Local sweat soldering device for curtain wall aluminum plate

Abstract

The invention relates to the technical field of metal welding equipment, discloses a local hot melt welding device for a curtain wall aluminum plate, and aims to solve the problems that in the prior art, when a thin aluminum plate and a reinforcing rib are welded, fusion penetration, collapse and insufficient fusion depth are prone to occurring, and consequently the connection strength is not high. The device comprises a welding operation table, a supporting back plate, a clamping mechanism, a front limiting mechanism and a rear limiting mechanism, the front limiting mechanism and the rear limiting mechanism are arranged on the two sides of a welding gun, and the front limiting mechanism is provided with an inclined connecting part inserted into a welding seam and an arc-shaped bottom supporting strip and used for supporting a molten pool to prevent falling and guiding welding fluid to deeply fill so as to increase the combination area; the rear limiting mechanism trims a welding seam through the side edge of the notch and supplies protective gas, oxidation is prevented, heat dissipation is assisted, meanwhile, the device is provided with an angle limiting mechanism, the inclination angle of a welding gun can be accurately controlled, excessive heat concentration is avoided, the welding operation difficulty is reduced through structure optimization, and the welding efficiency is improved. And the welding seam quality, the connection strength and the safety and durability of the curtain wall structure are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of metal welding equipment technology, and in particular to a device for local hot-melt welding of aluminum panels for curtain walls. Background Technology

[0002] Metal welding equipment refers to a complete set of devices designed to realize metal welding processes. Its core function is to provide and precisely control the concentrated heat source and necessary filler material required for the welding process. Under a protective medium, it locally heats the joint of the metal parts to be joined to a molten or plastic state, applies pressure to fuse them, and forms a strong and permanent connection after cooling. It typically consists of key components such as a welding power source, welding torch or welding gun, wire feeding mechanism, gas system, and control system. It is widely used in manufacturing, construction, and maintenance fields and is an indispensable basic equipment in modern industry.

[0003] In the welding of aluminum curtain wall panels, the thinness of the material and the high thermal conductivity of aluminum result in a narrow control window for welding heat input. This easily leads to instability issues in the weld pool, typically manifested as the weld pool sagging under gravity, resulting in defects such as weld burn-through or collapse. This not only affects the flatness of the component's appearance but also weakens its structural rigidity. Furthermore, current hot-melt welding methods used between aluminum panels and stiffeners typically form weld beads on the surface of the interface, preventing the joint area from reaching an ideal state. This, to some extent, restricts further improvement in the connection strength between the two. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that, due to the thin plate characteristics and the high thermal conductivity of aluminum, aluminum curtain wall panels are prone to defects such as melt-through and collapse during welding, and the connection strength between them and the reinforcing ribs is difficult to improve due to insufficient penetration. To address this, we propose a device for local hot-melt welding of aluminum curtain wall panels.

[0005] To achieve the above objectives, this application adopts the following technical solution: a device for local hot-melt welding of aluminum panels for curtain walls, comprising: a welding device operating table, a supporting back plate installed on the top of the welding device operating table, a clamping mechanism installed on the side of the supporting back plate, and an aluminum plate to be welded attached to the front of the supporting back plate, an aluminum plate reinforcing rib fitted with a gap on the side of the aluminum plate to be welded away from the supporting back plate, a welding torch arranged above the aluminum plate reinforcing rib, and a front limiting mechanism and a rear limiting mechanism respectively arranged on both sides of the welding torch, the front limiting mechanism being located in the direction of travel of the welding torch. The rear limiting mechanism is located behind the welding torch in the direction of travel. The front limiting mechanism includes a first limiting plate, and a first venting groove is provided on the side of the first limiting plate near the aluminum plate to be welded. An air inlet vertical plate is provided on one side of the first venting groove, and an inverted triangular block is provided on the other side of the first venting groove. A T-shaped stop is fixedly connected to the bottom end of the air inlet vertical plate. An inclined connecting part is fixedly connected to the bottom end of the T-shaped stop, and a bottom support strip is fixedly connected to the bottom end of the inclined connecting part. The inclined connecting part and the bottom support strip are inserted into the weld seam between the aluminum plate to be welded and the aluminum plate reinforcing rib.

