Ultra-high-precision front door robot fender welding tool
By designing an ultra-high precision front door robot fender welding fixture, multiple clamping mechanisms are used to accurately position and clamp the fender, solving the problem that traditional fixtures are difficult to adapt to the contours of the fender and mudguard, and achieving high-precision welding and improved aesthetics of the car's exterior.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-13
- Publication Date
- 2026-04-14
AI Technical Summary
Traditional robotic fender welding fixtures for front doors struggle to accurately fit the contours and key positioning points of the fenders and mudguards, resulting in minute displacements of components during welding, which affects welding accuracy and the aesthetics of the car's exterior.
An ultra-high precision welding fixture for front door robot fenders was designed. Multiple clamping mechanisms are used to accurately position and clamp the fenders from different angles and positions. These include a first clamping mechanism, a second clamping mechanism, a third clamping mechanism, a fourth clamping mechanism, and a fourth innovative point. These clamping mechanisms securely clamp the fenders, ensuring the relative positional accuracy between the fenders and the fenders.
This improved the accuracy and overall flatness of the welding, ensuring that the connection between the fender and the mudguard meets high-precision requirements after welding, thus enhancing the aesthetics of the car's appearance and the overall assembly precision.
Smart Images
Figure CN224115483U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of automobile manufacturing technology, and in particular relates to an ultra-high precision welding fixture for front door robot fenders. Background Technology
[0002] In the automobile manufacturing process, the welding precision of the fenders during the welding of the front door robot indirectly affects the installation of the mudguards. If the welding position of the fender is off, the mudguards may not be installed accurately, or the gap between them and components such as the tires may be unreasonable after installation, affecting the normal function of the mudguards.
[0003] In traditional robotic welding fixtures for front door fenders, the positioning of components such as fenders and fenders is often not precise enough. Due to the complex shapes of fenders and fenders, traditional fixtures struggle to accurately fit their contours and key positioning points. This leads to slight displacement of components during welding, resulting in uneven gaps between the welded front door and fender, affecting the aesthetics of the car's exterior and overall assembly accuracy. Utility Model Content
[0004] In view of this, the present invention aims to propose an ultra-high precision front door robot fender welding fixture to solve the problem that traditional fixtures are difficult to accurately fit the contour and key positioning points, which leads to the component being prone to slight displacement during the welding process. This results in uneven gaps between the welded front door and fender, affecting the aesthetics of the car's appearance and the overall assembly accuracy.
[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:
[0006] This utility model provides an ultra-high precision welding fixture for the fender of a front door robot, including a fender, a mudguard, and a fender clamping mechanism for fixing the fender. The fender clamping mechanism is bolted to the mounting platform. The fender is connected to the clamping mudguard. The four corners of the mounting platform are fixed with the moving wheel connecting plate, and the moving wheel connecting plate is connected to the moving wheel. The four corners of the upper surface of the mounting platform are locked with lifting lugs. The fender clamping mechanism includes a first clamping mechanism, a second clamping mechanism, a third clamping mechanism, and a fourth clamping mechanism. Each of the fender clamping mechanisms is provided with a clamping mechanism fixing seat. The clamping mechanism fixing seat is provided with a reinforcing rib in the middle and is installed on the upper surface of the mounting platform.
[0007] Furthermore, the first clamping mechanism is located at the edge of the fender. A first mounting plate is locked to the vertical mounting plate of the clamping mechanism fixing seat. Several first pads are locked to the upper surface of the first mounting plate. A first L-shaped mounting block is fixed to the front of the first mounting plate. A first positioning pin mounting seat is fixed to the side of the first L-shaped mounting block. The first positioning pin mounting seat fixes the positioning pin with a first locking bolt. The positioning pin is fixed to a groove at the edge of the fender. A protrusion is provided at the upper end of the first mounting plate. Rotary connecting plates are bolted to both the front and rear surfaces of the protrusion. The two rotary connecting plates are connected by a first connecting shaft and an inclined... The connecting plates are connected, and the other end of the inclined connecting plate is connected to the first clamping mounting plate via a connecting shaft. The lower end face of the first clamping mounting plate is connected to the second pad. The rotating connecting plate is provided with a groove, and a second connecting shaft is provided directly below the groove and connected to the bending connecting plate. The vertical connecting section at the lower part of the bending connecting plate passes through the second connecting shaft. The bent part of the bending connecting plate is connected to another symmetrically arranged bending connecting plate and a short connecting plate via a third connecting shaft. The other end of the short connecting plate is connected to the middle part of the inclined connecting plate. A fourth connecting shaft is connected to the bent connecting section at the upper part of the bending connecting plate, and the fourth connecting shaft is connected to the locking handle.
