A thin-walled box body welding device and a welding method thereof

Abstract

The present application relates to the field of thin-walled box welding, and particularly relates to a thin-walled box welding device and a welding method thereof. The thin-walled box welding device comprises: an electric rotating disc, a rotating part of which is provided with a limiting and fixing assembly; a fixed frame, which is fixedly connected with the rotating part of the electric rotating disc; a pressing assembly, which is connected with the rotating part of the electric rotating disc and the fixed frame; and a cooling assembly. The limiting and fixing assembly is arranged to quickly position and clamp the base frame, and the multi-directional pressing assembly is arranged to independently press each side plate and top plate, so that each plate is closely attached to the square tube of the framework before welding, and the preset pressing force is maintained through the compression deformation of each elastic telescopic rod, so as to avoid the dislocation or warping of the plate during welding. The heat-conducting ring is arranged to compensate and press the local part of the plate plug welding hole, so as to ensure that the plate plug welding hole area is closely attached to the square tube of the framework, and the welding robot is arranged to form an intelligent welding system to automatically complete the welding.

Description

Technical Field

[0001] This invention relates to the field of thin-walled box welding, and more particularly to a thin-walled box welding apparatus and welding method thereof. Background Technology

[0002] Currently, the body of a maintenance vehicle is typically welded together from a front panel, rear panel, side panels, top panel, and internal frame. In traditional welding methods, the connection between the various panels and the frame often uses intermittent welding, requiring numerous fixtures for positioning and fixation. However, this welding process has the following prominent problems: although existing intelligent welding systems have improved the welding process, they still require a large number of fixed fixtures to rigidly clamp the plug weld holes of the panels from the outside. While this can limit the displacement of the panels to some extent, the disassembly and assembly operations are cumbersome. Furthermore, when the panels undergo slight deformation at the plug weld hole position due to previous processing or transportation, it is inconvenient to compensate for the gaps, which can easily lead to excessively large local gaps, resulting in defects such as poor plug weld penetration and incomplete welds. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies that mostly use fixed clamps to rigidly hold the plug weld holes of plates from the outside, which is cumbersome to disassemble and assemble, and when the plates are slightly deformed at the plug weld hole position due to previous processing or transportation, it is inconvenient to compensate for the gap, which easily leads to defects such as poor plug weld penetration and false welds due to excessive local gaps, this invention provides a thin-walled box welding device and its welding method.

[0004] The technical implementation of the present invention is as follows: a thin-walled box welding device, comprising: an electric turntable, the rotating part of which is equipped with a limiting and fixing component; a fixing frame, fixedly connected to the rotating part of the electric turntable; a clamping component, connected to the rotating part of the electric turntable and the fixing frame; and a cooling component, installed on the clamping component; wherein, the thin-walled box includes a base frame, a skeleton, a left side plate, a right side plate, a front side plate, a rear side plate, a top plate, and lifting blocks; the base frame is provided with the skeleton on both the left and right sides, the skeleton is provided with a plurality of lifting blocks, and the top plate is provided with through holes adapted to the plurality of lifting blocks; the front side plate and the rear side plate are symmetrical to each other, the front side plate includes a first front side plate and a second front side plate; a welding robot is provided on the side of the electric turntable.

[0005] To further explain, the limiting and fixing assembly includes a limiting platform fixedly connected to the rotating part of the electric turntable and a plurality of electric clamps installed on the rotating part of the electric turntable; the limiting platform is provided with a limiting groove that cooperates with the base frame.

[0006] To further explain, the clamping assembly includes left and right clamping units connected to the rotating part of the electric turntable, a top clamping unit connected to the fixed frame, and front and rear clamping units connected to the fixed frame.

[0007] Further explanation: the front and rear clamping unit includes two clamping components symmetrically arranged front and rear. Each clamping component includes a first clamping module that cooperates with the first front side plate, a second clamping module that cooperates with the second front side plate, and several drive modules connected to the fixed frame. The first clamping module is connected to one of the drive modules, and the second clamping module is connected to all other drive modules. The first clamping module includes several first connecting plates, several first elastic telescopic rods fixedly connected to each first connecting plate, two first fixed plates, and a first clamping frame fixedly connected to both first fixed plates. The several first elastic telescopic rods are divided into two groups, with the telescopic ends of the two groups of first elastic telescopic rods respectively fixedly connected to the two first fixed plates. The first clamping frame is adapted to the first front side plate, and several electromagnets are provided on the pressing surface of the first clamping frame. The several first connecting plates are connected to one drive module via connecting blocks. The drive module includes an electric slide rail fixedly connected to the fixed frame and an electric slider slidably connected to the electric slide rail.

[0008] Further explanation: the second clamping module includes several second connecting plates that are respectively connected to several other driving modules, several second elastic telescopic rods fixedly connected to each second connecting plate, two second fixing plates, and a second clamping frame fixedly connected to the two second fixing plates; wherein, the several second elastic telescopic rods are divided into two groups, and the telescopic ends of the two groups of second elastic telescopic rods are respectively fixedly connected to the two second fixing plates; the second clamping frame is adapted to the second front side plate, and several electromagnets are provided on the pressing surface of the second clamping frame.

