Narrow-gap thick plate welding protective sleeve device based on rotating arc and using method

Abstract

The invention discloses a narrow-gap thick plate welding protective sleeve device based on rotating arcs and a using method, and relates to the technical field of welding equipment.The device comprises an inner-layer protection assembly installed on the outer side of a welding gun nozzle, and an outer-layer protection sleeve matched with the inner-layer protection assembly is arranged on the outer side of the bottom of the inner-layer protection assembly; the bottom end of the outer-layer protective sleeve is symmetrically provided with base materials matched with the outer-layer protective sleeve, and a narrow weld bead matched with the inner-layer protective assembly is arranged between the two sets of base materials. A connecting pipe is arranged at the bottom end of the welding gun nozzle, a contact tube is arranged at the bottom end of the connecting pipe, and a cable type welding wire penetrating through the welding gun nozzle and the connecting pipe is arranged in the contact tube in a penetrating mode. The outer protection sleeve is arranged on the outer side of the bottom of the inner protection assembly, so that the outer protection sleeve is lapped on the surfaces of two sets of base metal during welding, protection gas cannot leak on the surfaces of the two sets of base metal and at a groove, meanwhile, the protection gas can be completely blown into a molten pool of a narrow weld bead, and the quality of a weld joint is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of welding equipment, and in particular to a narrow gap thick plate welding protective sleeve device based on a rotating arc and a use method thereof. Background Art

[0002] In many fields such as aerospace, large-scale infrastructure, and marine equipment, welding technology is required to complete the assembly of various workpieces. Welding is divided into two categories: fusion welding and pressure welding. Fusion welding is the most important welding method in the world and is used in various industrial fields. In fusion welding, gas shielded welding accounts for a large proportion. During gas shielded welding, the welding wire needs to be melted, and at the same time, inert gas needs to be sprayed from the welding gun to protect the molten pool to prevent oxidation, pores, cracks and other defects in the molten pool at high temperatures. At the same time, the weldment needs to be grooved at different angles to ensure that the weld can be perfectly integrated and the gas protection is more sufficient. Usually, submerged arc welding is used to weld thick plates. Submerged arc welding equipment It is bulky, the welding position is limited, and it is not as small and flexible as gas shielded welding. When submerged arc welding thick plates, the base material needs to have a double V-shaped groove, which will waste the base material and welding wire, and the welding efficiency will decrease. Usually, it takes about 20 weld layers to weld a 50mm plate. If you use narrow gap thick plate welding without grooves, although only 10 weld layers are needed to fill it, it will cause the ordinary welding gun to be unable to reach the weld (the welding gun protective cover is blocked by the weldment). At the same time, a large part of the shielding gas sent from the welding gun is blocked by the surface of the weldment, and it cannot completely protect the molten pool, which will cause a large number of pores and cracks in the weld, resulting in the weldment failing the flaw detection.

[0003] Therefore, Chinese patent CN220217043U discloses a narrow gap gas shielded welding gun, including a conductive structure and a nozzle structure, wherein the conductive structure includes a conductive connecting part with a wire feeding channel, a conductive rod and a conductive nozzle, and the conductive rod is radially provided with a gas channel for outputting shielding gas; the nozzle structure is sleeved outside the conductive structure, and the nozzle structure is made of high temperature resistant insulating material, including a first nozzle part connected to the conductive connecting part through an adapter at one end and a second nozzle part connected to the other end of the first nozzle part, the second nozzle part is arranged as a flat structure, and the first nozzle part and the second nozzle part are axially provided with a first gas supply channel for conveying shielding gas, and the gas channel is connected to the first gas supply channel after installation; the two outer side surfaces of the second nozzle part arranged in the width direction are arranged as a plane structure parallel to each other, and the distance between the two outer side surfaces of the second nozzle part arranged in the length direction is greater than the distance between the two side surfaces of the second nozzle part arranged in the width direction; the narrow gap gas shielded welding gun solves the technical problems that the existing narrow gap gas shielded welding gun is difficult to complete the large thickness narrow gap groove welding operation, and the welding gun is easy to short-circuit during welding. However, the second nozzle part of this narrow gap gas shielded welding gun is a flat closed structure. Due to the small shielding gas outlet of this structure, the spatter generated during welding can easily block the gas outlet of the second nozzle part, resulting in poor gas protection and affecting the welding quality. The nozzle part needs to be frequently cleaned for slag. Excessive cleaning times will cause the nozzle part to be easily deformed, and it is easy to knock against the side wall of the base material when welding narrow gap thick plates, resulting in unstable welding.

