 is arranged between adjacent yarn feeding roller bearings 43. Axle seats 20 protrude inward from two opposite side walls of the machine body, the axle seats have axle holes, a positioning groove 401 is arranged at the inner end of the hollow core shaft 40, the shape of the axle hole is adapted to the shape of the inner end of the hollow core shaft 40, and the rotation of the hollow core shaft 40 is prevented by the arrangement of the positioning groove 401. Threads are arranged inside the inner end of the hollow core shaft 40, and it is locked on the machine body 2 through an inner hollow stepped screw 16. Threads are arranged inside the outer end of the hollow core shaft 40, and an outer hollow stepped screw 15 is threadedly connected thereto.

[0037] There are 2 wire threading holes 400 provided on the hollow mandrel 40, and the two wire threading holes 400 are respectively arranged on one side of the 2 stators. The electrical connection wires of the 2 stators 41, that is, the three-phase wires, respectively pass through the corresponding wire threading holes 400, the hollow mandrel and the inner hollow stepped screw 16 and are electrically connected to the circuit board 10.

[0038] Each pair of stator and rotor forms a motor. In this embodiment, there are four motors in total, namely the first motor, the second motor, the third motor and the fourth motor. In practice, the stator 41 is connected to three-phase electricity, and the stator 41 generates a rotating magnetic field. Under the action of this rotating magnetic field, the rotor 42 will generate an induced current, and then be subjected to the electromagnetic force and start to rotate. The rotation of the rotor 42 causes the yarn feeding roller 46 to rotate. In the technical solution of the present invention, two pairs of stators 36 and rotors 33 share a hollow mandrel 40, the overall structure is more compact, occupies less space, effectively saves space, and is light in weight. By changing the stator power supply parameters, the rotation speed and direction of the rotor can be conveniently adjusted, which is flexibly applicable to different production processes.

[0039] An arc-shaped swing rod frame 3 is fixed at the bottom of the machine body 2. The swing rod frame 3 includes a fixed rod 30 with an arc-shaped structure fixed on the machine body 2. An installation part 31 is arranged at the end of the fixed rod 30. The installation part 31 is a cylindrical structure. Swing rod shafts 9 are respectively inserted on both sides of the installation part 31. Reinforcing ribs 300 are arranged on the fixed rod 30, and the reinforcing ribs 300 are connected to the machine body and the installation part 31, playing a role in strengthening the structural strength of the swing rod frame 3.

[0040] There are 4 swing rods 5 rotatably arranged on the swing rod shaft 9. The swing rod 5 includes a sleeve 50 sleeved on the swing rod shaft 9. A swing arm 51 is connected to the outer side wall of the sleeve 20. An installation disc 52 is arranged at the end of the swing arm 51. A reinforcing piece 53 for strengthening the structural strength of the swing rod is arranged on the outer side surface of the swing arm 51. Both ends of the reinforcing piece 53 are respectively connected to the sleeve 50 and the installation disc 52. A retaining ring 90 for restricting the displacement of the swing rod 5 is arranged on the swing rod shaft 9. A roller shaft 12 is arranged at the end of the swing rod 5. The inside of the roller shaft 12 is a hollow structure, and threads are arranged on the inner sides of both ends thereof. Its outer end is locked on the installation disc 52 through a fastening screw 14. A convex ring 120 is arranged on the roller shaft 12, and the outer side surface of the convex ring 120 is in close contact with the installation disc 52. The roller shaft 12 is rotatably connected to a roller 6 through a roller bearing 11. Specifically, the roller 6 includes a cylinder body 61. A fixed disc 60 is arranged on one side of the cylinder body 61. A bearing installation groove 65 is arranged on the inner side of the fixed disc 60. The roller bearing 11 is installed in the bearing installation groove 65, and the roller bearing 11 is sleeved on the outside of the roller shaft 12. A fastening bolt 14 is threadedly connected to the inner end of the roller shaft 12. A second gasket 13 is arranged on the fastening bolt 14. The second gasket 13 abuts against the inner side of the inner ring of the roller bearing 11, and the outer side of the inner ring of the roller bearing 11 abuts against the inner side surface of the convex ring 120.