[0006] Preferably, the air intake vertical plate is inclined outward to create a funnel-shaped opening on the side of the first air vent that communicates with the first air vent.

[0007] Preferably, the bottom end of the inverted triangular block is provided with an exhaust port, and the exhaust port is connected to the first ventilation groove. The bottom end of the exhaust port is provided with a weld guide strip, and the weld guide strip is fixedly connected to the first limiting plate. The bottom end of the weld guide strip is fixedly connected with an inclined guide strip.

[0008] Preferably, the cross-section of the bottom support strip is an arc shape with the arc surface facing upwards. The bottom support strip is used to support the molten pool from the bottom to prevent the molten pool from falling excessively. The width of the bottom support strip is the same as the width of the inclined connection part, the weld guide strip, and the inclined guide strip.

[0009] Preferably, the rear limiting mechanism includes a second limiting plate, and a second venting groove is provided on the side of the second limiting plate near the aluminum plate to be welded, and the top of the second venting groove is connected to an air supply mechanism.

[0010] Preferably, the second limiting plate has a plurality of air outlets at equal intervals on the side near the welding gun, and the opening size of the air outlets gradually increases from top to bottom, and the air outlets are connected to the second ventilation groove.

[0011] Preferably, the second limiting plate has a notched side near the corner of the aluminum plate to be welded and the aluminum plate reinforcing rib, and the notched side is used to trim the top of the molten pool.

[0012] Preferably, an angle limiting mechanism is installed between the front limiting mechanism and the rear limiting mechanism. The angle limiting mechanism is used to limit the tilt angle of the welding torch. The angle limiting mechanism includes a support shaft, and the support shaft is fixedly connected to the welding torch. A fixing ring is rotatably connected to the end of the support shaft, and the fixing ring is fixedly connected to the side of the second limiting plate.

[0013] Preferably, the fixed ring has a sliding groove inside, a thin sliding pin is slidably connected inside the sliding groove, a coarse limiting pin is fixedly connected to the outer end of the thin sliding pin, and a plurality of limiting slots are opened on the outer wall of the fixed ring, with the coarse limiting pin inserted into the limiting slots.

[0014] Preferably, a spring is fixedly connected to the inner end of the thin sliding pin, and a limit baffle is provided on the outside of the spring. Two sets of limit baffles are provided inside the fixed ring, and a movable stop is provided between the two sets of limit baffles. The movable stop is fixedly connected to the support shaft.

[0015] The technical effects and advantages of this invention are as follows:

[0016] This invention incorporates an angle-limiting mechanism that restricts the movement of the movable stop block within the included angle space enclosed by two sets of limiting baffles. This precisely limits the tilt angle of the welding torch, significantly reducing reliance on the operator's individual skills and experience. It ensures the accuracy and consistency of the welding heat source's position and heat distribution, preventing excessive heat concentration in the thin aluminum base material due to angle deviations. This fundamentally prevents defects such as localized overheating, molten pool sagging, and weld burn-through. Simultaneously, the low-temperature protective gas supplied by the rear limiting mechanism, with its C-shaped outlet guiding the gas across the welding area, not only displaces air to prevent molten pool oxidation, nitriding, and porosity defects, but also assists in heat dissipation through forced convection, further suppressing heat input from spreading to the base material. This design significantly reduces the risk of deformation and burn-through in thin-walled aluminum plates, ensuring aesthetically pleasing weld formation and structural integrity. The device employs vertical welding, incorporating a front limiting mechanism inserted into the inclined connection of the weld, weld guide strips, and a bottom support strip. This not only prevents excessive molten pool sagging through the bottom support strip but also creates a pre-set gap between the aluminum plate and the reinforcing ribs, guiding the weld molten metal to penetrate deeply, increasing the effective bonding area, and enhancing the static load-bearing capacity and fatigue resistance of the contact point. Simultaneously, the notch on the side of the rear limiting mechanism can scrape away defects such as excessive weld excess and weld beads, ensuring the surface flatness of the components. Ultimately, this enhances the stability and durability of the curtain wall connection structure, ensuring its safety under long-term wind loads and vibrations. Attached Figure Description

