An arc welder

Abstract

This invention discloses an arc welding machine. The arc welding machine includes a welding machine housing, a welding handle, a connecting pipe, and an automatic electrode feeding mechanism. The welding machine housing has a positive terminal interface and a negative terminal interface, with the positive terminal interface connected to the welding handle. The automatic electrode feeding mechanism includes a push plate, a slider, a through groove, a limiting screw, and a stepper motor. The push plate is slidably disposed within the connecting pipe and serves to abut one end of the electrode. The slider is connected to the push plate and slides in cooperation with the through groove on the side wall of the connecting pipe. The limiting screw passes through the slider and is threadedly engaged with it. The stepper motor drives the limiting screw to rotate, causing the slider to move axially along the connecting pipe under the limiting action of the through groove, and driving the push plate to push the electrode outward. This invention can automatically push the electrode to compensate for its movement when the electrode melts and shortens during welding, maintaining a relatively stable welding distance between the electrode and the welding area, improving welding stability, and reducing the impact of sparks on the operator through an anti-spatter baffle.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, and specifically to an electric arc welding machine. Background Technology

[0002] Manual arc welding is a widely used welding process. Its basic principle is to establish an electric arc between the welding electrode and the workpiece using a welding power source. The high temperature generated by the arc melts the tip of the welding electrode and the area of ​​the workpiece to be welded. The molten electrode metal and the base metal together form a weld pool, which, after cooling and solidifying, forms the weld, thus achieving the connection between metal components. Manual arc welding has advantages such as simple equipment structure, strong adaptability, flexible operation, and low requirements for construction sites. Therefore, it is widely used in machinery manufacturing, building steel structures, pressure vessels, pipeline construction, equipment maintenance, shipbuilding, agricultural machinery repair, and various metal component processing fields.

[0003] Traditional manual arc welding equipment typically includes a welding machine housing, output ports, grounding clamps, and a welding handle. During use, the grounding clamps are connected to the workpiece, and the welding handle holds the welding electrode and transmits welding current to it. The operator holds the welding handle, maintaining a proper distance between the electrode tip and the workpiece. An electric arc is generated between the electrode tip and the workpiece, achieving welding. Because manual arc welding relies primarily on the operator's hand movements to control the electrode position, weld quality is closely related to the operator's experience, hand stability, posture control ability, and ability to judge the arc state.

[0004] In manual arc welding, a crucial control factor is arc length. Arc length can generally be understood as the distance between the electrode tip and the molten pool or welding area of ​​the workpiece. If the arc length is too long, the welding voltage increases, the arc diverges, the heat input distribution becomes unstable, and welding spatter increases, easily leading to poor weld formation, undercut, porosity, slag inclusions, or increased weld deformation. If the arc length is too short, the electrode easily sticks to the workpiece, the arc is unstable, the molten pool is difficult to form properly, and defects such as arc breakage, electrode sticking, and weld discontinuity are also likely to occur. Therefore, maintaining a suitable and stable distance between the electrode tip and the welding area is an important condition for obtaining high-quality welds in manual arc welding.

[0005] However, the welding rod used in manual arc welding continuously melts and is consumed during the welding process. As the tip of the rod continues to melt, its length shortens. If the operator keeps the welding handle still, the distance between the rod tip and the workpiece will gradually increase, causing a change in the arc length. To maintain a stable arc length, the operator must continuously push the welding handle towards the workpiece during welding, or adjust their wrist and arm posture to keep the rod tip in the correct position. This operation requires a high level of skill and concentration. For beginners, it is often difficult to maintain a stable distance between the rod and the workpiece as the rod shortens; even for experienced welders, fatigue or posture limitations can easily cause fluctuations in welding distance during long working hours, in confined spaces, or in complex conditions such as overhead or vertical welding.

[0006] In existing technologies, some welding equipment can achieve continuous wire feeding through automatic wire feeding mechanisms. For example, the wire feeding device in gas shielded welding equipment can continuously feed the welding wire into the welding area according to set parameters. However, the welding wire for gas shielded welding is generally a continuous coiled or tubular metal wire, and its wire feeding form, conductivity method, and welding process differ significantly from those of manual arc welding electrodes. Manual arc welding electrodes are usually rod-shaped electrodes of a certain length with an outer coating. During welding, the entire electrode is held and conducts electricity by the welding handle. Its structure and usage are not suitable for directly using the continuous wire feeding structure of traditional wire feeders. Therefore, it is of practical significance to develop an automatic feeding mechanism for manual arc welding electrodes that is compact, can be installed near the welding handle, and can automatically compensate for the electrode extension length as the electrode melts and shortens.

[0007] Besides the issue of electrode distance control, manual arc welding also presents the problem of spatter protection. When an arc is formed between the electrode and the workpiece, high-temperature molten droplets, slag, and sparks are generated as spatter. These spatters are hot and can burn the operator's hands, arms, or face, and may also damage the outer surface of the welding equipment or surrounding flammable materials. Operators typically wear welding masks, protective gloves, and work clothes, but traditional welding grips often lack localized protective structures for the area around the hands. In certain special welding positions, such as overhead welding, fillet welding, welding in confined spaces, or close-range repair welding, sparks may splash from the side or in the opposite direction, posing a safety hazard to the operator.

[0008] Therefore, existing manual arc welding machines have at least the following problems: First, the electrode continuously shortens during welding, requiring operators to constantly adjust the distance between the electrode and the welding area, making welding stability highly susceptible to human factors; Second, traditional welding grips lack a mechanical structure that can automatically feed the electrode as it shortens, which is not conducive to reducing the difficulty of operation; Third, the electrode movement requires both stable clamping and reliable conductivity, and existing simple clamping structures cannot simultaneously meet the requirements of automatic feeding and stable conductivity; Fourth, sparks and molten metal spatter generated during welding can easily affect operational safety, and existing welding grips lack a detachable anti-spatter baffle structure that does not obstruct the view.

[0009] Based on the above problems, it is necessary to provide an improved manual arc welding machine that can automatically push the welding rod outward during the continuous melting and shortening of the welding rod, reduce manual compensation operations, improve welding stability, and at the same time take into account the functions of welding rod clamping, conductivity and anti-spatter safety protection. Summary of the Invention

[0010] The main objective of this invention is to provide a manual arc welding machine with automatic electrode feeding and anti-spatter functions. By setting a connecting pipe at one end of the welding handle and setting an automatic electrode feeding mechanism inside the connecting pipe, the electrode can be automatically pushed outward as it melts and shrinks during the welding process, thereby maintaining a relatively stable welding distance between the electrode tip and the welding area.