[0041] A plurality of hollow portions 63 are arranged at intervals on the cylinder body 61. A limiting elastic piece 64 is arranged at one end of the hollow portion 63 far away from the fixed disc. The other end of the limiting elastic piece 64 is a free end, and the free end is located outside the cylinder body. The limiting elastic piece 64 includes an inclined portion 640 inclined towards the outside of the cylinder body and a horizontal portion 641 arranged at the end of the inclined portion. The longitudinal cross-section of the horizontal portion 641 and the inclined portion 640 is an arc coaxial with the cylinder body 61. The cylinder body is further provided with a plurality of convex ridges 62. One end of the cylinder body 61 far away from the fixed disc 60 is in a flared structure, which is convenient for guiding the spandex yarn bobbin 1 to be sleeved in. The convex ridges 62 are inclined towards the end of the cylinder body 1 in the part above the flared structure of the fixed disc 60. When the spandex yarn bobbin 1 is sleeved on the cylinder body 61, the limiting elastic piece 64 generates a certain deformation due to elasticity, abuts against the spandex yarn bobbin, tightly fixes the spandex yarn bobbin 1 on the cylinder body 61, prevents the spandex yarn bobbin 1 from shaking or accidentally coming off on the cylinder body 61, and ensures the stability of the installation of the spandex yarn bobbin 1. The arrangement of the inclined portion of the convex ridge 62 facilitates the introduction of the cylinder body 61, and the convex ridge 62 makes the contact surface between the spandex yarn bobbin 1 and the cylinder body 61 rougher, increases the friction force, further improves the stability of the installation of the spandex yarn bobbin 1, and at the same time the convex ridge 62 can also improve the structural strength of the cylinder body 61.

[0042] The swing structure of the spandex yarn bobbin formed by the swing rod frame 3, the swing rod shaft 9, the swing rod 5 and the roller stably sleevs the spandex yarn bobbin 1 on the roller 6, so that the spandex yarn bobbin 1 maintains a stable position during the wire feeding process, reducing the shaking or deviation of the spandex yarn bobbin. When feeding yarn, the spandex yarn bobbin 1 is sleeved on the roller 6, the swing rod 5 rotates towards the side of the yarn feeding roller 46 and abuts against the yarn feeding roller 46. The spandex yarn bobbin 1 contacts the yarn feeding roller 46. The yarn feeding roller 46 rolls under the drive of the motor composed of the stator 41 and the rotor 42. There is friction between the spandex yarn bobbin 1 and the yarn feeding roller 46. Under the action of the friction, the spandex yarn bobbin 1 is driven to rotate passively as the yarn feeding roller 46 rotates, realizing yarn feeding. The self-weight of the spandex yarn bobbin 1 plus the weights of the swing rod 5 and the roller 6 can prevent the spandex yarn bobbin 1 from jumping up due to a large increase in the rotation speed of the yarn feeding roller 46.

[0043] A hanging plate 7 is arranged at the bottom of the machine body 2. A yarn break detector corresponding to the yarn feeding roller in position and quantity is hung on the hanging plate. The yarn delivered by the spandex yarn bobbin 1 on the yarn feeding roller 46 passes through the yarn break detector 8. The yarn break detector 8 is used to monitor whether the conveyed spandex yarn is broken. When the yarn is broken, the yarn break detector 8 emits a yarn break alarm signal.