[0017] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0018] Figure 1 This is a three-dimensional structural diagram of the entire invention;

[0019] Figure 2 This is a three-dimensional structural diagram of the welding torch part of the present invention;

[0020] Figure 3 This is a three-dimensional structural diagram of the front limiting mechanism, rear limiting mechanism, and angle limiting mechanism of the present invention;

[0021] Figure 4 This is a three-dimensional structural diagram of the rear limiting mechanism of the present invention;

[0022] Figure 5 This is a three-dimensional structural diagram of the front limiting mechanism of the present invention;

[0023] Figure 6 This is a three-dimensional structural schematic diagram of the front limiting mechanism of the present invention in a side view.

[0024] Figure 7 This is a three-dimensional structural diagram of the rear limiting mechanism of the present invention in the state of being attached to the aluminum plate reinforcing rib.

[0025] Figure 8 This is a schematic diagram of the internal structure of the angle-limiting mechanism of the present invention.

[0026] Legend: 1. Welding device operating table; 2. Support back plate; 3. Clamping mechanism; 4. Aluminum plate to be welded; 5. Aluminum plate reinforcing rib; 6. Welding torch; 7. Front limiting mechanism; 8. Rear limiting mechanism; 9. Angle limiting mechanism; 701. First limiting plate; 702. First vent groove; 703. Air inlet vertical plate; 704. Inverted triangular block; 705. T-shaped stop block; 706. Exhaust port; 707. Weld guide strip; 70 8. Inclined guide strip; 709. Inclined connecting part; 710. Bottom support strip; 801. Second limiting plate; 802. Second vent groove; 803. Notch side; 804. Air outlet; 901. Support shaft; 902. Fixing ring; 903. Sliding groove; 904. Fine sliding pin; 905. Coarse limiting pin; 906. Limiting socket; 907. Spring; 908. Limiting baffle; 909. Movable stop block. Detailed Implementation

[0027] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0028] When welding aluminum panels and reinforcing ribs of a curtain wall using welding torch 6, maintaining a stable and appropriate angle between the welding torch 6 and the weld seam is a critical operational requirement. In practice, if the operator's skill is insufficient or their posture is unstable, causing a deviation in the tilt angle of the welding torch 6, it will directly change the way the heat from the welding torch 6 is applied and the distribution area. This improper angle will cause excessive heat concentration on the aluminum plate rather than at the root of the weld seam. Combined with the inherent characteristics of aluminum—high thermal conductivity and low heat capacity of thin plates—localized heat accumulation is easily caused in the aluminum base material area. This area overheats, causing the melting range to expand, and the surface tension of the molten pool cannot support its weight, ultimately leading to the molten pool sagging, burning through the aluminum plate, and forming welding defects. To solve this technical problem, this application makes the following improvements:

[0029] Reference Figure 1 , Figure 3 and Figure 8 As shown, the present invention provides a technical solution: a device for local hot-melt welding of aluminum panels for curtain walls, comprising: a welding device operating table 1, a support back plate 2 installed on the top of the welding device operating table 1, a clamping mechanism 3 installed on the side of the support back plate 2, and an aluminum plate 4 to be welded attached to the front of the support back plate 2. An aluminum plate reinforcing rib 5 is fitted with the side of the aluminum plate 4 away from the support back plate 2 with a gap. A welding torch 6 is arranged above the aluminum plate reinforcing rib 5. A front limiting mechanism 7 and a rear limiting mechanism 8 are respectively arranged on both sides of the welding torch 6. The front limiting mechanism 7 includes a first limiting plate 701, and the rear limiting mechanism 8 includes a second limiting plate 801. The first limiting plate 701 and the second limiting plate 801 are both set in the shape of right-angled triangles. During welding, their vertical right-angled sides are attached to the surface of the aluminum plate 4 to be welded, and their horizontal right-angled sides are attached to the upper surface of the aluminum plate reinforcing rib 5 and slide along it. An angle limiting mechanism 9 is installed between the front limiting mechanism 7 and the rear limiting mechanism 8. The angle limiting mechanism 9 is used to limit the angle of the aluminum plate 4 to be welded. The tilt angle of the welding torch 6 is limited. The angle limiting mechanism 9 includes a support shaft 901, which is fixedly connected to the welding torch 6. A fixing ring 902 is rotatably connected to the end of the support shaft 901, and the fixing ring 902 is fixedly connected to the side of the second limiting plate 801. A sliding groove 903 is provided inside the fixing ring 902. A thin sliding pin 904 is slidably connected inside the sliding groove 903, and a coarse limiting pin is fixedly connected to the outer end of the thin sliding pin 904. 905, the outer wall of the fixed ring 902 is provided with several limiting slots 906, the coarse limiting pin 905 is inserted into the limiting slot 906, the inner end of the fine sliding pin 904 is fixedly connected to the spring 907, and the outside of the spring 907 is provided with a limiting baffle 908. There are two sets of limiting baffles 908 inside the fixed ring 902, and a movable stop 909 is provided between the two sets of limiting baffles 908. The movable stop 909 is fixedly connected to the support shaft 901.