[0004] Similarly, Chinese patent CN116833524A discloses a consumable gas shielded welding narrow gap thick plate welding gun, including a conductive structure, a nozzle structure and a gas support structure, the conductive structure including a conductive nozzle provided with a wire feeding channel; the nozzle structure is made of high temperature resistant insulating material, sleeved outside the conductive structure, including a first nozzle part and a second nozzle part connected to the first nozzle part, the second nozzle part is arranged as a flat structure, the first nozzle part and the second nozzle part are provided with a first gas supply channel for conveying shielding gas along their axial direction, after installation, the conductive nozzle passes through the first nozzle part and the second nozzle part in sequence, and extends out of the second nozzle part; the gas support structure includes at least one anti-collision column, the anti-collision column is arranged on the side of the second nozzle part along the length direction, and a second gas supply channel for conveying shielding gas is provided in the anti-collision column along its axial direction, and the output direction of the second gas supply channel is consistent with that of the first gas supply channel; the consumable gas shielded welding narrow gap thick plate welding gun can be suitable for narrow gap thick plate welding operations of thick materials, and has strong reliability, high safety and good stability, which greatly improves the welding quality and efficiency. However, the special protective cover equipped with the MIG / MAG welding gun for narrow gap thick plate welding is also easily blocked or deformed by welding spatter. At the same time, due to the flat structure, it is impossible to ensure that the shielding gas uniformly protects the molten pool when welding the cover layer.

[0005] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0006] In view of the problems in the related art, the present invention proposes a narrow gap thick plate welding protective cover device based on a rotating arc and a use method to overcome the above-mentioned technical problems existing in the existing related art.

[0007] To this end, the specific technical solution adopted by the present invention is as follows:

[0008] According to one aspect of the present invention, a narrow gap thick plate welding protective cover device based on a rotating arc is provided, including an inner layer protection assembly installed on the outside of a welding gun nozzle, characterized in that an outer layer protection cover matching with the inner layer protection assembly is arranged on the outside of the bottom of the inner layer protection assembly, a base material matching with the outer layer protection cover is symmetrically arranged on the bottom end of the outer layer protection cover, and a narrow gap weld matching with the inner layer protection assembly is arranged between the two groups of base materials; a connecting pipe is arranged at the bottom end of the welding gun nozzle, a conductive nozzle is arranged at the bottom end of the connecting pipe, and a cable-type welding wire penetrating the welding gun nozzle and the connecting pipe is arranged inside the conductive nozzle.

[0009] Furthermore, the inner protective assembly includes an inner protective sleeve arranged outside the welding gun nozzle, the bottom of the inner protective sleeve is symmetrically provided with grooves matching the narrow weld, and the bottom end of the inner protective sleeve is symmetrically provided with a support platform matching the outer protective sleeve.

[0010] Furthermore, the outer protective cover is a hollow cylindrical structure, and the height of the inner protective cover is greater than the height of the outer protective cover.

[0011] Furthermore, the width of the narrow weld is smaller than the inner diameter of the outer protective sleeve.

[0012] Furthermore, the height of the groove is less than or equal to the height of the outer protective cover.

[0013] Further, the support platform is located between the two sets of grooves.

[0014] Furthermore, the width of the supporting platform is greater than the thickness of the outer protective cover.

[0015] Furthermore, the length of the support platform is smaller than the width of the narrow weld bead.

[0016] Further, the contact tip is located inside the narrow weld bead.

