Tension controller and knitting machine

Abstract

The utility model discloses a tension controller and a braiding machine, the tension controller is applied to the braiding machine, the braiding machine comprises a motor, the motor is electrically connected with a three-phase power supply, the tension controller comprises a power supply input end, a main control circuit, a voltage conversion circuit and a sampling circuit, and the power supply input end is used for accessing AC voltage of the three-phase power supply; the voltage conversion circuit is connected in series with a phase line between the motor and the three-phase power supply, and is used for converting the AC voltage and then outputting a first electric signal; the input end of the sampling circuit is electrically connected with the voltage conversion circuit, the output end of the sampling circuit is electrically connected with the main control circuit, and the sampling circuit is used for collecting the first electric signal and outputting a corresponding sampling signal to the main control circuit, so that the main control circuit controls the voltage conversion circuit to work. The utility model aims to improve the tension stability of the knitting machine and further improve the working reliability of the knitting machine.

Description

Technical Field

[0001] The present application relates to the technical field of tension control, and in particular to a tension controller and a knitting machine. Background Art

[0002] In the process of rewinding materials in production lines such as textile, printing and dyeing, and papermaking, the coil diameter of the coil will change continuously when the material is unwinding and rewinding, and the coil tension will change continuously with the change of the coil diameter. In this case, if the coil tension is not controlled, the coil will appear wrinkled, loose, and the thickness will change. In severe cases, the coil may break. In addition, in the printing process, the change of tension can cause the paper to stretch or shrink, and registration errors will occur immediately. Therefore, the coil tension must be controlled. The change of tension is directly related to the quality of the product. Good tension control can improve processing accuracy, work efficiency and material utilization. Utility Model Content

[0003] The main purpose of the utility model is to provide a tension controller and a braiding machine, aiming to improve the tension stability of the braiding machine, thereby improving the reliability of the braiding machine.

[0004] To achieve the above object, the utility model proposes a tension controller, which is applied to a knitting machine. The knitting machine includes a motor, which is electrically connected to a three-phase power supply. The tension controller includes:

[0005] Power input terminal, used to access the AC voltage of the three-phase power supply;

[0006] Main control circuit;

[0007] A voltage conversion circuit, which is connected in series to a phase line between the motor and the three-phase power supply and is used to convert the AC voltage into a first electrical signal;

[0008] A sampling circuit, wherein the input end of the sampling circuit is electrically connected to the voltage conversion circuit, the output end of the sampling circuit is electrically connected to the main control circuit, and is used to collect the first electrical signal and output a corresponding sampling signal to the main control circuit, so that the main control circuit controls the operation of the voltage conversion circuit.

[0009] Optionally, the voltage conversion circuit includes.

[0010] a rectifier circuit, wherein an input end of the rectifier circuit is electrically connected to the power input end and is used to rectify the AC voltage and output a first DC signal;

[0011] An inverter circuit, wherein an input end of the inverter circuit is electrically connected to an output end of the rectifier circuit and is used to invert the first DC signal and output a corresponding first AC signal.

[0012] Optionally, the sampling circuit includes:

[0013] A voltage sampling circuit, wherein the input end of the voltage sampling circuit is electrically connected to the output end of the rectifier circuit, the output end of the voltage sampling circuit is electrically connected to the main control circuit, and is used to collect the voltage value corresponding to the first DC signal and output a corresponding voltage sampling signal to the main control circuit.

[0014] Optionally, the voltage sampling circuit includes:

[0015] A plurality of first resistors connected in series and a plurality of second resistors connected in series, wherein the number of the first resistors and the second resistors are equal, and the resistance values ​​of the first resistors and the second resistors are equal;

[0016] a first differential amplifier, wherein a negative input terminal of the first differential amplifier is electrically connected to a second end of a plurality of first resistors connected in series, and a positive input terminal of the first differential amplifier is electrically connected to a second end of a plurality of second resistors connected in series;

[0017] A second differential amplifier, wherein a positive input terminal of the second differential amplifier is electrically connected to an output terminal of the first differential amplifier, and a negative input terminal of the second differential amplifier is electrically connected to an output terminal of the second differential amplifier.

[0018] Optionally, the sampling circuit further includes:

[0019] A current sampling circuit, wherein the input end of the current sampling circuit is electrically connected to the output end of the inverter circuit, the output end of the current sampling circuit is electrically connected to the main control circuit, and is used to collect the current value corresponding to the first AC signal and output a corresponding current sampling signal to the main control circuit.