[0030] Please see Figure 2 and Figure 8As shown, a certain angled space is formed between the two sets of limiting baffles 908, enclosing the movable stop 909 within this angled space. This space restricts the range of motion of the movable stop 909. Since the movable stop 909 rotates together with the support shaft 901, the angle that the support shaft 901 can rotate is limited. This keeps the angle of the welding torch 6 within a safe range, effectively ensuring the accuracy and consistency of the welding heat source's position and heat distribution. It avoids excessive heat concentration on the thin aluminum base material due to angular deviations, thus preventing defects such as localized overheating, molten pool sagging, and weld burn-through. This not only ensures the aesthetic appearance of the weld and the structural integrity of the component but also reduces reliance on the operator's individual skills and experience, improving the stability and repeatability of the process, thereby contributing to a comprehensive increase in production efficiency and product first-pass yield.

[0031] For different aluminum plates, when it is necessary to adjust the tilting angle range of the welding torch 6, simply pull the coarse limiting pin 905 outward to disengage it from the limiting socket 906. Then slide it along the sliding groove 903 to adjust the position of the limiting baffle 908. After sliding to the appropriate position, release the coarse limiting pin 905. Under the elastic force of the spring 907, the coarse limiting pin 905 will be inserted into the corresponding limiting socket 906 for limiting.

[0032] In existing technologies, the welding of aluminum panels and reinforcing ribs in curtain walls typically employs a flat welding process, with the aluminum panel directly beneath the molten pool. Due to the thinness of the aluminum panels and the excellent thermal conductivity of aluminum, heat dissipates rapidly from the weld zone during welding, easily leading to overheating of the base material. The overheated molten pool, due to the low density and high fluidity of aluminum, is prone to sagging or even runoff under gravity, resulting in defects such as weld burn-through or back-side collapse. These defects not only compromise the surface smoothness and aesthetics of the component but also significantly weaken its structural rigidity by reducing the effective load-bearing cross-section, ultimately affecting the safety and durability of the curtain wall system. To address this technical problem, this application proposes the following improvements:

[0033] Please see Figure 3 and Figure 4As shown, the front limiting mechanism 7 is located in front of the welding torch 6 in the direction of travel, and the rear limiting mechanism 8 is located behind the welding torch 6 in the direction of travel. A second venting groove 802 is provided on the side of the second limiting plate 801 near the aluminum plate 4 to be welded, and the top of the second venting groove 802 is connected to a gas supply mechanism. Several air outlets 804 are equally spaced on the side of the second limiting plate 801 near the welding torch 6, and the opening size of the air outlets 804 gradually increases from top to bottom. The air outlets 804 are connected to the second venting groove 802. The low-temperature protective gas supplied by the gas supply mechanism enters the interior of the second venting groove 802. The cross-section of the air outlet 804 is C-shaped, and the opening faces the aluminum plate 4 to be welded, forming a venting system together with the outer surface of the aluminum plate 4 to be welded. The gas inside the second vent 802 flows outward through each vent, and the outlet 804 points towards the front limiting mechanism 7, so that the protective gas sweeps across the surface of the aluminum plate 4 to be welded above the welding area and blows forward to the front limiting mechanism 7. This airflow can not only effectively displace air and prevent the molten pool and high-temperature heat-affected zone from being contaminated by oxygen and nitrogen, thereby avoiding defects such as oxidation, nitriding and porosity; at the same time, it can also carry away some of the heat above the welding area of ​​the aluminum plate 4 through forced convection, playing an auxiliary role in heat dissipation, which helps to suppress the excessive diffusion of heat input to the base material. Especially for thin-walled aluminum plates, it can significantly reduce the heat load in the weld area and reduce the tendency of deformation and burn-through caused by overheating.

