Synchronous wire feeding control device and control method and welding machine equipment

Abstract

The invention discloses a synchronous wire feeding control device, a synchronous wire feeding control method and welding machine equipment, and the synchronous wire feeding control device comprises an input connection module, a motor start-stop state sampling module, a motor rotation direction sampling module, a motor rotation speed sampling module and a signal processing module, the motor start-stop state sampling module is connected with the input connection module, the motor rotation direction sampling module is connected with the input connection module, and the motor rotation speed sampling module is connected with the input connection module. The input end of the signal processing module is respectively connected with the motor start-stop state sampling module, the motor steering sampling module and the motor rotating speed sampling module so as to form a control signal according to the first sampling signal, the second sampling signal and the third sampling signal; the control end of the signal processing module outputs a control signal to control the driving module of the auxiliary wire feeding motor to operate, starting, steering and rotating speed of the double motors are synchronized, stable supply of welding wires is guaranteed, and the welding quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuit control, and in particular to a synchronous wire feeding control device and control method, and welding machine equipment. Background Art

[0002] Existing gas shielded welding machines usually require a motor to drive the wire reel to rotate for wire feeding. When used in industries such as tank trucks and shipbuilding, due to the large operating range, long-distance wire feeding is required, and the welding wire used in this industry has high toughness (such as carbon steel, stainless steel, etc.), the wire feeding resistance in application scenarios with a wire diameter of 1.4mm, 1.6mm and above is much greater than that in conventional application scenarios, and the traditional single-motor wire feeding device cannot meet the stable wire feeding requirements.

[0003] In response to this type of problem, a solution of adding an auxiliary wire feeding motor on the basis of the main wire feeding motor has been proposed. The main wire feeding motor drives the main wire reel, and the auxiliary wire feeding motor drives the auxiliary wire reel. The main wire reel and the auxiliary wire reel are arranged front and back in the wire feeding direction. The main wire feeding motor and the auxiliary wire feeding motor run synchronously, thereby increasing the wire feeding torque and achieving stable wire feeding. However, the implementation of the above solution requires that the main wire feeding motor and the auxiliary wire feeding motor be started synchronously and run at the same direction and speed. In the past, the main wire feeding motor and the auxiliary wire feeding motor were connected in parallel. Although synchronous start and operation at the same direction can be achieved, the loads applied to the main wire feeding motor and the auxiliary wire feeding motor are different. In the case of a sudden change in any load of the main wire feeding motor and the auxiliary wire feeding motor, it is difficult to achieve the goal of dual motor speed synchronization. The asynchronous speed of the dual motors will cause unstable wire feeding and affect the quality of the welding weld. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a synchronous wire feeding control device and control method, and a welding machine device, which can stabilize the start, direction and speed of the synchronous main wire feeding motor and the auxiliary wire feeding motor, ensure the stable supply of welding wire, and improve the welding quality.

[0005] A synchronous wire feeding control device according to an embodiment of the first aspect of the present invention is applied to a welding machine device, wherein the welding machine device comprises a main wire feeding motor and an auxiliary wire feeding motor, and the synchronous wire feeding control device comprises: an input connection module, which is used to connect to the main wire feeding motor; a motor start and stop state sampling module, which is connected to the input connection module to form a first sampling signal, and the first sampling signal is used to characterize the result of sampling the start and stop states of the main wire feeding motor; a motor steering sampling module, which is connected to the input connection module to form a second sampling signal, and the second sampling signal is used to characterize the result of sampling the steering state of the main wire feeding motor; a motor speed sampling module, which is connected to the input connection module to form a third sampling signal, and the third sampling signal is used to characterize the result of sampling the speed of the main wire feeding motor; a signal processing module, wherein the input end of the signal processing module is respectively connected to the motor start and stop state sampling module, the motor steering sampling module and the motor speed sampling module to form a control signal according to the first sampling signal, the second sampling signal and the third sampling signal, and the control end 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.

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

[0007] The synchronous wire feeding control device of the present invention has an input connection module connected to the main wire feeding motor to obtain the operating status of the main wire feeding motor, wherein the motor start and stop state sampling module samples the start and stop state of the main wire feeding motor to form a first sampling signal, the motor steering sampling module samples the steering state of the main wire feeding motor to form a second sampling signal, and the motor speed sampling module samples the speed of the main wire feeding motor to form a third sampling signal. The signal processing module forms a control signal according to the first sampling signal, the second sampling signal and the third sampling signal, and uses the control signal to control the operation of the driving module of the auxiliary wire feeding motor, so that the starting, steering and speed of the auxiliary wire feeding motor are synchronized with the main wire feeding motor, and there is no need to change the original driving structure of the main wire feeding motor, and the structure is simpler. The design stably synchronizes the starting, steering and speed of the main wire feeding motor and the auxiliary wire feeding motor, ensures the stable supply of welding wire, and improves the welding quality.

