Efficient multi-wire gas shielded welding gun

Abstract

According to the efficient multi-wire gas shielded welding gun, three auxiliary gun bodies are integrated in a main gun body shell through a welding gun base, included angles are designed between the axes of the three auxiliary gun bodies and the axis of a main gun body, three electric arcs generated by the three auxiliary gun bodies during welding can be gathered, and welding bead separation generated under small welding parameters is effectively prevented; when the three sublance bodies ignite arcs at the same time, mutual interference among three arcs under large welding parameters is effectively reduced, and stability of the welding process is facilitated; the upper end structure of the welding gun base is designed to be of a hollow structure, circulating cooling of the three sub-gun bodies can be enhanced through external cooling water during welding, meanwhile, the three sub-gun bodies are internally provided with respective water cooling systems, and the water cooling effect of the whole gun body is remarkably improved through the cooling mode, so that large-current and large-voltage welding is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of welding and relates to welding equipment, in particular to a high-efficiency multi-wire gas shielded welding gun. Background Art

[0002] In recent years, with the development of aerospace, transportation, marine engineering and other fields, the rapid development of welding technology has been greatly promoted, and the requirements for welding quality and welding efficiency have also been rising. Gas shielded welding has the advantages of strong process adaptability, simple operation, easy mechanization and automation, and has become the preferred process for welding processing. Therefore, the development of high-quality and efficient welding processes has become a necessary task for welding workers. High-quality and efficient gas shielded welding can be achieved by increasing the number of welding wires, that is, multi-wire welding process. This process is based on double-wire gas shielded welding, and high-efficiency welding is achieved by continuing to introduce welding wires. For example, the welding speed of high-speed three-wire gas shielded welding process can reach 1.8m / min. In addition, the use of multiple welding wires can not only significantly improve welding efficiency, but also disperse the arc force acting on the molten pool, effectively avoiding the generation of welding defects, such as undercut and hump welds, which is currently one of the most effective means to achieve efficient gas shielded welding.

[0003] The prior art discloses a single power source parallel three-wire welding system, in which three welding wires are equally spaced in the welding gun head, ensuring the consistency of welding width, and is suitable for welding wires of various specifications to meet the needs of different welding processes. However, since the single power source limits the upper limit of the current, the current flowing through each welding wire is relatively reduced, resulting in a certain limitation on the improvement of the welding coverage rate. The current technology cannot accurately control the current flowing through each welding wire, which limits the precise adjustment of welding parameters. When a large current passes through the three-wire welding gun, the superior water cooling effect is not fully reflected, resulting in a shortened welding gun life when welding with large electrical parameters.

[0004] The prior art discloses an integrated ring-arranged three-electrode gas shielded welding process, in which three welding wires are arranged in an equilateral triangle and integrated into the same welding gun. In order to obtain a more concentrated welding arc and a single molten pool, the axis of each welding wire is at an angle of 7° with the axis of the welding gun body, and each welding wire is connected to an independent wire feeding mechanism and welding power supply, and its welding process parameters can be adjusted separately to meet the welding requirements. Since the axis of each welding wire is at an angle of 7° with the axis of the welding gun body, the inclination angle is large, and the arcs of the three welding wires will be excessively gathered during welding, resulting in an aggravation of the arc interference problem and affecting the welding quality. In addition, the water cooling of the welding gun is only through the water cooling system inside the welding gun, and the water cooling effect of the welding gun is poor during welding with large electrical parameters.

[0005] In the high-speed three-wire gas shielded welding new process disclosed in the prior art, three welding wires are arranged longitudinally, and each welding wire is connected to a set of wire feeding system, welding power supply and shielding gas to form an independent arc-power supply system. The welding process parameters, welding wire spacing and welding gun angle are adjustable to meet the welding requirements. In actual welding, the three welding guns are assembled on the same set of welding fixtures. However, in order to avoid strong arc interference between the three welding wires during welding, the three welding guns are only fixed with welding fixtures, so that the intervals between the three welding guns become larger, which will cause the overall welding gun size to be larger, thereby limiting the welding position. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a high-efficiency multi-wire gas shielded welding torch device to solve the problems involved in the prior art.

[0007] The technical purpose of the present invention is achieved through the following technical solutions.

