Agricultural machinery outer frame welding device and welding method thereof

Abstract

The application relates to a welding device for an agricultural machinery outer frame and a welding method thereof, and relates to the technical field of welding. The device comprises a fixing frame, a welding manipulator arranged on one side of the fixing frame, a mounting frame and a moving frame. The mounting frame is rotationally connected with the fixing frame and can be axially flipped through a driving assembly arranged on the fixing frame. The moving frame is oppositely arranged with the mounting frame and is slidably connected with the mounting frame, so that the moving frame can slide towards or away from the mounting frame. The moving frame and the inner side of the mounting frame are both provided with transmission assemblies, and the transmission assemblies of the moving frame and the mounting frame are matched to clamp the agricultural machinery outer frame to be welded and drive the agricultural machinery outer frame to translate and convey. The application realizes efficient clamping and conveying, flexible type changing, adaptability and stable and accurate flipping of the agricultural machinery frame during the welding process, and significantly improves the automation degree, production efficiency and welding quality of the welding operation.

Description

Technical Field

[0001] This invention relates to the field of welding technology, specifically to a welding device and welding method for the outer frame of agricultural machinery. Background Technology

[0002] As the load-bearing base of the entire machine, the welding quality of the outer frame of agricultural machinery directly affects the service life and operational safety of the machine. Currently, agricultural machinery frames are mostly welded from rectangular tubes, channel steel, and other structural steels. Their large structural dimensions and complex weld distribution place high demands on the positioning accuracy and ease of operation during the welding process.

[0003] In existing technologies, the welding of agricultural machinery frames mainly relies on manual welding or semi-automatic plasma arc welding machines. Traditional welding methods have the following drawbacks: First, workpiece clamping and positioning are difficult; large frames are prone to displacement during welding, affecting welding accuracy. Second, the welding process requires multiple flipping of the workpiece to complete welds at different locations; existing tooling mostly uses fixed structures, making the flipping operation cumbersome and labor-intensive. Third, workpiece loading and unloading efficiency is low; the loading and unloading process consumes a significant amount of time, making it difficult to meet the needs of mass production.

[0004] To address these issues, some improved welding fixtures have adopted a flipping mechanism. For example, some existing agricultural machinery frame assembly welding fixtures use a servo motor to drive the welding base plate to rotate 360°, achieving workpiece flipping during welding. Similarly, some existing automated welding intelligent robots use a welding flipping mechanism, employing a geared motor and ball screw to clamp and flip the workpiece. However, these solutions still have the following technical drawbacks: First, the clamping mechanism and the conveying mechanism are designed separately, requiring the workpiece to be re-clamped after each weld seam is completed to adjust the welding position, resulting in less smooth process transitions; second, the flipping angle control accuracy is limited, easily leading to over-flipping or inaccurate positioning; third, the belt in the belt drive structure is prone to friction with the inner wall of the mounting groove, increasing transmission resistance and accelerating belt wear; fourth, workpiece loading and unloading still require manual assistance, and the level of automation needs improvement.

[0005] Furthermore, existing welding equipment has limitations in adapting to different frame specifications. Agricultural machinery frames come in various models and vary greatly in size, while traditional tooling has a limited adjustment range, making it difficult to achieve flexible production. At the same time, workpiece movement during the welding process relies heavily on external conveying equipment, which is not well coordinated with the welding process, affecting production efficiency.

[0006] Therefore, how to provide an agricultural machinery frame welding device that can achieve integrated operation of workpiece clamping, flipping and conveying, and is accurate in positioning, convenient in adjustment and efficient in loading and unloading has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] To address the aforementioned technical problems in the prior art, this invention proposes a welding device and welding method for the outer frame of agricultural machinery.

[0008] The technical solution adopted by the present invention to solve the above problems is as follows: This invention provides a welding device for the outer frame of agricultural machinery, including a fixed frame and a welding robot located on one side of the fixed frame. The welding device also includes a mounting frame and a movable frame. The mounting frame is rotatably connected to the fixed frame and can be axially rotated by a drive component mounted on the fixed frame. The movable frame is arranged opposite to the mounting frame and slidably connected to the mounting frame, allowing it to slide towards or away from the mounting frame. Both the movable frame and the mounting frame have transmission components on their inner sides. The transmission components of the movable frame and the mounting frame cooperate with each other to clamp the outer frame of the agricultural machinery to be welded and drive the outer frame of the agricultural machinery to be translated and transported.

