Yarn storage device

Abstract

The utility model relates to the technical field of yarn storage devices, and discloses a yarn storage device which comprises a microswitch, a power switch, a motor, a temperature control switch, a broken yarn feeler lever, an aviation plug, an aviation plug interface circuit, a step-down circuit, a main chip control circuit, an isolation power circuit and a motor driving circuit. The temperature control switch is arranged in a motor shaft of the motor; the aviation plug is connected with the flat knitting machine through a cable, the motor drive circuit is connected with the main chip control circuit, the main chip control circuit is connected with a control interface, and the control interface is connected with the microswitch, the temperature control switch, the broken yarn probe rod and the power switch. The aviation plug interface circuit is connected with the step-down circuit, the step-down circuit is connected with the isolation power supply circuit, and the isolation power supply circuit outputs power and provides working voltage for the main chip control circuit. Yarn breakage false alarm is reduced, yarn breakage alarm is closed while the yarn storage device is closed, and the motor can be closed when the motor is locked.

Description

Technical Field

[0001] This utility model relates to the field of yarn feeding technology for flat knitting machines, and in particular to a yarn storage device. Background Technology

[0002] The yarn accumulator mainly consists of a housing, a main shaft mounted on it, and a yarn accumulator cylinder. A pressure ring and a tension ring are fitted onto the yarn accumulator cylinder. The main shaft is located at the center of the yarn accumulator cylinder and drives the cylinder to rotate for yarn storage. The stored yarn is placed on a feed roller, and the yarn is fed out after passing through the tension ring. The yarn storage process is as follows: The motor rotates, driving the yarn accumulator cylinder to rotate. During the storage process, the yarn continuously accumulates on the cylinder. As the yarn accumulates, the pressure ring moves upward. When the pressure ring moves to a certain position, it disconnects from the switch, at which point the motor stops rotating, and yarn storage stops. As the feeding process continues, the yarn on the cylinder continuously decreases, and the pressure ring moves downward. When it moves to a certain position, it triggers the switch to open, and the motor continues to work, driving yarn storage, thus completing the cycle.

[0003] The existing yarn storage devices for flat knitting machines have the following problems:

[0004] 1. Existing flat knitting machine yarn storage devices use torsion switches or push-button switches to turn off the power to the yarn storage devices, but fail to turn off the yarn breakage alarm. When several yarn storage devices on the flat knitting machine are not in use during the current process, it is necessary to remove the yarn storage devices or their power supply or fix the yarn breakage probe rod. This method is inconvenient to operate and reduces the efficiency of machine adjustment.

[0005] 2. When existing flat knitting machines experience yarn entanglement and jamming of the yarn storage drum, it causes the yarn storage device to stall. If the yarn storage device stalls for an extended period, and the motor also stalls, its temperature rises rapidly, eventually burning out the motor. Currently, yarn storage devices on the market frequently experience motor burnout due to yarn entanglement and stalling.

[0006] 3. The existing yarn breakage detector of the flat knitting machine is prone to false alarms due to low front clamping tension and machine vibration, which leads to frequent machine shutdowns, increases the workload of operators, and reduces production efficiency. Utility Model Content

[0007] In view of this, the purpose of this utility model is to provide a yarn storage device to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model adopts the following technical solution: a yarn storage device, comprising a yarn storage device body; including a micro switch, a power switch, a motor, a temperature control switch, a yarn breakage probe, an aviation plug, an aviation plug interface circuit, a step-down circuit, a main chip control circuit, an isolated power supply circuit, and a motor drive circuit; the temperature control switch is disposed within the motor shaft; the aviation plug is connected to the flat knitting machine via a cable; the motor drive circuit is connected to the main chip control circuit and the motor; the main chip control circuit is connected to a control interface, which is connected to the micro switch, the temperature control switch, the yarn breakage probe, and the power switch; the aviation plug interface circuit is connected to the step-down circuit, the step-down circuit is connected to the isolated power supply circuit, and the isolated power supply circuit outputs power to provide operating voltage for the main chip control circuit.