[0011] Another objective of this invention is to provide an automatic feeding mechanism suitable for manual arc welding electrodes. This mechanism uses a stepper motor to drive a limiting screw to rotate, and then through the threaded engagement between the limiting screw and the slider, as well as the limiting effect of the through groove on the slider, the rotational motion is converted into the linear motion of the push plate along the axial direction of the connecting pipe, thereby achieving precise and stable feeding of the welding electrode.

[0012] Another objective of the present invention is to provide a welding electrode clamping and limiting mechanism that enables the welding electrode to be stably confined within the connecting pipe, preventing the welding electrode from slipping out randomly, swaying radially, or being mispositioned during welding or feeding, while not hindering the pusher plate from pushing the welding electrode to move axially along the connecting pipe.

[0013] Another objective of this invention is to provide a welding electrode conductive clamping mechanism, which enables the conductive core to remain in contact with the welding electrode under the elastic action of the limiting spring, thereby maintaining reliable electrical contact as the welding electrode is gradually fed outward, and avoiding unstable conductive contact caused by the movement of the welding electrode.

[0014] Another objective of this invention is to provide a splash guard assembly that, through the cooperation of a fixing ring, a slot, a limiting groove, an insert block, a second bolt, and a transparent high-temperature resistant baffle, allows the baffle to be detachably installed on the outside of the welding handle, thereby blocking sparks from flying without significantly obstructing the view and improving welding safety.

[0015] A manual arc welding machine with automatic electrode feeding and anti-spatter functions includes a welding machine housing, a welding handle, a connecting pipe, and an automatic electrode feeding mechanism. The welding machine housing has a positive terminal and a negative terminal, with the positive terminal connected to the welding handle. The connecting pipe is located at one end of the welding handle and is used to hold the electrode and guide its axial movement along the connecting pipe. The automatic electrode feeding mechanism includes a push plate, a slider, a through slot, a limiting screw, and a stepper motor. The push plate is slidably disposed within the connecting pipe and abuts against one end of the electrode. The slider is connected to the push plate, and the through slot is located on the side of the connecting pipe near the slider, with the slider slidingly engaged with the through slot. The limiting screw passes through the slider and is threadedly engaged with it, and is drively connected to the output end of the stepper motor. The stepper motor drives the limiting screw to rotate, causing the slider to move axially along the connecting pipe under the limiting action of the through slot, and driving the push plate to push the electrode outward.

[0016] Furthermore, the outside of the welding machine housing is equipped with a current adjustment knob, a ventilation hood, a positive terminal interface, and a negative terminal interface. The negative terminal interface is connected to the grounding clamp, and a power switch is located on one side of the welding handle. The current adjustment knob is used to adjust the welding current, the ventilation hood is used for heat dissipation of the welding machine housing, the grounding clamp is used to connect the workpiece to be welded, and the power switch is used to control the energization status of the welding rod.

[0017] Furthermore, one end of the limiting screw is movably connected to the connecting pipe via a bearing, while the other end of the limiting screw is fixedly connected to the output shaft of the stepper motor, which is fixedly mounted on the connecting pipe. Supporting one end of the limiting screw with a bearing reduces its rotational resistance and improves its rotational stability; fixing the other end of the limiting screw to the stepper motor's output shaft allows the stepper motor's output torque to be directly transmitted to the limiting screw.

[0018] Furthermore, the through groove extends axially along the connecting pipe, and the cross-sectional shape of the slider matches that of the through groove to restrict the slider from rotating synchronously with the limiting screw. Since the slider and the limiting screw are threaded together, if the slider is not subject to anti-rotation restriction when the limiting screw rotates, the slider may rotate with the limiting screw but fail to effectively generate axial movement. This invention restricts the circumferential rotation of the slider through the through groove, ensuring that the slider can only move axially along the connecting pipe, thereby achieving stable motion conversion.

[0019] Furthermore, a welding electrode clamping and limiting mechanism is provided on the connecting pipe. The welding electrode clamping and limiting mechanism includes a first bolt, a receiving groove, and a limiting plate. The first bolt passes through the connecting pipe and is threadedly connected to it. The receiving groove is located on the side of the connecting pipe near the first bolt. The end of the first bolt near the receiving groove is movably connected to the limiting plate, and the first bolt is used to move the limiting plate closer to or further away from the welding electrode. By rotating the first bolt, the position of the limiting plate relative to the welding electrode can be adjusted, so that the limiting plate forms an appropriate clamping force on the welding electrode, thereby adapting to welding electrodes of different diameters.

[0020] Furthermore, the electrode clamping and limiting mechanism also includes a sliding groove and a sliding rod. The sliding groove is formed on one side of the receiving groove, and the sliding rod slides into the sliding groove. One end of the sliding rod is fixedly connected to the limiting plate to limit the displacement of the limiting plate during movement. The cooperation between the sliding rod and the sliding groove can improve the guiding stability of the limiting plate during movement, prevent the limiting plate from rotating or tilting with the first bolt, thereby improving the electrode clamping stability.

[0021] Furthermore, a welding electrode conductive pressure clamping mechanism is provided on the connecting pipe. This mechanism includes a slide, a limiting spring, and a conductive core. The slide slides through the connecting pipe, and the limiting spring is sleeved on the slide, with its two ends connected to the connecting pipe and the slide, respectively. The conductive core is located inside the slide and is used to contact the welding electrode. Under the elastic action of the limiting spring, the slide moves towards the welding electrode, ensuring that the conductive core maintains conductive contact with the electrode. During feeding, the welding electrode moves axially relative to the connecting pipe, and the conductive core contacts the electrode through elastic clamping, ensuring a stable electrical connection without completely hindering the electrode's movement.

[0022] Furthermore, the push plate, limit plate, and / or carriage are made of insulating and high-temperature resistant materials, including alumina. Alumina has good heat resistance, insulation properties, and structural stability, making it suitable for use in support, limit, or clamping components near high-temperature welding environments.