[0017] According to another aspect of the present invention, a method for using a narrow gap thick plate welding protective cover device based on a rotating arc is provided, the method comprising the following steps:

[0018] S1. Put the outer protective sleeve on the outer side of the inner protective assembly, and then install the inner protective assembly on the outer side of the welding gun nozzle;

[0019] S2, based on the pre-preparation of two groups of base materials, a narrow weld is set between the two groups of base materials;

[0020] S3. Use the pre-prepared welding vehicle to move the conductive nozzle and the inner protective assembly into the narrow weld for welding. At the same time, the outer protective cover will be blocked by the two sets of base materials outside the narrow weld for welding protection.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention arranges an outer protective cover on the outer side of the bottom of the inner protective assembly so that the outer protective cover is placed on the surfaces of two groups of parent materials during welding, so that the protective gas will not leak on the surfaces of the two groups of parent materials and at the groove, and can be completely blown into the molten pool of the narrow weld to ensure the quality of the weld; and under the action of the groove, the inner protective cover can be extended into the narrow weld, thereby ensuring that the inner protective cover can move freely in the narrow weld, thereby ensuring that the outer protective cover is always in contact with the surfaces of the two groups of parent materials, ensuring the continuity of welding protection.

[0023] 2. The present invention greatly reduces the loss of base material and cable welding wire and the number of welding layers through narrow welds, which can greatly improve the welding efficiency of thick plates and reduce the cost of production and manufacturing; and through the combined design of the inner layer protection component and the outer layer protection cover, it is convenient to directly disassemble and replace the protection cover on the welding gun, saving the maintenance cost of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is one of the structural schematic diagrams of a narrow gap thick plate welding protective cover device based on a rotating arc according to an embodiment of the present invention in practical application;

[0026] Figure 2 This is the second structural schematic diagram of the narrow gap thick plate welding protective cover device based on rotating arc in practical application according to an embodiment of the present invention;

[0027] Figure 3 It is one of the partial cross-sectional views of the narrow gap thick plate welding protective cover device based on rotating arc according to an embodiment of the present invention in practical application;

[0028] Figure 4 This is a second partial cross-sectional view of a narrow gap thick plate welding protective cover device based on a rotating arc according to an embodiment of the present invention in practical application;

[0029] Figure 5 is a schematic structural diagram of a narrow gap thick plate welding protective cover device based on a rotating arc according to an embodiment of the present invention in an actual cap welding application;

[0030] Figure 6 The present invention is a flowchart of a method for using a narrow gap thick plate welding protective cover device based on a rotating arc according to an embodiment of the present invention.

[0031] In the figure:

[0032] 1. Outer protective cover; 2. Inner protective assembly; 201. Inner protective cover; 202. Bevel; 203. Support platform; 3. Conductive nozzle; 4. Connecting pipe; 5. Welding gun nozzle; 6. Base material; 7. Cable welding wire; 8. Narrow weld. DETAILED DESCRIPTION

[0033] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0034] According to an embodiment of the present invention, a narrow gap thick plate welding protective sleeve device based on a rotating arc and a use method thereof are provided.

[0035] The present invention is further described with reference to the accompanying drawings and specific embodiments. Figure 1-Figure 5 As shown, according to one embodiment of the present invention, a narrow gap thick plate welding protective cover device based on a rotating arc is provided, including an inner layer protection component 2 installed on the outside of a welding gun nozzle 5, characterized in that an outer layer protection cover 1 matching with the inner layer protection component 2 is arranged on the outside of the bottom of the inner layer protection component 2, a base material 6 matching with the outer layer protection cover 1 is symmetrically arranged on the bottom end of the outer layer protection cover 1, and a narrow gap weld 8 matching with the inner layer protection component 2 is arranged between the two groups of base materials 6; a connecting pipe 4 is arranged at the bottom end of the welding gun nozzle 5, a conductive nozzle 3 is arranged at the bottom end of the connecting pipe 4, and a cable welding wire 7 penetrating the welding gun nozzle 5 and the connecting pipe 4 is arranged inside the conductive nozzle 3.

[0036] It should be noted that the inner layer protection component 2 and the outer layer protection cover 1 can both be made of copper material, and can be used for the cable welding wire 7 by metal-metal gas shielded welding; at this time, the inner walls of the inner layer protection component 2 and the outer layer protection cover 1 need to be embedded with insulating gaskets to prevent the inner layer protection component 2 and the outer layer protection cover 1 from contacting with the base material 6 during the welding process, thereby causing short circuit and sparking; the inner layer protection component 2 and the outer layer protection cover 1 can also be made of ceramic material, which is generally used for tungsten electrode gas shielded welding; according to the actual situation at the welding site, a combination of a copper inner layer protection component 2 and a ceramic outer layer protection cover 1 or a combination of a copper outer layer protection cover 1 and a ceramic inner layer protection component 2 can also be used to carry out cable welding of thick plates with narrow gaps with the welding wire 7.