[0020] Optionally, the current sampling circuit includes:

[0021] a first sampling resistor and a second sampling resistor, wherein a first end of the first sampling resistor is electrically connected to a first output end of the inverter circuit, and a first end of the second sampling resistor is electrically connected to a second output end of the inverter circuit;

[0022] a filter circuit, the filter circuit being electrically connected to the second end of the first sampling resistor and the second end of the second sampling resistor respectively, and being used to filter the voltage across the first sampling resistor and the voltage across the second sampling resistor respectively and then output the corresponding first signal and second signal;

[0023] an analog isolation circuit, wherein a first input end of the analog isolation circuit is electrically connected to a first output end of the filter circuit, a second input end of the analog isolation circuit is electrically connected to a second output end of the filter circuit, and is used to process a first signal connected to the first input end and a second signal connected to the second input end, respectively, and then output corresponding first and second signals;

[0024] The second differential amplifier circuit includes a second positive input terminal and a second negative input terminal, the second positive input terminal and the second negative input terminal are electrically connected to the output terminal of the analog isolation circuit respectively, the output terminal of the second differential amplifier circuit is electrically connected to the main control circuit, and is used to perform differential amplification processing on the signals of the second negative input terminal and the second positive input terminal and then output them to the main control circuit.

[0025] Optionally, the tension controller includes:

[0026] The communication circuit has a communication terminal connected to an external terminal for communication, the communication circuit is electrically connected to the main control circuit, and is used to receive a control signal from the external terminal via the communication terminal and output the control signal to the main control circuit.

[0027] Optionally, the tension controller includes:

[0028] A material break detection circuit, wherein the input end of the material break detection circuit is used to receive an external signal, and the output end of the material break detection circuit is electrically connected to the main control circuit; and is used to output a corresponding material break detection signal to the main control circuit when the input end of the material break detection circuit receives the external signal.

[0029] Optionally, the material-break detection circuit includes a first detection input terminal, a second detection input terminal, a third resistor, a first filter resistor, a first filter capacitor, an optocoupler device, and a second filter resistor and a second filter capacitor;

[0030] Among them, the first filter resistor is connected in parallel with the first filter capacitor, the first end of the third resistor is electrically connected to the second detection input end, the second end of the third resistor, the first filter resistor and the first common connection end of the first filter capacitor are interconnected, the first filter resistor and the second common connection end of the first filter capacitor, the first detection input end, and the input end of the optocoupler are interconnected, the output end of the optocoupler is electrically connected to the first end of the second filter resistor, the second end of the second filter resistor is electrically connected to the first end of the second filter capacitor, and the second end of the second filter capacitor is grounded.

[0031] The utility model also provides a braiding machine, which comprises any one of the tension controllers described above.

[0032] The utility model proposes a tension controller, which is applied to a braiding machine. The braiding machine includes a motor, which is electrically connected to a three-phase power supply. The tension controller includes a power input end, a main control circuit, a voltage conversion circuit and a sampling circuit. The power input end is used to access the AC voltage of the three-phase power supply; the voltage conversion circuit is connected in series to the phase line between the motor and the three-phase power supply, and is used to output a first electrical signal after performing voltage conversion on the AC voltage; the input end of the sampling circuit is electrically connected to the voltage conversion circuit, and the output end of the sampling circuit is electrically connected to the main control circuit, and is used to collect the first electrical signal and output a corresponding sampling signal to the main control circuit, so that the main control circuit controls the voltage conversion circuit to work.

[0033] In practical applications, the sampling circuit can sample the first electrical signal output by the voltage conversion circuit and output the corresponding sampling signal to the main control circuit, so that the main control circuit controls the voltage conversion circuit to work according to the received sampling signal. For example, the first electrical signal output by the voltage conversion circuit is controlled according to the sampling signal, thereby achieving real-time adjustment of the first electrical signal. In this way, the output torque of the motor is indirectly controlled by changing the size of the first electrical signal, thereby achieving the purpose of constant tension control, improving the reliability of the tension controller, and thereby improving the reliability and stability of the knitting machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0035] Figure 1 This is a schematic diagram of a circuit module of an embodiment of a tension controller of the utility model;

[0036] Figure 2 This is a schematic diagram of a circuit module of another embodiment of the tension controller of the utility model;

[0037] Figure 3 This is a schematic diagram of a circuit module of another embodiment of the tension controller of the utility model;

[0038] Figure 4 This is a schematic diagram of a circuit module of another embodiment of the tension controller of the utility model;

[0039] Figure 5This is a schematic diagram of a circuit module of another embodiment of the tension controller of the utility model;

[0040] Figure 6 A specific circuit diagram of an embodiment of a voltage sampling circuit of the utility model;

[0041] Figure 7 A specific circuit diagram of an embodiment of a current sampling circuit of the utility model;

[0042] Figure 8 The figure is a specific circuit diagram of an embodiment of a material breaking detection circuit of the present utility model.