[0023] Furthermore, the manual arc welding machine also includes an automatic electrode feeding control system, which is electrically connected to a stepper motor. The automatic electrode feeding control system is configured to acquire or receive welding current and / or welding voltage during the welding process, and control the speed, direction, and / or rotation amount of the stepper motor according to changes in welding current and / or welding voltage, thereby adjusting the electrode feeding speed and / or feeding distance. Since changes in the distance between the electrode tip and the welding area typically cause changes in welding voltage or welding current, by detecting changes in welding electrical parameters and controlling the stepper motor's movement, linkage between electrode feeding and welding status can be achieved.

[0024] Furthermore, a spatter shield assembly is provided on the outer side of the welding grip. The spatter shield assembly includes a retaining ring, a slot, a limiting groove, a baffle, a plug, and a second bolt. The retaining ring is fixed to the outer side of the welding grip, and the slot and limiting groove are located on the retaining ring. The plug is fixed to the baffle and engages with the slot. The second bolt passes through the baffle and connects to the limiting groove to detachably fix the baffle to the outer side of the retaining ring. The baffle is made of a transparent, high-temperature resistant material to block sparks generated during welding. This structure allows for easy installation and removal of the baffle, facilitating replacement and cleaning, while preventing sparks from directly hitting the operator's hands.

[0025] Compared with existing technologies, this invention has the following advantages: This invention features a connecting pipe at one end of the welding handle, and within the connecting pipe is an automatic electrode feeding mechanism consisting of a push plate, a slider, a through groove, a limiting screw, and a stepper motor. This allows the electrode to be automatically pushed outward by the push plate as it shrinks during welding, thus compensating for electrode length loss. This structure reduces the need for operators to frequently manually adjust the distance between the electrode and the welding area, helping to reduce the difficulty of manual arc welding. This invention drives the limiting screw to rotate via a stepper motor, achieving linear displacement of the push plate through the threaded engagement between the limiting screw and the slider. Stepper motors have advantages such as controllable rotation angle, fast response, and high control precision, thus enabling more accurate control of the electrode feed amount, making the electrode feeding process more stable and controllable. This invention uses the through groove to prevent the slider from rotating synchronously with the limiting screw, instead moving axially along the connecting pipe. This structure is simple and reliable, effectively converting rotational motion into linear motion and improving the operational stability of the automatic electrode feeding mechanism. This invention, by incorporating a welding electrode clamping and limiting mechanism, ensures the welding electrode is properly clamped by a limiting plate, preventing it from slipping out of the connecting pipe or shifting significantly within it. The limiting plate's position can be adjusted via a first bolt, thus accommodating welding electrodes of different diameters and increasing the equipment's applicability. The invention also features a sliding groove and a sliding rod, guiding the limiting plate as it moves closer to or away from the welding electrode by the first bolt, reducing the possibility of offset or tilting and resulting in more stable electrode clamping. Furthermore, the invention incorporates a sliding frame, limiting spring, and conductive core, ensuring the conductive core remains in continuous contact with the welding electrode under elastic action. During automatic feeding, the welding electrode moves axially along the connecting pipe; a rigid fixing method for the conductive core could lead to unstable contact or excessive friction due to electrode movement. This invention employs an elastic clamping method, balancing conductive reliability with smooth electrode feeding. In this invention, the push plate, limiting plate, and slide can be made of insulating and high-temperature resistant materials such as alumina, enabling these components to maintain good insulation and structural stability near the high temperature and current environment of welding, reducing the possibility of adverse effects of the energized welding rod on related mechanisms. This invention can be equipped with an automatic electrode feeding control system, which controls the stepper motor's movement by collecting changes in welding current and / or welding voltage, thereby adapting the automatic electrode feeding to the actual welding state. Compared to fixed-speed feeding, the control method based on welding state feedback can better adapt to dynamic changes during the welding process. This invention uses an anti-spatter baffle assembly to form local protection on the outside of the welding handle, blocking some sparks and molten metal spatter, reducing the risk of operator's hands being affected by spatter. The baffle is made of transparent high-temperature resistant material, providing protection without significantly affecting the operator's observation of the welding area. The overall structure of this invention is compact and can be used in conjunction with the welding handle of a manual arc welding machine without changing the basic operation method of manual arc welding, making it highly valuable for widespread application. Attached Figure Description

[0026] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0027] Figure 1 This is a schematic diagram of the overall structure of the arc welding machine provided in an embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the structural relationship between the connecting pipe, push plate, slider, through groove, limiting screw, stepper motor, and welding rod in an embodiment of the present invention. Figure 3 This is a schematic diagram of the fit between the first bolt, the receiving groove, the sliding groove, the limiting plate, and the sliding rod in an embodiment of the present invention. Figure 4 This is a schematic diagram illustrating the fit between the fixing ring, slot, limiting groove, baffle, insert block, and second bolt in an embodiment of the present invention. Figure 5 This is a three-dimensional structural diagram of the limiting screw, the first bolt, and the connecting pipe in an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures: 1. Welding machine housing; 11. Current adjustment knob; 12. Ventilation hood; 13. Positive terminal; 14. Negative terminal; 15. Grounding clamp; 16. Welding handle; 17. Power switch; 18. Connecting pipe; 2. Push plate; 21. Slider; 22. Through slot; 23. Limiting screw; 24. Stepper motor; 25. First bolt; 26. Storage slot; 27. Slide groove; 28. Limiting plate; 29. ​​Slide rod; 3. Slide frame; 31. Limiting spring; 32. Conductive core; 4. Welding rod; 5. Fixing ring; 51. Slot; 52. Limiting groove; 53. Baffle; 54. Insert block; 55. Second bolt. Detailed Implementation

[0029] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the following embodiments are only used to explain the present invention and are not intended to limit the scope of protection of the present invention. Any equivalent substitutions, conventional modifications, or improvements made to the present invention within the concept and principles of the present invention should fall within the scope of protection of the present invention.

[0030] In the description of this invention, terms such as "upper," "lower," "inner," "outer," "one end," "the other end," "near," "far from," and "axial," etc., referring to orientation or positional relationships, are generally used based on the orientation or relative relationships shown in the accompanying drawings. Their purpose is to facilitate understanding of the technical solution of this invention and should not be construed as absolute limitations on the installation orientation or usage state of related components. Unless otherwise explicitly stated, terms such as "connection," "fixed," "installed," "fitting," "docking," "penetrating," and "sliding" should be interpreted broadly. For example, "connection" can be a direct connection or an indirect connection through intermediate components; it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection. Those skilled in the art can understand the meaning of the above terms in this invention in conjunction with the specific technical content.