[0037] It should be noted that the welding gun nozzle 5 and the inner layer protection component 2 are threaded or plug-in, that is, the connection method between the inner layer protection component 2 and the welding gun is threaded or plug-in; the inner layer protection component 2 of corresponding size and interface form can be selected according to the original connection method of the welding gun protective cover.

[0038] Specifically, the inner protective assembly 2 includes an inner protective sleeve 201 arranged on the outside of the welding gun nozzle 5, and the bottom of the inner protective sleeve 201 is symmetrically provided with a groove 202 that matches the narrow weld 8, and the bottom end of the inner protective sleeve 201 is symmetrically provided with a support platform 203 that matches the outer protective sleeve 1.

[0039] It should be noted that the two sets of grooves 202 opened on the inner protective sleeve 201 are specifically cut symmetrically along the longitudinal direction of the air outlet based on the cylindrical structure of the inner protective sleeve 201, so that the inner protective sleeve 201 can extend into the narrow weld 8, that is, into the narrow gap weld; the size of the inner protective sleeve 201 is based on the required welding plate thickness and the size of the adapted welding gun, that is, the size of the parent material 6 and the welding gun. The length of the inner protective sleeve 201 is specifically between 100mm-250mm, the inner diameter of the inner protective sleeve 201 is adapted to the outer diameter of the welding gun connecting rod, that is, the inner diameter of the inner protective sleeve 201 is adapted to the outer diameter of the welding gun nozzle 5, and the wall thickness of the inner protective sleeve 201 is specifically 2.5mm; according to the thickness of the parent material 6 and the width of the narrow weld 8, the size of the groove 202 cut longitudinally of the inner protective sleeve 201 along the air outlet is specifically between 50mm-150mm, and the size of the groove 202 cut transversely at the air outlet is between 5mm-15mm.

[0040] It should be noted that the support platform 203 at the bottom end of the inner protective assembly 2 is specifically two symmetrical outwardly protruding platforms arranged at the lower end of the air outlet of the inner protective cover 201, which can prevent the outer protective cover 1 from falling off from the inner protective cover 201.

[0041] Specifically, the outer protective cover 1 is a hollow cylindrical structure, and the height of the inner protective cover 201 is greater than the height of the outer protective cover 1 .

[0042] Specifically, the width of the narrow weld bead 8 is smaller than the inner diameter of the outer protective sheath 1 .

[0043] Specifically, the height of the groove 202 is less than or equal to the height of the outer protective cover 1 .

[0044] It should be noted that the outer protective sleeve 1 is in the shape of a hollow cylindrical structure. The length of the outer protective sleeve 1 is generally set to between 60mm and 160mm according to the longitudinal length of the symmetrical groove 202 of the inner protective sleeve 201. The inner diameter of the outer protective sleeve 1 matches the outer diameter of the inner protective sleeve 201, and the wall thickness of the outer protective sleeve 1 is 2.5mm; there is a clearance fit between the outer protective sleeve 1 and the inner protective sleeve 201, and the assembly clearance between the outer protective sleeve 1 and the inner protective sleeve 201 is 0.5-1.0mm; during welding, the outer protective sleeve 1 can move vertically along the direction of the inner protective sleeve 201; the outer protective sleeve 1 is placed on the upper surface of the weldment during welding, that is, the outer protective sleeve 1 is placed on the upper surface of the base material 6 during welding to prevent the shielding gas from overflowing from the weldment surface and the groove 202 on the inner protective sleeve 201, so that the shielding gas is completely blown toward the molten pool to protect the weld and avoid the formation of pores and cracks.

[0045] Specifically, the support platform 203 is located between the two groups of grooves 202 .

[0046] Specifically, the width of the supporting platform 203 is greater than the thickness of the outer protective cover 1 .

[0047] Specifically, the length of the support platform 203 is smaller than the width of the narrow weld bead 8 .

