Electric welding machine

Abstract

The utility model provides an electric welding machine which comprises a shell, a machine core module, an electrode holder clamp and a grounding clamp, the shell comprises a first shell and a second shell which define a containing cavity, and the machine core module is located in the containing cavity and fixedly installed on the second shell; the electrode holder clamp and the grounding clamp are fixedly connected with the machine core module and extend out of the containing cavity. The first shell comprises at least one first clamping piece and at least one second clamping piece, the second shell comprises at least one third clamping piece and at least one fourth clamping piece, and the first clamping piece and the third clamping piece are oppositely arranged and connected with each other; the second clamping piece and the fourth clamping piece are oppositely arranged and connected with each other, and the two side faces of the first shell are connected with the two side faces of the second shell in a clamped mode respectively. The size of the electric welding machine is reduced while the reliability of an electric welding machine product is kept, and the application range of the electric welding machine is widened.

Description

Technical Field

[0001] The present application relates to the technical field of welding equipment, and in particular to an electric welding machine. Background Art

[0002] The overall environment of the welding machine industry is becoming more and more demanding in terms of cost control. The use of welding machines is becoming more and more extensive, and more and more of them are used in homes, but the frequency of use is not high. At this time, small-sized, low-cost electric welding machines are increasingly accepted by end consumers. In this context, it is necessary to develop lower-cost and more compact electric welding machines while ensuring reliable product quality and no functional degradation, so that electric welding machines are more suitable for widespread promotion and application. Utility Model Content

[0003] In view of the problems in the prior art, the purpose of the present application is to provide an electric welding machine, which is conducive to reducing the size of the electric welding machine while maintaining the reliability of the electric welding machine product and expanding the application scope of the electric welding machine.

[0004] The embodiment of the present application provides an electric welding machine, including a housing, a core module, a welding clamp and a grounding clamp, wherein the housing includes a first housing and a second housing that enclose a receiving cavity, the core module is located inside the receiving cavity and is fixedly mounted on the second housing, and the welding clamp and the grounding clamp are fixedly connected to the core module and extend out of the receiving cavity;

[0005] The first shell includes at least one first clip and at least one second clip, the second shell includes at least one third clip and at least one fourth clip, the first clip and the third clip are arranged opposite to each other and are connected to each other, the second clip and the fourth clip are arranged opposite to each other and are connected to each other, and the two side surfaces of the first shell are respectively clipped to the two side surfaces of the second shell.

[0006] In some embodiments, the inner wall of the second shell is provided with at least one movement positioning column, and the movement module is installed on the second shell through the movement positioning column.

[0007] In some embodiments, the movement module includes a circuit board, the circuit board includes at least one positioning hole, and the movement positioning column is inserted into the positioning hole of the circuit board.

[0008] In some embodiments, the movement module includes a plurality of heat sinks, and at least one reinforcing rib is disposed inside the first shell, and a surface of the reinforcing rib is relatively fitted with a top of the heat sink.

[0009] In some embodiments, the first clip connector is an insert-type clip, at least one of the insert-type clips is provided on each of the two side surfaces of the first shell, the second clip connector is a cylindrical clip, the third clip connector is a first clip groove adapted to the shape of the insert-type clip, and the fourth clip connector is a second clip groove adapted to the shape of the cylindrical clip.

[0010] In some embodiments, a fan is also included, an air inlet is provided on the side of the shell close to the fan, an air outlet is provided on the side of the shell opposite to the air inlet, and the movement module includes multiple radiators, which are arranged between the air inlet and the air outlet.

[0011] In some embodiments, the first shell is provided with a first fan slot, the second shell is provided with a second fan slot, the first fan slot and the second fan slot enclose a fan installation cavity, and the fan is installed inside the fan installation cavity.

[0012] In some embodiments, a plug structure is further included, and the plug structure is fixedly mounted on the first shell and the second shell through a fastening structure, and the installation direction of the fastening structure is perpendicular to the working horizontal plane of the electric welder.

[0013] In some embodiments, the fastening structure includes a screw, and the screw is penetrated through the second shell, the plug structure and the first shell in a direction perpendicular to the working horizontal plane.