[0031] like Figures 1 to 5 As shown, this embodiment provides a manual arc welding machine with automatic electrode feeding and anti-spatter functions. The manual arc welding machine includes a welding machine housing 1, a welding handle 16, a connecting pipe 18, and an automatic electrode feeding mechanism.

[0032] The welding machine housing 1 serves as the power supply and control unit for the welding equipment. It houses the welding power supply, current regulation circuit, heat dissipation components, and related control elements. The welding machine housing 1 is equipped with a positive terminal 13 and a negative terminal 14. The positive terminal 13 is connected to the welding handle 16, and the negative terminal 14 is connected to the grounding clamp 15. During welding, the grounding clamp 15 is used to hold the workpiece to be welded or to establish an electrical connection with the workpiece, while the welding handle 16 supplies welding current to the welding electrode 4, forming a welding arc between the welding electrode 4 and the workpiece.

[0033] In one specific embodiment, the welding machine housing 1 is provided with a current adjustment knob 11, a ventilation hood 12, a positive terminal interface 13, and a negative terminal interface 14 sequentially arranged on the outside. The current adjustment knob 11 is used to adjust the welding current to adapt to different electrode diameters, workpiece thicknesses, and welding process requirements. The ventilation hood 12 forms a heat dissipation channel, allowing the heat-generating components inside the welding machine housing 1 to dissipate heat in a timely manner during operation, reducing the possibility of equipment performance degradation or failure due to high temperature. The positive terminal interface 13 is connected to the welding handle 16, and the negative terminal interface 14 is connected to the grounding clamp 15. A power switch 17 is provided on one side of the welding handle 16, which is used to control the energization status of the welding handle 16 and the welding electrode 4, allowing the operator to easily start or stop welding while holding the welding handle 16.

[0034] A connecting tube 18 is disposed at one end of the welding handle 16. The connecting tube 18 can be fixedly connected to the welding handle 16, or it can be installed at the end of the welding handle 16 by means of threads, snap-fit, plug-in, or other detachable connection methods. The interior of the connecting tube 18 forms a channel for accommodating the welding rod 4. After the welding rod 4 is inserted into the connecting tube 18, it can move axially within the connecting tube 18. The connecting tube 18 serves two purposes: firstly, to accommodate the welding rod 4 and restrict the direction of movement of the welding rod 4; secondly, to support structures such as the automatic welding rod feeding mechanism, the welding rod clamping and limiting mechanism, and the welding rod conductive voltage tightening mechanism.

[0035] The automatic electrode feeding mechanism includes a push plate 2, a slider 21, a through groove 22, a limit screw 23, and a stepper motor 24.

[0036] The push plate 2 is slidably disposed within the connecting pipe 18 and serves to abut one end of the welding rod 4. When the welding rod 4 is inserted into the connecting pipe 18, the tail end of the welding rod 4 contacts the push plate 2. The push plate 2 can be designed as circular, arc-shaped, plate-shaped, or other shapes suitable for sliding within the connecting pipe 18, depending on the internal shape of the connecting pipe 18. Preferably, the external dimensions of the push plate 2 are adapted to the inner cavity of the connecting pipe 18, so that the push plate 2 can move smoothly along the axial direction of the connecting pipe 18 without significant shaking within the connecting pipe 18.

[0037] The slider 21 is connected to the push plate 2. In one specific embodiment, the slider 21 is fixed to the upper side of the push plate 2. The two can be integrally formed or fixedly connected by screws, riveting, welding, bonding, or embedding. A through groove 22 is provided on the side of the connecting tube 18 near the slider 21, and the through groove 22 extends axially along the connecting tube 18. The slider 21 extends at least partially into the through groove 22 and slides in contact with the through groove 22. The through groove 22 provides a guide for the movement of the slider 21 and also provides circumferential limiting for the slider 21.

[0038] A limiting screw 23 passes through the slider 21 and is threadedly engaged with it. The limiting screw 23 is axially positioned along the connecting pipe 18. One end of the limiting screw 23 is movably connected to the connecting pipe 18 via a bearing, and the other end is fixedly connected to the output shaft of the stepper motor 24. The stepper motor 24 is fixedly mounted on the connecting pipe 18. When the stepper motor 24 operates, its output shaft drives the limiting screw 23 to rotate. Because the slider 21 is slidably engaged with the through slot 22, the through slot 22 restricts the slider 21 from rotating synchronously with the limiting screw 23. Therefore, when the limiting screw 23 rotates, the slider 21 moves axially along the limiting screw 23 due to the threaded effect. The slider 21 further drives the push plate 2 to move axially along the connecting pipe 18, causing the push plate 2 to push the welding rod 4 outward.

[0039] The motion conversion process is as follows: the stepper motor 24 outputs rotational motion, the limiting screw 23 rotates accordingly, the slider 21 moves axially due to the anti-rotation constraint of the through groove 22, the push plate 2 moves with the slider 21 and pushes the welding rod 4, and the welding rod 4 extends outward along the axial direction of the connecting pipe 18. Since the rotation angle and number of rotation steps of the stepper motor 24 can be controlled relatively precisely, the displacement of the push plate 2 can also be determined by the pitch of the limiting screw 23 and the rotation of the stepper motor 24. Therefore, this automatic feeding mechanism can push the welding rod 4 with high controllability.

[0040] During welding, the tip of the welding electrode 4 continuously melts and is consumed, causing the overall length of the welding electrode 4 to gradually shorten. If the welding electrode 4 is not compensated for, the distance between the tip of the welding electrode 4 and the welding area will gradually increase, resulting in a change in the arc length. In this embodiment, the stepper motor 24 drives the push plate 2 to push the welding electrode 4 outward, which can compensate for the reduction in length caused by the melting and consumption of the welding electrode 4, and maintain a relatively stable distance between the tip of the welding electrode 4 and the welding area.

