A welding aid for field stainless steel ductwork connections and method

Abstract

The present application relates to the technical field of air pipe welding, and particularly relates to a welding auxiliary device and method for on-site stainless steel air pipe connection; the device comprises a base, an adjusting module vertically fixed on one side of the base, and a limiting module vertically fixed on the adjusting module, wherein the limiting module is provided with a first suction head and a second suction head capable of being horizontally transversely and longitudinally adjusted, and a first adjusting unit and a second adjusting unit capable of respectively adjusting the first suction head and the second suction head to slide; the included angle between the first suction head and the second suction head is set as a right angle; a welding module is adsorbed and detached outside an air pipe plate, and the welding module is provided with a welding head capable of welding two air pipe plate splicing seams and a guide element capable of guiding the welding head to always slide along the welding seam; the present application can not only accurately splice two air pipe plates, but also efficiently weld the splicing part.

Description

Technical Field

[0001] This invention relates to the field of duct welding technology, specifically to a welding auxiliary device and method for on-site stainless steel duct connection. Background Technology

[0002] Stainless steel ducts are widely used in ventilation systems with high airtightness requirements, such as building ventilation, clean rooms, and industrial exhaust systems, due to their corrosion resistance, high strength, and excellent sealing performance. During duct manufacturing and on-site installation, multiple stainless steel plates often need to be spliced ​​and welded to form the required duct cross-sectional structure. Because of the complex on-site construction environment, the large size, thinness, and insufficient rigidity of the plates, precise positioning, stable limiting, and prevention of welding deformation during the welding process become key factors affecting weld quality and installation accuracy.

[0003] Currently, on-site stainless steel duct welding mostly employs manual alignment combined with temporary clamps for positioning. This method has the following main technical problems: 1. Low positioning accuracy and uneven joints: When manually aligning duct plates, operational errors and external disturbances can easily lead to misalignment or uneven gaps at the joints, resulting in unstable weld quality; 2. Insufficient control of welding deformation: Due to the thinness of the duct plates, uneven heat input during welding can easily cause thermal deformation or warping, affecting the sealing and aesthetics of subsequent installation; 3. Simple structure and poor adaptability of limiting devices: Traditional clamps cannot be flexibly adjusted according to changes in duct specifications, making it difficult to quickly position and clamp plates of different sizes; 4. Difficulty in weld tracking and poor welding accuracy: Manual or fixed welding methods cannot dynamically adjust the centering according to changes in weld width, leading to quality defects such as weld misalignment, incomplete penetration, or undercut; 5. Low degree of automation: Most on-site welding still relies on manual vision and experience judgment, lacking auxiliary guidance and real-time correction mechanisms, resulting in high worker workload, low efficiency, and poor consistency. Summary of the Invention

[0004] To address the aforementioned problems, a welding auxiliary device for on-site stainless steel duct connection is provided. This device not only enables rapid positioning of the duct sheet material to be welded but also allows for efficient welding of the weld joint, thereby solving the technical problems of existing welding devices being unable to accurately splice two duct sheet materials and efficiently weld the weld joint.

[0005] To address the problems of existing technologies, this invention provides a welding auxiliary device for on-site stainless steel duct connection, used to limit and guide the splicing and welding of two duct plates, comprising: a base; an adjustment module, vertically fixed on one side of the base; a limiting module, vertically fixed on the adjustment module, the limiting module having a first suction head and a second suction head that can be adjusted horizontally and vertically, and a first adjustment unit and a second adjustment unit that can respectively adjust the sliding of the first suction head and the second suction head; the included angle between the first suction head and the second suction head is set at a right angle; a welding module, adsorbed on the outside of the duct plate, the welding module having a welding head that can weld the splice seam of the two duct plates and a guiding element that can guide the welding head to always slide along the center of the weld seam.

[0006] Preferably, the first adjustment unit is provided with a first guide rod, a first telescopic rod telescopically disposed at the front end of the first guide rod, and a first locking knob capable of locking the first telescopic rod; the first suction head is vertically fixedly disposed at the front end of the first telescopic rod in a vertical state.

