Passive sectional yarn feeding spandex frame

Abstract

The invention relates to the technical field of weaving machine accessories, and discloses a passive segmented yarn feeding spandex frame which comprises a machine body, driving shafts are arranged on the two sides of the rear face of the machine body respectively, driven shafts are arranged on the two sides of the front face of the machine body respectively, each driving shaft comprises a driving core shaft, one or more stators are fixed to each driving core shaft, and rotors are arranged on the outer sides of the stators in a sleeving mode. A driving yarn feeding roller is fixed to the outer side of the rotor and rotationally connected with the driving mandrel through a first bearing. The driven shaft comprises a driven core shaft installed on the machine body, and one or more driven yarn feeding rollers are rotationally connected to the driven core shaft through a second bearing. The driving yarn feeding rollers and the driven yarn feeding rollers are in one-to-one correspondence. According to the passive segmented yarn feeding spandex frame, 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, the space is saved, and the maintenance cost is reduced.

Description

Technical Field

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

[0002] The spandex frame is an important part of 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 frames 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 frames 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 frames are driven by the same synchronous belt, wear, looseness or installation errors of the synchronous belt will cause the spandex frames to run out of sync, affecting the fabric quality. 2. It is difficult to independently control a single spandex yarn bobbin with the synchronous belt drive method, and it is difficult to flexibly adjust the speed or tension of the yarn 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 pulley need to be maintained and replaced regularly, increasing the use 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 frame, which is equipped with an independent motor drive system for each spandex yarn bobbin. Each spandex yarn bobbin can independently adjust the speed and tension, abandoning the traditional synchronous belt drive method, saving space and reducing maintenance costs.

[0004] To achieve the above purpose, the present invention adopts the following technical solution: A passive segmented yarn feeding spandex frame, including a body. Driving shafts are respectively arranged on both sides at the back of the body, and driven shafts are respectively arranged on both sides at the front of the body. The driving shaft includes a driving core shaft installed on the body. One or more stators are fixed to the driving core shaft. A rotor is sleeved outside the stator. A driving yarn feeding roller is fixed outside the rotor. The driving yarn feeding roller is rotationally connected to the driving core shaft through a bearing I; the driven shaft includes a driven core shaft installed on the body. One or more driven yarn feeding rollers are rotationally connected to the driven core shaft through a bearing II; the driving yarn feeding rollers and the driven yarn feeding rollers correspond one by one, and the spandex yarn bobbins are placed on the driving yarn feeding rollers and the corresponding driven yarn feeding rollers.

[0005] Further, a support frame is installed on the top of the body. The end of the support frame is installed with a U-shaped driven wheel bracket. A rotating shaft is fixed to the driven wheel bracket. A plurality of movable rods corresponding in number and position to the driving yarn feeding rollers are rotatably arranged on the rotating shaft. The end of the movable rod is fixed with a driven wheel shaft. The end of the driven wheel shaft is rotationally connected with a driven wheel through a bearing.

[0006] Further, a hanging plate is provided below the machine body, and a yarn break detector corresponding to the driving yarn feeding roller in terms of quantity and position is hung on the hanging plate.

[0007] Further, a side bar is provided between two adjacent spandex yarn bobbins. A side bar seat is provided at the bottom of the side bar, and the side bar seat is installed on the hanging plate.

[0008] Further, intermediate bar seats are installed on both sides of the machine body, and an intermediate bar with a U-shaped structure is provided on the two intermediate bar seats.

[0009] Further, a circuit board is provided inside the machine body. 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, and the motor control circuit is electrically connected to the stator.

[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, and the signal output ends 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 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 driver chip are respectively connected to a high-end MOS transistor and a low-end 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-end MOS transistor, and a second diode is also reversely connected between the LO pin of the motor driver chip U3 and the gate of the low-end MOS transistor. Among them, the drain of the high-end MOS transistor is connected to a 155V power supply, the source of the high-end MOS transistor is connected to the output end, the drain of the low-end MOS transistor is connected to the output end, and the source of the low-end MOS transistor is grounded.

[0012] Further, 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.

