A CNC welding machine for sheet metal chassis and cabinets

Abstract

This invention discloses a CNC welding machine for sheet metal chassis and cabinets, comprising: a base, on which a clamping component is disposed, and on which a welding component is disposed; the clamping component includes a limiting component one for limiting the upper and lower ends of the outer side of the bent sheet metal chassis or cabinet, and a limiting component two for limiting the left and right ends of the outer side of the bent sheet metal chassis or cabinet, which is fixedly disposed on the limiting component one; in this invention, the clamping component can achieve synchronous centering clamping of the bent sheet metal chassis or cabinet in four directions (up, down, left, and right), ensuring accurate and reliable workpiece positioning, effectively avoiding workpiece displacement and warping deformation during internal welding, ensuring the positional accuracy and forming consistency of the inner weld seam, and adopting a single-power synchronous transmission layout, simplifying the drive structure, improving the synchronization of clamping actions, and flexibly adapting to chassis and cabinet workpieces of various specifications and sizes, with a high degree of flexibility.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, specifically a CNC welding machine for sheet metal chassis and cabinets. Background Technology

[0002] Sheet metal chassis and cabinet welding is a core forming process in the sheet metal cold working system. Specifically, it refers to the process of splicing sheet metal, corner connection and fixing internal reinforcement structure through fusion welding for thin sheet metal boxes formed by bending. It is a key link to ensure the structural strength, sealing performance and electromagnetic shielding capability of the box. It is widely used in industrial control, communication network, power energy and other fields. Among them, the seamless welding of the inner side has high requirements for the positioning accuracy of the workpiece and the consistency of the weld formation, which directly determines the appearance quality and assembly accuracy of the finished product.

[0003] Existing sheet metal chassis and cabinet welding clamping solutions still have room for improvement in the consistency of multi-directional synchronous centering and positioning. During the workpiece clamping process, positional deviation is prone to occur. When carrying out internal welding operations, insufficient positioning stability can lead to weld position deviation and sheet metal warping and deformation, affecting the forming accuracy and uniformity of the inner weld. At the same time, the clamping drive structure is relatively complex, the efficiency of changing and adapting to different specifications of workpieces is low, and the flexibility is limited, making it difficult to meet the comprehensive needs of high-precision positioning and multi-specification production at the same time. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing sheet metal chassis and cabinet welding clamping solutions. These solutions have room for improvement in the consistency of synchronous centering and positioning in multiple directions. Furthermore, workpiece clamping is prone to positional deviation, and insufficient positioning stability during internal welding operations can lead to weld position deviations and sheet metal warping, affecting the forming accuracy and uniformity of the inner weld. Additionally, the clamping drive structure is relatively complex, resulting in low efficiency in adapting to different workpiece specifications and limited flexibility, making it difficult to simultaneously meet the comprehensive needs of high-precision positioning and multi-specification production. Therefore, this invention provides a CNC welding machine for sheet metal chassis and cabinets.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a CNC welding machine for sheet metal chassis and cabinets, comprising: a base, wherein a clamping member is disposed on the base, and a welding member is disposed on the clamping member; The clamping component includes a limiting component one for limiting the upper and lower ends of the outer side of the bent sheet metal chassis or cabinet, and a limiting component two for limiting the left and right ends of the outer side of the bent sheet metal chassis or cabinet is fixedly provided on the limiting component one. The second limiting component includes a guide box with a cavity on its side. A rotating rod is inserted through the guide box and slidably connected to it. Two threaded grooves are provided on the outer side of the rotating rod, mirror-distributed on the rod. A clamping block is slidably connected to the guide box, and the rotating rod passes through the clamping block. Two sets of clamping blocks are provided, each set located in the area of ​​each threaded groove on the rotating rod, and the clamping block is threadedly connected to the threaded groove. An extension column is fixedly connected to one end of the rotating rod, and a transmission wheel is fixedly connected to the outer surface of the extension column. Two sets of guide boxes are provided. In each set of guide boxes, a transmission belt is sleeved on the outer surface of each set of transmission wheels on the extension column at one end of the rotating rod, and the transmission belt meshes with the two sets of transmission wheels respectively. A motor is fixedly connected to the side of one set of guide boxes away from the extension column, and the output end of the motor is fixedly connected to the rotating rod.