[0008] According to some embodiments of the present invention, the input connection module includes a connection end group and a first rectifier unit, the connection end group is respectively connected to the two poles of the power supply end of the main wire feeding motor to obtain a first driving current, the connection end group is respectively connected to the motor steering sampling module and the input end of the first rectifier unit, and the output end of the first rectifier unit is respectively connected to the motor start and 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 tube Q9, a semiconductor switch tube Q10, a capacitor C17, a resistor R47, a resistor R49 and a resistor R51. The controlled end of the switch tube Q9 is connected to the output end of the first rectifier unit, the output end of the switch tube Q9 is respectively connected to the head end of the capacitor C17, the head end of the resistor R51 and the head end of the resistor R49, the tail end of the resistor R49 is respectively connected to the controlled end of the switch tube Q10, the head end of the resistor R47 is respectively connected to the input end of the switch tube Q10 and the signal processing module, the input end of the switch tube Q9 and the tail end of the resistor R47 are both connected to the power supply, and the tail end of the resistor R51, the tail end of the capacitor C17 and the output end of the switch tube 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 rectifier unit and a speed control unit, the input end of the first generation unit is connected to the output end of the first rectifier unit to form a first comparison voltage according to the first drive current, the input end of the second rectifier unit is respectively connected to the two poles of the power supply end of the auxiliary wire feeding motor to obtain the second drive current, the input end of the second generation unit is connected to the output end of the second rectifier unit to form a second comparison voltage according to the second drive current, the first input end of the comparison unit is connected to the output end of the first generation unit, the second input end of the comparison unit is connected to the output end of the second generation unit, the output end of the comparison unit is connected to the speed control unit, the speed control unit forms a speed control signal as a third sampling signal according to the comparison result of the comparison unit, and 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 a resistor R37, a resistor R39 and a capacitor C10, the comparing unit includes a comparator U7B, a capacitor C12 and a resistor R41, the second generating unit includes a resistor R42, a resistor R43, an adjustable resistor RW1 and a capacitor C14, the head end of the resistor R37 is connected to the output end of the first rectifying unit, the tail end of the resistor R37 is respectively connected to the head end of the resistor R39, the head end of the capacitor C10 and the first input end of the comparator U7B, the head end of the adjustable resistor RW1 is connected to the output end of the second rectifying unit, The adjustment end of the adjustable resistor RW1 is connected to the head end of the resistor R43, the tail end of the resistor R43 is respectively connected to the head end of the capacitor C14 and the head end of the resistor R42, the tail end of the resistor R42 is respectively connected to the head end of the capacitor C12 and the second input end of the comparator U7B, the tail end of the capacitor C12 is connected to the head end of the resistor R41, the output end of the comparator U7B is respectively connected to the tail end of the resistor R41 and the speed control unit, and the tail end of the resistor R39, the tail end of the capacitor C10, the tail end of the capacitor C14 and the tail end of the adjustable resistor RW1 are all grounded.

[0012] According to some embodiments of the present invention, the motor steering sampling module includes a first photoelectric coupler and a second photoelectric coupler, the positive pole of the light emitter of the first photoelectric coupler is connected to the first pole of the power supply end of the main wire feeding motor, the negative pole of the light emitter of the first photoelectric coupler is connected to the second pole of the power supply end of the main wire feeding motor, the light receiver of the first photoelectric coupler is connected to the signal processing module, the positive pole of the light emitter of the second photoelectric coupler is connected to the second pole of the power supply end of the main wire feeding motor, the negative pole of the light emitter of the second photoelectric coupler is connected to the first pole of the power supply end of the main wire feeding motor, and the light receiver of the second photoelectric coupler is connected to the signal processing module.