[0043] Description of Figure Numbers:

[0044] Label name Label name 10 Power input terminal 20 Voltage conversion circuit 30 Main control circuit 40 Sampling circuit 41 Voltage sampling circuit 42 Current sampling circuit 50 Communication circuit 60 Material break detection circuit

[0045] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0048] In the process of rewinding materials in production lines such as textile, printing and dyeing, and papermaking, the coil diameter of the coil will change continuously when the material is unwinding and rewinding, and the coil tension will change continuously with the change of the coil diameter. In this case, if the coil tension is not controlled, the coil will appear wrinkled, loose, and the thickness will change. In severe cases, the coil may break. In addition, in the printing process, the change of tension can cause the paper to stretch or shrink, and registration errors will occur immediately. Therefore, the coil tension must be controlled. The change of tension is directly related to the quality of the product. Good tension control can improve processing accuracy, work efficiency and material utilization.

[0049] To this end, the utility model proposes a tension controller, which is applied to a knitting machine, wherein the knitting machine includes a motor, and the motor is electrically connected to a three-phase power supply. Figure 1 , the tension controller comprises:

[0050] A power input terminal 10 is used to access the AC voltage of a three-phase power supply;

[0051] Main control circuit 30;

[0052] A voltage conversion circuit 20, which is connected in series to a phase line between the motor and the three-phase power supply and is used to convert the AC voltage into a first electrical signal;

[0053] A sampling circuit 40, wherein the input end of the sampling circuit 40 is electrically connected to the voltage conversion circuit 20, and the output end of the sampling circuit 40 is electrically connected to the main control circuit 30, and is used to collect the first electrical signal and output a corresponding sampling signal to the main control circuit 30, so that the main control circuit 30 controls the voltage conversion circuit 20 to work.

[0054] In this embodiment, the main control circuit 30 can be implemented by a main controller, such as MCU, DSP (Digital Signal Process), FPGA (Field Programmable Gate Array), PLC, SOC (System On Chip), etc. The voltage conversion circuit 20 can be implemented by at least one of a switch tube, an inverter, a rectifier, a filter circuit, a buck-boost circuit, or a voltage conversion chip. The sampling circuit 40 can be implemented by a voltage detection circuit, such as a voltage divider circuit, or a voltage detection chip, etc.; or by a current detection circuit, such as a current detection circuit composed of a transistor and a resistor, etc.

[0055] Specifically, when the power input terminal 10 is connected to the AC voltage of the three-phase power supply, the voltage conversion circuit 20 will convert the AC voltage into a voltage, such as after being processed by the filter circuit, the rectifier circuit, and the inverter circuit in sequence, and then output it to the motor to control the rotation of the motor, so that the motor generates torque to control the knitting machine to perform winding work, etc. At the same time, the main control circuit 30 controls the sampling circuit 40 to sample the first electrical signal output by the voltage conversion circuit 20 and output the sampling signal to the main control circuit 30. For example, the sampling circuit 40 is a voltage conversion circuit 20, which is used to sample the bus voltage after the three-phase power supply is rectified and output a voltage sampling signal, so that the main control circuit 30 controls the voltage conversion circuit 20 to work according to the voltage sampling signal. If the voltage value corresponding to the voltage sampling signal is lower than the preset voltage threshold, the PWM duty cycle output by the inverter circuit in the voltage conversion circuit 20 is controlled, so that the motor torque is increased to offset the effect of the motor torque reduction caused by the low bus voltage. Similarly, if the sampling circuit 40 may include a current sampling circuit 42, which is used to sample the output current of the inverter circuit in the voltage conversion circuit 20 and output a current sampling signal to the main control circuit 30, if the current value corresponding to the current sampling signal is lower than the preset current threshold, the main control circuit 30 controls the duty cycle of the PWM signal output by the inverter circuit in the voltage conversion circuit 20, thereby reducing the motor torque to offset the effect of the increase in motor torque caused by the lower output current. Among them, the first electrical signal includes a voltage signal and a current signal. The preset voltage threshold and the preset current threshold are set in advance by the R&D personnel.