[0044] The circuit board includes a power supply circuit, 4 motor control circuits and a communication circuit. The 4 motor control circuits are the first motor control circuit, the second motor control circuit, the third motor control circuit and the fourth motor control circuit respectively. The power supply circuit supplies power to the motor control circuit and the communication circuit. The communication circuit is connected to the motor control circuit. Each motor control circuit is electrically connected to a stator. Among them, the first motor control circuit is connected to the first motor, the second motor control circuit is connected to the second motor, the third motor control circuit is connected to the third motor, and the fourth motor control circuit is connected to the fourth motor. The knitting machine is connected to the communication circuit through the CAN bus.

[0045] The power supply circuit includes a power supply protection circuit, a rectification circuit, a filtering circuit, a first step-down circuit, a second step-down circuit and a third step-down circuit connected in sequence. The power supply protection circuit, the rectification circuit and the filtering circuit form a filtering circuit, which converts the input 110V alternating current into 155V direct current. The 155V direct current is converted into 15V direct current through the first step-down circuit, and the 15V direct current is converted into 5V direct current through the second step-down circuit, that is, the VCC power supply. The 5V direct current is converted into 3.3V DC power supply through the third step-down circuit.

[0046] The motor control circuit includes a main chip and three motor drive chip circuits, namely, a first motor drive chip circuit, a second motor drive chip circuit, and a third motor drive chip circuit. The main chip is respectively connected to the signal input ends of the three motor drive chip circuits, and the signal outputs of the three motor drive chip circuits are respectively connected to the three-phase lines of the stator. Among them, the signal output end of the first motor drive chip circuit is connected to the U-phase connection line among the three-phase lines of the stator, the signal output end of the second motor drive chip circuit is connected to the V-phase connection line among the three-phase lines of the stator, and the signal output end of the third motor drive chip circuit is connected to the W-phase connection line among the three-phase lines of the stator.

[0047] It should be noted that, as Figure 11 shown, in the first motor control circuit, the first motor drive chip circuit, the second motor drive chip circuit, and the third motor drive chip circuit are respectively the first first-motor drive chip circuit, the first second-motor drive chip circuit, and the first third-motor drive chip circuit. By analogy, as Figures 12 - 14 shown, in the second motor control circuit, the corresponding three motor drive chip circuits are respectively the second first-motor drive chip circuit, the second second-motor drive chip circuit, and the second third-motor drive chip circuit; in the third motor control circuit, the corresponding ones are the third first-motor drive chip circuit, the third second-motor drive chip circuit, and the third third-motor drive chip circuit. In the fourth motor control circuit, the corresponding ones are the fourth first-motor drive chip circuit, the fourth second-motor drive chip circuit, and the fourth third-motor drive chip circuit.

[0048] In the first motor control circuit, the first motor drive chip circuit includes a motor drive chip U3 and its peripheral circuit. The HIN pin and LIN pin of the motor drive chip U3 are respectively used to access the logic input signals input by the main chip U2. Its VCC pin is connected to a 15V power supply, and its GND pin is grounded; a capacitor C15 is connected between the VCC pin and the GND pin. The HO pin and LO pin of the motor drive chip U3 are respectively connected to the gate of the high-side MOS transistor Q1 and the gate of the low-side MOS transistor Q2 through a first resistor R2 and a second resistor R6. A first diode D7 is also reversely connected between the HO pin of the motor drive chip U3 and the gate of the high-side MOS transistor Q1, and a second diode D8 is also reversely connected between the LO pin of the motor drive chip U3 and the gate of the low-side MOS transistor Q2. Among them, the drain of the high-side MOS transistor Q1 is connected to a 155V power supply, the source of the high-side MOS transistor Q1 is connected to the output terminal OUTU1, the output terminal OUTU1 is connected to the VS pin of the motor drive chip U3, the drain of the low-side MOS transistor Q2 is connected to the output terminal OUTU1, and the source of the low-side MOS transistor Q2 is grounded. A third diode D6 is connected between the VCC pin and the VB pin of the motor drive chip U3, and a capacitor C14 is also connected between its VB pin and the VS pin. The motor drive chip U3 outputs signals to control the on and off states of the high-side MOS transistor Q1 and the low-side MOS transistor Q2. When HIN is at a low level, the high-side MOS transistor Q1 is turned off, and when HIN is at a high level, the high-side MOS transistor Q1 is turned on; when LIN is at a low level, the low-side MOS transistor Q2 is turned on, and when LIN is at a high level, the low-side MOS transistor is turned off. When the high-side MOS transistor Q1 is turned on and the low-side MOS transistor Q2 is turned off, the output terminal OUTU1 outputs a high level of 155V. When the high-side MOS transistor Q1 is turned off and the low-side MOS transistor Q2 is turned on, the output terminal OUTU1 outputs a low level of 0V.