[0008] A high-efficiency multi-wire gas shielded welding torch comprises a first auxiliary gun body, a second auxiliary gun body and a third auxiliary gun body arranged in a main gun body shell, and the three auxiliary gun bodies are distributed on a welding torch base along the same circumference;

[0009] The upper end of the welding gun base is divided into a hollow structure, and a mounting channel for installing three auxiliary gun bodies and penetrating the lower end of the welding gun base is arranged in the lower end structure; a first auxiliary gun body mounting hole, a second auxiliary gun body mounting hole and a third auxiliary gun body mounting hole are arranged on the upper end surface of the welding gun base, which correspond to the mounting channels of the three auxiliary gun bodies respectively; the three auxiliary gun bodies enter the upper end hollow structure of the welding base from their respective mounting holes, then enter the mounting channels corresponding to their respective mounting holes and finally extend out of the lower end structure of the welding base; a mounting hole for the water inlet pipe of the welding gun base and a mounting hole for the water outlet pipe of the welding gun base are arranged on the upper end surface of the welding gun base, which are respectively connected to the water inlet pipe of the welding gun base and the water outlet pipe of the welding gun base, and the cooling effect of the three auxiliary gun bodies is enhanced through the water inlet pipe and the water outlet pipe and by utilizing the hollow structure of the upper end of the welding base;

[0010] The three mounting holes arranged on the upper surface of the welding gun base are distributed along the same circumference, the angle between the center of the adjacent mounting holes and the center of the welding gun base is 120°, the distance L between the center of the mounting holes and the center of the welding gun base is 15-18mm; the distance D between the axes of the three auxiliary gun bodies can be regarded as the distance between any two centers of the three mounting holes is 28-35mm;

[0011] The protective gas cover is arranged at the lower end of the welding gun base, and the lower ends of the three auxiliary gun bodies are covered in the space of the protective gas cover, and the welding wires of the three auxiliary gun bodies extend out of the protective gas cover;

[0012] The first auxiliary gun body, the second auxiliary gun body and the third auxiliary gun body have the same structure, and each auxiliary gun body includes a welding gun outer tube, a welding gun outer tube seat, an air supply pipe, a water inlet pipe, a water outlet pipe, a welding gun inner tube, a conductive nozzle, a conductive nozzle base and a diverter;

[0013] A welding gun outer tube seat is arranged at the top end of the welding gun outer tube, and the welding gun inner tube, air supply pipe, water inlet pipe and water outlet pipe are all fixedly arranged in the welding gun outer tube through the welding gun outer tube seat; at the bottom end of the welding gun outer tube, the welding gun inner tube extends out of the welding gun outer tube, the upper end of the conductive nozzle base is connected to the bottom end of the welding gun inner tube extending out of the welding gun outer tube through a thread, the lower end of the conductive nozzle base is connected to the conductive nozzle through a threaded connection, and the diverter is connected to the conductive nozzle base through a threaded connection; in the welding gun outer tube, the water inlet pipe is extended to the welding gun outer tube, and the conductive nozzle base is connected to the conductive nozzle through a threaded connection. The bottom end of the inner tube of the welding gun is connected to the water outlet pipe as a whole. The cooling water is sent to the bottom end of the inner tube of the welding gun through the water inlet pipe, close to the base of the conductive nozzle, and then flows out through the water outlet pipe to realize the circulation cooling of the auxiliary gun body; in the outer tube of the welding gun, the air supply pipe is connected with the inner tube of the welding gun, and the shielding gas is sent into the inner tube of the welding gun through the air supply pipe. After flowing out from the bottom end of the inner tube of the welding gun, the shielding gas enters the base of the conductive nozzle and is discharged through the diverter, which plays a role in metallurgical protection of the welding area during welding;

[0014] The overall upper structure of the three auxiliary gun bodies is vertical and parallel to the axis of the main gun body; the lower structure of the three auxiliary gun bodies is inclined to the axis of the main gun body, and the angle α between them and the axis of the main gun body is 5-8°; the installation channels corresponding to the three auxiliary gun bodies in the welding gun base are tilted accordingly, and the upper structure of the three auxiliary gun bodies maintained in the vertical direction occupies 0.4-0.6 of the vertical length of the entire auxiliary gun body.

[0015] In the above technical solution, the three auxiliary gun bodies are tightly matched in their respective installation channels and sealed.