[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: 1. Two pairs of stators and rotors of the present invention share a hollow drive core shaft, with a more compact overall structure, less occupied space, effectively saving space and being light in weight. 2. Under the self-weight of the driven wheel, the movable rod and the bearing, the driven wheel presses on the top of the spandex yarn bobbin, keeping the spandex yarn bobbin in a stable position during the wire feeding process, reducing the shaking or deviation of the spandex yarn bobbin. During wire feeding, the rolling friction between the driven wheel and the spandex yarn bobbin reduces the resistance when the spandex yarn bobbin rotates, making the wire feeding process smoother and reducing the fluctuation of the yarn tension. The driven wheel can prevent the spandex yarn bobbin from jumping up due to a significant increase in the rotation speed of the driving yarn feeding roller. 3. Multiple spandex yarn bobbins on the spandex rack of 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 stators and rotors of the present invention can be independently controlled. The knitting machine is connected through a CAN bus to implement the communication circuit. The communication circuit transmits 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, and each main chip controls the corresponding motor to execute relevant actions, enabling them to work synchronously or separately. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present invention.

[0017] Figure 2 is an internal structural schematic diagram of the left side view of the present invention.

[0018] Figure 3 For the present invention Figure 2 is a schematic structural diagram of the A-A cross-section.

[0019] Figure 4 For the present invention Figure 2 is a schematic structural diagram of the B-B cross-section.

[0020] Figure 5 is a schematic structural diagram of the present invention without placing the spandex yarn bobbin.

[0021] Figure 6 is a schematic structural diagram of the drive core shaft of the present invention.

[0022] Figure 7 is a schematic structural diagram of the driven core shaft of the present invention.

[0023] Figure 8 is a schematic structural diagram of the connection structure between the drive core shaft and the driven core shaft of the present invention and the first shaft seat and the second shaft seat.

[0024] Figure 9 is a circuit principle block diagram of the present invention.

[0025] Figure 10 This is the circuit schematic diagram of the power supply circuit of the present invention.

[0026] Figure 11 This is the circuit schematic diagram of the control circuit of the first motor in the embodiment of the present invention.

[0027] Figure 12 This is the circuit schematic diagram of the control circuit of the second motor in the embodiment of the present invention.

[0028] Figure 13 This is the circuit schematic diagram of the control circuit of the third motor in the embodiment of the present invention.

[0029] Figure 14 This is the circuit schematic diagram of the control circuit of the fourth motor in the embodiment of the present invention.

[0030] Figure 15 This is the circuit schematic diagram of the communication circuit of the present invention.

[0031] Reference numerals: 1 - body; 2 - spandex yarn bobbin; 3 - drive shaft; 30 - drive core shaft; 300 - threading hole; 301 - positioning groove; 31 - bearing spacer one; 32 - bearing one; 33 - rotor; 34 - yarn feeding roller; 35 - bearing spacer two; 36 - stator; 4 - driven shaft; 40 - driven hollow core shaft; 41 - bearing spacer three; 43 - bearing spacer four; 42 - bearing two; 5 - mounting support frame; 6 - driven wheel bracket; 7 - rotating shaft; 8 - movable rod; 9 - driven wheel shaft; 10 - driven wheel; 11 - reinforcing piece; 12 - hanging plate; 13 - yarn break detector; 14 - edge stop rod seat; 15 - edge stop rod; 16 - intermediate stop rod seat; 17 - intermediate stop rod; 18 - shaft seat one; 19 - inner stepped screw one; 20 - outer stepped screw one; 21 - shaft seat two; 22 - inner stepped screw two; 23 - outer stepped screw two. Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the present invention clearer, the following detailed description is made in conjunction with the accompanying drawings and specific implementation manners. 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, and 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 implementations disclosed below.

[0033] It should be noted that when an element is referred to as being "fixedly provided on" 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 manners.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only 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.