[0041] Compared with the traditional method of manually and continuously feeding the welding rod, the automatic electrode feeding mechanism of this embodiment has significant advantages. First, the feeding action is completed by a mechanical structure, reducing the burden on the welder's hands for continuous fine-tuning. Second, the screw mechanism driven by the stepper motor 24 can achieve relatively stable and controllable feeding, and is less prone to uneven feeding caused by manual shaking. Third, the mechanism is installed in the connecting tube 18 at the end of the welding handle 16, with a relatively compact structure, eliminating the need for complex external wire feeding equipment, and is suitable for manual arc welding electrode usage scenarios.

[0042] To ensure that the welding electrode 4 is stably confined within the connecting pipe 18 while still being able to move axially under the action of the push plate 2, this embodiment includes a welding electrode clamping and limiting mechanism on the connecting pipe 18. The welding electrode clamping and limiting mechanism includes a first bolt 25, a receiving groove 26, and a limiting plate 28.

[0043] The first bolt 25 passes through the connecting pipe 18 and is threadedly connected to the connecting pipe 18. A receiving groove 26 is formed on the side of the connecting pipe 18 near the first bolt 25, providing space for the limiting plate 28 to be accommodated and moved. The end of the first bolt 25 near the receiving groove 26 is movably connected to the limiting plate 28. In a preferred embodiment, the end of the first bolt 25 near the limiting plate 28 is connected to the limiting plate 28 via a bearing, allowing the first bolt 25 to rotate relative to the limiting plate 28, while the limiting plate 28 does not rotate synchronously with the first bolt 25. When the first bolt 25 rotates, due to its threaded engagement with the connecting pipe 18, the first bolt 25 moves axially, causing the limiting plate 28 to move closer to or away from the welding rod 4.

[0044] After the welding electrode 4 is inserted into the connecting pipe 18, the operator can rotate the first bolt 25 to gradually bring the limiting plate 28 closer to the welding electrode 4. Once a suitable clamping force is formed between the limiting plate 28 and the welding electrode 4, rotation of the first bolt 25 is stopped. At this point, the welding electrode 4 is confined inside the connecting pipe 18, preventing it from slipping out or shifting radially. Because the clamping force of the limiting plate 28 on the welding electrode 4 can be adjusted by the first bolt 25, this structure can accommodate welding electrodes 4 of different diameters.

[0045] The electrode clamping and limiting mechanism also includes a sliding groove 27 and a sliding rod 29. The sliding groove 27 is located on one side of the receiving groove 26, and the sliding rod 29 is slidably connected to the sliding groove 27. One end of the sliding rod 29 is fixedly connected to the limiting plate 28. After the sliding rod 29 and the sliding groove 27 are engaged, the limiting plate 28 is guided and constrained during movement, making it less prone to tilting, deflection, or rotation with the first bolt 25. This allows the limiting plate 28 to approach the electrode 4 in a more stable posture, resulting in a more uniform clamping effect.

[0046] It should be noted that the clamping of the welding rod 4 by the limiting plate 28 does not completely lock the welding rod 4, but rather forms a limiting state that prevents the welding rod 4 from shaking freely while allowing the welding rod 4 to move axially along the connecting pipe 18 under the pushing force of the push plate 2. In other words, the clamping force between the limiting plate 28 and the welding rod 4 should be controlled within an appropriate range. If the clamping force is too large, the feeding resistance of the welding rod 4 will increase, which may affect the push plate 2 from pushing the welding rod 4; if the clamping force is too small, the welding rod 4 may deviate during the welding process. In this embodiment, the position of the limiting plate 28 can be adjusted by the first bolt 25, allowing the operator to adjust the clamping state according to the specifications of the welding rod 4 and the actual usage.

[0047] The manual arc welding electrode 4 requires welding current during the welding process, therefore the automatic feeding structure must simultaneously address the conductivity issue during the electrode 4's movement. To this end, this embodiment includes an electrode conductivity tightening mechanism on the connecting pipe 18. The electrode conductivity tightening mechanism includes a slide 3, a limiting spring 31, and a conductive core 32.

[0048] The slide 3 slides through the connecting pipe 18. A limiting spring 31 is sleeved on the slide 3, with its two ends connected to the connecting pipe 18 and the slide 3, respectively. A conductive core 32 is disposed inside the slide 3 and is used to contact the welding rod 4. Under the elastic action of the limiting spring 31, the slide 3 moves toward the welding rod 4, causing the conductive core 32 to press against the surface of the welding rod 4. After the power switch 17 is turned on, the welding current is transmitted through the internal circuit of the welding handle 16 to the conductive core 32, and then from the conductive core 32 to the welding rod 4, thereby enabling the welding rod 4 to generate an electric arc with the workpiece.

[0049] The conductive core 32 can be made of copper, copper alloy, or other materials with good conductivity. Surface contact or line contact is preferably used between the conductive core 32 and the welding rod 4 to improve conductivity stability. The slide 3, under the action of the limiting spring 31, can automatically compensate for the contact gap between the conductive core 32 and the welding rod 4. When the welding rod 4 is fed outwards by the pusher plate 2, the welding rod 4 slides relative to the conductive core 32, while the conductive core 32 remains in contact with the welding rod 4 under elastic action, thus maintaining continuous conductivity.

[0050] This structure has advantages over rigid clamping conductive methods. While rigid clamping of the electrode 4 by the conductive component can provide strong conductive contact, it may significantly increase the resistance to electrode 4 movement, affecting automatic feeding. Conversely, insufficient contact pressure from the conductive component may lead to poor contact during electrode 4 movement, resulting in an unstable arc. This embodiment utilizes a limiting spring 31 to provide elastic clamping force, allowing the electrode 4 to slide relative to the contact while ensuring conductive contact, making it more suitable for applications requiring automatic electrode feeding.

[0051] In a preferred embodiment, the push plate 2, the limiting plate 28, and the slide 3 are made of alumina. Alumina has good electrical insulation and high-temperature resistance, which can reduce the current influence on these structural components after the welding rod 4 is energized, while also being able to withstand the high temperatures near the welding point. In addition to alumina, other insulating and high-temperature resistant materials, such as zirconia ceramics, silicon nitride ceramics, high-temperature resistant composite materials, or engineering ceramics, can also be used as substitutes depending on actual manufacturing conditions and cost requirements.

[0052] To ensure that the automatic electrode feeding action matches the actual welding state, this embodiment may also include an automatic electrode feeding control system. The automatic electrode feeding control system is electrically connected to the stepper motor 24 and is configured to collect or receive welding current and / or welding voltage during the welding process. Based on changes in welding current and / or welding voltage, it controls the speed, direction, and / or amount of rotation of the stepper motor 24 to adjust the feeding speed and / or feeding distance of the electrode 4.