[0013] According to some embodiments of the present invention, the driving module includes a semiconductor switch tube Q1, a semiconductor switch tube Q2, a semiconductor switch tube Q5 and a semiconductor switch tube Q6, the input end of the switch tube Q1 and the input end of the switch tube Q2 are both connected to the power supply, the output end of the switch tube Q1 is respectively connected to the first pole of the auxiliary wire feeding motor power supply end and the input end of the switch tube Q5, the output end of the switch tube Q2 is respectively connected to the second pole of the auxiliary wire feeding motor power supply end and the input end of the switch tube Q6, and the output end of the switch tube Q5 and the output end of the switch tube 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 respectively connected to the light receiver of the first photoelectric coupler, the motor start and stop state sampling module and the speed control unit, and the first signal processing unit is used to The first sampling signal, the second sampling signal and the third sampling signal are processed and a first PWM signal is output at the first control end and a second PWM signal is output at the second control end. The second signal processing unit is respectively connected to the light receiver of the second photoelectric coupler, the motor start-stop state sampling module and the speed control unit. The second signal processing unit is used to process the first sampling signal, the second sampling signal and the third sampling signal and output a third PWM signal at the third control end and a fourth PWM signal at the fourth control end. The first control end of the first signal processing unit is connected to the controlled end of the switch tube Q1, the second control end of the first signal processing unit is connected to the controlled end of the switch tube Q5, the third control end of the second signal processing unit is connected to the controlled end of the switch tube Q2, and the fourth control end of the second signal processing unit is connected to the controlled end of the switch tube 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 tube Q3, and a semiconductor switch tube Q4, the first input end of the first NAND gate is connected to the speed control unit to obtain a third sampling signal, the second input end of the first NAND gate is connected to the light receiver of the first photoelectric coupler to obtain a second sampling signal, the output end of the first NAND gate is respectively connected to the input end of the first NOT gate, the first input end of the first AND gate, and the first end of the resistor R13, the resistor R The tail end of 13 is respectively connected to the head end of the capacitor C5 and the second input end of the first AND gate, the output end of the first NOT gate is respectively connected to the input end of the switch tube Q3 and the controlled end of the switch tube Q1, the controlled end of the switch tube Q3 is connected to the motor start-stop state sampling module to obtain a first sampling signal, the output end of the first AND gate is respectively connected to the input end of the switch tube Q4 and the controlled end of the switch tube Q5, the controlled end of the switch tube Q4 is connected to the motor start-stop state sampling module to obtain the first sampling signal, and the output end of the switch tube Q3, the output end of the switch tube Q4 and the tail end of the 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 tube Q7 and a semiconductor switch tube Q8, the first input end of the second NAND gate is connected to the speed control unit to obtain a third sampling signal, the second input end of the second NAND gate is connected to the light receiver of the second photoelectric coupler to obtain a second sampling signal, the output end of the second NAND gate is respectively connected to the input end of the second NOT gate, the first input end of the second AND gate and the head end of the resistor R36, the tail end of the resistor R36 is respectively connected to the input end of the second NOT gate, the first input end of the second AND gate and the head end of the resistor R36. The first end of the capacitor C9 and the second input end of the second AND gate are connected, the output end of the second NOT gate is respectively connected to the input end of the switch tube Q7 and the controlled end of the switch tube Q2, the controlled end of the switch tube Q7 is connected to the motor start-stop state sampling module to obtain a first sampling signal, the output end of the second AND gate is respectively connected to the input end of the switch tube Q8 and the controlled end of the switch tube Q6, the controlled end of the switch tube Q8 is connected to the motor start-stop state sampling module to obtain a first sampling signal, and the output end of the switch tube Q6, the output end of the switch tube Q8 and the tail end of the capacitor C9 are all grounded.

[0016] The control method according to the second aspect of the present invention is applied to the synchronous wire feeding control device disclosed in any of the above embodiments, and the control method includes: a motor start-stop state sampling module forms a first sampling signal for representing the result of sampling the start-stop state of the main wire feeding motor; a motor steering sampling module forms a second sampling signal for representing the result of sampling the steering state of the main wire feeding motor;

[0017] The motor speed sampling module forms a third sampling signal for characterizing the result of sampling the speed of the main wire feeding motor; the signal processing module forms a control signal based on the first sampling signal, the second sampling signal and the third sampling signal, and the control end of the signal processing module is connected to the driving module of the auxiliary wire feeding motor to output a control signal to control the operation of the driving module.

[0018] The control method according to the embodiment 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 a control signal to control the operation of the driving module, stabilize the start, direction and speed of the synchronous main wire feeding motor and the auxiliary wire feeding motor, ensure the stable supply of welding wire, and improve the welding quality.

[0020] According to the welding machine equipment of the third aspect embodiment of the present invention, it includes a main wire feeding motor, an auxiliary wire feeding motor and the synchronous wire feeding control device disclosed in any of the above embodiments, 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 form a control signal, and the synchronous wire feeding control device is connected to the driving module of the auxiliary wire feeding motor to output a control signal to control the operation of the driving module.

[0021] The welding machine device according to the embodiment 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 driving of the auxiliary wire feeding motor. There is no need to change the original driving structure of the main wire feeding motor. The structure is simpler and can stably and synchronously control the starting, steering and speed of the main wire feeding motor and the auxiliary wire feeding motor, thereby ensuring a stable supply of welding wire and improving welding quality.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0025] Figure 1 It is a principle structure block diagram of one embodiment of the welding machine equipment of the present invention;

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

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

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

[0029] Figure 5 A circuit diagram of a first photoelectric coupler of one embodiment of a synchronous wire feeding control device of the present invention;

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

[0031] Figure 7 A circuit diagram of a second photoelectric coupler of one embodiment of a synchronous wire feeding control device of the present invention;

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

[0033] Fig. 9 A circuit diagram of a driving module of a welding device according to one embodiment of the present invention.

[0034] Reference numerals:

[0035] Input connection module 100; connection end group 110; first rectifier unit 120; motor start and stop state sampling module 200; motor direction sampling module 300; first photoelectric coupler 310; second photoelectric coupler 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 feeding motor 600; auxiliary wire feeding motor 700; drive module 800. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] like Figure 1 - Fig. 9As shown, a synchronous wire feeding control device according to an embodiment of the first aspect of the present invention is applied to a welding machine device, the welding machine device 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 and stop state sampling module 200, a motor steering sampling module 300, a motor speed sampling module 400 and a signal processing module 500, the input connection module 100 is used to connect with the main wire feeding motor 600, the motor start and 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 and stop state of the main wire feeding motor 600, the motor steering sampling module 300 is connected to the input connection module 100 0 is connected to form a second sampling signal, the second sampling signal is used to characterize the result of sampling the steering 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, the third sampling signal is used to characterize the result of sampling the speed of the main wire feeding motor 600, the input end of the signal processing module is respectively connected to the motor start and stop state sampling module 200, the motor steering sampling module 300 and the motor speed sampling module 400 to form a control signal according to the first sampling signal, the second sampling signal and the third sampling signal, the control end 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] Among them, this design can be applied to a welding machine, the main wire feeding motor 600 drives the main wire winding wheel, the auxiliary wire feeding motor 700 drives the auxiliary wire winding wheel, the main wire winding wheel and the auxiliary wire winding wheel are arranged front and back in the wire feeding direction, and the welding machine equipment is also provided 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 to operate according to the user's control instructions, and the synchronous wire feeding control device of this design can be added to the welding machine equipment, connected to the main wire feeding motor 600 by using the input connection module 100, and then output a control signal to control the operation of the drive module 800.

