A protective welding torch for electric welding of steel structures and its application method

Abstract

This invention discloses a protective welding hopper for steel structure welding and its usage method, comprising a segment overhang interceptor assembly, a crossing end spacing adjuster, and a welding point segment grabbing mesh assembly. The crossing end spacing adjuster is disposed inside the welding point segment grabbing mesh assembly. The segment overhang interceptor assembly is used to cross the gaps in the mesh frame and extend to the isolated welding point. By pressing the end of the connecting wall resistance limiting part into an inclined state across the mesh frame, the front end of the connecting wall resistance limiting part is placed on the welding end. The protective spacing between the connecting wall resistance limiting part and the overhang end alignment and collection part reduces the spacing between the mesh frame and the welding end face, so that the segment overhang interceptor assembly, as the welding point, covers the bottom of the welding point as the welding point, avoiding interference from the arrangement of the connecting wall resistance limiting part and the overhang end alignment and collection part during assembly. It is effectively suitable for welding at small-spacing assembly points isolated by the mesh frame, and at the same time, it is convenient to flexibly change the welding point position at small-spacing assembly points.

Description

Technical Field

[0001] This invention relates to the field of structural welding technology, and in particular to a protective welding hopper for electric welding of steel structures and its application method. Background Technology

[0002] Steel structure welding is a method of connecting building structures, commonly used for fixing beams, columns, and structural points in steel structure buildings. To ensure the interception of weld spatter during high-altitude welding, the traditional method involves installing a slag catcher along the welded steel column or beam structure. While this method offers good interception and protection, its applicability in small spaces is limited due to the need for stable support. Furthermore, in existing construction practices, if a protective mesh frame already exists outside the steel structure to be welded, this type of slag catcher cannot be erected within the isolation distance between the steel structure and the mesh frame. The slag catcher cannot directly reach the isolated welding point across the mesh frame's openings, resulting in inadequate alignment, especially in applications with small and dense welding points. This makes it difficult to flexibly change the slag catcher position within the small, isolated welding points, hindering its usability. Therefore, we propose a protective slag catcher for steel structure welding and its application method. Summary of the Invention

[0003] The main objective of this invention is to provide a protective welding hopper for electric welding of steel structures and its method of use, in order to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A protective welding hopper for steel structure welding includes a section overhang interception component, a crossing end spacing adjustment component, and a weld point section grabbing mesh component. The crossing end spacing adjustment component is disposed inside the weld point section grabbing mesh component. The section overhang interception component is used to cross the gap of the mesh frame and extend to the isolated welding point. The crossing end spacing adjustment component is used to adjust the grabbing distance between the weld point section grabbing mesh component and the mesh frame when the weld point section grabbing mesh component is located at the isolated welding point. The section overhang interception component is equipped with an angled support peeling component.

[0006] The segment overflow interception assembly includes a wall surface resistance limiting part, a point filling angle guiding part, an overflow alignment and collection part, and a segment separation processing box. The point filling angle guiding part is fixedly connected between the wall surface resistance limiting part and the overflow alignment and collection part. The wall surface resistance limiting part is used to be erected on the welding end face when the welding is applied. The point filling angle guiding part is used for directional support when the wall surface resistance limiting part is inclined to be erected on the welding end face. The segment separation processing box is fixedly connected to the bottom of the overflow alignment and collection part. After the wall surface resistance limiting part and the point filling angle guiding part are inclined to guide the welding slag to the position of the overflow alignment and collection part, the welding slag is separated by heat insulation through the segment separation processing box.

[0007] The tilt fulcrum peeling assembly includes a segmented moving guide, a tilt crossing drive, a fire-receiving end inner cavity feeding part, and a crossing transmission connection part. The segmented moving guide is fixedly connected to the outside of the wall-receiving surface resistance limiting part and the overshooting end alignment and collection part. The tilt crossing drive is disposed on the inside of the segmented moving guide. The fire-receiving end inner cavity feeding part is fixed to the transmission end of the tilt crossing drive. The crossing transmission connection part is fixedly connected to the outside of the point-filling angle guide. When the wall-receiving surface resistance limiting part and the overshooting end alignment and collection part are in an inclined erection state, the crossing transmission connection part is used for crossing guidance when the tilt crossing drive part slides along the two sets of segmented moving guides.