[0035] See Figures 1-15 , this embodiment provides a passive segmented yarn feeding spandex frame, including a machine body 1, and a circuit board is arranged inside the machine body 1. Driving shafts 3 are respectively arranged on both sides of the rear of the machine body 1, and driven shafts 4 are respectively arranged on both sides of the front of the machine body 1. The driving shaft 3 includes a driving core shaft 30 with a hollow structure, and threads are respectively arranged on the inner walls of both ends thereof. Two shaft seats one 18 are arranged on both sides of the rear of the machine body 1, and a shaft hole one is provided on the shaft seat one 18. A positioning groove one 301 is arranged at the inner end of the driving core shaft 30. The shape of the shaft hole one is adapted to the shape of the inner end of the driving core shaft 30. The inner end of the driving core shaft 30 is inserted into the shaft seat one 18 and is locked and installed on the machine body 1 through an inner hollow step screw one 19. Through the arrangement of the positioning groove one 301, the driving core shaft 30 is prevented from rotating. Two stators 36 are fixed on the driving core shaft 30, a rotor 33 is sleeved outside the stator 36, and a driving yarn feeding roller 34 is fixed outside the rotor 33; both ends of the driving yarn feeding roller 34 are rotatably connected with the driving core shaft 30 through a bearing one 32, and a bearing spacer one 31 sleeved on the driving core shaft 30 is arranged between the bearing one 32 and the stator 36. A bearing spacer two 35 sleeved on the driving core shaft 30 is arranged between adjacent bearings one 32. The outer end of the driving core shaft is threadedly connected with an outer hollow step screw one 20. Two wire passing holes 300 are arranged on the driving core shaft 30, and the two wire passing holes 300 are respectively arranged on one side of the two stators 36. The electrical connection wires of the two stators 36, that is, three-phase wires, respectively pass through the corresponding wire passing holes 300, the hollow space of the driving core shaft 30 and the inner hollow step screw 19 and are electrically connected with the circuit board. Each pair of stator and rotor forms a motor. There are four motors in this embodiment, namely the first motor, the second motor, the third motor and the fourth motor. In implementation, the stator 36 is connected to three-phase electricity, the stator 36 generates a rotating magnetic field, an induced current will be generated in the rotor 33 under the action of this rotating magnetic field, and then the rotor 33 starts to rotate under the action of the electromagnetic force, and the rotation of the rotor 33 causes the driving yarn feeding roller 34 to rotate. In the technical solution of the present invention, two pairs of stators 36 and rotors 33 share a hollow driving core shaft, 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, and it is flexibly applicable to different production processes.

[0036] The driven shaft 40 includes a driven core shaft 40 parallel to the driving core shaft 30. The inside of the driven core shaft 40 is a hollow structure, and threads are respectively provided on the inner walls at both ends thereof. Two shaft seats two 21 are provided on both sides of the front surface of the machine body 1. An axial hole two is provided on the shaft seat two 21. A positioning groove two 400 is provided at the inner end of the driven core shaft 40. The shape of the axial hole two is adapted to the shape of the inner end of the driven core shaft 40. The inner end of the driven core shaft 30 is inserted into the shaft seat two 21 and is locked and installed on the machine body 1 through an inner hollow step screw two 22. Through the setting of the positioning groove two 400, the rotation of the driven core shaft 40 is prevented. Two driven yarn feeding rollers 44 are sleeved outside the driven core shaft 40. Both ends of the driven yarn feeding roller 44 are respectively rotationally connected to the driven core shaft 40 through bearings two 42. A bearing spacer three 41 sleeved on the driven core shaft 40 is provided between two bearings two of the same driven yarn feeding roller 44. A bearing spacer four 43 sleeved on the driven core shaft 40 is provided between two bearings two 42 between adjacent driven yarn feeding rollers 44. The driving yarn feeding rollers 34 and the driven yarn feeding rollers 44 are in one-to-one correspondence. Each pair of the driving yarn feeding rollers 34 and the driven yarn feeding rollers 44 can be used to place the spandex yarn bobbin 2. When the driving yarn feeding roller 34 rotates and contacts the surface of the spandex yarn bobbin 2, due to the frictional force between the two, the rotation of the driving yarn feeding roller 34 drives the spandex yarn bobbin 2 to rotate accordingly. During the rotation of the spandex yarn bobbin 2, the yarn is fed. The driven yarn feeding roller 44 parallel to the driving yarn feeding roller 34 plays a supporting role for the spandex yarn bobbin 2 to keep the spandex yarn bobbin 2 in a stable position. When the driving yarn feeding roller 34 drives the spandex yarn bobbin 2 to rotate, the driven yarn feeding roller 44 will also rotate with the spandex yarn bobbin 2, reducing the frictional resistance between the spandex yarn bobbin 2 and the supporting surface of the driven yarn feeding roller 44, making the rotation of the spandex yarn bobbin 2 smoother, and thus feeding the yarn more efficiently.

[0037] The outer end of the driven core shaft 40 is threadedly connected with an outer hollow step screw two 23. A reinforcing piece 11 is provided on the outer side surfaces of the outer hollow step screw one 20 and the outer hollow step screw two 23 on the same side, making the overall structure of the spandex frame more stable.