[0016] In the above technical solution, the protective gas hood and the lower end of the welding gun base are connected by threads.

[0017] In the above technical solution, the distance L between the center of the mounting hole and the center of the welding gun base is 17 mm.

[0018] In the above technical solution, the distance D between the axes of the three auxiliary gun bodies is 30-32 mm.

[0019] In the above technical scheme, the wire is fed directly through the inner tube of the welding gun, or a wire feeding tube is set in the inner tube of the welding gun for wire feeding. The welding wire is fed to the conductive nozzle, and the aperture of the conductive nozzle and the base of the conductive nozzle should match the diameter of the welding wire.

[0020] In the above technical solution, the lower structures of the three auxiliary gun bodies are inclined toward the axis of the main gun body, and the angle α between them and the axis of the main gun body is 6°.

[0021] In the above technical solution, the overall structure of the three auxiliary gun bodies is vertical and parallel to the axis of the main gun body. The welding gun outer tube, welding gun inner tube, wire feeding tube (if any) arranged in the welding gun inner tube, air supply pipe, and water inlet pipe and water outlet pipe are basically also kept in a vertical direction.

[0022] In the above technical solution, in the lower structure of the three auxiliary gun bodies, the outer tube and the inner tube of the welding gun are inclined toward the axis of the main gun body, and the wire feed tube (if any), air feed pipe, water inlet pipe and water outlet pipe arranged therein can be made of relatively flexible materials and bent or inclined.

[0023] In the above technical solution, the structure of the main gun body shell is an aluminum alloy cylinder, which plays a role in protecting the three auxiliary gun bodies inside. Aluminum alloy is used to reduce the weight of the entire welding gun.

[0024] In the above technical solution, three threaded holes are respectively provided at the lower end of the main gun body shell and are distributed on the same circumference. The angle between adjacent threaded holes is 120°. The welding gun base is connected to the lower end of the main gun body shell by screwing in three screws 9.

[0025] In the above technical solution, the welding gun base is divided into two parts, the upper part is a cylinder with a hollow interior, the lower part is a solid cone with installation channels for three auxiliary gun bodies, and the upper and lower parts are connected as a whole by welding.

[0026] On the basis of the above embodiment, a tail spray structure is added, including a tail spray pipe, a tail nozzle, a tail spray cover and a tail spray clamp. The tail spray clamp is arranged on the outer shell of the main gun body, and the tail spray clamp clamps the tail spray pipe. The tail spray pipe is connected to the shielding gas source. The shielding gas required during welding is delivered by the tail nozzle, which plays a metallurgical protection role in the welding area. The tail nozzle and the tail spray pipe are an integrated structure. A tail spray transition connector, such as an external thread, is selected to be arranged at a position relatively close to the tail nozzle at the bottom end of the tail spray pipe, and then the tail spray cover is connected through this tail spray transition connector. The shielding gas coming out of the tail nozzle will be gathered and concentrated by the tail spray cover to enhance the protection effect.

[0027] In the above technical solution, the tail spray structure and the main gun body shell are clamped by two fixing bolts.

[0028] In the above technical solution, the tail jet clamp is clamped by using movable bolts.

[0029] In the above technical solution, the welding gun outer tube holder and the welding gun outer tube are connected as one body by welding.

[0030] In the above technical solution, four holes corresponding to the welding gun inner tube, air supply pipe, water inlet pipe and water outlet pipe are provided on the welding gun outer tube seat, and the welding gun inner tube, air supply pipe, water inlet pipe and water outlet pipe are installed and fixed through the four holes.