[0008] Furthermore, the second clamping mechanism is adjacent to the first clamping mechanism. A second mounting plate is locked onto the vertical mounting plate of the clamping mechanism's fixed base. A first L-shaped mounting block is locked onto the upper surface of the second mounting plate. A first pad is locked onto the first L-shaped mounting block. The second mounting plate has a protrusion. Both the front and rear surfaces of the protrusion are provided with rotating connecting plates locked by bolts. The two rotating connecting plates are connected to an inclined connecting plate via a first connecting shaft. The other end of the inclined connecting plate is connected to the second clamping mounting plate via a connecting shaft. The second clamping mounting plate is connected to the first mounting plate via a clamping connecting block. The side of the second clamping mounting plate is connected to a first fixing block, and the top is connected to a second fixing block. The second fixing block is locked to the second positioning pin mounting base. Positioning pins are fixed on the second mounting base, and the positioning pins are fixed to the slots on the fenders. A first L-shaped mounting block is fixed on the second mounting plate, and several first pads are locked on the first L-shaped mounting block. The first pads are adapted to the shape of the fenders. The rotating connecting plate is provided with a groove, and a second connecting shaft is provided directly below the groove and connected to the bending connecting plate. The second connecting shaft passes through the vertical connecting section at the bottom of the bending connecting plate. The bending part of the bending connecting plate is connected to another symmetrically arranged bending connecting plate and a short connecting plate through a third connecting shaft. The other end of the short connecting plate is connected to the middle of the inclined connecting plate. A fourth connecting shaft is connected to the bending connecting section at the top of the bending connecting plate, and the fourth connecting shaft is connected to the locking handle.
[0009] Furthermore, a third clamping mechanism is located at the connection between the fender and the mudguard. The third mounting plate is locked onto the vertical mounting plate of the clamping mechanism fixing seat. The upper end of the third mounting plate has a protrusion. Both the front and rear surfaces of the protrusion are provided with rotating connecting plates that are locked by bolts. The two rotating connecting plates are connected to the inclined connecting plate through a first connecting shaft. The other end of the inclined connecting plate is connected to the third clamping mounting plate through a connecting shaft. The third clamping mounting plate is F-shaped. The third clamping mounting plate is connected to the third mounting plate through a clamping connecting block. The third clamping mounting plate is connected to the connecting fixing block through a connecting block. The connecting fixing block is locked to the first contact block. The surface of the first contact block that contacts the fender is adapted to its contact surface. Two horizontally extending connecting sections on the third clamping mounting plate are connected to the second contact block. Several gaskets are provided between the third clamping mounting plate and the second contact block. Several gaskets are provided between the connecting fixing block and the first contact block.
[0010] Furthermore, the fourth clamping mechanism is located on the opposite side between the second and third clamping mechanisms. The second mounting plate is locked to the vertical mounting plate of the clamping mechanism's fixed base. The upper end face of the second mounting plate is locked, and the first pad is locked to the first L-shaped mounting block. The second mounting plate has a protrusion, and both the front and rear surfaces of the protrusion are provided with rotating connecting plates locked by bolts. The two rotating connecting plates are connected to an inclined connecting plate via a first connecting shaft. The other end of the inclined connecting plate is connected to the fourth clamping mounting plate via a connecting shaft. The fourth clamping mounting plate is connected to the second mounting plate via a clamping connecting block. The side of the fourth clamping mounting plate is connected to the second L-shaped mounting block, the third L-shaped mounting block, and the fourth L-shaped mounting block. The mounting blocks include a third L-shaped mounting block and a fourth L-shaped mounting block, the bottom of which are adapted to the upper surface of the fender. A first pad is connected to the second mounting plate, and the first pad is adapted to the upward-bent side of the fender. A groove is provided on the rotating connecting plate, and a second connecting shaft is provided directly below the groove, connecting to the bending connecting plate. The second connecting shaft passes through the vertical connecting section at the lower part of the bending connecting plate. The bending part of the bending connecting plate is connected to another symmetrically arranged bending connecting plate and a short connecting plate through a third connecting shaft. The other end of the short connecting plate is connected to the middle of the inclined connecting plate. A fourth connecting shaft is connected to the bending connecting section at the upper part of the bending connecting plate, and the fourth connecting shaft is connected to the locking handle.
