A synchronous wire feeding control device and control method, and welding equipment.

Abstract

This invention discloses a synchronous wire feeding control device and method, and a welding machine, including an input connection module, a motor start / stop status sampling module, a motor direction sampling module, a motor speed sampling module, and a signal processing module. The input connection module is connected to the main wire feeding motor, the motor start / stop status sampling module is connected to the input connection module, the motor direction sampling module is connected to the input connection module, and the motor speed sampling module is connected to the input connection module. The input terminal of the signal processing module is connected to the motor start / stop status sampling module, the motor direction sampling module, and the motor speed sampling module respectively to form a control signal based on the first sampling signal, the second sampling signal, and the third sampling signal. The control terminal of the signal processing module outputs a control signal to control the operation of the drive module of the auxiliary wire feeding motor, synchronizing the start, direction, and speed of the two motors to ensure a stable supply of welding wire and improve welding quality.

Description

Technical Field

[0001] This invention relates to the field of electronic circuit control technology, and in particular to a synchronous wire feeding control device and control method, and welding equipment. Background Technology

[0002] Existing gas shielded welding machines typically require a motor to drive a wire feeder. However, in industries such as tank truck and shipbuilding, where the operating range is large and long-distance wire feeding is necessary, and where the welding wires used are highly ductile (such as carbon steel and stainless steel), the wire feeding resistance is significantly greater than in conventional applications with wire diameters of 1.4mm, 1.6mm, and above. Traditional single-motor wire feeding devices cannot meet the demand for stable wire feeding.

[0003] To address these issues, a solution has been proposed that involves adding an auxiliary wire feeding motor to the main wire feeding motor. The main wire feeding motor drives the main wire feeding wheel, and the auxiliary wire feeding motor drives the auxiliary wire feeding wheel. The main and auxiliary wire feeding wheels are positioned one behind the other in the wire feeding direction, and the main and auxiliary motors operate synchronously, thereby increasing the wire feeding torque and achieving stable wire feeding. However, implementing this solution requires ensuring that the main and auxiliary wire feeding motors start synchronously and operate in the same direction and at the same speed. Previously, parallel connection of the main and auxiliary wire feeding motors achieved synchronous start and same direction of operation, but the loads applied to the main and auxiliary motors differed. If the load on either motor suddenly changes, it becomes difficult to achieve speed synchronization between the two motors. This speed asynchrony leads to unstable wire feeding, affecting the quality of the weld. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a synchronous wire feeding control device and control method, as well as welding equipment, to stably and synchronously start, rotate, and speed up the main wire feeding motor and the auxiliary wire feeding motor, ensuring a stable supply of welding wire and improving welding quality.

[0005] According to a first aspect of the present invention, a synchronous wire feeding control device is applied to a welding machine, the welding machine including a main wire feeding motor and an auxiliary wire feeding motor. The synchronous wire feeding control device includes: an input connection module for connecting to the main wire feeding motor; a motor start / stop state sampling module connected to the input connection module to form a first sampling signal, the first sampling signal being used to characterize the result of sampling the start / stop state of the main wire feeding motor; a motor direction sampling module connected to the input connection module to form a second sampling signal, the second sampling signal being used to characterize the result of sampling the direction of the main wire feeding motor; a motor speed sampling module connected to the input connection module to form a third sampling signal, the third sampling signal being used to characterize the result of sampling the speed of the main wire feeding motor; and a signal processing module, the input terminals of which are respectively connected to the motor start / stop state sampling module, the motor direction sampling module, and the motor speed sampling module to form a control signal based on the first sampling signal, the second sampling signal, and the third sampling signal, and the control terminal of which is connected to the drive module of the auxiliary wire feeding motor to output a control signal to control the operation of the drive module.

[0006] A synchronous wire feeding control device according to an embodiment of the present invention has at least the following beneficial effects:

[0007] This invention relates to a synchronous wire feeding control device. An input connection module connects to the main wire feeding motor to obtain its operating status. Specifically, a motor start / stop status sampling module samples the start / stop status of the main wire feeding motor to form a first sampling signal; a motor direction sampling module samples the direction of the main wire feeding motor to form a second sampling signal; and a motor speed sampling module samples the speed of the main wire feeding motor to form a third sampling signal. A signal processing module generates a control signal based on the first, second, and third sampling signals. This control signal is then used to control the drive module of the auxiliary wire feeding motor, ensuring that the start, direction, and speed of the auxiliary wire feeding motor are synchronized with the main wire feeding motor. Furthermore, this design eliminates the need to modify the original drive structure of the main wire feeding motor, resulting in a simpler structure. This design stably synchronizes the start, direction, and speed of the main and auxiliary wire feeding motors, ensuring a stable supply of welding wire and improving welding quality.

[0008] According to some embodiments of the present invention, the input connection module includes a connection terminal group and a first rectifier unit. The connection terminal group is respectively connected to the two poles of the power supply terminal of the main wire feeding motor to obtain a first drive current. The connection terminal group is respectively connected to the motor direction sampling module and the input terminal of the first rectifier unit. The output terminal of the first rectifier unit is respectively connected to the motor start / stop state sampling module and the motor speed sampling module.

[0009] According to some embodiments of the present invention, the motor start / stop state sampling module includes a semiconductor switch Q9, a semiconductor switch Q10, a capacitor C17, a resistor R47, a resistor R49, and a resistor R51. The controlled terminal of the switch Q9 is connected to the output terminal of the first rectifier unit. The output terminal of the switch Q9 is connected to the first terminal of the capacitor C17, the first terminal of the resistor R51, and the first terminal of the resistor R49. The tail terminal of the resistor R49 is connected to the controlled terminal of the switch Q10. The first terminal of the resistor R47 is connected to the input terminal of the switch Q10 and the signal processing module. The input terminal of the switch Q9 and the tail terminal of the resistor R47 are both connected to the power supply. The tail terminal of the resistor R51, the tail terminal of the capacitor C17, and the output terminal of the switch Q10 are all grounded.

