Narrow gap gas shielded welding gun for elevator shaft steel frame

Abstract

This invention provides a gas-shielded welding torch for narrow gaps in elevator shaft steel frames, belonging to the technical field of gas-shielded welding equipment. It includes a handle, connecting conduit, insulating sleeve, conductive nozzle seat, and a large nozzle. A small nozzle is disposed between the conductive nozzle and the large nozzle, dividing the cavity within the large nozzle and forming coaxial inner and outer channels. A flow divider is fitted outside the gas orifice to disperse the airflow. The large nozzle is configured to slide along its own axial direction, allowing it to have extended and retracted states. By configuring the large and small nozzles, when space is sufficient, the large nozzle is in the extended state, where both the large and small nozzles simultaneously deliver shielding gas, forming a sufficient gas protection area. When the welding space is narrow, the large nozzle is retracted, exposing the small nozzle. The smaller nozzle can then extend into the narrow gap and precisely deliver shielding gas to the welding area.

Description

Technical Field

[0001] This invention belongs to the technical field of gas shielded welding equipment, specifically referring to a gas shielded welding torch for narrow gaps in elevator shaft steel frames. Background Technology

[0002] In the field of retrofitting elevators into existing buildings, steel-framed elevator shafts have become the most widely used mainstream structural form. They typically include a load-bearing shaft constructed from spliced ​​steel sections, an external enclosure structure, and an entrance corridor connecting to the existing building. Currently, these steel structure shafts are mostly installed using on-site splicing and welding methods, and the exterior facade is often complemented by glass curtain walls or metal panels to achieve lightweighting and lighting requirements.

[0003] In gas shielded welding, the nozzle size of the welding torch directly affects the coverage effect of the shielding gas and the welding quality. Currently, to ensure the formation of a sufficient gas curtain and effectively prevent air from oxidizing the molten pool, most gas shielded welding torches use nozzles with relatively large radial dimensions.

[0004] While large nozzles can expand the protection range, they also increase the overall size of the nozzle, limiting its operation in narrow spaces or complex structures. This makes it difficult to reach into the gaps between components in narrow shafts for flexible welding during elevator shaft manufacturing and installation. Furthermore, the problem of excessively thick nozzles also affects the structural design of elevator shafts, limiting the optimization of the elevator shaft steel frame structure. Summary of the Invention

[0005] In view of the above situation and to overcome the defects of the prior art, the purpose of the present invention is to provide a gas shielded welding torch for narrow gaps in elevator shaft steel frames, so as to at least partially solve the problems mentioned in the background art.

[0006] The technical solution adopted by this invention is as follows: This invention proposes a gas-shielded welding torch for narrow gaps in elevator shaft steel frames, comprising: The handle has a connecting tube fixed to its operating end, and an insulating sleeve is fitted and fixed on the connecting tube. A conductive nozzle holder is installed at the wire outlet end of the connecting conduit, and the end of the conductive nozzle holder near the insulating sleeve is provided with a vent for conveying protective gas, and a conductive nozzle is connected to the wire outlet end of the conductive nozzle holder. A large nozzle is fitted onto the outside of the conductive nozzle seat and connected to the insulating sleeve; A small nozzle is provided between the conductive nozzle and the large nozzle so that the cavity inside the large nozzle is divided and forms an inner channel and an outer channel that are coaxial with each other. A flow divider is fitted around the outside of the air hole to disperse the airflow. Both the inner channel and the outer channel are connected to the flow divider so that protective airflow can be formed in both the inner channel and the outer channel. The large nozzle is configured to slide along its own axis, so that the large nozzle has an extended state and a retracted state.

[0007] Furthermore, when the large nozzle is in the extended state, the ends of the large nozzle and the small nozzle away from the insulating sleeve are provided with a clearance cavity along the exhaust direction.

[0008] Furthermore, the conductive nozzle is slidably sleeved on the conductive nozzle seat, and the conductive nozzle is configured to have an extended state and a retracted state synchronized with the large nozzle.

[0009] Furthermore, when the large nozzle is in the extended state, the wire-out end of the conductive nozzle is located inside the large nozzle; when the large nozzle is in the retracted state, the wire-out end of the conductive nozzle is located inside the small nozzle.

[0010] Furthermore, the small nozzle is provided with a groove along its own axis, and a push rod connected to the large nozzle is provided in the groove. The conductive nozzle is provided with a hollow tail plate, and the push rod is located on the side of the hollow tail plate facing the insulating sleeve, so that when the large nozzle is in the extended state, the push rod can push the conductive nozzle to also be in the extended state.