[0053] In manual arc welding, changes in the distance between the electrode tip (4) and the welding area are typically reflected in changes in welding voltage and welding current. For example, when the electrode tip (4) is farther from the workpiece, the arc length increases, the welding voltage may rise, and the welding current may change accordingly. Conversely, when the electrode tip (4) is too close to the workpiece, a decrease in voltage, an increase in current, or a tendency for the electrode to stick may occur. The automatic electrode feed control system can determine whether to advance the electrode (4) based on these changes in electrical parameters.

[0054] In one specific embodiment, the automatic electrode feeding control system may include a current sampling unit, a voltage sampling unit, a control unit, and a drive unit. The current sampling unit is used to collect the welding circuit current, and the voltage sampling unit is used to collect the welding circuit voltage. The control unit receives the sampling signals output by the current sampling unit and the voltage sampling unit, and compares the sampling signals with a preset reference range. When the control unit determines that the distance between the electrode 4 and the welding area has increased and feeding is required, it outputs a control signal to the drive unit. The drive unit drives the stepper motor 24 to rotate a certain number of steps according to the control signal, causing the pusher plate 2 to push the electrode 4 outward a certain distance.

[0055] The control unit can be a microcontroller, programmable logic controller, or other controller with signal processing capabilities. The drive unit can be a stepper motor driver. The control method can be closed-loop control, semi-closed-loop control, or open-loop preset feed control. In closed-loop control, the control unit continuously corrects the action of the stepper motor 24 based on changes in current and voltage, making the feed of the welding electrode 4 more closely match the actual welding state. In semi-closed-loop or open-loop control, the control unit can set a preset feed speed based on the specifications of the welding electrode 4, the welding current, and empirical parameters, and then correct it based on abnormal fluctuations in voltage or current.

[0056] For example, in one feasible control logic, the control system presets a stable welding voltage range. When the welding voltage exceeds the upper limit of this range and persists for more than a preset time, the control unit determines that the distance between the end of the welding electrode 4 and the welding area has increased, and thus controls the stepper motor 24 to rotate forward, causing the pusher plate 2 to push the welding electrode 4 outward; when the welding voltage returns to the reference range, the control unit stops the stepper motor 24. As another example, when the welding current drops to near a preset lower limit, the control system can determine the arc lengthening trend and perform feed compensation. The above control logic is merely an example and does not limit the scope of protection of this invention.

[0057] In another embodiment, the automatic electrode feeding control system can also employ a timed feeding strategy. For example, after welding begins, the control system controls the stepper motor 24 to drive the pusher plate 2 to move at certain intervals and steps according to a preset feeding speed, so that the electrode 4 is continuously or intermittently fed outwards. The timed feeding strategy has a simple structure and is suitable for working conditions where the electrode melting speed is relatively stable. To improve adaptability, the timed feeding strategy can also be superimposed with current or voltage feedback correction, temporarily adjusting the feeding speed or feeding amount when an abnormal change in the arc length is detected.

[0058] In this embodiment, a splash guard assembly can also be provided on the outside of the welding grip 16. The splash guard assembly includes a retaining ring 5, a slot 51, a limiting groove 52, a baffle 53, an insert block 54, and a second bolt 55.

[0059] The retaining ring 5 is fixed to the outside of the welded grip 16. The retaining ring 5 can be connected to the welded grip 16 by integral molding, screw fixing, snap-fit ​​fixing, adhesive fixing, or other methods. The slot 51 and the limiting groove 52 are provided on the retaining ring 5. The insert block 54 is fixed to the baffle 53 and engages with the slot 51. The second bolt 55 passes through the baffle 53 and connects to the limiting groove 52 to detachably fix the baffle 53 to the outside of the retaining ring 5.

[0060] When installing the baffle 53, the operator first places the baffle 53 outside the fixing ring 5, aligns the insert 54 with the slot 51, and inserts it. After the insert 54 is inserted into the slot 51, the baffle 53 is initially positioned. Then, the second bolt 55 is screwed into the limiting groove 52, connecting the second bolt 55 with the limiting groove 52, thereby fixing the baffle 53 outside the fixing ring 5. To disassemble, unscrew the second bolt 55 in the opposite direction, and then pull the insert 54 out of the slot 51.

[0061] The baffle 53 is made of a transparent, high-temperature resistant material and is used to block sparks generated during welding. The transparency allows operators to observe the welding area through the baffle 53, preventing obstruction of vision and ensuring smooth welding operations. The high-temperature resistant material prevents the baffle 53 from deforming, melting, or being damaged by welding spatter. The baffle 53 can be made of transparent, high-temperature resistant plastic, heat-resistant glass, transparent ceramic materials, or other materials with both heat resistance and light transmission properties.

[0062] In a preferred embodiment, two baffles 53 can be provided, each installed on the outside of the fixing ring 5 to expand the shielding range against welding sparks. Depending on the application, the baffles 53 can be designed as flat plates, curved plates, bent plates, or a combination of these structures. The size and angle of the baffles 53 can be optimized based on the shape of the welding handle 16 and welding operating habits to maximize the protective effect without affecting the operation and observation of the welding electrode 4.

[0063] The anti-spatter baffle assembly does not affect the basic operation of the automatic electrode feeding mechanism. The baffle 53 primarily serves a safety protection function, and its detachable structure facilitates cleaning, replacement, and maintenance. When welding slag or spatter adheres to the surface of the baffle 53 and obstructs visibility, it can be removed for cleaning or replaced with a new baffle 53.

[0064] When using the manual arc welding machine of the present invention, the operator first connects the grounding clamp 15 to the workpiece to be welded, and adjusts the welding current according to the specifications of the welding rod 4 and the material of the workpiece by adjusting the current adjustment knob 11. Then, the welding rod 4 is inserted into the connecting tube 18 so that one end of the welding rod 4 abuts against the push plate 2.