[0010] According to some embodiments of the present invention, the motor speed sampling module includes a comparison unit, a first generation unit, a second generation unit, a second rectification unit, and a speed control unit. The input terminal of the first generation unit is connected to the output terminal of the first rectification unit to generate a first comparison voltage based on the first drive current. The input terminal of the second rectification unit is connected to the two poles of the power supply terminal of the auxiliary wire feeding motor to obtain a second drive current. The input terminal of the second generation unit is connected to the output terminal of the second rectification unit to generate a second comparison voltage based on the second drive current. The first input terminal of the comparison unit is connected to the output terminal of the first generation unit, the second input terminal of the comparison unit is connected to the output terminal of the second generation unit, and the output terminal of the comparison unit is connected to the speed control unit. The speed control unit generates a speed control signal as a third sampling signal based on the comparison result of the comparison unit. The speed control unit is connected to the signal processing module.

[0011] According to some embodiments of the present invention, the first generating unit includes resistors R37 and R39 and capacitor C10; the comparison unit includes comparator U7B, capacitor C12 and resistor R41; the second generating unit includes resistors R42 and R43, an adjustable resistor RW1 and capacitor C14; the first end of resistor R37 is connected to the output terminal of the first rectifier unit; the second end of resistor R37 is connected to the first end of resistor R39, the first end of capacitor C10, and the first input terminal of comparator U7B; and the first end of adjustable resistor RW1 is connected to the output terminal of the second rectifier unit. The adjustment terminal of the adjustable resistor RW1 is connected to the first terminal of the resistor R43. The last terminal of the resistor R43 is connected to the first terminal of the capacitor C14 and the first terminal of the resistor R42. The last terminal of the resistor R42 is connected to the first terminal of the capacitor C12 and the second input terminal of the comparator U7B. The last terminal of the capacitor C12 is connected to the first terminal of the resistor R41. The output terminal of the comparator U7B is connected to the last terminal of the resistor R41 and the speed control unit. The last terminals of the resistor R39, the capacitor C10, the capacitor C14, and the adjustable resistor RW1 are all grounded.

[0012] According to some embodiments of the present invention, the motor steering sampling module includes a first optocoupler and a second optocoupler. The positive terminal of the emitter of the first optocoupler is connected to the first terminal of the power supply of the main wire feed motor, the negative terminal of the emitter of the first optocoupler is connected to the second terminal of the power supply of the main wire feed motor, and the light receiver of the first optocoupler is connected to the signal processing module. The positive terminal of the emitter of the second optocoupler is connected to the second terminal of the power supply of the main wire feed motor, the negative terminal of the emitter of the second optocoupler is connected to the first terminal of the power supply of the main wire feed motor, and the light receiver of the second optocoupler is connected to the signal processing module.

[0013] According to some embodiments of the present invention, the driving module includes semiconductor switching transistors Q1, Q2, Q5, and Q6. The input terminals of both switching transistors Q1 and Q2 are connected to a power supply. The output terminal of switching transistor Q1 is connected to the first terminal of the auxiliary wire feeding motor power supply and the input terminal of switching transistor Q5, respectively. The output terminal of switching transistor Q2 is connected to the second terminal of the auxiliary wire feeding motor power supply and the input terminal of switching transistor Q6, respectively. The output terminals of both switching transistors Q5 and Q6 are grounded. The signal processing module includes a first signal processing unit and a second signal processing unit. The first signal processing unit is connected to the photodetector of the first optocoupler, the motor start / stop state sampling module, and the speed control unit, respectively. The first signal processing unit is used for... The first sampling signal, the second sampling signal, and the third sampling signal are processed and output as a first PWM signal at the first control terminal and a second PWM signal at the second control terminal. The second signal processing unit is connected to the photodetector of the second optocoupler, the motor start / stop state sampling module, and the speed control unit, respectively. The second signal processing unit is used to process the first sampling signal, the second sampling signal, and the third sampling signal and output as a third PWM signal at the third control terminal and a fourth PWM signal at the fourth control terminal. The first control terminal of the first signal processing unit is connected to the controlled terminal of the switch Q1, the second control terminal of the first signal processing unit is connected to the controlled terminal of the switch Q5, the third control terminal of the second signal processing unit is connected to the controlled terminal of the switch Q2, and the fourth control terminal of the second signal processing unit is connected to the controlled terminal of the switch Q6.

[0014] According to some embodiments of the present invention, the first signal processing unit includes a first NAND gate, a first NOT gate, a first AND gate, a resistor R13, a capacitor C5, a semiconductor switch Q3, and a semiconductor switch Q4. The first input terminal of the first NAND gate is connected to the speed control unit to obtain a third sampling signal, and the second input terminal of the first NAND gate is connected to the photodetector of the first optocoupler to obtain a second sampling signal. The output terminal of the first NAND gate is connected to the input terminal of the first NOT gate, the first input terminal of the first AND gate, and the first end of the resistor R13. The tail end of 13 is connected to the head end of capacitor C5 and the second input end of the first AND gate respectively. The output end of the first NOT gate is connected to the input end of switch Q3 and the controlled end of switch Q1 respectively. The controlled end of switch Q3 is connected to the motor start / stop state sampling module to obtain the first sampling signal. The output end of the first AND gate is connected to the input end of switch Q4 and the controlled end of switch Q5 respectively. The controlled end of switch Q4 is connected to the motor start / stop state sampling module to obtain the first sampling signal. The output ends of switch Q3, switch Q4 and the tail end of capacitor C5 are all grounded.

[0015] The second signal processing unit includes a second NAND gate, a second NOT gate, a second AND gate, a resistor R35, a capacitor C9, a semiconductor switch Q7, and a semiconductor switch Q8. The first input terminal of the second NAND gate is connected to the speed control unit to obtain a third sampling signal. The second input terminal of the second NAND gate is connected to the photodetector of the second optocoupler to obtain a second sampling signal. The output terminal of the second NAND gate is connected to the input terminal of the second NOT gate, the first input terminal of the second AND gate, and the first end of the resistor R36. The tail ends of the resistor R36 are respectively... The first end of the capacitor C9 is connected to the second input end of the second AND gate. The output end of the second NOT gate is connected to the input end of the switch Q7 and the controlled end of the switch Q2. The controlled end of the switch Q7 is connected to the motor start / stop state sampling module to obtain the first sampling signal. The output end of the second AND gate is connected to the input end of the switch Q8 and the controlled end of the switch Q6. The controlled end of the switch Q8 is connected to the motor start / stop state sampling module to obtain the first sampling signal. The output ends of the switch Q6, the output ends of the switch Q8, and the tail end of the capacitor C9 are all grounded.