[0009] Furthermore, the main chip control circuit includes a main chip U5. Pin 1 of the main chip U5 is connected to the alarm output circuit, and pins 19 and 20 of the main chip U5 are connected to the motor drive circuit. Pins 15, 16, 17, and 18 of the main chip U5 are connected to the power supply VCC through resistors R19, R17, R16, and R14, respectively. Pins 15, 16, and 18 of the main chip U5 are connected to pins 4, 3, and 1 of the control interface P5, respectively. Pin 17 of the main chip U5 is connected to pin 2 of the control interface P5 through diode D7. Pin 5 of the control interface P5 is grounded. Pins 1, 2, 3, and 4 of the control interface are connected to the power switch, the yarn breakage detector, the micro switch, and the temperature control switch, respectively.

[0010] Further, the motor drive circuit includes a bidirectional optocoupler U3, a bidirectional silicon controlled rectifier (SCR) SCR1, a thermistor RT1, an input current-limiting resistor R10 for the optocoupler, a control current-limiting resistor R8 for the SCR, a motor interface P2, and a capacitor interface P3. Pin 6 of the bidirectional optocoupler U3 is connected to the second anode of the bidirectional SCR1. The first and second anodes of the bidirectional SCR1 are respectively connected to pins 1 and 2 of the thermistor RT1. The first anode of the bidirectional SCR1 is connected to pin 2 of the motor interface P2. Pin 4 of the bidirectional optocoupler U3 is connected to... The current-limiting resistor R8 is connected to the control electrode of the bidirectional thyristor SCR1. Pin 1 of the bidirectional optocoupler U3 is connected to pin 20 of the main chip U5 through the optocoupler input current-limiting resistor R10. Pin 2 of the bidirectional optocoupler U3 is connected to pin 19 of the main chip U5. Pin 2 of the motor interface P2 is connected to pin 2 of the capacitor interface P3. Pin 3 of the motor interface P2 is connected to pin 1 of the capacitor interface P3. Pin 1 of the motor interface P2 is connected to the common ground SGND. The motor interface P2 is connected to the motor, and the capacitor interface P3 is connected to the capacitor.

[0011] Furthermore, the aviation plug interface circuit includes an aviation plug interface P1. Pins 1, 2, 3, and 4 of the aviation plug interface P1 are connected to pins 1, 2, 3, and 4 of the aviation plug, respectively. Pin 4 of the aviation plug interface P1 is connected to one pole of the AC power supply provided by the internal power supply circuit of the flat knitting machine, serving as the common ground SGND. Pin 3 of the aviation plug interface P1 is connected to the other pole of the AC power supply, and through fuse F1, is connected to pin 6 of the bidirectional optocoupler U3 of the motor drive circuit and varistor RV1. Varistor RV1 is connected to fast recovery diode D2, which performs half-wave rectification to power the step-down circuit. Pin 2 of the aviation plug interface P1 is connected to the alarm output circuit, transmitting the alarm signal BJSC output by the alarm output circuit to the flat knitting machine.

[0012] Furthermore, the alarm output circuit includes a transistor Q3, a resistor R12, a relay K1, and a diode D6. The base of the transistor Q3 is connected to pin 1 of the main chip U5 through the resistor R12. The collector of the transistor Q3 is grounded, and the emitter of the transistor Q3 is connected to one end of the coil of the relay K1. The other end of the coil of the relay K1 is connected to the power supply VCC. The cathode of the diode D6 is connected to one end of the normally open contact of the relay K1, and the other end of the normally open contact of the relay K1 is grounded.

[0013] Furthermore, when the yarn breakage probe closes, it outputs a yarn breakage alarm signal to the main chip U5. The main chip U5 judges the duration of the yarn breakage alarm signal. If the duration of the yarn breakage alarm signal reaches the preset alarm duration of the main chip U5, the main chip triggers an alarm output. If the duration of the yarn breakage alarm signal does not reach the preset alarm duration of the main chip U5, the main chip does not trigger an alarm output.

[0014] Furthermore, when the power switch is closed, the main chip U5 receives a power-off signal and controls the alarm output to be turned off.

[0015] Furthermore, the temperature control switch is used to monitor the temperature of the motor and output a temperature control signal when the temperature is too high. The main chip U5 receives the temperature control signal and controls the motor to stop working.