[0014] In some embodiments, the welding clamp and the grounding clamp are respectively fixedly connected to the core module via an OT terminal.

[0015] In some embodiments, the movement module includes a control component, the control component includes a transformer circuit, the transformer circuit includes a heat sink, an insulated gate bipolar transistor and a bridge stack, and the insulated gate bipolar transistor and the bridge stack are arranged on the outside of the same heat sink.

[0016] In some embodiments, the heat sink includes a heat dissipation portion and a mounting portion, and the insulated gate bipolar transistor and the bridge stack are respectively disposed on two opposite sides of the mounting portion.

[0017] The electric welding machine provided in this application has the following advantages:

[0018] The present application provides a modular assembly electric welding machine, in which the shell consists of two parts, and the first shell and the second shell are fixedly connected by a bilateral clamping method, without the need to use too many screws to connect, thereby avoiding the screws occupying too much internal space of the shell, and can effectively ensure a stable and reliable connection between the first shell and the second shell, which is beneficial to reducing the size of the electric welding machine while maintaining the reliability of the electric welding machine product, and expanding the application scope of the electric welding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings.

[0020] Figure 1 It is a structural schematic diagram of an electric welding machine according to an embodiment of the present application;

[0021] Figure 2 is an exploded view of an electric welding machine according to an embodiment of the present application;

[0022] Figure 3 This is a schematic diagram of a second housing after a movement assembly is installed in an embodiment of the present application;

[0023] Figure 4 is a schematic diagram of a second housing after a fan is installed in an embodiment of the present application;

[0024] Figure 5 This is a schematic diagram of a second housing after a plug is installed in an embodiment of the present application;

[0025] Figure 6 is a schematic diagram of a first housing separated from other components in an embodiment of the present application;

[0026] Figure 7 is a structural schematic diagram of a first shell according to an embodiment of the present application;

[0027] Figure 8 is a top view of the second housing and various components after being assembled in one embodiment of the present application;

[0028] Fig. 9 is a schematic diagram of an air inlet on a first housing according to an embodiment of the present application;

[0029] Fig.10 is a schematic diagram of an air outlet on a first shell according to an embodiment of the present application;

[0030] Fig.11 It is a schematic diagram of the cooperation between a heat sink and an insulated gate bipolar transistor according to an embodiment of the present application;

[0031] Fig.12 is a structural block diagram of a control component of an electric welding machine according to an embodiment of the present application;

[0032] Fig.13 is a schematic diagram of a voltage sampling circuit according to an embodiment of the present application;

[0033] Fig.14 is a schematic diagram of a current sampling circuit according to an embodiment of the present application;

[0034] Fig.15is a schematic diagram of an MCU circuit of an embodiment of the present application;

[0035] Fig.16 is a schematic diagram of a PWM control circuit according to an embodiment of the present application.

[0036] Reference numerals:

[0037] 1 First housing 6 Fan

[0038] 101 first buckle 7 plug structure

[0039] 102 Second buckle 701 pin

[0040] 103 first plug positioning column 702 mounting groove

[0041] 104 First fan slot 8 Second housing

[0042] 105 First screw column 801 Movement positioning column

[0043] 106 reinforcement rib 802 second plug positioning column

[0044] 2 Grounding clip 803 Second fan slot

[0045] 3 Movement module 804 first card slot

[0046] 301 circuit board 805 second card slot

[0047] 302 Radiator 806 Second screw column

[0048] 303 IGBT 9 Screw

[0049] 3031 Fixing screw 10 Air inlet

[0050] 304 Bridge 11 Air outlet

[0051] 4 welding clamps 15 OT terminals

[0052] 5 Knobs DETAILED DESCRIPTION

[0053] The example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as being limited to the embodiments set forth herein; on the contrary, these embodiments are provided so that the present application will be comprehensive and complete, and the concept of the example embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated descriptions will be omitted. "Or" and "or" in the specification may both mean "and" or "or". Although the terms "upper", "lower", "between", etc. may be used in this specification to describe different exemplary features and elements of the present application, these terms are used herein only for convenience, such as according to the directions of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional direction of the structure to fall within the scope of the present application. Although "first" or "second" etc. are used in this specification to represent certain features, they are only used to represent the function, and are not used as a limitation on the number and importance of specific features.