[0006] As a further embodiment of the present invention: the guide box is rectangular, and the opening of the cavity inside the guide box faces the side where the sheet metal chassis or cabinet is located; the rotating rod is I-shaped; and the height of the clamping block is consistent with the height of the cavity inside the guide box.

[0007] As a further embodiment of the present invention: the limiting component also includes a guide box, a rotating rod, a clamping block, an extension column, a transmission wheel, a transmission belt, and a motor.

[0008] As a further embodiment of the present invention: the bottom end of the guide box in the first limiting member is fixedly connected to the top end of the base, the guide box in the second limiting member is fixedly connected to the guide box in the first limiting member, and the guide box in the second limiting member is perpendicularly distributed to the guide box in the first limiting member.

[0009] As a further embodiment of the present invention: the welded component includes a mounting plate fixedly connected to a set of clamping blocks on the same side of each of the two sets of guide boxes in the limiting component two. A hydraulic rod is fixedly connected to the side of the mounting plate facing the guide box. Four sets of hydraulic rods are provided and evenly distributed on the mounting plate. The telescopic end of the hydraulic rod passes through the mounting plate and is fixedly connected to a rotating frame. The rotating frame is U-shaped.

[0010] As a further embodiment of the present invention: a steering block is provided on the inner side of the rotating frame along the height direction of the rotating frame. The steering block is U-shaped when viewed from above, with one side being an arc surface and the other side being a straight surface. The upper and lower ends of the steering block are rotatably connected to the rotating frame. A second motor is fixedly connected to the top of the rotating frame. The output end of the second motor passes through the rotating frame and is fixedly connected to the steering block.

[0011] As a further embodiment of the present invention: a lifting frame is fixedly connected to one side of the steering block, a worm gear is provided inside the lifting frame, the worm gear passes through the upper and lower ends of the lifting frame and is rotatably connected to the lifting frame, a motor is fixedly connected to the top of the lifting frame, the output end of the motor is fixedly connected to the worm gear, a fixed plate is slidably connected inside the lifting frame, the worm gear passes through the fixed plate and is meshed with the fixed plate, and a welding gun robotic arm is fixedly connected to one end of the fixed plate.

[0012] As a further embodiment of the present invention: the welding gun robotic arm is mainly composed of a base, a multi-section articulated arm body, a servo drive mechanism, an end clamping seat and a welding gun. During operation, the servo motor drives the arm body to move in multi-axis linkage, flexibly changing position according to a preset trajectory, and driving the welding gun to accurately reach the weld seams of the chassis and cabinet, thus completing continuous and stable CNC welding operations.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the clamping component can simultaneously center and clamp the bent sheet metal chassis and cabinet in four directions (up, down, left, and right), ensuring accurate and reliable workpiece positioning, effectively preventing workpiece displacement and warping deformation during internal welding, and ensuring the positional accuracy and forming consistency of the inner weld. At the same time, the single-power synchronous transmission layout simplifies the drive structure, improves the synchronization of clamping actions, and can flexibly adapt to chassis and cabinet workpieces of various specifications and sizes, with a high degree of flexibility. 2. In this invention, the welding gun can be driven into the inside of the bending machine cabinet by the welding component, and all welds are completed only from the inside of the plate. This leaves no visible weld marks, spatter, or burn marks on the outside of the cabinet, eliminating the need for subsequent surface grinding and recoating. With the multi-dimensional adjustment of front and rear feed, angle deflection, and height, as well as the multi-axis linkage capability of the welding gun robotic arm, all welds inside the cabinet can be fully covered. All operations can be completed in one clamping, effectively improving welding efficiency and the appearance quality of the finished product. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the clamping component in this invention; Figure 3 This is a schematic diagram of the structure of the limiting member one in this invention; Figure 4 In this invention Figure 2 A schematic diagram of the structure at point A; Figure 5 This is a schematic diagram of the structure of the welded component in this invention; Figure 6 This is a schematic diagram of the lifting frame in this invention; Figure 7 In this invention Figure 6A schematic diagram of the structure at point B.

[0015] In the diagram: 1. Base; 2. Clamping component; 21. Limiting component one; 22. Limiting component two; 221. Guide box; 222. Rotating rod; 223. Clamping block; 224. Extension column; 225. Transmission wheel; 226. Transmission belt; 227. Motor one; 3. Welded component; 31. Mounting plate; 32. Hydraulic rod; 33. Rotating frame; 34. Steering block; 35. Motor two; 36. Lifting frame; 37. Worm gear; 38. Motor three; 39. Fixing plate; 310. Welding gun robotic arm. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0018] Reference Figure 1 In this embodiment of the invention, a CNC welding machine for sheet metal chassis and cabinets includes: a base 1, a clamping member 2 on the base 1, and a welding member 3 on the clamping member 2.