[0034] Please see Figure 5 and Figure 6 As shown, a first venting groove 702 is provided on the side of the first limiting plate 701 near the aluminum plate 4 to be welded. An air inlet vertical plate 703 is provided on one side of the first venting groove 702. The air inlet vertical plate 703 is inclined outward to create a funnel-shaped opening on the side of the first venting groove 702 that communicates with the first venting groove 702. The opening faces the rear limiting mechanism 8 and is used to receive the protective gas blown out from the air outlet 804 that sweeps across the surface of the aluminum plate 4 to be welded. An inverted triangular block 704 is provided on the other side of the first venting groove 702. An exhaust port 706 is provided at the bottom of the inverted triangular block 704 and is connected to the first venting groove 702. The inverted triangular block 704 creates an inclined inner wall on the inner side of the first ventilation slot 702. When the air intake vertical plate 703 enters the first ventilation slot 702 vertically at the opening, the inclined inner wall acts as a natural buffer and guide surface, which can decompose the violent vertical impact force of the airflow into a tangential force along the wall surface, thereby significantly weakening its kinetic energy and playing an effective buffering and deceleration role. At the same time, the inclined surface will smoothly guide the airflow and transform it into a downward flow. The bottom end of the intake vertical plate 703 is fixedly connected to a T-shaped baffle 705. The downward flow of airflow is blocked and guided by the horizontal direction of the T-shaped baffle 705 and flows forward from the exhaust port 706.

[0035] Please see Figure 6As shown, the bottom end of the T-shaped block 705 is fixedly connected to an inclined connecting part 709, and the bottom end of the inclined connecting part 709 is fixedly connected to a bottom support strip 710. The bottom end of the exhaust port 706 is provided with a weld guide strip 707, and the weld guide strip 707 is fixedly connected to the first limiting plate 701. The bottom end of the weld guide strip 707 is fixedly connected to an inclined guide strip 708. The inclined connecting part 709, the weld guide strip 707, and the inclined guide strip 708 separate the gap between the aluminum plate reinforcing rib 5 and the aluminum plate 4 to be welded. The enclosure forms an upward airflow channel that is connected to the exhaust port 706. Since the exhaust port 706 is the main outlet of the airflow, the airflow discharged from the inside of the first ventilation groove 702 will form at the exhaust port 706. In the high-speed flow area, a negative pressure zone with a pressure lower than the external atmospheric pressure will be formed near the exhaust port 706 corresponding to the high-speed airflow. The airflow channel formed by the inclined connecting part 709 and the weld guide strip 707 is directly connected to this negative pressure zone. Therefore, the negative pressure will generate suction on the airflow in the airflow channel. At the same time, the airflow in the airflow channel is close to the molten pool area, where the temperature is higher and there is an upward trend. Thus, under the combined effect of the negative pressure and the upward trend of the hot airflow, the airflow in the airflow channel is driven to flow towards the exhaust port 706 and finally discharged from the exhaust port 706. This outward airflow will carry away some of the welding heat and play an auxiliary role in heat dissipation for the molten pool and the surrounding high-temperature area, which helps to suppress the risk of melt-through and collapse caused by overheating of the aluminum plate.