[0009] Furthermore, the transmission assembly includes a transmission belt, with both ends of the transmission belt respectively fitted onto corresponding transmission columns. The transmission columns are rotatably connected to the mounting frame or the movable frame. One of the transmission columns located on the mounting frame is fixedly connected to the output end of the conveying motor. The conveying motor is fixedly installed on the mounting frame.

[0010] Furthermore, both the mounting frame and the movable frame have an embedding groove on their inner sides, the transmission belt is located inside the embedding groove, and the part of the transmission belt protruding from the embedding groove abuts against the outer frame of the agricultural machinery.

[0011] Furthermore, both sides of the mounting frame and the movable frame are provided with support blocks, and the bottom of both the mounting frame and the movable frame are fixed with brackets, which are located between the two support blocks.

[0012] Furthermore, the movable frame is a U-shaped frame.

[0013] Furthermore, mounting bases are fixed at both ends of the movable frame. One mounting base is slidably connected to the mounting frame, and the other mounting base is connected to an electric slide rail, which is fixedly connected to the mounting frame. The electric slide rail drives the movable frame to move on the mounting frame, thereby adjusting the distance between the movable frame and the mounting frame.

[0014] Furthermore, the drive assembly includes a drive motor, which is mounted on one side of the fixed frame. The mounting frame has cylindrical shafts at both ends. The cylindrical shaft of the mounting frame near the drive motor passes through the fixed frame and is fixedly connected to the drive motor. The cylindrical shaft of the mounting frame away from the drive motor is rotatably connected to the fixed frame.

[0015] Furthermore, a limiting bearing is fixed to the end of the fixed frame facing away from the drive motor, and the cylindrical shaft of the mounting frame facing away from the drive motor is fixed in the inner ring of the limiting bearing. The limiting bearing is distributed opposite to the drive motor. When the drive motor drives the mounting frame to rotate on the fixed frame, the mounting frame drives the movable frame to rotate accordingly, and the limiting bearing is used to limit the rotation angle of the mounting frame.

[0016] The present invention also provides a method for welding the outer frame of agricultural machinery, which is achieved by the above-mentioned welding device, and the welding method includes the following steps: Step 1: Place the outer frame of the agricultural machinery to be welded between the movable frame and the mounting frame. Move the movable frame towards the mounting frame via the electric slide rail, thereby clamping and fixing the outer frame of the agricultural machinery with the transmission belts on the movable frame and the mounting frame. At the same time, the bracket and the support block cooperate to provide support for the bottom of the outer frame of the agricultural machinery. Step 2: Set the number of welding robots according to the process requirements for welding the outer frame of agricultural machinery, and set the welding method for each welding robot according to the process requirements for welding the outer frame. Step 3: Start the drive motor to drive the mounting frame to rotate around its own axis, causing the moving frame and the clamped outer frame to rotate as a whole. The rotation angle of the mounting frame is limited by the limit bearing to keep the outer frame in a suitable welding position. Start the welding robot on the outside of the fixed frame to weld the welding end to the unwelded parts of the agricultural machinery outer frame. After the welding at the current station is completed, the drive motor can be started again to fine-tune the rotation angle of the mounting frame to complete the welding of different positions on the outer frame. Step 4: After Step 3 is completed, the drive motor drives the mounting frame and the outer frame of the agricultural machinery to rotate to the initial horizontal position. When one of the welding robots welds the outer frame and the outer frame needs to switch welding positions, the conveyor motor is started to drive the drive belt on the mounting frame to rotate. The drive belt on the moving frame moves synchronously, thereby driving the outer frame to move forward or backward, so that the welding robots in other positions can weld the outer frame. Step 5: After all the welding robots have completed welding of the outer frame, the conveyor motor is restarted to drive the transmission belt on the mounting frame to transport the welded outer frame outward, thereby realizing the detachment of the outer frame from the device. Step 6: Place the new frame to be welded and proceed to the next welding cycle.