[0019] Reference Figures 2 to 4The clamping component 2 includes a limiting component 21 that limits the upper and lower ends of the outer side of the bent sheet metal chassis or cabinet. A limiting component 22 that limits the left and right ends of the outer side of the bent sheet metal chassis or cabinet is fixedly installed on the limiting component 21. The limiting component 22 includes a guide box 221. A cavity is opened on the side of the guide box 221, with the cavity opening facing the side where the sheet metal chassis or cabinet is located. The guide box 221 is rectangular, and a rotating rod 222 is provided through its length. The rotating rod 222 is I-shaped. Rotating rod 222 is slidably connected to guide box 221. Two threaded grooves are formed on the outer side of rotating rod 222, and these two grooves are mirror images of each other on rotating rod 222. A clamping block 223 is slidably connected to guide box 221. The height of clamping block 223 is the same as the height of the internal cavity of guide box 221. Rotating rod 222 passes through clamping block 223. Two sets of clamping blocks 223 are provided, each set located in the area of ​​each threaded groove on rotating rod 222, and the clamping block 223 is threadedly connected to the threaded groove. 2. An extension column 224 is fixedly connected to one end of the guide box 221. A transmission wheel 225 is fixedly connected to the outer surface of the extension column 224. Two sets of guide boxes 221 are provided. In each set of guide boxes 221, a transmission belt 226 is sleeved on the outer surface of each set of transmission wheels 225 on the extension column 224 at one end of the rotating rod 222. The transmission belt 226 is engaged with the two sets of transmission wheels 225 respectively. A motor 227 is fixedly connected to the side of one set of guide boxes 221 away from the extension column 224. The motor 227 outputs... The end is fixedly connected to the rotating rod 222. The first limiting member 21 also includes a guide box 221, a rotating rod 222, a clamping block 223, an extension column 224, a transmission wheel 225, a transmission belt 226, and a motor 227. The bottom end of the guide box 221 in the first limiting member 21 is fixedly connected to the top end of the base 1. The guide box 221 in the second limiting member 22 is fixedly connected to the guide box 221 in the first limiting member 21, and the guide box 221 in the second limiting member 22 is perpendicularly distributed to the guide box 221 in the first limiting member 21.

[0020] The above solution is adopted: through the vertical arrangement of limit component 1 21 and limit component 22, the outer side of the bent sheet metal chassis cabinet can be omnidirectionally limited and fixed from both the top and bottom and left and right dimensions. The mirror thread groove on the rotating rod 222 drives the two sets of clamping blocks 223 to move synchronously towards each other, so as to realize the centering and clamping of the workpiece and ensure the positioning accuracy. Through the synchronous transmission structure of the transmission wheel 225 and the transmission belt 226, a single motor 1 227 can drive the clamping mechanism in the two sets of guide boxes 221 to operate synchronously, improve the consistency of clamping action and work efficiency, and avoid workpiece skew and displacement.

[0021] Reference Figures 5 to 6The welded component 3 includes a mounting plate 31 fixedly connected to a set of clamping blocks 223 on the same side of each of the two sets of guide boxes 221 in the limiting component 22. A hydraulic rod 32 is fixedly connected to the side of the mounting plate 31 facing the guide box 221. Four sets of hydraulic rods 32 are evenly distributed on the mounting plate 31. The telescopic ends of the hydraulic rods 32 penetrate the mounting plate 31 and are fixedly connected to a rotating frame 33. The rotating frame 33 is U-shaped. A steering block 34 is provided on the inner side of the rotating frame 33 along its height direction. The steering block 34 is U-shaped when viewed from above, with one side being an arc surface and the other side being a straight surface. The upper and lower ends of the steering block 34 are rotatably connected to the rotating frame 33. A second motor 35 is fixedly connected to the top of the rotating frame 33. The output end of the second motor 35 penetrates the rotating frame 33 and is fixedly connected to the steering block 34. A lifting frame 36 is fixedly connected to one side of block 34. A worm gear 37 is installed inside the lifting frame 36, passing through the upper and lower ends of the lifting frame 36 and rotatably connected to it. A motor 38 is fixedly connected to the top of the lifting frame 36, and the output end of the motor 38 is fixedly connected to the worm gear 37. A fixing plate 39 is slidably connected inside the lifting frame 36, and the worm gear 37 passes through the fixing plate 39 and meshes with it. A welding gun robotic arm 310 is fixedly connected to one end of the fixing plate 39. The welding gun robotic arm 310 mainly consists of a base, a multi-section articulated arm body, a servo drive mechanism, an end clamping seat, and a welding gun. During operation, the servo motor drives the arm body to move in multi-axis linkage, flexibly changing position according to a preset trajectory, and driving the welding gun to accurately reach the weld seams of the chassis and cabinet, completing continuous and stable CNC welding operations.