[0009] Further explanation: the left and right clamping units include two left and right propulsion modules and a third clamping frame and a fourth clamping frame respectively connected to the two propulsion modules; the third clamping frame is adapted to the left side plate, and the fourth clamping frame is adapted to the right side plate; the pressing surfaces of the third and fourth clamping frames are each provided with a plurality of electromagnets; the propulsion module includes a plurality of support plates fixedly connected to the rotating part of the electric turntable, a mounting block fixedly connected to the plurality of support plates, a plurality of first electric push rods fixedly connected to the mounting block, a fixing block fixedly connected to the telescopic ends of the plurality of first electric push rods, a plurality of third connecting plates fixedly connected to the fixing block, a plurality of third elastic telescopic rods fixedly connected to the plurality of third connecting plates, and two third fixing plates; the plurality of third elastic telescopic rods are divided into two groups, the telescopic ends of the two groups of third elastic telescopic rods are respectively fixedly connected to the two third fixing plates, and the two third fixing plates are jointly fixedly connected to the third clamping frame.

[0010] Further explanation: the top clamping unit includes two left and right flipping modules and a fifth clamping frame and a sixth clamping frame respectively connected to the two flipping modules; the fifth clamping frame and the sixth clamping frame are adapted to the top plate, and each of the fifth clamping frame and the sixth clamping frame is provided with a plurality of through slots corresponding to a plurality of lifting blocks; the flipping module includes an electric shaft connected to the fixed frame, a connecting frame fixed to the electric shaft, a plurality of second electric push rods fixed to the connecting frame, a plurality of fourth connecting plates fixed to the telescopic ends of the plurality of second electric push rods respectively, a plurality of fourth elastic telescopic rods fixed to the plurality of fourth connecting plates, and two fourth fixed plates; the plurality of fourth elastic telescopic rods are divided into two groups, and the telescopic ends of the two groups of fourth elastic telescopic rods are respectively fixed to the two fourth fixed plates.

[0011] Further explanation: the cooling assembly includes eight cooling units, which are respectively connected to two first clamping frames, two second clamping frames, a third clamping frame, a fourth clamping frame, a fifth clamping frame, and a sixth clamping frame; each cooling unit includes several cooling modules, several connecting pipes, and at least two connecting pipes; wherein, several cooling modules are connected to each other through one of the connecting pipes, and each connecting pipe is connected to one of the connecting pipes.

[0012] Further explanation: The cooling module includes a vent hood, several concentric partition cylinders with gradually decreasing radii disposed within the vent hood, several electromagnetic pressure relief valves disposed on each partition cylinder, a heat-conducting module connected to the vent hood, and an annular cooling plate disposed on the inner wall of the vent hood; the interior of the vent hood is divided into several cavities by the several partition cylinders, and the connecting pipe communicates with the outermost cavity; a conical portion is provided on the inner annular surface of the vent hood, and several annularly equidistant exhaust holes are provided on the conical portion.

[0013] The heat-conducting module includes several concentric sealing rings with gradually decreasing radii and several heat-conducting rings spaced apart from the sealing rings. The outer ring surface of the sealing ring with the largest radius is fixed to the vent hood, and the inner ring surface of the sealing ring with the smallest radius is fixed to the vent hood. Except for the sealing rings with the largest and smallest radii, each of the other sealing rings is fixed to a partition cylinder. The sealing rings are made of elastic rubber, and each sealing ring has a thin edge, through which each sealing ring is fixed to an adjacent heat-conducting ring.

[0014] Further explanation includes a thin-walled box welding method, comprising the following steps: Step 1, positioning installation: the base frame pre-installed with the skeleton is hoisted into the limiting groove of the limiting platform, and several electric clamps are activated to clamp and fix the base frame, so that the base frame and the clamping components are in a preset relative position; Step 2, adsorption installation: plug welding holes are pre-drilled on all plates, and then all plates are aligned according to a preset standard and kept in contact with the corresponding clamping frame pressing surface, and the corresponding plates are adsorbed and fixed by electromagnets set on each clamping frame; Step 3, plate clamping: the driving components are controlled to drive the corresponding clamping frame to move towards the square tube of the skeleton, so that each plate is in contact with the square tube. Simultaneously, each elastic telescopic rod is compressed, thereby ensuring that each plate and square tube are pressed together and maintain a preset clamping force to prevent misalignment during the fixing process; Step four, cooling protection: the cooling component is activated, and protective gas is supplied to the ventilation hood through the external protective gas delivery device connected to the connecting pipe. The heat-conducting ring locally compresses and compensates the plate, and then the fixing is performed. The electromagnetic pressure relief valve on the innermost partition cylinder is opened, allowing the protective gas to be sprayed through the exhaust hole to the plug weld hole to protect the molten pool. At the same time, the heat around the plug weld hole of the plate is directed to the corresponding cavity through the heat-conducting ring. As the protective gas flows from the outside to the inside, it carries away the heat layer by layer, cooling and reducing the temperature around the plug weld hole of the plate, thus completing the plug weld.

[0015] The beneficial effects of this invention are as follows: 1. This invention uses a limiting and fixing component to quickly position and clamp the base frame, and a multi-directional pressing component to independently press each side plate and top plate, ensuring that each plate is tightly fitted to the square tube of the frame before welding. The preset pressing force is maintained by the compression deformation of each elastic telescopic rod to prevent misalignment or warping of the plates during welding. The heat-conducting ring provides local compensation and pressing for the weld holes of the plates, ensuring that the weld hole area of ​​the plates can be tightly fitted to the square tube of the frame. In conjunction with a welding robot, this forms an intelligent welding system that automatically completes the welding, avoiding welding defects caused by excessive gaps in the weld hole area.