[0011] Furthermore, the groove is provided with two mutually fitting sealing strips to seal the groove, and the push rod is located between the two sealing strips, and can push the sealing strips to both sides when sliding.

[0012] Furthermore, a first spring is sleeved on the conductive nozzle seat, one end of the first spring is connected to the conductive nozzle seat, and the other end of the first spring is connected to the hollow tail plate. The first spring is configured to apply a pulling force to the hollow tail plate in the direction of the insulating sleeve, so that when the large nozzle is in the contracted state, the first spring can pull the conductive nozzle to also be in the contracted state.

[0013] Furthermore, a second spring is fitted onto the insulating sleeve, one end of which is connected to the insulating sleeve and the other end of which is connected to the large nozzle. The second spring is configured to apply a thrust toward the large nozzle in the wire feeding direction so that the large nozzle extends.

[0014] Furthermore, the thrust of the second spring is greater than the tension of the first spring, so that the large nozzle can push the conductive tip out.

[0015] Furthermore, a perforated cover is provided at one end of the small nozzle near the flow divider, and the perforated cover is fitted onto the flow divider.

[0016] Beneficial effects: 1. By setting up a large nozzle and a small nozzle, two gas delivery channels are formed within the large nozzle. The large nozzle is designed to slide out and retract. When space is sufficient, the large nozzle is in the extended state, and at this time, the shielding gas is delivered simultaneously by the large and small nozzles, forming a sufficient gas protection area. When the welding space is narrow, the large nozzle is retracted, exposing the small nozzle. The smaller nozzle can extend into the narrow gap and precisely deliver shielding gas to the weld area.

[0017] 2. By setting the conductive tip to extend or retract synchronously with the large nozzle, when the large nozzle extends, the conductive tip extends synchronously and moves to a position that matches the end of the large nozzle. When the large nozzle retracts, the conductive tip retracts synchronously and moves to a position that matches the end of the small nozzle, ensuring that the wire feeding position of the conductive tip is always at the output end of the shielding gas, thus ensuring welding quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a gas-shielded welding torch for a narrow gap in an elevator shaft steel frame, as proposed in an embodiment of the present invention. Figure 2 This is a schematic diagram of the internal structure of the conductive nozzle, large nozzle, and small nozzle in a gas shielded welding torch for a narrow gap in an elevator shaft steel frame, as proposed in an embodiment of the present invention. Figure 3 This is a schematic diagram showing the connection position of the conductive nozzle seat, the conductive nozzle, and the first spring in a gas shielded welding torch for a narrow gap in an elevator shaft steel frame, as proposed in an embodiment of the present invention. Figure 4 This is a schematic diagram of the conductive nozzle and hollow tail plate in a gas shielded welding torch for a narrow gap in an elevator shaft steel frame, as proposed in an embodiment of the present invention. Figure 5 This is a schematic diagram of the structure of the flow divider, small nozzle and hollow cover in the gas shielded welding gun in the narrow space of the elevator shaft steel frame according to an embodiment of the present invention; Figure 6 for Figure 5 Enlarged view of point A in the middle; Figure 7 This is a schematic diagram of the structure of the large nozzle and the second spring in a gas-shielded welding torch for a narrow gap in an elevator shaft steel frame, as proposed in an embodiment of the present invention. Figure 8 This is a schematic diagram of the conductive nozzle and large nozzle in the gas shielded welding torch for a narrow gap in an elevator shaft steel frame, as proposed in an embodiment of the present invention, with both the conductive nozzle and the large nozzle in an extended state. Figure 9 This is a schematic diagram of the conductive nozzle and large nozzle in a gas shielded welding torch for a narrow gap in an elevator shaft steel frame, as proposed in an embodiment of the present invention, in a retracted state. Figure 10 This is a schematic diagram showing the position of the conductive nozzle inside the small nozzle when it is in a retracted state in a gas shielded welding torch for a steel frame in an elevator shaft, as proposed in an embodiment of the present invention.

[0019] Among them, 1. Handle; 11. Connecting conduit; 12. Insulating sleeve; 13. Conductive nozzle seat; 101. Air hole; 102. Inner channel; 103. Outer channel; 104. Alternating cavity; 2. Conductive nozzle; 21. Hollowed-out tail plate; 22. First spring; 3. Large nozzle; 31. Second spring; 32. Push rod; 33. Hanging platform; 4. Diverter cover; 5. Small nozzle; 51. Hollowed-out cover; 501. Slide groove; 6. Sealing strip; 7. Hook.