[0022] The above solution is adopted: the hydraulic rod 32 drives the rotating frame 33 to feed back and forth as a whole, which can precisely control the working depth of the welding parts into the box. The motor 35 drives the steering block 34 to rotate, which drives the welding gun robotic arm 310 to swing into the bent and formed chassis cabinet. All welding operations are completed only from the inside of the plate. The welding gun height is stably adjusted by the meshing transmission between the worm gear 37 and the fixed plate 39. With the multi-axis linkage of the welding gun robotic arm 310, the inner corner seams, splicing seams and reinforcing rib welding points are fully covered.

[0023] The working principle of this invention is as follows: In use, the sheet metal chassis or cabinet workpiece that has been bent is first hoisted to the clamping station above the base 1, with the open side of the workpiece facing the direction of the welded part 3. The clamping area of ​​the limiting component 21 is initially aligned, making the outer wall of the workpiece approximately parallel to the clamping surface of the clamping block 223. The bottom of the workpiece is placed stably, completing the initial alignment. Then, the motor 227 corresponding to the limiting component 21 is started. The output end of the motor 227 drives the rotating rod 222 inside the corresponding guide box 221 to rotate at a constant speed. The two mirror-distributed threaded grooves on the outer side of the rotating rod 222 synchronously drive the two sets of clamping blocks 223 to slide towards each other along the internal cavity of the guide box 221, gradually approaching the upper and lower end faces of the workpiece. During this process, the extension column at the end of the rotating rod 222... 224 synchronously drives the transmission wheel 225 to rotate, and through the meshing transmission belt 226, drives the rotating rod 222 in another set of guide boxes 221 to rotate at the same speed and in the same direction, ensuring that the clamping blocks 223 in the two sets of guide boxes 221 are fed synchronously until the side wall of the clamping block 223 is tightly attached to the outer side of the upper and lower ends of the workpiece. The motor 1 227 stops running, completing the vertical clamping of the workpiece, ensuring that the workpiece is evenly stressed vertically without skew or displacement. After the vertical clamping is completed, the motor 1 227 corresponding to the second limiting component 22 is started, and similarly drives the rotating rod 222 in the corresponding guide box 221 to rotate. Through the mirrored thread groove, the two sets of clamping blocks 223 move synchronously towards each other, gradually approaching the left and right end faces of the outer side of the workpiece. Through the transmission wheel 225 and the transmission belt 226, the two sets of clamping blocks 223 move synchronously towards each other, gradually approaching the left and right end faces of the outer side of the workpiece. The synchronous transmission structure of the 6 ensures that the clamping actions in the two sets of guide boxes 221 are synchronized and consistent until the clamping block 223 is tightly abutted against the outer side of the left and right ends of the workpiece. Motor 1 227 then stops operating, completing the left and right direction limiting clamping of the workpiece. At this point, limiting component 1 21 and limiting component 222 firmly fix the workpiece in the clamping position from four directions, effectively preventing workpiece shaking and displacement during welding and ensuring the positional accuracy of the inner welding. After the workpiece is clamped and fixed, the control system, based on the specifications of the workpiece to be welded and the preset inner weld seam coordinates, first drives the hydraulic rod 32 to extend. The extension end of the hydraulic rod 32 drives the rotating frame 33 to move forward horizontally, pushing the welding component to the preset position on the opening side of the workpiece. Then, motor 225 is started. 