[0007] Preferably, the second adjustment unit includes a sliding frame, a second guide rod vertically disposed on one side of the sliding frame, a second telescopic rod telescopically disposed at the front end of the second guide rod, and a second locking knob capable of locking the second telescopic rod; the second suction head is vertically disposed at the front end of the second telescopic rod.

[0008] Preferably, the first suction head consists of a limiting plate and a magnet embedded in the limiting plate; multiple magnets are equidistantly arranged along the long side of the limiting plate.

[0009] Preferably, the adjustment module includes a slide rail and a slider slidably disposed on the slide rail; the slide rail is fixedly disposed vertically on one side of the base; the slider is slidably disposed on the slide rail; and the first adjustment unit is vertically disposed on the slide rail.

[0010] Preferably, the welding module further includes a drive unit capable of driving the welding head to slide horizontally along the weld seam and a third adjustment unit capable of dynamically adjusting the welding distance between the welding head and the weld seam; the welding head is movably disposed at the drive end of the drive unit via the third adjustment unit; the welding head is movably disposed at the front end of the third adjustment unit.

[0011] Preferably, the welding module further includes a connecting frame and an electromagnet capable of quickly adsorbing the drive unit onto the outside of the duct plate; the electromagnet is horizontally fixed to the lower surface of the drive unit via the connecting frame.

[0012] Preferably, the third adjustment unit includes a second limiting seat, an adjusting rod, a hinge joint, a hinge seat, a reset motor, and a fourth locking knob; the second limiting seat is fixedly disposed on the driving end of the driving unit and the fourth locking knob is screwed onto its side wall; the adjusting rod is slidably disposed within the second limiting seat; the hinge joint is fixedly disposed at the front end of the adjusting rod; the hinge seat is fixedly disposed at the end of the welding head and hinged to the hinge joint; the reset motor is fixedly disposed on one side of the hinge joint and passes through the hinge joint to be drively connected to the hinge seat.

[0013] Preferably, the guiding element is provided with a third guide rod that can be dynamically inserted into the weld and a spring that can always elastically drive the axis of the third guide rod into the weld.

[0014] A welding method for on-site stainless steel duct connection, applied to a welding auxiliary device for on-site stainless steel duct connection, includes the following steps: S1: Based on the design dimensions of the duct to be welded, the adjustment module and the limiting module are driven to move. By adjusting the first telescopic rod and the second telescopic rod, the horizontal and vertical limiting distances are set. Then, the first suction head and the second suction head are used to adsorb and fix the two duct plates respectively, so that the splicing edges of the two duct plates are kept parallel. S2: After the two duct panels are fixed, the edge of the duct panels is corrected by the limiting module to keep the splicing gap constant. If multiple duct sections need to be welded continuously, the limiting module is slid along the slide rail to achieve continuous positioning of different welding areas. At this time, the two duct panels form a rectangular tube pre-assembly state before welding, with uniform weld spacing and tight splicing edges. S3: Place the welding module at the pre-welding position on the outside of the duct, activate the electromagnet to attract it, and make the welding module firmly attached to the surface of the duct plate; adjust the angle and height of the welding head to align the center line of the weld with the joint of the plate; insert the tapered correction part of the guide element into the joint gap, and use the spring force to make the tapered correction part automatically center and fit with the weld, forming the initial state of welding guidance; S4: The drive unit starts, driving the welding head to slide horizontally along the weld direction. During the welding process, the welding head achieves dynamic adaptive centering movement under the guidance of the guide element. Even if the weld is slightly offset due to thermal expansion and contraction or micro deformation of the workpiece, the conical correction part will automatically adjust the angle to keep the welding trajectory of the welding head on the center line of the weld until the welding is completed.