[0054] Figures 1 to 11 The structure of an electric welding machine according to an embodiment of the present application is shown. Figure 1 and Figure 2 As shown, the present application provides an electric welding machine, including a shell, a core module 3, a welding clamp 4 and a grounding clamp 2. The shell is, for example, a plastic shell, including a first shell 1 and a second shell 8 that enclose a housing cavity. The core module 3 is located inside the housing cavity and is fixedly installed on the second shell 8. The welding clamp 4 and the grounding clamp 2 are fixedly connected to the core module 3 and extend out of the housing cavity. In this embodiment, the first shell 1 is an upper shell, and the second shell 8 is a lower shell, but the present application is not limited to this. In other embodiments, the positions of the first shell 1 and the second shell 8 can also be interchanged. The first shell 1 includes a top surface, a front end surface, a rear end surface and two side surfaces on both sides, and the second shell 8 includes a bottom surface, a front end surface, a rear end surface and two side surfaces on both sides. The electric welding machine also includes a knob 5 used in conjunction with a potentiometer. The potentiometer controls the output control amount according to the position of the knob 5 to achieve adjustable output current.

[0055] The first shell 1 includes at least one first clamping member and at least one second clamping member, the second shell 8 includes at least one third clamping member and at least one fourth clamping member, the first clamping member and the third clamping member are arranged opposite to each other and connected to each other, the second clamping member and the fourth clamping member are arranged opposite to each other and connected to each other, and the two side surfaces of the first shell 1 are respectively clamped with the two side surfaces of the second shell 8, that is, the two side surfaces of the first shell 1 are respectively clamped with the corresponding clamping members of the second shell 8 through at least one clamping member. Therefore, the first shell 1 and the second shell 8 are fixedly connected by bilateral clamping, without the need to use too many screws to connect, so as to avoid the screws occupying too much space inside the shell, and can effectively ensure the stable and reliable connection between the first shell 1 and the second shell 8, which is conducive to reducing the volume of the electric welder while maintaining the reliability of the electric welder product and broadening the application range of the electric welder.

[0056] like Figure 2 and Figure 3 As shown, in this embodiment, the inner wall of the second shell 8 is provided with at least one movement positioning column 801, and the movement module 3 is installed in the second shell 8 through the movement positioning column 801. Specifically, the movement module 3 includes a circuit board 301, a control component and a radiator 302 arranged above the circuit board 301, the control component realizes the control function of the electric welding machine, and the radiator 302 dissipates heat for the movement module 3. The circuit board 301 includes at least one positioning hole, and the movement positioning column 801 is penetrated in the positioning hole of the circuit board 301. Through the structure of the movement positioning column 801 and the positioning hole of the circuit board 301, the movement module 3 can be stably installed in the correct position of the second shell 8.

[0057] like Figure 2 and Figure 5 As shown, the electric welder further comprises a plug structure 7, the plug structure 7 comprises a body and pins 701 for electrically connecting to an external power source, the pins 701 are exposed outside the housing. The plug structure 7 is fixedly mounted on the first housing 1 and the second housing 8 by a fastening structure, and the mounting direction of the fastening structure is perpendicular to the working horizontal plane of the electric welder. Figure 4 , Figure 5 and Figure 7As shown, the fastening structure includes a first plug positioning column 103 and a first screw column 105 arranged on the first shell 1, a second plug positioning column 802 and a second screw column 806 arranged on the second shell 8, a mounting groove 702 and a screw hole (not shown in the figure) arranged on the plug structure 7, and a screw 9. The working horizontal plane of the electric welder is a plane parallel to the upper surface or the lower surface of the electric welder. The plug structure 7 is installed on the shell in a vertical direction perpendicular to the working horizontal plane of the electric welder. The first plug positioning column 103 and the second plug positioning column 802 are respectively inserted into the mounting groove 702. The screw 9 is penetrated through the second screw column 806 of the second shell 8, the screw hole of the plug structure 7 and the first screw column 105 of the first shell 1 in a direction perpendicular to the working horizontal plane, and while fixing the plug structure 7 and the shell, it also further fixes the first shell 1 and the second shell 8. Therefore, this embodiment achieves the effect of fixing the first shell 1, the second shell 8 and the plug structure 7 together by only one screw 9, which can also ensure the assembly stability of the electric welding machine and avoid the potential risk of snap-on failure between the first shell 1 and the second shell 8, without the need to set multiple screws that occupy the internal space of the shell as in the prior art.