[0065] Before or during the insertion of the welding rod 4, the operator can pull the slide 3 outward to temporarily move the conductive core 32 away from the internal channel of the connecting pipe 18, thus facilitating the insertion of the welding rod 4. After the welding rod 4 is inserted into place, the slide 3 is released, and the slide 3 moves towards the welding rod 4 under the action of the limiting spring 31, causing the conductive core 32 to press against the surface of the welding rod 4. Subsequently, the operator rotates the first bolt 25 to bring the limiting plate 28 closer to the welding rod 4 and form a proper clamping effect on the welding rod 4. The sliding rod 29 cooperates with the sliding groove 27 to ensure smooth movement of the limiting plate 28 and prevent the limiting plate 28 from tilting.

[0066] After clamping the welding rod 4, the operator can install the baffle 53 as needed. During installation, insert the insert block 54 on the baffle 53 into the slot 51 on the fixing ring 5, and connect it to the limiting groove 52 with the second bolt 55, so that the baffle 53 is fixed to the outside of the welding handle 16. After the baffle 53 is installed, it can block some of the sparks from flying during the welding process.

[0067] At the start of welding, the operator presses the power switch 17. The welding current is transmitted through the internal circuitry of the welding handle 16 to the conductive core 32, and then from the conductive core 32 to the welding rod 4. An arc is generated between the end of the welding rod 4 and the workpiece, and welding begins. As welding progresses, the welding rod 4 gradually melts and shortens. The automatic welding rod feeding control system collects or receives changes in welding current and / or welding voltage. When it determines that the welding rod 4 needs to be fed, it controls the stepper motor 24 to operate. The stepper motor 24 drives the limit screw 23 to rotate, and the limit screw 23 drives the slider 21 to move along the through groove 22. The slider 21 drives the push plate 2 to move axially along the connecting pipe 18, and the push plate 2 pushes the welding rod 4 outward. During the feeding process of the welding rod 4, the limit plate 28 provides a limit to the welding rod 4, and the conductive core 32 continuously adheres to the welding rod 4 under the action of the limit spring 31, thereby ensuring that the welding rod 4 moves smoothly and conducts electricity reliably.

[0068] When the electrode 4 is fed to a point where the distance between the tip of the electrode 4 and the welding area returns to a suitable range, the control system can stop the stepper motor 24 or continue to feed at a lower speed according to a preset strategy. By repeatedly performing this process, the distance between the electrode 4 and the welding area can remain relatively stable during the welding process, thereby improving welding stability.

[0069] This invention is not limited to the specific structure described above. Various modifications can be made by those skilled in the art without departing from the core concept of this invention.

[0070] For example, the stepper motor 24 can be replaced with a servo motor, a geared motor, a micro DC motor, or other drive devices capable of driving the limit screw 23 to rotate, as needed. The stepper motor 24 is used as the preferred embodiment in the claims because it facilitates control of the rotation angle and number of rotation steps, which is beneficial for precise control of the feed amount of the welding rod 4. However, other motors combined with encoders, sensors, or control circuits can also achieve controllable feeding and can be applied to this invention.

[0071] The pitch of the limiting screw 23 can be selected according to the requirements of the feeding accuracy and feeding speed of the welding rod 4. A smaller pitch can improve the feeding resolution and make the movement of the welding rod 4 more precise; a larger pitch can increase the feeding speed and is suitable for working conditions where the welding rod 4 melts at a faster rate. The limiting screw 23 can be a common threaded rod, a trapezoidal screw, a ball screw, or other structures that can form a threaded drive with the slider 21.

[0072] The cross-sectional shape of the through groove 22 can be rectangular, square, dovetail, T-shaped, or other shapes that can restrict the rotation of the slider 21 and allow the slider 21 to slide axially. The cross-sectional shape of the slider 21 can match the through groove 22. The through groove 22 can also be set on the upper side, side, or other suitable position of the connecting pipe 18, as long as it can guide and prevent the slider 21 from rotating.

[0073] The push plate 2 can be integrally formed with the slider 21, or it can be connected separately. The side of the push plate 2 that contacts the welding rod 4 can be provided with a groove, arc surface, or anti-slip structure to improve the contact stability of the push plate 2 with the tail end of the welding rod 4. A guide bushing or wear-resistant layer can also be provided inside the connecting tube 18 to reduce the friction of the welding rod 4 and improve its service life.

[0074] The electrode clamping and limiting mechanism can be equipped with one or more limiting plates 28. For larger diameter electrodes 4, a symmetrical limiting structure on both sides can be used to further improve the clamping stability of the electrode 4. The first bolt 25 can also be replaced with an eccentric wheel, an elastic clamping block, an adjusting knob, or other adjustable clamping structure.

[0075] The conductive core 32 in the conductive clamping mechanism can be a block, sheet, column, or arc-shaped contact structure. A wear-resistant conductive layer can be provided on the surface of the conductive core 32 that contacts the welding rod 4 to improve the lifespan of the conductive core 32. The limiting spring 31 can be a compression spring, torsion spring, leaf spring, or other elastic element capable of applying an elastic clamping force to the slide 3.

[0076] The splash guard assembly can be connected using various methods such as plug-in, snap-fit, magnetic, screw, and rotary locking. The transparent, high-temperature resistant material of the guard 53 can be selected based on cost and the operating environment. The guard 53 can also be designed as an adjustable angle structure, allowing the operator to adjust the angle of the guard 53 relative to the welding handle 16 according to the welding position.

[0077] The above alternative embodiments do not depart from the core technical concept of the present invention, which realizes automatic feeding of welding rod 4 through push plate 2, slider 21, through groove 22, limit screw 23 and stepper motor 24 in connecting pipe 18, and should fall within the protection scope of the present invention.

[0078] This invention provides a manual arc welding machine with automatic electrode feeding and anti-spatter functions. A connecting pipe is provided at one end of the welding handle, and an automatic electrode feeding mechanism consisting of a push plate, a slider, a through groove, a limiting screw, and a stepper motor is set inside the connecting pipe. The stepper motor drives the limiting screw to rotate, causing the slider to move axially along the connecting pipe under the limitation of the through groove, and driving the push plate to push the electrode outward. This achieves compensation adjustment when the electrode melts and shrinks, maintaining a relatively stable distance between the electrode and the welding area.

[0079] Based on this, the present invention further improves the stability of electrode installation through an electrode clamping and limiting mechanism, ensures the conductivity reliability of the electrode during movement through an electrode voltage tightening mechanism, enables the electrode feeding action to be adjusted according to changes in welding current and / or welding voltage through an automatic electrode feeding control system, and improves the safety protection effect during welding through an anti-spatter baffle assembly.