[0056] In practical applications, the sampling circuit 40 can sample the first electrical signal output by the voltage conversion circuit 20 and output the corresponding sampling signal to the main control circuit 30, so that the main control circuit 30 controls the voltage conversion circuit 20 to work according to the received sampling signal. For example, the first electrical signal output by the voltage conversion circuit 20 is controlled according to the sampling signal, thereby achieving real-time adjustment of the first electrical signal. In this way, the output torque of the motor is indirectly controlled by changing the size of the first electrical signal, thereby achieving the purpose of constant tension control, improving the reliability of the tension controller, and thereby improving the reliability and stability of the knitting machine.

[0057] In one embodiment of the present utility model, reference Figure 2 , the voltage conversion circuit 20 includes.

[0058] A rectifier circuit, the input end of which is electrically connected to the power input end 10 and is used to rectify the AC voltage and output a first DC signal;

[0059] An inverter circuit, wherein an input end of the inverter circuit is electrically connected to an output end of the rectifier circuit and is used to invert the first DC signal and output a corresponding first AC signal.

[0060] The sampling circuit 40 comprises:

[0061] A voltage sampling circuit 41, wherein the input end of the voltage sampling circuit 41 is electrically connected to the output end of the rectifier circuit, and the output end of the voltage sampling circuit 41 is electrically connected to the main control circuit 30, and is used to collect the voltage value corresponding to the first DC signal and output the corresponding voltage sampling signal to the main control circuit 30.

[0062] Wherein, the voltage sampling circuit 41 comprises:

[0063] A plurality of first resistors connected in series and a plurality of second resistors connected in series, wherein the number of the first resistors and the second resistors are equal, and the resistance values ​​of the first resistors and the second resistors are equal;

[0064] a first differential amplifier, wherein a negative input terminal of the first differential amplifier is electrically connected to a second end of a plurality of first resistors connected in series, and a positive input terminal of the first differential amplifier is electrically connected to a second end of a plurality of second resistors connected in series;

[0065] A second differential amplifier, wherein a positive input terminal of the second differential amplifier is electrically connected to an output terminal of the first differential amplifier, and a negative input terminal of the second differential amplifier is electrically connected to an output terminal of the second differential amplifier.

[0066] In this embodiment, the rectifier circuit can be implemented by a rectifier bridge circuit composed of a triode, a MOS tube or multiple diodes, and the inverter circuit can be composed of at least one switch tube, an inductor, a capacitor and other devices, such as a three-phase bridge inverter circuit.

[0067] Specifically, refer to Figure 6, P+ and P- are respectively the first input terminal and the second input terminal of the voltage conversion circuit 20, OP1 is the first differential amplifier, and OP2 is the second differential amplifier. It can be understood that the first input terminal of the voltage conversion circuit 20 is electrically connected to the output terminal of the rectifier circuit, and the second input terminal of the voltage conversion circuit 20 is connected to the low-level signal. A plurality of first resistors R1 are connected in series between the first input terminal P- and the negative input terminal of the first differential amplifier, and a plurality of second resistors R2 are connected in series between the second input terminal P+ and the positive input terminal of the first differential amplifier. The filter circuit composed of the filter capacitor Cop1, the resistor Rop1, and the resistor Rop2 is used to filter the voltage at the negative input terminal of the first differential amplifier, and the filter capacitor Cop2, the resistor Rop3, and the resistor Rop4 are used to filter the voltage at the positive input terminal of the first differential amplifier, so as to improve the anti-interference ability of the first differential amplifier circuit composed of the first differential amplifier and the second differential amplifier. The filter capacitors Cop3, Cop4, Cop5 and Cop6 are used to filter the power supply of the first differential amplifier and remove the clutter signal in the power supply to make the power supply network more stable. In addition, the first differential amplifier circuit composed of the first differential amplifier OP1 and the second differential amplifier OP2 is used to amplify the sampling signal, thereby improving the accuracy and stability of the voltage sampling signal.