[0042] The synchronous wire feeding control device of the present invention has an input connection module 100 connected to the main wire feeding motor 600 to obtain the operation status of the main wire feeding motor 600, wherein the motor start and stop state sampling module 200 samples the start and stop state of the main wire feeding motor 600 to form a first sampling signal, the motor steering sampling module 300 samples the steering state of the main wire feeding motor 600 to form a second sampling signal, and the motor speed sampling module 400 samples the speed of the main wire feeding motor 600 to form a third sampling signal. The signal processing module 500 forms a control signal according to the first sampling signal, the second sampling signal and the third sampling signal, and uses the control signal to control the operation of the driving module 800 of the auxiliary wire feeding motor 700, so that the start, steering and speed of the auxiliary wire feeding motor 700 are synchronized with the main wire feeding motor 600, and there is no need to change the original driving structure of the main wire feeding motor 600, and the structure is simpler. The design stably synchronizes the start, steering and speed of the main wire feeding motor 600 and the auxiliary wire feeding motor 700, ensures the stable supply of welding wire, and improves the welding quality.

[0043] In some embodiments of the present invention, 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 respectively connected to the two poles of the power supply end of the main wire feeding motor 600 to obtain the first driving current. The connection terminal group 110 is respectively connected to the motor steering sampling module 300 and the input end of the first rectifier unit 120. The output end of the first rectifier unit 120 is respectively connected to the motor start and stop state sampling module 200 and the motor speed sampling module 400.

[0044] The connecting end group 110 can be a conventional connector, the main wire feeding motor 600 can be a DC motor, the connector can be connected to the positive and negative poles of the power supply end of the main wire feeding motor 600, and the connector can have two ports respectively connected to the motor start and stop state sampling module 200, the motor steering sampling module 300 and the motor speed sampling module 400, that is, Figure 2 The FM+ port and the FM- port are connected to the positive pole of the power supply end of the main wire feeding motor 600, and the FM- port is connected to the negative pole of the power supply end of the main wire feeding motor 600.

[0045] When the first driving current passes through the main wire feeding motor 600, it can indicate that the main wire feeding motor 600 is started, the direction of flow 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 rotation speed of the main wire feeding motor 600.

[0046] The motor direction sampling module 300 is connected to the connection end group 110 to detect the direction of the main wire feeding motor 600, and 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 state sampling module 200 and the motor speed sampling module 400 determine whether the main wire feeding motor 600 is started and the speed according to the presence and size 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 tube Q9, a semiconductor switch tube Q10, a capacitor C17, a resistor R47, a resistor R49 and a resistor R51. The controlled end of the switch tube Q9 is connected to the output end of the first rectifier unit 120, and the output end of the switch tube Q9 is respectively connected to the head end of the capacitor C17, the head end of the resistor R51 and the head end of the resistor R49. The tail end of the resistor R49 is respectively connected to the controlled end of the switch tube Q10, and the head end of the resistor R47 is respectively connected to the input end of the switch tube Q10 and the signal processing module 500. The input end of the switch tube Q9 and the tail end of the resistor R47 are both connected to the power supply, and the tail end of the resistor R51, the tail end of the capacitor C17 and the output end of the switch tube Q10 are all grounded.

[0048] Resistor R51 and capacitor C17 form a delay circuit. Generally speaking, the driving circuit board of the main wire feeding motor 600 is composed of a semiconductor switch tube. The control circuit board outputs a PWM signal to control the on and off of the switch tube, thereby driving the main wire feeding motor 600. Therefore, the first driving current of the main wire feeding motor 600 still has an AC part after being rectified by the first rectifier unit 120. Therefore, the motor start-stop state sampling module 200 is provided with a delay circuit. The switch tube Q9 and the switch tube Q10 are n-type triodes or MOS tubes. When the main wire feeding motor 600 is started, the first driving current forms a high level to drive the switch tube Q9 to turn on, the capacitor C17 is quickly fully charged, and the switch tube Q10 is turned on. In the part where the duty cycle of the first driving current is at a low level, the capacitor C17 is slowly discharged through the resistor R51, the switch tube Q10 still remains turned on, and the first sampling signal is output to the signal processing module 500 at the terminal of the input end of the switch tube Q10.