[0036] The inclined connecting part 709 and the bottom support strip 710 are inserted into the weld seam between the aluminum plate 4 to be welded and the aluminum plate reinforcing rib 5. The cross-section of the bottom support strip 710 is an arc shape with the arc surface facing upwards. The bottom support strip 710 is used to support the molten pool from the bottom to prevent the molten pool from sagging excessively. The width of the bottom support strip 710 is the same as the width of the inclined connecting part 709, the weld guide strip 707, and the inclined guide strip 708. The inclined connecting part 709, the weld guide strip 707, and the inclined guide strip 708 are inserted between the aluminum plate 4 to be welded and the aluminum plate reinforcing rib 5, creating a gap of a certain width between them. Combined with the vertical structure of this device... In the welding process, the molten pool moves downward under the action of gravity. The vertical welding position can use gravity to guide the welding liquid into the weld seam for filling. Compared with the traditional flow to the aluminum plate, this can effectively prevent the aluminum plate from being pierced by the molten pool. At the same time, the preset gap provides a physical channel for the welding liquid to penetrate deeply, directly increasing the effective bonding area between the aluminum plate and the reinforcing rib. The larger metallurgical bonding surface can bear the load, thereby directly improving the static load-bearing capacity and fatigue resistance of the contact position. This can effectively enhance the stability and durability of the connection structure, which is crucial for ensuring the integrity of the curtain wall system under long-term wind loads and vibrations.

[0037] Please see Figure 7As shown, the second limiting plate 801 is provided with a notched side 803 at the corner of the aluminum plate 4 to be welded and the aluminum plate reinforcing rib 5. The notched side 803 is used to trim the top of the molten pool, which can effectively scrape off surface defects such as excessive excess height, weld beads or undercut caused by the instability of the molten pool. This process can directly give the weld a smooth, uniform and beautiful forming surface, reducing the workload of subsequent grinding.

[0038] Working principle: First, the aluminum plate 4 to be welded is fixed to the front of the support back plate 2 by the clamping mechanism 3, so that the aluminum plate 4 to be welded is in a vertical position. Then, the aluminum plate reinforcing rib 5 to be welded is attached to the surface of the aluminum plate 4 to be welded, and a certain gap is reserved between the two. When welding, the operator holds the welding gun 6 and attaches the vertical right-angled sides of the first limiting plate 701 and the second limiting plate 801 to the vertical surface of the aluminum plate 4 to be welded, and attaches the horizontal right-angled sides to the top surface of the aluminum plate reinforcing rib 5. The welding gun 6 is moved to perform welding with the direction of the front limiting mechanism 7 as the forward direction. At the same time as welding, since the movable stop 909 can only move within the included angle space formed by the two sets of limiting stops 908, the rotation angle of the support shaft 901 can be limited, thereby limiting the included angle between the end of the welding gun 6 and the weld.

[0039] The inclined connecting part 709, the weld guide strip 707, and the inclined guide strip 708 are all inserted into the weld between the aluminum plate reinforcing rib 5 and the aluminum plate to be welded 4, so that a certain gap is maintained between the two, and the molten liquid can flow down into the interior of the weld along the gap, thereby enhancing the stability of the connection between the aluminum plate to be welded 4 and the aluminum plate reinforcing rib 5. The bottom support strip 710 is located below the molten pool and is used to support and limit the downward flowing liquid to prevent it from falling excessively and forming weld beads.

[0040] Simultaneously, the low-temperature protective gas is introduced into the second ventilation groove 802 through the gas supply mechanism at the top of the second ventilation groove 802. Through the diversion and guidance of the outlet 804, it sweeps across the surface of the aluminum plate 4 to be welded above the welding area and enters the interior of the first ventilation groove 702 through the trumpet-shaped opening formed by the air inlet vertical plate 703. It flows downward along the first ventilation groove 702. After flowing to its bottom, it changes direction under the action of the T-shaped baffle 705 and flows outward from the exhaust port 706. At the same time, due to the principle of high flow velocity and low pressure, a negative pressure zone is formed at the exhaust port 706 located below the T-shaped baffle 705. The negative pressure is used to make the airflow in the channel between the inclined connection part 709 and the weld guide strip 707 also flow outward.