[0008] A further improvement of the present invention is that the weld joint section mesh gripping assembly includes a longitudinal limiting part for gripping section, a contact end flat angle adjustment part, and a semi-circular mesh tightening part. The contact end flat angle adjustment part is installed between the longitudinal limiting part for gripping section and the semi-circular mesh tightening part. The longitudinal limiting part for gripping section and the semi-circular mesh tightening part are clamped in the weld joint mesh frame and are used for support when the wall resistance limiting part extends to the isolated weld joint. The contact end flat angle adjustment part is used to adjust the support angle between the semi-circular mesh tightening part and the mesh frame ribs.

[0009] A further improvement of the present invention is that the cross-end spacing adjustment component includes a counter-threaded transmission part and a bi-directional tightening connection part. The bi-directional tightening connection part passes through the longitudinal limiting part of the gripping section and is threadedly connected to the longitudinal limiting part of the gripping section. The bi-directional tightening connection part is fixedly connected to the outside of the counter-threaded transmission part. The counter-threaded transmission part is used to adjust the longitudinal distribution spacing of the longitudinal limiting part of the gripping section.

[0010] A further improvement of the present invention is that the overhanging end alignment and collection part is fixedly connected to the longitudinal limiting part of the gripping section, and a self-resetting elastic linkage is installed between the overhanging end alignment and collection part and the wall resistance limiting part. The self-resetting elastic linkage is used for automatic reset when the point filling angle guide part releases the tilted erection support. The overhanging end alignment and collection part has a slag discharge cavity, and the overhanging end alignment and collection part is connected to the partition separation and processing box through the slag discharge cavity.

[0011] A further improvement of the present invention is a method of using a protective welding torch for electric welding of steel structures, comprising the following steps:

[0012] Step S1: Select the corresponding position of the welding point on the space frame and assemble the segment overhang interception component. When the distance between the space frame and the welding end face is close, the wall resistance limiting part is squeezed at the end and crosses the space frame in an inclined state until the front end of the wall resistance limiting part is placed on the welding end. The protective distance between the wall resistance limiting part and the overhang alignment collection part is reduced, thereby fitting the distance between the space frame and the welding end face, and avoiding interference from the arrangement of the wall resistance limiting part and the overhang alignment collection part during assembly.

[0013] Step S2: After the wall resistance limiting part crosses the grid frame, the opposing threaded transmission part is screwed on the bidirectional tightening connection part, so that the two sets of longitudinal limiting parts of the gripping section move in opposite directions under the transmission action of the opposing threaded transmission part. The semi-arc hanging mesh tightening part and the longitudinal limiting part of the gripping section provide gripping support force with the grid frame, so that the wall resistance limiting part and the overrun end alignment and collection part remain in a fixed state.

[0014] After step S3, the wall resistance limiting part, the point filling angle guiding part, and the overhanging end alignment and collection part are erected across the space frame, the bottom of the welding point is covered. When the welding slag splashes down, it is guided by the inclined direction of the wall resistance limiting part and sent into the partition separation treatment box to complete the isolation and collection. It is suitable for use in welding at small-pitch assembly points isolated by the space frame.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: When the isolation distance between the protective mesh frame and the welding end face is close, the mesh frame can be crossed by the end of the wall resistance limiting part being squeezed in an inclined state, so that the front end of the wall resistance limiting part is placed on the welding end. The protective distance between the wall resistance limiting part and the overhanging end alignment and collection part is reduced to reduce the distance between the mesh frame and the welding end face. The section overhanging end interception component is used as the fire receiving part to cover the bottom of the welding point, avoiding the interference of the wall resistance limiting part and the overhanging end alignment and collection part during assembly. It is effectively applicable to the fire receiving use of small-pitch assembly points isolated by the mesh frame. At the same time, it is convenient to flexibly change the fire receiving position at small-pitch assembly points, ensuring the flexibility of use in this environment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a protective welding hopper for electric welding of steel structures according to the present invention. Figure 1 .

[0017] Figure 2 This is a schematic diagram of the structure of a protective welding hopper for electric welding of steel structures according to the present invention. Figure 2 .

[0018] Figure 3 This is a schematic diagram of the assembled state of a protective welding hopper for electric welding of steel structures according to the present invention.