[0011] Furthermore, both the first and second pads are made of rubber.
[0012] Compared with existing technologies, the ultra-high precision front door robot fender welding fixture described in this utility model has the following advantages:
[0013] The fender clamping mechanism of this utility model can firmly clamp the fender from multiple positions according to the fender contour and welding requirements, ensuring the relative positional accuracy between the fender and the mudguard, thereby improving the accuracy of welding, ensuring that the connection between the two after welding meets the high precision requirements, and improving the overall flatness and aesthetics of the car's appearance.
[0014] In this invention, the first, second, third, and fourth clamping mechanisms clamp the fender from different angles and positions, ensuring that the fender receives uniform clamping force during welding and effectively preventing deformation due to uneven local stress. Different clamping mechanisms can precisely position and clamp different parts of the fender; for example, some mechanisms fix the edges of the fender, while others position key connection points, thus comprehensively ensuring the positional accuracy of the fender during welding, improving welding quality, and meeting the requirements of ultra-high precision welding. Attached Figure Description
[0015] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.
[0016] In the attached diagram:
[0017] Figure 1 This is an isometric schematic diagram of the ultra-high precision front door robot fender welding fixture described in this embodiment of the utility model;
[0018] Figure 2 This is a top view schematic diagram of the ultra-high precision front door robot fender welding fixture described in an embodiment of this utility model.
[0019] Figure 3 This is an isometric schematic diagram of the first clamping mechanism of the ultra-high precision front door robot fender welding fixture described in this embodiment of the utility model;
[0020] Figure 4 This is an isometric schematic diagram of the second clamping mechanism of the ultra-high precision front door robot fender welding fixture described in this embodiment of the utility model;
[0021] Figure 5 This is an isometric schematic diagram of the third clamping mechanism of the ultra-high precision front door robot fender welding fixture described in this embodiment of the utility model;
[0022] Figure 6 This is an isometric schematic diagram of the fourth clamping mechanism of the ultra-high precision front door robot fender welding fixture described in this embodiment of the utility model.
[0023] Explanation of reference numerals in the attached figures:
[0024] 1. Casters; 2. Caster connecting plate; 3. Mounting platform; 4. Fender; 5. Mudguard; 6. First clamping mechanism; 7. Second clamping mechanism; 8. Third clamping mechanism; 9. Fourth clamping mechanism; 10. Lifting lug; 11. Clamping mechanism fixing seat; 12. First mounting plate; 13. First L-shaped mounting block; 14. First positioning pin mounting seat; 15. First locking bolt; 16. Positioning pin; 17. First clamping mounting plate; 18. Locking handle; 19. First pad; 20. Second pad; 21. Rotating connecting plate; 2 2. Bending connecting plate; 23. Slanted connecting plate; 24. Short connecting plate; 25. Second mounting plate; 26. Second clamping mounting plate; 27. First fixing block; 28. Second fixing block; 29. Second positioning pin mounting seat; 30. Clamping connecting block; 31. Fourth clamping mounting plate; 32. Second L-shaped mounting block; 33. First pad block; 34. Third L-shaped mounting block; 35. Fourth L-shaped mounting block; 36. Third clamping mounting plate; 37. Second contact block; 38. Connecting fixing block; 39. First contact block; 40. Third mounting plate. Detailed Implementation
[0025] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model 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 utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0029] See Figures 1-6 As shown, this embodiment provides an ultra-high precision welding fixture for the fender of a front door robot, including a fender 4, a mudguard 5, and a fender clamping mechanism for fixing the fender. The fender clamping mechanism is bolted to the mounting platform 3. The fender 4 is connected to the clamping mudguard 5. The four corners of the mounting platform 3 are fixed with moving wheel connecting plates 2, which are connected to moving wheels 1. The four corners of the upper surface of the mounting platform 3 are locked with lifting lugs 10. The fender clamping mechanism includes a first clamping mechanism 6, a second clamping mechanism 7, a third clamping mechanism 8, and a fourth clamping mechanism 9. Each fender clamping mechanism is provided with a clamping mechanism fixing seat 11. The clamping mechanism fixing seat 11 is provided with a reinforcing rib in the middle. The clamping mechanism fixing seat 11 is installed on the upper surface of the mounting platform 3.