[0031] Compared with the prior art, the present invention has the following beneficial effects: (1) The three auxiliary gun bodies are integrated into the same main gun body through the welding gun base, which can not only greatly improve the welding efficiency when the three auxiliary gun bodies are welded synchronously, but also the overall structure volume of the welding gun after integration is small, which is not limited by the welding position and can be welded in a small operating space, and is convenient for clamping and disassembling operations of the welding gun, so as to realize high-efficiency automatic welding. In addition, in order to reduce the weight of the entire integrated welding gun, the main gun body is made of aluminum alloy. (2) The upper end structure of the welding gun base is designed as a hollow structure, and the circulation cooling of the three auxiliary gun bodies can be enhanced by external cooling water during welding. At the same time, each of the three auxiliary gun bodies is provided with its own water cooling system. The above cooling mode significantly improves the water cooling effect of the entire gun body, thereby realizing high-current and high-voltage welding. When the three auxiliary gun bodies are welded simultaneously, the maximum preset current of each auxiliary gun body is increased from the original 200A to 230A, and the maximum preset voltage is increased from the original 28V to 33V. (3) The angle α between the axes of the three auxiliary gun bodies and the axis of the main gun body is optimized to gather the three arcs generated by the three auxiliary gun bodies during welding, effectively preventing weld separation under smaller welding parameters. In addition, the distance D between the axes of the three auxiliary gun bodies is optimized. When the three auxiliary gun bodies ignite arcs at the same time, the mutual interference between the three arcs under larger welding parameters is effectively reduced, which helps to stabilize the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the welding gun of the present invention (1).

[0033] Figure 2 It is a schematic diagram of the welding gun of the present invention (2).

[0034] Figure 3 Schematic diagram (1) of the first auxiliary gun body in the welding gun of the present invention.

[0035] Figure 4 It is a schematic diagram (2) of the first auxiliary gun body in the welding gun of the present invention.

[0036] Figure 5 It is a schematic structural diagram of three auxiliary gun bodies in the welding gun of the present invention distributed on the welding gun base.

[0037] Figure 6 It is a schematic diagram of the relationship between the axes of the first and second auxiliary gun bodies and the main gun body in the welding gun of the present invention.

[0038] Figure 7 It is a schematic diagram of the bottom structure of the auxiliary gun body in the welding gun of the present invention.

[0039] In the figure: 1 is the main gun body shell, 2 is the first auxiliary gun body, 2-1 is the first auxiliary gun body mounting hole, 3 is the second auxiliary gun body, 3-1 is the second auxiliary gun body mounting hole, 4 is the third auxiliary gun body, 4-1 is the third auxiliary gun body mounting hole, 5 is the welding gun base, 6 is the protective gas cover, 7 is the welding gun base water inlet pipe, 7-1 is the mounting hole of the welding gun base water inlet pipe, 8 is the welding gun base water outlet pipe, 8-1 is the mounting hole of the welding gun base water outlet pipe, 9-screw, 10-tail jet pipe, 11-tail nozzle, 12-tail jet transition connector, 13-tail jet cover, 14-tail jet clamp, 15-fixing bolt, 16-movable bolt, 17 is welding gun outer tube, 18 is welding gun outer tube seat, 19 is air supply pipe, 20 is water inlet pipe, 21 is water outlet pipe, 22 is welding gun inner tube, 23 is conductive nozzle, 24 is conductive nozzle base, 25 is diverter, 26 is welding wire, α is the angle between the auxiliary gun body and the axis of the main gun body.

[0040] Figure 8 The high-speed photographs are taken when the welding gun of the present invention is used for welding at a current of 120A and a voltage of 20V.

[0041] Fig. 9 The following is a photo of the weld formation after welding using the welding gun of the present invention at a current of 120A and a voltage of 20V.

[0042] Fig.10 The high-speed photographs are taken when the welding gun of the present invention is used for welding at a current of 230A and a voltage of 33V.

[0043] Fig.11 The following is a photo of weld formation using the welding gun of the present invention at a current of 230A and a voltage of 33V.

[0044] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0045] The technical solution of the present invention is further described below in conjunction with specific embodiments and drawings.

[0046] As attached Figure 1 —4, Figure 1 The overall structure of the welding gun is shown after removing the main gun body shell 1, the protective gas cover 6 and the tail spray cover 13. Figure 2 As shown in the overall structure, the high-efficiency multi-wire gas shielded welding gun of this embodiment has a first auxiliary gun body 2, a second auxiliary gun body 3 and a third auxiliary gun body 4 arranged in a main gun body shell 1, and the three auxiliary gun bodies are distributed on a welding gun base 5 along the same circumference;