[0068] It should be noted that the four clamping diodes D1, D2, D3 and D4 are respectively used to limit the voltage of the positive input terminal and the negative input terminal of the first differential amplifier within a preset voltage range. The preset voltage range is set in advance by the R&D personnel. For example, the preset voltage range is (-15V, +15V). In this way, the input voltage can be prevented from causing loss to the first differential amplifier.

[0069] Through the above settings, the voltage conversion circuit 20 samples the first DC signal output by the rectifier circuit, that is, the bus voltage is sampled, so that the main control circuit 30 controls the change of the first electrical signal output by the voltage conversion circuit 20 according to the voltage value of the bus voltage, thereby realizing the adjustment of the motor torque and achieving the purpose of constant tension control. It can be understood that the setting of the voltage sampling circuit 41 can collect the bus voltage in real time, that is, sample the state of the customer's power grid in real time, and use the voltage feedback loop to adjust the constant tension, thereby improving the problem of unstable output tension caused by grid fluctuations. In addition, the sampling circuit 40 composed of multiple first resistors connected in series and multiple second resistors connected in series adopts a symmetrical structure, which can better filter out the influence of common mode interference and improve the common mode rejection ratio and sampling accuracy of the circuit. At the same time, the first differential amplifier circuit composed of the first differential amplifier and the second differential amplifier is used to amplify the signal and then output the corresponding voltage sampling signal to the main control circuit 30. In this way, the accuracy of the voltage sampling signal is improved, thereby improving the reliability of the tension controller.

[0070] In another embodiment of the present invention, reference Figure 3 , the sampling circuit 40 further includes:

[0071] A current sampling circuit 42, wherein the input end of the current sampling circuit 42 is electrically connected to the output end of the inverter circuit, and the output end of the current sampling circuit 42 is electrically connected to the main control circuit 30, and is used to collect the current value corresponding to the first AC signal and output a corresponding current sampling signal to the main control circuit 30.

[0072] The current sampling circuit 42 includes:

[0073] a first sampling resistor and a second sampling resistor, wherein a first end of the first sampling resistor is electrically connected to a first output end of the inverter circuit, and a first end of the second sampling resistor is electrically connected to a second output end of the inverter circuit;

[0074] a filter circuit, the filter circuit being electrically connected to the second end of the first sampling resistor and the second end of the second sampling resistor respectively, and being used to filter the voltage across the first sampling resistor and the voltage across the second sampling resistor respectively and then output the corresponding first signal and second signal;

[0075] an analog isolation circuit, wherein a first input end of the analog isolation circuit is electrically connected to a first output end of the filter circuit, a second input end of the analog isolation circuit is electrically connected to a second output end of the filter circuit, and is used to process a first signal connected to the first input end and a second signal connected to the second input end, respectively, and then output corresponding first and second signals;

[0076] The second differential amplifier circuit includes a second positive input terminal and a second negative input terminal, the second positive input terminal and the second negative input terminal are electrically connected to the output terminal of the analog isolation circuit respectively, the output terminal of the second differential amplifier circuit is electrically connected to the main control circuit 30, and is used for differentially amplifying the signals of the second negative input terminal and the second positive input terminal and outputting them to the main control circuit 30.

[0077] In this embodiment, the current sampling circuit 42 can be implemented by the current sampling circuit 42 described in the above embodiment. The filter circuit can be implemented by a capacitor filter circuit, an inductor filter circuit, an L-type LC filter circuit, a π-type LC filter circuit, an RC filter circuit, etc. The analog isolation circuit can be implemented by an analog isolation chip, such as the isolation amplifier AMC1200SDUBR. The second differential amplifier circuit can be implemented by a differential amplifier and peripheral circuits, etc.

[0078] Specifically, refer to Figure 7The first sampling resistor Rcs1 and the second sampling resistor Rcs2 are respectively used to sample the output current of the inverter circuit in the voltage conversion circuit 20. The filtering circuit composed of the first resistor C1, the second resistor C2, the third resistor C3 and the fourth resistor C4 is used to filter the voltage across the first sampling resistor Rcs1 and the voltage across the second sampling resistor Rcs2 and then output them to the analog isolation circuit. In this embodiment, an isolation amplifier is selected to perform isolation and amplification processing on them and then output the corresponding first signal and second signal. Then, the second differential amplifier circuit performs differential amplification processing and then outputs the current sampling signal to the main control circuit 30, so that the main control controls the voltage conversion circuit 20 to work according to the current sampling signal.