[0030] Specifically, in this embodiment, the first clamping mechanism 6 is located at the edge of the fender 4. The first mounting plate 12 is locked onto the vertical mounting plate of the clamping mechanism fixing seat 11. Several first pads 19 are locked onto the upper surface of the first mounting plate 12. A first L-shaped mounting block 13 is fixed to the front of the first mounting plate 12. A first positioning pin mounting seat 14 is fixed to the side of the first L-shaped mounting block 13. The first positioning pin mounting seat 14 fixes the positioning pin 16 by the first locking bolt 15. The positioning pin 16 is fixed to the groove at the edge of the fender 4. The upper end of the first mounting plate 12 is provided with a protrusion. Both the front and rear surfaces of the protrusion are provided with rotating connecting plates 21 that are locked by bolts. The two rotating connecting plates 21 are connected by a first locking bolt 15. A connecting shaft is connected to the inclined connecting plate 23. The other end of the inclined connecting plate 23 is connected to the first clamping mounting plate 17 via the connecting shaft. The lower end face of the first clamping mounting plate 17 is connected to the second pad 20. The rotating connecting plate 21 is provided with a groove. A second connecting shaft is provided directly below the groove and is connected to the bent connecting plate 22. The vertical connecting section at the lower part of the bent connecting plate 22 passes through the second connecting shaft. The bent part of the bent connecting plate 22 is connected to another symmetrically arranged bent connecting plate 22 and a short connecting plate 24 via a third connecting shaft. The other end of the short connecting plate 24 is connected to the middle part of the inclined connecting plate 23. A fourth connecting shaft is connected to the bent connecting section at the upper part of the bent connecting plate 22. The fourth connecting shaft is connected to the locking handle 18.
[0031] Specifically, in this embodiment, the second clamping mechanism 7 is adjacent to the first clamping mechanism 6. The second mounting plate 25 is locked on the vertical mounting plate of the clamping mechanism fixing seat 11. The upper end face of the second mounting plate 25 is locked with the first L-shaped mounting block 13. The first pad 19 is locked on the first L-shaped mounting block 13. The second mounting plate 25 has a protrusion. Both the front and rear surfaces of the protrusion are provided with rotating connecting plates 21 that are locked with bolts. The two rotating connecting plates 21 are connected to the inclined connecting plate 23 through the first connecting shaft. The other end of the inclined connecting plate 23 is connected to the second clamping mounting plate 26 through the connecting shaft. The second clamping mounting plate 26 and the second mounting plate 25 are connected through the clamping connecting block 30. The side of the second clamping mounting plate 26 is connected to the first fixing block 27 and the top is connected to the second fixing block 28. The second fixing block 28 is installed with the second positioning pin. The seat 29 is locked, and the positioning pin 16 is fixed on the second positioning pin mounting seat 29. The positioning pin 16 is fixed to the slot on the fender 4. The first L-shaped mounting block 13 is fixed on the second mounting plate 25. Several first pads 19 are locked on the first L-shaped mounting block 13. The first pads 19 are adapted to the shape of the fender 4. The rotating connecting plate 21 is provided with a groove. The second connecting shaft is provided directly below the groove and connected to the bent connecting plate 22. The second connecting shaft passes through the vertical connecting section at the bottom of the bent connecting plate 22. The bent part of the bent connecting plate 22 is connected to another symmetrically arranged bent connecting plate 22 and short connecting plate 24 through the third connecting shaft. The other end of the short connecting plate 24 is connected to the middle of the inclined connecting plate 23. The fourth connecting shaft is connected to the bent connecting section at the top of the bent connecting plate 22. The fourth connecting shaft is connected to the locking handle 18.