[0019] In the diagram: 1. Interval overrun interception assembly; 11. Wall resistance limiting part; 12. Point filling angle guiding part; 13. Overrun alignment and collection part; 131. Slag discharge cavity; 14. Interval separation treatment box; 2. Crossover end spacing adjustment part; 21. Opposing thread transmission part; 22. Bidirectional tightening connection part; 3. Welding point interval mesh grabbing assembly; 31. Grasping interval longitudinal limiting part; 32. Contact end flat angle adjustment part; 33. Semi-arc mesh tightening part; 4. Inclined fulcrum peeling assembly; 41. Segmented moving guide part; 42. Inclined crossing drive part; 43. Fire-receiving end inner cavity conveying part; 44. Crossover transmission connection part; 5. Self-resetting elastic linkage part. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. In order to better illustrate the specific embodiments of the present invention, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the actual product size. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-3 A protective welding shield for steel structure welding includes a section-extension interception assembly 1, a crossing-end spacing adjustment component 2, and a welding point section mesh-grabbing assembly 3. The crossing-end spacing adjustment component 2 is disposed inside the welding point section mesh-grabbing assembly 3. The section-extension interception assembly 1 is used to cross the gaps in the mesh frame and extend to the isolated welding point. The crossing-end spacing adjustment component 2 is used to adjust the gripping distance between the welding point section mesh-grabbing assembly 3 and the mesh frame when it is located at the isolated welding point. The section-extension interception assembly 1 is equipped with an angled support peeling component 4.

[0022] In this embodiment, to ensure that the welding structure can be erected within the isolation gap between the steel structure and the space frame, the present invention uses the segment overhang interception component 1 to cross the space frame aperture and reach the inside of the isolation gap. The rotating connection of the point filling angle guide part 12 allows the wall resistance limiting part 11 and the overhang alignment and collection part 13 to adapt to the rotational tilt of the assembly gap, thus enabling welding to be performed within the gap between the welding points of the space frame and the steel structure, corresponding to the welding point location.

[0023] The segment overflow interception assembly 1 includes a wall surface resistance limiting part 11, a point filling angle guiding part 12, an overflow end alignment and collection part 13, and a segment separation processing box 14. The point filling angle guiding part 12 is fixedly connected between the wall surface resistance limiting part 11 and the overflow end alignment and collection part 13. The wall surface resistance limiting part 11 is used to be erected on the welding end face during welding, and the point filling angle guiding part 12 is used for directional support when the wall surface resistance limiting part 11 is inclined and erected on the welding end face. The segment separation processing box 14 is fixedly connected to the bottom of the overflow end alignment and collection part 13. After the wall surface resistance limiting part 11 and the point filling angle guiding part 12 inclinedly guide the welding slag to the position of the overflow end alignment and collection part 13, the welding slag is separated by heat insulation through the segment separation processing box 14.

[0024] In this embodiment, the operation method of the segment overrun interception component 1 of the present invention to cross the grid aperture to reach the steel structure welding point is as follows: the end of the connecting wall resistance limiting part 11 is squeezed, so that the connecting wall resistance limiting part 11 crosses the grid in an inclined state due to the rotation of the point filling angle guiding part 12. At this time, the protective distance between the connecting wall resistance limiting part 11 and the overrun alignment and collection part 13 is reduced until the front end of the connecting wall resistance limiting part 11 is placed on the welding end, and the segment longitudinal limiting part 31 and the semi-arc hanging net collection part are grasped. After the tightening part 33 reaches the inner side of the space frame, the longitudinal limiting part 31 of the gripping section and the semi-arc hanging mesh tightening part 33 are engaged and positioned with the inner side ribs of the space frame, so that the wall resistance limiting part 11, the point filling angle guiding part 12 and the overhanging end alignment and collection part 13 fit the distance between the space frame and the welding end face, so as to avoid the wall resistance limiting part 11 and the overhanging end alignment and collection part 13 being interfered with by the arrangement during assembly, and the wall resistance limiting part 11 and the overhanging end alignment and collection part 13 can be adapted to a smaller assembly spacing by changing the tilt angle.

[0025] The tilting pivot stripping assembly 4 includes a segmented moving guide 41, a tilting traversing drive 42, a fire-receiving end inner cavity feeding part 43, and a traversing transmission connection 44. The segmented moving guide 41 is fixedly connected to the outside of the fire-receiving wall resistance limiting part 11 and the outgoing end alignment and collection part 13, and the tilting traversing drive 42 is disposed on the inside of the segmented moving guide 41. The fire-receiving end inner cavity feeding part 43 is fixed to the transmission end of the tilting traversing drive 42, and the traversing transmission connection 44 is fixedly connected to the outside of the point filling angle guide 12. When the fire-receiving wall resistance limiting part 11 and the outgoing end alignment and collection part 13 are in an inclined erected state, the traversing transmission connection 44 is used for traversing guidance when the tilting traversing drive 42 slides along the two segments of the segmented moving guide 41.