[0016] According to a second aspect of the present invention, a control method is applied to the synchronous wire feeding control device disclosed in any of the above embodiments. The control method includes: a motor start / stop state sampling module forming a first sampling signal characterizing the result of sampling the start / stop state of the main wire feeding motor; and a motor direction sampling module forming a second sampling signal characterizing the result of sampling the direction state of the main wire feeding motor.

[0017] The motor speed sampling module generates a third sampling signal to characterize the result of sampling the speed of the main wire feeding motor; the signal processing module generates a control signal based on the first sampling signal, the second sampling signal and the third sampling signal, and the control terminal of the signal processing module is connected to the drive module of the auxiliary wire feeding motor to output a control signal to control the operation of the drive module.

[0018] The control method according to embodiments of the present invention has at least the following beneficial effects:

[0019] The control method of the present invention is applied to the synchronous wire feeding control device disclosed in any of the above embodiments to output control signals to control the operation of the drive module, stabilize and synchronize the starting, direction and speed of the main wire feeding motor and the auxiliary wire feeding motor, ensure a stable supply of welding wire and improve welding quality.

[0020] According to a third aspect of the present invention, a welding machine includes a main wire feed motor, an auxiliary wire feed motor, and a synchronous wire feed control device disclosed in any of the above embodiments. The synchronous wire feed control device is connected to the main wire feed motor to obtain a first sampling signal, a second sampling signal, and a third sampling signal and to form a control signal. The synchronous wire feed control device is connected to the drive module of the auxiliary wire feed motor to output a control signal to control the operation of the drive module.

[0021] The welding equipment according to embodiments of the present invention has at least the following beneficial effects:

[0022] The welding machine equipment of the present invention uses the synchronous wire feeding control device disclosed in any of the above embodiments to detect the main wire feeding motor and control the drive of the auxiliary wire feeding motor. It does not require any changes to the original drive structure of the main wire feeding motor, making the structure simpler. It stably and synchronously synchronizes the start-up, direction and speed of the main wire feeding motor and the auxiliary wire feeding motor, ensuring a stable supply of welding wire and improving welding quality.

[0023] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is a schematic diagram of the welding machine equipment of the present invention, representing one embodiment.

[0026] Figure 2 This is a circuit diagram of the input connection module of one embodiment of the synchronous wire feeding control device of the present invention;

[0027] Figure 3This is a circuit diagram of the motor start / stop state sampling module of one embodiment of the synchronous wire feeding control device of the present invention.

[0028] Figure 4 This is a circuit diagram of the motor speed sampling module of one embodiment of the synchronous wire feeding control device of the present invention;

[0029] Figure 5 This is a circuit diagram of the first optocoupler in one embodiment of the synchronous wire feeding control device of the present invention;

[0030] Figure 6 This is a circuit diagram of the first signal processing unit of one embodiment of the synchronous wire feeding control device of the present invention;

[0031] Figure 7 This is a circuit diagram of the second optocoupler in one embodiment of the synchronous wire feeding control device of the present invention;

[0032] Figure 8 This is a circuit diagram of the second signal processing unit in one embodiment of the synchronous wire feeding control device of the present invention;

[0033] Figure 9 This is a circuit diagram of the drive module of one embodiment of the welding equipment of the present invention.

[0034] Figure label:

[0035] Input connection module 100; connection terminal group 110; first rectifier unit 120; motor start / stop status sampling module 200; motor direction sampling module 300; first optocoupler 310; second optocoupler 320; motor speed sampling module 400; comparison unit 410; first generation unit 420; second generation unit 430; second rectifier unit 440; speed control unit 450; signal processing module 500; first signal processing unit 510; first NAND gate 511; first NOT gate 512; first AND gate 513; first signal amplifier 514; second signal processing unit 520; second NAND gate 521; second NOT gate 522; second AND gate 523; second signal amplifier 524; main wire feed motor 600; auxiliary wire feed motor 700; drive module 800. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of this invention, it should be understood that the orientation descriptions, such as the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer", indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0038] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] like Figure 1 - Figure 9As shown, a synchronous wire feeding control device according to a first aspect embodiment of the present invention is applied to a welding machine. The welding machine includes a main wire feeding motor 600 and an auxiliary wire feeding motor 700. The synchronous wire feeding control device includes an input connection module 100, a motor start / stop state sampling module 200, a motor direction sampling module 300, a motor speed sampling module 400, and a signal processing module 500. The input connection module 100 is connected to the main wire feeding motor 600. The motor start / stop state sampling module 200 is connected to the input connection module 100 to form a first sampling signal. The first sampling signal is used to characterize the result of sampling the start / stop state of the main wire feeding motor 600. The motor direction sampling module 300 is connected to the input connection module 100. A second sampling signal is formed by connecting module 0 to form a second sampling signal, which is used to characterize the result of sampling the rotational state of the main wire feeding motor 600. The motor speed sampling module 400 is connected to the input connection module 100 to form a third sampling signal, which is used to characterize the result of sampling the speed of the main wire feeding motor 600. The input terminal of the signal processing module is connected to the motor start / stop state sampling module 200, the motor rotational state sampling module 300, and the motor speed sampling module 400 respectively to form a control signal based on the first sampling signal, the second sampling signal, and the third sampling signal. The control terminal of the signal processing module 500 is connected to the drive module 800 of the auxiliary wire feeding motor 700 to output a control signal to control the operation of the drive module 800.