[0047] by Figure 1—3, the vertical upward direction is the upper end of each component, and the vertical downward direction is the lower end of each component. In this sense, the upper end of the welding gun base is divided into a hollow structure, and a mounting channel for mounting three auxiliary gun bodies and penetrating the lower end of the welding gun base is provided in the lower end structure; three circular holes are provided on the upper end surface of the welding gun base, such as Figure 5 As shown, the first auxiliary gun body mounting hole, the second auxiliary gun body mounting hole and the third auxiliary gun body mounting hole correspond to the mounting channels of the three auxiliary gun bodies respectively. Taking the first auxiliary gun body 2 as an example, during installation, the first auxiliary gun body 2 passes through the upper hollow structure of the welding base from the first auxiliary gun body mounting hole 2-1, then enters the mounting channel corresponding to the first auxiliary gun body mounting hole 2-1 and finally extends out of the lower structure of the welding base; the mounting hole of the welding gun base water inlet pipe and the mounting hole of the welding gun base water outlet pipe are set on the upper surface of the welding gun base, which are respectively connected to the welding gun base water inlet pipe and the welding gun base water outlet pipe, and the cooling effect of the three auxiliary gun bodies is enhanced through the water inlet pipe and the water outlet pipe and the upper hollow structure of the welding base. In this way, the three auxiliary gun bodies are required to fit tightly in their respective mounting channels and implement conventional sealing treatment.

[0048] like Figure 5 As shown, three circular holes are arranged on the upper surface of the welding gun base, distributed along the same circumference, the angle between the centers of adjacent circular holes and the connecting line of the centers of the welding gun base is 120°, and the distance L between the centers of the circular holes and the centers of the welding gun base is 15-18 mm, preferably 17 mm. The distance D between the axes of the three auxiliary gun bodies can be regarded as the distance between any two centers of the three circular holes is 28-35 mm, preferably 30-32 mm.

[0049] like Figure 1 As shown in FIG. 2 , a protective gas hood is arranged at the lower end of the welding gun base (such as the two are connected by threads), the lower ends of the three auxiliary gun bodies are covered in the space of the protective gas hood, and the welding wires of the three auxiliary gun bodies extend out of the protective gas hood.

[0050] like Figure 3 , Figure 4 and 7 As shown, the structures of the first auxiliary gun body 2, the second auxiliary gun body 3 and the third auxiliary gun body 4 are consistent. Taking the first auxiliary gun body 2 as an example, it includes a welding gun outer tube 17, a welding gun outer tube seat 18, an air supply pipe 19, a water inlet pipe 20, a water outlet pipe 21, a welding gun inner tube 22, a conductive nozzle 23, a conductive nozzle base 24 and a diverter 25;

[0051] A welding gun outer tube seat is arranged at the top of the welding gun outer tube, and the welding gun inner tube, air supply pipe, water inlet pipe and water outlet pipe are all fixedly arranged in the welding gun outer tube through the welding gun outer tube seat; at the bottom end of the welding gun outer tube, the welding gun inner tube extends out of the welding gun outer tube, the upper end of the conductive nozzle base is connected to the bottom end of the welding gun inner tube extending out of the welding gun outer tube through a thread, the lower end of the conductive nozzle base is connected to the conductive nozzle through a threaded connection, and the diverter is connected to the conductive nozzle base through a threaded connection; in the welding gun outer tube, the water inlet pipe is extended to the bottom end of the welding gun inner tube, and then connected to the outlet pipe. The water pipes are connected as one, and the cooling water can be sent to the bottom end of the inner tube of the welding gun through the water inlet pipe 1, so as to be close to the base of the conductive nozzle, and then flow out through the water outlet pipe to realize the circulation cooling of the first auxiliary gun body; in the outer tube of the welding gun, the air supply pipe is connected with the inner tube of the welding gun, that is, there is a connection between the two. In this way, the shielding gas can be sent into the inner tube of the welding gun through the air supply pipe, and then after flowing out from the bottom end of the inner tube of the welding gun, the shielding gas enters the base of the conductive nozzle and is discharged through the diverter, which plays a role in metallurgical protection of the welding area during welding.

[0052] You can choose to use the inner tube of the welding gun to feed the wire directly, or set a wire feeding tube in the inner tube of the welding gun to feed the wire. Both methods will feed the welding wire to the conductive nozzle. The aperture of the conductive nozzle and the base of the conductive nozzle should match the diameter of the welding wire.