[0026] In this embodiment, to ensure that the welding slag does not slide off due to accumulation after falling onto the inclined contact wall resistance limiting part 11, the tilt angle crossing drive part 42 is set to reciprocate for a set duration. This causes the tilt angle crossing drive part 42 to slide along the inner side of the segmented moving guide part 41, thereby guiding the inner cavity conveying part 43 of the welding end to slide along the distribution surface of the contact wall resistance limiting part 11 and the point filling angle guide part 12. This quickly peels off the welding slag remaining on the surface of the contact wall resistance limiting part 11 and the point filling angle guide part 12 to the position of the overflow end alignment and collection part 13, until the welding slag is guided by the slag discharge cavity 131 and falls into the inner side of the partition separation and processing box 14 for collection. At the same time, to ensure the sliding stability of the segmented moving guide part 41 provided at the position of the tilt angle crossing drive part 42 along the contact wall resistance limiting part 11 and the overflow end alignment and collection part 13, the following measures are taken. By using the cross-transmission connection 44 as the sliding connection point of the two-part segmented moving guide 41, the tilt angle cross-drive 42 can enter the segmented moving guide 41 installed at the point filling angle guide 12 after being disengaged from the segmented moving guide 41 installed at the position of the wall resistance limiting part 11. This avoids the sliding connection of the tilt angle cross-drive 42 inside the segmented moving guide 41 being blocked after the wall resistance limiting part 11 is tilted.

[0027] The weld joint section mesh gripping assembly 3 includes a longitudinal limiting part 31 for gripping the section, a contact end flat angle adjustment part 32, and a semi-circular mesh tightening part 33. The contact end flat angle adjustment part 32 is installed between the longitudinal limiting part 31 for gripping the section and the semi-circular mesh tightening part 33. The longitudinal limiting part 31 for gripping the section and the semi-circular mesh tightening part 33 clamp the mesh frame at the welding point and provide support when the wall resistance limiting part 11 extends to the isolated welding point. The contact end flat angle adjustment part 32 is used to adjust the support angle between the semi-circular mesh tightening part 33 and the mesh frame ribs.

[0028] In this embodiment, the contact end flat angle adjustment part 32 can slightly adjust the clamping distance between the semi-arc hanging mesh tightening part 33 and the longitudinal restriction part 31 of the gripping section according to the distribution spacing of the grid ribs, so that the semi-arc hanging mesh tightening part 33 and the longitudinal restriction part 31 of the gripping section can be stably engaged at the inner rib position of the grid, without the need to build an assembly structure along the steel structure welding point, and can be flexibly assembled and used at any aperture position of the isolation grid to ensure coverage of the welding contact point.

[0029] The cross-end spacing adjustment component 2 includes a counter-threaded drive part 21 and a bi-directional tightening connection part 22. The bi-directional tightening connection part 22 passes through the longitudinal limiting part 31 of the gripping section and is threadedly connected to the longitudinal limiting part 31 of the gripping section. The bi-directional tightening connection part 22 is fixedly connected to the outside of the counter-threaded drive part 21, which is used to adjust the longitudinal distribution spacing of the longitudinal limiting part 31 of the gripping section.

[0030] In this embodiment, after the longitudinal limiting part 31 of the gripping section and the semi-circular mesh tightening part 33 reach the inner side of the mesh frame and engage with the reinforcing bars, the opposing threaded transmission part 21 is screwed on by the gripping bidirectional tightening connection part 22, and the longitudinal limiting part 31 of the gripping section and the opposing threaded transmission part 21 are arranged in a threaded transmission configuration. When the longitudinal limiting part 31 of the gripping section and the semi-circular mesh tightening part 33 have initially engaged and limited with the inner reinforcing bars of the mesh frame, the two sets of longitudinal limiting parts 31 of the gripping section move in opposite directions under the threaded transmission action of the opposing threaded transmission part 21, thereby tightening the semi-circular mesh tightening part 33 and the longitudinal limiting part 31 of the gripping section towards the inner reinforcing bars of the mesh frame. The semi-circular mesh tightening part 33 and the longitudinal restriction part 31 of the gripping section provide gripping support between the mesh frame and the wall surface resistance limiting part 11 and the point filling angle guiding part 13 are kept in a fixed state, so that the wall surface resistance limiting part 11 and the overhanging end alignment and collection part 13 always maintain a fixed angle when the fire is used.