[0016] 2. This invention, by setting a conical part on the inner annular surface of the vent hood and opening several annularly spaced exhaust holes on the conical part, allows the protective gas to be sprayed evenly and in multiple directions from around the molten pool to the plug weld position. Compared with the traditional single-point axial air spraying method at the end of the welding torch, the annular multi-point uniform air spraying can ensure that the molten pool is always adequately covered with protective gas when the welding torch is finely adjusted or oscillated, avoiding oxidation defects caused by the airflow deviating to one side and exposing the other side of the molten pool to air, thus effectively improving the welding quality.

[0017] 3. By setting an electric shaft to drive the connecting frame and the top clamping unit connected to it to rotate, the fifth and sixth clamping frames can be rotated outward to avoid obstacles before the base frame is hoisted and after welding is completed. Other clamping frames can also be moved to avoid obstacles through corresponding drive components, which facilitates the hoisting and entry and exit of the base frame and the finished box, without interfering with the installation and disassembly of other parts, and improves the clamping and unloading efficiency.

[0018] 4. This invention selects plug welding as the connection method between the plate and the frame, and uses multi-directional clamping components to achieve fitting and local directional compensation clamping. This overcomes the inherent defect of traditional plug welding being highly sensitive to assembly gaps. Compared with traditional intermittent welding, plug welding points form a complete and continuous annular weld nugget. There is no weak area of ​​stress concentration caused by the alternating arc start and arc end of intermittent welding. The overall structural strength and fatigue resistance of the box are far superior to the traditional intermittent welding process. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the first type of thin-walled box assembly according to the present invention; Figure 3 This is a second schematic diagram of the assembly of the thin-walled box body of the present invention; Figure 4 This is a schematic diagram of the combined structure of the electric turntable, the fixing frame, and the clamping assembly of the present invention; Figure 5 This is a schematic diagram of the combined structure of the electric turntable and the limiting and fixing component of the present invention; Figure 6 This is a cross-sectional view of the limiting platform of the present invention; Figure 7 This is a partial structural diagram of the clamping assembly of the present invention; Figure 8 This is a schematic diagram of the first clamping module structure of the present invention; Figure 9 This is a schematic diagram of the second clamping module structure of the present invention; Figure 10 This is a schematic diagram of the left and right clamping unit structure of the present invention; Figure 11 This is a schematic diagram of the top clamping unit structure of the present invention; Figure 12 This is a schematic diagram of the flip module structure of the present invention; Figure 13 This is a schematic diagram of the combined structure of the ventilation hood, connecting pipe, and connecting pipe of the present invention; Figure 14 This is a schematic diagram of the internal structure of the ventilation hood of the present invention; Figure 15 This is a schematic diagram of the combined structure of the vent hood and sealing ring of the present invention; Figure 16 This is a cross-sectional view of the sealing ring and heat-conducting ring assembly of the present invention; Figure 17 This is a cross-sectional view of the sealing ring of the present invention.

[0020] In the attached diagrams: 001-Base frame, 002-Frame, 003-Left side plate, 004-Right side plate, 005-First front side plate, 006-Second front side plate, 007-Top plate, 008-Lifting block, 1-Electric turntable, 101-Welding robot, 2-Limiting platform, 3-Electric clamp, 4-Fixing frame, 5-First clamping frame, 6-Electric slide rail, 7-Electric slider, 8-First connecting plate, 9-First elastic telescopic rod, 10-First fixing plate, 11-Second clamping frame, 1101-Second fixing plate, 1102-Second elastic telescopic rod, 1103-Second connecting plate, 12-Third clamping frame, 1201-Third fixing plate, 1202-Third... Elastic telescopic rod, 1203-Third connecting plate, 13-Fourth clamping frame, 14-Support plate, 15-Mounting block, 16-First electric push rod, 17-Fixing block, 18-Connecting frame, 19-Second electric push rod, 20-Electric shaft, 21-Fifth clamping frame, 211-Through groove, 212-Fourth fixing plate, 213-Fourth elastic telescopic rod, 214-Fourth connecting plate, 22-Sixth clamping frame, 23-Ventilation hood, 2301-Conical part, 2302-Exhaust hole, 24-Sealing ring, 2401-Thin edge part, 25-Divider cylinder, 26-Electromagnetic pressure relief valve, 27-Annular cooling plate, 28-Heat-conducting ring, 29-Connecting pipe, 30-Connecting pipe. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions herein are used to explain the present invention, but are not intended to limit the present invention.