[0015] The advantages of this invention compared to the prior art are: 1. This invention uses a combination of multiple sets of telescopic rods and sliding frames through a limiting module and an adjustment module. It can flexibly adjust the horizontal and vertical limiting distances according to the different specifications, thicknesses and sizes of duct plates, and realize universal clamping of ducts of various specifications. It not only simplifies the tooling change process, but also avoids assembly errors caused by differences in plate size, and improves the versatility and on-site adaptability of the equipment.

[0016] 2. The present invention uses an electromagnet installed in the welding module to quickly form a strong adsorption force with the outer wall of the duct after being energized, thereby realizing the rapid positioning and stable installation of the welding module; combined with the dual-point support design of the second suction head, it can provide reliable anti-tilting and anti-vibration support force during the welding process, preventing the welding head from shaking or shifting when sliding at high temperature or long stroke.

[0017] 3. The present invention utilizes the conical correction part in the guiding element, and the spring thrust and conical adaptive structure to ensure that the guiding end is always embedded in the center of the weld and is adjusted in real time with the deformation of the weld; the welding head achieves dynamic sliding along the center of the weld under the constraint of the guiding element, ensuring that the weld trajectory is always centered, and significantly improving the welding forming quality and appearance consistency. Attached Figure Description

[0018] Figure 1 This is a top view of a welding auxiliary device used for on-site stainless steel duct connection.

[0019] Figure 2 yes Figure 1 A magnified view of part A.

[0020] Figure 3 This is a three-dimensional diagram of a welding auxiliary device used for on-site stainless steel duct connection.

[0021] Figure 4 This is a three-dimensional view of a welding auxiliary device used for on-site stainless steel duct connection, showing the removal of duct sheet material.

[0022] Figure 5 yes Figure 4 A magnified view of section B.

[0023] Figure 6 This is a 3D view of a welding auxiliary device used for on-site stainless steel duct connection, showing the removal of the welding module.

[0024] Figure 7 This is an exploded 3D view of the limiting module in a welding auxiliary device used for on-site stainless steel duct connection.

[0025] Figure 8 This is a three-dimensional structural diagram of the welding module in a welding auxiliary device used for on-site stainless steel duct connection.

[0026] The diagram is marked as follows: 1. Base; 11. Ductwork material; 2. Adjustment module; 21. Slide rail; 22. Slider; 3. Limiting module; 31. First suction head; 311. Limiting plate; 312. Magnet; 32. Second suction head; 33. First adjusting unit; 331. First guide rod; 332. First telescopic rod; 333. First locking knob; 34. Second adjusting unit; 341. Sliding frame; 342. Second guide rod; 343. Second telescopic rod; 344. Second locking knob; 345. Third locking knob; 4. Welding module; 41. Welding head; 42. Guide element; 421. Third guide rod; 4211. First limit seat; 4212. Third telescopic rod; 4213. Flange; 4214. Conical correction part; 422. Spring; 43. Drive unit; 44. Third adjustment unit; 441. Second limit seat; 442. Adjusting rod; 443. Hinge joint; 444. Hinge seat; 445. Reset motor; 446. Fourth locking knob; 45. Electromagnet. Detailed Implementation

[0027] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0028] See Figures 1 to 8 The image shows a welding auxiliary device for on-site stainless steel duct connection, used to limit and guide the splicing and welding of two duct plates 11, comprising: a base 1; an adjustment module 2, vertically fixed on one side of the base 1; a limiting module 3, vertically fixed on the adjustment module 2, the limiting module 3 having a first suction head 31 and a second suction head 32 that can be adjusted horizontally and vertically, and a first adjustment unit 33 and a second adjustment unit 34 that can adjust the sliding of the first suction head 31 and the second suction head 32 respectively; the included angle between the first suction head 31 and the second suction head 32 is set at a right angle; and a welding module 4, which is attached to the outside of the duct plate 11, the welding module 4 having a welding head 41 that can weld the splice seam of the two duct plates 11 and a guiding element 42 that can guide the welding head 41 to always slide along the center of the weld seam.

[0029] The duct plate 11 is an L-shaped strip formed by bending along the longitudinal direction, and each plate consists of two perpendicularly intersecting plates. When two L-shaped duct plates 11 are attached to each other and welded along the edges, a stainless steel duct body with a closed rectangular cross-section can be formed.