5. The drive steering block 34 deflects around the vertical axis, causing the lifting frame 36 and welding gun robotic arm 310 to swing inwards towards the inside of the housing, so that the welding gun robotic arm 310 is completely moved into the internal cavity of the bending machine housing. In conjunction with the motor 38 driving the worm gear 37 to rotate, through the meshing transmission between the worm gear 37 and the fixed plate 39, the fixed plate 39 is driven to slide smoothly up and down along the internal guide rail of the lifting frame 36, adjusting the height position of the welding gun robotic arm 310 so that the end of the welding gun is precisely aligned with the starting weld position on the inside of the workpiece. The welding operation is only performed on the inside of the bent housing housing material. For the corner splices, vertical splices, and internal reinforcing rib welds on the inside of the housing, the welding gun robotic arm 310 starts according to the preset welding trajectory program, through the multi-axis linkage of its multi-section articulated arm.The end-effector welding torch moves at a constant speed along the inner weld seam trajectory, sequentially completing the continuous welding operation of all inner weld seams. During the operation, the feed depth can be finely adjusted via hydraulic rod 32, and the working height can be adjusted via motor 38. Combined with the small-angle deflection of steering block 34, it adapts to inner weld seams at different positions. The entire process requires no workpiece flipping or secondary clamping, and there is no welding operation on the outside of the housing, preventing weld marks, spatter, and discoloration. After completing the welding of one inner weld seam, the control system sequentially adjusts the feed amount of hydraulic rod 32, the deflection angle of steering block 34, and the height and trajectory of the welding torch robotic arm 310, smoothly switching to welding operations on the inner weld seams of other side walls of the workpiece. For chassis and cabinet workpieces of different heights and depths, the changeover can be quickly completed by simply adjusting the opening and closing distance of the clamping blocks 223, the insertion depth of the welding components, and the operating parameters through the control system. No tooling or fixtures need to be changed. After all inner welds are completed, the welding torch robotic arm 310 first returns to its initial position. Motor 2 35 drives the steering block 34 to rotate and reset, completely removing the welding components from the chassis / cabinet. Subsequently, motor 38 drives the fixing plate 39 to reset, and the hydraulic rod 32 retracts, causing the rotating frame 33 to return to its initial position. Then, the motors 227 corresponding to limiters 22 and 21 rotate in opposite directions, driving each set of clamping blocks 223... The clamping mechanism opens outwards synchronously, releasing the workpiece's clamping constraints. The operator can then remove the welded chassis / cabinet from the clamping station. The finished product has a smooth outer surface without weld marks, requiring no additional surface grinding and proceeding directly to the next process. The entire operation can be fully automated via a CNC system, requiring only manual loading and unloading, significantly reducing labor intensity and improving the production efficiency and appearance quality of sheet metal chassis / cabinet welding. Clamping component 2 allows for simultaneous centering and clamping of the bent sheet metal chassis / cabinet in four directions (up, down, left, and right), ensuring accurate and reliable workpiece positioning. This effectively prevents workpiece displacement and warping during internal welding, guaranteeing the positional accuracy and formation of the inner weld seam. Consistency is ensured by employing a single-power synchronous transmission layout, simplifying the drive structure and improving the synchronization of clamping actions. It can flexibly adapt to various sizes and specifications of chassis and cabinet workpieces, offering high flexibility. Through welding component 3, the welding torch can extend into the interior of the bent chassis and cabinet, completing all weld seams only from the inside of the sheet metal. This leaves no visible weld marks, spatter, or ablation marks on the outside of the cabinet, eliminating the need for subsequent surface grinding and recoating processes. Combined with multi-dimensional adjustments for front and rear feed, angle deflection, and height adjustment, as well as the multi-axis linkage capability of the welding torch robotic arm 310, it can comprehensively cover all weld seams inside the cabinet. All operations can be completed in a single clamping, effectively improving welding efficiency and the appearance quality of the finished product.