[0049] In some embodiments of the present invention, 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 rectifier unit 440 and a speed control unit 450. The input end of the first generation unit 420 is connected to the output end of the first rectifier unit 120 to form a first comparison voltage according to the first drive current. The input end of the second rectifier unit 440 is respectively connected to the two poles of the power supply end of the auxiliary wire feeding motor 700 to obtain the second drive current. The input end of the second generation unit 430 is connected to the output end of the second rectifier unit 440 to form a second comparison voltage according to the second drive current. The first input end of the comparison unit 410 is connected to the output end of the first generation unit 420, the second input end of the comparison unit 410 is connected to the output end of the second generation unit 430, the output end 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 according to the comparison result of the comparison unit 410, and the speed control unit 450 is connected to the signal processing module 500.

[0050] The first generating unit 420 forms a first comparison voltage for the first driving current, and the input end of the second rectifying unit 440 can be connected to the positive and negative poles of the power supply end of the auxiliary wire feeding motor 700, so that the second driving current can be obtained when the auxiliary wire feeding motor 700 is running. The second generating unit 430 forms a second comparison voltage for the second driving current, and compares the magnitudes of the first comparison voltage and the second comparison voltage through the comparison unit 410. When the first comparison voltage is greater than the second comparison voltage or the first comparison voltage is 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 generating unit 420 includes a resistor R37, a resistor R39 and a capacitor C10, the comparing unit 410 includes a comparator U7B, a capacitor C12 and a resistor R41, the second generating unit 430 includes a resistor R42, a resistor R43, an adjustable resistor RW1 and a capacitor C14, the head end of the resistor R37 is connected to the output end of the first rectifying unit 120, the tail end of the resistor R37 is respectively connected to the head end of the resistor R39, the head end of the capacitor C10 and the first input end of the comparator U7B, the head end of the adjustable resistor RW1 is connected to the second rectifying unit 4 The output end of the comparator U7B is connected to the output end of 40, the adjustment end of the adjustable resistor RW1 is connected to the head end of the resistor R43, the tail end of the resistor R43 is respectively connected to the head end of the capacitor C14 and the head end of the resistor R42, the tail end of the resistor R42 is respectively connected to the head end of the capacitor C12 and the second input end of the comparator U7B, the tail end of the capacitor C12 is connected to the head end of the resistor R41, the output end of the comparator U7B is respectively connected to the tail end of the resistor R41 and the speed control unit 450, the tail end of the resistor R39, the tail end of the capacitor C10, the tail end of the capacitor C14 and the tail end of the adjustable resistor RW1 are all grounded.

[0052] The user can adjust the resistance value of the adjustable resistor RW1 according to the deviation of the main wire feeding motor 600 and the auxiliary wire feeding motor 700 and the requirements of the resistance and capacitance 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 forms a PWM speed control signal as the third sampling signal according to the comparison result.

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

[0054] The light emitter of the first photocoupler 310 and the light emitter of the second photocoupler 320 are respectively connected to the two poles of the power supply end of the main wire feeding motor 600. When the first driving current flows from the first pole to the second pole, the light emitter of the first photocoupler 310 is turned on and the light emitter of the second photocoupler 320 is turned off. When the first driving current flows from the second pole to the first pole, the light emitter of the first photocoupler 310 is turned off and the light emitter of the second photocoupler 320 is turned on. The signal processing module 500 is respectively connected to the light receiver of the first photocoupler 310 and the light receiver of the second photocoupler 320 to obtain a second sampling signal.

[0055] Specifically, the driving module 800 of the auxiliary wire feeding motor 700 may include a semiconductor switch tube Q1, a semiconductor switch tube Q2, a semiconductor switch tube Q5 and a semiconductor switch tube Q6. The input end of the switch tube Q1 and the input end of the switch tube Q2 are both connected to the power supply, the output end of the switch tube Q1 is respectively connected to the first pole of the power supply end of the auxiliary wire feeding motor 700 and the input end of the switch tube Q5, the output end of the switch tube Q2 is respectively connected to the second pole of the power supply end of the auxiliary wire feeding motor 700 and the input end of the switch tube Q6, and the output end of the switch tube Q5 and the output end of the switch tube 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 light receiver of the first photoelectric coupler 310, the motor start-stop state sampling module 200 and the speed control unit 450 respectively. The first signal processing unit 510 is used to process the first sampling signal, the second sampling signal and the third sampling signal and output a first PWM signal at the first control end and a second PWM signal at the second control end. The second signal processing unit 520 is connected to the light receiver of the second photoelectric coupler 320, the motor start-stop state sampling module 200 and the speed control unit 450 respectively. and connected to the speed control unit 450, the second signal processing unit 520 is used to process the first sampling signal, the second sampling signal and the third sampling signal and output a third PWM signal at the third control end and a fourth PWM signal at the fourth control end, the first control end of the first signal processing unit 510 is connected to the controlled end of the switch tube Q1, the second control end of the first signal processing unit 510 is connected to the controlled end of the switch tube Q5, the third control end of the second signal processing unit 520 is connected to the controlled end of the switch tube Q2, and the fourth control end of the second signal processing unit 520 is connected to the controlled end of the switch tube Q6.

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

[0058] When the main wire feeding motor 600 is started and the first drive current flows from the first pole to the second pole of the main wire feeding motor 600, the switch tube Q1 and the switch tube Q6 are turned on and off to form a second drive current that also flows from the first pole to the second pole of the auxiliary wire feeding motor 700, and a first PWM signal and a fourth PWM signal that match each other are formed according to the speed regulation signal to control the on and off frequencies of the switch tube Q1 and the switch tube Q6 respectively, thereby adjusting the rotation speed of the auxiliary wire feeding motor 700, while the switch tube Q2 and the switch tube Q5 remain disconnected.