[0030] The adjustment module 2 and the limiting module 3 are symmetrically arranged in two groups along the axis of the base 1, facing each other, to achieve independent support and synchronous limiting of the two duct plate 11. When it is necessary to assemble and weld the duct plate 11, the operator first adjusts the first adjustment unit 33 and the second adjustment unit 34 according to the transverse and longitudinal dimensions of the plate to be welded, so that the first suction head 31 and the second suction head 32 move to the preset suction position. Then, the duct plate 11 to be welded is placed at the corresponding suction head position and fixed by suction head adsorption, thereby completing the stable limiting of a single duct plate 11.

[0031] Next, another duct panel 11 is placed on the opposite limiting module 3, and pre-positioned adsorption is achieved through the same suction mechanism. At this time, the two panels can form a precise angular correction and seam limiting state before welding, ensuring that the welded joint is tightly fitted and the splicing angle is consistent.

[0032] Subsequently, the welding module 4 is placed horizontally along the preset welding trajectory, and the guide element 42 is activated to insert into the splicing gap between the two plates. The guide element 42 dynamically guides the welding head 41, ensuring that the welding head 41 always slides along the center line of the splice during the operation, thereby ensuring that the weld is centered, has uniform penetration, and a neat appearance.

[0033] Through the coordinated operation of adjustment module 2, limit module 3 and guide element 42, high-precision limit correction of duct plate 11 can be achieved before welding, and dynamic guidance of weld seam centering can be achieved during welding, effectively preventing plate misalignment and thermal deformation problems, and significantly improving weld seam uniformity and assembly accuracy.

[0034] To further ensure the stability of the welding between the two duct plates, it is possible to pre-weld limiting welding points at both ends of the joint to prevent misalignment during subsequent welding.

[0035] See Figure 7 As shown: The first adjustment unit 33 is provided with a first guide rod 331 and a first telescopic rod 332 telescopically disposed at the front end of the first guide rod 331, and a first locking knob 333 capable of locking the first telescopic rod 332; the first suction head 31 is vertically fixedly disposed at the front end of the first telescopic rod 332 in a vertical state.

[0036] When it is necessary to adjust the lateral limiting distance of the first suction head 31, first loosen the first locking knob 333 to release the locking state of the first telescopic rod 332. The operator, according to the actual width requirement of the duct plate 11, grasps the handle of the first telescopic rod 332 and slowly pulls or pushes it laterally to move the first suction head 31 to the required preset limiting position. After the position adjustment is complete, tighten the first locking knob 333 to re-lock the third telescopic rod 4212, completing the spacing setting.

[0037] By cooperating with the third telescopic rod 4212 and the locking knob, the distance between the suction heads can be quickly adjusted and accurately positioned to meet the welding requirements of duct plates 11 of different widths and specifications, thereby improving the versatility and adjustment flexibility of the device, while ensuring the stability and reliability of the limit mechanism.

[0038] See Figure 7 As shown: The second adjustment unit 34 is provided with a sliding frame 341, a second guide rod 342 vertically arranged on one side of the sliding frame 341, a second telescopic rod 343 telescopically arranged at the front end of the second guide rod 342, and a second locking knob 344 capable of locking the second telescopic rod 343; the second suction head 32 is vertically arranged at the front end of the second telescopic rod 343.

[0039] The second telescopic rod 343 is specifically an L-shaped rod.

[0040] A third locking knob 345, capable of locking the sliding frame 341, is also screwed onto one side of the sliding frame 341.

[0041] When it is necessary to adjust the longitudinal limiting distance of the first suction head 31, firstly, according to the longitudinal dimension of the duct plate 11 to be welded, the sliding frame 341 is horizontally slid, so that the second guide rod 342 and the second telescopic rod 343 are synchronously driven to the preset support position. Then, the third locking knob 345 is tightened to lock the position of the sliding frame 341 to prevent it from shifting in subsequent operations.