[0022] Example

[0023] according to Figures 1-17 As shown, this embodiment provides a thin-walled box welding device, including an electric turntable 1, a fixing frame 4, a clamping assembly, and a cooling assembly. The electric turntable 1 has a limiting and fixing assembly installed on its rotating part. This assembly fixes and limits the base frame 001, preventing misalignment of the welded parts due to shaking or displacement of the base frame 001 during welding. During installation, the electric turntable 1 is placed on the ground, and the welding robot is placed on any side of the turntable 1. When welding is required, the electric turntable 1 is activated to rotate all components, aligning the corresponding welding hole position with the welding robot for easier welding. The fixing frame 4 is fixedly connected to the rotating part of the electric turntable 1. The clamping assembly is connected to both the rotating part of the electric turntable 1 and the fixing frame 4. The cooling assembly is mounted on the clamping assembly. The thin-walled box includes a base frame 001, a skeleton 002, a left side plate 003, a right side plate 004, a front side plate, a rear side plate, a top plate 007, and a lifting block 008. The base frame 001 is provided with the frame 002 on both the left and right sides. The frame 002 is provided with several lifting blocks 008. The top plate 007 is provided with through holes that are adapted to the lifting blocks 008. The frame 002 is pre-installed and fixed on the base frame 001 before operation. The lifting blocks 008 are used to lift and transfer the frame 002 and the base frame 001 together. After the welding is completed, it is also convenient to lift and transport the entire box. A welding robot is installed on the side of the electric turntable; The front and rear side plates are symmetrical to each other. The front side plate includes a first front side plate 005 and a second front side plate 006. The frame 002 is provided with a square tube. Referring to the yellow marked component in the figure, during welding, all plates are fixed to the square tube of the frame 002 by plug welding. Before starting work, a preset number of plug welding holes are opened at the corresponding positions of all plates and square tubes. When the welding robot welds, the plates are pressed tightly onto the square tube of the frame 002 by the clamping component to avoid welding defects caused by excessive gaps. During the welding process, the cooling component cools and lowers the temperature around the plug welding holes of the plates to reduce the welding deformation of thin plates and improve the flatness of the box.

[0024] Reference Figure 1-6 As shown, the limiting and fixing assembly includes a limiting platform 2 fixedly connected to the rotating part of the electric turntable 1 and a plurality of electric clamps 3 installed on the rotating part of the electric turntable 1; the limiting platform 2 is provided with a limiting groove that cooperates with the base frame 001, and the base frame 001 is limited by the limiting groove. The plurality of electric clamps 3 cooperate with each other to clamp and fix the base frame 001, so that after the base frame 001 is installed and fixed, it is in a preset relative position with the pressing assembly. Then, the plate only needs to be aligned and fixed on the pressing assembly according to the preset standard, so that the position of the plug welding hole of the plate corresponds to the square tube of the skeleton 002, avoiding misalignment.

[0025] Reference Figure 1 and Figure 4 As shown, the clamping assembly includes left and right clamping units connected to the rotating part of the electric turntable 1, a top clamping unit connected to the fixed frame 4, and front and rear clamping units connected to the fixed frame 4.

[0026] The front and rear clamping unit includes two clamping components symmetrically arranged front and rear. The clamping components include a first clamping module that cooperates with the first front side plate 005, a second clamping module that cooperates with the second front side plate 006, and several drive modules connected to the fixing frame 4. The first clamping module is connected to one of the drive modules, and the second clamping module is connected to all other drive modules; Reference Figure 8 As shown, the first clamping module includes several first connecting plates 8, several first elastic telescopic rods 9 fixedly connected to each first connecting plate 8, two first fixing plates 10, and a first clamping frame 5 fixedly connected to the two first fixing plates 10. Among them, several first elastic telescopic rods 9 are divided into two groups, and the telescopic ends of the two groups of first elastic telescopic rods 9 are respectively fixed to two first fixed plates 10. The first clamping frame 5 is adapted to the first front side plate 005. The pressing surface of the first clamping frame 5 is provided with a plurality of electromagnets. The electromagnet adsorption surface is flush with the pressing surface of the first clamping frame 5. During operation, the first front side plate 005 is aligned with a preset standard and kept in contact with the first clamping frame 5. Then, the first front side plate 005 is fixed by electromagnet adsorption. Then, the first connecting plate 8 and its connected parts are driven by the drive module to move towards the square tube, so that the first front side plate 005 is in contact with the square tube and is squeezed, so that the first elastic telescopic rod 9 is compressed, thereby keeping the first front side plate 005 in contact with the square tube and maintaining a preset clamping force to avoid misalignment during welding. Several of the first connecting plates 8 are connected to one of the driving modules through connecting blocks; The drive module includes an electric slide rail 6 fixed to the fixed frame 4 and an electric slider 7 slidably connected to the electric slide rail 6. By controlling the electric slider 7 to slide on the electric slide rail 6, the corresponding components are moved.

[0027] Reference Figure 9 As shown, the second clamping module includes several second connecting plates 1103 that are respectively connected to several other driving modules, several second elastic telescopic rods 1102 fixedly connected to each second connecting plate 1103, two second fixing plates 1101, and a second clamping frame 11 fixedly connected to the two second fixing plates 1101. Among them, several second elastic telescopic rods 1102 are divided into two groups, and the telescopic ends of the two groups of second elastic telescopic rods 1102 are respectively fixed to two second fixed plates 1101. The second clamping frame 11 is adapted to the second front side plate 006. The pressing surface of the second clamping frame 11 is provided with a number of electromagnets. The working principle of the second clamping module is the same as that of the first clamping module, which will not be elaborated here.