[0058] In this embodiment, the first plug positioning column 103 and the second plug positioning column are respectively columnar with a quadrilateral cross section, and the cross section of the installation groove 702 of the plug structure 7 is also a quadrilateral, which can provide guidance for the installation of the plug structure 7, and the quadrilateral structure prevents the plug structure 7 from rotating and deflecting, improves the installation stability of the plug structure 7, and can also play a guiding and limiting role for the alignment between the first shell 1 and the second shell 8. By providing the matching of the installation groove 702 and the positioning column and the installation structure of a screw 9, even if the plug structure 7 is repeatedly plugged in and out during the use of the electric welding machine, the stable and reliable connection between the plug structure 7 and the shell can be maintained. The screw column 105 of the first shell 1 is arranged in the vertical direction, not at the edge position, and will not occupy the space inside the electric welding machine. Since the overall electric welding machine adopts a detachable connection design of the first shell 1 and the second shell 8, the screw 9 can be designed at the foot pad position at the bottom, so that the screw 9 will not be exposed, and the appearance of the overall electric welding machine is more beautiful and is not affected by rain. Therefore, the connection design of one screw 9 in this embodiment ensures the structural reliability of the entire electric welding machine, and is conducive to making the internal structure of the electric welding machine more compact and the assembly simpler and more convenient.

[0059] In addition, the plug structure 7 in this embodiment is a separate assembly part, and the corresponding plug structure 7 can be replaced according to the plug and socket standards of different regions, so that the overall electric welding machine has higher versatility.

[0060] like Figure 3 , Figure 4, Figures 7-10 As shown, the electric welder further includes a fan 6, an air inlet 10 is provided on the side of the housing close to the fan 6, an air outlet 11 is provided on the side of the housing opposite to the air inlet 10, and the core module includes a plurality of radiators 302, and the radiators 302 are arranged between the air inlet 10 and the air outlet 11. Therefore, the electric welder dissipates heat through air cooling, and the heat of the core module is concentrated on the radiator 302 and cooled by air cooling. Figure 8 As shown, the fan 6 is arranged in front of the radiator 302, and the air inlet 10, the fan 6, the radiator 302 and the air outlet 11 are in the same straight line, so that the heat dissipation effect is the best. Fig. 9 and Fig.10 As shown, the shutters of the air inlet 10 and the air outlet 11 are not set at an angle and are parallel to the working horizontal plane, so that there will be no loss in the air inlet and air outlet of the fan 6. At the same time, there is no air outlet 11 on the side of the first housing 1, which can achieve the maximum functional utilization of the fan. Figure 4 and Figure 7 As shown, the first housing 1 is provided with a first fan slot 104, the second housing 8 is provided with a second fan slot 803, the first fan slot 104 and the second fan slot 803 enclose a fan installation cavity, and the fan 6 is installed inside the fan installation cavity. The first fan slot 104 and the second fan slot 803 both have a certain depth, and installing the fan 6 in the first fan slot 104 and the second fan slot 803 can maintain the stability of the fan 6, so that the fan 6 will not shake.

[0061] like Figure 7 As shown, at least one reinforcing rib 106 is provided inside the first housing 1, and the surface of the reinforcing rib 106 is relatively fitted with the top of the radiator 302. After the first housing 1 and the second housing 8 are assembled together, the reinforcing rib 106 presses the radiator 302, further improving the stability of the overall welding machine assembly.