[0053] like Figure 6 As shown, the overall upper structure of the three auxiliary gun bodies is vertical and parallel to the axis of the main gun body. The welding gun outer tube, welding gun inner tube, wire feed tube (if any), air supply tube, water inlet pipe and water outlet pipe are basically vertical. The lower structure of the three auxiliary gun bodies is inclined toward the axis of the main gun body. The angle α between the three auxiliary gun bodies and the axis of the main gun body is 5-8°, preferably 6°. This can gather the three arcs generated by the three auxiliary gun bodies during welding and effectively prevent weld separation under smaller welding parameters. It should be noted that in the lower structure of the three auxiliary gun bodies, the welding gun outer tube and welding gun inner tube are inclined toward the axis of the main gun body, and the wire feed tube (if any), air supply tube, water inlet pipe and water outlet pipe arranged therein can be bent or tilted by relatively flexible materials. In order to cooperate with the setting of tilting toward the axis of the main gun body, the installation channels corresponding to the three auxiliary gun bodies in the welding gun base need to be tilted accordingly to meet the design requirements. Figure 6 Judging from the display direction, the upper structure of the three auxiliary gun bodies maintained in the vertical direction accounts for 0.4-0.6 of the vertical length of the entire auxiliary gun body.

[0054] In the above technical solution, the structure of the main gun body shell is an aluminum alloy cylinder, which plays a role in protecting the three auxiliary gun bodies inside. Aluminum alloy is used to reduce the weight of the entire welding gun.

[0055] In the above technical solution, three threaded holes are respectively provided at the lower end of the main gun body shell and are distributed on the same circumference. The angle between adjacent threaded holes is 120°. The welding gun base is connected to the lower end of the main gun body shell by screwing in three screws 9.

[0056] In the above technical solution, the welding gun base is divided into two parts, the upper part is a cylinder with a hollow interior, the lower part is a solid cone with installation channels for three auxiliary gun bodies, and the upper and lower parts are connected as a whole by welding.

[0057] On the basis of the above embodiments, according to the use environment and process requirements of the welding gun, consider adding a tail spray structure, including a tail spray pipe, a tail nozzle, a tail spray cover and a tail spray clamp. The tail spray clamp is arranged on the main gun body shell, such as by two fixing bolts 15 to achieve the clamping of the tail spray structure and the main gun body shell, and the tail spray clamp clamps the tail spray pipe, such as by using a movable bolt 16. The tail spray pipe is connected to the shielding gas source, and the shielding gas required during welding is delivered by the tail nozzle, which plays a metallurgical protection role in the welding area; the tail nozzle 11 and the tail spray pipe 10 are an integrated structure, and a tail spray transition connector, such as an external thread, is selected at a position relatively close to the tail nozzle 11 at the bottom end of the tail spray pipe, and then connected to the tail spray cover through this tail spray transition connector. The shielding gas coming out of the tail nozzle will be gathered and concentrated by the tail spray cover to enhance the protection effect.

[0058] In the above technical solution, the welding gun outer tube holder and the welding gun outer tube are connected as one body by welding.

[0059] In the above technical solution, four holes corresponding to the welding gun inner tube, air supply pipe, water inlet pipe and water outlet pipe are provided on the welding gun outer tube seat, and the welding gun inner tube, air supply pipe, water inlet pipe and water outlet pipe are installed and fixed through the four holes.

[0060] like Figure 5 As shown in the figure, the three circular holes set on the upper surface of the welding gun base are distributed along the same circumference, the angle between the centers of adjacent circular holes and the center of the welding gun base is 120°, and the distance L between the centers of the circular holes and the center of the welding gun base is 17mm. The distance D between the axes of the three auxiliary gun bodies can be regarded as the distance between any two centers of the three circular holes is 30mm. Figure 6 As shown in the figure, the three auxiliary gun bodies are vertically oriented and parallel to the axis of the main gun body. The angle between the axis of the three auxiliary gun bodies and the axis of the main gun body is designed to be 6°. When welding with this welding gun, the welding conditions are 120A and 20V. Figure 8 and 9 At this time, the arc condition of the whole welding process is good, and the weld formed is straight and complete, which shows that this welding gun can weld under low voltage and low current. Increase the current to 230A and the voltage to 33V. Fig.10 and 11 As shown. At this time, the arc of the entire welding process is still within the controllable range, and a relatively qualified weld can be formed. In other words, the welding gun of the present invention can adapt to the voltage and current range from low to high, and the maximum preset current of each auxiliary gun body is increased from the original 200A to 230A, and the maximum preset voltage is increased from the original 28V to 33V, that is, the current and voltage values ​​are adjusted within the range of the maximum preset current and voltage, so as to increase the adjustment range of the welding process parameters and be applicable to more welding process occasions.