[0016] Beneficial effects

[0017] Compared with the prior art, the present invention has at least the following advantages:

[0018] 1. This utility model's yarn storage device sends the yarn breakage alarm signal input by the yarn breakage probe to the main chip. The main chip judges the duration of the yarn breakage alarm signal, filters false alarms, reduces operator workload, and improves production efficiency. When the duration of the yarn breakage alarm signal is less than the preset alarm duration, it is determined to be a false alarm and no alarm output is triggered; conversely, when the duration of the yarn breakage alarm signal reaches the preset alarm duration, it is determined to be a yarn breakage, the main chip controls the motor to stop, and triggers the alarm output, which includes an LED indicator and an alarm signal sent to the flat knitting machine via an alarm output circuit.

[0019] 2. When the main chip of this utility model receives the signal from the push-button switch to close the yarn storage device, it outputs a signal to shut down the alarm output, so that when the yarn storage device is closed, the yarn breakage alarm output is also turned off.

[0020] 3. The motor shaft of the yarn storage device of this utility model has a built-in temperature control switch. When the yarn storage device stalls or other abnormalities cause the temperature to rise too high, the temperature control switch sends a signal to the main chip, and the main chip outputs a signal to control the motor to stop working, thereby protecting the motor from burning out due to overheating. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the yarn storage device structure of this utility model.

[0022] Figure 2 This is the wiring diagram inside the yarn storage device of this utility model.

[0023] Figure 3 This is the circuit schematic diagram of this utility model.

[0024] The diagram is labeled as follows: 1-Frame; 2-Circuit board; 3-Aviation plug; 4-Yarn storage cylinder; 5-Yarn pressing ring; 6-Motor; 60-Motor shaft; 7-Aviation plug interface circuit; 8-Step-down circuit; 9-Main chip control circuit; 10-Isolation power supply circuit; 11-Motor drive circuit; 12-Alarm output circuit; K1-Power switch; K2-Yarn breakage probe; K3-Micro switch; K4-Temperature control switch; P1-Aviation plug interface; P2-Motor interface; P3-Capacitor interface; P4-LED interface; P5-Control interface; P6-Programming interface. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, a detailed description is provided below in conjunction with the accompanying drawings and specific embodiments. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0026] 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 be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] See Figures 1-3 This embodiment provides a yarn storage device, including a yarn storage device body 1. A circuit board 2 is disposed inside the yarn storage device body 1, and an aviation plug 3 is disposed on the top of the yarn storage device body 1. A power switch K1 is disposed on the top of the end of the yarn storage device body 1 furthest from the aviation plug 3, and a swingable yarn breakage probe K2 is disposed at its bottom. The yarn breakage probe K2 has opening and closing contacts; swinging upwards indicates an open state, and swinging downwards indicates a closed state. A motor 6 is fixed to the bottom of the yarn storage device body 1, and a yarn storage cylinder 4 is mounted on the motor 6. A yarn pressing ring 5 is disposed on the yarn storage cylinder 4, and the yarn pressing ring 5 can rotate with the yarn storage cylinder 4. A micro switch is used to detect whether the yarn storage device is full. When the yarn storage device is working, as the yarn on the yarn storage cylinder 4 continuously winds, the number of yarn layers gradually increases, and the yarn pressing ring 5 gradually moves upwards due to the push of the yarn. When the yarn storage cylinder 4 is full of yarn, the yarn pressing ring 5 will move to the vicinity of the top of the yarn storage cylinder 4. At this time, the yarn pressing ring 5 will touch the micro switch K3 set on the yarn storage body 1.

[0029] A temperature control switch K4 is installed inside the motor shaft 60 of the motor 6 to monitor the temperature of the motor shaft 60 in real time; the temperature control switch K4, micro switch K3, yarn breakage probe K2, power switch K1, aviation plug 3 are electrically connected to the circuit board 2, and the aviation plug 3 is connected to the flat knitting machine through a cable.