[0079] It can be understood that the second differential amplifier circuit includes a third differential amplifier OP3, and capacitors C5, C6, and C7 are used to filter the power supply of the third differential amplifier and filter out the clutter signal in the power supply to make the power supply network more stable. The filter circuit composed of resistor R5 and capacitor C8 is used to filter the signal at the positive input end of the third differential amplifier to make the signal output through the first sampling resistor more stable, and capacitor C9 is used to filter the signal at the negative input end of the third amplifier to make the signal output through the second sampling resistor more stable. Capacitor C10 is used as a frequency compensation capacitor, and the filter capacitor composed of C10 and resistor R4 can filter out high-frequency interference signals to prevent interference to the subsequent circuit.

[0080] Through the above-mentioned setting, the first electrical signal output by the voltage conversion circuit 20 is current sampled through the sampling resistor. The circuit is simple. At the same time, the sampled signal is isolated by the analog isolation chip, and the isolated signal is amplified by the second differential amplifier circuit. In this way, the accuracy of the current sampling signal is improved, and the reliability of the tension controller is further improved.

[0081] In one embodiment of the present utility model, reference Figure 4 , the tension controller comprises:

[0082] The communication circuit 50 has a communication terminal connected to an external terminal for communication. The communication circuit 50 is electrically connected to the main control circuit 30 and is used to receive a control signal from the external terminal via the communication terminal and output the control signal to the main control circuit 30.

[0083] In this embodiment, the communication circuit 50 is implemented by a wired communication module, such as a LIN communication module, a CAN communication module, an RS485 transceiver chip, etc., and the corresponding bus type is selected according to the communication module. The communication module can also be implemented by a wireless communication module, such as a WiFi module, a Bluetooth communication module, a 4G / 5G module, etc.

[0084] Specifically, the communication circuit 50 of this embodiment is implemented by a wireless communication module, and is used to communicate with an external terminal through the communication end of the communication circuit 50, wherein the external terminal includes electronic devices such as mobile phones, tablets, and computers. It should be noted that the terminal device may include multiple trigger components. This embodiment includes at least four trigger components, namely a forward trigger component, a reverse trigger component, a forward jog trigger component, a reverse jog trigger component, and a stop trigger component. When the trigger component is triggered by the user, it outputs a corresponding trigger signal to the main control circuit 30 so that the main control circuit 30 controls the motor to work. In order to improve the service life of the trigger component and the user experience, this embodiment implements multiple trigger components in the form of virtual buttons and integrates them into the touch screen. In this way, the tension controller of the utility model can be connected to the terminal device or the knitting machine with a touch screen through the communication circuit 50, and the user triggers the corresponding trigger component according to the actual production needs, thereby realizing different functions. In practical applications, it can be realized that the touch screen of a terminal device is electrically connected to the communication circuit 50 of multiple tension controllers at the same time to control multiple tension controllers to improve work efficiency. Moreover, the R&D personnel can set the special parameters of the tension controller in advance according to the needs of the customers, that is, the parameters are fixed at the factory, and the users do not need to adjust the parameters repeatedly, and the production operation control can be realized through only a few trigger components, which improves the convenience and user experience of the users. In addition, the tension controller also includes a potentiometer electrically connected to the main control circuit 30, which is used for the users to adjust the tension in real time.

[0085] Through the above settings, the parameters of the tension controller are solidified at the factory according to customer needs, and only the trigger components of common functions such as forward, reverse, forward jog, reverse electric, and stop are retained, which improves user convenience. In addition, the tension controller can also be set as a drawer structure in terms of structure, which is convenient for users to install and further improve user experience.

[0086] In one embodiment of the present utility model, reference Figure 5 , the tension controller comprises:

[0087] A material break detection circuit 60, wherein the input end of the material break detection circuit 60 is used to receive an external signal, and the output end of the material break detection circuit 60 is electrically connected to the main control circuit 30; and is used to output a corresponding material break detection signal to the main control circuit 30 when the input end of the material break detection circuit 60 receives the external signal.