[0020] The accompanying drawings are provided to further understand the embodiments and form part of the specification. They are used together with the embodiments for explanation and do not constitute a limitation on the embodiments. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.

[0022] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments.

[0023] Combination Figure 1 As shown, an embodiment of the present invention provides a gas shielded welding torch for narrow gaps in an elevator shaft steel frame, including a handle 1, a connecting conduit 11, an insulating sleeve 12, a conductive nozzle seat 13, and a conductive nozzle 2.

[0024] The connecting conduit 11 is fixed to the operating end of the handle 1, and the other end of the handle 1 is connected to the wire feeder, air source, and power control module through a pipeline.

[0025] The insulating sleeve 12 is fitted and fixed on the connecting conduit 11. The conductive nozzle seat 13 is installed on the wire outlet end of the connecting conduit 11, and the conductive nozzle seat 13 is provided with a vent 101 for conveying protective gas at one end near the insulating sleeve 12. The conductive nozzle 2 is installed on the wire outlet end of the conductive nozzle seat 13.

[0026] The welding wire fed by the wire feeder passes through the handle 1, the connecting guide tube 11, the conductive nozzle seat 13 and the conductive nozzle 2 in sequence, and is finally output from the conductive nozzle 2. The conductive nozzle seat 13 and the conductive nozzle 2 are energized to melt the welding wire for welding.

[0027] The protective gas supplied by the gas source passes through the handle 1, the connecting tube 11, and the conductive nozzle seat 13 in sequence, and is finally discharged outward through the air hole 101.

[0028] A large nozzle 3 is fitted on the outer side of the conductive nozzle seat 13. One end of the large nozzle 3 is connected to the insulating sleeve 12 to prevent the large nozzle 3 from being electrified. The protective gas discharged from the vent 101 enters the large nozzle 3 and is sprayed out from the large nozzle 3, forming a gas protection zone that isolates air at the welding point.

[0029] Combination Figure 2 As shown, a small nozzle 5 is provided between the conductive nozzle 2 and the large nozzle 3, so that the cavity inside the large nozzle 3 is separated and forms an inner channel 102 and an outer channel 103 that are coaxial with each other. A flow divider 4 for dispersing airflow is sleeved on the outside of the air hole 101. One end of both the small nozzle 5 and the large nozzle 3 extends to the flow divider 4, so that the inner channel 102 and the outer channel 103 are connected to the flow divider 4.

[0030] The protective gas output from the vent 101 is split by the diverter 4 and enters the inner channel 102 and the outer channel 103 respectively, forming a protective gas flow in the inner channel 102 and the outer channel 103, and finally delivered to the welding point.

[0031] Furthermore, the large nozzle 3 is configured to slide along its own axial direction, so that the large nozzle 3 has an extended state and a retracted state.

[0032] In a specific embodiment, a perforated cover 51 is provided at one end of the small nozzle 5 near the flow divider 4. The perforated cover 51 is fitted onto the flow divider 4, and the perforated design of the perforated cover 51 will not affect the delivery of the protective gas.

[0033] It should be noted that the flow divider 4 is connected to the insulating sleeve 12 to prevent the flow divider 4 and the small nozzle 5 from becoming electrified.

[0034] Furthermore, the conductive nozzle 2 is slidably sleeved on the conductive nozzle seat 13, and the conductive nozzle 2 is configured to have an extended state and a retracted state synchronized with the large nozzle 3. When the large nozzle 3 is in the extended state, the wire-out end of the conductive nozzle 2 is located inside the large nozzle 3, and when the large nozzle 3 is in the retracted state, the wire-out end of the conductive nozzle 2 is located inside the small nozzle 5.

[0035] Combination Figure 8 As shown, when the large nozzle 3 is in the extended state, the conductive nozzle 2 is also in the extended state, and the wire outlet end of the conductive nozzle 2 is located inside the large nozzle 3. At this time, the conductive nozzle 2 can be covered by the large nozzle 3. During the welding process, the large nozzle 3 and the small nozzle 5 simultaneously deliver protective gas. The cross-sectional area of ​​the protective gas is large, forming a sufficient gas protection area.

[0036] Combination Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the small nozzle 5 is provided with a groove 501 along its own axis, and a push rod 32 connected to the large nozzle 3 is provided in the groove 501. The conductive nozzle 2 is provided with a hollow tail plate 21, and the push rod 32 is located on the side of the hollow tail plate 21 facing the insulating sleeve 12.