[0049] In the first motor control circuit, the second motor drive chip circuit and the third motor drive chip circuit have the same structure as the first motor drive chip circuit. The connection relationship and functions of each component are the same as those of the first motor drive chip circuit, only the numbers of each component are different, so they will not be elaborated here.

[0050] In the technical solution of this embodiment, for the main chip U2 of the first motor control circuit, its pin 3 and pin 4 are respectively connected to the LIN pin and HIN pin of the motor driver chip U3 of the first motor driver chip circuit through resistors R3 and R4, its pin 5 and pin 6 are respectively connected to the LIN pin and HIN pin of the motor driver chip U4 of the second motor driver chip circuit through resistors R5 and R7, its pin 7 and pin 8 are respectively connected to the LIN pin and HIN pin of the motor driver chip U5 of the third motor driver chip circuit through resistors R8 and R9. The output ends of the first motor driver chip circuit, the second motor driver chip circuit and the third motor driver chip circuit are respectively connected to the U-phase connection line, V-phase connection line and W-phase connection line of the first stator through the interface P2. The 18th pin, 17th pin and 16th pin of the main chip are respectively connected to the main chip programming interface SWD1, which is used to burn an external program into the main chip to control the rotation speed of the stator.

[0051] The second motor control circuit, the third motor control circuit, the fourth motor control circuit and the first motor control circuit have the same structure. The connection relationships and functions of their components are the same as those of the first motor control circuit, only the numbers of the components are different, so they will not be elaborated here.

[0052] In the first motor control circuit, the 24th pin of the main chip U2 is connected to the emitter of the triode Q25. The base of the triode Q25 is connected to the first pin of the yarn breakage alarm interface P3 through the resistor R62. The second pin of the yarn breakage alarm interface P3 and the collector of the triode Q25 are grounded. The base of the triode Q25 is connected to the power supply VCC through the resistor R60, and the emitter of the triode Q25 is connected to the power supply VCC through the resistor R61. Four yarn breakage detectors 8 are connected in parallel to the yarn breakage alarm interface P3. The four yarn breakage detectors 8 respectively transmit the yarn breakage alarm signals corresponding to the spandex yarns they convey to the main chip U2, and the main chip U2 transmits the yarn breakage alarm signals to the knitting equipment through the communication circuit.

[0053] In the technical solution of the present invention, the communication circuit includes a communication chip U6 and its peripheral circuit. The GND pin of the communication chip U6 is grounded; the VCC pin is connected to a 5V power supply; the VIO pin is connected to a 3.3V voltage to provide a suitable operating level for the communication chip. The TXD pin and RXD pin of the communication chip U6 are used for data transmission and reception. The CANH pin is connected to pin 1 of the CAN communication interface P4 through a fuse F2, and the CANL pin is connected to pin 2 of the CAN communication interface P4 through a fuse F3. Pin 3 of the CAN communication interface P3 is connected to EARTH to realize connection with an external CAN network through the CAN communication interface. One end of the diodes DT1 and DT2 is commonly connected to the CANH pin, and the other end of the diode DT1 is grounded; the other end of the diode DT2 is connected to the CANL pin. One end of the diode DT3 is connected to the CANL pin, and the other end is grounded. The diodes DT1, DT2, and DT3 are bidirectional transient voltage suppression diodes, which are used to protect the circuit from transient overvoltage impact. A resistor R13 is connected between the CANH pin and the CANL pin, and the STB pin is grounded through R12. The two windings of the common mode inductor FQ1 are respectively connected between pin 2 of the fuse F2 and pin 2 of the fuse F3 to suppress common mode interference, and its grounding end is connected to EARTH.