[0030] In this utility model technical solution, the circuit board 2 includes an aviation plug interface circuit 7, a step-down circuit 8, a main chip control circuit 9, an isolation power supply circuit 10, and a motor drive circuit 11; the motor drive circuit 11 is connected to the main chip control circuit 9, and the main chip control circuit is connected to the control interface P5, which is connected to the micro switch K3, the temperature control switch K4, the yarn breakage probe K2, and the power switch K1.

[0031] The aviation plug interface circuit 7 is connected to the step-down circuit 8, which is connected to the isolation power supply 10. The isolation power supply 10 outputs power VCC to provide operating voltage for the main chip control circuit 9. The step-down circuit 8 includes a DC-DC power chip U2 and its peripheral circuits; the isolation power supply module 10 includes an isolation power supply module U1 and its peripheral circuits.

[0032] The main chip control circuit 9 includes a main chip U5, which in this embodiment is a microcontroller. Pin 8 of the main chip U5 is connected to pin 10 via capacitor C8. Pin 8 is connected to the power supply VCC, and pin 10 is grounded. Capacitor C8 is a decoupling capacitor. Pins 11 and 12 of the main chip U5 are connected to the programming interface P6 for programming the microcontroller.

[0033] Pin 1 of the main chip U5 is connected to an alarm output circuit, which includes a transistor Q3, a resistor R12, a relay K1, and a diode D6. The base of transistor Q3 is connected to pin 1 of the main chip U5 through resistor R12. The collector of transistor Q3 is grounded, and the emitter of transistor Q3 is connected to one end of the coil of relay K1. The other end of the coil of relay K1 is connected to the power supply VCC. The cathode of diode D6 is connected to one end of the normally open contact of relay K1, and the other end of the normally open contact of relay K1 is grounded. The anode of diode D6 is connected to pin 2 of the aviation connector interface P1, and pin 2 of the aviation connector interface P1 is connected to pin 2 of the aviation connector. When the main control chip U5 outputs an alarm signal, the current is limited by resistor R12, controlling transistor Q3 to conduct, thereby grounding one end of the coil of relay K1. Power supply VCC is connected to the other end of the coil of relay K1, causing relay K1 to operate. The contacts of relay K1 conduct, outputting a low-level alarm signal BJSC to the aviation connector interface circuit, and then transmitting the alarm signal BJSC to the flat knitting machine via aviation connector 3. Pins 19 and 20 of the main chip U5 are connected to the motor drive circuit 11; pin 2 of the main chip U5 is connected to pin 2 of the LED interface P4 through resistor R13. Pin 1 of the LED interface P4 is grounded. The LED interface P4 is used to connect LED indicator 8. When pin 2 of the main chip U5 is high, LED indicator 8 operates; conversely, when pin 2 is low, LED indicator 8 stops operating.

[0034] Pins 15, 16, 17, and 18 of the main chip U5 are connected to the power supply VCC via resistors R19, R17, R16, and R14, respectively. Pins 15, 16, and 18 of the main chip U5 are connected to pins 4, 3, and 1 of the control interface P5, respectively. Pin 17 of the main chip U5 is connected to pin 2 of the control interface P5 via diode D7. Pin 5 of the control interface P5 is grounded. Pins 1, 2, 3, and 4 of the control interface are connected to the power switch K1, the yarn breakage detector K2, the micro switch K3, and the temperature control switch K4, respectively. When no over-temperature alarm is detected, temperature control switch K4 remains normally open, and pin 15 of main chip U5 remains high, allowing the yarn accumulator to operate normally. Conversely, when abnormalities such as yarn accumulator stalling cause excessive temperature rise, temperature control switch K4 closes, sending a low-level temperature control signal to main chip U5. Pin 15 of main chip U5 then goes low, and pins 19 and 20 of main chip U5 output signals to stop the yarn accumulator, thus preventing motor damage due to stalling. When microswitch K3 does not detect a full yarn accumulator signal, microswitch K3 remains normally closed, and pin 16 of main chip U5 goes low, allowing the yarn accumulator to operate. Conversely, when microswitch K3 opens, pin 16 of main chip U5 goes high, indicating the yarn accumulator is full, and pins 19 and 20 of main chip U5 output signals to stop the motor. When the yarn accumulator is not broken, the yarn breakage probe K2 remains normally closed. When the main chip is in the "open" state (upward-facing), pin 17 of the main chip U5 is at a high level, allowing the yarn accumulator to operate. Conversely, when the yarn breakage probe K2 is closed (downward-facing), pin 17 of the main chip U5 is at a low level, and pins 19 and 20 of the main chip U5 output signals to stop the yarn accumulator from operating. Simultaneously, an alarm signal is output, i.e., LED indicator 8 connected to LED interface P4 lights up, and alarm output circuit 12 outputs alarm signal BJSC to the flat knitting machine. When the power switch K1 is normally open, pin 18 of the main chip U5 is at a high level, the yarn accumulator stops operating, motor 7 does not operate, and the main chip U5 disables alarm output, i.e., LED indicator 8 connected to LED interface P4 is off, and alarm output circuit 12 does not output alarm signal BJSC to the flat knitting machine. Conversely, when the power switch K1 is closed, pin 18 of the main chip U5 is at a low level, and the yarn accumulator is in standby mode.