[0048] Specifically, the conductive tip 3 is located inside the narrow weld bead 8 .

[0049] like Figure 6 As shown, according to another embodiment of the present invention, a method for using a narrow gap thick plate welding protective cover device based on a rotating arc is provided, and the method comprises the following steps:

[0050] S1, put the outer protective sleeve 1 on the outer side of the inner protective assembly 2, and then install the inner protective assembly 2 on the outer side of the welding gun nozzle 5;

[0051] S2, based on the pre-preparation of two groups of base materials 6, a narrow weld bead 8 is provided between the two groups of base materials 6;

[0052] S3. Move the conductive nozzle 3 and the inner protective assembly 2 into the narrow weld bead 8 for welding through the pre-prepared welding vehicle. Meanwhile, the outer protective sleeve 1 is blocked by the two groups of base materials 6 outside the narrow weld bead 8 for welding protection.

[0053] It should be noted that when performing narrow gap thick plate welding with the cable welding wire 7, the inner protective cover 201 can be extended into the narrow gap weld for welding, and the elongation of the inner protective cover 201 can be arbitrarily adjusted with the movement of the conductive nozzle 3; when performing base welding and filling welding, the shielding gas is blown toward the molten pool through the air channel formed by the side wall of the parent material 6 and the inner protective cover 201 to ensure the welding quality; after continuous welding and filling of the weld, the position of the inner protective cover 201 is raised as a whole with the welding gun, but the outer protective cover 1 is still carried on the parent material 6 workpiece, and its relative position remains unchanged. At this time, the outer protective cover 1 covers the symmetrical groove 202 of the raised inner protective cover 201 to prevent the shielding gas from leaking from the groove 202 of the inner protective cover 201; when performing cover welding, the welding gun as a whole is now larger than the surface of the parent material 6, and the outer protective cover 1 is placed on the support platform 203 protruding below the inner protective cover 201, and synchronously leaves the surface of the parent material 6, thereby completing the cover welding.

[0054] It should be noted that the narrow gap thick plate welding protective cover device based on rotating arc is applied to the narrow gap thick plate welding of cable-type welding wire 7. The welding groove is narrow, which is not conducive to observing the molten pool, so it is generally suitable for semi-automatic welding of welding trolley or automatic welding of welding robot; the configuration of molten pool monitoring system can better observe the molten pool and side wall fusion.

[0055] In summary, the present invention enables the inner layer protection component 2 to extend into the narrow gap weld bead 8 through the coordinated arrangement of the inner layer protection component 2, the outer layer protection sleeve 1, the base material 6 and the narrow gap weld bead 8, so that the bottom of the inner layer protection sleeve 201 can enter the narrow gap weld, and the elongation of the inner layer protection sleeve 201 in the narrow gap weld bead 8 can be freely controlled while the height of the conductive nozzle 3 is arbitrarily adjusted; at the same time, the outer layer protection sleeve 1 can be prevented from falling off by the support platform 203 at the lower end of the air outlet of the inner layer protection sleeve 201; during welding, the outer layer protection sleeve 1 is placed on the surface of the base material 6, that is, the outer layer protection sleeve 1 is placed on the upper surface of the weldment to prevent the protective gas from overflowing from the weldment surface and the groove 202, so that the protective gas is completely blown to the molten pool, the weld is protected, and pores and cracks are avoided; and when performing cover welding of the narrow gap weld bead 8, the welding gun as a whole is larger than the surface of the base material 6. At this time, the outer layer protection sleeve 1 is placed on the support platform 203 and synchronously leaves the surface of the base material 6, thereby completing the cover welding.

[0056] In order to facilitate understanding of the above technical solutions of the present invention, the working principle or operation mode of the present invention in the actual process is described in detail below.