[0017] The beneficial effects of this invention are: 1. This invention integrates clamping and conveying functions by incorporating a transmission structure consisting of a drive belt, drive column, and conveyor motor on both the mounting frame and the moving frame. The drive belt serves both as a clamp to fix the agricultural machinery frame and as a means to drive the frame's movement through its own rotation. This design allows the agricultural machinery frame to move stepwise via the drive belt driven by the conveyor motor after each weld is completed, without the need for re-clamping, thus seamlessly connecting to the next welding position. Simultaneously, after welding, the agricultural machinery frame can be automatically unloaded via the drive belt rotation, and new workpieces can be loaded and clamped simultaneously. This significantly simplifies the operation process, improves the smoothness of process connections and loading / unloading efficiency, and creates conditions for automated assembly line operations.

[0018] 2. This invention uses an electric slide rail to move the mobile frame on the mounting frame, allowing for precise adjustment of the distance between the mobile frame and the mounting frame. Combined with a flexible transmission belt, it can adaptively clamp agricultural machinery frames of different widths and sizes. This structure greatly enhances the versatility and flexible production capabilities of the device, enabling rapid switching between different frame models without changing tooling, while ensuring clamping stability and positioning accuracy.

[0019] 3. This invention uses a drive motor to rotate the mounting frame, thereby causing the clamped agricultural machinery frame to rotate as a whole, adjusting the welds of each part of the agricultural machinery frame to the position most conducive to the operation of the welding robot. Simultaneously, by setting limit bearings on the fixed frame, the rotation angle of the mounting frame is precisely limited, effectively avoiding positioning deviations or safety accidents caused by excessive rotation of the agricultural machinery frame. This automatic rotation structure replaces the traditional manual or semi-mechanical rotation method, significantly reducing labor intensity and improving welding accessibility and the accuracy of welding posture.

[0020] 4. In this invention, the drive belt is embedded in the embedding groove, and the drive belt does not contact the inner wall of the embedding groove, but only relies on the part protruding from the embedding groove to abut against the frame. This structural design effectively avoids the drive belt from rubbing against the groove wall during transmission or when it is turning with the frame, which not only reduces transmission resistance and energy loss, but also significantly extends the service life of the belt and ensures long-term operational reliability.

[0021] 5. The mounting frame of this invention features a U-shaped side structure, with the upper part of the movable frame positioned on top of the mounting frame. This unique structural layout allows external equipment (such as cranes or conveyor belts) to easily place or remove the agricultural machinery frame into the working area between the mounting frame and the movable frame. Combined with the automatic loading and unloading function of the conveyor motor, this significantly optimizes the workpiece logistics process, shortens auxiliary time, and improves overall production efficiency.

[0022] 6. This invention achieves efficient clamping and conveying, flexible changeover and stable and precise rotation of agricultural machinery frames during the welding process by integrating a belt structure for clamping and conveying, an electric slide rail with adjustable spacing, and a tilting drive with limit protection. This significantly improves the automation level, production efficiency and welding quality of welding operations. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a diagram showing the connection structure between the mounting bracket and the fixing bracket in this invention; Figure 3 for Figure 2 Another usage scenario diagram; Figure 4 This is a schematic diagram showing the distribution of the movable frame and the mounting frame in this invention; Figure 5 This is a diagram showing the connection structure between the bracket and the mounting bracket in this invention; Figure 6 This is a schematic diagram showing the connection between the transmission belt and the moving frame in this invention; Figure 7 for Figure 5 Enlarged view of section B; Figure 8 for Figure 5 Enlarged view of section A.