[0035] The motor drive circuit 11 includes a bidirectional optocoupler U3, a bidirectional silicon controlled rectifier (SCR) SCR1, a thermistor RT1, an input current-limiting resistor R10 for the optocoupler, a control current-limiting resistor R8 for the SCR1, a motor interface P2, and a capacitor interface P3. Pin 6 of the bidirectional optocoupler U3 is connected to the second anode of the bidirectional SCR1. The first and second anodes of the bidirectional SCR1 are respectively connected to pins 1 and 2 of the thermistor RT1. The first anode of the bidirectional SCR1 is connected to pin 2 of the motor interface P2. Pin 4 of the bidirectional optocoupler U3... The control current limiting resistor R8 is connected to the control electrode of the bidirectional thyristor SCR1. Pin 1 of the bidirectional optocoupler U3 is connected to pin 20 of the main chip U5 through the optocoupler input current limiting resistor R10. Pin 2 of the bidirectional optocoupler U3 is connected to pin 19 of the main chip U5. Pin 2 of the motor interface P2 is connected to pin 2 of the capacitor interface P3. Pin 3 of the motor interface P2 is connected to pin 1 of the capacitor interface P3. Pin 1 of the motor interface P2 is connected to the common ground SGND. The motor interface P2 is connected to the motor, and the capacitor interface P3 is connected to the capacitor. When the output signal of pin 20 of the main chip U5 is high and the output signal of pin 19 is low, pin 20 is connected to pin 1 of the bidirectional optocoupler U3 via the current limiting resistor R10. Pin 2 of the bidirectional optocoupler U3 returns to pin 19 of the microcontroller (low level), enabling the bidirectional optocoupler U3 to work. Pins 4 and 6 of the bidirectional optocoupler U3 are turned on, supplying AC42 power to the main winding of motor 7 and one pin of the capacitor. The other pin of the capacitor is connected to the auxiliary winding of motor 7, making the motor rotate in the forward direction.

[0036] The aviation plug interface circuit 7 includes an aviation plug interface P1. Pins 1, 2, 3, and 4 of the aviation plug interface P1 are connected to pins 1, 2, 3, and 4 of the aviation plug 3, respectively. The aviation plug 3 is connected to the flat knitting machine via a cable. Pin 4 of the aviation plug interface P1 is connected to one terminal of the AC42V power supply provided by the internal power supply circuit of the flat knitting machine, serving as the common ground SGND, which is the common ground SGND for the input and output of the step-down circuit 8 and the input of the isolation power supply circuit 10. It is also connected to the common terminal of the motor 7 (pin 1 of the motor interface P2). Pin 3 of the aviation plug interface P1 is connected to the other terminal of the AC42V power supply. Through the fuse F1, it is connected to pin 6 of the bidirectional optocoupler U3 of the motor drive circuit 11 and the varistor RV1. The thermistor RV1 is connected to the fast recovery diode D2. The fast recovery diode D2 performs half-wave rectification, and the output power supply VIN supplies power to the step-down circuit 8. Pin 2 of the aviation plug interface P1 is connected to the alarm output circuit, which outputs the alarm signal BJSC to the flat knitting machine.