[0057] In actual application, the inner protective sleeve 201 has a length of 200 mm, an inner diameter of 25 mm, an outer diameter of 30 mm, and a wall thickness of 2.5 mm; the inner protective sleeve 201 has a groove 202 of 100 mm in the longitudinal direction of the air outlet, and a groove 202 of 8 mm in the transverse direction of the air outlet; the outer protective sleeve 1 has a length of 100 mm, an inner diameter of 31 mm, an outer diameter of 36 mm, and a wall thickness of 2.5 mm; the assembly clearance between the inner protective sleeve 201 and the outer protective sleeve 1 is 1.0mm; put the outer protective sleeve 1 on the outside of the inner protective component 2, and then put the assembly of the outer protective sleeve 1 and the inner protective component 2 on the welding gun head and install it tightly, that is, install the inner protective component 2 on the outside of the welding gun nozzle 5, actually the inner protective component 2 is in contact with the welding gun body, and the outer protective sleeve 1 is in contact with the inner protective component 2; then prepare two groups of parent materials 6 in advance, that is, prepare 100mm thick butt welding test plates without beveling, the two groups of parent materials 6 form a flat butt weld form, and the width of the narrow weld bead 8 is 12mm; then use the pre-prepared welding vehicle to move the conductive nozzle 3 and the inner protective component 2 into the narrow weld bead 8 for welding, and at the same time, the outer protective sleeve 1 will be blocked by the two groups of parent materials 6 outside the narrow weld bead 8 for welding protection, that is, with The welding gun of the narrow gap thick plate welding protective cover device is installed on the welding trolley, and the welding trolley is used for automatic welding. Before the rotary arc welding is started, the outer protective cover 1 is put on the inner protective cover 201, and the lower end of the outer protective cover 1 is placed on the upper surface of the parent material 6; the welding gun is inserted into the butt weld of the welding test plate, and the inner protective cover 201 extends into the narrow gap weld bead 8, and the part of the inner protective cover 201 cutting the groove 202 extends into the narrow gap weld bead 8 and keeps a certain interval with the bottom of the narrow gap weld bead 8. The cable welding wire 7 passes through the conductive nozzle 3 and the connecting pipe 4, and the dry extension is determined, and welding can be prepared; the outer protective cover 1 is placed on the surface of the test plate, that is, the outer protective cover 1 is placed on the surface of the two groups of parent materials 6; when performing base welding and filling welding, the cable welding wire 7 generates a self-rotating arc during melting to ensure the fusion quality of the side wall of the parent material, and the shielding gas is blown to the molten pool through the air channel formed by the side wall of the parent material 6 and the inner protective sleeve 201 to ensure the welding quality. As the welding is carried out layer by layer, the narrow weld bead 8 will be filled accordingly. After each layer is welded, the welding gun will be lifted up and moved upward as a whole, and then return to the arc starting point to continue welding. When welding a new layer of weld bead, the outer protective sleeve 1 is put on the inner protective sleeve 201, and the lower end of the outer protective sleeve 1 is placed on the upper surface of the parent material 6. The inner protective sleeve 201 maintains a fixed interval with the bottom of the narrow weld bead 8. Although part of the groove 202 on the inner protective sleeve 201 will move upward to form the narrow weld bead 8, the outer protective sleeve 1 is covered on the outside of the inner protective sleeve 201, and no shielding gas will enter the weld bead 8 during the welding process. Leakage here; under the continuous welding of the narrow weld 8, until the deposited metal fills the near surface of the welding test plate, that is, when the narrow weld 8 is about to be welded and filled, the combination of the conductive nozzle 3, the connecting pipe 4 and the welding gun nozzle 5 and the inner protective sleeve 201 are completely moved up and out of the narrow weld 8, and the outer protective sleeve 1 is placed on the protruding platform at the bottom of the inner protective sleeve 201, and then moves up and away from the surface of the parent material 6. That is, at this time, the outer protective sleeve 1 contacts the protruding support platform 203 of the inner protective sleeve 201 and is lifted by the inner protective sleeve 201. The groove of the inner protective sleeve 201 is completely covered by the outer protective sleeve 1, and the protective gas will not leak out from here, and it will be completely blown to the molten pool along the gas channel formed by the outer protective sleeve 1 and the inner protective sleeve 201 to protect the weld until the weld is filled. .