[0028] The left and right clamping units include two left and right propulsion modules and a third clamping frame 12 and a fourth clamping frame 13 respectively connected to the two propulsion modules; The third clamping frame 12 is adapted to the left side plate 003, and the fourth clamping frame 13 is adapted to the right side plate 004. The pressing surfaces of the third clamping frame 12 and the fourth clamping frame 13 are provided with a number of electromagnets. The electromagnet adsorption surface is flush with the pressing surfaces of the third clamping frame 12 and the fourth clamping frame 13. Its working principle is the same as that of the first clamping frame 5, and will not be described in detail here. The propulsion module includes a plurality of support plates 14 fixedly connected to the rotating part of the electric turntable 1, a mounting block 15 fixedly connected to the plurality of support plates 14, a plurality of first electric push rods 16 fixedly connected to the mounting block 15, a fixing block 17 fixedly connected to the telescopic ends of the plurality of first electric push rods 16, a plurality of third connecting plates 1203 fixedly connected to the fixing block 17, a plurality of third elastic telescopic rods 1202 fixedly connected to the plurality of third connecting plates 1203, and two third fixing plates 1201; The third elastic telescopic rods 1202 are divided into two groups. The telescopic ends of the two groups of third elastic telescopic rods 1202 are respectively fixed to the two third fixed plates 1201. The two third fixed plates 1201 are jointly fixed to the third clamping frame 12. After the left side plate 003 and the right side plate 004 are installed and fixed, the first electric push rod 16 is extended by controlling the extension of the first electric push rod 16, so that the left side plate 003 and the right side plate 004 are attached to the square tube and the third elastic telescopic rods 1202 are compressed. In this way, the left side plate 003 and the right side plate 004 are attached to the square tube and maintain the preset clamping force to avoid misalignment during welding. The working principle is the same as that of the first clamping module, and will not be described in detail here.

[0029] Reference Figure 11 and Figure 12 As shown, the top clamping unit includes two left and right flip modules and a fifth clamping frame 21 and a sixth clamping frame 22 respectively connected to the two flip modules; The fifth clamping frame 21 and the sixth clamping frame 22 are adapted to the top plate 007. The fifth clamping frame 21 and the sixth clamping frame 22 are each provided with a plurality of through slots 211 corresponding to a plurality of hanging blocks 008. When the fifth clamping frame 21 and the sixth clamping frame 22 clamp the top plate 007, the hanging blocks 008 pass through the corresponding through slots 211 to avoid the fifth clamping frame 21 and the sixth clamping frame 22 being blocked by the hanging blocks 008. The flipping module includes an electric shaft 20 connected to the fixed frame 4, a connecting frame 18 fixedly connected to the electric shaft 20, a plurality of second electric push rods 19 fixedly connected to the connecting frame 18, a plurality of fourth connecting plates 214 respectively fixedly connected to the telescopic ends of the plurality of second electric push rods 19, a plurality of fourth elastic telescopic rods 213 fixedly connected to the plurality of fourth connecting plates 214, and two fourth fixed plates 212. The fourth elastic telescopic rods 213 are divided into two groups. The telescopic ends of the two groups of fourth elastic telescopic rods 213 are respectively fixed to the two fourth fixed plates 212. The working principle of the fifth clamping frame 21 and the sixth clamping frame 22 is the same as that of the other clamping frames mentioned above, and will not be elaborated here. It should be noted that the purpose of setting the electric shaft 20 is to, before the base frame 001 is hoisted to the limiting and fixing assembly, refer to the figure shown, with the front to back view as the reference, the electric shaft 20 on the left drives the connecting frame 18 and its connected parts to rotate counterclockwise by 180 degrees, and the electric shaft 20 on the right drives the connecting frame 18 and its connected parts to rotate clockwise by 180 degrees, thereby avoiding the fifth clamping frame 21 and the sixth clamping frame 22 from hindering the base frame 001 from being hoisted to the limiting and fixing assembly. The same applies after welding, so that the welded box can be hoisted out from the electric turntable 1.

[0030] The cooling assembly includes eight cooling units, which are respectively connected to two first clamping frames 5, two second clamping frames 11, a third clamping frame 12, a fourth clamping frame 13, a fifth clamping frame 21, and a sixth clamping frame 22. The cooling unit includes several cooling modules, several connecting pipes 29, and at least two connecting pipes 30; Several cooling modules are connected to each other through a connecting pipe 29, and each connecting pipe 30 is connected to a connecting pipe 29.

[0031] Reference Figures 13 to 17 As shown, the cooling module includes a vent 23, several concentric partition cylinders 25 with gradually decreasing radii disposed inside the vent 23, several electromagnetic pressure relief valves 26 disposed on each partition cylinder 25, a heat-conducting module connected to the vent 23, and an annular cooling plate 27 disposed on the inner wall of the vent 23; taking the installation of the cooling module on the first clamping frame 5 as an example, the vent 23, the connecting pipe 29, and the connecting pipe 30 are all fixedly connected to the first clamping frame 5; The interior of the ventilation hood 23 is divided into several cavities by several partition cylinders 25. The connecting pipe 29 is connected to the outermost cavity and connects two adjacent ventilation hoods 23 through the connecting pipe 29, so that gas can flow between adjacent ventilation hoods 23 through the outermost cavity and the connecting pipe 29. The inner ring surface of the vent 23 is provided with a conical part 2301, and the conical part 2301 is provided with a plurality of annularly distributed exhaust holes 2302.