[0041] This design can be applied to a welding machine. The main wire feeding motor 600 drives the main wire feeding wheel, and the auxiliary wire feeding motor 700 drives the auxiliary wire feeding wheel. The main wire feeding wheel and the auxiliary wire feeding wheel are arranged one behind the other in the wire feeding direction. The welding machine is also equipped with a control circuit board and a drive circuit board. The control circuit board can control the drive circuit board to drive the main wire feeding motor 600 according to the user's operation instructions. The synchronous wire feeding control device of this design can be installed in the welding machine, connected to the main wire feeding motor 600 through the input connection module 100, and then output control signals to control the operation of the drive module 800.

[0042] This invention relates to a synchronous wire feeding control device. An input connection module 100 connects to the main wire feeding motor 600 to obtain its operating status. Specifically, a motor start / stop state sampling module 200 samples the start / stop state of the main wire feeding motor 600 to form a first sampling signal; a motor direction sampling module 300 samples the direction state of the main wire feeding motor 600 to form a second sampling signal; and a motor speed sampling module 400 samples the speed of the main wire feeding motor 600 to form a third sampling signal. A signal processing module 500 generates a control signal based on the first, second, and third sampling signals, and uses this control signal to control the drive module 800 of the auxiliary wire feeding motor 700. This ensures that the start, direction, and speed of the auxiliary wire feeding motor 700 are synchronized with the main wire feeding motor 600, without requiring changes to the original drive structure of the main wire feeding motor 600, resulting in a simpler structure. This design stably synchronizes the start, direction, and speed of the main wire feeding motor 600 and the auxiliary wire feeding motor 700, ensuring a stable supply of welding wire and improving welding quality.

[0043] In some embodiments of the present invention, such as Figure 1 , 2 As shown, the input connection module 100 includes a connection terminal group 110 and a first rectifier unit 120. The connection terminal group 110 is connected to the two poles of the power supply terminal of the main wire feeding motor 600 to obtain the first drive current. The connection terminal group 110 is connected to the input terminals of the motor direction sampling module 300 and the first rectifier unit 120, respectively. The output terminal of the first rectifier unit 120 is connected to the motor start / stop state sampling module 200 and the motor speed sampling module 400, respectively.

[0044] The connector assembly 110 can be a conventional connector, and the main wire feed motor 600 can be a DC motor. The connector can be connected to the positive and negative terminals of the main wire feed motor 600's power supply. The connector has two ports that can be connected to the motor start / stop status sampling module 200, the motor direction sampling module 300, and the motor speed sampling module 400, respectively. Figure 2 The FM+ and FM- ports are connected, with the FM+ port connected to the positive terminal of the main wire feed motor 600 power supply and the FM- port connected to the negative terminal of the main wire feed motor 600 power supply.

[0045] When the main wire feeding motor 600 has a first driving current, it can indicate that the main wire feeding motor 600 is started. The direction of the first driving current can indicate the direction of rotation of the main wire feeding motor 600, and the magnitude of the first driving current can indicate the speed of the main wire feeding motor 600.

[0046] The motor direction sampling module 300 is connected to the connection terminal group 110 to detect the direction of the main wire feeding motor 600. The first rectifier unit 120 can be composed of multiple diodes to form a full-wave rectifier bridge or a half-wave rectifier bridge. The motor start-stop status sampling module 200 and the motor speed sampling module 400 determine whether the main wire feeding motor 600 is started and its speed based on the presence and magnitude of the first drive current.

[0047] In some embodiments of the present invention, the motor start / stop state sampling module 200 includes a semiconductor switch Q9, a semiconductor switch Q10, a capacitor C17, a resistor R47, a resistor R49, and a resistor R51. The controlled terminal of the switch Q9 is connected to the output terminal of the first rectifier unit 120. The output terminal of the switch Q9 is connected to the first terminal of the capacitor C17, the first terminal of the resistor R51, and the first terminal of the resistor R49. The tail terminal of the resistor R49 is connected to the controlled terminal of the switch Q10. The first terminal of the resistor R47 is connected to the input terminal of the switch Q10 and the signal processing module 500. The input terminal of the switch Q9 and the tail terminal of the resistor R47 are both connected to the power supply. The tail terminal of the resistor R51, the tail terminal of the capacitor C17, and the output terminal of the switch Q10 are all grounded.

[0048] Resistor R51 and capacitor C17 form a delay circuit. Generally speaking, the drive circuit board of the main wire feeding motor 600 is composed of semiconductor switching transistors. The control circuit board outputs a PWM signal to control the switching transistors to turn on and off, thereby driving the main wire feeding motor 600. Therefore, after the first drive current of the main wire feeding motor 600 is rectified by the first rectifier unit 120, there is still an AC component. Therefore, the motor start / stop state sampling module 200 sets a delay circuit. Switches Q9 and Q10 are n-type transistors or MOSFETs. When the main wire feeding motor 600 starts, the first drive current forms a high level to drive switch Q9 to conduct, capacitor C17 is quickly charged, and switch Q10 conducts. During the low-level part of the duty cycle of the first drive current, capacitor C17 slowly discharges through resistor R51, and switch Q10 remains on. The first sampling signal is output to the signal processing module 500 at the input terminal of switch Q10.

[0049] In some embodiments of the present invention, such as Figure 2 , 4As shown, the motor speed sampling module 400 includes a comparison unit 410, a first generation unit 420, a second generation unit 430, a second rectification unit 440, and a speed control unit 450. The input terminal of the first generation unit 420 is connected to the output terminal of the first rectification unit 420 to form a first comparison voltage based on the first drive current. The input terminal of the second rectification unit 440 is connected to the two poles of the power supply terminal of the auxiliary wire feeding motor 700 to obtain a second drive current. The input terminal of the second generation unit 430 is connected to the output terminal of the second rectification unit 440 to form a second comparison voltage based on the second drive current. The first input terminal of the comparison unit 410 is connected to the output terminal of the first generation unit 420, the second input terminal of the comparison unit 410 is connected to the output terminal of the second generation unit 430, and the output terminal of the comparison unit 410 is connected to the speed control unit 450. The speed control unit 450 forms a speed control signal as a third sampling signal based on the comparison result of the comparison unit 410. The speed control unit 450 is connected to the signal processing module 500.