[0032] Specifically, in this embodiment, the third clamping mechanism 8 is located at the connection between the fender 4 and the mudguard 5. The third mounting plate 40 is locked onto the vertical mounting plate of the clamping mechanism fixing seat 11. The upper end of the third mounting plate 40 has a protrusion, and both the front and rear surfaces of the protrusion are provided with rotating connecting plates 21 that are locked by bolts. The two rotating connecting plates 21 are connected to the inclined connecting plate 23 through a first connecting shaft. The other end of the inclined connecting plate 23 is connected to the third clamping mounting plate 36 through a connecting shaft. The third clamping mounting plate 36 is F-shaped. Plate 36 is connected to the third mounting plate 40 via clamping connecting block 30. The third clamping mounting plate 36 is connected to the connecting fixing block 39 via a connecting block. The connecting fixing block 39 is locked to the first contact block 38. The surface of the first contact block 38 at the contact point with the fender 4 is adapted to its contact surface. Two horizontally extending connecting sections on the third clamping mounting plate 36 are connected to the second contact block 37. Several gaskets are provided between the third clamping mounting plate 36 and the second contact block 37. Several gaskets are provided between the connecting fixing block 39 and the first contact block 38.
[0033] Specifically, in this embodiment, the fourth clamping mechanism 9 is located on the opposite side between the second clamping mechanism 7 and the third clamping mechanism 8. The second mounting plate 25 is locked on the vertical mounting plate of the clamping mechanism fixing seat 11, and the upper end face of the second mounting plate 25 is locked with 13. The first pad 19 is locked on the first L-shaped mounting block 13. The second mounting plate 25 has a protrusion, and both the front and rear surfaces of the protrusion are provided with rotating connecting plates 21 locked by bolts. The two rotating connecting plates 21 are connected to the inclined connecting plate 23 through a first connecting shaft. The other end of the inclined connecting plate 23 is connected to the fourth clamping mounting plate 31 through a connecting shaft. The fourth clamping mounting plate 31 is connected to the second mounting plate 25 through a clamping connecting block 30. The side of the fourth clamping mounting plate 31 is connected to the second L-shaped mounting block 32 and the third L-shaped mounting block 33. Mounting block 34, fourth L-shaped mounting block 35, the bottom of third L-shaped mounting block 34 and fourth L-shaped mounting block 35 are adapted to the upper surface of fender 4. The first pad 33 is connected to the second mounting plate 25. The first pad 33 is adapted to the upward bending side of the fender 4. The rotating connecting plate 21 is provided with a groove. The second connecting shaft is provided directly below the groove and connected to the bending connecting plate 22. The vertical connecting section at the bottom of the bending connecting plate 22 passes through the second connecting shaft. The bending part of the bending connecting plate 22 is connected to another symmetrically arranged bending connecting plate 22 and short connecting plate 24 through the third connecting shaft. The other end of the short connecting plate 24 is connected to the middle of the inclined connecting plate 23. The bending connecting section at the top of the bending connecting plate 22 is connected to the fourth connecting shaft. The fourth connecting shaft is connected to the locking handle 18.
[0034] Specifically, in this embodiment, both the first pad 19 and the second pad 20 are made of rubber.
[0035] The fender clamping mechanism can firmly clamp the fender from multiple positions according to the fender's contour and welding requirements, ensuring the relative positional accuracy between the fender and the mudguard, thereby improving the accuracy of welding, ensuring that the connection between the two after welding meets high precision requirements, and enhancing the overall flatness and aesthetics of the car's appearance.