[0058] In summary, with the aid of the above technical solution of the present invention, an outer protective sleeve 1 is arranged on the outer side of the bottom of the inner protective assembly 2, so that the outer protective sleeve 1 is placed on the surface of the two groups of parent materials 6 during welding, so that the protective gas will not leak on the surface of the two groups of parent materials 6 and the groove 202, and can be completely blown into the molten pool of the narrow weld 8 to ensure the quality of the weld; and under the action of the groove 202, the inner protective sleeve 201 can be extended into the narrow weld 8, thereby ensuring that the inner protective sleeve 201 can move freely in the narrow weld 8, thereby ensuring that the outer protective sleeve 1 is always in contact with the surface of the two groups of parent materials 6, and ensuring the continuity of welding protection; through the narrow weld 8, the loss of the parent material 6 and the cable welding wire 7 and the number of welding layers are greatly reduced, which can greatly improve the welding efficiency of the thick plate and reduce the cost of production and manufacturing; and through the combined design of the inner protective assembly 2 and the outer protective sleeve 1, it is convenient to directly disassemble and replace the protective sleeve on the welding gun, saving the maintenance cost of the device.

[0059] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A protective sleeve device for narrow gap thick plate welding based on rotating arc, characterized in that: The invention comprises an inner layer protection component (2) installed on the outside of a welding gun nozzle (5), an outer layer protection sleeve (1) matching with the inner layer protection component (2) is arranged on the outside of the bottom of the inner layer protection component (2), a base material (6) matching with the inner layer protection sleeve (1) is symmetrically arranged on the bottom of the outer layer protection sleeve (1), and a narrow weld bead (8) matching with the inner layer protection component (2) is arranged between two groups of the base materials (6); A connecting tube (4) is provided at the bottom end of the welding gun nozzle (5), a conductive nozzle (3) is provided at the bottom end of the connecting tube (4), and a cable-type welding wire (7) is provided inside the conductive nozzle (3) and penetrates the welding gun nozzle (5) and the connecting tube (4).

2. The rotating arc-based narrow gap thick plate welding protective cover device according to claim 1 is characterized in that: The inner layer protection assembly (2) comprises an inner layer protection sleeve (201) arranged outside the welding gun nozzle (5), the bottom of the inner layer protection sleeve (201) is symmetrically provided with grooves (202) matching the narrow weld bead (8), and the bottom end of the inner layer protection sleeve (201) is symmetrically provided with a support platform (203) matching the outer layer protection sleeve (1).

3. The rotating arc-based narrow gap thick plate welding protective cover device according to claim 2 is characterized in that: The outer protective cover (1) is a hollow cylindrical structure, and the height of the inner protective cover (201) is greater than the height of the outer protective cover (1).

4. The narrow gap thick plate welding protective cover device based on rotating arc according to claim 1 is characterized in that: The width of the narrow weld bead (8) is smaller than the inner diameter of the outer protective sleeve (1).

5. The narrow gap thick plate welding protective cover device based on rotating arc according to claim 2 is characterized in that: The height of the groove (202) is less than or equal to the height of the outer protective sleeve (1).

6. The narrow gap thick plate welding protective cover device based on rotating arc according to claim 2 is characterized in that: The support platform (203) is located between the two groups of grooves (202).

7. The narrow gap thick plate welding protective cover device based on rotating arc according to claim 2 is characterized in that: The width of the supporting platform (203) is greater than the thickness of the outer protective cover (1).

8. The narrow gap thick plate welding protective cover device based on rotating arc according to claim 2 is characterized in that: The length of the support platform (203) is smaller than the width of the narrow weld bead (8).

9. The narrow gap thick plate welding protective cover device based on rotating arc according to claim 1 is characterized in that: The conductive nozzle (3) is located inside the narrow weld bead (8).

10. A method for using a narrow gap thick plate welding protective cover device based on a rotating arc, which is used to implement the use of the narrow gap thick plate welding protective cover device based on a rotating arc according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: S1, putting the outer protective sleeve (1) on the outer side of the inner protective assembly (2), and then installing the inner protective assembly (2) on the outer side of the welding gun nozzle (5); S2, based on the two groups of the parent materials (6) being prepared in advance, the narrow weld bead (8) is provided between the two groups of the parent materials (6); S3. The conductive nozzle (3) and the inner layer protection assembly (2) are moved into the narrow weld bead (8) for welding by means of a pre-prepared welding vehicle. Meanwhile, the outer layer protection sleeve (1) is blocked by the two groups of the base materials (6) outside the narrow weld bead (8) for welding protection.

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