[0038] A support frame 5 is installed on the top of the machine body 1. A driven wheel bracket 6 with a U-shaped structure is installed at the end of the support frame 5. A rotating shaft 7 is fixed to the driven wheel bracket 6. Four movable rods 8 corresponding to the four driving yarn feeding rollers 34 in terms of quantity and position are rotatably arranged on the rotating shaft 7. A driven wheel shaft 9 is fixed to the end of the movable rod 8. A driven wheel 10 is rotatably connected to the end of the driven wheel shaft 9 through a bearing. When the spandex yarn bobbin 2 is placed on the driving yarn feeding roller 34 and the driven yarn feeding roller 44, and the driven wheel 10 is placed on the top of the spandex yarn bobbin 2, under the action of its own weight, it presses on the top of the spandex yarn bobbin 2, which helps the spandex yarn bobbin 2 maintain a stable position during the wire feeding process, reduce the shaking or deviation of the spandex yarn bobbin. When the spandex yarn bobbin 2 rotates to feed the wire, the driven wheel 10 and the spandex yarn bobbin 2 have rolling friction, reducing the resistance when the spandex yarn bobbin 2 rotates, making the wire feeding process smoother and reducing the fluctuation of the yarn tension. In addition, under the action of the self-weight of the driven wheel 10, the movable rod and the bearing, the driven wheel can prevent the spandex yarn bobbin from jumping up due to a large increase in the rotation speed of the driving yarn feeding roller.

[0039] A hanging plate 12 is arranged below the machine body 1. A plurality of yarn break detectors 13 corresponding to the driving yarn feeding rollers 34 in terms of quantity and position are hung on the hanging plate 12. The conveyed yarn passes through the yarn break detector 13, and the yarn break detector 13 is used to monitor whether the conveyed spandex yarn breaks. When the yarn breaks, the yarn break detector 13 emits a yarn break alarm signal.

[0040] A side baffle rod 15 is arranged between two adjacent spandex yarn bobbins 2. A side baffle rod seat 14 is arranged at the bottom of the side baffle rod 15, and the side baffle rod seat 14 is installed on the hanging plate 12. Intermediate baffle rod seats 16 are installed on both sides of the machine body 1, and a U-shaped intermediate baffle rod 17 is arranged on the two intermediate baffle rod seats 16. The side baffle rod and the intermediate baffle rod 17 play a positioning role for the spandex yarn bobbin 2, restricting the axial movement of the spandex yarn bobbin 2.

[0041] In the technical solution of the present invention, the circuit board includes a power supply circuit, four motor control circuits and a communication circuit. The four motor control circuits are respectively a first motor control circuit, a second motor control circuit, a third motor control circuit and a fourth motor control 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 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.

[0042] 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 connected in sequence. The power protection circuit, the rectification circuit, and the filtering circuit form a filtering circuit that converts the input 110V AC into 155V DC. The 155V DC is converted into 15V DC by the first step-down circuit, and the 15V DC is converted into 5V DC (i.e., the VCC power supply) by the second step-down circuit. The 5V DC is converted into 3.3V DC power supply by the third step-down circuit.

[0043] The motor control circuit includes a main chip and three motor driver chip circuits, namely, the first motor driver chip circuit, the second motor driver chip circuit, and the third motor driver chip circuit. The main chip is respectively connected to the signal input ends of the three motor driver chip circuits, and the signal outputs of the three motor driver chip circuits are respectively connected to the three-phase lines of the stator. Among them, the signal output end of the first motor driver 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 driver 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 driver chip circuit is connected to the W-phase connection line among the three-phase lines of the stator.

[0044] It should be noted that, as Figure 11 shown, in the first motor control circuit, the first motor driver chip circuit, the second motor driver chip circuit, and the third motor driver chip circuit are respectively the first first-motor driver chip circuit, the first second-motor driver chip circuit, and the first third-motor driver chip circuit. By analogy, as Figures 12-14 shown, in the second motor control circuit, the corresponding three motor driver chip circuits are respectively the second first-motor driver chip circuit, the second second-motor driver chip circuit, and the second third-motor driver chip circuit; in the third motor control circuit, the corresponding ones are the third first-motor driver chip circuit, the third second-motor driver chip circuit, and the third third-motor driver chip circuit. In the fourth motor control circuit, the corresponding ones are the fourth first-motor driver chip circuit, the fourth second-motor driver chip circuit, and the fourth third-motor driver chip circuit.

[0045] In the first motor control circuit, the motor first 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. 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. 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. 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 OV.

[0046] In the first motor control circuit, the motor second drive chip circuit and the motor third drive chip circuit have the same structure as the motor first drive chip circuit. The connection relationships and functions of all components are the same as those of the motor first drive chip circuit, only the numbers of all components are different, so they will not be elaborated here.

[0047] 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 drive chip U3 of the first motor drive 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 drive chip U4 of the second motor drive 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 drive chip U5 of the third motor drive chip circuit through resistors R8 and R9. The output ends of the first motor drive chip circuit, the second motor drive chip circuit and the third motor drive chip circuit are respectively connected to the U-phase connection line, V-phase connection line and W-phase connection line of the first motor 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.