[0042] Next, adjust the second telescopic rod 343; after the third telescopic rod 4212 is adjusted to the preset position matching the plate, tighten the second locking knob 344 to fix the spacing. After completing the joint adjustment of the longitudinal and transverse spacing, the horizontal surfaces of the two duct plate 11 to be welded can be adsorbed and fixed by the first suction head 31 and the second suction head 32 respectively, thereby forming a stable and precise limiting state, providing a reliable assembly foundation for welding.

[0043] Through the cooperation of the sliding frame 341, the third telescopic rod 4212 and the multi-stage locking mechanism, the duct plate 11 is precisely limited and adjustable in the longitudinal direction, effectively avoiding misalignment, warping and joint deviation of the plate during the welding process.

[0044] See Figure 7 As shown: The first suction head 31 is composed of a limiting plate 311 and a magnet 312 embedded in the limiting plate 311; multiple magnets 312 are equidistantly arranged along the long side of the limiting plate 311.

[0045] Through the limiting plate 311 and the magnet 312 embedded in the limiting plate 311, when the duct plate 11 is placed on the device, the magnetic adsorption effect on the surface of the limiting plate 311 can achieve rapid adsorption and positioning of the plate in a very short time, avoiding the cumbersome adjustment problem of traditional mechanical block-type limiting structures. At the same time, the limiting plate 311 provides longitudinal support and constraint to the edge of the plate, preventing deformation such as bending and bulging of the thin plate due to uneven force during welding heat input or positioning.

[0046] By combining the limiting plate 311 with the embedded magnet 312, the duct plate 11 is quickly adsorbed, fixed and precisely positioned, which significantly improves the clamping efficiency and positioning accuracy, while effectively preventing the plate from deforming.

[0047] To ensure a stable clamping, the embedded magnet 312 on the limiting plate 311 can be energized to generate magnetic attraction, thereby achieving rapid adsorption and fixation of the plate.

[0048] See Figure 6 As shown: The adjustment module 2 is provided with a slide rail 21 and a slider 22 slidably disposed on the slide rail 21; the slide rail 21 is fixedly disposed vertically on one side of the base 1; the slider 22 is slidably disposed on the slide rail 21; the first adjustment unit 33 is vertically disposed on the slide rail 21.

[0049] Since the limiting module 3 is vertically installed above the adjusting module 2, when continuous welding of duct panels 11 of different lengths or multiple sections is required, the operator only needs to slide and adjust the limiting module 3 along the slide rail 21 to quickly change the limiting position without re-clamping, so that the device can adapt to the splicing requirements of panels of different specifications.

[0050] See Figure 2 and Figure 3 As shown: The welding module 4 further includes a drive unit 43 capable of driving the welding head 41 to slide horizontally along the weld seam and a third adjustment unit 44 capable of dynamically adjusting the welding distance between the welding head 41 and the weld seam; the welding head 41 is movably disposed at the drive end of the drive unit 43 through the third adjustment unit 44; the welding head 41 is movably disposed at the front end of the third adjustment unit 44.

[0051] The drive unit 43 is specifically a lead screw slide. When welding is required at the joint of two duct panels 11, the welding head 41 is first adjusted to the preset welding spacing position by the third adjustment unit 44, and the guide end of the guide element 42 is placed into the joint gap. Subsequently, the drive unit 43 is activated, the lead screw rotates and drives the slide bar to slide smoothly in the horizontal direction, so that the welding head 41 moves along the weld direction and maintains the centered operation of the welding path under the constraint of the guide element 42.

[0052] Driven by the lead screw slide, the welding head 41 automatically slides and guides along the weld seam, improving the stability and consistency of the weld seam, while reducing human error and improving welding quality.

[0053] See Figure 3 As shown: The welding module 4 also includes a connecting frame and an electromagnet 45 that can quickly attract the drive unit 43 to the outside of the duct plate 11; the electromagnet 45 is horizontally fixed to the lower surface of the drive unit 43 through the connecting frame.