[0061] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to illustrate the relationship of an element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "on" other elements or features. Therefore, the exemplary term "lower" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or located in other orientations), and the spatial relative description used here can be interpreted accordingly. Moreover, relational terms such as "first" and "second" are only used to distinguish one from another component with the same name, and do not necessarily require or imply that there is any such actual relationship or order between these components.

[0062] The present invention is described above by way of example. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by those skilled in the art without inventive effort falls within the protection scope of the present invention.

Claims

1. A high-efficiency multi-wire gas shielded welding gun, characterized in that: A first auxiliary gun body, a second auxiliary gun body and a third auxiliary gun body are arranged in the main gun body shell, and the three auxiliary gun bodies are distributed on the welding gun base along the same circumference; The upper end of the welding gun base is divided into a hollow structure, and a mounting channel for installing three auxiliary gun bodies and penetrating the lower end of the welding gun base is arranged in the lower end structure; a first auxiliary gun body mounting hole, a second auxiliary gun body mounting hole and a third auxiliary gun body mounting hole are arranged on the upper end surface of the welding gun base, which correspond to the mounting channels of the three auxiliary gun bodies respectively; the three auxiliary gun bodies enter the upper end hollow structure of the welding base from the root mounting hole, and then enter the mounting channels corresponding to their respective mounting holes and finally extend out of the lower end structure of the welding base; a mounting hole for the welding gun base water inlet pipe and a mounting hole for the welding gun base water outlet pipe are arranged on the upper end surface of the welding gun base, which are respectively connected to the welding gun base water inlet pipe and the welding gun base water outlet pipe, and the cooling effect of the three auxiliary gun bodies is enhanced through the water inlet pipe and the water outlet pipe and by utilizing the upper end hollow structure of the welding base; The three mounting holes arranged on the upper surface of the welding gun base are distributed along the same circumference, the angle between the center of the adjacent mounting holes and the center of the welding gun base is 120°, and the distance between the center of the mounting holes and the center of the welding gun base is 15-18mm; the distance between the axes of the three auxiliary gun bodies is 28-35mm; the protective gas cover is arranged at the lower end of the welding gun base, and the lower ends of the three auxiliary gun bodies are covered in the space of the protective gas cover, and the welding wires of the three auxiliary gun bodies extend out of the protective gas cover; The first auxiliary gun body, the second auxiliary gun body and the third auxiliary gun body have the same structure, and each auxiliary gun body includes a welding gun outer tube, a welding gun outer tube seat, an air supply pipe, a water inlet pipe, a water outlet pipe, a welding gun inner tube, a conductive nozzle, a conductive nozzle base and a diverter; A welding gun outer tube seat is arranged at the top end of the welding gun outer tube, and the welding gun inner tube, air supply pipe, water inlet pipe and water outlet pipe are all fixedly arranged in the welding gun outer tube through the welding gun outer tube seat; at the bottom end of the welding gun outer tube, the welding gun inner tube extends out of the welding gun outer tube, the upper end of the conductive nozzle base is connected to the bottom end of the welding gun inner tube extending out of the welding gun outer tube through a thread, the lower end of the conductive nozzle base is connected to the conductive nozzle through a threaded connection, and the diverter is connected to the conductive nozzle base through a threaded connection; in the welding gun outer tube, the water inlet pipe is extended to the welding gun outer tube, and the conductive nozzle base is connected to the conductive nozzle through a threaded connection. The bottom end of the inner tube of the welding gun is connected to the water outlet pipe as a whole. The cooling water is sent to the bottom end of the inner tube of the welding gun through the water inlet pipe, close to the base of the conductive nozzle, and then flows out through the water outlet pipe to realize the circulation cooling of the auxiliary gun body; in the outer tube of the welding gun, the air supply pipe is connected with the inner tube of the welding gun, and the shielding gas is sent into the inner tube of the welding gun through the air supply pipe. After flowing out from the bottom end of the inner tube of the welding gun, the shielding gas enters the base of the conductive nozzle and is discharged through the diverter, which plays a role in metallurgical protection of the welding area during welding; The overall upper structure of the three auxiliary gun bodies is vertical and parallel to the axis of the main gun body; the lower structure of the three auxiliary gun bodies is inclined to the axis of the main gun body, and the angle α between them and the axis of the main gun body is 5-8°; the installation channels corresponding to the three auxiliary gun bodies in the welding gun base are tilted accordingly, and the upper structure of the three auxiliary gun bodies maintained in the vertical direction occupies 0.4-0.6 of the vertical length of the entire auxiliary gun body.