[0032] The heat-conducting module includes several concentric sealing rings 24 with gradually decreasing radii and several heat-conducting rings 28 that are spaced apart from the sealing rings 24. Among them, the outer ring surface of the sealing ring 24 with the largest radius is fixedly connected to the vent 23, and the inner ring surface of the sealing ring 24 with the smallest radius is fixedly connected to the vent 23. Except for the sealing rings 24 with the largest and smallest radii, each of the other sealing rings 24 is fixedly connected to one of the partition cylinders 25; The sealing rings 24 are made of elastic rubber, and each sealing ring 24 has a thin edge 2401. Each sealing ring 24 is fixed to the adjacent heat-conducting ring 28 through the thin edge 2401. During operation, a protective gas delivery device is connected to the outside through the connecting pipe 30. Each vent 23 corresponds to a plug welding hole on the plate. The vent 23 has a through hole that is directly opposite the plug welding hole to facilitate plug welding with a welding torch. Before welding, the protective gas is delivered into the vent 23 until it passes through the electromagnetic pressure relief valve 26 on each partition cylinder 25, so that the multiple cavities in the vent 23 maintain a preset gas pressure. The innermost partition cylinder... The electromagnetic pressure relief valve 26 on 25 is currently closed. During the increase of air pressure in each cavity, if the gap between the plug weld hole and the square tube becomes too large due to slight deformation of the plate during transfer and installation, the increased air pressure in the cavity will cause the heat-conducting ring 28 to further compress the corresponding area of ​​the plate with excessive gap. At the same time, it will cause the thin edge 2401 to deform, and then the heat-conducting ring 28 will further compress the plate to make the corresponding plug weld hole position close to the square tube. This avoids poor local welding effect caused by slight deformation of the plate during transfer and installation, and at the same time keeps the heat-conducting ring 28 in contact with the area around the plug weld hole of the plate to ensure subsequent heat conduction. The cooling effect of ring 28, along with the activation of annular cooling plate 27 to cool the protective gas in the outermost cavity, allows the electromagnetic pressure relief valve 26 on the innermost partition cylinder 25 to open during welding. However, all electromagnetic pressure relief valves 26 maintain their preset pressure relief values, meaning that all cavities maintain their preset gas pressure. Simultaneously, the protective gas delivery equipment continues to deliver protective gas, allowing it to flow layer by layer from the outermost cavity inwards. Finally, the protective gas is sprayed through several annularly spaced exhaust holes 2302 on the conical part 2301 towards the plug weld hole, protecting the weld pool and preventing oxidation. The welding torch no longer needs to spray protective gas through a protective gas nozzle. Protection is achieved by spraying air onto the plug weld hole through several fixed, equidistantly distributed annular vents 2302 during the welding process. This prevents the axial airflow from being biased to one side during the fine-tuning of welding with a conventional welding torch, leaving the molten pool on the other side exposed to air and prone to oxidation. Simultaneously, the heat around the plug weld hole is directed to the corresponding cavity through the heat-conducting ring 28. The heat is carried away layer by layer from the outermost pre-cooled protective gas as it flows from the outside to the inside. This process cools the plug weld hole area of ​​the plate, reducing the deformation of the thin plate during welding. At the same time, the cooling is gradually reduced from the outside to the inside to prevent the area near the molten pool from cooling too quickly and causing cracks.

[0033] It also includes a method for welding thin-walled boxes, comprising the following steps: Step 1, Positioning and Installation: Hoist the base frame 001, which has been pre-installed with the skeleton 002, into the limiting groove of the limiting platform 2. Activate several electric clamps 3 to clamp and fix the base frame 001, so that the base frame 001 and the pressing component are in a preset relative position. Step 2, adsorption installation: pre-drill plug welding holes on all the plates, then align all the plates according to the preset standard and keep them in contact with the corresponding clamping frame pressing surface. The corresponding plates are then adsorbed and fixed by the electromagnets set on each clamping frame. Step 3: Plate clamping. Control each driving component to move the corresponding clamping frame towards the square tube of the skeleton 002, so that each plate is in contact with the square tube. At the same time, each elastic telescopic rod is compressed, thereby keeping each plate in contact with the square tube and maintaining the preset clamping force to avoid displacement and misalignment during welding. Step 4: Cooling and protection. Start the cooling system and supply protective gas to the vent 23 via the external protective gas delivery device connected to the connecting pipe 30. Use the heat-conducting ring 28 to locally compress and compensate the plate. Then, perform welding and open the electromagnetic pressure relief valve 26 on the innermost partition cylinder 25. This allows the protective gas to be sprayed through the exhaust port 2302 onto the plug weld hole to protect the molten pool. At the same time, the heat around the plug weld hole of the plate is directed to the corresponding cavity through the heat-conducting ring 28. As the protective gas flows from the outside to the inside, it carries away the heat layer by layer, cooling the area around the plug weld hole of the plate and completing the plug weld.

[0034] During operation, first, control each clamping frame away from the hoisting position of the base frame 001 to avoid obstructing the hoisting of the base frame 001. Then, hoist the base frame 001, which is pre-installed with the skeleton 002 and the lifting block 008, into the limiting groove of the limiting platform 2, and clamp it in place by the electric clamp 3, so that the relative position of the base frame 001 and each clamping component is accurate. Subsequently, each side plate and top plate 007 are attached and adsorbed onto the electromagnet of the corresponding clamping frame according to the preset standard. The drive component pushes the clamping frame to move towards the square tube of the skeleton 002, and a stable clamping force is generated by the compression of the corresponding elastic telescopic rod, so that all plates are tightly attached to the skeleton. Next, the cooling assembly is connected to an external protective gas delivery device, and the annular cooling plate 27 is activated. This establishes a preset gas pressure within the multi-layered cavities of the ventilation hood 23. The heat-conducting ring 28 finely adjusts and presses the plate locally, compensating for minor deformations that may occur during transfer. During welding, the electromagnetic pressure relief valve 26 on the innermost partition cylinder 25 is opened, and the protective gas is evenly sprayed from the exhaust port 2302 on the conical part 2301 onto the weld pool of the plug weld hole to prevent oxidation. Simultaneously, the cooled protective gas flows layer by layer through the heat-conducting ring 28, carrying away welding heat and reducing thermal deformation during thin-plate welding. The electric turntable 1 rotates as needed, cooperating with the welding robot to form an intelligent welding system that automatically completes the welding, sequentially welding all plug weld holes. After all welding is completed, the electromagnet closes and the clamping frame releases, and the flipping module flips outward to avoid obstruction, facilitating the removal of the finished box body. The entire process achieves integrated positioning, clamping, online cooling, and protective gas welding of thin-walled box body plates, effectively improving welding quality and flatness compared to traditional intermittent welding methods.