[0024] 1-Welding robot; 2-Fixed frame; 21-Drive motor; 22-Moving frame; 23-Mounting frame; 231-Horizontal rod; 232-Vertical rod; Fixed rod-233; 24-Drive belt; 241-Embedded groove; 242-Drive column; 25-Conveyor motor; 26-Bracket; 27-Block; 28-Electric slide rail; 29-Mounting base; 3-Limit bearing. Detailed Implementation

[0025] Specific implementation method one: Combining Figures 1 to 8 This embodiment provides a welding device for the outer frame of agricultural machinery, including a fixed frame 2 and a welding robot 1 located on one side of the fixed frame 2. The welding device also includes a mounting frame 23 and a movable frame 22. The mounting frame 23 is rotatably connected to the fixed frame 2 and can be axially rotated by a drive component mounted on the fixed frame 2. The movable frame 22 is arranged opposite to the mounting frame 23 and slidably connected to the fixed frame 2, allowing it to slide towards or away from the mounting frame 23. Both the movable frame 22 and the mounting frame 23 have transmission components on their inner sides. The transmission components of the movable frame 22 and the mounting frame 23 cooperate with each other to clamp the outer frame of the agricultural machinery to be welded and drive the outer frame to move and transport horizontally.

[0026] The fixing frame 2 includes a base, and uprights for connecting to the mounting frame 23 are symmetrically provided on both sides of the upper surface of the base. When the mounting frame 23 is manufactured, the side of the mounting frame 23 has a Z-shaped structure, and the upper part of the movable frame 22 is located on the upper part of the mounting frame 23. The advantage of this design is that it allows external equipment to drive the outer frame of agricultural machinery to be placed between the mounting frame 23 and the movable frame 22, and it also facilitates the unloading of agricultural machinery frames between the mounting frame 23 and the movable frame 22. Specifically, the mounting frame 23 has two U-shaped brackets on each side, and the middle part of the horizontal rods 231 of the two U-shaped brackets is connected to a corresponding vertical frame; the four vertical rods L-shaped rods 232 of the two U-shaped brackets form four connecting ends, of which the two connecting ends closer to the robot arm 1 are connected by a fixed rod 233; the two connecting ends on the other side are connected by a movable frame 22.

[0027] The movable frame 22 is a U-shaped frame. Mounting seats 29 are fixed to the lower parts of both ends of the movable frame 22. One mounting seat 29 is slidably connected to the mounting frame 23, and the other mounting seat 29 is connected to an electric slide rail 28, which is mounted on the other connecting end. Specifically, one connecting end of the movable frame 22 has a slider that slides in cooperation with the mounting seat 29, and a groove on the lower surface of the mounting seat 29 slides in cooperation with the slider. The other connecting end is equipped with the electric slide rail 28. By activating the electric slide rail 28, the movable frame 22 moves on the mounting frame 23, thereby adjusting the distance between the movable frame 22 and the mounting frame 23.

[0028] The transmission assembly includes a transmission belt 24, with both ends of the transmission belt 24 respectively fitted onto corresponding transmission columns 242. The transmission columns 242 are rotatably connected to the mounting frame 23 or the movable frame 22. One of the transmission columns 242 located on the mounting frame 23 is fixedly connected to the output end of a conveyor motor 25, which is fixedly mounted to the mounting frame 23. The transmission belt 24 and the transmission column 242 are fixedly fitted around their outer peripheries, and both rotate synchronously. The transmission column on the mounting frame 23 is driven by the conveyor motor 25 and is the active end, while the transmission belt 24 and transmission column 242 on the movable frame 22 are the follower and driven ends.

[0029] In some embodiments, both the mounting bracket 23 and the movable bracket 22 have an embedding groove 241 on their inner sides. The transmission belt 24 is located inside the embedding groove 241, and the portion of the transmission belt 24 protruding from the embedding groove 241 abuts against the outer frame. The transmission belt 24 is an elastic belt. The transmission belt 24 on the mounting bracket 23 and the transmission belt 24 on the movable bracket 22 move synchronously. The transmission belt 24 is a ring-shaped belt with a rough outer surface and elasticity, and the transmission belt 24 does not contact the inner wall of the embedding groove 241.