[0050] The first generating unit 420 generates a first comparison voltage based on the first driving current. The input terminal of the second rectifier unit 440 can be connected to the positive and negative terminals of the power supply terminal of the auxiliary wire feeding motor 700. When the auxiliary wire feeding motor 700 is running, it can obtain the second driving current. The second generating unit 430 generates a second comparison voltage based on the second driving current. The comparison unit 410 compares the magnitudes of the first comparison voltage and the second comparison voltage. When the first comparison voltage is greater than the second comparison voltage or less than the second comparison voltage, different speed regulation signals are generated and provided to the signal processing module 500 to adjust the magnitude of the second driving current so that the magnitude of the second driving current tends to be equal to the first driving current, thereby ensuring the speed synchronization of the main wire feeding motor 600 and the auxiliary wire feeding motor 700.

[0051] In some embodiments of the present invention, the first generation unit 420 includes resistors R37 and R39 and capacitor C10; the comparison unit 410 includes comparator U7B, capacitor C12 and resistor R41; the second generation unit 430 includes resistors R42 and R43, an adjustable resistor RW1 and capacitor C14; the first end of resistor R37 is connected to the output terminal of the first rectification unit 120; the second end of resistor R37 is connected to the first end of resistor R39, the first end of capacitor C10, and the first input terminal of comparator U7B; the first end of adjustable resistor RW1 is connected to the second rectification unit 430. The output terminal of 40 is connected, the adjustment terminal of adjustable resistor RW1 is connected to the first terminal of resistor R43, the tail terminal of resistor R43 is connected to the first terminal of capacitor C14 and the first terminal of resistor R42 respectively, the tail terminal of resistor R42 is connected to the first terminal of capacitor C12 and the second input terminal of comparator U7B respectively, the tail terminal of capacitor C12 is connected to the first terminal of resistor R41, the output terminal of comparator U7B is connected to the tail terminal of resistor R41 and the speed control unit 450 respectively, and the tail terminals of resistor R39, capacitor C10, capacitor C14 and adjustable resistor RW1 are all grounded.

[0052] The user can adjust the resistance value of the adjustable resistor RW1 according to the deviation between the main wire feeding motor 600 and the auxiliary wire feeding motor 700, as well as the requirements of the resistor and capacitor parameters in the first generation unit 420 and the second generation unit 430. The comparator U7B and the resistor R41 form a negative feedback voltage comparison circuit. The comparator U7B outputs the comparison result. The speed control unit 450 can be a conventional PWM modulation chip and its auxiliary circuits. The speed control unit 450 generates a PWM speed control signal based on the comparison result as the third sampling signal.

[0053] In some embodiments of the present invention, such as Figure 2 , 5 As shown in Figures 6, 7, 8, and 9, the motor steering sampling module 300 includes a first optocoupler 310 and a second optocoupler 320. The positive terminal of the emitter of the first optocoupler 310 is connected to the first terminal of the power supply of the main wire feeding motor 600, and the negative terminal of the emitter of the first optocoupler 310 is connected to the second terminal of the power supply of the main wire feeding motor 600. The light receiver of the first optocoupler 310 is connected to the signal processing module 500. The positive terminal of the emitter of the second optocoupler 320 is connected to the second terminal of the power supply of the main wire feeding motor 600, and the negative terminal of the emitter of the second optocoupler 320 is connected to the first terminal of the power supply of the main wire feeding motor 600. The light receiver of the second optocoupler 320 is connected to the signal processing module 500.

[0054] The emitters of the first optocoupler 310 and the second optocoupler 320 are respectively connected to the two poles of the power supply terminal of the main wire feed motor 600. When the first driving current flows from the first pole to the second pole, the emitter of the first optocoupler 310 lights up and the emitter of the second optocoupler 320 turns off. When the first driving current flows from the second pole to the first pole, the emitter of the first optocoupler 310 turns off and the emitter of the second optocoupler 320 lights up. The signal processing module 500 is connected to the light receiver of the first optocoupler 310 and the light receiver of the second optocoupler 320 respectively to obtain the second sampling signal.

[0055] Specifically, the drive module 800 of the auxiliary wire feeding motor 700 may include semiconductor switching transistors Q1, Q2, Q5, and Q6. The input terminals of switching transistors Q1 and Q2 are both connected to the power supply. The output terminal of switching transistor Q1 is connected to the first pole of the power supply terminal of the auxiliary wire feeding motor 700 and the input terminal of switching transistor Q5, respectively. The output terminal of switching transistor Q2 is connected to the second pole of the power supply terminal of the auxiliary wire feeding motor 700 and the input terminal of switching transistor Q6, respectively. The output terminals of switching transistors Q5 and Q6 are both grounded.

[0056] The signal processing module 500 includes a first signal processing unit 510 and a second signal processing unit 520. The first signal processing unit 510 is connected to the photodetector of the first optocoupler 310, the motor start / stop state sampling module 200, and the speed control unit 450, respectively. The first signal processing unit 510 processes the first sampled signal, the second sampled signal, and the third sampled signal, and outputs a first PWM signal at the first control terminal and a second PWM signal at the second control terminal. The second signal processing unit 520 is connected to the photodetector of the second optocoupler 320 and the motor start / stop state sampling module 200, respectively. The system is connected to a speed control unit 450. The second signal processing unit 520 processes the first sampling signal, the second sampling signal, and the third sampling signal and outputs a third PWM signal at the third control terminal and a fourth PWM signal at the fourth control terminal. The first control terminal of the first signal processing unit 510 is connected to the controlled terminal of the switching transistor Q1. The second control terminal of the first signal processing unit 510 is connected to the controlled terminal of the switching transistor Q5. The third control terminal of the second signal processing unit 520 is connected to the controlled terminal of the switching transistor Q2. The fourth control terminal of the second signal processing unit 520 is connected to the controlled terminal of the switching transistor Q6.