2. A high-efficiency multi-wire gas shielded welding torch according to claim 1, characterized in that: The high-efficiency multi-wire gas shielded welding gun also includes a tail spray structure, including a tail spray pipe, a tail nozzle, a tail spray cover and a tail spray clamp. The tail spray clamp is arranged on the outer shell of the main gun body, and the tail spray clamp clamps the tail spray pipe. The tail spray pipe is connected to the shielding gas source. The shielding gas during the welding process is delivered by the tail nozzle, which plays a metallurgical protection role on the welding area. The tail nozzle and the tail spray pipe are an integrated structure. A tail spray transition connector is arranged at a position relatively close to the tail nozzle at the bottom end of the tail spray pipe, and then the tail spray cover is connected through this tail spray transition connector. The shielding gas coming out of the tail nozzle will be gathered and concentrated by the tail spray cover to enhance the protection effect.

3. A high-efficiency multi-wire gas shielded welding torch according to claim 1 or 2, characterized in that: The welding gun base is divided into two parts, the upper part is a cylinder with a hollow interior, and the lower part is a solid frustum with installation channels for three auxiliary gun bodies. The upper and lower parts are connected as a whole by welding.

4. The high-efficiency multi-wire gas shielded welding torch according to claim 1, characterized in that: The three auxiliary gun bodies are tightly matched in their respective installation channels and are sealed.

5. A high-efficiency multi-wire gas shielded welding torch according to claim 1 or 2, characterized in that: The distance between the center of the mounting hole and the center of the welding gun base is 17mm, the distance between the axes of the three auxiliary gun bodies is 30-32mm, and the lower structure of the three auxiliary gun bodies is inclined toward the axis of the main gun body, and the angle α between them and the axis of the main gun body is 6°.

6. The high-efficiency multi-wire gas shielded welding torch according to claim 1, characterized in that: The lower end of the main gun body shell is respectively provided with three threaded holes, which are distributed on the same circumference, and the angle between adjacent threaded holes is 120°. The welding gun base is connected to the lower end of the main gun body shell by screwing in three screws 9.

7. The high-efficiency multi-wire gas shielded welding torch according to claim 2, characterized in that: The tail nozzle structure and the main gun body shell are clamped by two fixing bolts, and the tail nozzle clamp is clamped by a movable bolt. The tail nozzle transition connector is an external thread.

8. The high-efficiency multi-wire gas shielded welding torch according to claim 1, characterized in that: The structure of the main gun body shell is an aluminum alloy cylindrical tube, and the protective gas hood and the lower end of the welding gun base are connected by threads; the wire is fed directly through the inner tube of the welding gun, or a wire feeding tube is set in the inner tube of the welding gun for wire feeding, both of which feed the welding wire to the conductive nozzle. The aperture of the conductive nozzle and the conductive nozzle base should match the diameter of the welding wire.

9. The high-efficiency multi-wire gas shielded welding torch according to claim 1, characterized in that: The welding gun outer tube holder is connected to the welding gun outer tube as a whole by welding. In the above technical scheme, the welding gun outer tube holder is provided with four holes corresponding to the welding gun inner tube, air supply pipe, water inlet pipe and water outlet pipe, and the welding gun inner tube, air supply pipe, water inlet pipe and water outlet pipe are installed and fixed through the four holes.

10. The high-efficiency multi-wire gas shielded welding torch according to claim 1, characterized in that: The overall upper structures of the three auxiliary gun bodies are in a vertical direction and parallel to the axis of the main gun body; the lower structures of the three auxiliary gun bodies can be made of relatively flexible materials to be bent or tilted.

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