[0030] In some embodiments, the inner sides of both ends of the mounting frame 23 and the movable frame 22, i.e., the two vertical ends, are provided with support blocks 27, and the bottom of both the mounting frame 23 and the movable frame 22 is fixed with brackets 26, which are located between the two support blocks 27. The brackets and support blocks cooperate to provide support for the bottom of the outer frame, so that the outer frame is clamped between the mounting frame and the movable frame, preventing it from shifting or falling. With the help of belt drive, the outer frame is smoothly moved and fed horizontally.

[0031] The drive assembly includes a drive motor 21, which is mounted on one side of the fixed frame 2. The mounting frame 23 has cylindrical shafts at both ends. The cylindrical shaft of the mounting frame 23 near the drive motor 21 passes through the fixed frame 2 and is fixedly connected to the drive motor 21. The cylindrical shaft of the mounting frame 23 away from the drive motor 21 is rotatably connected to the fixed frame 2.

[0032] Preferably, a limiting bearing 3 is fixed at one end of the fixed frame 2 away from the drive motor 21, and the cylindrical shaft of the mounting frame 23 at one end away from the drive motor 21 is fixed in the inner ring of the limiting bearing 3. The limiting bearing is distributed opposite to the drive motor 21.

[0033] When the agricultural machinery frame is fixed between the mounting frame 23 and the movable frame 22, the drive motor 21 starts, causing the mounting frame 23 to rotate as a whole around its two cylindrical axes. As the mounting frame rotates, the movable frame 22 and the clamped outer frame of the agricultural machinery also rotate together with the frame. This facilitates the welding end of the welding robot 1 to weld and fix the agricultural machinery frame, thereby improving the welding convenience of the agricultural machinery frame. The welding robot 1 is an ion arc welding robot. When the mounting frame 23 and the moving frame 22 drive the outer frame of the agricultural machinery to rotate, the shaft at the end of the mounting frame 23 away from the motor rotates together with the limit bearing 3. When it rotates to the set angle, the limit bearing 3 generates a limit to prevent the mounting frame 23 from continuing to rotate, so as to limit the rotation angle and thus avoid excessive rotation of the outer frame of the agricultural machinery, so as to enable the welding robot 1 to quickly weld and fix the agricultural machinery frame. After the outer frame of the agricultural machinery is welded, the output shaft of the drive motor 21 drives the outer frame of the agricultural machinery to rotate and reset the angle. The drive motor 21 is a brake motor that can be purchased on the market. Then the output shaft of the conveyor motor 25 can drive the drive belt 24 to rotate through the drive column 242. At this time, the drive belt 24 can drive the outer frame of the agricultural machinery to move, so that the welding robot 1 can weld other parts of the outer frame of the agricultural machinery.

[0034] After the outer frame of the agricultural machinery is fully welded, the output shaft of the conveyor motor 25 can drive the transmission belt 24 to rotate through the transmission column 242. At this time, the transmission belt 24 can drive the outer frame of the agricultural machinery to separate from the device. At the same time, the external equipment can also drive the unwelded agricultural machinery frame to be placed between the mobile frame 22 and the mounting frame 23, thereby realizing the quick fixation of the unwelded agricultural machinery frame on the device, and also facilitating the quick separation of the welded agricultural machinery frame from the device.

[0035] This embodiment integrates a belt structure for clamping and conveying, an electric slide rail with adjustable spacing, and a tilting drive with limit protection. This enables efficient clamping and conveying, flexible changeover, and stable and precise tilting of agricultural machinery frames during the welding process, significantly improving the automation level, production efficiency, and welding quality of welding operations.

[0036] Specific Implementation Method Two: This implementation method provides a welding method for the outer frame of agricultural machinery, which is completed using the welding device described in Implementation Method One above. The welding device includes a fixed frame 2 and a welding robot 1 located on one side of the fixed frame 2. The welding device also includes a mounting frame 23 and a movable frame 22. The mounting frame 23 is rotatably connected to the fixed frame 2 and is axially rotated by a drive component mounted on the fixed frame 2. The movable frame 22 is arranged opposite to the mounting frame 23 and is slidably connected to the fixed frame 2, so that it can slide towards or away from the mounting frame 23. The inner sides of the movable frame 22 and the mounting frame 23 are provided with transmission components. The transmission components of the movable frame 22 and the mounting frame 23 cooperate with each other to clamp the outer frame to be welded and drive the outer frame to move and transport horizontally.