[0057] Specifically, the first control terminal and the second control terminal of the first signal processing unit 510 can be connected to the first signal amplifier 514. The first signal amplifier 514 amplifies the first PWM signal and the second PWM signal and then provides them to the controlled terminals of the switching transistors Q1 and Q5. Similarly, the third control terminal and the fourth control terminal of the second signal processing unit 520 can be connected to the second signal amplifier 524. The second signal amplifier 524 amplifies the third PWM signal and the fourth PWM signal and then provides them to the controlled terminals of the switching transistors Q2 and Q6.

[0058] When the main wire feeding motor 600 starts and the first drive current flows from the first pole to the second pole of the main wire feeding motor 600, the switching transistors Q1 and Q6 operate on and off, forming a second drive current that also flows from the first pole to the second pole of the auxiliary wire feeding motor 700. Based on the speed regulation signal, a first PWM signal and a fourth PWM signal are generated to match each other, which control the on and off frequency of the switching transistors Q1 and Q6 respectively, thereby adjusting the speed of the auxiliary wire feeding motor 700, while the switching transistors Q2 and Q5 remain off.

[0059] Similarly, when the main wire feeding motor 600 starts and the first driving current flows from the second pole to the first pole of the main wire feeding motor 600, the switching transistors Q2 and Q5 operate on and off, forming a second driving current that also flows from the second pole to the first pole of the auxiliary wire feeding motor 700. Based on the speed regulation signal, a matching second PWM signal and a third PWM signal are formed to control the on and off frequencies of the switching transistors Q2 and Q5, thereby adjusting the speed of the auxiliary wire feeding motor 700, while the switching transistors Q1 and Q6 remain off.

[0060] In some embodiments of the present invention, such as Figure 6 , 8As shown, the first signal processing unit 510 includes a first NAND gate 511, a first NOT gate 512, a first AND gate 513, a resistor R13, a capacitor C5, a semiconductor switch Q3, and a semiconductor switch Q4. The first input terminal of the first NAND gate 511 is connected to the speed control unit 450 to obtain a third sampling signal. The second input terminal of the first NAND gate 511 is connected to the photodetector of the first optocoupler 310 to obtain a second sampling signal. The output terminal of the first NAND gate 511 is connected to the input terminal of the first NOT gate 512, the first input terminal of the first AND gate 513, and the first end of the resistor R13. The tail end of resistor R13 is connected to the head end of capacitor C5 and the second input end of first AND gate 513 respectively. The output end of first NOT gate 512 is connected to the input end of switch Q3 and the controlled end of switch Q1 respectively. The controlled end of switch Q3 is connected to motor start / stop state sampling module 200 to obtain the first sampling signal. The output end of first AND gate 513 is connected to the input end of switch Q4 and the controlled end of switch Q5 respectively. The controlled end of switch Q4 is connected to motor start / stop state sampling module 200 to obtain the first sampling signal. The output ends of switch Q3, switch Q4 and the tail end of capacitor C5 are all grounded.

[0061] The second signal processing unit 520 includes a second NAND gate 521, a second NOT gate 522, a second AND gate 523, a resistor R35, a capacitor C9, a semiconductor switch Q7, and a semiconductor switch Q8. The first input terminal of the second NAND gate 521 is connected to the speed control unit 450 to obtain a third sampling signal. The second input terminal of the second NAND gate 521 is connected to the photodetector of the second optocoupler 320 to obtain a second sampling signal. The output terminal of the second NAND gate 521 is connected to the input terminal of the second NOT gate 522, the first input terminal of the second AND gate 523, and the first terminal of the resistor R36. The tail end of 36 is connected to the head end of capacitor C9 and the second input end of the second AND gate 523, respectively. The output end of the second NOT gate 522 is connected to the input end of switch Q7 and the controlled end of switch Q2, respectively. The controlled end of switch Q7 is connected to the motor start / stop state sampling module 200 to obtain the first sampling signal. The output end of the second AND gate 523 is connected to the input end of switch Q8 and the controlled end of switch Q6, respectively. The controlled end of switch Q8 is connected to the motor start / stop state sampling module 200 to obtain the first sampling signal. The output ends of switch Q6, switch Q8 and the tail end of capacitor C9 are all grounded.

[0062] Taking the main wire feeding motor 600 as starting and the first drive current flowing from the first pole to the second pole of the main wire feeding motor 600 as an example, since the main wire feeding motor 600 is starting, the terminal voltage of the input terminal of the switch Q10 is always low. Switches Q3, Q4, Q7 and Q8 can be n-type transistors or MOSFETs. Switches Q3, Q4, Q7 and Q8 remain off. When the main wire feeding motor 600 is off, switches Q3, Q4, Q7 and Q8 remain on. Switches Q1, Q2, Q5 and Q6 can be n-type transistors or MOSFETs. They all remain off. No second drive current flows through the auxiliary wire feeding motor 700.

[0063] In the first signal processing unit 510, the second input terminal of the first NAND gate 511 is always a high-level input. The speed control unit 450 outputs a speed control signal as a PWM signal. When the first input terminal of the first NAND gate 511 is also a high-level input, the first NAND gate 511 outputs a low level. In other cases, it is a high level. When the first NAND gate 511 outputs a low level, the first NOT gate 512 outputs a high level, and the first AND gate 513 outputs a low level. Under the drive of the speed control signal, the first input terminal of the first NAND gate 511 briefly switches to a low-level input, and the first NAND gate 511 briefly outputs a high level. Due to the delay effect of resistor R13 and capacitor C5, the first AND gate 513 maintains a low-level output.

[0064] In the second signal processing unit 520, the second input terminal of the first NAND gate 511 is always a low-level input, the first NAND gate 511 outputs a high level, the first NOT gate 512 outputs a low level, and the first AND gate 513 outputs a high level.

[0065] The main wire feeding motor 600 starts and the first driving current flows from the second pole to the first pole of the main wire feeding motor 600 in the opposite direction, which will not be elaborated here.