[0035] The method also includes a thin-walled box welding method, comprising the following steps: Step 1, positioning installation: the base frame 001, pre-installed with the skeleton 002, is hoisted into the limiting groove of the limiting platform 2, and several electric clamps 3 are activated to clamp and fix the base frame 001, so that the base frame 001 and the clamping assembly are in a preset relative position; Step 2, adsorption installation: plug welding holes are pre-drilled on all plates, and then all plates are aligned according to a preset standard and kept in contact with the corresponding clamping frame pressing surface, and the corresponding plates are adsorbed and fixed by the electromagnets set on each clamping frame; Step 3, plate clamping: the driving components are controlled to drive the corresponding clamping frame to move towards the square tube of the skeleton 002, so that each plate is in contact with the square tube, and at the same time... Each elastic telescopic rod is compressed, thereby ensuring that each plate and square tube are pressed together and maintain a preset clamping force to prevent misalignment during the fixing process; Step four, cooling protection: the cooling component is activated, and during welding, protective gas is supplied to the vent hood 23 through the external protective gas delivery device connected to the connecting pipe 30. The heat-conducting ring 28 locally compresses and compensates the plate, and then the fixing is performed. The electromagnetic pressure relief valve 26 on the innermost partition cylinder 25 is opened, so that the protective gas is sprayed into the plug weld hole through the exhaust hole 2302 to protect the molten pool. At the same time, the heat around the plug weld hole of the plate is guided to the corresponding cavity through the heat-conducting ring 28. As the protective gas flows from the outside to the inside, it carries away the heat layer by layer, cooling and reducing the temperature around the plug weld hole of the plate, thus completing the plug weld.

[0036] Although this disclosure has been described with respect to only a limited number of embodiments, those skilled in the art who benefit from this disclosure will understand that various other embodiments can be devised without departing from the scope of the invention. Therefore, the scope of the invention should be limited only by the appended claims.

Claims

1. A thin-walled box welding device, characterized in that, include: An electric turntable has a limit fixing component installed on its rotating part; The fixed frame is fixedly connected to the rotating part of the electric turntable; A clamping assembly is connected to the rotating part of the electric turntable and the fixed frame; and A cooling assembly is mounted on the clamping assembly; The thin-walled box includes a base frame, a skeleton, a left side plate, a right side plate, a front side plate, a rear side plate, a top plate, and a lifting block; The frame is provided on both the left and right sides of the base frame, and a number of lifting blocks are provided on the frame. The top plate is provided with through holes that are adapted to the number of lifting blocks. The front side panel and the rear side panel are symmetrical to each other, and the front side panel includes a first front side panel and a second front side panel; A welding robot is installed on the side of the electric turntable.

2. The thin-walled box welding device according to claim 1, characterized in that, The limiting and fixing assembly includes a limiting platform fixedly connected to the rotating part of the electric turntable and a plurality of electric clamps installed on the rotating part of the electric turntable; the limiting platform is provided with a limiting groove that cooperates with the base frame.

3. A thin-walled box welding device according to any one of claims 1-2, characterized in that, The clamping assembly includes left and right clamping units connected to the rotating part of the electric turntable, a top clamping unit connected to the fixed frame, and front and rear clamping units connected to the fixed frame.

4. The thin-walled box welding device according to claim 3, characterized in that, The front and rear clamping unit includes two clamping components symmetrically arranged front and rear. The clamping components include a first clamping module that cooperates with the first front side plate, a second clamping module that cooperates with the second front side plate, and several drive modules connected to the fixing frame. The first clamping module is connected to one of the drive modules, and the second clamping module is connected to all other drive modules; The first clamping module includes several first connecting plates, several first elastic telescopic rods fixedly connected to each first connecting plate, two first fixing plates, and a first clamping frame fixedly connected to the two first fixing plates. The first elastic telescopic rods are divided into two groups, and the telescopic ends of the two groups of first elastic telescopic rods are respectively fixed to two first fixed plates; the first clamping frame is adapted to the first front side plate, and the pressing surface of the first clamping frame is provided with several electromagnets; the first connecting plates are connected to a driving module through connecting blocks; the driving module includes an electric slide rail fixed to the fixed frame and an electric slider slidably connected to the electric slide rail.