[0036] The first, second, third, and fourth clamping mechanisms clamp the fender from different angles and positions, ensuring uniform clamping force during welding and effectively preventing deformation due to uneven localized stress. Different clamping mechanisms can precisely position and clamp different parts of the fender; for example, some mechanisms fix the fender's edges, while others position key connection points, thus comprehensively ensuring the fender's positional accuracy during welding, improving welding quality, and meeting the requirements of ultra-high precision welding.
[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A high-precision welding fixture for the fender of a front door robot, characterized in that, The system includes a fender (4), a mudguard (5), and a fender clamping mechanism for fixing the fender. The fender clamping mechanism is bolted to the mounting platform (3). The fender (4) is connected to the clamping mudguard (5). The four corners of the mounting platform (3) are fixed with moving wheel connecting plates (2). The moving wheel connecting plates (2) are connected to the moving wheels (1). The four corners of the upper surface of the mounting platform (3) are locked with lifting lugs (10). The fender clamping mechanism includes a first clamping mechanism (6), a second clamping mechanism (7), a third clamping mechanism (8), and a fourth clamping mechanism (9). Each fender clamping mechanism is provided with a clamping mechanism fixing seat (11). The clamping mechanism fixing seat (11) is provided with a reinforcing rib in the middle. The clamping mechanism fixing seat (11) is installed on the upper surface of the mounting platform (3).
2. The ultra-high precision front door robot fender welding fixture according to claim 1, characterized in that, The first clamping mechanism (6) is located at the edge of the fender (4). The first mounting plate (12) is locked on the vertical mounting plate of the clamping mechanism fixing seat (11). Several first pads (19) are locked on the upper surface of the first mounting plate (12). The first L-shaped mounting block (13) is fixed in front of the first mounting plate (12). The first positioning pin mounting seat (14) is fixed on the side of the first L-shaped mounting block (13). The first positioning pin mounting seat (14) is fixed to the positioning pin (16) by the first locking bolt (15). The positioning pin (16) is fixed to the groove at the edge of the fender (4). The upper end of the first mounting plate (12) is provided with a protrusion. The front and rear surfaces of the protrusion are provided with rotating connecting plates (21) locked by bolts. The two rotating connecting plates (21) are connected by a first connecting shaft. The oblique connecting plate (23) is connected to the first clamping mounting plate (17) via a connecting shaft. The lower end of the first clamping mounting plate (17) is connected to the second pad (20). The rotating connecting plate (21) is provided with a groove. The second connecting shaft is provided directly below the groove and connected to the bending connecting plate (22). The vertical connecting section at the lower part of the bending connecting plate (22) passes through the second connecting shaft. The bending part of the bending connecting plate (22) is connected to another symmetrically arranged bending connecting plate (22) and a short connecting plate (24) via a third connecting shaft. The other end of the short connecting plate (24) is connected to the middle part of the oblique connecting plate (23). The bending connecting section at the upper part of the bending connecting plate (22) is connected to a fourth connecting shaft. The fourth connecting shaft is connected to the locking handle (18).
3. The ultra-high precision front door robot fender welding fixture according to claim 1, characterized in that, The second clamping mechanism (7) is adjacent to the first clamping mechanism (6). The second mounting plate (25) is locked on the vertical mounting plate of the clamping mechanism fixing seat (11). The upper end face of the second mounting plate (25) is locked with the first L-shaped mounting block (13). The first pad (19) is locked on the first L-shaped mounting block (13). The second mounting plate (25) is provided with a protrusion. The front and rear surfaces of the protrusion are provided with a rotating connecting plate (21) locked by bolts. The two rotating connecting plates (21) are connected to the inclined connecting plate (23) through the first connecting shaft. The other end of the inclined connecting plate (23) is connected to the second clamping mounting plate (26) through the connecting shaft. The second clamping mounting plate (26) and the second mounting plate (25) are connected by the clamping connecting block (30). The side of the second clamping mounting plate (26) is connected to the first fixing block (27), and the top is connected to the second fixing block (28). The second fixing block (28) is locked with the second positioning pin mounting seat (29). The second positioning pin mounting seat (29) is fixed with a positioning pin (16), which is fixed to the slot on the fender (4). The second mounting plate (25) is fixed with a first L-shaped mounting block (13), and a number of first pads (19) are locked on the first L-shaped mounting block (13). The first pads (19) are adapted to the shape of the fender (4). The rotating connecting plate (21) is provided with a groove. The second connecting shaft is provided directly below the groove and connected to the bent connecting plate (22). The vertical connecting section at the bottom of the bent connecting plate (22) passes through the second connecting shaft. The bent part of the bent connecting plate (22) is connected to another symmetrically arranged bent connecting plate (22) and a short connecting plate (24) through a third connecting shaft. The other end of the short connecting plate (24) is connected to the middle of the inclined connecting plate (23). The bent connecting section at the top of the bent connecting plate (22) is connected to a fourth connecting shaft, which is connected to the locking handle (18).