[0059] Similarly, when the main wire feeding motor 600 is started and the first drive current flows from the second pole to the first pole of the main wire feeding motor 600, the switch tube Q2 and the switch tube Q5 are turned on and off, forming a second drive current that also flows from the second pole to the first pole of the auxiliary wire feeding motor 700, and a second PWM signal and a third PWM signal that match each other are formed according to the speed regulation signal, which respectively control the on and off frequencies of the switch tube Q2 and the switch tube Q5, thereby adjusting the speed of the auxiliary wire feeding motor 700, while the switch tube Q1 and the switch tube Q6 remain disconnected.

[0060] In some embodiments of the present invention, 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 tube Q3 and a semiconductor switch tube Q4. The first input end of the first NAND gate 511 is connected to the speed control unit 450 to obtain the third sampling signal, the second input end of the first NAND gate 511 is connected to the light receiver of the first photocoupler 310 to obtain the second sampling signal, and the output end of the first NAND gate 511 is respectively connected to the input end of the first NOT gate 512, the first input end of the first AND gate 513 and the first end of the resistor R13. The tail end of the resistor R13 is respectively connected to the head end of the capacitor C5 and the second input end of the first AND gate 513, the output end of the first NOT gate 512 is respectively connected to the input end of the switch tube Q3 and the controlled end of the switch tube Q1, the controlled end of the switch tube Q3 is connected to the motor start-stop state sampling module 200 to obtain the first sampling signal, the output end of the first AND gate 513 is respectively connected to the input end of the switch tube Q4 and the controlled end of the switch tube Q5, the controlled end of the switch tube Q4 is connected to the motor start-stop state sampling module 200 to obtain the first sampling signal, and the output end of the switch tube Q3, the output end of the switch tube Q4 and the tail end of the 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 tube Q7, and a semiconductor switch tube Q8. The first input end of the second NAND gate 521 is connected to the speed control unit 450 to obtain the third sampling signal. The second input end of the second NAND gate 521 is connected to the light receiver of the second photoelectric coupler 320 to obtain the second sampling signal. The output end of the second NAND gate 521 is respectively connected to the input end of the second NOT gate 522, the first input end of the second AND gate 523, and the first end of the resistor R36. The resistor R The tail end of 36 is respectively connected to the head end of capacitor C9 and the second input end of the second AND gate 523, the output end of the second NOT gate 522 is respectively connected to the input end of the switch tube Q7 and the controlled end of the switch tube Q2, the controlled end of the switch tube 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 respectively connected to the input end of the switch tube Q8 and the controlled end of the switch tube Q6, the controlled end of the switch tube Q8 is connected to the motor start-stop state sampling module 200 to obtain the first sampling signal, and the output end of the switch tube Q6, the output end of the switch tube Q8 and the tail end of the capacitor C9 are all grounded.

[0062] Taking the case where the main wire feeding motor 600 is started and the first drive current flows 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 started, the terminal voltage at the input end of the switch tube Q10 is always at a low level, the switch tubes Q3, Q4, Q7 and Q8 can be n-type transistors or MOS tubes, and the switch tubes Q3, Q4, Q7 and Q8 remain turned off. When the main wire feeding motor 600 is disconnected, the switch tubes Q3, Q4, Q7 and Q8 remain turned on, the switch tubes Q1, Q2, Q5 and Q6 can be n-type transistors or MOS tubes, and all remain turned off, and no second drive current passes through the auxiliary wire feeding motor 700.

[0063] In the first signal processing unit 510, the second input end of the first NAND gate 511 is always a high-level input, and the speed control unit 450 outputs a speed control signal that is a PWM signal. When the first input end of the first NAND gate 511 is also a high-level input, the first NAND gate 511 outputs a low level. In all other cases, the first NAND gate 511 outputs a low level, then the first NOT gate 512 outputs a high level, and the first AND gate 513 outputs a low level. Driven by the speed control signal, the first input end of the first NAND gate 511 is briefly switched to a low-level input, and the first NAND gate 511 briefly outputs a high level. Due to the delay effect of the resistor R13 and the capacitor C5, the first AND gate 513 outputs a low level and maintains the output low level.

[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] However, when the main wire feeding motor 600 is started and the first driving current flows from the second pole to the first pole of the main wire feeding motor 600, the situation is the opposite, which will not be described in detail here.

[0066] According to the control method of the second aspect of the present invention, it is applied to the synchronous wire feeding control device disclosed in any of the above embodiments, and the control method includes: the motor start and stop state sampling module 200 forms a first sampling signal for characterizing the result of sampling the start and stop states of the main wire feeding motor 600; the motor steering sampling module 300 forms a second sampling signal for characterizing the result of sampling the steering state of the main wire feeding motor 600; the motor speed sampling module 400 forms a third sampling signal for characterizing the result of sampling the speed of the main wire feeding motor 600; the signal processing module 500 forms a control signal according to the first sampling signal, the second sampling signal and the third sampling signal, and the control end 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 a control signal to control the operation of the driving module 800, stabilize the start, direction and speed of the synchronous main wire feeding motor 600 and the auxiliary wire feeding motor 700, ensure the stable supply of welding wire, and improve the welding quality.