[0048] 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, and the connection relationship and functions of their components are the same as those of the first motor control circuit, only the component numbers are different, so they will not be elaborated here.

[0049] 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 1st pin of the yarn breakage alarm interface P3 through the resistor R62. The 2nd 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.

[0050] 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 the 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, and connection to an external CAN network is achieved through the CAN communication interface. One end of diodes DT1 and DT2 is commonly connected to the CANH pin. The other end of diode DT1 is grounded; the other end of diode DT2 is connected to the CANL pin. One end of diode DT3 is connected to the CANL pin, and the other end is grounded. Diodes DT1, DT2, and DT3 are bidirectional transient voltage suppression diodes, which are used to protect the circuit from transient overvoltage impacts. 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 fuse F2 and pin 2 of fuse F3 to suppress common mode interference, and its grounded end is connected to the earth EARTH.

[0051] 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 the RXD pin of the communication circuit are simultaneously connected to pins 14 and 15 of 4 main chips, namely chips U2, U7, U12, and U17. Time-division control (including speed, start / stop, alarm) is performed in an addressing manner to send commands (including start / stop signals and speed signals) to the first motor control circuit, the second motor control circuit, the third motor control circuit, and the fourth motor control circuit to control the four motors respectively.

[0052] In this embodiment, 2 driving yarn feed rollers are provided on the driving mandrel. However, in other embodiments, the number of driving yarn feed rollers can be adjusted according to specific application requirements and designs. For example, the number of driving yarn feed rollers can be set to 1, 3, or other numbers. The number of driven yarn feed rollers corresponds to the number of driving yarn feed rollers.

[0053] During the implementation of the present invention, the knitting machine is connected through the CAN bus to realize the communication circuit. 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, avoiding yarn tension. 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.

[0054] Multiple spandex yarn bobbins on the spandex frame of the present invention 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 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.

[0055] 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 make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A passive segmented yarn feeding spandex frame, characterized in that: It includes a body. Driving shafts are respectively arranged on both sides at the rear of the body, and driven shafts are respectively arranged on both sides at the front of the body. The driving shaft includes a driving core shaft installed on the body. One or more stators are fixed on the driving core shaft. A rotor is sleeved outside the stator. A driving yarn feeding roller is fixed outside the rotor. The driving yarn feeding roller is rotationally connected to the driving core shaft through a first bearing. The driven shaft includes a driven core shaft installed on the body. One or more driven yarn feeding rollers are rotationally connected to the driven core shaft through a second bearing. The driving yarn feeding rollers and the driven yarn feeding rollers are in one-to-one correspondence, and the spandex yarn bobbins are placed on the driving yarn feeding rollers and the corresponding driven yarn feeding rollers.

2. The passive segmented yarn feeding spandex frame according to claim 1, characterized in that: A support frame is installed on the top of the body. A driven wheel support with a U-shaped structure is installed at the end of the support frame. A rotating shaft is fixed on the driven wheel support. A plurality of movable rods corresponding to the driving yarn feeding rollers in number and position are rotationally arranged on the rotating shaft. A driven wheel shaft is fixed at the end of the movable rod. A driven wheel is rotationally connected to the end of the driven wheel shaft through a bearing.

3. A passive segmented yarn feeding spandex frame according to claim 1 or 2, characterized in that: A hanging plate is arranged below the body. Yarn break detectors corresponding to the driving yarn feeding rollers in number and position are hung on the hanging plate.

4. A passive segmented yarn feeding spandex frame according to claim 3, characterized in that: A baffle rod is arranged between two adjacent spandex yarn bobbins. A baffle rod seat is arranged at the bottom of the baffle rod. The baffle rod seat is installed on the hanging plate.

5. A passive segmented yarn feeding spandex frame according to claim 1, characterized in that: Intermediate baffle rod seats are installed on both sides of the body. A U-shaped intermediate baffle rod is arranged on the two intermediate baffle rod seats.

6. The passive segmented yarn feeding spandex frame according to claim 1, wherein: A circuit board is arranged inside the body. 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. The motor control circuit is electrically connected to the stator.

7. A passive segmented yarn feeding spandex conveying 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 output ends of the three motor drive chip circuits are respectively connected to the three-phase lines 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 tube and a low-side MOS tube 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 tube. A second diode is also reversely connected between the LO pin of the motor drive chip U3 and the gate of the low-side MOS tube. Among them, the drain of the high-side MOS tube is connected to a 155V power supply, the source of the high-side MOS tube is connected to the output end, the drain of the low-side MOS tube is connected to the output end, and the source of the low-side MOS tube is grounded.

9. A passive segmented yarn feeding spandex conveyor rack 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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