[0062] like Figure 4 and Figure 7As shown, the first clip is a first clip 101, and the second clip is a second clip 102. In this embodiment, the first clip 101 is an insert-type clip, and at least one of the insert-type clips is provided on each of the two sides of the first shell 1, and the second clip 102 is a cylindrical clip. The third clip is a first slot 804 adapted to the shape of the insert-type clip, and the fourth clip is a second slot 805 adapted to the shape of the cylindrical clip. Therefore, the matching structure of the clip and the slot between the first shell 1 and the second shell 8 when inserted on both sides can ensure the assembly gap and assembly stability between the first shell 1 and the second shell 8. In addition, the matching of the cylindrical clip and the slot further improves the assembly reliability between the first shell 1 and the second shell 8, and the cylindrical clip has a certain guiding property, so that the first shell 1 and the second shell 8 are easier to align and assemble. The electric welding machine as a whole adopts a shell edge snap-on fixing method, which makes installation simpler and more convenient. No screws are used at the edges, which reduces the number of screw columns set in the first shell 1 and the second shell 8, avoiding the space inside the shell being occupied by screw columns with larger outer diameters, thereby facilitating the miniaturization of the overall electric welding machine.

[0063] like Figure 6 As shown, the welding clamp 4 and the grounding clamp 2 are fixedly connected to the core module 3 through an OT terminal 15 respectively. The welding clamp 4 and the grounding clamp 2 can be directly fixed to the rectifier radiator of the core module 3 through the OT terminal 15. The existing welding clamp 4 and the grounding clamp 2 generally adopt a split structure, and the length can be adjusted at will, but it also leads to an increase in the overall cost of the welding machine, and the volume of the welding machine becomes uncontrollable. In this embodiment, an integrated welding clamp 4 and a grounding clamp 2 with an OT terminal 15 are used, which can effectively control the cost and volume, and the overall internal space of the welding machine is more compact, with high space utilization, which is more conducive to the miniaturization of the welding machine.

[0064] like Figure 8 and Fig. 9As shown, in this embodiment, the control component includes a voltage conversion circuit, and the voltage conversion circuit includes a heat sink 302, an insulated gate bipolar transistor (IGBT) 303 and a bridge stack 304, and the insulated gate bipolar transistor 303 and the bridge stack 304 are arranged on the outside of the same heat sink 302. Specifically, the heat sink 302 includes a heat dissipation portion and a mounting portion, and the insulated gate bipolar transistor 303 and the bridge stack 304 are respectively arranged on two opposite sides of the mounting portion, and the insulated gate bipolar transistor 303 is fixed by fixing screws 3031. Therefore, the insulated gate bipolar transistor 303 and the bridge stack 304 are arranged back to back, which reduces the use of the heat sink. Compared with the structure in the prior art that the insulated gate bipolar transistor and the bridge stack are respectively arranged in two independent areas on the circuit board and are respectively connected to the heat sink, the volume of the overall core module is reduced, and at the same time, by adjusting the internal device layout, the heat dissipation requirements are taken into account, and the miniaturized structure of the electric welding machine is realized. Since the present application optimizes the air-cooling flow channel layout design, the heat dissipation capacity of the overall welding machine is further improved, which can meet the heat dissipation requirements of various components of the movement module.

[0065] When assembling the welding machine, Figure 3 As shown, firstly, the movement module 3 is installed on the movement positioning column 801 of the second housing 8, and then Figure 4 As shown, the fan 6 is installed on the second housing 8, and then Figure 5 As shown, the plug structure 7 is installed on the second housing 8, and then Figure 7 As shown, the welding clamp 4 and the grounding clamp 2 are fixed to the core module 3 through the OT terminal 15, and then the first shell 1 and the second shell 8 are aligned and buckled together, thus completing the assembly process of the electric welding machine. Figure 1 The electric welder shown. The present application modularizes the components, and the assembly is very convenient and quick. If a single component fails, the single component can be easily repaired or replaced separately without affecting the working state of other components. The connection and assembly relationship between the various components is very stable, which also improves the stability of the electric welder during use. The overall electric welder has a compact structure, and there are no excessive screws occupying the internal space of the shell, which is conducive to the miniaturization and lightness of the overall volume, and is conducive to expanding the application range of the electric welder.