[0041] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A device for localized hot-melt welding of aluminum panels for curtain walls, characterized in that, The device includes a welding equipment operating table. A support back plate is mounted on the top of the operating table. Clamping mechanisms are mounted on the sides of the support back plate, and an aluminum plate to be welded is attached to the front of the support back plate. An aluminum plate reinforcing rib is fitted with the side of the aluminum plate away from the support back plate. A welding torch is positioned above the aluminum plate reinforcing rib. A front limiting mechanism and a rear limiting mechanism are respectively provided on both sides of the welding torch. The front limiting mechanism is located in front of the welding torch in the direction of travel, and the rear limiting mechanism is located behind the welding torch in the direction of travel. The front limiting mechanism includes a first limiting plate, and a first venting groove is provided on the side of the first limiting plate near the aluminum plate to be welded. An air intake vertical plate is provided on one side of the first venting groove, and an inverted triangular block is provided on the other side of the first venting groove. A T-shaped stop is fixedly connected to the bottom end of the air intake vertical plate, and an inclined connecting part is fixedly connected to the bottom end of the T-shaped stop. A bottom support strip is fixedly connected to the bottom end of the inclined connecting part. The inclined connecting part and the bottom support strip are inserted into the weld seam between the aluminum plate to be welded and the aluminum plate reinforcing rib.

2. The device for local hot-melt welding of aluminum curtain wall panels according to claim 1, characterized in that: The air intake vertical plate is inclined outward to create a funnel-shaped opening on the side of the first air vent that communicates with the first air vent.

3. The device for local hot-melt welding of aluminum curtain wall panels according to claim 1, characterized in that: The bottom of the inverted triangular block is provided with an exhaust port, which is connected to the first ventilation groove. The bottom of the exhaust port is provided with a weld guide strip, which is fixedly connected to the first limiting plate. The bottom of the weld guide strip is fixedly connected with an inclined guide strip.

4. The device for local hot-melt welding of aluminum curtain wall panels according to claim 1, characterized in that: The cross-section of the bottom support strip is an arc shape with the arc surface facing upward. The bottom support strip is used to support the molten pool from the bottom to prevent the molten pool from falling excessively. The width of the bottom support strip is the same as the width of the inclined connection part, the weld guide strip, and the inclined guide strip.

5. The device for local hot-melt welding of aluminum curtain wall panels according to claim 1, characterized in that: The rear limiting mechanism includes a second limiting plate, and a second venting groove is provided on the side of the second limiting plate near the aluminum plate to be welded, and the top of the second venting groove is connected to an air supply mechanism.

6. The device for local hot-melt welding of aluminum curtain wall panels according to claim 5, characterized in that: The second limiting plate has several air outlets at equal intervals on the side near the welding gun, and the opening size of the air outlets gradually increases from top to bottom. The air outlets are connected to the second ventilation groove.

7. The device for local hot-melt welding of aluminum curtain wall panels according to claim 5, characterized in that: The second limiting plate has a notched side near the corner of the aluminum plate to be welded and the aluminum plate reinforcing rib. The notched side is used to trim the top of the molten pool.

8. The device for local hot-melt welding of aluminum curtain wall panels according to claim 1, characterized in that: An angle limiting mechanism is installed between the front limiting mechanism and the rear limiting mechanism. The angle limiting mechanism is used to limit the tilt angle of the welding gun. The angle limiting mechanism includes a support shaft, and the support shaft is fixedly connected to the welding gun. A fixing ring is rotatably connected to the end of the support shaft, and the fixing ring is fixedly connected to the side of the second limiting plate.

9. The device for local hot-melt welding of aluminum curtain wall panels according to claim 8, characterized in that: The fixed ring has a sliding groove inside, and a thin sliding pin is slidably connected inside the sliding groove. A coarse limiting pin is fixedly connected to the outer end of the thin sliding pin. The outer wall of the fixed ring has several limiting slots, and the coarse limiting pin is inserted into the limiting slots.

10. The device for local hot-melt welding of aluminum curtain wall panels according to claim 9, characterized in that: The inner end of the thin sliding pin is fixedly connected to a spring, and a limit baffle is provided on the outside of the spring. Two sets of limit baffles are provided inside the fixed ring, and a movable stop is provided between the two sets of limit baffles. The movable stop is fixedly connected to the support shaft.

Images