[0024] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A CNC welding machine for sheet metal chassis and cabinets, comprising: The base (1) is characterized in that a clamping member (2) is provided on the base (1), and a welding member (3) is provided on the clamping member (2); The clamping member (2) includes a limiting member one (21) for limiting the upper and lower ends of the outer side of the bent sheet metal chassis or cabinet, and a limiting member two (22) for limiting the left and right ends of the outer side of the bent sheet metal chassis or cabinet is fixedly provided on the limiting member one (21). The second limiting component (22) includes a guide box (221). A cavity is provided on the side of the guide box (221). A rotating rod (222) is installed through the guide box (221) and is slidably connected to the guide box (221). Two threaded grooves are provided on the outer side of the rotating rod (222) and are mirror-distributed on the rotating rod (222). A clamping block (223) is slidably connected to the guide box (221). The rotating rod (222) passes through the clamping block (223). Two sets of clamping blocks (223) are provided. Each set of clamping blocks (223) is located in the area of ​​each threaded groove on the rotating rod (222), and the clamping block (223) is connected to the threaded groove. The rotating rod (222) is threaded and one end is fixedly connected to an extension column (224). The outer surface of the extension column (224) is fixedly connected to a transmission wheel (225). The guide box (221) is provided in two sets. In each set of guide boxes (221), the outer surface of each set of transmission wheels (225) on the extension column (224) at one end of the rotating rod (222) is fitted with a transmission belt (226). The transmission belt (226) is meshed with the two sets of transmission wheels (225) respectively. In one set of guide boxes (221), a motor (227) is fixedly connected to the side of the guide box (221) away from the extension column (224). The output end of the motor (227) is fixedly connected to the rotating rod (222).

2. The CNC welding machine for sheet metal chassis and cabinets according to claim 1, characterized in that, The guide box (221) is rectangular, and the opening of the cavity inside the guide box (221) faces the side where the sheet metal chassis or cabinet is located. The rotating rod (222) is I-shaped, and the height of the clamping block (223) is consistent with the height of the cavity inside the guide box (221).

3. A CNC welding machine for sheet metal chassis and cabinets according to claim 2, characterized in that, The limiting component (21) also includes a guide box (221), a rotating rod (222), a clamping block (223), an extension column (224), a transmission wheel (225), a transmission belt (226), and a motor (227).

4. A CNC welding machine for sheet metal chassis and cabinets according to claim 3, characterized in that, The bottom end of the guide box (221) in the first limiting member (21) is fixedly connected to the top end of the base (1). The guide box (221) in the second limiting member (22) is fixedly connected to the guide box (221) in the first limiting member (21), and the guide box (221) in the second limiting member (22) is perpendicularly distributed to the guide box (221) in the first limiting member (21).

5. A CNC welding machine for sheet metal chassis and cabinets according to claim 4, characterized in that, The welding member (3) comprises a mounting plate (31) fixedly connected to one set of clamping blocks (223) on the same side inside each of the two sets of guide boxes (221) of the second limiting member (22). A hydraulic rod (32) is fixedly connected to the side of the mounting plate (31) facing the guide boxes (221). Four sets of the hydraulic rods (32) are provided and evenly distributed on the mounting plate (31). The telescopic end of the hydraulic rod (32) penetrates through the mounting plate (31) and is fixedly connected with a rotating frame (33), which is of a "C" shape.

6. A CNC welding machine for sheet metal chassis and cabinets according to claim 5, characterized in that, A steering block (34) is disposed on the inner side of the rotating frame (33) along the height direction of the rotating frame (33). The steering block (34) is U-shaped in top view, with an arc surface on one side and a flat surface on the other side, and the upper and lower ends of the steering block (34) are rotatably connected to the rotating frame (33). A second motor (35) is fixedly connected to the top end of the rotating frame (33), and the output end of the second motor (35) penetrates through the rotating frame (33) and is fixedly connected to the steering block (34).

7. A CNC welding machine for sheet metal chassis and cabinets according to claim 6, characterized in that, A lifting frame (36) is fixedly connected to the flat surface side of the steering block (34). A worm (37) is disposed inside the lifting frame (36), penetrates through the upper and lower ends of the lifting frame (36), and is rotatably connected with the lifting frame (36). A third motor (38) is fixedly connected to the top end of the lifting frame (36), and the output end of the third motor (38) is fixedly connected to the worm (37). A fixing plate (39) is slidably connected inside the lifting frame (36), the worm (37) penetrates through the fixing plate (39) and is in meshed connection with the fixing plate (39), and one end of the fixing plate (39) is fixedly connected with a welding gun manipulator (310).

8. A CNC welding machine for sheet metal chassis and cabinets according to claim 7, characterized in that, The welding gun manipulator (310) is mainly composed of a base, multiple articulated arm segments, a servo drive mechanism, an end clamping seat and a welding gun. During operation, the servo motor drives the arm segments to perform multi-axis linkage, flexibly changing position according to a preset trajectory, driving the welding gun to accurately reach the weld seams at all positions of the case and cabinet, so as to complete continuous and stable numerically controlled welding operations.

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