[0037] Combination Figure 7 As shown, a second spring 31 is fitted on the insulating sleeve 12. One end of the second spring 31 is connected to the insulating sleeve 12, and the other end of the second spring 31 is connected to the large nozzle 3. The second spring 31 is configured to apply a thrust to the large nozzle 3 in the direction of wire feeding so that the large nozzle 3 extends.

[0038] Thus, when the large nozzle 3 slides out under the action of the second spring 31, the push rod 32 slides along the slide groove 501. After sliding to contact the hollow tail plate 21, it can push the conductive nozzle 2 to slide out synchronously, so that the large nozzle 3 and the conductive nozzle 2 are in the extended state at the same time (e.g. Figure 8 As shown in the figure, at this time, the wire exit position of the conductive nozzle 2 is matched with the end of the large nozzle 3 to ensure welding quality.

[0039] Combination Figure 5 and Figure 6 As shown, two mutually fitting sealing strips 6 are provided in the chute 501 to seal the chute 501, reduce the amount of air leakage from the small nozzle 5 through the chute 501, and ensure that the protective gas has a sufficient flow rate in the small nozzle 5 to be delivered to the welding point.

[0040] Furthermore, the push rod 32 is located between the two sealing strips 6, which are made of rubber with good elasticity. Therefore, when the push rod 32 slides, it can push the sealing strips 6 to both sides to push them apart, so that the setting of the sealing strips 6 will not affect the sliding of the push rod 32.

[0041] Combination Figure 2 As shown, when the large nozzle 3 is in the extended state, the ends of the large nozzle 3 and the small nozzle 5 away from the insulating sleeve 12 are provided with a clearance cavity 104 along the exhaust direction. That is, the ends of the small nozzle 5 and the large nozzle 3 are left with a certain distance along the exhaust direction. At this time, the gap between the large nozzle 3 and the conductive nozzle 2 will not be blocked. During the welding process, the welding slag will not be blocked here due to the narrow gap.

[0042] Combination Figure 9 and Figure 10 As shown, when the large nozzle 3 is in a retracted state, the small nozzle 5 can be exposed. Correspondingly, the conductive nozzle 2 is also in a retracted state, and the wire outlet end of the conductive nozzle 2 is located inside the small nozzle 5. At this time, the conductive nozzle 2 can be covered by the small nozzle 5. During the welding process, the small nozzle 5 with a smaller diameter can extend into the narrow gap and accurately deliver protective gas to the welding point.

[0043] It is understandable that even when the large nozzle 3 is in a contracted state, it can still output protective gas and form a protective airflow on the outside of the small nozzle 5, thereby playing a role in auxiliary gas supply.

[0044] In a specific embodiment, a first spring 22 is sleeved on the conductive nozzle seat 13. One end of the first spring 22 is connected to the conductive nozzle seat 13, and the other end of the first spring 22 is connected to the hollow tail plate 21. The first spring 22 is configured to apply a pulling force to the hollow tail plate 21 in the direction of the insulating sleeve 12.

[0045] When the large nozzle 3 is in the retracted state, the large nozzle 3 and the push rod 32 slide towards the insulating sleeve 12. At this time, the conductive nozzle 2 is not pushed by the push rod 32, the first spring 22 can retract, and pull the conductive nozzle 2 to move synchronously towards the insulating sleeve 12, so that the conductive nozzle 2 is also in the retracted state, and the conductive nozzle 2 slides to the wire outlet end to match the end of the small nozzle 5, so as to ensure the welding quality.

[0046] It should be noted that since the push rod 32 is not connected to the hollow tail plate 21, and is only pushed by one side of the hollow tail plate 21, when the large nozzle 3 and the conductive nozzle 2 slide and retract, after the conductive nozzle 2 retracts to the designated position, the large nozzle 3 can still continue to slide and retract backward, without affecting the position of the conductive nozzle 2.

[0047] It is understandable that the pushing force of the second spring 31 is greater than the pulling force of the first spring 22, so that when the large nozzle 3 extends, it can overcome the pulling force of the first spring 22, thereby pushing the conductive nozzle 2 to extend outward.

[0048] like Figure 9 As shown, a hook 7 is fixed on the insulating sleeve 12, and a mounting platform 33 corresponding to the hook 7 is provided on the large nozzle 3. When the large nozzle 3 is in the retracted state, the large nozzle 3 and the push rod 32 slide towards the insulating sleeve 12, and the hook 7 is connected to the mounting platform 33, so that the position of the large nozzle 3 is locked. When it is necessary to release the large nozzle 3, the large nozzle 3 can be pushed out by the second spring 31 by disengaging the hook 7 from the mounting platform 33.