[0066] According to a second aspect of the present invention, the control method is applied to the synchronous wire feeding control device disclosed in any of the above embodiments. The control method includes: a motor start / stop state sampling module 200 forming a first sampling signal characterizing the result of sampling the start / stop state of the main wire feeding motor 600; a motor direction sampling module 300 forming a second sampling signal characterizing the result of sampling the direction state of the main wire feeding motor 600; a motor speed sampling module 400 forming a third sampling signal characterizing the result of sampling the speed of the main wire feeding motor 600; and a signal processing module 500 forming a control signal based on the first sampling signal, the second sampling signal, and the third sampling signal. The control terminal of the signal processing module 500 is connected to the drive module 800 of the auxiliary wire feeding motor 700 to output a control signal to control the operation of the drive module 800.

[0067] The control method of the present invention is applied to the synchronous wire feeding control device disclosed in any of the above embodiments to output control signals to control the operation of the drive module 800, stabilize and synchronize the starting, direction and speed of the main wire feeding motor 600 and the auxiliary wire feeding motor 700, ensure a stable supply of welding wire and improve welding quality.

[0068] According to a third aspect of the present invention, a welding machine includes a main wire feed motor 600, an auxiliary wire feed motor 700, and a synchronous wire feed control device disclosed in any of the above embodiments. The synchronous wire feed control device is connected to the main wire feed motor 600 to obtain a first sampling signal, a second sampling signal, and a third sampling signal and to form a control signal. The synchronous wire feed control device is connected to the drive module 800 of the auxiliary wire feed motor 700 to output a control signal to control the operation of the drive module 800.

[0069] The welding machine equipment of the present invention uses the synchronous wire feeding control device disclosed in any of the above embodiments to detect the main wire feeding motor and control the drive of the auxiliary wire feeding motor. It does not require any changes to the original drive structure of the main wire feeding motor, making the structure simpler. It stably and synchronously synchronizes the start-up, direction and speed of the main wire feeding motor and the auxiliary wire feeding motor, ensuring a stable supply of welding wire and improving welding quality.

[0070] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A synchronous wire feeding control device, applied to welding equipment, the welding equipment including a main wire feeding motor and an auxiliary wire feeding motor, characterized in that, The synchronous wire feeding control device includes: An input connection module is used to connect to the main wire feeding motor; A motor start / stop state sampling module is connected to the input connection module to form a first sampling signal, which is used to characterize the result of sampling the start / stop state of the main wire feeding motor. A motor steering sampling module is connected to the input connection module to form a second sampling signal, which is used to characterize the result of sampling the steering state of the main wire feeding motor. A motor speed sampling module is connected to the input connection module to form a third sampling signal, which is used to characterize the result of sampling the speed of the main wire feeding motor; The signal processing module has its input terminals connected to the motor start / stop state sampling module, the motor direction sampling module, and the motor speed sampling module, respectively, to form a control signal based on the first sampling signal, the second sampling signal, and the third sampling signal. The control terminal of the signal processing module is connected to the drive module of the auxiliary wire feeding motor to output a control signal to control the operation of the drive module. The input connection module includes a connection terminal group and a first rectifier unit. The connection terminal group is connected to the two poles of the power supply terminal of the main wire feeding motor to obtain the first drive current. The connection terminal group is connected to the motor direction sampling module and the input terminal of the first rectifier unit. The output terminal of the first rectifier unit is connected to the motor start / stop state sampling module and the motor speed sampling module. The motor speed sampling module includes a comparison unit, a first generation unit, a second generation unit, a second rectification unit, and a speed control unit. The input terminal of the first generation unit is connected to the output terminal of the first rectification unit to generate a first comparison voltage based on the first drive current. The input terminal of the second rectification unit is connected to the two poles of the power supply terminal of the auxiliary wire feeding motor to obtain a second drive current. The input terminal of the second generation unit is connected to the output terminal of the second rectification unit to generate a second comparison voltage based on the second drive current. The first input terminal of the comparison unit is connected to the output terminal of the first generation unit, the second input terminal of the comparison unit is connected to the output terminal of the second generation unit, and the output terminal of the comparison unit is connected to the speed control unit. The speed control unit generates a speed control signal as a third sampling signal based on the comparison result of the comparison unit. The speed control unit is connected to the signal processing module.

2. The synchronous wire feeding control device according to claim 1, characterized in that: The motor start / stop state sampling module includes a semiconductor switching transistor Q9, a semiconductor switching transistor Q10, a capacitor C17, a resistor R47, a resistor R49, and a resistor R51. The controlled terminal of the switching transistor Q9 is connected to the output terminal of the first rectifier unit. The output terminal of the switching transistor Q9 is connected to the first terminal of the capacitor C17, the first terminal of the resistor R51, and the first terminal of the resistor R49. The tail terminal of the resistor R49 is connected to the controlled terminal of the switching transistor Q10. The first terminal of the resistor R47 is connected to the input terminal of the switching transistor Q10 and the signal processing module. The input terminal of the switching transistor Q9 and the tail terminal of the resistor R47 are both connected to the power supply. The tail terminal of the resistor R51, the tail terminal of the capacitor C17, and the output terminal of the switching transistor Q10 are all grounded.

3. The synchronous wire feeding control device according to claim 1, characterized in that: The first generating unit includes resistors R37 and R39, and capacitor C10. The comparison unit includes comparator U7B, capacitor C12, and resistor R41. The second generating unit includes resistors R42 and R43, an adjustable resistor RW1, and capacitor C14. The first end of resistor R37 is connected to the output terminal of the first rectifier unit, and the second end of resistor R37 is connected to the first end of resistor R39, the first end of capacitor C10, and the first input terminal of comparator U7B. The first end of the adjustable resistor RW1 is connected to the output terminal of the second rectifier unit. The adjustment terminal of resistor RW1 is connected to the first terminal of resistor R43. The last terminal of resistor R43 is connected to the first terminal of capacitor C14 and the first terminal of resistor R42. The last terminal of resistor R42 is connected to the first terminal of capacitor C12 and the second input terminal of comparator U7B. The last terminal of capacitor C12 is connected to the first terminal of resistor R41. The output terminal of comparator U7B is connected to the last terminal of resistor R41 and the speed control unit. The last terminals of resistor R39, capacitor C10, capacitor C14, and adjustable resistor RW1 are all grounded.