[0054] The electromagnet 45, once energized, can instantly adhere to the outer wall of the duct plate 11, enabling rapid clamping and positioning of the welding module 4. When the weld position needs to be changed, the operator only needs to remove the welding module 4 and re-fix it to the new welding position using the electromagnetic adsorption function, without the need for mechanical fasteners. Simultaneously, to enhance the stability of the welding module 4 during operation, its bottom cooperates with the second suction head 32 to form a double-point support structure, effectively improving the overall suction strength and preventing tilting, shaking, or slippage during welding.

[0055] Through the electromagnetic attraction structure and dual-point support design, the welding module 4 is quickly positioned and stably attracted, which not only facilitates operation and position switching, but also significantly improves the support strength and posture stability during welding.

[0056] See Figure 2 , Figure 5 and Figure 8 As shown: The third adjustment unit 44 includes a second limiting seat 441, an adjusting rod 442, a hinge joint 443, a hinge seat 444, a reset motor 445, and a fourth locking knob 446; the second limiting seat 441 is fixedly disposed on the driving end of the driving unit 43 and the fourth locking knob 446 is screwed onto its side wall; the adjusting rod 442 is slidably disposed within the second limiting seat 441; the hinge joint 443 is fixedly disposed at the front end of the adjusting rod 442; the hinge seat 444 is fixedly disposed at the end of the welding head 41 and is hinged to the hinge joint 443; the reset motor 445 is fixedly disposed on one side of the hinge joint 443 and passes through the hinge joint 443 to be connected to the hinge seat 444 in a transmission connection.

[0057] When the welding position of the welding head 41 needs to be adjusted, the operator first loosens the fourth locking knob 446, adjusts the horizontal angle and height of the welding head 41 and its support rod to align the welding position of the welding head 41 with the center of the weld, and inserts the guide element 42 into the joint gap. After adjustment, the fourth locking knob 446 is tightened to fix the position of the welding head 41. The welding head 41 is connected to the hinge joint 443 through the hinge seat 444, and has a certain degree of axial freedom. When the guide element 42 provides dynamic guidance during the welding process, it can drive the welding head 41 to achieve micro-oscillation and angle self-adaptation, thereby always maintaining consistency with the weld trajectory. The reset motor 445 is used to limit the orientation of the welding head 41 in the non-welding state.

[0058] By combining the articulated welding head 41 structure with the limiting and locking mechanism, the welding head 41 can be precisely positioned and adaptively dynamically welded, ensuring that the weld is centered and has uniform penetration, and avoiding welding offset problems caused by clamping errors or thermal deformation.

[0059] See Figure 2 and Figure 4 As shown: The guide element 42 is provided with a third guide rod 421 that can be dynamically inserted into the weld and a spring 422 that can always elastically drive the axis of the third guide rod 421 into the weld.

[0060] The third guide rod 421 is composed of a first limiting seat 4221, a third telescopic rod 4212, a flange 4213, and a tapered correction part 4214 connected coaxially in sequence. The first limiting seat 4221 is used to limit the guiding angle of the third guide rod 421 and provide axial sliding support. A spring 422 is sleeved on the outer periphery of the third telescopic rod 4212, and the two ends of the spring 422 abut against the bottom of the first limiting seat 4221 and the flange 4213 respectively to provide a constant elastic thrust. The tapered correction part 4214 is disposed at the front end of the third guide rod 421.

[0061] During welding, the tapered correction part 4214 is embedded in the splice gap and automatically centers under the continuous elastic force of the spring 422, ensuring that its guide section always remains in contact with the weld. Since the third guide rod 421 is fixedly connected to the welding head 41 at the same angle, when the weld trajectory or gap changes slightly due to working conditions, the tapered correction part 4214 can achieve slight oscillation and automatic following under elastic action, thereby guiding the welding head 41 to synchronously correct its position and ensuring that the welding head 41 always moves along the center line of the weld. Because the conical straightening part 4214 is long and conical, and is continuously pressed against the weld seam by the spring 422, when the conical straightening part 4214 is inserted into the weld seam by the spring 422, the long and conical conical straightening part 4214 will adaptively adjust the insertion depth according to the current weld seam width, so that the conical straightening part 4214 is always centered in the weld seam, and will dynamically adjust the insertion depth of the conical straightening part 4214 according to the weld seam width during the subsequent welding process, thus ultimately achieving the purpose of real-time centering guidance of the welding head 41.