[0049] The working principle of this invention is as follows: The handle 1 is connected to the wire feeder, gas source, and power control module through a pipeline. The welding wire fed by the wire feeder passes through the handle 1, connecting conduit 11, conductive nozzle seat 13, and conductive nozzle 2 in sequence, and is finally output from the conductive nozzle 2. The conductive nozzle seat 13 and conductive nozzle 2 are energized to melt the welding wire for welding. The protective gas supplied by the gas source passes through the handle 1, connecting conduit 11, and conductive nozzle seat 13 in sequence, and is finally discharged outward through the gas hole 101. Then, it is divided by the diverter 4 and enters the inner channel 102 and the outer channel 103 respectively, forming a protective gas flow in the inner channel 102 and the outer channel 103, and finally delivered to the welding point.

[0050] When there is sufficient space, the large nozzle 3 is extended under the action of the second spring 31. During the welding process, protective gas is simultaneously delivered by the large nozzle 3 and the small nozzle 5. The cross-sectional area of ​​the protective gas is large, forming a sufficient gas protection area. When the large nozzle 3 slides out, the push rod 32 connected to the large nozzle 3 slides along the slide groove 501. After sliding to contact the hollow tail plate 21, it can push the conductive nozzle 2 to slide out synchronously, so that the large nozzle 3 and the conductive nozzle 2 are simultaneously extended (e.g., Figure 8 As shown in the figure, at this time, the wire exit position of the conductive nozzle 2 is matched with the end of the large nozzle 3 to ensure welding quality.

[0051] When welding is required in a narrow space, the large nozzle 3 is slid and retracted towards the insulating sleeve 12, and the hook 7 is connected to the mounting platform 33, locking the position of the large nozzle 3. The small nozzle 5 can be exposed. During welding, the smaller nozzle 5 can be inserted into the narrow gap and accurately deliver protective gas to the welding point. When the large nozzle 3 slides and retracts, the push rod 32 connected to the large nozzle 3 slides synchronously towards the insulating sleeve 12. At this time, the conductive nozzle 2 is not pushed by the push rod 32, and the first spring 22 can retract and pull the conductive nozzle 2 to move synchronously towards the insulating sleeve 12, so that the conductive nozzle 2 is also in a retracted state. The conductive nozzle 2 slides until the wire outlet end matches the end of the small nozzle 5, ensuring the welding quality.

[0052] When the large nozzle 3 is in the extended state, the ends of the large nozzle 3 and the small nozzle 5 away from the insulating sleeve 12 are provided with a clearance cavity 104 along the exhaust direction. That is, the ends of the small nozzle 5 and the large nozzle 3 are separated by a certain distance along the exhaust direction. At this time, the gap between the large nozzle 3 and the conductive nozzle 2 will not be blocked. During the welding process, the welding slag will not be blocked here due to the narrow gap.

[0053] In summary, by setting up a large nozzle 3 and a small nozzle 5, two air delivery channels, an inner channel 102 and an outer channel 103, are formed inside the large nozzle 3. The large nozzle 3 is designed to be able to slide out or retract. When there is enough space, the large nozzle 3 is in the extended state. At this time, the large nozzle 3 and the small nozzle 5 deliver protective gas simultaneously. The cross-sectional area of ​​the protective gas ejected is large, forming a sufficient gas protection area.

[0054] When the welding space is narrow, the small nozzle 5 can be exposed by shrinking the large nozzle 3. During the welding process, the small nozzle 5 with a smaller diameter can be inserted into the narrow gap and the protective gas can be accurately delivered to the welding point by the small nozzle 5.

[0055] By setting the conductive nozzle 2 to extend or retract synchronously with the large nozzle 3, when the large nozzle 3 extends, the conductive nozzle 2 extends synchronously and moves to a position that matches the end of the large nozzle 3. When the large nozzle 3 retracts, the conductive nozzle 2 retracts synchronously and moves to a position that matches the end of the small nozzle 5, so that the wire feeding position of the conductive nozzle 2 is always at the output end of the protective gas, thus ensuring welding quality.

[0056] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0057] The embodiments have been described above, and such description is not restrictive. The figures shown are only one embodiment, and the actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit, such design should fall within the scope of protection.