[0088] It is understandable that in the prior art, capacitive material break sensors, acoustic material break sensors, vibrating string material break sensors, photoelectric ranging material break sensors, etc. are generally used to determine whether there is a material break situation. Among them, the capacitive material break sensor uses the capacitance change between the material and the sensor to detect the presence of the material. When the material approaches the electrode, the capacitance value will change, thereby triggering the sensor to output a signal. The acoustic material break sensor determines the presence of the material by detecting the sound generated when the material flows. When the material flows in the pipeline, a sound signal is generated, and the acoustic sensor can receive these signals and output a corresponding signal. The vibrating string material break sensor detects the presence of the material through the joint action of the magnetic field induction principle and the vibrating string sensor. The vibrating string sensor generates vibration by inducing magnetic field oscillations, and generates a damping effect when the material approaches. The vibrating string sensor senses this change and outputs a corresponding signal. The photoelectric ranging material break sensor detects the presence of the material by controlling the transmitting light source and the receiving light source. When the material appears between the transmitting light source and the receiving light source, the light is blocked by the material, and the receiving light source outputs a signal, thereby triggering the sensor to output a signal.

[0089] In this embodiment, the external signal includes a signal output by a material break sensor. A material break sensor may be integrated in the tension controller. Specifically, the material break detection circuit 60 includes a first detection input terminal OP, a second detection input terminal D11, a third resistor R3, a first filter resistor R7, a first filter capacitor C11, an optical coupler U2, a second filter resistor R8, and a second filter capacitor C12;

[0090] Among them, the first filter resistor R7 is connected in parallel with the first filter capacitor C11, the first end of the third resistor R3 is electrically connected to the second detection input terminal D11, the second end of the third resistor R3, the first filter resistor R7 and the first common connection terminal of the first filter capacitor C11 are interconnected, the first filter resistor R7 and the second common connection terminal of the first filter capacitor C11, the first detection input terminal OP, and the input end of the optocoupler device U2 are interconnected, the output end of the optocoupler device U2 is electrically connected to the first end of the second filter resistor R8, the second end of the second filter resistor R8 is electrically connected to the first end of the second filter capacitor C12, and the second end of the second filter capacitor C12 is grounded.

[0091] Specifically, the first detection input terminal OP can be connected to a +24V voltage, and the second detection input terminal D11 is used to be electrically connected to the output terminal of the material-breaking sensor, and is used to connect to an external signal. When a material-breaking fault occurs, the material-breaking sensor will output a corresponding external signal to the second detection input terminal D11. At this time, D111 is connected to a low-level signal, and the optocoupler device U2 is in a conducting state, and outputs a low-level signal to the main control circuit 30, so that the main control circuit 30 performs corresponding control work according to the material-breaking detection signal output by the material-breaking detection circuit 60. For example, the tension controller also includes a sound prompt component or a light prompt component, and when the main control circuit 30 receives the material-breaking detection signal, the control prompt component works. Among them, the sound prompt component can be implemented by a buzzer, and the light prompt component can be implemented by an indicator light. That is, the main control circuit 30 controls the buzzer to give a sound alarm prompt, and can also control the indicator light to give a light prompt, so that the user can find the material-breaking fault and deal with it in time.

[0092] The setting of the material breakage detection circuit 60 enables the user to promptly detect and handle material breakage failures in the knitting machine, thereby improving the functional diversity of the tension controller and further improving the reliability of the knitting machine.

[0093] The utility model also provides a braiding machine, which comprises any one of the tension controllers described above.

[0094] It is worth noting that, since the knitting machine of the present invention is based on the above-mentioned tension controller, the embodiments of the knitting machine of the present invention include all technical solutions of all embodiments of the above-mentioned tension controller, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0095] The above description is only an optional embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the inventive concept of the utility model, or directly / indirectly used in other related technical fields are included in the scope of the utility model.

Claims

1. A tension controller, applied to a knitting machine, wherein the knitting machine comprises a motor, the motor being electrically connected to a three-phase power supply, characterized in that: The tension controller comprises: Power input terminal, used to access the AC voltage of the three-phase power supply; Main control circuit; a voltage conversion circuit, the voltage conversion circuit being connected in series to a phase line between the motor and the three-phase power supply and configured to convert the AC voltage into a first electrical signal; A sampling circuit, wherein the input end of the sampling circuit is electrically connected to the voltage conversion circuit, the output end of the sampling circuit is electrically connected to the main control circuit, and is used to collect the first electrical signal and output a corresponding sampling signal to the main control circuit, so that the main control circuit controls the operation of the voltage conversion circuit.

2. The tension controller according to claim 1, wherein: The voltage conversion circuit includes: a rectifier circuit, wherein an input terminal of the rectifier circuit is electrically connected to the power input terminal and is configured to rectify the AC voltage and output a first DC signal; An inverter circuit, wherein an input end of the inverter circuit is electrically connected to an output end of the rectifier circuit, and is used to invert the first DC signal and output a corresponding first AC signal.