[0054] Each motor composed of a pair of stator and rotor can be independently controlled. The knitting device is connected to the communication circuit through the CAN bus. The TXD pin and RXD pin of the communication circuit are simultaneously connected to 4 main chips, namely chips U2, U7, U12, and U17, and commands including start / stop signals and speed signals are sent to the first motor control circuit, the second motor control circuit, the third motor control circuit, and the fourth motor control circuit in a time-sharing control manner by using the address method to control the four motors respectively.

[0055] In this embodiment, there are 2 yarn feeding rollers on the hollow mandrel. However, in other embodiments, the number of yarn feeding rollers can be adjusted according to specific application requirements and designs. For example, the number of yarn feeding rollers on the hollow mandrel can be set to 1, 3, or other numbers. The number of swing rods 9 and drums corresponds to the number of driving yarn feeding rollers. The retaining ring 90 is set as a retaining ring 90 integrated with the swing rod shaft 9 or a retaining ring 90 detachable from the swing rod shaft 9 according to actual needs, and the detachable retaining ring 90 is locked on the swing rod shaft 9 by screws.

[0056] In the implementation process of the present invention, each pair of motors composed of stators and rotors can be independently controlled. The knitting machine is connected to the communication circuit through the CAN bus. The communication circuit transmits the control signals of the knitting machine, such as start-stop signals and speed signals, to the main chips of each motor control circuit through the communication circuit. Each main chip controls the corresponding motor to perform relevant actions, enabling them to work synchronously or individually. When one or more yarns are suspended from use, the knitting equipment sends a stop signal to stop the corresponding motor from working and the spandex yarn bobbin from feeding yarn, preventing false alarms of the edge frame or yarn entanglement caused by excessive yarn feeding. When the yarn needs to be used, the knitting equipment can send a start signal in advance to start the corresponding motor in advance to avoid the yarn from being tightened. Additionally, in the present invention, the feeding speed of the spandex yarn bobbin can be adjusted according to the current speed of the knitting equipment to ensure timely or excessive yarn feeding.

[0057] In the present invention, multiple spandex yarn bobbins on the spandex frame are independently controlled for feeding by the corresponding motors, and the speed or tension of the yarn bobbins can be flexibly adjusted according to production requirements. The spandex frame of the present invention has a compact structure and occupies less space. Compared with the synchronous belt transmission system in the prior art, the present invention does not require regular maintenance of the synchronous belt and synchronous pulley, reducing the equipment usage cost and downtime.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A passive segmented yarn feeding spandex conveyor rack, characterized in that: It includes a body. A circuit board is arranged inside the body. Driving shafts are respectively arranged on both sides of the body. The driving shaft includes a hollow core shaft installed on the body. One or more stators are fixed on the hollow core shaft. A rotor is sleeved outside the stator. A yarn feeding roller is fixed outside the rotor. Both ends of the yarn feeding roller are rotationally connected to the hollow core shaft through yarn feeding roller bearings. A swing rod frame is fixed at the bottom of the body. Swing rod shafts are respectively arranged on both sides of the end of the swing rod frame. Swing rods corresponding to the number of the yarn feeding rollers are rotationally arranged on the swing rod shafts. A roller shaft is arranged at the end of the swing rod. A roller is rotationally connected to the roller shaft through a roller bearing. During yarn feeding, a spandex yarn bobbin is sleeved on the roller. The swing rod swings towards the side of the yarn feeding roller. The spandex yarn bobbin contacts the yarn feeding roller, and the spandex yarn is conveyed under the drive of the rolling yarn feeding roller.