Claims

1. A gas-shielded welding torch for narrow gaps in elevator shaft steel frames, characterized in that, include: The handle (1) has a connecting tube (11) fixed at its operating end, and an insulating sleeve (12) is fitted and fixed on the connecting tube (11). A conductive nozzle seat (13) is installed at the wire outlet end of the connecting conduit (11), and a vent (101) for conveying protective gas is provided at one end of the conductive nozzle seat (13) near the insulating sleeve (12), and a conductive nozzle (2) is connected to the wire outlet end of the conductive nozzle seat (13). The large nozzle (3) is fitted on the outside of the conductive nozzle seat (13) and connected to the insulating sleeve (12); A small nozzle (5) is provided between the conductive nozzle (2) and the large nozzle (3) so that the cavity inside the large nozzle (3) is separated and forms an inner channel (102) and an outer channel (103) that are coaxial with each other. The outer side of the air hole (101) is fitted with a flow divider (4) for dispersing airflow. The inner channel (102) and the outer channel (103) are both connected to the flow divider (4) so ​​that protective airflow can be formed in both the inner channel (102) and the outer channel (103). The large nozzle (3) is configured to slide along its own axis so that the large nozzle (3) has an extended state and a retracted state.

2. The gas-shielded welding torch for the narrow gap of the elevator shaft steel frame according to claim 1, characterized in that: When the large nozzle (3) is in the extended state, the end of the large nozzle (3) and the small nozzle (5) away from the insulating sleeve (12) is provided with a clearance cavity (104) along the exhaust direction.

3. The gas-shielded welding torch for the narrow gap of the elevator shaft steel frame according to claim 1, characterized in that: The conductive nozzle (2) is slidably sleeved on the conductive nozzle seat (13), and the conductive nozzle (2) is configured to have an extended state and a retracted state synchronized with the large nozzle (3).

4. The gas-shielded welding torch for the narrow gap of the elevator shaft steel frame according to claim 3, characterized in that: When the large nozzle (3) is in the extended state, the wire-out end of the conductive nozzle (2) is located inside the large nozzle (3). When the large nozzle (3) is in the retracted state, the wire-out end of the conductive nozzle (2) is located inside the small nozzle (5).

5. The gas-shielded welding torch for the narrow gap of the elevator shaft steel frame according to claim 3, characterized in that: The small nozzle (5) is provided with a groove (501) along its own axis. A push rod (32) connected to the large nozzle (3) is provided in the groove (501). The conductive nozzle (2) is provided with a hollow tail plate (21). The push rod (32) is located on the side of the hollow tail plate (21) facing the insulating sleeve (12), so that when the large nozzle (3) is in the extended state, the push rod (32) can push the conductive nozzle (2) to also be in the extended state.

6. The gas-shielded welding torch for the narrow gap of the elevator shaft steel frame according to claim 5, characterized in that: The groove (501) is provided with two mutually fitting sealing strips (6) so that the groove (501) is sealed. The push rod (32) is located between the two sealing strips (6) and can push the sealing strips (6) to both sides when sliding.

7. The gas-shielded welding torch for the narrow gap of the elevator shaft steel frame according to claim 5, characterized in that: A first spring (22) is sleeved on the conductive nozzle seat (13). One end of the first spring (22) is connected to the conductive nozzle seat (13), and the other end of the first spring (22) is connected to the hollow tail plate (21). The first spring (22) is configured to apply a pulling force to the hollow tail plate (21) in the direction of the insulating sleeve (12) so that when the large nozzle (3) is in the contracted state, the first spring (22) can pull the conductive nozzle (2) to also be in the contracted state.

8. The gas-shielded welding torch for the narrow gap of the elevator shaft steel frame according to claim 7, characterized in that: A second spring (31) is fitted on the insulating sleeve (12). One end of the second spring (31) is connected to the insulating sleeve (12), and the other end of the second spring (31) is connected to the large nozzle (3). The second spring (31) is configured to apply a thrust to the large nozzle (3) in the direction of wire feeding so that the large nozzle (3) extends.

9. The gas-shielded welding torch for the narrow gap of the elevator shaft steel frame according to claim 8, characterized in that: The thrust of the second spring (31) is greater than the tension of the first spring (22) so that the large nozzle (3) can push the conductive nozzle (2) out.

10. The gas-shielded welding torch for the narrow gap of the elevator shaft steel frame according to claim 1, characterized in that: The small nozzle (5) is provided with a perforated cover (51) at one end near the flow divider (4), and the perforated cover (51) is fitted onto the flow divider (4).

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