[0062] Through the coordinated operation of the first limiting seat 4221, the spring 422, the third telescopic rod 4212, and the conical correction part 4214, the elastic guidance and automatic centering correction function of the welding head 41 are realized. It can compensate for weld deviation in real time during dynamic welding, ensure uniform weld formation and consistent penetration depth, and greatly improve welding accuracy and automation level.

[0063] A welding method for on-site stainless steel duct connection, applied to a welding auxiliary device for on-site stainless steel duct connection, includes the following steps: S1: Based on the design dimensions of the duct to be welded, the adjustment module 2 and the limiting module 3 are driven to move. The horizontal and vertical limiting distances are set by adjusting the first telescopic rod 332 and the second telescopic rod 343. Then, the two duct plates 11 are respectively adsorbed and fixed by the first suction head 31 and the second suction head 32, so that the splicing edges of the two duct plates 11 are kept parallel. S2: After the two duct plates 11 are fixed, the edge of the duct plate 11 is corrected by the limiting module 3 to keep the splicing gap constant. If multiple duct sections need to be welded continuously, the limiting module 3 is slid along the slide rail 21 to achieve continuous positioning of different welding areas. At this time, the two duct plates 11 form a rectangular tube pre-assembly state before welding, with uniform weld spacing and tight splicing edges. S3: Place the welding module 4 at the pre-welding position outside the duct, activate the electromagnet 45 to attract it, so that the welding module 4 is firmly attached to the surface of the duct plate 11; adjust the angle and height of the welding head 41 so that the center line of the weld of the welding head 41 is aligned with the joint of the plate; insert the conical correction part 4214 of the guide element 42 into the joint gap, and use the spring 422 to push the conical correction part 4214 to automatically center and fit with the weld, forming the initial state of welding guidance; S4: The drive unit 43 is started, which drives the welding head 41 to slide horizontally along the weld direction. During the welding process, the welding head 41 achieves dynamic adaptive centering movement under the guidance of the guide element 42. Even if the weld is slightly offset due to thermal expansion and contraction or micro deformation of the workpiece, the conical correction part 4214 will automatically adjust the angle so that the welding trajectory of the welding head 41 is always kept on the center line of the weld until the welding is completed.

[0064] This invention not only enables precise splicing between two duct plates but also allows for efficient welding at the splice joint.

[0065] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A welding auxiliary device for on-site stainless steel duct connection, used to limit and guide the splicing and welding of two duct plates, comprising: Base; The adjustment module is vertically fixed to one side of the base; A limiting module is vertically fixed on the adjustment module. The limiting module is provided with a first suction head and a second suction head that can be adjusted horizontally and vertically, and a first adjustment unit and a second adjustment unit that can respectively adjust the sliding of the first suction head and the second suction head; the included angle between the first suction head and the second suction head is set at a right angle. A welding module is installed on the outside of the duct sheet. The welding module is equipped with a welding head that can weld the joint of two duct sheets and a guiding element that can guide the welding head to slide along the center of the weld.

2. The welding auxiliary device for on-site stainless steel duct connection according to claim 1, characterized in that, The first adjustment unit is provided with a first guide rod, a first telescopic rod telescopically disposed at the front end of the first guide rod, and a first locking knob capable of locking the first telescopic rod; The first suction head is vertically fixed to the front end of the first telescopic rod.

3. The welding auxiliary device for on-site stainless steel duct connection according to claim 2, characterized in that, The second adjustment unit includes a sliding frame, a second guide rod vertically disposed on one side of the sliding frame, a second telescopic rod telescopically disposed at the front end of the second guide rod, and a second locking knob capable of locking the second telescopic rod; The second suction head is vertically positioned at the front end of the second telescopic rod.