2. The passive segmented yarn feeding spandex conveyor rack according to claim 1, characterized in that: The roller includes a cylinder body. A fixing plate is arranged on one side of the cylinder body. A plurality of hollow parts are arranged at intervals on the cylinder body. A limiting elastic sheet is arranged at one end of the hollow part away from the fixing plate. The cylinder body is also provided with a plurality of convex ribs.

3. A passive segmented yarn feeding spandex conveyor rack according to claim 2, characterized in that: A bearing installation groove is arranged inside the fixing plate. A roller bearing is installed in the bearing installation groove. The roller bearing is sleeved outside the roller shaft. The inside of the roller shaft is a hollow structure. Fastening bolts are threadedly connected to both ends of it. Its outer end is locked on the end of the swing rod through a fastening screw.

4. A passive segmented yarn feeding spandex conveyor rack according to claim 1, characterized in that: The swing rod includes a sleeve sleeved on the swing rod shaft. A swing arm is connected to the outer side wall of the sleeve. An installation plate is arranged at the end of the swing arm. A reinforcing piece is arranged on the outer side surface of the swing arm. Both ends of the reinforcing piece are respectively connected to the sleeve and the installation plate.

5. A passive segmented yarn feeding spandex conveyor rack according to claim 1, characterized in that: The hollow core shaft is provided with threading holes having the same number as the stators installed on it. A positioning groove is arranged at the inner end of the hollow core shaft. The body is provided with a shaft hole adapted to the shape of the inner end of the hollow core shaft. The hollow core shaft is locked on the body through an inner hollow stepped screw. The electrical connection wires of the stator pass through the threading holes, the hollow core shaft and the inner hollow stepped screw and are electrically connected to the circuit board.

6. The passive segmented yarn feeding spandex conveyor rack according to claim 1, wherein: The circuit board includes a power supply circuit, a plurality of motor control circuits and a communication circuit. The power supply circuit supplies power to the motor control circuit and the communication circuit. The communication circuit is connected to the motor control circuit. Each motor control circuit is electrically connected to a stator. The knitting machine is connected to the communication circuit through a CAN bus.

7. A passive segmented yarn feeding spandex conveyor rack according to claim 6, characterized in that: The motor control circuit includes a main chip and three motor drive chip circuits. The main chip is respectively connected to the signal input ends of the three motor drive chip circuits. The signal outputs of the three motor drive chip circuits are respectively connected to the three-phase wires of the stator.

8. A passive segmented yarn feeding spandex conveyor rack according to claim 7, characterized in that: The motor drive chip circuit includes a motor drive chip and its peripheral circuit. The HIN pin and LIN pin of the motor drive chip are respectively used to access the logic input signals input by the main chip. Its VCC pin is connected to a 15V power supply, and its GND pin is grounded. The HO pin and LO pin of the motor drive chip are respectively connected to a high-side MOS transistor and a low-side MOS transistor through a first resistor and a second resistor. A first diode is also reversely connected between the HO pin of the motor drive chip U3 and the gate of the high-side MOS transistor. A second diode is also reversely connected between the LO pin of the motor drive chip and the gate of the low-side MOS transistor. Among them, the drain of the high-side MOS transistor is connected to a 155V power supply, the source of the high-side MOS transistor is connected to the output terminal, the drain of the low-side MOS transistor is connected to the output terminal, and the source of the low-side MOS transistor is grounded.

9. A passive segmented yarn feeding spandex conveyor according to claim 6, characterized in that: The power supply circuit includes a power supply protection circuit, a rectification circuit, a filtering circuit, a first step-down circuit, a second step-down circuit, and a third step-down circuit connected in sequence.

10. A passive segmented yarn feeding spandex conveyor rack according to claim 6, characterized in that, The communication circuit includes a CAN communication chip and its peripheral circuit.

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