[0080] This invention solves the problem that the continuous shortening of the welding electrode during traditional manual arc welding makes it difficult for operators to maintain a stable arc length. It reduces the reliance on manual operating experience, improves welding stability and safety, and has good application prospects.

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, combinations, or improvements made to the above embodiments within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0082] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0083] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0084] Additionally, as used herein, the "or" used in a list of items beginning with "at least one" indicates a separate list, such that a list of, for example, "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the word "exemplary" does not imply that the described example is preferred or better than other examples.

[0085] It should also be noted that in the system and method of this application, the components or steps can be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalent solutions of this application.

[0086] Various changes, substitutions, and modifications can be made to the technology described herein without departing from the teachings defined by the appended claims. Furthermore, the scope of the claims of this application is not limited to the specific aspects of the processes, machines, manufacturing, events, means, methods, and actions described above. Currently existing or later-developed processes, machines, manufacturing, events, means, methods, or actions that perform substantially the same function or achieve substantially the same result as the corresponding aspects described above can be utilized. Therefore, the appended claims include such processes, machines, manufacturing, events, means, methods, or actions within their scope.

[0087] The foregoing description of the disclosed aspects is intended to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0088] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. An electric arc welder characterized by, It includes a welding machine housing (1), a welding handle (16), a connecting pipe (18), and an automatic electrode feeding mechanism; The welding machine box (1) is provided with a positive terminal interface (13) and a negative terminal interface (14), and the positive terminal interface (13) is connected to the welding handle (16); The connecting tube (18) is disposed at one end of the welding handle (16) for accommodating the welding rod (4) and guiding the welding rod (4) to move axially along the connecting tube (18); The automatic electrode feeding mechanism includes a push plate (2), a slider (21), a through groove (22), a limiting screw (23), and a stepper motor (24); the push plate (2) is slidably disposed in the connecting pipe (18) and is used to abut one end of the electrode (4); the slider (21) is connected to the push plate (2), the through groove (22) is opened on the side of the connecting pipe (18) near the slider (21), and the slider (21) slides in cooperation with the through groove (22); the limiting screw (23) passes through the slider (21) and is threadedly engaged with the slider (21), and the limiting screw (23) is drivenly connected to the output end of the stepper motor (24); The stepper motor (24) is used to drive the limiting screw (23) to rotate, so that the slider (21) moves along the axial direction of the connecting pipe (18) under the limiting action of the through groove (22), and drives the push plate (2) to push the welding rod (4) outward.

2. The arc welder of claim 1, wherein The welding machine housing (1) is also equipped with a current adjustment knob (11), a ventilation hood (12), a positive terminal interface (13) and a negative terminal interface (14) on the outside. The negative terminal interface (14) is connected to the grounding clamp (15). A power switch (17) is provided on one side of the welding handle (16).

3. The arc welder of claim 1, wherein One end of the limiting screw (23) is movably connected to the connecting pipe (18) through a bearing, and the other end of the limiting screw (23) is fixedly connected to the output shaft of the stepper motor (24). The stepper motor (24) is fixedly mounted on the connecting pipe (18).

4. The arc welder of claim 1, wherein The through groove (22) extends along the axial direction of the connecting pipe (18), and the slider (21) matches the cross-sectional shape of the through groove (22) to restrict the slider (21) from rotating synchronously with the limiting screw (23).

5. The arc welder of claim 1, wherein The connecting pipe (18) is provided with a welding rod clamping and limiting mechanism, which includes a first bolt (25), a receiving groove (26) and a limiting plate (28). The first bolt (25) passes through the connecting pipe (18) and is threadedly connected to the connecting pipe (18); The storage groove (26) is located on the side of the connecting pipe (18) near the first bolt (25); The first bolt (25) is movably connected to the limiting plate (28) at one end near the receiving groove (26). The first bolt (25) is used to move the limiting plate (28) closer to or away from the welding rod (4).

6. The arc welding machine according to claim 5, characterized in that... The electrode clamping and limiting mechanism further includes a sliding groove (27) and a sliding rod (29). The slide groove (27) is opened on one side of the storage groove (26), the slide rod (29) slides and engages with the slide groove (27), and one end of the slide rod (29) is fixedly connected to the limiting plate (28) to limit the limiting plate (28) from shifting during movement.

7. The arc welding machine according to claim 6, characterized in that... The connecting pipe (18) is provided with a welding rod voltage tightening mechanism, which includes a slide (3), a limiting spring (31) and a conductive core (32). The slide (3) slides through the connecting pipe (18), the limiting spring (31) is sleeved on the slide (3), and the two ends of the limiting spring (31) are respectively connected to the connecting pipe (18) and the slide (3); The conductive core (32) is disposed inside the slide (3) and is used to adhere to the welding rod (4); The slide (3) moves toward the welding rod (4) under the elastic action of the limiting spring (31) so that the conductive core (32) and the welding rod (4) maintain conductive contact.

8. The arc welding machine according to claim 7, characterized in that... The push plate (2), the limiting plate (28) and / or the slide (3) are made of insulating and high-temperature resistant materials, including alumina.

9. The arc welding machine according to claim 1, characterized in that, It also includes an automatic electrode feeding control system, which is electrically connected to the stepper motor (24); The automatic electrode feeding control system is configured to collect or receive welding current and / or welding voltage during the welding process, and control the speed, direction and / or amount of rotation of the stepper motor (24) according to the changes in the welding current and / or welding voltage, so as to adjust the feeding speed and / or feeding distance of the electrode (4).

10. The arc welding machine according to claim 1, characterized in that, The welding grip (16) is provided with a splash guard assembly on its outer side; The splash guard assembly includes a retaining ring (5), a slot (51), a limiting slot (52), a baffle (53), an insert (54), and a second bolt (55); The fixing ring (5) is fixed to the outside of the welded grip (16), and the slot (51) and the limiting groove (52) are provided on the fixing ring (5); The insert (54) is fixed to the baffle (53) and is inserted into the slot (51); The second bolt (55) passes through the baffle (53) and is connected to the limiting groove (52) to detachably fix the baffle (53) to the outside of the fixing ring (5); The baffle (53) is made of transparent high-temperature resistant material and is used to block sparks generated during the welding process.

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