3. The tension controller according to claim 2, characterized in that: The sampling circuit comprises: A voltage sampling circuit, wherein the input end of the voltage sampling circuit is electrically connected to the output end of the rectifier circuit, the output end of the voltage sampling circuit is electrically connected to the main control circuit, and is used to collect the voltage value corresponding to the first DC signal and output a corresponding voltage sampling signal to the main control circuit.

4. The tension controller according to claim 3, characterized in that: The voltage sampling circuit includes: a plurality of first resistors connected in series and a plurality of second resistors connected in series, wherein the number of the first resistors and the second resistors are equal, and the resistance values ​​of the first resistors and the second resistors are equal; a first differential amplifier, wherein a negative input terminal of the first differential amplifier is electrically connected to the second ends of the plurality of first resistors connected in series, and a positive input terminal of the first differential amplifier is electrically connected to the second ends of the plurality of second resistors connected in series; A second differential amplifier, wherein a positive input terminal of the second differential amplifier is electrically connected to the output terminal of the first differential amplifier, and a negative input terminal of the second differential amplifier is electrically connected to the output terminal of the second differential amplifier.

5. The tension controller according to claim 2, wherein: The sampling circuit further includes: A current sampling circuit, wherein the input end of the current sampling circuit is electrically connected to the output end of the inverter circuit, the output end of the current sampling circuit is electrically connected to the main control circuit, and is used to collect the current value corresponding to the first AC signal and output a corresponding current sampling signal to the main control circuit.

6. The tension controller according to claim 5, characterized in that: The current sampling circuit includes: a first sampling resistor and a second sampling resistor, wherein a first end of the first sampling resistor is electrically connected to the first output end of the inverter circuit, and a first end of the second sampling resistor is electrically connected to the second output end of the inverter circuit; a filter circuit, the filter circuit being electrically connected to the second end of the first sampling resistor and the second end of the second sampling resistor, respectively, and configured to filter the voltage across the first sampling resistor and the voltage across the second sampling resistor, respectively, and then output corresponding first and second signals; an analog isolation circuit, wherein a first input terminal of the analog isolation circuit is electrically connected to the first output terminal of the filter circuit, a second input terminal of the analog isolation circuit is electrically connected to the second output terminal of the filter circuit, and is configured to process a first signal connected to the first input terminal and a second signal connected to the second input terminal, respectively, and then output corresponding first and second signals; A second differential amplifier circuit includes a second positive input terminal and a second negative input terminal, the second positive input terminal and the second negative input terminal are electrically connected to the output terminal of the analog isolation circuit respectively, the output terminal of the second differential amplifier circuit is electrically connected to the main control circuit, and is used to differentially amplify the signals of the second negative input terminal and the second positive input terminal and output them to the main control circuit.

7. The tension controller according to claim 1, wherein: The tension controller comprises: The communication circuit has a communication terminal connected to an external terminal for communication, the communication circuit is electrically connected to the main control circuit, and is used to receive a control signal from the external terminal via the communication terminal and output the control signal to the main control circuit.

8. The tension controller according to claim 1, wherein: The tension controller comprises: A material break detection circuit, wherein the input end of the material break detection circuit is used to receive an external signal, and the output end of the material break detection circuit is electrically connected to the main control circuit; and is used to output a corresponding material break detection signal to the main control circuit when the input end of the material break detection circuit receives the external signal.

9. The tension controller according to claim 8, wherein: The material-break detection circuit includes a first detection input terminal, a second detection input terminal, a third resistor, a first filter resistor, a first filter capacitor, an optocoupler device, a second filter resistor, and a second filter capacitor; Particularly, the first filter resistor is connected in parallel with the first filter capacitor, the first end of the third resistor is electrically connected to the second detection input end, the second end of the third resistor, the first filter resistor, and the first common connection end of the first filter capacitor are interconnected, the first filter resistor and the second common connection end of the first filter capacitor, the first detection input end, and the input end of the optocoupler are interconnected, the output end of the optocoupler is electrically connected to the first end of the second filter resistor, the second end of the second filter resistor is electrically connected to the first end of the second filter capacitor, and the second end of the second filter capacitor is grounded.

10. A braiding machine, characterized in that: The braiding machine comprises the tension controller according to any one of claims 1-9.

Images