[0037] The welding method includes the following steps: Step 1, Installation: The outer frame to be welded is placed between the movable frame 22 and the mounting frame 23. The movable frame 22 is moved toward the mounting frame 23 by the electric slide rail 28, so that the transmission belt 24 on the movable frame 22 and the mounting frame 23 clamps and fixes the outer frame of the agricultural machinery. At the same time, the bracket 26 and the support block 27 cooperate to provide support for the bottom of the outer frame. When the outer frame of the agricultural machinery is fixed between the mobile frame 22 and the mounting frame 23, the welding end of the welding robot 1 can weld the outer frame of the agricultural machinery. During the welding process of the agricultural machinery frame, external equipment can assemble parts on the unwelded parts of the outer frame of the agricultural machinery, thereby realizing portable welding of the outer frame of the agricultural machinery. Step Two, Control: The staff can set the number of welding robots 1 according to the process requirements of welding the outer frame, and at the same time set the welding method of each welding robot 1 according to the process requirements of welding the outer frame. Step 3: Flip: Start the drive motor 21 to drive the mounting frame 23 to rotate around its own axis, causing the moving frame 22 and the clamped outer frame to rotate as a whole. The rotation angle of the mounting frame 23 is limited by the limit bearing to keep the outer frame in a suitable welding position. Start the welding robot 1 on the outside of the fixed frame 2 to weld the unwelded parts of the agricultural machinery outer frame. After the welding at the current station is completed, the drive motor 21 can be started again to finely adjust the rotation angle of the mounting frame 23 to complete the welding of different positions of the outer frame. Step 4: Move: After step three is completed, the output shaft of the transmission motor 21 drives the outer frame of the agricultural machinery to rotate to the initial horizontal position. When one of the welding robots 1 welds the outer frame and the outer frame needs to switch welding positions, the conveyor motor 25 is started to drive the transmission belt 24 on the mounting frame 23 to rotate. The transmission belt on the moving frame 22 moves synchronously, thereby driving the outer frame to move forward or backward, so that the welding robots 1 in other positions can weld the outer frame. Step 5: Conveying After all the welding robots 1 have completed welding of the outer frame, the conveyor motor 25 is started again to drive the transmission belt 24 on the mounting frame 23 to move, thus conveying the welded outer frame outward and realizing the detachment of the outer frame from the device; at the same time, the external equipment can also move the unwelded agricultural machinery frame to be placed between the moving frame 22 and the mounting frame 23, thereby realizing the quick fixation of the unwelded agricultural machinery frame on the device, and also facilitating the quick separation of the welded agricultural machinery frame from the device.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present invention, based on the technical essence of the present invention and within the spirit and principles of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A welding device for the outer frame of agricultural machinery, comprising a fixed frame (2) and a welding robot (1) located on one side of the fixed frame (2), characterized in that: The welding device also includes a mounting frame (23) and a movable frame (22). The mounting frame (23) is rotatably connected to the fixed frame (2) and is axially rotated by a drive assembly mounted on the fixed frame (2). The movable frame (22) is arranged opposite to the mounting frame (23) and is slidably connected to the mounting frame (23), so that it can slide toward the mounting frame (23) or slide away from the mounting frame (23). The inner sides of the movable frame (22) and the mounting frame (23) are provided with transmission assemblies. The transmission assemblies of the movable frame (22) and the mounting frame (23) cooperate with each other to clamp the outer frame of the agricultural machinery to be welded and drive the outer frame of the agricultural machinery to be translated and transported.

2. The agricultural machinery outer frame welding device according to claim 1, characterized in that: The transmission assembly includes a transmission belt (24), with both ends of the transmission belt (24) respectively fitted onto corresponding transmission columns (242). The transmission columns (242) are rotatably connected to the mounting frame (23) or the movable frame (22). One of the transmission columns (242) located on the mounting frame (23) is fixedly connected to the output end of the conveying motor (25). The conveying motor (25) is fixedly installed on the mounting frame (23).