4. The ultra-high precision front door robot fender welding fixture according to claim 1, characterized in that, The third clamping mechanism (8) is located at the connection between the fender (4) and the mudguard (5). The third mounting plate (40) is locked onto the vertical mounting plate of the clamping mechanism fixing seat (11). The upper end of the third mounting plate (40) is provided with a protrusion. Both the front and rear surfaces of the protrusion are provided with rotating connecting plates (21) locked by bolts. The two rotating connecting plates (21) are connected to the inclined connecting plate (23) through the first connecting shaft. The other end of the inclined connecting plate (23) is connected to the third clamping mounting plate (36) through the connecting shaft. The third clamping mounting plate (36) is F-shaped. The third clamping mounting plate (36) and the third mounting plate (5) are connected to the third mounting plate (40). The mounting plate (40) is connected by the clamping connecting block (30). The third clamping mounting plate (36) is connected to the connecting fixing block (39) by the connecting block. The connecting fixing block (39) is locked to the first contact block (38). The surface of the first contact block (38) at the junction with the fender (4) is adapted to its contact surface. Two horizontally extending connecting segments on the third clamping mounting plate (36) are connected to the second contact block (37). Several gaskets are provided between the third clamping mounting plate (36) and the second contact block (37). Several gaskets are provided between the connecting fixing block (39) and the first contact block (38).
5. The ultra-high precision front door robot fender welding fixture according to claim 1, characterized in that, The fourth clamping mechanism (9) is located on the opposite side between the second clamping mechanism (7) and the third clamping mechanism (8). The second mounting plate (25) is locked on the vertical mounting plate of the clamping mechanism fixing seat (11). The upper end face of the second mounting plate (25) is locked with the first L-shaped mounting block (13). The first pad (19) is locked on the first L-shaped mounting block (13). The second mounting plate (25) is provided with a protrusion. Both the front and rear surfaces of the protrusion are provided with a rotating connecting plate (21) locked by bolts. The two rotating connecting plates (21) are connected to the inclined connecting plate (23) through the first connecting shaft. The other end of the inclined connecting plate (23) is connected to the fourth clamping mounting plate (31) through the connecting shaft. The fourth clamping mounting plate (31) is connected to the second mounting plate (25) through the clamping connecting block (30). The side of the fourth clamping mounting plate (31) is connected to the second L-shaped mounting block (32) and the third L-shaped mounting block (34). The fourth L-shaped mounting block (35) is adapted to the upper surface of the fender (4) by the bottom of the third L-shaped mounting block (34) and the fourth L-shaped mounting block (35). The second mounting plate (25) is connected to the first pad (33). The first pad (33) is adapted to the side of the fender (4) that is bent upward. The rotating connecting plate (21) is provided with a groove. The second connecting shaft is provided directly below the groove and connected to the bent connecting plate (22). The vertical connecting section at the bottom of the bent connecting plate (22) passes through the second connecting shaft. The bent part of the bent connecting plate (22) is connected to another symmetrically arranged bent connecting plate (22) and a short connecting plate (24) through the third connecting shaft. The other end of the short connecting plate (24) is connected to the middle part of the inclined connecting plate (23). The bent connecting section at the top of the bent connecting plate (22) is connected to the fourth connecting shaft. The fourth connecting shaft is connected to the locking handle (18).
6. The ultra-high precision welding fixture for the front door robot fender according to any one of claims 1-5, characterized in that, Both the first pad (19) and the second pad (20) are made of rubber.