[0068] According to the welding machine equipment of the third aspect embodiment of the present invention, it includes a main wire feeding motor 600, an auxiliary wire feeding motor 700 and a synchronous wire feeding control device disclosed in any of the above embodiments, the synchronous wire feeding control device is connected to the main wire feeding motor 600 to obtain a first sampling signal, a second sampling signal and a third sampling signal and form a control signal, and the synchronous wire feeding control device is connected to a driving module 800 of the auxiliary wire feeding motor 700 to output a control signal to control the operation of the driving 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 driving of the auxiliary wire feeding motor. There is no need to change the original driving structure of the main wire feeding motor. The structure is simpler and can stably and synchronously control the starting, steering and speed of the main wire feeding motor and the auxiliary wire feeding motor, thereby ensuring a stable supply of welding wire and improving welding quality.

[0070] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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 the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A synchronous wire feeding control device, applied to a welding machine, wherein the welding machine comprises a main wire feeding motor and an auxiliary wire feeding motor, characterized in that: The synchronous wire feeding control device comprises: An input connection module, used 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, wherein the first sampling signal is used to represent the result of sampling the start / stop state of the main wire feeding motor; A motor steering sampling module connected to the input connection module to form a second sampling signal, wherein the second sampling signal is used to represent the result of sampling the steering state of the main wire feeding motor; A motor speed sampling module, connected to the input connection module to form a third sampling signal, wherein the third sampling signal is used to represent the result of sampling the speed of the main wire feeding motor; A signal processing module, wherein the input end of the signal processing module is 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 according to the first sampling signal, the second sampling signal and the third sampling signal, and the control end of the signal processing module is connected to the driving module of the auxiliary wire feeding motor to output a control signal to control the operation of the driving module.

2. A synchronous wire feeding control device according to claim 1, characterized in that: The input connection module includes a connection end group and a first rectifier unit. The connection end group is respectively connected to the two poles of the power supply end of the main wire feeding motor to obtain a first driving current. The connection end group is respectively connected to the motor steering sampling module and the input end of the first rectifier unit. The output end of the first rectifier unit is respectively connected to the motor start and stop state sampling module and the motor speed sampling module.

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

4. A synchronous wire feeding control device according to claim 2, characterized in that: The motor speed sampling module includes a comparison unit, a first generation unit, a second generation unit, a second rectifier unit and a speed control unit. The input end of the first generation unit is connected to the output end of the first rectifier unit to form a first comparison voltage according to the first drive current. The input end of the second rectifier unit is respectively connected to the two poles of the power supply end of the auxiliary wire feeding motor to obtain the second drive current. The input end of the second generation unit is connected to the output end of the second rectifier unit to form a second comparison voltage according to the second drive current. The first input end of the comparison unit is connected to the output end of the first generation unit, the second input end of the comparison unit is connected to the output end of the second generation unit, and the output end of the comparison unit is connected to the speed control unit. The speed control unit forms a speed control signal as a third sampling signal according to the comparison result of the comparison unit, and the speed control unit is connected to the signal processing module.

5. A synchronous wire feeding control device according to claim 4, characterized in that: The first generating unit includes a resistor R37, a resistor R39 and a capacitor C10, the comparing unit includes a comparator U7B, a capacitor C12 and a resistor R41, the second generating unit includes a resistor R42, a resistor R43, an adjustable resistor RW1 and a capacitor C14, the head end of the resistor R37 is connected to the output end of the first rectifying unit, the tail end of the resistor R37 is respectively connected to the head end of the resistor R39, the head end of the capacitor C10 and the first input end of the comparator U7B, the head end of the adjustable resistor RW1 is connected to the output end of the second rectifying unit, and the tail end of the resistor R37 is respectively connected to the head end of the resistor R39, the head end of the capacitor C10 and the first input end of the comparator U7B, the head end of the adjustable resistor RW1 is connected to the output end of the second rectifying unit, and the adjustable resistor RW1 is connected to the output end of the second rectifying unit. The adjusting end of the resistor RW1 is connected to the head end of the resistor R43, the tail end of the resistor R43 is respectively connected to the head end of the capacitor C14 and the head end of the resistor R42, the tail end of the resistor R42 is respectively connected to the head end of the capacitor C12 and the second input end of the comparator U7B, the tail end of the capacitor C12 is connected to the head end of the resistor R41, the output end of the comparator U7B is respectively connected to the tail end of the resistor R41 and the speed control unit, the tail end of the resistor R39, the tail end of the capacitor C10, the tail end of the capacitor C14 and the tail end of the adjustable resistor RW1 are all grounded.