[0037] In this utility model's technical solution, when the yarn breakage probe K2 of the yarn storage device closes, it outputs a yarn breakage alarm signal to pin 17 of the main chip U5. Upon receiving the yarn breakage alarm signal, the timer inside the main chip U5 starts timing the yarn breakage alarm signal. When the timer's timing value reaches the preset alarm duration of the main chip U5, the device is in a yarn breakage state, and the main chip outputs an alarm signal BJSC to the aviation connector and controls the LED indicator to light up. When the timer's timing value for the yarn breakage alarm signal does not reach the preset alarm duration of the main chip U5, the device is not in a yarn breakage state, the main chip U5 does not output the alarm signal BJSC to the aviation connector, and the LED indicator does not light up.

[0038] Specifically, when the yarn breakage probe K2 is raised, pin 2 of the control interface P5 is at a high level, pin 17 of the main chip U5 is at a high level, and pins 1 and 2 of the main chip U5 are set to a low level. No alarm is output, the LED indicator is off, and the yarn storage device is operational. When the yarn breakage probe K2 is lowered, it is grounded through pin 5 of the control interface P5, resulting in a low level. Pin 17 of the main chip U5 is also at a low level. When the main chip U5 detects this low-level yarn breakage alarm signal, it starts timing the signal. If the duration of the low-level yarn breakage alarm signal input (yarn breakage probe signal) does not reach the preset alarm duration, no alarm signal BJSC is output. If the duration of the yarn breakage alarm signal input reaches the preset alarm duration, a yarn breakage is detected, the alarm signal BJSC is output, and the LED indicator lights up.

[0039] It should be noted that when the main chip is powered on, pins 1 and 2 of the main chip U5 are set to low level, and the alarm is not output (including the LED indicator light not working).

[0040] In actual use, when the yarn tension is low, the yarn at the front end of the yarn breakage probe will cause the probe to fall briefly and trigger an alarm, but the yarn is not actually broken. This usually happens within about 0.3 seconds in actual use. Therefore, in this embodiment, the preset alarm duration is set to 0.3 seconds.

[0041] In this utility model's technical solution, the main chip U5 determines whether the push-button switch is closed. When the push-button switch K1 is closed, pin 18 of the main chip U5 is at a low level, the yarn feeder works, and the alarm output circuit is effective. When there is an alarm output, the alarm output circuit outputs an alarm signal BJSC to the flat knitting machine. When the push-button switch K1 is open, pin 18 of the main chip U5 is at a high level, the yarn feeder does not work, pins 1 and 2 of the main chip U5 output a low level, the alarm output function is disabled, that is, the yarn feeder is turned off, the motor will not work, the alarm output is prohibited, that is, the LED indicator is not lit, and no alarm signal BJSC is output. Regardless of whether an alarm is triggered, no alarm signal BJSC will be output.

[0042] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions 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 this utility model.

Claims

1. A yarn storage device, comprising a yarn storage body; characterized in that, The device includes a micro switch, a power switch, a motor, a temperature control switch, a yarn breakage detector, an aviation connector, an aviation connector interface circuit, a step-down circuit, a main chip control circuit, an isolated power supply circuit, and a motor drive circuit. The temperature control switch is located inside the motor shaft. The aviation connector is connected to the flat knitting machine via a cable. The motor drive circuit is connected to the main chip control circuit and the motor. The main chip control circuit has a control interface, which is connected to the micro switch, the temperature control switch, the yarn breakage detector, and the power switch. The aviation connector interface circuit is connected to the step-down circuit, which is connected to the isolated power supply circuit. The isolated power supply circuit outputs power to provide the operating voltage for the main chip control circuit.

2. A yarn storage device according to claim 1, characterized in that, The main chip control circuit includes a main chip U5. Pin 1 of the main chip U5 is connected to the alarm output circuit, and pins 19 and 20 of the main chip U5 are connected to the motor drive circuit. Pins 15, 16, 17, and 18 of the main chip U5 are connected to the power supply VCC through resistors R19, R17, R16, and R14, respectively. Pins 15, 16, and 18 of the main chip U5 are connected to pins 4, 3, and 1 of the control interface P5, respectively. Pin 17 of the main chip U5 is connected to pin 2 of the control interface P5 through diode D7. Pin 5 of the control interface P5 is grounded. Pins 1, 2, 3, and 4 of the control interface are connected to the power switch, the yarn breakage detector, the micro switch, and the temperature control switch, respectively.