3. The agricultural machinery outer frame welding device according to claim 2, characterized in that: The mounting frame (23) and the movable frame (22) are both provided with an embedding groove (241) on their inner sides. The transmission belt (24) is located inside the embedding groove (241), and the part of the transmission belt (24) that protrudes from inside the embedding groove (241) abuts against the outer frame of the agricultural machinery.

4. The agricultural machinery outer frame welding device according to claim 3, characterized in that: Both sides of the mounting frame (23) and the movable frame (22) are provided with support blocks (27), and the bottom of the mounting frame (23) and the movable frame (22) are fixed with brackets (26), and the brackets (26) are located between the two support blocks (27).

5. The agricultural machinery outer frame welding device according to claim 4, characterized in that: The mobile frame (22) is a U-shaped frame.

6. The agricultural machinery outer frame welding device according to claim 5, characterized in that: The lower ends of the movable frame (22) are fixed with mounting bases (29), one of the mounting bases (29) is slidably connected to the mounting frame (23), and the other mounting base (29) is connected to an electric slide rail (28), which is fixedly connected to the mounting frame (23).

7. The agricultural machinery outer frame welding device according to claim 6, characterized in that: The drive assembly includes a drive motor (21), which is mounted on one side of the fixed frame (2). The mounting frame (23) has cylindrical shafts at both ends. The cylindrical shaft of the mounting frame (23) near the drive motor (21) passes through the fixed frame (2) and is fixedly connected to the drive motor (21). The cylindrical shaft of the mounting frame (23) away from the drive motor (21) is rotatably connected to the fixed frame (2).

8. The agricultural machinery outer frame welding device according to claim 7, characterized in that: The fixed frame (2) has a limit bearing (3) fixed at one end away from the drive motor (21), and the cylindrical shaft of the mounting frame (23) at one end away from the drive motor (21) is fixed in the inner ring of the limit bearing (3). The limit bearing is distributed relative to the drive motor (21).

9. A method for welding the outer frame of agricultural machinery, implemented using the welding apparatus described in any one of claims 1 to 8, characterized in that, The welding method includes the following steps: Step 1: Place the outer frame of the agricultural machinery to be welded between the movable frame (22) and the mounting frame (23). Move the movable frame (22) towards the mounting frame (23) via the electric slide rail (28), thereby clamping and fixing the outer frame of the agricultural machinery with the transmission belts (24) on the movable frame (22) and the mounting frame (23); at the same time, the bracket (26) and the support block (27) cooperate to provide support for the bottom of the outer frame of the agricultural machinery. Step 2: Set the number of welding robots (1) according to the process requirements of welding the outer frame of agricultural machinery, and set the welding method of each welding robot (1) according to the process requirements of welding the outer frame. Step 3: Start the drive motor (21) to drive the mounting frame (23) to rotate around its own axis, causing the moving frame (22) and the clamped outer frame to rotate as a whole. The rotation angle of the mounting frame (23) is limited by the limit bearing (3) so that the outer frame is kept in a suitable welding position. Start the welding robot (1) on the outside of the fixed frame (2) to weld the welding end to the unwelded parts of the agricultural machinery outer frame. After the welding at the current work station is completed, the drive motor (21) can be started again to finely adjust the rotation angle of the mounting frame (23) to complete the welding of different positions of the outer frame. Step 4: After step 3 is completed, the drive motor (21) drives the mounting frame 23 and the outer frame of the agricultural machinery to rotate to the initial horizontal position. When one of the welding robots (1) welds the outer frame, and the outer frame needs to switch welding positions, the conveyor motor (25) is started to drive the drive belt (24) on the mounting frame (23) to rotate. The drive belt (24) on the moving frame (22) moves synchronously, thereby driving the outer frame to move forward or backward, so that the welding robots (1) in other positions can weld the outer frame. Step 5: After all the welding robots (1) have completed welding of the outer frame, start the conveyor motor (25) again to drive the transmission belt (24) on the mounting frame (23) to move, and transport the welded outer frame outward to realize the outer frame detachment from the device; Step 6: Place the new frame to be welded and proceed to the next welding cycle.

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