6. A synchronous wire feeding control device according to claim 4, characterized in that: The motor steering sampling module includes a first photoelectric coupler and a second photoelectric coupler, the positive pole of the light emitter of the first photoelectric coupler is connected to the first pole of the power supply end of the main wire feeding motor, the negative pole of the light emitter of the first photoelectric coupler is connected to the second pole of the power supply end of the main wire feeding motor, the light receiver of the first photoelectric coupler is connected to the signal processing module, the positive pole of the light emitter of the second photoelectric coupler is connected to the second pole of the power supply end of the main wire feeding motor, the negative pole of the light emitter of the second photoelectric coupler is connected to the first pole of the power supply end of the main wire feeding motor, and the light receiver of the second photoelectric coupler is connected to the signal processing module.

7. A synchronous wire feeding control device according to claim 6, characterized in that: The driving module includes a semiconductor switch tube Q1, a semiconductor switch tube Q2, a semiconductor switch tube Q5 and a semiconductor switch tube Q6, the input end of the switch tube Q1 and the input end of the switch tube Q2 are both connected to the power supply, the output end of the switch tube Q1 is respectively connected to the first pole of the auxiliary wire feeding motor power supply end and the input end of the switch tube Q5, the output end of the switch tube Q2 is respectively connected to the second pole of the auxiliary wire feeding motor power supply end and the input end of the switch tube Q6, and the output end of the switch tube Q5 and the output end of the switch tube 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 respectively connected to the light receiver of the first photoelectric coupler, the motor start-stop state sampling module and the speed control unit, the first signal processing unit is used to convert the first sampling signal The first signal processing unit processes the first sampling signal, the second sampling signal and the third sampling signal and outputs the first PWM signal at the first control end and the second PWM signal at the second control end. The second signal processing unit is respectively connected to the light receiver of the second photoelectric coupler, the motor start-stop state sampling module and the speed control unit. The second signal processing unit is used to process the first sampling signal, the second sampling signal and the third sampling signal and output the third PWM signal at the third control end and the fourth PWM signal at the fourth control end. The first control end of the first signal processing unit is connected to the controlled end of the switch tube Q1, the second control end of the first signal processing unit is connected to the controlled end of the switch tube Q5, the third control end of the second signal processing unit is connected to the controlled end of the switch tube Q2, and the fourth control end of the second signal processing unit is connected to the controlled end of the switch tube Q6.

8. A synchronous wire feeding control device according to claim 7, 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 tube Q3 and a semiconductor switch tube Q4, a first input end of the first NAND gate is connected to the speed control unit to obtain a third sampling signal, a second input end of the first NAND gate is connected to the light receiver of the first photoelectric coupler to obtain a second sampling signal, an output end of the first NAND gate is respectively connected to the input end of the first NOT gate, the first input end of the first AND gate and the head end of the resistor R13, and the tail end of the resistor R13 is respectively connected to the input end of the first NOT gate, the first input end of the first AND gate and the head end of the resistor R13. The first AND gate is connected to the first end of the 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 the switch tube Q3 and the controlled end of the switch tube Q1, respectively; the controlled end of the switch tube Q3 is connected to the motor start-stop state sampling module to obtain a first sampling signal; the output end of the first AND gate is connected to the input end of the switch tube Q4 and the controlled end of the switch tube Q5, respectively; the controlled end of the switch tube Q4 is connected to the motor start-stop state sampling module to obtain a first sampling signal; the output end of the switch tube Q3, the output end of the switch tube Q4 and the tail end of the 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 tube Q7 and a semiconductor switch tube Q8, the first input end of the second NAND gate is connected to the speed control unit to obtain a third sampling signal, the second input end of the second NAND gate is connected to the light receiver of the second photoelectric coupler to obtain a second sampling signal, the output end of the second NAND gate is respectively connected to the input end of the second NOT gate, the first input end of the second AND gate and the head end of the resistor R36, the tail end of the resistor R36 is respectively connected to the input end of the second NOT gate, the first input end of the second AND gate and the head end of the resistor R36. The first end of the capacitor C9 and the second input end of the second AND gate are connected, the output end of the second NOT gate is respectively connected to the input end of the switch tube Q7 and the controlled end of the switch tube Q2, the controlled end of the switch tube Q7 is connected to the motor start-stop state sampling module to obtain a first sampling signal, the output end of the second AND gate is respectively connected to the input end of the switch tube Q8 and the controlled end of the switch tube Q6, the controlled end of the switch tube Q8 is connected to the motor start-stop state sampling module to obtain a first sampling signal, and the output end of the switch tube Q6, the output end of the switch tube Q8 and the tail end of the capacitor C9 are all grounded.

9. A control method, characterized in that: Applied to the synchronous wire feeding control device according to any one of claims 1 to 8, the control method comprises: The motor start / stop state sampling module generates a first sampling signal for representing the result of sampling the start / stop state of the main wire feeding motor; The motor steering sampling module forms a second sampling signal for representing the result of sampling the steering state of the main wire feeding motor; The motor speed sampling module forms a third sampling signal for representing the result of sampling the speed of the main wire feeding motor; The signal processing module forms a control signal according to the first sampling signal, the second sampling signal and the third sampling signal. The control end of the signal processing module is connected to the driving module of the auxiliary wire feeding motor to output the control signal to control the operation of the driving module.

10. 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 to 8, wherein 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 form a control signal, and the synchronous wire feeding control device is connected to a driving module of the auxiliary wire feeding motor to output a control signal to control the operation of the driving module.

Images