3. A yarn storage device according to claim 2, characterized in that, The motor drive circuit includes a bidirectional optocoupler U3, a bidirectional silicon controlled rectifier (SCR) SCR1, a thermistor RT1, an input current-limiting resistor R10 for the optocoupler, a control current-limiting resistor R8 for the SCR, a motor interface P2, and a capacitor interface P3. Pin 6 of the bidirectional optocoupler U3 is connected to the second anode of the bidirectional SCR1. The first and second anodes of the bidirectional SCR1 are connected to pins 1 and 2 of the thermistor RT1, respectively. The first anode of the bidirectional SCR1 is connected to pin 2 of the motor interface P2. Pin 4 of the bidirectional optocoupler U3 is connected via a capacitor... The SCR control current limiting resistor R8 is connected to the control electrode of the bidirectional SCR1. Pin 1 of the bidirectional optocoupler U3 is connected to pin 20 of the main chip U5 through the optocoupler input current limiting resistor R10. Pin 2 of the bidirectional optocoupler U3 is connected to pin 19 of the main chip U5. Pin 2 of the motor interface P2 is connected to pin 2 of the capacitor interface P3. Pin 3 of the motor interface P2 is connected to pin 1 of the capacitor interface P3. Pin 1 of the motor interface P2 is connected to the common ground SGND. The motor interface P2 is connected to the motor, and the capacitor interface P3 is connected to the capacitor.

4. A yarn storage device according to claim 3, characterized in that, The aviation plug interface circuit includes an aviation plug interface P1. Pins 1, 2, 3, and 4 of the aviation plug interface P1 are connected to pins 1, 2, 3, and 4 of the aviation plug, respectively. Pin 4 of the aviation plug interface P1 is connected to one pole of the AC power supply provided by the internal power supply circuit of the flat knitting machine, serving as the common ground SGND. Pin 3 of the aviation plug interface P1 is connected to the other pole of the AC power supply, and through fuse F1, is connected to pin 6 of the bidirectional optocoupler U3 of the motor drive circuit and varistor RV1. Varistor RV1 is connected to fast recovery diode D2, which performs half-wave rectification to power the step-down circuit. Pin 2 of the aviation plug interface P1 is connected to the alarm output circuit, transmitting the alarm signal BJSC output by the alarm output circuit to the flat knitting machine.

5. A yarn storage device according to claim 4, characterized in that, The alarm output circuit includes a transistor Q3, a resistor R12, a relay K1, and a diode D6. The base of the transistor Q3 is connected to pin 1 of the main chip U5 through the resistor R12. The collector of the transistor Q3 is grounded. The emitter of the transistor Q3 is connected to one end of the coil of the relay K1. The other end of the coil of the relay K1 is connected to the power supply VCC. The cathode of the diode D6 is connected to one end of the normally open contact of the relay K1. The other end of the normally open contact of the relay K1 is grounded.

6. A yarn storage device according to any one of claims 1-5, characterized in that, When the yarn breakage probe closes, it outputs a yarn breakage alarm signal to the main chip U5. The main chip U5 judges the duration of the yarn breakage alarm signal. If the duration of the yarn breakage alarm signal reaches the preset alarm duration of the main chip U5, the main chip triggers the alarm output. If the duration of the yarn breakage alarm signal does not reach the preset alarm duration of the main chip U5, the main chip does not trigger the alarm output.

7. A yarn storage device according to any one of claims 1-5, characterized in that, When the power switch is closed, the main chip U5 receives a power-off signal and controls the alarm output to be turned off.

8. A yarn storage device according to any one of claims 1-5, characterized in that, The temperature control switch is used to monitor the temperature of the motor and outputs a temperature control signal when the temperature is too high. The main chip U5 receives the temperature control signal and controls the motor to stop working.

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