[0066] In this embodiment, the control component is used to control the AC input signal of the external power supply and then output a driving DC signal to the welding clamp. Fig.12As shown, the control component includes a current sampling circuit, a voltage sampling circuit, a micro control unit circuit (MCU circuit), a given circuit, a PWM control circuit, a drive circuit and an output circuit. The current sampling circuit and the voltage sampling circuit respectively output a current sampling signal and a voltage sampling signal to the micro control unit. The given circuit outputs a given signal to the micro control unit. The micro control unit circuit generates a PWM control signal based on a proportional-integral algorithm according to the current sampling signal, the voltage sampling signal and the given signal and outputs it to the PWM control circuit. The output end of the PWM control circuit is connected to the output circuit through the drive circuit.

[0067] like Fig.12 As shown, the control component also includes an EMI (Electromagnetic Interference) circuit, an input rectifier filter circuit and a flyback switch power supply circuit. The output circuit includes an inverter circuit, a transformer circuit and an output rectifier circuit. The AC signal input from the external power supply passes through the EMI circuit and the input rectifier filter circuit to power the flyback switch power supply circuit. The output of the flyback switch power supply circuit powers the PWM (Pulse-Width Modulation) control circuit, the MCU (Microcontroller Unit) circuit and the given circuit. The current sampling circuit samples the current from the primary side of the transformer circuit, and the voltage sampling circuit samples the voltage from the output end of the output rectifier circuit. The current sampling signal and the voltage sampling signal are input into the MCU circuit, and the given circuit outputs the given signal to the MCU circuit. The MCU circuit uses a proportional integral algorithm to control the PWM control circuit, and finally outputs a DC signal to the welding clamp through the output rectifier circuit.

[0068] In this embodiment, the voltage sampling circuit is provided with a temperature protection switch. When the temperature protection switch is activated due to excessive temperature, the voltage sampling circuit outputs a level corresponding to the temperature protection state. When the micro control unit circuit detects the corresponding level of the temperature protection state, the set overheat protection action is executed. Therefore, the control component realizes overheat safety protection when the temperature is too high.

[0069] Fig.13 is a schematic diagram of a voltage sampling circuit according to an embodiment of the present application. Fig.14 is a schematic diagram of a current sampling circuit according to an embodiment of the present application. Fig.15 It is a schematic diagram of an MCU circuit according to an embodiment of the present application. Fig.16It is a schematic diagram of a PWM control circuit of an embodiment of the present application. In this embodiment, the MCU circuit includes an MCU chip U7, and the PWM control circuit includes a PWM control chip U2. After using the MCU circuit to replace the traditional control circuit implemented by an operational amplifier and a peripheral circuit, the internal software editing algorithm of the MCU chip U7 can be used to implement a different PI (proportional integral) regulation algorithm for each current segment, so that the output current regulation of the output rectifier circuit is more precise, the welding current is more stable, and welding spatter is reduced.

[0070] like Fig.13 , Fig.15 and Fig.16 As shown, the voltage sampling circuit includes a resistor R40, a resistor R39, a resistor R41, a resistor R46, a resistor R49, a resistor R42, an optocoupler U3, a resistor R16 and a capacitor C27. One end of the resistor R40 is connected to the output positive electrode OUT+ of the output rectifier circuit, and the other end is connected to the resistor R39, and one end of the resistor R39 is connected to the normally closed temperature protection switch JC1. The other end of the normally closed temperature protection switch JC1 is connected to the resistor R41, and the other end of the resistor R41 is connected to the resistor R46, and the other end of the resistor R46 is connected to the negative electrode OUT- of the output rectifier circuit. One end of the capacitor C24 is connected to the sampling voltage, and the other end is connected to the negative electrode OUT- of the output rectifier circuit. One end of the resistor R49 is connected to the positive electrode of the capacitor C24, and the other end is connected to the first pin of the optocoupler U3, and the negative electrode of the internal diode of the optocoupler U3 is connected to the output negative electrode OUT- of the output rectifier circuit. The first pin and the second pin of the optocoupler U3 are incorporated into the resistor R43. The 4th pin of the optocoupler U3 is connected to the VRER reference voltage, the 3rd pin of the optocoupler U3 is connected to the resistor R16 and the capacitor C27 in parallel, and one end of the capacitor C27 is grounded. The parameters of each circuit component in the figure are only examples and are not intended to limit the scope of protection of this application. The OC end of the voltage sampling circuit is input to the sampling voltage input end and the overheat protection signal input end of the MCU circuit.