4. The synchronous wire feeding control device according to claim 1, characterized in that: The motor steering sampling module includes a first optocoupler and a second optocoupler. The positive terminal of the emitter of the first optocoupler is connected to the first terminal of the power supply of the main wire feed motor, and the negative terminal of the emitter of the first optocoupler is connected to the second terminal of the power supply of the main wire feed motor. The light receiver of the first optocoupler is connected to the signal processing module. The positive terminal of the emitter of the second optocoupler is connected to the second terminal of the power supply of the main wire feed motor, and the negative terminal of the emitter of the second optocoupler is connected to the first terminal of the power supply of the main wire feed motor. The light receiver of the second optocoupler is connected to the signal processing module.

5. The synchronous wire feeding control device according to claim 4, characterized in that: The driving module includes semiconductor switching transistors Q1, Q2, Q5, and Q6. The input terminals of switching transistors Q1 and Q2 are both connected to the power supply. The output terminal of switching transistor Q1 is connected to the first pole of the auxiliary wire feeding motor power supply and the input terminal of switching transistor Q5, respectively. The output terminal of switching transistor Q2 is connected to the second pole of the auxiliary wire feeding motor power supply and the input terminal of switching transistor Q6, respectively. The output terminals of switching transistors Q5 and Q6 are both grounded. The signal processing module includes a first signal processing unit and a second signal processing unit. The first signal processing unit is connected to the photodetector of the first optocoupler, the motor start / stop state sampling module, and the speed control unit, respectively. The first signal processing unit processes the first sampled signal, the second sampled signal, and the third sampled signal and outputs a first PWM signal at the first control terminal and a second PWM signal at the second control terminal. The second signal processing unit is connected to the photodetector of the second optocoupler, the motor start / stop state sampling module, and the speed control unit, respectively. The second signal processing unit processes the first sampled signal, the second sampled signal, and the third sampled signal and outputs a third PWM signal at the third control terminal and a fourth PWM signal at the fourth control terminal. The first control terminal of the first signal processing unit is connected to the controlled terminal of the switch Q1, the second control terminal of the first signal processing unit is connected to the controlled terminal of the switch Q5, the third control terminal of the second signal processing unit is connected to the controlled terminal of the switch Q2, and the fourth control terminal of the second signal processing unit is connected to the controlled terminal of the switch Q6.

6. The synchronous wire feeding control device according to claim 5, characterized in that: The first signal processing unit includes a first NAND gate, a first NOT gate, a first AND gate, a resistor R13, a capacitor C5, a semiconductor switch Q3, and a semiconductor switch Q4. The first input terminal of the first NAND gate is connected to the speed control unit to obtain a third sampling signal. The second input terminal of the first NAND gate is connected to the photodetector of the first optocoupler to obtain a second sampling signal. The output terminal of the first NAND gate is connected to the input terminal of the first NOT gate, the first input terminal of the first AND gate, and the first end of the resistor R13. The tail end of the resistor R13 is... The first AND gate is connected to the first terminal of capacitor C5 and the second input terminal of the first AND gate. The output terminal of the first NOT gate is connected to the input terminal of switch Q3 and the controlled terminal of switch Q1. The controlled terminal of switch Q3 is connected to the motor start / stop state sampling module to obtain the first sampling signal. The output terminal of the first AND gate is connected to the input terminal of switch Q4 and the controlled terminal of switch Q5. The controlled terminal of switch Q4 is connected to the motor start / stop state sampling module to obtain the first sampling signal. The output terminals of switch Q3, switch Q4 and capacitor C5 are all grounded. The second signal processing unit includes a second NAND gate, a second NOT gate, a second AND gate, a resistor R35, a capacitor C9, a semiconductor switch Q7, and a semiconductor switch Q8. The first input terminal of the second NAND gate is connected to the speed control unit to obtain a third sampling signal. The second input terminal of the second NAND gate is connected to the photodetector of the second optocoupler to obtain a second sampling signal. The output terminal of the second NAND gate is connected to the input terminal of the second NOT gate, the first input terminal of the second AND gate, and the first end of the resistor R36. The tail ends of the resistor R36 are respectively... The first end of the capacitor C9 is connected to the second input end of the second AND gate. The output end of the second NOT gate is connected to the input end of the switch Q7 and the controlled end of the switch Q2. The controlled end of the switch Q7 is connected to the motor start / stop state sampling module to obtain the first sampling signal. The output end of the second AND gate is connected to the input end of the switch Q8 and the controlled end of the switch Q6. The controlled end of the switch Q8 is connected to the motor start / stop state sampling module to obtain the first sampling signal. The output ends of the switch Q6, the output ends of the switch Q8, and the tail end of the capacitor C9 are all grounded.

7. A control method, characterized in that, The control method, applied to the synchronous wire feeding control device as described in any one of claims 1-6, comprises: The motor start / stop state sampling module generates a first sampling signal to characterize the result of sampling the start / stop state of the main wire feeding motor; The motor direction sampling module generates a second sampling signal to characterize the result of sampling the direction state of the main wire feed motor; The motor speed sampling module generates a third sampling signal to characterize the result of sampling the speed of the main wire feed motor; The signal processing module generates a control signal based on the first sampling signal, the second sampling signal, and the third sampling signal. The control terminal of the signal processing module is connected to the drive module of the auxiliary wire feeding motor to output a control signal to control the operation of the drive module.

8. A welding device, characterized in that, It includes a main wire feeding motor, an auxiliary wire feeding motor, and a synchronous wire feeding control device as described in any one of claims 1-6. The synchronous wire feeding control device is connected to the main wire feeding motor to obtain a first sampling signal, a second sampling signal, and a third sampling signal and to form a control signal. The synchronous wire feeding control device is connected to the drive module of the auxiliary wire feeding motor to output a control signal to control the operation of the drive module.

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