4. The welding auxiliary device for on-site stainless steel duct connection according to claim 1, characterized in that, The first suction head consists of a limiting plate and a magnet embedded in the limiting plate; Multiple magnets are equidistantly arranged along the long side of the limiting plate.

5. The welding auxiliary device for on-site stainless steel duct connection according to claim 1, characterized in that, The adjustment module is equipped with a slide rail and a slider that is slidably disposed on the slide rail; The slide rail is fixedly installed vertically on one side of the base; The slider is slidably mounted on the slide rail; The first adjustment unit is vertically mounted on the slide rail.

6. The welding auxiliary device for on-site stainless steel duct connection according to claim 1, characterized in that, The welding module also includes a drive unit capable of driving the welding head to slide horizontally along the weld seam and a third adjustment unit capable of dynamically adjusting the welding distance between the welding head and the weld seam. The welding head is movably positioned at the drive end of the drive unit via the third adjustment unit; The welding head is movably positioned at the front end of the third adjustment unit.

7. The welding auxiliary device for on-site stainless steel duct connection according to claim 6, characterized in that, The welding module also includes a connecting frame and an electromagnet that can quickly attach the drive unit to the outside of the duct plate. The electromagnet is horizontally fixed to the lower surface of the drive unit via the connecting frame.

8. A welding auxiliary device for on-site stainless steel duct connection according to claim 6, characterized in that, The third adjustment unit includes a second limiting seat, an adjustment rod, a hinge joint, a hinge seat, a reset motor, and a fourth locking knob; The second limiting seat is fixedly disposed on the driving end of the driving unit and a fourth locking knob is screwed onto its side wall; The adjusting rod is slidably disposed within the second limiting seat; The hinge joint is fixedly disposed at the front end of the adjusting rod; The hinge seat is fixedly disposed at the end of the welding head and hinged to the hinge joint; The reset motor is fixedly mounted on one side of the hinge joint and passes through the hinge joint to be connected to the hinge seat in a transmission manner.

9. A welding auxiliary device for on-site stainless steel duct connection according to claim 1, characterized in that, The guiding element is provided with a third guide rod that can be dynamically inserted into the weld and a spring that can always elastically drive the axis of the third guide rod into the weld.

10. A welding method for on-site stainless steel duct connection, applied to a welding auxiliary device for on-site stainless steel duct connection, comprising the following steps: S1: Based on the design dimensions of the duct to be welded, the adjustment module and the limiting module are driven to move. By adjusting the first telescopic rod and the second telescopic rod, the horizontal and vertical limiting distances are set. Then, the first suction head and the second suction head are used to adsorb and fix the two duct plates respectively, so that the splicing edges of the two duct plates are kept parallel. S2: After the two duct panels are fixed, the edge of the duct panels is corrected by the limiting module to keep the splicing gap constant. If multiple duct sections need to be welded continuously, the limiting module is slid along the slide rail to achieve continuous positioning of different welding areas. At this time, the two duct panels form a rectangular tube pre-assembly state before welding, with uniform weld spacing and tight splicing edges. S3: Place the welding module at the pre-welding position on the outside of the duct, activate the electromagnet to attract it, and make the welding module firmly attached to the surface of the duct plate; adjust the angle and height of the welding head to align the center line of the weld with the joint of the plate; insert the tapered correction part of the guide element into the joint gap, and use the spring force to make the tapered correction part automatically center and fit with the weld, forming the initial state of welding guidance; S4: The drive unit starts, driving the welding head to slide horizontally along the weld direction. During the welding process, the welding head achieves dynamic adaptive centering movement under the guidance of the guide element. Even if the weld is slightly offset due to thermal expansion and contraction or micro deformation of the workpiece, the conical correction part will automatically adjust the angle to keep the welding trajectory of the welding head on the center line of the weld until the welding is completed.

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