[0071] The following is an explanation of the functional implementation of the voltage sampling circuit:

[0072] No-load state: The output voltage of the output rectifier circuit obtains a linear proportional value through the voltage sampling circuit. The MCU circuit determines that it is in a no-load state based on the voltage sampling signal, and outputs a control signal to limit the PWM pulse width through the XMK signal terminal.

[0073] Welding state: The output voltage of the output rectifier circuit is passed through the voltage sampling circuit to obtain a linear proportional value. The MCU circuit determines the welding state based on the voltage sampling signal, obtains the given signal, and obtains the current sampling signal at the same time. The MCU performs proportional integral operations based on the given signal, voltage sampling signal, and current sampling signal, and outputs the Ig1 signal to control the COMP terminal of the PWM chip in the PWM control circuit.

[0074] Short-circuit state: The output voltage of the output rectifier circuit obtains a linear proportional value through the voltage sampling circuit. The MCU circuit determines that it is in the output short-circuit state based on the voltage sampling signal, controls the SHDN terminal to output a high level to the PWM control circuit, and the output rectifier circuit maintains a very small output current.

[0075] Overheating state: When the temperature of the temperature protection switch JC1 exceeds the rated value, the temperature protection switch is activated and the OC voltage outputs a low level. When the MCU circuit recognizes the low level, the COMP terminal level of the PWM chip is pulled down through the SHDN signal, the output current of the output rectifier circuit is reduced, and the overheat protection lamp is lit.

[0076] like Fig.14 As shown, the current sampling circuit includes a resistor R20, a diode D5, a capacitor C42, a capacitor C40, a resistor R64, a resistor R63, a resistor R65, a capacitor C26 and a diode D9. Fig.15 As shown, the MCU circuit includes an MCU chip U7. The cathode of the diode D5 is connected to the resistor R64 and the capacitor C40, the resistor R64 and the capacitor C40 are connected to the ground in parallel, and the parallel circuit is connected to the resistor R63, the other end of the resistor R63 is connected to one end of the resistor R65, and the other end of the resistor R65 is grounded. The middle point of the resistor R63 and the resistor R65 is connected to one end of the capacitor C26, the other end of the capacitor C26 is grounded, one end of the connected diode D9 and the diode D10 is connected to +5V, one end is grounded, and the middle point is connected to the second pin of the MCU chip U7, and the current sampling signal is input to the MCU chip.

[0077] In this embodiment, the current sampling circuit also includes a shutdown signal output terminal, which is connected to the sampling terminal of the current sampling circuit through a resistor, and the shutdown signal output terminal is connected to the shutdown terminal of the PWM control chip through another resistor. The PWM control chip is configured to perform an overcurrent shutdown action when the input voltage of the shutdown terminal is greater than a preset voltage threshold.

[0078] like Figures 14 to 16 As shown, one end of the resistor R20 is connected to the capacitor C42, one end of the capacitor C42 is grounded, and the other end is connected to Fig.16The resistor R17 in the circuit, the other end of the resistor R17 is connected to the resistor R67, the resistor R67 and the capacitor C35 are connected in parallel and one end is grounded. The CFP-CP node corresponds to the shutdown signal output end of the current sampling circuit, which is connected to the sampling end IF through the resistor R20. One end of the resistor R17 is directly connected to the third pin of the PWM control chip U2. The current sampling circuit performs signal processing on the AC current collected from the primary winding side of the transformer circuit, converts the current signal into a voltage signal, and then filters it through the resistor R20 and the capacitor C42, divides the voltage through the voltage-dividing resistor R17 and the resistor R67, and is filtered by the capacitor C35 and input to the third pin of the PWM control chip U2. The third pin is the shutdown end of the PWM control chip. When the input voltage of the shutdown end is greater than the preset voltage threshold (such as 1V), the PWM control chip realizes fast overcurrent shutdown protection.