[0031] The overhanging end alignment and collection part 13 is fixedly connected to the longitudinal limiting part 31 of the gripping section, and a self-resetting elastic linkage 5 is installed between the overhanging end alignment and collection part 13 and the wall resistance limiting part 11. The self-resetting elastic linkage 5 is used for automatic reset when the point filling angle guide part 12 is released from the inclined erection support. The overhanging end alignment and collection part 13 has a slag discharge cavity 131, and the overhanging end alignment and collection part 13 is connected to the partition separation and processing box 14 through the slag discharge cavity 131.

[0032] In this embodiment, after the wall resistance limiting part 11 and the overhanging end alignment and collection part 13 are removed from the distance between the grid frame and the welding end, the wall resistance limiting part 11 is not squeezed by the welding end wall. The self-resetting elastic linkage 5 automatically rotates and resets the overhanging end alignment and collection part 13 to a horizontal state, so that the tilt angle of the overhanging end alignment and collection part 13 can be readjusted when the assembly position is changed in the future.

[0033] The method of using this invention includes the following steps:

[0034] Step S1: Select the position of the weld point corresponding to the space frame and assemble the segment overhang interception component 1. When the distance between the space frame and the weld end face is close, the space frame is crossed by the pressure of the end of the wall resistance limiting part 11 in an inclined state until the front end of the wall resistance limiting part 11 is placed on the weld end. The protective distance between the wall resistance limiting part 11 and the overhang alignment and collection part 13 is reduced, thereby fitting the distance between the space frame and the weld end face and avoiding interference from the arrangement of the wall resistance limiting part 11 and the overhang alignment and collection part 13 during assembly.

[0035] Step S2: After the wall resistance limiting part 11 crosses the grid frame, the opposing threaded transmission part 21 is screwed on by the bidirectional tightening connection part 22, so that the two sets of gripping section longitudinal limiting parts 31 move in opposite directions under the transmission action of the opposing threaded transmission part 21. The semi-arc hanging mesh tightening part 33 and the gripping section longitudinal limiting part 31 provide gripping support force with the grid frame, so that the wall resistance limiting part 11 and the overhanging end alignment and collection part 12 remain in a fixed state.

[0036] After step S3, the wall resistance limiting part 11, the point filling angle guiding part 12, and the overhanging end alignment and collection part 13 are erected across the space frame, the bottom of the welding point is covered. When the welding slag splashes down, it is guided by the tilt of the wall resistance limiting part 11 and sent into the partition separation treatment box 14 to complete the isolation and collection. It is suitable for use in welding at small-pitch assembly points isolated by the space frame.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A shielded fire pot for electric welding of steel structures, characterized in that, The device includes a segment overrun interceptor (1), a crossing end spacing adjuster (2), and a weld point segment grabbing assembly (3). The crossing end spacing adjuster (2) is located inside the weld point segment grabbing assembly (3). The segment overrun interceptor (1) is used to cross the gaps in the mesh frame and extend to the isolated weld point. The crossing end spacing adjuster (2) is used to adjust the grabbing distance between the weld point segment grabbing assembly (3) and the mesh frame when it is located at the isolated weld point. The segment overrun interceptor (1) is equipped with an angled fulcrum peeling assembly (4). The segment overflow interception assembly (1) includes a wall surface resistance limiting part (11), a point filling angle guiding part (12), an overflow end alignment and collection part (13), and a segment separation processing box (14). The point filling angle guiding part (12) is fixedly connected between the wall surface resistance limiting part (11) and the overflow end alignment and collection part (13). The wall surface resistance limiting part (11) is used to be erected on the welding end face when the fire is connected. The point filling angle guiding part (12) is used for directional support when the wall surface resistance limiting part (11) is erected at an angle on the welding end face. The segment separation processing box (14) is fixedly connected to the bottom of the overflow end alignment and collection part (13). After the wall surface resistance limiting part (11) and the point filling angle guiding part (12) tilt and guide the welding slag to the position of the overflow end alignment and collection part (13), the welding slag is separated by the segment separation processing box (14) through heat insulation. The tilt fulcrum stripping assembly (4) includes a segmented moving guide (41), a tilt crossing drive (42), a fire-receiving end inner cavity feeding part (43), and a crossing transmission connection part (44). The segmented moving guide (41) is fixedly connected to the outside of the wall resistance limiting part (11) and the overshoot end alignment and collection part (13). The tilt crossing drive (42) is disposed inside the segmented moving guide (41). The fire-receiving end inner cavity feeding part (43) is fixed to the transmission end of the tilt crossing drive (42). The crossing transmission connection part (44) is fixedly connected to the outside of the point filling angle guide (12). When the wall resistance limiting part (11) and the overshoot end alignment and collection part (13) are in an inclined erection state, the crossing transmission connection part (44) is used for crossing guidance when the tilt crossing drive (42) slides along the two sets of segmented moving guides (41). A self-resetting elastic linkage (5) is installed between the over-end alignment and collection part (13) and the wall surface resistance limiting part (11). The self-resetting elastic linkage (5) is used for automatic reset when the point filling angle guide part (12) releases the inclined erection support. The over-end alignment and collection part (13) has a slag discharge cavity (131). The over-end alignment and collection part (13) is connected to the partition separation and processing box (14) through the slag discharge cavity (131).