5. The thin-walled box welding device according to claim 4, characterized in that, The second clamping module includes several second connecting plates that are respectively connected to several other drive modules, several second elastic telescopic rods fixedly connected to each second connecting plate, two second fixing plates, and a second clamping frame that is fixedly connected to the two second fixing plates. Among them, several second elastic telescopic rods are divided into two groups, and the telescopic ends of the two groups of second elastic telescopic rods are respectively fixed to two second fixed plates; the second pressing frame is adapted to the second front side plate, and several electromagnets are provided on the pressing surface of the second pressing frame.

6. The thin-walled box welding device according to claim 5, characterized in that, The left and right clamping units include two left and right propulsion modules and a third clamping frame and a fourth clamping frame respectively connected to the two propulsion modules; The third clamping frame is adapted to the left side plate, and the fourth clamping frame is adapted to the right side plate. The pressing surfaces of the third clamping frame and the fourth clamping frame are each provided with a number of electromagnets. The propulsion module includes several support plates fixedly connected to the rotating part of the electric turntable, a mounting block fixedly connected to several support plates, several first electric push rods fixedly connected to the mounting block, a fixing block fixedly connected to the telescopic ends of several first electric push rods, several third connecting plates fixedly connected to the fixing block, several third elastic telescopic rods fixedly connected to several third connecting plates, and two third fixing plates. The plurality of the third elastic telescopic rods are divided into two groups, and the telescopic ends of the two groups of the third elastic telescopic rods are respectively fixedly connected to the two third fixed plates, and the two third fixed plates are together fixedly connected to the third clamping frame.

7. A thin-walled box welding device according to claim 6, characterized in that, The top clamping unit includes two left and right flip modules and a fifth clamping frame and a sixth clamping frame respectively connected to the two flip modules; The fifth and sixth clamping frames are adapted to the top plate, and each of the fifth and sixth clamping frames is provided with a plurality of through slots corresponding to a plurality of lifting blocks; the flipping module includes an electric shaft connected to the fixed frame, a connecting frame fixed to the electric shaft, a plurality of second electric push rods fixed to the connecting frame, a plurality of fourth connecting plates fixed to the telescopic ends of the plurality of second electric push rods respectively, a plurality of fourth elastic telescopic rods fixed to the plurality of fourth connecting plates, and two fourth fixed plates; The plurality of the fourth elastic telescopic rods are divided into two groups, and the telescopic ends of the two groups of the fourth elastic telescopic rods are respectively fixed to the two fourth fixed plates.

8. A thin-walled box welding device according to claim 7, characterized in that, The cooling assembly includes eight cooling units, which are respectively connected to two first clamping frames, two second clamping frames, a third clamping frame, a fourth clamping frame, a fifth clamping frame, and a sixth clamping frame; each cooling unit includes several cooling modules, several connecting pipes, and at least two connecting pipes; wherein, several cooling modules are connected to each other through one of the connecting pipes, and each connecting pipe is connected to one of the connecting pipes.

9. A thin-walled box welding device according to claim 8, characterized in that, The cooling module includes a vent hood, several concentric partition cylinders with gradually decreasing radii disposed inside the vent hood, several electromagnetic pressure relief valves disposed on each partition cylinder, a heat-conducting module connected to the vent hood, and an annular cooling plate disposed on the inner wall of the vent hood; the interior of the vent hood is divided into several cavities by the several partition cylinders, and the connecting pipe communicates with the outermost cavity; a conical portion is provided on the inner annular surface of the vent hood, and several annularly equidistant exhaust holes are provided on the conical portion; The heat-conducting module includes several concentric sealing rings with gradually decreasing radii and several heat-conducting rings that are spaced apart from the sealing rings. Among them, the outer ring surface of the sealing ring with the largest radius is fixedly connected to the vent hood, and the inner ring surface of the sealing ring with the smallest radius is fixedly connected to the vent hood. Except for the sealing rings with the largest and smallest radii, each of the other sealing rings is fixedly connected to one of the partition cylinders; The sealing ring is made of elastic rubber, and each sealing ring has a thin edge. Each sealing ring is fixed to the adjacent heat-conducting ring through the thin edge.

10. A method for welding thin-walled boxes, applicable to the thin-walled box welding apparatus described in claim 9, characterized in that, Includes the following steps: Step 1, Positioning and Installation: Hoist the pre-installed frame into the limiting slot of the limiting platform, and activate several electric clamps to clamp and fix the frame, so that the frame and the clamping components are in the preset relative position. Step 2, adsorption installation: pre-drill plug welding holes on all the plates, then align all the plates according to the preset standard and keep them in contact with the corresponding clamping frame pressing surface. The corresponding plates are then adsorbed and fixed by the electromagnets set on each clamping frame. Step 3: Plate clamping. Control each drive component to move the corresponding clamping frame towards the square tube of the skeleton, so that each plate is in contact with the square tube. At the same time, each elastic telescopic rod is compressed, thereby keeping each plate in contact with the square tube and maintaining the preset clamping force to avoid displacement or misalignment during the fixing process. Step 4: Cooling and protection. Activate the cooling system and supply protective gas to the vent hood via an external protective gas delivery device connected to the connecting pipe. Use the heat-conducting ring to locally compress and compensate the plate, then fix it in place and open the electromagnetic pressure relief valve on the innermost partition cylinder. This allows the protective gas to be sprayed through the exhaust port onto the plug weld hole to protect the molten pool. Simultaneously, the heat-conducting ring directs the heat around the plug weld hole of the plate to the corresponding cavity. As the protective gas flows from the outside in, it gradually carries away the heat, cooling the area around the plug weld hole of the plate and completing the plug weld.

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