[0079] In this embodiment, the PWM control chip further includes a reference signal output terminal, and the reference signal output terminal is connected to the closed terminal of the PWM control chip through a slope compensation circuit. Fig.14 and Fig.16 As shown, the slope compensation circuit includes a transistor Q3, a resistor R61, a resistor R67 and a capacitor C35. The collector of the transistor Q3 is connected to the 8th pin of the PWM control chip U2 (corresponding to the reference signal output end of the PWM control chip), the base of the transistor Q3 is connected to the 4th pin of the PWM control chip U2, the emitter of the transistor Q3 is connected to the resistor R61, and the other end of the resistor R61 is connected to the 3rd pin of the PWM control chip U2. When in use, the triangular wave signal of the 8th pin of the PWM control chip is output through the emitter of the transistor Q3, and then superimposed with the CFB-CP signal of the shutdown signal output end of the current sampling circuit to the 3rd pin of the PWM control chip, that is, the same-direction input end of the current detection amplifier, and a slope compensation injection is used to eliminate harmonic disturbances, thereby improving the stability and anti-interference of the circuit.

[0080] The above content is a further detailed description of the present application in combination with specific preferred implementation methods, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be deemed to fall within the scope of protection of the present application.

Claims

1. An electric welding machine, characterized in that: It comprises a shell, a core module, a welding clamp and a grounding clamp, wherein the shell comprises a first shell and a second shell which enclose a receiving cavity, the core module is located inside the receiving cavity and is fixedly mounted on the second shell, and the welding clamp and the grounding clamp are fixedly connected to the core module and extend out of the receiving cavity; The first shell includes at least one first clip and at least one second clip, the second shell includes at least one third clip and at least one fourth clip, the first clip and the third clip are arranged opposite to each other and are connected to each other, the second clip and the fourth clip are arranged opposite to each other and are connected to each other, and the two side surfaces of the first shell are respectively clipped to the two side surfaces of the second shell.

2. The electric welding machine according to claim 1, characterized in that: The inner wall of the second shell is provided with at least one movement positioning column, and the movement module is installed on the second shell through the movement positioning column.

3. The electric welding machine according to claim 2, characterized in that: The movement module comprises a circuit board, the circuit board comprises at least one positioning hole, and the movement positioning column is penetrated in the positioning hole of the circuit board.

4. The electric welding machine according to claim 1, characterized in that: The core module includes a plurality of heat sinks. The interior of the first shell is provided with at least one reinforcing rib, and the surface of the reinforcing rib is relatively fitted with the top of the heat sink.

5. The electric welding machine according to claim 1, characterized in that: The first clip is an insertable clip, and at least one of the insertable clips is respectively provided on the two side surfaces of the first shell. The second clip is a cylindrical clip, the third clip is a first clip groove adapted to the shape of the insertable clip, and the fourth clip is a second clip groove adapted to the shape of the cylindrical clip.

6. The electric welding machine according to claim 1, characterized in that: It also includes a fan, an air inlet is provided on the side of the shell close to the fan, an air outlet is provided on the side of the shell opposite to the air inlet, and the core module includes multiple radiators, which are arranged between the air inlet and the air outlet.

7. The electric welding machine according to claim 6, characterized in that: The first shell is provided with a first fan slot, the second shell is provided with a second fan slot, the first fan slot and the second fan slot enclose a fan installation cavity, and the fan is installed inside the fan installation cavity.

8. The electric welding machine according to claim 1, characterized in that: It also includes a plug structure, which is fixedly installed on the first shell and the second shell through a fastening structure, and the installation direction of the fastening structure is perpendicular to the working horizontal plane of the electric welding machine.

9. The electric welding machine according to claim 8, characterized in that: The fastening structure includes a screw, and the screw is penetrated through the second shell, the plug structure and the first shell in a direction perpendicular to the working horizontal plane.

10. The electric welding machine according to claim 1, characterized in that: The welding clamp and the grounding clamp are respectively fixedly connected to the core module through an OT terminal.

11. The electric welding machine according to claim 1, characterized in that: The core module includes a control component, the control component includes a voltage conversion circuit, the voltage conversion circuit includes a heat sink, an insulated gate bipolar transistor and a bridge stack, and the insulated gate bipolar transistor and the bridge stack are arranged on the outside of the same heat sink.

12. The electric welding machine according to claim 11, characterized in that: The heat sink comprises a heat dissipation portion and a mounting portion, and the insulated gate bipolar transistor and the bridge stack are respectively arranged on two opposite side surfaces of the mounting portion.

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