2. The protective welding hopper for steel structure welding according to claim 1, characterized in that: The welding point section mesh grabbing assembly (3) includes a gripping section longitudinal restriction part (31), a contact end flat angle adjustment part (32), and a semi-arc mesh tightening part (33). The contact end flat angle adjustment part (32) is installed between the gripping section longitudinal restriction part (31) and the semi-arc mesh tightening part (33). The gripping section longitudinal restriction part (31) and the semi-arc mesh tightening part (33) are clamped in the welding point mesh frame and are used for support when the wall surface resistance restriction part (11) extends to the isolated welding point. The contact end flat angle adjustment part (32) is used to adjust the support angle between the semi-arc mesh tightening part (33) and the mesh frame ribs.

3. A protective welding hopper for steel structure welding according to claim 2, characterized in that: The cross-end spacing adjustment component (2) includes a counter-threaded drive part (21) and a bi-directional tightening connection part (22). The bi-directional tightening connection part (22) passes through the longitudinal restriction part (31) of the gripping section and is threadedly connected to the longitudinal restriction part (31) of the gripping section. The bi-directional tightening connection part (22) is fixedly connected to the outside of the counter-threaded drive part (21). The counter-threaded drive part (21) is used to adjust the longitudinal distribution spacing of the longitudinal restriction part (31) of the gripping section.

4. A protective welding hopper for steel structure welding according to claim 3, characterized in that: The overhanging end alignment and collection part (13) is fixedly connected to the longitudinal restriction part (31) of the gripping section.

5. The steps for using a protective welding hopper for steel structures according to any one of claims 1-4, characterized in that, Includes the following steps: Step S1: Select the corresponding position of the welding point on the grid frame and assemble the segment overrun interception component (1). When the distance between the grid frame and the welding end face is close, the segment is squeezed by the end of the wall resistance limiting part (11) and crosses the grid frame in an inclined state until the front end of the wall resistance limiting part (11) is placed on the welding end. The protective distance between the wall resistance limiting part (11) and the overrun alignment and collection part (13) is reduced, thereby fitting the distance between the grid frame and the welding end face, and avoiding interference from the arrangement of the wall resistance limiting part (11) and the overrun alignment and collection part (13) during assembly. Step S2: After the wall resistance limiting part (11) crosses the grid frame, the opposing threaded transmission part (21) is screwed through the bidirectional tightening connection part (22) so that the two sets of gripping section longitudinal limiting parts (31) move in opposite directions under the transmission action of the opposing threaded transmission part (21). The semi-arc hanging net tightening part (33) and the gripping section longitudinal limiting part (31) provide gripping support force with the grid frame, so that the wall resistance limiting part (11) and the overrun end alignment and collection part (13) remain in a fixed state. After step S3, the wall resistance limiting part (11), the point filling angle guiding part (12), and the overhang end alignment and collection part (13) are erected across the space frame, the bottom of the welding point is covered. When the welding slag splashes down, it is guided by the inclined direction of the wall resistance limiting part (11) and sent into the partition separation treatment box (14) to complete the isolation and collection. It is suitable for use in the welding of small-pitch assembly points isolated by the space frame.

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